Power supply device, power supply method and electric vehicle

Abstract

The invention discloses a power supply device. The power supply device comprises a high-voltage power battery, a standby DC-DC, a vehicle-mounted low-voltage accumulator and a battery manager; the high-voltage power battery is used for providing power to an electric vehicle and providing high voltage to high-voltage electric equipment; the standby DC-DC is connected with the high-voltage power battery in parallel, and is used for converting the high voltage provided by the high-voltage power battery to low voltage; the vehicle-mounted low-voltage accumulator is connected with the low-voltage electric equipment and the standby DC-DC in parallel, and is used for providing the low voltage to the low-voltage electric equipment and the battery manager; and the battery manager is used for starting the standby DC-DC when the electric vehicle needs maintenance or the voltage of the vehicle-mounted low-voltage accumulator is lower than a preset threshold. The invention further provides a power supply method and the electric vehicle. When the power supply device is used, even if the voltage of the vehicle-mounted low-voltage accumulator is deficient, the low-voltage power supply still can be performed on the low-voltage electric equipment of the electric vehicle under the condition of not replacing the vehicle-mounted low-voltage accumulator.

Description

technical field [0001] The present invention relates to the field of power supply equipment, in particular to a power supply device, a power supply method and an electric vehicle including the power supply device. Background technique [0002] At present, when the vehicle is being maintained, for the sake of safety, it is necessary to disconnect the high-voltage system in the vehicle, and at this time the vehicle-mounted DC-DC does not work. However, in the process of maintaining the vehicle, it is still necessary to provide a low-voltage power supply on the vehicle. There are many low-voltage power supply equipment on the electric bus, and there are many electrical equipment. The low-voltage system is completely powered by the low-voltage battery. At this time, the power of the low-voltage battery on the vehicle cannot be replenished, which will easily lead to the rapid depletion of the battery. [0003] Therefore, how to provide low-voltage power supply to the vehicle whe...

AI Technical Summary

Problems solved by technology

However, in the process of maintaining the vehicle, it is still necessary to provide a low-voltage power supply on the vehicle

There are many low-voltage power supply equipment on the electric bus, and there are many electrical equipment. The low-voltage system is completely powered by the low-voltage battery. At this time, the power of the low-voltage battery on the vehicle cannot be replenished, which will easily lead to the rapid depletion of the battery power.

Images