Meaning
Auxiliary energy consumed by the coolant circulation pump to maintain thermal management in a liquid-cooled battery pack. The pump electrical parasitic power represents a continuous draw on the battery’s energy reserve, which directly reduces the overall system efficiency and vehicle driving range. It must be minimized through optimized fluid dynamics and efficient motor selection.
System Efficiency
Operating a high-voltage battery requires continuous coolant flow to manage heat, and this auxiliary load can consume several percent of the total stored energy. This consumption reduces the net energy available for propulsion, particularly during heavy thermal loads or fast charging. Sourcing highly efficient brushless motors for the pump assemblies helps mitigate these losses.
Thermal Control
Coolant flow rates must be dynamically adjusted to balance cell temperature uniformity with auxiliary energy consumption. High flow rates reduce cell temperature gradients but increase the resistance in the cooling circuit, demanding more power from the pump. Control algorithms optimize this trade-off by reducing pump speed when thermal loads are minimal.
Design Minimization
Fluid channel geometries with low pressure drop reduce the mechanical work required to circulate the coolant. Smooth internal surfaces, wider channels, and minimal bends are incorporated into the cooling plate design to lower flow resistance. These mechanical optimizations allow engineers to specify smaller pumps with lower power requirements, reducing weight and cost.
The resulting reduction in power consumption improves the vehicle’s driving range during highway cruising where cooling demands remain continuous.
