Explosion-proof valve structure for pressure relief of lithium battery

Abstract

The invention discloses an explosion-proof valve structure for pressure relief of a lithium battery, and the explosion-proof valve structure comprises a cover plate. The explosion-proof valve structure is characterized in that a blast hole is formed in one side of the cover plate; a thin-wall blast film is arranged at the bottom of the blast hole; the thin-wall blast film and the cover plate are of an integrated structure, and a blast groove is formed in the blast film. The explosion-proof valve structure has the advantages of simple structure, good sealing performance, safety and reliability because the blast film and the cover plate are of an integrated structure; the cross blast groove is formed in the blast film, so that gas in the lithium battery can conveniently break through the blast film, and explosion caused by excessive internal pressure of the battery is avoided; compared with a common blast film, the blast film of the cross blast groove is thicker, is convenient to produce and is difficult to damage in a transportation process, and additionally, the anti-explosion pressure is easy to control.

Description

technical field [0001] The invention relates to the explosion-proof technical field of lithium batteries, in particular to a pressure relief explosion-proof valve structure for lithium batteries. Background technique [0002] With the development of the electric vehicle industry, the demand for large-capacity, high-rate lithium-ion batteries is increasingly urgent, but the larger the capacity, the higher the charge-discharge rate, and the greater the challenge to safety. When lithium-ion batteries are used in When the internal temperature of the battery rises due to abuse such as short circuit and overcharge, a series of side reactions will occur inside the battery, which will not only make the battery invalid, but may also cause an explosion. [0003] In order to prevent the battery from exploding due to the high internal pressure of the battery, an explosion-proof valve is usually installed on the cover of the lithium-ion battery. , At the same time, the manufacturing pre...

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Problems solved by technology

[0002] With the development of the electric vehicle industry, the demand for large-capacity, high-rate lithium-ion batteries is increasingly urgent, but the larger the capacity, the higher the charge-discharge rate, and the greater the challenge to safety. When lithium-ion batteries are used in When the internal temperature of the battery rises under abuse conditions such as short circuit and overcharge, a series of side reactions will occur inside the battery, which will not only make the battery invalid, but may also cause an explosion

[0003] In order to prevent the battery from exploding due to the high internal pressure of the battery, an explosion-proof valve is usually installed on the cover of the lithium-ion battery. , at the same time, the manufacturing precision of the membrane is relatively high, and the explosion-proof pressure is not easy to control

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