JP2013110058A - Separator for fuel cell - Google Patents

Abstract

PROBLEM TO BE SOLVED: To restrain drying of an electrolyte membrane in an exit region of off-gas in a fuel cell having a membrane electrode assembly.SOLUTION: An anode-side separator 100 comprises: serpentine type gas passages 40, 42, 44, 46, 48; a water storage part 44e; an exit buffer part 50; a partition wall 52; an anode off-gas introduction passage 60; and an anode off-gas discharging part 70. The water storage part 44e is branched from the gas passage 48 and connected, and branches and introduces some of hydrogen flowing in the gas passage 48 and temporarily stores water contained in the introduced hydrogen. The water storage part 44e is provided adjacent perpendicularly above the exit buffer part 50 at a portion opposed to an anode of the membrane electrode assembly. The water storage part 44e is formed so that the stored water is in contact with the anode of the membrane electrode assembly. The partition wall 52 isolates the water storage part 44e from the exit buffer part 50 at the portion opposed to the anode of the membrane electrode assembly.

Description

  The present invention relates to a fuel cell separator.

  A fuel cell that generates electricity by an electrochemical reaction between a fuel gas and an oxidant gas has attracted attention as an energy source. This fuel cell is generally configured by sandwiching a membrane electrode assembly formed by joining electrodes on both surfaces of an electrolyte membrane with a separator. On the surface of the separator, a gas flow path is formed for flowing a reaction gas used for power generation along the surface of the electrode of the fuel cell. The gas flow path may be a serpentine-type gas flow path that is formed so that the reaction gas snakes along the surface of the electrode of the fuel cell.

  And about such a fuel cell, conventionally, the various techniques for improving the drainage property from a reactive gas flow path are proposed. For example, in Patent Document 1 below, in a fuel cell, a buffer portion and a connection passage are provided between an outlet side of a serpentine type fuel gas flow path and a fuel gas outlet communication hole, and a connection passage is provided. It is described that the flow path opening cross-sectional area is made smaller than the flow path opening cross-sectional area on the outlet side of the fuel gas flow path. According to the technique described in Patent Document 1 below, the flow rate of the fuel gas discharged from the connection channel to the fuel gas outlet communication hole can be increased, and the drainage can be improved.

JP 2006-278177 A

  By the way, when the fuel cell is operated at a high temperature, the electrolyte membrane is easily dried in the outlet region of the fuel gas (off gas) in the membrane electrode assembly. When the electrolyte membrane is dried, the proton conductivity is lowered, and the power generation performance of the fuel cell is lowered. However, in the technique described in Patent Document 1, the drying of the electrolyte membrane in the outlet region of the fuel gas (off gas) has not been considered.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to suppress drying of an electrolyte membrane in an off-gas outlet region of a membrane electrode assembly in a fuel cell including the membrane electrode assembly. .

  SUMMARY An advantage of some aspects of the invention is to solve at least a part of the problems described above, and the invention can be implemented as the following forms or application examples.

[Application Example 1]
A fuel cell separator,
A serpentine type gas flow path formed such that a reactive gas for power generation flows in a meandering manner along the surface of the electrode in a membrane electrode assembly formed by bonding electrodes to both surfaces of an electrolyte membrane;
An off-gas discharge part for discharging off-gas discharged from the electrode, penetrating in the thickness direction of the fuel cell separator;
A buffer portion connected to the end of the gas flow path and into which the off-gas discharged from the end of the gas flow path flows, the inner wall facing the electrode, from the inner wall to the surface of the electrode A buffer portion formed with a plurality of protrusions protruding toward the electrode and contacting the electrode;
An off-gas outlet flow path for leading the off-gas flowing into the buffer section to the off-gas discharge section;
A water storage section that is branched and connected from the gas flow path, partially introduces the reaction gas flowing through the gas flow path, and temporarily stores water contained in the introduced reaction gas. Thus, when the fuel cell separator is stacked on the membrane electrode assembly, the water stored is in contact with the electrode when the fuel cell separator is stacked on the membrane electrode assembly. A water reservoir formed in the
In a part facing the electrode, a partition wall that separates the water storage part and the buffer part,
A fuel cell separator.

  In the fuel cell using the fuel cell separator of Application Example 1, water (for example, generated water generated by power generation) flows through the serpentine-type gas flow path and the buffer portion together with the reaction gas and the off gas. The water is discharged together with the off gas to the off gas discharge section through the off gas outlet channel. In this fuel cell, water contained in a part of the reaction gas flowing through the gas flow path is temporarily stored in a water storage unit provided adjacent to the vertical upper part of the buffer unit. And the water stored in this water storage part contacts the electrode of the membrane electrode assembly laminated | stacked on the separator for fuel cells, and osmose | permeates a membrane electrode assembly. Then, the water that permeates the membrane electrode assembly passes through the partition wall by gravity from the portion facing the water storage portion in the membrane electrode assembly, and the portion facing the buffer portion adjacent vertically below the water storage portion, that is, And move to the off-gas outlet region in the membrane electrode assembly. Therefore, by using the fuel cell separator of Application Example 1 for a fuel cell, drying of the electrolyte membrane in the off-gas outlet region of the membrane electrode assembly can be suppressed. The present invention is particularly effective during high-temperature operation of a fuel cell in which the electrolyte membrane is easily dried in the off-gas outlet region of the membrane electrode assembly.

[Application Example 2]
A separator for a fuel cell according to Application Example 1,
The gas flow path is
A first gas flow path for flowing the reaction gas in a first direction along a horizontal direction;
A second gas flow path connected to an end of the first gas flow path for flowing the reaction gas flowing in from the first gas flow path vertically downward;
A third gas flow path connected to an end of the second gas flow path for flowing the reaction gas flowing in from the second gas flow path in a second direction opposite to the first direction; ,
Including
The buffer unit is connected to a terminal end of the third gas flow path,
The water storage part is branched and connected from the first gas flow path, and a part of the reaction gas flowing through the first gas flow path is branched and introduced.
Fuel cell separator.

  In the fuel cell separator of Application Example 2, the gas flow path, the water storage unit, the buffer unit, and the partition walls can be arranged in an area-efficient manner at a portion facing the electrode of the membrane electrode assembly. Therefore, it is possible to reduce the size of the fuel cell separator and further to reduce the size of the fuel cell.

[Application Example 3]
A separator for a fuel cell according to Application Example 2,
The terminal end of the third gas channel, the buffer unit, and the off-gas outlet channel are arranged side by side in the horizontal direction,
The upper end of the off-gas outlet channel is arranged vertically below the upper end of the third gas channel,
The partition has an inclined surface that is continuously inclined from the upper end of the third gas channel to the upper end of the off-gas outlet channel.
Fuel cell separator.

  In the fuel cell separator of Application Example 3, the end of the third gas flow path, the buffer unit, and the off-gas outlet flow path are arranged side by side in the horizontal direction. It is arranged vertically below the upper end of the gas flow path. In this case, if there is a step between the upper end of the third gas flow path and the upper end of the off-gas outlet flow in the buffer unit, water tends to stay in the step portion. On the other hand, in the fuel cell separator of Application Example 3, the partition wall has an inclined surface that is continuously inclined from the upper end of the third gas passage to the upper end of the off-gas outlet passage. . For this reason, it is possible to eliminate a step between the upper end of the third gas flow path and the upper end of the off-gas outlet flow in the buffer unit. In the fuel cell using the fuel cell separator according to the application example 3, the water flowing into the buffer portion is separated from the partition wall by the off gas or the flow of the scavenging gas supplied from the outside of the fuel cell when the fuel cell is stopped. It can be made to flow along the inclined surface. Therefore, in the buffer part, it is possible to suppress water from staying in the buffer part when the fuel cell is stopped, as compared with the case where there is a step between the upper end of the third gas flow path and the upper end of the off-gas outlet flow. . As a result, when the temperature is below freezing, it is possible to prevent water remaining in the buffer section and the off-gas outlet flow path from freezing and closing the gas flow path.

[Application Example 4]
The fuel cell separator according to any one of Application Examples 1 to 3,
A plurality of projecting portions projecting from the inner wall surface toward the surface side of the electrode on the inner wall surface of the water storage portion facing the electrode and contacting the electrode, wherein the plurality of projecting portions having conductivity are provided. Formed,
Fuel cell separator.

  By using the fuel cell separator of Application Example 4 for a fuel cell, the internal resistance of the fuel cell can be reduced as compared with the case where the plurality of protrusions are not formed on the inner wall surface of the water storage portion.

3 is an explanatory diagram showing a schematic configuration of an anode separator 100. FIG. It is explanatory drawing which shows the effect of the anode side separator.

Hereinafter, embodiments of the present invention will be described based on examples.
A. Example:
FIG. 1 is an explanatory diagram showing a schematic configuration of an anode separator 100 as one embodiment of the present invention. The anode separator 100 is laminated on the anode side of the membrane electrode assembly in a fuel cell (not shown). In FIG. 1, the top view which looked at the anode side separator 100 from the side contact | abutted with the anode of a membrane electrode assembly was shown.

  The membrane electrode assembly is configured by joining a catalyst layer and a gas diffusion layer as electrodes to both surfaces of an electrolyte membrane having proton conductivity. The catalyst layer is formed by applying a catalyst ink on the surface of the electrolyte membrane and drying it. In this embodiment, an electrolyte membrane made of a solid polymer such as Nafion (registered trademark) is used as the electrolyte membrane. In this embodiment, carbon cloth is used as the gas diffusion layer. As the gas diffusion layer, other materials having gas diffusibility and conductivity such as carbon paper may be used.

  The anode separator 100 is produced by processing one metal plate. The anode-side separator 100 is formed with a flow path through which a gas or a cooling medium flows, for example, by pressing or punching.

  As shown in FIG. 1, the anode separator 100 includes a hydrogen supply unit 10, a hydrogen introduction channel 20, an inlet buffer unit 30, a plurality of gas channels 40, 42, 44, 46, 48, A section 44e, an outlet buffer section 50, a partition wall 52, an anode off-gas outlet passage 60, and an anode off-gas discharge section 70. The inlet buffer unit 30, the plurality of gas flow paths 40, 42, 46, and 48, the water storage unit 44e, the outlet buffer unit 50, and the partition wall 52 are in a rectangular region facing the anode of the membrane electrode assembly (see FIG. It is arranged in a rectangular area surrounded by a chain line.

  The hydrogen supply unit 10 (described as “hydrogen in”) is a through-hole penetrating in the thickness direction of the anode-side separator 100. The hydrogen supply unit 10 forms a flow path for flowing hydrogen supplied from the outside of the fuel cell in the stacking direction of the fuel cell. Further, the anode off-gas discharge unit 70 (described as “hydrogen out”) is a through-hole penetrating in the thickness direction of the anode-side separator 100. The anode off gas discharge unit 70 forms a flow path for flowing the anode off gas discharged from the anode of the membrane electrode assembly in the stacking direction of the fuel cell and discharging it to the outside of the fuel cell.

  The hydrogen supply unit 10 and the plurality of gas channels 40 are in communication with each other via the hydrogen introduction channel 20 and the inlet buffer unit 30. On the inner wall surface of the inlet buffer unit 30 facing the anode of the membrane electrode assembly, a plurality of projecting portions 30p are formed that protrude from the inner wall surface toward the surface that comes into contact with the anode and that come into contact with the anode.

  Hydrogen supplied from the outside of the fuel cell flows from the hydrogen supply unit 10 into the inlet buffer unit 30 through the hydrogen introduction channel 20. The hydrogen is dispersed by the plurality of protrusions 30 p in the inlet buffer unit 30 and distributed to the plurality of gas flow paths 40.

  The plurality of gas flow paths 40, 42, 44, 46, 48 are serpentine-type gas flow paths formed so that hydrogen meanders and flows along the surface of the anode of the membrane electrode assembly. In this serpentine type gas flow path, the plurality of gas flow paths 40 are gas flow paths for flowing the hydrogen flowing in from the inlet buffer section 30 in a direction along the horizontal direction (in the illustrated example, from right to left). is there. The plurality of gas flow paths 42 are connected to the terminal ends of the plurality of gas flow paths 40 and are flow paths for allowing the hydrogen flowing in from the plurality of gas flow paths 40 to flow vertically downward. Further, the plurality of gas flow paths 44 are connected to the terminal ends of the plurality of gas flow paths 42, respectively, and hydrogen flowing in from the plurality of gas flow paths 42 is respectively in a horizontal direction (from the left in the illustrated example). It is a gas flow path for flowing to the right). Further, the plurality of gas flow paths 46 are connected to the terminal ends of the plurality of gas flow paths 44, respectively, for flowing hydrogen flowing in from the plurality of gas flow paths 44 vertically downward. Further, the plurality of gas flow paths 48 are connected to the respective terminal ends of the plurality of gas flow paths 46, and hydrogen flowing in from the plurality of gas flow paths 46 is respectively directed along the horizontal direction (in the illustrated example, from the right side). This is a gas flow path for flowing to the left. The plurality of gas flow paths 44 correspond to the first gas flow paths in [Means for Solving the Problems]. The gas flow path 46 corresponds to the second gas flow path in [Means for Solving the Problems]. The gas channel 48 corresponds to the third gas channel in [Means for Solving the Problems].

  The water reservoir 44e is disposed vertically below the plurality of gas passages 44, and is branched and connected from the gas passage 44 located at the lowest of the plurality of gas passages 44. The water storage unit 44e branches and introduces part of the hydrogen flowing through the plurality of gas flow paths 44, and temporarily stores the water contained in the introduced hydrogen. A part of the hydrogen introduced into the water storage part 44e is consumed by the membrane electrode assembly at a portion facing the water storage part 44e, and the unconsumed hydrogen returns to the gas flow path 44. The water storage part 44e is provided adjacent to the upper part of the outlet buffer part 50 in the part facing the anode of the membrane electrode assembly. The water storage part 44e is formed so that the stored water comes into contact with the anode of the membrane electrode assembly when the anode separator 100 is laminated on the membrane electrode assembly. The water storage part 44e and the outlet buffer part 50 are separated by a partition wall 52. Therefore, the hydrogen flowing into the water storage section 44e and the stored water do not flow directly into the outlet buffer section 50. The inner wall surface of the water storage section 44e facing the anode of the membrane electrode assembly is formed with a plurality of projecting sections 44p projecting from the inner wall surface to the surface contacting the anode and contacting the anode.

  The plurality of gas flow paths 48 and the anode off-gas discharge section 70 communicate with each other via the outlet buffer section 50 and the anode off-gas outlet flow path 60. The outlet buffer unit 50 is connected to the ends of the plurality of gas flow paths 48. On the inner wall surface of the outlet buffer unit 50 facing the anode of the membrane electrode assembly, a plurality of projections 50p are formed which protrude from the inner wall surface to the surface side in contact with the anode and to contact the anode. The exit buffer unit 50 corresponds to the buffer unit in [Means for Solving the Problems]. Further, the anode off-gas outlet channel 60 corresponds to the off-gas outlet channel in [Means for Solving the Problems].

  The terminal ends of the plurality of gas channels 48, the outlet buffer unit 50, and the anode off-gas outlet channel 60 are arranged side by side in the horizontal direction. Further, the upper end of the anode off-gas outlet channel 60 is arranged vertically below the upper ends of the plurality of gas channels 48. The partition 52 has an inclined surface that is continuously inclined from the upper ends of the plurality of gas passages 48 to the upper end of the anode off-gas outlet passage 60.

  The anode off gas discharged from the terminal ends of the plurality of gas flow paths 48 flows into the outlet buffer unit 50. At this time, water (for example, generated water generated by power generation) also flows into the outlet buffer unit 50 together with the anode off gas. In the outlet buffer unit 50, the flow direction of the anode off gas containing water is dispersed by the plurality of protrusions 50p. Then, the anode offgas and the water that have flowed into the outlet buffer unit 50 are led out from the outlet buffer unit 50 to the anode offgas discharge unit 70 through the anode offgas outlet channel 60.

  FIG. 2 is an explanatory view showing the effect of the anode separator 100. FIG. 2 shows a cross-sectional view of the vicinity of the water storage section 44e, the outlet buffer section 50, and the partition 52 in the fuel cell using the anode separator 100. In FIG. 2, the flow of water in the vicinity of the water storage unit 44e, the outlet buffer unit 50, and the partition wall 52 is indicated by arrows.

  In the fuel cell using the anode-side separator 100 of the present embodiment, the water contained in a part of the hydrogen flowing through the gas flow path 44 is temporarily stored in the water stored vertically adjacent to the outlet buffer unit 50. The water is stored in the portion 44e. The water stored in the water storage section 44e comes into contact with the membrane electrode assembly stacked on the anode separator 100 and permeates the membrane electrode assembly. And the water which permeate | transmitted this membrane electrode assembly passes the partition 52 by gravity from the site | part corresponding to the water storage part 44e in a membrane electrode assembly, and the exit buffer part 50 adjacent to the perpendicular | vertical downward direction of the water storage part 44e and It moves to the opposite part, that is, the anode off-gas outlet region in the membrane electrode assembly. Therefore, by using the anode-side separator 100 of this embodiment for a fuel cell, it is possible to suppress drying of the electrolyte membrane in the anode off-gas outlet region of the membrane electrode assembly. The anode-side separator 100 of this embodiment is particularly effective during high-temperature operation of the fuel cell in which the electrolyte membrane is easily dried in the off-gas outlet region of the membrane electrode assembly.

  Moreover, in the anode side separator 100 of the present embodiment, the serpentine type gas flow path includes gas flow paths 40, 42, 44, 46 and 48. The outlet buffer unit 50 is connected to the end of the gas flow path 48. The water reservoir 44e is branched and connected from the gas flow path 44, and a part of hydrogen flowing through the gas flow path 44 is branched and introduced. For this reason, as shown in FIG. 1, gas flow paths 40, 42, 44, 46, 48, a water storage part 44 e, an outlet buffer part 50, and a partition wall 52 are provided at portions facing the anode of the membrane electrode assembly. Can be arranged efficiently in an area. Therefore, it is possible to reduce the size of the anode-side separator 100 and further reduce the size of the fuel cell.

  In the anode-side separator 100 of the present embodiment, the end of the gas flow path 48, the outlet buffer unit 50, and the anode off-gas outlet flow path 60 are arranged side by side in the horizontal direction. Is arranged vertically below the upper end of the gas flow path 48. In this case, if there is a step between the upper end of the gas channel 48 and the upper end of the anode off-gas outlet channel 60 in the outlet buffer unit 50, water tends to stay in the stepped portion. On the other hand, in the anode-side separator 100 of the present embodiment, the partition wall 52 has an inclined surface that is continuously inclined from the upper end of the gas passage 48 to the upper end of the anode off-gas outlet passage 60. Yes. For this reason, in the outlet buffer part 50, the level | step difference of the upper end of the gas flow path 48 and the upper end of the anode off gas derivation | leading-out flow path 60 can be eliminated. In the fuel cell using the anode-side separator 100 of the present embodiment, the water flowing into the outlet buffer unit 50 is used as the anode off-gas or the flow of scavenging gas supplied from the outside of the fuel cell when the fuel cell is stopped. Thus, the fluid can flow along the inclined surface of the partition wall 52. Therefore, in the outlet buffer unit 50, water stays in the outlet buffer unit 50 when the fuel cell is stopped, compared to the case where there is a step between the upper end of the gas channel 48 and the upper end of the anode off-gas outlet channel 60. Can be suppressed. As a result, it is possible to prevent water remaining in the outlet buffer unit 50 and the anode off-gas outlet channel 60 from freezing and closing the gas channel when the temperature is below freezing.

  Further, in the anode-side separator 100 of the present embodiment, a plurality of protrusions that protrude from the inner wall surface toward the surface side of the anode on the inner wall surface facing the anode of the membrane electrode assembly in the water storage section 44e and that are in contact with the anode. A portion 44p is formed. And this projection part 44p has electroconductivity. Therefore, by using the anode-side separator 100 of this embodiment for a fuel cell, the internal resistance of the fuel cell can be reduced as compared with the case where the plurality of protrusions 44p are not formed on the inner wall surface of the water storage portion 44e. it can.

B. Variations:
Although the embodiments of the present invention have been described above, the present invention is not limited to such embodiments, and can be implemented in various modes without departing from the scope of the present invention. For example, the following modifications are possible.

B1. Modification 1:
In the anode separator 100 of the above embodiment, the serpentine type gas flow path is composed of the gas flow paths 40, 42, 44, 46, and 48, but the present invention is not limited to this. In the anode-side separator 100, the serpentine-type gas flow path may be formed so that hydrogen snakes along the surface of the anode of the membrane electrode assembly, and may have other configurations.

B2. Modification 2:
In the anode separator 100 of the above embodiment, the water storage part 44e is branched and connected from the gas flow path 44, and a part of the hydrogen flowing through the gas flow path 44 is branched and introduced. The invention is not limited to this. The water storage part 44e is formed so that a part of hydrogen flowing through the serpentine type gas flow paths 40, 42, 44, 46, and 48 is introduced and water contained in the introduced hydrogen can be temporarily stored. Just do it.

B3. Modification 3:
In the anode-side separator 100 of the above embodiment, the partition wall 52 has an inclined surface that is continuously inclined from the upper ends of the plurality of gas passages 48 to the upper end of the anode off-gas outlet passage 60. However, the present invention is not limited to this. The partition wall 52 only needs to isolate the water storage portion 44e and the outlet buffer portion 50 that are arranged adjacent to each other in the vertical direction. The shape of the partition wall 52, that is, the shape of the outlet buffer portion 50 and the water storage portion 44e, It is good also as a shape.

B4. Modification 4:
In the anode-side separator 100 of the above embodiment, a plurality of protrusions that protrude from the inner wall surface toward the surface side of the anode on the inner wall surface facing the anode of the membrane electrode assembly in the water storage section 44e and that are in contact with the anode. However, the present invention is not limited to this. In the water reservoir 44e, the plurality of protrusions 44p may be omitted.

B5: Modification 5:
In the above embodiment, the case where the configuration of the fuel cell separator of the present invention is applied to the anode separator laminated on the anode side of the membrane electrode assembly has been described. However, the present invention is not limited to this. The configuration of the separator for a fuel cell of the present invention may be applied to a cathode side separator laminated on the cathode side of the membrane electrode assembly.

DESCRIPTION OF SYMBOLS 100 ... Anode side separator 10 ... Hydrogen supply part 20 ... Hydrogen introduction flow path 30 ... Inlet buffer part 30p ... Protrusion part 40, 42, 44, 46, 48 ... Gas flow path 44e ... Reservoir part 44p ... Protrusion part 50 ... Outlet buffer 50p ... Projection 52 ... Partition 60 ... Anode off gas outlet flow path 70 ... Anode off gas discharge part

Claims (4)

A fuel cell separator,
A serpentine type gas flow path formed such that a reactive gas for power generation flows in a meandering manner along the surface of the electrode in a membrane electrode assembly formed by bonding electrodes to both surfaces of an electrolyte membrane;
An off-gas discharge part for discharging off-gas discharged from the electrode, penetrating in the thickness direction of the fuel cell separator;
A buffer portion connected to the end of the gas flow path and into which the off-gas discharged from the end of the gas flow path flows, the inner wall facing the electrode, from the inner wall to the surface of the electrode A buffer portion formed with a plurality of protrusions protruding toward the electrode and contacting the electrode;
An off-gas outlet flow path for leading the off-gas flowing into the buffer section to the off-gas discharge section;
A water storage section that is branched and connected from the gas flow path, partially introduces the reaction gas flowing through the gas flow path, and temporarily stores water contained in the introduced reaction gas. Thus, when the fuel cell separator is stacked on the membrane electrode assembly, the water stored is in contact with the electrode when the fuel cell separator is stacked on the membrane electrode assembly. A water reservoir formed in the
In a part facing the electrode, a partition wall that separates the water storage part and the buffer part,
A fuel cell separator. The fuel cell separator according to claim 1,
The gas flow path is
A first gas flow path for flowing the reaction gas in a first direction along a horizontal direction;
A second gas flow path connected to an end of the first gas flow path for flowing the reaction gas flowing in from the first gas flow path vertically downward;
A third gas flow path connected to an end of the second gas flow path for flowing the reaction gas flowing in from the second gas flow path in a second direction opposite to the first direction; ,
Including
The buffer unit is connected to a terminal end of the third gas flow path,
The water storage part is branched and connected from the first gas flow path, and a part of the reaction gas flowing through the first gas flow path is branched and introduced.
Fuel cell separator. The fuel cell separator according to claim 2, wherein
The terminal end of the third gas channel, the buffer unit, and the off-gas outlet channel are arranged side by side in the horizontal direction,
The upper end of the off-gas outlet channel is arranged vertically below the upper end of the third gas channel,
The partition has an inclined surface that is continuously inclined from the upper end of the third gas channel to the upper end of the off-gas outlet channel.
Fuel cell separator. A fuel cell separator according to any one of claims 1 to 3,
A plurality of projecting portions projecting from the inner wall surface toward the surface side of the electrode on the inner wall surface of the water storage portion facing the electrode and contacting the electrode, wherein the plurality of projecting portions having conductivity are provided. Formed,
Fuel cell separator.

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