JP2017107670A - Electrochemical reaction cell stack - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a current from leaking between a first conductive member and a second conductive member.SOLUTION: An electrochemical reaction cell stack comprises: a plurality of single cells that is arranged in parallel to a first direction, and includes an air electrode sandwiching electrolyte layers while facing to the first direction in each other and a fuel electrode; a flat-plate-like first conductive member that is arranged in one side of the first direction of the plurality of single cells, is electrically connected to the air electrode or the fuel electrode, and has a conductivity; a flat-plate-like insulation member that is adjacent to a first surface as a surface of the one side of the first conductive member; and a second conductive member that is adjacent to a second surface as the surface of one side of the insulation member, and has the conductivity. In the electrochemical reaction cell stack, the circumference of a third surface as the surface of the other side of the first direction of a second conductive member is positioned at the side inner than the circumference of the second surface of the insulation member over the whole circumference in a first direction view.SELECTED DRAWING: Figure 2

Description

  The technology disclosed herein relates to an electrochemical reaction cell stack.

  One type of fuel cell that generates electricity using an electrochemical reaction between hydrogen and oxygen is a solid oxide fuel cell (hereinafter referred to as “SOFC”) having an electrolyte layer containing a solid oxide. It has been. The SOFC is generally used in the form of a fuel cell stack including a plurality of single cells arranged in a predetermined direction (hereinafter referred to as “arrangement direction”). The single cell includes an electrolyte layer, and an air electrode and a fuel electrode facing each other in the arrangement direction with the electrolyte layer interposed therebetween.

  The fuel cell stack is further arranged on one side of the arrangement direction of the plurality of single cells and is electrically connected to the air electrode or the fuel electrode. A flat insulating member adjacent to one surface of the member; and a second conductive member adjacent to one surface of the insulating member. For example, the fuel cell stack includes a terminal plate having a protrusion connected to an external terminal as a first conductive member, and an insulating member is provided on one surface of the terminal plate as a second conductive member. The end plate is arranged.

JP 2003-346869 A

  Since the first conductive member is electrically connected to the air electrode or the fuel electrode, the fuel is more fuel than the second conductive member disposed on the first conductive member via the insulating member. High potential during battery stack power generation operation. In particular, in order to meet the demand for higher output, in the fuel cell stack in which a large number of single cells are arranged, the first conductive member has a particularly high potential. Thus, when the first conductive member is at a high potential, the first conductive member is disposed despite the insulating member being disposed between the first conductive member and the second conductive member. May discharge to the second conductive member and current may leak.

  Such a problem is common to an electrolytic cell stack which is a form of a solid oxide electrolytic cell (hereinafter referred to as “SOEC”) that generates hydrogen by utilizing an electrolysis reaction of water. It is. In this specification, the fuel cell stack and the electrolytic cell stack are collectively referred to as an electrochemical reaction cell stack. Such a problem is not limited to SOFC and SOEC, but is common to other types of electrochemical reaction cell stacks.

  The present specification discloses a technique capable of solving at least a part of the problems described above.

  The technology disclosed in this specification can be implemented as the following forms.

(1) The electrochemical reaction cell stack disclosed in the present specification is arranged side by side in a first direction, and an air electrode and a fuel electrode facing each other in the first direction with the electrolyte layer and the electrolyte layer interposed therebetween. A plurality of single cells each including a plurality of single cells, arranged on one side in the first direction of the plurality of single cells, electrically connected to the air electrode or the fuel electrode, and having a conductive plate shape A first conductive member, a flat insulating member adjacent to the first surface which is the one surface of the first conductive member, and a second surface which is the one surface of the insulating member. An electrochemical reaction cell stack including a conductive second conductive member adjacent to the surface of the first conductive member in the first direction as viewed in the first direction. The periphery of the third surface, which is the other surface of the It is located inside the periphery of the second surface of the wood. According to the present electrochemical reaction cell stack, at least a part of the periphery of the third surface of the second conductive member is at the same position as or outside the periphery of the second surface of the insulating member. Thus, since the spatial distance between the first conductive member and the second conductive member is long, it is possible to suppress current leakage between the first conductive member and the second conductive member. be able to.

(2) In the electrochemical reaction cell stack, the first conductive member includes a plate-shaped main body electrically connected to the air electrode or the fuel electrode, and the first main body from the main body. It is good also as a structure containing the protrusion part which protrudes in the direction which cross | intersects a direction. Since the first conductive member is a member provided with a protruding portion for outputting a current to the outside, the first conductive member is particularly likely to have a high potential. However, according to this electrochemical reaction cell stack, since the spatial distance between the first conductive member and the second conductive member is long, the first conductive member and the second conductive member Current leakage can be suppressed.

(3) In the electrochemical reaction cell stack, an outline of at least one cross section parallel to the first direction of the second conductive member is separated from the insulating member at the other end, and A connecting line connecting a parallel line parallel to one direction and an end of the third surface located inside the parallel line when viewed in the first direction and an end of the other side of the parallel line. It is good also as a composition containing a line. According to this electrochemical reaction cell stack, the peripheral edge of the third surface of the second conductive member is separated from the insulating member of the second conductive member over the entire circumference in the first direction view. Compared to the case where the peripheral edge of the portion is at the same position, it is possible to suppress the leakage of current between the first conductive member and the second conductive member while suppressing the size of the insulating member. it can.

(4) In the electrochemical reaction cell stack, the connecting line is located on a virtual straight line connecting the end of the third surface and the other end of the parallel line over the entire length or the virtual straight line. It is good also as a structure which exists in the position of the said one side more. According to the present electrochemical reaction cell stack, the gap between the first conductive member and the second conductive member is larger than when a part of the connecting line is located on the other side in the first direction from the virtual line. Therefore, it is possible to more effectively suppress the leakage of current between the first conductive member and the second conductive member.

(5) In the electrochemical reaction cell stack, the connecting line may be a straight line or an arc line connecting the end of the third surface and the other end of the parallel line. According to this electrochemical reaction cell stack, it is possible to more effectively suppress the leakage of current between the first conductive member and the second conductive member with a relatively simple shape. it can.

(6) In the electrochemical reaction cell stack, an outline of all cross sections of the second conductive member parallel to the first direction may include the parallel lines and the connecting lines. According to this electrochemical reaction cell stack, current leakage between the first conductive member and the second conductive member is suppressed while suppressing the size of the insulating member over the entire circumference. be able to.

(7) In the electrochemical reaction cell stack, an outline of at least one cross section parallel to the first direction of the second conductive member and the insulating member is the first conductive member of the second conductive member. 3, including a straight line extending in parallel with the first direction from the end of the third surface to the end of the fourth surface which is the one side surface of the second conductive member, and in the first direction view The end of the second surface of the insulating member may be located on the outer peripheral side of the electrochemical reaction cell stack with respect to the straight line. According to this electrochemical reaction cell stack, current leakage between the first conductive member and the second conductive member is suppressed while suppressing the complexity of the shape of the second conductive member. can do.

(8) In the electrochemical reaction cell stack, the first conductive member, the insulating member, and the second conductive member are formed with through holes that form a gas flow path. In the direction view, at least one side of each of the first conductive member, the insulating member, and the second conductive member may be in the same position. According to the electrochemical reaction cell stack, at least one side of each of the first conductive member, the insulating member, and the second conductive member is aligned, so that the first conductive member, the insulating member, and It is possible to suppress the positional relationship between the second conductive member and the positional relationship between the through holes of the first conductive member, the insulating member, and the second conductive member from shifting.

  The technology disclosed in the present specification can be realized in various forms. For example, an electrochemical reaction cell stack (a fuel cell stack or an electrolytic cell stack) including a plurality of electrochemical reaction single cells, It can be realized in the form of its manufacturing method.

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 a YZ 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 YZ 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 a schematic diagram of the sample 200 used for an insulation test. It is a graph which shows the result of the insulation test done using sample 200. It is the elements on larger scale of the terminal plate 18, the insulating material 58, and the 2nd end plate 106 in a modification.

A. Embodiment:
A-1. Constitution:
(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 an explanatory diagram showing an XZ cross-sectional configuration of the fuel cell stack 100 at a position II-II in FIG. FIG. 3 is an explanatory diagram showing a YZ cross-sectional configuration of the fuel cell stack 100 at the position of III-III in FIG. 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. It may be installed. The same applies to FIG.

  The fuel cell stack 100 includes a plurality (seven in this embodiment) of power generation units 102, a first end plate 104, a second end plate 106, and a terminal plate 18. The seven power generation units 102 are arranged side by side in a predetermined arrangement direction (in this embodiment, the vertical direction (Z-axis direction)). The terminal plate 18 is disposed on the lower side of the power generation unit 102 located at the lowest position. The first end plate 104 is disposed on the upper side of the uppermost power generation unit 102, and the second end plate 106 is disposed on the lower side of the terminal plate 18. The arrangement direction (vertical direction) corresponds to the first direction in the claims.

  A plurality of (this embodiment) penetrates in the vertical direction in the peripheral portion around the Z direction of each layer (power generation unit 102, first and second end plates 104, 106, terminal plate 18) constituting the fuel cell stack 100. 8) holes are formed, and the corresponding holes formed in each layer communicate with each other in the vertical direction, and through holes 108 extending in the vertical direction from the first end plate 104 to the second end plate 106 are formed. It is composed. In the following description, a hole formed in each layer of the fuel cell stack 100 to constitute the through hole 108 may also be referred to as a through hole 108. As will be described later, it can be said that these through holes 108 correspond to the through holes constituting the gas flow path in the claims.

  Bolts 22 extending in the vertical direction are inserted into the through holes 108, and the fuel cell stack 100 is fastened by the bolts 22 and the first nuts 24 and the second nuts 25 fitted on both sides of the bolts 22. ing.

  The outer diameter of the shaft portion of each bolt 22 is smaller than the inner diameter of each through hole 108. Therefore, a space is secured between the outer peripheral surface of the shaft portion of each bolt 22 and the inner peripheral surface of each through hole 108. As shown in FIGS. 1 and 2, the fuel cell stack 100 is located near the midpoint of one side (the X-axis positive direction side of two sides parallel to the Y-axis) on the outer periphery around the Z-direction. The space formed by the bolt 22 (bolt 22A) and the through-hole 108 into which the bolt 22A is inserted is introduced with the oxidant gas OG from the outside of the fuel cell stack 100, and the oxidant gas OG is generated by each power generation. It functions as an oxidant gas introduction manifold 161 that is a gas flow path to be supplied to the unit 102, and is the midpoint of the side opposite to the side (X-axis negative direction side of two sides parallel to the Y-axis) The space formed by the bolts 22 (bolts 22B) located in the vicinity and the through holes 108 into which the bolts 22B are inserted has an oxidant off-gas OOG that is a gas discharged from the air chamber 166 of each power generation unit 102. Burning Functions as the oxidizing gas discharging manifold 162 for discharging to the outside of the cell stack 100. In the present embodiment, for example, air is used as the oxidant gas OG.

  Further, as shown in FIGS. 1 and 3, the vicinity of the midpoint of one side (the side on the Y axis positive direction side of two sides parallel to the X axis) on the outer periphery of the fuel cell stack 100 around the Z direction The space formed by the bolt 22 (bolt 22D) located at the position and the through hole 108 into which the bolt 22D is inserted is introduced with the fuel gas FG from the outside of the fuel cell stack 100, and the fuel gas FG is generated by each power generation. Bolt 22 that functions as a fuel gas introduction manifold 171 to be supplied to the unit 102 and is located in the vicinity of the midpoint of the opposite side (the side on the Y axis negative direction side of the two sides parallel to the X axis). The space formed by the (bolt 22E) and the through hole 108 into which the bolt 22E is inserted is a fuel cell stack 1 that converts the fuel off-gas FOG, which is a gas discharged from the fuel chamber 176 of each power generation unit 102, into the fuel cell stack 1. Functions as a fuel gas exhaust manifold 172 for discharging to the outside of the 0. In the present embodiment, as the fuel gas FG, for example, hydrogen-rich gas obtained by reforming city gas is used.

  The fuel cell stack 100 is provided with four gas passage members 27. Each gas passage member 27 is made of metal, and has a hollow cylindrical main body portion 28 and a hollow cylindrical branch portion 29 branched from a side surface of the main body portion 28. 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. Further, as shown in FIG. 2, the hole of the main body portion 28 of the gas passage member 27 disposed at the position of the bolt 22 </ b> A forming the oxidant gas introduction manifold 161 communicates with the oxidant gas introduction manifold 161. The hole of the main body portion 28 of the gas passage member 27 disposed at the position of the bolt 22 </ b> B that forms the oxidant gas discharge manifold 162 communicates with the oxidant gas discharge manifold 162. Further, as shown in FIG. 3, the hole of the main body portion 28 of the gas passage member 27 arranged at the position of the bolt 22D forming the fuel gas introduction manifold 171 communicates with the fuel gas introduction manifold 171 and the fuel gas The hole of the main body portion 28 of the gas passage member 27 disposed at the position of the bolt 22 </ b> E forming the discharge manifold 172 communicates with the fuel gas discharge manifold 172.

  As shown in FIGS. 2 and 3, between the first nut 24 fitted on one side (upper side) of the bolt 22 and the upper surface of the first end plate 104 constituting the upper end of the fuel cell stack 100. A first insulating sheet 52 is interposed between the first insulating sheet 52 and the first insulating sheet 52. Further, a gas passage member is provided between the second nut 25 fitted on the other side (lower side) of the bolt 22 and the lower surface of the second end plate 106 constituting the lower end of the fuel cell stack 100. 27 and a second insulating sheet 54 disposed above and below the gas passage member 27 are interposed. Each of the insulating sheets 52 and 54 has a flat plate shape, such as a mica sheet, a ceramic fiber sheet, a ceramic powder sheet, a glass sheet, a glass ceramic composite agent, and the like. A hole communicating with the hole of the main body portion 28 is formed. The two insulating members (for example, the first nut 24 and the first end plate 104) that are adjacent to each other in the arrangement direction across the insulating sheets 52 and 54 are electrically insulated by the insulating sheets 52 and 54. And the gas-seal property between two electroconductive members is ensured. The first nut 24 corresponds to the second conductive member in the claims. The first insulating sheet 52 corresponds to the insulating member in the claims, and the surface 52A on the side (upper side) of the first insulating sheet 52 facing the first nut 24 is the second in the claims. Is equivalent to

(Configuration of end plates 104 and 106)
The first and second end plates 104 and 106 are made of, for example, stainless steel. The first end plate 104 corresponds to the first conductive member in the claims, and the surface 13A on the side (upper side) facing the first insulating sheet 52 in the first end plate 104 is claimed. It corresponds to the first surface in the range. The second end plate 106 corresponds to the second conductive member in the claims. The second end plate 106 is a substantially rectangular flat plate-shaped conductive member. The first end plate 104 has a substantially rectangular first main body portion 13 that is substantially the same size as the second end plate 106 when viewed in the Z-axis direction, and one side of the first main body portion 13 (parallel to the Y axis). 1st protrusion part 14 which protrudes in the direction (for example, X-axis negative direction) substantially orthogonal to the arrangement direction from the X-axis negative direction side) of the two sides. The first protrusion 14 of the first end plate 104 functions as a positive output terminal of the fuel cell stack 100. That is, the first end plate 104 also functions as a terminal plate. In the present embodiment, through holes 108 are formed in the first and second end plates 104, 106, and these through holes 108 are through holes constituting a gas flow path in the claims. It corresponds to.

(Configuration of terminal plate 18)
The terminal plate 18 is a substantially rectangular flat plate-shaped conductive member, and is made of, for example, stainless steel. The terminal plate 18 corresponds to the first conductive member in the claims, and the surface 18A on the side (lower side) of the terminal plate 18 facing the third insulating sheet 56 is the first in the claims. It corresponds to the surface of The terminal plate 18 includes a second main body 15 having a substantially rectangular shape that is substantially the same size as the second end plate 106 when viewed in the Z-axis direction, and one side of the second main body 15 (two parallel to the Y axis). A second protrusion 16 that protrudes in a direction substantially orthogonal to the arrangement direction (for example, the X-axis positive direction) from the X-axis positive direction side) is provided. The second protrusion 16 of the terminal plate 18 functions as a negative output terminal of the fuel cell stack 100.

  A flat plate-like third insulating sheet 56 is interposed between the terminal plate 18 and the second end plate 106. The third insulating sheet 56 is an insulating material made of mica or the like. A hole is formed in the third insulating sheet 56 at a position corresponding to each of the through holes 108, and a glass seal material 57 is disposed inside the hole. The glass sealing material 57 is formed with holes communicating with the above-described through holes 108. The terminal plate 18 and the second end plate 106, which are two conductive members adjacent to each other in the arrangement direction, with the third insulating sheet 56 and the glass sealing material 57 sandwiched between the third insulating sheet 56 and the glass sealing material 57. Are electrically insulated from each other, and a gas sealing property between the terminal plate 18 and the second end plate 106 is ensured. The third insulating sheet 56 corresponds to the insulating member in the claims, and the surface 58A on the side (lower side) of the third insulating sheet 56 facing the second end plate 106 is in the claims. This corresponds to the second surface.

(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. It is explanatory drawing which shows the YZ cross-section structure of the two electric power generation units.

  As shown in FIGS. 4 and 5, the power generation unit 102 that is the minimum unit of power generation includes a single cell 110, a separator 120, an air electrode side frame 130, an air electrode side current collector 134, and a fuel electrode side frame. 140, a fuel electrode side current collector 144, and a pair of interconnectors 150 constituting the uppermost layer and the lowermost layer of the power generation unit 102. The separator 120, the air electrode side frame 130, the fuel electrode side frame 140, and the interconnector 150 are formed with holes corresponding to the above-described through holes 108 into which the bolts 22 are inserted. In the present embodiment, the through hole 108 formed in the separator 120 or the interconnector 150 corresponds to a gas flow path in the claims.

  The interconnector 150 is a substantially rectangular flat plate-shaped conductive member, 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 the present 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 upper interconnector 150 in a power generation unit 102 is the same member as the lower interconnector 150 in another power generation unit 102 adjacent to the upper side of the power generation unit 102. Therefore, a certain interconnector 150 faces an air chamber 166 facing an air electrode 114 (described later) in a power generation unit 102, and a fuel electrode 116 (described later) in another power generation unit 102 adjacent to the upper side of the power generation unit 102. Facing the fuel chamber 176 facing the front. Further, since the fuel cell stack 100 includes the first end plate 104 and the terminal plate 18, the power generation unit 102 located at the uppermost position in the fuel cell stack 100 does not include the upper interconnector 150, and the lowest The power generation unit 102 located at is not provided with 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-shaped member. For example, YSZ (yttria stabilized zirconia), ScSZ (scandia stabilized zirconia), SDC (samarium doped ceria), GDC (gadolinium doped ceria), perovskite oxide It is formed with solid oxides such as. The air electrode 114 is a substantially rectangular flat plate-shaped member, and is formed of, for example, a perovskite oxide (for example, LSCF (lanthanum strontium cobalt iron oxide), LSM (lanthanum strontium manganese oxide), LNF (lanthanum nickel iron)). Has been. The fuel electrode 116 is a rectangular flat plate-like member, and is formed of, for example, Ni (nickel), cermet made of Ni and ceramic particles, Ni-based alloy, or the like. 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, for example, metal. 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. The single cell 110 to which the separator 120 is bonded is also referred to as a single cell with a separator.

 The air electrode side frame 130 is a frame-like member in which a substantially rectangular hole 131 penetrating in the vertical direction is formed near the center, and is formed of an insulator such as mica, for example. The hole 131 of the air electrode side frame 130 forms an air chamber 166 that faces the air electrode 114. The air electrode side frame 130 is in contact with the peripheral edge portion of the surface of the separator 120 opposite to the side facing the electrolyte layer 112 and the peripheral edge portion of the surface of the interconnector 150 facing the air electrode 114. . That is, the air electrode side frame 130 is sandwiched between the separator 120 and the interconnector 150. Therefore, the air electrode side frame 130 realizes a seal (compression seal) for the air chamber 166. The pair of interconnectors 150 included in the power generation unit 102 is electrically insulated by the air electrode side frame 130. The air electrode side frame 130 has an oxidant gas supply communication hole 132 communicating the oxidant gas introduction manifold 161 and the air chamber 166, and an oxidant gas communicating the air chamber 166 and the oxidant gas discharge manifold 162. A discharge communication hole 133 is formed.

  The fuel electrode side frame 140 is a frame-like member in which a substantially rectangular hole 141 penetrating in the vertical direction is formed near the center, and is made of, for example, metal. The hole 141 of the fuel electrode side frame 140 forms a fuel chamber 176 that faces the fuel electrode 116. The fuel electrode side frame 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. Further, the fuel electrode side frame 140 has a fuel gas supply communication hole 142 that connects the fuel gas introduction manifold 171 and the fuel chamber 176, and a fuel gas discharge communication hole 143 that connects the fuel chamber 176 and the fuel gas discharge manifold 172. And are formed.

  The fuel electrode side current collector 144 is disposed in the fuel chamber 176. The fuel electrode side current collector 144 includes an interconnector facing portion 146, an electrode facing portion 145, and a connecting portion 147 that connects the electrode facing portion 145 and the interconnector facing portion 146. For example, nickel or a nickel alloy It is made of stainless steel or the like. The electrode facing portion 145 is in contact with the surface of the fuel electrode 116 on the side opposite to the side facing the electrolyte layer 112, and the interconnector facing portion 146 is on the surface of the interconnector 150 on the side facing the fuel electrode 116. In contact. 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 interconnector facing portion 146 in the power generation unit 102 has a surface of the terminal plate 18. Touching. Since the fuel electrode side current collector 144 has such a configuration, the fuel electrode 116 and the interconnector 150 (or the terminal plate 18) are electrically connected. Note that a spacer 149 made of, for example, mica is disposed between the electrode facing portion 145 and the interconnector facing portion 146. Therefore, the fuel electrode side current collector 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 150 (or the terminal plate 18) via the fuel electrode side current collector 144. The electrical connection with is maintained well.

  The air electrode side current collector 134 is disposed in the air chamber 166. The air electrode side current collector 134 is composed of a plurality of current collector elements 135 having a substantially quadrangular prism shape, and is formed of, for example, ferritic stainless steel. The air electrode side current collector 134 is in contact with the surface of the air electrode 114 opposite to the side facing the electrolyte layer 112 and the surface of the interconnector 150 facing the air electrode 114. However, as described above, since the power generation unit 102 located at the top in the fuel cell stack 100 does not include the upper interconnector 150, the air electrode side current collector 134 in the power generation unit 102 has the first end. It is in contact with the surface of the plate 104. Since the air electrode side current collector 134 has such a configuration, the air electrode 114 and the interconnector 150 (or the first end plate 104) are electrically connected. The air electrode side current collector 134 and the interconnector 150 may be formed as an integral member.

A-2. Operation of the fuel cell stack 100:
As shown in FIGS. 2 and 4, the oxidant gas OG is supplied 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. Then, the oxidant gas OG is supplied to the oxidant gas introduction manifold 161 through the branch portion 29 of the gas passage member 27 and the hole of the main body portion 28, and the oxidant gas introduction manifold 161 oxidizes each power generation unit 102. It is supplied to the air chamber 166 through the agent gas supply communication hole 132. Further, as shown in FIGS. 3 and 5, the fuel gas FG is supplied 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. Then, the fuel gas FG is supplied to the fuel gas introduction manifold 171 through the branch portion 29 of the gas passage member 27 and the hole of the main body portion 28, and the fuel gas supply communication of each power generation unit 102 from the fuel gas introduction manifold 171. The fuel chamber 176 is supplied through the hole 142.

  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, power is generated by an electrochemical reaction between the oxidant gas OG and the fuel gas FG in the single cell 110. Is called. This power generation reaction is an exothermic reaction. 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 collector 134, and the fuel electrode 116 is connected via the fuel electrode side current collector 144. The other interconnector 150 is electrically connected. The plurality of power generation units 102 included in the fuel cell stack 100 are electrically connected in series. Therefore, the electric energy generated in each power generation unit 102 from the first projecting portion 14 of the first end plate 104 and the second projecting portion 16 of the terminal plate 18 functioning as the output terminal of the fuel cell stack 100. It is taken out. 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 hole 133 as shown in FIGS. The fuel cell stack 100 is connected to the branch portion 29 via a gas pipe (not shown) through the holes of the main body portion 28 and the branch portion 29 of the gas passage member 27 provided at the position of the agent gas discharge manifold 162. Is discharged outside. Further, as shown in FIGS. 3 and 5, 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 hole 143, and further to the fuel gas. The gas passage member 27 provided at the position of the discharge manifold 172 passes through the body portion 28 and the branch portion 29 and passes through a gas pipe (not shown) connected to the branch portion 29 to the outside of the fuel cell stack 100. Discharged.

A-3. Detailed configuration of the first nut 24:
The outlines in all cross sections parallel to the Z direction of the first nut 24 are a first opposite line 24A, a first opposing line 24B, a first outer peripheral line 24C, and a first chamfer line 24D. including. 2 and 3 exemplify outlines of the first nut 24 in the XZ section and the YZ section. The first opposite line 24 </ b> A is a straight line that forms the surface of the first nut 24 opposite to the side facing the first insulating sheet 52 (upper side), and is substantially parallel to the first insulating sheet 52. It is a straight line. The upper surface of the first nut 24 corresponds to the fourth surface in the claims. The first opposing line 24B is a straight line that constitutes the surface of the first nut 24 that faces the first insulating sheet 52 (lower side), is substantially parallel to the first insulating sheet 52, and Both ends are straight lines located on the center side of the first nut 24 from both ends of the first opposite line 24A. The lower surface of the first nut 24 corresponds to the third surface in the claims.

  The first outer peripheral line 24C is a straight line constituting the outer peripheral surface around the Z direction of the first nut 24, extends in a direction (vertical direction) substantially orthogonal to the first insulating sheet 52, and The end (lower end) on the insulating sheet 52 side is a straight line separated from the first insulating sheet 52. The first outer peripheral line 24C corresponds to a parallel line in the claims. The first chamfer line 24D is a straight line connecting the end of the first opposing line 24B and the lower end of the first outer peripheral line 24C. The first chamfer line 24D corresponds to a connecting line in the claims. That is, the corner portion between the lower surface of the first nut 24 and the outer peripheral surface around the Z direction is a chamfered portion by chamfering the entire periphery. Thereby, a space is formed over the entire circumference between the lower peripheral portion of the first nut 24 and the first insulating sheet 52. Note that the distance ΔD1 (see FIG. 2) between the lower end of the first outer peripheral line 24C in the Z direction and the first insulating sheet 52, and the lower end of the first outer peripheral line 24C in the XY plane direction The distance ΔD2 (see FIG. 2) with the lower surface of the first nut 24 is preferably 1 mm or more (C1 or more). Furthermore, as viewed in the Z-axis direction, the third outer peripheral line 52B constituting the outer peripheral surface of the first insulating sheet 52 protrudes outward from the first outer peripheral line 24C of the first nut 24 over the entire periphery. .

A-4. Detailed configuration of the second end plate 106:
The outlines in all cross sections parallel to the Z direction of the second end plate 106 are the second opposite line 106A, the second opposing line 106B, the second outer peripheral line 106C, and the second chamfer line 106D. Including. 2 and 3 exemplify outlines of the second end plate 106 in the XZ section and the YZ section. The second opposite line 106 </ b> A is a straight line that constitutes a surface on the opposite side (lower side) of the second end plate 106 opposite to the side facing the third insulating sheet 56. Parallel straight lines. The lower surface of the second end plate 106 corresponds to the fourth surface in the claims. The second opposing line 106B is a straight line that forms the surface (upper side) of the second end plate 106 that faces the third insulating sheet 56, is substantially parallel to the third insulating sheet 56, and Both ends are straight lines located closer to the center of the second end plate 106 than both ends of the second opposite line 106A. The upper surface of the second end plate 106 corresponds to the third surface in the claims.

  The second outer peripheral line 106C is a straight line that constitutes the outer peripheral surface around the Z direction of the second end plate 106, extends in a direction (vertical direction) substantially perpendicular to the third insulating sheet 56, and third The end (upper end) on the insulating sheet 56 side is a straight line separated from the third insulating sheet 56. The second outer peripheral line 106C corresponds to a parallel line in the claims. The second chamfer line 106D is a straight line connecting the end of the second opposing line 106B and the upper end of the second outer peripheral line 106C. The second chamfer line 106D corresponds to a connecting line in the claims. That is, the corner between the upper surface of the second end plate 106 and the outer circumferential surface around the Z direction is a chamfered portion by chamfering the entire circumference. Thus, a space is formed over the entire circumference between the upper peripheral edge of the second end plate 106 and the third insulating sheet 56. The distance ΔD3 (see FIG. 2) between the upper end of the second outer peripheral line 106C in the Z direction and the third insulating sheet 56, the upper end of the second outer peripheral line 106C in the XY plane direction, and the second The distance ΔD4 (see FIG. 2) from the upper surface of the end plate 106 is preferably 1 mm or more (C1 or more). Further, as viewed in the Z-axis direction, the fourth outer peripheral line 15B constituting the outer peripheral surface of the second main body 15 of the terminal plate 18 and the fifth outer peripheral line 56B constituting the outer peripheral surface of the third insulating sheet 56 are displayed. The second outer peripheral line 106C of the second end plate 106 overlaps the entire circumference.

A-5. Insulation test:
FIG. 6 is a schematic diagram of a sample 200 used in the insulation test. The sample 200 includes a nut 210, a plate material 220, and a mica 230 disposed between the nut 210 and the plate material 220. The nut 210 is made of stainless steel and has a diameter of approximately 16 mm. Since the outer shape of the nut 210 is the same as that of the first nut 24, the same reference numerals as those of the first nut 24 are given in FIG. 6. In the insulation test, four nuts 210 having different distances ΔD1 and ΔD2 (see FIG. 2) (ΔD1, ΔD2 = 0.3 mm (C0.3), 1 mm (C1), 2 mm (C2), 3 mm (C3)) Prepare. The plate member 220 is made of stainless steel and has a diameter of approximately 25 mm. Similar to the nut 210, the mica 230 has a diameter of about 16 mm and a thickness of 0.4 mm. Then, an insulation test was performed on four samples 200 including each of the four nuts 210. Specifically, each sample 200 is placed in a temperature environment of 700 ° C., a DC voltage is applied between the nut 210 and the plate member 220, and the voltage value is increased at a voltage increase rate of 6 V per second. A change in discharge voltage between the plate member 220 was confirmed.

  FIG. 7 is a graph showing the results of an insulation test performed using the sample 200, where the vertical axis represents the withstand voltage (V), and the horizontal axis represents the chamfer line 24D and the upper end of the outer peripheral surface of the mica 230. The shortest distance L1 is shown. The shortest distance L1 can be calculated from the distances ΔD1, ΔD2, for example. Here, the spatial distance is the shortest distance in the space between the nut 210 and the plate member 220, and specifically, is the total distance of the shortest distance L1 and the thickness L2 of the mica 230. C0.3, C1, C2, and C3 attached to each plot in the graph of FIG. 7 mean the four samples 200 described above. As can be seen from the graph, even when the thickness L2 of the mica 230 is the same, the longer the distance ΔD1 and the distance ΔD2 (second chamfer line 106D), the longer the spatial distance becomes, and the distance between the nut 210 and the plate member 220 increases. The withstand voltage (insulation) is high. In particular, when the distances ΔD1 and ΔD2 are 1 mm or more (C1 or more), the withstand voltage is remarkably high.

  Note that the outer diameter of the mica 230 may be larger than the outer diameter of the nut 210, similarly to the first nut 24 and the first insulating sheet 52 shown in FIGS. 2 and 3. In this case, the spatial distance is the total distance of the shortest distance L1, the thickness L2 of the mica 230, and the outer diameter difference between the mica 230 and the nut 210, and the spatial distance is further longer than the configuration shown in FIG. That is, the withstand voltage (insulation) between the nut 210 and the plate member 220 increases as the outer diameter of the mica 230 is larger than the outer diameter of the nut 210, in other words, as the protruding length of the mica 230 with respect to the nut 210 increases. Get higher.

A-6. Effects of this embodiment:
As described above, the corner between the lower surface of the first nut 24 and the outer circumferential surface around the Z direction is a chamfered portion by chamfering the entire circumference. Moreover, as viewed in the Z-axis direction, the third outer peripheral line 52B constituting the outer peripheral surface of the first insulating sheet 52 protrudes outward from the first outer peripheral line 24C of the first nut 24 over the entire periphery. . For this reason, the spatial distance between the first nut 24 and the first end plate 104 is longer than the configuration in which the first nut 24 and the first insulating sheet 52 have the same size without the cutout portion. Therefore, current leakage between the first nut 24 and the first end plate 104 can be suppressed.

  Further, a corner portion between the upper surface of the second end plate 106 and the outer peripheral surface around the Z direction is a chamfered portion by chamfering the entire periphery. For this reason, since the spatial distance between the terminal plate 18 and the second end plate 106 is longer than that in the configuration without the notch, the third insulating sheet 56 is provided with the second main body 15 and the second end plate 18 of the terminal plate 18. Even if it is the same size as the second end plate 106, it is possible to suppress the leakage of current between the terminal plate 18 and the second end plate 106. Although the output terminal of the terminal plate 18 has a particularly high potential, current leakage can be suppressed by applying the present invention.

  Here, a method of increasing the spatial distance between the first conductive member (first end plate 104, terminal plate 18) and the second conductive member (first nut 24, second end plate 106). As a method, a method of forming a notch in the first conductive member can be considered. However, if a notch is formed in the first conductive member that is electrically connected to the unit cell 110 and forms a current path, the electrical resistance of the first conductive member increases, and the output of the fuel cell stack 100 is increased. May decrease. In particular, if a notch is formed in the second protrusion 16 of the terminal plate 18, the electrical resistance of the output terminal increases, so that the rated output cannot be taken out from the output terminal, and the high output of the fuel cell stack 100 is high. There is a risk that it will not be possible to respond to the request. As another method, the insulating member (the first insulating sheet 52 and the third insulating sheet 56) disposed between the first conductive member and the second conductive member is deformed by bending or the like. The method of adding can be considered. However, the material of the insulating sheet is limited to a material that can be bent, and there is a possibility that the strength and insulation of the processed portion cannot be secured. On the other hand, in this embodiment, as described above, the first conductive member and the first conductive member are formed without forming a notch and using a flat insulating member. It can suppress that an electric current leaks between 2nd electroconductive members.

  Further, the first chamfer line 24D is a straight line at a position on an imaginary straight line W1 connecting the end of the first opposing line 24B and the lower end of the first outer peripheral line 24C. For this reason, since the spatial distance between the 1st nut 24 and the 1st end plate 104 is long compared with the case where a part of 1st chamfering line 24D protrudes below the virtual straight line W1, the 1st It is possible to more effectively suppress current leakage between the first nut 24 and the first end plate 104. Further, the second chamfer line 106D is a straight line at a position on an imaginary straight line W2 connecting the end of the second opposing line 106B and the upper end of the second outer peripheral line 106C. For this reason, since the space distance between the terminal plate 18 and the 2nd end plate 106 is long compared with the case where a part of 2nd chamfering line 106D protrudes above the virtual straight line W2, the terminal plate 18 and Leakage of current between the second end plate 106 and the second end plate 106 can be more effectively suppressed.

  In addition, the fourth outer peripheral line 15B of the terminal plate 18, the fifth outer peripheral line 56B of the third insulating sheet 56, and the second outer peripheral line 106C of the second end plate 106 are viewed in the Z-axis direction. Since they are in the same position, it is possible to suppress the positional relationship between the terminal plate 18, the third insulating sheet 56, and the second end plate 106 and the positional relationship between the through holes 108 formed in these members from being shifted. Can do.

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.

  In the above embodiment, the first end plate 104 may be changed to an end plate that does not have an output terminal, like the second end plate 106. The end plate not having the output terminal also corresponds to the first conductive member in the claims. Further, the first end plate 104 has the same configuration as the second end plate 106, and the same insulating sheet as the third insulating sheet 56 and the same terminal plate as the terminal plate 18 are used as the first end plate. You may arrange | position in this order from the 104 side. In this case, the first end plate 104 and the insulating sheet correspond to the first conductive member and the insulating member in the claims. In addition, the 2nd protrusion part 16 grade | etc., Of the terminal plate 18 is not limited to what protrudes in the direction orthogonal to the said array direction, What is necessary is just to protrude in the direction which cross | intersects an array direction.

  Moreover, in the said embodiment, you may exclude the 3rd insulating sheet 56 and the 2nd end plate 106, and may make the terminal plate 18 and the 2nd insulating sheet 54 contact. In this case, the gas passage member 27 corresponds to the second conductive member in the claims, and the second insulating sheet 54 disposed between the terminal plate 18 and the gas passage member 27 is It corresponds to the insulating member in the range. Further, the power generation unit 102 and the second end plate 106 may be brought into contact with each other by removing the terminal plate 18 and the insulating material 58. In this case, the second end plate 106 corresponds to the first conductive member in the claims, and the gas passage member 27 corresponds to the second conductive member in the claims. The second insulating sheet 54 disposed between the end plate 106 and the gas passage member 27 corresponds to the insulating member in the claims.

  In the said embodiment, although the combination of a glass sealing material, a mica sheet, a glass sealing material, and a mica sheet was illustrated as an insulating member, it is not limited to this, For example, a ceramic fiber sheet, a ceramic compaction sheet, a glass ceramic composite agent etc. It may be constituted by.

  In the above embodiment, the first nut 24 may be a nut in which a notch is not formed. Even in such a configuration, if the first insulating sheet 52 protrudes from the nut over the entire circumference, leakage of current between the nut and the first end plate 104 can be suppressed. .

  In the said embodiment, the periphery of the lower surface of the 1st nut 24 is located inside the periphery of the upper surface 52A of the 1st insulating sheet 52 over the perimeter in Z-axis direction view. Is satisfied, the outlines in at least one cross section parallel to the Z direction of the first nut 24 are the first opposite line 24A, the first opposing line 24B, the first outer peripheral line 24C, and the first The chamfer line 24D may be included. For example, a notch is formed in a part of the corner between the lower surface of the first nut 24 and the outer peripheral surface around the Z direction, and the first insulating sheet 52 is formed at the position corresponding to the part. The structure which protrudes from the nut 24 of 1 may be sufficient. Further, the condition that the peripheral edge of the upper surface of the second end plate 106 is located inside the peripheral edge of the lower surface 58A of the third insulating sheet 56 over the entire periphery in the Z-axis direction view. For example, the outline in at least one cross section parallel to the Z direction of the second end plate 106 includes a second opposite line 106A, a second opposing line 106B, a second outer peripheral line 106C, and a second outer line 106C. The structure including chamfering line 106D may be sufficient.

  Further, as shown in FIG. 8, the second chamfer line 106D may be an arc line 106E at a position below the virtual straight line W2. With this configuration, current leakage between the terminal plate 18 and the second end plate 106 can be more effectively suppressed with a relatively simple shape.

  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, the nuts 24 and 25 are fitted on both sides of the bolt 22. However, the bolt 22 has a head, and the nuts 24 and 25 are fitted only on the opposite side of the head of the bolt 22. It may be.

  Moreover, in the said embodiment, although the space between the outer peripheral surface of the axial part of each bolt 22 and the inner peripheral surface of each through-hole 108 is utilized as each manifold, it replaces with this and the axis | shaft of each bolt 22 is used. An axial hole may be formed in the part, and the hole may be used as each manifold. Further, each manifold may be provided separately from each through hole 108 into which each bolt 22 is inserted.

  In the above 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. Two power generation units 102 may be provided with respective interconnectors 150. In the above embodiment, the upper interconnector 150 of the uppermost power generation unit 102 in the fuel cell stack 100 and the lower interconnector 150 of the lowermost power generation unit 102 are omitted. These interconnectors 150 may be provided without being omitted.

  Further, in the above embodiment, the fuel electrode side current collector 144 may have the same configuration as the air electrode side current collector 134, and the fuel electrode side current collector 144 and the adjacent interconnector 150 are an integral member. It may be. Further, the fuel electrode side frame 140 instead of the air electrode side frame 130 may be an insulator. The air electrode side frame 130 and the fuel electrode side frame 140 may have a multilayer structure.

  Moreover, the material which forms each member in the said embodiment is an illustration to the last, and each member may be formed with another material.

  In the above embodiment, the city gas is reformed to obtain the hydrogen-rich fuel gas FG, but the fuel gas FG may be obtained from other raw materials such as LP gas, kerosene, methanol, gasoline, Pure hydrogen may be used as the fuel gas FG.

  In the present specification, the fact that the member B and the member C are opposed to each other across the member (or a part having the member, the same applies hereinafter) A is not limited to the form in which the member A and the member B or the member C are adjacent to each other. It includes a form in which another component is interposed between member A and member B or member C. For example, even in a configuration in which another layer is provided between the electrolyte layer 112 and the air electrode 114, it can be said that the air electrode 114 and the fuel electrode 116 face each other with the electrolyte layer 112 interposed therebetween.

  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 minimum 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. 2014-207120, and thus will not be described in detail here. It is a configuration. That is, the fuel cell stack 100 in the above-described embodiment may be read as an electrolytic cell stack, and the power generation unit 102 may be read as an electrolytic cell unit. 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), and through the through hole 108. 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 through hole 108. In the electrolytic cell unit and the electrolytic cell stack having such a configuration, similarly to the above-described embodiment, a notch is formed in the second conductive member, or the insulating member is protruded from the second conductive member. If the structure to employ | adopt is employ | adopted, there exists an effect that it can suppress that an electric current leaks between a 1st electroconductive member and a 2nd electroconductive member.

  In the above embodiment, the solid oxide fuel cell (SOFC) has been described as an example. However, the present invention can be applied to a solid polymer fuel cell (PEFC), a phosphoric acid fuel cell (PAFC), a molten carbonate type. It can also be applied to other types of fuel cells (or electrolysis cells) such as fuel cells (MCFC).

  13: Body 13A: Surface 14: Projection 15: Body 15B: Peripheral line 16: Second projection 18: Terminal plate 18A: Surface 22: Bolt 24: First nut 24A: First opposite line 24B : First counter line 24C: first outer peripheral line 24D: first chamfer line 25: nut 27: gas passage member 28: main body part 29: branch part 52: first insulating sheet 52A: upper surface 52B: first 3 outer peripheral line 54: second insulating sheet 56: third insulating sheet 56B: fifth outer peripheral line 57: glass sealing material 58: insulating material 58A: lower surface 100: fuel cell stack 102: power generation unit 104: First end plate 106: Second end plate 106A: Second opposite line 106B: Second opposing line 106C: Second outer peripheral line 106 : Second chamfer line 106E: Arc line 108: Through 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 131: Hole 132 : Oxidant gas supply communication hole 133: Oxidant gas discharge communication hole 134: Air electrode side current collector 135: Current collector element 140: Fuel electrode side frame 141: Hole 142: Fuel gas supply communication hole 143: Fuel gas discharge Communication hole 144: Fuel electrode side current collector 145: Electrode facing portion 146: Interconnector facing portion 147: Connecting portion 149: Spacer 150: Interconnector 161: Oxidant gas introduction manifold 162: Oxidant gas discharge manifold 166: Air chamber 171: Fuel gas introduction manifold 172: Fuel gas discharge manifold Hold 176: Fuel chamber 200: Sample 210: Nut 220: Plate material 230: Mica FG: Fuel gas FOG: Fuel off gas L1: Shortest distance L2: Thickness OG: Oxidant gas OOG: Oxidant off gas W1, W2: Virtual straight line

Claims (9)

A plurality of unit cells arranged side by side in a first direction, each including an electrolyte layer and an air electrode and a fuel electrode facing each other in the first direction across the electrolyte layer;
A flat plate-like first conductive member disposed on one side of the plurality of single cells in the first direction, electrically connected to the air electrode or the fuel electrode, and having conductivity;
A flat insulating member adjacent to the first surface which is the one side surface of the first conductive member;
In an electrochemical reaction cell stack comprising: a second conductive member adjacent to a second surface which is the one side surface of the insulating member and having conductivity;
When viewed from the first direction, the periphery of the third surface, which is the surface on the other side in the first direction of the second conductive member, extends over the entire circumference of the second surface of the insulating member. An electrochemical reaction cell stack, wherein the electrochemical reaction cell stack is located on the inner side of the periphery of the surface. The electrochemical reaction cell stack according to claim 1,
The first conductive member includes a flat plate-like main body electrically connected to the air electrode or the fuel electrode, and a protrusion protruding from the main body in a direction intersecting the first direction. An electrochemical reaction cell stack comprising: The electrochemical reaction cell stack according to claim 1 or 2,
An outline in at least one cross section parallel to the first direction of the second conductive member is parallel to the parallel line parallel to the first direction with the end on the other side being separated from the insulating member, Including a connecting line connecting the end of the third surface located on the inner side of the parallel line and the other end of the parallel line in a first direction view. Electrochemical reaction cell stack. The electrochemical reaction cell stack according to claim 3,
The connecting line is located at a position on a virtual straight line connecting the end of the third surface and the end of the other side of the parallel line or a position on the one side of the virtual straight line over the entire length. Characteristic electrochemical reaction cell stack. An electrochemical reaction cell stack according to claim 4,
The electrochemical reaction cell stack, wherein the connecting line is a straight line or an arc line connecting the end of the third surface and the other end of the parallel line. An electrochemical reaction cell stack according to any one of claims 3 to 5, comprising:
The electrochemical reaction cell stack, wherein outlines of all cross sections of the second conductive member parallel to the first direction include the parallel lines and the connecting lines. An electrochemical reaction cell stack according to any one of claims 1 to 5,
The outline of at least one cross section parallel to the first direction of the second conductive member and the insulating member is the second conductive member from the end of the third surface of the second conductive member. A straight line extending in parallel with the first direction to the end of the fourth surface which is the one side surface of the insulating member, and in the first direction view, the second surface of the insulating member An end of the electrochemical reaction cell stack, wherein the end is at a position on the outer peripheral side of the electrochemical reaction cell stack with respect to the straight line. The electrochemical reaction cell stack according to any one of claims 1 to 7,
In the first conductive member, the insulating member, and the second conductive member, a through hole constituting a gas flow path is formed,
The electrochemical reaction cell stack, wherein in the first direction view, at least one side of each of the first conductive member, the insulating member, and the second conductive member is at the same position. In the electrochemical reaction cell stack according to any one of claims 1 to 8,
The electrochemical reaction cell stack is a fuel cell stack that generates electric power.

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