Truss type end plate structure of fuel cell

Abstract

The invention discloses a truss type end plate structure of a fuel cell. The front end part is provided with a front end plate and a first reinforcing frame, the front end part is propped against the reactor core, and the surface formed by the front end plate is a first surface; the rear end part is provided with a rear end plate and a second reinforcing frame, and the rear end part also abuts against the reactor core and is located on the side, away from the front end part, of the reactor core; the limiting sleeve is arranged between the front end plate and the first reinforcing frame and between the rear end plate and the second reinforcing frame; limiting holes are integrally formed in the front end plate and the rear end plate respectively, the front end plate and the rear end plate are clamped in the limiting holes through limiting sleeves, the front end plate and the first reinforcing frame are fixed, the rear end plate and the second reinforcing frame are fixed, and therefore truss type structures are formed on the front end portion and the rear end portion respectively. The truss type structure is formed at the front end part and the rear end part, so that the rigidity of the front end plate and the rear end plate is improved.

Description

Technical Field

[0001] The invention relates to the field of fuel cells, and in particular to a truss-type end plate structure of a fuel cell. Background Art

[0002] As the world pays more attention to environmental protection and sustainable development, fuel cells are seen as an environmentally friendly, low-emission technology solution. Governments and environmental organizations encourage the use of fuel cells to reduce greenhouse gas emissions and air pollution. The byproduct of fuel cell reactions is water, and almost no carbon dioxide and other pollutants are produced, which can significantly reduce environmental pollution. Fuel cells, as an efficient energy conversion technology, can utilize renewable energy such as hydrogen to help achieve energy diversification and sustainable development.

[0003] At present, for the assembly method of fuel cells, the market usually uses end plates with flat structures for packaging and assembly. In order to prevent the end plates from bending and deformation, most existing fuel cells use a combination of flat structure end plates and arc-shaped reinforcement plates to improve the rigidity of the end plates. In the actual use of fuel cells, multiple fastening screws for clamping the two end plates are on the edges of the end plates. Under the pressure of the fastening screws, the core that abuts the end plate is subjected to less pressure in the middle area close to the end plate, while the area close to the edge of the end plate is subjected to greater pressure. The contact pressure between the bipolar plate and the membrane electrode in the area with less force is relatively small, which will produce a large contact resistance and reduce the overall output performance of the fuel cell stack. The contact pressure between the bipolar plate and the membrane electrode in the area with greater force is too large, which will cause irreversible mechanical damage to the membrane electrode, resulting in end plate failure and reducing the service life of the fuel cell stack.

[0004] Therefore, it is necessary to provide a fuel cell truss end plate structure that can effectively improve the rigidity of the end plate and avoid uneven pressure distribution on the core. Summary of the invention

[0005] The object of the present invention is to provide a fuel cell truss end plate structure which can effectively improve the rigidity of the end plate and avoid uneven pressure distribution on the core.

[0006] According to one aspect of the present application, a fuel cell truss end plate structure is provided, the structure comprising:

[0007] Core;

[0008] A front end portion is provided with a front end plate and a first reinforcement frame, the front end portion is in contact with the core, and a surface formed by the front end plate is a first surface;

[0009] A rear end portion is provided with a rear end plate and a second reinforcement frame, the rear end portion also abuts against the core and is located on a side of the core away from the front end portion;

[0010] A limiting sleeve, arranged between the front end plate and the first reinforcing frame, and between the rear end plate and the second reinforcing frame;

[0011] Among them, the front end plate and the rear end plate are respectively integrally formed with limiting holes, and the limiting sleeve is clamped in the limiting hole, the front end plate is fixed to the first reinforcement frame, and the rear end plate is fixed to the second reinforcement frame, so as to form a truss structure at the front end and the rear end respectively.

[0012] More preferably, the structure further comprises:

[0013] A screw hole is integrally formed through the front end plate, the rear end plate, the first reinforcement frame and the second reinforcement frame;

[0014] A fastening screw, when viewed along a direction parallel to the first surface, the fastening screw is sequentially inserted into the screw holes on the front end plate, the rear end plate, the first reinforcement frame and the second reinforcement frame;

[0015] Nuts, located at both ends of the fastening screw;

[0016] Wherein, by tightening the nut, the core is fixed between the front end and the rear end.

[0017] More preferably, the structure further comprises:

[0018] A threaded hole is integrally formed through the first reinforcement frame and the second reinforcement frame;

[0019] A connecting screw, when viewed along a direction parallel to the first surface, the connecting screw is inserted into the threaded hole and the limiting sleeve in sequence;

[0020] There is a thread in the limiting hole, and the limiting sleeve is fixed by rotating the connecting screw and screwing the connecting screw into the limiting hole.

[0021] More preferably, the front end portion further comprises:

[0022] Grooves, viewed in a direction perpendicular to the first surface, a plurality of the grooves are provided on the surface of the front end plate, and the surface is located on a side of the front end plate away from the core;

[0023] Wherein, by providing a plurality of the grooves, the surface area of ​​the front end plate is increased and the heat dissipation of the front end plate is improved.

[0024] More preferably, the core is provided with single cells, a plurality of the single cells are stacked to form the core, and the single cells are electrically connected to each other.

[0025] More preferably, the single battery comprises:

[0026] Membrane electrode;

[0027] A bipolar plate, the bipolar plate being electrically connected to the membrane electrode;

[0028] When the fuel cell is in operation, the membrane electrode transmits current to the next single cell through the bipolar plate between the single cells.

[0029] More preferably, the bipolar plate is provided with an anode plate and a cathode plate. When viewed in a direction parallel to the first surface, in one of the single cells, the anode plate is located on the side of the membrane electrode facing away from the rear end plate, and the cathode plate is located on the side of the membrane electrode facing away from the anode plate.

[0030] More preferably, when viewed in a direction parallel to the first surface, the front end plate is located on a side of the core facing away from the rear end plate, and the rear end plate is located on a side of the core facing away from the front end plate;

[0031] The core obtains the pressure generated by the fastening screws through the front end plate and the rear end plate, and the anode plate, the membrane electrode and the cathode plate in the core are in close contact, ensuring good conductivity and sealing.

[0032] More preferably, when viewed along a direction parallel to the first surface, the fastening screws are parallel to each other, and the fastening screws are perpendicular to the front end plate.

[0033] More preferably, when viewed along a direction parallel to the first surface, the front end plate and the rear end plate are parallel to each other.

[0034] The present invention has the following beneficial effects:

[0035] (1) By forming a truss structure at the front end and the rear end, the structure improves the rigidity of the front end plate and the rear end plate. By inserting the limiting sleeve into the limiting hole and installing it between the end plate and the reinforcement frame, the structure prevents the limiting sleeve from moving and deforming due to external force, and improves the stability of the front end plate and the rear end plate.

[0036] (2) By tightening the nut, pressure is generated on the fastening screw between the front end and the rear end, and the front end and the rear end clamp the core to form a whole, thereby improving the overall rigidity and stability of the fuel cell.

[0037] (3) The connecting screw is inserted into the threaded hole and the limiting sleeve in sequence, and the connecting screw is rotated to fix the limiting sleeve, so that the first reinforcing frame and the second reinforcing frame provide additional support for the front end plate and the rear end plate respectively, thereby evenly distributing the pressure generated by the fastening screw and avoiding uneven pressure distribution on the core. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the implementation methods of the present application or the technical solutions in the prior art, the drawings required for use in the implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some implementation methods of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0039] Figure 1 A schematic diagram of a three-dimensional structure of a structure described in one embodiment of the present application;

[0040] Figure 2 It is a schematic diagram of the three-dimensional structure of the rear end portion of the structure described in one embodiment of the present application;

[0041] Figure 3 It is a schematic diagram of the three-dimensional structure of the front end portion of the structure described in one embodiment of the present application;

[0042] Figure 4 This is a schematic diagram of the exploded structure of the rear end portion of the structure described in one embodiment of the present application;

[0043] Figure 5 This is a schematic diagram of the exploded structure of the core in the structure described in one embodiment of the present application;

[0044] Explanation of the accompanying drawings: 200, fuel cell; 10, core; 11, single cell; 111, membrane electrode; 112, bipolar plate; 112A, anode plate; 112B, cathode plate; 20, front end; 21, front end plate; 22, first reinforcement frame; 23, groove; 30, rear end; 31, rear end plate; 32, second reinforcement frame; 40, limiting sleeve; 50, limiting hole; 60, screw hole; 70, fastening screw; 80, nut; 90, threaded hole; 100, connecting screw; S1, first surface. DETAILED DESCRIPTION

[0045] In order to facilitate the understanding of the present application, the present application will be described more fully below with reference to the relevant drawings. The preferred embodiments of the present application are given in the drawings. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present application more thorough and comprehensive.

[0046] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0047] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0048] Please refer to Figure 1 - Figure 5 In one embodiment of the present application, a truss-type end plate structure of a fuel cell 200 is provided, and the structure includes: a core 10 , a front end portion 20 , a rear end portion 30 and a limiting sleeve 40 .

[0049] The front end portion 20 is provided with a front end plate 21 and a first reinforcement frame 22. The front end portion 20 abuts against the core 10. The surface formed by the front end plate 21 is a first surface S1. The rear end portion 30 is provided with a rear end plate 31 and a second reinforcement frame 32. The rear end portion 30 also abuts against the core 10 and is located on the side of the core 10 away from the front end portion 20. The limiting sleeve 40 is provided between the front end plate 21 and the first reinforcement frame 22, and between the rear end plate 31 and the second reinforcement frame 32. The front end plate 21 and the rear end plate 31 are respectively formed with limiting holes 50 integrally formed therein. The limiting sleeve 40 is clamped in the limiting holes 50, so that the front end plate 21 is fixed to the first reinforcement frame 22, and the rear end plate 31 is fixed to the second reinforcement frame 32, so as to form a truss structure at the front end portion 20 and the rear end portion 30, respectively.

[0050] Among them, the truss structure is a common structural form, which is widely used in the fields of construction, bridges, aviation, civil engineering, etc., because it can maintain the lightness and high rigidity of the structure while bearing heavy loads. The truss structure is characterized by a frame structure formed by a plurality of rods (limit sleeves 40) connected by nodes. In this embodiment, the reinforcement frame of the front end plate 21 and the rear end plate 31 is connected by the limit sleeve 40 to form a truss-like structure. The rigidity of the overall structure is significantly improved, which can effectively prevent the end plate from bending and deforming when subjected to external force. The limit sleeve 40 is clamped between the front end plate 21 and the rear end plate 31 through the limit hole 50, ensuring a tight connection between the core 10 and the end plate. In this way, the force can be evenly transmitted to the core 10, avoiding the problem of excessive or insufficient local force. The design of the limiting sleeve 40 and the reinforcing frame ensures that the front plate 21 and the rear plate 31 can evenly distribute the pressure when subjected to force, preventing uneven contact pressure between the bipolar plate 112 and the membrane electrode 111 inside the core 10, thereby improving the overall performance of the fuel cell 200 stack, because when the core 10 is subjected to too little pressure, a large contact resistance will be generated between the bipolar plate 112 and the membrane electrode 111, and when the core 10 is subjected to too much pressure, the internal single cell 11 will be damaged, so uneven pressure will reduce the overall performance of the fuel cell 200. The stable truss structure can not only enhance the bending resistance of the end plate, but also effectively resist the displacement or deformation of the core 10 caused by thermal expansion or mechanical vibration during operation, providing better overall stability and deformation resistance, so that the fuel cell 200 stack maintains good mechanical properties during long-term operation.

[0051] More preferably, the structure further includes: a screw hole 60 , a fastening screw 70 and a nut 80 .

[0052] The screw hole 60 is integrally formed through the front end plate 21, the rear end plate 31, the first reinforcement frame 22, and the second reinforcement frame 32. When viewed in a direction parallel to the first surface S1, the fastening screw 70 sequentially penetrates the screw hole 60 on the front end plate 21, the rear end plate 31, the first reinforcement frame 22, and the second reinforcement frame 32. The nut 80 is located at both ends of the fastening screw 70. By tightening the nut 80, the core 10 is fixed between the front end portion 20 and the rear end portion 30.

[0053] Among them, the screw hole 60 passes through the front end plate 21, the rear end plate 31, the first reinforcement frame 22 and the second reinforcement frame 32, and is connected by the screw and the nut 80 to form a strong integral connection. This connection method can provide higher connection strength and structural stability. By tightening the nut 80, the screw generates tension, pressing the front end plate 21 and the rear end plate 31 tightly against the two ends of the core 10, so that the core 10 is firmly fixed between the front end 20 and the rear end 30, avoiding displacement or loosening of the core 10 during operation. The design of multiple screws also ensures that the clamping force is more evenly distributed along the length direction of the core 10 to a certain extent. The uniform clamping force helps to ensure uniform contact pressure between the bipolar plate 112 and the membrane electrode 111 of each single cell 11 in the core 10, avoiding the problem of excessive or insufficient local force, thereby improving the overall performance of the fuel cell 200. The connection method of the screw and the nut 80 makes the assembly process simple and efficient. It is only necessary to insert the screw rod into the screw rod hole 60 of each component in turn, and then tighten the nut 80 to complete the assembly, which reduces the assembly time and cost. This connection method is also convenient for later disassembly and maintenance. When the core 10 or other components need to be inspected or replaced, it is only necessary to loosen the nut 80 to easily disassemble the entire structure for maintenance and repair. After the installation is completed, the front end plate 21, the rear end plate 31, the first reinforcement frame 22 and the second reinforcement frame 32 are connected by the screw rod and the nut 80 to form a larger, integrated truss structure. This structure has a high rigidity when subjected to force, and can effectively resist deformation caused by external forces to maintain the stability of the fuel cell 200 structure, and in a vibration or impact environment, this structure can better maintain shape and stability, reducing damage to the core 10 and other components.

[0054] More preferably, the structure further includes: a threaded hole 90 and a connecting screw 100 .

[0055] The threaded hole 90 is integrally formed through the first reinforcing frame 22 and the second reinforcing frame 32. When viewed in a direction parallel to the first surface S1, the connecting screw 100 is sequentially inserted into the threaded hole 90 and the limiting sleeve 40. The limiting hole 50 has a thread therein, and by rotating the connecting screw 100 and screwing the connecting screw 100 into the limiting hole 50, the limiting sleeve 40 is fixed.

[0056] Among them, the internal thread of the threaded hole 90 and the internal thread of the limiting hole 50 are matched with the external thread of the connecting screw 100. When the connecting screw 100 is screwed into the threaded hole 90 and the limiting hole 50 respectively, the installation is completed. Through the cooperation of the threaded hole 90 and the limiting hole 50, the precise alignment of the connecting screw 100 and the limiting sleeve 40 can be ensured. The design that the threaded hole 90 is integrated into the reinforcing frame and the limiting sleeve 40 can accurately locate each component and ensure that they will not be misaligned during the assembly process. The threads in the threaded hole 90 and the limiting hole 50 can make the connecting screw 100 generate a strong friction force when screwed in, thereby forming a stable connection, preventing loosening, and improving the stability of the entire structure. By forming the threaded hole 90 through the first reinforcing frame 22 and the second reinforcing frame 32, and connecting them tightly with the limiting sleeve 40 through the connecting screw 100, the rigidity of the entire truss structure can be significantly improved. The threaded connection provides a reliable fixation to ensure that the reinforcing frame will not deform when subjected to force. And this design can effectively disperse the forces of each part, avoid a certain part from being subjected to excessive concentrated stress, thereby improving the compressive resistance and stability of the entire structure. The design of the threaded hole 90 and the connecting screw 100 makes the assembly process simple and convenient. The assembly can be completed by simply screwing the connecting screw 100 into the threaded hole 90 and the limiting hole 50, without the need for additional complex processes, saving time and labor costs. When the fuel cell 200 needs to be maintained or parts replaced, the limiting sleeve 40 and the reinforcing frame can be disassembled by simply unscrewing the connecting screw 100, which is convenient for disassembly and maintenance. The threaded connection can provide a continuous pre-tightening force to prevent the connecting screw 100 from loosening due to vibration or other external forces during long-term use, thereby ensuring the firmness and durability of the connection. In addition, the threaded connection can maintain a good connection effect after multiple disassembly and assembly.

[0057] Preferably, the front end portion 20 further includes: grooves 23. When viewed in a direction perpendicular to the first surface S1, a plurality of the grooves 23 are provided on the surface of the front end plate 21, and the surface is located on the side of the front end plate 21 away from the core 10. By providing a plurality of the grooves 23, the surface area of ​​the front end plate 21 is increased, and the heat dissipation of the front end plate 21 is improved.

[0058] Among them, the presence of the groove 23 can significantly increase the surface area of ​​the front end plate 21. According to the principles of heat conduction and heat radiation, the heat dissipation effect is directly related to the surface area. The larger the surface area, the stronger the heat dissipation capacity. Increasing the surface area of ​​the front end plate 21 can accelerate the heat dissipation, thereby effectively reducing the operating temperature of the front end plate 21 and the fuel cell 200 core 10. By setting the groove 23, the front end plate 21 can dissipate heat more effectively during operation, reducing the accumulation of heat in the end plate and the core 10. This is crucial to the thermal management of the fuel cell 200, helping to maintain the battery operating within a suitable temperature range and improve the performance and life of the battery. In addition, the groove 23 can also guide the airflow to form a good heat dissipation channel through the surface of the front end plate 21, further enhancing the heat dissipation effect: the optimized airflow channel can ensure that the heat is quickly taken away and improve the heat dissipation efficiency. Efficient heat dissipation can prevent the end plate and the core 10 from being degraded or damaged due to overheating, thereby improving the safety and reliability of the fuel cell 200. Providing a groove 23 on the front end plate 21 can also reduce the amount of material used, thereby reducing the weight of the front end plate 21. Although the groove 23 increases the surface area, it does not significantly increase the weight of the board, but may reduce the overall weight without affecting the structural strength. This is very beneficial to improving the overall energy efficiency and portability of the fuel cell 200. The groove 23 design also helps to increase the structural rigidity of the front end plate 21. The groove 23 can form a structure similar to a "rib", which can better disperse stress when subjected to external force, thereby improving the deformation resistance of the front end plate 21 and preventing deformation during operation.

[0059] More preferably, the core 10 is provided with single cells 11 , and a plurality of the single cells 11 are stacked to form the core 10 , and the single cells 11 are electrically connected to each other.

[0060] Among them, each single cell 11 is connected in series in the core 10, and its voltage output is superimposed. This means that the total voltage of the core 10 is equal to the sum of the voltages of all the single cells 11, thereby significantly improving the voltage output level of the fuel cell 200. By increasing the number of single cells 11, not only the voltage is improved, but the total power output of the core 10 is also increased accordingly, thereby meeting the needs of higher power equipment. The core 10 is designed to be stacked with multiple single cells 11, making the design of the fuel cell 200 more modular and flexible. According to actual use requirements, the number of single cells 11 can be adjusted to meet different voltage and power requirements, facilitating the functional customization and expansion of the fuel cell 200. The modular design makes the maintenance and replacement of individual cells more convenient. If a single cell 11 has a problem, the single cell 11 can be replaced separately without replacing the entire core 10, thereby reducing maintenance costs and time. In the core 10, the current of multiple single cells 11 is evenly distributed, avoiding a single cell from being subjected to excessive current load, thereby reducing the risk of overheating and damage. The stacking of single cells 11 to form the core 10 makes the design of the fuel cell 200 more compact and space-saving, and is suitable for use in various scenarios with limited space, such as automobiles, portable devices, etc. The stacking structure also makes the assembly of the core 10 simpler, as the single cells 11 only need to be stacked and electrically connected in sequence, which reduces the assembly steps and complexity.

[0061] More preferably, the single cell 11 includes: a membrane electrode 111 and a bipolar plate 112 .

[0062] The bipolar plate 112 is electrically connected to the membrane electrode 111. When the fuel cell 200 is in operation, the membrane electrode 111 transmits current to the next unit cell 11 through the bipolar plate 112 between the unit cells 11.

[0063] Among them, the main function of the bipolar plate 112 is to efficiently transfer the current generated by one single cell 11 to the next single cell 11. Through the direct electrical connection between the bipolar plate 112 and the membrane electrode 111, the current can be transmitted quickly and without loss, ensuring the efficient operation of the fuel cell 200 core 10 as a whole. The bipolar plate 112 can evenly distribute the current, ensure that the electrochemical reaction in each single cell 11 is carried out evenly, and optimize the working efficiency and performance of the fuel cell 200. Since the bipolar plate 112 provides a stable electrical connection between each single cell 11, the entire core 10 can achieve a stable voltage output, reducing the impact of voltage fluctuations on the operation of the equipment. The bipolar plate 112 not only plays the role of electrical connection, but also can serve as a structural support for the core 10, enhance the mechanical strength of the entire core 10, and prevent the membrane electrode 111 from being damaged by excessive pressure during operation. The bipolar plate 112 is usually made of a material with good thermal conductivity, which can effectively conduct and dissipate heat, avoid overheating of the single cell 11, and keep the fuel cell 200 working within a suitable temperature range. In addition, the bipolar plate 112 can also separate gases, prevent the fuel and oxidant from mixing between different cells 11, and improve the working efficiency and safety of the battery. Directly connecting the membrane electrode 111 with the bipolar plate 112 can reduce the resistance at the connection, reduce energy loss, and improve the overall efficiency of the battery.

[0064] More preferably, the bipolar plate 112 is provided with an anode plate 112A and a cathode plate 112B, and when observed in a direction parallel to the first surface S1, in one of the single cells 11, the anode plate 112A is located on the side of the membrane electrode 111 away from the rear end plate 31, and the cathode plate 112B is located on the side of the membrane electrode 111 away from the anode plate 112A.

[0065] Among them, the anode plate 112A and the cathode plate 112B are respectively located on both sides of the membrane electrode 111, which can effectively separate the areas of hydrogen oxidation and oxygen reduction reactions. This layout can ensure that the reactants react fully in their respective areas and improve the electrochemical reaction efficiency of the fuel cell 200. By arranging the anode plate 112A and the cathode plate 112B on both sides of the membrane electrode 111, direct interference between the two electrodes can be avoided, ensuring the stable progress of the electrochemical reaction, and reducing the electric field interference between the electrodes, thereby improving the overall performance of the battery. The membrane electrode 111 is electrically connected through the bipolar plate 112, which can ensure that the current is smoothly transmitted from one single cell 11 to the next single cell 11, so as to reduce resistance loss and improve the conductivity of the fuel cell 200.

[0066] More preferably, when viewed in a direction parallel to the first surface S1, the front end plate 21 is located on the side of the core 10 away from the rear end plate 31, and the rear end plate 31 is located on the side of the core 10 away from the front end plate 21. The core 10 obtains the pressure generated by the fastening screws 70 through the front end plate 21 and the rear end plate 31, and the anode plate 112A, the membrane electrode 111, and the cathode plate 112B in the core 10 are in close contact, ensuring good conductivity and sealing.

[0067] Among them, by applying pressure through the fastening screw 70 between the front end plate 21 and the rear end plate 31, close contact between the anode plate 112A, the membrane electrode 111 and the cathode plate 112B in the core 10 can be ensured. This uniform pressure distribution can reduce contact resistance, ensure that current can be efficiently conducted, and improve the overall conductivity of the fuel cell 200. Close contact not only helps conduction, but also improves sealing and prevents leakage of fuel (such as hydrogen) and oxidants (such as oxygen) inside the core 10, which is crucial to the safety and efficiency of the fuel cell 200, because leakage can lead to energy loss and potential safety hazards.

[0068] More preferably, when viewed along a direction parallel to the first surface S1 , the fastening screws 70 are parallel to each other, and the fastening screws 70 are perpendicular to the front end plate 21 .

[0069] Among them, when the tightening screws 70 are parallel and perpendicular to the front end plate 21, the applied force can be evenly distributed on the front end plate 21 and the core 10, avoiding the problem of excessive or too small local pressure. This can ensure that the entire structure remains balanced under pressure and reduce the risk of deformation. The parallel and vertically arranged screws can increase the stability of the entire fuel cell 200 stack. The parallelism between the screws ensures the stability of the structure when subjected to external forces, and the vertical force transmission can also more effectively maintain the overall rigidity. The parallel and vertical arrangement of the screws can also simplify the alignment steps during the assembly process. During assembly, ensure that the screws can accurately pass through the screw holes of each component to improve assembly efficiency. The screws perpendicular to the front end plate 21 can effectively transmit vertical pressure and enhance the rigidity of the entire structure. The parallel arranged screws can ensure that the forces in different directions are evenly distributed, avoiding distortion and deformation caused by asymmetric force. This arrangement can maximize the use of the tension of the screws and the resistance of the front end plate 21 to form a high-strength connection system.

[0070] More preferably, when viewed along a direction parallel to the first surface S1 , the front end plate 21 and the rear end plate 31 are parallel to each other.

[0071] Among them, when the front end plate 21 and the rear end plate 31 are parallel to each other, each single cell 11 and assembly inside the core 10 can be evenly stressed. This uniform stress mode can avoid local stress concentration, thereby reducing deformation and damage caused by uneven stress. The parallel front end plate 21 and the rear end plate 31 form a symmetrical structure, which helps to improve the stability of the overall fuel cell 200 stack. Symmetry ensures that the structure can maintain balance and will not tilt or bend when subjected to external forces or internal pressure changes.

[0072] Thus, the present invention forms a truss structure at the front end portion 20 and the rear end portion 30, so that the structure improves the rigidity of the front end plate 21 and the rear end plate 31. By inserting the limiting sleeve 40 into the limiting hole 50 and installing it between the end plate and the reinforcing frame, the structure prevents the limiting sleeve 40 from moving and deforming due to external force, and improves the stability of the front end plate 21 and the rear end plate 31. By tightening the nut 80, the fastening screw 70 between the front end portion 20 and the rear end portion 30 generates pressure, and the front end portion 20 and the rear end portion 30 clamp the core 10 to form a whole, thereby improving the overall rigidity and stability of the fuel cell 200. The connecting screw 100 is inserted into the threaded hole 90 and the limit sleeve 40 in sequence, and the connecting screw 100 is rotated to fix the limit sleeve 40, so that the first reinforcement frame 22 and the second reinforcement frame 32 provide additional support for the front end plate 21 and the rear end plate 31 respectively, thereby evenly distributing the pressure generated by the fastening screw 70 and avoiding uneven pressure distribution on the core 10.

[0073] The above-mentioned embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present application. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application.

Claims

1. A fuel cell truss end plate structure, It is characterized in that The structure comprises: Core; A front end portion is provided with a front end plate and a first reinforcement frame, the front end portion is in contact with the core, and a surface formed by the front end plate is a first surface; A rear end portion is provided with a rear end plate and a second reinforcement frame, the rear end portion also abuts against the core and is located on a side of the core away from the front end portion; A limiting sleeve, arranged between the front end plate and the first reinforcing frame, and between the rear end plate and the second reinforcing frame; Among them, the front end plate and the rear end plate are respectively integrally formed with limiting holes, and the limiting sleeve is clamped in the limiting hole, the front end plate is fixed to the first reinforcement frame, and the rear end plate is fixed to the second reinforcement frame, so as to form a truss structure at the front end and the rear end respectively.

2. A fuel cell truss end plate structure according to claim 1, It is characterized in that The structure also includes: A screw hole is integrally formed through the front end plate, the rear end plate, the first reinforcement frame and the second reinforcement frame; A fastening screw, when viewed along a direction parallel to the first surface, the fastening screw is sequentially inserted into the screw holes on the front end plate, the rear end plate, the first reinforcement frame and the second reinforcement frame; Nuts, located at both ends of the fastening screw; Wherein, by tightening the nut, the core is fixed between the front end and the rear end.

3. A fuel cell truss end plate structure according to claim 1, It is characterized in that The structure also includes: A threaded hole is integrally formed through the first reinforcement frame and the second reinforcement frame; A connecting screw, when viewed along a direction parallel to the first surface, the connecting screw is inserted into the threaded hole and the limiting sleeve in sequence; There is a thread in the limiting hole, and the limiting sleeve is fixed by rotating the connecting screw and screwing the connecting screw into the limiting hole.

4. A fuel cell truss end plate structure according to claim 1, It is characterized in that The front end portion further comprises: Grooves, viewed in a direction perpendicular to the first surface, a plurality of the grooves are provided on the surface of the front end plate, and the surface is located on a side of the front end plate away from the core; Wherein, by providing a plurality of the grooves, the surface area of ​​the front end plate is increased and the heat dissipation of the front end plate is improved.

5. A fuel cell truss end plate structure according to claim 2, It is characterized in that The core is provided with single cells, and a plurality of the single cells are stacked to form the core, and the single cells are electrically connected to each other.

6. A fuel cell truss end plate structure according to claim 5, It is characterized in that The single battery comprises: Membrane electrode; A bipolar plate, the bipolar plate being electrically connected to the membrane electrode; When the fuel cell is in operation, the membrane electrode transmits current to the next single cell through the bipolar plate between the single cells.

7. A fuel cell truss end plate structure according to claim 6, It is characterized in that The bipolar plate is provided with an anode plate and a cathode plate. When viewed in a direction parallel to the first surface, in one of the single cells, the anode plate is located on the side of the membrane electrode facing away from the rear end plate, and the cathode plate is located on the side of the membrane electrode facing away from the anode plate.

8. A fuel cell truss end plate structure according to claim 7, It is characterized in that Observed along a direction parallel to the first surface, the front end plate is located on a side of the core facing away from the rear end plate, and the rear end plate is located on a side of the core facing away from the front end plate; The core obtains the pressure generated by the fastening screws through the front end plate and the rear end plate, and the anode plate, the membrane electrode and the cathode plate in the core are in close contact, ensuring good conductivity and sealing.

9. A fuel cell truss end plate structure according to claim 2, It is characterized in that When viewed along a direction parallel to the first surface, the fastening screws are parallel to each other, and the fastening screws are perpendicular to the front end plate.

10. A fuel cell truss end plate structure according to claim 1, It is characterized in that When viewed along a direction parallel to the first surface, the front end plate and the rear end plate are parallel to each other.

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