Rechargeable Battery Apparatus

Abstract: The invention provides a rechargeable battery apparatus wherein, when secondary batteries having different terminal voltages are used in parallel connection, a back current is prevented and a loss which is produced in a diode for prevention of back current is reduced. A plurality of switch elements are individually connected in series to a plurality of secondary batteries, and diodes for prevention of back current for the secondary batteries are individually connected in parallel to the switch elements. Upon parallel charging or parallel discharging of the secondary batteries, voltages across the diodes are detected by a reverse bias detection circuit, and the switch element which corresponds to one of the diodes which exhibits a reverse bias voltage is switched on.

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