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The equalization strategy simply based on cell voltage or state of charge is used in pure electric racing car. However, there is deviation in estimating state of charge or detecting cell voltage, which causes switches to open and close frequently or improperly, lowing equalization efficiency. Taking energy utilization and equalization efficiency into account, according to the actual operating characteristics of lithium batteries, we studied one new equalization strategy combined cell voltage and state of charge. First of all, one kind of lithium battery model was built and then the active equalization circuit based on the battery model was also built. Secondly, the equalization strategy was simulated. At last, one discharge experiment on the equalization module was conducted. The simulation and experiment results show that our strategy can improve energy utilization, reduce opening and closing times of switches and obtain better equalization effects. Keywords-pure electric racing car; battery consistency; battery model; equalization strategy

Active Equalization for Lithium Batteries Combined Cell Voltage with State of Charge