Laser welding process for welding nickel-plated copper with thickness of 200 microns by employing single-mode laser

Abstract

The invention relates to a laser welding process, and particularly relates to a laser welding process for welding nickel-plated copper with the thickness of 200 microns by employing a single-mode laser. The laser welding process is characterized in that a welding clamp is a copper cup pressing mechanism and presses the periphery of a welding part of a test piece, and shielding gas is blown out inthe welding process to protect the welding part; an experimental material is placed on a workbench, a copper cup is controlled to move to the welding part through a PLC program and is pressed, and anair blowing instruction is given through a PLC in the welding process; the laser is the single-mode laser, a galvanometer head is adopted for welding, the defocusing amount is +2mm, and the laser power, the welding speed and the welding path are adjusted through a laser control system; and employed process parameters of the laser welding are as follows: the laser power is 900w-1200w, the welding speed is 170mm / s-240mm / s, the welding path is a hyperbola, and the defocusing amount is + 2mm. In the welding process, various welding process parameters are adjusted, the process environment is improved, it is guaranteed that welds are well formed, macroscopic defects are avoided, all performances meet the production and application standards, the welding problem generated when the nickel-plated copper is applied to the production of the positive electrode of the battery tab is solved, and the quality of the welding joints is guaranteed.

Description

technical field [0001] The invention relates to a laser welding process, in particular to a laser welding process for welding 200 micron-thick nickel-plated copper with a single-mode laser. 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 is ultrasonic welding, but after ultrasonic welding, there will be virtual welding, Defects such as burrs, unstable pulling force, unstable discharge current, and excessive resistance. 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 weldi...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a laser welding process for welding 200 micron thick nickel-plated copper with a single-mode laser. The present invention adopts the laser welding process, adjusts various welding process parameters and improves the process environment in the welding process to ensure that the weld seam is formed Good, no macroscopic defects, all aspects of performance meet the production and application standards, solve the welding problem when this kind of nickel-plated copper is used in the production of positive electrodes of battery tabs, and ensure the quality of such welded joints

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