A fuel cell includes electrolyte electrode assemblies and a pair of separators sandwiching the electrolyte electrode assemblies. Each of the separators includes a plurality of circular disks. First protrusions and second protrusions are provided on both surfaces of the circular disk. The first protr
A fuel cell includes electrolyte electrode assemblies and a pair of separators sandwiching the electrolyte electrode assemblies. Each of the separators includes a plurality of circular disks. First protrusions and second protrusions are provided on both surfaces of the circular disk. The first protrusions contact an anode of the electrolyte electrode assembly, and the second protrusions contact a cathode of the electrolyte electrode assembly. The area of the separators is divided into portions corresponding to the respective electrolyte electrode assemblies. Each of the divided portions of the separators forms a fuel gas flow field and an oxygen-containing gas flow field by sandwiching the electrolyte electrode assembly.
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What is claimed is: 1. A fuel cell including a plurality of electrolyte electrode assemblies and separators sandwiching said electrolyte electrode assemblies, said electrolyte electrode assemblies each including an anode, a cathode, and an electrolyte interposed between said anode and said cathode,
What is claimed is: 1. A fuel cell including a plurality of electrolyte electrode assemblies and separators sandwiching said electrolyte electrode assemblies, said electrolyte electrode assemblies each including an anode, a cathode, and an electrolyte interposed between said anode and said cathode, wherein each of said separators comprises: a plurality of sandwiching portions for sandwiching said electrolyte electrode assemblies and forming a plurality of fuel gas flow fields between one surface of said separator and respective anodes of said electrolyte electrode assemblies for supplying a fuel gas to said anodes and a plurality of oxygen-containing gas flow fields between the other surface of said separator and respective cathodes of said electrolyte electrode assemblies for supplying an oxygen-containing gas to said cathodes; a fuel gas supply unit formed at a central region of the separators and extending in a stacking direction of said separators for supplying unreacted fuel gas; a plurality of fuel gas supply channels diverged from said fuel gas supply unit, connected to said sandwiching portions, and communicated with said fuel gas flow fields, and wherein said fuel cell comprises a tightening load applying mechanism, and a load applied in the stacking direction to a position near said fuel gas supply unit by said tightening load applying mechanism is larger than a load applied in the stacking direction to said sandwiching portions by said tightening load applying mechanism. 2. A fuel cell according to claim 1, further comprising an exhaust gas channel for discharging a fuel gas and an oxygen-containing gas consumed in reaction in said electrolyte electrode assembly as an exhaust gas into the stacking direction of said electrolyte electrode assembly and said separators; and said fuel gas supply channels extend along a surface of said separator which intersects said exhaust gas channel extending in the stacking direction. 3. A fuel cell according to claim 1, wherein said separator comprises a single plate. 4. A fuel cell according to claim 1, wherein first protrusions are provided on one surface of said separator and second protrusions are provided on the other surface of said separator; and said fuel gas flow field is formed between said first protrusions and said separator, and said oxygen-containing gas flow field is formed between said second protrusions and said separator. 5. A fuel cell according to claim 4, wherein one of said first and second protrusions is an annular protrusion and the other of said first and second protrusions is a mountain shaped protrusion. 6. A fuel cell according to claim 5, wherein said mountain shaped protrusion is disposed in a recess formed by said annular protrusion. 7. A fuel cell according to claim 6, wherein said mountain shaped protrusion and said annular protrusion are coaxial with each other. 8. A fuel cell according to claim 6, wherein said recess has a perfectly circular shape. 9. A fuel cell according to claim 6, wherein said recess has an oval shape. 10. A fuel cell according to claim 5, wherein the vertical cross section of said mountain shaped protrusion has a trapezoidal shape. 11. A fuel cell stack formed by stacking a plurality of fuel cells in a stacking direction, said fuel cells each including electrolyte electrode assemblies and a pair of separators sandwiching said electrolyte electrode assemblies, said electrolyte electrode assemblies each including an anode, a cathode, and an electrolyte interposed between said anode and said cathode, wherein adjacent electrolyte electrode assemblies of said fuel cell are separately sandwiched between said separators; said fuel cell stack further comprises a tightening load applying mechanism for applying a tightening load to said fuel cells in the stacking direction; a fuel gas supply unit is formed at a central region of said fuel cells, and said electrolyte electrode assemblies are provided in an outer region of said fuel cells; and a load applied to said central region of said fuel cells in the stacking direction by said tightening load applying mechanism is larger than a load applied to said outer region of said fuel cells in the stacking direction by said tightening load applying mechanism, and the load applied to said outer region of said fuel cells in the stacking direction is determined separately for each of said electrolyte electrode assemblies. 12. A fuel cell stack according to claim 11, wherein first protrusions are provided on one surface of said separator and second protrusions are provided on the other surface of said separator; and said fuel gas flow field is formed between said first protrusions and said separator, and said oxygen-containing gas flow field is formed between said second protrusions and said separator. 13. A fuel cell stack according to claim 12, wherein one of said first and second protrusions is an annular protrusion and the other of said first and second protrusions is a mountain shaped protrusion. 14. A fuel cell stack according to claim 13, wherein said mountain shaped protrusion is disposed in a recess formed by said annular protrusion. 15. A fuel cell stack according to claim 14, wherein said mountain shaped protrusion and said annular protrusion are coaxial with each other. 16. A fuel cell stack according to claim 14, wherein said recess has a perfectly circular shape. 17. A fuel cell stack according to claim 14, wherein said recess has an oval shape. 18. A fuel cell stack according to claim 13, wherein the vertical cross section of said mountain shaped protrusion has a trapezoidal shape.
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이 특허에 인용된 특허 (3)
Chen Tan-Ping, Fuel cell stack system and operating method.
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