JP6605107B2 - Fuel cell stack - Google Patents

Description

  The present invention relates to a fuel cell stack having a fuel cell that generates electricity by an electrochemical reaction between a fuel gas and an oxidant gas, wherein the plurality of fuel cells are stacked and end plates are disposed at both ends in the stacking direction. .

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

  In the fuel cell, 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 adjacent to each other, a cooling medium flow path for flowing the cooling medium is provided along the surface direction of the separator.

  The fuel cell further includes 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 manifold type fuel cell is adopted. The fuel gas communication hole has a fuel gas supply communication hole and a fuel gas discharge communication hole, the oxidant gas communication hole has an oxidant gas supply communication hole and an oxidant gas discharge communication hole, and the cooling medium communication hole has And a cooling medium supply communication hole and a cooling medium discharge communication hole.

  In the fuel cell, at least one end plate is provided with a fluid manifold that supplies or discharges fluid (fuel gas, oxidant gas, or cooling medium) connected to each communication hole. Furthermore, a fluid supply pipe and a fluid discharge pipe are connected to the fluid manifold.

  By the way, the reaction gas which is at least one of the oxidant gas and the fuel gas is supplied to the fuel cell in a humidified state in advance. Further, in the fuel cell, generated water is generated on the cathode side by a power generation reaction, and the generated water is easily back-diffused on the anode side. For this reason, water vapor may stay in the fluid manifold, and the water vapor may condense and liquid water (condensed water) may exist. Therefore, there is a risk that the fuel cell is electrically connected (liquid junction) to an external device or the like due to the connection of liquid water.

  Therefore, in order to prevent water droplets from being generated in the reaction gas, for example, a solid polymer electrolyte fuel cell disclosed in Patent Document 1 is known. The fuel cell includes a pressurizing plate that pressurizes the stack of fuel cells in the stacking direction, and the pressurizing plate is for heating the oxidant gas and / or the fuel gas at a site where the pipe connection body is installed. A heating unit is provided.

  The heating unit has a cylindrical outer shape having substantially the same thickness as the main body of the pressure plate, and a cylindrical cavity is provided inside. The heating part is provided with a gas flow part in which a hollow part is hermetically sealed from the inside and a through hole is formed in the center part for flowing an oxidant gas. And since the heating medium heated by cooling the laminated body is supplied to the hollow portion, the oxidant gas flowing through the gas flow portion is heated, and the generation of liquid water is suppressed. I can do it.

Japanese Patent Laid-Open No. 10-12262

  However, in the fuel cell described above, a heating unit and a gas flow unit are provided in order to heat a reaction gas such as an oxidant gas. For this reason, there is a problem that the configuration becomes complicated and it is not economical.

  Moreover, the fuel cell is provided with a cooling medium manifold for circulating the cooling medium in addition to the reaction gas. At that time, the inside of the fuel cell and the cooling medium manifold are easily electrically connected through the cooling medium, and the fuel cell may have a liquid junction with an external device through the cooling medium. However, the above fuel cell has a problem that a liquid junction between the fuel cell and an external device cannot be suppressed.

  The present invention solves this type of problem, and provides a fuel cell stack capable of ensuring good electrical insulation between a fluid manifold and an end plate with a simple and economical configuration. For the purpose.

  The fuel cell stack according to the present invention includes a fuel cell that generates power by an electrochemical reaction between a fuel gas and an oxidant gas, and includes a stacked body in which a plurality of fuel cells are stacked. A plurality of fluid communication holes through which the cooling medium flows in the fuel cell are formed in the stacked body along the stacking direction.

End plates are disposed at both ends in the stacking direction of the laminate, and at least one end plate is formed with openings of the plurality of fluid communication holes through which the cooling medium flows, and the plurality of fluid communication. fluid manifold member having an internal space and the coolant is passing flow communication is provided in the hole. An insulating plate is disposed between the one end plate and the mounting surface of the fluid manifold member.

  In this fuel cell stack, it is preferable that the insulating plate has a contact surface that contacts one end plate, and a gap is formed on the contact surface except for a portion that circulates around the fluid communication hole.

  Further, in this fuel cell stack, the gap is preferably constituted by a recess formed on at least one of the end plate side or the fluid manifold member side.

  According to the present invention, the insulating plate is disposed between the fluid manifold member and the end plate. For this reason, electrical insulation between the fluid manifold member and the end plate can be satisfactorily secured with a simple and economical configuration. Therefore, it is possible to satisfactorily suppress electrical connection between the fuel cell and the external device using liquid water.

It is a perspective explanatory view by the side of a cooling medium manifold member of a fuel cell stack concerning an embodiment of the present invention. It is a partially exploded perspective view of the fuel cell stack. It is a principal part disassembled perspective explanatory drawing of the fuel cell which comprises the said fuel cell stack. FIG. 4 is a cross-sectional view of the fuel cell stack taken along line IV-IV in FIG. 1. It is a disassembled perspective explanatory drawing from the one side of the cooling-medium supply manifold member and insulating plate which comprise the said fuel cell stack. It is a disassembled perspective explanatory view from the other side of the cooling medium supply manifold member and the insulating plate.

  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 fuel cells 12 are stacked in a horizontal direction (arrow B direction) with an electrode surface in an upright posture. Note that the fuel cell stack 10 may be configured by stacking a plurality of fuel cells 12 in the direction of gravity.

  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 fuel cell 12 (one end of the stacked body 12as). Arranged. At the other end in the stacking direction of the fuel cell 12 (the other end of the stacked body 12as), a second terminal plate 14b, a second insulating plate 16b, and a second end plate 18b are sequentially disposed outward. .

  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. A second power output terminal 20b connected to the second terminal plate 14b extends outward from a substantially central portion of the horizontally long (rectangular) second end plate 18b.

  Between each side of the first end plate 18a and the second end plate 18b, a connecting bar 22 having a certain length corresponding to the substantially central position of each side is arranged. Both ends of the connecting bar 22 are fixed by screws 24, and a tightening load in the stacking direction (arrow B direction) is applied to the stacked body 12as.

  The fuel cell stack 10 includes a casing 26 as necessary. The casing 26 includes a first end plate 18a and a second end plate 18b at two sides (surfaces) at both ends in the vehicle width direction (arrow B direction). Two sides (surfaces) at both ends of the casing 26 in the vehicle length direction (arrow A direction) are constituted by a horizontally long plate-shaped front side panel 28a and rear side panel 28b. Two sides (surfaces) at both ends of the casing 26 in the vehicle height direction (arrow C direction) 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.

  The first end plate 18a and the second end plate 18b are provided with screw holes 32 on each side. Hole portions 34 are formed in the front side panel 28a, the rear 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 fuel cell 12 includes an electrolyte membrane / electrode structure 40, a first metal separator (cathode side separator) 42 and a second metal separator (anode side) that sandwich the electrolyte membrane / electrode structure 40. Separator) 44.

  The first metal separator 42 and the second metal 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 that has been subjected to a surface treatment for anticorrosion. The first metal separator 42 and the second metal 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. Instead of the first metal separator 42 and the second metal separator 44, for example, a carbon separator may be used.

  The first metal separator 42 and the second metal separator 44 have a horizontally long shape, and have long sides extending in the horizontal direction (arrow A direction) and short sides extending in the direction of gravity (arrow C direction). Composed. In addition, you may comprise so that a short side may extend in a horizontal direction and a long side may extend in a gravitational direction.

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

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

  Two sets of two ends of the fuel cell 12 in the short side direction (arrow C direction) (one side in the horizontal direction), that is, on the side of the oxidant gas supply communication hole 46a and the fuel gas supply communication hole 48a A cooling medium supply communication hole 50a is provided. The two sets of cooling medium supply communication holes 50a communicate with each other in the direction of arrow B in order to supply the cooling medium, and are provided vertically on opposite sides.

  The coolant supply communication hole 50a on the upper side of the fuel cell 12 is divided into two in the horizontal direction, and the coolant is circulated independently of each other. The coolant supply communication hole 50a on the lower side of the fuel cell 12 is divided into two in the horizontal direction, and allows the coolant to flow independently.

  Two sets of cooling medium discharge communication are provided on the other side (the other end in the horizontal direction) of both ends in the short side direction of the fuel cell 12, that is, on the fuel gas discharge communication hole 48b and the oxidant gas discharge communication hole 46b side. A hole 50b is provided. The two sets of 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 vertically on opposite sides. Each cooling medium discharge communication hole 50b is divided into two in the horizontal direction, and allows the cooling medium to flow independently.

  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 46 a and the oxidant gas discharge communication hole 46 b is formed on the surface 42 a of the first metal 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 second metal 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 second metal separator 44 and the surface 42b of the adjacent first metal separator 42, a cooling medium flow path communicating with the cooling medium supply communication holes 50a, 50a and the cooling medium discharge communication holes 50b, 50b. 62 is formed. 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 first metal separator 42 around the outer peripheral edge of the first metal separator 42. A second seal member 66 is integrally formed on the surfaces 44 a and 44 b of the second metal separator 44 around the outer peripheral edge of the second metal 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 member 68a, an oxidant gas discharge manifold member 68b, a fuel gas supply manifold member 70a, and a fuel gas discharge manifold member 70b are attached to the first end plate 18a. The oxidant gas supply manifold member 68a, the oxidant gas discharge manifold member 68b, the fuel gas supply manifold member 70a, and the fuel gas discharge manifold member 70b are made of an electrically insulating resin.

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

  As shown in FIG. 1, a resin coolant supply manifold member (fluid manifold member) 72a communicating with a pair of coolant supply communication holes 50a up and down is injected into the second end plate (one end plate) 18b. Provided by molding. The second end plate 18b is provided with a resin cooling medium discharge manifold member (fluid manifold member) 72b communicating with the pair of cooling medium discharge communication holes 50b by injection molding. The cooling medium supply manifold member 72a and the cooling medium discharge manifold member 72b preferably have electrical insulation.

  As shown in FIGS. 4 to 6, the cooling medium supply manifold member 72a is fixed to the second end plate 18b with an insulating plate 74a made of an electrically insulating resin or the like interposed therebetween. The insulating plate 74a has a substantially flat plate shape, and is integrally formed with the cooling medium inlet 76a that communicates integrally with the upper two divided cooling medium supply communication holes 50a and the lower divided two divided cooling medium supply communication holes 50a. And a cooling medium inlet 76a communicating therewith.

  As shown in FIGS. 4 and 5, the insulating plate 74a has a contact surface 74as that contacts the second end plate 18b. The contact surface 74as includes a first recess 78a except for portions 77a and 77a that circulate around the pair of upper and lower cooling medium supply communication holes 50a and 50a and portions 77b and 77b that connect both ends of the circulated portions 77a and 77a. Is formed (see FIG. 5). The first recess 78a is formed to have a substantially rectangular shape at the center of the contact surface 74as.

  As shown in FIGS. 4 and 6, the insulating plate 74a has a second recess 80a communicating with the internal space 72ac of the cooling medium supply manifold member 72a on the surface in contact with the cooling medium supply manifold member 72a. The second recess 80a has a substantially rectangular shape, and is set to have the same opening size as that of the first recess 78a, for example.

  A plurality of holes 82a are formed in the outer peripheral edge of the insulating plate 74a. As shown in FIG. 4, the screw 84a inserted into each hole 82a is screwed into a screw hole 85a provided in the second end plate 18b, whereby the insulating plate 74a is engaged with the second end plate 18b. Fixed. In the insulating plate 74a, a plurality of screw holes 86a are formed on the surface 74af on the cooling medium supply manifold member 72a side so as to go around the second recess 80a and the cooling medium inlet 76a (see FIG. 6).

  The cooling medium supply manifold member 72a has a flange portion 88a that goes around the internal space 72ac. A plurality of hole portions 90a are formed in the flange portion 88a corresponding to each screw hole 86a. The screw 92a inserted into each hole 90a is screwed into the screw hole 86a, whereby the cooling medium supply manifold member 72a is fixed to the insulating plate 74a. Note that a screw hole may be provided in the second end plate 18b, and the cooling medium supply manifold member 72a and the insulating plate 74a may be fastened together with the screw 92a.

  The cooling medium supply manifold member 72a has an inlet pipe portion 94a that is a cooling medium supply port at an intermediate position in the direction of arrow C (the central portion in the flow width direction of the cooling medium flow channel 62) toward the horizontal direction or horizontally. Inclined from the direction.

  As shown in FIG. 4, a first gap 96a is formed between the surface of the second end plate 18b and the contact surface 74as of the insulating plate 74a via a first recess 78a. A second gap 98a is formed between the surface 74af of the insulating plate 74a and the mounting surface 72as of the cooling medium supply manifold member 72a via a second recess 80a. Note that at least one of the first gap 96a and the second gap 98a may be provided. Further, between the cooling medium supply manifold member 72a and the insulating plate 74a, and between the insulating plate 74a and the second end plate 18b, a seal member (not shown) circulates around the outer periphery of the cooling medium circulation region. Provided.

  As shown in FIG. 1, the cooling medium discharge manifold member 72b is fixed to the second end plate 18b via an insulating plate 74b made of an electrically insulating resin or the like. Note that the same reference numerals as those in the cooling medium supply manifold member 72a are denoted by b instead of a, and detailed description thereof is omitted. The cooling medium discharge manifold member 72b is provided with an outlet pipe portion 94b, which is a cooling medium discharge port, at an intermediate position in the direction of arrow C toward the horizontal direction or inclined from the horizontal direction.

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

  First, as shown in FIG. 2, an oxidant gas such as an oxygen-containing gas is supplied from the oxidant gas supply manifold member 68a of the first end plate 18a to the oxidant gas supply communication hole 46a. A fuel gas such as a hydrogen-containing gas is supplied from the fuel gas supply manifold member 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, a cooling medium such as pure water, ethylene glycol, or oil is supplied from the inlet pipe portion 94a of the cooling medium supply manifold member 72a to the internal space 72ac. . The cooling medium is distributed to a pair of cooling medium supply communication holes 50a communicating with the upper and lower sides of the internal space 72ac.

  Therefore, as shown in FIG. 3, the oxidant gas is introduced into the oxidant gas flow path 58 of the first metal 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 second metal 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 pair of upper and lower cooling medium supply communication holes 50 a is introduced into the cooling medium flow path 62 between the first metal separator 42 and the second metal separator 44. The cooling medium once flows in the direction of arrow C in the direction approaching each other from the pair of cooling medium supply communication holes 50a, and then moves in the direction of arrow A to cool the electrolyte membrane / electrode structure 40. The cooling medium moves outward in the direction of arrow C in a direction away from each other, and is then discharged in the direction of arrow B along the pair of upper and lower cooling medium discharge communication holes 50b.

  As shown in FIG. 1, the cooling medium is discharged from the pair of upper and lower cooling medium discharge communication holes 50b to the internal space 72bc of the cooling medium discharge manifold member 72b. The cooling medium flows to the center side of the internal space 72bc, and is then discharged to the outside from the outlet conduit portion 94b.

  In this case, in this embodiment, as shown in FIG. 1, an insulating plate 74a is disposed between the cooling medium supply manifold member 72a and the second end plate 18b. On the other hand, an insulating plate 74b is disposed between the cooling medium discharge manifold member 72b and the second end plate 18b.

  Therefore, the electrical insulation between the cooling medium supply manifold member 72a and the second end plate 18b and between the cooling medium discharge manifold member 72b and the second end plate 18b is good with a simple and economical configuration. Can be secured.

  In addition, as shown in FIGS. 4 and 5, the contact surface 74as of the insulating plate 74a laminated on the cooling medium supply manifold member 72a is the first except for the part that circulates the pair of cooling medium supply communication holes 50a and 50a. One recess 78a is formed. Accordingly, a first gap 96a is provided between the surface of the second end plate 18b and the contact surface 74as of the insulating plate 74a via the first recess 78a, and the second end plate 18b and the insulating plate 74a The electrical resistance increases. On the other hand, the cooling medium discharge manifold member 72b functions in the same manner as the cooling medium supply manifold member 72a.

  Thus, it is possible to satisfactorily suppress the fuel cell stack 10 and an external device (not shown) from being electrically connected via the cooling medium flowing through the cooling medium supply manifold member 72a and the cooling medium discharge manifold member 72b. Can be obtained.

  Further, as shown in FIGS. 4 and 6, the insulating plate 74a is formed with a second recess 80a communicating with the internal space 72ac of the cooling medium supply manifold member 72a. A second gap 98a is provided between the surface 74af of the insulating plate 74a and the mounting surface 72as of the cooling medium supply manifold member 72a via the second recess 80a.

  For this reason, the electrical resistance of the insulating plate 74a is increased, the capacity of the internal space 72ac is increased, and the cooling medium supply manifold member 72a can be effectively made compact. Moreover, since the shape of the internal space 72ac is simplified, molding is easily performed. On the other hand, the same effect can be obtained on the cooling medium discharge manifold member 72b side.

  In the present embodiment, the cooling medium supply manifold member 72a and the cooling medium discharge manifold member 72b are used as the fluid manifold members, but the present invention is not limited to this. For example, the present invention may be applied to a fluid manifold member through which fuel gas or oxidant gas is circulated.

DESCRIPTION OF SYMBOLS 10 ... Fuel cell stack 12 ... Fuel cell 12as ... Laminated body 18a, 18b ... End plate 26 ... Casing 40 ... Electrolyte membrane and electrode structure 42, 44 ... Metal 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 ... Oxidant gas Flow path 60 ... Fuel gas flow path 62 ... Cooling medium flow path 68a ... Oxidant gas supply manifold member 68b ... Oxidant gas discharge manifold member 70a ... Fuel gas supply manifold member 70b ... Fuel gas discharge manifold member 72a ... Cooling medium supply manifold Member 72ac ... Internal space 72b ... Cooling medium discharge manifold Member 74a ... Insulating plate 76a ... Cooling medium inlet 78a, 80a ... Recess 94a ... Inlet pipe part 94b ... Outlet pipe part 96a, 98a ... Gap

Claims (4)

A fuel cell that generates electric power by an electrochemical reaction between a fuel gas and an oxidant gas, and a plurality of the fuel cells are stacked, and a fluid communication hole for circulating a cooling medium in the fuel cell is provided along the stacking direction. A plurality of stacked bodies, end plates are disposed at both ends of the stacked body in the stacking direction, and at least one end plate has openings of the plurality of fluid communication holes through which the cooling medium flows. together they are formed, a fuel cell stack fluid manifold member is provided having an internal space for and the through coolant flow communication with said plurality of fluid communication holes,
An insulating plate is disposed between the one end plate and the mounting surface of the fluid manifold member,
A through hole is formed in the insulating plate so as to overlap the openings of the plurality of fluid communication holes to communicate the internal space of the fluid manifold member with the plurality of fluid communication holes. Fuel cell stack. The fuel cell stack according to claim 1, wherein the insulating plate has a contact surface that contacts the one end plate,
The fuel cell stack is characterized in that a gap is formed on the contact surface except for a portion that circulates around the fluid communication hole. The fuel cell stack according to claim 2, wherein the gap is, the fuel cell stack, characterized in that it is constituted by the front Symbol recess formed in the insulating plate. 4. The fuel cell stack according to claim 1, wherein the plurality of fluid communication holes are a pair of cooling medium supply communication holes and a pair of cooling medium discharge communication holes. 5. And fuel cell stack.

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