Evaluating the Impact of Current-based Cycling Profiles on a Lithium-ion Battery Model

This paper models the operation of a Lithium-ion battery pack when undergoing three current cycling profiles. In these scenarios, the battery model is undergoing charge and discharge regimes within applications such as a constant current and constant voltage process, a simulated frequency regulation current profile, and an electric vehicle current profile. The temperature conditions were kept constant. The battery model was developed using an open-source Python package, used default settings for internal resistances and the nominal terminal voltage and capacity of a commercial Li-ion battery pack. The simulation results show the impact of the battery cycling including selected degradation metrics and capacity loss. The battery degradation as a function of cycle number is represented in terms of the change in solid electrolyte interface (SEI) thickness, loss of capacity to SEI, and internal cell resistance. The battery model exercised under the electric vehicle current profile showed a considerable degradation and capacity loss when compared to the other current cycling profiles. In addition, the model undergoing the constant current and constant voltage profile presented the lowest degradation based on the analyzed metrics.