JP2005317291A - Supporting film type solid oxide fuel cell stack, and manufacturing method of the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a supporting film type SOFC stack capable solving the problem of minor warping, distortion, and variations of the thickness of cells, and the problem of accumulation of displacement caused by increasing the number of lamination, arisen when laminating and stacking the sub-assembly, and to provide a manufacturing method of the same. <P>SOLUTION: The supporting film type solid oxide fuel cell stack is formed by laminating a plurality of sub-assemblies formed by wrapping the whole of unit cells of the supporting film type solid oxide fuel cell by an alloy foil provided with an opening for cathode, a gas lead-in hole, and a gas lead-out hole, through an interconnector and an insulation spacer having a wave-shaped part for gas-flow and electric connection. A flat separation plate having a gas flow passage is arranged after laminating a certain number of sub-assemblies, and one or a plurality of sub-assemblies are arranged and laminated again on the separation plate. The manufacturing method of the supporting film type solid oxide fuel cell stack is provided. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a support membrane type solid oxide fuel cell stack and a method for producing the same.

  In a single cell of a solid oxide fuel cell (hereinafter abbreviated as “SOFC” where appropriate), an anode and a cathode are arranged with a solid oxide electrolyte in between, and anode / electrolyte / cathode 3 Consists of layer units. In the present specification, a single cell is also referred to as “cell” as appropriate, and a solid oxide electrolyte is also referred to as “electrolyte” or “electrolyte membrane” as appropriate.

As the electrolyte material, a sheet-like sintered body such as yttria stabilized zirconia (YSZ) is used, and as the anode, a porous body such as a mixture of nickel and yttria stabilized zirconia (Ni / YSZ cermet) is used. For example, a porous body such as Sr-doped LaMnO ₃ is used as the cathode, and a single cell is usually formed by baking the anode and the cathode on both surfaces of the electrolyte material. During the operation, oxygen in the air introduced into the cathode becomes oxide ions (O ²⁻ ) at the cathode and reaches the anode through the electrolyte. Here, it reacts with the fuel introduced into the anode and emits electrons to generate reaction products such as electricity, water and carbon dioxide. Spent air at the cathode is discharged as cathode offgas, and spent fuel at the anode is discharged as anode offgas.

  By the way, a conventional SOFC has a high operating temperature of about 1000 to 800 ° C., but recently, an SOFC operating at a temperature of about 800 to 650 ° C., for example, about 750 ° C. is being developed. FIG. 1 is a diagram illustrating an example of the SOFC cell mode. 1A is a cross-sectional view of a single cell, and FIG. 1B is a perspective view seen from the cathode side. As shown in FIGS. 1A to 1B, the cell is configured such that an electrolyte membrane is disposed on an anode and a cathode is disposed on the electrolyte membrane.

For example, a zirconia-based or LaGaO ₃ -based electrolyte material is used as the solid oxide electrolyte, which is configured to be supported by a thick anode, and is called a support membrane type. In the support membrane type, the thickness of the electrolyte membrane can be reduced. The thickness of the membrane is, for example, about 10 μm, and it can be operated at a low temperature of 800 to 650 ° C. For this reason, it is possible to use a heat-resistant alloy, for example, an inexpensive material such as stainless steel as the constituent material, and there are various advantages such as being able to reduce the size.

  FIG. 2 is a configuration example of an SOFC stack incorporating a single cell configured as described above. Here, it is necessary that air flows between the cathode and the separator A and that the cathode and the separator A are in electrical contact. For this reason, a conductive interconnector having a groove for air circulation is provided between the cathode and the separator A, but the illustration is omitted. The interconnector may be provided separately from the separator A or may be provided integrally therewith.

  As shown in FIG. 2, in the support membrane SOFC stack, the separator A, the separator B, the separator C, the cell, and the separator D are sequentially arranged from the upper part to the lower part. Among these, the separator C is also called a cell support foil. A current collector plate and the like are disposed on the upper part of the separator A, but the illustration is omitted. Separators A to D are made of a heat-resistant alloy such as stainless steel. In FIG. 2, a gap is provided between the anode and the current collector plate, but the two need to be in electrical contact. For this reason, the anode lower surface and the current collector plate may be in direct contact with each other, or nickel felt or the like may be interposed between them. Since the anode is a porous body, fuel contributes to power generation through the anode and its lower surface.

  By the way, also in the support membrane type SOFC operated at a low temperature as described above, since the voltage of one single cell is low, the single cell is usually configured by stacking a plurality of layers electrically in series. A single cell is joined to a cell support foil (ie, separator C in FIG. 2), and is placed and joined so as to fit in a manifold (separators B and D in FIG. 2). A stack is formed by joining to the next unit via a connector. In addition, the fuel, air, anode off-gas, and cathode off-gas flowing through the SOFC stack are all gas, so gas sealing is performed, but it is necessary to sandwich a sealing material between the members in order to improve the sealing performance. For example, in order to construct an SOFC stack, many steps are required in addition to many members.

  The inventors of the present invention have a sub-assembly for supporting membrane type SOFC stack (hereinafter referred to as “hereinafter referred to as“ subassembly ”) which can be configured without many processes with such a large number of members and chains, and which has a significantly reduced gas sealing portion. A ”), a supporting membrane type SOFC stack (hereinafter referred to as“ B ”) and a module using the same have been developed (Japanese Patent Application No. 2003-112202: filed on April 16, 2003). The outline of these subassemblies, stacks, and modules will be sequentially described below.

Japanese Patent Application No. 2003-112202

<A: Sub-assembly for supporting membrane SOFC stack configuration>
The sub-assembly for supporting membrane type SOFC stack construction is provided with a single cell of a supporting membrane type solid oxide fuel cell, an opening for cathode, a hole for introducing gas (opening), and a hole for opening (opening). 2 is a sub-assembly for constructing a support membrane SOFC stack, which is wrapped with an alloy foil plate. 3 to 4 are diagrams showing examples of the configuration. FIG. 3 (a) is a diagram showing the first alloy foil plate 1, FIG. 3 (b) is a diagram showing the second alloy foil plate 2, and is an example in which the alloy foil plate is formed in a strip shape. The alloy foil plate may have a rectangular shape, a square shape, or any other appropriate shape.

  As shown in FIG. 3A, the first strip-shaped alloy foil plate 1 is provided with a cathode opening (window) 3 at the center and fuel circulation openings (holes) 4 and 4 at both ends in the longitudinal direction. The joints 5 and 5 with the second strip-shaped alloy foil plate 2 shown in FIG. 3B are provided at the left and right ends of the longitudinal direction. The second strip-shaped alloy foil plate 2 is provided with fuel distribution openings (holes) 7 and 7 at both ends in the longitudinal direction, and at the left and right ends with respect to the longitudinal direction of the strip-shaped alloy foil plate as shown in FIG. The first strip-shaped alloy foil plate 1 shown in FIG.

  Here, the joint portions 6 and 6 of the second strip-shaped alloy foil plate 2 are formed by bending the end portions thereof, and the joint portions 5 and 5 of the first strip-shaped alloy foil plate 1 have two end portions thereof. Although it is configured to be bent and locked at the joints 6 and 6 of the second strip-shaped alloy foil plate 2, the shape thereof is the joints 6 and 6 of the second strip-shaped alloy foil plate 2. And the joints 5 and 5 of the first strip-shaped alloy foil plate 1 can be configured in an appropriate shape that can be joined by a joining material. The bonding can be performed by welding or a bonding material. As the bonding material, a metal brazing material, a glass bonding material, or the like is used.

  FIG. 3C shows the first strip-shaped alloy foil plate 1 and the second strip-shaped alloy foil plate 2 configured as described above, and the single membrane 10 of the support membrane type SOFC as shown in FIG. FIG. 5 is a view showing an example in which a sub-assembly for supporting membrane SOFC stack configuration is configured using spacers 8 and 8. Here, the SOFC single cell 10 is arranged with the cathode facing upward. The spacers 8, 8 are provided at openings (holes) 4, 4 provided at both ends in the longitudinal direction of the first strip-shaped alloy foil plate 1 and at both ends in the longitudinal direction of the second strip-shaped alloy foil plate 2. It has openings corresponding to the openings (holes) 7 and 7 and is made of an alloy member similar to both strip-shaped alloy foil plates. The spacers 8 and 8 are provided with a plurality of holes 9 on the side surface of the opening so that the gas passes inward.

  As shown in FIG. 3C, first, the single cell 10 is placed in the center of the second strip-shaped alloy foil plate 2. And between the 1st strip-shaped alloy foil board 1 and the 2nd strip-shaped alloy foil board 2, both ends opening (hole) 4, 4 of the longitudinal direction of the 1st strip-shaped alloy foil board 1 and 2nd The spacers 8 and 8 are arranged at positions corresponding to the openings (holes) 7 and 7 in the longitudinal direction of the strip-shaped alloy foil plate 2. Thereafter, the joint portions 5 and 5 of the first strip-shaped alloy foil plate 1 are locked by the joint portions 6 and 6 of the second strip-shaped alloy foil plate 2, and the portion is joined by a joining material.

  FIG. 4 shows the sub-assembly 11 for supporting membrane SOFC stack constructed as described above, FIG. 4 (a) is a perspective view seen from the cathode side, ie, the front side, and FIG. 4 (b) is from the anode side, ie, the back side. FIG. As shown in FIG. 4, this subassembly wraps the entire single membrane of the support membrane type SOFC with an alloy foil plate having an opening for the cathode and a hole for introducing gas (opening) and a hole for opening (opening). Consists of. The sub-assembly for supporting membrane type SOFC stack construction as shown in FIG. 4 can also be produced by folding a single alloy foil plate and wrapping a single cell. According to the configuration in which a single cell is wrapped by folding a single alloy foil plate, the only part to be joined is the end portion facing the bent portion of the alloy foil plate, and the work is simple and easy. It is possible to provide a sub-assembly for supporting membrane type SOFC stack having excellent gas sealing performance.

<B: Stack using sub-assembly A for supporting SOFC stack configuration>
A stack is constructed using the sub-assembly A for constructing the support membrane SOFC stack. As the constituent members, the support membrane SOFC stack constituent subassembly, the insulator member, and the interconnector manufactured as described above are used. The insulator member has an opening corresponding to the opening of the stack subassembly, and is made of a heat resistant material such as mica, and the interconnector is made of a heat resistant alloy such as stainless steel.

  The interconnector is normally configured in a wave shape, and air flow (that is, gas flow) and electrical connection are performed by the wave-shaped portion. That is, the interconnector is configured to include a wave-like portion for air circulation and electrical connection, and this is disposed at a portion corresponding to the cathode of the single cell. The interconnector is based on that point, and is constructed by extending the corrugated part for air flow and electrical connection to both sides and having openings corresponding to the opening of the insulator member and the opening of the subassembly at both ends. May be. In this case as well, the corrugated portion for air circulation and electrical connection is arranged at a portion corresponding to the cathode of the single cell.

  FIG. 5 is a diagram showing a configuration process of a support membrane SOFC stack using the support membrane SOFC stack configuration subassembly 11 as shown in FIG. As an interconnector, an interconnector is used which extends in a planar shape on both sides from the airflow and electrical connection corrugated portion and has openings corresponding to the opening of the insulator member and the opening of the subassembly at both ends thereof. Shows the case. As shown in FIG. 5, the interconnector 13 is provided with openings 14 and 14 corresponding to the openings of the insulator members 12 and 12 and the openings (holes) 4 (7) and 4 (7) of the subassembly 11 at both ends thereof. A corrugated portion (groove) 15 for air circulation and electrical connection is provided at a portion corresponding to the cathode of the single cell 10 in the central portion.

Insulator members 12 and 12 having openings corresponding to the openings 4 (7) and 4 (7) at both ends in the longitudinal direction are placed on the support membrane type SOFC stack constituting subassembly 11, and the interconnector is mounted thereon. By mounting 13, a support membrane type SOFC stack is formed. In FIG. 5, an arrow (↓) indicates the mounting direction. The support membrane type SOFC stack produced in this way is used by arranging current collecting plates on both the upper and lower surfaces and placing it in a casing. FIG. 6 is a cross-sectional view of the central portion in the longitudinal direction of the support membrane SOFC stack constructed as described above.
The above is a stack in which one single cell is arranged. A support membrane SOFC stack having a plurality of single cells is formed by stacking a plurality of the stacks. In the above-mentioned Japanese Patent Application No. 2003-112202, such a laminated structure is called a support membrane type SOFC module.

  However, the support membrane SOFC stack subassembly as described above and the support membrane SOFC stack using the subassembly also have the following problems. If a single cell of a support membrane type SOFC is schematically shown, it becomes a plane as shown in FIG. However, a single cell requires a firing step for its production, and it is difficult to achieve a complete flat surface or an acceptable flat surface for stacking due to a difference in thermal expansion coefficient between members such as an anode and an electrolyte. As shown in FIGS. 7 to 9, warping and distortion occur. 7 is a cross-sectional view, FIG. 8 is a perspective view seen from the cathode side, that is, the front surface, and FIG. 9 is a perspective view seen from the anode side, that is, the back surface.

  The sub-assembly for supporting membrane type SOFC stack construction thus configured may constitute a stack, but the supporting membrane type SOFC is formed by stacking a plurality of them through an interconnector that performs gas flow and electrical connection. Configure the stack. FIG. 10 is a diagram for explaining the mode, and shows the members at intervals in order to show the positional relationship between the members. Although FIG. 10 shows a case where three subassemblies are stacked, the same applies to the case where two subassemblies, four or more subassemblies are stacked.

  As shown in FIG. 10, the subassembly 11, the insulating spacer 21, the interconnector 22, the subassembly 11, the insulating spacer 21, the interconnector 22, the subassembly 11, the insulating spacer 21, and the interconnector 22 are sequentially arranged on the lower base 20. To do. The SOFC stack is configured by applying a load from the top.

  However, a close observation of the SOFC stack constructed in this way revealed that there was room for further improvement. As shown in FIGS. 7 to 9, the cell is slightly warped and distorted, and the thickness varies. Even when the height of the manifold, insulating spacer, and corrugated interconnector is uniform, increasing the number of layers increases the thickness of the gas seal part (left and right parts in FIG. 10) and the current collecting part (center part in FIG. 10). The displacement due to the difference is accumulated. For this reason, it was found that the amount of deformation of the sub-assembly in the upper layer portion was too large, and there were cracks in the cells and poor current collection.

  SUMMARY OF THE INVENTION Accordingly, the present invention provides a support membrane type solid oxide fuel cell stack and a method for manufacturing the same, which solve the above-mentioned problems that occur when stacking the subassembly for supporting membrane type SOFC stack. It is intended.

  The present invention is (1) a subassembly in which an entire single cell of a support membrane type solid oxide fuel cell is wrapped with an alloy foil plate having an opening for a cathode, a hole for introducing gas, and a hole for discharging gas. Is a support membrane type solid oxide fuel cell stack formed by stacking a plurality of the above via an interconnector having an undulating portion for gas flow and electrical connection and an insulating spacer, and a certain number of subassemblies are stacked After that, a support membrane type solid oxide fuel cell stack is provided, in which a smooth partition plate having a gas flow path is disposed, and a predetermined number of subassemblies are disposed and laminated again thereon. To do.

  The present invention is (2) a subassembly in which an entire single cell of a support membrane type solid oxide fuel cell is wrapped with an alloy foil plate having an opening for a cathode and a hole for introducing and a hole for introducing a gas. Of the support membrane type solid oxide fuel cell stack, in which a plurality of the above are stacked via an interconnector having an undulating portion for gas flow and electrical connection and an insulating spacer, After the number is stacked, a smooth partition plate having a gas flow path is disposed, and a predetermined number of subassemblies are again disposed and stacked thereon, and the support membrane type solid oxide fuel cell stack is characterized in that A manufacturing method is provided.

  According to the present invention, when a plurality of sub-assemblies for supporting membrane SOFC stack configuration are stacked and stacked via an interconnector and an insulating spacer that perform gas flow and electrical connection, a certain number of sub-assemblies are formed. After stacking, a smooth partition plate with a gas flow path is placed, and a subassembly is placed and stacked again on top of it, so that accumulation of displacement due to high stacking is initialized, cell cracking and current collection Defective defects can be avoided. Further, according to the present invention, it is possible to produce a high stack having a desired number of stacks by reducing the amount of deformation of the sub-assembly in the upper layer portion, eliminating cell cracking and current collection failure.

  The present invention (1) is a subassembly in which an entire single cell of a support membrane type solid oxide fuel cell is wrapped with an alloy foil plate having a cathode opening, a gas introduction hole, and a lead-out hole. Is a support membrane type solid oxide fuel cell stack formed by stacking a plurality of these via an interconnector and an insulating spacer that perform gas flow and electrical connection. And after laminating | stacking a fixed number of subassemblies, the smooth partition plate provided with the gas flow path is arrange | positioned, and the predetermined number of subassembly is arrange | positioned again and laminated | stacked thereon, It is characterized by the above-mentioned.

  The present invention (2) is a subassembly in which the entire single cell of a support membrane type solid oxide fuel cell is wrapped with an alloy foil plate having an opening for a cathode and a hole for introducing and a hole for introducing a gas. Is a method of manufacturing a support membrane type solid oxide fuel cell stack in which a plurality of the above are stacked through an interconnector and an insulating spacer for gas flow and electrical connection. And after laminating | stacking a fixed number of subassemblies, the smooth partition plate provided with the gas flow path is arrange | positioned, and the predetermined number of subassembly is arrange | positioned and laminated | stacked again on it.

  Here, in the present inventions (1) to (2), a predetermined number of subassemblies are arranged and stacked again on the smooth partition plate having the gas flow path. 2 layers, 3 layers, or 4 layers or more, depending on the above, after laminating a certain number of sub-assemblies, a smooth partition plate with gas flow paths is placed on it and again “A predetermined number of subassemblies are arranged and stacked” means to include a mode in which two, three, or four or more layers are stacked as necessary.

<Constitution Mode of Support Film Type SOFC Stack in which after a certain number of subassemblies are laminated, a smooth partition plate having gas flow paths is arranged, and the subassemblies are arranged and laminated again thereon>
FIG. 11 is a diagram for explaining a mode in which, after a certain number of subassemblies are stacked in the present invention, a smooth partition plate having a gas flow path is disposed, and the subassemblies are disposed and stacked again thereon. . In order to show the arrangement relationship of each member, each member is shown at intervals. Although FIG. 11 shows the case where four subassemblies are stacked, the same applies to the case where three subassemblies, five or more subassemblies are stacked.

  As shown in FIG. 11, the subassembly 11, the insulating spacer 21, the interconnector 22, the subassembly 11, the insulating spacer 21, the interconnector 22, the subassembly 11, the insulating spacer 21, and the interconnector 22 are sequentially formed on the lower base 20. Deploy. Although the case where three subassemblies are stacked is shown, two or four or more subassemblies can be stacked.

  Then, a smooth partition plate 23 having a gas flow path 24 is placed thereon, and the subassembly 11, the insulating spacer 21, and the interconnector 22 are sequentially laminated thereon in the same manner as described above. The SOFC stack is configured by applying a load. As the smooth partition plate 23 provided with the gas flow path 24, a rigid heat-resistant alloy, a ceramic plate, or the like can be used. The required number of partition plates 23 is not limited to one between the plurality of sub-assemblies to be stacked. That is, as shown in FIG. 11 at the lower part thereof, a predetermined number of subassemblies are again arranged and laminated on a smooth partition plate provided with gas flow paths, and the number of lamination stages is necessary. Depending on the situation, it can be laminated in two, three or four or more stages. In these embodiments, the current terminal cable is connected to the lower surface of the subassembly directly above the partition plate 23 and the interconnector directly below the partition plate 23.

  As described above, in the present invention, after stacking a certain number of subassemblies, a smooth partition plate having a gas flow path is disposed, and the subassemblies are disposed and laminated again thereon, thereby achieving high stacking. Accumulation of displacement due to is initialized, and problems such as cell cracking and current collection failure can be avoided. Further, according to the present invention, it is possible to produce a high stack having a desired number of stacks by reducing the amount of deformation of the sub-assembly in the upper layer portion, eliminating cell cracking and current collection failure.

  FIG. 12 shows a mode in which a current collecting current terminal 25 is arranged. Except for the point which arrange | positions the current terminal 25 for current collection on the upper and lower sides of the smooth partition plate 23 provided with the gas flow path 23, it is the same as that of the aspect of FIG. In this embodiment, the current is taken out from the current collecting current terminal 25 through the lead wire.

<Components of Support Membrane SOFC Stack Related to the Present Invention>
In the present invention, after laminating a certain number of subassemblies, a smooth partition plate with a gas flow path is placed, and when placing and laminating the subassemblies again, it corresponds to the shape of the support membrane SOFC. It is useful to use an interconnector having such a configuration. Hereinafter, the configuration of the interconnector will be sequentially described.

  The wavy shape of the waved portion of the interconnector can take various shapes. FIG. 13 is a diagram showing an example of the shape. 13A is a cross-sectional wave shape, FIG. 13B is a cross-sectional zigzag shape, FIG. 13C is a cross-sectional marshmallow shape, FIG. 13D is a cross-sectional trapezoidal shape, and FIG. e) is a U-shaped cross-section, and these deformation shapes can be adopted. Here, the wavy portion of the interconnector or the wavy shape thereof in the present specification and claims means not only the wavy shape of the cross section as shown in FIG. 13 (a) but also includes the wavy shape of the cross section. Also used in a comprehensive sense of the above-mentioned various shapes.

  As shown in FIGS. 7 to 9, the surface of the single cell of the support membrane type SOFC, that is, the cathode surface, bulges at the center and gradually curves toward the peripheral edge to cause warping or distortion. Then, when the stack is made, when the corrugated portion of the interconnector is brought into contact with the cathode surface as shown in FIGS. 11 to 12, due to the warpage or distortion, the cathode surface and Contact between the corrugated portions of the interconnector is obstructed, causing uneven electrical contact, increasing contact resistance, and reducing power generation performance. Therefore, a slit is formed in the corrugated portion of the interconnector in parallel with the wave direction. FIG. 15 is a diagram showing this aspect.

  As shown in FIG. 15, a slit is made in the wavy portion in parallel with the wave direction. As a result, the cathode surface of the support membrane type SOFC single cell and the corrugated portion of the interconnector can be brought into contact with each other, and an even electrical contact can be achieved between them. The slits are not limited to the corrugated cross section shown in FIG. 15, but have a zigzag cross section, a marshmallow cross section, a trapezoidal cross section, and a U-shaped cross section as shown in FIGS. In addition to the wavy portion, the present invention can also be applied to the wavy portions having these deformed shapes.

  When stacking single cells of a support membrane type SOFC via an interconnector, the positional relationship between the cathode surface and the corrugated portion of the interconnector is as shown in FIGS. The gap in the corrugated portion of the interconnector serves as an air flow path. As shown in FIG. 16 (a), the air flowing in the flow passage on the side facing the cathode surface of the cell contributes to power generation. However, as shown in FIG. 16 (b), the air flowing through the flow path on the side of the wavy portion that does not face the cathode surface of the cell does not flow through the cathode surface, and does not contribute to power generation. Therefore, a plurality of holes are provided in the corrugated portion of the interconnector. 17 to 18 are diagrams showing such modes.

  As shown in FIGS. 17 to 18, a plurality of holes are provided in the corrugated portion of the interconnector. FIG. 17 shows an embodiment in which a plurality of holes are provided in a wavy portion without slits as shown in FIG. 14A, and FIG. 18 shows a plurality in a wavy portion with slits as shown in FIG. This is a mode of providing the holes. With this hole, the air flowing through the flow path on the side of the undulating portion that does not face the cathode surface of the cell can be circulated to the cathode side and brought into contact with the cathode to contribute to power generation. The plurality of holes are not limited to the corrugated cross section shown in FIGS. 17 to 18, but are zigzag cross section, marshmallow cross section, trapezoidal cross section, and U-shaped cross section as shown in FIGS. 13 (b) to 13 (e). In addition to the wavy portions having a shape, the present invention can also be applied to the wavy portions having these deformed shapes.

  A heat resistant alloy such as stainless steel is used as a constituent material of the alloy foil plate and interconnector constituting the stack in the present invention. Moreover, hydrocarbons, city gas, LP gas, natural gas, gasoline, light oil, kerosene, diesel oil, alcohols (methyl alcohol, ethyl alcohol, etc.), dimethyl ether (DME), etc. are used as fuel to be supplied to the stack. .

The figure explaining the example of the aspect of the cell of SOFC Diagram showing a configuration example of a SOFC stack incorporating a single cell The figure which shows the sub-assembly for supporting membrane type SOFC stack which encloses the whole single cell of a supporting membrane type SOFC with the alloy foil board provided with the opening for cathodes, the hole for gas introduction, and the hole for lead-out. The figure which shows the sub-assembly for supporting membrane type SOFC stack which encloses the whole single cell of a supporting membrane type SOFC with the alloy foil board provided with the opening for cathodes, the hole for gas introduction, and the hole for lead-out. FIG. 4 is a diagram showing a configuration process of a support membrane SOFC stack using a support membrane SOFC stack configuration subassembly as shown in FIG. FIG. 5 is a cross-sectional view of the central portion in the longitudinal direction of the support membrane SOFC stack configured as shown in FIG. Diagram explaining problems that occur in a single cell of a support membrane SOFC Diagram explaining problems that occur in a single cell of a support membrane SOFC Diagram explaining problems that occur in a single cell of a support membrane SOFC The figure explaining the aspect which comprises a support membrane type SOFC stack using the subassembly for support membrane type SOFC stack composition In the present invention, after laminating a certain number of subassemblies, a state is described in which a smooth partition plate having a gas flow path is disposed, and the subassemblies are disposed and laminated again thereon. In the present invention, after laminating a certain number of subassemblies, a state is described in which a smooth partition plate having a gas flow path is disposed, and the subassemblies are disposed and laminated again thereon. The figure which shows the example of a wave-like shape in the wave-like part of the interconnector used for support membrane type SOFC stack structure of this invention The figure explaining the problem resulting from the cathode surface shape of the support membrane type SOFC unit cell The figure which shows the aspect which solves the problem resulting from the cathode surface shape of a support membrane type SOFC single cell The figure explaining the problem resulting from the cathode surface shape of the support membrane type SOFC unit cell The figure which shows the aspect which solves the problem resulting from the cathode surface shape of a support membrane type SOFC single cell The figure which shows the aspect which solves the problem resulting from the cathode surface shape of a support membrane type SOFC single cell

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 1st alloy foil board 2 2nd alloy foil board 3 Opening (window) for cathodes
4, 4 Openings for fuel flow 5, 5 Joints 6, 6 Joints 7, 7 Openings 8, 8 Spacers 9 Multiple holes 10 Single cell 11 Sub-assembly for supporting membrane type SOFC stack 12, 12 Insulator member 13 Inter Connector 14, 14 Opening 15 Wave-shaped part (groove)
DESCRIPTION OF SYMBOLS 20 Lower stand 21 Insulating spacer 22 Interconnector 23 The smooth partition plate provided with the gas flow path 24 24 The gas flow path provided in the partition plate 25 25 Current collecting current terminal

Claims (14)

  Gas flow through a plurality of subassemblies, in which the entire single cell of a supported membrane solid oxide fuel cell is wrapped with an alloy foil plate having a cathode opening, a gas introduction hole, and a gas introduction hole. And a support membrane type solid oxide fuel cell stack formed by stacking via an interconnector having an undulating portion for electrical connection and an insulating spacer, and after stacking a certain number of subassemblies, A support membrane type solid oxide fuel cell stack, comprising: a smooth partition plate provided; and one or more subassemblies are disposed and laminated again thereon.   2. The support membrane type solid oxide fuel cell stack according to claim 1, wherein the smooth partition plate provided with the gas flow path is made of a heat resistant alloy or ceramic. Fuel cell stack.   3. The support membrane type solid oxide fuel cell stack according to claim 1 or 2, wherein the alloy foil plate is a strip-like foil plate.   The support membrane type solid oxide fuel cell stack according to any one of claims 1 to 3, wherein the constituent material of the alloy foil plate is a heat resistant alloy. Fuel cell stack.   The support membrane type solid oxide fuel cell stack according to any one of claims 1 to 4, wherein the wavy portion of the interconnector has a zigzag cross section, a marshmallow cross section, a trapezoidal cross section, or a U-shaped cross section. A supported membrane solid oxide fuel cell stack, characterized in that   6. The support membrane type solid oxide fuel cell stack according to claim 5, wherein the interconnector includes a corrugated portion in a portion in contact with the cathode, and a slit is formed in the corrugated portion in parallel with the wave direction. A supported membrane solid oxide fuel cell stack, characterized in that   7. The support membrane type solid oxide fuel cell stack according to claim 5 or 6, wherein the interconnector comprises a corrugated portion in contact with the cathode and a plurality of holes in the corrugated portion. A support membrane type solid oxide fuel cell stack.   Gas flow through a plurality of subassemblies, in which the entire single cell of a supported membrane solid oxide fuel cell is wrapped with an alloy foil plate having a cathode opening, a gas introduction hole, and a gas introduction hole. And a support membrane type solid oxide fuel cell stack formed by laminating via an interconnector having an undulating portion for electrical connection and an insulating spacer, and after laminating a certain number of subassemblies, A method for producing a support membrane type solid oxide fuel cell stack, wherein a smooth partition plate having a flow path is disposed, and one or more subassemblies are again disposed and laminated thereon.   9. The support membrane type solid oxide fuel cell stack manufacturing method according to claim 8, wherein the smooth partition plate provided with the gas flow path is made of a heat resistant alloy or ceramic. A method for producing a solid oxide fuel cell stack.   10. The support membrane type solid oxide fuel cell stack according to claim 8 or 9, wherein the alloy foil plate is a strip-like foil plate. Manufacturing method.   The method for producing a support membrane solid oxide fuel cell stack according to any one of claims 8 to 10, wherein the constituent material of the alloy foil plate is a heat resistant alloy. A method for manufacturing an oxide fuel cell stack.   12. The method for manufacturing a support membrane solid oxide fuel cell stack according to claim 8, wherein the wavy portion of the interconnector has a zigzag cross section, a marshmallow cross section, a trapezoidal cross section, or a cross section. A manufacturing method of a support membrane type solid oxide fuel cell stack characterized by being U-shaped.   13. The method for manufacturing a support membrane type solid oxide fuel cell stack according to claim 8, wherein the interconnector includes a corrugated portion in a portion in contact with the cathode, and the wave direction in the corrugated portion. A support membrane type solid oxide fuel cell stack manufacturing method, characterized in that it is an interconnector having slits in parallel with each other. 14. The method of manufacturing a supported membrane solid oxide fuel cell stack according to claim 8, wherein the interconnector includes a corrugated portion in a portion in contact with the cathode, and a plurality of corrugated portions are provided in the corrugated portion. A method for producing a support membrane type solid oxide fuel cell stack, wherein the interconnector is provided with a hole.

Images