锂离子电池卷绕机电芯收卷内应力动力学建模及控制研究OA

Winding process is the core step in the manufacturing of cylindrical lithium-ion battery cells.During high-speed winding,the internal stress generated in the positive/negative electrodes and the separator is a critical factor affecting winding quality.Taking the cylindrical lithium-ion battery as the research object,and targeting high-speed winding conditions,a dynamic analysis of the winding process is conducted based on elasticity mechanics,and a mathematical model for the tangential stress inside the cell during high-speed winding is established.On this basis,the influences of different tension control methods,such as constant-tension winding and tapered-tension winding,on the tangential stress are compared and analyzed.A constant-tension winding scheme for the positive/negative electrodes and the separator is proposed and verified through experiments.The results show that the tangential stress first increases and then decreases with the increase of winding radius.The tension fluctuation range in the experiments meets the±5%requirement for high-speed winding equipment.The cell winding is stable without defects such as bulging,breakage,or non-uniformity,and both the cell height and diameter meet the tolerance requirements,thereby verifying the proposed winding methodology.