Fuel cell hydrogen system testing device

Abstract

The invention relates to the technical field of vehicles, and particularly discloses a fuel cell hydrogen system testing device which comprises a testing platform, a main gas supply unit, a galvanic pile simulation unit, an auxiliary gas supply unit, a circulating gas supply unit and a tail exhaust unit, and the main gas supply unit and / or the circulating gas supply unit provide gas for a to-be-tested piece so as to test the to-be-tested piece. Meanwhile, gas is introduced into the sealing tank through the to-be-tested piece, the temperature and the liquid level height of the water solution are controlled through the simulation piece in the sealing tank, then the temperature and the humidity of the gas in the sealing tank and the volume in the galvanic pile can be adjusted, the galvanic pile reaction environment can be simulated, and after the gas is exhausted from the galvanic pile, one part of the gas is exhausted into the air through the tail exhaust unit; and the other part of the gas enters the to-be-tested piece again through the second adapter. According to the device, the environment of the electric pile is simulated through the electric pile simulation unit, so that the working environment of the hydrogen system is highly restored, and the accuracy of testing the to-be-tested piece in the hydrogen system is improved.

Description

Technical Field

[0001] The invention relates to the technical field of vehicles, and in particular to a fuel cell hydrogen system testing device. Background Art

[0002] As an efficient and clean energy carrier, hydrogen energy is gradually becoming an important part of the energy strategy of various countries, and is playing an increasingly important role in global environmental protection and economic development. A hydrogen fuel cell is a device that directly converts the chemical energy of hydrogen and oxygen into electrical energy through an electrochemical reaction. With its advantages of high efficiency, environmental protection, and low noise, it is considered to be an important development direction of hydrogen energy technology in the future and is widely used in transportation, energy storage, and various industrial fields. As a key component of a hydrogen fuel cell, the hydrogen system can ensure the efficient supply of anode fuel and achieve reliable and economical operation of the system.

[0003] There are many technical routes for the hydrogen supply circulation system of fuel cells, and the testing requirements for components are high, requiring performance verification or calibration under different schemes. In order to support the research and development requirements of hydrogen fuel cell hydrogen systems and components, the industry has proposed a series of testing devices and methods. However, existing testing devices often ignore the effects of the internal reaction state of the stack, the stack volume, and the piezoresistance when testing the hydrogen system.

[0004] Therefore, a fuel cell hydrogen system testing device is urgently needed to solve the above problems. Summary of the invention

[0005] The purpose of the present invention is to provide a fuel cell hydrogen system testing device to solve the problem that the existing testing devices in the related art often ignore the influence of the internal reaction state of the fuel cell stack, the fuel cell stack volume and the piezoresistance during the hydrogen system testing.

[0006] The present invention provides a fuel cell hydrogen system testing device, the fuel cell hydrogen system testing device comprising:

[0007] A test platform, used for setting a test piece, including a first adapter, a second adapter and a third adapter;

[0008] A main gas supply unit, connected to one end of the first adapter and used to provide a first gas to the test piece;

[0009] A stack simulation unit, comprising a sealed tank and a simulation component, wherein a water solution is provided in the sealed tank, and the simulation component is used to adjust the temperature and liquid level of the water solution in the sealed tank, wherein the sealed tank comprises a first interface and a second interface located below the liquid level of the water solution, and a third interface located above the liquid level of the water solution, and one end of the third adapter is connected to the first interface;

[0010] an auxiliary gas supply unit, connected to the second interface and used to provide a second gas into the sealed tank;

[0011] A circulating air supply unit, comprising a circulating pipe, for connecting the third interface with one end of the second adapter, wherein the circulating air supply unit is capable of adjusting the air flow rate of the circulating pipe;

[0012] The tail exhaust unit comprises a tail exhaust pipe, one end of which is connected to the circulation pipe and the other end is connected to the atmosphere. The tail exhaust unit can adjust the on and off of the tail exhaust pipe.

[0013] As a preferred technical solution for a fuel cell hydrogen system testing device, the main gas supply unit includes a main gas supply pipe and a first pressure reducing valve, a first one-way valve, a gas storage tank and a first flow meter which are sequentially arranged on the main gas supply pipe, and one end of the main gas supply pipe close to the first flow meter is connected to one end of the first adapter.

[0014] As a preferred technical solution for the fuel cell hydrogen system testing device, the main gas supply unit also includes a first liquid regulating valve, a first heat exchanger and a first sensor. The first liquid regulating valve and the first heat exchanger are connected in series with the main gas supply pipe in sequence and are located between the first flow meter and the first adapter. The first sensor is used to monitor the gas temperature and pressure at one end of the first adapter. The first sensor is communicatively connected to the first liquid regulating valve and the first heat exchanger, respectively.

[0015] As a preferred technical solution for the fuel cell hydrogen system testing device, the auxiliary gas supply unit includes an auxiliary gas supply pipe and a second pressure reducing valve, a second check valve and a second flow meter arranged on the auxiliary gas supply pipe in sequence, and one end of the auxiliary gas supply pipe close to the second flow meter is connected to the second interface.

[0016] As an optimal technical solution for the fuel cell hydrogen system testing device, the circulating gas supply unit also includes a second sensor and a proportional valve group connected in series on the circulating pipe, the second sensor is used to monitor the temperature and pressure at the third interface, and the second sensor is communicatively connected to the proportional valve group.

[0017] As a preferred technical solution for the fuel cell hydrogen system testing device, the circulating air supply unit also includes a first stop valve, a third flow meter and a third one-way valve connected in series on the circulating pipe in sequence, and the first stop valve, the third flow meter and the third one-way valve are all located between the proportional valve group and the second adapter.

[0018] As a preferred technical solution for the fuel cell hydrogen system testing device, the circulating air supply unit also includes a second liquid regulating valve, a second heat exchanger and a third sensor which are sequentially connected in series on the circulating pipe, the second liquid regulating valve, the second heat exchanger and the third sensor are all located between the third one-way valve and the second adapter, the third sensor is used to monitor the temperature and pressure of one end of the second adapter, and the third sensor is respectively communicated with the second liquid regulating valve and the second heat exchanger.

[0019] As a preferred technical solution for the fuel cell hydrogen system testing device, the circulating air supply unit also includes a humidity sensor, which is used to monitor the humidity at one end of the second adapter, and the humidity sensor is communicatively connected with the simulation component.

[0020] As an optimal technical solution for the fuel cell hydrogen system testing device, the tail exhaust unit also includes a gas-liquid separator, a second stop valve and a fourth flowmeter, the gas-liquid separator includes an air inlet, an air outlet and a gas-liquid outlet, the air inlet is connected to the proportional valve group, the air outlet is connected to the first stop valve, the gas-liquid outlet is connected to one end of the tail exhaust pipe, and the second stop valve and the fourth flowmeter are connected in series to the tail exhaust pipe.

[0021] As a preferred technical solution of the fuel cell hydrogen system test device, the test platform also includes a fourth adapter and a fifth adapter;

[0022] It also includes a cooling unit, including a liquid pump and a third heat exchange element, the liquid inlet of the liquid pump is connected to one end of the fourth adapter, the liquid outlet of the liquid pump is connected to the liquid inlet of the third heat exchange element, and the liquid outlet of the third heat exchange element is connected to one end of the fifth adapter.

[0023] The beneficial effects of the present invention are:

[0024] The present invention provides a fuel cell hydrogen system test device, which includes a test platform, a main gas supply unit, a stack simulation unit, an auxiliary gas supply unit, a circulating gas supply unit and a tail exhaust unit. The test platform is used to set a test piece, including a first adapter, a second adapter and a third adapter; the main gas supply unit is connected with one end of the first adapter and is used to provide a first gas to the test piece; the stack simulation unit includes a sealed tank and a simulation part, an aqueous solution is provided in the sealed tank, the simulation part is used to adjust the temperature and liquid level of the aqueous solution in the sealed tank, the sealed tank includes a first interface and a second interface located below the liquid level of the aqueous solution, and a third interface located above the liquid level of the aqueous solution, one end of the third adapter is connected with the first interface; the auxiliary gas supply unit is connected with the second interface and is used to provide a second gas to the sealed tank; the circulating gas supply unit includes a circulating pipe, the circulating gas supply unit is used to connect the third interface and one end of the second adapter, and the circulating gas supply unit can adjust the airflow rate of the circulating pipe; the tail exhaust unit includes a tail exhaust pipe, one end of the tail exhaust pipe is connected with the circulating pipe, and the other end is connected with the atmosphere, and the tail exhaust unit can adjust the on and off of the tail exhaust pipe. When testing the test piece of the hydrogen system, firstly, the air inlet of the test piece is connected through the first adapter and / or the second adapter, and the air outlet of the test piece is connected through the third adapter. The main gas supply unit and / or the circulating gas supply unit provide gas to the test piece to test the test piece. At the same time, the test piece passes the gas into the sealed tank, and the temperature and liquid level of the aqueous solution are controlled by the simulation part in the sealed tank, so as to adjust the temperature, humidity of the gas in the sealed tank and the volume in the stack to simulate the environment of the stack reaction. After the gas is discharged from the stack, a part of it is discharged into the air through the tail exhaust unit, which simulates the consumption of the gas ejected by the test piece by the stack, and the other part is used as the gas source of the circulating gas supply unit to enter the test piece again through the second adapter. The device simulates the environment of the stack through the stack simulation unit, thereby highly restoring the working environment of the hydrogen system in the fuel cell, and improving the accuracy of the test of the test piece in the hydrogen system. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 Schematic diagram of the structure of a fuel cell hydrogen system testing device in an embodiment of the present invention.

[0026] In the figure:

[0027] 1. Test platform; 11. First adapter; 12. Second adapter; 13. Third adapter; 14. Fourth adapter; 15. Fifth adapter;

[0028] 2. Main air supply unit; 21. Main air supply pipe; 22. First pressure reducing valve; 23. First one-way valve; 24. Air storage tank; 25. First flow meter; 26. First liquid regulating valve; 27. First heat exchange element; 28. First sensor;

[0029] 3. Battery stack simulation unit; 31. Sealed tank; 32. Simulation component; 33. First interface; 34. Second interface; 35. Third interface;

[0030] 4. Auxiliary air supply unit; 41. Auxiliary air supply pipe; 42. Second pressure reducing valve; 43. Second one-way valve; 44. Second flow meter;

[0031] 51. circulation pipe; 52. second sensor; 53. proportional valve group; 54. first stop valve; 55. third flow meter; 56. third check valve; 57. second liquid regulating valve; 58. second heat exchange element; 59. third sensor; 60. humidity sensor;

[0032] 6. tail exhaust unit; 61. tail exhaust pipe; 62. gas-liquid separator; 63. second stop valve; 64. fourth flow meter;

[0033] 71. Liquid pump; 72. Third heat exchange element. DETAILED DESCRIPTION

[0034] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0035] In the description of the present invention, it should be noted that the orientations or positional relationships indicated by the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. Among them, the terms "first position" and "second position" are two different positions, and the first feature "above", "above" and "above" the second feature include the first feature being directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. The first feature "below", "below" and "below" the second feature include the first feature being directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0036] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it 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 it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0037] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0038] like Figure 1As shown, the present embodiment provides a fuel cell hydrogen system test device, which includes a test platform 1, a main gas supply unit 2, a stack simulation unit 3, an auxiliary gas supply unit 4, a circulating gas supply unit and a tail exhaust unit 6. The test platform 1 is used to set the test piece, including a first adapter 11, a second adapter 12 and a third adapter 13; the main gas supply unit 2 is connected to one end of the first adapter 11 and is used to provide a first gas to the test piece; the stack simulation unit 3 includes a sealed tank 31 and a simulation part 32, an aqueous solution is provided in the sealed tank 31, and the simulation part 32 is used to adjust the temperature and liquid level of the aqueous solution in the sealed tank 31, and the sealed tank 31 includes The first interface 33 and the second interface 34 are located below the liquid level of the aqueous solution, and the third interface 35 is located above the liquid level of the aqueous solution. One end of the third adapter 13 is connected to the first interface 33; the auxiliary gas supply unit 4 is connected to the second interface 34 and is used to provide the second gas to the sealed tank 31; the circulating gas supply unit includes a circulating pipe 51, and the circulating gas supply unit is used to connect the third interface 35 and one end of the second adapter 12. The circulating gas supply unit can adjust the gas flow rate of the circulating pipe 51; the tail exhaust unit 6 includes a tail exhaust pipe 61, one end of the tail exhaust pipe 61 is connected to the circulating pipe 51, and the other end is connected to the atmosphere. The tail exhaust unit 6 can adjust the on and off of the tail exhaust pipe 61. When testing the test piece of the hydrogen system, firstly, the air inlet of the test piece is connected through the first adapter 11 and / or the second adapter 12, and the third adapter 13 is connected to the air outlet of the test piece. The main gas supply unit 2 and / or the circulating gas supply unit provide gas to the test piece to test the test piece. At the same time, the test piece passes gas into the sealed tank 31, and the temperature and liquid level of the aqueous solution are controlled by the simulation piece 32 in the sealed tank 31, so that the temperature, humidity and volume of the gas in the sealed tank 31 can be adjusted to simulate the environment of the stack reaction. After the gas is discharged from the stack, a part of it is discharged into the air through the tail discharge unit 6, which simulates the consumption of the gas ejected by the test piece by the stack, and the other part is used as the gas source of the circulating gas supply unit and enters the test piece again through the second adapter 12. The device simulates the environment of the stack through the stack simulation unit 3, thereby highly reducing the working environment of the hydrogen system in the fuel cell and improving the accuracy of the test of the test piece in the hydrogen system.

[0039] Specifically, the part to be tested is an ejector, a sprayer, a circulating pump, etc. When the part to be tested is an ejector, the air inlet of the ejector is connected to the other end of the first adapter 11, the air suction port of the ejector is connected to the other end of the second adapter 12, and the ejection port of the ejector is connected to the other end of the third adapter 13; when the part to be tested is an ejector, the air inlet of the ejector is connected to the other end of the first adapter 11, and the ejection port of the ejector is connected to the other end of the third adapter 13; when the part to be tested is a circulating pump, the air inlet of the circulating pump is connected to the other end of the first adapter 11 and the other end of the second adapter 12 at the same time, and the air outlet of the circulating pump is connected to the other end of the third adapter 13.

[0040] Specifically, the first gas is hydrogen, the second gas is nitrogen, and the aqueous solution is a deionized aqueous solution.

[0041] Optionally, the main gas supply unit 2 simulates the processing and regulation of the decompressed hydrogen to ensure the pressure, temperature and other parameter requirements when entering the fuel cell stack; after the anode and cathode gases react through the stack, a part of the cathode air seeps into the anode side, and the unreacted hydrogen enters the fuel cell hydrogen system again with the circulating gas supply unit to improve the hydrogen utilization rate, so the auxiliary gas supply unit 4 simulates part of the cathode air that seeps into the anode side, specifically, this part of the air is replaced by nitrogen.

[0042] Optionally, the main gas supply unit 2 includes a main gas supply pipe 21 and a first pressure reducing valve 22, a first one-way valve 23, a gas tank 24 and a first flow meter 25 which are sequentially arranged on the main gas supply pipe 21. One end of the main gas supply pipe 21 close to the first flow meter 25 is connected to one end of the first adapter 11. In this embodiment, one end of the main gas supply pipe 21 is connected to an external gas source, and the other end is connected to one end of the first adapter 11. The first pressure reducing valve 22 can reduce the first gas provided by the external gas source to a safe gas pressure range, the first one-way valve 23 can prevent the first gas from flowing to the external gas source, and the first flow meter 25 is used to monitor the flow of the first gas entering the first adapter 11. The gas tank 24 stores the first gas, and the gas tank 24 is used to stabilize the gas pressure in the main gas supply pipe 21.

[0043] Optionally, the main gas supply unit 2 further includes a first liquid regulating valve 26, a first heat exchanger 27 and a first sensor 28. The first liquid regulating valve 26 and the first heat exchanger 27 are sequentially connected in series to the main gas supply pipe 21 and are located between the first flowmeter 25 and the first adapter 11. The first sensor 28 is used to monitor the temperature and pressure of the gas at one end of the first adapter 11. The first sensor 28 is respectively connected to the first liquid regulating valve 26 and the first heat exchanger 27 for communication. In this embodiment, the first liquid regulating valve 26 is used to adjust the pressure of the first gas entering the first adapter 11, the first heat exchanger 27 is used to adjust the temperature of the first gas entering the first adapter 11, and the first sensor 28 is a temperature and pressure sensor, which can monitor the temperature and pressure of the first gas entering the first adapter 11, and then transmit the monitored data to the first liquid regulating valve 26 and the first heat exchanger 27, so that the first liquid regulating valve 26 and the first heat exchanger 27 adjust their respective working states, thereby keeping the first gas entering the first adapter 11 at the set temperature and pressure.

[0044] Optionally, the auxiliary gas supply unit 4 includes an auxiliary gas supply pipe 41 and a second pressure reducing valve 42, a second one-way valve 43 and a second flow meter 44 which are sequentially arranged on the auxiliary gas supply pipe 41, and one end of the auxiliary gas supply pipe 41 close to the second flow meter 44 is connected to the second interface 34. In this embodiment, the other end of the auxiliary gas supply pipe 41 is connected to an external gas source, the second pressure reducing valve 42 can reduce the second gas provided by the external gas source to a safe gas pressure range, the second one-way valve 43 can prevent the second gas from flowing to the external gas source, and the second flow meter 44 is used to monitor the flow of the second gas entering the sealed tank 31.

[0045] Optionally, the circulating gas supply unit further includes a second sensor 52 and a proportional valve group 53 which are sequentially connected in series on the circulating pipe 51, the second sensor 52 is used to monitor the temperature and pressure at the third interface 35, and the second sensor 52 is in communication connection with the proportional valve group 53. In this embodiment, the second sensor 52 is a temperature and pressure sensor, the pressure at the third interface 35 of the sealed tank 31 (stack inlet pressure) is fed back by the third sensor 59, and the stack piezoresistance is accurately simulated in a closed loop by adjusting the rear-end proportional valve group 53.

[0046] Optionally, the circulating gas supply unit further includes a first stop valve 54, a third flow meter 55 and a third one-way valve 56 which are sequentially connected in series on the circulating pipe 51, and the first stop valve 54, the third flow meter 55 and the third one-way valve 56 are all located between the proportional valve group 53 and the second adapter 12. In this embodiment, the first stop valve 54 is used to cut off the circulating pipe 51. When the ejector is tested, the circulating pipe 51 needs to be cut off by the first stop valve 54 to ensure that the gas discharged from the proportional valve group 53 is discharged from the tail exhaust unit 6.

[0047] Optionally, the circulating gas supply unit further includes a second liquid regulating valve 57, a second heat exchanger 58 and a third sensor 59 which are sequentially connected in series on the circulating pipe 51. The second liquid regulating valve 57, the second heat exchanger 58 and the third sensor 59 are all located between the third one-way valve 56 and the second adapter 12. The third sensor 59 is used to monitor the temperature and pressure of one end of the second adapter 12. The third sensor 59 is respectively connected to the second liquid regulating valve 57 and the second heat exchanger 58 for communication. In this embodiment, the second liquid regulating valve 57 is used to adjust the pressure of the mixed gas entering the second adapter 12, the second heat exchanger 58 is used to adjust the temperature of the mixed gas entering the first adapter 11, and the third sensor 59 is a temperature and pressure sensor, which can monitor the temperature and pressure of the mixed gas entering the second adapter 12, and then transmit the monitored data to the second liquid regulating valve 57 and the third heat exchanger 72, so that the second liquid regulating valve 57 and the third heat exchanger 72 adjust their respective working states, and then keep the mixed gas entering the second adapter 12 at the set temperature and pressure.

[0048] Optionally, the circulating air supply unit further includes a humidity sensor 60, which is used to monitor the humidity at one end of the second adapter 12, and the humidity sensor 60 is in communication connection with the simulation component 32. In this embodiment, the humidity of the gas in the circulating air supply unit is regulated by the aqueous solution in the sealed tank 31, and the humidity of the mixed gas entering the second adapter 12 is monitored by the humidity sensor 60, and the information is then transmitted to the simulation component 32, and the simulation component 32 adjusts the temperature and water level of the aqueous solution, thereby achieving the regulation of the humidity of the mixed gas.

[0049] Optionally, the tail exhaust unit 6 further includes a gas-liquid separator 62, a second stop valve 63 and a fourth flowmeter 64. The gas-liquid separator 62 includes an air inlet, an air outlet and a gas-liquid outlet. The air inlet is connected to the proportional valve group 53, the air outlet is connected to the first stop valve 54, the gas-liquid outlet is connected to one end of the tail exhaust pipe 61, and the second stop valve 63 and the fourth flowmeter 64 are connected in series to the tail exhaust pipe 61. In this embodiment, after the mixed gas ejected from the third interface 35 of the sealed tank 31 enters the gas-liquid separator 62 through the air inlet, a part of it flows to the third transfer interface through the air outlet, and the other part directly flows to the tail exhaust pipe 61 through the gas-liquid outlet. In this process, part of the water in the mixed gas is liquefied and adheres to the pipe wall. Then, the gas-liquid separator 62 causes the part of the aqueous solution to flow out through the gas-liquid outlet. At the same time, the amount of the mixed gas entering the tail exhaust pipe 61 is equivalent to the amount of gas consumed during the stack reaction.

[0050] Optionally, the test platform 1 also includes a fourth adapter 14 and a fifth adapter 15; the fuel cell hydrogen system test device also includes a cooling unit, including a liquid pump 71 and a third heat exchanger 72, the liquid inlet of the liquid pump 71 is connected to one end of the fourth adapter 14, the liquid outlet of the liquid pump 71 is connected to the liquid inlet of the third heat exchanger 72, and the liquid outlet of the third heat exchanger 72 is connected to one end of the fifth adapter 15. In this embodiment, when the test piece is a hydrogen circulation pump, in order to dissipate heat for the hydrogen circulation pump, the other end of the fourth adapter 14 and the other end of the fifth adapter 15 are respectively connected to the coolant inlet and the coolant outlet of the hydrogen circulation pump. When the liquid pump 71 is working, the liquid pump 71 drives the cooling water to circulate in the cooling liquid path of the hydrogen circulation pump, and at the same time, the heat in the coolant is taken away through the third heat exchanger, so that the hydrogen circulation pump maintains the best working stability.

[0051] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. Fuel cell hydrogen system test device, characterized in that: include: A test platform (1) is used to set a test piece, comprising a first adapter (11), a second adapter (12) and a third adapter (13); A main gas supply unit (2), connected to one end of the first adapter (11) and used to provide a first gas to the test piece; A stack simulation unit (3) comprises a sealed tank (31) and a simulation component (32), wherein a water solution is arranged in the sealed tank (31), and the simulation component (32) is used to adjust the temperature and liquid level of the water solution in the sealed tank (31), and the sealed tank (31) comprises a first interface (33) and a second interface (34) located below the liquid level of the water solution, and a third interface (35) located above the liquid level of the water solution, and one end of the third adapter (13) is connected to the first interface (33); an auxiliary gas supply unit (4), which is in communication with the second interface (34) and is used to provide a second gas into the sealed tank (31); A circulating air supply unit, comprising a circulating pipe (51), used to connect the third interface (35) and one end of the second adapter (12), wherein the circulating air supply unit is capable of adjusting the air flow rate of the circulating pipe (51); The tail exhaust unit (6) comprises a tail exhaust pipe (61), one end of the tail exhaust pipe (61) is connected to the circulation pipe (51), and the other end is connected to the atmosphere. The tail exhaust unit (6) can adjust the on and off of the tail exhaust pipe (61).

2. The fuel cell hydrogen system testing device according to claim 1, characterized in that: The main air supply unit (2) comprises a main air supply pipe (21) and a first pressure reducing valve (22), a first non-return valve (23), an air storage tank (24) and a first flow meter (25) which are arranged in sequence on the main air supply pipe (21); one end of the main air supply pipe (21) close to the first flow meter (25) is connected to one end of the first adapter (11).

3. The fuel cell hydrogen system testing device according to claim 2, characterized in that: The main gas supply unit (2) further comprises a first liquid regulating valve (26), a first heat exchanger (27) and a first sensor (28); the first liquid regulating valve (26) and the first heat exchanger (27) are sequentially connected in series to the main gas supply pipe (21) and are located between the first flow meter (25) and the first adapter (11); the first sensor (28) is used to monitor the gas temperature and pressure at one end of the first adapter (11); the first sensor (28) is respectively connected to the first liquid regulating valve (26) and the first heat exchanger (27) for communication.

4. The fuel cell hydrogen system testing device according to claim 1, characterized in that: The auxiliary air supply unit (4) comprises an auxiliary air supply pipe (41) and a second pressure reducing valve (42), a second non-return valve (43) and a second flow meter (44) which are arranged on the auxiliary air supply pipe (41) in sequence; one end of the auxiliary air supply pipe (41) close to the second flow meter (44) is connected to the second interface (34).

5. The fuel cell hydrogen system testing device according to claim 1, characterized in that: The circulating air supply unit further comprises a second sensor (52) and a proportional valve group (53) which are sequentially connected in series on the circulating pipe (51); the second sensor (52) is used to monitor the temperature and pressure at the third interface (35); the second sensor (52) is communicatively connected to the proportional valve group (53).

6. The fuel cell hydrogen system testing device according to claim 5, characterized in that: The circulating air supply unit further comprises a first stop valve (54), a third flow meter (55) and a third one-way valve (56) which are sequentially connected in series on the circulating pipe (51); the first stop valve (54), the third flow meter (55) and the third one-way valve (56) are all located between the proportional valve group (53) and the second adapter (12).

7. The fuel cell hydrogen system testing device according to claim 6, characterized in that: The circulating air supply unit further comprises a second liquid regulating valve (57), a second heat exchanger (58) and a third sensor (59) which are sequentially connected in series on the circulating pipe (51); the second liquid regulating valve (57), the second heat exchanger (58) and the third sensor (59) are all located between the third one-way valve (56) and the second adapter (12); the third sensor (59) is used to monitor the temperature and pressure of one end of the second adapter (12); the third sensor (59) is respectively connected to communicate with the second liquid regulating valve (57) and the second heat exchanger (58).

8. The fuel cell hydrogen system testing device according to claim 1, characterized in that: The circulating air supply unit further comprises a humidity sensor (60), wherein the humidity sensor (60) is used to monitor the humidity at one end of the second adapter (12), and the humidity sensor (60) is communicatively connected to the simulation component (32).

9. The fuel cell hydrogen system testing device according to claim 6, characterized in that: The tail exhaust unit (6) further comprises a gas-liquid separator (62), a second stop valve (63) and a fourth flow meter (64); the gas-liquid separator (62) comprises an air inlet, an air outlet and a gas-liquid outlet; the air inlet is connected to the proportional valve group (53); the air outlet is connected to the first stop valve (54); the gas-liquid outlet is connected to one end of the tail exhaust pipe (61); the second stop valve (63) and the fourth flow meter (64) are connected in series to the tail exhaust pipe (61).

10. The fuel cell hydrogen system testing device according to claim 1, characterized in that: The test platform (1) further comprises a fourth adapter (14) and a fifth adapter (15); It also includes a cooling unit, including a liquid pump (71) and a third heat exchange element (72), wherein the liquid inlet of the liquid pump (71) is connected to one end of the fourth adapter (14), the liquid outlet of the liquid pump (71) is connected to the liquid inlet of the third heat exchange element (72), and the liquid outlet of the third heat exchange element (72) is connected to one end of the fifth adapter (15).

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