Vehicle-mounted liquid hydrogen system, control method and vehicle

Abstract

The invention discloses a vehicle-mounted liquid hydrogen system, a control method and a vehicle. The technical problems of energy waste and safety caused by direct release of vaporized hydrogen in a liquid hydrogen bottle in the prior art are solved. The vehicle-mounted liquid hydrogen system comprises a liquid hydrogen bottle; the input end of the first hydrogen supply pipeline is communicated with a liquid phase outlet of the liquid hydrogen bottle, the output end of the first hydrogen supply pipeline is communicated with a fuel cell, and the first hydrogen supply pipeline is provided with a first electric control valve; the input end of the second hydrogen supply pipeline is communicated with the gas phase outlet of the liquid hydrogen bottle, the output end of the second hydrogen supply pipeline is communicated with the first hydrogen supply pipeline, and the second hydrogen supply pipeline is provided with a second electric control valve; the input end of the third hydrogen supply pipeline is communicated with a gas phase outlet of the liquid hydrogen bottle, the output end of the third hydrogen supply pipeline is communicated with the first hydrogen supply pipeline, the third hydrogen supply pipeline is provided with a gas tank and two third electric control valves which are communicated, and the two third electric control valves are located at the input end and the output end of the gas tank respectively. According to the vehicle-mounted liquid hydrogen system, vaporized hydrogen in the liquid hydrogen bottle is recycled and utilized, and the energy utilization rate is increased.

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 and a control method, and a vehicle. Background Art

[0002] In the on-board liquid hydrogen system, the storage temperature of liquid hydrogen is very low. When the vehicle is working, the liquid hydrogen bottle needs to continuously provide fuel to the fuel-electric system, and the hydrogen supply pipeline needs a certain pressure to ensure the fuel supply of liquid hydrogen. When the liquid hydrogen in the liquid hydrogen bottle vaporizes due to heat absorption, and the pressure in the liquid hydrogen bottle reaches a certain value, the hydrogen needs to be released through the safety valve, which not only wastes energy, but also directly discharges the vaporized hydrogen into the air, and there are certain safety hazards. Summary of the invention

[0003] In order to solve the energy waste and safety technical problems caused by the direct discharge of vaporized hydrogen in the 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, a vehicle-mounted liquid hydrogen system is provided, 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, whose input end is connected to the gas phase outlet of the liquid hydrogen bottle, and whose output end is connected to the first hydrogen supply pipeline and close to the output end of the first electric control valve, and the second hydrogen supply pipeline is provided with a second electric control 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 electric-controlled valve. The third hydrogen supply pipeline is provided with a connected gas tank and a third electric-controlled valve. Two third electric-controlled valves are provided, and the two third electric-controlled valves are respectively located at the input end and the output end of the gas tank;

[0009] A first pressure sensor, used to detect the gas pressure in the gas tank;

[0010] A second pressure sensor is used 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 drivingly 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 electric control 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: when the first gas pressure P of the gas tank 01 >P1, the controller controls the third electrically 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; in P 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; in P 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 vehicle-mounted liquid hydrogen system applied 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 ≤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; when P 02 When P≤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 ≤P2, control the first electronically controlled valve to conduct the first hydrogen supply pipeline, and the second electronically controlled valve 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 a set value, P3<P2;

[0025] In P 02 When the pressure drops below P3, the first electrically 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 vehicle-mounted liquid hydrogen system applied 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 electric control valve located 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 the case of P, the third electric control 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-vehicle 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 setting a first hydrogen supply pipeline and a first electrically controlled valve on the first hydrogen supply pipeline, liquid hydrogen in the liquid hydrogen bottle can be supplied to the fuel cell. By setting a second hydrogen supply pipeline and a second electrically controlled valve on the second hydrogen supply pipeline, hydrogen in the liquid hydrogen bottle can be supplied to the fuel cell. By setting a third hydrogen supply pipeline and a gas tank and two third electrically controlled valves on the third hydrogen supply pipeline, hydrogen formed 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 realizing 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 acquired 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, the energy consumption is reduced, the safety hazard caused by the direct discharge of hydrogen in the liquid hydrogen bottle is avoided, the stable operation of the fuel cell is ensured, and the endurance of the fuel cell vehicle is effectively improved.

[0032] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the 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 Shows 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 a vehicle-mounted 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-on-board 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 member, 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-driving 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-filling pipeline, 141-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 make the technical personnel in the technical field to which the present application belongs to understand the present application more clearly, the technical scheme 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 the field without creative work are within the scope of protection of the present application.

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

[0042] See also Figure 1 as well as Figure 2 The on-board liquid hydrogen system 100 provided in the 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, and 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 economical 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 end and the output end 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 formed 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. That is to say, 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, so that the hydrogen in the liquid hydrogen bottle 180 can be temporarily stored in the gas tank 134, thereby realizing the recovery of hydrogen in the liquid hydrogen bottle 180; 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, so that 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, so as to judge whether the gas tank 134 has the ability to store and recover the hydrogen formed by evaporation of liquid hydrogen in the 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 recovery demand 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 pipeline 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 electric control valve 111 is close to the input end of the power output member 114, and the output end of the third hydrogen supply pipeline 130 is connected to the buffer tank 116. The power output member 114 can adopt a power pump, such as a cryogenic submersible pump, which can provide the power for the liquid hydrogen in the liquid hydrogen bottle 180 to flow in the first hydrogen supply pipeline 110, and does not rely on other booster pipelines. Even if the liquid hydrogen in the liquid hydrogen bottle 180 vaporizes to form hydrogen gas, resulting in large pressure fluctuations in the liquid hydrogen bottle 180, the stability of the first hydrogen supply pipeline 110 supplying hydrogen 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 form requirements of the fuel cell 200 for the raw materials. The buffer tank 116 can buffer the hydrogen gas, further improving the stability of hydrogen supply to the fuel cell 200. In a specific implementation, the output end of the second hydrogen supply pipeline 120 can be located between the first electric control valve 111 and the power output member 114, so as to realize the separate hydrogen supply of the first hydrogen supply pipeline 110 and the second hydrogen supply pipeline 120. Of course, the output end of the second hydrogen supply pipeline 120 can also be directly connected to the buffer tank 116, so that the first hydrogen supply pipeline 110 and the second hydrogen supply pipeline 120 can also supply hydrogen to the fuel cell 200 separately. In other embodiments, the first hydrogen supply pipeline 110 may not be provided with a power output member 114, and the liquid hydrogen can be driven to circulate in the first hydrogen supply pipeline 110 by the pressure difference in the liquid hydrogen bottle 180 itself. In another embodiment, the output end of the second hydrogen supply pipeline 120 can also be connected to the output end of the vaporizer 115, and the vaporized hydrogen can flow back to the liquid hydrogen bottle 180 through the second hydrogen supply pipeline 120 to increase the pressure difference, thereby driving the liquid hydrogen to flow in the first hydrogen supply pipeline 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 pipeline.

[0051] See also Figure 1The first hydrogen supply pipeline 110 also includes a first one-way valve 112, a flow regulating valve 113, a pressure regulating valve 117 and a main electric control valve 118. The first electric control valve 111, the first one-way valve 112, the flow regulating valve 113, the power output part 114, the buffer tank 116, the pressure regulating valve 117 and the main electric control valve 118 are arranged in sequence along the medium flow direction. The first one-way valve 112 is arranged on the first hydrogen supply pipeline 110, so that liquid hydrogen can only flow from the first electric control valve 111 to the power output part 114 without reverse flow. The flow regulating valve 113 realizes the flow regulation of the supplied liquid hydrogen or the hydrogen flowing through the second hydrogen supply pipeline 120, and the pressure regulating valve 117 and the buffer tank 116 cooperate to stabilize the pressure of the hydrogen flowing through. 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; it can be opened when the fuel cell 200 is started 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 The gas tank 134 may be a common gas tank or a high-pressure BOG storage tank. When the gas tank 134 is a high-pressure BOG storage tank, the third hydrogen supply pipeline 130 further includes a compression component for compressing the gas in the gas tank 134. The compression component is electrically connected to the controller 190, so that when the gas tank 134 recovers hydrogen, the gas can be compressed when the gas pressure in the gas tank 134 is equal to that in the liquid hydrogen bottle 180, thereby improving the recovery capacity of the gas in the liquid hydrogen bottle 180, increasing the pressure of the recovered hydrogen in the gas tank 134, and at the same time ensuring that the gas tank 134 has sufficient gas pressure to supply hydrogen to the fuel cell 200, thereby improving the stability of supplying hydrogen to the fuel cell 200. In other embodiments, the third hydrogen supply pipeline 130 may not be provided with a compression component, and the hydrogen formed by the evaporation of liquid hydrogen in the liquid hydrogen bottle 180 can still be temporarily stored in the gas tank 134.

[0053] Please continue reading Figure 1 In some embodiments, the compression assembly includes a compressor 133 and a driving member 132. The driving member 132, such as a motor, is in transmission connection with the compressor 133 to enable the compressor 133 to work. The compressor 133 is connected to the gas tank 134 and is close to the liquid hydrogen bottle 180, so that the compressed high-pressure gas is stored in the gas tank 134. The compressor 133 can be a gas compressor 133 or an air compressor 133, etc. For more information, please refer to the prior art disclosure, which will not be repeated in this application.

[0054] In some embodiments, the input end and the output end 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 matching the first quick-connect interface. The first quick-connect interface of the input end is detachably connected to the second quick-connect interface on the side of the vent valve 160, and the first quick-connect interface of the output section is detachably connected to the second quick-connect interface on the side of the buffer tank 116, 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 pipeline 130 is also 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 electric control valve 136 located at the output end of the gas tank 134. That is, two second electric control valves 121, one is located at the input end of the gas tank 134, and the other is located at the output end of the one-way valve, so that the problem of hydrogen backflow will not occur when the gas tank 134 supplies hydrogen to the fuel cell 200. The pressure reducing valve 137 is connected to the third electric control valve 136 located at the output end of the gas tank 134 and is close to the buffer tank 116 to reduce the pressure of the high-pressure hydrogen in the gas tank 134 and supply it to the fuel cell 200.

[0056] Please continue reading Figure 1 The third electrically controlled valve and the driving member 132 on the third hydrogen supply pipeline 130 are electrically connected to the controller 190 through the socket connector 170. The socket connector 170 is provided to facilitate the addition and removal of the third hydrogen supply pipeline 130 from the entire vehicle-mounted liquid hydrogen system 100. In a specific implementation, the socket connector 170 that can correspond to the driving member 132 and the two third electrically controlled valves can also be provided on one socket connector 170. Interfaces that are electrically connected to the driving member 132 and the two third electrically controlled valves can also be provided on the one socket connector 170.

[0057] Please continue reading Figure 1 The on-board liquid hydrogen system 100 also includes a discharge pipeline 150 and a filling pipeline 140. The 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 the vaporization of liquid hydrogen.

[0058] A safety valve is provided on the discharge pipeline 150, which is used to release the hydrogen in the liquid hydrogen bottle 180 when the pressure is too high but the recovery conditions are not met. For example, when the hydrogen recovered in the gas tank 134 has reached its own pressure limit, and 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 gas phase pressure in the liquid hydrogen bottle 180 is too high during parking of the vehicle and exceeds 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 the main safety valve 151, and the other is the auxiliary safety valve 152. The main safety valve 151 and the auxiliary 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 liquid filling check valve 141 is provided on the liquid filling pipeline 140, so that the liquid hydrogen in the liquid filling pipeline 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 pipeline 140. In addition, the input end of the liquid filling pipeline 140 forms a liquid filling port, which can be connected to the structure containing liquid hydrogen, so that the liquid hydrogen in the structure containing liquid hydrogen flows into the liquid hydrogen bottle 180 through the liquid filling pipeline 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] A second aspect of the present application provides a vehicle, comprising the on-board liquid hydrogen system 100 of any embodiment of the first aspect.

[0062] The vehicle having the on-board liquid hydrogen system 100 of the first aspect realizes the recycling 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 a vehicle-mounted liquid hydrogen system 100 applied to any implementation scheme of the first aspect, and the control method for the vehicle-mounted 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 a 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-up 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. The controller 190 compares P 01 and P1, in P 01 In the case of >P1, it is considered that the pressure of the 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 electric control 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 ≤P1, obtain the second gas pressure P of the gas phase in the liquid hydrogen bottle 180 02 ;

[0071] Because P 01 ≤P1, the gas tank 134 does not have the pressure to supply the required hydrogen to the fuel cell 200. At this time, 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 , considering the second gas pressure P 02 To determine whether to use the second hydrogen supply pipeline 120 and / or the first hydrogen supply pipeline 110 as the hydrogen supply pipeline.

[0072] S304, in P 02 >P2, the second electronically controlled valve 121 is controlled 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 .

[0073] In step S304, P2 is a set value, for example, it can be the minimum critical pressure for the normal supply of hydrogen to the fuel cell 200 by means of the gas in the liquid hydrogen bottle 180. The controller 190 compares P 02 With P2, in P 02 In the case of >P2, it is considered that the hydrogen pressure in the liquid hydrogen bottle 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 electronically controlled valve to close, the third hydrogen supply pipeline 130 to be cut off, and controls the second electronically controlled valve 121 to open, the second hydrogen supply pipeline 120 to be connected, so that the hydrogen in the liquid hydrogen bottle 180 is used as a gas source to provide raw materials for the fuel cell 200. 02 When the pressure is less than or equal to P2, it is considered that the hydrogen pressure in the liquid hydrogen bottle 180 is insufficient to provide the hydrogen required by the fuel cell 200. Therefore, the controller 190 controls the second electrically controlled valve 121 to close, the second hydrogen supply pipeline 120 to be cut off, and the first electrically controlled valve 111 to be opened, and the first hydrogen supply pipeline 110 to be connected, so that the liquid hydrogen in the liquid hydrogen bottle 180 is used as a gas source to provide raw materials for the fuel cell 200.

[0074] That is to say, the supply structure of the fuel cell 200 gives priority to the gas tank 134 of the third hydrogen supply pipeline 130, followed by the second hydrogen supply pipeline 120, that is, the gas phase in the liquid hydrogen bottle 180, and finally considers the first hydrogen supply pipeline 110, that is, the liquid phase in the liquid hydrogen bottle 180. This supply method gives priority to the use of recycled 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 to the fuel cell 200, the step S304 02 ≤P2, controlling the first electronically controlled valve 111 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, may also specifically include:

[0076] When 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; when P 02 When P<P3, 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.

[0077] In this step, P3 is a set value, P3<P2, for example, P3 is the minimum pressure of hydrogen recovery in the liquid hydrogen bottle 180, and when P3≤P 02 ≤P2, that is, the second gas pressure P of the gas phase in the liquid hydrogen bottle 180 02 When it is in the range of P3 to P2, although the hydrogen pressure in the liquid hydrogen bottle 180 is not enough to provide the hydrogen required by the fuel cell 200 alone, the hydrogen in the liquid hydrogen bottle 180 is still useful. At this time, the second electric control valve 121 remains open, and 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 member 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 to say, when the second gas pressure P of the gas phase in the liquid hydrogen bottle 180 is 02In the 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 respectively supplied to the fuel cell 200 through the second hydrogen supply pipeline 120 and the first hydrogen supply pipeline 110, thereby 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, and the power output part 114 is a variable frequency power output part 114, and its output power can be adjusted as needed to keep the sum of the hydrogen supplied by the first hydrogen supply pipeline 110 and the second hydrogen supply pipeline 120 unchanged, thereby improving both the stability of hydrogen supply and the utilization rate of 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 small and the recovery is of little significance. The controller 190 controls the second electrically controlled valve 121 to close to cut off the second hydrogen supply pipeline 120. The controller 190 controls the first electrically controlled valve 111 to remain open 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.

[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 a 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 obtains the first gas pressure P of the gas tank 134 in response to the start signal of the fuel cell 200. 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 control the first electrically controlled valve 111 to conduct the first hydrogen supply pipeline 110, and the second electrically controlled valve 121 to conduct the second hydrogen supply pipeline 120. 01 ≤P1 and P 02 When P<P3, 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.

[0081] A fourth embodiment of the present application provides a control method for the on-board liquid hydrogen system 100 provided with a compression component 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, obtaining 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 the liquid hydrogen in the liquid hydrogen bottle 180 when it evaporates into hydrogen gas is used as the basis for whether to recycle. It should also be noted that when the fuel cell 200 is turned off, the main electric control valve 118 of the first hydrogen supply pipeline 110 and the third electric control valve 136 at the output end of the gas tank 134 are in a 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 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, 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, wherein P4 is a set value and P5 is a designed maximum pressure of the gas tank 134.

[0086] In step S402, P4 may be the minimum critical value at which the hydrogen pressure in the liquid hydrogen bottle 180 rises to the pressure value gas tank 134 that needs to release the pressure. 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 drive 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 recycling, 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 the pressure limit (P5) of the gas tank 134 has not been reached at this time, 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 In the case of <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 hydrogen recovery in the liquid hydrogen bottle 180 is completed.

[0087] The control method of the vehicle-mounted liquid hydrogen system 100 provided in the fourth aspect of the present application may be performed by a controller 190 of the vehicle-mounted 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 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, and the compression assembly works, 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.

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

[0089] (1) The pipelines of the conventional on-board liquid hydrogen system 100 are simplified. 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 liquid hydrogen supply speed according to the pressure inside the liquid hydrogen bottle 180 and the working condition of the vehicle, thereby solving the problem that the self-pressurization system is too slow to increase the pressure 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 venting interface Vv. When the gas 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 also 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 second hydrogen supply pipeline 120 with simplified pipelines is combined with the power output component 114 of the first hydrogen supply pipeline 110, which reduces the leakage hot spots and the conversion of liquid hydrogen into gaseous hydrogen, while improving the stability of fuel supply when the fuel cell 200 system is working, 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 determines 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 direct release of hydrogen in the liquid hydrogen bottle.

[0095] In the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates 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 referred device or element 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 clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0098] In addition, the descriptions of "first", "second", etc. in this application are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and 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 spirit 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, It is 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, whose input end is connected to the gas phase outlet of the liquid hydrogen bottle, and whose output end is connected to the first hydrogen supply pipeline and close to the output end of the first electric control valve, and the second hydrogen supply pipeline is provided with a second electric control 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 electric-controlled valve. The third hydrogen supply pipeline is provided with a connected gas tank and a third electric-controlled valve. Two third electric-controlled valves are provided, and the two third electric-controlled valves are respectively located at the input end and the output end of the gas tank; A first pressure sensor, used to detect the gas pressure in the gas tank; A second pressure sensor is used to detect the gas phase pressure in the liquid hydrogen bottle; 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.

2. The vehicle-mounted liquid hydrogen system according to claim 1, It is 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, It is characterized in that The compression assembly includes a compressor and a driving member, the driving member is drivingly 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, It is characterized in that The first hydrogen supply pipeline is provided with a power output component, a vaporizer and a buffer tank. The first electric control 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, It is characterized in that It also includes a liquid filling pipeline and a discharge pipeline, 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.

6. The vehicle-mounted liquid hydrogen system according to any one of claims 1 to 3, It is characterized in that The controller is configured to: at the first gas pressure P of the gas tank 01 >P1, the controller controls the third electrically 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; in P 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; in P 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.

7. A vehicle, It is characterized in that A vehicle-mounted liquid hydrogen system comprising any one of claims 1-6.

8. A control method for a vehicle-mounted liquid hydrogen system according to any one of claims 1 to 6, It is 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 ≤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; when P 02 When P≤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.

9. The control method of the vehicle-mounted liquid hydrogen storage system according to claim 8, It is 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 ≤P2, control the first electronically controlled valve to conduct the first hydrogen supply pipeline, and the second electronically controlled valve 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 a set value, P3<P2; In P 02 When the pressure drops below P3, the first electrically 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.

10. A control method for the vehicle-mounted liquid hydrogen system according to claim 2 or 3, It is 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 electric control valve located 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 the case of P, the third electric control 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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