KR101769830B1 - Solid oxide fuel-cell stacking structure - Google Patents

Abstract

The solid oxide fuel cell stack includes a plurality of flat tubular single cells and a connecting member. Each of the plurality of flat tubular single cells includes a support portion, a first battery portion, and a second battery portion. The support portion has a flow path. The first battery unit includes a first fuel electrode disposed under the support portion, a first electrolyte disposed under the first fuel electrode, and a first air electrode disposed under the first electrolyte. The second battery unit includes a second fuel electrode disposed on the upper portion of the support and spaced apart from the first fuel electrode, a second electrolyte disposed on the second fuel electrode, and a second air electrode disposed on the second electrolyte and spaced apart from the first air electrode . The connecting member electrically connects the first battery units of the flat tubular unit cells to the second battery units. According to such a solid oxide fuel cell stack, it is possible to generate a high current or a high voltage.

Description

[0001] SOLID OXIDE FUEL-CELL STACKING STRUCTURE [0002]

The present invention relates to a solid oxide fuel cell stack, and more particularly, to a solid oxide fuel cell stack capable of producing a high current density or a high voltage.

Generally, a fuel cell is referred to as a first-generation battery (a battery), a second-generation battery (rechargeable battery) followed by a third-generation battery, and is a battery that directly converts chemical energy generated by oxidation of fuel into electrical energy.

A feature of such a fuel cell is that it can produce electricity semi-permanently during the continuous supply of reactants from the outside and the reaction products are continuously removed from the system, and energy efficiency is very high because there is no loss in mechanical conversion . The fuel cell uses various fuels such as fossil fuel, liquid fuel, and gaseous fuel, and is divided into a low temperature type and a high temperature type according to the operating temperature.

Among them, Solid Oxide Fuel Cell (hereinafter referred to as SOFC) is a fuel cell using an ion conductive solid oxide as an electrolyte, and operates at the highest temperature (600 to 1000 ° C.) among the existing fuel cells, Because all the components are solid, they are simpler in structure than other fuel cells, there is no problem of electrolyte loss and replenishment and corrosion, and there is no need for precious metal catalyst and it is easy to supply fuel through direct internal reforming.

In addition, it has an advantage that it can generate thermal hybrid power using waste heat because it discharges gas at a high temperature. Because of these advantages, research on SOFC has been actively carried out in advanced countries such as the United States and Japan with the aim of commercialization in the early 21st century.

The SOFC may be classified into a plate type, a tubular type, or a flat tubular type in which the SOFCs are mixed according to the laminated structure. In recent years, various studies have been made to produce a high current or a high voltage by stacking a flat tubular SOFC.

It is an object of the present invention to provide a solid oxide fuel cell stack structure capable of generating a high density current or a high voltage.

According to an aspect of the present invention, there is provided a solid oxide fuel cell stack including a plurality of flat tubular unit cells and a connecting member. Each of the plurality of flat tubular single cells includes a support portion, a first battery portion, and a second battery portion. The support portion has a flow path. The first battery unit includes a first fuel electrode disposed under the support portion, a first electrolyte disposed under the first fuel electrode, and a first air electrode disposed under the first electrolyte. The second battery unit includes a second fuel electrode disposed on the upper portion of the support portion and spaced apart from the first fuel electrode, a second electrolyte disposed on the second fuel electrode, and a second electrolyte disposed on the second electrolyte and spaced apart from the first air electrode, And an air electrode. The connecting member electrically connects the first battery units of the plurality of flat tubular unit cells to the second battery units. Each of the plurality of flat tubular single cells may further include a first current collector and a second current collector. The first current collector is in contact with the first fuel electrode exposed through the opening of the first electrolyte and is disposed apart from the first air electrode. The second current collector is in contact with the second fuel electrode exposed through the opening of the second electrolyte and is disposed apart from the second air electrode.

In one embodiment of the present invention, the plurality of flat tubular unit cells include first and second flat tubular unit cells stacked successively, and the connecting member includes a first anode electrode contact portion, a first cathode electrode contact portion, 1 < / RTI > The first anode electrode contact portion is electrically connected to the first current collector of the first flat tubular unit cell. The first air electrode contact portion is disposed between the second air electrode of the first flat tubular unit cell and the first air electrode of the second flat tubular unit cell, and the second air electrode of the first flat tubular unit cell and the second air electrode of the second flat tubular unit cell 1 air electrode. The first connecting portion is disposed on the first side of the first flat tubular unit cell and electrically connects the first anode electrode contact portion and the first cathode electrode contact portion.

The connecting member may further include a second connecting member including a second anode electrode contact portion, a second cathode electrode contacting portion, and a second connecting portion. The second anode electrode contact portion is disposed between the second current collector of the first flat tubular unit cell and the first current collector of the second flat tubular unit cell, and the second current collector of the first flat tubular unit cell and the second flat tubular unit And is electrically connected to the first current collector of the battery. And the second air electrode contact portion is electrically connected to the second air electrode of the second flat tubular unit cell. The second connection portion is disposed on the side of the second flat tubular unit cell facing the first side of the first flat tubular unit cell and electrically connects the second anode electrode contact portion and the second air electrode contact portion.

A plurality of protrusions or recesses may be formed in the first air electrode contacting portion which is in contact with the second air electrode of the first flat tubular unit cell and the first air electrode of the second flat tubular unit cell, A plurality of protrusions or recesses may also be formed in the second air electrode contact portion that contacts the second air electrode of the second air electrode.

In one embodiment of the present invention, the plurality of flat tubular unit cells include first and second flat tubular unit cells stacked successively, and the connecting member may include a first connecting member, a second connecting member, and a third connecting member. The first connector includes a first anode electrode contact portion, a first cathode electrode contact portion, and a first connection portion. The first anode electrode contact portion is electrically connected to the first current collector of the first tubular type single cell. The first air electrode contact portion is disposed between the second air electrode of the first flat tubular unit cell and the first air electrode of the second flat tubular unit cell and is in contact with the second air electrode of the first flat tubular unit cell. The first connecting member is disposed on the first side of the first flat tubular unit cell, and electrically connects the first anode electrode contact portion and the first cathode electrode contact portion. The second connector includes a second anode electrode contact portion, a second cathode electrode contact portion, and a second connector. The second anode electrode contacting portion is disposed between the second current collector of the first flat tubular single cell and the first current collector of the second tubular single cell, and contacts the first current collector of the second tubular single cell. And the second air electrode contact portion is electrically connected to the second air electrode of the second flat tubular unit cell. The second connecting member is disposed on the first side of the second flat tubular unit cell adjacent to the first side of the first flat tubular unit cell and electrically connects the second anode electrode contact portion and the second air electrode contact portion. The third connecting member is disposed between the first flat tubular unit cell and the second flat tubular unit cell, and electrically connects the second current collector of the first flat tubular unit cell and the first air electrode of the second tubular unit cell. The third linking member may include a base portion and a stepped portion. Wherein the base portion is disposed between the second current collector and the second anode electrode contact portion of the first flat tubular single cell and is in contact with the second current collector of the first flat tubular single cell, And is disposed apart from the second air electrode. The stepped portion is disposed between the second air electrode of the first flat tubular unit cell and the first air electrode of the second flat tubular unit cell and is in contact with the first air electrode of the second tubular unit cell, 1 air electrode and the second fuel electrode contact portion.

In one embodiment of the present invention, the linking member may include a first linking member and a second linking member. The first connector may include a first anode electrode contact portion, a second anode electrode contact portion, and a first connection portion. The first anode electrode contacting portion is in contact with the first current collector of the first flat tubular single cell among the plurality of flat tubular single cells. And the second anode electrode contacting portion is in contact with the second current collector of the first flat tubular single cell. The first connecting member is disposed on the first side of the first flat tubular unit cell, and electrically connects the first and second anode electrode contacts. The second connector includes a first air electrode contact portion, a second air electrode contact portion, and a second connector. The first air electrode contact portion is in contact with the first air electrode of the first flat tubular unit cell. And the second air electrode contact portion is in contact with the second air electrode of the first flat tubular single cell. The second connector is disposed on the second side of the first tubular unit cell facing the first side, and electrically connects the first and second air electrode contacts.

The first connecting member may further include a third anode electrode contact portion which is in contact with the second current collector of the second flat tubular single cell among the plurality of flat tubular single cells adjacent to the first flat tubular single cell and is electrically connected to the first connecting portion have. The second connection member may further include a third cathode electrode contact portion that is in contact with the second air electrode of the second flat tubular unit cell and is electrically connected to the second connection portion. The second anode electrode contact portion is in contact with the first collector of the first flat tubular unit cell and the first current collector of the second tubular unit cell and the second air electrode contact portion is in contact with the second air electrode of the first tubular unit cell, And can contact the first air electrode of the flat tubular single cell.

In an embodiment of the present invention, the coupling member may include a plurality of coupling plates, a first coupling portion, and a second coupling portion. Each of the plurality of connecting plates may include an insulating plate, a cathode electrode contact portion formed on the insulating plate, and an anode electrode contact portion formed on the insulating plate so as to be spaced apart from the cathode electrode contacting portion, and the adjacent flat tubular single cells As shown in FIG. The first connection portion may electrically connect the air electrode contact portions of the plurality of connection plates. And the second connection portion may electrically connect the anode electrode contacts of the plurality of connection plates.

The cathode electrode contact portion may be in contact with the second air electrode of the first flat tubular unit cell and the first air electrode of the second flat tubular unit cell adjacent to the first flat tubular unit cell among the plurality of flat tubular single cells. The anode electrode contact portion may contact the first collector of the first flat tubular unit cell and the first collector of the second tubular unit cell. The first and second connection portions may respectively contact the cathode electrode contact portion and the anode electrode contact portion formed on the opposite sides of the insulating plate.

According to such a solid oxide fuel cell stack, the first cell units and the second cell units formed in the flat tubular unit cells can be connected in various ways, and a high-density current or a high voltage can be generated.

1 is a perspective view illustrating a solid oxide fuel cell according to Embodiment 1 of the present invention.
Fig. 2 is a perspective view showing the connector shown in Fig. 1. Fig.
3A is a plan view showing the surface configuration of the air electrode contact portion.
Figs. 3B and 3C are cross-sectional views taken along the line A-A 'shown in Fig. 3A.
FIG. 4A is a perspective view showing a stacked solid oxide fuel cell stacked structure using the connecting materials shown in FIGS. 1 and 2. FIG.
4B is a perspective view of the first connector shown in FIG. 4A.
4C is a perspective view of the second connector shown in FIG. 4A.
4D is a perspective view of the third connector shown in FIG. 4A.
4E is a perspective view of the fourth connector shown in FIG. 4A.
5 is an equivalent circuit diagram of the solid oxide fuel cell stack shown in FIG. 4A.
6A is a perspective view of a solid oxide fuel cell stack according to Embodiment 2 of the present invention.
6B is a perspective view of the seventh and eighth connecting members shown in Fig. 6A.
7 is an equivalent circuit diagram of the solid oxide fuel cell stack shown in FIG.
8A is a perspective view showing a solid oxide fuel cell stack according to Embodiment 3 of the present invention.
FIG. 8B is a perspective view showing the first connector shown in FIG. 8A. FIG.
8C is a perspective view showing the second connector shown in FIG. 8A.
FIG. 8D is a perspective view of the third connector shown in FIG. 8A. FIG.
8E is a perspective view of the fourth connector shown in FIG. 8A.
FIG. 9 is an equivalent circuit diagram of the solid oxide fuel cell stack shown in FIG. 8A. FIG.
10 is a perspective view showing a solid oxide fuel cell stack according to Embodiment 4 of the present invention.
11A is a perspective view of the first and second link members shown in Fig.
And Fig. 11B is a perspective view of the third connector shown in Fig.
12 is an equivalent circuit diagram of the solid oxide fuel cell stack shown in FIG.
13 is a perspective view showing a solid oxide fuel cell according to Embodiment 5 of the present invention.
14 is a perspective view of the first connector shown in Fig.
15 is a perspective view of the second connector shown in Fig.
FIG. 16 is an exploded perspective view showing a solid oxide fuel cell stacked structure in which flat electrodes are stacked using the connecting material shown in FIGS. 13 to 15. FIG.
17 is an equivalent circuit diagram of the solid oxide fuel cell stack shown in FIG.
18 is a perspective view showing a solid oxide fuel cell stack according to Embodiment 6 of the present invention.
19 is a perspective view showing the connection plate shown in Fig.
20 is a perspective view of the first connection portion shown in FIG.
21 is a perspective view of the second connection portion shown in Fig.

Hereinafter, a SOFC according to an embodiment of the present invention and a method of manufacturing the same will be described in detail with reference to the accompanying drawings. The present invention is capable of various modifications and various forms, and specific embodiments are illustrated in the drawings and described in detail in the text. It should be understood, however, that the invention is not intended to be limited to the particular forms disclosed, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention. Like reference numerals are used for like elements in describing each drawing. In the accompanying drawings, the dimensions of the structures are enlarged to illustrate the present invention in order to clarify the present invention.

The terms first, second, etc. may be used to describe various components, but the components should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the first component may be referred to as a second component, and similarly, the second component may also be referred to as a first component.

The terminology used in this application is used only to describe a specific embodiment and is not intended to limit the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise. In this application, the terms "comprises", "having", and the like are used to specify that a feature, a number, a step, an operation, an element, a part or a combination thereof is described in the specification, But do not preclude the presence or addition of one or more other features, integers, steps, operations, components, parts, or combinations thereof.

On the other hand, unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Terms such as those defined in commonly used dictionaries are to be interpreted as having a meaning consistent with the contextual meaning of the related art and are to be interpreted as either ideal or overly formal in the sense of the present application Do not.

Example  One

FIG. 1 is a perspective view illustrating a solid oxide fuel cell according to a first embodiment of the present invention, and FIG. 2 is a perspective view illustrating the connector shown in FIG.

Referring to FIGS. 1 and 2, the solid oxide fuel cell according to the first embodiment includes a flat tubular unit cell 200 and a connecting member 100.

The flat tubular unit cell 200 includes a support 210, a first battery 230, a second battery 250, a first current collector 270, and a second current collector 290. In the present application, the term " flat tubular " is merely for classifying a solid oxide fuel cell, not for limiting the shape of a solid oxide fuel cell. Further, in the present application, the term " unit cell " is used to denote a fuel cell or a collection of fuel cells that are supplied with fuel through a flow path formed in one support portion. That is, the term "unit cell" used in the present application includes not only the case where the first battery section and the second battery section formed on both sides of the single support section function as one battery, but also the case where the first and second battery sections function as separate and independent batteries.

The support portion 210 has at least one flow passage 211 through which the fuel gas can move. The fuel gas containing hydrogen (H ₂ ) is supplied to the first and second electrode portions 230 and 250 formed on both sides of the support portion 210 through the flow path 211.

In one embodiment of the present invention, the support comprises a plurality of supports 210a, 210b extending in a first direction X and spaced apart from one another in a second direction Y substantially perpendicular to the first direction X, 210b. Each of the supports 210a and 210b has a length in a first direction X, a width in a second direction Y, and a width in a third direction Z perpendicular to the first and second directions X and Y As shown in FIG. The lengths and heights of the supports 210a and 210b are preferably equal to each other. For example, each of the supports 210a and 210b may have a rectangular parallelepiped shape elongated in the first direction X. [ Alternatively, the outer surface of the supports 210a disposed at the outermost one of the supports 210a and 210b may be curved. It is preferable that the upper surfaces and the lower surfaces of the supporters 210a and 210b are positioned on the same plane so as to support the first and second power supply units 230 and 250 formed on the upper and lower portions of the supporter 210. [ The first ends of the supports 210a and 210b defining the first side of the support 210 are positioned in the same plane and are spaced apart from each other by supports 212 that define a second side of the support 210 opposite the first side 210a, 210b are also located on the same plane.

The supports 210a and 210b may include two first supports 210a disposed at the outermost portion and a plurality of second supports 210b disposed between the first supports 210a. The third and fourth sides of the support 210 connecting the first and second sides of the support 210 facing each other by the sides of the first supports 210a opposed to the second supports 210b, Are defined. The third and fourth sides may be planar or curved surfaces projecting outwardly. The second supports 210b are spaced apart from each other between the first supports 210a and the space between the first and second supports 210a and 210b is connected to the flow passage 211 through which the fuel gas moves Function. That is, the inlet and the outlet of the flow passage 211 can be opened to the outside through the first and second sides of the support portion 210, respectively. For structural stability and sealing of the fuel gas, the width of the first supports 21a may be greater than the width of the second supports 210b. Alternatively, the widths of the first supports 210a and the second supports 210b may be equal to each other.

The support 210 includes a lower support plate 210c that contacts the lower surfaces of the supports 210a and 210b and an upper support plate 210c that contacts the upper surfaces of the supports 210a and 210b. 210d. The upper support plate 210d and the lower support plate 210c are disposed to cover the upper and lower portions of the flow path 211, respectively, and are preferably made of a porous material. The upper support plate 210d and the lower support plate 210c function to reinforce the strength of the support portion 210. [ The upper support plate 210d and the lower support plate 210c may be integrally formed with the supports 210a and 210b or may be formed as functional layers different from the supports 210a and 210b.

The support portion 210 may be formed using ceramic, metal, or a mixed material thereof. For example, the support 210 may be made of alumina (Al ₂ O ₃ ), YSZ (Yttria Stabilized Zirconia), a mixture of YSZ and nickel (Ni), or the like. The supports 210a and 210b of the support 210 are preferably formed in a dense structure having no pores for sealing the fuel gas. In order to supply the fuel gas to the first and second charge portions 230 and 250 when the support portion 210 further includes the lower and upper support plates 210c and 210d, the lower and upper support plates 210c and 210d Is preferably formed of a porous material.

The first battery 230 is formed at the lower portion of the support 210. The first electrode 230 includes a first anode 231, a first electrolyte 233, and a first cathode 235.

The first fuel electrode 231 is disposed at a lower portion of the support portion 210 and receives the fuel gas directly through the flow path 211 formed in the support portion 210 or receives the fuel gas via the lower support play 210c frame . The first fuel electrode 231 preferably has a porous structure including pores so that hydrogen contained in the fuel gas can move. Specifically, the first fuel electrode 231 may be made of a mixture of nickel (Ni) and YSZ, which is an ion conductive ceramic material.

The first electrolyte 233 is disposed under the first fuel electrode 231. The first electrolyte 233 is preferably formed of a material having high ion conductivity, low electrical conductivity, stability in an oxidation-reduction atmosphere, and excellent mechanical properties. For example, the first electrolyte 233 is YSZ, (La, Sr) (Ga, Mg) O _3, Ba (Zr, Y) O _3, GDC (Gd doped CeO _2), YDC (Y ₂ O ₃ doped CeO2). ≪ / _RTI > For example, the first electrolyte 233 may be composed of 8 mol-YSZ.

The first air electrode 235 is disposed under the first electrolyte 233 and contacts the air containing oxygen (O ₂ ) flowing from the outside. The first air electrode 235 preferably has a porous structure so that oxygen can pass therethrough. The first air electrode 235 may be made of a mixture of lanthanum (La), strontium (Sr), and manganese (Mn), such as LSM or lanthanum La, strontium Sr, cobalt Cobalt (Co) and Iron (Fe).

In an embodiment of the present invention, the area of the first electrolyte 233 may be larger than the area of the first fuel electrode 231 and the area of the first air electrode 235. The area of the first fuel electrode 231 may be larger than the area of the first air electrode 235. For example, the first fuel electrode 231 may be completely covered with the first electrolyte 233, and the first air electrode 235 may be formed so as to cover only a part of the first electrolyte 233. [ Specifically, the first electrolyte 233 may be formed so as to completely cover the lower surfaces of the supports 210a and 210b, and the first air electrode 235 may be formed so as to cover the upper surface of the support portion 210 formed with the inlet and the outlet of the flow path 211 And may be formed only in the central region between the first and second sides. A portion of the first electrolyte 233 located between the first side of the support 210 and the first air electrode 235 and a portion of the first side of the support 231 located between the second side of the support 210 and the first air electrode 235 A portion of the first electrolyte 233 may not be covered by the first air electrode 235. [ A portion of the first electrolyte 233 positioned between the first side of the support 210 and the first air electrode 235 and a portion of the first side of the first air electrode 235 located between the second side of the support 210 and the first air electrode 235, In some regions of the electrolyte 233, openings may be formed in which a first current collector 273 to be described later is to be formed.

The second battery unit 250 is formed on the upper portion of the support unit 210. The second electrode unit 250 includes a second fuel electrode 251 disposed on the support 210, a second electrolyte 253 disposed on the second fuel electrode 251, and a second electrolyte 253 disposed on the second electrolyte 253. And a second air electrode 255.

The second fuel electrode 251 may be spaced apart from the first fuel electrode 231 and the second air electrode 255 may be spaced apart from the first air electrode 235. That is, the first and second battery units 230 and 250 may function as independent batteries. The first and second battery units 230 and 250 have a symmetrical structure with respect to each other with respect to the support unit 210. The components of the second battery unit 250 are connected to the first and second battery units 230 and 230, Substantially the same as the component. Therefore, the description of the second battery unit 250 will be replaced with a description of the first battery unit 230.

The first and second electrolytes 233 and 253 having ion conductivity transmit the oxygen ions supplied to the first and second air electrodes 235 and 255 to the first and second fuel electrodes 231 and 251, Oxygen ions passing through the first and second electrolytes 233 and 253 are respectively combined with hydrogen (H ₂ ) existing in the first and second fuel electrodes 231 and 251 to generate water (H ₂ O) and electrons do. The first and second power supply units 230 and 250 generate a voltage / current by the above reaction.

The first current collector 270 is formed inside the opening of the first electrolyte 233 exposing the first fuel electrode 231. The first current collector 270 is a member for collecting electrons generated from the first fuel electrode 231 to the outside and is electrically connected to the first fuel electrode 231. For example, the first current collector 270 may be formed of a conductive ceramic, a metal, a cermet, or the like.

The first current collector 270 electrically connected to the first fuel electrode 231 should not be electrically connected to the first air electrode 235 so that the first current collector is spaced apart from the first air electrode 235. The first current collector 270 may be formed of a single member, but may be formed of two members spaced apart from each other with a first air electrode 235 interposed therebetween in order to reduce the traveling distance of electrons. For example, when the first air electrode 235 is formed only on the upper portion of the central region of the first electrolyte 233 located between the first and second sides of the support portion 210, the opening of the first electrolyte 233 is supported by the support portion 210 and the first air electrode 235 and between the second side of the support 210 and the first air electrode 235 and the opening of the first electrolyte 233 The first current collector 271 and the second current collector 273 of the first current collector 270 that are in contact with the first fuel electrode 231 can be formed by filling the conductive paste. The planar shape of the first and second current collectors 271 and 273 can be variously changed as needed. For example, the first and second current collectors 271 and 273 may each have a rectangular planar shape extending in the second direction Y. In this case, the length of the long side of the rectangle may be a length May be equal to or smaller than the width in the second direction (Y) of the protrusion (231).

The upper surface of the first current collector 270 preferably exists in the same plane as the upper surface of the first air electrode 235. That is, it is preferable that the first current collector 270 and the first air electrode 235 are formed at the same height with respect to the surface of the first electrolyte 233. Alternatively, the height of the first current collector 270 may be lower or higher than the height of the first air electrode 235.

The second current collector 290 is formed inside the opening of the second electrolyte 253 that exposes the second fuel electrode 251. The second current collector 290 has a symmetrical structure with respect to the first current collector 270 with respect to the supporting portion 210. A detailed description of the second current collector 290 will be omitted in the first current collector 270 Instead,

The connection member 100 electrically connects the first and second battery units 230 and 250. To this end, the connector 100 is formed of a conductive material. For example, the coupling member 100 may be made of a conductive ceramic or a metal. The metal that can be used for the connection member 100 may include platinum (Pt), silver (Ag), nickel (Ni), stainless steel, crofer, and the like.

The connecting member 100 includes a fuel electrode contacting portion 101, a cathode contacting portion 103 and a connecting portion 105. The anode electrode contact portion 101 is in contact with the first current collector 270 and the cathode electrode contact portion 103 is in contact with the second air electrode 255 of the second electrode portion 250. The connection portion 105 is in contact with the support portion 210, And electrically connects the anode electrode contact portion 101 and the cathode electrode contact portion 103 with each other. Specifically, the fuel electrode contacting portion 101 and the air electrode contacting portion 103 are formed to extend from the connecting portion 105 along the second direction Y and are spaced apart from each other. The fuel electrode contacting portion 101 and the air electrode contacting portion 103 The flat tubular unit cell 200 is inserted.

The anode contact portion 101 may be formed of a single member like the first current collector 270 or may be formed of two members spaced apart from each other. The first current collector 270 may be disposed between the second side of the first current collector 271 and the support 210 disposed between the first side of the support 210 and the first air electrode 235, The fuel electrode contacting portion 101 includes a first member 101a and a second current collecting portion 273 contacting the first current collecting portion 271 and a second current collecting portion 273 disposed between the first current collecting portion 271 and the second current collecting portion 273. [ And may include a second member 101b that is in contact therewith. When the upper surfaces of the first and second current collectors 271 and 273 have a rectangular shape having a width in the first direction X and a length in the second direction Y, 101a, and 101b may have a plate shape that covers upper surfaces of the first and second current collectors 271 and 273, respectively. Specifically, the first and second members 101a, 101b may have a rectangular plate shape having a width in the first direction X and a length in the second direction Y, The width of the two members 101a and 101b is preferably equal to or larger than the width of the first and second current collectors 271 and 273 and the lengths of the first and second members 101a and 101b are preferably equal to or greater than the widths of the first and second members 101a and 101b, It is preferable that the length of the second current collectors 271 and 273 is larger than the length of the second current collectors 271 and 273. The first and second members 101a and 101b should have a width that does not contact the first air electrode 235 and should have a length not protruding beyond the fourth side surface of the support member 210 desirable. Alternatively, the width and length of the first and second members 101a and 101b may be smaller than the width and length of the first and second current collectors 271 and 273.

The air electrode contact portion 103 preferably has a shape corresponding to the second air electrode 255. For example, when the second air electrode 255 has a rectangular shape having a width in the first direction X and a length in the second direction Y, the air electrode contacting portion 103 is in contact with the second air electrode 255, The second air electrode 255 may have a rectangular plate shape having a width equal to or larger than the width of the second air electrode 255 and a length equal to or smaller than the length of the second air electrode 255. Alternatively, the width of the air electrode contact portion 103 may be smaller than the width of the second air electrode 255.

The anode electrode contact portion 101, the cathode electrode contact portion 103, and the connection portion 105 of the connection member 100 may be integrally formed. Alternatively, the anode electrode contact portion 101, the cathode electrode contact portion 103, and the connection portion 105 of the connection member 100 may be electrically connected to each other by a separate member in a state in which they are separated from each other. The first fuel electrode 231 of the first battery 230 is electrically connected to the second air electrode 255 of the second battery 250 by the coupling member 100. That is, the first battery 230 and the second battery 250 are connected in series by the coupling member 100.

3A is a plan view showing the surface configuration of the air electrode contact portion, and Figs. 3B and 3C are cross-sectional views taken along the line A-A 'shown in Fig. 3A.

Referring to FIGS. 1, 2, 3A, and 3C, a plurality of protrusions 10 and / or protrusions 10 are formed on an air electrode contact portion 103 of a connection member 100 that contacts the first air electrode 231 or the second air electrode 255, Or the recess 20 is formed. When the connection member 100 is in intimate contact with the second air electrode 255, the connection member 100 may prevent oxygen from being supplied to the second air electrode 255. When the protrusion 10 and / or the recess 20 are formed in the air electrode contacting portion 103 of the connecting member 100 in contact with the second air electrode 255, the second air electrode 255 and the air electrode contacting portion 103, The second air electrode 255 can be effectively supplied with oxygen.

When the air electrode contact portion 103 of the connector 100 is disposed between and contacted with the first and second air electrodes of the adjacent flat tubular unit cells, the protrusion 10 and / And may be formed on both sides of the contact portion 103.

3a, 3b and 3c, hemispherical protrusions 10 and recesses 20 are shown, but not limited thereto, the protrusions 10 and recesses 20 may be polygonal, polygonal, Pillars, cones, or a combination thereof. 3 (a), 3 (b) and 3 (c), dot-shaped protrusions 10 and recesses 20 are shown, but not limited thereto, the protrusions 10 and recesses 20 may be elongated straight lines Or a curved line. That is, the protrusions 10 and the recesses 20 can be modified into various shapes as long as they can form a flow path through which air can move between the air electrode contacting portions of the connecting member 100 and the air electrode.

3B, the protrusion 10 and the recess 20 may be formed so as to be connected to each other. However, as shown in FIG. 3C, when the protrusion 10 and the recess 20 are formed to be spaced apart from each other . Further, although not shown, only one of the projection 10 and the recess 20 may be formed in the air electrode contact portion.

FIG. 4A is a perspective view showing a stacked solid oxide fuel cell stacked structure using the connecting material shown in FIGS. 1 and 2. FIG. 4B is a perspective view of the first connecting material shown in FIG. 4A, 4D is a perspective view of the third linking member shown in FIG. 4A, and FIG. 4E is a perspective view of the fourth linking member shown in FIG. 4A. 5 is an equivalent circuit diagram of the solid oxide fuel cell stack shown in FIG. 4A.

Referring to FIGS. 1, 4A, 4B, 4C, 4D, and 4E, the solid oxide fuel cell stack according to the first embodiment of the present invention includes a plurality of flat tubular unit cells 200, And a connecting member 100.

Each of the plurality of flat tubular unit cells 200 excluding the flat tubular unit cells 300 and 400 disposed at the outermost portion has the same configuration as the flat tubular unit cell described with reference to FIG. That is, each of the plurality of flat tubular unit cells 200 except for the flat tubular unit cells 300 and 400 disposed at the outermost portion is formed at the upper and lower portions of the support unit 210 and the support unit 210, And a first current collector (not shown) and a second current collector (not shown). A plurality of flat tubular unit cells (200) are stacked along the third direction (Z). Each of the flat tubular unit cells 200 is arranged so as to be arranged from the bottom in the order of the first battery unit 230, the support unit 210, and the second battery unit 250.

The connection member 100 includes a first connection member 110 and a second connection member 120 and is connected to the first cell units 230 and the second cell units 220 of the plurality of flat tubular cells 200, 250 are electrically connected. The first connecting member 110 and the second connecting member 120 are symmetrical with respect to each other and one of the first connecting member 110 and the second connecting member 120 is the same as the connecting member described with reference to FIGS. .

Specifically, in the first through fourth flat tubular unit cells 200, which are continuously stacked, of the plurality of flat tubular unit cells 200 excluding the flat tubular unit cells 300 and 400 disposed at the outermost portions, The first connection member 110 includes a first anode electrode contact portion 111 which contacts the second current collector 290 of the first flat tubular unit cell 200 and the first current collector 270 of the second flat tubular unit cell, A first air electrode contact portion 113 contacting the second air electrode 255 of the second flat tubular unit cell and the first air electrode 231 of the third flat tubular unit cell and a support portion 210 of the second tubular unit cell, And a first connection part 115 which is disposed on the third side of the first fuel electrode contact part 111 and connects the first fuel electrode contact part 111 and the first air electrode contact part 113. The second connecting member 120 includes a second anode electrode contacting portion 121 contacting the second current collector 290 of the second flat tubular unit cell and the first current collector 270 of the third flat tubular unit cell, A second air electrode contacting portion 123 contacting the second air electrode 255 of the tubular unit cell and the first air electrode 235 of the fourth flat tubular unit cell and a third side And a second connection portion 125 disposed on a fourth side of the support portion 210 of the third flat tubular unit cell facing the first anode contact portion 121 and the second anode contact portion 123 and connecting the second anode contact portion 121 and the second air electrode contact portion 123. As shown in FIG. 4A, the first and second connectors 110 and 120 may be arranged alternately.

The second air electrode may not be formed in the flat tubular unit cell 300 disposed at the top of the flat tubular unit cells 300 and 400 disposed at the outermost portion. That is, the flat tubular unit battery 300 disposed at the uppermost portion includes only the first battery unit, and may not include the second battery unit. In this case, the coupling member 100 may further include a third coupling member 130 for coupling the first fuel electrode of the uppermost flat tubular unit cell 300 to the outside. The third connecting member 130 may have a configuration similar to that of the first connecting member 110. Specifically, the third connecting member 130 is disposed between the first collector of the uppermost flat tubular unit cell 300 and the second current collector of the flat tubular unit cell 200 adjacent to the uppermost tubular unit cell 300 The third anode electrode contact portion 131 is disposed on the third side of the uppermost tubular single cell 300 and the first external contact portion 133 and the uppermost tubular single cell 300 support portion which are disposed on the upper side and connected to the outside And a third connection part 135 for electrically connecting the third anode contact part 131 and the first external contact part 133. [ The third fuel electrode contact portion 131, the first external contact portion 133 and the third connection portion 135 of the third connection member 130 are electrically connected to the first fuel electrode contact portion 111 of the first connection member 110, 113 and the first connection part 115 of the first embodiment. The first external contact portion 133 of the third connection member 130 may have a different configuration from the first air electrode contact portion 113 of the first connection member 110. [ For example, the width of the first external contact portion 133 may be larger or smaller than the width of the first air electrode contact portion 113, and the length of the first external contact portion 133 may be longer than the length of the first air electrode contact portion 113 May be larger or smaller. The third connection member 130 may have a configuration similar to that of the second connection member 120 according to the number of flat tubular unit cells stacked.

The first air electrode may not be formed in the flat tubular unit cell 400 disposed at the lowermost one of the flat tubular unit cells 300 and 400 arranged at the outermost portion. That is, the flat tubular unit battery 400 disposed at the lowermost part has only the second battery unit, and may not include the first battery unit. In this case, the coupling member 100 may further include a fourth coupling member 140 for coupling the second air electrode of the lowermost flat tubular unit cell 400 to the outside. The fourth connector 140 is disposed between the second air electrode of the lowermost flat tubular unit cell 400 and the fourth air electrode contact portion (not shown) disposed between the first air electrode of the flat tubular unit cell 200 adjacent to the lowermost tubular unit cell 400 A second external contact portion 143 disposed on the lower portion of the lowermost flat tubular unit cell 400 and connected to the outside, and a third external contact portion 143 disposed on the third or fourth side of the lowermost tubular unit cell 400, And a fourth connection part 145 for electrically connecting the air electrode contact part 141 and the second external contact part 143. The fourth air electrode contacting portion 141 and the fourth connecting portion 145 of the fourth connecting member 140 are identical to the air electrode contacting portions 113 and 123 and the connecting portions 115 and 125 of the first or second connecting members 110 and 120 Lt; / RTI > The second external contact portion 145 may be formed of a plurality of members similar to the anode electrode contacting portions 111 and 121 of the first and second connecting members 110 and 120 but may be formed as a single member as shown in FIG. . 4E shows a second external contact portion 145 in the form of a rectangular plate, but the present invention is not limited thereto, and the shape of the second external contact portion 145 may be variously changed as needed. Also, the second external contact 145 may be formed so as to protrude outwardly across the lowermost flat tubular unit cell 400.

Alternatively, both the top flat tubular unit cell 300 and the lowermost flat tubular unit cell 400 may be formed with both the first and second battery units. In this case, the connecting member 100 has a separate fifth connecting member (not shown) for connecting the second fuel electrode of the uppermost flat tubular unit cell 300 to the outside in addition to the first and second connecting members 110 and 120, And a sixth connector (not shown) for connecting the first air electrode of the tubular unit cell 400 to the outside. 10 and 11B, which will be described later, may be used as the fifth connecting member, and a connecting member such as a rectangular plate-like connecting member, which is in contact with the first air electrode of the lowermost flat type single cell 400, Can be used.

Referring to FIG. 5, when the plurality of flat tubular unit cells 200, 300, and 400 are electrically connected to each other using the connecting material 100 as shown in FIG. 4A, the first and second battery units And are connected to each other like the circuit diagram shown in Fig. In FIG. 5, the voltage and the internal resistance generated by the first and second battery units are respectively represented by 'V' and 'r', and each of the first and second battery units generates the same voltage, Resistance.

Example  2

FIG. 6A is a perspective view of a solid oxide fuel cell stack according to Embodiment 2 of the present invention, FIG. 6B is a perspective view of the seventh and eighth connecting members shown in FIG. 6A, and FIG. Is an equivalent circuit diagram of a battery stack structure.

6A and 6B, the solid oxide fuel cell stack according to the second embodiment of the present invention includes a plurality of flat tubular cells 200, 300, 400, 500, 600, 700 stacked in two rows, And a connection member 100 for electrically connecting.

The connection member 100 is formed of a conductive material. For example, the coupling member 100 may be made of a conductive ceramic or a metal. The metal that can be used for the connection member 100 may include platinum (Pt), silver (Ag), nickel (Ni), stainless steel, crofer, and the like.

Each row in which the flat tubular single cells 200, 300, 400, 500, 600, and 700 are stacked is stacked in the same manner as the solid oxide fuel cell stack structure shown in FIG. 4A, 4a, 4b, 4c and 4d. Also, the first, second, third and fourth connecting members 110, 120, 130 and 140, which are applied in the lamination of the respective rows, Second, third, and fourth connecting members. Therefore, a detailed description thereof will also be given with reference to FIGS. 4A, 4B, 4C, and 4D.

The connecting member 100 includes a first connecting member 110 for connecting the third connecting members 130 disposed at the uppermost portion of the respective columns, And an eighth connecting member 160 for connecting the first connecting members 150 and the fourth connecting members 140 disposed at the lowermost portions of the respective columns.

The seventh linking member 150 may have a plate shape contacting the upper surfaces of the first external contacts 133 of the third linking members 130. [ For example, the seventh linking member 150 may have a rectangular plate shape covering upper surfaces of the first external contacts 133 as shown in Figs. 6A and 6B. Alternatively, the seventh linking member 150 may be formed to cover only a part of the upper surfaces of the first external contacts 133, and may be deformed into a shape other than a rectangular plate.

The eighth connecting member 160 may have a plate shape contacting the upper surfaces of the second external contacts 143 of the fourth connecting members 140. For example, the eighth connector 160 may have the same or similar configuration as the seventh connector 150 as shown in Figs. 6A and 6B. Alternatively, the eighth connecting member 160 may have a different configuration from the seventh connecting member 150. [

Referring to FIG. 7, it can be seen that the solid oxide fuel cell stack shown in FIG. 6 has the same circuit configuration as the two solid oxide fuel cell stacks shown in FIG. 4A are connected in parallel. In FIG. 7, the voltage and the internal resistance generated by the first and second battery units are respectively represented by 'V' and 'r', and the first and second battery units generate the same voltage, Resistance.

Example  3

FIG. 8A is a perspective view showing a solid oxide fuel cell stack according to Embodiment 3 of the present invention, FIG. 8B is a perspective view showing the first connector shown in FIG. 8A, FIG. 8C is a cross- FIG. 8D is a perspective view of the third linking member shown in FIG. 8A, and FIG. 8E is a perspective view of the fourth linking member shown in FIG. 8A. FIG. 9 is an equivalent circuit diagram of the solid oxide fuel cell stack shown in FIG. 8A. FIG.

8A, 8B, 8C, 8D and 8E, the solid oxide fuel cell stack according to the present embodiment includes a plurality of flat tubular unit cells 200, 300, 400, 500, 600, and 700, and a connection member 100 that electrically connects the two electrodes.

The connection member 100 is formed of a conductive material. For example, the coupling member 100 may be made of a conductive ceramic or a metal. The metal that can be used for the connection member 100 may include platinum (Pt), silver (Ag), nickel (Ni), stainless steel, crofer, and the like.

The connecting member 100 includes a first connecting member 110 and a second connecting member 120. The flat tubular unit cell 200 of the first row is disposed between the cathode electrode contacts 113 and 123 and the anode electrode contacts 111 and 121 of the first and second connectors 110 and 120 as shown in FIGS. The structure of the first and second connecting members 110 and 120 is the same as that of the first and second connecting members 110 and 120 except that one flat tubular single cell 500 and two flat tubular single cells 200 and 500 are disposed. 4B, and 4C, respectively. Therefore, a detailed description of the first and second connectors 110 and 120 shown in Figs. 8A, 8B, and 8C is given as a description of the first and second connectors shown in Figs. 4A, 4B, and 4C , And only differences between them will be described below.

The first through fourth flat tubular single cells 200 are successively stacked in the first column and the first through fourth flat tubular single cells 200 stacked successively in the second column and at the same height as the first through fourth flat tubular single cells 200 of the first row In the fifth through eighth flat tubular single cells 500 to be arranged, the first anode electrode contact portion 111 of the first connector 110 is connected to the second current collectors of the first and fifth flat tubular single cells, The first and second cathode electrode contact portions 113 and 113 of the first and second connection members 110 and 110 are disposed between the first current collectors of the first and second flat tubular single cells 1 and 2 and the first current collectors of the sixth flat tubular single cells, 2 air cathodes and the first air electrodes of the third and seventh flat tubular unit cells, and the first connecting portion 115 of the first connecting member 110 is connected to the second air electrode of the second flat tubular unit cell supporting portion And is electrically connected to the first anode electrode contact portion 111 and the first anode electrode contact portion 115 by being disposed on the third side. The second anode electrode contacting portion 121 of the second connecting member 120 is disposed between the second current collectors of the second and sixth flat tubular single cells and the first current collectors of the third and seventh tubular single cells And the second air electrode contacting portion 123 of the second connecting member 120 contacts both the second air electrodes of the third and seventh flat tubular single cells and the first air electrodes of the fourth and eighth flat tubular single cells 120. [ And the second connection portion 125 of the second connection member 120 is disposed on the fourth side surface of the seventh flat tubular single cell supporting portion so that the second fuel electrode contacting portion 121 and the second air electrode The contact portion 123 is electrically connected.

The second electrode unit may not be formed on the top flat tubular single cells 300 and 600 among the outermost flat tubular single cells 300, 400, 600, and 700, and the lowermost flat tubular single cells 400 and 700, The first electrode portion may not be formed. In this case, the coupling member 100 includes a third connecting member 130 for connecting the first anode of the top flat tubular single cells 300 and 600 to the outside, and a second connecting member 130 for connecting the second anode of the lowermost flat tubular single cells 400 and 700, And a fourth connector 140 for connecting the air electrode to the outside.

The third connecting member 130 may have a configuration similar to that of the first connecting member 110. Specifically, the third connection member 130 includes flat tubular unit cells 200 and 500 adjacent to the first current collectors of the top flat tubular unit cells 300 and 600 and the top flat tubular unit cells 300 and 600, A first external contact portion 133 disposed on an upper portion of the top flat tubular unit cells 300 and 600 and connected to the outside, and a second external contact portion 133 disposed in the first column, And a third connection portion 135 disposed on the third side of the support portion of the uppermost flat tubular single cell 300 and electrically connecting the third anode electrode contact portion 131 and the first external contact portion 133 . The third fuel electrode contacting portion 131, the first external contacting portion 133 and the third connecting portion 135 of the third connecting member 133 are connected to the first fuel electrode contacting portion 111 of the first connecting material 100, 113 and the first connection part 115 of the first embodiment. The first external contact portion 133 of the third connection member 130 may have a different configuration from the first air electrode contact portion 113 of the first connection member 110. [ For example, the width of the first external contact portion 133 may be larger or smaller than the width of the first air electrode contact portion 113, and the length of the first external contact portion 133 may be longer than the length of the first air electrode contact portion 113 May be larger or smaller. The third connection member 130 may have a configuration similar to that of the second connection member 120 according to the number of flat tubular unit cells stacked.

The fourth connecting member 140 is connected to the first air electrode of the flat tubular unit cells 200 and 500 adjacent to the second air electrode and the lowermost tubular unit cells 400 and 700 of the lowermost flat tubular single cells 400 and 700, A second external contact portion 143 disposed under the lowermost flat tubular single cells 400 and 700 and connected to the outside and a lowermost flat tubular single cell 400 of the first row, (Not shown) disposed on the third side of the supporting portion of the lowermost flat tubular unit cell 700 of the second row or the fourth side of the supporting portion of the lowermost flat tubular unit battery 700 of the second row and electrically connecting the fourth air electrode contacting portion 141 and the second external contacting portion 143 4 connection portion 145. [ The fourth air electrode contacting portion 141 and the fourth connecting portion 145 of the fourth connecting member 140 are identical to the air electrode contacting portions 113 and 123 and the connecting portions 115 and 125 of the first or second connecting members 110 and 120 Lt; / RTI > The second external contact portion 143 may be formed of a plurality of members similar to the anode contact portions 111 and 121 of the first and second connecting members 110 and 120. However, . 4E shows a second external contact 143 in the form of a rectangular plate, but the present invention is not limited thereto, and the shape of the second external contact 143 can be variously changed as needed. Also, the second external contact 143 may be formed so as to protrude outward across the lowermost flat type single cells 400, 700.

Referring to FIG. 9, when the plurality of flat tubular unit cells are electrically connected to each other using the connector 100 as shown in FIG. 8A, the first battery units and the second battery units may be formed as shown in the circuit diagram of FIG. 9 Respectively. In FIG. 9, the voltage and the internal resistance generated by the first and second battery units are respectively represented by 'V' and 'r', and the first and second battery units generate the same voltage, Resistance.

Example  4

FIG. 10 is a perspective view showing a solid oxide fuel cell stack according to the fourth embodiment of the present invention, FIG. 11A is a perspective view of the first and second connecting members shown in FIG. 10, and FIG. 11B is a cross- 3 is a perspective view of the connector. 12 is an equivalent circuit diagram of the solid oxide fuel cell stack shown in FIG.

10, 11A, and 11B, the solid oxide fuel cell stack according to the fourth embodiment of the present invention includes a plurality of flat tubular unit cells 200 and a connecting member 100.

Each of the plurality of flat tubular unit cells 200 has the same configuration as the flat tubular unit cell shown in FIG. Therefore, a detailed description thereof will be omitted with reference to FIG. The plurality of flat tubular unit cells 200 are stacked along the third direction Z and each flat tubular unit cell 200 includes a first battery unit 230, a support unit 210, And 250 are arranged in this order.

The connecting member 100 electrically connects the first battery units 230 and the second battery units 250 of the flat tubular unit cells 200 arranged in a line. The connection member 100 is formed of a conductive material. For example, the coupling member 100 may be made of a conductive ceramic or a metal. The metal that can be used for the connection member 100 may include platinum (Pt), silver (Ag), nickel (Ni), stainless steel, crofer, and the like. The connection member 100 includes a first connection member 110, a second connection member 120, and a third connection member 130.

In the first and second flat tubular unit cells 200 arranged in series, the first coupling member 110 includes a first anode electrode contact portion 111 which contacts the first current collector 270 of the first flat tubular unit cell, , A first air electrode (255) disposed between the second air electrode (255) of the first flat tubular unit cell and the first air electrode (235) of the second flat tubular unit cell and in contact with the second air electrode A first connection portion 115 which is disposed on the third side of the cathode electrode contact portion 113 and the support portion 210 of the first flat tubular unit cell and connects the first anode electrode contact portion 111 and the first air electrode contact portion 113 .

The second connection member 120 is disposed between the second current collector 290 of the first flat tubular unit cell and the first current collector 270 of the second flat tubular unit cell, A second anode electrode contact portion 123 and a second anode electrode contact portion 121 which are in contact with the current collector 270 and in contact with the second air electrode 255 of the second flat tubular single cell, And a second connection part 125 for connecting the air electrode contact part 123. In an embodiment of the present invention, the second connection portion 125 may be disposed on the third side of the support portion of the third flat tubular single cell. In this case, the second connecting member 120 has substantially the same configuration as the first connecting member 110. Alternatively, in another embodiment of the present invention, the second connection portion 120 may be disposed on the fourth side of the support portion 210 of the third flat tubular single cell opposite to the third side of the support portion 210 of the third flat tubular single cell. As shown in FIG. In this case, the first connector 110 and the second connector 120 are arranged alternately. In this case, since the first and second coupling members 110 and 120 have the same or similar construction as the first and second coupling members described with reference to FIGS. 4A, 4B and 4C, a further description thereof will be omitted do.

The third connection member 130 is disposed between the first flat tubular unit cell and the second flat tubular unit cell, and the second current collector 290 of the first flat tubular unit cell and the first air electrode (235). For example, the third connecting member 130 may include a base portion 131 and a stepped portion 133. The base portion 131 is disposed between the second current collector 290 of the first flat tubular unit cell and the second anode electrode contact portion 121 and is in contact with the second current collector 290 of the first flat tubular unit cell , The second anode electrode contacting portion (121) of the second connecting member (120) and the second air electrode of the first flat tubular unit cell are separated from each other. The stepped portion 133 is disposed between the second air electrode 255 of the first flat tubular unit cell and the first air electrode 235 of the second flat tubular unit cell and is connected to the first air electrode 235 of the second flat tubular unit cell, And the second air electrode 255 of the first flat tubular unit cell and the second anode electrode contact portion 121 of the second connection member 120 are separated from each other.

In the embodiment of the present invention, when the collector of the flat tubular unit cell includes the first current collecting part and the second current collecting part spaced from each other with the air electrode interposed therebetween, the base part 131 of the third connecting material, A first base portion 131b contacting the first current collector portion, and a second base portion 131c contacting the second current collector portion.

The base plate 131a may have various shapes. For example, the base plate 131a may have a rectangular plate shape having a length in the first direction X and a width in the second direction Y. [ The length of the base plate 131a may be equal to or greater than the distance from the first current collector to the second current collector of the second current collector 290 of the first flat tubular unit cell, May be smaller than the width of the first flat tubular unit cell in the second direction (Y), and may be equal to or greater than the length of the first and second current collectors in the second direction (Y). Alternatively, the width of the base plate 131a may be smaller than the length of the first and second current collectors.

The first base portion 131b and the second base portion 131c protrude from the lower surface of the base plate 131a so as to be spaced apart from each other with the second air electrode 255 of the first flat tubular unit cell interposed therebetween. The first base portion 131b is in contact with the first current collector and is spaced apart from the second air electrode 255 of the first flat tubular unit cell. The second base portion 131c is in contact with the second current collector and is spaced apart from the second air electrode 255 of the first flat tubular unit cell. The lower surface of the base plate 231a is spaced apart from the second air electrode 255 of the first flat tubular unit cell by a predetermined distance. That is, the base portion 131 contacts the second current collector 290 of the second flat tubular unit cell, and does not contact the second air electrode 255 of the second flat tubular unit cell.

The stepped portion 133 protrudes from the upper surface of the base plate 131a and contacts the first air electrode 235 of the second flat tubular unit cell. The step 133 does not contact the first current collector 270 of the second flat tubular unit cell. The upper surface of the stepped portion 133 is disposed at a position higher than the upper surface of the base plate 131a so as to form a step with the upper surface of the base plate 131a. With this configuration, the stepped portion 133 can be in contact with the first air electrode 235 of the second flat tubular unit cell without contacting the second air electrode 255 of the first flat tubular unit cell . In addition, even if the step 133 contacts the first air electrode 235 of the second flat tubular unit cell, the base plate 131a is in contact with the first current collector 270 of the second flat tubular unit cell, Or the fuel electrode contact portions 111 and 121 of the second connection members 110 and 120, respectively.

10 and 11B illustrate a stepped portion 133 having a rectangular parallelepiped shape, a first base portion 131b and a second base portion 131c. However, the present invention is not limited thereto, The base portion 131b and the second base portion 131c may be deformed into various shapes. The base plate 131a, the first base 131b, the second base 131b and the step 133 of the third link 130 may be integrally formed.

Among the flat tubular single cells 200 disposed at the outermost periphery, the third connecting member 130 disposed on the top of the top flat tubular unit cell 200 may be electrically connected to the outside. Alternatively, the third connecting member 130 may not be disposed on the uppermost flat tubular unit cell 200. In this case, the second current collector 290 of the uppermost tubular unit cell 200 may be directly connected to another Or may be electrically connected to the outside using a member.

The first air electrode 235 of the lowermost flat tubular unit cell 200 among the flat tubular single cells disposed at the outermost portion may be connected to the outside through the direct or another member.

Referring to FIG. 12, in the stacked solid oxide fuel cell stack, as shown in FIG. 10, the first cell units and the second cell units formed in the plurality of flat tubular unit cells are connected in series. 12, the voltage and the internal resistance generated by the first and second battery units are respectively represented by 'V' and 'r', and each of the first and second battery units generates the same voltage, It is assumed that it has resistance

Example  5

FIG. 13 is a perspective view illustrating a solid oxide fuel cell according to a fifth embodiment of the present invention, FIG. 14 is a perspective view of the first connection member shown in FIG. 13, and FIG. 15 is a perspective view of the second connection member shown in FIG. 13 .

Referring to FIGS. 13, 14 and 15, the solid oxide fuel cell according to the fifth embodiment of the present invention includes a flat tubular unit cell 200 and a connecting member 100.

Since the flat tubular unit cell 200 has the same configuration as the flat tubular unit cell described with reference to FIG. 1, a detailed description thereof will be omitted.

The connection member 100 connects the first battery unit 230 and the second battery unit 250 of the flat tubular unit battery 200 in parallel. The connection member 100 includes a first connection member 110 for electrically connecting the first air electrode 235 of the first battery unit 230 to the second air electrode 255 of the second battery unit 250, And a second connection member 130 for electrically connecting the first fuel electrode 231 of the second electrode unit 230 and the second fuel electrode 251 of the second electrode unit 250.

The first connection member 110 includes a first air electrode contact portion 111 in contact with the first air electrode 235 of the first electrode unit 230 and a second air electrode contact portion 111 in contact with the second air electrode 255 of the second electrode unit 250. And a first connection part 115 which is disposed on the third side surfaces of the first and second air electrode contact parts 113 and 210 and connects the first air electrode contact part 111 and the second air electrode contact part 113. [

The first connection part 115 extends in the first direction X along the third side of the support part 210. [ The first and second air electrode contacting portions 111 and 113 extend from the first connecting portion 115 in the second direction Y and the flat tubular unit battery 200 (200) extends between the first and second air electrode contacting portions 111 and 113. Is inserted. The first cathode electrode contact portion 111 may have various shapes. For example, the first cathode electrode contact portion 111 may have a rectangular plate shape having a length in the second direction Y and a width in the first direction X. [ In this case, it is preferable that the length of the first air electrode contact portion 111 is smaller than or equal to the width of the flat tubular unit cell 200 in the second direction Y. That is, it is preferable that the first air electrode contact portion 111 extending from the first connection portion 115 disposed on the third side of the support portion 210 does not protrude beyond the fourth side of the support portion 210. The width of the first air electrode contact portion 111 may be greater than or equal to the width of the first air electrode 235 in the first direction X. [ Alternatively, the width of the first air electrode contact portion 111 may be smaller than the width of the first air electrode 235. Since the second air electrode contact portion 113 has the same or similar structure as the first air electrode contact portion 11, a detailed description thereof will be omitted.

The second connection member 130 includes a first anode electrode contact portion 131 that contacts the first current collector 270 of the flat tubular unit cell 200 and a second anode electrode contact portion 131 that contacts the second current collector 290 of the flat tubular unit cell 200. [ And a second connecting portion 135 that is disposed on the fourth side of the second anode electrode contacting portion 133 and the supporting portion 210 and connects the first anode electrode contacting portion 131 and the second anode electrode contacting portion 133 have.

The second connection portion 135 extends in the first direction X along the fourth side of the support portion 210. The first and second anode electrode contacting portions 131 and 133 extend from the second connecting portion 135 in the second direction Y and are connected between the first and second anode electrode contacting portions 131 and 133 by a flat tubular unit cell 200 Is inserted.

The first and second current collectors 270 and 290 of the flat tubular unit cell 200 are connected to the first current collectors 271 and 291 and the second current collector The first and the second fuel electrode contacts 131 and 133 are connected to the first and second current collectors 271 and 271 and the first and second current collectors 273 and 273, And 293, respectively, of the first member 131b and the second member 133b.

 Specifically, the first and second members 131a and 131b of the first anode electrode contacting portion 131 extend from the second connecting portion 135 in the second direction Y, And are disposed apart from each other with the contact portion 111 interposed therebetween. That is, the first and second members 131a and 131b of the first anode electrode contacting portion 131 do not contact the first air electrode 235 and the first cathode electrode contacting portion 111 of the first connecting member 110. The first and second members 131a and 131b of the first anode electrode contacting portion 131 may have various shapes. For example, the first and second members 131a and 131b of the first anode electrode contact portion 131 may have a rectangular plate shape having a length in the second direction Y and a width in the first direction X have. In this case, it is preferable that the length of the first and second members 131a and 131b of the first anode electrode contacting portion 131 is smaller than the width of the flat tubular single cell 200 in the second direction Y. That is, the first and second members 131a and 131b of the first anode electrode contact portion 131 extending from the second connection portion 135 disposed on the fourth side of the support portion 210 are connected to the third It is preferable not to protrude outward beyond the side surface. The widths of the first and second members 131a and 131b of the first anode electrode contacting portion 131 are set such that the widths of the first and second current collectors 270a and 270b in the first direction X Is preferably equal to or greater than the width of The first and second members 133a and 133b of the second anode electrode contact portion 133 have the same or similar shape as the first and second members 131a and 131b of the first anode electrode contact portion 131, A detailed description thereof will be omitted.

FIG. 16 is an exploded perspective view showing a solid oxide fuel cell stacked structure in which a flat unit cell is stacked using the connecting material shown in FIGS. 13 to 15, FIG. 17 is an equivalent perspective view of the solid oxide fuel cell stack shown in FIG. Circuit diagram.

Referring to FIG. 16, the solid oxide fuel cell stack includes a plurality of flat tubular unit cells 200 and a connecting member 100.

A plurality of flat tubular unit cells (200) are arranged in a line along the third direction (Z). Each of the plurality of flat tubular single cells 200 is arranged to be arranged from the bottom in the order of the first battery 230, the support 210 and the second battery 250.

The connecting member 100 includes a first connecting member 110 electrically connected to the first air electrodes 235 and the second air electrodes 255 of the plurality of flat tubular unit cells 200, (130) electrically connected to the first fuel electrodes (231) and the second fuel electrodes (151) of the first fuel electrode (200).

The first connection member 110 includes a first connection portion 111 disposed on the third side surfaces of the support portion 210 of the flat tubular unit cells 200 and a second connection portion 111 extending from the first connection portion 111 in a spaced- And a plurality of cathode electrode contacts 113 extending in the Y direction. Each of the air electrode contacting portions 113 is disposed between and contacts with the first air electrode 235 and the second air electrode 255 of the adjacent flat tubular unit cells 200. The shape of each of the air electrode contacting portions 113 is the same as or similar to the shape of the first or second air electrode contacting portion described with reference to FIGS. 13 and 14, and thus a detailed description thereof will be omitted. The first connection portion 111 and the plurality of air electrode contact portions 113 may be integrally formed.

The second connection member 130 includes a second connection portion 131 disposed on the fourth side surfaces opposite to the third side surfaces of the support portion 210 of the flat tubular unit cells 200, And a plurality of fuel electrode contacting portions 133 extending from the connecting portion 131 in the second direction Y. [ Each of the anode electrode contacting portions 133 is disposed between the first current collector 270 and the second current collector 270 of the adjacent flat tubular unit cells 200 and contacts them.

The first current collector 270 of the flat tubular single cells 200 is composed of two current collectors 271 and 273 spaced apart from each other with the first air electrode 235 interposed therebetween and the flat tubular single cells 200 The second current collectors 290 of the first and second current collectors 291 and 292 are composed of two current collectors 291 and 293 spaced apart from each other with the second air electrode 255 interposed therebetween, And two members that are spaced apart from each other with a space therebetween, and which are in contact with the two current collectors, respectively. The shape of each of the anode electrode contacting portions 133 is the same as that of the first or second anode electrode contacting portion described with reference to FIGS. 13 and 15, and a detailed description thereof will be omitted. The second connection portion 131 and the plurality of fuel electrode contact portions 133 may be integrally formed.

Referring to FIG. 17, in the solid oxide fuel cell stack shown in FIG. 16, the first battery units 230 and the second battery units 250 formed in the plurality of flat tubular unit cells 200 are connected to the connecting member 100) connected in parallel. In FIG. 17, the voltage and the internal resistance generated by the first and second battery units are respectively represented by 'V' and 'r', and the first and second battery units generate the same voltage, It is assumed that it has resistance

Example  6

FIG. 18 is a perspective view showing a solid oxide fuel cell stack according to a sixth embodiment of the present invention, and FIG. 19 is a perspective view showing the connection plate shown in FIG. FIG. 20 is a perspective view of the first connection portion shown in FIG. 18, and FIG. 21 is a perspective view of the second connection portion shown in FIG.

18, 19, 20, and 21, the solid oxide fuel cell stack according to the sixth embodiment of the present invention includes a plurality of flat tubular unit cells 200 and a connecting member 100.

Each of the plurality of flat tubular unit cells 200 has the same configuration as that of the flat tubular unit battery described with reference to FIG. 1, so that a detailed description thereof will be omitted. The plurality of flat tubular single cells 200 are arranged in a line along the third direction. Each of the plurality of flat tubular single cells 200 is arranged to be arranged from the bottom in the order of the first battery 230, the support 210 and the second battery 250.

The connection member 100 is formed of a conductive material. For example, the coupling member 100 may be made of a conductive ceramic or a metal. The metal that can be used for the connection member 100 may include platinum (Pt), silver (Ag), nickel (Ni), stainless steel, crofer, and the like. The connecting member 100 includes a plurality of connecting plates 110, a first connecting portion 120, and a second connecting portion 130.

Each of the connection plates 110 includes an insulation plate 111, an air electrode contact portion 113 formed on the insulation plate 111 and an anode electrode contact portion 115 formed on the insulation plate 111 so as to be spaced apart from the air electrode contact portion 113 . The insulating plate 111 is formed of an insulating material. For example, the insulating plate 111 may be formed of an insulating ceramic material. The cathode electrode contact portion 113 and the anode electrode contact portion 115 may be formed by coating a conductive material on the insulating plate 111. For example, the cathode electrode contact portion 113 and the anode electrode contact portion 115 may be formed to surround a part of the insulating plate 111. [ That is, the cathode electrode contact portion 113 and the anode electrode contact portion 115 may be continuously formed along the upper surface, the lower surface, and two mutually facing side surfaces of the insulating plate 111.

The connection plates 110 are disposed between the adjacent flat tubular unit cells 200, the top of the top flat tubular unit cell 200, and the bottom of the bottom tubular unit cell 200. In each connecting plate 110 disposed between the adjacent flat tubular unit cells 200, the anode electrode contacting portion 115 is formed by the second current collector 290 of the lower flat tubular single cell, And the cathode electrode contacting portion 113 is disposed between the second air electrode 255 of the lower flat tubular unit cell and the first air electrode 235 of the upper flat tubular unit cell And contacts them.

The anode electrode contacting portion 115 is in contact with the second current collector 290 of the top flat tubular unit cell 200 and the cathode electrode contacting portion 115 113 are in contact with the second air electrode 255 of the uppermost flat tubular unit cell 200. The fuel electrode contacting portion 115 is in contact with the first current collector 270 of the lowermost flat tubular unit cell 200 and the cathode electrode contacting portion 115 113 are in contact with the first air electrode 235 of the lowermost flat tubular unit cell 200.

The air electrode contact portion 113 of each of the connection plates 110 contacting the first or second air electrodes 235 and 255 of the flat tubular unit cells 200 is provided with projections and / Or a recess may be formed. The protrusions and recesses may be formed by forming protrusions and / or recesses on the surface of the insulating substrate 111, and then uniformly coating them with a conductive material thereon. The protrusions and recesses are the same as or similar to the protrusions and recesses described with reference to FIGS. 3A, 3B, and 3C, and therefore, a detailed description thereof will be omitted.

The width of the connection plate 110 in the direction of wrapping the cathode electrode contact portion 113 and the anode electrode contact portion 115 in the second direction Y is formed to be equal to or greater than the width of each of the corresponding flat tubular unit cells 200 do. Therefore, the cathode electrode contact portion 113 and the anode electrode contact portion 115 formed on the side surfaces of the connection plate 110 protrude from the side surfaces of the flat tubular unit cells 200.

The first connection part 120 protrudes from the side surfaces of the flat tubular unit cells 200 and contacts the air electrode contact parts 113 formed on the side surfaces of the connection plate 110. For example, the first connection portion 120 may include a first member that protrudes from the side surfaces of the flat tubular unit cells 200 and contacts the air electrode contact portions 113 formed on the first side surfaces of the connection plates 110, A second member 123 contacting the air electrode contact portion 113 formed on the second side faces of the first side faces of the connection plates 110 and the air electrode contact portion 113 of the lowermost connection plate 110 And a third member 125 disposed below and in contact with the first member 123 and electrically connecting the first member 123 and the second member 125. [

Specifically, the third member 125 of the first connection portion 120 covers the air electrode contact portion 113 of the lowermost connection plate 110 and is disposed apart from the fuel electrode contact portion 115 of the lowermost connection plate 110. The third member 125 of the first connection part 120 may have various shapes. For example, the third member 125 of the first connection part 120 may have a rectangular plate shape having a width in the first direction X and a length in the second direction Y. The width of the third member 125 of the first connection portion 120 may be greater than or equal to the width of the air electrode contact portion 113 of the lowermost connection plate 110 in the first direction X. [ The width of the third member 125 of the first connection portion 120 may be smaller than the width of the air electrode contact portion 113 of the lowermost connection plate 110 in the first direction X. [ The length of the third member 125 of the first connection part 120 is preferably equal to or greater than the width of the lowermost connection plate 110 in the second direction Y. [

The first member 121 of the first connection part 120 extends in the third direction Z along the first side of the connection plates 110 from the third member 125 of the first connection part 120. The first member 121 of the first connection part 120 may have various shapes. For example, the first member 120 of the first connection part 120 may have a rectangular plate shape having a width in the first direction X and a length in the third direction Z. The width of the first member 121 of the first connection part 120 may be the same as the width of the third member 125 of the first connection part 120. [ The width of the first member 121 of the first connection portion 120 may be larger or smaller than the width of the third member 125 of the first connection portion 120. [ The length of the first member 121 of the first connection part 120 is in contact with the air electrode contact part 113 formed on the connection plate 110 and the second connection part 130 do not contact with the sixth member 135 of the second member 130. The second member 123 of the first connection part 120 extends from the third member 125 of the first connection part 120 in the third direction Z along the second side of the connection plates 110 The first member 121 of the first connection portion 120 is the same as that of the first member 121, so a detailed description thereof will be omitted.

The second connection part 130 protrudes from the side surfaces of the flat tubular unit cells 200 and contacts the anode electrode contact parts 115 formed on the side surfaces of the connection plate 110. For example, the second connection part 130 may include a fourth member that contacts the anode electrode contact parts 115 formed on the first side surfaces of the connection plates 110 protruding from the side surfaces of the flat tubular unit cells 200, The first member 133 contacting the anode electrode contact portion 115 formed on the second side surfaces of the connecting plate 110 and the anode electrode contacting portion 115 of the uppermost connecting plate 110, And a sixth member 135 connecting the first member 131 and the fifth member 133 to each other. When the first and second current collectors 270 and 290 of the flat tubular unit cell 200 are composed of two current collectors separated with the air electrodes 235 and 255 interposed therebetween, 115 may also be composed of two members spaced apart from each other with the air electrode contact portion 113 interposed therebetween. The fourth and fifth members 131 and 133 of the second connection portion 130 which are in contact with the fuel electrode contact portion 115 of the connection plate 110 are also connected to the two members of the fuel electrode contact portion 115, Members 131a, 131b, 133a, and 133b.

Specifically, the sixth member 135 of the second connection part 130 is disposed on the uppermost connection plate 110 and contacts the fuel electrode contact part 115 of the uppermost connection plate 110. The sixth member 135 of the second connection portion 130 should not contact the air electrode contact portion 113 of the uppermost connection plate 110 and the sixth member 135 of the second connection portion 130 should be in contact with the uppermost connection plate The sixth member 135 of the second connection part 130 may be formed to be spaced apart from the air electrode contact part 113 of the uppermost connection plate 110 in order to prevent the contact part 113 from contacting with the air electrode contact part 113 of the uppermost connection part 110. In order to prevent the sixth member 135 of the second connection portion 130 from contacting the air electrode contact portion 113 of the uppermost connection plate 110, the upper surface of the uppermost connection plate 100 may be provided with the air electrode contact portion 113 may not be formed.

The fourth member 131 of the second connection unit 130 extends from the sixth member 135 of the second connection unit 130 along the first side of the connection plates 110 in the third direction Z, And may include two members 131a and 131b disposed between the first members 121 of the first connection unit 120 and spaced apart from each other. The fifth member 133 of the second connection part 130 extends from the sixth member 135 of the second connection part 130 in the third direction Z along the second side of the connection plates 110, And two members 133a and 133b positioned between the second members 123 of the first connection part 120 and spaced apart from each other.

The solid oxide fuel cell stack shown in Fig. 18 is connected in the same way as the circuit diagram shown in Fig.

According to the embodiments of the present invention, the flat tubular unit cells having the first battery unit and the second battery unit, which are independent of each other, are stacked and connected to each other using the connecting material to form the solid oxide fuel cell stack, Current and / or high voltage.

While the present invention has been described in connection with what is presently considered to be practical and exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

100, 110, 120: connecting material 200, 300, 400: flat tubular single cell
210: support part 211:
230: first electrode unit 250: second electrode unit
270: 1st collection 290: 2nd collection

Claims (16)

delete A support having a flow path; A first fuel electrode disposed at a lower portion of the support portion, a first electrolyte disposed at a lower portion of the first fuel electrode, and a first air electrode disposed at a lower portion of the first electrolyte; A second fuel electrode disposed on the upper portion of the support portion and spaced apart from the first fuel electrode, a second electrolyte disposed on the second fuel electrode, and a second air electrode disposed on the second electrolyte and spaced apart from the first air electrode, A plurality of flat tubular unit cells each including a second battery unit provided therein; And
And a connection member electrically connecting the first battery units of the plurality of flat tubular unit cells to the second battery units,
Each of the plurality of flat tubular single cells
A first current collector which is in contact with the first fuel electrode exposed through the opening of the first electrolyte and is spaced apart from the first air electrode; And
And a second current collector which is in contact with the second fuel electrode exposed through the opening of the second electrolyte and is spaced apart from the second air electrode. 3. The apparatus of claim 2, wherein the plurality of flat tubular type cells include first and second flat tubular type sub-
Wherein the connecting member comprises: a first anode electrode contact portion electrically connected to a first current collector of the first flat tubular unit cell; A second air electrode of the first flat tubular unit cell and a second air electrode of the second tubular unit cell are arranged between the second air electrode of the first tubular unit cell and the first air electrode of the second tubular unit cell, A first air electrode contact portion electrically connected to the air electrode; And a first connection member disposed on a first side of the first flat tubular unit cell and having a first connection portion for electrically connecting the first anode electrode contact portion and the first air electrode contact portion, Oxide fuel cell stack. 4. The battery pack according to claim 3, wherein the connecting member is disposed between a second current collector of the first flat tubular unit cell and a first current collector of the second tubular single cell, And a second anode electrode contact electrically connected to the first current collector of the second flat tubular unit cell; A second air electrode contact portion electrically connected to the second air electrode of the second tubular unit cell; And a second connection portion which is disposed on a second side of the second tubular unit cell facing the first side of the first tubular type single cell and electrically connects the second anode electrode contact portion and the second air electrode contact portion, And a second connection member including the first connection member and the second connection member. 5. The battery pack according to claim 4, wherein a plurality of protrusions or recesses are formed in the first air electrode contact portion which is in contact with the second air electrode of the first flat tubular unit cell and the first air electrode of the second flat tubular unit cell,
And a plurality of protrusions or recesses are formed in the second air electrode contacting portion that is in contact with the second air electrode of the second flat tubular unit cell. 5. The battery pack according to claim 4, wherein the first current collectors of the first and second flat tubular single cells each include a first current collector and a second current collector spaced apart from each other with the first air electrode therebetween,
The second current collectors of the first and second flat tubular single cells each include a third current collector and a fourth current collector spaced apart from each other with the second air electrode therebetween,
Wherein the first fuel electrode contact portion is in contact with a first member in contact with the first current collector of the first current collector of the first flat tubular single cell and a second current collector of the first current collector of the first flat tubular single cell And a second member,
The second fuel electrode contacting portion includes a third member contacting the first current collecting portion of the second current collector of the first flat tubular unit cell and the first current collecting portion of the first current collector of the second flat tubular single cell, And a fourth member that is in contact with the second current collector of the second current collector of the single-tubular unit cell and the second current collector of the second current collector of the first flat tubular unit cell. Laminated structure. 3. The apparatus of claim 2, wherein the plurality of flat tubular type cells include first and second flat tubular type sub-
The connecting member
A first fuel electrode contact portion electrically connected to a first current collector of the first tubular single cell; A first air electrode contact disposed between the second air electrode of the first tubular unit cell and the first air electrode of the second tubular unit cell and in contact with the second air electrode of the first tubular unit cell; And a first connecting member disposed on a first side of the first tubular unit cell and including a first connecting portion electrically connecting the first anode electrode contacting portion and the first cathode contacting portion;
A second anode electrode contact portion disposed between the second current collector of the first tubular type single cell and the first current collector of the second tubular type single cell and in contact with the first current collector of the second tubular type single cell; A second air electrode contact portion electrically connected to the second air electrode of the second tubular unit cell; And a second connecting portion disposed on a first side of the second tubular unit cell adjacent to the first side of the first tubular unit cell and electrically connecting the second anode electrode contact portion and the second air electrode contact portion, A second coupling member comprising; And
A first flat tubular unit cell and a second flat tubular unit cell, wherein the first flat tubular unit cell and the second flat tubular unit cell are electrically connected to each other, 3 < / RTI > linking material. 8. The connector according to claim 7, wherein the third connector
And a second fuel electrode contact portion which is disposed between the second current collector and the second fuel electrode contact portion of the first tubular type single cell and contacts the second current collector of the first tubular type single cell, A base portion spaced apart from the second air electrode of the unit cell; And
And a second air electrode of the second tubular unit cell is disposed between the second air electrode of the first tubular unit cell and the first air electrode of the second tubular unit cell and is in contact with the first air electrode of the second tubular unit cell, And a stepped portion that is spaced apart from the first anode electrode and the second anode electrode contacting portion of the solid oxide fuel cell stack structure. 9. The battery pack according to claim 8, further comprising: a first air electrode contact portion of the first connecting member that contacts the second air electrode of the first flat tubular unit cell, a second air electrode contacting portion of the third connecting member, And a plurality of protrusions or recesses are formed in the second air electrode contacting portion of the second connecting member in contact with the second air electrode of the second flat tubular unit cell. The connector according to claim 2,
A first anode electrode contact portion in contact with a first current collector of the first flat tubular single cell among the plurality of flat tubular single cells; A second anode electrode contact portion contacting the second current collector of the first tubular single cell; And a first connecting member disposed on a first side of the first tubular unit cell and having a first connecting portion for electrically connecting the first and second anode electrode contacts; And
A first air electrode contact portion contacting the first air electrode of the first tubular single cell; A second air electrode contact portion contacting the second air electrode of the first tubular single cell; And a second connecting member disposed on a second side of the first flat tubular unit cell facing the first side and having a second connecting portion for electrically connecting the first and second air electrode contacting portions Wherein the solid oxide fuel cell stack structure is made of the same material as the solid oxide fuel cell stack structure. 11. The battery module according to claim 10, wherein the first connecting member is in contact with a second current collector of a second flat tubular single cell adjacent to the first flat tubular single cell among the plurality of flat tubular single cells and is electrically connected to the first connecting unit Further comprising a third anode electrode contact portion,
The second connecting member further comprises a third air electrode contact portion which is in contact with the second air electrode of the second flat tubular single cell and is electrically connected to the second connecting portion,
Wherein the second anode electrode contact portion is in contact with the second current collector of the first flat tubular single cell and the first current collector of the second tubular type single cell and the second air electrode contact portion contacts the first current collector of the first flat tubular single cell 2 air electrode and the first air electrode of the second flat tubular unit cell. 12. The battery pack according to claim 11, wherein the first air electrode contact portion, the second air electrode of the first flat tubular unit cell and the first air electrode of the second tubular unit cell, which are in contact with the first air electrode of the first flat tubular unit cell, Wherein a plurality of protrusions or recesses are formed in the third air electrode contacting portion which is in contact with the second air electrode contacting portion and the second air electrode contacting portion of the second flat tubular unit cell which are in contact with each other. The connector according to claim 2,
An insulating plate, an air electrode contact portion formed on the insulating plate, and an anode electrode contact portion formed on the insulating plate so as to be spaced apart from the air electrode contacting portion, and disposed between the adjacent flat tubular single cells of the plurality of flat tubular single cells A plurality of connection plates;
A first connection part for electrically connecting the air electrode contact parts of the plurality of connection plates; And
And a second connection part for electrically connecting the fuel electrode contacts of the plurality of connection plates. 14. The method as claimed in claim 13, wherein the air electrode contact portion comprises a second air electrode of the first flat tubular unit cell and a first air electrode of the second flat tubular unit cell adjacent to the first flat tubular unit cell, Contact,
Wherein the anode electrode contact portion is in contact with the second current collector of the first flat tubular single cell and the first current collector of the second tubular single cell. 15. The solid oxide fuel cell stack structure according to claim 14, wherein the first and second connection portions are in contact with the cathode electrode contact portion and the anode electrode contact portion, respectively, formed on opposite sides of the insulating plate. 15. The solid oxide fuel cell stack structure according to claim 14, wherein a plurality of protrusions or recesses are formed in the air electrode contacting portion.

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