JP5367941B2 - Connector and solid oxide fuel cell - Google Patents

Description

  The present invention relates to a connector such as an interconnector and a solid oxide fuel cell including the connector.

Conventionally, a solid oxide fuel cell (hereinafter also referred to as SOFC) using a solid electrolyte (solid oxide) is known as a fuel cell.
In this SOFC, as a power generation unit, for example, a solid oxide fuel cell (power generation cell) in which a fuel electrode in contact with fuel gas is provided on one side of a solid electrolyte layer and an air electrode in contact with air is provided on the other side. Is used. A solid oxide fuel cell stack in which a plurality of power generation cells are stacked has also been developed.

  As the above-mentioned SOFC, cylindrical, flat plate, monolithic SOFC, etc. are known. Among these, the monolithic SOFC is a so-called monolithic SOFC in which a solid electrolyte layer and an interconnector (to ensure conduction between cells) are laminated and fired in the state of a ceramic green sheet. This monolithic SOFC is considered to have an excellent stack structure because of high connection reliability between cells and high gas sealing properties.

  By the way, the above-described monolithic SOFC interconnector needs to have conductivity for electrically connecting the cells and a gas flow path for supplying gas between the power generation cell and the interconnector. Therefore, various ideas have been made.

  For example, in Patent Document 1 below, a conductive ceramic sheet formed in a wave shape is used, and in Patent Document 2, a flow path is formed by arranging columnar conductive ceramics on a conductive ceramic plate.

  Separately from this, in Patent Document 3, a flow path is formed by drilling a ceramic sheet, and conductivity is secured by a conductive via. This method is particularly useful for the production of monolithic SOFCs because it uses a green sheet stacking process, so that it is easy to form flow paths and stack, and can select a ceramic material that can be fired simultaneously.

  However, the method using the lamination process of the green sheets has a problem that sheet lamination becomes difficult when the flow path area becomes large, and in particular, alignment of the conductive vias becomes very difficult.

As a method for solving this problem, although it is not a technique related to a monolithic SOFC, a technique for forming a flow path using two sheets (through-hole sheets) having a plurality of through-holes (see Patent Document 4) is used. It is possible to do.
Japanese Unexamined Patent Publication No. 64-41172 JP-A-6-68885 Japanese Patent Laid-Open No. 1-128359 JP 2003-132914 A

  However, when the flow path is formed by laminating two through-hole sheets as in the cited document 4, a conductive via can be formed only in the overlapping portion of the sheets, so that a sufficient gas flow path is secured. When the area of the through hole is increased as described above, the number of conductive vias is reduced, and there is a problem that the conductivity of the interconnector is lowered and the internal resistance is increased.

  Thus, it is conceivable to reduce the area of the through hole in order to increase the number of conductive vias. However, in this case, it becomes difficult to supply gas to the cell surface, and there is a problem that power generation characteristics deteriorate.

That is, conventionally, it has been difficult to achieve both the electrical conductivity of the interconnector and the gas supply performance.
The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a connector and a solid oxide fuel cell capable of ensuring both electrical conductivity of the connector and gas supply performance. There is to do.

  The inventors of the present invention have solved this problem by laminating two types of flat plate portions having different opening areas of the through holes as a result of repeated studies to solve the above-described problems. Hereinafter, each claim will be described.

(1) The invention of claim 1 has a structure in which a conductive via and a gas flow path are formed in a ceramic member, and an air electrode (in contact with an oxidant gas) and (in contact with a fuel gas) on a solid electrolyte layer. In the connector for ensuring electrical continuity with the power generation cell having the fuel electrode, the first flat plate portion having the plurality of first through holes and the second flat plate portion having the plurality of second through holes are the first flat plate portion. The plurality of second through holes are arranged so as to straddle the plurality of first through holes when the connector is viewed from the front side , while being laminated so as to be on the surface side of the connector. And the second through-hole arranged so as to straddle the first through-hole and the first through-hole arranged so as to straddle the second through-hole communicate with each other, and the gas the channel is configured, furthermore, the gas flow path All of the (summed area) total area of the first through hole that forms is, (the sum of the areas) of all of the second through-hole constituting the gas passage is larger than the total area It is characterized by.

  In the connector according to the present invention, the flow of the oxidant gas and the fuel gas supplied to the air electrode and the fuel electrode through the first through hole of the first flat plate portion and the second through hole of the second flat plate portion of the ceramic member. A path (gas flow path) is configured, and conduction with the power generation cell is ensured by the conductive via formed in the overlapping portion of the first flat plate portion and the second flat plate portion.

  Particularly in the present invention, the total area of the first through holes of the first flat plate portion is made larger than the total area of the second through holes of the second flat plate portion, and the first flat plate portion and the second flat plate portion are as described above. By laminating, the number of vias can be increased while maintaining a sufficient gas supply capability.

In the present invention, the number of vias can be increased while maintaining a sufficient gas supply capability for the following reason.
The first flat plate portion of the connector is a portion that directly touches the electrode of the power generation cell. Therefore, gas is supplied to the electrode of the power generation cell at the first through hole portion. That is, the function of the first flat plate portion is to supply gas to the power generation cell, and in order to improve the function, it is desirable to increase the area of the first through hole as much as possible.

  On the other hand, the second flat plate portion does not directly touch the power generation cell, and its function is that the second through hole is disposed so as to straddle the first through holes of the first flat plate portion, and the first flat plate portion first It is connecting through-holes. In other words, the second through hole of the second plane portion does not directly participate in the gas supply to the power generation cell, and thus the second through hole is within a range that does not hinder the gas flow between the first through holes of the first plane portion. The hole area can be reduced.

  Therefore, a large number of conductive vias are formed in the overlapping portion of the first flat plate portion and the second flat plate portion, and the second through hole of the second flat plate portion is narrowed by arranging a large number of conductive vias. By arranging between vias, the number of vias can be increased while maintaining the gas supply capability.

  -In this invention, the area of a through-hole is the opening area (opening area perpendicular | vertical with respect to a penetration direction: flow-path area) of the through-hole used as the flow path of gas. The second through hole straddling the plurality of first through holes means that when the plurality of first through holes and the second through hole are projected in the stacking direction, the projection area of the plurality of first through holes The projection area of 2 through-holes overlaps, indicating that gas can be circulated in the projection direction.

  In addition, as said ceramic member, well-known ceramic materials, such as an alumina, a silica, a spinel, a zirconia, glass ceramics, can be used, for example. Further, as the conductor of the conductive via, a known conductive material such as Pt, Ag, Pd, or an alloy thereof can be used.

(2) The invention of claim 2 is characterized in that the total area of the first through holes is at least twice the total area of the second through holes.
The present invention shows a preferred ratio of the total area of the first through holes and the total area of the second through holes. By setting this ratio, the number of vias can be increased more reliably while maintaining the gas supply capability.

When attention is paid to one of the through holes, the area of the through hole of one first through hole is preferably 10 to 100 mm ² . This is because if less than 10 mm ² , the gas supply capability decreases, and if it exceeds 100 mm ² , the total area of the gas flow path becomes too large, the number of vias decreases, and the conductivity decreases.

On the other hand, the through-hole area of one second through-hole is desirably ² to 10 mm ² . This is because if less than 2 mm ² , the gas supply capability decreases, and if it exceeds 10 mm ² , the number of vias decreases and the conductivity decreases.

(3) The invention of claim 3 is characterized in that an area of the first through hole is larger than an area of the second through hole.
The present invention focuses on one area of each through hole. As this example, the case where all the 1st through-holes are the same shape (or the same area), and the case where all the 2nd through-holes are the same shape (or the same area) is mentioned.

(4) The invention of claim 4 is characterized in that the area of one first through hole is at least twice the area of one second through hole.
This invention has shown the preferable ratio of the area of each 1st through-hole, and the area of each 2nd through-hole. By setting this ratio, the number of vias can be increased more reliably while maintaining the gas supply capability.

(5) The invention of claim 5 is characterized in that the connector is integrally fired (that is, integrally sintered).
Since the connector of the present invention is an integrally fired product, the ceramic portion of the connector is formed by continuously integrating the ceramic structures of each other, and a conventional sealing member is unnecessary.

  Further, when the same kind of ceramic is used for the first flat plate portion and the second flat plate portion, it is preferable because the ceramic interface disappears. Even when the interface disappears, the ceramic portion corresponding to the thickness of the first through hole is the first flat plate portion, and the ceramic portion corresponding to the thickness of the second through hole is the second flat plate portion. is there.

-As a manufacturing method of the connector of this invention, the following method is mentioned, for example.
A green sheet for the first flat plate portion in which the (unfired) conductive via is disposed and the first through hole is formed, and a second sheet in which the (unfired) conductive via is disposed and the second through hole is formed. An integrated sintered product is formed by laminating a green sheet for a flat plate portion and a green sheet on which (unfired) conductive vias are disposed to form an unfired connector and firing the unfired connector. Get a connector that is In this method, the gas flow path can be easily formed by drilling to form the first through hole and the second through hole of the green sheet.

  In addition, the gas passages such as the first through hole and the second through hole of the unfired connector are filled with a combustible material and flattened in order to prevent the gas passage from being crushed in the manufacturing process. Is desirable. The timing of filling the combustible material may be before or after the laminating process for forming the unfired connector, but particularly before the laminating process, that is, after laminating the combustible material in advance in the through hole, The deformation of the green sheet is less preferable. As the combustible material, known materials such as carbon powder, organic beads, and sublimable organic materials can be used. When these flammable materials are used in the form of a paste, the filling process is simplified and the surface can be easily flattened.

  Further, the conductive via can be obtained by opening a through hole (through hole) for the conductive via in the green sheet, filling the through hole with a conductive paste, and firing it (with the ceramic portion) integrally. . As a conductive material of the conductive via, known materials such as Pt, Ag, Pd, and alloys thereof can be used, but it is desirable to use a metal having a melting point lower than the firing temperature.

  (6) In the invention of claim 6, the connector electrically connects the power generation cells to each other, and includes a gas flow path of an oxidant gas in contact with the air electrode and a gas flow path of a fuel gas in contact with the fuel electrode. It is an interconnector which isolate | separates.

  The present invention illustrates an interconnector as a connector. In addition to the interconnector, the present invention is an outer connector, that is, an outer connector that is disposed on the outermost side (in the stacking direction) of the solid oxide fuel cell and is used for conduction between the outermost power generation cell and the outside. Is also applicable.

  (7) In the invention of claim 7, the connector according to any one of claims 1 to 6 and a power generation cell including a solid electrolyte layer, an air electrode, and a fuel electrode are integrally fired (that is, integrated) It is a baked product).

  The solid oxide fuel cell of the present invention is a monolithic solid oxide fuel cell in which the connector and the power generation cell are integrally fired, and has high reliability of electrical connection between the cells and gas sealability. A conventional sealing member can be omitted.

  In other words, in the present invention, the solid electrolyte layer of the power generation cell and the ceramic of the connector are integrated integrally with each other. In particular, when the solid electrolyte layer and the ceramic of the connector are of the same type, the ceramic structures of each other are completely integrated and the interface disappears.

  The power generation cell includes a solid electrolyte layer, an air electrode, and a fuel electrode. Among these, as the solid electrolyte layer, known materials such as YSZ (yttria stabilized zirconia), ScSZ (scandia stabilized zirconia), GDC (gadolinium-added ceria), SDC (samaria-added ceria), and perovskite oxide can be used. In particular, zirconia solid solutions such as YSZ and ScSZ are suitable because of their high material strength and atmospheric stability.

  As the air electrode and the fuel electrode, known ones can be used, but a metal material or a composite of a metal material and ceramics is particularly desirable. It is because the crack and the curvature at the time of baking can be suppressed by setting it as a metal material. As the metal material, Pt, Pd, Ag, Au, Cu, Ni, W, Mo, Fe, Co, and alloys thereof can be used.

  In addition, it is desirable to use noble metals, such as Pt and Ag-Pd, for an air electrode. This is because noble metals are stable in an oxidizing atmosphere. In particular, a metal having a melting point higher than the firing temperature is desirable. This is because simultaneous firing with ceramics is facilitated.

  On the other hand, when the electrode material is a composite of a metal material and ceramics, known ceramics such as alumina, silica, zirconia, ceria, calcia, magnesia, spinel and the like can be used. In particular, it is preferable that the same layer as the solid electrolyte layer can be easily co-fired and the electrode performance is improved.

  As the ceramics for the connector used in the present invention, those that can be sintered at the firing temperature of the solid electrolyte layer, such as alumina, silica, spinel, zirconia, glass ceramics, etc. can be used. In particular, the same kind of material as the solid electrolyte layer is desirable because the thermal expansion is completely the same as the sintering temperature.

  In the case of producing the solid oxide fuel cell of the present invention (for example, a solid oxide fuel cell stack), for example, an unfired power generation cell in which an electrode paste is printed on the front and back of a green sheet for a solid electrolyte layer, The green sheets for interconnectors according to claim 6 are alternately laminated and pressure-bonded to form an unfired solid oxide fuel cell, which is fired to obtain a (monolithic) solid oxide fuel cell. Get.

By this manufacturing method, an integrally fired monolithic solid oxide fuel cell can be easily manufactured without causing warpage or cracking in the fuel cell.
In the above-described invention, the solid electrolyte layer can move, as ions, one part of the fuel gas introduced into the fuel electrode or the oxidant gas introduced into the air electrode when the battery is operated. It has ionic conductivity. Examples of the ions include oxygen ions and hydrogen ions. Further, the fuel electrode comes into contact with the fuel gas that becomes the reducing agent and functions as a negative electrode in the cell. The air electrode is in contact with an oxidant gas serving as an oxidant and functions as a positive electrode in the cell.

In the case where power generation is performed using the solid oxide fuel cell, a fuel gas is introduced to the fuel electrode side and an oxidant gas is introduced to the air electrode side.
As fuel gas, hydrogen, hydrocarbon as a reducing agent, mixed gas of hydrogen and hydrocarbon, fuel gas obtained by passing these gases through water at a predetermined temperature and humidified, and fuel obtained by mixing these gases with water vapor Gas etc. are mentioned. The hydrocarbon is not particularly limited, and examples thereof include natural gas, naphtha, and coal gasification gas. The fuel gas is preferably hydrogen. These fuel gas may use only 1 type and can also use 2 or more types together. Moreover, you may contain inert gas, such as nitrogen and argon of 50 volume% or less.

  Examples of the oxidizing gas include a mixed gas of oxygen and another gas. Further, the mixed gas may contain 80% by volume or less of an inert gas such as nitrogen and argon. Of these oxidant gases, air (containing about 80% by volume of nitrogen) is preferred because it is safe and inexpensive.

Next, an example of the best mode of the present invention will be described.
[Embodiment]
a) A configuration of a monolithic solid oxide fuel cell (specifically, a monolithic solid oxide fuel cell stack: a monolithic SOFC stack) according to the present embodiment will be described with reference to FIGS.

  FIG. 1 is a perspective view of a solid oxide fuel cell stack. FIG. 2 schematically shows a part of the solid oxide fuel cell stack, with the fuel gas flow path and the air flow path being simplified for the sake of simplicity. Are shown in parallel.

  As shown in FIGS. 1 and 2, the solid oxide fuel cell stack 1 of the present embodiment supplies fuel gas (for example, hydrogen) and oxidant gas (for example, air (specifically, oxygen in the air)). It is a device that receives and generates electricity.

  The solid oxide fuel cell stack 1 includes a plate-shaped solid oxide fuel cell 3 that is a power generation unit (power generation cell), and a plate-shaped fuel cell that secures conduction between the cells 3 and blocks a gas flow path. The interconnectors 5 are alternately laminated, and further, plate-like outer connectors 7 are laminated on both outer sides in the lamination direction, and are integrally sintered.

  Among these, as shown in FIG. 2, the solid oxide fuel cell 3 includes a solid electrolyte layer 9 made of a plate-like oxygen ion conductive ceramic material and one side of the solid electrolyte layer 9 (upper side in FIG. 2: The air electrode (cathode) 11 is formed on the front side, and the fuel electrode (anode) 13 is formed on the other side (lower side in FIG. 2: back side).

  Further, the interconnector 5 is provided with a concave fuel gas channel 17 on the front side of the plate-shaped ceramic substrate 15 so as to cover the fuel electrode 13, and on the back side, a concave air channel so as to cover the air electrode 11. 18 is provided.

  Specifically, the ceramic base 15 is composed of the uppermost fuel-side first flat plate portion 19, the lower fuel-side second flat plate portion 21, the lower central plate portion 23, and the lower air-side second flat plate portion. 25 and five ceramic layers composed of the air-side first flat plate portion 27 thereunder are laminated.

  Among these, as shown in FIG. 3, the fuel-side first flat plate portion 19 is provided with a plurality of fuel-side first through holes 29 having the same shape, and the fuel-side second flat plate portion 21 has a fuel-side first plate. A plurality of fuel-side second through holes 31 having the same shape (opening area) smaller than the through hole 29 are provided. The fuel-side second through hole 31 is formed so as to straddle a plurality of adjacent fuel-side first through holes 29, and the fuel gas flow path 17 is configured by both the through holes 29, 31.

The opening shape of the fuel-side first through hole 29 is, for example, a square having an area of 25 mm ² , and the opening shape of the fuel-side second through-hole 31 is, for example, a square having an area of 16 mm ^2. Four fuel-side first through holes 29 communicate with the second through hole 31. The dimension (width) of the frame between the fuel side first through holes 29 is, for example, 1 mm, and the dimension (width) of the frame between the fuel side second through holes 31 is, for example, 2 mm.

  Returning to FIG. 2, similarly to the fuel side, the air-side first flat plate portion 27 is provided with a plurality of air-side first through holes 33 having the same shape, and the air-side second flat plate portion 25 has an air-side first plate. A plurality of air-side second through holes 35 having the same shape and smaller than the first through hole 33 are provided. The air side second through hole 35 is formed so as to straddle a plurality of adjacent air side first through holes 33, and the air flow path 18 is configured by both the through holes 33 and 35. In addition, the opening shape and arrangement | positioning of the air side 1st through-hole 33 and the air side 2nd through-hole 35 are the same as that of a fuel side.

  Further, the interconnector 5 is formed with a via 37 filled with a via conductor so as to penetrate the ceramic substrate 15 in the plate thickness direction, and the via 37 is connected to the upper solid oxide fuel cell 3. The fuel electrode 13 and the air electrode 11 of the lower solid oxide fuel cell 3 are electrically connected.

  In other words, the via 37 is a portion of the ceramic base 15 of the interconnector 5, that is, the fuel-side first flat plate portion 19, the fuel-side second flat plate portion 21, the central flat plate portion 23, the air-side second flat plate portion 25, and the air-side first plate. It arrange | positions so that the 1 flat plate part 27 may be penetrated.

  Further, among the outer connectors 7, the outer connector 7A in the upper part of FIG. 1 includes an upper flat plate portion 39 (similar to the central flat plate portion 23), an air side second flat plate portion 25, and an air side first flat plate portion 27. Laminated.

On the other hand, in the outer connector 7B in the lower part of FIG. 1, a fuel-side first flat plate portion 19, a fuel-side second flat plate portion 21, and a lower flat plate portion 41 (similar to the central flat plate portion 23) are stacked.
b) When the above-described solid oxide fuel cell stack 1 is manufactured, for example, the following procedure is performed.

By using a known method, Pt paste is printed on the front and back of the zirconia green sheet to create an unfired power generation cell.
Next, an unfired interconnector is produced by the method described in detail in Experimental Example 2 later.

  Next, unsintered power generation cells and unsintered interconnectors are alternately laminated and bonded together. At this time, lamination is performed so that the electrode of the power generation cell and the gas flow path and via of the interconnector overlap.

Next, this laminate is cut to a required size to obtain an unfired monolithic solid oxide fuel cell stack.
Next, this unfired monolithic solid oxide fuel cell stack is degreased at 250 ° C. and then fired at 1400 ° C. to produce the solid oxide fuel cell stack 1.

  c) In the solid oxide fuel cell stack 1 of the present embodiment thus obtained, the fuel-side first flat plate portion 19, the fuel-side second flat plate portion 21, the air-side second flat plate portion 25, and the air-side first plate The electrical connection between the upper and lower power generation cells 3 is ensured by the via 37 formed in the overlapping portion of the one flat plate portion 27.

  And in each of the fuel electrode 13 side and the air electrode 11 side, the total area of the 1st through-holes 29 and 33 of each 1st flat plate part 19 and 27 is set to 2nd through-hole 31 of each 2nd flat plate part 21 and 25, 35, and the number of vias is increased while maintaining a sufficient gas supply capability by stacking the first flat plate portions 19 and 27 and the second flat plate portions 21 and 25 as described above. can do.

Next, Example 1 will be described with reference to FIGS. 4 and 5.
In Example 1, the gas supply ability and the number of vias of the SOFC interconnector were verified using the following model.

4 shows the arrangement of the following experimental example B, and FIG. 5 shows the arrangement of the following experimental example D. In both figures, the same number is assigned to the same type of configuration.
-Through-hole arrangement | positioning of a 1st flat plate part As shown in FIG.4 and FIG.5, as shown in following Table 1, about the 1st flat plate part 51, the square 1st through-hole 53 of each magnitude | size is made into a through-hole. It was assumed that it was filled up with a gap of 1 mm. The area of the first flat plate portion 51 (including the through hole) was assumed to be 100 mm ² .

-Arrangement of vias It was assumed that vias 57 were arranged in the frame portion 55 between the first through holes 53 of the first flat plate portion 51 at intervals of each via shown in Table 1 below.

-Through-hole arrangement | positioning of a 2nd flat plate part About the 2nd flat plate part 59, as shown in following Table 1, the 2nd through-hole 61 of the rectangle (or square) of each magnitude | size is made to straddle the 1st through-hole 53. Assumed to be placed in. The first flat plate portion 51 and the second flat plate portion 53 have the same area (including through holes).

-Gas supply capability calculation The ratio (%) of the total area of the 1st through-hole 53 of the 1st flat plate part 51 with respect to the area of the 1st flat plate part 51 whole was calculated as gas supply capability. The results are shown in Table 1 below.

-Number of vias The number of vias per unit area was calculated. The results are shown in Table 1 below.

  As shown in Table 1, as the through hole area (one area and the total area) of the first flat plate portion 51 increases, the gas supply performance improves, but it can be seen that the number of vias cannot be increased. Experimental examples C and D in which the through-hole area of the second flat plate portion 59 is made smaller than the experimental example B (E) in which the through-hole area of the first flat plate portion 51 and the through-hole area of the second flat plate portion 59 are the same. From (F, G), it can be seen that the number of vias can be increased while maintaining the gas supply capability.

  That is, it can be seen that increasing the through-hole area of the first flat plate portion 51 relative to the through-hole area of the second flat plate portion 59 can increase the gas supply capability and increase the number of vias.

Next, Example 2 will be described with reference to FIG.
This example shows a procedure for manufacturing a 5-layer interconnector (evaluation simple sample) that can be used in the solid oxide fuel cell of the above embodiment.

(1) Preparation of green sheet Zirconia solid solution powder (8YSZ), butyral resin, plasticizer and organic solvent are mixed to prepare a slurry, and the slurry is cast by a doctor blade method to obtain a 200 μm thick zirconia green sheet. Produced.

(2) Preparation of combustible material paste Acrylic organic beads, ethyl cellulose, and an organic solvent were mixed to prepare a combustible material paste.

(3) Fabrication of an unfired interconnector As shown in FIG. 6, a flow path forming through-hole 71 and (in a Pt paste) are formed in a zircore green sheet so as to have the design of Experimental Example D in Table 1 above. Two sheets of first flat plate portions 75 and 77 having unfired vias 73, two sheets of second flat plate portions 79 and 81 having a similar shape, and a central flat plate portion sheet having only vias 73 without through holes. One 83 was prepared.

Next, the combustible material paste was filled in the flow path forming through holes 71 and 85 of the sheets 75, 77, 79 and 81.
Next, the first flat plate portion sheet 75, the second flat plate portion sheet 79, the central flat plate portion sheet 83, the second flat plate portion sheet 81, and the first flat plate portion sheet 77 were laminated in this order.

Next, the laminate was cut into a predetermined dimension along the broken line in FIG.
(4) Firing The unfired interconnector was degreased at 250 ° C. and then fired at 1400 ° C. to form an interconnector.

(5) Evaluation The obtained interconnector was suitable without cracking or warping. Moreover, it has confirmed that the flow path was connected in the surface, ie, the 1st through-hole and the 2nd through-hole connected. Furthermore, it was confirmed that conductivity was secured at the via portion.

  Needless to say, the present invention is not limited to the above-described embodiments, and can be implemented in various modes without departing from the scope of the present invention.

It is a perspective view of the solid oxide fuel cell stack of an embodiment. It is explanatory drawing which fractures | ruptures a part of solid oxide fuel cell stack of embodiment, and expands and is shown typically. It is explanatory drawing which expands and shows a part of AA cross section of FIG. The structure of Experimental Example B of Example 1 is shown, (a) is a plan view of the first flat plate portion, (b) is a plan view of the second flat plate portion, and (c) shows a state in which both flat plate portions are overlapped. It is a top view. The structure of Experimental Example D of Example 1 is shown, (a) is a plan view of the first flat plate portion, (b) is a plan view of the second flat plate portion, and (c) shows a state in which both flat plate portions are overlapped. It is a top view. The manufacturing method of the interconnector of Example 2 is shown, (a) is a top view of the sheet for the 1st flat plate part of the uppermost layer, (b) is a top view of the sheet for the 2nd flat plate part of the 2nd layer, (b). Is a plan view showing a third-layer sheet for the central portion, (d) is a plan view of the fifth-layer first flat plate portion sheet, and (e) is a plan view of the fourth-layer second flat plate portion sheet. is there.

Explanation of symbols

1 ... Solid oxide fuel cell stack 3 ... Solid oxide fuel cell (power generation cell)
DESCRIPTION OF SYMBOLS 5 ... Interconnector 9 ... Solid electrolyte layer 11 ... Air electrode 13 ... Fuel electrode 15 ... Ceramic substrate 17 ... Fuel gas flow path 18 ... Air flow path 19 ... Fuel side 1st flat plate part 21 ... Fuel side 2nd flat plate part 23 ... Central flat plate part 25 ... Air side second flat plate part 27 ... Air side first flat plate part 29 ... Fuel side first through hole 31 ... Fuel side second through hole 33 ... Air side first through hole 35 ... Air side second Through hole

Claims (7)

In a connector having a structure in which a conductive via and a gas flow path are formed in a ceramic member, and ensuring electrical continuity with a power generation cell including an air electrode and a fuel electrode in a solid electrolyte layer,
The first flat plate portion having a plurality of first through holes and the second flat plate portion having a plurality of second through holes are stacked so that the first flat plate portion is on the surface side of the connector,
When the connector is viewed from the front side , each of the plurality of second through holes is disposed so as to straddle the plurality of first through holes ,
In addition, the second through-hole disposed so as to straddle the first through-hole and the first through-hole disposed so as to straddle the second through-hole communicate with each other, and the gas flow the road has been constructed,
Furthermore, the connector total area of all of the first through-hole constituting the gas passage, being greater than the total area of all of the second through-hole constituting the gas passage .   2. The connector according to claim 1, wherein a total area of the first through holes is twice or more a total area of the second through holes.   The connector according to claim 1 or 2, wherein an area of the first through hole is larger than an area of the second through hole.   4. The connector according to claim 3, wherein an area of the first through hole is at least twice as large as an area of the second through hole. 5.   The connector according to claim 1, wherein the connector is integrally fired.   The connector is an interconnector that electrically connects the power generation cells and separates a gas flow path of the oxidant gas that contacts the air electrode and a gas flow path of the fuel gas that contacts the fuel electrode. The connector according to claim 1, wherein the connector is characterized in that   A solid oxide fuel cell, wherein the connector according to any one of claims 1 to 6 and a power generation cell including a solid electrolyte layer, an air electrode, and a fuel electrode are integrally fired. .

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