V-shaped hydrogen storage bottle for hydrogen fuel unmanned aerial vehicle and manufacturing process of V-shaped hydrogen storage bottle

Abstract

The invention discloses a V-shaped hydrogen storage bottle for a hydrogen fuel unmanned aerial vehicle and a manufacturing process of the V-shaped hydrogen storage bottle, and belongs to the technical field of hydrogen high-pressure storage of the hydrogen fuel unmanned aerial vehicle. The manufacturing process comprises the following steps that (1) a rubber air bag is manufactured to serve as a winding mold core, and the rubber air bag can be used in an inflated state; (2) the surface of the rubber air bag is subjected to release agent treatment and inflated, and the baked rubber film is laid on the rubber air bag; (3) carbon fiber epoxy resin winding is conducted on the rubber air bag obtained in the step (2), the fiber pre-tightening force is controlled to decrease progressively in a staged mode in the winding process, and a carbon fiber winding layer is obtained; (4) curing, demolding and deflating the wound rubber air bag obtained in the step (3), and then recycling, and (5) spraying a temperature-resistant protective layer on the surface of the rubber air bag obtained in the step (4) to obtain the temperature-resistant protective layer, so that the V-shaped hydrogen storage bottle is obtained.The method is used for solving the technical problems that a mold core of the V-shaped hydrogen storage bottle manufactured through an existing method cannot be recycled, and the anti-seepage performance is poor.

Description

Technical Field

[0001] This invention belongs to the field of high-pressure hydrogen storage technology for hydrogen fuel cell drones, specifically relating to a V-shaped hydrogen storage cylinder for hydrogen fuel cell drones and its manufacturing process. Background Technology

[0002] High-pressure hydrogen storage cylinders for new energy drones are essential components for storing hydrogen fuel in fuel cell drones, representing a vital product for the hydrogen fuel cell drone industry with broad application prospects. Currently, most high-pressure (70 MPa) hydrogen storage cylinders used in hydrogen fuel cell drones are Type III cylinders, with a few being Type IV cylinders. These cylinders have low storage capacity and are heavy.

[0003] Chinese patent CN117584506A discloses a V-shaped hydrogen storage cylinder and its preparation method. Through a linerless, fully fiber-wound V-shaped hydrogen storage cylinder design, it solves the problem of the liner affecting hydrogen storage efficiency, achieving higher hydrogen storage density and airtightness, while reducing production costs. However, the core of this V-shaped hydrogen storage cylinder is a disposable water-soluble liner. This single-use mode means the core cannot be recycled, increasing raw material consumption and production costs, and potentially causing environmental problems due to improper handling of dissolved residues. Furthermore, coating the inner and outer sides of the liner with gel coat layers (with water-permeable holes in the inner gel coat layer) achieves fiber layer bonding, but during the curing process, uneven resin penetration or dissolved residues can create micropores, leading to decreased interfacial leak-proof performance. During long-term high-pressure cyclic filling and discharging, hydrogen may leak slightly along the interface, limiting the cylinder's fatigue life (making it difficult to reach more than 10,000 cycles). Summary of the Invention

[0004] In order to overcome the shortcomings of the prior art, the present invention aims to provide a V-shaped hydrogen storage cylinder for hydrogen fuel cell drones and its manufacturing process, so as to solve the technical problems of the inability to recycle the mold core and poor leakage prevention performance of the V-shaped hydrogen storage cylinders manufactured by the existing methods.

[0005] To achieve the above objectives, the present invention employs the following technical solution: This invention provides a manufacturing process for a V-shaped hydrogen storage cylinder for hydrogen fuel cell drones, comprising the following steps: 1) Fabricate a rubber airbag as a winding mold core, wherein the rubber airbag can be used in an inflated state; 2) Treat the surface of the rubber airbag with a release agent, inflate it, and then apply the baked rubber film onto the rubber airbag; 3) Carbon fiber epoxy resin is wound onto the rubber airbag obtained in step 2). During the winding process, the fiber preload is controlled to decrease in stages to obtain a carbon fiber winding layer. 4) The rubber airbag obtained in step 3) is cured and demolded, and the rubber airbag is recycled after deflating for reuse. 5) Spray a heat-resistant protective layer onto the surface of the rubber airbag obtained in step 4) to obtain a heat-resistant protective layer and thus obtain a V-shaped hydrogen storage bottle.

[0006] In a further preferred embodiment, in step 1), a rubber airbag is made on a vulcanizing mold, wherein the vulcanizing mold is made of metal.

[0007] Preferably, in step 1), support shafts are installed at both ends of the rubber bladder, and an inflation / deflation port with an opening size of φ10mm-φ15mm is opened at the center of the support shaft for inflation / deflation and clamping in the winding machine.

[0008] More preferably, the support shaft is made of aluminum rod.

[0009] Preferably, in step 2), the release agent is applied 2-5 times, and dried for 3-5 minutes after each application, with a cumulative release agent thickness of 0.05mm-0.15mm.

[0010] In a further preferred embodiment, in step 2), the rubber airbag is treated to remove oil stains, water stains and dust before the release agent treatment.

[0011] In a further preferred embodiment, in step 2), the rubber airbag is inflated before the adhesive film is laid, with an inflation pressure of 0.6 MPa, and then clamped onto the wrapping machine after full inflation; the adhesive film is laid after baking, because at this time the adhesive film surface has sufficient adhesion and does not soften.

[0012] Preferably, in step 2), the baking temperature is 60-75℃, the baking time is 35-50min, and the film thickness is 0.08mm-0.15mm.

[0013] More preferably, in step 2), the inflation pressure is 0.6 MPa.

[0014] Preferably, in step 3), the carbon fiber epoxy resin winding adopts a three-stage preload control: The first stage applies a force of 100N-90N, with a winding thickness of 3.0mm-4.0mm; The second stage applies a force of 85N-70N, with a winding thickness of 4mm-5mm; The third stage applies a force of 45N-30N, with a winding thickness of 1mm-1.5mm; The total winding thickness is 8.5mm-10.0mm.

[0015] Further preferred, the fiber is Toray T700 (model), 12K (specification), and the epoxy resin is Huibai resin 4184 (product model code) medium-temperature epoxy resin.

[0016] Preferably, in step 3), before the fiber is wound, it is first treated in an impregnation tank. A small impregnation tank is added at the front end of the impregnation tank, which contains a fireproof and heat-conducting graphite mixture solution.

[0017] Further preferably, in step 3), after the carbon fiber epoxy resin winding is completed, it is idled for 3 hours. The purpose of idling is to alleviate the initial stress in the fiber layer caused by the three-stage pre-tightening force control during winding, thus preventing stress concentration during curing. After idling, it directly enters the multi-stage curing process. The pre-gel state ensures a stable curing reaction, and the temperature profile can be applied efficiently without causing delamination. By improving interface quality, idling indirectly supports the adhesion of the heat-resistant protective layer, ensuring the durability of the hydrogen storage tank under UAV operating conditions.

[0018] Preferably, in step 4), the curing process includes multi-stage temperature control: The first stage is 55℃-65℃, and the temperature is maintained for 50min-70min; The second stage is 85℃-95℃, and the temperature is maintained for 100min-140min; The third stage is 115℃-125℃, and the temperature is maintained for 50min-70min; The fourth stage is at 145℃-155℃, with a holding time of 50-70 minutes; The fifth stage is at 175℃-185℃, with a holding time of 100min-140min; The sixth stage is 20℃-30℃, and the temperature is maintained for 150min-210min.

[0019] In a further preferred embodiment, in step 4), the curing process is carried out in a rotary curing oven to ensure that the bottle is heated evenly during the heating process and to avoid resin settling or shape distortion caused by gravity.

[0020] Preferably, in step 5), the heat-resistant protective layer is a sprayed room-temperature curing phenolic resin with a thickness of 0.3mm-0.8mm.

[0021] Preferably, in step 1), the thickness of the rubber airbag is 4mm-6mm; in step 3), the width of the yarn when the carbon fiber epoxy resin is wound is not less than 10mm.

[0022] In a further preferred embodiment, in step 4), after recycling, the mold release agent is treated as in step 2) and then placed for later use.

[0023] The present invention also provides a V-shaped hydrogen storage cylinder for hydrogen fuel cell drones manufactured using the above-described manufacturing process. The hydrogen storage cylinder consists of a rubber airbag, a carbon fiber winding layer, and a heat-resistant protective layer from the inside out. A support shaft is provided at each end of the hydrogen storage cylinder body, and an inflation / deflation port is provided on the support shaft.

[0024] Compared with the prior art, the present invention has the following beneficial effects: This invention provides a manufacturing process for a V-shaped hydrogen storage cylinder for hydrogen fuel cell drones. By using an inflatable rubber bladder as a recyclable mold core and coating its surface with a release agent and adhesive film, epoxy resin penetration into the rubber layer is effectively prevented, ensuring the airtightness of the hydrogen storage cylinder. Phased, decreasing fiber preload control optimizes the stress distribution of the winding layer, improving structural uniformity and pressure resistance. Demolding after curing allows for the recycling of the rubber bladder, significantly reducing manufacturing costs. An outer heat-resistant protective layer enhances environmental adaptability. This process solves the problems of traditional high-pressure hydrogen storage cylinder mold cores being non-reusable, having poor sealing, high manufacturing costs, and short lifespan, enabling the mass production of lightweight, highly reliable, and long-life (up to 15,000 charge-discharge cycles) V-shaped hydrogen storage cylinders.

[0025] Furthermore, by adding support shafts with integrated inflation and deflation functions to both ends of the rubber bladder, not only is rapid positioning and secure clamping of the mold core achieved, improving the dynamic stability of the winding process, but also an integrated gas path and mechanical connection channel is constructed through the centrally located inflation and deflation ports within the φ10mm–φ15mm range. This simplifies equipment interface configuration and enhances the level of process automation. This structural design solves the problems of inaccurate positioning, inconvenient inflation, and difficult demolding that are common in traditional flexible mold cores during high-speed winding. It significantly enhances the repeatability and operational efficiency of the manufacturing system and is suitable for high-precision, high-volume production scenarios for the preparation of V-type hydrogen storage cylinders for hydrogen fuel cell drones.

[0026] Furthermore, by adopting a multi-coating and sequential drying method, the defects that are easily generated by traditional single-coating thick coating and the difficulty of full coverage by thin coating are avoided. This achieves reliable demolding, clean interface, and the rubber mold core can be reused more than 15,000 times, which significantly reduces the manufacturing cost of V-shaped hydrogen storage cylinders and improves production stability.

[0027] Furthermore, by coordinating the control of baking temperature, time, and film thickness, the film is kept in a suitable viscous flow state and has sufficient structural integrity, so it can closely fit the V-shaped curved contour of the rubber airbag, effectively preventing the epoxy resin from penetrating inward during the winding process. This significantly improves the interface quality between the winding layer and the inner liner, ensuring the sealing reliability and service life of the final hydrogen storage cylinder under high-pressure cycling conditions.

[0028] Furthermore, by reducing the fiber preload in stages, the method adapts to the actual situation of changes in stiffness and increased curvature from the inside to the outside of the structure, avoiding problems such as excessive compression of the inner layer or poor adhesion of the outer layer caused by constant tension. By matching appropriate preload levels at different winding stages, the stress distribution within the fiber layer becomes more reasonable: high tension in the initial stage ensures the compactness of the base layer, moderate tension reduction in the middle stage adapts to the mechanical changes brought about by the thickening of the structure, and low tension in the final stage avoids surface damage. This gradient tension control method effectively improves the bonding quality between composite material layers and the consistency of the overall structure, preventing the propagation of microcracks in the inner layer and the slippage and debonding of the outer layer that are easily caused by traditional constant tension winding. This significantly enhances the long-term service reliability and fatigue life of hydrogen storage cylinders under 70MPa high-pressure conditions. At the same time, this method has good process repeatability and engineering applicability; the parameter range has been verified through multiple rounds of testing, making it suitable for the large-scale production of lightweight high-pressure hydrogen storage containers for various high-performance unmanned aerial vehicles.

[0029] Furthermore, by setting up a small impregnation tank at the front end and using a graphite-containing mixed solution for pretreatment, the temperature of the fiber entering the tank is effectively controlled, the risk of early resin reaction is suppressed, and the safety hazards and process fluctuations caused by temperature rise during the traditional impregnation process are prevented. This improves the quality consistency and production reliability of the carbon fiber winding layer, and is particularly suitable for the preparation of products with extremely high requirements for structural integrity, such as 70MPa high-pressure V-type hydrogen storage cylinders.

[0030] Furthermore, by employing a staged heating and slow cooling process, the epoxy resin can complete the entire process of flow, gelation, crosslinking, and post-curing step by step, avoiding the problems of localized overheating, reaction lag, or stress concentration commonly found in traditional single-stage curing. Therefore, the prepared V-shaped hydrogen storage cylinder possesses higher structural uniformity, lower internal stress levels, and superior long-term service stability, reliably withstanding high-frequency charging and discharging cycles and complex environmental loads, meeting the safe operation requirements of hydrogen fuel cell drones under extreme conditions such as high altitude and high speed.

[0031] Furthermore, by using room-temperature curing phenolic resin materials and controlling the thickness within the range of 0.3–0.8 mm, the destructive effects of ultraviolet radiation, damp heat erosion, and mechanical wear on the carbon fiber winding layer are effectively isolated, extending the service life of the hydrogen storage tank under high-altitude and variable climate conditions. Moreover, the coating can be completed without additional heating equipment, simplifying the process and reducing energy consumption and equipment costs. At the same time, it takes into account the lightweight design goal and meets the integrated requirements of hydrogen fuel cell drones for high specific strength, long life and high safety.

[0032] Furthermore, by setting the thickness of the rubber airbag to 4–6 mm, it can maintain shape stability and have good elastic recovery ability when subjected to internal air pressure, thus overcoming the problems of easy damage or difficulty in demolding of the mold core; the yarn width during carbon fiber winding is not less than 10 mm, which significantly improves the uniformity of fiber arrangement and resin impregnation effect, reduces porosity and improves the mechanical transfer efficiency of the composite layer.

[0033] This invention also provides a V-shaped hydrogen storage cylinder for hydrogen fuel cell drones manufactured using the aforementioned process. The rubber gasbag serves as a reusable inner mold core, avoiding the one-time consumption of traditional rigid molds and reducing manufacturing costs. The carbon fiber winding layer design enables it to effectively withstand the circumferential and axial stresses generated by 70MPa high-pressure hydrogen, significantly improving specific strength. The outer heat-resistant protective layer enhances resistance to external heat sources, ensuring flight safety. The V-shaped overall configuration improves adaptability and integration within the confined space of the drone. The integrated support shaft design at both ends achieves integrated mechanical fixing and gas passage, simplifying the installation process and improving maintenance convenience. Therefore, this hydrogen storage cylinder is particularly suitable for long-endurance hydrogen fuel cell drone platforms that are weight-sensitive, space-constrained, and require high reliability, solving the technical problems of bulky, difficult-to-install, and short-life hydrogen storage devices in existing technologies. Attached Figure Description

[0034] Figure 1 This is a cross-sectional view of the V-shaped hydrogen storage cylinder of the present invention; Figure 2 This is a surface structure diagram of the V-shaped hydrogen storage bottle of the present invention.

[0035] Wherein: 1-Support shaft; 2-Pure gas; 3-Rubber airbag; 4-Carbon fiber winding layer; 5-Temperature resistant protective layer; 6-Inflation / depression port. Detailed Implementation

[0036] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0037] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0038] The present invention will now be described in further detail with reference to the accompanying drawings: Example 1 See Figure 1 and Figure 2 This embodiment 1 provides a manufacturing process for a V-shaped hydrogen storage cylinder for hydrogen fuel cell drones, including the following steps: 1) Make a rubber airbag 3 as a winding mold core. The rubber airbag 3 can be used in an inflated state. The rubber airbag 3 is integrally molded from a high-elasticity material such as natural rubber or silicone rubber using a vulcanization mold. Its thickness ranges from 4mm to 6mm, with 5mm being optional, ensuring full expansion without localized bulging or deformation under a working pressure of 0.6MPa. The rubber airbag 3 is folded and contracted in its uninflated state for easy installation and disassembly; after inflation, it forms a stable V-shaped profile, serving as the base surface for subsequent fiber winding. Due to its reversible deformation capability, it can recover its initial shape and be reused after each demolding, significantly reducing mold wear costs. In an optional embodiment, a polyurethane elastomer can be used instead of rubber to improve wear resistance and anti-aging properties. The rubber airbag 3 is filled with pure gas 2. Support shafts 1 are installed at both ends of the rubber airbag 3, with an inflation / deflation port 6 at the center of each support shaft 1. The opening size is φ10mm-φ15mm, used for inflation / deflation and clamping in the winding machine.

[0039] 2) Treat the surface of the rubber airbag 3 with a release agent, inflate it, and then apply the baked rubber film onto the rubber airbag 3. The release agent is a water-based or solvent-based release agent, such as polytetrafluoroethylene dispersion or wax emulsion. It is applied evenly to the surface of the rubber airbag 3 by spraying or brushing, 2–5 times, with an interval of 3–5 minutes between each application, and dried at 60–80°C, to form a release layer with a cumulative thickness of 0.05–0.15 mm, optionally 0.1 mm. This release agent layer effectively prevents epoxy resin from penetrating into the rubber matrix, avoiding adhesion and demolding failure. Subsequently, the rubber airbag 3 is inflated to a predetermined pressure (e.g., 0.6 MPa) to fully expand and fix it between the spindles of the winding machine, ensuring consistent shape accuracy. On this basis, a pre-baked adhesive film is laid, which can be made of thermoplastic polyester or modified ethylene-vinyl acetate copolymer (EVA), with a thickness of 0.08 mm–0.15 mm, optionally 0.1 mm. The adhesive film is pre-baked at 60–75°C for 35–50 minutes to activate its surface tack, thereby ensuring a tight adhesion to the surface of the rubber airbag 3 and forming a continuous and complete transition interface. This adhesive film not only enhances the bonding strength between the carbon fiber layer and the inner liner but also further blocks resin migration, improving interface integrity. In a variant, the adhesive film can be replaced with a functional membrane with a microporous structure to regulate the volatile emission path during the curing process.

[0040] 3) Carbon fiber epoxy resin is wound onto the rubber airbag 3 obtained in step 2). During the winding process, the fiber pretension is controlled to decrease in stages to obtain the carbon fiber winding layer 4. The carbon fiber used is a high-strength standard modulus fiber, such as Toray T70012K or a product of equivalent performance level. The resin system uses a medium-temperature curing epoxy resin, such as Whitworth 4184 or bisphenol A epoxy resin combined with an amine curing agent. After the fiber tape is impregnated with resin in an impregnation tank, a pre-tensioning force is applied through a tension control system, and it is wound along a V-shaped curved surface in a spiral or circumferential trajectory at multiple angles. The yarn width is not less than 10mm to ensure that each bundle of fiber is fully spread out, reducing fuzz and pile-up defects. The preload is dynamically adjusted in three stages based on the wall thickness variation in the winding area: The first stage applies higher tension (100N–90N) to build a high-density bottom layer structure, corresponding to a winding thickness of 3.0mm–4.0mm; the second stage moderately reduces tension (85N–70N) to accommodate the stress transition requirements of the middle section, with a winding thickness of 4.0mm–5.0mm; the third stage further reduces tension (45N–30N) to prevent cracking of the outer layer due to residual stress concentration, with a winding thickness of 1.0mm–1.5mm. The total wall thickness is controlled within the range of 8.5mm–10.0mm, with 9.2mm being optional. This graded tension strategy optimizes the stress gradient distribution throughout the bottle, improving overall pressure uniformity and fatigue life. In an optional embodiment, a small impregnation tank is added at the front end of the impregnation tank, containing a fire-retardant and heat-conducting mixed solution with graphite particles, improving fiber wettability while providing initial thermal protection.

[0041] 4) The rubber airbag 3 obtained after winding in step 3) is cured and demolded. After deflating, the rubber airbag 3 is recycled for reuse. The curing process takes place in a rotary curing oven, employing a multi-stage heating regime. It sequentially undergoes low-temperature pre-curing, medium-temperature cross-linking, and high-temperature post-curing stages, specifically including: holding at 55℃–65℃ for 50–70 min; holding at 85℃–95℃ for 100–140 min; holding at 115℃–125℃ for 50–70 min; holding at 145℃–155℃ for 50–70 min; holding at 175℃–185℃ for 100–140 min; and finally cooling to 20℃–30℃ and holding for 150–210 min to release stress. Throughout the process, the workpiece is rotated at a uniform speed to ensure a uniform distribution of temperature and reaction rate. After curing, heating is stopped, and the workpiece is allowed to cool naturally. Then, the rubber airbag 3 is slowly deflated, allowing it to detach from the carbon fiber composite shell. Due to the dual isolation effect of the release agent and the adhesive film, the demolding process is smooth and damage-free. The rubber airbag 3 can be removed, cleaned, and reapplied with release agent for recycling, achieving green manufacturing. In an alternative embodiment, vacuum-assisted demolding technology can also be used, which accelerates the separation process through negative pressure suction.

[0042] 5) Spray a heat-resistant protective layer onto the surface of the rubber airbag 3 obtained in step 4) to obtain the heat-resistant protective layer 5, thus obtaining a V-shaped hydrogen storage bottle.

[0043] The heat-resistant protective layer 5 is made of room-temperature curing phenolic resin coating, which is uniformly applied to the outer surface of the carbon fiber winding layer 4 by air spraying or electrostatic spraying. The coating thickness is controlled between 0.3mm and 0.8mm, with 0.5mm being optional. This coating has excellent heat resistance, oxidation resistance, and UV resistance, and can operate stably for a long time in environments ranging from -40℃ to 150℃, effectively resisting external environmental corrosion and extending the service life of the hydrogen storage cylinder. In addition, the coating can also integrate color coding or QR code information for easy identification and tracking management. In a variant, the heat-resistant layer can also use a silicone resin or ceramic-modified polymer system to further improve high-temperature stability.

[0044] Through the above-described steps, this application achieves mass production of V-shaped high-pressure hydrogen storage cylinders based on recyclable rubber airbag mold cores. Utilizing the geometric shaping capability of the rubber airbag 3 in its inflated state ensures precise molding of the complex V-shaped structure; the release agent and the adhesive film synergistically construct an impermeable interface, significantly improving yield and sealing reliability; a phased decreasing fiber preload control strategy optimizes the interlayer stress matching of the composite material, enhancing structural integrity under 70MPa high pressure; the post-curing demolding and mold core recycling mechanism significantly reduces production costs; and the outer heat-resistant protective layer improves environmental adaptability and safety. The overall process balances lightweight, high strength, long lifespan, and economy, making it suitable for the urgent needs of hydrogen fuel cell drones for high-energy-density, high-cycle-count hydrogen storage systems.

[0045] The hydrogen storage cylinders produced by the above method can achieve 15,000 filling and discharging cycles throughout their entire service life.

[0046] The above content is only for illustrating the technical concept of the present invention and should not be construed as limiting the scope of protection of the present invention. Any modifications made to the technical solution based on the technical concept proposed in this invention shall fall within the scope of protection of the claims of this invention.

Claims

1. A manufacturing process for a V-shaped hydrogen storage cylinder for hydrogen fuel cell drones, characterized in that, Includes the following steps: 1) Make a rubber airbag (3) as a winding mold core, the rubber airbag (3) can be used in an inflated state; 2) Treat the surface of the rubber airbag (3) with a release agent and inflate it with air. Then, place the baked rubber film on the rubber airbag (3). 3) Carbon fiber epoxy resin is wound onto the rubber airbag (3) obtained in step 2). During the winding process, the fiber preload is controlled to decrease in stages to obtain a carbon fiber winding layer (4). 4) The rubber airbag (3) obtained after winding in step 3) is cured and demolded. After deflating, the rubber airbag (3) is recycled for reuse. 5) Spray a heat-resistant protective layer onto the surface of the rubber airbag (3) obtained in step 4) to obtain a heat-resistant protective layer (5) and thus obtain a V-shaped hydrogen storage bottle.

2. The manufacturing process of the V-shaped hydrogen storage cylinder for hydrogen fuel cell drones according to claim 1, characterized in that, In step 1), support shafts (1) are installed at both ends of the rubber airbag (3), and an inflation / deflation port (6) is opened in the center of the support shaft (1) for inflation / deflation and clamping in the winding machine.

3. The manufacturing process of the V-shaped hydrogen storage cylinder for hydrogen fuel cell drones according to claim 1, characterized in that, In step 2), apply the release agent 2-5 times, and dry it for 3-5 minutes after each application, with a cumulative release agent thickness of 0.05mm-0.15mm.

4. The manufacturing process of the V-shaped hydrogen storage cylinder for hydrogen fuel cell drones according to claim 1, characterized in that, In step 2), the baking temperature is 60-75℃, the baking time is 35-50min, and the film thickness is 0.08mm-0.15mm.

5. The manufacturing process of the V-shaped hydrogen storage cylinder for hydrogen fuel cell drones according to claim 1, characterized in that, In step 3), the carbon fiber epoxy resin winding adopts a three-stage preload control: The first stage applies a force of 100N-90N, with a winding thickness of 3.0mm-4.0mm; The second stage applies a force of 85N-70N, with a winding thickness of 4mm-5mm; The third stage applies a force of 45N-30N, with a winding thickness of 1mm-1.5mm; The total winding thickness is 8.5mm-10.0mm.

6. The manufacturing process of the V-shaped hydrogen storage cylinder for hydrogen fuel cell drones according to claim 1, characterized in that, In step 3), before the fiber is wound, it is first treated in an impregnation tank. A small impregnation tank is added at the front end of the impregnation tank, which contains a fireproof and heat-conducting graphite mixture solution.

7. The manufacturing process of the V-shaped hydrogen storage cylinder for hydrogen fuel cell drones according to claim 1, characterized in that, In step 4), the curing process includes multi-stage temperature control: The first stage is 55℃-65℃, and the temperature is maintained for 50min-70min; The second stage is 85℃-95℃, and the temperature is maintained for 100min-140min; The third stage is 115℃-125℃, and the temperature is maintained for 50min-70min; The fourth stage is at 145℃-155℃, with a holding time of 50-70 minutes; The fifth stage is at 175℃-185℃, with a holding time of 100min-140min; The sixth stage is 20℃-30℃, and the temperature is maintained for 150min-210min.

8. The manufacturing process of the V-shaped hydrogen storage cylinder for hydrogen fuel cell drones according to claim 1, characterized in that, In step 5), the heat-resistant protective layer is a sprayed, room-temperature curing phenolic resin with a thickness of 0.3mm-0.8mm.

9. The manufacturing process of the V-shaped hydrogen storage cylinder for hydrogen fuel cell drones according to claim 1, characterized in that, In step 1), the thickness of the rubber airbag (3) is 4mm-6mm; in step 3), the width of the yarn when the carbon fiber epoxy resin is wound is not less than 10mm.

10. A V-shaped hydrogen storage cylinder for a hydrogen fuel cell drone manufactured using the manufacturing process described in any one of claims 1-9, characterized in that, The hydrogen storage cylinder consists of a rubber airbag (3), a carbon fiber winding layer (4), and a heat-resistant protective layer (5) from the inside out. A support shaft (1) is provided at each end of the hydrogen storage cylinder body, and an inflation / deflation port (6) is provided on the support shaft (1).

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