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Method for detecting lithium ion battery airtightness

A technology for air tightness testing and lithium-ion batteries, which can be used in fluid tightness testing, electrical components, secondary batteries, etc., and can solve problems such as batteries entering the market

Active Publication Date: 2008-07-23
SHENZHEN BAK POWER BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This detection method is only artificially and intuitively judging whether it is leaking according to the speed of the bubbles, without quantitative standards; this method of testing the battery seal without the same standard will lead to two adverse consequences: 1. The battery has a slight air leakage However, it does not affect the normal use of the battery and is diagnosed as a bad battery; 2. A leaking battery that has just exceeded the leak boundary line is misjudged as a non-leaking battery, causing batteries with quality defects to flow into the market

Method used

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  • Method for detecting lithium ion battery airtightness
  • Method for detecting lithium ion battery airtightness

Examples

Experimental program
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Embodiment 1

[0022] A method for detecting air tightness of a lithium ion battery, comprising the steps of:

[0023] Carry out air tightness test on 30 unsealed batteries with aluminum case 423450 at an air pressure of 0.093MPa, and record the corresponding air leakage rate of each battery;

[0024] b. Bake the battery at 65°C for 16 hours;

[0025] c. Inject the electrolyte into the battery;

[0026] d. Seal the battery injection hole;

[0027] e. Immerse the battery in water for 3 minutes;

[0028] f. Take out the battery and let it stand for 30 minutes;

[0029] g. Measure the thickness of each battery, and judge whether its thickness variation range is qualified, see Table (1);

[0030] h. According to the battery whose thickness change is qualified, it is determined that the air leakage speed range corresponding to the air leakage rate during the air tightness test is not less than 3.5 seconds when the time difference between the bubbles is not less than 3.5 seconds.

[0031] i. ...

Embodiment 2

[0038] A method for detecting air tightness of a lithium ion battery, comprising the steps of:

[0039] a. Carry out air tightness test on 30 unsealed 423450 batteries with aluminum casing at an air pressure of 0.093MPa, and record the corresponding air leakage rate of each battery;

[0040] b. Bake the battery at 70°C for 10 hours;

[0041] c. Inject the electrolyte into the battery, then place the battery for aging and pre-charge

[0042] d. Seal the battery injection hole;

[0043] e. Immerse the battery in water for 10 minutes;

[0044] f. Take out the battery and let the battery stand for 4 hours;

[0045] g. Measure the thickness of each battery, and judge whether its thickness variation range is qualified, see Table (2);

[0046] h. According to the battery whose thickness change is qualified, it is determined that the air leakage speed range corresponding to the air leakage rate during the air tightness test is not less than 3.5 seconds when the time difference bet...

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Abstract

The invention relates to a method for detecting gas tightness of lithium ion battery and the method detects the gas tightness of the battery through a standard which is preset by experiment under certain air pressure. The detection method is fit for the gas tightness detection working procedure in the battery preparation process and can detect the battery precisely, which doesn't mistake detecting the battery to generate waste and prevents the disqualified battery from entering into the next process and market simultaneously.

Description

technical field [0001] The invention relates to a method for detecting the air tightness of a lithium ion battery, in particular to a method for detecting the air tightness of a lithium ion battery by using negative pressure. Background technique [0002] In the production process of lithium-ion batteries, there is a step of testing the airtightness of the battery before the battery is injected with electrolyte. The purpose of this step is to test the tightness of the battery weld seam and eliminate batteries with unqualified airtightness. Usually, the battery is pumped with negative pressure, and the gas flows through the detection bottle with liquid. By observing the speed of the bubbles in the detection bottle, it can be judged whether the battery is leaking or not. This detection method is only artificially and intuitively judging whether it is leaking according to the speed of the bubbles, and there is no quantitative standard; this method of testing the sealing of the ...

Claims

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Application Information

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IPC IPC(8): H01M10/38H01M10/40G01M3/00
Inventor 刘付勇辛燕唐赞谦张同富邱恋东黄满湘
Owner SHENZHEN BAK POWER BATTERY CO LTD
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