CN116557750A

CN116557750A - High-pressure hydrogen storage cylinder and preparation method thereof

Info

Publication number: CN116557750A
Application number: CN202310516463.2A
Authority: CN
Inventors: 袁惠清; 袁于洋
Original assignee: Xi'an Ruilin Electronic Technology Co ltd
Current assignee: Xi'an Ruilin Electronic Technology Co ltd
Priority date: 2023-05-09
Filing date: 2023-05-09
Publication date: 2023-08-08

Abstract

The invention provides a high-pressure hydrogen storage cylinder and a preparation method thereof, and relates to the technical field of high-pressure containers. The preparation method comprises the following steps: providing an inner container which is made of plastic materials and is used for bearing high-pressure hydrogen; winding a reinforcing winding belt on the outer side wall of the inner container according to the preset blasting tension of the inner container so as to form a reinforcing layer on the outer side wall of the inner container, wherein the reinforcing winding belt is made of an ultra-high molecular weight polyethylene material; and a supporting layer and a protective layer are sequentially wound on the outer wall of the reinforcing layer to form the high-pressure hydrogen storage cylinder. According to the preparation method of the high-pressure hydrogen storage cylinder, the reinforcing layer is formed on the outer side wall of the inner container, the reinforcing layer is made of the high-molecular polyethylene material, and through the arrangement of the reinforcing layer, the interface bonding strength between the inner container and the supporting layer is increased, the phenomena of buckling, swelling, cracking and the like of the inner container in the process of multiple inflation are prevented, and the safety of the hydrogen storage cylinder is improved.

Description

High-pressure hydrogen storage cylinder and preparation method thereof

Technical Field

The invention relates to the technical field of high-pressure containers, in particular to a high-pressure hydrogen storage cylinder and a preparation method thereof.

Background

Due to the rapid development of industries such as hydrogen fuel cells and new energy automobiles, the use of clean energy is also of great concern, and particularly, hydrogen energy has the characteristics of high heat value, high cleanliness and the like, and is widely applied to the field of new energy. The storage of hydrogen is an important bridge linking the production of hydrogen and the use of hydrogen. The IV type hydrogen storage bottle adopts the plastic liner to store hydrogen, has the characteristics of light weight, low cost, high hydrogen storage mass density and the like, and is widely applied to the environment with higher hydrogen storage requirement.

However, the plastic inner container of the IV-type hydrogen storage cylinder has higher requirements on temperature and external pressure, and the inner container is easy to generate buckling and bulge cracking phenomena, so that the hydrogen storage cylinder is damaged, and hydrogen leakage is caused.

It should be noted that the information of the present invention in the above background section is only for enhancing the understanding of the background of the present invention and thus may include information that does not form the prior art that is already known to those of ordinary skill in the art.

Disclosure of Invention

The invention aims to overcome the defects of the prior art, and provides a high-pressure hydrogen storage cylinder and a preparation method thereof.

Other features and advantages of the invention will be apparent from the following detailed description, or may be learned by the practice of the invention.

According to an aspect of the present invention, there is provided a method of manufacturing a high pressure hydrogen storage cylinder, the method comprising:

providing an inner container which is made of plastic materials and is used for bearing high-pressure hydrogen;

winding a reinforcing winding belt on the outer side wall of the inner container according to the preset blasting tension of the inner container so as to form a reinforcing layer on the outer side wall of the inner container, wherein the reinforcing winding belt is made of an ultra-high molecular weight polyethylene material;

and a supporting layer and a protective layer are sequentially wound on the outer wall of the reinforcing layer to form the high-pressure hydrogen storage cylinder.

In some embodiments of the present invention, based on the foregoing, forming the reinforcement layer on the outer sidewall of the liner includes:

the reinforcement layer is formed by alternately circumferential-winding and spiral-winding the reinforcement winding tape on the outer sidewall of the inner container.

In some embodiments of the present invention, based on the foregoing solution, forming the reinforcement layer on the outer sidewall of the hydrogen storage cylinder liner includes:

the reinforcing winding belt winds the inner container in a reaming winding mode, so that the pressure generated by the reinforcing layer on the outer side wall of the inner container is greater than or equal to the preset blasting tension.

In some embodiments of the present invention, based on the foregoing, when the reinforcing wound tape is spirally wound on the outer sidewall of the liner, a winding tape pitch of the reinforcing wound tape is 2mm to 8mm, and the tape pitch of each spiral winding is different.

In some embodiments of the present invention, based on the foregoing, when the reinforcing wound tape is wound around the liner in a circumferential direction, the winding tape pitch of the reinforcing wound tape is the same.

In some embodiments of the present invention, based on the foregoing, the reinforced wrapping tape employs an epoxy resin system, and the central value of the resin content of the reinforced wrapping tape is 30% to 35%.

In some embodiments of the present invention, based on the foregoing, the supporting layer is a carbon fiber layer, and the supporting layer is wound on an outer wall of the reinforcing layer, including:

the support layer is wound in an alternating mode of circumferential winding and spiral winding, and the support layer is wound in a mode of decreasing tension during winding.

In some embodiments of the invention, the winding tension is decremented by 10N for each 6 layers wound of the support layer based on the foregoing.

In some embodiments of the invention, based on the foregoing, the support layer is wound with the same winding tape pitch in the hoop winding; when the support layer is spirally wound, the winding tape distance of the support layer is 2-8 mm, and the tape distance of each spiral winding is different.

In some embodiments of the present invention, based on the foregoing, the protective layer is a glass fiber layer, and the protective layer is wound on an outer wall of the reinforcing layer, including: and winding the protective layer on the outer side wall of the supporting layer in a circumferential winding and spiral winding alternating winding mode, wherein the tape distance of each winding of the protective layer is the same.

In some embodiments of the invention, based on the foregoing, the method further comprises:

and curing the reinforcing layer, the supporting layer and the protective layer.

According to another aspect of the present invention, there is provided a high-pressure hydrogen storage cylinder comprising the high-pressure hydrogen storage cylinder manufactured using the above manufacturing method.

According to the preparation method of the high-pressure hydrogen storage cylinder, the reinforcing layer is formed on the outer side wall of the inner container, the reinforcing layer and the inner container are good in fit, the reinforcing layer is used for increasing the interlayer bonding strength between the inner container and the supporting layer, on one hand, the strength of the inner container can be increased, and the inner container is prevented from buckling, swelling and cracking and the like after being filled with high-pressure gas for many times; on the other hand, the reinforcing layer is made of ultra-high molecular weight polyethylene material, so that the reinforced gas cylinder has the characteristics of low density, high strength and the like, and after the reinforced gas cylinder is wound on the inner cylinder, the total weight of the gas cylinder is not increased, and the buckling resistance of the inner cylinder can be improved.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention as claimed.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention. It is evident that the drawings in the following description are only some embodiments of the present invention and that other drawings may be obtained from these drawings without inventive effort for a person of ordinary skill in the art.

Fig. 1 is a schematic flow chart of a method for manufacturing a high-pressure hydrogen storage cylinder according to an exemplary embodiment of the invention.

Fig. 2 is a perspective view illustrating a structure of a high pressure hydrogen tank in an exemplary embodiment of the present invention.

Fig. 3 is a cross-sectional view taken along the direction A-A in fig. 2 in an exemplary embodiment of the present invention.

Wherein reference numerals are as follows:

100: an inner container; 200: a reinforcing layer; 300: a support layer; 400: a protective layer; 500: and (3) a joint.

Detailed Description

Example embodiments will now be described more fully with reference to the accompanying drawings. However, the exemplary embodiments can be embodied in many forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the example embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and thus detailed descriptions thereof will be omitted. Furthermore, the drawings are merely schematic illustrations of the present invention and are not necessarily drawn to scale.

Although relative terms such as "upper" and "lower" are used in this specification to describe the relative relationship of one component of an icon to another component, these terms are used in this specification for convenience only, such as in terms of the orientation of the examples described in the figures. It will be appreciated that if the device of the icon is flipped upside down, the recited "up" component will become the "down" component. When a structure is "on" another structure, it may mean that the structure is integrally formed with the other structure, or that the structure is "directly" disposed on the other structure, or that the structure is "indirectly" disposed on the other structure through another structure.

The terms "a," "an," "the," "said" and "at least one" are used to indicate the presence of one or more elements/components/etc.; the terms "comprising" and "having" are intended to be inclusive and mean that there may be additional elements/components/etc. in addition to the listed elements/components/etc.; the terms "first," "second," and "third," etc. are used merely as labels, and do not limit the number of their objects.

The vehicle-mounted hydrogen storage technology is a key for the development of the hydrogen fuel cell automobile, and mainly comprises high-pressure gaseous hydrogen storage, low-pressure liquid hydrogen storage, solid hydrogen storage, organic liquid hydrogen storage and the like, wherein the gaseous hydrogen storage is widely applied due to the characteristics of low cost, mature technology and the like.

At present, the commonly used gaseous hydrogen storage cylinders are a III-type cylinder and an IV-type cylinder, both of which are composed of an inner container and a carbon fiber reinforced composite material layer covered on the inner container, wherein the inner container of the III-type cylinder is a metal inner container, and the inner container of the IV-type cylinder is a plastic inner container, and the plastic inner container is lighter than the metal inner container in weight under the same volume, so that the IV-type cylinder is widely used in vehicle-mounted hydrogen storage technology.

In the related art, the iv-type bottle is generally composed of a plastic liner, a metal joint, a sealing structure and a composite material layer covered on the plastic liner, wherein the composite material layer sequentially comprises a carbon fiber winding layer and an outer protective layer from inside to outside. The liner can be used as a core mold when the composite material layer is wound, and the composite material layer has the functions of protecting the liner and preventing the storage medium from leaking. The forming method of the composite material layer comprises the following steps: after the carbon fiber is pre-impregnated with resin, the carbon fiber is wound around the periphery of the inner container according to a preset layering process, then an outer protective layer is wound around the periphery of the carbon fiber layer, and a composite material layer is formed around the periphery of the inner container after a curing process. The composite material layer is used as a main stress bearing body to provide strength for the IV-type bottle, so that the winding method of the composite material layer influences the overall strength of the hydrogen storage bottle.

When the IV-type bottle prepared by the preparation method is used for circularly inflating and deflating the hydrogen storage bottle, the strength of the composite material layer is insufficient due to the limitation of the preparation method, so that the liner is buckled and swelled, and even the liner is damaged, and hydrogen is leaked.

Therefore, the invention provides the high-pressure hydrogen storage cylinder and the preparation method thereof, which can increase the interlayer bonding strength between the liner and the supporting layer, prevent the liner of the hydrogen storage cylinder from buckling and swelling, and increase the integral strength of the cylinder.

The embodiment of the invention provides a preparation method of a high-pressure hydrogen storage cylinder, as shown in fig. 1, comprising the following steps:

step S10: providing an inner container which is made of plastic materials and is used for bearing high-pressure hydrogen;

step S20: winding a reinforcing winding belt on the outer side wall of the inner container according to the preset blasting tension of the inner container so as to form a reinforcing layer on the outer side wall of the inner container, wherein the reinforcing winding belt is made of an ultra-high molecular weight polyethylene material;

step S30: and sequentially winding a supporting layer and a protective layer on the outer wall of the reinforcing layer to form the high-pressure hydrogen storage cylinder.

According to the preparation method of the high-pressure hydrogen storage cylinder, the reinforcing layer is formed between the inner container and the supporting layer, the interlayer bonding strength between the inner container and the supporting layer is increased through winding of the reinforcing layer, and the reinforcing layer is made of the ultra-high molecular weight polyethylene material, so that the preparation method has the characteristics of low density, high strength and the like, the strength of the cylinder is improved, and the weight of the cylinder is not increased.

The following describes in detail the method for preparing a high-pressure hydrogen storage cylinder according to an embodiment of the present invention with reference to fig. 1 to 3:

as shown in fig. 2, in conjunction with fig. 1, in step S10, a liner 100 is provided, the liner 100 is made of a plastic material, and the liner 100 is used for carrying high-pressure hydrogen. In the high-pressure hydrogen storage cylinder, the inner container 100 is a container that is in direct contact with high-pressure hydrogen gas. Because of the light weight of the plastic material, the liner 100 may be made of the plastic material, and the liner 100 is generally ellipsoidal or spheroid-like. In the embodiment provided by the present invention, the liner 100 may be formed by blow molding using an ethylene-vinyl alcohol copolymer (EVOH) and a High Density Polyethylene (HDPE), wherein the ethylene-vinyl alcohol copolymer (EVOH) layer and the High Density Polyethylene (HDPE) layer may be bonded by an adhesive. In the present invention, the liner 100 may be formed by alternately laminating an ethylene-vinyl alcohol copolymer (EVOH) layer and a High Density Polyethylene (HDPE) layer, or by laminating a plurality of layers of ethylene-vinyl alcohol copolymer (EVOH) and a plurality of layers of High Density Polyethylene (HDPE), and the method of forming the liner 100 and the composition of the film layer may be selected according to the actual use requirements, and the present invention is not limited thereto.

Because hydrogen has high permeability, hydrogen molecules easily permeate through the liner 100 and escape out of the liner 100, so that the liner 100 needs to have proper hydrogen permeability and heat resistance. After the liner 100 is prepared by the method, the liner 100 can be subjected to surface treatment to prevent interfacial delamination between the liner 100 and a film layer wound on the liner 100, for example, the material on the surface of the liner 100 can be modified by flame treatment to increase the roughness of the surface of the liner 100, so as to improve the adhesive force of the surface of the liner 100. Of course, the surface of the liner 100 may be treated by other physical or chemical methods to increase the adhesion, permeation resistance and heat resistance of the liner 100, and the present invention is not limited thereto.

The two ends of the liner 100 are provided with joint connection parts for connecting the joint 500, and the joint 500 is a hydrogen gas charging and discharging channel. The joint connection part has a shape adapted to the joint 500 such that sealability is provided between the joint 500 and the joint connection part to prevent leakage of hydrogen gas flowing through the joint 500 and the joint connection part. In the embodiment provided by the present invention, the joint 500 is generally made of metal, for example, 314 stainless steel, 316 stainless steel or 316L stainless steel may be used, and preferably, the joint 500 may be made of 316L stainless steel to improve the corrosion resistance and strength of the joint 500.

The liner 100 provided in the embodiment of the present invention is the liner 100 having the joint 500, and the liner 100 may be assembled on a high-speed winding machine before the liner 100 is wound with the reinforcing layer 200.

Before the inner container 100 is wound, metal connectors arranged at two ends of the inner container 100 are clamped on a chuck of a high-speed winding machine to fix the inner container 100; the inner container 100 is inflated with a predetermined amount of gas to make the inner container 100 in a inflated state, for example, compressed air of 0.5Mpa to 1.5Mpa may be inflated into the inner container 100 to make the inner container 100 inflated, for example, the compressed air may be 0.5Mpa, 0.7Mpa, 0.9Mpa, 1Mpa, 1.2Mpa, 1.4Mpa or 1.5Mpa. The amount of compressed air filled in the inner container 100 can be adaptively adjusted according to the structure and the capacity of the inner container 100, and the present invention is not particularly limited.

When the inner container 100 is wound with the film, the inner container 100 can be matched with a chuck of a high-speed winding machine, so that the synchronism of the two ends of the inner container 100 during winding is ensured, the deformation deflection of the inner container 100 in the axial direction during winding is reduced, and the forming quality of the gas cylinder is improved. Of course, the liner 100 may be wound by other winding devices, including but not limited to high speed winding machines.

In which, as shown in fig. 2 and 3, in step S20, a reinforcing winding tape is wound on the outer sidewall of the inner container 100 according to a preset burst tension of the inner container 100 to form a reinforcing layer 200 on the outer sidewall of the inner container 100, the reinforcing winding tape being made of Ultra-high molecular weight polyethylene (Ultra-high Molecular Weight Polyethylene, UHMWPE) material. The thermoplastic engineering plastic with excellent comprehensive performance and linear structure of super high molecular weight polyethylene is one kind of linear polyethylene with molecular weight over 150 ten thousand and no branched chain, and has the features of low density, high strength, high modulus, etc. The reinforced tape may be made of ultra-high molecular weight polyethylene fiber bundles, and the fiber bundles may be prepared by a specific method known in the art, wherein the fiber volume content of the reinforced tape may be 50% to 70%, for example, 50%, 55%, 60%, 65% or 70%. The fiber volume content can be selected according to the actual use requirements.

In the present invention, the reinforcing layer 200 is wound on the liner 100 by wet winding, and in order to increase the interlayer bonding strength between the reinforcing layer 200 and the supporting layer 300, an epoxy resin system formulation is generally used for the reinforcing winding tape, wherein the central value of the resin content of the reinforcing winding tape is 30% -35%, for example, 30%, 31.4%, 32%, 33%, 34% or 35%, etc., and the resin content can be selected according to the actual use requirement of the reinforcing winding tape.

The reinforcing wrap is an ultra-high molecular weight polyethylene fiber tape, forming a reinforcing layer 200 on the liner 100, comprising: the reinforcing layer 200 is formed on the liner 100 by alternately circumferential-winding and spiral-winding the reinforcing wound tape on the outer sidewall of the liner 100. Since the outer shape of the inner container 100 may be spherical, ellipsoidal, or spheroid-like, for example, the inner container 100 is spheroid-like in shape having a major axis and a minor axis. The circumferential winding refers to winding the reinforcing layer 200 around the long axis of the liner 100 on the surface of the liner 100 along the long axis of the liner 100; the spiral winding means that when the reinforcing layer 200 is wound on the surface of the inner container 100, a direction in which the winding belt surrounds the inner container 100 has a predetermined angle with the long axis of the inner container 100. When the reinforcing layer 200 is wound around the liner 100, winding in the circumferential direction and winding in the spiral direction are alternately performed in a predetermined line shape.

In the embodiment provided by the invention, in order to reduce the mass redundancy of the reinforcing layer 200, the weight of the gas cylinder is further reduced, the spiral winding and the circumferential winding form a preset winding angle according to the equal strength design theory of the spherical gas cylinder, and the stress generated by the reinforcing winding belt under the action of the load is approximately equal or equal in any direction of the outer wall of the liner 100. The preset winding angle can be adaptively adjusted according to the external shape and the equal strength design theory of the liner 100, and the invention is not particularly limited.

In the design theory of the spherical gas cylinder, the winding of the reinforcing layer 200 on the liner 100 is performed according to a linear track of winding the spherical gas cylinder, the winding track of the spherical gas cylinder is usually divided into two parts along the equator, in order to make the wound gas cylinder have approximately equal or equal strength under the action of the internal pressure, a certain number of enveloping rings need to be wound at the polar hole to meet the strength requirement near the opening of the polar hole, and a certain number of enveloping rings need to be wound at a position lower than the polar hole latitude to meet the strength requirement at the latitude until the wound gas cylinder is wound at the equator.

The winding track of the spherical gas cylinder can be wound according to the non-geodesic track, the wire winding nozzle of the high-speed winding machine moves along the axis direction of the core mold according to the preset speed, the winding angle is the included angle between the non-geodesic winding fiber and the meridian, the main normal line of a curve on the curved surface at each point coincides with the normal line of the same point of the curved surface, and the curve is geodesic; meridian is also called meridian, and is a line connecting two poles on the ground. The non-geodesic track is that the fiber starts from a certain point on the circumference of the pole hole at one end of the container, is wound to a certain tangent point on the circumference of the pole hole at the other end according to the geodesic track, and the total number of turns of the envelope is calculated by adopting an envelope circle reaming scheme, so that stable winding is performed. Wherein the fibers in the container refer to the fibers of the wound tape constituting the reinforcing layer 200, the supporting layer 300 and the protective layer 400 during the winding process.

In the embodiment provided by the present invention, the reinforcing winding tape is wound around the liner 100 in a hole-enlarging winding manner, so that the pressure generated by the reinforcing layer 200 on the outer sidewall of the liner 100 is greater than or equal to the preset burst tension. When the reinforcing layer 200 is wound around the liner 100, the circumferential winding and the spiral winding are alternately performed, and simultaneously, the liner 100 may be wound with the reinforcing winding tape by reaming. Specifically, according to the design theory of equal strength, on each latitudinal circle of the liner 100, the accumulated resistance of the reinforced winding tape when winding the liner 100 needs to be greater than or equal to the tension generated at the position under the burst pressure, so that the protection effect of the reinforcing layer 200 on the liner 100 can be ensured. Taking an IV type gas cylinder as an example, in order to reduce the molding difficulty of the reinforcing layer 200 and the structural risk of the gas cylinder, and reduce the redundant quality, under the condition that the volume of the gas cylinder is 30L (liter), the reaming number is 13, the inner container 100 is spirally and circularly wound in an alternating mode, the winding mode of changing the belt distance is adopted during spiral winding, the winding mode of fixing the belt distance and fixing the tension value during circumferential winding is adopted.

Wherein, when spirally wound, the winding tape distance of the reinforcing winding tape may be 2mm to 8mm, for example, may be 2mm, 2.7mm, 3mm, 4mm, 5mm, 6mm, 7mm or 8mm. The tape pitch of each spiral winding is different, for example, 2mm, 3mm, 4mm and 8mm tape pitches may be used to alternately perform spiral winding.

In the case of hoop winding, the hoop winding tape pitch of the reinforcing wound tape is the same, and for example, hoop winding can be performed with a 3mm tape pitch. Of course, the belt pitch of the reinforcement-wound belt in circumferential winding may be adjusted according to the actual shape and volume of the gas cylinder, and the present invention is not particularly limited. The number of layers wound around in the circumferential direction may be 25 to 35 layers, for example, 25, 28, 31, 33 or 35 layers, depending on the structure of the cylinder. Further, in order to reduce the weight of the gas cylinder structure, the number of layers of the circumferential winding can be 31.

In winding the reinforcing layer 200, the winding may be performed in such a manner that the winding tension is not changed. For example, when the circumferential winding and the spiral winding are alternately performed, the tension per winding may be in the range of 100N (N) to 120N (N), and the tension per winding may be equal, for example, the winding tension may be 100N, 105N, 110N, 115N, or 120N.

The thickness of the reinforcing layer 200 needs to satisfy the preset bursting tension of the liner 100, the interlayer bonding strength between the subsequent liner 100 and the support layer 300, and the mass redundancy of the whole gas cylinder is avoided, and in the present invention, the layer thickness of the reinforcing layer 200 may be 0.5mm to 1.5mm, for example, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm or 1.5mm, preferably, may be 1mm.

After the reinforcing layer 200 is wound around the liner 100, the reinforcing layer 200 may be cured in order to prevent the liner 100 from being deformed due to the tension of the reinforcing wound tape. For example, a form of vacuum-pumping, heating, pressurizing and curing may be adopted, specifically, the liner 100 after winding the reinforcing layer 200 may be put into a high-temperature hot-pressing tank for curing, the vacuum degree may be-0.09 Mpa (megapascals), the curing temperature may be 250 ℃ (celsius) to 400 ℃ (celsius), the pressurizing point may be 350 ℃, the curing pressure may be 0.1Mpa to 1Mpa, so as to form the cured reinforcing layer 200, and the compactness and the molding quality of the cured reinforcing layer 200 are improved.

In which, as shown in fig. 2 and 3, in step S30, the support layer 300 and the protective layer 400 are sequentially wound on the outer wall of the reinforcement layer 200 to form a high pressure hydrogen storage cylinder. The support layer 300 is typically made of carbon fiber, which is a fibrous carbon material. The material of the support layer 300 is selected according to parameters such as the bearing pressure of the gas cylinder, the preset bursting strength, the temperature resistance level, etc., for example, the support layer 300 may be made of one or more of high modulus carbon fibers such as T700 carbon fibers, T800 carbon fibers, and T1000 carbon fibers. The support layer 300 may be formulated with an epoxy system to meet the performance requirements of the support layer 300. The central value of the resin content of the supporting layer 300 is 30% -35%, for example, 30%, 31.4%, 32%, 33%, 34% or 35%, and the resin content may be selected according to the actual use requirement of the reinforcing layer 200. The fiber volume content of the support layer 300 may be 50% to 70%, for example, 50%, 55%, 60%, 65% or 70%. The fiber volume content can be selected according to the actual use requirements.

Wrapping the support layer 300 around the outer wall of the reinforcement layer 200 includes: the support layer 300 is wound in an alternating circumferential winding and spiral winding manner, and the support layer 300 is wound in a decreasing tension manner during the winding. In order to prevent the support layer 300 from winding wrinkles or loosening due to the accumulation of tension when the support layer 300 is wound, the support layer 300 is wound in a manner of decreasing tension. In some embodiments, the winding tension is decremented by 10N for each 6 layers of support layer 300. For example, the support layer 300 is initially wound at a tension of 100N, and after each winding of 6 layers, the tension is decreased by 10N, and after winding of 24 layers, the tension is decreased to 70N.

When the support layer 300 is wound in a circumferential direction, the winding tape pitch used for the support layer 300 is the same. When the support layer 300 is spirally wound, the winding tape pitch of the support layer 300 is 2mm to 8mm, for example, may be 2mm, 2.7mm, 3mm, 4mm, 5mm, 6mm, 7mm or 8mm, and the tape pitch is different every time the spiral is wound. For example, the support layer 300 is wound in a winding form of 12 spiral windings and 12 circumferential windings alternately, wherein the tape pitch used for 12 circumferential windings is 3mm, the tape pitch used for the first 6 spiral windings is 4mm, and the tape pitch used for the last 6 spiral windings is 8mm.

The compression rating and strength of the support layer 300 are satisfied when the support layer 300 is wound up to a certain thickness, wherein the thickness of the support layer 300 may be 25mm to 30mm, for example, 25mm, 26mm, 27mm, 28mm, 29mm or 30mm. Preferably, the thickness of the support layer 300 is 28mm.

After the reinforcement layer 200 is wound around the support layer 300, the support layer 300 may be cured in order to further fix the support layer 300 and reduce the winding wrinkles and looseness of the support layer 300. For example, a form of vacuum-pumping, heating, pressurizing and curing may be adopted, specifically, the liner 100 after the supporting layer 300 is wound may be put into a high-temperature hot-pressing tank for curing, the vacuum degree may be-0.09 Mpa (megapascal), the curing temperature may be 250 ℃ (celsius) to 400 ℃ (celsius), the pressurizing point may be 350 ℃, the curing pressure may be 0.1Mpa to 1Mpa, so as to form the cured supporting layer 300, and the compactness and the molding quality of the cured supporting layer 300 are improved.

After forming the support layer 300, the protective layer 400 is wound around the outside of the support layer 300, and the protective layer 400 may be made of a material having characteristics of high strength, corrosion resistance, moist heat resistance, etc., and for example, the protective layer 400 may be made of glass fiber. Wherein, the protective layer 400 adopts an epoxy resin system formula to improve the interlayer bonding degree between the protective layer 400 and the supporting layer 300.

When the protective layer 400 is wound, the protective layer 400 is wound on the outer sidewall of the support layer 300 in a circumferential winding and spiral winding alternating manner, and the tape pitch of each winding of the protective layer 400 is identical, i.e., when the protective layer 400 is wound, the tape pitch of the circumferential winding is identical to the tape pitch of the spiral winding. The tape pitch may be 2mm to 8mm, for example, may be 2mm, 3mm, 4mm, 5mm, 6mm, 7mm or 8mm, and preferably may be 6mm.

Since the protective layer 400 protects the liner 100, the reinforcing layer 200, and the support layer 300, the protective layer 400 needs to have a certain thickness, but an excessively thick protective layer 400 increases the total mass of the gas cylinder, and thus the protective layer 400 needs to have a moderate thickness. The thickness of the protective layer 400 may be 0.5mm to 1mm, and may be, for example, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, or 1mm. The thickness of the protective layer 400 can be selected according to the actual design requirements of the gas cylinder.

After the formation of the protective layer 400, the protective layer 400 needs to be subjected to a curing treatment to increase the compactness of the protective layer 400. For example, a form of vacuum-pumping, heating, pressurizing and curing may be adopted, specifically, the liner 100 after the protective layer 400 is wound may be put into a high-temperature hot-pressing tank for curing, the vacuum degree may be-0.09 Mpa (megapascal), the curing temperature may be 250 ℃ (celsius) to 400 ℃ (celsius), the pressurizing point may be 350 ℃, the curing pressure may be 0.1Mpa to 1Mpa, so as to form the cured protective layer 400, and the compactness and the molding quality of the cured protective layer 400 are improved.

The winding angles of the spiral direction winding in the reinforcement layer 200, the support layer 300 and the protection layer 400 may be selected according to the actual design requirements of the gas cylinder, and the present invention is not particularly limited.

After the reinforcement layer 200, the support layer 300 and the protection layer 400 are wound on the liner 100, the overall structure of the gas cylinder can be checked to ensure that the winding of each film layer meets the design strength of the gas cylinder. The checking process is as follows: inflating the gas cylinder to a preset design pressure; the gas cylinder which is inflated is deflated at the fastest deflation rate, so that the pressure in the gas cylinder is reduced to the atmospheric pressure, and the surface temperature of the gas cylinder in the deflation process is not lower than-40 ℃; in a normal temperature environment, after the gas cylinder is kept still for 5 hours, the gas cylinder is pressurized to the design pressure and kept for 24 hours; the above-described inflation and deflation cycles are repeated a predetermined number of times to verify the degree of buckling of the inner container 100 of the gas cylinder.

According to the high-pressure hydrogen storage bottle, the reinforcing layer 200, the supporting layer 300 and the protective layer 400 are sequentially formed on the outer side wall of the liner 100 according to the preset blasting tension, wherein the reinforcing layer 200 is made of an ultra-high molecular weight polyethylene material, and the interlayer bonding strength between the liner 100 and the supporting layer 300 can be increased through the arrangement of the reinforcing layer 200; on the other hand, the reinforcing layer 200 designed according to the equal strength design theory has better fit with the surface of the liner 100, and the accumulated resistance of the reinforcing layer 200 at each part of the liner 100 is larger than the preset bursting tension of the part of the liner 100, so as to prevent the liner 100 from buckling, swelling and other problems under the action of tension; in yet another aspect, the reinforcing layer 200 may increase the number of times the gas cylinder is recycled, improve the molding quality of the gas cylinder, and increase the yield of the gas cylinder.

Example 1

Table 1 shows specific process parameters of each film winding of the gas cylinder in the specific embodiment provided by the invention.

TABLE 1

In combination with the data given in table 1, the winding patterns for the reinforcing layer 200, the supporting layer 300 and the protective layer 400 were all wound in a circumferential winding and spiral winding alternating manner, and three windings and three curing patterns were used to increase the structural strength of each film layer. Of course, the specific data presented in table 1 are merely exemplary, and may be adaptively adjusted according to various parameters of a specific design requirement during actual manufacturing of the gas cylinder.

Example two

Table 2 shows the winding process parameters of each film layer of the type iv hydrogen cylinder in the specific example provided by the present invention.

TABLE 2

In combination with the data given in table 2, for a type iv hydrogen cylinder, the liner 100 is a plastic liner 100, the overall design pressure is 157.5MPa, the winding modes of the reinforcing layer 200, the supporting layer 300 and the protecting layer 400 are all combined by adopting the circumferential winding and the spiral winding, and the process parameters of the reinforcing layer 200, the supporting layer 300 and the protecting layer 400 are determined according to the design pressure, so that the liner 100 cannot generate buckling and swelling phenomena under the condition of repeated circulating inflation and deflation of the type iv hydrogen cylinder, and the cylinder has a longer service life.

It should be noted that although the steps of the method for producing a high-pressure hydrogen storage cylinder of the present invention are depicted in the drawings in a particular order, this is not required or implied that these steps must be performed in that particular order or that all of the illustrated steps must be performed in order to achieve the desired results. Additionally or alternatively, certain steps may be omitted, multiple steps combined into one step to perform, and/or one step decomposed into multiple steps to perform, etc.

The embodiment of the invention provides a high-pressure hydrogen storage cylinder, which is manufactured by the manufacturing method, as shown in fig. 2 and 3. The high-pressure hydrogen storage cylinder comprises an inner container 100, and a reinforcing layer 200, a supporting layer 300 and a protective layer 400 which are sequentially formed on the outer side wall of the inner container 100, wherein the reinforcing layer 200 is made of ultra-high molecular weight polyethylene materials.

The specific structure and preparation process of the high-pressure hydrogen storage cylinder are described above, and are not repeated here.

The high-pressure hydrogen storage cylinder provided by the invention has the advantages that the reinforcing layer 200 is additionally arranged, so that the overall structural strength of the cylinder is improved, the cylinder has durability, and the liner 100 can not generate buckling and bulge cracking phenomena in the process of repeated circulation inflation and deflation.

Other embodiments of the invention will be apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the invention and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the invention being indicated by the following claims.

Claims

1. The preparation method of the high-pressure hydrogen storage cylinder is characterized by comprising the following steps of:

2. The method of manufacturing a high pressure hydrogen storage cylinder according to claim 1, wherein forming the reinforcement layer on the outer sidewall of the inner container comprises:

3. The method of manufacturing a high pressure hydrogen storage cylinder according to claim 2, wherein forming the reinforcing layer on the outer sidewall of the hydrogen storage cylinder liner comprises:

4. The method for manufacturing a high-pressure hydrogen storage cylinder according to claim 2, wherein when the reinforcing winding tape is spirally wound on the outer side wall of the inner container, the winding tape pitch of the reinforcing winding tape is 2mm to 8mm, and the tape pitch of each spiral winding is different.

5. The method for manufacturing a high-pressure hydrogen storage cylinder according to claim 1, wherein when the reinforcing wrapping tape is wound around the inner container in a circumferential direction, a wrapping tape pitch of the reinforcing wrapping tape is the same.

6. The method for manufacturing a high-pressure hydrogen storage cylinder according to claim 1, wherein the reinforced wrapping tape is an epoxy resin system, and the central value of the resin content of the reinforced wrapping tape is 30% -35%.

7. The method for manufacturing a high-pressure hydrogen storage cylinder according to claim 1, wherein the support layer is a carbon fiber layer, the support layer is wound on an outer wall of the reinforcement layer, comprising:

8. The method for manufacturing a high-pressure hydrogen storage cylinder according to claim 7, wherein the winding tension is decreased by 10N every time the support layer is wound by 6 layers.

9. The method for manufacturing a high-pressure hydrogen storage cylinder according to claim 8, wherein the support layer is wound with the same winding tape pitch in the circumferential winding; when the support layer is spirally wound, the winding tape distance of the support layer is 2-8 mm, and the tape distance of each spiral winding is different.

10. The method for manufacturing a high-pressure hydrogen storage cylinder according to claim 1, wherein the protective layer is a glass fiber layer, and the protective layer is wound on the outer wall of the reinforcing layer, comprising: and winding the protective layer on the outer side wall of the supporting layer in a circumferential winding and spiral winding alternating winding mode, wherein the tape distance of each winding of the protective layer is the same.

11. The method of manufacturing a high pressure hydrogen storage cylinder as claimed in claim 1, further comprising:

12. A high-pressure hydrogen storage cylinder, characterized by comprising the high-pressure hydrogen storage cylinder manufactured by the manufacturing method according to any one of claims 1 to 11.