A high pressure solid oxide fuel stack housing seal

Abstract

The utility model discloses a kind of high-pressure solid oxide fuel stack shell sealing structure, it is related to solid oxide fuel cell technical field, by stack bottom plate setting in stack bottom, shell is set in stack side, top outer side is provided with the upper groove for installing stack top plate, and in upper groove setting upper sealing structure, upper sealing cotton in upper sealing structure, first upper sealing block and second upper sealing block are sequentially set from top to bottom in upper groove, after upper sealing cotton is under pressure, by the first upper sealing block or second upper sealing block of contact surface inclination to the shell is transversely extruded and sealed, since the upper sealing structure in the shell of stack adopts wedge-shaped sealing ring, the higher stack working pressure is, the higher sealing effect is, can be applicable to 5-50bar working pressure, upper sealing structure and shell can be detachably connected, can be reused, reduce use cost.

Description

Technical Field

[0001] This utility model relates to the field of solid oxide fuel cell technology, and in particular to a high-voltage solid oxide fuel cell stack shell sealing structure. Background Technology

[0002] With the development of new energy technologies, there is an urgent need to develop solid oxide fuel cell technology, which has advantages such as high efficiency and long lifespan. The stack structure includes two types: internal flow cavity and external flow cavity. Internal flow cavity stacks only require placing the stack on the stack base plate to achieve sealing between the fuel and air sides. External flow cavity stacks, however, do not include an air collection section, requiring an additional air casing and stack top plate for air collection during use.

[0003] Currently, in order to facilitate mass production of fuel cell stacks and reduce their weight, fuel cell stacks typically use an external flow cavity structure. This requires additional sealing of the connection points between the air casing and the bottom plate of the fuel cell stack, as well as the connection points between the air casing and the top plate of the fuel cell stack. This results in a high leakage rate, which affects the performance and lifespan of the fuel cell stack.

[0004] With the development of solid oxide fuel cell technology, it is urgent to increase the stack operating pressure to 5-50 bar in order to improve stack performance. This places higher demands on the sealing between the air shell and the top and bottom plates of the stack. Existing simple clamping structures are difficult to meet the sealing requirements of high-pressure stacks. If the entire shell is directly welded, it will make the stack difficult to repair and increase the stack operation and maintenance costs. Therefore, it is necessary to develop sealing structures for high-pressure solid oxide fuel cell stacks. Utility Model Content

[0005] The purpose of this invention is to provide a sealing structure for the outer shell of a high-pressure solid oxide fuel cell stack, which improves the sealing performance of the structure, reduces the leakage rate, and improves the performance and lifespan of the stack.

[0006] To solve the above-mentioned technical problems, this utility model provides a high-pressure solid oxide fuel cell stack outer casing sealing structure, including:

[0007] The fuel cell stack top plate is located at the top of the fuel cell stack and has inlet and outlet channels for supplying fuel and air to the fuel cell stack.

[0008] The outer casing is disposed on the side of the fuel cell stack, and the top outer side is provided with an upper groove for mounting the top plate of the fuel cell stack;

[0009] A fuel cell stack base plate is disposed at the bottom of the fuel cell stack and is used to mount the fuel cell stack.

[0010] The upper sealing structure includes an upper sealing cotton, a first upper sealing block, and a second upper sealing block arranged sequentially from top to bottom in the upper groove. The first upper sealing block and the second upper sealing block are first wedge-shaped sealing blocks with adjacent inclined surfaces. After the upper sealing cotton is subjected to pressure, the outer shell is laterally squeezed and sealed by the first upper sealing block or the second upper sealing block.

[0011] The device also includes a lower groove on the upper surface of the fuel cell base plate for mounting the bottom of the housing, and a lower sealing structure disposed in the lower groove. The lower sealing structure includes a lower sealing cotton, a first lower sealing block and a second lower sealing block disposed sequentially from top to bottom in the lower groove. The first lower sealing block and the second lower sealing block are second wedge-shaped sealing blocks with adjacent inclined surfaces. When the lower sealing cotton is subjected to pressure, the housing is laterally squeezed and sealed by the first lower sealing block or the second lower sealing block.

[0012] The second lower sealing block contacts the first lower sealing block either facing the fuel cell stack or away from the fuel cell stack.

[0013] The inclined surfaces of the first upper sealing block, the second upper sealing block, the first lower sealing block, and the second lower sealing block are either planes or curved surfaces, and the inclined angles of the inclined surfaces of the first wedge-shaped sealing block and the second wedge-shaped sealing block are 30°-60°.

[0014] The first upper sealing block, the second upper sealing block, the first lower sealing block, and the second lower sealing block are nickel sealing blocks or ceramic sealing blocks.

[0015] The widths of the first upper sealing block, the second upper sealing block, the first lower sealing block, and the second lower sealing block are 4-8 mm.

[0016] The surface roughness of the upper sealing structure is 0.4-1.6.

[0017] The upper sealing cotton and the lower sealing cotton are aluminum silicate cotton or refractory fiber cotton.

[0018] The upper groove is located on the top outer side or top inner side of the outer casing.

[0019] The upper groove and the lower groove have the same shape and the same size.

[0020] The high-voltage solid oxide fuel cell stack casing sealing structure provided in this embodiment of the invention has the following advantages compared with the prior art:

[0021] The high-pressure solid oxide fuel cell stack outer shell sealing structure provided in this embodiment is set at the bottom of the stack via a stack base plate, with the outer shell located on the side of the stack. An upper groove for mounting the stack top plate is provided on the top outer side, and an upper sealing structure is set in the upper groove. Upper sealing cotton, a first upper sealing block, and a second upper sealing block are sequentially arranged from top to bottom in the upper groove. When the upper sealing cotton is under pressure, the first or second upper sealing block, with its inclined contact surface, laterally compresses and seals the outer shell. Because the upper sealing structure in the stack outer shell uses a wedge-shaped sealing ring, the higher the stack operating pressure, the better the sealing effect. It is suitable for operating pressures of 5-50 bar. The upper sealing structure is detachably connected to the outer shell, allowing for reuse and reducing operating costs. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 A schematic diagram of one embodiment of the high-voltage solid oxide fuel cell stack outer casing sealing structure provided by this utility model;

[0024] Figure 2 A schematic diagram of the lower sealing structure of an embodiment of the high-voltage solid oxide fuel cell stack outer casing sealing structure provided by this utility model;

[0025] Figure 3 A schematic diagram of the upper sealing structure of one embodiment of the high-voltage solid oxide fuel cell stack sealing structure provided by this utility model;

[0026] Among them, 10-base plate of fuel cell stack, 20-lower sealing structure, 30-fuel cell stack, 40-outer shell, 50-top plate of fuel cell stack, 60-upper sealing structure, 61-upper sealing cotton, 62-first upper sealing block, 63-second upper sealing block, 21-lower sealing cotton, 22-first lower sealing block, 23-second lower sealing block. Detailed Implementation

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0028] Please refer to Figures 1-3 , Figure 1 A schematic diagram of one embodiment of the high-voltage solid oxide fuel cell stack outer casing sealing structure provided by this utility model; Figure 2 A schematic diagram of the lower sealing structure of an embodiment of the high-voltage solid oxide fuel cell stack outer casing sealing structure provided by this utility model; Figure 3 This is a schematic diagram of the upper sealing structure of one embodiment of the high-pressure solid oxide fuel cell stack outer shell sealing structure provided by this utility model.

[0029] In one specific embodiment, the high-voltage solid oxide fuel cell stack outer casing sealing structure includes:

[0030] The fuel cell stack top plate 50 is disposed on top of the fuel cell stack 30 and is provided with inlet and outlet channels for providing fuel and air to the fuel cell stack 30;

[0031] The outer casing 40 is disposed on the side of the fuel cell stack 30, and the top outer side is provided with an upper groove for mounting the top plate 50 of the fuel cell stack;

[0032] A base plate 10 is disposed at the bottom of the fuel cell stack 30 for mounting the fuel cell stack 30;

[0033] The upper sealing structure 60 includes an upper sealing cotton 61, a first upper sealing block 62, and a second upper sealing block 63 arranged sequentially from top to bottom in the upper groove. The first upper sealing block 62 and the second upper sealing block 63 are first wedge-shaped sealing blocks with adjacent inclined surfaces. After the upper sealing cotton 61 is subjected to pressure, the outer shell 40 is laterally squeezed and sealed by the first upper sealing block 62 or the second upper sealing block 63.

[0034] The fuel cell stack base plate 10 is located at the bottom of the fuel cell stack 30, and the outer shell 40 is located on the side of the fuel cell stack 30. The top outer side is provided with an upper groove for installing the fuel cell stack top plate 50, and an upper sealing structure 60 is provided in the upper groove. The upper sealing cotton 61, the first upper sealing block 62 and the second upper sealing block 63 in the upper sealing structure 60 are arranged sequentially from top to bottom in the upper groove. When the upper sealing cotton 61 is under pressure, the first upper sealing block 62 or the second upper sealing block 63 with inclined contact surfaces will perform lateral compression sealing on the outer shell 40. Since the upper sealing structure 60 in the outer shell 40 of the fuel cell stack 30 adopts a wedge-shaped sealing ring, the higher the working pressure of the fuel cell stack 30, the higher the sealing effect. It is applicable to working pressures of 5-50 bar. The upper sealing structure 60 and the outer shell 40 are detachably connected and can be reused, reducing the cost of use.

[0035] To further improve the efficiency of the fuel cell stack casing 40, in one embodiment, the sealing structure of the high-pressure solid oxide fuel cell stack casing 40 further includes a lower groove for mounting the bottom of the casing 40 on the upper surface of the stack base plate 10, and a lower sealing structure 20 disposed in the lower groove. The lower sealing structure 20 includes a lower sealing cotton 21, a first lower sealing block 22, and a second lower sealing block 23 disposed sequentially from top to bottom in the lower groove. The first lower sealing block 22 and the second lower sealing block 23 are second wedge-shaped sealing blocks with adjacent inclined surfaces. When the lower sealing cotton 21 is subjected to pressure, the casing 40 is laterally squeezed and sealed by the first lower sealing block 22 or the second lower sealing block 23.

[0036] The housing 40 is mounted at the bottom by creating a groove on the upper surface of the fuel cell stack base plate 10. A lower sealing structure 20 is then installed in the groove. When the lower sealing cotton 21 is under pressure, the housing 40 is laterally compressed and sealed by either the first lower sealing block 22 or the second lower sealing block 23. This structure allows for good sealing even under high operating pressures of the fuel cell stack 30, while also enabling repeated disassembly and assembly of the housing 40. This improves the usability of the housing 40 and reduces maintenance costs during long-term operation of the fuel cell stack 30.

[0037] The sealing blocks in this application are all wedge-shaped sealing blocks. If the contact surface of an adjacent sealing block intersects with the top extension line of the fuel cell stack 30, it means that the top sealing block will move laterally directly to squeeze the outer casing 40. The bottom sealing block forms a support, restricting the movement direction of the top sealing block. It moves laterally by being subjected to a force that is inclined upward away from the fuel cell stack 30, thereby squeezing the outer casing 40.

[0038] Similarly, if the contact surface of an adjacent sealing block intersects with the bottom extension line of the fuel cell stack 30, the upper wedge-shaped sealing block can only move vertically downward due to the restriction of the lower wedge-shaped sealing block, while the lower sealing block, due to the force that is obliquely downward and away from the fuel cell stack 30, moves laterally, thereby squeezing the outer casing 40.

[0039] In this application, the choice of which of the two sealing blocks at the same location is used as the vertically moving component and which is used as the horizontally moving component can be determined by the user. However, since the top sealing block has a sealing cotton on top, if it moves horizontally, the contact area between the sealing block and the corresponding sealing cotton may become smaller, which may cause the sealing cotton to bend. This could result in a poor sealing effect or even damage to the sealing cotton. Therefore, the top sealing block is generally used as the vertically moving component.

[0040] Of course, a cuboid slider can also be set on the top of the sealing block so that the sealing cotton does not come into direct contact with the sealing block, but rather with the slider. The contact area between the slider and the sealing cotton remains constant, ensuring structural stability and sealing reliability. It also ensures stable force transmission to the sealing block below, improving the reliability and stability of use.

[0041] Therefore, the contact surface between the second lower sealing block 23 and the first lower sealing block 22 faces the fuel cell stack 30 or is away from the fuel cell stack 30.

[0042] The orientation of the inclined surface of the sealing block in this application can be set as needed, and the sliding range can also be set. For example, in the area where sliding is required, the roughness can be reduced by polishing or adding other types of functional film layers, thereby improving the flexibility and stability of use.

[0043] In this application, an inclined surface is provided on the sealing block to achieve lateral sliding compression, but its structure is not limited. The inclined surfaces of the first upper sealing block 62, the second upper sealing block 63, the first lower sealing block 22, and the second lower sealing block 23 are planes or curved surfaces, and the inclined angle of the inclined surfaces of the first wedge-shaped sealing block and the second wedge-shaped sealing block is 30°-60°.

[0044] Using a flat surface as the inclined surface results in smoother sliding, but the sliding trend remains constant, with no limitations on the range and degree of sliding. In contrast, using a curved surface as the inclined surface limits the sliding range; for example, sliding will stop after reaching the lowest point, preventing excessive compression of the outer shell 40 and improving reliability and safety. Furthermore, external sensors can be installed to monitor its movement, such as monitoring the pressure on the bottom and sides. This can be achieved by placing magnets inside the sealing block and external sensors to detect the magnets' positions, or by installing a support plate and pressure sensors on the outside of the outer shell to detect external pressure, thereby monitoring the state of the sealing block and ensuring reliable operation.

[0045] This application does not limit the material and size of the sealing block, but due to the environment in which it is used, it is required to have high temperature resistance, sufficient rigidity to ensure that it will not be damaged due to excessive pressure, and sufficient smoothness to ensure sufficient sealing performance and pressure sensing performance, so as to be able to sense weak pressure, rather than being able to quickly impact the outer shell 40 after slowly overcoming friction due to large friction, thus ensuring the safety and reliability of use. Generally, the first upper sealing block 62, the second upper sealing block 63, the first lower sealing block 22, and the second lower sealing block 23 are nickel sealing blocks or ceramic sealing blocks, or other high temperature resistant materials, which are not limited in this application.

[0046] The size of the sealing block is not limited in this application. It is generally set according to the size of the fuel cell stack 30 and the size of the corresponding groove. Generally, the width of the first upper sealing block 62, the second upper sealing block 63, the first lower sealing block 22, and the second lower sealing block 23 is 4-8mm.

[0047] This application does not limit the surface roughness of the sealing structure. Generally, since it needs to slide, it needs to be designed with a small roughness. Generally, the surface roughness of the upper sealing structure 60 is 0.4-1.6.

[0048] This application does not limit the material of the sealing cotton, but it needs to have high temperature resistance. Generally, the upper sealing cotton 61 and the lower sealing cotton 21 are aluminum silicate cotton or fire-resistant fiber cotton.

[0049] This application does not limit the position, size, or formation method of the upper and lower grooves. The upper groove is located on the top outer side or top inner side of the outer shell 40.

[0050] The upper groove can be integrally formed during the design of the outer shell 40, or it can be obtained in the existing outer shell 40 through processes such as welding, or by other processes.

[0051] Preferably, the upper groove and the lower groove have the same shape and the same size.

[0052] By using upper and lower grooves of the same size and shape, the same structure can be used in the selection of sealing blocks, thereby achieving modular design, realizing the versatility of different sealing blocks and sealing cotton, reducing usage costs, and improving usage flexibility.

[0053] In one embodiment, the sealing structure of the high-pressure solid oxide fuel cell stack casing 40 includes a stack top plate 50, an upper sealing cotton 61, a first upper sealing block 62, a second upper sealing block 63, a stack 30, a casing 40, a lower sealing cotton 21, a first lower sealing block 22, a second lower sealing block 23, and a stack bottom plate 10.

[0054] The fuel cell stack base plate 10 serves as an airflow distribution plate, providing fuel and air intake and exhaust for the fuel cell stack 30. The fuel cell stack 30 is placed on the base plate 10, and the fuel cell stack top plate 50 presses down on the fuel cell stack 30 to pressurize it. The outer casing 40 collects airflow from the fuel cell stack 30. A lower sealing structure 20, consisting of lower sealing cotton 21, a first lower sealing block 22, and first and second lower sealing blocks, seals the outer casing 40 with the fuel cell stack base plate 10. An upper sealing structure 60, consisting of upper sealing cotton 61, a first upper sealing block 62, and a second upper sealing block 63, seals the outer casing 40 with the fuel cell stack top plate 50.

[0055] During use, first install the fuel cell stack base plate 10, then place the fuel cell stack 30 on the base plate 10, and then place the outer casing 40. Next, place the first lower sealing block 22, the second lower sealing block 23, and the lower sealing cotton 21 from bottom to top to complete the lower sealing structure 20. Then, place the second upper sealing block 63, the first upper sealing block 62, and the upper sealing cotton 61 from bottom to top on the outer side of the top of the outer casing 40. Finally, fasten the fuel cell stack top plate 50 and insert it into the gap between the upper sealing blocks and the outer casing 40 of the fuel cell stack 30 to complete the upper sealing structure 60 of the fuel cell stack 30.

[0056] The top plate 50, outer shell 40, and bottom plate 10 of the fuel cell stack are made of high-temperature resistant ferritic stainless steel, with a surface roughness of 0.8 in the sealing structure area. The first lower sealing block 22, the second lower sealing block 23, the first upper sealing block 62, and the second upper sealing block 63 are all made of pure nickel, with a surface roughness of 0.8. The upper sealing cotton 61 and the lower sealing cotton 21 are made of high-temperature resistant aluminum silicate cotton. The sealing principle of the upper sealing structure 60 and the lower sealing structure 20 is that the internal high-pressure gas flows through the sealing structure, and the sealing cotton acts as a gas barrier to prevent leakage of the fuel cell stack 30, serving as the first seal. At the same time, driven by the high-pressure gas, the sealing cotton moves downward, squeezing the first and second sealing blocks. Since the sealing blocks have a wedge-shaped structure, they will slide inward and outward respectively when squeezed from the top, thereby squeezing the outer shell 40 and the top plate 50 or the bottom plate 10 of the fuel cell stack. Because the sealing blocks are made of pure nickel, the material has high strength and high temperature resistance, making it more prone to deformation. The smooth surface of the contact surface prevents gas leakage, achieving the second seal. The higher the working pressure of the fuel cell stack 30, the greater the deformation of the wedge structure, and the greater the clamping force at the sealing position, thus improving the sealing effect.

[0057] When it is necessary to replace the internal fuel cell stack 30, simply remove the fuel cell stack 30 housing 40 and the sealing structure in the reverse order of assembly to replace the internal fuel cell stack 30.

[0058] This application specifies a surface roughness requirement for the sealing structure area, aiming to make the surface smoother to facilitate a sealing effect.

[0059] The first and second sealing blocks employ an opposite wedge-shaped structure, which, under pressure, can squeeze the inner and outer walls from both sides, achieving a better seal with higher pressure and greater extrusion force. The material is pure nickel, which is heat-resistant and relatively soft at high temperatures, facilitating sealing. The dimensions are determined by the groove width, typically around 4-8 mm.

[0060] In this application, the top plate 50 of the fuel cell stack is inserted into the gap between the first upper sealing block 62 and the outer shell 40, that is, it is inserted against the outside of the groove. The upper sealing area is inside the outer shell 40. Similarly, the bottom of the outer shell 40 is also inserted between the first upper sealing block 62 and the bottom plate 10 of the fuel cell stack, and the upper sealing area is inside the outer shell 40.

[0061] In this application, the sealing cotton is used as an air barrier to prevent leakage of the fuel cell stack 30. The sealing block, which has been softened by high pressure and high temperature, is sealed at the corresponding position through friction.

[0062] In this application, the sealing structure of the outer shell 40 of the fuel cell stack 30 adopts a wedge-shaped sealing ring. The higher the working pressure of the fuel cell stack 30, the higher the sealing effect. It is applicable to working pressures of 5-50 bar. The outer shell 40 of the fuel cell stack 30 adopts a detachable structure, that is, the outer shell 40 and the sealing structure can be reused.

[0063] This application employs a wedge-shaped sealing ring as the core sealing structure, which achieves good sealing performance even under high operating pressures of the fuel cell stack 30. It also allows for repeated disassembly and reassembly of the fuel cell stack 30 housing 40, improving its usability and reducing maintenance costs during long-term operation. The wedge-shaped sealing block inside the sealing structure is made of pure nickel, providing high-temperature oxidation resistance. Its lower strength also ensures a tighter seal under pressure, achieving excellent sealing performance.

[0064] In summary, the high-pressure solid oxide fuel cell stack outer shell sealing structure provided by this utility model embodiment is set at the bottom of the stack via a stack base plate, with the outer shell located on the side of the stack. An upper groove for installing the stack top plate is provided on the top outer side, and an upper sealing structure is provided in the upper groove. The upper sealing cotton, the first upper sealing block, and the second upper sealing block in the upper sealing structure are sequentially arranged from top to bottom in the upper groove. When the upper sealing cotton is under pressure, the first or second upper sealing block with its inclined contact surface performs a lateral compression seal on the outer shell. Because the upper sealing structure in the stack outer shell uses a wedge-shaped sealing ring, the higher the stack working pressure, the better the sealing effect. It is suitable for working pressures of 5-50 bar. The upper sealing structure is detachably connected to the outer shell, allowing for reuse and reducing operating costs.

[0065] The above provides a detailed description of the high-voltage solid oxide fuel cell stack casing sealing structure provided by this utility model. Specific examples have been used to illustrate the principle and implementation of this utility model. The descriptions of the embodiments above are merely for the purpose of helping to understand the method and core idea of ​​this utility model. It should be noted that those skilled in the art can make various improvements and modifications to this utility model without departing from its principles, and these improvements and modifications also fall within the protection scope of the claims of this utility model.

Claims

1. A sealing structure for the outer casing of a high-voltage solid oxide fuel cell stack, characterized in that, include; The fuel cell stack top plate is located at the top of the fuel cell stack and has inlet and outlet channels for supplying fuel and air to the fuel cell stack. The outer casing is disposed on the side of the fuel cell stack, and the top outer side is provided with an upper groove for mounting the top plate of the fuel cell stack; A fuel cell stack base plate is disposed at the bottom of the fuel cell stack and is used to mount the fuel cell stack. The upper sealing structure includes an upper sealing cotton, a first upper sealing block, and a second upper sealing block arranged sequentially from top to bottom in the upper groove. The first upper sealing block and the second upper sealing block are first wedge-shaped sealing blocks with adjacent inclined surfaces. After the upper sealing cotton is subjected to pressure, the outer shell is laterally squeezed and sealed by the first upper sealing block or the second upper sealing block.

2. The high-voltage solid oxide fuel cell stack outer casing sealing structure as described in claim 1, characterized in that, It also includes a lower groove provided on the upper surface of the fuel cell base plate for mounting the bottom of the housing, and a lower sealing structure provided in the lower groove. The lower sealing structure includes a lower sealing cotton, a first lower sealing block and a second lower sealing block arranged sequentially from top to bottom in the lower groove. The first lower sealing block and the second lower sealing block are second wedge-shaped sealing blocks with adjacent inclined surfaces. When the lower sealing cotton is subjected to pressure, the housing is laterally squeezed and sealed by the first lower sealing block or the second lower sealing block.

3. The high-voltage solid oxide fuel cell stack outer casing sealing structure as described in claim 2, characterized in that, The second lower sealing block contacts the first lower sealing block with the surface facing the fuel cell stack or away from the fuel cell stack.

4. The high-voltage solid oxide fuel cell stack outer casing sealing structure as described in claim 3, characterized in that, The inclined surfaces of the first upper sealing block, the second upper sealing block, the first lower sealing block, and the second lower sealing block are either planes or curved surfaces, and the inclined angles of the inclined surfaces of the first wedge-shaped sealing block and the second wedge-shaped sealing block are 30°-60°.

5. The high-voltage solid oxide fuel cell stack outer casing sealing structure as described in claim 4, characterized in that, The first upper sealing block, the second upper sealing block, the first lower sealing block, and the second lower sealing block are nickel sealing blocks or ceramic sealing blocks.

6. The high-voltage solid oxide fuel cell stack outer casing sealing structure as described in claim 5, characterized in that, The widths of the first upper sealing block, the second upper sealing block, the first lower sealing block, and the second lower sealing block are 4-8 mm.

7. The high-voltage solid oxide fuel cell stack casing sealing structure as described in claim 6, characterized in that, The surface roughness of the upper sealing structure is 0.4-1.

6.

8. The high-voltage solid oxide fuel cell stack casing sealing structure as described in any one of claims 2-7, characterized in that, The upper sealing cotton and the lower sealing cotton are aluminum silicate cotton or refractory fiber cotton.

9. The high-voltage solid oxide fuel cell stack outer casing sealing structure as described in claim 8, characterized in that, The upper groove is located on the top outer side or top inner side of the housing.

10. The high-voltage solid oxide fuel cell stack casing sealing structure as described in claim 9, characterized in that, The upper groove and the lower groove have the same shape and the same size.

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