Simulation and parameter identification based on electrochemical-thermal coupling model of power lithium ion-battery

Based on the electrochemical-thermal coupling model of lithium-ion battery, the electrochemical behavior and parameter sensitivity identification of the numerical model are profoundly studied. Also, the internal physico-chimica evolution and design optimization under different working conditions are analyzed. On this basis, summarized is the sensitivity of 23 parameters such as electrode structure parameters, material property parameters and kinetics parameters of the power lithium-ion battery, and the battery design is therefore optimized. The research shows that if the battery voltage is used as the basis for measuring the degree of dispersion of the model output when the parameters are changed, the parameter identification work can be more accurate. The 23 parameters selected in this paper are identified, and the high, medium, low and non-sensitive parameters are respectively 7, 8, 4, 4; changes in design parameters will cause changes in the state of charge, which in turn affect the model output. (C) 2020 Elsevier B.V. All rights reserved.