Bipolar plate and fuel cell including the same
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
H01M-008/02
H01M-008/04
H01M-008/10
출원번호
US-0772452
(2004-02-06)
등록번호
US-7335438
(2008-02-26)
우선권정보
KR-10-2003-0018502(2003-03-25)
발명자
/ 주소
Lee,Seung jae
Choi,Kyoung Hwan
Chang,Hyuk
출원인 / 주소
Samsung Electronics Co., Ltd.
대리인 / 주소
Buchanan Ingersoll & Rooney PC
인용정보
피인용 횟수 :
1인용 특허 :
4
초록▼
A bipolar plate and a fuel cell using the same are provided. The bipolar plate includes a flow field that has a length between three and eight times greater than the square of the area of the bipolar plate. The fuel cell includes a first bipolar plate in which a fuel flow field having a length tha
A bipolar plate and a fuel cell using the same are provided. The bipolar plate includes a flow field that has a length between three and eight times greater than the square of the area of the bipolar plate. The fuel cell includes a first bipolar plate in which a fuel flow field having a length that is between three and eight times greater than the square of the area of the first bipolar plate is formed, and a second bipolar plate in which an air flow field having a length that is between three and eight times greater than the spare of the area of the second bipolar plate is formed. The fuel cell has a lower, uniform internal pressure and can produce a greater power.
대표청구항▼
What is claimed is: 1. A bipolar plate for a fuel cell, the bipolar plate including a flow field through which one of a fuel and an oxidant is allowed to flow, wherein the flow field has a length from inlet to outlet that is between three and eight times greater than the square root of the area of
What is claimed is: 1. A bipolar plate for a fuel cell, the bipolar plate including a flow field through which one of a fuel and an oxidant is allowed to flow, wherein the flow field has a length from inlet to outlet that is between three and eight times greater than the square root of the area of the bipolar plate. 2. The bipolar plate of claim 1, wherein the flow field is formed in a reaction plate that protrudes above a surface of the bipolar plate with a predetermined gap from the edge of the bipolar plate. 3. The bipolar plate of claim 1, wherein the flow field is formed in a reaction plate that is recessed from a surface of the bipolar plate with a predetermined gap from the edge of the bipolar plate. 4. The bipolar plate of claim 1, wherein the flow field comprises channels through which the fuel or the oxidant flows and a rib acting as a barrier between the channels, and the channels have a width that is between 1.3 and 2 times greater than the width of the rib. 5. The bipolar plate of claim 4, wherein each of the channels has a length that is between three and eight times longer than the square root of the area of the bipolar plate. 6. The bipolar plate of claim 1, wherein the flow field includes no more than sixty 90-degree turns. 7. The bipolar plate of claim 1, wherein the flow field includes no more than twelve 180-degree turns. 8. The bipolar plate of claim 6, wherein the 90-degree turns are rounded. 9. The bipolar plate of claim 7, wherein the 180-degree turns are rounded. 10. The bipolar plate of claim 1, wherein the fuel flow field has four sides on the perimeter of the fuel flow field, wherein an inlet is located on a first side of the fuel flow field and faces a first direction and an outlet also located on the first side of the fuel flow field and also faces the first direction such that the inlet and the outlet are arranged on the same side and face the same direction. 11. The bipolar plate of claim 10, wherein the flow field has an inlet and an outlet that are elliptical. 12. The bipolar plate of claim 4, wherein the flow field has an inlet and an outlet that are fan-shaped and have a width increasing away from the channels. 13. The bipolar plate of claim 4, wherein the flow field has an inlet and an outlet that have a 30-50% greater depth than the channels. 14. The bipolar plate of claim 1, further comprising a thermoelement inlet in an edge region. 15. A fuel cell comprising: a first bipolar plate having a fuel flow field; a second bipolar plate having an air flow field; and a membrane electrode assembly interposed between the first and second bipolar plates and in which reactions of a fuel and an oxidant take place, wherein the fuel flow field has a length from inlet to outlet that is between three and eight times greater than the square root of the area of the first bipolar plate, and the air flow field has a length that is between three and eight times greater than the square root of the area of the second bipolar plate. 16. A fuel cell comprising: a first bipolar plate having a fuel flow field wherein the fuel flow field is formed in a reaction plate that protrudes above a surface of the first bipolar plate with a predetermined gap from the edge of the first bipolar plate; a second bipolar plate having an air flow field; and a membrane electrode assembly interposed between the first and second bipolar plates and in which reactions of a fuel and an oxidant take place, wherein the fuel flow field has a length from inlet to outlet that is between three and eight times greater than the square root of the area of the first bipolar plate, and the air flow field has a length from inlet to outlet that is between three and eight times greater than the square root of the area of the second bipolar plate. 17. A fuel cell comprising: a first bipolar plate having a fuel flow field; a second bipolar plate having an air flow field; and a membrane electrode assembly interposed between the first and second bipolar plates and in which reactions of a fuel and an oxidant take place, wherein the fuel flow field has a length from inlet to outlet that is between three and eight times greater than the sguare root of the area of the first bipolar plate, and the air flow field has a length from inlet to outlet that is between three and eight times greater than the sguare root of the area of the second bipolar plate, and wherein the flow field is formed in a reaction plate that is recessed from a surface of the first bipolar plate with a predetermined gap from the edge of the first bipolar plate. 18. The fuel cell of claim 15, wherein the air flow field is formed in a reaction plate that protrudes above a surface of the second bipolar plate with a predetermined gap from the edge of the second bipolar plate. 19. The fuel cell of claim 15, wherein the air flow field is formed in a reaction plate that is recessed from a surface of the second bipolar plate with a predetermined gap from the edge of the second bipolar plate. 20. The fuel cell of claim 16, wherein the fuel flow field comprises channels through which the fuel flows and a rib acting as a barrier between the channels, and the channels have a width that is between 1.3 and 2 times greater than the width of the rib. 21. The fuel cell of claim 18, wherein the air flow field comprises channels through which the fuel flows and a rib acting as a barrier between the channels, and the channels have a width that is between 1.3 and 2 times greater than the width of the rib. 22. The fuel cell of claim 19, wherein the air flow field comprises channels through which the fuel flows and a rib acting as a barrier between the channels, and the channels have a width that is between 1.3 and 2 times greater than the width of the rib. 23. The fuel cell of claim 16, wherein the fuel flow field includes no more than sixty 90-degree turns. 24. The fuel cell of claim 16, wherein the fuel flow field includes no more than twelve 180-degree turns. 25. The fuel cell of claim 15, wherein the air flow field includes no more than fifty 90-degree turns. 26. The fuel cell of claim 15, wherein the air flow field includes no more than ten 180-degree turns. 27. The fuel cell of claim 23, wherein the 90-degree turns are rounded. 28. The fuel cell of claim 25, wherein the 180-degree turns are rounded. 29. The fuel cell of claim 24, wherein the 180-degree turns are rounded. 30. The fuel cell of claim 16, wherein the fuel flow field has four sides on the perimeter of the fuel flow field, wherein an inlet is located on a first side of the fuel flow field and faces a first direction and an outlet also located on the first side of the fuel flow field and also faces the first direction such that the inlet and the outlet are arranged on the same side and face the same direction. 31. The fuel cell of claim 15, wherein the air flow field has four sides on the perimeter of the air flow field, wherein an inlet is located on a first side of the air flow field and faces a first direction and an outlet also located on the first side of the air flow field and also faces the first direction such that the inlet and the outlet are arranged on the same side and face the same direction. 32. The fuel cell of claim 15, wherein an inlet of the fuel flow field is separated from an inlet of the air flow field, with an outlet of the fuel flow field or an outlet of the air flow field therebetween. 33. The fuel cell of claim 15, wherein an outlet of the fuel flow field is separated from an outlet of the air flow field, with an inlet of the fuel flow field or an inlet of the air flow field therebetween. 34. The fuel cell of claim 16, wherein the fuel flow field has an inlet and an outlet that are elliptical. 35. The fuel cell of claim 15, wherein the air flow field has an inlet and an outlet that are elliptical. 36. The fuel cell of claim 20, wherein the fuel flow field has an inlet and an outlet that fan-shaped and have a width increasing away from the channels. 37. The fuel cell of claim 21, wherein the air flow field has an inlet and an outlet that fan-shaped and have a width increasing away from the channels. 38. The fuel cell of claim 20, wherein the fuel flow field has an inlet and an outlet that have a 30-50% greater depth than the channels. 39. The fuel cell of claim 21, wherein the air flow field has an inlet and an outlet that have a 30-50% greater depth than the channels. 40. The fuel cell of claim 15, whereln the first bipolar plate comprises a thermoelement inlet in an edge region. 41. The fuel cell of claim 15, wherein the second bipolar plate comprises a thermoelement inlet in an edge region. 42. The fuel cell of claim 15, wherein the first bipolar plate is an anode, and the second bipolar plate is a cathode. 43. The fuel cell of claim 15, wherein the internal pressure of the first bipolar plate is in the range of 0.05-0.12 bar. 44. The fuel cell of claim 15, wherein the internal pressure of the second bipolar plate is in the range of 0.02-0.08 bar. 45. The fuel cell of claim 20, wherein each of the channels has a length from inlet to outlet that is between three and eight times longer than the square root of the area of the first bipolar plate, wherein the fuel flow field includes no more than sixty 90-degree turns. 46. The fuel cell of claim 21, wherein each of the channels has a length from inlet to outlet that is between three and eight times longer than the square root of the area of the second bipolar plate, wherein the fuel flow field includes no more than twelve 180-degree turns.
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이 특허에 인용된 특허 (4)
Pratt Steven D. ; Muthuswamy Sivakumar ; Kelley Ronald J. ; Davis James Lynn, Fuel cell.
Wilkinson David P. (North Vancouver CAX) Lamont Gordon J. (Vancouver CAX) Voss Henry H. (West Vancouver CAX) Schwab Clemens (Friedrichshafen DEX), Method of fabricating an embossed fluid flow field plate.
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