Circuit/System Description

The hybrid/EV battery contains 4 high voltage contactors for normal operation and regular (AC) charging, and 1 module. In vehicles with DC charging capability, there are two additional DC contactors that are housed in the battery charger - DC. The high voltage contactors allow the high voltage DC batteries to be connected to the vehicle or safely contain the high voltage DC within the hybrid/EV battery assembly. The 6 high voltage contactors consist of a main positive high voltage contactor, main negative high voltage contactor, AC charge positive high voltage contactor, precharge contactor, DC positive contactor, and DC negative contactor. The 1 module is the hybrid/EV battery pack coolant heater module. The contactors and module close and open in a specific sequence controlled by the hybrid/EV powertrain control module 2. The hybrid/EV powertrain control module 2 supplies voltage to the control circuit for the high voltage contactors/module. Ground is provided through the case ground and chassis.

The hybrid/EV powertrain control module 2 measures internal voltages, currents, and temperatures within the battery charger - DC and charge receptacle and verifies they are within the proper range. During DC charging the hybrid/EV powertrain control module 2 monitors for the charging cable being disconnected while under load during DC charging.