Method for selecting lithium battery aluminum plastic films

Abstract

The invention discloses a method for selecting lithium battery aluminum plastic films. The method comprises the following steps of: determining optimal heat sealing conditions of aluminum plastic films of different factories through a single factor experiment; then manufacturing the aluminum plastic films into aluminum plastic film bags with the same specification through heat sealing according to the optimal heat sealing conditions; independently testing electrolyte corrosiveness resistance and water resistance of the manufactured aluminum plastic film bags; calculating according to test data to obtain heat sealing strength reduction rates Q, weight reduction rates Z and water content increment rates S; and selecting the aluminum plastic films in sequence as lithium battery packaging materials according to the sequence from small to large of the weight reduction rates Z, the water content increment rates S and the heat sealing strength reduction rates Q. The method is convenient to operate, free of special requirements on materials and equipment, high in feasibility, accurate in selection result and high in selection efficiency.

Description

technical field [0001] The invention relates to the technical field of lithium battery manufacturing, in particular to a method for selecting aluminum-plastic films of lithium batteries. Background technique [0002] The green, high-energy and environment-friendly lithium-ion battery that appeared in the 1990s has become one of the most eye-catching automotive power sources due to its advantages such as high energy density, long cycle life, and high operating voltage. Packaging is an indispensable and important part of lithium batteries. Lithium batteries cannot exist independently without packaging. The service life of packaging is the same as that of lithium batteries. failure process. [0003] At present, the outer packaging of vehicle batteries can be divided into four types: plastic shell, steel shell, aluminum shell and aluminum-plastic film. Aluminum-plastic film material has become one of the main packaging materials for automotive lithium batteries due to its advan...

AI Technical Summary

Problems solved by technology

[0009] The present invention aims to overcome the shortcomings of the existing aluminum-plastic film selection technology, such as single selectivity, inaccurate selection results, and the inability to systematically select aluminum-plastic films with excellent performance as lithium battery packaging materials, and provides a convenient and feasible method. Strong, can quickly and quantitatively select aluminum-plastic films with excellent performance as lithium battery packaging materials. Lithium battery aluminum-plastic film selection method

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