JP2006059679A - Fuel cell stack - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To steadily prevent corrosion due to electric corrosion of a metal component with a simple and economical structure. <P>SOLUTION: A terminal plate 16a, an insulating plate 18a, and an end plate 20a are laminated on a laminate 14. Current collector parts 54 which face at least the lower part of an oxidant gas supply communicating hole 28a, cooling medium supply communicating hole 30a, fuel gas exhaust communicating hole 32b, fuel gas supply communicating hole 32a, cooling medium exhaust communicating hole 30b, and oxidizer gas exhaust communicating hole 28b, and perform current collection by directly contacting the generated water and the cooling medium are provided at the terminal plate 16a. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention has an electrolyte / electrode structure in which a pair of electrodes are disposed on both sides of an electrolyte, and the electrolyte / electrode structure and a separator are alternately stacked, and a terminal plate and an insulating plate are disposed at both ends in the stacking direction. And a fuel cell stack in which a fluid communication hole is formed to pass through at least one of a cooling medium and a reaction gas through the stacking direction.

  For example, in a polymer electrolyte fuel cell, an electrolyte membrane / electrode structure in which an anode side electrode and a cathode side electrode are provided on both sides of an electrolyte membrane (electrolyte) made of a polymer ion exchange membrane is sandwiched between separators. It has a power generation cell. In this type of fuel cell, a predetermined number of power generation cells are usually stacked, and a terminal plate, an insulating plate, and an end plate are disposed at both ends in the stacking direction to constitute a fuel cell stack.

  In this fuel cell, a fuel gas, for example, a gas mainly containing hydrogen (hereinafter also referred to as hydrogen-containing gas) is supplied to the anode side electrode, while an oxidant gas, for example, A gas or air mainly containing oxygen (hereinafter also referred to as oxygen-containing gas) is supplied. In the fuel gas supplied to the anode side electrode, hydrogen is ionized on the electrode catalyst and moves to the cathode side electrode side through the electrolyte membrane. Electrons generated during that time are taken out to an external circuit and used as direct current electric energy.

  In the fuel cell described above, 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 each separator. ing. Furthermore, between the separators, a cooling medium flow path for flowing the cooling medium is provided along the surface direction of the separator.

  Generally, a fuel cell constitutes a so-called internal manifold type fuel cell in which a fluid supply communication hole and a fluid discharge communication hole penetrating in the stacking direction are provided inside a separator. The fuel gas, the oxidant gas, and the cooling medium, which are fluids, are supplied to the fuel gas flow path, the oxidant gas flow path, and the cooling medium flow path from the fluid supply communication holes, and then the fluid discharge communication holes. Have been discharged.

  In this type of internal manifold fuel cell, the terminal plate and the end plate are provided with the fluid supply communication hole and the fluid discharge communication hole as necessary. At that time, in the case of a metal plate such as a terminal plate or the like, the generated water or the cooling water comes into contact with each other so that electric corrosion is likely to occur, which may cause corrosion.

  Therefore, for example, in the fuel cell stack disclosed in Patent Document 1, a terminal plate (terminal plate) 3 is interposed between the separator 1 and the insulating plate 2 as shown in FIG. The separator 1, the terminal plate 3, and the insulating plate 2 have a communication hole 4 penetrating in the stacking direction, and the terminal plate 3 has an inner periphery around the communication hole 4 and a locking portion 5 extending over the entire circumference. Is formed.

  An insulating grommet 6 is attached to the terminal board 3. The insulating grommet 6 is provided with an engaging portion 7 fitted to the engaging portion 5 and has a seal lip 8 corresponding to a contact portion between the adjacent separator 1 and insulating plate 2.

JP 2002-124292 A (FIG. 7)

  By the way, in said patent document 1, while using the grommet 6 with a complicated shape as an insulation structure, it is necessary to form the latching | locking part 5 in the inner periphery of the terminal board 3 circularly. For this reason, it is difficult to economically configure the insulating structure itself, and there is a problem that the manufacturing cost is considerably increased particularly when a large number of insulating structures are provided in the fuel cell stack.

  The present invention solves this type of problem, and an object of the present invention is to provide a fuel cell stack that can reliably prevent corrosion due to electric corrosion of metal parts with a simple and economical configuration.

  The present invention has an electrolyte / electrode structure in which a pair of electrodes are disposed on both sides of an electrolyte, and the electrolyte / electrode structure and a separator are alternately stacked, and a terminal plate and an insulating plate are disposed at both ends in the stacking direction. Is a fuel cell stack in which an end plate is disposed and fluid communication holes are formed so as to pass through at least one of a cooling medium and a reactive gas through the stacking direction.

  The fuel cell stack includes a current collecting member that is disposed in at least one of the fluid communication holes and collects electricity by contacting the fluid flowing through the fluid communication hole.

  The current collecting member is preferably disposed on at least the high potential side of the laminate in which the electrolyte / electrode structure and the separator are alternately laminated. This is because the high-potential side corrosion current can be reduced satisfactorily.

  Furthermore, the current collecting member is preferably composed of any one of a conductive plate, a conductive net, a conductive fin member, or a conductive bar. Furthermore, it is preferable that a fluid communication hole is formed in the terminal plate, and the current collecting member is integrally or individually provided in the terminal plate corresponding to the fluid communication hole.

  The insulating plate is located inside the fluid communication hole in which the current collecting member is disposed, and has a recess for accommodating the terminal plate. The current collecting member is connected to the terminal plate via a connection terminal. Are preferably electrically connected. Furthermore, the current collecting member preferably has a rust prevention structure.

  According to the present invention, since the current collecting member is in direct contact with the fluid flowing through the fluid communication hole, a current can be forced to flow through the current collecting member via the generated water or the cooling medium. As a result, the corrosion current can be effectively reduced, and it is possible to reliably suppress the occurrence of corrosion due to electrolytic corrosion on metal parts such as the terminal plate with a simple and economical configuration.

  FIG. 1 is a partially exploded perspective view of a fuel cell stack 10 according to the first embodiment of the present invention.

  The fuel cell stack 10 is mounted on a vehicle such as an automobile, for example. The fuel cell stack 10 includes a stacked body 14 in which a plurality of power generation cells 12 are stacked in the direction of arrow A, and terminal plates 16a and 16b and insulating plates 18a and 18b are interposed at both ends of the stacked body 14 in the stacking direction. End plates 20a and 20b are arranged. The end plates 20a and 20b are fastened in the stacking direction by fastening bolts (not shown).

  As shown in FIG. 1 and FIG. 2, each power generation cell 12 includes an electrolyte membrane / electrode structure (electrolyte / electrode structure) 22, and a thin plate-shaped first and second sandwiching the electrolyte membrane / electrode structure 22. Second metal separators 24 and 26 are provided. Instead of the first and second metal separators 24 and 26, for example, a carbon separator may be used.

  An oxidant gas supply communication hole 28a for supplying an oxidant gas, for example, an oxygen-containing gas (such as air), is connected to one end edge of the power generation cell 12 in the arrow B direction, and is cooled. A cooling medium supply communication hole 30a for supplying a medium such as pure water or ethylene glycol, and a fuel gas discharge communication hole 32b for discharging a fuel gas such as a hydrogen-containing gas are provided.

  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, the fuel gas supply communication hole 32a for supplying fuel gas, and the cooling medium discharge communication hole for discharging the cooling medium. 30b and an oxidant gas discharge communication hole 28b for discharging the oxidant gas are provided.

  The electrolyte membrane / electrode structure 22 includes, for example, a solid polymer electrolyte membrane 34 in which a perfluorosulfonic acid thin film is impregnated with water, and an anode side electrode 36 and a cathode side electrode 38 that sandwich the solid polymer electrolyte membrane 34. With.

  The anode side electrode 36 and the cathode side electrode 38 are uniformly coated on the surface of the gas diffusion layer with a gas diffusion layer (not shown) made of carbon paper or the like and porous carbon particles carrying a platinum alloy on the surface. And an electrode catalyst layer (not shown) formed. The electrode catalyst layers are formed on both surfaces of the solid polymer electrolyte membrane 34.

  The first metal separator 24 is provided with an oxidant gas flow path 40 that communicates the oxidant gas supply communication hole 28 a and the oxidant gas discharge communication hole 28 b on the surface facing the electrolyte membrane / electrode structure 22. The first metal separator 24 is provided with a cooling medium flow path 42 that communicates the cooling medium supply communication hole 30a and the cooling medium discharge communication hole 30b on the opposite surface.

  The second metal separator 26 is provided with a fuel gas passage 44 on the surface facing the electrolyte membrane / electrode structure 22, and the fuel gas passage 44 is formed in the fuel gas supply communication hole 32 a and the fuel gas discharge communication hole 32 b. Communicate. The second metal separator 26 overlaps with the first metal separator 24 on the opposite surface and integrally forms the cooling medium flow path 42.

  The oxidant gas flow path 40, the cooling medium flow path 42, and the fuel gas flow path 44 are constituted by, for example, a plurality of grooves extending in the arrow B direction. A seal member (not shown) is integrally formed on the peripheral portions of the surfaces of the first and second metal separators 24 and 26.

  As shown in FIGS. 1 and 3, on one end side of the end plate 20a in the direction of arrow B, a manifold pipe 46a that communicates with the oxidant gas supply communication hole 28a, the cooling medium supply communication hole 30a, and the fuel gas discharge communication hole 32b. , 48a and 50b are integrally or individually disposed. On the other end side of the end plate 20a in the direction of arrow B, manifold pipes 50a, 48b and 46b communicating with the fuel gas supply communication hole 32a, the cooling medium discharge communication hole 30b and the oxidant gas discharge communication hole 28b are integrated or individually provided. It is arranged.

  As shown in FIG. 4, the end plate 20a includes an oxidant gas supply communication hole 28a, a cooling medium supply communication hole 30a, a fuel gas discharge communication hole 32b, a fuel gas supply communication hole 32a, a cooling medium discharge communication hole 30b, and an oxidation. An insulating grommet 52 is disposed on each rectangular inner peripheral surface of the agent gas discharge communication hole 28b.

  As shown in FIGS. 3 and 4, the terminal plate 16a is formed of a metal plate, for example, a copper plate. The terminal plate 16a includes an oxidant gas supply communication hole 28a, a cooling medium supply communication hole 30a, a fuel gas discharge communication hole 32b, a fuel gas supply communication hole 32a, a cooling medium discharge communication hole 30b, and an oxidant gas discharge communication hole 28b. A current collecting part (current collecting member) 54 is provided facing at least the lower part.

  The current collector 54 is provided integrally with the terminal plate 16a, but may be configured separately from the terminal plate 16a. The current collector 54 is formed with a plurality of holes 56 and configured to relieve fluid resistance (pressure loss). On the surface of the current collector 54, for example, a gold plating processing unit 58 is provided as a rust prevention structure. ing.

  The terminal plate 16b is configured similarly to the terminal plate 16a described above, and a detailed description thereof is omitted. The terminal plate 16a is disposed on the high potential side (cathode side) of the laminate 14, and a current collector 54 is provided to reduce the corrosion current on the high potential side. On the other hand, the terminal plate 16b is disposed on the low potential side (anode side) of the laminate 14, and the current collector 54 is provided as necessary to avoid the influence of the low potential.

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

  First, as shown in FIG. 1, the oxidant gas is supplied from the manifold pipe 46 a to the oxidant gas supply communication hole 28 a of the fuel cell stack 10. On the other hand, the fuel gas is supplied from the manifold pipe 50 a to the fuel gas supply communication hole 32 a of the fuel cell stack 10. Further, the cooling medium is supplied from the manifold pipe 48 a to the cooling medium supply communication hole 30 a of the fuel cell stack 10.

  In the fuel cell stack 10, an oxidant gas is introduced into the oxidant gas flow path 40 of the first metal separator 24 from the oxidant gas supply communication hole 28 a, and along the cathode side electrode 38 of the electrolyte membrane / electrode structure 22. Move. On the other hand, the fuel gas is introduced into the fuel gas flow path 44 of the second metal separator 26 from the fuel gas supply communication hole 32 a and moves along the anode side electrode 36 of the electrolyte membrane / electrode structure 22.

  Therefore, in each electrolyte membrane / electrode structure 22, the oxidant gas supplied to the cathode side electrode 38 and the fuel gas supplied to the anode side electrode 36 are consumed by an electrochemical reaction in the electrode catalyst layer, Power generation is performed.

  Next, the oxidant gas supplied and consumed to the cathode side electrode 38 flows along the oxidant gas discharge communication hole 28b, and is then discharged to the manifold piping 46b connected to the end plate 20a. Similarly, the fuel gas consumed by being supplied to the anode side electrode 36 is discharged to the fuel gas discharge communication hole 32b, flows, and discharged to the manifold pipe 50b connected to the end plate 20a.

  In addition, a cooling medium such as pure water or ethylene glycol is introduced into the cooling medium flow path 42 between the first and second metal separators 24 and 26 and then flows along the arrow B direction. The cooling medium cools the electrolyte membrane / electrode structure 22, then moves through the cooling medium discharge communication hole 30b, is discharged to the manifold piping 48b connected to the end plate 20a, and is circulated for use.

  In this case, in the first embodiment, the oxidant gas supply communication hole 28a, the cooling medium supply communication hole 30a, the fuel gas discharge communication hole 32b, the fuel gas supply communication hole 32a, the cooling medium discharge are provided in the terminal plates 16a and 16b. A current collector 54 is provided integrally (or separately) so as to face at least the lower part of the communication hole 30b and the oxidizing gas discharge communication hole 28b, and a plurality of holes 56 are formed in the current collector 54. ing. Further, a rust-preventing gold plating processing unit 58 is provided on the surface of the current collecting unit 54.

  For this reason, for example, in the oxidant gas discharge communication hole 28b where generated water is likely to be generated due to the reaction, the generated water directly contacts the current collectors 54 of the terminal plates 16a and 16b, and the terminal is connected via the generated water. Current can be forced to flow through the plates 16a and 16b. Therefore, in particular, it is possible to effectively prevent the corrosion current from flowing through the terminal plate 16a and the electrolytic corrosion from occurring at the terminal plate 16a.

  Specifically, the following description will be made with reference to the equivalent circuit shown in FIG. 6 in the cooling medium supply communication hole 30a shown in FIG.

The cooling medium flow path 42 formed between the power generation cells 12 communicates with the cooling medium supply communication hole 30a through an introduction part (bridge part) 42a. An insulating coating is provided on the inner surface of the cooling medium supply communication hole 30a and the inner surface of the introduction portion 42a. Therefore, as shown in FIG. 6, the liquid resistance R _A of the introduction portion 42 a exists between the power generation cells 12, while the liquid resistance R _B of the cooling medium supply communication hole 30 a exists for each power generation cell 12. is doing.

For example, the power generation cell 12 generates a voltage of 1 V, and 220 power generation cells 12 are stacked in series. The high potential side and a terminal plate 16a, together with the reaction resistance R _C of the collector unit 54 is generated, the low potential side of the terminal plate 16b, Similarly, reaction resistance R _C is generated by the current collector 54 is doing.

  Here, a configuration (Example 1) in which the current collector 54 is provided only on the terminal plate 16a, a configuration (in Example 2) in which the current collector 54 is provided on the terminal plates 16a and 16b, the terminal plate 16a, A configuration in which the current collector 54 is not provided in 16b (conventional example) was prepared.

  Therefore, the relationship between the position of the power generation cell 12 and the corrosion current flowing through each cooling medium flow path 42 was detected using the first embodiment, the second embodiment, and the conventional example. The result is shown in FIG.

  As can be seen from FIG. 7, in the conventional example, a considerably high corrosion current flowed in the coolant flow path 42 on the high potential side. On the other hand, in the first embodiment and the second embodiment, the current collector 54 is provided on the high potential side, and the corrosion current is forced to flow through the current collector 54, so that the coolant flow path 42. Corrosion current flowing through it has been greatly reduced.

  As a result, in the first embodiment, the metal parts (for example, the first and second metal separators 24 and 26) are provided with a simple and economical configuration in which the current collector 54 is provided on the terminal plate 16a on the high potential side. Thus, it is possible to reliably prevent the occurrence of corrosion due to electric corrosion.

  Furthermore, each current collector 54 is provided so as to cover substantially the lower half of the opening area of each communication hole, and a plurality of holes 56 are formed. For this reason, it is possible to satisfactorily reduce the pressure loss of the oxidant gas, the fuel gas, and the cooling medium flowing through the respective communication holes.

  Furthermore, in the second embodiment, the current collector 54 is provided on the terminal plate 16b on the low potential side. Thereby, as shown in FIG. 7, since the anticorrosion current on the low potential side is greatly reduced, the current value can be approximated to 0 from the low potential side to the high potential side. That is, it becomes possible to satisfactorily reduce the corrosion current and the anticorrosion current.

  FIG. 8 is a partially exploded perspective view of a fuel cell stack 70 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 to fifth embodiments described below, detailed description thereof is omitted.

  The fuel cell stack 70 is provided with terminal plates 72 at both ends of the power generation cells 12 in the stacking direction. The terminal plate 72 includes an oxidant gas supply communication hole 28a, a cooling medium supply communication hole 30a, a fuel gas discharge communication hole 32b, a fuel gas supply communication hole 32a, a cooling medium discharge communication hole 30b, and an oxidant gas discharge communication hole 28b. Fin members (current collecting members) 74 are provided individually or integrally so as to face at least the lower part of the plate.

  The fin member 74 includes a plurality of plate members 76 extending in the arrow B direction and a plurality of plate members 78 extending in the arrow C direction. The fin member 74 is formed of, for example, a copper material subjected to gold plating, platinum, carbon, or vanadium as a rust prevention structure.

  The fin member 74 is sandwiched between members disposed on both sides in the stacking direction while being inserted into the terminal plate 72.

  FIG. 9 is a partially exploded perspective view of a fuel cell stack 90 according to the third embodiment of the present invention.

  On one surface of the terminal plate 92 constituting the fuel cell stack 90, an oxidant gas supply communication hole 28a, a cooling medium supply communication hole 30a, a fuel gas discharge communication hole 32b, a fuel gas supply communication hole 32a, and a cooling medium discharge communication are provided. A mesh member (current collecting member) 94 is disposed corresponding to at least the lower part of the hole 30b and the oxidizing gas discharge communication hole 28b.

  The mesh member 94 is made of the same material as that of the fin member 74, and is clamped and fixed by, for example, the adjacent member disposed on one surface side of the terminal plate 92 and the terminal plate 92.

  The mesh member 94 may be provided over the entire opening area of each communication hole, or may be provided only on the lower side of the communication hole.

  FIG. 10 is a partially exploded perspective view of a fuel cell stack 110 according to the fourth embodiment of the present invention.

  On one surface of the terminal plate 112 constituting the fuel cell stack 110, an oxidant gas supply communication hole 28a, a cooling medium supply communication hole 30a, a fuel gas discharge communication hole 32b, a fuel gas supply communication hole 32a, and a cooling medium discharge communication are provided. A plurality of grooves 114 are formed extending in the direction of arrow B for each of the holes 30b and the oxidizing gas discharge communication holes 28b.

  Each groove 114 accommodates a bar (current collecting member) 116, and the circumferential surface of the bar 116 is disposed on substantially the same plane as one surface of the terminal plate 112. The bar 116 is made of the same material as that of the fin member 74, and each bar 116 is held by the terminal plate 112 via an insulating plate (not shown), for example, while being accommodated in the groove 114.

  In said 2nd-4th embodiment, the fin member 74, the mesh member 94, and the bar | burr 116 are used as a current collection member, A current collection process can be performed in direct contact with generated water or a cooling medium. . As a result, the same effects as those of the first embodiment can be obtained, for example, it is possible to prevent the corrosion due to the electric corrosion of the terminal plates 72, 92 and 112.

  FIG. 11 is a partially exploded perspective view of a fuel cell stack 130 according to the fifth embodiment of the present invention.

  The fuel cell stack 130 includes a terminal plate 132, an insulating plate 134, and an end plate 136 that are disposed at both ends of the stacked body 14 in the direction of arrow A. A terminal portion 138 is provided at the approximate center of the terminal plate 132 so as to protrude in the direction of arrow A.

  The insulating plate 134 is configured in a frame shape, and is provided with a recess 140 for accommodating the terminal plate 132, and a hole 142 is formed in the approximate center of the recess 140. The terminal plate 132 is accommodated in the recess 140, and the terminal portion 138 is integrally inserted into the hole portion 142 and the hole portion 144 of the end plate 136.

  The insulating plate 134 includes an oxidant gas supply communication hole 28a, a cooling medium supply communication hole 30a, a fuel gas discharge communication hole 32b, a fuel gas supply communication hole 32a, a cooling medium discharge communication hole 30b, and an oxidant gas discharge communication hole 28b. A plate-like current collecting member 146 is disposed facing at least the lower part.

  The current collecting member 146 is formed of, for example, a copper material subjected to gold plating, platinum, carbon, or vanadium, and a plurality of holes 148 are formed. The current collecting member 146 is configured substantially in the same manner as the current collecting unit 54. As shown in FIGS. 11 and 12, each current collecting member 146 and the terminal plate 132 are electrically connected via the connection terminal 150.

  In the fifth embodiment configured as described above, the generated water and the cooling medium are in direct contact with the current collecting member 146, and the current collecting member 146 and the terminal plate 132 are electrically connected via the connection terminals 150. It is connected. For this reason, a current can be forced to flow from the generated water or the cooling medium to the terminal plate 132.

  Therefore, it is possible to effectively suppress the corrosion current from flowing through the metal parts constituting the fuel cell stack 130, and to reliably prevent corrosion due to electrolytic corrosion, and the like, as in the first to fourth embodiments. An effect is obtained. Moreover, since the metal terminal plate 132 is separate from the manifold, the size is set small, and there is an advantage that the weight can be easily reduced.

1 is a partially exploded perspective view of a fuel cell stack according to a first embodiment of the present invention. It is a partial cross section side view of the said fuel cell stack. It is a perspective explanatory view in the state where the terminal plate, insulating plate, and end plate which constitute the fuel cell stack were separated. FIG. 3 is a partial cross-sectional explanatory view of the fuel cell stack. It is sectional explanatory drawing along a cooling-medium supply communication hole. FIG. 6 is an equivalent circuit diagram of FIG. 5. It is a related figure of the number of laminations of a power generation cell, and corrosion current. FIG. 4 is a partially exploded perspective view of a fuel cell stack according to a second embodiment of the present invention. FIG. 6 is a partially exploded perspective view of a fuel cell stack according to a third embodiment of the present invention. FIG. 6 is a partially exploded perspective view of a fuel cell stack according to a fourth embodiment of the present invention. FIG. 9 is a partially exploded perspective view of a fuel cell stack according to a fifth embodiment of the present invention. It is front explanatory drawing of the terminal plate and insulation plate which comprise the said fuel cell stack. 2 is a partial cross-sectional explanatory view of a fuel cell stack of Patent Document 1. FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10, 70, 90, 110, 130 ... Fuel cell stack 12 ... Power generation cell 14 ... Laminated body 16a, 16b, 72, 92, 112, 132 ... Terminal plate 18a, 18b, 134 ... Insulation plate 20a, 20b, 136 ... End Plate 22 ... Electrolyte membrane / electrode structure 24, 26 ... Metal separator 28a ... Oxidant gas supply communication hole 28b ... Oxidant gas discharge communication hole 30a ... Cooling medium supply communication hole 30b ... Cooling medium discharge communication hole 32a ... Fuel gas supply Communication hole 32b ... Fuel gas discharge communication hole 34 ... Solid polymer electrolyte membrane 36 ... Anode side electrode 38 ... Cathode side electrode 40 ... Oxidant gas flow path 42 ... Cooling medium flow path 42a ... Introduction part 44 ... Fuel gas flow path 52 ... Insulating grommet 54 ... Current collecting part 56 ... Hole part 58 ... Gold plating part 74 ... Fin member 94 ... Mesh member 114 ... Part 116 ... rod 146 ... the current collecting member

Claims (6)

It has an electrolyte / electrode structure in which a pair of electrodes are arranged on both sides of the electrolyte, and the electrolyte / electrode structure and separator are alternately stacked, and a terminal plate and an insulating plate are interposed at both ends in the stacking direction. A fuel cell stack in which a fluid communication hole is formed, in which an end plate is disposed and through which at least a fluid of a cooling medium or a reaction gas flows in the stacking direction,
A fuel cell stack, comprising: a current collecting member that is disposed in at least one of the fluid communication holes and collects electricity in contact with the fluid flowing through the fluid communication hole.   2. The fuel cell stack according to claim 1, wherein the current collecting member is disposed on at least a high potential side of a laminate in which the electrolyte / electrode structure and the separator are alternately laminated. stack.   3. The fuel cell stack according to claim 1, wherein the current collecting member is formed of any one of a conductive plate member, a conductive net member, a conductive fin member, and a conductive bar member. stack. The fuel cell stack according to any one of claims 1 to 3, wherein the fluid communication hole is formed in the terminal plate,
The fuel cell stack, wherein the current collecting member is integrally or individually provided on the terminal plate corresponding to the fluid communication hole. 4. The fuel cell stack according to claim 1, wherein the insulating plate is positioned inward of the fluid communication hole in which the current collecting member is disposed and accommodates the terminal plate. 5. A recess is formed,
The fuel cell stack, wherein the current collecting member is electrically connected to the terminal plate via a connection terminal. 6. The fuel cell stack according to claim 1, wherein the current collecting member has a rust prevention structure. 7.

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