JP6472559B2 - End current collecting member and cell stack device - Google Patents

Description

  The present invention relates to an end current collecting member and a cell stack device.

  The cell stack device includes a fuel cell and a manifold (Patent Document 1). The fuel battery cell and the manifold are disposed in the housing. The fuel cell extends upward from the manifold. The manifold supplies fuel gas to the gas flow path of the fuel battery cell. In addition, oxygen-containing gas (such as air) is supplied to the outer surface of the fuel cell. The fuel cell generates electric power using fuel gas and air.

Japanese Patent Application Laid-Open No. 2006-171064

  In order to take out the electric power generated by the fuel cell to an external circuit, it is conceivable to join an end current collecting member to the fuel cell. In this case, the end current collecting member is joined to the fuel cell using a joining material or the like. Moreover, in order to take out electric power to an external circuit, the edge part current collection member is extended from the fuel cell.

  In the cell stack device having such a configuration, when an external circuit component is attached to the end current collecting member, a tensile load acts on the end current collecting member, and the end current collecting member is peeled off from the fuel cell. There is a fear. Then, the subject of this invention is providing the edge part current collection member which is hard to peel from a fuel cell.

  The end current collecting member according to the first aspect of the present invention is configured to extract electric power from the fuel cell. The end current collecting member includes a joint portion, a connecting portion, and a drawer portion. The joint has a first end and a second end. Further, the joining portion is configured to be joined to the fuel battery cell. The connecting portion extends from the first end portion of the joint portion toward the second end portion. The drawer portion extends from the distal end portion of the connecting portion and extends in a direction away from the joint portion.

  When attaching an external circuit component or the like to the drawer, a tensile load may be applied to the drawer. Thus, even when a tensile load is applied to the drawer portion, the tensile load does not act directly on the joint portion. That is, the tensile load applied to the drawer portion is absorbed by moving the distal end portion of the connecting portion extending in the direction intersecting with the tensile load in the pulling direction, so that the load applied to the joint portion can be reduced. As a result, the end current collecting member is hardly peeled off from the fuel battery cell.

  Preferably, the base end portion of the connecting portion is bent so that the extending direction is reversed.

  Preferably, the joint portion has a longitudinal direction and a lateral direction. And the 1st end part of a junction part is one end part in a transversal direction, and the 2nd end part of a junction part is the other end part in a transversal direction. In this case, preferably, the connecting portion extends beyond the second end portion of the joint portion in the short direction.

  The first end portion of the joint portion may be one end portion in the longitudinal direction, and the second end portion of the joint portion may be the other end portion in the longitudinal direction.

  Preferably, the joint portion has a rectangular shape.

  Preferably, the longitudinal direction of the joint extends along the width direction of the fuel cell.

  Preferably, the joining portion, the connecting portion, and the drawer portion are configured by one member.

  Preferably, the joining portion, the connecting portion, and the drawer portion are configured from a single metal plate. For example, when a junction part, a connection part, and a drawer | drawing-out part are comprised from a mutually different member, the location which joins a junction part, a connection part, and a drawer | drawing-out part arises. Then, the power loss due to the generation of resistance at each junction becomes a problem. On the other hand, when a junction part, a connection part, and a drawer | drawing-out part are comprised from one metal plate, the joining location as mentioned above does not arise. For this reason, the resistance in a joining location does not generate | occur | produce and the power loss at the time of taking out an electric current from a fuel battery cell outside can be reduced more.

  Preferably, the joint portion includes a central region and first and second regions arranged so as to sandwich the central region in the width direction. And a drawer | drawing-out part is arrange | positioned at either one side of the 1st and 2nd area | region of a junction part.

  Preferably, the distal end portion of the connecting portion is disposed on one side of the first and second regions of the joint portion.

  Preferably, the connection portion extends from a first end portion of one of the first and second regions of the joint portion.

  Preferably, the connection portion extends from the first end portion of the central region of the joint portion.

  Preferably, the drawer portion has an attachment hole for attaching the lead wire.

  Preferably, the attachment hole of the drawer portion has a long hole shape that is long in the extending direction of the drawer portion.

  Preferably, the attachment hole of the drawer portion has a long hole shape that is long in a direction intersecting with the extending direction of the drawer portion.

  A cell stack device according to a second aspect of the present invention includes a manifold, a fuel cell, and any one of the end current collecting members. The fuel cell extends upward from the manifold. The end current collecting member is electrically connected to the fuel battery cell. The joining portion of the end current collecting member is joined to the fuel cell.

  Preferably, the cell stack device further includes a housing. The housing has an extraction hole and accommodates the manifold and the fuel cell. The lead-out portion of the end current collecting member extends to the outside of the housing through the take-out hole of the housing.

  Preferably, the manifold has a manifold body and a plate-like member. The manifold body has a box shape that opens upward or downward. The plate-like member closes the opening. The manifold body has a plurality of flat plate portions and corner portions connecting the flat plate portions. The thickness of the corner portion is smaller than the thickness of the flat plate portion.

  According to this configuration, the thickness of the corner portion is smaller than the thickness of the flat plate portion in the box-shaped manifold body. For this reason, when the cell stack device in which the fuel cells are joined to each other using the joining material in the manifold is operated and the temperature distribution is generated, the corner portion is preferentially deformed. Since the corners can absorb the distortion, deformation of the joining region between the fuel cell and the manifold can be suppressed. Therefore, cracks due to the deformation of the manifold can be suppressed in the bonding material for bonding the manifold and the fuel battery cell.

  Preferably, the manifold is disposed on the pedestal. The manifold has a bottom wall, a side wall, an upper wall, and a plurality of protrusions. The side wall extends upward from the bottom wall. The upper wall closes the upper end of the side wall, and the fuel cell is joined. The plurality of protrusions are attached to the bottom wall and contact the pedestal. The protrusion is made of a material different from the material forming the bottom wall.

  According to this configuration, during operation of the cell stack device in which the fuel cells are joined to the upper wall of the manifold using the joining material, when the fuel cells become hotter than the manifold, the temperature increases from the bottom wall to the pedestal. The path for transferring the heat is a plurality of protrusions. Since the plurality of protrusions and the pedestal are in contact, the contact area between the manifold and the pedestal can be reduced. For this reason, the heat loss from a manifold to a base can be suppressed. Moreover, since the material which comprises a projection part and a bottom wall differs, the freedom degree of the projection part attached to a bottom wall is high. For this reason, according to a specification, a protrusion part can be provided in the position which can suppress effectively the heat loss from a manifold to a base. Therefore, since the temperature drop of the manifold can be effectively suppressed, the stress applied to the bonding material for bonding the fuel cells can be suppressed. Therefore, since cracks in the bonding material can be suppressed, leakage of the reaction gas from the bonding material when used in the cell stack device can be suppressed.

  Preferably, the surface roughness Rz of the surface facing the pedestal on the bottom wall is 0.01z or more. In this case, since the contact area between the bottom wall and the pedestal can be further reduced, the temperature drop of the manifold can be further suppressed. For this reason, the stress added to the joining material which joins a fuel cell can be suppressed more, and the crack in a joining material can be suppressed more.

  Preferably, the ratio of the area where the protrusion and the pedestal are in contact with the area of the lower surface of the bottom wall (the area of contact / the area of the lower surface) is 15% or less, more preferably 10% or less. In this case, since the contact area between the bottom wall and the pedestal is small, the temperature drop of the manifold can be further suppressed. For this reason, the stress added to the joining material which joins a fuel cell can be suppressed more, and the crack in a joining material can be suppressed more.

  Preferably, the protrusion is made of an inorganic material. A cell stack apparatus including a manifold operates at a high temperature and a load of the entire cell stack apparatus is applied to the protrusions. However, an inorganic material is more resistant to a high temperature creep phenomenon than a metal material. Therefore, it is preferable that the material of the protrusion is made of an inorganic material.

  Preferably, the protrusion is made of a material having a thermal conductivity smaller than that of the material forming the bottom wall. Thereby, since the protrusion part which contacts a base has a thermal conductivity smaller than a bottom wall, the heat loss from a manifold to a base can be suppressed more. For this reason, since the fall of the temperature of a manifold can be suppressed more, the crack in the joining material which joins a fuel cell can be suppressed more.

  Preferably, the thermal conductivity of the material constituting the protrusion is preferably 40 W / m · K or less, more preferably 20 W / m · K or less. In this case, the temperature drop of the manifold due to heat conduction from the manifold to the pedestal can be further suppressed. For this reason, a fuel cell can be supported more stably.

  Preferably, the protrusion is made of mineral or ceramic. The protrusions made of mineral or ceramic can be easily attached to the bottom wall.

  Preferably, the manifold has a coating film formed on the lower surface of the bottom wall. And the projection part is attached to the bottom wall through the coating film. The protrusion can be easily attached to the bottom wall by the coating film. Note that the protrusion and the coating film may be formed of the same material, or a part of the coating film may be formed in a protrusion shape.

  Preferably, the upper wall is made of a material containing chromium, and further has a coating film formed on the entire surface of the upper wall. The coating film can prevent the chromium constituting the upper wall from volatilizing.

  ADVANTAGE OF THE INVENTION According to this invention, the edge part current collection member which is hard to peel from a fuel cell can be provided.

The perspective view of a cell stack apparatus. Sectional drawing of a cell stack apparatus. The perspective view of a fuel cell. Sectional drawing of a fuel cell. The expanded sectional view of a cell stack device. The perspective view of an edge part current collection member. Sectional drawing of an edge part current collection member. The expanded sectional view of the cell stack apparatus concerning a modification. Sectional drawing of the cell stack apparatus which concerns on a modification. The perspective view of the edge part current collection member which concerns on a modification. The perspective view of the edge part current collection member which concerns on a modification. The perspective view of the edge part current collection member which concerns on a modification. The perspective view of the edge part current collection member which concerns on a modification. The perspective view of the edge part current collection member which concerns on a modification. The perspective view of the edge part current collection member which concerns on a modification. The enlarged plan view of the edge part current collection member which concerns on a modification. The enlarged plan view of the edge part current collection member which concerns on a modification. The expanded sectional view of the edge part current collection member concerning a modification. The expanded sectional view of the manifold which concerns on a modification. The expanded sectional view of the manifold which concerns on a modification. The expanded sectional view of the manifold which concerns on a modification. The expanded sectional view of the manifold which concerns on a modification.

[Cell stack equipment]
Embodiments of an end current collecting member and a cell stack device according to the present invention will be described below with reference to the drawings. As shown in FIGS. 1 and 2, the cell stack device 100 includes a plurality of fuel cells 1, a manifold 2, and a pair of end current collecting members 3. The cell stack apparatus 100 is covered with a casing 90. The housing 90 is made of a metal material. For example, the housing 90 is made of ferritic stainless steel, austenitic stainless steel, Ni-based alloy, or the like.

[Manifold]
The manifold 2 is configured to distribute gas to each fuel cell 1. The manifold 2 is hollow and has an internal space. A gas such as fuel gas is supplied to the internal space of the manifold 2 through the introduction pipe 201. The manifold 2 has a plurality of through holes 27 that allow the internal space to communicate with the outside.

  The manifold 2 supports each fuel cell 1. The manifold 2 includes a manifold main body 21 and an upper wall 22 (an example of a lid member). The manifold body 21 and the upper wall 22 are separate members and are joined to each other. The manifold body 21 and the upper wall 22 may be integrally formed. The manifold body 21 and the upper wall 22 define an internal space of the manifold 2.

  The manifold body 21 has a rectangular parallelepiped shape and has an internal space whose upper surface is open. Specifically, the manifold body 21 has a bottom wall 23 and a side wall 24. The side wall 24 extends upward from the peripheral edge of the bottom wall 23. The introduction pipe 201 is attached to the side wall 24 and communicates with the internal space of the manifold 2. The introduction pipe 201 extends upward, for example.

For example, the manifold body 21 is formed of a metal having heat resistance or insulating ceramics. More specifically, the manifold body 21 is made of ferritic stainless steel, austenitic stainless steel, Ni-based alloy, MgO (magnesium oxide), Al ₂ O ₃ (aluminum oxide), MgAl ₂ O ₄ (magnesia alumina spinel), It is formed of at least one selected from the group consisting of MgO · SiO ₂ (steatite) and 2MgO · SiO ₂ (forsterite).

  The upper wall 22 is attached to the manifold body 21 so as to block the upper surface of the manifold body 21. For example, the upper wall 22 and the manifold body 21 are joined by crystallized glass or the like. The upper wall 22 can be formed from at least one of the materials of the manifold body 21 described above.

  The upper wall 22 is configured such that each fuel cell 1 is attached. Specifically, the upper wall 22 has a plurality of through holes 27. Each through hole 27 extends in the width direction (y-axis direction) of the manifold 2. Moreover, each through-hole 27 is arrange | positioned at intervals in the sequence direction (z-axis direction).

[Fuel battery cell]
Each fuel cell 1 extends upward from the manifold 2. Specifically, each fuel cell 1 extends upward from the upper wall 22 of the manifold 2. The lower end portion of the fuel battery cell 1 is inserted into the through hole 27. The lower end portion of the fuel cell 1 may protrude downward from the upper wall 22. The length of the fuel cell 1 in the longitudinal direction (x-axis direction) can be, for example, about 100 to 300 mm. In the state where the lower end portion of the fuel cell 1 is inserted into the through hole 27, a gap is formed between the outer peripheral surface of the lower end portion of the fuel cell 1 and the inner wall surface of the through hole 27. This gap may be filled with a third bonding material 103 described later.

  The fuel cells 1 are arranged at intervals from each other along the arrangement direction (z-axis direction). In addition, although it is preferable that each fuel cell 1 is arrange | positioned at equal intervals along the sequence direction, it does not need to be arrange | positioned at equal intervals.

  As shown in FIG. 3, the fuel cell 1 includes a plurality of power generation element portions 11 and a support substrate 12.

[Support substrate]
The support substrate 12 extends upward from the manifold 2. That is, the support substrate 12 extends in the vertical direction. The support substrate 12 has a plurality of gas flow paths 121 extending in the longitudinal direction (x-axis direction) of the support substrate 12 inside. The gas flow paths 121 are arranged at intervals from each other in the width direction (y-axis direction) of the support substrate 12. The gas flow path 121 communicates with the internal space of the manifold 2.

  The longitudinal direction (x-axis direction) of the support substrate 12 is the same direction as the longitudinal direction of the fuel cell 1. Each gas channel 121 extends substantially parallel to each other. Each gas flow path 121 is open at both end faces in the longitudinal direction of the support substrate 12.

  As shown in FIG. 4, the support substrate 12 has a plurality of first recesses 123. Each first recess 123 is formed on both surfaces of the support substrate 12. The first recesses 123 are arranged at intervals in the longitudinal direction of the support substrate 12.

The support substrate 12 is made of a porous material that does not have electronic conductivity. The support substrate 12 can be made of, for example, CSZ (calcia stabilized zirconia). Alternatively, the support substrate 12 may be composed of NiO (nickel oxide) and YSZ (8YSZ) (yttria stabilized zirconia), or composed of NiO (nickel oxide) and Y ₂ O ₃ (yttria). Alternatively, MgO (magnesium oxide) and MgAl ₂ O ₄ (magnesia alumina spinel) may be used. The porosity of the support substrate 12 is, for example, about 20 to 60%.

[Power generation element]
Each power generating element portion 11 is supported on both surfaces of the support substrate 12. Each power generation element unit 11 may be supported only on one side of the support substrate 12. The respective power generation element portions 11 are arranged in the longitudinal direction (x-axis direction) of the fuel battery cell 1. That is, the respective power generation element portions 11 are arranged in the vertical direction. The fuel cell 1 according to the present embodiment is a so-called horizontal stripe fuel cell.

  Each power generation element portion 11 includes a power generation element main body portion 110 and an electrical connection portion 111. The power generation element main body 110 includes a fuel electrode 13, an electrolyte 14, and an air electrode 15. Each power generation element unit 11 further includes a reaction preventing film 16. The fuel electrode 13 is a fired body made of a porous material having electron conductivity. The fuel electrode 13 includes a fuel electrode current collector 131 and a fuel electrode active part 132.

  The fuel electrode current collector 131 is disposed in the first recess 123. Specifically, the fuel electrode current collector 131 is filled in the first recess 123 and has the same outer shape as the first recess 123. Each fuel electrode current collector 131 has a second recess 131a and a third recess 131b. The anode active part 132 is disposed in the second recess 131a. Specifically, the fuel electrode active part 132 is filled in the second recess 131a.

The fuel electrode current collector 131 can be composed of, for example, NiO (nickel oxide) and YSZ (8YSZ) (yttria stabilized zirconia). Alternatively, the fuel electrode current collector 131 may be composed of NiO (nickel oxide) and Y ₂ O ₃ (yttria), or composed of NiO (nickel oxide) and CSZ (calcia stabilized zirconia). Also good. The thickness of the fuel electrode current collector 131 and the depth of the first recess 123 are about 50 to 500 μm.

  The fuel electrode active part 132 can be composed of, for example, NiO (nickel oxide) and YSZ (8YSZ) (yttria stabilized zirconia). Alternatively, the fuel electrode active part 132 may be composed of NiO (nickel oxide) and GDC (gadolinium-doped ceria). The thickness of the fuel electrode active part 132 is 5 to 30 μm.

  The electrolyte 14 is disposed so as to cover the fuel electrode 13. Specifically, the electrolyte 14 extends between the adjacent interconnectors 112 in the longitudinal direction. That is, the electrolyte 14 and the interconnector 112 are alternately arranged in the longitudinal direction of the fuel cell 1.

  The electrolyte 14 is a fired body made of a dense material that has ionic conductivity and no electronic conductivity. The electrolyte 14 can be composed of, for example, YSZ (8YSZ) (yttria stabilized zirconia). Or the electrolyte 14 may be comprised from LSGM (lanthanum gallate). The thickness of the electrolyte 14 is, for example, about 3 to 50 μm.

  The reaction preventing film 16 is a fired body composed of a dense material. The reaction preventing film 16 is disposed between the electrolyte 14 and the air electrode 15. The reaction preventing film 16 suppresses occurrence of a phenomenon in which a reaction layer having a large electric resistance is formed at the interface between the electrolyte 14 and the air electrode 15 due to a reaction between YSZ in the electrolyte 14 and Sr in the air electrode 15. Is provided.

The reaction preventing film 16 is made of a material containing ceria containing a rare earth element. The reaction preventing film 16 can be made of, for example, GDC = (Ce, Gd) O ₂ (gadolinium-doped ceria). The thickness of the reaction preventing film 16 is, for example, about 3 to 50 μm.

The air electrode 15 includes an air electrode active part 151 and an air electrode current collector 152. The air electrode active part 151 is disposed on the reaction preventing film 16. The air electrode active part 151 is a fired body made of a porous material having electronic conductivity. The air electrode active part 151 can be composed of, for example, LSCF = (La, Sr) (Co, Fe) O ₃ (lanthanum strontium cobalt ferrite). Alternatively, the air electrode active portion 151 may have LSF = (La, Sr) FeO ₃ (lanthanum strontium ferrite), LNF = La (Ni, Fe) O ₃ (lanthanum nickel ferrite), or LSC = (La, Sr) CoO. ₃ (lanthanum strontium cobaltite) or the like. The air electrode active part 151 may be configured by two layers of a first layer (inner layer) composed of LSCF and a second layer (outer layer) composed of LSC. The thickness of the air electrode active part 151 is, for example, 10 to 100 μm.

  The air electrode current collector 152 is disposed on the air electrode active part 151. The air electrode current collector 152 extends from the air electrode active part 151 toward the adjacent power generation element part 11. Specifically, the air electrode current collector 152 extends to the interconnector 112 that is the electrical connection 111 of the adjacent power generation element 11. The air electrode current collector 152 is a fired body made of a porous material having electronic conductivity.

The air electrode current collector 152 can be made of, for example, LSCF = (La, Sr) (Co, Fe) O ₃ (lanthanum strontium cobalt ferrite). Alternatively, the air electrode current collector 152 may be made of LSC = (La, Sr) CoO ₃ (lanthanum strontium cobaltite). Or the air electrode current collection part 152 may be comprised from Ag (silver) and Ag-Pd (silver palladium alloy). The thickness of the air electrode current collector 152 is, for example, about 50 to 500 μm.

  Among the power generation element units 11, the remaining power generation element units 11 excluding the lower power generation element unit 11 a arranged at the lowermost side have an interconnector 112 as an electrical connection unit 111. The interconnector 112 is configured to electrically connect adjacent power generation element main body portions 110 to each other.

The interconnector 112 is disposed in the third recess 131b. Specifically, the interconnector 112 is embedded (filled) in the third recess 131b. The interconnector 112 is a fired body composed of a dense material having electronic conductivity. The interconnector 112 can be composed of, for example, LaCrO ₃ (lanthanum chromite). Alternatively, the interconnector 112 may be made of (Sr, La) TiO ₃ (strontium titanate). The thickness of the interconnector 112 is, for example, 10 to 100 μm.

  As shown in FIG. 5, among the power generation element portions 11, the lower power generation element portion 11 a disposed at the lowermost side includes a power generation element main body portion 110 and an electrical connection portion 111. In addition, when the power generation element unit 11 is disposed on both surfaces of the support substrate 12, the lower power generation element unit 11 a is disposed on each of both surfaces of the support substrate 12. The electrical connection portion 111 is electrically connected to the power generation element main body portion 110. Further, the electrical connection portion 111 extends downward from the power generation element main body portion 110. The electrical connection portion 111 of the lower power generation element portion 11 a includes a first connection portion 113 and a second connection portion 114.

  The 1st connection part 113 has the structure similar to the interconnector 112 mentioned above. That is, the first connection portion 113 is disposed in the third recess 131 b of the fuel electrode current collector 131. The 1st connection part 113 is comprised from the precise | minute material which has electronic conductivity. The first connection portion 113 can be formed of any of the materials for the interconnector 112 described above.

  The second connection portion 114 can be formed of any of the materials for the air electrode current collector 152 described above. The second connection part 114 is electrically connected to the first connection part 113. In addition, the second connection portion 114 extends downward from the first connection portion 113.

  The lower end of the fuel cell 1 is covered with a dense film 18. Specifically, the dense film 18 covers the support substrate 12. The dense film 18 extends downward from between the second connection portion 114 and the support substrate 12.

  The dense membrane 18 exhibits a gas seal function that prevents mixing of the fuel gas flowing in the space inside the dense membrane 18 and the air flowing in the space outside the dense membrane 18. In order to exhibit this gas sealing function, the porosity of the dense film 18 is, for example, 10% or less. The dense film 18 is made of insulating ceramics.

  Specifically, the dense film 18 can be constituted by the electrolyte 14 and the reaction preventing film 16 described above. The electrolyte 14 constituting the dense film 18 covers the support substrate 12 and extends from the first connecting portion 113 to the vicinity of the lower end of the support substrate 12. Further, the reaction preventing film 16 constituting the dense film 18 is disposed between the electrolyte 14 and the second connection portion 114. The dense film 18 may be composed of only the electrolyte 14 or may be composed of a material other than the electrolyte 14 and the reaction preventing film 16.

[End current collector]
As shown in FIGS. 1 and 2, the pair of end current collecting members 3 are configured to extract electric power from a cell stack including a plurality of fuel cells 1. Each end current collecting member 3 is attached to each fuel cell 1 disposed at both ends in the arrangement direction (z-axis direction) of each fuel cell 1. The pair of end current collecting members 3 are only different in attachment positions and are substantially the same in structure. Therefore, only one end current collecting member 3 will be described below.

  As shown in FIG. 5, the end current collecting member 3 is electrically connected to the lower power generation element portion 11a of the fuel cell 1 disposed at the end in the arrangement direction (z-axis direction). Specifically, the end current collecting member 3 is connected to the electrical connection portion 111 of the lower power generation element portion 11a.

  As shown in FIGS. 6 and 7, the end current collecting member 3 includes a joint portion 31, a connecting portion 32, and a drawer portion 33. The joining part 31, the connection part 32, and the drawer | drawing-out part 33 are comprised by one member. For example, the joining part 31, the connection part 32, and the drawer | drawing-out part 33 are comprised from the metal plate of 1 sheet. The thicknesses of the joint portion 31, the connection portion 32, and the lead-out portion 33 can be set to about 0.1 to 2.0 mm, for example.

  The joining part 31, the connection part 32, and the drawer | drawing-out part 33 are comprised from the metal material. The junction part 31, the connection part 32, and the drawer | drawing-out part 33 contain iron and chromium. Preferably, the joining part 31, the connection part 32, and the drawer | drawing-out part 33 are comprised from stainless steel material. Specifically, the joining part 31, the connection part 32, and the drawer | drawing-out part 33 are comprised from ferritic stainless steel, austenitic stainless steel, or Ni base alloy.

[Joint part]
The joining portion 31 is configured to be joined to the fuel battery cell 1. The joining part 31 is plate-shaped. Specifically, the joint portion 31 has a rectangular shape having a longitudinal direction and a short direction in the arrangement direction view (z-axis direction view). The longitudinal direction of the joint portion 31 extends along the width direction (y-axis direction) of the fuel cell 1. Further, the short side direction of the joint portion 31 extends along the longitudinal direction (x-axis direction) of the fuel cell 1.

  The joining portion 31 has a first end portion 31a and a second end portion 31b. The first end 31a is one end in the short direction (x-axis direction), and the second end 31b is the other end in the short direction (x-axis direction). That is, the first end portion 31a and the second end portion 31b are located on the opposite sides.

  The joint portion 31 has a plurality of through holes 310. The through-hole 310 is formed in a slit shape and extends in the longitudinal direction (y-axis direction) of the joint portion 31. The width W1 of the joint portion 31 can be set to be approximately the same as the width of the lower power generation element portion 11a, for example.

As shown in FIG. 5, the joint portion 31 is joined to the lower power generation element portion 11a. Specifically, the joint portion 31 is joined to the electrical connection portion 111. For example, the joining portion 31 is joined to the lower power generation element portion 11 a by the first joining material 101. The first bonding material 101 is at least one selected from, for example, (Mn, Co) ₃ O ₄ , (La, Sr) MnO ₃ , and (La, Sr) (Co, Fe) O _3. .

  As shown in FIG. 7, the first bonding material 101 is disposed between the power generation element portion 11 and the bonding portion 31 and enters the through holes 310 of the bonding portion 31. Therefore, the end current collecting member 3 is firmly bonded to the power generating element portion 11. Further, a part of the first bonding material 101 protrudes onto the bonding portion 31, so that the first bonding material 101 is bonded more firmly by the anchor effect.

  As illustrated in FIG. 6, the joint portion 31 includes a pair of first outer peripheral portions 311, a pair of second outer peripheral portions 312, an intermediate portion 313, and a plurality of rib portions 314.

  Each first outer peripheral portion 311 extends in the longitudinal direction (y-axis direction). Moreover, each 1st outer peripheral part 311 is arrange | positioned at intervals in the transversal direction (x-axis direction).

  Each second outer peripheral portion 312 extends in the short direction (x-axis direction). The second outer peripheral portions 312 are arranged with a space therebetween in the longitudinal direction (y-axis direction). The second outer peripheral portions 312 connect the end portions of the first outer peripheral portions 311 to each other. As described above, the pair of first outer peripheral portions 311 and the pair of second outer peripheral portions 312 are connected in an annular shape. In other words, the pair of first outer peripheral portions 311 and the pair of second outer peripheral portions 312 constitute the outer peripheral portion of the joint portion 31.

  The intermediate portion 313 is disposed between the pair of second outer peripheral portions 312. And the intermediate part 313 is extended in the transversal direction (x-axis direction), and has connected a pair of 1st outer peripheral parts 311. That is, the intermediate portion 313 extends from one first outer peripheral portion 311 to the other first outer peripheral portion 311. Preferably, the intermediate portion 313 connects the central portions of the pair of first outer peripheral portions 311. That is, the intermediate portion 313 extends in the short direction at the central portion of the joint portion 31.

  Each rib portion 314 extends in the longitudinal direction (y-axis direction) so as to connect each second outer peripheral portion 312 and the intermediate portion 313. Specifically, among the rib portions 314, some rib portions 314 extend between one second outer peripheral portion 312 and the intermediate portion 313, and the other rib portion 314 is the other second outer peripheral portion. It extends between the part 312 and the intermediate part 313. Each rib portion 314 extends substantially parallel to the first outer peripheral portion 311.

  Some of the through holes 310 among the through holes 310 are defined by a first outer peripheral portion 311, a second outer peripheral portion 312, an intermediate portion 313, and a rib portion 314. Further, the other through holes 310 are defined by the second outer peripheral portion 312, the intermediate portion 313, and the rib portion 314.

[Connecting part]
The connecting part 32 extends from the first end part 31 a of the joint part 31. Preferably, the connecting portion 32 extends from the longitudinal center portion of the first end portion 31a. Further, the connecting portion 32 extends toward the second end portion 31 b of the joint portion 31. That is, the connecting portion 32 extends along the short direction (x-axis direction) of the joint portion 31. The distal end portion 32b of the connecting portion 32 extends beyond the second end portion 31b of the joint portion 31 in the short direction (x-axis direction). That is, in the present embodiment, the distal end portion 32 b of the connecting portion 32 is located below the second end portion 31 b of the joining portion 31. Thus, the length of the connecting portion 32 is longer than the length of the joining portion 31 in the short direction.

  A base end portion 32 a of the connecting portion 32 is connected to the joint portion 31. The distal end portion 32 b of the connecting portion 32 is connected to the drawer portion 33. The connecting portion 32 is disposed at a distance from the joint portion 31 in the arrangement direction (z-axis direction) except for a part of the base end portion 32a.

  The base end portion 32a of the connecting portion 32 is bent so that the extending direction is reversed. Specifically, the base end portion 32a is bent in a U shape when the joint portion 31 is viewed in the longitudinal direction (viewed in the y-axis direction). That is, the base end portion 32a extends upward from the first end portion 31a of the joint portion 31, and then bends and extends downward.

[Drawer part]
As shown in FIG. 6, the drawer portion 33 extends from the distal end portion 32 b of the connecting portion 32. Further, the drawer portion 33 extends in a direction away from the joint portion 31. The lead-out part 33 extends in a direction (z-axis direction) orthogonal to the surface direction of the joint part 31. Preferably, the drawer portion 33 extends horizontally from the distal end portion 32 b of the connecting portion 32.

  The width W2 of the drawer portion 33 is the same as the width of the connecting portion 32, for example. In addition, the width W1 of the joint portion 31 is larger than the width of the connecting portion 32 or the width w2 of the lead-out portion 33. In addition, width W1, W2 of each part of the edge part current collection member 3 means the dimension in a longitudinal direction (y-axis direction).

  As shown in FIG. 2, the leading end of the drawer portion 33 extends beyond the housing 90 to the outside of the housing 90. The housing 90 has an extraction hole 91, and the drawer portion 33 extends to the outside of the housing 90 through the extraction hole 91. A lead wire of an external circuit or the like is attached to the leading end portion of the drawer portion 33. For example, an attachment portion such as an attachment hole 331 or an attachment concave portion for attaching a lead wire is formed at the distal end portion of the drawer portion 33. The attachment hole 331 opens in the short direction (x-axis direction) of the joint portion 31. That is, the attachment hole 331 is open in the vertical direction.

[Current collector between cells]
As shown in FIG. 2, each fuel cell 1 is electrically connected to each other via an inter-cell current collecting member 4. The inter-cell current collecting member 4 is disposed between the fuel cells 1 and electrically connects the adjacent fuel cells 1. The inter-cell current collecting member 4 is formed of a conductive material. For example, the inter-cell current collecting member 4 is formed of a sintered body of oxide ceramics or a metal. The inter-cell current collecting member 4 is joined to each fuel cell 1 by the second joining material 102. For example, the second bonding material 102 can be made of any of the materials mentioned as the material of the first bonding material 101.

[Front and back connection members]
In each fuel cell 1, the power generation element portion 11 formed on one surface of the support substrate 12 and the power generation element portion 11 formed on the other surface of the support substrate 12 are electrically connected by the front / back connection member 5. ing. Specifically, the front / back connection member 5 electrically connects the power generating element portions 11 disposed at the uppermost positions on one side and the other side of the support substrate 12.

[Third bonding material]
Each fuel cell 1 is fixed to the manifold 2 by a third bonding material 103. The third bonding material 103 joins the fuel battery cell 1 and the upper wall 22 of the manifold 2. The third bonding material 103 joins the lower end portion of the fuel battery cell 1 and the upper wall 22 of the manifold 2. As shown in FIG. 5, the third bonding material 103 is in contact with the dense film 18.

The third bonding material 103 is, for example, crystallized glass. As the crystallized glass, for example, a SiO ₂ —B ₂ O ₃ system, a SiO ₂ —CaO system, or a SiO ₂ —MgO system may be employed. In this specification, crystallized glass means that the ratio (crystallinity) of “volume occupied by crystal phase” to the total volume is 60% or more, and “volume occupied by amorphous phase and impurities relative to the total volume”. "Indicates a glass having a ratio of less than 40%. As the material of the third bonding material 103, amorphous glass, brazing material, ceramics, or the like may be employed. Specifically, the third bonding material 103 is at least one selected from the group consisting of SiO ₂ —MgO—B ₂ O ₅ —Al ₂ O ₃ and SiO ₂ —MgO—Al ₂ O ₃ —ZnO. .

[Power generation method]
The cell stack device 100 configured as described above generates power as follows. By flowing a fuel gas (hydrogen gas or the like) through the manifold 2 into the gas flow path 121 of each fuel battery cell 1 and exposing both surfaces of the support substrate 12 to a gas (air or the like) containing oxygen, An electromotive force is generated by a difference in oxygen partial pressure generated between the two side surfaces. When this cell stack device 100 is connected to an external load using the end current collecting member 3, an electrochemical reaction shown in the following formula (1) occurs in the air electrode 15, and shown in the following formula (2) in the fuel electrode 13. An electrochemical reaction occurs and current flows.
(1/2) · O ₂ + 2e ⁻ → O ²⁻ (1)
H ₂ + O ²⁻ → H ₂ O + 2e ⁻ (2)

[Modification]
As mentioned above, although embodiment of this invention was described, this invention is not limited to these, A various change is possible unless it deviates from the meaning of this invention.

Modification 1
In the above embodiment, the joint portion 31 has a plurality of through holes 310, but the joint portion 31 may not have the through holes 310.

Modification 2
In the said embodiment, although the edge part current collection member 3 is joined to the electrical connection part 111 of the lower power generation element part 11a, it is not limited to this in particular. For example, as shown in FIG. 8, the end current collecting member 3 may be joined to the power generation element main body 110 of the lower power generation element portion 11a. In this case, the lower power generation element portion 11a may not have the electrical connection portion 111.

Modification 3
In the said embodiment, although the edge part current collection member 3 is electrically joined to the lower power generation element part 11a, you may be joined to power generation element parts 11 other than the lower power generation element part 11a. For example, as shown in FIG. 9, the end current collecting member 3 may be joined to the upper power generating element portion 11b. In this case, it is preferable to arrange the end current collecting member 3 so that the first end portion 31a of the joining portion 31 is located on the lower side and the second end portion 31b is located on the upper side.

Modification 4
In the above-described embodiment, the manifold 2 has the manifold main body 21 whose upper surface is open, but the configuration of the manifold 2 is not limited to this. For example, the bottom surface of the manifold body 21 may be open, and the bottom surface of the manifold body 21 may be closed by the bottom wall.

Modification 5
In the above embodiment, the introduction pipe 201 is attached to the side wall 24 of the manifold 2, but the attachment position of the introduction pipe 201 is not limited to this. For example, the introduction pipe 201 may be attached to the upper wall 22 of the manifold 2.

Modification 6
In the said embodiment, although the front-end | tip part 32b of the connection part 32 is extended beyond the 2nd end part 31b of the junction part 31, it is not limited to this. For example, the distal end portion 32 b of the connecting portion 32 may be at the same position as the second end portion 31 b of the joining portion 31 in the short direction (x-axis direction) of the joining portion 31, or the second end of the joining portion 31. You may be located above the edge part 31b.

Modification 8
In the above embodiment, the through hole 310 is formed in a slit shape, but the configuration of the through hole 310 is not limited to this. For example, as shown in FIG. 10, the through hole 310 may be circular.

Modification 9
In the said embodiment, the 1st end part 31a of the junction part 31 is one end part in a transversal direction (x-axis direction), and the 2nd end part 31b is the other end in a transversal direction (x-axis direction). Although it was an edge part, the structure of the junction part 31 is not limited to this.

  For example, as shown in FIG. 11, the first end 31a is one end in the longitudinal direction (y-axis direction), and the second end 31b is the other end in the longitudinal direction (y-axis direction). May be. Since the connecting portion 32 extends from the first end portion 31a of the joint portion 31 toward the second end portion 31b, it extends along the longitudinal direction (y-axis direction) of the joint portion 31. In addition, the front-end | tip part 32b of the connection part 32 is extended to the center part of the junction part 31 in a longitudinal direction (y-axis direction). And the main surface of the drawer | drawing-out part 33 has faced the longitudinal direction (y-axis direction) of the junction part 31. FIG. For this reason, the attachment hole 331 is open in the longitudinal direction of the joint portion 31. That is, the attachment hole 331 is open in the horizontal direction.

Modification 10
In the said embodiment, although the drawer | drawing-out part 33 is arrange | positioned at the center area | region R3 side of the junction part 31, it is not limited to this. In addition, the junction part 31 has 1st area | region R1, 2nd area | region R2, and center area | region R3. The first region R1 and the second region R2 are arranged so as to sandwich the central region R3 in the width direction (y-axis direction). That is, in the width direction, the first region R1, the central region R3, and the second region R2 are arranged in this order. The central region R3 is a region that is disposed in the center of the joint portion 31 in the width direction and occupies about 10% of the width of the joint portion 31.

  As illustrated in FIG. 12, the drawer portion 33 may be disposed on the second region R2 side of the joint portion 31. The distal end portion 32b of the connecting portion 32 is disposed on the second region R2 side of the joining portion 31. In addition, the drawer | drawing-out part 33 may be arrange | positioned at the 1st area | region R1 side. At this time, the distal end portion 32b of the connecting portion 32 is disposed on the first region R1 side of the joining portion 31.

  The connecting portion 32 extends from the first end portion 31a of the second region R2 of the joint portion 31. That is, the base end portion 32 a of the connecting portion 32 is disposed on the second region R <b> 2 side of the joint portion 31.

Modification 11
13-15, the drawer | drawing-out part 33 may be arrange | positioned at the 1st area | region R1 side, and the connection part 32 may extend from the 1st end part 31a of center area | region R3 of the junction part 31. As shown in FIG. For example, the connecting portion 32 extends from the first end portion 31a of the joint portion 31 toward the second end portion 31b, and extends from the central region R3 of the joint portion 31 toward the first region R1. In addition, the drawer | drawing-out part 33 may be arrange | positioned at the 2nd area | region R2 side. In this case, the connecting portion 32 extends from the first end portion 31a of the joint portion 31 toward the second end portion 31b, and extends from the central region R3 of the joint portion 31 toward the second region R2.

  In FIG. 13, the connecting portion 32 extends in an inclined manner. 14 and 15, the connecting portion 32 has a first connecting portion 321 and a second connecting portion 322. The first connecting portion 321 extends from the first end portion 31a of the joint portion 31 toward the second end portion 31b. The second connecting portion 322 extends from the central region R3 toward the first region R1. In FIG. 14, the main surface of the first connecting portion 321 and the main surface of the second connecting portion 322 face the same direction (z-axis direction). In FIG. 15, the main surface of the first connecting portion 321 and the main surface of the second connecting portion 322 face different directions. Specifically, the main surface of the first connecting portion 321 faces the same direction (z-axis direction) as the main surface of the joint portion 31. The main surface of the second connecting portion 322 faces the same direction (x-axis direction) as the main surface of the drawer portion 33.

Modification 12
In the said embodiment, although the attachment hole 331 of the drawer | drawing-out part 33 was circular shape, the shape of the attachment hole 331 is not limited to this. For example, as shown in FIGS. 16 and 17, the attachment hole 331 of the drawer portion 33 may have a long hole shape. In FIG. 16, the attachment hole 331 extends long in the direction in which the drawer portion 33 extends (z-axis direction).

  In FIG. 17, the attachment hole 331 extends long in the direction (y-axis direction) intersecting the direction in which the drawer portion 33 extends. In this case, the portion where the attachment hole 331 of the drawer portion 33 is formed may be wider in width (dimension in the y-axis direction) than the other portion.

Modification 13
The attachment hole 331 of the drawer part 33 may be a screw hole so that a bolt can be screwed together. Moreover, as shown in FIG. 18, the attachment hole 331 of the drawer | drawing-out part 33 may be a shape where the head part of a volt | bolt is accommodated. That is, the attachment hole 331 may include a large diameter portion 331a and a small diameter portion 331b having a smaller diameter than the large diameter portion 331a. In this case, the small diameter portion 331b may be a screw hole.

Modification 14
As shown in FIG. 19, the manifold body 21 may be configured such that the corner portion 26 is thinner than the other portions. Specifically, the manifold body 21 includes a plurality of flat plate portions and corner portions 26 that connect the flat plate portions. The flat plate portion is a flat plate-like portion. In addition, a corner | angular part is the part which forms a corner | angular part, ie, the corner vicinity. The plurality of flat plate portions include a rectangular flat plate portion that occupies most of the bottom wall 23, four rectangular flat plate portions that occupy most of the side wall 24, and an annular flat plate portion that occupies most of the flange portion 25. have. The corner portion 26 is a boundary portion between the bottom wall 23 and the side wall 24 and a boundary portion between the side wall 24 and the flange portion 25. Thus, the manifold main body 21 of this Embodiment consists of a some flat plate part and a some corner | angular part.

  In addition, although the corner | angular part 26 is R shape, the shape of a corner | angular part is not specifically limited. The corner portion may be a right angle formed by orthogonally intersecting a plurality of plane portions, or may have a shape (C chamfered shape) in which the intersecting portion of the plurality of plane portions is curved in a planar shape.

  The thickness T2 of the corner portion 26 is smaller than the thickness T1 of the flat plate portion. For this reason, the corner | angular part 26 is a site | part which deform | transforms with priority over a plane part, and is a deformable part. When the thicknesses of the plurality of flat plate portions are different, the minimum thickness is set as the thickness T1. The manifold body 21 has a plurality of corners 26, and when the thicknesses of the plurality of corners 26 are different, the minimum thickness is T2. In this modification, the thickness T2 of all corner portions 26 is smaller than the thickness T1 of the flat plate portion, but the thickness T2 of at least one corner portion 26 among the plurality of corner portions 26 is the thickness T1 of the flat plate portion. Smaller than that. The thicknesses T1 and T2 are plate thicknesses.

  The thickness T2 of the corner portion 26 is preferably 70.0% or more and 99.5% or less of the thickness T1 of the flat plate portion, and more preferably 75.0% or more and 98.0% or less. In the case of 70.0% or more, the strength of the manifold can be improved, and in the case of 75.0% or more, the strength of the manifold 2 can be further improved. When it is 99.5% or less, it is easy to deform. Therefore, by suppressing the deformation of the third bonding material 103, cracks in the third bonding material 103 can be suppressed, and when it is 98.0% or less, the third bonding material 103 The crack in can be effectively suppressed. Moreover, when it is 70.0% or more, it is possible to prevent the corner portion 26 of the manifold 2 from being broken during processing.

  The thickness T1 of the flat plate portion is, for example, not less than 0.5 mm and not more than 4.0 mm. The thickness T2 of the corner portion 26 is, for example, not less than 0.35 mm and not more than 3.9 mm.

  The outer peripheral portion of the upper wall 22 is disposed on the flange portion 25 and is joined to the flange portion 25. The upper wall 22 is joined to the flange portion 25 by, for example, a joining material or welding. The flange portion 25 extends outward from the upper end of the side wall 24. The thickness of the upper wall 22 constituting the plate-like member is not particularly limited, but can be made smaller than the thickness T1 of the corner portion 26 of the manifold body 21.

Modification 15
In the modification 14, the manifold body 21 is open at the top, but the manifold body 21 may be opened at the bottom. In this case, as shown in FIG. 20, the manifold body 21 has an upper wall 22, a side wall 24, and a flange portion 25. The flange portion 25 extends outward from the lower end portion of the side wall 24. A bottom wall 23 (an example of a plate-like member) is attached so as to close the lower surface of the manifold body 21.

  In the manifold main body 21 according to the modified example 15, the plurality of flat plate portions include a rectangular flat plate portion that occupies most of the upper wall 22, four rectangular flat plate portions that occupy most of the side wall 24, and a flange portion. And an annular flat plate portion occupying most of 25. The corner portion 26 is a boundary portion between the upper wall 22 and the side wall 24 and a boundary portion between the side wall 24 and the flange portion 25.

Modification 16
As shown in FIG. 21, a plurality of protrusions 28 may be attached to the bottom wall 23. The plurality of protrusions 28 are attached to the lower surface 231 of the bottom wall 23. For this reason, when the manifold 2 is arranged on the base B, the plurality of protrusions 28 come into contact with the base B. The plurality of protrusions 28 are dispersed on the lower surface 231 of the bottom wall 23 without being segregated. For this reason, the manifold 2 is stably arranged on the base B.

  The material constituting the protruding portion 28 is not particularly limited as long as it is made of a material different from the material constituting the bottom wall 23, but is preferably made of a material excluding metal, and is made of an inorganic material. It is more preferable. The inorganic material is preferably ceramic. The SOFC operates at a high temperature. However, when a constant stress is continuously applied to a metal material in a high temperature environment, high temperature creep deformation may occur and the shape may change. The protrusion 28 attached to the bottom wall 23 of the manifold 2 and in contact with the pedestal is subjected to the load of the entire cell stack device 100, and there is a concern about high-temperature creep deformation. On the other hand, since an inorganic material has higher resistance to a high temperature creep phenomenon than a metal material, it is preferable to use an inorganic material as the protrusion 28 that contacts the pedestal.

Moreover, it is preferable that the protrusion part 28 is comprised with the material which has a heat conductivity smaller than the heat conductivity of the material which comprises the bottom wall 23. FIG. Examples of such materials include minerals, ceramics, glass, or fibers. Examples of the mineral include mica (mica), vermiculite, and quartz. Examples of the ceramic include alumina, zirconia, silica, iron oxide, and chromium oxide. Examples of the glass include crystallized glass. As the crystallized glass, for example, a SiO ₂ —B ₂ O ₃ system, a SiO ₂ —CaO system, or a SiO ₂ —MgO system can be employed. Examples of the fibers include quartz wool, alumina, silica alumina, and the like.

  The thermal conductivity of the material constituting the protruding portion 28 is preferably 40 W / m · K or less, and more preferably 20 W / m · K or less. Since heat conduction from the bottom wall 23 to the base B can be reduced, the lower the thermal conductivity, the better. However, from the viewpoint that it can be easily realized, the lower limit is, for example, 0.01 W / m · K.

  The thermal conductivity is a value measured at 750 ° C. by a laser flash method.

  The surface roughness Rz of the surface facing the base B is preferably 0.01 z or more, and more preferably 0.05 z or more. Since the contact area between the bottom wall 23 and the pedestal B can be reduced, the surface roughness Rz is preferably as high as possible. However, considering the height of the cell stack device 1, the upper limit is, for example, 10z.

  In the present modification, the “surface facing the pedestal B” is a surface constituted by the lower surface 231 of the bottom wall 23 and the protruding portion 28. The surface roughness Rz is a value measured according to JIS B0601.

  The ratio of the area where the protrusion 28 and the pedestal B are in contact with the area of the lower surface 231 of the bottom wall 23 is preferably 15% or less, and more preferably 10% or less.

  The protrusion 28 has a convex shape that protrudes downward. The protrusion 28 has a small width, for example, downward (from the lower surface 231 to the base B). The protrusion 28 includes a protrusion provided as a member and a protrusion made of particles. The contact between the protrusion 28 and the base B may be a point contact. Further, in the case where the protruding portion 28 is a member, for example, it may be a rectangular piece in a plan view or a fiber piece.

  In the process of attaching the protrusion 28 to the lower surface 231 of the bottom wall 23, for example, the following is performed. A material to be the projection 28 is prepared which is made of a material having a thermal conductivity smaller than that of the material constituting the bottom wall 23. For example, a material that becomes glass, such as crystallized glass, is prepared as the material that becomes the protruding portion 28. This material is placed in contact with the lower surface 231 of the bottom wall 23 and baked.

Modification 17
As in the modification 16, in the aspect in which the protrusions 28 are attached to the bottom wall 23, the manifold 2 may further include a coating film 29. As shown in FIG. 22, the coating film 29 is formed on the lower surface 231 of the bottom wall 23. The protrusion 28 is attached to the bottom wall 23 via the coating film 29. At least a part of the protrusion 28 protrudes downward from the coating film 29. Note that the same member as the protrusion 28 may be embedded in the coating film 29.

  The coating film 29 is formed on the entire exposed surface. That is, the coating film 29 is exposed to the outside. Specifically, the coating film 29 is formed on the entire surface of the bottom wall 23, the side wall 24, the upper wall 22, and the flange portion 25. That is, the coating film 29 is formed on the entire outer surface and inner surface of the bottom wall 23, the side wall 24, the upper wall 22, and the flange portion 25. The outer side surface is a surface facing the outside of the manifold 2, and the inner side surface is a surface facing the internal space of the manifold 2.

  Specifically, the coating film 29 is formed on the entire upper surface 232, lower surface 231, and side surfaces of the bottom wall 23. The coating film 29 is formed on the entire inner surface and outer surface of the side wall 24. Further, the upper wall 22 is formed on the upper surface, the lower surface, the side surface, and the entire inner wall surface constituting the through hole 27. The coating film 29 is formed on the entire upper surface, lower surface, and side surfaces of the flange portion 25. In addition, the same material may be sufficient as the coating film which coat | covers each member of a manifold, and a different material may be sufficient as it.

  The coating film 29 is made of, for example, glass or ceramics, and is more preferably made of glass. For example, crystallized glass can be used as the glass. This crystallized glass may be the same material as the third bonding material 103. As ceramics, alumina, silica, perovskite materials, spinel materials, and the like can be used. The coating film 29 may be composed of a plurality of layers.

  The thickness of the coating film 29 is, for example, 3 to 200 μm. The porosity of the coating film 29 is, for example, 0 to 30%.

  The “surface facing the base B” in this modification is a surface formed by the coating film 29 formed on the lower surface 231 and the protrusions 28.

  The protrusion 28 may be made of the same material as the coating film 29 or may be made of a different material.

  In this modification, for example, the coating film 29 is formed, and then the protrusion 28 is formed.

  Specifically, first, a paste that becomes the coating film 29 is formed on the entire surface of the manifold body 21, that is, the entire exposed surface. The paste includes, for example, glass powder and does not include chromium. The paste is formed by, for example, coating or dipping.

  Next, a material for forming the protrusions 28 is attached to the paste formed on the lower surface of the bottom wall 23 and fired in this state. In this step, a material to be a protrusion may be disposed on the firing container (setter), and then the lower surface 231 of the bottom wall 23 may be disposed on this material and fired in this state.

DESCRIPTION OF SYMBOLS 1 Fuel cell 2 Manifold 3 End part current collection member 31 Junction part 31a 1st end part 31b 2nd end part 32 Connection part 32a Base end part 32b Front end part 33 Drawer part 90 Case 91 Extraction hole

Claims (22)

An end current collecting member for extracting electric power from the fuel cell,
A joint having a first end and a second end and configured to be joined to a main surface of the fuel cell;
A connecting portion extending from the first end of the joint to the second end;
A drawer portion extending from the distal end portion of the connecting portion and extending away from the joint portion;
An end current collecting member.
The base end portion of the connecting portion is bent so that the extending direction is reversed,
The end current collecting member according to claim 1.
The joint has a longitudinal direction and a lateral direction,
The first end of the joint is one end in the short direction,
The second end of the joint is the other end in the lateral direction.
The end current collecting member according to claim 1 or 2.
The connecting portion extends beyond the second end of the joining portion in the short direction.
The end current collecting member according to claim 3.
The joint has a longitudinal direction and a lateral direction,
The first end of the joint is one end in the longitudinal direction,
The second end of the joint is the other end in the longitudinal direction.
The end current collecting member according to claim 1 or 2.
The joint is rectangular.
The end current collecting member according to claim 1.
The longitudinal direction of the joint extends along the width direction of the fuel cell,
The end current collecting member according to claim 1.
The joining portion, the connecting portion, and the drawer portion are configured by one member.
The end current collecting member according to claim 1.
The joining portion, the connecting portion, and the drawer portion are configured from a single metal plate.
The end current collecting member according to claim 1.
The joint portion is arranged so as to sandwich a central region and the central region in the width direction.
And a second region,
The drawer portion is disposed on either one of the first and second regions of the joint portion.
The end current collecting member according to claim 1.
The distal end portion of the connecting portion is disposed on one side of the first and second regions of the joint portion.
The end current collecting member according to claim 10.
The connecting portion extends from the first end of one of the first and second regions of the joint portion,
The end current collecting member according to claim 10 or 11.
The connecting portion extends from the first end portion of a central region of the joint portion.
The end current collecting member according to claim 10 or 11.
The drawer portion has a mounting hole for mounting a lead wire.
The end current collecting member according to claim 1.
The attachment hole of the drawer part has a long hole shape that is long in the extending direction of the drawer part.
The end current collecting member according to claim 14.
The attachment hole of the drawer part has a long hole shape that is long in a direction intersecting with the extending direction of the drawer part.
The end current collecting member according to claim 14.
Manifold,
Fuel cells extending upward from the manifold;
The end current collecting member according to any one of claims 1 to 16, which is electrically connected to the fuel cell.
With
A joining portion of the end current collecting member is joined to a main surface of the fuel cell;
Cell stack device.
A housing having an extraction hole and accommodating the manifold and the fuel cell;
The lead-out portion of the end current collecting member extends to the outside of the casing through the extraction hole of the casing.
The cell stack device according to claim 17.
The manifold is
A box-shaped manifold body that opens upward or downward, and
A plate-like member that closes the opening;
Have
The manifold body is
A plurality of flat plate portions;
A corner portion connecting the flat plate portions;
Have
The thickness of the corner portion is smaller than the thickness of the flat plate portion,
The cell stack device according to claim 17 or 18.
The manifold is disposed on a pedestal;
The manifold is
The bottom wall,
A side wall extending upward from the bottom wall;
An upper wall that closes the upper end of the side wall and to which the fuel cell is joined;
A plurality of protrusions attached to the bottom wall and in contact with the pedestal;
Have
The protrusion is made of a material different from the material forming the bottom wall.
The cell stack device according to claim 17 or 18.
  Manifold,
  Fuel cells extending upward from the manifold;
  An end current collecting member electrically connected to the fuel cell;
With
  The end current collecting member is
    A joint having a first end and a second end and configured to be joined to the fuel cell;
    A connecting portion extending from the first end of the joint to the second end;
    A drawer portion extending from the distal end portion of the connecting portion and extending away from the joint portion;
Have
  The manifold is
    A box-shaped manifold body that opens upward or downward, and
    A plate-like member that closes the opening;
Have
  The manifold body is
    A plurality of flat plate portions;
    A corner portion connecting the flat plate portions;
Have
  The thickness of the corner portion is smaller than the thickness of the flat plate portion,
Cell stack device.
  Manifold,
  Fuel cells extending upward from the manifold;
  An end current collecting member electrically connected to the fuel cell;
With
  The end current collecting member is
    A joint having a first end and a second end and configured to be joined to the fuel cell;
    A connecting portion extending from the first end of the joint to the second end;
    A drawer portion extending from the distal end portion of the connecting portion and extending away from the joint portion;
Have
  The manifold is disposed on a pedestal;
  The manifold is
    The bottom wall,
    A side wall extending upward from the bottom wall;
    An upper wall that closes the upper end of the side wall and to which the fuel cell is joined;
    A plurality of protrusions attached to the bottom wall and in contact with the pedestal;
Have
  The protrusion is made of a material different from the material forming the bottom wall.
Cell stack device.

Images