Analysis and detection method for micropore failure reasons of soft-pack lithium batteries

Abstract

The invention relates to a method for analyzing and detecting the cause of micropore failure of a soft-packed lithium battery. The specific implementation steps of the method are as follows: first cut off the area containing micropores in the ALF aluminum-plastic film, soak it in the electrolyte, and then place the Store at a temperature of 10°C to 150°C for 1‑60 days; when the polypropylene (PP) layer, nylon layer and other materials in the ALF aluminum-plastic film are separated from the aluminum layer, take out the aluminum layer; then soak the Place the aluminum layer under a microscope to observe whether the micropores are deformed toward the nylon layer, that is, it is determined that it is caused by the foreign matter of the punch particles; or it is deformed toward the PP layer, that is, it is determined that it is affected by external forces during the manufacturing process; That is to say, it is determined that it is caused by the deformation and stretching of the shell, and then the cause of the micropores in the aluminum layer is determined, so as to adjust the lithium battery production process and change the adverse production environment and conditions. The method of the invention is reasonable in design, simple in operation, accurate in analysis and detection, high in reliability, low in cost, high in benefit, and has remarkable application effects.

Description

technical field [0001] The invention relates to a lithium-ion battery manufacturing method, in particular to an analysis and detection method for the micropore failure cause of a soft-pack lithium battery. Background technique [0002] At present, the packaging effect is an important factor affecting the performance of lithium batteries. Factors such as immature punching process, dust particles on the punch, or external forces in the production process may cause ALF (Aluminum Laminated Film) aluminum-plastic film Microporous defects in the aluminum layer are generated on the aluminum layer. [0003] During the use of a lithium battery containing microporous defects in the aluminum layer, water vapor will penetrate into the battery and react with the positive and negative electrodes and electrolyte, causing the lithium battery to bulge. [0004] For the micropores in the aluminum layer found in actual use or storage tests, there is currently no good way to determine whether ...

AI Technical Summary

Problems solved by technology

[0004] For the micropores in the aluminum layer found in actual use or storage tests, there is currently no good way to determine whether the micropores are caused by deformation and stretching of the punching shell, foreign matter of punch dust particles, or external forces during the production process. This has greatly restricted the improvement of the lithium battery production process

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