Cylindrical battery cap

Abstract

The invention discloses a cylindrical battery cap which comprises an installation seat and a cap portion. The cap portion comprises a top cover, a conductive anti-explosion membrane, a conductive padand an insulating ring, the top cover is arranged on the upper portion of the conductive anti-explosion membrane, a circumferential portion of the conductive anti-explosion membrane contacts with a circumferential portion of the top cover in an encircling manner, the top cover is provided with a first vertically-penetrated through hole, the conductive anti-explosion membrane is provided with an anti-explosion line which can be cracked when the pressure in a cylindrical battery is increased, the conductive pad is provided with a second vertically-penetrated through hole and is arranged on the lower portion of the conductive anti-explosion membrane, a non-circumferential portion of the conductive anti-explosion membrane and a non-circumferential portion of the conductive pad are at least locally and fixedly connected together, and the insulating ring is arranged between the circumferential portion of the conductive anti-explosion membrane and the circumferential portion of the conductivepad. The cylindrical battery cap has the advantages that ignition of the battery is prevented, the air pressure in the battery is more accurately controlled, and the sealing performance of the battery cap is good.

Description

technical field [0001] The invention belongs to the technical field of lithium batteries and lithium battery applications, and in particular relates to a cylindrical battery cap structure. Background technique [0002] With the advancement of science and technology, the application field of lithium batteries is further expanding. From mobile phone batteries, electric bicycle batteries, to hybrid electric vehicle batteries, lithium batteries are used everywhere, and cylindrical batteries are used in these applications. Cylindrical batteries usually consist of a steel case, a circular cap, positive and negative electrodes, electrolyte, etc. In the prior art, the battery cap includes two commonly used structures: [0003] One is the method of battery cover. The specific structure is to set a circle of explosion-proof wires on the front cover and the rear cover. Its disadvantage is that when the battery is assembled and used by ultrasonic welding, ultrasonic welding will destroy...

AI Technical Summary

Problems solved by technology

[0003] One is the method of battery cover. The specific structure is to set a circle of explosion-proof wires on the front cover and the rear cover. Its disadvantage is that when the battery is assembled and used by ultrasonic welding, ultrasonic welding will destroy the structure of the explosion-proof wire. , resulting in battery leakage and explosion-proof pressure not meeting battery requirements;

[0004] The other is a simple method. The specific structure is to attach a layer of PP material inside the front cover. Its disadvantages are: poor sealing performance and difficult control of internal air pressure

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