JP2008053109A - Fuel cell stack structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fuel cell stack structure which can select serial and parallel connections of single cells, that is, meet both of high voltage and high current specifications with small size and high output. <P>SOLUTION: The fuel cell stack structure comprises a stack of many cell plates 1 formed in a manner of bonding support materials 2 and 3 to the inner and outer circumferential portions of an annular single cell 10, respectively. A space between the cell plates 1, 1 overlapping with each other is formed as a gas flow path 4, and many cell plates 1 are arranged with fuel electrodes 11, 11 of the single cell 10 in opposition to each other. The inner peripheral side support material 2 and the outer peripheral side support material 3 of the cell plate 1 is electrically disconnected, and the inner peripheral side support material 2 and the outer peripheral side support material 3 of the cell plate 1 are served as connection terminals for the single cell 10. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

    The present invention relates to a fuel cell stack structure in which solid oxide fuel cells are stacked.

  Conventionally, as the fuel cell stack structure as described above, for example, a fuel cell in which flat single cells are stacked so that the same type of electrodes face each other, and a space formed between the same type of electrodes is used as a gas flow path There is a stack structure, and by arranging the current collector in the gas flow path, all the single cells are electrically connected in parallel, or the single cells that are insulated from each other are electrically connected by an external conductor. There is something.

In addition to the fuel cell stack structure described above, hollow disk-type cells having all of the outer surfaces as air electrodes and all of the inner surfaces as fuel electrodes are stacked, and different types of layers are used in each of the stacked portions. There is a fuel cell stack structure in which electrodes are in electrical contact.
Japanese Patent Application No. 7-214216 JP 2002-50390 A JP 2002-8681 A

  However, in the fuel cell stack structure described above, in the fuel cell stack structure in which the current collector is arranged in the gas flow path formed between the same type of electrodes, all the flat single cells are connected in parallel. On the other hand, a fuel cell stack structure having a configuration in which a single cell that is insulatively connected to each other is electrically connected to each other by an external conductor using a space formed between the same type of electrodes as a gas flow path Then, although either serial connection or parallel connection can be arbitrarily selected, for the convenience of carrying out electrical connection with an external conductor, when the conductor wire diameter is increased to correspond to a large current, In the case where packing is performed at a high density by narrowing the stacking interval, there is a problem that it is difficult to bring the conductor into contact with the single cell.

  In addition, in a fuel cell stack structure in which hollow disk-type cells are stacked and electrodes are arranged at the connection portions between the cells, if the electrodes are made into a thin film, the electrical resistance increases (in the case of series connection). In particular, the electrical resistance increases, and if the electrodes are thickened to avoid this, it is difficult to realize the overall miniaturization. It was an issue.

  The present invention has been made paying attention to the above-described conventional problems, and can be selected from series connection and parallel connection of single cells, that is, both high voltage specifications and large current specifications can be supported. It is an object to provide a fuel cell stack structure that is small and has high output.

  The present invention is a fuel cell stack formed by laminating a plurality of cell plates formed by joining supports to the inner peripheral edge and outer peripheral edge of a ring-shaped single cell, and forming a gas flow path between the overlapping cell plates. It is a structure, and a plurality of cell plates are arranged so that the same type of electrodes of a single cell are opposed to each other, and the inner peripheral support and the outer peripheral support of the cell plate are electrically separated from each other. The inner peripheral support body and the outer peripheral support body are both configured as connection terminals for a single cell, and the configuration of this fuel cell stack structure is a means for solving the above-described conventional problems. Yes.

  In the fuel cell stack structure of the present invention, in the overlapping cell plates, the same kind of electrodes of the single cells are made to face each other, so that a separator becomes unnecessary, and in addition, current collectors and connections arranged inside and outside between the cell plates By making electrical connection at the terminals, an increase in electrical resistance is suppressed, and as a result, miniaturization is achieved while maintaining high output.

  In addition, by selecting the contact portions of the current collectors and connection terminals arranged inside and outside between the overlapping cell plates, it is possible to easily cope with both series connection and parallel connection, and a high voltage type fuel cell Both the stack structure and the high-current type fuel cell stack structure can be easily designed.

  According to the fuel cell stack structure of the present invention, since it has the above-described configuration, it can be compatible with both high voltage specifications and large current specifications, and can achieve downsizing and high output. It has a very good effect of being possible.

  In the fuel cell stack structure of the present invention, the ring-shaped single cell is formed by forming a through-hole in the central portion of the flat plate cell, and is not limited to a circular shape, but a polygonal shape. Also included.

  Further, in the fuel cell stack structure of the present invention, a support that is joined to each of the inner peripheral edge and the outer peripheral edge of the ring-shaped single cell, that is, a support that is electrically separated from each other and serves as a connection terminal for the single cell. A material having electronic conductivity such as a metal, an alloy or a conductive oxide is used.

  Here, if the sealing property between the single cell and the support cannot be ensured, a cross leak of gas (fuel gas and oxidizing gas) occurs and power generation performance deteriorates. Therefore, a means for joining the electrolyte of the single cell having a gas separator function and the support to each other with a gas sealability (means satisfying the gas sealability or the insulation with one of the electrodes, for example, a ceramic adhesive or a glass seal) Material). At this time, it is preferable to join the electrolyte and the end of the support, but the joining structure is not limited to this as long as the joining structure can provide gas sealing properties.

  Furthermore, in the fuel cell stack structure according to the present invention, the support functions as an electrical connection terminal by contacting the current collector in contact with the electrode of the single cell. The single cells in the stacked cell plates are electrically connected by appropriately contacting a support as a connection terminal and a current collector. In other words, it is only necessary to select the contact portion between the current collector that is in contact with the electrode of the single cell and the support body as the connection terminal, and it is possible to perform either serial connection or parallel connection without the need for routing of the conducting wire or the like. It can be implemented by appropriately selecting.

  Under the present circumstances, the electrical power collector arrange | positioned between each single cell of an adjacent cell board has an insulating structure suitably. This is because the same type of electrodes facing each other must be insulated when connected in series. The insulating structure is a film of an insulating material on the surface of the current collector that does not contact the single cell. And an insulating layer such as a sheet.

  Furthermore, the fuel cell stack structure of the present invention includes a holder that supports at least a part of the cell plate support and maintains a gas flow path between the cell plates. A structure in which a gas supply hole for supplying gas to the passage can be employed, and a stack structure is formed using a holder that supports the cell plate as a laminated portion.

  The holder for supporting the cell plate can be disposed on the inner peripheral side and / or the outer peripheral side of the ring-shaped single cell, and the gas supply hole formed in the holder has gas penetrating in the stacking direction. It consists of a flow path and a horizontal gas flow path that communicates with and supplies gas to each single cell.

  The holder can be composed of one member, or composed of two or more members, and can be composed of an electron conductive material or an insulating material. it can. When the holder is made of an electron conductive material, it can function as a connection terminal together with the support. On the other hand, when the holder is made of an insulating material, each cell plate is insulated. It is also possible to laminate in a state, and it can be appropriately selected depending on the stack specification.

  Furthermore, in the fuel cell stack structure of the present invention, the holder can be configured to be located on the inner peripheral side of the single cell and support at least a part of the inner peripheral support, The structure is such that each outer peripheral support of the overlapping cell plates is joined, and a gas discharge hole for discharging gas from the gas flow path between the cell plates is provided in a holder located on the inner peripheral side of the single cell. desirable.

  Thus, when each outer peripheral side support body of the cell plate which mutually overlaps is joined, and the closed space between two cell plates is made into a gas flow path, it is located in the inner peripheral side of a single cell. After the gas is supplied from the gas supply hole of the holder to each single cell, the gas is discharged from the gas discharge hole of the holder.

  In the fuel cell stack structure having the holder for maintaining the gas flow path between the cell plates described above, since the single cells of the overlapping cell plates are arranged to face each other, only one side is used as a cell plate and Compared to the case where the other side is, for example, a separator plate, thermal expansion and contraction are made uniform on both sides, and therefore, the thermal shock resistance is excellent.

  Furthermore, in the fuel cell stack structure of the present invention, the outer peripheral support of the cell plate can be used as a connection terminal for one electrode, and the inner peripheral support can be used as a connection terminal for the other electrode.

  In this case, the same type of electrode facing the space of the gas flow path sandwiched between two overlapping cell plates is connected by a current collector disposed in this space, and this current collector is connected to the outer peripheral side support or By contacting the inner peripheral support, they are electrically connected in parallel.

  On the other hand, the same type of electrodes facing the outside of the two overlapping cell plates are electrically connected when the current collectors in contact with each other come into contact with the outer support or the inner support. . Here, when the two supports electrically connected to the outer electrode are not in contact with each other, when the electrodes are electrically connected via the holder or the current collector, the electrode disposed on the outer side is Electrically connected in parallel, whereby a pair of opposing single cells are electrically connected in parallel.

  Furthermore, in the fuel cell stack structure of the present invention, in the overlapping cell plates, the opposing supports can be electrically separated from each other, and thus the opposing supports are different from each other. If the connection terminal of the electrode is used, it is possible to perform electrical series connection only by laminating these support portions, and in this case, it is not necessary to use an insulating junction at the laminated portion.

  For example, in the case where the support is supported by a holder having a gas supply hole and laminated at the holder portion, it is necessary to perform bonding having insulating properties and gas sealability at the laminated portion, that is, limited. Although it is necessary to perform bonding with a technique and high technical hurdles, as described above, by adopting a structure in which these supporting body portions are laminated with opposing supporting bodies as connection terminals of different electrodes. Such a problem can be avoided.

  As described above, the outer peripheral side support body and the inner peripheral side support body of the cell plate are used as connection terminals for different electrodes, or the opposing support bodies of the overlapping cell plates are electrically separated from each other, A separatorless structure with a high output density is obtained, an increase in electrical resistance is suppressed, and selection between series connection and parallel connection is possible.

  Furthermore, in the fuel cell stack structure of the present invention, a set of cell plates that overlap each other with the same type of electrodes of a single cell facing each other is used as a cell unit, and adjacent cell units are electrically connected in series. By adopting this configuration, it is possible to obtain a high voltage type fuel cell stack structure that is small and has high output.

  At this time, if the outer peripheral support of the cell plate is used as a connection terminal for one electrode and the inner support is used as a connection terminal for the other electrode, the opposing connection terminals are electrically reverse-signed when connected in series. In the case of parallel connection, it is desirable that the opposite connection terminals have the same electrical sign. With such a structure, it is only necessary to arrange a current collector between the connection terminals. Therefore, it is possible to easily select and implement general series connection and parallel connection.

  And in the cell board which mutually overlaps, when the support bodies which oppose are mutually isolate | separated mutually, each single cell can be electrically connected in series via a support body.

  Furthermore, in the fuel cell stack structure of the present invention, a set of cell plates facing each other of the same type of electrodes of a single cell is used as a cell unit, and adjacent cell units are electrically connected in parallel, It is possible to have a configuration in which a plurality of these electrically connected parallel cell units are electrically connected in series. By adopting this configuration, in addition to being small and having high output, it is easy to A fuel cell stack structure capable of adjusting power can be obtained.

  At this time, it is not always necessary to unify the number of cell units connected in parallel, as long as the amount of current is balanced. In other words, if there is a part where the number of cell units connected in parallel is extremely small, the amount of generated current is limited to the limit value of the generated current in that part, which may reduce the power generation performance. As long as such a situation can be avoided, the number of cell units connected in parallel need not be unified.

  EXAMPLES Hereinafter, although an Example demonstrates this invention still in detail, specifications, such as a dimension and a material of each component, are not limited to a following example.

  1 and 2 show an embodiment of a fuel cell stack structure according to the present invention. As shown in FIG. 1, the fuel cell stack structure has a fuel electrode support that forms a ring shape (frame shape). A plurality of cell plates 1 formed by joining supports 2 and 3 to the inner peripheral edge and outer peripheral edge of a single cell 10 of a mold are laminated, and two cell plates 1, 1 overlapping each other A set of cell units U is formed. Between the two cell plates 1 and 1 in the cell unit U is formed as a fuel gas flow path 4, and between the overlapping cell units U and U is formed as an air gas flow path 5, A current collector 7 is disposed in each of the flow paths 4 and 5.

  In this case, the two cell plates 1 and 1 in the cell unit U are arranged so that the fuel electrodes 11 and 11 of each unit cell 10 face each other, and the cell plates 1 are electrically separated from each other. Both the inner periphery side support body 2 and the outer periphery side support body 3 serve as connection terminals for the single cell 10.

  Further, in this embodiment, a holder 6 for supporting the outer peripheral support 3 and maintaining the gas flow paths 4 and 5 is provided on the outer peripheral portion of the cell plate 1. A fuel gas supply / discharge hole 6 a communicating with the passage 4 is formed, and an air gas supply / discharge hole 6 b communicating with the air gas flow path 5 is formed.

  In this example, a 15 cm × 15 cm fuel electrode supporting cell (fuel electrode 11: Ni—YSZ, electrolyte 12: YSZ, air electrode side intermediate layer SDC, air electrode 13: SSC) has a through hole in the central portion 5 cm × 5 cm. As a result, a ring-shaped single cell 10 was obtained.

  Further, as the inner support 2, SUS430 having a size of 6 cm × 6 cm and a thickness of 100 μm is used, and this is joined to the inner peripheral edge of the electrolyte 12 in the ring-shaped single cell 10 by a glass sealing material. As the side support 3, SUS430 having a size of 20 cm × 20 cm and a thickness of 100 μm is used, and this is joined to the outer peripheral edge of the electrolyte 12 in the ring-shaped single cell 10 by a glass sealing material, and a single cell plate 1 was formed.

  Then, a holder 6 made of SUS430 having a fuel gas supply / discharge hole 6a and an air gas supply / discharge hole 6b is joined and fixed to the outer peripheral portion of the cell plate 1 by welding so that the fuel electrodes 11, 11 of the single cell 10 are connected to each other. The two cell plates 1 and 1 and the holder 6 are laminated so that the two face each other. At this time, a ceramic adhesive was applied and bonded to the entire surface of the laminated surface so that the laminated surfaces of the holder 6 were electrically insulated.

  The current collector 7 disposed in the fuel gas flow path 4 is made of Inconel 600, and the current collector 7 in contact with the fuel electrode 11 on the lower side of the fuel gas flow path 4 is connected to the outer periphery of the cell plate 1. The current collector 7 that is in contact with the side support 3 and is in contact with the fuel electrode 11 on the upper side surface of the fuel gas passage 4 is brought into contact with the inner peripheral side support 2 and 2 of the upper and lower cell plates 1 and 1. . At this time, the contact surfaces of the current collectors 7, 7 contacting the upper and lower fuel electrodes 11, 11 were covered with the insulating material 8 to be electrically insulated.

  On the other hand, the current collector 7 arranged outside the cell unit U is also made of Inconel 600, and the current collector 7 in contact with the lower air electrode 13 in the cell unit U is shown in the lower cell plate 1. The current collector 7 in contact with the upper air electrode 13 in the cell unit U was brought into contact with the outer peripheral side support 3 of the upper cell plate 1. Also in this case, the respective contact surfaces of the current collector 7 in contact with the air electrode 13 and the current collector 7 in contact with the air electrode 13 of the adjacent cell unit U are covered with the insulating material 8 to be electrically insulated. did.

  That is, in the above-described embodiment, as shown in FIG. 2, the lower outer support 3 and the lower holder 6 are used as connection terminals for the lower fuel electrode 11, and the lower air electrode 13 and the upper side are connected. The cell unit U is electrically connected to the fuel electrode 11 by the inner peripheral support 2 and the current collector 7, and the upper outer support 3 and the upper holder 6 are the connection terminals of the upper air electrode 13. That is, a cell unit U having an electrical series connection structure was obtained.

  By stacking the cell units U thus obtained via the holder 6, a fuel cell stack structure in which all the plurality of cell plates 1 are electrically connected in series is obtained. At this time, in order to perform electrical connection between the cell units U, a ceramic adhesive was applied and bonded only to the outer peripheral portion of the laminated surface of the holder 6.

  3 to 8 show other embodiments of the fuel cell stack structure according to the present invention. This fuel cell stack structure has a fuel electrode having a circular ring shape as shown in FIGS. A plurality of cell plates 21 formed by joining support bodies 22 and 23 to the inner peripheral edge and the outer peripheral edge of the support type single cell 30 are laminated, and each single cell is formed as shown in FIG. While holding the holder 26 between the inner peripheral supports 22 and 22 of the two cell plates 21 and 21 arranged with the 30 fuel electrodes 31 and 31 facing each other, the outer periphery of the outer supports 23 and 23 A set of cell units U is formed by joining the peripheral edges.

  In this case, a bag-bound space between the two cell plates 21 and 21 in the cell unit U is formed as the fuel gas flow path 24, and the holder 26 has a gas supply hole as shown in FIG. A gas supply channel 26a in the stacking direction constituting the gas supply channel, and a horizontal gas distribution channel 26b that communicates with the gas supply channel 26a and distributes and supplies the fuel gas to the fuel gas channel 24. A fuel gas discharge channel 26c is formed.

  As shown in FIG. 3, the air gas flow path 25 is formed between the cell units U and U that overlap each other, and the fuel gas flow path 24 and the air gas flow path between the two cell plates 21 and 21 are formed. 25, current collectors 27 are arranged respectively. Also in this embodiment, each of the inner peripheral support 22 and the outer peripheral support 23 of the cell plate 21 electrically separated from each other is a single cell 30. As a connection terminal.

  In this example, a fuel electrode supporting cell (fuel electrode 31: Ni-SDC, electrolyte 32: SDC, air electrode 33: SSC) having an outer diameter of 15 mmφ and an inner diameter of 7 mmφ was used as a single cell 30 having a ring shape.

  Further, as the inner support 22, SUS430 having an outer diameter of 8 mmφ and a thickness of 100 μm is used, and this is joined to the inner peripheral edge of the electrolyte 32 in the ring-shaped single cell 30 by a glass sealant. As the side support 23, SUS430 having an outer diameter of 20 mmφ-an inner diameter of 14 mmφ and a thickness of 100 μm was used, and this was joined to the outer peripheral edge of the electrolyte 32 in the ring-shaped single cell 30 with a glass sealing material. A cell plate 21 was formed.

  The two cell plates 21 and 21 are arranged so that the fuel electrodes 31 and 31 of the single cell 30 face each other, and have a gas supply channel 26a, a gas distribution channel 26b, and a fuel gas discharge channel 26c. While holding the holder 26 made of SUS430 between the inner peripheral supports 22, 22, the outer peripheral portions of the outer peripheral supports 23, 23 of the two cell plates 21, 21 are joined together to form a set. A cell unit U was obtained.

  Here, the current collector 27 arranged inside and outside the cell unit U is made of Inconel 600, and the connection specifications of the current collector 27 to the inner peripheral side support 22 and the outer peripheral side support 23 of the cell plate 21. Different types of cell units U were manufactured.

  In one cell unit U (the cell unit Uu located at the uppermost stage in FIG. 3), the fuel electrode of the single cell 30 via the current collector 27 located in the fuel gas flow path 24 between the two cell plates 21 and 21. 31 and 31 were electrically connected to each other, and the current collector 27 was brought into contact with the inner peripheral side supports 22 and 22 of the two cell plates 21 and 21. In addition, the air electrodes 33 and 33 of the single cell 30 were electrically connected to each other through the current collector 27 located in the air gas flow path 25 and the outer peripheral side support 23 in contact therewith.

  In the other cell unit U (cell unit Ul adjacent to the lower side of FIG. 3 of the cell unit Uu), a single cell is connected via a current collector 27 located in the fuel gas flow path 24 between the two cell plates 21 and 21. The 30 fuel electrodes 31 and 31 were electrically connected to each other, and the current collector 27 was brought into contact with the outer peripheral side supports 23 and 23 of the two cell plates 21 and 21. Further, the air electrodes 33 and 33 of the single cell 30 were electrically connected to each other through the current collector 27 located in the air gas flow path 25 and the inner peripheral side support 22 in contact therewith.

  By stacking the cell units Uu and cell units Ul thus obtained via the current collector 27, a set of stack units SU in which the cell units Uu and the cell units Ul are electrically connected in series can be obtained. At this time, the inner peripheral side support 22 of the cell unit Uu and the inner peripheral side support 22 of the cell unit Ul that are overlapped with each other are joined together by a ceramic adhesive having sealing properties and insulating properties, and the air electrode 33 of the cell unit Uu. The contact surfaces of the current collector 27 in contact with the current collector 27 and the current collector 27 in contact with the air electrode 33 of the cell unit Ul are covered with an insulating material 28 to be electrically insulated.

  That is, in the set of stack units SU described above, as shown in FIG. 8, the inner support 22 and the holder 26 of the cell unit Uu serve as connection terminals for the fuel electrode 31 of the cell unit Uu, and The inner support 22 and the holder 26 serve as connection terminals for the air electrode 33 of the cell unit Ul.

  By stacking the stack units SU obtained in this manner at the portions of the respective inner peripheral support bodies 22, a fuel cell stack structure in which a plurality of stack units SU are all electrically connected in series is obtained. At this time, in order to perform electrical connection between the stack units SU, a ceramic adhesive was applied and bonded only to the outer peripheral portion of the laminated surface of the inner peripheral support 22.

  9 and 10 show still another embodiment of the fuel cell stack structure of the present invention. As shown in FIG. 9, the fuel cell stack structure in this embodiment is the previous embodiment shown in FIG. The difference from the fuel cell stack structure in the example is that the inner periphery side support body of the cell plate 21 is used by using a holder 46 made of SUS430 holder pieces 46a and 46a that are divided into two parts in an up-and-down manner and in contact with each other. 22 and the outer peripheral side support 23 are different in the connection specifications of the current collector 27, and other configurations are the same as the fuel cell stack structure in the previous embodiment.

  In this embodiment, two cell plates 21, 21 are arranged so that the fuel electrodes 31, 31 of the single cell 30 face each other, and the holder 46 is sandwiched between the inner peripheral supports 22, 22. On the other hand, the outer peripheral edge portions of the outer peripheral side supports 23, 23 of the two cell plates 21, 21 were joined to form a set of cell units U.

  In this case, the fuel electrodes 31, 31 of the single cell 30 are electrically connected to each other via the current collector 27 located in the fuel gas flow path 24 between the two cell plates 21, 21, and this collector The electric body 27 is brought into contact with the lower inner peripheral support 22 of the inner peripheral supports 22, 22 of the two cell plates 21, 21, while the air electrodes 33, 33 of the single cell 30. Current collector 27 in contact with the outer peripheral support 23, 23 and the inner peripheral support 22 on the upper side of the inner peripheral support 22, 22 of the two cell plates 21, 21. The contact surfaces of the current collectors 27 and 27 that are adjacent to each other and contact the air electrode 33 are covered with an insulating material 28 to be electrically insulated.

  That is, in the set of cell units U described above, as shown in FIG. 10, the lower inner support 22 and the lower holder piece 46 a of the holder 46 serve as connection terminals for the fuel electrode 31, and The outer peripheral supports 23 and 23 serve as connection terminals for the air electrode 33.

  By stacking the cell units U thus obtained at the portions of the respective inner peripheral support bodies 22, a fuel cell stack structure in which a plurality of cell units U are all electrically connected in series is obtained. At this time, in order to perform electrical connection between the cell units U, the ceramic adhesive was applied and bonded only to the outer peripheral portion of the laminated surface of the inner peripheral support 22.

  11 and 12 show still another embodiment of the fuel cell stack structure of the present invention. As shown in FIG. 11, the fuel cell stack structure in this embodiment is the same as that shown in FIG. A plurality of cell units Uu and cell units Ul of the fuel cell stack structure in the embodiment are combined.

  That is, in this fuel cell stack structure, one stack unit SU1 formed by stacking two sets of cell units Uu and another stack unit SU2 formed by stacking two sets of cell units Ul are stacked on each other. Two divided stack units SUA are formed, and the divided stack units SUA and SUA are stacked together.

  In this case, in one stack unit SU1, the air electrodes 33 and 33 are electrically connected to each other by bringing the current collector 27 into contact with the outer peripheral support bodies 23 and 23 of the two cell units Uu. The fuel electrodes 31 and 31 are electrically connected to each other by bringing the current collector 27 in the cell unit Uu into contact with the inner support 22 and 22, that is, the two cell units Uu are electrically connected to each other. Are connected in parallel.

  In the other stack unit SU2, the air electrodes 33 and 33 are electrically connected to each other by bringing the current collector 27 into contact with the inner peripheral supports 22 and 22 of the two sets of cell units Ul. The fuel electrodes 31 are electrically connected to each other by bringing the current collector 27 in the cell unit Ul into contact with the outer peripheral supports 23, that is, the two cell units Ul are electrically connected to each other. Connected in parallel.

  The stack unit SU1 and the stack unit SU2 are electrically stacked by stacking the stack unit SU1 and the other stack unit SU2 obtained in this way via current collectors 27 that are in contact with the outer peripheral supports 23, 23. A set of divided stack units SUA connected in series is obtained. At this time, the inner periphery side support 22 of one stack unit SU1 and the inner periphery side support 22 of the other stack unit SU2 that are overlapped with each other are joined together by a ceramic adhesive having sealing properties and insulation properties, and one stack The contact surfaces of the current collector 27 that contacts the air electrode 33 of the unit SU1 and the current collector 27 that contacts the air electrode 33 of the other stack unit SU2 are covered with an insulating material 28 to be electrically insulated. .

  That is, in the set of divided stack units SUA, as shown in FIG. 12, the inner peripheral support 22 and the holder 26 of one stack unit SU1 serve as connection terminals for the fuel electrode 31, and the other stack unit SU2 The inner peripheral support 22 and the holder 26 serve as connection terminals for the air electrode 33.

  By stacking the two sets of divided stack units SUA obtained in this manner at the inner peripheral support 22, a fuel cell stack structure in which the two sets of divided stack units SUA are electrically connected in series is obtained. At this time, in order to electrically connect each of the divided stack units SUA, a ceramic adhesive was applied and joined only to the outer peripheral portion of the laminated surface of the inner peripheral support 22.

1 is a cross-sectional explanatory view of a fuel cell stack structure according to an embodiment of the present invention. (Example 1) FIG. 2 is a circuit explanatory diagram of the fuel cell stack structure in FIG. 1. (Example 1) FIG. 4 is a cross-sectional explanatory view of a fuel cell stack structure according to another embodiment of the present invention. (Example 2) FIG. 4 is an overall perspective explanatory view of a cell plate of the fuel cell stack structure in FIG. 3. (Example 2) FIG. 4 is an exploded perspective view of a cell unit of the fuel cell stack structure in FIG. 3. (Example 2) FIG. 4 is a cross-sectional explanatory view of a cell unit of the fuel cell stack structure in FIG. 3. (Example 2) It is plane explanatory drawing (a), ab line sectional explanatory drawing (b), and cd line sectional explanatory drawing (c) of the holder of the fuel cell stack structure in FIG. (Example 2) FIG. 4 is a circuit explanatory diagram of the fuel cell stack structure in FIG. 3. (Example 2) FIG. 6 is a cross-sectional explanatory view of a fuel cell stack structure according to still another embodiment of the present invention. (Example 3) FIG. 10 is a circuit explanatory diagram of the fuel cell stack structure in FIG. 9. (Example 3) FIG. 6 is a cross-sectional explanatory view of a fuel cell stack structure according to still another embodiment of the present invention. Example 4 FIG. 12 is a circuit explanatory diagram of the fuel cell stack structure in FIG. 11. Example 4

Explanation of symbols

1,21 cell plate
2,22 Inner peripheral support 3,23 Outer support 4,24 Fuel gas flow path single cell 5,25 Air gas flow path 6,26,46 Holder 6a, 6b Gas supply / discharge hole 10,30 Single cell 11, 31 Fuel electrode 12, 32 Electrolyte 13, 33 Air electrode 26a Gas supply channel (gas supply hole)
26b Gas distribution channel (gas supply hole)
26c Fuel gas discharge channel (gas discharge hole)

Claims (8)

A fuel cell stack structure in which a plurality of cell plates formed by bonding supports to the inner peripheral edge and outer peripheral edge of a ring-shaped single cell are stacked, and a gas flow path is formed between the overlapping cell plates. In addition, a plurality of cell plates are arranged with the same type of electrodes of a single cell facing each other, and the inner peripheral side support and the outer peripheral side support of the cell plate are electrically separated from each other to support the inner peripheral side of the cell plate A fuel cell stack structure characterized in that both the body and the outer peripheral side support are connection terminals for a single cell. Claims provided with a holder that supports at least a part of the cell plate support and maintains the gas flow path between the cell plates, and the holder is provided with a gas supply hole for supplying gas to the gas flow path between the cell plates Item 2. The fuel cell stack structure according to Item 1. The fuel cell stack structure according to claim 2, wherein the holder is located on an inner peripheral side of the single cell and supports at least a part of the inner peripheral support. The gas discharge hole which joins each outer peripheral side support body of the cell plate which mutually overlaps, and discharges the gas from the gas flow path between cell plates in the holder located in the inner peripheral side of a single cell is provided. Fuel cell stack structure. The fuel cell stack structure according to any one of claims 1 to 4, wherein the outer peripheral side support of the cell plate is used as a connection terminal for one electrode, and the inner peripheral support is used as a connection terminal for the other electrode. The fuel cell stack structure according to any one of claims 1 to 4, wherein in the overlapping cell plates, the opposing supports are electrically separated from each other. The fuel cell stack structure according to claim 5 or 6, wherein a set of cell plates that are overlapped with each other with the same type of electrodes of a single cell being used as a cell unit, and adjacent cell units are electrically connected in series. A set of cell plates that are the same type of electrodes of a single cell facing each other is used as a cell unit, and adjacent cell units are electrically connected in parallel, and a plurality of these cell units connected in parallel are electrically connected. The fuel cell stack structure according to claim 5 or 6, which is electrically connected in series.

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