JP2013077523A - Fuel cell device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fuel cell device capable of supporting a discharge passage of fuel gas or oxidant gas in a plurality of fuel battery cells to be secured while permitting the un-uniform elongation of the fuel battery cells.SOLUTION: The fuel cell device is arranged so that a downstream side end of respective fuel battery cells 16 is formed so as to penetrate through a support hole 101 and protrude from a support plate 100 as well as a gap is formed between the down stream side end and the support hole 101 so that a relative movement between the support plate 100 and the fuel battery cells 16 are permitted while maintaining a state that the support plate 100 supports the fuel battery cells 16.

Description

  The present invention relates to a fuel cell device that generates power using a fuel gas and an oxidant gas.

  As such a fuel cell device, one having a plurality of fuel cell cells each having an internal flow path through which fuel gas or oxidant gas passes and electrically connected to each other is known (for example, See Patent Document 1 below). The plurality of fuel cells are configured to cause a power generation reaction by passing the fuel gas or the oxidant gas through the internal flow path while passing the other gas to the outside. In addition, since the fuel gas or the oxidant gas needs to be distributed to the plurality of fuel cells, the lower end, which is the upstream end, is supported by the gas manifold. Furthermore, since the fuel gas or oxidant gas distributed to each fuel cell needs to be discharged to the outside (upward) after passing through the internal flow path of the fuel cell, it is at the downstream end thereof. The lower end is supported while securing a discharge channel communicating with the internal channel.

JP 2009-146623 A

  In the conventional fuel cell device described above, the lower ends, which are upstream ends of the plurality of fuel cells, are fixed so as not to drop off from the gas manifold, and the upper ends, which are downstream ends, are also fixed to the support plate. It is fixed.

  By the way, since the plurality of fuel cells are housed in the casing and receive the supply of the fuel gas and the oxidant gas to perform the power generation reaction, the power generation reaction is performed in a sealed space. Accordingly, there is a difference between the temperature in the vicinity of the fuel battery cell disposed on the outer side closer to the inner wall of the casing and the temperature in the vicinity of the fuel battery cell disposed in the center, and the temperature on the center side tends to increase.

  Accordingly, the amount of extension of each of the plurality of fuel cells in the operating environment is not uniform, and a fuel cell that extends more and a fuel cell that extends relatively less are mixed. In such a situation, when both ends of a plurality of fuel cells are fixed and fixed to a rigid gas manifold or support plate, the fuel cells that expand more are subjected to a load on the compression side, and the fuel that extends relatively less The battery cell receives a load on the stretch side. Such a compression or expansion load may lead to a failure of each fuel cell itself.

  On the other hand, in order to avoid receiving a load of compression or expansion, if the sticking between the upper end, which is the downstream end of the plurality of fuel cells, and the support plate are simply eliminated, the support plate is expanded when the fuel cell is extended. May shift the position of the fuel cell, preventing the flow of the fuel gas or oxidant gas discharged from the internal flow path of the fuel cell, making it impossible to secure the above-described fuel gas or oxidant gas discharge flow path. . If the fuel gas or oxidant gas discharge passage cannot be secured, the airflow inside the casing is disturbed, and there is a concern that the desired power generation cannot be performed. Therefore, it is required to support the fuel gas or the oxidant gas discharge passage in the plurality of fuel cells while allowing the non-uniform elongation of the plurality of fuel cells.

  The present invention has been made in view of such a problem, and an object of the present invention is a fuel cell device that generates power by using a fuel gas and an oxidant gas, and allows non-uniform elongation of a plurality of fuel cells. On the other hand, it is an object of the present invention to provide a fuel cell device capable of supporting the fuel gas or oxidant gas discharge channel in the plurality of fuel cells.

  In order to solve the above-described problems, a fuel cell device according to the present invention is a fuel cell device that generates power using fuel gas and oxidant gas, each having an internal flow path through which fuel gas or oxidant gas passes. A plurality of fuel cells electrically connected to each other, and an upstream end portion into which the fuel gas or oxidant gas flows into the plurality of fuel cells, and each of the fuel cells has a fuel gas or an oxidation A gas manifold that distributes and supplies the agent gas; and a support plate that supports a downstream end from which the fuel gas or the oxidant gas flows out of the plurality of fuel cells. The support plate is provided with a support hole that penetrates and supports the downstream end of each of the plurality of fuel cells, and the downstream end penetrates the support hole from the support plate. A gap is formed between the downstream end and the support hole so as to allow relative movement while maintaining the state where the support plate supports the plurality of fuel cells. Is formed.

  In the present invention, a support plate that supports the downstream end of each of the plurality of fuel cells is provided with a support hole that penetrates the downstream end, and a gap is formed between the support hole and the downstream end. Therefore, relative movement between the support plate and the fuel battery cell can be allowed. Further, since the downstream end protrudes from the support plate and the downstream end is supported by the support plate, the gas flowing through the internal flow path of the fuel cell is smoothly discharged to the outside. Does not obstruct the flow. Accordingly, there is provided a fuel cell device capable of supporting a fuel gas or an oxidant gas discharge channel in the plurality of fuel cells while ensuring non-uniform elongation of the plurality of fuel cells. be able to.

  In the fuel cell device according to the present invention, the fuel cell preferably includes a single cell having a fuel electrode, an air electrode, and an electrolyte layer, and caps provided at both ends of the single cell.

  In this preferred embodiment, one of the caps provided at both ends of the single cell moves relative to the support hole, and a part of the cap slides in the support hole, so that the single cell is not damaged unnecessarily. Can be suppressed.

  In the fuel cell device according to the present invention, the cap has a small-diameter portion that is inserted through the support hole, and a large-diameter portion that is fitted into the single cell and has an outer diameter larger than the inner diameter of the support hole. It is also preferable.

  In this preferred embodiment, the small diameter portion of the cap slides in the support hole, so that the plurality of fuel cells can be supported while being positioned. In addition, since the support hole has a large-diameter portion whose outer diameter is larger than the inner diameter of the support hole, the large-diameter portion abuts on the support plate to allow relative movement between the support plate and the fuel cell. However, the support plate can be continuously supported within a preset height range.

  In the fuel cell device according to the present invention, it is preferable that the support hole has a tapered portion whose diameter increases on the side facing the large diameter portion.

  In this preferred embodiment, the tapered hole is formed in the support hole on the side facing the large-diameter portion, so that a large gap is formed in the expanded diameter portion, and the relative movement between the support plate and the fuel cell unit is performed. Allowed more smoothly.

  According to the present invention, there is provided a fuel cell device that generates power using fuel gas and oxidant gas, and allows fuel gas or oxidant in the plurality of fuel cells while allowing non-uniform elongation of the plurality of fuel cells. It is possible to provide a fuel cell device that can be supported so as to secure a gas discharge passage.

It is a perspective view which shows the external appearance of the fuel cell module in embodiment of this invention. It is sectional drawing in the center vicinity of FIG. 1, Comprising: It is sectional drawing which shows the cross section seen from the A direction of FIG. It is sectional drawing in the center vicinity of FIG. 1, Comprising: It is sectional drawing which shows the cross section seen from the B direction of FIG. It is a perspective view which shows the state which removed some outer plates from the casing of FIG. FIG. 3 is a schematic diagram corresponding to FIG. 2, and is a schematic diagram showing flows of power generation air and combustion gas. FIG. 4 is a schematic diagram corresponding to FIG. 3, and is a schematic diagram showing flows of power generation air and combustion gas. It is a fragmentary sectional view which shows the fuel cell unit used for this embodiment. It is a perspective view which shows the structure of the fuel cell stack in this embodiment. It is a figure which expands and shows the joining relationship of an upper support plate and a fuel cell unit. It is a partial side view which shows a state when the expansion | extension amount of a fuel cell unit differs.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. In order to facilitate the understanding of the description, the same constituent elements in the drawings will be denoted by the same reference numerals as much as possible, and redundant description will be omitted.

  A fuel cell module (fuel cell device) according to an embodiment of the present invention will be described with reference to FIG. A fuel cell module 2 shown in FIG. 1 constitutes a part of a solid oxide fuel cell device. The solid oxide fuel cell device includes a fuel cell module 2 and an auxiliary unit (not shown).

  In FIG. 1, the height direction of the fuel cell module 2 is the y-axis direction. The x axis and the z axis are defined along a plane perpendicular to the y axis, the direction along the short direction of the fuel cell module 2 is defined as the x axis direction, and the direction along the longitudinal direction of the fuel cell module 2 is defined as z. Axial direction. The x-axis, y-axis, and z-axis described in FIG. 2 and thereafter are based on the x-axis, y-axis, and z-axis in FIG. Further, the direction along the negative direction of the z axis is the A direction, and the direction along the positive direction of the x axis is the B direction.

  The fuel cell module 2 includes a casing 56 that houses fuel cells (details will be described later), and a heat exchanger 22 that is provided on the upper portion of the casing 56. The inside of the casing 56 is a sealed space. A reformed gas supply pipe 60 and a water supply pipe 62 are connected to the casing 56. On the other hand, a power generation air introduction pipe 74 and a combustion gas discharge pipe 82 are connected to the heat exchanger 22.

  The to-be-reformed gas supply pipe 60 is a pipe line that supplies a to-be-reformed gas for reforming such as city gas into the casing 56. The water supply pipe 62 is a pipe for supplying water used when steam reforming the gas to be reformed. The power generation air introduction pipe 74 is a pipe for supplying power generation air (oxidant gas) for causing a power generation reaction with the reformed fuel gas. The combustion gas discharge pipe 82 is a pipe line for discharging the combustion gas generated as a result of burning the fuel gas after the power generation reaction.

  Next, the inside of the fuel cell module 2 will be described with reference to FIGS. 2 is a cross-sectional view of the fuel cell module 2 as viewed from the direction A in FIG. 1 in the vicinity of the center thereof. 3 is a cross-sectional view of the fuel cell module 2 as viewed from the direction B in FIG. 2 in the vicinity of the center thereof. FIG. 4 is a perspective view showing a state where a part of the casing 56 covering the fuel cell assembly is removed from the fuel cell module 2 shown in FIG.

  As shown in FIGS. 2 to 4, the fuel cell assembly 12 of the fuel cell module 2 is entirely covered with a casing 56. As shown in FIG. 4, the fuel cell assembly 12 as a whole has a substantially rectangular parallelepiped shape that is longer in the A direction than in the B direction. The upper surface on the reformer 20 side and the lower surface on the fuel gas tank 68 (gas manifold) side. , A long side surface extending along the direction A in FIG. 4 and a short side surface extending along the direction B in FIG.

  In the present embodiment, an evaporating mixer (not explicitly shown) for evaporating the water supplied from the water supply pipe 62 is provided inside the reformer 20. The evaporative mixer is heated by the combustion gas to convert water into water vapor, and to mix this water vapor with fuel gas (city gas) that is a reformed gas and air.

  The reformed gas supply pipe 60 and the water supply pipe 62 are both connected to the reformer 20 after being led into the casing 56. More specifically, as shown in FIG. 3, the reformer 20 is connected to an end on the right side in the drawing, which is an upstream end of the reformer 20.

  The reformer 20 is disposed further above the combustion chamber 18 formed above the fuel cell assembly 12. Accordingly, the reformer 20 is heated by the combustion heat of the remaining fuel gas and air after the power generation reaction, and is configured to serve as an evaporative mixer and a reformer that causes a reforming reaction. Has been.

  The upper end of the fuel supply pipe 66 is connected to the downstream end of the reformer 20 (the left end in FIG. 3). The lower end side 66 a of the fuel supply pipe 66 is disposed so as to enter the fuel gas tank 68.

  As shown in FIGS. 2 to 4, the fuel gas tank 68 is provided directly below the fuel cell assembly 12. The fuel gas tank 68 is fixed to the upper surface of the casing bottom plate 56a by using four fixing members 30 (details will be described later). Note that the number of fixing members 30 need not be four. The number and location of the fixing members 30 can be arbitrarily set in consideration of the size and weight of the fuel gas tank 68.

  A plurality of small holes (not shown) are formed along the longitudinal direction (A direction) on the outer periphery of the lower end side 66 a of the fuel supply pipe 66 inserted into the fuel gas tank 68. The fuel gas reformed by the reformer 20 is uniformly supplied in the longitudinal direction into the fuel gas tank 68 through the plurality of small holes (not shown). The fuel gas supplied to the fuel gas tank 68 is supplied into a fuel gas flow path (details will be described later) inside each fuel cell unit 16 constituting the fuel cell assembly 12, and the fuel cell unit 16 It rises up to reach the combustion chamber 18.

  Next, a structure for supplying power generation air to the inside of the fuel cell module 2 will be described with reference to FIGS. 2 to 4, 5, and 6. FIG. 5 is a schematic diagram corresponding to FIG. 2 and shows the flow of power generation air and combustion gas. The figure is a schematic view corresponding to FIGS. 6 and 3 and similarly shows the flow of power generation air and combustion gas. As shown in these drawings, a heat exchanger 22 is provided above the reformer 20. The heat exchanger 22 is provided with a plurality of combustion gas pipes 70 and a power generation air flow path 72 formed around the combustion gas pipes 70.

  A power generation air introduction pipe 74 is attached to one end side (the right end in FIG. 3) of the upper surface of the heat exchanger 22. With this power generation air introduction pipe 74, power generation air is introduced into the heat exchanger 22 from a power generation air flow rate adjustment unit (not shown).

  As shown in FIG. 2, a pair of outlet ports 76 a of the power generation air flow path 72 is formed on the other end side (the left end in FIG. 3) on the upper side of the heat exchanger 22. The outlet port 76a is connected to a pair of communication channels 76. Further, power generation air supply passages 77 are formed on the outer sides of both sides of the casing 56 of the fuel cell module 2 in the width direction (B direction: short side surface direction).

  Therefore, power generation air is supplied to the power generation air supply path 77 from the outlet port 76 a of the power generation air flow path 72 and the communication flow path 76. The power generation air supply path 77 is formed along the longitudinal direction of the fuel cell assembly 12. Furthermore, in order to blow out the air for power generation toward each fuel cell unit 16 of the fuel cell assembly 12 in the power generation chamber 10 at a position corresponding to the lower side of the fuel cell assembly 12 below the fuel cell assembly 12. A plurality of outlets 78a and 78b are formed. The power generation air blown out from these air outlets 78 a and 78 b flows from the lower side to the upper side along the outer side of each fuel cell unit 16.

  Subsequently, a structure for discharging combustion gas generated by combustion of fuel gas and power generation air will be described. The combustion gas generated above the fuel cell unit 16 rises in the combustion chamber 18 and reaches the rectifying plate 21. As shown in FIG. 6, the rectifying plate 21 is provided with an opening 21a, and the combustion gas is guided into the opening 21a. The combustion gas that has passed through the opening 21 a reaches the other end side of the heat exchanger 22. In the heat exchanger 22, a plurality of combustion gas pipes 70 are provided for discharging combustion gas generated by combustion of fuel gas and power generation air in the combustion chamber 18. A combustion gas discharge pipe 82 is connected to the downstream end side of these combustion gas pipes 70 so that the combustion gas is discharged to the outside.

  Next, the fuel cell unit 16 (corresponding to a fuel cell in the present invention) will be described with reference to FIG. FIG. 7 is a partial cross-sectional view showing the fuel cell unit 16 of the present embodiment.

  As shown in FIG. 7, the fuel cell unit 16 includes a fuel cell 84 (corresponding to a single cell in the present invention) and inner electrode terminals 86 respectively connected to the vertical ends of the fuel cell 84. And.

  The fuel cell 84 is a tubular structure extending in the vertical direction, and includes a cylindrical inner electrode layer 90 that forms a fuel gas flow path 88 therein, a cylindrical outer electrode layer 92, an inner electrode layer 90, and an outer side. An electrolyte layer 94 is provided between the electrode layer 92 and the electrode layer 92. The inner electrode layer 90 is a fuel electrode through which fuel gas passes and becomes a (−) electrode, while the outer electrode layer 92 is an air electrode in contact with air and becomes a (+) electrode.

  Since the inner electrode terminals 86 attached to the upper end side and the lower end side of the fuel cell unit 16 have the same structure, the inner electrode terminal 86 attached to the upper end side will be specifically described here. The upper portion 90 a of the inner electrode layer 90 includes an outer peripheral surface 90 b and an upper end surface 90 c exposed to the electrolyte layer 94 and the outer electrode layer 92. The inner electrode terminal 86 is connected to the outer peripheral surface 90b of the inner electrode layer 90 through a conductive sealing material 96, and is further in direct contact with the upper end surface 90c of the inner electrode layer 90, thereby Electrically connected. A fuel gas passage 98 communicating with the fuel gas passage 88 of the inner electrode layer 90 is formed at the center of the inner electrode terminal 86.

  The inner electrode layer 90 includes, for example, a mixture of Ni and zirconia doped with at least one selected from rare earth elements such as Ca, Y, and Sc, and Ni and ceria doped with at least one selected from rare earth elements. The mixture is formed of at least one of Ni and a mixture of lanthanum garade doped with at least one selected from Sr, Mg, Co, Fe, and Cu.

  The electrolyte layer 94 is, for example, zirconia doped with at least one selected from rare earth elements such as Y and Sc, ceria doped with at least one selected from rare earth elements, lanthanum gallate doped with at least one selected from Sr and Mg, Formed from at least one of the following.

  The outer electrode layer 92 includes, for example, lanthanum manganite doped with at least one selected from Sr and Ca, lanthanum ferrite doped with at least one selected from Sr, Co, Ni and Cu, Sr, Fe, Ni and Cu. It is formed from at least one of lanthanum cobaltite doped with at least one selected from the group consisting of silver and silver.

  Next, the fuel cell stack 14 will be described with reference to FIG. FIG. 8 is a perspective view showing the fuel cell stack 14 of the present embodiment.

  As shown in FIG. 8, the fuel cell stack 14 includes 16 fuel cell units 16, and the lower end side and the upper end side of these fuel cell units 16 are respectively made of a fuel gas tank upper plate 68 a and a ceramic product. It is supported by the upper support plate 100. The fuel gas tank upper plate 68a and the upper support plate 100 are formed with through holes through which the inner electrode terminal 86 can pass.

  Furthermore, a current collector 102 and an external terminal 104 are attached to the fuel cell unit 16. The current collector 102 electrically connects the inner electrode terminal 86 attached to the inner electrode layer 90 that is a fuel electrode and the outer peripheral surface of the outer electrode layer 92 that is the air electrode of the adjacent fuel cell unit 16. To do.

  Further, the external terminals 104 are connected to the inner electrode terminals 86 at the upper and lower ends of the two fuel cell units 16 located at the ends of the fuel cell stack 14. These external terminals 104 are connected to the external terminals 104 of the fuel cell unit 16 at the end of the adjacent fuel cell stack 14, and all 160 fuel cell units 16 are connected in series. Yes.

  Subsequently, FIG. 9 shows an enlarged connection relationship between the upper support plate 100 and the fuel cell unit 16. As shown in FIG. 9, the upper support plate 100 is formed with a support hole 101 for inserting the upper end, which is the downstream end of each fuel cell unit 16. The support hole 101 has a tapered portion whose diameter increases on the fuel cell unit 16 side.

  The fuel battery cell unit 16 as a fuel battery cell is configured by attaching inner electrode terminals 86 as caps to both ends of a fuel battery cell 84 as a single cell. The inner electrode terminal 86 as a cap has a small diameter portion 86a and a large diameter portion 86b. A small diameter portion 86 a is inserted into the support hole 101. The large diameter portion 86 b functions as a stopper that contacts the back surface of the upper support plate 100.

  As described above, in the present embodiment, the upper support plate 100 is provided with the support hole 101 that supports the downstream end of each of the plurality of fuel cell units 16 (fuel cell) through the downstream side thereof. The side end portion is formed so as to protrude from the upper support plate 100 through the support hole 101. Further, a gap is formed between the downstream end and the support hole 101 so as to allow relative movement while maintaining the state where the upper support plate 100 supports the plurality of fuel cell units 16 ( (See FIG. 10).

  In this embodiment, the upper support plate 100 that supports the downstream end of each of the plurality of fuel cell units 16 is provided with a support hole 101 that penetrates the downstream end, and the support hole 101 and the downstream end are separated from each other. Since a gap is formed therebetween, relative movement between the upper support plate 100 and the fuel cell unit 16 can be allowed. Further, since the downstream end protrudes from the upper support plate 100 and the downstream end is supported by the upper support plate 100, the gas flowing through the internal flow path of the fuel cell unit 16 is smooth. The flow released to the outside is not obstructed. Accordingly, it is possible to support the fuel gas or oxidant gas discharge passages in the plurality of fuel cell units 16 while ensuring the non-uniform elongation of the plurality of fuel cell units 16. And the fuel cell apparatus which does not inhibit the flow of the gas which flows through an internal flow path can be provided.

  The fuel cell unit 16 includes a fuel cell 84 that is a single cell having a fuel electrode, an air electrode, and an electrolyte layer, and inner electrode terminals 86 as caps provided at both ends of the fuel cell 84 that is a single cell. Have.

  In this way, one of the inner electrode terminals 86 as caps provided at both ends of the fuel cell 84 which is a single cell moves relative to the support hole 101, and a part of the inner electrode terminal 86 as a cap moves to the support hole. Since it slides inside the fuel cell 101, it is possible to suppress damage without applying unnecessary load to the fuel cell 84 which is a single cell.

  The inner electrode terminal 86 as a cap has a small-diameter portion 86a inserted into the support hole 101 and a large-diameter portion fitted into the fuel cell 84 that is a single cell and having an outer diameter larger than the inner diameter of the support hole 101. 86b.

  In this preferred embodiment, the small diameter portion 86a of the inner electrode terminal 86 serving as a cap slides in the support hole 101, so that the plurality of fuel cell units 16 are supported without increasing the size of the upper support plate 100. be able to. In addition, since the large-diameter portion 86b whose outer diameter is larger than the inner diameter of the support hole 101 is provided, the large-diameter portion 86b contacts the upper support plate 100, so that the upper support plate 100 and the fuel cell unit 16 are in contact. The upper support plate 100 can be continuously supported within a preset height range while allowing relative movement between the upper support plate 100 and the upper support plate 100.

  Further, the support hole 101 has a tapered portion whose diameter increases on the side facing the large diameter portion 86b.

  As described above, since the tapered portion is formed in the support hole 101 on the side facing the large-diameter portion 86b, a large gap is formed by the enlarged diameter portion, and the upper support plate 100 and the fuel cell unit 16 are separated from each other. Relative movement is allowed more smoothly.

2: Fuel cell module (fuel cell device)
10: Power generation chamber 12: Fuel cell assembly 14: Fuel cell stack 16: Fuel cell unit (fuel cell)
18: Combustion chamber 20: Reformer 21: Rectifying plate 21a: Opening 22: Heat exchanger 30: Fixed member 31: Welding part 56: Casing 56a: Casing bottom plate 60: Reformed gas supply pipe 62: Water supply pipe 66 : Fuel supply pipe 66a: Lower end side 68: Fuel gas tank (gas manifold)
68a: Fuel gas tank upper plate 68b: Fuel gas tank side plate 70: Combustion gas pipe 72: Power generation air flow path 74: Power generation air introduction pipe 76: Communication flow path 76a: Outlet port 77: Power generation air supply paths 78a, 78b: Air outlet 82: Combustion gas discharge pipe 84: Fuel cell (single cell)
86: Inner electrode terminal 88: Fuel gas channel 90: Inner electrode layer 90a: Upper part 90b: Outer peripheral surface 90c: Upper end surface 92: Outer electrode layer 94: Electrolyte layer 96: Sealing material 98: Fuel gas channel 100: Upper support Plate 102: Current collector 104: External terminal

Claims (4)

A fuel cell device that generates power using fuel gas and oxidant gas,
A plurality of fuel cells each having an internal flow path through which fuel gas or oxidant gas passes and electrically connected to each other;
A gas manifold that supports an upstream end where fuel gas or oxidant gas flows into the plurality of fuel cells and distributes and supplies fuel gas or oxidant gas to each of the fuel cells;
A support plate for supporting a downstream end portion from which the fuel gas or oxidant gas flows out of the plurality of fuel cells, and
The support plate is provided with a support hole for supporting the downstream end of each of the plurality of fuel battery cells through the support plate,
The downstream end is formed so as to penetrate the support hole and protrude from the support plate, and the support plate includes the plurality of fuel cells between the downstream end and the support hole. A fuel cell device characterized in that a gap is formed so as to allow relative movement while maintaining a supported state.   The fuel cell device according to claim 1, wherein the fuel cell includes a single cell having a fuel electrode, an air electrode, and an electrolyte layer, and caps provided at both ends of the single cell.   The said cap has a small diameter part inserted in the said support hole, and a large diameter part which is fitted to the said single cell and whose outer diameter is larger than the internal diameter of the said support hole. Fuel cell device.   4. The fuel cell device according to claim 3, wherein the support hole has a tapered portion whose diameter increases on the side facing the large diameter portion.

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