The present invention relates to the battery field, and specifically, to an energy balancing apparatus and method, and a terminal. The apparatus includes a controlled alternating current energy supply, an alternating current energy distribution unit, filter units, rectifier units, and a balance control unit. The controlled alternating current energy supply and an input port of the alternating current energy distribution unit are connected in parallel, each output port of the alternating current energy distribution unit and an input side of a corresponding filter unit are connected in parallel, frequency intervals corresponding to any two filter units do not overlap, an output side of each filter unit and an alternating current side of a corresponding rectifier unit are connected in parallel, a direct current side of each rectifier unit and a corresponding battery cell are connected in parallel, each battery cell is connected to the balance control unit, and the balance control unit is connected to the controlled alternating current energy supply.