Lithium battery top cover explosion-proof structure and lithium battery

Abstract

The invention discloses a lithium battery top cover explosion-proof structure and a lithium battery, the explosion-proof structure comprises a top cover, the top cover is provided with an explosion-proof hole, the lower side of the top cover is provided with an explosion-proof film used for sealing the explosion-proof hole, the explosion-proof film is an aluminum- plastic film, and the explosion-proof film is adhered to the lower side of the top cover through heat sealing. And the upper side of the top cover is provided with a protection structure for shielding and protecting the opening partof the explosion-proof hole. The explosion-proof film used for sealing the explosion-proof hole is arranged on the lower side of the top cover, the explosion-proof film is the aluminum-plastic film and is bonded to the lower side of the top cover through heat sealing, when the internal pressure of the battery is too large, heat sealing bonding fails after the explosion-proof film is stressed, andtherefore the pressure relief function is achieved; the upper side of the top cover is provided with the protection structure for shielding and protecting the opening part of the explosion-proof hole,the dust is prevented from getting into the explosion-proof hole, and a foreign object is prevented from piercing through the explosion-proof film; and the explosion-proof structure is simple in production process and low in cost, the overall cost of the lithium battery can be reduced, and the safety performance of the lithium battery can be improved.

Description

technical field

[0001] The invention relates to the technical field of lithium batteries, in particular to an explosion-proof structure for a top cover of a lithium battery and a lithium battery. Background technique

[0002] There is an explosion-proof structure on the top cover of the lithium battery, which is mainly used to automatically open the explosion-proof structure when the internal pressure of the battery is too large to release the internal pressure of the battery. At present, most of the explosion-proof structures on the top cover of lithium batteries are aluminum sheets. Specifically, various shapes of nicks are formed on the aluminum sheet, and then laser welded on the top cover of the battery. When the internal pressure of the battery is too high, the aluminum sheet will be engraved by Crack at the location of the mark to release the pressure. The explosion-proof structure has high processing cost and complicated technological process, which increases the ov...

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