Laser welding process for dissimilar metal connecting material at tab part of lithium battery

Abstract

The invention relates to a laser welding process, and particular relates to a laser welding process for a dissimilar metal connecting material at a tab part of a lithium battery. The laser welding process comprises the following steps: adopted dissimilar metals are aluminum alloy and nickel-plated copper, the aluminum alloy is 6061 aluminum alloy, the mark of the nickel-plated copper is Ni6T2, a stitch welding mode is adopted for welding, and the welding process is carried out in a dust-free working chamber; before welding, the surface of an experimental material is cleaned firstly, and it isguaranteed that the surface of a plate is clean and free of pollution; then the plate is stacked on a workbench and fixed through a clamp, and the laser position is adjusted to be located at the center of a to-be-welded part; and laser welding parameters and the welding process are adjusted through a laser control system. According to the process, the welding problem of the series-parallel connection end of the tab in the production process of the 6061 aluminum alloy and the Ni6T2 is solved, stable laser power can be output by adopting the single-mode laser welding process, various welding process parameters are adjusted in the welding process, the process environment is improved, it is guaranteed that welding spots are well formed, macroscopic defects are avoided, and all performances meet the production and application standards.

Description

technical field [0001] The invention relates to a laser welding process, in particular to a laser welding process for connecting materials of dissimilar metals at tabs of lithium batteries. Background technique [0002] In the tab welding of new energy lithium batteries, nickel-plated copper, copper, and aluminum are commonly used. These three materials are used as battery tabs for welding. The traditional welding method uses ultrasonic welding, but after ultrasonic welding, there will be false welds and burrs. , Unstable pulling force, unstable discharge current, excessive resistance and other defects. Ultrasonic welding adopts material contact processing, which puts forward high requirements on the parallelism and flatness of the material surface, which makes it impossible to process stably. Therefore, in recent years, many manufacturers use laser welding technology instead of ultrasonic welding. [0003] Laser welding has the advantages of high energy density, fast weld...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a laser welding process of dissimilar metal connecting materials at the tabs of lithium batteries. The present invention solves the problem of 6061 aluminum alloy and Ni 6 T 2 Applied to the welding problem of the series and parallel terminals of the tabs in the production process

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