In order to solve the problem of imprecise SOC estimation of Li-ion battery,a new SOC estimation method based on the second-order RC equivalent circuit model,RLS(recursive least square)and UKF is proposed.Firstly,the discrete state space equation and observation equation of the second-order RC are derived.Secondly,the SOC-OCV fitting curve of the battery is obtained through experiments and the RLS method is used to identify the parameters of the model.Finally,the adaptability of the adaptive extended Kalman filtering algorithm(AEKF)and UKF algorithm to the model is compared through simulation,...
