Example: Charging high-voltage battery with direct current (DC) while cooling is active
684_037
In the high-voltage battery cooling circuit, the coolant flows through high-voltage battery 1 AX2, changeover and mixing valve 4
for thermal management V653 directly to changeover and mixing valve 7 for thermal management V656. From there, it travels
through the heat exchanger for high-voltage battery A, changeover and mixing valve 4 for thermal management V653 and to cool-
ant pump for high-voltage battery V590. In the heat exchanger for high-voltage battery, the thermal energy from the coolant is
transferred to the refrigerant in the refrigerant circuit for cooling high-voltage battery 1 AX2. The thermal energy is released into
the atmosphere with the help of the condenser 1.
During DC charging, the coolant circuit for the electric powertrain is also active.
Thermal management coolant pump 4 V620 pumps coolant through voltage converter for 800 V, 400 V, 48 V, 12 V A48 and power
contactor with boost function J1178, directly to changeover and mixing valve for thermal management V650 and then to mixing
valve 2 for thermal management V651. The position of coolant changeover valve 2 N633 regulates the amount of coolant which
flows through the low-temperature radiator 8. The coolant flows back to thermal management coolant pump 4 V620 from coolant
changeover valve 2 N633.
A regulated portion of the warm coolant can branch off downstream of changeover and mixing valve for thermal manage-
ment V650 into the heating circuit and become mixed with the coolant there. Thermal management coolant pump 2 V618 trans-
ports the coolant through coolant changeover valve 1 N632 back into the coolant circuit for the electric powertrain.
207
English 
