Modeling the dynamic behavior of a lithium-ion battery for electric vehicles using numerical optimization

In order to simulate the dynamical behavior of a lithium-ion traction battery used in electric vehicles, an equivalent circuit-based battery model was established. The methodology in the guide document of the ADVISOR software was used to determine the initial parameters of the model as a function of state of charge (SoC) over an experimental data set of the battery. A numerically nonlinear least squares algorithm in SIMULINK design optimization toolbox was applied to further optimize the model parameters. Validation results showed that the battery model could well describe the dynamic behavior of the lithium-ion battery in two different battery loading situations.