Fluid container and electrochemical cell

Abstract

A fluid container (3) is provided with a first metal member (31), a second metal member (32), and an adhesive section (34). The first and second metal members (31, 32) contain chromium. The adhesive section (34) is configured from an oxide having chromium as the main component. The adhesive section (34) adheres the first metal member (31) and the second metal member (32) to each other. The adhesive section (34) has a base section (341) and a convex section (342). The protruding portion (342) protrudes from the base portion (341) in the thickness direction.

Description

Technical Field

[0001] This invention relates to fluid containers and electrochemical single cells. Background Technology

[0002] Electrochemical single cells, such as electrolytic single cells and fuel cell single cells, have a fluid container to supply fluid to their main body. For example, the fluid container disclosed in Patent Document 1 includes: a first interconnector, a second interconnector, a separator, a fuel electrode frame, and a glass seal.

[0003] The first interconnect is connected to the air electrode of the fuel cell. The second interconnect is connected to the fuel electrode current collector of the fuel cell. A separator is connected to the solid electrolyte of the fuel cell, separating the flow paths of fuel gas and oxidant gas. A fuel electrode frame is disposed between the separator and the second interconnect. A glass seal bonds the first interconnect and the separator.

[0004] Existing technical documents

[0005] Patent documents

[0006] Patent Document 1: Japanese Patent Application Publication No. 2015-156352 Summary of the Invention

[0007] In the fluid container described above, a first metal component and a second metal component are bonded together using an adhesive joint. It is possible that cracks may form within this adhesive joint, leading to the joint's failure as the cracks progress.

[0008] The objective of this invention is to provide a fluid container and an electrochemical single cell capable of suppressing damage to the adhesive portion.

[0009] The fluid container of the first embodiment includes: a first metal component, a second metal component, and an adhesive portion. Both the first and second metal components contain chromium. The adhesive portion is composed of an oxide primarily composed of chromium. The adhesive portion bonds the first and second metal components together. The adhesive portion has a base and a protrusion. The protrusion extends from the base along the thickness direction.

[0010] According to this configuration, the adhesive portion is clamped by a first metal component and a second metal component, thus generating localized compressive stress in the region where the protrusion is formed in the adhesive portion. As a result, even if cracks occur in the adhesive portion, the propagation of the cracks can be suppressed in the region where localized compressive stress is generated, thereby preventing damage to the adhesive portion.

[0011] The fluid container in the second embodiment is constructed based on the fluid container in the first embodiment as follows: The protrusion is made of a different material than the base.

[0012] The fluid container in the third embodiment is constructed based on the fluid container in the first embodiment as follows: The protrusion is made of the same material as the base.

[0013] The fourth embodiment of the fluid container, based on the fluid container of any of the first to third embodiments, further includes: an internal space for fluid flow. The adhesive portion extends in a ring shape to surround the internal space. The adhesive portion has multiple protrusions. These protrusions are arranged along the outer periphery of the first metal component.

[0014] The fluid container in the fifth embodiment, based on the fluid containers in any of the first to fourth embodiments, further includes: an internal space for fluid flow. The adhesive portion has multiple protrusions. The protrusions are arranged from the internal space toward the outer periphery of the first metal component.

[0015] The fluid container involved in the sixth embodiment is constructed based on the fluid container involved in any of the first to fifth embodiments, as follows: The ratio (t2 / t1) of the thickness of the thickest part of the adhesive portion to the thickness of the thinnest part of the adhesive portion is 1.2 or more.

[0016] The fluid container of the seventh embodiment, in addition to the fluid container of any of the first to sixth embodiments, further includes: an internal space for fluid flow. The adhesive portion has a thick portion that is thicker than its average thickness. In the direction from the internal space toward the outer periphery of the first metal member, the ratio (L / L0) of the length (L) of the thick portion to the length (L0) of the adhesive portion is 0.4 or less.

[0017] The fluid container in the eighth embodiment, in addition to the fluid containers in any of the first to seventh embodiments, also includes: an internal space for fluid flow. The adhesive part is a seal used to close the internal space.

[0018] The electrochemical single cell involved in the ninth embodiment includes: a fluid container involved in any of the first to eighth embodiments, and a single cell body disposed on the fluid container.

[0019] The electrochemical single cell of the tenth embodiment is constructed as follows, based on the electrochemical single cell of the ninth embodiment: The fluid container has an internal space for fluid flow. The first metal component has multiple connecting holes connected to the internal space. The main body of the single cell is disposed on the first metal component in a manner that covers the multiple connecting holes.

[0020] The electrochemical single cell in the eleventh embodiment is constructed based on the electrochemical single cell in the ninth embodiment as follows: The fluid container has an internal space for fluid flow. The second metal component has multiple connecting holes connected to the internal space. The main body of the single cell is disposed on the second metal component in a manner that covers the multiple connecting holes.

[0021] Invention Effects

[0022] According to the present invention, damage to the adhesive portion can be suppressed. Attached Figure Description

[0023] Figure 1 It is a plan view of an electrolytic single cell.

[0024] Figure 2 yes Figure 1 Sectional view of line II-II.

[0025] Figure 3 This is an enlarged cross-sectional view centered on the first adhesive part.

[0026] Figure 4 It is a plan view of a fluid container.

[0027] Figure 5 This is an example of a captured image.

[0028] Figure 6 This is an enlarged cross-sectional view centered on the first adhesive part of the modified example. Detailed Implementation

[0029] <Electrolytic Single Cell>

[0030] Figure 1 This is a plan view of an electrolytic single cell 100. Figure 2 yes Figure 1 Sectional view of line II-II.

[0031] like Figure 1 As shown, the electrolytic cell 100 (an example of an electrochemical cell) is formed as a plate extending along the X-axis and Y-axis directions. In this embodiment, the electrolytic cell 100 is formed as a rectangle extending along the Y-axis direction when viewed from above along the Z-axis direction, which is perpendicular to the X-axis and Y-axis directions. However, the planar shape of the electrolytic cell 100 is not particularly limited and can be a polygon, ellipse, circle, etc., other than a rectangle.

[0032] like Figure 1 and Figure 2 As shown, the electrolytic single cell 100 includes a single cell body 2 and a fluid container 3.

[0033] <Single Battery Main Body>

[0034] The single-cell main body 2 is disposed on the fluid container 3. The single-cell main body 2 is supported by the metal support 31 described later in the fluid container 3. The single-cell main body 2 is disposed on the metal support 31 in such a way that it covers the plurality of through holes 313 described later. The single-cell main body 2 has: a hydrogen electrode 21 (cathode), an electrolyte 22, an anti-reaction layer 23, and an oxygen electrode 24 (anode).

[0035] The hydrogen electrode 21, electrolyte 22, anti-reaction layer 23, and oxygen electrode 24 are stacked sequentially in the Z-axis direction, starting from the side of the fluid container 3. The hydrogen electrode 21, electrolyte 22, and oxygen electrode 24 are mandatory components, while the anti-reaction layer 23 is optional.

[0036] <Hydrogen Pole>

[0037] The hydrogen electrode 21 is disposed on the first main surface 311 of the metal support 31. Feed gas is supplied to the hydrogen electrode 21 through the connecting holes 313 of the metal support 31. The feed gas contains at least water vapor (H2O). H2 is generated at the hydrogen electrode 21 during the electrolysis reaction.

[0038] When the feed gas contains only H2O, the hydrogen electrode 21 generates H2 from the feed gas according to the electrochemical reaction of water electrolysis shown in equation (1) below.

[0039] • Hydrogen pole 21: H2O + 2e － →H2+O 2－ ···(1)

[0040] When the feed gas contains H2O and CO2, the hydrogen electrode 21 generates H2, CO and O from the feed gas through a co-electrolysis electrochemical reaction as shown in equations (2), (3), and (4) below. 2－ .

[0041] • Hydrogen pole 21: CO2 + H2O + 4e － →CO + H₂ + 2O 2－ ···(2)

[0042] Electrochemical reaction of H2O: H2O + 2e － →H2+O 2－ ···(3)

[0043] • Electrochemical reaction of CO2: CO2 + 2e － →CO+O 2－ ···(4)

[0044] The H2 generated at the hydrogen electrode 21 flows out from the connecting holes 313 of the metal support 31 into the internal space 30, which will be described later.

[0045] The hydrogen electrode 21 is a porous material with electronic conductivity. The hydrogen electrode 21 contains nickel (Ni). In co-electrolysis, Ni functions as an electron conductor and also as a thermal catalyst, promoting the thermal reaction between the generated H2 and the CO2 contained in the feed gas while maintaining a suitable gas composition for metallization, Fischer-Tropsch synthesis, etc. The Ni contained in the hydrogen electrode 21 exists primarily as metallic Ni during the operation of the electrolytic cell 100; however, a portion may exist as nickel oxide (NiO).

[0046] Hydrogen electrode 21 may contain ion-conducting materials. Examples of ion-conducting materials that can be used include: yttrium-stabilized zirconium oxide (YSZ), calcium oxide-stabilized zirconium oxide (CSZ), scandium oxide-stabilized zirconium oxide (ScSZ), gadolinium-doped cerium dioxide (GDC), samarium-doped cerium dioxide (SDC), (La,Sr)(Cr,Mn)O3, (La,Sr)TiO3, Sr2(Fe,Mo)2O6, (La,Sr)VO3, (La,Sr)FeO3, and mixed materials obtained by combining two or more of these materials.

[0047] The thickness of the hydrogen electrode 21 is not particularly limited; for example, it can be greater than 1 μm and less than 100 μm. The coefficient of thermal expansion of the hydrogen electrode 21 is not particularly limited; it can be, for example, 12 × 10⁻⁶. ―6 / ℃ or above and 20×10 －6 / ℃ below.

[0048] There are no particular restrictions on the formation method of the hydrogen electrode 21. It can be formed by: firing method, spraying method (fusion deposition method, aerosol deposition method, aerosol gas deposition method, powder jet deposition method, particle jet deposition method, cold spraying method, etc.), PVD method (sputtering method, pulsed laser deposition method, etc.), CVD method, etc.

[0049] <Electrolytes>

[0050] Electrolyte 22 is formed on hydrogen electrode 21. Electrolyte 22 is disposed between hydrogen electrode 21 and oxygen electrode 24. In this embodiment, electrolyte 22 is sandwiched between hydrogen electrode 21 and anti-reaction layer 23, and is connected to both.

[0051] Electrolyte 22 covers hydrogen electrode 21 and also covers the area of ​​the first main surface 311 of metal support 31 exposed from hydrogen electrode 21.

[0052] Electrolyte 22 is a dense body with oxide ion conductivity. Electrolyte 22 is used to convert the O generated at hydrogen electrode 21... 2－It is transferred to the oxygen electrode 24 side. The electrolyte 22 is made of an oxide ion-conducting material. The electrolyte 22 can be made of, for example, YSZ, GDC, ScSZ, SDC, LSGM (lanthanum gallate), etc., and YSZ is particularly preferred.

[0053] The thickness of electrolyte 22 is not particularly limited; for example, it can be greater than 1 μm and less than 100 μm. The coefficient of thermal expansion of electrolyte 22 is not particularly limited; for example, it can be 10 × 10⁻⁶. ―6 / ℃ or higher and 12×10 ―6 / ℃ below.

[0054] There are no particular restrictions on the formation method of electrolyte 22, and methods such as sintering, spraying, PVD, and CVD can be used.

[0055] <Anti-reaction layer>

[0056] An anti-reaction layer 23 is disposed between the electrolyte 22 and the oxygen electrode 24. The anti-reaction layer 23 is disposed on the opposite side of the hydrogen electrode 21, with the electrolyte 22 as a reference. The anti-reaction layer 23 is used to suppress the formation of a layer with high electrical resistance due to the reaction between the constituent elements of the electrolyte 22 and the constituent elements of the oxygen electrode 24.

[0057] The anti-reaction layer 23 is made of an oxide ion-conducting material. The anti-reaction layer 23 can be made of GDC, SDC, etc.

[0058] The porosity of the anti-reaction layer 23 is not particularly limited, and can be, for example, 0.1% or more and 50% or less. The thickness of the anti-reaction layer 23 is not particularly limited, and can be, for example, 1 μm or more and 50 μm or less.

[0059] There are no particular restrictions on the method of forming the anti-reaction layer 23; methods such as firing, spraying, PVD, and CVD can be used.

[0060] <Oxygen pole>

[0061] The oxygen electrode 24 is disposed on the opposite side of the hydrogen electrode 21, with the electrolyte 22 as a reference. In this embodiment, an anti-reaction layer 23 is disposed between the electrolyte 22 and the oxygen electrode 24, therefore, the oxygen electrode 24 is connected to the anti-reaction layer 23. If the anti-reaction layer 23 is not disposed between the electrolyte 22 and the oxygen electrode 24, the oxygen electrode 24 is connected to the electrolyte 22.

[0062] Oxygen electrode 24 undergoes a chemical reaction according to the following equation (5), where O is transferred from hydrogen electrode 21 through electrolyte 22. 2－ O2 is generated.

[0063] ·Oxygen pole 24:2O 2－ →O2+4e － ···(5)

[0064] The oxygen electrode 24 is a porous material with oxide ion conductivity and electronic conductivity. The oxygen electrode 24 can be composed of a composite material of one or more of the following: (La,Sr)(Co,Fe)O3, (La,Sr)FeO3, La(Ni,Fe)O3, (La,Sr)CoO3, and (Sm,Sr)CoO3 with an oxide ion conductivity material (GDC, etc.).

[0065] There are no particular limitations on the porosity of the oxygen electrode 24, which can be, for example, 20% or more and 60% or less. There are no particular limitations on the thickness of the oxygen electrode 24, which can be, for example, 1 μm or more and 100 μm or less.

[0066] There are no particular restrictions on the formation method of oxygen electrode 24, and it can be formed by: firing method, spraying method, PVD method, CVD method, etc.

[0067] <Fluid container>

[0068] like Figure 2 As shown, the fluid container 3 has an internal space 30. The raw material gas supplied to the hydrogen electrode 21 and the reducing gas generated at the hydrogen electrode 21 (H2 in this embodiment) flow into the internal space 30. It should be noted that the raw material gas and the reducing gas are examples of the fluids of the present invention.

[0069] The fluid container 3 includes: a metal support 31 (an example of a first metal component), a frame 32 (an example of a second metal component), an interconnector 33, a first adhesive portion 34 (an example of an adhesive portion), and a second adhesive portion 35. The internal space 30 is the space surrounded by the metal support 31, the frame 32, the interconnector 33, the first adhesive portion 34, and the second adhesive portion 35.

[0070] <Metal Support>

[0071] like Figure 2 As shown, the metal support 31 supports the main body 2 of the single battery. In this embodiment, the metal support 31 is formed in the shape of a plate. The metal support 31 is only required to support the main body 2 of the single battery, and its thickness is not particularly limited. For example, it can be 0.1 mm or more and 2.0 mm or less.

[0072] The metal support 31 has: multiple connecting holes 313, a first main surface 311 and a second main surface 312.

[0073] Each connecting hole 313 extends from the first main surface 311 to the second main surface 312 through the metal support 31. Each connecting hole 313 is open on both the first main surface 311 and the second main surface 312. Each connecting hole 313 is covered by the single cell body 2. Specifically, the opening on the first main surface 311 side of each connecting hole 313 is covered by the hydrogen electrode 21. The opening on the second main surface 312 side of each connecting hole 313 is connected to the internal space 30.

[0074] Each connecting hole 313 can be formed by machining (e.g., punching), laser processing, or chemical processing (e.g., etching).

[0075] In this embodiment, each connecting hole 313 is formed in a straight line along the Z-axis direction. However, each connecting hole 313 may be inclined relative to the Z-axis direction, or it may not be straight. In addition, the connecting holes 313 may be connected to each other.

[0076] The first main surface 311 is located on the opposite side of the second main surface 312. A single battery body 2 is disposed on the first main surface 311. A frame 32 is joined to the second main surface 312 by means of a first adhesive part 34.

[0077] The metal support 31 is made of an alloy containing Cr (chromium). Examples of such alloys include Fe-Cr alloy steels (stainless steel, etc.) and Ni-Cr alloy steels. There is no particular limitation on the Cr content in the metal support 31, which can be 4% by mass or more and 30% by mass or less.

[0078] The metal support 31 may contain Ti (titanium) or Zr (zirconium). There is no particular limitation on the Ti content in the metal support 31; it can be above 0.01 mol% and below 1.0 mol%. There is no particular limitation on the Zr content in the metal support 31; it can be above 0.01 mol% and below 0.4 mol%. The metal support 31 may contain Ti in the form of TiO2 (titanium dioxide) or Zr in the form of ZrO2 (zirconium oxide).

[0079] <Frame>

[0080] The frame 32 serves as a bushing for forming the internal space 30. The frame 32 is formed in a ring shape in top view (Z-axis view). The frame 32 is joined to the metal support 31 by means of a first adhesive portion 34, and to the interconnect 33 by means of a second adhesive portion 35. The thickness of the frame 32 is not particularly limited and can be, for example, 0.1 mm or more and 2.0 mm or less.

[0081] The frame 32 has a first main surface 321 and a second main surface 322. The first main surface 321 of the frame 32 is the surface facing the metal support 31. The second main surface 322 of the frame 32 is the surface facing the interconnector 33.

[0082] The frame 32 is made of an alloy containing Cr. Examples of such alloys include Fe-Cr alloy steel and Ni-Cr alloy steel. There is no particular limitation on the Cr content in the frame 32; it can be 4% by mass or more and 30% by mass or less. The composition of the frame 32 can be the same as or different from that of the metal support 31.

[0083] <Interconnector>

[0084] The interconnector 33 is disposed on the opposite side of the metal support 31 with reference to the frame 32. The interconnector 33 is a component for electrically connecting the electrolytic cell 100 to an external power source or other electrolytic cells.

[0085] The interconnect 33 is formed in the shape of a plate. The interconnect 33 is attached to the frame 32 by means of the second adhesive portion 35. The thickness of the interconnect 33 is not particularly limited and can be, for example, more than 0.1 mm and less than 2.0 mm.

[0086] The interconnect 33 is made of a Cr-containing alloy. Examples of such alloys include Fe-Cr alloy steel and Ni-Cr alloy steel. The Cr content in the interconnect 33 is not particularly limited and can be between 4% and 30% by mass. The composition of the interconnect 33 can be the same as or different from that of the metal support 31. The composition of the interconnect 33 can be the same as or different from that of the frame 32.

[0087] <First Adhesive Part>

[0088] The first adhesive portion 34 is disposed between the metal support 31 and the frame 32. The first adhesive portion 34 bonds the metal support 31 and the frame 32. Specifically, the first adhesive portion 34 is engaged with both the metal support 31 and the frame 32.

[0089] The first adhesive portion 34 seals the gap between the metal support 31 and the frame 32. This prevents the raw material gas supplied to the hydrogen electrode 21 and the reducing gas generated at the hydrogen electrode 21 from leaking to the outside through the gap between the metal support 31 and the frame 32.

[0090] The first adhesive portion 34 is disposed between the metal support 31 and the frame 32. The first adhesive portion 34 is held between the metal support 31 and the frame 32. The first adhesive portion 34 extends in a ring shape to surround the internal space 30. The first adhesive portion 34 functions as a seal to close the internal space 30. That is, the first adhesive portion 34 extends continuously in a ring shape.

[0091] The first adhesive portion 34 is composed of an oxide with Cr as its main component (hereinafter referred to as "Cr oxide"). Accordingly, during the manufacture or operation of the electrolytic cell 100, the diffusion of Cr from the metal support 31 and the frame 32 to the first adhesive portion 34 can be suppressed. Furthermore, even if Cr diffuses from the metal support 31 and the frame 32 to the first adhesive portion 34, the impact on the composition of the first adhesive portion 34 is relatively small; therefore, the reduction in the strength of the first adhesive portion 34 can also be suppressed. In addition, since the metal support 31, the frame 32, and the first adhesive portion 34 all contain Cr, their adhesion to each other can be improved. Accordingly, the adhesion between the metal support 31 and the frame 32 can be maintained for a long period.

[0092] It should be noted that in this embodiment, Cr as the main component means that, when the composition of the Cr oxide constituting the first adhesive part 34 is analyzed using an energy dispersive spectrophotometer (EDS), the Cr content among the metal elements is the highest. There is no particular limitation on the Cr content in the Cr oxide; for example, it can be 20 mol% or more and 100 mol% or less among the metal elements.

[0093] The Cr content in the Cr oxide constituting the first adhesive portion 34 is preferably 50 mol% or more in the metal element. Accordingly, the diffusion of Cr contained in the metal support 31 and the frame 32 into the first adhesive portion 34 can be significantly suppressed.

[0094] The Cr oxide constituting the first adhesive portion 34 is preferably composed of at least one of chromium oxide and chromium-manganese oxide. These oxides have the property that Cr is particularly difficult to diffuse, thus improving the durability of the first adhesive portion 34.

[0095] Examples of chromium oxides include Cr₂O₃. Examples of chromium-manganese oxides include MnCr₂O₄ (spinel) and Mn₂O₃. 1，5 Cr 1，5 O4 (spinel), etc.

[0096] The Cr oxide constituting the first adhesive portion 34 is preferably crystalline. Accordingly, even if the electrolytic cell 100 operates for a long time, damage to the first adhesive portion 34 due to the phase transition of the Cr oxide from amorphous to crystalline can be avoided.

[0097] The Cr oxide constituting the first adhesive portion 34 preferably has a spinel-type or corundum-type crystalline structure. These crystalline structures have high symmetry, thus improving the thermal stress resistance of the first adhesive portion 34.

[0098] The first adhesive portion 34 can be formed as follows: a paste containing Cr oxide is applied to the surface of at least one of the metal support 31 and the frame 32, and then heat treatment is performed to ensure that the metal support 31 and the frame 32 are tightly bonded, thereby forming the first adhesive portion 34. The heat treatment conditions can be appropriately set, for example, 600°C or higher and 1100°C or lower, for 0.5 hours or higher and 24 hours or lower.

[0099] Figure 3 This is an enlarged cross-sectional view centered on the first adhesive portion 34. (See image below.) Figure 3 As shown, the first adhesive portion 34 has a base portion 341 and a plurality of protrusions 342.

[0100] Figure 4 This is a plan view of fluid container 3. (See diagram below.) Figure 4 As shown, the first adhesive portion 34 has four straight sections in a top view (Z-axis view). That is, the base portion 341 has four straight sections in a top view. Specifically, the base portion 341 has a pair of straight sections extending along the X-axis direction and a pair of straight sections extending along the Y-axis direction. The base portion 341 extends in a rectangular shape in a top view. That is, the base portion 341 extends continuously in a ring shape to surround the internal space 30.

[0101] like Figure 3 As shown, each protrusion 342 is configured to protrude from the base 341 along the thickness direction (Z-axis direction) of the first adhesive portion 34. Specifically, the plurality of protrusions 342 have a plurality of first protrusions 342a and a plurality of second protrusions 342b. Each first protrusion 342a extends from the base 341 toward the metal support 31 side ( Figure 3 The upper side of the frame 32 protrudes from the base 341. Each second protrusion 342b extends from the base 341 toward the frame 32 side. Figure 3 (The lower side of the middle) protrudes. The first protrusion 342a and the second protrusion 342b may or may not be repeated in the top view.

[0102] Each protrusion 342 is arranged along the outer periphery of the metal support 31. That is, each protrusion 342 is arranged along the direction in which the first adhesive portion 34 extends. Therefore, each protrusion 342 is arranged in a ring shape when viewed from above. In addition, each protrusion 342 is arranged from the internal space 30 toward the outer periphery of the metal support 31.

[0103] The ratio (t2 / t1) of the thickness of the thickest part (t2) of the first adhesive portion 34 to the thickness of the thinnest part (t1) of the first adhesive portion 34 is preferably 1.2 or more. It should be noted that the thicknesses (t1) of the thinnest part and (t2) of the thickest part of the first adhesive portion 34 are measured based on multiple captured images. That is, the first adhesive portion 34 is cut along the direction from the internal space 30 toward the outer periphery of the metal support 31 to create... Figure 3The cross-section of the first adhesive portion 34 is shown. Multiple images of this cross-section are taken using a single electron microscope (SEM) at 1000x magnification. The thickness of the thinnest portion of the first adhesive portion 34 is measured in each image and defined as the thickness t1 of the thinnest portion. Similarly, the thickness of the thickest portion of the first adhesive portion 34 is measured in each image and defined as the thickness t2 of the thickest portion. Furthermore, the ratio (t2 / t1) of the thickness of the thickest portion of the first adhesive portion 34 to the thickness of the thinnest portion of the first adhesive portion 34 is calculated in each image. Preferably, this ratio (t2 / t1) is 1.2 or more in each image; however, it is sufficient if the ratio (t2 / t1) is 1.2 or more in at least one image.

[0104] The average thickness t0 of the first adhesive portion 34 is not particularly limited, for example, it is 1 μm or more and 100 μm or less. The average thickness t0 of the first adhesive portion 34 can be determined based on the images captured above. Specifically, as Figure 5 As shown, the thickness t of the first adhesive portion 34 can be measured at points where each captured image is divided into eight equal parts in the direction from the internal space 30 toward the outer periphery of the metal support 31. The average value of these measured values ​​is set as the average thickness t0 of the first adhesive portion 34. That is, the average value of all measured values ​​obtained in each captured image is set as the average thickness t0 of the first adhesive portion 34. The ratio (t3 / t0) of the thickness t3 of the metal support 31 to the thickness t0 of the first adhesive portion 34 can be, for example, 500 or less.

[0105] like Figure 3 As shown, in the direction from the internal space 30 toward the outer periphery of the metal support 31, the ratio (L / L0) of the length (L) of the thick portion of the first adhesive portion 34 to the length L0 of the first adhesive portion 34 can be 0.4 or less. Here, the thick portion of the first adhesive portion 34 refers to the portion that is thicker than the average thickness t0 of the first adhesive portion 34. For example, in the first adhesive portion 34... Figure 3 In that shape, the portions forming the protrusions 342 become thick portions, and the first adhesive portion 34 has multiple thick portions. In the case where multiple thick portions are formed, the length L of each thick portion is the sum of the lengths of all the thick portions. For example, in the case where the first adhesive portion 34 is... Figure 3 In that shape, the length L of the thick part refers to the sum of L1, L2, and L3.

[0106] The area where the protrusion 342 is formed in the first adhesive portion 34 becomes thicker. Here, the protrusion 342 refers to the portion that is 20% or more thicker than the average thickness t0 of the first adhesive portion 34.

[0107] The base 341 and the protrusion 342 are made of the materials described above as constituting the first adhesive portion 34. The protrusion 342 may be made of a different material than the base 341. For example, if the base 341 is made of chromium oxide, the protrusion 342 may be made of chromium manganese oxide. It should be noted that the protrusion 342 may be made of the same material as the base 341.

[0108] <Second Adhesive Part>

[0109] like Figure 2 As shown, the second adhesive portion 35 is disposed between the frame 32 and the interconnector 33. The second adhesive portion 35 bonds the frame 32 and the interconnector 33. In detail, the second adhesive portion 35 is engaged with both the frame 32 and the interconnector 33.

[0110] The second adhesive portion 35 seals the gap between the frame 32 and the interconnect 33. This prevents the raw material gas supplied to the hydrogen electrode 21 and the reducing gas generated at the hydrogen electrode 21 from leaking to the outside through the gap between the frame 32 and the interconnect 33.

[0111] The structure of the second adhesive portion 35 is substantially the same as that of the first adhesive portion 34 described above. Therefore, the description of the structure of the second adhesive portion 35 is omitted in this embodiment.

[0112] <Manufacturing Method>

[0113] The manufacturing method of the first adhesive portion 34 will now be described. First, the metal support 31 is pressed, thereby forming a recess in the area of ​​the second main surface 312 of the metal support 31 where it is bonded to the first adhesive portion 34. It should be noted that the recess can be formed on the second main surface 312 of the metal support 31 by cutting, etching, or laser ablation.

[0114] Similarly, the frame 32 is pressed to form a recess in the area of ​​the first main surface 321 of the frame 32 that is bonded to the first adhesive portion 34.

[0115] Furthermore, a paste containing a crystalline metal oxide is applied to the surface of at least one of the metal support 31 and the frame 32, and then heat treatment is performed to ensure that the metal support 31 and the frame 32 are tightly bonded, thereby forming the first adhesive portion 34. The heat treatment conditions can be appropriately set, for example, to 600°C or higher and 1100°C or lower, and for 0.5 hours or higher and 24 hours or lower.

[0116] (Modifications of the implementation method)

[0117] The embodiments of the present invention have been described above. However, the present invention is not limited to these embodiments, and various modifications can be made as long as they do not depart from the spirit of the present invention.

[0118] (a) In the first and second embodiments described above, the frame 32 and the interconnector 33 are separate components; however, the frame 32 and the interconnector 33 can be an integral component. In this case, the fluid container 3 does not have the second adhesive portion 35.

[0119] (b) In the first and second embodiments described above, the metal support 31 and the frame 32 are separate components; however, the metal support 31 and the frame 32 can be an integral component. In this case, the fluid container 3 does not have the first adhesive portion 34.

[0120] (c) In the above embodiments, a metal support 31 is shown as an example of a first metal component, and a frame 32 is shown as an example of a second metal component. However, the configuration of the fluid container 3 is not limited to this. For example, the frame 32 may be an example of a first metal component, and the metal support 31 may be an example of a second metal component.

[0121] (d) In the above embodiment, a plurality of protrusions 342 are formed around the entire circumference of the first adhesive portion 34; however, the configuration of the first adhesive portion 34 is not limited thereto. For example, the plurality of protrusions 342 may be formed only in one of the four straight portions of the first adhesive portion 34. More specifically, a plurality of protrusions 342 may be formed in a portion of the four straight portions that is prone to cracking. Alternatively, the plurality of protrusions 342 need not be formed throughout the entire straight portion, but may be formed only in a portion of the straight portion.

[0122] (e) In the above embodiments, the plurality of protrusions 342 have first protrusions 342a and second protrusions 342b; however, the configuration of the protrusions 342 is not limited thereto. For example, as Figure 6 As shown, the plurality of protrusions 342 may have only a first protrusion 342a. Alternatively, the plurality of protrusions 342 may have only a second protrusion 342b. Furthermore, in the above embodiment, the first adhesive portion 34 has a plurality of protrusions 342; however, it may have only one protrusion 342.

[0123] (f) In the above embodiments, an electrolytic single cell is used as an example of an electrochemical single cell for explanation; however, electrochemical single cells are not limited to electrolytic single cells. An electrochemical single cell refers to a combination of components that have a pair of electrodes configured to generate an electromotive force based on an overall redox reaction, in order to convert electrical energy into chemical energy, and components used to convert chemical energy into electrical energy. Therefore, electrochemical single cells also include, for example, fuel cells that use oxide ions or protons as carriers.

[0124] (f) In the above embodiments, the application of the fluid container of the present invention to an electrochemical single cell has been described; however, the fluid container can be used for various applications. For example, the fluid container can be used in a metallization reactor for the synthesis of methane from hydrogen and carbon dioxide.

[0125] Symbol Explanation

[0126] 2: Single battery main body

[0127] 3: Fluid container

[0128] 30: Interior Space

[0129] 31: Metal support

[0130] 313: Connecting hole

[0131] 32: Frame

[0132] 34: First adhesive part

[0133] 341: Base

[0134] 342: convex part

[0135] 100: Electrolytic single cell

Claims

1. A fluid container, characterized in that, have: A first metal component, the first metal component containing chromium; A second metal component, the second metal component containing chromium; and The adhesive portion, which is composed of an oxide primarily composed of chromium, bonds the first metal component and the second metal component together. The adhesive portion has: a base and a protrusion that protrudes from the base along the thickness direction.

2. The fluid container according to claim 1, characterized in that, The protrusion is made of a different material than the base.

3. The fluid container according to claim 1, characterized in that, The protrusion is made of the same material as the base.

4. The fluid container according to claim 1, characterized in that, The fluid container also includes an internal space for fluid flow. The adhesive portion extends in a ring shape to surround the internal space. The adhesive portion has a plurality of the aforementioned protrusions. The protrusions are arranged along the outer periphery of the first metal component.

5. The fluid container according to claim 1, characterized in that, The fluid container also includes an internal space for fluid flow. The adhesive portion has a plurality of the aforementioned protrusions. The protrusions are arranged from the internal space toward the outer periphery of the first metal component.

6. The fluid container according to claim 1, characterized in that, The ratio (t2 / t1) of the thickness of the thickest part of the adhesive portion to the thickness of the thinnest part of the adhesive portion is 1.2 or more.

7. The fluid container according to claim 1, characterized in that, The fluid container also includes an internal space for fluid flow. The adhesive portion has a thicker portion that is thicker than its average thickness. In the direction from the internal space toward the outer periphery of the first metal component, the ratio (L / L0) of the length (L) of the thick portion to the length (L0) of the adhesive portion is 0.4 or less.

8. The fluid container according to claim 1, characterized in that, The fluid container also includes an internal space for fluid flow. The adhesive part is a seal used to close the internal space.

9. An electrochemical single cell, characterized in that, have: The fluid container of claim 1; and A single-cell main body is disposed on the fluid container.

10. The electrochemical single cell according to claim 9, characterized in that, The fluid container has an internal space for fluid flow. The first metal component has: a plurality of connecting holes connected to the internal space. The single battery body is disposed on the first metal component in such a way that it covers the plurality of connecting holes.

11. The electrochemical single cell according to claim 9, characterized in that, The fluid container has an internal space for fluid flow. The second metal component has: a plurality of connecting holes connected to the internal space. The single battery body is disposed on the second metal component in such a way that it covers the plurality of connecting holes.

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