Modeling the Thermal Behaviors of a Lithium-Ion Battery during Constant-Power Discharge and Charge Operations

This paper reports a modeling methodology to predict the thermal behaviors of a lithium-ion battery (LIB) during constant-power discharge and charge operations. An efficient algorithm is presented to estimate the voltage and current of an LIB as a function of time in the mode of constant-power discharge and charge. The experimental discharge and charge curves at various power levels of 25, 50, 100, 150, and 250 W are compared with the modeling results to validate the two-dimensional modeling of the potential and current density distribution on the electrodes of an LIB cell during constant-power operations. The two-dimensional temperature distributions of the LIB cell as a function of time are calculated based on the modeling results of the two-dimensional potential and current density distributions. The temperature distributions obtained from the modeling agree well with the experimental measurements based on infrared imaging.