Solid oxide fuel cell system

Abstract

The application discloses a kind of solid oxide fuel cell systems, it is related to fuel cell technical field, solid oxide fuel cell system includes electric pile component, ventilation component, sealing joint and pressing assembly, the ventilation component is oppositely arranged with the electric pile component;The sealing joint includes first joint and second joint, the first joint is located in the electric pile component, the second joint is located in the ventilation component, the first joint is inlayed with the second joint Connection, and inlaying is formed with the gas flow channel that the electric pile component and the ventilation component are communicated;The pressing assembly is located in the electric pile component, for applying pressure to the electric pile component towards the ventilation component, to compact the electric pile component, and make the first joint with the second joint sealing abutment.The application aims at reducing the structural complexity of system, to improve assembly efficiency.

Description

Technical Field

[0001] This invention relates to the field of fuel cell technology, and in particular to a solid oxide fuel cell system. Background Technology

[0002] Solid oxide fuel cells (SOFCs) are electrochemical devices that directly convert the chemical energy of fuel gas and oxidizing gas into electrical energy. They have advantages such as high energy conversion efficiency, wide fuel adaptability, and environmental friendliness.

[0003] In a SOFC system, the fuel cell stack assembly, as the core component, requires a certain axial pressure to be applied through a clamping structure to ensure stable electrical contact between the electrodes of each individual cell. This prevents increased contact resistance and localized heating due to localized gaps at the contact interface, which could affect the long-term stable operation of the fuel cell stack assembly. Simultaneously, the fuel cell stack assembly also needs to be connected to the venting assembly through a sealing structure to stably supply fuel gas and oxidant gas to each individual cell or reaction zone. The sealing structure typically employs a flange connection, using external flanges and matching fasteners and seals to achieve the connection and sealing of the gas pipelines.

[0004] However, the aforementioned clamping structure and sealing structure are set up independently. The clamping structure is only used to apply axial pressure to the fuel cell stack assembly, and the sealing structure is only used to achieve gas communication and sealing between the fuel cell stack assembly and the ventilation assembly. This results in a complex system structure, cumbersome assembly steps, and is not conducive to miniaturization and integrated design. Summary of the Invention

[0005] The main objective of this invention is to propose a solid oxide fuel cell system that aims to reduce the structural complexity of the system in order to improve assembly efficiency.

[0006] To achieve the above objectives, the present invention proposes a solid oxide fuel cell system, characterized in that the solid oxide fuel cell system comprises: fuel cell stack assembly; A ventilation assembly, which is disposed opposite to the fuel cell stack assembly; A sealing joint, comprising a first joint and a second joint, wherein the first joint is disposed on the fuel cell assembly, and the second joint is disposed on the venting assembly, the first joint and the second joint being fitted together to form a gas flow channel connecting the fuel cell assembly and the venting assembly; and A clamping assembly, disposed on the fuel cell assembly, is used to apply pressure toward the venting assembly to clamp the fuel cell assembly and to seal the first connector against the second connector.

[0007] In one embodiment, the first connector has a first air passage extending through the first connector along its axial direction, and the second connector has a second air passage extending through the second connector along its axial direction. The end of the first connector away from the fuel cell assembly is embedded in the second connector so that the first gas passage and the second gas passage are connected to form the gas flow channel.

[0008] In one embodiment, the first connector includes a first connecting portion, a transition portion, and a first fitting portion connected in sequence, the first air passage passing through the first connecting portion, the transition portion, and the first fitting portion, and the cross-sectional dimension of the transition portion gradually decreases from the first connecting portion to the first fitting portion; The second connector includes a second connecting part and a second fitting part connected in sequence, and the second air passage passes through the second connecting part and the second fitting part; The first connecting part is connected to the fuel cell assembly, the second connecting part is connected to the ventilation assembly, and the first fitting part is embedded in the second fitting part.

[0009] In one embodiment, the height of the first fitting portion does not exceed the depth of the second fitting portion; When the first fitting part is fitted into the second fitting part, the outer side wall of the transition part abuts against the inner side wall of the second fitting part.

[0010] In one embodiment, the solid oxide fuel cell system further includes a sealing gasket disposed between the end face of the first fitting portion away from the transition portion and the inner bottom surface of the second fitting portion.

[0011] In one embodiment, the solid oxide fuel cell system further includes a first substrate, a second substrate, and a third substrate arranged sequentially along the compression direction. The fuel cell stack assembly is disposed between the first substrate and the second substrate. The first connector and the second connector are located between the second substrate and the third substrate. The first connector is disposed on the second substrate and communicates with the fuel cell stack assembly through a first vent hole on the second substrate. The second connector is disposed on the third substrate and communicates with the ventilation assembly through a second vent hole on the third substrate. The clamping assembly is located on the side of the first substrate away from the second substrate and is connected to the third substrate, for applying pressure to the first substrate toward the third substrate.

[0012] In one embodiment, the clamping assembly includes: A guide rod, one end of which is connected to the third substrate, and the other end of which passes through the second substrate and the first substrate in sequence; and A clamping member is movably sleeved on the end of the guide rod away from the third substrate and abuts against the end of the first substrate away from the third substrate; When the clamping member moves toward the third substrate along the extension direction of the guide rod, it applies pressure to the first substrate.

[0013] In one embodiment, the first substrate has a connecting hole for the guide rod to pass through, and the clamping assembly further includes a sleeve, which is sleeved on the end of the guide rod away from the third substrate, and the radius of the sleeve is larger than the diameter of the connecting hole, and the sleeve abuts against the end of the first substrate away from the third substrate.

[0014] In one embodiment, the clamping assembly further includes a first gasket, a second gasket, and an elastic element, wherein the first gasket and the second gasket are spaced apart and sleeved on the end of the guide rod away from the third substrate, and the elastic element is disposed between the first gasket and the second gasket; The clamping member abuts against the first gasket and presses the second gasket against the sleeve.

[0015] In one embodiment, the guide rod is a screw, the clamping member is a nut, and the guide rod and the clamping member are threaded together.

[0016] The technical solution of the present invention, by placing the clamping component on the fuel cell assembly, allows the clamping component to apply pressure to the fuel cell assembly to clamp it while simultaneously moving the fuel cell assembly toward the venting component. This results in the first connector and the second connector sealing and abutting in an engaged state, achieving an integrated setup of fuel cell clamping and gas interface sealing. This reduces the use of independent sealing structures, lowers the structural complexity of the system, and improves assembly efficiency. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention 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 only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of a solid oxide fuel cell system according to an embodiment of the present invention; Figure 2 A schematic diagram of a solid oxide fuel cell system from another perspective; Figure 3 This is an exploded view of a solid oxide fuel cell system. Figure 4 This is a schematic diagram of the structure of a sealing joint in a solid oxide fuel cell system; Figure 5 This is an exploded view of a sealing joint in a solid oxide fuel cell system. Figure 6 This is a cross-sectional view of a sealing joint in a solid oxide fuel cell system. Figure 7 This is a schematic diagram of the extrusion assembly in a solid oxide fuel cell system.

[0019] Explanation of icon numbers: 100. Solid oxide fuel cell system; 1. First substrate; 11. Connecting hole; 2. Second substrate; 21. First vent hole; 3. Third substrate; 31. Second vent hole; 4. Sealing joint; 41. First joint; 411. First connecting part; 412. Transition part; 413. First fitting part; 414. First air passage; 42. Second joint; 421. Second connecting part; 422. Second fitting part; 423. Second air passage; 424. Positioning hole; 43. Gas flow channel; 44. Sealing gasket; 5. Stack assembly; 6. Clamping assembly; 61. Guide rod; 62. Sleeve; 63. Clamping element; 64. Elastic element; 65. First gasket; 66. Second gasket; 7. Venting assembly.

[0020] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0021] 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 a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0022] It should be noted that if the embodiments of the present invention involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0023] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0024] Solid oxide fuel cells (SOFCs) are electrochemical devices that directly convert the chemical energy of fuel gas and oxidizing gas into electrical energy. They have advantages such as high energy conversion efficiency, wide fuel adaptability, and environmental friendliness.

[0025] In a SOFC system, the fuel cell stack assembly, as the core component, requires a certain axial pressure to be applied through a clamping structure to ensure stable electrical contact between the electrodes of each individual cell. This prevents increased contact resistance and localized heating due to localized gaps at the contact interface, which could affect the long-term stable operation of the fuel cell stack assembly. Simultaneously, the fuel cell stack assembly also needs to be connected to the venting assembly through a sealing structure to stably supply fuel gas and oxidant gas to each individual cell or reaction zone. The sealing structure typically employs a flange connection, using external flanges and matching fasteners and seals to achieve the connection and sealing of the gas pipelines.

[0026] However, the aforementioned clamping structure and sealing structure are set up independently. The clamping structure is only used to apply axial pressure to the fuel cell stack assembly, and the sealing structure is only used to achieve gas communication and sealing between the fuel cell stack assembly and the ventilation assembly. This results in a complex system structure, cumbersome assembly steps, and is not conducive to miniaturization and integrated design.

[0027] To address the aforementioned issues, this invention proposes a solid oxide fuel cell system 100, which aims to reduce the structural complexity of the system and improve assembly efficiency.

[0028] Please see Figure 1In one embodiment of the present invention, the solid oxide fuel cell system 100 includes a stack assembly 5, a ventilation assembly 7, a sealing joint 4, and a pressing assembly 6. The ventilation assembly 7 is disposed opposite to the stack assembly 5. The sealing joint 4 includes a first joint 41 and a second joint 42. The first joint 41 is disposed on the stack assembly 5, and the second joint 42 is disposed on the ventilation assembly 7. The first joint 41 and the second joint 42 are fitted together and connected, and after fitting together, a gas flow channel 43 is formed connecting the stack assembly 5 and the ventilation assembly 7. The pressing assembly 6 is disposed on the stack assembly 5 and is used to apply pressure toward the ventilation assembly 7 to the stack assembly 5 to press the stack assembly 5 and to seal the first joint 41 and the second joint 42.

[0029] In this embodiment, the fuel cell stack assembly 5 and the venting assembly 7 are arranged opposite each other along the pressing direction, and the sealing joint 4 is disposed between the two. The first joint 41 is fixed to the side of the fuel cell stack assembly 5 near the venting assembly 7, and the second joint 42 is fixed to the side of the venting assembly 7 near the fuel cell stack assembly 5. The first joint 41 and the second joint 42 are fitted together to form a gas flow channel 43, which is used to guide the gas in the venting assembly 7 into the interior of the fuel cell stack assembly 5. The pressing assembly 6 is installed at the end of the fuel cell stack assembly 5 away from the venting assembly 7.

[0030] Understandably, when the clamping assembly 6 operates, it applies pressure to the fuel cell assembly 5 towards the venting assembly 7. This pressure acts on the fuel cell assembly 5 itself, maintaining stable electrical contact between the individual cell electrodes within the assembly. Simultaneously, this pressure is transmitted through the fuel cell assembly 5 to the first connector 41, causing the first connector 41 and the second connector 42 to abut against each other in an engaged state, thereby sealing the gas flow channel 43. With this configuration, the clamping assembly 6 simultaneously performs the function of clamping the fuel cell assembly 5 and sealing the connection between the venting assembly 7 and the fuel cell assembly 5, eliminating the need for two separate structures.

[0031] It should be noted that in this embodiment, the ventilation assembly 7 has multiple pipes inside, which are used to transport fuel gas and oxidant gas respectively, to meet the independent transport requirements of the two reaction gases during the operation of the solid oxide fuel cell. This solution does not specifically limit the number, arrangement, cross-sectional shape, and connection relationship of each pipe inside the ventilation assembly 7. Those skilled in the art can flexibly design it based on factors such as the number of cells in the fuel cell stack 5, gas flow requirements, and the overall system layout. For example, the ventilation assembly 7 can have one oxidant gas pipe and multiple fuel gas pipes, or multiple oxidant gas pipes and multiple fuel gas pipes. These pipes can be arranged in parallel, stacked, or around each other. One end of each pipe is connected to an external gas source, and the other end is connected to the fuel cell stack 5. As long as independent and stable transport of fuel gas and oxidant gas can be achieved, it should fall within the scope of protection of this application.

[0032] Simultaneously, the gas flow channel 43 formed by the sealing joint 4 is used to transport the reaction gas, which is at least one of oxidizing gas and fuel gas. For example, oxidizing gas is transported through the gas flow channel 43 formed by the sealing joint 4, while fuel gas is transported through a corresponding gas delivery channel. This gas delivery channel can be connected and sealed using a flange connection structure, a welded structure, or a plug-in structure. Alternatively, fuel gas is transported through the gas flow channel 43, while oxidizing gas is transported through the gas delivery channel. Or, the sealing joint 4 includes at least two to form at least two gas flow channels 43, with fuel gas and oxidizing gas transported through different gas flow channels 43 respectively. In this application, as long as independent transport of oxidizing gas and fuel gas can be achieved, and mixing of the two gases during transport is avoided, it should fall within the scope of protection of this application.

[0033] In one implementation, please refer to Figure 4 , Figure 5 and Figure 6 The first connector 41 has a first air passage 414 through it along its axial direction, and the second connector 42 has a second air passage 423 through it along its axial direction. The end of the first connector 41 away from the fuel cell assembly 5 is embedded in the second connector 42 so that the first air passage 414 and the second air passage 423 are connected to form a gas flow channel 43.

[0034] In this embodiment, both the first connector 41 and the second connector 42 are hollow structures. The first air passage 414 extends through the entire first connector 41 along its axial direction, and the second air passage 423 extends through the entire second connector 42 along its axial direction. The end of the first connector 41 closest to the second connector 42 is embedded inside the second connector 42. The outlet of the first air passage 414 is connected to the inlet of the second air passage 423, and the first air passage 414 and the second air passage 423 cooperate to form a complete gas flow channel 43.

[0035] Understandably, by using a fitted connection, the mating surfaces between the first air passage 414 and the second air passage 423 are surrounded by the outer peripheral wall of the first connector 41 and the inner peripheral wall of the second connector 42, reducing the risk of gas leakage from the mating point.

[0036] In one embodiment, the cross-sectional shapes of the first air passage 414 and the second air passage 423 are circular, elliptical, rectangular, or irregular, etc., to adapt to different gas flow requirements.

[0037] In one implementation, please refer to Figure 4 , Figure 5 and Figure 6 The first connector 41 includes a first connecting portion 411, a transition portion 412, and a first fitting portion 413 connected in sequence. A first air passage 414 passes through the first connecting portion 411, the transition portion 412, and the first fitting portion 413. The cross-sectional dimension of the transition portion 412 gradually decreases from the first connecting portion 411 to the first fitting portion 413. The second connector 42 includes a second connecting portion 421 and a second fitting portion 422 connected in sequence. A second air passage 423 passes through the second connecting portion 421 and the second fitting portion 422. The first connecting portion 411 is connected to the fuel cell assembly 5, the second connecting portion 421 is connected to the ventilation assembly 7, and the first fitting portion 413 is fitted inside the second fitting portion 422.

[0038] In this embodiment, the first connecting portion 411, the transition portion 412, and the first fitting portion 413 are connected sequentially to form the first connector 41. The first air passage 414 extends through the first connecting portion 411, the transition portion 412, and the first fitting portion 413 along the axial direction. The cross-sectional dimensions of the transition portion 412 gradually shrink along the axial direction of the first connector 41 to form a conical or frustum-shaped structure, thereby making the outer diameter of the first fitting portion 413 smaller than the outer diameter of the first connecting portion 411, facilitating the smooth insertion of the first fitting portion 413 into the second fitting portion 422. Simultaneously, the second connector 42 includes a second connecting portion 421 and a second fitting portion 422. The second air passage 423 extends through the second connecting portion 421 and the second fitting portion 422 along the axial direction. The second fitting portion 422 is recessed inward to form a receiving space for accommodating the first fitting portion 413. The first connecting part 411 is connected to the fuel cell assembly 5, the second connecting part 421 is connected to the ventilation assembly 7, and after the first fitting part 413 is inserted into the second fitting part 422, the first air passage 414 and the second air passage 423 are connected.

[0039] Specifically, the transition portion 412 has a frustum structure, gradually narrowing from the first connecting portion 411 towards the first fitting portion 413, forming four inclined sides. The first fitting portion is a cylindrical structure, and the internal space of the second fitting portion is correspondingly set as a cylindrical structure, with the inner diameter of the second fitting portion equal to the outer diameter of the first fitting portion. Understandably, when the first fitting portion 413 is fitted into the second fitting portion 422, the outer cylindrical surface of the first fitting portion 413 mates with the inner cylindrical surface of the second fitting portion 422 to reduce wobbling. Simultaneously, the first connecting portion 411 has a cuboid structure, facilitating a close fit with the corresponding mounting surface.

[0040] Understandably, by providing the transition portion 412, the first fitting portion 413 can be inserted into the second fitting portion 422 more smoothly during assembly, reducing the alignment difficulty and assembly accuracy requirements. Simultaneously, after the first fitting portion 413 is inserted into the second fitting portion 422, the outer peripheral wall of the transition portion 412 and the inner sidewall of the second fitting portion 422 form a gradually tightening fit. Under the pressure applied by the clamping assembly 6, the contact pressure of the mating surfaces gradually increases along the fitting direction, thereby improving the sealing reliability of the sealing joint 4.

[0041] In one implementation, please refer to Figure 4 , Figure 5 and Figure 6The second fitting part 422 is provided with a positioning hole 424 for accommodating the first fitting part 413. The positioning hole 424 is coaxially arranged with the second air passage 423. The second air passage 423 passes through the positioning hole 424 along the axial direction of the second fitting part 422, and the diameter of the positioning hole 424 is larger than the radius of the second air passage 423. The diameter of the positioning hole 424 is equal to the outer diameter of the first fitting part 413, and the radius of the first air passage 414 is equal to the radius of the second air passage 423.

[0042] Understandably, since the diameter of the positioning hole 424 is equal to the outer diameter of the first fitting part 413, when the first fitting part 413 is inserted into the positioning hole 424, the outer peripheral wall of the first fitting part 413 and the inner peripheral wall of the positioning hole 424 are matched in a limiting fit to ensure the stability of the connection. At the same time, since the radius of the first air passage 414 is equal to the radius of the second air passage 423, a radially protruding step structure will not be formed at the connection between the first air passage 414 and the second air passage 423, thereby avoiding interference with the flow of gas.

[0043] In another embodiment, the mating relationship between the first connector 41 and the second connector 42 is reversed compared to the above embodiment. Specifically, the first mating portion 413 is recessed outward to form a receiving space, and the second mating portion 422 protrudes outward to form an insertion portion. The second mating portion 422 is embedded inside the first mating portion 413 to achieve a mating connection between the first connector 41 and the second connector 42. Simultaneously, the cross-sectional dimension of the second mating portion 422 can gradually decrease in the direction away from the second connecting portion 421 to form a conical or frustum-shaped structure, facilitating insertion into the first mating portion 413. After mating, the first air passage 414 and the second air passage 423 remain connected, forming a complete gas flow channel 43. The pressure applied by the pressing assembly 6 is transmitted to the first connector 41 through the fuel cell assembly 5, causing the inner peripheral wall of the first mating portion 413 to tightly adhere to the outer peripheral wall of the second mating portion 422, achieving a seal.

[0044] In one implementation, please refer to Figure 4 , Figure 5 and Figure 6 The height of the first fitting portion 413 does not exceed the depth of the second fitting portion 422. When the first fitting portion 413 is fitted into the second fitting portion 422, the outer side wall of the transition portion 412 abuts against the inner side wall of the second fitting portion 422.

[0045] In this embodiment, the dimension of the first fitting portion 413 along its axial direction is less than or equal to the axial dimension of the positioning hole 424.

[0046] Understandably, with this configuration, when the first fitting part 413 is fully embedded inside the second fitting part 422, the end face of the first fitting part 413 away from the transition part 412 remains flush with or has a certain gap from the inner bottom surface of the second fitting part 422. At this time, the transition part 412 is located between the first fitting part 413 and the first connecting part 411, and the outer wall of the transition part 412 abuts against the inner wall of the second fitting part 422 near the opening to achieve a seal. At the same time, the pressure applied by the clamping assembly 6 can be evenly transmitted to the inner wall of the second fitting part 422 through the transition part 412, avoiding pressure concentration on the end face of the first fitting part 413, thereby improving the sealing stability of the sealing joint 4 in a high-pressure gas environment.

[0047] In one implementation, please refer to Figure 4 , Figure 5 and Figure 6 The solid oxide fuel cell system 100 also includes a sealing gasket 44, which is disposed between the end face of the first fitting portion 413 away from the transition portion 412 and the inner bottom surface of the second fitting portion 422.

[0048] In this embodiment, the sealing gasket 44 is an annular structure and is disposed between the end face of the first fitting part 413 and the inner bottom surface of the second fitting part 422. At the same time, a through hole is provided in the middle position of the sealing gasket 44 for gas flow.

[0049] Understandably, when the clamping assembly 6 applies pressure to the fuel cell assembly 5, the pressure is transmitted to the first fitting part 413 through the first connector 41, causing the end face of the first fitting part 413 to press against the sealing gasket 44. The sealing gasket 44 undergoes elastic deformation under pressure, thereby filling the gap between the end face of the first fitting part 413 and the inner bottom surface of the second fitting part 422 to prevent gas from leaking outward.

[0050] In one embodiment, the sealing gasket 44 is a graphite gasket, a metal spiral wound gasket, or a rubber gasket.

[0051] In one implementation, please refer to Figure 2 and Figure 3 The solid oxide fuel cell system 100 further includes a first substrate 1, a second substrate 2, and a third substrate 3 arranged sequentially along the pressing direction. The stack assembly 5 is disposed between the first substrate 1 and the second substrate 2. The first connector 41 and the second connector 42 are located between the second substrate 2 and the third substrate 3. The first connector 41 is disposed on the second substrate 2 and communicates with the stack assembly 5 through the first vent 21 of the second substrate 2. The second connector 42 is disposed on the third substrate 3 and communicates with the ventilation assembly 7 through the second vent 31 of the third substrate 3. The pressing assembly 6 is disposed on the side of the first substrate 1 away from the second substrate 2 and is connected to the third substrate 3 for applying pressure to the first substrate 1 toward the third substrate 3.

[0052] In this embodiment, the third substrate 3 serves as the supporting foundation for the entire structure, supporting other components. The first substrate 1, the second substrate 2, and the third substrate 3 are stacked sequentially along the pressing direction of the pressing assembly 6. An installation space for accommodating the fuel cell stack assembly 5 is formed between the first substrate 1 and the second substrate 2, and an installation space for accommodating the sealing joint 4 is formed between the second substrate 2 and the third substrate 3. The first joint 41 is fixed to the side of the second substrate 2 near the third substrate 3 and communicates with the fuel cell stack assembly 5 through a first vent hole 21 penetrating the second substrate 2. The second joint 42 is fixed to the side of the third substrate 3 near the second substrate 2 and communicates with the venting assembly 7 through a second vent hole 31 penetrating the third substrate 3.

[0053] Simultaneously, the clamping assembly 6 is installed on the side of the first substrate 1 away from the second substrate 2. The force-applying end of the clamping assembly 6 acts on the first substrate 1, while the other end passes through the second substrate 2 and connects to the third substrate 3. It can be understood that by having the clamping assembly 6 pass through the second substrate 2, the second substrate 2 is connected in series in the force transmission path of the clamping assembly 6. When the clamping assembly 6 applies pressure to the first substrate 1 in the direction towards the third substrate 3, this pressure is sequentially transmitted to the first substrate 1, the fuel cell assembly 5, the second substrate 2, the sealing joint 4, and the third substrate 3. This causes the fuel cell assembly 5 between the first substrate 1 and the second substrate 2 to be axially clamped, while the first joint 41 and the second joint 42 between the second substrate 2 and the third substrate 3 are clamped and sealed. With this configuration, the second substrate 2 is positioned and guided by the clamping assembly 6 during the clamping process, ensuring that the first substrate 1, the second substrate 2, and the third substrate 3 move only along the clamping direction and do not experience lateral displacement.

[0054] In another embodiment, the clamping component 6 is connected to both the first substrate 1 and the third substrate 3, and a gap is provided between the clamping component 6 and the second substrate 2. In this case, the clamping component 6 does not penetrate the second substrate 2.

[0055] Understandably, with this configuration, the pressure applied by the clamping component 6 acts directly on the first substrate 1. Simultaneously, during the pressing process, the pressure is also transmitted through the fuel cell assembly 5 to the second substrate 2, and then from the second substrate 2 to the sealing joint 4 and the third substrate 3. This achieves both clamping of the fuel cell assembly and sealing pressure on the sealing joint 4. Since the clamping component 6 does not penetrate the second substrate 2, there is no need to create holes on the second substrate 2 for the clamping component 6 to pass through, simplifying the processing steps of the second substrate 2. Furthermore, the second substrate 2 can be fixed to the bottom of the fuel cell assembly 5 to prevent lateral displacement of the second substrate 2 relative to the fuel cell assembly 5 during the clamping process.

[0056] It should be noted that the specific structural form of the clamping component 6 is not limited to the specific structure described in this solution. As long as the clamping component 6 can apply pressure to the fuel cell stack assembly 5 in the direction of the ventilation component 7, and ensures that the pressure is sufficient to clamp the fuel cell stack assembly 5, and that the first connector 41 and the second connector 42 achieve a sealed contact in the mating state, it is acceptable. For example, the clamping component 6 can be configured as a linear drive device such as a hydraulic cylinder, a pneumatic cylinder, or an electric push rod, or it can be configured as a cam mechanism, a wedge mechanism, or other mechanical transmission structure capable of achieving linear clamping motion.

[0057] In one embodiment, the venting assembly 7 includes multiple side plates and a bottom plate. The side plates, bottom plate, and third substrate 3 enclose a mounting cavity for mounting multiple pipes to transport corresponding gases. In this case, the venting assembly 7 can directly support other components. Specifically, the area of ​​the third substrate 3 is larger than the area of ​​the bottom plate to provide sufficient support area.

[0058] In another embodiment, the ventilation component 7 itself directly encloses and forms an installation cavity, and the ventilation component 7 is connected to the third substrate 3 through a corresponding fixing structure. In this case, the ventilation component 7, as a separate functional module, can be directly disassembled and assembled for easy maintenance.

[0059] In one embodiment, the first vent 21 and the second vent 31 are coaxially arranged to ensure smooth gas flow.

[0060] In one embodiment, multiple first vent holes 21 and multiple second vent holes 31 are provided, and each first vent hole 21 is connected to a second vent hole 31 through a sealing joint 4, thereby enabling the simultaneous delivery of multiple gases.

[0061] In one implementation, please refer to Figure 2 and Figure 7 The clamping assembly 6 includes a guide rod 61 and a clamping member 63. One end of the guide rod 61 is connected to the third substrate 3, and the other end of the guide rod 61 passes through the second substrate 2 and the first substrate 1 in sequence. The clamping member 63 is movably sleeved on the end of the guide rod 61 away from the third substrate 3 and abuts against the end of the first substrate 1 away from the third substrate 3. When the clamping member 63 moves towards the third substrate 3 along the extending direction of the guide rod 61, it applies pressure to the first substrate 1.

[0062] In this embodiment, the guide rod 61 extends along the pressing direction. One end of the guide rod 61 near the third substrate 3 is fixedly connected to the third substrate 3, and the other end passes through the second substrate 2 and the first substrate 1 in sequence, and protrudes from the side of the first substrate 1 away from the third substrate 3. The pressing member 63 is sleeved on the protruding end of the guide rod 61 and can slide along the axial direction of the guide rod 61. The bottom end of the pressing member 63 abuts against the outer end face of the first substrate 1 away from the third substrate 3. When the pressing member 63 moves along the guide rod 61 toward the third substrate 3 under the action of external force, the pressing member 63 generates axial pressure on the first substrate 1 toward the third substrate 3. This pressure is transmitted sequentially to the first substrate 1, the fuel cell assembly 5, the second substrate 2, the sealing joint 4, and the third substrate 3, thereby simultaneously realizing the axial pressing of the fuel cell assembly 5 and the sealing contact of the sealing joint 4.

[0063] Specifically, please refer to Figure 2 and Figure 7 The guide rod 61 is a screw, and the clamping member 63 is a nut that is threaded into the guide rod 61. At this time, by rotating the nut, the clamping member 63 can be moved axially along the guide rod 61.

[0064] In another embodiment, the clamping member 63 is also provided on the side of the second substrate 2 facing away from the third substrate 3.

[0065] Specifically, the clamping member 63 is not only located on the side of the first substrate 1 away from the third substrate 3, but also additionally located on the side of the second substrate 2 facing away from the third substrate 3. For ease of description, the clamping member 63 on the first substrate 1 is defined as the first clamping member, and the clamping member 63 on the second substrate 2 is defined as the second clamping member. It can be understood that the first clamping member is movably sleeved on the side of the guide rod 61 away from the third substrate 3 and abuts against the end face of the first substrate 1 away from the third substrate 3, used to apply pressure to the first substrate 1 towards the third substrate 3 to clamp the fuel cell assembly 5. The second clamping member is also sleeved on the guide rod 61 and located on the side of the second substrate 2 facing the first substrate 1, used to apply pressure to the second substrate 2 towards the third substrate 3 to directly clamp the sealing joint 4. The first and second clamping members are spaced apart along the axial direction of the guide rod 61, and their respective axial positions can be independently adjusted to control the clamping force of the fuel cell assembly 5 and the sealing clamping force of the sealing joint 4, ensuring that both receive sufficient clamping force.

[0066] In another embodiment, the guide rod 61 passes through the third substrate 3, and the clamping member 63 is also provided on the side of the third substrate 3 facing away from the first substrate 1.

[0067] Specifically, the clamping member 63 is not only located on the side of the first substrate 1 away from the third substrate 3, but also additionally located on the side of the third substrate 3 facing away from the first substrate 1. For ease of description, the clamping member 63 on the first substrate 1 is defined as the first clamping member, and the clamping member 63 on the third substrate 3 is defined as the third clamping member. The third clamping member is sleeved on the end of the guide rod 61 that protrudes from the third substrate 3 and abuts against the end face of the third substrate 3 facing away from the first substrate 1. When the third clamping member moves towards the first substrate 1 along the guide rod 61 under the action of external force, the third clamping member applies a reaction force to the third substrate 3 in the direction of the first substrate 1. This reaction force causes the third substrate 3 to move towards the second substrate 2, thereby driving the second connector 402 to press against the first connector 401, so as to achieve the sealing contact of the sealing connector 4. With this configuration, the third clamping member and the first clamping member apply opposing pressures from both ends of the clamping path. The guide rod 61 bears tensile stress under the combined action of the clamping members 63 at both ends. The first substrate 1, the fuel cell assembly 5, the second substrate 2, the sealing joint 4, and the third substrate 3 are clamped between the first clamping member and the third clamping member, forming a bidirectional clamping structure.

[0068] In another embodiment, the clamping member 63 includes a first clamping member, a second clamping member, and a third clamping member. The first clamping member is disposed on the side of the first substrate 1 away from the third substrate 3, the second clamping member is disposed on the side of the second substrate 2 facing away from the third substrate 3, and the third clamping member is disposed on the side of the third substrate 3 facing away from the first substrate 1. The first, second, and third clamping members are all sleeved on the guide rod 61 and can move axially along the guide rod 61 to apply clamping force to the first substrate 1, the second substrate 2, and the third substrate 3 respectively, thereby simultaneously achieving the clamping of the fuel cell assembly 5 and the sealing contact of the sealing joint 4. This embodiment is similar to the arrangement and working principle of the clamping members 63 in the above embodiments, and will not be described in detail here.

[0069] In one embodiment, the guide rod 61 is fixedly connected to the third substrate 3 by means of threaded connection, welding or interference fit.

[0070] In one embodiment, the guide rod 61 is threadedly connected to the second substrate 2 so that the guide rod 61 can position the second substrate 2 while transmitting pressure.

[0071] In one embodiment, the guide rods 61 include a plurality of guide rods 61, which are evenly distributed along the circumference of the first substrate 1 to ensure uniform force distribution.

[0072] In one implementation, please refer to Figure 3The first substrate 1 is provided with a connecting hole 11 for the guide rod 61 to pass through. The clamping assembly 6 also includes a sleeve 62, which is sleeved on the end of the guide rod 61 away from the third substrate 3. The radius of the sleeve 62 is larger than the diameter of the connecting hole 11. The sleeve 62 abuts against the end of the first substrate 1 away from the third substrate 3.

[0073] In this embodiment, a connecting hole 11 is provided on the first substrate 1, which penetrates the first substrate 1 along the pressing direction so that the guide rod 61 can pass through. The pressing assembly 6 is also provided with a sleeve 62, which is sleeved on the side of the guide rod 61 located on the first substrate 1 away from the third substrate 3, and the outer diameter of the sleeve 62 is larger than the diameter of the connecting hole 11. The bottom end of the sleeve 62 abuts against the end face of the first substrate 1 away from the third substrate 3.

[0074] Understandably, with this configuration, the axial pressure applied by the clamping member 63 is transmitted to the first substrate 1 through the sleeve 62, increasing the contact area between the clamping assembly 6 and the first substrate 1, and preventing the clamping member 63 from acting directly on the first substrate 1, thus avoiding localized stress concentration. At the same time, the sleeve 62 can confine the guide rod 61 on the first substrate 1, playing a certain limiting role and preventing the guide rod 61 from sliding out of the connecting hole 11.

[0075] In one embodiment, the sleeve 62 and the guide rod 61 are integrally formed. Alternatively, the sleeve 62 and the guide rod 61 are fixed by welding, threaded connection, or snap-fit.

[0076] In one implementation, please refer to Figure 7 The clamping assembly 6 further includes a first gasket 65, a second gasket 66, and an elastic member 64. The first gasket 65 and the second gasket 66 are spaced apart and sleeved on the end of the guide rod 61 away from the third substrate 3. The elastic member 64 is disposed between the first gasket 65 and the second gasket 66. The clamping member 63 abuts against the first gasket 65 and presses the second gasket 66 against the sleeve 62.

[0077] In this embodiment, the clamping assembly 6 further includes a first gasket 65, a second gasket 66, and an elastic member 64. The first gasket 65, the second gasket 66, and the elastic member 64 are sequentially sleeved on the guide rod 61 along its extension direction and located on the side of the first substrate 1 away from the third substrate 3. The first gasket 65 and the second gasket 66 are spaced apart along the axial direction of the guide rod 61, and the elastic member 64 is clamped between the first gasket 65 and the second gasket 66. The clamping member 63 abuts against the side of the first gasket 65 away from the elastic member 64.

[0078] Understandably, when the clamping member 63 moves along the guide rod 61 toward the third substrate 3 under the action of external force, the clamping member 63 pushes the first gasket 65 to compress the elastic member 64. During the compression deformation process, the elastic member 64 generates elastic force, which is transmitted to the sleeve 62 through the second gasket 66, and then to the first substrate 1 through the sleeve 62, ultimately forming an axial clamping force on the fuel cell assembly 5 and a sealing pressure on the sealing joint 4. By setting the first gasket 65 and the second gasket 66, the bearing area at both ends of the elastic member 64 is increased, avoiding non-uniform deformation at the ends of the elastic member 64 due to local stress concentration, thus ensuring the stability of the movement process.

[0079] The above description is merely an exemplary embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformations made using the contents of the present invention specification and drawings under the technical concept of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A solid oxide fuel cell system, characterized in that, The solid oxide fuel cell system includes: fuel cell stack assembly; A ventilation assembly, which is disposed opposite to the fuel cell stack assembly; A sealing joint, comprising a first joint and a second joint, wherein the first joint is disposed on the fuel cell assembly, and the second joint is disposed on the venting assembly, the first joint and the second joint being fitted together to form a gas flow channel connecting the fuel cell assembly and the venting assembly; and A clamping assembly, disposed on the fuel cell assembly, is used to apply pressure toward the venting assembly to clamp the fuel cell assembly and to seal the first connector against the second connector.

2. The solid oxide fuel cell system as described in claim 1, characterized in that, The first connector has a first air passage through it along its axial direction, and the second connector has a second air passage through it along its axial direction. The end of the first connector away from the fuel cell assembly is embedded in the second connector so that the first gas passage and the second gas passage are connected to form the gas flow channel.

3. The solid oxide fuel cell system as described in claim 2, characterized in that, The first connector includes a first connecting part, a transition part, and a first fitting part connected in sequence. The first air passage passes through the first connecting part, the transition part, and the first fitting part. The cross-sectional dimension of the transition part gradually decreases from the first connecting part to the first fitting part. The second connector includes a second connecting part and a second fitting part connected in sequence, and the second air passage passes through the second connecting part and the second fitting part; The first connecting part is connected to the fuel cell assembly, the second connecting part is connected to the ventilation assembly, and the first fitting part is embedded in the second fitting part.

4. The solid oxide fuel cell system as described in claim 3, characterized in that, The height of the first fitting portion does not exceed the depth of the second fitting portion; When the first fitting part is fitted into the second fitting part, the outer side wall of the transition part abuts against the inner side wall of the second fitting part.

5. The solid oxide fuel cell system as described in claim 3, characterized in that, The solid oxide fuel cell system further includes a sealing gasket disposed between the end face of the first fitting portion away from the transition portion and the inner bottom surface of the second fitting portion.

6. The solid oxide fuel cell system according to any one of claims 1 to 5, characterized in that, The solid oxide fuel cell system further includes a first substrate, a second substrate, and a third substrate arranged sequentially along the pressing direction. The stack assembly is disposed between the first substrate and the second substrate. The first connector and the second connector are located between the second substrate and the third substrate. The first connector is disposed on the second substrate and communicates with the stack assembly through a first vent hole on the second substrate. The second connector is disposed on the third substrate and communicates with the ventilation assembly through a second vent hole on the third substrate. The clamping assembly is located on the side of the first substrate away from the second substrate and is connected to the third substrate, for applying pressure to the first substrate toward the third substrate.

7. The solid oxide fuel cell system as described in claim 6, characterized in that, The clamping assembly includes: A guide rod, one end of which is connected to the third substrate, and the other end of which passes through the second substrate and the first substrate in sequence; and A clamping member is movably sleeved on one end of the guide rod away from the third substrate and abuts against the side of the first substrate away from the third substrate. When the clamping member moves toward the third substrate along the extension direction of the guide rod, it applies pressure to the first substrate.

8. The solid oxide fuel cell system as described in claim 7, characterized in that, The first substrate has a connecting hole for the guide rod to pass through. The clamping assembly also includes a sleeve, which is sleeved on the end of the guide rod away from the third substrate. The radius of the sleeve is larger than the diameter of the connecting hole, and the sleeve abuts against the end of the first substrate away from the third substrate.

9. The solid oxide fuel cell system as described in claim 8, characterized in that, The clamping assembly further includes a first gasket, a second gasket, and an elastic element. The first gasket and the second gasket are spaced apart and sleeved on the end of the guide rod away from the third substrate. The elastic element is disposed between the first gasket and the second gasket. The clamping member abuts against the first gasket and presses the second gasket against the sleeve.

10. The solid oxide fuel cell system as described in claim 7, characterized in that, The guide rod is a screw, the clamping element is a nut, and the guide rod and the clamping element are threaded together.

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