End Plate

Abstract

The present invention provides an endplate which can be suppressed in deformation due to temperature changes without deteriorating the effectiveness of using a metal material and a resin material. An endplate according to the present invention is provided with: a plate main body that is formed of a metal; a first resin body, a resin of which closely adheres to one surface of the plate main body; and a second resin body, a resin of which closely adheres to the other surface of the plate main body. This endplate is arranged at an end of a fuel cell stack in which a plurality of cells are stacked. With respect to this endplate, the plate main body comprises a connection part that is provided with a connection hole by which the one surface and the other surface of the plate main body are in communication with each other, and through which the first resin body and the second resin body are connected with each other by means of a resin.

Description

[Technical Field]

[0001] The present disclosure relates to end plates. [Background technology]

[0002] Taking end plates placed at the ends of a stack of multiple FC stacks (fuel cell stacks) of fuel cells as an example, Patent Document 1 discloses a technology in which the end plates constituting the fuel cell stack are made of metal material and a resin layer is formed on the surface of the end plate that comes into contact with the fluid.

[0003] In a structure in which a resin layer is formed on metal as in Patent Document 1, it is also disclosed that the resin layer may contain an elastomer component or may contain reinforced glass fibers in order to suppress cracking of the resin due to the difference in thermal expansion between the metal and the resin layer.

[0004] The end plate described in Patent Document 2 has a structure basically in common with that of Patent Document 1 described above, and further has a structure that prevents water from entering the interface between the metal and the resin layer.

[0005] Although Patent Document 3 does not concern an end plate, it does show a three-layer metal-resin composite structure in which a metal plate and a fiber-reinforced resin composition are connected via a foamed resin composition. Structures in which a metal material and a fiber-reinforced resin are directly adhesively bonded together can undergo shape changes when heat changes due to differences in linear expansion coefficients. In Patent Document 3, shape changes caused by differences in linear expansion coefficients are absorbed by a foamed resin composition, thereby suppressing shape changes. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Japanese Patent Application Laid-Open No. 2015-8086 [Patent Document 2] Japanese Patent Application Laid-Open No. 2018-113120 [Patent Document 3] Japanese Patent Application Laid-Open No. 2007-196545 Summary of the Invention [Problem to be solved by the invention]

[0007] From the viewpoint of maintaining the strength of the end plates used in fuel cells and improving electrical insulation, a configuration in which a metal material is formed with a resin material on the surface of this metal material is effective.

[0008] However, simply forming a resin material on the surface of the metal material that makes up the end plate can cause the end plate to deform with temperature changes due to differences in linear expansion coefficients. To solve this problem, it is possible to use a resin layer containing an elastomer component, as described in Patent Document 1, or one that contains reinforced glass fibers.

[0009] However, even when a resin having an elastomer component or a resin containing reinforcing glass fibers is used, there is a concern that it is difficult to suppress deformation due to the difference in linear expansion coefficient. Therefore, as described in Patent Document 3, it is conceivable to dispose a foamed resin composition between the metal plate and the fiber-reinforced resin composition, but there is a concern that this requires multiple types of resins and leads to a complicated manufacturing process.

[0010] For these reasons, there is a need for an end plate that has a simple structure yet can suppress deformation due to temperature changes without compromising the effectiveness of using metal and resin materials. [Means for solving the problem]

[0011] The characteristic configuration of the end plate according to the present disclosure is that it is an end plate provided at the end of a fuel cell stack in which a plurality of cells are stacked, comprising a metal plate body, a first resin body having resin adhered to one surface of the plate body, and a second resin body having resin adhered to the other surface of the plate body, wherein a connecting hole is formed in the plate body to connect the one surface to the other surface, and the plate body is provided with a connecting portion where the first resin body and the second resin body are connected by the resin via the connecting hole.

[0012] According to this characteristic configuration, the plate body has a first resin body on one side and a second resin body on the other side, and a connecting portion connecting the first and second resin bodies. Therefore, even if the increase in length of the first and second resin bodies differs from the increase in length of the plate body when the temperature is raised by a set amount due to, for example, a difference in linear expansion coefficients, the bending force acting on the plate body from the first resin body and the bending force acting on the plate body from the second resin body can be made to be opposite in direction. This prevents deformation of the end plate even in a structure using metals and resins with different linear expansion coefficients, as the temperature changes, equal forces are applied in opposite directions from the resin on one side (first resin body) and the resin on the other side (second resin body). This cancels out the bending forces that deform the end plate. Furthermore, this characteristic configuration allows the first and second resin bodies to be made of the same material, eliminating the need for multiple types of resin and the resulting complex manufacturing process. As a result, an end plate was constructed that has a simple structure yet is capable of suppressing deformation due to temperature changes without compromising the effectiveness of using metal and resin materials.

[0013] In addition to the above configuration, the second resin body may be provided at an end of the fuel cell stack in the stacking direction.

[0014] With this, by sandwiching the fuel cell stack and applying pressure in the stacking direction, the multiple cells of the fuel cell stack can be brought into close contact with each other.

[0015] In addition to the above configuration, the plate main body may have a pair of first edges in a first direction and a second edge in a second direction different from the first direction, and the first resin body may have an outer peripheral resin portion formed in a circumferential shape by connecting the resin in a region along the pair of first edges and the resin in a region along the pair of second edges.

[0016] With this, resin is formed on one side and the other side of each of the pair of first edges in the first direction and the pair of second edges in the second direction of the rectangular plate body, so deformation of the end plate in the first direction and the second direction of the plate body can be suppressed even when the temperature changes. Also, because the resin of the pair of first edges and the resin of the pair of second edges are connected at their ends to form a peripheral resin portion formed around the periphery, even when force acts on the resin of the first edge and the resin of the second edge simultaneously, it is possible to transmit the force between the resin of the first edge and the resin of the second edge.

[0017] In addition to the above configuration, the first resin body may have a reinforcing portion between the pair of first edges, extending in the second direction and connected to the pair of first edges.

[0018] As a result, since the first resin body has a reinforcing portion parallel to the second edge between a pair of first edges, deformation caused by a force acting in the second direction on the rectangular plate body when the temperature changes can be suppressed by the resin of the reinforcing portion.

[0019] In addition to the above configuration, the connecting hole may be a first connecting hole that penetrates from one surface to the other surface of the reinforcing portion of the plate body, and the connecting portion may be a first connecting resin portion in which the resin is filled in the first connecting hole.

[0020] According to this, by providing the first connecting resin portion in the reinforcing portion, the reinforcing portion of the first resin body is reinforced by the second resin body, so deformation of the reinforcing portion can be suppressed. Also, because the first connecting resin portion connects the first resin body and the second resin body, the first resin body and the second resin body restrain the plate main body, so deformation of the end plate can be suppressed effectively.

[0021] In addition to the above configuration, the connecting hole may be a second connecting hole that penetrates from the one surface to the other surface of the first edge or the second edge of the plate body, and the connecting portion may be a second connecting resin portion in which the resin is filled in the second connecting hole.

[0022] According to this, by providing the second connecting resin portion on the first edge or the second edge of the plate body, the outer edge of the plate body can be reinforced. Also, because the first resin body and the second resin body are connected by the second connecting resin portion, the plate body can be restrained by the first resin body and the second resin body, and deformation of the end plate can be effectively suppressed.

[0023] In addition to the above configuration, the connecting hole may be a third connecting hole that penetrates from one side of the plate body to the other side and through which fluids supplied to and discharged from the fuel cell stack flow, and the connecting portion may be a third connecting resin portion in which the inner surface of the third connecting hole is covered with the resin.

[0024] According to this, by providing the third connecting resin portion on the plate body, the plate body can be reinforced. Also, because the first resin body and the second resin body are connected by the third connecting resin portion on the inner periphery of the third connecting hole, the plate body is restrained by the first resin body and the second resin body, and deformation of the end plate can be effectively suppressed. Furthermore, when fuel gas or oxidant gas is supplied to multiple cells from one side to the other of the end plate, it flows through the third connecting hole whose inner periphery is formed with resin, and therefore the inner periphery of the third connecting hole can also be protected by resin.

[0025] In addition to the above configuration, the second resin body may have a groove-shaped path that guides a fluid flowing in the fuel cell stack.

[0026] With this, the temperature of the entire end plate can be made closer to uniform by circulating the fluid through the path. [Brief explanation of the drawings]

[0027] [Figure 1] FIG. 2 is an exploded perspective view of the fuel cell. [Figure 2] FIG. 2 is a front view of the first end plate as seen from the outer surface side. [Figure 3] FIG. 2 is a plan view of the first end plate seen from above. [Figure 4] is a diagram listing an oblique view showing only the one-side resin body and the other-side resin body as viewed from the outer surface side, an oblique view showing only the plate main body as viewed from the outer surface side, and an oblique view showing the plate main body having the one-side resin body and the other-side resin body as viewed from the outer surface side. [Figure 5] FIG. 10 is a rear view of the first end plate as seen from the inner surface side. [Figure 6] is a diagram listing an oblique view showing only the other-side resin body and one-side resin body as viewed from the inner surface side, an oblique view showing only the plate main body as viewed from the inner surface side, and an oblique view of the plate main body having the other-side resin body and one-side resin body as viewed from the inner surface side. [Figure 7] 7 is a cross-sectional view taken along line VII-VII in FIG. 2. [Figure 8] 8 is a cross-sectional view taken along line VIII-VIII in FIG. 2. [Figure 9] 9 is a cross-sectional view taken along line IX-IX in FIG. 2. DETAILED DESCRIPTION OF THE INVENTION

[0028] Hereinafter, embodiments of the present disclosure will be described with reference to the drawings. [Basic configuration] As shown in Figure 1, fuel cell A is configured to house an FC stack 2 (an example of a fuel cell stack) in which multiple FC cells 2a (an example of a cell) are stacked in a case 1, a plate 3, and a first end plate P1 and a second end plate P2 that sandwich the FC stack 2 in the stacking direction of the multiple FC cells 2a.

[0029] This fuel cell A has a first end plate P1 fixed to one end of the case 1 with multiple bolts 4, and a second end plate P2 fixed to the other end of the case 1 with multiple bolts 4, thereby sealing the case 1 and applying pressure in the stacking direction via the plate 3 to bring the multiple FC stacks 2 into close contact with each other.

[0030] In this fuel cell A, a humidifier 6, piping 7 for supplying and discharging oxidant gas, a control valve 8 for controlling the flow of gas, etc. are provided on the outer surface of a first end plate P1. In addition, a plurality of communication holes H (an example of connecting holes and third connecting holes) for supplying and discharging oxidant gas, fuel gas, etc. to the FC stack 2 are formed as through holes in the first end plate P1.

[0031] [End plate] The first end plate P1 and the second end plate P2 are collectively referred to as end plate P. In this embodiment, the first end plate P1 will be described in detail.

[0032] 2 to 9, the first end plate P1 includes a metal (aluminum) plate body 11 that is generally plate-shaped, a one-side resin body 12 (an example of a first resin body) made of resin that adheres to the outer surface (an example of one surface) of the plate body 11, and an other-side resin body 13 (an example of a second resin body) made of resin that adheres to the inner surface (an example of the other surface) of the plate body 11 opposite the outer surface. As will be described later, the one-side resin body 12 and the other-side resin body 13 are simultaneously formed by injection molding from the same resin (PPS (Poly Phenylene Sulfide)).

[0033] This configuration comprising a plate body 11, a one-side resin body 12, and an other-side resin body 13 is not limited to the first end plate P1, but can also be applied to the second end plate P2.

[0034] In the fuel cell A, the other surface side resin body 13 of the first end plate P1 is disposed on the side facing (inside) the end of the FC stack 2 in the stacking direction. Therefore, the one surface side resin body 12 of the first end plate P1 is disposed on the side facing (outside) the humidifier 6. Note that in a configuration in which the second end plate P2 includes the plate main body 11, one surface side resin body 12, and other surface side resin body 13, the other surface side resin body 13 is disposed on the side facing the end of the FC stack 2 in the stacking direction.

[0035] The first end plate P1 includes a plate body 11, a one-side resin body 12, and an other-side resin body 13, thereby increasing the strength of the end plate P and improving the insulation and sealing properties of specified areas.

[0036] In the first end plate P1, the plate body 11 made of metal and the one surface side resin body 12 and the other surface side resin body 13 made of resin have different linear expansion coefficients.

[0037] For this reason, when the temperature changes, the first end plate P1 causes the forces associated with the thermal expansion of the one-side resin body 12 and the other-side resin body 13 to act equally on the plate main body 11 from both the one-side and inner sides, thereby canceling out the forces associated with the thermal expansion of the plate main body 11 and suppressing deformation of the first end plate P1.

[0038] As shown in FIG. 2, the first end plate P1 has a rectangular shape having a pair of left and right vertical edges Pv (an example of a first edge) along the vertical direction V (an example of a first direction) when viewed in a direction perpendicular to the outer surface, and a pair of upper and lower horizontal edges Pw (an example of a second edge) along the horizontal direction W (an example of a second direction). As shown in each of the first-surface resin body 12 shown in FIG. 2 and the other-surface resin body 13 shown in FIG. 5, resin is formed in regions along the pair of left and right vertical edges Pv and in regions along the pair of upper and lower horizontal edges Pw. The resin in the region along the pair of vertical edges Pv and the resin in the region along the pair of horizontal edges Pw are connected at their respective ends, forming a circumferential (annular) outer peripheral resin portion 12A as a whole. The other-surface resin body 13 is formed on the entire inner surface of the first end plate P1 except for the outer peripheral portion.

[0039] [End plate: plate body] As shown in Fig. 4, the upper part of Fig. 4 shows a perspective view of the one-side resin body 12 and the other-side resin body 13 of the first end plate P1 as viewed from the outer surface side. The middle part of Fig. 4 shows a perspective view of the plate body 11 of the first end plate P1 as viewed from the outer surface side. The lower part of Fig. 4 shows a perspective view of the entire first end plate P1 (the plate body 11 on which the one-side resin body 12 and the other-side resin body 13 are formed) as viewed from the outer surface side.

[0040] As shown in Fig. 6, the upper part of Fig. 6 shows a perspective view of the other surface side resin body 13 and the one surface side resin body 12 of the first end plate P1 as viewed from the inner surface side. The middle part of Fig. 6 shows a perspective view of the plate main body 11 of the first end plate P1 as viewed from the inner surface side. The lower part of Fig. 6 shows a perspective view of the entire first end plate P1 (the plate main body 11 on which the other surface side resin body 13 and the one surface side resin body 12 are formed) as viewed from the inner surface side.

[0041] As shown in the middle of Fig. 4 and the middle of Fig. 6, the plate body 11 has a plurality of communication holes H formed therein that penetrate from the outer surface to the inner surface. The communication holes H are formed in the plate body 11, and the inner peripheral surfaces of the communication holes H are covered with resin, and the structure in which the inner peripheral surface is covered with resin is also referred to as the communication hole H. The above-mentioned piping 7 is connected to any of the plurality of communication holes H, and a gas flow path that supplies and exhausts gas to and from the humidifier 6 is connected to it.

[0042] As shown in the middle of Figure 4, an outer edge portion 11a is formed in a region surrounding the outer periphery on the outer surface side of the plate body 11. The plate body 11 has outer peripheral resin filling grooves 11ag formed in regions of the outer peripheral portion 11a that are aligned with a pair of vertical directions V and a pair of horizontal directions W, and the ends of these outer peripheral resin filling grooves 11ag are connected by arc-shaped grooves. In this way, the outer edge portion 11a of the plate body 11 is formed in a circumferential (annular) shape when viewed in a direction perpendicular to the outer surface of the plate body 11.

[0043] 6, a protruding region 11f is formed on the inner surface of the plate body 11, where the central portion of the plate body 11 protrudes toward the rear surface side. A plurality of (three in this embodiment) protruding wall-shaped guide bodies 11g are formed in the protruding region 11f.

[0044] [Peripheral through hole / Central through hole] 4, the plate body 11 has a plurality of peripheral through-holes 11d (an example of connecting holes and second connecting holes) formed therein in an area overlapping with the peripheral resin filling groove 11ag. Furthermore, the plate body 11 has an annular resin filling groove 11bg formed on the inner circumferential side of the opening edge portion 11b on the outer surface side of the communication hole H formed in the plate body 11, and this annular resin filling groove 11bg is connected to the peripheral resin filling groove 11ag.

[0045] As shown in Figures 2 and 4, the multiple communicating holes H are positioned at positions offset near both ends of the plate body 11 in the horizontal direction W, and when viewed in a direction perpendicular to the outer surface of the plate body 11, multiple ribs 11c (in this embodiment, three in the vertical direction V and two in the horizontal direction W) are formed extending vertically and horizontally in the area inward in the horizontal direction W from these communicating holes H.

[0046] Of the multiple ribs 11c, a pair of ribs 11c extending in the lateral direction W parallel to the lateral edge Pw each have a central resin filling groove 11cg formed in the center in the width direction. This forms a pair of central resin filling grooves 11cg in the plate body 11. Additionally, the plate body 11 has a plurality of central through-holes 11e (an example of connecting holes and first connecting holes) that penetrate the plate body 11 in regions that overlap with the central resin filling grooves 11cg in the center in the width direction of the pair of ribs 11c.

[0047] [End plate: resin formation] The first end plate P1 is formed by injection molding, in which resin is supplied into a mold (not shown) while the plate is set inside the mold, to form a one-side resin body 12 in close contact with the outer surface of the plate body 11, and simultaneously form a other-side resin body 13 in close contact with the inner surface of the plate body 11. The one-side resin body 12 and the other-side resin body 13 are made of the same resin.

[0048] When forming the one-surface resin body 12 by injection molding, the resin is filled into the outer peripheral resin filling groove 11ag of the outer edge portion 11a of the plate body 11 to form the annular outer peripheral resin portion 12A, as shown in the upper and lower parts of Fig. 4. In addition, the resin filled into the annular resin filling grooves 11bg of the plurality of opening edge portions 11b is integrated with the outer peripheral resin portion 12A.

[0049] Furthermore, by filling the central resin filling groove 11cg of the pair of ribs 11c with resin, an annular reinforcing resin portion 12B (an example of a reinforcing portion) is formed as shown in the upper and lower parts of FIGS.

[0050] When the other-surface resin body 13 is formed by injection molding, an inner-surface protruding resin portion 13A is formed in an area covering the protruding area 11f of the plate main body 11, and a flow path 13G (an example of a path) is formed with a protruding structure by a plurality of guide bodies 11g, as shown in Figures 3 and 6. This flow path 13G communicates with one of the plurality of communication holes H and guides the fluid supplied to and discharged from the FC stack 2. By having the fluid flow through the flow path 13G, the temperature of the entire first end plate P1 can be made nearly uniform.

[0051] The one-surface resin body 12 and the other-surface resin body 13 are formed simultaneously by injecting resin into a mold. As a result, the resin fills the peripheral through-holes 11d and the central through-holes 11e of the plate body 11 from the outer surface side and the inner surface side, as shown in the upper part of Fig. 4 and Fig. 7. As shown in the upper part of Fig. 4 and Figs. 7 to 9, the resin filled into the peripheral through-holes 11d is referred to as a peripheral connecting resin portion 14 (an example of a connecting portion and a second connecting resin portion), and the resin filled into the central through-holes 11e is referred to as a central connecting resin portion 15 (an example of a connecting portion and a first connecting resin portion).

[0052] In addition, the resin filled into the annular resin filling groove 11bg from the outer surface side is integrated with the resin filled into the outer peripheral resin filling groove 11ag and is filled into the inner surface of the communicating hole H, thereby forming a communicating resin portion 16 (an example of a connecting portion and a third connecting resin portion).

[0053] In this way, the one-side resin body 12 and the other-side resin body 13 are simultaneously formed by injection molding, and multiple outer peripheral connecting resin portions 14, multiple central connecting resin portions 15, and multiple communicating resin portions 16 are connected to the one-side resin body 12 and the other-side resin body 13, thereby integrating the one-side resin body 12 and the other-side resin body 13.

[0054] [Effects of the embodiment] In this way, because the one-side resin body 12 and the other-side resin body 13 are formed from the same resin, the linear expansion coefficients of the one-side resin body 12 and the other-side resin body 13 are equal. As a result, even if, for example, the amount of increase in length of the resin and the amount of increase in length of the metal of the plate main body 11 differ due to a change in temperature, equal bending forces are applied from the one-side resin body 12 and the other-side resin body 13, and the bending forces acting from the respective resins cancel out the forces that bend the first end plate P1, thereby suppressing deformation of the first end plate P1.

[0055] Furthermore, the first end plate P1 has a one-side resin body 12 formed along the vertical direction V and the horizontal direction W on the outer edge portion 11a on the outer surface, and a other-side resin body 13 formed on the entire inner surface, so that deformation due to temperature changes in both the vertical direction V and the horizontal direction W can be equally suppressed.

[0056] Furthermore, the one-surface resin body 12 and the other-surface resin body 13 are integrated by a plurality of outer periphery connecting resin portions 14, a plurality of central connecting resin portions 15, and a plurality of communicating resin portions 16 that penetrate the plate body 11. In this manner, the plurality of outer periphery connecting resin portions 14, the plurality of central connecting resin portions 15, and the plurality of communicating resin portions 16 restrain the first end plate P1, further effectively suppressing deformation due to temperature changes.

[0057] By forming the other surface side resin body 13 on the entire surface of the inner surface of the plate body 11 so that the inner surface protruding resin portion 13A protrudes from the inner surface of the plate body 11, it becomes possible to apply pressure by bringing the other surface side resin body 13 into contact with the end of the FC stack 2. Furthermore, by forming the other surface side resin body 13, it becomes possible to improve the insulation properties of the first end plate P1 and to improve the sealing properties of the case 1.

[0058] The formation of multiple ribs 11c on plate body 11 reduces the thickness and makes it possible to reduce the weight. Furthermore, by forming ribs 11c in this manner, the strength of plate body 11 is improved without increasing the weight, and the formation of one-side resin body 12 and other-side resin body 13 realizes improved strength without increasing the weight.

[0059] By forming the other side resin body 13 and forming a communicating resin portion 16 on the inner periphery of the communicating hole H, it is possible to prevent the oxidizer gas and fuel gas supplied to and discharged from the FC stack 2 from coming into contact with the plate main body 11, which can cause corrosion.

[0060] [Another embodiment] The present disclosure may be configured as follows in addition to the above-described embodiments (common numbers and symbols as in the embodiments are used to designate components having the same functions as in the embodiments).

[0061] (a) The one-surface resin body 12 is formed on the entire outer surface of the plate body 11, and the other-surface resin body 13 is formed on the entire inner surface of the plate body 11. By configuring in this manner, deformation of the end plate P can be effectively suppressed.

[0062] (b) A number of ribs 11c extending in the vertical direction V and the horizontal direction W when viewed in a direction perpendicular to the outer surface of the plate body 11 may be formed on the plate body 11, and resin filling grooves and peripheral through-holes 11d may be formed in these ribs. Furthermore, it is also possible to form resin filling grooves in the plurality of ribs 11c extending in the vertical direction V and the plurality of ribs 11c extending in the horizontal direction W, and to configure the plate body 11 so that resin is filled in each of them.

[0063] (c) The plurality of through holes formed in the plate body 11 in a penetrating state and filled with resin may be formed at any position. [Industrial Applicability]

[0064] The present disclosure can be used for end plates. [Explanation of symbols]

[0065] 2 FC stack (fuel cell stack) 2a FC cell (cell) 11 Plate body 11d Peripheral through hole (connection hole, second connection hole) 11e Center through hole (connection hole, 1st connection hole) 12 One-side resin body (first resin body) 12A Outer resin part 12B Reinforcing resin part (reinforcing part) 13 Other side resin body (second resin body) 13G Flow path (path) 14 Outer connecting resin part (connecting part, second connecting resin part) 15 Central connecting resin part (connecting part, first connecting resin part) 16 Connecting resin part (connecting part, third connecting resin part) H Communication hole (connection hole, 3rd connection hole) P end plate P1 First end plate (end plate) P2 Second end plate (end plate) Pv vertical edge (first edge) Pw lateral edge (second edge) V Vertical direction (first direction) W Horizontal direction (second direction)

Claims

1. A metal plate body; a first resin body having a resin adhered to one surface of the plate body; a second resin body having the resin adhered to the other surface of the plate body, An end plate provided at an end of a fuel cell stack in which a plurality of cells are stacked, a connecting hole that communicates the one surface with the other surface is formed in the plate body, and a connecting portion that connects the first resin body and the second resin body by the connecting hole is provided, The plate body has a pair of first edges along a first direction and a second edge along a second direction different from the first direction, The first resin body is an end plate having a peripheral resin portion formed in a circumferential shape by connecting the resin in a region along a pair of the first edges and the resin in a region along a pair of the second edges.

2. The end plate according to claim 1 , wherein the second resin body is provided at an end of the fuel cell stack in the stacking direction.

3. The end plate according to claim 1 , wherein the first resin body has a reinforcing portion between the pair of first edges, the reinforcing portion extending in the second direction and connected to the pair of first edges.

4. the connecting hole is a first connecting hole that penetrates from the one surface to the other surface of the reinforcing portion of the plate body, The end plate according to claim 3 , wherein the connecting portion is a first connecting resin portion formed by filling the first connecting hole with the resin.

5. the connecting hole is a second connecting hole that penetrates from the one surface to the other surface of the first edge or the second edge of the plate body, The end plate according to claim 1 , wherein the connecting portion is a second connecting resin portion formed by filling the second connecting hole with the resin.

6. the connecting hole is a third connecting hole that penetrates from the one surface to the other surface of the plate body and through which fluid is supplied to and discharged from the fuel cell stack; The end plate according to claim 1 , wherein the connecting portion is a third connecting resin portion in which an inner peripheral surface of the third connecting hole is covered with the resin.

7. The end plate according to claim 1 , wherein the second resin body has a groove-shaped passage that guides a fluid flowing through the fuel cell stack.

Images