Modeling of the lithium battery cell for plug-in hybrid electric vehicle using electrochemical impedance spectroscopy

Abstract

Online simulations are utilized to reduce time and cost in developing and optimizing the performance of plug-in hybrid electric vehicle (PHEV) and electric vehicles (EV) systems. One of the most important factors in an online simulation is the accuracy of the model. In particular, a model of a battery should accurately reflect the properties of the actual battery. However, precise dynamic modelling of a high-capacity battery system, which significantly affects the performance of a PHEV, is difficult because of its nonlinear electrochemical characteristics. In this study, a dynamic model of a high-capacity battery cell for a PHEV is developed by the extraction of the equivalent impedance parameters using electrochemical impedance spectroscopy (EIS). Based on the extracted parameters, a battery cell model is implemented using MATLAB/Simulink, and charging/discharging profiles are executed for comparative verification. © 2013 Springer-Verlag.