An energy balancing apparatus, wherein the energy balancing apparatus comprises a controlled alternating current energy supply, an alternating current energy distribution unit, filter units (filter1, 2, 3..., N), rectifier units (Reel, 2, 3..., N), and a balance control unit, wherein the alternating current energy distribution unit comprises N output ports and at least one input port, N is an integer not less than 2, a quantity of the filter units (filter1, 2, 3..., N) is N, frequency intervals corresponding to any two filter units (filter1, 2, 3..., N) do not overlap, a quantity of the rectifier units (Rec1, 2, 3..., N) is N, the output ports of the alternating current energy distribution unit correspond one-to-one to the filter units (filter1, 2, 3..., N), the filter units (filter1, 2, 3..., N) correspond one-to-one to the rectifier units (Rec1, 2, 3..., N), each of the filter units is connected to a corresponding one of the rectifier units, and the rectifier units (Rec1, 2, 3..., N) correspond one-to-one to battery cells (B1, 2, 3..., N); and the controlled alternating current energy supply, and the input port of the alternating current energy distribution unit are connected in parallel, the controlled alternating current energy supply is connected to the balance control unit, and the controlled alternating current energy supply is configured to output, according to a frequency instruction signal sent by the balance control unit, an alternating current voltage corresponding to the frequency instruction signal; each output port of the alternating current energy distribution unit and an input side of a corresponding filter unit (filter1, 2, 3..., N) are connected in parallel, and the alternating current energy distribution unit is configured to distribute, to each output port, alternating current energy transferred from the controlled alternating current energy supply; an output side of each filter unit of the N filter units (filter1, 2, 3..., N) and an alternating current side of a corresponding rectifier unit (Rec1, 2, 3..., N) are connected in parallel, and each filter unit (filter1, 2, 3..., N) is configured to allow alternating current energy whose frequency is in a preset frequency interval to pass; two ends of a direct current side of each rectifier unit of the N rectifier units (Rec1, 2, 3..., N), and two ends of a corresponding battery cell (B1, 2, 3..., N) are configured to be connected in parallel, and the rectifier unit (Rec1, 2, 3..., N) is configured to convert, into direct current energy, the alternating current energy transferred from the filter unit (filter1, 2, 3..., N), and transfer the direct current energy to the battery cell (B1, 2, 3..., N); and each battery cell (B1, 2, 3..., N) is connected to the balance control unit, the balance control unit is configured to acquire a status parameter of each battery cell (B1, 2, 3..., N), determine, according to a status parameter of each battery cell (B1, 2, 3..., N), a battery cell (B1, 2, 3..., N) that requires an energy supplement, determine a frequency interval of a filter unit (filter 1, 2, 3..., N) corresponding to the battery cell (B1, 2, 3..., N) that requires an energy supplement, and send a frequency instruction signal to the controlled alternating current energy supply, so that the controlled alternating current energy supply outputs an alternating current voltage whose frequency is in the frequency interval; wherein the controlled alternating current energy supply comprises an inverter structure and an inverter control structure, and the inverter control structure is configured to receive the frequency instruction signal sent by the balance control unit, and instruct the inverter structure to output an alternating current voltage whose frequency is corresponding to the frequency instruction signal; the inverter control structure is configured to receive M frequency instruction signals, and to generate corresponding drive signals according to the M frequency instruction signals; characterized in that, when M>1, the inverter structure is configured to output the alternating current voltage which is obtained after multiple frequencies are modulated.