JP2020173973A - Fuel cell separator - Google Patents

Abstract

To provide a fuel cell separator with improved sealing properties.SOLUTION: A fuel cell separator includes a flat base, a bead that protrudes from a base to one side and extends in a first direction, and the standing wall portion that rises from the base to the one side, faces the bead, and extends in the first direction while meandering.SELECTED DRAWING: Figure 5

Description

The present invention relates to a separator for a fuel cell.

A fuel cell is configured by stacking a plurality of single cells. The separator in each single cell is provided with a bead that seals the reaction gas and the refrigerant (see, for example, Patent Document 1).

JP-A-2016-048620

When a plurality of single cells are fastened, a compressive load acts on the beads of the separator in the stacking direction. If the bead is easily deformed by such a compressive load, the sealing property may be deteriorated.

An object of the present invention is to provide a separator for a fuel cell having improved sealing performance.

The object is a flat base, a bead that protrudes from the base to one side and extends along the first direction, and a bead that rises from the base to the one side, faces the bead, and meanders in the first direction. This can be achieved by a separator for a fuel cell, which comprises a standing wall portion extending along the line.

An outer edge extending along the first direction may be provided, and the standing wall portion may be located between the bead and the outer edge.

The standing wall portion may extend in a zigzag shape along the first direction.

The standing wall portion may extend in a wavy shape along the first direction.

A collar portion protruding from the standing wall portion to the side opposite to the bead may be provided.

The bead may extend linearly along the first direction.

The bead may meander and extend along the first direction.

According to the present invention, it is possible to provide a separator for a fuel cell having improved sealing performance.

FIG. 1 is a perspective view of a fuel cell. FIG. 2 is a plan view of a single cell anode separator. FIG. 3 is a cross-sectional view showing a part of the cell laminate at a portion corresponding to the space between A and A in FIG. FIG. 4 is a partially enlarged perspective view of the separator showing the periphery of the outer peripheral bead. FIG. 5 is a partially enlarged plan view of the separator showing the periphery of the outer peripheral bead as seen from the + Z direction side. FIG. 6 is an explanatory diagram of a separator of a comparative example. .. FIG. 7 is an explanatory diagram of a separator of a comparative example. FIG. 8 is a partially enlarged plan view of the separator which is the first modification. FIG. 9 is a partially enlarged plan view of the separator which is the second modification. FIG. 10 is a partially enlarged plan view of the separator which is a third modification.

[Outline configuration of fuel cell]
FIG. 1 is a perspective view of the fuel cell 100. FIG. 1 shows the X, Y, and Z directions that are orthogonal to each other. The fuel cell 100 can be used, for example, as a power source for an electric vehicle. As shown in FIG. 1, the fuel cell 100 includes a cell laminate 11, terminal plates 12a and 12b, insulating plates 13a and 13b, and end plates 14a and 14b. In the cell laminate 11, a plurality of single cells 10 are laminated in the Z direction. The single cell 10 is a polymer electrolyte fuel cell that generates electricity by being supplied with a fuel gas (for example, hydrogen) and an oxidant gas (for example, air) as reaction gases.

The terminal plates 12a and 12b are arranged at both ends of the cell laminate 11 in the stacking direction. The insulating plates 13a and 13b are arranged outside the terminal plates 12a and 12b in the stacking direction of the cell laminate 11. The end plates 14a and 14b are arranged outside the insulating plates 13a and 13b in the stacking direction of the cell laminate 11. The terminal plates 12a and 12b are formed of a conductive member such as dense carbon or copper, and are used to extract the generated power of the single cell 10. The insulating plates 13a and 13b are formed of an insulating member such as rubber or resin, and insulate between the terminal plates 12a and 12b and the end plates 14a and 14b. The end plates 14a and 14b fasten the cell laminate 11, the terminal plates 12a and 12b, and the insulating plates 13a and 13b.

The single cell 10, the terminal plate 12a, the insulating plate 13a, and the end plate 14a each have a plurality of manifold holes, and the plurality of manifold holes are communicated with each other to form a plurality of manifolds 20 to 25. .. The manifold 20 is used to supply fuel gas to the cell laminate 11, and the manifold 21 is used to discharge fuel gas from the cell laminate 11. The manifold 22 is used to supply the oxidant gas to the cell laminate 11, and the manifold 23 is used to discharge the oxidant gas from the cell laminate 11. The manifold 24 is used to supply a refrigerant (for example, cooling water) to the cell laminate 11, and the manifold 25 is used to discharge the refrigerant from the cell laminate 11.

FIG. 2 is a plan view of the anode separator 37 of the single cell 10. FIG. 3 is a cross-sectional view showing a part of the cell laminate 11 at a portion corresponding to the space between A and A in FIG. As shown in FIG. 2, the anode separator (hereinafter, simply referred to as a separator) 37 has a substantially rectangular shape with the X direction and the Y direction as the lateral direction and the longitudinal direction, respectively, and has edges 372 to 375 defining the outer edge. Have. The edges 372 and 373 are substantially parallel in the Y direction and separated in the X direction. The edges 374 and 375 are substantially parallel in the X direction and separated in the Y direction. Further, the separator 37 is formed with manifold holes 50 to 55 for defining each of the manifolds 20 to 25. Manifold holes 52, 54, and 51 are provided along the edge 374. Manifold holes 50, 55, and 53 are provided along the edge 375. A plurality of flow path ribs 42 extending in the Y direction and arranged at predetermined intervals in the X direction are formed between the manifold holes 50, 55, and 53 and the manifold holes 52, 54, and 51. .. Further, the separator 37 is provided with manifold beads 44a to 44f and an outer peripheral bead 44g in order to prevent leakage of the refrigerant and the reaction gas. The manifold beads 44a to 44f surround the manifold holes 50 to 55, respectively. The outer peripheral bead 44g surrounds the gas manifold holes 50 to 53 and the plurality of flow path ribs 42 so that the manifold holes 54 and 55 are located on the outside, and extends along the edges 372 to 375. Further, the separator 37 is provided with a standing wall portion 46 and a flange portion 48 along the edges 372 to 375, which are outside the outer peripheral bead 44 g. The vertical wall portion 46 and the flange portion 48 will be described in detail later.

As shown in FIG. 3, the single cell 10 includes a membrane electrode gas diffusion layer assembly (hereinafter referred to as MEGA (Membrane Electrode Gas diffusion layer assembly)) 36, a frame-shaped insulating frame 39 surrounding the MEGA 36, the MEGA 36, and the MEGA 36. A separator 37 facing the insulating frame 39 and a cathode separator (hereinafter, simply referred to as a separator) 38 facing the MEGA 36 and the separator 37 on the opposite side of the insulating frame 39 are provided. The separators 37 and 38 are made of a member having gas blocking property and electron conductivity, and are made of a metal member such as press-molded stainless steel. The insulating frame 39 is formed of an elastic resin member such as rubber or an elastomer resin, but may be formed of a non-elastic insulating member.

As shown in FIG. 3, the separator 37 has a flat base portion 371 substantially parallel to the XY plane, a plurality of flow path ribs 42 protruding in the + Z direction from the base portion 371, an outer peripheral bead 44 g, and an outer peripheral bead 44 g. Includes a vertical wall portion 46 and a flange portion 48 that extend. The fuel gas flowing through the manifold 20 shown in FIG. 1 flows from the manifold hole 50 between the adjacent flow path rib 42 and the MEGA 36 facing the manifold hole 50, and is discharged from the manifold 21 through the manifold hole 51.

The outer peripheral bead 44g of the separator 37 protrudes from the base portion 371 in the + Z direction so that a reaction force can be secured against a compressive load in the Z direction. The outer peripheral bead 44g of the separator 37 is pressed against the insulating frame 39 facing the separator 37 via a rubber gasket 70 which is an elastic member. The manifold beads 44a to 44f shown in FIG. 2 are also pressed against the insulating frame 39 via a gasket (not shown).

The outer bead 44g includes side portions 441 and 442 and a top portion 443. The side portions 441 and 442 project toward the + Z direction so as to be inclined with respect to the base portion 371. The top portion 443 is substantially parallel to the base portion 371 and is located on the + Z direction side with respect to the base portion 371. The side portion 441 is located closer to the edge 372 than the side portion 442. The vertical wall portion 46 is inclined with respect to the base portion 371 so as to project from the base portion 371 toward the + Z direction. The vertical wall portion 46 will be described in detail later.

The collar portion 48 protrudes from the vertical wall portion 46 on the side opposite to the outer peripheral bead 44 g, that is, on the outside of the separator 37 so as to be substantially parallel to the top portion 443 and the base portion 371, and is located on the + Z direction side from the base portion 371. ing. The flange portion 48 has substantially the same protrusion height in the + Z direction as the top portion 443, but is not in contact with the insulating frame 39, and a gasket 70 is provided between the flange portion 48 and the insulating frame 39. Not limited to this.

The separator 38 includes a flat base portion 381 substantially parallel to the XY plane, a plurality of flow path ribs 43 protruding in the −Z direction from the base portion 381, an outer peripheral bead 45 g, and a standing wall portion 47 extending along 45 g. Including. The base 381 of the separator 38 is in contact with the base 371 of the separator 37 facing the separator 38. The plurality of flow path ribs 43 of the separator 38 extend in the Y direction and are arranged at a predetermined interval in the X direction, and face the plurality of flow path ribs 42 of the separator 37 facing the separator 38 in the Z direction. There is. The oxidant gas flowing through the manifold 22 shown in FIG. 1 flows from the manifold hole 52 between the adjacent flow path rib 43 and the MEGA 36 facing the flow path rib 43, and is discharged from the manifold 23 through the manifold hole 53. The refrigerant flowing through the manifold 24 shown in FIG. 1 flows from the manifold holes 54 between the flow path ribs 42 and 43 facing each other, and is discharged from the manifold 25 through the manifold holes 55.

The outer peripheral bead 45 g of the separator 38 projects from the base portion 381 in the −Z direction so that a reaction force can be secured against a compressive load in the Z direction. The outer peripheral bead 44g of the separator 37 faces the outer peripheral bead 45g of the separator 38 facing the separator 37 in the Z direction. The outer peripheral bead 45 g of the separator 38 extends along the outer peripheral edge of the separator 38 in the same manner as the outer peripheral bead 44 g of the separator 37. The outer peripheral bead 45 g of the separator 38 is pressed against the insulating frame 39 facing the separator 38 via a rubber gasket 70 which is an elastic member.

The outer bead 45g includes side portions 451 and 452 and a top portion 453. The side portions 451 and 452 project toward the −Z direction so as to be inclined with respect to the base portion 381. The top portion 453 is substantially parallel to the base portion 381 and is located on the −Z direction side with respect to the base portion 381. The side portion 451 is located closer to the edge 382 than the side portion 452. The vertical wall portion 47 is inclined with respect to the base portion 381 so as to project from the base portion 381 in the −Z direction.

The flange portion 49 protrudes from the vertical wall portion 47 on the side opposite to the outer peripheral bead 45 g, that is, on the outside of the separator 38 so as to be substantially parallel to the top portion 453 and the base portion 381, and is located on the −Z direction side with respect to the base portion 381. are doing. The flange portion 49 has substantially the same protrusion height in the −Z direction as the top portion 453, but is not in contact with the insulating frame 39, and a gasket 70 is provided between the flange portion 49 and the insulating frame 39. Not limited to this, but not limited to this.

The separator 38 and the insulating frame 39 are provided with a plurality of manifold holes, similarly to the manifold holes 50 to 55 of the separator 37. Further, the separator 38 is provided with a plurality of sealing portions as in the manifold beads 44a to 44f and the outer peripheral bead 44g of the separator 37. The separators 37 and 38 are joined around the manifold beads 44a, 44b, 44c, and 44d and around the outer bead 44g. The separators 37 and 38 are joined by, for example, laser welding, but may be joined by other methods such as arc welding or thermocompression bonding. Further, in FIG. 3, the shapes of the separators 37 and 38 are asymmetrical with respect to the XY plane, but the shape is not limited to this, and for example, the outer peripheral beads 44 g and 45 g, the standing wall portions 46 and 47, the flange portion 48, and the flange portion 48 Each of the 49s may have a symmetrical shape.

The MEGA 36 includes a membrane electrode assembly (hereinafter referred to as MEA (Membrane Electrode Assembly)) 35, an anode gas diffusion layer (hereinafter simply referred to as a diffusion layer) 33, and a cathode gas diffusion layer (hereinafter simply referred to as a diffusion layer). ) 34 and. The MEA35 exposes the electrolyte membrane 30, the anode catalyst layer (hereinafter, simply referred to as the catalyst layer) 31 provided on the entire surface of one surface of the electrolyte membrane 30, and the outer peripheral edge portion 30a of the electrolyte membrane 30 on the other surface. A cathode catalyst layer (hereinafter, simply referred to as a catalyst layer) 32 provided so as to be provided is provided. The insulating frame 39 is joined to the outer peripheral edge portion 30a of the electrolyte membrane 30 by, for example, an adhesive.

The electrolyte membrane 30 is a solid polymer membrane formed of a fluorine-based resin material or a carbon-based resin material having a sulfonic acid group, and has good proton conductivity in a wet state. The catalyst layers 31 and 32 are carbon particles (carbon black, etc.) carrying a catalyst (platinum or platinum-cobalt alloy, etc.) for advancing the electrochemical reaction, and a solid polymer having a sulfonic acid group, which are good in a wet state. Includes ionomers with various proton conductivity. The diffusion layers 33 and 34 are formed of a member having gas permeability and electron conductivity, and are formed of a porous carbon member such as carbon cloth or carbon paper.

[Detailed configuration of the vertical wall portion 46]
FIG. 4 is a partially enlarged perspective view of the separator 37 showing the periphery of the vertical wall portion 46. FIG. 5 is a partially enlarged plan view of the separator 37 showing the periphery of the vertical wall portion 46 as viewed from the + Z direction side. FIG. 5 corresponds to a plan view seen from the side on which the vertical wall portion 46 protrudes and from a direction perpendicular to the surface of the base portion 371. 4 and 5 show a part of the vertical wall portion 46 and the outer peripheral bead 44 g extending along the edge 372.

The vertical wall portion 46 faces the side portion 441 of the outer peripheral bead 44 g, meanders in a zigzag shape, and extends along the + Y direction. The + Y direction is an example of the first direction. The vertical wall portion 46 extends with a constant amplitude and wavelength. Specifically, the standing wall portion 46 includes a plurality of surfaces 461 and 462 on the side facing the side portion 441. The surface 461 approaches the side portion 441 as it advances in the + Y direction. The surface 462 separates from the side portion 441 as it advances in the + Y direction. The surfaces 461 and 462 are provided so as to alternate in the Y direction.

[Force propagation direction in this embodiment]
In the fuel cell 100, a separator 37, an insulating frame 39, a MEGA 36, and the like are laminated, and these members are fastened so that a compressive load acts in the Z direction. When a compressive load acts on the outer peripheral bead 44g of the separator 37 in the Z direction, a force that spreads in the −X direction acts on the side portion 441, in other words, the inclination angle of the side portion 441 with respect to the base portion 371 becomes smaller. A force that tries to deform acts on it. The propagation of force in the process of such deformation of the side portion 441 will be conceptually described. FIG. 5 shows the directions P10 to P13, P12a, P20 to P23, and P22a in which the force propagates when a compressive load is applied to the outer peripheral bead 44 g in the Z direction. The directions P10 to P13 and the directions P20 to P23 are shown as typical examples of the propagation paths of the forces acting at positions separated in the Y direction. Further, the directions P10 to P13 and P20 to 23 coincide with the −X direction in a plan view.

With the passage of a minute time after the compressive load acts on the outer bead 44 g, the force propagates in the order of directions P10, P11, P12 and P12a, and P13, and the directions P20, P21, P22 and P22a propagate at the same timing as these propagations. , And P23 in that order. First, the forces propagating in the directions P10, P11, P12 and P12a, and P13 will be described. When a compressive load in the Z direction acts on the outer bead 44 g, the force propagates in the direction P10 at the side portion 441. Next, at the base portion 371 between the side portion 441 and the standing wall portion 46, the force propagates from the direction P10 to the direction P11. Next, on the surface 461 of the vertical wall portion 46, the force propagates from the direction P11 to the direction P12 and also propagates to the direction P12a. The direction P12a is the side of the surface 462 that is adjacent to the surface 461 along the surface 461 so as to face each other. Next, at the collar 48, the force propagates from the direction P12 to the direction P13.

Next, the forces propagating in the directions P20, P21, P22 and P22a, and P23 will be described. When a compressive load in the Z direction acts on the outer bead 44 g, the force propagates in the direction P20 at the side portion 441. Next, at the base portion 371 between the side portion 441 and the standing wall portion 46, the force propagates from the direction P20 to the direction P21. Next, on the surface 461 of the vertical wall portion 46, the force propagates from the direction P21 to the direction P22 and also propagates to the direction P22a. The direction P22a is the side of the surface 461 adjacent to the surface 462 along the surface 462 so as to face each other. Next, at the collar 48, the force propagates from the direction P22 to the direction P23.

Here, the directions P12a and P22a face each other. Therefore, a part of the force propagating in the direction P12a and a part of the force propagating in the direction P22a cancel each other out. Specifically, the Y-direction component of the force propagating in the direction P12a and the Y-direction component of the force propagating in the direction P22a cancel each other out. As a result, the force propagating in the direction P12 on the surface 461 and the force propagating in the direction P22 on the surface 462 are reduced. Therefore, the force propagating in each of the directions P13 and P23 is also reduced. In this way, the force propagating from the side 441 to the edge 372 is ultimately reduced. That is, when a compressive load is applied to the outer peripheral bead 44 g in the Z direction, the deformation of the side portion 441 is suppressed.

[Comparison example]
Next, a comparative example will be described. In the comparative example, the same components as those in the present embodiment are designated by the same reference numerals, so that duplicate description will be omitted. 6 and 7 are explanatory views of the separator 37x of the comparative example. 6 and 7 correspond to FIGS. 4 and 5, respectively. The vertical wall portion 46x of the separator 37x extends linearly along the Y direction.

FIG. 7 also shows the directions P10 to P13 and P20 to P23 in which the force propagates as in FIG. In the comparative example, in the vertical wall portion 46x, the force propagates in the directions P12 and P22, and the force does not propagate in the directions P12a and P22a as in this embodiment. This is because the vertical wall portion 46x extends parallel to the Y direction. Therefore, in the comparative example, a part of the propagating force is not offset as in the present embodiment, and the force propagating in the direction P12 at the vertical wall portion 46x propagates in the direction P12 on the surface 461 of the vertical wall portion 46 of the present embodiment. Similarly, the force propagating in the direction P22 at the standing wall portion 46x is larger than the force propagating in the direction P22 on the surface 462 of the standing wall portion 46 of the present embodiment. Therefore, the respective forces propagating in the directions P13 and P23 at the collar 48 in the comparative example are larger than the respective forces propagating in the directions P13 and P23 at the collar 48 in this embodiment.

As described above, in the comparative example, since a large force propagates from the side portion 441 to the edge 372, the amount of deformation of the side portion 441 may increase. Therefore, the side portion 441 may be easily deformed with respect to the compressive load, and the sealing property between the top portion 443 of the outer peripheral bead 44g and the insulating frame 39 via the gasket 70 described above may be deteriorated. In this embodiment, the deformation of the side portion 441 when a compressive load is applied to the outer peripheral bead 44 g in the Z direction is suppressed, so that the sealing property is improved.

When a compressive load acts on the outer peripheral bead 44 g in the Z direction, a force acts on the side portion 442 in the + X direction. Here, as shown in FIG. 3, a plurality of flow path ribs 42 are formed in the central portion of the separator 37, and the side portions 442 are provided on the side of the plurality of flow path ribs 42. Due to the plurality of flow path ribs 42, the central portion of the separator 37 is more rigid than the edge 372 side. Here, when the compressive load in the Z direction acts on the outer peripheral bead 44 g of the separator 37, the compressive load in the Z direction actually acts not only on the outer peripheral bead 44 g but also on the plurality of flow path ribs 42. Therefore, it is considered that the compressive load acting on the side portion 442 facing the plurality of flow path ribs 42 whose rigidity is ensured is smaller than the compressive load acting on the side portion 441 facing the edge 372. Therefore, the deformation of the side portion 442 is suppressed, and the sealing property is ensured.

Further, as shown in FIG. 2, the standing wall portion 46 is provided along not only the edge 372 but also the edges 373 to 375. Therefore, the sealing performance of the manifold beads 44e and 44f is also ensured. Further, as shown in FIG. 3, the separator 38 is also provided with a vertical wall portion 47, and the vertical wall portion 47 also meanders like the vertical wall portion 46. Therefore, the amount of deformation of the side portion 451 of the outer peripheral bead 45 g is suppressed, and the sealing property of the outer peripheral bead 45 g is improved.

The vertical wall portion 46 has a constant amplitude and wavelength and meanders in a zigzag shape, but the present invention is not limited to this, and the standing wall portion 46 may have a zigzag shape in which the amplitude changes in the middle, or a zigzag shape in which the wavelength changes in the middle. There may be. The same applies to the vertical wall portion 47.

[First modification]
Next, separators related to a plurality of modified examples will be described. FIG. 8 is a partially enlarged plan view of the separator 37a, which is a first modification. FIG. 8 corresponds to FIG. The vertical wall portion 46a of the separator 37a extends along the Y direction while meandering in a wavy shape. Specifically, the standing wall portion 46a, the amplitude and the wavelength are substantially constant and extend in a wavy shape. "Wavy" means a smoothly curved shape such as a sine wave. Specifically, the standing wall portion 46a includes a plurality of surfaces 461a and 462a on the side facing the side portion 441. The surface 461a approaches the side portion 441 as it advances in the + Y direction. The surface 462a separates from the side portion 441 as it advances in the + Y direction. The surfaces 461a and 462a are provided so as to alternately repeat in the Y direction.

Also in the first modified example, when a compressive load is applied to the outer peripheral bead 44 g in the Z direction as in the present embodiment shown in FIG. 5, a part of the force propagating to each of the surfaces 461a and 462a facing each other is partially generated. Since they are offset, the deformation of the side portion 441 is suppressed and the sealing property is ensured.

[Second modification]
FIG. 9 is a partially enlarged plan view of the separator 37b, which is a second modification. FIG. 9 corresponds to FIG. The outer peripheral bead 44 gb of the separator 37b meanders and extends in a wavy shape. All of the side portions 441b and 442b and the top portion 443b of the outer peripheral bead 44gb meander. Since the outer peripheral bead 44 gb meanders in this way, rigidity is ensured, and a reaction force when a compressive load in the Z direction acts on the outer bead 44 gb is secured. As described above, since the standing wall portion 46 is provided along the outer peripheral bead 44 gb where the rigidity is ensured, the sealing property of the outer peripheral bead 44 gb is further improved. The outer peripheral bead 44 gb may meander in a zigzag shape.

[Third variant]
FIG. 10 is a partially enlarged plan view of the separator 37c, which is a third modification. FIG. 10 corresponds to FIG. The separator 37c is not provided with a flange portion 48 continuous with the standing wall portion 46. Therefore, only the standing wall portion 46 stands up in the + Z direction, and the edge 372c of the separator 37c corresponds to the edge of the standing wall portion 46 and faces the + Z direction side. As described above, since the separator 37c is not provided with the flange portion 48 extending in the XY plane direction, the size of the separator 37c in the XY plane direction is suppressed. Further, as in the present embodiment described above, since a part of the force propagating to each of the surfaces 461 and 462 facing each other is canceled out, the deformation of the side portion 441 is suppressed and the sealing property is ensured.

Since the separator 37c is not provided with the flange portion 48, the size of the separator 37c in the XY plane direction is smaller than that of the separators 37 to 37b described above. Therefore, the material cost of the separator 37c can be suppressed.

Further, the separator 38 shown in FIG. 3 may also be configured so that the flange portion 49 is not provided. By using such a separator, it is possible to manufacture a fuel cell stack in which the sealing property is ensured while suppressing the size in the plane direction perpendicular to the stacking direction of the single cells. In addition, also in the 3rd modification, the wavy standing wall portion 46a may be adopted instead of the standing wall portion 46.

The inclination angle of the vertical wall portion 46 with respect to the base portion 371 and the height in the Z direction are set so that the edge 372c corresponding to the edge of the vertical wall portion 46 of the separator 37c does not come into contact with the insulating frame 39 facing the separator 37c. It is preferable to do so.

Although the examples of the present invention have been described in detail above, the present invention is not limited to such specific examples, and various modifications and modifications are made within the scope of the gist of the present invention described in the claims. It can be changed.

100 Fuel cell 37, 37a, 37b, 37c Anode separator (separator for fuel cell)
371 Base 372 Edge 44 Outer bead (bead)
46 Standing wall 48 Collar

Claims (7)

With a flat base,
A bead that protrudes unilaterally from the base and extends along the first direction.
A separator for a fuel cell, comprising a standing wall portion that rises from the base portion to the one side, faces the bead, and extends along the first direction while meandering. With an outer edge extending along the first direction
The separator for a fuel cell according to claim 1, wherein the standing wall portion is located between the bead and the outer edge. The separator for a fuel cell according to claim 1 or 2, wherein the standing wall portion extends in a zigzag shape along the first direction. The separator for a fuel cell according to claim 1 or 2, wherein the standing wall portion extends in a wavy shape along the first direction. The separator for a fuel cell according to any one of claims 1 to 4, further comprising a flange portion protruding from the standing wall portion to the side opposite to the bead. The separator for a fuel cell according to any one of claims 1 to 5, wherein the bead extends linearly along the first direction. The separator for a fuel cell according to any one of claims 1 to 5, wherein the bead extends while meandering along the first direction.

Images