Hydrogen storage powder grid pressing piece, assembling method thereof and solid hydrogen storage device

Abstract

The invention provides a hydrogen storage powder grid pressing piece, an assembling method thereof and a solid hydrogen storage device.The hydrogen storage powder grid pressing piece comprises a limiting component and a cake body bed layer, the limiting component is provided with a plurality of grids, the cake body bed layer is embedded in the limiting component and comprises a plurality of sub cake bodies, the corresponding grids are completely filled with each sub cake body, and the cake body bed layer comprises a plurality of sub cake bodies. The materials of the cake body bed layer comprise solid hydrogen storage powder, a heat transfer material and an adhesive, and the heat transfer material comprises at least one of copper, aluminum and expanded graphite. According to the solid hydrogen storage device, the cake body bed layer is embedded in the limiting component, and each sub-cake body in the cake body bed layer is completely filled in the corresponding grid, so that the stress concentration of the tank body caused by the subsequent hydrogen absorption expansion of the solid hydrogen storage powder can be effectively eliminated, and the solid hydrogen storage device can safely and efficiently store hydrogen; meanwhile, the cake body bed layer contains a high heat transfer material, so that the heat transfer performance of the solid hydrogen storage powder can be effectively improved, and the hydrogen charging and discharging performance of the solid hydrogen storage device is further improved.

Description

Technical Field

[0001] The present invention relates to the technical field of hydrogen storage and production, and in particular to a hydrogen storage powder grid pressing part and an assembly method thereof, and a solid-state hydrogen storage device. Background Art

[0002] Hydrogen energy is a renewable clean energy with the advantages of high energy density, clean and environmentally friendly. The utilization of hydrogen energy mainly includes three major technologies: large-scale production of hydrogen, hydrogen fuel cell technology and hydrogen source technology. How to store hydrogen safely and efficiently is an important issue that needs to be solved urgently.

[0003] Among the many hydrogen source technologies, solid-state hydrogen storage technology has the characteristics of high material hydrogen storage density, safe and convenient storage and transportation, fast hydrogen release response speed, high volume hydrogen storage density, no greenhouse gas emissions, and the ability to match proton exchange membrane fuel cells. Solid-state hydrogen storage has low pressure, low leakage risk, good reliability, and great promotion prospects. Common solid-state hydrogen storage materials such as AB-type TiFe hydrogen storage materials, AB2-type TiMn hydrogen storage materials, AB5-type LaNi5 hydrogen storage materials, and vanadium-based solid solution hydrogen storage materials are usually loaded in pressure vessels in the form of powders. In order to pursue a higher hydrogen storage density of the device, the packing compactness of the hydrogen storage powder will be greater. The expansion of the hydrogen storage alloy will cause stress concentration in the filling container, damage the sealing structure of the pressure vessel, and increase the possibility of hydrogen leakage.

[0004] Therefore, there is an urgent need for a hydrogen storage powder grid pressed part and an assembly method thereof, as well as a solid-state hydrogen storage device to solve the above-mentioned technical problems. Summary of the invention

[0005] The object of the present invention is to provide a hydrogen storage powder grid pressed part and an assembly method thereof, and a solid-state hydrogen storage device, which can effectively avoid the technical problem of tank stress concentration caused by the expansion of hydrogen storage alloy due to hydrogen absorption.

[0006] In order to solve the above technical problems, the present invention first provides a hydrogen storage powder grid pressed part, including a limiting component with multiple grids and a cake bed layer embedded in the limiting component, the cake bed layer includes multiple sub-cakes, each sub-cake is completely filled in the corresponding grid; The material of the cake bed layer includes solid hydrogen storage powder, heat transfer material and adhesive, and the heat transfer material includes at least one of copper, aluminum and expanded graphite.

[0007] Preferably, the solid-state hydrogen storage powder includes any one of a Ti-based solid solution hydrogen storage material, a V-based solid solution hydrogen storage material and an AB5-type solid solution hydrogen storage material.

[0008] Preferably, the adhesive includes any one of polytetrafluoroethylene, fluororubber, perfluoroether rubber and vulcanized silicone rubber.

[0009] Preferably, the limiting member is made of magnesium alloy material.

[0010] Preferably, the hydrogen storage powder grid press comprises a first through hole located in the central area of ​​the limiting member and a plurality of second through holes arranged around the first through hole, and the first through hole and the second through holes completely penetrate the hydrogen storage powder grid press; The spacing between each second through hole and the first through hole is equal, and the spacing between two adjacent second through holes is equal.

[0011] Accordingly, the present invention also provides a method for assembling a hydrogen storage powder grid pressed part as described above, the method comprising: S10, providing a compaction bottom plate, wherein the compaction bottom plate includes a plurality of columnar protrusions; S20, providing a limiting member, and engaging the limiting member in the compacted bottom plate, wherein each columnar protrusion penetrates a corresponding grid; S30, filling a mixed powder formed by mixing solid hydrogen storage powder, heat transfer material and binder into the compaction bottom plate; S40, applying a compaction force to flatten and compact the mixed powder to obtain a cake bed layer; S50, demoulding the cake bed layer to remove the compaction bottom plate, and finally obtaining a hydrogen storage powder grid pressed part.

[0012] Preferably, in step S30, the packing density of the mixed powder is 3 to 5 kg / L.

[0013] Preferably, in step S40, the compaction force is 300-500 MPa.

[0014] Correspondingly, the present invention further provides a solid-state hydrogen storage device, comprising a hydrogen storage container having a accommodating cavity, in which a plurality of hydrogen storage powder grid presses as described in any one of the above items are arranged, or a plurality of hydrogen storage powder grid presses assembled by an assembly method of the hydrogen storage powder grid presses as described in any one of the above items are arranged.

[0015] Preferably, a heat exchange tube and an air guide tube are further provided in the accommodating cavity. The heat exchange tube is a U-shaped tube. Both ends of the U-shaped tube and the air guide tube penetrate a plurality of hydrogen storage powder grid pressed parts.

[0016] The beneficial effects of the present invention are as follows: Different from the prior art, the present invention provides a hydrogen storage powder grid press part and its assembly method, and a solid hydrogen storage device. The hydrogen storage powder grid press part includes a limiting member with multiple grids and a cake bed layer embedded in the limiting member. The cake bed layer includes multiple sub-cakes, each sub-cake is completely filled in the corresponding grid, wherein the material of the cake bed layer includes solid hydrogen storage powder, heat transfer material and adhesive, and the heat transfer material includes at least one of copper, aluminum and expanded graphite. The present invention embeds the cake bed layer in the limiting member, and each sub-cake in the cake bed layer is completely filled in the corresponding grid, so that the cake bed layer with solid hydrogen storage powder is tightly limited in the grid, thereby effectively eliminating the tank stress concentration caused by the subsequent hydrogen absorption expansion of the solid hydrogen storage powder, thereby enabling the solid hydrogen storage device to store hydrogen safely and efficiently; at the same time, the cake bed layer contains high heat transfer material, which can effectively improve the heat transfer performance of the solid hydrogen storage powder, thereby improving the hydrogen charging and discharging performance of the solid hydrogen storage device. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A schematic structural diagram of a position-limiting component in a hydrogen storage powder grid press provided by the present invention; Figure 2 A schematic diagram of the structure of a hydrogen storage powder grid press provided by the present invention; Figure 3 A flow chart of the assembly method of the hydrogen storage powder grid pressed part provided by the present invention; Figure 4 A schematic diagram of the structure of a compacting bottom plate in the assembly method of a hydrogen storage powder grid pressed part provided by the present invention; Figure 5 A schematic diagram of the structure of the assembled compacting bottom plate and the limiting member in the assembly method of the hydrogen storage powder grid pressed part provided by the present invention; Figure 6 A schematic diagram of the structure of the hydrogen storage powder grid pressed parts and the heat exchange tubes after being assembled in the solid-state hydrogen storage device provided by the present invention; Figure 7 A hydrogen release curve diagram of the solid-state hydrogen storage device provided in Example 1 of the present invention at different temperatures, pressures and hydrogen release flow rates; Figure 8a A graph showing the circumferential and axial hydrogen absorption strain of the hydrogen storage container at point 2 on the tank surface in the solid-state hydrogen storage device provided in Example 1 of the present invention; Figure 8b A graph showing the circumferential and axial hydrogen absorption strain of the hydrogen storage container at point 4 on the tank surface in the solid-state hydrogen storage device provided in Example 1 of the present invention; In the figure, 100 is a hydrogen storage powder grid pressing part; 10 is a limiting member; 11 is a grid; 101 is a first through hole; 102 is a second through hole; 20 is a cake bed layer; 201 is a sub-cake; 30 is a compacting bottom plate; 31 is a bottom support plate; 32 is a side plate; 33 is a columnar protrusion; 40 is a heat exchange tube. DETAILED DESCRIPTION

[0018] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0019] In view of the technical problem of tank stress concentration caused by hydrogen absorption expansion of existing hydrogen storage alloys, the present invention provides a hydrogen storage powder grid press 100 and its assembly method, and a solid-state hydrogen storage device, which embeds a cake bed 20 in a limiting member 10, and each sub-cake 201 in the cake bed 20 is completely filled in the corresponding grid 11, so that the cake bed 20 with solid hydrogen storage powder is tightly confined in the grid 11, thereby effectively eliminating the tank stress concentration caused by the subsequent hydrogen absorption expansion of the solid hydrogen storage powder, and thus enabling the solid-state hydrogen storage device to store hydrogen safely and efficiently.

[0020] To achieve the above object, the present invention provides the following technical solutions: See also Figure 1 to Figure 2 , Figure 1 This is a schematic structural diagram of the limiting component 10 in the hydrogen storage powder grid pressed component 100 provided by the present invention. Figure 2 Schematic diagram of the structure of the hydrogen storage powder grid pressed component 100 provided by the present invention; wherein the hydrogen storage powder grid pressed component 100 comprises a limiting member 10 having a plurality of grids 11 and a cake bed layer 20 embedded in the limiting member 10, the cake bed layer 20 comprises a plurality of sub-cakes 201, and each sub-cake 201 is completely filled in the corresponding grid 11; The material of the cake bed layer 20 includes solid hydrogen storage powder, heat transfer material and adhesive, and the heat transfer material includes at least one of copper, aluminum and expanded graphite.

[0021] In the embodiment of the present invention, the limiting member 10 has a plurality of grids 11 of identical shapes, and each grid 11 has the same size; the limiting member 10 can connect loose materials into a whole, thereby improving the integrity and cooperative working ability of the materials.

[0022] Preferably, the limiting member 10 is made of a lightweight magnesium alloy material with high yield strength and high thermal conductivity.

[0023] In an embodiment of the present invention, the solid-state hydrogen storage powder includes any one of a Ti-based solid solution hydrogen storage material, a V-based solid solution hydrogen storage material, and an AB5-type solid solution hydrogen storage material.

[0024] In an embodiment of the present invention, the solid hydrogen storage powder includes an adhesive, and the adhesive includes any one of polytetrafluoroethylene, fluororubber, perfluoroether rubber and vulcanized silicone rubber; wherein the addition of the adhesive can promote the solid hydrogen storage powder and the heat transfer material to be bonded into a whole.

[0025] In the embodiment of the present invention, the cake bed layer 20 further includes a heat transfer material, and the heat transfer material includes at least one of copper, aluminum and expanded graphite.

[0026] Specifically, the thermal conductivity of solid hydrogen storage powder itself is relatively low, generally around 1W / (m*K), and its thermal conductivity is similar to that of thermal insulation materials; when solid hydrogen storage powder reacts with hydrogen, the solid hydrogen storage powder will experience 10% to 25% lattice expansion when absorbing hydrogen, and will shrink when releasing hydrogen. After repeated cycles of absorbing and releasing hydrogen, solid hydrogen storage powder will become pulverized, which will further reduce the thermal conductivity of solid hydrogen storage powder. The obstruction of heat transfer will seriously affect the charging and releasing performance of the solid hydrogen storage device.

[0027] Furthermore, since the cake bed layer 20 contains high heat transfer material, the heat transfer performance of the solid hydrogen storage powder can be effectively improved, thereby improving the charging and discharging performance of the solid hydrogen storage device.

[0028] In the embodiment of the present invention, the hydrogen storage powder grid press 100 includes a first through hole 101 located in the central area of ​​the limiting member 10 and a plurality of second through holes 102 arranged around the first through hole 101, and the first through hole 101 and the second through holes 102 completely penetrate the hydrogen storage powder grid press 100; The spacing between each second through hole 102 and the first through hole 101 is equal, and the spacing between two adjacent second through holes 102 is equal.

[0029] Specifically, the first through hole 101 is designed to allow the air guide pipe to completely penetrate the hydrogen storage powder grid press part 100 later, and the second through hole 102 is designed to allow the heat exchange tube 40 to completely penetrate the hydrogen storage powder grid press part 100 later.

[0030] See also Figure 3 , Figure 3 A flow chart of an assembly method of a hydrogen storage powder grid pressed component 100 provided by the present invention; wherein the method comprises: S10 , providing a compacting bottom plate 30 , wherein the compacting bottom plate 30 includes a plurality of columnar protrusions 33 .

[0031] Specifically, step S10 also includes: See also Figure 4 , Figure 4 A structural schematic diagram of a compacted bottom plate 30 in an assembly method of a hydrogen storage powder grid press 100 provided in the present invention; wherein a compacted bottom plate 30 is provided, the compacted bottom plate 30 comprises a bottom support plate 31 and side plates 32 located around the edges of the bottom support plate 31, the bottom support plate 31 and the side plates 32 are integrally formed, and the shape of the bottom support plate 31 is preferably circular.

[0032] Specifically, the compaction bottom plate 30 includes a plurality of columnar protrusions 33 , each of which is provided with a through hole that completely penetrates the bottom support plate 31 , and at least one columnar protrusion 33 is located at the center of the bottom support plate 31 .

[0033] S20 , providing a limiting member 10 , and engaging the limiting member 10 in the compacting bottom plate 30 , wherein each columnar protrusion 33 penetrates the corresponding grid 11 .

[0034] Specifically, step S20 also includes: First, a limiting member 10 is provided, and the limiting member 10 has a plurality of square grids 11; Afterwards, the limiting member 10 is loaded on the bottom support plate 31, and each columnar protrusion 33 penetrates the corresponding grid 11, so that the limiting member 10 is engaged in the compacted bottom plate 30, as shown in FIG. Figure 5 As shown, Figure 5 It is a schematic structural diagram of the assembled compacting bottom plate 30 and the limiting member 10 in the assembly method of the hydrogen storage powder grid pressed part 100 provided by the present invention.

[0035] S30 , filling the compaction bottom plate 30 with a mixed powder formed by mixing the solid hydrogen storage powder, the heat transfer material and the binder.

[0036] Specifically, step S30 also includes: Solid hydrogen storage powder, heat transfer material with high heat transfer performance and adhesive are premixed in a V-type mixer in a certain proportion to form mixed powder. The mixed powder is then filled into the compaction bottom plate 30 at a certain filling density.

[0037] Preferably, in step S30, the packing density of the mixed powder is 3 to 5 kg / L; wherein, the appropriate packing density helps to ensure the performance of the hydrogen storage material. If the packing density is too low, it may lead to a reduction in the effective hydrogen storage capacity in the hydrogen storage container, reducing the hydrogen storage efficiency of the entire system. In the packing density range of 3 to 5 kg / L, the solid-state hydrogen storage powder can be arranged relatively tightly, which not only ensures sufficient hydrogen storage capacity, but also makes the diffusion and adsorption process of hydrogen in the powder more efficient. At the same time, when the packing density is 3 to 5 kg / L, the heat transfer material can form a relatively uniform distribution in the solid-state hydrogen storage powder, ensuring that heat can be transferred quickly and avoiding local overheating or overcooling. This is crucial to maintaining the temperature stability of the hydrogen storage system, because temperature changes will directly affect the hydrogen absorption and desorption performance of the hydrogen storage material.

[0038] S40, applying a compaction force to flatten and compact the mixed powder to obtain a cake bed layer 20; Specifically, step S40 also includes: The mixed powder is flattened and compacted by applying a compaction force to obtain a cake bed layer 20; wherein the compaction force is 300-500 MPa; within this compaction force range, the mixed powder can be fully compacted and the gaps between particles are greatly reduced. This makes the cake bed layer 20 have a higher density and a uniform structure, which is conducive to improving the stability and reliability of the cake bed layer 20.

[0039] Specifically, a higher compaction force helps to increase the hydrogen storage density of the mixed powder. Under a pressure of 300-500 MPa, the crystal structure of the hydrogen storage powder may undergo certain changes, making hydrogen molecules easier to be adsorbed and stored. At the same time, the compacted cake bed 20 can improve the thermal conductivity efficiency of the heat transfer material in the mixed powder. Under a pressure of 300-500 MPa, the contact between the heat transfer material and the hydrogen storage powder is closer, and the thermal resistance is reduced, which is conducive to the rapid transfer and uniform distribution of heat. This is critical for maintaining the temperature stability of the hydrogen storage system and controlling the rate of hydrogen absorption and desorption reactions.

[0040] S50, demoulding the cake bed layer 20 to remove the compacting bottom plate 30, and finally obtaining the hydrogen storage powder grid pressed part 100.

[0041] Specifically, step S50 also includes: The compacted cake bed layer 20 is demoulded to remove the compaction bottom plate 30 , and finally a hydrogen storage powder grid pressed part 100 is obtained; wherein the compacted cake bed layer 20 is integrated with a high-strength limiting member 10 to obtain a hydrogen storage powder grid pressed part 100 .

[0042] Specifically, while adding high heat transfer material to increase the heat transfer performance of the solid hydrogen storage powder, the presence of the high-strength limiting member 10 provides the entire cake bed 20 with good strength, which is conducive to maintaining the original shape during the assembly process without collapse or cracking.

[0043] Correspondingly, the present invention further provides a solid-state hydrogen storage device, comprising a hydrogen storage container having a containing cavity, in which a plurality of hydrogen storage powder grid presses 100 as described in any one of the above items are arranged, or a plurality of hydrogen storage powder grid presses 100 assembled by an assembly method of the hydrogen storage powder grid presses 100 as described in any one of the above items are arranged.

[0044] In an embodiment of the present invention, a heat exchange tube 40 and an air duct are further provided in the accommodating cavity. The heat exchange tube 40 is a U-shaped tube filled with water to realize heat exchange of the solid-state hydrogen storage device. Both ends of the U-shaped tube and the air duct penetrate multiple hydrogen storage powder grid press parts 100.

[0045] Specifically, in order to improve the heat transfer efficiency of the solid-state hydrogen storage device, a single external immersion water bath heat exchange form is often insufficient for hydrogen storage containers with larger diameters. It is usually necessary to use an embedded heat exchange tube 40 as auxiliary heat exchange. In order to simplify the external interface of the device's water circuit, the heat exchange tube 40 is in the form of a U-shaped tube to achieve water circulation inside the solid-state hydrogen storage device.

[0046] See also Figure 6 , Figure 6 It is a schematic diagram of the structure of the hydrogen storage powder grid press 100 and the heat exchange tube 40 after assembly in the solid hydrogen storage device provided by the present invention; wherein, since the compaction bottom plate 30 includes a plurality of columnar protrusions 33, each columnar protrusion 33 is provided with a through hole that completely penetrates the bottom support plate 31. Therefore, the compacted hydrogen storage powder grid press 100 includes a first through hole 101 located in the central area of ​​the limiting member 10 and a plurality of second through holes 102 arranged around the first through hole 101. The first through hole 101 and the second through hole 102 both completely penetrate the hydrogen storage powder grid press 100, and the spacing between each second through hole 102 and the first through hole 101 is equal, and the spacing between two adjacent second through holes 102 is equal.

[0047] Specifically, each hydrogen storage powder grid press 100 can be inserted into two heat exchange tubes 40 (U-shaped tubes) in turn through the four reserved second through holes 102; wherein each U-shaped tube is equipped with a sliding damping device, so that each hydrogen storage powder grid press 100 can slowly slide through the U-shaped tube and finally be assembled in the hydrogen storage container.

[0048] Specifically, since the cake bed layer 20 itself has a certain strength, it does not need to continue mechanical vibration during the filling process, and will not fall and break due to gravitational potential energy, thereby protecting the solid hydrogen storage container.

[0049] Specifically, the first through hole 101 in each hydrogen storage powder grid press part 100 is used to install the air duct, so as to prevent the air duct from being squeezed and broken during the process of filling the hydrogen storage powder grid press parts 100. After all the hydrogen storage powder grid press parts 100 are put on the U-shaped tube, the air duct is inserted through the first through hole 101.

[0050] The above-mentioned hydrogen storage powder grid pressed component 100 and its assembly method, and the solid-state hydrogen storage device are described in detail below through specific embodiments.

[0051] Embodiment 1: Embodiment 1 of the present invention provides an assembly method of a hydrogen storage powder grid pressed component 100, which specifically includes the following steps: Step (1): 1200 kg of V-series solid solution hydrogen storage alloy with a particle size of 50-100 mesh, 50 kg of oxygen-free copper powder with a particle size of 50-100 mesh, 30 kg of expanded graphite and 16 kg of PTFE binder are uniformly mixed, and placed in a V-type mixer in sequence for further mixing to obtain a mixed powder.

[0052] Step (2): Fill the mixed powder into a compaction mold formed by assembling the limiting member 10 and the compaction bottom plate 30; wherein the diameter of the compaction mold is 500 mm, and the depth of the compaction mold is 14 mm; and the filling amount of the mixed powder is filled according to a filling density of 4.6 kg / L.

[0053] Step (3): Apply a compaction force of 400 MPa to flatten and compact the mixed powder to obtain a cake bed layer 20.

[0054] Step (4): demolding the compacted cake bed 20 to remove the compaction bottom plate 30, and finally obtaining a hydrogen storage powder grid pressed part 100; wherein the volume of a single hydrogen storage powder grid pressed part 100 is 2.75L, and the filling amount of the mixed powder is 12.63kg.

[0055] Embodiment 1 of the present invention provides a solid-state hydrogen storage device, including a hydrogen storage container having a receiving cavity, wherein a plurality of hydrogen storage powder grid pressed parts 100 as described above are arranged in the receiving cavity, and the assembly process thereof is as follows: First, 100 hydrogen storage powder grid presses 100 are inserted into two U-shaped tubes in turn through the four reserved second through holes 102; since the U-shaped tube is equipped with a sliding damping device, each hydrogen storage powder grid press 100 can slowly slide through the U-shaped tube and finally be assembled in the hydrogen storage container; wherein, the diameter of the U-shaped tube is 16 mm and the wall thickness is 1.5 mm; the inner diameter of the hydrogen storage container is 500 mm and the length is 1500 mm; the total filling amount of the mixed powder is 1263 kg.

[0056] Secondly, the hydrogen storage container was sealed to measure its charging and discharging performance. To verify its heat transfer performance, a high flow rate hydrogen discharge (45°C, 3m 3 / min) and tank surface strain test.

[0057] See also Figure 7 , Figure 7 The hydrogen release curve diagram of the solid-state hydrogen storage device provided in Example 1 of the present invention at different temperatures, pressures and hydrogen release flow rates; wherein, Figure 7 It can be seen that during the period from the 5th minute to the 70th minute, the tank temperature of the solid-state hydrogen storage device gradually increased from 5°C to 45°C, the pressure in the tank gradually decreased from 2.5Mpa to 0.1Mpa, and the hydrogen discharge flow rate was maintained at 3m 3 / min remains unchanged, and the cumulative hydrogen discharge flow rate increases uniformly to 210m 3 The above results indicate that: under low temperature conditions, the hydrogen storage powder grid pressed component 100 exhibits good hydrogen release performance after mixing and pressing, and can maintain a relatively high hydrogen supply flow rate throughout the entire process.

[0058] See also Figure 8a to Figure 8b , Figure 8a A graph showing the circumferential and axial hydrogen absorption strain of the hydrogen storage container at point 2 on the tank surface in the solid-state hydrogen storage device provided in Example 1 of the present invention; Figure 8b The circumferential and axial hydrogen absorption strain curves of the hydrogen storage container in the solid-state hydrogen storage device provided in Example 1 of the present invention at point 4 on the tank surface; wherein, when the hydrogen storage powder grid pressed part 100 after mixed pressing is in the hydrogen release process, the strain rate of the hydrogen storage container in the solid-state hydrogen storage device provided in Example 1 of the present invention at different tank surface sites is 0, which indicates that there is almost no stress in the hydrogen storage container during the hydrogen release process.

[0059] Depend on Figure 8a It can be seen that when the hydrogen storage powder grid pressed part 100 after mixed pressing is in the hydrogen absorption process, the circumferential strain rate of the hydrogen storage container in the solid hydrogen storage device provided in Example 1 of the present invention at point No. 2 on the tank surface is -0.02% to 0.01%, and the axial strain rate at point No. 2 on the tank surface is -0.06% to 0.01%.

[0060] Depend on Figure 8bIt can be seen that when the hydrogen storage powder grid pressed part 100 after mixed pressing is in the hydrogen absorption process, the circumferential strain rate of the hydrogen storage container in the solid hydrogen storage device provided in Example 1 of the present invention at point No. 4 on the surface of the tank body is -0.04% to 0.05%, and the axial strain rate at point No. 4 on the surface of the tank body is -0.19% to 0.02%.

[0061] Specifically, the above results show that under the premise of maintaining high volume and high hydrogen storage density, the deformation of the solid-state hydrogen storage device during the hydrogen absorption process is in the elastic deformation region, which ensures the safety and reliability of the solid-state hydrogen storage device.

[0062] Compared with the prior art, the present invention has the following beneficial effects: (1) The first through hole 101 in the hydrogen storage powder grid pressed component 100 provided by the present invention is used to install the air guide tube, which can prevent the air guide tube from being squeezed and broken during the process of filling the hydrogen storage powder.

[0063] (2) The hydrogen storage powder grid pressed part 100 provided by the present invention can effectively improve the heat transfer performance of the solid hydrogen storage material by adding high heat transfer performance materials such as copper powder and expanded graphite.

[0064] (3) The limiting member 10 in the hydrogen storage powder grid pressing part 100 provided by the present invention is made of a lightweight magnesium alloy material with high yield strength and high thermal conductivity, and maintains a certain strength during the pressing process. It divides the mixed powder into a plurality of tiny grids 11, further increasing the heat transfer performance of the cake bed 20 while effectively preventing the hydrogen storage powder grid pressing part 100 with a larger diameter from collapsing during transportation and assembly. After the hydrogen storage material absorbs hydrogen and expands, the compacted solid hydrogen storage material is tightly limited due to the restraint of the high-strength limiting member 10 buried inside the solid hydrogen storage material. In addition, the compaction process itself makes it have a macroscopic anti-deformation effect. Therefore, the deformation amount caused by the hydrogen absorption and expansion of the solid hydrogen storage material can be effectively eliminated for the solid hydrogen storage device.

[0065] It should be noted that the above embodiments all belong to the same inventive concept, and the descriptions of the embodiments have different focuses. For the parts not described in detail in the individual embodiments, reference can be made to the descriptions in other embodiments. The above embodiments only express the implementation methods of the present invention, and the descriptions are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be based on the attached claims.

Claims

1. A hydrogen storage powder grid pressed part, characterized in that: It comprises a limiting component with a plurality of grids and a cake bed layer embedded in the limiting component, wherein the cake bed layer comprises a plurality of sub-cakes, and each of the sub-cakes is completely filled in the corresponding grid; The material of the cake bed layer includes solid hydrogen storage powder, heat transfer material and adhesive, and the heat transfer material includes at least one of copper, aluminum and expanded graphite.

2. The hydrogen storage powder grid pressed part according to claim 1, characterized in that: The solid-state hydrogen storage powder includes any one of a Ti-based solid solution hydrogen storage material, a V-based solid solution hydrogen storage material, and an AB5-type solid solution hydrogen storage material.

3. The hydrogen storage powder grid pressed part according to claim 1, characterized in that: The adhesive includes any one of polytetrafluoroethylene, fluorine rubber, perfluoroether rubber and vulcanized silicone rubber.

4. The hydrogen storage powder grid pressed part according to claim 1, characterized in that: The limiting component is made of magnesium alloy material.

5. The hydrogen storage powder grid pressed part according to claim 1, characterized in that: The hydrogen storage powder grid pressed part comprises a first through hole located in the central area of ​​the limiting member and a plurality of second through holes arranged around the first through hole, wherein the first through hole and the second through holes completely penetrate the hydrogen storage powder grid pressed part; The distance between each of the second through holes and the first through hole is equal, and the distance between two adjacent second through holes is equal.

6. A method for assembling a hydrogen storage powder grid pressed part according to any one of claims 1 to 5, characterized in that: The method comprises: S10, providing a compaction bottom plate, wherein the compaction bottom plate comprises a plurality of columnar protrusions; S20, providing the limiting member, and engaging the limiting member in the compacting bottom plate, wherein each of the columnar protrusions penetrates the corresponding grid; S30, filling the mixed powder formed by mixing the solid hydrogen storage powder, the heat transfer material and the adhesive into the compacting bottom plate; S40, applying a compaction force to flatten and compact the mixed powder to obtain the cake bed layer; S50, demoulding the cake bed to remove the compacting bottom plate, and finally obtaining the hydrogen storage powder grid pressed part.

7. The method for assembling a hydrogen storage powder grid pressed part according to claim 6, characterized in that: In the step S30, the packing density of the mixed powder is 3 to 5 kg / L.

8. The method for assembling a hydrogen storage powder grid pressed part according to claim 6, characterized in that: In the step S40, the compaction force is 300-500 MPa.

9. A solid-state hydrogen storage device, characterized in that: It comprises a hydrogen storage container with a containing cavity, in which a plurality of hydrogen storage powder grid pressed parts as described in any one of claims 1 to 5 are arranged, or a plurality of hydrogen storage powder grid pressed parts assembled by the assembly method of the hydrogen storage powder grid pressed parts as described in any one of claims 6 to 8 are arranged.

10. The solid-state hydrogen storage device according to claim 9, characterized in that: A heat exchange tube and an air guide tube are also provided in the accommodating cavity. The heat exchange tube is a U-shaped tube. Both ends of the U-shaped tube and the air guide tube penetrate the plurality of hydrogen storage powder grid pressed parts.

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