Liquid hydrogen energy recovery system and vehicle

Abstract

The invention relates to a liquid hydrogen energy recovery system and a vehicle, the liquid hydrogen energy recovery system comprises a liquid hydrogen tank, a recovery tank, a control unit and a solid hydrogen storage module, the liquid hydrogen tank is provided with a first pressure sensor, the first pressure sensor monitors the pressure in the liquid hydrogen tank, and when the vehicle is in a static state, the solid hydrogen storage module is connected with the control unit; and the pressure in the liquid hydrogen tank is increased due to hydrogen generated by evaporation in the liquid hydrogen tank. When the pressure value monitored by the first pressure sensor exceeds a first preset value, the control unit controls the first electromagnetic valve to be opened, so that hydrogen enters the recovery tank and is absorbed by the solid hydrogen storage module, the hydrogen can be recovered, and waste caused by the fact that the hydrogen is discharged into the atmosphere is avoided. Moreover, when the vehicle is started, the solid hydrogen storage module is heated through the heating piece, so that the solid hydrogen storage module releases hydrogen, and the hydrogen flows into the electric pile from the recovery tank, so that the hydrogen is fully recycled, the energy waste is reduced, and the use cost of a user is greatly reduced.

Description

Technical Field

[0001] The present application relates to the technical field of vehicle liquid hydrogen systems, and in particular to a liquid hydrogen energy recovery system and a vehicle. Background Art

[0002] As a clean and efficient form of energy, hydrogen energy is regarded as an important alternative to traditional fuel in the field of transportation, which helps to reduce carbon emissions and promote environmental sustainability. Liquid hydrogen storage, as an innovative hydrogen energy storage and transportation solution, has the advantages of high hydrogen storage density and good safety performance, which can significantly increase the range of hydrogen energy vehicles. When in use, liquid hydrogen is converted into gaseous hydrogen through a vaporizer, and then the gaseous hydrogen is transmitted to the fuel cell stack for reaction, thereby providing energy for the vehicle.

[0003] However, when a hydrogen-powered vehicle is parked, the liquid hydrogen in the container storing liquid hydrogen will evaporate, causing the tank pressure to rise rapidly. When the safety valve discharge pressure value is reached, the safety valve opens and the evaporated hydrogen will be discharged into the atmosphere, resulting in a large amount of hydrogen waste. Summary of the invention

[0004] Based on this, it is necessary to provide a liquid hydrogen energy recovery system and vehicle for the problem that in the prior art, when a hydrogen-powered vehicle is parked, the liquid hydrogen in the container storing liquid hydrogen will evaporate, causing the tank pressure to rise rapidly. When the safety valve discharge pressure value is reached, the safety valve opens, and the evaporated hydrogen will be discharged into the atmosphere, resulting in a large amount of hydrogen waste.

[0005] In a first aspect, an embodiment of the present application provides a liquid hydrogen energy recovery system, the liquid hydrogen energy recovery system comprising:

[0006] A liquid hydrogen tank, the liquid hydrogen tank is used to store liquid hydrogen, and the liquid hydrogen tank is provided with a first pressure sensor;

[0007] A recovery tank, one end of which is connected to the liquid hydrogen tank, and the other end of which is connected to the fuel cell stack, and a first solenoid valve is provided between the recovery tank and the liquid hydrogen tank;

[0008] a control unit, wherein the control unit is capable of controlling the first solenoid valve to open or close according to the pressure in the liquid hydrogen tank monitored by the first pressure sensor;

[0009] A solid-state hydrogen storage module is disposed in the recovery tank, and the solid-state hydrogen storage module can absorb hydrogen. A heating element is also disposed in the recovery tank, and the heating element can heat the solid-state hydrogen storage module so that the solid-state hydrogen storage module releases the hydrogen to the fuel cell stack.

[0010] In one embodiment, a safety valve and a second pressure sensor are provided on the recovery tank, and both the safety valve and the second pressure sensor are electrically connected to the control unit. The control unit can control the safety valve to open or close according to the pressure in the recovery tank monitored by the second pressure sensor.

[0011] In one embodiment, the liquid hydrogen energy recovery system also includes a vaporizer, the liquid hydrogen tank is connected to the liquid inlet of the vaporizer, the gas outlet of the vaporizer is connected to the fuel cell stack, a second solenoid valve is arranged between the liquid hydrogen tank and the vaporizer, and the second solenoid valve is electrically connected to the control unit.

[0012] In one of the embodiments, a one-way valve is provided between the gas outlet of the vaporizer and the fuel cell stack.

[0013] In one embodiment, the liquid hydrogen energy recovery system also includes a hydrogen supply pipeline, which includes a hydrogen supply main pipe, a first hydrogen supply pipe and a second hydrogen supply pipe. One end of the hydrogen supply main pipe is connected to the air inlet of the fuel cell stack, and the hydrogen supply main pipe is connected to the recovery tank through the first hydrogen supply pipe, and the hydrogen supply main pipe is connected to the liquid hydrogen tank through the second hydrogen supply pipe.

[0014] In one embodiment, the first hydrogen supply pipe and the second hydrogen supply pipe are arranged in parallel.

[0015] In one of the embodiments, the liquid hydrogen energy recovery system further includes a pressure regulating valve, and the pressure regulating valve is arranged on the hydrogen supply main pipe.

[0016] In one of the embodiments, a temperature sensor and a hydrogen concentration sensor are also provided on the recovery tank, and both the temperature sensor and the hydrogen concentration sensor are electrically connected to the control unit.

[0017] In one of the embodiments, a third solenoid valve is provided between the recovery tank and the fuel cell stack, and the third solenoid valve is electrically connected to the control unit.

[0018] In a second aspect, an embodiment of the present application further provides a vehicle, comprising the above-mentioned liquid hydrogen energy recovery system, and also comprising a dashboard, wherein the dashboard is electrically connected to the control unit.

[0019] Beneficial effects:

[0020] The embodiment of the present application provides a liquid hydrogen energy recovery system and a vehicle. The liquid hydrogen energy recovery system includes a liquid hydrogen tank, a recovery tank, a control unit and a solid-state hydrogen storage module. The liquid hydrogen tank is provided with a first pressure sensor. The first pressure sensor monitors the pressure in the liquid hydrogen tank. When the vehicle is stationary, the hydrogen generated by evaporation inside the liquid hydrogen tank causes the pressure in the liquid hydrogen tank to increase. When the pressure value monitored by the first pressure sensor exceeds the first preset value, the control unit controls the first solenoid valve to open, so that hydrogen enters the recovery tank, and the hydrogen is absorbed by the solid-state hydrogen storage module, so that the hydrogen can be recovered, and the waste caused by hydrogen being discharged into the atmosphere is avoided. In addition, when the vehicle is started, the solid-state hydrogen storage module is heated by the heating element, so that the solid-state hydrogen storage module releases hydrogen, and the hydrogen flows from the recovery tank into the fuel cell stack, so as to fully reuse the hydrogen, reduce energy waste, and greatly reduce the user's use cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 A schematic structural diagram of a liquid hydrogen energy recovery system provided for some embodiments of the present application.

[0022] Reference numerals:

[0023] 1. Liquid hydrogen tank; 11. First pressure sensor; 12. First solenoid valve; 13. Second solenoid valve;

[0024] 2. Recovery tank; 21. Safety valve; 22. Second pressure sensor; 23. Temperature sensor; 24. Hydrogen concentration sensor; 25. Third solenoid valve;

[0025] 3. Control unit;

[0026] 4. Carburetor;

[0027] 5. Check valve;

[0028] 6. Hydrogen supply pipeline; 61. Hydrogen supply main pipe; 62. First hydrogen supply pipe; 63. Second hydrogen supply pipe;

[0029] 7. Pressure regulating valve;

[0030] 100. Battery stack;

[0031] 200. Dashboard. DETAILED DESCRIPTION

[0032] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0033] In the description of the present application, it should be understood that if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or position relationship indicated by these terms is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0034] In addition, if the terms "first" or "second" appear, these terms are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, if the term "plurality" appears, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0035] In this application, unless otherwise clearly specified and limited, if the terms "installed", "connected", "connected", "fixed" and the like appear, these terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; 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, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0036] In the present application, unless otherwise clearly specified and limited, if there is a description that a first feature is "above" or "below" a second feature, etc., or similar descriptions appear, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0037] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. If an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. If present, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are for illustrative purposes only and do not represent the only implementation method.

[0038] First, see Figure 1 An embodiment of the present application provides a liquid hydrogen energy recovery system, which includes a liquid hydrogen tank 1, a recovery tank 2, a control unit 3, a solid-state hydrogen storage module and a heating element.

[0039] The liquid hydrogen tank 1 is used to store liquid hydrogen. A first pressure sensor 11 is provided on the liquid hydrogen tank 1. The first pressure sensor 11 is used to detect the pressure in the liquid hydrogen tank 1. The inlet of the recovery tank 2 is connected to the liquid hydrogen tank 1 through a pipeline. The outlet of the recovery tank 2 is connected to the fuel cell stack 100 through a pipeline. A first solenoid valve 12 is provided on the pipeline between the recovery tank 2 and the liquid hydrogen tank 1.

[0040] The control unit 3 is used to receive the detection result of the first pressure sensor 11, and the control unit 3 can control the first solenoid valve 12 to open or close according to the detection result; the solid-state hydrogen storage module is arranged in the recovery tank 2, and the solid-state hydrogen storage module can absorb hydrogen; and the heating element is arranged in the recovery tank 2, and the heating element can heat the solid-state hydrogen storage module to make the solid-state hydrogen storage module release hydrogen. A liquid hydrogen energy recovery system provided by the embodiment of the present application, when the vehicle is stationary, the hydrogen generated by evaporation inside the liquid hydrogen tank 1 causes the pressure inside the liquid hydrogen tank 1 to increase. When the pressure value monitored by the first pressure sensor 11 exceeds the first preset value, the control unit 3 controls the first solenoid valve 12 to open, so that hydrogen enters the recovery tank 2, and the hydrogen is absorbed by the solid-state hydrogen storage module, so that the hydrogen can be recovered, and the waste of hydrogen is avoided. In addition, when the vehicle is started, the solid-state hydrogen storage module is heated by the heating element, so that the solid-state hydrogen storage module releases hydrogen, and the hydrogen flows from the recovery tank 2 into the stack 100, so as to fully reuse the hydrogen, reduce energy waste, and greatly reduce the user's use cost.

[0041] When the pressure value detected by the first pressure sensor 11 is less than the second preset pressure, the control unit 3 controls the first solenoid valve 12 to close.

[0042] The control unit 3 is, for example, a microprocessor, a PLC controller, a control circuit board, etc. The first preset value and the second preset value can be pre-stored in the control unit 3. The first preset value and the second preset value can be customized according to actual needs.

[0043] like Figure 1 As shown, in some embodiments, a safety valve 21 and a second pressure sensor 22 are provided on the recovery tank 2. The second pressure sensor 22 is used to detect the pressure in the recovery tank 2. The safety valve 21 and the second pressure sensor 22 are both electrically connected to the control unit 3. The control unit 3 can receive the detection result of the second pressure sensor 22 and control the safety valve 21 to open or close according to the detection result.

[0044] By arranging the second pressure sensor 22 on the recovery tank 2, the pressure in the recovery tank 2 can be monitored in real time, so that the user can observe the pressure value in real time to regulate the pressure in the recovery tank 2. In addition, by arranging the safety valve 21 on the recovery tank 2, when the pressure in the recovery tank 2 exceeds the pressure that the recovery tank 2 can withstand, the pressure can be released to avoid excessive pressure in the recovery tank 2, causing damage to the recovery tank 2 or the solid hydrogen storage module in the recovery tank 2. In addition, by electrically connecting the safety valve 21, the second pressure sensor 22 and the control unit 3, when the second pressure sensor 22 detects that the pressure value in the recovery tank 2 exceeds the preset pressure value, the control unit 3 can automatically control the safety valve 21 to open and exhaust the recovery tank 2, thereby further improving the safe use of the liquid hydrogen energy recovery system.

[0045] like Figure 1 As shown, in some embodiments, the liquid hydrogen energy recovery system also includes a vaporizer 4, the liquid hydrogen tank 1 is connected to the liquid inlet of the vaporizer 4, the gas outlet of the vaporizer 4 is connected to the fuel cell stack 100 through a pipeline, and a second solenoid valve 13 is arranged between the liquid hydrogen tank 1 and the vaporizer 4, the second solenoid valve 13 is electrically connected to the control unit 3, and the control unit 3 can control the second solenoid valve to open or close.

[0046] By setting up the vaporizer 4, when the amount of hydrogen in the recovery tank 2 is insufficient and the pressure value is insufficient, and hydrogen cannot be provided to the fuel cell stack 100, the second solenoid valve 13 between the liquid hydrogen tank 1 and the vaporizer 4 is opened, so that the liquid hydrogen in the liquid hydrogen tank 1 flows into the vaporizer 4, and the vaporizer 4 vaporizes the liquid hydrogen into hydrogen, thereby continuing to provide hydrogen to the fuel cell stack 100 and providing energy for the vehicle.

[0047] like Figure 1 As shown, in some embodiments, a one-way valve 5 is provided on the pipeline between the gas outlet of the vaporizer 4 and the fuel cell stack 100 .

[0048] By providing a one-way valve 5 between the gas outlet of the vaporizer 4 and the fuel cell stack 100 , hydrogen can only flow from the vaporizer 4 to the fuel cell stack 100 , thereby preventing hydrogen from flowing back from the fuel cell stack 100 to the vaporizer 4 and causing damage to the vaporizer 4 , thereby greatly extending the service life of the vaporizer 4 .

[0049] like Figure 1As shown, in some embodiments, the liquid hydrogen energy recovery system also includes a hydrogen supply pipeline 6, which includes a hydrogen supply main pipe 61, a first hydrogen supply pipe 62 and a second hydrogen supply pipe 63, one end of the first hydrogen supply pipe 62 is connected to the outlet of the recovery tank 2, and one end of the second hydrogen supply pipe 63 is connected to the liquid hydrogen tank 1; the other end of the first hydrogen supply pipe 62 and the other end of the second hydrogen supply pipe 63 are commonly connected to the input end of the hydrogen supply main pipe 61.

[0050] By setting up a hydrogen supply pipeline 6 and by connecting the first hydrogen supply pipe 62 and the second hydrogen supply pipe 63 in parallel to form a branch, on the one hand, the recovery tank 2 and the liquid hydrogen tank 1 can provide hydrogen to the fuel cell stack 100 without interference. On the other hand, when one of the recovery tank 2 and the liquid hydrogen tank 1 is damaged, the other can continue to provide hydrogen to the fuel cell stack 100, thereby ensuring the normal use of the vehicle and greatly improving the stability of the liquid hydrogen energy recovery system.

[0051] like Figure 1 As shown, in some embodiments, the liquid hydrogen energy recovery system further includes a pressure regulating valve 7 , and the pressure regulating valve 7 is disposed on the hydrogen supply main pipe 61 .

[0052] By providing a pressure-stabilizing valve 7 on the hydrogen supply main pipe 61, the pressure of hydrogen entering the fuel cell stack 100 can be controlled, so that the hydrogen entering the fuel cell stack 100 can be stably controlled to avoid damage to the fuel cell stack 100 caused by excessive hydrogen pressure, thereby greatly extending the service life of the fuel cell stack 100.

[0053] like Figure 1 As shown, in some embodiments, a temperature sensor 23 and a hydrogen concentration sensor 24 are also provided on the recovery tank 2. Both the temperature sensor 23 and the hydrogen concentration sensor 24 are electrically connected to the control unit 3. The control unit 3 is used to receive the detection results of the temperature sensor 23 and the hydrogen concentration sensor 24.

[0054] By arranging a temperature sensor 23 on the recovery tank 2 to detect the temperature inside the recovery tank 2, on the one hand, it can prevent the heating element from heating the solid-state hydrogen storage module and the hydrogen cannot be fully released due to the temperature being too low. On the other hand, it can prevent the heating element from heating the solid-state hydrogen storage module and the recovery tank 2 and the solid-state hydrogen storage module from being damaged due to the temperature being too high.

[0055] In addition, a hydrogen concentration sensor 24 is provided on the recovery tank 2 to detect the temperature inside the recovery tank 2. When the hydrogen concentration in the recovery tank 2 is insufficient and cannot provide hydrogen to the fuel cell stack 100, the control unit 3 can open the second solenoid valve 13 to allow liquid hydrogen to flow from the liquid hydrogen tank 1 to the vaporizer 4, and the liquid hydrogen is vaporized into hydrogen through the vaporizer 4, thereby providing hydrogen to the fuel cell stack 100.

[0056] like Figure 1As shown, in some embodiments, a third solenoid valve 25 is provided on the pipeline between the recovery tank 2 and the fuel cell stack 100, and the third solenoid valve 25 is electrically connected to the control unit 3. The control unit 3 can control the third solenoid valve 25 to open or close according to the detection results of the temperature sensor 23 and the detection results of the hydrogen concentration sensor 24.

[0057] By setting the third solenoid valve 25 between the recovery tank 2 and the fuel cell stack 100 , when the hydrogen concentration in the recovery tank 2 is insufficient and hydrogen cannot be provided to the fuel cell stack 100 , the control unit 3 controls the third solenoid valve 25 to disconnect the recovery tank 2 from the fuel cell stack 100 .

[0058] In the embodiment of the present application, the solid-state hydrogen storage module inside the recovery tank 2 is made of a solid-state hydrogen storage material, and the solid-state hydrogen storage material can be a chemical adsorption or physical adsorption material: the chemical adsorption material realizes hydrogen storage by generating hydrides through chemical bonds (metallic bonds, covalent bonds, coordination bonds, etc.), generally including magnesium alloys, rare earth alloys, titanium alloys, zirconium alloys, etc.; physical adsorption utilizes van der Waals forces to realize the adsorption of hydrogen on porous materials with a large surface area. During the adsorption process, hydrogen molecules do not break bonds and do not affect the purity of hydrogen. It has the characteristics of simple hydrogen storage process and easy dehydrogenation. Solid-state materials based on physical adsorption mainly include carbon-based materials and metal-organic framework materials.

[0059] In the embodiment of the present application, the recovery tank 2 and the liquid hydrogen tank 1 are made of steel and aluminum materials, and the outer wall thickness can be adjusted according to actual needs.

[0060] In the embodiment of the present application, the heating element can adopt electric heating, water heating, and air preheating.

[0061] Working principle of liquid hydrogen energy recovery system:

[0062] When the vehicle is stationary, the liquid hydrogen in the liquid hydrogen tank 1 will evaporate into hydrogen at room temperature. The pressure in the liquid hydrogen tank 1 is monitored by a first pressure sensor 11 arranged on the liquid hydrogen tank 1. When the pressure in the liquid hydrogen tank 1 reaches the set pressure, the control unit 3 sends a signal to open the first solenoid valve 12 to discharge the evaporated hydrogen into the recovery tank 2. At this time, the discharged hydrogen is high pressure and low temperature, and the solid hydrogen storage module in the recovery tank 2 absorbs a large amount of hydrogen. When the pressure of the liquid hydrogen tank 1 is lower than the set pressure or the pressure in the recovery tank 2 reaches the set pressure, the control unit 3 sends a signal to close the first solenoid valve 12.

[0063] When the vehicle is to be started, the control unit 3 sends a signal to heat the recovery tank 2 through the heating element. After the recovery tank 2 reaches the set temperature, the solid hydrogen storage module will release hydrogen. After the pressure in the recovery tank 2 reaches the set value, the control unit 3 opens the second solenoid valve 13, and the hydrogen flows to the fuel cell stack 100 and flows through the pressure regulating valve 7 to supply stable hydrogen to the fuel cell stack 100 for use.

[0064] During vehicle driving, when the pressure in the recovery tank 2 is lower than the set pressure, the control unit 3 closes the second solenoid valve 13 and opens the third solenoid valve 25, so that the low-temperature liquid hydrogen in the liquid hydrogen tank 1 is heated by the vaporizer 4 to become hydrogen, which flows through the one-way valve 5 and the pressure regulating valve 7 and is supplied to the fuel cell stack 100 for use.

[0065] On the second aspect, an embodiment of the present application further provides a vehicle, comprising the above-mentioned liquid hydrogen energy recovery system, and also comprising a dashboard 200 , wherein the dashboard 200 is electrically connected to the control unit 3 .

[0066] In the embodiment of the present application, the control unit 3 can display the detection data of the first pressure sensor 11, the second pressure sensor 22, the temperature sensor 23, and the hydrogen concentration sensor 24 connected thereto in real time on the instrument panel 200, so that the user can observe the real-time status of the liquid hydrogen energy recovery system and control the liquid hydrogen energy recovery system.

[0067] In addition, when the first solenoid valve 12, the second solenoid valve 13 and the third solenoid valve 25 fail, the fault will be fed back to the control unit 3, and a yellow light will be turned on to warn on the instrument panel 200. When the hydrogen leakage in the recovery tank 2 exceeds the set concentration, the hydrogen concentration sensor 24 will feed back to the control unit 3, and a red light will be turned on to warn on the instrument panel 200.

[0068] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0069] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.

Claims

1. Liquid hydrogen energy recovery system, characterized in that: The liquid hydrogen energy recovery system comprises: A liquid hydrogen tank, wherein a first pressure sensor is provided on the liquid hydrogen tank, and the first pressure sensor is used to detect the pressure in the liquid hydrogen tank; A recovery tank, wherein the inlet of the recovery tank is connected to the liquid hydrogen tank through a pipeline, the outlet of the recovery tank is connected to the fuel cell stack through a pipeline, and a first solenoid valve is provided on the pipeline between the recovery tank and the liquid hydrogen tank; a control unit, the control unit being used to receive a detection result of the first pressure sensor, and the control unit being capable of controlling the first solenoid valve to open or close according to the detection result; A solid-state hydrogen storage module, the solid-state hydrogen storage module is disposed in the recovery tank, and the solid-state hydrogen storage module is capable of absorbing hydrogen; and A heating element is disposed in the recovery tank, and the heating element can heat the solid-state hydrogen storage module so that the solid-state hydrogen storage module releases the hydrogen.

2. The liquid hydrogen energy recovery system according to claim 1, characterized in that: The recovery tank is provided with a safety valve and a second pressure sensor, the second pressure sensor is used to detect the pressure in the recovery tank, the safety valve and the second pressure sensor are both electrically connected to the control unit, the control unit can receive the detection result of the second pressure sensor, and control the safety valve to open or close according to the detection result.

3. The liquid hydrogen energy recovery system according to claim 1, characterized in that: The liquid hydrogen energy recovery system also includes a vaporizer, the liquid hydrogen tank is connected to the liquid inlet of the vaporizer, and the gas outlet of the vaporizer is connected to the fuel cell stack through a pipeline; a second solenoid valve is arranged between the liquid hydrogen tank and the vaporizer, and the second solenoid valve is electrically connected to the control unit, and the control unit can control the second solenoid valve to open or close.

4. The liquid hydrogen energy recovery system according to claim 3, characterized in that: A one-way valve is arranged on the pipeline between the gas outlet of the vaporizer and the fuel cell stack.

5. The liquid hydrogen energy recovery system according to claim 1, characterized in that: The liquid hydrogen energy recovery system further includes a hydrogen supply pipeline, which includes a hydrogen supply main pipe, a first hydrogen supply pipe and a second hydrogen supply pipe; One end of the first hydrogen supply pipe is connected to the outlet of the recovery tank, and one end of the second hydrogen supply pipe is connected to the liquid hydrogen tank; the other end of the first hydrogen supply pipe and the other end of the second hydrogen supply pipe are commonly connected to the input end of the hydrogen supply main pipe.

6. The liquid hydrogen energy recovery system according to claim 5, characterized in that: The liquid hydrogen energy recovery system further comprises a pressure stabilizing valve, which is arranged on the hydrogen supply main pipe.

7. The liquid hydrogen energy recovery system according to claim 1, characterized in that: The recovery tank is also provided with a temperature sensor and a hydrogen concentration sensor, both of which are electrically connected to the control unit, and the control unit is used to receive the detection results x of the temperature sensor and the hydrogen concentration sensor.

8. The liquid hydrogen energy recovery system according to claim 7, characterized in that: A third solenoid valve is provided on the pipeline between the recovery tank and the fuel cell stack. The third solenoid valve is electrically connected to the control unit. The control unit can control the third solenoid valve to open or close according to the detection results of the temperature sensor and the detection results of the hydrogen concentration sensor.

9. The liquid hydrogen energy recovery system according to claim 1, characterized in that: The solid-state hydrogen storage module is made of solid-state hydrogen storage material.

10. A vehicle, characterized in that It comprises the liquid hydrogen energy recovery system as described in any one of claims 1 to 9, and also comprises a dashboard, wherein the dashboard is electrically connected to the control unit.

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