Lithium ion battery cover plate

Abstract

The invention relates to a lithium ion battery cover plate, and belongs to the technical field of shell batteries. The lithium ion battery cover plate comprises an electrode polar column which is inserted into the battery cover plate fixedly and a liquid injection hole formed on the battery cover plate, wherein the electrode polar column (3) is in a hollow tubular shape which is opened at the bottom end and is closed at the top end, a hollow part in the electrode polar column is in a shape of a structure of which the diameter on the lower part is greater than that on the upper part, and an anti-explosion hole (6) is formed on one side of the upper part; the outer edge on the upper part of the electrode polar column is in a threaded shape, and an elastic sleeve (4) is sleeved on the electrode polar column; and a protective cover (5) is in threaded connection with the outer edge on the upper part of the electrode polar column. The electrode polar column which is in a shape similar to that of a structure of a valve core of a bicycle is inserted into the battery cover plate fixedly, so when the pressure inside a battery is relatively low, the elastic sleeve can prevent air and moisture on the outside from entering a battery shell; and when the air pressure in the battery shell is overhigh, the air passes through the liquid injection hole to deform the elastic sleeve, so the air is released to achieve an anti-explosion effect.

Description

Lithium-ion battery cover technical field The invention relates to a lithium ion battery cover plate, which belongs to the technical field of casing batteries. Background technique Since Sony Corporation of Japan invented and commercialized secondary lithium-ion batteries in 1991, lithium-ion batteries have developed rapidly and their application scope has been expanding. In recent years, lithium-ion batteries have been continuously used in electric bicycles, electric motorcycles, and electric vehicles. , due to the generally large capacity of single cells of power lithium-ion batteries, in order to avoid serious consequences caused by short circuit, overcharge, over discharge, etc. during the use of batteries, single batteries are generally equipped with explosion-proof devices. At present, there are two kinds of explosion-proof devices commonly used in lithium-ion batteries, explosion-proof scoring and explosion-proof valve. The principle of these two explosion-proof dev...

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Problems solved by technology

Aluminum shell batteries generally adopt open-opening formation in the formation process. Since the electrolyte is easy to absorb moisture, it is necessary to control the humidity of the environment during the formation process, which undoubtedly increases the investment of the enterprise and increases the production cost. A large amount of gas, because the liquid injection hole is small, causes the gas to take out the electrolyte when it is discharged from the liquid injection hole. Pollution, resulting in defective battery appearance, in addition, the battery capacity may be low due to the loss of electrolyte

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