JP2018139196A - Cell stack device, module and module housing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cell stack device, a module and a module housing device with improved reliability.SOLUTION: A cell stack device 1 includes a columnar cell 3 having a gas flow path 14, a manifold 7 having an internal space 72 through which reaction gas supplied to the cell 3 flows, and an opening 71, and a sealant 16 for bonding one end of the cell 3 to the manifold 7 inserted into the opening 71, so that the internal space 72 of the manifold 7 and the gas flow path 14 of the cell 3 are interconnected. In the cross-sectional view in the vertical direction, the manifold 7 has a cell facing part 7a1 facing the cell 3 via the sealant 16, and a space facing part 7a2 continuous to the cell facing part 7a1, and facing the internal space 72 of the manifold 7 or the outer space 73 via the sealant 16, and includes a protrusion 7a3 in at least one of the cell facing part 7a1 and the space facing part 7a2.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a cell stack device, a module, and a module housing device.

  2. Description of the Related Art In recent years, a cell stack device in which a plurality of fuel battery cells, which are cells capable of obtaining electric power using a fuel gas (hydrogen-containing gas) and an oxygen-containing gas (air), are arranged as next-generation energy is known. ing. Various modules have been proposed in which a cell stack device is stored in a storage container and a module storage device in which a module is stored in an outer case (see, for example, Patent Document 1).

  Such a cell stack device is configured by fixing one end of a fuel cell to a manifold with a sealing material. (For example, see Patent Document 2.)

JP 2007-59377 A JP 2015-35417 A

  In the cell stack apparatus as described above, since the thermal expansion coefficient is different between the sealing material and the manifold, there is a possibility that cracks may occur at the interface between the sealing material and the manifold due to the tensile stress caused by the volume change due to temperature rise and fall. .

  Therefore, an object of the present invention is to provide a cell stack device, a module, and a module housing device that suppress the occurrence of cracks and have improved reliability.

  The cell stack device of the present invention includes a columnar cell having a gas flow path, an internal space in which a reaction gas supplied to the cell flows, an opening, a manifold having the opening, an internal space of the manifold, and the cell. A sealing material that joins one end of the cell inserted into the opening to the manifold so as to communicate with a gas flow path, and the manifold includes the sealing material in a cross-sectional view in a vertical direction. A cell facing portion that faces the cell via, and a space facing portion that continues to the cell facing portion and faces the internal space or the external space of the manifold via the sealing material, and the cell facing portion and A convex part is included in at least one of the space facing parts.

  The module of the present invention is characterized in that the cell stack device is stored in a storage container.

  The module housing apparatus of the present invention is characterized in that the above-mentioned module and an auxiliary machine for operating the module are housed in an outer case.

  The cell stack device of the present invention can be a cell stack device with improved reliability.

  The module of the present invention can be a module with improved reliability.

  Furthermore, the module housing apparatus of the present invention can be a module housing apparatus with improved reliability.

The cell stack apparatus of this embodiment is shown, (a) is the longitudinal cross-sectional view which shows a cell stack apparatus roughly, (b) is a cross-sectional view which expands and shows a part of (a). It is sectional drawing which expands and shows the site | part of the broken line A of the cell stack apparatus shown in FIG. It is sectional drawing in other embodiment which expands and shows the site | part of the broken line A of the cell stack apparatus shown in FIG. It is sectional drawing which expands and shows the site | part of the broken line B of the cell stack apparatus shown in FIG. It is an external appearance perspective view which shows the module provided with an example of the cell stack apparatus of this embodiment. It is a disassembled perspective view which shows roughly an example of the module accommodating apparatus of this embodiment. (A) is a top view of the supporting member which shows the other example of this embodiment, (b) is an expanded sectional view by the side of the cell stack apparatus provided with the supporting member shown to (a). It is sectional drawing which expands and shows the site | part of the broken line C of the cell stack apparatus shown in FIG.

  Hereinafter, the cell stack device of this embodiment will be described with reference to the drawings. 1A and 1B show a cell stack device according to the present embodiment, in which FIG. 1A is a longitudinal sectional view schematically showing the cell stack device, and FIG. 1B is a transverse sectional view showing a part of FIG. . In the following drawings, the same components are described using the same reference numerals.

  The cell stack device shown in FIG. 1 is a fuel cell stack device in which a plurality of fuel cells that are cells are arranged. In the following description, a fuel cell is described as an example.

  A cell stack device 1 shown in FIG. 1 has a cell stack 2 including a plurality of columnar fuel cells 3. The fuel cell 3 may be a solid oxide fuel cell. The fuel battery cell 3 has a gas flow path 14 therein, and a cross section having a pair of opposing flat surfaces is flat and has an inner electrode layer on one flat surface of the columnar conductive support 13 as a whole. The fuel electrode layer 9, the solid electrolyte layer 10, and the air electrode layer 11 as the outer electrode layer are sequentially laminated. In the fuel cell 3, the interconnector 12 is laminated on a portion of the other flat surface where the air electrode layer 11 is not formed. And the fuel cell 3 is electrically connected in series by arrange | positioning via the electrically-conductive member 4 between the adjacent fuel cells 3. Note that a conductive bonding material 15 is provided on the outer surface of the interconnector 12 and the outer surface of the air electrode layer 11, and the conductive member 4 is connected to the air electrode layer 11 and the interconnector 12 via the bonding material 15. By doing so, the contact between them becomes an ohmic contact, the potential drop is reduced, and the deterioration of the conductive performance can be effectively suppressed.

  And the lower end of each fuel cell 3 which comprises the cell stack 2 is being fixed to the manifold 7 for supplying the reaction gas to the fuel cell 3 with the sealing materials 16, such as glass. The sealing material 16 will be described later. Further, in the cell stack device 1 shown in FIG. 1, an example in which a hydrogen-containing gas (fuel gas) is supplied as a reaction gas from the manifold 7 to the gas flow path 14 is shown. Is connected to a fuel gas supply pipe 8.

In addition, the elastically deformable end portion that sandwiches the cell stack 2 from both ends in the arrangement direction of the fuel cells 3 (X direction shown in FIG. 1) via the conductive member 4, and the lower end is fixed to the manifold 7. A conductive member 5 is provided. Here, in the end conductive member 5 shown in FIG. 1, current generated by power generation of the cell stack 2 (fuel cell 3) having a shape extending outward along the arrangement direction of the fuel cells 3 is externally applied. A current drawing portion 6 for drawing out is provided.

  By the way, in the cell stack device 1, the temperature of the fuel cell 3 is controlled by combusting the fuel gas (excess fuel gas) discharged from the gas flow path 14 on the upper end side of the fuel cell 3. Can be raised. Thereby, the start-up of the cell stack apparatus 1 can be accelerated.

  The manifold 7 includes a gas case 7 b and a support member 7 a that is disposed on the gas case 7 b and includes an opening 71. The lower end portion of the fuel cell 3 is surrounded by a support member 7a, and the lower end portion of the fuel cell 3 is fixed by a sealing material 16 filled inside the support member 7a. The gas case 7 b has an opening 71 for supplying fuel gas to the gas flow path 14 of the fuel cell 3 on the upper surface. The opening 71 of the support member 7a and the gas case 7b is closed by the fuel cell 3 and the sealing material 16, and the reaction gas flows into the internal space 72 thereof. That is, the sealing material 14 is formed by joining one end of the fuel cell 3 inserted into the opening 71 to the manifold 7 so that the internal space 72 of the manifold 7 and the gas flow path 14 of the fuel cell 3 communicate with each other. Yes. Thereby, parts other than the gas flow path 14 of the fuel battery cell 3 are airtightly sealed. The manifold 7 is a metal and may be made of a material containing iron and chromium such as stainless steel, for example. An oxygen-containing gas flows in the external space 73 of the manifold 7.

The sealing material 16 is preferably a material having insulating properties and heat resistance of 800 to 1000 ° C., for example, glass (especially amorphous glass or glass containing crystal) is used. be able to. Specifically, a SiO ₂ —MgO—B ₂ O ₃ —Al ₂ O ₃ —CaO system or a SiO ₂ —MgO—B ₂ O ₅ —ZnO system can be used.

  Below, each member which comprises the fuel cell 3 shown in FIG. 1 is demonstrated.

As the fuel electrode layer 9, generally known ones can be used. For example, porous conductive ceramics such as ZrO ₂ in which a rare earth element oxide is dissolved (referred to as stabilized zirconia, partially stable). And Ni and / or NiO can be used.

The solid electrolyte layer 10 has a function as an electrolyte for bridging electrons between electrodes, and at the same time has a gas barrier property to prevent leakage between the fuel gas and the oxygen-containing gas. 3 to 15 mol% of rare earth element oxide is formed from ZrO ₂ as a solid solution. In addition, as long as it has the said characteristic, you may use another material.

The air electrode layer 11 is not particularly limited as long as it is generally used. For example, a conductive ceramic made of a so-called ABO ₃ type perovskite oxide can be used. The air electrode layer 11 has gas permeability, and for example, the open porosity is preferably 20% or more, particularly preferably in the range of 30 to 50%.

The interconnector 12 can be made of conductive ceramics. Since the interconnector 12 is in contact with a fuel gas (hydrogen-containing gas) and an oxygen-containing gas (air or the like), the interconnector 12 needs to have reduction resistance and oxidation resistance. Therefore, the lanthanum chromite perovskite oxide (LaCrO ₃ oxide) is preferably used. The interconnector 12 is dense in order to prevent leakage of fuel gas flowing through the plurality of gas flow paths 14 formed in the conductive support 13 and oxygen-containing gas flowing outside the conductive support 13. For example, it is preferable to have a relative density of 93% or more, particularly 95% or more.

The conductive support 13 is gas permeable in order to allow the fuel gas to permeate to the fuel electrode layer 9, and is conductive in order to collect current via the interconnector 12. Therefore, for example, conductive ceramics or cermet can be used as the conductive support 13. In producing the fuel cell 3, when producing the conductive support 13 by co-firing with the fuel electrode layer 9 or the solid electrolyte layer 10, an iron group metal component and a specific rare earth oxide (Y ₂ O ₃ , The conductive support 13 is preferably formed from Yb ₂ O ₃ or the like. The conductive support 13 preferably has an open porosity of 30% or more, particularly 35 to 50% in order to provide gas permeability, and the conductivity is 300 S / cm or more, In particular, it is preferably 440 S / cm or more.

  Although not shown, an intermediate layer may be provided. As a result, the solid electrolyte layer 10 and the air electrode layer 11 are firmly joined, and the solid electrolyte layer 10 component and the air electrode layer 11 component are interposed between the solid electrolyte layer 10 and the air electrode layer 11. It can suppress that the reaction layer with high electrical resistance is formed by reaction.

Here, the intermediate layer may have a composition containing Ce (cerium) and other rare earth elements, for example,
(1): (CeO ₂ ) _1-x (REO _1.5 ) _x
In the formula, RE is at least one of Sm, Y, Yb, and Gd, and x is a number that satisfies 0 <x ≦ 0.3.
It is preferable to have the composition represented by these. Furthermore, from the viewpoint of reducing electrical resistance, it is preferable to use Sm or Gd as RE, for example, it is preferably made of CeO ₂ in which 10 to 20 mol% of SmO _1.5 or GdO _1.5 is dissolved. .

  Also, the intermediate layer can be made into two layers. As a result, the solid electrolyte layer 10 and the air electrode layer 11 are firmly bonded, and the components of the solid electrolyte layer 10 and the components of the air electrode layer 11 react to form a reaction layer with high electrical resistance. Further suppression can be achieved.

  Although not shown, an adhesion layer can be provided between the interconnector 12 and the conductive support 13. Thereby, the difference in thermal expansion coefficient between the interconnector 12 and the conductive support 13 can be reduced.

The adhesion layer can have a composition similar to that of the fuel electrode layer 9, for example, ZrO ₂ (referred to as stabilized zirconia) in which a rare earth element oxide such as YSZ is dissolved, Ni and / or NiO can do. In addition, it is preferable that ZrO _{2 in} which the rare earth element oxide is dissolved and Ni and / or NiO have a volume ratio of 40:60 to 60:40.

  FIG. 2 is an enlarged cross-sectional view of a portion indicated by a broken line A shown in FIG.

  In the embodiment of FIG. 2, as described above, the lower end portion of the fuel battery cell 3 is surrounded by the support member 7a, and the lower end portion of the fuel battery cell 3 is sealed by the sealing material 16 filled inside the support member 7a. It is fixed. The sealing material 16 has a concave meniscus surface exposed to the gas flowing outside the manifold 7 in a cross-sectional view in the vertical direction.

By the way, since the material is different between the manifold 7 and the sealing material 16, the coefficients of thermal expansion are different. For this reason, the stress caused by the volume change due to the temperature rise and fall is concentrated near the interface between the manifold 7 and the sealing material 16. In particular, when a tensile stress is applied at the interface between the sealing material 16 and the manifold 7, there is a possibility that a crack due to peeling may occur.

  Therefore, in the cell stack device 1 in the embodiment of FIG. 2, the manifold 7 is continuous with the cell facing portion 7a1 and the cell facing portion 7a1 facing the fuel cell 3 via the sealing material 16 in a cross-sectional view in the vertical direction. And a space facing portion 7a2 that faces the internal space 72 or the external space 73 of the manifold 7 via the sealing material 16, and includes a convex portion 7a3 in at least one of the cell facing portion 7a1 and the space facing portion 7a2. .

  With this configuration, since the joint strength between the manifold 7 and the sealing material 16 can be improved, it is possible to suppress the occurrence of cracks due to peeling at the interface between the manifold 7 and the sealing material 16. Therefore, the cell stack device 1 with improved reliability can be obtained.

  In addition, when the normal line of the surface of the support member 7a in the manifold 7 overlaps with the sealing material 16 and the fuel cell 3 in this order in the cross-sectional view in the vertical direction, the surface is assumed to be the cell facing portion 7a1. Further, when the normal line of the surface of the support member 7a in the manifold 7 overlaps with the sealing material 16 and the internal space 72 or the external space 73 of the manifold 7 in this order in the cross-sectional view in the vertical direction, the surface is the space facing portion 7a2. Suppose that

  The convex portion 7 a 3 is a portion protruding in at least one of the internal space 72 or the external space 73 of the manifold 7 and the fuel cell 3. Further, the cell facing portion and the space facing portion other than the convex portion 7a3 are referred to as flat portions. The height H of the convex portion 7a3 may be 0.5 μm or more, but is preferably 1 μm or more. The width W of the convex portion 7a3 may be 0.5 μm or more, but is preferably 1 μm or more.

  2 protrudes in both directions of the inner space 72 of the manifold 7 and the fuel cell 3. In this case, the width W of the convex portion 7a3 refers to the length of a straight line connecting the bottom points on both sides of the convex shape of the convex portion, and the height H of the convex portion 7a3 refers to the width W direction of the convex portion 7a3. The length in the direction orthogonal to

  The convex portion 7a3 only needs to be provided in either the cell facing portion 7a1 or the space facing portion 7a2. However, like the cell stack device 1 in the embodiment of FIG. 2, the manifold 7 has the cell facing portion 7a1. And a convex portion 7a3 may be provided at the corner between the space facing portion 7a2. With this configuration, it is possible to suppress the stress from concentrating on the continuous portion that is a corner portion and generating cracks.

  The material of the convex portion 7a3 may be the same as that of the manifold 7, or a different heat resistant material may be used.

  FIG. 3 is a cross-sectional view in another embodiment showing an enlarged view of a broken line A portion of the cell stack apparatus 1 shown in FIG. FIG. 4 is an enlarged cross-sectional view of a portion indicated by a two-dot chain line B of the cell stack device 1 shown in FIG.

  The convex portion 7 a 3 of the cell stack device 1 in the embodiment of FIGS. 3 and 4 protrudes only toward the internal space 72 of the manifold 7. In this case, the width W of the convex portion 7a3 refers to the length in the direction in which the flat portion of the space facing portion 7a2 extends, and the height H of the convex portion 7a3 refers to the length in the normal direction of the flat portion of the space facing portion 7a2. Say it. Also with this configuration, the occurrence of cracks due to peeling at the interface between the manifold 7 and the sealing material can be suppressed. In addition, the convex part 7a3 may protrude only toward the fuel battery cell 3.

  The cell stack device 1 in the embodiment of FIGS. 3 and 4 is an angle formed by the surface extension line S1 in the cell facing portion 7a1 excluding the convex portion 7a3 and the surface extension line S2 in the space facing portion 7a2 excluding the convex portion 7a3. Y is an obtuse angle. With this configuration, it is possible to alleviate stress concentration on the corners or the convex portions 7a3 provided at the corners. The surface extension line S includes surface lines.

  Here, the manufacturing method of the cell stack apparatus 1 will be described below. First, the convex part 7a3 is provided in the part joined to the sealing material 16 among the supporting members 7a, in other words, the part that becomes the cell facing part 7a1 or the space facing part 7a2. For example, the support member 7a having the convex portion 7a3 can be manufactured by using a mold in which a concave portion corresponding to the convex portion 7a3 is provided in advance. Next, the support member 7a is placed on the heat insulating plate-like body. Next, the lower end of the fuel cell 3 is inserted into the support member 7a and placed on the plate-like body. Next, a paste formed by adding an organic component to the Si-based crystallized glass powder is poured into the opening of the support member 7a and heat-treated at 850 ° C. for 5 hours, and the lower end of the fuel cell 3 and the support member 7a sealing material 16 are subjected to heat treatment. Secure with. Next, the plate-like body is pulled away from the support member 7a or the lid-like member. Finally, the support member 7a to which the cell stack 2 is fixed is fixed to the gas tank 7a with a sealing material so as to close the opening on the upper surface of the gas tank 7b.

  In the cell stack device 1 in the embodiment of FIGS. 3 and 4, the space facing portion 7a2 on the inner space 72 side excluding the convex portion 7a3 is inclined so that the fuel cell 3 side becomes higher. According to this configuration, in the step of pouring the sealing material 16 into the support member 7a placed on the plate-like body in the manufacturing method described above, the lower surface of the support member 7a that can be the space facing portion 7a2 on the internal space 72 side, The gap with the plate-like body becomes narrower toward the outer periphery of the support member 7a. Accordingly, in the above-described manufacturing method, the sealing material 16 can be sufficiently filled in the gap between the lower surface of the supporting member 7a on the inner space 72 side and the plate-like body, so that the sealing material 16 and the supporting member 7a are firmly formed. Can be fixed.

  FIG. 5 is an external perspective view showing an example of a module including the cell stack device 1 of the present embodiment.

  In the module 20 shown in FIG. 5, the cell stack device 1 of the present embodiment is stored in the storage container 21. A reformer 22 for generating fuel gas to be supplied to the fuel cell 3 is disposed above the cell stack device 1. 5 shows the case where the cell stack apparatus 1 includes two cell stacks 2. However, the number of the cell stack apparatuses 1 can be changed as appropriate. For example, even if only one cell stack 2 is provided. Good. Further, the cell stack apparatus 1 may include the reformer 22.

  Further, in FIG. 5, the fuel cell 3 is a hollow plate type having a plurality of fuel gas passages through which fuel gas flows in the longitudinal direction, and a fuel electrode layer is formed on the surface of the support having the fuel gas passages. 1 illustrates a solid oxide fuel cell 3 in which a solid electrolyte layer and an oxygen electrode layer are sequentially laminated. An oxygen-containing gas flows between the fuel cells 3.

  Further, in the reformer 22 shown in FIG. 5, fuel gas is generated by reforming raw fuel such as natural gas or kerosene supplied through the raw fuel supply pipe 26. The reformer 22 preferably has a structure capable of performing steam reforming, which is an efficient reforming reaction. The reformer 22 reforms the raw fuel into fuel gas, and a vaporizer 23 for vaporizing water. And a reforming section 24 in which a reforming catalyst (not shown) is disposed. The fuel gas generated by the reformer 22 is supplied to the manifold 7 through a fuel gas distribution pipe 25 (corresponding to the fuel gas supply pipe 8 shown in FIG. 1), and the interior of the fuel cell 3 is supplied from the manifold 7. Is supplied to the fuel gas flow path provided in the.

  Further, FIG. 5 shows a state in which a part (front and rear surfaces) of the storage container 21 is removed and the cell stack device 1 stored inside is taken out rearward. Here, in the module 20 shown in FIG. 5, the cell stack device 1 can be slid and stored in the storage container 21.

  Note that, inside the storage container 21, oxygen is disposed between the cell stacks 2 juxtaposed on the manifold 7, so that the oxygen-containing gas flows from the lower end portion toward the upper end portion of the fuel cell 3. A contained gas introduction member 27 is disposed.

  FIG. 6 is an exploded perspective view showing an example of the module housing device of the present embodiment in which the module 20 shown in FIG. 5 and an auxiliary machine (not shown) for operating the module 20 are housed in the outer case. FIG. In FIG. 6, a part of the configuration is omitted.

  The module housing device 41 shown in FIG. 6 divides the inside of the exterior case composed of the columns 42 and the exterior plate 43 vertically by the partition plate 44, and the upper side thereof serves as the module storage chamber 45 that houses the module 20 described above. The lower side is configured as an auxiliary equipment storage chamber 46 for storing auxiliary equipment for operating the module 20. In addition, the auxiliary machine stored in the auxiliary machine storage chamber 46 is omitted.

  In addition, the partition plate 44 is provided with an air circulation port 47 for allowing the air in the auxiliary machine storage chamber 46 to flow toward the module storage chamber 45, and a part of the exterior plate 43 constituting the module storage chamber 45 includes An exhaust port 48 for exhausting air in the module storage chamber 45 is provided.

  In such a module storage device 41, as described above, the module 20 with improved long-term reliability is stored in the module storage chamber 45, and an auxiliary machine for operating the module 20 is stored in the auxiliary device storage chamber 46. Thus, the module accommodating device 41 with improved long-term reliability can be obtained.

  FIG. 7A is a plan view showing another example of the present embodiment, and FIG. 7B is an enlarged cross-sectional view of the side surface side of the cell stack device 1A provided with the support shown in FIG.

  As shown in FIG. 2, one end of each fuel cell 3 in one row is inserted into the opening 71 formed in only one support member 7a, but like the cell stack device 1A shown in FIG. One fuel cell 3 may be inserted into each of the plurality of openings 71 formed in the support member 7a.

  FIG. 8 is an enlarged cross-sectional view of a portion indicated by a broken line C of the cell stack device 1 shown in FIG.

  As shown in FIG. 8, the space facing portion 7 a 2 is provided on both the internal space side 72 and the external space 73 side. In addition, as shown in FIG. 8, the convex portion 7a3 includes corners between the cell facing portion 7a1 and the space facing portion 7a2 on the inner space 72 side, and corners between the cell facing portion 7a1 and the space facing portion 7a2 on the outer space 73 side. Although it may be provided in any of the parts, only one of them may be provided.

  Although the present invention has been described in detail above, the present invention is not limited to the above-described embodiments, and various modifications and improvements can be made without departing from the scope of the present invention.

For example, a fuel battery cell in which an air electrode layer, a solid electrolyte layer, and a fuel electrode layer are disposed on a conductive support may be used. Further, for example, in the above embodiment, the fuel electrode layer 9, the solid electrolyte layer 10, and the air electrode layer 11 are laminated on the conductive support 13, but the fuel electrode layer 9 itself is not used without using the conductive support 13. A solid electrolyte layer 10 and an air electrode layer 11 may be provided on the fuel electrode layer 9 as a support.

  Further, the present invention can be applied to a horizontally-striped bundle formed by combining a plurality of so-called horizontally-striped fuel cell stacks in which a plurality of power generation element portions each having an air electrode layer, a solid electrolyte layer, and a fuel electrode layer are formed on a support. it can.

Furthermore, although the fuel cell 3, the cell stack device 1, the module 20, and the module housing device 41 have been described in the above embodiment, hydrogen and water are obtained by electrolyzing water vapor (water) by applying water vapor and voltage to the cell. The present invention can also be applied to an electrolysis cell (SOEC) that generates oxygen (O ₂ ), an electrolysis cell stack device including the electrolysis cell, an electrolysis module, and an electrolysis device that is a module housing device.

1: Cell stack device 3: Fuel cell 7: Manifold 7a: Support member 7a1: Cell facing portion 7a2: Space facing portion 7a3: Protruding portion 71: Opening 72: Internal space 16: Sealing material 20: Module 41: Module accommodation apparatus

Claims (6)

A columnar cell having a gas flow path;
An internal space through which a reaction gas supplied to the cell flows, and an opening,
A manifold having
A sealing material that joins one end of the cell inserted into the opening to the manifold so that the internal space of the manifold communicates with the gas flow path of the cell;
In cross-sectional view in the vertical direction,
The manifold is
A cell facing part facing the cell via the sealing material;
A space facing portion that is continuous with the cell facing portion and faces the internal space or the external space of the manifold via the sealing material;
A cell stack device comprising a convex portion in at least one of the cell facing portion and the space facing portion.   The cell stack device according to claim 1, wherein the manifold is provided with the convex portion at a corner portion between the cell facing portion and the space facing portion.   3. The cell according to claim 1, wherein an angle formed by a surface extension line in the space facing portion excluding the convex portion and a surface extension line in the cell facing portion excluding the convex portion is an obtuse angle. Stack device.   4. The cell stack device according to claim 1, wherein the space facing portion excluding the convex portion is inclined so that the cell side becomes higher. 5.   A module comprising the cell stack device according to any one of claims 1 to 4 stored in a storage container.   6. A module housing device, wherein the module according to claim 5 and an auxiliary machine for operating the module are housed in an outer case.

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