Liquid hydrogen fuel cell system, vehicle, and control method of liquid hydrogen fuel cell system

Abstract

The invention relates to a liquid hydrogen fuel cell system, a vehicle and a control method of the liquid hydrogen fuel cell system.The liquid hydrogen fuel cell system comprises a hydrogen storage device, an air bath vaporizer, a water bath vaporizer, a hydrogen supply device and a fuel cell engine which are sequentially communicated, and the fuel cell system further comprises a hydrogen evaporation gas recycling pipeline; one end of the hydrogen boil-off gas recovery pipeline is connected with the hydrogen storage device, the other end of the hydrogen boil-off gas recovery pipeline is located between the output end of the air bath vaporizer and the input end of the water bath vaporizer, and a storage tank is arranged on the hydrogen boil-off gas recovery pipeline. Therefore, after the fuel cell engine is started next time, the hydrogen stored in the storage tank can be used for providing the hydrogen flow necessary for starting for the liquid hydrogen fuel cell system, so that the influence caused by the fact that high-temperature cooling liquid circulating in the whole vehicle cannot provide a heat source for the water bath vaporizer in time due to the low environment temperature is reduced; the vehicle starting speed is increased.

Description

Technical Field

[0001] The present disclosure relates to the field of fuel cell technology, and in particular, to a liquid hydrogen fuel cell system, a vehicle, and a control method for the liquid hydrogen fuel cell system. Background Art

[0002] In the field of new energy vehicles, fuel cell electric vehicles have become cutting-edge technology. However, for long-distance trunk applications, driving range remains a major challenge for new energy heavy-duty trucks. Low-temperature liquid hydrogen, with its high density, low safety pressure, and large hydrogen storage capacity, addresses the limitations of gas-hydrogen fuel cell vehicles in terms of long driving range.

[0003] When the ambient temperature is low and the fuel cell is started for the first time after driving, due to the low temperature, the entire vehicle may not be able to provide the water bath vaporizer with high-temperature coolant in time. This will cause the liquid hydrogen system to convert liquid hydrogen into gaseous hydrogen more slowly, resulting in insufficient hydrogen supply pressure in the liquid hydrogen system, and the inability to provide the fuel cell with the hydrogen pressure and flow required for startup in time, thus preventing the vehicle from starting normally. Summary of the Invention

[0004] An object of the present disclosure is to provide a liquid hydrogen fuel cell system, a vehicle, and a control method for the liquid hydrogen fuel cell system, so as to at least partially solve the problems existing in the related art.

[0005] To achieve the above-mentioned objectives, the present disclosure provides a liquid hydrogen fuel cell system, which includes a hydrogen storage device, an air bath vaporizer, a water bath vaporizer, a hydrogen supply device, and a fuel cell engine connected in sequence. The liquid hydrogen fuel cell system also includes a hydrogen evaporated gas recovery pipeline, one end of which is connected to the hydrogen storage device, and the other end is connected between the output end of the air bath vaporizer and the input end of the water bath vaporizer. A storage tank is provided on the hydrogen evaporated gas recovery pipeline.

[0006] Optionally, a one-way valve is connected to the hydrogen evaporated gas recovery pipeline between the storage tank and the input end of the hydrogen supply device, so as to only allow hydrogen to flow from the storage tank to the hydrogen supply device.

[0007] Optionally, a first solenoid valve is provided between the hydrogen storage device and the air bath vaporizer, a second solenoid valve is connected to the output end of the hydrogen supply device, a third solenoid valve is connected to the hydrogen evaporated gas recovery pipeline between the storage tank and the hydrogen storage device, and a fourth solenoid valve is connected to the hydrogen evaporated gas recovery pipeline between the storage tank and the input end of the hydrogen supply device.

[0008] Optionally, the hydrogen storage device is connected to a first safety valve, the storage tank is connected to a second safety valve, and the output end of the hydrogen supply device is further connected to a pressure stabilizing valve.

[0009] According to a second aspect of the present disclosure, a vehicle is provided, characterized in that it includes the above-mentioned liquid hydrogen fuel cell system.

[0010] According to a third aspect of the present disclosure, a control method for a liquid hydrogen fuel cell system is provided. The control method uses the above-mentioned liquid hydrogen fuel cell system. When the liquid hydrogen fuel cell system is shut down, the control method includes: Controlling the hydrogen storage device to be disconnected from the air bath vaporizer; Get the ambient temperature T 环境 ; When the ambient temperature T 环境 Less than or equal to the temperature threshold T 阈 When the hydrogen storage device is connected to the storage tank, the storage tank is controlled to be disconnected from the hydrogen supply device; After the interval time t, the fuel cell engine is controlled to be shut down.

[0011] Optionally, in the step of obtaining the ambient temperature T 环境 After the step, the control method includes: When the ambient temperature T 环境 Greater than the temperature threshold T 阈 When the hydrogen storage tank is connected to the hydrogen supply device and disconnected from the hydrogen storage device; After the interval time t, the fuel cell engine is controlled to shut down; The storage tank is controlled to be connected to the hydrogen storage device and disconnected from the hydrogen supply device.

[0012] Optionally, the control method includes: Obtain the pressure value P of the hydrogen storage device 储氢装置 ; When the pressure value P of the hydrogen storage device 储氢装置 Greater than the pressure threshold P 阈 When the hydrogen storage device is connected to the storage tank,

[0013] Optionally, when the liquid hydrogen fuel cell system is operating, the control method includes: Get the ambient temperature T 环境 ; When the ambient temperature T 环境 Less than or equal to the temperature threshold T 阈 When the hydrogen storage tank is connected to the hydrogen supply device,

[0014] Optionally, when the liquid hydrogen fuel cell system is operating, the control method includes: Obtain the pressure value P of the hydrogen supply device 供氢装置 and the pressure value P of the storage tank储罐 ; If P 供氢装置 <P 储罐 , control the hydrogen supply device to be connected to the storage tank.

[0015] Through the above technical solution, a storage tank connected to a hydrogen storage device is connected between the air bath vaporizer and the water bath vaporizer. When the ambient temperature is low and the fuel cell engine needs to be shut down, the hydrogen in the hydrogen supply device can be consumed, and the hydrogen in the storage tank can be stored at the same time. In this way, after the next fuel cell engine is started, since the storage tank contains the hydrogen that was not consumed before the last stop and the hydrogen generated by the hydrogen storage device during the parking of the vehicle, the hydrogen stored in the storage tank can be used to provide the liquid hydrogen fuel cell system with the necessary hydrogen flow when starting. Since the stored hydrogen in the storage tank is close to the ambient temperature and the storage tank is connected between the air bath vaporizer and the water bath vaporizer, compared to only accepting hydrogen below the ambient temperature input from the air bath vaporizer, the hydrogen in the storage tank close to the ambient temperature is input into the water bath vaporizer. This can reduce the impact of the high-temperature coolant circulating in the vehicle being unable to provide a heat source for the water bath vaporizer in time due to the low ambient temperature, thereby improving the vehicle starting speed.

[0016] Other features and advantages of the present disclosure will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings are used to provide a further understanding of the present disclosure and constitute a part of the specification. Together with the following detailed description, they are used to explain the present disclosure but do not constitute a limitation of the present disclosure. In the accompanying drawings: Figure 1 is a schematic diagram of a hydrogen boil-off gas recovery and processing system provided by an exemplary embodiment of the present disclosure; Figure 2 FIG. 4 is a flowchart of a liquid hydrogen fuel cell system according to an exemplary embodiment of the present disclosure.

[0018] Description of Reference Numerals 10-hydrogen evaporated gas recovery pipeline; 1-hydrogen storage device; 2-air bath vaporizer; 3-hydrogen supply device; 4-storage tank; 5-water bath vaporizer; 51-temperature sensor; 6-check valve; 71-first solenoid valve; 72-second solenoid valve; 73-third solenoid valve; 74-fourth solenoid valve; 81-first safety valve; 82-second safety valve; 9-pressure regulating valve DETAILED DESCRIPTION The following describes the specific embodiments of the present disclosure in detail with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only used to illustrate and explain the present disclosure and are not intended to limit the present disclosure.

[0019] In this disclosure, unless otherwise specified, the terms "inner" and "outer" refer to the outlines of the corresponding components themselves. Terms such as "first" and "second" are used in this disclosure to distinguish one element from another and do not imply order or importance. In this disclosure, when the following description refers to the accompanying drawings, unless otherwise indicated, identical numerals in different drawings represent identical or similar elements.

[0020] Because the hydrogen in hydrogen storage device 1 is liquid and has a temperature of approximately -256 degrees Celsius, the temperature of the hydrogen after passing through air bath vaporizer 2 is also lower than the ambient temperature, requiring treatment in water bath vaporizer 5 to reach the temperature required for fuel cell engine startup. Due to the lower ambient temperatures in winter, when a vehicle is started in winter, the high-temperature coolant circulating throughout the vehicle is unable to provide a timely heat source for the water bath vaporizer 5 of the liquid hydrogen fuel cell system. Consequently, the liquid hydrogen fuel cell system can only rely on the hydrogen in air bath vaporizer 2 and hydrogen supply device 3 to provide the necessary hydrogen flow for fuel cell engine startup, which limits the vehicle's startup speed.

[0021] According to one embodiment of the present disclosure, a liquid hydrogen fuel cell system is provided, referring to Figure 1 、 Figure 2 The liquid hydrogen fuel cell system includes a hydrogen storage device 1, an air bath vaporizer 2, a water bath vaporizer 5, a hydrogen supply device 3, and a fuel cell engine, which are connected in sequence. The liquid hydrogen fuel cell system also includes a hydrogen evaporated gas recovery line 10. One end of the hydrogen evaporated gas recovery line 10 is connected to the hydrogen storage device 1, and the other end is connected between the output end of the air bath vaporizer 2 and the input end of the water bath vaporizer 5. A storage tank 4 is provided on the hydrogen evaporated gas recovery line 10. It should be noted that the storage tank 4 can be a BOG storage tank.

[0022] Through the above technical solution, a storage tank 4 connected to the hydrogen storage device 1 is connected between the air bath vaporizer 2 and the water bath vaporizer 5. When the ambient temperature is low and the fuel cell engine needs to be shut down, the hydrogen in the hydrogen supply device 3 can be consumed, while the hydrogen in the storage tank 4 is stored. In this way, after the next fuel cell engine is started, because the storage tank 4 contains the hydrogen that was not consumed before the last shutdown and the hydrogen generated by the hydrogen storage device 1 during the vehicle's parking, the hydrogen stored in the storage tank 4 can be used to provide the necessary hydrogen flow for starting the liquid hydrogen fuel cell system. Because the hydrogen stored in the storage tank 4 is close to the ambient temperature and the storage tank 4 is connected between the air bath vaporizer 2 and the water bath vaporizer 5, compared to only receiving hydrogen at a temperature lower than the ambient temperature input from the air bath vaporizer 2, the hydrogen in the storage tank 4 near the ambient temperature is directly input into the water bath vaporizer 5. This can reduce the impact caused by the high-temperature coolant circulating in the entire vehicle being unable to provide a heat source for the water bath vaporizer 5 in a timely manner due to the low ambient temperature, thereby improving the vehicle's starting speed.

[0023] Here, the function of the water bath vaporizer 5 is to heat the low-temperature hydrogen gas, which flows out of the air bath vaporizer 2, into the water bath vaporizer 5, where it can be further heated to the hydrogen temperature required by the fuel cell engine. The hydrogen gas in the storage tank can directly enter the water bath vaporizer 5 to be further heated to the hydrogen temperature required by the fuel cell engine. The water bath vaporizer 5 can have a water inlet and a water outlet, and temperature sensors 51 can be installed at the water inlet and outlet, respectively. The temperature sensors 51 are used to detect the temperature of the water inlet and outlet of the water bath vaporizer 5, so as to monitor the working condition of the water bath vaporizer 5 in real time.

[0024] It should be noted that, referring to Figure 1 A one-way valve 6 may also be connected to the hydrogen evaporated gas recovery line 10 between the storage tank 4 and the input end of the hydrogen supply device 3 to allow hydrogen to flow only from the storage tank 4 to the hydrogen supply device 3. The one-way valve 6 can limit the flow direction of the hydrogen, preventing hydrogen from the hydrogen supply device 3 or the water bath vaporizer 5 from flowing back into the storage tank 4.

[0025] According to one embodiment of the present disclosure, referring to Figure 1 、 Figure 2 A first solenoid valve 71 may be provided between the hydrogen storage device 1 and the air bath vaporizer 2, a second solenoid valve 72 may be connected to the output end of the hydrogen supply device 3, a third solenoid valve 73 may be connected to the hydrogen evaporated gas recovery pipeline 10 between the storage tank 4 and the hydrogen storage device 1, and a fourth solenoid valve 74 may be connected to the hydrogen evaporated gas recovery pipeline 10 between the storage tank 4 and the input end of the hydrogen supply device 3.

[0026] Further, refer to Figure 1 The hydrogen storage device 1 may be connected to a first safety valve 81. The first safety valve 81 provides safety protection within the system. When the pressure of the gaseous hydrogen in the hydrogen storage device 1 exceeds the specified value after entering the storage tank 4, the first safety valve 81 opens, discharging some of the evaporated hydrogen from the hydrogen storage device 1 into the atmosphere. This keeps the pressure in the hydrogen storage device 1 below the permitted value, thereby preventing accidents caused by excessive pressure.

[0027] Further, refer to Figure 1 A second safety valve 82 may be connected to the storage tank 4. This second safety valve 82 provides safety protection within the system. When the pressure in the storage tank 4 still exceeds the specified value, the second safety valve 82 opens, discharging some of the gaseous hydrogen in the storage tank 4 into the atmosphere, keeping the pressure in the storage tank 4 below the permitted value and preventing accidents caused by excessive pressure.

[0028] In some embodiments, reference Figure 1 The output end of the hydrogen supply device 3 can also be connected to a pressure-stabilizing valve 9, which can ensure that the hydrogen entering the fuel cell engine has a stable pressure.

[0029] According to a second aspect of the present disclosure, a vehicle is further provided, comprising the liquid hydrogen fuel cell system described above. The vehicle has all the beneficial effects of the liquid hydrogen fuel cell system described above, which will not be further elaborated here.

[0030] According to a third aspect of the present disclosure, a control method for a liquid hydrogen fuel cell system is provided. The control method uses the above-mentioned liquid hydrogen fuel cell system. When the liquid hydrogen fuel cell system is shut down, the control method includes the following steps: first, controlling the hydrogen storage device 1 to be disconnected from the air bath vaporizer 2 to ensure that the hydrogen storage device 1 no longer directly supplies hydrogen to the fuel cell engine. At this time, the ambient temperature T is obtained. 环境 , when the ambient temperature T 环境 Less than or equal to the temperature threshold T 阈 When the ambient temperature is low, the hydrogen evaporated gas recovery and processing system adopts the winter operation mode, which can control the connection between the storage tank 4 and the hydrogen storage device 1 and disconnect the storage tank 4 from the hydrogen supply device 3. In this way, the hydrogen in the hydrogen supply device 3 can be consumed by the fuel cell engine while the hydrogen in the storage tank 4 is stored. It should be noted that the temperature threshold T 阈 It can be set to 0°C, or to other temperatures as needed, and this disclosure does not limit this. After the interval time t, the fuel cell engine is controlled to shut down. Here, the interval time t can be determined based on the remaining hydrogen in the hydrogen supply device 3. If the remaining hydrogen in the hydrogen supply device 3 is large, the interval time t requires a longer time to ensure that the hydrogen in the hydrogen supply device 3 is fully burned. If the remaining hydrogen in the hydrogen supply device 3 is small, the interval time t requires a shorter time to fully burn the hydrogen in the hydrogen supply device 3, thereby ensuring the safety of the system. This is not limited in this disclosure. In this way, when the ambient temperature is low and the fuel cell engine needs to be shut down, the hydrogen in the hydrogen supply device 3 is consumed, and the hydrogen in the storage tank 4 is stored. After the next fuel cell engine is started, the hydrogen stored in the storage tank 4 can be used to provide the liquid hydrogen fuel cell system with the necessary hydrogen flow rate for startup, reducing the impact of the high-temperature coolant circulating in the vehicle being unable to provide a heat source for the water bath vaporizer 5 in time due to the low ambient temperature, thereby improving the vehicle startup speed.

[0031] Further, refer to Figure 1 A first solenoid valve 71 may be provided between the hydrogen storage device 1 and the air bath vaporizer 2. In the step of controlling the disconnection of the hydrogen storage device 1 and the air bath vaporizer 2, the connection between the hydrogen storage device 1 and the air bath vaporizer 2 may be disconnected by controlling the first solenoid valve 71 to be closed, so that the hydrogen storage device 1 no longer directly supplies hydrogen to the fuel cell engine.

[0032] In some embodiments, when obtaining the ambient temperature T 环境 After the step, when the ambient temperature T 环境 Greater than the temperature threshold T 阈When the ambient temperature is high, the hydrogen evaporated gas recovery and processing system adopts the summer operation mode, which can control the storage tank 4 to be connected to the hydrogen supply device 3 and disconnected from the hydrogen storage device 1. After the interval time t, the fuel cell engine is controlled to shut down, so that the hydrogen in the hydrogen supply device 3 and the storage tank 4 can be consumed at the same time. Due to the high ambient temperature in summer, the liquid hydrogen in the hydrogen storage device 1 evaporates faster than in winter. Therefore, before the fuel cell is shut down, the gas in the storage tank 4 must be consumed as much as possible to reduce the pressure in the storage tank 4. The interval time t can be determined based on the remaining hydrogen in the hydrogen supply device 3 and the storage tank 4. If the remaining hydrogen in the hydrogen supply device 3 and the storage tank 4 is large, the interval time t needs to be longer to ensure that the hydrogen in the hydrogen supply device 3 and the storage tank 4 is fully burned. If the remaining hydrogen in the hydrogen supply device 3 and the storage tank 4 is small, the interval time t needs to be shorter to fully burn the hydrogen in the hydrogen supply device 3 and the storage tank 4, thereby ensuring system safety. After the fuel cell engine is shut down, the storage tank 4 is controlled to be connected to the hydrogen storage device 1 and disconnected from the hydrogen supply device 3. In this way, when the vehicle is parked, the storage tank 4 can store more hydrogen generated by static evaporation, reducing resource waste.

[0033] Furthermore, in the step of controlling the storage tank 4 to be connected to the hydrogen supply device 3 and disconnected from the hydrogen storage device 1, the storage tank 4 can be connected to the hydrogen supply device 3 and disconnected from the hydrogen storage device 1 by controlling the third solenoid valve 73 to be closed and the fourth solenoid valve 74 to be opened.

[0034] Similarly, in the step of controlling the storage tank 4 to be connected to the hydrogen storage device 1 and disconnected from the hydrogen supply device 3, the storage tank 4 can also be connected to the hydrogen storage device 1 and disconnected from the hydrogen supply device 3 by controlling the third solenoid valve 73 to open and the fourth solenoid valve 74 to close.

[0035] In some embodiments, the pressure value P of the hydrogen storage device 1 can be obtained 储氢装置 , when the pressure value P of the hydrogen storage device 1 储氢装置 Greater than the pressure threshold P 阈 When the hydrogen storage device 1 is connected to the storage tank 4, the gas is temporarily stored to reduce the potential safety hazards caused by the excessive pressure value of the hydrogen storage device 1 and improve the safety of the liquid hydrogen fuel cell system.

[0036] Further, refer to Figure 1 The output end of the hydrogen supply device 3 can be connected to a second solenoid valve 72. In the step of controlling the connection between the hydrogen storage device 1 and the fuel cell engine, the connection between the hydrogen storage device 1 and the fuel cell engine can be controlled by controlling the second solenoid valve 72 to be opened, so that the hydrogen storage device 1 can provide hydrogen to the fuel cell engine through the hydrogen supply device 3.

[0037] In some embodiments, when the liquid hydrogen fuel cell system is working, the control method includes the following steps: first, obtaining the ambient temperature T 环境 , when the ambient temperature T 环境 Less than or equal to the temperature threshold T 阈 When the fuel cell engine is started at a low ambient temperature, the hydrogen in the storage tank 4 can provide the liquid hydrogen fuel cell system with the necessary hydrogen flow rate for starting, thereby increasing the vehicle starting speed.

[0038] In some embodiments, reference Figure 1 、 Figure 2 When the liquid hydrogen fuel cell system is working, the pressure value P of the hydrogen supply device 3 can be obtained. 供氢装置 and the pressure value P of tank 4 储罐 , if P 供氢装置 <P 储罐 , control the hydrogen supply device 3 to be connected with the storage tank 4 to provide hydrogen with stable pressure and flow for the fuel cell.

[0039] The working process of the hydrogen evaporated gas recovery and treatment system is as follows: after the fuel cell engine is started, the first solenoid valve 71 and the second solenoid valve 72 are opened, and liquid hydrogen flows out of the hydrogen storage device 1, is vaporized by the air bath vaporizer 2 and the water bath vaporizer 5, and then passes through the hydrogen supply device 3 to be used by the fuel cell engine system. The hydrogen not used by the fuel cell engine system is stored in the hydrogen supply device 3; when the pressure value P in the hydrogen storage device 1 is 储氢装置 Higher than the rated working pressure of the hydrogen storage device 1, that is, the pressure threshold P 阈 When the third solenoid valve 73 is opened, the hydrogen in the hydrogen storage device 1 is discharged into the storage tank 4 to temporarily store the gas; when the liquid hydrogen fuel cell system is working, when P 供氢装置 <P 储罐 When the fourth solenoid valve 74 is opened, the hydrogen in the storage tank 4 enters the hydrogen supply device 3 through the water bath vaporizer 5, providing hydrogen with stable pressure and flow for the fuel cell.

[0040] The preferred embodiments of the present disclosure are described in detail above in conjunction with the accompanying drawings. However, the present disclosure is not limited to the specific details of the above embodiments. Within the technical concept of the present disclosure, various simple modifications can be made to the technical solutions of the present disclosure, and these simple modifications all fall within the scope of protection of the present disclosure.

[0041] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any appropriate manner without contradiction. In order to avoid unnecessary repetition, the present disclosure will not further describe various possible combinations.

[0042] In addition, the various embodiments of the present disclosure may be arbitrarily combined, and as long as they do not violate the concept of the present disclosure, they should also be regarded as the contents disclosed by the present disclosure.

Claims

1. A liquid hydrogen fuel cell system, characterized in that: The liquid hydrogen fuel cell system includes a hydrogen storage device, an air bath vaporizer, a water bath vaporizer, a hydrogen supply device and a fuel cell engine connected in sequence. The liquid hydrogen fuel cell system also includes a hydrogen evaporated gas recovery pipeline, one end of which is connected to the hydrogen storage device, and the other end is connected between the output end of the air bath vaporizer and the input end of the water bath vaporizer. A storage tank is provided on the hydrogen evaporated gas recovery pipeline.

2. The liquid hydrogen fuel cell system according to claim 1, characterized in that: A one-way valve is connected to the hydrogen evaporated gas recovery pipeline between the storage tank and the input end of the hydrogen supply device, which only allows hydrogen to flow from the storage tank to the hydrogen supply device.

3. The liquid hydrogen fuel cell system according to claim 1, characterized in that: A first solenoid valve is provided between the hydrogen storage device and the air bath vaporizer, a second solenoid valve is connected to the output end of the hydrogen supply device, a third solenoid valve is connected to the hydrogen evaporated gas recovery pipeline between the storage tank and the hydrogen storage device, and a fourth solenoid valve is connected to the hydrogen evaporated gas recovery pipeline between the storage tank and the input end of the hydrogen supply device.

4. The liquid hydrogen fuel cell system according to claim 1, characterized in that: The hydrogen storage device is connected to a first safety valve, the storage tank is connected to a second safety valve, and the output end of the hydrogen supply device is also connected to a pressure stabilizing valve.

5. A vehicle, characterized in that: A liquid hydrogen fuel cell system comprising the liquid hydrogen fuel cell system according to any one of claims 1 to 4.

6. A control method for a liquid hydrogen fuel cell system, characterized in that: The control method uses the liquid hydrogen fuel cell system according to any one of claims 1 to 4. When the liquid hydrogen fuel cell system is shut down, the control method includes: Controlling the hydrogen storage device to be disconnected from the air bath vaporizer; Get the ambient temperature T 环境 ; When the ambient temperature T 环境 Less than or equal to the temperature threshold T 阈 When the hydrogen storage device is connected to the storage tank, the storage tank is controlled to be disconnected from the hydrogen supply device; After the interval time t, the fuel cell engine is controlled to be shut down.

7. The control method of the liquid hydrogen fuel cell system according to claim 6, characterized in that: In the acquisition of the ambient temperature T 环境 After the step, the control method includes: When the ambient temperature T 环境 Greater than the temperature threshold T 阈 When the hydrogen storage tank is connected to the hydrogen supply device and disconnected from the hydrogen storage device; After the interval time t, the fuel cell engine is controlled to shut down; The storage tank is controlled to be connected to the hydrogen storage device and disconnected from the hydrogen supply device.

8. The control method of the liquid hydrogen fuel cell system according to claim 6, characterized in that: The control method includes: Obtain the pressure value P of the hydrogen storage device 储氢装置 ; When the pressure value P of the hydrogen storage device 储氢装置 Greater than the pressure threshold P 阈 When the hydrogen storage device is connected to the storage tank, 9. The control method of the liquid hydrogen fuel cell system according to claim 6, characterized in that: When the liquid hydrogen fuel cell system is operating, the control method includes: Get the ambient temperature T 环境 ; When the ambient temperature T 环境 Less than or equal to the temperature threshold T 阈 When the hydrogen storage tank is connected to the hydrogen supply device, 10. The control method of the liquid hydrogen fuel cell system according to claim 6, characterized in that: When the liquid hydrogen fuel cell system is operating, the control method includes: Obtain the pressure value P of the hydrogen supply device 供氢装置 and the pressure value P of the storage tank 储罐 ; If P 供氢装置 <P 储罐 , control the hydrogen supply device to be connected to the storage tank.

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