Fuel cell system

• US 5,139,894 A
• Filed: 05/02/1990
• Issued: 08/18/1992
• Est. Priority Date: 05/02/1989
• Status: Expired due to Fees

• Current Assignee: Yamaha Hatsudoki Kabushiki Kaisha (Yamaha Corporation)
• Original Assignee: Yamaha Hatsudoki Kabushiki Kaisha (Yamaha Corporation)
• Inventors: Mizuno, Yutaka, Hanajima, Toshiharu, Matsubara, Hisayoshi
• Primary Examiner(s): KALAFUT, STEPHEN J
• Application Number:
  US07/517,871
• Time in Patent Office: 839 Days
• Field of Search: 429/9, 429/19, 429/21
• US Class Current: 429/9
• CPC Class Codes: H01M 16/006 of fuel cells with rechargeable batteries
• CPC Class Codes: H01M 50/609 Arrangements or processes for filling with liquid, e.g. electrolytes
• CPC Class Codes: H01M 50/673 Containers for storing liquids; Delivery conduits therefor
• CPC Class Codes: H01M 8/04156 with product water removal
• CPC Class Codes: H01M 8/0612 from carbon-containing material
• CPC Class Codes: Y02E 60/10 Energy storage using batteries
• CPC Class Codes: Y02E 60/50 Fuel cells

Abstract

A number of embodiments of fuel cells including a storage battery which can intermittently supply electrical power to a load. In such embodiment, water vapor generated from the operation of the fuel cell is condensed, purified and returned to the storage battery to replace the water consumed from the electrolyte from the battery operation. The water vapor is reclaimed by a series of condensers and is returned to a purifier. In some embodiments the reclaimed water vapor is delivered to the battery by an intermittently operated pump while in other embodiments the water vapor is returned by a continuously operated pump through some form of overflow device to ensure against dilution of the electrolyte in the battery.

Claims

1. A fuel cell system for providing electrical power to a load comprising a fuel cell system for generating electrical power from a chemical reaction, a reformer for reforming fuel supplied to a fuel cell of said fuel cell system, said reformer discharging a waste product including water vapor in its operation, an electrical storage battery containing an electrolyte including water, said fuel cell system and said electrical storage battery both being in circuit with said load for supplying electrical power for said load, means for condensing said water vapor, and means for supplying the condensed water from the vapor to said storage battery to replace the water in its electrolyte consumed by its operation.

2. A fuel cell system for providing electrical power as set for in claim 1, wherein water is also reclaimed from the water vapor in the exhaust from the fuel cell system.

3. A fuel cell system for providing electrical power as set forth in claim 1, wherein the water vapor is recovered from the exhaust of the reformer.

4. A fuel cell system for providing electrical power as set forth in claim 3, wherein the water is also reclaimed from the water vapor contained within the reformed fuel.

5. A fuel cell system for providing electrical power as set forth in claim 1, wherein the reclaimed water is passed through a water purifier before being delivered to the electrical storage battery.

6. A fuel cell system for providing electrical power as set forth in claim 1, wherein the reclaimed water is supplied to the storage battery in response to the change of level of electrolyte in the battery.

7. A fuel cell system for providing electrical power as set forth in claim 6, wherein the reclaimed water is delivered to the storage battery by an intermittently operated pump.

8. A fuel cell system for providing electrical power as set forth in claim 6, wherein the reclaimed water is delivered back to the storage battery through a system having an overflow so that the reclaimed water is continuously returned.

9. A fuel cell system for providing electrical power as set forth in claim 8, wherein the reclaimed water is delivered to a storage tank that communicates with the storage battery through a siphon and which has an overflow.

10. A fuel cell system as set forth in claim 1, wherein the fuel cell is powered by a chemical reaction generated independently of the storage battery.

11. A fuel cell system for providing electrical power as set forth in claim 10, wherein water is also reclaimed from the water vapor in the exhaust from the fuel cell system.

12. A fuel cell system for providing electrical power as set forth in claim 10, wherein the water vapor is recovered from the exhaust of the reformer.

13. A fuel cell system for providing electrical power as set forth in claim 12, wherein the water is also reclaimed from the water vapor contained within the reformed fuel.

14. A fuel cell system for providing electrical power as set forth in claim 10, wherein the reclaimed water is passed through a water purifier before being delivered to the electrical storage battery.

15. A fuel cell system for providing electrical power as set forth in claim 10, wherein the reclaimed water is supplied to the storage battery in response to the change of level of electrolyte in the battery.

16. A fuel cell system for providing electrical power as set forth in claim 15, wherein the reclaimed water is delivered to the storage battery by an intermittently operated pump.

17. A fuel cell system for providing electrical power as set forth in claim 15, wherein the reclaimed water is delivered back to the storage battery through a system having an overflow so that the reclaimed water is continuously returned.

18. A fuel cell system for providing electrical power as set forth in claim 17, wherein the reclaimed water is delivered to a storage tank that communicates with the storage battery through a siphon and which has an overflow.