Laser welding system and method for battery cover plate

Abstract

The embodiment of the invention belongs to the technical field of laser welding and relates to a laser welding system and method for a battery cover plate. The system comprises an optical fiber laserdevice, a galvanometer assembly, a battery clamp, an air supply device and an air exhaust device; the optical fiber laser device is connected to the galvanometer assembly through optical fibers, the galvanometer assembly is located just above the battery clamp, and the battery clamp is separately connected to the air supply device and the air exhaust device. The method includes the steps that thebattery clamp and a battery to be welded are located just below the galvanometer assembly; lasers are focused on the cover plate; the air supply device and the air exhaust device are started; the optical fiber laser device is started, and the battery is welded according to a preset laser welding trajectory. According to the technical scheme provided in the embodiment, through galvanometer welding,it can ensure that welding seam corners are not collapsed, and the welding speed can be higher; at the same time, through air supply and air exhaust at an unchanged speed, exhaust gas and waste residues generated during welding can be removed in time to ensure that the surfaces of welding seams are flat and bright.

Description

technical field [0001] The embodiments of the present invention belong to the technical field of laser welding, and in particular relate to a laser welding system and method for a battery cover plate. Background technique [0002] At present, most of the power battery cover plates adopt the laser welding method with a three-axis platform equipped with a fixed welding head. The welding speed is mostly low, generally controlled between 70-90mm / s. When the welding speed increases, the three-axis motion platform will have an obvious speed reduction phenomenon when welding corners, which will cause the corners of the weld to collapse. In addition, In the prior art, a large amount of air is easily involved in the shielding gas during welding, and the flow rate and pressure distribution of the shielding gas are uneven, resulting in low welding quality. Contents of the invention [0003] In view of this, an embodiment of the present invention provides a laser welding system and m...

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Problems solved by technology

[0003] In view of this, an embodiment of the present invention provides a laser welding system and method for a battery cover plate to solve the problem that in the existing technical solution, when the welding speed is increased to perform corner welding, there will be an obvious slowdown phenomenon, and the weld corners are prone to collapse. , and to solve the problem that a large amount of air is easily involved in the protective gas, and the flow rate and pressure distribution of the protective gas are not uniform

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