Lithium battery packaging film with high barrier, acid resistance and alkali resistance

Abstract

The invention discloses a lithium battery packaging film with high barrier, acid resistance and alkali resistance, which is manufactured through the following steps of: using a special aluminum alloy aluminum layer as an intermediate base layer, thermally processing the aluminum alloy aluminum layer, respectively plating a layer of functional nanometer silicon material on the upper and lower surface layers of the aluminum alloy aluminum layer, thermally processing through a special process, processing an inner layer and an outer layer with a nanometer barrier and an insulating coating liquid twice; and attaching a layer of high-strength nylon layer to the outer layer of the aluminum alloy aluminum layer, and attaching a layer of polypropylene layer made from nanometer macromolecular materials to the inner layer of the aluminum alloy aluminum layer. By adequately adopting the extreme flexibility, ductility performance, extremely high corrosion resistance and barrier performance of alloy aluminum foil after the alloy aluminum foil is functionally processed, the manufactured lithium battery packaging film has excellent performances such as excellent insulation, cold punching resistance, corrosion resistance, high barrier, high strength and the like.

Description

technical field [0001] The invention relates to an electrolyte packaging film used for lithium batteries such as automobiles, mobile phones, and computers, in particular to a lithium battery packaging film with high barrier and acid and alkali resistance. Background technique [0002] Chinese patent (patent number: ZL02163383.6) discloses a lithium battery flexible packaging film based on an ordinary aluminum layer, the inner layer of polycaprolactam or polyhexamethylene adipamide layer, and the outer layer of ordinary biaxial stretching Nylon layer, and other similar utility model patents, they currently have common functional defects as follows: 1. The aluminum layer is easily broken when it is formed by cold stamping, causing electrolyte leakage. 2. The barrier performance is poor. Due to the difference in tensile properties between the nylon layer and the aluminum foil layer, the nylon layer and the aluminum layer are easily delaminated during cold stamping, resulting in...

AI Technical Summary

Problems solved by technology

[0002] Chinese patent (patent number: ZL02163383.6) discloses a lithium battery flexible packaging film based on an ordinary aluminum layer, the inner layer of polycaprolactam or polyhexamethylene adipamide layer, and the outer layer of ordinary biaxial stretching Nylon layer, and other similar utility model patents, they currently have common functional defects: 1. The aluminum layer is easily broken when it is formed by cold stamping, causing electrolyte leakage

2. The barrier performance is poor. Due to the difference in tensile properties between the nylon layer and the aluminum foil layer, the nylon layer and the aluminum layer are easily delaminated during cold stamping, resulting in a decrease in barrier performance

3. Insufficient insulation and corrosion resistance treatment of the aluminum layer leads to poor insulation performance of the molded flexible packaging film, which is prone to inner layer flatulence or breakdown by electrodes

High battery scrap rate and short service life

The existence of the above main functional defects is the main reason why lithium flexible packaging films have not been widely used in the market

Images