Simulation and verification of lithium-ion battery temperature changing process

To investigate the temperature-variation of the soft package lithium-ion battery during discharge, based on the basic heat generation model, through internal resistance test and temperature rise experiment under 0.5 C discharge, the transient heat rate curve is calculated and entropy coefficient is obtained. A transient thermal model can be established and the heating rate varies with the depth of discharge changing. The temperature variation was simulated by using this model and compared with the experiment. It shows that the simulation results are consistent with the experiment. This model can simulate the battery temperature change process under different discharge ratio very well, which has guiding mean for the battery temperature variation analysis and the thermal management.