Solid hydrogen storage material tabletting device, hydrogen permeability testing system and use method of hydrogen permeability testing system

Abstract

The invention provides a solid hydrogen storage material tabletting device, a hydrogen permeability testing system and a use method thereof, and relates to the technical field of hydrogen permeability testing of solid hydrogen storage materials. The solid hydrogen storage material tabletting device comprises a pressing rod, a die sleeve and a die bottom, the pressing rod and the die bottom are detachably inserted into the two opposite ends of the die sleeve respectively, the pressing rod can abut against the die bottom in the die sleeve, and the pressing rod and the die bottom are matched to be used for applying pressure to a solid hydrogen storage material in the die sleeve so as to press a tablet in the die sleeve; a first gas guide assembly and a second gas guide assembly which are detachable can be installed at the two ends of the die sleeve. The solid hydrogen storage material tabletting device fills the blank in the prior art in the aspect of testing the hydrogen permeability of the solid hydrogen storage material in real time after the solid hydrogen storage material is tableted, so that a user can evaluate the performance of the solid hydrogen storage material tabletting more conveniently.

Description

Technical Field

[0001] The present invention relates to the technical field of hydrogen permeability testing of solid hydrogen storage materials, and in particular to a solid hydrogen storage material tablet pressing device, a hydrogen permeability testing system and a use method thereof. Background Art

[0002] Solid-state hydrogen storage material powders can be molded into tablets by mixing additives to improve apparent density, thermal conductivity, and safety of use. However, as the additive content increases and the molding pressure increases, the hydrogen storage capacity, porosity, and hydrogen mass transfer performance inside the tablets will inevitably decrease, resulting in a decrease in the hydrogen absorption / desorption rate under working conditions.

[0003] To evaluate the effect of the molding process on the heat and mass transfer performance of the hydrogen storage bed, it is necessary to consider the combined effects of thermal conductivity and hydrogen permeability. However, the existing technology does not have a device for testing the hydrogen permeability of solid-state hydrogen storage materials immediately after film production, which brings inconvenience to the evaluation.

[0004] There is currently no effective technical solution to the above problems. Summary of the invention

[0005] The purpose of the present invention is to provide a solid-state hydrogen storage material tabletting device, a hydrogen permeability testing system and a method of using the same, which fills the gap in the prior art for immediately testing the hydrogen permeability of solid-state hydrogen storage materials after tableting, allowing users to more conveniently evaluate the performance of solid-state hydrogen storage material tablets.

[0006] In a first aspect, the present invention provides a solid hydrogen storage material tablet pressing device, comprising a pressing rod, a mold sleeve and a mold bottom, wherein the pressing rod and the mold bottom are detachably plugged into opposite ends of the mold sleeve, respectively, the pressing rod can abut against the mold bottom inside the mold sleeve, and the pressing rod and the mold bottom cooperate to pressurize the solid hydrogen storage material in the mold sleeve to press out a tablet inside the mold sleeve; The pressing sheet can separate the interior of the mold sleeve into a first air cavity and a second air cavity that are independent of each other. The end of the mold sleeve near the first air cavity can be installed with a detachable first air guide component, the first air guide component includes a first air guide tube, and the first air guide tube can be sealed and connected to the first air cavity; the end of the mold sleeve near the second air cavity can be installed with a detachable second air guide component, the second air guide component includes a second air guide tube, and the second air guide tube can be sealed and connected to the second air cavity.

[0007] The solid-state hydrogen storage material tablet pressing device provided by the present invention can be directly used for hydrogen permeability testing after tableting is completed, thereby quickly testing tableting performance in a more efficient and convenient manner, filling the gap in the technical level and reducing the inconvenience of the evaluation process.

[0008] Furthermore, the first air guide component further includes a first nut and a first copper washer, the first nut can be threadedly connected to the mold sleeve, and the first copper washer can be crimped between the first nut and the mold sleeve; The second air guide component also includes a second nut and a second copper washer. The second nut can be threadedly connected to the mold sleeve, and the second copper washer can be crimped between the second nut and the mold sleeve.

[0009] The threaded connection method combined with the use of copper gaskets can improve the air tightness of the air cavity, thereby helping to improve the accuracy of subsequent tests and the reliability of test results.

[0010] In a second aspect, the present invention provides a hydrogen permeability test system, comprising the above-mentioned solid hydrogen storage material tablet pressing device, a mass flow controller, a pressure transmitter and an exhaust pipe, wherein the mass flow controller, the solid hydrogen storage material tablet pressing device and the exhaust pipe are sequentially connected through a pipeline; the mass flow controller is used to control the instantaneous flow rate of the outflowing hydrogen; The first air guide pipe is connected to the mass flow controller; the second air guide pipe is connected to one end of the exhaust pipe, and the other end of the exhaust pipe is connected to the outside; The pressure transmitter is connected to the pipeline between the mass flow controller and the solid hydrogen storage material tablet pressing device; the pressure transmitter is used to measure the air pressure of the first air cavity.

[0011] The installation process is convenient and there is no need to remove the tablet from the mold sleeve, which simplifies the test steps and improves the test efficiency. It also reduces the risk of damage to the tablet during the transfer process after it is removed, reducing many inconveniences in the user evaluation process.

[0012] Furthermore, it also includes a pressure reducing valve, which is connected to the mass flow controller through a pipeline and is used to control the pressure of the hydrogen flowing into the mass flow controller.

[0013] Furthermore, a first gas valve is provided between the pressure transmitter and the solid-state hydrogen storage material tablet pressing device; and a second gas valve is provided between the solid-state hydrogen storage material tablet pressing device and the exhaust pipe.

[0014] In a third aspect, the present invention provides a method for using the hydrogen permeability testing system described above, comprising the following steps: S1. Take out the solid hydrogen storage material tabletting device and press the tablet inside the mold sleeve; S2. Obtaining the thickness of the tablet; S3. Reinstall the solid hydrogen storage material tableting device; S4. After determining the temperature of the tablet, continuously delivering hydrogen to the interior of the mold sleeve and allowing the hydrogen to flow from the first air cavity to the second air cavity through the tablet; S5. Obtaining the volume flow rate of hydrogen passing through the tablet per unit time by the mass flow controller; S6. Obtaining the air pressure of the first air cavity when the air pressure is stable through the pressure transmitter and recording it as the first air pressure; S7. Obtaining ambient atmospheric pressure; S8. Calculating the hydrogen pressure difference at both ends of the pressing sheet according to the first gas pressure and the ambient atmospheric pressure; S9. Calculate the hydrogen permeability of the pressed tablet according to the thickness of the pressed tablet, the volume flow rate of hydrogen passing through the pressed tablet per unit time, and the hydrogen pressure difference.

[0015] The hydrogen permeability of the tablet can be directly calculated by reading the relevant parameters through the hydrogen permeability test system. The test process is simple and easy to operate, which helps users quickly determine the performance of the tablet.

[0016] Furthermore, the specific steps in step S1 include: S11. The mold bottom is plugged and fixed to one of the two opposite ends of the mold sleeve; S12. Injecting solid hydrogen storage material into the mold sleeve; S13. The pressure rod is fixedly connected to the other end of the mold sleeve at both ends; S14. Applying pressure to the pressing rod to press the solid hydrogen storage material into the pressed tablet.

[0017] Furthermore, the specific steps in step S2 include: 21. Obtain the maximum depth of the pressure rod in the mold sleeve; 22. Obtaining the pressing depth of the pressing rod in the die sleeve when pressing the pressed tablet; 23. Calculate the thickness of the pressed sheet according to the maximum depth and the pressing depth.

[0018] Furthermore, the specific steps in step S3 include: S31. Remove the mold bottom and the pressure rod; S32. Installing the first air guide assembly at one of the two opposite ends of the mold sleeve, and installing the second air guide assembly at the other end of the two opposite ends of the mold sleeve; S33. Connect the first air duct to the mass flow controller, and connect the second air duct to the exhaust pipe.

[0019] Furthermore, the specific steps in step S9 include: S91. Calculate the hydrogen permeability according to the following formula: ; in, is the hydrogen permeability, is the volume flow rate of hydrogen passing through the tablet per unit time, is the dynamic viscosity of hydrogen, is the thickness of the pressed sheet, is the hydrogen pressure difference, is the cross-sectional area of ​​the tablet.

[0020] From the above, it can be seen that the solid-state hydrogen storage material tablet pressing device provided by the present invention can not only be used to press solid-state hydrogen storage material tablets, but also can be directly used for hydrogen permeability testing by replacing parts after tableting, thereby meeting the needs of instant testing of the tablet performance, achieving the effect of facilitating user evaluation and improving evaluation efficiency.

[0021] Other features and advantages of the present invention will be described in the following description, and partly become apparent from the description, or be understood by implementing the embodiments of the present invention. The purpose and other advantages of the present invention can be realized and obtained by the structures particularly pointed out in the written description and the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 A schematic structural diagram of a solid hydrogen storage material tablet pressing device provided in an embodiment of the present invention after a mold bottom and pressing rods are installed at both ends of a mold sleeve.

[0023] Figure 2 A schematic structural diagram of a solid hydrogen storage material tablet pressing device provided in an embodiment of the present invention after installing a first air guide component and a second air guide component at both ends of a mold sleeve.

[0024] Figure 3 A schematic diagram of the structure of a hydrogen permeability testing system provided in an embodiment of the present invention.

[0025] Figure 4 A flow chart of a method of use provided by an embodiment of the present invention.

[0026] Description of labels: 100. Solid-state hydrogen storage material tablet pressing device; 110. Press rod; 120. Mold sleeve; 121. Mounting hole; 130. Mold bottom; 140. Tablet pressing device; 150. First air cavity; 160. Second air cavity; 171. First air guide tube; 172. First nut; 173. First copper gasket; 181. Second air guide tube; 182. Second nut; 183. Second copper gasket; 200. Mass flow controller; 300. Pressure transmitter; 400. Exhaust pipe; 500. Pressure reducing valve; 600. First air valve; 700. Second air valve. DETAILED DESCRIPTION

[0027] The embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0028] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0029] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or mutual communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0030] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0031] The disclosure below provides many different embodiments or examples to realize different structures of the present invention. In order to simplify the disclosure of the present invention, the parts and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the present invention. In addition, the present invention can repeat reference numbers and / or reference letters in different examples, and this repetition is for the purpose of simplicity and clarity, which itself does not indicate the relationship between the various embodiments and / or settings discussed. In addition, the present invention provides various specific examples of processes and materials, but those of ordinary skill in the art can be aware of the application of other processes and / or the use of other materials.

[0032] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. The components of the embodiments of the present invention generally 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 invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely represents the selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative work belong to the scope of protection of the present invention.

[0033] It should be noted that similar numbers and letters represent similar items in the following figures, so once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined. At the same time, in the description of the present invention, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0034] Reference Figure 1 and attached Figure 2 The present invention provides a solid hydrogen storage material tablet pressing device, comprising a pressing rod 110, a die sleeve 120 and a die bottom 130. The pressing rod 110 and the die bottom 130 are detachably plugged at opposite ends of the die sleeve 120, respectively. The pressing rod 110 can abut against the die bottom 130 inside the die sleeve 120, and the pressing rod 110 and the die bottom 130 cooperate to press the solid hydrogen storage material in the die sleeve 120 to press out a tablet 140 inside the die sleeve 120. The pressing sheet 140 can separate the interior of the mold sleeve 120 into a first air cavity 150 and a second air cavity 160 that are independent of each other. The end of the mold sleeve 120 near the first air cavity 150 can be installed with a detachable first air guide component, and the first air guide component includes a first air guide tube 171, and the first air guide tube 171 can be sealed and connected to the first air cavity 150; the end of the mold sleeve 120 near the second air cavity 160 can be installed with a detachable second air guide component, and the second air guide component includes a second air guide tube 181, and the second air guide tube 181 can be sealed and connected to the second air cavity 160.

[0035] In this embodiment, in actual application, after the user installs the mold bottom 130 on the mold sleeve 120, pours the solid hydrogen storage material (the solid hydrogen storage material is a solid powder mixture, containing, for example, additives and metal hydride materials of different types and contents) into the mold sleeve 120, and then inserts the pressure rod 110 into the mold sleeve 120 to apply pressure to the solid hydrogen storage material, and finally presses the solid hydrogen storage material into a pressed tablet 140.

[0036] After removing the mold bottom 130 and the pressure rod 110, the formed pressing piece 140 still remains inside the mold sleeve 120 and separates the first air cavity 150 and the second air cavity 160. At this time, after installing the first air guide component and the second air guide component to both ends of the mold sleeve 120, the mold sleeve 120 can be directly connected to the test equipment to test the hydrogen permeability. This process does not require taking out the pressing piece in the mold sleeve 120, simplifies the operation steps, facilitates users to test and effectively improves the test efficiency, and can also effectively reduce the risk of the pressing piece being damaged during the transfer process after being taken out.

[0037] The solid-state hydrogen storage material tablet pressing device of this embodiment is particularly suitable for experimental scenarios. For example, if a user tests and finds that the performance of the solid-state hydrogen storage material of the previous assembly is poor, after removing the pressing tablet 140 in the mold sleeve 120, the same operation can be repeated to immediately press out the next assembly of solid-state hydrogen storage materials and quickly conduct a hydrogen permeability test. This is beneficial for users to test the performance of multiple different assemblies of solid-state hydrogen storage materials in a short period of time, greatly shortening the experimental cycle.

[0038] In some embodiments, the mold sleeve 120 is provided with a heating device (not shown), which is used to heat the pressing sheet 140. The heating device is, for example, a heating belt coated on the outside of the mold sleeve 120. The user can control the temperature of the solid hydrogen storage material in the mold sleeve 120 through the heating device to meet different tableting requirements and testing requirements. For example, for unactivated hydrogen storage alloys (such as AB5, AB2 and BCC alloys), the temperature of the hydrogen storage alloy is controlled by the heating device to be lower than the activation temperature during testing; for another example, for fully or partially hydrogenated lightweight hydrogen storage materials (such as magnesium-based hydrogen storage materials), the temperature of the lightweight hydrogen storage material is controlled by the heating device to be lower than the initial hydrogen release temperature during testing.

[0039] In certain embodiments, referring to Figure 1 A mounting hole 121 is provided on the outer side of the mold sleeve 120, and a temperature measuring device (not shown) is installed in the mounting hole 121. The temperature measuring device is used to measure the temperature of the pressing sheet 140. The temperature measuring device is, for example, a thermocouple. The user can more accurately control the temperature of the solid hydrogen storage material in the mold sleeve 120 through the temperature measuring device, thereby improving the accuracy of subsequent tests and the reliability of test results.

[0040] In certain embodiments, referring to Figure 2 The first air guide assembly further includes a first nut 172 and a first copper washer 173, the first nut 172 can be threadedly connected to the mold sleeve 120, and the first copper washer 173 can be crimped between the first nut 172 and the mold sleeve 120; The second air guide component also includes a second nut 182 and a second copper washer 183 . The second nut 182 can be threadedly connected to the mold sleeve 120 , and the second copper washer 183 can be crimped between the second nut 182 and the mold sleeve 120 .

[0041] In the present embodiment, the first air guide component and the second air guide component are installed on the mold sleeve 120 in a threaded connection manner, which is beneficial to ensure the air tightness of the first air cavity 150 and the second air cavity 160. The use of the first and second copper gaskets 173 and 183 that are resistant to temperature and pressure can further improve the air tightness of the first air cavity 150 and the second air cavity 160, which is beneficial to improving the accuracy of subsequent tests and the reliability of test results.

[0042] Reference Figure 3 The present invention provides a hydrogen permeability test system, comprising the solid hydrogen storage material tablet pressing device 100, the mass flow controller 200, the pressure transmitter 300 and the exhaust pipe 400 in the above embodiment, the mass flow controller 200, the solid hydrogen storage material tablet pressing device 100 and the exhaust pipe 400 are sequentially connected through a pipeline; the mass flow controller 200 is used to control the instantaneous flow rate of the outflowing hydrogen; The first air guide pipe 171 is connected to the mass flow controller 200; the second air guide pipe 181 is connected to one end of the exhaust pipe 400, and the other end of the exhaust pipe 400 is connected to the outside; The pressure transmitter 300 is connected to the pipeline between the mass flow controller 200 and the solid hydrogen storage material tablet pressing device 100 ; the pressure transmitter 300 is used to measure the air pressure of the first air cavity 150 .

[0043] In this embodiment, in actual application, the solid-state hydrogen storage material tabletting device is taken out separately as a part of the entire hydrogen permeability test system and made into a tablet 140 in the mold sleeve 120. Then, after replacing the first gas guide component and the second gas guide component, it is reinstalled into the hydrogen permeability test system to directly perform a hydrogen permeability test on the tablet 140. The user only needs to connect the first gas guide pipe 171 to the mass flow controller 200 and the second gas guide pipe 181 to the exhaust pipe 400 to complete the deployment of the entire hydrogen permeability test system. The installation process is convenient and there is no need to perform the step of taking out the tablet 140 from the mold sleeve 120, which simplifies the test steps and improves the test efficiency. At the same time, it also reduces the risk of damage to the tablet during the transfer process after it is taken out, reducing many inconveniences in the user evaluation process.

[0044] In certain embodiments, referring to Figure 3 The hydrogen permeability test system also includes a pressure reducing valve 500, which is connected to the mass flow controller 200 through a pipeline and is used to control the pressure of the hydrogen flowing into the mass flow controller 200. The setting of the pressure reducing valve 500 can prevent the pressure from exceeding the maximum pressure of the mass flow controller 200, which is beneficial to protecting the entire test system and ensuring the safe and stable operation of the system.

[0045] In certain embodiments, referring to Figure 3 A first gas valve 600 is provided between the pressure transmitter 300 and the solid hydrogen storage material tablet pressing device 100 ; a second gas valve 700 is provided between the solid hydrogen storage material tablet pressing device 100 and the exhaust pipe 400 .

[0046] In this embodiment, in actual application, after hydrogen is introduced into the mass flow controller 200, the first gas valve 600 and the second gas valve 700 are opened in sequence, so that the hydrogen is stably introduced into the mold sleeve 120 and penetrates from the first gas cavity 150 through the pressing sheet 140 into the second gas cavity 160, and then the gas pressure of the first gas cavity 150 after the pressure is stabilized can be obtained through the pressure transmitter 300. At the same time, since the second gas cavity 160 is directly connected to the atmosphere through the second gas duct 181 and the exhaust pipe 400, the gas pressure difference at both ends of the pressing sheet 140 can be calculated based on the gas pressure of the first gas cavity 150 and the ambient atmospheric pressure.

[0047] Reference Figure 4 The present invention provides a method for using the hydrogen permeability test system in the above embodiment, comprising the following steps: S1. Take out the solid hydrogen storage material tablet pressing device and press the tablet inside the mold sleeve; S2. Obtain the thickness of the tablet; S3. Reinstall the solid hydrogen storage material tableting device; S4. After determining the temperature of the tablet, hydrogen is continuously delivered to the interior of the mold sleeve so that the hydrogen flows from the first air cavity to the second air cavity through the tablet; S5. Obtaining the volume flow rate of hydrogen passing through the tablet per unit time through a mass flow controller; S6. Obtain the air pressure of the first air cavity when the air pressure is stable through the pressure transmitter and record it as the first air pressure; S7. Obtaining ambient atmospheric pressure; S8. Calculate the hydrogen pressure difference at both ends of the tablet according to the first gas pressure and the ambient atmospheric pressure; S9. Calculate the hydrogen permeability of the tablet according to the thickness of the tablet, the volume flow rate of hydrogen passing through the tablet per unit time, and the hydrogen pressure difference.

[0048] In this embodiment, in actual application, the hydrogen permeability of the tablet can be directly calculated by reading relevant parameters through the hydrogen permeability test system. The test process is simple and easy to operate, which is conducive to users to quickly determine the performance of the tablet.

[0049] In some embodiments, the specific steps in step S1 include: S11. The mold bottom is plugged and fixed to one of the two opposite ends of the mold sleeve; S12. Injecting solid hydrogen storage material into the mold sleeve; S13. The pressure rod is inserted and fixed at the other end of the opposite ends of the mold sleeve; S14. Apply pressure to the pressing rod to press the solid hydrogen storage material into a pressed pellet.

[0050] In this embodiment, the mold bottom, the mold sleeve and the pressing rod constitute a tablet press to enable tablets to be pressed and formed. The structure is simple and the operation is convenient, so users can complete tableting more easily.

[0051] In some embodiments, the specific steps in step S2 include: S21 obtains the maximum depth of the pressure rod in the mold sleeve; S22. Get the depth of penetration of the pressure rod into the mold sleeve when pressing the tablet; S23. Calculate the thickness of the pressed tablet based on the maximum depth and the indentation depth.

[0052] In this embodiment, the thickness of the tablet can be quickly calculated based on the pressing depth of the pressure rod. In the actual tableting process, the thickness can be calculated when the tablet is made. Compared with the method of taking the tablet out of the mold sleeve and then using tools to measure, the measurement speed of this embodiment is faster, which is beneficial to improving test efficiency and greatly facilitates users to evaluate tableting performance.

[0053] In some embodiments, the specific steps in step S3 include: S31. Remove the mold bottom and pressure rod; S32. Install a first air guide assembly at one end of the mold sleeve at both ends, and install a second air guide assembly at the other end of the mold sleeve at both ends; S33. Connect the first air duct to the mass flow controller, and connect the second air duct to the exhaust pipe.

[0054] In this embodiment, the mold sleeve combines the two functions of film production and testing by replacing parts, so that users can produce and test immediately, which greatly improves the evaluation efficiency and shortens the evaluation cycle.

[0055] In some embodiments, the specific steps in step S9 include: S91. Calculate the hydrogen permeability according to the following formula: ; in, is the hydrogen permeability, is the volume flow rate of hydrogen passing through the tablet per unit time, is the dynamic viscosity of hydrogen, is the thickness of the pressed sheet, is the hydrogen pressure difference, is the cross-sectional area of ​​the tablet.

[0056] In this embodiment, a test environment with a standard atmospheric pressure (101.325 kPa) is used as an example. It can be obtained according to the following calculation formula: ; in, These are all preset coefficients, for example , , , , is the hydrogen temperature.

[0057] 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.

[0058] Descriptions with reference to the terms "one embodiment", "certain embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" are intended to mean that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0059] The above description is only an embodiment of the present invention and is not intended to limit the protection scope of the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A solid hydrogen storage material tablet pressing device, characterized in that: The mold sleeve (120) comprises a pressure rod (110), a mold sleeve (120) and a mold bottom (130), wherein the pressure rod (110) and the mold bottom (130) are both detachably plugged into opposite ends of the mold sleeve (120), respectively, and the pressure rod (110) can abut against the mold bottom (130) inside the mold sleeve (120), and the pressure rod (110) and the mold bottom (130) cooperate to pressurize the solid hydrogen storage material in the mold sleeve (120) to press out a pressed tablet (140) inside the mold sleeve (120); The pressing sheet (140) is capable of separating the interior of the mold sleeve (120) into a first air cavity (150) and a second air cavity (160) that are independent of each other; a detachable first air guide component can be installed on one end of the mold sleeve (120) close to the first air cavity (150); the first air guide component comprises a first air guide tube (171); and the first air guide tube (171) can be sealed and connected to the first air cavity (150); and a detachable second air guide component can be installed on one end of the mold sleeve (120) close to the second air cavity (160); the second air guide component comprises a second air guide tube (181); and the second air guide tube (181) can be sealed and connected to the second air cavity (160).

2. The solid-state hydrogen storage material tablet pressing device according to claim 1, characterized in that: The first air guide component further comprises a first nut (172) and a first copper washer (173); the first nut (172) can be threadedly connected to the mold sleeve (120), and the first copper washer (173) can be crimped between the first nut (172) and the mold sleeve (120); The second air guide component further comprises a second nut (182) and a second copper washer (183); the second nut (182) can be threadedly connected to the mold sleeve (120), and the second copper washer (183) can be crimped between the second nut (182) and the mold sleeve (120).

3. A hydrogen permeability testing system, characterized in that: The invention comprises a solid hydrogen storage material tablet pressing device (100) as claimed in any one of claims 1 to 2, a mass flow controller (200), a pressure transmitter (300) and an exhaust pipe (400), wherein the mass flow controller (200), the solid hydrogen storage material tablet pressing device (100) and the exhaust pipe (400) are sequentially connected through a pipeline; the mass flow controller (200) is used to control the instantaneous flow rate of the outflowing hydrogen; The first air guide pipe (171) is in communication with the mass flow controller (200); the second air guide pipe (181) is in communication with one end of the exhaust pipe (400), and the other end of the exhaust pipe (400) is in communication with the outside; The pressure transmitter (300) is connected to a pipeline between the mass flow controller (200) and the solid hydrogen storage material tablet pressing device (100); the pressure transmitter (300) is used to measure the air pressure of the first air cavity (150).

4. The hydrogen permeability testing system according to claim 3, characterized in that: It also includes a pressure reducing valve (500), which is connected to the mass flow controller (200) through a pipeline and is used to control the gas pressure of the hydrogen flowing into the mass flow controller (200).

5. The hydrogen permeability testing system according to claim 3, characterized in that: A first gas valve (600) is provided between the pressure transmitter (300) and the solid hydrogen storage material tablet pressing device (100); and a second gas valve (700) is provided between the solid hydrogen storage material tablet pressing device (100) and the exhaust pipe (400).

6. A method for using the hydrogen permeability test system according to any one of claims 3 to 5, characterized in that: The following steps are involved: S1. Take out the solid hydrogen storage material tabletting device and press the tablet inside the mold sleeve; S2. Obtaining the thickness of the tablet; S3. Reinstall the solid hydrogen storage material tableting device; S4. After determining the temperature of the tablet, continuously delivering hydrogen to the interior of the mold sleeve and allowing the hydrogen to flow from the first air cavity to the second air cavity through the tablet; S5. Obtaining the volume flow rate of hydrogen passing through the tablet per unit time by the mass flow controller; S6. Obtaining the air pressure of the first air cavity when the air pressure is stable through the pressure transmitter and recording it as the first air pressure; S7. Obtaining ambient atmospheric pressure; S8. Calculating the hydrogen pressure difference at both ends of the pressing sheet according to the first gas pressure and the ambient atmospheric pressure; S9. Calculate the hydrogen permeability of the pressed tablet according to the thickness of the pressed tablet, the volume flow rate of hydrogen passing through the pressed tablet per unit time, and the hydrogen pressure difference.

7. The method of use according to claim 6, characterized in that: The specific steps in step S1 include: S11. The mold bottom is plugged and fixed to one of the two opposite ends of the mold sleeve; S12. Injecting solid hydrogen storage material into the mold sleeve; S13. The pressure rod is fixedly connected to the other end of the mold sleeve at both ends; S14. Applying pressure to the pressing rod to press the solid hydrogen storage material into the pressed tablet.

8. The method of use according to claim 6, characterized in that: The specific steps in step S2 include: S21 obtains the maximum depth of the pressure rod in the mold sleeve; S22. Obtaining the depth of penetration of the pressure rod into the mold sleeve when the pressure rod is pressing the tablet; S23. Calculate the thickness of the pressed sheet according to the maximum depth and the pressing depth.

9. The method of use according to claim 6, characterized in that: The specific steps in step S3 include: S31. Remove the mold bottom and the pressure rod; S32. Installing the first air guide assembly at one of the two opposite ends of the mold sleeve, and installing the second air guide assembly at the other end of the two opposite ends of the mold sleeve; S33. Connect the first air duct to the mass flow controller, and connect the second air duct to the exhaust pipe.

10. The method of use according to claim 6, characterized in that: The specific steps in step S9 include: S91. Calculate the hydrogen permeability according to the following formula: ； in, is the hydrogen permeability, is the volume flow rate of hydrogen passing through the tablet per unit time, is the dynamic viscosity of hydrogen, is the thickness of the pressed sheet, is the hydrogen pressure difference, is the cross-sectional area of ​​the tablet.

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