Abstract:
A fuel cell separator (2) of the present invention has a turn portion of a serpentine-shaped reaction gas passage region (101). In the turn portion, a recessed portion (28) is defined by an outer end (28a) of the turn portion and oblique boundaries between the recessed portion (28) and a pair of passage groove group. In the turn portion, a plurality of protrusions (27), which vertically extend from a bottom face of the recessed portion (28) and are arranged in an island form, are disposed such that one or more protrusions (27) form a plurality of columns lined up and spaced apart from each other with a gap in a direction in which the outer end (28a) extends and one or more protrusions (27) form a plurality of rows lined up and spaced apart from each other with a gap in a direction perpendicular to the direction in which the outer end (28a) extends; and the plurality of protrusions (27) are configured such that flow of the reaction gas is guided by protrusions (27) forming one row in the direction in which the outer end (28a) extends and is disturbed by protrusions forming a row adjacent the one row.
Abstract:
The temperature of cooling fluid in an inlet side manifold is increased during power generation by influence of the temperature of heat generation sections of cells. This causes variation in temperature among unit cells in a fuel cell stack, causing flooding and variation in output voltage. The invention provides a fuel cell in which an increase in temperature of cooling fluid in an inlet side manifold is suppressed, and that has an excellent durability and a stable output voltage. The fuel cell has flow paths for cooling fluid in cathode side separator plates and anode side separator plates, the flow paths connecting an inlet side manifold and an outlet side manifold for cooling fluid. Each of the flow paths for cooling fluid includes a first cooling section for cooling a heat generation section, that is, an area corresponding to a cathode or an anode, and a second cooling section located between the first cooling section and the inlet side manifold for cooling fluid.
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:
There is provided a polymer electrolyte fuel cell capable of: sufficiently suppressing the progress of drying of the polymer electrolyte in the catalyst layers and of the polymer electrolyte membrane, and in addition, the occurrence of flooding, even if the moistened conditions of the fuel gas or the oxidant gas fed to the fuel cell change; suppressing the degradation of the anode, cathode and polymer electrolyte membrane; and thus reducing the deterioration of the cell performance readily and reliably. The polymer electrolyte fuel cell includes: a polymer electrolyte membrane; an anode and a cathode which are arranged in such a manner as to hold the polymer electrolyte membrane between them; and a pair of separators having a first gas flow path for feeding fuel gas to the anode and discharging fuel gas from the anode and a second gas flow path for feeding oxidant gas to the cathode and discharging oxidant gas from the cathode, where a notched portion is made on each of the anode and the cathode in such a position so as to allow the two notched portions to face each other, the polymer electrolyte membrane is held by the pair of separators in that position, and the polymer electrolyte membrane is supported by reinforcing members having gas permeability in the notches.
Abstract:
A method of preserving a PEFC stack of the present invention is a method of preserving a PEFC stack that 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 method comprises preserving the polymer electrolyte fuel cell stack in an uninstalled state under a condition in which an oxygen concentration within the oxidizing agent passage and within the reducing agent passage is lower than an oxygen concentration in atmospheric air.
Abstract:
A polymer electrolyte fuel cell of the present invention includes a membrane-electrode assembly (5) and separators (6A and 6B). Each of the electrodes (4A and 4B) includes a catalyst layer (2A, 2B) and a gas diffusion layer (3A, 3B). One main surface of the catalyst layer contacts the polymer electrolyte membrane (1). The separator (6A) includes a peripheral portion (16A) and a portion (26A) other than the peripheral portion. The peripheral portion (16A) of the separator (6A) is formed in an annular shape when viewed from a thickness direction of the separator (6A) and is a region including a portion located on an inner side of the outer periphery of the separator (6A). The separator (6A) is configured such that a porosity of the peripheral portion (16A) is higher than that of the portion (26A) other than the peripheral portion.
Abstract:
A fuel cell of the present invention includes an electrolyte layer-electrode assembly (5), a first separator (4A), and a second separator (4C). A cooling water channel (8) is formed on a main surface of at least one of the first separator (4A) and the second separator (4C) so as to communicate with at least one of a first cooling water manifold hole (41) and a second cooling water manifold hole (51). A first channel forming portion (11) is located in at least one of the first cooling water manifold hole (41) and the second cooling water manifold hole (51) when viewed from a thickness direction of an electrolyte layer (1) and is provided so as to be opposed to at least a part of an end surface constituting the first cooling water manifold hole (41) and the second cooling water manifold hole (51).
Abstract:
The invention provides a fuel cell separator wherein a first reaction gas channel 131 has a first portion 41 and a second portion 51 located upstream of the first portion 41, the first portion 41 lying closest to the upstream end of the first reaction gas channel 131 among portions located between the second portion 51 and the downstream end of the first reaction gas channel 131, the second portion 51 lying closest to the downstream end among portions located between the upstream end and the first portion 41 of the first reaction gas channel 131. Second reaction gas channels 132, 133 do not exist between the first portion 41 and the upstream end but exist between the second portion 51 and the downstream end. The first reaction gas channel 131 is communicated with at least one (hereinafter referred to as the “specific channel”) of the second reaction gas channels 132, 133 in a portion (hereinafter referred to as the “specific portion”) between the first portion 41 and the downstream end.
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 and 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 first specified portion 81 which is a continuous portion including at least the first portion of the first reactant gas channel 131 and/or a cross-sectional area of a second specified portion 82 which extends continuously from at least a downstream end of the first reactant gas channel 131 is/are smaller than cross-sectional areas of the second reactant gas channels 132 and 133.
Abstract:
A fuel cell comprising: a membrane electrolyte assembly having a polymer electrolyte membrane and a pair of catalyst electrodes, namely an air electrode and a fuel electrode sandwiching the polymer electrolyte membrane; a pair of separators, namely an air electrode separator and a fuel electrode separator sandwiching the membrane electrolyte assembly; two or more oxidizing gas channels running in a certain direction for the purpose of supplying an oxidizing gas to the air electrode; and two or more linear fuel gas channels arranged parallel to the certain direction for the purpose of supplying a fuel gas to the fuel electrode. Large gaps and small gaps are provided alternately between adjacent two oxidizing gas channels along the certain direction, and the fuel gas channels do not overlap portions of the oxidizing gas channels, that are parallel to the fuel gas channels.