JP2019021502A - Conductive member, electrochemical reaction unit, and electrochemical reaction cell stack - Google Patents

Abstract

To suppress generation of crack in a conductive member.SOLUTION: The first conductive portion of a conductive member has an approximate plate shape orthogonal to a first direction, provided with a through hole. The second conductive portion of the conductive member includes a plate part extending from inner periphery of the first conductive portion forming the through hole. The through hole formed on the first conductive portion has a first hole part, a second hole part and a third hole part when seen from the first direction view. In a second direction orthogonal to the border lines of the first and second conductive portions, the first hole part entirely faces a virtual segment connecting two intersection points of a straight line passing the border line and the inner periphery of the first conductive portion. The second and third hole parts are located, respectively, at the opposite side to the first hole part for the virtual segment in the second direction and are successive to the first hole part, respectively, on the one and the other sides of the border line in a third direction parallel with the virtual segment.SELECTED DRAWING: Figure 12

Description

  The technique disclosed by this specification is related with an electroconductive member.

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

  As a current collecting member that constitutes a power generation unit, a current collecting member manufactured by punching or bending a single metal plate is known (for example, see Patent Document 1). In the current collecting member, a portion (hereinafter referred to as “first conductive portion”) constituted by a portion other than the bent portion of the metal plate has a predetermined direction (hereinafter referred to as “first direction”). It is a substantially flat plate-like portion orthogonal to the above. A through hole is formed in the first conductive portion. Further, the second conductive portion constituted by the bent portion of the metal plate is connected to the first conductive portion from the inner periphery of the first conductive portion forming the through hole in the first direction view. It is a part including a plate-like part extending in a direction intersecting the surface of the sex part.

JP2013-55042A

  In the conventional current collecting member described above, for example, during the operation of SOFC, the stress generated when the current collecting member repeats thermal expansion / contraction is caused by a specific location of the current collecting member (for example, in the current collecting member). , At the end of the through hole in the second direction (however, the direction opposite to the tip side of the second conductive portion) perpendicular to the boundary line between the first conductive portion and the second conductive portion Among the facing portions, the portion is concentrated at a portion constituting a bent portion (that is, a hole end facing portion described later, and the hole end facing portion is a part of the current collecting member). There exists a subject that a crack may generate | occur | produce in the specific location in a current collection member.

 It is to be noted that such a problem is a problem that constitutes an electrolytic cell unit that is a structural unit of a solid oxide electrolytic cell (hereinafter, also referred to as “SOEC”) that generates hydrogen using an electrolysis reaction of water. This is a problem common to electric members. In the present specification, the fuel cell power generation unit and the electrolysis cell unit are collectively referred to as an electrochemical reaction unit. Such a problem is not limited to SOFC and SOEC, but is common to other types of electrochemical reaction units. In addition, such a problem is not limited to a current collecting member manufactured by punching or bending a single metal plate, but is common to current collecting members manufactured by other methods. It is. Furthermore, such a problem is not limited to the current collecting member that constitutes the electrochemical reaction unit, but includes a first plate having a substantially flat plate shape that includes a metal and is orthogonal to the first direction, and has a through hole. A first portion including a portion and a plate-like portion including a metal and extending in a direction intersecting the surface of the first conductive portion from the inner periphery of the first conductive portion forming the through hole in the first direction view. It is a common problem in general for conductive members comprising two conductive portions.

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

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

(1) The conductive member disclosed in the present specification includes a metal, has a substantially flat plate shape orthogonal to the first direction, includes a first conductive portion in which a through hole is formed, and a metal, 2nd electroconductivity including the plate-shaped part extended in the direction which cross | intersects the surface of the said 1st electroconductive part from the inner periphery of the said 1st electroconductive part which forms the said through-hole in the said 1st direction view A through-hole in a second direction perpendicular to a boundary line between the first conductive portion and the second conductive portion in the first direction view. A first hole portion facing the entire imaginary line segment connecting two intersections between a straight line passing through the boundary line and an inner circumference of the first conductive portion, and in the second direction, A third side that is located on the opposite side of the first hole portion with respect to the virtual line segment and is parallel to the virtual line segment A second hole portion continuous with the first hole portion on one side of the boundary line, and in the second direction opposite to the first hole portion with respect to the virtual line segment. A third hole portion that is located and is continuous with the first hole portion on the other side of the boundary line in the third direction. In the conductive member, the through hole formed in the first conductive portion is divided into the first hole portion, the second hole portion, and the third hole portion as described above by the virtual line segment described above. It is a structure that can be divided. Therefore, in the present conductive member, the hole end facing portion in the conductive member does not coincide with the position of the boundary line between the first conductive portion and the second conductive portion. In other words, the hole end facing portion in the conductive member intersects the surface substantially parallel to the first conductive portion, such as the position of the boundary line between the first conductive portion and the second conductive portion. It is not continuous with the plate-like portion extending in the direction (for example, it is not bent), and has a substantially flat plate shape substantially parallel to the first conductive portion. Here, the hole end facing portion in the conductive member is in the second direction orthogonal to the boundary line between the first conductive portion and the second conductive portion (however, the tip side of the second conductive portion) Among the portions facing the end portion of the through hole in the opposite direction), a portion constituting a bent portion. Therefore, according to the present conductive member, when the conductive member repeats thermal expansion and thermal contraction, for example, during the operation of SOFC, stress is applied to a specific portion (for example, the hole end facing portion) of the conductive member. Can be prevented from concentrating. Therefore, according to this electroconductive member, it can suppress that a crack generate | occur | produces in the specific location of an electroconductive member.

(2) In the conductive member, a width of the first conductive portion and a width of the second conductive portion on the virtual line segment may be equal to each other. In this conductive member, there is no step at the position of the boundary line between the first conductive portion and the second conductive portion. Therefore, according to the present conductive member, it is possible to effectively suppress stress concentration at a specific portion of the conductive member (for example, the hole end facing portion), and at a specific portion of the conductive member. It can suppress effectively that a crack generate | occur | produces.

(3) In the conductive member, each of the first conductive portion and the second conductive portion is formed on a plate-like metal member containing Cr and the surface of the metal member, And a coating layer that suppresses the diffusion of Cr from the metal member. According to this electroconductive member, it can suppress that a crack generate | occur | produces in a coating layer in the specific location (for example, part which comprises a hole edge part opposing part) of a metal member. Therefore, according to this conductive member, the diffusion of Cr from the metal member can be effectively suppressed by the coating layer.

(4) In the said electroconductive member, it is good also as a structure which satisfy | fills the following formula | equation (1).
2 × ta <ΔWa / 2 <Wam / 2 (1)
However,
Wam: the metal member constituting the second conductive portion at the first position separated from the boundary line by a distance L1 along the surface of the second conductive portion in a direction perpendicular to the boundary line. Width (hereinafter referred to as “width Wam at the position of distance L1”)
ΔWa: difference (Wao−Wam) obtained by subtracting the width (width at the position of the distance L1) Wam from the opening width Wao of the metal member at the position separated from the boundary line in the second direction by the distance L1.
ta: thickness of the covering layer at the first position According to the conductive member, the width (width at the position of the distance L1) Wam of the metal member constituting the second conductive portion is made relatively large. In addition, even when a coating layer is formed on the surface of the metal member, the occurrence of interference between members (parts) can be suppressed. Therefore, according to the present conductive member, the current collecting function by the conductive member is reduced as the width (width at the position of the distance L1) Wam of the metal member constituting the second conductive portion is reduced. The occurrence of peeling of the coating layer and damage to the member due to interference between members (parts) can be suppressed.

(5) In the said electroconductive member, it is good also as a structure which satisfy | fills the following formula | equation (2) and Formula (3).
ΔWb / 2 <Wbm / 2 (2)
Σtb <D (3)
However,
Wbm: the second direction from the boundary line in the second direction in a virtual state in which the second conductive part is rotated with respect to the boundary line so as to be substantially parallel to the first conductive part. The width of the metal member constituting the second conductive portion at the second position separated by the distance L2 (hereinafter referred to as “the width Wbm at the position of the distance L2”).
ΔWb: difference (Wbo−Wbm) obtained by subtracting the width (width at the position of the distance L2) Wbm from the opening width Wbo of the metal member constituting the first hole portion at the second position in the virtual state. )
D: The first conductivity that forms the through hole from a point on the outer periphery of the metal member constituting the second conductive portion in the third direction at the second position in the virtual state. The shortest distance Σtb to the inner periphery of the portion: the sum of the thicknesses of the covering layers at the both ends of the shortest distance According to this conductive member, when the metal member is manufactured by bending, the second conductive The width (width at the position of the distance L2) Wbm of the metal member constituting the portion 232 can be made relatively large, and the coating layer can be uniformly formed on the surface of the metal member. Therefore, according to the present conductive member, the current collecting function by the conductive member decreases as the width (width at the position of the distance L2) Wbm of the metal member constituting the second conductive portion 232 decreases. While avoiding this, diffusion of Cr from the metal member can be effectively suppressed by the coating layer.

(6) In the conductive member, the coating layer may include at least one of a spinel oxide and a perovskite oxide. According to this conductive member, the diffusion of Cr from the metal member can be effectively suppressed by the coating layer.

(7) In the conductive member, among the corners forming the second hole part, the corner part closest to the third hole part in the third direction and the third hole part are formed. At least one of the corners that are closest to the second hole portion in the third direction may be an R shape. Of the corners forming the second hole part, the corner closest to the third hole part in the third direction and the second of the corners forming the third hole part in the third direction. The corner portion closest to the hole portion of 2 is the hole end portion facing portion of the conductive member. In this conductive member, since the hole end portion facing portion in the conductive member has an R shape, it is possible to extremely effectively suppress the concentration of stress and to suppress the occurrence of cracks extremely effectively. can do.

(8) In the conductive member, the conductive member may be a conductive member for a solid oxide electrochemical reaction unit. According to this electroconductive member, it can suppress that a crack generate | occur | produces in the specific location of the electroconductive member for electrochemical reaction units of a solid oxide form.

(9) An electrochemical reaction unit disclosed in the present specification includes an electrochemical reaction unit including an electrolyte layer containing a solid oxide and an air electrode and a fuel electrode facing each other in a first direction with the electrolyte layer interposed therebetween. A conductive member disposed on one side of the first direction with respect to the cell and the electrochemical reaction unit cell and functioning as a current collecting member electrically connected to the air electrode or the fuel electrode; Is provided. According to this electrochemical reaction unit, it is possible to suppress the occurrence of cracks at specific locations of the conductive member that functions as a current collecting member.

(10) In the electrochemical reaction unit, the electrochemical reaction unit may be a fuel cell power generation unit. According to the present electrochemical reaction unit, it is possible to suppress the occurrence of cracks at a specific portion of the conductive member that functions as a current collecting member for the fuel cell power generation unit.

(11) In the electrochemical reaction cell stack disclosed in the present specification, in the electrochemical reaction cell stack including the plurality of electrochemical reaction units arranged in the first direction, the plurality of electrochemical reaction units At least one is the electrochemical reaction unit. According to this electrochemical reaction cell stack, it is possible to suppress the occurrence of cracks at specific locations of the conductive member included in at least one electrochemical reaction unit constituting the electrochemical reaction cell stack.

  The technology disclosed in the present specification can be realized in various forms. For example, a conductive member, a conductive member, and an electrochemical reaction single cell (fuel cell single cell or electrolytic single cell) Reaction unit (fuel cell power generation unit or electrolysis cell unit), electrochemical reaction cell stack (fuel cell stack or electrolysis cell stack) comprising a plurality of electrochemical reaction units, a manufacturing method thereof, etc. It is possible.

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 explanatory drawing which shows XY cross-section structure of the electric power generation unit 102 in the position of VI-VI of FIG. 4 and FIG. FIG. 6 is an explanatory diagram showing an XY cross-sectional configuration of a power generation unit at a position VII-VII in FIGS. 4 and 5. 5 is a flowchart illustrating an example of a method for manufacturing the air electrode side current collecting member 200. 5 is an explanatory view showing an example of a method for manufacturing the air electrode side current collecting member 200. FIG. 5 is an explanatory view showing an example of a method for manufacturing the air electrode side current collecting member 200. FIG. 5 is an explanatory view showing an example of a method for manufacturing the air electrode side current collecting member 200. FIG. It is explanatory drawing which shows the detailed structure of the air electrode side current collection member 200 in this embodiment. It is explanatory drawing which shows the detailed structure of the air electrode side current collection member 200 in this embodiment. It is explanatory drawing which shows the virtual state which rotated the 2nd electroconductive part 232 of the air electrode side current collection member 200 so that it might become a substantially parallel attitude | position to the 1st electroconductive part 231 on the basis of the boundary line BL. It is explanatory drawing which shows the structure of the air electrode side current collection member 200X in a comparative example. It is explanatory drawing which shows the detailed structure of the fuel electrode side current collection member 300 in this embodiment. It is explanatory drawing which shows the detailed structure of the air electrode side current collection member 200 in a modification. It is explanatory drawing which shows the detailed structure of the air electrode side current collection member 200 in a modification. Explanatory drawing which shows the virtual state which rotated the 2nd electroconductive part 232 of the air electrode side current collection member 200 in a modification so that it might become a substantially parallel attitude | position to the 1st electroconductive part 231 on the basis of the boundary line BL. It is.

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 XZ of the fuel cell stack 100 at a position II-II in FIG. 1 (and FIGS. 6 and 7 described later). FIG. 3 is an explanatory diagram showing a cross-sectional configuration, and 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. 1 (and FIGS. 6 and 7 described later). In each figure, XYZ axes orthogonal to each other for specifying the direction are shown. In this specification, for the sake of convenience, the positive direction of the Z axis is referred to as the upward direction, and the negative direction of the Z axis is referred to as the downward direction. However, the fuel cell stack 100 is actually different from such an orientation. It may be installed. The same applies to FIG.

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

  A plurality of (eight in the present embodiment) holes penetrating in the vertical direction are formed in the peripheral portion around the Z direction of each layer (power generation unit 102, end plates 104, 106) constituting the fuel cell stack 100. The holes formed in each layer and corresponding to each other communicate with each other in the vertical direction to form a communication hole 108 extending in the vertical direction from one end plate 104 to the other end plate 106. In the following description, the holes formed in each layer of the fuel cell stack 100 to form the communication holes 108 may also be referred to as the communication holes 108.

  Bolts 22 extending in the vertical direction are inserted into the communication holes 108, and the fuel cell stack 100 is fastened by the bolts 22 and nuts 24 fitted on both sides of the bolts 22. 2 and 3, between the nut 24 fitted on one side (upper side) of the bolt 22 and the upper surface of the end plate 104 constituting the upper end of the fuel cell stack 100, and the bolt An insulating sheet 26 is interposed between the nut 24 fitted on the other side (lower side) of 22 and the lower surface of the end plate 106 constituting the lower end of the fuel cell stack 100. However, in a place where a gas passage member 27 described later is provided, an insulating sheet disposed between the nut 24 and the surface of the end plate 106 on the upper and lower sides of the gas passage member 27 and the gas passage member 27, respectively. 26 is interposed. The insulating sheet 26 is made of, for example, a mica sheet, a ceramic fiber sheet, a ceramic powder sheet, a glass sheet, a glass ceramic composite agent, or the like.

  The outer diameter of the shaft portion of each bolt 22 is smaller than the inner diameter of each communication 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 communication 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 communication hole 108 through 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 communication holes 108 through which the bolts 22B are inserted contains the oxidant off-gas OOG that 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 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) positioned at the position and the communication hole 108 through 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 communication hole 108 through which the bolt 22E is inserted is a fuel cell stack 1 that uses the fuel off-gas FOG that is a gas discharged from the fuel chamber 176 of each power generation unit 102 as 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 has a hollow cylindrical main body portion 28 and a hollow cylindrical branch portion 29 branched from the 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.

(Configuration of end plates 104 and 106)
The pair of end plates 104 and 106 are substantially rectangular flat plate-shaped conductive members, and are formed of, for example, stainless steel. One end plate 104 is disposed on the upper side of the power generation unit 102 located on the uppermost side, and the other end plate 106 is disposed on the lower side of the power generation unit 102 located on the lowermost side. A plurality of power generation units 102 are held in a pressed state by a pair of end plates 104 and 106. The upper end plate 104 functions as a positive output terminal of the fuel cell stack 100, and the lower end plate 106 functions as a negative output terminal of the fuel cell stack 100.

(Configuration of power generation unit 102)
FIG. 4 is an explanatory diagram showing an XZ cross-sectional configuration of a plurality of power generation units 102 at the same position as the cross section shown in FIG. 2, and FIG. 5 shows a plurality of power generation units 102 at the same position as the cross section shown in FIG. It is explanatory drawing which shows a YZ cross-section structure. In the upper part of FIG. 5, an enlarged YZ cross-sectional configuration of a part of the power generation unit 102 is shown. 6 is an explanatory diagram showing an XY cross-sectional configuration of the power generation unit 102 at the position VI-VI in FIGS. 4 and 5, and FIG. 7 is a power generation unit at the position VII-VII in FIGS. 4 and 5. It is explanatory drawing which shows XY cross-section structure of 102. FIG.

  As shown in FIGS. 4 and 5, the power generation unit 102 includes a single cell 110, a separator 120, an air electrode side frame 130, an air electrode side current collecting member 200, a fuel electrode side frame 140, and a fuel electrode side. A current collecting member 300 and a pair of interconnectors 150 constituting the uppermost layer and the lowermost layer of the power generation unit 102 are provided. The separator 120, the air electrode side frame 130, the fuel electrode side frame 140, and the periphery of the interconnector 150 around the Z direction are formed with holes corresponding to the communication holes 108 through which the bolts 22 are inserted.

  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. Further, since the fuel cell stack 100 includes the pair of end plates 104 and 106, the power generation unit 102 located at the top in the fuel cell stack 100 does not include the upper interconnector 150 and is located at the bottom. The power generation unit 102 does not include the lower interconnector 150 (see FIGS. 2 and 3).

Further, as shown in the partially enlarged view of FIG. 5, in the present embodiment, the surface of the interconnector 150 on the side facing the air electrode 114 is covered with a conductive coating layer 152. The covering layer 152 includes, for example, a spinel oxide (for example, Mn _1.5 Co _1.5 O ₄ , MnCo ₂ O ₄ , ZnCo ₂ O ₄ , ZnMn ₂ O ₄ , ZnMnCoO ₄ , CuMn ₂ O ₄ ) or the like. A perovskite oxide (for example, a composite oxide containing La and Sr) is included. In the following description, unless otherwise specified, the interconnector 150 means “the interconnector 150 covered with the covering layer 152”.

  The single cell 110 includes an electrolyte layer 112, a fuel electrode (anode) 116 disposed on one side (lower side) of the electrolyte layer 112 in the vertical direction (first direction), and the other side of the electrolyte layer 112 in the vertical direction. And an air electrode (cathode) 114 disposed on the upper side. The single cell 110 of this embodiment is a fuel electrode-supported single cell that supports the other layers (the electrolyte layer 112 and the air electrode 114) that constitute the single cell 110 with the fuel electrode 116.

  The electrolyte layer 112 is a substantially rectangular flat plate member as viewed in the Z direction, and is a dense layer. The electrolyte layer 112 is formed of a solid oxide such as YSZ (yttria stabilized zirconia), ScSZ (scandia stabilized zirconia), SDC (samarium doped ceria), GDC (gadolinium doped ceria), perovskite oxide, and the like. Yes. That is, 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 air electrode 114 is a substantially rectangular flat plate-shaped member smaller than the electrolyte layer 112 when viewed in the Z direction, and is a porous layer. The air electrode 114 is made of, for example, a perovskite oxide (for example, LSCF (lanthanum strontium cobalt iron oxide), LSM (lanthanum strontium manganese oxide), LNF (lanthanum nickel iron)).

  The fuel electrode 116 is a substantially rectangular flat plate member having substantially the same size as the electrolyte layer 112 when viewed in the Z direction, and is a porous layer. The fuel electrode 116 is formed of, for example, a cermet made of Ni and oxide ion conductive ceramic particles (for example, YSZ).

  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.

 As shown in FIGS. 4 to 6, 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. ing. 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. . 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.

  As shown in FIGS. 4, 5, and 7, 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 formed 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.

  As shown in FIGS. 4, 5, and 7, the fuel electrode side current collecting member 300 is disposed in the fuel chamber 176. The fuel electrode side current collecting member 300 is made of a conductive material such as nickel or a nickel alloy, for example. The fuel electrode side current collecting member 300 is in contact with the surface of the fuel electrode 116 opposite to the side facing the electrolyte layer 112, and is in contact with the surface of the interconnector 150 facing the fuel electrode 116. However, as described above, the lowermost power generation unit 102 in the fuel cell stack 100 does not include the lower interconnector 150, and thus the fuel electrode side current collecting member 300 in the power generation unit 102 includes the interconnector 150. Instead of the lower end plate 106. Since the fuel electrode side current collecting member 300 has such a configuration, the fuel electrode 116 and the interconnector 150 (or the end plate 106) are electrically connected. The configuration of the fuel electrode side current collecting member 300 will be described in detail later. The fuel electrode side current collecting member 300 corresponds to a conductive member in the claims.

As shown in FIGS. 4 to 6, the air electrode side current collecting member 200 is disposed in the air chamber 166. As shown in the partially enlarged view of FIG. 5, the air electrode side current collecting member 200 includes a metal member 210 and a conductive coating layer 220 formed on the surface of the metal member 210. The metal member 210 is formed of a metal containing Cr, such as ferritic stainless steel. Further, the outermost surface side of the metal member 210 is constituted by an oxide film layer 218 containing Cr oxide (for example, Cr ₂ O ₃ (chromia)).

The covering layer 220 is formed of, for example, a spinel oxide (for example, Mn _1.5 Co _1.5 O ₄ , MnCo ₂ O ₄ , ZnCo ₂ O ₄ , ZnMn ₂ O ₄ , ZnMnCoO ₄ , CuMn ₂ O _4, etc.). ) And perovskite type oxides (for example, complex oxides containing La and Sr). The coating layer 220 is formed on the surface of the metal member 210 with a substantially uniform thickness (for example, 1 μm to 50 μm, preferably 5 μm to 30 μm). The coating layer 220 suppresses the diffusion of Cr from the metal member 210. Thereby, for example, the occurrence of Cr poisoning of the air electrode 114 is suppressed.

  The air electrode side current collecting member 200 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 collecting member 200 in the power generation unit 102 includes the interconnector 150. Instead, it contacts the upper end plate 104. The air electrode side current collecting member 200 has such a configuration, and electrically connects the air electrode 114 and the interconnector 150 (or the end plate 104). The configuration of the air electrode side current collecting member 200 will be described in detail later. The air electrode side current collecting member 200 corresponds to the conductive member in the claims.

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 the upper interconnector 150 via the air electrode side current collecting member 200, and the fuel electrode 116 is connected via the fuel electrode side current collecting member 300. It is electrically connected to the lower interconnector 150. That is, the plurality of power generation units 102 included in the fuel cell stack 100 are electrically connected in series. Therefore, electrical energy generated in each power generation unit 102 is taken out from the end plates 104 and 106 that function as output terminals of the fuel cell stack 100. Since SOFC generates power at a relatively high temperature (for example, 700 ° C. to 1000 ° C.), the fuel cell stack 100 is heated by a heater (after the start-up until the high temperature can be maintained by the heat generated by the power generation. (Not shown).

  The oxidant off-gas OOG discharged from the air chamber 166 of each power generation unit 102 is discharged to the oxidant gas discharge manifold 162 through 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 description of the air electrode side current collecting member 200:
A-3-1. Manufacturing method of air electrode side current collecting member 200:
In describing the air electrode side current collecting member 200 in detail, a method for manufacturing the air electrode side current collecting member 200 will be described first for easy understanding. FIG. 8 is a flowchart showing an example of a method for manufacturing the air electrode side current collecting member 200. 9-11 is explanatory drawing which shows an example of the manufacturing method of the air electrode side current collection member 200. FIG.

  First, a metal member 210 is prepared, and a plurality of slits SL are formed in the metal member 210 (S110, see FIG. 9). Note that the metal member 210 referred to here is the one before processing, and the metal member 210 (see FIG. 5) constituting the air electrode side current collecting member 200 described above is obtained by performing the processing described below. Is. The metal member 210 is a substantially flat plate member made of a metal containing Cr (for example, ferritic stainless steel), and the thickness thereof is, for example, 0.05 mm to 1 mm, preferably 0.1 mm to 0.5 mm. . The metal member 210 corresponds to a metal plate in the claims.

  The shape of each slit SL formed in the metal member 210 in a plan view (viewed in the Z-axis direction) is, for example, substantially U-shaped (that is, predetermined along three sides of four sides constituting a rectangle). The shape having a width of 2). The slit SL may be a defective portion formed by cutting a predetermined portion of the metal member 210 by punching or the like, or may be a notch formed by a blade-shaped tool. That is, in the present specification, the term “slit (or“ hole ”)” is a concept including notches. The width Ws of the slit SL is, for example, 2 μm to 3 mm, preferably 0.5 mm to 2 mm. The width Ws of the slit SL may be substantially constant throughout the slit SL, or may be different at each position in the slit SL.

  Further, in the present embodiment, a plurality of slits SL in the same direction are formed in the metal member 210 at a predetermined interval along a direction (X-axis direction in FIG. 9) in which two of the three sides face each other. The slit group SLG composed of the plurality of slits SL arranged in a line is arranged at a predetermined interval along a direction (Y-axis direction in FIG. 9) perpendicular to the direction in which the two sides face each other. Arranged to be lined up. That is, the plurality of slits SL are arranged on the metal member 210 in a substantially lattice shape.

  Next, using a jig having a linear edge portion, the specific portion SP facing each of the plurality of slits SL in the metal member 210 is bent at a predetermined position in a direction perpendicular to the predetermined direction ( S120, see FIG. 10). The predetermined direction at the predetermined position at the time of bending is a direction (X-axis direction) parallel to the first virtual line VL1 at the position of the first virtual line VL1 shown in FIGS. . That is, the specific portion SP is bent and raised in the direction (Y-axis direction) perpendicular to the first virtual line VL1 at the position of the first virtual line VL1. Thus, the specific portion SP facing the slit SL in the metal member 210 is not limited to a portion facing the entire slit SL, and may be a portion facing a part of the slit SL. In addition, the shape of the specific portion SP in a state before bending is seen in a plan view (viewed in the Z-axis direction) is, for example, a rectangle.

  As shown in FIG. 9, the first imaginary straight line VL1 includes the slit SL formed in the metal member 210 in the state before the specific portion SP is bent and the first slit portion SLP1 in the Z-axis direction view. The straight line is virtually divided into a second slit portion SLP2 and a third slit portion SLP3. Here, the first slit portion SLP1 is a portion excluding both ends in the extending direction of the slit SL, and the second slit portion SLP2 and the third slit portion SLP3 are portions corresponding to the both ends. That is, the second slit portion SLP2 is located on the opposite side (Y-axis positive direction side) of the first virtual straight line VL1 from the first slit portion SLP1, and the predetermined position at the predetermined position is set. This is a portion continuous with the first slit portion SLP1 on one side (X-axis negative direction side) in the direction (the direction parallel to the first virtual line VL1 at the position of the first virtual line VL1). In addition, the third slit portion SLP3 is located on the opposite side (Y-axis positive direction side) from the first slit portion SLP1 with respect to the first imaginary straight line VL1, and the predetermined position at the predetermined position is set. This is a portion that continues to the first slit portion SLP1 on the other side (X-axis positive direction side in FIG. 9) in the direction (the direction parallel to the first virtual line VL1 at the position of the first virtual line VL1). Thus, in the present embodiment, the first virtual straight line VL1 that defines the predetermined direction at the predetermined position when the specific portion SP is bent up is a comparative virtual straight line VL0 (slit as shown in FIG. The slit SL is set not as a straight line that virtually divides into a plurality of parts, but as a straight line that virtually divides the slit SL into the three parts (SLP1, SLP2, SLP3).

  In the present embodiment, each specific portion SP is (one) at a time in a state where the linear edge portion of the jig is applied to the position of the first virtual straight line VL1 in each slit SL constituting the slit group SLG described above. Bend in process) Such bending of the specific portion SP in the slit group SLG unit is sequentially performed. Note that the bending of the specific portion SP does not necessarily have to be performed in units of the slit group SLG, and may be performed in order in units of the specific portions SP, or the specific portions arranged in the same row. The SP may be executed at one time (in one step), or may be executed at once (in one step) for all the specific portions SP. Also, the angle of bending of the specific portion SP (that is, the angle formed by the surface of the first metal portion 211 (surface substantially perpendicular to the Z axis) and the surface of the second metal portion 212 (described later)) θ1 is For example, it is 5 degrees or more and 90 degrees or less, preferably 5 degrees or more and 20 degrees or less.

  When the bending of the specific portion SP is completed (S120), as shown in FIG. 10, the metal member 210 includes a substantially flat first metal portion 211 constituted by portions other than the specific portion SP, and the metal member 210. And a second metal portion 212 constituted by the substantially flat specific portion SP bent and raised. In this state, the substantially flat plate-like first metal portion 211 has a plurality of through holes (hereinafter referred to as “metal member penetration” corresponding to the region occupied by the slit SL and the specific portion SP in a state before the specific portion SP is bent and raised. This means that HOm is formed.

  Next, using a jig having a linear edge portion, the tip end portion EP of each of the plurality of second metal portions 212 of the metal member 210 is bent at a predetermined position in a direction perpendicular to the predetermined direction. (See S130, FIG. 11). The predetermined direction at the predetermined position at the time of bending is a direction (X-axis direction) parallel to the second virtual line VL2 at the position of the second virtual line VL2 shown in FIGS. That is, the tip portion EP is bent in the direction (Y-axis direction) perpendicular to the second virtual line VL2 at the position of the second virtual line VL2. In addition, the shape of the tip end portion EP in a state after being bent in a plan view (viewed in the Z-axis direction) is, for example, a rectangle. Further, the bending direction of the tip portion EP (the rotation direction around the second imaginary straight line VL2) is opposite to the bending direction of the specific portion SP (the rotation direction around the first imaginary straight line VL1). It is. Note that the bending angle (that is, the angle formed by the surface of the third metal portion 213 and the surface of the fourth metal portion 214) θ2 of the distal end portion EP is, for example, 5 degrees or more, and preferably 90 degrees. Degrees or less, more preferably 30 degrees or less.

  In the present embodiment, the bending of the tip portion EP is performed in order in units of the plurality of second metal portions 212 corresponding to the slit group SLG described above, similarly to the bending of the specific portion SP described above. The bending of the tip portion EP may be performed in units of individual tip portions EP, or may be performed at once (in one step) for the tip portions EP arranged so as to be aligned in the same row. It may be executed for all the tip portions EP at a time (in one step).

  When the bending of the tip end portion EP (S130) is completed, as shown in FIG. 11, each second metal portion 212 is constituted by a bent specific portion SP and is a substantially flat fourth shape orthogonal to the Z-axis direction. The second metal portion 214 and the third metal portion 213 having a substantially flat plate shape, which is a portion other than the fourth metal portion 214 in the second metal portion 212. In other words, the metal member 210 has a first metal portion 211, a third metal portion 213, and a fourth metal portion 214 (that is, the second metal portion 212). Through the above-described processing on the metal member 210 before processing, the metal member 210 (see FIG. 5) constituting the air electrode side current collecting member 200 described above is manufactured.

  Next, the coating layer 220 is formed on the metal member 210 (S140). The coating layer 220 is formed by, for example, applying by a known method such as spray coating, ink jet printing, spin coating, dip coating, plating, sputtering, thermal spraying, and then performing heat treatment as necessary. . The manufacture of the air electrode side current collecting member 200 is completed through the above steps.

A-3-2. Detailed configuration of air electrode side current collecting member 200:
12 and 13 are explanatory views showing a detailed configuration of the air electrode side current collecting member 200 in the present embodiment. FIG. 12 is an enlarged view of the XY cross-sectional configuration of the portion X1 in FIG. FIG. 13 shows a YZ cross-sectional configuration of the air electrode side current collecting member 200 at the position of XIII-XIII in FIG. Hereinafter, a detailed configuration of the air electrode side current collecting member 200 will be described mainly with reference to FIGS. 5, 12, and 13.

  As shown in FIGS. 5, 12, and 13, the air electrode side current collecting member 200 includes a first conductive portion 231 and a second conductive portion 232. The second conductive portion 232 includes a third conductive portion 233 and a fourth conductive portion 234. The first conductive portion 231 is a portion configured by a first metal portion 211 (see FIG. 11 and the like) in the metal member 210 and a coating layer 220 that covers the surface of the first metal portion 211. . The third conductive portion 233 includes a third metal portion 213 (see FIG. 11 and the like) in the metal member 210 and a coating layer 220 that covers the surface of the third metal portion 213. It is. The fourth conductive portion 234 includes a fourth metal portion 214 (see FIG. 11 and the like) in the metal member 210 and a coating layer 220 that covers the surface of the fourth metal portion 214. It is.

  In the present embodiment, the first conductive portion 231 of the air electrode side current collecting member 200 is in contact with the interconnector 150 (or the end plate 104), and each fourth conductive portion 234 is a single cell 110. In contact with the air electrode 114. Further, the third conductive portion 233 connects the first conductive portion 231 and each fourth conductive portion 234. Since the air electrode side current collecting member 200 has such a configuration, as described above, the air electrode 114 of the single cell 110 and the interconnector 150 (or the end plate 104) are electrically connected.

  Note that, as shown in the partial enlarged view of FIG. 5, between the first conductive portion 231 and the air electrode 114 of the air electrode side current collecting member 200 and between the fourth metal portion 214 and the interconnector 150 (or A spacer 139 made of, for example, mica is disposed between the end plate 104) and the end plate 104). Due to the presence of these spacers 139, the air electrode side current collecting member 200 follows the deformation of the power generation unit 102 due to the temperature cycle and the reaction gas pressure fluctuation, and the air electrode 114 and the interconnector 150 through the air electrode side current collecting member 200. Good electrical connection with (or end plate 104) is maintained.

  The first conductive portion 231 of the air electrode side current collecting member 200 has a substantially flat plate shape orthogonal to the Z-axis direction. Here, the substantially flat plate shape orthogonal to the Z-axis direction is not limited to a strict flat plate shape orthogonal to the Z-axis direction, and includes a portion having an inclination of less than 5 degrees with respect to a virtual plane orthogonal to the Z-axis direction. Includes shape. For example, a portion (Y1 portion in FIGS. 12 and 13) sandwiched between a second hole portion HP2 and a third hole portion HP3, which will be described later, in the first conductive portion 231 is assumed to be orthogonal to the Z-axis direction. It may have an inclination of less than 5 degrees with respect to the plane, and the other portion of the first conductive portion 231 may be parallel to a virtual plane orthogonal to the Z-axis direction.

  Further, the first conductive portion 231 of the air electrode side current collecting member 200 is formed with a plurality of through holes HOc. The through hole HOc formed in the first conductive portion 231 is a hole corresponding to the metal member through hole HOm (see FIG. 11) formed in the metal member 210. That is, in the air electrode side current collecting member 200 manufactured by covering the surface of the metal member 210 on which the metal member through hole HOm is formed with the coating layer 220, the air electrode side current collection member 200 is formed at a position corresponding to the metal member through hole HOm. The hole is a through hole HOc.

  In addition, the second conductive portion 232 of the air electrode side current collecting member 200 has an inner periphery (more specifically, FIG. 12 and FIG. 12) that forms the through hole HOc when viewed in the Z-axis direction. A plate-like portion (that is, the third conductive portion 233) extending from the edge of the Y1 portion in FIG. 13 in a direction intersecting the surface of the first conductive portion 231 (surface substantially parallel to the Z axis). Is included. The angle formed between the surface of the first conductive portion 231 and the surface of the third conductive portion 233 is an angle θ1 of bending of the specific portion SP when the air electrode side current collecting member 200 is manufactured (see FIG. 10). The second conductive portion 232 further includes a substantially flat plate-shaped portion (fourth conductive portion 234) orthogonal to the Z-axis direction on the tip side opposite to the boundary line BL. The angle formed between the surface of the third conductive portion 233 and the surface of the fourth conductive portion 234 is the angle θ2 of bending of the tip portion EP when the air electrode side current collecting member 200 is manufactured (FIG. 11). ).

  As shown in FIG. 12, the through hole HOc formed in the first conductive portion 231 of the air electrode side current collecting member 200 includes a first hole portion HP1, a second hole portion HP2, and a third hole portion HP1. And a hole portion HP3. The first hole portion HP1 is a direction perpendicular to the boundary line BL between the first conductive portion 231 and the second conductive portion 232 in the Z-axis direction view (the Y-axis direction, and in the claims) (Corresponding to the second direction) facing the entire virtual line segment VS. Here, the virtual line segment VS has two intersection points P1 of a straight line passing through the boundary line BL (that is, the first virtual straight line VL1) and an inner periphery forming the through hole HOc of the first conductive portion 231. , P2 are virtual line segments connecting the two. Note that “the first hole portion HP1 faces the entire virtual line segment VS” here refers only to the first conductive portion 231 (that is, the second conductive portion 232). The relationship between the first hole portion HP1 and the virtual line segment VS as viewed in the Z-axis direction is defined.

  The second hole part HP2 is opposite to the first hole part HP1 with respect to the virtual line segment VS in the direction orthogonal to the boundary line BL (Y-axis direction) when viewed in the Z-axis direction (Y-axis). One side (X-axis negative direction) of the boundary line BL in a direction (X-axis direction and corresponding to the third direction in the claims) that is located on the positive direction side and parallel to the virtual line segment VS The first hole portion HP1. The third hole part HP3 is opposite to the first hole part HP1 with respect to the virtual line segment VS in the direction (Y-axis direction) orthogonal to the boundary line BL when viewed in the Z-axis direction (Y-axis). It is located on the positive side) and continues to the first hole part HP1 on the other side (X-axis positive direction side) of the boundary line BL in the direction parallel to the virtual line segment VS (X-axis direction). .

  In the present embodiment, as shown in FIG. 12, the width of the first conductive portion 231 and the width of the second conductive portion 232 on the virtual line segment VS are equal to each other. That is, there is no step at the position of the boundary line BL between the first conductive portion 231 and the second conductive portion 232.

Further, FIG. 14 shows a posture in which the second conductive portion 232 of the air electrode side current collecting member 200 is substantially parallel to the first conductive portion 231 with respect to the boundary line BL (first virtual straight line VL1). As shown, a virtual state rotated in the direction of arrow AR1 in FIG. 13 is shown. In the present embodiment, since there is an inclination of the angle θ2 between the third conductive portion 233 and the fourth conductive portion 234, the virtual state is based on the second virtual straight line VL2. The fourth conductive portion 234 is rotated in the direction of arrow AR2 in FIG. 13 so as to be in a posture substantially parallel to the third conductive portion 233, and the first conductive portion 231 and the third conductive portion 233 are rotated. And the fourth conductive portion 234 are in a substantially parallel posture. In other words, in the air electrode side current collecting member 200 in the virtual state, the coating layer 220 is formed on the metal member 210 (see FIG. 9) in a state before the specific portion SP is bent and raised (S120 in FIG. 8). This corresponds to the configuration. In this virtual state, the air electrode side current collecting member 200 satisfies the following expressions (2) and (3). In the present embodiment, the shapes of the second conductive portion 232 and the through hole HOc are bilaterally symmetric with respect to the perpendicular bisector of the boundary line BL.
ΔWb / 2 <Wbm / 2 (2)
Σtb <D (3)
However,
・ Wbm:
In the virtual state, the metal member 210 (the second member) constituting the second conductive portion 232 at the second position separated from the boundary line BL by a distance L2 in the direction orthogonal to the boundary line BL (Y-axis direction). Width of metal portion 212) (hereinafter referred to as “width at position of distance L2”)
ΔWb:
In the virtual state, the width (the width at the position of the distance L2) Wbm is subtracted from the opening width Wbo (where Wbo> Wbm) of the metal member 210 constituting the first hole portion HP1 at the second position. Difference (Wbo-Wbm)
・ D:
In the virtual state, on the outer periphery of the metal member 210 (second metal portion 212) constituting the second conductive portion 232 in the direction parallel to the virtual line segment VS (X-axis direction) at the second position. The shortest distance from the point to the inner circumference of the first conductive portion 231 forming the through hole HOc: Σtb:
Sum of thicknesses of coating layer 220 at both ends of the shortest distance

  As shown in FIG. 14, in the above formula (2), “ΔWb / 2” is the edge of the first metal portion 211 in the virtual state (through the metal member in the first metal portion 211). This represents the distance between the inner periphery that forms the hole HOm and the edge of the second metal portion 212 (the outer periphery of the second metal portion 212). This “ΔWb / 2” is smaller than one half (Wbm / 2) of the width of the second metal portion 212 (the width at the position of the distance L2) Wbm (Wbm / 2) of the second metal portion 212 at this position. This means that the width (width at the position of the distance L2) Wbm is relatively large. Further, as shown in FIG. 14, in the present embodiment, “D” in the above equation (3) is equal to “ΔWb / 2”. That this “D (= ΔWb / 2)” is larger than the total thickness Σtb of the coating layer 220, the coating layer on both surfaces of the first metal portion 211 and the second metal portion 212 at this position. This means that 220 can be formed uniformly.

Moreover, since the air electrode side current collecting member 200 of the present embodiment is configured to satisfy the expressions (2) and (3) in the virtual state, as a result, the following expression (1) is satisfied. (See FIG. 12).
2 × ta <ΔWa / 2 <Wam / 2 (1)
However,
・ Wam:
A first distance separated from the boundary line BL by a distance L1 along the surface of the second conductive portion 232 in a direction perpendicular to the boundary line BL (a direction inclined by an angle θ1 with respect to the XY plane (see FIG. 5)). The width of the metal member 210 (second metal portion 212) constituting the second conductive portion 232 at the position (hereinafter referred to as “the width Wam at the position of the distance L1”).
ΔWa:
The opening width of the metal member 210 (first metal portion 211) constituting the first conductive portion 231 at a position separated from the boundary line BL in the direction orthogonal to the boundary line BL (Y-axis direction) by the distance L1. The difference (Wao-Wam) obtained by subtracting the width (width at the position of the distance L1) Wam from Wao.
・ Ta:
The thickness of the covering layer 220 at the first position

  As shown in FIG. 12, in the above formula (1), “ΔWa / 2” forms the edge of the first metal portion 211 as viewed in the Z-axis direction (the metal member through hole HOm in the first metal portion 211). The distance between the inner periphery) and the edge of the second metal portion 212 (the outer periphery of the second metal portion 212). The fact that this “ΔWa / 2” is larger than twice the thickness ta of the coating layer 220 (2 × ta) means that the coating layer is formed on the surface of the first metal portion 211 and the second metal portion 212 at this position. Even if 220 is formed, it means that interference between members does not occur. Further, the fact that this “ΔWa / 2” is smaller than half the width (the width at the position of the distance L1) Wam of the second metal portion 212 (Wam / 2) means that the second metal portion at this position. This means that the width 212 (width at the position of the distance L1) Wam is relatively large.

  In the present embodiment, since the air electrode side current collecting member 200 is manufactured by the above-described manufacturing method, the length (the size in the Y-axis direction) of the first hole portion HP1 with respect to the boundary line BL is as follows. The length of the surface of the second conductive portion 232 with respect to the boundary line BL (the size in the Y-axis direction) is longer.

A-3-3. Effects derived from the configuration of the air electrode side current collecting member 200 of the present embodiment:
As described above, the air electrode side current collecting member 200 of the present embodiment includes the first conductive portion 231 including the metal (first metal portion 211) and the metal (second metal portion 212). A second conductive portion 232. The first conductive portion 231 is a substantially flat plate-like portion orthogonal to the Z-axis direction. A through hole HOc is formed in the first conductive portion 231. Further, the second conductive portion 232 extends from the inner periphery of the first conductive portion 231 forming the through hole HOc in the Z-axis direction view in a direction intersecting the surface of the first conductive portion 231. A plate-like portion (third conductive portion 233) is included. The through hole HOc formed in the first conductive portion 231 has a first hole portion HP1, a second hole portion HP2, and a third hole portion HP3. The first hole portion HP1 passes through the boundary line BL in a direction (Y-axis direction) orthogonal to the boundary line BL between the first conductive portion 231 and the second conductive portion 232 when viewed in the Z-axis direction. It faces the entire virtual line segment VS connecting the two intersections P1 and P2 between the straight line (first virtual straight line VL1) and the inner periphery of the first conductive portion 231. The second hole part HP2 is located on the opposite side (Y-axis positive direction side) to the first hole part HP1 with respect to the virtual line segment VS in the direction (Y-axis direction) orthogonal to the boundary line BL, In addition, it is continuous with the first hole part HP1 on one side (X-axis negative direction side) of the boundary line BL in the direction parallel to the virtual line segment VS (X-axis direction). The third hole portion HP3 is located on the opposite side (Y-axis positive direction side) to the first hole portion HP1 with respect to the virtual line segment VS in the direction orthogonal to the boundary line BL (Y-axis direction). In addition, it is continuous with the first hole part HP1 on the other side (X-axis positive direction side) of the boundary line BL in the direction (X-axis direction) parallel to the virtual line segment VS. Since the air electrode side current collecting member 200 of the present embodiment has such a configuration, as described below, it is possible to suppress the occurrence of cracks in the air electrode side current collecting member 200 due to stress concentration. .

  FIG. 15 is an explanatory diagram showing the configuration of the air electrode side current collecting member 200X in the comparative example. The air electrode side current collecting member 200X of the comparative example shown in FIG. 15 differs from the air electrode side current collecting member 200 of the present embodiment shown in FIG. 12 in the shape of the first conductive portion 231. Specifically, in the air electrode side current collecting member 200X of the comparative example, the bending raising position in the bending raising process (S120 in FIG. 8) of the metal member 210 is not the position of the first virtual straight line VL1, but the comparison. It is the position of the virtual straight line VL0 (see FIG. 9). Note that the comparison virtual straight line VL0 is a straight line that does not virtually divide the slit SL into a plurality of portions, unlike the first virtual straight line VL1. That is, in the air electrode side current collecting member 200X of the comparative example, the through hole HOc passes through the boundary line BL between the first conductive portion 231 and the second conductive portion 232 (comparison virtual straight line VL0) and the first The virtual line segment VS connecting the two intersections P1 and P2 with the inner periphery of one conductive portion 231 is not divided into a plurality of portions. As a result, in the air electrode side current collecting member 200X of the comparative example, the second direction (Y-axis direction (however, the first axis direction orthogonal to the boundary line BL) between the first conductive portion 231 and the second conductive portion 232) 2), a portion constituting the bent portion (hereinafter referred to as “hole”) in the portion facing the end portion of the through hole HOc in the direction opposite to the tip end side of the conductive portion 232 of Y 2). End facing portion Y <b> 2 ”) coincides with the position of the boundary line BL between the first conductive portion 231 and the second conductive portion 232. Therefore, the hole end facing portion Y <b> 2 in the air electrode side current collecting member 200 </ b> X of the comparative example is bent at the position of the boundary line BL between the first conductive portion 231 and the second conductive portion 232. Since the air electrode side current collecting member 200X of the comparative example has such a configuration, for example, the air electrode side current collecting member 200X is generated when the air electrode side current collecting member 200X repeats thermal expansion and thermal contraction during operation of the fuel cell stack 100 or the like. Stress concentrates on a specific location (for example, the hole end facing portion Y2) of the air electrode side current collecting member 200X. As a result, in the air electrode side current collecting member 200X of the comparative example, there is a possibility that cracks may occur at specific locations in the air electrode side current collecting member 200X.

  In contrast, in the air electrode side current collecting member 200 of the present embodiment, as shown in FIG. 12, the through hole HOc formed in the first conductive portion 231 has the first conductive portion 231 and the second conductive portion 231. By a virtual line segment VS connecting between two intersections P1 and P2 of the straight line (first virtual straight line VL1) passing through the boundary line BL with the conductive part 232 and the inner periphery of the first conductive part 231. The first hole part HP1, the second hole part HP2, and the third hole part HP3 are divided into the above-described parts. Therefore, in the air electrode side current collecting member 200 of the present embodiment, the hole end facing portion Y2 (that is, the second orthogonal to the boundary line BL between the first conductive portion 231 and the second conductive portion 232). The first conductive layer is a portion that constitutes a bent portion among the portions facing the end of the through hole HOc in the direction (however, the direction opposite to the tip side of the second conductive portion 232). Does not coincide with the position of the boundary line BL between the conductive portion 231 and the second conductive portion 232. Therefore, the hole end facing portion Y2 in the air electrode side current collecting member 200 of the present embodiment is not bent like the position of the boundary line BL between the first conductive portion 231 and the second conductive portion 232. It becomes a substantially flat plate shape. Since the air electrode side current collecting member 200 of the present embodiment has such a configuration, for example, when the air electrode side current collecting member 200 repeats thermal expansion / contraction during operation of the fuel cell stack 100 or the like. It can suppress that the stress which arises concentrates on the specific location (for example, hole edge part opposing part Y2) of the air electrode side current collection member 200. FIG. Therefore, according to the air electrode side current collecting member 200 of the present embodiment, it is possible to suppress the occurrence of cracks at specific locations of the air electrode side current collecting member 200.

  Further, in the air electrode side current collecting member 200 of the present embodiment, the width of the first conductive portion 231 and the width of the second conductive portion 232 on the virtual line segment VS are equal to each other. That is, there is no step at the position of the boundary line BL between the first conductive portion 231 and the second conductive portion 232. Therefore, according to the air electrode side current collecting member 200 of the present embodiment, it is possible to effectively suppress the stress from being concentrated on a specific location (for example, the hole end facing portion Y2) of the air electrode side current collecting member 200. Therefore, it is possible to effectively suppress the occurrence of cracks at specific locations of the air electrode side current collecting member 200.

  Further, in the air electrode side current collecting member 200 of the present embodiment, the first conductive portion 231 includes a plate-like metal member 210 (first metal portion 211) containing Cr and a first metal portion 211. And a coating layer 220 that suppresses the diffusion of Cr from the first metal portion 211. Similarly, the second conductive portion 232 is formed on the surface of the plate-shaped metal member 210 (second metal portion 212) containing Cr and the second metal portion 212, and the second metal portion 212. And a coating layer 220 that suppresses the diffusion of Cr. That is, in the air electrode side current collecting member 200 of the present embodiment, the through hole HOc is divided into the first hole part HP1, the second hole part HP2, and the third hole part HP3 by the virtual line segment VS. Therefore, in the air electrode side current collecting member 200 of the present embodiment, cracks are prevented from occurring in the coating layer 220 at a specific location of the metal member 210 (for example, a portion constituting the hole end facing portion Y2). be able to. Therefore, according to the air electrode side current collecting member 200 of the present embodiment, the diffusion of Cr from the metal member 210 can be effectively suppressed by the coating layer 220.

Further, as described above, the air electrode side current collecting member 200 of the present embodiment satisfies the following expression (1).
2 × ta <ΔWa / 2 <Wam / 2 (1)
Therefore, in the air electrode side current collecting member 200 of this embodiment, the width (width at the position of the distance L1) Wam of the second metal portion 212 can be made relatively large, and the first metal portion 211 and Even if the coating layer 220 is formed on the surface of the second metal portion 212, the occurrence of interference between members (parts) can be suppressed. Therefore, according to the air electrode side current collecting member 200 of the present embodiment, the current collecting member 200 by the air electrode side current collecting member 200 becomes smaller as the width (width at the position of the distance L1) Wam of the second metal portion 212 becomes smaller. While avoiding the deterioration of the electric function, it is possible to suppress the occurrence of peeling of the coating layer 220 or damage to the member due to interference between members (parts).

Further, as described above, the air electrode side current collecting member 200 of the present embodiment satisfies the following expressions (2) and (3).
ΔWb / 2 <Wbm / 2 (2)
Σtb <D (3)
Therefore, in the air electrode side current collecting member 200 of the present embodiment, when the metal member 210 including the first metal portion 211 and the second metal portion 212 is manufactured by bending (S120 in FIG. 8), The width (width at the position of the distance L2) Wbm of the second metal portion 212 can be made relatively large, and the covering layer 220 is provided on both surfaces of the first metal portion 211 and the second metal portion 212. It can be formed uniformly. Therefore, according to the air electrode side current collecting member 200 of the present embodiment, the air electrode side current collecting member 200 collects as the width (width at the position of the distance L2) Wbm of the second metal portion 212 decreases. The diffusion of Cr from the metal member 210 can be effectively suppressed by the coating layer 220 while avoiding the deterioration of the electric function.

  Further, in the air electrode side current collecting member 200 of the present embodiment, the coating layer 220 is configured to include at least one of a spinel oxide and a perovskite oxide. Therefore, according to the air electrode side current collecting member 200 of the present embodiment, the diffusion of Cr from the metal member 210 can be effectively suppressed by the coating layer 220.

A-4. Detailed description of the fuel electrode side current collecting member 300:
FIG. 16 is an explanatory diagram showing a detailed configuration of the fuel electrode side current collecting member 300 in the present embodiment. FIG. 16 is an enlarged view of the XY cross-sectional configuration of the portion X2 in FIG. Hereinafter, the detailed configuration of the fuel electrode side current collecting member 300 will be described mainly with reference to FIGS. 4, 7 and 16. Since the configuration of the fuel electrode side current collecting member 300 is similar to the configuration of the air electrode side current collecting member 200 described above, the air electrode side current collecting member in the configuration of the fuel electrode side current collecting member 300 will be described below. The description will focus on the differences from the configuration of the electric member 200.

  As shown in FIGS. 4, 7, and 16, the fuel electrode side current collecting member 300 includes a first conductive portion 301 and a second conductive portion 302. The second conductive portion 302 includes a third conductive portion 303 and a fourth conductive portion 304. In the present embodiment, the fuel electrode side current collecting member 300 is formed of a conductive material such as nickel or a nickel alloy, for example. The fuel electrode side current collecting member 300 is not covered with a coating layer like the air electrode side current collecting member 200.

  In the present embodiment, the first conductive portion 301 of the fuel electrode side current collecting member 300 is in contact with the interconnector 150 (or the end plate 106), and each fourth conductive portion 304 is a single cell 110. In contact with the fuel electrode 116. Further, the third conductive portion 303 connects the first conductive portion 301 and each fourth conductive portion 304. Since the fuel electrode side current collecting member 300 has such a configuration, as described above, the fuel electrode 116 of the single cell 110 and the interconnector 150 (or the end plate 106) are electrically connected.

  A spacer 149 made of, for example, mica is disposed between the first conductive portion 301 and the fourth conductive portion 304 of the fuel electrode side current collecting member 300. Due to the presence of the spacer 149, the fuel electrode side current collecting member 300 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 of the single cell 110 via the fuel electrode side current collecting member 300 and the Good electrical connection with the connector 150 (or end plate 106) is maintained.

  The first conductive portion 301 of the fuel electrode side current collecting member 300 has a substantially flat plate shape orthogonal to the Z-axis direction. Here, the substantially flat plate shape orthogonal to the Z-axis direction is not limited to a strict flat plate shape orthogonal to the Z-axis direction, and includes a portion having an inclination of less than 5 degrees with respect to a virtual plane orthogonal to the Z-axis direction. Includes shape. Further, a through hole HOa is formed in the first conductive portion 301 of the fuel electrode side current collecting member 300.

  Further, the second conductive portion 302 of the fuel electrode side current collecting member 300 has an inner periphery (more specifically, FIG. 16) of the first conductive portion 301 forming the through hole HOa when viewed in the Z-axis direction. Including a plate-like portion (that is, the third conductive portion 303) extending from the edge of the Y3 portion in a direction intersecting the surface of the first conductive portion 301 (the surface substantially parallel to the Z axis). Yes. In the present embodiment, the angle formed by the surface of the first conductive portion 301 and the surface of the third conductive portion 303 is approximately 90 degrees. The second conductive portion 302 further includes a substantially flat plate-shaped portion (fourth conductive portion 304) orthogonal to the Z-axis direction on the tip side opposite to the boundary line BL. In the present embodiment, the angle formed by the surface of the third conductive portion 303 and the surface of the fourth conductive portion 304 is approximately 90 degrees.

  The through hole HOa formed in the first conductive portion 301 of the fuel electrode side current collecting member 300 has a first hole portion HP1, a second hole portion HP2, and a third hole portion HP3. ing. The first hole portion HP1 is a direction perpendicular to the boundary line BL between the first conductive portion 301 and the second conductive portion 302 (in the Y-axis direction, as viewed in the Z-axis direction). (Corresponding to the second direction) facing the entire virtual line segment VS. Here, the imaginary line segment VS is 2 of a straight line passing through the boundary line BL (that is, the third imaginary straight line VL3 in FIG. 16) and the inner circumference forming the through hole HOa of the first conductive portion 301. This is a virtual line segment connecting two intersection points P3 and P4.

  The second hole part HP2 is opposite to the first hole part HP1 with respect to the virtual line segment VS in the direction orthogonal to the boundary line BL (Y-axis direction) when viewed in the Z-axis direction (Y-axis). One side (X-axis negative direction) of the boundary line BL in a direction (X-axis direction and corresponding to the third direction in the claims) located on the negative direction side and parallel to the virtual line segment VS The first hole portion HP1. The third hole part HP3 is opposite to the first hole part HP1 with respect to the virtual line segment VS in the direction (Y-axis direction) orthogonal to the boundary line BL when viewed in the Z-axis direction (Y-axis). Located on the negative direction side and is continuous with the first hole part HP1 on the other side (X-axis positive direction side) of the boundary line BL in the direction parallel to the virtual line segment VS (X-axis direction). .

  In the present embodiment, the width of the first conductive portion 301 and the width of the second conductive portion 302 on the virtual line segment VS are equal to each other. That is, there is no step at the position of the boundary line BL between the first conductive portion 301 and the second conductive portion 302.

  The fuel electrode side current collecting member 300 having the above-described configuration can be manufactured by a method similar to the method for manufacturing the air electrode side current collecting member 200 described above with reference to FIG. However, the direction and angle of bending and bending when the fuel electrode side current collecting member 300 is manufactured are different from those when the air electrode side current collecting member 200 is manufactured. In addition, since the fuel electrode side current collecting member 300 does not have the covering layer 220, the process of forming the covering layer 220 executed when the air electrode side current collecting member 200 is manufactured is the fuel electrode side current collecting member 300. It is not performed during the manufacture of

  As described above, the fuel electrode side current collecting member 300 of the present embodiment includes the first conductive portion 301 made of metal and the second conductive portion 302 made of metal. The first conductive part 301 is a substantially flat part perpendicular to the Z-axis direction. A through hole HOa is formed in the first conductive portion 301. The second conductive portion 302 extends from the inner periphery of the first conductive portion 301 forming the through hole HOa in the Z-axis direction view in a direction intersecting the surface of the first conductive portion 301. A plate-like portion (third conductive portion 303) is included. The through hole HOa formed in the first conductive portion 301 includes a first hole portion HP1, a second hole portion HP2, and a third hole portion HP3. The first hole portion HP1 passes through the boundary line BL in a direction (Y-axis direction) orthogonal to the boundary line BL between the first conductive portion 301 and the second conductive portion 302 when viewed in the Z-axis direction. It faces the entire virtual line segment VS connecting the two intersections P3 and P4 between the straight line (third virtual straight line VL3) and the inner periphery of the first conductive portion 301. The second hole part HP2 is located on the opposite side to the first hole part HP1 with respect to the virtual line segment VS in the direction orthogonal to the boundary line BL (Y-axis direction), and is in the virtual line segment VS. On one side (X-axis negative direction side) of the boundary line BL in the parallel direction (X-axis direction), it is continuous with the first hole part HP1. The third hole portion HP3 is located on the opposite side of the first hole portion HP1 with respect to the virtual line segment VS in the direction orthogonal to the boundary line BL (Y-axis direction), and the virtual line segment On the other side (X-axis positive direction side) of the boundary line BL in the direction parallel to VS (X-axis direction), it is continuous with the first hole part HP1. Therefore, according to the fuel electrode side current collecting member 300 of the present embodiment, in the same manner as described above for the air electrode side current collecting member 200, a specific portion (for example, the first conductive member) of the fuel electrode side current collecting member 300 is used. Of the portion facing the end portion of the through hole HOa in the second direction (Y-axis direction) orthogonal to the boundary line BL between the conductive portion 301 and the second conductive portion 302 is formed. It is possible to suppress the stress from being concentrated on the location (hole end facing portion Y4 shown in FIG. 16), and to suppress the occurrence of cracks at a specific location on the fuel electrode side current collecting member 300. .

  Further, in the fuel electrode side current collecting member 300 of the present embodiment, the width of the first conductive portion 301 and the width of the second conductive portion 302 on the virtual line segment VS are equal to each other. That is, there is no step at the position of the boundary line BL between the first conductive portion 301 and the second conductive portion 302. Therefore, according to the fuel electrode side current collecting member 300 of the present embodiment, it is possible to effectively suppress the concentration of stress on a specific portion (for example, the hole end facing portion Y4) of the fuel electrode side current collecting member 300. Therefore, it is possible to effectively suppress the occurrence of cracks at specific locations of the fuel electrode side current collecting member 300.

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

  The configuration of the single cell 110, the air electrode side current collecting member 200, the fuel electrode side current collecting member 300, the power generation unit 102, or the fuel cell stack 100 in the above embodiment is merely an example, and can be variously modified. For example, in the air electrode side current collecting member 200 of the above embodiment, the width of the first conductive portion 231 and the width of the second conductive portion 232 on the virtual line segment VS are assumed to be equal to each other (FIG. 12). 17), the width of the first conductive portion 231 on the virtual line segment VS is larger than the width of the second conductive portion 232 as in the air electrode side current collecting member 200 of the modification shown in FIG. Also good. Also in the air electrode side current collecting member 200 of the modified example shown in FIG. 17, the through-hole HOc formed in the first conductive portion 231 is similar to the air electrode side current collecting member 200 of the above embodiment. Between two intersections P1 and P2 of a straight line (first imaginary straight line VL1) passing through the boundary line BL between the conductive portion 231 and the second conductive portion 232 and the inner periphery of the first conductive portion 231 Are divided into a first hole part HP1, a second hole part HP2 and a third hole part HP3. Therefore, in the air electrode side current collecting member 200 of the modified example shown in FIG. 17, the hole end facing portion Y2 (that is, orthogonal to the boundary line BL between the first conductive portion 231 and the second conductive portion 232). The second direction (however, the portion constituting the bent portion among the portions facing the end of the through hole HOc in the direction opposite to the tip side of the second conductive portion 232) is the first It does not coincide with the position of the boundary line BL between the first conductive portion 231 and the second conductive portion 232. That is, the hole end facing portion Y2 in the air electrode side current collecting member 200 of the comparative example shown in FIG. 17 is like the position of the boundary line BL between the first conductive portion 231 and the second conductive portion 232. The third conductive portion 233 extending in a direction intersecting the surface substantially parallel to the first conductive portion 231 is not continuous (for example, is not bent), and the first conductive portion 231 It becomes a substantially flat plate shape that is substantially parallel. Therefore, also in the air electrode side current collecting member 200 of the modified example shown in FIG. 17, for example, the stress generated when the air electrode side current collecting member 200 repeats thermal expansion / contraction when the fuel cell stack 100 is operated. However, it can suppress that it concentrates on the specific location (for example, hole edge part opposing part Y2) of the air electrode side current collection member 200. FIG. Therefore, even in the air electrode side current collecting member 200 of the modified example shown in FIG. 17, it is possible to suppress the occurrence of cracks at specific locations of the air electrode side current collecting member 200.

  Moreover, in the said embodiment, the virtual state which rotated the 2nd electroconductive part 232 of the air electrode side current collection member 200 so that it might become the attitude | position substantially parallel to the 1st electroconductive part 231 on the basis of the boundary line BL. (Refer to FIG. 14) Although the shape of the second conductive portion 232 when viewed in the Z-axis direction is substantially rectangular, like the air electrode side current collecting member 200 of the modification shown in FIGS. 18 and 19, In the virtual state (the state shown in FIG. 19), the shape of the second conductive portion 232 when viewed in the Z-axis direction may be another shape (for example, a substantially trapezoidal shape).

In addition, in the air electrode side current collecting member 200 of the modification shown in FIG. 18 and FIG. 19, in the virtual state (FIG. 19), the following formula (2) and (3) is satisfied.
ΔWb / 2 <Wbm / 2 (2)
Σtb <D (3)

Moreover, in the air electrode side current collecting member 200 of the modified example shown in FIGS. 18 and 19, as in the air electrode side current collecting member 200 of the above embodiment, in the normal state (FIG. 18) that is not a virtual state, the following Expression (1) is satisfied.
2 × ta <ΔWa / 2 <Wam / 2 (1)

  Moreover, in the said embodiment, the 2nd electroconductive part 232 of the air electrode side current collection member 200 is extended | stretched in the direction which cross | intersects the surface of the 3rd electroconductive part 233 (namely, the 1st electroconductive part 231). Plate-like portion) and a fourth conductive portion 234 (that is, a substantially flat plate-like portion orthogonal to the Z-axis direction). The second conductive portion 232 is a fourth conductive portion. The portion 234 may not be provided, and only the third conductive portion 233 may be configured. In such a configuration, the third conductive portion 233 is connected to the air electrode 114.

  Similarly, in the above embodiment, the second conductive portion 302 of the fuel electrode side current collecting member 300 extends in a direction intersecting the surface of the third conductive portion 303 (that is, the first conductive portion 301). Plate-like portion) and a fourth conductive portion 304 (that is, a substantially flat plate-like portion perpendicular to the Z-axis direction). The second conductive portion 302 is a fourth conductive portion. It may be configured only by the third conductive portion 303 without having the conductive portion 304. In such a configuration, the third conductive portion 303 is connected to the fuel electrode 116.

  In the above embodiment, the first conductive portion 231 of the air electrode side current collecting member 200 is in contact with the interconnector 150 (or the end plate 104), and the fourth conductive portion 232 is configured as the fourth conductive portion 232. In contrast, the second conductive portion 232 is in contact with the interconnector 150 (or the end plate 104), and the first conductive portion 231 is in contact with the air electrode 114. It may be in contact with the air electrode 114.

  Similarly, in the above-described embodiment, the first conductive portion 301 of the fuel electrode side current collecting member 300 is in contact with the interconnector 150 (or the end plate 106), and the second conductive portion 302 is formed. The fourth conductive portion 304 is in contact with the fuel electrode 116, while the second conductive portion 302 is in contact with the interconnector 150 (or the end plate 106), and the first conductive portion 301 is in contact with the anode 116. May be in contact with the fuel electrode 116.

  In the above embodiment, the shape of the air electrode side current collecting member 200 may be the same as the shape of the fuel electrode side current collecting member 300. That is, the shape of the air electrode side current collecting member 200 in the above embodiment includes the bending direction (rotation direction) of the third conductive portion 233 with respect to the first conductive portion 231 and the third conductive portion. The fourth conductive portion 234 with respect to 233 has a shape opposite to the bending direction (rotational direction), but the bending direction of both is the same direction as in the fuel electrode side current collecting member 300. It may be a shape.

  Similarly, in the above embodiment, the shape of the fuel electrode side current collecting member 300 may be the same shape as the shape of the air electrode side current collecting member 200. That is, the shape of the fuel electrode side current collecting member 300 in the above embodiment includes the bending direction (rotation direction) of the third conductive portion 303 with respect to the first conductive portion 301 and the third conductive portion. The fourth conductive portion 304 has a shape in which the bending direction (rotational direction) of the fourth conductive portion 304 is the same direction as that of 303, but the bending direction of both is opposite to that of the air electrode side current collecting member 200. It may be a shape.

  Moreover, in the said embodiment, although the air electrode side current collection member 200 is comprised from the metal member 210 and the coating layer 220, the air electrode side current collection member 200 does not have the coating layer 220, but is a metal member. It may be composed only of 210. Moreover, in the said embodiment, although the fuel electrode side current collection member 300 does not have a coating layer, the fuel electrode side current collection member 300 is a metal member formed by the metal containing Cr (for example, ferrite type stainless steel etc.). And a coating layer that is formed of a conductive material (for example, Ni) and covers the metal member.

  Further, in the above embodiment, the air electrode side current collecting member 200 is in contact with the air electrode 114 without passing through the bonding layer, but the air electrode side current collecting member 200 is in contact with the air electrode 114 through the bonding layer. It is good. Further, in the above embodiment, the fuel electrode side current collecting member 300 is in contact with the fuel electrode 116 without passing through the bonding layer. However, even if the fuel electrode side current collecting member 300 is in contact with the fuel electrode 116 through the bonding layer. Good.

  Moreover, in the said embodiment, between the 1st electroconductive part 231 and the air electrode 114 of the air electrode side current collection member 200, and between the 4th metal part 214 and the interconnector 150 (or end plate 104). The spacer 139 is disposed between them, but one or both of the spacers 139 may not be disposed.

  Further, in the above-described embodiment, among the corner portions forming the second hole portion HP2, the corner portion closest to the third hole portion HP3 in the X-axis direction (third direction), and the third hole portion HP3. At least one of the corners forming the shape and the corner closest to the second hole part HP2 in the X-axis direction (third direction) may be R-shaped. As shown in FIG. 12 and the like, of the corner portions forming the second hole portion HP2, the corner portion closest to the third hole portion HP3 in the X-axis direction (third direction), and the third hole Of the corners forming the portion HP3, the corner closest to the second hole portion HP2 in the X-axis direction (third direction) is the hole end facing portion Y2 of the air electrode side current collecting member 200. For this reason, if at least one of the corners has an R shape, the concentration of stress can be extremely effectively suppressed, and the occurrence of cracks can be extremely effectively suppressed. The curvature of the R shape is preferably 0.1 mm to 1 mm or more, and preferably 0.25 mm to 0.75 mm or less.

  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. Further, it is necessary that the configuration described in the above embodiment is adopted for both the air electrode side current collecting member 200 and the fuel electrode side current collecting member 300 in all of the plurality of power generation units 102 constituting the fuel cell stack 100. The configuration described in the above embodiment is employed for at least one of the air electrode side current collecting member 200 and the fuel electrode side current collecting member 300 in at least one of the plurality of power generation units 102 constituting the fuel cell stack 100. It only has to be.

  In the above embodiment, the fuel cell stack 100 is formed with manifolds 161, 162, 171, 172 which are flow paths for supplying or discharging gas. These manifolds 161, 162, 171, 172 are formed. For at least one of the above, such a flow path may not be formed, and gas exchange between the outside of the fuel cell stack 100 and the gas chamber (the air chamber 166 or the fuel chamber 176) may be performed directly. .

  Moreover, the material which comprises each member in the said embodiment is an illustration to the last, and each member may be comprised with the other material. For example, in the above embodiment, the metal member 210 constituting the air electrode side current collecting member 200 is formed of ferritic stainless steel, but the metal member 210 may be formed of other materials. Moreover, in the said embodiment, although the coating layer 220 which comprises the air electrode side current collection member 200 is comprised so that at least one of a spinel type oxide and a perovskite type oxide may be comprised, the coating layer 220 is a spinel type. You may form with materials other than an oxide and a perovskite type oxide.

  Moreover, the manufacturing method of the fuel electrode side current collecting member 300 and the air electrode side current collecting member 200 in the above embodiment is merely an example, and various modifications can be made. For example, in manufacturing the fuel electrode side current collecting member 300 and / or the air electrode side current collecting member 200, cutting, casting, joining, etching, or the like may be performed instead of the bending process described above.

  In the above-described embodiment, the fuel cell stack 100 has a configuration in which a plurality of substantially flat power generation units 102 (single cells 110) are arranged side by side. However, the present invention can generate power in other shapes (for example, a cylindrical shape). The present invention can be similarly applied to a fuel cell stack in which a plurality of units (single cells) are arranged side by side.

  In the above embodiment, the SOFC that generates electricity using the electrochemical reaction between hydrogen contained in the fuel gas and oxygen contained in the oxidant gas is targeted. The present invention can be similarly applied to an electrolytic cell unit that is a constituent unit of a solid oxide electrolytic cell (SOEC) that generates hydrogen by using hydrogen, and an electrolytic cell stack including a plurality of electrolytic cell units. The configuration of the electrolysis cell stack is well known as described in, for example, Japanese Patent Application Laid-Open No. 2006-81813, and therefore will not be described in detail here, but is roughly the same as the fuel cell stack 100 in the above-described embodiment. It is the composition. That is, the fuel cell stack 100 in the above-described embodiment may be read as an electrolytic cell stack, the power generation unit 102 may be read as an electrolytic cell unit, and the single cell 110 may be read as an electrolytic single cell. However, when the electrolysis cell stack is operated, a voltage is applied between the two electrodes so that the air electrode 114 is positive (anode) and the fuel electrode 116 is negative (cathode). Water vapor as a source gas is supplied. As a result, an electrolysis reaction of water occurs in each electrolysis cell unit, hydrogen gas is generated in the fuel chamber 176, and hydrogen is taken out of the electrolysis cell stack through the communication hole. Also in the electrolysis cell unit and the electrolysis cell stack having such a configuration, the air electrode side current collecting member 200 and the fuel electrode can be obtained by employing the air electrode side current collecting member 200 and the fuel electrode side current collecting member 300 having the above-described configuration. It can suppress that a crack generate | occur | produces in the specific location of the side current collection member 300. FIG.

 In the above embodiment, the solid oxide fuel cell (SOFC) has been described as an example. However, the present invention is applicable to other types of fuel cells (or electrolytic cells) such as a molten carbonate fuel cell (MCFC). Applicable. In addition, the present invention is not limited to the current collecting member constituting the electrochemical reaction unit, and includes a first conductive portion that includes a metal and has a substantially flat plate shape orthogonal to the first direction, and has a through hole formed therein. , Including a plate-like portion that includes a metal and extends in a direction intersecting the surface of the first conductive portion from the inner periphery of the first conductive portion that forms the through hole in the first direction view. In general, the conductive member including the second conductive portion is applicable.

22: Bolt 24: Nut 26: Insulating sheet 27: Gas passage member 28: Body portion 29: Branch portion 100: Fuel cell stack 102: Fuel cell power generation unit 104: End plate 106: End plate 108: Communication 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 139: Spacer 140: Fuel electrode side frame 141: Hole 142: Fuel gas supply communication hole 143: Fuel gas discharge communication hole 149: Spacer 150: Interconnector 152: Cover layer 161: Oxidant gas introduction manifold 162: Oxidant gas discharge manifold 166: Air chamber 1 1: Fuel gas introduction manifold 172: Fuel gas discharge manifold 176: Fuel chamber 200: Air electrode side current collecting member 210: Metal member 211: First metal portion 212: Second metal portion 213: Third metal portion 214 : Fourth metal portion 218: oxide film layer 220: coating layer 231: first conductive portion 232: second conductive portion 233: third conductive portion 234: fourth conductive portion 300: fuel Polarity side current collecting member 301: first conductive portion 302: second conductive portion 303: third conductive portion 304: fourth conductive portion

Claims (11)

A first conductive portion including a metal and having a substantially flat plate shape perpendicular to the first direction and having a through hole; and the metal including the metal and forming the through hole in the first direction view. A conductive member comprising: a second conductive portion including a plate-like portion extending from the inner periphery of the first conductive portion in a direction intersecting the surface of the first conductive portion;
The through hole is
In the first direction view,
Two intersection points of a straight line passing through the boundary line and an inner circumference of the first conductive part in a second direction orthogonal to the boundary line between the first conductive part and the second conductive part A first hole portion facing the entire imaginary line segment connecting between the two,
In the second direction, located on the opposite side to the first hole portion with respect to the virtual line segment, and on one side of the boundary line in a third direction parallel to the virtual line segment, A second hole portion continuous with the first hole portion;
In the second direction, the first hole portion is located on the opposite side of the imaginary line segment from the first hole portion and on the other side of the boundary line in the third direction. A third hole portion continuing to
A conductive member characterized by comprising: The conductive member according to claim 1,
The conductive member, wherein a width of the first conductive portion and a width of the second conductive portion on the virtual line segment are equal to each other. In the conductive member according to claim 1 or 2,
Each of the first conductive portion and the second conductive portion is:
A plate-like metal member containing Cr;
A coating layer that is formed on the surface of the metal member and suppresses the diffusion of Cr from the metal member;
A conductive member characterized by comprising: The conductive member according to claim 3,
The electroconductive member characterized by satisfy | filling the following formula | equation (1).
2 × ta <ΔWa / 2 <Wam / 2 (1)
However,
Wam: the width ΔWa of the metal member at a first position separated from the boundary line by a distance L1 along the surface of the second conductive portion in a direction orthogonal to the boundary line: the second from the boundary line The difference (Wao-Wam) obtained by subtracting the width Wam from the opening width Wao of the metal member at a position separated by the distance L1 in the direction of
ta: thickness of the coating layer at the first position The conductive member according to claim 3,
The electroconductive member characterized by satisfy | filling the following formula | equation (2) and Formula (3).
ΔWb / 2 <Wbm / 2 (2)
Σtb <D (3)
However,
Wbm: the second direction from the boundary line in the second direction in a virtual state in which the second conductive part is rotated with respect to the boundary line so as to be substantially parallel to the first conductive part. The width ΔWb of the metal member constituting the second conductive portion at the second position separated by the distance L2 at the distance L2: the metal constituting the first hole portion at the second position in the virtual state Difference obtained by subtracting the width Wbm from the opening width Wbo of the member (Wbo-Wbm)
D: In the virtual state, the shortest distance from the point on the outer periphery of the metal member constituting the second conductive portion in the third direction at the second position to the inner periphery Σtb: the shortest distance The sum of the thicknesses of the covering layers at the positions of both ends of In the electroconductive member as described in any one of Claim 3 to Claim 5,
The conductive layer includes at least one of a spinel oxide and a perovskite oxide. In the electroconductive member as described in any one of Claim 1- Claim 6,
Of the corners forming the second hole part, the corner closest to the third hole part in the third direction, and the third of the corners forming the third hole part. At least one of the corner portion closest to the second hole portion in the direction of the shape is R-shaped, and the conductive member. In the electroconductive member as described in any one of Claim 1- Claim 7,
The conductive member is a conductive member for a solid oxide electrochemical reaction unit. An electrochemical reaction unit,
An electrochemical reaction unit cell including an electrolyte layer containing a solid oxide and an air electrode and a fuel electrode facing each other in a first direction across the electrolyte layer;
9. The device according to claim 1, wherein the electrochemical reaction unit cell is disposed on one side in the first direction and functions as a current collecting member electrically connected to the air electrode or the fuel electrode. The conductive member according to any one of the above,
An electrochemical reaction unit comprising: The electrochemical reaction unit according to claim 9,
The electrochemical reaction unit is a fuel cell power generation unit. In an electrochemical reaction cell stack comprising a plurality of electrochemical reaction units arranged side by side in the first direction,
The electrochemical reaction cell stack according to claim 9, wherein at least one of the plurality of electrochemical reaction units is the electrochemical reaction unit according to claim 9.

Images