Motor controller operation-dependent thermal management system
A coupled battery and motor controller thermal management system is disclosed. In various embodiments, a motor controller and a heat sink are coupled thermally to a battery. At least a portion of waste heat generated by the motor controller is transferred to the thermal mass of the battery during at least a first mode of operation in which a relatively low amount of ambient air flows through the heat sink.
1. An assembly, comprising:
a battery having a thermal mass;
a motor controller coupled thermally to the battery, wherein the motor controller generates more waste heat during a first mode of operation of the motor controller than during a second mode of operation of the motor controller; and
a heat sink coupled thermally to the battery, the heat sink having a heat dissipation capacity that keeps at least a portion of the waste heat stored in the thermal mass of the battery during at least the first mode of operation of the motor controller, and releases at least the portion of the waste heat to flow out the battery during at least the second mode of operation of the motor controller.
2. The assembly of claim 1 , wherein the motor controller is configured to control a motor associated with an aircraft.
3. The assembly of claim 1 , wherein the motor controller is configured to generate at least 400 W of waste heat.
4. The assembly of claim 1 , further comprising: additional motor controllers coupled to the battery, wherein the motor controller and the additional motor controllers are configured to generate at least 3.2 kW of waste heat.
5. The assembly of claim 1 , wherein the heat sink is no heavier than 0.11 kg.
6. The assembly of claim 1 , wherein the heat sink is positioned at least in part between the motor controller and the battery.
7. The assembly of claim 6 , wherein the motor controller is mounted on a mounting plate comprising the heat sink.
8. The assembly of claim 1 , wherein the heat sink is positioned at least in part on top of the battery.
9. The assembly of claim 1 , wherein the heat sink includes a plurality of thermally conductive fins arranged in an array defining one or more airflow channels through the heat sink.
10. The assembly of claim 1 , wherein the battery includes a plurality of battery cells.
11. The assembly of claim 10 , wherein the battery cells are mounted within a battery enclosure of the battery and the battery cells are coupled thermally to the heat sink.
12. The assembly of claim 1 , wherein the motor controller is mounted on a first surface of the battery and the heat sink is mounted on a second surface of the battery.
13. The assembly of claim 1 , wherein the heat sink comprises an outer casing of one or both of the motor controller and the battery.
14. The assembly of claim 1 , wherein the thermal mass of the battery is larger than a thermal mass of the motor controller.
15. The assembly of claim 1 , wherein the battery and the motor controller of the assembly are those of an electric aircraft.
16. The assembly of claim 15 , wherein the first mode of operation comprises one or more of vertical flight, take off, hover, and landing.
17. The assembly of claim 15 , wherein the electric aircraft includes a plurality of lift fans, each of which has a corresponding motor controller.
18. The assembly of claim 17 , wherein each motor controller is coupled thermally to the thermal mass of the battery.
19. The assembly of claim 1 , wherein the motor controller is thermally coupled to the thermal mass of the battery by materials comprising a thermally conductive path.