JP2019200879A - Electrochemical reaction unit and electrochemical reaction cell stack - Google Patents

Abstract

To restrain performance deterioration of electricity generation unit, and to restrain breakdown of a single cell due to stress in a first direction.SOLUTION: An electrochemical reaction unit comprises a single cell, first and second interconnectors placed to face the fuel electrode and the air electrode of the single cell, respectively, a first collector member interposed between the fuel electrode and the first interconnector, and a second collector member interposed between the air electrode and the second interconnector. Furthermore, a first spacer placed in contact with the surface of the first interconnector facing part side in the first electrode facing part of the first collector member, and a second spacer placed in contact with the surface of the second interconnector facing part side in the second electrode facing part of the second collector member are provided. The fuel electrode contains Ni, the first spacer is formed of a metallic substance, and the second spacer is formed of mica.SELECTED DRAWING: Figure 6

Description

  The technology disclosed herein relates to electrochemical reaction units.

  A solid oxide fuel cell (hereinafter referred to as “SOFC”) is known as one type of fuel cell that generates electricity using an electrochemical reaction between hydrogen and oxygen. A fuel cell power generation unit (hereinafter referred to as “power generation unit”), which is a constituent unit of SOFC, includes a fuel cell single cell (hereinafter referred to as “single cell”). The single cell includes an electrolyte layer and two electrodes (an air electrode and a fuel electrode) facing each other in a predetermined direction with the electrolyte layer interposed therebetween.

  In addition, the power generation unit is disposed between the interconnector and the electrode so as to prevent mixing of the reaction gas while ensuring electrical connection with another adjacent power generation unit, and electrically connects the two. A metal current collecting member. The current collecting member includes an interconnector facing portion electrically connected to the interconnector, and an electrode facing portion electrically connected to the electrode. The power generation unit further includes a spacer disposed so as to be in contact with the surface on the interconnector facing portion side in the electrode facing portion (see, for example, Patent Document 1).

  In addition, in a power generation unit, a technique is known in which a rigid spacer is disposed so as to be in contact with a current collecting member disposed between an interconnector and an air electrode (see, for example, Patent Document 2).

JP 2014-26974 A JP 2007-35498 A

  The power generation unit may include a spacer formed of mica that can relieve the stress in order to suppress damage to the single cell when stress in the first direction is generated in the power generation unit. preferable. However, the Si compound may be released or diffused from the spacer formed of mica, and this Si compound may adhere to the fuel electrode and contaminate the fuel electrode. When Ni contained in the fuel electrode is poisoned by a substance such as Si that pollutes the fuel electrode (hereinafter also referred to as “pollutant”), the performance of the power generation unit may be reduced. For this reason, in the power generation unit in which the fuel electrode includes Ni, it is difficult to suppress the deterioration of the performance of the power generation unit while suppressing the single cell from being damaged by the stress in the first direction. There is.

  Such a problem is not limited to a fuel cell power generation unit, but is a constituent unit of a solid oxide electrolytic cell (hereinafter referred to as “SOEC”) that generates hydrogen using an electrolysis reaction of water. This is a problem common to electrolytic cell units. In the present specification, the fuel cell power generation unit and the electrolysis cell unit are collectively referred to as an electrochemical reaction unit. Such a problem is not limited to the solid oxide form, but is common to other types of electrochemical reaction units.

  In this specification, the technique which can solve the subject mentioned above is disclosed.

  The technology disclosed in the present specification can be realized as, for example, the following forms.

(1) An electrochemical reaction unit disclosed in the present specification includes an electrochemical reaction unit cell including an electrolyte layer and an air electrode and a fuel electrode facing each other in a first direction with the electrolyte layer interposed therebetween; A first interconnector disposed to face the fuel electrode of the chemical reaction unit cell; a second interconnector disposed to face the air electrode of the electrochemical reaction unit cell; and the fuel. A conductive first current collector disposed between a pole and the first interconnector, the first interconnector facing portion being electrically connected to the first interconnector; A first cell facing electrode facing portion electrically connected to the fuel electrode; a first connecting portion connecting the first interconnector facing portion and the first cell facing portion electrode facing portion; A first current collecting member comprising: An electrochemical reaction unit comprising: a first spacer disposed so as to contact a surface of the first current collector facing electrode side of the first current collecting member facing the first interconnector facing portion; A conductive second current collecting member disposed between the air electrode and the second interconnector, and facing the second interconnector electrically connected to the second interconnector A second cell connecting portion, a second cell facing portion electrode facing portion electrically connected to the air electrode, and a second interconnecting portion connecting the second interconnector facing portion and the second cell facing portion electrode facing portion. A second current collecting member, and a surface of the second current collecting member facing the second interconnector facing portion in the second cell facing portion electrode facing portion of the second current collecting member. A second spacer, Serial fuel electrode contains Ni, the first spacer is formed from a metallic material, the second spacer is formed from mica. According to the present electrochemical reaction unit, the fuel electrode contains Ni, and the first spacer in contact with the first current collecting member disposed between the fuel electrode and the first interconnector is a metal. Formed from material. For this reason, even when a material containing Ni is used as the fuel electrode, the first spacer does not volatilize the pollutant that contaminates the fuel electrode, so that poisoning of the fuel electrode can be suppressed. . In the electrochemical reaction unit, the second spacer is formed from mica. For this reason, when stress in the first direction is generated in the electrochemical reaction unit, it is possible to suppress damage (cracking, etc.) of the electrochemical reaction unit cell by relaxing the stress by the second spacer. it can. Therefore, according to this electrochemical reaction unit, the performance degradation of the electrochemical reaction power generation unit can be suppressed, and the electrochemical reaction unit cell can be prevented from being damaged by the stress in the first direction. .

(2) The electrochemical reaction unit further includes a fuel electrode side frame member in which a fuel chamber hole forming a fuel chamber facing the fuel electrode is formed, wherein the fuel electrode side frame member is It is good also as a structure formed from the metal material of the same kind as the metal material which forms one spacer. According to the present electrochemical reaction unit, the thermal expansion coefficient of the first spacer and the thermal expansion coefficient of the fuel electrode side frame member in the first direction can be made substantially equal, and the difference in thermal expansion coefficient between the two is It is possible to suppress the electrochemical reaction single cell from being damaged.

(3) The electrochemical reaction unit further includes an air electrode side frame member having an air chamber hole forming an air chamber facing the air electrode, wherein the air electrode side frame member is made of mica. It is good also as the structure currently formed. According to this electrochemical reaction unit, the thermal expansion coefficient of the second spacer and the thermal expansion coefficient of the air electrode side frame member in the first direction can be made substantially equal, and the difference between the two thermal expansion coefficients It is possible to suppress the electrochemical reaction single cell from being damaged.

(4) In the electrochemical reaction unit, at least a part of the first spacer may overlap with at least a part of the second spacer in the first direction view. According to this electrochemical reaction unit, when assembling a plurality of electrochemical reaction units to form an electrochemical reaction cell stack, or during operation of the electrochemical reaction cell stack, the fuel electrode side spacer and The stress is concentrated on the portion where the air electrode side spacer is not opposed, and thus the electrochemical reaction unit cell is damaged, thereby reducing the occurrence of degradation of the performance of the electrochemical reaction unit. Further, stress is applied to the overlapping portion of the fuel electrode side spacer and the air electrode side spacer, so that the electrochemical reaction single cell and the first current collecting member, and the electrochemical reaction single cell and the second Good adhesion to the current collecting member is realized.

  Note that the technology disclosed in this specification can be realized in various forms, for example, an electrochemical reaction unit (a fuel cell power generation unit or an electrolysis cell unit), and an electricity provided with a plurality of electrochemical reaction units. It can be realized in the form of a chemical reaction cell stack (fuel cell stack or electrolytic cell stack), a manufacturing method thereof, and the like.

1 is a perspective view showing an external configuration of a fuel cell stack 100 in the present embodiment. It is explanatory drawing which shows the XZ cross-section structure of the fuel cell stack 100 in the position of II-II of FIG. FIG. 3 is an explanatory diagram showing an XZ cross-sectional configuration of a fuel cell stack 100 at a position of III-III in FIG. 1. It is explanatory drawing which shows XZ cross-section structure of the two electric power generation units 102 adjacent to each other in the same position as the cross section shown in FIG. It is explanatory drawing which shows the XZ cross-section structure of the two electric power generation units 102 adjacent to each other in the same position as the cross section shown in FIG. It is explanatory drawing which shows the YZ cross-section structure of the two electric power generation units 102 mutually adjacent in the position of VI-VI of FIG. 7 and FIG. It is explanatory drawing which shows XY cross-sectional structure of the electric power generation unit 102 in the position of VII-VII of FIGS. It is explanatory drawing which shows the XY cross-section structure of the electric power generation unit 102 in the position of VIII-VIII of FIGS. It is explanatory drawing which shows roughly the structure of the air electrode side current collection member 134 in a modification.

A. First embodiment:
A-1. Device configuration:
(Configuration of fuel cell stack 100)
FIG. 1 is a perspective view showing an external configuration of a fuel cell stack 100 in the present embodiment, and FIG. 2 is a diagram of the fuel cell stack 100 at a position II-II in FIG. 1 (and FIGS. 7 and 8 described later). FIG. 3 is an explanatory diagram showing the XZ cross-sectional configuration, and FIG. 3 is an explanatory diagram showing the XZ cross-sectional configuration of the fuel cell stack 100 at the position III-III in FIG. 1 (and FIGS. 7 and 8 described later). In each figure, XYZ axes orthogonal to each other for specifying the direction are shown. In this specification, for the sake of convenience, the positive direction of the Z axis is referred to as the upward direction, and the negative direction of the Z axis is referred to as the downward direction. However, the fuel cell stack 100 is actually different from such an orientation. It may be installed. The same applies to FIG. In this specification, a direction perpendicular to the Z-axis direction is referred to as a plane direction.

  The fuel cell stack 100 includes a plurality (seven in this embodiment) of fuel cell power generation units (hereinafter simply referred to as “power generation units”) 102 and a pair of end plates 104 and 106. The seven power generation units 102 are arranged side by side in a predetermined arrangement direction (vertical direction in the present embodiment). The pair of end plates 104 and 106 are arranged so as to sandwich an assembly composed of seven power generation units 102 from above and below. The arrangement direction (vertical direction) corresponds to the first direction in the claims.

  As shown in FIG. 1, each layer (each power generation unit 102, end plates 104, 106) constituting the fuel cell stack 100 penetrates each layer vertically in the periphery of four corners around the Z-axis direction. Holes are formed, and holes corresponding to each other formed in each layer communicate with each other in the vertical direction to constitute a bolt hole 109 extending in the vertical direction from one end plate 104 to the other end plate 106. Bolts 22 are inserted into the respective bolt holes 109, and the fuel cell stack 100 is fastened by the respective bolts 22 and nuts (not shown).

  As shown in FIGS. 1 to 3, a hole penetrating each power generation unit 102 in the vertical direction is formed near the outer periphery of each power generation unit 102 around the Z-axis direction. The holes corresponding to each other are communicated in the vertical direction to form a communication hole 108 extending in the vertical direction across the plurality of power generation units 102. In the following description, a hole formed in each power generation unit 102 to configure the communication hole 108 may also be referred to as the communication hole 108.

  As shown in FIG. 1 and FIG. 2, the fuel cell stack 100 is located in the vicinity of one side (side on the X axis positive direction side of two sides parallel to the Y axis) on the outer periphery around the Z axis direction. The communication hole 108 is supplied with an oxidant gas OG from the outside of the fuel cell stack 100, and an oxidant gas introduction manifold 161 serving as a gas flow path for supplying the oxidant gas OG to an air chamber 166 described later of each power generation unit 102. The communication hole 108 located near the opposite side of the side (the side on the negative X-axis side of the two sides parallel to the Y-axis) extends from the air chamber 166 of each power generation unit 102. It functions as an oxidant gas discharge manifold 162 that is a gas flow path for discharging the oxidant off-gas OOG that is the discharged gas to the outside of the fuel cell stack 100. For example, air is used as the oxidant gas OG.

  Further, as shown in FIGS. 1 and 3, in the vicinity of the side that forms the outer periphery of the fuel cell stack 100 around the Z-axis direction, the side closest to the communication hole 108 that functions as the oxidant gas discharge manifold 162 described above. The other communication hole 108 located in is provided with a fuel gas introduction, which is a gas passage through which the fuel gas FG is introduced from the outside of the fuel cell stack 100 and supplies the fuel gas FG to a fuel chamber 176 described later of each power generation unit 102. The other communication hole 108 that functions as the manifold 171 and is located near the side closest to the communication hole 108 that functions as the oxidant gas introduction manifold 161 described above is gas discharged from the fuel chamber 176 of each power generation unit 102. As a fuel gas discharge manifold 172 that is a gas flow path for discharging a certain fuel off-gas FOG to the outside of the fuel cell stack 100 To function. As the fuel gas FG, for example, hydrogen-rich gas obtained by reforming city gas is used.

(Configuration of end plates 104 and 106)
The pair of end plates 104 and 106 are substantially rectangular flat plate-shaped conductive members, and are formed of, for example, stainless steel. One end plate 104 is disposed on the upper side of the power generation unit 102 located on the uppermost side, and the other end plate 106 is disposed on the lower side of the power generation unit 102 located on the lowermost side. A plurality of power generation units 102 are held in a pressed state by a pair of end plates 104 and 106. The upper end plate 104 functions as a positive output terminal of the fuel cell stack 100, and the lower end plate 106 functions as a negative output terminal of the fuel cell stack 100. As shown in FIGS. 2 and 3, four passage through holes 107 are formed in the lower end plate 106. The four flow passage through holes 107 communicate with the oxidant gas introduction manifold 161, the oxidant gas discharge manifold 162, the fuel gas introduction manifold 171, and the fuel gas discharge manifold 172, respectively.

(Configuration of gas passage member 27 and the like)
As shown in FIGS. 2 and 3, the fuel cell stack 100 further includes four gas passages arranged on the opposite side (that is, the lower side) of the plurality of power generation units 102 with respect to the lower end plate 106. A member 27 is provided. The four gas passage members 27 are respectively arranged at positions that overlap the oxidant gas introduction manifold 161, the oxidant gas discharge manifold 162, the fuel gas introduction manifold 171, and the fuel gas discharge manifold 172 in the vertical direction. Each gas passage member 27 has a main body portion 28 in which a hole communicating with the flow passage through hole 107 of the lower end plate 106 is formed, and a cylindrical branch portion 29 branched from the side surface of the main body portion 28. doing. The hole of the branch part 29 communicates with the hole of the main body part 28. A gas pipe (not shown) is connected to the branch portion 29 of each gas passage member 27. An insulating sheet 26 is disposed between the main body 28 of each gas passage member 27 and the end plate 106. The insulating sheet 26 is made of, for example, a mica sheet, a ceramic fiber sheet, a ceramic powder sheet, a glass sheet, a glass ceramic composite agent, or the like.

(Configuration of power generation unit 102)
4 is an explanatory diagram showing an XZ cross-sectional configuration of two power generation units 102 adjacent to each other at the same position as the cross section shown in FIG. 2, and FIG. 5 is adjacent to each other at the same position as the cross section shown in FIG. 6 is an explanatory diagram showing an XZ cross-sectional configuration of two power generation units 102, and FIG. 6 is an explanatory diagram showing a YZ cross-sectional configuration of two power generation units 102 adjacent to each other at a position VI-VI in FIGS. 7 and 8 described later. It is. 7 is an explanatory diagram showing an XY cross-sectional configuration of the power generation unit 102 at the position VII-VII in FIGS. 4 to 6, and FIG. 8 is a power generation unit at the position VIII-VIII in FIGS. 4 to 6. It is explanatory drawing which shows XY cross-section structure of 102. FIG.

  As shown in FIGS. 4 to 6, the power generation unit 102 includes a single cell 110, a separator 120, an air electrode side frame member 130, an air electrode side current collecting member 134, a fuel electrode side frame member 140, and a fuel. A pole-side current collecting member 144 and a pair of interconnectors 150 constituting the uppermost layer and the lowermost layer of the power generation unit 102 are provided. In the separator 120, the air electrode side frame member 130, the fuel electrode side frame member 140, and the peripheral portion around the Z-axis direction in the interconnector 150, the communication holes 108 functioning as the manifolds 161, 162, 171, and 172 described above are formed. And holes constituting each bolt hole 109 are formed.

  Specifically, the pair of interconnectors 150 is disposed so as to face the first interconnector 151 disposed so as to face the fuel electrode 116 in the power generation unit 102 and the air electrode 114 in the power generation unit 102. The second interconnector 152 is configured. Hereinafter, the first interconnector 151 and the second interconnector 152 may be simply referred to as an interconnector 150 when it is not necessary to distinguish between them. The interconnector 150 is a substantially rectangular flat plate-shaped conductive member larger than the single cell 110 as viewed in the Z-axis direction, and is formed of, for example, ferritic stainless steel. The interconnector 150 ensures electrical continuity between the power generation units 102 and prevents reaction gas from being mixed between the power generation units 102. In this embodiment, when two power generation units 102 are arranged adjacent to each other, one interconnector 150 is shared by two adjacent power generation units 102. That is, the first interconnector 151 in a power generation unit 102 is the same member as the second interconnector 152 in another power generation unit 102 adjacent to the fuel electrode 116 side (lower side) of the power generation unit 102. Further, since the fuel cell stack 100 includes the pair of end plates 104 and 106, the power generation unit 102 located at the top in the fuel cell stack 100 does not include the upper interconnector 150 and is located at the bottom. The power generation unit 102 does not include the lower interconnector 150 (see FIGS. 2 and 3).

  The unit cell 110 includes an electrolyte layer 112, and an air electrode (cathode) 114 and a fuel electrode (anode) 116 that face each other in the vertical direction (the arrangement direction in which the power generation units 102 are arranged) with the electrolyte layer 112 interposed therebetween. The single cell 110 of the present embodiment is a fuel electrode-supported single cell that supports the electrolyte layer 112 and the air electrode 114 with the fuel electrode 116.

  The electrolyte layer 112 is a substantially rectangular flat plate member as viewed in the Z-axis direction, and is a dense layer. The electrolyte layer 112 is formed of a solid oxide such as YSZ (yttria stabilized zirconia), ScSZ (scandia stabilized zirconia), SDC (samarium doped ceria), GDC (gadolinium doped ceria), perovskite oxide, and the like. Yes. The air electrode 114 is a substantially rectangular flat plate-shaped member smaller than the electrolyte layer 112 when viewed in the Z-axis direction, and is a porous layer. The air electrode 114 is made of, for example, a perovskite oxide (for example, LSCF (lanthanum strontium cobalt iron oxide), LSM (lanthanum strontium manganese oxide), LNF (lanthanum nickel iron)). The fuel electrode 116 is a substantially rectangular flat plate member having substantially the same size as the electrolyte layer 112 as viewed in the Z-axis direction, and is a porous layer. The fuel electrode 116 is formed of, for example, a cermet made of Ni and oxide ion conductive ceramic particles (for example, YSZ). Thus, the single cell 110 (power generation unit 102) of the present embodiment is a solid oxide fuel cell (SOFC) that uses a solid oxide as an electrolyte.

  The separator 120 is a frame-like member in which a substantially rectangular hole 121 penetrating in the vertical direction is formed near the center, and is made of a metal material such as stainless steel, for example. The peripheral part of the hole 121 in the separator 120 is opposed to the peripheral part of the surface of the electrolyte layer 112 on the air electrode 114 side. The separator 120 is bonded to the electrolyte layer 112 (single cell 110) by a bonding portion 124 formed of a brazing material (for example, Ag brazing) disposed in the facing portion. The separator 120 divides the air chamber 166 facing the air electrode 114 and the fuel chamber 176 facing the fuel electrode 116, and gas leaks from one electrode side to the other electrode side in the peripheral portion of the single cell 110. It is suppressed. A seal member (for example, a glass seal member) that seals between the air chamber 166 and the fuel chamber 176 may be further provided in the vicinity of the joint portion between the single cell 110 and the separator 120.

  As shown in FIGS. 4 to 7, the air electrode side frame member 130 is a frame-like member in which a substantially rectangular air chamber hole 131 penetrating in the vertical direction is formed near the center. The air electrode side frame member 130 is formed of mica that is an insulator. The air electrode side frame member 130 is in contact with the peripheral edge of the surface of the separator 120 opposite to the side facing the electrolyte layer 112 and the peripheral edge of the surface of the interconnector 150 facing the air electrode 114. Yes. An air chamber 166 facing the air electrode 114 is configured by the air chamber hole 131 formed in the air electrode side frame member 130. Further, the pair of interconnectors 150 included in the power generation unit 102 is electrically insulated by the air electrode side frame member 130. In addition, the air electrode side frame member 130 is connected to the oxidizing gas supply communication channel 132 that communicates the oxidizing gas introduction manifold 161 and the air chamber 166, and the oxidizing gas that communicates the air chamber 166 and the oxidizing gas discharge manifold 162. An agent gas discharge communication channel 133 is formed.

  As shown in FIGS. 4 to 6 and 8, the fuel electrode side frame member 140 is a frame-like member in which a substantially rectangular fuel chamber hole 141 penetrating in the vertical direction is formed near the center. The fuel electrode side frame member 140 is formed of a metal material such as a stainless material or an aluminum-added stainless material. The fuel electrode side frame member 140 is in contact with the peripheral portion of the surface of the separator 120 facing the electrolyte layer 112 and the peripheral portion of the surface of the interconnector 150 facing the fuel electrode 116. A fuel chamber hole 176 that faces the fuel electrode 116 is configured by the fuel chamber hole 141 formed in the fuel electrode side frame member 140. Further, the fuel electrode side frame member 140 is connected to the fuel gas supply manifold 171 and the fuel chamber 176, the fuel gas supply communication channel 142, and the fuel chamber 176 and the fuel gas discharge manifold 172. A flow path 143 is formed.

  As shown in FIGS. 4 to 6 and FIG. 8, the fuel electrode side current collecting member 144 is a conductive member disposed between the interconnector 150 and the fuel electrode 116 of the single cell 110, for example, nickel or It is made of a metal such as a nickel alloy foil or mesh. The fuel electrode side current collecting member 144 is in contact with the surface of the fuel electrode 116 opposite to the side facing the electrolyte layer 112 and the surface of the interconnector 150 facing the fuel electrode 116. However, as described above, the lowermost power generation unit 102 in the fuel cell stack 100 does not include the lower interconnector 150, and therefore the fuel electrode side current collecting member 144 in the power generation unit 102 has a lower side. It is in contact with the end plate 106. The fuel electrode side current collecting member 144 has such a configuration, and electrically connects the fuel electrode 116 and the interconnector 150 (or the end plate 106). The configuration of the fuel electrode side current collecting member 144 will be described in detail later. The fuel electrode side current collecting member 144 in the present embodiment corresponds to the first current collecting member in the claims.

  The fuel electrode side current collecting member 144 and the fuel electrode 116 may be joined by a conductive joining layer. In this case, when the fuel electrode side current collecting member 144 is in contact with the surface of the fuel electrode 116. Includes a state in which the fuel electrode side current collecting member 144 and the fuel electrode 116 are in contact with each other via a bonding layer.

  As shown in FIGS. 4 to 7, the air electrode side current collecting member 134 is a conductive member disposed between the interconnector 150 and the air electrode 114 of the single cell 110, such as ferritic stainless steel. It is made of metal. The air electrode side current collecting member 134 includes a surface of the air electrode 114 opposite to the side facing the electrolyte layer 112 and a surface of the interconnector 150 facing the air electrode 114 (in other words, the interconnector 150 of the interconnector 150). Of the surface, the fuel electrode side current collecting member 144 is in contact with one surface (the upper surface in the present embodiment) opposite to the other surface (the lower surface). However, as described above, the uppermost power generation unit 102 in the fuel cell stack 100 does not include the upper interconnector 150, and therefore the air electrode side current collecting member 134 in the power generation unit 102 includes the upper end plate. 104 is in contact. The air electrode side current collecting member 134 has such a configuration, and electrically connects the air electrode 114 and the interconnector 150 (or the end plate 104). The configuration of the air electrode side current collecting member 134 will be described in detail later. The air electrode side current collecting member 134 in the present embodiment corresponds to the second current collecting member in the claims.

In the present embodiment, the air electrode side current collecting member 134 and the air electrode 114 are bonded by the conductive bonding layer 138. The bonding layer 138 is formed of, for example, a spinel oxide such as Mn ₂ CoO ₄ , MnCo ₂ O ₄ , ZnCo ₂ O ₄ , ZnMnCoO ₄ , or CuMn ₂ O ₄ . The bonding layer 138 is formed, for example, by printing the bonding layer paste on the air electrode side current collecting member 134 and firing the bonding layer paste against the surface of the air electrode 114 under a predetermined condition. can do. In this specification, when the air electrode side current collecting member 134 is in contact with the surface of the air electrode 114, the air electrode side current collecting member 134 and the air electrode 114 are in contact with each other via a bonding layer 138 that bonds the air electrode side current collecting member 134 and the air electrode 114. including.

  As described above, in the present embodiment, since one interconnector 150 is shared by two adjacent power generation units 102, when attention is paid to one interconnector 150, one side of the interconnector 150 (for example, The fuel electrode side current collecting member 144 located on the upper surface is electrically connected to the fuel electrode 116 of the single cell 110 constituting one power generation unit 102, and the other side of the interconnector 150 (for example, The air electrode side current collecting member 134 located on the lower surface is electrically connected to the air electrode 114 of the single cell 110 constituting the other power generation unit 102.

A-2. Operation of the fuel cell stack 100:
As shown in FIGS. 2, 4, and 7, the oxidant gas is connected through a gas pipe (not shown) connected to the branch portion 29 of the gas passage member 27 provided at the position of the oxidant gas introduction manifold 161. When the OG is supplied, the oxidant gas OG is supplied to the oxidant gas introduction manifold 161 through the branch portion 29 of the gas passage member 27, the main body portion 28, and the flow path through hole 107 of the lower end plate 106. And is supplied from the oxidant gas introduction manifold 161 to the air chamber 166 through the oxidant gas supply communication channel 132 of each power generation unit 102. Further, as shown in FIGS. 3, 5, and 8, the fuel gas is connected through a gas pipe (not shown) connected to the branch portion 29 of the gas passage member 27 provided at the position of the fuel gas introduction manifold 171. When FG is supplied, the fuel gas FG is supplied to the fuel gas introduction manifold 171 through the branch portion 29 of the gas passage member 27, the main body portion 28, and the flow passage through hole 107 of the lower end plate 106. Then, the fuel gas is supplied from the fuel gas introduction manifold 171 to the fuel chamber 176 via the fuel gas supply communication channel 142 of each power generation unit 102.

  When the oxidant gas OG is supplied to the air chamber 166 of each power generation unit 102 and the fuel gas FG is supplied to the fuel chamber 176, oxygen contained in the oxidant gas OG and hydrogen contained in the fuel gas FG in the single cell 110. Power is generated by an electrochemical reaction. This power generation reaction is an exothermic reaction. As will be described later, in each power generation unit 102, the air electrode 114 of the single cell 110 is electrically connected to one interconnector 150 via the air electrode side current collecting member 134, and the fuel electrode 116 is connected to the fuel electrode side current collector. It is electrically connected to the other interconnector 150 via the member 144. The plurality of power generation units 102 included in the fuel cell stack 100 are electrically connected in series. Therefore, electrical energy generated in each power generation unit 102 is taken out from the end plates 104 and 106 that function as output terminals of the fuel cell stack 100. Since SOFC generates power at a relatively high temperature (for example, 700 ° C. to 1000 ° C.), the fuel cell stack 100 is heated by a heater (after the start-up until the high temperature can be maintained by the heat generated by the power generation. (Not shown).

  The oxidant off-gas OOG discharged from the air chamber 166 of each power generation unit 102 is discharged to the oxidant gas discharge manifold 162 via the oxidant gas discharge communication channel 133 as shown in FIGS. Further, it is connected to the branch portion 29 via the flow passage through hole 107 of the lower end plate 106 and the main body portion 28 and the branch portion 29 of the gas passage member 27 provided at the position of the oxidant gas discharge manifold 162. It is discharged to the outside of the fuel cell stack 100 through the gas pipe (not shown). Further, the fuel off-gas FOG discharged from the fuel chamber 176 of each power generation unit 102 is discharged to the fuel gas discharge manifold 172 via the fuel gas discharge communication channel 143 as shown in FIGS. 3, 5 and 8. Further, the flow passage through hole 107 of the lower end plate 106 and the main body portion 28 and the branch portion 29 of the gas passage member 27 provided at the position of the fuel gas discharge manifold 172 are connected to the branch portion 29. The gas is discharged outside the fuel cell stack 100 through a gas pipe (not shown).

  In each power generation unit 102 constituting the fuel cell stack 100 of the present embodiment, the main flow direction of the oxidant gas OG in the air chamber 166 (as shown in FIG. 7, from the X axis positive direction side to the X axis negative direction side). ) And the main flow direction of the fuel gas FG in the fuel chamber 176 (the direction from the X-axis negative direction side to the X-axis positive direction side as shown in FIG. 8) are substantially opposite directions (directions facing each other). ). That is, the power generation unit 102 (fuel cell stack 100) of this embodiment is a counter flow type SOFC.

A-3. Detailed configuration of fuel electrode side current collecting member 144:
Next, the detailed configuration of the fuel electrode side current collecting member 144 will be described. As shown in FIGS. 4 to 6 and 8, the fuel electrode side current collecting member 144 includes an interconnector facing portion 146, a plurality of fuel electrode facing portions 145, and a plurality of connecting portions 147.

  The interconnector facing portion 146 of the fuel electrode side current collecting member 144 is a plate-like portion that is in contact with the surface of the interconnector 150 (or the end plate 106, hereinafter the same) facing the fuel electrode 116. The interconnector facing portion 146 is formed with a plurality of through holes 40 penetrating the interconnector facing portion 146 in the thickness direction (that is, extending in the Z-axis direction). The interconnector facing portion 146 of the fuel electrode side current collecting member 144 corresponds to the first interconnector facing portion in the claims.

  Each fuel electrode facing portion 145 of the fuel electrode side current collecting member 144 is in contact with the surface of the fuel electrode 116 opposite to the side facing the electrolyte layer 112 and is electrically connected to the fuel electrode 116. Part. The shape of each fuel electrode facing portion 145 when viewed in the Z-axis direction is substantially rectangular. Further, the plurality of fuel electrode facing portions 145 are arranged in a lattice shape along the X direction and the Y direction as viewed in the Z-axis direction. Each fuel electrode facing portion 145 is disposed so as to overlap with the interconnector facing portion 146 in the Z-axis direction. The end 43 on the Y-axis negative direction side of each fuel electrode facing portion 145 is a free end. The fuel electrode facing portion 145 of the fuel electrode side current collecting member 144 corresponds to a first electrode facing portion in the claims.

  Each connecting portion 147 of the fuel electrode side current collecting member 144 is a plate that connects the end portion 42 of each fuel electrode facing portion 145 on the Y axis negative direction side and the end portion 41 facing the through hole 40 in the interconnector facing portion 146. It is a shaped part. The connecting portion 147 of the fuel electrode side current collecting member 144 corresponds to the first connecting portion in the claims.

  The fuel electrode side current collecting member 144 having such a configuration is completed by punching a flat plate material for producing the fuel electrode side current collecting member 144, for example, as shown in the partial enlarged view in FIG. In the state, each fuel electrode facing portion is formed by making cuts in three sides of each rectangular region that becomes each fuel electrode facing portion 145 and each connecting portion 147 and then bending the flat plate material after the punching process. 145 and each connecting portion 147 can be formed. In addition, in the partial enlarged view in FIG. 8, in order to show the manufacturing method of the fuel electrode side current collection member 144, the state before a bending process is partially shown.

  A fuel electrode side spacer 149 is disposed between each fuel electrode facing portion 145 and the interconnector facing portion 146 of the fuel electrode side current collecting member 144. The fuel electrode side spacer 149 is formed of a metal material such as a stainless material or an aluminum-added stainless material. That is, in this embodiment, the fuel electrode side frame member 140 is formed of the same type of metal material as the fuel electrode side spacer 149. Here, the metal material forming the fuel electrode side spacer 149 is a contaminant that contaminates the fuel electrode 116 (for example, silicon (Si), phosphorus (P), boron (B), chlorine (Cl) based compounds). A metal material that does not volatilize is preferable. Moreover, it is preferable that the metal material which forms the fuel electrode side spacer 149 is a rigid metal from a viewpoint of shape maintenance. In the present specification, the rigid metal means a metal having a Young's modulus (longitudinal elastic modulus) of 100 GPa or more. Due to the presence of the fuel electrode side spacer 149, the fuel electrode side current collecting member 144 follows the deformation of the power generation unit 102 due to the temperature cycle and the reaction gas pressure fluctuation, and the fuel electrode 116 and the interconnector via the fuel electrode side current collecting member 144 are connected. Good electrical connection with 150 (or end plate 106) is maintained.

A-4. Detailed configuration of air electrode side current collecting member 134:
Next, a detailed configuration of the air electrode side current collecting member 134 will be described. As shown in FIGS. 4 to 7, the air electrode side current collecting member 134 has an interconnector facing portion 136, a plurality of air electrode facing portions 135, and a plurality of connecting portions 137.

  The interconnector facing portion 136 of the air electrode side current collecting member 134 is a plate-like portion that is in contact with the surface of the interconnector 150 (or the end plate 104, the same applies hereinafter) on the side facing the air electrode 114. The interconnector facing portion 136 is formed with a plurality of through holes 30 penetrating the interconnector facing portion 136 in the thickness direction (that is, extending in the Z-axis direction). As shown in FIG. 7, in the present embodiment, each through hole 30 formed in the interconnector facing portion 136 is a hole that is long in the X-axis direction. In the interconnector facing portion 136, the plurality of through holes 30 are arranged in the Y-axis direction. The interconnector facing portion 136 of the air electrode side current collecting member 134 corresponds to a second interconnector facing portion in the claims.

  Each air electrode facing portion 135 of the air electrode side current collecting member 134 is in contact with the surface of the air electrode 114 opposite to the side facing the electrolyte layer 112 and is electrically connected to the air electrode 114. Part. The shape of each air electrode facing portion 135 when viewed in the Z-axis direction is substantially rectangular. Further, the plurality of air electrode facing portions 135 are arranged in a lattice shape along the X direction and the Y direction as viewed in the Z-axis direction. Each air electrode facing portion 135 is disposed so as to overlap with the through hole 30 formed in the interconnector facing portion 136 in the Z-axis direction. The end 33 on the Y-axis positive direction side of each air electrode facing portion 135 is a free end. The air electrode facing portion 135 of the air electrode side current collecting member 134 corresponds to the second electrode facing portion in the claims.

  Each connecting portion 137 of the air electrode side current collecting member 134 includes an end portion 32 of each air electrode facing portion 135 on the Y axis negative direction side and an end portion 31 facing the through hole 30 in the interconnector facing portion 136. It is a plate-like part to tie. The connecting portion 137 of the air electrode side current collecting member 134 corresponds to the second connecting portion in the claims.

  The air electrode side current collecting member 134 having such a configuration is completed, for example, by punching a flat plate member for producing the air electrode side current collecting member 134 as shown in the partial enlarged view in FIG. By making holes corresponding to the outer shape of each through-hole 30 while leaving the portions that become the air electrode facing portions 135 and the connecting portions 137 in the state, and then bending the flat plate member after the holes are formed It can be manufactured by forming each air electrode facing portion 135 and each connecting portion 137.

  An air electrode side spacer 139 is disposed between each air electrode facing portion 135 of the air electrode side current collecting member 134 and the interconnector 150. The air electrode side spacer 139 is an insulator and is formed of mica that is an elastic body (elastic material). That is, in this embodiment, the air electrode side frame member 130 is formed of the same type of material as the air electrode side spacer 139. In this specification, an elastic body means a material having a Young's modulus (longitudinal elastic modulus) of less than 100 GPa. As shown in FIGS. 6 and 7, each air electrode side spacer 139 is a substantially rectangular parallelepiped member and has a shape extending from the surface of the interconnector 150 to the surface of each air electrode facing portion 135 in the Z-axis direction. It has become. A part of each air electrode side spacer 139 on the interconnector 150 side is accommodated in a through hole 30 formed in the interconnector facing portion 136 of the air electrode side current collecting member 134. Due to the presence of the air electrode side spacer 139, the air electrode side current collecting member 134 follows the deformation of the power generation unit 102 due to the temperature cycle or the reaction gas pressure fluctuation, and the air electrode 114 and the interconnector via the air electrode side current collecting member 134. Good electrical connection with 150 (or end plate 104) is maintained. Furthermore, the presence of the air electrode side spacer 139 can relieve the stress in the Z-axis direction applied to the single cell 110, and can prevent the single cell 110 from being damaged (such as cracking).

  Further, at least a part of the fuel electrode side spacer 149 overlaps with at least a part of the air electrode side spacer 139 in the Z-axis direction view, as shown in a partially enlarged view in FIG. Specifically, the surface on the air electrode side spacer 139 side of the fuel electrode side overlapping portion 149a, which is a part of the fuel electrode side spacer 149, is within the range of the symbol A as viewed in the Z-axis direction. Is overlapped with the surface on the fuel electrode side spacer 149 side of the air electrode side overlapping portion 139a.

A-5. Effects of this embodiment:
As described above, each power generation unit 102 constituting the fuel cell stack 100 of this embodiment includes the single cell 110, the first interconnector 151, the second interconnector 152, and the fuel electrode side current collecting member. 144, a fuel electrode side spacer 149, an air electrode side current collecting member 134, and an air electrode side spacer 139. The single cell 110 includes an electrolyte layer 112 and an air electrode 114 and a fuel electrode 116 that face each other in the Z-axis direction with the electrolyte layer 112 interposed therebetween. The first interconnector 151 is disposed so as to face the fuel electrode 116 of the single cell 110, and the second interconnector 152 is disposed so as to face the air electrode 114 of the single cell 110. The fuel electrode side current collecting member 144 is a conductive member disposed between the fuel electrode 116 and the first interconnector 151, and is connected to the interconnector facing portion 146, the fuel electrode facing portion 145, and the interconnector. A connecting portion 147 connecting the portion 146 and the fuel electrode facing portion 145. The interconnector facing portion 146 is electrically connected to the first interconnector 151. The fuel electrode facing portion 145 is electrically connected to the fuel electrode 116. The fuel electrode side spacer 149 is disposed so as to be in contact with the surface on the interconnector facing portion 146 side of the fuel electrode facing portion 145 of the fuel electrode side current collecting member 144. The air electrode side current collecting member 134 is a conductive member disposed between the air electrode 114 and the second interconnector 152, and is connected to the interconnector facing portion 136, the air electrode facing portion 135, and the interconnector. A connecting portion 137 connecting the portion 136 and the air electrode facing portion 135. The interconnector facing portion 136 is electrically connected to the second interconnector 152, and the air electrode facing portion 135 is electrically connected to the air electrode 114. The air electrode side spacer 139 is disposed so as to be in contact with the surface on the interconnector facing portion 136 side of the air electrode facing portion 135 of the air electrode side current collecting member 134. Further, in the power generation unit 102 of the present embodiment, the fuel electrode 116 contains Ni, the fuel electrode side spacer 149 is made of a metal material, and the air electrode side spacer 139 is made of mica. Since the power generation unit 102 of the present embodiment has the above-described configuration, as described below, the cause is that Ni contained in the fuel electrode 116 is poisoned by the pollutant (poisoning of the fuel electrode 116). The performance degradation of the power generation unit 102 can be suppressed, and damage to the single cell 110 due to the stress in the Z-axis direction can be suppressed.

  As described above, in the power generation unit 102 of the present embodiment, the fuel electrode 116 contains Ni, and the fuel electrode-side current collecting member disposed between the fuel electrode 116 and the first interconnector 151. The fuel electrode side spacer 149 in contact with 144 is made of a metal material. For this reason, even when a material containing Ni is used as the fuel electrode 116, the fuel electrode side spacer 149 does not volatilize pollutants that contaminate the fuel electrode, so that poisoning of the fuel electrode 116 is suppressed. be able to. Further, in the power generation unit 102 of the present embodiment, the air electrode side spacer 139 is formed from mica. For this reason, when stress in the Z-axis direction is generated in the power generation unit 102 of the present embodiment, it is possible to suppress damage (cracking, etc.) of the single cell 110 by relaxing the stress by the air electrode side spacer 139. it can. Therefore, according to the power generation unit 102 of this embodiment, the performance degradation of the power generation unit 102 can be suppressed, and damage to the single cell 110 due to stress in the Z-axis direction can be suppressed.

  Further, the power generation unit 102 of the present embodiment includes a fuel electrode side frame member 140 in which a fuel chamber hole 141 constituting a fuel chamber 176 facing the fuel electrode 116 is formed, and the fuel electrode side frame member 140 is a fuel electrode. The side spacer 149 is formed of the same type of metal material as that of the metal material. With this configuration, the thermal expansion coefficient of the fuel electrode side spacer 149 and the thermal expansion coefficient of the fuel electrode side frame member 140 in the Z-axis direction can be made substantially equal, and the difference between the thermal expansion coefficients of the two. It is possible to prevent the single cell 110 from being damaged due to the above.

  Further, the power generation unit 102 of the present embodiment includes an air electrode side frame member 130 in which an air chamber hole 131 forming an air chamber 166 facing the air electrode 114 is formed, and the air electrode side frame member 130 is made of mica. Is formed. By adopting such a configuration, the thermal expansion coefficient of the air electrode side spacer 139 and the thermal expansion coefficient of the air electrode side frame member 130 in the Z-axis direction can be made substantially equal, and the difference in thermal expansion coefficient between the two. It is possible to prevent the single cell 110 from being damaged due to the above.

  In the power generation unit 102 of the present embodiment, at least a part of the fuel electrode side spacer 149 overlaps at least a part of the air electrode side spacer 139 when viewed in the Z-axis direction. By adopting such a configuration, when assembling a plurality of power generation units 102 to form the fuel cell stack 100, or during operation of the fuel cell stack 100, the fuel electrode side spacer 149 and the air electrode side in the single cell 110 are used. The stress is concentrated on the portion where the spacer 139 does not face, and thereby the single cell 110 is damaged, and as a result, the deterioration of the performance of the power generation unit 102 is reduced. In addition, stress is applied to the overlapping portion of the fuel electrode side spacer 149 and the air electrode side spacer 139, so that the unit cell 110 and the fuel electrode side current collecting member 144, and the unit cell 110 and the air electrode side Good adhesion to the current collecting member 134 is realized.

B. Variations:
The technology disclosed in the present specification is not limited to the above-described embodiment, and can be modified into various forms without departing from the gist thereof. For example, the following modifications are possible.

  The configuration of the power generation unit 102 in the above embodiment is merely an example, and can be variously changed. For example, in the power generation unit 102 of the above embodiment, the configuration illustrated in FIG. 9 may be applied to the air electrode side current collecting member 134. That is, the air electrode side current collecting member 134 includes an air electrode facing portion 135, an interconnector facing portion 136, and a connecting portion 137. Specifically, the interconnector facing portion 136 of the air electrode side current collecting member 134 is a plate-like portion that is in contact with the surface of the interconnector 150 (or the end plate 104, the same applies hereinafter) facing the air electrode 114. The air electrode facing portion 135 of the air electrode side current collecting member 134 is in contact with the surface of the air electrode 114 opposite to the side facing the electrolyte layer 112 and is electrically connected to the air electrode 114. It is. The shape of each air electrode facing portion 135 when viewed in the Z-axis direction is substantially rectangular. Further, the plurality of air electrode facing portions 135 are arranged in a lattice shape along the X direction and the Y direction as viewed in the Z-axis direction. The air electrode side current collecting member 134 has two connecting portions 137 with respect to one air electrode facing portion 135. The two connecting portions 137 include a plate-like portion connecting the end 32 on the Y-axis negative direction side in the air electrode facing portion 135 and the end 31 on the Y-axis positive direction side in the interconnector facing portion 136, and the air electrode The end portion 33 on the Y-axis positive direction side in the facing portion 135 and the end portion on the Y-axis negative direction side in the interconnector facing portion 136, and an end portion (not shown) positioned substantially coaxially with the end portion 31 in the Y-axis direction. Z)). The air electrode side current collecting member 134 having such a configuration has, for example, portions that become the air electrode facing portions 135 and the connecting portions 137 in a completed state with respect to the flat plate member for producing the air electrode side current collecting member 134. Punching is performed so that the hole corresponding to the space portion 34 is formed, and then the flat plate member after punching is bent to perform each air electrode facing portion 135 and It can be manufactured by forming each connecting portion 137. At this time, the air electrode side spacer 139 is disposed between each air electrode facing portion 135 of the air electrode side current collecting member 134 and the interconnector 150.

  In the power generation unit 102 of the above embodiment, the structure of the fuel electrode side current collecting member 144 may be applied to the air electrode side current collecting member 134, and the air electrode side to the fuel electrode side current collecting member 144. The structure of the current collecting member 134 may be applied. Further, the structure of the air electrode side current collecting member 134 and the structure of the fuel electrode side current collecting member 144 may be the same or different.

  In the power generation unit 102 of the above embodiment, the same type of metal material as the metal material forming the fuel electrode side spacer 149 is applied to the fuel electrode side frame member 140. However, the present invention is not limited to this, and the fuel electrode side frame member is used. A metal material different from the metal material forming the fuel electrode side spacer 149 with respect to 140 may be applied.

  In the power generation unit 102 of the above embodiment, mica, which is the same type of material as the material forming the air electrode side spacer 139, is applied to the air electrode side frame member 130. However, the present invention is not limited to this. A material different from the material forming the air electrode side spacer 139 may be applied to the member 130.

  In the power generation unit 102 of the above-described embodiment, at least a part of the fuel electrode side spacer 149 overlaps with at least a part of the air electrode side spacer 139 when viewed in the Z-axis direction. The side spacer 149 and the air electrode side spacer 139 may be configured not to overlap in the Z-axis direction.

In the present embodiment, the air electrode side current collecting member 134 or the interconnector 150 may be covered with a conductive coat. The coat may be formed of, for example, a spinel oxide such as Mn ₂ CoO ₄ , MnCo ₂ O ₄ , ZnCo ₂ O ₄ , ZnMnCoO ₄ , or CuMn ₂ O ₄ . The formation of the coating on the air electrode side current collecting member 134 can be performed by a known method such as spray coating, ink jet printing, spin coating, dip coating, plating, sputtering, or thermal spraying. Due to the presence of the coat, the release and diffusion of contaminants (for example, Cr) contained in the air electrode side current collecting member 134 are suppressed, and the occurrence of poisoning of the air electrode 114 is suppressed.

  In the above embodiment, the bonding layer 138 is interposed between the air electrode side current collecting member 134 and the air electrode 114, but the bonding layer 138 is provided between the air electrode side current collecting member 134 and the air electrode 114. May not intervene.

  In the above embodiment, the bolt holes 109 are provided independently of the manifold communication holes 108. However, the independent bolt holes 109 are not provided, and the manifold communication holes 108 are used as bolt holes. May also be used. In the above embodiment, the counter flow type in which the main flow direction of the oxidant gas OG in the air chamber 166 and the main flow direction of the fuel gas FG in the fuel chamber 176 are substantially opposite to each other is described as an example. However, the present invention can also be applied to other types (such as a co-flow type in which the two flow directions are substantially the same direction or a cross flow type in which the two flow directions intersect).

  In the above embodiment, the number of power generation units 102 included in the fuel cell stack 100 is merely an example, and the number of power generation units 102 is appropriately determined according to the output voltage required for the fuel cell stack 100 or the like. In the above embodiment, an intermediate layer may be disposed between the air electrode 114 and the electrolyte layer 112. Moreover, the material which comprises each member in the said embodiment is an illustration to the last, and each member may be comprised with the other material.

  In the above embodiment, the SOFC that generates electricity using the electrochemical reaction between hydrogen contained in the fuel gas and oxygen contained in the oxidant gas is targeted. The present invention can be similarly applied to an electrolytic cell unit that is a constituent unit of a solid oxide electrolytic cell (SOEC) that generates hydrogen by using hydrogen, and an electrolytic cell stack including a plurality of electrolytic cell units. The configuration of the electrolytic cell stack is well known as described in, for example, Japanese Patent Application Laid-Open No. 2006-81813, and thus will not be described in detail here. However, the configuration is generally the same as that of the fuel cell stack 100 in the above-described embodiment. It is a configuration. That is, the fuel cell stack 100 in the above-described embodiment may be read as an electrolytic cell stack, the power generation unit 102 may be read as an electrolytic cell unit, and the single cell 110 may be read as an electrolytic single cell. However, when the electrolysis cell stack is operated, a voltage is applied between the two electrodes so that the air electrode 114 is positive (anode) and the fuel electrode 116 is negative (cathode). Water vapor as a source gas is supplied. As a result, an electrolysis reaction of water occurs in each electrolysis cell unit, hydrogen gas is generated in the fuel chamber 176, and hydrogen is taken out of the electrolysis cell stack through the communication hole. Also in the electrolytic cell unit and the electrolytic cell stack having such a configuration, when a configuration such as a current collecting member having the same configuration as that of the above embodiment is adopted, Ni contained in the fuel electrode 116 is poisoned by the pollutant (fuel) The performance degradation of the power generation unit 102 caused by the poisoning of the electrode 116 can be suppressed, and damage to the single cell 110 due to the stress in the Z-axis direction can be suppressed.

22: Bolt 26: Insulating sheet 27: Gas passage member 28: Body part 29: Branch part 30: Through hole 31: End part 32: End part 33: End part 34: Space part 40: Through hole 41: End part 42: End 43: End 100: Fuel cell stack 102: Fuel cell power generation unit 104: End plate 106: End plate 107: Through hole for flow path 108: Communication hole 109: Bolt hole 110: Single cell 112: Electrolyte layer 114: Air electrode 116: Fuel electrode 120: Separator 121: Hole 124: Joint part 130: Air electrode side frame member 131: Air chamber hole 132: Oxidant gas supply communication channel 133: Oxidant gas discharge communication channel 134: Air Electrode-side current collecting member 135: Air electrode facing portion 136: Interconnector facing portion 137: Connection portion 138: Bonding layer 39: Air electrode side spacer 139a: Air electrode side overlapping portion 140: Fuel electrode side frame member 141: Fuel chamber hole 142: Fuel gas supply communication channel 143: Fuel gas discharge communication channel 144: Fuel electrode side current collecting member 145: Fuel electrode facing portion 146: Interconnector facing portion 147: Connecting portion 149: Fuel electrode side spacer 149a: Fuel electrode side overlapping portion 150: Interconnector 151: First interconnector 152: Second interconnector 161: Oxidation Agent gas introduction manifold 162: Oxidant gas discharge manifold 166: Air chamber 171: Fuel gas introduction manifold 172: Fuel gas discharge manifold 176: Fuel chamber

Claims (5)

An electrochemical reaction unit cell including an electrolyte layer and an air electrode and a fuel electrode facing each other in a first direction across the electrolyte layer;
A first interconnector arranged to face the fuel electrode of the electrochemical reaction single cell;
A second interconnector arranged to face the air electrode of the electrochemical reaction single cell;
A conductive first current collecting member disposed between the fuel electrode and the first interconnector, the first interconnector facing portion being electrically connected to the first interconnector And a first electrode facing portion electrically connected to the fuel electrode, and a first connecting portion connecting the first interconnector facing portion and the first electrode facing portion, 1 current collecting member;
A first spacer disposed so as to be in contact with a surface of the first current collector member facing the first interconnector in the first electrode facing portion;
An electrochemical reaction unit comprising:
A conductive second current collecting member disposed between the air electrode and the second interconnector, wherein the second interconnector facing portion is electrically connected to the second interconnector. And a second electrode facing portion electrically connected to the air electrode, and a second connecting portion connecting the second interconnector facing portion and the second electrode facing portion, Two current collecting members;
A second spacer disposed so as to be in contact with the surface on the second interconnector facing portion side in the second electrode facing portion of the second current collecting member;
With
The fuel electrode contains Ni,
The first spacer is made of a metal material,
The second spacer is formed from mica.
An electrochemical reaction unit characterized by that. The electrochemical reaction unit according to claim 1, further comprising:
A fuel electrode side frame member in which a fuel chamber hole that constitutes a fuel chamber facing the fuel electrode is formed;
With
The fuel electrode side frame member is formed of the same metal material as that of the metal material forming the first spacer.
An electrochemical reaction unit characterized by that. The electrochemical reaction unit according to claim 1 or 2, further comprising:
An air electrode side frame member in which an air chamber hole forming an air chamber facing the air electrode is formed;
With
The air electrode side frame member is formed from mica,
An electrochemical reaction unit characterized by that. In the electrochemical reaction unit according to any one of claims 1 to 3,
In the first direction view, at least a part of the first spacer overlaps at least a part of the second spacer;
An electrochemical reaction unit characterized by that. In an electrochemical reaction cell stack comprising a plurality of electrochemical reaction units arranged side by side in the first direction,
At least one of the plurality of electrochemical reaction units is the electrochemical reaction unit according to any one of claims 1 to 4.
An electrochemical reaction cell stack characterized by that.

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