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Method for testing compression amount of positive electrode sealing element of lithium battery

A testing method and technology of sealing parts, applied in the direction of measuring devices, mechanical measuring devices, instruments, etc., can solve the problems of fragile samples, inaccurate data, destructive samples, etc., achieve accurate measurement results, reduce measurement errors, Effect of reduction in seal compression

Pending Publication Date: 2021-11-30
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But now there is no reasonable and accurate method to test the specific situation after the seal is sealed into the cover plate. Common methods are very destructive to the sample and are easy to damage the sample, making the obtained data inaccurate

Method used

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  • Method for testing compression amount of positive electrode sealing element of lithium battery
  • Method for testing compression amount of positive electrode sealing element of lithium battery
  • Method for testing compression amount of positive electrode sealing element of lithium battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Sample: 32135 lithium battery cover

[0035] Such as figure 1 Shown, a kind of test method of the compression of lithium battery positive electrode seal, comprises the following steps:

[0036] S1. Use a screw micrometer to measure the size of the seal 10 times without sealing the cover plate, take the average value N1 of multi-point measurement, and take the average value N1=0.998mm;

[0037] S2, the sealing member is assembled into the supporting battery cover plate as a sample;

[0038] S3. Turn on the industrial CT system and perform standard sample calibration. The industrial CT system scans the compressed seal cover plate according to the set scanning process parameters to obtain the CT image of the corresponding sample, such as figure 2 shown;

[0039] Turn on the industrial CT system and calibrate the standard sample as follows: use the stylus (ruby diameter 2.5mm) to calibrate the industrial CT detection equipment, and adjust the resolution to 25 μm.

[00...

Embodiment 2

[0048] Sample: standard VDA type battery cover positive electrode

[0049] Such as figure 1 Shown, a kind of test method of the compression of lithium battery positive electrode seal, comprises the following steps:

[0050] S1. Use a screw micrometer to measure the size of the seal 10 times without sealing the cover plate, take the average value N1 of multi-point measurement, and take the average value N1=0.999mm;

[0051] S2, the sealing member is assembled into the supporting battery cover plate as a sample;

[0052]S3. Turn on the industrial CT system and perform standard sample calibration. The industrial CT system scans the compressed seal cover plate according to the set scanning process parameters to obtain the CT image of the corresponding sample, such as figure 2 shown;

[0053] Turn on the industrial CT system and calibrate the standard sample as follows: use the stylus (ruby diameter 2.5mm) to calibrate the industrial CT detection equipment, and adjust the resol...

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Abstract

The invention provides a method for testing the compression amount of a positive electrode sealing element of a lithium battery. The method comprises the following steps of: S1, measuring the size of a sealing element which is not sealed in a lithium battery by using a measuring tool, and performing multi-point measurement to obtain an average value N1; S2, assembling the sealing element into a matched battery cover plate which is used as a sample; S3, starting an industrial CT system, carrying out standard sample calibration, making the industrial CT system scan the compressed sealing element cover plate according to set scanning process parameters, and obtain a CT image of the corresponding sample; S4, making the industrial CT system reconstruct the CT image, establishing a coordinate system, measuring the size of the sealing element, taking the average value N2 of multi-point measurement, and enabling the compression amount of first compression of the sealing element to be N1-N2 / N1; and S5, performing charging and discharging the battery for a plurality of weeks, repeating the step S3 by the industrial CT system, measuring the size of the sealing element after being compressed for multiple times, taking an average value N3, and enabling the compression amount of the sealing element after charging and discharging to be N1-N3 / N1. Under the condition that the lithium battery does not need to be disassembled, the change of the compression amount and the tightness degree of the sealing element is detected in real time in a lossless manner, and the measurement result is accurate.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion power batteries, and in particular relates to a method for testing the compression amount of a positive electrode seal of a lithium battery. Background technique [0002] For a long time, with the continuous improvement of the energy density of lithium batteries, the safety hazards of lithium batteries have also followed, and accidents of various types of electric vehicles catching fire and blasting have emerged in endlessly. Safety is the primary issue in the development of electric vehicles. The positive electrode seal is one of the important components in the lithium battery cover. It plays an important role in preventing electrolyte leakage and protecting the safety of lithium batteries. Therefore, it is an indispensable step in the production process of lithium batteries to study the actual efficacy of seals and select appropriate seal materials. But now there is no reasonable and accu...

Claims

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Application Information

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IPC IPC(8): G01B5/00G01B15/00
CPCG01B5/00G01B15/00Y02E60/10
Inventor 刘陈飞张峥胡淑婉陆大班
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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