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Method for testing size changing rate of battery diaphragm

A dimensional change rate and battery diaphragm technology, which is applied in the repair/maintenance of lithium batteries, non-aqueous electrolyte batteries, secondary batteries, etc., to achieve low test conditions, reduce measurement errors, and ensure test data effects

Inactive Publication Date: 2010-02-24
CHERY AUTOMOBILE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

There are currently no mature test methods available

Method used

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  • Method for testing size changing rate of battery diaphragm
  • Method for testing size changing rate of battery diaphragm

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The test method steps of the present embodiment are as follows:

[0023] A: Cut the sample at the plane position of the diaphragm material to be tested;

[0024] B: if figure 1 As shown, cut the sample into a rectangle;

[0025] C: Place it under the initial environmental conditions of temperature 23°C and relative humidity 50% for 24 hours, then test the original length L0 and original width W0 of the sample (take the average value of three measurements), and record;

[0026] D: According to the test requirements, increase the temperature of the oven to the predetermined temperature of 100°C. After the internal temperature of the oven is stable, place the sample flat on the specified support and put it into the oven. After the storage time reaches the predetermined time (usually one hour) take out;

[0027] E: Take the sample out of the test environment and place it at 30°C for at least 30 minutes for climate adaptation, then measure its final length L1 and final wi...

Embodiment 2

[0039] Such as figure 2 As shown, the difference from Example 1 is that in this example, the sample is cut into a circle, and the original diameter of the sample in multiple directions (Φ1~Φ5) and the corresponding final diameter after the test are tested, To obtain the dimensional change rate of the sample in the above-mentioned multiple directions.

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Abstract

The invention aims at providing a method for testing a size changing rate of a battery diaphragm, which can conveniently, quickly and accurately measure the size changing rate of the battery diaphragmand ensure the use safety of a lithium ion battery. The method comprises the following steps: A. intercepting a sample on a diaphragm material to be tested; B. cutting the sample according to a scheduled shape; C. testing the original size of the sample under the condition of the initial environment, and recording the original size; D. testing the scheduled time of the sample which is placed in atest environment; E. taking the sample out of the test environment, carrying out climate adaptation treatment, and measuring a final size; and F. calculating the size changing rate according to the original size and the final size of the tested sample. The method for testing the size changing rate of the battery diaphragm has simple steps and low test condition requirements, can conveniently andquickly test the size changing rate of the battery diaphragm by a comparison test of two environments; in addition, the method adopts a plurality of measures to reduce measuring errors and ensure theaccuracy of test data.

Description

technical field [0001] The invention belongs to the technical field of hybrid vehicle manufacturing, and in particular relates to the testing technology of lithium-ion battery diaphragms used in hybrid vehicles. Background technique [0002] The main function of the lithium-ion battery separator is to prevent the direct electronic contact between the positive and negative electrodes in the battery and ensure that ions can pass through freely. Since the battery separator is a polymer material, the long-chain molecules are stretched and frozen during processing. When the activation energy of the molecules is increased, the chain segments are curled to a certain extent, so that the size of the product changes to a certain extent. The change is usually expressed by the rate of dimensional change (also called the rate of dimensional shrinkage). If the dimensional change rate of the battery separator is too large, it will cause the rupture of the separator or the exposure of the ...

Claims

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Application Information

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IPC IPC(8): G01B21/02G01B21/10G01N25/00
CPCY02E60/122G01B21/02H01M10/052H01M10/42Y02E60/10
Inventor 唐少俊
Owner CHERY AUTOMOBILE CO LTD
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