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Introduction of Laser Welding Process for Lithium Ion Battery

2021-08-20

From the manufacture of Lithium Ion Battery cells to battery pack assembly, welding is a very important manufacturing process. The conductivity, strength, air tightness, metal fatigue and corrosion resistance of Lithium Ion Batteries are typical battery welding quality. Evaluation criteria. The selection of welding methods and welding processes will directly affect the cost, quality, safety and consistency of lithium-ion batteries.

Among the many welding methods, laser welding produced by lithium-ion batteries stands out with the following advantages: First, 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, free of impurities, and evenly dense. No additional polishing work is required; secondly, laser welding can be precisely controlled, with a small focus spot, high-precision positioning, and easy automation with mechanical arms, improving welding efficiency, reducing man-hours, and reducing costs; in addition, laser welding thin plates or thin diameters When using wire, it will not be troubled by remelting as easily as arc welding.

The technological advantage of laser welding lies in the wide range of materials that can be welded, and the welding between different materials can be realized. In the power lithium ion battery welding process, the welding process technicians will select the appropriate laser and welding process parameters according to the battery material, shape, thickness, and tensile requirements, including welding speed, waveform, peak value, and welding head inclination angle to set reasonable settings Welding process parameters to ensure that the final welding effect meets the requirements of power lithium-ion battery manufacturers.

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