JP5320927B2 - Fuel cell stack and fuel cell separator - Google Patents

Description

  The present invention relates to a fuel cell stack and a fuel cell separator.

Some conventional fuel cell stacks include an anode separator having a second protrusion that protrudes toward the electrolyte membrane and forms a reaction gas flow path, and a third protrusion that protrudes toward the cathode separator (for example, Patent Document 1). As a result, the third protrusion and the cathode separator are brought into contact with each other, and the displacement along the stacking direction of the fuel cell stack due to thermal expansion or the like is absorbed by bending the contact surface.
JP 2003-249242 A

  However, in the conventional fuel cell stack, the anode separator and the cathode separator are brought into surface contact. Therefore, even if the cathode separator receives a load from the anode separator due to displacement along the stacking direction of the fuel cell stack due to thermal expansion or the like, there is a problem that the bending moment generated in the cathode separator is small and the amount of displacement absorbed is small. It was.

  The present invention has been made paying attention to such conventional problems, and an object thereof is to increase the amount of displacement absorbed along the stacking direction of the fuel cell stack due to thermal expansion or the like.

  The present invention solves the above problems by the following means.

According to an aspect of the present invention , in a fuel cell stack in which a plurality of unit cells including an electrolyte membrane, electrodes provided on both front and back surfaces of the electrolyte membrane, and separators provided on each surface of the electrode are stacked, A separator having a groove-shaped first reaction gas flow path; a bottom surface inclined at a constant angle toward a central portion of the first reaction gas flow path; And a second plate having a second reactive gas flow channel in line contact, and a fuel cell stack having a flat bottom surface of the first reactive gas flow channel is provided.

  According to the present invention, since adjacent separators are brought into line contact, the bending moment generated in the separator can be increased, and the amount of displacement absorbed along the stacking direction of the fuel cell stack due to thermal expansion or the like can be increased.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(First embodiment)
A fuel cell system is a system that directly converts chemical energy of fuel into electrical energy. In a fuel cell system, a solid polymer electrolyte membrane (hereinafter referred to as “electrolyte membrane”) is sandwiched between an anode electrode (anode) and a cathode electrode (cathode), a fuel gas containing hydrogen is supplied to the anode electrode, and the cathode electrode is supplied. An oxidant gas containing oxygen is supplied. Thus, electric energy is extracted from the electrodes by utilizing the following electrochemical reaction that occurs on the surface of the anode electrode and the cathode electrode on the electrolyte membrane side.

Anode electrode: 2H ₂ → 4H ⁺ + 4e ⁻ (1)
Cathode electrode: 4H ⁺ + 4e ⁻ + O ₂ → 2H ₂ O (2)

  FIG. 1 is a perspective view of a fuel cell stack 10 used in a moving vehicle such as an automobile as such a fuel cell system.

  The fuel cell stack 10 includes a plurality of stacked single cells 1, a pair of current collecting plates 2a and 2b, a pair of insulating plates 3a and 3b, a pair of end plates 4a and 4b, and four tensions (not shown). And a nut 5 to be screwed onto the rod.

  The single cell 1 is a unit cell of a polymer electrolyte fuel cell that generates an electromotive force. The single cell 1 generates an electromotive voltage of about 1 volt. Details of the configuration of the single cell 1 will be described later.

The pair of current collector plates 2a and 2b are respectively arranged outside the plurality of unit cells 1 stacked. The current collecting plates 2a and 2b are formed of a gas impermeable conductive member, and are formed of dense carbon, for example. The current collector plates 2a and 2b include an output terminal 6 on a part of the upper side. The fuel cell stack 10 takes out the electron e ⁻ generated in each single cell 1 through the output terminal 6 and outputs it.

  The pair of insulating plates 3a and 3b are disposed outside the current collecting plates 2a and 2b, respectively. The insulating plates 3a and 3b are formed of an insulating member, for example, rubber.

  The pair of end plates 4a and 4b are disposed outside the insulating plates 3a and 3b, respectively. The end plates 4a and 4b are formed of a metallic material having rigidity, for example, steel.

  Of the pair of end plates 4a and 4b, one end plate 4a includes an inlet hole 41a and an outlet hole 41b for cooling water, an inlet hole 42a and an outlet hole 42b for anode gas, an inlet hole 43a and an outlet for cathode gas. A hole 43b is formed. The cooling water inlet hole 41a, the anode gas outlet hole 42b, and the cathode gas inlet hole 43a are formed on one end side (right side in the drawing) of the end plate 4a, and the cooling water outlet hole 41b, the anode gas inlet hole 42a, and the cathode gas are formed. The outlet hole 43b is formed on the other end side (left side in the figure).

  Here, as a method of supplying hydrogen as fuel gas to the anode gas inlet hole 42a, for example, a method of supplying hydrogen gas directly from a hydrogen storage device or a hydrogen-containing gas reformed by reforming a fuel containing hydrogen There is a way to supply. Examples of the hydrogen storage device include a high-pressure gas tank, a liquefied hydrogen tank, and a hydrogen storage alloy tank. As the fuel containing hydrogen, natural gas, methanol, gasoline or the like can be considered. Air is generally used as the oxidant gas supplied to the cathode gas inlet hole 43a.

  The nut 5 is screwed into male screw portions formed at both end portions of four tension rods (not shown) penetrating the inside of the fuel cell stack 10. The fuel cell stack 10 is tightened in the stacking direction by screwing and fastening the nut 5 to the tension rod. The tension rod is formed of a metal material having rigidity, for example, steel. The surface of the tension rod is insulated so as to prevent electrical shorting between the single cells.

  Hereinafter, the configuration of the single cell 1 will be described in detail with reference to FIG.

  FIG. 2 is a diagram showing a part of a cross section of the single cell 1.

  The single cell 1 includes a membrane electrode assembly (hereinafter referred to as “MEA”) 11 and separators 12 provided on both front and back surfaces.

  The MEA 11 includes an electrolyte membrane 11a, an anode electrode 11b, and a cathode electrode 11c. The MEA 11 has an anode electrode 11b on one surface of the electrolyte membrane 11a and a cathode electrode 11c on the other surface.

  The electrolyte membrane 11a is a proton-conductive ion exchange membrane formed of a fluorine-based resin. The electrolyte membrane 11a exhibits good electrical conductivity in a wet state. Therefore, in order to extract the performance of the electrolyte membrane 11a and improve the power generation efficiency, it is necessary to keep the moisture state of the electrolyte membrane 11a optimal. Therefore, in this embodiment, the anode gas and cathode gas introduced into the fuel cell stack 10 are humidified. In addition, it is necessary to use pure water as water for keeping the moisture state of the electrolyte membrane 11a optimal. This is because when water mixed with impurities is introduced into the fuel cell stack 10, the impurities accumulate in the electrolyte membrane 11a and the power generation efficiency decreases.

  The anode electrode 11b and the cathode electrode 11c are composed of a gas diffusion layer, a water repellent layer, and a catalyst layer. The gas diffusion layer is formed of a member having sufficient gas diffusibility and conductivity, and is formed of, for example, a carbon cloth woven with yarns made of carbon fibers. The water repellent layer is a layer containing polyethylene fluoroethylene and a carbon material. The catalyst layer is formed from carbon black particles on which platinum is supported.

  The separator 12 includes an anode separator 20 and a cathode separator 30.

  The anode separator 20 and the cathode separator 30 are separators made of metal. The anode separator 20 and the cathode separator 30 have seal portions 21 and 31 at outer edges, respectively, and the seal portions are bonded to each other with an adhesive. Note that welding may be performed instead of bonding.

  The anode separator 20 includes a plurality of ribs 22 projecting toward the anode electrode and having a top surface 22a in contact with the anode electrode 11b. A space formed between the ribs becomes the anode gas flow path 23. Further, the space on the back side of the rib 22 becomes a cooling water passage 24 through which cooling water for cooling the fuel cell stack 10 heated by power generation flows.

  Similarly, the cathode separator 30 includes a plurality of ribs 32 projecting toward the cathode electrode and having a top surface 32a in contact with the cathode electrode 11c. A cathode gas flow path 33 is formed between the ribs, and a cooling water flow path 34 is formed behind the rib 32. Is formed.

  The cooling water channels 24 and 34 provided in the adjacent anode separator 20 and the cathode separator 30 are formed so as to face each other, and one cooling water channel 40 is formed by the cooling water channels 24 and 34. The

  Here, the bottom surface portion (hereinafter referred to as “anode gas flow path bottom surface portion”) 23 a of the anode gas flow channel 23 is directed to the center of the bottom surface portion (hereinafter referred to as “cathode gas flow channel bottom surface portion”) 33 a of the cathode gas flow channel 33. The cross section is inclined at a constant angle, and the cross section is substantially triangular. On the other hand, the cathode gas flow path bottom surface portion 33a is flat. Thereby, when the anode separator 20 and the cathode separator 30 are overlapped, the anode gas flow channel bottom surface portion 23a and the cathode gas flow channel bottom surface portion 33a are in line contact.

  FIG. 3 is a diagram for explaining the operation and effect obtained by bringing the anode gas flow path bottom surface portion 23a and the cathode gas flow channel bottom surface portion 33a into line contact.

  In the fuel cell stack, a plurality of single cells 1 are fastened with a predetermined load (stacking load). Therefore, the force from the adjacent anode separator 20 acts on the cathode separator 30. On the other hand, reaction force from the adjacent cathode separator 30 acts on the anode separator 20.

  However, since the unit cell 1 expands due to heat generated by the electrode reaction during operation and humidified water contained in the anode gas and the cathode gas, a force along the stacking direction opposite to the stacking load acts.

  As a result, a predetermined stacking load cannot be secured, and the fuel cell stack 10 may be enlarged and displaced in the direction along the stacking direction.

  Therefore, conventionally, a disc spring or the like is provided at the end of the fuel cell stack 10 to cancel the force along the stacking direction opposite to the stacking load generated by the expansion of the single cell 1, and the displacement of the fuel cell stack 10. Was suppressed.

  On the other hand, in this embodiment, since the anode gas flow channel bottom surface portion 23a and the cathode gas flow channel bottom surface portion 33a are in line contact, the cathode gas flow channel bottom surface portion 33a is regarded as a beam that is simply supported at both ends. Compared with the case of surface contact, the magnitude of the load in the perpendicular direction acting on the beam can be increased.

  Thereby, since the bending moment of the beam is increased, the deflection of the cathode gas flow path bottom surface portion 33a can be increased. Moreover, since the magnitude of the reaction force is increased, the deflection of the anode gas flow path bottom surface portion 23a can be increased.

  In this way, by increasing the deflection of the anode gas flow channel bottom surface portion 23a and the cathode gas flow channel bottom surface portion 33a, the deflection is along the stacking direction opposite to the stacking load generated by the expansion of the single cell 1. Can cancel out the force. Accordingly, since a disc spring or the like is not necessary, the fuel cell stack 10 can be reduced in size. Further, the displacement of the fuel cell stack 10 due to the thermal expansion of the single cell 1 can be suppressed.

  According to the present embodiment described above, the anode gas flow path bottom surface portion 23a is inclined at a constant angle, so that the cross section has a substantially triangular shape. And when the single cell 1 was laminated | stacked, it was set as the structure which the anode gas flow path bottom face part 23a and the cathode gas flow path bottom face part 33a line-contact.

  As a result, the cathode gas flow channel bottom surface portion 33a is applied when a force in the stacking direction is applied to the fuel cell stack 10, as compared with the case where the anode gas flow channel bottom surface portion 23a and the cathode gas flow channel bottom surface portion 33a are brought into surface contact. The bending moment acting on can be increased. Therefore, the deflection of the cathode gas flow path bottom surface portion 33a can be increased. Therefore, when the single cell 1 is displaced in the stacking direction due to thermal expansion or the like, the amount of displacement that can be absorbed by the deflection of the cathode gas flow path bottom surface portion 33a can be increased.

  Further, the fuel cell stack 10 needs to tighten the single cell 1 with a predetermined load (stacking load). Therefore, conventionally, an elastic member such as a disc spring has been provided at one end of the fuel cell stack 10 in order to secure a stacking load when the fuel cell stack 10 is displaced in the stacking direction due to thermal expansion or the like.

  On the other hand, according to this embodiment, since the displacement in the stacking direction of the fuel cell stack 10 due to thermal expansion or the like can be absorbed by bending the separator, a conventional elastic member such as a disc spring becomes unnecessary. . Therefore, the fuel cell stack 10 can be reduced in size.

  In addition, since the anode gas flow path bottom surface portion 23a and the cathode gas flow path bottom surface portion 33a are in line contact, even if the contact portion is deformed by a stacking load, the contact area between the separators increases. Only changes. That is, the manner of contact between the separators changes only in the direction from line contact to surface contact, and only in the direction in which the contact resistance between the separators increases. Therefore, the separators 20 and 30 do not shift in the width direction when the single cell 1 is stacked or when the cell inner pressure varies during power generation.

  Further, the anode gas flow path bottom surface portion 23a was inclined at a constant angle toward the center of the cathode gas flow channel bottom surface portion 33a. For this reason, the central portion of the cathode gas flow channel bottom surface portion 33a and the anode gas flow channel bottom surface portion 23a are in line contact with each other, so that the bending moment acting on the cathode gas flow channel bottom surface portion 33a can be maximized.

  Further, since the anode gas flow path bottom surface portion 23a is simply inclined at a constant angle toward the center of the cathode gas flow channel bottom surface portion 33a, the bending work on the anode separator 20 is small. Therefore, the influence of work hardening on the anode separator 20 is small. Therefore, the deflection of the anode separator 20 can be increased.

(Second Embodiment)
Next, a second embodiment of the present invention will be described with reference to FIG. This embodiment is different from the first embodiment in that the center of the cathode gas flow path bottom surface portion 33a is expanded toward the cathode electrode. Hereinafter, the difference will be mainly described. In each of the following embodiments, the same reference numerals are used for portions that perform the same functions as those of the first embodiment described above, and repeated descriptions are omitted as appropriate.

  FIG. 4 is a view showing a part of a cross section of the unit cell 1 according to the present embodiment.

  As shown in FIG. 4, in the present embodiment, the central portion of the cathode gas flow path bottom surface portion 33a is inclined at a certain angle toward the cathode electrode side (lower side in the figure) and bulges. That is, since the back surface of the cathode gas flow path bottom surface portion 33a is recessed, the contact portion between the anode gas flow channel bottom surface portion 23a and the cathode gas flow channel bottom surface portion 33a is natural when the separators 20 and 30 are overlapped. To the central portion of the cathode gas flow path bottom surface portion 33a (self-alignment effect). For this reason, the central portion of the cathode gas flow path bottom surface portion 33a and the anode gas flow channel bottom surface portion 23a are in line contact, so that the bending moment acting on the cathode gas flow channel bottom surface portion 33a can be maximized.

(Third embodiment)
Next, a third embodiment of the present invention will be described with reference to FIG. This embodiment is different from the first embodiment in that a cut is made in the back surface (contact surface with the anode separator 20) of the central portion of the cathode gas flow path bottom surface portion 33a. Hereinafter, the difference will be mainly described.

  FIG. 5 is a view showing a part of a cross section of the unit cell 1 according to the present embodiment.

  As shown in FIG. 5, in the present embodiment, a groove-shaped cut 35 is made on the back surface of the central portion of the cathode gas flow path bottom surface portion 33a. Thereby, since the rigidity of the cathode gas flow path bottom surface portion 33a is lowered, the deflection of the cathode gas flow channel bottom surface portion 33a can be further increased.

  Further, since the notch 35 is formed on the back side of the cathode separator 30, the water generated by the reaction at the cathode electrode 11c does not accumulate in the notch 35, and good drainage can be ensured.

(Fourth embodiment)
Next, a fourth embodiment of the present invention will be described with reference to FIG. This embodiment is different from the first embodiment in that the plate thickness of the anode separator 20 is made thinner than the plate thickness of the cathode separator 30. Hereinafter, the difference will be mainly described.

  FIG. 6 is a view showing a part of a cross section of the unit cell 1 according to the present embodiment.

  As shown in FIG. 6, by reducing the plate thickness of the anode separator 20, the cross-sectional secondary moment of the anode separator 20 can be reduced. Thereby, the deflection of the anode gas flow path bottom surface portion 23a can be increased. Therefore, of the displacement in the stacking direction of the fuel cell stack 10 due to thermal expansion or the like of the single cell 1, the amount that can be absorbed by bending the separators 20 and 30 can be increased. In addition, by reducing the thickness of the anode separator 20, the stack height of the entire fuel cell stack when the single cells 1 are stacked can be reduced.

(Fifth embodiment)
Next, a fifth embodiment of the present invention will be described with reference to FIG. This embodiment is different in that the sealing method of the seal portions 21 and 31 of the anode separator 20 and the cathode separator 30 is changed from adhesion or welding to compression sealing. Hereinafter, the difference will be mainly described.

  FIG. 7 is a view showing a part of a cross section of the unit cell 1 according to the present embodiment.

  As shown in FIG. 7, in the present embodiment, the seal portions are compression-sealed by an elastic member 41 such as rubber. As a result, when the anode separator 20 and the cathode separator 30 are bent due to thermal expansion or the like, displacement in the width direction is also allowed, so that the overall bending amount can be increased.

  Note that the present invention is not limited to the above-described embodiment, and it is obvious that various modifications can be made within the scope of the technical idea.

  For example, when a force in the stacking direction is applied to the fuel cell stack 10, the bending moment acting on the cathode gas flow path bottom surface portion 33 a can be increased. Therefore, even if the flow path width of the cathode gas flow path 33 is shortened, the cathode The bending of the gas flow path bottom surface portion 33a can be ensured. Therefore, the channel widths of the anode gas channel 23 and the cathode gas channel 33 may be shortened.

  In order to keep the contact area between the anode gas passage 23 and the electrode 11b equal to the area before the anode gas passage 23 is shortened when the passage width of the anode gas passage 23 is shortened. Therefore, it is necessary to increase the number of anode gas passages 23, and therefore it is necessary to shorten the width of the ribs 22 as well.

  Here, when the width of the ribs 22 can be shortened, among the reaction gases flowing through the adjacent anode gas flow paths 23 via the ribs 22, the adjacent anodes pass through the gas diffusion layer of the anode electrode 11b below the ribs. The ratio of the reaction gas that moves to the gas flow path 23 increases. Therefore, it becomes easy to supply the reactive gas also to the anode electrode 11b under the rib, so that the power generation performance can be improved. The same applies when the channel width of the cathode gas channel 33 is shortened.

  Further, in the above embodiment, the anode gas flow channel bottom surface portion 23a of the anode separator 20 is in line contact with the cathode separator 30 as a substantially triangular shape. However, the cathode gas flow path bottom surface portion 33a of the cathode separator 30 may have a substantially triangular shape and may be in line contact with the anode separator 20.

It is a perspective view of a fuel cell stack. It is a figure which shows a part of cross section of the single cell by 1st Embodiment. It is a figure explaining the effect by having line-contacted the anode gas flow path bottom face part and the cathode gas flow path bottom face part. It is a figure which shows a part of cross section of the single cell by 2nd Embodiment. It is a figure which shows a part of cross section of the single cell by 3rd Embodiment. It is a figure which shows a part of cross section of the single cell by 4th Embodiment. It is a figure which shows a part of cross section of the single cell by 5th Embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Single cell 10 Fuel cell stack 11a Electrolyte membrane 11b Anode electrode 11c Cathode electrode 12 Separator 20 Anode separator (2nd plate)
21 Compression seal 23 Anode gas flow path (second reactive gas flow path)
23a Anode gas channel bottom surface (bottom surface)
30 Cathode separator (first plate)
31 Compression seal 33 Cathode gas flow path (first reaction gas flow path)
33a Cathode gas flow path bottom surface (bottom surface)
35 Cutting (cutting part)

Claims (16)

An electrolyte membrane;
Electrodes provided on both front and back surfaces of the electrolyte membrane;
A separator provided on each surface of the electrode;
A fuel cell stack in which a plurality of single cells including
The separator is
A first plate having a groove-shaped first reaction gas flow path;
A second plate having a second reaction gas flow path whose bottom surface is inclined at a constant angle toward the center of the first reaction gas flow path and is in line contact with the back surface of the first reaction gas flow path;
With
A bottom surface of the first reaction gas channel is flat;
A fuel cell stack characterized by that. An electrolyte membrane;
Electrodes provided on both front and back surfaces of the electrolyte membrane;
A separator provided on each surface of the electrode;
A fuel cell stack in which a plurality of single cells including
The separator is
A first plate having a groove-shaped first reaction gas flow path;
A second plate having a second reaction gas flow path whose bottom surface is inclined at a constant angle toward the center of the first reaction gas flow path and is in line contact with the back surface of the first reaction gas flow path;
With
The bottom surface of the first reactive gas flow channel is bulged at the center toward the electrode side to which the reactive gas flowing through the first reactive gas flow channel is supplied.
Fuel cell stack that be characterized in that. The first plate has a groove-shaped cut portion that lowers the rigidity of the first plate at the center of the back surface of the first reaction gas channel.
The fuel cell stack according to claim 1 or 2 , wherein An electrolyte membrane;
Electrodes provided on both front and back surfaces of the electrolyte membrane;
A separator provided on each surface of the electrode;
A fuel cell stack in which a plurality of single cells including
The separator is
A first plate having a groove-shaped first reaction gas flow path;
A second plate having a second reaction gas flow path whose bottom surface is inclined at a constant angle toward the center of the first reaction gas flow path and is in line contact with the back surface of the first reaction gas flow path;
With
The first plate has a groove-shaped cut portion that lowers the rigidity of the first plate at the center of the back surface of the first reaction gas channel.
Fuel cell stack that be characterized in that. The plate thickness of the second plate is thinner than the plate thickness of the first plate,
The fuel cell stack according to any one of claims 1 to 4, wherein An electrolyte membrane;
Electrodes provided on both front and back surfaces of the electrolyte membrane;
A separator provided on each surface of the electrode;
A fuel cell stack in which a plurality of single cells including
The separator is
A first plate having a groove-shaped first reaction gas flow path;
A second plate having a second reaction gas flow path whose bottom surface is inclined at a constant angle toward the center of the first reaction gas flow path and is in line contact with the back surface of the first reaction gas flow path;
With
The plate thickness of the second plate is thinner than the plate thickness of the first plate,
Fuel cell stack that be characterized in that. The first plate and the second plate have compression seal portions that suppress gas leakage by elastic members at the outer edge portions,
The fuel cell stack according to any one of claims 1 to 6, wherein: An electrolyte membrane;
Electrodes provided on both front and back surfaces of the electrolyte membrane;
A separator provided on each surface of the electrode;
A fuel cell stack in which a plurality of single cells including
The separator is
A first plate having a groove-shaped first reaction gas flow path;
A second plate having a second reaction gas flow path whose bottom surface is inclined at a constant angle toward the center of the first reaction gas flow path and is in line contact with the back surface of the first reaction gas flow path;
With
The first plate and the second plate have compression seal portions that suppress gas leakage by elastic members at the outer edge portions,
A fuel cell stack characterized by that. A fuel cell separator comprising a first plate and a second plate adjacent thereto,
The first plate has a groove-shaped first reaction gas flow path,
The second plate has a second reaction gas flow channel whose bottom surface is inclined at a constant angle toward the center of the first reaction gas flow channel and is in line contact with the back surface of the first reaction gas flow channel. And
A bottom surface of the first reaction gas channel is flat;
A fuel cell separator. A fuel cell separator comprising a first plate and a second plate adjacent thereto,
The first plate has a groove-shaped first reaction gas flow path,
The second plate has a second reaction gas flow channel whose bottom surface is inclined at a constant angle toward the center of the first reaction gas flow channel and is in line contact with the back surface of the first reaction gas flow channel. And
The bottom surface of the first reactive gas flow channel is bulged at the center toward the electrode side to which the reactive gas flowing through the first reactive gas flow channel is supplied.
A fuel cell separator. The first plate has a groove-shaped cut portion that lowers the rigidity of the first plate at the center of the back surface of the first reaction gas channel.
11. The fuel cell separator according to claim 9, wherein the fuel cell separator is a fuel cell separator. A fuel cell separator comprising a first plate and a second plate adjacent thereto,
The first plate is
A groove-shaped first reaction gas flow path;
A groove-shaped notch formed at the center of the back surface of the first reactive gas flow path to lower the rigidity of the first plate;
Including
The second plate has a second reaction gas channel whose bottom surface portion is inclined at a constant angle toward the center of the first reaction gas channel and is in line contact with the back surface of the first reaction gas channel. ,
A fuel cell separator. The plate thickness of the second plate is thinner than the plate thickness of the first plate,
The fuel cell separator according to any one of claims 9 to 12, wherein the separator is a fuel cell separator. A fuel cell separator comprising a first plate and a second plate adjacent thereto,
The first plate has a groove-shaped first reaction gas flow path,
The second plate has a second reaction gas flow channel whose bottom surface is inclined at a constant angle toward the center of the first reaction gas flow channel and is in line contact with the back surface of the first reaction gas flow channel. And
The plate thickness of the second plate is thinner than the plate thickness of the first plate,
A fuel cell separator. The first plate and the second plate have compression seal portions that suppress gas leakage by elastic members at the outer edge portions,
The fuel cell separator according to any one of claims 9 to 14, wherein: A fuel cell separator comprising a first plate and a second plate adjacent thereto,
The first plate has a groove-shaped first reaction gas flow path,
The second plate has a second reaction gas flow channel whose bottom surface is inclined at a constant angle toward the center of the first reaction gas flow channel and is in line contact with the back surface of the first reaction gas flow channel. And
The first plate and the second plate have compression seal portions that suppress gas leakage by elastic members at the outer edge portions,
A fuel cell separator.

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