A Novel Current Disturbance Estimation Method for Battery Management Systems in Electric Vehicle

Current information is of great importance for battery management systems (BMSs), especially for the estimation of state of charge (SOC), state of health (SOH), etc. However, current information may have large disturbance caused by the current sensor. As a result, the estimated states will suffer large estimation error. This paper tries to estimate the current disturbance, and with the estimated disturbance, the obtained SOC could be accurate. The simplified battery model is utilized to the current disturbance estimation method and the accurate current disturbance could be obtained. The simulation work bench is established to verify the proposed method. The simulation results indicate that the proposed method can accurately estimate the current disturbance. Accordingly, with the accurate estimated current disturbance, the estimated SOC is very accurate too.