JP6467329B2 - Fuel cell stack - Google Patents

Description

  The present invention has a power generation cell in which an electrolyte membrane / electrode structure having electrodes provided on both surfaces of an electrolyte membrane and a separator are stacked, and a plurality of the power generation cells are stacked and end plates are arranged at both ends in the stacking direction. The present invention relates to a fuel cell stack.

  For example, a polymer electrolyte fuel cell has an electrolyte membrane / electrode structure (MEA) in which an anode electrode is disposed on one surface of an electrolyte membrane made of a polymer ion exchange membrane and a cathode electrode is disposed on the other surface. It has. The electrolyte membrane / electrode structure is sandwiched between separators to constitute a power generation cell (unit cell). Usually, a predetermined number of power generation cells are stacked, and for example, they are incorporated in a fuel cell vehicle (fuel cell electric vehicle or the like) as an in-vehicle fuel cell stack.

  In the fuel cell stack, a fuel gas channel for flowing fuel gas to the anode electrode and an oxidant gas channel for flowing oxidant gas to the cathode electrode are provided in the plane of the separator. Further, between the separators of the power generation cells adjacent to each other, a cooling medium flow path for flowing the cooling medium is provided along the surface direction of the separator.

  Further, an internal manifold type fuel provided with a fuel gas communication hole through which fuel gas flows in the stacking direction, an oxidant gas communication hole through which oxidant gas flows, and a cooling medium communication hole through which a cooling medium flows. A battery stack is used. The fuel gas communication hole (fluid communication hole) has a fuel gas supply communication hole and a fuel gas discharge communication hole, and the oxidant gas communication hole (fluid communication hole) has an oxidant gas supply communication hole and an oxidant gas discharge communication. It has a hole. The cooling medium communication hole (fluid communication hole) has a cooling medium supply communication hole and a cooling medium discharge communication hole.

  In the fuel cell stack, at least one end plate is provided with a fluid manifold that supplies or discharges a fluid that is a fuel gas, an oxidant gas, or a cooling medium, connected to each fluid communication hole. For example, in the fuel cell stack disclosed in Patent Document 1, a resin manifold is provided on one end plate, and a reinforcing portion held by the one end plate is provided at an end of the resin manifold. Is provided.

  In the fuel cell stack disclosed in Patent Document 2, the fluid manifold has a rubber main body. The rubber body is integrally provided with a rubber flange at the joint with the end plate, and the rubber flange is pressed against the end plate by a metal stopper fixed to the end plate. Has been.

JP 2009-224195 A Japanese Patent Laying-Open No. 2015-60716

  The present invention has been made in connection with this type of technology, and can suppress damage to the resin fluid manifold as much as possible, so that the resin fluid manifold can be used favorably and economically. An object is to provide a possible fuel cell stack.

  A fuel cell stack according to the present invention has a power generation cell in which an electrolyte membrane / electrode structure having electrodes provided on both sides of an electrolyte membrane and a separator are stacked, and a plurality of the power generation cells are stacked to form both ends in the stacking direction. An end plate is disposed on the end plate. One end plate is provided with a resin fluid manifold through which a fluid that is a cooling medium, fuel gas, or oxidant gas flows.

  The fuel cell stack is inserted into the hole formed in the resin fluid manifold, the cylindrical collar member disposed in the hole, the cylindrical collar member, and screwed into one end plate. Fastening bolts. A plurality of protrusions that support the outer peripheral surface of the cylindrical collar member are provided on the inner peripheral surface of the hole so as to protrude radially inward.

  Further, in this fuel cell stack, it is preferable that three or more protrusions be provided on the inner peripheral surface of the hole portion at regular angular intervals.

  According to the present invention, the outer peripheral surface of the cylindrical collar member is supported by a plurality of protrusions provided on the inner peripheral surface of the hole portion by point contact or line contact. For this reason, an excessive stress does not act on the resin fluid manifold, which is a different material, and, for example, a metal cylindrical collar member due to a difference in linear expansion accompanying a temperature change.

  Accordingly, it is possible to suppress the occurrence of cracks in the resin fluid manifold. Thereby, damage to the resin fluid manifold can be suppressed as much as possible, and the resin fluid manifold can be used satisfactorily and economically.

It is a perspective explanatory view from the 2nd end plate side of the fuel cell stack concerning the embodiment of the present invention. It is a partially exploded perspective view from the 1st end plate side of the said fuel cell stack. It is a principal part disassembled perspective explanatory drawing of the electric power generation cell which comprises the said fuel cell stack. FIG. 3 is an exploded perspective view of a cooling medium supply manifold that constitutes the fuel cell stack. It is front explanatory drawing of the manifold cover member which comprises the said cooling-medium supply manifold. FIG. 5 is a cross-sectional view of the cooling medium supply manifold and the second end plate taken along line VI-VI in FIG. 4. FIG. 5 is a cross-sectional view of the cooling medium supply manifold and the second end plate taken along line VII-VII in FIG. 4.

  As shown in FIGS. 1 and 2, a fuel cell stack 10 according to an embodiment of the present invention is mounted on, for example, a fuel cell electric vehicle (not shown). The fuel cell stack 10 includes a stacked body 12as in which a plurality of power generation cells 12 are stacked in the horizontal direction (arrow B direction) with the electrode surface in an upright posture (see FIG. 2). In the fuel cell stack 10, a plurality of power generation cells 12 may be stacked in the direction of gravity (arrow C direction).

  As shown in FIG. 2, a first terminal plate 14a, a first insulating plate 16a, and a first end plate 18a are sequentially provided outward at one end in the stacking direction of the power generation cell 12 (one end of the stacked body 12as). Arranged. A second terminal plate 14b, a second insulating plate 16b, and a second end plate 18b are sequentially disposed outward at the other end in the stacking direction of the power generation cell 12 (the other end of the stacked body 12as). .

  The first power output terminal 20a connected to the first terminal plate 14a faces outward from a substantially central portion (which may be eccentric from the central portion) of the horizontally long (rectangular) first end plate 18a. Extend. The second power output terminal 20b connected to the second terminal plate 14b is directed outward from a substantially central portion (which may be eccentric from the central portion) of the horizontally long (rectangular) second end plate 18b. Extend.

  Between both sides of the first end plate 18a and the second end plate 18b, both ends of the connecting bar 22 are fixed by screws 24, and a plurality of stacked power generation cells 12 are subjected to a tightening load in the stacking direction (arrow B direction). Give.

  The fuel cell stack 10 includes a casing 26 as necessary. The casing 26 is constituted by the first end plate 18a and the second end plate 18b at two sides (surfaces) at both ends in the arrow B direction. Two sides (surfaces) at both ends in the arrow A direction of the casing 26 are constituted by a horizontally elongated plate-shaped first side panel 28a and second side panel 28b. Two sides (surfaces) at both ends in the height direction (arrow C direction) of the casing 26 are constituted by an upper side panel 30a and a lower side panel 30b. The upper side panel 30a and the lower side panel 30b have a horizontally long plate shape.

  As shown in FIG. 2, the first end plate 18a and the second end plate 18b are provided with screw holes 32 on each side. Holes 34 are formed in the first side panel 28a, the second side panel 28b, the upper side panel 30a, and the lower side panel 30b so as to face the screw holes 32. The screws 36 inserted into the holes 34 are screwed into the screw holes 32, so that the casing 26 is fixed integrally.

  As shown in FIG. 3, the power generation cell 12 includes an electrolyte membrane / electrode structure 40, and a cathode separator 42 and an anode separator 44 that sandwich the electrolyte membrane / electrode structure 40.

  The cathode separator 42 and the anode separator 44 are made of, for example, a steel plate, a stainless steel plate, an aluminum plate, a plated steel plate, or a metal plate whose surface is subjected to anticorrosion treatment. The cathode separator 42 and the anode separator 44 have a rectangular planar shape, and are formed into a concavo-convex shape by pressing a metal thin plate into a wave shape. For example, a carbon separator may be used as the cathode separator 42 and the anode separator 44 instead of the metal separator.

  An oxidant gas supply communication hole 46a and a fuel gas discharge communication hole 48b are provided at one end edge of the power generation cell 12 in the long side direction (arrow A direction) so as to communicate with each other in the arrow B direction. The oxidant gas supply communication hole 46a supplies an oxidant gas (fluid), for example, an oxygen-containing gas, while the fuel gas discharge communication hole 48b discharges a fuel gas (fluid), for example, a hydrogen-containing gas.

  The other end edge in the long side direction of the power generation cell 12 communicates with each other in the direction of arrow B, and a fuel gas supply communication hole 48a for supplying fuel gas, and an oxidant gas for discharging oxidant gas. A discharge communication hole 46b is provided.

  The cooling medium is supplied to one side (one end in the horizontal direction) of both ends in the short side direction (arrow C direction) of the power generation cell 12, that is, to the oxidant gas supply communication hole 46a and the fuel gas discharge communication hole 48b side. Communication holes 50a are provided at the top and bottom. The cooling medium supply communication holes 50a communicate with each other in the direction of arrow B in order to supply a cooling medium (fluid), and are provided one above and below (or two) on the opposite sides.

  Cooling medium discharge communication holes 50b are provided on the other side (the other end in the horizontal direction) of both ends in the short side direction of the power generation cell 12, that is, on the fuel gas supply communication hole 48a and oxidant gas discharge communication hole 46b side. Provided at the top and bottom. The cooling medium discharge communication holes 50b communicate with each other in the direction of arrow B in order to discharge the cooling medium, and are provided one by one on the upper and lower sides (two may be provided).

  The electrolyte membrane / electrode structure 40 includes, for example, a solid polymer electrolyte membrane 52 in which a perfluorosulfonic acid thin film is impregnated with water, and a cathode electrode 54 and an anode electrode 56 that sandwich the solid polymer electrolyte membrane 52. Prepare.

  The cathode electrode 54 and the anode electrode 56 have a gas diffusion layer (not shown) made of carbon paper or the like. The porous carbon particles carrying the platinum alloy on the surface are uniformly applied to the surface of the gas diffusion layer, thereby forming an electrode catalyst layer (not shown). The electrode catalyst layers are formed on both surfaces of the solid polymer electrolyte membrane 52.

  An oxidant gas flow path 58 that connects the oxidant gas supply communication hole 46a and the oxidant gas discharge communication hole 46b is formed on the surface 42a of the cathode separator 42 facing the electrolyte membrane / electrode structure 40. The oxidant gas channel 58 is formed by a plurality of wavy channel grooves (or linear channel grooves) extending in the direction of arrow A.

  A fuel gas flow path 60 that connects the fuel gas supply communication hole 48 a and the fuel gas discharge communication hole 48 b is formed on the surface 44 a of the anode separator 44 facing the electrolyte membrane / electrode structure 40. The fuel gas channel 60 is formed by a plurality of wavy channel grooves (or linear channel grooves) extending in the direction of arrow A.

  Between the surface 44b of the anode separator 44 and the surface 42b of the cathode separator 42 adjacent to each other, a cooling medium flow path 62 communicating with the cooling medium supply communication holes 50a, 50a and the cooling medium discharge communication holes 50b, 50b is formed. Is done. The cooling medium flow path 62 extends in the horizontal direction and allows the cooling medium to flow over the electrode range of the electrolyte membrane / electrode structure 40.

  A first seal member 64 is integrally formed on the surfaces 42 a and 42 b of the cathode separator 42 around the outer peripheral edge of the cathode separator 42. A second seal member 66 is integrally formed on the surfaces 44 a and 44 b of the anode separator 44 around the outer peripheral edge of the anode separator 44.

  As the first seal member 64 and the second seal member 66, for example, EPDM, NBR, fluorine rubber, silicone rubber, fluorosilicone rubber, butyl rubber, natural rubber, styrene rubber, chloroprene or acrylic rubber or the like, cushion material Alternatively, an elastic seal member such as a packing material is used.

  As shown in FIG. 2, an oxidant gas supply manifold 68a, an oxidant gas discharge manifold 68b, a fuel gas supply manifold 70a, and a fuel gas discharge manifold 70b are attached to the first end plate 18a. The oxidant gas supply manifold 68a, the oxidant gas discharge manifold 68b, the fuel gas supply manifold 70a, and the fuel gas discharge manifold 70b are made of an electrically insulating resin.

  The oxidant gas supply manifold 68a and the oxidant gas discharge manifold 68b communicate with the oxidant gas supply communication hole 46a and the oxidant gas discharge communication hole 46b. The fuel gas supply manifold 70a and the fuel gas discharge manifold 70b communicate with the fuel gas supply communication hole 48a and the fuel gas discharge communication hole 48b.

  As shown in FIG. 1, the second end plate (one end plate) 18b has a resin-made cooling medium supply manifold (resin fluid manifold) 72a communicating with one cooling medium supply communication hole 50a in the vertical direction. Is attached. A resin-made cooling medium discharge manifold (resin fluid manifold) 72b is attached to the second end plate 18b so as to communicate with one cooling medium discharge communication hole 50b in the vertical direction. The cooling medium supply manifold 72a and the cooling medium discharge manifold 72b preferably have electrical insulation.

  As shown in FIGS. 1 and 4, the cooling medium supply manifold 72a includes a manifold base member 74a that abuts against the second end plate 18b. The manifold base member 74a is fixed to the manifold cover member 76a, and the manifold cover member 76a is attached to the second end plate 18b. In the second end plate 18b, four screw holes 77a are formed in the vicinity of each cooling medium supply communication hole 50a, and four screw holes 77b in the vicinity of each cooling medium discharge communication hole 50b. Is formed (see FIG. 1).

  The manifold base member 74a has a substantially flat plate shape, and a cooling medium inlet 78a that communicates integrally with the cooling medium supply communication hole 50a is provided at the upper and lower portions of the manifold base member 74a. A circumferential groove 80a surrounding the upper and lower cooling medium inlets 78a is formed on the surface of the manifold base member 74a toward the manifold cover member 76a. A sealing member 82a is disposed in the circumferential groove 80a, and a circumferential groove (not shown) is formed on the opposite surface of the manifold base member 74a or the surface of the second end plate 18b as necessary. 82a is arranged.

  The seal member 82a is set to a relatively large size in the thickness direction (the stacking direction of the manifold base member 74a and the manifold base member 74a). This is because when a gap is generated between the manifold base member 74a and the second end plate 18b and between the manifold base member 74a and the manifold cover member 76a, the leakage of the cooling medium is surely suppressed.

  In the upper part of the manifold base member 74a, two hole portions 84a are formed at both corners, one above the other. In the lower portion of the manifold base member 74a, two hole portions 84a are formed at both corners, one above the other. Each hole 84a is disposed coaxially with each screw hole 77a of the second end plate 18b. Two upper and lower metal female screw members 86a are embedded in the center portion of the manifold base member 74a at substantially the center in the height direction (arrow C direction), respectively, on both sides in the arrow A direction.

  As shown in FIGS. 4 and 5, the manifold cover member 76a has a housing-like main body portion 88a that forms a cooling medium flow passage 87a communicating with the upper and lower cooling medium inlets 78a of the manifold base member 74a. An inlet pipe portion 90a, which is a cooling medium supply port, is provided in a substantially central portion in the height direction of the main body portion 88a in the horizontal direction. A flange portion 92a is provided on the outer peripheral edge portion of the main body portion 88a.

  In the upper part of the flange portion 92a, two hole portions 94a are formed at both corners in the vertical direction. In the lower portion of the flange portion 92a, two hole portions 94a are formed at both corners, one above the other. At substantially the center in the height direction (arrow C direction) of the flange portion 92a, two hole portions 96a are formed on the both sides in the arrow A direction, two vertically. The hole portion 94a of the flange portion 92a is disposed coaxially with the hole portion 84a of the manifold base member 74a, while the hole portion 96a of the flange portion 92a is coaxial with the metal female screw member 86a of the manifold base member 74a. Formed on top.

  As shown in FIG. 5, a plurality of, for example, four protrusions 100 a are provided on the inner peripheral surface 98 a of the hole 94 a so as to protrude radially inwardly at equal angular intervals. In addition, the protrusion part 100a should just support the outer peripheral surface 106as of the cylindrical collar member 106a mentioned later, Preferably it should just be 3 or more. Moreover, the protrusion part 100a should just have predetermined | prescribed length in the axial direction of the internal peripheral surface 98a, and does not need to be provided over the axial direction full length.

  A plurality of, for example, four protrusions 104a are provided on the inner peripheral surface 102a of the hole 96a so as to protrude inward in the radial direction with an equal angular interval. In addition, the protrusion part 104a should just support the outer peripheral surface 110as of the cylindrical collar member 110a mentioned later, Preferably it should just be 3 or more. Moreover, the protrusion part 104a should just have predetermined | prescribed length in the axial direction of the internal peripheral surface 102a, and does not need to be provided over the axial direction full length.

  As shown in FIG. 4, for example, a metal cylindrical collar member 106 a is disposed in each hole 94 a. As shown in FIG. 6, the axial length of the cylindrical collar member 106a is set so that the end of the cylindrical collar member 106a is inserted into the hole 84a from the hole 94a and comes into contact with the plate surface of the second end plate 18b. .

  In the cylindrical collar member 106a, the outer peripheral surface 106as is supported by the four protrusions 100a, and the flange portion 106af abuts on the flange portion 92a. A fastening bolt (hexagonal bolt) 108a is inserted into the cylindrical collar member 106a, and the fastening bolt 108a is screwed into the screw hole 77a, whereby the cooling medium supply manifold 72a is fixed to the second end plate 18b.

  As shown in FIG. 4, each hole 96a is provided with, for example, a metal cylindrical collar member 110a. As shown in FIG. 7, the axial length of the cylindrical collar member 110a is set such that the cylindrical collar member 110a is inserted into the hole portion 96a and the tip thereof comes into contact with the end surface of the female screw member 86a of the manifold base member 74a.

  In the cylindrical collar member 110a, the outer peripheral surface 110as is supported by the four protruding portions 104a, and the flange portion 110af abuts on the flange portion 92a. A fastening bolt (hexagonal bolt) 112a is inserted into the cylindrical collar member 110a, and the fastening bolt 112a is screwed into the female screw member 86a, whereby the manifold cover member 76a is fixed to the manifold base member 74a.

  As shown in FIG. 1, the cooling medium discharge manifold 72b is fixed to the second end plate 18b. In the cooling medium discharge manifold 72b, the same components as those in the cooling medium supply manifold 72a are denoted by the same reference numeral b instead of a, and detailed description thereof will be omitted.

  A cooling medium outlet (fluid communication hole) 78b that communicates integrally with the cooling medium discharge communication hole 50b is provided at the upper and lower portions of the cooling medium discharge manifold 72b. In the cooling medium discharge manifold 72b, an outlet pipe portion 90b that is a cooling medium discharge port is provided in the horizontal direction at a substantially central portion in the height direction of the main body portion 88b constituting the manifold cover member 76b.

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

  First, as shown in FIG. 2, an oxidizing gas such as an oxygen-containing gas is supplied from the oxidizing gas supply manifold 68a of the first end plate 18a to the oxidizing gas supply communication hole 46a. A fuel gas such as a hydrogen-containing gas is supplied from the fuel gas supply manifold 70a of the first end plate 18a to the fuel gas supply communication hole 48a.

  Further, as shown in FIG. 1, in the second end plate 18b, pure water, ethylene glycol, oil, or the like is passed from the inlet pipe section 90a of the cooling medium supply manifold 72a to the cooling medium flow path 87a in the main body section 88a. A cooling medium is supplied. The cooling medium is distributed to each cooling medium supply communication hole 50a that communicates with the cooling medium flow path 87a in the vertical direction.

  Therefore, as shown in FIG. 3, the oxidant gas is introduced into the oxidant gas flow path 58 of the cathode separator 42 from the oxidant gas supply communication hole 46a. The oxidant gas moves in the direction of arrow A along the oxidant gas flow path 58 and is supplied to the cathode electrode 54 of the electrolyte membrane / electrode structure 40.

  On the other hand, the fuel gas is supplied to the fuel gas channel 60 of the anode separator 44 from the fuel gas supply communication hole 48a. The fuel gas moves in the direction of arrow A along the fuel gas flow path 60 and is supplied to the anode electrode 56 of the electrolyte membrane / electrode structure 40.

  Therefore, in the electrolyte membrane / electrode structure 40, the oxidizing gas supplied to the cathode electrode 54 and the fuel gas supplied to the anode electrode 56 are consumed by an electrochemical reaction in the electrode catalyst layer to generate power. Is called.

  Next, the oxidant gas consumed by being supplied to the cathode electrode 54 of the electrolyte membrane / electrode structure 40 is discharged in the direction of arrow B along the oxidant gas discharge communication hole 46b. On the other hand, the fuel gas supplied to and consumed by the anode electrode 56 of the electrolyte membrane / electrode structure 40 is discharged in the direction of arrow B along the fuel gas discharge communication hole 48b.

  The cooling medium supplied to the upper and lower cooling medium supply communication holes 50 a is introduced into the cooling medium flow path 62 between the cathode separator 42 and the anode separator 44 adjacent to each other. The cooling medium once flows from the upper and lower cooling medium supply communication holes 50a in directions close to each other, that is, along the inward direction of the arrow C, and then moves in the direction of the arrow A to move the electrolyte membrane / electrode structure 40. Cooling. The cooling medium moves in the direction away from each other in the direction of arrow C, and is then discharged in the direction of arrow B along the upper and lower cooling medium discharge communication holes 50b.

  As shown in FIG. 1, the cooling medium is discharged from the cooling medium discharge communication holes 50b in the upper and lower portions to the cooling medium flow passage 87b in the main body 88b of the cooling medium discharge manifold 72b. The cooling medium flows to the center side of the main body portion 88b and is then discharged to the outside from the outlet pipe portion 90b.

  In this case, in the present embodiment, as shown in FIGS. 4 to 6, holes 84a and 94a are formed in the manifold base member 74a and the manifold cover member 76a constituting the cooling medium supply manifold 72a. A cylindrical collar member 106a is integrally inserted into the holes 84a and 94a. At that time, the outer peripheral surface 106as of the cylindrical collar member 106a is point-contacted with a plurality of protrusions 100a that protrude radially inwardly from the inner peripheral surface 98a of the hole 94a and are spaced apart at equal angular intervals. Or it is supported by line contact.

  For this reason, excessive stress does not act on the resin-made cooling medium supply manifold 72a and the metallic cylindrical collar member 106a, which are different materials, due to a difference in linear expansion accompanying a temperature change. .

  Accordingly, it is possible to suppress the occurrence of cracks in the cooling medium supply manifold 72a, which is a resin product. Thereby, damage to the cooling medium supply manifold 72a can be suppressed as much as possible, and the effect that the cooling medium supply manifold 72a can be used satisfactorily and economically is obtained. On the other hand, the cooling medium discharge manifold 72b is configured in the same manner as the cooling medium supply manifold 72a, and the same effect can be obtained.

  Further, as shown in FIGS. 4, 5 and 7, a hole 96a is formed in the manifold cover member 76a constituting the cooling medium supply manifold 72a, and a cylindrical collar member 110a is formed in the hole 96a. Has been inserted. At that time, the outer peripheral surface 110as of the cylindrical collar member 110a is point-contacted with a plurality of protrusions 104a protruding radially inwardly from the inner peripheral surface 102a of the hole 96a and spaced apart at equal angular intervals. Supported by line contact.

  For this reason, excessive stress does not act on the manifold cover member 76a made of resin, which is a different material, and the cylindrical collar member 110a made of metal due to a difference in linear expansion due to temperature change.

  In the present embodiment, the cooling medium supply manifold 72a is individually configured by the manifold base member 74a and the manifold cover member 76a, but is not limited thereto. For example, the cooling medium supply manifold 72a may be configured as a single component by integrally forming the manifold base member 74a and the manifold cover member 76a. On the other hand, the cooling medium discharge manifold 72b may be similarly configured as a single component. Further, the present invention is not limited to the cooling medium, and can be applied to a reaction gas supply manifold and a reaction gas discharge manifold that are fuel gas and oxidant gas.

DESCRIPTION OF SYMBOLS 10 ... Fuel cell stack 12 ... Power generation cell 12as ... Laminated body 18a, 18b ... End plate 26 ... Casing 40 ... Electrolyte membrane and electrode structure 42 ... Cathode separator 44 ... Anode separator 46a ... Oxidant gas supply communication hole 46b ... Oxidant Gas discharge communication hole 48a ... Fuel gas supply communication hole 48b ... Fuel gas discharge communication hole 50a ... Cooling medium supply communication hole 50b ... Cooling medium discharge communication hole 52 ... Solid polymer electrolyte membrane 54 ... Cathode electrode 56 ... Anode electrode 58 ... Oxidation Agent gas flow path 60 ... Fuel gas flow path 62 ... Cooling medium flow path 68a ... Oxidant gas supply manifold 68b ... Oxidant gas discharge manifold 70a ... Fuel gas supply manifold 70b ... Fuel gas discharge manifold 72a ... Cooling medium supply manifold 72b ... Cooling medium discharge manifold 74a ... Maniho Yield base members 76a, 76b ... Manifold cover members 77a, 77b ... Screw holes 78a ... Cooling medium inlet 82a ... Seal members 84a, 94a, 96a ... Holes 86a ... Female screw members 87a, 87b ... Cooling medium flow passages 88a, 88b ... Main body 92a ... Flange 98a, 102a ... Inner peripheral surface 100a, 104a ... Projection 106a, 110a ... Cylindrical collar member 106as, 110as ... Outer peripheral surface 108a, 112a ... Fastening bolt

Claims (2)

A power generation cell in which an electrolyte membrane / electrode structure having electrodes provided on both sides of the electrolyte membrane and a separator are stacked, and a plurality of the power generation cells are stacked and end plates are disposed at both ends in the stacking direction. The one end plate is a fuel cell stack provided with a resin fluid manifold for circulating a fluid that is a cooling medium, a fuel gas or an oxidant gas,
A hole formed in the resin fluid manifold;
A cylindrical collar member disposed in the hole;
A fastening bolt inserted into the cylindrical collar member and screwed into the one end plate;
With
A fuel cell stack, wherein a plurality of protrusions that support the outer peripheral surface of the cylindrical collar member are provided on the inner peripheral surface of the hole so as to protrude radially inward.   2. The fuel cell stack according to claim 1, wherein three or more protrusions are provided at equal angular intervals on the inner peripheral surface of the hole. 3.

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