Explosion-proof valve of lithium ion storage battery

Abstract

The invention discloses an explosion-proof valve of a lithium ion storage battery with a simple structure and high safe reliability, which comprises a valve body (1), a needle body (2) and an explosion-proof film (3). The valve body (1) is provided with a vent hole (4); the needle body is fixedly connected to the upper end of the vent hole (4); a lower surface of the needle body (2) is provided with a conical contact probe (5); the explosion-proof film (3) is arranged at the lower end of the vent hole (4), and is hermetically assembled with the valve body (1); and the conical contact probe (5) points to the explosion-proof film (3) which is prepared from ethylene-propylene diene rubber as a raw material, has good elasticity and larger thickness, and is difficult to crack. Compared with the existing explosion-proof valve prepared from metal materials such as a copper foil, an aluminum foil and the like, the explosion-proof valve of the lithium ion storage battery greatly improves safe reliability of the battery and prolongs the service life of the battery.

Description

technical field [0001] The invention relates to an explosion-proof valve for a lithium ion storage battery. Background technique [0002] Since the 21st century, people have placed more and more strong hopes on the progress of new energy technologies to alleviate the tension of non-renewable resources such as oil. Lithium-ion batteries are particularly favored due to their large energy ratio and compliance with environmental protection requirements, but the safety of lithium-ion batteries is a major concern that people generally pay attention to. Ordinary lithium-ion batteries mainly use scoring, welding explosion-proof film and other methods as the explosion-proof device of the battery. The internal temperature of the battery will increase the air pressure. When the pressure increases to a certain level, the explosion-proof device will be desoldered or ruptured to avoid battery explosion. Advanced explosion-proof devices cannot accurately control the pressure that destroys...

AI Technical Summary

Problems solved by technology

Ordinary lithium-ion batteries mainly use scoring, welding explosion-proof film and other methods as the explosion-proof device of the battery. The internal temperature of the battery will increase the air pressure. When the pressure increases to a certain level, the explosion-proof device will be desoldered or ruptured to avoid battery explosion. The explosion-proof device cannot accurately control the pressure that destroys the explosion-proof device, and the start-up pressure value is also relatively large. Often, when the battery reaches the rated pressure, it cannot achieve air release and pressure relief, resulting in accidents.

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