Vehicle-mounted liquid hydrogen system and control method, vehicle

Abstract

The application discloses a vehicle-mounted liquid hydrogen system and a control method and a vehicle, and solves the technical problems of energy waste and safety caused by direct discharge of hydrogen gas vaporized in a liquid hydrogen bottle in the prior art. The vehicle-mounted liquid hydrogen system comprises a liquid hydrogen bottle, a first hydrogen supply pipeline, an input end of which is communicated with a liquid phase outlet of the liquid hydrogen bottle, and an output end of which is communicated with a fuel cell, the first hydrogen supply pipeline being provided with a first electric control valve, a second hydrogen supply pipeline, an input end of which is communicated with a gas phase outlet of the liquid hydrogen bottle, and an output end of which is communicated with the first hydrogen supply pipeline, the second hydrogen supply pipeline being provided with a second electric control valve, and a third hydrogen supply pipeline, an input end of which is communicated with the gas phase outlet of the liquid hydrogen bottle, and an output end of which is communicated with the first hydrogen supply pipeline, the third hydrogen supply pipeline being provided with a gas tank and two third electric control valves in communication, and the two third electric control valves being respectively located at the input end and the output end of the gas tank. The vehicle-mounted liquid hydrogen system of the application realizes recycling and utilization of hydrogen gas vaporized in the liquid hydrogen bottle, and improves energy utilization.

Description

Technical Field

[0001] The present application belongs to the technical field of vehicle-mounted liquid hydrogen systems, and specifically relates to a vehicle-mounted liquid hydrogen system, a control method, and a vehicle. Background Art

[0002] In a vehicle's liquid hydrogen system, the required storage temperature for liquid hydrogen is very low. While the vehicle is operating, the liquid hydrogen tank needs to continuously supply fuel to the fuel-electric system. The hydrogen supply line requires a certain pressure to maintain the liquid hydrogen fuel supply. When the liquid hydrogen in the tank vaporizes due to heat absorption, and the pressure inside the tank reaches a certain value, the hydrogen needs to be released through a safety valve. This not only wastes energy, but also directly releases the vaporized hydrogen into the air, posing a safety hazard. Summary of the Invention

[0003] In order to solve the energy waste and safety technical problems caused by the direct release of vaporized hydrogen in the current liquid hydrogen bottle, the present application provides a vehicle-mounted liquid hydrogen system and control method, and a vehicle.

[0004] In a first aspect of the present application, there is provided a vehicle-mounted liquid hydrogen system, comprising:

[0005] Liquid hydrogen bottle, used to store liquid hydrogen;

[0006] a first hydrogen supply pipeline, the input end of which is connected to the liquid phase outlet of the liquid hydrogen bottle, and the output end of which is used to connect to the fuel cell, and the first hydrogen supply pipeline is provided with a first electronically controlled valve;

[0007] a second hydrogen supply pipeline, the input end of which is connected to the gas phase outlet of the liquid hydrogen bottle, the output end of which is connected to the first hydrogen supply pipeline and is close to the output end of the first electronically controlled valve; the second hydrogen supply pipeline is provided with a second electronically controlled valve;

[0008] A third hydrogen supply pipeline, the input end of which is connected to the gas phase outlet of the liquid hydrogen bottle, and the output end of which is connected to the first hydrogen supply pipeline and is close to the output end of the first electrically controlled valve. The third hydrogen supply pipeline is provided with a connected gas tank and a third electrically controlled valve. There are two third electrically controlled valves, which are respectively located at the input end and the output end of the gas tank;

[0009] a first pressure sensor, configured to detect the gas pressure in the gas tank;

[0010] a second pressure sensor, configured to detect the gas phase pressure in the liquid hydrogen bottle;

[0011] A controller is electrically connected to the first electrically controlled valve, the second electrically controlled valve, the third electrically controlled valve, the first pressure sensor, and the second pressure sensor.

[0012] In some embodiments, the third hydrogen supply pipeline includes a compression component for compressing the gas in the gas tank, and the compression component is electrically connected to the controller.

[0013] In some embodiments, the compression assembly includes a compressor and a driving member, the driving member is transmission-connected to the compressor, the compressor is connected to the gas tank and is close to the liquid hydrogen bottle, and the driving member is electrically connected to the controller.

[0014] In some embodiments, the first hydrogen supply pipeline is provided with a power output component, a vaporizer and a buffer tank, the first electrically controlled valve, the power output component, the vaporizer and the buffer tank are connected in sequence along the medium flow direction, the output end of the third hydrogen supply pipeline is connected to the buffer tank, and the power output component is electrically connected to the controller.

[0015] In some embodiments, a liquid filling pipeline and a discharge pipeline are further included, and both the liquid filling pipeline and the discharge pipeline are connected to the gas phase outlet of the liquid hydrogen bottle through a main pipe.

[0016] In some embodiments, the controller is configured to: at the first gas pressure P of the gas tank 01 >P1, the controller controls the third electronically controlled valve located at the output end of the gas tank to open, so that the gas in the gas tank is supplied to the fuel cell through the third hydrogen supply pipeline; 01 ≤P1 and the second gas pressure P of the gas phase in the liquid hydrogen bottle 02 >P2, the controller controls the second electronically controlled valve to open, so that the gas in the liquid hydrogen bottle is supplied to the fuel cell through the second hydrogen supply pipeline; 01 ≤P1 and P 02 When P1 is less than or equal to P2, the controller controls the first electronically controlled valve to open, so that the liquid in the liquid hydrogen bottle is supplied to the fuel cell through the first hydrogen supply pipeline; wherein P1 and P2 are both set values.

[0017] In a second aspect of the present application, a vehicle is provided, characterized in that it includes the on-board liquid hydrogen system of the first aspect.

[0018] In a second aspect of the present application, a control method for the on-vehicle liquid hydrogen system according to the first aspect is provided, comprising:

[0019] In response to the fuel cell start-up signal, the first gas pressure P of the gas tank is obtained. 01 ;

[0020] In P 01>P1, the third electronically controlled valve at the output end of the gas tank is controlled to conduct the third hydrogen supply pipeline, so that the gas in the gas tank is supplied to the fuel cell through the third hydrogen supply pipeline until P 01 ≤P1;

[0021] In P 01 When ≤P1, obtain the second gas pressure P of the gas phase in the liquid hydrogen bottle 02 ;

[0022] In P 02 >P2, the second electronically controlled valve is controlled to conduct the second hydrogen supply pipeline, so that the gas in the liquid hydrogen bottle is supplied to the fuel cell through the second hydrogen supply pipeline; wherein P1 and P2 are both set values; in P 02 When the pressure is less than or equal to P2, the first electronically controlled valve is controlled to conduct the first hydrogen supply pipeline, so that the liquid in the liquid hydrogen bottle is supplied to the fuel cell through the first hydrogen supply pipeline.

[0023] In some embodiments, the 02 When the pressure is less than or equal to P2, the first electronically controlled valve is controlled to conduct the first hydrogen supply pipeline, so that the liquid in the liquid hydrogen bottle is supplied to the fuel cell through the first hydrogen supply pipeline, specifically including:

[0024] When P3≤P 02 When P<=P2, the first electrically controlled valve is controlled to conduct the first hydrogen supply pipeline, and the second electrically controlled valve is controlled to conduct the second hydrogen supply pipeline, so that the liquid in the liquid hydrogen bottle is supplied to the fuel cell through the first hydrogen supply pipeline, and the gas in the liquid hydrogen bottle is supplied to the fuel cell through the second hydrogen supply pipeline; wherein P3 is the set value, P3<P2;

[0025] In P 02 When the pressure is less than P3, the first electronically controlled valve is controlled to conduct the first hydrogen supply pipeline, so that the liquid in the liquid hydrogen bottle is supplied to the fuel cell through the first hydrogen supply pipeline.

[0026] In a second aspect of the present application, a control method for the on-vehicle liquid hydrogen system according to the first aspect is provided, comprising:

[0027] In response to the fuel cell shutdown signal, the second gas pressure P of the gas phase in the liquid hydrogen bottle is obtained. 02 ;

[0028] In P 02 >P4 and P 02 >P 01 In the case of P, the third electronically controlled valve at the input end of the gas tank is controlled to conduct the third hydrogen supply pipeline, so that the gas in the liquid hydrogen bottle is stored in the gas tank through the third hydrogen supply pipeline; 02 >P4 and P 02 ≤P 01In this case, the third electrically controlled valve at the input end of the gas tank is controlled to conduct the third hydrogen supply pipeline, and the compression assembly is operated so that the gas in the liquid hydrogen bottle is compressed and stored in the gas tank through the third hydrogen supply pipeline until P 01 >P5 and / or P 02 <P4, where P4 is the set value and P5 is the designed maximum pressure of the gas tank.

[0029] The on-board liquid hydrogen system provided according to an embodiment of the present application includes a liquid hydrogen bottle, a first hydrogen supply pipeline, a second hydrogen supply pipeline, a third hydrogen supply pipeline, a first pressure sensor, a second pressure sensor, and a controller.

[0030] By providing a first hydrogen supply line and a first electrically controlled valve on the first hydrogen supply line, liquid hydrogen in the liquid hydrogen bottle can be supplied to the fuel cell. By providing a second hydrogen supply line and a second electrically controlled valve on the second hydrogen supply line, hydrogen gas in the liquid hydrogen bottle can be supplied to the fuel cell. By providing a third hydrogen supply line and a gas tank and two third electrically controlled valves on the third hydrogen supply line, hydrogen gas generated by evaporation of liquid hydrogen in the liquid hydrogen bottle can be recovered into the gas tank and supplied to the fuel cell as a gas source when the fuel cell is started, thereby achieving energy recovery and utilization.

[0031] By setting a first pressure sensor and a second pressure sensor, the gas phase pressure in the gas tank and the liquid hydrogen bottle is controlled to be obtained in real time, and the opening timing of the first hydrogen supply pipeline, the second hydrogen supply pipeline and the third hydrogen supply pipeline is controlled according to the two pressure values. The hydrogen formed by the evaporation of liquid hydrogen in the liquid hydrogen bottle is effectively utilized, energy consumption is reduced, and the safety hazards caused by the direct release of hydrogen in the liquid hydrogen bottle are avoided, thereby ensuring the stable operation of the fuel cell and effectively improving the endurance of the fuel cell vehicle.

[0032] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become obvious from the description below, or will be learned through practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 A schematic structural diagram of the vehicle-mounted liquid hydrogen system of the present application is shown.

[0034] Figure 2 Shown Figure 1 Schematic diagram of the medium flow path of the on-board liquid hydrogen system.

[0035] Figure 3 A step diagram of a control method for an on-vehicle liquid hydrogen system according to the third aspect of the present application is shown.

[0036] Figure 4 A step diagram of a control method for a vehicle-mounted liquid hydrogen system according to the fourth aspect of the present application is shown.

[0037] Description of reference numerals:

[0038] 100-onboard liquid hydrogen system; 110-first hydrogen supply pipeline, 111-first electronically controlled valve, 112-first one-way valve, 113-flow regulating valve, 114-power output, 115-carburetor, 116-buffer tank, 117-pressure regulating valve, 118-main electronically controlled valve, 120-second hydrogen supply pipeline, 121-second electronically controlled valve, 130-third hydrogen supply pipeline, 131-third electronic valve at the input end of the gas tank Control valve, 132-drive part, 133-compressor, 134-gas tank, 135-second one-way valve, 136-third electric control valve at the output end of the gas tank, 137-pressure reducing valve, 140-liquid filling pipeline, 141-liquid filling one-way valve, 150-discharge pipeline, 151-main safety valve, 152-auxiliary safety valve, 160-vent valve, 170-socket connector, 180-liquid hydrogen bottle, 190-controller.

[0039] 200-Fuel cell. DETAILED DESCRIPTION

[0040] In order to enable those skilled in the art to understand the present application more clearly, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of this application.

[0041] The first embodiment of the present application provides a vehicle-mounted liquid hydrogen system, which can recover vaporized hydrogen in the liquid hydrogen bottle and supply it to the fuel cell, thereby realizing energy utilization and avoiding safety problems caused by direct discharge.

[0042] See also Figure 1 as well as Figure 2 The on-board liquid hydrogen system 100 provided in an embodiment of the present application includes a liquid hydrogen bottle 180, a first hydrogen supply pipeline 110, a second hydrogen supply pipeline 120, a third hydrogen supply pipeline 130, a first pressure sensor, a second pressure sensor and a controller 190.

[0043] The liquid hydrogen bottle 180 is a structure for storing liquid hydrogen and also a structure for providing raw materials to the fuel cell 200. It is provided with a liquid phase region and a gas phase region, with the liquid phase region at the bottom and the gas phase region at the top. The second pressure sensor can detect the gas phase pressure in the liquid hydrogen bottle 180.

[0044] The first hydrogen supply pipeline 110 is a conventional hydrogen supply pipeline, whose input end is connected to the liquid phase outlet of the liquid hydrogen bottle 180, and the output end is used to connect to the fuel cell 200. The first hydrogen supply pipeline 110 is provided with a first electrically controlled valve 111. When the first electrically controlled valve 111 is closed, the first hydrogen supply pipeline 110 can be cut off. When the first electrically controlled valve 111 is opened, the first hydrogen supply pipeline 110 can be connected, so that the liquid hydrogen in the liquid hydrogen bottle 180 is supplied to the fuel cell 200 through the first hydrogen supply pipeline 110.

[0045] The second hydrogen supply pipeline 120 is an economic pipeline, whose input end is connected to the gas phase outlet of the liquid hydrogen bottle 180, and the output end is connected to the first hydrogen supply pipeline 110, and is close to the output end of the first electric control valve 111. The second hydrogen supply pipeline 120 is provided with a second electric control valve 121. When the second electric control valve 121 is closed, the second hydrogen supply pipeline 120 can be medium, and when the second electric control valve 121 is opened, the second hydrogen supply pipeline 120 can be conducted, so that the hydrogen in the liquid hydrogen bottle 180 is supplied to the fuel cell 200 through the second hydrogen supply pipeline 120.

[0046] The third hydrogen supply pipeline 130 is a recovery supply pipeline, and its input end is connected to the gas phase outlet of the liquid hydrogen bottle 180. Therefore, during the parking process of the vehicle, the hydrogen generated by the heat and evaporation in the liquid hydrogen bottle 180 will increase the pressure inside the liquid hydrogen bottle 180. At this time, the gas can flow into the third hydrogen supply pipeline 130, and its output end is connected to the gas supply pipeline. The third hydrogen supply pipeline 130 is provided with a connected gas tank 134 and a third electrically controlled valve. There are two third electrically controlled valves, which are respectively located at the input and output ends of the gas tank 134. Therefore, when the third electrically controlled valve 131 located at the input end of the gas tank 134 is closed, the hydrogen in the liquid hydrogen bottle 180 cannot enter the gas tank 134. When the third electrically controlled valve 131 located at the input end of the gas tank 134 is opened, the hydrogen generated by the evaporation of liquid hydrogen in the liquid hydrogen bottle 180 can flow into the gas tank 134 through the third electrically controlled valve for temporary storage. When the third electrically controlled valve 136 at the output end of the gas tank 134 is closed, the third hydrogen supply pipeline 130 is cut off. When the vehicle is started and the third electrically controlled valve 136 at the output end of the gas tank 134 is opened, the hydrogen in the gas tank 134 can be supplied to the fuel cell 200. In other words, when the third electrically controlled valve 131 at the input end of the gas tank 134 is opened and the third electrically controlled valve 136 at the output end of the gas tank 134 is closed, the hydrogen in the liquid hydrogen bottle 180 can be temporarily stored in the gas tank 134, thereby realizing the recovery of the hydrogen in the liquid hydrogen bottle 180; when the third electrically controlled valve 131 at the input end of the gas tank 134 is closed and the third electrically controlled valve 136 at the output end of the gas tank 134 is opened, the hydrogen in the gas tank 134 can be supplied to the fuel cell 200, thereby realizing the effective utilization of the recovered hydrogen.

[0047] The first pressure sensor can be used to detect the gas pressure in the gas tank 134 on the third hydrogen supply pipeline 130, thereby determining whether the gas tank 134 has the ability to store hydrogen generated by evaporation of liquid hydrogen in the recovered liquid hydrogen bottle 180 and the ability to supply hydrogen to the fuel cell 200;

[0048] The second pressure sensor can be used to detect the gas phase pressure in the liquid hydrogen bottle 180, thereby determining whether the gas in the liquid hydrogen bottle 180 has a need to be recovered and whether the gas in the liquid hydrogen bottle 180 has the ability to directly supply hydrogen to the fuel cell 200.

[0049] The controller 190 is electrically connected to the first electrically controlled valve 111, the second electrically controlled valve 121, the third electrically controlled valve, the first pressure sensor and the second pressure sensor. Therefore, the controller 190 can receive the pressure signals sent by the first pressure sensor and the second pressure sensor, and control the first electrically controlled valve 111, the second electrically controlled valve 121 and the third electrically controlled valve to open or close under different conditions according to the pressure signals, so that the corresponding hydrogen supply pipelines are turned on or off, thereby using different hydrogen supply pipelines to supply hydrogen to the fuel cell 200, realizing the recovery and utilization of the hydrogen in the liquid hydrogen bottle 180, avoiding energy waste, and ensuring the stable operation of the fuel cell 200.

[0050] See also Figure 1The first hydrogen supply line 110 is provided with a power output member 114, a vaporizer 115, and a buffer tank 116, which are sequentially connected along the medium flow direction. The first electrically controlled valve 111 is close to the input end of the power output member 114, and the output end of the third hydrogen supply line 130 is connected to the buffer tank 116. The power output member 114 can be a power pump, such as a cryogenic submersible pump, which can provide power for the liquid hydrogen in the liquid hydrogen bottle 180 to circulate in the first hydrogen supply line 110 without relying on other booster lines. Even if the liquid hydrogen in the liquid hydrogen bottle 180 vaporizes to form hydrogen gas, causing large pressure fluctuations in the liquid hydrogen bottle 180, the stability of the hydrogen supply from the first hydrogen supply line 110 to the fuel cell 200 can still be guaranteed, and the structure is simple. The vaporizer 115 can vaporize liquid hydrogen into hydrogen gas, which meets the fuel cell 200's requirements for the form of raw materials. The buffer tank 116 can buffer the hydrogen gas, further improving the stability of the hydrogen supply to the fuel cell 200. In a specific implementation, the output end of the second hydrogen supply line 120 can be located between the first electrically controlled valve 111 and the power output 114 to achieve independent hydrogen supply to the first hydrogen supply line 110 and the second hydrogen supply line 120, respectively. Of course, the output end of the second hydrogen supply line 120 can also be directly connected to the buffer tank 116, so that the first hydrogen supply line 110 and the second hydrogen supply line 120 can each independently supply hydrogen to the fuel cell 200. In other embodiments, the first hydrogen supply line 110 can also be provided with no power output 114, and the liquid hydrogen can be driven to circulate in the first hydrogen supply line 110 by the pressure difference within the liquid hydrogen bottle 180. In another embodiment, the output end of the second hydrogen supply line 120 can also be connected to the output end of the vaporizer 115, and the vaporized hydrogen can be returned to the liquid hydrogen bottle 180 through the second hydrogen supply line 120 to increase the pressure difference, thereby driving the liquid hydrogen to circulate in the first hydrogen supply line 110. However, this may cause insufficient pressure in the liquid hydrogen bottle 180, making it impossible to supply hydrogen to the fuel cell 200 alone through the second gas supply line.

[0051] See also Figure 1The first hydrogen supply line 110 further includes a first one-way valve 112, a flow regulating valve 113, a pressure stabilizing valve 117, and a main electrically controlled valve 118. The first electrically controlled valve 111, the first one-way valve 112, the flow regulating valve 113, the power output 114, the buffer tank 116, the pressure stabilizing valve 117, and the main electrically controlled valve 118 are sequentially arranged along the medium flow direction. The first one-way valve 112 provided on the first hydrogen supply line 110 allows liquid hydrogen to flow only from the first electrically controlled valve 111 to the power output 114, preventing reverse flow. The flow regulating valve 113 regulates the flow of supplied liquid hydrogen or hydrogen gas flowing through the second hydrogen supply line 120. The pressure stabilizing valve 117 and the buffer tank 116 work together to stabilize the pressure of the flowing hydrogen gas. The main electronically controlled valve 118 can be closed when the fuel cell 200 is turned off, thereby cutting off the first hydrogen supply pipeline 110; when the fuel cell 200 is started, it can be opened to connect the first hydrogen supply pipeline 110, so that any hydrogen supply pipeline can be connected to the fuel cell 200 through the main electronically controlled valve 118 to realize the hydrogen supply function.

[0052] In some embodiments, see Figure 1 Gas tank 134 can be a conventional gas tank or a high-pressure BOG storage tank. If gas tank 134 is a high-pressure BOG storage tank, third hydrogen supply pipeline 130 further includes a compression assembly for compressing the gas within gas tank 134. The compression assembly is electrically connected to controller 190. Thus, when gas tank 134 recovers hydrogen, the gas can be compressed when the pressure within gas tank 134 and the liquid hydrogen bottle 180 are equal. This improves the recovery capability of gas within liquid hydrogen bottle 180 and increases the pressure of the recovered hydrogen within gas tank 134. This also ensures that gas tank 134 has sufficient pressure to supply hydrogen to fuel cell 200, thereby improving the stability of hydrogen supply to fuel cell 200. In other embodiments, third hydrogen supply pipeline 130 may not be provided with a compression assembly, while still enabling the temporary storage of hydrogen generated by evaporation of liquid hydrogen within liquid hydrogen bottle 180 in gas tank 134.

[0053] Please continue reading Figure 1 In some embodiments, the compression assembly includes a compressor 133 and a driver 132. The driver 132, such as a motor, is in driving connection with the compressor 133 to operate the compressor 133. The compressor 133 is connected to the gas tank 134 and is close to the liquid hydrogen bottle 180, thereby storing the compressed high-pressure gas in the gas tank 134. The compressor 133 can be a gas compressor 133 or an air compressor 133. For more details, please refer to the prior art disclosures and will not be described in detail in this application.

[0054] In some embodiments, the input and output ends of the third hydrogen supply pipeline 130 are both provided with a first quick-connect interface, and the gas phase outlet of the liquid hydrogen bottle 180 is connected to the vent valve 160 through a pipeline. The vent valve 160 can realize the external discharge of hydrogen. The vent valve 160 and the buffer tank 116 are both provided with a second quick-connect interface that matches the first quick-connect interface. The first quick-connect interface of the input end and the second quick-connect interface on the side of the vent valve 160 are detachably connected, and the first quick-connect interface of the output section and the second quick-connect interface on the side of the buffer tank 116 are detachably connected, so that the third hydrogen supply pipeline 130 can be quickly removed to realize the venting function when venting is required.

[0055] See also Figure 1 The third hydrogen supply line 130 is further provided with a second one-way valve 135 and a pressure reducing valve 137. The second one-way valve 135 can be located between the gas tank 134 and the third electrically controlled valve 136 at the output end of the gas tank 134. In other words, two second electrically controlled valves 121 are provided, one at the input end of the gas tank 134 and the other at the output end of the one-way valve. This prevents hydrogen backflow when the gas tank 134 supplies hydrogen to the fuel cell 200. The pressure reducing valve 137 is connected to the third electrically controlled valve 136 at the output end of the gas tank 134 and is located near the buffer tank 116. This reduces the pressure of the high-pressure hydrogen in the gas tank 134 before supplying it to the fuel cell 200.

[0056] Please continue reading Figure 1 The third electrically controlled valve and driver 132 on the third hydrogen supply line 130 are electrically connected to the controller 190 via a socket connector 170. The socket connector 170 facilitates the addition and removal of the third hydrogen supply line 130 from the entire onboard liquid hydrogen system 100. In a specific implementation, the socket connectors 170 may correspond one-to-one with the driver 132 and the two third electrically controlled valves, respectively. Alternatively, a single socket connector 170 may be provided with interfaces that electrically connect the driver 132 and the two third electrically controlled valves, respectively.

[0057] Please continue reading Figure 1 The on-board liquid hydrogen system 100 also includes a discharge pipeline 150 and a liquid filling pipeline 140. The liquid filling pipeline 140, the discharge pipeline 150 and the third hydrogen supply pipeline 130 are all connected to the gas phase outlet of the liquid hydrogen bottle 180 through a main pipe. The main pipe is connected to the vent valve 160 to reduce the number of interfaces of the liquid hydrogen bottle 180, reduce leakage hot spots, and reduce the volume of hydrogen formed by liquid hydrogen vaporization.

[0058] A safety valve is provided on the discharge line 150 to release the hydrogen in the liquid hydrogen bottle 180 when the pressure is too high but the conditions for recovery are not met. For example, if the hydrogen recovered in the gas tank 134 has reached its pressure limit, but the gas phase pressure in the liquid hydrogen bottle 180 is still very high, the safety valve can be opened to discharge the hydrogen. For another example, when the vehicle is parked and the gas phase pressure in the liquid hydrogen bottle 180 is too high, exceeding the set upper limit of the safety valve, the safety valve automatically opens and the hydrogen is discharged into the air through the safety valve. In specific implementation, two safety valves can be provided: one is a main safety valve 151 and the other is a secondary safety valve 152. The main safety valve 151 and the secondary safety valve 152 are connected in parallel to prevent safety hazards caused by failure of the main safety valve 151.

[0059] Please continue reading Figure 1 A one-way valve 141 is provided on the liquid filling line 140, so that the liquid hydrogen in the liquid filling line 140 can only flow from the liquid source to the liquid hydrogen bottle 180, and the gaseous hydrogen in the liquid hydrogen bottle 180 can be prevented from being discharged through the liquid filling line 140. In addition, the input end of the liquid filling line 140 forms a liquid filling port, which can be connected to a structure containing liquid hydrogen, so that the liquid hydrogen in the structure containing liquid hydrogen can flow into the liquid hydrogen bottle 180 through the liquid filling line 140.

[0060] In some embodiments, the controller 190 is configured to: 01 >P1, the controller 190 controls the third electronically controlled valve 136 at the output end of the gas tank 134 to open, so that the gas in the gas tank 134 is supplied to the fuel cell 200 through the third hydrogen supply pipeline 130. 01 ≤P1 and the second gas pressure P of the gas phase in the liquid hydrogen bottle 180 02 >P2, the controller 190 controls the second electronically controlled valve 121 to open, so that the gas in the liquid hydrogen bottle 180 is supplied to the fuel cell 200 through the second hydrogen supply pipeline 120. 01 ≤P1 and P 02 When P1 is less than or equal to P2, the controller 190 controls the first electronically controlled valve 111 to open, so that the liquid in the liquid hydrogen bottle 180 is supplied to the fuel cell 200 through the first hydrogen supply pipeline 110; wherein P1 and P2 are both set values.

[0061] An embodiment of a second aspect of the present application provides a vehicle comprising the on-board liquid hydrogen system 100 according to any embodiment of the first aspect.

[0062] The vehicle equipped with the on-board liquid hydrogen system 100 of the first aspect realizes the recycling and utilization of hydrogen in the liquid hydrogen bottle 180, saves energy, has good power output stability, and improves the cruising range.

[0063] An embodiment of the third aspect of the present application provides a control method for the on-board liquid hydrogen system 100 applied to any embodiment of the first aspect, and the control method for the on-board liquid hydrogen system 100 includes step S301, step S302, step S303 and step S304.

[0064] It should be noted that, because the on-board liquid hydrogen system 100 in the control method of the on-board liquid hydrogen system 100 is an on-board liquid hydrogen system 100 such as any of the above-mentioned technical solutions, the technical features and technical effects of the on-board liquid hydrogen system 100 such as any of the above-mentioned technical solutions will not be elaborated here.

[0065] See also Figure 3 , the specific steps of the control method are as follows:

[0066] S301, in response to the fuel cell 200 start signal, obtain the first gas pressure P of the gas tank 134 01 ;

[0067] In step S301, when the controller 190 receives a start signal from the fuel cell 200, the controller 190 controls the main electric control valve 118 of the first hydrogen supply pipeline 110 to open, so that the output end of the first hydrogen supply pipeline 110 is in a conducting state. The controller 190 obtains the first gas pressure P of the gas in the gas tank 134 detected by the first pressure sensor. 01 .

[0068] S302, in P 01 >P1, the third electronically controlled valve 136 at the output end of the gas tank 134 is controlled to conduct the third hydrogen supply pipeline 130, so that the gas in the gas tank 134 is supplied to the fuel cell 200 through the third hydrogen supply pipeline 130 until P 01 ≤P1.

[0069] In step S302, P1 is a set value, for example, it can be the minimum critical pressure for normal supply of hydrogen to the fuel cell 200, and the controller 190 compares P 01 and P1, in P 01 When the pressure of hydrogen recovered in the gas tank 134 is greater than P1, it is considered that the pressure of hydrogen recovered in the gas tank 134 is large enough to drive a sufficient amount of hydrogen to be supplied to the fuel cell 200. Therefore, the controller 190 controls the third electronically controlled valve 136 at the output end of the gas tank 134 to open, so that the hydrogen recovered in the gas tank 134 is used as a gas source to provide raw materials for the fuel cell 200. 01 When ≤P1, it is considered that the pressure of the hydrogen recovered in the gas tank 134 is insufficient to provide the hydrogen required for the operation of the fuel cell 200. Therefore, the controller 190 controls the third electronically controlled valve to close and stops the third hydrogen supply pipeline 130 from supplying hydrogen to the fuel cell 200.

[0070] S303, in P01 P2, the second gas pressure P 02 ;

[0071] P2, the second gas pressure P 01 P1, the controller 190 acquires the second gas pressure P 02 in the gas phase in the liquid hydrogen tank 180 detected by the second pressure sensor, and determines to use the second hydrogen supply line 120 and / or the first hydrogen supply line 110 as the hydrogen supply line according to the second gas pressure P 02 .

[0072] S304, if P 02 >P2, the second electric control valve 121 is controlled to open the second hydrogen supply line 120 so that the gas in the liquid hydrogen tank 180 is supplied to the fuel cell 200 through the second hydrogen supply line 120; if P 02 P2, the first electric control valve 111 is controlled to open the first hydrogen supply line 110 so that the liquid in the liquid hydrogen tank 180 is supplied to the fuel cell 200 through the first hydrogen supply line 110.

[0073] In step S304, P2 is a set value, for example, it can be the minimum critical pressure for the gas in the liquid hydrogen tank 180 to normally supply hydrogen to the fuel cell 200. The controller 190 compares P 02 with P2, if P 02 >P2, it is considered that the hydrogen pressure in the liquid hydrogen tank 180 is large enough to drive a sufficient amount of hydrogen to be supplied to the fuel cell 200, so the controller 190 controls the third electric control valve to be closed, the third hydrogen supply line 130 is cut off, the second electric control valve 121 is controlled to be opened, and the second hydrogen supply line 120 is turned on, so that the hydrogen in the liquid hydrogen tank 180 provides raw materials for the fuel cell 200 as a gas source. If P 02 P2, it is considered that the hydrogen pressure in the liquid hydrogen tank 180 is not enough to provide the hydrogen required by the fuel cell 200, so the controller 190 controls the second electric control valve 121 to be closed, the second hydrogen supply line 120 is cut off, and the first electric control valve 111 is controlled to be opened, and the first hydrogen supply line 110 is turned on, so that the liquid hydrogen in the liquid hydrogen tank 180 provides raw materials for the fuel cell 200 as a gas source.

[0074] That is, the supply structure of the fuel cell 200 gives priority to the gas tank 134 of the third hydrogen supply pipeline 130, then to the second hydrogen supply pipeline 120, that is, the gas phase in the liquid hydrogen bottle 180, and finally to the first hydrogen supply pipeline 110, that is, the liquid phase in the liquid hydrogen bottle 180. This supply mode gives priority to the use of recovered hydrogen, reduces the pressure in the gas tank 134, provides storage space for the next hydrogen recovery, and realizes the maximum recovery and utilization of hydrogen in the liquid hydrogen bottle 180.

[0075] In order to improve the utilization rate of the gas phase in the liquid hydrogen bottle 180 and ensure the stability of the hydrogen supply of the fuel cell 200, the P 02 ≤P2, the first electric control valve 111 is controlled to open the first hydrogen supply pipeline 110 to supply the liquid in the liquid hydrogen bottle 180 to the fuel cell 200 through the first hydrogen supply pipeline 110. It can also specifically include:

[0076] In the case of P3≤P 02 ≤P2, the first electric control valve 111 is controlled to open the first hydrogen supply pipeline 110, and the second electric control valve 121 is controlled to open the second hydrogen supply pipeline 120, so that the liquid in the liquid hydrogen bottle 180 is supplied to the fuel cell 200 through the first hydrogen supply pipeline 110, and the gas in the liquid hydrogen bottle 180 is supplied to the fuel cell 200 through the second hydrogen supply pipeline 120; in the case of P 02 <P3, the first electric control valve 111 is controlled to open the first hydrogen supply pipeline 110 to supply the liquid in the liquid hydrogen bottle 180 to the fuel cell 200 through the first hydrogen supply pipeline 110.

[0077] In this step, P3 is a set value, P3 02 ≤P2, that is, the second gas pressure P 02 When the hydrogen pressure in the liquid hydrogen bottle 180 is not enough to provide the required hydrogen for the fuel cell 200 alone, but the hydrogen in the liquid hydrogen bottle 180 still has utilization value when the hydrogen pressure in the liquid hydrogen bottle 180 is in the range of P3 to P2, the second electric control valve 121 is kept open, the hydrogen in the liquid hydrogen bottle 180 is supplied to the fuel cell 200 through the second hydrogen supply pipeline 120, the controller 190 also controls the first electric control valve 111 to open, and controls the power output 114 to work, so that the liquid hydrogen in the liquid hydrogen bottle 180 is supplied to the fuel cell 200 through the first hydrogen supply pipeline 110. That is, when the second gas pressure P 02Within a range that is not large enough but still has utilization value, the hydrogen gas and liquid hydrogen in the liquid hydrogen bottle 180 are simultaneously used as raw materials for the fuel cell 200 and are supplied to the fuel cell 200 through the second hydrogen supply pipeline 120 and the first hydrogen supply pipeline 110, respectively, further improving the utilization rate of the hydrogen in the liquid hydrogen bottle 180. It should be noted that when the second hydrogen supply pipeline 120 and the first hydrogen supply pipeline 110 jointly supply hydrogen, the gas phase pressure in the liquid hydrogen bottle 180 will gradually decrease. The power output component 114 is a variable frequency power output component 114, and its output power can be adjusted as needed to keep the total hydrogen supplied by the first hydrogen supply pipeline 110 and the second hydrogen supply pipeline 120 unchanged, thereby improving both the stability of the hydrogen supply and the utilization rate of the hydrogen.

[0078] In P 02 When the pressure is less than P3, it is considered that the gas phase pressure in the liquid hydrogen bottle 180 is very low and recovery is of little significance. The controller 190 controls the second electrically controlled valve 121 to close, thereby blocking the second hydrogen supply line 120. The controller 190 controls the first electrically controlled valve 111 to remain open, thereby connecting the first hydrogen supply line 110, so that the liquid in the liquid hydrogen bottle 180 is supplied to the fuel cell 200 through the first hydrogen supply line 110.

[0079] The control method of the on-board liquid hydrogen system 100 provided in the third aspect of the present application may be performed by the controller 190 of the on-board liquid hydrogen system 100. The controller 190 performs steps S301, S302, S303, and S304 of the control method, that is, the controller 190 responds to the start signal of the fuel cell 200 to obtain the first gas pressure P of the gas tank 134. 01 , in P 01 >P1, the controller 190 controls the third electronically controlled valve 136 at the output end of the gas tank 134 to conduct the third hydrogen supply pipeline 130, so that the gas in the gas tank 134 is supplied to the fuel cell 200 through the third hydrogen supply pipeline 130 until P 01 ≤P1, in P 01 ≤P1, obtain the second gas pressure P of the gas phase in the liquid hydrogen bottle 180 02 , in P 02 >P2, the controller 190 controls the second electronically controlled valve 121 to conduct the second hydrogen supply pipeline 120, so that the gas in the liquid hydrogen bottle 180 is supplied to the fuel cell 200 through the second hydrogen supply pipeline 120; 02 When P2 is less than or equal to P2, the first electronically controlled valve 111 is controlled to conduct the first hydrogen supply pipeline 110 , so that the liquid in the liquid hydrogen bottle 180 is supplied to the fuel cell 200 through the first hydrogen supply pipeline 110 .

[0080] More specifically, the controller 190 may also 01 ≤P1 and P3≤P 02≤P2, the first electrically controlled valve 111 is controlled to conduct the first hydrogen supply pipeline 110, and the second electrically controlled valve 121 is controlled to conduct the second hydrogen supply pipeline 120, so that the liquid in the liquid hydrogen bottle 180 is supplied to the fuel cell 200 through the first hydrogen supply pipeline 110, and the gas in the liquid hydrogen bottle 180 is supplied to the fuel cell 200 through the second hydrogen supply pipeline 120; the controller 190 can also 01 ≤P1 and P 02 When the pressure is less than P3, the first electrically controlled valve 111 is controlled to open the first hydrogen supply line 110 so that the liquid in the liquid hydrogen bottle 180 is supplied to the fuel cell 200 through the first hydrogen supply line 110.

[0081] A fourth embodiment of the present application provides a control method for the on-vehicle liquid hydrogen system 100 provided with a compression assembly according to the first embodiment.

[0082] The control method of the vehicle-mounted liquid hydrogen system 100 provided in this embodiment is actually a method for recovering hydrogen in the liquid hydrogen bottle 180. Figure 4 , the specific steps of the control method include:

[0083] S401, in response to the fuel cell 200 shutdown signal, obtain the second gas pressure P of the gas phase in the liquid hydrogen bottle 180 02 .

[0084] When the fuel cell 200 is not working, the controller 190 obtains the second gas pressure P of the gas phase in the liquid hydrogen bottle 180 detected by the second pressure sensor. 02 The pressure of hydrogen gas after evaporation of liquid hydrogen in the liquid hydrogen bottle 180 is used as the basis for determining whether to recycle it. It should also be noted that when the fuel cell 200 is shut down, the main electronically controlled valve 118 of the first hydrogen supply pipeline 110 and the third electronically controlled valve 136 at the output end of the gas tank 134 are in the closed state.

[0085] S402, in P 02 >P4 and P 02 >P 01 In the case of P, the third electrically controlled valve 131 at the input end of the gas tank 134 is controlled to conduct the third hydrogen supply pipeline 130, so that the gas in the liquid hydrogen bottle 180 is stored in the gas tank 134 through the third hydrogen supply pipeline 130; 02 >P4 and P 02 ≤P 01 In this case, the third electrically controlled valve 131 at the input end of the gas tank 134 is controlled to conduct the third hydrogen supply pipeline 130, and the compression assembly is operated so that the gas in the liquid hydrogen bottle 180 is compressed and stored in the gas tank 134 through the third hydrogen supply pipeline 130 until P 01 >P5 and / or P 02<P4, where P4 is the set value and P5 is the designed maximum pressure of the gas tank 134.

[0086] In step S402, P4 can be the minimum critical value of the hydrogen pressure in the liquid hydrogen bottle 180 that needs to release the pressure value gas tank 134. If P 02 >P4, it is considered that the hydrogen pressure in the liquid hydrogen bottle 180 is too high, and the controller 190 controls the third electrically controlled valve 131 located at the input end of the gas tank 134 to open, and the hydrogen in the liquid hydrogen bottle 180 flows along the third electrically controlled valve 131 located at the input end of the gas tank 134 to be stored in the gas tank 134. After the hydrogen pressure in the liquid hydrogen bottle 180 is equal to the pressure in the gas tank 134, the gas pressure in the liquid hydrogen bottle 180 no longer changes (P 02 The gas phase pressure in the liquid hydrogen bottle 180 is equal to the gas phase pressure in the gas tank 134 (P 02 =P 01 ), hydrogen cannot actively flow from the liquid hydrogen bottle 180 to the gas tank 134. At this time, the controller 190 controls the compression assembly to work. Specifically, the controller 190 controls the driving member 132 to work, thereby driving the compressor 133 to work, so that the hydrogen is compressed and stored in the gas tank 134. If there is still hydrogen in the gas tank 134 before it is recycled, the gas pressure in the gas tank 134 may be greater than the gas pressure in the liquid hydrogen tank (P 01 >P 02 ), and at this time the pressure limit (P5) of the gas tank 134 has not been reached, the driving member 132 is also turned on, so that the hydrogen in the liquid hydrogen tank is compressed and stored in the gas tank 134. In the process of the gas tank 134 recovering the hydrogen in the liquid hydrogen bottle 180, when the gas tank 134 reaches its own capacity limit, that is, P 01 >P5, and / or, the pressure in the liquid hydrogen bottle 180 is too low, that is, P 02 When the pressure is less than P4, the controller 190 controls the driving member 132 to stop working, and controls the third electrically controlled valve 131 located at the input end of the gas tank 134 to close, and the recovery of hydrogen in the liquid hydrogen bottle 180 is completed.

[0087] The control method of the on-board liquid hydrogen system 100 provided in the fourth aspect of the present application may be performed by the controller 190 of the on-board liquid hydrogen system 100. The controller 190 performs steps S401 and S402 of the control method. 02 >P4 and P 02 >P 01 In the case of P, the controller 190 controls the third electrically controlled valve 131 at the input end of the gas tank 134 to conduct the third hydrogen supply pipeline 130, so that the gas in the liquid hydrogen bottle 180 is stored in the gas tank 134 through the third hydrogen supply pipeline 130; 02 >P4 and P 02 ≤P 01In this case, the controller 190 controls the third electrically controlled valve 131 at the input end of the gas tank 134 to conduct the third hydrogen supply pipeline 130, and the compression assembly to operate, so that the gas in the liquid hydrogen bottle 180 is compressed through the third hydrogen supply pipeline 130 and stored in the gas tank 134 until P 01 >P5 and / or P 02 <P4.

[0088] The vehicle-mounted liquid hydrogen system 100, control method, and vehicle provided in this application have at least the following advantages:

[0089] (1) The pipelines of the traditional on-board liquid hydrogen system 100 are simplified, and the reduced self-pressurization pipeline is replaced by the power output component 114 (cryogenic submersible pump) in the first hydrogen supply pipeline. The flow rate can adjust the supply speed of liquid hydrogen according to the pressure inside the liquid hydrogen bottle 180 and the working conditions of the vehicle, which solves the problem that the self-pressurization system is too slow to pressurize during use, resulting in insufficient gas supply from the hydrogen storage system when the pressure in the on-board liquid hydrogen bottle 180 is lower than the normal value, resulting in insufficient power of the fuel cell 200 system and the inability of the vehicle to work normally.

[0090] (2) A recovery pipeline is set at the vent interface Vv. When the gas phase pressure inside the liquid hydrogen bottle 180 is too high, the pressure is collected in the gas tank 134. When the vehicle is working, the hydrogen in the gas tank 134 is preferentially supplied to the fuel cell 200. This can greatly reduce the emission of hydrogen into the air, reduce safety hazards, and reduce energy waste.

[0091] (3) The provision of the quick-connect interface and the socket connector 170 can facilitate the removal or addition of the third hydrogen supply pipeline 130 from the entire system, and at the same time facilitate the emptying operation.

[0092] (4) By detecting the gas phase pressure inside the liquid hydrogen bottle 180 and the pressure inside the gas tank 134, the simplified second hydrogen supply pipeline 120 and the power output component 114 of the first hydrogen supply pipeline 110 are combined to reduce leakage hot spots and the conversion of liquid hydrogen into gaseous hydrogen, thereby improving the stability of fuel supply during the operation of the fuel cell 200 system and ensuring the power of the fuel-electric system.

[0093] (5) Control the vehicle to recover the hydrogen in the liquid hydrogen bottle 180 and store it in the gas tank 134 for recovery, so as to avoid the safety hazards and energy waste caused by the direct release of high-pressure gas into the air when the fuel cell 200 is not working.

[0094] (6) The control system obtains the gas phase pressure in the gas tank and the liquid hydrogen bottle in real time, and judges and controls the opening timing of the first hydrogen supply pipeline, the second hydrogen supply pipeline, and the third hydrogen supply pipeline according to the two pressure values, thereby effectively utilizing the hydrogen formed by the evaporation of liquid hydrogen in the liquid hydrogen bottle, reducing energy consumption, and avoiding the direct discharge of hydrogen in the liquid hydrogen bottle.

[0095] In this application, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0096] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise" and "counterclockwise" indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do 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 should not be understood as a limitation on the present application.

[0097] In this application, unless otherwise specified or limited, the terms "connect," "fix," etc. should be understood broadly. For example, "fix" can mean fixed connection, detachable connection, or integration; it can mean mechanical connection or electrical connection; it can mean direct connection or indirect connection through an intermediate medium; it can mean internal communication between two elements or interaction between two elements. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0098] In addition, the terms "first," "second," and so on, used in this application are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, features specified as "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, "plurality" means two or more, unless otherwise specifically defined.

[0099] Although the embodiments of the present application have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions, and variations may be made to the embodiments without departing from the principles and intent of the present application, and that the scope of the present application is defined by the claims and their equivalents.

Claims

1. A vehicle-mounted liquid hydrogen system, characterized in that: include: Liquid hydrogen bottle, used to store liquid hydrogen; a first hydrogen supply pipeline, the input end of which is connected to the liquid phase outlet of the liquid hydrogen bottle, and the output end of which is used to connect to the fuel cell, and the first hydrogen supply pipeline is provided with a first electronically controlled valve; a second hydrogen supply pipeline, the input end of which is connected to the gas phase outlet of the liquid hydrogen bottle, the output end of which is connected to the first hydrogen supply pipeline and is close to the output end of the first electronically controlled valve; the second hydrogen supply pipeline is provided with a second electronically controlled valve; A third hydrogen supply pipeline, the input end of which is connected to the gas phase outlet of the liquid hydrogen bottle, and the output end of which is connected to the first hydrogen supply pipeline and is close to the output end of the first electrically controlled valve. The third hydrogen supply pipeline is provided with a connected gas tank and a third electrically controlled valve. There are two third electrically controlled valves, which are respectively located at the input end and the output end of the gas tank; a first pressure sensor, configured to detect the gas pressure in the gas tank; a second pressure sensor, configured to detect the gas phase pressure in the liquid hydrogen bottle; The controller is electrically connected to the first electric control valve, the second electric control valve, the third electric control valve, the first pressure sensor and the second pressure sensor; the controller is configured to: 01 >P1, the controller controls the third electronically controlled valve located at the output end of the gas tank to open, so that the gas in the gas tank is supplied to the fuel cell through the third hydrogen supply pipeline; 01 ≤P1 and the second gas pressure P of the gas phase in the liquid hydrogen bottle 02 >P2, the controller controls the second electronically controlled valve to open, so that the gas in the liquid hydrogen bottle is supplied to the fuel cell through the second hydrogen supply pipeline; 01 ≤P1 and P 02 When P1 is less than or equal to P2, the controller controls the first electronically controlled valve to open, so that the liquid in the liquid hydrogen bottle is supplied to the fuel cell through the first hydrogen supply pipeline; wherein P1 and P2 are both set values.

2. The vehicle-mounted liquid hydrogen system according to claim 1, characterized in that: The third hydrogen supply pipeline includes a compression component for compressing the gas in the gas tank, and the compression component is electrically connected to the controller.

3. The vehicle-mounted liquid hydrogen system according to claim 2, characterized in that: The compression assembly includes a compressor and a driving member, the driving member is transmission-connected to the compressor, the compressor is connected to the gas tank and is close to the liquid hydrogen bottle, and the driving member is electrically connected to the controller.

4. The vehicle-mounted liquid hydrogen system according to any one of claims 1 to 3, characterized in that: The first hydrogen supply pipeline is provided with a power output component, a vaporizer and a buffer tank. The first electrically controlled valve, the power output component, the vaporizer and the buffer tank are connected in sequence along the medium flow direction. The output end of the third hydrogen supply pipeline is connected to the buffer tank, and the power output component is electrically connected to the controller.

5. The vehicle-mounted liquid hydrogen system according to any one of claims 1 to 3, characterized in that: It also includes a liquid filling pipeline and a discharge pipeline, and the liquid filling pipeline and the discharge pipeline are both connected to the gas phase outlet of the liquid hydrogen bottle through a main pipe.

6. A vehicle, characterized in that: The vehicle-mounted liquid hydrogen system comprises the vehicle-mounted liquid hydrogen system according to any one of claims 1 to 5.

7. A control method for a vehicle-mounted liquid hydrogen system according to any one of claims 1 to 5, characterized in that: include: In response to the fuel cell start-up signal, the first gas pressure P of the gas tank is obtained. 01 ; In P 01 >P1, the third electronically controlled valve at the output end of the gas tank is controlled to conduct the third hydrogen supply pipeline, so that the gas in the gas tank is supplied to the fuel cell through the third hydrogen supply pipeline until P 01 ≤P1; In P 01 When ≤P1, obtain the second gas pressure P of the gas phase in the liquid hydrogen bottle 02 ; In P 02 >P2, the second electronically controlled valve is controlled to conduct the second hydrogen supply pipeline, so that the gas in the liquid hydrogen bottle is supplied to the fuel cell through the second hydrogen supply pipeline; wherein P1 and P2 are both set values; in P 02 When the pressure is less than or equal to P2, the first electronically controlled valve is controlled to conduct the first hydrogen supply pipeline, so that the liquid in the liquid hydrogen bottle is supplied to the fuel cell through the first hydrogen supply pipeline.

8. The control method of the vehicle-mounted liquid hydrogen system according to claim 7, characterized in that: In P 02 When the pressure is less than or equal to P2, the first electronically controlled valve is controlled to conduct the first hydrogen supply pipeline, so that the liquid in the liquid hydrogen bottle is supplied to the fuel cell through the first hydrogen supply pipeline, specifically including: When P3≤P 02 When P<=P2, the first electrically controlled valve is controlled to conduct the first hydrogen supply pipeline, and the second electrically controlled valve is controlled to conduct the second hydrogen supply pipeline, so that the liquid in the liquid hydrogen bottle is supplied to the fuel cell through the first hydrogen supply pipeline, and the gas in the liquid hydrogen bottle is supplied to the fuel cell through the second hydrogen supply pipeline; wherein P3 is the set value, P3<P2; In P 02 When the pressure is less than P3, the first electronically controlled valve is controlled to conduct the first hydrogen supply pipeline, so that the liquid in the liquid hydrogen bottle is supplied to the fuel cell through the first hydrogen supply pipeline.

9. A control method for the vehicle-mounted liquid hydrogen system according to claim 2 or 3, characterized in that: include: In response to the fuel cell shutdown signal, the second gas pressure P of the gas phase in the liquid hydrogen bottle is obtained. 02 ; In P 02 >P4 and P 02 >P 01 In the case of P, the third electronically controlled valve at the input end of the gas tank is controlled to conduct the third hydrogen supply pipeline, so that the gas in the liquid hydrogen bottle is stored in the gas tank through the third hydrogen supply pipeline; 02 >P4 and P 02 ≤P 01 In this case, the third electrically controlled valve at the input end of the gas tank is controlled to conduct the third hydrogen supply pipeline, and the compression assembly is operated so that the gas in the liquid hydrogen bottle is compressed and stored in the gas tank through the third hydrogen supply pipeline until P 01 >P5 and / or P 02 <P4, where P4 is the set value and P5 is the designed maximum pressure of the gas tank.

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