Fuel cell power supply system

• US 5,858,568 A
• Filed: 09/19/1996
• Issued: 01/12/1999
• Est. Priority Date: 09/19/1996
• Status: Expired due to Fees

• Current Assignee: ZTEK Corporation
• Original Assignee: ZTEK Corporation
• Inventors: Hsu, Michael S., Ong, Robin Y. P.
• Primary Examiner(s): Kalafut, Stephen
• Assistant Examiner(s): CHANEY, CAROL DIANE
• Application Number:
  US08/710,562
• Time in Patent Office: 845 Days
• Field of Search: 429/12, 429/13, 429/19, 429/33, 180/60, 180/65.1, 180/65.3
• US Class Current: 429/425
• CPC Class Codes: B60L 2200/26 Rail vehicles
• CPC Class Codes: B60L 58/30 for monitoring or controlling fuel cells
• CPC Class Codes: B60L 58/33 by cooling
• CPC Class Codes: B60L 58/34 by heating
• CPC Class Codes: H01M 16/003 of fuel cells with other electrochemical devices, e.g. capacitors, electrolysers
• CPC Class Codes: H01M 2250/10 Fuel cells in stationary systems, e.g. emergency power source in plant
• CPC Class Codes: H01M 2250/20 Fuel cells in motive systems, e.g. vehicle, ship, plane
• CPC Class Codes: H01M 2250/402 Combination of fuel cell with other electric generators
• CPC Class Codes: H01M 8/04268 Heating of fuel cells during the start-up of the fuel cells
• CPC Class Codes: H01M 8/04619 of fuel cell stacks
• CPC Class Codes: H01M 8/04992 characterised by the implementation of mathematical or computational algorithms, e.g. feedback control loops, fuzzy logic, neural networks or artificial intelligence
• CPC Class Codes: Y02B 90/10 Applications of fuel cells in buildings
• CPC Class Codes: Y02E 60/50 Fuel cells
• CPC Class Codes: Y02T 90/40 Application of hydrogen technology to transportation, e.g. using fuel cells
• CPC Class Codes: Y10S 429/90 Fuel cell including means for power conditioning, e.g. Conversion to ac

Abstract

A power supply system for enhancing the economic viability of different modes of transportation that incorporate fuel cells to generate electricity. For example, the power supply system of the present invention provides for the off-board use of the electric power generated by an on-board power plant, such as a fuel cell, of a mobile vehicle power system, such as an electric car. Off-board use, or use remote from the vehicle, of the electrical power includes the delivery of power to a remote site. Off-board stations are provided for delivery of fuel to the vehicle and/or for receiving the electrical power generated by the fuel cell. The off-board station and the vehicle are appropriately equipped for quick and easy interconnection such that electrical power is drawn from the fuel cell for off-board use.

Claims

1. A power system for converting fuel to electricity, comprising a mobile vehicle fuel cell power system and an off-board station, the mobile vehicle fuel cell power system includes

a rechargeable battery,

motor means coupled to said battery for propelling the vehicle,

a fuel cell for converting fuel to electrical power and for connection to said battery to recharge said battery for powering,

storage means for storing fuel for said fuel cell, and

means for coupling to said off-board station for delivering thereto electrical power generated by said fuel cell when not required for propelling the mobile vehicle,

and said off-board station includes

means for receiving electrical power from said mobile vehicle fuel cell power system, and

output means for providing at least a portion of said electrical power for use off-board of said mobile vehicle fuel cell power system.

2. The power system of claim 1 wherein said off-board station further comprises means for delivering fuel to said mobile vehicle fuel cell power system, and said mobile vehicle fuel cell power system includes means for receiving fuel from said off-board station for provision to said fuel cell.

3. The power system of claim 2 wherein said fuel comprises a hydrocarbon fuel.

4. The power system of claim 2 wherein said fuel is a hydrocarbon fuel, and said mobile vehicle fuel cell power system is capable of reforming the hydrocarbon fuel.

5. The power system of claim 2 further including a fuel meter for metering the fuel delivered to said mobile vehicle power system fuel cell.

6. The power system of claim 1 wherein said mobile fuel cell power system includes inverting means for converting direct current generated by said fuel cell to alternating current for on-board or off-board use.

7. The power system of claim 1 wherein said off-board station further includes inverting means for converting the electrical power supplied to said station from said mobile vehicle fuel cell power system from direct current to alternating current for use off-board of said mobile vehicle fuel cell power system.

8. The power system of claim 7 wherein said off-board station further includes power meter means for measuring the amount of alternating current power supplied by said output means for off-board use.

9. The power system of claim 1 wherein the electrical power provided by said output means for off-board use is direct current electrical power, and wherein said power system further includes a direct current power meter for measuring said direct current electrical power.

10. The power system according to claim 2 wherein said fuel cell is chosen from the group consisting of a solid oxide fuel cell, a molten carbonate fuel cell, a phosphoric acid fuel cell, an alkaline fuel cell, and a proton exchange membrane fuel cell.

11. The power system according to claim 2 wherein said mobile vehicle fuel cell power system further includes at least one of a fuel reformer and a fuel shifter to produce hydrogen-containing fuel for said fuel cell.

12. The power system of claim 11 further including a fuel meter for metering the fuel delivered to said power system.

13. The power system of claim 11 wherein the off-board station includes water supply means for providing water to said fuel reformer.

14. The power system of claim 11 wherein said off-board station further includes inverting means for converting the electrical power supplied to said station by said mobile vehicle fuel cell power system from direct current to alternating current, and wherein said output means provides said alternating current for use off-board of said mobile vehicle fuel cell power system.

15. The power system of claim 14 wherein said off-board station further includes power meter means for measuring the amount of alternating current power supplied by said output means for off-board use.

16. The power system of claim 11 wherein the electrical power provided by said output means for off-board use is direct current electrical power, and wherein said power system further includes a direct current power meter for measuring said direct current electrical power.

17. The power system of claim 11 wherein said fuel cell is chosen from the group consisting of a solid oxide fuel cell, a molten carbonate fuel cell, a phosphoric acid fuel cell, an alkaline fuel cell, and a proton exchange membrane fuel cell.

18. The power system of claim 2 further wherein said off-board station further comprises

a fuel reformer for producing a hydrogen-containing fuel from a hydrocarbon fuel, and

a second fuel storage means for storing said hydrogen-containing fuel produced by said fuel reformer.

19. The power system according to claim 18 further including a fuel meter for metering the fuel delivered to said mobile vehicle power system fuel cell.

20. The power system of claim 18 wherein said off-board station includes means for supplying water to said reformer.

21. The power system of claim 18, wherein said off-board station further comprises a fuel shifter for receiving hydrogen-containing fuel from said fuel reformer and for producing from said hydrogen-containing fuel a hydrogen fuel for supply to said mobile vehicle fuel cell power system.

22. The power system of claim 18 wherein said off-board station further includes

inverting means for converting the electrical power received from said mobile vehicle fuel cell power system from direct current to alternating current, wherein said output means provides alternating current for use off-board of said mobile vehicle fuel cell power system, and

power meter means for measuring the amount of alternating current power supplied by said output means for off-board use.

23. The power system of claim 18 wherein the electrical power provided by said output means for off-board use is direct-current electrical power, and wherein said power system further includes a direct-current power meter for measuring direct-current electrical power.

24. The power system according to claim 18 wherein said fuel cell is chosen from the group consisting of a solid oxide fuel cell, a molten carbonate fuel cell, a phosphoric acid fuel cell, an alkaline fuel cell, and a proton exchange membrane fuel cell.

25. A power system, comprising

an off-board station for use with a mobile vehicle fuel cell power system having a fuel cell for converting fuel to electrical power,

electrical connection means adapted for receiving electrical power generated by the fuel cell of the mobile vehicle fuel cell power system and adapted for supplying power generated by the fuel cell for use off-board from said mobile vehicle fuel cell power system, and

communication means for communicating information regarding at least one of the on-board fuel cell operation and off-board station condition parameters to another location.

26. The power system of claim 25 further including fuel supply means for supplying fuel to a mobile vehicle fuel cell power system from the off-board station.

27. The power system of claim 25 further comprising securing means for preventing unwanted access to the fuel and electric connections.

28. The power system of claim 26 further including means for supplying a reactant to said mobile vehicle fuel cell power supply system for use in a fuel reformation process from the off-board station.

29. The power system of claim 28 wherein the reactant supply means includes means for supplying water.

30. The power system of claim 29 wherein the water supply further includes means for preventing said water from freezing.

31. The power system of claim 25 wherein the communication means comprises at least one telecommunication link.

32. The power system of claim 26 further including a fuel meter for metering the fuel provided to said mobile vehicle power system fuel cell by said fuel supply means.

33. The power system of claim 26 further including inverting means for converting electrical power received from said mobile vehicle fuel cell power system from direct current to alternating current, wherein said electrical connection means provides at least a portion of said alternating current for use off-board of said mobile vehicle fuel cell power system.

34. The power system of claim 33 further including power meter means for measuring the amount of alternating current power supplied by said electrical connection means for off-board use.

35. The power system of claim 27 wherein the securing means includes at least one locked enclosure configured to house one of the fuel and electrical connections.

36. The power system of claim 35 wherein said enclosure includes a glass panel mounted on one wall thereof, and a striking element coupled to the enclosure for breaking the glass panel to access said connections.

37. The power system of claim 26 wherein at least one of said fuel supply means and said electrical connection means includes a connector for selected disconnection and connection of said connector to and from said mobile vehicle fuel cell power system.

38. The power system of claim 25, further comprising a gas turbine generator operating in tandem with said mobile fuel cell power system for converting said fuel to electricity.

39. The power system of claim 25, further comprising a heating, ventilation and air conditioning unit operating in tandem with said mobile fuel cell power system for converting said fuel to electricity.

40. A power system for converting fuel to electricity, comprising a first mobile vehicle fuel cell power system and a second mobile electrical power system, the first mobile vehicle fuel cell electric power system including

a first rechargeable battery,

a fuel cell for converting fuel to electricity and for connection to said battery to recharge said battery,

a storage means for storing fuel for said fuel cell, and

means for coupling to said second mobile power system for delivering thereto electrical power generated by said fuel cell,

and said second mobile power system including

a second rechargeable battery, and

means for receiving electrical power from said first mobile vehicle fuel cell power system so as to recharge said second battery.

41. A power system for converting fuel to electricity, comprising a mobile vehicle power system and an off-board station, the mobile vehicle power system including

a rechargeable battery,

power plant means for propelling the vehicle and for conversion of fuel to electrical power and for recharging said battery,

a storage means for storing fuel for said power plant, and

means for electrical coupling to said off-board station for delivering thereto electrical power generated by said power plant,

and said off-board station including

means for receiving electrical power from said mobile vehicle power plant, and

output means for providing at least a portion of said electrical power for use off-board of said mobile vehicle power system.

42. The power system of claim 41 wherein said mobile vehicle power system includes means for receiving fuel from said off-board station for provision to said power plant, and said off-board station includes means for delivering fuel to said mobile vehicle power system.