To reduce the inconsistency of battery packs, to enhance the overall performance of battery packs, and to prolong electric vehicle mileage, an innovative balancing converter for the lithium battery pack is proposed in this paper. During the battery pack working process, this topology makes it convenient to transfer extra energy from one cell to any other cells, namely, active pack management composed of improved bidirectional DC-DC converters which are presented with the Hybrid Natural and Forced Active Balancing Control (HNFABC). Adopted strategy of HNFABC, the simulation model based on Partnership for a new generation of vehicles of the balancing circuit is set up with four batteries in PSIM. The simulation results display that HNFABC makes balance circuit possible to achieve equilibrium quickly.