Research on the calculation method and dynamic modeling of traction-battery SOC for electric vehicle

In view of the fact at home or abroad that it is difficult to achieve the accurate quantitative measurement and the analysis of dynamic change of traction-battery SOC when the EV moving, the paper has build real-time calculation model of traction-battery SOC in EV based on temperature, voltage and electric current, had battery capacity on the different condition converted into one available battery capacity on a specific temperature condition, gotten the battery SOC more accurate compared to the traditional methods, and avoided battery capacity estimate error and calculated amount that result from the battery SOC nonlinear change in the real situation. Besides, it has provided the theory basis and the testing method for the drive-battery´s management and the observation system.