Power supply device for motor vehicle i.e. electrically operated vehicle, has direct current converter switched between charging battery and traction battery to supply traction battery with power of charging battery

摘要

The device has a traction battery (1) i.e. lithium-ion-battery, for directly supplying battery voltage to an electric drive (2) of a motor vehicle, and a charging battery (3) charging the traction battery. The charging battery provides another battery voltage that is different from the former battery voltage. A direct current converter (4) is switched between the charging battery and the traction battery to convert the latter battery voltage to the level of the former battery voltage and to supply the traction battery with power of the charging battery.