Seongyong Park

Modeling the Dependence of the Discharge Behavior of a Lithium-Ion Battery on the Environmental Temperature

This paper reports a method of modeling the dependence of the discharge behavior of a lithium-ion battery (LIB) on the environmental temperature. A comparison of the experimental discharge curves for discharge rates ranging from 0.5 to 5 C and environmental temperatures of 15, 25, 35, and 45°C with the modeling results validates the two-dimensional modeling of the potential and current density distributions on the electrodes of an LIB as a function of the discharge time during galvanostatic discharge based on the finite element method. The heat generation rates as a function of the discharge time and the position on the electrodes are calculated to predict the temperature distributions of the LIB based on the modeling results of the potential and current density distributions. The temperature distributions obtained from the modeling are in good agreement with the experimental measurements.

Modeling the effect of aging on the electrical and thermal behaviors of a lithium-ion battery during constant current charge and discharge cycling

Abstract This paper reports a two-dimensional modeling to predict the aging effect on the variation of the electrical and thermal behaviors of a lithium-ion battery (LIB) cell under the constant current (CC) charge and discharge cycling over a long time. To account for the aging effects of the LIB cell due to cycling, the key modeling parameters are expressed as a function of cycling number. In order to validate the modeling methodology introduced in this paper, the modeling results towards the changes of the discharge curves and two-dimensional temperature distributions of the aged LIB cell during CC discharge at different C rates are compared with the experimental measurements after every thousand cycles. The electrical and thermal behaviors predicted by the modeling for the aged LIB cell show good agreement with the experimental data.