JP6452766B1 - Manifold and cell stack device - Google Patents

Abstract

To improve sealing performance by a bonding material. A manifold 2 is configured to supply gas to a fuel cell 1. The manifold 2 includes a bottom wall, a side wall, and a top wall 22. The upper wall 22 has a through hole 27 into which one end of the fuel cell 1 is inserted. The inner wall surface 271 that defines the through hole 27 has a main surface 271 a extending along the outer peripheral surface of the fuel cell 1, and a curved surface 271 b that connects the main surface 271 a and the upper surface 222 of the upper wall 22. Yes. [Selection] Figure 9

Description

  The present invention relates to a manifold and a cell stack apparatus.

  The cell stack device includes a manifold and a plurality of fuel cells. The manifold is configured to supply gas to each fuel cell. Specifically, the manifold has a bottom wall, a side wall, and a top wall. The bottom wall, the side wall, and the top wall define an internal space of the manifold.

Japanese Patent Laying-Open No. 2015-76339

  Each fuel cell is inserted into an insertion hole formed in the upper wall. Each fuel cell is joined to the upper wall by a joining material. This bonding material also has a function of sealing a gap between the outer peripheral surface of the fuel cell and the inner wall surface of the through hole. Sealing this gap with a bonding material is important from the viewpoint of preventing leakage of fuel gas.

  The subject of this invention is improving the sealing performance by a joining material.

  A manifold according to an aspect of the present invention is configured to supply gas to a fuel cell. The manifold includes a bottom wall, a side wall, and a top wall. The upper wall has at least one through hole into which one end of the fuel cell is inserted. The inner wall surface that defines the through hole has a main surface that extends along the outer peripheral surface of the fuel cell, and a curved surface that connects the main surface and the upper surface of the upper wall.

  According to this configuration, the upper end portion of the inner wall surface of the through hole is configured by the curved surface. For this reason, the joining material applied so as to join the fuel cell and the top plate easily flows into the gap between the outer peripheral surface of the fuel cell and the inner wall surface of the through hole along the curved surface. As a result, the gap between the outer peripheral surface of the fuel cell and the inner wall surface of the through hole can be easily filled with the bonding material, and the sealing performance by the bonding material can be improved.

  Preferably, the upper wall further has a protrusion that protrudes downward from the periphery of the through hole. According to this configuration, the area of the inner wall surface is increased by the amount of the protruding portion, so that the sealing performance by the bonding material can be further improved.

  Preferably, the upper wall has a plurality of through holes. In this case, each through hole is preferably configured such that one fuel cell is inserted.

  Preferably, the curved surface extends over the entire circumference of the through hole.

  A cell stack device according to a second aspect of the present invention includes any one of the manifolds described above, a fuel cell in which one end is inserted into the through hole, and a first joint that joins the fuel cell and the upper wall. Material.

  According to the present invention, the sealing performance by the bonding material can be improved.

The perspective view of a cell stack apparatus. Sectional drawing of a cell stack apparatus. III-III sectional view taken on the line of FIG. FIG. 4 is a sectional view taken along line IV-IV in FIG. 2. The expanded sectional view of a manifold. FIG. 6 is a sectional view taken along line VI-VI in FIG. 3. The expanded sectional view of a manifold. The top view of an upper wall. The expanded sectional view of a manifold. The perspective view of a fuel cell. Sectional drawing of a fuel cell. The expanded sectional view of a cell stack device. Sectional drawing of the manifold which concerns on a modification. The expanded sectional view of the manifold which concerns on a modification.

[Cell stack equipment]
Hereinafter, embodiments of a manifold and a cell stack device according to the present invention will be described with reference to the drawings. As shown in FIGS. 1 to 3, the cell stack device 100 includes a plurality of fuel cells 1, a manifold 2, and a first bonding material 3 (an example of the bonding material of the present invention).

[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 introduced into 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 body 21 and an upper wall 22. 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 substantially rectangular parallelepiped shape and has an internal space whose upper surface is open. Specifically, the manifold body 21 has a frustum shape. The manifold main body 21 has a bottom wall 23, a pair of first side walls 24, and a pair of second side walls 25. The manifold body 21 may have a flange portion 26.

  The bottom wall 23 has a rectangular shape in plan view (viewed in the x-axis direction). Each first side wall 24 and each second side wall 25 extend upward from the peripheral edge of the bottom wall 23. The pair of first side walls 24 are arranged to face each other in the depth direction (z-axis direction) of the internal space of the manifold 2. The pair of second side walls 25 are disposed so as to face each other in the width direction (y-axis direction) of the internal space of the manifold 2.

  As shown in FIGS. 4 and 5, the first side wall 24 and the second side wall 25 are inclined so as to spread outward. Although not particularly limited, for example, the angle α formed by the first side wall 24 and the second side wall 25 and the bottom wall 23 can be about 90.1 to 135 °. Since the first side wall 24 and the second side wall 25 are inclined as described above, the cross-sectional area obtained by cutting the internal space of the manifold 2 along a plane parallel to the bottom wall 23 (yz plane) increases as it goes upward. Further, a cross section obtained by cutting the internal space of the manifold 2 with a plane (xy plane) perpendicular to the bottom wall 23 and extending in the width direction (y-axis direction) has a trapezoidal shape. Further, a cross section obtained by cutting the internal space of the manifold 2 with a surface (xz plane) perpendicular to the bottom wall 23 and extending in the depth direction (z-axis direction) has a trapezoidal shape.

  One first side wall 24 of the pair of first side walls 24 has a gas inlet 241. An introduction pipe 201 is attached to the first side wall 24 in which the gas introduction port 241 is formed. For example, as shown in FIG. 5, the introduction tube 201 is in contact with the outer surface of the first side wall 24. The flow path of the introduction pipe 201 and the gas introduction port 241 communicate with each other. The introduction pipe 201 may not be attached in parallel to the bottom wall 23. The gas inlet 241 is preferably formed at the center in the width direction (y-axis direction) of the first side wall 24. Gas is introduced into the internal space of the manifold 2 from the gas inlet 241.

  The flange portion 26 extends outward from the upper end portions of the first side walls 24 and the second side walls 25. The flange portion 26 is annular.

The manifold body 21 is composed of one member. That is, the bottom wall 23, each 1st side wall 24, each 2nd side wall 25, and each flange part 26 are comprised by one member. 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). , MgO · SiO ₂ (steatite), and 2MgO · SiO ₂ (forsterite).

  As shown in FIG. 6, the inner side surface and the outer side surface of the first boundary portion 20a between the first side wall 24 and the second side wall 25 are R-shaped. The curvature radius of the inner surface of the first boundary portion 20a can be about 3 to 30 mm. The inner side surface of the first boundary portion 20 a is a surface that faces the internal space of the manifold 2, and the outer side surface is a surface that faces the outside of the manifold 2.

  As shown in FIG.4 and FIG.7, the inner surface and the outer surface of the 2nd boundary part 20b of the bottom wall 23 and the 1st side wall 24 and the 2nd side wall 25 are R shape. The radius of curvature of the inner surface of the second boundary portion 20b can be about 2 to 20 mm. The inner side surface of the second boundary portion 20 b is a surface facing the internal space of the manifold 2, and the outer surface is a surface facing the outside of the manifold 2.

  The inner side surface and the outer side surface of the third boundary portion 20c between the first side wall 24 and the second side wall 25 and the flange portion 26 have an R shape. The curvature radius of the inner surface of the third boundary portion 20c can be about 1 to 10 mm. The inner side surface of the third boundary portion 20 c is a surface that faces the internal space of the manifold 2, and the outer side surface is a surface that faces the outside of the manifold 2.

  As shown in FIG. 7, a gap 28 is formed between the third boundary portion 20 c and the upper wall 22 in the height direction (x-axis direction) of the internal space of the manifold 2. That is, the lower surface of the upper wall 22 and the upper surface of the flange portion 26 are in contact with each other, while the lower surface of the upper wall 22 and the inner surface of the third boundary portion 20c are not in contact with each other. The gap 28 is formed over the entire circumference.

  As shown in FIG. 4, the upper wall 22 is disposed on the manifold body 21 so as to close the upper surface of the manifold body 21. Specifically, the upper wall 22 is fixed to the flange portion 26. In order to seal the internal space of the manifold 2, the upper wall 22 is joined to the manifold body 21 over the entire circumference. For example, the upper wall 22 and the manifold body 21 are joined by a joining material or welding. The upper wall 22 can be formed from at least one of the materials of the manifold body 21 described above.

  As shown in FIG. 8, 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. Further, the through holes 27 are arranged at intervals in the depth direction (z-axis direction) of the manifold 2. The lower end of the fuel cell 1 is inserted into the through hole 27. One fuel cell 1 is inserted into each through-hole 27. That is, only one fuel cell 1 is inserted into one through hole 27.

  As shown in FIG. 9, the inner wall surface 271 that defines the through hole 27 has a main surface 271a and a curved surface 271b. The main surface 271a extends along the outer peripheral surface of the fuel cell 1. Specifically, the main surface 271a extends vertically. The main surface 271a may be inclined. For example, the main surface 271a may be inclined so as to approach the fuel cell 1 downward.

  The curved surface 271b connects the upper surface 222 of the upper wall 22 and the main surface 271a. The upper surface 222, the curved surface 271b, and the main surface 271a are continuous with each other. The curved surface 271 b extends over the entire circumference of the through hole 27. That is, the curved surface 271b is formed in an annular shape. The curved surface 271b faces upward and also faces the fuel cell 1. The curvature radius of the curved surface 271b can be, for example, about 0.1 to 3.0 mm. The curved surface 271b is curved away from the fuel cell 1 as it goes upward.

  The upper wall 22 has a protrusion 221. The protruding portion 221 protrudes downward from the peripheral portion of the through hole 27. The thickness t of the protruding portion 221 is, for example, about 0.3 to 2.0 mm. Moreover, the height H of the protrusion part 221 is about 0.05-2.0 mm. The height H of the protrusion 221 is a dimension from the lower surface of the upper wall 22 to the tip of the protrusion 221. The protrusion 221 can be formed by, for example, burring. The protrusion 221 may extend vertically or may be inclined so as to approach the fuel cell 1 downward.

[Fuel battery cell]
As shown in FIGS. 1 to 3, each fuel cell 1 is attached to a manifold 2. 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 101 of the fuel cell 1 is inserted into the through hole 27. The length of the fuel cell 1 in the longitudinal direction (x-axis direction) can be about 100 to 300 mm. In the state where the lower end portion 101 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 101 of the fuel cell 1 and the inner wall surface 271 of the through hole 27. ing. This gap is filled with the first bonding material 3 (see FIG. 9).

  The fuel cells 1 are arranged at intervals in the depth direction (z-axis direction) of the manifold 2. In FIG. 1, the fuel cells 1 are arranged in one row, but the fuel cells 1 may be arranged in a plurality of rows. The number of fuel cells 1 is about 1 to 50 per row. Each fuel cell 1 is arranged such that each main surface faces the depth direction (z-axis direction). The fuel cells 1 are electrically connected to each other via the first current collecting member 4. The first current collecting member 4 is disposed between the fuel cells 1 and connects the adjacent fuel cells 1. The first current collecting member 4 is joined to each fuel cell 1 by a second joining material 5. The first current collecting member 4 is formed from a conductive material. For example, the first current collecting member 4 is formed of a sintered body of oxide ceramics or a metal.

  As shown in FIG. 10, the fuel cell 1 includes a plurality of power generation element portions 11 and a support substrate 12. 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 at intervals in the longitudinal direction of the fuel battery cell 1. That is, the fuel cell 1 according to the present embodiment is a so-called horizontal stripe type fuel cell.

  The power generating element portions 11 are electrically connected to each other by an electrical connection portion 17 (see FIG. 11). Further, on the upper end portion 102 side of the 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 are the second current collecting member 6 (see FIG. 2). ) Is electrically connected. Each power generating element unit 11 is connected in series.

As shown in FIG. 3, the support substrate 12 has a plurality of gas flow passages 121 extending in the longitudinal direction (x-axis direction) of the support substrate 12 inside. The gas flow path 121 communicates with the internal space of the manifold 2. The gas flow paths 121 are arranged at intervals from each other in the width direction (y-axis direction) of the support substrate 12. That is, the gas flow paths 121 are arranged at intervals from each other in the width direction (y-axis direction) of the manifold 2. The area of each gas channel 121 can be about 0.1 to 30 mm 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. 11, 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%.

  Each power generation element unit 11 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 in the longitudinal direction from one interconnector 171 to the next interconnector 171. That is, the electrolyte 14 and the interconnector 171 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 is disposed on the reaction preventing film 16. The air electrode 15 is a fired body made of a porous material having electron conductivity. The air electrode 15 can be made of, for example, LSCF = (La, Sr) (Co, Fe) O ₃ (lanthanum strontium cobalt ferrite). Alternatively, the air electrode 15 has 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 15 may be composed of two layers of a first layer (inner layer) made of LSCF and a second layer (outer layer) made of LSC. The thickness of the air electrode 15 is, for example, 10 to 100 μm.

The electrical connection portion 17 is configured to electrically connect adjacent power generation element portions 11. The electrical connection unit 17 includes an interconnector 171 and an air electrode current collector 172. The interconnector 171 is disposed in the third recess 131b. Specifically, the interconnector 171 is embedded (filled) in the third recess 131b. The interconnector 171 is a fired body composed of a dense material having electronic conductivity. The interconnector 171 can be composed of, for example, LaCrO ₃ (lanthanum chromite). Alternatively, the interconnector 171 may be made of (Sr, La) TiO ₃ (strontium titanate). The thickness of the interconnector 171 is, for example, 10 to 100 μm.

  Air electrode current collector 172 is arranged to extend between interconnector 171 and air electrode 15. For example, the air electrode current collector 172 is disposed so as to electrically connect the air electrode 15 of the power generation element unit 11 disposed on the left side of FIG. 11 and the interconnector 171. The air electrode current collector 172 is a fired body made of a porous material having electronic conductivity.

The air electrode current collector 172 can be made of, for example, LSCF = (La, Sr) (Co, Fe) O ₃ (lanthanum strontium cobalt ferrite). Alternatively, the air electrode current collector 172 may be made of LSC = (La, Sr) CoO ₃ (lanthanum strontium cobaltite). Or the air electrode current collection part 172 may be comprised from Ag (silver) and Ag-Pd (silver palladium alloy). The thickness of the air electrode current collector 172 is, for example, about 50 to 500 μm.

  As shown in FIG. 12, the lower end portion 101 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 air electrode current collector 172 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 interconnector 171 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 air electrode current collector 172. 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.

[First bonding material]
As shown in FIG. 9, the first joining material 3 joins the first fuel cell 1 and the manifold 2. Specifically, the first bonding material 3 joins the first fuel cell 1 and the upper wall 22 of the manifold 2. The first bonding material 3 is formed in an annular shape along the outer peripheral edge of the through hole 27 of the upper wall 22. The first bonding material 3 is filled in a gap between the outer peripheral surface of the first fuel cell 1 and the inner wall surface 271 of the through hole 27 and fills this gap. That is, the first bonding material 3 seals this gap so as to prevent gas from leaking from the gap between the outer peripheral surface of the first fuel cell 1 and the inner wall surface 271 of the through hole 27. The first bonding material 3 is in contact with the dense film 18.

The first bonding material 3 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%. Note that amorphous glass, brazing material, ceramics, or the like may be employed as the material of the first bonding material 3. Specifically, the first bonding material 3 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. .

  The first bonding material 3 is coated with an amorphous material (amorphous glass) paste so as to fill a gap between the outer peripheral surface of the first fuel cell 1 and the inner wall surface 271 of the through hole 27. It is formed by applying heat treatment. When the temperature of the amorphous material reaches its crystallization temperature by this heat treatment, a crystal phase is generated inside the material at the crystallization temperature, and crystallization proceeds. As a result, the amorphous material is solidified and ceramicized to become crystallized glass. Thereby, the 1st joining material 3 comprised with crystallized glass is formed. In addition, since the upper end part of the inner wall surface 271 of the through-hole 27 is comprised by the curved surface 271b, the 1st joining material 3 apply | coated as mentioned above tends to flow in the said clearance along the curved surface 271b.

[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 the cell stack device 100 is connected to an external load, an electrochemical reaction represented by the following formula (1) occurs in the air electrode 15, and an electrochemical reaction represented by the following formula (2) occurs in the fuel electrode 13, causing current to flow. .
(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 fuel battery cell 1 is a horizontal stripe type having a plurality of power generation element portions 11. However, the fuel battery cell 1 is a vertical stripe type having a single power generation element portion extending in the longitudinal direction. It may be. Further, the fuel cell 1 may be a horizontal stripe cylindrical type.

Modification 2
In the said embodiment, although the 1st side wall 24 and the 2nd side wall 25 incline so that it may spread outward toward the upper direction, the 1st side wall 24 and the 2nd side wall 25 do not need to incline. .

Modification 3
In the above embodiment, the bottom wall 23, the pair of first side walls 24, and the pair of second side walls 25 constitute the manifold body 21, but the configuration of the manifold 2 is not limited to this.

  For example, as shown in FIG. 13, in the manifold 2, the upper wall 22, the pair of first side walls 24, and the pair of second side walls 25 constitute the manifold body 21, and the bottom wall 23 is the manifold body 21. You may be comprised so that a lower surface may be sealed. The manifold 2 may have a second flange portion 29 instead of the first flange portion 26. The second flange portion 29 extends outward from the lower end portions of the first side wall 24 and the second side wall 25.

  The inner side surface and the outer side surface of the fourth boundary portion 20d between the upper wall 22, the first side wall 24, and the second side wall 25 have an R shape. The radius of curvature of the inner surface of the fourth boundary portion 20d can be about 2 to 20 mm. The inner side surface of the fourth boundary portion 20 d is a surface facing the internal space of the manifold 2, and the outer side surface is a surface facing the outside of the manifold 2.

  The inner side surface and the outer side surface of the fifth boundary portion 20e between the first side wall 24 and the second side wall 25 and the second flange portion 29 are R-shaped. The radius of curvature of the inner surface of the fifth boundary portion 20e can be about 1 to 10 mm. The inner side surface of the fifth boundary portion 20e is a surface facing the internal space of the manifold 2, and the outer side surface is a surface facing the outside of the manifold 2.

  As shown in FIG. 14, a second gap 30 is formed between the fifth boundary 20 e and the bottom wall 23 in the height direction (x-axis direction) of the internal space of the manifold 2. That is, while the upper surface of the bottom wall 23 and the lower surface of the second flange portion 29 are in contact, the upper surface of the bottom wall 23 and the inner surface of the fifth boundary portion 20e are not in contact. The second gap 30 is formed over the entire circumference.

  As shown in FIG. 13, the bottom wall 23 is fixed to the second flange portion 29 so as to close the lower surface of the manifold 2. In order to seal the internal space of the manifold 2, the bottom wall 23 is joined to the second flange portion 29 over the entire circumference. For example, the bottom wall 23 and the second flange portion 29 are joined by welding or a joining material.

Modification 9
In the said embodiment, although the lower end part of the support substrate 12 of the fuel cell 1 is inserted in the insertion hole 27, the structure of the fuel cell 1 is not limited to this. For example, the fuel cell 1 may further include a member attached to the lower end portion of the support substrate 12, and the member may be inserted into the insertion hole 27.

DESCRIPTION OF SYMBOLS 1 Fuel cell 2 Manifold 22 Upper wall 23 Bottom wall 24 1st side wall 25 2nd side wall 27 Through-hole 271 Inner wall surface 271a Main surface 271b Curved surface

Claims (5)

With fuel cells
A manifold for supplying gas to the fuel cell,
A first bonding material for bonding the fuel cell and the manifold;
With
The manifold includes a bottom wall, a side wall, and a top wall,
The upper wall has at least one through hole into which one end of the fuel cell is inserted,
The inner wall surface defining a through hole, possess a principal surface extending along the outer circumferential surface of the fuel cell, and a curved surface connecting the upper surface of the main surface and the upper wall, a,
One end of the fuel cell is inserted into the through hole,
The first joining material joins the fuel cell and the upper wall,
A gap is formed between the outer peripheral surface of the fuel cell and the main surface of the through hole,
The first bonding material is filled in the gap.
Cell stack device.
The upper wall further has a protruding portion that protrudes downward from a peripheral portion of the through hole.
The cell stack device according to claim 1.
The upper wall has a plurality of the through holes,
The cell stack apparatus according to claim 1 or 2.
Each of the through holes is configured such that the fuel cells are inserted one by one.
The cell stack device according to claim 3.
The curved surface extends over the entire circumference of the through-hole,
The cell stack device according to claim 1.

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