High-pressure hydrogen storage cylinder and method for manufacturing the same

Abstract

The application 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, the inner container is made of plastic material, and the inner container is used for bearing high-pressure hydrogen; according to a preset burst tension of the inner container, a reinforcing winding belt is wound on the outer side wall of the inner container to form a reinforcing layer on the outer side wall of the inner container, and the reinforcing winding belt is made of ultrahigh molecular weight polyethylene material; and a support layer and a protective layer are sequentially wound on the outer wall of the reinforcing layer to form the high-pressure hydrogen storage cylinder.The preparation method of the high-pressure hydrogen storage cylinder provided by the application forms a reinforcing layer on the outer side wall of the inner container, the reinforcing layer is made of high molecular polyethylene material, the interface bonding strength between the inner container and the support layer is increased through the arrangement of the reinforcing layer, the inner container is prevented from being bent and bulging and cracking in the process of multiple inflation, and the safety of the hydrogen storage cylinder is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of high-pressure containers, in particular to a high-pressure hydrogen storage cylinder and a preparation method thereof. BACKGROUND

[0002] With the rapid development of hydrogen fuel cells and new energy vehicles, the use of clean energy has also attracted much attention, especially hydrogen energy, which has the characteristics of high calorific value and high cleanliness, and is widely used in the field of new energy. Hydrogen storage is an important bridge connecting hydrogen production and hydrogen use. Type IV hydrogen storage cylinders use plastic liners to store hydrogen, have the characteristics of light weight, low cost and high hydrogen storage mass density, and are widely used in environments with high hydrogen storage requirements.

[0003] However, the plastic liner of the type IV hydrogen storage cylinder has high requirements for temperature and external pressure, and the liner is prone to buckling and bulging and cracking, which can cause damage to the hydrogen storage cylinder and cause hydrogen leakage.

[0004] It should be noted that the information disclosed in the above background section of the application is only used to strengthen the understanding of the background of the present application, and therefore can include information that does not constitute prior art known to those of ordinary skill in the art. SUMMARY

[0005] The purpose of the present application is to overcome the shortcomings of the prior art, and to provide a high-pressure hydrogen storage cylinder and a preparation method thereof. The hydrogen storage cylinder prepared by the method has good interlayer bonding strength between the composite material layer and the liner and between each film layer in the composite material covering the liner, which avoids buckling and bulging and cracking of the liner.

[0006] Other characteristics and advantages of the present application will become apparent from the following detailed description, or will be learned by practice of the present application.

[0007] According to one aspect of the present application, a preparation method of a high-pressure hydrogen storage cylinder is provided, the method comprising:

[0008] providing a liner made of a plastic material, the liner being used to carry high-pressure hydrogen;

[0009] According to a preset burst tension of the liner, a reinforcing wrapping tape is wound on the outer sidewall of the liner to form a reinforcing layer on the outer sidewall of the liner, the reinforcing wrapping tape being made of an ultra-high molecular weight polyethylene material;

[0010] a support layer and a protective layer are sequentially wound on the outer wall of the reinforcing layer to form the high-pressure hydrogen storage cylinder.

[0011] In some embodiments of the present application, based on the foregoing scheme, the reinforcing layer is formed on the outer sidewall of the liner, comprising:

[0012] The reinforcing layer is formed by alternately winding the reinforcing winding tape in a circumferential direction and a helical direction on the outer sidewall of the liner.

[0013] In some embodiments of the present application, based on the foregoing scheme, the reinforcing layer is formed on the outer sidewall of the liner of the hydrogen storage cylinder, comprising:

[0014] The reinforcing winding tape is wound on the liner by a reaming winding method, so that the pressure generated by the reinforcing layer on the outer sidewall of the liner is greater than or equal to the preset burst tension.

[0015] In some embodiments of the present application, based on the foregoing scheme, when the reinforcing winding tape is wound in a helical direction on the outer sidewall of the liner, the winding tape pitch of the reinforcing winding tape is 2mm-8mm, and the tape pitch of each helical winding is different.

[0016] In some embodiments of the present application, based on the foregoing scheme, when the reinforcing winding tape is wound in a circumferential direction on the liner, the winding tape pitch of the reinforcing winding tape is the same.

[0017] In some embodiments of the present application, based on the foregoing scheme, the reinforcing winding tape adopts an epoxy resin system, and the central value of the resin content of the reinforcing winding tape is 30%-35%.

[0018] In some embodiments of the present application, based on the foregoing scheme, the support layer is a carbon fiber layer, and the support layer is wound on the outer wall of the reinforcing layer, comprising:

[0019] The winding of the support layer is performed in an alternating manner of circumferential winding and helical winding, and the support layer is wound in a manner of decreasing tension during winding.

[0020] In some embodiments of the present application, based on the foregoing scheme, the winding tension of the support layer decreases by 10N every 6 layers of winding.

[0021] In some embodiments of the present application, based on the foregoing scheme, when wound in a circumferential direction, the winding tape pitch of the support layer is the same; when wound in a helical direction, the winding tape pitch of the support layer is 2mm-8mm, and the tape pitch of each helical winding is different.

[0022] In some embodiments of the present application, based on the foregoing scheme, the protective layer is a glass fiber layer, and the protective layer is wound on the outer wall of the reinforcing layer, comprising: the protective layer is wound on the outer sidewall of the support layer in an alternating winding manner of circumferential winding and helical winding, and the tape pitch of each winding of the protective layer is the same.

[0023] In some embodiments of the present application, based on the foregoing scheme, the method further comprises:

[0024] The reinforcing layer, the supporting layer and the protective layer are subjected to a curing treatment.

[0025] According to another aspect of the present application, there is provided a high-pressure hydrogen storage cylinder prepared by the method.

[0026] The method for preparing a high-pressure hydrogen storage cylinder provided by the present application forms a reinforcing layer on the outer sidewall of the inner liner, and the reinforcing layer has good adhesion with the inner liner. The reinforcing layer is used to increase the interlayer bonding strength between the inner liner and the supporting layer, which can increase the strength of the inner liner and prevent the inner liner from being buckled and bulging and cracking after being repeatedly filled with high-pressure gas. In addition, the reinforcing layer is made of ultra-high molecular weight polyethylene material, which has the characteristics of low density and high strength. After winding the inner liner, the total weight of the cylinder is not increased, and the buckling resistance of the inner liner is increased.

[0027] It should be understood that the foregoing general description and the following detailed description are only exemplary and explanatory, and cannot limit the present application. BRIEF DESCRIPTION OF DRAWINGS

[0028] The drawings incorporated into the specification and forming a part thereof, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the application. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor on the basis of these drawings.

[0029] Figure 1 A flowchart of a method for preparing a high-pressure hydrogen storage cylinder in an exemplary embodiment of the present application.

[0030] Figure 2 A perspective view of a structure of a high-pressure hydrogen storage cylinder in an exemplary embodiment of the present application.

[0031] Figure 3 A perspective view of a structure of a high-pressure hydrogen storage cylinder in an exemplary embodiment of the present application. Figure 2 A cross-sectional view of A-A in FIG.

[0032] In which, the reference signs are explained as follows:

[0033] 100: inner liner; 200: reinforcing layer; 300: supporting layer; 400: protective layer; 500: joint. DETAILED DESCRIPTION

[0034] Example implementations will now be described more fully with reference to the accompanying drawings. Example implementations can be implemented in any numerous ways, and example implementations should not be construed as limited to having been set forth in the description herein; rather, descriptions are provided so that this disclosure will be complete and fully convey the concepts of example implementations to those skilled in the art. Identical reference numerals may have been used, so far as possible, to designate identical elements that are common to the figures. Further, the figures are merely schematic and viewed from different perspectives for ease of illustration and understanding.

[0035] Although relative terms such as "upper", "lower", etc. are used herein to describe one component's relationship to another component of the icon, these terms are used herein for ease of description only and are not intended to limit the scope of the disclosure. It is to be understood that if the icon were turned over, such that the "upper" component were now a "lower" component, the disclosure would function in the same manner. When a structure is "on" another structure, it can mean that the structure is formed integrally with the other structure or that the structure is "directly" on the other structure or that the structure is "indirectly" on the other structure via another structure.

[0036] The terms "a", "an", "the" and "at least one" are used to express existence of one or more elements / components / etc.; the terms "comprising" and "having" are used to express an open-ended inclusion of one or more elements / components / etc. in the description of a process, a method, an article, a creation, a composition, a device, a product, etc.; and the terms "first", "second", and "third", etc. are merely used to identify important or key components, and are not limiting on the number of components.

[0037] Vehicle hydrogen storage technology is the key to the development of hydrogen fuel cell vehicles, and vehicle hydrogen storage technology mainly includes high-pressure gaseous hydrogen storage, low-pressure liquid hydrogen storage, solid hydrogen storage and organic liquid hydrogen storage, etc. Among them, gaseous hydrogen storage is widely used due to its low cost and mature technology.

[0038] At present, the commonly used gaseous hydrogen storage cylinders are type III cylinders and type IV cylinders, both of which are composed of an inner container and a carbon fiber reinforced composite material layer covering the inner container. The inner container of the type III cylinder is a metal inner container, and the inner container of the type IV cylinder is a plastic inner container. Under the same volume, the plastic inner container is lighter than the metal inner container, so the type IV cylinder is widely used in vehicle hydrogen storage technology.

[0039] In the related art, the Type IV bottle is usually composed of a plastic liner, a metal joint, a sealing structure, and a composite layer covering the plastic liner, the composite layer comprising, from inside to outside, a carbon fiber winding layer and an outer protective layer. The liner can be used as a core mold when winding the composite layer, and the composite layer has the function of protecting the liner and preventing the storage medium from leaking. The forming method of the composite layer comprises: after the carbon fiber is pre-impregnated with resin, the carbon fiber is wound around the outer periphery of the liner according to a predetermined layering process, and then an outer protective layer is wound around the outer periphery of the carbon fiber layer, and after a curing process, a composite layer is formed on the outer periphery of the liner. The composite layer serves as the main force bearing body and provides strength for the Type IV bottle, and therefore, the winding method of the composite layer affects the overall strength of the hydrogen storage cylinder.

[0040] The Type IV bottle prepared by the above preparation method has insufficient strength of the composite layer due to the limitation of the preparation method, resulting in buckling and bulging of the liner, and even damage to the liner, causing hydrogen leakage when the hydrogen storage cylinder is subjected to cyclic charging and discharging.

[0041] Therefore, the present application provides a high-pressure hydrogen storage cylinder and a preparation method thereof, which can increase the interlayer bonding strength between the liner and the support layer, prevent the liner of the hydrogen storage cylinder from buckling and bulging, and increase the overall strength of the cylinder.

[0042] The present application provides a preparation method for a high-pressure hydrogen storage cylinder, as shown in Figure 1 The preparation method comprises the following steps:

[0043] Step S10: providing a liner made of plastic material, the liner being used to bear high-pressure hydrogen gas;

[0044] Step S20: winding a reinforcing winding tape on the outer side wall of the liner according to a preset burst tension of the liner to form a reinforcing layer on the outer side wall of the liner, the reinforcing winding tape being made of ultra-high molecular weight polyethylene material;

[0045] Step S30: winding a support layer and a protective layer on the outer wall of the reinforcing layer in sequence to form a high-pressure hydrogen storage cylinder.

[0046] The preparation method for a high-pressure hydrogen storage cylinder provided by the present application forms a reinforcing layer between the liner and the support layer, increases the interlayer bonding strength between the liner and the support layer through the winding of the reinforcing layer, and the reinforcing layer is made of ultra-high molecular weight polyethylene material, which has the characteristics of low density and high strength, improves the strength of the cylinder, and does not increase the weight of the cylinder.

[0047] The following will be described in conjunction with the accompanying Figure 1 to the accompanying Figure 3 The preparation method for a high-pressure hydrogen storage cylinder provided by the present application will be described in detail:

[0048] As shown in Figure 2 illustrated, in combination Figure 1 In step S10, a liner 100 is provided, which is made of plastic material and is used to carry high-pressure hydrogen. In a high-pressure hydrogen storage cylinder, the liner 100 is a container that directly contacts the high-pressure hydrogen. Due to the light weight of the plastic material, the liner 100 can be made of plastic material, and the liner 100 is usually ellipsoidal or ellipsoidal. In the embodiments provided by the present application, the liner 100 can be formed by blow molding using ethylene-vinyl alcohol copolymer (EVOH) and high-density polyethylene (HDPE), and the ethylene-vinyl alcohol copolymer (EVOH) layer and the high-density polyethylene (HDPE) layer can be connected by adhesive. In the present application, the liner 100 can be formed in the form of alternating layers of one layer of ethylene-vinyl alcohol copolymer (EVOH) and one layer of high-density polyethylene (HDPE), or multiple layers of ethylene-vinyl alcohol copolymer (EVOH) and multiple layers of high-density polyethylene (HDPE). The forming method of the liner 100 and the composition of the film layer can be selected according to the actual use requirements, and the present application does not make specific limitations.

[0049] Due to the high permeability of hydrogen, hydrogen molecules can easily escape from the liner 100. Therefore, the liner 100 needs to have appropriate hydrogen permeability and heat resistance. After the liner 100 is prepared by the above method, the liner 100 can be surface treated to prevent interfacial delamination between the liner 100 and the film layer wound thereon. For example, the surface material of the liner 100 can be modified by flame treatment to increase the roughness of the surface of the liner 100, thereby improving the adhesion of the surface of the liner 100. Of course, the surface of the liner 100 can also be treated by other physical or chemical methods to increase the adhesion, impermeability and heat resistance of the liner 100, and the present application does not make specific limitations.

[0050] A joint connecting portion is provided at both ends of the liner 100, which is used to connect a joint 500, which is a channel for hydrogen charging and discharging. The joint connecting portion has a shape that is adapted to the joint 500, so that the joint 500 and the joint connecting portion have sealing property, preventing hydrogen flowing through the joint 500 and the joint connecting portion from leaking. In the embodiments provided by the present application, the joint 500 is usually made of metal, for example, 314 stainless steel, 316 stainless steel or 316L stainless steel, preferably, the joint 500 can be made of 316L stainless steel to improve the corrosion resistance and strength of the joint 500.

[0051] The inner liner 100 provided in this embodiment of the invention is an inner liner 100 with a connector 500. Before the reinforcing layer 200 is wound on the inner liner 100, the inner liner 100 can be assembled on a high-speed winding machine. The following embodiments of the invention use the inner liner 100 and the connector 500 connection form as an example for illustration, but the preparation method provided by the invention is not limited to the above-described inner liner 100 structure.

[0052] Before winding the inner liner 100, the metal connectors at both ends of the inner liner 100 are clamped onto the chuck of the high-speed winding machine to fix the inner liner 100. A preset amount of gas is then introduced into the inner liner 100 to inflate it. For example, compressed air of 0.5 MPa to 1.5 MPa can be introduced into the inner liner 100 to inflate it. For example, the compressed air can be 0.5 MPa, 0.7 MPa, 0.9 MPa, 1 MPa, 1.2 MPa, 1.4 MPa, or 1.5 MPa. The amount of compressed air introduced into the inner liner 100 can be adjusted adaptively according to the structure and capacity of the inner liner 100, and this invention does not impose a specific limitation.

[0053] When winding the inner liner 100, the inner liner 100 can be used in conjunction with the chuck of a high-speed winding machine to ensure the synchronicity of the two ends of the inner liner 100 during winding, reduce the axial deformation and deflection of the inner liner 100 during winding, and improve the forming quality of the gas cylinder. Of course, the inner liner 100 can also be wound using other equipment with winding capabilities, including but not limited to high-speed winding machines.

[0054] Among them, such as Figure 2 and Figure 3 As shown, in step S20, according to the preset burst tension of the inner liner 100, a reinforcing winding tape is wound around the outer wall of the inner liner 100 to form a reinforcing layer 200 on the outer wall of the inner liner 100. The reinforcing winding tape is made of ultra-high molecular weight polyethylene (UHMWPE). UHMWPE is a linear thermoplastic engineering plastic with excellent comprehensive performance. It is an unbranched linear polyethylene with a molecular weight of over 1.5 million, characterized by low density, high strength, and high modulus. The reinforcing winding tape can be made of UHMWPE fiber bundles. The specific preparation method of the fiber bundles can adopt techniques known in the art. The fiber volume content of the reinforcing winding tape can be 50% to 70%, for example, 50%, 55%, 60%, 65%, or 70%. The fiber volume content can be selected according to actual usage requirements.

[0055] In the present application, the reinforcing layer 200 is wound on the inner container 100 by a wet winding method. In order to increase the interlayer bonding strength between the reinforcing layer 200 and the supporting layer 300, the reinforcing winding belt is usually made of an epoxy resin system. The central value of the resin content of the reinforcing winding belt is 30% to 35%, for example, it can be 30%, 31.4%, 32%, 33%, 34% or 35%, etc. The resin content can be selected according to the actual use requirements of the reinforcing winding belt.

[0056] The reinforcing winding belt is an ultra-high molecular weight polyethylene fiber belt. The reinforcing layer 200 is formed on the inner container 100 by alternately winding the reinforcing winding belt on the outer wall of the inner container 100 in a circumferential direction and a helical direction. Since the shape of the inner container 100 can be spherical, ellipsoidal or ellipsoidal-like, for example, the inner container 100 is ellipsoidal in shape and has a major axis and a minor axis. The circumferential winding refers to winding the reinforcing layer 200 on the inner container 100 along the major axis of the inner container 100. The helical winding refers to winding the reinforcing layer 200 on the surface of the inner container 100, and the direction of the winding belt around the inner container 100 has a predetermined angle with the major axis of the inner container 100. When winding the reinforcing layer 200 on the inner container 100, the circumferential and helical winding is alternately performed according to a predetermined line type.

[0057] In the embodiments provided by the present application, in order to reduce the mass redundancy of the reinforcing layer 200 and further reduce the weight of the gas cylinder, according to the strength design theory of spherical gas cylinders, the helical winding and the circumferential winding have a predetermined winding angle. In any direction on the outer wall of the inner container 100, the stress generated by the reinforcing winding belt under the action of the load is approximately equal or equal. The predetermined winding angle can be adaptively adjusted according to the shape of the inner container 100 and the strength design theory, which is not limited in the present application.

[0058] In the design theory of spherical gas cylinders, the winding of the reinforcing layer 200 on the inner container 100 is performed according to the winding line trajectory of the spherical gas cylinder. The winding trajectory of the spherical gas cylinder is usually divided into two parts along the equator as a reference. In order to make the wound gas cylinder have approximately equal or equal strength under the action of internal pressure, a certain number of envelope circles are first wound at the polar hole to meet the strength requirement near the opening of the polar hole. Then, a certain number of envelope circles are wound at a lower latitude than the polar hole to meet the strength requirement at this latitude, until the equator is reached.

[0059] The spherical gas cylinder winding track can be wound according to a non-geodesic line track, the winding nozzle of the high-speed winding machine moves along the axis direction of the mandrel at a preset speed, and the winding angle is the included angle between the non-geodesic line wound fiber and the meridian. The principal normal of a curve on a surface coincides with the normal of the same point on the surface at each point, and this curve is a geodesic line. The meridian is also called a prime vertical, which is a line connecting the two poles on the ground. The non-geodesic line track is that the fiber is wound from a certain point on the circumference of the container end polar hole to a certain tangent point on the circumference of the other end polar hole according to the geodesic line track, the envelope circle expanding hole scheme is adopted, the total number of envelopes is calculated, and stable winding is performed. Among them, the fiber in the container refers to the fiber of the winding belt constituting the reinforcing layer 200, the supporting layer 300 and the protective layer 400 in the winding process.

[0060] In the specific embodiments provided by the present application, the reinforcing winding belt is wound on the inner container 100 in the expanding hole winding mode, so that the pressure generated by the reinforcing layer 200 on the outer sidewall of the inner container 100 is greater than or equal to the preset burst tension. When the reinforcing layer 200 is wound on the inner container 100, the expanding hole winding of the reinforcing winding belt can be performed on the inner container 100 at the same time while the hoop and spiral winding is alternately performed. Specifically, according to the equal strength design theory, the cumulative resistance of the reinforcing winding belt when winding the inner container 100 needs to be greater than or equal to the tension generated at this position under the burst pressure on each latitude circle of the inner container 100, so as to ensure the protection of the inner container 100 by the reinforcing layer 200. Taking a type IV gas cylinder as an example, in order to reduce the forming difficulty of the reinforcing layer 200 and reduce the gas cylinder structure risk and reduce the redundant mass, when the gas cylinder volume is 30L (liter), the expanding hole number is 13, the spiral and hoop winding is alternately performed on the inner container 100, the variable pitch winding is adopted in the spiral winding, and the fixed pitch winding is adopted in the hoop winding, and the winding mode with fixed tension value.

[0061] Among them, in the spiral winding, the winding pitch of the reinforcing winding belt can be 2mm-8mm, for example, it can be 2mm, 2.7mm, 3mm, 4mm, 5mm, 6mm, 7mm or 8mm. The pitch of each spiral winding is different, for example, the pitches of 2mm, 3mm, 4mm and 8mm can be alternately used for spiral winding.

[0062] In the hoop winding, the hoop winding pitch of the reinforcing winding belt is the same, for example, the pitch of 3mm can be used for hoop winding. Of course, the pitch of the reinforcing winding belt in the hoop winding can also be adjusted according to the actual shape and volume of the gas cylinder, which is not limited in the present application. According to the structure of the gas cylinder, the number of layers of the hoop winding can be 25-35 layers, for example, it can be 25 layers, 28 layers, 31 layers, 33 layers or 35 layers. Further, in order to reduce the weight of the gas cylinder structure, the number of layers of the hoop winding can be 31 layers.

[0063] When the reinforcing layer 200 is wound, the winding tension can be constant. For example, when the hoop winding and the spiral winding are alternately performed, the tension of each layer can be in the range of 100 N (Newton) to 120 N (Newton), and the tension of each winding is equal, for example, the winding tension can be 100 N, 105 N, 110 N, 115 N or 120 N.

[0064] The thickness of the reinforcing layer 200 needs to meet the preset burst tension of the liner 100, needs to meet the interlayer bonding strength between the subsequent liner 100 and the support layer 300, and avoids the mass redundancy of the whole gas cylinder, in the present application, the thickness of the reinforcing layer 200 can be 0.5 mm to 1.5 mm, for example, it can be 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1 mm, 1.1 mm, 1.2 mm, 1.3 mm, 1.4 mm or 1.5 mm, preferably, it can be 1 mm.

[0065] After the above-mentioned reinforcing layer 200 is wound on the liner 100, in order to prevent the liner 100 from being deformed under the action of the tension of the reinforcing winding belt, the reinforcing layer 200 can be cured. For example, the vacuum heating and pressurization curing form can be used, specifically, the liner 100 after winding the reinforcing layer 200 can be put into a high temperature hot press tank for curing, the vacuum degree can be-0.09 Mpa (mega pascal), the curing temperature can be 250 ℃ to 400 ℃, the pressurization point can be 350 ℃, and the curing pressure can be 0.1 Mpa to 1 Mpa, to form the cured reinforcing layer 200, the cured reinforcing layer 200 improves the density and forming quality of itself.

[0066] Among them, as Figure 2 and Figure 3As shown, in step S30, the support layer 300 and the protective layer 400 are sequentially wound on the outer wall of the reinforcing layer 200 to form the high-pressure hydrogen storage cylinder. The support layer 300 is usually made of carbon fiber, which is a fibrous carbon material. The material of the support layer 300 is selected according to the parameters such as the bearing pressure, the preset burst strength, and the temperature resistance level of the cylinder. For example, the support layer 300 can be made of one or more of high-modulus carbon fibers such as T700 carbon fiber, T800 carbon fiber, and T1000 carbon fiber. The support layer 300 can be made of an epoxy resin system formulation to meet the performance requirements of the support layer 300. The central value of the resin content of the support layer 300 is 30% to 35%, for example, it can be 30%, 31.4%, 32%, 33%, 34%, or 35%, and the resin content can be selected according to the actual use requirements of the reinforcing layer 200. The fiber volume content of the support layer 300 can be 50% to 70%, for example, it can be 50%, 55%, 60%, 65%, or 70%. The fiber volume content can be selected according to the actual use requirements.

[0067] Winding the support layer 300 on the outer wall of the reinforcing layer 200 includes: winding the support layer 300 in an alternating manner of circumferential winding and spiral winding, and the support layer 300 is wound in a decreasing tension manner. In order to prevent the support layer 300 from being wound with wrinkles or loose due to the accumulation of tension during winding, the support layer 300 is wound in a decreasing tension manner. In some embodiments, the winding tension of the support layer 300 decreases by 10N every 6 layers. For example, the initial winding tension of the support layer 300 is 100N, and after every 6 layers, the tension decreases by 10N, and after 24 layers, the tension decreases to 70N.

[0068] When the support layer 300 is circumferentially wound, the support layer 300 adopts the same winding band distance. When the support layer 300 is spirally wound, the support layer 300 winding band distance is 2mm to 8mm, for example, it can be 2mm, 2.7mm, 3mm, 4mm, 5mm, 6mm, 7mm, or 8mm, and the band distance is different every time the support layer 300 is spirally wound. For example, the circumferential winding can adopt a 3mm band distance, and the spiral winding can adopt a 4mm and 8mm band distance. For example, the support layer 300 winding includes 12 times of spiral winding and 12 times of circumferential winding in an alternating manner, wherein the 12 times of circumferential winding adopts a 3mm band distance, the first 6 times of spiral winding adopts a 4mm band distance, and the last 6 times of spiral winding adopts an 8mm band distance. This winding method of the support layer 300 can avoid the phenomenon of uneven stress during winding.

[0069] When the support layer 300 is wound to a certain thickness, the compression resistance and strength of the support layer 300 are met, wherein the thickness of the support layer 300 can be 25mm-30mm, for example, can be 25mm, 26mm, 27mm, 28mm, 29mm or 30mm. Preferably, the thickness of the support layer 300 is 28mm.

[0070] After the support layer 300 is wound on the reinforcing layer 200 as described above, in order to further fix the support layer 300 and reduce the winding wrinkles and looseness of the support layer 300, the support layer 300 can be cured. For example, a vacuum heating and pressurization curing form can be used, specifically, the inner container 100 after winding the support layer 300 can be placed in a high temperature hot press tank for curing, the vacuum degree can be-0.09Mpa (mega pascal), the curing temperature can be 250°C-400°C, the pressurization point can be 350°C, and the curing pressure can be 0.1Mpa-1Mpa, to form the cured support layer 300, which improves the density and forming quality of the support layer 300 itself.

[0071] After the support layer 300 is formed, the protective layer 400 is wound on the outside of the support layer 300, and the protective layer 400 can be made of materials with high strength, corrosion resistance, moisture resistance and other properties, for example, the protective layer 400 can be made of glass fiber. The protective layer 400 uses an epoxy resin system formula to improve the interlayer bonding degree between the protective layer 400 and the support layer 300.

[0072] When winding the protective layer 400, the protective layer 400 is wound on the outer wall of the support layer 300 in a way of alternating winding of the circumferential direction and the spiral direction, and the belt pitch of each winding of the protective layer 400 is the same, that is, the belt pitch of the circumferential direction and the belt pitch of the spiral direction are the same when winding the protective layer 400. The belt pitch can be 2mm-8mm, for example, can be 2mm, 3mm, 4mm, 5mm, 6mm, 7mm or 8mm, preferably, can be 6mm.

[0073] Since the protective layer 400 protects the inner container 100, the reinforcing layer 200 and the support layer 300, the protective layer 400 needs to have a certain thickness, but the protective layer 400 that is too thick will increase the total mass of the cylinder, therefore, the protective layer 400 needs to have a moderate thickness. The thickness of the protective layer 400 can be 0.5mm-1mm, for example, can be 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 cylinder.

[0074] After the protective layer 400 is formed, the protective layer 400 needs to be cured to increase the density of the protective layer 400. For example, a vacuum heating and pressurization curing mode can be used, specifically, the liner 100 wrapped with the protective layer 400 can be placed in a high-temperature autoclave for curing, the vacuum degree can be-0.09 MPa (mega pascal), the curing temperature can be 250°C (degrees Celsius) to 400°C (degrees Celsius), the pressurization point can be 350°C, and the curing pressure can be 0.1 MPa to 1 MPa, to form the cured protective layer 400, which improves the density and forming quality of the protective layer 400.

[0075] The winding angle of the spiral winding in the above-mentioned reinforcing layer 200, support layer 300 and protective layer 400 can be selected according to the actual design requirements of the gas cylinder, and the present application does not make specific limitations.

[0076] After the above-mentioned reinforcing layer 200, support layer 300 and protective 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: the gas cylinder is inflated to a preset design pressure; the inflated gas cylinder is deflated at the fastest deflation rate, so that the pressure in the gas cylinder is reduced to atmospheric pressure, and the surface temperature of the gas cylinder during deflation is not lower than-40°C; after the gas cylinder is static for 5h (hours) in a normal temperature environment, the gas cylinder is pressurized to the design pressure and maintained for 24h; the above-mentioned inflation and deflation cycle is repeated to a preset number of times to check the bending degree of the liner 100 of the gas cylinder.

[0077] The high-pressure hydrogen storage cylinder provided by the present application forms a reinforcing layer 200, a support layer 300 and a protective layer 400 on the outer side wall of the liner 100 according to a preset burst tension, wherein the reinforcing layer 200 is made of ultra-high molecular weight polyethylene material, and the setting of the reinforcing layer 200 can increase the interlayer bonding strength between the liner 100 and the support layer 300. On the other hand, the reinforcing layer 200 designed according to the equal strength design theory has good adhesion with the surface of the liner 100, and the cumulative resistance of the reinforcing layer 200 in each part of the liner 100 is greater than the preset burst tension of the part of the liner 100, so as to prevent the liner 100 from bending and bulging under the action of tension. The setting of the reinforcing layer 200 can improve the number of cycles of the gas cylinder, improve the forming quality of the gas cylinder, and improve the yield of the gas cylinder.

[0078] Example one

[0079] Table 1 shows the specific process parameters of the winding of each film layer of the gas cylinder in the specific embodiment provided by the present application.

[0080]

[0081]

[0082] Table 1

[0083] In combination with the data given in Table 1, the winding mode of the reinforcing layer 200, the supporting layer 300 and the protective layer 400 is the alternating winding mode of the hoop winding and the spiral winding, and the three winding and three curing mode is adopted to increase the structural strength of each film layer. Of course, the specific data given in Table 1 is only exemplary, and in the actual manufacturing process of the gas cylinder, each parameter can be adjusted according to the specific design requirements.

[0084] Example Two

[0085] Table 2 is the winding process parameters of each film layer of the type IV hydrogen cylinder in the specific embodiment provided by the present application.

[0086]

[0087]

[0088] Table 2

[0089] In combination with the data given in Table 2, for the type IV hydrogen cylinder, the inner liner 100 is a plastic inner liner 100, the overall design pressure is 157.5 MPa, and the winding mode of the reinforcing layer 200, the supporting layer 300 and the protective layer 400 is the combination of the hoop winding and the spiral winding, and the process parameters of the reinforcing layer 200, the supporting layer 300 and the protective layer 400 are determined according to the design pressure, so that the inner liner 100 of the type IV hydrogen cylinder does not occur buckling and bulging phenomenon under the condition of multiple cycle charging and discharging, and such gas cylinder has a long service life.

[0090] It should be noted that although the steps of the method for preparing the high-pressure hydrogen storage cylinder in the present application are described in a specific order in the accompanying drawings, this does not require or imply that the steps must be performed in this specific order, or that all the steps shown must be performed to achieve the desired result. In addition or alternatively, some steps can be omitted, a plurality of steps can be combined into one step, and / or one step can be divided into a plurality of steps, etc.

[0091] The present application provides a high-pressure hydrogen storage cylinder, which is manufactured by the above manufacturing method, as shown in Figure 2 and Figure 3 The high-pressure hydrogen storage cylinder comprises an inner liner 100, and a reinforcing layer 200, a supporting layer 300 and a protective layer 400 formed in sequence on the outer side wall of the inner liner 100, and the reinforcing layer 200 is made of ultra-high molecular weight polyethylene material.

[0092] The specific structure and preparation process of the high-pressure hydrogen storage cylinder are as described above, and will not be described here again.

[0093] The high-pressure hydrogen storage cylinder provided by the application improves the overall structural strength of the cylinder by additionally arranging the reinforcing layer 200, and the cylinder has durability, and the inner container 100 will not be bent and cracked in the process of repeated charging and discharging.

[0094] Other embodiments of the application will be apparent to those skilled in the art from consideration of the specification and practice of the application disclosed herein. It is intended that the specification and examples be considered as exemplary only, with the true scope and spirit of the application being indicated by the following claims.

Claims

1. A method for preparing a high-pressure hydrogen storage cylinder, characterized in that, include: An inner liner is provided, the inner liner being made of plastic material, the inner liner being used to hold high-pressure hydrogen gas; the surface material of the inner liner is modified by flame treatment to increase the surface roughness of the inner liner; According to the preset bursting tension of the inner liner, a reinforcing wrapping tape is wound around the outer wall of the inner liner to form a reinforcing layer on the outer wall of the inner liner. The reinforcing wrapping tape is made of ultra-high molecular weight polyethylene material. The reinforcing layer is formed by alternately winding the reinforcing wrapping tape around the outer wall of the inner liner in a circumferential and helical manner. A support layer and a protective layer are sequentially wound around the outer wall of the reinforcing layer to form the high-pressure hydrogen storage cylinder; The reinforcing layer is formed on the outer wall of the inner liner of the hydrogen storage cylinder, comprising: The reinforcing winding tape is wound around the inner liner using an enlarged hole winding method, so that the pressure generated by the reinforcing layer on the outer wall of the inner liner is greater than or equal to the preset burst tension; The support layer is a carbon fiber layer, and the support layer is wound around the outer wall of the reinforcing layer, including: The support layer is wound using alternating circumferential and helical winding methods, and the tension of the support layer decreases gradually during winding. The protective layer is a glass fiber layer. The protective layer is wound around the outer wall of the reinforcing layer, including: winding the protective layer around the outer wall of the supporting layer by alternating circumferential winding and spiral winding, and the strip distance of the protective layer is the same each time it is wound.

2. The method for preparing a high-pressure hydrogen storage cylinder according to claim 1, characterized in that, When the reinforcing winding tape is spirally wound on the outer side wall of the inner liner, the winding distance of the reinforcing winding tape is 2mm~8mm, and the winding distance is different each time it is spirally wound.

3. The method for preparing a high-pressure hydrogen storage cylinder according to claim 1, characterized in that, When the reinforcing winding tape is wound circumferentially on the inner liner, the winding distance of the reinforcing winding tape is the same.

4. The method for preparing a high-pressure hydrogen storage cylinder according to claim 1, characterized in that, The reinforcing winding tape uses an epoxy resin system, and the resin content of the reinforcing winding tape is 30% to 35% in the center.

5. The method for preparing a high-pressure hydrogen storage cylinder according to claim 1, characterized in that, The winding tension decreases by 10N for every 6 layers of the support layer.

6. The method for preparing a high-pressure hydrogen storage cylinder according to claim 5, characterized in that, When the support layer is wound in the circumferential direction, the winding distance is the same; when the support layer is wound in the helical direction, the winding distance is 2mm to 8mm, and the winding distance is different for each helical winding.

7. The method for preparing a high-pressure hydrogen storage cylinder according to claim 1, characterized in that, The method further includes: The reinforcing layer, the supporting layer, and the protective layer are cured.

8. A high-pressure hydrogen storage cylinder, characterized in that, This includes high-pressure hydrogen storage cylinders manufactured by the preparation method described in any one of claims 1 to 7.

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