Automobile power battery balance system

The utility model relates to an automobile power battery balance system, which comprises a balance control module, a monomer battery voltage collection module and a plurality of direct current to direct current (DC-DC) charging modules, wherein the balance control module is respectively and electrically connected with each DC-DC charging module through the monomer battery voltage collection module, preferably, the balance control module comprises a voltage data input unit, a voltage data comparison unit, a main controller unit and a control signal output unit, the monomer battery voltage collection module comprises a voltage data collection unit, a voltage data output unit and a DC-DC charging module control unit, and charging control signals are transmitted to each DC-DC charging module from the main controller unit through the control signal output unit and the DC-DC charging module control unit, so the voltage balance of each monomer battery is ensured. The automobile power battery balance system provided by the utility model has the advantages of ingenious design, simple and compact structure, little energy waste, high charging efficiency, good balance performance and wide use range.