JP2005317292A - Supporting film type solid oxide fuel cell stack - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a supporting film type solid oxide fuel cell stack of which, the problem caused by a gap formed between an oxidant gas distribution member and itself is solved. <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 fuel gas lead-in opening, and a fuel gas lead-out opening, through an interconnector and an insulation spacer having a wave-shaped part for fuel gas-flow and electric connection. A heat insulating cushion member, having electrical insulation property and restraining the permeation of the gas, is inserted into a gap between the stack and the oxidant gas distribution member distributing the oxidant gas to the stack. 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 more particularly to a support membrane type solid oxide fuel cell stack provided with an oxidant gas distribution member such as air.

  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 cathode on both surfaces of the electrolyte material.

During the operation, oxygen in the oxidant gas (air, oxygen-enriched air, oxygen, etc., hereinafter referred to as air as appropriate) introduced into the cathode becomes oxide ions (O ²⁻ ) at the cathode, and the electrolyte Through to the anode. 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 for explaining the configuration of the SOFC cell. 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.

As the solid oxide electrolyte, for example, an electrolyte material such as zirconia or LaGaO ₃ is used, and the electrolyte material is configured to be supported by a thick anode, which is called a support membrane type. In the support membrane type SOFC, the thickness of the electrolyte membrane can be reduced. The thickness of the membrane becomes, 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 a constituent material, and there are various advantages such as miniaturization.

  FIG. 2 is a diagram showing a configuration example of a support membrane type 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, the anode and the current collector plate are shown with a gap between them, but they 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, since the fuel, air, anode offgas, and cathode offgas flowing through the support membrane SOFC stack are all gases, they are sealed between each member. In order to construct a support membrane type SOFC stack, for example, it is necessary to sandwich a sealing material between them, many processes are required in addition to many members.

  The inventors of the present invention can construct a sub-assembly for supporting membrane SOFC stack, which can be configured without many processes with such a large number of members and chains, and has a gas-sealed portion greatly reduced. The supporting membrane type SOFC stack and module used have been developed first (Japanese Patent Application No. 2003-112202: filed on April 16, 2003). Hereinafter, the outline of the sub-assembly, the stack, and the assembly will be sequentially described.

Japanese Patent Application No. 2003-112202

<About sub-assembly for supporting membrane type SOFC stack>
The sub-assembly for supporting membrane type SOFC stack comprises a supporting membrane type SOFC stack in which the entire single cell of the supporting membrane type SOFC is wrapped with an alloy foil plate having an opening for cathode, an opening for introducing fuel gas, and an opening for outlet. A construction sub-assembly. 3 to 4 are diagrams showing an example of the configuration, FIG. 3 shows a forming process, and FIG. 4 shows a sub-assembly formed in the forming process of FIG. FIG. 3A is a view showing the first alloy foil plate 1, and FIG. 3B is a view showing the second alloy foil plate 2. This is an example in which the alloy foil plate is formed in a strip shape, but the alloy foil plate may be a rectangular shape, a square shape, or any other appropriate shape.

  As shown in FIG. 3A, the first strip-shaped alloy foil plate 1 includes a cathode opening (window) 3 at the center thereof and fuel gas distribution openings 4 and 4 at both ends in the longitudinal direction. And it is comprised by providing the junction parts 5 and 5 with the 2nd strip-shaped alloy foil board 2 shown in FIG.3 (b) in the right-and-left both ends with respect to the longitudinal direction. The 2nd strip-shaped alloy foil board 2 is equipped with the opening 7 for fuel gas distribution | circulation at the both ends of the longitudinal direction. And it is comprised by providing the junction parts 6 and 6 with the junction parts 5 and 5 of the 1st strip-shaped alloy foil board 1 shown to Fig.3 (a) in the right-and-left both ends with respect to the longitudinal direction of the strip-shaped alloy foil board. .

  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 first strip-shaped alloy foil plate 1 can be formed in an appropriate shape that can be joined to the joint portions 5 and 5. 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.

  A supporting membrane type SOFC stack constituting sub-assembly is configured using the first strip-shaped alloy foil plate 1 and the second strip-shaped alloy foil plate 2 configured as described above. FIG. 3 (c) is a diagram showing the formation process. These alloy foil plates 1 and 2, the supporting membrane SOFC single cell 10 as shown in FIG. Configure. Here, the single cell 10 is arranged with the cathode facing upward. The spacers 8, 8 are openings 4, 4 provided at both ends in the longitudinal direction of the first strip-shaped alloy foil plate 1 and openings 7 provided at both ends in the longitudinal direction of the second strip-shaped alloy foil plate 2, 7 and 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 fuel gas can pass toward the inside.

  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 4 and 4 of the longitudinal direction of the 1st strip-shaped alloy foil board 1, and 2nd strip shape Spacers 8 and 8 are disposed at positions corresponding to both end openings 7 and 7 in the longitudinal direction of the alloy foil plate 2. In FIG. 3C, the arrow (→ ←) indicates the insertion direction of the spacers 8 and 8. 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 space between them is joined by welding or 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, the subassembly is configured by wrapping the entire support membrane type SOFC single cell with an alloy foil plate having a cathode opening, a fuel gas introduction opening, and a lead-out opening. 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.

<Stack using sub-assembly for supporting membrane SOFC stack configuration>
A stack is configured using a sub-assembly for supporting membrane SOFC stack configuration. 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 constituting 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 includes openings 14 and 14 corresponding to the openings of the insulator members 12 and 12 and the openings 4 (7) and 4 (7) of the subassembly 11 at both ends. A corrugated portion (groove) 15 for air flow and electrical connection is provided at a portion corresponding to the cathode of the single cell 10.

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. A support membrane SOFC stack is formed by mounting 13. 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 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.

  The sub-assembly for supporting membrane type SOFC stack configuration configured as described above may constitute a stack, but a plurality of the sub-assemblies are stacked via an interconnector for air circulation and electrical connection. Thus, a support membrane type SOFC stack is formed. FIG. 7 is a diagram for explaining the mode, and shows the members at intervals in order to show the positional relationship of the members. Although FIG. 7 shows a case where three subassemblies are stacked, the same applies to a case where two subassemblies are stacked, and a case where four or more subassemblies are stacked.

  As shown in FIG. 7, 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. The SOFC stack is configured by applying a load from the top. FIG. 8 is a diagram showing a mode in which a current collecting current terminal is arranged at the center of the lower surface of the lowermost subassembly, and the other points are the same as the mode of FIG.

  When power is generated using the support membrane SOFC stack configured as described above, the fuel flows as indicated by the dotted arrows (------>) in FIG. 7, and flows through the anode in each subassembly 11 to generate power. Contributes and is discharged as anode off-gas. Then, the air is circulated toward the gap formed by the wave-like portion of each interconnector 22, that is, the air flow passage. Therefore, a distribution member for evenly distributing air toward the flow path is juxtaposed. FIG. 9 is a diagram showing an arrangement relationship of the distribution members with respect to the SOFC stack.

  As shown in FIG. 9, an air distribution member 24 is disposed on the side of the SOFC stack. The distribution member 24 includes a large number of holes 26 on one surface of a casing 25 having a shape corresponding to the shape of the SOFC stack. The air introduced into the casing 25 is discharged from a large number of holes 26 and circulates toward an air flow passage formed by the corrugated portion of the interconnector.

  However, in this case, the oxidant gas distribution member 24 is generally formed of a refractory metal (alloy) and is disposed with a gap between the sub-assemblies in order to prevent a short circuit between the sub-assemblies constituting the SOFC stack. The Then, during power generation, as shown by thick arrows in FIG. 9, air flows out from this gap, and the amount of air that reaches the cathode of the subassembly is relatively reduced, so that the performance of the stack is lowered. If an attempt is made to increase the air flow rate to compensate for this, the power for that will increase, and the efficiency of the system will decrease.

  Accordingly, the present invention provides a support membrane type solid oxide fuel cell stack which solves the above-mentioned problems caused by the gap between the support membrane type solid oxide fuel cell stack and the oxidant gas distribution member. It is intended to do.

  The present invention provides a plurality of subassemblies 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 cathode, an opening for introducing fuel gas, and an opening for discharging gas, A support membrane type solid oxide fuel cell stack that is electrically connected in series and laminated with an interconnector having an undulating portion for circulating an oxidant gas and an insulating spacer, and the stack A support membrane type solid oxide fuel cell stack comprising an insulating cushion member that is electrically insulating and suppresses gas permeation in a gap between the oxidant gas distribution member and the stack. provide.

  According to the present invention, by inserting a heat insulating cushion member that is electrically insulating and suppresses gas permeation into the gap between the support membrane type SOFC stack and the oxidant gas distribution member, air from the gap is inserted. The outflow can be suppressed. As a result, the power generation performance of the stack with the same amount of air can be improved.

  In the present invention, a plurality of sub-assemblies, in which a single cell of a support membrane type SOFC is wrapped with an alloy foil plate having a cathode opening, a fuel gas introduction opening and a discharge opening, are electrically connected in series. It is a support membrane type SOFC stack formed by stacking via an insulating connector and an interconnector having a wave-like portion for connecting and flowing an oxidant gas. A heat insulating cushion member that is electrically insulating and suppresses gas permeation is interposed in the gap between the support membrane type SOFC stack and the oxidant gas distribution member to the stack.

  FIGS. 10 to 11 show a support membrane SOFC in the present invention by inserting a heat insulating cushion member that is electrically insulating and suppresses gas permeation into the gap between the support membrane SOFC stack and the oxidant gas distribution member. It is a figure explaining the aspect which comprises a stack. 10 to 11 show an SOFC stack in which four subassemblies are stacked, but the same applies to the case where three subassemblies or five or more subassemblies are stacked.

  As shown in FIG. 10, a heat insulating cushion member 27 that is electrically insulating and suppresses gas permeation is inserted in a gap between the support membrane SOFC stack and the oxidant gas distribution member 24. The constituent material of the cushion member 27 to be inserted may be any material that is electrically insulating and has a heat insulating cushioning property that suppresses the permeation of gas. Examples thereof include ceramic fibers and glass fibers. These are used in the form of wool (a lump of fibers resembling wool) or mat (felt).

  The heat insulating cushion member 27 that is electrically insulating and suppresses gas permeation includes a peripheral surface of the air supply side surface of the support membrane SOFC stack, and a peripheral surface of the oxidant gas distribution member 24 corresponding to the peripheral surface. Since it arrange | positions between these, it arrange | positions with the shape match | combined with the shape of the peripheral surface. When ceramic fibers or glass fibers are used as the constituent material, it is preferable to insert these fibers in the form of wool or mat in advance.

  FIG. 11 shows a state in which an insulating cushion member that is electrically insulating and suppresses gas permeation is inserted in the gap between the support membrane type SOFC stack and the oxidant gas distribution member to the stack. According to the present invention, by interposing an insulating cushion member that is electrically insulating and suppresses gas permeation from the gap between the support membrane SOFC stack and the oxidant gas distribution member 24. Oxidant gas outflow can be suppressed. For this reason, the power generation performance of the SOFC stack with the same oxidant gas amount can be improved.

<Constituent Member Related to the Present Invention: Configuration Mode of Interconnector>
In the present invention, an interconnector having a configuration corresponding to the shape of a single cell or subassembly of a support membrane type SOFC as an interconnector having an undulating portion for making an oxidant gas flow while being electrically connected in series It is useful to use 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. 12 is a diagram showing an example of the shape. 12 (a) is a corrugated cross section, FIG. 12 (b) is a zigzag cross section, FIG. 12 (c) is a marshmallow cross section, FIG. 12 (d) is a trapezoidal cross section, 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 in the present specification and claims means not only the cross-sectional wavy shape as shown in FIG. 12A but also includes the cross-sectional wavy shape. Also used in a comprehensive sense of the above-mentioned various shapes.

  The surface of the single cell of the supporting membrane type SOFC, that is, the cathode surface, bulges at the center and gradually curves toward the peripheral edge, causing warping or distortion. Then, when making the stack, as shown in FIGS. 5 to 6, when the interconnector corrugated portion 15 is brought into contact with the cathode surface, as shown in FIG. 13B as a non-contact portion due to warpage or distortion. The contact between the cathode surface and the corrugated portion of the interconnector is obstructed, resulting in 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. 14 is a diagram showing this aspect.

  As shown in FIG. 14, a slit is made in the wavy portion in parallel with the wave direction. Thereby, the cathode surface of the single cell of the support membrane type SOFC and the corrugated portion of the interconnector can be brought into contact evenly, and an even electrical contact can be achieved between them. This slit is not limited to the corrugated shape shown in FIG. 14, but has a zigzag sectional shape, a marshmallow sectional shape, a trapezoidal sectional shape, and a U-shaped sectional shape 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 through an interconnector, the positional relationship between the cathode surface and the corrugated portion of the interconnector is as shown in FIGS. And the space | gap of the corrugated part 15 of an interconnector becomes an air flow path. As shown in FIG. 15 (a), the air flowing in the flow path on the side facing the cathode surface of the cell contributes to power generation. However, as shown in FIG. The air flowing through the flow path on the side not facing the cathode surface will not flow through the cathode surface, and will not contribute to power generation.

  Therefore, a plurality of holes are provided in the corrugated portion of the interconnector. FIG. 16 is a diagram showing this aspect. As shown in FIGS. 16A to 16B, a plurality of holes are provided in the corrugated portion of the interconnector. FIG. 16A shows an embodiment in which a plurality of holes are provided in a wave-like portion where no slit is provided as shown in FIG. 13A, and FIG. 16B shows that a slit is provided as shown in FIG. In this embodiment, a plurality of holes are provided in the corrugated portion. With the plurality of holes, 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 FIG. 16, 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 corrugated portion of the shape, the present invention can be applied to the corrugated portion of 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 a single cell of support membrane type SOFC Diagram showing a configuration example of a SOFC stack incorporating a single cell The figure which shows the structural example of the subassembly which wraps the whole single cell of a support membrane type SOFC with the alloy foil board provided with the opening for cathodes, the opening for fuel gas introduction, and the opening for extraction The figure which shows the structural example of the subassembly which wraps the whole single cell of a support membrane type SOFC with the alloy foil board provided with the opening for cathodes, the opening for fuel gas introduction, and the opening for extraction The figure which shows the structure process of a support membrane type SOFC stack using a 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. The figure explaining the aspect which comprises a support membrane type SOFC stack using the subassembly for support membrane type SOFC stack composition The figure explaining the aspect which comprises a support membrane type SOFC stack using the subassembly for support membrane type SOFC stack composition The figure which shows the arrangement | positioning relationship which arranged the oxidizing gas distribution member side by side with respect to the support membrane type SOFC stack The figure explaining the aspect which comprises a heat insulating cushion member which suppresses permeation | transmission of an electric insulation and gas in the space | interval between a stack and an oxidizing gas distribution member in this invention, and comprises a support membrane type SOFC stack. The figure explaining the aspect which comprises a heat insulating cushion member which suppresses permeation | transmission of an electric insulation and gas in the space | interval between a stack and an oxidizing gas distribution member in this invention, and comprises a support membrane type SOFC stack. The figure which shows the example of an aspect of the wavy shape in the wavy part of an interconnector The figure explaining the problem resulting from the cathode surface shape of the single cell of the support membrane type SOFC The figure which shows the aspect which puts a slit in the wavy part of an interconnector in parallel with the wave direction, and is comprised. The figure explaining the problem of the corrugated part of the interconnector with respect to the cathode surface of the single cell of support membrane type SOFC The figure which shows the aspect which provides a some hole in the corrugated part of an interconnector

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 1st alloy foil board 2 2nd alloy foil board 3 Opening for cathodes (window)
4, 4 Openings for fuel gas flow 5, 5 Joints 6, 6 Joints 7, 7 Openings for fuel gas flow 8, 8 Spacer 9 Multiple holes 10 Single cell 11 Sub-assembly for supporting membrane type SOFC stack 12, 12 Insulator member 13, 22 Interconnector 14, 14 Opening 15 Corrugated part (groove)
DESCRIPTION OF SYMBOLS 20 Lower base 21 Insulating spacer 23 Current collector terminal 24 Oxidant gas distribution member 25 Casing 26 Many holes provided on one surface of the casing 27 Insulating cushion member that is electrically insulating and suppresses gas permeation

Claims (8)

  A plurality of subassemblies in which a single cell of a support membrane type solid oxide fuel cell is encased in an alloy foil plate having a cathode opening, a fuel gas introduction opening and a discharge opening are electrically connected in series. And a support membrane type solid oxide fuel cell stack formed by stacking via an insulating spacer and an interconnector having a wave-like portion for circulating an oxidant gas, and oxidizing the stack and the stack A support membrane type solid oxide fuel cell stack, wherein a heat insulating cushion member that is electrically insulating and suppresses permeation of gas is interposed in a gap between the agent gas distribution member and the gas distribution member.   2. The support membrane type solid oxide fuel cell stack according to claim 1, wherein the insulating cushion member is electrically insulating and suppresses gas permeation inserted in a gap between the stack and the oxidant gas distribution member. Is a cushion member made of ceramic fiber or glass fiber, and a supported membrane solid oxide 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 interconnector is an interconnector having a corrugated portion at a portion in contact with a cathode. Support membrane type solid oxide fuel cell stack.   The support membrane type solid oxide fuel cell stack according to any one of claims 1 to 4, wherein the interconnector includes a corrugated portion at a portion in contact with the cathode, and the corrugated portion is parallel to the wave direction. A support membrane type solid oxide fuel cell stack, characterized by being an interconnector having slits.   The support membrane type solid oxide fuel cell stack according to any one of claims 1 to 4, wherein the interconnector includes a corrugated portion at a portion in contact with the cathode, and a plurality of holes are provided in the corrugated portion. A support membrane type solid oxide fuel cell stack characterized by being an interconnector. The support membrane type solid oxide fuel cell stack according to any one of claims 5 to 7, 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

Images