The imbalance of cell will reduce the performance and even damage the series lithium-ion battery pack. This paper proposes a new equalization based on switched equalization structure. The switch array of the equalization is constructed from multiple MOSFETs. The excess energy transfer in cells is achieved through full-bridge circuit control. Using theoretical derivation, the paper shows the working principles of the new equalization, including soft start mode, boost mode and buck mode. Then the equalization strategy is designed which based on modes switch, and the ON-time of each MOSFET is given. Finally, a simulation model including 6 series batteries is built on the SIMULINK, the feasibility of proposed equalization is verified by the equalization experiments of the battery pack in charging, discharging and static state. This equalization approach has the advantages of low implementation cost and strong scalability.