Test system and test method

Abstract

The present application specifically relates to a testing system and a testing method. The testing system is applied to a fuel cell. The testing system includes: a stack module, the stack module includes an input port and an output port, the output port is connected to the inlet of a first gas-liquid separator; a hydrogen supply module, the hydrogen supply module is connected to the input port in the stack module, the first outlet of the first gas-liquid separator is connected to the hydrogen supply module via a circulation pipe, and the circulation pipe is provided with a first solenoid valve; a testing module, the testing module includes a gas-liquid separation unit and a gas testing unit, the gas-liquid separation unit is connected to the second outlet of the first gas-liquid separator via a drainage pipe, the drainage pipe is provided with a drain valve, the gas testing unit is connected to the third outlet of the first gas-liquid separator via a hydrogen drainage pipe, the hydrogen drainage pipe is provided with a hydrogen drainage valve, and the gas testing unit is also connected to the gas-liquid separation unit. This solution can accurately obtain the separation efficiency of the first gas-liquid separator and the water content entering the hydrogen supply module.

Description

Technical Field

[0001] The present application belongs to the field of fuel cell technology, and specifically relates to a testing system and a testing method. Background Art

[0002] A hydrogen fuel cell is a power generation device that uses hydrogen and oxygen from the air as fuel and is widely used in vehicles. The gas supply system for a hydrogen fuel cell is divided into a hydrogen system and an air system. Currently, fuel cells typically utilize a hydrogen circulation system, recycling unreacted hydrogen from the fuel cell anode through a hydrogen circulation pump or ejector. Before the unreacted hydrogen from the fuel cell anode is introduced into the hydrogen circulation pump, it must pass through a gas-liquid separator to separate the liquid contained in the hydrogen from the hydrogen. Therefore, the gas-liquid separation performance of the gas-liquid separator directly affects the performance and proper operation of the fuel cell.

[0003] However, currently available gas-liquid separators lack unified performance evaluation indicators and better testing methods, making it difficult to judge the quality of gas-liquid separators and, consequently, to determine the water content entering the anode of a fuel cell. Summary of the Invention

[0004] The purpose of this application is to provide a testing system and testing method that can accurately judge the quality of a gas-liquid separator and determine the water content entering a fuel cell anode stack.

[0005] In a first aspect, the present application provides a test system, which is applied to a fuel cell and includes:

[0006] A stack module, the stack module comprising an input port and an output port, the output port being in communication with an inlet of the first gas-liquid separator;

[0007] a hydrogen supply module, the hydrogen supply module being connected to the input port of the fuel cell module, the first outlet of the first gas-liquid separator being connected to the hydrogen supply module via a circulation pipe, and the circulation pipe being provided with a first solenoid valve;

[0008] A test module, the test module includes a gas-liquid separation unit and a gas testing unit, the gas-liquid separation unit is connected to the second outlet of the first gas-liquid separator through a liquid discharge pipe, and a drain valve is provided on the liquid discharge pipe, the gas testing unit is connected to the third outlet of the first gas-liquid separator through a hydrogen discharge pipe, and a hydrogen discharge valve is provided on the hydrogen discharge pipe, and the gas testing unit is connected to the gas-liquid separation unit.

[0009] In an exemplary embodiment of the present application, the gas-liquid separation unit includes:

[0010] a second gas-liquid separator, wherein the inlet of the second gas-liquid separator is connected to the second outlet of the first gas-liquid separator through the liquid drain pipe, the second gas-liquid separator comprises a hydrogen outlet and a liquid outlet, and the hydrogen outlet of the second gas-liquid separator is connected to the gas testing unit;

[0011] A liquid collector is connected to the liquid outlet of the second gas-liquid separator through a liquid infusion pipeline.

[0012] In an exemplary embodiment of the present application, the gas-liquid separation unit also includes a liquid level sensor and a weighing piece. The liquid level sensor can detect the liquid level of the liquid in the second gas-liquid separator. The weighing piece is arranged on one side of the liquid collector and can measure the weight of the liquid collector.

[0013] In an exemplary embodiment of the present application, the gas testing unit includes:

[0014] a first flow concentrator, the first flow concentrator being in communication with the third outlet of the first gas-liquid separator through the hydrogen exhaust pipe, and the first flow concentrator being in communication with the hydrogen outlet of the second gas-liquid separator;

[0015] A gas flow meter, wherein the inlet of the gas flow meter is connected to the outlet of the first flow combiner, and the gas flow meter can detect the gas flow in the first flow combiner.

[0016] In an exemplary embodiment of the present application, the gas testing unit further includes a dew point meter, which is provided at the outlet of the gas flow meter and can be used to detect the dew point temperature of the gas.

[0017] In an exemplary embodiment of the present application, the test module further includes a controller, which is electrically connected to the first solenoid valve, the weighing member, the gas flow meter, and the dew point meter respectively.

[0018] In an exemplary embodiment of the present application, a second solenoid valve is provided on the infusion pipeline, and the second solenoid valve and the liquid level sensor are both electrically connected to the controller, and the controller can control the opening and closing of the second solenoid valve according to the liquid level signal of the liquid level sensor.

[0019] In an exemplary embodiment of the present application, the hydrogen supply module includes a hydrogen circulation pump, a hydrogen supply source and a second manifold, the outlet of the hydrogen supply source is connected to the first inlet of the second manifold, the first outlet of the first gas-liquid separator is connected to the hydrogen circulation pump through the circulation pipe, and the hydrogen circulation pump is connected to the second inlet of the second manifold.

[0020] In an exemplary embodiment of the present application, the outer sides of the first gas-liquid separator, the second gas-liquid separator, the liquid collector, the weighing piece, the first flow collector, the gas flow meter, the dew point meter, the circulation pipe, the liquid discharge pipe, the hydrogen discharge pipe, the liquid infusion line, the hydrogen circulation pump, the hydrogen supply source and the second flow collector are all wrapped with insulation parts or heating parts.

[0021] In an exemplary embodiment of the present application, both the first gas-liquid separator and the second gas-liquid separator include a baffle structure.

[0022] A second aspect of the present application provides a testing method based on any of the above-mentioned testing systems, the testing method comprising the following steps:

[0023] Opening the first solenoid valve, and obtaining the water content M1 flowing into the gas-liquid separation unit and the gas testing unit under preset stack operating conditions and within a preset time period;

[0024] Close the first solenoid valve, and under the same preset stack operating conditions, ensure that the parameters of the stack module are consistent with those of the stack module when the first solenoid valve is opened, keep the state of the stack module consistent with the state of the stack module when the first solenoid valve is opened, and obtain the water content M2 flowing into the gas-liquid separation unit and the gas testing unit within the same preset time period;

[0025] Calculate the water content M entering the fuel cell module through the hydrogen supply module 循 , M 循 =M2-M1; calculate the separation efficiency η of the first gas-liquid separator, η=M1 / M2.

[0026] In another exemplary embodiment of the present application, a test method for obtaining a water content M1 flowing into the gas-liquid separation unit and the gas testing unit, or obtaining a water content M2 flowing into the gas-liquid separation unit and the gas testing unit, includes the following steps:

[0027] During the preset time period, the weight M of the liquid collector is measured. 收 , the flow rate W of the gas flow meter, the gas dew point temperature Td of the dew point meter and the water volume fraction h% at the dew point temperature to calculate the water content .

[0028] This application has the following beneficial effects:

[0029] The present application provides a test system; wherein, when the first solenoid valve between the first gas-liquid separator and the hydrogen supply module is opened, the water content M1 passing through the hydrogen discharge valve and the water drain valve is measured, and then under the same conditions, the first solenoid valve is closed, and the water content M2 passing through the hydrogen discharge valve and the water drain valve is measured; since the first solenoid valve is connected to the first gas-liquid separator and the hydrogen supply module, when the first solenoid valve is opened, part of the hydrogen and part of the water in the gas-liquid mixture discharged from the stack module flow back into the stack module through the hydrogen supply module, and the water content M1 measured at this time does not include the water content re-entering the stack module; when the first solenoid valve is closed, the hydrogen and water in the stack module completely flow into the test module through the first gas-liquid separator, and the water content M2 measured at this time is the total water content output by the stack module. By measuring the water content M1 and the water content M2, the water content re-entering the fuel cell stack module can be accurately obtained, that is, by subtracting the water content M1 from the water content M2, the water content Mcirculation re-entering the fuel cell stack module can be obtained, and the separation efficiency of the first gas-liquid separator can also be accurately obtained through the water content M1 and the water content M2.

[0030] Other features and advantages of the present application will become apparent from the following detailed description, or may be learned in part by practice of the present application.

[0031] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The accompanying drawings are incorporated into and constitute a part of the specification, illustrate embodiments consistent with the present application, and together with the specification, are used to explain the principles of the present application. Obviously, the drawings described below are only some embodiments of the present application, and those skilled in the art can derive other drawings based on these drawings without inventive effort.

[0033] Figure 1 Shows a structural block diagram of the test system provided in Example 1 or Example 2 of the present application;

[0034] Figure 2 It shows a structural block diagram of the gas-liquid separation unit provided in Example 1 or Example 2 of the present application;

[0035] Figure 3 It shows a structural block diagram of the gas testing unit provided in the first or second embodiment of the present application;

[0036] Figure 4 A flow chart of the testing method provided in Example 2 of the present application is shown.

[0037] Description of reference numerals:

[0038] 1. Test system;

[0039] 10. Stack module; 11. Input port; 12. Output port;

[0040] 20. First gas-liquid separator;

[0041] 30. Hydrogen supply module; 31. Circulation pipeline; 32. First solenoid valve; 33. Hydrogen supply source; 34. Hydrogen circulation pump; 35. Second manifold;

[0042] 40. Test module; 41. Gas-liquid separation unit; 410. Drain pipe; 411. Drain valve; 412. Second gas-liquid separator; 413. Liquid collector; 414. Infusion pipeline; 415. Second solenoid valve; 416. Liquid level sensor; 417. Weight measuring piece; 42. Gas test unit; 420. Hydrogen discharge pipe; 421. Hydrogen discharge valve; 422. First manifold; 423. Gas flow meter; 424. Dew point meter; 43. Controller. DETAILED DESCRIPTION

[0043] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be implemented in many forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that this application will be thorough and complete and will fully convey the concepts of the example embodiments to those skilled in the art.

[0044] In this application, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of the technical features indicated. Therefore, a feature specified as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, "plurality" means two or more, unless otherwise specifically specified.

[0045] In this application, unless otherwise specified or limited, terms such as "assembly" and "connection" should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection; direct connection, or indirect connection through an intermediate medium; internal communication between two components, or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0046] In addition, described feature, structure or characteristic can be combined in one or more embodiments in any suitable manner.In the following description, many specific details are provided so as to provide a full understanding of the embodiments of the present application. However, it will be appreciated by those skilled in the art that the technical scheme of the present application can be put into practice without one or more of the specific details, or other methods, components, devices, steps etc. can be adopted. In other cases, known methods, devices, implementations or operations are not shown or described in detail to avoid blurring the various aspects of the application.

[0047] Example 1

[0048] The present application embodiment provides a test system 1, which is applied to a fuel cell, for example, a hydrogen fuel cell. Figures 1 to 3 As shown, this test system 1 includes:

[0049] The stack module 10 includes an input port 11, an output port 12, and an anode portion. The anode portion is used to simulate the anode of a fuel cell stack. The input port 11 is connected to the anode portion for inputting fresh hydrogen or re-introducing hydrogen into the anode portion; the output port 12 is connected to the anode portion, and the anode portion can output a gas-liquid mixture to the output port 12, and input the gas-liquid mixture to the inlet of the first gas-liquid separator 20, that is, the output port 12 is connected to the inlet of the first gas-liquid separator 20 to perform gas-liquid separation on the gas-liquid mixture;

[0050] A hydrogen supply module 30 is used to simulate hydrogen supply and hydrogen circulation at the anode of a fuel cell stack. The hydrogen supply module 30 is connected to the input port 11 of the stack module 10. The first outlet of the first gas-liquid separator 20 is connected to the hydrogen supply module 30 through a circulation pipe 31. A first solenoid valve 32 is provided on the circulation pipe 31. The hydrogen supply module 30 generates dry-wet mixed hydrogen and inputs it into the anode part of the stack module 10.

[0051] Testing module 40 includes a gas-liquid separation unit 41 and a gas testing unit 42. The gas-liquid separation unit 41 is connected to the second outlet of the first gas-liquid separator 20 via a liquid drain pipe 410. A drain valve 411 is provided on the drain pipe 410, which controls the flow of the liquid drain pipe 410. The gas testing unit 42 is connected to the third outlet of the first gas-liquid separator 20 via a hydrogen drain pipe 420. A hydrogen drain valve 421 is provided on the hydrogen drain pipe 420, which controls the flow of the hydrogen drain pipe 420. The gas testing unit 42 is also connected to the gas-liquid separation unit 41. This testing module 40 is used to obtain the water content of the liquid flowing into the testing module 40.

[0052] The present application solution measures the water content M1 in the test module 40 when the first solenoid valve 32 is open and the water content M2 in the test module 40 when the first solenoid valve 32 is closed, respectively, through the test module 40. This can obtain the water content Mcirculation = M2-M1 in the gas-liquid mixture at the anode outlet of the fuel cell stack that circulates in the hydrogen supply module 30, i.e., the water content that re-enters the fuel cell anode stack after passing through the first gas-liquid separator 20. Furthermore, the separation efficiency η of the first gas-liquid separator 20 can be obtained, η = M1 / M2, which can accurately calculate the separation efficiency of the first gas-liquid separator 20, accurately evaluate the quality of the first gas-liquid separator 20, and formulate a drainage strategy that is more in line with actual conditions based on this separation efficiency.

[0053] The following is a detailed description of this application system:

[0054] The anode part in the stack module 10 is the stack anode of the fuel cell under actual application, which can release gaseous hydrogen, gaseous water and liquid water with a certain pressure and temperature, and input the gaseous hydrogen, gaseous water and liquid water into the first gas-liquid separator 20 through the output port 12. The first gas-liquid separator 20 separates the gaseous hydrogen, gaseous water and liquid water.

[0055] See also Figure 1 As shown, the hydrogen supply module 30 includes a hydrogen supply source 33, a hydrogen circulation pump 34 and a second manifold 35. The hydrogen supply source 33 is a high-pressure hydrogen source, which is connected to the second manifold 35 through a hydrogen supply pipeline. The hydrogen circulation pump 34 is connected to the first gas-liquid separator 20 through a circulation pipe 31. A first solenoid valve 32 is provided on the circulation pipe 31. The first solenoid valve 32 can control the on and off of this circulation pipe 31. The hydrogen circulation pump 34 is connected to the second manifold 35 through a hydrogen supply branch. The outlet of the second manifold 35 is connected to the input port 11 of the fuel cell module 10, that is, the outlet of the second manifold 35 is connected to the anode part; that is, the hydrogen of the hydrogen supply source 33 and the hydrogen in the first gas-liquid separator 20 are collected through the second manifold 35 and then introduced into the anode part together.

[0056] It can be understood that the hydrogen in the hydrogen circulation pump 34 and the hydrogen supply source 33 can be brought to the same pressure and temperature through the second manifold 35 before being introduced into the anode part, thereby avoiding the direct introduction of the hydrogen in the hydrogen circulation pump 34 and the hydrogen supply source 33 into the anode part, resulting in different pressures and temperatures between the two, which affects the normal working state of the fuel cell.

[0057] See also Figure 1 and Figure 2As shown, the gas-liquid separation unit 41 includes a second gas-liquid separator 412 and a liquid collector 413. The inlet of the second gas-liquid separator 412 is connected to the second outlet of the first gas-liquid separator 20 through a drainage pipe 410. A drain valve 411 is provided on the drainage pipe 410, which can control the on and off of the drainage pipe 410; when the drain valve 411 is opened, it can be used to receive liquid water separated from the first gas-liquid separator 20.

[0058] It is understandable that since the first gas-liquid separator 20 may not separate completely, the liquid water entering the second gas-liquid separator 412 may be mixed with gaseous hydrogen. Therefore, the second gas-liquid separator 412 is used to separate the liquid water flowing into the first gas-liquid separator 20 through the drainage pipe 410.

[0059] Among them, this second gas-liquid separator 412 includes a hydrogen outlet and a liquid outlet. After separation by the second gas-liquid separator 412, the gaseous hydrogen flows out from the hydrogen outlet and flows into the gas testing unit 42; the liquid water flows out through the liquid outlet and is transferred to the liquid collector 413 through the infusion pipeline 414 for storage. The infusion pipeline 414 is provided with a second solenoid valve 415, which can control its opening and closing according to the liquid level sensor 416 described below, thereby controlling the on-off of this infusion pipeline 414.

[0060] For further information, see Figure 1 and Figure 2 As shown, the gas-liquid separation unit 41 further includes a liquid level sensor 416 and a weight measuring element 417. The liquid level sensor 416 is provided on the second gas-liquid separator 412 and is used to detect changes in the liquid level in the second gas-liquid separator 412. When the liquid level detected by the liquid level sensor 416 reaches a set upper limit, the second solenoid valve 415 is opened to discharge the liquid in the second gas-liquid separator 412 into the liquid collector 413 through the liquid infusion line 414. When the liquid level detected by the liquid level sensor 416 reaches a set lower limit, the second solenoid valve 415 is closed to prevent hydrogen in the second gas-liquid separator 412 from flowing into the liquid collector 413. The weighing piece 417 is arranged below the liquid collector 413 and is used to measure the weight of the liquid collector 413. It should be understood that when obtaining the weight of the liquid in the liquid collector 413, it is necessary to obtain the weight of the liquid collector 413 itself in advance, and then subtract the weight of the liquid collector 413 itself from the weight obtained by the weighing piece 417 to obtain the weight of the liquid in the liquid collector 413.

[0061] It should be noted that the set upper limit value does not affect the water and gas separation space in the second gas-liquid separator 412; the set lower limit value is not lower than the liquid outlet of the second gas-liquid separator 412 to avoid gas discharge.

[0062] In addition, in order to avoid the presence of gas in the liquid collector 413, a ventilation pipeline is provided above the liquid collector 413 to discharge the gas in the liquid collector 413 to avoid affecting the liquid weight measured by the weighing piece 417.

[0063] For further information, see Figure 1 and Figure 3 As shown, the gas testing unit 42 includes a first manifold 422 and a gas flowmeter 423. The first manifold 422 is connected to the third outlet of the first gas-liquid separator 20 via a hydrogen discharge pipe 420. The hydrogen discharge pipe 420 is provided with a hydrogen discharge valve 421, which controls the opening and closing of the hydrogen discharge pipe 420. The first manifold 422 is also connected to the hydrogen outlet of the second gas-liquid separator 412 via a hydrogen pipeline to discharge hydrogen from the second gas-liquid separator 412 into the first manifold 422. In other words, the first manifold 422 can receive hydrogen from the first gas-liquid separator 20 and the second gas-liquid separator 412, allowing the hydrogen from the two gas-liquid separators to mix in the first manifold 422. After the hydrogen from the two gas-liquid separators is mixed to a stable state, the first manifold 422 can pass the hydrogen inside the manifold into the gas flowmeter 423 to calculate the hydrogen flow rate.

[0064] For further information, see Figure 1 and Figure 3 As shown, the gas testing unit 42 also includes a dew point meter 424, which is arranged at the outlet of the gas flow meter 423. The dew point meter 424 can detect the dew point temperature of the gas and obtain the water volume fraction at this dew point temperature according to the dew point temperature and water content comparison table.

[0065] In addition, the hydrogen passing through the gas flow meter 423 will be discharged into the hydrogen collection box for recycling.

[0066] It is worth mentioning that, in the examples of this application, see Figure 1 As shown, the test module 40 further includes a controller 43 , which is electrically connected to the first solenoid valve 32 , the second solenoid valve 415 , the liquid level sensor 416 , the gas flow meter 423 and the dew point meter 424 , respectively.

[0067] Among them, the controller 43 can control whether the hydrogen after gas-liquid separation circulates into the anode part through the hydrogen circulation pump 34 by controlling the opening and closing of the first solenoid valve 32; when the first solenoid valve 32 is opened, the hydrogen separated by the gas-liquid mixture through the first gas-liquid separator 20 circulates into the anode part through the hydrogen circulation pump 34, that is, the hydrogen discharged from the anode part is recycled and the hydrogen is re-introduced into the stack; when the first solenoid valve 32 is closed, the gas-liquid mixture discharged from the anode part is separated by the first gas-liquid separator 20, and water and gas all flow into the test module 40.

[0068] In addition, the controller 43 controls the opening and closing of the second solenoid valve 415 through the liquid level information transmitted by the liquid level sensor 416. When the liquid level detected by the liquid level sensor 416 reaches the set upper limit value, the second solenoid valve 415 is opened to discharge the liquid in the second gas-liquid separator 412 into the liquid collector 413 through the infusion pipeline 414; when the liquid level detected by the liquid level sensor 416 reaches the set lower limit value, the second solenoid valve 415 is closed to prevent the hydrogen in the second gas-liquid separator 412 from flowing into the liquid collector 413.

[0069] The dew point meter 424 measures the dew point temperature of the gas, and the controller 43 can obtain the water volume fraction at the dew point temperature based on the dew point temperature.

[0070] It is worth mentioning that the controller 43 can obtain data such as current, voltage, power, single chip average voltage, single chip minimum voltage, and single chip maximum voltage in the stack module 10 .

[0071] In the embodiment of the present application, both the first gas-liquid separator 20 and the second gas-liquid separator 412 include a baffle structure, that is, both the first gas-liquid separator 20 and the second gas-liquid separator 412 are baffle-type separation structures.

[0072] In an embodiment of the present application, the pipeline connecting the fuel cell module 10 and the first gas-liquid separator 20, the first gas-liquid separator 20, the pipeline connecting the first gas-liquid separator 20 and the second gas-liquid separator 412, the pipeline connecting the first gas-liquid separator 20 and the first manifold 422, the second gas-liquid separator 412, the first manifold 422, the pipeline connecting the second gas-liquid separator 412 and the liquid collector 413, the liquid collector 413, the pipeline connecting the first manifold 422 and the gas flow meter 423, the gas flow meter 423, the pipeline output by the gas flow meter 423, the dew point meter 424, the pipeline connecting the first gas-liquid separator 20 and the hydrogen circulation pump 34, the hydrogen circulation pump 34, and the pipeline connecting the hydrogen circulation pump 34 and the second manifold 35 are all wrapped with insulation or heating elements to prevent condensation due to the decrease in gas temperature as the gas flows, thereby ensuring the accuracy of the test.

[0073] It should be noted that the insulation component may be insulation cotton, and the heating component may be a hot water / hot air pipeline, which provides heating for the above pipelines.

[0074] In order to test the separation effect of the first gas-liquid separator 20, the present application may specifically conduct the test in the following process:

[0075] The first solenoid valve 32 is opened, and under preset stack operating conditions and within a preset time period, the water content M1 flowing into the gas-liquid separation unit 41 and the gas testing unit 42 is obtained.

[0076] It can be understood that because the first solenoid valve 32 between the first gas-liquid separator 20 and the hydrogen circulation pump 34 is open, the gas-liquid mixture flowing out of the anode portion passes through the first gas-liquid separator 20, and the drain valve 411 and hydrogen discharge valve 421 are opened and closed at a preset frequency. A portion of the hydrogen and gaseous water enter the second flow combiner 35 along with the hydrogen circulation pump 34, while the remaining portion enters the gas testing unit 42 and the gas-liquid separation unit 41 through the hydrogen discharge valve 421 and the drain valve 411, respectively. In other words, the obtained water content M1 is less than the water content in the gas-liquid mixture leaving the stack from the anode portion.

[0077] Opening and closing drain valve 411 and hydrogen discharge valve 421 at a preset frequency means that the opening and closing of hydrogen discharge valve 421 are spaced apart within a certain time period, and the opening and closing of drain valve 411 are spaced apart within a certain time period. For example, hydrogen discharge valve 421 and drain valve 411 are open within a preset time period T1, and closed within a preset time period T2. The frequencies of drain valve 411 and hydrogen discharge valve 421 can be the same or different.

[0078] Close the first solenoid valve 32 between the first gas-liquid separator 20 and the hydrogen circulation pump 34, and under the same preset stack operating conditions, ensure that the parameters of the stack module 10 are consistent with the parameters of the stack module 10 when the first solenoid valve 32 is opened, so that the state of the stack module 10 is consistent with the state of the stack module 10 when the first solenoid valve 32 is opened, and within the same preset time period, obtain the water content M2 flowing into the gas-liquid separation unit 41 and the gas testing unit 42.

[0079] That is, the parameters and state of the stack module 10 in this step are the same as those in the previous step, so as to ensure the accuracy of the test. It should be noted that the parameters of the stack module 10 include the inlet pressure and gas stoichiometric ratio in the stack module 10. In other words, it is necessary to keep the state of the stack module 10 in this step consistent with that in the previous step to ensure that the water content of the gas-liquid mixture output from the output port 12 of the stack module 10 is the same, thereby ensuring the accuracy of the measurement.

[0080] In addition, when the first solenoid valve 32 is closed, the drain valve 411 and the hydrogen discharge valve 421 are opened and closed at the same preset frequency as above. Opening and closing the drain valve 411 and the hydrogen discharge valve 421 at the preset frequency is the same as described above and will not be repeated here.

[0081] It should be understood that the processes of measuring the water content M1 and the water content M2 are independent of each other and do not interfere with each other, that is, there is no order of precedence for the water content M1 and the water content M2 measured by the two, but the environment, working state, working parameters and state of the fuel cell module 10 of the two are the same.

[0082] In addition, since the first solenoid valve 32 between the first gas-liquid separator 20 and the hydrogen circulation pump 34 is closed, the gas-liquid mixture flowing out of the stack module 10 passes through the first gas-liquid separator 20 and then completely enters the gas testing unit 42 and the gas-liquid separation unit 41 through the hydrogen discharge valve 421 and the water discharge valve 411, respectively. In other words, the obtained water content M2 is equal to the water content in the gas-liquid mixture output from the output port 12 of the stack module 10.

[0083] The method of obtaining the water content M1 and the water content M2 includes: measuring the weight M of the liquid collector 413 within a preset time period. 收 , the flow rate W of the gas flow meter 423, the gas dew point temperature Td of the dew point meter 424 and the water volume fraction h% at the dew point temperature to calculate the water content , to obtain water content M1 and water content M2.

[0084] After obtaining the water content M1 and the water content M2, the water content M in the hydrogen gas flowing back into the anode part through the hydrogen circulation pump 34 can be known. 循 , M 循 =M2-M1; and the separation efficiency η of the first gas-liquid separator 20 can be calculated, η=M1 / M2.

[0085] Through this test system 1, the present application can completely and accurately obtain the separation efficiency of the first gas-liquid separator 20 and the water content flowing back into the anode part through the hydrogen circulation pump 34; that is, without changing the structure of the fuel cell system, the anode water volume and destination are quantitatively tested, and the separation efficiency of the first gas-liquid separator 20 and the actual water tolerance of the fuel cell stack are tested in a real usage scenario. The test results can be used to assist in formulating a drainage strategy that is more in line with actual conditions.

[0086] Example 2

[0087] The second embodiment of the present application provides a testing method based on the testing system 1 in the first embodiment, see Figures 1 to 4 As shown, this test method includes the following steps:

[0088] Step S100 , opening the first solenoid valve 32 , obtaining the water content M1 flowing into the gas-liquid separation unit 41 and the gas testing unit 42 under preset stack operating conditions and within a preset time period.

[0089] Because the first solenoid valve 32 between the first gas-liquid separator 20 and the hydrogen circulation pump 34 is open, the gas-liquid mixture flowing out of the anode portion passes through the first gas-liquid separator 20. The drain valve 411 and hydrogen discharge valve 421 are opened and closed at a preset frequency. A portion of the hydrogen and gaseous water flows through the hydrogen circulation pump 34 into the second flow combiner 35, while the remainder passes through the hydrogen discharge valve 421 and drain valve 411 into the gas testing unit 42 and gas-liquid separation unit 41, respectively. This results in a water content M1 that is lower than the water content in the gas-liquid mixture exiting the stack from the anode portion.

[0090] Opening and closing drain valve 411 and hydrogen discharge valve 421 at a preset frequency means that the opening and closing of hydrogen discharge valve 421 are spaced apart within a certain time period, and the opening and closing of drain valve 411 are spaced apart within a certain time period. For example, hydrogen discharge valve 421 and drain valve 411 are open within a preset time period T1, and closed within a preset time period T2. The frequencies of drain valve 411 and hydrogen discharge valve 421 can be the same or different.

[0091] Step S200, close the first solenoid valve 32, and under the same preset stack operating conditions, ensure that the parameters of the stack module 10 are consistent with the parameters of the stack module 10 when the first solenoid valve 32 is opened, so that the state of the stack module 10 is consistent with the state of the stack module 10 when the first solenoid valve 32 is opened, and obtain the water content M2 flowing into the gas-liquid separation unit 41 and the gas testing unit 42 within the same preset time period.

[0092] That is, the parameters and state of the stack module 10 in step S200 are the same as the parameters and state of the stack module 10 in step S100, so as to ensure the accuracy of the test.

[0093] It should be noted that the parameters of the stack module 10 include the inlet pressure and gas stoichiometric ratio of the stack module 10. In other words, the state of the stack module 10 in this step needs to be kept consistent with the state of the stack module 10 in the previous step to ensure that the water content output from the output port 12 of the stack module 10 is the same, thereby ensuring measurement accuracy.

[0094] In addition, when the first solenoid valve 32 is closed, the drain valve 411 and the hydrogen discharge valve 421 are opened and closed at the same preset frequency as above. Opening and closing the drain valve 411 and the hydrogen discharge valve 421 at the preset frequency is the same as described above and will not be repeated here.

[0095] It is understood that since the first solenoid valve 32 between the first gas-liquid separator 20 and the hydrogen circulation pump 34 is closed, the gas-liquid mixture flowing out of the stack module 10 passes through the first gas-liquid separator 20 and then completely enters the gas testing unit 42 and the gas-liquid separation unit 41 through the hydrogen discharge valve 421 and the water discharge valve 411, respectively. In other words, the obtained water content M2 is equal to the water content in the gas-liquid mixture output from the output port 12 of the stack module 10.

[0096] In addition, the processes of measuring the water content M1 and the water content M2 are independent of each other and do not interfere with each other, that is, there is no order of precedence for the water content M1 and the water content M2 measured by the two, but the environment, working state, working parameters, and stack anode state of the two are the same.

[0097] During the preset time period, the weight M of the liquid collector 413 is measured. 收 , the flow rate W of the gas flow meter 423, the gas dew point temperature Td of the dew point meter 424 and the water volume fraction h% at the dew point temperature to calculate the water content .

[0098] That is, the water content M1 and the water content M2 are obtained by measuring the weight M of the liquid collector 413 within a preset time period. 收 , the flow rate W of the gas flow meter 423, the gas dew point temperature Td of the dew point meter 424 and the water volume fraction h% at the dew point temperature to calculate the water content , to obtain water content M1 and water content M2.

[0099] After obtaining the water content M1 and the water content M2, the water content M in the hydrogen gas flowing into the anode part through the hydrogen circulation pump 34 can be known. 循 and the separation efficiency of the first gas-liquid separator 20.

[0100] Step S300, calculate the water content M entering the fuel cell module 10 through the hydrogen supply module 30 循 , M 循 =M2-M1; calculate the separation efficiency η of the first gas-liquid separator 20, η=M1 / M2.

[0101] The present application can completely and accurately obtain the separation efficiency of the first gas-liquid separator 20 and the water content flowing back into the anode part through the hydrogen circulation pump 34 through this test system 1 and test method; that is, without changing the structure of the fuel cell system, the anode water volume and destination are quantitatively tested, and the separation efficiency of the first gas-liquid separator 20 and the actual water tolerance of the fuel cell stack are tested in a real usage scenario. The test results can be used to assist in formulating a drainage strategy that is more in line with actual conditions.

[0102] In the description of this specification, the reference terms "some embodiments", "exemplarily", etc. mean 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 can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and features of different embodiments or examples without contradiction.

[0103] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application. Therefore, any changes or modifications made in accordance with the claims and description of the present application should fall within the scope of the patent application.

Claims

1. A test system, which is applied to a fuel cell, characterized in that: The test system comprises: A stack module, the stack module comprising an input port, an output port, and an anode portion, the input port and the output port being in communication with the anode portion, and the output port being in communication with an inlet of a first gas-liquid separator; a hydrogen supply module, the hydrogen supply module being connected to the input port of the fuel cell module, the first outlet of the first gas-liquid separator being connected to the hydrogen supply module via a circulation pipe, and the circulation pipe being provided with a first solenoid valve; The test module includes a gas-liquid separation unit and a gas testing unit, the gas-liquid separation unit is connected to the second outlet of the first gas-liquid separator through a drainage pipe, the drainage pipe is provided with a drain valve, the gas testing unit is connected to the third outlet of the first gas-liquid separator through a hydrogen discharge pipe, the hydrogen discharge pipe is provided with a hydrogen discharge valve, and the gas testing unit is connected to the gas-liquid separation unit; the gas-liquid separation unit includes a second gas-liquid separator and a liquid collector, the inlet of the second gas-liquid separator is connected to the second outlet of the first gas-liquid separator through the drainage pipe, and the second The gas-liquid separator includes a hydrogen outlet and a liquid outlet, and the hydrogen outlet of the second gas-liquid separator is connected to the gas testing unit; the liquid collector is connected to the liquid outlet of the second gas-liquid separator through an infusion pipeline; the gas testing unit includes a first manifold and a gas flow meter, the first manifold is connected to the third outlet of the first gas-liquid separator through the hydrogen exhaust pipe, and the first manifold is connected to the hydrogen outlet of the second gas-liquid separator; the inlet of the gas flow meter is connected to the outlet of the first manifold, and the gas flow meter is used to detect the gas flow in the first manifold.

2. The test system according to claim 1, wherein: The gas-liquid separation unit further includes a liquid level sensor and a weighing piece. The liquid level sensor can detect the liquid level of the liquid in the second gas-liquid separator. The weighing piece is arranged on one side of the liquid collector and can measure the weight of the liquid collector.

3. The test system according to claim 2, wherein: The gas testing unit further includes a dew point meter, which is arranged at the outlet of the gas flow meter and is used to detect the dew point temperature of the gas.

4. The test system according to claim 3, characterized in that: The test module further includes a controller, which is electrically connected to the first solenoid valve, the weighing member, the gas flow meter, and the dew point meter respectively.

5. The test system according to claim 4, characterized in that: A second solenoid valve is provided on the liquid infusion pipeline. The second solenoid valve and the liquid level sensor are both electrically connected to the controller. The controller can control the opening and closing of the second solenoid valve according to the liquid level signal of the liquid level sensor.

6. The test system according to claim 5, characterized in that: The hydrogen supply module includes a hydrogen circulation pump, a hydrogen supply source and a second manifold. The outlet of the hydrogen supply source is connected to the first inlet of the second manifold. The first outlet of the first gas-liquid separator is connected to the hydrogen circulation pump through the circulation pipeline. The hydrogen circulation pump is connected to the second inlet of the second manifold.

7. The test system according to claim 6, characterized in that: The outsides of the first gas-liquid separator, the second gas-liquid separator, the liquid collector, the weight measuring piece, the first flow collector, the gas flow meter, the dew point meter, the circulation pipeline, the liquid discharge pipeline, the hydrogen discharge pipeline, the liquid infusion pipeline, the hydrogen circulation pump, the hydrogen supply source and the second flow collector are all wrapped with insulation or heating elements.

8. The test system according to any one of claims 2 to 7, characterized in that: The first gas-liquid separator and the second gas-liquid separator both include a baffle structure.

9. A testing method based on the testing system according to any one of claims 1 to 8, characterized in that: The testing method comprises the following steps: Opening the first solenoid valve, under preset stack operating conditions and within a preset time period, obtaining the water content M1 flowing into the gas-liquid separation unit and the gas testing unit; Close the first solenoid valve, and under the same preset stack operating conditions, ensure that the parameters of the stack module are consistent with those of the stack module when the first solenoid valve is opened, keep the state of the stack module consistent with the state of the stack module when the first solenoid valve is opened, and obtain the water content M2 flowing into the gas-liquid separation unit and the gas testing unit within the same preset time period; Calculate the water content M entering the fuel cell module through the hydrogen supply module 循 , M 循 =M2-M1; calculate the separation efficiency η of the first gas-liquid separator, η=M1 / M2.

10. The testing method according to claim 9, characterized in that: The test method for obtaining the water content M1 flowing into the gas-liquid separation unit and the gas testing unit, or obtaining the water content M2 flowing into the gas-liquid separation unit and the gas testing unit comprises the following steps: During the preset time period, the weight M of the liquid collector is measured. 收 , the flow rate W of the gas flow meter, the gas dew point temperature Td of the dew point meter and the water volume fraction h% at the dew point temperature to calculate the water content .

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