Performance Evaluation of Lithium-ion Battery Second Order Thevenin Equivalent Circuit Model under Various Temperature Levels

This paper selected the second order Thevenin equivalent circuit model to simulate the dynamic behavior of lithium-ion battery. The relationship between the state of charge and the open circuit voltage of the battery was obtained via the incremental current open circuit voltage test. Then, the equivalent circuit model parameters were extracted appropriately. The model was established in MATLAB Simulink and was validated using constant current pulsed discharge and pulsed charged conditions. The performance of proposed model was later on tested under varying temperatures for different dynamic profiles. The simulation results showed that the model can precisely represent the static and dynamic behaviors of the battery and the parameters identified have high accuracy where it gives increased precision at higher temperatures.