GB/T 37996-2019 English PDF (GB/T37996-2019)

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GB/T 37996-2019: Rubber seals used in the power lithium battery
GB/T 37996-2019
Rubber seals used in the power lithium battery
ICS 83.140.50
G43
National Standards of People's Republic of China
Rubber seals for power lithium batteries
2019-08-30 released
2020-07-01 implementation
State Administration for Market Regulation
Issued by China National Standardization Administration
Preface
This standard was drafted in accordance with the rules given in GB/T 1.1-2009.
This standard was proposed by the China Petroleum and Chemical Industry Federation.
This standard is under the jurisdiction of the National Rubber and Rubber Products Standardization Technical Committee (SAC/TC35).
Drafting organizations of this standard. Zhejiang Hongda Special Rubber Products Co., Ltd., Zhejiang Shangyu Oil Seal Manufacturing Co., Ltd., Northwest Rubber and Plastics
Research and Design Institute Co., Ltd., Guangzhou Academy of Mechanical Sciences Co., Ltd., Xi'an Xiangyang Aerospace Materials Co., Ltd., Suzhou Hyde New Materials
Material Technology Co., Ltd., Shanghai Rushi Sealing Technology Co., Ltd., AVIC Lithium Battery (Luoyang) Co., Ltd., Yixing Kaida Fluorine Rubber Seal
Co., Ltd., Zhejiang Jiabeisi Green Energy Co., Ltd., Anhui Zhongding Sealing Co., Ltd., Chengdu Shengbang Sealing Co., Ltd.
Company, Changzhou Langbo Sealing Technology Co., Ltd., Qingdao Railway Rubber Factory.
The main drafters of this standard. Chen Hong, Huang Huikun, Gao Jingru, Qian Handong, Wang Yong, Yuan Jianglong, Chen Ping, Li Enjun, Yin Jiushan, Qian Kai,
Wen Ren Hongyan, Fang Binghu, Fan Debo, Wu Xingcai, Wang Yulian, Ye Changqing, Wu Zhifeng, Gou Wenliang, Li Zhenhuan, Wen Renhongquan, Xu Yaodong, Ye Mei,
Pan Zhiye.
Rubber seals for power lithium batteries
1 Scope
This standard specifies the terms and definitions, requirements, test methods, inspection rules, marking, packaging, transportation, and storage of rubber seals for power lithium batteries.
This standard applies to rubber seals for power lithium batteries (hereinafter referred to as seals).
2 Normative references
The following documents are indispensable for the application of this document. For dated reference documents, only the dated version applies to this article
Pieces. For undated references, the latest version (including all amendments) applies to this document.
GB/T 528 Determination of tensile stress and strain properties of vulcanized rubber or thermoplastic
GB/T 531.1 Test method for indentation hardness of vulcanized rubber or thermoplastic rubber Part 1.Shore durometer method (Shore hardness)
GB/T 1690 Test method for liquid resistance of vulcanized rubber or thermoplastic rubber
GB/T 2828.1 Sampling inspection procedure by attributes Part 1.Batch inspection sampling plan retrieved by acceptance quality limit (AQL)
GB/T 2900.41 Electrician terminology primary batteries and accumulators
GB/T 2941 Rubber Physical Test Method General Procedure for Sample Preparation and Adjustment
GB/T 3452.1 O-shaped rubber seals for hydraulic and pneumatic parts 1.Dimension series and tolerances
GB/T 3512 Hot air accelerated aging and heat resistance test of vulcanized rubber or thermoplastic rubber
GB/T 3672.1 Tolerances of rubber products Part 1.Dimensional tolerances
GB/T 5721 General provisions for marking, packaging, transportation and storage of rubber seal products
GB/T 7759.1 Determination of compression set of vulcanized rubber or thermoplastic rubber Part 1.Under normal and high temperature conditions
3 Terms and definitions
The terms and definitions defined in GB/T 2900.41 apply to this document.
4 requirements
4.1 Appearance
The surface of the seal should not have rubber edges, lack of glue, cracks, bubbles, impurities and protruding fillers.
4.2 Specifications
The size and tolerance of the O-ring should meet the requirements of the G series in GB/T 3452.1, and the size and tolerance of the rectangular ring should meet the GB/T 3672.1
The regulations of M2 level.
4.3 Insulation resistance
The resistance index is negotiated between the manufacturer and the user.
4.4 Properties of rubber materials
The seal is made of ethylene propylene rubber or fluorine rubber as the base material, and its performance requirements are shown in Table 1 and Table 2.
5 Test method
5.1 Appearance
Observe visually under bright light conditions.
5.2 Specifications and dimensions
The sample should be adjusted according to the requirements of GB/T 2941, and the length, width or diameter of the rubber seal should be adjusted with a vernier caliper with an graduation of 0.02mm or
Measured with a size projector; the thickness is measured with a special rubber thickness gauge with 0.01mm division.
5.3 Insulation resistance of seals
5.3.1 Test instruments and devices
5.3.1.1 Resistance tester
The voltage range is 10V~1000V, the voltage accuracy is ±2%; the insulation resistance accuracy is ±2%.
5.3.1.2 Device
The device consists of a base, a pillar, a bolt knob, a metal baffle, an insulating plate, and an electrode, as shown in Figure 1.
The electrode is a copper sheet fixed on an insulating board with a length and width of not less than 15mm and a thickness of 1mm~2mm. The surface of the electrode should be smooth and clean.
Clean, uniform color and no impurities; the insulating board is made of epoxy resin electrical insulating board material, one end of the electrode should be fixed, the other end of the electrode can be moved, and
Tighten so that the sample can be compressed.
5.3.2 Sample
Take the seal as the sample, the number of samples is 3, and the samples are adjusted in accordance with GB/T 2941.
5.3.3 Procedure
5.3.3.1 Set the test voltage of the resistance tester (5.3.1.1) to 500V, clear it in the discharge mode, and enter the test mode.
5.3.3.2 Place the sample between the electrodes, and tighten the compression sample through one end of the electrode, as shown in Figure 1.The compression rate is about 30% of the thickness of the rubber sample.
5.3.3.3 Use two test wires to contact two copper sheets respectively, record the insulation resistance value displayed by the insulation resistance tester, and test one for each sample.
Second, the average value of 3 samples is used as the insulation resistance.
5.4 Rubber performance test method
5.4.1 Preparation and adjustment of samples
The sample was prepared according to the molding method specified in GB/T 2941 and adjusted according to GB/T 2941.
5.4.2 Physical performance test
5.4.2.1 Hardness
Test according to GB/T 531.1.
5.4.2.2 Tensile strength and elongation at break
Test according to GB/T 528, using type 1 sample.
5.4.2.3 Compression set
Carry out the test according to the provisions of GB/T 7759.1, using B-shaped specimens.
5.4.2.5 Resistant to electrolyte
Warning---When preparing or operating the test liquid, it should be carried out under an effective ventilation device to avoid the test liquid and skin or ordinary clothing
Contact and keep away from heat sources.
5.4.2.5.1 The sample is a rubber test piece of 25mm×25mm×2mm.
5.4.2.5.2 The electrolyte shall be provided by the user.
5.4.2.5.3 The containers are two sealable transparent polypropylene (PP) plastic bottles; during the test, one of the containers contains 50 mL of electrolyte as
Blank solution, another container with 50mL electrolyte for soaking the sample.
5.4.2.5.4 After the sample (5.4.2.5.1) is immersed in 50mL electrolyte (5.4.2.5.2) at 70°C for 168h in accordance with the provisions of GB/T 1690,
Take out the container (5.4.2.5.3) from the 70 ℃ aging box, let it stand for 30 min at room temperature, compare with the blank solution, and observe whether the color of the solution changes.
5.4.2.5.5 Take the sample out of the container, wipe off the liquid on the surface of the sample with filter paper, and measure according to GB/T 1690 (test
The sample is taken out of the liquid to the completion of the measurement, should not exceed 5min), and calculate the percentage of mass change.
6 Inspection rules
6.1 The rubber materials produced in the same shift and on the same machine shall be a batch of no more than 50kg; seals of the same specification produced by the same batch of rubber materials
No more than 5000 pieces are a batch.
6.2 A sample of 500g should be randomly taken from each batch of rubber materials to prepare a sample, and the factory inspection shall be carried out according to the requirements of items 1 to 4 in Table 1 or Table 2.
6.3 The appearance of the seal should be 100% inspected; the size of the seal should be inspected according to GB/T 2828.1, the inspection level is Ⅱ, normal one
The second inspection AQL=2.5; the insulation resistance of the seals should be randomly selected from each batch of 3 seals for testing.
6.4 When one of the following situations occurs, all requirements of Chapter 4 shall be inspected.
---When the product is transferred to the factory or the new product is finalized and identified;
---After formal production, if major changes in materials and processes may affect product performance;
---Products have been discontinued for more than six months, when production resumes;
---When there is a big difference between the factory inspection result and the last formal inspection.
6.5 If the appearance inspection of the seal is unqualified, the seal is unqualified; if the size of the seal is unqualified, the batch is unqualified; insulation resistance
If it is unqualified, the batch of seals is unqualified.
6.6 When the inspection result of the rubber material is unqualified, a double sample shall be taken to re-inspect the unqualified item. If the re-inspection is still unqualified, it is considered unqualified.
7 Marking, packaging, transportation and storage
The marking, packaging, transportation and storage shall comply with the regulations of GB/T 5721.