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A nonlinear equivalent circuit model for battery of electric vehicle is presented,taking into account the nonlinear effects of State of Charge,Capacity and other battery internal parameters.The emphasis of this paper is to calculate the battery capacity using two different methods.Battery test and data processing for model parameter identification uses EKF(Extended Kalman Filter)technolo-gy are discussed.Compared with the capacity calculated using a single method alone,convergence speed and accuracy are improved.The method mentioned in this paper has been used to estimate the accuracy of the SOH within 5%by the vehicle reliability test.