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

- Aging effects on the performance of a lithium-ion battery are modeled during cycling.
- Key modeling parameters are expressed as a function of cycle number for aging effects.
- Cycling tests are performed under the constant current charge and discharge cycles.
- Modeling approach is validated by comparing modeling results with experimental data.
- Modeling results for aging effects agree well with cycling test data.

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.