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Method and device for measuring diaphragm closed pore temperature and broken film temperature of lithium ion battery

A lithium-ion battery, closed-cell temperature technology, used in measuring devices, electrical devices, thermometers, etc., can solve problems such as safety hazards, diaphragm suppliers have not provided the diaphragm temperature range, testing, etc., to achieve the effect of extending service life

Inactive Publication Date: 2010-01-13
TIANJIN LISHEN BATTERY
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Problems solved by technology

[0004] At present, the properties of diaphragms of different types and specifications are different, but diaphragm suppliers have not provided the temperature range for safe use of diaphragms, and many manufacturers cannot effectively test this. Therefore, making lithium-ion batteries The selection of the middle diaphragm is still in a blind state, and there is a great potential safety hazard

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  • Method and device for measuring diaphragm closed pore temperature and broken film temperature of lithium ion battery
  • Method and device for measuring diaphragm closed pore temperature and broken film temperature of lithium ion battery
  • Method and device for measuring diaphragm closed pore temperature and broken film temperature of lithium ion battery

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Embodiment Construction

[0021] The invention provides a kind of test method of lithium-ion battery diaphragm closed-cell temperature and rupture temperature, in this example, the diaphragm sample of manufacturer A of commercially available PE (polyethylene) material is tested, and it is characterized in that comprising the following steps:

[0022] (1) Make a test battery: such as figure 1 As shown, the existing model is selected as CR2430 button battery to make test battery 2, such as figure 1 As shown, cut the test diaphragm 23 with the diaphragm sample of manufacturer A. First, the test diaphragm 23 whose diameter is larger than the test diaphragm 23 at the end mask with an insulating layer of the battery case 21 injected with the electrolyte 22 is larger than the port of the battery case, and then the battery cover 24 is fastened and used. The battery sealing machine is sealed to ensure that the test diaphragm 23 separates the battery case 21 and the battery cover 24 into two independent chambers...

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Abstract

The invention relates to a method and a device for measuring diaphragm closed pore temperature and broken film temperature of a lithium ion battery, which is characterized by comprising the following steps: (1) preparing a testing battery; (2) heating the testing battery and rising the ambient temperature from 30 DEG C to 200 DEG C; (3) recording data, recording the temperature of the testing battery every 5 sec and resistance corresponding to the temperature; (4) processing data, drawing a temperature-resistance curve for the testing battery, calculating the change of the resistance at interval of 5 sec, and determining the closed pore temperature and broken film temperature according to the rising amount of the resistance to excess 50 omega for the first time and the reducing amount of the resistance to excess 50 omega fro the first time; and (5) calculating the result. The device in the invention comprises a baking oven, a resistance tester and a thermocouple; wherein, the resistance tester is connected with a lug of the testing battery; the thermocouple is connected with the testing battery in a contacting manner. The invention has the advantages of conveniently measuring the diaphragm closed pore temperature and broken film temperature of the lithium ion battery and providing basis and safe guarantee for selecting diaphragm in proper category when preparing the lithium battery.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to a method and a device for testing the closed cell temperature and membrane rupture temperature of a lithium-ion battery diaphragm. Background technique [0002] The role of the separator between the positive and negative electrodes in the lithium-ion battery is to isolate the positive and negative electrodes to prevent electrons from passing through, but to allow ions to pass through. When the lithium-ion battery is abnormal, the diaphragm can prevent the passage of ions, stop the battery reaction, and improve the battery life. Therefore, the performance of the diaphragm plays a very important role in the overall performance of the lithium-ion battery. [0003] Since the separator in the lithium-ion battery has numerous micropores, its safety is the first consideration in the application of the separator. When the lithium-ion battery is short-circuited, the heat generated make...

Claims

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Application Information

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IPC IPC(8): G01K7/04G01R31/36H01M10/38H01M2/14
Inventor 纪书文马佳鑫高俊奎李慧芳
Owner TIANJIN LISHEN BATTERY
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