Electrochemical cell, electrochemical cell device, module and module housing device

Abstract

To provide an electrochemical cell, an electrochemical cell device, a module, and a module housing device capable of improving battery performance.SOLUTION: An electrochemical cell 1 includes an element portion and a conductive member 4. The element portion includes a fuel electrode 5, a solid electrolyte layer, 6 and an air electrode. The conductive member 4 is connected to the element portion. The conductive member 4 includes a first portion 41 and a second portion 42. The first portion 41 is connected to the fuel electrode 5. The second portion 42 contains 4% by mass or more and 12% by mass or less of Mg, and is in contact with the solid electrolyte layer 6.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present disclosure relates to electrochemical cells, electrochemical cell devices, modules and module containment devices. [Background technology]

[0002] In recent years, various fuel cell stack devices having multiple fuel cell units have been proposed as next-generation energy sources. A fuel cell unit is a type of electrochemical cell that can generate electric power using a fuel gas such as a hydrogen-containing gas and an oxygen-containing gas such as air. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2015-35416 A Summary of the Invention [Problem to be solved by the invention]

[0004] However, the above-mentioned fuel cell stack device has room for improvement in terms of improving cell performance.

[0005] One aspect of the embodiment has been made in view of the above, and aims to provide an electrochemical cell, an electrochemical cell device, a module, and a module housing device that can improve battery performance. [Means for solving the problem]

[0006] An electrochemical cell according to one aspect of the embodiment includes an element portion and a conductive member. The element portion has an anode, a solid electrolyte layer, and an air electrode. The conductive member is connected to the element portion. The conductive member has a first portion and a second portion. The first portion is connected to the anode. The second portion contains 4% to 12% by mass of Mg and is in contact with the solid electrolyte layer.

[0007] The electrochemical cell device of the present disclosure also includes a cell stack including the electrochemical cell described above.

[0008] The module of the present disclosure includes the electrochemical cell device described above and a container for housing the electrochemical cell device.

[0009] The module housing device of the present disclosure includes the above-described module, an auxiliary device for operating the module, and an exterior case for housing the module and the auxiliary device. Effect of the Invention

[0010] According to one aspect of the embodiment, it is possible to provide an electrochemical cell, an electrochemical cell device, a module, and a module housing device that can improve battery performance. [Brief description of the drawings]

[0011] [Figure 1A] FIG. 1A is a cross-sectional view illustrating an example of an electrochemical cell according to a first embodiment. [Figure 1B] FIG. 1B is a side view of an example of the electrochemical cell according to the first embodiment, as viewed from the air electrode side. [Figure 1C] FIG. 1C is a side view of an example of an electrochemical cell according to the first embodiment, viewed from the interconnector side. [Figure 2A] FIG. 2A is a perspective view showing an example of a cell stack device according to the first embodiment. [Figure 2B] FIG. 2B is a cross-sectional view taken along line XX shown in FIG. 2A. [Figure 2C] FIG. 2C is a top view showing an example of the cell stack device according to the first embodiment. [Diagram 3] FIG. 3 is an enlarged cross-sectional view of region A shown in FIG. 1A. [Figure 4] FIG. 4 is an external perspective view illustrating an example of the module according to the first embodiment. [Diagram 5]FIG. 5 is an exploded perspective view illustrating an example of a module housing device according to the first embodiment. [Figure 6A] FIG. 6A is a cross-sectional view that diagrammatically illustrates a cell stack device according to a second embodiment. [Figure 6B] FIG. 6B is a perspective view showing an example of a cell according to the second embodiment. [Figure 6C] FIG. 6C is a partial cross-sectional view of the cell shown in FIG. 6B. [Figure 6D] FIG. 6D is an enlarged cross-sectional view of region B shown in FIG. 6C. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] Hereinafter, embodiments of an electrochemical cell, an electrochemical cell device, a module, and a module housing device disclosed in the present application will be described in detail with reference to the accompanying drawings. Note that the present invention is not limited to the embodiments described below.

[0013] In addition, it should be noted that the drawings are schematic, and that the dimensional relationships, ratios, etc. of the elements may differ from the reality. Furthermore, the drawings may include parts whose dimensional relationships, ratios, etc. differ from one another.

[0014] [First embodiment] <Cell configuration> First, with reference to Figures 1A to 1C, an electrochemical cell according to a first embodiment will be described using an example of a solid oxide fuel cell. The electrochemical cell device may include a cell stack having a plurality of electrochemical cells. An electrochemical cell device having a plurality of electrochemical cells will be simply referred to as a cell stack device.

[0015] Fig. 1A is a cross-sectional view showing an example of an electrochemical cell according to the first embodiment, Fig. 1B is a side view of the example of the electrochemical cell according to the first embodiment as viewed from the air electrode side, and Fig. 1C is a side view of the example of the electrochemical cell according to the first embodiment as viewed from the interconnector side. Figs. 1A to 1C show enlarged views of parts of each component of cell 1. Hereinafter, the electrochemical cell may be simply referred to as a cell.

[0016] 1A to 1C, cell 1 is a hollow flat plate-like elongated plate. As shown in Fig. 1B, the shape of the entire cell 1 seen from the side is, for example, a rectangle with a side length of 5 cm to 50 cm in the length direction L and a length of 1 cm to 10 cm in the width direction W perpendicular to the length direction L. The thickness of the entire cell 1 in the thickness direction T is, for example, 1 mm to 5 mm.

[0017] 1A, the cell 1 includes a conductive support substrate 2, an element portion 3, and an interconnector 4. The support substrate 2 is columnar having a pair of opposing first and second surfaces n1 and n2, and a pair of arc-shaped side surfaces m connecting the first surface n1 and the second surface n2.

[0018] The element section 3 is located on a first surface n1 of the support substrate 2. The element section 3 has a fuel electrode 5, a solid electrolyte layer 6, and an air electrode 8. In the example shown in FIG. 1A, an interconnector 4 is located on a second surface n2 of the cell 1. The cell 1 may include an intermediate layer 7 between the solid electrolyte layer 6 and the air electrode 8.

[0019] As shown in FIG. 1B, the air electrode 8 does not extend to the lower end of the cell 1. At the lower end of the cell 1, only the solid electrolyte layer 6 is exposed on the surface of the first face n1. As shown in FIG. 1C, the interconnector 4 may extend to the lower end of the cell 1. At the lower end of the cell 1, the interconnector 4 and the solid electrolyte layer 6 are exposed on the surface. As shown in FIG. 1A, the solid electrolyte layer 6 is exposed on the surface of a pair of arc-shaped side faces m of the cell 1. The interconnector 4 does not have to extend to the lower end of the cell 1.

[0020] Each of the components constituting the cell 1 will be described below.

[0021] The support substrate 2 has therein gas flow channels 2a through which gas flows. The example of the support substrate 2 shown in FIG. 1A has six gas flow channels 2a. The support substrate 2 has gas permeability and allows the fuel gas flowing through the gas flow channels 2a to permeate to the anode 5. The support substrate 2 may be conductive. The conductive support substrate 2 collects electricity generated in the element section 3 to the interconnector 4.

[0022] The material of the support substrate 2 includes, for example, an iron group metal component and an inorganic oxide. The iron group metal component may be, for example, Ni (nickel) and / or NiO. The inorganic oxide may be, for example, a specific rare earth element oxide. The rare earth element oxide may include, for example, Y.

[0023] The material of the fuel electrode 5 may be a generally known material. The fuel electrode 5 may be made of a porous conductive ceramic, for example, a ceramic containing an ion conductive material such as ZrO2 in which rare earth element oxides are dissolved, and Ni and / or NiO. The rare earth element oxides contain a plurality of rare earth elements selected from Sc, Y, La, Nd, Sm, Gd, Dy, and Yb. ZrO2 in which rare earth element oxides are dissolved may be called stabilized zirconia. Stabilized zirconia also includes partially stabilized zirconia.

[0024] The solid electrolyte layer 6 is an electrolyte and acts as a bridge between ions between the fuel electrode 5 and the air electrode 8. At the same time, the solid electrolyte layer 6 has gas barrier properties and makes it difficult for leakage of fuel gas and oxygen-containing gas to occur.

[0025] The material of the solid electrolyte layer 6 may be, for example, an ion conductive material such as ZrO2 in which 3 mol % to 15 mol % of a rare earth element oxide is dissolved. The rare earth element oxide may include, for example, one or more rare earth elements selected from Sc, Y, La, Nd, Sm, Gd, Dy, and Yb. The solid electrolyte layer 6 may include, for example, ZrO2 in which Yb, Sc, or Gd is dissolved, CeO2 in which La, Nd, or Yb is dissolved, BaZrO3 in which Sc or Yb is dissolved, or BaCeO3 in which Sc or Yb is dissolved.

[0026] The air electrode 8 has gas permeability. The open porosity (void ratio) of the air electrode 8 may be in the range of, for example, 20% to 50%, and particularly 30% to 50%.

[0027] There are no particular limitations on the material of the air electrode 8 as long as it is a material generally used for air electrodes. The material of the air electrode 8 may be, for example, a conductive ceramic such as a so-called ABO3 type perovskite oxide.

[0028] The material of the air electrode 8 may be, for example, a composite oxide in which Sr (strontium) and La (lanthanum) coexist at the A site. x Sr 1-x Co y Fe 1-y O3, La x Sr 1-x MnO3, La x Sr 1-x FeO3, La x Sr 1-x CoO3, etc. Note that x is 0 <x<1、yは0<y<1である。

[0029] Furthermore, when the element unit 3 has the intermediate layer 7, the intermediate layer 7 functions as a diffusion suppression layer. The intermediate layer 7 makes it difficult for Sr (strontium) contained in the air electrode 8 to diffuse into the solid electrolyte layer 6 containing, for example, Zr, thereby making it difficult for a resistive layer of SrZrO3 to be formed in the solid electrolyte layer 6.

[0030] There are no particular limitations on the material of the intermediate layer 7, so long as it is generally used as a diffusion suppression layer for Sr. The material of the intermediate layer 7 may include, for example, cerium oxide (CeO2) in which a rare earth element other than Ce (cerium) is dissolved. As such a rare earth element, for example, Gd (gadolinium), Sm (samarium), etc. may be used.

[0031] The interconnector 4 has electrical conductivity and is connected to the element portion 3. The interconnector 4 is an example of a conductive member.

[0032] Moreover, the interconnector 4 is dense, and makes it difficult for the fuel gas flowing through the gas flow passage 2a located inside the support substrate 2 and the oxygen-containing gas flowing outside the support substrate 2 to leak. The interconnector 4 may have a relative density of 93% or more, particularly 95% or more. The interconnector 4 may have a porosity of, for example, 2% or less.

[0033] The interconnector 4 may contain La. The interconnector 4 may also be an oxide ceramic having electrical conductivity. For example, a lanthanum chromite-based perovskite oxide (LaCrO3-based oxide) or a lanthanum strontium titanium-based perovskite oxide (LaSrTiO3-based oxide) may be used as the material for the interconnector 4. These materials are not easily reduced or oxidized even when in contact with a fuel gas such as a hydrogen-containing gas and an oxygen-containing gas such as air.

[0034] The interconnector 4 may contain, for example, about 5 mass % Mg. When the interconnector 4 contains Mg, the thermal expansion coefficient of the interconnector 4 can be made closer to the thermal expansion coefficient of each member of the element unit 3 to which the interconnector 4 is connected, i.e., the support substrate 2, the fuel electrode 5, and the solid electrolyte layer 6. This makes it difficult for cracks to occur in the interconnector 4, or difficult for the interconnector 4 to peel off from the element unit 3. This makes it possible to increase the durability of the cell 1.

[0035] The interconnector 4 may contain other elements such as Ni, etc. Details of the interconnector 4 will be described later.

[0036] <Configuration of cell stack device> Next, a cell stack device according to this embodiment using the above-mentioned cell 1 will be described with reference to Figures 2A to 2C. Figure 2A is a perspective view showing an example of the cell stack device according to the first embodiment, Figure 2B is a cross-sectional view taken along line XX shown in Figure 2A, and Figure 2C is a top view showing an example of the cell stack device according to the first embodiment.

[0037] As shown in FIG. 2A, the cell stack device 10 includes a cell stack 11 having a plurality of cells 1 arranged (stacked) in a thickness direction T of the cells 1 (see FIG. 1A), and a fixing member 12.

[0038] The fixing member 12 has a fixing material 13 and a support member 14. The support member 14 supports the cell 1. The fixing material 13 fixes the cell 1 to the support member 14. The support member 14 also has a support body 15 and a gas tank 16. The support body 15 and the gas tank 16, which are the support member 14, are made of metal and are conductive.

[0039] 2B, the support 15 has insertion holes 15a into which the lower ends of the multiple cells 1 are inserted. The lower ends of the multiple cells 1 and the inner wall of the insertion holes 15a are joined with a fixing material 13.

[0040] The gas tank 16 has an opening for supplying a reaction gas to the cells 1 through the insertion holes 15a, and a groove 16a located around the opening. The outer peripheral edge of the support 15 is joined to the gas tank 16 by a joining material 21 filled in the groove 16a of the gas tank 16.

[0041] In the example shown in Fig. 2A, fuel gas is stored in an internal space 22 formed by a support body 15, which is the support member 14, and a gas tank 16. A gas circulation pipe 20 is connected to the gas tank 16. The fuel gas is supplied to the gas tank 16 through this gas circulation pipe 20, and is supplied from the gas tank 16 to a gas flow path 2a (see Fig. 1A) inside the cell 1. The fuel gas supplied to the gas tank 16 is generated in a reformer 102 (see Fig. 4), which will be described later.

[0042] The hydrogen-rich fuel gas can be produced by steam reforming of the raw fuel, etc. When the fuel gas is produced by steam reforming, the fuel gas contains water vapor.

[0043] The example shown in FIG. 2A includes two rows of cell stacks 11, two supports 15, and a gas tank 16. Each of the two rows of cell stacks 11 has a plurality of cells 1. Each cell stack 11 is fixed to each of the supports 15. The gas tank 16 has two through holes on the upper surface. Each of the supports 15 is disposed in each of the through holes. An internal space 22 is formed by one gas tank 16 and two supports 15.

[0044] The shape of the insertion hole 15a is, for example, an oval shape when viewed from above. For example, the length of the insertion hole 15a in the arrangement direction of the cells 1, i.e., the thickness direction T, is greater than the distance between the two end current collecting members 17 located at both ends of the cell stack 11. The width of the insertion hole 15a is, for example, greater than the length of the cell 1 in the width direction W (see FIG. 1A).

[0045] 2B, the joints between the inner walls of the insertion holes 15a and the lower ends of the cells 1 are filled with a fixing material 13 and solidified. As a result, the inner walls of the insertion holes 15a and the lower ends of the multiple cells 1 are respectively joined and fixed, and the lower ends of the cells 1 are joined and fixed to each other. The gas flow paths 2a of each cell 1 communicate with the internal space 22 of the support member 14 at their lower ends.

[0046] A material having low electrical conductivity, such as glass, can be used for the fixing material 13 and the bonding material 21. Specific materials for the fixing material 13 and the bonding material 21 include amorphous glass, and in particular, crystallized glass.

[0047] As the crystallized glass, for example, any of materials such as SiO2-CaO, MgO-B2O3, La2O3-B2O3-MgO, La2O3-B2O3-ZnO, and SiO2-CaO-ZnO may be used, and in particular, SiO2-MgO-based materials may be used.

[0048] 2B, a conductive member 18 is interposed between adjacent cells 1 among the multiple cells 1. The conductive member 18 electrically connects one adjacent cell 1 to the other adjacent cell 1 in series. More specifically, the conductive member 18 connects the fuel electrode 5 of one cell 1 to the air electrode 8 of the other cell 1.

[0049] As shown in Fig. 2B, an end current collecting member 17 is electrically connected to the cell 1 located at the outermost position in the arrangement direction of the multiple cells 1. The end current collecting member 17 is connected to a conductive part 19 protruding to the outside of the cell stack 11. The conductive part 19 collects electricity generated by power generation in the cells 1 and draws it out to the outside. Note that the end current collecting member 17 is not shown in Fig. 2A.

[0050] 2C, the cell stack device 10 may be a single battery in which two cell stacks 11A, 11B are connected in series. In this case, the conductive part 19 of the cell stack device 10 may have a positive terminal 19A, a negative terminal 19B, and a connection terminal 19C.

[0051] The positive electrode terminal 19A is a positive electrode when the electric power generated by the cell stack 11 is output to the outside, and is electrically connected to the end current collecting member 17 on the positive electrode side of the cell stack 11A. The negative electrode terminal 19B is a negative electrode when the electric power generated by the cell stack 11 is output to the outside, and is electrically connected to the end current collecting member 17 on the negative electrode side of the cell stack 11B.

[0052] The connection terminal 19C electrically connects the end current collecting member 17 on the negative electrode side in the cell stack 11A and the end current collecting member 17 on the positive electrode side in the cell stack 11B.

[0053] <Interconnector details> Next, details of the interconnector 4 according to the first embodiment will be described with reference to Fig. 3. Fig. 3 is an enlarged cross-sectional view of a region A shown in Fig. 1A.

[0054] 3, the interconnector 4 has a first portion 41 and a second portion 42. The first portion 41 includes an interface 4b between the interconnector 4 and the support substrate 2, and is a portion extending in the thickness direction T of the cell 1. The first portion 41 is in contact with the fuel electrode 5. That is, the first portion 41 is a portion connected to the fuel electrode 5.

[0055] The second portion 42 includes the interface 4c between the interconnector 4 and the solid electrolyte layer 6, and is a portion extending in the thickness direction T of the cell 1. That is, the second portion 42 is a portion in contact with the solid electrolyte layer 6. The second portion 42 contains 4 mass % or more and 12 mass % or less of Mg. This makes it difficult for cracks to occur in the second portion 42 of the interconnector 4, or makes it difficult for the interconnector 4 to peel off from the solid electrolyte layer 6. This makes it possible to increase the durability of the interconnector 4, and therefore improve the battery performance of the cell 1.

[0056] Furthermore, the second portion 42 may have a first portion 421 and a second portion 422 having different Mg contents. The first portion 421 is a portion of the second portion 42 that is closer to the first portion 41. The second portion 422 is a portion that is located farther from the first portion 41 than the first portion 421. The second portion 422 may include an end portion 4a in the width direction W of the interconnector 4.

[0057] The second portion 422 may have a higher Mg content than the first portion 421. This allows the interconnector 4 to have an appropriate thermal expansion coefficient, thereby improving the battery performance of the cell 1.

[0058] Furthermore, the first portion 421 may have a smaller porosity than the second portion 422. This makes it difficult for cracks or peeling to occur due to thermal expansion and / or thermal contraction of the interconnector 4, thereby improving the battery performance of the cell 1.

[0059] The interconnector 4 does not have to be in contact with the fuel electrode 5. For example, a current collector, a support and / or an intermediate layer may be located between the interconnector 4 and the fuel electrode 5. That is, the interconnector 4 may be connected to the fuel electrode 5 via a separate member such as a current collector, a support and / or an intermediate layer.

[0060] <module> Next, a module according to an embodiment of the present disclosure using the above-mentioned cell stack device 10 will be described with reference to Fig. 4. Fig. 4 is an external perspective view showing a module according to a first embodiment. Fig. 4 shows a state in which the front and rear surfaces, which are part of the storage container 101, have been removed and the cell stack device 10 of the fuel cell stored inside has been removed to the rear.

[0061] 4, the module 100 includes a storage container 101 and a cell stack device 10 housed in the storage container 101. In addition, above the cell stack device 10, a reformer 102 is disposed.

[0062] The reformer 102 reforms raw fuel such as natural gas or kerosene to generate fuel gas and supplies it to the cell 1. The raw fuel is supplied to the reformer 102 through a raw fuel supply pipe 103. The reformer 102 may include a vaporizer 102a that vaporizes water, and a reformer 102b. The reformer 102b includes a reforming catalyst (not shown) and reforms the raw fuel into fuel gas. Such a reformer 102 can perform steam reforming, which is a highly efficient reforming reaction.

[0063] The fuel gas generated in the reformer 102 is supplied to the gas flow channel 2a of the cell 1 (see FIG. 1A) through the gas distribution pipe 20, the gas tank 16, and the support member 14.

[0064] Furthermore, in the module 100 having the above-mentioned configuration, the temperature inside the module 100 during normal power generation becomes approximately 500°C to 1000°C as the gas is combusted and the cells 1 generate power.

[0065] In such a module 100, as described above, by housing the cell stack device 10 that improves the battery performance, the module 100 can have improved battery performance.

[0066] <Module storage device> Fig. 5 is an exploded perspective view showing an example of a module housing device according to the first embodiment. A module housing device 110 according to this embodiment includes an exterior case 111, the module 100 shown in Fig. 4, and auxiliary equipment (not shown). The auxiliary equipment operates the module 100. The module 100 and the auxiliary equipment are housed in the exterior case 111. Note that some components are omitted in Fig. 5.

[0067] An exterior case 111 of a module accommodating device 110 shown in Fig. 5 has support columns 112 and an exterior plate 113. A partition plate 114 divides the interior of the exterior case 111 into upper and lower sections. The space above the partition plate 114 in the exterior case 111 is a module accommodating chamber 115 that accommodates the module 100, and the space below the partition plate 114 in the exterior case 111 is an auxiliary equipment accommodating chamber 116 that accommodates auxiliary equipment that operates the module 100. Note that in Fig. 5, the auxiliary equipment accommodated in the auxiliary equipment accommodating chamber 116 is omitted.

[0068] In addition, the partition plate 114 has an air flow port 117 for allowing air from the auxiliary equipment housing chamber 116 to flow toward the module housing chamber 115. The exterior plate 113 constituting the module housing chamber 115 has an exhaust port 118 for exhausting air from within the module housing chamber 115.

[0069] In such a module accommodating device 110, as described above, by accommodating the module 100 with improved battery performance in the module accommodating chamber 115, it is possible to provide a module accommodating device 110 with improved battery performance.

[0070] In the above embodiment, a case where a hollow flat support substrate is used is exemplified, but the present invention can also be applied to a cell stack device that uses a cylindrical support substrate.

[0071] [Second embodiment] Next, a cell and a cell stack device according to a second embodiment will be described with reference to FIGS. 6A to 6D.

[0072] In the above-described embodiment, a so-called "vertical stripe type" has been exemplified in which only one element unit including a fuel electrode, a solid electrolyte layer, and an air electrode is provided on the surface of a support substrate. However, the present invention can also be applied to a horizontal stripe type cell stack device in which so-called "horizontal stripe type" cells are arranged in which element units are provided at multiple locations spaced apart from each other on the surface of a support substrate and adjacent element units are electrically connected.

[0073] FIG. 6A is a cross-sectional view that shows a schematic diagram of a cell stack device according to a second embodiment. As shown in FIG. 6A, in a cell stack device 10A, a plurality of cells 1A extend in a length direction L from a pipe 73 that circulates a fuel gas. The cells 1A have a plurality of element units 3 on a support substrate 2. A gas flow path 2a through which gas flows from the pipe 73 is provided inside the support substrate 2. The element units 3 on the support substrate 2 are electrically connected by a connection layer 8A that will be described later. The plurality of cells 1A are electrically connected to each other via a conductive member 18. The conductive member 18 is located between the element units 3 of each cell 1A, and connects adjacent cells 1A.

[0074] Fig. 6B is a perspective view showing an example of a cell according to the second embodiment. Fig. 6C is a partial cross-sectional view of the cell shown in Fig. 6B. In the cell 1A, element portions 3 and connection portions 3A are alternately positioned along the X-axis direction.

[0075] The element unit 3 is formed by laminating, in this order from the supporting substrate 2 side, a fuel electrode 5, a second intermediate layer 24, an interconnector 4, a solid electrolyte layer 6, a first intermediate layer 9, and an air electrode 8. A connection layer 8A is located on the surface of the air electrode 8 to electrically connect adjacent element units 3 in the X-axis direction.

[0076] FIG. 6D is an enlarged cross-sectional view of region B shown in FIG. 6C. As shown in FIG. 6D, the interconnector 4 has a first portion 41 and a second portion 42. The first portion 41 is a portion sandwiched between the connection layer 8A and the second intermediate layer 24, and the second portion 42 is a portion sandwiched between the solid electrolyte layer 6 and the second intermediate layer 24. The second portion 42 contains 4% by mass to 12% by mass of Mg. This makes it difficult for cracks to occur in the second portion 42 of the interconnector 4, or makes it difficult for the interconnector 4 to peel off from the solid electrolyte layer 6. This makes it possible to increase the durability of the interconnector 4, thereby improving the battery performance of the cell 1.

[0077] <Other Modifications> Next, cell stack devices according to other modified examples of the embodiment will be described.

[0078] In the above embodiments, a fuel cell, a fuel cell stack device, a fuel cell module and a fuel cell device are shown as examples of an "electrochemical cell", "electrochemical cell device", "module" and "module containing device", but other examples may be an electrolytic cell, an electrolytic cell stack device, an electrolytic module and an electrolytic device, respectively.

[0079] Although the present disclosure has been described in detail above, the present disclosure is not limited to the above-described embodiments, and various modifications, improvements, etc. are possible without departing from the gist of the present disclosure.

[0080] As described above, the electrochemical cell (cell 1) according to the embodiment includes an element unit 3 and a conductive member (interconnector 4). The element unit 3 has an anode 5, a solid electrolyte layer 6, and an air electrode 8. The conductive member is connected to the element unit 3. The conductive member has a first portion 41 and a second portion 42. The first portion 41 is connected to the anode 5. The second portion 42 contains 4 mass % or more and 12 mass % or less of Mg, and is in contact with the solid electrolyte layer 6. This can improve the battery performance of the cell 1.

[0081] Moreover, the electrochemical cell device (cell stack device 10) according to the embodiment has a cell stack 11 including the electrochemical cell described above. This makes it possible to provide the cell stack device 10 with improved battery performance.

[0082] Moreover, the module 100 according to the embodiment includes the electrochemical cell device described above, and a storage container 101 that stores the electrochemical cell device. This makes it possible to provide the module 100 with improved battery performance.

[0083] Moreover, the module housing device 110 according to the embodiment includes the above-described module 100, an auxiliary device for operating the module 100, and an exterior case for housing the module 100 and the auxiliary device. This allows the module housing device 110 to improve battery performance.

[0084] The disclosed embodiments should be considered to be illustrative and not restrictive in all respects. Indeed, the above-described embodiments may be embodied in various forms. Furthermore, the above-described embodiments may be omitted, substituted, or modified in various forms without departing from the scope and spirit of the appended claims. [Explanation of symbols]

[0085] 1 cell 3. Element section 4 Interconnector 5 Fuel electrode 6 Solid electrolyte layer 7. Middle Tier 8 Air electrode 10 Cell stack device 11 Cell stack 12 Fixing member 13 Fixing material 14 Support member 15 Support 16 Gas Tank 17 End current collecting member 18 Conductive materials 41 Part 1 42 Part 2 100 Modules 110 Module storage device

Claims

1. an element portion having a fuel electrode, a solid electrolyte layer, and an air electrode; a conductive member connected to the element portion; Equipped with The conductive member has a first portion connected to the fuel electrode and a second portion containing 4 mass % to 12 mass % Mg and contacting the solid electrolyte layer. Electrochemical cell.

2. The conductive member has a porosity of 2% or less.

10. The electrochemical cell of claim 1.

3. The second portion has a first portion close to the first portion, and a second portion located farther from the first portion than the first portion and having a higher Mg content than the first portion.

3. An electrochemical cell according to claim 1 or 2.

4. the second portion has a first portion close to the first portion and a second portion located farther from the first portion than the first portion, The first region has a smaller porosity than the second region.

4. An electrochemical cell according to claim 1.

5. The conductive member is an oxide ceramic containing La and having electrical conductivity.

5. An electrochemical cell according to claim 1.

6. A cell stack comprising the electrochemical cell according to any one of claims 1 to 5. Electrochemical cell setup.

7. The electrochemical cell device according to claim 6 ; A container for housing the electrochemical cell device; A module comprising:

8. A module according to claim 7; Auxiliary equipment for operating the module; an exterior case that houses the module and the auxiliary equipment; A module housing device comprising:

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