A method of laser welding explosion-proof sheet for aluminum shell battery cover plate

Abstract

The invention discloses an anti-explosion piece laser welding method of an aluminum shell battery cover plate, and relates to the technical field of aluminum shell battery making. The anti-explosion piece laser welding method comprises following steps that S1, an anti-explosion piece is placed on a pressure relief hole in the aluminum shell battery cover plate, a vacuum absorbing device is adoptedto generate negative pressure, and the anti-explosion piece and the edge of the pressure relief hole of the aluminum shell battery cover plate are subject to vacuum absorbing and tight attaching; S2,multiple welding points are selected around the welding path of the anti-explosion piece, and a laser welding head is adopted to carry out laser dotting pre-welding; S3, vacuum negative pressure is broken, and a vacuum absorbing device is moved away; S4, a laser welding head is adopted for carrying out laser full welding in a manner of surrounding the welding path of the anti-explosion piece, andthe anti-explosion piece and the aluminum shell battery cover plate are welded together. The warping deforming in the full welding process of the anti-explosion piece can be obviously reduced, the problem of gas leakage caused by burst point welding can be solved, and the welding yield can be obviously improved.

Description

technical field [0001] The invention relates to the technical field of manufacturing aluminum-case batteries, in particular to a method for laser welding explosion-proof discs of aluminum-case battery cover plates. Background technique [0002] In the power battery industry, in order to prevent the explosion problem caused by the high pressure inside the aluminum case battery, it is necessary to weld the explosion-proof plate on the cover plate of the aluminum case battery. When it is large, the explosion-proof disc will break to release the battery pressure and prevent the battery from exploding. The explosion-proof plate structure of the aluminum shell battery cover is as follows: figure 1 As shown, a pressure relief hole 11 is set on the aluminum case battery cover plate 1, and a piece of explosion-proof plate 2 that can withstand a certain pressure is welded on the pressure relief hole 11, and the welding must be sealed to prevent air leakage. [0003] At present, the ...

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Problems solved by technology

[0006] The technical problem to be solved by the present invention is to provide a laser welding method for the explosion-proof sheet of the aluminum shell battery cover plate according to the above-mentioned deficiencies in the prior art. , can avoid the problem of air leakage caused by welding explosion, and can significantly improve the welding yield

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