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A detection method for corrosion of aluminum-plastic film of flexible packaging lithium-ion battery

A lithium-ion battery and detection method technology, which is applied in the directions of measuring devices, measuring electrical variables, and optical testing for flaws/defects, can solve the problems of undetectable batteries and the inability to specify the location of batteries, etc., so as to improve the detection rate of measurement and improve Yield rate, effect of accelerated corrosion reaction

Inactive Publication Date: 2017-06-16
SHANDONG QIXING NEW ENERGY SCI & TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method can only detect batteries that have been corroded. The CPP layer is damaged but not corroded. The resistance of the battery shell exceeds 1MΩ. The battery with potential corrosion cannot be detected, and the location of the battery corrosion cannot be specified.

Method used

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  • A detection method for corrosion of aluminum-plastic film of flexible packaging lithium-ion battery
  • A detection method for corrosion of aluminum-plastic film of flexible packaging lithium-ion battery
  • A detection method for corrosion of aluminum-plastic film of flexible packaging lithium-ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] A method for detecting corrosion of aluminum-plastic film of a flexible package lithium-ion battery, comprising steps as follows:

[0030] (1) Calculate the shell resistance value of the negative pole piece and the aluminum layer of the aluminum-plastic film, and use the scale of the finished battery as shown in Table 1

[0031] Substituting inches into the formula for calculation: the resistivity between the negative pole piece and the aluminum layer of the aluminum-plastic film = 1*10 7 Ω cm;

[0032] Table 1 Dimensions of Negative Electrode Sheets for Experimental Batteries

[0033]

[0034] Shell resistance value=(shell resistance value=(resistivity between negative pole piece and aluminum-plastic film aluminum layer*negative pole piece width) / (negative pole piece thickness*negative pole piece length)={10 7 *8.35 / (0.0127*104.2)}*10- 6 =63MΩ

[0035] (2) Put the finished battery in the oven, vacuumize it for 20 minutes, the vacuum degree is -80KPa, and then pa...

experiment example

[0044] For the lithium-ion battery produced after the improved shelling process as described in Example 1, follow the steps (1) and (2) described in Example 1, and count the detection rate of defective products with low shell resistance values.

[0045] Table 2 Example 1, Comparative Examples 1-2 and Experimental Example Measure the shell resistance value defective product detection rate of the same number of batteries

[0046]

[0047] By comparing the data in Table 2, it can be seen that the method of vacuuming and nitrogen replacement and then high-temperature storage has an important impact on the detection rate of the present invention, and the method mentioned in the present invention has a higher detection rate of defective products. After the improvement of the production process is guided by analyzing the damaged position of the CPP layer, the ratio of defective products is greatly reduced, which shows that the method is highly effective and is conducive to the impr...

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Abstract

The invention relates to a detection method for flexible package lithium ion battery aluminum plastic film corrosion. Firstly, the shell resistance value of a specific type battery is worked out according to the specific resistance between a negative electrode piece and an aluminum plastic film and the size of the negative electrode piece; then, the surface of the aluminum plastic film is covered with electrolyte acceleratedly in a vacuumizing and high-temperature storage mode, the electrolyte is promoted to make contact with a naked aluminum layer at a damaged position of an aluminum plastic CPP layer, the weak positions, caused by the external force, of the CPP layer are exposed more easily, the insulating performance of the aluminum plastic film is reduced, and the recall factor of corrosion hazard behaviors of the aluminum plastic film is increased; then, the shell resistance between the negative electrode piece and the aluminum plastic film aluminum layer is measured through a multimeter, and defective products with the low shell resistance are screened; finally, the damage position of the aluminum plastic film CPP layer of the battery with high shell resistance is detected in a chemical corrosion and dye penetrant inspection permeation mode. According to the detection method, the production process can be guided to be modified, the situation that same questions continue to occur is avoided, and the yield of a battery production manufacturer is increased.

Description

technical field [0001] The invention relates to a method for detecting corrosion of aluminum-plastic films of soft-packaged lithium-ion batteries, in particular to a method for detecting corrosion positions of aluminum-plastic films of soft-packaged lithium-ion batteries, and belongs to the technical field of lithium-ion battery manufacturing. Background technique [0002] The aluminum-plastic film for lithium-ion batteries in flexible packaging is mainly composed of aluminum layer + PP (polypropylene) layer + nylon layer, and an adhesive agent between the layers. Improper protection and improper operation of the aluminum-plastic film will cause damage to the appearance of the aluminum-plastic film, resulting in abnormal phenomena such as pits, scratches, wrinkles, stretching of the aluminum-plastic film, and poor packaging. Since the aluminum-plastic film packaging process is thermally polymerized through the CPP (cast polypropylene) layer, the packaging effect is greatly a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R27/02G01N21/91
CPCG01N21/91G01R27/02
Inventor 刘亚明王艳飞黄磊周朕良张妍郭大利杨飞雪
Owner SHANDONG QIXING NEW ENERGY SCI & TECH CO LTD
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