A fuel cell stack includes a first power output unit connected to a first terminal plate, the first power output unit including a first conductor, and a second conductor extending from the first conductor to the outside of an outer peripheral end of a first inner insulator in the state where the second conductor is placed between the first inner insulator and a first end plate. The second conductor is positioned inside of the first end plate in a stacking direction of a cell stack body.

A grid spring is provided with first raised pieces that generate an elastic force for pressing a separator toward a power generation cell and second raised pieces that generate an elastic force independently of the first raised pieces. The spring constant of the first raised pieces decreases as a result of heating of a grid spring. The grid spring functions as a high reaction force spring as a result of a larger spring constant of the first spring member relative to a spring constant of the second spring member before heating. After being heated, the grid spring functions as a low reaction force spring as a result of the smaller spring constant of the first spring member before being heated.

A solid oxide fuel cell or solid oxide electrolyzer includes a plurality of fuel cell layers stacked along a stacking axis. Each fuel cell layer including a stacked arrangement of elements including a cathode, an anode, an electrolyte located between the anode and the cathode, a support layer positioned at the anode opposite the electrolyte, and a separator plate located at the support layer opposite the anode. The separator plate is configured to contact the cathode of an adjacent fuel cell layer of the plurality of fuel cell layers. The separator plate defines a plurality of anode flow channels configured to deliver a fuel therethrough and a plurality of cathode flow channels configured to deliver an air flow therethrough. The separator plate is formed from a bulk metallic glass material.

A fuel cell includes a plurality of fuel cell layers stacked along a stacking axis. Each fuel cell layer includes a stacked arrangement of elements including a cathode, an anode, an electrolyte positioned between the anode and the cathode, a support layer positioned at the anode opposite the electrolyte, and a separator plate located at the support layer opposite the anode. The support layer is configured to contact the cathode of an adjacent fuel cell layer of the plurality of fuel cell layers. The separator plate defines a plurality of anode flow channels configured to deliver a fuel therethrough and a plurality of cathode flow channels configured to deliver an air flow therethrough.

A buffer layer between an interconnect and an electrolyte of a solid oxide fuel cell, the buffer layer having a gradient in coefficient of thermal expansion (CTE), wherein the buffer layer minimizes electrolyte damage due to a difference in CTE between the interconnect and electrolyte.

A fuel cell includes: a membrane electrode assembly of a flat plate shape including an electrolyte membrane and an electrode catalyst layer, the membrane electrode assembly having a first side intersecting a flow pathway of a reactive gas on a surface of the fuel cell and a second side differing from the first side; a frame member of a flat plate shape including an opening part for arrangement of the membrane electrode assembly, the opening part having a first frame side corresponding to the first side and a second frame side corresponding to the second side; and an adhesive member for bonding between an outer periphery of the membrane electrode assembly and an inner periphery of the frame member. The thickness of the adhesive member in an area from an inner peripheral edge at the second frame side toward a center of the frame member may be greater than the thickness of the adhesive member in an area from an inner peripheral edge at the first frame side toward the center of the frame member.

Bonding dies for producing a fuel cell that can suppress floating of a portion of a resin frame bonded to a membrane electrode assembly include first and second dies facing and contacting respective first and second separators. The first die includes a central receiving portion and an outer periphery receiving portion. The second die includes an inner die that pressurizes a central region of the second separator, and an outer die formed to surround the inner die to thermally compress a peripheral region of the second separator. The inner die extends from a portion corresponding to the central region along an open edge in the resin frame, up to a region closer to an outer periphery side of the electrode assembly than a portion of the resin frame bonded to the membrane electrode assembly, so as to pressurize the resin frame via the other separator.

Provided is a fuel cell including: a membrane electrode-gas diffusion layer assembly including an electrolyte membrane; a sheet member; and a pair of separators. A first separator has a first projection that protrudes toward a side opposite from where the electrolyte membrane is disposed. A second separator has a second projection that protrudes toward a side opposite from where the electrolyte membrane is disposed. When seen from a direction perpendicular to the electrolyte membrane, the first projection and the second projection overlap at least part of the electrolyte membrane; the first projection has a first overlapping portion and a first non-overlapping portion; the second projection has a second overlapping portion and a second non-overlapping portion; the first projection is shaped so as to extend in a first longitudinal direction; and the second projection is shaped so as to extend in a second longitudinal direction intersecting the first longitudinal direction.

An elastomeric cell frame forming a unit cell of a fuel cell stack may include an insert in which a membrane electrode assembly and a pair of gas diffusion layers are bonded to each other; and an elastomeric frame disposed to surround a periphery of side surfaces of the insert, in which the side surfaces of the insert are positioned between the upper and lower surfaces of the insert, one of upper and lower surfaces of the insert and side surfaces of the insert and bonded with the periphery of the surface of the insert and the side surfaces of the insert into an integrated structure by thermal bonding.

A fuel cell stack includes: a cell stacked body in which a plurality of fuel cells are stacked in multiple layers; and an end plate by which the plurality of fuel cells are fastened, the end plate including an open end plate disposed at one end of the cell stacked body and a closed end plate disposed at another end of the cell stacked body, wherein the open end plate includes a gas inlet delivering a reactant gas supplied from an outside of the fuel cell stack to the cell stacked body, a gas outlet discharging the reactant gas having passed through the cell stacked body to the outside of the fuel cell stack, and a bypass channel connecting the gas inlet to the gas outlet to guide condensed water introduced to the gas inlet to the gas outlet, the bypass channel partially curved to allow the condensed water to be collected.