JP2004039428A - Cell stack and its manufacturing method as well as fuel cell - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a long life cell stack of which manufacturing is easy due to its simple structure and its manufacturing method as well as a fuel cell. <P>SOLUTION: In the cell stack 35 constituted so that one end part of a plurality of fuel cells 33 is inserted into and fixed to a plurality of cell insertion holes 50a1 of a cell support plate 50a, a plurality of fuel cell 33 are established on the cell support plate 50a; the cell insertion hole 50a1 of the cell support plate 50a is formed in a tapering shape, moreover, a concave curved face is formed on at least one part of its inner wall, furthermore, an engaging projection 57 which is larger than the hole diameter of cell installing side of the cell insertion hole 50a1, and which has a convex curved face is formed. The convex curved face of the engaging projection 57 of the fuel cell 33 is joined to the concave curved face of the inner wall face of the cell insertion hole 50a1. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a cell stack in which one end of a plurality of fuel cells is inserted and fixed in a plurality of cell insertion holes of a cell support plate, a method of manufacturing the same, and a fuel cell.
[0002]
[Prior art]
In recent years, as a next-generation energy, various fuel cells in which a plurality of solid oxide fuel cells are housed in a storage container have been proposed. For example, a solid oxide fuel cell has a structure in which a solid electrolyte and a fuel electrode are sequentially formed on the surface of an oxygen electrode, fuel (hydrogen) flows on the fuel electrode, and air flows on the oxygen electrode. (Oxygen) is flowed to generate power at about 600 to 1000 ° C.
[0003]
As described above, since the solid oxide fuel cell uses two types of gases and is exposed to high temperatures, various sealing properties of gas supply pipes and cells are used so that gas does not leak even at high temperatures. Improvements have been made. For example, Japanese Patent Laying-Open No. 8-287940 discloses a structure in which a gas supply pipe is airtightly connected to a gas tank in a storage container, and gas is supplied into the fuel cell by the gas supply pipe. The fuel cell unit is generally supported and fixed to a partition wall arranged in a storage container.
[0004]
[Problems to be solved by the invention]
However, in the fuel cell disclosed in the above-mentioned Japanese Patent Application Laid-Open No. 8-287940, it is necessary to connect the gas supply pipe to the gas tank in a gas-sealed state and to fix the fuel cell itself to the partition. There is a problem that the method of fixing the cells is complicated, the fuel cell itself is complicated, and there are many manufacturing steps.
[0005]
An object of the present invention is to provide a long-life cell stack having a simple structure, easy production, a method for producing the same, and a fuel cell.
[0006]
[Means for Solving the Problems]
The cell stack of the present invention is a cell stack in which one end of each of a plurality of fuel cells is inserted and fixed in each of a plurality of cell insertion holes of a cell support plate, and the plurality of fuel cells are erected on the cell support plate. Forming a cell insertion hole of the cell support plate in a tapered shape toward the cell standing side, and forming a concave curved surface on at least a part of an inner wall surface thereof, and at one end of the fuel cell. Forming an engagement protrusion having a larger diameter than the cell insertion hole on the cell standing side and having a convex curved surface, and forming the convex curved surface of the engagement protrusion of the fuel cell into an inner wall surface of the cell insertion hole. It is formed by joining with a concave curved surface.
[0007]
Such a cell stack is configured such that one end portions of a plurality of fuel cells are inserted and fixed in a plurality of cell insertion holes of a cell support plate, respectively, and the plurality of fuel cells are erected on the cell support plate. A cell support plate in which the cell insertion hole is formed in a tapered shape toward a cell standing side, and at least a part of an inner wall surface of the cell support plate is formed in a concave curved surface; A fuel cell having a larger diameter than the hole on the cell standing side of the insertion hole and having an engaging protrusion having a convex curved surface is prepared, and the other end of the fuel cell is set up in the cell insertion hole. Side, the convex curved surface of the engaging projection is engaged with the concave curved surface of the cell insertion hole, and the cell is joined in this state.
[0008]
That is, for example, the cell support plate is fixed with the larger hole diameter of the cell insertion hole facing up, and inserted into the cell insertion hole of the cell support plate from the other end of the fuel cell, and The convex curved surface of the engaging projection formed at one end of the fuel cell is engaged with the concave curved surface, and the interval between the plurality of fuel cells protruding from the cell support plate is made constant.In this state, for example, the cell The adhesive such as glass interposed between the concave curved surface in the insertion hole and the convex curved surface of the engagement projection can be heated and joined.
[0009]
Therefore, it is possible to obtain a cell stack having a simple structure, and also, after inserting the fuel cells into the plurality of cell insertion holes of the cell support plate, respectively, and by heating, the plurality of fuel cells can be joined and fixed at once. Thus, a cell stack can be easily manufactured.
[0010]
Also, in general, a fuel cell has a solid electrolyte and an outer electrode formed on the outer surface of an inner electrode, an interconnector electrically connected to the inner electrode is exposed to the outside, and the opposing fuel cell has An interconnector of one fuel cell and a current collecting member made of a conductive plate such as Ni felt or a metal plate are arranged between the other outer electrodes, and are electrically connected in series. As described above, since the fuel cells can be fixed in a state where the interval between the plurality of fuel cells protruding from the cell support plate is constant, the thickness of the current collecting member disposed between the fuel cells can be constant. In addition, there is no need to set the thickness of the current collecting member so as to correspond to each distance between the opposed fuel cells. Thereby, the current collecting member made of the conductive plate can be used effectively.
[0011]
Further, the cell stack of the present invention is characterized in that the cell insertion hole on the cell standing side is formed with an inclined surface whose diameter increases toward the cell standing side. In such a cell stack, the fuel cell easily swings around the engaging portion between the concave curved surface in the cell insertion hole and the convex curved surface of the engaging projection of the fuel cell, and a plurality of cells protruding from the cell support plate. It becomes easy to adjust the distance between the fuel cells.
[0012]
Further, in the fuel cell according to the present invention, the cell stack and a gas tank for supplying gas to the plurality of fuel cells are housed in a housing, and the cell support plate of the cell stack is one of the gas tanks. It is characterized by constituting a unit. Such a fuel cell can be easily manufactured with a simple structure, and can be further downsized.
[0013]
BEST MODE FOR CARRYING OUT THE INVENTION
FIG. 1 shows an embodiment of the fuel cell of the present invention, and reference numeral 31 denotes a storage container having a heat insulating structure. Inside the storage container 31, a cell stack 35 in which a plurality of fuel cells 33 are gathered, an oxygen-containing gas supply pipe 39 inserted between the fuel cells 33, and heat provided above the cell stack 35. And an exchange unit 41.
[0014]
The storage container 31 includes a frame 31a made of a heat-resistant metal and a heat insulating material 31b provided on an inner surface of the frame 31a.
[0015]
In the cell stack 35, for example, as shown in FIG. 2, a plurality of fuel cells 33 are arranged in three rows, and electrodes of the outermost fuel cells 33 in two adjacent rows are connected by a conductive member 42. Thus, a plurality of fuel cells 33 arranged in three rows are electrically connected in series. In FIG. 1, a plurality of fuel cells 33 are arranged in four rows.
[0016]
More specifically, as shown in FIG. 2, the fuel cell 33 has a flat shape, and has a plurality of fuel gas passage holes 34 formed therein. The fuel cell 33 has an elliptical cylindrical (flat) porous metal composed mainly of a fuel-side electrode 33a and a dense solid electrolyte 33b and an oxygen-side electrode 33c made of porous conductive ceramics. Are sequentially laminated, and an interconnector 33d is formed on the outer surface of the fuel-side electrode 33a opposite to the oxygen-side electrode 33c. The fuel-side electrode 33a serves as a support.
[0017]
That is, the fuel cell 33 has a cross-sectional shape including an arc-shaped portion A provided at both ends in the width direction and a pair of flat portions B connecting these arc-shaped portions A. It is flat and formed substantially parallel. The pair of flat portions B are formed by forming an interconnector 33d, a solid electrolyte 33b, and an oxygen-side electrode 33c on the flat portion of the fuel-side electrode 33a.
[0018]
A current collecting member 43 made of a metal felt and / or a conductive plate such as a metal plate or a conductive ceramic is interposed between one fuel cell 33 and the other fuel cell 33, and one fuel cell The fuel-side electrode 33a of the cell 33 is electrically connected to the oxygen-side electrode 33c of the other fuel cell 33 via an interconnector 33d provided on the fuel-side electrode 33a and a current collecting member 43, thereby forming a cell stack. 35 are configured.
[0019]
As shown in FIG. 1, the lower ends of the plurality of fuel cells 33 are supported and fixed to a cell support plate 50a constituting a top plate of the fuel gas tank 50, whereby the lower ends of the fuel cells 33 are It is supported and fixed to the gas tank 50 and stands upright. The fuel gas tank 50 is provided with a fuel gas supply pipe 51 for supplying a fuel gas into the fuel cell 33.
[0020]
As shown in FIG. 3, a plurality of cell insertion holes 50a1 into which the lower ends of the fuel cells 33 are inserted and fixed are formed in the cell support plate 50a of the fuel gas tank 50. It is formed in a tapered shape toward the installation side (hereinafter referred to as a cell standing side), and its inner wall surface is a concave curved surface.
[0021]
That is, the inner wall surface of the cell insertion hole 50a1 is formed such that the flat portion B side of the fuel cell 33 is a concave curved surface having an arc-shaped cross section, and the cell insertion hole 50a1 on the cell standing side faces the cell standing side. An inclined surface S whose diameter is increased is formed.
[0022]
On the other hand, at one end of the fuel cell 33, an engagement projection 57 having a convex curved surface larger than the diameter of the cell insertion hole 50 a 1 on the cell standing side is formed. The cell 57 is joined by the glass 59 in a state where the convex curved surface of the portion 57 is engaged with the concave curved surface of the inner wall surface of the cell insertion hole 50a1.
[0023]
Note that the concave curved surface may be formed on a part of the inner wall surface of the cell insertion hole 50a1, and the convex curved surface of the engagement projection 57 of the fuel cell 33 is also formed on a part of the engagement projection 57. It is only necessary that the concave curved surface of the cell insertion hole 50a1 and the convex curved surface of the engagement protrusion 57 engage at least, and the fuel cell 33 can swing to some extent in the direction of the opposed flat portion B. The engagement projection 57 is a semi-cylindrical column, and has a curved surface formed with a hole through which the fuel cell 33 is inserted.
[0024]
Such a cell stack 35 is formed as follows. First, a fuel cell 33 having an engagement protrusion 57 at one end and a cell support plate 50a having a cell insertion hole 50a1 are prepared. As shown in FIG. 4, the inclined surface of the cell insertion hole 50a1 is prepared. The cell support plate 50a is fixed with the side where S is formed downward, that is, with the larger hole diameter of the cell insertion hole 59a1 facing up, and the fuel cell is inserted into the cell insertion hole 50a1 of the cell support plate 50a. 33 is inserted from the other end, that is, the side where the engagement protrusion 57 is not formed, so that the interval between the flat portions B of the plurality of fuel cells 33 projecting from the cell support plate 50a is substantially constant. The fuel cell 33 is adjusted by rocking, and in this state, the glass 59 is used to join the convex curved surface of the engaging projection 57 and the concave curved surface of the cell insertion hole 59a1.
[0025]
Therefore, the plurality of fuel cells 33 can be joined and fixed to the cell support plate 50a at a time, and for example, even if the fuel cells 33 are slightly deformed in the cell manufacturing process, the fuel cells 33 are fixed to the flat portions B thereof. By swinging in the direction, the distance between the flat portions B of the fuel cells 33 can be adjusted to be substantially constant. For example, the current collecting member 43 made of a conductive plate such as a metal plate can be adjusted between the fuel cells 33. Can be easily interposed. Alternatively, after the current collecting member 43 is interposed between the flat portions B of the plurality of fuel cells 33, the convex curved surface of the engaging projection 57 and the concave curved surface of the cell insertion hole 50a1 are joined by the glass 59. The cell stack 35 may be formed.
[0026]
The cell stack 35 constitutes a top plate of the gas tank 50 as shown in FIG. 3, and the cell stack 35 is screwed onto a frame constituting the gas tank 50 so as to seal the cell support plate 50a. Weared or joined.
[0027]
FIG. 5 shows a current collecting member 43 made of a conductive plate such as a metal plate, an alloy plate, or a conductive ceramic interposed between the fuel cells 33. The current collecting member 43 is provided at one end of a rectangular plate. A plurality of slits are formed substantially in parallel with each other, and current collecting pieces 43a between the slits are alternately projected on both sides of the current collecting member 43, and a comb tooth having a plurality of current collecting pieces 43a formed at one end of a base 43b. The plurality of current collecting pieces 43a are in contact with the outer surfaces of the fuel cells 33 facing each other.
[0028]
That is, the current collecting piece 43a is disposed between the interconnector 33d, which is the flat portion of the fuel cell 33 facing the fuel cell, and the oxygen-side electrode 33c, and the fuel cells 33 are connected in series. Since the current collecting piece 43a is in contact with the flat portion B, the current collecting piece 43a is securely in contact with the current collecting piece 43a, and electrical connection can be reliably performed. The plurality of current collecting pieces 43a are joined to the fuel cell 33 with an Ag paste interposed. The Ag paste is baked at the time of power generation, and is joined to the current collecting piece 43a, the interconnector 33d of the fuel cell 33, and the oxygen-side electrode 33c, whereby the electrical connection between the current collecting piece 43a and the fuel cell 33 is sufficiently increased. Can be taken. The width of the current collecting piece 43a is desirably 2 mm or less from the viewpoint of improving current collecting characteristics and sufficiently supplying an oxygen-containing gas between the current collecting pieces 43a.
[0029]
A plurality of these current collecting members 43 are arranged between the opposed fuel cells 33, and are inserted from the base 43b between the opposed fuel cells 33, and the base 43b is located below. These current collecting members 43 are configured by coating the surface of a ferritic stainless steel mainly composed of conductive Cr and Fe with an oxidation resistant substance made of Ag. The current collecting member 43 is not limited to the above-described one as long as it has a conductive metal or alloy as a main component and the surface thereof is coated with an oxidation-resistant substance.
[0030]
A current collecting member 44 shown in FIG. 6 may be interposed between the opposed fuel cells 33. The current collecting member 44 shown in FIG. 6 has a plurality of slits formed substantially parallel to each other, and a current collecting piece 44a formed by alternately protruding current collecting pieces 44a on both sides of the current collecting member 44 to form a long group. The base 44b and the current collecting piece 44a may be alternately formed. With the current collecting member 44 as shown in FIG. 6, the arrangement between the fuel cells can be performed more easily than with the current collecting member 43 of FIG.
[0031]
Further, as shown in FIG. 6C, a plurality of current collecting pieces 46a are formed at predetermined intervals in the length direction, and every other current collecting piece 46a is formed in every other current collecting piece 46a. The fuel cell 33 may be made to protrude and contact the oxygen-side electrode 33c side, and the other flat part may be brought into contact with the interconnector 33d of the other fuel cell 33. In this case, the connection with the interconnector 33d can be sufficiently performed.
[0032]
The tip of the oxygen-containing gas supply pipe 39 is located between the fuel cells 33 as shown in FIG.
[0033]
The heat exchange section 41 includes a heat exchanger 41a and an oxygen-containing gas storage chamber 41b provided to face the cell stack 35.
[0034]
As shown in FIG. 7, the heat exchanger 41a has a plate-fin type structure in which flat plates 61 and corrugated plates 63 are alternately stacked, and a corrugated plate 63a forming a passage communicating with the oxygen-containing gas storage chamber 41b is The corrugated plate 63b formed as shown in FIG. 7B and forming a passage for discharging the combustion gas is formed as shown in FIG. 7C.
[0035]
The combustion gas is introduced from the lower side surface of the heat exchanger 41a and discharged above the heat exchanger 41a as shown by a dashed line in FIG. 1, while the oxygen-containing gas is discharged by a pipe 73 through a dashed line in FIG. As shown, it is introduced from the upper side surface of the heat exchanger 41a, is guided below the heat exchanger 41a, and is introduced into the oxygen-containing gas storage chamber 41b.
[0036]
As shown in FIG. 8, the oxygen-containing gas storage chamber 41b is provided on the end face of the heat exchanger 41a on the side where the oxygen-containing gas is introduced, that is, on the cell stack side end face, and passes through each passage of the corrugated plate 63a. The oxygen-containing gas is stored once.
[0037]
A plurality of oxygen-containing gas supply pipes 39 communicate with the oxygen-containing gas storage chamber 41b.
[0038]
Further, as shown in FIG. 1, between the side surface of the oxygen-containing gas storage chamber 41b and the heat insulating material 31b, that is, around the oxygen-containing gas storage chamber 41b, the combustion gas is introduced to introduce the combustion gas into the heat exchanger 41a. The mouth 71 is provided. The combustion gas is led out to the passage of the corrugated plate 63b of the heat exchanger 41a through the combustion gas inlet 71.
[0039]
In the fuel cell configured as described above, an oxygen-containing gas (for example, air) from the outside is introduced into the heat exchanger 41a via the pipe 73, introduced into the oxygen-containing gas storage chamber 41b, and the oxygen-containing gas supply pipe 39 is connected. Fuel gas (for example, hydrogen) is supplied into the fuel gas passage hole 34 of the fuel cell 33 via the fuel gas supply pipe 51 and the gas tank 50, and the fuel cell 33 is discharged. To generate electricity.
[0040]
Excess fuel gas not used for power generation blows out from the upper end of the fuel gas passage hole 34, and excess oxygen-containing gas not used for power generation blows upward through the space between the fuel cells 33, and surplus fuel The gas and the excess oxygen-containing gas are reacted and burned to generate combustion gas, which is led to the heat exchanger 41a through the combustion gas inlet 71 and discharged from the upper end of the heat exchanger 41a. .
[0041]
In the fuel cell of the present invention, the cell stack 35 can be manufactured by joining and fixing a plurality of fuel cells 33 to the cell support plate 50a at a time. For example, a current collecting member made of a conductive plate such as a metal plate 43 can be easily interposed between the fuel cells 33, and the cell stack 35 can be easily manufactured with a simple structure, whereby the fuel cell can be easily manufactured with a simple structure. Further, since the distance between the fuel cells can be freely controlled, electrical connection with the current collecting member 43 can be reliably ensured, and a long-life fuel cell can be obtained.
[0042]
In addition, excess fuel gas and oxygen-containing gas that have not contributed to power generation react and burn, and this combustion gas and an external oxygen-containing gas are introduced into the heat exchanger 41a, where the heat gas and the oxygen-containing gas are combined. Since heat can be exchanged with the oxygen-containing gas and the oxygen-containing gas can be preheated, the startup time until the fuel cell 33 is heated to substantially generate power can be greatly reduced.
[0043]
Further, in the present invention, since the oxygen-containing gas storage chamber 41b and the heat exchanger 41a are formed adjacently above the cell stack 35, the burned high-temperature combustion gas can be transferred to the heat exchanger 41a without using piping or the like. And the preheating efficiency of the oxygen-containing gas can be increased with a simple structure.
[0044]
Further, since the combustion gas and the oxygen-containing gas can be heat-exchanged in the storage container 31, there is no need to separately provide a burner for preheating the oxygen-containing gas, and the size can be reduced, and the combustion gas can be effectively used.
[0045]
Further, since the oxygen-containing gas storage chamber 41b is provided in the heat exchanger 41a, the connection between the heat exchanger 41a and the oxygen-containing gas supply pipe 39 can be performed through the oxygen-containing gas storage chamber 41b. The oxygen-containing gas from 41a can be reliably supplied between the fuel cells 33.
[0046]
Note that the present invention is not limited to the above-described embodiment, and various changes can be made without changing the gist of the present invention. For example, in the above-described embodiment, the example in which the cell stack 35 is configured using the fuel cell 33 having an elliptical column shape and a plurality of fuel gas passage holes 34 as illustrated in FIG. 2 has been described, but the fuel cell has a cylindrical shape. The fuel gas passage hole may be one, and the shape of the fuel cell is not particularly limited.
[0047]
FIG. 9 illustrates a case in which a cylindrical fuel cell 93 is joined to a cell support plate 95. One end of the fuel cell 93 is provided with a spherical engaging projection 97, The convex curved surface of the engaging projection 97 of the fuel cell 93 is engaged with and joined to the concave curved surface of the cell insertion hole 95a1 of the fuel cell 93. The engagement projection 97 has a structure in which a through hole through which the fuel cell 93 is inserted is formed in a sphere. Even with such a cell stack, the same effect as described above can be obtained.
[0048]
FIG. 10 shows a structure in which the cell support plate 103 of the cell stack 101 of the present invention is joined to a fuel gas tank 105. The cell stack 101 has an engagement projection 109 formed at one end of a fuel cell 107. A part of the convex curved surface of the engaging projection 109 is engaged with the concave curved surface of the cell insertion hole 111 of the cell support plate 103, and is joined by the glass 113.
[0049]
The engaging protrusion 109 has a structure in which a hole through which the fuel cell is inserted is formed on the side surface of the cylindrical body, and a gap is formed between one end of the fuel cell 107 and the top plate of the fuel gas tank 105. In the top plate of the fuel gas tank 105, a through hole 119 for supplying fuel gas to the gas passage hole 117 of the fuel cell 107 is formed.
[0050]
Since such a cell stack 101 is joined on the gas tank 105, it has substantially the same operation and effect as the cell stack of FIG.
[0051]
Further, although the plate fin type is used as the heat exchanger 41a, the present invention is not limited to this, and it goes without saying that other heat exchangers may be used.
[0052]
【The invention's effect】
In the cell stack of the present invention, the cell support plate is fixed with the larger diameter of the cell insertion hole facing upward, and a plurality of fuel cells are inserted into the cell insertion hole of the cell support plate from the other end. The convex curved surface of the engaging projection formed at one end of the fuel cell is engaged with the concave curved surface in the cell insertion hole, and the interval between the plurality of fuel cells protruding from the cell support plate is made constant. In this state, for example, a bonding material such as glass interposed between the concave curved surface in the cell insertion hole and the convex curved surface of the engagement protrusion can be heated and bonded, thereby obtaining a cell stack having a simple structure. After the fuel cells are inserted into the plurality of cell insertion holes of the cell support plate, respectively, the plurality of fuel cells can be joined and fixed at once by heating, and a cell stack can be easily manufactured.
[0053]
Further, since the distance between the fuel cells is adjusted, even when a current collecting member made of a conductive plate is interposed, the electrical connection between the fuel cells can be reliably maintained for a long time. .
[Brief description of the drawings]
FIG. 1 is an explanatory view showing a fuel cell of the present invention.
FIG. 2 is a cross-sectional view showing the cell stack of FIG.
FIG. 3 is a partially cutaway perspective view showing a state in which a top plate of a fuel gas tank is used as a cell support plate and fuel cells are erected on the fuel gas tank.
FIG. 4 is a partially cutaway perspective view for explaining a method of manufacturing the cell stack of the present invention.
5A and 5B show a state in which fuel cells are connected by using a comb-shaped current collecting member having a plurality of current collecting pieces formed at one end of a base; FIG. 5A is a side view, and FIG. () Is a perspective view showing a current collecting member.
FIG. 6 shows a state in which fuel cells are connected by using a current collecting member formed by forming a plurality of current collecting piece groups at predetermined intervals in the length direction, and FIG. (B) is a perspective view showing a current collecting member, and (c) is a perspective view showing a current collecting member in which a current collecting piece protrudes only on one side.
FIGS. 7A and 7B are views for explaining the concept of the heat exchanger of FIG. 1, wherein FIG. 7A is a perspective view of the heat exchanger, and FIG. 7B shows a corrugated sheet for forming a passage for an oxygen-containing gas. FIG. 3C is a perspective view showing a corrugated plate for forming a passage of a combustion gas.
FIG. 8 is a perspective view for explaining a heat exchange unit of the present invention.
FIG. 9 is a partially cutaway perspective view showing a state in which a cylindrical fuel cell unit is joined to a cell support plate.
FIG. 10 is a partially cutaway perspective view showing a state in which a cell stack is erected on the upper surface of a fuel gas tank.
[Explanation of symbols]
31 ... storage containers 33, 93, 107 ... fuel cell 33a ... fuel side electrode (inside electrode)
33b: solid electrolyte 33c: oxygen side electrode (outer electrode)
50, 105 ... fuel gas tanks 35, 101 ... cell stacks 50a, 95, 103 ... cell support plates 50a1, 111 ... cell insertion holes 57, 97, 109 ... engagement protrusions S ..Slope of cell insertion hole

Claims (4)

A cell stack in which one end of each of the plurality of fuel cells is inserted and fixed in each of a plurality of cell insertion holes of a cell support plate, and the plurality of fuel cells are erected on the cell support plate. A cell insertion hole of the plate is formed in a tapered shape toward the cell standing side, and a concave curved surface is formed on at least a part of the inner wall surface, and a cell of the cell insertion hole is formed at one end of the fuel cell. An engaging projection having a diameter larger than the hole on the standing side and having a convex curved surface was formed, and the convex curved surface of the engaging projecting portion of the fuel cell was engaged with the concave curved surface of the inner wall surface of the cell insertion hole. A cell stack characterized by being joined in a state. 2. The cell stack according to claim 1, wherein the cell insertion hole on the cell standing side is formed with an inclined surface whose diameter increases toward the cell standing side. A method of manufacturing a cell stack, wherein one end of each of a plurality of fuel cells is inserted and fixed in a plurality of cell insertion holes of a cell support plate, and the plurality of fuel cells are erected on the cell support plate. A cell support plate in which a cell insertion hole is formed in a tapered shape toward the cell standing side, and at least a part of the inner wall surface is formed in a concave curved surface, and at one end, a cell standing side of the cell insertion hole. Prepare a fuel cell in which an engagement protrusion having a larger diameter than the hole diameter and a convex curved surface is formed, and insert the other end of the fuel cell into the cell insertion hole toward the cell standing side, A method of manufacturing a cell stack, wherein a convex curved surface of the engaging projection is engaged with a concave curved surface of the cell insertion hole, and the cells are joined in this state. The cell stack according to claim 1 or 2, and a gas tank for supplying gas to the plurality of fuel cells are housed in a housing, and a cell support plate of the cell stack forms a part of the gas tank. A fuel cell, comprising:

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