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Application of Laser welding

A recognized and frequently used laser welding solution is based on galvanometer scanning laser welding machine. This "remote welding" technology is not particularly new in the vast world of laser welding, but it is getting more and more attention due to improvements in scanning heads and laser performance. Increasingly powerful high-power fiber lasers emit almost perfect beams, which can now be fully utilized within the ultimate speed of welding, and are not affected by the acceleration problems that limit other welding motion systems. The beam quality also ensures greater visual range, longer running time, and more incident angles, and can be used to weld multiple solder joints simultaneously in many battery welding configurations.

Other advances in laser welding related to high-speed galvanometer scanning include the emerging "flight path" welding technology. In this case, the wide coverage area, high welding speed and very high acceleration needed to be achieved can be achieved by precise synchronous scanning axes (A,B) and mutually perpendicular mechanical directions (X,Y). This high performance laser welding technology is currently being used in battery welding and fuel cell welding technology development challenges.

The final problem of laser welding for batteries is the stability and quality assurance aspects of machining. Based on the high speed and flexibility of laser welding, the success of the manufacturing process also depends on the performance of other mechanical parts in the whole system to achieve a good weld quickly. This is a very difficult task, especially considering the small size and high speed of the welding, as well as the large number of welds needed to be completed in battery production. At the same time, considering the required number of welding in the final battery package, the welding quality of the 6∑ grade is not enough and needs to reach a higher quality level. Most of the solutions to these major challenges (process routing and welding quality assurance) are achieved through high-speed image acquisition and analysis. Some of these methods have been tried in lower-speed laser welding applications, but further improvements in speed and accuracy are needed to ensure the full potential of laser welding in the battery manufacturing industry.

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