Abstract: A fuel cell stack is prepared by laminating multiple fuel cells. Each fuel cell has a first separator, a first resin frame, a second resin frame, and a second separator arranged in this sequence. A membrane electrode assembly or MEA is held between the two resin frames. A layered structure of the two resin frames and seal layers forms an inter-separator inclusion. In the fuel cell, a barcode is provided on an exposed outer surface of the inter-separator inclusion, which has a greater thickness than those of the respective separators. This arrangement enables the barcode to be readily provided and scanned, regardless of the thicknesses and the materials of the respective separators.

Abstract: There is realized a structure particularly suitable for inhibiting deformation of separators having a structure where the shapes of projections and recesses are inverted from each other on the front side and the back side of each separator as in a pressed metal separator. Between adjacent separators, there is formed either a power generation region where MEAs and frame members for holding at least a part of the MEAs are inserted or a refrigerant flow region where neither the MEAs nor the frame members are inserted. A deformation inhibiting region for inhibiting deformation of each separator is formed by a projection provided on the separator. Also, a projection for inhibiting the separator from deforming at the deformation inhibiting region or nearby is formed on each frame member. The projection is projected toward the back side of the deformation inhibiting region, where the deformation inhibiting region is a recess on the back side of the separator.

Abstract: A fuel battery cell which includes a fuel cell separator having a reaction gas passage, an inlet side reaction gas manifold which is in communication with an inlet portion of the reaction gas passage, and an outlet side reaction gas manifold which is in communication with an outlet portion of the reaction gas passage, wherein at least one of lower surfaces of the inlet side reaction gas manifold and the outlet side reaction gas manifold is inclined toward the reaction gas passage.

Abstract: The fuel cell of the invention includes an electrolyte assembly, and a separator having one face as a gas flow path-forming face with a gas flow path formed thereon to allow flow of a reactive gas and the other face, which is reverse to the one face, as a refrigerant flow path-forming face with a refrigerant flow path formed thereon to allow flow of a refrigerant. The gas flow path-forming face of the separator has multiple linear gas flow paths that are arranged in parallel to one another, and a gas flow path connection structure that divides the multiple linear gas flow paths into plural linear gas flow path groups and connects at least part of the plural linear gas flow path groups in series.