Abstract:
A polymer electrolyte fuel cell of the present invention includes a membrane-electrode assembly (5) and separators (6A, 6B). A plurality of reactant gas channels are formed on a main surface of at least one of the separator (6A, 6B) and a gas diffusion layer (3A, 3B). In a case where among the plurality of reactant gas channels, a reactant gas channel overlapping the peripheral portion of the electrode (4A, 4B) twice is defined as a first reactant gas channel, and a reactant gas channel formed to overlap the peripheral portion of the electrode (4A, 4B) and formed such that the length of a portion overlapping the peripheral portion is longer than a predetermined length is defined as a second reactant gas channel, the second reactant gas channel is formed such that the flow rate of a reactant gas flowing therethrough is lower than that of the reactant gas flowing through the first reactant gas channel or the second reactant gas channel does not exist.
Abstract:
A polymer electrolyte fuel cell of the present invention includes a membrane electrode assembly (5) having a pair of electrodes (4a, 4b) sandwiching a portion of a polymer electrolyte membrane (1) which is inward relative to a peripheral portion thereof, a first separator (6a), and a second separator (6b), the first separator (6a) is provided with a first reaction gas channel (8) on one main surface, the second separator (6b) is provided with a second reaction gas channel (9) on one main surface such that the second reaction gas channel (9) has a second rib portion (12), the first reaction gas channel (8) is formed such that a ratio of a first reaction gas channel width of an upstream portion (18b) to the second rib portion (12) is set larger than a ratio of a first reaction gas channel width of a downstream portion (18c) to the second rib portion (12), and the ratio of the first reaction gas channel width of the upstream portion (18b) to the second rib portion (12) is a predetermined ratio.
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 separator having a turn portion of a serpentine-shaped reaction gas passage region. In the turn portion, a recessed portion is defined by an outer end of the turn portion and oblique boundaries between the recessed portion and a pair of passage groove group. In the turn portion, a plurality of protrusions, which vertically extend from a bottom face of the recessed portion and are arranged in an island form, are disposed such that one or more protrusions form a plurality of columns lined up and spaced apart from each other with a gap in a direction in which the outer end extends and one or more protrusions 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 extends.
Abstract:
A polymer electrolyte fuel cell of the present invention includes a membrane-electrode assembly (5) and separators (6A, 6B). A plurality of reactant gas channels are formed on a main surface of at least one of the separator (6A, 6B) and a gas diffusion layer (3A, 3B). In a case where among the plurality of reactant gas channels, a reactant gas channel overlapping the peripheral portion of the electrode (4A, 4B) twice is defined as a first reactant gas channel, and a reactant gas channel formed to overlap the peripheral portion of the electrode (4A, 4B) and formed such that the length of a portion overlapping the peripheral portion is longer than a predetermined length is defined as a second reactant gas channel, the second reactant gas channel is formed such that the flow rate of a reactant gas flowing therethrough is lower than that of the reactant gas flowing through the first reactant gas channel or the second reactant gas channel does not exist.
Abstract:
A preservation assembly of a 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. The PEFC 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 PEFC stack is preserved in an uninstalled state in such a manner that an interior of the oxidizing agent passage and an interior of the reducing agent passage are set in a pressure-reduced state.
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:
Provided is a fuel cell system which is capable of well preventing deterioration of performance of a fuel cell stack or well restoring deteriorated performance of the fuel cell stack and of suppressing deterioration of durability of the fuel cell stack, and a method of operating the fuel cell system. In a fuel cell system of the present invention including a fuel cell stack 100 in which an anode gas passage, a cathode gas passage, and a heat transmission medium passage have a structure in which inlet-side regions of the anode gas passage, the cathode gas passage, and the heat transmission medium passage substantially overlap with each other and outlet-side regions of the anode gas passage, the cathode gas passage, and the heat transmission medium passage substantially overlap with each other as viewed from a direction in which the unit cells are stacked, comprises at least one of an anode gas flow inverting device 122 for inverting a flow direction of the anode gas in the anode gas passage from a forward direction A to a reverse direction B which is opposite to the forward direction, and a cathode gas flow inverting device 123 for inverting a flow direction of the cathode gas in the cathode gas passage from the forward direction A to the reverse direction B; a heat transmission medium flow inverting device 124 for inverting a flow direction of the heat transmission medium in the heat transmission medium passage from the forward direction A to the reverse direction B; and a control system 300 configured to control the inverting devices 122, 123, and 124.
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 (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.