Proton exchange membrane fuel cell catalyst drying and measurement system and control method

Abstract

This invention discloses a system and control method for drying and measuring the catalyst layer of a proton exchange membrane fuel cell, comprising a dry air generation unit, an air heating unit, a humid air generation unit, a drying unit, and a measurement unit connected sequentially by pipelines, as well as a data acquisition unit and a control unit. The control unit controls a frequency converter, a temperature control box, a precision flow regulating valve, and a T-valve. This invention enables the control of the temperature, humidity, and wind speed of the membrane to be dried; it achieves lateral adjustment of the membrane and vertical adjustment of the distance between the upper and lower air outlets and the membrane through a sliding device and a penetration groove; it achieves the switching of the membrane measurement and drying process in the system through the opening and closing of the T-valve; and it can also plot the mass change curve based on the system temperature, humidity, and wind speed monitored in real time by the data acquisition unit.

Description

Technical Field

[0001] This invention belongs to the field of fuel cells, specifically relating to a drying and measurement system and control method for the catalyst layer of a proton exchange membrane fuel cell with adjustable drying conditions. Background Technology

[0002] With industrial development, energy scarcity has become increasingly severe, making the development of new energy sources a crucial issue that must be addressed. Fuel cells, due to their high energy density, high efficiency, and zero emissions, are considered one of the ideal clean energy sources at present. Among fuel cells, proton exchange membrane fuel cells (PEMFCs) have significant application prospects in automobiles and many other fields, thus attracting considerable attention.

[0003] In PEMFCs, the catalyst layer (CL) is the site of electrochemical reactions. It consists of a catalyst (such as Pt / C) and a polymer electrolyte (such as Nafion). The carbon-supported catalyst particles conduct electrons, while the Nafion conducts protons. Together, they form a complex network of porous structures that conduct reactant gases and water. Its structure directly determines the performance of the PEMFC; therefore, the CL plays a crucial role in energy conversion.

[0004] The CL in PEMFC should have high effective porosity, electrochemically active surface area, and good ionomer distribution. Among these, CL drying is a very important step in the MEA (membrane electrode assembly) fabrication process. However, current drying systems have fixed air velocity, relative humidity, and temperature, making them single-condition drying systems. Therefore, we are considering ways to adjust the drying conditions to obtain a catalyst layer with better performance. Summary of the Invention

[0005] This invention addresses the shortcomings of existing technologies by providing a proton exchange membrane fuel cell (PEMFC) catalyst layer drying and measurement system and control method with adjustable drying conditions. While realistically simulating the actual production process of the catalyst layer drying, it enables adjustable drying conditions for the PEMFC catalyst layer. The catalytic conditions can be arbitrarily adjusted for different membrane electrodes to achieve the best drying conditions, thereby obtaining the optimal catalyst layer structure and improving the performance of the PEMFC.

[0006] The objective of this invention is achieved through the following technical solution:

[0007] A proton exchange membrane fuel cell catalyst layer drying and measurement system includes a dry air generating unit, an air heating unit, a humid air generating unit, a drying unit, and a measurement unit connected sequentially by pipelines, as well as a data acquisition unit and a control unit. The dry air generating unit has its airflow speed controlled by a frequency converter. The air heating unit heats the air from the dry air generating unit, and its heating temperature is controlled by a temperature control box. The humid air generating unit humidifies the air from the air heating unit. The drying unit has a movable platform for placing the membrane to be dried, and an upper air outlet, a lower air outlet, an upper air inlet, and a lower air inlet are respectively provided on the upper and lower surfaces of the movable platform. The measurement unit is detachably connected to the movable platform and is used to measure the dried material.

[0008] The data acquisition unit includes a dry air flow meter, a steam flow meter, a temperature sensor, a humidity sensor, and a wind speed sensor, and is connected to the control unit. The dry air flow meter is located on the pipeline between the dry air generating unit and the air heating unit. One end of a humidification-side outlet pipeline is connected to the outlet of the humidified air generating unit, and the other end is connected to a Y-type tee. The Y-type tee is connected to the upper air inlet and the lower air inlet of the drying unit, respectively. Furthermore, a precision flow regulating valve, a steam flow meter, and a T-type valve are sequentially arranged on the humidification-side outlet pipeline facing the Y-type tee. Temperature sensors, humidity sensors, and wind speed sensors are installed at both the lower and upper air inlets of the drying unit.

[0009] The control unit is used to control the frequency converter, temperature control box, precision flow regulating valve and T-valve, thereby realizing the regulation of system wind speed, temperature and humidity, as well as the measurement of membrane and the conversion of drying process.

[0010] Furthermore, the drying unit includes an upper drying chamber and a lower drying chamber connected by hinges. The upper drying chamber is provided with an upper static pressure chamber, one side of which is connected to an upper air inlet, and multiple upper air outlets are opened at its bottom. The lower drying chamber is provided with a lower static pressure chamber, one side of which is connected to a lower air inlet, and multiple lower air outlets are opened at its top. The humid air generated by the humid air generating unit is diverted through a Y-shaped tee. Part of the humid air enters the lower static pressure chamber through the lower air inlet and is then blown out through the lower air outlets, while the other part of the humid air enters the upper static pressure chamber through the upper air inlet and is then blown out through the upper air outlets. The upper and lower air outlets are staggered and their opening directions are opposite to each other, both facing the membrane to be dried.

[0011] The measuring unit is located below the drying unit and includes a balance and a sliding device. The balance is located on top of the sliding device and can slide horizontally along the sliding device. The top of the balance is detachably connected to a support frame. The top of the support frame has an upper support plate for placing the film to be dried.

[0012] Furthermore, the membrane is a membrane coated with a proton exchange membrane fuel cell catalyst layer.

[0013] Furthermore, the lower air outlet is connected to the lower static pressure chamber and its top is provided with a porous flow equalization plate, on which uniformly distributed through holes are arranged.

[0014] Furthermore, through slots are provided on both sides of the upper and lower air inlets, with bolts on them. The tightness of the bolts controls the up and down movement of the upper and lower static pressure chambers along the slot holes.

[0015] Furthermore, the distances between the upper and lower air outlets and the upper support plate are equal.

[0016] The control method for the proton exchange membrane fuel cell catalyst layer drying and measurement system is as follows:

[0017] Step 1: Control the T-valve to rotate and open the pipeline, turn on the fan, control the frequency converter to adjust the air speed entering the pipeline, control the temperature control box to adjust the air heating unit to heat the air temperature, and the humid air generating unit to increase the air humidity to 30%-100% to form humid air. Subsequently, the control unit controls the opening of the precision flow regulating valve to control the humid air entering the drying unit, thereby drying the measurement system; the data acquisition unit collects the current temperature, humidity and wind speed data and transmits them to the control unit.

[0018] Step 2: Continue the above drying process until the measured temperature, humidity and wind speed data do not exceed the preset values. Then, close the T-valve, fan, frequency converter, temperature control box and precision flow regulating valve.

[0019] Step 3: Place the membrane to be dried on a tray;

[0020] Step 4: Open the T-valve and turn on the fan to send air into the system; record the measured temperature, humidity, and wind speed data, and turn on the frequency converter, temperature control box, and precision flow regulating valve according to the working process of Step 1. The humid air entering the drying unit will simultaneously dry the upper and lower surfaces of the membrane. During the drying process, the sliding device controls the balance to move back and forth to dry the membrane evenly. After the predetermined drying time, close the T-valve to make the drying chamber windless and stop the sliding device from working; use the measuring unit to measure the current weight of the membrane.

[0021] Step 5: When the preset measurement quality requirements are met, the drying process is completed and the membrane is removed; otherwise, return to step 4 to continue the drying process.

[0022] Furthermore, if it is not necessary to draw a quality change curve, the preset quality measurement requirement in step five is the drying time of 3-5 minutes in step four.

[0023] Furthermore, if it is necessary to plot a quality change curve, the preset measurement quality requirements in step five are:

[0024] The drying time for step four is 3-5 seconds;

[0025] Repeat the drying process in step four, recording the measured temperature, humidity, and wind speed data until the difference between the current weighing and the previous weighing is within 1%, at which point drying is complete; close the T-valve, stop all equipment, and plot the output temperature, humidity, and wind speed data as a mass change curve.

[0026] Compared with the prior art, the beneficial effects of the technical solution of the present invention are:

[0027] This invention enables the control of temperature, humidity, and wind speed of the membrane to be dried; it allows for lateral adjustment of the membrane and vertical adjustment of the distance between the upper and lower air outlets and the membrane through a sliding device and a penetration groove; it enables the measurement of the membrane and the conversion of the drying process in the system through the opening and closing of a T-valve; and it can also plot the quality change curve based on the system temperature, humidity, and wind speed monitored in real time by the data acquisition unit.

[0028] Compared to the drying process in practical applications where the drying conditions remain constant (temperature, relative humidity, and wind speed are all constant), this invention can continuously change the drying conditions according to the catalytic layer structure of the membrane electrode to achieve the best drying conditions, thereby obtaining the optimal catalytic layer structure and improving the performance of PEMFC; at the same time, the drying condition control device is simple and easy to operate and control. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the drying system described in this invention;

[0030] Figure 2 Show Figure 1 The rear view of the drying system shown;

[0031] Figure 3 This is a cross-sectional structural diagram of the drying unit of the drying system.

[0032] Figure 4 for Figure 3 Rear view of the drying oven module shown;

[0033] Figure 5 This is a flowchart of the control method for the drying and measurement system of the catalyst layer in a proton exchange membrane fuel cell.

[0034] In the picture:

[0035] 1: Fan; 2: Frequency converter; 3: Filter; 4: Dry air flow meter; 5: Temperature control box; 6: Heater; 7: Humidifier; 8: Precision flow regulating valve; 9: Steam flow meter; 10: T-valve; 11: Sliding device; 12: Balance; 13: Drying oven bracket; 14: Drying unit; 15: Y-type tee; 16: Lower base plate; 17: Slide rail; 18: Support frame; 19: Lower static pressure chamber; 20: Lower air outlet; 21: Perforated flow equalization plate; 22: Upper support plate; 23: Upper drying chamber; 24: Lower drying chamber; 25: Upper air outlet; 26: Upper static pressure chamber; 27: Air outlet; 28: Penetration slot; 29: Hinge; 30: Lower air inlet; 31: Upper air inlet Detailed Implementation

[0036] To make the objectives, technical solutions, beneficial effects, and significant advancements of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings provided in the examples of the present invention. Obviously, all the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0037] A proton exchange membrane fuel cell catalyst drying system with adjustable drying conditions includes a dry air generation unit, an air heating unit, a humid air generation unit, a drying unit, a measurement unit, a data acquisition unit, and a control unit. The dry air generation unit includes a fan 1 electrically connected to a frequency converter 2 for controlling the fan speed; the air heating unit is a heater 6 electrically connected to a temperature control box 5 for controlling its heating temperature; the humid air generation unit is a humidifier 7; the drying unit 14 includes an upper drying chamber 23 and a lower drying chamber 24; the measurement unit includes a balance 12 and a support frame 18; the data acquisition unit includes a dry air flow meter 4, a steam flow meter 9, a temperature sensor, a humidity sensor, and a wind speed sensor, and the components of the data acquisition unit are communicatively connected to the control unit for feeding information back to the control unit; the control unit is a PLC controller for controlling the temperature control box 5, a precision flow regulating valve 8, a T-valve 10, and the frequency converter 2 based on the information measured by the data acquisition unit.

[0038] The inverter is used to adjust the wind speed of the fan 1, the filter 3 is used to filter impurities in the air such as dust, water vapor, oil and other chemical substances in the air, the dry air flow meter 4 is used to measure the air flow rate drawn by the fan 1, the heater 6 is used to heat the air drawn by the fan, the temperature control box 5 is used to adjust the temperature of the air drawn by the fan by the heater 6, the humidifier 7 is used to humidify the air drawn by the fan, and the balance is used to monitor the quality change of the membrane.

[0039] like Figure 1-2 As shown, the specific connections of the proton exchange membrane fuel cell catalyst drying system are as follows:

[0040] The fan 1 is connected to the inlet of the filter 3 via a pipeline, and the fan is electrically connected to the frequency converter 2 to adjust the fan speed. The outlet of the filter 3 is connected to one end of the heating-side inlet pipeline, and the other end of the heating-side inlet pipeline is connected to the inlet of the heater 6. The heater 6 is electrically connected to the temperature control box 5 to control its heating temperature. The outlet of the heater 6 is connected to the inlet of the humidifier 7, and the outlet of the humidifier 7 is connected to the humidification-side outlet pipeline. The other end of the humidification-side outlet pipeline is connected to a Y-type tee 15, which then connects to the upper air inlet 31 and the lower air inlet 30 of the drying unit 14. A precision flow regulating valve 8, a steam flow meter 9, and a T-valve 10 are sequentially installed on the humidification-side outlet pipeline facing the Y-type tee 15. A dry air flow meter 4 is installed on the heating-side inlet pipeline.

[0041] like Figure 3-4As shown, the drying unit 14 includes an upper drying chamber 23 and a lower drying chamber 24 that are connected to each other. The lower drying chamber 24 is located at the bottom of the upper drying chamber 23, and both are formed by splicing five steel plates. Two hinges 29 are provided at the joint of the side walls of the upper drying chamber 23 and the lower drying chamber 24 to connect the two chambers, thereby enabling the drying unit 14 to be opened and closed. An air outlet 27 is provided at the top of the upper drying chamber 23 for exhausting air. An upper static pressure chamber 26 is provided inside the upper drying chamber 23, and three upper air inlets 25 are provided at the bottom of the upper static pressure chamber 26. An upper air inlet 31 is connected to the upper static pressure chamber 26. The lower drying chamber 24 is equipped with a support frame 18 and a lower static pressure chamber 19. A slide rail 17 is laid at the bottom of the lower drying chamber 24, and a support frame 18 is slidably connected to the slide rail 17. The slide rail is used to prevent the support frame 18 from colliding with the lower drying chamber when it moves. An upper support plate 22 is attached to the top of the support frame 18. The top surface of the upper support plate 22 is used to place a membrane coated with a catalyst layer, and the upper support plate 22 is located in the center of the drying unit 14. The lower static pressure chamber 19 is fixed on the side of the lower drying chamber 24 where the hinge 29 is installed. The top of the lower static pressure chamber has two downward air inlets 20. The downward air inlet 30 is connected to the lower static pressure chamber. Both the upper and lower air inlets 20 are provided with porous flow equalization plates 21. The porous flow equalization plates are arranged with a matrix of small circular holes for uniformly distributing the humid air used for drying. The upper air outlet 25 and the lower air outlet 20 are staggered and are both located on the same side wall of the upper drying chamber 23 and the lower drying chamber 24, and the distances between the upper air outlet 25 and the lower air outlet 20 and the upper support plate 22 are equal. A temperature sensor, a humidity sensor, and a wind speed sensor are respectively installed at the lower air outlet 20 and the upper air outlet 25.

[0042] An upper air inlet 31 and a lower air inlet 30 are respectively provided on the same side wall of the upper drying chamber 23 and the lower drying chamber 24, which are equipped with hinges 29. The upper air inlet 31 is located on the side of the upper drying chamber 23 where the hinges 29 are installed and corresponds to the location of the upper static pressure chamber 26; the lower air inlet 30 is located on the side wall of the lower drying chamber 24 and corresponds to the location of the lower static pressure chamber 19. Moreover, through grooves 28 are provided on both sides of the upper air inlet 31 and the lower air inlet 30, and bolts are provided on them. The tightening or loosening of the bolts controls the up and down movement of the upper static pressure chamber 26 and the lower static pressure chamber 19 along the groove holes of the through grooves 28.

[0043] A drying chamber support 13 is provided at the bottom of the lower drying chamber 24. A sliding device 11 is placed in the bottom space of the drying chamber support 13. The sliding device has two parallel electric lead screws, and a balance 12 is mounted on the lead screws and can slide along the lead screws. A lower base plate 16 is placed on the top of the balance 12. The lower base plate 16 has a through hole for inserting into the bottom of the support frame 18. The sliding device 11 drives the balance 12 to slide, thereby driving the lower base plate 16, the support frame 18 and the upper support plate 22 located on it to slide along the lead screws, and the support frame 18 slides along the slide rail 17.

[0044] like Figure 5 As shown, the working process of the proton exchange membrane fuel cell catalyst drying system is as follows:

[0045] Step 1: Control the rotation of the T-valve 10 to open the pipeline. The fan 1 draws in air. The temperature sensor, humidity sensor, and wind speed sensor at the lower air outlet 20 and upper air outlet 25 detect the temperature, humidity, and wind speed in real time and transmit them to the control unit. Simultaneously, the control unit records the currently measured temperature, humidity, and wind speed data. Then, the control unit controls the frequency converter 2 to adjust the wind speed entering the pipeline to 0-3 m / s. The air then enters the filter 3 for filtration. The filtered air then flows through the dry air flow meter 4 to measure the current air flow rate and sends it to the control unit. The air then enters the heater 6. The control unit, based on the lower air outlet 20 and upper air outlet 25, controls the flow rate of the air entering the pipeline. The temperature sensor at the air outlet 25 measures the temperature, which controls the temperature control box 5 to heat the air to 30-100℃ via the heater 6. The heated air enters the humidifier 7, increasing the humidity to 30%-100%, forming humid air. It then flows through the precision flow regulating valve 8. The control unit adjusts the opening of the valve based on the humidity measured by the humidity sensors at the lower air outlet 20 and the upper air outlet 25. Steam then flows through the steam flow meter 9 to count the steam flow. The humid air is divided into two paths by the Y-type tee 15, flowing into the upper drying chamber 23 and the lower drying chamber 24 of the drying unit 14 through the upper air inlet 31 and the lower air inlet 30, respectively, for drying. Part of the humid air enters the lower static pressure chamber 19 through the lower air inlet 30, then flows into the lower air outlet 20, and is blown out through the perforated flow equalization plate 21 at its top. The other part of the humid air enters the upper static pressure chamber 26 through the upper air inlet 31, then flows into the upper air outlet 25 and is blown out.

[0046] Step 2: Continue the above drying process until the measured temperature, humidity and wind speed data have an error of no more than 1% from the preset temperature, humidity and wind speed. Then close the T-valve 10 and shut down the fan 1, frequency converter 2, temperature control box 5 and precision flow regulating valve 8.

[0047] Step 3: Open the drying unit through the hinge 29, remove the upper tray 22 and the support frame 18, place the film to be dried on the upper tray 22, insert the support frame 18 into the through hole of the lower bottom plate 16, and then fasten the upper drying box and the lower drying box together to complete the insertion of the film.

[0048] Step 4: Open T-valve 10, record the measured temperature, humidity and wind speed data, and turn on inverter 2, temperature control box 5 and precision flow regulating valve 8 according to the working process of step 1. The humid air from the upper air outlet 25 and the lower air outlet 20 simultaneously dries the upper and lower surfaces of the membrane placed on the top surface of the upper support plate 22. During the drying process, the sliding device controls the balance to move back and forth along the screw to dry the membrane evenly. The drying time is 3-5 seconds.

[0049] Then immediately rotate the T-valve 10 to disconnect the pipeline, making the drying chamber airless and stopping the sliding device, so that the membrane inside the drying chamber is completely still, preventing the air flow inside the drying chamber from affecting the quality measurement.

[0050] Measure the weight using a balance 12 (the balance must have an accuracy of at least 0.01g);

[0051] Step 5: Return to Step 4 to continue the drying process, recording the measured temperature, humidity, and wind speed data. Repeat this process multiple times until the difference between the current weighing and the previous weighing is within 1%, at which point drying is complete. Close T-valve 10, stop all equipment, and plot the output temperature, humidity, and wind speed data as a mass change curve.

[0052] If there is no need to plot the quality change curve, the workflow is as follows:

[0053] Steps one through three are the same as those described above and will not be repeated here.

[0054] Step 4: Open T-valve 10, record the measured temperature, humidity and wind speed data, and turn on inverter 2, temperature control box 5 and precision flow regulating valve 8 according to the working process of step 1. The humid air from the upper air outlet 25 and the lower air outlet 20 simultaneously dries the upper and lower surfaces of the membrane placed on the top surface of the upper support plate 22. During the drying process, the sliding device controls the balance to move back and forth along the screw to dry the membrane evenly. The drying time is 3-5 minutes. Close T-valve 10, stop all equipment, and the drying is complete.

[0055] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention. Non-essential improvements, adjustments or substitutions made by those skilled in the art based on the content of this specification are all within the scope of protection claimed by the present invention.

Claims

1. A system for drying and measuring the catalyst layer of a proton exchange membrane fuel cell, characterized in that, The system includes a dry air generating unit, an air heating unit, a humid air generating unit, a drying unit, and a measuring unit, which are connected sequentially by pipelines, as well as a data acquisition unit and a control unit. The dry air generating unit is controlled by a frequency converter (2) to control the wind speed entering the system. The air heating unit is used to heat the air from the dry air generating unit, and its heating temperature is controlled by a temperature control box (5). The humid air generating unit is used to humidify the air from the air heating unit. The drying unit is equipped with a movable platform for placing the membrane to be dried, and an upper air outlet (25), a lower air outlet (20), an upper air inlet (31), and a lower air inlet (30) are respectively provided on the upper and lower surfaces of the movable platform. The measuring unit is detachably connected to the movable platform and is used to measure the dried membrane. The membrane is a membrane coated with a proton exchange membrane fuel cell catalyst layer; The data acquisition unit includes a dry air flow meter (4), a steam flow meter (9), a temperature sensor, a humidity sensor, and a wind speed sensor, and is connected to the control unit; the dry air flow meter (4) is located on the pipeline between the dry air generating unit and the air heating unit, and one end of a humidification side outlet pipeline is connected to the outlet of the humidified air generating unit, and the other end is connected to a Y-type tee (15), which is connected to the upper air inlet (31) and the lower air inlet (30) of the drying unit (14) respectively; and a precision flow regulating valve (8), a steam flow meter (9), and a T-type valve (10) are arranged sequentially on the humidification side outlet pipeline toward the Y-type tee (15); a temperature sensor, a humidity sensor, and a wind speed sensor are provided at the lower air outlet (20) and the upper air outlet (25) of the drying unit (14); The control unit is used to control the frequency converter (2), temperature control box (5), precision flow regulating valve (8) and T-valve (10), thereby realizing the regulation of system wind speed, temperature and humidity, as well as the measurement of membrane and the conversion of drying process; And plot the mass change curve based on the system temperature, humidity and wind speed monitored in real time by the data acquisition unit; while realistically simulating the drying process of the catalyst layer in actual production, adjust the drying conditions of the proton exchange membrane fuel cell catalyst layer, and continuously change its drying conditions according to the catalyst layer structure of the membrane electrode. The drying unit (14) includes an upper drying chamber (23) and a lower drying chamber (24) connected by hinges. The upper drying chamber (23) is provided with an upper static pressure chamber (26). One side of the upper static pressure chamber (26) is connected to an upper air inlet (31), and multiple upper air outlets (25) are opened at its bottom. The lower drying chamber (24) is provided with a lower static pressure chamber (19). One side of the lower static pressure chamber (19) is connected to a lower air inlet (30), and multiple lower air outlets (20) are opened at its top. The humid air generated by the humid air generating unit is diverted through a Y-shaped tee (15). Part of the humid air enters the lower static pressure chamber through the lower air inlet and is then blown out through the lower air outlets. The other part of the humid air enters the upper static pressure chamber through the upper air inlet and is then blown out through the upper air outlets. The upper air outlets (25) and lower air outlets (20) are staggered and their opening directions are opposite to each other and both face the membrane to be dried. The measuring unit is located below the drying unit (14) and includes a balance (12) and a sliding device (11). The balance is located on top of the sliding device and can slide horizontally along the sliding device. The top of the balance (12) is detachably connected to a support frame (18). The top of the support frame (18) has an upper support plate (22), on which the film to be dried is placed.

2. The proton exchange membrane fuel cell catalyst layer drying and measurement system according to claim 1, characterized in that, The lower air outlet (20) is connected to the lower static pressure chamber and a porous flow equalization plate (21) is provided on its top. The porous flow equalization plate (21) has uniformly distributed through holes.

3. The proton exchange membrane fuel cell catalyst layer drying and measurement system according to claim 1, characterized in that, Both sides of the upper air inlet (31) and the lower air inlet (30) have through grooves (28) with bolts on them. The upper static pressure chamber (26) and the lower static pressure chamber (19) can be moved up and down along the slots of the through grooves (28) by tightening or loosening the bolts.

4. The proton exchange membrane fuel cell catalyst layer drying and measurement system according to claim 1, characterized in that, The distances between the upper air outlet (25) and the lower air outlet (20) and the upper support plate (22) are equal.

5. The control method for the proton exchange membrane fuel cell catalyst layer drying and measurement system according to claim 1, characterized in that, Includes the following steps: Step 1: Control the T-valve (10) to rotate to open the pipeline, turn on the fan, control the frequency converter (2) to adjust the wind speed entering the pipeline, control the temperature control box (5) to adjust the air heating unit to heat the air temperature, the humid air generating unit increases the air humidity to 30%-100% to form humid air, and then the control unit controls the opening of the precision flow regulating valve (8) to control the humid air entering the drying unit. The humid air is split through the Y-type tee (15) and flows into the upper drying chamber (23) and lower drying chamber (24) of the drying unit (14) through the upper air inlet (31) and the lower air inlet (30) respectively. The data acquisition unit collects the current temperature, humidity and wind speed data and transmits them to the control unit. Step 2: Continue the above drying process until the measured temperature, humidity and wind speed data do not exceed the preset values. Then close the T-valve (10), fan (1), frequency converter (2), temperature control box (5) and precision flow regulating valve (8). Step 3: Place the membrane to be dried on the upper tray (22); Step 4: Open the T-valve (10), turn on the fan (1), and send air into the system; record the measured temperature, humidity and wind speed data, and turn on the frequency converter (2), temperature control box (5) and precision flow regulating valve (8) according to the working process of Step 1. The humid air entering the drying unit will dry the upper and lower surfaces of the membrane at the same time. During the drying process, the sliding device controls the balance to move back and forth to dry the membrane evenly. After the predetermined drying time, close the T-valve (10) to make the drying box windless and stop the sliding device from working; use the measuring unit to measure the current weight of the membrane. Step 5: When the preset measurement quality requirements are met, the drying process is completed and the membrane is removed; otherwise, return to step 4 to continue the drying process.

6. The control method according to claim 5, characterized in that, If it is not necessary to draw a quality change curve, the preset measurement quality requirement in step five is the drying time of 3-5 minutes in step four.

7. The control method according to claim 5, characterized in that, If a quality change curve needs to be plotted, the preset measurement quality requirements in step five are: The drying time for step four is 3-5 seconds; Repeat the drying process in step four, record the measured temperature, humidity and wind speed data until the difference between the current weight and the previous weight is within 1%, then the drying is complete; close the T-valve (10), stop all equipment, and plot the output temperature, humidity and wind speed data as a mass change curve.

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