A fuel cell stack includes a stack body of power generation cells stacked in a horizontal direction. An oxygen-containing gas flow field is formed in the fuel cell stack, for allowing an oxygen-containing gas to flow along an electrode surface of a membrane electrode assembly. A plurality of oxygen-containing gas discharge passages for discharging the oxygen-containing gas as a reactant gas pass through the fuel cell stack in a stacking direction of the power generation cells. Each of the oxygen-containing gas discharge passages is connected to an outlet. The plurality of oxygen-containing gas discharge passages are connected together by a first connection channel at an end opposite to the outlet.

A fuel cell stack according to the present disclosure includes a collector configured to collect electric power generated by a plurality of fuel battery cells. The collector includes a structure in which the separator and the collector plate adhere to each other with a seal member interposed therebetween. A space formed by the collector plate, the separator, and the seal member is a closed space. The collector includes a ventilation structure for discharging gas from the closed space to the outside when a pressure in the closed space rises.

A resin film equipped MEA of a power generation cell includes a membrane electrode assembly and a resin film. An inner peripheral end of a first frame shaped sheet of the resin film is positioned outside an outer peripheral end of a cathode, and faces the outer peripheral end of the cathode so as to be separated by a gap. An inner peripheral portion of a second frame shaped sheet is held between the anode and the cathode. A first metal separator facing the first frame shaped sheet is provided with protruding support structure configured to support an inner peripheral portion of the first frame shaped sheet and an outer peripheral portion of the cathode.

A resin film equipped MEA of a power generation cell includes a membrane electrode assembly and a resin film. An inner peripheral end of a first frame shaped sheet of the resin film is positioned outside an outer peripheral end of a cathode, and faces the outer peripheral end of the cathode so as to be separated by a gap. An inner peripheral portion of a second frame shaped sheet is held between the anode and the cathode. A first metal separator facing the first frame shaped sheet is provided with protruding support structure configured to support an inner peripheral portion of the first frame shaped sheet and an outer peripheral portion of the cathode.

A tab of a load receiver forming a fuel cell separator member includes a base portion in the form of a metal plate, and a resin member covering the base portion. A hole, into which the resin member is partially inserted, is formed in the base portion. The resin member includes a thick portion, and a thin portion positioned closer to a first separator than the thick portion is. The hole is disposed so as to be overlapped with the thick portion.

A storage module of distributed flow battery is provided. An electrochemical reaction is processed with the positive and negative electrolytes to produce and/or discharge direct current and further output the positive and negative electrolytes after the reaction. The module comprises two end plates; two frames disposed between the two end plates; two current collectors disposed between the two frames; two complex cast polar plates disposed between the two current collectors; two electrodes disposed between the two complex cast polar plates; a membrane disposed between the two electrodes; and three gaskets. Therein, two of the gaskets are set to sandwich and enclose one of the two complex cast polar plates; and the other one of the gaskets is set between the other one of the two complex cast polar plates and an adjacent one of the current collectors.

A storage module of distributed flow battery is provided. An electrochemical reaction is processed with the positive and negative electrolytes to produce and/or discharge direct current and further output the positive and negative electrolytes after the reaction. The module comprises two end plates; two frames disposed between the two end plates; two current collectors disposed between the two frames; two complex cast polar plates disposed between the two current collectors; two electrodes disposed between the two complex cast polar plates; a membrane disposed between the two electrodes; and three gaskets. Therein, two of the gaskets are set to sandwich and enclose one of the two complex cast polar plates; and the other one of the gaskets is set between the other one of the two complex cast polar plates and an adjacent one of the current collectors.

A fuel cell separator member forming a power generation cell includes a first separator, and a load receiver member disposed in a manner to protrude outward from the first separator. Reinforcement ribs extending in a direction in which the load receiver member protrudes are provided in a part of an outer peripheral portion of the first separator, the part being adjacent to a joint portion.

A joint separator is formed by joining a first metal separator and a second metal separator together in the state where the first metal separator and the second metal separator are stacked together. A first metal bead of the first metal separator and a second metal bead of the second metal separator have the same bead width. The ratio of the bead width to the bead height is set to be within the range of not less than 2.25 and not more than 3.35, where the bead height is a distance between a protruding end of the first metal bead and a protruding end of the second metal bead.

The invention relates to a joint structure including a continuous joined section that joins together a pair of thin plates layered on each other so as to seal a space between the pair of the thin plates surrounded by the joined section, in which the joined section includes at least one continuous joining line which intersects plural times, and a plurality of spatial areas surrounded by two adjacent intersections of the joining line and the joining line connecting the two intersections.