A rapid hydrogenation device based on solid-state hydrogen storage

Abstract

The application discloses a kind of based on solid-state hydrogen storage's quick hydrogenation device, including T-type pool, tank docking mechanism, drive cylinder, water circulation frame and exchange heat mechanism, T-type pool both sides are rotatably connected with multiple tank docking mechanisms, hydrogen storage tank is detachably arranged on tank docking mechanism, tank docking mechanism is used to fix hydrogen storage tank and drive hydrogen storage tank to rotate, drive cylinder is rotatably arranged in T-type pool, each tank docking mechanism is rotatably connected with the output end of one drive cylinder, exchange heat mechanism is staggered with tank docking mechanism, exchange heat mechanism is used to heat dissipation to the heat of water in T-type pool, water circulation frame is fixedly connected at the bottom of T-type pool, water circulation frame is used to drive water in T-type pool to circulate and flow, to solve the problem that temperature regulation is not timely, not sufficient in prior art in the background art when hydrogen is added in solid hydrogen storage tank sometimes, affect hydrogenation speed.

Description

TECHNICAL FIELD

[0001] The application relates to a charging, battery replacing and hydrogen filling facility manufacturing, in particular to a solid-state hydrogen storage based rapid hydrogen filling device. BACKGROUND

[0002] The solid-state hydrogen storage is a reversible chemical reaction between specific alloy materials and hydrogen gas, and hydrogen storage is stable in the form of hydride solid. Compared with the traditional liquid hydrogen storage and high-pressure hydrogen storage, the solid-state hydrogen storage has lower tank pressure and does not need to maintain low temperature for a long time, and is safer and more economical.

[0003] The solid-state hydrogen storage requires a smaller pressure. The reaction on the surface of the alloy material during hydrogen absorption releases heat, and the heat is absorbed during hydrogen release. Different alloys have different suitable temperatures during hydrogen absorption. Precise temperature control during hydrogen filling can improve the hydrogen filling speed. The existing hydrogen filling method for solid-state hydrogen storage is to adjust the temperature of the hydrogen storage tank by water bath. However, the existing hydrogen filling equipment sometimes has the problem of delayed heat exchange, and the alloy material in the tank is difficult to fully exchange heat, which affects the hydrogen filling speed. SUMMARY

[0004] (I) Technical problems solved

[0005] In view of the defects of the prior art, the application provides a solid-state hydrogen storage based rapid hydrogen filling device to solve the problem of insufficient temperature control and slow hydrogen filling speed in the prior art.

[0006] (II) Technical solutions

[0007] To achieve the above purpose, the application provides the following technical solutions:

[0008] The preferred fast hydrogenation device based on solid-state hydrogen storage comprises a plurality of hydrogen storage tanks, a T-shaped water tank, a plurality of tank body docking mechanisms, a plurality of drive cylinders, a water circulation frame and an exchange heat mechanism, the T-shaped water tank is used for containing water, the plurality of hydrogen storage tanks are placed in the T-shaped water tank during hydrogenation, the tank body docking mechanisms are provided in plurality, a plurality of the tank body docking mechanisms are rotationally connected to the two sides of the T-shaped water tank, the hydrogen storage tanks are detachably arranged on the tank body docking mechanisms, the tank body docking mechanisms are used for fixing the hydrogen storage tanks and driving the hydrogen storage tanks to rotate, the drive cylinders are provided in plurality, the drive cylinders are rotationally arranged in the T-shaped water tank, each of the tank body docking mechanisms is rotationally connected to the output end of one of the drive cylinders, the exchange heat mechanism is fixedly connected to the two sides of the T-shaped water tank, the exchange heat mechanism and the tank body docking mechanism are staggered, the exchange heat mechanism is used for dissipating the heat of the water in the T-shaped water tank, and the water circulation frame is fixedly connected to the bottom of the T-shaped water tank, the water circulation frame is used for driving the water in the T-shaped water tank to circulate.

[0009] Further, the tank body docking mechanism comprises a bracket, a tank body docking assembly and a U-shaped frame, the bracket is rotationally connected to the T-shaped water tank, the output end of the drive cylinder is rotationally connected to the bracket, the tank body docking assembly is rotationally connected to one end of the bracket away from the drive cylinder, the tank body docking assembly is used for docking with the hydrogen storage tank, the U-shaped frame is fixedly connected to one side of the bracket close to the drive cylinder, the U-shaped frame is detachably connected to the hydrogen storage tank, the tank body docking assembly comprises a docking frame, a hydrogenation port and a lifting ring, the docking frame is rotationally connected to the bracket, the hydrogenation port is fixedly connected to the docking frame, a hydrogenation pipe is connected to the hydrogenation port, and the lifting ring is fixedly connected to the docking frame.

[0010] Further, when the hydrogen storage tank is in contact with the bracket, the hydrogenation port is opposite to the hydrogen storage tank, the docking frame is rotated, the hydrogen storage tank is opposite to the U-shaped frame, when the output end of the drive cylinder is elongated, the bracket can be pushed to rotate, the hydrogen storage tank can be rotated to a vertical state with the bracket, and at this time, the hydrogenation port is below the hydrogen storage tank.

[0011] As a further scheme of the present application, the water circulation frame is conical, water ports are formed on the two sides of the water circulation frame, the water ports on the two sides are respectively towards the two brackets, and a plurality of screw propeller parts are fixedly installed in the water circulation frame.

[0012] On the basis of the foregoing scheme, the heat exchange mechanism comprises heat exchange fins, heat conduction fins and air exchange fans, the heat exchange fins are provided in plurality, the plurality of heat exchange fins are fixedly connected on the T-shaped pool, the heat exchange fins penetrate the T-shaped pool, the heat exchange fins are arranged between two adjacent brackets, the heat conduction fins are provided in plurality, the plurality of heat conduction fins are fixedly connected on the heat exchange fins, one end of the heat conduction fins extending into the T-shaped pool is in an inclined shape, and faces the water circulation frame, the air exchange fans are provided in plurality, the plurality of air exchange fans are fixedly installed outside the T-shaped pool, the air exchange fans are arranged between two adjacent heat exchange fins, and air exchange openings are formed on both sides of the air exchange fans close to and away from the T-shaped pool.

[0013] Further, when the hydrogen storage tank is arranged on the bracket, the hydrogen storage tank is below the liquid level in the T-shaped pool.

[0014] In addition, it should be noted that the hydrogen filling pipe is a hose, and a pressure relief valve is arranged on one side of the hydrogen filling pipe close to the hydrogen filling opening, when the bracket rotates to keep the hydrogen storage tank in a vertical state, the hydrogen filling pipe is bent, and the pressure relief valve is at the lowest position of the hydrogen filling pipe.

[0015] (Three) beneficial effects

[0016] Compared with the prior art, the application provides a rapid hydrogen filling device based on solid-state hydrogen storage, which has the following beneficial effects:

[0017] In the application, the tank body docking mechanism is arranged to conveniently fix the hydrogen storage tank, and the hydrogen storage tank can be rotated, the principle of low hydrogen gas density is used to remove other gases in the hydrogen storage tank, the heat exchange mechanism is arranged to dissipate heat from the water on the side of the hydrogen storage tank, so that the temperature in the hydrogen storage tank is fully adjusted, therefore, the rapid hydrogen filling device based on solid-state hydrogen storage can conveniently install the hydrogen storage tank and fully adjust the temperature of the hydrogen storage tank, thereby shortening the hydrogen filling time, and other gases that may exist in the hydrogen storage tank can be discharged. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 It is a structure schematic view of the whole in a preferred embodiment of the application;

[0019] Figure 2 It is another perspective structure schematic view of the whole in a preferred embodiment of the application;

[0020] Figure 3 It is a cross-sectional structure schematic view of the relative connection between the tank body docking mechanism and the hydrogen storage tank in a preferred embodiment of the application;

[0021] Figure 4Figure 1 is a schematic diagram of the cross-sectional structure of the hydrogen filling pipe and the tank body docking mechanism in a preferred embodiment of the present application;

[0022] Figure 5 Figure 2 is a schematic diagram of the partial internal cross-sectional structure of the T-shaped pool in a preferred embodiment of the present application;

[0023] Figure 6 Figure 3 is a schematic diagram of the partial cross-sectional structure of the heat exchange sheet and the air exchange fan in a preferred embodiment of the present application.

[0024] In the figure: 1, hydrogen storage tank; 2, T-shaped pool; 3, driving cylinder; 4, water circulation frame; 5, bracket; 6, U-shaped frame; 7, docking frame; 8, hydrogen filling port; 9, hydrogen filling pipe; 10, lifting ring; 11, water changing port; 12, propeller component; 13, heat exchange sheet; 14, heat conduction sheet; 15, air exchange fan; 16, air exchange port; 17, pressure relief valve. DETAILED DESCRIPTION

[0025] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the present application.

[0026] Please refer to Figures 1 to 6The hydrogen storage equipment belongs to the field of charging, battery replacement and hydrogen filling facility manufacturing, and provides a fast hydrogen filling device based on solid-state hydrogen storage, which comprises a plurality of hydrogen storage tanks 1, a T-shaped pool 2, tank body docking mechanisms, drive cylinders 3, a water circulation frame 4 and an exchange heat mechanism, the T-shaped pool 2 is used for containing water, the plurality of hydrogen storage tanks 1 are placed in the T-shaped pool 2 when hydrogen filling, the tank body docking mechanisms are provided in plurality, a plurality of tank body docking mechanisms are rotatably connected to the two sides of the T-shaped pool 2, the hydrogen storage tanks 1 are detachably arranged on the tank body docking mechanisms, the tank body docking mechanisms are used for fixing the hydrogen storage tanks 1 and driving the hydrogen storage tanks 1 to rotate, the drive cylinders 3 are provided in plurality, the drive cylinders 3 are rotatably arranged in the T-shaped pool 2, and each tank body docking mechanism is rotatably connected with the output end of one drive cylinder 3, the exchange heat mechanism is fixedly connected to the two sides of the T-shaped pool 2, the exchange heat mechanism and the tank body docking mechanism are staggered, the exchange heat mechanism is used for dissipating the heat of the water in the T-shaped pool 2, the water circulation frame 4 is fixedly connected to the bottom of the T-shaped pool 2, and the water circulation frame 4 is used for driving the water in the T-shaped pool 2 to circulate, when hydrogen filling, the hydrogen storage tanks 1 are inserted into the brackets 5 and then connected with the hydrogen filling ports 8, then the bracket 7 is rotated to fix the tank bodies on the brackets 5, then the tank body docking mechanisms are driven by the drive cylinders 3 to rotate, so that the tank bodies are rotated into the T-shaped pool 2, the water in the T-shaped pool 2 is circulated by the water circulation frame 4, the heat in the hydrogen storage tanks 1 is uniformly distributed in the water in the T-shaped pool 2, and the water is cooled by the exchange heat mechanism, so that the heat is fully dissipated, compared with the traditional method of directly placing the hydrogen storage tanks 1 in water for water bath temperature control, the hydrogen storage tanks 1 are vertically arranged, on one hand, the tank bodies can be more uniformly contacted with water, and on the other hand, in the tank body, hydrogen gas is lighter and moves upward, so that the remaining gas in the tank body can be squeezed out to the lower part of the tank body, and the impurity gas in the tank body can be removed.

[0027] Please refer to Figures 1 to 4Further, the tank docking mechanism comprises a bracket 5, a tank docking assembly and a U-shaped frame 6, the bracket 5 is rotationally connected with the T-shaped pool 2, the output end of the driving cylinder 3 is rotationally connected with the bracket 5, the tank docking assembly is rotationally connected with the bracket 5 at an end away from the driving cylinder 3, the tank docking assembly is used for docking with the hydrogen storage tank 1, the U-shaped frame 6 is fixedly connected with the bracket 5 at a side close to the driving cylinder 3, the U-shaped frame 6 is detachably connected with the hydrogen storage tank 1, the tank docking assembly comprises a docking frame 7, a hydrogen filling port 8 and a lifting ring 10, the docking frame 7 is rotationally connected with the bracket 5, the hydrogen filling port 8 is fixedly connected with the docking frame 7, the hydrogen filling port 8 is connected with a hydrogen filling pipe 9, the lifting ring 10 is fixedly connected with the docking frame 7, the lifting ring 10 is detachably connected with the hydrogen storage tank 1, when the hydrogen storage tank 1 is docked again, one end of the hydrogen storage tank 1 for hydrogen charging and discharging is passed through the lifting ring 10 and then is docked with the hydrogen filling port 8 on the docking frame 7, at this time, the docking frame 7 is rotated to make the hydrogen storage tank 1 dock with the U-shaped frame 6, at this time, the hydrogen storage tank 1 is fixed on the bracket 5, at this time, water can be added into the T-shaped pool 2 to make the water cover the hydrogen storage tank 1, the bracket 5 is rotated by the extension of the output end of the driving cylinder 3, the hydrogen storage tank 1 is in a vertical state by rotation, at this time, the heat exchange fins 13 are on the side of the hydrogen storage tank 1, which is more conducive to heat dissipation of the hydrogen storage tank 1, the hydrogen storage tank 1 is fixed conveniently by docking with the docking frame 7 and then rotating to dock with the U-shaped frame 6, and the time for fixing the hydrogen storage tank 1 is reduced.

[0028] Please refer to Figures 3 to 4 Further, when the hydrogen storage tank 1 contacts with the bracket 5, the hydrogen filling port 8 is opposite to the hydrogen storage tank 1, the docking frame 7 is rotated, the hydrogen storage tank 1 is opposite to the U-shaped frame 6, when the output end of the driving cylinder 3 is extended, the bracket 5 is rotated, the hydrogen storage tank 1 is rotated to a vertical state with the bracket 5, at this time, the hydrogen filling port 8 is below the hydrogen storage tank 1, after rotation, the hydrogen filling port 8 is below the hydrogen storage tank 1, hydrogen is added into the hydrogen storage tank 1 from below, because the mass of hydrogen is lower than that of air, hydrogen moves upward in the hydrogen storage tank 1, hydrogen reacts with the alloy material to store hydrogen, and because hydrogen is lighter, other gases mixed in the hydrogen storage tank 1 during use are pressed by hydrogen to move to the direction of the hydrogen filling port 8, and the other gases continuously move downward.

[0029] Please refer to Figure 5As a further scheme of the application, the water circulation frame 4 is conical, water exchange openings 11 are arranged on both sides of the water circulation frame 4, the water exchange openings 11 on both sides face the brackets 5 on both sides, a plurality of propeller components 12 are fixedly installed in the water circulation frame 4, and the two sides of the water circulation frame 4 are arc-shaped. Through the water exchange openings 11, water on both sides can flow through the water circulation frame 4. The driving components on the propeller components can be driven by a motor or the like. The motor drives the propeller to rotate, and the propeller can drive the water in the T-shaped water tank 2 to enter the water exchange opening 11 on one side and flow out of the water exchange opening 11 on the other side, so that the water circulates in the T-shaped water tank 2 through the water circulation frame 4, avoiding that the water temperature around the hydrogen storage tank 1 is relatively high and the water temperature at other positions is low, so that the temperature regulation effect is low.

[0030] Please refer to Figure 1 and Figure 6 On the basis of the foregoing scheme, the heat exchange mechanism comprises heat exchange fins 13, heat conduction fins 14 and air exchange fans 15. The heat exchange fins 13 are provided in plurality, are fixedly connected to the T-shaped water tank 2, penetrate the T-shaped water tank 2, and are arranged between two adjacent brackets 5. The heat conduction fins 14 are provided in plurality, are fixedly connected to the heat exchange fins 13, and have an end inserted into the T-shaped water tank 2 and inclined toward the water circulation frame 4. The air exchange fans 15 are provided in plurality, are fixedly installed outside the T-shaped water tank 2, and are arranged between two adjacent heat exchange fins 13. Air exchange openings 16 are arranged on both sides of the air exchange fans 15 close to and away from the T-shaped water tank 2. Since the heat conduction fins 14 are inclined toward the water circulation frame 4, when the water in the T-shaped water tank 2 is circulated by the propeller components, the water is sprayed or flows into the water exchange openings 11, and the water in contact with the heat conduction fins 14 flows along the heat conduction fins 14, fully contacts the heat conduction fins 14 and the heat exchange fins 13, and transfers heat to the outside through the heat conduction fins 14 and the heat exchange fins 13. When the air exchange fans 15 are started, air flow is blown to the outer wall of the T-shaped water tank 2, moves to both sides and contacts the heat exchange fins 13, carries away the heat on the heat exchange fins 13 and fully cools the heat exchange fins 13. A plurality of temperature sensors can be arranged in the T-shaped water tank 2 to adjust the heat dissipation efficiency of the heat exchange fins 13 by the air exchange fans 15 according to the change of the temperature.

[0031] Please refer to Figures 3 to 4 Further, when the hydrogen storage tank 1 is arranged on the bracket 5, the hydrogen storage tank 1 is below the liquid level in the T-shaped water tank 2. When the hydrogen storage tank 1 is fixed, the T-shaped water tank 2 can not be filled with water. After the hydrogen storage tank 1 is connected to the U-shaped frame 6, water can be added to cover the hydrogen storage tank 1. At this time, the gas tank can be cooled first, and then the bracket 5 is rotated for hydrogen filling.

[0032] Please refer to Figure 4, in addition, it is pointed out that, hydrogenation pipe 9 using hose, hydrogenation pipe 9 close to the side of hydrogenation mouth 8 is provided with pressure relief valve 17, when the bracket 5 rotates and makes the hydrogen storage tank 1 keep vertical state, hydrogenation pipe 9 is bent, pressure relief valve 17 is at the lowest of hydrogenation pipe 9, with the rotation of bracket 5, hydrogenation pipe 9 is bent and rotated, hydrogenation pipe 9 is folded into U type, pressure relief valve 17 moves to the lowest with the rotation of hydrogenation pipe 9, with hydrogenation pipe 9 and hydrogenation mouth 8 into hydrogen storage tank 1 into hydrogen, other gas moves to the lowest in hydrogenation pipe 9, with the increase of pressure, pressure relief valve 17 opens and discharges impurity gas and part of hydrogen through pressure relief valve 17, the discharge of gas can also be observed through the water bubble, then the pressure of hydrogen can be reduced to stop the discharge of gas, at this time, hydrogenation is completed.

[0033] In summary, the rapid hydrogenation device based on solid-state hydrogen storage carries out hydrogenation, first, the hydrogen storage tank 1 is connected with the hydrogenation mouth 8 through the lifting ring 10, the lifting ring 10 supports and stabilizes the hydrogen storage tank 1, the hydrogen storage tank 1 is connected with the U-shaped frame 6 by rotating, at this time, the hydrogen storage tank 1 is fixed on the bracket 5, water can be added to the T-shaped pool 2 at this time, so that the water level is higher than the hydrogen storage tank 1, when hydrogenation is carried out, the output end of the driving cylinder 3 is elongated to push the bracket 5 to rotate, so that the hydrogen storage tank 1 is rotated to the vertical state, the hydrogenation pipe 9 is bent, at this time, hydrogen is added to the hydrogen storage tank 1 through the hydrogenation pipe 9 and the hydrogenation mouth 8, the water in the T-shaped pool 2 is circulated by the propeller part, the water contacts the heat exchange fin 13 and the heat conduction fin 14, the heat is transferred to the outside of the T-shaped pool 2, the air fan 15 starts to cool the heat exchange fin 13, when hydrogenation is completed, the hydrogen pressure in the hydrogenation pipe 9 rises, the hydrogen moves upward in the hydrogenation pipe 9 and the hydrogen storage tank 1, other gas moves downward to the pressure relief valve 17, with the increase of pressure, the pressure relief valve 17 opens and discharges other gas and part of hydrogen, the exhaust is observed through the water surface, the hydrogen pressure in the hydrogenation pipe 9 is reduced at this time, hydrogenation is completed.

[0034] Although embodiments of the present application have been shown and described, it is to be understood that various modifications, substitutions, replacements and changes can be made to these embodiments without departing from the principles and spirit of the present application, the scope of the present application being defined by the appended claims and their equivalents.

Claims

1. A rapid hydrogen refueling device based on solid-state hydrogen storage, comprising multiple hydrogen storage tanks (1), characterized in that, Also includes: T-shaped water tank (2), which is used to hold water, and multiple hydrogen storage tanks (1) are placed in the T-shaped water tank (2) when hydrogen is added; Multiple tank docking mechanisms are provided. Multiple tank docking mechanisms are rotatably connected to both sides of the T-shaped water tank (2). The hydrogen storage tank (1) is detachably mounted on the tank docking mechanism. The tank docking mechanism is used to fix the hydrogen storage tank (1) and drive the hydrogen storage tank (1) to rotate. Multiple drive cylinders (3) are provided. The drive cylinders (3) are rotatably disposed in the T-shaped water tank (2). Each tank docking mechanism is rotatably connected to the output end of one drive cylinder (3). A heat exchange mechanism is fixedly connected to both sides of the T-shaped water tank (2). The heat exchange mechanism and the tank docking mechanism are staggered. The heat exchange mechanism is used to dissipate heat from the water in the T-shaped water tank (2). A water circulation frame (4) is fixedly connected to the bottom of the T-shaped water tank (2). The water circulation frame (4) is used to drive the water in the T-shaped water tank (2) to circulate. The tank docking mechanism includes: The bracket (5) is rotatably connected to the T-shaped water tank (2), and the output end of the drive cylinder (3) is rotatably connected to the bracket (5); The tank docking assembly is rotatably connected to the bracket (5) at one end away from the drive cylinder (3), and the tank docking assembly is used to dock with the hydrogen storage tank (1); The U-shaped frame (6) is fixedly connected to the bracket (5) on the side near the drive cylinder (3), and the U-shaped frame (6) is detachably connected to the hydrogen storage tank (1). The tank docking assembly includes: The docking frame (7) is rotatably connected to the bracket (5); Hydrogen filling port (8) is fixedly connected to the docking frame (7), and a hydrogen filling pipe (9) is connected to the hydrogen filling port (8). The lifting ring (10) is fixedly connected to the docking frame (7), and the lifting ring (10) is detachably connected to the hydrogen storage tank (1); When the hydrogen storage tank (1) comes into contact with the bracket (5), the hydrogen filling port (8) is aligned with the hydrogen storage tank (1), and the docking frame (7) is rotated so that the hydrogen storage tank (1) is aligned with the U-shaped frame (6).

2. The rapid hydrogen refueling device based on solid-state hydrogen storage according to claim 1, characterized in that, When the output end of the drive cylinder (3) extends, it can push the bracket (5) to rotate, and the hydrogen storage tank (1) can rotate with the bracket (5) to a vertical state. At this time, the hydrogen filling port (8) is located below the hydrogen storage tank (1).

3. The rapid hydrogen refueling device based on solid-state hydrogen storage according to claim 2, characterized in that, The water circulation frame (4) is cone-shaped, and water exchange ports (11) are provided on both sides of the water circulation frame (4). The water exchange ports (11) on both sides face the brackets (5) on both sides respectively. Multiple propeller components (12) are fixedly installed in the water circulation frame (4).

4. The rapid hydrogen refueling device based on solid-state hydrogen storage according to claim 3, characterized in that, The heat exchange mechanism includes: Multiple heat exchange plates (13) are provided, and multiple heat exchange plates (13) are fixedly connected to the T-shaped water tank (2). The heat exchange plates (13) penetrate the T-shaped water tank (2) and are arranged between two adjacent brackets (5). Multiple heat-conducting plates (14) are provided. The multiple heat-conducting plates (14) are fixedly connected to the heat exchange plate (13). One end of the heat-conducting plate (14) extending into the T-shaped water tank (2) is inclined and faces the water circulation frame (4). Multiple ventilation fans (15) are provided. Multiple ventilation fans (15) are fixedly installed on the outside of the T-shaped water tank (2). The ventilation fans (15) are located between two adjacent heat exchange plates (13). Ventilation ports (16) are provided on both sides of the ventilation fan (15) that are close to and far from the T-shaped water tank (2).

5. A rapid hydrogen refueling device based on solid-state hydrogen storage according to claim 4, characterized in that, When the hydrogen storage tank (1) is placed on the bracket (5), the hydrogen storage tank (1) is below the liquid level in the T-shaped water tank (2).

6. A rapid hydrogen refueling device based on solid-state hydrogen storage according to claim 5, characterized in that, The hydrogen filling pipe (9) uses a flexible hose. A pressure relief valve (17) is provided on the side of the hydrogen filling pipe (9) near the hydrogen filling port (8). When the bracket (5) rotates to keep the hydrogen storage tank (1) in a vertical position, the hydrogen filling pipe (9) bends and the pressure relief valve (17) is at the lowest point of the hydrogen filling pipe (9).

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