... converts the electronic control system into the three-phase current required for the synchronous motors. Two low-temperature cooling circuits ensure balanced operating temperatures for the four electric motors and the power electronics. A separate low-temperature circuit is responsible for cooling the lithium-ion high-voltage battery. At low outside temperatures, the battery is quickly brought to the optimum operating temperature by means of an electric heating element. At extremely high outside temperatures, the cooling circuit can also be cooled using the air conditioning system. This should also benefit the overall service life of the battery.