BATTERY VOLTAGE EQUALIZATION DEVICE

A battery voltage equalization device includes: a transformer T including a primary winding T into which the output voltage of a battery pack BP is inputted and a plurality of secondary windings T corresponding to each of batteries B; a conversion circuit that converts an AC voltage outputted by the secondary windings T to a DC voltage; a cutoff circuit provided to cut off a conductive pathway from the conversion circuit to the batteries B; and a control unit that controls the energization of the primary winding T wherein the cutoff circuit includes a first switch SW and the second switch SW which are provided in series on the conductive pathway and which are opened or closed by the control unit, a first body diode Db and a second body diode Db of which the same terminals are connected to each other and which are respectively connected in parallel with the switches, and a surge suppression resistor Rss connected in parallel with the first body diode Db or the second body diode Db for which the direction of charging current to the batteries B is the forward direction.