The series and parallel connections between power batteries are generally completed by welding the connecting piece and the single battery. The materials of the positive and negative electrodes are different. Generally, there are two kinds of materials: copper and aluminum. Because copper and aluminum are welded by laser, they can form brittle compounds. To meet the application requirements, ultrasonic welding is usually used, and laser welding is generally used for copper and copper, aluminum and aluminum. At the same time, since copper and aluminum conduct heat very quickly, have a very high reflectivity to the laser, and the thickness of the connecting piece is relatively large, it is necessary to use a higher-power laser to achieve welding. This shows that laser welding has come to the fore among many welding methods. First of all, laser welding has high energy density, small welding deformation, and small heat-affected zone, which can effectively improve the accuracy of parts. The welding seam is smooth and free of impurities, uniform and dense, without additional grinding work; secondly, laser welding can be precisely controlled and focused on light. Small dots, high-precision positioning, easy to achieve automation with mechanical arms, improve welding efficiency, reduce man-hours, and reduce costs; in addition, laser welding of thin plates or thin-diameter wires will not be as susceptible to reflow as arc welding. And it can be welded with a wide range of materials, which can realize welding between different materials.
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