JB/T 3076-1999 Lead-acid battery tank

This standard specifies the definition and abbreviations, product classification, requirements, determination methods, inspection rules, marking, packaging, transportation, storage, etc. of lead-acid battery tanks. This standard applies to lead-acid battery tanks JB/T 3076-1999 Lead-acid battery tanks JB/T3076-1999 Standard download decompression password: www.bzxz.net

JB/T3076-1999
This standard is a revision of JB3076-91 "Lead-acid Battery Container". During the revision process, the Japanese standard JIS C2335-1991 "Battery Container for Lead-acid Batteries" was referenced, and the technical content is not equivalent. The format and rules of this standard are all based on GB/T1.1-1993 "Guidelines for Standardization Work Unit 1: Rules for Drafting and Presentation of Standards Part 1: Basic Regulations for Standard Writing" to ensure the uniformity of standard writing and to be suitable for international exchanges. Compared with JB3076-91 "Lead-acid Battery Container", this standard has the following changes: adding a preface;
--Chapter and section clauses are rearranged according to the content. From the date of implementation, this standard will replace JB3076-91 at the same time. This standard is proposed and managed by the National Lead-acid Battery Standardization Technical Committee. This standard was drafted by the Shenyang Battery Research Institute, and Beijing Xio Power Products Co., Ltd. and Zhongshan Yongguan Plastic Electric Products Co., Ltd. participated in the drafting.
The main drafters of this standard are Xie Shuang, Sun Xueli, Sheng Lin, Cui Shihu and Hu Zhaolin. This standard was first issued in 1982, revised for the first time in 1991 and revised for the second time in 1998. 1 Scope
Machinery Industry Standard of the People's Republic of China
Lead-acid Battery Container
ContainerforleadacidstoragebatteriesJB/T3076-—1999
Replaces JB3076-91
This standard specifies the definition and abbreviations, product classification, requirements, determination methods, inspection rules, marking, packaging, transportation and storage of lead-acid battery containers.
This standard applies to lead-acid battery containers.
2 Referenced Standards
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. At the time of publication of the standard, the versions shown are all valid. All standards are subject to revision. Parties using this standard should explore the possibility of using the latest version of the following standards. GB/T 625--1989
GB/T631—1989
GB/T643—1988
GB/T661-—1992
GB/T693—1985
GB/T1250—1989
GB1254-1990
GB/T1293—1989||t t||GB/T1401—1985
GB/T2918--1982
Chemical reagents
Chemical reagents
Chemical reagents
Chemical reagents
Chemical reagents
Potassium permanganate
Ammonium iron (II) sulfate hexahydrate (ammonium ferrous sulfate) sodium acetate
Expression and determination methods of limits
Working reference reagent (capacity) Sodium oxalate
Chemical reagent 1,10-phenoxy
Disodium ethylenediaminetetraacetic acid
Chemical reagent
Standard environment for plastic specimen state adjustment and testing GB/T5008.2—1991
Product varieties and specifications of lead-acid batteries for starting GB/T6684—1986
GB/T6685—1986
GB/T6766—1993
Chemical reagent 30% hydrogen peroxide
Chemical reagent Hydroxylamine chloride (Hydroxylamine hydrochloride) Rubber and plastic parts for lead-acid batteries Dimension tolerances GB/T7403.2—1987
Lead-acid batteries for traction
GB/T7404—1987
GB/T 8170—1987
GB10978.2-—1989
GB/T13281--1991
Lead-acid batteries for diesel locomotives
Rules for numerical rounding off
Lead-acid batteries for explosion-proof devices in coal mines
Lead-acid batteries for railway passenger cars
GB/T13337.2-1991Capacity specifications and dimensions of fixed acid-proof lead-acid batteriesGB/T14436—1993
JB/T1866--1999
JB/T2599—1993
JB/T4282—1992
JB/T6457.1-1992
J B/T8451—1996
Industrial product guarantee documents
Lead-acid batteries for navigation
Method for compiling lead-acid battery product models
Lead-acid batteries for motorcycles
Product classification of small valve-controlled sealed lead-acid batteries Fixed valve-controlled sealed lead-acid batteries
Approved by the State Bureau of Machinery Industry on August 6, 1999 10
Implemented on January 1, 2000
3 Definitions and abbreviations
3.1 Definitions
This standard adopts the following definitions
3.1.1 Withstand voltage
JB/T3076—1999
The ability of a lead-acid battery tank to withstand an additional voltage within a specified time. 3.1.2 Impact resistance
The ability of a lead-acid battery tank to withstand the impact of a steel ball of a certain mass at a certain temperature. 3.1.3 Heat resistance
The change in the size of a lead-acid battery tank after a certain temperature change. 3.1.4 Corrosion resistance
The ability of a lead-acid battery tank to withstand corrosion by sulfuric acid solution at a certain temperature and time, including swelling, cracking, discoloration, etc. 3.1.5 Air pressure resistance
The change in the size of a lead-acid battery tank under the action of a certain pressure of gas. 3.1.6 Monomer lead-acid battery tank
A lead-acid battery tank with only one cell. 3.1.7 Monolithic lead-acid battery tank
A lead-acid battery tank with more than one cell. 3.2 Abbreviations
The abbreviations used in this standard are shown in Table 1.
Lead-acid battery
Lead-acid battery tank
Hard rubber lead-acid battery tank
Synthetic resin lead-acid battery tank
Single lead-acid battery tank
Integral lead-acid battery tank
Product classification
Battery tanks are divided into integral tanks and single tanks according to their structure. Abbreviations
Battery tanks are classified according to their structure, material, main use and specifications and dimensions as shown in Table 2. Omitted
Battery
Battery slot
Rubber slot
Plastic slot
Single slot
Integral slot
Integral slot
Single slot
Classification name
Rubber slot and plastic slot
Rubber slot and plastic slot
JB/T3076—1999
Table 2 Battery slot classification
Main purpose
Starting|| tt||For motorcycles
For railway passenger cars
For diesel locomotives
For navigation marks
Small valve-controlled sealed type
Fixed valve-controlled sealed type
For railway passenger cars
For traction
For diesel locomotives
For coal mine explosion-proof devices
Fixed acid-proof type
Fixed valve-controlled sealed type
The dimensions of the battery tank should comply with the relevant standards and drawings. The surface color of the rubber tank is uniform, the appearance is neat, and there is no frost, bursting, bubbles or cracks. The surface color of the plastic tank is uniform, the appearance is neat, and there is no decomposition mark or scratch. The physical and chemical properties of the battery tank are shown in Table 3.
Physical and chemical properties
Withstand voltage
Impact resistance
Heat resistance
Dry method, V
Wet method, V
Overall slot, mm
Single slot
Internal stress
Air pressure resistance
Corrosion resistance
Mass change rate
Iron content
Reduced potassium permanganate substance, ml/g
According to GB/T5008.2||tt ||According to JB/T4282
According to GB/T13281
According to GB/T7404
According to JB/T1866
According to JB/T6457.1
According to JB/T8151
According to GB/T13281
According to GB/T7403.2
According to GB/T7404
According to GB10978.2
According to GB/T13337.2
According to JB/T8451
See Table 4 for details
See Table 4 for details
No cracks
No cracks
No cracks
Small valve-controlled sealed type
Fixed valve-controlled sealed type
No expansion, cracks, discoloration
≤0.005%
Fixed acid-proof and fixed valve-controlled sealed battery tanks do not control low-temperature drop ball impact strength. 2 Battery tanks made of non-crystalline polymers such as styrene and its copolymers control internal stress. 12
5.5 The storage period of the battery tank is two years.
6 Determination method
6.1 Sampling
6.1.1 Sampling conditions
JB/T3076--1999
The product must be placed in the production site, use site or warehouse at room temperature. 6.1.2 Sampling method
Sampling adopts random sampling method. The sample unit is shown in Table 7. 6.1.3 Sample preservation method
The randomly selected samples must be placed in the standard environment specified in GB/T2918 and covered to prevent dust accumulation, mechanical damage, etc. 6.2 Sample state adjustment and standard environment
The sample must be adjusted in the standard environment specified in GB/T2918 for at least 48 hours. The test environment shall be implemented in accordance with the GB/T2918 regulations unless otherwise specified.
6.3 Appearance inspection
6.3.1 Inspection steps
In a brightly lit room, visually inspect the battery tank for defects such as dirt, bubbles, decomposition marks, cracks and scratches. 6.3.2 Result determination
a) The battery tank should be free of cracks, otherwise this item is unqualified; b) Except for a), if the number of battery tanks with the above-mentioned other defects exceeds 2% of the total number, this item is unqualified. 6.4 Determination of external dimensions
6.4.1 Measuring tool
One ruler: graduation value 0.05mm.
6.4.2 Determination steps
Take five samples, place the samples flat on a flat table, and use a ruler to measure the height of the samples; the length and width of the center of the sample notch and the center of the sample; the length and width of the middle grid and the diagonal length of the sample. 6.4.3 Result determination
Each sample shall meet the requirements of the standard or drawing, otherwise, double sampling shall be conducted for re-determination. If there are still samples that fail to meet the requirements, the item shall be deemed unqualified. 6.5 Determination of withstand voltage
6.5.1 Principle
Under the action of a certain DC voltage, if the battery tank is defective or the material itself has low resistance, it will be broken down. Whether the battery tank is broken down when subjected to a certain DC voltage indicates its withstand voltage. 6.5.2 Dry method determination
Measured by a small high-voltage electric spark.
6.5.2.1 Instruments
One voltage regulating transformer: range 0~250V; capacity 2kVA; one AC ammeter: accuracy level 1.5, range 0~10A; one AC voltmeter: accuracy level 1.5, range 0250V; one neon lamp transformer: range 0~15000V. 6.5.2.2 Working principle diagram
The working principle diagram is shown in Figure 1.
JB/T3076-1999
1-switch; 2-manual button; 3-pedal button; 4-indicator light; 5-voltage regulating transformer; 6-AC ammeter; 7-AC voltmeter; 8-neon lamp transformer, 9-battery slot
Figure 1 Working principle diagram of dry method test
6.5.2.3 Test steps
Take three samples and insert them into the iron core with a short wire of 10-15cm in the middle. The upper edge of the core is 20±5mm away from the edge of the sample notch. Then put the sample with the iron core into the metal slot. The height of the metal slot should be consistent with that of the iron core. Input 1.8A current. Input voltage to the iron cores on both sides of the middle according to Table 4. Keep it for 3s and observe the voltage of the voltmeter. Connect one end of a wire to the metal slot and the other end to the iron core, re-input the voltage according to Table 4, keep it for 3s, and observe the voltage on the voltmeter. Table 4 Input voltage
Starting
Motorcycle
Navigation mark
Small valve-controlled sealed type
Railway passenger car
Diesel locomotive
Traction
Coal mine explosion-proof device
Miner's lamp
Fixed acid-proof type
Fixed valve-controlled sealed type
Various specifications
Various specifications||t t||Various specifications
Various specifications
Various specifications
Various specifications
Various specifications
Various specifications
Various specifications
<1000Ah
≥1000Ah
Voltage, V
Note: Dry method: wet method can be selected, and the results obtained are equally valid, but in case of dispute, the wet method shall prevail. 6.5.3 Wet method determination
6.5.3.1 Measured with a tip discharge induction coil. 6.5.3.1.1 Instrument
Step-up transformer: range 12V/0V~15000V; -Voltmeter: accuracy level 1.5, range 0~15000V. 6.5.3.1.2 Working principle diagram
The working principle diagram is shown in Figure 2.
6.5.3.1.3 Test steps
JB/T3076—1999
1-switch; 2-power supply; 3-vibrator; 4-step-up transformer; 5-voltmeter; 6-metal needle; 7-test rod; 8-battery slot Figure 2 Working principle of tip discharge induction coil test Take three samples, use water as the medium, and pour water into the samples. The water surface is 20±5mm away from the sample notch. The water surface inside and outside the sample should be equal. Adjust the distance between the discharge metal needles so that the voltage reaches the requirements specified in Table 4. First test the outer wall of the sample, put one end of the test rod in the water tank, and put the other end into the single slot sample or each middle grid of the integral slot sample, input voltage, keep it for 3S, and observe the sparks between the metal needles. 6.5.3.2 Determination with a test transformer
6.5.3.2.1 Device
Use a test transformer with a maximum rated voltage of not less than 15kV and a capacity of not less than 2kVA for high voltage inspection. The test principle is basically the same as the dry method.
6.5.3.2.2 Test steps
Take three samples, use water as the medium, and inject water into the sample. The water surface is 30±5mm away from the sample notch. The water surface inside and outside the sample should be equal, and the water surface of each middle grid should be equal. Use the water inside and outside the sample as the electrode, control the input current to 10±1A, and input the voltage as specified in Table 4, and maintain it for 3s. 6.5.4 Result determination
If the voltage of the voltmeter is stable or there is a spark between the metal needles, the tested part is not broken down; if the voltage drops sharply or there is no spark between the metal needles, the tested part is broken down.
If one of the three samples is unqualified, double sampling is required for re-testing. If there are still unqualified samples, the item is unqualified. 6.6 Determination of impact resistance
6.6.1 Principle
When a battery container is subjected to a certain external force impact, if it is defective or the material itself is not impact-resistant, cracks or breaks will appear. After a battery container has been subjected to a certain temperature for a certain period of time, it is subjected to a certain mass of steel ball impact. Whether cracks appear indicates its impact resistance. 6.6.2 Instruments and devices
—Steel ball: 500g;
-Freezer;
-Testing device (see Figure 3).
6.6.3 Determination of falling ball impact at room temperature
6.6.3.1 Test steps
JB/T3076-1999
Put three samples flat on an iron plate with a thickness of about 25mm and a length and width at least 25mm larger than the maximum dimension of the sample. The impact point of the integral slot sample is located within the 20mm diameter of the center of the side parallel to the plate. The impact point of the single slot sample is located within the 20mm diameter of the center of the four walls, and the impact surface should be kept horizontal. According to the height specified in Table 5, make the steel ball impact the sample in free fall motion, and check whether the sample has cracks. The steel ball should impact the sample only once to prevent backlash. 6.6.3.2 Result determination
a) Determine whether the sample is damaged by the sound of knocking the sample and visual inspection. If there is a tearing sound, treat it as a crack. b) Test according to the details given in 6.5. If there is a breakdown phenomenon, treat it as a crack. c) When it cannot be determined according to 6.6.3.2a or there is a dispute, 6.6.3.2b can be used to determine. d) If one of the three samples is unqualified, double sampling is required for re-testing. If there are still unqualified samples, the batch of products is unqualified. 3
1-steel ball; 2-electromagnet; 3-switch; 4-ruler; 5-battery slot fastening frame; 6-support plate Figure 3 Schematic diagram of the drop ball impact test device
6.6.4 Determination of low temperature drop ball impact
6.6.4.1 Test steps
Take three samples and place them in a 30℃ freezer for 3 hours, then take the samples out of the freezer and test them within 1 minute according to 6.6.3.1.
6.6.4.2 Result determination
According to 6.6.3.2.
Starting
Motorcycle
Navigation mark
Small valve-controlled sealed type
Railway passenger car
Internal diesel locomotive
Traction
Coal mine explosion-proof device
Mining lamp
Fixed acid-proof type
Fixed valve-controlled sealed type
6. 7 Determination of internal stress
6.7.1 Principle
JB/T3076—1999
Various specifications
Various specifications
Various specifications
Various specifications
Various specifications
Various specifications
Various specifications
≤100Ah
100~1000Ah
>1000Ah
Ball drop height
Fall height, mm
Plastic tanks made of non-crystalline polymers will produce cracks at the parts of the bottle where the stress is concentrated. Whether cracks appear after the plastic tank is exposed to non-polar solvents for a certain period of time indicates whether its internal stress is qualified. 6.7.2 Test steps
Pour carbon tetrachloride into three samples respectively, shake for 5 minutes to completely soak the four walls of the samples, then immediately pour out the carbon tetrachloride and rub the samples, observe whether the samples have cracks after 5 minutes. 6.7.3 Result determination
According to 6.6.3.2.
6.8 Determination of heat resistance
6.8.1 Principle
The battery tank is kept at a certain temperature for a certain period of time, cooled to room temperature, and the external dimensions change. The change in the external dimensions of the battery tank indicates its heat resistance.
6.8.2 Instruments and devices
Ruler: Graduation value 0.05mm;
-Constant temperature box.
6.8.3 Test steps
Take three samples, measure the length and width of the center of the sample notch and the center of the sample with a ruler and record them, mark the measuring points, and pour water into the sample at the temperature specified in Table 6, with the water surface 20±2mm away from the notch; put the sample in a constant temperature box at the temperature specified in Table 6 and keep it for 3; cut off the power supply, open the door of the constant temperature box and cool it for at least 24h (to room temperature), pour out the water in the tank, and immediately measure the length and width of the sample at the same position with a ruler and record them.
Table 6 Hundred
Heat resistance test conditions
Integral tank
Single tank
Result calculation and judgment
Temperature, ℃
Constant temperature overflow.℃
Constant temperature time, h
6.8.4.1 Integral tank
The heat resistance of the integral tank is calculated according to formula (1) and formula (2): Where: △L---change in length of the sample, mm; L
--length of the sample before heating, mm;
L2---length of the sample after heating, mm;
△W---change in width of the sample, mm;
W,--width of the sample before heating, mm;
width of the sample after heating, mm.
6.8.4.2 Single groove
JB/T3076—1999
AW=Wz-W1
The heat resistance of single groove is calculated according to formula (3) and formula (4): Lz-Li×100% ·
Wp-change rate of sample length, %; L
length of sample before heating, mm;
length of sample after heating, mm;
Wp-change rate of sample width, %;
W,-width of sample before heating, mm;
width of sample after heating, mm.
×100%
The calculation result is rounded to two significant figures, and the one with the largest absolute value among the three samples is the measured value. (1)
Both the length and width should be qualified. If they are unqualified, double sampling is required for re-measurement. If there are still unqualified samples, the item is unqualified. 6.9 Determination of air pressure resistance
6.9.1 Principle
After a certain pressure of gas is passed into the valve-controlled sealed battery tank, a certain deformation will occur due to expansion. The size of the deformation under a certain pressure is used to indicate the air pressure resistance of the tank.
6.9.2 Instruments and devices
A barometer; accuracy: 2.5 level, range 0~0.2MPa; U-type pressure gauge; accuracy: 1.5 level, range 0~0.1MPa. A safety cover;
A gas compressor.
6.9.3 Test steps
a) Take three samples and seal their lids (the whole slot is only sealed around the edges, not the middle interval); then seal the leaking parts such as the pole and safety valve; drill a hole with a diameter of 8 to 10 mm near the center of the side of the sealed sample and glue a glass tube (no leakage at the bonding point); b) Put the prepared sample into the safety cover, use a 0.15MPa gas source, when the pressure in the slot reaches 50kPa, keep it for 5 minutes, and measure the length and width within 20mm of the center of the outer wall of the sample; c) The length and width of the sample before the gas is passed are calculated as the minimum value, and the length and width of the sample after the gas is passed are calculated as the maximum value. 6.9.4 Result calculation and judgment
The gas pressure resistance in the length direction is calculated according to formula (5):
The gas pressure resistance in the width direction is calculated according to formula (6):
Where: L. The change rate of the sample in length direction, %; L---the length of the sample before pressurization, mm;
L2--the length of the sample after pressurization, mm;
W. The change rate of the sample in width direction, %;
W, the width of the sample before pressurization, mm;
Wz--the width of the sample after pressurization, mm;
JB/T3076-1999
The calculated result is rounded to two significant figures, and the maximum change rate among the three samples is the measured value. (6)
Both the length and width directions should be qualified. If they are unqualified, double sampling is required for re-measurement. If there are still unqualified samples, the item is unqualified. 6.10 Determination of mass change rate
6.10.1 Principle
After the sample is immersed in sulfuric acid solution at a certain temperature for a certain period of time, its mass changes due to erosion, and it is expressed as the percentage of mass change after acid immersion.
6.10.2 Reagents
Sulfuric acid (GB/T625): analytical grade, density 1.280±0.005g/cm* solution. 6.10.3 Preparation of samples
Samples are taken from the side of the single cell and from the middle partition of the integral cell, or standard samples are prepared using the same raw materials as the battery cell. The sample is 100mm long and 25mm wide. The thickness is based on the thickness of the battery cell wall and the thickness of the middle partition of the battery cell. The standard sample thickness is 3-5mm. The sample surface must be smooth and clean, and the surface layer and other substances that resist medium erosion must be removed. 6.10.4 Determination steps
Take five samples and weigh their total mass (accurate to 0.0001g) and place them in a ground-mouth wide-mouth bottle. Use a glass rod to separate the samples. Accurately add 500ml of sulfuric acid solution with a density of 1.280±0.005g/cm\ (25℃) to completely immerse the samples in the sulfuric acid solution. Cover the bottle with a lid and place it in a constant temperature box at a temperature of 60±2℃ for 168h. Then take out the bottle and cool it to room temperature. Take out the sample and test the potassium permanganate reduction substance and iron content in the acid solution. Rinse the acid-soaked sample with tap water until it is neutral (check with pH test paper), then wash with distilled water, wipe it dry with filter paper, let it stand for 1min, and then weigh the mass (accurate to 0.0001g). 6.10.5 Calculation and determination of results
The mass change rate is calculated according to formula (7):
m2=ml×100%.
Wherein: mp—mass change rate, %;
m1—mass of the sample before acid immersion, g;
m2—mass of the sample after acid immersion, g.
The calculation result is rounded to two significant figures. A positive result indicates an increase in mass, and a negative result indicates a decrease in mass. The absolute value of the calculation result should be qualified. Otherwise, the sample should be doubled and re-measured. If the result is still unqualified, the item is unqualified. 6.11 Determination of corrosion resistance
6.11.1 Principle
After the sample is immersed in a sulfuric acid solution at a certain temperature for a certain period of time, its appearance may change due to corrosion. Whether the appearance of the sample changes after acid immersion indicates corrosion resistance. 6.11.2 Test steps
After the mass change rate is determined, immediately visually test the apparent changes of the sample in a brightly lit room. 6.11.3 Result determination2.
For starting
For motorcycle
For navigation mark
For small valve-controlled sealed type
For railway passenger car
For internal combustion locomotive
For traction
For coal mine explosion-proof device
For mining lamp
Fixed acid-proof type
Fixed valve-controlled sealed type
6. 7 Determination of internal stress
6.7.1 Principle
JB/T3076—1999
Various specifications
Various specifications
Various specifications
Various specifications
Various specifications
Various specifications
Various specifications
≤100Ah
100~1000Ah
>1000Ah
Ball drop height
Fall height, mm
Plastic tanks made of non-crystalline polymers will produce cracks at the parts of the bottle where the stress is concentrated. Whether cracks appear after the plastic tank is exposed to non-polar solvents for a certain period of time indicates whether its internal stress is qualified. 6.7.2 Test steps
Pour carbon tetrachloride into three samples respectively, shake for 5 minutes to completely soak the four walls of the samples, then immediately pour out the carbon tetrachloride and rub the samples, observe whether the samples have cracks after 5 minutes. 6.7.3 Result determination
According to 6.6.3.2.
6.8 Determination of heat resistance
6.8.1 Principle
The battery tank is kept at a certain temperature for a certain period of time, cooled to room temperature, and the external dimensions change. The change in the external dimensions of the battery tank indicates its heat resistance.
6.8.2 Instruments and devices
Ruler: Graduation value 0.05mm;
-Constant temperature box.
6.8.3 Test steps
Take three samples, measure the length and width of the center of the sample notch and the center of the sample with a ruler and record them, mark the measuring points, and pour water into the sample at the temperature specified in Table 6, with the water surface 20±2mm away from the notch; put the sample in a constant temperature box at the temperature specified in Table 6 and keep it for 3; cut off the power supply, open the door of the constant temperature box and cool it for at least 24h (to room temperature), pour out the water in the tank, and immediately measure the length and width of the sample at the same position with a ruler and record them.
Table 6 Hundred
Heat resistance test conditions
Integral tank
Single tank
Result calculation and judgment
Temperature, ℃
Constant temperature overflow.℃
Constant temperature time, h
6.8.4.1 Integral tank
The heat resistance of the integral tank is calculated according to formula (1) and formula (2): Where: △L---change in length of the sample, mm; L
--length of the sample before heating, mm;
L2---length of the sample after heating, mm;
△W---change in width of the sample, mm;
W,--width of the sample before heating, mm;
width of the sample after heating, mm.
6.8.4.2 Single groove
JB/T3076—1999
AW=Wz-W1
The heat resistance of single groove is calculated according to formula (3) and formula (4): Lz-Li×100% ·
Wp-change rate of sample length, %; L
length of sample before heating, mm;
length of sample after heating, mm;
Wp-change rate of sample width, %;
W,-width of sample before heating, mm;
width of sample after heating, mm.
×100%
The calculation result is rounded to two significant figures, and the one with the largest absolute value among the three samples is the measured value. (1)
Both the length and width should be qualified. If they are unqualified, double sampling is required for re-measurement. If there are still unqualified samples, the item is unqualified. 6.9 Determination of air pressure resistance
6.9.1 Principle
After a certain pressure of gas is passed into the valve-controlled sealed battery tank, a certain deformation will occur due to expansion. The size of the deformation under a certain pressure is used to indicate the air pressure resistance of the tank.
6.9.2 Instruments and devices
A barometer; accuracy: 2.5 level, range 0~0.2MPa; U-type pressure gauge; accuracy: 1.5 level, range 0~0.1MPa. A safety cover;
A gas compressor.
6.9.3 Test steps
a) Take three samples and seal their lids (the whole slot is only sealed around the edges, not the middle interval); then seal the leaking parts such as the pole and safety valve; drill a hole with a diameter of 8 to 10 mm near the center of the side of the sealed sample and glue a glass tube (no leakage at the bonding point); b) Put the prepared sample into the safety cover, use a 0.15MPa gas source, when the pressure in the slot reaches 50kPa, keep it for 5 minutes, and measure the length and width within 20mm of the center of the outer wall of the sample; c) The length and width of the sample before the gas is passed are calculated as the minimum value, and the length and width of the sample after the gas is passed are calculated as the maximum value. 6.9.4 Result calculation and judgment
The gas pressure resistance in the length direction is calculated according to formula (5):
The gas pressure resistance in the width direction is calculated according to formula (6):
Where: L. The change rate of the sample in length direction, %; L---the length of the sample before pressurization, mm;
L2--the length of the sample after pressurization, mm;
W. The change rate of the sample in width direction, %;
W, the width of the sample before pressurization, mm;
Wz--the width of the sample after pressurization, mm;
JB/T3076-1999
The calculated result is rounded to two significant figures, and the maximum change rate among the three samples is the measured value. (6)
Both the length and width directions should be qualified. If they are unqualified, double sampling is required for re-measurement. If there are still unqualified samples, the item is unqualified. 6.10 Determination of mass change rate
6.10.1 Principle
After the sample is immersed in sulfuric acid solution at a certain temperature for a certain period of time, its mass changes due to erosion, and it is expressed as the percentage of mass change after acid immersion.
6.10.2 Reagents
Sulfuric acid (GB/T625): analytical grade, density 1.280±0.005g/cm* solution. 6.10.3 Preparation of samples
Samples are taken from the side of the single cell and from the middle partition of the integral cell, or standard samples are prepared using the same raw materials as the battery cell. The sample is 100mm long and 25mm wide. The thickness is based on the thickness of the battery cell wall and the thickness of the middle partition of the battery cell. The standard sample thickness is 3-5mm. The sample surface must be smooth and clean, and the surface layer and other substances that resist medium erosion must be removed. 6.10.4 Determination steps
Take five samples and weigh their total mass (accurate to 0.0001g) and place them in a ground-mouth wide-mouth bottle. Use a glass rod to separate the samples. Accurately add 500ml of sulfuric acid solution with a density of 1.280±0.005g/cm\ (25℃) to completely immerse the samples in the sulfuric acid solution. Cover the bottle with a lid and place it in a constant temperature box at a temperature of 60±2℃ for 168h. Then take out the bottle and cool it to room temperature. Take out the sample and test the potassium permanganate reduction substance and iron content in the acid solution. Rinse the acid-soaked sample with tap water until it is neutral (check with pH test paper), then wash with distilled water, wipe it dry with filter paper, let it stand for 1min, and then weigh the mass (accurate to 0.0001g). 6.10.5 Calculation and determination of results
The mass change rate is calculated according to formula (7):
m2=ml×100%.
Wherein: mp—mass change rate, %;
m1—mass of the sample before acid immersion, g;
m2—mass of the sample after acid immersion, g.
The calculation result is rounded to two significant figures. A positive result indicates an increase in mass, and a negative result indicates a decrease in mass. The absolute value of the calculation result should be qualified. Otherwise, the sample should be doubled and re-measured. If the result is still unqualified, the item is unqualified. 6.11 Determination of corrosion resistance
6.11.1 Principle
After the sample is immersed in a sulfuric acid solution at a certain temperature for a certain period of time, its appearance may change due to corrosion. Whether the appearance of the sample changes after acid immersion indicates corrosion resistance. 6.11.2 Test steps
After the mass change rate is determined, immediately visually test the apparent changes of the sample in a brightly lit room. 6.11.3 Result determination2.
For starting
For motorcycle
For navigation mark
For small valve-controlled sealed type
For railway passenger car
For internal combustion locomotive
For traction
For coal mine explosion-proof device
For mining lamp
Fixed acid-proof type
Fixed valve-controlled sealed type
6. 7 Determination of internal stress
6.7.1 Principle
JB/T3076—1999
Various specifications
Various specifications
Various specifications
Various specifications
Various specifications
Various specifications
Various specifications
≤100Ah
100~1000Ah
>1000Ah
Ball drop height
Fall height, mm
Plastic tanks made of non-crystalline polymers will produce cracks at the parts of the bottle where the stress is concentrated. Whether cracks appear after the plastic tank is exposed to non-polar solvents for a certain period of time indicates whether its internal stress is qualified. 6.7.2 Test steps
Pour carbon tetrachloride into three samples respectively, shake for 5 minutes to completely soak the four walls of the samples, then immediately pour out the carbon tetrachloride and rub the samples, observe whether the samples have cracks after 5 minutes. 6.7.3 Result determination
According to 6.6.3.2.
6.8 Determination of heat resistance
6.8.1 Principle
The battery tank is kept at a certain temperature for a certain period of time, cooled to room temperature, and the external dimensions change. The change in the external dimensions of the battery tank indicates its heat resistance.
6.8.2 Instruments and devices
Ruler: Graduation value 0.05mm;
-Constant temperature box.
6.8.3 Test steps
Take three samples, measure the length and width of the center of the sample notch and the center of the sample with a ruler and record them, mark the measuring points, and pour water into the sample at the temperature specified in Table 6, with the water surface 20±2mm away from the notch; put the sample in a constant temperature box at the temperature specified in Table 6 and keep it for 3; cut off the power supply, open the door of the constant temperature box and cool it for at least 24h (to room temperature), pour out the water in the tank, and immediately measure the length and width of the sample at the same position with a ruler and record them.
Table 6 Hundred
Heat resistance test conditions
Integral tank
Single tank
Result calculation and judgment
Temperature, ℃
Constant temperature overflow.℃
Constant temperature time, h
6.8.4.1 Integral tank
The heat resistance of the integral tank is calculated according to formula (1) and formula (2): Where: △L---change in length of the sample, mm; L
--length of the sample before heating, mm;
L2---length of the sample after heating, mm;
△W---change in width of the sample, mm;
W,--width of the sample before heating, mm;
width of the sample after heating, mm.
6.8.4.2 Single groove
JB/T3076—1999
AW=Wz-W1
The heat resistance of single groove is calculated according to formula (3) and formula (4): Lz-Li×100% ·
Wp-change rate of sample length, %; L
length of sample before heating, mm;
length of sample after heating, mm;
Wp-change rate of sample width, %;
W,-width of sample before heating, mm;
width of sample after heating, mm.
×100%
The calculation result is rounded to two significant figures, and the one with the largest absolute value among the three samples is the measured value. (1)
Both the length and width should be qualified. If they are unqualified, double sampling is required for re-measurement. If there are still unqualified samples, the item is unqualified. 6.9 Determination of air pressure resistance
6.9.1 Principle
After a certain pressure of gas is passed into the valve-controlled sealed battery tank, a certain deformation will occur due to expansion. The size of the deformation under a certain pressure is used to indicate the air pressure resistance of the tank.
6.9.2 Instruments and devices
A barometer; accuracy: 2.5 level, range 0~0.2MPa; U-type pressure gauge; accuracy: 1.5 level, range 0~0.1MPa. A safety cover;
A gas compressor.
6.9.3 Test steps
a) Take three samples and seal their lids (the whole slot is only sealed around the edges, not the middle interval); then seal the leaking parts such as the pole and safety valve; drill a hole with a diameter of 8 to 10 mm near the center of the side of the sealed sample and glue a glass tube (no leakage at the bonding point); b) Put the prepared sample into the safety cover, use a 0.15MPa gas source, when the pressure in the slot reaches 50kPa, keep it for 5 minutes, and measure the length and width within 20mm of the center of the outer wall of the sample; c) The length and width of the sample before the gas is passed are calculated as the minimum value, and the length and width of the sample after the gas is passed are calculated as the maximum value. 6.9.4 Result calculation and judgment
The gas pressure resistance in the length direction is calculated according to formula (5):
The gas pressure resistance in the width direction is calculated according to formula (6):
Where: L. The change rate of the sample in length direction, %; L---the length of the sample before pressurization, mm;
L2--the length of the sample after pressurization, mm;
W. The change rate of the sample in width direction, %;
W, the width of the sample before pressurization, mm;
Wz--the width of the sample after pressurization, mm; wwW.bzxz.Net
JB/T3076-1999
The calculated result is rounded to two significant figures, and the maximum change rate among the three samples is the measured value. (6)
Both the length and width directions should be qualified. If they are unqualified, double sampling is required for re-measurement. If there are still unqualified samples, the item is unqualified. 6.10 Determination of mass change rate
6.10.1 Principle
After the sample is immersed in sulfuric acid solution at a certain temperature for a certain period of time, its mass changes due to erosion, and it is expressed as the percentage of mass change after acid immersion.
6.10.2 Reagents
Sulfuric acid (GB/T625): analytical grade, density 1.280±0.005g/cm* solution. 6.10.3 Preparation of samples
Samples are taken from the side of the single cell and from the middle partition of the integral cell, or standard samples are prepared using the same raw materials as the battery cell. The sample is 100mm long and 25mm wide. The thickness is based on the thickness of the battery cell wall and the thickness of the middle partition of the battery cell. The standard sample thickness is 3-5mm. The sample surface must be smooth and clean, and the surface layer and other substances that resist medium erosion must be removed. 6.10.4 Determination steps
Take five samples and weigh their total mass (accurate to 0.0001g) and place them in a ground-mouth wide-mouth bottle. Use a glass rod to separate the samples. Accurately add 500ml of sulfuric acid solution with a density of 1.280±0.005g/cm\ (25℃) to completely immerse the samples in the sulfuric acid solution. Cover the bottle with a lid and place it in a constant temperature box at a temperature of 60±2℃ for 168h. Then take out the bottle and cool it to room temperature. Take out the sample and test the potassium permanganate reduction substance and iron content in the acid solution. Rinse the acid-soaked sample with tap water until it is neutral (check with pH test paper), then wash with distilled water, wipe it dry with filter paper, let it stand for 1min, and then weigh the mass (accurate to 0.0001g). 6.10.5 Calculation and determination of results
The mass change rate is calculated according to formula (7):
m2=ml×100%.
Wherein: mp—mass change rate, %;
m1—mass of the sample before acid immersion, g;
m2—mass of the sample after acid immersion, g.
The calculation result is rounded to two significant figures. A positive result indicates an increase in mass, and a negative result indicates a decrease in mass. The absolute value of the calculation result should be qualified. Otherwise, the sample should be doubled and re-measured. If the result is still unqualified, the item is unqualified. 6.11 Determination of corrosion resistance
6.11.1 Principle
After the sample is immersed in a sulfuric acid solution at a certain temperature for a certain period of time, its appearance may change due to corrosion. Whether the appearance of the sample changes after acid immersion indicates corrosion resistance. 6.11.2 Test steps
After the mass change rate is determined, immediately visually test the apparent changes of the sample in a brightly lit room. 6.11.3 Result determination1 Principle
JB/T3076—1999
Various specifications
Various specifications
Various specifications
Various specifications
Various specifications
Various specifications
Various specifications
≤100Ah
100~1000Ah
>1000Ah
Ball drop height
Fall height, mm
Plastic tanks made of non-crystalline polymers will produce cracks at the parts of the bottle where the stress is concentrated. Whether cracks are produced after the plastic tank is exposed to non-polar solvents for a certain period of time indicates whether its internal stress is qualified. 6.7.2 Test steps
Pour carbon tetrachloride into three samples respectively, shake for 5 minutes to completely soak the four walls of the samples, then immediately pour out the carbon tetrachloride and rub the samples, observe whether the samples have cracks after 5 minutes. 6.7.3 Result determination
According to 6.6.3.2.
6.8 Determination of heat resistance
6.8.1 Principle
The battery tank is kept at a certain temperature for a certain period of time, cooled to room temperature, and the external dimensions change. The change in the external dimensions of the battery tank indicates its heat resistance.
6.8.2 Instruments and devices
Ruler: Graduation value 0.05mm;
-Constant temperature box.
6.8.3 Test steps
Take three samples, measure the length and width of the center of the sample notch and the center of the sample with a ruler and record them, mark the measuring points, and pour water into the sample at the temperature specified in Table 6, with the water surface 20±2mm away from the notch; put the sample in a constant temperature box at the temperature specified in Table 6 and keep it for 3; cut off the power supply, open the door of the constant temperature box and cool it for at least 24h (to room temperature), pour out the water in the tank, and immediately measure the length and width of the sample at the same position with a ruler and record them.
Table 6 Hundred
Heat resistance test conditions
Integral tank
Single tank
Result calculation and judgment
Temperature, ℃
Constant temperature overflow.℃
Constant temperature time, h
6.8.4.1 Integral tank
The heat resistance of the integral tank is calculated according to formula (1) and formula (2): Where: △L---change in length of the sample, mm; L
--length of the sample before heating, mm;
L2---length of the sample after heating, mm;
△W---change in width of the sample, mm;
W,--width of the sample before heating, mm;
width of the sample after heating, mm.
6.8.4.2 Single groove
JB/T3076—1999
AW=Wz-W1
The heat resistance of single groove is calculated according to formula (3) and formula (4): Lz-Li×100% ·
Wp-change rate of sample length, %; L
length of sample before heating, mm;
length of sample after heating, mm;
Wp-change rate of sample width, %;
W,-width of sample before heating, mm;
width of sample after heating, mm.
×100%
The calculation result is rounded to two significant figures, and the one with the largest absolute value among the three samples is the measured value. (1)
Both the length and width should be qualified. If they are unqualified, double sampling is required for re-measurement. If there are still unqualified samples, the item is unqualified. 6.9 Determination of air pressure resistance
6.9.1 Principle
After a certain pressure of gas is passed into the valve-controlled sealed battery tank, a certain deformation will occur due to expansion. The size of the deformation under a certain pressure is used to indicate the air pressure resistance of the tank.
6.9.2 Instruments and devices
A barometer; accuracy: 2.5 level, range 0~0.2MPa; U-type pressure gauge; accuracy: 1.5 level, range 0~0.1MPa. A safety cover;
A gas compressor.
6.9.3 Test steps
a) Take three samples and seal their lids (the whole slot is only sealed around the edges, not the middle interval); then seal the leaking parts such as the pole and safety valve; drill a hole with a diameter of 8 to 10 mm near the center of the side of the sealed sample and glue a glass tube (no leakage at the bonding point); b) Put the prepared sample into the safety cover, use a 0.15MPa gas source, when the pressure in the slot reaches 50kPa, keep it for 5 minutes, and measure the length and width within 20mm of the center of the outer wall of the sample; c) The length and width of the sample before the gas is passed are calculated as the minimum value, and the length and width of the sample after the gas is passed are calculated as the maximum value. 6.9.4 Result calculation and judgment
The gas pressure resistance in the length direction is calculated according to formula (5):
The gas pressure resistance in the width direction is calculated according to formula (6):
Where: L. The change rate of the sample in length direction, %; L---the length of the sample before pressurization, mm;
L2--the length of the sample after pressurization, mm;
W. The change rate of the sample in width direction, %;
W, the width of the sample before pressurization, mm;
Wz--the width of the sample after pressurization, mm;
JB/T3076-1999
The calculated result is rounded to two significant figures, and the maximum change rate among the three samples is the measured value. (6)
Both the length and width directions should be qualified. If they are unqualified, double sampling is required for re-measurement. If there are still unqualified samples, the item is unqualified. 6.10 Determination of mass change rate
6.10.1 Principle
After the sample is immersed in sulfuric acid solution at a certain temperature for a certain period of time, its mass changes due to erosion, and it is expressed as the percentage of mass change after acid immersion.
6.10.2 Reagents
Sulfuric acid (GB/T625): analytical grade, density 1.280±0.005g/cm* solution. 6.10.3 Preparation of samples
Samples are taken from the side of the single cell and from the middle partition of the integral cell, or standard samples are prepared using the same raw materials as the battery cell. The sample is 100mm long and 25mm wide. The thickness is based on the thickness of the battery cell wall and the thickness of the middle partition of the battery cell. The standard sample thickness is 3-5mm. The sample surface must be smooth and clean, and the surface layer and other substances that resist medium erosion must be removed. 6.10.4 Determination steps
Take five samples and weigh their total mass (accurate to 0.0001g) and place them in a ground-mouth wide-mouth bottle. Use a glass rod to separate the samples. Accurately add 500ml of sulfuric acid solution with a density of 1.280±0.005g/cm\ (25℃) to completely immerse the samples in the sulfuric acid solution. Cover the bottle with a lid and place it in a constant temperature box at a temperature of 60±2℃ for 168h. Then take out the bottle and cool it to room temperature. Take out the sample and test the potassium permanganate reduction substance and iron content in the acid solution. Rinse the acid-soaked sample with tap water until it is neutral (check with pH test paper), then wash with distilled water, wipe it dry with filter paper, let it stand for 1min, and then weigh the mass (accurate to 0.0001g). 6.10.5 Calculation and determination of results
The mass change rate is calculated according to formula (7):
m2=ml×100%.
Wherein: mp—mass change rate, %;
m1—mass of the sample before acid immersion, g;
m2—mass of the sample after acid immersion, g.
The calculation result is rounded to two significant figures. A positive result indicates an increase in mass, and a negative result indicates a decrease in mass. The absolute value of the calculation result should be qualified. Otherwise, the sample should be doubled and re-measured. If the result is still unqualified, the item is unqualified. 6.11 Determination of corrosion resistance
6.11.1 Principle
After the sample is immersed in a sulfuric acid solution at a certain temperature for a certain period of time, its appearance may change due to corrosion. Whether the appearance of the sample changes after acid immersion indicates corrosion resistance. 6.11.2 Test steps
After the mass change rate is determined, immediately visually test the apparent changes of the sample in a brightly lit room. 6.11.3 Result determination1 Principle
JB/T3076—1999
Various specifications
Various specifications
Various specifications
Various specifications
Various specifications
Various specifications
Various specifications
≤100Ah
100~1000Ah
>1000Ah
Ball drop height
Fall height, mm
Plastic tanks made of non-crystalline polymers will produce cracks at the parts of the bottle where the stress is concentrated. Whether cracks are produced after the plastic tank is exposed to non-polar solvents for a certain period of time indicates whether its internal stress is qualified. 6.7.2 Test steps
Pour carbon tetrachloride into three samples respectively, shake for 5 minutes to completely soak the four walls of the samples, then immediately pour out the carbon tetrachloride and rub the samples, observe whether the samples have cracks after 5 minutes. 6.7.3 Result determination
According to 6.6.3.2.
6.8 Determination of heat resistance
6.8.1 Principle
The battery tank is kept at a certain temperature for a certain period of time, cooled to room temperature, and the external dimensions change. The change in the external dimensions of the battery tank indicates its heat resistance.
6.8.2 Instruments and devices
Ruler: Graduation value 0.05mm;
-Constant temperature box.
6.8.3 Test steps
Take three samples, measure the length and width of the center of the sample notch and the center of the sample with a ruler and record them, mark the measuring points, and pour water into the sample at the temperature specified in Table 6, with the water surface 20±2mm away from the notch; put the sample in a constant temperature box at the temperature specified in Table 6 and keep it for 3; cut off the power supply, open the door of the constant temperature box and cool it for at least 24h (to room temperature), pour out the water in the tank, and immediately measure the length and width of the sample at the same position with a ruler and record them.
Table 6 Hundred
Heat resistance test conditions
Integral tank
Single tank
Result calculation and judgment
Temperature, ℃
Constant temperature overflow.℃
Constant temperature time, h
6.8.4.1 Integral tank
The heat resistance of the integral tank is calculated according to formula (1) and formula (2): Where: △L---change in length of the sample, mm; L
--length of the sample before heating, mm;
L2---length of the sample after heating, mm;
△W---change in width of the sample, mm;
W,--width of the sample before heating, mm;
width of the sample after heating, mm.
6.8.4.2 Single groove
JB/T3076—1999
AW=Wz-W1
The heat resistance of single groove is calculated according to formula (3) and formula (4): Lz-Li×100% ·
Wp-change rate of sample length, %; L
length of sample before heating, mm;
length of sample after heating, mm;
Wp-change rate of sample width, %;
W,-width of sample before heating, mm;
width of sample after heating, mm.
×100%
The calculation result is rounded to two significant figures, and the one with the largest absolute value among the three samples is the measured value. (1)
Both the length and width should be qualified. If they are unqualified, double sampling is required for re-measurement. If there are still unqualified samples, the item is unqualified. 6.9 Determination of air pressure resistance
6.9.1 Principle
After a certain pressure of gas is passed into the valve-controlled sealed battery tank, a certain deformation will occur due to expansion. The size of the deformation under a certain pressure is used to indicate the air pressure resistance of the tank.
6.9.2 Instruments and devices
A barometer; accuracy: 2.5 level, range 0~0.2MPa; U-type pressure gauge; accuracy: 1.5 level, range 0~0.1MPa. A safety cover;
A gas compressor.
6.9.3 Test steps
a) Take three samples and seal their lids (the whole slot is only sealed around the edges, not the middle interval); then seal the leaking parts such as the pole and safety valve; drill a hole with a diameter of 8 to 10 mm near the center of the side of the sealed sample and glue a glass tube (no leakage at the bonding point); b) Put the prepared sample into the safety cover, use a 0.15MPa gas source, when the pressure in the slot reaches 50kPa, keep it for 5 minutes, and measure the length and width within 20mm of the center of the outer wall of the sample; c) The length and width of the sample before the gas is passed are calculated as the minimum value, and the length and width of the sample after the gas is passed are calculated as the maximum value. 6.9.4 Result calculation and judgment
The gas pressure resistance in the length direction is calculated according to formula (5):
The gas pressure resistance in the width direction is calculated according to formula (6):
Where: L. The change rate of the sample in length direction, %; L---the length of the sample before pressurization, mm;
L2--the length of the sample after pressurization, mm;
W. The change rate of the sample in width direction, %;
W, the width of the sample before pressurization, mm;
Wz--the width of the sample after pressurization, mm;
JB/T3076-1999
The calculated result is rounded to two significant figures, and the maximum change rate among the three samples is the measured value. (6)
Both the length and width directions should be qualified. If they are unqualified, double sampling is required for re-measurement. If there are still unqualified samples, the item is unqualified. 6.10 Determination of mass change rate
6.10.1 Principle
After the sample is immersed in sulfuric acid solution at a certain temperature for a certain period of time, its mass changes due to erosion, and it is expressed as the percentage of mass change after acid immersion.
6.10.2 Reagents
Sulfuric acid (GB/T625): analytical grade, density 1.280±0.005g/cm* solution. 6.10.3 Preparation of samples
Samples are taken from the side of the single cell and from the middle partition of the integral cell, or standard samples are prepared using the same raw materials as the battery cell. The sample is 100mm long and 25mm wide. The thickness is based on the thickness of the battery cell wall and the thickness of the middle partition of the battery cell. The standard sample thickness is 3-5mm. The sample surface must be smooth and clean, and the surface layer and other substances that resist medium erosion must be removed. 6.10.4 Determination steps
Take five samples and weigh their total mass (accurate to 0.0001g) and place them in a ground-mouth wide-mouth bottle. Use a glass rod to separate the samples. Accurately add 500ml of sulfuric acid solution with a density of 1.280±0.005g/cm\ (25℃) to completely immerse the samples in the sulfuric acid solution. Cover the bottle with a lid and place it in a constant temperature box at a temperature of 60±2℃ for 168h. Then take out the bottle and cool it to room temperature. Take out the sample and test the potassium permanganate reduction substance and iron content in the acid solution. Rinse the acid-soaked sample with tap water until it is neutral (check with pH test paper), then wash with distilled water, wipe it dry with filter paper, let it stand for 1min, and then weigh the mass (accurate to 0.0001g). 6.10.5 Calculation and determination of results
The mass change rate is calculated according to formula (7):
m2=ml×100%.
Wherein: mp—mass change rate, %;
m1—mass of the sample before acid immersion, g;
m2—mass of the sample after acid immersion, g.
The calculation result is rounded to two significant figures. A positive result indicates an increase in mass, and a negative result indicates a decrease in mass. The absolute value of the calculation result should be qualified. Otherwise, the sample should be doubled and re-measured. If the result is still unqualified, the item is unqualified. 6.11 Determination of corrosion resistance
6.11.1 Principle
After the sample is immersed in a sulfuric acid solution at a certain temperature for a certain period of time, its appearance may change due to corrosion. Whether the appearance of the sample changes after acid immersion indicates corrosion resistance. 6.11.2 Test steps
After the mass change rate is determined, immediately visually test the apparent changes of the sample in a brightly lit room. 6.11.3 Result determination2 Test steps
Pour carbon tetrachloride into three samples respectively, shake for 5 minutes to completely soak the four walls of the samples, then immediately pour out the carbon tetrachloride and rub the samples, observe whether the samples have cracks after 5 minutes. 6.7.3 Result determination
According to 6.6.3.2.
6.8 Determination of heat resistance
6.8.1 Principle
The battery tank is kept at a certain temperature for a certain period of time, cooled to room temperature, and the external dimensions change. The change in the external dimensions of the battery tank indicates its heat resistance.
6.8.2 Instruments and devices
Ruler: Graduation value 0.05mm;
-Constant temperature box.
6.8.3 Test steps
Take three samples, measure the length and width of the center of the sample notch and the center of the sample with a ruler and record them, mark the measuring points, and pour water into the sample at the temperature specified in Table 6, with the water surface 20±2mm away from the notch; put the sample in a constant temperature box at the temperature specified in Table 6 and keep it for 3; cut off the power supply, open the door of the constant temperature box and cool it for at least 24h (to room temperature), pour out the water in the tank, and immediately measure the length and width of the sample at the same position with a ruler and record them.
Table 6 Hundred
Heat resistance test conditions
Integral tank
Single tank
Result calculation and judgment
Temperature, ℃
Constant temperature overflow.℃
Constant temperature time, h
6.8.4.1 Integral tank
The heat resistance of the integral tank is calculated according to formula (1) and formula (2): Where: △L---change in length of the sample, mm; L
--length of the sample before heating, mm;
L2---length of the sample after heating, mm;
△W---change in width of the sample, mm;
W,--width of the sample before heating, mm;
width of the sample after heating, mm.
6.8.4.2 Single groove
JB/T3076—1999
AW=Wz-W1
The heat resistance of single groove is calculated according to formula (3) and formula (4): Lz-Li×100% ·
Wp-change rate of sample length, %; L
length of sample before heating, mm;
length of sample after heating, mm;
Wp-change rate of sample width, %;
W,-width of sample before heating, mm;
width of sample after heating, mm.
×100%
The calculation result is rounded to two significant figures, and the one with the largest absolute value among the three samples is the measured value. (1)
Both the length and width should be qualified. If they are unqualified, double sampling is required for re-measurement. If there are still unqualified samples, the item is unqualified. 6.9 Determination of air pressure resistance
6.9.1 Principle
After a certain pressure of gas is passed into the valve-controlled sealed battery tank, a certain deformation will occur due to expansion. The size of the deformation under a certain pressure is used to indicate the air pressure resistance of the tank.
6.9.2 Instruments and devices
A barometer; accuracy: 2.5 level, range 0~0.2MPa; U-type pressure gauge; accuracy: 1.5 level, range 0~0.1MPa. A safety cover;
A gas compressor.
6.9.3 Test steps
a) Take three samples and seal their lids (the whole slot is only sealed around the edges, not the middle interval); then seal the leaking parts such as the pole and safety valve; drill a hole with a diameter of 8 to 10 mm near the center of the side of the sealed sample and glue a glass tube (no leak
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