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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  • 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

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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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Example Embodiment

[0021] Example 1

[0022] A lithium-ion battery air tightness detection method includes the following steps:

[0023] 30 unsealed batteries with aluminum shell 423450 were tested for air tightness at an air pressure of 0.093 MPa, and the corresponding air leakage rate of each battery was recorded;

[0024] b. Bake the battery at 65℃ 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 the battery stand for 30 minutes;

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

[0030] h. According to the qualified battery with thickness change, it is determined that the air leakage speed range corresponding to the air tightness test is not less than 3.5 seconds when the air bubble interval is detected.

[0031] i. The time difference between bubbles ...

Example Embodiment

[0037] Example 2

[0038] A lithium-ion battery air tightness detection method includes the following steps:

[0039] a. Airtightness testing was carried out on 30 unsealed batteries of type 423450 with aluminum shell under the air pressure of 0.093MPa, and the corresponding air leakage rate of each battery was recorded;

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

[0041] c. The electrolyte is injected into the battery, and then the battery is aged and pre-charged

[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 the thickness variation range is qualified, see Table (2);

[0046] h. According to the qualified battery with thickness change, it is determined that the air leakage speed range corresponding to the air tightness test is not less than 3.5 seconds when the air bubble...

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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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