Upper cover assembly of lithium battery

Abstract

The invention discloses an upper cover assembly of a lithium battery. The upper cover assembly comprises an upper cover body, a positive electrode post, a negative electrode post, a positive electrode gasket, a negative electrode gasket, an anti-explosion valve and a protection film, wherein the positive electrode post and the negative electrode post are arranged at the left and right ends of the upper cover body respectively; the positive electrode gasket and the negative electrode gasket are arranged at the bottom of the upper cover body, and are corresponding to the positions of the positive electrode post and the negative electrode post respectively; the anti-explosion valve is arranged on the upper cover body and positioned between the positive electrode post and the negative electrode post; the anti-explosion valve adopts a circular structure; and the protection film is adhered to the upper part of the anti-explosion valve. By adoption of the mode, the upper cover assembly of the lithium battery is simple in structure and provided with the anti-explosion valve, and the protection film is adhered to the upper part of the anti-explosion valve, so that the upper cover assembly has a relatively good anti-explosion performance and high safety; and therefore, an explosion phenomenon when the lithium battery is over-charged can be fully avoided.

Description

technical field [0001] The invention belongs to the technical field of lithium batteries, and in particular relates to a lithium battery upper cover assembly. Background technique [0002] Lithium batteries have the advantages of high voltage, long life, high energy density, and portability, and their application fields are also expanding, but their safety is worse than other secondary batteries. When the power lithium battery is overcharged, its internal electrolyte, etc. The material will be cracked to produce gas, which will cause the battery shell to bulge and rupture, allowing oxygen to enter and react with the lithium ions accumulated on the surface of the negative electrode, and then explode. Contents of the invention [0003] The technical problem mainly solved by the present invention is to provide a lithium battery upper cover assembly, which has a simple structure and is equipped with an explosion-proof valve. Explosion phenomenon when the battery is overcharge...

AI Technical Summary

Problems solved by technology

[0002] Lithium batteries have the advantages of high voltage, long life, high energy density, and portability, and their application fields are also expanding, but their safety is worse than other secondary batteries. When the power lithium battery is overcharged, its internal electrolyte, etc. The material will be cracked to produce gas, which will cause the battery case to bulge and rupture, allowing oxygen to enter and react with lithium ions accumulated on the surface of the negative electrode, resulting in an explosion

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