Battery Pack Thermal Modeling, Simulation and Electric Model Identification

Li-ion batteries are susceptible to high and low temperatures. Therefore, thermal management and heat prediction are essential to keep the temperatures of the energy storage system cells inside the optimal range of operation and assure safe and effective usage.In this paper, an electrochemical-thermal battery pack of three parallel-connected cylindrical Li-ion cells is modelled using COMSOL Multiphysics software. To investigate the impact of the inlet velocity on the evolution of the pack temperature and identify the ideal value capable of maintaining the overall temperature of the battery pack within limits, we placed our cells in a compartment where air flows at different values fixed at the beginning of each simulation.The developed thermal model was discharged using pulse data current at different temperatures to generate the essential data needed to model an electric-thermal model and identify its parameters in Matlab/Simulink software.