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A fuel cell includes an electrolyte layer in form of a plate, an oxygen electrode formed on one surface of the electrolyte layer, a fuel electrode formed on the other surface of the electrolyte layer, and a conductive separator opposed to the oxygen electrode or fuel electrode for defining oxygen-co

A fuel cell includes an electrolyte layer in form of a plate, an oxygen electrode formed on one surface of the electrolyte layer, a fuel electrode formed on the other surface of the electrolyte layer, and a conductive separator opposed to the oxygen electrode or fuel electrode for defining oxygen-containing gas passages or fuel gas passages. The separator includes a plate-like portion opposed to and spaced from the oxygen electrode or fuel electrode, a pair of strip-shaped projections extending along opposite ends of the plate-like portion for contacting opposite edges of the electrolyte layer, and a plurality of ridges for defining gas passages in form of grooves between the pair of strip-shaped projections. A fuel cell system includes a plurality of such fuel cells stacked one over another in a spaced relationship to define fuel gas passages or oxygen-containing gas passages in between. A flexible conductive element is disposed between an adjacent pair of the fuel cells.

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A fuel cell comprising: an electrolyte layer in form of a square plate, said electrolyte layer including a pair of exposing portions formed along opposite edges of said electrolyte layer; an oxygen electrode formed on one side of said electrolyte layer; a fuel electrode formed on the other side of s

A fuel cell comprising: an electrolyte layer in form of a square plate, said electrolyte layer including a pair of exposing portions formed along opposite edges of said electrolyte layer; an oxygen electrode formed on one side of said electrolyte layer; a fuel electrode formed on the other side of said electrolyte layer; gas passage defining means for defining oxygen-containing gas passages opposed to said oxygen electrode; said gas passage defining means includes a plate portion extending in parallel to said oxygen electrode, a pair of strip-shaped projections extending from a pair of opposite edges of said plate portion to be bonded to said exposing portions of said electrolyte layer, and a plurality of ridges for defining oxygen-containing gas passages in form of grooves between said pair of strip-shaped projections; and said pair of strip-shaped projections and said plurality of ridges are integrally formed with said plate portion.