A metal hydride hydrogen storage tank with internal heat exchange structure and preparation method thereof

Abstract

The present application relates to the technical field of metal hydride hydrogen storage tanks, and specifically provides a metal hydride hydrogen storage tank with an internal heat exchange structure and a preparation method thereof, the hydrogen storage tank comprising: a hydrogen storage tank body, on which a valve is arranged; a plurality of annular heat exchange columns, which are concentrically arranged in the hydrogen storage tank body; a plurality of internal ribs, which are radially arranged in the hydrogen storage tank body and are integrally formed with the hydrogen storage tank body and the annular heat exchange columns, the annular heat exchange columns, the hydrogen storage tank body and the internal ribs enclose a plurality of storage cavities; a hydrogen storage alloy bed body, which is filled in the plurality of storage cavities; the hydrogen storage tank can solve the problem of contact thermal resistance between the heat-conducting structure and the hydrogen storage tank caused by the need to install a plurality of heat-conducting structures on the inner side of the hydrogen storage tank by welding, fastener locking and fixing, etc. in the existing hydrogen storage tank, and avoid the situation in which the hydrogen storage tank is damaged due to the additional expansion stress generated by the hydrogen storage alloy material powder accumulated at a local position in the hydrogen storage tank when it further absorbs hydrogen and expands.

Description

Technical Field

[0001] The present application relates to the technical field of metal hydride hydrogen storage tanks, and in particular to a metal hydride hydrogen storage tank with an internal heat exchange structure and a preparation method thereof. Background Art

[0002] The current hydrogen storage methods are divided into: high-pressure gaseous hydrogen storage, liquid hydrogen storage and solid hydrogen storage with hydrogen storage materials as the medium. Since solid hydrogen storage has the advantages of high volume hydrogen storage density, low pressure safety and high hydrogen purity, solid hydrogen storage is an important direction for the future development of hydrogen storage technology. However, the current solid hydrogen storage technology still faces the following technical difficulties:

[0003] 1. Heat transfer of hydrogen storage alloy materials. Hydrogen storage alloy materials need to release a lot of heat when absorbing hydrogen and absorb a lot of heat when releasing hydrogen. Therefore, in order to make the absorption and desorption of hydrogen by the hydrogen storage alloy materials in the metal hydride hydrogen storage tank proceed smoothly and improve the response speed of absorption and desorption of hydrogen, the metal hydride hydrogen storage tank must have good heat transfer performance.

[0004] 2. The influence of the expansion stress of the hydrogen storage alloy material during the process of hydrogen absorption and desorption on the tank body of the metal hydride hydrogen storage tank. During the process of hydrogen absorption, the hydrogen storage alloy material will produce a volume expansion effect when it is converted into metal hydride. The volume expansion rate of the hydrogen storage alloy material is usually 20% to 40%, and after repeated expansion and contraction during hydrogen absorption and desorption, a part of the hydrogen storage alloy material will gradually form powder. Therefore, there will be accumulation of hydrogen storage alloy material powder in the metal hydride hydrogen storage tank. These accumulated hydrogen storage alloy material powders will produce additional expansion stress when further expanding due to hydrogen absorption, thereby causing irreversible plastic deformation or even rupture of the tank body of the metal hydride hydrogen storage tank, which will lead to damage to the metal hydride hydrogen storage tank.

[0005] In order to overcome the above technical difficulties, various researchers have made a lot of research and inventions. For example, patent documents such as CN204592845U, CN202048351U, CN203500844U, CN105387341A, and CN108131563A proposed placing some heat-conducting structures (such as honeycomb aluminum foil, foamed aluminum, porous granular capsules, springs, and spiral rods) in metal hydride hydrogen storage tanks. Although the above-mentioned patent documents have improved the heat transfer performance of metal hydride hydrogen storage tanks and improved the local accumulation phenomenon of hydrogen storage alloy material powder to a certain extent, since these patent documents all require the installation of a number of heat-conducting structures on the inner side of the metal hydride hydrogen storage tank by welding, fastener locking and fixing, etc., the existing metal hydride hydrogen storage tanks have the problem of contact thermal resistance between the heat-conducting structures and the metal hydride hydrogen storage tanks due to the need to install a number of heat-conducting structures on the inner side of the metal hydride hydrogen storage tanks by welding, fastener locking and fixing, etc., which leads to a decrease in the heat transfer performance of the metal hydride hydrogen storage tank, and further leads to a low hydrogen absorption and desorption rate of the metal hydride hydrogen storage tank.

[0006] There is currently no effective technical solution to the above problems. Summary of the invention

[0007] The purpose of the present application is to provide a metal hydride hydrogen storage tank with an internal heat exchange structure and a preparation method thereof, which can solve the problem of contact thermal resistance between the heat-conducting structure and the metal hydride hydrogen storage tank caused by the need to install a plurality of heat-conducting structures on the inner side of the metal hydride hydrogen storage tank by welding, fastener locking and fixing, etc. in the existing metal hydride hydrogen storage tank, and avoid the situation in which the metal hydride hydrogen storage tank is damaged due to the additional expansion stress generated by the hydrogen storage alloy material powder accumulated at a local position in the metal hydride hydrogen storage tank when it further absorbs hydrogen and expands.

[0008] In a first aspect, the present application provides a metal hydride hydrogen storage tank with an internal heat exchange structure, the metal hydride hydrogen storage tank comprising:

[0009] A hydrogen storage tank body, on which a valve is provided;

[0010] A plurality of annular heat exchange columns are concentrically arranged in the hydrogen storage tank body;

[0011] A plurality of internal ribs are radially arranged in the hydrogen storage tank body and are integrally formed with the hydrogen storage tank body and the annular heat exchange column. The annular heat exchange column, the hydrogen storage tank body and the internal ribs enclose a plurality of storage chambers;

[0012] The hydrogen storage alloy bed is filled in a plurality of storage chambers.

[0013] The present application provides a metal hydride hydrogen storage tank with an internal heat exchange structure, comprising a hydrogen storage tank body, a plurality of annular heat exchange columns and a plurality of internal ribs. Since the hydrogen storage tank body, the annular heat exchange columns and the internal ribs are integrally formed, no contact thermal resistance is generated between the hydrogen storage tank body and the internal ribs and between the annular heat exchange columns and the internal ribs, thereby effectively improving the heat transfer performance of the metal hydride hydrogen storage tank, and further effectively improving the hydrogen absorption and desorption rate of the metal hydride hydrogen storage tank. Since the annular heat exchange columns, the hydrogen storage tank body and the internal ribs enclose a plurality of storage cavities, the hydrogen storage alloy bed is filled in the plurality of storage cavities, and each storage cavity can support and separate the hydrogen storage alloy material powder. Therefore, the metal hydride hydrogen storage tank can effectively avoid the situation where the hydrogen storage alloy material powder accumulates at a local position in the metal hydride hydrogen storage tank after long-term use, thereby effectively avoiding the situation where the hydrogen storage alloy material powder accumulated at a local position in the metal hydride hydrogen storage tank generates additional expansion stress when further absorbing hydrogen and expanding, thereby causing damage to the metal hydride hydrogen storage tank.

[0014] Optionally, the wall thickness of the annular heat exchange column close to the center of the hydrogen storage tank body is smaller than the wall thickness of the annular heat exchange column far from the center of the hydrogen storage tank body.

[0015] Since the inner diameter of the annular heat exchange column near the center of the hydrogen storage tank body is smaller than the inner diameter of the annular heat exchange column far from the center of the hydrogen storage tank body, that is, the contact area between the annular heat exchange column near the center of the hydrogen storage tank body and the hydrogen is smaller than the contact area between the annular heat exchange column far from the center of the hydrogen storage tank body and the hydrogen, and the force acting on the annular heat exchange column is positively correlated with the contact area between the annular heat exchange column and the hydrogen, this technical solution can enhance the pressure bearing capacity of the annular heat exchange column far from the center of the hydrogen storage tank body, thereby further improving the structural stability of the metal hydride hydrogen storage tank.

[0016] Optionally, the thickness of the internal ribs gradually increases in a direction away from the center of the hydrogen storage tank.

[0017] This technical solution sets the thickness of the internal ribs to gradually increase in a direction away from the center of the hydrogen storage tank body, thereby effectively enhancing the pressure-bearing capacity of the internal ribs and further improving the structural stability of the metal hydride hydrogen storage tank.

[0018] Optionally, the ratio of inner diameters of adjacent annular heat exchange columns is 1:2-1:3.

[0019] When the ratio of the inner diameters of adjacent circular heat exchange columns is 1:2-1:3, each circular heat exchange column and the internal ribs are equipped with a sufficiently large heat exchange space. Therefore, the technical solution can effectively improve the heat exchange performance of the circular heat exchange columns and the internal ribs by setting the ratio of the inner diameters of adjacent circular heat exchange columns to 1:2-1:3.

[0020] Optionally, the metal hydride hydrogen storage tank with an internal heat exchange structure includes two annular heat exchange columns, and the ratio of the wall thickness of the annular heat exchange column away from the center of the hydrogen storage tank body to the wall thickness of the annular heat exchange column close to the center of the hydrogen storage tank body is 1.2:1-1.5:1.

[0021] When the ratio of the wall thickness of the annular heat exchange column away from the center of the hydrogen storage tank body to the wall thickness of the annular heat exchange column close to the center of the hydrogen storage tank body is 1.2:1-1.5:1, the annular heat exchange column has good pressure-bearing capacity. Since the heat exchange performance of the annular heat exchange column is negatively correlated with its wall thickness, this technical solution can effectively improve the heat exchange performance of the annular heat exchange column and reduce the production cost of the annular heat exchange column while ensuring the pressure-bearing capacity of the annular heat exchange column.

[0022] Optionally, the number of the internal ribs is 8-12.

[0023] When the number of internal ribs is 8-12, the metal hydride hydrogen storage tank has good heat transfer performance. Therefore, this technical solution can effectively avoid the problems of high production cost and difficulty of the metal hydride hydrogen storage tank due to too many internal ribs and poor heat transfer performance of the metal hydride hydrogen storage tank due to too few internal ribs.

[0024] Optionally, the metal hydride hydrogen storage tank with an internal heat exchange structure further includes a filter plate, and the filter plate is arranged between the hydrogen storage tank body and the valve.

[0025] The technical solution sets a filter between the tank mouth and the valve. Since the filter can filter the hydrogen storage alloy material powder in the hydrogen, the technical solution can avoid the situation where the hydrogen storage alloy material powder enters the valve along with the hydrogen as much as possible, thereby effectively extending the service life of the valve.

[0026] In a second aspect, the present application also provides a method for preparing a metal hydride hydrogen storage tank with an internal heat exchange structure, which is used to prepare a metal hydride hydrogen storage tank with an internal heat exchange structure. The metal hydride hydrogen storage tank with an internal heat exchange structure includes a hydrogen storage tank body, a hydrogen storage alloy bed body, a plurality of annular heat exchange columns and a plurality of internal ribs. The plurality of annular heat exchange columns are concentrically arranged in the hydrogen storage tank body, and different annular heat exchange columns have different inner diameters. A plurality of internal ribs are arranged in a circular array in the hydrogen storage tank body and are integrally formed with the hydrogen storage tank body and the plurality of annular heat exchange columns. The annular heat exchange columns, the hydrogen storage tank body and the internal ribs enclose a plurality of storage cavities. The hydrogen storage alloy bed body is arranged in the plurality of storage cavities. The hydrogen storage tank body includes a tank body, and at least one end of the tank body is provided with a tank mouth and a valve. The method for preparing a metal hydride hydrogen storage tank with an internal heat exchange structure includes the following steps:

[0027] An aluminum rod is integrally extruded based on an extrusion die to form a can body including a circular heat exchange column and internal ribs;

[0028] Remove the annular heat exchange columns and internal ribs near both ends of the tank body;

[0029] Performing spin forming on both ends of the tank body from which part of the heat exchange structure is removed, so as to form a hydrogen storage tank body having at least one tank opening;

[0030] Evenly filling the hydrogen storage alloy bed into the hydrogen storage tank;

[0031] A valve and a filter are installed at the tank mouth to prepare a metal hydride hydrogen storage tank with an internal heat exchange structure;

[0032] An activation treatment is performed on a metal hydride hydrogen storage tank with an internal heat exchange structure.

[0033] The present application provides a method for preparing a metal hydride hydrogen storage tank with an internal heat exchange structure, which is used to prepare a metal hydride hydrogen storage tank with an internal heat exchange structure, which includes a hydrogen storage tank body, a plurality of annular heat exchange columns and a plurality of internal ribs. Since the hydrogen storage tank body, the annular heat exchange columns and the internal ribs are integrally formed, no contact thermal resistance is generated between the hydrogen storage tank body and the internal ribs, and between the annular heat exchange columns and the internal ribs, thereby effectively improving the heat transfer performance of the metal hydride hydrogen storage tank, and further effectively improving the hydrogen absorption and desorption rate of the metal hydride hydrogen storage tank. The hydrogen tank body and internal ribs enclose a plurality of storage cavities, and the hydrogen storage alloy bed body is filled in the plurality of storage cavities, and each storage cavity can support and separate the hydrogen storage alloy material powder. Therefore, the metal hydride hydrogen storage tank can effectively avoid the situation where the hydrogen storage alloy material powder accumulates in a local position in the metal hydride hydrogen storage tank after long-term use, thereby effectively avoiding the situation where the metal hydride hydrogen storage tank is damaged due to the additional expansion stress generated by the hydrogen storage alloy material powder accumulated in a local position in the metal hydride hydrogen storage tank when it further absorbs hydrogen and expands.

[0034] Optionally, the step of integrally extruding the aluminum rod using an extrusion die to form a can body including an annular heat exchange column and internal ribs includes:

[0035] The extrusion die and the aluminum rod are placed in a heating furnace for preheating;

[0036] Installing an extrusion die into an extruder and placing an aluminum rod at a raw material inlet of the extruder, and extruding the aluminum rod by using the extrusion die to form a can body including a circular heat exchange column and internal ribs;

[0037] After the can body is cooled, the can body is straightened using a stretching machine or a straightening machine;

[0038] Use a sawing machine to saw the straightened can body;

[0039] The sawn can body is sent to the aging furnace for aging treatment.

[0040] Optionally, the step of performing spin forming on both ends of the tank body from which part of the heat exchange structure is removed to form a hydrogen storage tank body having at least one tank opening comprises:

[0041] Determine the clamping position according to the closing length of the can body with part of the heat exchange structure removed, and feed the can body with part of the heat exchange structure removed to the spinning machine according to the clamping position;

[0042] Use a heating furnace and a heating gun to heat the mold used in spinning and the can body with some heat exchange structures removed to 280-320°C;

[0043] The spindle speed, axial feed distance, number of wheel swings and angle of each wheel swing of the spinning machine are set according to the diameter of the tank body with part of the heat exchange structure removed and the shape of the tank mouth. The two ends of the tank body with part of the heat exchange structure removed are spun using the set spinning machine to form a hydrogen storage tank body with at least one tank mouth.

[0044] As can be seen from the above, the present application provides a metal hydride hydrogen storage tank with an internal heat exchange structure and a preparation method thereof, comprising a hydrogen storage tank body, a plurality of annular heat exchange columns and a plurality of internal ribs. Since the hydrogen storage tank body, the annular heat exchange columns and the internal ribs are integrally formed, no contact thermal resistance is generated between the hydrogen storage tank body and the internal ribs and between the annular heat exchange columns and the internal ribs, thereby effectively improving the heat transfer performance of the metal hydride hydrogen storage tank, and further effectively improving the hydrogen absorption and desorption rate of the metal hydride hydrogen storage tank. The strips are enclosed to form a plurality of storage cavities, and the hydrogen storage alloy bed is filled in the plurality of storage cavities, and each storage cavity can support and separate the hydrogen storage alloy material powder. Therefore, the metal hydride hydrogen storage tank can effectively avoid the situation where the hydrogen storage alloy material powder accumulates in a local position in the metal hydride hydrogen storage tank after long-term use, thereby effectively avoiding the situation where the hydrogen storage alloy material powder accumulated in a local position in the metal hydride hydrogen storage tank will generate additional expansion stress when further absorbing hydrogen and expanding, thereby causing damage to the metal hydride hydrogen storage tank. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] Figure 1 A schematic structural diagram of a metal hydride hydrogen storage tank with an internal heat exchange structure provided in the first embodiment of the present application.

[0046] Figure 2 A schematic cross-sectional structure diagram along the vertical direction of a metal hydride hydrogen storage tank with an internal heat exchange structure provided in the first embodiment of the present application.

[0047] Figure 3 For along Figure 2Schematic diagram of the cross-sectional structure of the AA section line.

[0048] Figure 4 A schematic cross-sectional structure diagram along the vertical direction of a metal hydride hydrogen storage tank with an internal heat exchange structure provided in the second embodiment of the present application.

[0049] Figure 5 A flow chart of a method for preparing a metal hydride hydrogen storage tank with an internal heat exchange structure provided in an embodiment of the present application.

[0050] Figure 6 A schematic diagram of a method for preparing a metal hydride hydrogen storage tank with an internal heat exchange structure provided in an embodiment of the present application during preparation of the tank body.

[0051] Figure numerals: 1. hydrogen storage tank; 2. valve; 3. annular heat exchange column; 4. internal ribs; 5. hydrogen storage alloy bed; 6. filter plate; 7. air guide pipe. DETAILED DESCRIPTION

[0052] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all of the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the application claimed for protection, but merely represents the selected embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without making creative work belong to the scope of protection of the present application.

[0053] It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings. At the same time, in the description of this application, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0054] First, as Figure 1-Figure 4 As shown, the present application provides a metal hydride hydrogen storage tank with an internal heat exchange structure, the metal hydride hydrogen storage tank comprising:

[0055] A hydrogen storage tank body 1, on which a valve 2 is provided;

[0056] A plurality of annular heat exchange columns 3 are concentrically arranged in the hydrogen storage tank body 1;

[0057] A plurality of internal ribs 4 are radially arranged in the hydrogen storage tank body 1 and are integrally formed with the hydrogen storage tank body 1 and the annular heat exchange column 3. The annular heat exchange column 3, the hydrogen storage tank body 1 and the internal ribs 4 enclose a plurality of storage chambers;

[0058] The hydrogen storage alloy bed 5 is filled in a plurality of storage chambers.

[0059] Among them, the metal hydride hydrogen storage tank is a container for loading hydrogen storage alloy materials (which can be called metal hydride) to absorb and release hydrogen. The hydrogen storage tank body 1 of this embodiment is prepared by an integrated extrusion molding device and a spin forming device. Specifically, the cross-sectional shape of the hydrogen storage tank body 1 of this embodiment is circular, and a valve 2 is provided on the hydrogen storage tank body 1. This embodiment can adjust the absorption rate or output rate of hydrogen by adjusting the opening of the valve 2. The material of the hydrogen storage tank body 1 of this embodiment is a metal material. Preferably, since aluminum alloy has the advantages of good thermal conductivity, high strength and light weight, the material of the hydrogen storage tank body 1 of this embodiment is aluminum alloy. More preferably, the material of the hydrogen storage tank body 1 of this embodiment is 6063-T6 aluminum alloy or 6061-T6 aluminum alloy. The metal hydride hydrogen storage tank with an internal heat exchange structure of this embodiment includes a plurality of annular heat exchange columns 3 and a plurality of internal ribs 4, wherein the plurality of annular heat exchange columns 3 are concentrically arranged in the hydrogen storage tank body 1, and the plurality of internal ribs 4 are radially arranged in the hydrogen storage tank body 1 and are integrally formed with the hydrogen storage tank body 1 and the annular heat exchange columns 3, that is, the hydrogen storage tank body 1, the annular heat exchange columns 3 and the internal ribs 4 of this embodiment are prepared by an integral extrusion molding device in a one-piece molding process, and the annular heat exchange columns 3, the hydrogen storage tank body 1 and the internal ribs 4 of this embodiment enclose a plurality of storage cavities. It should be understood that since the hydrogen storage tank body 1, the annular heat exchange columns 3 and the internal ribs 4 are integrally formed, the material of the annular heat exchange columns 3 and the material of the internal ribs 4 of this embodiment are the same as the material of the hydrogen storage tank body 1. The hydrogen storage alloy bed 5 of this embodiment is a uniform mixture of hydrogen storage alloy materials and additives, that is, the hydrogen storage alloy bed 5 of this embodiment is equivalent to a carrier of hydrogen storage alloy materials and additives. The hydrogen storage alloy bed 5 of this embodiment is filled in the hydrogen storage tank body 1. Specifically, the hydrogen storage alloy material can be rare earth AB5 type, titanium AB2 type and AB type, titanium-vanadium solid solution, etc.

[0060] A metal hydride hydrogen storage tank with an internal heat exchange structure provided in the present application includes a hydrogen storage tank body 1, a plurality of annular heat exchange columns 3 and a plurality of internal ribs 4, wherein the plurality of annular heat exchange columns 3 are concentrically arranged in the hydrogen storage tank body 1, and the plurality of internal ribs 4 are radially arranged in the hydrogen storage tank body 1 and are integrally formed with the hydrogen storage tank body 1 and the annular heat exchange columns 3. Since the hydrogen storage tank body 1, the annular heat exchange columns 3 and the internal ribs 4 are integrally formed, no contact thermal resistance is generated between the hydrogen storage tank body 1 and the internal ribs 4, and between the annular heat exchange columns 3 and the internal ribs 4. That is, the metal hydride hydrogen storage tank with an internal heat exchange structure provided in the present application can solve the problem that the existing metal hydride hydrogen storage tank needs to install a plurality of heat-conducting structures on the inner side of the metal hydride hydrogen storage tank by welding, fastener locking and fixing, etc., which causes contact thermal resistance between the heat-conducting structure and the metal hydride hydrogen storage tank. The problem is solved, thereby effectively improving the heat transfer performance of the metal hydride hydrogen storage tank, and then effectively improving the hydrogen absorption and desorption rate of the metal hydride hydrogen storage tank. Since the circular heat exchange column 3, the hydrogen storage tank body 1 and the internal ribs 4 enclose a plurality of storage chambers, the hydrogen storage alloy bed 5 is filled in the plurality of storage chambers, and each storage chamber can support and separate the hydrogen storage alloy material powder, that is, the metal hydride hydrogen storage tank is equivalent to dispersing the hydrogen storage alloy material powder in a plurality of storage chambers. Therefore, the metal hydride hydrogen storage tank can effectively avoid the situation where the hydrogen storage alloy material powder accumulates in a local position in the metal hydride hydrogen storage tank after long-term use, thereby effectively avoiding the situation where the hydrogen storage alloy material powder accumulated in a local position in the metal hydride hydrogen storage tank will generate additional expansion stress when further absorbing hydrogen and expanding, thereby causing damage to the metal hydride hydrogen storage tank. In addition, since the internal ribs 4 and the annular heat exchange column 3 integrally formed with the hydrogen storage tank body 1 can serve as the reinforcement structure of the hydrogen storage tank body 1, and installing the heat-conducting structure in the metal hydride hydrogen storage tank by welding, fastener locking and fixing, etc. will reduce the overall strength of the metal hydride hydrogen storage tank, compared with the existing metal hydride hydrogen storage tank, the present application can also effectively improve the structural stability and pressure bearing capacity of the metal hydride hydrogen storage tank, and since heat can be transferred between multiple annular heat exchange columns 3 and between the annular heat exchange column 3 and the hydrogen storage tank body 1 through the internal ribs 4, the present application can further improve the heat transfer performance of the metal hydride hydrogen storage tank by setting the internal ribs 4.

[0061] In some embodiments, the wall thickness of the annular heat exchange column 3 near the center of the hydrogen storage tank body 1 is less than the wall thickness of the annular heat exchange column 3 far from the center of the hydrogen storage tank body 1. Specifically, the wall thickness of the cylindrical heat exchange column of this embodiment is 3-6 mm, and the wall thickness of the hydrogen storage tank body 1 of this embodiment is greater than 6 mm. Since the inner diameter of the annular heat exchange column 3 near the center of the hydrogen storage tank body 1 is smaller than the inner diameter of the annular heat exchange column 3 far from the center of the hydrogen storage tank body 1, that is, the contact area between the annular heat exchange column 3 near the center of the hydrogen storage tank body 1 and the hydrogen is smaller than the contact area between the annular heat exchange column 3 far from the center of the hydrogen storage tank body 1 and the hydrogen, and from the pressure formula F=PS (where F represents pressure, P represents pressure, and S represents contact area), it can be seen that under the same pressure, the pressure on the annular heat exchange column 3 is positively correlated with the contact area between the annular heat exchange column 3 and the hydrogen, so this embodiment can enhance the pressure bearing capacity of the annular heat exchange column 3 far from the center of the hydrogen storage tank body 1, thereby further improving the structural stability of the metal hydride hydrogen storage tank. It should be understood that if the material of the cylindrical heat exchange column changes, the wall thickness will also change.

[0062] In some embodiments, the thickness of the internal ribs 4 gradually increases in the direction away from the center of the hydrogen storage tank body 1. Each internal rib 4 of this embodiment connects the hydrogen storage tank body 1 and all the annular heat exchange columns 3. Since the space of the storage cavity away from the center of the hydrogen storage tank body 1 is larger than the space of the storage cavity near the center of the hydrogen storage tank body 1, and the hydrogen storage alloy bed 5 is filled in the storage cavity, that is, the heat required to be transferred in the storage cavity away from the center of the hydrogen storage tank body 1 is greater than the heat required to be transferred in the storage cavity near the center of the hydrogen storage tank body 1, and the pressure on the storage cavity away from the center of the hydrogen storage tank body 1 is greater than the pressure on the storage cavity near the center of the hydrogen storage tank body 1. Therefore, this embodiment sets the thickness of the internal ribs 4 to gradually increase in the direction away from the center of the hydrogen storage tank body 1, thereby effectively enhancing the pressure bearing capacity and heat transfer capacity of the internal ribs 4, and further improving the structural stability and heat transfer performance of the metal hydride hydrogen storage tank.

[0063] In some embodiments, the ratio of the inner diameters of adjacent annular heat exchange columns 3 is 1:2-1:3. When the ratio of the inner diameters of adjacent annular heat exchange columns 3 is 1:2-1:3, each annular heat exchange column 3 and the internal rib 4 are equipped with a sufficiently large heat exchange space (i.e., the contact area between hydrogen and the annular heat exchange column 3 and the internal rib 4 is large enough), so this embodiment can effectively improve the heat exchange performance of the annular heat exchange column 3 and the internal rib 4 by setting the ratio of the inner diameters of adjacent annular heat exchange columns 3 to 1:2-1:3. Specifically, the inner diameter of the annular heat exchange column 3 closest to the center of the hydrogen storage tank body 1 is 30-60mm, and the inner diameter difference of adjacent annular heat exchange columns 3 is 30-60mm.

[0064] In some embodiments, the metal hydride hydrogen storage tank with an internal heat exchange structure includes two annular heat exchange columns 3, and the ratio of the wall thickness of the annular heat exchange column 3 away from the center of the hydrogen storage tank body 1 to the wall thickness of the annular heat exchange column 3 close to the center of the hydrogen storage tank body 1 is 1.2:1-1.5:1. When the ratio of the wall thickness of the annular heat exchange column 3 away from the center of the hydrogen storage tank body 1 to the wall thickness of the annular heat exchange column 3 close to the center of the hydrogen storage tank body 1 is 1.2:1-1.5:1, the annular heat exchange column 3 has a good pressure bearing capacity. Since the heat exchange performance of the annular heat exchange column 3 is negatively correlated with its wall thickness, this embodiment can effectively improve the heat exchange performance of the annular heat exchange column 3 and reduce the production cost of the annular heat exchange column 3 while ensuring the pressure bearing capacity of the annular heat exchange column 3. It should be understood that the metal hydride hydrogen storage tank with an internal heat exchange structure can also include more than two annular heat exchange columns 3, and at this time, the ratio of the wall thickness of two adjacent annular heat exchange columns 3 is 1.2:1-1.5:1. It should also be understood that, during the heat release process, the annular heat exchange column 3 away from the center of the hydrogen storage tank body 1 also needs to transfer the heat absorbed by the annular heat exchange column 3 close to the center of the hydrogen storage tank body 1 to the outside.

[0065] In some embodiments, the number of the internal ribs 4 is 8-12. When the number of the internal ribs 4 is 8-12, the metal hydride hydrogen storage tank has good heat transfer performance, so this embodiment can effectively avoid the problem of high production cost and difficulty of the metal hydride hydrogen storage tank due to too many internal ribs 4 and the problem of poor heat transfer performance of the metal hydride hydrogen storage tank due to too few internal ribs 4.

[0066] In some embodiments, the metal hydride hydrogen storage tank with an internal heat exchange structure further includes a filter 6, which is disposed between the hydrogen storage tank body 1 and the valve 2. Specifically, the filter 6 of this embodiment is sintered by a stainless steel or copper alloy powder metallurgy method, and the filtering accuracy of the filter 6 of this embodiment is less than 3 microns. In this embodiment, the filter 6 is disposed between the tank mouth and the valve 2. Since the filter 6 can filter the hydrogen storage alloy material powder in the hydrogen, this embodiment can avoid the situation where the hydrogen storage alloy material powder enters the valve 2 along with the hydrogen as much as possible, thereby effectively extending the service life of the valve 2.

[0067] In some embodiments, the hydrogen storage tank body 1 includes a tank body and at least one tank opening. If the hydrogen storage tank body 1 includes a tank opening, the hydrogen storage tank body 1 of this embodiment includes a tank opening, a tank body and a tank bottom connected in sequence (refer to Figure 1 and Figure 2 ), the tank mouth, tank body and tank bottom are prepared by an integrated extrusion molding device and a spin forming device; if the hydrogen storage tank body 1 includes two tank mouths, the hydrogen storage tank body 1 of this embodiment includes a tank body and tank mouths located at both ends of the tank body (refer to Figure 4), the can mouth and the can body are prepared by an integrated extrusion molding device and a spin forming device.

[0068] In some embodiments, the metal hydride hydrogen storage tank with an internal heat exchange structure further includes an air guide pipe 7, which is disposed in the hydrogen storage tank body 1, and a plurality of air guide holes are provided on the air guide pipe 7. Specifically, if the hydrogen storage tank body 1 includes two tank openings, the two ends of the air guide pipe 7 are respectively connected to the two tank openings; if the hydrogen storage tank body 1 includes one tank opening, the two ends of the air guide pipe 7 are respectively connected to the tank opening and the tank bottom; preferably, the air guide pipe 7 of this embodiment is integrally formed with the hydrogen storage tank body 1. Since the air guide pipe 7 can guide the hydrogen, this embodiment can make the hydrogen flow out or flow into the hydrogen storage tank body 1 more smoothly by providing the air guide pipe 7, thereby further improving the hydrogen absorption and desorption rate of the metal hydride hydrogen storage tank.

[0069] In some embodiments, the length of the internal ribs 4 and the annular heat exchange column 3 is less than the length of the tank body. Since the length of the internal ribs 4 and the annular heat exchange column 3 is less than the length of the tank body, the bottoms and tops of the multiple storage cavities formed by the annular heat exchange column 3, the hydrogen storage tank body 1 and the internal ribs 4 are interconnected.

[0070] As can be seen from the above, the metal hydride hydrogen storage tank with an internal heat exchange structure provided by the present application includes a hydrogen storage tank body 1, a plurality of annular heat exchange columns 3 and a plurality of internal ribs 4, the plurality of annular heat exchange columns 3 are concentrically arranged in the hydrogen storage tank body 1, and the plurality of internal ribs 4 are radially arranged in the hydrogen storage tank body 1 and are integrally formed with the hydrogen storage tank body 1 and the annular heat exchange columns 3. Since the hydrogen storage tank body 1, the annular heat exchange columns 3 and the internal ribs 4 are integrally formed, no contact thermal resistance is generated between the hydrogen storage tank body 1 and the internal ribs 4, and between the annular heat exchange columns 3 and the internal ribs 4. That is, the metal hydride hydrogen storage tank with an internal heat exchange structure provided by the present application can solve the problem that the existing metal hydride hydrogen storage tank needs to install a plurality of heat-conducting structures on the inner side of the metal hydride hydrogen storage tank by welding, fastener locking and fixing, etc., which causes contact between the heat-conducting structure and the metal hydride hydrogen storage tank. The problem of thermal resistance is solved, thereby effectively improving the heat transfer performance of the metal hydride hydrogen storage tank, and then effectively improving the hydrogen absorption and desorption rate of the metal hydride hydrogen storage tank. Since the annular heat exchange column 3, the hydrogen storage tank body 1 and the internal ribs 4 enclose a plurality of storage chambers, the hydrogen storage alloy bed 5 is filled in the plurality of storage chambers, and each storage chamber can support and separate the hydrogen storage alloy material powder, that is, the metal hydride hydrogen storage tank is equivalent to dispersing the hydrogen storage alloy material powder in a plurality of storage chambers. Therefore, the metal hydride hydrogen storage tank can effectively avoid the situation where the hydrogen storage alloy material powder accumulates in a local position in the metal hydride hydrogen storage tank after long-term use, thereby effectively avoiding the situation where the hydrogen storage alloy material powder accumulated in a local position in the metal hydride hydrogen storage tank will generate additional expansion stress when further absorbing hydrogen and expanding, thereby causing damage to the metal hydride hydrogen storage tank.

[0071] Second, as Figure 5 As shown, the present application also provides a method for preparing a metal hydride hydrogen storage tank with an internal heat exchange structure, which is used to prepare a metal hydride hydrogen storage tank with an internal heat exchange structure. The metal hydride hydrogen storage tank with an internal heat exchange structure includes a hydrogen storage tank body 1, a hydrogen storage alloy bed body 5, a plurality of annular heat exchange columns 3 and a plurality of internal ribs 4. The plurality of annular heat exchange columns 3 are concentrically arranged in the hydrogen storage tank body 1, and different annular heat exchange columns 3 have different inner diameters. The plurality of internal ribs 4 are arranged in a circular array in the hydrogen storage tank body 1 and are integrally formed with the hydrogen storage tank body 1 and the plurality of annular heat exchange columns 3. The annular heat exchange columns 3, the hydrogen storage tank body 1 and the internal ribs 4 enclose a plurality of storage cavities. The hydrogen storage alloy bed body 5 is arranged in the plurality of storage cavities. The hydrogen storage tank body 1 includes a tank body, and at least one end of the tank body is provided with a tank mouth and a valve 2. The method for preparing a metal hydride hydrogen storage tank with an internal heat exchange structure includes the following steps:

[0072] S1, using an extrusion die to integrally extrude the aluminum rod to form a can body including a circular heat exchange column 3 and internal ribs 4 (refer to Figure 6 a in (a);

[0073] S2, remove the circular heat exchange column 3 and internal ribs 4 near both ends of the tank body (reference Figure 6 b);

[0074] S3, performing spin forming processing on both ends of the tank body with part of the heat exchange structure removed to form a hydrogen storage tank body 1 having at least one tank opening;

[0075] S4, evenly filling the hydrogen storage alloy bed 5 into the hydrogen storage tank 1;

[0076] S5, installing a valve 2 and a filter sheet 6 at the tank mouth to prepare a metal hydride hydrogen storage tank with an internal heat exchange structure;

[0077] S6. Activate the metal hydride hydrogen storage tank with an internal heat exchange structure.

[0078] The embodiment of the present application provides a method for preparing a metal hydride hydrogen storage tank with an internal heat exchange structure, and the preparation method is used to prepare a metal hydride hydrogen storage tank with an internal heat exchange structure as provided in the first aspect above. The specific process of step S6 for activating the metal hydride hydrogen storage tank is: absorbing and releasing hydrogen once on the metal hydride hydrogen storage tank. The working principle of the method for preparing a metal hydride hydrogen storage tank with an internal heat exchange structure provided in the embodiment of the present application is the same as the working principle of the metal hydride hydrogen storage tank with an internal heat exchange structure provided in the first aspect above, and will not be discussed in detail here.

[0079] In some embodiments, step S1 includes:

[0080] S11, placing the extrusion die and the aluminum rod in a heating furnace for preheating;

[0081] S12, installing the extrusion die into the extruder and placing the aluminum rod at the raw material inlet of the extruder, and extruding the aluminum rod by the extrusion die to form a can body including the annular heat exchange column 3 and the internal ribs 4;

[0082] S13, after the can body is cooled, straightening the can body by using a stretching machine or a straightening machine;

[0083] S14, sawing the straightened can body by using a sawing machine;

[0084] S15, sending the sawn can body to an aging furnace for aging treatment.

[0085] In some embodiments, step S3 comprises:

[0086] S31, determining a clamping position according to the closing length of the can body with a portion of the heat exchange structure removed, and feeding the can body with a portion of the heat exchange structure removed to a spinning machine according to the clamping position;

[0087] S32, using a heating furnace and a heating gun to heat the mold used in the spinning process and the can body with part of the heat exchange structure removed to 280-320° C.;

[0088] S33, according to the diameter of the tank body with part of the heat exchange structure removed and the shape of the tank mouth, the spindle speed, axial feed distance, number of times the rotary wheel swings and the angle of each rotary wheel swing of the spinning machine are set, and the two ends of the tank body with part of the heat exchange structure removed are spun by using the set spinning machine to form a hydrogen storage tank body 1 with at least one tank mouth.

[0089] Among them, step S33 needs to set the spindle speed, axial feed distance, number of times of the rotary wheel swing angle and the angle of each rotary wheel swing angle of the spinning machine according to the diameter of the can body from which part of the heat exchange structure is removed and the shape of the can mouth. Specifically, the diameter of the can body of the present application is 164mm, the spindle speed of the spinning machine is 400-500rpm, the axial feed distance of the spinning machine is 3-10mm, and the rotary wheel swing angle is 0°-90°.

[0090] In some embodiments, step S3 further includes the following steps performed after step S33:

[0091] S34, cutting and dimension inspection of the spin-formed hydrogen storage tank body 1.

[0092] As can be seen from the above, the present application provides a method for preparing a metal hydride hydrogen storage tank with an internal heat exchange structure, which is used to prepare a metal hydride hydrogen storage tank with an internal heat exchange structure including a hydrogen storage tank body 1, a plurality of annular heat exchange columns 3 and a plurality of internal ribs 4, wherein the plurality of annular heat exchange columns 3 are concentrically arranged in the hydrogen storage tank body 1, and the plurality of internal ribs 4 are radially arranged in the hydrogen storage tank body 1 and are integrally formed with the hydrogen storage tank body 1 and the annular heat exchange columns 3. Since the hydrogen storage tank body 1, the annular heat exchange columns 3 and the internal ribs 4 are integrally formed, no contact thermal resistance is generated between the hydrogen storage tank body 1 and the internal ribs 4, and between the annular heat exchange columns 3 and the internal ribs 4. That is, the present application provides a method for preparing a metal hydride hydrogen storage tank with an internal heat exchange structure, which can solve the problem that the existing metal hydride hydrogen storage tank needs to install a plurality of heat-conducting structures on the inner side of the metal hydride hydrogen storage tank by welding, fastener locking and fixing, etc., resulting in the heat-conducting structure and the metal The problem of contact thermal resistance between metal hydride hydrogen storage tanks is solved, thereby effectively improving the heat transfer performance of the metal hydride hydrogen storage tank, and further effectively improving the hydrogen absorption and desorption rate of the metal hydride hydrogen storage tank. Since the annular heat exchange column 3, the hydrogen storage tank body 1 and the internal ribs 4 enclose a plurality of storage cavities, the hydrogen storage alloy bed 5 is filled in the plurality of storage cavities, and each storage cavity can support and separate the hydrogen storage alloy material powder, that is, the metal hydride hydrogen storage tank is equivalent to dispersing the hydrogen storage alloy material powder in a plurality of storage cavities. Therefore, the metal hydride hydrogen storage tank can effectively avoid the situation that the hydrogen storage alloy material powder accumulates at a local position in the metal hydride hydrogen storage tank after long-term use, thereby effectively avoiding the situation that the hydrogen storage alloy material powder accumulated at a local position in the metal hydride hydrogen storage tank will generate additional expansion stress when further absorbing hydrogen and expanding, thereby causing damage to the metal hydride hydrogen storage tank.

[0093] As can be seen from the above, the present application provides a metal hydride hydrogen storage tank with an internal heat exchange structure and a preparation method thereof, comprising a hydrogen storage tank body 1, a plurality of annular heat exchange columns 3 and a plurality of internal ribs 4, wherein the plurality of annular heat exchange columns 3 are concentrically arranged in the hydrogen storage tank body 1, and the plurality of internal ribs 4 are radially arranged in the hydrogen storage tank body 1 and are integrally formed with the hydrogen storage tank body 1 and the annular heat exchange columns 3. Since the hydrogen storage tank body 1, the annular heat exchange columns 3 and the internal ribs 4 are integrally formed, no contact thermal resistance is generated between the hydrogen storage tank body 1 and the internal ribs 4, and between the annular heat exchange columns 3 and the internal ribs 4. That is, the present application provides a metal hydride hydrogen storage tank with an internal heat exchange structure that can solve the problem that the existing metal hydride hydrogen storage tank needs to install a plurality of heat-conducting structures on the inner side of the metal hydride hydrogen storage tank by welding, fastener locking and fixing, etc., which causes the heat-conducting structure and the metal hydride hydrogen storage tank to generate heat resistance. The problem of contact thermal resistance is solved, thereby effectively improving the heat transfer performance of the metal hydride hydrogen storage tank, and further effectively improving the hydrogen absorption and desorption rate of the metal hydride hydrogen storage tank. Since the annular heat exchange column 3, the hydrogen storage tank body 1 and the internal ribs 4 enclose a plurality of storage cavities, the hydrogen storage alloy bed 5 is filled in the plurality of storage cavities, and each storage cavity can support and separate the hydrogen storage alloy material powder, that is, the metal hydride hydrogen storage tank is equivalent to dispersing the hydrogen storage alloy material powder in a plurality of storage cavities. Therefore, the metal hydride hydrogen storage tank can effectively avoid the situation where the hydrogen storage alloy material powder accumulates in a local position in the metal hydride hydrogen storage tank after long-term use, thereby effectively avoiding the situation where the hydrogen storage alloy material powder accumulated in a local position in the metal hydride hydrogen storage tank will generate additional expansion stress when further absorbing hydrogen and expanding, thereby causing damage to the metal hydride hydrogen storage tank.

[0094] In this document, relational terms such as first and second, etc. are used merely to distinguish one entity or operation from another entity or operation, but do not necessarily require or imply any such actual relationship or order between these entities or operations.

[0095] The above description is only an embodiment of the present application and is not intended to limit the protection scope of the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A method for preparing a metal hydride hydrogen storage tank with an internal heat exchange structure, which is used to prepare a metal hydride hydrogen storage tank with an internal heat exchange structure, characterized in that: The metal hydride hydrogen storage tank with an internal heat exchange structure comprises a hydrogen storage tank body, a hydrogen storage alloy bed, a plurality of annular heat exchange columns and a plurality of internal ribs, wherein the plurality of annular heat exchange columns are concentrically arranged in the hydrogen storage tank body, and different annular heat exchange columns have different inner diameters, a plurality of internal ribs are arranged in a circular array in the hydrogen storage tank body and are integrally formed with the hydrogen storage tank body and the plurality of annular heat exchange columns, the annular heat exchange columns, the hydrogen storage tank body and the internal ribs enclose a plurality of storage cavities, the hydrogen storage alloy bed is arranged in the plurality of storage cavities, the hydrogen storage tank body comprises a tank body, and at least one end of the tank body is provided with a tank mouth and a valve, and the method for preparing the metal hydride hydrogen storage tank with an internal heat exchange structure comprises the following steps: The aluminum rod is integrally extruded by an extrusion die to form a can body including the annular heat exchange column and the internal ribs; Removing the annular heat exchange columns and the internal ribs near the two ends of the tank body; Performing spin forming on both ends of the tank body from which part of the heat exchange structure is removed, so as to form a hydrogen storage tank body having at least one tank opening; The hydrogen storage alloy bed is uniformly filled into the hydrogen storage tank; Installing the valve and filter at the tank mouth to prepare the metal hydride hydrogen storage tank with an internal heat exchange structure; The metal hydride hydrogen storage tank with an internal heat exchange structure is activated.

2. The method for preparing a metal hydride hydrogen storage tank with an internal heat exchange structure according to claim 1, characterized in that: The step of integrally extruding the aluminum rod using an extrusion die to form a can body including the annular heat exchange column and the internal ribs comprises: The extrusion die and the aluminum rod are placed in a heating furnace for preheating; Installing an extrusion die into an extruder and placing an aluminum rod at a raw material inlet of the extruder, and extruding the aluminum rod by using the extrusion die to form a can body including the annular heat exchange column and the internal ribs; After the can body is cooled, the can body is straightened by using a stretching machine or a straightening machine; Use a sawing machine to saw the straightened can body; The sawn can body is sent to the aging furnace for aging treatment.

3. The method for preparing a metal hydride hydrogen storage tank with an internal heat exchange structure according to claim 1, characterized in that: The step of performing spin forming on both ends of the tank body with part of the heat exchange structure removed to form a hydrogen storage tank body having at least one tank opening comprises: Determine the clamping position according to the closing length of the can body with part of the heat exchange structure removed, and feed the can body with part of the heat exchange structure removed to the spinning machine according to the clamping position; Use a heating furnace and a heating gun to heat the mold used in spinning and the can body with some heat exchange structures removed to 280-320°C; The spindle speed, axial feed distance, number of wheel swings and angle of each wheel swing of the spinning machine are set according to the diameter of the tank body with part of the heat exchange structure removed and the shape of the tank mouth. The two ends of the tank body with part of the heat exchange structure removed are spun using the set spinning machine to form a hydrogen storage tank body with at least one tank mouth.

4. A metal hydride hydrogen storage tank with an internal heat exchange structure, characterized in that: The metal hydride hydrogen storage tank with an internal heat exchange structure is manufactured by the method for preparing a metal hydride hydrogen storage tank with an internal heat exchange structure according to any one of claims 1 to 3, and the metal hydride hydrogen storage tank with an internal heat exchange structure comprises: A hydrogen storage tank body, on which a valve is provided; A plurality of annular heat exchange columns are concentrically arranged in the hydrogen storage tank body; A plurality of internal ribs are radially arranged in the hydrogen storage tank body and are integrally formed with the hydrogen storage tank body and the annular heat exchange column, wherein the annular heat exchange column, the hydrogen storage tank body and the internal ribs enclose a plurality of storage chambers; The hydrogen storage alloy bed is filled in the plurality of storage chambers.

5. The metal hydride hydrogen storage tank with an internal heat exchange structure according to claim 4, characterized in that: The wall thickness of the annular heat exchange column close to the center of the hydrogen storage tank body is smaller than the wall thickness of the annular heat exchange column far from the center of the hydrogen storage tank body.

6. The metal hydride hydrogen storage tank with an internal heat exchange structure according to claim 4, characterized in that: The thickness of the internal ribs gradually increases in a direction away from the center of the hydrogen storage tank.

7. The metal hydride hydrogen storage tank with an internal heat exchange structure according to claim 4, characterized in that: The ratio of the inner diameters of adjacent annular heat exchange columns is 1:2-1:

3.

8. The metal hydride hydrogen storage tank with an internal heat exchange structure according to claim 4, characterized in that: The metal hydride hydrogen storage tank with an internal heat exchange structure includes two annular heat exchange columns, and the ratio of the wall thickness of the annular heat exchange column away from the center of the hydrogen storage tank body to the wall thickness of the annular heat exchange column close to the center of the hydrogen storage tank body is 1.2:1-1.5:

1.

9. The metal hydride hydrogen storage tank with an internal heat exchange structure according to claim 4, characterized in that: The number of the internal ribs is 8-12.

10. The metal hydride hydrogen storage tank with an internal heat exchange structure according to claim 4, characterized in that: The metal hydride hydrogen storage tank with an internal heat exchange structure further comprises a filter sheet, and the filter sheet is arranged between the hydrogen storage tank body and the valve.

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