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Detection method for packaging effect of soft package lithium battery

A soft-pack lithium battery and detection method technology, which is applied to secondary batteries, battery pack components, battery boxes/coats, etc., can solve problems such as time-consuming, delayed discovery of product quality problems, and long battery production cycles. Achieve the effect of accurate detection, simple application and shortened test cycle

Inactive Publication Date: 2017-03-15
TIANJIN LISHEN BATTERY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The current method of testing the effect of the encapsulation process requires homogenizing the positive and negative electrode materials, coating them to make pole pieces, and then making pole groups by winding or stacking, and finally encapsulating and injecting the pole groups. And final packaging, after the finished battery is made, put the finished battery in a high-temperature, high-humidity

Method used

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  • Detection method for packaging effect of soft package lithium battery
  • Detection method for packaging effect of soft package lithium battery
  • Detection method for packaging effect of soft package lithium battery

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Experimental program
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specific Embodiment approach

[0019] Below in conjunction with the accompanying drawings, the specific implementation methods and features provided according to the present invention are described in detail as follows:

[0020] Such as Figure 1-Figure 3 As shown, a method for detecting the encapsulation effect of a soft-pack lithium battery, the specific implementation steps of the method are as follows:

[0021] (1) Punch the ALF (Aluminum Laminated Film) aluminum-plastic film into the shell; fix the tabs at the corresponding positions of the positive and negative tabs, and fix the tabs at the corresponding positions with scotch tape or adhesive; if the top package uses soft When packaging, there is no need to fix the tab process;

[0022] (2) The ALF aluminum-plastic film is top-packed and side-packed;

[0023] (3) Inject no less than 0.0001g of liquid into the packaged ALF aluminum-plastic film, and the liquid will react with water vapor to generate gas;

[0024] (4) Final packaging is carried out o...

Embodiment 1

[0028] (1) Die the selected ALF aluminum-plastic film with a thickness of 76 microns to a depth of 2.5 mm, and fix the positive and negative tabs on the corresponding packaging positions;

[0029] (2) Fold the ALF aluminum-plastic film for top packaging and side packaging;

[0030] (3) Inject 2g of electrolyte and 0.05g of water into the packaged ALF aluminum-plastic film;

[0031] (4) Final packaging of the ALF aluminum-plastic film;

[0032] (5) Store the packaged aluminum-plastic film in an environment of 65°C and 90% RH for 30 days, and check the appearance of the ALF aluminum-plastic film every day.

[0033] Generally speaking, the higher the temperature and humidity, the faster the abnormal appearance of the ALF aluminum-plastic film will change, and the abnormality can be taken out. If there is no abnormality within 30 days, it means that the process is good.

[0034] If abnormal phenomena such as liquid leakage or liquid leakage spots are found in the lithium battery...

Embodiment 2

[0036] (1) Die the selected ALF aluminum-plastic film with a thickness of 67 microns to a depth of 2.4 mm, and fix the positive and negative tabs on the corresponding packaging positions;

[0037] (2) Fold the ALF aluminum-plastic film for top packaging and side packaging;

[0038] (3) Inject 1.8g of electrolyte and 0.02g of water into the packaged shell;

[0039] (4) Final packaging of the ALF aluminum-plastic film;

[0040] (5) Store the packaged aluminum-plastic film in an environment of 40°C and 60% RH for 10 days, and check the appearance of the ALF aluminum-plastic film every day.

[0041] If abnormal phenomena such as liquid leakage or liquid leakage spots are found in the lithium battery package or on the surface of the ALF aluminum-plastic film, it means that there is a quality problem in the package and needs to be improved in time.

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Abstract

The invention relates to a detection method for packaging effect of a soft package lithium battery. The detection method comprises the following implementation steps: (1) carrying out shell punching on an ALF aluminum plastic film, and fixing lugs at corresponding positions of a positive lug and a negative lug; (2) carrying out top packaging and side packaging on the ALF aluminum plastic film; (3) injecting no less than 0.0001g of liquid into the packaged ALF aluminum plastic film, reacting the liquid with water vapor to generate gas such as an electrolyte or a mixture of the electrolyte and water, wherein the mass ratio of the electrolyte to water is (1: 0) to (1: 30); (4) carrying out final packaging on remaining side of the ALF aluminum plastic film after liquid injection; and (5) putting the packaged ALF aluminum plastic film in a certain environment for carrying out storage testing; if an appearance abnormity of the ALF aluminum plastic film appears in the storage testing period, or if leaked liquid or surface liquid leakage spots is/are abnormal, the abnormity with quality problem needs to be improved. By using the method disclosed by the invention, the test period for the packaging effect of the lithium battery is greatly shortened, and interference caused by multiple working procedures can be eliminated, so that whether the packaging effect of the lithium battery is good or not can be visually reflected.

Description

technical field [0001] The invention relates to a method for manufacturing a lithium-ion battery, in particular to a method for detecting the encapsulation effect of a soft-pack lithium battery. Background technique [0002] At present, in the field of soft-pack lithium battery manufacturing, the packaging effect is an important factor affecting battery performance. If the encapsulation effect is not good, and the encapsulation cannot completely isolate the positive and negative electrodes and electrolyte inside the battery from the surrounding environment, it will cause water vapor in the environment to enter the inside of the battery, and interact with the positive and negative electrodes, electrolyte and other components inside the battery. The reaction produces gas, which eventually causes the battery to bulge. Although obvious package damage can be detected before leaving the factory, it is difficult to detect ordinary microvias, and the consequences of missed detectio...

Claims

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Application Information

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IPC IPC(8): H01M10/058H01M10/0525H01M2/08G01R31/36H01M50/183
CPCH01M10/0525H01M10/058G01R31/36H01M50/183Y02E60/10Y02P70/50
Inventor 康冬辉屈瑒郝保伟翟羽佳张宏芳贾学恒
Owner TIANJIN LISHEN BATTERY