Energy balancing method and apparatus

An energy balancing apparatus, comprising:

• a controlled alternating current energy supply, an alternating current energy distribution circuit, filter circuits, rectifier circuits, and a balance control circuit,
• wherein the alternating current energy distribution circuit comprises N output ports and at least one input port, N is an integer not less than 2, a quantity of the filter circuits is N, frequency intervals corresponding to any two filter circuits do not overlap, a quantity of the rectifier circuits is N, the output ports correspond one-to-one to the filter circuits, the filter circuits correspond one-to-one to the rectifier circuits, and the rectifier circuits correspond one-to-one to battery cells;
• and
• the controlled alternating current energy supply and the input port of the alternating current energy distribution circuit are connected in parallel, the controlled alternating current energy supply is connected to the balance control circuit, and the controlled alternating current energy supply is configured to output, according to a frequency instruction signal sent by the balance control circuit, an alternating current voltage corresponding to the frequency instruction signal;
• each output port of the alternating current energy distribution circuit and an input side of a corresponding filter circuit are connected in parallel, and the alternating current energy distribution circuit is configured to distribute, to each output port, alternating current energy transferred from the controlled alternating current energy supply;
• an output side of at least one filter circuit of the N filter circuits and an alternating current side of a corresponding rectifier circuit are connected in parallel, and at least one filter circuit is configured to allow alternating current energy whose frequency is in a preset frequency interval to pass;
• and
• two ends of a direct current side of each rectifier circuit of the N rectifier circuits and two ends of a corresponding battery cell are connected in parallel, and the rectifier circuit is configured to convert, into direct current energy, the alternating current energy transferred from the filter circuit, and transfer the direct current energy to the battery cell.