JP2010262908A - Fuel cell stack - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fuel cell stack which has an easy and compact structure, and satisfactorily mounts a resin piping member on an end plate with desired sealing properties. <P>SOLUTION: In the fuel cell stack 10, a plurality of fuel cells 12 are laminated, and a first terminal plate 14a, a first insulating plate 16a, and a first end plate 18a are laminated at one end side in the laminated direction. A communication opening 70 inserted into an oxidizer gas inlet manifold hole 56a of the end plate 18a and connections 74 connected to a pipe line 72 by projecting outside the first end plate 18a are provided on the resin piping member 64a. An O-ring 82 is interposed between an end of the communication opening 70 and the first insulating plate 16a. The O-ring 82 is arranged at an outer peripheral section of the communication opening 70, and has a sealing function by slidably coming in contact with the inner peripheral surface of an oxidizer gas inlet 50a. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  In the present invention, a plurality of fuel cells in which an electrolyte membrane / electrode structure provided with a pair of electrodes on both sides of an electrolyte membrane and a separator are stacked are stacked, and a terminal plate, an insulating plate, and an end are stacked at both ends in the stacking direction. The present invention relates to a fuel cell stack in which a plate is disposed and at least one of the end plates has a fluid supply or fluid discharge manifold hole through which a cooling medium or a reaction gas flows.

  For example, in a polymer electrolyte fuel cell, an electrolyte membrane / electrode structure (MEA) in which an anode side electrode and a cathode side electrode are disposed on both sides of an electrolyte membrane made of a polymer ion exchange membrane is sandwiched by separators. A unit cell is provided. This type of fuel cell is normally used as a fuel cell stack by stacking a predetermined number of unit cells.

  In the above fuel cell, a fuel gas channel for flowing fuel gas to the anode side electrode and an oxidant gas channel for flowing oxidant gas to the cathode side electrode are provided in the plane of the separator. . Furthermore, between the separators, a cooling medium flow path for flowing the cooling medium is provided along the surface direction of the separator.

  At that time, at least an end plate disposed at one end in the stacking direction has a fuel gas supply communication hole for supplying the fuel gas to the fuel gas passage, and a fuel gas discharge for discharging the spent fuel gas from the fuel gas passage. The communication hole, the oxidant gas supply communication hole for supplying the oxidant gas to the oxidant gas flow path, the oxidant gas discharge communication hole for discharging the used oxidant gas from the oxidant gas flow path, and the cooling medium flow path A cooling medium supply communication hole for supplying the cooling medium and a cooling medium discharge communication hole for discharging the used cooling medium from the cooling medium flow path are formed.

  For example, in the fuel cell disclosed in Patent Document 1, as shown in FIG. 7, a fuel gas supply through hole 2a, which is a manifold hole, is provided on one end side of one pressure plate (end plate) 1, and cooling water is supplied. A through hole 3a and an oxidant gas supply through hole 4a are formed. On the other end side of the pressure plate 1, a fuel gas discharge through hole 2b, a coolant discharge through hole 3b, and an oxidant gas, which are manifold holes, are formed. A discharge through hole 4b is formed.

  The pressure plate 1 is provided with a resin inlet hole collecting conduit 5a and an outlet hole collecting conduit 5b which are excellent in corrosion resistance and electrical insulation. The inlet hole collecting conduit 5a is fitted into the fuel gas inlet hole conduit 6a fitted into the fuel gas supply through hole 2a, the cooling water inlet hole conduit 7a fitted into the cooling water supply through hole 3a, and the oxidant gas supply through hole 4a. There is an oxidant gas inlet hole conduit 8a to be combined, which are integrated by a flange 9a.

  The outlet hole collecting conduit 5b is fitted into the fuel gas outlet hole conduit 6b fitted into the fuel gas discharge through hole 2b, the cooling water outlet hole conduit 7b fitted into the cooling water discharge through hole 3b, and the oxidant gas discharge through hole 4b. There is an oxidant gas outlet hole conduit 8b to be combined, and these are integrated by a flange 9b.

JP 2000-164238 A

  By the way, in the above-mentioned Patent Document 1, an inlet hole collecting conduit 5a and an outlet hole collecting conduit 5b that are particularly excellent in corrosion resistance are attached to the pressure plate 1, and the inlet hole collecting conduit 5a and the outlet hole collecting conduit 5b are mounted. Are laminated on an insulating plate and a manifold plate (not shown) arranged on both surfaces of the pressure plate 1 via seal members, respectively.

  In this manifold plate, manifold holes for supplying or discharging the respective fluids to the inlet / outlet holes of the fuel gas, the oxidant gas, and the cooling water are gathered. Is connected. Therefore, there is a problem that the seal structure becomes complicated and the number of parts increases, which is not economical.

  The present invention solves this type of problem, and provides a fuel cell stack that has a simple and compact configuration and that can be favorably attached to an end plate with a resin piping member having a desired sealing property. The purpose is to do.

  In the present invention, a plurality of fuel cells in which an electrolyte membrane / electrode structure provided with a pair of electrodes on both sides of an electrolyte membrane and a separator are stacked are stacked, and a terminal plate, an insulating plate, and an end are stacked at both ends in the stacking direction. The present invention relates to a fuel cell stack in which a plate is disposed, and at least one of the end plates is formed with a manifold hole for supplying a fluid or a fluid for flowing a cooling medium or a reaction gas.

  The fuel cell stack includes a resin piping member that is attached to one end plate and supplies or discharges a cooling medium or a reaction gas to or from the fuel cell. The resin piping member is provided integrally with a communication port portion to be inserted into the manifold hole and a connection portion that protrudes to the outside of one end plate and is connected to the pipe line, and an end portion of the communication port portion. A sealing member is interposed between the insulating plate and the insulating plate.

  Moreover, it is preferable that the insulating plate is provided with a seal member around the communication hole communicating with the manifold hole at a position where the end face of the communication port portion contacts.

  Further, the fuel cell stack is preferably provided on the insulating plate, and a seal member is interposed between the inner peripheral surface of the communication hole communicating with the manifold hole and the end surface of the communication port. .

  Furthermore, in the fuel cell stack, it is preferable that a seal member is interposed between the inner peripheral surface of the manifold hole of one end plate and the end peripheral surface of the communication opening.

  According to the present invention, the resin piping member has the communication port portion inserted into the manifold hole of the end plate, and the seal member interposed between the end portion of the communication port portion and the insulating plate, It has a desired sealing function. For this reason, the resin-made piping member and the end plate can be configured separately, and for example, only the resin-made piping member can be easily replaced.

  Moreover, the resin piping member is provided with a connecting portion that protrudes to the outside of the end plate and is connected to the pipe line. Therefore, the pipe connection structure and the seal structure are simplified, and the number of parts can be reduced. Accordingly, the resin-made piping member can be mounted on the end plate with a desired sealing property with a simple and compact configuration.

1 is a schematic perspective explanatory view of a fuel cell stack according to a first embodiment of the present invention. 2 is an exploded perspective view of a fuel cell constituting the fuel cell stack. FIG. FIG. 3 is an exploded perspective view of a main part of the fuel cell stack. It is principal part sectional drawing of the said fuel cell stack. It is principal part cross-sectional explanatory drawing of the fuel cell stack which concerns on the 2nd Embodiment of this invention. It is principal part cross-sectional explanatory drawing of the fuel cell stack which concerns on the 3rd Embodiment of this invention. 2 is a partial perspective explanatory view of a fuel cell disclosed in Patent Document 1. FIG.

  As shown in FIG. 1, in the fuel cell stack 10 according to the first embodiment of the present invention, a plurality of fuel cells 12 are stacked in an arrow A direction (horizontal direction) or an arrow C direction (gravity direction). The first terminal plate 14a, the first insulating plate 16a and the first end plate 18a are stacked at one end in the stacking direction of the fuel cell 12, while the second terminal plate 14b and the second insulating plate are stacked at the other end in the stacking direction. 16b and the second end plate 18b are stacked.

  The first end plate 18 a and the second end plate 18 b configured in a rectangular shape are integrally clamped and held by a plurality of tie rods 19 extending in the arrow A direction. The fuel cell stack 10 may be integrally held by a box-like casing (not shown) including the first end plate 18a and the second end plate 18b as end plates.

  As shown in FIG. 2, the fuel cell 12 includes an electrolyte membrane / electrode structure 20 sandwiched between first and second separators 22 and 24. The first and second separators 22 and 24 are made of, for example, a metal separator such as a steel plate, a stainless steel plate, an aluminum plate, or a plated steel plate, in addition to a carbon separator.

  An oxidation for supplying an oxidant gas, for example, an oxygen-containing gas, to the upper edge of the fuel cell 12 in the direction of arrow C (the gravitational direction in FIG. 2) communicates with each other in the direction of arrow A which is the stacking direction An agent gas inlet communication hole 26a and a fuel gas inlet communication hole 28a for supplying a fuel gas, for example, a hydrogen-containing gas, are arranged in the arrow B direction (horizontal direction).

  The lower end edge of the fuel cell 12 in the direction of arrow C communicates with each other in the direction of arrow A, and the oxidant gas outlet communication hole 26b for discharging the oxidant gas, and the fuel gas outlet for discharging the fuel gas. The communication holes 28b are arranged in the arrow B direction.

  For example, two cooling medium inlet communication holes 30a for supplying a cooling medium and two cooling medium outlet communication holes 30b for discharging the cooling medium are provided at both ends of the fuel cell 12 in the arrow B direction. One by one (or one by one).

  An oxidant gas flow path 32 communicating with the oxidant gas inlet communication hole 26a and the oxidant gas outlet communication hole 26b is provided on the surface 22a of the first separator 22 facing the electrolyte membrane / electrode structure 20.

  A fuel gas passage 34 communicating with the fuel gas inlet communication hole 28a and the fuel gas outlet communication hole 28b is provided on the surface 24a of the second separator 24 facing the electrolyte membrane / electrode structure 20.

  A cooling medium that connects the cooling medium inlet communication hole 30a and the cooling medium outlet communication hole 30b between the surface 22b of the first separator 22 and the surface 24b of the second separator 24 that constitute the fuel cells 12 adjacent to each other. A flow path 36 is provided.

  A first seal member 38 is integrally or individually provided on the surfaces 22 a and 22 b of the first separator 22, and a second seal member 40 is integrally formed on the surfaces 24 a and 24 b of the second separator 24. Or individually.

  The first and second sealing members 38 and 40 are, for example, EPDM, NBR, fluorine rubber, silicon rubber, fluorosilicone rubber, butyl rubber, natural rubber, styrene rubber, chloroprene, or acrylic rubber or the like, cushioning material, Alternatively, a packing material is used.

  The electrolyte membrane / electrode structure 20 includes, for example, a solid polymer electrolyte membrane 42 in which a perfluorosulfonic acid thin film is impregnated with water, and a cathode side electrode 44 and an anode side electrode 46 that sandwich the solid polymer electrolyte membrane 42. With.

  The cathode side electrode 44 and the anode side electrode 46 are formed by uniformly applying a gas diffusion layer made of carbon paper or the like and porous carbon particles having a platinum alloy supported on the surface thereof to the surface of the gas diffusion layer. An electrode catalyst layer. The electrode catalyst layers are formed on both surfaces of the solid polymer electrolyte membrane 42.

  As shown in FIG. 3, the first insulating plate 16a has a circular oxidant gas inlet 50a and an oxidant gas outlet 50b communicating with the oxidant gas inlet communication hole 26a and the oxidant gas outlet communication hole 26b, and a fuel. A fuel gas inlet 52a and a fuel gas outlet 52b that communicate with the gas inlet communication hole 28a and the fuel gas outlet communication hole 28b, and two cooling medium inlets 54a and 52b that communicate with the cooling medium inlet communication hole 30a and the cooling medium outlet communication hole 30b, respectively. A cooling medium outlet 54b is formed.

  The first end plate (one end plate) 18a includes an oxidant gas inlet manifold hole 56a and an oxidant gas outlet manifold hole 56b communicating with the oxidant gas inlet 50a and the oxidant gas outlet 50b of the first insulating plate 16a. The fuel gas inlet manifold hole 58a and the fuel gas outlet manifold hole 58b communicating with the fuel gas inlet 52a and the fuel gas outlet 52b, and the cooling medium inlet manifold hole 60a communicating with the two cooling medium inlets 54a and the cooling medium outlet 54b, respectively. A cooling medium outlet manifold hole 60b is formed.

  The first end plate 18a includes both left and right sides of the oxidant gas inlet manifold hole 56a, left and right sides of the fuel gas inlet manifold hole 58a, left and right sides of the oxidant gas outlet manifold hole 56b, left and right sides of the fuel gas outlet manifold hole 58b, and cooling. Screw holes 62 are formed on both upper and lower sides of the medium inlet manifold holes 60a and 60a and on both upper and lower sides of the cooling medium outlet manifold holes 60b and 60b.

  A resin piping member 64a is attached to the oxidant gas inlet manifold hole 56a, a resin piping member 64b is attached to the oxidant gas outlet manifold hole 56b, and a resin piping is attached to the fuel gas inlet manifold hole 58a. A member 66a is attached, a resin piping member 66b is attached to the fuel gas outlet manifold hole 58b, and a resin piping member 68a is integrally attached to the pair of cooling medium inlet manifold holes 60a, 60a. A resin piping member 68b is integrally attached to the cooling medium outlet manifold holes 60b and 60b (see FIG. 1). The resin piping members 64a, 64b, 66a, 66b, 68a, and 68b are individual members.

  As shown in FIGS. 3 and 4, the resin piping member 64a is made of, for example, PPS (polyphenylene sulfide) or PPE (polyphenylene ether), and the oxidizing gas inlet manifold hole 56a of the first end plate 18a. A communication port portion 70 to be inserted into the first end plate 18a and a connection portion 74 that protrudes to the outside of the first end plate 18a and is connected to the external pipe line 72 are integrally provided.

  A flange portion 76 is integrally formed between the communication port portion 70 and the connection portion 74, and a pair of hole portions 78 are formed in the flange portion 76 corresponding to the screw holes 62.

  A circumferential groove portion 80 is formed on the peripheral surface of the end portion of the communication port portion 70, and a seal member, for example, an O-ring 82 is disposed in the groove portion 80. The O-ring 82 is in sliding contact with the inner peripheral surface of the oxidant gas inlet 50a of the first insulating plate 16a (see FIG. 4).

  A screw 83 is inserted into the pair of holes 78 formed in the flange portion 76. When the tip of the screw 83 is screwed into the screw hole 62 of the first end plate 18a, the resin piping member 64a is attached to the first end plate 18a corresponding to the oxidant gas inlet manifold hole 56a. The

  The resin piping members 64b, 66a and 66b are configured in the same manner as the resin piping member 64a described above, and the same components are denoted by the same reference numerals, and detailed description thereof is omitted. .

  As shown in FIG. 3, the resin piping member 68a includes a pair of communication port portions 84a and 84b inserted into the pair of cooling medium inlet manifold holes 60a and 60a of the first end plate 18a, and the communication port portions 84a, A main body 86 that communicates integrally with 84b, and a connection portion 88 that is provided integrally with the main body 86 and that protrudes outside the first end plate 18a and is connected to the external pipe line 72 are provided. Flange portions 90 a and 90 b are provided on both upper and lower sides of the main body 86, and holes 92 a and 92 b are formed in the flange portions 90 a and 90 b corresponding to the screw holes 62.

  Circulating grooves 94a and 94b are formed in the communication ports 84a and 84b, and seal members, for example, O-rings 96a and 96b are attached to the grooves 94a and 94b, respectively.

  A screw 83 is inserted into the holes 92a and 92b of the resin piping member 68a, and the tip of the screw 83 is screwed into the screw hole 62 of the first end plate 18a. As a result, the resin piping member 68a is mounted on the first end plate 18a by inserting the communication port portions 84a and 84b into the cooling medium inlet manifold holes 60a and 60a.

  The resin piping member 68b is configured in the same manner as the resin piping member 68a described above, and the same components are denoted by the same reference numerals, and detailed description thereof is omitted.

  The operation of the fuel cell stack 10 configured as described above will be described below.

  First, as shown in FIG. 1, an oxidant gas such as an oxygen-containing gas is supplied to the resin piping member 64a through a pipe 72, and a fuel gas such as a hydrogen-containing gas is supplied to the resin piping member 66a. Is done. Further, a cooling medium such as pure water or ethylene glycol is supplied to the resin piping member 68a.

  For this reason, as shown in FIG. 2, the oxidant gas is introduced into the oxidant gas flow path 32 of the first separator 22 from the oxidant gas inlet communication hole 26 a. The oxidant gas is supplied to the cathode side electrode 44 constituting the electrolyte membrane / electrode structure 20 while moving in the arrow C direction.

  On the other hand, the fuel gas is introduced into the fuel gas flow path 34 of the second separator 24 from the fuel gas inlet communication hole 28a. This fuel gas is supplied to the anode side electrode 46 constituting the electrolyte membrane / electrode structure 20 while moving in the direction of arrow C.

  Therefore, in the electrolyte membrane / electrode structure 20, the oxidant gas supplied to the cathode side electrode 44 and the fuel gas supplied to the anode side electrode 46 are consumed by an electrochemical reaction in the electrode catalyst layer to generate power. Is done.

  Next, the oxidant gas consumed by being supplied to the cathode side electrode 44 is discharged in the direction of arrow A along the oxidant gas outlet communication hole 26b. The oxidant gas is discharged to the pipeline 72 through the resin piping member 64b (see FIG. 1).

  On the other hand, the fuel gas consumed by being supplied to the anode electrode 46 is discharged in the direction of arrow A along the fuel gas outlet communication hole 28b. The fuel gas is discharged to the pipeline 72 through the resin piping member 66b.

  The cooling medium supplied to the cooling medium inlet communication hole 30a is introduced into the cooling medium flow path 36 between the first and second separators 22 and 24 and then flows in the direction of arrow B. After cooling the electrolyte membrane / electrode structure 20, the cooling medium is discharged from the cooling medium outlet communication hole 30b to the pipe line 72 through the resin piping member 68b.

  In this case, in the first embodiment, as shown in FIGS. 3 and 4, the resin piping member 64a has the communication port portion 70 inserted into the oxidant gas inlet manifold hole 56a of the first end plate 18a. . At that time, between the end of the communication port 70 and the first insulating plate 16a, specifically, the outer periphery of the end of the communication port 70 and the inner periphery of the oxidant gas inlet 50a of the first insulating plate 16a. A desired sealing function is provided by an O-ring (radial seal) 82 interposed between the surfaces. The O-ring 82 may be provided in a circumferential groove (not shown) provided on the first insulating plate 16a side.

  For this reason, the resin piping member 64a and the first end plate 18a can be configured separately, and only the resin piping member 64a can be easily replaced with the first end plate 18a. Become.

  In addition, the resin piping member 64a is integrally provided with a connecting portion 74 that protrudes outside the first end plate 18a and is connected to the pipe 72. Therefore, the connection structure and the seal structure of the pipe line 72 are simplified, and the number of parts can be reduced. As a result, the fuel cell stack 10 has the simple and compact configuration, and has an effect that the resin-made piping member 64a can be favorably attached to the first end plate 18a with a desired sealing property.

  The other resin piping members 64b, 66a, 66b, 68a and 68b can achieve the same effects as the resin piping member 64a.

  FIG. 5 is an explanatory cross-sectional view of a main part of a fuel cell stack 100 according to the second embodiment of the present invention.

  The same components as those of the fuel cell stack 10 according to the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted. Similarly, in the third embodiment described below, detailed description thereof is omitted.

  The fuel cell stack 100 includes a resin piping member 102. The resin piping member 102 is integrally provided with a communication port portion 104 inserted into the oxidant gas inlet manifold hole 56a of the first end plate 18a and a connection portion 74. The length of the communication port portion 104 is set to be equal to the thickness of the first end plate 18a, and the end surface 104a of the communication port portion 104 is in sliding contact with the surface of the first insulating plate 16a.

  In the first insulating plate 16a, a sealing groove 106 is formed around the oxidant gas inlet 50a at a position where the end face 104a of the communication port 104 is in sliding contact. A sealing member 108 is accommodated in the sealing groove 106, and the sealing member 108 constitutes a square surface seal.

  In the second embodiment configured as described above, the communication port portion 104 of the resin piping member 102 is inserted into the oxidant gas inlet manifold hole 56a of the first end plate 18a, and the communication port portion 104 A seal member 108 is interposed between the end face 104a and the first insulating plate 16a to have a desired sealing function. Therefore, this second embodiment can obtain the same effect as the first embodiment, and is good even if the shape of the communication hole (oxidant gas inlet communication hole 26a, etc.) is irregular. Sealability can be maintained.

  FIG. 6 is an explanatory cross-sectional view of a main part of a fuel cell stack 110 according to the third embodiment of the present invention.

  The resin piping member 112 constituting the fuel cell stack 110 is connected to the communication port 114 inserted into the oxidant gas inlet manifold hole 56a of the first end plate 18a and the oxidant gas inlet 50a of the first insulating plate 16a. The part 74 is provided integrally.

  On the outer periphery of the communication port portion 114, a groove portion 80 is formed on the tip side corresponding to the inner peripheral surface of the first insulating plate 16a, and an O-ring 82 is disposed in the groove portion 80. On the rear end side of the communication port portion 114, a groove portion 116 is formed corresponding to the inner peripheral surface of the first end plate 18a, and an aligning O-ring 118 is disposed in the groove portion 116.

  In the third embodiment configured as described above, the resin piping member 112 includes an O-ring 118 that is in sliding contact with the inner peripheral surface of the oxidant gas inlet manifold hole 56a of the first end plate 18a. The O-ring 118 can satisfactorily prevent the sealing O-ring 82 from being eccentric on the inner peripheral surface of the oxidant gas inlet 50a of the first insulating plate 16a. Thereby, the misalignment of the O-ring 82 is suppressed, and an effect that a desired sealing function can be surely obtained is obtained.

DESCRIPTION OF SYMBOLS 10, 100, 110 ... Fuel cell stack 12 ... Fuel cell 14a, 14b ... Terminal plate 16a, 16b ... Insulating plate 18a, 18b ... End plate 20 ... Electrolyte membrane electrode structure 22, 24 ... Separator 26a ... Oxidant gas inlet Communication hole 26b ... Oxidant gas outlet communication hole 28a ... Fuel gas inlet communication hole 28b ... Fuel gas outlet communication hole 30a ... Cooling medium inlet communication hole 30b ... Cooling medium outlet communication hole 32 ... Oxidant gas flow path 34 ... Fuel gas flow Path 36 ... Cooling medium flow path 42 ... Solid polymer electrolyte membrane 44 ... Cathode side electrode 46 ... Anode side electrode 50a ... Oxidant gas inlet 50b ... Oxidant gas outlet 52a ... Fuel gas inlet 52b ... Fuel gas outlet 54a ... Cooling medium Inlet 54b ... Cooling medium outlet 56a ... Oxidant gas inlet manifold hole 56b ... Oxidant gas outlet manifold Hold hole 58a ... Fuel gas inlet manifold hole 58b ... Fuel gas outlet manifold hole 60a ... Cooling medium inlet manifold hole 60b ... Cooling medium outlet manifold hole 64a, 64b, 66a, 66b, 68a, 68b, 102, 112 ... Resin piping member 70, 84a, 84b, 104, 114 ... Communication port 72 ... Pipe line 74, 88 ... Connection part 76, 90a, 90b ... Flange part 82, 96a, 96b, 118 ... O-ring 86 ... Main body part 108 ... Sealing member

Claims (4)

A plurality of fuel cells in which an electrolyte membrane / electrode structure provided with a pair of electrodes on both sides of the electrolyte membrane and a separator are stacked are stacked, and terminal plates, insulating plates, and end plates are disposed at both ends in the stacking direction. And at least one of the end plates is a fuel cell stack in which manifold holes for fluid supply or fluid discharge for flowing a cooling medium or reaction gas are formed,
A resin piping member that is attached to one of the end plates and supplies or discharges the cooling medium or the reaction gas to the fuel cell,
The resin piping member includes a communication port portion inserted into the manifold hole,
One of the end plates that protrudes to the outside, and a connecting portion to which a pipe line is connected,
As a single unit,
A fuel cell stack, wherein a seal member is interposed between an end of the communication port and the insulating plate.   2. The fuel cell stack according to claim 1, wherein the insulating plate is provided with the seal member around the communication hole communicating with the manifold hole at a position where the end surface of the communication port portion abuts. A fuel cell stack.   2. The fuel cell stack according to claim 1, wherein the seal member is provided between an inner peripheral surface of a communication hole provided in the insulating plate and communicating with the manifold hole, and an end surface of the communication port portion. A fuel cell stack characterized by being interposed.   The fuel cell stack according to any one of claims 1 to 3, wherein the seal is provided between an inner peripheral surface of the manifold hole of one end plate and an end peripheral surface of the communication port portion. A fuel cell stack, wherein members are interposed.

Images