Battery equalization circuit and method with cross-branch battery electric quantity equalization function

The invention relates to a battery equalization circuit with a cross-branch battery electric quantity equalization function, which comprises a controller, an energy storage element, a first bus, a second bus and a plurality of battery equalization modules, and is characterized in that the battery equalization modules which are longitudinally arranged are sequentially connected in series to form a battery equalization module group; the transversely arranged battery equalization module groups are respectively connected in parallel with two ends of the energy storage element; and the controller is connected with the control end of the battery equalization module. The battery equalization module comprises four switch tubes, a storage battery and a voltage sensor. The invention also discloses a same-branch battery equalization method and a cross-branch battery equalization method. Equalization of any two storage batteries in the battery array is realized, and positive and negative adjustability of output voltage o