Multi-method integrated on SOC estimation of Li-ion battery

The Li-ion battery is studied base on its equivalent circuit model. The discrete state space equation is established using Ah counting method and OCV method. The filtering algorithm is set up under the noisy environments according to the principle of extended Kalman filter and simulated. The simulation results showed that the integrated of three algorithms could very well remove the environments noise, so the accurate estimate of Li-ion battery SOC value can be gained.