Abstract: In a fuel cell stack constituting a fuel cell module, electrolyte/electrode assemblies and separators are alternately laminated. An electrolyte/electrode assembly and a terminal separator are arranged on one end of the fuel cell stack in the lamination direction in this order outwardly, and a dummy electrolyte/electrode assembly and a terminal separator are arranged on the other end of the fuel cell stack in the lamination direction in this order outwardly. The dummy electrolyte/electrode assembly is so formed as to have the same shape as the electrolyte/electrode assemblies, while having conductivity but not having a power generation function.

Abstract: A fuel cell separator has a sandwiching section. The sandwiching section is connected to a fuel gas manifold through a bridge, and connected to an oxygen-containing gas manifold through a bridge. The circumferential length R of the sandwiching section, the width H of the bridges the length L of the bridges, and the outer diameter D of the manifolds satisfies relationships of 0.03?H/R?0.20, 0.01?L/R?0.55, and 0.06?D/R?0.32.

Abstract: In a fuel cell stack constituting a fuel cell module, electrolyte/electrode assemblies and separators are alternately laminated. An electrolyte/electrode assembly and a terminal separator are arranged on one end of the fuel cell stack in the lamination direction in this order outwardly, and a dummy electrolyte/electrode assembly and a terminal separator are arranged on the other end of the fuel cell stack in the lamination direction in this order outwardly. The dummy electrolyte/electrode assembly is so formed as to have the same shape as the electrolyte/electrode assemblies, while having conductivity but not having a power generation function.

Abstract: A fuel cell separator has a sandwiching section. The sandwiching section is connected to a fuel gas manifold through a bridge, and connected to an oxygen-containing gas manifold through a bridge. The circumferential length R of the sandwiching section, the width H of the bridges, the length L of the bridges, and the outer diameter D of the manifolds satisfies relationships of 0.03?H/R?0.20, 0.01?L/R?0.55, and 0.06?D/R?0.32.

Abstract: A fuel cell includes electrolyte electrode assemblies and a pair of separators sandwiching the electrolyte electrode assemblies. The separator includes a plurality of circular disks, and a plurality of protrusions forming a fuel gas channel for supplying a fuel gas along an electrode surface of an anode are provided on a surface of each of the circular disks. Further, a deformable electrically conductive mesh member is provided on a surface of the circular disk. The deformable elastically conductive mesh member forms an oxygen-containing gas channel for supplying an oxygen-containing gas along a cathode, and tightly contacts the cathode.