Thermal management of liquid metal batteries
Provided herein are energy storage devices. In some cases, the energy storage devices are capable of being transported on a vehicle and storing a large amount of energy. An energy storage device is provided comprising at least one liquid metal electrode, an energy storage capacity of at least about 1 MWh and a response time less than or equal to about 100 milliseconds (ms).
1. A method for operating an energy storage system, comprising:
a) providing an energy storage system comprising a plurality of electrochemical cells supported by a frame structure, wherein an individual cell of the plurality of electrochemical cells comprises a negative electrode, an electrolyte and a positive electrode, wherein at least two of the negative electrode, the electrolyte and the positive electrode are in a liquid state at an operating temperature of the individual cell, wherein the frame structure comprises one or more fluid flow paths for bringing a thermal management fluid in thermal communication with at least a subset of the plurality of electrochemical cells; and
b) directing the thermal management fluid through the one or more fluid flow paths.
2. The method of claim 1 , wherein the thermal management fluid is directed through the one or more fluid flow paths to maintain a temperature of the individual cell, or cell parts thereof, at the operating temperature.
3. The method of claim 2 , wherein, upon directing the thermal management fluid through the one or more fluid flow paths, the temperature of the individual cell is maintained to within about +/−60° C.
4. The method of claim 2 , wherein, upon directing the thermal management fluid through the one or more fluid flow paths, the temperature of the individual cell fluctuates by at most about +/−60° C. in a time period of 5 hours or less.
5. The method of claim 1 , wherein the directing of the thermal management fluid is performed to maximize an efficiency and/or operating lifetime of the energy storage system.
6. The method of claim 1 , wherein the thermal management fluid is directed at a rate that is varied over time.
7. The method of claim 1 , wherein the thermal management fluid is directed at a rate that depends on: (a) a temperature of the energy storage system or an electrochemical cell thereof; (b) a rate of change of the temperature of the energy storage system or an electrochemical cell thereof; (c) whether the energy storage system is charging, discharging or idle; (d) an anticipated future operation of the energy storage system; or (e) a current or anticipated market condition.
8. The method of claim 7 , wherein the anticipated future operation of the energy storage system comprises a time and extent of future charging, discharging or idle operation of the energy storage system.
9. The method of claim 7 , wherein the current or anticipated market condition comprises a price of energy.
10. The method of claim 1 , wherein the thermal management fluid is directed through the one or more fluid flow paths with an aid of a fluid flow system in fluid communication with the one or more fluid flow paths.
11. The method of claim 10 , wherein the fluid flow system comprises a fan, pump or convection-assisted flow.
12. The method of claim 1 , wherein the directing the thermal management fluid through the one or more fluid flow paths dissipates or adds thermal energy from the plurality of electrochemical cells at a rate of at least about 1 Watt.
13. The method of claim 1 , wherein the directing the thermal management fluid through the one or more fluid flow paths dissipates thermal energy from or adds thermal energy to the plurality of electrochemical cells at a rate of at most about 100 kilo-Watts.
14. The method of claim 1 , further comprising rapidly cooling at least a portion of the energy storage system in response to a potentially hazardous event.
15. The method of claim 4 , wherein the potentially hazardous event is an earthquake or a cell breach.
16. The method of claim 4 , wherein, upon rapidly cooling, a temperature of a hottest of the plurality of electrochemical cells decreases from its operating temperature to a temperature below a freezing point of the electrolyte in less than about 4 hours.
17. The method of claim 1 , wherein the directing the thermal management fluid through the one or more fluid flow paths comprises directing the thermal management fluid through a plurality of fluid flow paths.
18. The method of claim 1 , wherein the thermal management fluid is directed using forced or natural convection.
19. The method of claim 18 , wherein flow of the thermal management fluid is directed using the natural convection and is controlled by an actuator that opens a given fluid flow path of the one or more fluid flow paths.