Lithium ion battery aluminum plastic film damage detecting method

Abstract

The invention provides a lithium ion battery aluminum plastic film damage detecting method, which comprises the following steps: (1) detecting liquid preparation: copper chloride, ethyl alcohol, normal butanol, sodium dodecyl benzene sulfonate, polyacrylamide and water are mixed to be prepared into detecting liquid; (2) inspection: an aluminum plastic film to be inspected is put into the detecting liquid prepared in the first step and is soaked for a certain time; then, the change of the surface of the aluminum plastic film is observed; if reddish-brown copper is separated out of the surface of the aluminum plastic film, the condition that the aluminum plastic film is damaged is judged; if no any change occurs on the surface of the aluminum plastic film, the condition that the aluminum plastic film is not damaged is judged. The method has the advantages that the operation is flexible and simple; the cost is low; whether the aluminum plastic film is subjected to mechanical damage or not can be fast and accurately detected, so that the quality of a manufactured battery is ensured; the safety performance of the battery is improved.

Description

technical field [0001] The invention relates to the field of damage detection of aluminum-plastic films, in particular to a method for detecting damage of aluminum-plastic films of lithium-ion batteries. Background technique [0002] As the most widely used rechargeable battery, lithium-ion battery has a history of more than 20 years since its development and application. Like other batteries, lithium-ion batteries are also composed of positive electrodes, negative electrodes, separators, electrolytes, current collectors, and outer casings. The chemical properties of the active components of lithium-ion batteries are very active, and it is easy to catch fire or even explode when placed in the air. Therefore, the packaging shell of lithium-ion batteries should have certain corrosion resistance and very good barrier properties. Currently, the commonly used packaging mainly includes: Steel shell, aluminum shell and polymer aluminum plastic film. The battery is packaged with a...

AI Technical Summary

Problems solved by technology

However, at present, there is no corresponding analysis and testing method at the production end of the aluminum-plastic film in the industry. Once a quality problem occurs in the battery, it is difficult to determine whether it is caused by damage to the CPP / PPA layer of the aluminum-plastic film, and it is also difficult to verify it before making the battery. Whether there is damage to the CPP / PPA layer of the aluminum-plastic film, it is difficult to guarantee the quality of the manufactured battery