Thermal Model and Experimental Verification of Lithium-Ion Battery Based on Heat Generation Rate

Abstract

In order to study the temperature distribution in a lithium-ion battery (LIB), a series of experiments including open-circuit voltage (OCV) test, discharge rate test, hybrid pulse power characteristic (HPPC) test, and discharge temperature rise test based on the Bernardi heat generation model were conducted. The thermal model (TM) of the LIB under different discharge rates was established. The temperatures of the cell at different discharge rates calculated by the TM, which leverages the user-defined function (UDF) to import a variable heat generation rate, were compared with the experimental data. Moreover, this TM was used to simulate the LIB temperature at different ambient temperatures and different heat-transfer coefficients and analyze the temperature distribution of cell. The results showed that the TM can accurately simulate the temperature rise of the LIB at different discharge rates, which provides a reference value for LIB thermal management.