Modular regenerative fuel cell system

• US 8,003,268 B2
• Filed: 03/28/2006
• Issued: 08/23/2011
• Est. Priority Date: 03/31/2005
• Status: Active Grant

• Current Assignee: William F. Smith
• Original Assignee: William F. Smith
• Inventors: Smith, William F.
• Primary Examiner(s): Ryan; Patrick
• Assistant Examiner(s): THOMAS, BRENT C
• Application Number:
  US11/390,593
• Publication Number:
  US 20060222912A1
• Time in Patent Office: 1,974 Days
• Field of Search: 429/21, 429/418
• US Class Current: 429/418
• CPC Class Codes: C25B 9/70 Assemblies comprising two or more cells
• CPC Class Codes: H01M 16/006 of fuel cells with rechargeable batteries
• CPC Class Codes: H01M 8/04201 Reactant storage and supply, e.g. means for feeding, pipes
• CPC Class Codes: H01M 8/0432 Temperature; Ambient temperature
• CPC Class Codes: H01M 8/0438 Pressure; Ambient pressure; Flow
• CPC Class Codes: H01M 8/0444 Concentration; Density H01M8/04492 takes precedence
• CPC Class Codes: H01M 8/04753 of fuel cell reactants
• CPC Class Codes: H01M 8/0494 of fuel cell stacks
• CPC Class Codes: H01M 8/04947 of auxiliary devices, e.g. batteries, capacitors
• CPC Class Codes: H01M 8/0656 by electrochemical means H01M8/065 takes precedence
• CPC Class Codes: H01M 8/186 by electrolytic decomposition of the electrolytic solution or the formed water product
• CPC Class Codes: H01M 8/249 comprising two or more groupings of fuel cells, e.g. modular assemblies
• CPC Class Codes: Y02E 60/10 Energy storage using batteries
• CPC Class Codes: Y02E 60/50 Fuel cells

Abstract

A modular, regenerative fuel cell system that includes a plurality of dedicated or reversible electrochemical cell stack modules, where each such module is devoid of major fluid systems, is provided. The inventive system allows a user to specifically and effectively tailor the system to the demands of a particular application. If additional electrolysis capability and/or additional power are needed, only electrolysis cell stack modules and/or fuel cell stack modules are added to the system. The use of unnecessary or duplicative support equipment is avoided thereby rendering this system more cost effective and efficient.

Claims

1. A modular, regenerative fuel cell system that comprises:

(a) one or more electrolysis cell fluid modules in fluid communication with (i) a source of water, water vapor, or aqueous solution, (ii) one or more electrolysis cell stack modules, and (iii) means for storing hydrogen gas, and in electrical communication with a power source and control means, for providing water, water vapor, or an aqueous solution to the one or more electrolysis cell stack modules and for delivering hydrogen gas generated by the one or more electrolysis cell stack modules to the means for storing hydrogen gas;

(b) one or more electrolysis cell stack modules in fluid communication with at least one electrolysis cell fluid module, and in electrical communication with the power source and the control means, each being adapted to convert water, water vapor, or an aqueous solution into at least a hydrogen gas;

(c) one or more fuel cell fluid modules in fluid communication with (i) the means for storing hydrogen gas, (ii) a source of air or oxygen, and (iii) the one or more fuel cell stack modules, and in electrical communication with the power source and the control means, for providing hydrogen gas and air or oxygen to the one or more fuel cell stack modules;

(d) one or more fuel cell stack modules in fluid communication with at least one fuel cell fluid module, and in electrical communication with the power source, an external load or power grid, and the control means, and each being adapted to extract chemical energy from the hydrogen gas and air or oxygen and converting the extracted chemical energy into electrical power;

(e) a power source;

(f) control means; and

(g) means for storing hydrogen gas,

wherein each stack module is devoid of major fluid systems, and

wherein each fluid module comprises one or more pumps, valves, regulators, water/gas phase separation devices, and temperature, pressure and hydrogen sensors.

2. The modular, regenerative fuel cell system of claim 1, wherein the power source comprises one or more batteries.

3. The modular, regenerative fuel cell system of claim 1, wherein the power source comprises means for (i) receiving power from an energy source, (ii) providing power to the one or more electrolysis cell fluid modules, the one or more electrolysis cell stack modules, and the one or more fuel cell fluid modules, and (iii) converting variable power from the one or more fuel cell stack modules to constant or relatively constant voltages and/or inverting direct currents to alternating currents.

4. The modular, regenerative fuel cell system of claim 1, wherein the power source comprises:

one or more batteries; and

means for (i) receiving power from an energy source, (ii) optionally, charging the one or more batteries, (iii) providing power to the one or more electrolysis cell fluid modules, the one or more electrolysis cell stack modules, and the one or more fuel cell fluid modules, and (iv) converting variable power from the one or more fuel cell stack modules to constant or relatively constant voltages and/or inverting direct currents to alternating currents.

5. The modular, regenerative fuel cell system of claim 1, which further comprises:

monitoring means for monitoring information regarding all aspects of the modular regenerative fuel cell system and for communicating the information to the control means.

6. The modular, regenerative fuel cell system of claim 1, wherein the system is selected. from the group of modular, regenerative Proton Exchange membrane fuel cell systems, modular, regenerative Solid Oxide fuel cell systems, modular regenerative Alkaline fuel cell systems, modular regenerative Phosphoric Acid fuel cell systems, modular hydrogen-halogen fuel cell systems, and combinations thereof.

7. A modular, regenerative fuel cell system that comprises one or more of each of the following functional modules:

electrolysis cell stack modules;

electrolysis cell fluid modules;

fuel cell stack modules; and

fuel cell fluid modules, and means for storing hydrogen gas,

wherein each stack module is devoid of major fluid systems, and

wherein each fluid module comprises one or more pumps, valves, regulators, water/gas phase separation devices, and temperature, pressure and hydrogen sensors.

8. The modular, regenerative fuel cell system of claim 7, that comprises:

(a) electrolysis cell stack modules, each module consisting essentially of one or more electrolysis cell stacks in fluid communication with an electrolysis cell fluid module, and in electrical communication with power means and control means, each being adapted to convert water or an aqueous solution into at least a hydrogen gas;

(b) a hydrogen gas storage tank;

(c) an electrolysis cell fluid module in fluid communication with (i) a source of water, water vapor, or aqueous solution, (ii) the electrolysis cell stack modules, and (iii) the hydrogen gas storage tank, and in electrical communication with the power means and the control means, for providing water, water vapor, or an aqueous solution to the electrolysis cell stack modules and for delivering hydrogen gas generated by the electrolysis cell stack modules to the hydrogen gas storage tank;

(d) fuel cell stack modules, each module consisting essentially of one or more fuel cell stacks in fluid communication with a fuel cell fluid module, and in electrical communication with the power means, an external load or power grid, and the control means, each being adapted to extract chemical energy from hydrogen gas and air or oxygen and converting the extracted chemical energy into electrical power;

(e) a fuel cell fluid module in fluid communication with (i) the hydrogen gas storage tank, (ii) a source of air or oxygen, and (iii) the fuel cell stack modules, and in electrical communication with power means and the control means, for providing hydrogen gas and air or oxygen to the fuel cell stack modules;

(f) one or more batteries;

(g) power means for (i) receiving power from an energy source, (ii) optionally, charging the one or more batteries, (iii) providing power to the electrolysis cell fluid module, the electrolysis cell stack modules, and the fuel cell fluid module, and (iv) converting variable power from the fuel cell stack modules to constant or relatively constant voltages and/or for inverting direct currents to alternating currents;

(h) monitoring means for monitoring information regarding all aspects of the modular regenerative fuel cell system and for communicating the information to the control means; and

(i) control means for receiving information from the monitoring means and for controlling all aspects of the modular regenerative fuel cell system, thereby assuring continuous, uninterrupted system operation.

9. The modular, regenerative fuel cell system of claim 8, wherein the cell stack modules contain membrane electrolysis cells and membrane fuel cells that each comprise an anode, a cathode, an ion exchange membrane disposed between the anode and the cathode, an anode chamberand a cathode chamber.

10. The modular, regenerative fuel cell system of claim 8, wherein the electrolysis cell stack modules are self-pressurizing electrolysis cell stack modules.

11. The modular, regenerative fuel cell system of claim 8, wherein the power means comprises a charge controller with optional maximum power point tracker and/or inverting capability.

12. The modular, regenerative fuel cell system of claim 8, wherein the power means comprises an inverter with optional charging capability.

13. The modular, regenerative fuel cell system of claim 12, wherein the power means comprises a direct current to alternating current inverter/charger.

14. The modular, regenerative fuel cell system of claim 8, wherein the monitoring means comprises monitoring instrumentation, and a communication system.

15. The modular, regenerative fuel cell system of claim 14, wherein the communication system is a high-speed local area network or LAN, and wherein the modular, regenerative fuel cell system interfaces with the LAN network through a wired or wireless LAN interface.

16. The modular, regenerative fuel cell system of claim 14, wherein the communication system comprises Radio Frequency Identification tags.

17. The modular, regenerative fuel cell system of claim 8, wherein the modules are. wall-mounted modules.

18. A method for identifying components of the modular, regenerative fuel cell system of claim 7, the method comprising applying or incorporating an RFID tag to or into one or more components of the modular, regenerative fuel cell system, and arranging for each RFID tag to communicate particular attributes of a component to a system controller.