Corrosion-prevention and compression-resistant lithium battery shell and production method therefor

Abstract

The invention provides a corrosion-prevention and compression-resistant lithium battery shell. The lithium battery shell is characterized by comprising an aluminum layer, a parylene layer and a hard anti-scratch layer, wherein the aluminum layer is manufactured into the main body part of the battery shell; the parylene layer is plated on the outer side of the aluminum layer, and then the aluminum layer is coated with the hard anti-scratch layer; and the parylene layer is plated on the inner side of the aluminum layer. The corrosion-prevention and compression-resistant lithium battery shell has the beneficial effects that the service life of the lithium battery is greatly prolonged, the probability of bulging, capacity fading and other abnormal accidents in the use process of the lithium battery is lowered, the cracked area of the battery shell after the battery is extruded is decreased, the contact area between a cell and external oxygen is decreased, and the safety of the lithium battery in use is improved.

Description

Technical field [0001] The invention relates to a battery casing, in particular to an anticorrosive and pressure resistant lithium battery casing and a production method thereof. Background technique [0002] Lithium batteries are widely used in electronics, communications, power tools, electric vehicles, energy storage, aerospace and other fields due to their high specific energy, good safety, long cycle life, and environmental friendliness. Lithium-ion battery includes battery case and positive electrode, current collector, separator, electrolyte and negative electrode in the battery case. The battery case is mainly used to protect the internal cells of the battery and prevent external oxygen and moisture from contacting the internal electrodes and electrolyte of the battery. . Most of the existing lithium battery shells use metal shells such as steel shells and aluminum shells, aluminum-plastic film flexible packaging shells or plastic shells, but the metal shells are heavy i...

AI Technical Summary

Problems solved by technology

Most of the existing lithium battery shells use metal shells such as steel shells and aluminum shells, aluminum-plastic film flexible packaging shells, or plastic shells, but metal shells are heavy, and have poor corrosion resistance and electrical insulation; although plastic shells are light in weight and durable Corrosion and electrical insulation are good, but because the material used in the battery shell is a modified polymer material, this polymer material is affected by the mobility of the polymer segment and the free volume of the molecular segment, and its impact on external moisture and oxygen The barrier property of the battery is not good, so that the battery is prone to bulging and electrode corrosion; although the aluminum-plastic film flexible packaging shell has good barrier property, it is not suitable for large-capacity power lithium batteries

Images