KR20110023324A - Solid oxide fuel cell and a method of manufacturing the same - Google Patents

Abstract

PURPOSE: A solid oxide fuel cell and a method for manufacturing the same are provided to ensure excellent performance and high power density per unit volume by connecting unit cells on a plurality of planes of prismatic tubular support in serial. CONSTITUTION: A solid oxide fuel cell includes: a prismatic tubular support(110) in which the outer surface thereof is a plurality of planes; a plurality of unit cells(120) formed on the plurality of planes; an inner connection material(130) connecting a plurality of unit cells in serial; and an outer connection material(140) connecting an current collector to the unit cells connected in serial.

Description

Solid oxide fuel cell and its manufacturing method {SOLID OXIDE FUEL CELL AND A METHOD OF MANUFACTURING THE SAME}

The present invention relates to a solid oxide fuel cell and a method of manufacturing the same.

A fuel cell is a device that directly converts chemical energy of fuel (hydrogen, LNG, LPG, etc.) and air into electricity and heat by an electrochemical reaction. Unlike the existing power generation technology that takes fuel combustion, steam generation, turbine driving, and generator driving process, it is a new concept of power generation technology that is not only highly efficient and does not cause environmental problems because there is no combustion process or driving device. Such a fuel cell has almost no emissions of air pollutants such as SOx and NOx, generates little carbon dioxide, and is a pollution-free power generation. It has advantages such as low noise and no vibration.

There are various types of fuel cells such as phosphate fuel cell (PAFC), alkaline fuel cell (AFC), polymer electrolyte fuel cell (PEMFC), direct methanol fuel cell (DMFC), and solid oxide fuel cell (SOFC). Medium solid oxide fuel cell (SOFC) has high power generation efficiency due to low overvoltage and low irreversible loss based on activation polarization. In addition, it is possible to use not only hydrogen but also carbon or hydrocarbon-based fuels, so that the fuel selection range is wide and the reaction rate at the electrode is high, thus eliminating the need for expensive precious metals as electrode catalysts. In addition, the heat released as a result of the generation is very high in temperature and high in value. The heat generated from solid oxide fuel cells is not only used for reforming fuel, but also for industrial or cooling energy sources in cogeneration. Therefore, solid oxide fuel cells are an essential power generation technology for entering the hydrogen economy society in the future.

Looking at the basic operation principle of the solid oxide fuel cell (SOFC), the solid oxide fuel cell is basically a device that generates by the oxidation reaction of hydrogen and CO, the electrode reaction in the anode and the cathode as shown in Equation 1 below This is going on.

Fuel electrode: H _{2 ^{+ O 2 - → H 2 O}} + 2e -

_{^{CO + O 2 - → CO 2}} + 2e -

^{_{Cathode: O 2 + 4e - → 2O}} 2 -

Prereaction: H ₂ + CO + O ₂ → H ₂ 0 + CO ₂

That is, electrons reach the cathode via an external circuit, and at the same time, oxygen ions generated from the cathode are transferred to the anode through the electrolyte, whereby hydrogen or CO combines with oxygen ions to form electrons, water, or CO ₂ . Create

1A to 1B are perspective views of a conventional solid oxide fuel cell.

1A to 1B, solid oxide fuel cells are classified into flat solid oxide fuel cells 10 and tubular solid oxide fuel cells 20.

The planar solid oxide fuel cell 10 is stacked in order of the separator 11, the unit cell 13, and the separator 11. The planar solid oxide fuel cell 10 has higher performance and power density than the tubular solid oxide fuel cell 20 and the manufacturing process is very simple. In particular, since the electrode and the electrolyte are manufactured on a plane through tape casting, doctor blade, screen printing, etc., fuel cell manufacturing cost is low.

However, the planar solid oxide fuel cell 10 requires a large external manifold for supplying and discharging the reaction gas, and this structure requires strict gas sealing. Therefore, the sealing member 15 for gas sealing should be disposed between the separator 11 and the unit cell 13. However, since the sealing member 15 is not stable at high temperatures, cracks are generated. In addition, mechanical compression sealing, cement sealing, glass sealing, glass and ceramic composite sealing technology for gas sealing has been developed, but there are still many problems. Mechanical compression seals result in uneven stress distribution in ceramic components, causing cracks, and cement and glass seals adversely affect fuel cells by reacting with cell materials at high temperatures.

The tubular solid oxide fuel cell 20 is stacked outside the cathode support 21 in the order of the electrolyte 23, the anode 25, and a connecting member 27 for connecting with other unit cells is disposed on the cathode support 21. Is formed. Unlike the planar solid oxide fuel cell 10, the tubular solid oxide fuel cell 20 does not need a separate gas seal and thus has long-term durability and is stable to thermal shock.

However, since it takes up a large volume when forming a bundle by connecting unit cells, it has a relatively low performance and power density. In addition, since the outer circumferential surface of the cathode support 21 is curved, there is a problem in that uniform electrode and electrolyte coating is more difficult than the planar solid oxide fuel cell 10.

Accordingly, the present invention has been made to solve the above problems, an object of the present invention by adopting a polygonal tubular support consisting of a plurality of planes of the outer peripheral surface of the solid oxide having a high performance and power density without the need for gas sealing It is to provide a fuel cell and a method of manufacturing the same.

A solid oxide fuel cell according to a preferred embodiment of the present invention includes a polygonal tubular support having an outer circumferential surface consisting of a plurality of planes, a plurality of unit cells each formed on the plurality of planes, an internal connection member connecting the plurality of unit cells in series, and It comprises an external connection material for connecting the plurality of unit cells connected in series with the current collector.

Here, the plurality of unit cells, a plurality of first electrodes formed on each of the plane except for the edge of the tubular support, a plurality of electrolyte selectively formed on the outside of the first electrode, and selectively on the outside of the electrolyte It characterized in that it comprises a plurality of second electrodes formed.

The external connecting member may connect one end of the first electrode and the other end of the second electrode with current collectors on both sides of the tubular support, and the internal connecting member may be configured as the working member. The one end of the first electrode and the other end of the second electrode formed on both sides with respect to the edge of the tubular support except for the corner is connected, characterized in that the gas is impermeable.

In addition, the electrolyte is characterized in that the other end is extended in the direction of the tubular support to apply the other side surface of the first electrode, the second electrode is characterized in that the other end is extended in the direction of the tubular support to apply the other end of the electrolyte. It is done.

In addition, one end of the second electrode is characterized in that it is formed so as to be spaced apart from the internal connection member or the external connection member.

The first electrode may be a fuel electrode, and the second electrode may be an air electrode.

The first electrode may be an air electrode, and the second electrode may be a fuel electrode.

In addition, the tubular support is characterized in that the outer peripheral surface is formed of three, four, five or six planes.

In addition, the tubular support is characterized in that the inner peripheral surface is a cylindrical consisting of a curved surface.

In addition, the tubular support is characterized in that formed of an insulating material.

In addition, the tubular support is characterized in that formed of a porous material.

In addition, the tubular support is characterized in that formed of an alumina-based ceramic material.

In addition, the edge of the tubular support is characterized in that the rounded process.

A method of manufacturing a solid oxide fuel cell according to a preferred embodiment of the present invention includes the steps of (A) preparing a polygonal tubular support having an outer circumferential surface of a plurality of planes, and (B) forming a plurality of unit cells in each of the plurality of planes. And (C) comprising an internal connection member connecting the plurality of unit cells in series and an external connection member connecting to the current collector.

Here, the step (B), (B1) forming a plurality of first electrodes in each of the plane except the edge of the tubular support, (B2) optionally a plurality of electrolytes on the outside of the first electrode And (B3) optionally forming a plurality of second electrodes on the outside of the electrolyte.

In addition, the step (C) comprises the step of providing an external connection member for connecting one end of the first electrode and the other end of the second electrode formed on both sides with respect to one edge of the tubular support and the current collecting means, and the work And an internal connection member connecting one end of the first electrode and the other end of the second electrode formed on both sides of the tubular support except for the edge.

Further, in the step (B), the plurality of unit cells are tape casting, spray coating, dip coating, screen printing, doctor blade method. and a doctor blade, an electrochemical vapor deposition method, a sputtering method, an ion beam method, an ion implantation method, or a plasma spray method.

The first electrode may be a fuel electrode, and the second electrode may be an air electrode.

The first electrode may be an air electrode, and the second electrode may be a fuel electrode.

The features and advantages of the present invention will become more apparent from the following detailed description based on the accompanying drawings.

Prior to that, terms and words used in the present specification and claims should not be construed in a conventional and dictionary sense, and the inventor may properly define the concept of the term in order to best explain its invention It should be construed as meaning and concept consistent with the technical idea of the present invention.

According to the present invention, the unit cells are formed on a plurality of planes of the polygonal tubular support and connected in series to have excellent performance and high power density per unit volume, and maintain a high voltage during current collection to reduce the amount of power loss due to electrical resistance. It can be effected.

In addition, according to the present invention, by forming the electrode and the electrolyte on the flat surface rather than curved surface, the manufacturing process is simplified and the manufacturing cost is low, but since the tubular support is basically used, there is no need for gas sealing, so it is excellent in long-term durability and strong against heat shock. There is this.

In addition, according to the present invention, the outer circumferential surface of the tubular support can be manufactured in various shapes, and through this, there is an effect of producing a bundle having an optimal power density per unit volume.

In addition, according to the present invention, the tubular support is made of an alumina (Al ₂ O ₃ ) -based ceramic material, and thus, there is an advantage in that price competitiveness can be secured compared to a conventional tubular support.

The objects, specific advantages and novel features of the present invention will become more apparent from the following detailed description and the preferred embodiments associated with the accompanying drawings. In adding reference numerals to the components of each drawing, it should be noted that the same components as much as possible, even if displayed on the other drawings. In addition, O ₂ shown in the drawing And H ₂ is only an example for explaining the operation of the fuel cell in detail does not limit the type of gas supplied to the anode or cathode. Also, the terms "one end", "other end", "other side", "edge", "first", "second", "external", etc. are used to distinguish one component from another component. It is to be understood that the components are not limited by the above terms. In the following description of the present invention, if it is determined that the detailed description of the related known technology may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

6 is a perspective view of a solid oxide fuel cell according to an embodiment of the present invention, Figure 7 is an enlarged view of the main portion of the solid oxide fuel cell according to an embodiment of the present invention, Figures 8 to 10 are the present invention Perspective view of various solid oxide fuel cells in accordance with one preferred embodiment of the present invention.

6 to 10, the solid oxide fuel cell according to the present embodiment has a polygonal tubular support 110 having an outer circumferential surface of a plurality of planes, a plurality of unit cells 120 formed on a plurality of planes, and a plurality of planes. The internal connection member 130 for connecting the unit cells 120 in series and the external connection member 140 for connecting the plurality of unit cells 120 connected in series with the current collector.

The solid oxide fuel cell according to the present invention can manufacture various types of solid oxide fuel cells as shown in FIGS. 6, 8, 9, and 10. 6 is a solid oxide fuel cell 100 using a hexagonal tubular support, FIG. 8 is a solid oxide fuel cell 200 using a triangular tubular support, and FIG. 9 is a solid oxide fuel cell 300 using a square tubular support. 10 is a solid oxide fuel cell 400 using a pentagonal tubular support. As such, the solid oxide fuel cell may be manufactured in various forms according to the shape of the tubular support 110.

The outer peripheral surface of the tubular support 110 may be composed of three (see FIG. 8), four (see FIG. 9), five (see FIG. 10) or six (see FIG. 6) planes. However, this is merely an example, and the above-mentioned number N of planes may include all natural numbers from 3 or more to less than infinity (3 ≦ N <∞). In addition, since the number N of the plane described above determines the number of unit cells 120 connected in series in the solid oxide fuel cell, the number N of the plane is determined in consideration of the required voltage. In addition, an inner connection member 130 is provided at an edge where a plurality of planes contact each other, and it is preferable to round the corners to prevent cracking of the inner connection member 130.

On the other hand, gas (fuel in this embodiment) should be supplied inside the tubular support 110. Therefore, in order to increase the coupling reliability with the manifold (mainfold) that is the gas supply means and to prevent the outflow of gas from the coupling portion, the inner circumferential surface 119 of the tubular support 110 is preferably a cylindrical having a curved surface. In addition, the tubular support 110 is preferably formed of a porous material because the gas (fuel in the present embodiment) to be supplied to the first electrode (fuel electrode 121 in the present embodiment) must be delivered.

In addition, since a plurality of unit cells 120 are connected in series on a plurality of planes, the tubular support 110 may be formed of an insulating material in order to prevent the unit cells 120 from being shorted to each other. Accordingly, the tubular support 110 may be molded using a ceramic material including commonly used Yttria stabilized zircornia (YSZ), and more preferably, relatively inexpensive alumina (Al ₂ O ₃ ) -based ceramics. By molding using materials, price competitiveness can be secured.

In the present embodiment, the first electrode is defined as the anode 121 and the second electrode is defined as the cathode 125, and the unit cell 120 will be described in detail below.

The unit cell 120 is a basic unit for producing electrical energy and includes a fuel electrode 121, an electrolyte 123, and an air electrode 125. As described above, since the outer circumferential surface is formed of a plurality of planes, the tubular support 110 forms a plurality of unit cells 120 on the plurality of planes. Therefore, the solid oxide fuel cell according to the present invention, unlike the prior art, does not form a unit cell integrally on the outer circumferential surface of the support, and forms an independent unit cell 120 on each plane 111 of the tubular support 110. Let's do it.

Looking at the formation process of the unit cell 120 in more detail, a plurality of anodes 121 are formed in each plane except the edge of the tubular support 110, and a plurality of electrolytes 123 selectively outside the fuel electrode 121 ) Is formed, and a plurality of cathodes 125 are selectively formed outside the electrolyte 123. The anode 121 receives fuel from the tubular support 110, and the cathode 125 receives air from the outside of the fuel cell to generate electrical energy.

On the other hand, since the electrolyte 123 is very dense and has a gas impermeability, the fuel delivered from the inside of the tubular support 110 to the anode 121 is prevented from leaking to the outside. In addition, at the edge where the electrolyte 123 is not formed, the internal connection member 130 to be described later prevents the outflow of gas.

The internal connection member 130 serves to connect a plurality of unit cells 120 formed in the tubular support 110 in series, and the external connection member 140 connects the plurality of unit cells 120 connected in series with a current collector. Play a role. In the solid oxide fuel cell according to the present invention, unlike the conventional solid oxide fuel cell, since a plurality of unit cells 120 exist in one tubular support 110, an internal connection member 130 is employed to connect them in series. In order to connect the plurality of unit cells 120 directly connected by the internal connection member 130 with an external current collector, an external connection member 140 is employed.

Referring to FIG. 7, the outer connecting member 140 and the inner connecting member 130 will be described in more detail. The outer connecting member 140 selects an arbitrary corner 115 of the tubular support 110 to form the one corner 115. It is electrically connected to one end 221 of the anode and the other end 225 of the cathode formed on both sides as a reference. In addition, the external connection member 140 may be manufactured in a protruding shape to increase the convenience of the current collector and the connection, but is not limited thereto, and may be manufactured in various shapes in consideration of the shape of the bundle to be formed. In this case, when the external connector 140 connected to one end of the anode 221 is in contact with one end of the cathode 125, a short circuit occurs, so that one end of the cathode 125 may be formed to be spaced apart from the external connector 140. Do.

On the other hand, the inner connector 130 electrically connects one end 321 of the anode and the other end 325 of the cathode formed on both sides with respect to the corners excluding the corners 115 where the outer connector 140 is formed. That is, the internal connection member 130 is formed at the corners excluding the corners 115 and is a means for connecting the plurality of unit cells 120 in series. At this time, a short circuit occurs when the internal connecting member 130 connected to one end of the anode 321 contacts one end of the cathode 125. Therefore, it is preferable to form one end of the cathode 125 to be spaced apart from the internal connection member 130.

In addition, a short circuit occurs when the internal connection member 130 connected to the other end 325 of the air electrode contacts the other end of the fuel electrode 121. Therefore, it is preferable to extend the other end of the electrolyte 123 in the direction of the tubular support 110 so as to apply the other side of the fuel electrode 121 to prevent contact between the internal connecting member 130 and the other end of the fuel electrode 121. Further, by extending the other end 325 of the cathode in the direction of the tubular support 110 to apply the other end of the electrolyte 123 extended to enhance the reliability of the electrical connection between the internal connection member 130 and the other end 325 of the cathode. Can be.

Here, the internal connecting member 130 and the external connecting member 140 is an electrical connection means, so it should be formed of an electrically conductive material, and the internal connecting member 130 is transferred from the inside of the tubular support 110 to the fuel electrode 121. It is desirable to have gas impermeability to prevent fuel from flowing out at the edges. In addition, it is preferable to arrange a separate gas impermeable material 145 in the one corner 115 to prevent the outflow of the gas at the corner 115 is not formed.

11 to 14 are perspective views of various solid oxide fuel cells according to another exemplary embodiment of the present invention.

The difference between the present embodiment and the above-described embodiment is a position where the anode 121 and the cathode 125 are formed. That is, in the present exemplary embodiment, the first electrode is defined as the cathode 125, and the second electrode is defined as the anode 121. Therefore, the description overlapping with the above-described embodiment will be omitted and described based on the difference.

A plurality of cathodes 125 are formed in each plane except for the edge of the tubular support 110, and a plurality of electrolytes 123 are selectively formed outside the cathode 125, and selectively outside the electrolyte 123. As a result, a plurality of fuel electrodes 121 are formed. The cathode 125 receives air from the tubular support 110, and the anode 121 receives fuel from the outside of the fuel cell to generate electrical energy. At this time, the tubular support 110 is preferably formed of a porous material.

On the other hand, the external connection member 140 is selected at any one corner 115 of the tubular support 110 to electrically at one end of the cathode 125 formed on both sides with respect to the one corner 115 and the other end of the fuel electrode 121. Is connected. In this case, when the external connection member 140 connected to one end of the cathode 125 is in contact with one end of the anode 121, a short circuit occurs, so that one end of the anode 121 may be formed to be spaced apart from the external connection member 140. Do.

On the other hand, the internal connection member 130 electrically connects one end of the cathode 125 formed on both sides and the other end of the fuel electrode 121 on the basis of the corner except for the corner 115 where the external connection member 140 is formed. In this case, a short circuit occurs when the internal connecting member 130 connected to one end of the cathode 125 is in contact with one end of the anode 121. Therefore, it is preferable to form one end of the anode 121 to be spaced apart from the internal connection member 130.

In addition, a short circuit occurs when the internal connection member 130 connected to the other end of the anode 121 is in contact with the other end of the cathode 125. Therefore, it is preferable to extend the other end of the electrolyte 123 in the direction of the tubular support 110 so as to apply the other side of the cathode 125 to prevent contact between the inner connecting member 130 and the other end of the cathode 125. The other end of the anode 121 is extended in the tubular support 110 to apply the other end of the extended electrolyte 123 to enhance reliability of the electrical connection between the internal connection member 130 and the other end of the anode 121. Can be.

On the other hand, the internal connection member 130 preferably has a gas impermeability to prevent the air transferred from the inside of the tubular support 110 to the cathode 125 to flow out of the corner. In addition, it is preferable to arrange a separate gas impermeable material 145 in the one corner 115 to prevent the outflow of the gas at the corner 115 is not formed.

According to the present invention, unlike the conventional solid oxide fuel cell, a plurality of unit cells 120 are formed in one tubular support 110, and the plurality of unit cells 120 may be connected in series to generate electrical energy. Therefore, the power density per unit volume can be increased, and the amount of power loss due to electrical resistance can be reduced by maintaining a high voltage at the time of current collection. For example, if the outer circumferential surface of the tubular support 110 is composed of six planes (see FIGS. 6 and 11) and each unit cell 120 maintains an ideal voltage of 1.1 V, the solid oxide fuel according to the present invention. The battery can obtain electrical energy with a voltage of 6.6V. Therefore, under the same conditions, since the voltage 6 times higher than that of the solid oxide fuel cell manufactured by the conventional method can be obtained, the amount of power loss due to the electrical resistance can be reduced.

2 to 6 are diagrams showing a method of manufacturing a solid oxide fuel cell according to a preferred embodiment of the present invention in the order of process.

In the present embodiment, the first electrode is defined as the anode 121, and the second electrode is defined as the cathode 125, but the scope of rights is not limited thereto. The first electrode is the cathode 125, and the second electrode is defined as the cathode 125. In the case of the fuel electrode 121, since the unit cell 120 is formed in the same manner, it goes without saying that it belongs to the scope of the present invention.

2 to 6, in the method for manufacturing a solid oxide fuel cell according to the present embodiment, preparing a polygonal tubular support 110 having an outer circumferential surface consisting of a plurality of planes 111 and a plurality of planes 111. And a step of forming a plurality of unit cells 120 each and an inner connection member 130 connecting the plurality of unit cells 120 in series and an outer connection member 140 connecting the current collecting means. Configuration.

First, as shown in Figure 2, the outer peripheral surface is a step of preparing a polygonal tubular support 110 consisting of a plurality of planes (111). The corner of the tubular support 110 is provided with an inner connecting member 130 in a step to be described later, it is preferable to round the corners (rounding) 117 to prevent the occurrence of cracks of the inner connecting member (130). In addition, as described above, the tubular support 110 is preferably formed of a material having insulation to prevent a short circuit and at the same time having a porosity to deliver fuel to the anode 121.

Next, as shown in FIGS. 3 to 5, the plurality of unit cells 120 are formed on the plurality of planes 111, respectively. This step includes forming the anode 121 (see FIG. 3), forming the electrolyte 123 (see FIG. 4), and forming the cathode 125 (see FIG. 5).

First, as shown in FIG. 3, the anode 121 is formed on each plane 111 except for the edge of the tubular support 110. At this time, care should be taken not to contact the anodes 121 formed on the respective planes 111.

The fuel electrode 121 may use a material (nickel / YSZ cermet) obtained by sintering nickel oxide powder containing 40% to 60% zirconia powder. Here, nickel oxide is reduced to metallic nickel by hydrogen when generating electrical energy, thereby exhibiting electronic conductivity.

Next, as shown in FIG. 4, an electrolyte 123 is selectively formed outside the fuel electrode 121. In this case, the other end of the electrolyte 123 is directed toward the tubular support 110 in order to prevent a short circuit occurring by contacting the other end of the anode 121 with the other end of the internal electrode 130 to be connected to the other end of the cathode 125. It is preferable to apply the other side of the fuel electrode 121 to extend.

The electrolyte 123 should serve to prevent the gas (fuel or air) transferred from the inside of the tubular support 110 to the anode 121 to flow out to the outside, so that minute gaps, pores or scratches are not generated. Should be. The electrolyte 123 may use yttria stabilized zirconia (YSZ) in which yttria (Y ₂ O ₃ ) is dissolved in zirconia (ZrO ₂ ) about 3% to 10%. Here, in the YSZ, since some of the tetravalent zirconium ions are replaced by trivalent yttrium ions, one oxygen ion hole per two yttrium ions is generated inside, and oxygen ions move through the hole at high temperature.

Next, as shown in FIG. 5, the cathode 125 is selectively formed outside the electrolyte 123. At this time, the other end of the cathode 125 is extended in the direction of the tubular support 110 in order to enhance the reliability of the electrical connection between the other end of the cathode 125 and the internal connecting member 130 to be performed in the following steps, the electrolyte 123. It is preferable to apply the other end of. In addition, in order to prevent a short circuit, it is preferable to form one end of the cathode 125 to be spaced apart from the internal connection member 130 to be connected to one end of the anode 121.

Air electrode 125 is fetched lobes may be used Perovskite - Type oxides, in particular it is preferred to use a high electronic conductivity is lanthanum strontium manganite arsenide (LS _{0 .84 0 .16} Sr) MnO _3. In the cathode 125, oxygen is converted into oxygen ions by LaMnO ₃ and transferred to the anode 121.

Meanwhile, when the first electrode is defined as the cathode 125 and the second electrode is defined as the anode 121, the positions at which the anode 121 and the cathode 125 are formed may be changed.

The manufacturing method for forming the anode 121, the cathode 125, and the electrolyte 123 is largely divided into a dry method and a wet method. The dry method is a plasma spray method, an electrochemical deposition method, a sputtering method, an ion beam method, and the like. , Ion implantation, etc., and the wet method is tape cating, spray coating, dip coating, screen printing, doctor blade, etc. have. In the present invention, when forming the anode 121, the cathode 125, and the electrolyte 123, one of the above-described methods may be selected or used in combination of two or more methods in consideration of precision and economy. For example, when the electrolyte 123 is formed, the edge of the tubular support 110 is dip coated with an adhesive mask and then dip coated to remove the adhesive mask, thereby removing the edge of the anode 121 or the cathode 125 except for the edge. Only the electrolyte 123 can be selectively formed. In addition, when forming the unit cell in the order of the cathode 125, the electrolyte 123, and the anode 121, it is preferable to use the plasma spray method to precisely form the anode 121 while preventing the deformation of the cathode 125. Do.

Next, as shown in FIG. 6, an internal connection member 130 connecting the plurality of unit cells 120 in series and an external connection member 140 connected to the current collector are provided. In more detail, on the basis of the one edge 115 of the tubular support 110 is provided with an external connection member 140 for connecting one end of the anode 121 and the other end of the cathode 125 formed on both sides with the current collecting means, The inner connection member 130 may be configured to connect one end of the anode 121 and the other end of the cathode 125 formed on both sides of the edge of the outer connector 140, except for the one edge 115 formed thereon. In addition, the internal connection member 130 preferably has gas impermeability to prevent the fuel transferred from the inside of the tubular support 110 to the anode 121 to flow out from the corner, and the internal connection member 130 is not provided. In order to prevent the outflow of gas at the edges 115, it is preferable to provide a separate gas impermeable material 145 at the edges 115.

In this case, the positions of the anode 121 and the cathode 125 may be changed as described above. However, in the case where the outermost shell is the cathode 125, the inner connecting member 130 and the outer connecting member 140 are exposed to an oxidizing atmosphere, and thus, the outer connecting member 130 may be made of a material resistant to oxidation.

Although the present invention has been described in detail through specific examples, it is intended to describe the present invention in detail, and the solid oxide fuel cell and its manufacturing method according to the present invention are not limited thereto, and within the technical spirit of the present invention. It will be apparent that modifications and improvements are possible by one of ordinary skill in the art.

All simple modifications and variations of the present invention fall within the scope of the present invention, and the specific scope of protection of the present invention will be apparent from the appended claims.

1A to 1B are perspective views of a conventional solid oxide fuel cell;

2 to 6 are views showing a method of manufacturing a solid oxide fuel cell according to a preferred embodiment of the present invention in the order of process;

7 is an enlarged view illustrating main parts of a solid oxide fuel cell according to an exemplary embodiment of the present invention;

8 to 10 are perspective views of various solid oxide fuel cells according to a preferred embodiment of the present invention; And

10 to 14 are perspective views of various solid oxide fuel cells according to another exemplary embodiment of the present invention.

<Description of main parts of drawing>

100, 200, 300, 400: solid oxide fuel cell 110: tubular support

111: plane 115: corner

117: rounding 119: inner circumference

120: unit cell 121: fuel electrode

123: electrolyte 125: air electrode

130: internal connection material 140: external connection material

145: gas impermeable material 221, 321: one end of the anode

225, 325: the other end of the air electrode

Claims (19)

A polygonal tubular support having an outer circumference having a plurality of planes; A plurality of unit cells each formed on the plurality of planes; An internal connection member connecting the plurality of unit cells in series; And An external connection member connecting the plurality of unit cells connected in series with a current collector; Solid oxide fuel cell comprising a. The method according to claim 1, The plurality of unit cells, A plurality of first electrodes formed on each of the planes except for corners of the tubular support; A plurality of electrolytes selectively formed outside the first electrode; And A plurality of second electrodes selectively formed on the outside of the electrolyte; Solid oxide fuel cell comprising a. The method according to claim 2, The external connection member, Characterized in that connecting one end of the first electrode and the other end of the second electrode formed on both sides with respect to the one edge of the tubular support and the current collecting means, The internal connecting member, A solid oxide fuel cell comprising one end of the first electrode formed at both sides and the other end of the second electrode formed on both sides of the tubular support except for the one edge, and formed of gas impermeability. The method of claim 3, The electrolyte has a second end extending in the tubular support to apply the other side of the first electrode, And the second electrode extends in the direction of the tubular support to apply the other end of the electrolyte. The method of claim 3, One end of the second electrode is formed so as to be spaced apart from the internal connection member or an external connection member. The method according to claim 2, The first electrode is a fuel electrode, the second electrode is a solid oxide fuel cell, characterized in that the air electrode. The method according to claim 2, And the first electrode is an air electrode, and the second electrode is a fuel electrode. The method according to claim 1, The tubular support is a solid oxide fuel cell, characterized in that the outer peripheral surface is formed of three, four, five or six planes. The method according to claim 1, The tubular support is a solid oxide fuel cell, characterized in that the inner peripheral surface is composed of a curved surface. The method according to claim 1, The tubular support is a solid oxide fuel cell, characterized in that formed of an insulating material. The method according to claim 1, The tubular support is a solid oxide fuel cell, characterized in that formed of a porous material. The method according to claim 1, The tubular support is a solid oxide fuel cell, characterized in that formed of alumina-based ceramic material. The method according to claim 1, The edge of the tubular support is a solid oxide fuel cell, characterized in that the rounded. (A) preparing a polygonal tubular support having an outer circumferential surface consisting of a plurality of planes; (B) forming a plurality of unit cells in each of the plurality of planes; And (C) providing an internal connection member for connecting the plurality of unit cells in series and an external connection member for connecting with a current collector; Solid oxide fuel cell manufacturing method comprising a. The method according to claim 14, Step (B) is, (B1) forming a plurality of first electrodes in each of the planes except for the edges of the tubular support; (B2) selectively forming a plurality of electrolytes outside the first electrode; And (B3) optionally forming a plurality of second electrodes outside of the electrolyte; Solid oxide fuel cell manufacturing method comprising a. 16. The method of claim 15, Step (C) is Providing an external connection member connecting one end of the first electrode and the other end of the second electrode formed on both sides of the tubular support with the current collecting means; And And an internal connection member connecting one end of the first electrode and the other end of the second electrode formed on both sides with respect to the edge of the tubular support except for the one edge of the solid oxide fuel cell. Manufacturing method. The method according to claim 14, In the step (B), The plurality of unit cells include a tape casting method, a spray coating method, a dip coating method, a screen printing method, a doctor blade method, an electrochemical deposition method, A method of manufacturing a solid oxide fuel cell, characterized in that it is formed by sputtering, ion beam, ion implantation or plasma spray. 16. The method of claim 15, The first electrode is a fuel electrode, and the second electrode is a method of manufacturing a solid oxide fuel cell, characterized in that the air electrode. 16. The method of claim 15, And the first electrode is an air electrode, and the second electrode is a fuel electrode.

Images