Li-Ion Battery Model Performance for Automotive Drive Cycles with Current Pulse and EIS Parameterization

To examine different battery modeling approaches, three equivalent circuit battery model types and two battery model parametrization methods are investigated in this paper. A simple model, consisting an open circuit voltage and a series resistance, is compared with two enhanced approaches. The first enhanced approach includes a Warburg Impedance to capture diffusion and the second adds two parallel RC circuit pairs to capture double layer capacitance and charge transfer resistance effects. The model parameters are determined with either time or frequency domain test data and performance for both parameterization methods are compared. Finally, model accuracy is experimentally evaluated for a matrix of drive cycles and temperature values.