Abstract: A fuel cell includes sensors. Each sensor includes: a sensor portion provided on at least one of separators, a frame member, and an electrolyte membrane; and a wiring portion connected to the sensor portion and extending to an outer peripheral portion of one of the separators or an outer peripheral portion of a membrane electrode assembly. The sensor further includes a base insulating film covering a sensor arrangement region; wiring patterns laminated on the base insulating film; and a covering insulating film covering the wiring patterns and portions of the base insulating film not covered with the wiring patterns.

Abstract: A fuel cell includes sensors. Each sensor includes: a sensor portion provided on at least one of separators, a frame member, and an electrolyte membrane; and a wiring portion connected to the sensor portion and extending to an outer peripheral portion of one of the separators or an outer peripheral portion of a membrane electrode assembly. The sensor further includes a base insulating film covering a sensor arrangement region; wiring patterns laminated on the base insulating film; and a covering insulating film covering the wiring patterns and portions of the base insulating film not covered with the wiring patterns.

Abstract: The fuel cell system determines whether or not condensation is occurring in the anode gas and the cathode gas on the basis of the humidity of the cathode gas detected by a first humidity sensor provided in the power generation cells and the humidity of the anode gas detected by a second humidity sensor provided in the power generation cells, and adjusts the water content in the cathode gas and/or the anode gas in which condensation is occurring.

Abstract: A fuel cell system includes a cathode system device, an anode system device, an ion detector, and a controller. When the concentration of fluoride ions exceeds a predetermined concentration threshold, the controller controls at least one of the cathode system device and the anode system device to adjust a load applied to the membrane electrode assemblies.

Abstract: A fuel cell includes sensors. Each sensor includes: a sensor portion provided on at least one of separators, a frame member, and an electrolyte membrane; and a wiring portion connected to the sensor portion and extending to an outer peripheral portion of one of the separators or an outer peripheral portion of a membrane electrode assembly. The sensor further includes a base insulating film covering a sensor arrangement region; wiring patterns laminated on the base insulating film; and a covering insulating film covering the wiring patterns and portions of the base insulating film not covered with the wiring patterns.

Abstract: A water detection device is provided for a power generation cell. The power generation cell has a reactant gas flow field (oxygen-containing gas flow field) configured to allow a reactant gas to flow along a membrane electrode assembly. The water detection device includes an electrically conductive member and a support member. The support member is an insulating member. The support member covers, and supports an electrically conductive member, and has an opening which exposes part of the electrically conductive member as an electrode. The opening is provided at a position facing a reactant gas flow field.

Abstract: A water detection device is provided for a power generation cell. The power generation cell has a reactant gas flow field (oxygen-containing gas flow field) configured to allow a reactant gas to flow along a membrane electrode assembly. The water detection device includes an electrically conductive member and a support member. The support member is an insulating member. The support member covers, and supports an electrically conductive member, and has an opening which exposes part of the electrically conductive member as an electrode. The opening is provided at a position facing a reactant gas flow field.

Abstract: A resin-framed stepped membrane electrode assembly for a fuel cell, includes a stepped membrane electrode assembly and a resin frame member. The resin frame member surrounds a membrane outer periphery end of a solid polymer electrolyte membrane and includes an inner protruding portion protruding from the membrane outer periphery end toward a second electrode and is joined to the stepped membrane electrode assembly with an adhesive. The inner protruding portion includes a bank portion, a groove portion, and a ledge portion. The roughness of the bank surface is smaller than a roughness of the groove surface.

Abstract: A fuel cell includes a membrane electrode assembly having a substantially rectangular shape having a first side and a second side opposite to the first side in a side direction. The substantially rectangular shape includes a first portion and a second portion. The first portion is closer to the first side than to the second side in the side direction. At least one of a cathode electrode and an anode electrode has a smaller amount of cracks in an electrode catalyst layer in the first portion than in the second portion. A fuel gas outlet manifold and an oxidant gas inlet manifold are closer to the first side than to the second side in the side direction. A fuel gas inlet manifold and an oxidant gas outlet manifold are closer to the second side than to the first side in the side direction.

Abstract: A fuel cell stack includes a plurality of power generation units, a reactant gas channel, and a coolant channel. The plurality of power generation units are stacked in a stacking direction to provide a stacked body and each includes a first separator, a first electrolyte electrode assembly, a second separator, a second electrolyte electrode assembly, and a third separator. The first electrolyte electrode assembly is provided on the first separator. The second separator is provided on the first electrolyte electrode assembly. The second electrolyte electrode assembly is provided on the second separator. The first electrolyte electrode assembly and the second electrolyte electrode assembly each include an electrolyte and a pair of electrodes sandwiching the electrolyte therebetween. The third separator is provided on the second electrolyte electrode assembly.

Abstract: In a fuel cell stack, voltage detecting terminals are disposed on a second separator and a third separator of a power generation unit, whereas a voltage detecting terminal is not disposed on a first separator of the power generation unit. Among terminal plates of the fuel cell stack, another voltage detecting terminal is disposed only on the terminal plate that is in contact with the first separator.

Abstract: A resin-framed stepped membrane electrode assembly for a fuel cell, includes a stepped membrane electrode assembly and a resin frame member. The resin frame member surrounds a membrane outer periphery end of a solid polymer electrolyte membrane and includes an inner protruding portion protruding from the membrane outer periphery end toward a second electrode and is joined to the stepped membrane electrode assembly with an adhesive. The inner protruding portion includes a bank portion, a groove portion, and a ledge portion. The roughness of the bank surface is smaller than a roughness of the groove surface.

Abstract: A fuel cell includes a membrane electrode assembly having a substantially rectangular shape having a first side and a second side opposite to the first side in a side direction. The substantially rectangular shape includes a first portion and a second portion. The first portion is closer to the first side than to the second side in the side direction. At least one of a cathode electrode and an anode electrode has a smaller amount of cracks in an electrode catalyst layer in the first portion than in the second portion. A fuel gas outlet manifold and an oxidant gas inlet manifold are closer to the first side than to the second side in the side direction. A fuel gas inlet manifold and an oxidant gas outlet manifold are closer to the second side than to the first side in the side direction.

Abstract: A fuel cell includes a cathode side separator. An oxygen-containing gas flow field is formed on a surface of the cathode side separator. The oxygen-containing gas flow field includes an inlet channel having a plurality of flow grooves connected to the oxygen-containing gas supply passage, an outlet channel having a plurality of flow grooves connected to the oxygen-containing gas discharge passage, and an intermediate channel having flow grooves with both ends connected to the inlet channel and the outlet channel respectively. The flow grooves of the outlet channel are longer than the flow grooves of the inlet channel, and the flow grooves of the outlet channel are narrowed toward the oxygen-containing gas discharge passage.

Abstract: A fuel cell stack includes a stacked body, a first terminal plate, a first insulator, a first end plate, a second terminal plate, a second insulator, a second end plate, a fluid manifold, a fluid channel, a fluid hole, a first connection passage, and a second connection passage. The stacked body includes a plurality of separators and a membrane electrode assembly. The plurality of separators and the membrane electrode assembly are stacked in a stacking direction. The membrane electrode assembly includes an electrolyte membrane and a pair of electrodes sandwiching the electrolyte membrane therebetween. The stacked body has a first end and a second end opposite to the first end in the stacking direction. The first terminal plate, the first insulator, and the first end plate are disposed at the first end of the stacked body.

Abstract: A fuel cell stack includes a stacked body which includes separators and a membrane electrode assembly. A first terminal plate, a first insulator, and a first end plate are disposed at a first end of the stacked body. A second terminal plate, a second insulator, and a second end plate are disposed at a second end of the stacked body. Each of the first terminal plate and the second terminal plate is provided in a first recessed portion formed in each of the first insulator and the second insulator. Each of the first and second insulators includes an outer peripheral part and a protrusion and recess portion in the outer peripheral part which is in contact with each of the separators that is disposed at the first and second ends. The protrusion and recess portion has a shape corresponding to a protrusion and recess shape of the separator.

Abstract: A fuel cell stack includes a terminal plate, an insulating member, and an end plate at one end of a stack body formed by stacking a plurality of power generation cells. A heat insulating member and the terminal plate are placed in a recess of the insulating member. The heat insulating member is formed by stacking metal plates and metal plates together alternately. The metal plate is formed by cutting the outer end of a first metal separator of the power generation cell into a frame shape and the metal plate is formed by cutting the outer end of a second metal separator of the power generation cell into a frame shape.

Abstract: A fuel cell stack includes a stacked body, a first terminal plate, a first insulating plate, a first end plate, and a first insulating collar member. The first insulating collar member includes a first tubular portion and a first flange portion. The first tubular portion is provided in the first fluid manifold hole. The first flange portion is disposed at one end of the first tubular portion. Another end of the first tubular portion projects to an outside of the first fluid manifold hole and is in slidably contact with an inner circumferential surface of the first outer manifold member via an outer circumferential surface sealing member. The first flange portion is in contact with the first insulating plate via an end-face sealing member.

Abstract: In a fuel cell stack, voltage detecting terminals are disposed on a second separator and a third separator of a power generation unit, whereas a voltage detecting terminal is not disposed on a first separator of the power generation unit. Among terminal plates of the fuel cell stack, another voltage detecting terminal is disposed only on the terminal plate that is in contact with the first separator.

Abstract: A fuel cell stack includes a stacked body, a first terminal plate, a first insulator, a first end plate, a second terminal plate, a second insulator, a second end plate, a fluid manifold, a fluid channel, a fluid hole, a first connection passage, and a second connection passage. The stacked body includes a plurality of separators and a membrane electrode assembly. The plurality of separators and the membrane electrode assembly are stacked in a stacking direction. The membrane electrode assembly includes an electrolyte membrane and a pair of electrodes sandwiching the electrolyte membrane therebetween. The stacked body has a first end and a second end opposite to the first end in the stacking direction. The first terminal plate, the first insulator, and the first end plate are disposed at the first end of the stacked body.