Hydrogen pipe penetration test system and method

Abstract

The present application discloses a hydrogen pipe permeation test system and method, the hydrogen pipe permeation test system includes a hydrogen permeation collection device, a test pipeline, a temperature regulating module, a hydrogen supply module, an exhaust module, a humidification module and a circulating power element. The hydrogen permeation collection device is used to install the hydrogen pipe to be tested to collect the hydrogen permeated from the hydrogen pipe to be tested. The hydrogen permeation collection device is provided with a hydrogen concentration sensor, and the hydrogen concentration detected by the hydrogen concentration sensor can be used to calculate the hydrogen permeation characteristics of the hydrogen pipe to be tested. The test pipeline is connected to the hydrogen pipe to be tested to form a test loop. The actual application conditions of the hydrogen pipe to be tested can be simulated in the test loop through the hydrogen supply module, the exhaust module, the humidification module, the temperature regulating module and the circulating power element. The hydrogen permeation amount of the hydrogen pipe to be tested is tested under the hydrogen conditions of the same pressure, temperature and humidity as the actual application conditions of the fuel cell system, so as to judge the hydrogen permeation characteristics of rubber hoses of different materials.

Description

Technical Field

[0001] The present application belongs to the technical field of testing devices, and in particular, relates to a hydrogen pipe permeation testing system and method. Background Art

[0002] As global environmental and energy issues become increasingly severe, fuel cell vehicles are considered to be the most promising energy power devices in the future due to their advantages such as being pollution-free, high energy conversion efficiency, and a wide range of raw material sources.

[0003] At present, fuel cell systems generally use rubber pipes or silicone pipes to transport hydrogen. However, due to the relatively small molecular weight of hydrogen, ordinary polymer pipe materials cannot completely seal hydrogen, and hydrogen will permeate along the pipe wall. If the permeated hydrogen gathers in a certain area, there will be safety risks. Therefore, it is necessary to study the hydrogen permeation characteristics of hydrogen pipes.

[0004] In the prior art, the research on hydrogen permeation characteristics is mostly focused on the field of hydrogen storage technology, and no relevant test results on the hydrogen permeation characteristics of hydrogen pipes are found. Summary of the invention

[0005] The present application aims to solve at least one of the technical problems existing in the prior art. To this end, the present application proposes a hydrogen pipe permeation test system and method to test the hydrogen permeation characteristics of the hydrogen pipe.

[0006] In a first aspect of the present application, a hydrogen pipe permeation test system is provided, comprising:

[0007] A hydrogen permeation collection device, used to install the hydrogen pipe to be measured, and equipped with a hydrogen concentration sensor;

[0008] A test pipeline, connected to the hydrogen pipe to be tested, to form a test loop;

[0009] A hydrogen supply module, connected to the test pipeline, for providing hydrogen to the test loop;

[0010] An air extraction module, connected to the test pipeline, for extracting gas from the test circuit;

[0011] A humidification module, connected to the test pipeline, for humidifying the hydrogen in the test loop;

[0012] a temperature regulating module, which exchanges heat with the test pipeline and is used to regulate the temperature of the hydrogen in the test loop; and

[0013] The circulation power element is connected to the test pipeline and is used to drive the hydrogen to circulate in the test loop.

[0014] In some embodiments, the hydrogen permeation collection device includes a box body, a box cover and a joint unit sealed to the box body, one end of the joint unit is connected to the test pipeline, and the other end is connected to the hydrogen pipe to be tested; the hydrogen concentration sensor is sealed and installed on the box cover.

[0015] In some embodiments, the joint unit includes a connecting pipe and a joint pipe that are sealed and connected, the connecting pipe is connected to the test pipeline, and the tested hydrogen pipe is sealed and sleeved on the joint pipe.

[0016] In some embodiments, both ends of the connecting pipe and the first end of the connecting pipe are provided with chucks, and the chucks of the connecting pipe and the chucks of the connecting pipe clamp the sealing gasket together and are locked by a sealing buckle; the hydrogen pipe to be measured is sleeved on the second end of the connecting pipe and locked by a clamp.

[0017] In some embodiments, the temperature regulating module includes a heat exchange device, a heating element, a circulating water pump, and a radiator assembly connected through a pipeline, and the test pipeline exchanges heat with the heat exchange device.

[0018] In some embodiments, the hydrogen pipe permeation test system further includes a throttle valve connected to the test pipeline and located between the hydrogen permeation collection device and the circulation power element.

[0019] In some embodiments, the hydrogen pipe permeation testing system further comprises:

[0020] A first temperature sensor is provided in the test pipeline and is located between the hydrogen permeation collection device and the throttle valve;

[0021] A second temperature sensor, disposed in the test pipeline and located upstream of the temperature regulating module;

[0022] A first pressure sensor, disposed in the test pipeline and located between the hydrogen permeation collection device and the throttle valve;

[0023] The second pressure sensor is arranged in the test pipeline and located between the circulation power element and the temperature adjustment module.

[0024] In a second aspect of the present application, a hydrogen pipe permeation test method implemented based on the hydrogen pipe permeation test system of the first aspect is provided, comprising the following steps:

[0025] The hydrogen pipe to be tested is installed in the hydrogen permeation collection device and connected with the test pipeline to form the test loop;

[0026] Extracting the gas in the test circuit through the gas extraction module;

[0027] Provide hydrogen to the test loop through the hydrogen supply module, and humidify the hydrogen in the test loop through the humidification module;

[0028] Controlling the circulation power element and the temperature adjustment module to operate so that the hydrogen flows in the test loop and the hydrogen at the inlet end of the hydrogen pipe to be tested reaches a set pressure and a set temperature;

[0029] The set pressure and the set temperature are maintained, the hydrogen concentration inside the hydrogen permeation collection device is detected by the hydrogen concentration sensor, and the hydrogen permeation characteristics of the hydrogen pipe under test are obtained according to the hydrogen concentration.

[0030] In some embodiments, when the hydrogen pipe permeation test method is implemented based on the hydrogen pipe permeation test system of certain embodiments of the first aspect, controlling the cycle power element and the temperature adjustment module to operate so that the hydrogen at the inlet end of the hydrogen pipe under test reaches a set pressure and a set temperature specifically includes:

[0031] Controlling the operation of the heating element and the circulating water pump to heat the water temperature in the heat exchange device to the set temperature;

[0032] The circulation power element is controlled to operate, and the opening of the throttle valve is adjusted until the pressure of the hydrogen at the inlet end of the hydrogen pipe to be tested reaches the set pressure.

[0033] In some embodiments, maintaining the set pressure and the set temperature specifically includes:

[0034] Turning off the heating element and controlling the operation of the radiator assembly so that the temperature of the hydrogen at the inlet end of the hydrogen pipe to be tested is maintained at the set temperature;

[0035] The rotation speed of the circulating power element is adjusted so that the pressure of the hydrogen at the inlet end of the hydrogen pipe to be tested maintains the set pressure; if the circulating power element reaches the maximum rotation speed and the pressure of the hydrogen at the inlet end of the hydrogen pipe to be tested is still less than the set pressure, hydrogen is supplemented into the test loop through the hydrogen supply module while the rotation speed of the circulating power element is reduced so that the pressure of the hydrogen at the inlet end of the hydrogen pipe to be tested maintains the set pressure.

[0036] In some embodiments, when the hydrogen pipe permeation test method is implemented based on the hydrogen pipe permeation test system of certain embodiments of the first aspect, controlling the cycle power element and the temperature adjustment module to operate so that the hydrogen at the inlet end of the hydrogen pipe under test reaches a set pressure and a set temperature; maintaining the set temperature; specifically includes:

[0037] Controlling the operation of the circulating power element and adjusting the opening of the throttle valve until the pressure of the hydrogen at the inlet end of the hydrogen pipe to be tested reaches the set pressure;

[0038] The circulating water pump is controlled to operate, and the heating element and / or the radiator assembly is controlled to operate, so as to heat the water temperature in the heat exchange device to the set temperature and maintain it at the set temperature.

[0039] In some embodiments, the set pressure and the set temperature are respectively the pressure and humidity of hydrogen gas entering the stack of the fuel cell system under the same working conditions;

[0040] The hydrogen pipe permeation test method also includes: using the pressure and humidity of the hydrogen entering the fuel cell stack of the fuel cell system under other working conditions as new set pressure and set temperature, repeating the above steps to obtain the hydrogen permeation characteristics of the hydrogen pipe under the current working conditions.

[0041] According to one or more embodiments of the present application, a hydrogen pipe permeation test system is provided, including a hydrogen permeation collection device, a test pipeline, a temperature regulating module for heat exchange with the test pipeline, and a hydrogen supply module, an exhaust module, a humidification module and a circulation power element that are all connected to the test pipeline. The hydrogen permeation collection device is used to install the hydrogen pipe to be tested to collect the hydrogen permeated from the hydrogen pipe to be tested. The hydrogen permeation collection device is provided with a hydrogen concentration sensor, and the hydrogen concentration detected by the hydrogen concentration sensor can calculate the hydrogen permeation characteristics of the hydrogen pipe to be tested. The test pipeline is connected to the hydrogen pipe to be tested to form a test loop, the hydrogen supply module is used to provide hydrogen to the test loop, the exhaust module is used to extract the gas in the test loop, the humidification module is used to humidify the hydrogen in the test loop, the temperature regulating module is used to adjust the temperature of the hydrogen in the test loop, and the circulation power element is used to drive the hydrogen to circulate in the test loop. Through the hydrogen supply module, the exhaust module, the humidification module, the temperature regulating module and the circulation power element, the actual application conditions of the hydrogen pipe to be tested can be simulated in the test loop, that is, the hydrogen with the same pressure, temperature and humidity as the actual application conditions flows inside the test loop.

[0042] The hydrogen pipe permeation test system provided according to one or more embodiments of the present application can simulate the actual application conditions of the hydrogen pipe under test, and test the hydrogen permeation of the hydrogen pipe under test under hydrogen conditions of pressure, temperature and humidity that are the same as the actual application conditions of the fuel cell system, thereby determining the hydrogen permeation characteristics of rubber hoses of different materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following is a brief introduction to the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0044] Figure 1 A structural block diagram of a hydrogen pipe permeation test system in one or more embodiments of the present application is shown.

[0045] Figure 2 A schematic diagram of the connection structure between a hydrogen permeation collection device and a hydrogen pipe to be tested in a hydrogen pipe permeation test system in one or more embodiments of the present application is shown.

[0046] Figure 3 A schematic diagram of the connection structure between a hydrogen permeation collection device and a hydrogen pipe to be tested in a hydrogen pipe permeation test system in other embodiments of the present application is shown.

[0047] Figure 4 Shows Figure 2 and Figure 3 Schematic diagram of the structure of the box cover of the hydrogen permeation collection device.

[0048] Explanation of reference numerals: 100-hydrogen pipe penetration test system, 101-test circuit; 110-hydrogen permeation collection device; 111-box body, 1111-box wall; 112-box cover, 1121-positioning platform, 1122-through hole, 1123-sealing groove; 113-connector unit, 1131-connecting pipe, 1132-connector pipe, 1133-chuck, 1134-sealing gasket, 1135-sealing buckle; 114-discharge valve; 120-test pipeline; 130-hydrogen supply module, 131-hydrogen storage device, 132-hydrogen Ejector; 140-air extraction module, 141-vacuum pump, 142-air extraction switch valve; 150-humidification module, 151-injection device, 152-humidification switch valve; 160-temperature adjustment module, 161-heat exchange device, 162-heating element, 163-circulating water pump, 164-radiator assembly; 170-circulating power element; 180-throttle; 191-hydrogen concentration sensor, 192-first temperature sensor, 193-second temperature sensor, 194-first pressure sensor, 195-second pressure sensor. 10-tested hydrogen pipe, 20-clamp. DETAILED DESCRIPTION

[0049] In order to make the technical personnel in the technical field to which the present application belongs to understand the present application more clearly, the technical scheme in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0050] In addition, the present application may repeat reference numbers and / or reference letters in different examples, and such repetition is for the purpose of simplicity and clarity, and does not in itself indicate the relationship between the various embodiments and / or settings discussed. In addition, the present application provides various specific examples of processes and materials, but those of ordinary skill in the art may recognize the application of other processes and / or the use of other materials.

[0051] The first aspect of the present application provides a hydrogen pipe permeation test system for testing the hydrogen permeation characteristics of a soft rubber tube used to transport hydrogen in a fuel cell system. The hydrogen subsystem of the fuel cell system can be divided into a low-pressure part and a high-pressure part according to the pressure of the hydrogen. Among them: the hydrogen bottle and the pressure reducing valve and the pipeline between the two belong to the high-pressure part. The hydrogen pressure in the pipeline of the high-pressure part is relatively large, so the pipeline adopts a metal pipeline, such as a stainless steel pipeline; the pipeline and accessories connected from the hydrogen pump to the anode inlet of the stack and the anode outlet of the stack are all low-pressure parts. The pipeline of the low-pressure part generally adopts a soft rubber tube, which has a larger diameter than that of the metal pipe and is easy to bend, which is convenient for pipeline layout. The materials of the currently commonly used soft rubber tubes include silicone, EPDM (ethylene propylene rubber), fluororubber, and nitrile rubber.

[0052] Figure 1 The structure diagram of the hydrogen pipe permeation test system 100 of the present application is shown. Figure 1The hydrogen pipe permeation test system 100 includes a hydrogen permeation collection device 110, a test pipeline 120, a temperature regulating module 160 for heat exchange with the test pipeline 120, and a hydrogen supply module 130, an exhaust module 140, a humidification module 150 and a circulation power element 170 all connected to the test pipeline 120. The hydrogen permeation collection device 110 is used to install the hydrogen pipe 10 to be tested to collect hydrogen permeated from the hydrogen pipe 10 to be tested. The hydrogen permeation collection device 110 is provided with a hydrogen concentration sensor 191. The hydrogen concentration detected by the hydrogen concentration sensor 191 can calculate the hydrogen permeation characteristics of the hydrogen pipe 10 to be tested. The test pipeline 120 is connected to the hydrogen pipe 10 to be tested to form a test loop 101. The hydrogen supply module 130, the air extraction module 140, the humidification module 150, the temperature adjustment module 160 and the circulation power element 170 are used to simulate the actual application conditions of the hydrogen pipe 10 to be tested in the test loop 101, so that hydrogen with the same pressure, temperature and humidity as the actual application conditions flows inside the test loop 101. Testing the hydrogen permeation of the hydrogen pipe 10 to be tested under the hydrogen conditions of the same pressure, temperature and humidity as the actual application conditions of the fuel cell system can more comprehensively understand the hydrogen permeation characteristics of rubber hoses of different materials under different conditions.

[0053] The main function of the hydrogen permeation collection device 110 is to install the hydrogen pipe 10 to be tested and collect the hydrogen permeation. Therefore, it is necessary to facilitate the installation of the hydrogen pipe 10 to be tested and the hydrogen concentration sensor 191, and to have good sealing performance. The hydrogen permeation collection device 110 adopts a split structure, which is convenient for installing the hydrogen pipe 10 to be tested and the hydrogen concentration sensor 191. The hydrogen pipe 10 to be tested and the hydrogen concentration sensor 191 can be installed on different parts of the hydrogen permeation collection device 110. Considering that hydrogen is lighter than air, the hydrogen concentration sensor 191 should be installed on the top of the hydrogen permeation collection device 110.

[0054] Please refer to Figure 2 In some embodiments, the hydrogen permeation collection device 110 includes a box body 111, a box cover 112 and a joint unit 113 sealed with the box body 111, one end of the joint unit 113 is connected to the test pipeline 120, and the other end is connected to the hydrogen pipe 10 to be tested. The box body 111 and the box cover 112 are both provided with sealing surfaces with high surface quality. The sealing surfaces of the box body 111 and the box cover 112 are attached to and squeeze the sealing ring. A plurality of threaded fasteners are arranged at intervals on the periphery of the sealing ring to lock the box body 111 and the box cover 112.

[0055] See also Figure 2 and Figure 3In some embodiments, the box cover 112 is provided with a protruding positioning platform 1121, the positioning platform 1121 protrudes outward relative to the sealing surface of the box cover 112, the positioning platform 1121 extends into the inner cavity of the box body 111, and fits with the box wall 1111 of the box body 111. In order to improve the sealing effect, the positioning platform 1121 and the box wall 1111 of the box body 111 are transitionally matched, for example, H8 / f7 matching can be adopted to ensure that the box cover 112 will not loosen during the sealing installation. The end edge of the positioning platform 1121 is provided with a chamfer of 15°~20°, so that the positioning platform 1121 can be conveniently extended into the inner cavity of the box body 111 when the box cover 112 is installed.

[0056] The hydrogen concentration sensor 191 is sealed and installed on the box cover 112 to detect the average hydrogen concentration in the upper part of the inner cavity of the box body 111. The hydrogen concentration sensor 191 can be located in the inner cavity of the box body 111 and connected to the box cover 112. A through hole is provided on the box cover 112 for the wiring harness of the hydrogen concentration sensor 191 to pass through. In some embodiments, the hydrogen concentration sensor 191 can also be located in the inner cavity of the box body 111 with only the probe part. Figure 4 A through hole 1122 is provided on the box cover 112, the probe of the hydrogen concentration sensor 191 is located in the inner cavity of the box body 111, and the main body thereof extends outward through the through hole 1122. A sealing groove 1123 is provided on the periphery of the positioning platform 1121 close to the through hole 1122, and the probe is squeezed and placed on the sealing ring in the sealing groove 1123 and is locked on the positioning platform 1121 by screws.

[0057] The joint unit 113 can be sealed and connected to the box body 111 by gluing, welding, threading, etc.; the joint unit 113 and the box body 111 can also be set as an integrated structure, such as Figure 2 As shown, the joint unit 113 and the box body 111 are integrally formed to achieve a sealed connection. The specific connection method between the joint unit 113 and the box body 111 is not limited in this application.

[0058] Considering that the two ends of the joint unit 113 are respectively connected to the test pipeline 120 and the hydrogen pipe 10 to be tested, and the interface sizes of hydrogen pipes of different materials may be different, in order to adapt to hydrogen pipes of different types and diameters, please refer to Figure 3 In some embodiments, the joint unit 113 includes a sealingly connected connecting pipe 1131 and a joint pipe 1132, the connecting pipe 1131 is connected to the test pipeline 120, and the hydrogen pipe 10 to be tested is sealed and sleeved on the joint pipe 1132. One of the connecting pipe 1131 and the joint pipe 1132 can be fixedly connected to the box body 111 or integrally formed, so as to achieve the installation and fixation of the hydrogen pipe 10 to be tested.

[0059] See also Figure 3In some embodiments, both ends of the connecting pipe 1131 and the first end of the joint pipe 1132 are provided with a chuck 1133, and the chuck 1133 of the connecting pipe 1131 and the chuck 1133 of the joint pipe 1132 clamp the sealing gasket 1134 together and lock it through a sealing buckle 1135. The connecting pipe 1131 and the box body 111 are integrally formed. In some embodiments, the connecting pipe 1131 and the test pipeline 120 can be connected in the same manner as above, that is, the connecting pipe 1131 and the test pipeline 120 are connected through the chuck 1133, the sealing gasket 1134 is clamped, and the sealing buckle 1135 is locked. The sealing buckle 1135 has a buckle groove. When in use, the sealing buckle 1135 is buckled on the two butted chucks 1133. The width of the buckle groove is less than the total thickness of the two chucks 1133 and the sealing gasket 1134 therebetween, so that after the sealing buckle 1135 is installed, the two chucks 1133 are driven to clamp the sealing gasket 1134, thereby achieving the sealing of the joint unit 113 itself and the sealing between the joint unit 113 and the test pipeline 120. The sealing buckle 1135 is simpler to disassemble and assemble than threaded fasteners. The second end of the joint pipe 1132 is a pipe section, and its outer diameter is not less than the inner diameter of the hydrogen pipe 10 to be tested. The hydrogen pipe 10 to be tested is sleeved on the second end of the joint pipe 1132 and locked by the clamp 20 to achieve the sealing between the joint unit 113 and the hydrogen pipe 10 to be tested.

[0060] The hydrogen supply module 130 is used to provide hydrogen to the test loop 101 and assist the circulating power element 170 in adjusting the pressure of the hydrogen in the test loop 101. The hydrogen supply module 130 can be an independently arranged hydrogen bottle; it can also be a pipe joint for docking with an external hydrogen bottle; it can also be a hydrogen generating device, such as electrolyzing water to generate hydrogen. The specific structure of the hydrogen supply module 130 is not limited in this application.

[0061] See also Figure 1 In some embodiments, the hydrogen supply module 130 includes a hydrogen storage device 131 and a hydrogen injector 132, which are connected to the test line 120 through a pipeline, and the hydrogen storage device 131 is equipped with a bottle valve module, which can realize the functions of pressure reduction and flow adjustment, and the hydrogen injector 132 is used to inject hydrogen into the test loop 101. In some embodiments, the hydrogen injector 132 can also be replaced by an ejector, so as to eject the hydrogen seeping from the hydrogen permeation collection device 110 into the test loop 101.

[0062] The exhaust module 140 is used to extract the gas in the test circuit 101. Before the test begins, the gas in the test circuit 101 should be first extracted through the exhaust module 140 to ensure that after the hydrogen supply module 130 supplies gas and the circulating power element 170 is not turned on, the test circuit 101 can be automatically filled with the pressure of hydrogen, and only hydrogen is ensured in the test circuit 101, thereby improving the accuracy of the test. The exhaust module 140 can be an independently arranged vacuum pumping device; or it can be a pipe joint for docking with an external vacuum pumping device. The specific structure of the exhaust module 140 is not limited in this application.

[0063] See also Figure 1 In some embodiments, the air extraction module 140 includes a vacuum pump 141 and an air extraction switch valve 142, which are connected to the test pipeline 120 through a pipeline. Before the test starts, the air extraction switch valve 142 is first opened to keep the vacuum pump 141 and the test pipeline 120 unobstructed, and then the vacuum pump 141 is turned on to extract the air in the test pipeline 120, thereby forming a negative pressure inside the test pipeline 120.

[0064] The humidification module 150 is used to humidify the hydrogen in the test loop 101 to simulate the humidity at the anode inlet end of the stack of the fuel cell system. Inside the stack, hydrogen and oxygen generate water on the cathode side (air field side) through electrochemical reactions. The water enters the anode side (hydrogen field side) through the proton exchange membrane and is discharged from the stack along with the unreacted hydrogen. Although the hydrogen subsystem is provided with a water vapor separator to separate water and hydrogen, it is difficult to completely separate water vapor and hydrogen. The unseparated water vapor is ejected into the anode inlet end of the stack by the hydrogen pump and ejector of the hydrogen subsystem, so that the hydrogen entering the stack has a certain humidity. The humidification module 150 can be an independently arranged humidifier, such as a membrane humidifier used in the air subsystem of the fuel cell system; it can also be a pipe joint for docking with an external humidification device. The specific structure of the humidification module 150 is not limited in this application.

[0065] See also Figure 1 In some embodiments, the humidification module 150 includes an injection device 151 and a humidification switch valve 152, and the injection device 151 and the humidification switch valve 152 are connected through a pipeline and connected to the test pipeline 120. The hydrogen should reach a set humidity before circulating in the test loop 101, that is, after the hydrogen supply module 130 supplies gas and the circulating power element 170 is not turned on, the humidification switch valve 152 is first opened to keep the injection device 151 and the test pipeline 120 unobstructed, and then the injection device 151 is turned on to inject water into the test pipeline 120 so that the hydrogen has a certain humidity. In order to better simulate the humidity of the anode air inlet end of the fuel cell stack, the injection device 151 injects water in the form of spray.

[0066] The temperature regulating module 160 is used to adjust the temperature of the hydrogen in the test loop 101, simulating the temperature of the anode inlet end of the stack of the fuel cell system. The temperature regulating module 160 has the functions of heating and heat dissipation, so as to adjust the temperature of the hydrogen entering the hydrogen pipe 10 to be tested to a fixed temperature range. In certain embodiments, considering that the humidification module 150 and the temperature regulating module 160 mainly adjust the characteristics of the hydrogen entering the hydrogen pipe 10 to be tested, the connection between the humidification module 150 and the temperature regulating module 160 and the test loop 101 should be closer to the inlet end of the hydrogen pipe 10 to be tested than the connection between the hydrogen supply module 130 and the exhaust module 140 and the test loop 101. The temperature regulating module 160 can adopt any temperature regulating component disclosed in the prior art, and the specific structure is not limited in this application.

[0067] See also Figure 1 In some embodiments, the temperature adjustment module 160 includes a heat exchange device 161, a heating element 162, a circulating water pump 163 and a radiator assembly 164 connected by a pipeline. The heat exchange device 161 exchanges heat with the test pipeline 120. The heat exchange device 161 can be a heat exchange plate, a heat exchange tube, etc., which is not limited in this application. The heating element 162 can be a PTC or a heating wire, etc., which is not limited in this application. The radiator assembly 164 can adopt water cooling, air cooling, oil cooling and other heat dissipation methods, which is not limited in this application.

[0068] The circulation power element 170 is used to drive the hydrogen to circulate in the test loop 101. The circulation power element 170 can be a hydrogen pump of a fuel cell system or other power element that drives gas circulation, and this application does not limit this. Figure 1 In some embodiments, the circulating power element 170 is a hydrogen circulation pump, which is connected to the test pipeline 120 and is located between the temperature adjustment module 160 and the hydrogen permeation collection device 110. Since the hydrogen circulation pump adopts a compression work driving mode, the compression work process will cause the hydrogen temperature to rise. In addition, the hydrogen circulation pump is also close to the air inlet end of the hydrogen pipe 10 to be tested. Therefore, the hydrogen circulation pump can assist the temperature adjustment module 160 to jointly adjust the temperature of the hydrogen entering the hydrogen pipe 10 to be tested.

[0069] By adjusting the power of the circulating power element 170, the pressure of the hydrogen entering the hydrogen pipe 10 to be tested can be changed to a certain extent. In order to more conveniently adjust the hydrogen pressure, please refer to Figure 1 In some embodiments, the hydrogen pipe permeation test system 100 further includes a throttle 180, which is connected to the test pipeline 120 and is located between the hydrogen permeation collection device 110 and the circulation power element 170. By adjusting the opening of the throttle 180, the flow rate of hydrogen can be changed, thereby more quickly adjusting the pressure of hydrogen entering the hydrogen pipe 10 under test.

[0070] During the test, the temperature and pressure of the hydrogen entering the hydrogen pipe 10 to be tested are maintained within the set range. To obtain the temperature and pressure of the hydrogen, please refer to Figure 1 In some embodiments, the hydrogen pipe permeation test system 100 further includes a plurality of sensors. Specifically, the sensors include: a first temperature sensor 192 disposed in the test pipeline 120 and located between the hydrogen permeation collection device 110 and the throttle 180, for detecting the temperature of the hydrogen at the inlet end of the hydrogen pipe 10 to be tested; a second temperature sensor 193 disposed in the test pipeline 120 and located upstream of the temperature adjustment module 160, for detecting the temperature of the hydrogen before the temperature adjustment of the temperature adjustment module 160, which reflects the temperature of the hydrogen at the outlet end of the hydrogen pipe 10 to be tested; a first pressure sensor 194 disposed in the test pipeline 120 and located between the hydrogen permeation collection device 110 and the throttle 180, for detecting the pressure of the hydrogen at the inlet end of the hydrogen pipe 10 to be tested; and a second pressure sensor 195 disposed in the test pipeline 120 and located between the circulating power element 170 and the temperature adjustment module 160, for detecting the pressure of the hydrogen upstream of the circulating power element 170, which reflects the pressure of the hydrogen at the outlet end of the hydrogen pipe 10 to be tested.

[0071] In other embodiments, the hydrogen pipe permeation test system 100 may further include a humidity sensor, which is disposed in the test pipeline 120 and located downstream of the humidification module 150, and may be located specifically between the hydrogen permeation collection device 110 and the temperature adjustment module 160, to detect the humidity of the hydrogen before the temperature adjustment of the temperature adjustment module 160. The above-mentioned sensors of the hydrogen pipe permeation test system 100 may have their own display meters, and the test personnel may read the readings directly from the display meters; the above-mentioned sensors may also be connected to a controller, and the controller reads the detection signals and displays the readings.

[0072] In a second aspect of the present application, a hydrogen pipe permeation test method is provided. The test method is implemented based on the hydrogen pipe permeation test system 100 of any embodiment of the first aspect. Figure 1 , the test method comprises the following steps:

[0073] S1 . Install the hydrogen pipe 10 to be tested in the hydrogen permeation collection device 110 and connect it to the test pipeline 120 to form a test loop 101 .

[0074] Please combine Figure 2 , Figure 3 and Figure 4In some embodiments, the two ends of the hydrogen pipe 10 to be tested are respectively sleeved on the ends of the two joint units 113 located in the inner cavity of the box 111, and are locked by the clamp 20 to ensure sealing. The hydrogen concentration sensor 191 is sealed and installed on the box cover 112, and at least the probe part of the hydrogen concentration sensor 191 is located in the inner cavity of the box 111, and then the box cover 112 is sealed and connected to the box 111. The end of the joint unit 113 located outside the box 111 is connected to the test pipeline 120, so that the test pipeline 120, the hydrogen pipe 10 to be tested and the two joint units 113 together form a complete test loop 101.

[0075] S2. Extracting the gas in the test loop 101 through the gas extraction module 140 .

[0076] Please combine Figure 1 In some embodiments, the vacuum switch valve 142 and the vacuum pump 141 are opened in sequence, and the air in the test loop 101 is extracted by the vacuum pump 141, so that the entire device loop forms a negative pressure close to vacuum, and then the vacuum switch valve 142 and the vacuum pump 141 are closed.

[0077] S3, hydrogen is provided to the test loop 101 through the hydrogen supply module 130, and the hydrogen in the test loop 101 is humidified through the humidification module 150. Step S3 mainly provides hydrogen with a certain humidity to the test loop 101, and hydrogen supply and humidification can be performed simultaneously or successively, which is not limited in this application.

[0078] Please combine Figure 1 In some embodiments, the humidification switch valve 152 is opened, and liquid water of a set mass m (unit g) is injected into the test pipeline 120 through the injection device 151. In order to keep close to the actual working conditions of the fuel cell stack, the mass m of water to be supplemented is calculated according to the relative humidity φi of the pipeline gas, the temperature Ti (unit ℃), the pressure Pi (unit bar (a)) and the volume U (unit L) of the entire test loop 101. Considering that the water at the anode outlet of the fuel cell stack is acidic, the water injected by the humidification module 150 is acidic water, and its pH value is 3.5~6, for example, the pH value is 3.8, 4, 4.2, 4.5, 4.7, 5.3, 5.5, 5.8, etc. After the injection is completed, the humidification switch valve 152 is closed.

[0079] Please combine Figure 1 In some embodiments, the hydrogen storage device 131 and the hydrogen injector 132 are turned on, and hydrogen is injected into the test pipeline 120 according to the amount of hydrogen required by the fuel cell stack operating condition simulated by the current test. When the set amount of hydrogen is reached, the hydrogen storage device 131 and the hydrogen injector 132 are turned off. The amount of hydrogen injected can be determined by the flow meter of the hydrogen storage device 131 itself, or by the indication of the first pressure sensor 194.

[0080] S4. Control the circulation power element 170 and the temperature adjustment module 160 to operate so that the hydrogen flows in the test loop 101 and the hydrogen at the inlet end of the hydrogen pipe 10 to be tested reaches the set pressure and the set temperature.

[0081] In order to truly simulate the actual working conditions of the fuel cell stack, in some embodiments, the set pressure and set temperature are respectively the pressure and humidity of the hydrogen entering the fuel cell stack under the same working conditions. The set pressure and set temperature can be a certain point value or an interval range, which is not limited in this application. For example, the pressure of the hydrogen entering the stack of a fuel cell system under the minimum output condition is 125±2KPa, and the temperature is 65±5℃; the pressure of the hydrogen entering the stack under the medium output power condition (the output power is 50% of the rated power, such as the case where the vehicle is heavily loaded or rapid overtaking is achieved through instantaneous acceleration) is 200±2KPa, and the temperature is 70±5℃; the pressure of the hydrogen entering the stack under the rated power condition is 250±2KPa, and the temperature is 75±5℃. If the current test simulates the situation where the fuel cell stack is in the rated power condition, the set pressure is 250±2KPa and the set temperature is 75±5℃.

[0082] Figure 1 In the hydrogen pipe permeation test system 100 of the illustrated embodiment, the temperature adjustment module 160 includes a heat exchange device 161, a heating element 162, a circulating water pump 163 and a radiator assembly 164 connected by a pipeline, and a throttle 180 is connected between the hydrogen permeation collection device 110 and the circulating power element 170. The corresponding step S4 specifically includes the following steps:

[0083] S41, control the heating element 162 and the circulating water pump 163 to operate, and heat the water temperature in the heat exchange device 161 to the set temperature. At this time, since the circulating power element 170 has not been turned on, the hydrogen has not started to circulate, the heat exchange between the test pipeline 120 and the heat exchange device 161 is small, and the water temperature in the heat exchange device 161 can rise quickly.

[0084] After the water temperature in the heat exchange device 161 is heated to the set temperature, the heating power of the heating element 162 is reduced, and the circulating water pump 163 continues to operate, so that the water temperature in the heat exchange device 161 is maintained at the set temperature.

[0085] S42 , controlling the operation of the circulating power element 170 , adjusting the opening of the throttle valve 180 until the pressure of the hydrogen at the inlet end of the hydrogen pipe 10 to be measured reaches the set pressure, and fixing the opening of the throttle valve 180 .

[0086] S5. Maintaining the set pressure and the set temperature, detecting the hydrogen concentration inside the hydrogen permeation collection device 110 through the hydrogen concentration sensor 191, and obtaining the hydrogen permeation characteristics of the hydrogen pipe 10 under test according to the hydrogen concentration.

[0087] S51. In step S42, since the gas temperature will rise during the compression work of the circulating power element 170, the heating element 162 needs to be turned off after the hydrogen pressure reaches the set pressure. If the hydrogen temperature exceeds the upper limit of the set temperature at this time, the radiator assembly 164 needs to be turned on to continuously cool the hydrogen in the test loop 101 so that the temperature of the hydrogen at the inlet end of the tested hydrogen pipe 10 is maintained at the set temperature. When the detection value of the first temperature sensor 192 is greater than the upper limit of the set temperature, the speed of the fan of the radiator assembly 164 needs to be increased to accelerate the cooling.

[0088] In step S42, the pressure of the hydrogen at the inlet end of the hydrogen pipe 10 under test has reached the set pressure, and the hydrogen pipe 10 under test will begin to leak hydrogen. Therefore, the moment when the pressure of the hydrogen at the inlet end of the hydrogen pipe 10 under test reaches the set pressure is recorded as zero, and timing is started. At the same time, the hydrogen concentration inside the hydrogen permeation collection device 110 detected by the hydrogen concentration sensor 191 is recorded, and the hydrogen permeation curve of the hydrogen pipe 10 under test of the material under the fuel cell working condition simulated by the current test process can be obtained, thereby obtaining the hydrogen permeation characteristics of the hydrogen pipe 10 under test. After the timing starts, until the end of the test, it is necessary to ensure that the temperature of the hydrogen at the inlet end of the hydrogen pipe 10 under test is always maintained at the set temperature and the pressure is always maintained at the set pressure.

[0089] As hydrogen permeates the hydrogen pipe 10 under test, the hydrogen in the test loop 101 gradually decreases, and the detection pressures of the first pressure sensor 194 and the second pressure sensor 195 also gradually decrease. At this time, it is necessary to increase the rotation speed of the circulating power element 170 to ensure that the pressure of the hydrogen at the inlet end of the hydrogen pipe 10 under test is maintained at the set pressure, that is, the reading of the first pressure sensor 194 is within the interval corresponding to the set pressure.

[0090] As the hydrogen permeated into the hydrogen pipe 10 increases over time, the rotation speed of the circulating power element 170 also increases gradually. The temperature rise caused by the compression work of the circulating power element 170 also increases gradually. Therefore, it is necessary to continuously increase the rotation speed of the fan of the radiator assembly 164 to accelerate the cooling.

[0091] When the circulating power element 170 has reached the maximum speed, but the pressure of the hydrogen at the inlet end of the hydrogen pipe 10 to be tested is still less than the set pressure, that is, the reading of the first pressure sensor 194 is always less than the lower limit of the set pressure, hydrogen is added to the test loop 101 through the hydrogen supply module 130. During the process of adding hydrogen, it is necessary to reduce the speed of the circulating power element 170 at the same time to ensure that the pressure of the hydrogen at the inlet end of the hydrogen pipe 10 to be tested is maintained at the set pressure. In some embodiments, the amount of hydrogen added is: when the speed of the circulating power element 170 is reduced to the same speed as the hydrogen pump of the fuel cell system under the stack working condition simulated by the current test process, the pressure of the hydrogen at the inlet end of the hydrogen pipe is maintained at the amount of hydrogen required for the set pressure.

[0092] In other embodiments, step S4 and step S5 may also first control the operation of the circulating power element 170, adjust the opening of the throttle 180, until the pressure of the hydrogen at the inlet end of the hydrogen pipe 10 to be tested reaches the set pressure, and fix the opening of the throttle 180. Since the compression work process of the circulating power element 170 will cause the gas to heat up, plus the ambient temperature of the environment in which the test process is located, after the pressure of the hydrogen reaches the set pressure, the temperature of the hydrogen at the inlet end of the hydrogen pipe 10 to be tested may have reached the set temperature, then at this time, only the radiator assembly 164 and the circulating water pump 163 need to be turned on, and the heating element 162 may not work, and the radiator assembly 164 continuously cools down the hydrogen in the test loop 101 to maintain the temperature of the hydrogen at the inlet end of the hydrogen pipe 10 to be tested at the set temperature. If, after the hydrogen pressure reaches the set pressure, the temperature of the hydrogen at the inlet end of the hydrogen pipe 10 is much lower than the lower limit of the set temperature, in order to quickly heat up the hydrogen, the heating element 162 and the circulating water pump 163 can be turned on first to quickly heat the water in the heat exchange device 161 to the set temperature, and then the heating element 162 can be turned off.

[0093] In the above-mentioned hydrogen pipe permeation test method, step S3, step S4 and step S5 can be performed multiple times. That is to say, taking the pressure and humidity of the hydrogen entering the stack of the fuel cell system under other working conditions as the new set pressure and set temperature, repeating the above-mentioned steps S3, step S4 and step S5, the hydrogen permeation characteristics of the hydrogen pipe 10 under different working conditions can be obtained. Therefore, the hydrogen pipe permeation test method of the embodiment of the present application, by making the hydrogen with the same pressure, temperature and humidity as the actual application working condition flow inside the hydrogen pipe 10 under test, using the hydrogen permeation collection device 110 to collect and test the amount of hydrogen permeated through the pipeline sample, thereby judging the permeation characteristics of different material hoses to hydrogen. The hydrogen pipe permeation test method not only takes into account static working conditions, but also takes into account dynamic use scenarios, including both high-pressure permeation tests and low-pressure permeation tests. It can comprehensively evaluate the impact of pipelines on hydrogen utilization and hydrogen safety, and guide the selection of the most suitable pipeline materials.

[0094] Application examples:

[0095] The pressure of hydrogen entering the stack of a fuel cell system under minimum output conditions is 125±2KPa, and the temperature is 65±5℃; the pressure of hydrogen entering the stack under medium output power conditions (output power is 50% of rated power, such as when the vehicle is heavily loaded or accelerates instantaneously to overtake quickly) is 200±2KPa, and the temperature is 70±5℃; the pressure of hydrogen entering the stack under rated power conditions is 250±2KPa, and the temperature is 75±5℃. The alternative materials for the hydrogen pipe used in this fuel cell system are silicone and fluororubber, so a total of six tests are required, specifically, hydrogen permeation characteristics tests for silicone hydrogen pipes under minimum output conditions, medium output power conditions, and rated power conditions, and hydrogen permeation characteristics tests for fluororubber hydrogen pipes under minimum output conditions, medium output power conditions, and rated power conditions.

[0096] Taking the hydrogen permeation characteristic test of the silicone hydrogen tube under the minimum output condition as an example, the steps of the corresponding hydrogen tube permeation test method are as follows:

[0097] S1 . Install the hydrogen pipe 10 to be tested in the hydrogen permeation collection device 110 and connect it to the test pipeline 120 to form a test loop 101 .

[0098] S2. Open the exhaust switch valve 142 and the vacuum pump 141 in sequence, and use the vacuum pump 141 to extract the air in the test loop 101, so that the entire device loop forms a negative pressure close to vacuum, and then close the exhaust switch valve 142 and the vacuum pump 141.

[0099] S3, open the humidification switch valve 152, and inject a set mass of liquid water into the test pipeline 120 through the injection device 151. The water injected by the humidification module 150 is acidic water with a pH value of 4. After the injection is completed, close the humidification switch valve 152.

[0100] S4, opening the hydrogen storage device 131 and the hydrogen injector 132, injecting hydrogen in the same amount as that required under the minimum output condition of the fuel cell stack into the test pipeline 120, and then closing the hydrogen storage device 131 and the hydrogen injector 132.

[0101] S5, control the operation of the heating element 162 and the circulating water pump 163, quickly heat the water in the heat exchange device 161 to 65°C, reduce the heating power of the heating element 162, and continue to operate the circulating water pump 163.

[0102] S6, control the circulation power element 170 to start and run at idle speed, at this time, the pressure increase detected by the first pressure sensor 194 is about 2KPa, adjust the opening of the throttle 180 until the pressure of the hydrogen at the inlet end of the hydrogen pipe 10 to be tested, that is, the detection pressure of the first pressure sensor 194 reaches 125±2KPa, and fix the opening of the throttle 180. Since the compression and work process of the circulation power element 170 will cause the gas to heat up, the heating element 162 needs to be turned off after the pressure of the hydrogen reaches 125 KPa.

[0103] S7. When the detection value of the second temperature sensor 193 exceeds 67°C, turn on the radiator assembly 164 to continuously cool down the hydrogen in the test loop 101 so that the detection value of the first temperature sensor 192 is maintained at 65±5°C. If the detection value of the first temperature sensor 192 exceeds 67°C, it means that the current cooling effect of the radiator assembly 164 is weak, and it is necessary to increase the speed of the fan of the radiator assembly 164 to speed up the cooling. At the same time, the speed of the circulating power element 170 is adjusted according to the difference between the detection values ​​of the first pressure sensor 194 and the second pressure sensor 195, so that the detection pressure of the first pressure sensor 194 is maintained at 125±2KPa.

[0104] S8. The moment when the pressure of the hydrogen at the inlet end of the hydrogen tube 10 reaches the set pressure is recorded as zero, and the timing is started. At the same time, the hydrogen concentration inside the hydrogen permeation collection device 110 detected by the hydrogen concentration sensor 191 is recorded, and the hydrogen permeation curve of the silicone hydrogen tube under the minimum output condition of the stack can be obtained. After one hour of timing, the current test is ended, and the hydrogen permeation characteristics of the silicone hydrogen tube under the minimum output condition of the stack within one hour are obtained. During this hour, it is necessary to ensure that the detection value of the first temperature sensor 192 is maintained at 65±5℃ and the detection pressure of the first pressure sensor 194 is maintained at 125±2KPa.

[0105] During this hour, the hydrogen permeated into the tested hydrogen pipe 10 gradually increases with time, and the rotation speed of the circulating power element 170 also gradually increases. When the circulating power element 170 has reached the maximum rotation speed, but the detection pressure of the first pressure sensor 194 is still less than 123KPa, the hydrogen injector 132 is turned on to replenish hydrogen into the test circuit 101, and the rotation speed of the circulating power element 170 is reduced to idle operation. When the circulating power element 170 is idling and the detection pressure of the first pressure sensor 194 is maintained at 125±2KPa, the hydrogen replenishment is stopped.

[0106] If the hydrogen permeation characteristics of the silicone hydrogen tube are to be tested under medium output power conditions, then after the first test, re-execute steps S3 to S8. The amount of hydrogen and the amount of supplementary water need to match the hydrogen and humidity required by the fuel cell stack at medium output power. The corresponding set pressure is adjusted to 200±2KPa, and the set temperature is adjusted to 70±5℃.

[0107] If the hydrogen permeation characteristics of the silicone hydrogen tube are to be tested under rated power conditions, after the first test, steps S3 to S8 are re-executed, and the amount of hydrogen and the amount of water added need to match the hydrogen and humidity required by the fuel cell stack at rated power, and the corresponding set pressure is adjusted to 250±2KPa, and the set temperature is adjusted to 75±5℃. For more detailed information, please refer to the above and will not be repeated here.

[0108] In the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0109] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise" and "counterclockwise" indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0110] It should be noted that all directional indications in the embodiments of the present application are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0111] In this application, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0112] In addition, the descriptions of "first", "second", etc. in this application are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0113] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine different embodiments or examples described in this specification.

[0114] In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the fact that they can be implemented by ordinary technicians in this field. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0115] Although the embodiments of the present application have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present application, and that the scope of the present application is defined by the claims and their equivalents.

Claims

1. A hydrogen pipe permeation test system, characterized in that: Used to test the hydrogen permeation characteristics of a soft rubber tube used to transport hydrogen in a fuel cell system, the hydrogen tube permeation test system includes: A hydrogen permeation collection device, used to install the hydrogen pipe to be measured, and equipped with a hydrogen concentration sensor; A test pipeline, connected to the hydrogen pipe to be tested, to form a test loop; A hydrogen supply module, connected to the test pipeline, for providing hydrogen to the test loop; An air extraction module, connected to the test pipeline, for extracting gas from the test circuit; A humidification module, connected to the test pipeline, used to humidify the hydrogen in the test loop; the water injected into the humidification module is acidic water; a temperature regulating module, which exchanges heat with the test pipeline and is used to regulate the temperature of the hydrogen in the test loop; and A circulation power element, connected to the test pipeline, for driving the hydrogen to circulate in the test loop; Among them, the hydrogen supply module assists the circulating power element in regulating the pressure of hydrogen in the test loop; the hydrogen supply module, the air extraction module, the humidification module, the temperature adjustment module and the circulating power element simulate the actual application conditions of the hydrogen pipe under test in the test loop, and hydrogen with the same pressure, temperature and humidity as those in the actual application conditions flows inside the test loop.

2. The hydrogen pipe permeation test system according to claim 1, characterized in that: The hydrogen permeation collection device comprises a box body, a box cover and a joint unit which are sealed and connected to the box body, one end of the joint unit is connected to the test pipeline, and the other end is connected to the hydrogen pipe to be tested; the hydrogen concentration sensor is sealed and installed on the box cover.

3. The hydrogen pipe permeation test system according to claim 2, characterized in that: The joint unit comprises a connecting pipe and a joint pipe which are sealed and connected. The connecting pipe is connected to the test pipeline, and the tested hydrogen pipe is sealed and sleeved on the joint pipe.

4. The hydrogen pipe permeation test system according to claim 3, characterized in that: Both ends of the connecting pipe and the first end of the joint pipe are provided with chucks, and the chucks of the connecting pipe and the chucks of the joint pipe clamp the sealing gasket together and are locked by a sealing buckle; the hydrogen pipe to be measured is sleeved on the second end of the joint pipe and locked by a clamp.

5. The hydrogen pipe permeation test system according to any one of claims 1 to 4, characterized in that: The temperature adjustment module includes a heat exchange device, a heating element, a circulating water pump and a radiator assembly connected by a pipeline, and the test pipeline exchanges heat with the heat exchange device; The hydrogen pipe permeation test system further includes a throttle valve connected to the test pipeline and located between the hydrogen permeation collection device and the circulation power element.

6. The hydrogen pipe permeation test system according to claim 5, characterized in that: The hydrogen pipe penetration test system also includes: A first temperature sensor is provided in the test pipeline and is located between the hydrogen permeation collection device and the throttle valve; A second temperature sensor, disposed in the test pipeline and located upstream of the temperature regulating module; A first pressure sensor, disposed in the test pipeline and located between the hydrogen permeation collection device and the throttle valve; The second pressure sensor is arranged in the test pipeline and located between the circulation power element and the temperature adjustment module.

7. A hydrogen pipe penetration test method implemented based on the hydrogen pipe penetration test system according to any one of claims 1 to 6, characterized in that: The steps include: The hydrogen pipe to be tested is installed in the hydrogen permeation collection device and connected with the test pipeline to form the test loop; Extracting the gas in the test circuit through the gas extraction module; Provide hydrogen to the test loop through the hydrogen supply module, and humidify the hydrogen in the test loop through the humidification module; Controlling the circulation power element and the temperature adjustment module to operate so that the hydrogen flows in the test loop and the hydrogen at the inlet end of the hydrogen pipe to be tested reaches a set pressure and a set temperature; The set pressure and the set temperature are maintained, the hydrogen concentration inside the hydrogen permeation collection device is detected by the hydrogen concentration sensor, and the hydrogen permeation characteristics of the hydrogen pipe under test are obtained according to the hydrogen concentration.

8. The hydrogen pipe permeation test method according to claim 7, characterized in that: In the case where the hydrogen pipe permeation test method is implemented based on the hydrogen pipe permeation test system according to claim 5 or 6, controlling the circulation power element and the temperature adjustment module to operate so that the hydrogen at the inlet end of the hydrogen pipe under test reaches a set pressure and a set temperature specifically includes: Controlling the operation of the heating element and the circulating water pump to heat the water temperature in the heat exchange device to the set temperature; The circulation power element is controlled to operate, and the opening of the throttle valve is adjusted until the pressure of the hydrogen at the inlet end of the hydrogen pipe to be tested reaches the set pressure.

9. The hydrogen pipe permeation test method according to claim 8, characterized in that: The maintaining of the set pressure and the set temperature specifically includes: Turning off the heating element and controlling the operation of the radiator assembly so that the temperature of the hydrogen at the inlet end of the hydrogen pipe to be tested is maintained at the set temperature; The rotation speed of the circulating power element is adjusted so that the pressure of the hydrogen at the inlet end of the hydrogen pipe to be tested maintains the set pressure; if the circulating power element reaches the maximum rotation speed and the pressure of the hydrogen at the inlet end of the hydrogen pipe to be tested is still less than the set pressure, hydrogen is supplemented into the test loop through the hydrogen supply module while the rotation speed of the circulating power element is reduced so that the pressure of the hydrogen at the inlet end of the hydrogen pipe to be tested maintains the set pressure.

10. The hydrogen pipe permeation test method according to claim 7, characterized in that: In the case where the hydrogen pipe permeation test method is implemented based on the hydrogen pipe permeation test system according to claim 5 or 6, the cycle power element and the temperature adjustment module are controlled to operate so that the hydrogen at the inlet end of the hydrogen pipe under test reaches a set pressure and a set temperature; Maintaining the set temperature; specifically comprising: Controlling the operation of the circulating power element and adjusting the opening of the throttle valve until the pressure of the hydrogen at the inlet end of the hydrogen pipe to be tested reaches the set pressure; The circulating water pump is controlled to operate, and the heating element and / or the radiator assembly is controlled to operate, so as to heat the water temperature in the heat exchange device to the set temperature and maintain it at the set temperature.

11. The hydrogen pipe permeation test method according to any one of claims 7 to 10, characterized in that: The set pressure and the set temperature are respectively the pressure and humidity of the hydrogen gas entering the stack of the fuel cell system under the same working conditions; The hydrogen pipe permeation test method also includes: using the pressure and humidity of the hydrogen entering the fuel cell stack of the fuel cell system under other working conditions as new set pressure and set temperature, repeating the above steps to obtain the hydrogen permeation characteristics of the hydrogen pipe under the current working conditions.

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