Safe and anti-explosion cover plate for power lithium battery

Abstract

The invention relates to a safe and anti-explosion cover plate for a power lithium battery. The safe and anti-explosion cover plate for the power lithium battery comprises a cover plate base plate with an anti-explosion hole, an anti-explosion valve running through the anti-explosion hole as well as a positive pole column and a negative pole column which are arranged on the cover plate base plate sequentially; the anti-explosion valve comprises a hollow anti-explosion main body, a valve cover sheet arranged at the opening position of the upper end of the anti-explosion valve main body, an anti-explosion film sheet arranged at the opening position of the lower end of the anti-explosion valve main body, a sealing sheet arranged at the middle section in the anti-explosion valve main body as well as a spring connected between the valve cover sheet and the sealing sheet; and a through hole is formed in the valve cover sheet. The safe and anti-explosion cover plate for the power lithium battery can guarantee the sealing property of the battery, also can reduce the use risk of the low lithium battery, and has the characteristics of reasonable structure, high safety, high sealing property, simplicity in manufacturing and the like.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a safety explosion-proof cover plate for power lithium batteries. Background technique [0002] Using an explosion-proof cover on a lithium-ion battery can improve the safety performance of the battery. The explosion-proof cover plate on the existing lithium-ion battery includes a base plate arranged on the top of the lithium-ion battery. The base plate is provided with an explosion-proof hole. Generally, the explosion-proof film is sealed to the explosion-proof hole by welding, and most of the explosion-proof films are made of copper foil. sheet or aluminum sheet. During the use of the lithium-ion battery, when the battery is overcharged or short-circuited, gas will be generated inside the battery, and the battery air pressure will rise. When the air pressure exceeds the set pressure of the explosion-proof membrane, the explosion-proof membrane will rupture, and...

AI Technical Summary

Problems solved by technology

However, after the explosion-proof membrane is broken, the inside of the battery is connected to the outside world, and oxygen and moisture in the air can easily enter the battery, causing the charged negative electrode to oxidize, increasing the temperature of the battery and increasing the risk of thermal runaway of the battery

Images