JP2014038723A - Fuel cell stack - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fuel cell stack that simplifies handling of components and that favorably improves assembly workability.SOLUTION: A fuel cell stack 10 has a terminal plate 16b, an insulating member 18b, and an end plate 20b, disposed at one end of a laminate 14 that has a plurality of laminated power generation cells 12. The insulating member 18b is provided with a depression 68 that houses a heat insulating member 70 and the terminal plate 16b. Resin pin members 72 are inserted in respective stepped holes 69 in the insulating member 18b and respective holes 52 in a power generation cell 12, and the insulating member 18b and the power generation cell 12are thus held integrally.

Description

  The present invention includes a power generation cell having an electrolyte / electrode structure in which electrodes are arranged on both sides of an electrolyte and a separator, and a terminal plate on both sides in a stacking direction of the stacked body in which a plurality of the power generation cells are stacked. The present invention relates to a fuel cell stack in which an insulating member and an end plate are disposed.

  For example, a solid polymer fuel cell employs a solid polymer electrolyte membrane made of a polymer ion exchange membrane. This fuel cell comprises an electrolyte membrane / electrode structure in which an anode electrode and a cathode electrode each having an electrode catalyst (electrode catalyst layer) and porous carbon (gas diffusion layer) are disposed on both sides of a solid polymer electrolyte membrane ( A power generation cell is formed in which the MEA is sandwiched between separators (bipolar plates).

  In many cases, a fuel cell stack having a stack in which a predetermined number of power generation cells are stacked is provided, and a terminal plate, an insulating plate, and an end plate are disposed on both sides of the stack in the stacking direction. This type of fuel cell stack is used as, for example, an in-vehicle fuel cell stack mounted on a fuel cell electric vehicle.

  For example, in Patent Document 1, a terminal plate, an insulating plate, and an end plate are penetrated in the stacking direction to form a through hole, and a fastening means is inserted into the through hole, whereby the terminal plate, the insulating plate, A technique for integrating a plate and the end plate is disclosed.

  Thereby, while maintaining durability of a terminal plate, an insulating plate, and an end plate, these can be thinned and it becomes possible to achieve size reduction and weight reduction of the whole fuel cell stack.

Japanese Patent No. 4776886

  By the way, in the fuel cell stack, for example, a technique of interposing a dummy cell (non-power generation cell) or a heat insulating member configured similarly to the power generation cell as a heat insulating structure between the end of the laminate and the terminal plate is adopted. Has been. For this reason, there are problems that the number of parts is considerably increased and handling becomes complicated, and the assembly workability of the fuel cell stack is lowered.

  The present invention solves this type of problem, and an object thereof is to provide a fuel cell stack capable of simplifying the handling of components and improving the assembly workability satisfactorily.

  The present invention includes a power generation cell having an electrolyte / electrode structure in which electrodes are arranged on both sides of an electrolyte and a separator, and a terminal plate on both sides in a stacking direction of the stacked body in which a plurality of the power generation cells are stacked. The present invention relates to a fuel cell stack in which an insulating member and an end plate are disposed.

  And at least one insulation member provides the recessed part by which the edge part by the side of a laminated body is opened, and while the conductive heat insulation member is accommodated in the recessed part, the one insulation with which the conductive heat insulation member was accommodated The member integrally holds at least one power generation cell constituting the end of the laminate by a holding member.

  Further, in this fuel cell stack, the holding member is a resin pin member, and the resin pin member is integrally inserted into one insulating member and at least one power generation cell, and the end thereof is heat staking. Preferably it is processed.

  Further, in this fuel cell stack, the terminal plate is preferably disposed in contact with the bottom surface in the recess.

  According to the present invention, the insulating member and at least one power generation cell are integrally held by the holding member in a state where the conductive heat insulating member is accommodated in the recess of the insulating member. For this reason, compared with the case where each component is handled individually, the number of handling components is reduced. This simplifies the handling of components and improves the assembly workability.

1 is a partially exploded schematic perspective view of a fuel cell stack according to a first embodiment of the present invention. FIG. 2 is a cross-sectional view of the fuel cell stack taken along line II-II in FIG. 1. It is a disassembled perspective explanatory drawing of the power generation cell which comprises the said fuel cell stack. It is a disassembled perspective explanatory drawing of the electric power generation cell arrange | positioned at the edge part of the said fuel cell stack. 6 is a partial cross-sectional view of a fuel cell stack according to a second embodiment of the present invention. FIG. FIG. 5 is a partially exploded schematic perspective view of a fuel cell stack according to a third embodiment of the present invention. FIG. 7 is a cross-sectional view of the fuel cell stack taken along line VII-VII in FIG. 6. It is a disassembled perspective explanatory drawing of the power generation cell which comprises the said fuel cell stack.

  As shown in FIGS. 1 and 2, the fuel cell stack 10 according to the first embodiment of the present invention includes a stacked body 14 in which a plurality of power generation cells 12 are stacked in the horizontal direction (arrow A direction).

  A terminal plate 16a, an insulating plate (insulating member) 18a, and an end plate 20a are sequentially disposed at one end in the stacking direction (arrow A direction) of the stacked body 14 (see FIG. 1). At the other end in the stacking direction of the stacked body 14, a terminal plate 16b, an insulating member 18b, and an end plate 20b are sequentially disposed outward.

  The fuel cell stack 10 is, for example, integrally held by a box-like casing (not shown) including end plates 20a, 20b configured in a rectangular shape as end plates, or a plurality of tie rods extending in the direction of arrow A (Not shown) are integrally clamped and held.

  As shown in FIGS. 2 and 3, the power generation cell 12 includes an electrolyte membrane / electrode structure 22, and a first metal separator 24 and a second metal separator 26 that sandwich the electrolyte membrane / electrode structure 22. The first metal separator 24 and the second metal separator 26 are formed by, for example, pressing a corrugated metal sheet, a stainless steel sheet, an aluminum sheet, a plated steel sheet, or a thin metal sheet having a surface treatment for corrosion prevention on the metal surface thereof. However, for example, a carbon separator may be used.

  The electrolyte membrane / electrode structure 22 includes, for example, a solid polymer electrolyte membrane 28 in which a perfluorosulfonic acid thin film is impregnated with water, and an anode electrode 30 and a cathode electrode 32 sandwiching the solid polymer electrolyte membrane 28. Prepare. The solid polymer electrolyte membrane 28 has a larger surface area than the anode electrode 30 and the cathode electrode 32.

  The electrolyte membrane / electrode structure 22 may constitute a step MEA in which the anode electrode 30 and the cathode electrode 32 are set to have different surface areas.

  The anode electrode 30 and the cathode electrode 32 are formed by uniformly applying a gas diffusion layer (not shown) made of carbon paper or the like and porous carbon particles carrying a platinum alloy on the surface thereof to the surface of the gas diffusion layer. And an electrode catalyst layer (not shown) to be formed. The electrode catalyst layers are formed on both surfaces of the solid polymer electrolyte membrane 28.

  One end edge of the power generation cell 12 in the direction of arrow B (the horizontal direction in FIG. 3) communicates with each other in the direction of arrow A, which is the stacking direction, and oxidant for supplying an oxidant gas, for example, an oxygen-containing gas An agent gas inlet communication hole 34a, a cooling medium inlet communication hole 36a for supplying a cooling medium, and a fuel gas outlet communication hole 38b for discharging a fuel gas, for example, a hydrogen-containing gas, are provided in an arrow C direction (vertical direction). Are provided in an array.

  The other end edge of the power generation cell 12 in the direction of arrow B communicates with each other in the direction of arrow A, a fuel gas inlet communication hole 38a for supplying fuel gas, and a cooling medium outlet communication hole for discharging the cooling medium. 36 b and an oxidant gas outlet communication hole 34 b for discharging the oxidant gas are arranged in the direction of arrow C.

  On the surface 24 a of the first metal separator 24 facing the electrolyte membrane / electrode structure 22, for example, a fuel gas channel 40 extending in the arrow B direction is formed. The fuel gas passage 40 communicates with the fuel gas inlet communication hole 38a and the fuel gas outlet communication hole 38b.

  On the surface 26 a of the second metal separator 26 facing the electrolyte membrane / electrode structure 22, for example, an oxidant gas channel 42 extending in the direction of arrow B is provided. The oxidant gas flow path 42 communicates with the oxidant gas inlet communication hole 34a and the oxidant gas outlet communication hole 34b.

  A cooling medium flow path 44 communicating with the cooling medium inlet communication hole 36a and the cooling medium outlet communication hole 36b is formed between the surface 24b of the first metal separator 24 and the surface 26b of the second metal separator 26 adjacent to each other. Is done. The cooling medium flow path 44 is formed by overlapping the back surface shape of the fuel gas flow path 40 and the back surface shape of the oxidant gas flow path 42.

  As shown in FIGS. 2 and 3, the first seal member 48 is integrated with the surfaces 24 a and 24 b of the first metal separator 24 around the outer periphery of the first metal separator 24. The second seal member 50 is integrated with the surfaces 26 a and 26 b of the second metal separator 26 around the outer peripheral end of the second metal separator 26.

  The first seal member 48 and the second seal member 50 include, for example, EPDM, NBR, fluorine rubber, silicone rubber, fluorosilicone rubber, butyl rubber, natural rubber, styrene rubber, chloroprene or acrylic rubber, and cushioning materials. Alternatively, an elastic seal member such as a packing material is used.

FIG. 4 shows at least one power generation cell 12 _end disposed at at least one end of the stacked body 14, in the first embodiment, at an end close to the insulating member 18 b side. The power generation cell 12 _end is configured in the same manner as the power generation cell 12 except that holes 52 are provided at four corners (one diagonal position, that is, two positions may be provided).

  As shown in FIG. 1, terminal portions 58a and 58b extending outward in the stacking direction are provided at substantially the center of the terminal plates 16a and 16b. The terminal portions 58a and 58b are inserted into the insulating cylinder 60 and penetrate through the holes 62a and 62b of the insulating plate 18a and the insulating member 18b and the holes 64a and 64b of the end plates 20a and 20b. , 20b protrudes outside.

  The insulating plate 18a and the insulating member 18b are formed of an insulating material such as polycarbonate (PC) or phenol resin. The insulating plate 18a is provided with a rectangular groove 66a at the center, and the hole 62a communicates with the approximate center of the groove 66a. The groove 66a accommodates the terminal plate 16a, and the terminal 58a of the terminal plate 16a is inserted into the hole 62a with the insulating cylinder 60 interposed.

The insulating member 18b is configured to be thicker than the insulating plate 18a, and has a recess 68 in which an end on the laminated body 14 side is opened. A hole 62b communicates with the approximate center of the bottom surface 68a constituting the recess 68. Stepped holes 69 are provided at the four corners of the insulating member 18b coaxially with the respective holes 52 of the power generation cell _{12end in} the stacking direction.

  The recessed portion 68 accommodates the conductive heat insulating member 70 and the terminal plate 16b, and the terminal portion 58b of the terminal plate 16b is inserted into the hole portion 62b with the insulating cylindrical body 60 interposed therebetween.

  The terminal plate 16b is disposed in contact with the bottom surface 68a of the recess 68, but is not limited to this. The heat insulating member 70 is in contact with the bottom surface 68a and is opposite to the bottom surface 68a of the heat insulating member 70. The terminal plate 16b may be brought into contact with the surface. At that time, a hole portion in which the terminal portion 58 b is inserted through the insulating cylindrical body 60 is formed in the center of the heat insulating member 70.

  The heat insulating member 70 includes a corrugated metal plate 24P obtained by cutting the outer periphery of the first metal separator 24 having electric conductivity constituting the power generation cell 12 (laminated body 14) into a frame shape, and a first electrode having electric conductivity. For example, two sets of corrugated metal plates 26P obtained by cutting the outer periphery of the two metal separators 26 into a frame shape are alternately stacked. In the heat insulating member 70, when the metal plates 24P and 26P are in contact with each other, a heat insulating space is formed between them. In addition, when the power generation cell 12 is composed of three different types of separators, three separators may be alternately stacked.

  Specifically, as shown in FIGS. 1 and 2, the metal plate 24P may be formed by cutting the outer periphery of the first metal separator 24 along the inner periphery of the first seal member 48. The outer peripheral dimension is set to be equal to the inner peripheral dimension of the recess 68 of the insulating member 18b. The metal plate 26P only needs to cut the outer peripheral portion of the second metal separator 26 along the inner periphery of the second seal member 50. The outer peripheral size of the metal plate 26P is equal to the inner peripheral size of the recess 68 of the insulating member 18b. Set to be equivalent.

  The heat insulating member 70 may be composed of one or three or more metal plates 24P and 26P, a plurality of single metal plates 24P may be laminated, or a single metal plate 26P. A plurality of sheets may be laminated.

  The heat insulating member 70 may be any member that retains pores and has electrical conductivity, and is made of a foam metal, honeycomb-shaped metal (honeycomb member), or porous carbon (for example, carbon paper) having electrical conductivity. You may comprise either. One heat insulating member 70 may be used, or a plurality of heat insulating members 70 may be stacked.

As shown in FIGS. 1 and 2, a holding member, for example, a resin pin member 72 is inserted into each stepped hole 69 of the insulating member 18b from the large diameter side. The resin-made pin member 72 is inserted into the hole 52 of the power generation cell 12 _end through the small diameter side of the stepped hole 69 while the head 72 a abuts against the wall surface of the stepped hole 69. . The distal end portion (the end portion opposite to the head portion 72a) of the resin pin member 72 protrudes outward from the hole portion 52, and the distal end portion is subjected to a heat caulking process so that a large diameter is obtained. A caulking portion 72b is provided.

  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 oxidant gas inlet communication hole 34a of the end plate 20a. A fuel gas such as a hydrogen-containing gas is supplied to the fuel gas inlet communication hole 38a of the end plate 20a, while a cooling medium such as pure water, ethylene glycol, or oil is supplied to the cooling medium inlet communication hole 36a of the end plate 20a. Supplied.

  As shown in FIG. 3, the oxidant gas is introduced into the oxidant gas flow path 42 of the second metal separator 26 from the oxidant gas inlet communication hole 34a. The oxidant gas moves in the direction of arrow B and is supplied to the cathode electrode 32 of the electrolyte membrane / electrode structure 22.

  On the other hand, the fuel gas is introduced into the fuel gas flow path 40 of the first metal separator 24 from the fuel gas inlet communication hole 38a. The fuel gas moves in the direction of arrow B along the fuel gas flow path 40 and is supplied to the anode electrode 30 of the electrolyte membrane / electrode structure 22.

  Accordingly, in each electrolyte membrane / electrode structure 22, the oxidant gas supplied to the cathode electrode 32 and the fuel gas supplied to the anode electrode 30 are consumed by an electrochemical reaction in the electrode catalyst layer to generate power. Done.

  Next, the oxidant gas consumed by being supplied to the cathode electrode 32 is discharged in the direction of arrow A along the oxidant gas outlet communication hole 34b. Similarly, the fuel gas consumed by being supplied to the anode electrode 30 is discharged in the direction of arrow A along the fuel gas outlet communication hole 38b.

  The cooling medium supplied to the cooling medium inlet communication hole 36 a is introduced into the cooling medium flow path 44 between the first metal separator 24 and the second metal separator 26 and then flows in the direction of arrow B. This cooling medium is discharged from the cooling medium outlet communication hole 36b after the electrolyte membrane / electrode structure 22 is cooled.

In this case, in the first embodiment, as shown in FIG. 2, a recess 68 is formed in the insulating member 18 b, and the heat insulating member 70 and the terminal plate 16 b are accommodated in the recess 68. Then, in a state where the power generation cell 12 _end is laminated on the insulating member 18b, each resin pin member 72 is integrally inserted into each stepped hole 69 of the insulating member 18b and each hole 52 of the power generation cell _12end. . Furthermore, a heat caulking process is performed on the tip of the resin pin member 72 to provide a caulking portion 72b. The resin pin member 72 and the insulating member 18b may be integrated, and screwing, clips, bands, or the like may be employed in addition to heat caulking.

For this reason, the insulating member 18b and the power generation cell _12end are integrated by the resin pin member 72, and the heat insulating member 70 and the terminal plate 16b can be accommodated and held. Therefore, when the fuel cell stack 10 is assembled, for example, the heat insulating member 70 cannot be satisfactorily held in the concave portion 68 of the insulating member 18b, and problems such as the heat insulating member 70 dropping do not occur.

  Therefore, the number of parts to be handled is reduced compared to the case of individually handling the parts such as the insulating member 18b, the terminal plate 16b, and the heat insulating member 70. Thereby, while handling of components is simplified, the effect that it becomes possible to improve assembly workability | operativity favorable is acquired.

  In the first embodiment, the heat insulating member 70 may be one end in the stacking direction of the fuel cell stack 10 or may be applied to both ends in the stacking direction. The same applies to the second and subsequent embodiments described below.

  FIG. 5 shows a fuel cell stack 80 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 80 includes a heat insulating member 82 instead of the heat insulating member 70 described above. The heat insulating member 82 includes at least a first heat insulating member 84 and a second heat insulating member 86, which are made of different materials, and the first heat insulating member 84 and the second heat insulating member 86 are alternately stacked.

  The 1st heat insulation member 84 is comprised with the metal plate shape | molded by the corrugated plate shape, for example, and can use at least any one of said metal plates 24P and 26P. The second heat insulating member 86 may be a member having a heat insulating mechanism, and for example, a carbon plate can be used. The second heat insulating member 86 is set to have a smaller outer dimension than the first heat insulating member 84.

In the recess 68 of the insulating member 18b, the heat insulating member 82 and the terminal plate 16b are accommodated, and in the state where the power generation cell 12 _end is laminated on the insulating member 18b, each resin pin member 72 is provided with each step of the insulating member 18b. The holes 69 and the power generation cells 12 _end are integrally inserted into the holes 52. And the crimping part 72b is provided in the front-end | tip part of the resin-made pin members 72 by the heat crimping process.

In the second embodiment configured as described above, the insulating member 18b and the power generation cell 12 _end are integrated by the resin pin member 72, and the heat insulating member 82 and the terminal plate 16b can be accommodated and held. The same effects as those of the first embodiment can be obtained.

  The first heat insulating member 84 and the second heat insulating member 86 can be variously combined as long as the materials are different from each other. Further, the number of stacked layers of the first heat insulating member 84 and the second heat insulating member 86 can be arbitrarily set.

  As shown in FIG. 6, the fuel cell stack 90 according to the third embodiment of the present invention includes a stacked body 94 in which a plurality of power generation cells 92 are stacked in the horizontal direction (arrow A direction). A terminal plate 96a, an insulating plate (insulating member) 98a, and an end plate 100a are sequentially arranged at one end in the stacking direction (arrow A direction) of the stack 94. At the other end in the stacking direction of the stacked body 94, a terminal plate 96b, an insulating member 98b, and an end plate 100b are sequentially disposed outward (see FIGS. 6 and 7).

  As shown in FIG. 8, the power generation cell 92 includes a first metal separator 104, a first electrolyte membrane / electrode structure (electrolyte / electrode structure) 106a, a second metal separator 108, and a second electrolyte membrane / electrode structure 106b. And a third metal separator 110 is provided. The first metal separator 104, the second metal separator 108, and the third metal separator 110 are, for example, a steel plate, a stainless steel plate, an aluminum plate, a plated steel plate, or a vertically long metal whose surface has been subjected to anticorrosion treatment. Although constituted by a plate, for example, a carbon separator may be used.

  The first electrolyte membrane / electrode structure 106a and the second electrolyte membrane / electrode structure 106b include, for example, a solid polymer electrolyte membrane 112 in which a perfluorosulfonic acid thin film is impregnated with water, and the solid polymer electrolyte membrane 112. An anode electrode 114 and a cathode electrode 116 sandwiching the electrode. The anode electrode 114 constitutes a step MEA having a smaller planar dimension than the cathode electrode 116, but conversely, the anode electrode 114 may have a larger planar dimension than the cathode electrode 116.

  An oxidant gas inlet communication hole 34a and a fuel gas inlet communication hole 38a are provided at the upper edge of the power generation cell 92 in the long side direction (arrow C direction). A fuel gas outlet communication hole 38b and an oxidant gas outlet communication hole 34b are provided at the lower edge of the power generation cell 92 in the long side direction (arrow C direction). A pair of cooling medium inlet communication holes 36a are provided above both edge portions of the power generation cell 92 in the short side direction (arrow B direction), and a pair of cooling medium inlet communication holes 36a are provided below both edge portions of the power generation cell 92 in the short side direction. The cooling medium outlet communication hole 36b is provided.

  A surface 104a of the first metal separator 104 facing the first electrolyte membrane / electrode structure 106a is formed with a first fuel gas flow path 40a that connects the fuel gas inlet communication hole 38a and the fuel gas outlet communication hole 38b. . A part of the cooling medium flow path 44 that connects the cooling medium inlet communication hole 36 a and the cooling medium outlet communication hole 36 b is formed on the surface 104 b of the first metal separator 104.

  A surface 108a of the second metal separator 108 facing the first electrolyte membrane / electrode structure 106a has a first oxidant gas flow path 42a that communicates the oxidant gas inlet communication hole 34a and the oxidant gas outlet communication hole 34b. It is formed. A second fuel gas flow path 40b that connects the fuel gas inlet communication hole 38a and the fuel gas outlet communication hole 38b is formed on the surface 108b of the second metal separator 108 facing the second electrolyte membrane / electrode structure 106b. .

  On the surface 110a of the third metal separator 110 facing the second electrolyte membrane / electrode structure 106b, there is a second oxidant gas flow path 42b that connects the oxidant gas inlet communication hole 34a and the oxidant gas outlet communication hole 34b. It is formed. A part of the cooling medium flow path 44 is formed on the surface 110 b of the third metal separator 110.

  A first seal member 118 is integrally formed on the surfaces 104 a and 104 b of the first metal separator 104 around the outer edge of the first metal separator 104. On the surfaces 108a and 108b of the second metal separator 108, the second seal member 120 is integrally formed around the outer peripheral edge of the second metal separator 108, and the surfaces 110a and 110b of the third metal separator 110 are integrally formed. The third seal member 122 is integrally molded around the outer peripheral edge of the third metal separator 110.

  The first metal separator 104 includes a plurality of outer supply holes 124a and inner supply holes 124b that connect the fuel gas inlet communication hole 38a and the first fuel gas flow path 40a, the fuel gas outlet communication hole 38b, and the first gas separator 40a. A plurality of outer discharge holes 126a and inner discharge holes 126b communicating with the fuel gas flow path 40a are provided.

  The second metal separator 108 includes a plurality of supply holes 128a communicating the fuel gas inlet communication hole 38a and the second fuel gas flow path 40b, the fuel gas outlet communication hole 38b, and the second fuel gas flow path 40b. And a plurality of discharge holes 128b communicating with each other.

As shown in FIG. 6, at least one power generation cell 92 _end disposed at at least one end of the laminated body 94, in the third embodiment, at the end close to the insulating member 98 b side, has four corners (one of the ends). Holes 52 are provided at diagonal positions, i.e., two locations.

Insulating member 98b, as well as a recess 68 in which the ends of the stack 94 side is open, wherein the four corners of the insulating member 98b, a stepped bore coaxially in the stacking direction with the holes 52 of the power generation cell 92 _{end The} A portion 69 is provided.

  The recess 68 houses the heat insulating member 130 and the terminal plate 96b. The heat insulating member 130 includes, for example, at least a first heat insulating member 132 and a second heat insulating member 134, which are different from each other, like the second embodiment, and the first heat insulating member 132, the second heat insulating member 134, and the like. Are stacked alternately. The first heat insulating member 132 is made of, for example, a metal plate, while the second heat insulating member 134 is made of, for example, a carbon plate. In addition, you may comprise the heat insulation member 130 similarly to the heat insulation member 70 of 1st Embodiment.

In the third embodiment, the heat insulating member 130 and the terminal plate 96b are accommodated in the recess 68 of the insulating member 98b, and the power generation cell 92 _end is stacked on the insulating member 98b. In this state, each resin pin member 72 is integrally inserted into each stepped hole 69 of the insulating member 98b and each hole 52 of the power generation cell _92end . And the crimping part 72b is provided in the front-end | tip part of the resin-made pin members 72 by the heat crimping process.

Thus, in the third embodiment, the insulating member 98b and the power generation cell 92 _end are integrated by the resin pin member 72, and the heat insulating member 130 and the terminal plate 96b can be accommodated and held. The same effects as those of the first and second embodiments can be obtained.

10,80,90 ... fuel cell stack _{12,12 end,} 92,92 end _... power generation cell 14,94 ... laminate 16a, 16b, 96a, 96b ... terminal plate 18a, 98a ... insulating plate 18b, 98b ... insulating member 20a 20b, 100a, 100b ... end plates 22, 106a, 106b ... electrolyte membrane / electrode structures 24, 26, 104, 108, 110 ... metal separators 24P, 26P ... metal plates 28, 112 ... solid polymer electrolyte membrane 30, 114 ... Anode electrode 32, 116 ... Cathode electrodes 40, 40a, 40b ... Fuel gas flow path 42, 42a, 42b ... Oxidant gas flow path 44 ... Cooling medium flow path 48, 50 ... Seal member 68 ... Recess 70, 82, 84, 86, 130, 132, 134 ... heat insulating member 72 ... resin-made pin member

Claims (3)

A power generation cell having an electrolyte / electrode structure in which electrodes are disposed on both sides of the electrolyte and a separator, and a terminal plate, an insulating member, and an end are provided on both sides in the stacking direction of the stacked body in which the plurality of power generation cells are stacked A fuel cell stack in which a plate is disposed,
At least one of the insulating members is provided with a recess in which an end portion on the laminate side is opened, and in the recess, a conductive heat insulating member is accommodated,
The one insulating member in which the conductive heat insulating member is accommodated has at least one power generation cell constituting an end of the laminated body integrally held by a holding member. . The fuel cell stack according to claim 1, wherein the holding member is a resin pin member,
The fuel pin stack, wherein the resin pin member is integrally inserted into the one insulating member and at least one of the power generation cells, and an end portion thereof is subjected to a heat caulking process.   3. The fuel cell stack according to claim 1, wherein the terminal plate is disposed in contact with a bottom surface in the recess.

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