Battery model for Hybrid Electric Vehicle corrected for self-discharge and internal resistance

Accurate battery models are vital part of Electric Vehicle (EV) and Hybrid Electric Vehicle (HEV) simulation. An efficient battery model in hand enhances the ability to predict of the performance of EVs and HEVs. An improved battery model which can apply in HEV design and analysis is proposed in this paper. Integration of electrical and thermal characteristics of the battery provides accurate results from the model. This model also considers the effect of self-discharge on State of Charge (SOC) and terminal voltage of the battery. Effect of SOC on internal resistance is another critical factor which decides the performance of the battery. Addition of the effect of the factors affecting the battery parameters improves the accuracy of the model. Simulation study of Li-ion battery in MATLAB Simulink validates the reliability of the proposed model in various operating conditions. With slight modifications, the proposed model can also be extend to other battery technologies.