Portable fuel cell power supply

• US 6,268,077 B1
• Filed: 03/01/1999
• Issued: 07/31/2001
• Est. Priority Date: 03/01/1999
• Status: Expired due to Term

• Current Assignee: Google Technology Holdings LLC (Alphabet Inc.)
• Original Assignee: Motorola, Inc. (Motorola Solutions, Inc.)
• Inventors: Kelley, Ronald J., Pratt, Steven D., Landreth, Bobby Dean, Pennisi, Robert W., Muthuswamy, Sivakumar, Urbish, Glenn F.
• Primary Examiner(s): Maples, John S.
• Application Number:
  US09/260,097
• Time in Patent Office: 883 Days
• Field of Search: 429/33, 429/22, 429/30, 429/34
• US Class Current: 429/421
• CPC Class Codes: H01M 8/04089 of gaseous reactants
• CPC Class Codes: H01M 8/04761 of fuel cell exhausts
• CPC Class Codes: H01M 8/065 by dissolution of metals or alloys; by dehydriding metallic substances
• CPC Class Codes: H01M 8/1007 with both reactants being gaseous or vaporised H01M8/12 takes precedence
• CPC Class Codes: H01M 8/247 Arrangements for tightening a stack, for accommodation of a stack in a tank or for assembling different tanks
• CPC Class Codes: Y02E 60/50 Fuel cells

Abstract

The invention provides a device for generating energy, utilizing a fuel cell. Air is freely guided to the fuel cell, while a fuel gas is provided to the fuel cell from a pressurized fuel supply via a regulator. The portable power supply is most applicable to use with handheld electric devices, and contains a fuel storage means (110) for storing a supply of fuel, a fuel delivery means (120) connected to the fuel storage means, an energy conversion device (140) connected to the fuel delivery means for converting the fuel to electricity. The fuel storage means, the fuel delivery means, and the energy conversion device are all contained in a volume less than 500 cubic centimeters.

Claims

1. A portable power supply, comprising:

a fuel storage means for storing a supply of hydrogen fuel occluded as a metal hydride or in graphite nanofibers;

a fuel delivery means, connected to the fuel storage means;

an air breathing planar fuel cell having a cathode side exposed to ambient air and connected to the fuel delivery means, for converting the fuel to electricity; and

wherein the fuel storage means, the fuel delivery means, and the air breathing planar fuel cell are all contained in a volume less than 100 cubic centimeters and the portable power supply delivers at least one watt of power.

2. The portable power supply as described in claim 1, further comprising a housing for containing the fuel storage means, the fuel delivery means, and the air breathing planar fuel cell.

3. A device for generating energy, comprising:

a passive air breathing planar fuel cell having a cathode exposed to air;

a fuel storage unit for containing a supply of hydrogen fuel occluded as a metal hydride or in graphite nanofibers;

a regulating means disposed between and connected to the fuel cell and to the fuel storage unit, to regulate the amount of fuel emanating from the fuel storage unit into the fuel cell; and

a housing having an internal volume no greater than 1000 cubic centimeters, for containing the fuel cell and the fuel storage unit and the regulating means therein.

4. The device for generating electricity as described in claim 3, wherein the internal volume of the housing is less than 500 cubic centimeters.

5. A device for generating electricity, comprising:

a planar fuel cell for electricity generation by catalytic combustion of gaseous hydrogen fuel with oxygen gas from ambient air, said fuel cell comprising an anode, a cathode, and a solid polymer electrolyte disposed between the anode and the cathode;

a fuel tank for containing a supply of hydrogen fuel occluded as a metal hydride or in graphite nanofibers;

a fuel delivery means disposed between and connected to the fuel tank and to the fuel supply, to regulate and deliver a sufficient amount of fuel from the fuel tank into the fuel cell; and

the combined volume of the fuel cell and the fuel tank and the fuel delivery means is no greater than 1000 cubic centimeters.

6. The device for generating electricity as described in claim 5, wherein the fuel delivery means is a pressure or flow controlling device.

7. The device for generating electricity as described in claim 6, wherein the fuel delivery means is a micromachined pressure or flow controlling device.

8. The device for generating electricity as described in claim 5, further comprising control electronics for altering the operation of the device.

9. The device for generating electricity as described in claim 5, wherein the fuel tank contains a hydrogen-containing chemical compound that liberates hydrogen gas.

10. The device for generating electricity as described in claim 5, wherein the fuel cell has a polymer electrode membrane.

11. The device for generating electricity as described in claim 5, wherein the fuel cell is an air breathing fuel cell.

12. The device for generating electricity as described in claim 5, wherein one portion of the housing is arranged to allow the fuel cell cathode to be exposed to ambient air to passively supply air to the cathode.

13. The device for generating electricity as described in claim 5, wherein the internal volume of the housing is less than 100 cubic centimeters.

14. The device for generating electricity as described in claim 5, further comprising attachment means for mechanically attaching said device to a radio, and interconnection means for electrically connecting said device to said radio.

15. A device for generating electricity, comprising:

a planar fuel cell for electricity generation by catalytic combustion of gaseous hydrogen fuel with oxygen gas from ambient air, said fuel cell comprising an anode, a cathode, and a solid polymer electrolyte disposed between the anode and the cathode;

a fuel tank for containing a supply of hydrogen fuel occluded as a metal hydride or in graphite nanofibers;

a fuel delivery means disposed between and connected to the fuel tank and to the fuel supply, to regulate and deliver a sufficient amount of fuel from the fuel tank into the fuel cell;

a power supply for use in starting the device; and

the combined volume of the fuel cell and the fuel tank and the fuel delivery means is no greater than 1000 cubic centimeters.

16. The device for generating electricity as described in claim 15, wherein the power supply is a battery, a capacitor, or a super capacitor.

17. A portable fuel cell power supply for use with handheld devices, comprising:

a hydride storage canister for storing a supply of hydrogen as a metal hydride;

a fuel delivery means, connected to the hydride storage canister;

an air breathing planar fuel cell having a polymer electrolyte membrane, connected to the fuel delivery means, for converting the hydrogen to electricity;

wherein the combined volume of the hydride storage canister, the fuel delivery means, and the air breathing planar fuel cell is less than 500 cubic centimeters; and

wherein the portable power supply provides at least eighty watts of electric power.

18. The portable fuel cell power supply as described in claim 17, further comprising a housing for containing the hydrogen storage canister, the fuel delivery means, and the air breathing planar fuel cell.

19. The portable fuel cell power supply as described in claim 18, wherein one portion of the housing is arranged to allow the fuel cell to be exposed to air.

20. A portable power supply for use with handheld devices comprises an air breathing planar fuel cell disposed in a housing such that a cathode side of the fuel cell is exposed to ambient air, a hydrogen storage means to store hydrogen occluded as a metal hydride or in graphite nanofibers disposed in the housing, a fuel delivery means connecting the hydrogen storage means to the fuel cell, and wherein the internal volume of the housing does not exceed 500 cubic centimeters.

21. The portable power supply as described in claim 20, wherein the volume of the air breathing planar fuel cell is less than twenty percent of the internal volume of the housing.

22. The portable power supply as described in claim 20, further comprising:

attachment means for mechanically attaching said portable power supply to a radio; and

interconnection means for electrically connecting said portable power supply to said radio.