Explosion-proof housing of battery

Abstract

The invention discloses an explosion-proof housing of a battery. The explosion-proof housing comprises a combined battery explosion-proof cover and an explosion-proof steel shell, wherein the combined battery explosion-proof cover is pressed into the upper part of the explosion-proof steel shell; the combined battery explosion-proof cover comprises a seal ring, a head cover, an explosion-proof sheet, an insulating ring and a pore plate; the head cover is clamped into one surface of the explosion-proof sheet; a cylindrical bump structure is arranged on the other surface of the explosion-proof cover; a conical bump is also arranged on the top part of the bump structure; a groove is formed between the cylindrical bump and an outer ring of the explosion-proof sheet; the insulating ring is located on the outer ring of the bump structure; the pore plate covers the insulating ring and is welded with the conical bump of the explosion-proof cover; and the explosion-proof sheet is arranged into the seal ring and is fixed to the seal ring through gel. Due to the design of the groove in the explosion-proof sheet, the explosion-proof sheet can be better combined with the seal ring; the probability of battery leakage is significantly reduced; and the explosion-proof housing of the battery has a technical progress in the field.

Description

Technical field [0001] The invention relates to the field of batteries, in particular to a battery explosion-proof casing with good explosion-proof performance and liquid leakage prevention. Background technique [0002] At present, lithium batteries are usually used in multiple series and parallel combinations. Therefore, the total energy of the battery is relatively large. During the charging process, there is a hidden danger of overcharge of a single battery or overcharge of the entire battery pack. When the lithium battery is overcharged, the battery The voltage rises rapidly with the increase of polarization, which will cause irreversible changes in the structure of the positive electrode active material and decomposition of the electrolyte, generating a large amount of gas and releasing a large amount of heat, causing the battery temperature and internal pressure to increase sharply, and there are hidden dangers such as explosion and combustion. The safety of lithium batter...

AI Technical Summary

Problems solved by technology

At this time, if the internal temperature of the battery has reached the state of thermal runaway, the internal pressure of the battery will continue to rise, the explosion-proof film of the battery cap will be broken, and the material in the battery will be ejected with the high-pressure gas. The existing explosion-proof cap still has the problem of easy leakage.

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