Cell, cell stack device, module, and module housing device

Abstract

To provide a fuel cell cell, a cell stack apparatus, a module, and a module housing apparatus that can improve battery performance.SOLUTION: A cell 1 has an element part 3, a conductive member 4 connected to the element part 3, and an oxygen impermeable layer 9 covering the conductive member 4. The cell 1 further has a support substrate 2 that supports the element 3, and the conductive member 4 is connected to the element 3 and the support substrate 2.SELECTED DRAWING: Figure 1A

Description

[Technical field]

[0001] The present disclosure relates to a cell, a cell stack device, a module, and a module housing device. [Background technology]

[0002] In recent years, various fuel cell stack devices equipped with multiple fuel cell units have been proposed as next-generation energy sources. A fuel cell unit is a type of 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] International Publication No. 2009 / 131180 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 a cell, a cell stack device, a module, and a module housing device that can improve battery performance. [Means for solving the problem]

[0006] A cell according to an embodiment includes an element portion, a conductive member, and an oxygen-impermeable layer. The conductive member is connected to the element portion. The oxygen-impermeable layer covers the conductive member.

[0007] The cell stack device of the present disclosure has a cell stack including a plurality of the cells described above.

[0008] Moreover, the module of the present disclosure includes the cell stack device described above and a storage container that stores the cell stack 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 a cell, a cell stack 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 showing an example of a cell according to a first embodiment. [Figure 1B] FIG. 1B is a side view of an example of a cell according to the first embodiment, viewed from the air electrode side. [Figure 1C] FIG. 1C is a side view of an example of a cell according to the first embodiment, viewed from the interconnector side. [Figure 1D] FIG. 1D is a vertical cross-sectional view illustrating an example of a cell according to the first embodiment. [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 external perspective view illustrating an example of the module according to the first embodiment. [Figure 4] FIG. 4 is an exploded perspective view illustrating an example of a module housing device according to the first embodiment. [Diagram 5] FIG. 5 is a schematic diagram comparing hydrogen partial pressures during OCV. [Figure 6]FIG. 6 is a schematic diagram comparing OCVs. [Figure 7] FIG. 7 is a schematic diagram comparing battery performance. [Figure 8] FIG. 8 is a cross-sectional view showing a cell according to the second embodiment. [Figure 9] FIG. 9 is a cross-sectional view showing an example of a cell stack device according to the second embodiment. [Figure 10] FIG. 10 is an enlarged view of area A shown in FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] Hereinafter, embodiments of a cell, a cell stack 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 disclosure 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 FIGS. 1A to 1D, a cell according to a first embodiment will be described using an example of a solid oxide fuel cell.

[0015] Fig. 1A is a cross-sectional view showing an example of a cell according to the first embodiment, Fig. 1B is a side view of the example of the cell according to the first embodiment seen from the air electrode side, Fig. 1C is a side view of the example of the cell according to the first embodiment seen from the interconnector side, and Fig. 1D is a vertical cross-sectional view of the example of the cell according to the first embodiment. Note that Figs. 1A to 1D show enlarged views of parts of each component of cell 1.

[0016] 1A to 1D, the cell 1 is a hollow flat plate-like elongated plate. As shown in Fig. 1B, the shape of the entire cell 1 as viewed 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 1 mm to 5 mm.

[0017] 1A, the cell 1 includes a conductive support substrate 2, an element section 3, an interconnector 4, and an oxygen-impermeable layer 9. The support substrate 2 is columnar having a pair of opposing flat surfaces n1, n2, and a pair of arc-shaped side surfaces m connecting the flat surfaces n1, n2.

[0018] The element section 3 is provided on one flat 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, which is a conductive member, is provided on the other flat surface n2 of the support substrate 2. The cell 1 may also have 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 flat surface n1. As shown in FIG. 1C, the oxygen impermeable layer 9 may extend to the lower end of the cell 1. At the lower end of the cell 1, the oxygen impermeable layer 9 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 surfaces m of the cell 1. The interconnector 4 does not extend to the upper and lower ends of the cell 1 and is not exposed to the outside of the cell 1.

[0020] Each of the members 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 power generation element 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, one or more rare earth elements selected from Sc, Y, La, Nd, Sm, Gd, Dy, and Yb.

[0023] A generally known material can be used for the fuel electrode 5. The fuel electrode 5 is made of a porous conductive ceramic, such as calcium oxide, magnesium oxide, or ZrO 2 and ceramics containing Ni and / or NiO. The rare earth element oxide may contain a plurality of rare earth elements selected from, for example, Sc, Y, La, Nd, Sm, Gd, Dy, and Yb. Calcium oxide, magnesium oxide, or ZrO in which a rare earth element oxide is solid-dissolved may be used. 2 The stabilized zirconia may be called a 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 is, for example, ZrO 2The rare earth element oxide may contain, 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 be, for example, ZrO in which Yb, Sc, or Gd is solid-dissolved. 2 and La, Nd or Yb may be solid-dissolved in CeO. 2 BaZrO 3 BaCeO 3 may include:

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

[0027] There is no particular limitation 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 is, for example, so-called ABO 3 The material may be a conductive ceramic such as a perovskite-type 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 O 3 , La x Sr 1-x MnO 3 , La x Sr 1-x FeO 3 , La x Sr 1-x Chief of Staff 3 In addition, x is 0 <x<1、yは0<y<1である。

[0029] Furthermore, when the element section 3 has the intermediate layer 7, the intermediate layer 7 functions as a diffusion suppression layer. When an element such as Sr (strontium) contained in the air electrode 8 diffuses into the solid electrolyte layer 6, the solid electrolyte layer 6 is filled with, for example, SrZrO 3The intermediate layer 7 suppresses the diffusion of Sr and is a SrZrO 3 It makes it difficult for other oxides having electrical insulating properties to form.

[0030] There is no particular limitation on the material of the intermediate layer 7 as long as it is generally used as a diffusion suppression layer for Sr. The material of the intermediate layer 7 is, for example, cerium oxide (CeO 2 ) As such rare earth elements, Gd (gadolinium), Sm (samarium), etc. are used.

[0031] Moreover, the interconnector 4 is dense, and makes it difficult for leakage of the fuel gas flowing through the gas flow passage 2a inside the support substrate 2 and the oxygen-containing gas flowing outside the support substrate 2 to occur. The interconnector 4 contacts the fuel gas flowing through the gas flow passage 2a through the support substrate 2. The interconnector 4 may have a relative density of 93% or more, particularly 95% or more.

[0032] The material for the interconnector 4 is a lanthanum chromite-based perovskite oxide (LaCrO 3 system oxides), or lanthanum strontium titanium system perovskite-type oxides (LaSrTiO 3 These materials are electrically conductive and are not reduced or oxidized even when in contact with a fuel gas (hydrogen-containing gas) and an oxygen-containing gas (air, etc.).

[0033] The oxygen impermeable layer 9 is positioned so as to cover the surface of the interconnector 4 exposed to the outside of the cell 1. As described above, the interconnector 4 is made of a material that is unlikely to cause leakage of the oxygen-containing gas flowing outside the support substrate 2. However, at high temperatures, for example, exceeding 700°C, the interconnector 4 has a non-negligible level of oxygen permeability compared to the solid electrolyte layer 6, and for example, about several percent of oxygen is converted into oxygen ions (O 2- The oxygen that has permeated the interconnector 4 reacts with hydrogen in the fuel gas inside the support substrate 2 or the gas flow channel 2a to form H2 In addition, the decrease in hydrogen partial pressure in the fuel gas due to hydrogen consumption can lead to a decrease in open circuit voltage (OCV) and a decrease in cell performance.

[0034] Therefore, in the cell 1 according to this embodiment, an oxygen impermeable layer 9 is positioned between the oxygen-containing gas flowing outside the cell 1 and the interconnector 4. The oxygen impermeable layer 9 has lower oxygen permeability than the interconnector 4. This reduces consumption of fuel gas outside the solid electrolyte layer 6, thereby improving the cell performance.

[0035] The oxygen impermeable layer 9 is required to have the above-mentioned low oxygen permeability as well as electronic conductivity equivalent to that of the interconnector 4. Examples of materials for such an oxygen impermeable layer 9 include metals such as platinum (Pt) and silver (Ag), titanium oxide (TiO 2 ), rhenium oxide (ReO 2 ) oxide may also be used.

[0036] <Configuration of cell stack device> Next, a cell stack device 10 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 a 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 a 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, for example, metal.

[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. 5), 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 the one gas tank 16 and the 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] Examples of the crystallized glass include SiO 2 -CaO series, MgO-B 2 O 3 System, La 2 O 3 -B 2 O 3 -MgO, La 2 O 3 -B 2 O 3 -ZnO, SiO 2 -CaO-ZnO system, etc., may be used, particularly SiO 2 -MgO-based materials may also be used.

[0048] 2B, a connection member 18 is interposed between adjacent cells 1 among the multiple cells 1. The connection member 18 electrically connects the fuel electrode 5 of one adjacent cell 1 to the air electrode 8 of the other cell 1 in series. More specifically, the connection member 18 connects the poor oxygen permeation layer 9 electrically connected to the fuel electrode 5 of one adjacent 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 has two cell stacks 11A and 11B connected in series to function as one battery. Therefore, the conductive portion 19 of the cell stack device 10 is divided into 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] <module> Next, a module 100 according to an embodiment of the present disclosure using the above-mentioned cell stack device 10 will be described with reference to Fig. 3. Fig. 3 is an external perspective view showing the module according to the first embodiment, with the front and rear surfaces, which are part of the storage container 101, removed and the cell stack device 10 of the fuel cell stored inside removed to the rear.

[0054] 3, the module 100 includes a storage container 101 and a cell stack device 10 housed in the storage container. In addition, above the cell stack device 10, a reformer 102 is disposed.

[0055] 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.

[0056] 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.

[0057] Furthermore, in the module 100 having the above-mentioned configuration, the temperature inside the module 100 during normal power generation becomes approximately 500 to 1000° C. as the gas is combusted and the cells 1 generate power.

[0058] 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.

[0059] <Module storage device> Fig. 4 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 outer case 111, the module 100 shown in Fig. 3, and auxiliary equipment (not shown). The auxiliary equipment operates the module 100. The module 100 and the auxiliary equipment are housed in the outer case 111. Note that some components are omitted in Fig. 4.

[0060] An exterior case 111 of a module accommodating device 110 shown in Fig. 4 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. 4, the auxiliary equipment accommodated in the auxiliary equipment accommodating chamber 116 is omitted.

[0061] 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.

[0062] 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.

[0063] 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.

[0064] <Performance evaluation> 2A to 2C, the difference in battery performance depending on the presence or absence of the oxygen impermeable layer 9 was evaluated. Silver (Ag) was used as the oxygen impermeable layer 9. The oxygen impermeable layer 9 was formed by applying silver paste onto the interconnector 4 of the cell 1 and baking it.

[0065] Figure 5 is a schematic diagram comparing hydrogen partial pressure during OCV. The OCV of cell 1 was measured at temperatures of 700°C, 750°C, and 800°C, and the hydrogen partial pressure in the fuel gas was calculated using the Nernst equation shown below in (1). The OCV is the voltage when no voltage or current is applied to cell 1.

[0066]

number

[0067] In Fig. 5 and Fig. 6 and Fig. 7 described later, white circles (◯) indicate cases where a cell 1 having an oxygen impermeable layer 9 is used, and black circles (●) indicate cases where a cell 1 having no oxygen impermeable layer 9 is used. As shown in Fig. 5, although the hydrogen partial pressure in the fuel gas decreases with an increase in cell temperature, the results show that the degree of this decrease is small in a cell stack device 10 in which the cell 1 has an oxygen impermeable layer 9. Note that the OCV and stack voltage in Fig. 6 and Fig. 7 are shown as relative values, with the value of 750°C indicated by the black circle (●) being set to 1.

[0068] FIG. 6 is a schematic diagram for comparing OCVs. The OCVs were measured at temperatures of 700° C., 750° C., and 800° C. for the cell 1. The OCV was measured by measuring the voltage between the positive electrode terminal 19A and the negative electrode terminal 19B shown in FIG. 2 using a data logger (GL240, manufactured by GRAPHTEC). FIG. 6 shows the OCV obtained by dividing the measured voltage between the positive electrode terminal 19A and the negative electrode terminal 19B by the number of cells 1. As shown in FIG. 6, the OCV decreases as the cell temperature increases, but at any measured temperature, the OCV was higher when the oxygen impermeable layer 9 was provided than when the oxygen impermeable layer 9 was not provided.

[0069] Figure 7 is a schematic diagram comparing battery performance. The battery performance in Figure 7 refers to the stack voltage per cell. Figure 7 shows the stack voltage measured at cell 1 temperatures of 700°C, 750°C, and 800°C using a data logger (GL240, manufactured by GRAPHTEC) and an electronic load device (FK-400L2, manufactured by TAKASAGO), and the obtained value divided by the number of cells 1. The stack voltage refers to the voltage when a voltage or current is applied to the cell stack, and specifically, when the current density is 0.4 A / cm 2The voltage between the positive electrode terminal 19A and the negative electrode terminal 19B was measured at this temperature. As shown in Fig. 7, the stack voltage per cell was higher when the oxygen impermeable layer 9 was provided than when the oxygen impermeable layer 9 was not provided, at all measured temperatures.

[0070] Thus, it was revealed that the provision of the poor oxygen permeation layer 9 in the cell 1 improved the battery performance.

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

[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. 8 is a cross-sectional view showing a cell according to the second embodiment, FIG. 9 is a cross-sectional view showing an example of a cell stack device according to the second embodiment, and FIG. 10 is an enlarged view of area A shown in FIG. 9.

[0074] 8, the cell 1A according to the second embodiment includes a support substrate 2, a pair of element portions 3, and a sealing portion 30. The support substrate 2 is columnar having a pair of opposing flat surfaces n1, n2, and a pair of arc-shaped side surfaces m connecting the flat surfaces n1, n2.

[0075] The pair of element portions 3 are located opposite each other on the flat surfaces n1, n2 of the support substrate 2. The sealing portion 30 is located so as to cover the side surface m of the support substrate 2.

[0076] 9, in the cell stack device 10A, a plurality of cells 1A extend in a longitudinal direction L from a pipe 22a through which a fuel gas flows. The cells 1A have a plurality of element portions 3 on a support substrate 2. A gas flow path 2a through which the fuel gas flows from the pipe 22a is provided inside the support substrate 2.

[0077] Moreover, the cells 1A are electrically connected to each other via a connection member 31. The connection member 31 is located between the element units 3 of the cells 1A, and connects the adjacent cells 1A. Specifically, the connection member 31 connects the air electrode 8 of the element unit 3 of one of the adjacent cells 1A to the oxygen impermeable layer 9 covering the interconnector 4 electrically joined to the fuel electrode 5 of the other cell 1A.

[0078] 10, the interconnector 4 is positioned so as to connect the element components 3 adjacent to each other in the longitudinal direction L. The poor oxygen permeation layer 9 is positioned between the interconnector 4 and the air electrode 8.

[0079] In this manner, by covering the interconnector 4 with the oxygen impermeable layer 9, oxygen is less likely to leak from the air electrode 8 through the interconnector 4 to the fuel electrode 5 and supporting substrate 2, improving the battery performance of the cell 1A. This improves the battery performance of the cell stack device 10A.

[0080] <Other Modifications> Next, other modified examples of the embodiment will be described.

[0081] 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 a "cell", a "cell stack device", a "module" and a "module containing device", but other examples may be an electrolytic cell, an electrolytic cell stack device, an electrolytic module and an electrolytic device, respectively.

[0082] 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.

[0083] As described above, the cell 1 according to the embodiment includes the element portion 3, the conductive member (interconnector 4) connected to the element portion 3, and the oxygen impermeable layer 9 covering the conductive member. This improves the battery performance.

[0084] Moreover, the cell 1 according to the embodiment further includes a support substrate 2 that supports the element section 3, and the conductive member is connected to the element section 3 and the support substrate 2. This improves the battery performance.

[0085] Moreover, the poor oxygen permeability layer 9 according to the embodiment has a lower oxygen ion permeability than the conductive member, which improves the battery performance.

[0086] Moreover, the oxygen impermeable layer 9 according to the embodiment contains at least one of a metal and a ceramic, thereby improving the battery performance.

[0087] The oxygen impermeable layer 9 according to the embodiment is made of Pt, Ag, TiO 2 and ReO 2 This improves the battery performance.

[0088] Moreover, the cell stack device 10 according to the embodiment has a cell stack 11 including a plurality of the above-described cells 1. This makes it possible to provide a cell stack device 10 capable of improving battery performance.

[0089] Moreover, the module 100 according to the embodiment includes the cell stack device 10 described above, and a storage container 101 that stores the cell stack device 10. This makes it possible to provide the module 100 with improved battery performance.

[0090] 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.

[0091] 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]

[0092] 1,1A cell 3. Element section 5 Fuel electrode 6 Solid electrolyte layer 7. Middle Tier 8 Air electrode 9. Oxygen impermeable layer 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 Connection parts 100 Modules 110 Module storage device

Claims

1. an element portion having a solid electrolyte layer; A support substrate supporting the element portion; a conductive member connected to the element portion and the support substrate; an oxygen impermeable layer covering the conductive member; Equipped with the conductive member contains a LaCrO 3 based oxide or a LaSrTiO 3 based oxide; The oxygen impermeable layer contains Ag, A cell operated at temperatures above 700°C.

2. The oxygen impermeable layer has a lower oxygen ion permeability than the conductive member. The cell of claim 1 .

3. A cell stack including a plurality of cells according to claim 1 or 2. Cell stack device.

4. The conductive member is an interconnector that electrically connects adjacent element portions to each other. The cell stack device according to claim 3 .

5. The cell stack device according to claim 3 or 4, a storage container for storing the cell stack device; A module comprising:

6. A module according to claim 5; 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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