Metal hydride hydrogen storage tank and circular hydrogen charging and discharging method thereof

Abstract

The invention relates to the technical field of hydrogen energy solid hydrogen storage, and discloses a metal hydride hydrogen storage tank and a circulating hydrogen charging and discharging method.The metal hydride hydrogen storage tank comprises a tank body, the top end of the tank body is communicated with a gas inlet pipe, and the bottom end of the gas inlet pipe extends into the tank body and is rotationally provided with a connecting pipe through a rotating connector; a plurality of circular heat dissipation fins are fixedly connected between the inner walls of the tank body, the bottom end of the connecting pipe penetrates through the heat dissipation fins to be rotationally connected with the bottom end of the tank body, and a plurality of air holes are formed in the surface of each heat dissipation fin; four telescopic rods are fixedly connected to the top wall of the interior of the tank body, the hydrogen storage tank drives the transmission assembly to drive the connecting pipe and the stirring plate to rotate through movement of the piston, metal hydride is prevented from caking, hydrogen is dispersed more evenly through inclined air outlet holes, and the hydrogen storage efficiency is improved; the circular heat dissipation fins are provided with air holes, so that heat dissipation is achieved, and circulation of hydrogen is not blocked.

Description

Technical Field

[0001] This invention relates to the field of solid-state hydrogen storage technology, specifically to a metal hydride hydrogen storage tank and its cyclic charging and discharging method. Background Technology

[0002] Hydrogen energy is a crucial clean and efficient energy source. The hydrogen energy industry chain includes hydrogen production, storage and transportation, and applications. Hydrogen storage is key to connecting the supply side (hydrogen production) with the demand side (hydrogen applications). Currently, the main hydrogen storage and transportation methods used in the market are: high-pressure gas tank storage, cryogenic liquid hydrogen storage tanks, and solid-state hydrogen storage. Solid-state hydrogen storage, compared to the other two methods, offers advantages such as higher hydrogen density per unit area and lower pressure safety, making it more likely to be widely adopted in the market in the future.

[0003] A metal hydride hydrogen storage tank, disclosed in publication number CN 220366276 U, belongs to the field of solid-state hydrogen storage technology. This storage tank includes a tank body, a hydrogen storage bed assembly, a heat-conducting layer, a filter head, and valves. Multiple hydrogen storage bed assemblies are sequentially filled within the tank. Each assembly is a sandwich-type layered structure, including hydrogen storage material and heat dissipation fins. The heat-conducting layer is positioned between the hydrogen storage bed assemblies. Both the heat-conducting layer and the heat dissipation fins are made of metal, enhancing heat transfer within the hydrogen storage bed. This invention's metal hydride hydrogen storage tank has a simple structure and is easy to manufacture. The employed hydrogen storage bed assembly structure effectively improves the heat transfer performance of the hydrogen storage bed, ensuring smooth hydrogen absorption / desorption. It also alleviates stress concentration caused by the expansion of the hydrogen storage material after hydrogen absorption, thus improving the service life and safety of the metal hydride hydrogen storage tank.

[0004] However, the aforementioned hydrogen storage tanks still have some shortcomings in use. The static heat conduction and hydrogen storage structure design can only passively transfer heat through fixed heat dissipation fins and heat conduction layers, which cannot solve the problem of decreased mass transfer efficiency caused by the agglomeration of hydrogen storage materials after long-term use. In addition, the flow and distribution structure of hydrogen in the tank has not been optimized, and hydrogen is prone to accumulate in local areas, making it difficult to uniformly contact all hydrogen storage materials. There is still considerable room for improvement in hydrogen storage efficiency and material utilization. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a metal hydride hydrogen storage tank and its cyclic charging and discharging method. This solves the problem that static heat conduction and hydrogen storage structure designs can only passively transfer heat through fixed heat dissipation fins and a heat-conducting layer, failing to address the issue of decreased mass transfer efficiency due to agglomeration of hydrogen storage materials after long-term use. Furthermore, these designs do not optimize the flow and distribution structure of hydrogen within the tank, leading to hydrogen accumulation in localized areas and difficulty in uniformly contacting all hydrogen storage materials, leaving significant room for improvement in hydrogen storage efficiency and material utilization.

[0006] The present invention provides the following technical solution: a metal hydride hydrogen storage tank, including a tank body, an air inlet pipe connected to the top of the tank body, the bottom end of the air inlet pipe extending into the interior of the tank body and rotatably connected to a connecting pipe via a rotary joint, multiple circular heat dissipation fins fixedly connected between the inner walls of the tank body, the bottom end of the connecting pipe passing through the multiple heat dissipation fins and rotatably connected to the bottom end of the tank body, and multiple vent holes being opened on the surface of each heat dissipation fin;

[0007] Four telescopic rods are fixedly connected to the inner top wall of the tank. Each telescopic rod is fitted with a spring. A piston is fixedly connected between the bottom ends of the four telescopic rods. A rotating rod is rotatably installed on the inner wall of the tank. A transmission assembly is provided between the rotating rod, the connecting pipe, and the piston. The piston can drive the connecting pipe to rotate through the transmission assembly.

[0008] Preferred technical solution one: The transmission assembly includes a gear, two racks, a first bevel gear, and a second bevel gear. The gear is fixedly sleeved on the surface of the rotating rod, the two racks are fixedly mounted on the upper surface of the piston, and both racks mesh with the gear. The first bevel gear is fixedly mounted on one end of the rotating rod, and the second bevel gear is fixedly mounted on the surface of the connecting pipe, with the first bevel gear meshing with the second bevel gear.

[0009] Preferred technical solution 2: Two rows of stirring plates are fixedly connected to the surface of the connecting pipe, and each stirring plate is located above the corresponding heat dissipation fin.

[0010] Preferred technical solution 3: The surface of the connecting pipe is provided with multiple air outlets, and each air outlet is inclined.

[0011] Preferred technical solution four: The top of the tank is connected to an air outlet pipe, the bottom end of the air outlet pipe extends to the bottom of the piston, and the piston can slide on the air outlet pipe.

[0012] Preferred technical solution five: The piston is made of stainless steel, and its diameter matches the inner diameter of the tank. A 0.5mm gap is reserved between the piston and the inner wall of the tank.

[0013] Preferred technical solution six: Valves are provided on both the air inlet pipe and the air outlet pipe.

[0014] Preferred technical solution seven: the connecting pipe is made of titanium alloy, the stirring plate is made of polytetrafluoroethylene, and the stroke of the rack matches the stroke of the piston.

[0015] A method for cyclically charging and discharging hydrogen from a metal hydride hydrogen storage tank includes the following steps:

[0016] S1. Hydrogen storage operation:

[0017] S11. Open the valve on the intake pipe to allow hydrogen to be introduced through the intake pipe and enter the connecting pipe through the rotary joint at the bottom of the intake pipe;

[0018] S12. Hydrogen gas is evenly dispersed into the hydrogen storage space inside the tank through multiple outlet holes that are inclined on the surface of the connecting pipe;

[0019] S13. As the amount of hydrogen in the tank increases, the pressure inside the tank rises and pushes the piston upward. The piston drives the two racks fixed on its surface to move upward synchronously. The racks mesh with the gears fixed on the surface of the rotating rod, driving the gears and the rotating rod to rotate. The first bevel gear at one end of the rotating rod rotates synchronously. The first bevel gear meshes with the second bevel gear on the surface of the connecting pipe, driving the connecting pipe to rotate.

[0020] S14. When the connecting pipe rotates, the two rows of stirring plates fixed on its surface rotate synchronously to stir the metal hydride in the tank; at the same time, the circular heat dissipation fins on the inner wall of the tank dissipate the heat generated during the hydrogen absorption process of the metal hydride through the vent holes on its surface without obstructing the flow of hydrogen.

[0021] S2. Hydrogen release operation:

[0022] S21. Open the valve on the air outlet pipe;

[0023] S22. After the hydrogen gas in the tank is discharged, the pressure decreases, and the spring sleeved on the surface of the telescopic rod generates a restoring force, pushing the piston to move downward. The downward movement of the piston drives the rack to drive the gear, rotating rod, first bevel gear and second bevel gear to rotate together, so that the connecting pipe and stirring plate continue to rotate.

[0024] S23. The rotation of the stirring plate promotes the release of hydrogen gas from the metal hydride, and the released hydrogen gas is discharged from the tank through the outlet pipe extending below the piston.

[0025] Compared with the prior art, the present invention provides a metal hydride hydrogen storage tank and its circulating hydrogen filling and discharging method, which has the following beneficial effects: When performing hydrogen storage operation, the valve on the inlet pipe is first opened, and hydrogen gas enters the connecting pipe rotatably connected to it via a rotary joint. Then, it is evenly dispersed into the hydrogen storage space inside the tank through multiple inclined outlet holes on the surface of the connecting pipe. As the amount of hydrogen in the tank increases and the pressure rises, the pressure pushes the piston upward, simultaneously causing two racks fixed above it to move upward synchronously. Since the racks mesh with gears fixedly sleeved on the surface of the rotating rod, the movement of the racks drives the gears to rotate, thereby driving the rotating rod and the first bevel gear fixed at one end to rotate. Because the first bevel gear meshes with the second bevel gear fixedly installed on the surface of the connecting pipe, the connecting pipe is ultimately rotated. When the connecting pipe rotates, the two rows of stirring plates fixedly connected to its surface rotate accordingly. The piston stirs the metal hydride inside the tank to prevent it from clumping. Simultaneously, multiple circular heat dissipation fins fixedly connected to the inner wall of the tank, through multiple vent holes on the surface, dissipate the heat generated during hydrogen absorption by the metal hydride without obstructing hydrogen flow. When hydrogen release is needed, the valve on the outlet pipe is opened, reducing the pressure inside the tank. Under the restoring force of the spring, the piston moves downward. The piston's downward movement, through a transmission assembly consisting of a rack, gears, rotating rod, and first and second bevel gears, drives the connecting pipe and stirring plate to rotate again, promoting the release of hydrogen from the metal hydride. The released hydrogen is discharged through the outlet pipe extending below the piston, completing the hydrogen supply. This hydrogen storage tank uses the piston's movement to drive the transmission assembly, rotating the connecting pipe and stirring plate, preventing metal hydride clumping. The inclined outlet holes also allow for more even hydrogen dispersion, improving hydrogen storage efficiency. The circular heat dissipation fins with vent holes dissipate heat without obstructing hydrogen flow. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the structure of the present invention;

[0027] Figure 2 This is a cross-sectional view of the internal structure of the tank of the present invention;

[0028] Figure 3 This is a cross-sectional exploded view of the internal structure of the tank body of the present invention;

[0029] Figure 4 For the present invention Figure 3 Enlarged view of the structure of A in the middle;

[0030] Figure 5 This is a schematic diagram of the intake pipe and connecting pipe structure of the present invention;

[0031] Figure 6 This is a cross-sectional view of the internal structure of the connecting pipe of the present invention.

[0032] In the diagram: 1. Tank body; 2. Air inlet pipe; 3. Connecting pipe; 4. Heat dissipation fins; 5. Telescopic rod; 6. Piston; 7. Rotating rod; 8. Gear; 9. Rack; 10. First bevel gear; 11. Second bevel gear; 12. Stirring plate; 13. Air outlet; 14. Air outlet pipe; 15. Spring; 16. Valve; 17. Vent hole. Detailed Implementation

[0033] Please see Figure 1-6 ,

[0034] Example 1: A metal hydride hydrogen storage tank and its circulating hydrogen charging and discharging method, comprising a tank body 1, an air inlet pipe 2 connected to the top of the tank body 1, the bottom end of the air inlet pipe 2 extending into the interior of the tank body 1 and rotatably connected to a connecting pipe 3 via a rotary joint, multiple circular heat dissipation fins 4 fixedly connected between the inner walls of the tank body 1, the bottom end of the connecting pipe 3 passing through multiple heat dissipation fins 4 and rotatably connected to the bottom end of the tank body 1, and multiple vent holes 17 being opened on the surface of each heat dissipation fin 4;

[0035] The vent holes 17 of the circular heat dissipation fins 4 are evenly distributed, and hydrogen can flow between different circular heat dissipation fins 4 through the vent holes 17, while simultaneously transferring heat to the outside of the tank 1.

[0036] Four telescopic rods 5 are fixedly connected to the inner top wall of the tank body 1. Each telescopic rod 5 is fitted with a spring 15. A piston 6 is fixedly connected between the bottom ends of the four telescopic rods 5. A rotating rod 7 is rotatably installed on the inner wall of the tank body 1. A transmission assembly is provided between the rotating rod 7, the connecting pipe 3, and the piston 6. The piston 6 can drive the connecting pipe 3 to rotate through the transmission assembly.

[0037] Example 2: The difference between this example and Example 1 is that the transmission assembly includes a gear 8, two racks 9, a first bevel gear 10, and a second bevel gear 11. The gear 8 is fixedly sleeved on the surface of the rotating rod 7. The two racks 9 are fixedly mounted on the upper surface of the piston 6, and both racks 9 mesh with the gear 8. The first bevel gear 10 is fixedly mounted on one end of the rotating rod 7, and the second bevel gear 11 is fixedly mounted on the surface of the connecting pipe 3, and the first bevel gear 10 and the second bevel gear 11 mesh with each other.

[0038] Example 3: The difference between this example and Example 1 is that two rows of stirring plates 12 are fixedly connected to the surface of the connecting pipe 3, and each stirring plate 12 is located above the corresponding heat dissipation fin 4.

[0039] The stirring plates 12 are all located above the corresponding circular heat dissipation fins 4. When the stirring plates 12 rotate, they can cover the metal hydride area above the circular heat dissipation fins 4, preventing the metal hydride from clumping together.

[0040] Example 4: The difference between this example and Example 1 is that the surface of the connecting pipe 3 is provided with multiple air outlets 13, and each air outlet 13 is inclined.

[0041] The connecting pipe 3 is made of titanium alloy, and the inclined vent 13 disperses the hydrogen gas towards the inner wall of the tank 1 and the metal hydride accumulation area, thereby improving the uniformity of contact between hydrogen gas and metal hydrides.

[0042] Example 5: The difference between this example and Example 1 is that the top of the tank 1 is connected to an air outlet pipe 14, the bottom of the air outlet pipe 14 extends to the bottom of the piston 6, and the piston 6 can slide on the air outlet pipe 14.

[0043] Example 6: The difference between this example and Example 1 is that the piston 6 is made of stainless steel, its diameter matches the inner diameter of the tank, and a 0.5mm gap is reserved between the piston 6 and the inner wall of the tank 1.

[0044] Piston 6 is made of stainless steel, and a 0.5mm gap is reserved between piston 6 and the inner wall of tank 1. When piston 6 moves up and down, it slides along the air outlet pipe 14 to avoid jamming with the inner wall of tank 1.

[0045] Example 7: The difference between this example and Example 1 is that valves 16 are provided on both the air inlet pipe 2 and the air outlet pipe 14.

[0046] Example 8: The difference between this example and Example 1 is that the connecting pipe 3 is made of titanium alloy, the stirring plate 12 is made of polytetrafluoroethylene, and the stroke of the rack 9 matches the stroke of the piston 6.

[0047] The stroke of rack 9 matches the stroke of piston 6, ensuring that rack 9 can fully drive gear 8 to rotate when it moves, thereby driving connecting pipe 3 to rotate at a preset angle.

[0048] A method for cyclically charging and discharging hydrogen from a metal hydride hydrogen storage tank includes the following steps:

[0049] S1. Hydrogen storage operation:

[0050] S11. Open valve 16 on inlet pipe 2 to allow hydrogen to enter through inlet pipe 2 and into connecting pipe 3 through rotary joint at the bottom of inlet pipe 2; Open inlet valve: Open valve on inlet pipe at top of tank to provide a channel for hydrogen to enter tank.

[0051] S12. Hydrogen gas is evenly dispersed into the hydrogen storage space inside the tank 1 through multiple outlet holes 13 that are inclined on the surface of the connecting pipe 3.

[0052] S13. As the amount of hydrogen in the tank increases, the pressure inside the tank rises and pushes the piston 6 upward. The piston 6 drives the two racks 9 fixed on its surface to move upward synchronously. The racks 9 mesh with the gears 8 fixed on the surface of the rotating rod 7, driving the gears 8 and the rotating rod 7 to rotate. The first bevel gear 10 at one end of the rotating rod 7 rotates synchronously. The first bevel gear 10 meshes with the second bevel gear 11 on the surface of the connecting pipe 3, driving the connecting pipe 3 to rotate.

[0053] Piston-driven transmission assembly: As the amount of hydrogen in the tank increases, the pressure inside the tank gradually rises, pushing the piston upwards. Simultaneously, the piston moves upwards, causing two racks fixed to its surface to move upwards in sync. Since the racks mesh with gears fixed to the surface of the rotating rod, the movement of the racks drives the gears to rotate, which in turn drives the rotating rod and the first bevel gear at one end of the rotating rod to rotate. Furthermore, because the first bevel gear meshes with the second bevel gear on the surface of the connecting pipe, the connecting pipe is ultimately rotated.

[0054] S14. When the connecting pipe 3 rotates, the two rows of stirring plates 12 fixed on its surface rotate synchronously to stir the metal hydride in the tank; at the same time, the circular heat dissipation fins 4 on the inner wall of the tank 1 dissipate the heat generated during the hydrogen absorption process of the metal hydride through the vent holes 17 opened on its surface without obstructing the flow of hydrogen.

[0055] Hydrogen introduction and dispersion: Hydrogen enters through the inlet pipe, then enters the connecting pipe through the rotary joint at the bottom of the inlet pipe, and then is evenly dispersed into the hydrogen storage space inside the tank through multiple outlet holes set at an angle on the surface of the connecting pipe, ensuring that the hydrogen can come into more extensive contact with the metal hydride.

[0056] Stirring and anti-caking, and heat dissipation: When the connecting pipe rotates, the two rows of stirring plates fixed on its surface rotate accordingly, stirring the metal hydride inside the tank. This effectively prevents the metal hydride from clumping after long-term use, ensuring mass transfer efficiency. Simultaneously, multiple circular heat dissipation fins fixed to the inner wall of the tank, through multiple vent holes on their surface, dissipate the heat generated during hydrogen absorption by the metal hydride without obstructing hydrogen flow, thus achieving heat dissipation and ensuring stable hydrogen storage.

[0057] S2. Hydrogen release operation:

[0058] S21. Open valve 16 on the air outlet pipe 14;

[0059] Open the vent valve: Open the valve on the vent pipe at the top of the tank to provide a channel for hydrogen to be discharged.

[0060] Hydrogen extraction: The rotation of the stirring plate promotes the release of hydrogen from the metal hydride. The released hydrogen is extracted from the tank through the outlet pipe extending below the piston, completing the hydrogen release and supplying hydrogen for subsequent hydrogen energy applications.

[0061] S22. After the hydrogen gas in the tank is discharged, the pressure decreases, and the spring 15 sleeved on the surface of the telescopic rod 5 generates a restoring force, pushing the piston 6 to move downward. The downward movement of the piston 6 drives the rack 9 to drive the gear 8, the rotating rod 7, the first bevel gear 10 and the second bevel gear 11 to work together, so that the connecting pipe 3 and the stirring plate 12 continue to rotate.

[0062] S23. The rotation of the stirring plate 12 promotes the release of hydrogen gas from the metal hydride, and the released hydrogen gas is discharged from the tank 1 through the outlet pipe 14 extending below the piston 6.

[0063] Piston reset drive transmission assembly: After the hydrogen gas is discharged from the tank, the pressure inside the tank decreases. Under the reset force of the spring on the surface of the telescopic rod, the piston moves downward. When the piston moves downward, it drives the rack to move again. Through the transmission assembly composed of the rack, gears, rotating rod, first bevel gear and second bevel gear, the connecting pipe and stirring plate are driven to rotate.

[0064] In summary, the hydrogen storage tank and its circulating hydrogen filling and discharging method for this metal hydride storage tank, during hydrogen storage operation, firstly, the valve 16 on the inlet pipe 2 is opened, and hydrogen gas enters the connecting pipe 3, which is rotatably connected to the inlet pipe 2 via a rotary joint. Then, it is evenly dispersed into the hydrogen storage space inside the tank 1 through multiple inclined outlet holes 13 on the surface of the connecting pipe 3. As the amount of hydrogen in the tank increases and the pressure rises, the pressure pushes the piston 6 upward, simultaneously causing the two racks 9 fixed above it to move upward synchronously. Since the racks 9 mesh with the gears 8 fixedly sleeved on the surface of the rotating rod 7, the movement of the racks 9 drives the gears 8 to rotate, thereby causing the rotating rod 7 and the first bevel gear 10 fixed at one end to rotate. Since the first bevel gear 10 meshes with the second bevel gear 11 fixedly installed on the surface of the connecting pipe 3, the connecting pipe 3 is finally rotated. When the connecting pipe 3 rotates, the two rows of stirring plates 12 fixedly connected to its surface rotate accordingly, stirring the metal hydride in the tank and preventing... To prevent caking, multiple circular heat dissipation fins 4, fixedly connected between the inner walls of the tank 1, dissipate the heat generated during the hydrogen absorption process of the metal hydride through multiple vent holes 17 on the surface, without obstructing the flow of hydrogen, thus achieving heat dissipation. When hydrogen release is required, the valve 16 on the outlet pipe 14 is opened, reducing the pressure inside the tank. Under the restoring force of the spring 15, the piston 6 moves downward. The downward movement of the piston 6 drives the connecting pipe 3 and the stirring plate 12 to rotate again through the transmission assembly composed of rack 9, gear 8, rotating rod 7, first bevel gear 10 and second bevel gear 11, promoting the release of hydrogen from the metal hydride. The released hydrogen is discharged through the outlet pipe 14 extending below the piston 6, completing the hydrogen supply. This hydrogen storage tank uses the movement of the piston 6 to drive the transmission assembly to rotate the connecting pipe 3 and the stirring plate 12, preventing the metal hydride from caking. It also uses the inclined outlet holes 13 to make the hydrogen more evenly dispersed, improving the hydrogen storage efficiency. The circular heat dissipation fins 4 with vent holes 17 dissipate heat without obstructing the flow of hydrogen.

Claims

1. A metal hydride hydrogen storage tank, comprising a tank body (1), characterized in that: The top of the tank (1) is connected to an air inlet pipe (2), the bottom end of the air inlet pipe (2) extends into the interior of the tank (1) and is rotatably connected to a connecting pipe (3) via a rotary joint. Multiple circular heat dissipation fins (4) are fixedly connected between the inner walls of the tank (1). The bottom end of the connecting pipe (3) passes through multiple heat dissipation fins (4) and is rotatably connected to the bottom end of the tank (1). Multiple vent holes (17) are opened on the surface of each heat dissipation fin (4). Four telescopic rods (5) are fixedly connected to the inner top wall of the tank (1). Each telescopic rod (5) is fitted with a spring (15). A piston (6) is fixedly connected between the bottom ends of the four telescopic rods (5). A rotating rod (7) is rotatably installed on the inner wall of the tank (1). A transmission assembly is provided between the rotating rod (7), the connecting pipe (3), and the piston (6). The piston (6) can drive the connecting pipe (3) to rotate through the transmission assembly.

2. The metal hydride hydrogen storage tank according to claim 1, characterized in that: The transmission assembly includes a gear (8), two racks (9), a first bevel gear (10), and a second bevel gear (11). The gear (8) is fixedly sleeved on the surface of the rotating rod (7), the two racks (9) are fixedly mounted on the upper surface of the piston (6), and both racks (9) mesh with the gear (8). The first bevel gear (10) is fixedly mounted on one end of the rotating rod (7), and the second bevel gear (11) is fixedly mounted on the surface of the connecting pipe (3), and the first bevel gear (10) meshes with the second bevel gear (11).

3. A metal hydride hydrogen storage tank according to claim 1, characterized in that: Two rows of stirring plates (12) are fixedly connected to the surface of the connecting pipe (3), and each stirring plate (12) is located above the corresponding heat dissipation fin (4).

4. A metal hydride hydrogen storage tank according to claim 1, characterized in that: The surface of the connecting pipe (3) is provided with a plurality of air outlets (13), and each air outlet (13) is inclined.

5. A metal hydride hydrogen storage tank according to claim 1, characterized in that: The top of the tank (1) is connected to an air outlet pipe (14), the bottom end of which extends to the bottom of the piston (6), and the piston (6) can slide on the air outlet pipe (14).

6. A metal hydride hydrogen storage tank according to claim 1, characterized in that: The piston (6) is made of stainless steel and its diameter matches the inner diameter of the tank. A 0.5mm gap is reserved between the piston (6) and the inner wall of the tank (1).

7. A metal hydride hydrogen storage tank according to claim 5, characterized in that: Both the air inlet pipe (2) and the air outlet pipe (14) are equipped with valves (16).

8. A metal hydride hydrogen storage tank according to claim 2, characterized in that: The connecting pipe (3) is made of titanium alloy, the stirring plate (12) is made of polytetrafluoroethylene, and the stroke of the rack (9) matches the stroke of the piston (6).

9. A method for cyclically charging and discharging hydrogen in a metal hydride hydrogen storage tank according to any one of claims 1-8, characterized in that, Includes the following steps: S1. Hydrogen storage operation: S11. Open the valve (16) on the inlet pipe (2) to allow hydrogen to be introduced through the inlet pipe (2) and enter the connecting pipe (3) through the rotary joint at the bottom of the inlet pipe (2). S12. Hydrogen gas is evenly dispersed into the hydrogen storage space inside the tank (1) through multiple outlet holes (13) inclined on the surface of the connecting pipe (3); S13. As the amount of hydrogen in the tank increases, the pressure inside the tank rises and pushes the piston (6) to move upward. The piston (6) drives the two racks (9) fixed on its surface to move upward synchronously. The racks (9) mesh with the gears (8) fixed on the surface of the rotating rod (7), driving the gears (8) and the rotating rod (7) to rotate. The first bevel gear (10) at one end of the rotating rod (7) rotates synchronously. The first bevel gear (10) meshes with the second bevel gear (11) on the surface of the connecting pipe (3), driving the connecting pipe (3) to rotate. S14. When the connecting pipe (3) rotates, the two rows of stirring plates (12) fixed on its surface rotate synchronously to stir the metal hydride in the tank; at the same time, the circular heat dissipation fins (4) on the inner wall of the tank (1) dissipate the heat generated during the hydrogen absorption process of the metal hydride through the vent holes (17) opened on its surface without hindering the flow of hydrogen. S2. Hydrogen release operation: S21. Open the valve (16) on the air outlet pipe (14). S22. After the hydrogen gas in the tank is discharged, the pressure decreases and the spring (15) sleeved on the surface of the telescopic rod (5) generates a restoring force, pushing the piston (6) to move downward; the piston (6) moves downward and drives the rack (9) to drive the gear (8), rotating rod (7), first bevel gear (10) and second bevel gear (11) to work together, so that the connecting pipe (3) and stirring plate (12) continue to rotate; S23. The stirring plate (12) rotates to promote the release of hydrogen from the metal hydride, and the released hydrogen is discharged from the tank (1) through the outlet pipe (14) extending below the piston (6).

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