An Electro-thermal Model for the A123 26650 LiFePO4 Battery

Abstract

An electro-thermal model consisting of an equivalent-circuit electrical model and a two-state lumped thermal model is constructed for an A123 26650 LiFePO4 battery. The electrical and the thermal sub-models are coupled through heat generation and temperature dependency of the electrical parameters. The 5-state model captures the state of charge, voltage, surface temperature, and core temperature of a battery and is computationally efficient. The electrical and the thermal models are parameterized by pulse-relaxation and drive-cycle tests separately, where the electrical parameters are identified as dependent on temperature, SOC and current direction.