JP6420801B2 - Fuel cell stack - Google Patents

Description

  The present invention relates to a fuel cell stack having a power generation cell in which an electrolyte membrane / electrode structure provided with electrodes on both sides of an electrolyte membrane and a separator are stacked, and a plurality of the power generation cells are stacked.

  For example, a polymer electrolyte fuel cell has an electrolyte membrane / electrode structure (MEA) in which an anode electrode is disposed on one surface of an electrolyte membrane made of a polymer ion exchange membrane and a cathode electrode is disposed on the other surface. It has. The electrolyte membrane / electrode structure constitutes a power generation cell by being sandwiched between separators. A fuel cell is usually incorporated in a fuel cell vehicle as an in-vehicle fuel cell stack, for example, by stacking a predetermined number of power generation cells and disposing end plates at both ends in the stacking direction.

  In the fuel cell, various sensors are attached in order to suitably control the operation state, the stop state, and the like. For example, when the operation of the fuel cell is completed, a scavenging process for removing moisture in the fuel cell with dry air is performed. At that time, a fuel cell system disclosed in Patent Document 1 is known in order to accurately grasp the amount of water in the fuel cell.

In the fuel cell system, among the fuel cells in the standing state after the end of operation of the fuel cell system includes a temperature sensor for detecting the temperature in a relatively small portion temperature drop with respect to the elapsed time under the influence of condensable heat . Then, the temperature detected by the temperature sensor is handled as the internal temperature of the fuel cell, and the internal water content of the fuel cell is estimated based on the behavior of the temperature at the time when the temperature decrease is small.

  Specifically, a temperature sensor is disposed in a power generation cell disposed substantially at the center in the stacking direction of the fuel cell stack. That is, in the power generation cell, an oxidant gas manifold is formed in the separator, and a temperature sensor is disposed in the oxidant gas manifold. The temperature change at the surface of the oxidizing gas manifold approximates the temperature change inside the fuel cell stack. For this reason, the surface temperature of the oxidizing gas manifold is detected, and the detected temperature can be handled as the internal temperature of the fuel cell stack.

JP 2010-282823 A

  However, in the above-mentioned Patent Document 1, since the temperature sensor is attached to the power generation cell inside the fuel cell stack, the operation of attaching the temperature sensor becomes complicated, and the replacement operation and the like are considerably troublesome. .

  Therefore, it is desired to attach various sensors such as a temperature sensor to the outside of the fuel cell stack. In the fuel cell stack, fluid (fuel gas, oxidant gas, or cooling medium) is supplied to or discharged from at least one end plate connected to each communication hole (reaction gas communication hole, cooling medium communication hole, etc.) inside the stack. A fluid manifold is provided. For this reason, it is possible to attach a sensor to the fluid manifold exposed to the outside of the end plate.

  However, each communication hole provided in the power generation cell has a rectangular shape, for example, a rectangular shape or a trapezoidal shape, while the external pipe connected to the fluid manifold is set to a cylindrical shape or the like. There are many cases. Therefore, the fluid manifold has a problem that the shape of the internal fluid flow path is complicated and it is difficult to perform sensing with a sensor with high accuracy.

  The present invention has been made in connection with this type of technology, and an object of the present invention is to provide a fuel cell stack that can accurately measure with a sensor member with a simple and economical configuration.

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

A manifold member that connects the fluid communication hole and the external pipe is provided on the surface of one end plate. The manifold member has a first opening located outside one of the end plates and connected to the fluid communication hole, and an opening shape adjacent to the first opening and connected to the external pipe and different from the first opening. And a second opening. And the sensing part of the sensor member which detects the state of fluid is arranged in the field where the opening shape of the 1st opening and the opening shape of the 2nd opening overlap in the front view of one end plate.

Further, sensor member has a rod-like shape, Ru are arranged in a direction intersecting the flow direction of the fluid.

Sensor member has a temperature sensor of the rod-like shape, the temperature sensor, from above in the gravity direction of the side of the second opening downward, Ru is arranged obliquely.

  In this fuel cell stack, the sensor member has a sensor bracket attached to the manifold member, a temperature sensor is provided on one end side of the sensor bracket, and an attachment screw that is screwed to the manifold member on the other end side of the sensor bracket. Is preferably provided.

  In this fuel cell stack, the manifold member has a hollow cylindrical main body portion provided with a second opening, and a thick portion protruding outward from the outer peripheral portion of the main body portion. It is preferable that a screw hole into which the mounting screw is screwed is formed.

  In this fuel cell stack, the first opening is a non-circular shape having a major axis and a minor axis, and the size of the first opening along the major axis is preferably larger than the second opening. .

  In this fuel cell stack, it is preferable that the sensing site is disposed at the center in the width direction of the first opening and the second opening.

  According to the present invention, the sensing part of the sensor member is arranged in a region where the opening shape of the first opening and the opening shape of the second opening overlap in the front view of the end plate. Therefore, since the sensing part of the sensor member is reliably arranged in the region where the fluid flows between the first opening and the second opening, the state of the fluid can be grasped well. As a result, it is possible to accurately measure with the sensor member with a simple and economical configuration.

It is a schematic perspective view from the 1st end plate side of the fuel cell stack concerning the embodiment of the present invention. It is a principal part disassembled perspective explanatory drawing of the electric power generation cell which comprises the said fuel cell stack. It is the III-III sectional view taken on the line of FIG. 2 of the said electric power generation cell. FIG. 3 is an exploded perspective view of an oxidant gas discharge manifold member and a sensor member that constitute the fuel cell stack. It is front explanatory drawing of the said oxidizing gas discharge manifold member. It is front explanatory drawing of the oxidizing gas discharge manifold member which is a comparative example. It is explanatory drawing of the temperature detection transition by the oxidizing gas discharge manifold member of this application, and the oxidizing gas discharge manifold member which is the said comparative example.

  As shown in FIG. 1, the fuel cell stack 10 according to the embodiment of the present invention is mounted on, for example, a fuel cell electric vehicle (not shown). In the fuel cell stack 10, a plurality of power generation cells 12 are stacked in the horizontal direction (arrow B direction) with the electrode surface in an upright posture. Note that the fuel cell stack 10 may be configured by stacking a plurality of power generation cells 12 in the direction of gravity (arrow C direction).

  At one end of the power generation cell 12 in the stacking direction, a first terminal plate 14a, a first insulating plate 16a, and a first end plate 18a are sequentially disposed outward. At the other end of the power generation cell 12 in the stacking direction, a second terminal plate 14b, a second insulating plate 16b, and a second end plate 18b are sequentially disposed outward.

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

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

  As shown in FIG. 2, the power generation cell 12 includes an electrolyte membrane / electrode structure 26, and an anode separator 28 and a cathode separator 30 that sandwich the electrolyte membrane / electrode structure 26.

  The anode separator 28 and the cathode separator 30 are made of, for example, a steel plate, a stainless steel plate, an aluminum plate, a plated steel plate, or a metal plate obtained by performing a surface treatment for corrosion prevention on the metal surface. The anode separator 28 and the cathode separator 30 have a rectangular shape (rectangular shape or square shape), and are formed into a concavo-convex shape by pressing a metal thin plate into a wave shape. For example, a carbon separator may be used as the anode separator 28 and the cathode separator 30 instead of the metal separator.

  One end edge of the power generation cell 12 in the long side direction (arrow A direction) communicates with each other in the arrow B direction, and an oxidant gas inlet communication hole (fluid communication hole) 32a, a cooling medium inlet communication hole (fluid communication hole). ) 34a and a fuel gas outlet communication hole (fluid communication hole) 36b. The oxidant gas inlet communication hole 32a supplies an oxidant gas, for example, an oxygen-containing gas. The cooling medium inlet communication hole 34a supplies a cooling medium, and the fuel gas outlet communication hole 36b discharges a fuel gas, for example, a hydrogen-containing gas.

  The oxidant gas inlet communication hole 32a, the cooling medium inlet communication hole 34a, and the fuel gas outlet communication hole 36b are non-circular communication holes and have, for example, a substantially rectangular shape. The oxidant gas inlet communication hole 32a, the cooling medium inlet communication hole 34a, and the fuel gas outlet communication hole 36b may have various shapes such as square, trapezoid, pentagon, substantially triangle, rhombus, polygon, ellipse, and the like. The combination can be set, and the shape is not particularly limited. Moreover, it is preferable that the corner | angular part of each side is made into R shape (curved shape).

  The other end edge in the long side direction of the power generation cell 12 communicates with each other in the direction of arrow B, and includes a fuel gas inlet communication hole (fluid communication hole) 36a, a cooling medium outlet communication hole (fluid communication hole) 34b, and an oxidizing agent. A gas outlet communication hole (fluid communication hole) 32b is provided. The fuel gas inlet communication hole 36a supplies fuel gas, the cooling medium outlet communication hole 34b discharges the cooling medium, and the oxidant gas outlet communication hole 32b discharges the oxidant gas.

  The fuel gas inlet communication hole 36a, the cooling medium outlet communication hole 34b, and the oxidant gas outlet communication hole 32b are non-circular like the oxidant gas inlet communication hole 32a, the cooling medium inlet communication hole 34a, and the fuel gas outlet communication hole 36b. It is a communication hole.

  As shown in FIG. 3, the electrolyte membrane / electrode structure 26 includes, for example, a solid polymer electrolyte membrane 38 in which a perfluorosulfonic acid thin film is impregnated with water, and an anode electrode sandwiching the solid polymer electrolyte membrane 38 40 and a cathode electrode 42.

  The anode electrode 40 includes a gas diffusion layer 40a made of carbon paper or the like, and an electrode catalyst layer formed by uniformly applying porous carbon particles carrying a platinum alloy on the surface of the gas diffusion layer 40a. 40b. The electrode catalyst layer 40 b is formed on one surface of the solid polymer electrolyte membrane 38.

  The cathode electrode 42 includes a gas diffusion layer 42a made of carbon paper or the like, and an electrode catalyst layer formed by uniformly applying porous carbon particles carrying a platinum alloy on the surface of the gas diffusion layer 42a. 42b. The electrode catalyst layer 42 b is formed on the other surface of the solid polymer electrolyte membrane 38.

  As shown in FIG. 2, a fuel gas flow path 44 that connects the fuel gas inlet communication hole 36a and the fuel gas outlet communication hole 36b is formed on the surface 28a of the anode separator 28 that faces the electrolyte membrane / electrode structure 26. The The fuel gas channel 44 is formed by a plurality of straight channel grooves (or wave-shaped channel grooves) extending in the direction of arrow A.

  An oxidant gas flow path 46 that connects the oxidant gas inlet communication hole 32a and the oxidant gas outlet communication hole 32b is formed on the surface 30a of the cathode separator 30 facing the electrolyte membrane / electrode structure 26. The oxidant gas flow path 46 is formed by a plurality of linear flow path grooves (or wavy flow path grooves) extending in the direction of arrow A.

  Between the surface 28b of the anode separator 28 and the surface 30b of the adjacent cathode separator 30, a cooling medium flow path 48 communicating with the cooling medium inlet communication hole 34a and the cooling medium outlet communication hole 34b is formed. The cooling medium flow path 48 extends in the horizontal direction and allows the cooling medium to flow over the electrode range of the electrolyte membrane / electrode structure 26.

  A first seal member 50 is integrally formed on the surfaces 28 a and 28 b of the anode separator 28 around the outer peripheral edge of the anode separator 28. A second seal member 52 is integrally formed on the surfaces 30 a and 30 b of the cathode separator 30 around the outer peripheral edge of the cathode separator 30.

  As the first seal member 50 and the second seal member 52, 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. 1, an oxidant gas supply manifold member 54a, an oxidant gas discharge manifold member 54b, a fuel gas supply manifold member 56a, and a fuel gas discharge manifold member 56b are mounted on the first end plate 18a. The oxidant gas supply manifold member 54a, the oxidant gas discharge manifold member 54b, the fuel gas supply manifold member 56a, and the fuel gas discharge manifold member 56b are formed of a resin material. As the resin material, for example, PBT (polybutylene terephthalate), PPS (polyphenylene sulfide), PPE (polyphenylene ether), PAI (polyamideimide), or the like is used. Note that the manifold members may be integrally formed on the first end plate 18a.

  The oxidant gas discharge manifold member 54b has a flange portion 58 protruding outward. A plurality of, for example, four hole portions 60 are formed in the flange portion 58, while a screw hole 62 is formed coaxially with each hole portion 60 in the first end plate 18 a. The bolt 64 is inserted into the hole 60 and screwed into the screw hole 62, whereby the flange 58 is fixed to the first end plate 18a.

  The flange portion 58 is integrally formed at one end of the substantially cylindrical main body portion 66. As shown in FIGS. 4 and 5, the main body portion 66 is opened at the end on the flange portion 58 side, and is a non-circular first opening portion that is continuous with the oxidizing gas outlet communication hole 32 b, for example, a substantially rectangular shape. 68 is formed. The first opening 68 has a non-circular shape having a major axis 68a and a minor axis 68b. The first opening 68 has the same shape as the oxidant gas outlet communication hole 32b.

  As shown in FIG. 1, a circular external pipe 70 is connected to the main body 66, and a circular second opening 72 that is continuous with the circular external pipe 70 is provided. Although not shown, external devices such as an on-off valve and a fluid pressure device are connected to the circular external pipe 70. As shown in FIG. 5, the opening dimension D1 of the first opening 68 along the long axis 68a is larger than the opening dimension D3 of the second opening 72 (diameter of the circular second opening 72). That is, the first opening 68 is longer than the second opening 72 in the vertical direction (the direction of the arrow C parallel to the long axis 68a). The opening dimension D3 of the second opening 72 (the diameter of the circular second opening 72) is larger than the opening dimension D2 of the first opening 68 along the short axis 68b.

  As shown in FIG. 4, a mounting base (thick part) 74 is integrally formed on a part of the outer periphery of the main body 66. The mounting base 74 protrudes outward from the outer peripheral portion of the main body 66. A screw hole 76 is formed in the mounting base 74. The screw hole 76 does not penetrate the main body 66 and does not reach the inside of the main body 66. The mounting base 74 forms a flat surface 74f, and a screw hole 76 and a hole 78 are formed in parallel on the flat surface 74f. The screw hole 76 is formed below the hole 78. As shown in FIG. 5, the flat surface 74 f is inclined with respect to the major axis 68 a and the minor axis 68 b of the first opening 68. The hole 78 passes through the main body 66 and the mounting base 74. The protruding height from the main body 66 of the portion where the screw hole 76 of the mounting base 74 is formed is higher than the protruding height from the main body 66 of the portion where the hole 78 of the mounting base 74 is mounted.

  A sensor bracket 81 constituting the sensor member 80 is attached to the mounting base 74. A hole 82 is formed in the sensor bracket 81, and a bolt (attachment screw) 84 inserted into the hole 82 is screwed into the screw hole 76. The sensor bracket 81 is provided with a rod-shaped temperature sensor 86, and the temperature sensor 86 is inserted into the hole 78 and disposed inside the main body 66. The temperature sensor 86 is inserted into the hole 78 obliquely from the upper side to the lower side in the direction of gravity. That is, the temperature sensor 86 is held by the sensor bracket 81 so as to approach the lower side toward the distal end side (the sensing part 86s side). Thereby, since the water droplets adhering to the temperature sensor 86 fall from the tip of the temperature sensor 86 due to gravity, the water droplet is reliably prevented from flowing back to the cable connected to the temperature sensor 86. A seal member (for example, an O-ring or a fluid seal) is provided between the temperature sensor 86 and the hole 78. The temperature sensor 86 is inserted into the oxidant gas discharge manifold member 54b along the surface direction of the first end plate 18a.

  As shown in FIG. 5, the first opening 68 and the second opening 72 have different opening shapes, and the first opening 68 is offset upward with respect to the center of the second opening 72. Provided. A region 88 is formed in which the opening shape of the first opening 68 and the opening shape of the second opening 72 overlap in the front view of the first end plate 18a. In the region 88, a sensing part 86s at the tip of the temperature sensor 86 is arranged. The hole 78 is a region that is out of the region 88 and opens on the inner peripheral surface of the main body 66. When viewed from the front of the first end plate 18a, the center of the first opening 68 in the width direction (the arrow A direction parallel to the short axis 68b in FIG. 5) coincides with the center of the second opening 72 in the width direction. To do. The sensing part 86 s is disposed at substantially the center in the width direction of the first opening 68 and the second opening 72.

  The oxidant gas supply manifold member 54a, the fuel gas supply manifold member 56a, and the fuel gas discharge manifold member 56b are configured in the same manner as the oxidant gas discharge manifold member 54b except for the mounting base 74. The same components are denoted by the same reference numerals, and detailed description thereof is omitted.

  Although not shown, a cooling medium supply manifold member that communicates with the cooling medium inlet communication hole 34a and a cooling medium discharge manifold member that communicates with the cooling medium outlet communication hole 34b are attached to the second end plate 18b.

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

  First, as shown in FIG. 1, an oxidizing gas such as an oxygen-containing gas is supplied from the oxidizing gas supply manifold member 54a of the first end plate 18a to the oxidizing gas inlet communication hole 32a. Fuel gas such as hydrogen-containing gas is supplied from the fuel gas supply manifold member 56a of the first end plate 18a to the fuel gas inlet communication hole 36a.

  On the other hand, a coolant such as pure water, ethylene glycol, or oil is supplied from a coolant supply manifold member (not shown) of the second end plate 18b to the coolant supply passage 34a.

  Thereby, as shown in FIG. 2, the oxidant gas is introduced into the oxidant gas flow path 46 of the cathode separator 30 from the oxidant gas inlet communication hole 32a. The oxidant gas moves in the direction of arrow A along the oxidant gas flow path 46 and is supplied to the cathode electrode 42 of the electrolyte membrane / electrode structure 26.

  On the other hand, the fuel gas is supplied to the fuel gas passage 44 of the anode separator 28 from the fuel gas inlet communication hole 36a. The fuel gas moves in the direction of arrow A along the fuel gas flow path 44 and is supplied to the anode electrode 40 of the electrolyte membrane / electrode structure 26.

  Therefore, in the electrolyte membrane / electrode structure 26, the oxidant gas supplied to the cathode electrode 42 and the fuel gas supplied to the anode electrode 40 are consumed by the electrochemical reaction in the electrode catalyst layers 42b and 40b. Power generation.

  Next, the oxidant gas, which is supplied to the cathode electrode 42 of the electrolyte membrane / electrode structure 26 and partially consumed, flows in the direction of the arrow B along the oxidant gas outlet communication hole 32b, and is then oxidant gas discharge manifold. It is discharged from the member 54b (see FIG. 1). On the other hand, the fuel gas, which is supplied to the anode electrode 40 of the electrolyte membrane / electrode structure 26 and partially consumed, flows in the direction of arrow B along the fuel gas outlet communication hole 36b, from the fuel gas discharge manifold member 56b. Discharged.

  As shown in FIG. 2, the cooling medium supplied to the cooling medium inlet communication hole 34 a is introduced into the cooling medium flow path 48 between the cathode separator 30 and the anode separator 28. The cooling medium moves in the direction of arrow A to cool the electrolyte membrane / electrode structure 26, and then is discharged to the cooling medium outlet communication hole 34b. The cooling medium is discharged from the second end plate 18b.

  In this case, in this embodiment, as shown in FIGS. 4 and 5, the oxidant gas discharge manifold member 54 b includes a non-circular first opening 68 and a circular second opening 72. It is provided in communication. The first opening 68 communicates with the non-circular oxidant gas outlet communication hole 32 b of the power generation cell 12, while the second opening 72 communicates with the circular external pipe 70.

  The first opening 68 and the second opening 72 have different opening shapes, and the first opening 68 is provided so as to be offset upward with respect to the center of the second opening 72. An area 88 is formed in which the opening shape of the first opening 68 and the opening shape of the second opening 72 overlap in a front view of the first end plate 18a, and the sensing portion of the temperature sensor 86 is formed in the area 88. 86s is arranged (see FIG. 5).

  Accordingly, the sensing portion 86s of the temperature sensor 86 is reliably disposed in the region 88 in which the oxidant gas (fluid) flows between the first opening 68 and the second opening 72, and thus the oxidant gas. The temperature (state) of can be grasped well.

  Specifically, temperature detection was performed using the oxidant gas discharge manifold member 54b of the present application and the oxidant gas discharge manifold member 54ref. Which is a comparative example shown in FIG. In the oxidant gas discharge manifold member 54ref., The sensing portion 86s of the temperature sensor 86 is disposed outside the region 88 where the opening shape of the first opening 68 and the opening shape of the second opening 72 overlap. Since the flow rate distribution and the temperature distribution also exist in the region 88, the temperature can be measured no matter where the sensing portion 86s is arranged in the region 88 at a high flow rate. However, when the flow rate is low, the flow of fluid may be weak in a region closer to the outside in the region 88, so the sensing portion 86 s is preferably disposed at the center in the region 88.

  Therefore, the operation of the fuel cell stack 10 was stopped, the scavenging process of the oxidant gas passage 46 with dry air was performed, and the temperature of the oxidant gas outlet communication hole 32b was detected. As a result, as shown in FIG. 7, in the oxidant gas discharge manifold member 54b of the present application, the temperature detected by the temperature sensor 86 is a value that approximates the in-plane temperature of the electrolyte membrane / electrode structure 26.

  On the other hand, in the oxidant gas discharge manifold member 54ref., Since the sensing portion 86s of the temperature sensor 86 is disposed outside the region 88, the sensing accuracy is deteriorated particularly when the oxidant gas is at a low flow rate. Therefore, in the comparative example, the temperature detected by the temperature sensor 86 is considerably lower than the in-plane temperature of the electrolyte membrane / electrode structure 26.

  Thereby, in this embodiment, it is only necessary to arrange the sensing part 86s of the temperature sensor 86 in the region 88, and it is possible to accurately measure the temperature sensor 86 with a simple and economical configuration. An effect is obtained.

  In the present embodiment, the configuration in which the sensor member 80 is attached to the oxidant gas discharge manifold member 54b is adopted. However, the present invention is not limited to this. For example, the sensor member may be provided on at least one of the oxidant gas supply manifold member 54a, the fuel gas supply manifold member 56a, the fuel gas discharge manifold member 56b, the cooling medium supply manifold member, or the cooling medium discharge manifold member.

  Further, the sensor member 80 is not limited to the temperature sensor 86. As the sensor member 80, various sensors such as a pressure sensor, a humidity sensor, a hydrogen sensor, or an oxygen sensor can be used. In addition, the attachment structure of the sensor member 80 is not limited to this embodiment, The sensing site | part 86s should just be arrange | positioned in the area | region 88. FIG.

DESCRIPTION OF SYMBOLS 10 ... Fuel cell stack 12 ... Power generation cell 18a, 18b ... End plate 26 ... Electrolyte membrane electrode assembly 28 ... Anode separator 30 ... Cathode separator 32a ... Oxidant gas inlet communication hole 32b ... Oxidant gas outlet communication hole 34a ... Cooling Medium inlet communication hole 34b ... Cooling medium outlet communication hole 36a ... Fuel gas inlet communication hole 36b ... Fuel gas outlet communication hole 38 ... Solid polymer electrolyte membrane 40 ... Anode electrode 42 ... Cathode electrode 44 ... Fuel gas flow path 46 ... Oxidant Gas channel 48 ... Cooling medium channel 54a ... Oxidant gas supply manifold member 54b ... Oxidant gas discharge manifold member 56a ... Fuel gas supply manifold member 56b ... Fuel gas discharge manifold member 58 ... Flange portion 66 ... Main body portions 68, 72 ... Opening 70 ... Circular external pipe 74 ... Mounting stand 76 ... Screw hole 8,82 ... holes 80 ... sensor member 86 ... temperature sensor 86s ... sensing portion 88 ... region

Claims (5)

An electrolyte membrane / electrode structure in which electrodes are provided on both sides of the electrolyte membrane, and a power generation cell in which a separator is stacked, and end plates are disposed at both ends in the stacking direction in which the plurality of power generation cells are stacked, A fuel cell stack provided with fluid communication holes for flowing a reaction gas or a fluid as a cooling medium in a stacking direction of the power generation cells,
On the surface of one of the end plates, a manifold member that connects the fluid communication hole and external piping is provided,
The manifold member has a first opening located outside the one end plate and connected to the fluid communication hole;
A second opening adjacent to the first opening and connected to the external pipe and having an opening shape different from the first opening;
Provided,
In a front view of one of the end plates, in a region where the opening shape of the first opening and the opening shape of the second opening overlap, a sensing portion of a sensor member that detects the state of the fluid is disposed ,
The sensor member has a rod-like shape and is arranged toward a direction intersecting the fluid flow direction,
The sensor member has a rod-shaped temperature sensor,
The temperature sensor, the second from above in the gravity direction of the side of the opening downward, the fuel cell stack, wherein Rukoto arranged obliquely. The fuel cell stack according to claim 1 Symbol placement, the sensor member has a sensor bracket attached to the manifold member,
The temperature sensor is provided on one end side of the sensor bracket,
A fuel cell stack, wherein an attachment screw that is screwed into the manifold member is provided on the other end side of the sensor bracket. 3. The fuel cell stack according to claim 2 , wherein the manifold member has a hollow cylindrical main body portion provided with the second opening and a thick portion protruding outward from an outer peripheral portion of the main body portion. And
A fuel cell stack, wherein a screw hole into which the mounting screw is screwed is formed in the thick part. The fuel cell stack according to any one of claims 1 to 3 , wherein the first opening is a non-circular shape having a major axis and a minor axis.
The fuel cell stack, wherein a size of the first opening along the major axis is larger than that of the second opening. The fuel cell stack according to any one of claims 1-4, wherein the sensing portion is a fuel cell characterized by being arranged in the width direction of the center of the second opening and the first opening stack.

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