JP2009245663A - Solid oxide fuel cell and manufacturing method therefor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a single chamber type solid oxide fuel cell which arranges a plurality of cells on a support substrate and has superior mechanical strength and generates electricity by mixed gas of fuel gas and oxidant gas. <P>SOLUTION: The solid oxide fuel cell comprises the elaborate support substrate 1, wherein at least its surface has insulation and a plurality of first through-holes and at least one second through-hole are formed; a plurality of unit cells respectively arranged to cover the first through-holes and formed, by sandwiching an electrolyte 51 by a fuel electrode 61 and an air electrode 41; and at least one inter-connector 3 passing through the second hole and connecting the unit cell arranged on one surface of the support substrate and the unit cell arranged on the other surface of the support substrate. Each unit cell is arranged on one surface of the support substrate so as to block the first through-hole with an electrolyte. One electrode is arranged on one surface of the electrolyte, the other electrode is arranged on the other surface of the electrolyte exposed via the first through-hole, and the second through-hole is blocked by the inter-connector. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

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

A fuel cell is a cell that can directly convert chemical energy generated when fuel is oxidized into electric energy while continuously supplying fuel from the outside and exhausting combustion products. The types of fuel cells are classified according to the electrolyte, and those using metal oxides having ion conductivity for the electrolyte are called solid oxide fuel cells. Various types of solid oxide fuel cells have been proposed. For example, Patent Document 1 discloses a fuel electrode (anode), an electrolyte, and an air electrode (cathode) on the surface of a porous cylindrical body. ) Is a so-called horizontal-striped cylindrical solid oxide fuel cell in which a plurality of single cells stacked in this order are arranged. In this battery, since a plurality of single cells are arranged on the surface of the cylindrical body, high voltage and high output can be achieved.
Japanese Patent No. 3110237

  By the way, in the said battery, since the cylindrical body which is a support body is formed with the porous body, there exists a possibility that damages, such as a crack, may arise, and there existed a problem from a viewpoint of mechanical strength. Further, although the above battery has a cylindrical shape, there is a similar problem when a porous substrate is used in a flat plate type in which cells are supported by a supporting substrate. Further, as in the above invention, the conventional solid oxide fuel cell is a two-chamber type system that supplies fuel gas and oxidant gas separately, and therefore requires a gas seal material and a separator. The system structure was complicated.

  The present invention has been made in order to solve the above-described problem. A plurality of cells can be arranged on a support substrate, and the mechanical strength is excellent, and a single power generation is performed using a mixed gas of a fuel gas and an oxidant gas. Since it is a chamber type system, it aims at providing a solid oxide fuel cell which can simplify a module and a system structure.

  The solid oxide fuel cell according to the present invention has been made to solve the above-mentioned problems, and has a dense support substrate in which a plurality of through-holes having at least an insulating surface are formed, and the first each At least one first and second group of single cells, each of which is arranged so as to close the through-hole of the substrate and sandwiching the electrolyte between the fuel electrode and the air electrode, and at least one surface or the other surface of the support substrate. At least one interconnector arranged on one side and connecting the plurality of unit cells, wherein the first group of unit cells is configured such that the electrolyte closes the through hole from one side of the support substrate. One electrode is formed on one surface of the electrolyte, and the other electrode is formed on the other surface of the electrolyte exposed through the through hole. An electrolyte is disposed so as to close the through hole from the other surface side of the support substrate, one electrode is formed on the other surface of the electrolyte, and one electrode is formed on one surface of the electrolyte exposed through the through hole. An interconnector formed on one side of the support substrate connects one electrode of the first group of single cells to the other electrode of the second group of single cells, and The interconnector arranged on the other surface connects the other electrode of the first group of single cells to one electrode of the second group of single cells.

  According to this configuration, since the dense support substrate is used, the mechanical strength of the battery can be improved. In addition, a plurality of single cells are arranged as follows. That is, a plurality of through holes are formed in the support substrate, and the first group of single cells and the second group of single cells are arranged so as to close the through holes from one side or the other side of the support substrate. . In this way, a plurality of single cells are formed on a dense support substrate to increase the output. At this time, each electrode is exposed on one side and the other side of the support substrate. Therefore, it can be used as a so-called single-chamber battery having a simple structure capable of supplying a mixed gas of a fuel gas and an oxidant gas to either one side or the other side of the support substrate.

  The dense support substrate referred to in the present invention refers to a support substrate that is dense enough not to allow gas to permeate. For example, a metal substrate or a metal oxide substrate can be used. In order to make the support substrate insulative, for example, an insulating metal oxide (ceramics or the like) can be used as it is, or a conductive metal with an oxide film formed on the surface can be used. . As a method for forming the oxide film, for example, a conductive metal can be sintered to oxidize the surface, or an insulating film can be coated.

  The first method for producing a solid oxide fuel cell according to the present invention has been made to solve the above-described problem. A support substrate is provided on each of one surface and the other surface of an insulating dense support substrate. Forming at least one electrolyte so as not to completely overlap with each other, forming a through-hole so that an electrolyte on one surface side is exposed from the other surface of the support substrate, and one surface of the support substrate Forming a through-hole so that the electrolyte on the other surface side is exposed, and forming a fuel electrode or an air electrode on the surface of each electrolyte opposite to the through-hole. A step of forming the other electrode on the surface exposed through each through hole in each electrolyte, and one electrode on the electrolyte on the one surface of the support substrate and the through hole. Forming an interconnector so as to connect the other exposed electrode, and connecting the one electrode on the electrolyte and the other electrode exposed from the through hole on the other surface of the support substrate; Forming an interconnector.

  Further, the second method for producing a solid oxide fuel cell according to the present invention is made to solve the above-described problem, and each of the one surface and the other surface of the insulating dense support substrate is provided with: Forming at least one electrolyte so as not to completely overlap with the support substrate interposed therebetween, forming a through-hole so that the electrolyte on one surface side is exposed from the other surface of the support substrate, and Forming a through-hole so that the electrolyte on the other surface side is exposed from one side, forming an insulating film so as to contact the electrolyte on the inner wall surface of each through-hole and the vicinity thereof, Forming one of a fuel electrode and an air electrode on a surface of the electrolyte opposite to each through hole; and exposing the other electrode to a surface exposed through each through hole in each electrolyte. And connecting one electrode on the electrolyte and the other electrode exposed from the through-hole while avoiding a portion where the insulating film is not formed on one surface of the support substrate. Forming an interconnector, and on the other surface of the support substrate, while avoiding a portion where the insulating film is not formed, one electrode on the electrolyte and the other electrode exposed from the through hole Forming an interconnector for connection.

  A third method for producing a solid oxide fuel cell according to the present invention has been made to solve the above-described problem, and a plurality of single cells formed by sandwiching an electrolyte between a fuel electrode and an air electrode. Preparing a cell; forming a plurality of first and second through holes in a dense support substrate having at least an insulating surface; and adhering the electrolyte to a periphery of each of the first through holes. Thus, the step of closing the first through-hole from one surface of the support substrate with the electrolyte and disposing the single cell so that the air electrode is exposed to the other surface of the support substrate; By adhering the electrolyte to the periphery of the through-hole, the second through-hole is closed from the other surface of the support substrate with the electrolyte, and the air electrode is exposed to the one surface of the support substrate. Before placing cells and before Connecting a single-cell fuel electrode disposed in the first through hole to the air electrode exposed from the second through-hole by an interconnector; and a single cell disposed in the second through-hole. Connecting the fuel electrode and the air electrode exposed from the first through hole with an interconnector.

  A fourth method for producing a solid oxide fuel cell according to the present invention has been made to solve the above-described problem, and a plurality of single cells formed by sandwiching an electrolyte between a fuel electrode and an air electrode. Preparing a cell; forming a plurality of first and second through holes in a dense support substrate having at least an insulating surface; and adhering the electrolyte to a periphery of each of the first through holes. Thus, the step of closing the first through hole with the electrolyte from one surface of the support substrate and disposing the unit cell so that the fuel electrode is exposed to the other surface of the support substrate; By adhering the electrolyte to the periphery of the through hole, the second through hole is covered with the electrolyte from the other surface of the support substrate, and the fuel electrode is exposed to the one surface of the support substrate. Before placing cells and before A step of connecting an air electrode of a single cell disposed in the first through hole and the fuel electrode exposed from the second through hole by an interconnector; and a single cell disposed in the second through hole And connecting the fuel electrode exposed from the first through hole with an interconnector.

  According to the method for manufacturing each solid oxide fuel cell as described above, since the dense support substrate is used, the mechanical strength of the cell can be improved. Further, although a dense support substrate is used, a plurality of through holes are formed, and single cells are arranged so as to close the through holes from one side or the other side of the support substrate. Therefore, a single cell in which the fuel electrode is exposed on one surface of the support substrate and a single cell in which the air electrode is exposed on one surface of the support substrate are mixed. Therefore, the solid oxide fuel cell manufactured by this manufacturing method can be used as a single chamber type.

  According to the present invention, it is possible to arrange a plurality of cells on a support substrate, and it is possible to improve mechanical strength.

  An embodiment of a solid oxide fuel cell according to the present invention will be described with reference to the drawings. FIG. 1 is a front sectional view (a) of the solid oxide fuel cell according to the present embodiment, and FIG. 2 is a plan view (b) of the solid oxide fuel cell of FIG.

  As shown in FIG. 1, this solid oxide fuel cell is a so-called single-chamber fuel cell, and five single cells 2 are arranged on a support substrate 1 in which a plurality of through holes 11 are formed. These are connected in series by the interconnector 3. Here, the single cells that close the through holes 11 from the upper surface of the support substrate 1 are referred to as first, second, and third single cells 21 to 23, and the single cells that close the through holes 11 from the lower surface of the support substrate 1 are the fourth. , 5th single cell.

  The support substrate 1 is formed of a dense metal substrate, and five rectangular through holes 11 are formed in the substrate 1 at a predetermined interval. The single cells 21 to 25 supported by the support substrate 1 are formed by sandwiching a thin film electrolyte between 51 to 55, the air electrodes 41 to 45, and the fuel electrodes 61 to 65. First, the first to third unit cells 21 to 23 will be described. These single cells 21 to 25 have rectangular electrolytes 51 to 53 that close the through holes 11 from the upper surface of the support substrate 1. And the rectangular fuel electrodes 61-63 are arrange | positioned at the upper surface of each electrolyte 51-53. In addition, air electrodes 41 to 43 are disposed on the lower surfaces of the electrolytes 51 to 53 exposed from the lower side of each through hole 11. That is, the air electrodes 41 to 43 are arranged in the through hole 11.

  Next, the fourth and fifth single cells 24 and 25 will be described. These single cells 24, 25 have rectangular electrolytes 54, 55 that close the through holes 11 from the lower surface of the support substrate 1. In addition, rectangular air electrodes 44 and 45 are disposed on the upper surfaces of the electrolytes 54 and 55 exposed from the upper side of the through hole 11. That is, the air electrodes 44 and 45 are disposed in the through hole 11. In addition, fuel electrodes 64 and 65 are disposed on the lower surfaces of the electrolytes 54 and 55.

  Each interconnector 3 is wired on the upper surface and the lower surface of the support substrate 1 to connect adjacent single cells. For example, on the upper surface of the support substrate 1, the fuel electrode 61 of the first single cell 21 and the air electrode 44 of the fourth single cell 24 are connected by the interconnector 3. Similarly, the second and fifth single cells 22 and 25 are also connected by the interconnector 3. On the lower surface of the support substrate 1, the air electrode 44 of the fourth unit cell 24 and the fuel electrode 62 of the second unit cell 22 are connected by the interconnector 3, and the fifth and third unit cells 25, 23 are also connected. Are also connected by an interconnector 3.

  Subsequently, materials constituting the fuel cell will be described. The support substrate 1 is made of a dense material and may be made of a material made of a metal and a metal oxide. For example, as the metal material, Fe, Ti, Cr, Cu, Ni, and Ag can be used, and one kind may be used alone, or two or more kinds may be alloyed. For example, stainless steel heat resistant materials can be used, and specifically, austenitic stainless steel and ferritic stainless steel can be used. In this embodiment, the insulating support substrate 1 is used. However, in order to make the above metal substrate insulative, for example, there is a method of oxidizing the surface by heating in air. . In addition, an insulating film such as alumina can be formed on the metal surface by coating by a vacuum film forming method or a sol-gel method. In addition, it is preferable that the thickness of this support substrate 1 is 50-5000 micrometers.

  As the materials of the electrolytes 51 to 55, those known as electrolytes for solid oxide fuel cells can be used. For example, ceria oxide (GDC) doped with samarium or gadolinium, strontium or magnesium Oxygen ion conductive ceramic materials such as lanthanum galade oxides and zirconia oxides (YSZ) containing scandium and yttrium can be used.

  The fuel electrodes 61 to 65 and the air electrodes 41 to 45 can be formed of a ceramic powder material. The average particle size of the powder used at this time is preferably 10 nm to 100 μm, more preferably 50 nm to 50 μm, and particularly preferably 100 nm to 10 μm. In addition, an average particle diameter can be measured according to JISZ8901, for example.

  As the fuel electrodes 61 to 65, for example, a mixture of a metal catalyst and a ceramic powder material made of an oxide ion conductor can be used. As the metal catalyst used at this time, a material that is stable in a reducing atmosphere, such as nickel, iron, cobalt, or a noble metal (platinum, ruthenium, palladium, etc.) and has hydrogen oxidation activity can be used. In addition, as the oxide ion conductor, one having a fluorite structure or a perovskite structure can be preferably used. Examples of those having a fluorite structure include ceria-based oxides doped with samarium, gadolinium, and the like, and zirconia-based oxides containing scandium and yttrium. In addition, examples of those having a perovskite structure include lanthanum galide oxides doped with strontium and magnesium. Among the above materials, it is preferable to form the fuel electrode with a mixture of an oxide ion conductor and nickel. The mixed form of the ceramic material made of the oxide ion conductor and nickel may be a physical mixed form, or may be a powder modification to nickel or a nickel modification to ceramic material. Good. Moreover, the ceramic material mentioned above can be used individually by 1 type or in mixture of 2 or more types. Further, the fuel electrodes 61 to 65 can be configured by using a metal catalyst alone.

As the ceramic powder material forming the air electrodes 41 to 45, for example, a metal oxide made of Co, Fe, Ni, Cr, Mn or the like having a perovskite structure or the like can be used. Specifically, (Sm, Sr) CoO ₃ , (La, Sr) MnO ₃ , (La, Sr) CoO ₃ , (La, Sr) (Fe, Co) O ₃ , (La, Sr) (Fe, Co , Ni) O _{3 and the} like, and (La, Sr) (Fe, Co) O ₃ is preferable. The ceramic material mentioned above can be used individually by 1 type or in mixture of 2 or more types.

The interconnector 3 is made of a conductive metal material such as Pt, Au, Ag, Ni, Cu, or a stainless steel material, or La (Cr, Mg) O ₃ , (La, Ca) CrO ₃ , (La, Sr) CrO _3. A lanthanum chromite-based conductive metal oxide material such as these may be used, and one of these may be used alone, or two or more may be used in combination.

  The electrolytes 51 to 55, the fuel electrodes 61 to 65, the air electrodes 41 to 45, and the interconnector 3 can be formed by, for example, a wet coating method or a dry coating method. Examples of the wet coating method include a screen printing method, an electrophoresis (EPD) method, a doctor blade method, a spray coating method, an ink jet method, a spin coating method, and a dip coating method. In that case, these electrolyte, fuel electrode, air electrode, and interconnector need to be made into a paste, and are formed by adding appropriate amounts of a binder resin, an organic solvent, and the like with the above-described material as a main component. More specifically, it is preferable to add a binder resin or the like so that the main component is 50 to 95% by weight in the mixing of the main component and the binder resin. Examples of dry coating methods include vapor deposition, sputtering, ion plating, chemical vapor deposition (CVD), electrochemical vapor deposition, ion beam, laser ablation, and atmospheric pressure plasma deposition. Alternatively, it can be formed by a low pressure plasma film forming method or the like. The thickness of the electrolytes 51 to 55 is formed to be 5 to 500 μm, and more preferably 10 to 100 μm. Moreover, although the film thickness of the fuel electrodes 61-65 and the air electrodes 41-45 is formed so that it may become 5-100 micrometers, it is still more preferable that it is 5-50 micrometers.

  Next, a method for manufacturing the solid oxide fuel cell configured as described above will be described with reference to the drawings. 2 and 3 are explanatory views showing a method of manufacturing the solid oxide fuel cell according to the present embodiment.

  First, an insulating support substrate 1 is prepared (FIG. 2A), and a plurality of electrolytes 51 to 55 are formed at predetermined intervals on the upper and lower surfaces (FIG. 2B). At this time, each electrolyte 51-55 is arrange | positioned so that it may slip | deviate in zigzag form across the support substrate 1. FIG. That is, it is good that only a part overlaps, but it does not overlap most. In this example, the electrolytes 51 to 53 of the first to third single cells on the upper surface of the support substrate 1 are arranged at a predetermined interval, and the electrolytes 54 and 55 of the fourth and fifth single cells on the lower surface of the support substrate 1 are arranged. , And arranged between the electrolytes 51 to 53 on the upper surface of the support substrate 1. In the production, after applying an electrolyte paste at a predetermined shape and interval, this is dried and sintered for a predetermined time to form dense electrolytes 51 to 55. Alternatively, a plate-like electrolyte can be attached.

  Next, a through hole is formed by etching. First, the two through holes 11 are formed so that the electrolytes 54 and 55 on the lower surface side are exposed from the upper surface of the support substrate 1. Subsequently, the three through holes 11 are formed so that the upper surface side electrolytes 51 to 53 are exposed from the lower surface of the support substrate 1. Subsequently, the fuel electrode paste is applied to the upper surfaces of the electrolytes 51 to 53 on the upper surface side of the support substrate 1, and dried and sintered for a predetermined time, whereby the fuel electrodes 61 to 63 are formed. Similarly, the fuel electrode paste is applied also to the lower surfaces of the electrolytes 54 and 55 on the lower surface side of the support substrate 1, and the fuel electrodes 64 and 65 are formed by drying and sintering for a predetermined time (FIG. 3A). ). Next, an air electrode is formed in the through-hole 11 opened on the upper surface side. That is, the air electrode paste is applied to the upper surfaces of the electrolytes 54 and 55 exposed on the upper surface side through the through holes 11, and dried and sintered for a predetermined time to form the air electrodes 44 and 45. Similarly, the air electrode paste is applied to the lower surfaces of the electrolytes 51 to 53 exposed to the lower surface side through the through holes 11, and dried and sintered for a predetermined time to form the air electrodes 41 to 43. Thus, five single cells 21 to 25 are completed.

  Subsequently, the interconnector 3 is formed at two places on the upper surface of the support substrate 1. First, the fuel electrode 61 of the first unit cell 21 and the air electrode 44 of the fourth unit cell 24 are connected. The air electrode 44 is exposed from the through hole 11. Similarly, the fuel electrode 62 of the second unit cell 22 and the air electrode 45 of the fifth unit cell 25 are connected. Following this, interconnectors 3 are also formed at two locations on the lower surface of the support substrate 1. That is, the fuel electrode 64 of the fourth unit cell 24 and the air electrode 42 of the second unit cell 22 are connected. Similarly, the fuel electrode 65 of the fifth unit cell 25 and the air electrode 43 of the third unit cell 23 are connected. Each of the interconnectors 3 is formed by applying a paste for the interconnector and then drying and sintering for a predetermined time (FIG. 2C). Through the above steps, the solid oxide fuel cell shown in FIG. 1 is completed.

  The fuel cell configured as described above generates power as follows. First, a mixed gas of fuel gas and oxidant gas is supplied to the upper surface side and the lower surface side of the support substrate 1. The fuel gas is composed of hydrogen or a hydrocarbon such as methane or ethane, and the oxidant gas is composed of air or the like. Thus, since the fuel electrodes 61 to 65 and the air electrodes 41 to 45 are selectively in contact with the fuel gas and the oxidant gas, respectively, the electrolytes 51 to 55 are disposed between the fuel electrodes 61 to 65 and the air electrodes 41 to 45. Oxygen ion conduction occurs, and power generation is performed.

  As described above, according to the embodiment, since the dense support substrate 1 is used, the mechanical strength of the battery can be improved. The plurality of through holes 11 are formed in the support substrate 1, and the single cells 21 to 25 are arranged so as to close the through holes 11 from the upper surface or the lower surface side of the support substrate 1. In this way, a plurality of single cells are formed on a dense support substrate to increase the output. At this time, since each electrode is exposed on both the upper surface side and the lower surface side of the support substrate 1, it can be used as a single-chamber battery having a simple structure.

  As mentioned above, although embodiment of this invention was described, this invention is not limited to these, A various change is possible unless it deviates from the meaning of this invention. For example, in the above-described embodiment, the insulating support substrate 1 is used. However, a conductive substrate can be used, and the substrate can be insulated by coating an insulating film in the manufacturing process. Hereinafter, this process will be described with reference to FIG.

  Even when a conductive metal substrate is used, FIGS. 2A to 2C are the same as those in the above embodiment. Subsequently, as shown in FIG. 4A, after the through holes 11 are formed, the insulating layer 7 such as alumina is formed from the inner wall surface of each through hole 11 and the position in contact with the electrolytes 51 to 55 at the periphery thereof. Coat with. The subsequent steps are the same as in FIG. 3, and the fuel electrodes 61 to 65 (FIG. 4B), the air electrodes 41 to 45 (FIG. 4C), and the interconnector 3 are formed (FIG. 4 (d)), the fuel cell is completed. However, when the interconnector 3 is formed, in order to prevent a short circuit, the paste is not applied to the portion of the support substrate 1 where the insulating film 7 is not coated. In this example, even if a conductive metal substrate is used, it can be used as the insulating support substrate 1 if it is coated with the insulating film 7 in a later step.

  Moreover, in the said embodiment, although the air electrodes 41-45 are formed in the through-hole 11, the fuel electrodes 61-65 can also be arrange | positioned. That is, the positions of the fuel electrode and the air electrode may be interchanged.

  Furthermore, the solid oxide fuel cell according to the present invention can be formed by the method shown in FIG. First, as shown in FIG. 5A, an insulating or conductive substrate 1 is prepared. Subsequently, as shown in FIG. 5B, a plurality of through holes 11 similar to those described above are formed in the substrate 1 by etching. Thereafter, when a conductive substrate is used, an insulation process is performed. That is, the surface of the substrate is oxidized by sintering or an insulating film is coated. Subsequently, as shown in FIG. 5C, a plurality of fuel electrode-supporting single cells 2 having the fuel electrode 6 as a substrate are prepared. The material and manufacturing method of this single cell are as described above. At this time, the electrolyte 5 and the fuel electrode 6 have the same planar shape, but the air electrode 4 is formed smaller than that and smaller than the through hole 11.

  And as shown in FIG.5 (d), each single cell 21-23 is arrange | positioned from the upper surface side and the lower surface side of the board | substrate 1 so that the through-hole 11 may be block | closed. In the drawing, the cells 21 and 23 at both ends close the through hole 11 (first through hole) from the upper surface of the substrate 1, and the central single cell 22 passes through the through hole (second through hole) from the lower surface of the substrate 1. ) 11 is blocked. In the single cells 21 and 23 at both ends, the air electrode 4 is disposed so as to be exposed from the lower surface of the substrate 1 through the through hole 11. On the other hand, in the central single cell 22, the air electrode 4 is disposed so as to be exposed from the upper surface of the substrate 1 through the through hole 11. At this time, the peripheral edge of the electrolyte 5 is bonded to the peripheral edge of the through hole 11 by the welding material 9 in any of the single cells 21 to 23. As such a welding material 9, silver, gold | metal | money, platinum, copper, the compound containing these metals, etc. can be used, for example. Following this, as shown in FIG. 5 (e), adjacent single cells are connected by a wire-like interconnector 3. The interconnector 3 connects the fuel electrode 6 not accommodated in the through hole 11 and the air electrode 4 accommodated in the through hole 11. That is, for example, the fuel electrode 6 of the leftmost single cell 21 and the air electrode 4 of the central single cell 22 are connected by the interconnector 3. The interconnector 3 is connected to the air electrode 4 through the through hole 11. The interconnector 3 and the electrodes 4 and 6 are connected by, for example, a ceramic paste for spot welding or adhesive fixing. Even with such a manufacturing method, the same effects as described above can be obtained.

  In this method, as the interconnector, various types such as mesh and paste printing can be used in addition to the wire. Further, the single cell used in this method may be an electrolyte support type using an electrolyte substrate instead of the fuel electrode support type as described above. That is, as shown in FIG. 6A, an electrolyte-supporting single cell 2 is prepared. In the single cell 2, the fuel electrode 6 and the air electrode 4 are formed on both surfaces of the electrolyte substrate 5, respectively. The air electrode 4 is smaller than the through hole 11. Then, as shown in FIG. 6B, the single cell 2 is fixed to the substrate 1 by bonding the electrolyte 5 and the periphery of the through hole 11 with the welding material 9. The air electrode 4 is fitted into the through hole 11 as in FIG. With this configuration, the same effect as described above can be obtained.

1 is a front sectional view and a plan view showing an embodiment of a solid oxide fuel cell according to the present invention. It is a figure which shows the manufacturing method of the solid oxide fuel cell of FIG. It is a figure which shows the manufacturing method of the solid oxide fuel cell of FIG. It is a figure which shows the other example of the manufacturing method of the solid oxide fuel cell of FIG. It is a figure which shows the further another example of the manufacturing method of the solid oxide fuel cell of FIG. It is a figure which shows the further another example of the manufacturing method of the solid oxide fuel cell of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Support substrate 11 Through-holes 21-23 1st-3rd single cell (1st group single cell)
24, 25 Fourth and fifth single cells (second group of single cells)
3 Interconnectors 41 to 45 Air electrodes 51 to 55 Electrolytes 61 to 65 Fuel electrodes 7 Insulating film

Claims (5)

A dense support substrate having a plurality of through-holes having at least an insulating surface;
Each of the first and second groups of single cells, each of which is arranged so as to close each of the first through holes, and is configured by sandwiching an electrolyte between the fuel electrode and the air electrode;
At least one interconnector that is disposed on at least one of the one surface or the other surface of the support substrate and connects the plurality of single cells; and
The single cells of the first group are arranged so that the electrolyte closes the through hole from one surface side of the support substrate, and one electrode is formed on one surface of the electrolyte, and is exposed through the through hole. The other electrode is formed on the other surface of the electrolyte,
The unit cells of the second group are arranged so that the electrolyte closes the through hole from the other surface side of the support substrate, and one electrode is formed on the other surface of the electrolyte, and is exposed through the through hole. One electrode is formed on one side of the electrolyte
The interconnector disposed on one surface of the support substrate connects one electrode of the first group of single cells and the other electrode of the second group of single cells,
The interconnector disposed on the other surface of the support substrate is a solid oxide fuel cell that connects the other electrode of the first group of single cells and one electrode of the second group of single cells.   The solid oxide fuel cell according to claim 1, wherein the support substrate has an insulating coating formed on a surface of a conductive substrate. Forming at least one electrolyte on each of one side and the other side of the dense insulating support substrate so as not to completely overlap the support substrate;
Forming a through-hole so that the electrolyte on one side is exposed from the other side of the support substrate;
Forming a through hole so that the electrolyte on the other surface side is exposed from one surface of the support substrate;
Forming one of a fuel electrode and an air electrode on a surface of each electrolyte opposite to each through hole;
Forming the other electrode on the surface exposed through each through-hole in each electrolyte; and
Forming an interconnector on one side of the support substrate to connect one electrode on the electrolyte and the other electrode exposed from the through hole;
Forming an interconnector on the other surface of the support substrate so as to connect one electrode on the electrolyte and the other electrode exposed from the through hole;
A method for producing a solid oxide fuel cell. Forming at least one electrolyte on each of one side and the other side of the dense insulating support substrate so as not to completely overlap the support substrate;
Forming a through-hole so that the electrolyte on one side is exposed from the other side of the support substrate;
Forming a through hole so that the electrolyte on the other surface side is exposed from one surface of the support substrate;
Forming an insulating film in contact with the electrolyte on the inner wall surface of each through-hole and in the vicinity thereof;
Forming one of a fuel electrode and an air electrode on a surface of each electrolyte opposite to each through hole;
Forming the other electrode on the surface exposed through each through-hole in each electrolyte; and
An interconnector is formed on one surface of the support substrate so as to connect one electrode on the electrolyte and the other electrode exposed from the through hole while avoiding a portion where the insulating film is not formed. Steps,
An interconnector is formed on the other surface of the support substrate so as to connect one electrode on the electrolyte and the other electrode exposed from the through hole while avoiding a portion where the insulating film is not formed. Steps,
A method for producing a solid oxide fuel cell. Preparing a plurality of single cells formed by sandwiching an electrolyte between a fuel electrode and an air electrode;
Forming a plurality of first and second through holes in a dense support substrate having at least an insulating surface; and
By adhering the electrolyte to the periphery of each first through hole, the first through hole is closed with the electrolyte from one surface of the support substrate, and the air electrode is exposed to the other surface of the support substrate. Arranging the single cells as follows:
By adhering the electrolyte to the periphery of each second through-hole, the second through-hole is closed with the electrolyte from the other surface of the support substrate, and the air electrode is exposed to one surface of the support substrate. Arranging the single cells as follows:
Connecting a single-cell fuel electrode disposed in the first through hole and the air electrode exposed from the second through hole by an interconnector;
Connecting a single-cell fuel electrode disposed in the second through-hole and the air electrode exposed from the first through-hole by an interconnector;
A method for producing a solid oxide fuel cell.

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