Power system with hydrogen on demand

• US 7,629,707 B2
• Filed: 06/15/2005
• Issued: 12/08/2009
• Est. Priority Date: 06/15/2005
• Status: Active Grant

• Current Assignee: T-Mobile Innovations LLC (Deutsche Telekom AG)
• Original Assignee: Sprint Communications Company LP (Deutsche Telekom AG)
• Inventors: Johnson, Larry L., Willets, Julie A., Meyers, Jerry D.
• Primary Examiner(s): PALADINI, ALBERT WILLIAM
• Application Number:
  US11/153,806
• Publication Number:
  US 20060286416A1
• Time in Patent Office: 1,637 Days
• Field of Search: 307 64- 66, 60/392.81, 607/73, 607/93
• US Class Current: 307/66
• CPC Class Codes: H01M 16/006 of fuel cells with rechargeable batteries
• CPC Class Codes: H01M 8/04208 Cartridges, cryogenic media or cryogenic reservoirs
• CPC Class Codes: H01M 8/065 by dissolution of metals or alloys; by dehydriding metallic substances
• CPC Class Codes: Y02E 60/10 Energy storage using batteries
• CPC Class Codes: Y02E 60/50 Fuel cells
• CPC Class Codes: Y02P 90/40 Fuel cell technologies in production processes

Abstract

The present invention is a power system using a reformer/fuel cell arrangement as the primary source of DC power. The reformer is operated on either natural gas or propane. A backup source of power consumes hydrogen which is diffused from a solid medium. On an as-needed basis, the medium is reacted to release hydrogen gas which is consumed by a fuel cell to generate backup DC power. The system also includes Lithium-Metal-Polymer batteries which are used for both bridging and backup purposes.

Claims

1. A method of providing electrical power to a power-consuming device in a circuit, said method comprising:

providing a primary power supply that comprises a first fuel cell and a spare fuel cell, wherein the primary power supply is configured as a primary source of the electrical power to the power-consuming device;

detecting that neither the first fuel cell nor the spare fuel cell is available;

incorporating an output of a backup fuel cell into said circuit;

providing a backup fuel source to release the hydrogen from a solid storage medium;

releasing said hydrogen from a solid storage medium by a process comprising;

(a) providing an aqueous solution that serves as a diffusion catalyst;

(b) introducing the aqueous solution to the solid storage medium within a containment vessel; and

(c) causing a chemical reaction to occur that extracts the hydrogen from the solid storage medium in vapor form; and

noncombustibly consuming said released hydrogen in said backup fuel cell to provide the electrical power to said power-consuming device.

2. The method of claim 1, comprising:

including at least one energy-storage device in said circuit; and

eliminating power drops in said circuit using said at least one energy-storage device.

3. The method of claim 2, wherein said including step further comprises:

providing at least one LMP battery to serve as said at least one energy-storage device in said circuit.

4. The method of claim 1, comprising:

executing said releasing step when a primary fuel source that supplies fuel to the primary power source is unavailable.

5. The method of claim 1 wherein said providing step comprises:

selecting a chemical compound to serve as said solid storage medium.

6. The method of claim 1 wherein said providing step comprises:

selecting a metal hydride to serve as said solid storage medium.

7. The method of claim 1 wherein said providing step comprises:

selecting sodium borohydride (NaBH₄) to serve as said solid storage medium.

8. A system for maintaining power in a DC circuit, said system comprising:

a primary power supply of DC electrical power comprising a first fuel cell and a spare fuel cell that are adapted to receive fuel from a primary fuel source, convert hydrogen extracted from the fuel into DC electrical power in an alternating manner, and introduce the DC electrical power into said circuit;

a control system for detecting that the first fuel cell and the spare fuel cell are both unavailable, and for activating a backup fuel source that supplies hydrogen gas to a backup fuel cell;

the backup fuel source comprising;

(a) a solid storage medium in which said hydrogen gas is included;

(b) an aqueous solution that serves as a diffusion catalyst; and

(c) a separating system that introduces the aqueous solution to the solid storage medium, thereby creating a chemical reaction that releases said hydrogen gas; and

the backup fuel source adapted to noncombustibly consume the hydrogen gas, to generate DC electrical power from the hydrogen gas, and to deliver the DC electrical power to said circuit.

9. A system for providing backup electrical power, said system comprising:

a gas-extraction device for extracting a first source of hydrogen gas from fuel supplied by a primary fuel source;

a first gas-consuming device for noncombustibly using said first source of hydrogen gas to create a first source of electrical power, wherein the first gas-consuming device comprises a first fuel cell and a spare fuel cell that are adapted to convert the hydrogen gas extracted from the fuel into the electrical power in an alternating manner;

a backup fuel source that supplies hydrogen gas to a backup fuel cell upon detecting that the first gas-consuming device is unavailable, the backup fuel source comprising;

(a) second source of gas included in a solid storage medium;

(b) an aqueous solution that serves as a diffusion catalyst; and

(c) a separating system that introduces the aqueous solution to the solid storage medium, thereby creating a chemical reaction that releases said hydrogen gas; and

the backup fuel source adapted to noncombustibly consume the hydrogen gas and to generate electrical power from the hydrogen gas.

10. The system of claim 9 wherein said solid storage medium comprises a metal hydride.

11. The system of claim 9 wherein said solid storage medium comprises sodium borohydride (NaBH₄).

12. The system of claim 9 wherein said solid storage medium comprises a solid compound.

13. The system of claim 9 comprising:

at least one LMP battery for maintaining constant power.

14. The system of claim 9 comprising:

a circuit for receiving both said first and second electrical sources of power; and

a power-consuming device included in said circuit.

15. The system of claim 9 wherein said source of fuel is a propane tank and said system is operable independently without contribution from a utility company.