Battery voltage equalization circuit

The utility model provides a battery voltage equalization circuit which comprises an energy conversion module, a main control circuit module, a switch circuit module connected with each monomer battery and a voltage collecting module, wherein the switch circuit module and the voltage collecting module are switched in the main control circuit module; the energy conversion module is connected with each monomer battery through the switch circuit module; the monomer batteries are even and are mutually connected in series, and are divided into a plurality of groups. Through the battery voltage equalization circuit provided by the utility model, the voltage electricity quantity equalization among each battery pack and each monomer battery in the battery packs can be realized accurately, and the battery voltage equalization circuit has the advantages of simple circuit structure, unidirectional equalization, high efficiency, low cost and the like.