In order to solve the inconsistency between the single cells of lithium batteries, the battery charge characteristics, battery discharge characteristics and the inconsistencies characteristics of the battery string were analyzed. A hybrid active balance control method combined with a balancing transformer and a balancing inductance using BQ78PL116 controllers was proposed on the basis of existing balance topologies. The hardware and software of the system were designed including a circuit for the battery equalization based on the balancing transformer, a master control system and the corresponding software and communication programs to build a battery management system. The experiment results certificate that the mixed active balance has faster balance speed and higher efficiency.