JP6667278B2 - Electrochemical reaction cell stack - Google Patents

Description

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

  As one type of fuel cell that generates power using an electrochemical reaction between hydrogen and oxygen, a solid oxide fuel cell (hereinafter, referred to as “SOFC”) having an electrolyte layer containing a solid oxide is known. Have 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 an “arrangement direction”). The single cell includes an electrolyte layer, and an air electrode and a fuel electrode that face each other in the arrangement direction with the electrolyte layer interposed therebetween.

  The fuel cell stack further includes a flat first conductive member that is disposed on one side in the arrangement direction of the plurality of single cells and is electrically connected to the air electrode or the fuel electrode; It has 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, as a first conductive member, a terminal plate having a projection connected to an external terminal, and as a second conductive member, an insulating member is provided on one surface of the terminal plate. And an end plate that is disposed in a vertical direction.

JP 2003-346869 A

  Since the first conductive member is electrically connected to the air electrode or the fuel electrode, the first conductive member has a higher fuel density than the second conductive member disposed on the first conductive member via the insulating member. The potential becomes high during the power generation operation of the battery stack. In particular, in order to respond to a demand for higher output, in a fuel cell stack in which a large number of single cells are arranged, the first conductive member has a particularly high potential. As described above, when the first conductive member has a high potential, the first conductive member may be disposed even though the insulating member is disposed between the first conductive member and the second conductive member. From the first conductive member to the second conductive member, and the current may leak.

  Such a problem is also common to an electrolytic cell stack which is one form of a solid oxide type electrolytic cell (hereinafter, referred to as “SOEC”) that generates hydrogen using 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. In addition, such a problem is not limited to SOFC and SOEC, but is also a problem common to other types of electrochemical reaction cell stacks.

  This specification discloses a technique capable of solving at least a part of the above-described problem.

  The technology disclosed in this specification can be realized as the following modes.

(1) The electrochemical reaction cell stack disclosed in this specification is arranged side by side in a first direction, and has an electrolyte layer and an air electrode and a fuel electrode that face each other in the first direction with the electrolyte layer interposed therebetween. A plurality of single cells, each of which includes: a plurality of single cells, which are arranged on one side of the plurality of single cells in the first direction, are electrically connected to the air electrode or the fuel electrode, and have a conductive flat plate shape. A first conductive member, a flat insulating member adjacent to the first surface that is the one surface of the first conductive member, and a second insulating member that is the one surface of the insulating member. A second conductive member having conductivity and being adjacent to a surface of the second conductive member, wherein the first direction of the second conductive member is viewed in the first direction. The periphery of the third surface, which is the other surface of 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 located at the same position as or outside the periphery of the second surface of the insulating member. Therefore, since the space distance between the first conductive member and the second conductive member is long, it is possible to suppress a current from leaking between the first conductive member and the second conductive member. be able to.

(2) In the electrochemical reaction cell stack, the first conductive member may be a flat main body electrically connected to the air electrode or the fuel electrode, and the first conductive member may be a first main body from the main body. And a projecting portion projecting in a direction intersecting the direction. The first conductive member is a member provided with a protruding portion for outputting a current to the outside, and thus is particularly likely to have a high potential. However, according to the present electrochemical reaction cell stack, the spatial distance between the first conductive member and the second conductive member is long, so that the first conductive member and the second conductive member Current can be suppressed from leaking between the two.

(3) In the electrochemical reaction cell stack, the outline of at least one cross section of the second conductive member parallel to the first direction is formed by separating the other end of the second conductive member from the insulating member. A connecting line connecting a parallel line parallel to the first direction, an end of the third surface located inside the parallel line as viewed in the first direction, and the other end of the parallel line; And a line. According to the present electrochemical reaction cell stack, in the first direction, the periphery of the third surface of the second conductive member is separated from the insulating member of the second conductive member over the entire circumference. As compared with the case where the insulating member is located at the same position as the periphery of the portion, it is possible to suppress the current from leaking 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 may be a position on a virtual straight line or the virtual straight line connecting an end of the third surface and the other end of the parallel line over the entire length. It may be configured to be located at the one side position. According to the present electrochemical reaction cell stack, the distance between the first conductive member and the second conductive member is smaller than when the part of the connecting line is located on the other side in the first direction from the virtual straight line. Since the space distance is long, it is possible to more effectively suppress the current from leaking 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 an end of the third surface and the other end of the parallel line. According to the present electrochemical reaction cell stack, current leakage between the first conductive member and the second conductive member can be more effectively suppressed by a relatively simple shape. it can.

(6) In the electrochemical reaction cell stack, the outline of all cross sections of the second conductive member parallel to the first direction may include the parallel line and the connecting line. According to the present electrochemical reaction cell stack, current is suppressed from leaking between the first conductive member and the second conductive member 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 of the second conductive member and the insulating member, which is parallel to the first direction, is formed by the second conductive member and the insulating member. 3 includes a straight line extending in parallel with the first direction from an end of the third surface to an end of a fourth surface that is the one surface of the second conductive member, and in the first direction. The end of the second surface of the insulating member may be located at a position on the outer peripheral side of the electrochemical reaction cell stack with respect to the straight line. According to the present electrochemical reaction cell stack, current is prevented from leaking between the first conductive member and the second conductive member 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 forming a gas flow path, and In the direction viewed from above, at least one side of each of the first conductive member, the insulating member, and the second conductive member may be at the same position. According to the present 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, It is possible to prevent the positional relationship between the through holes of the first conductive member, the insulating member, and the second conductive member from being shifted from each other and the positional relationship between the through holes of the first conductive member, the insulating member, and the second conductive member.

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

FIG. 1 is a perspective view illustrating an external configuration of a fuel cell stack 100 according to the embodiment. 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. 1. FIG. 3 is an explanatory diagram showing a YZ cross-sectional configuration of the fuel cell stack 100 at a position of III-III in FIG. 1. FIG. 3 is an explanatory diagram illustrating an XZ cross-sectional configuration of two power generation units adjacent to each other at the same position as the cross-section illustrated in FIG. 2. FIG. 4 is an explanatory diagram illustrating a YZ cross-sectional configuration of two power generation units 102 adjacent to each other at the same position as the cross-section illustrated in FIG. 3. FIG. 4 is a schematic diagram of a sample 200 used in an insulation test. 9 is a graph showing the results of an insulation test performed using sample 200. It is a partial enlarged view 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 illustrating an external configuration of the fuel cell stack 100 according to the present embodiment. FIG. 2 is an explanatory diagram illustrating 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 the YZ cross-sectional configuration of the fuel cell stack 100 at the position of III-III in FIG. Each drawing shows XYZ axes orthogonal to each other for specifying the direction. In the present specification, for the sake of convenience, the positive direction of the Z axis is referred to as an upward direction, and the negative direction of the Z axis is referred to as a downward direction. However, the fuel cell stack 100 is actually oriented in a direction different from such a direction. It may be installed. The same applies to FIG. 4 and subsequent figures.

  The fuel cell stack 100 includes a plurality of (seven in this embodiment) 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 the present embodiment, the vertical direction (Z-axis direction)). The terminal plate 18 is disposed below the lowermost power generation unit 102. The first end plate 104 is disposed above the uppermost power generation unit 102, and the second end plate 106 is disposed below the terminal plate 18. Note that the arrangement direction (vertical direction) corresponds to the first direction in the claims.

  A plurality of layers (in the present embodiment) penetrating in the up-down direction are formed on the periphery of each layer (power generation unit 102, first and second end plates 104, 106, terminal plate 18) constituting the fuel cell stack 100 around the Z direction. Holes are formed in the respective layers, 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. Make up. In the following description, the holes formed in each layer of the fuel cell stack 100 to form the through holes 108 may also be referred to as the through holes 108. As will be described later, these through holes 108 can be said to correspond to the through holes constituting the gas flow channel in the claims.

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

  The outer diameter of the shaft 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 FIG. 1 and FIG. 2, the fuel cell stack 100 is located near the midpoint of one side (side of two sides parallel to the Y axis on the positive side of the X axis) on the outer periphery around the Z direction. Oxidizing gas OG is introduced from the outside of the fuel cell stack 100 into a space formed by the bolts 22 (bolts 22A) and the through holes 108 into which the bolts 22A are inserted. It functions as an oxidizing gas introduction manifold 161 which is a gas flow path to be supplied to the unit 102, and has a midpoint on a side opposite to the side (a side on the negative side in the X-axis direction 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 contains the oxidant off-gas OOG, which is the 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 this embodiment, for example, air is used as the oxidizing gas OG.

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

  The fuel cell stack 100 is provided with four gas passage members 27. Each gas passage member 27 is formed of metal and has a hollow cylindrical main body 28 and a hollow cylindrical branch 29 branched off from a side surface of the main body 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, a hole of the main body 28 of the gas passage member 27 disposed at the position of the bolt 22A forming the oxidizing gas introduction manifold 161 communicates with the oxidizing gas introduction manifold 161. The hole of the main body 28 of the gas passage member 27 arranged at the position of the bolt 22B forming the oxidizing gas discharge manifold 162 communicates with the oxidizing gas discharge manifold 162. As shown in FIG. 3, a hole in the main body 28 of the gas passage member 27 disposed at the position of the bolt 22D forming the fuel gas introduction manifold 171 communicates with the fuel gas introduction manifold 171. The hole of the main body 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. 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 forming the lower end of the fuel cell stack 100. 27 and second insulating sheets 54 disposed on the upper and lower sides of the gas passage member 27, respectively. Each of the insulating sheets 52 and 54 has a flat plate shape, and is, for example, a mica sheet, a ceramic fiber sheet, a ceramic powder sheet, a glass sheet, a glass ceramic composite, or the like. A hole communicating with the hole of the main body 28 is formed. The two conductive members (for example, the first nut 24 and the first end plate 104) that are adjacent to each other in the arrangement direction with the respective insulating sheets 52 and 54 interposed therebetween are electrically insulated by the respective insulating sheets 52 and 54. In addition, gas sealing between the two conductive members is ensured. The first nut 24 corresponds to a second conductive member in the claims. The first insulating sheet 52 corresponds to an insulating member in the claims, and a surface 52 </ b> A on the side (upper side) of the first insulating sheet 52 facing the first nut 24 is the second member in the claims. Surface.

(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 a first conductive member in the claims, and a surface 13 </ b> A on the side (upper side) of the first end plate 104 facing the first insulating sheet 52 is described in the claims. Corresponds to the first surface. The second end plate 106 corresponds to a second conductive member in the claims. The second end plate 106 is a substantially rectangular plate-shaped conductive member. The first end plate 104 has a substantially rectangular first main body 13 having substantially the same size as the second end plate 106 as viewed in the Z-axis direction, and one side of the first main body 13 (parallel to the Y axis). A first protruding portion 14 that protrudes from the two sides (the side on the negative side of the X axis) in a direction substantially orthogonal to the arrangement direction (for example, the negative direction of the X axis). 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, the first and second end plates 104 and 106 have through holes 108 formed therein, and these through holes 108 constitute the gas passages in the claims. Is equivalent to

(Configuration of terminal plate 18)
The terminal plate 18 is a substantially rectangular flat plate-shaped conductive member, and is formed of, for example, stainless steel. The terminal plate 18 corresponds to a first conductive member in the claims, and a surface 18A on the side (lower side) of the terminal plate 18 facing the third insulating sheet 56 is the first conductive member in the claims. Of the surface. The terminal plate 18 includes a substantially rectangular second main body 15 having 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 (the two parallel to the Y axis). A second protruding portion 16 that protrudes from a side (the side on the X-axis positive direction side) in a direction substantially orthogonal to the arrangement direction (for example, the X-axis positive direction) 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 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 sealing material 57 is disposed inside the hole. Holes communicating with the above-mentioned through holes 108 are formed in the glass sealing material 57. With the third insulating sheet 56 and the glass sealing material 57, 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 interposed therebetween. Are electrically insulated from each other, and the gas sealing property between the terminal plate 18 and the second end plate 106 is ensured. The third insulating sheet 56 corresponds to an insulating member in the claims, and a surface (lower side) 58A of the third insulating sheet 56 on the side (lower side) facing the second end plate 106 is in the claims. This corresponds to the second surface.

(Configuration of the power generation unit 102)
FIG. 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. 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-sectional structure of two electric power generation units.

  As shown in FIGS. 4 and 5, the power generation unit 102, which 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 forming the uppermost layer and the lowermost layer of the power generation unit 102. Holes corresponding to the through-holes 108 into which the above-described bolts 22 are inserted are formed in peripheral edges around the Z direction in the separator 120, the air electrode side frame 130, the fuel electrode side frame 140, and the interconnector 150. In the present embodiment, the through holes 108 formed in the separator 120 and the interconnector 150 correspond to a gas flow channel 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 secures electrical continuity between the power generation units 102 and prevents mixing of reaction gas 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 upper interconnector 150 in a certain 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 a later-described air electrode 114 in a certain power generation unit 102, and also has a later-described fuel electrode 116 in another power generation unit 102 adjacent above the power generation unit 102. Facing the fuel chamber 176 facing. 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 Are not provided with the lower interconnector 150 (see FIGS. 2 and 3).

  The single cell 110 includes an electrolyte layer 112, and an air electrode (cathode) 114 and a fuel electrode (anode) 116 that are opposed to each other in the vertical direction (the direction in which the power generation units 102 are arranged) across the electrolyte layer 112. The unit cell 110 of the present embodiment is a unit cell of an anode supporting type in which the anode 116 supports the electrolyte layer 112 and the cathode 114.

  The electrolyte layer 112 is a substantially rectangular plate-shaped member, for example, YSZ (yttria stabilized zirconia), ScSZ (scandia stabilized zirconia), SDC (samarium-doped ceria), GDC (gadolinium-doped ceria), perovskite oxide And the like. The air electrode 114 is a substantially rectangular 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)). Have been. The fuel electrode 116 is a rectangular plate-shaped member, and is formed of, for example, Ni (nickel), a cermet made of Ni and ceramic particles, a Ni-based alloy, or the like. As described above, the single cell 110 (power generation unit 102) of the present embodiment is a solid oxide fuel cell (SOFC) using a solid oxide as an electrolyte.

  The separator 120 is a frame-shaped member in which a substantially rectangular hole 121 penetrating in the vertical direction is formed near the center, and is formed of, for example, metal. The peripheral portion of the hole 121 in the separator 120 faces the peripheral portion of the surface of the electrolyte layer 112 on the air electrode 114 side. The separator 120 is joined to the electrolyte layer 112 (single cell 110) by a joining portion 124 formed of a brazing material (for example, Ag brazing) disposed at a portion facing the separator 120. The separator 120 divides the air chamber 166 facing the air electrode 114 and the fuel chamber 176 facing the fuel electrode 116, and prevents gas leakage from one electrode side to the other electrode side at the peripheral portion of the single cell 110. Is suppressed. Note that the unit cell 110 to which the separator 120 is joined is also referred to as a unit cell with a separator.

 The air electrode side frame 130 is a frame-shaped member having a substantially rectangular hole 131 formed in the vicinity of the center and penetrating in the vertical direction, and is formed of an insulator such as mica, for example. The hole 131 of the cathode side frame 130 forms an air chamber 166 facing the cathode 114. The air electrode side frame 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 opposite to the air electrode 114. . That is, the air electrode side frame 130 is sandwiched between the separator 120 and the interconnector 150. Therefore, a seal (compression seal) of the air chamber 166 is realized by the air electrode side frame 130. Further, the pair of interconnectors 150 included in the power generation unit 102 is electrically insulated by the air electrode side frame 130. Further, the air electrode side frame 130 has an oxidizing gas supply communication hole 132 that connects the oxidizing gas introduction manifold 161 and the air chamber 166, and an oxidizing gas that connects the air chamber 166 and the oxidizing gas discharge manifold 162. A discharge communication hole 133 is formed.

  The fuel electrode side frame 140 is a frame-like member having a substantially rectangular hole 141 formed in the vicinity of the center and penetrating vertically, and is formed of, for example, metal. The hole 141 of the fuel electrode side frame 140 forms a fuel chamber 176 facing the fuel electrode 116. The fuel electrode side frame 140 is in contact with the peripheral edge of the surface of the separator 120 facing the electrolyte layer 112 and the peripheral edge 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 communicating the fuel gas introduction manifold 171 and the fuel chamber 176, and a fuel gas discharge communication hole 143 communicating the fuel chamber 176 and the fuel gas discharge manifold 172. Are formed.

  The fuel electrode side current collector 144 is arranged 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 connecting the electrode facing portion 145 and the interconnector facing portion 146. , Stainless steel or the like. The electrode facing part 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 part 146 is on the surface of the interconnector 150 on the side facing the fuel electrode 116. In contact. However, as described above, since the lowermost power generation unit 102 in the fuel cell stack 100 does not include the lower interconnector 150, the interconnector facing portion 146 in the power generation unit 102 is located on the surface of the terminal plate 18. Is in contact with 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 formed of, for example, mica is disposed between the electrode facing portion 145 and the interconnector facing portion 146. Therefore, the anode-side current collector 144 follows the deformation of the power generation unit 102 due to a temperature cycle or a change in reaction gas pressure, and the anode 116 and the interconnector 150 (or the terminal plate 18) via the anode-side current collector 144. Good electrical connection is maintained.

  The cathode-side current collector 134 is arranged in the air chamber 166. The air electrode side current collector 134 is constituted by a plurality of current collector elements 135 having a substantially quadrangular prism shape, and is formed of, for example, ferritic stainless steel. The cathode-side current collector 134 is in contact with the surface of the cathode 114 opposite to the side facing the electrolyte layer 112 and the surface of the interconnector 150 facing the cathode 114. However, as described above, since the uppermost power generation unit 102 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. The air electrode side current collector 134 has such a configuration, and thus electrically connects the air electrode 114 and the interconnector 150 (or the first end plate 104). 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 oxidizing gas OG is supplied via a gas pipe (not shown) connected to a branch portion 29 of a gas passage member 27 provided at the position of the oxidizing gas introducing manifold 161. Then, the oxidizing gas OG is supplied to the oxidizing gas introduction manifold 161 through the branch portion 29 of the gas passage member 27 and the hole of the main body 28, and oxidized by the oxidizing gas introduction manifold 161 to each power generation unit 102. The gas is supplied to the air chamber 166 via the agent gas supply communication hole 132. As shown in FIGS. 3 and 5, the fuel gas FG is supplied via a gas pipe (not shown) connected to a branch portion 29 of a 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 28, and the fuel gas supply communication of each power generation unit 102 from the fuel gas introduction manifold 171 is performed. The fuel is supplied to the fuel chamber 176 through the hole 142.

  When the oxidizing 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 generation is performed in the single cell 110 by an electrochemical reaction of the oxidizing gas OG and the fuel gas FG. Will be 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 of the interconnectors 150 via the air electrode current collector 134, and the fuel electrode 116 is connected via the fuel electrode current collector 144. It is electrically connected to the other interconnector 150. The plurality of power generation units 102 included in the fuel cell stack 100 are electrically connected in series. Therefore, electric energy generated in each power generation unit 102 from the first protrusion 14 of the first end plate 104 and the second protrusion 16 of the terminal plate 18 functioning as an output terminal of the fuel cell stack 100. Taken out. Since the SOFC generates electric power at a relatively high temperature (for example, 700 ° C. to 1000 ° C.), the fuel cell stack 100 is heated (heated) until the high temperature can be maintained by the heat generated by the electric power generation after startup. (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 through the oxidant gas discharge communication hole 133 as shown in FIGS. The fuel cell stack 100 passes through the body 28 of the gas passage member 27 and the hole of the branch 29 provided at the position of the agent gas discharge manifold 162, and through a gas pipe (not shown) connected to the branch 29. Is discharged to the outside. 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 through the fuel gas discharge communication hole 143 as shown in FIGS. Through the body portion 28 of the gas passage member 27 and the hole of the branch portion 29 provided at the position of the discharge manifold 172, the gas exits to the outside of the fuel cell stack 100 via a gas pipe (not shown) connected to the branch portion 29. Is discharged.

A-3. Detailed configuration of the first nut 24:
The outlines of all cross sections of the first nut 24 parallel to the Z direction include a first opposite line 24A, a first opposing line 24B, a first outer peripheral line 24C, and a first chamfer line 24D. including. FIG. 2 and FIG. 3 illustrate the outline 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 on the opposite side (upper side) to the side facing the first insulating sheet 52, 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 forms the surface of the first nut 24 on the side (lower side) facing the first insulating sheet 52, 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 that constitutes the outer peripheral surface of the first nut 24 around the Z direction, 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 chamfered line 24D corresponds to a connecting line in the claims. That is, the corner between the lower surface of the first nut 24 and the outer peripheral surface around the Z direction is formed as a notch by being C-chamfered over the entire circumference. 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. The distance ΔD1 between the lower end of the first outer peripheral line 24C in the Z direction and the first insulating sheet 52 (see FIG. 2), and the lower end of the first outer peripheral line 24C in the XY plane direction The distance ΔD2 from the lower surface of the first nut 24 (see FIG. 2) is preferably 1 mm or more (C1 or more). Further, when viewed in the Z-axis direction, the third outer peripheral line 52B constituting the outer peripheral surface of the first insulating sheet 52 projects outside the first outer peripheral line 24C of the first nut 24 over the entire circumference. .

A-4. Detailed configuration of second end plate 106:
The outlines of all cross sections of the second end plate 106 parallel to the Z direction are a second opposite line 106A, a second opposed line 106B, a second outer peripheral line 106C, and a second chamfered line 106D. And FIGS. 2 and 3 illustrate the outline 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 forms the surface of the second end plate 106 on the opposite side (lower side) to the side facing the third insulating sheet 56, and is substantially formed on the third insulating sheet 56. It is a parallel straight line. The lower surface of the second end plate 106 corresponds to the fourth surface in the claims. The second facing line 106B is a straight line that constitutes 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 on the center side of the second end plate 106 from 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 106 </ b> C is a straight line that forms the outer peripheral surface of the second end plate 106 around the Z direction, extends in a direction (vertical direction) substantially orthogonal to the third insulating sheet 56, and The end (upper end) on the side of the insulating sheet 56 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 chamfered line 106D is a straight line connecting the end of the second opposed line 106B and the upper end of the second outer peripheral line 106C. The second chamfered 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 peripheral surface around the Z direction is cut out by being C-chamfered over the entire circumference. Thereby, a space is formed over the entire circumference between the upper peripheral portion of the second end plate 106 and the third insulating sheet 56. The distance ΔD3 between the upper end of the second outer peripheral line 106C in the Z direction and the third insulating sheet 56 (see FIG. 2) and the upper end of the second outer peripheral line 106C in the XY plane direction and the second end Is preferably 1 mm or more (C1 or more) with respect to the upper surface of the end plate 106 (see FIG. 2). Further, as viewed in the Z-axis direction, a fourth outer peripheral line 15B constituting the outer peripheral surface of the second main body 15 of the terminal plate 18 and a fifth outer peripheral line 56B constituting the outer peripheral surface of the third insulating sheet 56 And the second outer peripheral line 106C of the second end plate 106 are overlapped over 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 member 220, and a mica 230 disposed between the nut 210 and the plate member 220. The nut 210 is formed of stainless steel and has a diameter of about 16 mm. Since the outer shape of the nut 210 is the same as that of the first nut 24, the same reference numeral as that of the first nut 24 is used in FIG. 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 formed of stainless steel and has a diameter of about 25 mm. The mica 230, like the nut 210, has a diameter of approximately 16 mm and a thickness of 0.4 mm. Then, an insulation test was performed on four samples 200 each including each of the four nuts 210. Specifically, each sample 200 was placed in a temperature environment of 700 ° C., a DC voltage was applied between the nut 210 and the plate member 220, and the voltage was increased at a voltage increase rate of 6 V per second. The change in the discharge voltage between the plate member 220 and the discharge voltage was confirmed.

  FIG. 7 is a graph showing the results of an insulation test performed using sample 200. The vertical axis indicates the withstand voltage (V), and the horizontal axis indicates the chamfered line 24D and the upper end of the outer peripheral surface of the mica 230. Is the shortest distance L1. The shortest distance L1 can be calculated from the distances ΔD1 and ΔD2, for example. Here, the space 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 (the second chamfer line 106D), the longer the spatial distance, and the distance between the nut 210 and the plate 220. 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 extremely high.

  Note that, similarly to the first nut 24 and the first insulating sheet 52 shown in FIGS. 2 and 3, the outer diameter of the mica 230 may be larger than the outer diameter of the nut 210. In this case, the spatial distance is the total distance of the shortest distance L1, the thickness L2 of the mica 230, and the difference between the outer diameters of the mica 230 and the nut 210, and the spatial distance is longer than that shown in FIG. That is, as the outer diameter of the mica 230 is larger than the outer diameter of the nut 210, in other words, the longer the protrusion length of the mica 230 with respect to the nut 210, the higher the withstand voltage (insulation) between the nut 210 and the plate member 220. 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 peripheral surface around the Z direction is cut out by being C-chamfered over the entire circumference. Moreover, the third outer peripheral line 52B constituting the outer peripheral surface of the first insulating sheet 52 projects outwardly from the first outer peripheral line 24C of the first nut 24 over the entire circumference when viewed in the Z-axis direction. . For this reason, the spatial distance between the first nut 24 and the first end plate 104 is longer than that in a configuration in which the first nut 24 and the first insulating sheet 52 have the same size without a notch. Therefore, it is possible to suppress the current from leaking between the first nut 24 and the first end plate 104.

  In addition, the corner between the upper surface of the second end plate 106 and the outer peripheral surface around the Z direction is cut out over the entire circumference by being C-chamfered. For this reason, the spatial distance between the terminal plate 18 and the second end plate 106 is longer than that of the configuration having no notch, so that the third insulating sheet 56 is formed by the second main body 15 and the second Even if the size is the same as that of the second end plate 106, it is possible to suppress the current from leaking between the terminal plate 18 and the second end plate 106. The output terminal of the terminal plate 18 has a particularly high potential, but by applying the present invention, the leakage of current can be suppressed.

  Here, a method of increasing the spatial distance between the first conductive member (the first end plate 104, the terminal plate 18) and the second conductive member (the first nut 24, the 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 single cell 110 and forms a current path, the electric resistance of the first conductive member increases, and the output of the fuel cell stack 100 decreases. It may decrease. In particular, if a notch is formed in the second protruding portion 16 of the terminal plate 18, the electrical resistance of the output terminal becomes large, so that a rated output cannot be taken out from the output terminal, and the high output of the fuel cell stack 100 can be obtained. May not be able to respond to the demands for conversion. Further, as another method, the insulating members (the first insulating sheet 52 and the third insulating sheet 56) disposed between the first conductive member and the second conductive member are deformed by bending or the like. Can be added. 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 the present embodiment, as described above, the first conductive member and the first conductive member are formed without forming a cutout portion and using a flat insulating member. Leakage of current with the second conductive member can be suppressed.

  The first chamfered line 24D is a straight line located on a virtual 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, the spatial distance between the first nut 24 and the first end plate 104 is longer than when a part of the first chamfered line 24D protrudes below the virtual straight line W1. Leakage of current between the first nut 24 and the first end plate 104 can be more effectively suppressed. The second chamfered line 106D is a straight line located on a virtual straight line W2 connecting the end of the second opposed line 106B and the upper end of the second outer peripheral line 106C. For this reason, the spatial distance between the terminal plate 18 and the second end plate 106 is longer than when a part of the second chamfer line 106D protrudes above the virtual straight line W2. Leakage of current with the second end plate 106 can be more effectively suppressed.

  When viewed in the Z-axis direction, 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 Since they are located at the same position, it is possible to prevent 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 shifting. Can be.

B. Modification:
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 also possible.

  In the above embodiment, the first end plate 104 may be changed to an end plate having no output terminal, similarly to the second end plate 106. The end plate having no 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 insulation sheet as the third insulation sheet 56 and the same terminal plate as the terminal plate 18 are connected to the first end plate. They may be arranged in this order from the 104 side. In this case, the first end plate 104 and the insulating sheet correspond to a first conductive member and an insulating member in the claims. The second projecting portions 16 and the like of the terminal plate 18 are not limited to those projecting in the direction orthogonal to the arrangement direction, and may be any as long as they project in the direction intersecting the arrangement direction.

  Further, in the above embodiment, the third insulating sheet 56 and the second end plate 106 may be eliminated, and the terminal plate 18 and the second insulating sheet 54 may be brought into contact. In this case, the gas passage member 27 corresponds to a 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 described in the claims. 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 without the terminal plate 18 and the insulating material 58. In this case, the second end plate 106 corresponds to a first conductive member in claims, and the gas passage member 27 corresponds to a second conductive member in claims. The second insulating sheet 54 disposed between the end plate 106 and the gas passage member 27 corresponds to an insulating member in the claims.

  In the above embodiment, as the insulating member, a combination of a glass sealing material, a mica sheet, a glass sealing material and a mica sheet is exemplified, but not limited thereto, for example, a ceramic fiber sheet, a ceramic dust sheet, a glass ceramic composite agent, May be used.

  In the above embodiment, the first nut 24 may be a nut having no cutout portion. Even in such a configuration, if the first insulating sheet 52 protrudes from the nut over the entire circumference, it is possible to suppress the current from leaking between the nut and the first end plate 104. .

  In the above embodiment, the condition that the periphery of the lower surface of the first nut 24 is located inside the periphery of the upper surface 52A of the first insulating sheet 52 over the entire periphery when viewed in the Z-axis direction. Is satisfied, the outline of the first nut 24 in at least one cross section parallel to the Z direction is a first opposite line 24A, a first opposing line 24B, a first outer peripheral line 24C, and a first outer line 24C. May be included. For example, a notch is formed at a part of a corner between the lower surface of the first nut 24 and the outer peripheral surface around the Z direction, and at a position corresponding to that part, the first insulating sheet 52 is formed by the first insulating sheet 52. It may be configured to protrude from one nut 24. In addition, when viewed in the Z-axis direction, the condition that the periphery of the upper surface of the second end plate 106 is located inside the periphery of the lower surface 58A of the third insulating sheet 56 over the entire periphery can be satisfied. For example, the outline of at least one cross section of the second end plate 106 parallel to the Z direction includes a second opposite line 106A, a second opposed line 106B, a second outer peripheral line 106C, and a second outer line 106C. A configuration including the chamfer line 106D may be employed.

  Further, as shown in FIG. 8, the second chamfered line 106D may be an arc line 106E located below the virtual straight line W2. With this configuration, it is possible to more effectively suppress the current from leaking between the terminal plate 18 and the second end plate 106 with a relatively simple shape.

  Further, in the above embodiment, the number of the power generation units 102 included in the fuel cell stack 100 is merely an example, and the number of the power generation units 102 is appropriately determined according to the output voltage required for the fuel cell stack 100 and 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 side opposite to the head of the bolt 22. May be used.

  In the above embodiment, the space between the outer peripheral surface of the shaft portion of each bolt 22 and the inner peripheral surface of each through-hole 108 is used as each manifold. An axial hole may be formed in the portion, 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.

  Further, 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, but even in such a case. Alternatively, the two power generation units 102 may include respective interconnectors 150. In the above-described embodiment, the upper interconnector 150 of the power generation unit 102 located at the top in the fuel cell stack 100 and the lower interconnector 150 below the power generation unit 102 located at the lowest 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 integrated members. It may be. Further, the fuel electrode side frame 140 instead of the air electrode side frame 130 may be an insulator. Further, the air electrode side frame 130 and the fuel electrode side frame 140 may have a multilayer structure.

  Further, the material forming each member in the above embodiment is merely an example, and each member may be formed of another material.

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

  In this specification, that the member B and the member C oppose each other across the member (or a part having the member, hereinafter the same) 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. This includes a mode in which another component is interposed between the member A and the member B or the 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.

  Further, in the above-described embodiment, the SOFC that generates electric power by utilizing an electrochemical reaction between hydrogen contained in the fuel gas and oxygen contained in the oxidizing gas is targeted. The present invention can be similarly applied to an electrolytic cell unit which is a minimum unit of a solid oxide type electrolytic cell (SOEC) that generates hydrogen by utilizing the same, or an electrolytic cell stack including a plurality of electrolytic cell units. The configuration of the electrolysis cell stack is well-known as described in, for example, JP-A-2014-207120, and thus will not be described in detail here, but is generally similar to the fuel cell stack 100 in the above-described embodiment. 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, during the operation of the electrolysis cell stack, 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. Steam as the source gas is supplied. Thereby, an electrolysis reaction of water occurs in each electrolytic cell unit, hydrogen gas is generated in the fuel chamber 176, and hydrogen is taken out of the electrolytic 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 cutout portion is formed in the second conductive member, or the insulating member is protruded from the second conductive member. With such a configuration, there is an effect that it is possible to suppress a current from leaking between the first conductive member and the second conductive member.

  In the above embodiments, the solid oxide fuel cell (SOFC) has been described as an example. However, the present invention is not limited to the solid polymer fuel cell (PEFC), the phosphoric acid fuel cell (PAFC), and the molten carbonate fuel cell. It is also applicable 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 opposed line 24C: First outer peripheral line 24D: First chamfered line 25: Nut 27: Gas passage member 28: Body portion 29: Branch portion 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 130: air electrode side frame 131: hole 132 : Oxidizing gas supply communication hole 133: Oxidizing 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: Oxidizing gas OOG: Oxidizing off gas W1, W2: Virtual straight line

Claims (9)

A plurality of single cells arranged side by side in a first direction, each including an air electrode and a fuel electrode facing each other in the first direction with an electrolyte layer and the electrolyte layer interposed therebetween;
A plate-shaped 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 a first surface that is the one surface of the first conductive member;
An end plate-shaped end plate adjacent to the second surface that is the one side surface of the insulating member, and having a conductive shape ,
In the first direction, a periphery of a third surface, which is a surface on the other side in the first direction, of the end plate extends over the entire periphery from a periphery of the second surface of the insulating member. An electrochemical reaction cell stack, which is located inside. The electrochemical reaction cell stack according to claim 1, wherein:
The first conductive member includes a flat 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. And an electrochemical reaction cell stack. An electrochemical reaction cell stack according to claim 1 or 2, wherein:
The outer shape line of at least one cross section of the end plate parallel to the first direction is a parallel line parallel to the first direction in which the other end is separated from the insulating member, and the first direction. An electrochemical reaction cell comprising: an end of the third surface located inside the parallel line when viewed from the eye; and a connecting line connecting the other end of the parallel line. stack. The electrochemical reaction cell stack according to claim 3, wherein
The connecting line is located at a position 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 at a position on the one side of the virtual straight line. Electrochemical reaction cell stack characterized. An electrochemical reaction cell stack according to claim 4, wherein
The electrochemical reaction cell stack, wherein the connecting line is a straight line or an arc line connecting an 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, wherein
The electrochemical reaction cell stack according to claim 1, wherein the outlines of all cross sections of the end plate 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, wherein
Fourth the end plate and the outline of at least one cross-section parallel to the first direction of the insulating member is a surface of the one side of said end plate from an end of said third surface of said end plate A straight line extending in parallel to the first direction up to an end of the surface of the insulating member, and in the first direction, the end of the second surface of the insulating member is configured such that the electrochemical reaction is based on the straight line. The electrochemical reaction cell stack, which is located at a position on the outer peripheral side of the cell stack. An electrochemical reaction cell stack according to any one of claims 1 to 7, wherein:
In the first conductive member, the insulating member and the end plate , a through hole that forms a gas flow path is formed,
An electrochemical reaction cell stack according to the first direction, wherein at least one side of each of the first conductive member, the insulating member, and the end plate is located at the same position. The electrochemical reaction cell stack according to any one of claims 1 to 8, wherein
The said electrochemical reaction cell stack is a fuel cell stack which performs electric power generation, The electrochemical reaction cell stack characterized by the above-mentioned.

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