Gigohm-level anti-explosion and combustion-proof cover cap of power battery

Abstract

The invention relates to a gigohm-level anti-explosion and combustion-proof cover cap of a power battery. The gigohm-level anti-explosion and combustion-proof cover cap comprises an upper cover cap, an anti-explosion membrane with a wall body, a perforated plate, an inner sealing ring and an outer sealing ring, wherein the upper cover cap is arranged on the upper end face of the anti-explosion membrane and is inwards bent and pressed from the wall body in a state of being ultrasonically welded on the upper end face of the upper cover cap by multiple points; a plurality of air holes are uniformly formed in the upper cover cap; a turnover prestress release buckle connected to the upper cover cap is arranged in each air hole; the lower end face of the anti-explosion membrane is welded with the perforated plate; the outer sealing ring is glued to cover the outer walls of the upper cover cap and the anti-explosion membrane; the upper and lower edges of the outer sealing ring are inwards bent and glued to press the upper cover cap or the upper end face of the bent wall body of the anti-explosion membrane and the lower end face of the anti-explosion membrane. The gigohm-level anti-explosion and combustion-proof cover cap is characterized in that a plurality of pressure release lines respectively corresponding to the multiple turnover prestress release buckles are uniformly distributed on the anti-explosion membrane; the pressure release lines are non-closed single arc-shaped curves, or two or more than two pressure release lines with structures intersected at one point.

Description

technical field [0001] The invention relates to a battery cap, in particular to a micro-resistance, non-explosive, non-combustible, high-current cylindrical lithium-ion power battery Geo-level anti-explosion and anti-combustion cap. Background technique [0002] The power battery cap is a key component of the power battery, also known as a high-current lithium-ion battery. It is directly related to the battery's safety performance, capacity, service life, safe passage of high current, production and use safety of producers and users. The existing cylindrical power battery cap mainly consists of an upper cap, a gasket, an explosion-proof membrane with a wall, a sealing ring, and an orifice plate. When such a cap is charged and discharged at a high rate of battery activation or when the battery is abnormal, the gasket will heat up severely, and the ability of the explosion-proof membrane to seal the circular pressure relief ring to pass the current cross-sectional area is seve...

AI Technical Summary

Problems solved by technology

[0005]In order to solve the problem that the explosion-proof film of the power battery cap in the prior art cannot be normally opened to release the pressure, the internal resistance of the cap is unstable, and the instantaneous large current cannot be passed smoothly, and the use of large current Severe heat generation, easy combustion of the battery, short service life, and when the cap is produced normally and the cap is packaged with the steel shell, the explosion-proof film of the cap is easily deformed and broken, the explosion-proof film and the orifice plate are misplaced and broken, resulting in scrapping of the battery, and the superimposed deformation of the explosion-proof film causes the battery to explode. Combustible and other disadvantages, the purpose of the present invention is to provide a Giga-level explosion-proof power battery with stable internal resistance, long service life, no deformation and dislocation, stable explosion-proof performance, safe production and use burning cap

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