A fuel cell includes: an electrolyte membrane-electrode structure in which electrodes are provided on both surfaces of an electrolyte membrane and a frame member is joined to the outer peripheral portion of the electrolyte membrane; and a pair of separators for sandwiching the electrolyte membrane-electrode structure, wherein an overlapping portion of the outer peripheral portion of the electrode and the inner peripheral portion of the frame member is disposed in a flow field section in which flow field grooves for allowing a reactant gas to flow along the electrode surface of the electrolyte membrane-electrode structure are formed, and is disposed so as not to extend into buffers between the flow field section and passages.

A method of selecting a thermoplastic-resin adhesive provided so as to be exposed to a fluid flow path of a power generation cell includes a load application step, an exposing step, a measurement step, and a selecting step. In the load application step, a compressive load is applied to a laminate body in a laminating direction thereof, the laminate body being formed by sandwiching an adhesive between a first resin film and a second resin film. In the exposing step, the laminate body is exposed to an environment heated to a predetermined temperature and humidified to a predetermined humidity. In the measurement step, a flow amount of the adhesive during the exposing step is measured. In the selecting step, the adhesive having the flow amount equal to or less than a predetermined amount is selected as an adhesive used for the power generation cell.

A shelf device including a plurality of shelves is prepared. A quadrangular plate-shaped cell unit can be placed on each of the selves. A plurality of cell units is placed such that the cell units are disposed on respective shelves. The cell unit is disposed on the shelf such that the second part is placed between the recessed portions. The cell units are disposed on the shelves such that corresponding recessed portions of the cell units overlap each other. A pair of jigs extending in a first direction is placed such that the jigs are disposed inside the recessed portions of the cell units. The shelf device is caused to retreat from the cell units and the jigs, and relative positions of the cell units are changed along the jigs so that the cell units make contact with each other.

A shelf device including a plurality of shelves is prepared. A quadrangular plate-shaped cell unit can be placed on each of the selves. A plurality of cell units is placed such that the cell units are disposed on respective shelves. The cell unit is disposed on the shelf such that the second part is placed between the recessed portions. The cell units are disposed on the shelves such that corresponding recessed portions of the cell units overlap each other. A pair of jigs extending in a first direction is placed such that the jigs are disposed inside the recessed portions of the cell units. The shelf device is caused to retreat from the cell units and the jigs, and relative positions of the cell units are changed along the jigs so that the cell units make contact with each other.

Methods and systems are provided for a redox flow battery system. In one example, the redox flow battery system has a set of pressure plates with a sub-stack separator plate arranged between the first pressure plate and the second pressure plate and a first cell stack positioned between the first pressure plate and the sub-stack separator plate. The redox flow battery system may further include a second cell stack positioned between the second pressure plate and the sub-stack separator plate.

A fuel cell stack includes a plurality of bipolar plates wherein each bipolar plate has at least an anode plate and a cathode plate, and a plurality of membrane electrode assemblies being sandwiched by the bipolar plates, wherein each membrane electrode assembly has at least an anode and a cathode which are separated by a membrane, wherein the bipolar plates sandwich the membrane electrode assembly in such a way that the anode of the membrane electrode assembly faces the anode plate of a first bipolar plate and the cathode of the same membrane electrode assembly faces the cathode plate of a second bipolar plate; and wherein a cell pitch of the fuel cell stack is defined by a distance of two adjacent membrane electrode assemblies, wherein at borders of the bipolar plates of the fuel cell stack, an overall distance between the anode plate of the first bipolar plate and the cathode plate of the second bipolar plate, which is measured over the sandwiched membrane electrode assembly, is equal to the cell pitch of the fuel cell stack.

An electrochemical reaction unit including a unit cell including an electrolyte layer, and a cathode and an anode that face each other in a first direction with the electrolyte layer intervening therebetween; and a felt member containing a ceramic material or a metal and a silica component. The felt member includes both a first crystal structure and a second crystal structure, which is an SiO.sub.2 crystal structure. Also disclosed is an electrochemical reaction cell stack including a plurality of electrochemical reaction units disposed in the first direction, at least one of the electrochemical reaction units being the above-described unit. Yet further disclosed is a method for producing the electrochemical reaction unit.

An electrochemical reaction unit including a unit cell including an electrolyte layer, and a cathode and an anode that face each other in a first direction with the electrolyte layer intervening therebetween; and a felt member containing a ceramic material or a metal and a silica component. The felt member includes both a first crystal structure and a second crystal structure, which is an SiO.sub.2 crystal structure. Also disclosed is an electrochemical reaction cell stack including a plurality of electrochemical reaction units disposed in the first direction, at least one of the electrochemical reaction units being the above-described unit. Yet further disclosed is a method for producing the electrochemical reaction unit.

Provided are a fuel cell and a method for manufacturing the fuel cell capable of enhancing the joining (joint strength) with a resin sheet and contributing to reduction in the material cost and the product cost. A GDL (e.g., An-GDL) has a protrusion protruding to the outside of a MEA, and the resin sheet is bonded with the GDL at the protrusion of the GDL via the adhesive layer on the outside of the MEA.

Provided are a fuel cell and a method for manufacturing the fuel cell capable of enhancing the joining (joint strength) with a resin sheet and contributing to reduction in the material cost and the product cost. A GDL (e.g., An-GDL) has a protrusion protruding to the outside of a MEA, and the resin sheet is bonded with the GDL at the protrusion of the GDL via the adhesive layer on the outside of the MEA.