A Dynamic Coupled Electro-Thermal Equivalent Circuit Model with Reversible Entropy Heat for Lithium-Ion Batteries

Electrical, thermal, and chemical effects of batteries must be considered together for accurate modeling of the battery characteristics. Chemical effects of Lithium-ion batteries involve battery relaxation, recovery effect and reversible entropy heat. Previous hybrid kinetic circuit model can handle the first two chemical effects. This study incorporates the reversible entropy heat in a coupled electro-thermal equivalent circuit to form a dynamic electro-thermal battery model. The new battery model offers accurate dynamic performance as evidenced by good agreements between model predictions and practical measurements in terms of battery voltage, current, temperature and state-of-charge. The error in battery surface temperature prediction is kept within 0.5%. It is suitable for both circuit simulation and practical real-time control.