Self-pressurization device for solid oxide stack

Abstract

The utility model relates to a self-pressurization device for a solid oxide galvanic pile, which comprises a base, a galvanic pile, a pressing plate, a ball, a pressing block and a positioning column, one end of the positioning column is connected with the base, the other end of the positioning column is connected with the pressing block, the galvanic pile and the pressing plate are arranged between the base and the pressing block, and the ball is arranged on the pressing block. The pressing plate is arranged above the electric pile, and the ball is arranged between the pressing block and the pressing plate. The core of the device is that a specially designed base and a specially designed pressing plate are matched with a pressing block, a sleeve and other components to provide constant fastening pressure for a galvanic pile in a full life cycle. The device is compact in structure and convenient to mount and dismount, can be directly used in complex environments such as storage, transportation and high-temperature operation without any operation after being mounted, and has high practical value.

Description

TECHNICAL FIELD

[0001] The utility model relates to solid oxide electric pile technical field especially is related to a kind of self-pressurizing device for solid oxide electric pile. BACKGROUND

[0002] Solid oxide electric pile includes solid oxide fuel cell stack and solid oxide electrolytic cell stack, and is a kind of efficient full solid-state electrochemical device of electrical energy and chemical energy mutual conversion.It is usually by plate type single cell, metal connecting plate, sheet sealing element, sheet current collector and other components in the vertical, same vertical center spatial orientation, with preset interaction force, superimposed composite structure formed, generally work in 600~800 ℃ high temperature condition, internally designed with the mutually independent channel of reducing gas and oxidizing gas flow.

[0003] 1) electric pile as the composite structure of a large number of components superimposed, outer component is easy to be inclined or deflected due to horizontal force, inner component is easy to be displaced due to vibration, causing sealing failure or poor electrical contact between electric pile interface, the consequence of this electric pile deviating from ideal structure is the performance attenuation of electric pile under high temperature working condition.Similarly, under high temperature working condition, the above-mentioned horizontal force, vibration and other adverse factors also need to be avoided.2) on the other hand, applying vertical force to electric pile is beneficial to the close combination between components, thereby improving air tightness and overcoming horizontal force, and reducing contact resistance between components, ultimately improving electric pile performance.Further, controlling vertical force to be always at preset size can avoid damage to electric pile due to impact of changing mechanical force, and can ensure that electric pile works stably under preset ideal pressure.3) electric pile usually exists switching process of different pressurizing devices in the case of storage, transportation and work due to change of place or peripheral auxiliary device, and there is the risk of electric pile being impacted by changing pressurizing force during the process.On the other hand, electric pile, which is composed of a plurality of components superimposed, will produce certain plastic deformation due to long-term maintained fastening pressure.Finally, during the change process from normal temperature to high temperature, components of electric pile will expand to different degrees due to heat, and such high temperature and device deformation also put higher requirements on material selection and functional design of pressurizing device.Therefore, the device capable of meeting the pressurizing requirement of electric pile under normal temperature storage, transportation and high temperature working condition to avoid generating horizontal thrust and vertical impact, and simultaneously having pressure constant adjusting function has important significance.

[0004] In the prior art, the current electric pile pressurizing mode is divided into self-pressurizing and external pressurizing, wherein external pressurizing usually adopts screw rod or air cylinder as pressurizing part, and a connecting rod is used to connect force point of electric pile at high temperature with pressurizing part at low temperature under working condition, the overall size of device is large, and high installation space and transportation requirement exist, and there are problems of heat conduction and sealing difficulty of components connected between high temperature and low temperature, which reduces system efficiency.

[0005] The self-pressurization mode is more compact and does not have the above-mentioned defects. As disclosed in the patent application with the publication number CN116565279A, a self-pressurization shell for a solid oxide fuel cell is disclosed, which often places the stack between the upper and lower plates, and uses one or more sets of bolts to fasten the upper and lower plates, so that the fastening force is transmitted to the stack, and a closed side plate is combined to form a sealed cavity. The fastening force of the stack is adjusted by the pressing force of the fastening bolt pair on the upper and lower plates, that is, the pressing force is comparable to the fastening force. The pressure of the upper and lower plates is adjusted by adjusting the torque of the fastening nut. The structure is compact, but the fastening mode simply selects the fastening piece used at room temperature. On the one hand, there is no adjustment mode for plastic deformation of the stack at room temperature, and on the other hand, the problems of softening of important structural parts such as the fastening piece, the upper and lower plates, and the stack at high temperature, the inconsistency of the thermal expansion coefficient, and the high-temperature creep are ignored. The structure of rigid connection lacks adjustment ability, and it is difficult to apply stable pressing force to the stack in actual application process, which increases the risk of stack leakage or performance degradation. In addition, metal and metal are easy to adhere to each other in a long-term high-temperature environment, and the above-mentioned device has the defect of being difficult to disassemble after high-temperature operation. Practical new type content

[0006] In view of the deficiencies of the prior art, the purpose of the present application is to provide a self-pressurization device for a solid oxide stack, which is characterized by a specially designed base and a pressing plate, which are matched with a pressing block, a sleeve and other components to provide a constant fastening pressure to the stack throughout its life cycle. The device has a compact structure, is convenient to install and disassemble, and can be directly used for storage, transportation, high-temperature operation and other complex environments without any operation after installation, and has high practical value.

[0007] The above-mentioned utility model of the present application is realized by the following technical solutions:

[0008] A self-pressurization device for a solid oxide stack, comprising a base, a stack, a pressing plate, a ball, a pressing block and a positioning column, one end of the positioning column is connected with the base, the other end is connected with the pressing block, the stack and the pressing plate are arranged between the base and the pressing block, the pressing plate is arranged above the stack, and the ball is arranged between the pressing block and the pressing plate.

[0009] As a further technical solution of the present application, the positioning column is configured as two, the two positioning columns are symmetrically distributed on both sides of the stack, and the two ends of the positioning column are perpendicular to the top surface of the base and the bottom surface of the pressing block.

[0010] As a further technical scheme of the utility model: one end of the positioning column connecting the briquetting piece is provided with a sleeve, an external thread is formed on the outer wall of the sleeve close to the positioning column, and a nut is threadedly connected to the positioning column;

[0011] Both sides of the pressing plate are connected with elastic sheets, mounting holes are formed in the elastic sheets, and one end of the elastic sheet is sleeved with the positioning column at the position where the external thread is formed.

[0012] As a further technical scheme of the utility model: the nut on each positioning column is configured as two, and the two nuts are respectively located at both sides of the elastic sheet.

[0013] As a further technical scheme of the utility model: the inner diameter of the sleeve is greater than the outer diameter of the positioning column and smaller than the outer diameter of the external thread.

[0014] As a further technical scheme of the utility model: a sealing element is arranged between the base and the electric pile, and the outer dimension of the sealing element is the same as the bottom surface dimension of the electric pile.

[0015] As a further technical scheme of the utility model: an insulating plate is arranged between the pressing plate and the electric pile, and the outer dimension of the insulating plate is the same as the top surface dimension of the electric pile.

[0016] As a further technical scheme of the utility model: four circular grooves are formed in the top surface of the pressing plate, the ball is placed in each circular groove, the ball is in contact with the bottom of the briquetting piece, and the ball transmits the fastening force between the briquetting piece and the pressing plate.

[0017] As a further technical scheme of the utility model: four air tubes are connected to the side surface of the base, and four air holes are formed in the bottom of the electric pile and connected with the four air tubes respectively.

[0018] As a further technical scheme of the utility model: the center height of the external thread is the same as the sum of the heights of the sealing element, the electric pile and the insulating plate after being pressed.

[0019] In summary, the utility model has at least one of the following beneficial technical effects:

[0020] 1.The utility model discloses a self -pressurization device for solid oxide electric pile, and the device can be placed in the storage environment for a long time after installation, in the transportation environment, the electric pile is always subjected to constant fastening force, and under the dynamic adjustment of the pressing block, the pressing plate and the ball, even if the displacement or vibration of the pressing block relative to the base, the horizontal force will not be transmitted to the electric pile through the ball, in the high temperature working state, thanks to the design of the pressing plate and the pressing block, the matching gap of the sleeve and the positioning column, the relative spatial position of the combined pressure device can be adjusted at any time according to the thickness change of the electric pile, the insulating plate and the sealing element, the electric pile is still subjected to constant fastening force under low temperature to high temperature and long-term high temperature, even if there is thermal expansion coefficient and high temperature creep phenomenon.

[0021] 2.The utility model discloses the base and pressing plate of special design, collocation pressing block, sleeve and other components provide constant fastening pressure to electric pile in the whole life cycle.The device structure is compact, and the installation and dismounting are relatively convenient, and after installation, it can be directly used in the complex environment such as storage, transportation and high temperature operation without any operation, and has higher practical value.

[0022] 3.The utility model discloses the special design of pressure device cleverly separates the vertical force and horizontal force, can provide constant vertical fastening force, and insulate the horizontal force that electric pile receives, therefore effectively avoid the displacement of the component of electric pile in the transportation process due to external vibration or inertia factor. DRAWINGS

[0023] Figure 1 It is the whole structure schematic diagram of the utility model.

[0024] Figure 2 It is Figure 1 The local amplification schematic diagram of A part in.

[0025] Figure 3 It is the plan view of the utility model display pressing plate.

[0026] Figure legend: 1, pressing block;2, pressing plate;21, elastic sheet;22, circular groove;3, ball;4, electric pile;5, base;51, positioning column;52, external thread;53, air pipe;6, sleeve;7, nut;8, insulating plate;9, sealing element. CONCRETE IMPLEMENTATION

[0027] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application;Obviously, the described embodiments are only part of the embodiments of the present application, and not all the embodiments;Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor belong to the scope of protection of the present application.

[0028] In the description of the present application, it should be noted that the terms "upper", "lower", "inner", "outer", "top / bottom end" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0029] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "provided with", "sleeved / connected", "connected" and the like should be broadly understood, for example, "connected" can be fixedly connected, can be detachably connected, or integrally connected; can be mechanically connected, can be electrically connected; can be directly connected, can be indirectly connected through an intermediate medium, and can be internal communication of two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances. Embodiments

[0030] Referring to Figure 1 The utility model discloses a self -pressurization device for solid oxide electric pile, including base 5, electric pile 4, pressing plate 2, ball 3, pressing block 1 and positioning column 51, one end of positioning column 51 is connected with base 5, the other end is connected with pressing block 1, and electric pile 4 is arranged between base 5 and pressing block 1 with pressing plate 2, and pressing plate 2 is arranged above electric pile 4, and ball 3 is arranged between pressing block 1 and pressing plate 2.

[0031] In the embodiment, the positioning column 51 is configured as two, and the two positioning columns 51 are symmetrically distributed on the two sides of the electric pile 4, and the two ends of the positioning column 51 are perpendicular to the top surface of the base 5 and the bottom surface of the pressing block 1, respectively.

[0032] Referring to Figure 2 One end of the positioning column 51 connected with the pressing block 1 is provided with a sleeve 6, an external thread 52 is formed on the outer wall of the positioning column 51 close to the sleeve 6, and a nut 7 is threadedly connected to the positioning column 51; the two sides of the pressing plate 2 are respectively connected with elastic sheets 21, the elastic sheets 21 are provided with mounting holes, and one end of the elastic sheet 21 is sleeved on the position of the positioning column 51 where the external thread 52 is formed through the mounting hole. The center height of the external thread 52 is the same as the sum of the heights of the sealing element 9, the electric pile 4 and the insulating plate 8 after being pressed.

[0033] Referring to Figure 2The two nuts 7 on each positioning column 51 are arranged on both sides of the elastic sheet 21. The inner diameter of the sleeve 6 is larger than the outer diameter of the positioning column 51 and smaller than the outer diameter of the external thread 52. The seal 9 is arranged between the base 5 and the stack 4, and the outer dimension of the seal 9 is the same as the bottom surface dimension of the stack 4. The insulating plate 8 is arranged between the pressing plate 2 and the stack 4, and the outer dimension of the insulating plate 8 is the same as the top surface dimension of the stack 4.

[0034] With reference to Figure 3 The top surface of the pressing plate 2 is provided with four circular grooves 22, and each circular groove 22 is arranged to place a ball 3, the ball 3 is in contact with the bottom of the pressing block 1, and the ball 3 transmits the fastening force between the pressing block 1 and the pressing plate 2. The side surface of the base 5 is connected with four air pipes 53, and the bottom of the stack 4 is provided with four air holes connected with the four air pipes 53 respectively.

[0035] The device is composed of multiple components, from the bottom to the top, which are the specially designed base 5, the seal 9, the stack 4, the pressing plate 2, the ball 3, the pressing block 1, and additionally equipped with the sleeve 6 and the nut 7. Each component is made of multiple materials and is connected in a relatively fixed spatial relationship. The base 5 is made of high-temperature-resistant alloy, and the upper and lower surfaces have high parallelism to ensure that each component placed on the base 5 is placed horizontally.

[0036] The upper surface of the base 5 close to the stack 4 has a high level of flatness and smoothness, and the left and right positions are symmetrically designed with two positioning columns 51. The positioning column 51 is installed vertically, and part of the area is processed with an external thread 52. The side surface is connected with four air pipes 53 by welding. According to the current structure of the stack 4, four air holes are opened at the bottom of the stack 4 for the inlet and outlet of two kinds of gas. The upper surface of the base 5 has four openings which are distributed the same as the four air holes at the bottom of the stack 4. Further, the communication between the openings and the air pipes 53 is one-to-one and independent of each other. Further, the internal communication of the base 5 can be specially designed to make the inlet and outlet gas have a more optimal distribution effect.

[0037] The seal 9 is placed between the base 5 and the stack 4, and the material of the seal 9 can be selected from high-temperature glass or mica sheet, and the outer dimension of the seal 9 is the same as the bottom of the stack 4. The internal area of the seal 9 is opened, and the opening position is the same as the stack 4, and after installation, the gas entering and exiting from the air pipe 53 can enter the stack 4 from the bottom opening of the stack 4 through the opening of the seal 9. Further, in the case of determining the opening position and size of the internal area of the seal 9, the outer dimension of the seal 9 can be reduced, and after reducing the size, the stress area of the seal 9 is reduced, and under the same pressure condition, the pressure can be increased, which is beneficial to reduce the gas leakage rate between the seal 9 and the base 5, and between the seal 9 and the stack 4.

[0038] The insulation plate 8 is placed on the upper surface of the stack 4, and is usually made of high-temperature-resistant insulation materials such as alumina and mica. The outer size is the same as the upper surface of the stack 4, and the upper and lower surfaces of the insulation plate 8 need to have high flatness and parallelism.

[0039] The pressing plate 2 is made of high-temperature-resistant alloy and has a left-right symmetrical structure. The circular spacing of the two sides is the same as that of the positioning column 51, and the hole size is greater than the outer diameter of the external thread 52. The thickness is composed of two parts, the center region size is the same as the upper surface of the stack 4, and the thickness is relatively thick. The upper surface is processed with four circular grooves 22, and the rolling balls 3 are placed in the circular grooves 22. The rolling balls 3 transmit the fastening force between the pressing block 1 and the pressing plate 2. The relatively thick size of the center of the pressing plate 2 ensures that the pressure is not easy to deform at high temperature. The four circular grooves 22 on the upper surface of the pressing plate 2 function to limit the displacement of the rolling balls 3, so that the rolling balls 3 are always in the position close to the center of the pressing plate 2. The two sides of the pressing plate 2 are connected with elastic sheets 21, the elastic sheets 21 are punched, the elastic sheets 21 are thin in the vertical direction and are easy to elastically deform under stress, and have a relatively wide thickness in the horizontal direction and are not easy to deform.

[0040] The center height of the external thread 52 should be the same as the sum of the heights of the sealing element 9, the stack 4, and the insulation plate 8 after being pressed, and the total height of the external thread 52 in the vertical direction should be greater than the sum of the thickness of the thinner part of the pressing plate 2 and the two nuts 7.

[0041] The nut 7 is made of high-temperature-resistant alloy and has an internal thread processed inside to match the external thread 52. The large diameter of the external thread 52 needs to be greater than the diameter of the positioning column 51 to ensure that the nut 7 can be installed with the external thread 52 in the middle of the positioning column 51. The sleeve 6 is made of ceramic or mica, and has a through hole inside with an inner diameter greater than the positioning column 51 and less than the outer diameter of the external thread 52. The sleeve 6 is easy to install on the positioning column 51 and is placed above the external thread 52 in a fixed position.

[0042] The pressing block 1 is made of high-temperature-resistant alloy and has a left-right symmetrical through hole. The hole spacing is the same as that of the positioning column 51, and the hole size is greater than the outer diameter of the sleeve 6. The pressing block 1 is easy to install above the entire pressing device, and the lower surface is in contact with the rolling balls 3 and is matched with the positioning column 51 on which the sleeve 6 is installed through the through holes on both sides.

[0043] The fastening force borne by the stack 4 in the above device is equivalent to the gravity of the pressing block 1, and when the gravity is constant, the fastening force is constant. The gravity is mainly determined by the volume and density of the pressing block 1 and is easy to be accurately measured by a gravimeter. According to the required force size, the thickness of the pressing block 1 can be adjusted to adjust the volume and then control the fastening force borne by the stack 4.

[0044] The above-mentioned device, the electric pile 4 is located in the central area, by the fastening force is controlled by the gravity of the pressing block 1, can keep constant. The pressing block 1, positioning column 51, sleeve 6 of the device adopts interference fit, installation and removal is convenient. And the sleeve 6 and the pressing block 1, positioning column 51, due to the gap and the selection of different materials, it is not easy to stick, so that the upper part of the pressure structure is in the state of sliding adjustable. The insulating plate 8 is fixed on the positioning column 51 by four nuts 7, the deformation is easy to produce in the vertical direction, it is not easy to produce in the horizontal direction, when the pressing block 1 is shaken or inertial horizontal displacement occurs, the ball 3 rolls in the horizontal direction. Because the pressing plate 2 is relatively fixed with the positioning column 51, the ball 3 and the electric pile 4 below the pressing plate 2 always bear the vertical direction of the fastening force, and do not bear the horizontal force. On the other hand, when the electric pile 4 is extruded by constant force, plastic deformation occurs, the pressing plate 2 produces elastic deformation in the vertical direction, the center area of the pressing plate 2 adjusts downward, ensures that the electric pile 4 receives constant force. Similarly, when the height of the ball 3, the electric pile 4 and the sealing element 9 increases or decreases in the process of changing from low temperature to high temperature, such as thermal expansion or high temperature creep, the center area of the pressing plate 2 can be adjusted at any time to ensure that the electric pile 4 receives constant fastening force.

[0045] Preferably, the fastening mode of the nut 7 and the pressing plate 2 on the outer thread 52 can adopt double nut 7 fastening, which can reduce the fastening force of the nut 7 affected by the vibration. Further, before the nut 7 is fastened with the outer thread 52, boron nitride or ceramic powder can be coated on the surface of the outer thread 52 to prevent the nut 7 and the outer thread 52 from being bonded at high temperature and high pressure, which facilitates the disassembly of the device.

[0046] The device contains each component installation and removal simple, compact structure, can guarantee the electric pile 4 receives constant fastening pressure in the storage, transportation, work and other conditions, at the same time, the special design of the pressure structure avoids the electric pile 4 receiving horizontal force, guarantees the electric pile 4 structure integrity and reliability.

[0047] The implementation method is as follows: the base 5 is placed on a horizontal surface; the sealing element 9 is placed on the upper surface of the base 5, so that the opening of the sealing element 9 is aligned with the base 5; the two nuts 7 are screwed into the outer threads 52 respectively, until the lower edge of the outer threads 52; the stack 4, the insulating plate 8, and the pressing plate 2 are sequentially stacked on the sealing element 9, so that the above components are in the same vertical center; the ball 3 is placed in the center of the groove of the pressing plate 2; the two nuts 7 are screwed into the outer threads 52 respectively, until the upper edge of the outer threads 52; the two sleeves 6 are respectively sleeved on the positioning columns 51, since the inner diameter of the sleeve 6 is smaller than the outer diameter of the outer thread 52, the sleeve 6 can be stably placed on the outer thread 52; the pressing block 1 is installed, so that the through holes on both sides of the pressing block 1 are inserted into the sleeves 6, at this time, the fastening force borne by the stack 4 is equivalent to the weight of the pressing block 1, and the insulating plate 8, the stack 4, and the sealing element 9 are under a preset pressure and are deformed to a certain extent; the relative positions of the thin plates on both sides of the pressing plate 2 and the outer threads 52 are ensured to be unchanged, and the two pairs of nuts 7 on the upper and lower sides of the pressing plate 2 are tightened, at this time, the relative position of the pressing plate 2 relative to the outer threads 52 is unchanged, and obviously, the relative position of the pressing plate 2 relative to the base 5 is unchanged. The special shape of the pressing plate 2 enables the pressing plate 2 to elastically deform in the vertical direction when a smaller vertical force is applied, but it is difficult to deform or displace relative to the base 5 when a larger horizontal force is applied.

[0048] The implementation principle of the utility model is as follows: the utility model discloses a kind of self-pressurization device for solid oxide stack, after installation is completed, device can be placed in storage environment for a long time;In transport environment, stack 4 is always borne constant fastening force, and under the dynamic adjustment of pressing block 1, pressing plate 2 and ball 3, even if pressing block 1 occurs displacement or vibration relative to base 5, also cannot pass ball 3 to stack 4 transmission horizontal force;In high-temperature working state, benefit from the design of pressing plate 2 and the cooperation gap of pressing block 1, sleeve 6, positioning column 51, pressurization device can adjust the relative spatial position of combination at any time according to the thickness change of stack 4, insulating plate 8, sealing element 9, ensure that even if there is thermal expansion coefficient and high-temperature creep phenomenon under low temperature to high temperature and long-term high temperature, stack 4 is still borne constant fastening force.

[0049] The embodiments of the specific embodiment are preferred embodiments of the utility model, and do not limit the protection scope of the utility model, so that: equivalent changes made according to the structure, shape and principle of the utility model should be covered in the protection scope of the utility model.

Claims

1. A self-pressurizing device for a solid oxide stack, characterized by, It comprises a base (5), a stack (4), a pressing plate (2), a ball (3), a pressing block (1) and a positioning column (51), one end of the positioning column (51) is connected with the base (5), the other end is connected with the pressing block (1), the stack (4) and the pressing plate (2) are arranged between the base (5) and the pressing block (1), the pressing plate (2) is arranged above the stack (4), and the ball (3) is arranged between the pressing block (1) and the pressing plate (2).

2. A self-pressurizing device for a solid oxide stack according to claim 1, characterized in that The positioning column (51) is configured as two, two positioning columns (51) are symmetrically distributed on both sides of the stack (4), and the two ends of the positioning column (51) are perpendicular to the top surface of the base (5) and the bottom surface of the pressing block (1).

3. A self-pressurizing device for a solid oxide stack according to claim 2, characterized in that One end of the positioning column (51) connected with the pressing block (1) is provided with a sleeve (6), an external thread (52) is formed on the outer wall of the sleeve (6), and a nut (7) is threadedly connected on the positioning column (51). Both sides of the pressing plate (2) are connected with elastic sheets (21), the elastic sheets (21) are provided with mounting holes, and one end of the elastic sheet (21) is sleeved with the positioning column (51) at the position provided with the external thread (52) through the mounting hole.

4. A self-pressurizing device for a solid oxide stack according to claim 3, characterized in that The nut (7) on each positioning column (51) is configured as two, and the two nuts (7) are located on both sides of the elastic sheet (21).

5. A self-pressurizing device for a solid oxide stack according to claim 3, characterized in that The inner diameter of the sleeve (6) is greater than the outer diameter of the positioning column (51) and less than the outer diameter of the external thread (52).

6. A self-pressurizing device for a solid oxide stack as claimed in claim 3, characterized in that A sealing element (9) is arranged between the base (5) and the stack (4), and the outer dimension of the sealing element (9) is the same as the bottom surface dimension of the stack (4).

7. A self-pressurizing device for a solid oxide stack according to claim 6, characterized in that An insulating plate (8) is arranged between the pressing plate (2) and the stack (4), and the outer dimension of the insulating plate (8) is the same as the top surface dimension of the stack (4).

8. A self-pressurizing device for a solid oxide stack as claimed in claim 1, characterized in that Four circular grooves (22) are formed in the top surface of the pressing plate (2), the ball (3) is placed in each circular groove (22), the ball (3) is in contact with the bottom of the pressing block (1), and the ball (3) transmits the fastening force between the pressing block (1) and the pressing plate (2).

9. A self-pressurizing device for a solid oxide stack as claimed in claim 1, characterized in that Four air tubes (53) are connected to the side surface of the base (5), and four air holes are formed in the bottom of the stack (4) and connected with the four air tubes (53) respectively.

10. A self-pressurizing device for a solid oxide stack as claimed in claim 7, characterized in that The center height of the external thread (52) is the same as the sum of the heights of the sealing element (9), the stack (4) and the insulating plate (8) after being pressed.

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