Laser Welding Process of Lithium Battery Lugs Based on Finite Element Simulation

To investigate the application of laser welding in the production of lithium battery modules for electric vehicles, this study employs the finite element method to simulate the welding process of lugs and busbars in lithium batteries under different parameters. The objective is to analyze the temperature change in the lugs, and its influence on the depth and width of the welds. The temperature field is simulated with varying welding heat inputs to examine the distribution of stress during welding and residual stress patterns in the weldments, as well as the deflection of the weldments under different welding parameters. The analysis of stress field simulations allows for the assessment of residual stress distribution and weldment deflection. The findings indicate that the width of the molten pool is significantly affected by the laser power and welding speed. Moreover, the laser power has a greater influence on the residual stress of the weldment compared to the welding speed.