JP5181600B2 - Solid oxide fuel cell, stack structure of solid oxide fuel cell, and manufacturing method of solid oxide fuel cell - Google Patents

Description

  The present invention relates to a solid oxide fuel cell, a stack structure of a solid oxide fuel cell, and a method for manufacturing a solid oxide fuel cell.

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 a solid oxide having ionic conductivity for the electrolyte are called solid oxide fuel cells. This solid oxide fuel cell is roughly classified into two types, that is, a flat plate type and a cylindrical type electrolyte. For example, Patent Document 1 discloses a cylindrical solid oxide fuel cell in which an air electrode, an electrolyte layer, and a fuel electrode are formed in this order on a cylindrical porous substrate tube. Such a cylindrical solid oxide fuel cell has a good gas sealing property.
JP 2003-346843 A

  However, although the cylindrical solid oxide fuel cell has an advantage that gas sealing is easy, it has a problem that it lacks stability when being stacked because it is cylindrical.

  Accordingly, the present invention provides a solid oxide fuel cell, a stack structure of a solid oxide fuel cell, and a method for manufacturing a solid oxide fuel cell that can be easily sealed and have a stable stack structure. This is the issue.

  A first solid oxide fuel cell according to the present invention has been made to solve the above problems, and has a rectangular tube-shaped support member having a conductive and porous shape and a rectangular cross-section. A first interconnector having a denseness extending on one outer surface of the member from one end in the axial direction to the other end; and on each outer surface of the support member so as to cover the remaining outer surface of the support member A self-supporting membrane type or supporting membrane type flat single cell, each of which is laminated and laminated in the order of either the fuel electrode or the air electrode, the electrolyte, and the other electrode from the respective outer side surfaces, and the support member And a conductive welding layer formed in a pattern and welded to the support member and the single cell, and the other electrode of the adjacent single cell are connected to each other and interposed between the single cell and the single cell. And a boundary between adjacent electrolytes A second interconnector having a denseness formed so as to close the first interconnector, the first interconnector and the single cell adjacent to the first interconnector, and the first interconnector And an insulating gas seal installed so as to cover a support member exposed from between the single cell adjacent to the first interconnector.

  According to this configuration, first, a cylindrical support member is used. The cylindrical support member is covered with the first interconnector, the gas seal, and the single cell, and the electrolyte and the electrolyte between adjacent single cells. The boundary part between the two is covered by the second interconnector. Since the first and second interconnectors, the gas seal, and the single cell electrolyte do not transmit gas, the gas can be supplied separately inside and outside the cylindrical support member. It can be done easily. In addition, although a cylindrical support member is used, since this support member is a rectangular tube having a rectangular cross section, these solid oxide fuel cells can be stably stacked. Stack structure can be obtained.

  Conventionally, since the dipping method has been adopted as a method of forming the fuel electrode, the electrolyte, and the air electrode on the cylindrical support member, if the support member has a rectangular tube shape, the corner portion is uniform. There is a problem that it is difficult to form a fuel electrode or the like with a thickness. However, since the first solid oxide fuel cell has a configuration in which the single cell is joined to the support member via the weld layer, the problem that the thickness tends to be non-uniform can be solved. . Note that the term “denseness” as used in the present invention refers to denseness that does not allow fuel gas and oxidant gas used for power generation of the fuel cell to permeate.

  Further, a second solid oxide fuel cell according to the present invention is made to solve the above-described problems, and has a rectangular cross-sectional support member having a rectangular cross section having conductivity and porosity. A first interconnector having a denseness that extends from one end in the axial direction to the other end on one outer surface of the support member, and each outer surface of the support member so as to cover the remaining outer surface of the support member A self-supporting membrane type or support membrane type flat unit cell laminated in order of either one of the electrode of the fuel electrode and the air electrode, the electrolyte, and the other electrode from the respective outer side surfaces; Connected between the supporting member and each single cell, and welded to the supporting member and the single cell, and has a conductive and porous welding sheet, and the other electrode of the adjacent single cell connected to each other And between adjacent electrolytes The first interconnector formed so as to close the boundary portion and having a dense property, the first interconnector, and the single cell adjacent to the first interconnector are joined, and the first interconnector is joined. And an insulating gas seal installed so as to cover a support member exposed from between the interconnector and the single cell adjacent to the first interconnector.

  According to this configuration, first, a cylindrical support member is used. The cylindrical support member is covered with the first interconnector, the gas seal, and the single cell, and the electrolyte and the electrolyte between adjacent single cells. The boundary part between the two is covered by the second interconnector. Since the first and second interconnectors, the gas seal, and the single cell electrolyte do not transmit gas, the gas can be supplied separately inside and outside the cylindrical support member. It can be done easily. In addition, although a cylindrical support member is used, since this support member is a rectangular tube having a rectangular cross section, these solid oxide fuel cells can be stably stacked. Stack structure can be obtained.

  Conventionally, since the dipping method has been adopted as a method of forming the fuel electrode, the electrolyte, and the air electrode on the cylindrical support member, if the support member has a rectangular tube shape, the corner portion is uniform. There is a problem that it is difficult to form a fuel electrode or the like with a thickness. However, since the first solid oxide fuel cell has a structure in which the single cell is joined to the support member via the welding sheet, the problem that the thickness tends to be non-uniform can be solved. .

  In addition, the stack structure of the solid oxide fuel cell according to the present invention is made to solve the above problems, and includes a plurality of first or second solid oxide fuel cells, and a single solid oxide fuel cell. The physical fuel cell is connected in series with the other solid oxide fuel cell by connecting the first interconnector to the other electrode of the other solid oxide fuel cell.

  According to this configuration, since the first or second solid oxide fuel cell is used, as described above, a stable stack structure can be obtained while having good gas sealing properties. Also, a large voltage can be obtained by connecting one fuel cell and another fuel cell in series.

  The first method for producing a solid oxide fuel cell according to the present invention has been made to solve the above-mentioned problem, and has a rectangular cross-sectional support having a conductive and porous shape. A step of preparing a member, a step of preparing three self-supporting membrane type or support membrane type single cells in which a fuel electrode, an electrolyte and an air electrode are laminated in this order, and an axial direction on one side surface of the support member Forming a first interconnector having a denseness so as to extend from one end to the other end, and a conductive weld layer on each remaining outer surface of the support member or on each single cell. A step of forming a pattern; and on each remaining outer surface of the support member, either the fuel electrode or the air electrode of each unit cell is placed on the outer surface side through the weld layer. Laminating each single cell so that it faces, and each single cell In a state of being laminated on each side surface of the holding member, the step of melting the welding layer and welding it to the cylindrical support member and the single cell, and connecting the other electrode to each other and the boundary between the adjacent electrolytes Forming a dense second interconnector so as to close the portion, joining the first interconnector to a single cell adjacent to the first interconnector, and the first interconnector. And installing an insulating gas seal so as to cover the support member exposed from between the single cell adjacent to the first interconnector.

  According to the first manufacturing method, first, the cylindrical support member is prepared, and the first interconnector, the gas seal, and the single cell are formed so as to cover the support member, and between the adjacent single cells. A second interconnector is formed so as to block a boundary portion between the electrolyte and the electrolyte. Since the first and second interconnectors, the gas seal, and the single cell electrolyte do not transmit gas, the gas can be supplied separately inside and outside the cylindrical support member. It can be done easily. In addition, although a cylindrical support member is used, since this support member is a rectangular tube having a rectangular cross section, these solid oxide fuel cells can be stably stacked. Stack structure can be obtained.

  Conventionally, since the dipping method has been adopted as a method of forming the fuel electrode, the electrolyte, and the air electrode on the cylindrical support member, if the support member has a rectangular tube shape, the corner portion is uniform. There is a problem that it is difficult to form a fuel electrode or the like with a thickness. However, since the first manufacturing method uses a method in which a single cell is first prepared and the single cell is bonded to a support member via a welding layer, the problem that the thickness tends to be uneven is solved. You can also

  The second method for producing a solid oxide fuel cell according to the present invention has been made to solve the above-mentioned problems, and has a rectangular cross-sectional support with a rectangular cross section having conductivity and porosity. A step of preparing a member, a step of preparing three self-supporting membrane type or support membrane type single cells in which a fuel electrode, an electrolyte and an air electrode are laminated in this order, and an axial direction on one side surface of the support member Forming a first interconnector having a denseness so as to extend from one end of the support member to the other end, and a welding sheet having conductivity and porosity on each remaining outer surface of the support member. , Stacking the single cells such that either one of the fuel electrode and the air electrode of each single cell faces the outer surface side, and stacking the single cells on each side surface of the support member In this state, the welding support sheet is melted to form the cylindrical support portion. And a step of welding to a single cell, a step of forming a second interconnector having a denseness so as to connect the other electrodes and close a boundary portion between the adjacent electrolytes, and the first Joining to the interconnector and the single cell adjacent to the first interconnector and covering the support member exposed from between the first interconnector and the single cell adjacent to the first interconnector And a step of installing an insulating gas seal.

  According to the second manufacturing method, first, the cylindrical support member is prepared, and the first interconnector, the gas seal and the single cell are formed so as to cover the support member, and between the adjacent single cells. A second interconnector is formed so as to block a boundary portion between the electrolyte and the electrolyte. Since the first and second interconnectors, the gas seal, and the single cell electrolyte do not transmit gas, the gas can be supplied separately inside and outside the cylindrical support member. It can be done easily. In addition, although a cylindrical support member is used, since this support member is a rectangular tube having a rectangular cross section, these solid oxide fuel cells can be stably stacked. Stack structure can be obtained.

  Conventionally, since the dipping method has been adopted as a method of forming the fuel electrode, the electrolyte, and the air electrode on the cylindrical support member, if the support member has a rectangular tube shape, the corner portion is uniform. There is a problem that it is difficult to form a fuel electrode or the like with a thickness. However, since the second manufacturing method uses a method in which a single cell is first prepared and the single cell is joined to a support member via a welding sheet, the problem that the thickness tends to be uneven is solved. You can also

  According to the present invention, there are provided a solid oxide fuel cell, a stack structure of a solid oxide fuel cell, and a method of manufacturing a solid oxide fuel cell, which can be easily gas-sealed and have a stable stack structure. be able to.

  Hereinafter, embodiments of a solid oxide fuel cell according to the present invention and a stack structure using the same will be described with reference to the drawings. FIG. 1 is a front sectional view of a solid oxide fuel cell according to this embodiment, and FIG. 2 is a perspective view of the solid oxide fuel cell according to this embodiment. The axial direction means a direction perpendicular to the paper surface of FIG.

  As shown in FIGS. 1 and 2, the solid oxide fuel cell 1 includes a support member 2 having a rectangular tube shape whose cross section is rectangular. This support member 2 has porosity and conductivity. On the upper surface of the support member 2, a dense first interconnector 3 is formed so as to extend from one end to the other end in the axial direction. Further, the first single cell 4a is laminated so as to cover the right side surface of the support member 2, the second single cell 4b is laminated so as to cover the lower side surface, and the third single cell 4c is laminated so as to cover the left side surface. Yes. Each single cell 4 has a dense electrolyte 41 as a support, and a fuel electrode 42 (one electrode) is formed on the surface of the electrolyte 41 opposite to the outer surface of the support member 2. It is a self-supporting film type in which an air electrode 43 (the other electrode) is formed on one surface. A weld layer 5 formed in a pattern is interposed between each single cell 4 and the support member 2, and the weld layer 5 is welded to the support member 2 and each single cell 4. A single cell 4 is fixed on each outer surface of the support member 2. The upper surface of the support member 2 corresponds to one outer surface in the present invention, and the right side surface, left side surface, and lower surface of the support member 2 correspond to the remaining outer surface in the present invention.

  The second interconnector 6 connects the air electrodes 43 of the adjacent single cells 4 to each other. That is, the air electrode 43a of the first single cell 4a and the air electrode 43b of the second single cell 4b are connected by the second interconnector 6a, and the air electrode 43b of the second single cell 4b and the third The air electrode 43c of the single cell 4c is connected by the second interconnector 6b. In addition, the second interconnector 6 not only electrically connects the air electrode 43 but also extends from the end to the end in the axial direction on the electrolyte 41 to block the boundary portion B between the adjacent electrolytes 41. It is out.

  Moreover, the gas seal 7 joined to the 1st interconnector 3 and the 1st single cell 4a and the 3rd single cell 4c which adjoin this 1st interconnector 3 is formed. More specifically, a gas seal 7a is installed so as to fill a space formed between the first interconnector 3 and the first single cell 4a so that the support member 2 is not exposed. Similarly, a gas seal 7b is installed so that the space formed between the first interconnector 3 and the third single cell 4c is filled so that the support member 2 is not exposed. These gas seals 7 have a function of preventing leakage of fuel gas flowing in the support member 2 to the outside, and the first interconnector 3 and the air electrode 43 of the single cell 4 adjacent thereto are electrically connected. In order to have a function of preventing connection, it has an insulating property.

  Subsequently, materials constituting the fuel cell will be described.

  In consideration of gas permeability and strength, the conductive support member 2 made of a porous material preferably has a porosity in the range of 20 to 60%. From such requirements, as the material constituting the support member 2, conductive metals such as Fe, Ti, Cr, Cu, Ni, Ag, Au, and Pt can be used, and one kind can be used alone. Alternatively, two or more kinds may be mixed. For example, stainless steel heat-resistant materials can be used, and specifically, austenitic stainless steel, ferritic stainless steel, nickel-based heat-resistant alloys such as Inconel and Hastelloy, and the like can be used. In addition, a conductive metal oxide can be used. For example, a lanthanum chromite-based metal oxide material such as La (Cr, Mg) O3, (La, Ca) CrO3, (La, Sr) CrO3 is used. Is possible. Here, the term “porous” means that the pores are connected to each other. The thickness of the support member 2 is preferably 200 to 5000 μm.

  Examples of the material for the weld layer 5 include silver, gold, platinum, copper, and compounds containing these metals. The welded layer 5 preferably has a thickness of 50 μm to 1 mm after being melted and welded to the support member 2 and the single cell 4. The melting point of the weld layer 5 is preferably a temperature that does not cause thermal damage to the support member 2, and specifically, it is preferably 1200 ° C. or less.

  As the material of the electrolyte 41, those known as electrolytes for solid oxide fuel cells can be used. For example, ceria oxide (GDC) doped with samarium or gadolinium, lanthanum doped with strontium or magnesium An oxygen ion conductive ceramic material such as a galide oxide, zirconia oxide (YSZ) containing scandium or yttrium can be used. The thickness of the electrolyte 41 when used as a support is preferably 200 to 1000 μm.

  The fuel electrode 42 and the air electrode 43 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 electrode 42, 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. Of the above materials, the fuel electrode 42 is preferably formed of 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 electrode 42 can also be configured using a metal catalyst alone.

  As the ceramic powder material forming the air electrode 43, 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) CoO3, (La, Sr) MnO3, (La, Sr) CoO3, (La, Sr) (Fe, Co) O3, (La, Sr) (Fe, Co, Ni) O3 (La, Sr) (Fe, Co) O3 is preferable. The ceramic material mentioned above can be used individually by 1 type or in mixture of 2 or more types.

  The fuel electrode 42 and the air electrode 43 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. At this time, the fuel electrode 42 and the air electrode 43 need to be formed in a paste form, 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 fuel electrode 42 and the air electrode 43 are formed to have a film thickness of 5 to 100 μm, and more preferably 5 to 50 μm.

  The first and second interconnectors 3 and 6 are made of a conductive metal or metal oxide material, and can be formed of Pt, Au, Ag, Ni, Fe, Cu, etc., and one of these is used. A seed | species may be used independently and 2 or more types may be mixed and used for it.

  Examples of the material for the gas seal 7 include glass-based materials.

  Next, a method for manufacturing the solid oxide fuel cell configured as described above will be described with reference to the drawings. FIG. 3 is an explanatory diagram showing a method for manufacturing a solid oxide fuel cell according to this embodiment.

  First, a square cylindrical support member 2 is prepared, and a first interconnector 3 is formed on the upper side surface of the support member 2 (FIG. 3A). The method for forming the first interconnector 3 will be described in more detail. First, an appropriate amount of a binder resin, an organic solvent, or the like is added to the above-described interconnector material to form a paste, and this interconnector paste is placed on the support member 2. The first interconnector 3 is formed on the upper surface of the support member 2 by applying it to the side surface by screen printing or the like, and drying and sintering for a predetermined time. The support member 2 can be formed by a known method. For example, the support member 2 can be formed by an extrusion method by kneading the material of the support member 2 with a wax-based lubricant such as methylcellulose.

  Next, three unit cells 4 each having a weld layer 5 formed in a pattern on the fuel electrode 42 side are prepared, and the first unit cell is arranged so that the weld layer 5 of each unit cell 4 faces the support member 2. 4a is arranged on the right side of the support substrate 2, the second single cell 4b is arranged on the lower side, and the third single cell 4c is arranged on the left side (FIG. 3B). Each unit cell 4 can be formed by a known method. For example, first, an electrolyte 41 made of the above material is prepared, and a fuel electrode paste made of the above material is provided on the surface of the electrolyte 41 facing the support member 2. Is screen-printed, dried and sintered for a predetermined time to form the porous fuel electrode 42. Next, the air electrode paste made of the above-described material is applied to the other surface of the electrolyte 41 by screen printing, and dried and sintered for a predetermined time to form the porous air electrode 43. Thus, the single cell 4 can be formed. Further, the method for forming the patterned weld layer 5 on each single cell 4 will be described. The weld layer paste in the form of a paste of the weld layer material is applied on the fuel electrode by screen printing so as to have a predetermined pattern, It is formed by drying and sintering for a predetermined time. In addition, although the shape of the welding layer 5 formed in this pattern shape can take various shapes, for example, as shown in FIG. 6, a meandering shape (FIG. 6A) or a spiral shape (FIG. 6 ( b)), a spot shape (FIG. 6C).

And in the state which has arrange | positioned each single cell 4 to each outer side surface of the supporting member 2 in this way, while applying pressure so that each single cell 4 may be pressed on the support substrate 2 side, temperature higher than melting | fusing point of the welding layer 5 and Heat to In addition, although it changes with materials of the welding layer 5, when the welding layer 5 is comprised with silver, it is preferable to heat at the temperature of 800-1000 degreeC for 1 to 10 hours. Moreover, it is preferable that a pressure shall be 100-10,000 g / cm < ² >. Through the above steps, the welded layer 5 is once melted and welded to the support member 2 and the single cell 4 to fix the single cell 4 to the support member 2 (FIG. 3C).

  Subsequently, in order to electrically connect the air electrode 43 of each single cell 4 fixed to the support member 2 to the air electrode 43 of another adjacent single cell 4, second interconnectors 6a and 6b are formed. (FIG. 3 (d)). Similar to the first interconnector 3, the second interconnectors 6a and 6b are formed by forming an interconnector paste, brushing it, and drying and sintering for a predetermined time. Further, by forming the second interconnector 6 respectively, the gap portion B between the electrolyte 41a of the first single cell 4a and the electrolyte 41b of the second single cell 4b, and the second single cell 4b A gap B between the electrolyte 41b and the electrolyte 41c of the third unit cell 4c is blocked.

  Finally, gas seals 7a and 7b are installed so as to fill the space between the first interconnector 3 and the first single cell 4a and the third single cell 4c adjacent to the first interconnector 3 (FIG. 3 ( e)). More specifically, the gas seals 7a and 7b made of the above materials are applied to the first interconnector 3 and the first single cell 4a and the third single cell 4c adjacent to the first interconnector 3, and bonded by drying and sintering. Let The solid oxide fuel cell 1 is completed through the above steps.

  The fuel cell configured as described above generates power as follows. First, a fuel gas composed of hydrogen or a hydrocarbon such as ethane or ethane is supplied into the support member 2 of the fuel cell 1. Thus, the fuel gas supplied to the inside of the support member 2 passes through the support member 2 and reaches the weld layer 3 side because the support member 2 is porous and gas permeable. Since the weld layer 3 is formed in a pattern, the fuel gas that has reached the weld layer 3 comes into contact with the fuel electrode 42 through a portion where the weld layer 3 is not formed. In parallel with this, an oxidant gas such as air is supplied to the outside of the solid oxide fuel cell 1. Since the air electrode 43 of each single cell 4 is exposed, the oxidant gas supplied to the outside of the fuel cell 1 comes into contact with the air electrode 43 of each single cell 4. Thus, since the fuel electrode 42 and the air electrode 43 come into contact with the fuel gas and the oxidant gas, respectively, oxygen ion conduction through the electrolyte 41 occurs between the fuel electrode 42 and the air electrode 43 of each unit cell 4. Power generation is performed. As described above, power generation is performed in each single cell 4. However, since the support member 2 and the weld layer 3 have conductivity, the fuel electrodes 42 of the single cells 4 connect the weld layer 3 and the support member 2 to each other. Is electrically connected. The air electrodes 43 of the single cells 4 are also electrically connected by the second interconnector 6. Since the single cells 4 are thus connected in parallel, a large current can be obtained.

  The stack structure of the fuel cell configured as described above will be described with reference to the drawings. FIG. 4 is a front sectional view showing the stack structure of the fuel cell according to the present embodiment.

  As shown in FIG. 4, the fuel cell stack structure 10 has three rows of solid oxide fuel cells stacked on the left and right. Each fuel cell 1 stacked vertically includes a first interconnector 3 of the fuel cell 1 disposed on the lower side and an air electrode 43b of the second single cell 4b of the fuel cell 1 stacked on the upper side. They are connected in series with each other by contact. As described above, the fuel cell array in which the fuel cells are stacked one above the other is connected to the first interconnector 3 of the fuel cell 1 disposed on the upper side, and the current collector 8a is disposed on the lower side. The current collector 8b is connected to the air electrode 43b of the first second single cell 4b. Electric power generated by each fuel cell 1 is taken out by the current collectors 8a and 8b. Then, the current collectors 8a arranged on the fuel cell rows are arranged below by the conductive connecting members 9a so that the fuel cell rows arranged in three rows on the left and right are connected in parallel. The current collectors 8b are connected to each other by conductive connecting members 9b.

  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 embodiment, each single cell 4 is fixed to the support member 2 via the weld layer 5 formed in a pattern, but as shown in FIG. 5, the weld layer formed in a pattern. Instead of 5, a sheet-like welding sheet 51 may be employed. In this case, the welding sheet 51 needs to be conductive and have a porous property to allow gas to pass therethrough. The manufacturing method in the case where the welding sheet 51 is employed is substantially the same as the manufacturing method in the case where the welding layer 5 is employed. The difference is that in the manufacturing method employing the above-described welded layer 5, the welded layer 5 is once formed on the fuel electrode side of each unit cell 4, but when the welded sheet 51 is employed, this welded layer 5 is formed. There is no process. That is, each single cell 4 is disposed with the fuel electrode 42 facing the support member 2 side through the welding sheet 51, and the welding sheet 51 is welded to the single cell 4 and the supporting member 2 by melting the welding sheet 51. Then, each single cell 4 is fixed to the support member 2.

  Moreover, in the said embodiment, although each single cell 4 is arrange | positioned so that the fuel electrode 42 may face the support member 2 side, each single cell 4 is arrange | positioned so that the air electrode 43 may face the support member 2 side. You can also. That is, if all the unit cells 4 have the fuel electrode 42 directed to the support member 2 side or all the unit cells 4 have the air electrode 43 directed to the support member 2 side, which electrode faces the support member 2 side. May be suitable.

  In the above-described embodiment, the stack structure 10 has two rows of fuel cells 1 stacked one above the other in three rows on the left and right. However, this number is not particularly limited, and various numbers are available. can do. For example, the fuel cell 1 may have a stack structure in which only the left and right columns are connected in series.

  Moreover, in the said embodiment, although it is set as the self-supporting membrane type single cell 4 which used the electrolyte 41 as the support body, the support membrane type single cell 4 which used the fuel electrode 42 and the air electrode 43 as a support body is also employable. .

1 is a front view showing an embodiment of a solid oxide fuel cell according to the present invention. 1 is a perspective view showing an embodiment of a solid oxide fuel cell according to the present invention. It is explanatory drawing which shows embodiment of the manufacturing method of the solid oxide fuel cell which concerns on this invention. 1 is a front view showing an embodiment of a stack structure of a solid oxide fuel cell according to the present invention. It is a front view which shows other embodiment of the solid oxide fuel cell which concerns on this invention. It is the figure which looked at the single cell of the solid oxide fuel cell which concerns on other embodiment from the welding layer side.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Solid oxide fuel cell 2 Square cylindrical support member 3 1st interconnector 4 Single cell 41 Electrolyte 42 Fuel electrode 43 Air electrode 5 Welded layer 6 Second interconnector 7 Gas seal 10 Solid oxide fuel cell Stack structure

Claims (5)

A rectangular tube-shaped support member having a rectangular cross section having conductivity and porosity;
A first interconnector having a denseness extending from one end in the axial direction to the other end on one outer surface of the support member;
It is laminated | stacked on each outer side surface of the said supporting member so that the remaining outer side surface of the said supporting member may be covered, respectively, and the electrode of one of a fuel electrode and an air electrode from the said each outer surface side, electrolyte, and the other electrode in order. Laminated self-supporting membrane type or supporting membrane type flat single cell,
A conductive weld layer formed in a pattern, which is interposed between the support member and each single cell and welded to the support member and the single cell,
A second interconnector having a denseness, which is formed so as to connect the other electrodes of the adjacent single cells and to close a boundary portion between the adjacent electrolytes;
The first interconnector is joined to the single cell adjacent to the first interconnector, and is exposed from between the first interconnector and the single cell adjacent to the first interconnector. An insulating gas seal installed to cover the support member;
A solid oxide fuel cell comprising: A rectangular tube-shaped support member having a rectangular cross section having conductivity and porosity;
A first interconnector having a denseness extending from one end in the axial direction to the other end on one outer surface of the support member;
It is laminated | stacked on each outer side surface of the said supporting member so that the remaining outer side surface of the said supporting member may be covered, respectively, and the electrode of one of a fuel electrode and an air electrode from the said each outer surface side, electrolyte, and the other electrode in order. Laminated self-supporting membrane type or supporting membrane type flat single cell,
A welded sheet having electrical conductivity and porosity, which is interposed between the support member and each single cell and welded to the support member and the single cell;
A second interconnector having a denseness, which is formed so as to connect the other electrodes of the adjacent single cells and to close a boundary portion between the adjacent electrolytes;
The first interconnector is joined to the single cell adjacent to the first interconnector, and is exposed from between the first interconnector and the single cell adjacent to the first interconnector. An insulating gas seal installed to cover the support member;
A solid oxide fuel cell comprising: A plurality of the solid oxide fuel cells according to claim 1 or 2,
One solid oxide fuel cell is connected in series with another solid oxide fuel cell by connecting the first interconnector to the other electrode of the other solid oxide fuel cell. , Stack structure of solid oxide fuel cell. Preparing a rectangular cylindrical support member having a rectangular cross section having conductivity and porosity;
Preparing three self-supporting membrane type or supporting membrane type single cells in which a fuel electrode, an electrolyte, and an air electrode are laminated in this order;
Forming a first interconnector having a denseness so as to extend from one end in the axial direction to the other end on one side surface of the support member;
Forming a conductive weld layer in a pattern on each remaining outer surface of the support member or on each single cell;
Each single cell is disposed on each remaining outer surface of the support member via the weld layer such that one of the fuel electrode and the air electrode of each single cell faces the outer surface side. Laminating steps;
In the state where each single cell is laminated on each side surface of the support member, the step of melting the weld layer and welding to the cylindrical support member and the single cell;
Forming the second interconnector having a denseness so as to connect the other electrodes and close a boundary portion between the adjacent electrolytes;
A support member that is joined to the first interconnector and the single cell adjacent to the first interconnector and is exposed from between the first interconnector and the single cell adjacent to the first interconnector. Installing an insulating gas seal so as to cover
A method for producing a solid oxide fuel cell. Preparing a rectangular cylindrical support member having a rectangular cross section having conductivity and porosity;
Preparing three self-supporting membrane type or supporting membrane type single cells in which a fuel electrode, an electrolyte, and an air electrode are laminated in this order;
Forming a first interconnector having a denseness so as to extend from one end in the axial direction to the other end on one side surface of the support member;
On each remaining outer surface of the support member, either the fuel electrode or the air electrode of each unit cell faces the respective outer surface side through a conductive and porous welding sheet. Stacking the single cells as described above,
In the state where each single cell is laminated on each side surface of the support member, the step of melting the welding sheet and welding to the cylindrical support member and the single cell;
Forming the second interconnector having a denseness so as to connect the other electrodes and close a boundary portion between the adjacent electrolytes;
A support member that is joined to the first interconnector and the single cell adjacent to the first interconnector and is exposed from between the first interconnector and the single cell adjacent to the first interconnector. Installing an insulating gas seal so as to cover
A method for producing a solid oxide fuel cell.