An investigation on deformation behavior of Lithium-ion battery based on the electrochemical-thermal-mechanical coupling model

Abstract

To find out a more effective way to detect the overcharge of Lithium-ion battery (LIB), using the LIB module, heat transfer module and mechanics module, the electrochemical-thermal-mechanical coupling model of LIB is constructed in the COMSOL Multiphysics. The temperature and deformation of LIB under different state of charge (SOC) including overcharge are studied using the coupling model. The simulation results show that when the LIB is overcharged, the deformation of the battery shell will increase accompanied with a large temperature increase. In addition, the temperature and deformation of the overcharged LIB under different charge currents and ambient temperature are studied using the coupling model, and the results show that both the charge current and the ambient temperature have some effect on the overcharged battery. With the increase of the charge current and ambient temperature, the deformation of the battery shell will increase and the rate of battery temperature rise will be larger.