Battery Pack Thermal Modeling, Simulation and Electric Model Identification

Abstract

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.

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“…This distribution significantly affects the performance, efficiency, safety, and lifespan of the battery pack, as excessive or uneven temperature can cause degradation, capacity fade, or thermal runaway. [ 48 ] To analyze the thermal distribution inside the battery pack, different modelling approaches can be used, such as high‐fidelity modeling and lumped modeling. High‐fidelity modeling provides detailed information about the electrochemical and thermal behavior of individual battery cells, but it is computationally expensive and requires many input parameters.…”

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“…Because thermal stability having the largest effect on reliability on operational condition of battery pack. K Saqli et al [18]. The battery pack is cooled using air cooling approach with different inlet velocity to investigate its impact on the model temperature evolution, and the developed thermal model was then, charged/discharge at different temperatures to generate the essential data needed to model an electric-thermal model and identify its parameters in Matlab/Simulink soft ware.…”