A fuel cell vibration test system and a test method

Abstract

The present invention belongs to the technical field of fuel cell testing, and discloses a fuel cell vibration testing system and a testing method. The fuel cell vibration testing system includes a vibration table and a helium supply system. The vibration table is used to load the fuel cell stack to be tested. Both ends of the input pipe are respectively connected to a helium tank and an input branch pipe assembly. A humidity meter assembly is arranged on the input branch pipe assembly. The input branch pipe assembly is connected to the material inlet of the fuel cell stack to be tested. A pressure sensor assembly is arranged on the output branch pipe assembly. The output branch pipe assembly is connected to the material outlet of the fuel cell stack to be tested. A three-way valve is arranged on the input pipe. Both ends of the return pipe are respectively connected to the three-way valve and the output branch pipe assembly. An air pump and a humidifier are arranged on the return pipe, and the air pump is located upstream of the humidifier. The present invention can improve the reliability of the fuel cell vibration test and make the vibration test closer to the actual driving conditions of the vehicle.

Description

Technical Field

[0001] The present invention relates to the technical field of fuel cell testing, and particularly to a fuel cell vibration testing system and a testing method. Background Art

[0002] There are various types of fuel cells, including alkaline fuel cells, phosphoric acid fuel cells, solid oxide fuel cells, methanol fuel cells, molten carbonate fuel cells, and proton exchange membrane fuel cells. The fuel of the proton exchange membrane fuel cell is hydrogen, so it is also called a hydrogen fuel cell. A hydrogen fuel cell vehicle means that the vehicle engine generates electric energy through the chemical reaction of hydrogen and oxygen. In practical applications, the performance of the hydrogen fuel cell is significantly affected by the road driving environment, such as road surface flatness, driving speed resonance, etc. Therefore, it is crucial to conduct vibration tests on the hydrogen fuel cell engine system for studying mechanical vibration reliability, system strength, system stiffness, and shock resistance performance, which is convenient for providing a judgment basis for the reliability, durability, and performance change of hydrogen fuel cell vehicles during actual road driving.

[0003] However, it is found during the research and development process that the national standard vibration test method for fuel cell stacks and the currently commonly used vibration test methods do not make special treatments for the inlet and outlet or the vibration state of the fuel cell stack. Usually, the inlet and outlet of the fuel cell are either sealed or directly opened, and it is fixed on the vibration device for vibration testing. To a certain extent, this does not conform to the vibration conditions during actual road driving. When the actual hydrogen fuel cell vehicle is running, the fuel cell stack is filled with reaction gases and water at a certain pressure, and the reaction gases will maintain a certain humidity. According to the traditional fuel cell stack vibration test method, there will be a certain deviation from the actual working state of the fuel cell stack. According to the vibration test method of GB / T33978 - 2017, after vibration, it is necessary to conduct airtightness, insulation, and protection tests on the fuel cell module to observe whether the test results meet the test requirements of GB / T 29838 - 2013. The humidity of the fuel cell stack will affect the gas permeability of the fuel cell membrane electrode, and whether the gas maintains the set humidity during vibration will have a certain impact on the airtightness result of the stack. At the same time, when the fuel cell stack is filled with gases at a certain pressure, the damage caused by mechanical vibration shock is also different from the vibration result under normal pressure, which further affects the reliability of vibration testing.

[0004] Therefore, there is an urgent need for a fuel cell vibration testing system and a testing method to improve the reliability of the vibration test of the fuel cell. Summary of the Invention

[0005] An object of the present invention is to provide a fuel cell vibration testing system and a testing method, which improve the reliability of the fuel cell vibration test and make the vibration test closer to the actual driving conditions of the vehicle.

[0006] To achieve this purpose, the present invention adopts the following technical solutions:

[0007] In a first aspect, a fuel cell vibration test system is provided, including:

[0008] A vibration table for loading the fuel cell stack to be tested;

[0009] A helium supply system, which includes a helium tank, an input pipe, an input branch pipe assembly, a hygrometer assembly, an output branch pipe assembly, a barometric pressure sensor assembly, and a return pipe. The two ends of the input pipe are respectively connected to the helium tank and the input branch pipe assembly. The hygrometer assembly is arranged on the input branch pipe assembly. The input branch pipe assembly is connected to the material inlet of the fuel cell stack to be tested. The barometric pressure sensor assembly is arranged on the output branch pipe assembly. The output branch pipe assembly is connected to the material outlet of the fuel cell stack to be tested. A three-way valve is arranged on the input pipe. The two ends of the return pipe are respectively connected to the three-way valve and the output branch pipe assembly. An air pump and a humidifier are arranged on the return pipe, and the air pump is located upstream of the humidifier.

[0010] As an optional technical solution, the material inlet of the fuel cell stack to be tested includes a hydrogen inlet, a cooling water inlet, and an air inlet. The input branch pipe assembly includes a first branch pipe, a second branch pipe, and a third branch pipe. The hygrometer assembly includes a first hygrometer, a second hygrometer, and a third hygrometer. The first branch pipe is connected to the hydrogen inlet, and a first throttle valve and the first hygrometer are arranged on the first branch pipe. The second branch pipe is connected to the cooling water inlet, and a second throttle valve and the second hygrometer are arranged on the second branch pipe. The third branch pipe is connected to the air inlet, and a third throttle valve and the third hygrometer are arranged on the third branch pipe;

[0011] The material outlet of the fuel cell stack to be tested includes a hydrogen outlet, a cooling water outlet, and an air outlet. The output branch pipe assembly includes a fourth branch pipe, a fifth branch pipe, and a sixth branch pipe. The barometric pressure sensor assembly includes a first barometric pressure sensor, a second barometric pressure sensor, and a third barometric pressure sensor. The fourth branch pipe is connected to the hydrogen outlet, and the first barometric pressure sensor and a fourth throttle valve are arranged on the fourth branch pipe. The fifth branch pipe is connected to the cooling water outlet, and the second barometric pressure sensor and a fifth throttle valve are arranged on the fifth branch pipe. The third barometric pressure sensor and a sixth throttle valve are arranged on the sixth branch pipe.

[0012] As an optional technical solution, the first throttle valve is located upstream of the first hygrometer, the second throttle valve is located upstream of the second hygrometer, and the third throttle valve is located upstream of the third hygrometer.

[0013] As an alternative technical solution, the fourth throttle valve is located downstream of the first air pressure sensor, the fifth throttle valve is located downstream of the second air pressure sensor, and the sixth throttle valve is located downstream of the third air pressure sensor.

[0014] As an alternative technical solution, a seventh throttle valve is further provided on the input pipe, and the seventh throttle valve is located downstream of the three-way valve.

[0015] As an alternative technical solution, a one-way valve is further provided on the input pipe, and the one-way valve is located upstream of the three-way valve.

[0016] In a second aspect, a testing method is provided, which is applied to the fuel cell vibration testing system as described above. The testing method includes the following steps:

[0017] S100. Open the first throttle valve, the fourth throttle valve, the seventh throttle valve, the one-way valve, and the three-way valve, close the second throttle valve, the third throttle valve, the fifth throttle valve, and the sixth throttle valve, start the helium gas tank, so that the air pressure in the fourth branch pipe reaches a first air pressure value, and the first air pressure sensor feeds back the first air pressure value. Then close the one-way valve, start the air pump and the humidifier, so that the humidity in the first branch pipe reaches a first humidity value, and the first hygrometer feeds back the first humidity value;

[0018] Open the second throttle valve, the fifth throttle valve, the seventh throttle valve, the one-way valve, and the three-way valve, close the first throttle valve, the third throttle valve, the fourth throttle valve, and the sixth throttle valve, start the helium gas tank, so that the air pressure in the fifth branch pipe reaches a second air pressure value, and the second air pressure sensor feeds back the second air pressure value. Then close the one-way valve, start the air pump and the humidifier, so that the humidity in the second branch pipe reaches a second humidity value, and the second hygrometer feeds back the second humidity value;

[0019] Open the third throttle valve, the sixth throttle valve, the seventh throttle valve, the one-way valve, and the three-way valve, close the first throttle valve, the second throttle valve, the fourth throttle valve, and the fifth throttle valve, start the helium gas tank, so that the air pressure in the sixth branch pipe reaches a third air pressure value, and the third air pressure sensor feeds back the third air pressure value. Then close the one-way valve, start the air pump and the humidifier, so that the humidity in the third branch pipe reaches a third humidity value, and the third hygrometer feeds back the third humidity value;

[0020] S200. Close the first throttle valve, the second throttle valve, the third throttle valve, the fourth throttle valve, the fifth throttle valve, the sixth throttle valve, the seventh throttle valve, the one-way valve, and the three-way valve, and drive the fuel cell stack under test through the vibration table;

[0021] S300. Obtain the fourth air pressure value feedback by the first air pressure sensor, the fifth air pressure value feedback by the second air pressure sensor, and the sixth air pressure value feedback by the third air pressure sensor, and compare the first air pressure difference between the first air pressure value and the fourth air pressure value, the second air pressure difference between the second air pressure value and the fifth air pressure value, and the third air pressure difference between the third air pressure value and the sixth air pressure value. The first air pressure difference is the air leakage amount at the hydrogen inlet, the second air pressure difference is the air leakage amount at the cooling water inlet, and the third air pressure difference is the air leakage amount at the air inlet.

[0022] As an optional technical solution, in the step S100, the first air pressure value, the second air pressure value, and the third air pressure value are equal, and the first humidity value, the second humidity value, and the third humidity value are equal.

[0023] As an optional technical solution, after the first hygrometer feeds back the first humidity value, the following steps are further included: S101. Close the air pump, the first throttle valve, and the fourth throttle valve;

[0024] After the second hygrometer feeds back the second humidity value, the following steps are further included: S102. Close the air pump, the second throttle valve, and the fifth throttle valve;

[0025] After the third hygrometer feeds back the third humidity value, the following steps are further included: S103. Close the air pump, the third throttle valve, and the sixth throttle valve.

[0026] As an optional technical solution, the test method further includes the following steps:

[0027] S400. Obtain the fourth humidity value feedback by the first hygrometer, the fifth humidity value feedback by the second hygrometer, and the sixth humidity value feedback by the third hygrometer, and compare the first humidity difference between the first humidity value and the fourth humidity value, the second humidity difference between the second humidity value and the fifth humidity value, and the third humidity difference between the third humidity value and the sixth humidity value. The first humidity difference is used as a reference value for the air leakage amount at the hydrogen inlet, the second humidity difference is used as a reference value for the air leakage amount at the cooling water inlet, and the third humidity difference is used as a reference value for the air leakage amount at the air inlet.

[0028] The beneficial effects of the present invention are as follows:

[0029] The present invention provides a fuel cell vibration test system and a test method. When operating the fuel cell vibration test system through this test method, first, helium is output from a helium gas cylinder. The physical property parameters of helium are similar to those of hydrogen, and its chemical property is inactive, making it safer than hydrogen. The helium output from the helium gas cylinder passes through the input pipe and the input branch pipe assembly and then enters the fuel cell stack to be tested. The air pressure data of the fuel cell stack to be tested before simulated vibration can be measured through the air pressure sensor assembly. After that, the helium gas cylinder is closed and the output of helium is stopped. The air pump and the humidifier are started. The humid air output by the air pump driven by the air pump passes through the input pipe and the input branch pipe assembly and then enters the fuel cell stack to be tested. The humidity data of the fuel cell stack to be tested before simulated vibration can be measured through the hygrometer assembly. After closing the air pump and the humidifier, the actual operating conditions of the vehicle are simulated through a vibration table, so that the fuel cell stack to be tested is simulated to vibrate. After the vibration ends, the air pressure data measured by the air pressure sensor assembly and the humidity data measured by the hygrometer assembly are recorded again, so as to judge the air pressure leakage value and the moisture leakage value. The present invention provides helium to the fuel cell stack to be tested through a helium gas cylinder, ensuring that the air pressure requirements are met and the safety is also ensured. The humid air is provided to the fuel cell stack to be tested through a humidifier, ensuring that the humidity requirements are met, improving the reliability of the fuel cell vibration test, and making the vibration test closer to the actual driving conditions of the vehicle. Description of the Drawings

[0030] The following further describes the present invention in detail according to the drawings and embodiments;

[0031] Figure 1 It is a structural layout diagram of the fuel cell vibration test system described in the embodiment.

[0032] In the figure:

[0033] 100. Fuel cell stack to be tested; 101. Hydrogen inlet; 102. Cooling water inlet; 103. Air inlet; 104. Hydrogen outlet; 105. Cooling water outlet; 106. Air outlet;

[0034] 1. Vibration table; 2. Helium gas cylinder; 3. Three-way valve; 4. Air pump; 5. Humidifier; 6. First throttle valve; 7. First hygrometer; 8. Second throttle valve; 9. Second hygrometer; 10. Third throttle valve; 11. Third hygrometer; 12. First air pressure sensor; 13. Fourth throttle valve; 14. Second air pressure sensor; 15. Fifth throttle valve; 16. Third air pressure sensor; 17. Sixth throttle valve; 18. Seventh throttle valve; 19. One-way valve. Detailed Embodiment

[0035] To make the technical problems solved by the present invention, the technical solutions adopted, and the achieved technical effects clearer, the technical solutions of the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative efforts belong to the scope of protection of the present invention.

[0036] In the description of the present invention, unless otherwise clearly defined and limited, the terms "connected", "connected", and "fixed" shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected, or indirectly connected through an intermediate medium, and it may be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0037] In the present invention, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through other features between them. Moreover, the first feature being "above", "above", and "on" the second feature includes that the first feature is directly above and obliquely above the second feature, or merely indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature being "below", "below", and "under" the second feature includes that the first feature is directly below and obliquely below the second feature, or merely indicates that the horizontal height of the first feature is lower than that of the second feature.

[0038] In the description herein, it should be understood that the orientation or positional relationships such as "above", "below", "left", "right", etc. are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of description and simplifying the operation, 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 thus should not be construed as a limitation to the present invention. In addition, the terms "first" and "second" are only used for distinction in description and have no special meanings.

[0039] In the description of this specification, the description referring to terms such as "an embodiment", "example", etc. means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic descriptions of the above terms do not necessarily refer to the same embodiment or example.

[0040] The technical solutions of the present invention will be further described below with reference to the accompanying drawings and through specific implementation manners.

[0041] In the process of research and development, it is found that for the national standard vibration test method of vehicle hydrogen fuel cell stacks and the currently commonly used vibration test methods, no special treatment is carried out on the inlet and outlet or the vibration state of the fuel cell stack. Usually, the inlet and outlet of the fuel cell are sealed or directly opened, and it is fixed on the vibration device for vibration testing. To a certain extent, this does not conform to the vibration conditions during actual road driving. When a hydrogen fuel cell vehicle is actually operating, the inside of the fuel cell stack is filled with reaction gases and water at a certain pressure, and the reaction gases will maintain a certain humidity. According to the traditional vibration test method of the fuel cell stack, there will be a certain deviation from the actual working state of the fuel cell stack. According to the vibration test method of GB / T33978-2017, after vibration, the fuel cell module needs to be tested for airtightness, insulation, and protection, and observe whether the test results meet the test requirements of GB / T29838-2013. The humidity of the fuel cell stack will affect the gas permeability of the fuel cell membrane electrode, and whether the gas maintains the set humidity during vibration will have a certain impact on the airtightness result of the stack. At the same time, when the fuel cell stack is filled with gases at a certain pressure, the damage caused by mechanical vibration shock is also different from the vibration result under normal pressure, thus affecting the reliability of the vibration test.

[0042] As Figure 1 shown, to solve the above technical problems, this embodiment provides a fuel cell vibration test system. The fuel cell vibration test system includes a vibration table 1 and a helium supply system. The vibration table 1 is used to load the fuel cell stack 100 to be tested; the helium supply system includes a helium tank 2, an input pipe, an input branch pipe assembly, a humidity meter assembly, an output branch pipe assembly, a pressure sensor assembly, and a return pipe. The two ends of the input pipe are respectively connected to the helium tank 2 and the input branch pipe assembly. The humidity meter assembly is arranged on the input branch pipe assembly. The input branch pipe assembly is connected to the material inlet of the fuel cell stack 100 to be tested. The pressure sensor assembly is arranged on the output branch pipe assembly. The output branch pipe assembly is connected to the material outlet of the fuel cell stack 100 to be tested. A three-way valve 3 is arranged on the input pipe. The two ends of the return pipe are respectively connected to the three-way valve 3 and the output branch pipe assembly. An air pump 4 and a humidifier 5 are arranged on the return pipe. The air pump 4 is located upstream of the humidifier 5.

[0043] Specifically, when operating the fuel cell vibration test system through this test method, first, helium is output from the helium tank 2. The valve port of the three-way valve 3 connected to the return pipe is closed, which can prevent helium from entering the return pipe to protect the humidifier 5 and the air pump 4. The physical property parameters of helium are similar to those of hydrogen. For example, the unit mass is close, and the chemical property of helium is inactive, which is safer than hydrogen. For example, it will not burn. The helium output from the helium tank 2 passes through the input pipe and the input branch pipe assembly and then enters the fuel cell stack 100 to be tested. The air pressure data of the fuel cell stack 100 to be tested before simulated vibration can be measured through the air pressure sensor assembly. Then, the helium tank 2 is closed to stop outputting helium. The valve port of the three-way valve 3 connected to the helium tank 2 is closed, and the valve port of the three-way valve 3 connected to the return pipe is opened, which can prevent moist air from entering the output port of the helium tank 2 to protect the helium tank 2 and prevent the helium tank 2 from rusting. The air pump 4 and the humidifier 5 are started. The moist air output by the humidifier 5 driven by the air pump 4 passes through the input pipe and the input branch pipe assembly and then enters the fuel cell stack 100 to be tested. The humidity data of the fuel cell stack 100 to be tested before simulated vibration can be measured through the hygrometer assembly. After closing the air pump 4 and the humidifier 5, the actual operating conditions of the vehicle are simulated through the vibration table 1, so that the fuel cell stack 100 to be tested is simulated to vibrate. After the vibration ends, the air pressure data measured by the air pressure sensor assembly and the humidity data measured by the hygrometer assembly are recorded again, so as to judge the air pressure leakage value and the moisture leakage value. In this embodiment, the helium tank 2 is used to provide helium for the fuel cell stack 100 to be tested, which ensures that the air pressure requirement is met and also ensures safety. The humidifier 5 is used to provide moist air for the fuel cell stack 100 to be tested, which ensures that the humidity requirement is met, improves the reliability of the fuel cell vibration test, and makes the vibration test closer to the actual driving conditions of the vehicle.

[0044] In this embodiment, the air pump 4 and the humidifier 5 are arranged on the return pipe. The air pump 4 can pump the moist air output by the humidifier 5 to the fuel cell stack 100 to be tested, improving the moist air delivery capacity. Moreover, the air pump 4 is arranged upstream of the humidifier 5 to prevent the moist air from being blocked by the air pump 4 itself during pumping.

[0045] In this embodiment, the material inlets of the fuel cell stack 100 to be measured include a hydrogen inlet 101, a cooling water inlet 102, and an air inlet 103. The input branch pipe assembly includes a first branch pipe, a second branch pipe, and a third branch pipe. The hygrometer assembly includes a first hygrometer 7, a second hygrometer 9, and a third hygrometer 11. The first branch pipe is connected to the hydrogen inlet 101, and a first throttle valve 6 and a first hygrometer 7 are provided on the first branch pipe. The second branch pipe is connected to the cooling water inlet 102, and a second throttle valve 8 and a second hygrometer 9 are provided on the second branch pipe. The third branch pipe is connected to the air inlet 103, and a third throttle valve 10 and a third hygrometer 11 are provided on the third branch pipe. The material outlets of the fuel cell stack 100 to be measured include a hydrogen outlet 104, a cooling water outlet 105, and an air outlet 106. The output branch pipe assembly includes a fourth branch pipe, a fifth branch pipe, and a sixth branch pipe. The air pressure sensor assembly includes a first air pressure sensor 12, a second air pressure sensor 14, and a third air pressure sensor 16. The fourth branch pipe is connected to the hydrogen outlet 104, and a first air pressure sensor 12 and a fourth throttle valve 13 are provided on the fourth branch pipe. The fifth branch pipe is connected to the cooling water outlet 105, and a second air pressure sensor 14 and a fifth throttle valve 15 are provided on the fifth branch pipe. A third air pressure sensor 16 and a sixth throttle valve 17 are provided on the sixth branch pipe.

[0046] In the prior art, when a vehicle loaded with a fuel cell stack for measurement is running, hydrogen enters the fuel cell stack for measurement through the hydrogen inlet 101, and air enters the fuel cell stack for measurement through the air inlet 103. The hydrogen and oxygen in the air are mixed and burned to generate heat, which is finally converted into mechanical energy to drive the vehicle forward. The cooling water enters the fuel cell stack for measurement through the cooling water inlet 102 to cool down the fuel cell stack for measurement.

[0047] When conducting tests, a test strategy of simultaneous vibration and airtightness testing is adopted, which significantly shortens the test time. That is, first, the humidity of the first branch pipe, the humidity of the second branch pipe, the humidity of the third branch pipe, the air pressure of the fourth branch pipe, the air pressure of the fifth branch pipe, and the air pressure of the sixth branch pipe are respectively detected. Then, vibration testing is carried out. Finally, the humidity of the first branch pipe, the humidity of the second branch pipe, the humidity of the third branch pipe, the air pressure of the fourth branch pipe, the air pressure of the fifth branch pipe, and the air pressure of the sixth branch pipe are respectively detected again. This is different from the existing test strategy of vibration first and then airtightness. In the existing test strategy of vibration first and then airtightness, the fuel cell stack needs to be transported among different test devices and fixedly installed, resulting in a long time-consuming and inefficient vibration test. In this embodiment, the vibration test requires the fuel cell stack 100 to be tested to be filled with high-pressure gas itself, and the pressure difference data before and after the airtightness test can be directly read through the air pressure sensor assembly, which can significantly shorten the test time and improve the test efficiency. During actual testing, according to the vibration test specification of GB / T 33978-2017, the test time can be shortened by about 21.1%. At the same time, the influence of the internal gas humidity of the fuel cell stack 100 to be tested on the gas permeability of the fuel cell membrane electrode and the influence of the actual working condition gas pressure are considered, improving the accuracy of the vibration test. The airtightness test error is reduced from 8.11% to 6.20%. Moreover, the fuel cell vibration test system structure in this embodiment is safe and stable. Compared with the hydrogen-related test under actual working conditions, the fuel cell vibration test system in this embodiment is not affected by environmental restrictions. For example, hydrogen has an explosion risk when encountering an electric spark, while helium does not have an explosion risk.

[0048] The accuracy comparison table of the fuel cell vibration test system in this embodiment with the existing vibration system and the actual measurement system is as follows:

[0049]

[0050]

[0051] Optionally, the first throttle valve 6 is located upstream of the first hygrometer 7, the second throttle valve 8 is located upstream of the second hygrometer 9, and the third throttle valve 10 is located upstream of the third hygrometer 11. When the hydrogen inlet 101 does not need to input helium or humid air, the first throttle valve 6 is closed, and neither helium nor humid air can affect the first hygrometer 7. For example, it can avoid the first hygrometer 7 from mismeasuring humidity. When the cooling water inlet 102 does not need to input helium or humid air, the second throttle valve 8 is closed, and neither helium nor humid air can affect the second hygrometer 9. For example, it can avoid the second hygrometer 9 from mismeasuring humidity. When the air inlet 103 does not need to input helium or humid air, the third throttle valve 10 is closed, and neither helium nor humid air can affect the third hygrometer 11. For example, it can avoid the third hygrometer 11 from mismeasuring humidity.

[0052] Optionally, the fourth throttle valve 13 is located downstream of the first air pressure sensor 12, the fifth throttle valve 15 is located downstream of the second air pressure sensor 14, and the sixth throttle valve 17 is located downstream of the third air pressure sensor 16. After closing the fourth throttle valve 13, it does not affect the air pressure detection value of the first air pressure sensor 12 in the fourth branch pipe. After closing the fifth throttle valve 15, it does not affect the air pressure detection value of the second air pressure sensor 14 in the fifth branch pipe. After closing the sixth throttle valve 17, it does not affect the air pressure detection value of the third air pressure sensor 16 in the sixth branch pipe.

[0053] Optionally, a seventh throttle valve 18 is further provided on the input pipe, and the seventh throttle valve 18 is located downstream of the three-way valve 3. The seventh throttle valve 18 is used to close or open the input pipe.

[0054] Specifically, the flow rate of helium and humid air in the first branch pipe can be adjusted by adjusting the opening degree of the first throttle valve 6, the flow rate of helium and humid air in the second branch pipe can be adjusted by adjusting the opening degree of the second throttle valve 8, the flow rate of helium and humid air in the third branch pipe can be adjusted by adjusting the opening degree of the third throttle valve 10, the flow rate of helium and humid air in the fourth branch pipe can be adjusted by adjusting the opening degree of the fourth throttle valve 13, the flow rate of helium and humid air in the fifth branch pipe can be adjusted by adjusting the opening degree of the fifth throttle valve 15, the flow rate of helium and humid air in the sixth branch pipe can be adjusted by adjusting the opening degree of the sixth throttle valve 17, and the flow rate of helium and humid air in the input pipe can be adjusted by adjusting the opening degree of the seventh throttle valve 18.

[0055] Optionally, a one-way valve 19 is further provided on the input pipe, and the one-way valve 19 is located upstream of the three-way valve 3. The helium output from the helium tank 2 can pass through the one-way valve 19 and enter the three-way valve 3, and the humid air passing through the three-way valve 3 cannot flow back through the one-way valve 19 and enter the helium tank 2.

[0056] This embodiment also provides a test method, which is applied to the fuel cell vibration test system of this embodiment. The test method includes the following steps:

[0057] S100. Open the first throttle valve 6, the fourth throttle valve 13, the seventh throttle valve 18, the one-way valve 19, and the three-way valve 3. Close the second throttle valve 8, the third throttle valve 10, the fifth throttle valve 15, and the sixth throttle valve 17. Start the helium gas tank 2 to make the air pressure in the fourth branch pipe reach the first air pressure value, and the first air pressure sensor 12 feeds back the first air pressure value. Then close the one-way valve 19, start the air pump 4 and the humidifier 5 to make the humidity in the first branch pipe reach the first humidity value, and the first hygrometer 7 feeds back the first humidity value. Open the second throttle valve 8, the fifth throttle valve 15, the seventh throttle valve 18, the one-way valve 19, and the three-way valve 3. Close the first throttle valve 6, the third throttle valve 10, the fourth throttle valve 13, and the sixth throttle valve 17. Start the helium gas tank 2 to make the air pressure in the fifth branch pipe reach the second air pressure value, and the second air pressure sensor 14 feeds back the second air pressure value. Then close the one-way valve 19, start the air pump 4 and the humidifier 5 to make the humidity in the second branch pipe reach the second humidity value, and the second hygrometer 9 feeds back the second humidity value. Open the third throttle valve 10, the sixth throttle valve 17, the seventh throttle valve 18, the one-way valve 19, and the three-way valve 3. Close the first throttle valve 6, the second throttle valve 8, the fourth throttle valve 13, and the fifth throttle valve 15. Start the helium gas tank 2 to make the air pressure in the sixth branch pipe reach the third air pressure value, and the third air pressure sensor 16 feeds back the third air pressure value. Then close the one-way valve 19, start the air pump 4 and the humidifier 5 to make the humidity in the third branch pipe reach the third humidity value, and the third hygrometer 11 feeds back the third humidity value.

[0058] S200. Close the first throttle valve 6, the second throttle valve 8, the third throttle valve 10, the fourth throttle valve 13, the fifth throttle valve 15, the sixth throttle valve 17, the seventh throttle valve 18, the one-way valve 19, and the three-way valve 3, and drive the fuel cell stack 100 to be tested by the vibration table 1.

[0059] S300. Obtain the fourth air pressure value fed back by the first air pressure sensor 12, the fifth air pressure value fed back by the second air pressure sensor 14, and the sixth air pressure value fed back by the third air pressure sensor 16. Compare the first air pressure difference between the first air pressure value and the fourth air pressure value, the second air pressure difference between the second air pressure value and the fifth air pressure value, and the third air pressure difference between the third air pressure value and the sixth air pressure value. The first air pressure difference is the leakage amount of the hydrogen inlet 101, the second air pressure difference is the leakage amount of the cooling water inlet 102, and the third air pressure difference is the leakage amount of the air inlet 103. The above test method steps can improve the test efficiency and reduce the test error.

[0060] Optionally, in step S100, the first air pressure value, the second air pressure value, and the third air pressure value are equal, and the first humidity value, the second humidity value, and the third humidity value are equal.

[0061] Optionally, after the first hygrometer 7 feeds back the first humidity value, the method further includes the steps of: S101, closing the air pump 4, the first throttle valve 6 and the fourth throttle valve 13.

[0062] Optionally, after the second hygrometer 9 feeds back the second humidity value, the method further includes the steps of: S102, closing the air pump 4, the second throttle valve 8 and the fifth throttle valve 15.

[0063] Optionally, after the third hygrometer 11 feeds back the third humidity value, the method further includes the steps of: S103, closing the air pump 4, the third throttle valve 10 and the sixth throttle valve 17.

[0064] Optionally, the test method further includes the following steps: S400, obtaining the fourth humidity value fed back by the first hygrometer 7, the fifth humidity value fed back by the second hygrometer 9, and the sixth humidity value fed back by the third hygrometer 11, comparing the first humidity difference between the first humidity value and the fourth humidity value, the second humidity difference between the second humidity value and the fifth humidity value, and the third humidity difference between the third humidity value and the sixth humidity value, taking the first humidity difference as a reference value for the air leakage amount of the hydrogen inlet 101, taking the second humidity difference as a reference value for the air leakage amount of the cooling water inlet 102, and taking the third humidity difference as a reference value for the air leakage amount of the air inlet 103.

[0065] In addition, the above are only the preferred embodiments of the present invention and the technical principles applied. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, re-adjustments and substitutions can be made by those skilled in the art without departing from the protection scope of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments only. Without departing from the concept of the present invention, more other equivalent embodiments can be included, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A test method applied to a fuel cell vibration test system, characterized in that, The fuel cell vibration test system includes: A vibration table (1) for loading the fuel cell stack (100) to be tested; A helium supply system, which includes a helium tank (2), an input pipe, an input branch pipe assembly, a hygrometer assembly, an output branch pipe assembly, a barometric pressure sensor assembly, and a return pipe. The two ends of the input pipe are respectively connected to the helium tank (2) and the input branch pipe assembly. The hygrometer assembly is arranged on the input branch pipe assembly. The input branch pipe assembly is connected to the material inlet of the fuel cell stack (100) to be tested. The barometric pressure sensor assembly is arranged on the output branch pipe assembly. The output branch pipe assembly is connected to the material outlet of the fuel cell stack (100) to be tested. A three-way valve (3) is arranged on the input pipe. The two ends of the return pipe are respectively connected to the three-way valve (3) and the output branch pipe assembly. An air pump (4) and a humidifier (5) are arranged on the return pipe, and the air pump (4) is located upstream of the humidifier (5); The material inlet of the fuel cell stack (100) to be tested includes a hydrogen inlet (101), a cooling water inlet (102), and an air inlet (103). The input branch pipe assembly includes a first branch pipe, a second branch pipe, and a third branch pipe. The hygrometer assembly includes a first hygrometer (7), a second hygrometer (9), and a third hygrometer (11). The first branch pipe is connected to the hydrogen inlet (101), and a first throttle valve (6) and the first hygrometer (7) are arranged on the first branch pipe. The second branch pipe is connected to the cooling water inlet (102), and a second throttle valve (8) and the second hygrometer (9) are arranged on the second branch pipe. The third branch pipe is connected to the air inlet (103), and a third throttle valve (10) and the third hygrometer (11) are arranged on the third branch pipe; The material outlet of the fuel cell stack (100) to be tested includes a hydrogen outlet (104), a cooling water outlet (105), and an air outlet (106). The output branch pipe assembly includes a fourth branch pipe, a fifth branch pipe, and a sixth branch pipe. The barometric pressure sensor assembly includes a first barometric pressure sensor (12), a second barometric pressure sensor (14), and a third barometric pressure sensor (16). The fourth branch pipe is connected to the hydrogen outlet (104), and the first barometric pressure sensor (12) and a fourth throttle valve (13) are arranged on the fourth branch pipe. The fifth branch pipe is connected to the cooling water outlet (105), and the second barometric pressure sensor (14) and a fifth throttle valve (15) are arranged on the fifth branch pipe. The third barometric pressure sensor (16) and a sixth throttle valve (17) are arranged on the sixth branch pipe; A seventh throttle valve (18) is further arranged on the input pipe, and the seventh throttle valve (18) is located downstream of the three-way valve (3); A one-way valve (19) is further arranged on the input pipe, and the one-way valve (19) is located upstream of the three-way valve (3); The test method includes the following steps: S100. Open the first throttle valve (6), the fourth throttle valve (13), the seventh throttle valve (18), the one-way valve (19) and the three-way valve (3), close the second throttle valve (8), the third throttle valve (10), the fifth throttle valve (15) and the sixth throttle valve (17), start the helium gas tank (2) to make the air pressure in the fourth branch pipe reach the first air pressure value, and the first air pressure sensor (12) feeds back the first air pressure value. Then close the one-way valve (19), start the air pump (4) and the humidifier (5) to make the humidity in the first branch pipe reach the first humidity value, and the first hygrometer (7) feeds back the first humidity value; Open the second throttle valve (8), the fifth throttle valve (15), the seventh throttle valve (18), the one-way valve (19) and the three-way valve (3), close the first throttle valve (6), the third throttle valve (10), the fourth throttle valve (13) and the sixth throttle valve (17), start the helium gas tank (2) to make the air pressure in the fifth branch pipe reach the second air pressure value, and the second air pressure sensor (14) feeds back the second air pressure value. Then close the one-way valve (19), start the air pump (4) and the humidifier (5) to make the humidity in the second branch pipe reach the second humidity value, and the second hygrometer (9) feeds back the second humidity value; Open the third throttle valve (10), the sixth throttle valve (17), the seventh throttle valve (18), the one-way valve (19) and the three-way valve (3), close the first throttle valve (6), the second throttle valve (8), the fourth throttle valve (13) and the fifth throttle valve (15), start the helium gas tank (2) to make the air pressure in the sixth branch pipe reach the third air pressure value, and the third air pressure sensor (16) feeds back the third air pressure value. Then close the one-way valve (19), start the air pump (4) and the humidifier (5) to make the humidity in the third branch pipe reach the third humidity value, and the third hygrometer (11) feeds back the third humidity value; S200. Close the first throttle valve (6), the second throttle valve (8), the third throttle valve (10), the fourth throttle valve (13), the fifth throttle valve (15), the sixth throttle valve (17), the seventh throttle valve (18), the one-way valve (19) and the three-way valve (3), and drive the fuel cell stack under test (100) by the vibration table (1); S300. Obtain the fourth air pressure value feedback by the first air pressure sensor (12), the fifth air pressure value feedback by the second air pressure sensor (14), and the sixth air pressure value feedback by the third air pressure sensor (16). Compare the first air pressure difference between the first air pressure value and the fourth air pressure value, the second air pressure difference between the second air pressure value and the fifth air pressure value, and the third air pressure difference between the third air pressure value and the sixth air pressure value. The first air pressure difference is the air leakage amount of the hydrogen inlet (101), the second air pressure difference is the air leakage amount of the cooling water inlet (102), and the third air pressure difference is the air leakage amount of the air inlet (103).

2. The test method according to claim 1, characterized in that, The first throttle valve (6) is located upstream of the first hygrometer (7), the second throttle valve (8) is located upstream of the second hygrometer (9), and the third throttle valve (10) is located upstream of the third hygrometer (11).

3. The test method according to claim 1, wherein The fourth throttle valve (13) is located downstream of the first air pressure sensor (12), the fifth throttle valve (15) is located downstream of the second air pressure sensor (14), and the sixth throttle valve (17) is located downstream of the third air pressure sensor (16).

4. The test method according to claim 1, characterized in that, In the step S100, the first air pressure value, the second air pressure value, and the third air pressure value are equal, and the first humidity value, the second humidity value, and the third humidity value are equal.

5. The test method according to claim 4, characterized in that After the first hygrometer (7) feeds back the first humidity value, the following steps are further included: S101. Close the air pump (4), the first throttle valve (6), and the fourth throttle valve (13). After the second hygrometer (9) feeds back the second humidity value, the following steps are further included: S102. Close the air pump (4), the second throttle valve (8), and the fifth throttle valve (15). After the third hygrometer (11) feeds back the third humidity value, the following steps are further included: S103. Close the air pump (4), the third throttle valve (10), and the sixth throttle valve (17).

6. The test method according to claim 1, characterized in that, The test method further includes the following steps: S400. Obtain the fourth humidity value feedback by the first hygrometer (7), the fifth humidity value feedback by the second hygrometer (9), and the sixth humidity value feedback by the third hygrometer (11). Compare the first humidity difference between the first humidity value and the fourth humidity value, the second humidity difference between the second humidity value and the fifth humidity value, and the third humidity difference between the third humidity value and the sixth humidity value. The first humidity difference is used as a reference value for the air leakage amount of the hydrogen inlet (101), the second humidity difference is used as a reference value for the air leakage amount of the cooling water inlet (102), and the third humidity difference is used as a reference value for the air leakage amount of the air inlet (103).

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