Balancing control device, balancing control method and related system

The invention discloses an equalization control device, an equalization control method and a related system.The equalization control device comprises a power interface, a first series interface, a first equalization interface and a control module; the control module obtains state parameters of the plurality of series battery packs, determines whether the plurality of series battery packs need to be equalized according to the state parameters of the plurality of series battery packs, and controls the first series interface to be connected with the power interface when the plurality of series battery packs do not need to be equalized, so that the energy storage converter (PCS) is connected with the plurality of series battery packs which are connected in series. When at least one battery pack needs to be equalized, the corresponding first equalization interface is controlled to be connected with the power interface, so that the energy storage converter is only connected with the battery pack needing to be equal