Current collector for battery

Abstract

The invention discloses a current collector for a battery. A sealing ring comprises a central cylinder for inserting a conductor nail, a periphery tightly bonded with an internal wall of a battery casing, and a connecting part positioned between the central cylinder and the periphery; air release holes are formed in a cathode bottom cover; the connecting part comprises an annular main body; an explosion-proof structure is arranged on the annular main body, and arranged at the root of a joint of the annular main body and the central cylinder, a space defined by the sealing ring and the cathode bottom cover is internally provided with an auxiliary support piece; a bulged structure facing towards and pushing against the annular main body is arranged on the auxiliary support piece; an air outlet hole communicated with an air release cavity is formed in the auxiliary support piece positioned on the inner side of the bulged structure; and the air outlet hole is communicated with the air release holes. The current collector has the advantages that the bulged structure facing towards and pushing against the annular main body is arranged on the auxiliary support piece, the deformation freedom degree of the sealing ring can be reduced greatly when internal air pressure of the battery is increased, and the distortion of explosion-proof trench shape and explosion-proof pressure caused by excessive deformation of the sealing ring can be prevented.

Description

technical field [0001] The invention relates to a battery sealing and explosion-proof structure, in particular to a battery current collector. Background technique [0002] The current collector is an important structure in the battery, and its functions mainly include three aspects: one is to collect and transport the current generated by the negative part of the battery to the outside; the second is to seal, that is, to close the opening at the bottom of the battery case; the third is to be safe and explosion-proof , to prevent the battery from exploding due to excessive internal gas pressure. [0003] For example, the Chinese authorized invention patent with the announcement date of June 9, 2010 and the patent number of 200710166429.8 discloses a "battery collector". The battery collector includes a sealing ring, a negative bottom cover and a conductor nail. The sealing ring is a A rotating body, the rotating body includes a central cylinder in which the conductor nails...

AI Technical Summary

Problems solved by technology

The battery current collector with the above structure has the following disadvantages: 1. Although when the internal pressure of the battery is abnormal, the weak layer at the explosion-proof structure will break to achieve the purpose of explosion protection, but when the internal pressure of the battery is too high, the annular body on the sealing ring will also break. Excessive deformation occurs, which affects the shape of the explosion-proof structure, which in turn distorts the explosion-proof pressure of the explosion-proof structure

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