Self-sealing solid oxide fuel cell stack and applications thereof

Abstract

This invention discloses a self-sealing solid oxide fuel cell stack and its application, relating to the field of solid oxide battery technology. It includes a stack mounting assembly, a first current collector, a second current collector, and a cell repeating unit. The cell repeating unit includes at least two single-cell modules and a connector disposed between adjacent single-cell modules. Each single-cell module includes a self-sealing single cell, a cell mounting component, and a current collector. The self-sealing single cell includes an anode side, a cathode side, an air inlet end, and an air outlet end. The anode and cathode sides of the self-sealing single cell are spaced apart from the connector via the current collector. The air inlet end of the self-sealing single cell is mounted on the cell mounting component and includes an air inlet. The wall surface adjacent to the air inlet is sealed with a sealing material. The combination of the self-sealing single cell and the cell mounting component significantly reduces the sealing area and lowers the sealing difficulty, improving stack stability and assembly flexibility.

Description

Technical Field

[0001] This invention relates to the field of solid oxide battery technology, and more specifically, to a self-sealing solid oxide fuel cell stack and its application. Background Technology

[0002] A solid oxide fuel cell (SOCF) is an electrochemical device that directly converts the chemical energy of fuel and oxidant into electrical energy. Its basic structural units mainly include an anode, a cathode, and an electrolyte. Its reverse operation is called a solid oxide electrolyzer, which, under applied voltage and high temperature conditions, can electrolyze H2O to produce H2 and O2. Both are collectively referred to as solid oxide batteries, and they will play an important role in the use and production of hydrogen in the new energy field.

[0003] A single solid oxide fuel cell (SOCF) can only generate an open-circuit voltage of about 1V. Therefore, two adjacent cells need to be connected in series via connectors to form a stack with usable voltage and power output. Since one of the reactants in a SOCF is fuel gas, a stable and reliable electrical connection and airtightness must be established between the cells and the connectors. Traditional planar SOCF cells and connectors are completely separate components, requiring sealing of the entire contact plane. This results in a large sealing area, high cost, and relatively poor stability. Solving the sealing problem of planar SOCF stacks would significantly improve the reliability and service life of SOCF stacks.

[0004] In view of this, the present invention is proposed. Summary of the Invention

[0005] The purpose of this invention is to provide a self-sealing solid oxide fuel cell stack and its application.

[0006] This invention is implemented as follows:

[0007] In a first aspect, the present invention provides a self-sealing solid oxide fuel cell stack, comprising a stack fixing assembly, a first current collector, a second current collector, and a battery repeating unit.

[0008] The battery stack fixing assembly includes fastening components and a first cover plate and a second cover plate spaced apart. A first current collector, a battery repeating unit, and a second current collector are sequentially installed between the first cover plate and the second cover plate, and the first cover plate and the second cover plate are positioned by fastening components.

[0009] The battery repeating unit includes at least two single-cell components and a connector disposed between two adjacent single-cell components. Each single-cell component includes a self-sealing single cell, a battery fixing component, and a current collector. The self-sealing single cell includes an anode side, a cathode side, an air inlet end, and an air outlet end. The anode side and cathode side of the self-sealing single cell are spaced apart from the connector via the current collector end. The air inlet end of the self-sealing single cell is mounted on the battery fixing component and includes an air inlet. The wall surface adjacent to the air inlet end is sealed with a sealing material. The battery fixing component, the connector, the first current collector plate, and the first cover plate are all provided with gas inlets and gas outlets. The gas inlets are interconnected and communicate with the air inlet end of each self-sealing single cell. The gas outlets are interconnected and communicate with the air outlet end of each self-sealing single cell.

[0010] In this invention, the self-sealing single cell is a self-sealing metal-supported single cell. Specifically, it is achieved through additive manufacturing or welding, brazing, and other technologies to integrate the single cell, consisting of an anode, electrolyte, and cathode, with a metal support having a fuel gas passage structure.

[0011] The current collector connects the cathodes and anodes of adjacent cells, facilitating current transfer. Therefore, the size of the current collector is preferably close to the size of the cathode or anode side of the self-sealing cell. During cell assembly, the battery retainer is mounted on the side of the self-sealing cell, preventing it from contacting the current collector directly. Instead, it contacts the connector on the current collector surface, sealing the connector and preventing fuel leakage. This structure has fewer sealing surfaces, improving the reliability and flexibility of the fuel cell stack assembly.

[0012] Preferably, the current collector is a metal mesh, including silver mesh, nickel mesh, etc.

[0013] Preferably, the sealing material between the sealing connector and the battery fixing component is a ceramic glass sealing material.

[0014] Furthermore, the aforementioned wall surfaces adjacent to the air inlet refer to the wall surfaces adjacent vertically, horizontally, and frontally. All of these wall surfaces should be sealed to prevent gas leakage. In some embodiments, this can be understood as the contact surfaces between the self-sealing cell and the battery holder, and the contact surfaces between the battery holder and the connector, all requiring sealing.

[0015] Preferably, to facilitate battery assembly and positioning, and to reduce the sealing area, the air inlet of the self-sealing single cell is a separate tubular structure extending outside the battery body. Therefore, during sealing, only the surrounding walls of the tubular structure need to be sealed, rather than sealing the entire battery body from all sides.

[0016] Preferably, to better position the self-sealing battery and prevent it from sliding or misaligning, the self-sealing battery and the battery holder can be secured by snap-fit. In other embodiments, the self-sealing battery can also be secured by providing a limiting member on the battery holder.

[0017] In an optional embodiment, the fastening component may be, for example, a combination of bolts and nuts. After the first current collector, the second current collector, and the battery repeater unit are positioned between the first and second cover plates, they are fastened using bolts and nuts, thereby forming a compact assembly of the battery stack. In other embodiments, the fastening component may also be other existing structures, as long as they can securely hold the first cover plate, the second cover plate, and the filling material therebetween in place; this invention is not limited in this regard.

[0018] In an optional embodiment, to facilitate gas extraction, each single-cell assembly has two battery holders, which are respectively installed at the gas inlet and gas outlet of the self-sealing single cell.

[0019] Preferably, the vent end of the self-sealing single cell is also provided with a vent. The vent can be an opening directly formed on the self-sealing single cell, or it can be a tubular structure extending out of the single cell body.

[0020] In an optional embodiment, the number of gas inlets and gas outlets on the battery holder, connector, first collector plate, and first cover plate are all at least two.

[0021] That is, the battery mounting component has at least two gas inlets and at least two gas outlets, the connector has at least two gas inlets and at least two gas outlets, the first current collector has at least two gas inlets and at least two gas outlets, and the first cover plate has at least two gas inlets and at least two gas outlets. The at least two gas inlets can be used to introduce fuel gas and oxidizing gas respectively, and the at least two gas outlets can be used to discharge unreacted fuel gas and oxidizing gas, etc., as exhaust gases respectively.

[0022] Preferably, the number, shape, size, and location of gas inlets are identical across all structures to improve battery intake efficiency. Similarly, the number, shape, size, and location of gas outlets are identical across all structures to improve battery exhaust efficiency.

[0023] In an optional implementation, in order to obtain a certain power generation efficiency, the number of connectors in the battery repeating unit is 2 to 50.

[0024] In an optional embodiment, the surface of the connector adjacent to the cathode side of the self-sealing single cell is provided with a gas channel and a support ridge. The gas channel is used for the flow of oxidizing gas, and the support ridge is capable of collecting current. Preferably, the opposite side of the connector is a plane.

[0025] In an optional implementation, in order to position the various structures in the fuel cell stack and to facilitate gas intake and exhaust, the connection between the structures of two adjacent gas inlets and two adjacent gas outlets is a nested connection of concave and convex molds.

[0026] Preferably, in the nested connection structure of the convex and concave dies, the die structure is an outwardly expanding die.

[0027] Preferably, the expansion angle is 10 to 60° and the expansion depth is 0.5 to 1.5 mm.

[0028] In an optional embodiment, the first cover plate, the second cover plate, the connector, the second current collector, the first current collector, and the battery fixing component are all made of the same alloy.

[0029] In an optional embodiment, the fastening component is made of an alloy with a low coefficient of thermal expansion.

[0030] In an optional embodiment, a countersunk hole area is provided on the second cover plate for positioning the second current collector and the battery repeating unit.

[0031] Preferably, insulating material is provided between the second cover plate and the second collector plate, and between the first cover plate and the first collector plate.

[0032] Preferably, the insulating material includes any one of mica board, alumina coating, and zirconium oxide coating.

[0033] In an optional implementation, both the first and second current collectors are provided with current collector ears for connecting to external circuits.

[0034] Secondly, the present invention provides an application of a self-sealing solid oxide fuel cell stack as described in any of the foregoing embodiments in the field of batteries.

[0035] The present invention has the following beneficial effects:

[0036] This invention provides a self-sealing solid oxide fuel cell stack and its application. By employing a self-sealing single cell, the fuel gas path is located inside the self-sealing single cell, thus significantly reducing the sealing area of ​​the fuel cell stack. Simultaneously, a battery fixing component is provided at the air inlet end of the self-sealing single cell, facilitating both air intake and sealing of the battery fixing component and connectors, preventing fuel gas leakage. This structure only requires sealing the wall surface adjacent to the air inlet of the battery fixing component and connectors, greatly reducing the sealing area and improving the reliability and flexibility of fuel cell stack assembly. Attached Figure Description

[0037] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0038] Figure 1 This is a schematic diagram of the structure of the self-sealing solid oxide fuel cell stack provided in Embodiment 1 of the present invention;

[0039] Figure 2 For the present invention Figure 1 Enlarged view of the A-structure in the middle;

[0040] Figure 3 This is a schematic diagram of the structure of the battery fixing component and the self-sealing single battery snap-fit ​​provided in Embodiment 1 of the present invention;

[0041] Figure 4 This is a schematic diagram of the battery fixing component provided in Embodiment 1 of the present invention;

[0042] Figure 5 This is a schematic diagram of the front and back sides of the connector provided in Embodiment 1 of the present invention;

[0043] Figure 6 This is a schematic diagram of the structure of the first and second current collectors provided in Embodiment 1 of the present invention;

[0044] Figure 7 This is a schematic diagram of the top structure of the self-sealing solid oxide fuel cell stack provided in Embodiment 1 of the present invention;

[0045] Figure 8 This is a schematic diagram of the structure of the self-sealing solid oxide fuel cell stack provided in Embodiment 2 of the present invention;

[0046] Figure 9 For the present invention Figure 8 Enlarged view of the B-structure;

[0047] Figure 10 This is a schematic diagram of the structure of the battery fixing component and the self-sealing single battery snap-fit ​​provided in Embodiment 2 of the present invention.

[0048] Key component symbols: 100 - Self-sealing solid oxide fuel cell stack; 111 - First cover plate; 1111 - Gas inlet; 1112 - Air inlet; 112 - Second cover plate; 113 - Bolt; 114 - Nut; 120 - First collector plate; 130 - Second collector plate; 140 - Battery repeating unit; 141 - Connector; 142 - Self-sealing single cell; 1421 - Air inlet; 1422 - Air outlet; 143 - Battery fixing component; 150 - Sealing material coating position; 160 - Current collector ear. Detailed Implementation

[0049] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0050] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0051] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0052] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this invention is in use. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention. In addition, the terms "first," "second," "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0053] Furthermore, terms such as "horizontal" and "vertical" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0054] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0055] The features and performance of the present invention will be further described in detail below with reference to embodiments.

[0056] Example 1

[0057] Please see Figure 1 This embodiment provides a self-sealing solid oxide fuel cell stack 100, including a stack fixing assembly, a first current collector 120, a second current collector 130, and a battery repeating unit 140.

[0058] The battery stack fixing assembly includes a first cover plate 111, a second cover plate 112 and fastening components. The first cover plate 111 and the second cover plate 112 are spaced apart and positioned by the fastening components. A first current collector 120, a battery repeating unit 140 and a second current collector 130 are sequentially installed between the first cover plate 111 and the second cover plate 112.

[0059] In this embodiment, the fastening component is a combination structure of four sets of bolts 113 and nuts 114, located at the four corners of the first cover plate 111 and the second cover plate 112, respectively. After the first current collector 120, the second current collector 130, and the battery repeater unit 140 are arranged between the first cover plate 111 and the second cover plate 112, they are fastened using bolts 113 and nuts 114, thereby forming a compact assembly of the battery stack. In other embodiments, the fastening component can also be a clamping member with a power component, such as a cylinder-driven clamping spring.

[0060] Please see Figures 1-5The battery repeating unit 140 includes at least two single-cell assemblies and a connector 141 disposed between two adjacent single-cell assemblies. Each single-cell assembly includes a self-sealing single cell 142, a battery holder 143, and a current collector (not shown). The self-sealing single cell 142 includes an anode side, a cathode side, an air inlet end, and an air outlet end. The anode side and cathode side of the self-sealing single cell 142 are spaced apart from the connector 141 by the current collector. The air inlet end of the self-sealing single cell 142 is mounted on the battery holder. On the fixing component 143, the air inlet of the self-sealing single battery 142 includes an air inlet 1421. The wall adjacent to the air inlet 1421 is sealed with a sealing material. The battery fixing component 143, the connector 141, the first current collector 120 and the first cover plate 111 are all provided with gas inlets and gas outlets. The gas inlets are interconnected and communicate with the air inlet 1421 of each self-sealing single battery 142. The gas outlets are interconnected and communicate with the air outlet of each self-sealing single battery 142.

[0061] Please see Figure 3 In this embodiment, the self-sealing single cell 142 is a self-sealing metal-supported single cell. Specifically, it is achieved by using technologies such as thermal spraying, additive manufacturing, welding, or brazing to integrate the single cell, which consists of an anode, an electrolyte, and a cathode, with a metal support having a fuel gas passage structure.

[0062] Furthermore, the current collector is a metal mesh, and its size is the same as that of the cathode side or anode side of the self-sealing single cell 142. During assembly, the battery repeating unit 140 is formed by mounting the battery retainer 143 to the side of the self-sealing single cell 142 to form a single-cell assembly, with both components in the same plane. The single-cell assembly is connected to the connector 141 by a sealing adhesive material, and this process is repeated to form the battery repeating unit 140.

[0063] In this embodiment, to facilitate battery assembly and positioning and further reduce the sealing area, the air inlet 1421 of the self-sealing single cell 142 is a separate tubular structure extending outside the battery body. During sealing, as long as the sealing effect of the wall surface around the tubular body and the contact surface between the nearby fixing components and the connector is ensured, even if gas leakage occurs in the air passage, it will not affect the performance of the battery stack. This avoids the requirement of sealing the entire battery body around the perimeter of traditional flat-plate batteries, significantly reducing the technical difficulty of sealing the gas passage. See the specific sealing material coating location 150 for details. Figure 4 .

[0064] In this embodiment, the sealing material for the sealing connector 141 and the battery fixing member 143 is a ceramic glass sealing material.

[0065] Furthermore, in order to better position the self-sealing single cell 142 and avoid the self-sealing single cell 142 and the battery fixing component 143 from sliding and misaligning during the stack assembly process, the self-sealing single cell 142 and the battery fixing component 143 are fixed by snap-fit.

[0066] In this embodiment, in order to facilitate the extraction of gas, there are two battery holders 143 in each single battery assembly, one of which is installed at the gas outlet end of the self-sealing single battery 142.

[0067] Furthermore, the vent end of the self-sealing single cell 142 is also provided with a vent 1422, which is also a flat tubular structure extending out of the single cell body.

[0068] Please refer to Figure 1 , Figures 4-6 In this embodiment, the battery holder 143, connector 141, first collector plate 120, and first cover plate 111 each have three gas inlets, including two air inlets 1112 and one gas inlet 1111; the number of gas outlets is also three, including two air outlets and one gas outlet. Furthermore, the number, shape, size, and position of the gas inlets are identical across all structures, facilitating improved battery intake efficiency. Similarly, the number, shape, size, and position of the gas outlets are identical across all structures, facilitating improved battery exhaust efficiency.

[0069] In this embodiment, in order to obtain a suitable power generation, for example, the power generation of the battery stack is 1KW, the number of connectors 141 in the battery repeating unit 140 is 40.

[0070] Furthermore, the surface of the connector 141 adjacent to the cathode side of the self-sealing single cell 142 is provided with a gas channel and a support ridge. The gas channel is used to supply the flow of oxidizing gas, and the opposite side of the connector 141 is a plane.

[0071] In this embodiment, all components are made of the same alloy material. In order to better secure the fuel cell stack, the bolts and nuts of the fastening components are made of high-temperature resistant alloy with a relatively low coefficient of thermal expansion.

[0072] Furthermore, the second cover plate 112 has a countersunk hole area for positioning the second current collector 130 and the battery repeating unit 140.

[0073] Furthermore, insulating materials are provided between the second cover plate 112 and the second current collector 130, and between the first cover plate 111 and the first current collector 120. The insulating material can be any one of mica board, alumina coating and zirconium oxide coating. In this embodiment, it is specifically an alumina insulating coating.

[0074] Please refer to Figure 6 andFigure 7 In this embodiment, both the first current collector 120 and the second current collector 130 are provided with current collector ears 160 for connecting to external circuits.

[0075] This embodiment provides a self-sealing solid oxide fuel cell stack 100, the assembly process of which and its operating principle are as follows:

[0076] Assembly process:

[0077] Place the second cover plate 112 on a flat surface, first place / coat insulating material in the countersunk hole area, then place the second current collector 130 in the countersunk hole area, place a current collector mesh on the surface of the second current collector 130, place self-sealing single cells 142 (hereinafter referred to as battery layers) with battery fixing parts 143 already snapped on the left and right sides on the surface of the current collector mesh, the surface of the battery layer is the current collector mesh, then the connector 141, then place the current collector mesh, battery layer, current collector mesh connector 141 in sequence until the battery repeating unit 140 is assembled. The top layer of the assembled battery repeating unit 140 is the battery layer, then place the first current collector 120 on the surface of the top battery layer, place / coat insulating material on the surface of the first current collector 120, then place the first cover plate 111, bolts 113 pass through the first cover plate 111 and the second cover plate 112, then tighten with nuts 114 and position the battery repeating unit 140, thus completing the assembly.

[0078] Operating principle:

[0079] Taking one end of the first current collector 120 as the cathode and one end of the second current collector 130 as the anode as an example, the gas inlet 1111 on the first cover plate 111 is connected to an external gas pipeline, the air inlet 1112 is connected to an external air pipeline, and the gas outlet is also connected to the corresponding external pipeline. The current collector ears 160 on the first current collector 120 and the second current collector 130 are respectively connected to the external circuit. The fuel gas flows into the battery repeating unit 140 from the gas inlet of the first cover plate 111, where an electrochemical reaction occurs in the self-sealed single cell 142. The current is collected by the current collector network and then transferred to the adjacent single cell through the connector 141. Finally, the current of the battery repeating unit 140 is collected in the second current collector 130 and output to the external circuit through the current collector ears 160 on the second current collector 130 to power external electrical appliances. Then the current returns from the current collector ears 160 of the first current collector 120, forming the battery stack power supply circuit.

[0080] Example 2

[0081] This embodiment provides a solid oxide fuel cell stack, whose structure is basically similar to that of Embodiment 1, with the following differences:

[0082] Please refer to Figure 8 andFigure 9 In this embodiment, the fastening component is composed of a power-driven spring clamping member. The first cover plate 111 and the second cover plate 112 are driven to press together by a power device, such as a cylinder, thereby fixing the current collector and the battery repeating unit 140.

[0083] Furthermore, please refer to the following: Figure 10 In this embodiment, there is only one battery holder 143, which is installed at the air inlet of the self-sealing single battery 142 and the air outlet is open. The unreacted fuel gas and air are directly burned near the air outlet 1422.

[0084] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A self-sealing solid oxide fuel cell stack, characterized in that, It includes a fuel cell stack mounting assembly, a first current collector, a second current collector, and a battery repeating unit; The stack fixing assembly includes fastening components and a first cover plate and a second cover plate spaced apart. A first current collector, a battery repeating unit, and a second current collector are sequentially installed between the first cover plate and the second cover plate, and the first cover plate and the second cover plate are positioned by fastening components. The battery repeating unit includes at least two single-cell components and a connector disposed between two adjacent single-cell components; each single-cell component includes a self-sealing single cell, a battery fixing component, and a current collector. The self-sealing single cell includes an anode side, a cathode side, an air inlet end, and an air outlet end. The anode side and cathode side of the self-sealing single cell are spaced apart from the connector via the current collector end. The air inlet end of the self-sealing single cell is mounted on the battery fixing component and includes an air inlet. The wall surface adjacent to the air inlet end is sealed with a sealing material. The battery fixing component, the connector, the first current collector plate, and the first cover plate are all provided with gas inlets and gas outlets. The gas inlets are interconnected and communicate with the air inlet end of each self-sealing single cell, and the gas outlets are interconnected and communicate with the air outlet end of each self-sealing single cell. The self-sealing single cell is a self-sealing metal-supported single cell. The self-sealing single cell is prepared by any one of the following technologies: thermal spraying, additive manufacturing, or welding. It is a structure in which the single cell, consisting of an anode, an electrolyte, and a cathode, is integrated with a metal support having a fuel gas passage structure. The air inlet of the self-sealing single battery is a tubular structure extending separately from the battery body, and the air outlet of the self-sealing single battery is a flat tubular structure extending from the battery body.

2. The self-sealing solid oxide fuel cell stack according to claim 1, characterized in that, Each of the single-cell assemblies has two battery holders, and the vent end of the self-sealing single cell is also equipped with a corresponding battery holder.

3. The self-sealing solid oxide fuel cell stack according to claim 1, characterized in that, The number of gas inlets and gas outlets on the battery fixture, connector, first collector plate, and first cover plate are all at least two.

4. The self-sealing solid oxide fuel cell stack according to claim 1, characterized in that, The number of connectors in the battery repeating unit is 2 to 50.

5. The self-sealing solid oxide fuel cell stack according to claim 1, characterized in that, The surface of the connector adjacent to the cathode side of the self-sealing single cell is provided with a gas channel and a support ridge.

6. The self-sealing solid oxide fuel cell stack according to claim 1, characterized in that, The first cover plate, the second cover plate, the connector, the second current collector, the first current collector, and the battery fixing component are all made of the same alloy.

7. The self-sealing solid oxide fuel cell stack according to claim 6, characterized in that, The fastening component is made of an alloy with a low coefficient of thermal expansion.

8. The self-sealing solid oxide fuel cell stack according to claim 1, characterized in that, The second cover plate has a countersunk hole area for positioning the second current collector and the battery repeating unit; Insulating material is provided between the second cover plate and the second collector plate, and between the first cover plate and the first collector plate; The insulating material includes any one of mica board, alumina coating, and zirconium oxide coating.

9. The self-sealing solid oxide fuel cell stack according to claim 1, characterized in that, Both the first and second current collectors are provided with current collector ears for connecting to external circuits.

10. An application of a self-sealing solid oxide fuel cell stack as described in any one of claims 1 to 9 in the field of batteries.

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