A kind of nylon film for aluminum-plastic film composite of lithium battery and preparation method thereof

Abstract

The invention provides a nylon film for lithium battery aluminum-plastic film composite and a preparation method thereof, wherein, the film layer structure of the nylon film for lithium battery aluminum-plastic film composite includes a stacked upper surface layer, a core layer and a lower surface layer; the upper surface layer Or the surface of the lower surface layer is coated with an electrolyte-resistant coating; the upper surface layer components: 59-83 parts of semi-aromatic nylon, 10-20 parts of long carbon chain nylon, 5-10 parts of toughening agent, 1-8 parts of additives ; Core layer components: 65.5 to 83.5 parts of semi-aromatic nylon, 10 to 20 parts of long carbon chain nylon, 5 to 10 parts of toughening agent, 0.5 to 1.5 parts of heat stabilizer, 4 to 15 parts of black nylon masterbatch, 1 ~3 parts of compatibilizer; lower surface layer components: 59~83 parts of semi-aromatic nylon, 10~20 parts of long carbon chain nylon, 5~10 parts of toughening agent, and 1~8 parts of additives. The nylon film for lithium battery aluminum-plastic film composite has excellent heat resistance and electrolyte resistance, and at the same time helps to identify appearance defects caused by the aluminum-plastic film manufacturing process, and ensures the service life of the lithium battery.

Description

technical field [0001] The invention relates to the technical field of lithium battery packaging materials, in particular to a nylon film for lithium battery aluminum-plastic film composite and a preparation method thereof. Background technique [0002] Lithium battery flexible packaging is more and more widely used due to its light weight and high safety. Its main structure is composed of a protective layer, an aluminum foil layer and a heat-sealing layer. Usually, the protective layer is a biaxially stretched nylon film, and the heat-sealing layer It is cast polypropylene (CPP). Patent CN107538875A provides a nylon film that can be used for the outer packaging of lithium-ion batteries, which has the characteristics of stamping resistance, low hygroscopicity, chemical resistance, and excellent performance. [0003] Although the existing nylon films have quite excellent properties, there is still room for improvement. In actual use, the electrolyte of lithium batteries wil...

AI Technical Summary

Problems solved by technology

In actual use, the electrolyte of lithium batteries will produce highly corrosive hydrofluoric acid when it meets water. Once the outermost protective layer is damaged, it will cause defective products.

The protective layer of the aluminum-plastic film of the existing lithium battery is generally a transparent film layer, and the appearance defects generated during the manufacturing process of the aluminum-plastic film are not easy to be found, such as shell damage and small cracks, and there are potential safety hazards, especially with When used on the power battery of new energy vehicles; due to the long-term use of lithium batteries, it is easy to generate high temperature and heat, which will consume the battery life, and even have the risk of explosion at high temperature

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