Thermal management in the vehicle overall

Intelligent cooling and heating

Thermal management centres around a highly efficient, intelligent system for cooling and heating the high-voltage components. This applies in particular to the high-voltage battery with 800-volt technology, but also to all other high-voltage components such as on-board DC chargers, DC/DC converters, on-board AC chargers and drive components such as electric motors, pulse-controlled inverters and transmissions. The cooling circuit is linked to the vehicle cooling circuit as required.

This prevents potential power losses due to excessive heat generation by always delivering the cooling capacity to exactly the components that need it. This ensures maximum flexibility for all operating modes and the vehicle requirements characteristic of a Porsche. At the same time, the Porsche Charging Planner (PCP) ensures that the optimum temperature is reached prior to arrival at the charging station.

On the hardware side, the thermal management system consists of a networked line system with a coolant radiator (front, left-hand when looked at in the direction of travel), three coolant pumps, six coolant valves, two fans and 10 coolant temperature sensors. This is supplemented by the linked components from the air-conditioning system with an A/C condenser (front, right-hand), a separate evaporator (chiller) and a heat exchanger for air-conditioning/cooling (iCond).

The entire system is controlled via a sophisticated, networked control unit.

The amount of drive power available from the high-voltage battery and whether it can be charged quickly depend on the charge level (SoC) and the cell temperature. This results in different temperature targets for the battery, depending on the initial state and the desired final state. The selected driving mode also plays a key role here. In Range mode, operation takes place with optimum efficiency for the drive and high-voltage battery in combination with minimal on-board power consumption (the speed of the coolant pumps is reduced, for example). In contrast, in the Sport or Sport Plus modes, the corresponding temperature targets for the coolant flow are selected for maximum performance of the electric motors and pulse-controlled inverters.

The control range is considerably broader than for a conventional combustion engine vehicle, for example. The circuits used in the thermal management of the overall vehicle alone add up to more than 300 states in the Taycan. The optimum energy state at a particular moment is always calculated and adjusted from this. High-availability targets, for example for Launch Control, are made possible by a significant and rapid decrease in the coolant temperature. Thermal pre-conditioning for extra quick charging at the calculated place of arrival or pre-calculated arrival time is also possible.

The battery
The charging process