WO2024004062A1 - Solid oxide fuel battery - Google Patents

Solid oxide fuel battery Download PDF

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Publication number
WO2024004062A1
WO2024004062A1 PCT/JP2022/025857 JP2022025857W WO2024004062A1 WO 2024004062 A1 WO2024004062 A1 WO 2024004062A1 JP 2022025857 W JP2022025857 W JP 2022025857W WO 2024004062 A1 WO2024004062 A1 WO 2024004062A1
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WO
WIPO (PCT)
Prior art keywords
oxide fuel
solid oxide
metal support
fuel cell
support layer
Prior art date
Application number
PCT/JP2022/025857
Other languages
French (fr)
Japanese (ja)
Inventor
敬士 市原
利春 大和
Original Assignee
日産自動車株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 日産自動車株式会社 filed Critical 日産自動車株式会社
Priority to PCT/JP2022/025857 priority Critical patent/WO2024004062A1/en
Publication of WO2024004062A1 publication Critical patent/WO2024004062A1/en

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/86—Inert electrodes with catalytic activity, e.g. for fuel cells
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M8/00—Fuel cells; Manufacture thereof
    • H01M8/02—Details
    • H01M8/0271—Sealing or supporting means around electrodes, matrices or membranes
    • H01M8/0273—Sealing or supporting means around electrodes, matrices or membranes with sealing or supporting means in the form of a frame
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M8/00—Fuel cells; Manufacture thereof
    • H01M8/10—Fuel cells with solid electrolytes
    • H01M8/12—Fuel cells with solid electrolytes operating at high temperature, e.g. with stabilised ZrO2 electrolyte
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M8/00—Fuel cells; Manufacture thereof
    • H01M8/10—Fuel cells with solid electrolytes
    • H01M8/12—Fuel cells with solid electrolytes operating at high temperature, e.g. with stabilised ZrO2 electrolyte
    • H01M8/1213—Fuel cells with solid electrolytes operating at high temperature, e.g. with stabilised ZrO2 electrolyte characterised by the electrode/electrolyte combination or the supporting material
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/30—Hydrogen technology
    • Y02E60/50—Fuel cells

Definitions

  • the present invention relates to solid oxide fuel cells.
  • SOFC solid oxide fuel cell
  • US2011-0104586A1 discloses a solid oxide fuel cell with a porous metal support.
  • the density of a part of the metal support is increased, and the sealing member is surface-bonded to the high-density part of the metal support, thereby preventing gas leakage from the metal support. Prevents gas leaks from between the frame and the frame.
  • the present invention has been made in view of the above problems, and an object of the present invention is to provide a solid oxide fuel cell in which the airtightness of the power generation cell is ensured.
  • the first electrode layer, the solid electrolyte layer stacked on the first electrode layer, the second electrode layer stacked on the solid electrolyte layer, and the first electrode layer are supported.
  • a solid oxide fuel cell is provided in which a plurality of power generation cells each including a porous metal support layer are stacked.
  • This solid oxide fuel cell includes a metal frame provided under a porous metal support layer, and the porous metal support layer has a filling part, which is an area where the pores are filled with a filler, formed in the porous metal support layer. It is provided on the outer periphery of the metal support layer.
  • the metal frame is joined to the filling part of the porous metal support layer via a joint, and the joint includes a first joint formed along the outer periphery of the porous metal support layer, and a first joint.
  • the first joint part includes a second joint part disposed at a distance from the first joint part on the outer peripheral side.
  • FIG. 1 is an exploded perspective view of a solid oxide fuel cell according to a first embodiment of the present invention.
  • FIG. 2 is an exploded perspective view of the cell unit.
  • FIG. 3 is an enlarged schematic diagram of the joint portion between the power generation cell and the frame.
  • FIG. 4 is a cross-sectional view of the porous metal support layer.
  • FIG. 5 is an enlarged schematic diagram of a joint portion between a power generation cell and a frame according to a modified example.
  • FIG. 6 is a cross-sectional view of a porous metal support layer in a solid oxide fuel cell according to a first modification of the first embodiment.
  • FIG. 7 is a cross-sectional view of a porous metal support layer in a solid oxide fuel cell according to another modification.
  • FIG. 1 is an exploded perspective view of a solid oxide fuel cell according to a first embodiment of the present invention.
  • FIG. 2 is an exploded perspective view of the cell unit.
  • FIG. 3 is an enlarged schematic diagram of the joint portion between
  • FIG. 8 is a cross-sectional view of a porous metal support layer in a solid oxide fuel cell according to a second modification of the first embodiment.
  • FIG. 9 is a cross-sectional view of a porous metal support layer in a solid oxide fuel cell according to a third modification of the first embodiment.
  • FIG. 10 is a cross-sectional view of a porous metal support layer in a solid oxide fuel cell according to another modification.
  • FIG. 11 is a cross-sectional view of a porous metal support layer in a solid oxide fuel cell according to a fourth modification of the first embodiment.
  • FIG. 12 is a cross-sectional view of a porous metal support layer in a solid oxide fuel cell according to another modification.
  • FIG. 13 is a cross-sectional view of a porous metal support layer in a solid oxide fuel cell according to another modification.
  • FIG. 14 is an enlarged schematic diagram of the joint portion between the power generating cell and the frame in the solid oxide fuel cell according to the second embodiment.
  • FIG. 15 is an enlarged schematic diagram of a joint portion between a power generation cell and a frame in a solid oxide fuel cell according to a third embodiment.
  • FIG. 16 is a cross-sectional view of a porous metal support layer in a solid oxide fuel cell according to a third embodiment.
  • FIG. 1 is an exploded perspective view showing a solid oxide fuel cell 100 (hereinafter also simply referred to as a "fuel cell”) according to a first embodiment of the present invention.
  • the solid oxide fuel cell 100 is constructed by stacking a plurality of cell units 1 in the vertical direction. Note that, although the solid oxide fuel cell 100 of this embodiment is mainly mounted on a vehicle or the like, it is not limited thereto.
  • FIG. 2 is an exploded perspective view of the cell unit 1 that constitutes the solid oxide fuel cell 100.
  • the cell unit 1 includes a power generation cell 2, a frame 3, an anode flow path forming member 4, a cathode flow path forming member 5, a separator 6, an anode spacer 41, a cathode spacer 51, and the like.
  • the power generation cell 2 is constituted by a membrane electrode assembly in which an anode electrode layer (first electrode layer) is arranged on one surface of a solid electrolyte layer and a cathode electrode layer (second electrode layer) is arranged on the other surface.
  • the lower surface side of the power generation cell 2 is an anode electrode layer
  • the upper surface side is a cathode electrode layer.
  • Anode gas (fuel gas) and cathode gas (air) are supplied to the power generation cell 2, and the power generation cell 2 generates power based on electrode reactions in the anode electrode layer and the cathode electrode layer.
  • the power generation cell 2 includes a porous metal support layer that supports the electrode layer. That is, the solid oxide fuel cell 100 of this embodiment is a so-called metal support type fuel cell.
  • the power generation cell 2 has its peripheral edge joined and supported by a frame (frame body) 3 made of metal provided below the power generation cell 2, whereby the power generation cell 2 is connected to the frame (metal frame) 3. is fixed.
  • the frame 3 has a plurality of protrusions extending from the outer periphery, and holes 31 are formed in the protrusions.
  • the anode flow path forming member 4 is made of a conductive material such as metal, and is disposed between the anode electrode layer of the power generation cell 2 and a separator 6, which will be described later, and allows fuel gas to flow toward the anode electrode layer side of the power generation cell 2. Form an anode flow path.
  • the anode flow path forming member 4 is formed into a so-called wavy shape in which unevenness extending linearly in the width direction of the power generation cell 2 is repeatedly provided in the longitudinal direction. Thereby, a plurality of anode channels are defined between the anode electrode layer of the power generation cell 2 and the separator 6.
  • the cathode flow path forming member 5 is made of a conductive material such as metal, and is arranged between the cathode electrode layer of the power generation cell 2 and the separator 6 (of the adjacent cell unit 1), and is located on the cathode electrode layer side of the power generation cell 2.
  • a cathode flow path is formed through which cathode gas (air) flows.
  • the cathode flow path forming member 5 is formed in a wavy shape, and a plurality of cathode flow paths are defined between the cathode electrode layer of the power generation cell 2 and the separator 6.
  • the anode flow path forming member 4 forming the anode flow path and the cathode flow path forming member 5 forming the cathode flow path are each divided into two parts and separated from each other. Not limited. For example, two divided flow path members may be arranged close to each other without leaving a gap. Alternatively, the anode channel and the cathode channel may each be formed by one member.
  • the separator 6 is an electrically conductive plate-like member, and one surface (upper surface) is electrically bonded to the anode channel forming member 4. Thereby, the separator 6 and the anode electrode of the power generation cell 2 are electrically connected via the anode flow path forming member 4. On the other hand, the other surface (lower surface) of the separator 6 is joined to the cathode channel forming member 5 of the adjacent cell unit 1.
  • the separator 6 has a plurality of protrusions extending and protruding from the outer peripheral edge, and a hole 61 is formed in the protrusion at a position corresponding to the hole 31 of the frame 3.
  • the holes 61 of the separator 6 and the holes 31 of the frame 3 overlap to form holes through which fuel gas is supplied to the anode flow path and holes through which fuel gas exits from the anode flow path.
  • a sealing member 11 is provided around a hole formed by overlapping the hole 61 of the separator 6 and the hole 31 of the frame 3.
  • the anode spacer 41 is a frame layered on the outer periphery of the separator 6, and is arranged between the power generation cell 2 and the separator 6 to ensure the height of the anode flow path.
  • the anode spacer 41 is arranged so that its outer shape overlaps the frame 3 and the separator 6 to which the power generation cell 2 is fixed.
  • the cathode spacers 51 are arranged at both longitudinal ends of the cathode flow path forming member 5 to ensure the height of the cathode flow path and sealing both longitudinal ends of the cathode flow path forming member 5.
  • fuel gas anode gas
  • cathode flow path to the cathode electrode layer side of the power generation cell 2.
  • Air cathode gas
  • a frame is generally assembled under the power generation cell and a seal is formed between the power generation cell and the frame to prevent gas leakage.
  • the power generation cell includes a porous metal support layer that supports electrodes, even if the frame provided under the metal support layer and the metal support layer are sealed, the porous There is a risk of gas leaking from the sides of the metal support layer.
  • the power generation cell it is possible to prevent gas leaks from the sides and between the power generation cells and the frame.
  • the frame and power generation cell are made thinner in order to reduce size and weight, the power generation cell (metal support layer) will be easily deformed due to gas pressure difference and heating, and there is a risk that the seal portion may peel off. . That is, there is still a possibility that gas leakage may occur.
  • a filling part which is a region where pores are filled with a filling material, is provided on the outer peripheral part of the porous metal support layer that supports the electrode layer, and the frame 3 is connected to the two joint parts. It was decided that it would be joined to the filling part through the insulator. Specifically, a first bonding portion is formed along the outer periphery of the porous metal support layer, and a second bonding portion is disposed on the outer periphery side of the first bonding portion and spaced apart from the first bonding portion. The frame 3 is joined to the filling part by the joint part.
  • FIG. 3 is an enlarged schematic diagram of the joint portion between the power generation cell 2 and the frame 3, and is a sectional view taken along the line AA in FIG. 2.
  • the power generation cell 2 includes a solid electrolyte layer 21, an anode electrode layer (first electrode layer) 22 disposed on one surface of the solid electrolyte layer 21, and an anode electrode layer (first electrode layer) 22 disposed on one surface of the solid electrolyte layer 21.
  • a porous metal support layer (metal support, hereinafter also simply referred to as metal support layer) 24 that supports the anode electrode layer 22 is included.
  • the solid electrolyte layer 21 is formed of a dense ceramic layer.
  • ceramics refers to sintered bodies of inorganic substances, and is a concept that includes not only nonmetal oxides but also metal oxides.
  • the solid electrolyte layer 21 may be configured to be able to conduct oxide ions but not allow gas to pass therethrough.
  • the solid electrolyte layer 21 can be formed of solid oxide ceramics.
  • Solid oxide ceramics are not particularly limited, but include, for example, zirconia-containing materials. Examples of the zirconia-containing material include stabilized zirconia doped with yttria, neodymium oxide, samarium, gadolinium, scandium, and the like.
  • the anode electrode layer 22 has a porous structure and is formed of, for example, a metal such as nickel (Ni) and an oxide such as yttria-stabilized zirconia (YSZ), but is not limited to these and may be formed of any known material. May be used.
  • a metal such as nickel (Ni) and an oxide such as yttria-stabilized zirconia (YSZ), but is not limited to these and may be formed of any known material. May be used.
  • the cathode electrode layer 23 has a porous structure and is formed of, for example, lanthanum strontium cobalt composite oxide (LSC), lanthanum strontium cobalt iron oxide (LSCF), etc., but is not limited to these, and may be made of any known material. may also be used.
  • LSC lanthanum strontium cobalt composite oxide
  • LSCF lanthanum strontium cobalt iron oxide
  • the metal support layer 24 has a porous structure and is formed of, for example, ferritic stainless steel, but is not limited to this, and any known material may be used.
  • the metal support layer 24 is provided to support the anode electrode layer 22 and functions as a structural member for reinforcing the strength of the power generation cell 2.
  • the metal support layer 24 has a filled part 241, which is a region in which pores are filled with a filler, and a porous part 242, which is a region not filled with a filler.
  • the filling portion 241 is formed on the outer periphery of the metal support layer 24 .
  • the filling material filled in the filling part 241 is made of an insulating material with a coefficient of linear expansion smaller than that of the material forming the metal support layer 24, such as alumina, zirconia (ZrO 2 ), yttria-stabilized zirconia (YSZ), etc. ), scandia-stabilized zirconia (ScSZ), and the like can be used.
  • a metal frame 3 that supports and fixes the power generation cell 2 is provided below the metal support layer 24.
  • the metal support layer 24 includes a first joint 71 disposed on the inner circumference side of the filling part 241, and a first joint part 71 disposed on the outer circumference side of the filler part 241 at a distance from the first joint part 71.
  • a second joint portion 72 is formed.
  • the frame 3 is welded (joined) to the metal support layer 24 at a first joint 71 and a second joint 72 .
  • the average particle size of the filler filled in the pores is smaller than the average pore size of the core pores of the metal support layer 24. Thereby, the metal support layer 24 can be densely filled with the filler.
  • the filler is also filled in the space (gap) S surrounded by the first joint 71, the second joint 72, the metal support layer 24, and the frame 3. This further improves the airtightness between the filling part 241 and the frame 3.
  • the metal support layer 24 and the frame 3 may be joined without any gap (that is, without any space S).
  • the filler has a smaller coefficient of linear expansion than the material constituting the metal support layer 24, so even if the filler thermally expands at high temperatures, the metal support layer 24 will not be pushed. That is, the metal support layer 24 is prevented from being pushed and damaged due to thermal expansion of the filler.
  • the filler is made of an insulating material, even if the filler leaks from the side surface of the metal support layer 24 and connects to the electrode layer, no short circuit occurs.
  • the filler is filled from the side surface of the metal support layer 24.
  • the pores on the outer peripheral side of the metal support layer 24 can be reliably filled, and gas leaks from the side surfaces of the metal support layer 24 can be more reliably prevented.
  • the filler by filling the metal support layer 24 with the filler after welding, it is possible to prevent quality deterioration caused by welding the metal support layer 24 with the insulating material (filler) mixed therein.
  • FIG. 4 is a cross-sectional view of the entire metal support layer 24 along line BB in FIG. 3.
  • the first joint portion 71 where the frame 3 and the metal support layer 24 are joined is located along the outer periphery (filling portion 241) of the metal support layer 24 when viewed in the stacking direction of the cell unit 1. It is formed continuously over the entire circumference on one annular line (first annular line 32).
  • the second joint portion 72 where the frame 3 and the metal support layer 24 are joined is located at the outer periphery of the metal support layer 24 ( It is formed continuously over the entire circumference on a line (second annular line 33) that forms one annular shape along the filling portion 241).
  • the frame 3 has the first joint 71 formed along the outer periphery of the metal support layer 24 and the first joint 71 located on the outer periphery side of the first joint 71 and spaced apart from the first joint 71 . It is joined to the filling part 241 of the metal support layer 24 via the disposed second joint part 72 . Since the frame 3 and the filling part 241 are joined by the two joining parts 71 and 72, displacement (deformation) of the filling part 241 due to gas pressure difference, heating, etc. is suppressed, and the filling part 241 and the frame 3 are separated. This will be prevented. That is, gas leakage between the metal support layer 24 and the frame 3 can be prevented.
  • the filling portion 241 formed on the outer periphery of the metal support layer 24 prevents gas leakage from the side surface of the metal support layer 24, and the first joint portion is formed along the outer periphery of the metal support layer 24. 71 and the second joint 72 prevent gas leakage between the metal support layer 24 and the frame 3. Therefore, the airtightness of the power generation cell 2 is ensured, and a decrease in power generation performance is prevented.
  • the power generation cell 2 includes a porous metal support layer 24 that supports an anode electrode layer 22 (first electrode layer), and the porous metal support layer 24 has a filler on its outer periphery. It has a filling part 241 which is a region filled with pores. Moreover, the metal frame 3 provided under the porous metal support layer 24 is joined to the filling part 241 of the porous metal support layer 24 via a joint.
  • the bonding portion includes a first bonding portion 71 formed along the outer periphery of the porous metal support layer 24 and a spaced apart from the first bonding portion 71 on the outer circumferential side of the first bonding portion 71 . and a second joint portion 72 arranged therein.
  • the solid oxide fuel cell 100 has first and second joint parts 71 and 72 that join the metal frame 3 and the porous metal support layer 24, and the first joint part 71 has porous
  • the second bonding portion 72 is disposed on the first annular line 32 that is annular along the outer periphery of the solid metal support layer 24
  • the second joint 72 is disposed on the second annular line 32 that is located on the outer periphery of the first annular line 32 . It is arranged on the circular line 33.
  • the solid oxide fuel cell 100 has first and second joint parts 71 and 72 that join the metal frame 3 and the porous metal support layer 24 , and the first joint part 71 connects the porous metal support layer 24 to the first joint part 71 , 72 .
  • the second joint part 72 is continuously provided on the first annular line 32 along the outer periphery of the first annular line 32, and the second joint part 72 is continuously provided on the second annular line 33 located on the outer periphery of the first annular line 32. Continuously placed around the circumference. As a result, displacement (deformation) of the filling part 241 due to gas pressure difference, heating, etc. is suppressed over the entire outer circumference of the porous metal support layer 24, and separation of the filling part 241 and the frame 3 is further prevented. be done.
  • the porous metal support layer 24 has a filling part 241 in which pores are filled with a filler in the outer peripheral part, and the linear expansion coefficient of the filler is equal to that of the porous metal support. It is smaller than the linear expansion coefficient of the porous metal material that constitutes the layer 24. This prevents the metal support layer 24 from being pushed and damaged due to thermal expansion of the filler.
  • the lower surface side of the power generation cell 2 is the anode electrode layer (first electrode layer), and the upper surface side is the cathode electrode layer (second electrode layer), but this is not necessarily the case.
  • the lower surface side may be used as a cathode electrode layer, and the upper surface side may be used as an anode electrode layer.
  • the metal support layer 24 is provided on the anode electrode layer 22 side, but the structure is not necessarily limited to this. That is, it is sufficient that the metal support layer 24 is provided on at least one electrode side, and the metal support layer 24 and the metal frame 3 are bonded.
  • FIG. 2 the configurations of the anode flow path, cathode flow path, etc. described in FIG. 2 are merely examples, and are not particularly limited thereto.
  • the first joint portion 71 is formed at a certain position of the filling portion 241, but the first joint portion 71 is not necessarily limited to this.
  • the first joint portion 71 may be formed across the filling portion 241 and the porous portion 242, or may be formed in the porous portion 242 near the filling portion 241.
  • the metal frame 3 is joined to the porous metal support layer 24 by welding, but the joining method is not necessarily limited to this.
  • the metal frame 3 may be joined to the porous metal support layer 24 by brazing.
  • the metal support layer 24 is filled with a filler to form the filling portion 241 in the metal support layer 24, but the present invention is not necessarily limited to this.
  • the metal support layer 24 not only the metal support layer 24 but also the electrode layer (anode electrode layer 22) laminated on the metal support layer 24 may be filled with the filler to form a filling portion in the electrode layer as well.
  • the electrode layer is much thinner than the metal support layer 24, gas leakage can be prevented even with the configuration of this embodiment in which the filling portion 241 is formed only in the metal support layer 24.
  • a solid oxide fuel cell 100 according to a first modification of the first embodiment will be described with reference to FIG. 6.
  • This embodiment differs from the first embodiment in that the second joint portion 72 is formed discontinuously. Note that the same elements as in the first embodiment are denoted by the same reference numerals, and the description thereof will be omitted.
  • FIG. 6 is a sectional view of the porous metal support layer 24 in the solid oxide fuel cell 100 according to this modification, and corresponds to a sectional view of the entire metal support layer 24 along line BB in FIG. 3.
  • the second joint portions 72 are arranged discontinuously on the second annular line 33. Specifically, the second joint portions 72 are arranged in a dotted line shape with intervals. That is, the frame 3 is welded to the metal support layer 24 in a dotted line shape at the second joint portion 72 on the second annular line 33 . This suppresses deformation of the metal support layer 24 due to thermal strain during welding, compared to the case where the second joint portions 72 are formed continuously. Therefore, the airtightness of the power generation cell 2 is strengthened, and gas leakage between the porous metal support layer 24 and the metal frame 3 is further prevented.
  • the second joint portions 72 are arranged in a dotted line shape with intervals, but the arrangement is not necessarily limited to this.
  • the porous metal support layer 24 in FIG. It may be provided so as to extend in a direction perpendicular to the other direction. Also in such a configuration, deformation of the metal support layer 24 due to thermal strain during welding is suppressed.
  • a solid oxide fuel cell 100 according to a second modification of the first embodiment will be described with reference to FIG. 8.
  • This embodiment differs from other embodiments in that the first joint portion 71 is formed discontinuously. Note that the same elements as in other embodiments are denoted by the same reference numerals, and the explanation thereof will be omitted.
  • FIG. 8 is a sectional view of the porous metal support layer 24 in the solid oxide fuel cell 100 according to this modification, and corresponds to a sectional view of the entire metal support layer 24 along line BB in FIG. 3.
  • the first joint portions 71 are arranged discontinuously on the first annular line 32. Specifically, the first joint portions 71 are arranged in a dotted line shape with intervals. That is, the frame 3 is welded to the metal support layer 24 in a dotted line shape at the first joint 71 on the first annular line 32 .
  • the second joint portions 72 are also arranged in a dotted line shape with intervals, similar to the first modification of the first embodiment. That is, the frame 3 is welded to the metal support layer 24 in a dotted line shape at the second joint portion 72 on the second annular line 33 .
  • first joint portion 71 and the second joint portion 72 are arranged in a staggered manner when viewed in the stacking direction of the cell unit 1 so that the portions where the joint portions are interrupted do not overlap. That is, the first bonding portion 71 and the second bonding portion 72 are arranged such that the bonding portion exists at least on either the outer circumferential side or the inner circumferential side of the filling portion 241 of the metal support layer 24 when viewed in the stacking direction. It is located.
  • first joint portion 71 and the second joint portion 72 are arranged in a staggered manner so that the joint portion exists at least on either the outer circumferential side or the inner circumferential side of the filling portion 241 of the metal support layer 24 when viewed in the stacking direction. Since the filling portion 241 is disposed in the same direction, displacement of the filling portion 241 due to gas pressure difference or heating is suppressed. Therefore, the airtightness of the power generation cell 2 is strengthened, and gas leakage between the porous metal support layer 24 and the metal frame 3 is further prevented.
  • both the first joint portion 71 and the second joint portion 72 are arranged in a dotted line shape with an interval between them, but this is not necessarily the case.
  • the second joint portion 72 may be arranged in a dotted line shape, and the second joint portion 72 may be continuously provided on the second annular line 33 over the entire circumference.
  • the first joint portions 71 are arranged in a dotted line shape with intervals, and a plurality of second joint portions 72 are arranged at intervals on the second annular line 33, and on the first annular line 32. It may be provided so as to extend in a direction perpendicular to the other direction. Even with such a configuration, deformation of the metal support layer 24 due to thermal strain during welding is suppressed.
  • a solid oxide fuel cell 100 according to a third modification of the first embodiment will be described with reference to FIG. 9.
  • This embodiment differs from other embodiments in that the first joint portion 71 is formed discontinuously at the corner. Note that the same elements as in other embodiments are denoted by the same reference numerals, and the explanation thereof will be omitted.
  • FIG. 9 is a sectional view of the porous metal support layer 24 in the solid oxide fuel cell 100 according to this modification, and corresponds to a sectional view of the entire metal support layer 24 along line BB in FIG. 3.
  • the first joint portion 71 is arranged on the first annular line 32 so that the corner portions are discontinuous. That is, the frame 3 is not joined to the metal support layer 24 at the corners of the first annular wire 32 . Normally, if there is a bending part in the joint part, joining work (welding etc.) becomes difficult, but in this modification, since there is no bending part in the first joint part 71, the frame 3 and the metal support layer 24 are Joining (welding, etc.) becomes easier.
  • the second joint portions 72 are arranged in a dotted line shape with intervals, but the arrangement is not limited thereto.
  • the second joint portions 72 may be arranged continuously over the entire circumference on the second annular line 33, or as shown in FIG. 10, the second joint portions 72 may be arranged at intervals, A plurality of them may be arranged so as to extend in a direction perpendicular to the first annular line 32.
  • a solid oxide fuel cell 100 according to a fourth modification of the first embodiment will be described with reference to FIG. 11.
  • This embodiment differs from the third modification of the first embodiment in that the second joint 72 includes a diagonal joint 721 formed to extend diagonally at a corner. Note that the same elements as in other embodiments are denoted by the same reference numerals, and the explanation thereof will be omitted.
  • FIG. 11 is a cross-sectional view of the porous metal support layer 24 in the solid oxide fuel cell 100 according to this modification.
  • the first joint 71 is disposed on the first annular line 32 so that the corner is discontinuous
  • the second joint 72 is disposed on the second annular line 32. They are arranged in a dotted line shape on the line 33.
  • the second joint portion 72 has a diagonal joint portion 721 formed to extend diagonally at the corner of the second annular line 33 .
  • the airtightness of the power generation cell 2 is strengthened, and gas leakage between the porous metal support layer 24 and the metal frame 3 is further prevented. Moreover, since there is no bending part in either the first joint part 71 or the second joint part 72, the joining (welding, etc.) between the frame 3 and the metal support layer 24 becomes easy.
  • the second joint parts 72 are arranged in a dotted line shape with intervals, but the invention is not limited to this.
  • the invention may be formed only from diagonal joints 721 that are formed to extend diagonally at the corners of the annular wire 33.
  • the shapes of the joint portions described in the first embodiment and the first to fourth modifications of the first embodiment are each described as a single embodiment, they may be combined as appropriate. That is, the first and second joints 71 and 72 may have any shape, such as a continuous shape over the entire circumference, a dotted line shape with intervals, a shape extending in the vertical direction, or a shape with discontinuous corners. The combination may be arbitrary. Furthermore, the first and second joints 71 and 72 may have different shapes in the longitudinal direction and the lateral direction of the metal support layer 24. For example, as shown in FIG.
  • a plurality of second joint portions 72 are arranged at intervals in the longitudinal direction of the metal support layer 24 and extend in a direction perpendicular to the first annular line 32, and They may be arranged in a dotted line shape with intervals in the direction.
  • a solid oxide fuel cell 100 according to a second embodiment will be described with reference to FIG. 14.
  • This embodiment differs from the first embodiment in that the first joint 71 and the second joint 72 have different welding depths. Note that the same elements as in the first embodiment are denoted by the same reference numerals, and the description thereof will be omitted.
  • FIG. 14 is an enlarged schematic diagram of the joint portion between the power generation cell 2 and the frame 3, and corresponds to a cross-sectional view taken along line AA in FIG. 2.
  • the frame 3 is welded to the metal support layer 24 at a first joint 71 on the inner peripheral side and a second joint 72 on the outer peripheral side of the filling part 241.
  • the welding depth (penetration depth) at the first joint portion 71 is larger than the welding depth (penetration depth) at the second joint portion 72 by H.
  • the second joint 72 prevents the filling of the filler. This prevents interference and makes it easier to fill the metal support layer 24 with the filler from the side surface.
  • the welding depth of the first joint part 71 on the inner peripheral side is made larger, the first joint part 71 suppresses the filler from entering the central part of the power generation cell 2. That is, the insulating filler is prevented from entering the center of the power generation cell 2 and reducing the area of the active area (portion that contributes to power generation) of the power generation cell 2.
  • the metal frame 3 is welded to the porous metal support layer 24 at a first joint 71 and a second joint 72 disposed on the outer peripheral side of the first joint 71.
  • the welding depth at the first joint 71 is greater than the welding depth at the second joint 72. In this way, since the welding depth of the second joint part 72 on the outer circumferential side is made smaller, it becomes easier to fill the filler from the side surface of the porous metal support layer 24, and the filling part 241 is more reliably filled. It can be done.
  • the welding depth of the first joint 71 on the inner peripheral side is made larger, the intrusion of the filler material into the center of the power generation cell 2 is suppressed, and the area of the active area of the power generation cell 2 is reduced. can be suppressed.
  • a solid oxide fuel cell 100 according to a third embodiment will be described with reference to FIGS. 15 and 16.
  • This embodiment differs from other embodiments in that the metal frame 3 has an opening 34. Note that the same elements as in other embodiments are denoted by the same reference numerals, and the explanation thereof will be omitted.
  • FIG. 15 is an enlarged schematic diagram of the joint portion between the power generation cell 2 and the frame 3, and corresponds to a cross-sectional view taken along the line AA in FIG. 2. Further, FIG. 16 is a cross-sectional view of the entire porous metal support layer 24 along line CC in FIG. 15.
  • the frame 3 is welded to the metal support layer 24 at a first joint 71 on the inner peripheral side and a second joint 72 on the outer peripheral side of the filling part 241. Further, the frame 3 has a plurality of openings 34 opened downward between the first joint 71 and the second joint 72.
  • the frame 3 has the opening 34 between the first joint part 71 and the second joint part 72, when the filler is filled from the side surface of the metal support layer 24, the first When the entire metal support layer 24 (namely, the filling portion 241) between the bonding portion 71 and the second bonding portion 72 is filled with the filler, the filler reaches the opening 34. That is, it can be confirmed from the opening 34 that the filler has been filled between the first joint 71 and the second joint 72. Therefore, the filling portion 241 can be filled more reliably.
  • the welding depth at the first joint 71 is preferably greater than the welding depth at the second joint 72, but is not necessarily limited to this.
  • the welding depths of the first joint portion 71 and the second joint portion 72 may be the same.
  • the metal frame 3 has an opening 34 between the first joint 71 and the second joint 72. Thereby, it can be confirmed from the opening 34 that the filler is filled between the first joint part 71 and the second joint part 72, and the filling part 241 can be filled more reliably. . That is, gas leakage from the side surfaces of the metal support layer 24 can be further prevented.

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Abstract

Provided is a solid oxide fuel battery formed by laminating a plurality of power generation cells that are each composed of a first electrode layer, a solid electrolyte layer laminated on the first electrode layer, a second electrode layer laminated on the solid electrolyte layer, and a porous metal support layer for supporting the first electrode layer. This solid oxide fuel battery is provided with a metal frame provided below the porous metal support layer. The porous metal support layer has a filled part, which is a region where pores are filled with a filling material, at the outer peripheral part of the porous metal support layer. The metal frame is joined to the filled part of the porous metal support layer through joining parts. The joining parts include a first joining part formed so as to be along the outer peripheral part of the porous metal support layer, and a second joining part that is disposed to be spaced apart from the first joining part on the outer peripheral side as compared to the first joining part.

Description

固体酸化物形燃料電池solid oxide fuel cell
　本発明は、固体酸化物形燃料電池に関する。 The present invention relates to solid oxide fuel cells.
　平板型の発電セルを備える固体酸化物形燃料電池（ＳＯＦＣ）では、一般的に、発電セルの下に、ガス供給用のマニホールドを形成するフレームを組み付け、気密性を保つために発電セルとフレーム間をシールする。 In a solid oxide fuel cell (SOFC) equipped with a flat power generation cell, a frame that forms a gas supply manifold is generally assembled below the power generation cell, and the power generation cell and frame are assembled to maintain airtightness. Seal between.
　しかしながら、発電セルが電極を支持する多孔質の金属支持層を備えるＳＯＦＣにおいては、金属支持層の下に設けられたフレームと金属支持層の間をシールしても、金属支持層の側面からガスがリークする虞がある。 However, in a SOFC in which the power generation cell has a porous metal support layer that supports the electrodes, even if the frame provided below the metal support layer and the metal support layer are sealed, gas cannot be removed from the side of the metal support layer. There is a risk of leakage.
　一方、発電セルにおける緻密な電解質面にフレームを接合する場合、発電セルの側面からのガスリークは防止されるが、電解質面とフレームとの接合境界において電解質にクラックが発生しやすくなり、発電性能が低下する虞がある。 On the other hand, when a frame is bonded to the dense electrolyte surface of a power generation cell, gas leakage from the side of the power generation cell is prevented, but cracks are likely to occur in the electrolyte at the bonding boundary between the electrolyte surface and the frame, which reduces power generation performance. There is a risk that it will decline.
　ＵＳ２０１１－０１０４５８６Ａ１には、多孔質の金属支持体を備える固体酸化物燃料セルが開示されている。この固体酸化物燃料セルでは、金属支持体の一部の密度を高くして、金属支持体における密度の高い部分にシール部材を面接合させることで、金属支持体からのガスリーク及び金属支持体とフレームとの間からのガスリークを防止している。 US2011-0104586A1 discloses a solid oxide fuel cell with a porous metal support. In this solid oxide fuel cell, the density of a part of the metal support is increased, and the sealing member is surface-bonded to the high-density part of the metal support, thereby preventing gas leakage from the metal support. Prevents gas leaks from between the frame and the frame.
　ＵＳ２０１１－０１０４５８６Ａ１に記載の固体酸化物燃料セルでは、小型化、軽量化のためにフレームや発電セルを薄くすると、ガス差圧や加熱により、発電セル（金属支持体）が変形しやすくなり、シール部が剥離しやすくなる。即ち、依然として発電セルからフレームまでの間の気密性を確保できなくなる虞がある。 In the solid oxide fuel cell described in US2011-0104586A1, when the frame and power generation cell are made thinner in order to reduce size and weight, the power generation cell (metal support) becomes easily deformed due to gas differential pressure and heating, and the seal parts may peel off easily. That is, there is still a possibility that airtightness between the power generation cells and the frame cannot be ensured.
　本発明は上記課題に鑑みたものであり、発電セルの気密性を確保した固体酸化物形燃料電池を提供することを目的とする。 The present invention has been made in view of the above problems, and an object of the present invention is to provide a solid oxide fuel cell in which the airtightness of the power generation cell is ensured.
　本発明の一態様によれば、第１電極層と、第１電極層上に積層された固体電解質層と、固体電解質層上に積層された第２電極層と、第１電極層を支持する多孔質金属支持層とからなる発電セルが複数積層された固体酸化物形燃料電池が提供される。この固体酸化物形燃料電池は、多孔質金属支持層の下に設けられた金属フレームを備え、多孔質金属支持層は、充填材により空孔が充填されている領域である充填部を当該多孔質金属支持層の外周部に有している。金属フレームは、接合部を介して多孔質金属支持層の充填部に接合され、接合部は、多孔質金属支持層の外周部に沿うように形成される第１接合部と、第１接合部よりも外周側に、第１接合部と間隔を置いて配置された第２接合部とを含む。 According to one aspect of the present invention, the first electrode layer, the solid electrolyte layer stacked on the first electrode layer, the second electrode layer stacked on the solid electrolyte layer, and the first electrode layer are supported. A solid oxide fuel cell is provided in which a plurality of power generation cells each including a porous metal support layer are stacked. This solid oxide fuel cell includes a metal frame provided under a porous metal support layer, and the porous metal support layer has a filling part, which is an area where the pores are filled with a filler, formed in the porous metal support layer. It is provided on the outer periphery of the metal support layer. The metal frame is joined to the filling part of the porous metal support layer via a joint, and the joint includes a first joint formed along the outer periphery of the porous metal support layer, and a first joint. The first joint part includes a second joint part disposed at a distance from the first joint part on the outer peripheral side.
図１は、本発明の第１実施形態による固体酸化物形燃料電池の分解斜視図である。FIG. 1 is an exploded perspective view of a solid oxide fuel cell according to a first embodiment of the present invention. 図２は、セルユニットの分解斜視図である。FIG. 2 is an exploded perspective view of the cell unit. 図３は、発電セルとフレームの接合部分の拡大模式図である。FIG. 3 is an enlarged schematic diagram of the joint portion between the power generation cell and the frame. 図４は、多孔質金属支持層の断面図である。FIG. 4 is a cross-sectional view of the porous metal support layer. 図５は、変形例による発電セルとフレームの接合部分の拡大模式図である。FIG. 5 is an enlarged schematic diagram of a joint portion between a power generation cell and a frame according to a modified example. 図６は、第１実施形態の第１変形例による固体酸化物形燃料電池における多孔質金属支持層の断面図である。FIG. 6 is a cross-sectional view of a porous metal support layer in a solid oxide fuel cell according to a first modification of the first embodiment. 図７は、その他の変形例による固体酸化物形燃料電池における多孔質金属支持層の断面図である。FIG. 7 is a cross-sectional view of a porous metal support layer in a solid oxide fuel cell according to another modification. 図８は、第１実施形態の第２変形例による固体酸化物形燃料電池における多孔質金属支持層の断面図である。FIG. 8 is a cross-sectional view of a porous metal support layer in a solid oxide fuel cell according to a second modification of the first embodiment. 図９は、第１実施形態の第３変形例による固体酸化物形燃料電池における多孔質金属支持層の断面図である。FIG. 9 is a cross-sectional view of a porous metal support layer in a solid oxide fuel cell according to a third modification of the first embodiment. 図１０は、その他の変形例による固体酸化物形燃料電池における多孔質金属支持層の断面図である。FIG. 10 is a cross-sectional view of a porous metal support layer in a solid oxide fuel cell according to another modification. 図１１は、第１実施形態の第４変形例による固体酸化物形燃料電池における多孔質金属支持層の断面図である。FIG. 11 is a cross-sectional view of a porous metal support layer in a solid oxide fuel cell according to a fourth modification of the first embodiment. 図１２は、その他の変形例による固体酸化物形燃料電池における多孔質金属支持層の断面図である。FIG. 12 is a cross-sectional view of a porous metal support layer in a solid oxide fuel cell according to another modification. 図１３は、その他の変形例による固体酸化物形燃料電池における多孔質金属支持層の断面図である。FIG. 13 is a cross-sectional view of a porous metal support layer in a solid oxide fuel cell according to another modification. 図１４は、第２実施形態による固体酸化物形燃料電池における、発電セルとフレームの接合部分の拡大模式図である。FIG. 14 is an enlarged schematic diagram of the joint portion between the power generating cell and the frame in the solid oxide fuel cell according to the second embodiment. 図１５は、第３実施形態による固体酸化物形燃料電池における、発電セルとフレームの接合部分の拡大模式図である。FIG. 15 is an enlarged schematic diagram of a joint portion between a power generation cell and a frame in a solid oxide fuel cell according to a third embodiment. 図１６は、第３実施形態による固体酸化物形燃料電池における、多孔質金属支持層の断面図である。FIG. 16 is a cross-sectional view of a porous metal support layer in a solid oxide fuel cell according to a third embodiment.
　以下、図面等を参照しながら、本発明の実施形態について説明する。 Embodiments of the present invention will be described below with reference to the drawings and the like.
　［第１実施形態］
　図１は、本発明の第１実施形態による固体酸化物形燃料電池１００（以下、単に「燃料電池」ともいう）を示す分解斜視図である。図１に示すように、固体酸化物形燃料電池１００は、複数のセルユニット１を上下方向に積層して構成される。なお、本実施形態の固体酸化物形燃料電池１００は、主に車両等に搭載されるが、これに限定されるものではない。 [First embodiment]
FIG. 1 is an exploded perspective view showing a solid oxide fuel cell 100 (hereinafter also simply referred to as a "fuel cell") according to a first embodiment of the present invention. As shown in FIG. 1, the solid oxide fuel cell 100 is constructed by stacking a plurality of cell units 1 in the vertical direction. Note that, although the solid oxide fuel cell 100 of this embodiment is mainly mounted on a vehicle or the like, it is not limited thereto.
　図２は、固体酸化物形燃料電池１００を構成するセルユニット１の分解斜視図である。図２に示すように、セルユニット１は、発電セル２、フレーム３、アノード流路形成部材４、カソード流路形成部材５、セパレータ６、アノードスペーサ４１及びカソードスペーサ５１等を含む。 FIG. 2 is an exploded perspective view of the cell unit 1 that constitutes the solid oxide fuel cell 100. As shown in FIG. 2, the cell unit 1 includes a power generation cell 2, a frame 3, an anode flow path forming member 4, a cathode flow path forming member 5, a separator 6, an anode spacer 41, a cathode spacer 51, and the like.
　発電セル２は、固体電解質層の一方の面にアノード電極層（第１電極層）を、他方の面にカソード電極層（第２電極層）を配置した膜電極接合体により構成される。本実施形態では、発電セル２の下面側をアノード電極層、上面側をカソード電極層とする。発電セル２には、アノードガス（燃料ガス）及びカソードガス（空気）が供給され、発電セル２は、アノード電極層及びカソード電極層での電極反応に基づき発電する。また、後述するように、発電セル２は、電極層を支持する多孔質金属支持層を含む。即ち、本実施形態の固体酸化物形燃料電池１００は、いわゆるメタルサポート式の燃料電池である。 The power generation cell 2 is constituted by a membrane electrode assembly in which an anode electrode layer (first electrode layer) is arranged on one surface of a solid electrolyte layer and a cathode electrode layer (second electrode layer) is arranged on the other surface. In this embodiment, the lower surface side of the power generation cell 2 is an anode electrode layer, and the upper surface side is a cathode electrode layer. Anode gas (fuel gas) and cathode gas (air) are supplied to the power generation cell 2, and the power generation cell 2 generates power based on electrode reactions in the anode electrode layer and the cathode electrode layer. Further, as described later, the power generation cell 2 includes a porous metal support layer that supports the electrode layer. That is, the solid oxide fuel cell 100 of this embodiment is a so-called metal support type fuel cell.
　また、発電セル２は、周縁部が、発電セル２の下に設けられた金属からなるフレーム（枠体）３により接合及び支持されており、これにより、発電セル２はフレーム（金属フレーム）３に固定されている。フレーム３は、外周縁から延設された複数の突出部を有し、突出部には、穴部３１が形成されている。 In addition, the power generation cell 2 has its peripheral edge joined and supported by a frame (frame body) 3 made of metal provided below the power generation cell 2, whereby the power generation cell 2 is connected to the frame (metal frame) 3. is fixed. The frame 3 has a plurality of protrusions extending from the outer periphery, and holes 31 are formed in the protrusions.
　アノード流路形成部材４は、金属等の導電性材料からなり、発電セル２のアノード電極層と後述のセパレータ６との間に配置され、発電セル２のアノード電極層側に、燃料ガスが流れるアノード流路を形成する。アノード流路形成部材４は、発電セル２の幅方向に直線的に延びる凹凸が長手方向に繰り返し設けられる、いわゆる波型形状に形成される。これにより、発電セル２のアノード電極層とセパレータ６との間に複数のアノード流路が区画される。 The anode flow path forming member 4 is made of a conductive material such as metal, and is disposed between the anode electrode layer of the power generation cell 2 and a separator 6, which will be described later, and allows fuel gas to flow toward the anode electrode layer side of the power generation cell 2. Form an anode flow path. The anode flow path forming member 4 is formed into a so-called wavy shape in which unevenness extending linearly in the width direction of the power generation cell 2 is repeatedly provided in the longitudinal direction. Thereby, a plurality of anode channels are defined between the anode electrode layer of the power generation cell 2 and the separator 6.
　カソード流路形成部材５は、金属等の導電性材料からなり、発電セル２のカソード電極層と（隣接するセルユニット１の）セパレータ６との間に配置され、発電セル２のカソード電極層側にカソードガス（空気）が流れるカソード流路を形成する。カソード流路形成部材５は、アノード流路形成部材４と同様に、波型形状に形成され、発電セル２のカソード電極層とセパレータ６との間に複数のカソード流路が区画される。 The cathode flow path forming member 5 is made of a conductive material such as metal, and is arranged between the cathode electrode layer of the power generation cell 2 and the separator 6 (of the adjacent cell unit 1), and is located on the cathode electrode layer side of the power generation cell 2. A cathode flow path is formed through which cathode gas (air) flows. Like the anode flow path forming member 4, the cathode flow path forming member 5 is formed in a wavy shape, and a plurality of cathode flow paths are defined between the cathode electrode layer of the power generation cell 2 and the separator 6.
　なお、図２に示すように、アノード流路を形成するアノード流路形成部材４及びカソード流路を形成するカソード流路形成部材５は、それぞれ２つに分割され離間しているが、これに限られない。例えば、分割された２つの流路部材を、隙間を開けずに近接させて配置してもよい。また、それぞれ１つの部材でアノード流路、カソード流路を形成してもよい。 As shown in FIG. 2, the anode flow path forming member 4 forming the anode flow path and the cathode flow path forming member 5 forming the cathode flow path are each divided into two parts and separated from each other. Not limited. For example, two divided flow path members may be arranged close to each other without leaving a gap. Alternatively, the anode channel and the cathode channel may each be formed by one member.
　セパレータ６は、導電性を有する板状の部材で、一方の面（上面）がアノード流路形成部材４に導電接合される。これにより、セパレータ６と発電セル２のアノード電極とは、アノード流路形成部材４を介して電気的に接続される。一方、セパレータ６の他方の面（下面）は、隣接するセルユニット１のカソード流路形成部材５に接合される。 The separator 6 is an electrically conductive plate-like member, and one surface (upper surface) is electrically bonded to the anode channel forming member 4. Thereby, the separator 6 and the anode electrode of the power generation cell 2 are electrically connected via the anode flow path forming member 4. On the other hand, the other surface (lower surface) of the separator 6 is joined to the cathode channel forming member 5 of the adjacent cell unit 1.
　また、セパレータ６は、外周縁から延設されて突出する複数の突出部を有し、当該突出部には、フレーム３の穴部３１と対応する位置に穴部６１が形成されている。セパレータ６の穴部６１と、フレーム３の穴部３１とが重なることで、アノード流路に供給される燃料ガスが流れる孔と、アノード流路から出ていく燃料ガスが流れる孔とが形成される。セパレータ６の穴部６１と、フレーム３の穴部３１とが重なることで形成される孔の周囲には、シール部材１１が設けられる。 Furthermore, the separator 6 has a plurality of protrusions extending and protruding from the outer peripheral edge, and a hole 61 is formed in the protrusion at a position corresponding to the hole 31 of the frame 3. The holes 61 of the separator 6 and the holes 31 of the frame 3 overlap to form holes through which fuel gas is supplied to the anode flow path and holes through which fuel gas exits from the anode flow path. Ru. A sealing member 11 is provided around a hole formed by overlapping the hole 61 of the separator 6 and the hole 31 of the frame 3.
　アノードスペーサ４１は、セパレータ６の外周上に積層される枠体であり、発電セル２とセパレータ６との間に配置され、アノード流路の高さを確保する。アノードスペーサ４１は、外形が発電セル２を固定するフレーム３及びセパレータ６と重なり合うように配置される。 The anode spacer 41 is a frame layered on the outer periphery of the separator 6, and is arranged between the power generation cell 2 and the separator 6 to ensure the height of the anode flow path. The anode spacer 41 is arranged so that its outer shape overlaps the frame 3 and the separator 6 to which the power generation cell 2 is fixed.
　カソードスペーサ５１は、カソード流路形成部材５の長手方向両端に配置され、カソード流路の高さを確保するとともに、カソード流路形成部材５の長手方向両端をシールする。 The cathode spacers 51 are arranged at both longitudinal ends of the cathode flow path forming member 5 to ensure the height of the cathode flow path and sealing both longitudinal ends of the cathode flow path forming member 5.
　上記のように構成された固体酸化物形燃料電池１００では、アノード流路から発電セル２のアノード電極層側に燃料ガス（アノードガス）が供給され、カソード流路から発電セル２のカソード電極層側に空気（カソードガス）が供給される。 In the solid oxide fuel cell 100 configured as described above, fuel gas (anode gas) is supplied from the anode flow path to the anode electrode layer side of the power generation cell 2, and from the cathode flow path to the cathode electrode layer side of the power generation cell 2. Air (cathode gas) is supplied to the side.
　ところで、アノード電極層に供給される燃料ガス（アノードガス）と、カソード電極層に供給されるカソードガスとが混合すると、発電性能が低下する虞がある。このため、発電セル２やガス流路（アノード流路、カソード流路）からガスがリークしないようなシーリング構造を設ける必要がある。 By the way, if the fuel gas (anode gas) supplied to the anode electrode layer and the cathode gas supplied to the cathode electrode layer mix, there is a possibility that power generation performance will deteriorate. Therefore, it is necessary to provide a sealing structure that prevents gas from leaking from the power generation cell 2 and the gas flow paths (anode flow path, cathode flow path).
　この点、平板型の発電セルを備える固体酸化物形燃料電池では、一般的に、発電セルの下にフレームを組み付け、発電セルとフレーム間をシールすることで、ガスのリークを防止する。 In this regard, in a solid oxide fuel cell equipped with a flat power generation cell, a frame is generally assembled under the power generation cell and a seal is formed between the power generation cell and the frame to prevent gas leakage.
　しかしながら、発電セルが、電極を支持する多孔質の金属支持層を備える固体酸化物形燃料電池においては、金属支持層の下に設けられたフレームと金属支持層の間をシールしても、多孔質である金属支持層の側面からガスがリークする虞がある。 However, in solid oxide fuel cells in which the power generation cell includes a porous metal support layer that supports electrodes, even if the frame provided under the metal support layer and the metal support layer are sealed, the porous There is a risk of gas leaking from the sides of the metal support layer.
　一方、発電セルにおける緻密な電解質面にフレームを接合し、電解質面とフレームとの間をシールする場合、発電セルの側面からのガスリークは防止されるが、接合境界において電解質にクラックが発生しやすくなり、発電性能が低下する虞がある。 On the other hand, when a frame is bonded to the dense electrolyte surface of a power generation cell and a seal is created between the electrolyte surface and the frame, gas leakage from the sides of the power generation cell is prevented, but cracks are likely to occur in the electrolyte at the bonding boundary. Therefore, there is a possibility that the power generation performance will deteriorate.
　これに対し、金属支持層の一部の密度を高くし、金属支持層における密度の高い部分に、金属支持層とフレームの間のガスリークを防止するシール部材を面接合させることで、発電セルの側面からのガスリーク及び発電セルとフレーム間のガスリークを防止することが考えられる。しかしながら、この場合でも、小型化、軽量化のためにフレームや発電セルを薄くすると、ガス差圧や加熱により、発電セル（金属支持層）が変形しやすくなり、シール部が剥離する虞がある。即ち、依然としてガスリークが生じる虞がある。 On the other hand, by increasing the density of a part of the metal support layer and surface-bonding the high-density part of the metal support layer with a sealing member that prevents gas leakage between the metal support layer and the frame, the power generation cell It is possible to prevent gas leaks from the sides and between the power generation cells and the frame. However, even in this case, if the frame and power generation cell are made thinner in order to reduce size and weight, the power generation cell (metal support layer) will be easily deformed due to gas pressure difference and heating, and there is a risk that the seal portion may peel off. . That is, there is still a possibility that gas leakage may occur.
　そこで、本実施形態においては、電極層を支持する多孔質金属支持層の外周部に、充填材により空孔が充填されている領域である充填部を設け、フレーム３を、２つの接合部を介して当該充填部に接合することとした。具体的には、多孔質金属支持層の外周部に沿うように形成される第１接合部と、第１接合部よりも外周側に、第１接合部と間隔を置いて配置された第２接合部とにより、フレーム３を充填部に接合する。このように、多孔質金属支持層に空孔が充填された充填部を設けることで、多孔質金属支持層の側面からのガスリークが防止される。また、充填部に、フレーム３と多孔質金属支持層を接合する２つの接合部を設けることで、充填部の変位（変形）が防止され、発電セル２とフレーム３との間におけるガスリークが防止される。従って、発電セル２の気密性が確保され、発電性能の低下が防止される。 Therefore, in this embodiment, a filling part, which is a region where pores are filled with a filling material, is provided on the outer peripheral part of the porous metal support layer that supports the electrode layer, and the frame 3 is connected to the two joint parts. It was decided that it would be joined to the filling part through the insulator. Specifically, a first bonding portion is formed along the outer periphery of the porous metal support layer, and a second bonding portion is disposed on the outer periphery side of the first bonding portion and spaced apart from the first bonding portion. The frame 3 is joined to the filling part by the joint part. In this manner, by providing the filling portion filled with pores in the porous metal support layer, gas leakage from the side surfaces of the porous metal support layer is prevented. In addition, by providing two joints in the filling part that join the frame 3 and the porous metal support layer, displacement (deformation) of the filling part is prevented, and gas leakage between the power generation cell 2 and the frame 3 is prevented. be done. Therefore, the airtightness of the power generation cell 2 is ensured, and a decrease in power generation performance is prevented.
　以下、発電セル２とフレーム３との接合構造の詳細を説明する。 Hereinafter, details of the joining structure between the power generation cell 2 and the frame 3 will be explained.
　図３は、発電セル２とフレーム３の接合部分の拡大模式図であり、図２のＡ－Ａ線に沿った断面図である。 FIG. 3 is an enlarged schematic diagram of the joint portion between the power generation cell 2 and the frame 3, and is a sectional view taken along the line AA in FIG. 2.
　図３に示すように、発電セル２は、固体電解質層２１と、固体電解質層２１の一方の面に配置されたアノード電極層（第１電極層）２２と、固体電解質層２１の他方の面に配置されたカソード電極層（第２電極層）２３と、アノード電極層２２を支持する多孔質金属支持層（メタルサポート、以下、単に金属支持層ともいう）２４とを含む。 As shown in FIG. 3, the power generation cell 2 includes a solid electrolyte layer 21, an anode electrode layer (first electrode layer) 22 disposed on one surface of the solid electrolyte layer 21, and an anode electrode layer (first electrode layer) 22 disposed on one surface of the solid electrolyte layer 21. A porous metal support layer (metal support, hereinafter also simply referred to as metal support layer) 24 that supports the anode electrode layer 22 is included.
　固体電解質層２１は、緻密セラミックス層により形成される。なお、セラミックスとは、無機物の焼結体をいい、非金属酸化物だけでなく、金属酸化物をも包含する概念である。固体電解質層２１は、酸化物イオンが伝導可能であり、一方でガスについては透過させないように構成されていればよい。例えば、固体電解質層２１は、固体酸化物セラミックスにより形成することができる。固体酸化物セラミックスとしては、特に限定されないが、例えば、ジルコニア含有材料を挙げることができる。ジルコニア含有材料としては、イットリア、酸化ネオジム、サマリウム、ガドリニウム、及びスカンジウム等をドープした安定化ジルコニアなどを挙げることができる。 The solid electrolyte layer 21 is formed of a dense ceramic layer. Note that ceramics refers to sintered bodies of inorganic substances, and is a concept that includes not only nonmetal oxides but also metal oxides. The solid electrolyte layer 21 may be configured to be able to conduct oxide ions but not allow gas to pass therethrough. For example, the solid electrolyte layer 21 can be formed of solid oxide ceramics. Solid oxide ceramics are not particularly limited, but include, for example, zirconia-containing materials. Examples of the zirconia-containing material include stabilized zirconia doped with yttria, neodymium oxide, samarium, gadolinium, scandium, and the like.
　アノード電極層２２は、多孔質構造を有し、例えば、ニッケル（Ｎｉ）等の金属及びイットリア安定化ジルコニア（ＹＳＺ）等の酸化物により形成されるが、これらに限られず、既知の如何なる材料を用いてもよい。 The anode electrode layer 22 has a porous structure and is formed of, for example, a metal such as nickel (Ni) and an oxide such as yttria-stabilized zirconia (YSZ), but is not limited to these and may be formed of any known material. May be used.
　カソード電極層２３は、多孔質構造を有し、例えば、ランタンストロンチウムコバルト複合酸化物（ＬＳＣ）、ランタンストロンチウムコバルト鉄酸化物（ＬＳＣＦ）等により形成されるが、これらに限られず、既知の如何なる材料を用いてもよい。 The cathode electrode layer 23 has a porous structure and is formed of, for example, lanthanum strontium cobalt composite oxide (LSC), lanthanum strontium cobalt iron oxide (LSCF), etc., but is not limited to these, and may be made of any known material. may also be used.
　金属支持層２４は、多孔質構造を有し、例えば、フェライト系ステンレスにより形成されるが、これに限られず、既知の如何なる材料を用いてもよい。金属支持層２４は、アノード電極層２２を支持するように設けられ、発電セル２の強度を補強するための構造部材として機能する。 The metal support layer 24 has a porous structure and is formed of, for example, ferritic stainless steel, but is not limited to this, and any known material may be used. The metal support layer 24 is provided to support the anode electrode layer 22 and functions as a structural member for reinforcing the strength of the power generation cell 2.
　また、金属支持層２４は、充填材により空孔が充填されている領域である充填部２４１と、充填材が充填されていない領域である多孔質部２４２とを有している。充填部２４１は、金属支持層２４の外周部に形成されている。充填部２４１に充填される充填材は、金属支持層２４を構成する材料よりも線膨張係数が小さい絶縁性の材料により構成され、例えば、アルミナ、ジルコニア（ＺｒＯ２）、イットリア安定化ジルコニア（ＹＳＺ）、スカンジア安定化ジルコニア（ＳｃＳＺ）等からなる粒子を用いることができる。 Further, the metal support layer 24 has a filled part 241, which is a region in which pores are filled with a filler, and a porous part 242, which is a region not filled with a filler. The filling portion 241 is formed on the outer periphery of the metal support layer 24 . The filling material filled in the filling part 241 is made of an insulating material with a coefficient of linear expansion smaller than that of the material forming the metal support layer 24, such as alumina, zirconia (ZrO 2 ), yttria-stabilized zirconia (YSZ), etc. ), scandia-stabilized zirconia (ScSZ), and the like can be used.
　このように、金属支持層２４の外周部に充填材が充填された緻密な充填部２４１が形成されているため、金属支持層２４の側面からのガスリークが防止される。 In this way, since the dense filling portion 241 filled with the filler is formed on the outer peripheral portion of the metal support layer 24, gas leakage from the side surface of the metal support layer 24 is prevented.
　金属支持層２４の下には、発電セル２を支持及び固定する金属製のフレーム３が備えられている。図３に示すように、金属支持層２４には、充填部２４１の内周側に配置された第１接合部７１、充填部２４１の外周側に、第１接合部７１と間隔を置いて配置された第２接合部７２が形成されている。フレーム３は、第１接合部７１及び第２接合部７２において、金属支持層２４に溶接（接合）されている。 A metal frame 3 that supports and fixes the power generation cell 2 is provided below the metal support layer 24. As shown in FIG. 3, the metal support layer 24 includes a first joint 71 disposed on the inner circumference side of the filling part 241, and a first joint part 71 disposed on the outer circumference side of the filler part 241 at a distance from the first joint part 71. A second joint portion 72 is formed. The frame 3 is welded (joined) to the metal support layer 24 at a first joint 71 and a second joint 72 .
　このように、金属支持層２４の充填部２４１とフレーム３とは、２つの接合部７１，７２を介して接合されているため、充填部２４１の変位（変形）が抑制され、充填部２４１とフレーム３とが剥離することが防止される。 In this way, since the filling part 241 of the metal support layer 24 and the frame 3 are joined via the two joint parts 71 and 72, the displacement (deformation) of the filling part 241 is suppressed, and the filling part 241 and This prevents the frame 3 from peeling off.
　なお、空孔に充填される充填材の平均粒径は、金属支持層２４の核空孔の空孔径の平均よりも小さい。これにより、充填材を金属支持層２４に、緻密に充填することができる。 Note that the average particle size of the filler filled in the pores is smaller than the average pore size of the core pores of the metal support layer 24. Thereby, the metal support layer 24 can be densely filled with the filler.
　また、図３に示すように、充填材は、第１接合部７１と、第２接合部７２と、金属支持層２４と、フレーム３とで囲まれる空間（空隙）Ｓにも充填される。これにより、充填部２４１とフレーム３との間の気密性がより高まる。但し、金属支持層２４とフレーム３とは、隙間なく（即ち、空間Ｓが存在しないように）接合されていてもよい。 Further, as shown in FIG. 3, the filler is also filled in the space (gap) S surrounded by the first joint 71, the second joint 72, the metal support layer 24, and the frame 3. This further improves the airtightness between the filling part 241 and the frame 3. However, the metal support layer 24 and the frame 3 may be joined without any gap (that is, without any space S).
　また、前述の通り、充填材は、金属支持層２４を構成する材料よりも線膨張係数が小さいため、高温時に充填材が熱膨張しても、金属支持層２４は押されない。即ち、充填材の熱膨張により金属支持層２４が押されて破損することが防止される。 Furthermore, as described above, the filler has a smaller coefficient of linear expansion than the material constituting the metal support layer 24, so even if the filler thermally expands at high temperatures, the metal support layer 24 will not be pushed. That is, the metal support layer 24 is prevented from being pushed and damaged due to thermal expansion of the filler.
　また、充填材は絶縁性の材料により構成されているため、充填材が金属支持層２４の側面から漏出して電極層と接続した場合にも、短絡が生じない。 Moreover, since the filler is made of an insulating material, even if the filler leaks from the side surface of the metal support layer 24 and connects to the electrode layer, no short circuit occurs.
　なお、製造工程として、充填材は、フレーム３を金属支持層２４に溶接した後に、金属支持層２４の側面から充填される。これにより、金属支持層２４の外周側の空孔を確実に充填することができ、金属支持層２４の側面からのガスリークをより確実に防止することができる。また、溶接後に充填材を充填することで、金属支持層２４に絶縁材（充填材）が混合した状態で溶接することによる品質低下を防止することができる。 In addition, as a manufacturing process, after the frame 3 is welded to the metal support layer 24, the filler is filled from the side surface of the metal support layer 24. Thereby, the pores on the outer peripheral side of the metal support layer 24 can be reliably filled, and gas leaks from the side surfaces of the metal support layer 24 can be more reliably prevented. Further, by filling the metal support layer 24 with the filler after welding, it is possible to prevent quality deterioration caused by welding the metal support layer 24 with the insulating material (filler) mixed therein.
　図４は、図３のＢ－Ｂ線に沿った金属支持層２４全体の断面図である。 FIG. 4 is a cross-sectional view of the entire metal support layer 24 along line BB in FIG. 3.
　図４に示すように、フレーム３と金属支持層２４とが接合される第１接合部７１は、セルユニット１の積層方向視で、金属支持層２４の外周部（充填部２４１）に沿って一つの環状になる線（第１環状線３２）上に、全周に渡って連続して形成されている。 As shown in FIG. 4, the first joint portion 71 where the frame 3 and the metal support layer 24 are joined is located along the outer periphery (filling portion 241) of the metal support layer 24 when viewed in the stacking direction of the cell unit 1. It is formed continuously over the entire circumference on one annular line (first annular line 32).
　また、フレーム３と金属支持層２４とが接合される第２接合部７２は、第１環状線３２よりも外周に位置する、セルユニット１の積層方向視で、金属支持層２４の外周部（充填部２４１）に沿って一つの環状になる線（第２環状線３３）上に、全周に渡って連続して形成されている。 In addition, the second joint portion 72 where the frame 3 and the metal support layer 24 are joined is located at the outer periphery of the metal support layer 24 ( It is formed continuously over the entire circumference on a line (second annular line 33) that forms one annular shape along the filling portion 241).
　このように、フレーム３は、金属支持層２４の外周部に沿うように形成される第１接合部７１と、第１接合部７１よりも外周側に、第１接合部７１と間隔を置いて配置された第２接合部７２とを介して金属支持層２４の充填部２４１に接合されている。フレーム３と充填部２４１とが２つの接合部７１，７２により接合されているため、ガス差圧や加熱等による充填部２４１の変位（変形）が抑制され、充填部２４１とフレーム３が剥離することが防止される。即ち、金属支持層２４とフレーム３との間におけるガスリークを防止することができる。 In this way, the frame 3 has the first joint 71 formed along the outer periphery of the metal support layer 24 and the first joint 71 located on the outer periphery side of the first joint 71 and spaced apart from the first joint 71 . It is joined to the filling part 241 of the metal support layer 24 via the disposed second joint part 72 . Since the frame 3 and the filling part 241 are joined by the two joining parts 71 and 72, displacement (deformation) of the filling part 241 due to gas pressure difference, heating, etc. is suppressed, and the filling part 241 and the frame 3 are separated. This will be prevented. That is, gas leakage between the metal support layer 24 and the frame 3 can be prevented.
　以上のとおり、金属支持層２４の外周部に形成された充填部２４１により金属支持層２４の側面からのガスリークが防止され、金属支持層２４の外周部に沿うように形成される第１接合部７１及び第２接合部７２により金属支持層２４とフレーム３との間におけるガスリークが防止される。従って、発電セル２の気密性が確保され、発電性能の低下が防止される。 As described above, the filling portion 241 formed on the outer periphery of the metal support layer 24 prevents gas leakage from the side surface of the metal support layer 24, and the first joint portion is formed along the outer periphery of the metal support layer 24. 71 and the second joint 72 prevent gas leakage between the metal support layer 24 and the frame 3. Therefore, the airtightness of the power generation cell 2 is ensured, and a decrease in power generation performance is prevented.
　上記した第１実施形態の固体酸化物形燃料電池１００によれば、以下の効果を得ることができる。 According to the solid oxide fuel cell 100 of the first embodiment described above, the following effects can be obtained.
　固体酸化物形燃料電池１００は、発電セル２がアノード電極層２２（第１電極層）を支持する多孔質金属支持層２４を備え、多孔質金属支持層２４は、外周部に、充填材により空孔が充填されている領域である充填部２４１を有している。また、多孔質金属支持層２４の下に設けられた金属フレーム３は、接合部を介して多孔質金属支持層２４の充填部２４１に接合されている。そして、接合部は、多孔質金属支持層２４の外周部に沿うように形成される第１接合部７１と、第１接合部７１よりも外周側に、第１接合部７１と間隔を置いて配置された第２接合部７２とを含む。このように、多孔質金属支持層２４の外周部に、空孔が充填されている充填部２４１を形成することで、多孔質金属支持層２４の側面からのガスリークが防止される。また、２つの接合部７１，７２により、金属フレーム３と多孔質金属支持層２４の充填部２４１とが接合されているため、ガス差圧や加熱等による充填部２４１の変位（変形）が抑制され、充填部２４１とフレーム３が剥離することが防止される。即ち、多孔質金属支持層２４と金属フレーム３との間におけるガスリークが防止される。従って、発電セル２の気密性が確保され、発電性能の低下が防止される。 In the solid oxide fuel cell 100, the power generation cell 2 includes a porous metal support layer 24 that supports an anode electrode layer 22 (first electrode layer), and the porous metal support layer 24 has a filler on its outer periphery. It has a filling part 241 which is a region filled with pores. Moreover, the metal frame 3 provided under the porous metal support layer 24 is joined to the filling part 241 of the porous metal support layer 24 via a joint. The bonding portion includes a first bonding portion 71 formed along the outer periphery of the porous metal support layer 24 and a spaced apart from the first bonding portion 71 on the outer circumferential side of the first bonding portion 71 . and a second joint portion 72 arranged therein. In this way, gas leakage from the side surfaces of the porous metal support layer 24 is prevented by forming the filling portion 241 filled with pores in the outer peripheral portion of the porous metal support layer 24 . In addition, since the metal frame 3 and the filling part 241 of the porous metal support layer 24 are joined by the two joining parts 71 and 72, displacement (deformation) of the filling part 241 due to gas pressure difference, heating, etc. is suppressed. This prevents the filling portion 241 and the frame 3 from peeling off. That is, gas leakage between the porous metal support layer 24 and the metal frame 3 is prevented. Therefore, the airtightness of the power generation cell 2 is ensured, and a decrease in power generation performance is prevented.
　固体酸化物形燃料電池１００は、金属フレーム３と多孔質金属支持層２４とを接合する第１及び第２接合部７１，７２を有し、第１接合部７１は、積層方向視で、多孔質金属支持層２４の外周部に沿って一つの環状になる第１環状線３２上に配置され、第２接合部７２は、第１環状線３２よりも外周に位置する環状線である第２環状線３３上に配置される。このように、金属フレーム３と多孔質金属支持層２４とを接合する接合部７１，７２が多孔質金属支持層２４の外周部における環状線３２，３３上に配置されるため、ガス差圧や加熱等による充填部２４１の変位（変形）が多孔質金属支持層２４の外周部全周に渡って抑制され、充填部２４１とフレーム３が剥離することが、より防止される。 The solid oxide fuel cell 100 has first and second joint parts 71 and 72 that join the metal frame 3 and the porous metal support layer 24, and the first joint part 71 has porous The second bonding portion 72 is disposed on the first annular line 32 that is annular along the outer periphery of the solid metal support layer 24 , and the second joint 72 is disposed on the second annular line 32 that is located on the outer periphery of the first annular line 32 . It is arranged on the circular line 33. In this way, since the joint parts 71 and 72 that join the metal frame 3 and the porous metal support layer 24 are arranged on the annular lines 32 and 33 at the outer peripheral part of the porous metal support layer 24, the gas pressure difference and Displacement (deformation) of the filling part 241 due to heating or the like is suppressed over the entire outer circumference of the porous metal support layer 24, and separation of the filling part 241 and the frame 3 is further prevented.
　固体酸化物形燃料電池１００は、金属フレーム３と多孔質金属支持層２４とを接合する第１及び第２接合部７１，７２を有し、第１接合部７１は、多孔質金属支持層２４の外周部に沿った第１環状線３２上に全周に渡って連続して設けられ、第２接合部７２は、第１環状線３２よりも外周に位置する第２環状線３３上に全周に渡って連続して設けられる。これにより、ガス差圧や加熱等による充填部２４１の変位（変形）が多孔質金属支持層２４の外周部全周に渡って抑制され、充填部２４１とフレーム３が剥離することが、より防止される。 The solid oxide fuel cell 100 has first and second joint parts 71 and 72 that join the metal frame 3 and the porous metal support layer 24 , and the first joint part 71 connects the porous metal support layer 24 to the first joint part 71 , 72 . The second joint part 72 is continuously provided on the first annular line 32 along the outer periphery of the first annular line 32, and the second joint part 72 is continuously provided on the second annular line 33 located on the outer periphery of the first annular line 32. Continuously placed around the circumference. As a result, displacement (deformation) of the filling part 241 due to gas pressure difference, heating, etc. is suppressed over the entire outer circumference of the porous metal support layer 24, and separation of the filling part 241 and the frame 3 is further prevented. be done.
　固体酸化物形燃料電池１００は、多孔質金属支持層２４が、外周部に、充填材により空孔が充填されている充填部２４１を有し、充填材の線膨張係数は、多孔質金属支持層２４を構成する多孔質金属材料の線膨張係数よりも小さい。これにより、充填材の熱膨張により金属支持層２４が押されて破損することが防止される。 In the solid oxide fuel cell 100, the porous metal support layer 24 has a filling part 241 in which pores are filled with a filler in the outer peripheral part, and the linear expansion coefficient of the filler is equal to that of the porous metal support. It is smaller than the linear expansion coefficient of the porous metal material that constitutes the layer 24. This prevents the metal support layer 24 from being pushed and damaged due to thermal expansion of the filler.
　なお、本実施形態では、発電セル２の下面側をアノード電極層（第１電極層）、上面側をカソード電極層（第２電極層）としたが、必ずしもこれに限られず、発電セル２の下面側をカソード電極層、上面側をアノード電極層としてもよい。 In this embodiment, the lower surface side of the power generation cell 2 is the anode electrode layer (first electrode layer), and the upper surface side is the cathode electrode layer (second electrode layer), but this is not necessarily the case. The lower surface side may be used as a cathode electrode layer, and the upper surface side may be used as an anode electrode layer.
　また、本実施形態では、アノード電極層２２側に金属支持層２４を備える構成としたが、必ずしもこれに限られない。即ち、金属支持層２４が少なくとも一方の電極側に設けられており、金属支持層２４と金属フレーム３とが接合されていればよい。 Further, in this embodiment, the metal support layer 24 is provided on the anode electrode layer 22 side, but the structure is not necessarily limited to this. That is, it is sufficient that the metal support layer 24 is provided on at least one electrode side, and the metal support layer 24 and the metal frame 3 are bonded.
　また、図２で説明したアノード流路及びカソード流路等の構成は一例であり、特にこれに限られるものではない。 Furthermore, the configurations of the anode flow path, cathode flow path, etc. described in FIG. 2 are merely examples, and are not particularly limited thereto.
　また、本実施形態では、第１接合部７１は、充填部２４１のある位置に形成されているが、必ずしもこれに限られない。例えば、第１接合部７１は、充填部２４１と多孔質部２４２とに跨って形成されていてもよく、また、充填部２４１近傍の多孔質部２４２に形成されていてもよい。 Further, in the present embodiment, the first joint portion 71 is formed at a certain position of the filling portion 241, but the first joint portion 71 is not necessarily limited to this. For example, the first joint portion 71 may be formed across the filling portion 241 and the porous portion 242, or may be formed in the porous portion 242 near the filling portion 241.
　また、本実施形態のように、金属フレーム３は溶接により多孔質金属支持層２４に接合されていることが好ましいが、接合方法は必ずしもこれに限られない。例えば、図５に示す発電セル２の断面図のように、金属フレーム３は、ろう付けにより多孔質金属支持層２４に接合されていてもよい。 Further, as in this embodiment, it is preferable that the metal frame 3 is joined to the porous metal support layer 24 by welding, but the joining method is not necessarily limited to this. For example, as shown in the cross-sectional view of the power generation cell 2 shown in FIG. 5, the metal frame 3 may be joined to the porous metal support layer 24 by brazing.
　また、本実施形態では、充填材を金属支持層２４に充填して、金属支持層２４に充填部２４１を形成しているが、必ずしもこれに限られない。例えば、金属支持層２４だけでなく、金属支持層２４に積層された電極層（アノード電極層２２）にも充填材を充填して、電極層にも充填部を形成させてもよい。これにより、多孔質構造を有する電極層からのガスリークを防止することができ、発電セル２の気密性をより確保することができる。但し、電極層は金属支持層２４に比べて非常に薄いため、金属支持層２４のみに充填部２４１を形成した本実施形態の構成であっても、ガスリークを防止することができる。 Further, in this embodiment, the metal support layer 24 is filled with a filler to form the filling portion 241 in the metal support layer 24, but the present invention is not necessarily limited to this. For example, not only the metal support layer 24 but also the electrode layer (anode electrode layer 22) laminated on the metal support layer 24 may be filled with the filler to form a filling portion in the electrode layer as well. Thereby, gas leakage from the electrode layer having a porous structure can be prevented, and the airtightness of the power generation cell 2 can be further ensured. However, since the electrode layer is much thinner than the metal support layer 24, gas leakage can be prevented even with the configuration of this embodiment in which the filling portion 241 is formed only in the metal support layer 24.
　［第１実施形態の第１変形例］
　図６を参照して第１実施形態の第１変形例による固体酸化物形燃料電池１００を説明する。本実施形態では、第２接合部７２が不連続に形成されている点が第１実施形態と異なる。なお、第１実施形態と同様の要素には同一の符号を付し、その説明を省略する。 [First modification of the first embodiment]
A solid oxide fuel cell 100 according to a first modification of the first embodiment will be described with reference to FIG. 6. This embodiment differs from the first embodiment in that the second joint portion 72 is formed discontinuously. Note that the same elements as in the first embodiment are denoted by the same reference numerals, and the description thereof will be omitted.
　図６は、本変形例による固体酸化物形燃料電池１００における多孔質金属支持層２４の断面図であり、図３のＢ－Ｂ線に沿った金属支持層２４全体の断面図に相当する。 FIG. 6 is a sectional view of the porous metal support layer 24 in the solid oxide fuel cell 100 according to this modification, and corresponds to a sectional view of the entire metal support layer 24 along line BB in FIG. 3.
　図６に示すように、本変形例においては、第２接合部７２が、第２環状線３３上において、不連続に配置されている。具体的には、第２接合部７２は、間隔を置いた点線状に配置されている。即ち、フレーム３は、第２環状線３３上の第２接合部７２において、金属支持層２４に点線状に溶接されている。これにより、第２接合部７２が連続して形成される場合に比べ、溶接時に金属支持層２４が熱歪により変形することが抑制される。従って、発電セル２の気密性が強化され、多孔質金属支持層２４と金属フレーム３との間のガスリークがより防止される。 As shown in FIG. 6, in this modification, the second joint portions 72 are arranged discontinuously on the second annular line 33. Specifically, the second joint portions 72 are arranged in a dotted line shape with intervals. That is, the frame 3 is welded to the metal support layer 24 in a dotted line shape at the second joint portion 72 on the second annular line 33 . This suppresses deformation of the metal support layer 24 due to thermal strain during welding, compared to the case where the second joint portions 72 are formed continuously. Therefore, the airtightness of the power generation cell 2 is strengthened, and gas leakage between the porous metal support layer 24 and the metal frame 3 is further prevented.
　また、金属支持層２４の外周部の第２接合部７２が途切れている部位も、充填材によりシールされているため、当該部位においても、充填材により多孔質金属支持層２４と金属フレーム３との間のガスリークが防止される。 In addition, since the part where the second joint part 72 on the outer periphery of the metal support layer 24 is interrupted is also sealed with the filler, the porous metal support layer 24 and the metal frame 3 are connected by the filler at this part as well. This prevents gas leaks during
　なお、本変形例では、第２接合部７２を、間隔を置いた点線状に配置しているが、必ずしもこれに限られない。例えば、図７の多孔質金属支持層２４の断面図に示すように、第２接合部７２は、第２環状線３３上において、間隔を置いて複数配置されるとともに、第１環状線３２に対し垂直な方向に延びるように設けられていてもよい。このような構成においても、溶接時に金属支持層２４が熱歪により変形することが抑制される。 Note that in this modification, the second joint portions 72 are arranged in a dotted line shape with intervals, but the arrangement is not necessarily limited to this. For example, as shown in the cross-sectional view of the porous metal support layer 24 in FIG. It may be provided so as to extend in a direction perpendicular to the other direction. Also in such a configuration, deformation of the metal support layer 24 due to thermal strain during welding is suppressed.
　［第１実施形態の第２変形例］
　図８を参照して第１実施形態の第２変形例による固体酸化物形燃料電池１００を説明する。本実施形態では、第１接合部７１が不連続に形成されている点が他の実施形態と異なる。なお、他の実施形態と同様の要素には同一の符号を付し、その説明を省略する。 [Second modification of the first embodiment]
A solid oxide fuel cell 100 according to a second modification of the first embodiment will be described with reference to FIG. 8. This embodiment differs from other embodiments in that the first joint portion 71 is formed discontinuously. Note that the same elements as in other embodiments are denoted by the same reference numerals, and the explanation thereof will be omitted.
　図８は、本変形例による固体酸化物形燃料電池１００における多孔質金属支持層２４の断面図であり、図３のＢ－Ｂ線に沿った金属支持層２４全体の断面図に相当する。 FIG. 8 is a sectional view of the porous metal support layer 24 in the solid oxide fuel cell 100 according to this modification, and corresponds to a sectional view of the entire metal support layer 24 along line BB in FIG. 3.
　図８に示すように、本変形例においては、第１接合部７１が、第１環状線３２上において、不連続に配置されている。具体的には、第１接合部７１は、間隔を置いた点線状に配置されている。即ち、フレーム３は、第１環状線３２上の第１接合部７１において、金属支持層２４に点線状に溶接されている。 As shown in FIG. 8, in this modification, the first joint portions 71 are arranged discontinuously on the first annular line 32. Specifically, the first joint portions 71 are arranged in a dotted line shape with intervals. That is, the frame 3 is welded to the metal support layer 24 in a dotted line shape at the first joint 71 on the first annular line 32 .
　一方、第２接合部７２も、第１実施形態の第１変形例と同様に、間隔を置いた点線状に配置されている。即ち、フレーム３は、第２環状線３３上の第２接合部７２において、金属支持層２４に点線状に溶接されている。 On the other hand, the second joint portions 72 are also arranged in a dotted line shape with intervals, similar to the first modification of the first embodiment. That is, the frame 3 is welded to the metal support layer 24 in a dotted line shape at the second joint portion 72 on the second annular line 33 .
　また、第１接合部７１と、第２接合部７２とは、接合部が途切れる部位が重畳しないように、セルユニット１の積層方向視で千鳥状に配置されている。即ち、第１接合部７１と第２接合部７２とは、積層方向視で、少なくとも金属支持層２４の充填部２４１の外周側及び内周側のいずれか一方に接合部が存在するように、配置されている。 Further, the first joint portion 71 and the second joint portion 72 are arranged in a staggered manner when viewed in the stacking direction of the cell unit 1 so that the portions where the joint portions are interrupted do not overlap. That is, the first bonding portion 71 and the second bonding portion 72 are arranged such that the bonding portion exists at least on either the outer circumferential side or the inner circumferential side of the filling portion 241 of the metal support layer 24 when viewed in the stacking direction. It is located.
　このように、第１接合部７１及び第２接合部７２のいずれも間隔を置いた点線状に配置することで、溶接時に金属支持層２４が熱歪により変形することが、より抑制される。また、積層方向視で、少なくとも金属支持層２４の充填部２４１の外周側及び内周側のいずれか一方に接合部が存在するように、第１接合部７１と第２接合部７２を千鳥状に配置しているため、ガス差圧や加熱による充填部２４１の変位が抑制される。従って、発電セル２の気密性が強化され、多孔質金属支持層２４と金属フレーム３との間のガスリークがより防止される。 In this way, by arranging both the first joint portion 71 and the second joint portion 72 in a dotted line shape with an interval between them, deformation of the metal support layer 24 due to thermal strain during welding is further suppressed. In addition, the first joint portion 71 and the second joint portion 72 are arranged in a staggered manner so that the joint portion exists at least on either the outer circumferential side or the inner circumferential side of the filling portion 241 of the metal support layer 24 when viewed in the stacking direction. Since the filling portion 241 is disposed in the same direction, displacement of the filling portion 241 due to gas pressure difference or heating is suppressed. Therefore, the airtightness of the power generation cell 2 is strengthened, and gas leakage between the porous metal support layer 24 and the metal frame 3 is further prevented.
　なお、本変形例では、第１接合部７１及び第２接合部７２のいずれも間隔を置いた点線状に配置しているが、必ずしもこれに限られず、第１接合部７１のみを間隔を置いた点線状に配置し、第２接合部７２は、第２環状線３３上に全周に渡って連続して設けられていてもよい。また、第１接合部７１を、間隔を置いた点線状に配置し、第２接合部７２は、第２環状線３３上において、間隔を置いて複数配置されるとともに、第１環状線３２に対し垂直な方向に延びるように設けられていてもよい。このような構成であっても、溶接時に金属支持層２４が熱歪により変形することが、抑制される。 Note that in this modification, both the first joint portion 71 and the second joint portion 72 are arranged in a dotted line shape with an interval between them, but this is not necessarily the case. The second joint portion 72 may be arranged in a dotted line shape, and the second joint portion 72 may be continuously provided on the second annular line 33 over the entire circumference. Further, the first joint portions 71 are arranged in a dotted line shape with intervals, and a plurality of second joint portions 72 are arranged at intervals on the second annular line 33, and on the first annular line 32. It may be provided so as to extend in a direction perpendicular to the other direction. Even with such a configuration, deformation of the metal support layer 24 due to thermal strain during welding is suppressed.
　［第１実施形態の第３変形例］
　図９を参照して第１実施形態の第３変形例による固体酸化物形燃料電池１００を説明する。本実施形態では、第１接合部７１が角部において不連続に形成されている点が他の実施形態と異なる。なお、他の実施形態と同様の要素には同一の符号を付し、その説明を省略する。 [Third modification of first embodiment]
A solid oxide fuel cell 100 according to a third modification of the first embodiment will be described with reference to FIG. 9. This embodiment differs from other embodiments in that the first joint portion 71 is formed discontinuously at the corner. Note that the same elements as in other embodiments are denoted by the same reference numerals, and the explanation thereof will be omitted.
　図９は、本変形例による固体酸化物形燃料電池１００における多孔質金属支持層２４の断面図であり、図３のＢ－Ｂ線に沿った金属支持層２４全体の断面図に相当する。 FIG. 9 is a sectional view of the porous metal support layer 24 in the solid oxide fuel cell 100 according to this modification, and corresponds to a sectional view of the entire metal support layer 24 along line BB in FIG. 3.
　図９に示すように、本変形例においては、第１接合部７１が、第１環状線３２上において、角部が不連続になるように配置されている。即ち、第１環状線３２の角部においては、金属支持層２４にフレーム３を接合していない。通常、接合部に曲がる部位が存在すると、接合作業（溶接等）が難しくなるが、本変形例においては、第１接合部７１に曲がる部位が存在しないため、フレーム３と金属支持層２４との接合（溶接等）が容易になる。 As shown in FIG. 9, in this modification, the first joint portion 71 is arranged on the first annular line 32 so that the corner portions are discontinuous. That is, the frame 3 is not joined to the metal support layer 24 at the corners of the first annular wire 32 . Normally, if there is a bending part in the joint part, joining work (welding etc.) becomes difficult, but in this modification, since there is no bending part in the first joint part 71, the frame 3 and the metal support layer 24 are Joining (welding, etc.) becomes easier.
　なお、図９では、第２接合部７２を、間隔を置いた点線状に配置しているが、これに限られない。例えば、第２接合部７２を第２環状線３３上に全周に渡って連続して配置してもよく、また、図１０に示すように、第２接合部７２を、間隔を置いて、第１環状線３２に対し垂直な方向に延びるように複数配置してもよい。 Note that in FIG. 9, the second joint portions 72 are arranged in a dotted line shape with intervals, but the arrangement is not limited thereto. For example, the second joint portions 72 may be arranged continuously over the entire circumference on the second annular line 33, or as shown in FIG. 10, the second joint portions 72 may be arranged at intervals, A plurality of them may be arranged so as to extend in a direction perpendicular to the first annular line 32.
　［第１実施形態の第４変形例］
　図１１を参照して第１実施形態の第４変形例による固体酸化物形燃料電池１００を説明する。本実施形態では、第２接合部７２が角部において対角線上に延びるように形成される対角線状接合部７２１を含む点が第１実施形態の第３変形例と異なる。なお、他の実施形態と同様の要素には同一の符号を付し、その説明を省略する。 [Fourth modification of the first embodiment]
A solid oxide fuel cell 100 according to a fourth modification of the first embodiment will be described with reference to FIG. 11. This embodiment differs from the third modification of the first embodiment in that the second joint 72 includes a diagonal joint 721 formed to extend diagonally at a corner. Note that the same elements as in other embodiments are denoted by the same reference numerals, and the explanation thereof will be omitted.
　図１１は、本変形例による固体酸化物形燃料電池１００における多孔質金属支持層２４の断面図である。 FIG. 11 is a cross-sectional view of the porous metal support layer 24 in the solid oxide fuel cell 100 according to this modification.
　図１１に示すように、本変形例においては、第１接合部７１が、第１環状線３２上において、角部が不連続になるように配置され、第２接合部７２は、第２環状線３３上に点線状に配置されている。また、第２接合部７２は、第２環状線３３の角部において対角線上に延びるように形成された対角線状接合部７２１を有している。これにより、第１接合部７１が途切れている角部において、対角線状接合部７２１によりフレーム３と金属支持層２４の充填部２４１との接合が強化されているため、ガス差圧や加熱による充填部２４１の変位が抑制される。従って、発電セル２の気密性が強化され、多孔質金属支持層２４と金属フレーム３との間のガスリークがより防止される。また、第１接合部７１及び第２接合部７２のいずれも、曲がる部位が存在しないため、フレーム３と金属支持層２４との接合（溶接等）が容易になる。 As shown in FIG. 11, in this modification, the first joint 71 is disposed on the first annular line 32 so that the corner is discontinuous, and the second joint 72 is disposed on the second annular line 32. They are arranged in a dotted line shape on the line 33. Further, the second joint portion 72 has a diagonal joint portion 721 formed to extend diagonally at the corner of the second annular line 33 . As a result, at the corner where the first joint part 71 is interrupted, the connection between the frame 3 and the filling part 241 of the metal support layer 24 is strengthened by the diagonal joint part 721. Displacement of the portion 241 is suppressed. Therefore, the airtightness of the power generation cell 2 is strengthened, and gas leakage between the porous metal support layer 24 and the metal frame 3 is further prevented. Moreover, since there is no bending part in either the first joint part 71 or the second joint part 72, the joining (welding, etc.) between the frame 3 and the metal support layer 24 becomes easy.
　なお、本変形例では、第２接合部７２を、間隔を置いた点線状に配置しているが、これに限られず、例えば、図１２に示すように、第２接合部７２は、第２環状線３３の角部において対角線上に延びるように形成された対角線状接合部７２１のみから形成されていてもよい。 In addition, in this modification, the second joint parts 72 are arranged in a dotted line shape with intervals, but the invention is not limited to this. For example, as shown in FIG. It may be formed only from diagonal joints 721 that are formed to extend diagonally at the corners of the annular wire 33.
　上記の第１実施形態及び第１実施形態の第１～第４変形例で説明した接合部の形状は、それぞれ単独の実施形態として説明したが、適宜組み合わせてもよい。即ち、第１及び第２接合部７１，７２は、全周に渡って連続した形状、間隔を置いた点線状、垂直方向に延びる形状、角部が不連続な形状等のいずれの形状を有していてもよく、組合せも任意である。さらに、第１及び第２接合部７１，７２は、金属支持層２４の長手方向と短手方向とで異なる形状を有するようにしてもよい。例えば、図１３に示すように、第２接合部７２を、金属支持層２４の長手方向においては間隔を置いて、第１環状線３２に対し垂直な方向に延びるように複数配置し、短手方向においては間隔を置いた点線状に配置してもよい。 Although the shapes of the joint portions described in the first embodiment and the first to fourth modifications of the first embodiment are each described as a single embodiment, they may be combined as appropriate. That is, the first and second joints 71 and 72 may have any shape, such as a continuous shape over the entire circumference, a dotted line shape with intervals, a shape extending in the vertical direction, or a shape with discontinuous corners. The combination may be arbitrary. Furthermore, the first and second joints 71 and 72 may have different shapes in the longitudinal direction and the lateral direction of the metal support layer 24. For example, as shown in FIG. 13, a plurality of second joint portions 72 are arranged at intervals in the longitudinal direction of the metal support layer 24 and extend in a direction perpendicular to the first annular line 32, and They may be arranged in a dotted line shape with intervals in the direction.
　［第２実施形態］
　図１４を参照して、第２実施形態の固体酸化物形燃料電池１００を説明する。本実施形態では、第１接合部７１と第２接合部７２とで、溶接深さが異なる点が第１実施形態と異なる。なお、第１実施形態と同様の要素には同一の符号を付し、その説明を省略する。 [Second embodiment]
A solid oxide fuel cell 100 according to a second embodiment will be described with reference to FIG. 14. This embodiment differs from the first embodiment in that the first joint 71 and the second joint 72 have different welding depths. Note that the same elements as in the first embodiment are denoted by the same reference numerals, and the description thereof will be omitted.
　図１４は、発電セル２とフレーム３の接合部分の拡大模式図であり、図２のＡ－Ａ線に沿った断面図に相当する。 FIG. 14 is an enlarged schematic diagram of the joint portion between the power generation cell 2 and the frame 3, and corresponds to a cross-sectional view taken along line AA in FIG. 2.
　図１４に示すように、フレーム３は、充填部２４１の内周側の第１接合部７１及び外周側の第２接合部７２において、金属支持層２４に溶接されている。第１接合部７１における溶接深さ（溶け込み深さ）は、第２接合部７２における溶接深さ（溶け込み深さ）よりも、Ｈだけ大きい。 As shown in FIG. 14, the frame 3 is welded to the metal support layer 24 at a first joint 71 on the inner peripheral side and a second joint 72 on the outer peripheral side of the filling part 241. The welding depth (penetration depth) at the first joint portion 71 is larger than the welding depth (penetration depth) at the second joint portion 72 by H.
　このように、外周側の第２接合部７２の溶接深さをより小さくしているため、金属支持層２４の側面から充填材を充填する際に、第２接合部７２により充填材の充填が妨げられることが抑制され、金属支持層２４の側面から充填材を充填しやすくなる。一方、内周側の第１接合部７１の溶接深さをより大きくしているため、第１接合部７１により、発電セル２の中央部に充填材が侵入することが抑制される。即ち、絶縁性の充填材が発電セル２の中央部に侵入して、発電セル２のアクティブエリア（発電に寄与する部分）の面積が減少することが抑制される。 In this way, since the welding depth of the second joint 72 on the outer circumferential side is made smaller, when filling the filler from the side surface of the metal support layer 24, the second joint 72 prevents the filling of the filler. This prevents interference and makes it easier to fill the metal support layer 24 with the filler from the side surface. On the other hand, since the welding depth of the first joint part 71 on the inner peripheral side is made larger, the first joint part 71 suppresses the filler from entering the central part of the power generation cell 2. That is, the insulating filler is prevented from entering the center of the power generation cell 2 and reducing the area of the active area (portion that contributes to power generation) of the power generation cell 2.
　上記した第２実施形態の固体酸化物形燃料電池１００によれば、以下の効果を得ることができる。 According to the solid oxide fuel cell 100 of the second embodiment described above, the following effects can be obtained.
　固体酸化物形燃料電池１００は、金属フレーム３が、第１接合部７１と、第１接合部７１よりも外周側に配置された第２接合部７２とにおいて多孔質金属支持層２４に溶接され、第１接合部７１における溶接深さは、第２接合部７２における溶接深さよりも大きい。このように、外周側の第２接合部７２の溶接深さをより小さくしているため、多孔質金属支持層２４の側面から充填材を充填しやすくなり、充填部２４１への充填をより確実にすることができる。 In the solid oxide fuel cell 100, the metal frame 3 is welded to the porous metal support layer 24 at a first joint 71 and a second joint 72 disposed on the outer peripheral side of the first joint 71. , the welding depth at the first joint 71 is greater than the welding depth at the second joint 72. In this way, since the welding depth of the second joint part 72 on the outer circumferential side is made smaller, it becomes easier to fill the filler from the side surface of the porous metal support layer 24, and the filling part 241 is more reliably filled. It can be done.
　また、内周側の第１接合部７１の溶接深さをより大きくしているため、発電セル２の中央部に充填材が侵入することが抑制され、発電セル２のアクティブエリアの面積の減少を抑制することができる。 In addition, since the welding depth of the first joint 71 on the inner peripheral side is made larger, the intrusion of the filler material into the center of the power generation cell 2 is suppressed, and the area of the active area of the power generation cell 2 is reduced. can be suppressed.
　［第３実施形態］
　図１５及び図１６を参照して、第３実施形態の固体酸化物形燃料電池１００を説明する。本実施形態では、金属フレーム３が開口部３４を有している点が、他の実施形態と異なる。なお、他の実施形態と同様の要素には同一の符号を付し、その説明を省略する。 [Third embodiment]
A solid oxide fuel cell 100 according to a third embodiment will be described with reference to FIGS. 15 and 16. This embodiment differs from other embodiments in that the metal frame 3 has an opening 34. Note that the same elements as in other embodiments are denoted by the same reference numerals, and the explanation thereof will be omitted.
　図１５は、発電セル２とフレーム３の接合部分の拡大模式図であり、図２のＡ－Ａ線に沿った断面図に相当する。また、図１６は、図１５のＣ－Ｃ線に沿った多孔質金属支持層２４全体の断面図である。 FIG. 15 is an enlarged schematic diagram of the joint portion between the power generation cell 2 and the frame 3, and corresponds to a cross-sectional view taken along the line AA in FIG. 2. Further, FIG. 16 is a cross-sectional view of the entire porous metal support layer 24 along line CC in FIG. 15.
　図１５及び図１６に示すように、フレーム３は、充填部２４１の内周側の第１接合部７１及び外周側の第２接合部７２において、金属支持層２４に溶接されている。また、フレーム３は、第１接合部７１と第２接合部７２との間に、下方向かって開口された複数の開口部３４を有している。 As shown in FIGS. 15 and 16, the frame 3 is welded to the metal support layer 24 at a first joint 71 on the inner peripheral side and a second joint 72 on the outer peripheral side of the filling part 241. Further, the frame 3 has a plurality of openings 34 opened downward between the first joint 71 and the second joint 72.
　このように、フレーム３が、第１接合部７１と第２接合部７２との間に開口部３４を有しているため、金属支持層２４の側面から充填材を充填した際に、第１接合部７１と第２接合部７２との間の金属支持層２４（即ち、充填部２４１）全体に充填材が充填されると、充填材は開口部３４まで到達する。即ち、充填材が第１接合部７１と第２接合部７２との間に充填されたことを開口部３４から確認することができる。従って、充填部２４１への充填をより確実にすることができる。 In this way, since the frame 3 has the opening 34 between the first joint part 71 and the second joint part 72, when the filler is filled from the side surface of the metal support layer 24, the first When the entire metal support layer 24 (namely, the filling portion 241) between the bonding portion 71 and the second bonding portion 72 is filled with the filler, the filler reaches the opening 34. That is, it can be confirmed from the opening 34 that the filler has been filled between the first joint 71 and the second joint 72. Therefore, the filling portion 241 can be filled more reliably.
　なお、本実施形態においても、図１５のように、第１接合部７１における溶接深さは、第２接合部７２における溶接深さよりも大きいことが好ましいが、必ずしもこれに限られず、例えば、第１接合部７１及び第２接合部７２の溶接深さが同等であってもよい。 In this embodiment as well, as shown in FIG. 15, the welding depth at the first joint 71 is preferably greater than the welding depth at the second joint 72, but is not necessarily limited to this. The welding depths of the first joint portion 71 and the second joint portion 72 may be the same.
　上記した第３実施形態の固体酸化物形燃料電池１００によれば、以下の効果を得ることができる。 According to the solid oxide fuel cell 100 of the third embodiment described above, the following effects can be obtained.
　固体酸化物形燃料電池１００は、金属フレーム３が、第１接合部７１及び第２接合部７２との間に開口部３４を有している。これにより、充填材が第１接合部７１と第２接合部７２との間に充填されたことを開口部３４から確認することができ、充填部２４１への充填をより確実にすることができる。即ち、金属支持層２４の側面からのガスリークをより防止することができる。 In the solid oxide fuel cell 100, the metal frame 3 has an opening 34 between the first joint 71 and the second joint 72. Thereby, it can be confirmed from the opening 34 that the filler is filled between the first joint part 71 and the second joint part 72, and the filling part 241 can be filled more reliably. . That is, gas leakage from the side surfaces of the metal support layer 24 can be further prevented.
　以上、本発明の実施形態について説明したが、上記実施形態は本発明の適用例の一部を示したに過ぎず、本発明の技術的範囲を上記実施形態の具体的構成に限定する趣旨ではない。 Although the embodiments of the present invention have been described above, the above embodiments merely show a part of the application examples of the present invention, and are not intended to limit the technical scope of the present invention to the specific configurations of the above embodiments. do not have.
　上記した各実施形態は、それぞれ単独の実施形態として説明したが、適宜組み合わせてもよい。 Although each of the embodiments described above has been described as a single embodiment, they may be combined as appropriate.

Claims (11)

  1. 　第１電極層と、前記第１電極層上に積層された固体電解質層と、前記固体電解質層上に積層された第２電極層と、前記第１電極層を支持する多孔質金属支持層とからなる発電セルが複数積層された固体酸化物形燃料電池であって、
    　前記多孔質金属支持層の下に設けられた金属フレームを備え、
    　前記多孔質金属支持層は、充填材により空孔が充填されている領域である充填部を当該多孔質金属支持層の外周部に有し、
    　前記金属フレームは、接合部を介して前記多孔質金属支持層の前記充填部に接合され、
    　前記接合部は、前記多孔質金属支持層の外周部に沿うように形成される第１接合部と、前記第１接合部よりも外周側に、前記第１接合部と間隔を置いて配置された第２接合部とを含む、
    　固体酸化物形燃料電池。     a first electrode layer, a solid electrolyte layer laminated on the first electrode layer, a second electrode layer laminated on the solid electrolyte layer, and a porous metal support layer supporting the first electrode layer. A solid oxide fuel cell in which a plurality of power generation cells are stacked,
    a metal frame provided under the porous metal support layer;
    The porous metal support layer has a filling part, which is a region in which pores are filled with a filler, on the outer periphery of the porous metal support layer,
    The metal frame is joined to the filling part of the porous metal support layer via a joint part,
    The bonding portion includes a first bonding portion formed along the outer periphery of the porous metal support layer, and a first bonding portion disposed on the outer circumferential side of the first bonding portion and spaced apart from the first bonding portion. a second joint,
    Solid oxide fuel cell.
  2. 　請求項１に記載の固体酸化物形燃料電池であって、
    　前記金属フレームは、前記第１接合部及び前記第２接合部において前記多孔質金属支持層に溶接され、
    　前記第１接合部における溶接深さは、前記第２接合部における溶接深さよりも大きい、
    　固体酸化物形燃料電池。     The solid oxide fuel cell according to claim 1,
    the metal frame is welded to the porous metal support layer at the first joint and the second joint;
    the welding depth at the first joint is greater than the welding depth at the second joint;
    Solid oxide fuel cell.
  3. 　請求項１または２に記載の固体酸化物形燃料電池であって、
    　前記第１接合部は、積層方向視で、一つの環状になる第１環状線上に配置され、
    　前記第２接合部は、前記第１環状線よりも外周に位置する環状線である第２環状線上に配置される、
    　固体酸化物形燃料電池。     The solid oxide fuel cell according to claim 1 or 2,
    The first joint portion is arranged on a first annular line forming one annular shape when viewed in the stacking direction,
    The second joint portion is arranged on a second annular line that is an annular line located on an outer periphery of the first annular line.
    Solid oxide fuel cell.
  4. 　請求項３に記載の固体酸化物形燃料電池であって、
    　前記第１接合部は、前記第１環状線上に全周に渡って連続して設けられ、
    　前記第２接合部は、前記第２環状線上に全周に渡って連続して設けられる、
    　固体酸化物形燃料電池。     The solid oxide fuel cell according to claim 3,
    The first joint portion is provided continuously over the entire circumference on the first annular line,
    The second joint portion is provided continuously over the entire circumference on the second annular line,
    Solid oxide fuel cell.
  5. 　請求項３に記載の固体酸化物形燃料電池であって、
    　前記第２接合部は、前記第２環状線上において、間隔を置いた点線状に配置される、
    　固体酸化物形燃料電池。     The solid oxide fuel cell according to claim 3,
    The second joint portions are arranged in dotted lines at intervals on the second annular line,
    Solid oxide fuel cell.
  6. 　請求項３に記載の固体酸化物形燃料電池であって、
    　前記第２接合部は、前記第２環状線上において、間隔を置いて複数配置されるとともに、前記第１環状線に対し垂直な方向に延びるように設けられる、
    　固体酸化物形燃料電池。     The solid oxide fuel cell according to claim 3,
    A plurality of the second joints are arranged at intervals on the second annular line, and are provided so as to extend in a direction perpendicular to the first annular line.
    Solid oxide fuel cell.
  7. 　請求項３に記載の固体酸化物形燃料電池であって、
    　前記第１接合部は、前記第１環状線上において、間隔を置いた点線状に配置される、
    　固体酸化物形燃料電池。     The solid oxide fuel cell according to claim 3,
    The first joint portions are arranged in dotted lines at intervals on the first annular line,
    Solid oxide fuel cell.
  8. 　請求項３に記載の固体酸化物形燃料電池であって、
    　前記第２接合部は、前記第２環状線上において、間隔を置いた点線状に配置され、
    　前記第１接合部は、前記第１環状線上において、間隔を置いた点線状に配置され、
    　前記第１接合部と、前記第２接合部とは、積層方向視で、千鳥状に配置される、
    　固体酸化物形燃料電池。     The solid oxide fuel cell according to claim 3,
    The second joint portion is arranged in a dotted line shape at intervals on the second annular line,
    The first joint portions are arranged in dotted lines at intervals on the first annular line,
    The first joint portion and the second joint portion are arranged in a staggered manner when viewed in the stacking direction.
    Solid oxide fuel cell.
  9. 　請求項３に記載の固体酸化物形燃料電池であって、
    　前記第１接合部は、前記第１環状線上において、角部が不連続になるように配置される、
    　固体酸化物形燃料電池。     The solid oxide fuel cell according to claim 3,
    The first joint portion is arranged such that the corner portion is discontinuous on the first annular line.
    Solid oxide fuel cell.
  10. 　請求項１または２に記載の固体酸化物形燃料電池であって、
    　前記金属フレームは、前記第１接合部と前記第２接合部との間に開口部を有している、
    　固体酸化物形燃料電池。     The solid oxide fuel cell according to claim 1 or 2,
    The metal frame has an opening between the first joint part and the second joint part,
    Solid oxide fuel cell.
  11. 　請求項１または２に記載の固体酸化物形燃料電池であって、
    　前記充填材の線膨張係数は、前記多孔質金属支持層を構成する多孔質金属材料の線膨張係数よりも小さい、
    　固体酸化物形燃料電池。     The solid oxide fuel cell according to claim 1 or 2,
    The coefficient of linear expansion of the filler is smaller than the coefficient of linear expansion of the porous metal material constituting the porous metal support layer.
    Solid oxide fuel cell.
PCT/JP2022/025857 2022-06-28 2022-06-28 Solid oxide fuel battery WO2024004062A1 (en)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008159428A (en) * 2006-12-25 2008-07-10 Nissan Motor Co Ltd Porous structure, and solid oxide fuel cell and fuel cell stack using the same
JP2009146882A (en) * 2007-10-05 2009-07-02 Topsoee Fuel Cell As Seal for fuel cell support
JP2011518416A (en) * 2008-04-18 2011-06-23 ザ、リージェンツ、オブ、ザ、ユニバーシティ、オブ、カリフォルニア Integrated seal for high temperature electrochemical devices
JP2016207630A (en) * 2015-04-24 2016-12-08 株式会社村田製作所 Metal support solid oxide fuel cell and manufacturing method therefor
JP2020181763A (en) * 2019-04-26 2020-11-05 日産自動車株式会社 Forming method of metal support cell conjugate, and metal support cell conjugate

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008159428A (en) * 2006-12-25 2008-07-10 Nissan Motor Co Ltd Porous structure, and solid oxide fuel cell and fuel cell stack using the same
JP2009146882A (en) * 2007-10-05 2009-07-02 Topsoee Fuel Cell As Seal for fuel cell support
JP2011518416A (en) * 2008-04-18 2011-06-23 ザ、リージェンツ、オブ、ザ、ユニバーシティ、オブ、カリフォルニア Integrated seal for high temperature electrochemical devices
JP2016207630A (en) * 2015-04-24 2016-12-08 株式会社村田製作所 Metal support solid oxide fuel cell and manufacturing method therefor
JP2020181763A (en) * 2019-04-26 2020-11-05 日産自動車株式会社 Forming method of metal support cell conjugate, and metal support cell conjugate

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