Abstract:
A polymer electrolyte fuel cell system of the present invention comprises cells 10, a stack 100, a temperature control device (160, 140, 40, 41), an anode gas supplier 110, a cathode gas supplier 120, and a controller 300. When a power generation output of the stack 100 is reduced, the controller 300 controls the anode gas supplier 110 and the cathode gas supplier 120 to reduce a supply amount of the anode gas and a supply amount of the cathode gas, and controls at least one of the anode gas supplier 110, the cathode gas supplier 120, and the temperature control device 100 to cause a dew point temperature of a gas supplied to at least one of the anode gas channels and the cathode gas channels to be higher relative the temperature of the stack 100 so that the gas becomes supersaturated or more supersaturated than prior to causing the dew point temperature of the gas to be higher.
Abstract:
Disclosed is a fuel cell including: a membrane electrolyte assembly which includes a polymer electrolyte membrane and a pair of catalyst electrodes between which the polymer electrolyte membrane is held; and separators A and B between which the membrane electrolyte assembly is held, wherein the separator A includes first gas flow channels a1 and second gas flow channels a2 which are placed adjacent to the first gas flow channels al, the first and second gas flow channels a1 and a2 supplying an oxidizing gas or a fuel gas to the membrane electrolyte assembly, the first and second gas flow channels a1 and a2 run in parallel to each other and are alternately arranged, the first gas flow channels a1 are larger in cross sectional area than the second gas flow channels a2; wherein the separator B includes first gas flow channels b1 which run in parallel to the first and second gas flow channels a1 and a2, and second gas flow channels b2 which are placed adjacent to the first gas flow channels b1, the first and second gas flow channels supplying an oxidizing gas or a fuel to the membrane electrolyte assembly, the first and second gas flow channels b1 and b2 run in parallel to each other and are alternately arranged; and wherein the oxidizing gas or fuel gas supplied in the first and second gas flow channels a1 and a2 flows in opposite direction to the oxidizing gas or fuel gas supplied in the first and second gas flow channels b1 and b2.
Abstract:
A polymer electrolyte fuel cell may have a cell stack of a plurality of unit cells. Each of the unit cells includes a hydrogen-ion conductive polymer electrolyte membrane, an anode and a cathode sandwiching the polymer electrolyte membrane, an anode-side separator having a gas flow channel for supplying a fuel gas to the anode, and a cathode-side separator having a gas flow channel for supplying an oxidant gas to the cathode. A pair of current collector plates sandwiches the cell stack, and a pair of end plates clamps the cell stack and the current collector plates under pressure. The current collector plates have a conductive carbon material as a main component, and have a terminal section for connecting a power output cable in the vicinity of an inlet-side manifold for the fuel gas or the oxidant gas.
Abstract:
A polymer electrolyte fuel cell power generation system is disclosed which comprises: a fuel cell having a plurality of cells each having a polymer electrolyte membrane and an anode and cathode that are formed so as to sandwich the polymer electrolyte membrane therebetween, a fuel gas path formed so as to guide fuel gas from an inlet of the fuel gas to the anode of each cell and discharge the fuel gas to the outside therefrom, an oxidizing gas path formed so as to guide oxidizing gas from an inlet of the oxidizing gas to the cathode of each cell and discharge the oxidizing gas to the outside therefrom, and a cooling fluid path formed so as to guide a cooling fluid from an inlet of the cooling fluid to a cooling fluid supply manifold and then to a region opposite to power generation regions constituted by the anodes and cathodes of the plurality of cells and discharge the cooling fluid to the outside therefrom through an outlet of the cooling fluid, the fuel cell being configured to generate electric power accompanied with heat generation by a reaction between the fuel gas and the oxidizing gas within the power generation regions; a fuel gas supply apparatus for feeding the fuel gas to the inlet of the fuel gas of the fuel cell; an oxidizing gas supply apparatus for feeding the oxidizing gas to the inlet of the oxidizing gas of the fuel cell; a cooling fluid supply system for causing the cooling fluid to flow through the cooling fluid path of the fuel cell, thereby cooling the fuel cell; and a control unit, wherein the control unit controls, during the power generation, the temperature of the cooling fluid at the inlet of the cooling fluid 401 though the cooling fluid supply system so as to satisfy T1≧T2+1° C. where T1 is a corresponding dew-point temperature of at least either the fuel gas or oxidizing gas at the inlet thereof and T2 is the temperature of the cooling fluid at the inlet of the cooling fluid 401.
Abstract:
The polymer electrolyte fuel cell of the present invention is equipped with a cell having an MEA having a hydrogen ion-conducting polymer electrolyte membrane and an anode and a cathode sandwiching the polymer electrolyte membrane; a platelike anode-side separator positioned on one side of the MEA so that the front surface thereof contacts the anode, with fuel gas passages through which fuel gas flows being formed in the front surface; and a platelike cathode-side separator positioned on the other side of the MEA so that the front surface thereof contacts the cathode, with oxidizing gas passages through which oxidizing gas flows being formed in the front surface; a cell stack in which a plurality of said cells is stacked; and a cooling water flow passage, through which cooling water flows, formed on at least the rear surface of one from among the anode-side separator and the cathode-side separator of at least a prescribed cell in said cell stack; where said fuel gas, oxidizing gas, and cooling water flow through said fuel gas passage, oxidizing gas passage, and cooling water passage, respectively, in a manner not running counter to gravity.
Abstract:
A polymer electrolyte fuel cell according to the present invention includes: an electrolyte layer-electrode assembly (5); a first separator (6A) provided with a first reaction gas flowing region; and a second separator (6B) provided with a second reaction gas flowing region. In the first separator (6A), among one or more first turn portions (28), at least one first turn portion (28) is provided with a first recess (48) and first projections (58). In the second separator (6B), among one or more second turn portions (29), at least one second turn portion (29) is provided with a second recess (49) and second projections (59). When seen in the thickness direction of the first separator (6A), an overlap area is less than or equal to 5% of a gross area, the overlap area being a total overlap area between the first and second recesses (48, 49), the gross area being the total of the following areas: the area of all the first recesses (48); and the area of all the second recesses (49).
Abstract:
A fuel cell separator of the present invention is a plate-shaped fuel cell separator including a reaction gas supply manifold hole (21), a reactant gas discharge manifold hole (22), a groove-shaped first reactant gas channel (131), and one or more groove-shaped second reaction gas channels (132, 133), wherein the first reactant gas channel (131) includes a first portion (41) and a second portion (51) located upstream of the first portion (41), and a cross-sectional area of a continuous portion extending from the upstream end of the first reactant gas channel (131) and/or a cross-sectional area of at least a portion of the first reactant gas channel (131) which lies downstream of the first portion (41) is/are smaller than cross-sectional areas of the second reactant gas channels (132, 133).
Abstract:
Provided is a method of preserving a PEFC stack, which is capable of controlling degradation of performance of the PEFC stack during a time period that elapses from when the stack is placed in an uninstalled state until it is placed in an installation position and is practically used. Provided is a preservation assembly of the PEFC stack which is capable of sufficiently inhibiting degradation of performance of the PEFC stack particularly during a time period that elapses from when the stack is placed in the uninstalled state until it is placed in the installation position and is practically used. A method of preserving a PEFC stack that is provided with an oxidizing agent passage (30) having an inlet and an outlet and extending through a cathode and a reducing agent passage (40) having an inlet and an outlet and extending through an anode, comprising preserving the PEFC (200) stack in an uninstalled state in such a manner that an interior of the oxidizing agent passage (30) and an interior of the reducing agent passage (40) are set in a pressure-reduced state.
Abstract:
A preservation assembly of a polymer electrolyte fuel cell stack is provided. The assembly includes an uninstalled polymer electrolyte fuel cell stack and sealing units. The uninstalled polymer electrolyte fuel cell stack is provided with an oxidizing agent passage having an inlet and an outlet and extending through a cathode and a reducing agent passage having an inlet and an outlet and extending through an anode. The sealing units include sealing plugs or containers and are configured to seal the inlet and the outlet of the oxidizing agent passage within which an oxygen concentration has been decreased and to seal the inlet and the outlet of the reducing agent passage within which the oxygen concentration has been decreased. The uninstalled polymer electrolyte fuel cell stack is in a state before an assembled polymer electrolyte fuel cell stack is incorporated into a fuel cell system.
Abstract:
Provided is a method of preserving a PEFC stack, which is capable of controlling degradation of performance of the PEFC stack during a time period that elapses from when the stack is placed in an uninstalled state until it is placed in an installation position and is practically used. Provided is a preservation assembly of the PEFC stack which is capable of sufficiently inhibiting degradation of performance of the PEFC stack particularly during a time period that elapses from when the stack is placed in the uninstalled state until it is placed in the installation position and is practically used. A method of preserving a PEFC stack that is provided with an oxidizing agent passage (30) having an inlet and an outlet and extending through a cathode and a reducing agent passage (40) having an inlet and an outlet and extending through an anode, comprising preserving the PEFC (200) stack in an uninstalled state in such a manner that an interior of the oxidizing agent passage (30) and an interior of the reducing agent passage (40) are set in a pressure-reduced state.