KR101130126B1 - Electrical Collector for Solid Oxide Fuel Cell Using Segmented Flat Tube Structure - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for fabricating and installing an electrical collector of a stack for a solid oxide fuel cell, and more particularly, to an internal / external electrical connector having a high temperature stability in a segmented flat tube type fuel cell stack. It relates to a manufacturing and installation method.
The stack for a solid oxide fuel cell according to the present invention relates to a method for manufacturing a fuel cell stack in which the flow of electrons in the front and rear surfaces of the unit cell module is different because of the flat pipe split fuel cell.
In the stack for a solid oxide fuel cell according to the present invention, in a method of adhesively fixing an external electrical current collector to a cell, an intermediate connection material using a metal or ceramic and an external current collector plate using a metal material do not come into contact with high-temperature air, resulting in oxidation corrosion. This does not proceed, and also because it is not mechanically attached between the cell and the cell provides a method of manufacturing a stable fuel cell stack that does not cause electrical dropout even if the mechanical bending deformation during operation.

Description

Electrical Collector for Solid Oxide Fuel Cell Using Segmented Flat Tube Structure}

The present invention relates to a method for fabricating and installing an electrical collector of a solid oxide fuel cell stack, and more particularly, to a new internal / external electrical connector having high temperature stability in a segmented flat tube type fuel cell stack. It relates to the production and installation method of.

Fuel cells are well known as devices that generate electricity directly from fuel through chemical reactions, and there are various types depending on the internal configuration. The fuel cell operates by generating electricity generated through an anode, a cathode, an electrolyte, an anode, and an external power through an electrical collector.

The types of fuel cells are typically polymer electrolyte fuel cells (PEMFC), phosphate acid fuel cells (PAFC), carbonate fuel cells (MCFC, Molten Carbonate Fuel Cell), and solid oxide fuel cells. (SOFC, Solid Oxide Fuel Cell), etc.A variety of fuels include H ₂ , CO, CH ₄ , LNG, LPG, CH ₃ OH, Diesel, Biogas, and Coal gas. The open circuit voltage (OCV) is about 1.00 ~ 1.07V.

Solid oxide fuel cells (SOFCs) are known to have the highest energy conversion efficiency because they operate at high temperatures. Various models are developed and manufacturing processes vary depending on the structure and shape. The basic materials used are NiO / YSZ cermet in the cathode layer, Yttria-stabilized Zirconia (YSZ) or GDC (Gadolium-stabilized Ceria) in the electrolyte layer, (La, Sr) MnO ₃ , (La, Sr) ( Many material series based on Co, Fe) O ₃ and the like are used.

In addition, electrical collectors (electrical collectors) for drawing the generated electricity to the outside are used separately, and at low and low temperatures (usually 750 ° C or less), an oxide film is coated on the metal to delay oxidation corrosion, maintain electrical conductivity, and maintain a flat plate type ( It is mainly used for planar type, but it is difficult to use at high temperature due to the increase of electrical resistance by oxidation corrosion.

In the flat solid oxide fuel cell, a cathode, an electrolyte, and an anode are formed into a thin plate, alternately stacked with a separator, and sealed with a sealant to seal fuel, such as H ₂ gas, on the cathode surface. , Supply air to anode surface and generate electricity while keeping temperature around 650 ~ 1,000 ℃. Normally, the power density generated in the flat plate type is known to be high as 400 ~ 700 ㎽ / ㎠ (peak power standard, about 0.5 ~ 0.7V range), but the physical deformation of the cell due to high temperature operation, glass sealing problem, On the cathode side, problems such as increased electrical resistance and power loss due to oxidation corrosion of electrical collectors have hindered long-term high temperature stability and enlargement of cells / stacks.

The tubular solid oxide fuel cell is manufactured in the form of a fuel cell cell in the form of a tube, forming a cathode, an electrolyte, and an anode, while processing and attaching an electrical collector along the length of the tube. In this way, it is electrically connected to the next cell, and consists of a stack of several tubes bundled together. US 2007/0148523 A1 illustrates a method of electrically connecting each cylindrical cell with a wire or the like.

In a cylindrical fuel cell, the air supply is made to the inside of the tube (in this case produced as a cathode-supported type), and the fuel is supplied outside the tube. Therefore, due to the reducing atmosphere, the general metal may be used as an electrical collector. Fuel and air can be supplied in reverse as an anode-supported form, but this poses a problem for electrical connectors. Cylindrical in the form of the anode support layer is usually excellent in mechanical properties and long-term high temperature stability, but due to the excessive electrical resistance and the increase in output loss in the cell itself, most of the actual electrical output is usually lower than 200㎽ / ㎠, It is known that the manufacturing cost is high.

Patent US2008 / 0003478 A1 shows an example of a corrugated plate cell (aka delta cell) and shows an example of an air injection method and an electrical connection method between cells. These corrugated stacks also used metal electrical connections between the cells to create a reducing atmosphere to prevent metals from oxidizing. That is, the air is supplied to the inside of the channel based on the cathode-support structure and the fuel (hydrogen) is supplied to the outside, so that the metal is formed because the portion in which the electrical connector is installed is maintained in a reducing (hydrogen) atmosphere. It is an important element to act as an electrical conductor without oxidation. However, such a cathode support is difficult to manufacture. In addition, the electrical collector has a possibility of thermal deformation and degradation of the electrical contact in the cell and the electrical connector, respectively, when used for a long time at high temperature, and there are problems such as fuel inlet sealing.

Among the various types of fuel cells, flat tube type fuel cells are disclosed in US Patents US2004 / 0219411 A1, US2005 / 0164067 A1, US2008 / 0145711 A1, Japanese Patent No. 2003-282132, and the like. In the flat tube type, the cell is inserted into the port supporting the cell, and glass or the like is added thereto to melt the gas sealing.In the case of collecting electricity generated between the cells, a metal plate or the like is inserted in close contact between the cells. . In addition, according to US Patent US2004 / 0219411 A1, even in the flat tube type, the electrical collectors between the cells are shown to be made of metal. However, a separator is formed by coating a conductive ceramic material (eg, (La, Sr) CrO ₃ based and (La, Sr) TiO ₃ based) that is stable at the same time in an oxidizing and reducing atmosphere on one surface of a unit cell support). It was used as an internal interconnector to play a role and an electrical conducting layer. That is, the electrical collector (electric collector) for the electrical connection between each cell uses an oxide coated metal material.

The metal used as an electrical collector may use a metal that is stable at high temperatures, such as precious metals (platinum, gold, etc.), but it is expensive. Therefore, p- such as La ₂ O ₃ , which has a high temperature metal plate directly, or exhibits oxidation-inhibiting ability on its surface, or (La, Sr) MnO ₃ , (La, Sr) CoO ₃ , which has excellent electrical conductivity at high temperatures, can be used. It is mentioned to increase the electrical contact and slow down the oxidation corrosion rate by coating a type conductive ceramic coating.

However, a metal plate coated with a high temperature metal material or an anti-corrosion oxide, etc., also rapidly increases oxidation corrosion and electrical resistance at a high temperature of 750 ° C. or higher, thus making it difficult to use for high temperature long-term operation. In addition, when the electrical collector is used in close contact with the cells, the heat deformation progresses in the neighboring cell body and the electrical connector as the time passes at a high temperature, and the direction thereof also changes, and thus, the cell and the electrical connector. The problem of loose contact or falling off of the contact point, leading to partial shortage of the cell, increases local ohmic loss, and thus increases the cell thermal stress.

On the other hand, the segmented flat tube type (segmented flat tube type) is introduced in US 7,399,546 B2, Korean Patent 10-2006-0030906, 特 2006-172925 and the like. In general flat panel, cylindrical, and corrugated plate type, 1 volt of voltage (OCV standard) occurs in a unit cell, whereas in split flat tube type, the output voltage increases with the number of cells divided in one cell support. However, the relative current generated by one support is small. The small amount of current leads to the effect of increasing the power efficiency due to the low ohmic loss in the cell.The higher the generated voltage, the higher the voltage to the utility voltage (eg 220Volt), so it is more power efficient than the general flat type. This can be high and can also have the effect of excluding the use of a metallic electrical collector to draw electricity externally.

As for the method of installing the split flat tubular cell module as a stack, install the cell using various accessories in the cell / stack installation port as in the general flat tubular type, and seal it with glass or the like (特)開 2003-282107), a method of connecting directly with little use of accessories (特 開 2006-172925), and the like.

However, although the electrical connection between the divided cells in the segmented flat tube type SOFC is mentioned through the interconnector layer coating such as LaCrO ₃ , the cell module (the whole cell formed on one support) There is no mention of a method of drawing electricity from an electric collector or an electrical collector. In case of attaching electrical collector to one side of cell module and connecting them in parallel as in general flat tube type, contact with electrical connector due to cell deformation during long time operation at high temperature above 700 ℃ Problems remain, such as reduction and increased oxidative corrosion and electrical resistance of metal interconnects.

The problem to be solved by the present invention is a novel electrical connection method for drawing the electricity generated from each cell to the outside of the flat or tubular cells consisting of a cathode (fuel electrode), an electrolyte, an anode (air electrode) formed on the non-electrode support The present invention provides a method for long-term stable operation of cells and stacks at high temperatures.

Another object of the present invention is to provide a method of manufacturing and installing a new electrical connection member that can solve the above problems.

In order to solve the above problems, the present invention is to prepare a unit cell laminated the negative electrode, the electrolyte, the positive electrode and the internal connection on the front and back of the flat non-electrode support, respectively, to form a stack consisting of a plurality of unit cell modules In an embodiment, an intermediate current collector for connecting the front and rear surfaces of the unit cell support and an external current collector plate for electrically connecting the plurality of unit cell modules may be formed.

In the present invention, a porous structure in the form of a flat tube in which a plurality of fuel flow channels exist in the longitudinal direction inside the flat tubular support is used, and air / oxygen flows to the outer surface of the structure.

In the present invention, an electrode / electrolyte assembly (EEA) is formed to allow electrons to flow from the bottom to the top and the top to the bottom of the unit cell module, respectively.

In the practice of the present invention, in order to connect the front and the back of the unit cell module in series to form an intermediate connecting material on the top to block the hydrogen inside the unit cell, electrically connecting the front and back of the unit cell and the surface of the intermediate connecting material Other materials can be coated on the air / oxygen to block electrical connections that are stable against oxidation corrosion.

In the practice of the present invention, by forming a stack at the lower end of the unit cell module and manufacturing a cell port for supplying hydrogen, by forming an external collector plate for electrically connecting the unit cells inside the cell port to block air It is possible to prevent oxidation of the current collector plate under a reducing atmosphere, and since the existing electrical current collector is fixed to each cell assembly separately from the mechanical contact between the cell and the cell assembly, it is independent of the mechanical shape change of the cell assembly. To provide good electrical contact at all times.

In another embodiment of the present invention, an electrode / electrolyte assembly (EEA) is formed to allow electrons to flow in the horizontal direction instead of the up / down direction on the front and rear surfaces of the flat non-electrode support.

In another embodiment of the present invention, when the flow of electrons in the front and rear of the unit cell module flows in the horizontal direction, intermediate connecting members are formed at both ends of the horizontal direction, respectively, so that the front and the rear may be connected in series.

In another embodiment of the present invention, a tubular non-electrode support may be used in place of the flat non-electrode support to form a unit cell module, in which case hydrogen flows into the tube and air / oxygen flows to the outside. It is.

In another embodiment of the present invention, an electrode / electrolyte assembly (EEA) is formed to allow electrons to flow up and down in the tubular non-electrode support.

In another embodiment of the present invention, the intermediate connector may be formed on the upper portion of the unit cell module so that the electrons flow in the tubular non-electrode support in the up and down directions (pipe length direction), respectively.

In another embodiment of the present invention, in the case of the tubular non-electrode support, an electrode / electrolyte assembly (EEA) may be formed such that an electron flows in a horizontal direction instead of up / down (tube length direction). .

In another embodiment of the present invention, when the flow of electrons in the tubular non-electrode support is in the horizontal direction, two intermediate connectors may be formed on the outer surface of the tubular support so as not to be electrically connected.

In another aspect, the present invention uses a non-electrode support to form an anode (fuel electrode), an electrolyte (electrolyte), a cathode and an inter-connector thereon In the method of manufacturing a cell assembly formed with a plurality of unit cells, and installing and operating an external electrical current collector in the manufactured cell assembly, the external electrical current collector is formed inside the cell installation port so as not to be exposed to an air atmosphere Provide a way to.

In the present invention, the cell assembly may be formed by dividing 2-100 granular unit cells in a support, and the unit cells may be formed by dividing in a vertical or horizontal direction with respect to the support channel.

In the practice of the present invention, when the flat tube split unit cell is formed perpendicular to the direction of the channel formed up and down, the intermediate connecting member is formed on the upper surface of the electrode support to connect in series so that the flow direction of electrons in the double-sided unit cell is different. Can be. In another embodiment, the support may be a tubular support.

In another embodiment of the present invention, when the flat tube split unit cell is formed parallel to the direction of the channel formed up and down, the intermediate connecting member connected to the external electrical current collector at both corners of the electrode support may be buried. In another embodiment of the present invention, the support may be a tubular support.

In another aspect, the present invention provides a coating of an anode (electrode), an electrolyte (electrolyte), a cathode and an inter-connector thereon using a non-electrode support. To fabricate a cell assembly in which a plurality of unit cells are formed, 1-300 cell assemblies are installed in one manufactured cell installation port, and each cell assembly is connected to an external electrical collector to obtain a high temperature. In the long term operation in the cell installation port, the internal electrical current collector is attached to the cell installation port, and the respective cell assemblies are connected, and the internal electrical current collector and the external electrical current collector are connected to each other. It is made by the method characterized by installing so that it may not expose to atmosphere.

In the practice of the present invention, the sealing material is glass, ZrO ₂ , TiO ₂ , ceramic or a variant thereof, and it is preferable that the melting point is 500 to 1,000 ° C. without electricity, and the sealing temperature is 500 to 1,000 ° C., atmosphere Is the oxygen partial pressure of 10 ^-20 ~ 10 ⁰ atm.

In the practice of the present invention, it is preferable that the intermediate connector further coats a high conductive layer on the intermediate connector in order to increase the electrical conductivity.

In the practice of the present invention, the internal connection material is used by mixing a component selected from a noble metal or transition metal and oxide in a weight ratio of 20:80 to 80:20, the thermal expansion coefficient is 8x10 ^-6 ~ 13x10 ^-6 / under reducing conditions It is preferable that it is ° C.

In the practice of the present invention, the external electrical current collector is a metal electrical connection wire is installed in the protective tube, the metal electrical connection wire is selected from at least one of copper, stainless steel, inconel, ferrochrome, platinum, gold, the metal It is recommended that at least one of glass, MgO, Al ₂ O ₃ , ZrO ₂ , TiO ₂ , and ceramic be filled between the connecting line and the protective tube.

In the practice of the present invention, when the cell assembly and the electrical current collector are connected and sealed at the port, a thermal expansion coefficient of ceramic material having a thermal expansion coefficient of 8x10 ^-6 to 13x10 ^-6 / ° C and a thickness of 0.01 to 5 mm is provided between the cell assembly. It is good to use.

According to another aspect of the present invention, a fuel cell stack having a plurality of unit cells composed of a negative electrode, an electrolyte, a positive electrode, and an internal connection member formed on a surface of a non-electrode support is divided vertically or horizontally in a channel direction of the support. It is inserted and installed in the cell installation port installed inside, and the electrical current collector provides a solid oxide fuel cell, characterized in that sealed to block the air.

In the present invention, the non-electrode support is preferably a flat non-electrode support or a tubular electrode support, and a single or multiple fuel cell stack may be installed in one cell installation port.

In the fuel cell stack fabricated by the present invention, in the method of adhesively fixing an external electrical current collector to a cell, oxidative corrosion is not caused by the intermediate connector using metal or ceramic and the external current collector using metal material not contacting with high temperature air. This does not proceed, and also because it is not mechanically attached between the cell and the cell provides a method of manufacturing a stable fuel cell stack does not occur electrical dropout even if the cell mechanically deformed deformation.

FIG. 1 is a view illustrating a general negative electrode support type flat tubular cell, in which an electrical current collector 18 is inserted between the cell 10 and the cell 10 to provide electrical connection between the cells and to the outside. It is a figure which shows the model drawing which draws electricity. FIG. 1A is a plan view, FIG. 1B is a front view, and FIG. 1C is a side view.
In FIG. 2, the negative electrode 24, the electrolyte 25, the positive electrode 26, and the internal connecting member 27 are alternately formed on the non-electrode support 21 having a flat tubular shape to divide a plurality of unit cells on one support. It is a figure which shows the formed cell assembly. FIG. 2A is a front view, FIG. 2B is a side view, and FIG. 2C is a side cross-sectional view.
In FIG. 3, the cell assembly 30 is a novel method of the present invention, in which an external electric current collector 33 (+) and (33) (-) are installed into the port 36. Figure is an illustration. 3A is a front view, FIG. 3B is a side view, and FIG. 3C is a side sectional view.
4 is a schematic diagram of installing a plurality of cell assemblies 30 in a stack.
5 is an exemplary view of a cell assembly in which the unit cell is formed parallel to the fuel H ₂ flow direction.

Examples of the present invention are shown in FIGS. FIG. 1 is a view illustrating a general negative electrode support type flat tubular cell, in which an electrical current collector 18 is inserted between the cell 10 and the cell 10 to provide electrical connection between the cells and to the outside. A schematic diagram of the electric drawing is shown. In the cell schematic, hydrogen is supplied through a channel 12, the outside of one side of the cell 10 is coated with an anode (air electrode) 16 and the other side with an internal electrical interconnector 17 coated thereon. The negative electrode, the negative electrode support 14 and the electrolyte 15 are formed. The electrical current collector 18 is installed by processing a metal material and mechanically adhering between the cells 10.

In FIG. 2, the negative electrode 24, the electrolyte 25, the positive electrode 26, and the internal connecting member 27 are alternately formed on the non-electrode support 21 having a flat tubular shape to divide a plurality of unit cells on one support. The cell assembly formed is shown. The cell assembly 20 has an external electrical current collector 31 (+) and 31 (-) exposed to air, and are in contact with each other through the internal connector 27 and the electrical lead-out contact 28. have. The flow direction of the electrons on both sides of the cell assembly 20 is the same, and the external electric current collectors 31 (+) and (31) (-) are disposed at the top and bottom of the cell assembly. Each is connected to draw electricity generated in the cell assembly to the outside.

In FIG. 3, the cell assembly 30 is a novel method of the present invention, in which an external electric current collector 33 (+) and (33) (-) are installed into the port 36. To illustrate. A plurality of unit cells are formed on one side of the cell assembly in the direction of the negative electrode 24, the electrolyte 25, and the positive electrode 26, and vice versa on the other side of the cell assembly. Each unit cell is connected via an internal connection material 27, and the unit cells on both sides are electrically connected through an intermediate connection material 29 at the top of the cell assembly, so that the flow direction of electrons is reversed as a whole. The intermediate connecting member is formed on the cell support 21 and is composed of a ceramic-based dense layer 29A that is conductive so as to prevent leakage of hydrogen and oxygen inflow from the inside. LaCrO ₃ , (La, Sr) CrO ₃ Or a variant thereof or the like, or a thin film 29A such as Pt, Ag, Au, or the like may be formed, but is not limited thereto. Further, on the dense film, p-type perovskite-based oxides (29) such as (La, Sr) MnO ₃ , (La, Sr) (Co, Fe) O _3, and complex oxides such as CoMnO ₃ (29) are further coated. Is more effective. The coating film may be a thin film composed of Pt, Ag, Au, or the like instead of the composite oxide.

The cell assembly 30 is installed in the cell port 36 and connected to the external current collectors 33 (+) and 33 (-) to collect electricity. The external current collectors 33 (+) and 33 (-) are connected to the cell ports ( In 36, a seal 39 is used to seal and isolate from the outside air. A conductive coating layer 23 may be used at the bottom of the cell assembly 30 to increase electrical current collection, which is a structurally stable and conductive ceramic (La, Sr) CrO ₃ , (La, Sr) even in a reducing atmosphere. TiO ₃ or a variant thereof may be used, or Pt, Ag, Au, etc. may be used, but is not limited thereto. The external current collectors 33 (+) and 33 (-) are drawn out of the cell / stack from the cell port 36. Copper, stainless steel, ferrochrome, inconnel, nickel, etc. may be used as the material, and the protection tube 35 is protected on the outside, and inside the protection tube such as glass, MgO, Al ₂ O ₃ , ZrO ₂ , TiO ₂ , etc. It is filled with the material to suppress air inflow and hydrogen leakage.

4 shows a schematic diagram of installing a plurality of cell assemblies 30 in a stack. The cell ports have external collector plates 32 (+) and 32 (-) installed and are connected to external collectors 33 (+) and 33 (-), and the external collector plates 32 (+) and 32 (-) are cell assemblies. It is connected to the conductive coating film 30 coated on the bottom of the (30). The conductive coating film may be installed as shown in FIGS. 4 c1 and 4 c2 according to the coated portion, and in each case, the structures of the external current collector plates 32 (+) and 32 (-) may vary, but are not limited thereto. Do not. In addition, when the cell port 36 is made of a metal material, it is also necessary to insert an insulating separator 32A between the cell port 36 and the external current collector plate 32 to prevent electrical contact.

The cell spacing plate 38 may be used between the cell assemblies 30 to adjust the spacing between the cell assemblies, using a non-conductive ceramic material, with a coefficient of thermal expansion of 8x10 ^-6 to 13x10 ^-6 / ° C. Preferably, a ceramic material having a thickness of ¹¹ × 10 ⁻⁶ to 12 × 10 ⁻⁶ / ° C., and a thickness of 0.01 to 5 mm may be used.

FIG. 5 shows an example of the cell assembly 40 in which the unit cell is parallel to the fuel H ₂ flow direction, and is configured as a stack when a plurality of cell assemblies 40 are installed in the cell port 56. Can be. Grooves 43 for forming the intermediate connecting member 51 may be formed at both ends of the cell support 41, and the negative electrode 44, the electrolyte 45, and the positive electrode 46 may be formed in the cell support 41. One or more states in which the internal connecting member 47 is connected between each unit cell may be installed, but the configured form is not limited thereto. Intermediate connector 51 may be a metal wire, it is important to have a similar coefficient of thermal expansion to the cell support 41, and transition metals such as Ni, Co, Cu, Fe and ZrO ₂ , Al ₂ O ₃ , TiO ₂ , The mixture may be used in combination with an oxide such as MgO, but the ratio may be used in the range of 30:70 to 70:30, more preferably 40:60 to 60:40 (weight ratio). Coating layer 50 (+), 50 (-) to protect the intermediate connector 51 is additionally formed on the outside of the intermediate connector 51, a stable conductive oxide such as LaCrO ₃ system may be used, and LaMnO ₃ , P-type oxides such as LaCoO ₃ , LaFeO _3, etc., or high-temperature conductive oxides 49 (+) and 49 (-) such as CoMnO ₃ may be coated again.

One or more assemblies 40 are installed in the cell port 56, are connected to the outer current collector plates 52 (+), 52 (-) and again to the external connectors 53 (+), 53 (-), and then the sealing material. The cell / stack is completed using (59) to prevent air ingress and hydrogen leakage. When the cell port 56 is a metal material, it is also necessary to insert an insulating separator 58 between the cell port 56 and the external current collector plate 52 to prevent electrical contact.

Claims (20)

A cell assembly in which a plurality of unit cells are formed by using a non-electrode support to form an anode (electrode), an electrolyte, an anode, and an inter-connector thereon. And manufacturing an external electric current collector in the manufactured cell assembly, wherein the external current collector is formed inside the port for installing the cell such that the external current collector is not exposed to an air atmosphere. The method of claim 1, wherein the cell assembly is a cell assembly which divides the unit cell into less than 2-100 granular cells on one support, the unit cell is formed perpendicular to the longitudinal direction. The method of claim 2, wherein the cell assembly is a cell of the flat-pipe split fuel cell is formed perpendicular to the longitudinal direction, the direction of flow of electrons between each cell in the opposite direction on both sides of the support, the upper surface of the electrode support Connecting cells on both sides using an intermediate connector. 4. The method of claim 3, wherein the cell assembly is a tubular support. The method of claim 1, wherein the unit cell is formed horizontally with respect to the longitudinal direction. The method of claim 1, wherein the cell assembly is a cell of the flat-pipe split fuel cell is formed parallel to the longitudinal direction, it is to install the intermediate electrical connector in the buried type on both corners of the support and to connect it to the external electrical current collector How to feature. 6. The method of claim 5, wherein the cell assembly connects a fuel cell stack whose support is tubular. The method of claim 1, wherein the non-electrode support is used to coat an anode, a fuel electrode, an electrolyte, an anode, and an inter-connector thereon. Fabricate a cell assembly in which unit cells are formed, install 1-300 cell assemblies in one manufactured cell installation port, connect each cell assembly with an external electrical collector, and It is operated, and attaching an internal electrical current collector to the cell installation port to connect to each cell assembly, and connect the internal electrical current collector and the external electrical current collector, and the internal electrical current collector and the external electrical current collector are connected to an air atmosphere. Method to install inside the cell installation port so as not to expose. 9. The method of claim 8, wherein the electrical current collector seals the porter for cell installation with a seal outside the port to block external air inflow. 10. The method of claim 9, wherein the sealant is glass, ZrO ₂ , TiO ₂ , ceramic, or a variant thereof, and the melting point is 500 to 1,000 ° C. without electricity. 4. The method of claim 3, wherein the intermediate interconnect further coats a high conductive layer over the intermediate interconnect to increase electrical conductivity. The method of claim 6, wherein the internal connection material is used by mixing a component selected from a noble metal or transition metal and oxide in a weight ratio of 20:80 to 80:20, the thermal expansion coefficient of 8x10 ^-6 ~ 13x10 ^-6 / ℃ under reducing conditions Method characterized in that. According to claim 1 or 8, wherein the external electrical current collector is a metal electrical wire is installed in the protective tube, the metal electrical wire is selected from at least one of copper, stainless steel, inconel, ferrochrome, platinum, gold, Between the metal connecting wire and the protective tube, characterized in that the glass, MgO, Al ₂ O ₃ , ZrO ₂ , TiO ₂ , characterized in that at least one selected from the ceramic filling. The method of claim 9, wherein the sealing temperature is 500 ~ 1,000 ℃, the atmosphere is characterized in that the oxygen partial pressure of 10 ^-20 ~ 10 ⁰ atm. 9. The method according to claim 1 or 8, wherein the support of the solid oxide is flat or tubular in connecting the cell assembly and the electrical current collector and sealing in the port. The ceramic material according to claim 1 or 8, wherein the coefficient of thermal expansion is 8x10 ^-6 to 13x10 ^-6 / deg. C and a thickness of 0.01 to 5 mm between the cell assembly when the cell assembly and the electrical current collector are connected and sealed at the port. Using a retaining plate. In manufacturing a unit cell in which the negative electrode, the electrolyte, the positive electrode, and the internal connection material are laminated on the front and the back of the flat non-electrode support, respectively, and forming a stack composed of a plurality of unit cell modules, the front and the back of the unit cell support are Stack for fuel cells formed by intermediate connectors for series connection. The stack of claim 17, wherein the unit cell is formed perpendicular to a channel of the support. delete On the surface of the support, a plurality of unit cells composed of a cathode, an electrolyte, an anode, and an internal connection material are divided into vertical or horizontal directions in the channel direction of the support, and a fuel cell stack is inserted and installed in a cell installation port having an external electrical current collector installed therein. And the electrical current collector is sealed to block air.

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