PLATE SOLID OXIDE FUEL CELL

For a plate solid oxide fuel cell, costs thereof are made low and the thermal conductivity thereof is improved, and further only by effect of the shape thereof, a burning gas is sealed while a back diffusion phenomenon of air from the outside is restrained. Plate-shaped unit cells 1 each composed of a plate-shaped solid electrolyte 2, and a fuel electrode 4 and an air electrode 3 arranged on both side surfaces thereof, respectively, are arranged to be alternated with metallic separators 10. A fuel supplying room S1 is formed between the fuel electrode 4 and one of the metallic separators 10; and an air supplying room S2 is formed between the air electrode 3 and one of the metallic separator 10. A peripheral edge 2a of the solid electrolyte 2 overhangs outwards from the fuel electrode 4 and the air electrode 3, and is sandwiched directly from both sides thereof between two metal plates 21 and 22. Peripheral edges of the two metal plates 21 and 22 overhang outwards from the solid electrolyte 2. A metallic spacer 23 surrounding the peripheral edge of the solid electrolyte 2 from the outside is sandwiched between the peripheral edges of the metal plates 21 and 22. A gap between the two metal plates 21 and 22 and both side surfaces of the peripheral edge 2a of the solid electrolyte 2 constitutes a maze for a fuel.