High-plasticity lithium battery soft package film and preparation method thereof

Abstract

The invention relates to a high-plasticity lithium battery soft package film and a preparation method thereof. The high-plasticity lithium battery soft package film comprises an aluminum foil layer, wherein a PVDF (Polyvinylidene Fluoride) film layer is compounded on the upper surface of the aluminum foil layer through a weather-resistant glue layer; and an ordinary PET (Polyethylene Terephthalate) film layer is compounded on the lower surface of the aluminum foil layer through an adhesive layer. According to the high-plasticity lithium battery soft package film disclosed by the invention, the PVDF film layer and the PET film layer are compounded on the two surfaces of the aluminum foil layer by adopting a thermal compounding process, so that the high-plasticity lithium battery soft package film is small in overall thickness, is light, and has high ductility; the modified acid and alkali resistant PET film is taken as an inner layer, so that excellent heat sealing performance, excellent peeling strength and excellent chemical resistance are provided for a lithium battery, and an aluminum foil is effectively protected from being corroded by electrolyte; the PVDF film layer is taken as an outer layer, so that the aluminum foil is protected from being damaged by external hard objects and the like; and the high-plasticity lithium battery soft package film disclosed by the invention can be made into lithium battery shells of various sizes and shapes through a cold press molding process, so that the application range of the high-plasticity lithium battery soft package film is expanded greatly.

Description

technical field [0001] The invention relates to a high plasticity lithium battery soft package film and a preparation method thereof. Background technique [0002] Lithium-ion battery is a new generation of green and high-efficiency battery, which has the characteristics of high voltage, high energy density, good cycle performance, small self-discharge, no memory effect, and wide working range. It is now widely used in mobile communications, notebook computers, digital Cameras, video cameras, portable instruments, and electric vehicles (electric cars, electric bicycles, etc.), have very bright application prospects in green transportation, portable equipment, and energy storage batteries. In recent years, the production capacity of lithium batteries in the world has grown rapidly, and the application fields have continued to expand. It has become a high-tech product that is of great significance to the national economy and people's lives in the 21st century. [0003] Becaus...

AI Technical Summary

Problems solved by technology

Due to problems such as CPP is easy to scratch and PA has poor flattening ability, the related production technology has been monopolized by foreign companies.

Domestic lithium battery companies all rely on imports for soft-coated films, which has caused many problems such as high manufacturing costs, long procurement cycles, difficult rights protection, and insecure material demand.

Images