Electric vehicle hybrid battery system
An electrically-powered vehicle comprising a hybrid battery system is disclosed. The vehicle comprises a motor and a hybrid battery system coupled to the motor. The hybrid battery system comprises a first battery of a first energy density and a first power density and a second battery in parallel with the first battery. The second battery has a second energy density lower than the first energy density and a second power density greater than the first power density. The vehicle is configured to draw power disproportionally from the first battery in a first mode and disproportionally from the second battery in a second mode.
1. An electrically-powered vehicle, comprising:
a plurality of motors, each associated with a corresponding rotor powered by the motor and each motor being mounted in a housing associated specifically with the rotor powered by that motor and
a hybrid battery system coupled to the motor, comprising:
a first battery of a first energy density, a first power density, and a first battery pack resistance, the first battery being coupled to each of the motors in the plurality of motors and wherein the first battery is located in a central fuselage of the electrically-powered vehicle; and
a set of batteries of a second battery type each battery in the second set being connected in parallel with the first battery to a corresponding one of the motors and being housed together with the corresponding motor in the housing associated specifically with the rotor powered by that motor wherein each battery of the second battery type has a second energy density lower than the first energy density and a second power density greater than the first power density and has a second battery pack resistance that is lower than the first battery pack resistance,
wherein the vehicle is configured to draw power disproportionally from the first battery in a first mode and disproportionally from the batteries of the second battery type in a second mode, including by shifting load passively from the first battery to the batteries of the second battery type in the second mode, while drawing power simultaneously from both the first battery and the respective batteries of the second battery type, at least in part due to the difference between the first battery pack resistance and the second battery pack resistance.
2. The system of claim 1 , wherein the first battery and the batteries of the second battery type are in parallel with a the respective motors.
3. The system of claim 1 , wherein the batteries of the second battery type are stored outboard in the vehicle.
4. The system of claim 1 , wherein the first mode comprises a low power mode.
5. The system of claim 1 , wherein the second mode comprises a high power mode.
6. The system of claim 1 , wherein the first battery and the batteries of the second battery type are switched in to or out of a shared bus.
7. The system of claim 1 , wherein the first battery drops in voltage more significantly under load than the batteries of the second battery type such that greater current is drawn from the batteries of the second battery type under high load.
8. The system of claim 1 , wherein the first battery has a larger battery cell count than the batteries of the second battery type y.
9. The system of claim 1 , wherein the first battery comprises a cylindrical battery.
10. The system of claim 1 , wherein the second battery type comprises a pouch battery.
11. The system of claim 1 , wherein the vehicle comprises an aircraft.
12. The system of claim 1 , wherein the vehicle comprises a vertical take-off and landing aircraft.
13. The system of claim 1 , wherein the first mode comprises a cruise or steady-state flight mode and the second mode comprises take-off or landing.
14. The system of claim 12 , wherein the batteries of the second battery type provide enough power to vertically land the aircraft in the absence of the first battery.
15. The system of claim 14 , wherein the batteries of the second battery type are each individually capable of powering a single motor that is located near each battery, respectively.
16. The system of claim 15 , wherein the batteries of the second battery type are in parallel with the first battery and the first battery provides power to the respective motors associated with each of the batteries of the second battery type and one or more additional batteries of high power densities in at least the first mode of operation.