Establishment and validation of battery equivalent circuit model based on multivariate experimental data

The factors affecting the battery performance are taken into account, and an accurate equivalent circuit model of the battery model is developed for calculating the parameters of SOC, SOH, etc., in the simulation of the energy storage system along with battery management system. The experimental data were obtained by setting up experiments under different operating conditions, and the data were processed using multiple linear regression methods. Then, the model were determined by an offline identification method, and a battery model based on the multidimensional look-up table method was established. This model can be interpolated according to different operating condition data to adapt to changes in battery performance. Finally, the accuracy of the model and its SOC and SOH calculation strategies are verified by designing simulations and experimental cases.