System and method for testing hydrogen supply flow of hydrogen fuel cell

Abstract

The invention relates to the technical field of hydrogen fuel cells, and discloses a hydrogen fuel cell hydrogen supply flow test system, which simulates the pile inlet pressure during the operation of a new energy automobile hydrogen supply system through the configuration of a back pressure adjusting container and pressure release valves, and calculates the hydrogen supply flow of a new energy automobile by selecting one or more pressure release valves and setting the pressure release pressure threshold change mode of the pressure release valves. Dynamic changes of inlet pressure of fuel cell stacks of different brands and different types are simulated, and hydrogen supply flow and inlet and outlet pressure values of a hydrogen pressure reducer are obtained, so that relation analysis among the inlet pressure of a target stack to be tested, the hydrogen supply flow and the hydrogen pressure reducer is carried out. According to the scheme, a brand-new testing thought is provided, the voltage stabilization state of the inlet voltage of the rear-end simulation galvanic pile is taken as a starting point, the inlet pressure of the galvanic pile is simulated by ingeniously utilizing the configuration of the back pressure adjusting container and the pressure release valve, and the optimal hydrogen supply flow matched with voltage stabilization is researched by taking the voltage stabilization state as a control point; and data support is provided for accurate control of supply flow in subsequent practical application.

Description

Technical Field

[0001] The present invention relates to the technical field of hydrogen fuel cells, and in particular to a hydrogen supply flow rate testing system and method for a hydrogen fuel cell. Background Art

[0002] Hydrogen fuel cells are efficient and environmentally friendly energy conversion devices that convert hydrogen and oxygen directly into electrical energy through electrochemical reactions. Their only byproduct is water, which is usually discharged in the form of water vapor. Therefore, they have the advantages of zero emissions, high efficiency and low noise, and have broad application prospects in transportation, power supply, portable power sources and other fields.

[0003] In particular, with the development of electric vehicles, hydrogen fuel cell vehicles have made great breakthroughs, and various hydrogen fuel cell vehicles have also entered commercial production and operation. In the hydrogen fuel cell systems carried by these vehicles, the stable output of hydrogen supply flow and pressure is an important part of ensuring the efficient and stable operation of the fuel cell system. Therefore, it is very important to conduct relevant verification tests on the hydrogen supply of the fuel cell.

[0004] The conventional testing method is to use fuel cells for testing. This method can ensure the authenticity and reliability of the test, because the changes in hydrogen flow and pressure under actual operating conditions can be directly reflected in the performance of the fuel cell. However, this test is costly, consumes fuel cells, and has a long test cycle, so it is not suitable for frequent testing. Summary of the invention

[0005] The present invention aims to provide a hydrogen fuel cell hydrogen supply flow testing system and method, constructing a system that simulates the dynamic changes in the fuel cell stack inlet pressure, and can test the relationship analysis among the dynamically changing stack inlet pressure, hydrogen supply flow, and hydrogen pressure reducer, thereby avoiding the use of fuel cells, which is of great significance for improving the performance and reliability of hydrogen fuel cell vehicles.

[0006] The basic scheme provided by the present invention is: a hydrogen fuel cell hydrogen supply flow rate test system, comprising an electrically connected control module, a data processing module and a test module;

[0007] The test module comprises a gas storage tank, a pipeline solenoid valve, a flow meter, a hydrogen pressure reducer and a back pressure regulating container which are sequentially connected along the air flow direction, wherein an inlet pressure sensor is installed at the inlet position of the hydrogen pressure reducer, an outlet pressure sensor is installed at the outlet position of the hydrogen pressure reducer, and the back pressure regulating container is connected to a plurality of parallel pressure relief pipelines, and each pressure relief pipeline is provided with a pressure-adjustable pressure relief valve;

[0008] The data processing module is used to collect the test module output data with timestamp in real time and send it to the control module, and is also used to aggregate the test module output data collected in real time for relationship analysis and processing; wherein the test module output data includes the flow and pressure data collected in real time by the flow meter, the inlet pressure sensor, and the outlet pressure sensor, respectively, and the real-time status information of the pressure relief valve;

[0009] The control module is used to control the action of the test module and adjust parameter settings, and is also used to interact with the data processing module to adjust the action of the test module; wherein controlling the action of the test module includes controlling the opening and closing of the pipeline solenoid valve and several pressure relief valves according to the control strategy; the parameters include the pressure relief pressure threshold of the pressure relief valve and its change mode, as well as the inlet pressure threshold and outlet pressure threshold of the hydrogen pressure reducer.

[0010] The present invention is based on a hydrogen fuel cell hydrogen supply flow rate testing system and also provides a hydrogen fuel cell hydrogen supply flow rate testing method, the method comprising the following steps:

[0011] S100, system preparation, setting test module parameters according to test requirements, wherein a pressure relief valve is selected according to a preset strategy based on the target stack inlet pressure value or range to be tested, and a change mode of the pressure relief pressure threshold of the pressure relief valve is set;

[0012] S200, start the test, the control module controls the pipeline solenoid valve to open, the pressure relief valve to close, the gas flows out of the gas storage tank, passes through the flow meter, the inlet pressure sensor, the hydrogen pressure reducer, the outlet pressure sensor, and enters the back pressure regulating container. The gas pressure in the back pressure regulating container gradually increases;

[0013] S300, system adjustment, based on the change mode, on the basis of the dynamic change of the pressure relief pressure threshold of the pressure relief valve, when the gas pressure in the back pressure regulating container reaches the pressure relief pressure threshold of a pressure relief valve, the pressure relief valve is opened, and the other pressure relief valves are closed, and the gas is discharged from the corresponding pressure relief pipeline of the pressure relief valve; until the inlet pressure of the hydrogen pressure reducer reaches the set minimum inlet pressure, the control module controls the pipeline solenoid valve to close, and this test ends;

[0014] S400, test module output data acquisition, after the gas is introduced until the inlet pressure of the hydrogen pressure reducer reaches the set minimum inlet pressure, the flow meter, the inlet pressure sensor and the outlet pressure sensor respectively collect the flow and pressure data in real time, and the pressure relief valve transmits the status information to the data processing module, and the data processing module receives the output data of the test module and sends it to the control module;

[0015] S500, data processing, the data processing module performs data processing based on the test module output data that carries a timestamp and is data-marked at the time of the pressure relief valve actuation, and obtains relationship analysis information, wherein the relationship analysis includes the relationship between the target stack inlet pressure, hydrogen flow rate, and the hydrogen pressure reducer inlet pressure and outlet pressure;

[0016] S600, conduct the next test, repeat this test for secondary test verification, or replace the hydrogen pressure reducer, change the target stack inlet pressure value or range to be tested, and conduct a new test when the gas in the gas tank meets the requirements.

[0017] The working principle and advantages of the present invention are as follows: by configuring a back pressure regulating container and a pressure relief valve, the inlet pressure of the fuel cell stack when the hydrogen supply system of a new energy vehicle is running is simulated; by selecting one or more pressure relief valves and setting the change mode of the pressure relief pressure threshold of the pressure relief valve, the dynamic change of the inlet pressure of fuel cell stacks of different brands and types is simulated; the hydrogen supply flow rate and the inlet and outlet pressure values ​​of the hydrogen pressure reducer are obtained during the process from ventilation to the time when the inlet pressure of the hydrogen pressure reducer reaches the set minimum inlet pressure; and the relationship among the inlet pressure of the target fuel cell stack to be tested, the hydrogen supply flow rate and the hydrogen pressure reducer are analyzed using the obtained data.

[0018] When the hydrogen supply system on a new energy vehicle is in operation, the inlet pressure of the hydrogen fuel cell stack changes dynamically, which is affected by many factors such as system start and stop, changes in power demand, hydrogen storage and supply, ambient temperature changes, and safety protection. Therefore, it is technically difficult to simulate the dynamically changing inlet pressure of the hydrogen fuel cell stack to test the hydrogen supply flow.

[0019] Compared with the existing technology, this solution breaks through the conventional way of using hydrogen fuel cells for testing to ensure authenticity, and proposes a new testing idea, which changes to the starting point of simulating the steady-state voltage of the stack inlet voltage at the back end, and cleverly uses the configuration of the back pressure regulating container and the pressure relief valve to simulate the dynamic change of the stack inlet pressure. With this as the control point, the optimal hydrogen supply flow rate that adapts to the dynamic change of the stack inlet pressure is studied, and data support is provided for the precise control of the supply flow rate in subsequent practical applications. Through the use of multi-stage parallel pressure relief pipelines and pressure relief valves, it is possible to simulate not only the operation of a single stack inlet voltage value, but also the dynamic change of the stack inlet voltage within a range. Through a single test, data under the dynamic change of the stack inlet voltage value can be obtained, which improves the test efficiency and system versatility, saves energy, and is economical and environmentally friendly.

[0020] On this basis, a more realistic application environment is provided for the performance evaluation of the hydrogen pressure reducer. The performance of the hydrogen pressure reducer can be analyzed based on the hydrogen supply flow rate and the inlet and outlet pressures of the hydrogen pressure reducer. The performance of the hydrogen pressure reducer can also be analyzed from another perspective from the stack inlet pressure and the inlet and outlet pressures of the hydrogen pressure reducer, thereby improving the evaluation dimension and accuracy of the performance of the hydrogen pressure reducer.

[0021] This solution makes full use of network connection technology, can run automatically and continuously, and is more intelligent. It can realize automatic or remote control, and no human supervision is required at the test site, and the safety of high-voltage testing is greatly guaranteed. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 A schematic diagram of the structure of a hydrogen fuel cell hydrogen supply flow rate test system provided by an embodiment of the present invention;

[0023] Figure 2 A schematic flow chart of a method for testing hydrogen supply flow of a hydrogen fuel cell provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0024] The following is a further detailed description through specific implementation methods:

[0025] The symbols in the drawings of the specification include: gas storage tank 1, pipeline solenoid valve 2, flow meter 3, inlet pressure sensor 4, outlet pressure sensor 5, hydrogen pressure reducer 6, back pressure regulating container 7, pressure relief valve 8, data processing module 9, control module 10.

[0026] Embodiment 1

[0027] Basically as attached Figure 1 As shown: A hydrogen fuel cell hydrogen supply flow test system, including an electrically connected control module, a data processing module and a test module;

[0028] The test module includes a gas storage tank, a pipeline solenoid valve, a flow meter, a hydrogen pressure reducer and a back pressure regulating container which are connected in sequence along the air flow direction, wherein an inlet pressure sensor is installed at the inlet position of the hydrogen pressure reducer, an outlet pressure sensor is installed at the outlet position of the hydrogen pressure reducer, the back pressure regulating container is connected to a multi-stage pressure relief pipeline, and a plurality of pressure-adjustable pressure relief valves are arranged at intervals on the multi-stage pressure relief pipeline.

[0029] Specifically, the gas tank is used to provide a test gas source to simulate the hydrogen supply in new energy vehicles. In this embodiment, the gas in the gas tank is high-pressure nitrogen with an initial pressure greater than 35MPa and less than 43.8MPa. The gas can be refilled when it is used up. Compared with hydrogen, nitrogen is more environmentally friendly and economical, and can be equivalent to hydrogen supply performance in the test.

[0030] The pipeline solenoid valve is a high-pressure solenoid valve with a pressure resistance of not less than 43.8MPa, and is used for the on and off of high-pressure test gas.

[0031] The flow meter is a mass flow meter with the advantages of fast response speed, good linearity, etc., and a pressure resistance of not less than 43.8MPa. The test range of the flow meter is greater than the maximum flow rate of the hydrogen pressure reducer to ensure effective flow data collection.

[0032] The inlet pressure of the hydrogen pressure reducer is not more than 43.8MPa. Different hydrogen pressure reducers can be replaced for testing in this system.

[0033] By configuring the back pressure regulating container and the pressure relief valve, the inlet pressure of the fuel cell stack when the vehicle's hydrogen supply system is in operation (i.e., the back pressure of the hydrogen supply system's pressure reducer) can be fully simulated. The tested flow and pressure can be kept consistent with the actual hydrogen supply changes of the vehicle's fuel cell stack. By adjusting the pressure relief pressure of the pressure relief valve, the inlet pressure of fuel cell stacks of different brands and types when the vehicle's hydrogen supply system is in operation can be fully simulated. The pressure relief pressure threshold of the pressure relief valve is not greater than the outlet pressure threshold of the hydrogen pressure reducer to ensure normal ventilation and data collection.

[0034] In this embodiment, three pressure relief pipelines are provided, and three pressure relief valves are provided correspondingly, namely the first pressure relief valve, the second pressure relief valve and the third pressure relief valve. In this scheme, the pressure relief pressure threshold of the pressure relief valve simulates the inlet pressure of the battery stack. In actual operation, the inlet pressure of the battery stack changes dynamically within a set range. The common inlet pressure range of the battery stack is 8-12bar. The inlet pressure requirements of common brands and types of battery stacks are 8-10bar and 10-12bar. Therefore, setting three pressure relief valves is conducive to combined application and better simulation of the change of the inlet pressure of the battery stack to meet the testing requirements of mainstream market batteries.

[0035] The data processing module is used to collect the test module output data carrying a timestamp in real time and send it to the control module, and is also used to aggregate the test module output data collected in real time for processing; the test module output data includes the flow and pressure data collected in real time by the flow meter, the inlet pressure sensor, and the outlet pressure sensor, respectively, as well as the real-time status information of the pressure relief valve.

[0036] Specifically, the addition of timestamp is conducive to building data relationship from the time dimension in combination with the dynamically changing stack inlet pressure; the data processing module is electrically connected to the flow meter, inlet pressure sensor, and outlet pressure sensor; the real-time status information of the pressure relief valve is whether the pressure relief valve is open or closed.

[0037] The control module is used to control the action and parameter setting of the test module, and is also used to interact with the data processing module to adjust the action of the test module; by using network connection technology, the test system can be automatically and continuously operated, making it more intelligent.

[0038] Specifically, the control test module action includes controlling the opening and closing of the pipeline solenoid valve and the pressure relief valve; the parameters include the pressure relief pressure threshold of the pressure relief valve and its change mode, as well as the inlet pressure threshold and outlet pressure threshold of the hydrogen pressure reducer.

[0039] like Figure 2 As shown, based on the above-mentioned hydrogen fuel cell hydrogen supply flow rate testing system, a hydrogen fuel cell hydrogen supply flow rate testing method is provided, and the method comprises the following steps:

[0040] S100, system preparation, setting test module parameters according to test requirements, wherein a pressure relief valve is selected according to a preset strategy based on the target stack inlet pressure value or range to be tested, and a change mode of the pressure relief pressure threshold of the pressure relief valve is set;

[0041] S200, start the test, the control module controls the pipeline solenoid valve to open, the pressure relief valve to close, the gas flows out of the gas storage tank, passes through the flow meter, the inlet pressure sensor, the hydrogen pressure reducer, the outlet pressure sensor, and enters the back pressure regulating container. The gas pressure in the back pressure regulating container gradually increases;

[0042] S300, system adjustment, based on the change mode, on the basis of the dynamic change of the pressure relief pressure threshold of the pressure relief valve, when the gas pressure in the back pressure regulating container reaches the pressure relief pressure threshold of a pressure relief valve, the pressure relief valve is opened, and the other pressure relief valves are closed, and the gas is discharged from the corresponding pressure relief pipeline of the pressure relief valve; until the inlet pressure of the hydrogen pressure reducer reaches the set minimum inlet pressure, the control module controls the pipeline solenoid valve to close, and this test ends;

[0043] S400, test module output data acquisition, after the gas is introduced until the inlet pressure of the hydrogen pressure reducer reaches the set minimum inlet pressure, the flow meter, the inlet pressure sensor and the outlet pressure sensor respectively collect the flow and pressure data in real time, and the pressure relief valve transmits the status information to the data processing module, and the data processing module receives the output data of the test module and sends it to the control module;

[0044] S500, data processing, the data processing module performs data processing based on the test module output data that carries a timestamp and is data-marked at the time of the pressure relief valve actuation, and obtains relationship analysis information, wherein the relationship analysis includes the relationship between the target stack inlet pressure, hydrogen flow rate, and the hydrogen pressure reducer inlet pressure and outlet pressure;

[0045] S600, conduct the next test, repeat this test for secondary test verification, or replace the hydrogen pressure reducer, change the target stack inlet pressure value or range to be tested, and conduct a new test when the gas in the gas tank meets the requirements.

[0046] In this embodiment, in S100, the hydrogen pressure reducer to be tested is selected as the NVH35 model product; the inlet pressure threshold is set to 3-35MPa, and the outlet pressure threshold is set to 8-20bar. In this embodiment, the outlet pressure threshold is set to 10±0.5bar.

[0047] In S100, the preset strategy is to select at least three pressure relief valves according to the target fuel cell stack inlet pressure range to be measured, and the pressure relief pressure thresholds of at least three pressure relief valves are changed in such a way that, within the target fuel cell stack inlet pressure range to be measured, the pressure relief pressure thresholds of at least three pressure relief valves are alternately increased in a preset manner; the pressure relief pressure thresholds of the unselected pressure relief valves are set to the maximum target fuel cell stack inlet pressure.

[0048] The pressure relief pressure thresholds of the pressure relief valves are increased alternately in a preset manner, whereby at least three selected pressure relief valves are numbered and arranged, and in a one-way cycle, the pressure relief pressure thresholds of the pressure relief valves are increased at intervals starting from the lowest pressure value of the target fuel cell stack inlet pressure range to be measured, until the pressure relief pressure threshold of a certain pressure relief valve reaches the highest pressure value of the target fuel cell stack inlet pressure range to be measured, and except for the pressure relief valve with the highest pressure value set, the pressure relief pressure thresholds of the other pressure relief valves whose pressure relief pressure thresholds have been changed for the last time are greater than the highest pressure value of the target fuel cell stack inlet pressure range to be measured.

[0049] In this embodiment, the optimal hydrogen supply flow rate is tested with a target stack inlet pressure value range to be tested, and the target stack inlet pressure value range to be tested is 9.5-10.5 bar. The first pressure relief valve, the second pressure relief valve and the third pressure relief valve are selected. In other embodiments, if there are more than three pressure relief valves, the pressure relief pressure thresholds of the other unselected pressure relief valves are all set to be greater than 10.5 bar, and 12 bar can be selected.

[0050] The initial value of the pressure relief pressure threshold of the first pressure relief valve is set to 9.5 bar, the initial value of the pressure relief pressure threshold of the second pressure relief valve is set to 9.7 bar, the initial value of the pressure relief pressure threshold of the third pressure relief valve is set to 9.9 bar, the first change value of the pressure relief pressure threshold of the first pressure relief valve is set to 10.1 bar, the first change value of the second pressure relief valve is set to 10.3 bar, and the target value of the change of the pressure relief pressure threshold of the third pressure relief valve is set to 10.5 bar.

[0051] In S200, the control module controls the pipeline solenoid valve to open, and the three pressure relief valves are all closed. The gas flows out from the gas storage tank, passes through the flow meter, the inlet pressure sensor, the hydrogen pressure reducer, the outlet pressure sensor in sequence, and enters the back pressure regulating container. The gas pressure in the back pressure regulating container gradually increases.

[0052] In S300, when the gas pressure in the back pressure regulating container reaches 9.5 bar, the first pressure relief valve opens, and the gas begins to be discharged from the pressure relief pipeline corresponding to the first pressure relief valve. After 2 seconds, the first pressure relief valve is closed and its pressure relief pressure threshold is adjusted to the first change value of 10.1 bar; when the gas pressure in the back pressure regulating container reaches 9.7 bar, the second pressure relief valve opens, and the gas begins to be discharged from the pressure relief pipeline corresponding to the second pressure relief valve. After 2 seconds, the second pressure relief valve is closed and its pressure relief pressure threshold is adjusted to the first change value of 10.3 bar; when the gas pressure in the back pressure regulating container reaches 9.9 bar, the third pressure relief valve opens, and the gas begins to be discharged from the pressure relief pipeline corresponding to the third pressure relief valve. After 2 seconds, the third pressure relief valve is closed and its pressure relief pressure threshold is adjusted to the first change value of 10.5 bar; when the back pressure regulating container reaches 9.9 bar, the third pressure relief valve opens, and the gas begins to be discharged from the pressure relief pipeline corresponding to the third pressure relief valve. After 2 seconds, the third pressure relief valve is closed and its pressure relief pressure threshold is adjusted to the first change value of 10.5 bar; When the gas pressure in the pressure regulating container reaches 10.1 bar, the first pressure relief valve opens again, and the gas begins to be discharged from the corresponding pressure relief pipeline of the first pressure relief valve. After 2 seconds, the first pressure relief valve is closed and its pressure relief pressure threshold is adjusted to the target value of 12 bar; when the gas pressure in the back pressure regulating container reaches 10.3 bar, the second pressure relief valve opens again, and the gas begins to be discharged from the corresponding pressure relief pipeline of the second pressure relief valve. After 2 seconds, the second pressure relief valve is closed and its pressure relief pressure threshold is adjusted to the target value of 12 bar; when the gas pressure in the back pressure regulating container reaches 10.5 bar, the third pressure relief valve opens again, and the gas begins to be discharged from the corresponding pressure relief pipeline of the third pressure relief valve, until the inlet pressure of the hydrogen pressure reducer reaches the set minimum inlet pressure, the pipeline solenoid valve and the pressure relief valve are shut off in safety mode to end the test. The 2s time interval is determined based on the frequency of dynamic changes in the inlet voltage of the conventional fuel cell stack. In fact, different change times can be set for the pressure relief pressure threshold of each pressure relief valve through the system of this solution to simulate different dynamic change modes.

[0053] During the process, when the test is to be terminated or the pressure in the gas tank 1 is too low to be tested normally, the control module 10 can automatically or remotely shut off the pipeline solenoid valve and the pressure relief valve in a safety mode through a set program to end the test.

[0054] In S400 and S500, after the gas is introduced until the inlet pressure of the hydrogen pressure reducer reaches the set minimum inlet pressure, the test module outputs data in real time, and the data processing module receives and analyzes it. The relationship analysis information can be a time variation curve set of the test module output data, and the pressure relief valve action time is marked on the time variation curve set. Specifically, the horizontal axis is time, the pipeline solenoid valve opening time t = 0, until the pipeline solenoid valve closing time, the vertical axis is the hydrogen flow rate, the hydrogen pressure reducer inlet pressure, and the outlet pressure change curve, and at the same time, the pressure relief valve action time is marked on the hydrogen flow rate, the hydrogen pressure reducer inlet pressure, and the outlet pressure change curve, forming a time variation curve set of the output data, which is displayed as the data result of this test.

[0055] The matched hydrogen flow that meets the hydrogen requirements of the fuel cell stack can be determined based on the target stack inlet pressure to be measured. The matching hydrogen flow is conducive to optimal regulation of the hydrogen flow in the actual new energy vehicle hydrogen supply system to ensure efficient use of the fuel cell.

[0056] At the same time, on the basis of meeting the target fuel cell stack inlet pressure to be tested, the performance of the hydrogen pressure reducer can be analyzed through the data relationship between the hydrogen flow rate, the hydrogen pressure reducer inlet pressure, and the outlet pressure. Since the test process is carried out under the condition of meeting the target fuel cell stack inlet pressure to be tested, it provides a more realistic application environment for the performance evaluation of the hydrogen pressure reducer, and the performance evaluation will be more accurate.

[0057] In addition, the performance of the hydrogen pressure reducer can be further analyzed based on the data relationship between the target fuel cell stack inlet pressure and the hydrogen pressure reducer inlet pressure and outlet pressure, so as to achieve two-dimensional performance analysis through two different data relationships in one test, thereby improving the comprehensiveness and accuracy of the performance evaluation.

[0058] In S600, the system can achieve repeatability of the test process, so when a second test verification is needed, the same parameters can be directly set to perform the verification, and the verification result is highly reliable.

[0059] When it is necessary to test the target stack inlet pressure value range of 8-10bar or 10-12bar, the initial values ​​of the three relief valve pressure thresholds, the change values ​​each time, and the target values ​​can be adjusted accordingly. Other parameters can be adapted and adjusted to provide simulations of different types of stack inlet voltages and simulate different operating environments. By repeating the above tests, the flow pressure regulator flow pressure and other related data of the hydrogen supply system can be automatically, efficiently and quickly obtained. When the target stack inlet pressure to be tested changes dynamically within the range of 8-10bar or 10-12bar, the change trend of the optimal hydrogen supply flow rate can be increased, and the difference analysis of the test results when each range changes dynamically can be performed, providing multi-dimensional data support for the subsequent practical application of hydrogen supply flow rate adjustment optimization. Through this system and method, the dynamic change mode of the hydrogen supply flow value of the conventional mainstream stack inlet pressure can be adapted, and more operating environments can be simulated, which greatly improves the versatility and test accuracy of the system.

[0060] When it is necessary to test another hydrogen pressure reducer, replace the hydrogen pressure reducer, set the corresponding parameters, and the test analysis can also be completed safely and conveniently in the above manner.

[0061] A hydrogen fuel cell hydrogen supply flow test system and method provided in the present embodiment can simulate the stack inlet pressure when the new energy vehicle hydrogen supply system is in operation through a back pressure regulating container and a pressure relief valve, and can meet the test requirements of different brands and different types of stack inlet pressure under dynamic changes through the combination of the pressure relief valve and the change mode of the pressure relief pressure threshold, and the different change modes form different dynamic changes to simulate different fuel cell operation conditions, breaking through the conventional inherent way of using fuel cells for testing to ensure authenticity, and changing to the steady voltage state of the back-end simulated stack inlet voltage as the starting point, cleverly using the configuration of the back pressure regulating container and the pressure relief valve, avoiding the defects of using fuel cells in conventional testing processes, balancing the authenticity of the test environment and the accuracy of the test results, and reducing the test cost. The system has a simple structure, a convenient control method, efficient use of gas sources, and is economical and environmentally friendly.

[0062] Embodiment 2

[0063] Different from the first embodiment, the optimal hydrogen supply flow rate is tested separately with a target stack inlet pressure value to be tested.

[0064] In S100, the preset strategy is to select a pressure relief valve according to the target stack inlet pressure value to be measured, and set the pressure relief pressure threshold of the pressure relief valve to the target stack inlet pressure value to be measured, and the pressure relief pressure thresholds of other pressure relief valves are greater than the target stack inlet pressure value to be measured. Specifically, the first pressure relief valve is selected, the target stack inlet pressure value to be measured is 9 bar, the pressure relief pressure threshold of the first pressure relief valve is set to 9 bar, the pressure relief pressure thresholds of the second and third pressure relief valves are greater than 9 bar, and can be 11 bar, and the difference is set to a larger point to ensure that the second and third pressure relief valves are always closed.

[0065] In S300, when the gas pressure in the back pressure regulating container reaches 9 bar, the first pressure relief valve opens, and the gas begins to be discharged from the pressure relief pipeline corresponding to the first pressure relief valve until the inlet pressure of the hydrogen pressure reducer reaches the set minimum inlet pressure. Then, the pipeline solenoid valve and the pressure relief valve are shut off in safety mode to end the test.

[0066] In this embodiment, the optimal hydrogen supply flow rate matched by a single test of a target fuel cell stack inlet pressure value to be tested can be tested with a point value test simulating the dynamic change of the target fuel cell stack inlet pressure value to be tested, and the differences can be compared and analyzed to provide multi-dimensional data support for the adjustment and optimization of the hydrogen supply flow rate in subsequent practical applications.

[0067] The above is only an embodiment of the present invention. The common sense such as the known specific structure and characteristics in the scheme is not described in detail here. The ordinary technicians in the relevant field are aware of all the common technical knowledge in the technical field of the invention before the application date or priority date, can obtain all the existing technologies in the field, and have the ability to apply the conventional experimental means before that date. The ordinary technicians in the relevant field can improve and implement the scheme in combination with their own abilities under the enlightenment given by this application. Some typical known structures or known methods should not become obstacles for the ordinary technicians in the relevant field to implement this application. It should be pointed out that for the technicians in this field, without departing from the structure of the present invention, several deformations and improvements can be made, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicality of the patent.

Claims

1. A hydrogen fuel cell hydrogen supply flow test system, characterized in that: including an electrically connected control module, a data processing module and a test module; The test module comprises a gas storage tank, a pipeline solenoid valve, a flow meter, a hydrogen pressure reducer and a back pressure regulating container which are sequentially connected along the air flow direction, wherein an inlet pressure sensor is installed at the inlet position of the hydrogen pressure reducer, an outlet pressure sensor is installed at the outlet position of the hydrogen pressure reducer, and the back pressure regulating container is connected to a plurality of parallel pressure relief pipelines, and each pressure relief pipeline is provided with a pressure-adjustable pressure relief valve; The data processing module is used to collect the test module output data with timestamp in real time and send it to the control module, and is also used to aggregate the test module output data collected in real time for relationship analysis and processing; wherein the test module output data includes the flow and pressure data collected in real time by the flow meter, the inlet pressure sensor, and the outlet pressure sensor, respectively, and the real-time status information of the pressure relief valve; The control module is used to control the action of the test module and adjust parameter settings, and is also used to interact with the data processing module to adjust the action of the test module; wherein controlling the action of the test module includes controlling the opening and closing of the pipeline solenoid valve and several pressure relief valves according to the control strategy; the parameters include the pressure relief pressure threshold of the pressure relief valve and its change mode, as well as the inlet pressure threshold and outlet pressure threshold of the hydrogen pressure reducer.

2. A hydrogen fuel cell hydrogen supply flow test system according to claim 1, characterized in that: The test range of the flow meter is greater than the maximum flow of the hydrogen pressure reducer.

3. A hydrogen fuel cell hydrogen supply flow test system according to claim 1, characterized in that: The pressure relief pressure threshold of the pressure relief valve is not greater than the outlet pressure threshold of the hydrogen pressure reducer.

4. A hydrogen fuel cell hydrogen supply flow test system according to claim 1, characterized in that: The pressure relief pipelines are provided with three, and correspondingly three pressure relief valves are provided, namely, a first pressure relief valve, a second pressure relief valve and a third pressure relief valve.

5. A hydrogen fuel cell hydrogen supply flow test system according to claim 1, characterized in that: The gas in the gas storage tank is high-pressure nitrogen, and the initial pressure is greater than 35MPa and less than 43.8MPa; the pressure resistance of the pipeline solenoid valve and flow meter are not less than 43.8MPa; the inlet pressure threshold of the hydrogen pressure reducer is not greater than 43.8MPa.

6. A method for testing the hydrogen flow rate of a hydrogen fuel cell, characterized in that: Using a hydrogen fuel cell hydrogen supply flow test system as described in any one of claims 1 to 5, the method comprises the following steps: S100, system preparation, setting test module parameters according to test requirements, wherein a pressure relief valve is selected according to a preset strategy based on the target stack inlet pressure value or range to be tested, and a change mode of the pressure relief pressure threshold of the pressure relief valve is set; S200, start the test, the control module controls the pipeline solenoid valve to open, the pressure relief valve to close, the gas flows out of the gas storage tank, passes through the flow meter, the inlet pressure sensor, the hydrogen pressure reducer, the outlet pressure sensor, and enters the back pressure regulating container. The gas pressure in the back pressure regulating container gradually increases; S300, system adjustment, based on the change mode, on the basis of the dynamic change of the pressure relief pressure threshold of the pressure relief valve, when the gas pressure in the back pressure regulating container reaches the pressure relief pressure threshold of a pressure relief valve, the pressure relief valve is opened, and the other pressure relief valves are closed, and the gas is discharged from the corresponding pressure relief pipeline of the pressure relief valve; until the inlet pressure of the hydrogen pressure reducer reaches the set minimum inlet pressure, the control module controls the pipeline solenoid valve to close, and this test ends; S400, test module output data acquisition, after the gas is introduced until the inlet pressure of the hydrogen pressure reducer reaches the set minimum inlet pressure, the flow meter, the inlet pressure sensor and the outlet pressure sensor respectively collect the flow and pressure data in real time, and the pressure relief valve transmits the status information to the data processing module, and the data processing module receives the output data of the test module and sends it to the control module; S500, data processing, the data processing module performs data processing based on the test module output data that carries a timestamp and is data-marked at the time of the pressure relief valve actuation, and obtains relationship analysis information, wherein the relationship analysis includes the relationship between the target stack inlet pressure, hydrogen flow rate, and the hydrogen pressure reducer inlet pressure and outlet pressure; S600, conduct the next test, repeat this test for secondary test verification, or replace the hydrogen pressure reducer, change the target stack inlet pressure value or range to be tested, and conduct a new test when the gas in the gas tank meets the requirements.

7. A method for testing hydrogen supply flow of a hydrogen fuel cell according to claim 6, characterized in that: In S100, the preset strategy is to select at least three pressure relief valves according to the target stack inlet pressure range to be measured.

8. A method for testing hydrogen supply flow of a hydrogen fuel cell according to claim 7, characterized in that: The pressure relief pressure thresholds of at least three pressure relief valves are changed in such a manner that, within the target fuel cell stack inlet pressure range to be measured, the pressure relief pressure thresholds of at least three pressure relief valves are alternately increased in a preset manner; the pressure relief pressure thresholds of unselected pressure relief valves are set greater than the maximum target fuel cell stack inlet pressure.

9. A method for testing hydrogen supply flow of a hydrogen fuel cell according to claim 6, characterized in that: In S100, the preset strategy is to select a pressure relief valve according to the target fuel cell stack inlet pressure value to be measured, and set the pressure relief pressure threshold of the pressure relief valve to the target fuel cell stack inlet pressure value to be measured, and the pressure relief pressure thresholds of other pressure relief valves are greater than the target fuel cell stack inlet pressure value to be measured.

10. A method for testing hydrogen supply flow of a hydrogen fuel cell according to claim 6, characterized in that: In S500, the relationship analysis information is a set of time variation curves of the test module output data, and the action time of the pressure relief valve is marked on the set of time variation curves.

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