Hydrogen fuel cell activation testing device and method and medium

Abstract

The invention discloses a hydrogen fuel cell activation test method. The method comprises the following steps: S1, a system parameter setting stage; S2, a test stage; and S3, a system closing stage. S1, a system parameter setting stage: setting parameters of a pressure sensor, a micro electromagnetic valve group, a hydrogen fuel cell, a fan rotating speed and an alarm indication mark; s2, testing stages including a nitrogen purging stage, a constant-voltage discharge state, a starvation activation state, a second constant-voltage discharge state and a nitrogen purging stage; and S3, a system closing stage: pressing a closing button, firstly stopping an electronic load discharging program, switching to a nitrogen purging mode, closing the hydrogen branch high-voltage electromagnetic valve, opening the nitrogen branch high-voltage electromagnetic valve, stopping recording test data, and closing the system. The method has the advantages that the activation time is shortened while the catalyst is activated to guarantee the performance of the hydrogen fuel cell, the efficiency is improved for mass production activation of a production line, and the service life of the fuel cell is prolonged.

Description

Technical Field

[0001] The present invention relates to the technical field of hydrogen fuel cells, and in particular to a hydrogen fuel cell activation test device, method and medium. Background Art

[0002] In the initial stage of the PEMFC stack and system, the water vapor transmission channel in the membrane electrode is not established, or the activity of the fuel cell decreases due to internal water evaporation, impurity intrusion or Pt catalyst oxidation during the long-term parking of the fuel cell; therefore, the activation of the membrane electrode of the PEMFC stack and system is one of the steps that the PEMFC stack and system must go through before being put into use, that is, through appropriate activation process, the performance of PEMFC is gradually improved to achieve the required performance and voltage. The activation of PEMFC is actually the activation of the membrane electrode, that is, to improve the performance of the membrane electrode to the nominal value or the maximum value and finally reach a stable state before leaving the factory, that is, the fuel cell is activated.

[0003] Therefore, it is necessary to activate the newly manufactured or long-stored proton exchange membrane fuel cell stack before it is officially put into use, so as to humidify the proton membrane, activate the platinum-carbon catalyst, and improve the performance of MEA. At the same time, it is beneficial to reduce the failure rate of hydrogen fuel cells. There are various models and sizes of stacks in the factory. How to perform clamping activation tests according to the sizes of different stacks without reducing the activation performance of the stack, shortening the activation time, and improving the activation efficiency is a problem that needs to be solved urgently. In order to solve the above technical problems, the present invention provides a hydrogen fuel cell activation test device and method. Summary of the invention

[0004] In view of the above-mentioned deficiencies in the prior art, the technical problem to be solved by the present invention is: how to provide a hydrogen fuel cell activation test device and method that can perform activation tests according to different hydrogen fuel cell stack sizes.

[0005] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0006] A hydrogen fuel cell activation test method, comprising an S1 system parameter setting stage, an S2 test stage, and an S3 system shutdown stage;

[0007] S1 system parameter setting stage: including parameter settings of pressure sensor, micro solenoid valve group, hydrogen fuel cell, fan speed, and alarm indication;

[0008] The pressure sensor includes a pressure sensor P1 for displaying the hydrogen or nitrogen intake pressure and a pressure sensor P2 for displaying the pressure inside the fuel cell stack. The safety range of the pressure sensor P1 is 2 to 10 MPa, and the safety range of the pressure sensor P2 is 0.5 to 2 MPa. If the gas pressure value exceeds the upper and lower limits, an alarm prompt bar will pop up, and the subsequent working components cannot be opened for operation or the over-limit state exceeds 3 minutes without intervention, and the control system will automatically stop running.

[0009] The micro solenoid valve group is composed of four micro solenoid valves, SV1, SV2, SV3 and SV4. The SV1 is connected in parallel with the SV2 through a pipeline and in series with the SV3. The SV2 is connected in series with the SV4 through a pipeline, and the other end of the SV3 and the other end of the SV4 are connected to the exhaust pipe together; the SV1 and SV3 are connected to the hydrogen fuel cell vent 1 through a pipeline, and the SV2 and SV4 are connected to the hydrogen fuel cell vent 2 through a pipeline; the exhaust path can select SV1 and SV4 channels or SV2 and SV3 channels and the above two channels to switch exhaust cyclically; the exhaust time setting can select fixed time mode or current integration mode, the exhaust interval range of the fixed time mode is 0 to 1000S, the accuracy is 1S, the exhaust time range is 0 to 5S, and the accuracy is 0.1S; the exhaust interval period range of the current integration mode is 0 to 8000AS, the accuracy is 1AS, the exhaust time range is 0 to 3S, and the accuracy is 0.1S; when cyclic switching exhaust is selected, the number of cycles needs to be set;

[0010] Hydrogen fuel cell parameter setting: Set the membrane electrode single sheet active area, ranging from 0 to 300 cm 2 , set the number of membrane electrode pieces in the range of 0 to 300, the minimum lower limit voltage of a single membrane electrode in the range of 0 to 1V; the upper temperature threshold of the hydrogen fuel cell in the range of 0 to 100°C, and the minimum lower limit voltage of the hydrogen fuel cell in the range of 0 to 200V;

[0011] Fan speed setting: The fan speed changes with the fan temperature. First, set a first ambient temperature in the range of -10 to 15°C, corresponding to the fan's minimum speed 1, and the speed range is 0 to 50% of the maximum speed. Then set a second ambient temperature in the range of 0 to 55°C, corresponding to the minimum speed 2, and the speed range is 50% to 100%. When the ambient temperature is between the first ambient temperature and the second ambient temperature, the minimum speed increases linearly and evenly with the increase of the ambient temperature. The speed is

[0012] Alarm indicator: including hydrogen alarm indicator and system status indicator. The hydrogen alarm indicator detects hydrogen leakage in the system shell according to the built-in hydrogen concentration sensor of the test system. If there is hydrogen leakage, an alarm signal is issued, and a hydrogen alarm indicator appears on the software interface and flashes in red. If the alarm is not relieved for more than 60 seconds, the test system executes a shutdown command; the system status indicator is used to indicate the comprehensive status of the system. When the gas pressure, stack temperature, stack voltage, and single-cell battery voltage are all within the safe range, the "system ready" indicator appears on the interface and is always green. If any of the gas pressure, stack temperature, stack voltage, and single-cell battery voltage exceeds the safe range, it will turn into a yellow flashing alarm and the corresponding alarm prompt bar information will pop up. If the alarm is not relieved for more than 30 seconds, the test system will automatically execute the system shutdown command;

[0013] S2 test phase: The first step is to purge the hydrogen fuel cell with nitrogen for 180 seconds. After the purge is completed, the hydrogen fuel cell enters the open circuit monitoring state without any discharge action. After maintaining the open circuit state for 60 seconds without any abnormality, it enters the constant voltage discharge state;

[0014] Step 2: The initial constant voltage value of the constant voltage discharge state is 60V. After every 300S of constant voltage discharge time, the constant voltage value will decrease by 1V and continue the cyclic constant voltage discharge. When the total current is ≥25A or the total voltage is <48V, the constant voltage discharge will stop and enter the starvation activation state.

[0015] Step 3: Starvation activation state, the load current is set to 25A for starvation loading. When the loading time exceeds 3S or the total voltage is lower than 1V, the starvation loading is stopped, and after entering the rest state for 30S, the previous starvation loading is continued. After 3 cycles, the second constant voltage discharge state is entered;

[0016] Step 4: The second constant voltage discharge state, the initial constant voltage value is 55V, the constant voltage value will decrease by 1V after every 60S of constant voltage discharge time, and the cyclic constant voltage discharge will continue. When the total voltage is less than 51V, the constant voltage discharge time is changed to 30S, and the cyclic discharge is continued until the total voltage is less than 48V, and then the test is terminated. During any of the above steps 1 to 4, if the minimum voltage of the single membrane electrode is lower than 0.2V, the test is terminated directly;

[0017] Step 5: Purge the hydrogen fuel cell with nitrogen for 30 seconds, then end the test;

[0018] S3 system shutdown stage: Press the shutdown button to first stop the electronic load discharge program, switch to nitrogen purge mode, close the hydrogen branch high-pressure solenoid valve, open the nitrogen branch high-pressure valve, SV2 and SV3 are powered on and long-term, SV1 and SV4 are normally closed; after 3 minutes of continuous purge, the nitrogen branch high-pressure solenoid valve is closed, SV2 and SV3 solenoid valves are closed, test data recording stops, and the system is shut down.

[0019] A hydrogen fuel cell activation test device using the above-mentioned test method comprises an activation test platform and a fuel cell detection mechanism installed on the activation test platform; the fuel cell detection mechanism comprises a transverse limit guide rail arranged on the upper end surface of the activation test platform, the transverse limit guide rail is arranged in parallel along the length direction of the activation test platform, and the two transverse limit guide rails are connected to limit rods through mutually cooperating sliders, so that the length direction of the limit rod is perpendicular to the length direction of the limit guide rails; vertically arranged fixed A fixed plate, a screw guide rail is vertically arranged in the middle of the fixed plate, two screw guide rails are arranged opposite to each other, and a probe fixing plate and a probe guide plate are connected between the two screw guide rails through a slider, the probe fixing plate and the probe guide plate are parallel to the upper end surface of the activation test platform, and the probe guide plate is located below the probe fixing plate; the probe fixing plate is provided with a probe fixing hole arranged through the thickness direction, and a plurality of probe fixing holes are evenly distributed on the plate surface of the probe fixing plate, and an inspection probe is inserted into the probe fixing hole; a stepping motor is fixedly arranged at the upper end of the screw guide rail.

[0020] Furthermore, the upper end surface of the activation test platform is stepped, so that the activation test platform is divided into a first test platform and a second test platform; a connecting plate is connected between the first test platform and the second test platform; and the fuel cell detection mechanism is located on the first test platform.

[0021] Furthermore, a battery test support plate is arranged between the two lateral limit guide rails, a test hydrogen inlet for connecting a hydrogen storage device and a test nitrogen inlet for connecting a nitrogen storage device are arranged on the first test platform, a fuel cell hydrogen inlet and a fuel cell nitrogen inlet for connecting a hydrogen fuel cell are arranged on the second test platform, and a pressure gauge P1 for detecting the pressure when hydrogen or nitrogen is introduced and a pressure gauge P2 for detecting the pressure when hydrogen or nitrogen is discharged are connected to the test hydrogen inlet and the test nitrogen inlet and the corresponding fuel cell hydrogen inlet and fuel cell nitrogen inlet through pipelines, and the pressure gauge P1 and the pressure gauge P2 are embedded in the connecting plate.

[0022] Furthermore, a push-type terminal is provided at one end of the fixed plate facing the connecting plate, a push-type terminal is also provided on the connecting plate, and a battery inspection module and a temperature display are also provided. An emergency shutdown button, a start switch, a shutdown switch, a communication interface, a pressure reducing valve, a hydrogen shut-off valve, and a nitrogen shut-off valve are sequentially provided on the second test platform along the length direction; the inspection probe and the stepper motor are connected to the push-type terminal on the fixed plate, the push-type terminal on the connecting plate, and the battery inspection module in sequence through wires; the battery inspection module includes a central control system, and is connected in parallel with the emergency shutdown button, the start switch, the shutdown switch, and the communication interface through wires; the hydrogen shut-off valve and the nitrogen shut-off valve are connected in parallel with each other and are respectively connected in series with the pressure reducing valve on their respective branches.

[0023] Furthermore, the bottom of the second test platform is hollowed out and separated by a partition, so that the bottom of the second test platform is divided into a distribution area, in which a power supply and distribution regulation module, a DC electronic load and a DC power supply are installed. The DC power supply is connected in series with the power supply and distribution regulation module and the battery inspection module in sequence; the electronic load is used to connect the output end of the hydrogen fuel cell to be tested and the central control system of the circuit inspection module.

[0024] A computer-readable storage medium stores computer instructions, which are used to implement a hydrogen fuel cell activation test method when executed by a processor.

[0025] In summary, the beneficial effects of the present invention are:

[0026] Compared with the existing technology, the test device can be used to intensify the test according to the different sizes of fuel cells, and has a wider range of adaptability. The repeated cross-activation of constant voltage discharge and starvation activation in the test method can reactivate the catalyst to ensure the performance of the hydrogen fuel cell, which is beneficial to shorten the activation time and improve the efficiency of mass production activation on the production line.

[0027] By connecting the computer and the activation test device interactively, the data of the hydrogen fuel cell stack during activation can be understood more intuitively. The electronic load can be adjusted according to the different specifications of the stack, so that the stack can be activated within the optimal performance range, which is conducive to analyzing the optimal performance of the stack.

[0028] By subdividing the hydrogen branch and the nitrogen branch, when the activation test or the practical use of the fuel cell stack is completed, the reverse nitrogen purge in the other path where hydrogen is not passed is more conducive to discharging the residual hydrogen in the hydrogen path and realizing the rapid shutdown of the fuel cell stack. It is also beneficial to avoid the residual hydrogen after the stack is shut down from mixing with the cathode oxygen, and to avoid the internal materials of the fuel cell stack from continuing to undergo electrochemical reactions after shutdown, thereby avoiding the reduction of catalyst activity caused by these unnecessary reactions, and is beneficial to extending the life of the fuel cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 Schematic diagram of the activation test method flow chart.

[0030] Figure 2 to Figure 4 It is a schematic diagram of the overall or partial structure of the activation test device.

[0031] Figure 5 for Figure 4 A partial enlarged schematic diagram of .

[0032] Figure 6 Schematic diagram of the gas pipeline of the activation test device.

[0033] Reference numerals:

[0034] 1. Activation test platform, 11. First test platform, 111. Test hydrogen inlet, 112. Test nitrogen inlet, 12. Second test platform, 121. Fuel cell hydrogen inlet, 122. Fuel cell nitrogen inlet, 123. Emergency shutdown button, 124. Start switch, 125. Shutdown switch, 126. Communication interface, 127. Pressure reducing valve, 128. Hydrogen shut-off valve, 129. Nitrogen shut-off valve, 13. Connecting plate, 2. Fuel cell detection mechanism, 21. Horizontal limit guide rail, 22. Limit rod, 23 Screw guide rail, 24. Probe fixing plate, 25. Inspection probe, 26. Probe guide plate, 3. Stepper motor, 4. Push-type terminal, 5. Temperature display DETAILED DESCRIPTION

[0035] The present invention is further described in detail below in conjunction with embodiments.

[0036] A hydrogen fuel cell activation test method, such as Figure 1 As shown, it includes S1 system parameter setting stage, S2 test stage, and S3 system shutdown stage;

[0037] S1 system parameter setting stage: including parameter settings of pressure sensor, micro solenoid valve group, hydrogen fuel cell, fan speed, and alarm indication;

[0038] Among them, the pressure sensor includes a pressure sensor P1 for displaying the intake pressure of hydrogen or nitrogen and a pressure sensor P2 for displaying the pressure in the fuel cell stack. The safety range of the pressure sensor P1 is 2 to 10 MPa, and the safety range of the pressure sensor P2 is 0.5 to 2 MPa. If the gas pressure value exceeds the upper and lower limits, the alarm prompt bar will pop up, and the subsequent working parts cannot be opened for operation or the over-limit state exceeds 3 minutes without intervention. The control system will automatically stop running. First, shut down the load, open the nitrogen high-pressure solenoid valve, switch the micro solenoid valve group to the nitrogen purge mode, and the cooling fan will run at the highest speed for 30 seconds and then shut down until the fuel cell stack voltage is lower than 10V, then shut down the purge and close the nitrogen high-pressure solenoid valve.

[0039] The micro solenoid valve group is composed of four micro solenoid valves, SV1, SV2, SV3 and SV4. The SV1 is connected in parallel with the SV2 through a pipeline and in series with the SV3. The SV2 is connected in series with the SV4 through a pipeline, and the other end of the SV3 and the other end of the SV4 are connected to the exhaust pipe together; the SV1 and SV3 are connected to the hydrogen fuel cell vent 1 through a pipeline, and the SV2 and SV4 are connected to the hydrogen fuel cell vent 2 through a pipeline; the exhaust path can select SV1 and SV4 channels or SV2 and SV3 channels and the above two channels to switch exhaust cyclically; the exhaust time setting can select fixed time mode or current integration mode, the exhaust interval range of the fixed time mode is 0 to 1000S, the accuracy is 1S, the exhaust time range is 0 to 5S, and the accuracy is 0.1S; the exhaust interval period range of the current integration mode is 0 to 8000AS, the accuracy is 1AS, the exhaust time range is 0 to 3S, and the accuracy is 0.1S; when cyclic switching exhaust is selected, the number of cycles needs to be set;

[0040] Hydrogen fuel cell parameter setting: Set the membrane electrode single sheet active area, ranging from 0 to 300 cm 2 , set the number of membrane electrode pieces in the range of 0 to 300, the minimum lower limit voltage of a single membrane electrode in the range of 0 to 1V; the upper temperature threshold of the hydrogen fuel cell in the range of 0 to 100°C, and the minimum lower limit voltage of the hydrogen fuel cell in the range of 0 to 200V;

[0041] Fan speed setting: The fan speed changes with the fan temperature. First, set a first ambient temperature in the range of -10 to 15°C, corresponding to the fan's minimum speed 1, and the speed range is 0 to 50% of the maximum speed. Then set a second ambient temperature in the range of 0 to 55°C, corresponding to the minimum speed 2, and the speed range is 50% to 100%. When the ambient temperature is between the first ambient temperature and the second ambient temperature, the minimum speed increases linearly and evenly with the increase of the ambient temperature. The speed is

[0042] Alarm indicator: including hydrogen alarm indicator and system status indicator. The hydrogen alarm indicator detects hydrogen leakage in the system shell according to the built-in hydrogen concentration sensor of the test system. If there is hydrogen leakage, an alarm signal is issued, and a hydrogen alarm indicator appears on the software interface and flashes in red. If the alarm is not relieved for more than 60 seconds, the test system executes a shutdown command; the system status indicator is used to indicate the comprehensive status of the system. When the gas pressure, stack temperature, stack voltage, and single-cell battery voltage are all within the safe range, the "system ready" indicator appears on the interface and is always green. If any of the gas pressure, stack temperature, stack voltage, and single-cell battery voltage exceeds the safe range, it will turn into a yellow flashing alarm and the corresponding alarm prompt bar information will pop up. If the alarm is not relieved for more than 30 seconds, the test system will automatically execute the system shutdown command;

[0043] S2 test phase: The first step is to purge the hydrogen fuel cell with nitrogen for 180 seconds. After the purge is completed, the hydrogen fuel cell enters the open circuit monitoring state without any discharge action. After maintaining the open circuit state for 60 seconds without any abnormality, it enters the constant voltage discharge state;

[0044] Step 2: The initial constant voltage value of the constant voltage discharge state is 60V. After every 300S of constant voltage discharge time, the constant voltage value will decrease by 1V and continue the cyclic constant voltage discharge. When the total current is ≥25A or the total voltage is <48V, the constant voltage discharge will stop and enter the starvation activation state.

[0045] Step 3: Starvation activation state, the load current is set to 25A for starvation loading. When the loading time exceeds 3S or the total voltage is lower than 1V, the starvation loading is stopped, and after entering the rest state for 30S, the previous starvation loading is continued. After 3 cycles, the second constant voltage discharge state is entered;

[0046] Step 4: The second constant voltage discharge state, the initial constant voltage value is 55V, the constant voltage value will decrease by 1V after every 60S of constant voltage discharge time, and the cyclic constant voltage discharge will continue. When the total voltage is less than 51V, the constant voltage discharge time is changed to 30S, and the cyclic discharge is continued until the total voltage is less than 48V, and then the test is terminated. During any of the above steps 1 to 4, if the minimum voltage of the single membrane electrode is lower than 0.2V, the test is terminated directly;

[0047] Step 5: Purge the hydrogen fuel cell with nitrogen for 30 seconds, then end the test;

[0048] During specific implementation, a pre-test detection stage can be added between the S1 system parameter setting stage and the S2 test stage: press the "start switch" button, first self-check whether the hydrogen high-pressure solenoid valve is open, whether the micro solenoid valve group is normal, whether the gas input and the temperature and pressure of the hydrogen fuel cell are normal, and whether the hydrogen is leaking. If everything is normal, turn on the electronic load and perform the test according to the set procedure; if the self-check fails, the alarm promotion bar will pop up, prompting the corresponding alarm information, and the test start and stop button will return to its original state. After the relevant problems are eliminated, it can be clicked to start again; during the execution process, if an alarm message occurs, the electronic load will be turned off, the test will be interrupted, the gas circuit and the stack configuration will be restored to the state before the test program is run, and the test start and stop button will return to its original state. After the relevant problems are eliminated, it can be turned on again to re-execute the test program from the beginning;

[0049] S3 system shutdown stage: Press the shutdown button to first stop the electronic load discharge program, switch to nitrogen purge mode, close the hydrogen branch high-pressure solenoid valve, open the nitrogen branch high-pressure solenoid valve, SV2 and SV3 are powered on and long-term, SV1 and SV4 are normally closed; after 3 minutes of continuous purge, the nitrogen branch high-pressure solenoid valve is closed, SV2 and SV3 solenoid valves are closed, test data stops recording, and the system is shut down.

[0050] Among them, the definition of the hydrogen purge action is: first shut down the electronic load discharge, close the nitrogen branch high-pressure solenoid valve, open the hydrogen branch high-pressure solenoid valve, SV1→SV4 is powered on and kept open, and the SV2→SV3 micro solenoid valve group is closed. When the purge is completed, the gas path configuration is immediately restored to the state before the purge.

[0051] Both the SV1→SV4 path and the SV2→SV3 path can be used as ventilation branches for hydrogen and nitrogen when actually used. For the convenience of management, the SV1→SV4 path is used as the hydrogen path during testing, and the SV2→SV3 path is set as the nitrogen path during testing. Finally, cross-circulation exhaust can be used during exhaust purge to help discharge residual hydrogen. When the stack is shut down to end the test, reverse nitrogen purge from another path that is not hydrogen-free is more conducive to discharging residual hydrogen in the hydrogen path to achieve rapid shutdown of the stack, avoid mixing of residual hydrogen with cathode oxygen after shutting down the stack, and avoid continued electrochemical reactions of internal materials of the stack after shutdown, thereby avoiding reduced catalyst activity caused by these unnecessary reactions and helping to extend the life of the fuel cell.

[0052] Definition of nitrogen purge action: First, shut down the electronic load discharge, close the hydrogen branch high-voltage solenoid valve, open the nitrogen branch high-voltage solenoid valve, SV2→SV3 is powered on and long-circuited, SV1→SV4 micro-solenoid valve group is closed, and the gas path configuration is immediately restored to the state before the purge when the purge is completed. Whether before or after the use of the stack, use nitrogen purge before executing the following instructions to avoid the mixing of hydrogen and oxygen in the air to form a hydrogen-oxygen interface. The formation of this interface will cause a high cathode potential, leading to carbon corrosion inside the cathode catalyst layer and agglomeration of platinum particles, which helps maintain the pressure and humidity balance inside the stack.

[0053] Definition of starvation activation action: First, shut down the electronic load discharge and configure it to CC mode constant current mode. When the stack temperature is <= 40°C, stop the cooling fan and quickly load the load with constant current according to the set load current.

[0054] A hydrogen fuel cell activation test device using the above-mentioned test method, such as Figure 2 to Figure 5 As shown, it includes an activation test platform 1 and a fuel cell detection mechanism 2 installed on the activation test platform 1; the fuel cell detection mechanism 2 includes a transverse limit rail 21 arranged on the upper end surface of the activation test platform 1, and the transverse limit rail 21 is arranged in parallel along the length direction of the activation test platform 1. The two transverse limit rails 21 are connected to limit rods 22 by mutually matching sliders, so that the length direction of the limit rod is perpendicular to the length direction of the limit rails; vertically arranged fixing plates are connected to both ends of the length direction of the transverse limit rails 21, and the middle of the fixing plates is vertically arranged There are screw guide rails 23, two of which are arranged opposite to each other and a probe fixing plate 24 and a probe guide plate 26 are connected between the two screw guide rails 23 through a slider, the probe fixing plate 24 and the probe guide plate 26 are parallel to the upper end surface of the activation test platform 1, and the probe guide plate 26 is located below the probe fixing plate 24; the probe fixing plate 24 has a probe fixing hole that penetrates along the thickness direction, and a plurality of probe fixing holes are evenly distributed on the plate surface of the probe fixing plate 24, and an inspection probe 25 is inserted into the probe fixing hole; a stepping motor 3 is fixedly installed at the upper end of the screw guide rail 23.

[0055] When implementing, Figure 2As shown, the upper end surface of the activation test platform 1 is stepped, so that the activation test platform 1 is divided into a first test platform 11 and a second test platform 12; a connecting plate 13 is connected between the first test platform 11 and the second test platform 12; the fuel cell detection mechanism 2 is located on the first test platform 11. A battery test support plate is arranged between the two lateral limit guide rails 21, and the first test platform 11 is provided with a test hydrogen inlet 111 for connecting to a hydrogen storage device and a test nitrogen inlet 112 for connecting to a nitrogen storage device, and the second test platform 12 is provided with a fuel cell hydrogen inlet 121 and a fuel cell nitrogen inlet 122 for connecting to a hydrogen fuel cell, and the test hydrogen inlet 111 and the test nitrogen inlet 112 are connected to the corresponding fuel cell hydrogen inlet 121 and the fuel cell nitrogen inlet 122 through pipelines, and a pressure gauge P1 for detecting the pressure when hydrogen or nitrogen is introduced and a pressure gauge P2 for detecting the pressure when hydrogen or nitrogen is discharged, and the pressure gauge P1 and the pressure gauge P2 are embedded in the connecting plate 13. As shown Figure 2 As shown, a push-type terminal 4 is provided at one end of the fixed plate facing the connecting plate 13, a push-type terminal 4 is also provided on the connecting plate, and a battery inspection module and a temperature display 5 are also provided. An emergency shutdown button 123, a start switch 124, a shutdown switch 125, a communication interface 126, a pressure reducing valve 127, a hydrogen shut-off valve 128, and a nitrogen shut-off valve 129 are sequentially provided on the second test platform 12 along the length direction; the inspection probe 25 and the stepper motor 3 are connected to the push-type terminal 4 on the fixed plate, the push-type terminal 4 on the connecting plate 13, and the battery inspection module in sequence through wires; the battery inspection module includes a central control system, and is connected in parallel with the emergency shutdown button 123, the start switch 124, the shutdown switch 125, and the communication interface 126 through wires; the hydrogen shut-off valve 128 and the nitrogen shut-off valve 129 are connected in parallel with each other and are respectively connected in series with the pressure reducing valve 127 on their respective branches. In specific implementation, the hydrogen shut-off valve 128 is connected in series with the high-voltage battery valve of the hydrogen branch, and the hydrogen shut-off valve 128 is located between the hydrogen storage device and the high-voltage battery valve of the hydrogen branch; the nitrogen shut-off valve 129 is connected in series with the high-voltage battery valve of the nitrogen branch, and the nitrogen shut-off valve 129 is located between the nitrogen storage device and the high-voltage battery valve of the nitrogen branch; in this way, when the high-voltage battery valve of the hydrogen or nitrogen branch fails, the supply of hydrogen or nitrogen can be manually shut off by the hydrogen or nitrogen shut-off valve; only one of the high-voltage solenoid valve of the hydrogen branch and the high-voltage solenoid valve of the nitrogen branch can be opened at the same time, and they cannot be opened at the same time; for example, when testing a hydrogen fuel cell, the high-voltage solenoid valve of the hydrogen branch is opened. After the test is completed, the high-voltage solenoid valve of the hydrogen branch is closed, and the high-voltage solenoid valve of the nitrogen branch is opened to clean the battery stack.

[0056] When implementing it, Figure 6As shown, the gas pipeline of the test device is connected as follows: it includes a hydrogen branch L1, a nitrogen branch L2 and a hydrogen fuel cell loop L3; the hydrogen branch is connected in parallel with the nitrogen branch, and after converging into a main line Y1, they are connected in series with the hydrogen fuel cell loop; a pressure sensor P1 for displaying the hydrogen or nitrogen intake pressure, a pressure regulating valve and a sensor P2 for displaying the pressure inside the stack are connected in sequence between the hydrogen branch and the nitrogen branch and the hydrogen fuel cell; the hydrogen branch L1 includes a hydrogen shut-off valve 128, a one-way valve and a hydrogen branch high-pressure solenoid valve connected in sequence; the nitrogen branch L2 includes a nitrogen shut-off valve 129, a one-way valve and a nitrogen branch high-pressure solenoid valve connected in sequence; the hydrogen fuel cell loop L3 includes a micro solenoid valve group, which consists of four micro solenoid valves, SV1, SV2, SV3 and SV4, and the SV1 is connected to the SV2 is connected in parallel through a pipeline and in series with the SV3. The SV2 is connected in series with the SV4 through a pipeline. The other end of the SV3 and the other end of the SV4 are connected to the exhaust pipe together; the SV1 and SV3 are connected to the hydrogen fuel cell vent 1 through a pipeline, and the SV2 and SV4 are connected to the hydrogen fuel cell vent 2 through a pipeline; the test hydrogen inlet 111 and the test nitrogen inlet 112 are respectively connected to the other ends of the hydrogen shut-off valve of the hydrogen branch L1 and the nitrogen shut-off valve of the nitrogen branch L2, and the other end of the main line Y1 is also divided into two branches, which are correspondingly connected to the fuel cell hydrogen inlet 121 and the fuel cell nitrogen inlet 122, so that the other ends of SV1 and SV2 in the hydrogen fuel cell loop L3 are correspondingly connected to the fuel cell hydrogen inlet 121 and the fuel cell nitrogen inlet 122.

[0057] like Figure 3 As shown, the second test platform 12 is hollowed out below and separated by a partition, and the second test platform 12 is divided into a power distribution area below. A power supply and distribution adjustment module, a DC electronic load and a DC power supply are installed in the power distribution area. The DC power supply is connected in series with the power supply and distribution adjustment module and the battery inspection module in sequence; the electronic load is used to connect the output end of the hydrogen fuel cell to be tested and the central control system of the circuit inspection module. In this way, the central control system controls the operating power of the electronic load according to the test requirements, so that the electric energy generated by the hydrogen fuel cell to be tested is consumed by the electronic load, and the fuel cell is operated under this power environment to check the performance of the stack.

[0058] Working principle: The control program involved in the above-mentioned activation test method is stored in a computer-readable storage medium in the form of computer code instructions, the fuel cell test device is connected to the computer through a communication interface, the parameters to be tested are input into the computer, and the computer transmits the corresponding instructions to the inspection module of the test device. The tester clicks the start switch and adjusts the intake pressure according to the required pressure of the fuel cell. The test device can then perform the test according to the predetermined control instructions; when an emergency occurs during the test phase, the emergency shutdown button can be pressed to stop the test to ensure the safety of the test and avoid damage to the fuel cell and the test device; if the high-pressure solenoid valve of the hydrogen branch and the solenoid valve of the nitrogen branch fail after pressing the emergency button and cannot be executed according to the predetermined instructions, the hydrogen shut-off valve can also be manually closed, and the nitrogen shut-off valve can be opened to purge the residual hydrogen in the test stack to prevent the fuel cell from continuing to work with residual hydrogen.

[0059] Before the test, the hydrogen fuel cell to be tested is placed on the battery test support plate, and then the limit rod is used to fix the fuel cell to be tested horizontally along the limit guide rail. During the test, the stepper motor drives the lead screw guide rail to rotate, thereby driving the probe guide plate and the probe fixing plate on the slider on the lead screw guide rail to move downward. This can not only fix the fuel cell to be tested vertically, but also facilitate the inspection probe on the probe fixing plate to pass through the probe guide plate and abut against the fuel cell to be tested, so as to obtain stable real-time data of the test fuel cell. The limit rod that can be moved horizontally and the probe guide plate that can move up and down can clamp fuel cells of different models, specifications and sizes horizontally and vertically.

[0060] A computer-readable storage medium stores computer instructions, wherein the computer instructions are used to implement the above-mentioned hydrogen fuel cell activation test method when executed by a processor.

[0061] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A hydrogen fuel cell activation test method, characterized in that: It includes S1 system parameter setting stage, S2 testing stage, and S3 system shutdown stage; S1 system parameter setting stage: including parameter settings of pressure sensor, micro solenoid valve group, hydrogen fuel cell, fan speed, and alarm indication; Among them, the pressure sensor includes a pressure sensor P1 for displaying the hydrogen or nitrogen intake pressure and a pressure sensor P2 for displaying the pressure in the fuel cell stack. The safety range of the pressure sensor P1 is 2 to 10 MPa, and the safety range of the pressure sensor P2 is 0.5 to 2 MPa. If the gas pressure value exceeds the upper and lower limits, the alarm prompt bar will pop up, and the subsequent working parts cannot be opened for operation or the over-limit state exceeds 3 minutes without intervention, and the control system will automatically stop running (first shut down the load, open the nitrogen high-pressure solenoid valve, switch the micro solenoid valve group to the nitrogen purge mode, and shut down the cooling fan at the highest speed for 30 seconds until the fuel cell stack voltage is lower than 10V, then shut down the purge and close the nitrogen high-pressure solenoid valve); The micro solenoid valve group is composed of four micro solenoid valves, SV1, SV2, SV3 and SV4. The SV1 is connected in parallel with the SV2 through a pipeline and in series with the SV3. The SV2 is connected in series with the SV4 through a pipeline, and the other end of the SV3 and the other end of the SV4 are connected to the exhaust pipe together; the SV1 and SV3 are connected to the hydrogen fuel cell vent 1 through a pipeline, and the SV2 and SV4 are connected to the hydrogen fuel cell vent 2 through a pipeline; the exhaust path can select SV1 and SV4 channels or SV2 and SV3 channels and the above two channels to switch exhaust cyclically; the exhaust time setting can select fixed time mode or current integration mode, the exhaust interval range of the fixed time mode is 0 to 1000S, the accuracy is 1S, the exhaust time range is 0 to 5S, and the accuracy is 0.1S; the exhaust interval period range of the current integration mode is 0 to 8000AS, the accuracy is 1AS, the exhaust time range is 0 to 3S, and the accuracy is 0.1S; when cyclic switching exhaust is selected, the number of cycles needs to be set; Hydrogen fuel cell parameter setting: Set the membrane electrode single sheet active area, ranging from 0 to 300 cm 2 , set the number of membrane electrode pieces in the range of 0 to 300, the minimum lower limit voltage of a single membrane electrode in the range of 0 to 1V; the upper temperature threshold of the hydrogen fuel cell in the range of 0 to 100°C, and the minimum lower limit voltage of the hydrogen fuel cell in the range of 0 to 200V; Fan speed setting: The fan speed changes with the fan temperature. First, set a first ambient temperature in the range of -10 to 15°C, corresponding to the fan's minimum speed 1, and the speed range is 0 to 50% of the maximum speed. Then set a second ambient temperature in the range of 0 to 55°C, corresponding to the minimum speed 2, and the speed range is 50% to 100%. When the ambient temperature is between the first ambient temperature and the second ambient temperature, the minimum speed increases linearly and evenly with the increase of the ambient temperature, and the speed is the minimum speed. 2- Minimum speed 1 Second ambient temperature-first ambient temperature; Alarm indicator: including hydrogen alarm indicator and system status indicator. The hydrogen alarm indicator detects hydrogen leakage in the system shell according to the built-in hydrogen concentration sensor of the test system. If there is hydrogen leakage, an alarm signal is issued, and a hydrogen alarm indicator appears on the software interface and flashes in red. If the alarm is not relieved for more than 60 seconds, the test system executes a shutdown command; the system status indicator is used to indicate the comprehensive status of the system. When the gas pressure, stack temperature, stack voltage, and single-cell battery voltage are all within the safe range, the "system ready" indicator appears on the interface and is always green. If any of the gas pressure, stack temperature, stack voltage, and single-cell battery voltage exceeds the safe range, it will turn into a yellow flashing alarm and the corresponding alarm prompt bar information will pop up. If the alarm is not relieved for more than 30 seconds, the test system will automatically execute the system shutdown command; S2 test phase: The first step is to purge the hydrogen fuel cell with nitrogen for 180 seconds. After the purge is completed, the hydrogen fuel cell enters the open circuit monitoring state without any discharge action. After maintaining the open circuit state for 60 seconds without any abnormality, it enters the constant voltage discharge state; Step 2: The initial constant voltage value of the constant voltage discharge state is 60V. After every 300S of constant voltage discharge time, the constant voltage value will decrease by 1V and continue the cyclic constant voltage discharge. When the total current is ≥25A or the total voltage is <48V, the constant voltage discharge will stop and enter the starvation activation state. Step 3: Starvation activation state, the load current is set to 25A for starvation loading. When the loading time exceeds 3S or the total voltage is lower than 1V, the starvation loading is stopped, and after entering the rest state for 30S, the previous starvation loading is continued. After 3 cycles, the second constant voltage discharge state is entered; Step 4: The second constant voltage discharge state, the initial constant voltage value is 55V, the constant voltage value will decrease by 1V after every 60S of constant voltage discharge time, and the cyclic constant voltage discharge will continue. When the total voltage is less than 51V, the constant voltage discharge time is changed to 30S, and the cyclic discharge is continued until the total voltage is less than 48V, and then the test is terminated. During any of the above steps 1 to 4, if the minimum voltage of the single membrane electrode is lower than 0.2V, the test is terminated directly; Step 5: Purge the hydrogen fuel cell with nitrogen for 30 seconds, then end the test; S3 system shutdown stage: Press the shutdown button to first stop the electronic load discharge program, switch to nitrogen purge mode, close the hydrogen branch high-pressure solenoid valve, open the nitrogen branch high-pressure solenoid valve, SV2 and SV3 are powered on and long-term, SV1 and SV4 are normally closed; after 3 minutes of continuous purge, the nitrogen branch high-pressure solenoid valve is closed, SV2 and SV3 solenoid valves are closed, test data stops recording, and the system is shut down.

2. A hydrogen fuel cell activation test device using the test method of claim 1, characterized in that: The invention comprises an activation test platform (1) and a fuel cell detection mechanism (2) installed on the activation test platform (1); the fuel cell detection mechanism (2) comprises a transverse limit guide rail (21) arranged on the upper end surface of the activation test platform (1), the transverse limit guide rail (21) being arranged in parallel along the length direction of the activation test platform (1), and a limit rod (22) being connected to the two transverse limit guide rails (21) by means of mutually matching slide blocks, so that the length direction of the limit rod is perpendicular to the length direction of the limit guide rail; vertically arranged fixing plates are connected to both ends of the length direction of the transverse limit guide rail (21), and a screw guide is vertically arranged in the middle of the fixing plate. The two screw guide rails are arranged opposite to each other and a probe fixing plate (24) and a probe guide plate (26) are connected between the two screw guide rails (23) through a slider, the probe fixing plate (24) and the probe guide plate (26) are parallel to the upper end surface of the activation test platform (1), and the probe guide plate (26) is located below the probe fixing plate (24); the probe fixing plate (24) has a probe fixing hole that penetrates along the thickness direction, and a plurality of probe fixing holes are evenly distributed on the plate surface of the probe fixing plate (24), and a patrol probe (25) is inserted into the probe fixing hole; a stepping motor (3) is fixedly arranged at the upper end of the screw guide rail (23).

3. The hydrogen fuel cell activation test device according to claim 2, characterized in that: The upper end surface of the activation test platform (1) is distributed in a stepped manner, so that the activation test platform (1) is divided into a first test platform (11) and a second test platform (12); a connecting plate (13) is connected between the first test platform (11) and the second test platform (12); and the fuel cell detection mechanism (2) is located on the first test platform (11).

4. The hydrogen fuel cell activation test device according to claim 3, characterized in that: A battery test support plate is arranged between the two transverse limit guide rails (21); a test hydrogen inlet (111) for connecting a hydrogen storage device and a test nitrogen inlet (112) for connecting a nitrogen storage device are arranged on the first test platform (11); a fuel cell hydrogen inlet (121) and a fuel cell nitrogen inlet (122) for connecting a hydrogen fuel cell are arranged on the second test platform (12); a pressure gauge P1 for detecting the pressure when hydrogen or nitrogen is introduced and a pressure gauge P2 for detecting the pressure when hydrogen or nitrogen is discharged are connected between the test hydrogen inlet (111) and the test nitrogen inlet (112) and the corresponding fuel cell hydrogen inlet (121) and the fuel cell nitrogen inlet (122) through pipelines; the pressure gauge P1 and the pressure gauge P2 are embedded in the connection plate (13).

5. The hydrogen fuel cell activation test device according to claim 3, characterized in that: The fixing plate is provided with a push-type terminal (4) at one end facing the connecting plate (13), the connecting plate is also provided with a push-type terminal (4), and is also provided with a battery inspection module and a temperature display (5); the second test platform (12) is provided with an emergency shut-off button (123), a start switch (124), a shut-off switch (125), a communication interface (126), a pressure reducing valve (127), a hydrogen shut-off valve (128), and a nitrogen shut-off valve (129) in sequence along the length direction; the inspection probe (25) and The stepper motor (3) is connected to the push-type terminal (4) on the fixing plate, the push-type terminal (4) on the connecting plate (13), and the battery inspection module in sequence through wires; the battery inspection module includes a central control system and is connected in parallel with the emergency shutdown button (123), the start switch (124), the shutdown switch (125), and the communication interface (126) through wires; the hydrogen shut-off valve (128) and the nitrogen shut-off valve (129) are connected in parallel with each other and are respectively connected in series with the pressure reducing valve (127) on their respective branches.

6. The hydrogen fuel cell activation test device according to claim 5, characterized in that: The lower part of the second test platform (12) is hollowed out and separated by a partition, so that the lower part of the second test platform (12) is divided into a power distribution area, in which a power supply and distribution adjustment module, a DC electronic load and a DC power supply are installed, and the DC power supply is connected in series with the power supply and distribution adjustment module and the battery inspection module in sequence; the electronic load is used to connect the output end of the hydrogen fuel cell to be tested and the central control system of the circuit inspection module.

7. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores computer instructions, and the computer instructions are used to implement the hydrogen fuel cell activation test method of claim 1 when executed by a processor.

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