A circuit-based approach for electro-thermal modeling of lithium-ion batteries

Abstract

A two-dimensional electro-thermal model has been developed to provide a tool that can be used to gain a better understanding of dynamic behaviour of lithium-ion (Li-ion) batteries. The model incorporates an equivalent circuit model (ECM) and a coupled electro-thermal model to simulate the non-uniform heat generation rate, the temperature distribution, and the voltage response of the Li-ion cell across variety of operating conditions. The ECM is comprised of two resistance-capacitance (RC) networks, one sires resistor, and one voltage source that are all function of state-of-charge (SOC) and temperature (T). Hybrid pulse power characterization (HPPC) test is applied to extract the ECM parameters at different ambient temperature. The simulations results of the cell model under constant current discharge tests show a good agreement with the experimental data at different environmental temperature. The developed model can be employed for battery thermal management system (BTMS) and battery management system (BMS) design with a light computational demand.