The Research On Laser Welding Process Of Battery Busbar For New Energy Vehicle

1060 aluminum alloy is widely used in the manufacture of automotive power battery case and battery busbar.The connection between the battery case and the battery busbars requires protection of the internal electrode material and leakage of the electrolyte solution and ensures good electrical conduction between the individual battery packs.The structural characteristics and the manufacturing of the Battery shell and busbar's process constraints the traditional welding method in the battery shell and busbar welding applications.Therefore,there is an urgent need to study non-contact flexible laser welding process to meet the automotive power battery shell and busbar manufacturing requirements of welding.In this paper,using the 1.5mm thick of 1060 aluminum alloy as the research object and Using laser welding method,The effects of laser power,welding speed,defocusing,laser beam inclination and pulse laser energy on the morphology,penetration depth,fusion width,mechanical properties and microstructure of aluminum alloy welded joints were studied.Experimental design and analysis were carried out by considering the interaction between multiple factors in the actual production process,making the welding depth is 2.5 mm and the fusion width is more than 1.1 mm as the target value And obtained the best technology of the Non-penetration lap welding of the aluminum alloy busbar of power battery,the laser power is 3.75 kW,the welding speed is 0.04 m/s,the laser beam inclination angle is 0°,and the defocusing amount is 1.5 mm.By the results of tensile strength and microstructure analysis of welded aluminum alloy welded joints,we can find that the microstructure of the welded joint is composed of columnar crystals,dendrites and equiaxed grains.The tensile strength of the welded joint reaches 93% of the base metal.