70 MPa basalt fiber type IV hydrogen storage cylinder and manufacturing method thereof

Abstract

The invention belongs to the technical field of hydrogen energy automobiles, and relates to a 70 MPa basalt fiber four-type hydrogen storage cylinder and a manufacturing method thereof, the 70 MPa basalt fiber four-type hydrogen storage cylinder comprises an inner container, and the outer layer of the inner container is coated with a thermoplastic buffer layer; a basalt fiber winding layer is wound outside the thermoplastic buffer layer; an anti-static layer is arranged outside the basalt fiber winding layer, and bottle opening assemblies of a double-sealing structure are arranged at the two ends of the inner container. The application of the basalt fiber greatly reduces the weight, improves the energy efficiency and endurance mileage of the hydrogen energy automobile, and reduces the transportation energy consumption. The cost of the basalt fiber raw material is about 30%-50% lower than that of the carbon fiber, the manufacturing cost of the hydrogen storage cylinder is remarkably reduced, and popularization of hydrogen energy automobiles is accelerated. And the thermoplastic buffer layer is arranged between the inner container and the basalt fiber winding layer, so that the problem of interface layering possibly caused by large difference of thermal expansion coefficients of metal and non-metal materials is solved, the integrity of the whole bottle body structure is enhanced, and the bottle body structure is still stable and reliable under the working conditions of long-term hydrogen charging and discharging circulation and temperature and pressure alternation.

Description

Technical Field

[0001] The present invention belongs to the technical field of hydrogen-powered vehicles and relates to a 70 MPa basalt fiber type IV hydrogen storage cylinder and a manufacturing method thereof. Background Art

[0002] Hydrogen-powered vehicles, a key trend in future green mobility, are attracting widespread attention and research worldwide. In this field, high-performance hydrogen storage cylinders are crucial for achieving long vehicle range and high efficiency. However, existing hydrogen storage technologies still face numerous challenges, particularly in cylinder materials and structural design.

[0003] In the early stages of hydrogen vehicle development, metal hydrogen cylinders were widely adopted due to their mature manufacturing process and relatively low cost. However, the inherent weight of metal materials severely limited the vehicle's energy efficiency and range. For example, while steel hydrogen cylinders are sturdy and durable, they weigh significantly more per liter than lighter materials. This directly reduces the payload of hydrogen vehicles, which in turn affects driving range and energy efficiency. Furthermore, metal cylinders are susceptible to corrosion in high-pressure hydrogen environments. Aluminum alloys, in particular, can suffer from hydrogen embrittlement after prolonged exposure to hydrogen, reducing the cylinder's safety and service life. To address these shortcomings of metal hydrogen cylinders, carbon fiber reinforced composite (CFRP) cylinders have emerged. CFRP, with its light weight, high strength, and corrosion resistance, is theoretically well-suited for high-pressure hydrogen storage applications. However, high manufacturing costs have been a major obstacle to their large-scale commercialization. The high production cost of carbon fiber, coupled with the complex winding and curing processes, makes CFRP hydrogen cylinders far beyond the reach of ordinary consumers. This cost constraint has significantly limited the expansion of the hydrogen vehicle market and the speed of technological adoption. Structural design is a critical factor for any type of hydrogen cylinder. While ensuring the pressure-bearing capacity of gas cylinders, it is also necessary to solve the interface connection problem between metal and composite materials. Traditional gas cylinders often ignore the differences in thermal expansion coefficients of different materials under temperature and pressure changes. As a result, during long-term use, interface delamination may occur between the metal liner and the outer composite layer, thus affecting the overall performance and safety of the gas cylinder. In addition, the vibration and impact faced by gas cylinders during the hydrogen filling and discharging process are also one of the factors that must be considered during design. This requires that the gas cylinders not only have sufficient strength, but also have a certain impact resistance to adapt to the complex and changing use environment.

[0004] Existing metal hydrogen storage cylinders, due to weight and corrosion resistance limitations, struggle to meet the high-performance hydrogen storage requirements of hydrogen vehicles. While carbon fiber composite cylinders can effectively reduce weight and increase pressure-bearing capacity, their high manufacturing costs hinder the commercialization of hydrogen vehicles. In cylinder structural design, interface issues between metal and composite materials, as well as insufficient impact resistance, further limit their performance in practical applications. Therefore, developing a hydrogen storage cylinder that can maintain pressure-bearing capacity while also being lightweight, cost-effective, and safe to use has become a core technical challenge urgently needed to be addressed in the hydrogen vehicle industry. Summary of the Invention

[0005] The purpose of the present invention is to provide a 70 MPa basalt fiber type IV hydrogen storage cylinder and a manufacturing method to solve the technical problem that metal hydrogen storage cylinders in the existing technology are difficult to meet the requirements of hydrogen-powered vehicles for high-performance hydrogen storage devices due to limitations in weight and corrosion resistance.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions: In the first aspect, the present application discloses a 70 MPa basalt fiber type IV hydrogen storage cylinder, comprising: an inner liner, the outer layer of the inner liner is coated with a thermoplastic buffer layer; a basalt fiber winding layer is wrapped around the thermoplastic buffer layer; an anti-static layer is provided outside the basalt fiber winding layer, and a bottle mouth assembly with a double sealing structure is provided at both ends of the inner liner.

[0007] Preferably, the inner liner is made of a lightweight metal alloy material and is formed by spin forming.

[0008] Preferably, the thermoplastic buffer layer is a thiol coupling agent coating.

[0009] Preferably, the basalt fiber winding layer is formed by winding basalt fiber bundles, and the basalt fiber bundles are impregnated with epoxy resin.

[0010] Preferably, the bottle mouth assembly includes a stop valve, a metal sealing gasket and an elastic rubber seal are provided between the stop valve and the bottle mouth, and a pressure sensor for monitoring the pressure in the bottle is provided on the stop valve.

[0011] Preferably, the antistatic layer is made of polyurea material.

[0012] In a second aspect, the present application also discloses a method for manufacturing a 70 MPa basalt fiber type IV hydrogen storage cylinder, comprising: The liner is prepared by a spin forming process; The outer layer of the liner is coated with a thermoplastic buffer layer; The basalt fiber tow is wound around the thermoplastic buffer layer to obtain a basalt fiber winding layer; The outer layer of the basalt fiber winding layer is coated with an anti-static layer; bottle mouth components are installed at both ends of the inner liner.

[0013] Preferably, the preparation of the liner by the spin forming process is specifically as follows: After the sheet is cut to the preset size and shape, it is placed on the mold of the spinning machine. The spinning machine applies radial and axial pressure to the sheet to obtain the inner liner.

[0014] Preferably, the basalt fiber tow is wound around the thermoplastic buffer layer to obtain the basalt fiber winding layer, specifically: The basalt fiber tow is impregnated in the epoxy resin matrix until the basalt fiber tow is evenly impregnated; The wet winding process is used to evenly lay the evenly impregnated basalt fiber tows in a hoop winding manner; After the hoop winding is completed, axial winding is performed to obtain a basalt fiber winding layer.

[0015] Preferably, the spacing between the hoop winding layers is 0.5-1 mm, and the spacing between adjacent axially wound tows is evenly distributed; the deviation between the starting angles of the hoop winding and the axial winding is within 1°.

[0016] Compared with the prior art, the present invention has the following beneficial effects: Compared to traditional metal gas cylinders, this application utilizes a basalt fiber wrapping layer. The use of basalt fiber significantly reduces weight, improves the energy efficiency and range of hydrogen vehicles, and reduces transportation energy consumption. The raw material cost of basalt fiber is approximately 30%-50% lower than that of carbon fiber, significantly reducing the manufacturing cost of hydrogen storage cylinders and accelerating the popularization of hydrogen vehicles. A thermoplastic buffer layer is placed between the inner liner and the basalt fiber wrapping layer. One end of the thermoplastic buffer layer chemically bonds with the metal inner liner surface, while the other end closely adheres to the epoxy resin matrix of the basalt fiber wrapping layer. This eliminates the interfacial delamination issue that can occur between metal and non-metallic materials due to large differences in thermal expansion coefficients, strengthens the integrity of the entire cylinder structure, and ensures the cylinder remains stable and reliable under long-term hydrogen charging and discharging cycles and fluctuating temperature and pressure conditions. A weather-resistant polymer protective coating made of polyurea is applied over the basalt fiber wrapping layer to protect against external factors such as impact, UV rays, and humidity fluctuations, preventing fiber aging and extending the service life of the cylinder.

[0017] Furthermore, the inner liner is made of lightweight metal alloy, and aluminum alloy is an ideal choice. Aluminum alloy has the characteristics of low density and good ductility. While ensuring a certain mechanical strength, it minimizes the weight of the bottle body. The forming process of the inner liner adopts spin forming. First, the aluminum alloy sheet is cut to the appropriate size and shape, and then accurately placed on the mold of the spinning machine. As the main shaft of the spinning machine rotates at high speed, radial and axial pressure is applied to the sheet through the spinning wheel, so that the sheet gradually fits the inner cavity of the mold, and finally a seamless, high-precision inner liner structure is formed. This forming process not only ensures the uniform wall thickness of the inner liner, but also gives it excellent airtightness, laying a solid foundation for subsequent high-pressure hydrogen storage.

[0018] Furthermore, the bottle mouth seal adopts a double-seal structure, with a metal sealing gasket and elastic rubber seal, which effectively prevents micro-leakage of hydrogen. The bottle mouth valve integrates a high-precision pressure sensor and a shut-off valve. The pressure sensor monitors the pressure inside the bottle in real time. If the pressure is abnormal, the shut-off valve quickly closes to ensure safe use.

[0019] Furthermore, a wet winding process is used to first impregnate the basalt fiber bundles into a prepared epoxy resin matrix. The epoxy resin acts as a binder here, which can not only tightly connect the fiber bundles, but also fill the gaps between the fibers to optimize stress transfer. When winding, it is first started in a circumferential winding manner, precisely controlling the tension and spacing of the bundles, evenly stacking multiple layers of fiber, and building the main pressure-bearing structure. This is followed by axial winding, in which the axial fibers act as a "skeleton" to enhance the overall tensile strength of the bottle, with alternating circumferential and axial layouts, layer by layer. After multiple rounds of winding until the designed fiber layer thickness is reached, the overall pressure limit of the bottle is raised to 70 MPa, allowing it to easily cope with high-pressure hydrogen environments. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0021] Figure 1 Schematic diagram of the structure of an embodiment of the present invention.

[0022] Among them: 1- liner; 2- thermoplastic buffer layer; 3- basalt fiber winding layer; 4- antistatic layer; 5- label area. DETAILED DESCRIPTION

[0023] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0024] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention as claimed, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort are intended to fall within the scope of protection of the present invention.

[0025] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not require further definition or explanation in subsequent drawings.

[0026] In the description of the embodiments of the present invention, it should be noted that if the terms "upper," "lower," "horizontal," "inner," etc. appear, the orientation or positional relationship indicated is based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the inventive product is typically placed when in use. These terms are merely for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. In addition, the terms "first," "second," etc. are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0027] In addition, if the term "horizontal" appears, it does not mean that the component must be absolutely horizontal, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0028] In the description of the embodiments of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "disposed," "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0029] The present invention is described in further detail below with reference to the accompanying drawings: See also Figure 1The present application discloses a 70 MPa basalt fiber type IV hydrogen storage cylinder, comprising: an inner liner 1, the outer layer of the inner liner 1 is coated with a thermoplastic buffer layer 2; a basalt fiber winding layer 3 is wrapped around the thermoplastic buffer layer 2; an antistatic layer 4 is provided outside the basalt fiber winding layer 3, and a bottle mouth assembly with a double sealing structure is provided at both ends of the inner liner 1.

[0030] In some embodiments, the inner liner 1 is made of a lightweight metal alloy material and is formed by spin forming; when selecting a lightweight metal alloy, aluminum alloy is an ideal choice. Aluminum alloy has the characteristics of low density and good ductility, which can minimize the weight of the bottle while ensuring a certain mechanical strength. The forming process of the inner liner adopts spin forming. First, the aluminum alloy sheet is cut to the appropriate size and shape, and then accurately placed on the mold of the spinning machine. As the main shaft of the spinning machine rotates at high speed, radial and axial pressure is applied to the sheet through the spinning wheel, so that the sheet gradually fits the inner cavity of the mold, and finally a seamless, high-precision inner liner structure is formed. This forming process not only ensures the uniform wall thickness of the inner liner, but also gives it excellent airtightness, laying a solid foundation for subsequent high-pressure hydrogen storage.

[0031] In some embodiments, the thermoplastic buffer layer 2 is a thiol coupling agent coating. A further thermoplastic buffer layer 2 is positioned between the metal liner and the basalt fiber winding layer. This thermoplastic buffer layer 2 is made from a special coupling agent coating that chemically bonds with the metal liner surface at one end and maintains a close affinity with the epoxy resin matrix at the other. This solves the interfacial delamination issue that can arise from the large difference in thermal expansion coefficients between metal and non-metallic materials, strengthens the integrity of the entire bottle structure, and ensures its stability and reliability under long-term hydrogen charging and discharging cycles and fluctuating temperature and pressure conditions. The thermoplastic buffer layer 2 in the bottle structure design plays an indispensable "bridge" role. Positioned between the metal liner and the basalt fiber winding layer, it plays a crucial role in ensuring overall structural stability. The thermoplastic buffer layer 2 is a thiol coupling agent coating, the composition of which has been carefully formulated, with one end bearing active functional groups that chemically react with the metal liner surface. When the outer layer of the aluminum alloy liner is coated with the thermoplastic buffer layer 2, these active groups will chemically bond with the oxide film naturally formed on the aluminum surface. This chemical bond is strong and stable, like countless tiny "anchor points", firmly fixing the thermoplastic buffer layer 2 on the metal liner. On the other end, the molecular structure of the thermoplastic buffer layer 2 is adapted to the epoxy resin matrix and exhibits good affinity. The epoxy and hydroxyl groups in the epoxy resin can interact with the corresponding groups of the coupling agent coating to form physical entanglement and weak chemical bonds. During the subsequent wet winding of the basalt fiber, the fiber bundle impregnated with epoxy resin can use this affinity to seamlessly connect with the thermoplastic buffer layer 2, thereby establishing a tight bonding state.

[0032] In some embodiments, the basalt fiber winding layer 3 is formed by winding basalt fiber bundles, and the basalt fiber bundles are impregnated with epoxy resin. The epoxy resin acts as a binder, which can not only tightly connect the fiber bundles, but also fill the gaps between the fibers to optimize stress transfer.

[0033] In some embodiments, the bottle mouth assembly includes a shutoff valve with a metal sealing gasket and an elastic rubber seal positioned between the shutoff valve and the bottle mouth. The shutoff valve is equipped with a pressure sensor for monitoring the pressure within the bottle. The bottle mouth seal utilizes a double-seal structure, with the metal sealing gasket and the elastic rubber seal effectively preventing micro-leaks of hydrogen. The bottle mouth valve integrates a high-precision pressure sensor with the shutoff valve. The pressure sensor monitors the pressure within the bottle in real time. If the pressure is abnormal, the shutoff valve quickly closes to ensure safe use.

[0034] In some embodiments, the antistatic layer 4 is made of polyurea material, which can resist adverse factors such as external impact, ultraviolet rays, and humidity changes, prevent fiber aging, and extend the service life of the gas cylinder.

[0035] The present application also discloses a method for manufacturing a 70 MPa basalt fiber type IV hydrogen storage cylinder, comprising: Prepare the liner 1 by a spin forming process; The outer layer of the liner 1 is coated with a thermoplastic buffer layer 2; The thermoplastic buffer layer 2 is wound around a basalt fiber tow to obtain a basalt fiber winding layer 3; The outer layer of the basalt fiber winding layer 3 is coated with an antistatic layer 4; and bottle mouth components are installed at both ends of the inner liner 1.

[0036] In some embodiments, the liner 1 is prepared by the spin forming process as follows: After the sheet is cut to the desired size and shape, it is placed in the die of a spinning machine, which applies radial and axial pressure to the sheet to form the inner liner 1. As the spinning machine's spindle rotates at high speed, the spinning wheel applies radial and axial pressure to the sheet, gradually fitting it into the mold cavity, ultimately creating a seamless, high-precision inner liner structure. This molding process not only ensures uniform wall thickness but also imparts excellent airtightness, laying a solid foundation for subsequent high-pressure hydrogen storage.

[0037] In some embodiments, the thermoplastic buffer layer 2 is wrapped with basalt fiber tow to obtain the basalt fiber winding layer 3, specifically: The basalt fiber tow is impregnated in the epoxy resin matrix until the basalt fiber tow is evenly impregnated; The wet winding process is used to evenly lay the evenly impregnated basalt fiber tows in a hoop winding manner; After the hoop winding is completed, axial winding is performed to obtain a basalt fiber winding layer 3.

[0038] Using a wet winding process, the basalt fiber bundles are first impregnated in a prepared epoxy resin matrix. The epoxy resin acts as a binder here, which can not only tightly connect the fiber bundles, but also fill the gaps between the fibers to optimize stress transfer. When winding, it is first started in a circumferential winding mode, precisely controlling the tension and spacing of the bundles, evenly stacking multiple layers of fiber, and building the main pressure-bearing structure. This is followed by axial winding, in which the axial fibers act as a "skeleton" to enhance the overall tensile strength of the bottle. The circumferential and axial directions are arranged alternately, layer by layer. After multiple rounds of winding until the designed fiber layer thickness is reached, the overall pressure limit of the bottle is raised to 70 MPa, allowing it to easily cope with high-pressure hydrogen environments.

[0039] In some embodiments, the spacing between the circumferential winding layers of the circumferential winding is 0.5-1 mm, and the spacing between adjacent bundles of the axial winding is evenly distributed; the starting angle deviation of the circumferential winding and the axial winding is within 1°. When using a high-precision fiber winding machine, the accuracy of its mechanical transmission components is crucial. The servo motor is equipped with a precision reducer to accurately control the speed and displacement of the bundle conveying, and to control the axial and circumferential motion errors to an extremely small range, such as controlling the position deviation of a single bundle to no more than 0.1 mm. In addition, the winding machine is equipped with a high-precision tension sensor to provide real-time feedback on the fiber tension, maintain stable output, avoid uneven tightness of the bundle due to tension fluctuations, and ensure uniform and smooth winding.

[0040] In some embodiments, suitable impregnation equipment is used to ensure uniform epoxy resin impregnation of the basalt fibers. For example, when using a tank impregnation method, the tank is equipped with an efficient stirring and circulation system to ensure that the epoxy resin maintains a uniform viscosity and composition distribution. The adhesive maintains a steady flow rate and an appropriate liquid level over the fiber tow, preventing localized adhesive shortages or adhesive accumulation. This ensures that each fiber is evenly coated with the matrix, paving the way for subsequent uniform winding and avoiding winding defects caused by uneven impregnation.

[0041] In some embodiments, the spacing and number of tow layers for both circumferential and axial winding are precisely calculated based on parameters such as cylinder size and design pressure. Finite element analysis is first performed to simulate the stress distribution of the cylinder under different operating conditions to determine the optimal tow arrangement. The spacing between each circumferential winding layer is set at 0.5-1 mm, and adjacent axial tows are evenly spaced. The starting winding angle and speed are also carefully matched, with the starting angle deviation controlled within 1°. A stable winding speed prevents tow stacking or sparseness, ensuring uniform winding.

[0042] In some embodiments, a visual monitoring system is installed during the winding process. High-definition cameras capture the winding image from all directions and, using image recognition algorithms, analyze the fiber tow alignment in real time to ensure uniformity and compliance. Any deviations detected are immediately fed back to the winding machine control system, which automatically adjusts winding parameters to promptly correct any unevenness and ensure consistent quality throughout the entire basalt fiber winding layer.

[0043] In some embodiments, the starting winding angle is determined through preliminary simulations and experiments, which determines the initial distribution of fibers in the axial and circumferential directions of the cylinder. Using a 70 MPa hydrogen storage cylinder as an example, finite element analysis software simulated the stresses acting on the cylinder and found that a starting winding angle of 30°-60° resulted in a more uniform stress distribution, balancing circumferential compression and axial tension. This starting angle is strictly maintained throughout the winding process, with deviations controlled within ±1°. The winding angles of each subsequent layer are also gradually varied to build a balanced fiber network and avoid uneven winding caused by localized stress concentration. Accurately calculated tow spacing can avoid uneven fiber density. Targeted spacing is determined for different cylinder sections, such as the cylinder body, shoulder, and base. In the main cylinder body, the circumferential tow spacing is typically set at 0.5-1 mm, while the axial spacing between adjacent tows is determined based on the cylinder diameter and the fiber tow width, ensuring that adjacent tows are seamlessly stacked without being excessively distant, achieving uniform coverage. Near stress-complex areas such as the bottle mouth and bottom, the spacing is fine-tuned to increase fiber density and enhance local strength. The number of basalt fiber winding layers is planned based on the cylinder's design pressure and load-bearing requirements. A 70 MPa high-pressure hydrogen storage cylinder requires a sufficient number of layers to share the pressure. This number is estimated theoretically and then verified through physical testing. For example, a preliminary estimate of 15-20 layers is made. Sample bottles are manufactured to test actual pressure and deformation, and the precise number of layers is gradually optimized. The thickness of each layer increases evenly, creating a stable and regular winding system. An appropriate winding speed is selected and maintained constant throughout the process to avoid speed fluctuations that disrupt fiber alignment. Winding too quickly can result in insufficient fiber spread and poor adhesion between tows, while winding too slowly can lead to over-impregnation of the adhesive, affecting subsequent winding. Taking into account fiber impregnation and winding machine performance, a stable speed, typically 3-5 meters per minute, is selected to allow the fiber tows to accumulate layer by layer in an orderly manner, ensuring uniform winding.

[0044] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A 70 MPa basalt fiber type IV hydrogen storage cylinder, characterized in that: include: An inner liner (1) is coated with a thermoplastic buffer layer (2) on its outer layer; a basalt fiber winding layer (3) is wound around the outer layer of the thermoplastic buffer layer (2); an antistatic layer (4) is provided on the outer layer of the basalt fiber winding layer (3); and bottle mouth components with a double sealing structure are provided at both ends of the inner liner (1).

2. A 70 MPa basalt fiber type IV hydrogen storage cylinder according to claim 1, characterized in that: The inner liner (1) is made of a light metal alloy material and is formed by spin forming.

3. A 70 MPa basalt fiber type IV hydrogen storage cylinder according to claim 1, characterized in that: The thermoplastic buffer layer (2) is a mercapto coupling agent coating.

4. A 70 MPa basalt fiber type IV hydrogen storage cylinder according to claim 1, characterized in that: The basalt fiber winding layer (3) is formed by winding basalt fiber bundles, and the basalt fiber bundles are impregnated with epoxy resin.

5. The 70 MPa basalt fiber type IV hydrogen storage cylinder according to claim 1, characterized in that: The bottle mouth assembly includes a stop valve, a metal sealing gasket and an elastic rubber sealing member are arranged between the stop valve and the bottle mouth, and a pressure sensor for monitoring the pressure in the bottle is arranged on the stop valve.

6. The 70 MPa basalt fiber type IV hydrogen storage cylinder according to claim 1, characterized in that: The antistatic layer (4) is made of polyurea material.

7. A method for manufacturing a 70 MPa basalt fiber type IV hydrogen storage cylinder according to any one of claims 1 to 6, characterized in that: include: Prepare the liner (1) by a spin forming process; The outer layer of the liner (1) is coated with a thermoplastic buffer layer (2); The thermoplastic buffer layer (2) is wrapped with basalt fiber bundles to obtain a basalt fiber winding layer (3); The outer layer of the basalt fiber winding layer (3) is coated with an antistatic layer (4); and bottle mouth components are installed at both ends of the inner liner (1).

8. The method for manufacturing a 70 MPa basalt fiber type IV hydrogen storage cylinder according to claim 7, characterized in that: The method of preparing the inner liner (1) by the spin forming process is specifically as follows: After the sheet is cut to a preset size and shape, it is placed on a die of a spinning machine, and the spinning machine applies radial and axial pressure to the sheet to obtain an inner liner (1).

9. The method for manufacturing a 70 MPa basalt fiber type IV hydrogen storage cylinder according to claim 7, characterized in that: The thermoplastic buffer layer (2) is wrapped with basalt fiber bundles to obtain a basalt fiber winding layer (3), specifically: The basalt fiber tow is impregnated in the epoxy resin matrix until the basalt fiber tow is evenly impregnated; The wet winding process is used to evenly lay the evenly impregnated basalt fiber tows in a hoop winding manner; After the circumferential winding is completed, axial winding is performed to obtain a basalt fiber winding layer (3).

10. The method for manufacturing a 70 MPa basalt fiber type IV hydrogen storage cylinder according to claim 9, characterized in that: The spacing between the hoop winding layers is 0.5-1 mm, and the spacing between adjacent axial winding tows is evenly distributed; the deviation between the starting angles of hoop winding and axial winding is within 1°.

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