Output balance device of rechargeable accumulator unit

The utility model discloses an output balance device of a rechargeable accumulator unit, which comprises a final voltage detecting circuit which is connected with an electro-optic coupling circuit connected with a pulse width modulation control circuit, the pulse width modulation control circuit is connected with a power-driven circuit which is connected with a switch transformer, and the switch transformer is connected with a rectifying filter circuit. The circuits are sealed in a module, and a wiring pole connected with the accumulator unit and a single accumulator is arranged on the module. The utility model can effectively prevent the whole unit of accumulators from discarding in advance because of performance difference of the single accumulators, and can prolong the service life of the accumulator unit.