A hydrogen fuel cell stack for drones with leak-proof components

Abstract

The present invention relates to the technical field of hydrogen fuel cell groups, and specifically to a hydrogen fuel cell group for drones with anti-leakage components, including stacked hydrogen fuel cell plates and a leakage detection device. The leakage detection device includes a leakage monitoring device, and a guiding structure is provided at each stacked gap. The opening on one side of the guide tube strip covers the gap to form a drainage airway, which is connected to the leakage monitoring device; an adhesive layer and a sealing strip are provided on the fitting edge of the guide tube strip, and a clamping and fixing mechanism is provided at the connection, including a plug-in connector and a fixed clamping connector. The leakage monitoring device includes a collecting pipe connected to the air outlet of the clamping connector, with a sealing device and a detection sensor provided inside. A fitting limiting mechanism is provided on the outside, including a fixed mounting frame, an assembly fixing layer and a dustproof filter layer. The assembly fixing layer is composed of a pressing and assembly wrapping frame, which is fixed by bolts and clamping shafts. The present invention can guide the leaked hydrogen to the monitoring device, give an alarm in time and close the pipeline to avoid diffusion while ensuring heat dissipation, thereby improving safety and stability.

Description

Technical Field

[0001] The present invention relates to the technical field of hydrogen fuel cell stacks, and more specifically to a hydrogen fuel cell stack for drones with a leak-proof assembly. Background Art

[0002] Hydrogen fuel cell packs for drones are being rapidly applied in logistics and transportation, emergency rescue, inspection and monitoring, etc. due to their advantages of high energy density, fast refueling, zero emissions and wide temperature range adaptability, and are gradually expanding into the military and consumer markets.

[0003] Chinese patent number CN214956977U discloses a hydrogen leak alarm device for a hydrogen fuel cell stack for industrial drones. The device comprises a hydrogen fuel cell stack and a housing mounted externally to the stack. The housing has a cylindrical body mounted on its bottom surface, a sealed bearing mounted in the center of the bottom surface, and a shaft mounted within the inner ring of the sealed bearing. A first fan is mounted at the lower end of the shaft, and a second fan is mounted at the upper end of the shaft. An annular shell is mounted externally to the cylindrical body, with multiple air outlets formed on the outer wall of the cylindrical body and an air outlet pipe mounted on the outer ring of the annular shell. A fixing plate is mounted on the bottom surface of the housing, and a hydrogen sensor is mounted on the fixing plate. This device features a simple structure. The rotating second fan absorbs gas from the housing, discharging it centrally through the annular shell and the air outlet pipe. The discharged gas directly contacts the hydrogen sensor, ensuring comprehensive gas contact and preventing missed gas leaks. Furthermore, the flowing gas improves heat dissipation from the hydrogen fuel cell stack.

[0004] While the aforementioned device can guide leaked hydrogen gas to the alarm via the housing, and thus achieve detection and alarm, it can only issue an alarm signal when detecting a hydrogen leak in the hydrogen fuel cell stack during flight, without any emergency response measures. Hydrogen is a flammable and explosive gas. Sustained leakage not only causes the hydrogen fuel cell stack to malfunction due to insufficient hydrogen supply, severely impacting the drone's flight performance and mission execution capabilities, but can also, under certain conditions, cause serious safety incidents such as explosions, posing a significant threat to the drone itself, the surrounding environment, and personnel. Furthermore, while the housing completely covers the exterior of the hydrogen fuel cell stack, providing a relatively closed environment for hydrogen leak detection, it also significantly hinders heat exchange between the fuel cell stack and the external environment. The hydrogen fuel cell stack generates significant heat during operation. If heat cannot be dissipated promptly and effectively, the internal temperature of the stack can overheat, compromising battery performance, lifespan, and safety. High temperatures can cause chemical imbalances within the battery, accelerating battery aging and even leading to dangerous conditions such as thermal runaway, seriously impacting the drone's stable operation. Summary of the Invention

[0005] In response to the above problems, a hydrogen fuel cell pack for drones with a leak-proof component is provided, which can effectively improve the safety and stability of use through a leak detection device and a guide pipe.

[0006] In order to solve the problems of the prior art, the present invention provides a hydrogen fuel cell group for drones with a leak-proof component, including stacked hydrogen fuel cell plates and a leak detection device, the leak detection device including a leak monitoring device for detecting leaked hydrogen, and each gap in the stack is independently provided with a guide structure for guiding the hydrogen leaked in the gap to the leak monitoring device, the guide structure including a guide tube strip, one side of the guide tube strip is open and covers the gap to form a drainage air duct, the drainage air duct has an outlet end connected to the leakage monitoring device; the fitting edge of the guide tube strip is provided with an adhesive layer and a sealing strip, and the connection of the guide tube strip is provided with a clamping and fixing mechanism for easy installation; the clamping and fixing mechanism includes a plug-in connector installed at one end of the guide tube strip, the plug-in connector is provided with a limiting clamping hole, the end of the guide tube strip away from the plug-in connector is provided with a fixed clamping connector, the fixed clamping connector is provided with a docking slot, and the docking slot is provided with a movable clamping plate, the movable clamping plate is used to clamp and fix the plug-in connector The head has a plurality of first air outlets on the fixed card joint; the leakage monitoring device includes a collecting pipe connected to the first air outlet, a closing device is provided inside the collecting pipe, a second air outlet is provided at the bottom of the collecting pipe, and a sensor for detecting leaked gas is installed on the second air outlet; the closing device includes a closed adjustment tube installed at the axial center position of the collecting pipe, and a plurality of communicating holes are provided on the outer side of the closed adjustment tube, and the communicating holes correspond one-to-one to the first air outlet, and the closing device also includes a rotary driver for driving the closed adjustment tube to rotate and adjust; the assembly fixing layer is composed of a plurality of pressing parcel racks and a plurality of assembling parcel racks, the bottom of the pressing parcel rack is provided with a supporting bolt, the top of the pressing parcel rack is provided with a limited clamping shaft, the splicing ends of the pressing parcel rack are provided with inclined clamping grooves, the splicing ends of the assembling parcel racks are provided with inclined plug-in blocks, and the inner walls of the pressing parcel rack and the assembling parcel rack are provided with a plurality of pressing channels; the interior of the anti-rotation mounting groove is provided with a rubber contact layer, and the interior of the rubber contact layer is provided with an anti-slip strip.

[0007] Preferably, a hydrogen fuel cell pack for an unmanned aerial vehicle with a leakage-proof component further includes a fitting and limiting mechanism installed on the outside of the hydrogen fuel cell pack, the fitting and limiting mechanism includes a fixed mounting frame fixedly installed on the outside of the hydrogen fuel cell pack, an assembling and fixing layer is installed on the fixed mounting frame, the inner wall of the assembling and fixing layer is in conflict with the guide pipe strip, and a detachable dust-proof filter layer is provided on the outside of the assembling and fixing layer.

[0008] Preferably, the fixed mounting frame includes a mounting base plate installed at the bottom of the hydrogen fuel cell group, the mounting base plate is provided with a plurality of anti-rotation mounting grooves for fixing support bolts, the fixed mounting frame also includes a mounting top plate installed at the top of the hydrogen fuel cell group, the mounting top plate is provided with a plurality of clamping mechanisms for fixing limiting clamping shafts, and limiting grooves are provided on both the mounting base plate and the mounting top plate.

[0009] Preferably, the clamping mechanism includes a limiting clamping groove arranged on the side of the mounting top plate, and a pressing clamping joint is slidably installed on the side of each limiting clamping groove, an inclined clamping surface is installed on the pressing clamping joint, and a second spring is installed between the pressing clamping joint and the mounting top plate.

[0010] Compared with the prior art, the present invention has the following advantages:

[0011] 1. A guide structure is installed in the gaps between the stacked hydrogen fuel cell panels, connecting the drainage airway to the leak monitoring device. When a hydrogen leak is detected, the leak monitoring device not only promptly issues an alarm signal but also rapidly seals the hydrogen pipeline, trapping the leaked hydrogen in the guide tube. This emergency response mechanism effectively prevents hydrogen diffusion and leakage, ensuring that the hydrogen fuel cell stack continues to operate for a certain period of time, providing sufficient return time for the drone. This significantly reduces the risk of serious safety accidents such as explosions caused by continuous hydrogen leakage, greatly improving the safety of the drone during flight and ensuring the safety of the drone itself, the surrounding environment, and personnel.

[0012] 2. Gaps are left between the guide tubes to prevent the guide structure from completely obscuring the outer wall of the hydrogen fuel cell, ensuring that the outside air has sufficient contact with the surface of the hydrogen fuel cell. During the operation of the hydrogen fuel cell stack, the large amount of heat generated by it can be effectively exchanged with the external environment through these gaps and dissipated promptly. This design effectively prevents the internal temperature of the battery pack from overheating, avoiding dangerous situations such as imbalanced chemical reactions within the battery, accelerated battery aging, and thermal runaway caused by high temperatures. This ensures the stable performance, extended lifespan, and safe operation of the hydrogen fuel cell stack, thereby ensuring the stable operation of the drone.

[0013] 3. The leak monitoring device's emergency response function enables the hydrogen fuel cell stack to maintain normal operation for a certain period of time in the event of a hydrogen leak, preventing the stack from malfunctioning due to insufficient hydrogen supply. This feature ensures that the drone maintains stable flight performance during flight, especially in the event of a sudden hydrogen leak, ensuring that mission execution is not significantly affected, and improving the drone's reliability and adaptability in complex environments. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a three-dimensional schematic diagram of a hydrogen fuel cell stack.

[0015] Figure 2 This is a three-dimensional schematic diagram of the installation status of a guide tube and a leakage monitoring device in a hydrogen fuel cell pack for an unmanned aerial vehicle with an anti-leakage component applied for by the present invention.

[0016] Figure 3This is a schematic diagram of the bonding state of the guide tube and the hydrogen fuel cell plate in a hydrogen fuel cell pack for an unmanned aerial vehicle with an anti-leakage component applied for by the present invention.

[0017] Figure 4 This is a three-dimensional schematic diagram of a guide tube and a leakage monitoring device in a hydrogen fuel cell pack for a drone with an anti-leakage component applied for by the present invention.

[0018] Figure 5 This is a three-dimensional schematic diagram of a guide tube in a hydrogen fuel cell pack for a drone with a leak-proof component applied for by the present invention.

[0019] Figure 6 It is a three-dimensional schematic diagram of a clamping and fixing mechanism and a leakage monitoring device in a hydrogen fuel cell pack for a drone with an anti-leakage component applied for by the present invention.

[0020] Figure 7 This is a front view of a leakage monitoring device in a hydrogen fuel cell pack for a drone with an anti-leakage component applied for by the present invention.

[0021] Figure 8 yes Figure 7 Plane sectional view at section AA.

[0022] Figure 9 This is a schematic diagram of the installation state of the fitting limit mechanism and the guide pipe strip in a hydrogen fuel cell pack for drones with an anti-leakage component applied for by the present invention.

[0023] Figure 10 yes Figure 9 A partial enlarged view of point B in the middle.

[0024] Figure 11 yes Figure 9 A partial enlarged view of point C in the middle.

[0025] Figure 12 This is an exploded view of a fitting limit mechanism in a hydrogen fuel cell pack for a drone with a leak-proof component applied for by the present invention.

[0026] Figure 13 yes Figure 12 A partial enlarged view of point D in the middle.

[0027] The numbers in the figure are:

[0028] 1. Hydrogen fuel cell stack; 11. Hydrogen fuel cell board; 2. Guide tube strip; 21. Adhesive layer; 22. Sealing strip; 23. Drainage air duct; 24. Snap-fit fixing mechanism; 25. Plug-in connector; 251. Limiting card hole; 26. Fixed card connector; 261. Docking card slot; 262. Movable card plate; 263. First spring; 264. First air outlet; 3. Leakage monitoring device; 31. Collecting pipe; 32. Closing device; 321. Closed regulating pipe; 3211. Connecting hole; 322. Rotary drive; 33. Sensor; 34. Second air outlet; 41. Assembling fixed layer; 411, pressing parcel rack; 4111, supporting bolt; 4112, limiting snap-fitting shaft; 4113, tilting snap-fitting groove; 412, assembling parcel rack; 4121, tilting plug-in block; 414, pressing channel; 42, dust-proof filter layer; 43, fixed mounting frame; 431, installing bottom plate; 4311, anti-rotation mounting groove; 4312, rubber contact layer; 432, installing top plate; 4321, snap-fitting mechanism; 4322, limiting snap-fitting groove; 4323, pressing snap-fitting joint; 4324, tilting snap-fitting surface; 4325, second spring; 433, connecting screw. DETAILED DESCRIPTION

[0029] In order to further understand the features, technical means, and specific objectives and functions achieved by the present invention, the present invention is further described in detail below with reference to the accompanying drawings and specific implementation methods.

[0030] See also Figures 1 to 13 As shown, a hydrogen fuel cell stack for a drone with a leak-proof component includes a stacked hydrogen fuel cell plate 11 and a leak detection device. The leak detection device includes a leak monitoring device 3 for detecting leaked hydrogen. Each gap in the stack is independently provided with a guide structure for guiding the hydrogen leaked in the gap to the leak monitoring device 3. The guide structure includes a guide tube strip 2. One side of the guide tube strip 2 is open and covers the gap to form a drainage air duct 23. The drainage air duct 23 has an outlet end connected to the leakage monitoring device 3.

[0031] After the hydrogen fuel cell plates 11 are produced, several guide strips 2 in the guide structure are placed over each gap in the stack. Gaps are left between each guide strip 2 to prevent the guide structure from completely obscuring the outer walls of the hydrogen fuel cell, ensuring that external air can reach the surface of the hydrogen fuel cell, facilitating heat dissipation. The gaps between each hydrogen fuel cell plate 11 are connected to the drainage air ducts 23 of the corresponding guide strip 2, and the guide strips 2 are sealed against the sides of the hydrogen fuel cell plates 11.

[0032] During the long-term use of the hydrogen fuel cell board 11, hydrogen leakage may occur in the gaps between the hydrogen fuel cell boards 11 due to the aging of the sealing layer. Once hydrogen leaks from the gaps, the hydrogen will directly enter the drainage airway 23. The drainage airway 23 can effectively prevent the direct leakage of the airflow, and the leaked hydrogen will flow into the leakage monitoring device 3 along the drainage airway 23. After the leakage monitoring device 3 identifies the hydrogen leak, it will issue an alarm signal to alert the operator. At the same time, the leakage monitoring device 3 will close the pipeline for circulating hydrogen to prevent further leakage of hydrogen and allow the leaked hydrogen to remain in the corresponding guide tube 2. The flow-blocking effect of the guide tube 2 can effectively prevent hydrogen diffusion leakage and realize the emergency treatment function. This emergency treatment mechanism can ensure that the hydrogen fuel cell stack 1 can continue to work within a certain period of time, providing sufficient return time for the drone.

[0033] See also Figures 1 to 13 As shown, the joining edge of the guide tube strip 2 is provided with an adhesive layer 21 and a sealing strip 22 , and the connection of the guide tube strip 2 is provided with a clamping fixing mechanism 24 for easy installation.

[0034] The fitting edge of the guide tube strip 2 is provided with an adhesive layer 21 and a sealing strip 22, and the connection of the guide tube strip 2 is provided with a snap-on fixing mechanism 24 for easy installation. When installing the guide tube strip 2, the outer surface of the hydrogen fuel cell stack 1 must first be cleaned to remove dust, impurities, etc. on the surface, to ensure a clean installation surface, and to guarantee adhesion and sealing performance. After the cleaning process is completed, the adhesive layer 21 of the guide tube strip 2 is brought into contact with the outer surface of the hydrogen fuel cell stack 1. The adhesive layer 21 has good viscosity and can firmly fix the guide tube strip 2 on the hydrogen fuel cell stack 1. While the adhesive layer 21 is fixed, the sealing strip 22 on the guide tube strip 2 will tightly contact the surface of the hydrogen fuel cell stack 1. The sealing strip 22 is elastic and sealing, and can effectively fill the small gap between the guide tube strip 2 and the hydrogen fuel cell stack 1, ensuring a sealing effect and preventing hydrogen from leaking from the installation gap.

[0035] Through this installation method, the guide tube strips 2 can tightly wrap the stacking gaps on the outer surface of the hydrogen fuel cell stack 1. Subsequently, the front and rear ends of the guide tube strips 2 are connected and fixed using a clamping and fixing mechanism 24, ensuring that the guide tube strips 2 stably and tightly wrap the stacking gaps, forming a relatively closed drainage channel 23, laying the foundation for subsequent hydrogen leak guidance and emergency response.

[0036] See also Figures 1 to 6As shown, the clamping and fixing mechanism 24 includes a plug-in connector 25 installed at one end of the guide tube strip 2, and a limit clamping hole 251 is provided on the plug-in connector 25. A fixed clamping connector 26 is installed on the end of the guide tube strip 2 away from the plug-in connector 25, and a docking slot 261 is provided on the fixed clamping connector 26. A movable clamping plate 262 is installed on the docking slot 261. The movable clamping plate 262 is used to clamp and fix the plug-in connector 25. The fixed clamping connector 26 is provided with a plurality of first air outlets 264.

[0037] The movable clamping plate 262 is slidably connected to the fixed clamping joint 26 . A limit clamping shaft is provided on the movable clamping plate 262 . The limit clamping shaft is used to insert into the docking limit clamping hole 251 . A first spring 263 is installed between the movable clamping plate 262 and the fixed clamping joint 26 .

[0038] When installing the guide tube strip 2, the operator first fits the fixed connector 26 against the designated location on the outer wall of the hydrogen fuel cell stack 1, providing basic support for the guide tube strip 2. The operator then wraps the guide tube strip 2 around the outside of the hydrogen fuel cell stack 1, ensuring that it covers the gaps between the stacked hydrogen fuel cell plates 11. Finally, the plug connector 25 at the front end of the guide tube strip 2 is inserted into the docking slot 261 of the fixed connector 26. During the insertion process, the plug connector 25 compresses the movable clamping plate 262, forcing it to slide against the elastic force of the first spring 263, creating space for the plug connector 25 to be inserted. When the plug-in connector 25 is inserted into the appropriate position, at this time, under the elastic force of the first spring 263, the movable clamping plate 262 will be pressed down and moved, so that the limiting clamping shaft on the movable clamping plate 262 is inserted into the limiting clamping hole 251, thereby realizing the mutual connection and fixation of the front and rear ends of the guide tube strip 2, ensuring that the guide tube strip 2 stably and tightly wraps the stacked gaps of the hydrogen fuel cell stack 1, forming a relatively closed drainage airway 23.

[0039] During the long-term use of the hydrogen fuel cell plate 11, if hydrogen leakage occurs in the gaps between the hydrogen fuel cell plates 11 due to aging of the sealing layer, the drainage air channel 23 formed by the guide tube strip 2 begins to play a role. The leaked hydrogen will flow along the drainage air channel 23 and be discharged through the first air outlet 264 on the fixed clamping joint 26. The leakage monitoring device 3 is connected to the first air outlet 264 and can receive the leaked gas through the first air outlet 264. When the leakage monitoring device 3 identifies a hydrogen leak, it will immediately issue an alarm signal to prompt the operator to take timely measures. The clamping fixing mechanism 24 is fixed through a stable connection, ensuring the reliable installation of the guide tube strip 2 on the hydrogen fuel cell stack 1 and ensuring the integrity and sealing of the drainage air channel 23.

[0040] See also Figures 2 to 6As shown, the leakage monitoring device 3 includes a collecting pipe 31 connected to the first air outlet 264, a closing device 32 is provided inside the collecting pipe 31, a second air outlet 34 is provided at the bottom of the collecting pipe 31, and a sensor 33 for detecting leaked gas is installed on the second air outlet 34.

[0041] The hydrogen detection device includes a manifold 31 connected to the first gas outlet 264 on the fixed connector 26. During normal operation of the hydrogen fuel cell stack 1, if hydrogen leaks from the stacking gaps of the hydrogen fuel cell plates 11, the drainage channels 23 formed by the guide tube strips 2 guide the leaked hydrogen to each of the first gas outlets 264. Because the manifold 31 is connected to the first gas outlets 264, leaked hydrogen flows from the multiple first gas outlets 264 into the manifold 31, effectively collecting the hydrogen. The manifold 31 provides a closed and stable channel for hydrogen collection and subsequent detection, ensuring that the leaked hydrogen reaches the detection area. After hydrogen flows from the first gas outlet 264 into the manifold 31, it further flows to the second gas outlet 34 at the bottom of the manifold 31. The sensor 33 has a highly sensitive hydrogen detection function and can monitor the gas composition at the second gas outlet 34 in real time. Once the sensor 33 detects the presence of hydrogen, it can be determined that a hydrogen leak has occurred in the hydrogen fuel cell stack 1. The sensor 33 detects and analyzes the hydrogen concentration or specific chemical properties in the gas through built-in detection elements. When the detected hydrogen-related parameters exceed the preset safety threshold, the sensor 33 will quickly identify hydrogen leakage.

[0042] When the sensor 33 detects a hydrogen leak, it will immediately trigger a series of emergency treatment measures. First, the sensor 33 will activate the remote alarm function and send an alarm signal to the operator through the wireless communication module or other signal transmission methods, promptly reminding the staff that there is a hydrogen leakage problem in the hydrogen fuel cell stack 1, so that the staff can quickly take corresponding treatment measures, such as arranging the drone to return, troubleshooting and repairing, etc. At the same time, the sensor 33 will also activate the closing device 32 inside the collecting pipe 31. The closing device 32 is capable of closing the collecting pipe 31. The closing device 32 can prevent the leaked hydrogen from further diffusing in the collecting pipe 31, avoid the continuous increase in the amount of hydrogen leakage, and thus reduce the risk of serious safety accidents such as explosions. Through the effective closure of the closing device 32, precious time can be gained for the safe flight of the drone and subsequent maintenance and processing, ensuring the safety of the drone itself, the surrounding environment and personnel.

[0043] See also Figures 6 to 8As shown, the closing device 32 includes a closing regulating tube 321 installed at the axial center position of the collecting pipe 31, and a plurality of connecting holes 3211 are provided on the outside of the closing regulating tube 321. The connecting holes 3211 correspond one-to-one to the first air outlet 264. The closing device 32 also includes a rotating driver 322 for driving the closing regulating tube 321 to rotate and adjust.

[0044] The connecting hole 3211 on the closed regulating tube 321 is used to circulate the hydrogen flowing out of the first gas outlet 264. When a hydrogen leak occurs in the hydrogen fuel cell stack 1, the guide pipe strip 2 will guide the hydrogen to the first gas outlet 264, and the first gas outlet 264 will transport the hydrogen to the collecting pipe 31. Subsequently, the hydrogen enters the closed regulating tube 321 from the connecting hole 3211, and the closed regulating tube 321 can effectively transport the hydrogen to the second gas outlet 34. If a hydrogen leak occurs, the rotary driver 322 will be started. When the rotary driver 322 is started, it will drive the closed regulating tube 321 to rotate and adjust. When the closed regulating tube 321 rotates and adjusts, the rotation of the closed regulating tube 321 will drive the connecting hole 3211 to adjust the position, so that the connecting hole 3211 is away from the first gas outlet 264, and then each first gas outlet 264 is sealed, effectively ensuring that the leaked hydrogen stays in the corresponding guide pipe strip 2, achieving effective emergency treatment.

[0045] See also Figures 9 to 13 As shown, the assembly fixing layer 41 is composed of a plurality of pressing parcel racks 411 and a plurality of assembling parcel racks 412. The bottom of the pressing parcel rack 411 is provided with a support bolt 4111, and the top of the pressing parcel rack 411 is installed with a limit clamping shaft 4112. The splicing ends of the pressing parcel rack 411 are provided with an inclined clamping groove 4113, and the splicing ends of the assembling parcel rack 412 are provided with an inclined plug block 4121. The inner walls of the pressing parcel rack 411 and the assembling parcel rack 412 are provided with a plurality of pressing channels 414.

[0046] The size and shape of the pressing channel 414 of the pressing parcel rack 411 and the assembled parcel rack 412 are adapted to the guide tube strip 2. When the guide tube strip 2 is placed in the pressing channel 414, the pressing channel 414 can generate a certain clamping force on the guide tube strip 2, thereby limiting and fixing the guide tube strip 2 in a specific position.

[0047] During flight, the drone is subject to various external forces, such as airflow impact and vibration, which can cause the guide strips 2 to shift or become loose. However, the assembly and fixing layer 41, through the pressing channels 414, secures the guide strips 2, effectively limiting their movement and ensuring they remain tightly covered within the gaps of the hydrogen fuel cell board 11. This ensures that the drainage channel 23 formed by the guide strips 2 maintains its sealing and stability, allowing leaked hydrogen to flow smoothly along the drainage channel 23 into the leak detection device, ensuring the proper operation of the hydrogen leak guidance and detection system.

[0048] Both the compression parcel rack 411 and the assembly parcel rack 412 are equipped with several heat dissipation holes. Gaps between the guide tubes 2 ensure that external air can reach the surface of the hydrogen fuel cell, facilitating heat dissipation. The assembly fixing layer 41 not only stabilizes the position of the guide tubes 2, but also ensures proper airflow through the heat dissipation holes.

[0049] External air can reach the surface of the hydrogen fuel cell stack 1 through the heat dissipation holes, removing the heat generated during operation, thereby maintaining the hydrogen fuel cell stack 1 within an appropriate operating temperature range. This not only helps improve the performance and efficiency of the battery pack, but also extends the service life of the battery pack.

[0050] The upper end of the pressing and parcel rack 411 is engaged with the fixed mounting bracket 43 via a position-limiting locking shaft 4112. This locking mechanism provides a position-limiting effect, preventing horizontal displacement of the assembly and fixing layer 41. Simultaneously, support bolts 4111 at the lower end of the pressing and parcel rack 411 extend toward the fixed mounting bracket 43, providing support and fixation. The support bolts 4111 are designed to withstand the weight of the assembly and fixing layer 41 and the guide tube 2, as well as the vibration and impact forces generated during drone flight, ensuring the stability of the assembly and fixing layer 41. Furthermore, the inclined inserts 4121 of the assembly and parcel rack 412 are designed to fit into the inclined locking slots 4113 of the pressing and parcel rack 411, enabling the pressing and parcel rack 411 and assembly and fixing rack 412 to be assembled. This inclined locking design provides excellent connection strength and stability, forming a solid structure for the assembly and fixing layer 41, further enhancing its position-limiting and fixation effect on the guide tube 2. The assembly fixing layer 41 can effectively stabilize the guide tube strips 2 , ensure the heat dissipation performance of the hydrogen fuel cell stack 1 , and achieve its own stable installation.

[0051] See also Figures 9 to 12 As shown, a rubber contact layer 4312 is provided inside the anti-rotation mounting groove 4311 , and an anti-slip strip is provided inside the rubber contact layer 4312 .

[0052] The staff rotates the support bolt 4111, and the support bolt 4111 is threadedly connected to the assembly fixing frame, so that the support bolt 4111 extends downward and enters the anti-rotation installation groove 4311. At this time, the rubber contact layer 4312 and the anti-slip strip squeeze and limit the support bolt 4111, ensuring that the support bolt 4111 is stably installed in the designated position. The support bolt 4111 bears the weight of the assembly fixing layer 41, the guide pipe strip 2 and other components through its rigid structure, and transfers these loads to the installation base plate 431, and then to the hydrogen fuel cell stack 1. At the same time, the stable support effect of the anti-rotation installation groove 4311 also ensures the vertical position accuracy of the assembly fixing layer 41, preventing it from being displaced due to loosening or rotation of the support bolt 4111, thereby ensuring that the assembly fixing layer 41 can accurately limit and fix the guide pipe strip 2, ensuring the normal operation of the hydrogen leak guidance and detection system.

[0053] See also Figure 9 and Figure 12 As shown, a hydrogen fuel cell pack for a drone with a leak-proof component also includes a fitting and limiting mechanism installed on the outside of the hydrogen fuel cell pack 1. The fitting and limiting mechanism includes a fixed mounting frame 43 fixedly installed on the outside of the hydrogen fuel cell pack 1. An assembling and fixing layer 41 is installed on the fixed mounting frame 43. The inner wall of the assembling and fixing layer 41 is in conflict with the guide pipe strip 2. A detachable dust-proof filter layer 42 is provided on the outside of the assembling and fixing layer 41.

[0054] The fixed mounting frame 43 provides a stable mounting base for the entire fitting limit mechanism. During the installation process, the fixed mounting frame 43 is firmly mounted at a designated position outside the hydrogen fuel cell stack 1 to ensure that it will not be displaced due to factors such as vibration during the flight of the drone.

[0055] An assembly fixing layer 41 is installed on the fixed mounting frame 43. The assembly fixing layer 41 is tightly connected to the fixed mounting frame 43, and the inner wall of the assembly fixing layer 41 directly contacts the guide tube strip 2. The guide tube strip 2 covers each gap in the stacked hydrogen fuel cell board 11 and is used to guide the hydrogen leaked in the gap to the leak detection device. The assembly fixing layer 41 plays a role in limiting and fixing the guide tube strip 2 by contacting the guide tube strip 2. When the drone is subjected to various external forces during flight, the assembly fixing layer 41 can effectively limit the movement of the guide tube strip 2, preventing the guide tube strip 2 from deflecting or loosening, thereby ensuring that the guide tube strip 2 can always tightly cover the gap in the hydrogen fuel cell board 11, ensuring the sealing and stability of the drainage airway 23, and allowing the leaked hydrogen to flow smoothly along the drainage airway 23 into the leak detection device.

[0056] Gaps are left between the guide bars 2 to avoid completely obstructing the outer wall of the hydrogen fuel cell, ensuring that outside air can reach the surface of the hydrogen fuel cell, facilitating heat dissipation. The assembly and fixing layer 41 secures the position of the guide bars 2 without blocking these gaps, thereby ensuring the proper heat dissipation of the hydrogen fuel cell stack 1. Furthermore, the excellent fit of the assembly and fixing layer 41 with the guide bars 2 further enhances the sealing fit between the guide bars 2 and the sides of the hydrogen fuel cell board 11, preventing hydrogen leakage from the mounting gaps between the guide bars 2 and the board, and ensuring the proper operation of the hydrogen leak guidance and detection system.

[0057] A detachable dust-proof filter layer 42 is provided on the outside of the assembly fixing layer 41, and the external airflow can pass through the dust-proof filter layer 42 and contact the surface of the hydrogen fuel cell stack 1. During the flight of the drone, dust and other impurities in the external environment may contact the hydrogen fuel cell stack 1 with the airflow. The dust-proof filter layer 42 can effectively shield the assembly fixing layer 41 and the outer surface of the hydrogen fuel cell stack 1, preventing dust and other impurities from entering the interior of the hydrogen fuel cell stack 1 or adhering to the surface of the battery pack. The accumulation of dust may affect the heat dissipation performance of the hydrogen fuel cell stack 1, and may even cause damage to the internal components of the battery pack, thereby reducing the service life and performance of the battery pack. The dust-proof filter layer 42 keeps the environment around the hydrogen fuel cell stack 1 clean by filtering dust in the air, reduces the adverse effects of dust on the performance of the battery pack, and ensures the stable operation of the hydrogen fuel cell stack 1. At the same time, the detachable design facilitates regular cleaning or replacement of the dust-proof filter layer 42 to ensure that its dust-proof effect is always in good condition.

[0058] See also Figures 9 to 12 As shown, the fixed mounting frame 43 includes a mounting base plate 431 mounted on the bottom of the hydrogen fuel cell stack 1, and the mounting base plate 431 is provided with a plurality of anti-rotation mounting grooves 4311 for fixing support bolts 4111. The fixed mounting frame 43 also includes a mounting top plate 432 mounted on the top of the hydrogen fuel cell stack 1, and the mounting top plate 432 is provided with a plurality of clamping mechanisms 4321 for fixing limiting clamping shafts 4112. Limiting grooves are provided on both the mounting base plate 431 and the mounting top plate 432.

[0059] The fixed mounting frame 43 is composed of a mounting base plate 431 and a mounting top plate 432, which are respectively adapted to be mounted at the bottom and top of the hydrogen fuel cell stack 1. Both the mounting base plate 431 and the mounting top plate 432 are provided with limiting grooves, the geometric dimensions and shapes of which precisely match the external features of the corresponding mounting locations of the hydrogen fuel cell stack 1. During installation, the mounting base plate 431 precisely aligns with the positioning structure at the bottom of the hydrogen fuel cell stack 1 by means of its limiting grooves, and the mounting top plate 432 similarly precisely matches the positioning structure at the top of the hydrogen fuel cell stack 1 by means of limiting grooves. This precise alignment installation method based on limiting grooves can effectively eliminate installation errors, ensuring that the fixed mounting frame 43 is precisely installed at the designated location outside the hydrogen fuel cell stack 1, providing a precise reference for the installation of subsequent components. After the alignment is completed, the mounting base plate 431 and the mounting top plate 432 are fastened in series using connecting screws 433 to achieve the overall installation of the fixed mounting frame 43.

[0060] The mounting base 431 is provided with a plurality of anti-rotation mounting grooves 4311. The bottoms of the support bolts 4111 are anti-rotationally mounted in the anti-rotation mounting grooves 4311, ensuring that the support bolts 4111 do not rotate when subjected to force, thereby providing stable support for the assembly and fixing layer 41. During flight, the support bolts 4111 can bear the weight of the assembly and fixing layer 41, the guide tube 2, and other components. Their rigid structure resists vibration and impact, preventing the assembly and fixing layer 41 from vertical displacement and ensuring that the assembly and fixing layer 41 is always correctly installed.

[0061] The mounting top plate 432 is used to engage the fixed position-limiting engaging shaft 4112. The mounting top plate 432 is provided with a plurality of engaging mechanisms 4321 that can reliably engage with the position-limiting engaging shaft 4112. When the assembly fixing layer 41 is installed, the position-limiting engaging shaft 4112 is inserted into the engaging mechanism 4321 of the mounting top plate 432. The elastic deformation or mechanical locking action of the engaging mechanism 4321 securely engages the position-limiting engaging shaft 4112. This engaging method can provide both lateral and longitudinal limiting functions, preventing the assembly fixing layer 41 from shifting horizontally, and ensuring the stability of the connection between the assembly fixing layer 41 and the fixed mounting frame 43.

[0062] See also Figures 9 to 12 As shown, the clamping mechanism 4321 includes a limiting clamping groove 4322 arranged on the side of the mounting top plate 432, and a pressing clamping joint 4323 is slidably installed on the side of each limiting clamping groove 4322, and an inclined clamping surface 4324 is installed on the pressing clamping joint 4323, and a second spring 4325 is installed between the pressing clamping joint 4323 and the mounting top plate 432.

[0063] In the initial state, the second spring 4325 is in a naturally extended state. At this time, under the elastic force of the second spring 4325, the inclined engaging surface 4324 of the pressing engaging joint 4323 partially extends into the limiting engaging groove 4322, forming a certain obstruction to the passage of the limiting engaging groove 4322. The size and shape of the limiting engaging groove 4322 are compatible with the external features of the limiting engaging shaft 4112, providing a precise path and positioning for the installation of the limiting engaging shaft 4112.

[0064] To install the limiting snap-in shaft 4112 into the limiting snap-in slot 4322, a worker pushes the pressing joint 4323. This force causes the pressing joint 4323 to slide along the side of the limiting snap-in slot 4322. This pressure exerts pressure on the second spring 4325, causing it to undergo elastic compression and deformation. As the pressing joint 4323 moves, the inclined snap-in surface 4324, which had previously extended into the limiting snap-in slot 4322, gradually moves out, opening the slot 4322 and facilitating the insertion of the limiting snap-in shaft 4112. The worker inserts the limiting snap-in shaft 4112 along the path of the limiting snap-in slot 4322. Once the limiting snap-in shaft 4112 reaches the designated installation position, the worker stops pushing the pressing joint 4323. At this point, the second spring 4325 begins to return to its original shape due to the disappearance of the compression force, generating an elastic restoring force. The restoring force of the second spring 4325 pushes the pressing joint 4323 to slide in the direction opposite to the previous pushing direction, causing the inclined engaging surface 4324 to move back into the limiting engaging groove 4322 and eventually press against the outer surface of the limiting engaging shaft 4112.

[0065] The inclined clamping surface 4324 has a certain inclination angle. When the second spring 4325 pushes the pressing clamping joint 4323 to make the inclined clamping surface 4324 press against the limiting clamping shaft 4112, a push-fit structure is formed between the inclined clamping surface 4324 and the limiting clamping shaft 4112.

[0066] Because the second spring 4325 is always in a certain elastic compression state, it exerts a continuous elastic force on the pressing joint 4323. This elastic force is transmitted to the inclined engaging surface 4324 through the pressing joint 4323, so that the inclined engaging surface 4324 always maintains its pressing effect on the limiting engaging shaft 4112. Even if the limiting engaging shaft 4112 is affected by external factors such as vibration and impact during long-term use, the inclined engaging surface 4324 can automatically adjust its pressing position and force under the elastic force of the second spring 4325, ensuring that the limiting engaging shaft 4112 is always in a stable installation state, thereby ensuring the reliability and stability of the connection between the assembly fixing layer 41 and the fixed mounting frame 43.

[0067] Specific working principle:

[0068] After production, the hydrogen fuel cell panels 11 are stacked, with independent guide structures placed at each gap in the stack. Several guide tube strips 2 within the guide structure cover these gaps. One side of the guide tube strips 2 is open and fits tightly against the side of the hydrogen fuel cell panels 11, forming a drainage airway 23. The drainage airway 23 has an outlet connected to the leakage monitoring device 3. Gaps are left between the guide tube strips 2. This design ensures that external air can reach the surface of the hydrogen fuel cell stack 1, facilitating heat dissipation, while also preventing the guide structure from completely obscuring the outer wall of the hydrogen fuel cell stack 1. Furthermore, the gaps between each hydrogen fuel cell panel 11 are connected to the drainage airway 23 of the corresponding guide tube strip 2, ensuring that any hydrogen that may leak from the gaps can smoothly enter the drainage airway 23.

[0069] During extended use of the hydrogen fuel cell panels 11, hydrogen may leak from the gaps between the panels due to factors such as aging of the sealing layer. Once hydrogen leaks from these gaps, it will directly enter the drainage duct 23. The drainage duct 23 effectively prevents direct leakage into the external environment, and the leaked hydrogen flows along the drainage duct 23 into the leakage monitoring device 3.

[0070] The leak monitoring device 3 features real-time monitoring capabilities. Upon detecting a hydrogen leak, it immediately issues an alarm signal, prompting the operator to take timely action. Simultaneously, the leak monitoring device 3 rapidly seals the hydrogen pipeline, preventing further leakage and trapping the leaked hydrogen in the corresponding guide strips 2. The flow-blocking effect of the guide strips 2 effectively prevents hydrogen from leaking and diffusion, thus achieving emergency response. This emergency response mechanism ensures that the hydrogen fuel cell stack 1 can continue operating for a certain period of time, providing the drone with sufficient time to return home and ensuring flight safety.

[0071] The above embodiments merely represent one or more embodiments of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of protection of the present invention. It should be noted that a person of ordinary skill in the art may make various modifications and improvements without departing from the spirit of the present invention, and these modifications and improvements fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be determined by the appended claims.

Claims

1. A hydrogen fuel cell stack for drones with a leak-proof assembly, comprising stacked hydrogen fuel cell plates and a leak detection device, characterized in that: The leak detection device includes a leak monitoring device for detecting leaked hydrogen. Each gap in the stack is independently provided with a guide structure for guiding hydrogen leaking from the gap to the leak monitoring device. The guide structure includes a guide tube strip. One side of the guide tube strip is open and covers the gap to form a drainage airway. The drainage airway has an outlet end connected to the leak monitoring device. The fitting edge of the guide tube strip is provided with an adhesive layer and a sealing strip, and the connection of the guide tube strip is provided with a clamping fixing mechanism for easy installation; The clamping and fixing mechanism includes a plug-in connector installed at one end of the guide pipe strip, the plug-in connector is provided with a limit clamping hole, a fixed clamping connector is installed at the end of the guide pipe strip away from the plug-in connector, the fixed clamping connector is provided with a docking slot, a movable clamping plate is installed on the docking slot, the movable clamping plate is used to clamp the fixed plug-in connector, and the fixed clamping connector is provided with a plurality of first air outlets; The leakage monitoring device includes a collecting pipe connected to the first gas outlet, a sealing device is provided inside the collecting pipe, a second gas outlet is provided at the bottom of the collecting pipe, and a sensor for detecting leaked gas is installed on the second gas outlet; The closing device includes a closing regulating tube installed at the axial center of the collecting pipe, and a plurality of communication holes are provided on the outer side of the closing regulating tube, and the communication holes correspond to the first air outlets one by one. The closing device also includes a rotary driver for driving the closing regulating tube to rotate and adjust; The assembly fixing layer consists of multiple pressing parcel racks and multiple assembling parcel racks. The bottom of the pressing parcel rack is provided with a support bolt, and the top of the pressing parcel rack is installed with a limited clamping shaft. The splicing ends of the pressing parcel rack are provided with inclined clamping grooves, and the splicing ends of the assembling parcel rack are provided with inclined plugs. The inner walls of the pressing parcel rack and the assembling parcel rack are provided with a plurality of pressing channels. A rubber contact layer is provided inside the anti-rotation installation groove, and an anti-slip strip is provided inside the rubber contact layer.

2. The hydrogen fuel cell stack for drones with a leak-proof assembly according to claim 1, characterized in that: It also includes a fitting and limiting mechanism installed on the outside of the hydrogen fuel cell group. The fitting and limiting mechanism includes a fixed mounting frame fixedly installed on the outside of the hydrogen fuel cell group. An assembling and fixing layer is installed on the fixed mounting frame. The inner wall of the assembling and fixing layer is in conflict with the guide pipe strip. A detachable dust-proof filter layer is provided on the outside of the assembling and fixing layer.

3. The hydrogen fuel cell stack for drones with a leak-proof assembly according to claim 1, characterized in that: The fixed mounting frame includes a mounting base plate installed at the bottom of the hydrogen fuel cell stack, the mounting base plate is provided with a plurality of anti-rotation mounting grooves for fixing support bolts, the fixed mounting frame also includes a mounting top plate installed at the top of the hydrogen fuel cell stack, the mounting top plate is provided with a plurality of clamping mechanisms for fixing limiting clamping shafts, and both the mounting base plate and the mounting top plate are provided with limiting grooves.

4. The hydrogen fuel cell stack for drones with a leak-proof assembly according to claim 3, characterized in that: The clamping mechanism includes a limiting clamping groove arranged on the side of the mounting top plate, and a pressing clamping joint is slidably installed on the side of each limiting clamping groove. An inclined clamping surface is installed on the pressing clamping joint, and a second spring is installed between the pressing clamping joint and the mounting top plate.

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