In a manufacturing method for fuel cell separators having a seal part of convex shape that is pushed when superimposed with another separator, the method includes: a first pressing step of imparting work hardening to an entire region to become a convex shape configuring the seal part; and a second pressing step of press molding the region work hardened in the first pressing step so as to become a convex shape.

A fuel cell stack includes an insulating collar member provided in an end plate and screwed with a positioning pin, and a rotation restriction mechanism that restricts rotation of the collar member relative to the end plate in a screw tightening direction of the positioning pin. A method of assembling the fuel cell stack includes a screwing step and a stacking step. In the screwing step, rotation of the collar member relative to the end plate in the screw tightening direction of the positioning pin is restricted by the rotation restriction mechanism.

A fuel cell stack includes an insulating collar member provided in an end plate and screwed with a positioning pin, and a rotation restriction mechanism that restricts rotation of the collar member relative to the end plate in a screw tightening direction of the positioning pin. A method of assembling the fuel cell stack includes a screwing step and a stacking step. In the screwing step, rotation of the collar member relative to the end plate in the screw tightening direction of the positioning pin is restricted by the rotation restriction mechanism.

A cell stack device includes a fuel cell, a first separator and a first bonding member. The fuel cell includes a solid electrolyte and a cathode that is provided on one surface of the solid electrolyte. The first separator includes a protrusion that protrudes towards the cathode. The first bonding member bonds the cathode and the first protrusion. The thickness of a first bonding member that is positioned on an outer peripheral portion is greater than the thickness of a first bonding member that is positioned at a central portion.

A cell stack device includes a fuel cell, a first separator and a first bonding member. The fuel cell includes a solid electrolyte and a cathode that is provided on one surface of the solid electrolyte. The first separator includes a protrusion that protrudes towards the cathode. The first bonding member bonds the cathode and the first protrusion. The thickness of a first bonding member that is positioned on an outer peripheral portion is greater than the thickness of a first bonding member that is positioned at a central portion.

A Solid Oxide Cell stack has an integrated interconnect and spacer, which is formed by bending a surplus part of the plate interconnect 180° to form a spacer part on top of the interconnect and connected to the interconnect at least by the bend.

Each of separator members of a fuel cell stack includes a cell voltage terminal protruding outward from an outer peripheral portion of a separator body. Each of the cell voltage terminals includes a plate shaped terminal, first protrusions, and second protrusions. At least some of the cell voltage terminals are arranged in a line in a stacking direction. In the cell voltage terminals facing each other in the stacking direction, the first protrusion of one of the cell voltage terminals and the second protrusion of the other of the cell voltage terminals face each other, and contact each other through an electrically insulating member.

Each of separator members of a fuel cell stack includes a cell voltage terminal protruding outward from an outer peripheral portion of a separator body. Each of the cell voltage terminals includes a plate shaped terminal, first protrusions, and second protrusions. At least some of the cell voltage terminals are arranged in a line in a stacking direction. In the cell voltage terminals facing each other in the stacking direction, the first protrusion of one of the cell voltage terminals and the second protrusion of the other of the cell voltage terminals face each other, and contact each other through an electrically insulating member.

A multiple perforation plate for a separator of a fuel cell is provided. The multiple perforation plate is disposed between the separator having a flat plate shape and a gas diffusion layer to form flow paths for a reaction gas, and the multiple perforation plate includes a porous hole region having an uneven shape repeatedly formed therein and provided with a plurality of flow path holes configured to allow the reaction gas to flow in a turbulent way, and a channel region forming a flow path configured to allow the reaction gas to flow along a flow direction of the reaction gas in a straight way, wherein the porous hole region and the channel region are alternately disposed and integrally formed.

A method for producing a bipolar plate for a fuel cell having a membrane electrode assembly comprises providing a first fuel cell half-plate, which has a circumferential plate edge which has a first media channel offset inwardly from the plate edge and also a first flow field, providing a second fuel cell half-plate, which has a plate edge corresponding to the plate edge of the first fuel cell half-plate, and which has a second media channel offset inwardly from its plate edge and also a second flow field, the second media channel being aligned with the first media channel when the two fuel cell half-plates are stacked one above the other in perfect alignment, and joining the first fuel cell half-plate to the second fuel cell half-plate along a media-channel joint line framing the media channels, wherein a joint-line-free sealing region of the fuel cell half-plates borders the plate edges, on which a seal is fixed or is to be fixed, and the first fuel cell half-plate is joined to the second fuel cell half-plate along an additional frame joint line adjoining the media channel joint line or overlapping same, at least some sections of said additional frame joint line being offset along the plate edges in relation to the sealing region.