Structure of battery disconnection unit for electric vehicle

摘要

A structure of a battery disconnection unit for an electric vehicle comprises a first high voltage relay switching to a position for supplying DC power supplied from the battery to the inverter or to a position for interrupting the supply of the corresponding DC power; a second high voltage relay switching to a position for supplying DC power supplied from the charger to the battery or to a position for interrupting the supply of the corresponding DC power; a PCB including a printed wired circuit electrically connected to the second high voltage relay and providing a DC power supply path between the charger and the battery; a substrate installed to support the first and second high voltage relays; and a metal bracket supporting the PCB and the substrate and operating as a heat sink radiating heat.

主权项

1. A battery disconnection unit for an electric vehicle, the electric vehicle having a battery for providing DC power, a charger for converting AC power into DC power and for charging the battery with the DC power, and an inverter for converting DC power from the battery into AC power and for providing the converted AC power to a motor, the battery disconnection unit comprising:
a first high voltage relay electrically connected between the battery and the inverter, the first high voltage relay switching to either a position for supplying DC power from the battery to the inverter or to a position for interrupting the supply DC power from the battery; a second high voltage relay electrically connected between the charger and the battery, the second high voltage relay switching to either a position for supplying DC power from the charger to the battery or to a position for interrupting the supply of DC power from the charger; a printed circuit board including a printed wired circuit electrically connected to the second high voltage relay and providing a DC power supply path between the charger and the battery via an input terminal connected to the charger and an output terminal connected to the battery; a substrate installed at a position higher than the printed circuit board, the substrate supporting the first and second high voltage relays; a metal bracket supporting a lower side of the printed circuit board and substrate and providing a heat sink for radiating heat; a heater controlling an ambient temperature of the battery; and a metal oxide semiconductor field effect transistor fixedly installed on the metal bracket, the field effect transistor controlling the heater to turn on or off in order to radiate heat to the metal bracket through heat conduction.