The invention provides an active
equalization charging device and method for a
power battery, and aims to solve the problems that an active
equalization device cannot perform bidirectional
equalization charging, grouping equalization charging and battery adjacent and non-adjacent equalization charging at the same time. The
system comprises a main controller, a battery
management system (BMS), n equalization charging modules, n battery cells, n transmission
bus isolation switches, and two charge transmission buses B+ and B-. According to the device,
battery cell grouping parallel equalization, charge bidirectional, adjacent and non-adjacent transmission, energy leap type transmission and no equalization overlapping problem can be realized, the equalization effect is good, the expansion is easy, and the circuit is easy to realize. In addition, the direct non-adjacent charge transfer maintains the service life of the intermediate battery by reducing the charge-
discharge period of the intermediate battery and minimizing the loss caused by the number of charge transfer steps, and the
energy transfer efficiency of the equalization process is also improved.