Battery equalization circuit and control system

The invention discloses a battery equalization circuit and a battery equalization control system. The equalization circuit consists of a battery, an external direct current power supply, a DC-DC converter, a first switch, a second switch and multiple branch switches, wherein the first switch and the multiple branch switches are used for controlling equalization of battery cells; the second switch is used for controlling equalization of a battery pack consisting of multiple battery cells; the control system comprises a signal acquisition module, a processor CPU, an isolating circuit and a switching control module. With the adoption of a shunt compensation current method, the battery cells or battery pack can be subjected to independent power supply equalization, and the battery cells and battery pack can also be subjected to power supply equalization simultaneously, so that the capacity of each battery is kept consistent, the short-board effect of a battery string is avoided, and the service life of the battery is prolonged. The battery equalization circuit disclosed by the invention is simple to control, low in cost and small in size.