Abstract: The inconsistency of the single unit of the series battery pack will increase the risk of battery operation and likewise reduce the available capacity and service life of the battery pack, while the single structure of the battery pack also limits the safe, reliable and efficient operation of the battery pack. A dynamic reconfigurable equalizer with its control method is proposed for the series lithium battery pack, the safety and reliability of the series battery pack are improved at the same time as the balancing speed is improved. Every LC resonant unit is composed of a capacitor in series with an inductor, all the switches work in zero-current switching, which effectively reduces the switching loss. Every battery is connected in parallel to a bypass switch and connected in series to a cut-out switch, when the battery does not need to be charged or discharged or does not need to be equalized, the two sets of switches can be used to realize the reconfiguration of the series battery pack as well as ensure the safe and reliable operation of the battery pack. The bypass switches and cut-out switches can effectively improve the structural flexibility, safety and balance path accuracy of the series battery pack. By reconfiguring the structure of the battery pack, equalization between any non-adjacent multiple cells and any non-adjacent multiple cells can be realized, and while ensuring equalization accuracy, the equalization speed and efficiency are improved. Two operating modes of the circuit are described in detail, the equalization principle, power and efficiency of each operation mode are analyzed as well, and finally the correctness of the theoretical analysis is verified by the simulation circuit.