Mobile QR Code QR CODE : The Korean Institute of Power Electronics
Title The Research on the Modeling and Parameter Optimization of the EV Battery
Authors Il-Song Kim
DOI 10.6113/TKPE.2020.25.3.227
Page pp.227-234
ISSN 1229-2214
Keywords Battery modeling; Parameter optimization; SIMULINK; State variable; Least square error
Abstract This paper presents the methods for the modeling and parameter optimization of the electric vehicle battery. The state variables of the battery are defined, and the test methods for battery parameters are presented. The state-space equation, which consists of four state variables, and the output equation, which is a combination of to-be-determined parameters, are shown. The parameter optimization method is the key point of this study. The least square of the modeling error can be used as an initial value of the multivariable function. It is equivalent to find the minimum value of the error function to obtain optimal parameters from multivariable function. The SIMULINK model is presented, and the 10-hour full operational range test results are shown to verify the performance of the model. The modeling error for 25 degrees is approximately 1% for full operational ranges. The comments to enhance modeling accuracy are shown in the conclusion.