External packing material of soft pack batteries and preparation method thereof, and external packing film and soft pack battery

Abstract

The invention relates to the field of battery materials, and specifically provides an external packing material of soft pack batteries and a preparation method thereof, and an external packing film and a soft pack battery. The external packing material includes a barrier material layer and a composite plastic layer which are in fitting arrangement; and the raw materials of the composite plastic layer include SAN, CPE and MBS. The barrier material layer can prevent water absorption and liquid leakage, so that the barrier material layer can have good corrosion resistance; the composite plastic layer has a certain intensity and impact resistance, good heat resistance and good electrical insulation; the external packing material is obtained by two materials through fitting and fully combines the advantages of the two; and through the provided preparation method, the external packing material can be obtained after the composite plastic layer is prepared on the surface of the barrier material layer or obtained after the fitting of the barrier material layer and the composite plastic layer.

Description

technical field [0001] The invention relates to the field of battery materials, in particular to an outer packaging material for a soft-pack battery, a preparation method thereof, an outer packaging film, and a soft-pack battery. Background technique [0002] At present, batteries with electrolytes generally use plastic as the battery casing material. Since plastic is cheaper than aluminum as the battery casing material, plastic is currently preferred to be used as the battery casing material. However, there are many problems in the batteries prepared by using the existing plastic as the shell material of the battery, such as: the plastic case battery is prone to leakage after being used for a period of time, and the electrolyte of the general plastic case battery after two years of use It will lose 5-15%, which seriously affects the service life of the battery; at the same time, the plastic material has low impact resistance, and it cannot resist small bumps and bumps, and ...

AI Technical Summary

Problems solved by technology

[0006] The first purpose of the present invention is to provide an outer packaging material for soft pack batteries, so as to alleviate the problem that the outer packaging materials used in the prior art for preparing soft pack batteries cannot simultaneously have certain strength and impact resistance, and have better heat resistance. properties, lower water absorption, better electrical insulation and better corrosion resistance

Images