Simulation and Validation of a Precise 2RC Model of Lithium-Ion cell Incorporating Wire-bond Losses

Li-ion cell is a popular electrochemistry for energy storage devices in electric vehicles and portable electronics. This is mainly due to their relatively high energy-density and power-density compared to other types of battery chemistry. In a battery pack, several li-ion cells are interconnected in a series-parallel fashion to meet the current and voltage demands of the load. Interconnecting wires or wire-bonds add parasitic resistance to the current path, contributing to power loss. Therefore, it is essential to include wire-bond losses in the battery model to get an accurate prediction of battery performance. In this paper, the authors have developed a 2RC model of li-ion cells, taking into account the wire-bond losses. Simulation was performed in MATLAB Simulink and the simulated results were verified with hardware results obtained using a li-ion battery cycler.