Self-pressurization system for liquid hydrogen cylinder and vehicle
By setting up a heat exchange pipeline in the liquid hydrogen cylinder for heat exchange, the problem of self-pressure-increasing method destroying cold storage balance is solved, and efficient self-pressure-increasing is achieved, reducing costs and extending the liquid hydrogen storage time.
Patent Information
- Application Number
- CN202422306554.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-20
- Publication Date
- 2025-07-11
- Estimated Expiration
- 2034-09-20
AI Technical Summary
The self-pressurization method of existing liquid hydrogen cylinders will destroy the cold storage equilibrium state, resulting in excessive evaporation of liquid hydrogen, reducing storage time, and the external boost structure takes up space and consumes additional media, which is costly.
A heat exchange pipeline is set up in the liquid hydrogen cylinder to exchange heat with the cold hydrogen in the gas phase space. The air phase space pressure is increased by expanding the cold hydrogen gas, realizing a self-pressurization cycle, avoiding direct heating of hydrogen gas into the gas cylinder, and using pure heat exchange to maintain the cooling capacity balance.
It realizes self-pressure without additional boosting structure, reduces costs, improves liquid hydrogen storage time, avoids cold balance damage, and enhances storage efficiency.
Smart Images
Figure CN223090413U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of liquid hydrogen, in particular to a self-pressurizing system and a vehicle for a liquid hydrogen cylinder. Background Art
[0002] Liquid hydrogen is usually stored in liquid hydrogen cylinders. During use, the liquid hydrogen needs to be pressed out by increasing the pressure in the cylinder. The pressed liquid hydrogen is vaporized through the system and supplied to the fuel cell. Therefore, the pressurization method must ensure high efficiency and safety.
[0003] In the related art, traditional liquid hydrogen cylinders use external pressurization or self-pressurization to achieve internal pressurization of liquid hydrogen cylinders. External pressurization uses an additional pressurization structure to pass high-pressure medium into the cylinder to achieve cylinder pressurization. However, the external pressurization structure will occupy more space and mass, and require additional medium and power, which is costly. The current self-pressurization method will destroy the cold storage equilibrium state of the liquid hydrogen cylinder, causing a new round of heat exchange inside the liquid hydrogen cylinder, resulting in excessive evaporation of liquid hydrogen inside the liquid hydrogen cylinder, and reducing the static storage time of liquid hydrogen in the liquid hydrogen cylinder itself. Utility Model Content
[0004] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, the first purpose of the utility model is to propose a self-pressurizing system for a liquid hydrogen cylinder.
[0005] The second objective of the present invention is to provide a vehicle.
[0006] To achieve the above-mentioned purpose, the first embodiment of the utility model proposes a self-pressurizing system for a liquid hydrogen cylinder, comprising:
[0007] A heat exchange pipeline, at least part of which is arranged in the gas phase space in the liquid hydrogen cylinder;
[0008] A vaporizer, the vaporizer has a first inlet and a first outlet that are connected, the first inlet is connected to the liquid phase space in the liquid hydrogen cylinder, the first outlet is connected to one end of the heat exchange pipeline, the vaporizer also has a second inlet and a second outlet that are connected, the second inlet is connected to the other end of the heat exchange pipeline, and the second outlet is connected to the fuel cell.
[0009] According to the self-pressurizing system for a liquid hydrogen cylinder according to an embodiment of the present utility model, by arranging a heat exchange pipeline inside the liquid hydrogen cylinder and ensuring that at least a part of the heat exchange pipeline is arranged in the gas phase space inside the liquid hydrogen cylinder, so that the heated hydrogen gas exchanges heat with the cold hydrogen gas in the gas phase space through the heat exchange pipeline, and the cold hydrogen gas expands when heated, increasing the pressure in the gas phase space, thereby promoting the continuous flow of liquid hydrogen from the first inlet into the vaporizer, realizing a self-pressurizing cycle, without the need to additionally increase an external pressurizing structure, which is beneficial to cost reduction, and the heat exchange between the heat exchange pipeline and the cold hydrogen gas in the gas phase space is a pure heat exchange without mass transfer, thus avoiding the destruction of the cold quantity balance caused by directly introducing the heated hydrogen gas into the interior of the liquid hydrogen cylinder, and being beneficial to improving the liquid hydrogen storage time.
[0010] According to some examples of the present utility model, the heat exchange pipeline has a heat exchange part, and the heat exchange part is arranged in the gas phase space.
[0011] According to some examples of the present utility model, the heat exchange part is configured as a coiled pipe structure.
[0012] According to some examples of the present utility model, the heat exchange part is configured as a serpentine pipe structure.
[0013] According to some examples of the present utility model, the heat exchange pipeline is configured as a metal pipe.
[0014] According to some examples of the present utility model, it further includes: a first pipeline, one end of the first pipeline extends into the liquid phase space, and the other end is communicated with the first inlet.
[0015] According to some examples of the present utility model, it further includes: a second pipeline, one end of the second pipeline is communicated with the first outlet, and the other end is communicated with the heat exchange pipeline.
[0016] According to some examples of the present utility model, it further includes: a third pipeline, one end of the third pipeline is communicated with the second inlet, and the other end is communicated with the heat exchange pipeline.
[0017] According to some examples of the present utility model, it further includes: a fourth pipeline, which is communicated between the second outlet and the fuel cell.
[0018] To achieve the above object, an embodiment of the second aspect of the present utility model proposes a vehicle, including: a fuel cell system, a liquid hydrogen cylinder, and a self-pressurizing system, wherein the self-pressurizing system is the self-pressurizing system for a liquid hydrogen cylinder in the embodiment of the first aspect, and the self-pressurizing system is communicated between the fuel cell system and the liquid hydrogen cylinder.
[0019] According to the vehicle of the embodiment of the present utility model, by providing the above-mentioned self-pressurizing system for the liquid hydrogen cylinder, a self-pressurizing cycle is realized, without the need to additionally increase an external pressurizing structure, which is beneficial to cost reduction. Moreover, the heat exchange between the heat exchange pipeline and the cold hydrogen in the gas phase space is a pure heat exchange, without mass transfer, thereby avoiding the destruction of the cold quantity balance caused by directly introducing the heated hydrogen into the liquid hydrogen cylinder, which is beneficial to improving the liquid hydrogen storage time.
[0020] Additional aspects and advantages of the present utility model will be given in part in the following description, become apparent in part from the following description, or be learned through the practice of the present utility model. BRIEF DESCRIPTION OF THE DRAWINGS
[0021] The above and / or additional aspects and advantages of the present utility model will become apparent and be readily understood from the description of the embodiments in conjunction with the following drawings, in which:
[0022] Figure 1 It is a schematic diagram of a self-pressurizing system and a liquid hydrogen cylinder according to an embodiment of the present utility model.
[0023] Reference numerals:
[0024] Self-pressurizing system 100 for liquid hydrogen cylinder;
[0025] Heat exchange pipeline 1;
[0026] Vaporizer 2; First inlet 21; First outlet 22; Second inlet 23; Second outlet 24;
[0027] First pipeline 3; Second pipeline 4; Third pipeline 5; Fourth pipeline 6;
[0028] Liquid hydrogen cylinder 200; Gas phase space 201; Liquid phase space 202. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0029] Embodiments of the present utility model will be described in detail below. Examples of the embodiments are shown in the drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary only for explaining the present utility model and should not be construed as limiting the present utility model.
[0030] It should be noted that liquid hydrogen is usually stored in a liquid hydrogen cylinder. During use, it is necessary to pressurize the liquid hydrogen in the cylinder to press it out, and the pressed liquid hydrogen is vaporized by the system and supplied to the fuel cell for use. Therefore, the pressurization method must ensure high efficiency and safety.
[0031] In the related art, traditional liquid hydrogen cylinders achieve internal pressurization of the liquid hydrogen cylinder through external pressurization or self-pressurization methods. External pressurization introduces a high-pressure medium into the cylinder through an additional pressurization structure to achieve cylinder pressurization. However, the external pressurization structure occupies more space and mass, and requires the consumption of additional medium and power, resulting in higher costs. The current self-pressurization method reintroduces the pressurized gaseous hydrogen into the cylinder through structural design to achieve a self-circulation of the gaseous phase inside the liquid hydrogen cylinder, thereby realizing the self-pressurization of the liquid hydrogen cylinder. However, the high-temperature and high-pressure gas entering the cylinder after circulation will disrupt the cold storage equilibrium state of the liquid hydrogen cylinder, causing a new round of heat exchange inside the liquid hydrogen cylinder, leading to excessive evaporation of the liquid hydrogen inside the liquid hydrogen cylinder and reducing the static storage time of the liquid hydrogen in the liquid hydrogen cylinder itself.
[0032] Based on this, the present application proposes a self-pressurization system 100 for a liquid hydrogen cylinder. By arranging the heat exchange pipeline 1 inside the liquid hydrogen cylinder 200 and ensuring that at least part of the heat exchange pipeline 1 is located in the gaseous phase space 201 inside the liquid hydrogen cylinder 200, the heated hydrogen can exchange heat with the cold hydrogen in the gaseous phase space 201 through the heat exchange pipeline 1. The cold hydrogen expands when heated, increasing the pressure in the gaseous phase space 201, thereby promoting the continuous flow of liquid hydrogen from the first inlet 21 into the vaporizer 2, realizing a self-pressurization cycle. There is no need to additionally increase an external pressurization structure, which is beneficial to cost reduction. Moreover, the heat exchange between the heat exchange pipeline 1 and the cold hydrogen in the gaseous phase space 201 is a pure heat exchange without mass transfer, thus avoiding the destruction of the cold quantity balance caused by directly introducing heated hydrogen into the inside of the liquid hydrogen cylinder 200, which is beneficial to improving the liquid hydrogen storage time.
[0033] Next, a self-pressurization system 100 for a liquid hydrogen cylinder and a vehicle according to an embodiment of the present invention will be described with reference to the accompanying drawings.
[0034] As Figure 1 shown, a self-pressurization system 100 for a liquid hydrogen cylinder according to a first aspect embodiment of the present invention includes: a heat exchange pipeline 1 and a vaporizer 2.
[0035] It should be noted that in addition to liquid hydrogen, the liquid hydrogen cylinder 200 usually also includes gaseous hydrogen. Among them, the space occupied by gaseous hydrogen is the gaseous phase space 201, the space occupied by liquid hydrogen is the liquid phase space 202, and the height line of the liquid hydrogen in the liquid hydrogen cylinder 200 is the liquid level line. Specifically, at least part of the heat exchange pipeline 1 is located in the gaseous phase space 201 inside the liquid hydrogen cylinder 200, that is to say, the heat exchange pipeline 1 can be completely arranged in the space occupied by gaseous hydrogen, or part of it can be arranged in the space occupied by gaseous hydrogen and part in the space occupied by liquid hydrogen, that is, part of the heat exchange pipeline 1 is located above the liquid level line and part below the liquid level line.
[0036] Further, the vaporizer 2 has a connected first inlet 21 and a first outlet 22. Among them, the first inlet 21 of the vaporizer 2 is connected to the liquid phase space 202 in the liquid hydrogen cylinder 200. In this way, the liquid hydrogen in the liquid hydrogen cylinder 200 flows into the vaporizer 2 through the first inlet 21, and is vaporized into hot hydrogen after being heated by the vaporizer 2. Further, the first outlet 22 of the vaporizer 2 is connected to one end of the heat exchange pipeline 1. Therefore, the hot hydrogen flows out of the first outlet 22 of the vaporizer 2 and enters the heat exchange pipeline 1. It can be understood that the hot hydrogen in the heat exchange pipeline 1 can exchange heat with the cold hydrogen in the gas phase space 201 through the heat exchange pipeline 1. The cold hydrogen expands when heated, increasing the pressure in the gas phase space 201, thereby promoting the continuous flow of liquid hydrogen from the first inlet 21 into the vaporizer 2, realizing a self-pressurizing cycle without the need to additionally increase an external pressurizing structure, which is beneficial to cost reduction. Since the heat exchange between the heat exchange pipeline 1 and the cold hydrogen in the gas phase space 201 is a pure heat exchange without mass transfer, it avoids the destruction of the cold quantity balance caused by directly introducing the heated hydrogen into the liquid hydrogen cylinder 200, which is beneficial to improving the liquid hydrogen storage time.
[0037] Further, the vaporizer 2 also has a connected second inlet 23 and a second outlet 24. The second inlet 23 is connected to the other end of the heat exchange pipeline 1, and the second outlet 24 is connected to the fuel cell. That is to say, the hot hydrogen in the heat exchange pipeline 1 re-enters the vaporizer 2 through the second inlet 23 after heat exchange, and flows out of the vaporizer 2 through the second outlet 24 to supply hydrogen to the fuel cell. It can be understood that the hydrogen entering the vaporizer 2 from the second inlet 23 can be pressurized again in the vaporizer 2 to ensure that the hydrogen flowing out of the second outlet 24 meets the target air pressure required by the fuel cell.
[0038] It should be noted that since there is no mass transfer between the heat exchange pipeline 1 and the cold hydrogen in the gas phase space 201, it avoids the destruction of the cold quantity balance caused by directly introducing the heated hydrogen into the liquid hydrogen cylinder 200. Therefore, it can more effectively press out the liquid hydrogen, which is beneficial to solving the situation where the self-pressurizing effect of liquid hydrogen decreases at a lower liquid level. At the same time, when part of the heat exchange pipeline 1 is arranged above the liquid level line and part is arranged below the liquid level line, it can not only realize the heat exchange between the gas-phase cold hydrogen in the liquid hydrogen cylinder 200 and the hot hydrogen in the heat exchange pipeline 1, but also ensure the minimum heat exchange between the liquid hydrogen in the liquid phase space 202 and the hot hydrogen in the heat exchange pipeline 1.
[0039] According to the self - pressurizing system 100 for a liquid hydrogen cylinder according to an embodiment of the present utility model, by disposing the heat exchange pipeline 1 inside the liquid hydrogen cylinder 200 and ensuring that at least a part of the heat exchange pipeline 1 is disposed in the gas phase space 201 inside the liquid hydrogen cylinder 200, the heated hydrogen gas can exchange heat with the cold hydrogen gas in the gas phase space 201 through the heat exchange pipeline 1. The cold hydrogen gas expands when heated, increasing the pressure in the gas phase space 201, thereby promoting the continuous inflow of liquid hydrogen from the first inlet 21 into the vaporizer 2, realizing a self - pressurizing cycle. There is no need to additionally increase an external pressurizing structure, which is beneficial to cost reduction. Moreover, the heat exchange between the heat exchange pipeline 1 and the cold hydrogen gas in the gas phase space 201 is a pure heat exchange without mass transfer, thus avoiding the destruction of the cold quantity balance caused by directly introducing the heated hydrogen gas into the inside of the liquid hydrogen cylinder 200, which is beneficial to increasing the liquid hydrogen storage time.
[0040] In some examples of the present utility model, the heat exchange pipeline 1 has a heat exchange part, and the heat exchange part is disposed in the gas phase space 201. That is to say, a heat exchange part can be provided on the heat exchange pipeline 1 and the heat exchange part is completely placed inside the gas phase space 201. With this setting, the hot hydrogen gas flowing through the heat exchange part exchanges heat with the cold hydrogen gas in the gas phase space 201, meeting the heat exchange requirements and there is no mass transfer. At the same time, it can further prevent the liquid hydrogen in the liquid phase space 202 from exchanging heat with the hot hydrogen gas in the heat exchange pipeline 1.
[0041] In some examples of the present utility model, the heat exchange part is configured as a coiled pipe structure. That is to say, the heat exchange part can be configured as a coiled pipe structure. The coiled pipe design can increase the contact duration and area between the hot hydrogen gas in the heat exchange part and the cold hydrogen gas in the gas phase space 201, which is beneficial to improving the heat exchange efficiency, enabling the cold hydrogen gas in the gas phase space 201 to be better heated and expanded, thereby increasing the pressure in the gas phase space 201, and further improving the self - pressurizing effect.
[0042] In some examples of the present utility model, the heat exchange part is configured as a serpentine pipe structure. That is to say, the heat exchange part can be configured as a serpentine pipe structure. The serpentine pipe design can also increase the contact duration and area between the hot hydrogen gas in the heat exchange part and the cold hydrogen gas in the gas phase space 201, which is beneficial to improving the heat exchange efficiency, enabling the cold hydrogen gas in the gas phase space 201 to be better heated and expanded, thereby increasing the pressure in the gas phase space 201, and further improving the self - pressurizing effect.
[0043] In some examples of the present utility model, the heat exchange pipeline 1 is configured as a metal pipe. That is to say, the heat exchange pipeline 1 can be made of metal to form a metal pipe. For example, the metal pipe can be a copper pipe or a stainless - steel pipe, etc. In this way, due to improving the heat exchange efficiency of the heat exchange pipeline 1, the cold hydrogen gas in the gas phase space 201 is better heated and expanded, thereby increasing the pressure in the gas phase space 201, and further improving the self - pressurizing effect.
[0044] In some examples of the present utility model, as Figure 1 shown, it further includes: a first pipeline 3, one end of the first pipeline 3 extends into the liquid phase space 202, and the other end is connected to the first inlet 21. That is to say, the liquid hydrogen cylinder 200 is connected to the first inlet 21 of the vaporizer 2 through the first pipeline 3, and one end of the first pipeline 3 extends into the liquid phase space 202. In this way, it is convenient for the liquid hydrogen in the liquid phase space 202 to flow into the vaporizer 2 through the first pipeline 3 for heating and gasification.
[0045] In some examples of the present utility model, as Figure 1 shown, it further includes: a second pipeline 4, one end of the second pipeline 4 is connected to the first outlet 22, and the other end is connected to the heat exchange pipeline 1. That is to say, the second pipeline 4 is connected between the first outlet 22 of the vaporizer 2 and the heat exchange pipeline 1. The second pipeline 4 can be welded to the heat exchange pipeline 1 or connected by bolts, which is specifically selected according to the actual situation. In this way, the heated hydrogen flows into the heat exchange pipeline 1 through the second pipeline 4, so as to facilitate the heat exchange between the hot hydrogen in the heat exchange pipeline 1 and the cold hydrogen in the gas phase space 201.
[0046] In some examples of the present utility model, as Figure 1 shown, it further includes: a third pipeline 5, one end of the third pipeline 5 is connected to the second inlet 23, and the other end is connected to the heat exchange pipeline 1. That is to say, the third pipeline 5 is connected between the second inlet 23 of the vaporizer 2 and the heat exchange pipeline 1. The third pipeline 5 can be welded to the heat exchange pipeline 1 or connected by bolts, which is specifically selected according to the actual situation. In this way, it is convenient for the hydrogen after heat exchange to re-enter the vaporizer 2 through the third pipeline 5.
[0047] In some examples of the present utility model, as Figure 1 shown, it further includes: a fourth pipeline 6, and the fourth pipeline 6 is connected between the second outlet 24 and the fuel cell. That is to say, the hydrogen flowing into the second outlet 24 of the vaporizer 2 can flow into the fuel cell through the fourth pipeline 6, which is convenient for supplying hydrogen to the fuel cell.
[0048] The vehicle according to the embodiment of the second aspect of the present utility model includes: a fuel cell system, a liquid hydrogen cylinder 200, and a self-pressurizing system 100. Among them, the self-pressurizing system 100 is the self-pressurizing system 100 for the liquid hydrogen cylinder in the embodiment of the first aspect. The self-pressurizing system 100 is connected between the fuel cell system and the liquid hydrogen cylinder 200. Specifically, the first inlet 21 of the vaporizer 2 is connected to the liquid phase space 202 in the liquid hydrogen cylinder 200, the first outlet 22 of the vaporizer 2 is connected to one end of the heat exchange pipeline 1, the second inlet 23 of the vaporizer 2 is connected to the other end of the heat exchange pipeline 1, and the second outlet 24 of the vaporizer 2 is connected to the fuel cell system.
[0049] According to the vehicle of the embodiment of the present utility model, by providing the above-mentioned self-pressurizing system 100 for the liquid hydrogen cylinder, a self-pressurizing cycle is realized, without the need to additionally increase an external pressurizing structure, which is beneficial to cost reduction. Moreover, the heat exchange between the heat exchange pipeline 1 and the cold hydrogen in the gas phase space 201 is a pure heat exchange without mass transfer, thus avoiding the destruction of the cold quantity balance caused by directly introducing the heated hydrogen into the liquid hydrogen cylinder 200, which is beneficial to improving the liquid hydrogen storage time.
[0050] It should be noted that in the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be understood as a limitation of the present utility model.
[0051] In the description of the present utility model, it should be noted that unless otherwise clearly specified and limited, the terms "installation", "connection", and "connection" 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 or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.
[0052] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present utility model. 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 can be combined in a suitable manner in any one or more embodiments or examples.
[0053] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" can explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.
[0054] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present invention.
Claims
1. A self-pressurizing system for a liquid hydrogen cylinder, characterized in that, Comprising: A heat exchange pipeline (1), at least a part of the heat exchange pipeline (1) is arranged in the gas phase space (201) inside the liquid hydrogen cylinder (200); A vaporizer (2), the vaporizer (2) has a first inlet (21) and a first outlet (22) that are communicated, the first inlet (21) is communicated with the liquid phase space (202) inside the liquid hydrogen cylinder (200), the first outlet (22) is communicated with one end of the heat exchange pipeline (1), the vaporizer (2) also has a second inlet (23) and a second outlet (24) that are communicated, the second inlet (23) is communicated with the other end of the heat exchange pipeline (1), and the second outlet (24) is communicated with a fuel cell.
2. The self-pressurizing system for a liquid hydrogen cylinder according to claim 1, wherein, The heat exchange pipeline (1) has a heat exchange part, and the heat exchange part is arranged in the gas phase space (201).
3. The self-pressurizing system for a liquid hydrogen cylinder according to claim 2, characterized in that, The heat exchange part is configured as a coiled pipe structure.
4. The self-pressurizing system for a liquid hydrogen cylinder according to claim 2, characterized in that, The heat exchange part is configured as a serpentine pipe structure.
5. The self-pressurizing system for a liquid hydrogen cylinder according to claim 1, characterized in that, The heat exchange pipeline (1) is configured as a metal pipe.
6. The self-pressurizing system for a liquid hydrogen cylinder according to any one of claims 1-5, characterized in that, Further comprising: A first pipeline (3), one end of the first pipeline (3) extends into the liquid phase space (202), and the other end is communicated with the first inlet (21).
7. The self-pressurizing system for a liquid hydrogen cylinder according to any one of claims 1-5, characterized in that, Further comprising: A second pipeline (4), one end of the second pipeline (4) is communicated with the first outlet (22), and the other end is communicated with the heat exchange pipeline (1).
8. The self-pressurizing system for a liquid hydrogen cylinder according to any one of claims 1-5, characterized in that, Further comprising: A third pipeline (5), one end of the third pipeline (5) is communicated with the second inlet (23), and the other end is communicated with the heat exchange pipeline (1).
9. The self-pressurizing system for a liquid hydrogen cylinder according to any one of claims 1-5, characterized in that, Further comprising: A fourth pipeline (6), which is connected between the second outlet (24) and the fuel cell.
10. A vehicle, characterized in that, Comprising: A fuel cell system, a liquid hydrogen cylinder (200) and a self-pressurizing system (100), wherein, the self-pressurizing system (100) is the self-pressurizing system (100) for a liquid hydrogen cylinder according to any one of claims 1-9, and the self-pressurizing system (100) is connected between the fuel cell system and the liquid hydrogen cylinder (200).