Explosion-proof structure of cylindrical battery

Abstract

The invention relates to the technical field of battery structures and manufacturing, in particular to an explosion-proof structure of a cylindrical battery. The structure comprises a convex explosion-proof cap and a battery cell shell; the convex explosion-proof cap comprises an upper cover and a lower cover; the upper end of the battery cell shell is buckled with the edge of the upper cover towards the inner ring edge; the lower cover comprises a stainless iron sheet and a bottom cover connected with the positive electrode leading-out end; the edge of the upper end of the bottom cover is buckled with the edge of a stainless iron sheet towards the inner ring edge; the upper cover is composed of an upper boss, a middle ring step edge and a lower ring step edge which are concentric; and vent holes are evenly distributed in the middle ring step edge; an explosion-proof membrane is arranged between the bottom cover and the stainless iron sheet; and the explosion-proof membrane and the shell enclose the battery cell in a closed space. The explosion-proof membrane sequentially comprises a polyethylene terephthalate (PET) layer, an aluminum layer, a polyethylene (PE) layer and a hot meltadhesive layer. The structure can prevent serious accidents such as explosion, fire and the like.

Description

technical field [0001] The invention relates to the field of battery structure and manufacturing technology, in particular to an explosion-proof structure of a cylindrical battery. Background technique [0002] With the rapid development of science and technology, we use electronic products more and more frequently in our daily life. Cylindrical lithium batteries are widely used to provide electrical energy for various electronic products. Cylindrical lithium batteries have many advantages such as high voltage platform, high storage energy density, light weight, long service life, and environmental protection, but there is also the problem of poor safety that cannot be ignored. When the cylindrical lithium battery is charged with overvoltage and overcurrent or used for a long time, it may explode or spontaneously ignite due to a short circuit, causing a safety hazard. Contents of the invention [0003] Aiming at the above-mentioned technical defects, the present invention...

AI Technical Summary

Problems solved by technology

When the battery core has problems such as overcurrent, voltage or long service life and overheating, the internal pressure in the confined space rises sharply, and the explosion-proof film based on aluminum base quickly breaks down, and the heat in the battery core is discharged in time to prevent explosion, fire and other vicious the occurrence of the accident

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