A liquid hydrogen pressurization and filling system driven by power and heat synergy

Abstract

The present invention discloses a liquid hydrogen pressurization and filling system driven by work and heat synergistically, with a cascade cryogenic and high-pressure container group as the core of the system, and adopts a combination of reciprocating liquid hydrogen pump pressurization and cryogenic and high-pressure container isochoric heat pressurization to achieve liquid hydrogen staged pressurization to 80-100MPa, and adopts the type of cascade cryogenic and high-pressure container for vehicle-mounted storage tank filling; the pressurization process and the filling process are deeply coupled, and the hydrogen flow in the filling process is used as a heat transfer medium to achieve efficient in-tank thermal pressurization of the cryogenic and high-pressure container without the need for additional driving force. The present invention is based on a combination of efficient low-pressure compression of a liquid hydrogen pump and heat-driven high-pressure compression without power consumption, making full use of the cold capacity of liquid hydrogen to replace the high pump power consumption required by the traditional pressurization process, combining with cascade storage tanks to reduce the loss of the filling process, and realizing low-energy continuous filling of liquid hydrogen filling stations.

Description

Technical Field

[0001] The present invention belongs to the technical field of hydrogen fuel filling, and in particular relates to a liquid hydrogen pressurization filling system driven by power and heat synergistically. Background Art

[0002] Liquid hydrogen refueling stations have the characteristics of small footprint and large capacity. Compared with high-pressure gas hydrogen refueling stations, they are more suitable for large-scale hydrogen refueling needs. According to different pressurization methods, liquid hydrogen refueling stations can be divided into gaseous pressurization and liquid pressurization, that is, pressurization through compressors and pressurization through high-pressure liquid hydrogen pumps. Since liquid pressurization has high efficiency and does not require precooling, liquid hydrogen refueling stations using high-pressure liquid hydrogen pumps can achieve lower unit mass refueling power consumption.

[0003] For example, the Chinese patent document with publication number CN115355440A discloses a low-temperature high-pressure hydrogen mixed filling type hydrogen filling station, including: liquid hydrogen storage tank, low-temperature saturated hydrogen transmission pipeline, liquid hydrogen booster pump, first low-temperature high-pressure hydrogen transmission pipeline, second low-temperature high-pressure hydrogen transmission pipeline, cold storage, ultra-high pressure gasifier, ultra-high pressure heater, low-temperature high-pressure hydrogen storage tank, low-temperature high-pressure hydrogen filling unit, first normal temperature high-pressure hydrogen storage tank, first hydrogen filling unit. The hydrogen filling station can realize multiple storage forms of liquid hydrogen, low-temperature high-pressure hydrogen and normal temperature high-pressure hydrogen, and realize mixed filling of up to 100MPa low-temperature high-pressure hydrogen, 35MPa high-pressure hydrogen and 70MPa high-pressure hydrogen.

[0004] A Chinese patent document with publication number CN113483259A discloses a hybrid filling system for a liquid hydrogen storage type hydrogen filling station, including a 35MPa hydrogen filling unit and a 70MPa hydrogen filling unit connected to a liquid hydrogen storage tank, and both filling units include a liquid hydrogen pump connected to the liquid hydrogen storage tank.

[0005] Although the high-pressure liquid hydrogen pump can achieve lower compression power consumption than hydrogen compression, under the high-pressure working condition of 90MPa, the leakage loss and friction loss of the liquid hydrogen pump increase dramatically, and the performance deteriorates seriously, resulting in the actual power consumption of the high-pressure liquid hydrogen pump being much higher than the theoretical value.

[0006] As a pressurization method that does not rely on mechanical work, thermal compression heats the liquid hydrogen in a sealed low-temperature high-pressure storage tank to increase the pressure in the tank. However, in the existing thermal compression process, it is impossible to utilize the residual hydrogen in the container after filling by simply relying on thermal compression. More than 30% of the hydrogen cannot be used and is discharged into the atmosphere. In addition, it is difficult to achieve continuous and rapid filling in the thermal compression process, so it is difficult to apply it in actual liquid hydrogen refueling stations.

[0007] In summary, the traditional mechanical liquid hydrogen pressurization method based on high-pressure liquid hydrogen pump has serious performance deterioration under high-pressure conditions, and it is difficult to further reduce energy consumption. Although the heat-driven pressurization method that does not rely on mechanical work can reduce energy consumption, there are problems such as large-scale liquid hydrogen unloading and slow pressurization speed. Therefore, it is urgent to explore new low-energy liquid hydrogen refueling methods. Summary of the invention

[0008] The present invention provides a liquid hydrogen pressurization and filling system driven by work and heat synergistically, which can actively pump and pressurize in the low-pressure area (less than 50MPa) by utilizing the high efficiency of the liquid hydrogen pump at low pressure, and passively pressurize in the high-pressure area (less than 100MPa) by isochoric heating based on a heat compression method that does not require power consumption, thereby realizing low-energy filling of liquid hydrogen filling stations.

[0009] A liquid hydrogen pressurization and filling system driven by power and heat synergistically comprises a station liquid hydrogen storage tank, a reciprocating liquid hydrogen pump and a cascade low-temperature and high-pressure vessel group, wherein the cascade low-temperature and high-pressure vessel group comprises at least four low-temperature and high-pressure vessels with the same structure;

[0010] The low-temperature and high-pressure container is provided with an input pipeline, an output pipeline and a return pipeline, and a booster heat exchanger is provided inside the low-temperature and high-pressure container;

[0011] Each input pipeline is connected to the input main pipe through an input regulating valve, each output pipeline is connected to the output main pipe through an output regulating valve, and each return pipeline is connected to the return main pipe through a return regulating valve; the inlet end of each boost heat exchanger is connected to the heat exchanger main input pipe through a heat exchanger regulating valve, and the outlet end is connected to the heat exchanger main output pipe;

[0012] One end of the input main pipe is connected to the outlet of the station liquid hydrogen storage tank through a reciprocating liquid hydrogen pump, and the other end is provided with an input main pipe safety valve;

[0013] One end of the reflux main pipe is connected to the inlet of the station liquid hydrogen storage tank through a main reflux regulating valve, and the other end is provided with a reflux main pipe safety valve;

[0014] The end of the output main pipe is connected to the No. 1 three-way valve, the No. 2 three-way valve and the first air heat exchanger in sequence, and the outlet of the first air heat exchanger is connected to the heat exchanger main input pipe after merging with the bypass of the No. 2 three-way valve;

[0015] The bypass of the No. 1 three-way valve and the end of the total output pipe of the heat exchanger merge into a filling pipeline, and the filling pipeline is connected to the No. 3 three-way valve and the second air heat exchanger in sequence. The outlet of the second air heat exchanger merges with the bypass of the No. 3 three-way valve and is then connected to the on-board storage tank.

[0016] The present invention uses a cascade cryogenic and high-pressure container group as the core of the system, and adopts a combination of reciprocating liquid hydrogen pump pressurization and cryogenic and high-pressure container isochoric thermal pressurization to achieve liquid hydrogen staged pressurization to 80-100MPa, and adopts a cascade cryogenic and high-pressure container type for vehicle-mounted storage tank filling; the pressurization process and the filling process are deeply coupled, and the hydrogen flow in the filling process is used as a heat transfer medium, so that efficient in-tank thermal pressurization of the cryogenic and high-pressure container is achieved without the need for additional driving force

[0017] In the present invention, two three-way valves are arranged before the first air heat exchanger, which are respectively used to bypass the air heat exchanger and the entire heat exchange and boosting circuit to adjust the heat exchange amount of the first air heat exchanger and the boosting heat exchanger. The third three-way valve arranged before the second air heat exchanger is used to bypass the second air heat exchanger to adjust the filling fluid temperature.

[0018] Furthermore, the site liquid hydrogen storage tank is provided with a site liquid hydrogen storage tank safety valve, and the vehicle-mounted storage tank is provided with a discharge regulating valve.

[0019] Furthermore, a pressure sensor is provided on the liquid hydrogen storage tank at the site, each low-temperature and high-pressure container and the vehicle-mounted storage tank are connected to temperature and pressure sensors, and each booster heat exchanger is respectively connected to a temperature sensor before and after. The data measured by the sensor is transmitted to the control center in real time to control the operation of the reciprocating liquid hydrogen pump and each regulating valve.

[0020] Optionally, the cascade cryogenic and high-pressure vessel group comprises four cryogenic and high-pressure vessels, of which three cryogenic and high-pressure vessels are in a filling process for cascade filling of vehicle-mounted storage tanks, corresponding to high-pressure filling containers (higher than the upper pressure limit required for filling vehicle-mounted storage tanks), medium-pressure filling containers and low-pressure filling containers (higher than the lower pressure limit required for filling vehicle-mounted storage tanks), respectively; another cryogenic and high-pressure vessel is in a pressurization process driven by work and heat synergy, and the liquid hydrogen in the station liquid hydrogen storage tank is pressurized and filled into the cryogenic and high-pressure vessel by a reciprocating liquid hydrogen pump until the pressure rises to 30-50 MPa, and then is isochoric heating and pressure-raising to 80-100 MPa by a boosting heat exchanger; wherein, in the process of isochoric heating and pressure-raising to 80-100 MPa, the hydrogen flow from the cryogenic and high-pressure vessel in the filling process to fill the vehicle-mounted storage tank is used to realize isochoric heating and pressurization of the cryogenic and high-pressure vessel in the pressurization process.

[0021] The specific process of isochoric heating and pressure increase to 80-100 MPa is as follows:

[0022] At the beginning, the low-temperature high-pressure container with the lowest pressure in the filling process is filled. The supercritical hydrogen enters the first air heat exchanger through the output regulating valve to be heated to near room temperature, and then enters the boosting heat exchanger of the low-temperature high-pressure container in the pressurization process through the heat exchanger regulating valve to perform isochoric pressurization on the low-temperature high-pressure container in the pressurization process until its pressure reaches 80-100MPa.

[0023] After the supercritical hydrogen flow comes out of the booster heat exchanger, it is heated to the required filling temperature through the No. 3 three-way valve and the second air heat exchanger, and then filled into the on-board storage tank; the output temperature of the first air heat exchanger is adjusted by the No. 2 three-way valve; when the low-temperature and high-pressure container in the boosting process reaches 80-100MPa, the filling hydrogen flow is directly led to the booster heat exchanger through the No. 1 three-way valve.

[0024] When the pressure of the low-temperature and high-pressure container filled with high pressure is lower than the upper pressure limit required for filling the on-board storage tank (taking 75MPa as an example), or the pressure of the low-temperature and high-pressure container filled with low pressure is lower than the lower pressure limit required for filling the on-board storage tank (taking 10MPa as an example), the functions of the four low-temperature and high-pressure containers change at the same time. The low-temperature and high-pressure container originally in the pressurization process becomes a high-pressure filling container, the original high-pressure filling container becomes a medium-pressure filling container, the original medium-pressure filling container becomes a low-pressure filling container, and the original low-pressure filling container enters the pressurization process; through the coupling and matching of the pressurization process and the cascade filling process, the pressurization process and the filling process in each low-temperature and high-pressure container are synchronized, and continuous and rapid pressurization and filling are achieved.

[0025] Optionally, the boost heat exchanger is in the form of a tube wound outside the inner tank of the low-temperature and high-pressure container, or the boost heat exchanger is buried inside the inner tank of the low-temperature and high-pressure container in the form of a fin tube heat exchanger or a bellows heat exchanger.

[0026] Preferably, the reciprocating liquid hydrogen pump is a 30-50 MPa liquid hydrogen pump, driven by an electric motor or hydraulically.

[0027] Compared with the prior art, the present invention has the following beneficial effects:

[0028] 1. The present invention adopts a liquid hydrogen pump for pressurization below 50MPa and a heat exchanger for pressurization above 50MPa. At the same time, a 50MPa liquid hydrogen pump which is more common on the market, mature in technology and more efficient is used to replace a 90MPa high-pressure liquid hydrogen pump which has high technical complexity and high energy consumption and only a few foreign manufacturers have mature products. This realizes low-energy refueling of liquid hydrogen refueling stations while reducing equipment investment costs.

[0029] 2. The present invention is based on the combination of high-efficiency low-pressure compression of liquid hydrogen pump and high-pressure compression driven by heat without power consumption, which can increase pressure step by step, complement each other's advantages and make full use of the cooling capacity of liquid hydrogen. Replace the high pump power consumption required by the traditional boosting process and combine with cascade tanks to reduce the filling process Loss, greatly reducing the energy consumption of liquid hydrogen refueling stations. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 The figure is a schematic diagram of the overall structure of a liquid hydrogen pressurization and filling system driven by power and heat synergistically according to the present invention. DETAILED DESCRIPTION

[0031] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be pointed out that the embodiments described below are intended to facilitate the understanding of the present invention and do not have any limiting effect on the present invention.

[0032] like Figure 1 As shown, a liquid hydrogen pressurizing and filling system driven by power and heat synergistically includes a site liquid hydrogen storage tank 1, a site liquid hydrogen storage tank safety valve 2, a motor 3, a reciprocating liquid hydrogen pump 4, an input regulating valve 5, a low-temperature and high-pressure container 6, an output regulating valve 7, a reflux regulating valve 8, an input main pipe safety valve 9, a reflux main pipe safety valve 10, a No. 1 three-way valve 11, a No. 2 three-way valve 12, a first air heat exchanger 13, a heat exchanger regulating valve 14, a booster heat exchanger 15, a No. 3 three-way valve 16, a second air heat exchanger 17, an on-board storage tank 18, a discharge regulating valve 19 and a total reflux regulating valve 20.

[0033] An input pipeline, an output pipeline and a return pipeline are provided on the low-temperature and high-pressure container 6, and a booster heat exchanger 15 is provided inside the low-temperature and high-pressure container 6; each input pipeline is connected to the input main pipe through an input regulating valve 5, each output pipeline is connected to the output main pipe through an output regulating valve 7, and each return pipeline is connected to the return main pipe through a return regulating valve 8; the inlet end of each booster heat exchanger 15 is connected to the heat exchanger main input pipe through a heat exchanger regulating valve 14, and the outlet end is connected to the heat exchanger main output pipe.

[0034] One end of the input main pipe is connected to the outlet of the site liquid hydrogen storage tank 1 through a reciprocating liquid hydrogen pump 4, and the other end is provided with an input main pipe safety valve 9; one end of the reflux main pipe is connected to the inlet of the site liquid hydrogen storage tank 1 through a total reflux regulating valve 20, and the other end is provided with a reflux main pipe safety valve 10; the end of the output main pipe is sequentially connected to the No. 1 three-way valve 11, the No. 2 three-way valve 12 and the first air heat exchanger 13, and the outlet of the first air heat exchanger 13 is connected to the heat exchanger main input pipe after merging with the bypass of the No. 2 three-way valve 12.

[0035] The bypass of the No. 1 three-way valve 11 and the end of the total output pipe of the heat exchanger merge into a filling pipeline, and the filling pipeline is connected to the No. 3 three-way valve 16 and the second air heat exchanger 17 in sequence. The outlet of the second air heat exchanger 17 merges with the bypass of the No. 3 three-way valve 16 and is then connected to the on-board storage tank 18.

[0036] In the embodiment of the present invention, four cryogenic and high-pressure containers 6 are used as an example for description. Four cryogenic and high-pressure containers 6 are the minimum requirement for realizing the process of the present invention. Among them, three cryogenic and high-pressure containers 6 are in the filling process, which are respectively at high, medium and low pressures, and the on-board storage tank 18 is filled in stages. Another cryogenic and high-pressure container 6 is in the pressurization process driven by power and heat synergy. The liquid hydrogen in the station liquid hydrogen storage tank 1 is pressurized and filled into the cryogenic and high-pressure container 6 in the pressurization process through the reciprocating liquid hydrogen pump 4 driven by the motor 3 until the pressure reaches 50MPa.

[0037] In the present invention, the hydrogen flow filled into the vehicle storage tank 18 by the low-temperature and high-pressure container 6 in the filling process is used to realize the isochoric heating and pressurization of the low-temperature and high-pressure container 6 in the supercharging process. At the beginning, the low-temperature and high-pressure container 6 with the lowest pressure in the filling process is filled, and the supercritical hydrogen enters the first air heat exchanger 13 through the output regulating valve 7 to be heated to near room temperature, and then enters the boosting heat exchanger 15 of the low-temperature and high-pressure container 6 in the supercharging process through the heat exchanger regulating valve 14 to isochoric pressurize the low-temperature and high-pressure container 6 in the supercharging process until its pressure reaches 90MPa. After the supercritical hydrogen flow comes out of the boosting heat exchanger 15, it is heated to the required temperature for filling through the No. 3 three-way valve 16 and the second air heat exchanger 17, and then filled into the vehicle storage tank 18. The output temperature of the first air heat exchanger 13 can be adjusted by the No. 2 three-way valve 12; when the low-temperature and high-pressure container 6 in the pressurization process reaches 90MPa, the filling hydrogen flow is directly led to the boosting heat exchanger 15 in the tank through the No. 1 three-way valve 11.

[0038] When the pressure of the cryogenic and high-pressure container 6 for high-pressure filling is lower than 75MPa, or the pressure of the cryogenic and high-pressure container 6 for low-pressure filling is lower than 10MPa, the functions of the four cryogenic and high-pressure containers change at the same time. The cryogenic and high-pressure container 6 originally used for high-pressure filling is changed to medium-pressure filling; the cryogenic and high-pressure container 6 originally used for medium-pressure filling is changed to low-pressure filling; the cryogenic and high-pressure container 6 originally used for low-pressure filling is changed to the pressurization process; the cryogenic and high-pressure container 6 originally in the pressurization process is changed to high-pressure filling. By coupling and matching the power-heat synergistic pressurization process and the cascade filling process, the pressurization process and the filling process in each cryogenic and high-pressure container 6 can be synchronized to achieve continuous and rapid pressurization and filling.

[0039] When there is no vehicle refueling at the hydrogen refueling station for a long time, the low-temperature and high-pressure container 6 will increase in temperature and pressure due to heat leakage, which may cause the pressure to exceed the design pressure of the storage tank in extreme cases. The over-pressured low-temperature and high-pressure container 6 can be depressurized to other low-temperature and high-pressure containers 6 through the reflux regulating valve 8 and the reflux main pipe, or to the station liquid hydrogen storage tank 1 through the main reflux regulating valve 20.

[0040] In extreme cases, when the pressure of the site liquid hydrogen storage tank 1 is too high, the pressure can be released to the atmosphere through the site liquid hydrogen storage tank safety valve 2; during the filling process of the reciprocating liquid hydrogen pump 4, if the pressure of the low-temperature and high-pressure container 6 being filled is too high, the pressure can be released to the atmosphere through the input main pipe safety valve 9; when the pressure of any low-temperature and high-pressure container 6 is too high, the pressure can be released to the atmosphere through the reflux regulating valve 8 and the reflux main pipe safety valve 10.

[0041] In actual application, the cryogenic and high-pressure container 6 can be selected as a type I, type II, type III or type IV cryogenic and high-pressure container, and the number of cryogenic and high-pressure containers 6 can also be further increased according to demand. The booster heat exchanger 15 can be in the form of a pipe wrapped around the inner tank of the cryogenic and high-pressure container, or the heat exchanger can be buried inside the inner tank, using a finned tube heat exchanger, a bellows heat exchanger, and the like. The cryogenic and high-pressure container 6 can have multiple heat exchange and boosting circuits according to the heat exchange requirements to meet the rapid heating requirements; an electric heater can be used as a backup or auxiliary heat source. The on-board storage tank 18 can be a 35MPa or 70MPa standard high-pressure hydrogen tank. The cryogenic working fluid can also be other cryogenic liquids such as liquid nitrogen and liquefied natural gas. The motor 3 can also be replaced with a hydraulic drive device.

[0042] The embodiments described above provide a detailed description of the technical solutions and beneficial effects of the present invention. It should be understood that the above are only specific embodiments of the present invention and are not intended to limit the present invention. Any modifications, supplements and equivalent substitutions made within the scope of the principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A liquid hydrogen pressurization and filling system driven by power and heat synergy, characterized in that: It comprises a site liquid hydrogen storage tank (1), a reciprocating liquid hydrogen pump (4) and a cascade low-temperature and high-pressure vessel group, wherein the cascade low-temperature and high-pressure vessel group comprises at least four low-temperature and high-pressure vessels (6) of the same structure; The low-temperature and high-pressure container (6) is provided with an input pipeline, an output pipeline and a return pipeline, and a boost heat exchanger (15) is provided inside the low-temperature and high-pressure container (6); Each input pipeline is connected to the input main pipe through an input regulating valve (5), each output pipeline is connected to the output main pipe through an output regulating valve (7), and each return pipeline is connected to the return main pipe through a return regulating valve (8); the inlet end of each boost heat exchanger (15) is connected to the heat exchanger main input pipe through a heat exchanger regulating valve (14), and the outlet end is connected to the heat exchanger main output pipe; One end of the input main pipe is connected to the outlet of the station liquid hydrogen storage tank (1) through a reciprocating liquid hydrogen pump (4), and the other end is provided with an input main pipe safety valve (9); One end of the reflux main pipe is connected to the inlet of the station liquid hydrogen storage tank (1) through a main reflux regulating valve (20), and the other end is provided with a reflux main pipe safety valve (10); The end of the output main pipe is connected to the No. 1 three-way valve (11), the No. 2 three-way valve (12) and the first air heat exchanger (13) in sequence, and the outlet of the first air heat exchanger (13) is connected to the main input pipe of the heat exchanger after merging with the bypass of the No. 2 three-way valve (12); The bypass of the No. 1 three-way valve (11) and the end of the total output pipe of the heat exchanger are connected to the filling pipeline, and the filling pipeline is connected to the No. 3 three-way valve (16) and the second air heat exchanger (17) in sequence. The outlet of the second air heat exchanger (17) is connected to the vehicle-mounted storage tank (18) after merging with the bypass of the No. 3 three-way valve (16).

2. The liquid hydrogen pressurization and filling system driven by power and heat synergistically according to claim 1 is characterized in that: The site liquid hydrogen storage tank (1) is provided with a site liquid hydrogen storage tank safety valve (2), and the vehicle-mounted storage tank (18) is provided with a discharge regulating valve (19).

3. The liquid hydrogen pressurization and filling system driven by power and heat synergistically according to claim 1 is characterized in that: A pressure sensor is provided on the station liquid hydrogen storage tank (1), each low-temperature high-pressure container (6) and the vehicle-mounted storage tank (18) is connected to a temperature and pressure sensor, and each boost heat exchanger (15) is respectively connected to a temperature sensor at the front and rear.

4. The liquid hydrogen pressurization and filling system driven by power and heat synergistically according to claim 1 is characterized in that: The cascade low-temperature and high-pressure container group comprises four low-temperature and high-pressure containers (6), wherein three low-temperature and high-pressure containers are in a filling process for cascade filling of a vehicle-mounted storage tank (18), corresponding to a high-pressure filling container, a medium-pressure filling container and a low-pressure filling container respectively; another low-temperature and high-pressure container is in a pressurization process driven by power and heat synergy, and the liquid hydrogen in the station liquid hydrogen storage tank (1) is pressurized and filled into the low-temperature and high-pressure container by a reciprocating liquid hydrogen pump (4) until the pressure rises to 30 to 50 MPa, and then isovolumetric heating is performed by a booster heat exchanger (15) to increase the pressure to 80 to 100 MPa; In the process of isochoric heating and pressurizing to 80-100 MPa, the hydrogen flow used to fill the vehicle storage tank (18) with the low-temperature and high-pressure container (6) in the filling process is used to achieve isochoric heating and pressurizing of the low-temperature and high-pressure container (6) in the pressurization process.

5. The liquid hydrogen pressurization and filling system driven by power and heat synergistically according to claim 4 is characterized in that: The specific process of isochoric heating and pressure increase to 80-100 MPa is as follows: Initially, the low-temperature high-pressure container (6) with the lowest pressure in the filling process is filled, and the supercritical hydrogen enters the first air heat exchanger (13) through the output regulating valve (7) to be heated to near room temperature, and then enters the boosting heat exchanger (15) of the low-temperature high-pressure container (6) in the pressurization process through the heat exchanger regulating valve (14) to perform isochoric pressurization on the low-temperature high-pressure container (6) in the pressurization process until its pressure reaches 80-100 MPa; After the supercritical hydrogen flow comes out of the boost heat exchanger (15), it is heated to the required temperature for filling through the No. 3 three-way valve (16) and the second air heat exchanger (17), and then filled into the vehicle-mounted storage tank (18); the output temperature of the first air heat exchanger (13) is adjusted by the No. 2 three-way valve (12); when the low-temperature and high-pressure container (6) in the boost process reaches 80-100MPa, the filling hydrogen flow is directly led to the boost heat exchanger (15) through the No. 1 three-way valve (11).

6. The liquid hydrogen pressurization and filling system driven by power and heat synergistically according to claim 5 is characterized in that: When the pressure of the cryogenic and high-pressure container filled with high pressure is lower than the upper pressure limit required for filling the on-board storage tank, or the pressure of the cryogenic and high-pressure container filled with low pressure is lower than the lower pressure limit required for filling the on-board storage tank, the functions of the four cryogenic and high-pressure containers change simultaneously. The cryogenic and high-pressure container originally in the pressurization process becomes a high-pressure filling container, the original high-pressure filling container becomes a medium-pressure filling container, the original medium-pressure filling container becomes a low-pressure filling container, and the original low-pressure filling container enters the pressurization process; by coupling and matching the pressurization process and the cascade filling process, the pressurization process and the filling process in each cryogenic and high-pressure container (6) are synchronized, and continuous and rapid pressurization filling is achieved.

7. The liquid hydrogen pressurization and filling system driven by power and heat synergistically according to claim 1 is characterized in that: The boost heat exchanger (15) is in the form of a tube wound outside the inner tank of the low-temperature and high-pressure container, or the boost heat exchanger (15) is buried inside the inner tank of the low-temperature and high-pressure container and is in the form of a fin tube heat exchanger or a bellows heat exchanger.

8. The liquid hydrogen pressurization and filling system driven by power and heat synergistically according to claim 1 is characterized in that: The reciprocating liquid hydrogen pump (4) is a 30-50 MPa liquid hydrogen pump driven by an electric motor or hydraulic pressure.

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