Membrane electrode activation capacity grading detection sorting method and device

Abstract

The invention discloses a membrane electrode activation capacity grading detection sorting method and device, and the method comprises the following steps: S1, fixing a membrane electrode on an MEA clamp, and detecting the air tightness of the MEA clamp; s2, activating the membrane electrode, and testing voltage and current responses when different voltages and currents are applied; s3, processing the obtained response data, and drawing a polarization curve; s4, analyzing the polarization curve, and evaluating the comprehensive performance of the membrane electrode; and S5, determining the performance gradient of the membrane electrode according to an evaluation result, and realizing sorting of the membrane electrodes with the same performance gradient. Through automatic air tightness detection, activation process control, polarization curve drawing and analysis and a sorting process, the membrane electrodes can be divided into different performance gradients according to comprehensive performance indexes of the membrane electrodes, it is ensured that the membrane electrodes with the same performance gradient can form an electric pile, the whole detection and sorting process is optimized, and the detection efficiency is improved. And the performance and the consistency of the membrane electrode are improved, so that the overall performance and the stability of the galvanic pile are improved.

Description

Technical Field

[0001] The present invention relates to the field of membrane electrode testing technology, and in particular to a membrane electrode activation capacity detection and sorting method and device. Background Art

[0002] A fuel cell is a device that converts chemical energy generated by the electrochemical reaction between fuel and oxidant into electrical energy. The core component of the device is the membrane electrode assembly (MEA). As the core component of the fuel cell, the performance of the membrane electrode directly determines the overall efficiency and reliability of the fuel cell.

[0003] The membrane electrode is composed of a gas diffusion layer (GDL), a catalyst layer (CL) and a proton exchange membrane (PEM), and is a site for multiphase material transport and electrochemical reactions. Compared with the rapid oxidation of hydrogen at the anode, the high platinum loading of the cathode catalyst layer, the slow electrocatalytic kinetics of oxygen reduction and the difficulty of oxygen mass transfer have become key limiting factors in the cost, performance and life of the membrane electrode. At present, in the mass production process of membrane electrodes, the membrane electrodes are not activated before leaving the factory, and there is no sorting process. The activation of the membrane electrode is only in the activation and testing process of the stack, so it is difficult to improve the single-piece consistency of the entire stack.

[0004] Therefore, it is necessary to improve the deficiencies in the prior art to solve the above problems. Summary of the invention

[0005] The present invention overcomes the shortcomings of the prior art and provides a membrane electrode activation capacity detection and sorting method and device.

[0006] To achieve the above object, the technical solution adopted by the present invention is: a membrane electrode activation capacity detection and sorting method, comprising the following steps:

[0007] S1. Fix the membrane electrode on the MEA fixture, and introduce oxygen and hydrogen respectively to test the air tightness of the MEA fixture;

[0008] S2, activating the membrane electrode, and after stabilization, testing the voltage and current response of the membrane electrode under different voltages and currents;

[0009] S3, processing the response data obtained in step S2 and drawing a polarization curve;

[0010] S4. Analyze polarization curves to capture the electrocatalytic activity, mass transport limitation and internal resistance parameters of the membrane electrode, and evaluate the comprehensive performance of the membrane electrode;

[0011] S5. Determine the performance gradient of the membrane electrode based on the comprehensive performance evaluation results, and implement the sorting of membrane electrodes with the same performance gradient.

[0012] In a preferred embodiment of the present invention, in the step S1, the oxygen is introduced into the cathode of the membrane electrode, and the hydrogen is introduced into the anode of the membrane electrode.

[0013] In a preferred embodiment of the present invention, the step S2 includes the following sub-steps:

[0014] S21, activating the membrane electrode, including pre-activation, discharge activation or recovery activation;

[0015] S22, after the membrane electrode is activated and stabilized, a voltmeter and an ammeter are connected to the electrical interface of the membrane electrode, and different voltages and currents are gradually applied;

[0016] S23. Measure the voltage and current response of the membrane electrode under different applied voltages and currents.

[0017] In a preferred embodiment of the present invention, in step S23, the voltage and current responses include: open circuit voltage, short circuit current, and voltage-current characteristics under different loads.

[0018] In a preferred embodiment of the present invention, the step S3 includes the following sub-steps:

[0019] S31, arranging the applied current and voltage values ​​and their corresponding response voltage and current values ​​into a data table;

[0020] S32. Calculate the current density, plot the data points on the graph with the current density as the horizontal coordinate and the voltage as the vertical coordinate, and connect the data points to form a smooth curve to obtain the polarization curve.

[0021] In a preferred embodiment of the present invention, in step S4, the polarization curve is divided into an active polarization region, a concentration polarization region and an ohmic polarization region.

[0022] In a preferred embodiment of the present invention, the Tafel slope of the active polarization zone reflects the electrocatalytic activity, and its Tafel slope b a The calculation formula is: Among them, ΔE a is the voltage change in the active polarization region, Δlog 10 (j a ) is the logarithmic change of the current density j in the active polarization region;

[0023] The slope of the concentration polarization region reflects the mass transport limitation, and its concentration polarization resistance R c The calculation formula is: Among them, ΔE c is the voltage change in the concentration polarization region, Δj cis the change in current density j in the concentration polarization region;

[0024] The resistance of the ohmic polarization region reflects the resistance of electron and ion transmission inside the membrane electrode. Its ohmic resistance R ohm The calculation formula is: Among them, V OCV is the open circuit voltage, V low is the voltage at low current density, I low It is a low current density;

[0025] The calculation formula of the comprehensive performance of the membrane electrode is:

[0026] Among them, w a , w c and w ohm They are the weight factors of active polarization region, concentration polarization region and ohmic polarization region respectively.

[0027] In a preferred embodiment of the present invention, the weight factor calculation of the active polarization region, the concentration polarization region and the ohmic polarization region comprises the following steps:

[0028] A1. Obtain voltage data at different current densities through experiments and define V i is the voltage at a specific current density in the ith experiment, j is the current density, and n is the number of experiments;

[0029] A2. For each current density j, calculate the average voltage

[0030] A3. Evaluate the consistency of voltage and calculate the standard deviation σ of voltage at each current density.

[0031]

[0032] A4. According to the polarization curve, the current density range is divided into active polarization region, concentration polarization region and ohmic polarization region, and the definition of j a 、j c and j ohm are the current density ranges in the active polarization region, concentration polarization region, and ohmic polarization region, respectively. For each polarization region, the standard deviation of the voltage in the three regions is calculated;

[0033] Standard deviation of voltage in the active polarization region

[0034] Standard deviation of voltage in the concentration polarization region

[0035] Standard deviation of voltage in the ohmic polarization region

[0036] A5. Determine the weight by the standard deviation of voltage consistency in each region;

[0037]

[0038] The present invention provides a detection and sorting device for a membrane electrode activation capacity detection and sorting method, comprising: a material taking platform, a grabbing robot, an activation capacity detection device, a MEA fixture, and a plurality of sorting and conveying mechanisms;

[0039] The material taking platform is located at one side of the grabbing robot and is used to place the membrane electrode to be tested;

[0040] The grabbing robot is located on one side of the activation capacity separation detection device and the MEA fixture, and is used to clamp and transport the membrane electrode;

[0041] The activation and volume separation detection equipment is used to detect the air tightness of the MEA fixture, and to activate and separate the membrane electrode;

[0042] The MEA clamp is located at one side of the activation capacity separation detection device and is used to clamp the membrane electrode at the detection position of the activation capacity separation detection device;

[0043] The sorting and conveying mechanism is located on one side of the grasping robot and is used to transport and sort membrane electrodes with different performance gradients after capacity separation.

[0044] In a preferred embodiment of the present invention, the sorting and conveying mechanism includes in sequence: a discharge table, a conveyor belt and a stacking table; the discharge table is used to place membrane electrodes with different performance gradients after volume separation, the conveyor belt is used to transport and transfer the membrane electrodes after volume separation, and the stacking table is used to concentrate membrane electrodes with the same performance gradient.

[0045] The present invention solves the defects existing in the background technology and has the following beneficial effects:

[0046] (1) The present invention provides a membrane electrode activation capacity detection and sorting method, which greatly reduces the need for manual operation and improves test efficiency and accuracy through automated air tightness detection, activation process control, polarization curve drawing and analysis, and sorting process. At the same time, automated testing and analysis reduce human intervention and reduce human errors caused by improper operation or misjudgment. It can classify membrane electrodes into different performance gradients according to their comprehensive performance index, ensuring that membrane electrodes of the same performance gradient can form a stack, optimizing the entire detection and sorting process, improving the performance and consistency of the membrane electrode, and thus improving the overall performance and stability of the stack.

[0047] (2) In the present invention, by drawing and analyzing the polarization curve, key parameters such as the electrocatalytic activity, mass transfer limitation and internal resistance of the membrane electrode can be captured more accurately, thereby achieving a reliable evaluation of the comprehensive performance of the membrane electrode. The accuracy and consistency of the performance evaluation will help improve the overall performance and reliability of the fuel cell, reduce production costs, and thus accelerate the commercialization process of fuel cell technology.

[0048] (3) In the present invention, a membrane electrode activation capacity detection and sorting production line is formed by a material picking table, a grasping robot, an activation capacity detection device, an MEA fixture and a plurality of sorting and conveying mechanisms, which can realize the automated grasping, placement, analysis and transportation processes, greatly improving the efficiency of the production line, while reducing the damage and safety risks that may occur during manual handling, thereby achieving the differentiation of membrane electrode performance, combining membrane electrodes of the same level into a stack, and improving the single-chip consistency of the stack. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art are briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative work.

[0050] Figure 1 It is a flow chart of a membrane electrode activation capacity detection and sorting method according to a preferred embodiment of the present invention;

[0051] Figure 2 It is a schematic diagram of a production line of a membrane electrode activation capacity detection and sorting device according to a preferred embodiment of the present invention;

[0052] In the figure: 1. Material picking platform; 2. Grabbing robot; 3. Activation and capacity detection equipment; 4. MEA fixture; 5. Material unloading platform; 6. Conveyor belt; 7. Battery stack platform. DETAILED DESCRIPTION

[0053] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0054] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein. Therefore, the protection scope of the present invention is not limited to the specific embodiments disclosed below.

[0055] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood by specific circumstances.

[0056] like Figure 1 As shown, a membrane electrode activation capacity detection and sorting method comprises the following steps:

[0057] S1, fix the membrane electrode on the MEA fixture 4, and introduce oxygen and hydrogen respectively to detect the air tightness of the MEA fixture 4;

[0058] S2, activating the membrane electrode, and after stabilization, testing the voltage and current response of the membrane electrode under different voltages and currents;

[0059] S3, processing the response data obtained in step S2 and drawing a polarization curve;

[0060] S4. Analyze polarization curves to capture the electrocatalytic activity, mass transport limitation and internal resistance parameters of the membrane electrode, and evaluate the comprehensive performance of the membrane electrode;

[0061] S5. Determine the performance gradient of the membrane electrode based on the comprehensive performance evaluation results, and implement the sorting of membrane electrodes with the same performance gradient.

[0062] In some specific embodiments, in step S1, the direction of oxygen introduction is the cathode of the membrane electrode, and the direction of hydrogen introduction is the anode of the membrane electrode.

[0063] It should be noted that air tightness is the key to ensure that there is no gas leakage between the MEA fixture 4 and the membrane electrode. Through air tightness testing, it is ensured that no gas escapes from the leak, avoiding leakage in the MEA fixture 4 or the membrane electrode, which may lead to inaccurate subsequent test data.

[0064] In some specific embodiments, the step S2 includes the following sub-steps:

[0065] S21, activating the membrane electrode, including pre-activation, discharge activation or recovery activation;

[0066] S22, after the membrane electrode is activated and stabilized, a voltmeter and an ammeter are connected to the electrical interface of the membrane electrode, and different voltages and currents are gradually applied;

[0067] S23. Measure the voltage and current response of the membrane electrode under different applied voltages and currents.

[0068] It should be noted that in step S21, activation is preferably discharge activation, which is achieved through a specific current or voltage control method, including constant current discharge activation: allowing the MEA to reach an activated state through a constant current, and variable current discharge activation: using a variable current for discharge activation; in step S23, the voltage and current responses include: open circuit voltage, short circuit current, and voltage-current characteristics under different loads; which are used to evaluate the electrochemical activity of the membrane electrode.

[0069] In some specific implementations, the step S3 includes the following sub-steps:

[0070] S31, arranging the applied current and voltage values ​​and their corresponding response voltage and current values ​​into a data table;

[0071] S32. Calculate the current density, plot the data points on the graph with the current density as the horizontal coordinate and the voltage as the vertical coordinate, and connect the data points to form a smooth curve to obtain the polarization curve.

[0072] It should be noted that in step S32, the calculation formula of the current density j is: Where I is the current value and A is the active area of ​​the membrane electrode.

[0073] In some specific embodiments, in step S4, the polarization curve is divided into an active polarization zone, a concentration polarization zone and an ohmic polarization zone; by analyzing the active polarization zone, in the low current density region, the voltage decreases slowly with the increase of current density, mainly due to the activity of the electrocatalyst, and the slope of this region is small, indicating that the activity of the electrocatalyst is high, which is used to capture the evaluation of the electrocatalytic activity; by analyzing the concentration polarization zone, with the increase of current density, the voltage decreases faster, mainly due to the limited transport of reactants (such as oxygen and hydrogen) to the electrode surface, and the slope of this region is large, indicating that the mass transport limitation is large, which is used to capture the evaluation of the mass transport limitation; by analyzing the ohmic polarization zone, in the high current density region, the voltage drops sharply, mainly due to the resistance loss inside the battery, and the slope of this region is the largest, indicating that the internal resistance is high, which is used to capture the evaluation of the internal resistance parameters.

[0074] Specifically, the Tafel slope in the active polarization region reflects the electrocatalytic activity, and its Tafel slope b a The calculation formula is: Among them, ΔE a is the voltage change in the active polarization region, Δlog 10 (j a ) is the logarithmic change of the current density j in the active polarization region;

[0075] The slope of the concentration polarization region reflects the mass transport limitation, and its concentration polarization resistance R c The calculation formula is: Among them, ΔE c is the voltage change in the concentration polarization region, Δj c is the change in current density j in the concentration polarization region;

[0076] The resistance of the ohmic polarization region reflects the resistance to electron and ion transport within the membrane electrode. Its ohmic resistance R ohm The calculation formula is: Among them, V OCV is the open circuit voltage, V low is the voltage at low current density, I low It is a low current density;

[0077] The calculation formula of membrane electrode comprehensive performance is: Among them, w a , w c and w ohm They are the weight factors of active polarization region, concentration polarization region and ohmic polarization region respectively.

[0078] Furthermore, the weight factor calculation of the active polarization region, the concentration polarization region and the ohmic polarization region includes the following steps:

[0079] A1. Obtain voltage data at different current densities through experiments and define V i is the voltage at a specific current density in the ith experiment, j is the current density, and n is the number of experiments;

[0080] A2. For each current density j, calculate the average voltage

[0081] A3. Evaluate the consistency of voltage and calculate the standard deviation σ of voltage at each current density.

[0082]

[0083] A4. According to the polarization curve, the current density range is divided into active polarization region, concentration polarization region and ohmic polarization region, and the definition of j a 、j c and j ohm are the current density ranges in the active polarization region, concentration polarization region, and ohmic polarization region, respectively. For each polarization region, the standard deviation of the voltage in the three regions is calculated;

[0084] Standard deviation of voltage in the active polarization region

[0085] Standard deviation of voltage in the concentration polarization region

[0086] Standard deviation of voltage in the ohmic polarization region

[0087] A5. Determine the weight by the standard deviation of voltage consistency in each region;

[0088]

[0089]

[0090] In some specific embodiments, in step S5, the membrane electrode is divided into different performance gradients according to the index of its comprehensive performance P. The performance gradient of the membrane electrode can be confirmed based on a single performance value, or it can be confirmed based on multiple values ​​or ranges; for example, if P≥x, it is performance 1, and the membrane electrodes with the same performance 1 are uniformly sorted; if P<x, it is performance 2, and the membrane electrodes with the same performance 2 are uniformly sorted.

[0091] like Figure 2 As shown, a detection and sorting device for a membrane electrode activation capacity detection and sorting method comprises: a material taking platform 1, a grabbing robot 2, an activation capacity detection device 3, a MEA fixture 4 and a plurality of sorting and conveying mechanisms;

[0092] The material taking table 1 is located on one side of the grasping robot 2 and is used to place the membrane electrode to be tested;

[0093] The grabbing robot 2 is located on one side of the activation capacity separation detection device 3 and the MEA fixture 4, and is used to clamp and transport the membrane electrode;

[0094] The activation and volume separation detection device 3 is used to detect the air tightness of the MEA fixture 4, and to activate and separate the membrane electrode;

[0095] The MEA fixture 4 is located at one side of the activation and capacity separation detection device 3, and is used to clamp the membrane electrode at the detection position of the activation and capacity separation detection device 3;

[0096] The sorting and conveying mechanism is located on one side of the grasping robot 2 and is used to transport and sort membrane electrodes with different performance gradients after capacity separation.

[0097] In some specific embodiments, the sorting and conveying mechanism includes in sequence: a discharge table 5, a conveyor belt 6 and a stacking table 7; the discharge table 5 is used to place membrane electrodes with different performance gradients after volume separation, the conveyor belt 6 is used to transport and transfer the membrane electrodes after volume separation, and the stacking table 7 is used to concentrate membrane electrodes with the same performance gradient.

[0098] It should be noted that, the membrane electrode activation capacity detection and sorting production line is formed by the material picking platform 1, the grasping robot 2, the activation capacity detection equipment 3, the MEA fixture 4 and several sorting and conveying mechanisms. The membrane electrode to be detected on the top of the material picking platform 1 is clamped by the grasping robot 2, and is transported to the MEA fixture 4 on one side of the activation capacity detection equipment 3 for clamping. The air tightness of the MEA fixture 4 is detected through the oxygen inlet and outlet, and the hydrogen inlet and outlet gas pipes in the activation capacity detection equipment 3, and the relevant data of the membrane electrode is detected by the activation capacity detection equipment 3 to realize the activation and polarization curve drawing. After the performance gradient is determined and the data is logically transmitted to the grasping robot 2, the membrane electrodes with different performance gradients are placed on the top of the discharge table 5 in the corresponding sorting and conveying mechanism according to the transmitted data. The membrane electrodes are transported and transferred to the top of the stack table 7 by the conveyor belt 6 for centralized sorting of membrane electrodes with the same performance gradient, thereby realizing automated grasping, placement, analysis and transportation processes, greatly improving the efficiency of the production line, and reducing possible damage and safety risks during manual handling, thereby realizing the distinction of membrane electrode performance, and combining membrane electrodes of the same level into a stack, thereby improving the single-chip consistency of the stack.

[0099] The above is based on the ideal embodiment of the present invention. Through the above description, it is obvious to those skilled in the art that the present invention is not limited to the details of the above exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is limited by the attached claims rather than the above description, and it is intended to include all changes within the meaning and scope of the equivalent elements of the claims. Any figure mark in the claims should not be regarded as limiting the claims involved.

[0100] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A membrane electrode activation capacity detection and sorting method, characterized in that: The following steps are involved: S1. Fix the membrane electrode on the MEA fixture, and introduce oxygen and hydrogen respectively to test the air tightness of the MEA fixture; S2, activating the membrane electrode, and after stabilization, testing the voltage and current response of the membrane electrode under different voltages and currents; S3, processing the response data obtained in step S2 and drawing a polarization curve; S4. Analyze polarization curves to capture the electrocatalytic activity, mass transport limitation and internal resistance parameters of the membrane electrode, and evaluate the comprehensive performance of the membrane electrode; S5. Determine the performance gradient of the membrane electrode based on the comprehensive performance evaluation results, and implement the sorting of membrane electrodes with the same performance gradient.

2. A membrane electrode activation capacity detection and sorting method according to claim 1, characterized in that: In the step S1, the oxygen is introduced into the cathode of the membrane electrode, and the hydrogen is introduced into the anode of the membrane electrode.

3. A membrane electrode activation capacity detection and sorting method according to claim 1, characterized in that: The step S2 includes the following sub-steps: S21, activating the membrane electrode, including pre-activation, discharge activation or recovery activation; S22, after the membrane electrode is activated and stabilized, a voltmeter and an ammeter are connected to the electrical interface of the membrane electrode, and different voltages and currents are gradually applied; S23. Measure the voltage and current response of the membrane electrode under different applied voltages and currents.

4. A membrane electrode activation capacity detection and sorting method according to claim 2, characterized in that: In the step S23, the voltage and current responses include: open circuit voltage, short circuit current, and voltage-current characteristics under different loads.

5. A membrane electrode activation capacity detection and sorting method according to claim 1, characterized in that: The step S3 includes the following sub-steps: S31, arranging the applied current and voltage values ​​and their corresponding response voltage and current values ​​into a data table; S32. Calculate the current density, plot the data points on the graph with the current density as the horizontal coordinate and the voltage as the vertical coordinate, and connect the data points to form a smooth curve to obtain the polarization curve.

6. A membrane electrode activation capacity detection and sorting method according to claim 1, characterized in that: In the step S4, the polarization curve is divided into an active polarization region, a concentration polarization region and an ohmic polarization region.

7. A membrane electrode activation capacity detection and sorting method according to claim 6, characterized in that: The Tafel slope of the active polarization region reflects the electrocatalytic activity. a The calculation formula is: Where, ΔE a is the voltage change in the active polarization region, Δlog 10 (j a ) is the logarithmic change of the current density j in the active polarization region; The slope of the concentration polarization region reflects the mass transport limitation, and its concentration polarization resistance R c The calculation formula is: Where, ΔE c is the voltage change in the concentration polarization region, Δj c is the change in current density j in the concentration polarization region; The resistance of the ohmic polarization region reflects the resistance of electron and ion transmission inside the membrane electrode. Its ohmic resistance R ohm The calculation formula is: Among them, V OCV is the open circuit voltage, V low is the voltage at low current density, I low It is a low current density; The calculation formula of the comprehensive performance of the membrane electrode is: Among them, w a , w c and w ohm They are the weight factors of active polarization region, concentration polarization region and ohmic polarization region respectively.

8. A membrane electrode activation capacity detection and sorting method according to claim 7, characterized in that: The weight factor calculation of the active polarization region, the concentration polarization region and the ohmic polarization region comprises the following steps: A1. Obtain voltage data at different current densities through experiments and define V i is the voltage at a specific current density in the ith experiment, j is the current density, and n is the number of experiments; A2. For each current density j, calculate the average voltage A3. Evaluate the consistency of voltage and calculate the standard deviation σ of voltage at each current density. A4. According to the polarization curve, the current density range is divided into active polarization region, concentration polarization region and ohmic polarization region, and the definition of j a 、j c and j ohm are the current density ranges in the active polarization region, concentration polarization region, and ohmic polarization region, respectively. For each polarization region, the standard deviation of the voltage in the three regions is calculated; Standard deviation of voltage in the active polarization region Standard deviation of voltage in the concentration polarization region Standard deviation of voltage in the ohmic polarization region A5. Determine the weight by the standard deviation of voltage consistency in each region; 9. A detection and sorting device based on a membrane electrode activation capacity detection and sorting method according to any one of claims 1 to 8, characterized in that: include: Retrieving table, grabbing robot, activation and capacity detection equipment, MEA fixture and several sorting and conveying mechanisms; The material taking platform is located at one side of the grabbing robot and is used to place the membrane electrode to be tested; The grabbing robot is located on one side of the activation capacity separation detection device and the MEA fixture, and is used to clamp and transport the membrane electrode; The activation and volume separation detection equipment is used to detect the air tightness of the MEA fixture, and to activate and separate the membrane electrode; The MEA clamp is located at one side of the activation capacity separation detection device and is used to clamp the membrane electrode at the detection position of the activation capacity separation detection device; The sorting and conveying mechanism is located on one side of the grasping robot and is used to transport and sort membrane electrodes with different performance gradients after capacity separation.

10. The detection and sorting device of the membrane electrode activation capacity detection and sorting method according to claim 9, characterized in that: The sorting and conveying mechanism includes: a discharge table, a conveyor belt and a stacking table in sequence; the discharge table is used to place membrane electrodes with different performance gradients after volume separation, the conveyor belt is used to transport and transfer the membrane electrodes after volume separation, and the stacking table is used to concentrate membrane electrodes with the same performance gradient.

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