Hydrogen fuel cell hydrogen storage and supply system and cell low-temperature starting method

Abstract

The invention discloses a hydrogen fuel cell hydrogen storage and gas supply system and a cell low-temperature starting method.The hydrogen fuel cell hydrogen storage and gas supply system comprises a fuel cell, the fuel cell is connected with a first gas supply pipeline and a second gas supply pipeline, the first gas supply pipeline is connected with the second gas supply pipeline, and the first gas supply pipeline comprises a solid hydrogen storage bottle; the first gas supply pipeline comprises a gas-state hydrogen storage bottle, a first bottle opening electromagnetic valve is arranged on the first gas supply pipeline, the second gas supply pipeline comprises a gas-state hydrogen storage bottle, and a second bottle opening electromagnetic valve is arranged on the second gas supply pipeline. The starting process of the hydrogen fuel cell in a low-temperature environment is met, and the application cost of additional heating components is saved.

Description

Technical Field

[0001] The present invention belongs to the field of hydrogen fuel cells. Specifically, the present invention relates to a hydrogen storage and supply system for a hydrogen fuel cell and a method for low-temperature startup of the battery. Background Art

[0002] Solid hydrogen storage has become a hot spot in the layout of the hydrogen energy industry due to its advantages such as high volume density and high safety. The release of hydrogen in a solid hydrogen storage system requires heat absorption and is within a certain temperature range. At temperatures below freezing point, the solid hydrogen storage cylinder cannot release hydrogen normally. The difficulty in low-temperature startup lies in that water in the membrane electrode freezes at low temperatures. A part of the water generated after the reaction on the cathode side remains in the stack and freezes below the freezing point. These freezing phenomena will cause the volume of the proton exchange membrane to expand, and the heat generated after the battery starts will melt this ice into water, and the volume will decrease again. This repeated phase change will have a great impact on the battery material structure, battery performance and lifespan. Especially in an extremely low environment, the engine system may experience problems such as slow startup, inability to start, or startup failure. Due to the formation of ice and repeated freeze / thaw cycles, the performance of individual fuel cells inside may decline, even leading to irreversible damage.

[0003] Normally, in a low-temperature environment, the solid hydrogen storage cylinder needs to be heated to release hydrogen normally. Currently, the heating methods for low-temperature startup of fuel cells mainly fall into two categories, namely external heating methods and internal heating methods. Although the above two methods can meet the requirements of low-temperature cold startup to a certain extent, they require additional external heating equipment and increase costs, and it is difficult to ensure a continuous supply of stable hydrogen, unable to meet the requirement of outputting hydrogen that meets the requirements in the low-temperature state of solid hydrogen storage, that is, it is difficult to ensure that the fuel cell engine can start successfully quickly.

[0004] The invention patent with the publication number CN117841784A was published on April 9, 2024, with the title of a solid hydrogen storage fuel cell forklift system and its thermal management method. The system includes a fuel cell system, a power battery component, and a hydrogen storage and buffer component. The method includes calculating the heat released by the fuel cell system and the power battery respectively, as well as the heat absorbed by the hydrogen storage material and the heat absorption and energy storage material, and guiding the selection of the cooling fan or the selection and dosage of the heat absorption and energy storage material according to the heat conservation relationship. This solid hydrogen storage fuel cell forklift system and its thermal management method also cannot solve the above-mentioned technical problems. Summary of the Invention

[0005] The purpose of the present invention is to provide a hydrogen storage and supply system for a hydrogen fuel cell and a method for low-temperature startup of the battery that meet the startup process of a hydrogen fuel cell in a low-temperature environment and save the application cost of additional heating components in view of the deficiencies of the prior art.

[0006] To achieve the above object, the technical solution adopted by the present invention is as follows:

[0007] The hydrogen fuel cell hydrogen storage and supply system includes a fuel cell, the fuel cell is connected to a first gas supply pipeline and a second gas supply pipeline, the first gas supply pipeline and the second gas supply pipeline are connected, the first gas supply pipeline includes a solid hydrogen storage bottle, a first bottle solenoid valve is provided on the first gas supply pipeline, the second gas supply pipeline includes a gaseous hydrogen storage bottle, and a second bottle solenoid valve is provided on the second gas supply pipeline.

[0008] A hydrogen compressor is provided on the second gas supply pipeline, and the hydrogen compressor includes an outlet pressure sensor.

[0009] A first pressure sensor and a first temperature sensor are sequentially arranged at the outlet end of the solid hydrogen storage bottle, and a second pressure sensor and a second temperature sensor are sequentially arranged at the outlet end of the gaseous hydrogen storage bottle.

[0010] The solid hydrogen storage bottle is connected with a PTC electric heater, and the fuel cell is connected to the solid hydrogen storage bottle by a heat supply pipeline.

[0011] A first manual valve is provided at one end of the first gas supply pipeline close to the fuel cell; a second manual valve is provided at one end of the second gas supply pipeline close to the fuel cell.

[0012] The battery low-temperature starting method is realized by using the above hydrogen fuel cell hydrogen storage and supply system, and includes the following steps:

[0013] Step 1: The solid hydrogen storage bottle starts to supply hydrogen to the fuel cell;

[0014] Step 2: The second bottle solenoid valve is opened, and a part of the hydrogen supplied by the solid hydrogen storage bottle is filled into the gaseous hydrogen storage bottle;

[0015] Step 3: When the ambient temperature is lower than the freezing point, the first bottle solenoid valve is closed, the solid hydrogen storage bottle stops, and at the same time the second bottle solenoid valve is opened, and the gaseous hydrogen storage bottle starts to supply the fuel cell;

[0016] Step 4: The fuel cell supplies heat to the solid hydrogen storage bottle through the heat supply pipeline;

[0017] Step 5: When the solid hydrogen storage bottle reaches the set temperature, it starts, the first bottle solenoid valve is opened and the gaseous hydrogen storage bottle is closed.

[0018] The said Step 2 includes the following steps: When the pressures detected by the first pressure sensor and the second pressure sensor reach equilibrium; the hydrogen compressor starts to boost the hydrogen released from the solid hydrogen storage bottle; when the pressure detected by the second pressure sensor exceeds 5 MPa, the second bottle solenoid valve and the hydrogen compressor are successively closed.

[0019] The set temperature is 50-70°C.

[0020] Step 5 includes the following steps: When the second pressure sensor detects that the pressure is 3-5 MPa, start the hydrogen compressor to boost the hydrogen released from the solid hydrogen storage cylinder; when the second pressure sensor detects that the pressure exceeds 5 MPa, close the second bottle mouth solenoid valve and the hydrogen compressor successively.

[0021] The technical effects of the present invention are as follows: By adopting the hydrogen storage and supply system for a hydrogen fuel cell and the method for low-temperature startup of the battery of the present invention, through the hydrogen storage of gaseous hydrogen by the solid hydrogen storage system and the operation process of the two gas supply pipelines in a low-temperature environment, the use cost of external heating equipment is saved, and the gas supply system can continuously and stably supply hydrogen to the fuel cell to ensure the timely startup of the fuel cell. The problem that the existing system is difficult to ensure the stable release of hydrogen by using self-generated heat as a heat source is solved. Moreover, the temperature and pressure detection of hydrogen by relevant auxiliary components on the gas supply pipeline can monitor the gas state in real time to ensure the stable operation of the system. Description of the Drawings

[0022] This specification includes the following drawings, and the shown contents are respectively:

[0023] Figure 1 It is a schematic diagram of the hydrogen storage and supply system for a hydrogen fuel cell of the present invention.

[0024] The marks in the figure are: 1, fuel cell; 2, first gas supply pipeline; 3, second gas supply pipeline; 4, solid hydrogen storage cylinder; 5, gaseous hydrogen storage cylinder; 6, first bottle mouth solenoid valve; 7, second bottle mouth solenoid valve; 8, hydrogen compressor; 9, outlet pressure sensor; 10, first pressure sensor; 11, first temperature sensor; 12, second pressure sensor; 13, second temperature sensor; 14, first manual valve; 15, second manual valve; 16, heat supply pipeline; 17, PTC electric heater. Detailed Embodiments

[0025] The following is a more detailed description of the specific embodiments of the present invention by referring to the drawings and describing the embodiments, aiming to help those skilled in the art have a more complete, accurate and in-depth understanding of the inventive concept and technical solution of the present invention and facilitate its implementation.

[0026] As Figure 1As shown in the figure, the hydrogen storage and supply system for a hydrogen fuel cell includes a fuel cell 1, which is connected to a first gas supply pipeline 2 and a second gas supply pipeline 3. The first gas supply pipeline 2 and the second gas supply pipeline 3 are connected. The first gas supply pipeline 2 includes a solid hydrogen storage bottle 4, and a first bottle solenoid valve 6 is provided on the first gas supply pipeline 2. The second gas supply pipeline 3 includes a gaseous hydrogen storage bottle 5, and a second bottle solenoid valve 7 is provided on the second gas supply pipeline 3. In this system, the fuel cell stack of the fuel cell 1 is the main power source of the power system. The fuel cell 1 uses hydrogen and oxygen to carry out an electrochemical reaction to generate electric energy, and the exhaust is only water, which is clean and environmentally friendly. Moreover, the electric energy conversion efficiency is high, that is, the energy utilization rate is high. In addition, the load increase and decrease rate is high, which can fully meet the requirements of the whole vehicle for power performance. The solid hydrogen storage system is the fuel storage device of the whole power system. Due to the high hydrogen storage density, small occupied space and adaptable development according to the space size of the whole vehicle, solid hydrogen storage can meet the long-range requirements. At the same time, on the basis of the solid hydrogen storage gas supply, a gaseous hydrogen storage bottle 5 and related components are added to ensure the stable operation of the whole hydrogen supply system. The end of the second gas supply pipeline 3 is connected to the first gas supply pipeline 2, so that the second gas supply pipeline 3 can not only be used as the gas supply pipeline of the fuel cell 1 in a low-temperature environment, but also be used as the charging pipeline for the gaseous hydrogen storage bottle 5 when the solid hydrogen storage bottle 4 releases hydrogen, thus facilitating the layout of the thermal management system on the whole vehicle.

[0027] As Figure 1 shown, a hydrogen compressor 8 is provided on the second gas supply pipeline 3, and the hydrogen compressor 8 includes an outlet pressure sensor 9. In this system, a hydrogen compressor 8 is added to the second gas supply pipeline 3. When the hydrogen release amount or release pressure is insufficient, according to the pressure difference between the two gas supply pipelines, the operation of the hydrogen compressor 8 is controlled by detecting and feedback signals through the pressure sensor, so that the hydrogen generated by the solid hydrogen storage bottle 4 can be pressurized to a higher pressure by mechanical compression and stored in the hydrogen storage bottle, that is, to ensure more gaseous hydrogen storage.

[0028] As Figure 1 shown, a first pressure sensor 10 and a first temperature sensor 11 are sequentially arranged at the outlet end of the solid hydrogen storage bottle 4, and a second pressure sensor 12 and a second temperature sensor 13 are sequentially arranged at the outlet end of the gaseous hydrogen storage bottle 5. Since the fuel cell 1 is the place for electrochemical reaction, the gas supply system provides the reactants hydrogen and oxygen for it, and hydrogen and oxygen must meet the parameters such as pressure, flow rate, temperature, humidity, etc. required by the fuel cell stack of the fuel cell 1 under various working conditions. Among them, oxygen is obtained by filtering, compressing, cooling and humidifying the ambient air through the air system. Corresponding temperature and pressure sensors and other components are arranged on both the solid and gaseous gas supply pipelines to detect the pressure and temperature on their respective gas supply pipelines, so as to be able to monitor the gas state in real time. If an abnormality occurs during operation, the abnormal pipeline can be closed in time through the bottle solenoid valve or manual valve.

[0029] As Figure 1As shown, a PTC electric heater 17 is connected to the solid-state hydrogen storage bottle 4, and a heat supply pipeline 16 is connected between the fuel cell 1 and the solid-state hydrogen storage bottle 4. The PTC electric heater 17 assists in providing heat to the solid-state hydrogen storage bottle 4 during the startup phase of the fuel cell 1, enabling the solid-state hydrogen storage bottle 4 to reach the set temperature and release hydrogen after startup. The heat supply pipeline 16 is used to conduct the heat continuously generated during the operation of the fuel cell 1 to the solid-state hydrogen storage bottle 4 to support the release of hydrogen from the solid-state hydrogen storage, thereby improving the system efficiency by utilizing the waste heat of the battery. In the case of sufficient hydrogen, a self-sustaining system can be formed, and the PTC electric heater 17 does not need to adopt high-power parameters, which can reduce the layout difficulty and equipment cost.

[0030] As Figure 1 shown, a first manual valve 14 is provided at one end of the first gas supply pipeline 2 close to the fuel cell 1; a second manual valve 15 is provided at one end of the second gas supply pipeline 3 close to the fuel cell 1. The above two manual valves can respectively control the on / off of the two gas supply pipelines, facilitating the maintenance process.

[0031] This method for starting the battery at low temperature is realized by using the above hydrogen fuel cell hydrogen storage and gas supply system, and includes the following steps:

[0032] Step 1: The solid-state hydrogen storage bottle 4 starts to supply hydrogen to the fuel cell 1;

[0033] Step 2: The second bottle mouth solenoid valve 7 is opened, and a part of the hydrogen supplied by the solid-state hydrogen storage bottle 4 is filled into the gaseous hydrogen storage bottle 5;

[0034] Step 3: When the ambient temperature is lower than the freezing point, the first bottle mouth solenoid valve 6 is closed, the solid-state hydrogen storage bottle 4 stops, and at the same time the second bottle mouth solenoid valve 7 is opened, and the gaseous hydrogen storage bottle 5 starts to supply the fuel cell 1;

[0035] Step 4: The fuel cell 1 supplies heat to the solid-state hydrogen storage bottle 4 through the heat supply pipeline 16;

[0036] Step 5: When the solid-state hydrogen storage bottle 4 reaches the set temperature, it starts, the first bottle mouth solenoid valve 6 is opened, and the gaseous hydrogen storage bottle 5 is closed.

[0037] Step 2 includes the following steps: when the pressure detected by the first pressure sensor 10 and the second pressure sensor 12 reaches equilibrium; the hydrogen compressor 8 starts to pressurize the hydrogen released by the solid-state hydrogen storage bottle 4; when the pressure detected by the second pressure sensor 12 exceeds 5MPa, the second bottle mouth solenoid valve 7 and the hydrogen compressor 8 are closed successively; the solid-state hydrogen storage is the main hydrogen storage device, which can be replaced simply and conveniently after use. The hydrogen released by the solid-state hydrogen storage is stored in the gaseous hydrogen storage bottle 5 after pressurization. The capacity requirement of the gaseous hydrogen storage bottle 5 is not large, and it can meet the hydrogen required for 5-10 low-temperature starts and from idle speed to the rated power point. During the charging process of the gaseous hydrogen storage bottle 5, when the pressure of the two gas supply pipelines is the same, the gaseous hydrogen storage bottle 5 is difficult to continue to charge, and the hydrogen compressor 8 mechanically pressurizes it to a higher pressure for storage, thereby creating starting conditions for the subsequent low-temperature starting process.

[0038] The set temperature is 50-70°C. In this system, hydrogen is provided by a vehicle-mounted solid-state hydrogen storage system and a gaseous hydrogen storage system, which need to meet certain flow rate, pressure and other parameter values. Under vehicle-mounted conditions, since the hydrogen release process needs to continuously absorb heat, the temperature range is 50-70°C for the best. Too high a temperature will cause the hydrogen supply pressure and flow to be unstable, causing the system to be more difficult to control and even cause problems such as malfunctions and shutdowns. Too low a temperature will cause insufficient hydrogen release or even the inability to release hydrogen, and the system will also fail to work. Therefore, according to the temperature detection of the first temperature sensor 11 on the first gas supply pipeline 2, it is ensured that the solid-state hydrogen storage bottle 4 is in the optimal temperature range, and heat is continuously provided to it during operation to ensure that hydrogen can be released continuously.

[0039] Step 5 includes the following steps: when the second pressure sensor 12 detects a pressure of 3-5MPa, the hydrogen compressor 8 is turned on to pressurize the hydrogen released from the solid hydrogen storage bottle 4; when the second pressure sensor 12 detects a pressure exceeding 5MPa, the second bottle mouth solenoid valve 7 and the hydrogen compressor 8 are closed successively. After the solid hydrogen storage bottle 4 and the fuel cell 1 continue to operate stably, the amount of hydrogen in the gaseous hydrogen storage bottle 5 decreases, and the pressure decreases accordingly. The solid hydrogen storage bottle 4 can be used to inflate the gaseous hydrogen storage bottle 5. When the pressure of the gaseous hydrogen storage bottle 5 is lower than 5MPa but greater than 3MPa, the hydrogen compressor 8 is turned on, and it is not turned on when it is lower than 3MPa.

[0040] At present, hydrogen supply vehicles based on solid-state hydrogen storage do not have gaseous hydrogen storage bottles 5, and the problems are long start-up time and inability to start at freezing point temperatures. The material of the solid-state hydrogen storage bottle tank is generally single-component metal or alloy, which has high thermal conductivity and fast heat exchange with the environment. It only provides heat energy through its own PTC electric heater. In order to ensure that the temperature rises rapidly, a high-power PTC device is required, which increases the cost of equipment. The use of lithium batteries on the vehicle to quickly provide electricity at a high rate has high energy consumption on the one hand, and on the other hand, lithium batteries cannot provide high-rate performance at freezing point temperatures under the target of rapid temperature rise. Therefore, the gaseous hydrogen storage bottle 5 is used in a low-temperature environment to ensure that the fuel cell 1 system starts quickly, quickly loads the power to generate a large amount of heat, and then uses the generated heat to provide energy for the solid-state hydrogen storage bottle 4 to release hydrogen. Its advantage is that it does not require an external heat source to directly provide hydrogen that meets the pressure and flow rate.

[0041] The specific working plan is that during the startup phase, the auxiliary heat generated by the auxiliary equipment of the fuel cell 1 or the operation of the fuel cell 1 provides heat to the solid-state hydrogen storage bottle 4. After a series of controls and actions, the solid-state hydrogen storage bottle 4 will continuously output hydrogen at a certain pressure flow rate according to the set target for use by the fuel cell 1. During the operation of the fuel cell 1, heat is continuously generated to support the solid-state hydrogen storage to release hydrogen, and this cycle continues.

[0042] When the fuel cell 1 is running continuously, the solid hydrogen storage bottle 4 continuously outputs hydrogen, and the output hydrogen pressure is about 2-3MPa. At this time, there is no hydrogen in the gaseous hydrogen storage bottle 5, and hydrogen can be directly filled into the gaseous hydrogen storage bottle 5. When the pressure reaches equilibrium, it can be judged by the pressure sensor. At this time, the hydrogen compressor 8 can be turned on to pressurize the hydrogen released by the solid hydrogen storage bottle 4, and the outlet pressure sensor 9 is used to judge the pressure after pressurization and whether the hydrogen compressor 8 is working normally. When the pressure of the gaseous hydrogen storage bottle 5 exceeds 5MPa, the second bottle mouth solenoid valve 7 is closed first, and then the hydrogen compressor 8 is closed. At this time, the hydrogen required for the operation of the fuel cell 1 is provided by the solid hydrogen storage bottle 4, and the first and second temperature sensors 13 are used to feedback the temperature state of the hydrogen in the hydrogen storage tank in real time to identify whether there is an abnormality.

[0043] When the ambient temperature is below the freezing point, when the fuel cell 1 is started at low temperature, the first bottle mouth solenoid valve 6 of the solid hydrogen storage bottle 4 is closed, and the second bottle mouth solenoid valve 7 of the gaseous hydrogen storage bottle 5 is opened. At this time, the hydrogen is completely provided by the gaseous hydrogen storage bottle 5, and the fuel cell 1 system is started according to the low-temperature start-up strategy. When the fuel cell 1 is successfully started, it can continuously generate heat. When the system enters high-power operation, the heat will continue to increase, and the heat generated in the process will be supplied to the solid hydrogen storage bottle 4.

[0044] When the device temperature reaches the range of 50 - 70 °C, the solid-state hydrogen storage bottle 4 can continuously generate hydrogen. When the hydrogen release temperature of the hydrogen storage tank reaches the amount of hydrogen that can output the corresponding power demand of the fuel cell 1, the first bottle mouth solenoid valve 6 is opened, and the hydrogen released from the solid-state hydrogen storage bottle 4 is used to provide the reaction of the fuel cell 1. Synchronously, according to the feedback data of the first and second pressure sensors 12, it is judged whether the hydrogen compressor 8 needs to be started. When the pressure of the gaseous hydrogen storage bottle 5 is lower than 5 MPa but greater than 3 MPa, the hydrogen compressor 8 is started; when it is lower than 3 MPa, it is not started.

[0045] The hydrogen storage and supply system for the hydrogen fuel cell and the method for low-temperature startup of the battery, through the hydrogen storage of gaseous hydrogen by the solid-state hydrogen storage system and the operation process of the two gas supply pipelines in a low-temperature environment, save the use cost of external heating equipment, and ensure that the gas supply system can continuously and stably supply hydrogen to the fuel cell 1, ensuring the timely startup of the fuel cell 1. It solves the problem that it is difficult to ensure the stable release of hydrogen by using self-generated heat in the existing system. Moreover, the detection of the temperature and pressure of hydrogen by the relevant auxiliary components on the gas supply pipeline can monitor the gas state in real time and ensure the stable operation of the system.

[0046] The present invention has been described exemplarily in combination with the accompanying drawings. Obviously, the specific implementation of the present invention is not limited by the above methods. As long as various non-substantive improvements are made by adopting the method concept and technical solution of the present invention; or without improvement, the above concept and technical solution of the present invention are directly applied to other occasions, they are all within the protection scope of the present invention.

Claims

1. A hydrogen fuel cell hydrogen storage and gas supply system, characterized in that: It includes a fuel cell, the fuel cell is connected to a first gas supply pipeline and a second gas supply pipeline, the first gas supply pipeline and the second gas supply pipeline are connected, the first gas supply pipeline includes a solid hydrogen storage bottle, a first bottle mouth solenoid valve is provided on the first gas supply pipeline, the second gas supply pipeline includes a gaseous hydrogen storage bottle, a second bottle mouth solenoid valve is provided on the second gas supply pipeline.

2. The hydrogen fuel cell hydrogen storage and gas supply system according to claim 1, characterized in that: The second gas supply pipeline is provided with a hydrogen compressor, and the hydrogen compressor includes an outlet pressure sensor.

3. The hydrogen fuel cell hydrogen storage and gas supply system according to claim 2, characterized in that: The outlet end of the solid-state hydrogen storage bottle is provided with a first pressure sensor and a first temperature sensor in sequence, and the outlet end of the gaseous hydrogen storage bottle is provided with a second pressure sensor and a second temperature sensor in sequence.

4. The hydrogen fuel cell hydrogen storage and gas supply system according to claim 3, characterized in that: The solid-state hydrogen storage bottle is connected to a PTC electric heater, and the fuel cell and the solid-state hydrogen storage bottle are connected to a heating pipeline.

5. The hydrogen fuel cell hydrogen storage and supply system according to claim 4, characterized in that: A first manual valve is disposed on one end of the first gas supply pipeline close to the fuel cell; a second manual valve is disposed on one end of the second gas supply pipeline close to the fuel cell.

6. A battery low temperature starting method, implemented by using the hydrogen fuel cell hydrogen storage and gas supply system according to claim 4 or 5, characterized in that: The following steps are involved: Step 1: The solid-state hydrogen storage bottle starts to supply hydrogen to the fuel cell; Step 2: The second bottle port solenoid valve is opened, and the solid hydrogen storage bottle supplies a portion of hydrogen to fill the gaseous hydrogen storage bottle; Step 3: When the ambient temperature is below freezing, the first bottle port solenoid valve is closed, the solid hydrogen storage bottle stops, and the second bottle port solenoid valve is opened, and the gaseous hydrogen storage bottle starts to supply the fuel cell; Step 4: The fuel cell supplies heat to the solid hydrogen storage bottle through the heating pipeline; Step 5: When the solid hydrogen storage bottle reaches the set temperature, it starts, opens the first bottle port solenoid valve and closes the gaseous hydrogen storage bottle.

7. The battery low temperature starting method according to claim 6, characterized in that: The step 2 comprises the following steps: when the pressure detected by the first pressure sensor and the second pressure sensor reaches equilibrium; the hydrogen compressor is started to pressurize the hydrogen released from the solid-state hydrogen storage bottle; when the pressure detected by the second pressure sensor exceeds 5MPa, the second bottle mouth solenoid valve and the hydrogen compressor are closed successively.

8. The battery low temperature starting method according to claim 6, characterized in that: The set temperature is 50-70°C.

9. The battery low temperature starting method according to claim 6, characterized in that: The step 5 comprises the following steps: when the second pressure sensor detects a pressure of 3-5MPa, the hydrogen compressor is turned on to pressurize the hydrogen released from the solid-state hydrogen storage bottle; when the second pressure sensor detects a pressure exceeding 5MPa, the second bottle mouth solenoid valve and the hydrogen compressor are closed successively.

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