Performance degradation rate calculation method and device of proton exchange membrane, equipment and medium

Abstract

The invention provides a performance degradation rate calculation method, device and equipment of a proton exchange membrane and a medium, and the method comprises the following steps: measuring the initial vertical resistance of a to-be-tested proton exchange membrane in a membrane electrode by using a preset proton exchange membrane durability test device under vertical resistance test parameters; based on a preset anode and cathode relative humidity interval, performing dry-wet cycle on the proton exchange membrane to be tested by using hydrogen, and applying target current to the proton exchange membrane to be tested based on preset current density, and re-measuring the vertical resistance of the proton exchange membrane to be tested to obtain the final vertical resistance of the proton exchange membrane to be tested after a preset mechanical durability test ending condition is met, and obtaining the performance degradation rate of the proton exchange membrane to be tested according to the initial vertical resistance and the final vertical resistance. Therefore, the problem of long test period in the prior art is solved, and the test time is shortened by introducing the electric field in the dry-wet cycle process to aggravate the performance attenuation of the membrane electrode.

Description

Technical Field

[0001] This application relates to the field of fuel cell technology, and more specifically, to a method, apparatus, device, and medium for calculating the performance degradation rate of a proton exchange membrane in the field of proton exchange membranes. Background Technology

[0002] A fuel cell is a chemical device that directly converts the chemical energy of fuel into electrical energy. A fuel cell consists of multiple stacked cells, each including an anode plate, a membrane electrode assembly (MEA), and a cathode plate, with the MEA located between the anode and cathode plates. The proton exchange membrane (PEM) is one of the core components of the MEA, and its performance directly affects the ohmic loss, energy efficiency, and operating costs of the MEA. Furthermore, the mechanical stability of the PEM is a crucial factor influencing the lifespan of a proton exchange membrane fuel cell.

[0003] In related technologies, the mechanical durability testing method provided by the U.S. Department of Energy (DOE) is currently widely used to evaluate the lifespan of proton exchange membranes. Specifically, a single cell is subjected to dry and wet cycling at 80°C, and hydrogen permeability and short-circuit resistance are monitored.

[0004] However, the testing methods provided by the relevant technologies require 20,000 cycles of wet and dry testing, with each cycle taking 4 minutes, resulting in a total cycle time of approximately 56 days. Furthermore, the evaluation criteria for these technologies only include hydrogen permeation current and short-circuit resistance, and testing is only performed once every 24 hours, failing to provide real-time monitoring of the proton exchange membrane's condition. With the increasing number of proton exchange membrane products on the market, this time-consuming and cumbersome DOE testing method is becoming increasingly unsuitable for screening and evaluating proton exchange membrane lifespan, necessitating a solution. Summary of the Invention

[0005] This application provides a method, apparatus, equipment, and medium for calculating the performance degradation rate of a proton exchange membrane. This method can solve the problems of long testing cycles and the inability to monitor the state of the proton exchange membrane in real time in related technologies. By introducing an electric field during the dry-wet cycle, the influence of humidity on the proton exchange membrane is enhanced, which exacerbates the performance degradation of the membrane electrode and thus shortens the testing time.

[0006] Firstly, a method for calculating the performance degradation rate of a proton exchange membrane is provided, the method comprising:

[0007] Determine the vertical resistance test parameters for the proton exchange membrane to be tested;

[0008] Under the vertical resistance test parameters, the initial vertical resistance of the proton exchange membrane under test in the membrane electrode is determined using a preset proton exchange membrane durability test device.

[0009] Based on a preset relative humidity range between the anode and cathode, the proton exchange membrane under test is subjected to dry-wet cycling using hydrogen gas. Simultaneously, a target current is applied to the proton exchange membrane under test based on a preset current density. After the preset mechanical durability test termination conditions are met, the vertical resistance of the proton exchange membrane under test is re-measured to obtain the final vertical resistance of the proton exchange membrane under test. The performance degradation rate of the proton exchange membrane under test is obtained based on the initial vertical resistance and the final vertical resistance.

[0010] The above technical solution solves the problems of long testing cycles and inability to monitor the state of proton exchange membranes in real time. By introducing an electric field during the dry-wet cycle, the influence of humidity on the proton exchange membrane is enhanced, which accelerates the degradation of membrane electrode performance and thus shortens the testing time.

[0011] In conjunction with the first aspect, in some possible implementations, the step of determining the initial vertical resistance of the proton exchange membrane under test in the membrane electrode using a preset proton exchange membrane durability testing device under the vertical resistance test parameters includes:

[0012] Based on the preset proton exchange membrane durability testing device, the compression ratio of the membrane electrode is adjusted to the target compression ratio. Under the vertical resistance test parameters, multiple first currents are applied to the proton exchange membrane under test, and the voltage at each first current is collected.

[0013] The initial vertical resistance of the proton exchange membrane under test is obtained by fitting the plurality of first currents and the voltage corresponding to each first current.

[0014] By applying multiple first currents and acquiring the corresponding voltages, a more accurate initial vertical resistance value can be obtained using a fitting method. This improves the accuracy and reliability of resistance measurement and facilitates subsequent calculation of the performance degradation rate of the proton exchange membrane.

[0015] In combination with the first aspect and the above implementation methods, in some possible implementation methods, after performing dry-wet cycling on the proton exchange membrane under test using hydrogen gas based on the preset relative humidity range of the anode and cathode, and simultaneously applying a target current to the proton exchange membrane under test based on a preset current density, the method further includes:

[0016] The voltage change of the proton exchange membrane under test at each humidity level and the number of hydrogen circulation cycles during the dry-wet cycle of the proton exchange membrane under test are detected.

[0017] If the voltage change of the proton exchange membrane under test exceeds the preset standard value at any humidity, or if the number of hydrogen circulation cycles reaches the preset number, then the proton exchange membrane under test is determined to meet the preset mechanical durability test termination condition.

[0018] By using the above technical solution, the performance status of the proton exchange membrane can be evaluated in real time by accurately monitoring the voltage changes of the proton exchange membrane under different humidity conditions and the number of hydrogen cycles during the dry-wet cycle.

[0019] In combination with the first aspect and the above implementation methods, in some possible implementation methods, the step of re-measuring the vertical resistance of the proton exchange membrane under test after satisfying the preset mechanical durability test termination conditions to obtain the final vertical resistance of the proton exchange membrane under test includes:

[0020] Based on the preset proton exchange membrane durability testing device, under the vertical resistance test parameters, multiple second currents are applied to the proton exchange membrane under test, and the new voltage is collected when each second current is applied.

[0021] The final vertical resistance of the proton exchange membrane under test is obtained by fitting the plurality of second currents and the new voltage corresponding to each second current.

[0022] By applying multiple second currents and acquiring new voltages, the final vertical resistance is obtained through fitting, ensuring that the final vertical resistance of the proton exchange membrane can be accurately measured after the test is completed, thereby accurately calculating the performance degradation rate.

[0023] In combination with the first aspect and the above implementation methods, in some possible implementation methods, before determining the vertical resistance test parameters of the proton exchange membrane to be tested, the following steps are also included:

[0024] Based on the target compression ratio, the resistance of the preset proton exchange membrane durability testing device is tested;

[0025] The actual resistance of the proton exchange membrane under test is obtained by the difference between the initial vertical resistance and the resistance of the preset proton exchange membrane durability testing device.

[0026] Through the above technical solutions, the resistance of the proton exchange membrane directly affects the efficiency and performance of the fuel cell. By measuring the actual resistance of the proton exchange membrane, the overall performance of the battery and potential performance bottlenecks can be evaluated.

[0027] In combination with the first aspect and the above implementation methods, in some possible implementation methods, obtaining the performance degradation rate of the proton exchange membrane under test based on the initial vertical resistance and the final vertical resistance includes:

[0028] Calculate the absolute value of the difference between the final vertical resistance and the initial vertical resistance;

[0029] The performance degradation rate of the proton exchange membrane under test is obtained by the ratio of the absolute value of the difference to the initial vertical resistance.

[0030] The above technical solution provides a specific formula for calculating the performance degradation rate. This calculation method is intuitive and easy to implement, and can directly reflect the performance changes of the proton exchange membrane during the test process.

[0031] In combination with the first aspect and the above implementation methods, in some possible implementation methods, the vertical resistance test parameters include at least one of battery temperature, pipeline temperature, anode and cathode relative humidity, anode and cathode gas pressure, and hydrogen flow rate.

[0032] Through the above technical solution, the vertical resistance test parameters can include multiple aspects such as battery temperature, pipeline temperature, relative humidity of the anode and cathode, gas pressure of the anode and cathode, and hydrogen flow rate, so that the test method can more comprehensively consider the performance of the proton exchange membrane under different working environments, and improve the applicability and practicality of the test.

[0033] According to the method for calculating the performance degradation rate of a proton exchange membrane (PEM) provided in this application, under the vertical resistance test parameters of the PEM under test, the initial vertical resistance of the PEM under test in the membrane electrode is measured using a preset PEM durability test device. Based on a preset relative humidity range between the anode and cathode, the PEM under test is subjected to a dry-wet cycle using hydrogen gas. Simultaneously, a target current is applied to the PEM under test based on a preset current density. After meeting the preset mechanical durability test termination conditions, the vertical resistance of the PEM under test is re-measured to obtain the final vertical resistance of the PEM under test. The performance degradation rate of the PEM under test is obtained based on the initial vertical resistance and the final vertical resistance. This solves the problems of long test cycles and the inability to monitor the state of the PEM in real time in related technologies. By introducing an electric field during the dry-wet cycle, the influence of humidity on the PEM is enhanced, accelerating the performance degradation of the membrane electrode and thus shortening the test time.

[0034] Secondly, a device for calculating the performance degradation rate of a proton exchange membrane is provided, the device comprising:

[0035] The determination module is used to determine the vertical resistance test parameters of the proton exchange membrane to be tested;

[0036] The measurement module is used to measure the initial vertical resistance of the proton exchange membrane under test in the membrane electrode using a preset proton exchange membrane durability test device under the vertical resistance test parameters.

[0037] The testing and calculation module is used to perform dry and wet cycling on the proton exchange membrane under test using hydrogen gas based on a preset relative humidity range between the anode and cathode. At the same time, a target current is applied to the proton exchange membrane under test based on a preset current density. After the preset mechanical durability test termination condition is met, the vertical resistance of the proton exchange membrane under test is re-measured to obtain the final vertical resistance of the proton exchange membrane under test. The performance degradation rate of the proton exchange membrane under test is obtained based on the initial vertical resistance and the final vertical resistance.

[0038] In conjunction with the second aspect, in some possible implementations, the measuring module is used for:

[0039] Based on the preset proton exchange membrane durability testing device, the compression ratio of the membrane electrode is adjusted to the target compression ratio. Under the vertical resistance test parameters, multiple first currents are applied to the proton exchange membrane under test, and the voltage at each first current is collected.

[0040] The initial vertical resistance of the proton exchange membrane under test is obtained by fitting the plurality of first currents and the voltage corresponding to each first current.

[0041] In conjunction with the second aspect and the above implementation methods, in some possible implementation methods, after performing dry-wet cycling on the proton exchange membrane under test using hydrogen gas based on the preset relative humidity range between the anode and cathode, and simultaneously applying a target current to the proton exchange membrane under test based on a preset current density, the test and calculation module is further used for:

[0042] The voltage change of the proton exchange membrane under test at each humidity level and the number of hydrogen circulation cycles during the dry-wet cycle of the proton exchange membrane under test are detected.

[0043] If the voltage change of the proton exchange membrane under test exceeds the preset standard value at any humidity, or if the number of hydrogen circulation cycles reaches the preset number, then the proton exchange membrane under test is determined to meet the preset mechanical durability test termination condition.

[0044] In combination with the second aspect and the above implementation methods, in some possible implementations, the testing and calculation module is used for:

[0045] Based on the preset proton exchange membrane durability testing device, under the vertical resistance test parameters, multiple second currents are applied to the proton exchange membrane under test, and the new voltage is collected when each second current is applied.

[0046] The final vertical resistance of the proton exchange membrane under test is obtained by fitting the plurality of second currents and the new voltage corresponding to each second current.

[0047] In conjunction with the second aspect and the above implementation methods, in some possible implementations, before determining the vertical resistance test parameters of the proton exchange membrane to be tested, the test and calculation module is further configured to:

[0048] Based on the target compression ratio, the resistance of the preset proton exchange membrane durability testing device is tested;

[0049] The actual resistance of the proton exchange membrane under test is obtained by the difference between the initial vertical resistance and the resistance of the preset proton exchange membrane durability testing device.

[0050] In combination with the second aspect and the above implementation methods, in some possible implementations, the testing and calculation module is used for:

[0051] Calculate the absolute value of the difference between the final vertical resistance and the initial vertical resistance;

[0052] The performance degradation rate of the proton exchange membrane under test is obtained by the ratio of the absolute value of the difference to the initial vertical resistance.

[0053] In combination with the second aspect and the above implementation methods, in some possible implementation methods, the vertical resistance test parameters include at least one of battery temperature, pipeline temperature, relative humidity of the anode and cathode, gas pressure of the anode and cathode, and hydrogen flow rate.

[0054] According to the performance degradation rate calculation device for proton exchange membranes provided in this application embodiment, under the vertical resistance test parameters of the proton exchange membrane under test, the initial vertical resistance of the proton exchange membrane under test in the membrane electrode is determined using a preset proton exchange membrane durability test device. Based on a preset relative humidity range between the anode and cathode, the proton exchange membrane under test is subjected to dry-wet cycling using hydrogen gas. Simultaneously, a target current is applied to the proton exchange membrane under test based on a preset current density. After meeting the preset mechanical durability test termination conditions, the vertical resistance of the proton exchange membrane under test is re-measured to obtain the final vertical resistance of the proton exchange membrane under test. The performance degradation rate of the proton exchange membrane under test is obtained based on the initial vertical resistance and the final vertical resistance. This solves the problems of long test cycles and the inability to monitor the state of the proton exchange membrane in real time in related technologies. By introducing an electric field during the dry-wet cycling process, the influence of humidity on the proton exchange membrane is enhanced, accelerating the performance degradation of the membrane electrode and thus shortening the test time.

[0055] Thirdly, an electronic device is provided, comprising: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the method for calculating the performance degradation rate of a proton exchange membrane as described in the above embodiments.

[0056] Fourthly, a computer-readable storage medium is provided, which stores computer program code that, when executed on a computer, causes the computer to perform the proton exchange membrane performance degradation rate calculation method in the first aspect or any possible implementation thereof. Attached Figure Description

[0057] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the following description of the embodiments taken in conjunction with the accompanying drawings, wherein:

[0058] Figure 1 This is a flowchart illustrating a method for calculating the performance degradation rate of a proton exchange membrane according to an embodiment of this application.

[0059] Figure 2 This is a schematic diagram of a pre-designed proton exchange membrane durability testing device according to an embodiment of this application;

[0060] Figure 3 This is a schematic diagram of the impedance of a proton exchange membrane under different humidity levels according to an embodiment of this application.

[0061] Figure 4 This is a block diagram of a proton exchange membrane performance degradation rate calculation device according to an embodiment of this application;

[0062] Figure 5 This is a schematic diagram of the structure of an electronic device provided in an embodiment of this application.

[0063] Reference numerals: 210-Hydrogen circulation pipeline, 211-Membrane electrode, 212-Test fixture, 213-Mass flow meter, 214-Three-way valve, 215-Humidifier, 216-Pipeline, 217-Hydrogen cylinder, 218-Dryer, 220-Current component, 221-DC power supply, 222-Wire; 10-Proton exchange membrane performance decay rate calculation device, 100-Determination module, 200-Measurement module, 300-Test and calculation module; 501-Memory, 502-Processor, 503-Communication interface. Detailed Implementation

[0064] The technical solutions in this application will be clearly and thoroughly described below with reference to the accompanying drawings. In the description of the embodiments of this application, unless otherwise stated, " / " means "or," for example, A / B can mean A or B. "And / or" in the text is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Furthermore, in the description of the embodiments of this application, "multiple" refers to two or more than two.

[0065] Hereinafter, the terms "first" and "second" are used for descriptive purposes only and should not be construed as implying or suggesting relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature.

[0066] The following description, with reference to the accompanying drawings, outlines a method, apparatus, device, and medium for calculating the performance degradation rate of a proton exchange membrane (PEM) according to embodiments of this application. Addressing the issues of long testing cycles and the inability to monitor the PEM's state in real time, as mentioned in the background art, this application provides a method for calculating the performance degradation rate of a PEM. In this method, under the vertical resistance test parameters of the PEM under test, the initial vertical resistance of the PEM in the membrane electrode is measured using a preset PEM durability testing device. Based on a preset relative humidity range between the anode and cathode, the PEM under test is subjected to a dry-wet cycle using hydrogen gas. Simultaneously, a target current is applied to the PEM based on a preset current density. After satisfying the preset mechanical durability test termination conditions, the vertical resistance of the PEM under test is re-measured to obtain the final vertical resistance. The performance degradation rate of the PEM is then obtained based on the initial and final vertical resistances. This solves the problems of long testing cycles and the inability to monitor the PEM's state in real time in related technologies. By introducing an electric field during the dry-wet cycle, the influence of humidity on the PEM is enhanced, accelerating the performance degradation of the membrane electrode and thus shortening the testing time.

[0067] Specifically, Figure 1 This is a flowchart illustrating a method for calculating the performance degradation rate of a proton exchange membrane, as provided in an embodiment of this application.

[0068] like Figure 1 As shown, the method for calculating the performance degradation rate of the proton exchange membrane includes the following steps:

[0069] In step S101, the vertical resistance test parameters of the proton exchange membrane to be tested are determined.

[0070] The vertical resistance is the resistance perpendicular to the direction of the proton exchange membrane.

[0071] Furthermore, in some embodiments, the vertical resistance test parameters for the proton exchange membrane under test include at least one of the following: battery temperature, pipeline temperature, relative humidity of the cathode and anode, gas pressure of the cathode and anode, and hydrogen flow rate. Here, relative humidity of the cathode and anode refers to the relative humidity between the cathode and anode, and gas pressure of the cathode and anode refers to the gas pressure between the cathode and anode.

[0072] In step S102, under the vertical resistance test parameters, the initial vertical resistance of the proton exchange membrane under test in the membrane electrode is determined using a preset proton exchange membrane durability test device.

[0073] In some embodiments, such as Figure 2 As shown, the pre-designed proton exchange membrane durability testing device includes a hydrogen circulation pipeline 210 and a current component 220 for applying current to the proton exchange membrane under test. The hydrogen circulation pipeline 210 includes a membrane electrode 211, a test fixture 212, a mass flow meter 213, a three-way valve 214, a humidifier 215, a pipeline 216, a hydrogen cylinder 217, and a dryer 218. The current component 220 includes a DC power supply 221 and wires 222. Figure 2 In this process, hydrogen enters the anode and cathode of the battery through a humidifier, and the total amount of hydrogen at the outlet remains unchanged. After drying, it can be recycled, thus reducing the amount of hydrogen used and lowering the testing cost.

[0074] Furthermore, in some embodiments, under vertical resistance test parameters, the initial vertical resistance of the proton exchange membrane under test in the membrane electrode is determined using a preset proton exchange membrane durability test device, including: adjusting the compression ratio of the membrane electrode to a target compression ratio based on the preset proton exchange membrane durability test device; applying multiple first currents to the proton exchange membrane under test under vertical resistance test parameters, and collecting the voltage when each first current is applied; and fitting the initial vertical resistance of the proton exchange membrane under test based on the multiple first currents and the voltage corresponding to each first current.

[0075] The first current can be a direct current.

[0076] Optionally, those skilled in the art can adjust the vertical resistance test parameters according to specific actual conditions. For example, the vertical resistance test parameters in this application embodiment can be: battery temperature between 70-90°C, pipeline temperature 10°C higher than battery temperature, hydrogen flow rate and back pressure between 150-260 kPa, hydrogen flow rate at the anode and cathode being the same and controlled between 1.0-2.5 NLPM, and relative humidity at the anode and cathode being 30% or 50%, without specific limitations.

[0077] Specifically, the membrane electrode to be tested is first fabricated based on the sample containing the proton exchange membrane to be tested. In addition, in order to reduce the influence of the catalyst layer on the durability test, the embodiments of this application may use a high-loading, high-durability catalyst to fabricate the cathode catalyst layer and the anode catalyst layer of the membrane electrode.

[0078] Furthermore, before testing, the prefabricated membrane electrode (containing no proton exchange membrane) is controlled at a certain compression ratio, which is used as the target compression ratio for the membrane electrode during testing. The membrane electrode to be tested is installed into the test fixture 202 of the pre-set proton exchange membrane durability testing device, and the compression ratio of the gas diffusion layer (GDL) of the membrane electrode to be tested is controlled to approach the target compression ratio, i.e., to keep the gas diffusion layer compression ratio of the membrane electrode to be tested as consistent as possible with the target compression ratio. After passing the airtightness test, the membrane electrode to be tested is activated using existing activation methods, such as high-potential activation and hydrogen pump activation. After the membrane electrode to be tested is activated, the various pipelines of the proton exchange membrane durability testing device are connected according to... Figure 2 Make the connections and ensure there are no leaks in the pipes.

[0079] Furthermore, based on a pre-set proton exchange membrane durability testing device, vertical resistance test parameters such as battery temperature, pipeline temperature, relative humidity between cathode and anode, hydrogen flow rate between cathode and anode, and anode and cathode pressure are set according to a specific temperature and humidity. After the vertical resistance test parameters stabilize for a period of time, multiple first currents are applied to the electrode of the membrane to be tested, and the corresponding voltage is measured when each first current is applied. Using the fitting strategy in the prior art, a voltage-current curve is fitted based on the multiple first currents and the voltage corresponding to each first current to obtain the initial vertical resistance of the proton exchange membrane to be tested.

[0080] In step S103, based on the preset relative humidity range of the anode and cathode, the proton exchange membrane under test is subjected to dry and wet cycles using hydrogen gas. At the same time, a target current is applied to the proton exchange membrane under test based on a preset current density. After the preset mechanical durability test termination condition is met, the vertical resistance of the proton exchange membrane under test is re-measured to obtain the final vertical resistance of the proton exchange membrane under test. The performance degradation rate of the proton exchange membrane under test is obtained based on the initial vertical resistance and the final vertical resistance.

[0081] Optionally, the preset relative humidity range for the anode and cathode can be 0% to 120%, and the preset current density can be 0.3 A / cm². 2 No specific limitations are specified here.

[0082] Specifically, this embodiment controls the relative humidity of the anode and cathode to alternate within a preset relative humidity range. Hydrogen gas is used to perform a dry-wet cycle on the proton exchange membrane under test, periodically changing the moisture content in the hydrogen gas flow. This causes the proton exchange membrane to undergo a process from dry to humid and then back to dry, simulating the actual working environment. Furthermore, a preset current density (e.g., 0.5 A / cm²) is used. 2 Apply the target current to the proton exchange membrane to be tested and determine whether the preset mechanical durability test termination conditions are met.

[0083] Furthermore, if the preset mechanical durability test termination conditions are met, such as completing 1000 dry and wet cycles or other preset mechanical durability test termination conditions, the vertical resistance of the proton exchange membrane under test is re-measured to obtain the final vertical resistance of the proton exchange membrane under test, and the performance degradation rate of the proton exchange membrane under test is obtained based on the initial vertical resistance and the final vertical resistance.

[0084] Furthermore, in some embodiments, after performing dry-wet cycling on the proton exchange membrane under test using hydrogen gas within a preset relative humidity range between the anode and cathode, and simultaneously applying a target current to the proton exchange membrane under test based on a preset current density, the method further includes: detecting the voltage change value of the proton exchange membrane under test at each humidity level and the number of hydrogen gas cycles during the dry-wet cycling of the proton exchange membrane under test; if the voltage change value of the proton exchange membrane under test at any humidity level exceeds a preset standard value, or the number of hydrogen gas cycles reaches a preset number, then it is determined that the proton exchange membrane under test meets the preset mechanical durability test termination conditions.

[0085] Optionally, the preset standard value can be a standard value set in advance by those skilled in the art, and the preset number of laps can be the number of laps obtained through a limited number of experiments or computer simulations. For example, the preset number of laps can be 20,000 laps, and no specific limitation is made here.

[0086] Specifically, within a preset relative humidity range between the anode and cathode, hydrogen gas is used to perform dry-wet cycling on the proton exchange membrane under test. Simultaneously, a target current is applied to the proton exchange membrane under test based on a preset current density. The relative humidity between the anode and cathode is controlled to alternate between the relative humidity ranges. The voltage change value of the membrane electrode under test at each humidity level is detected in real time by a current detection device. If the voltage change value of the membrane electrode under test at any humidity level exceeds the preset standard value (e.g., the voltage change value exceeds 0.05V at 30% RH), or the preset number of hydrogen cycles of the proton exchange membrane durability test device is reached, then the proton exchange membrane under test is determined to meet the preset mechanical durability test termination conditions, and the mechanical durability test of the proton exchange membrane under test is terminated.

[0087] For example, in the mechanical durability test of this application, the dry and wet state holding time can be 1-3 minutes, and the dry and wet cycle setting standard can be a voltage reduction of 50% at 120% humidity, which is not specifically limited here. During the dry and wet cycle, the short-circuit resistance and hydrogen permeation current of the membrane electrode under test can also be detected at regular intervals. When the hydrogen permeation current is greater than 15mA / cm 2 Or the short-circuit resistance is less than 1000Ω*cm 2 If the test result is positive, the proton exchange membrane under test is determined to meet the preset mechanical durability test termination conditions, and the mechanical durability test of the proton exchange membrane under test is stopped.

[0088] Furthermore, in some embodiments, after satisfying the preset mechanical durability test termination conditions, the vertical resistance of the proton exchange membrane under test is re-measured to obtain the final vertical resistance of the proton exchange membrane under test, including: based on a preset proton exchange membrane durability test device, under vertical resistance test parameters, applying multiple second currents to the proton exchange membrane under test respectively, and collecting the new voltage when each second current is applied; and fitting the multiple second currents and the new voltage corresponding to each second current to obtain the final vertical resistance of the proton exchange membrane under test.

[0089] The second current can be a direct current.

[0090] Specifically, the method for determining the final vertical resistance of the proton exchange membrane under test in this embodiment is similar to the method for determining the initial vertical resistance of the proton exchange membrane under test in the membrane electrode described above. Based on a preset proton exchange membrane durability testing device, vertical resistance test parameters such as battery temperature, pipeline temperature, anode and cathode relative humidity, anode and cathode hydrogen flow rate, and back pressure are set according to a specific temperature and humidity. After the vertical resistance test parameters have stabilized for a period of time, multiple second currents are applied to the membrane electrode under test, and the corresponding new voltage is measured when each second current is applied. Using the fitting strategy in the prior art, a new voltage-current curve is fitted according to the multiple second currents and the new voltage corresponding to each second current to obtain the final vertical resistance of the proton exchange membrane under test.

[0091] Furthermore, in some embodiments, obtaining the performance degradation rate of the proton exchange membrane under test based on the initial vertical resistance and the final vertical resistance includes: calculating the absolute value of the difference between the final vertical resistance and the initial vertical resistance; and obtaining the performance degradation rate of the proton exchange membrane under test based on the ratio of the absolute value of the difference to the initial vertical resistance.

[0092] Specifically, to facilitate understanding by those skilled in the art of calculating the performance degradation rate of the proton exchange membrane under test in the embodiments of this application, the performance degradation rate of the proton exchange membrane under test is expressed as:

[0093] α=|R M1 -R M0 | / R M0

[0094] Where α is the performance degradation rate of the proton exchange membrane under test, and R M1 R represents the final vertical resistance of the proton exchange membrane to be tested. M0 The initial vertical resistance is given by the value of the proton exchange membrane to be tested.

[0095] For example, suppose the initial vertical resistance is 0.02 Ω·cm 2 The final vertical resistance is 0.03 Ω·cm. 2Then the performance degradation rate is |0.03-0.02| / 0.02=0.5.

[0096] Therefore, this invention employs the hydrogen pump method to evaluate the mechanical durability of proton exchange membranes, adding a new evaluation standard and thus shortening the testing time. Compared to the US DOE standard scheme, this method introduces an electric field during the dry-wet cycle, enabling the directional movement of hydrogen protons within the membrane, which better reflects the state of the proton exchange membrane under real-world operating conditions. By real-time detection of the weak voltage across the membrane electrodes, the mechanical degradation of the proton exchange membrane can be monitored.

[0097] Specifically, because hydrogen molecules are smaller than air (nitrogen and oxygen), they are easier to dry or humidify the proton exchange membrane. Therefore, this application uses hydrogen as a carrier gas to replace air in the mechanical durability testing of the proton exchange membrane. A constant current is applied to the membrane electrode, increasing the anodic potential. This causes the hydrogen to oxidize, and the resulting protons are reduced back to hydrogen at the cathode through the proton exchange membrane. The electric field applied across the proton exchange membrane alters the orientation of the perfluorosulfonic acid resin within the membrane, thereby accelerating the degradation of the membrane electrode performance.

[0098] Furthermore, in some embodiments, before determining the vertical resistance test parameters of the proton exchange membrane to be tested, the method further includes: testing the resistance of a preset proton exchange membrane durability testing device based on the target compression ratio; and obtaining the actual resistance of the proton exchange membrane to be tested based on the difference between the initial vertical resistance and the resistance of the preset proton exchange membrane durability testing device.

[0099] Specifically, a pre-fabricated membrane electrode is installed on the test fixture 202 of the pre-set proton exchange membrane durability testing device. The pre-fabricated membrane electrode is a proton exchange membrane without a catalytic layer, but only has a GDL (Gas Diffusion Layer) and an MPL (Micro-Porous Layer). After the pre-fabricated membrane electrode is installed, it is compressed using the pre-set proton exchange membrane durability testing device based on the target compression ratio.

[0100] Furthermore, without releasing gas, multiple currents are sequentially applied to the pre-fabricated membrane electrode based on a preset current density, and the voltage value corresponding to each current density is measured. Using a fitting strategy in the prior art, a voltage-current curve is fitted based on multiple current densities and the voltage value at each current density to obtain the preset resistance of the proton exchange membrane durability test device.

[0101] It should be noted that the preset current density in this embodiment should be lower than 1 A / cm². 2 The resistance of the pre-set proton exchange membrane durability test device is the slope of the voltage-current curve.

[0102] It is understood that the actual resistance of the proton exchange membrane directly affects the efficiency and performance of the fuel cell. Therefore, in this embodiment, the actual resistance of the proton exchange membrane under test is calculated based on the initial vertical resistance and the resistance of the preset proton exchange membrane durability test device, thereby enabling the evaluation of the overall performance of the battery and possible performance bottlenecks.

[0103] Specifically, the difference between the initial vertical resistance and the resistance of the preset proton exchange membrane durability testing device is calculated to obtain the actual resistance of the proton exchange membrane under test. For example, assume the initial vertical resistance is 0.02 Ω·cm. 2 The resistance of the pre-set proton exchange membrane durability test device is 0.005 Ω·cm. 2 Therefore, the actual resistance of the proton exchange membrane under test is 0.015 Ω·cm. 2 .

[0104] To facilitate understanding of the proton exchange membrane durability test results of this application by those skilled in the art, the following is in conjunction with... Figure 3 Please provide an explanation.

[0105] like Figure 3 As shown, since the vertical resistance of the proton exchange membrane is highly sensitive to humidity and has good reproducibility, the proton exchange membrane durability test in this embodiment was conducted at a battery temperature of 80°C, a hydrogen flow rate of 1.5 NLPM at the anode and cathode, and a hydrogen back pressure of 250 kPa to measure the change in the vertical resistance of the proton exchange membrane with humidity. The test results show that the resistance is within acceptable limits even with a current density of less than 0.5 A / cm². 2 At different humidity levels, the vertical resistance of the proton exchange membrane is different. Under the same humidity, the voltage increases linearly with the current, while the vertical resistance remains unchanged.

[0106] According to the method for calculating the performance degradation rate of a proton exchange membrane (PEM) proposed in this application, under the vertical resistance test parameters of the PEM under test, the initial vertical resistance of the PEM in the membrane electrode is measured using a preset PEM durability test device. Based on a preset relative humidity range between the anode and cathode, the PEM under test is subjected to a dry-wet cycle using hydrogen gas. Simultaneously, a target current is applied to the PEM based on a preset current density. After meeting the preset mechanical durability test termination conditions, the vertical resistance of the PEM under test is re-measured to obtain the final vertical resistance. The performance degradation rate of the PEM is then obtained based on the initial and final vertical resistances. This method solves the problems of long test cycles and the inability to monitor the state of the PEM in real time in related technologies. By introducing an electric field during the dry-wet cycle, the influence of humidity on the PEM is enhanced, accelerating the performance degradation of the membrane electrode and thus shortening the test time.

[0107] Next, with reference to the accompanying drawings, a device for calculating the performance degradation rate of a proton exchange membrane according to an embodiment of this application is described.

[0108] Figure 4 This is a block diagram of a proton exchange membrane performance degradation rate calculation device according to an embodiment of this application.

[0109] like Figure 4 As shown, the proton exchange membrane performance degradation rate calculation device 10 includes: a determination module 100, a measurement module 200, and a test and calculation module 300.

[0110] The test module 100 is used to determine the vertical resistance test parameters of the proton exchange membrane under test; the measurement module 200 is used to measure the initial vertical resistance of the proton exchange membrane under test in the membrane electrode using a preset proton exchange membrane durability test device under the vertical resistance test parameters, wherein the preset proton exchange membrane durability test device includes a hydrogen circulation pipeline and a current component for applying current to the proton exchange membrane under test; the test and calculation module 300 is used to perform dry and wet cycling of the proton exchange membrane under test using hydrogen based on a preset relative humidity range between the anode and cathode, and simultaneously apply a target current to the proton exchange membrane under test based on a preset current density, and re-measure the vertical resistance of the proton exchange membrane under test after meeting the preset mechanical durability test termination conditions to obtain the final vertical resistance of the proton exchange membrane under test, and obtain the performance degradation rate of the proton exchange membrane under test based on the initial vertical resistance and the final vertical resistance.

[0111] Furthermore, in some embodiments, the measurement module 200 is used to: adjust the compression ratio of the membrane electrode to a target compression ratio based on a preset proton exchange membrane durability testing device; apply multiple first currents to the proton exchange membrane to be tested under vertical resistance test parameters, and collect the voltage when each first current is applied; and obtain the initial vertical resistance of the proton exchange membrane to be tested by fitting the multiple first currents and the voltage corresponding to each first current.

[0112] Furthermore, in some embodiments, after the proton exchange membrane under test is subjected to dry-wet cycling using hydrogen gas within a preset relative humidity range between the anode and cathode, and a target current is applied to the proton exchange membrane under test based on a preset current density, the test and calculation module 300 is further configured to: detect the voltage change value of the proton exchange membrane under test at each humidity level and the number of hydrogen gas cycles during the dry-wet cycling of the proton exchange membrane under test; if the voltage change value of the proton exchange membrane under test at any humidity level exceeds a preset standard value, or the number of hydrogen gas cycles reaches a preset number, then it is determined that the proton exchange membrane under test meets the preset mechanical durability test termination conditions.

[0113] Furthermore, in some embodiments, the test and calculation module 300 is used to: apply multiple second currents to the proton exchange membrane under test based on a preset proton exchange membrane durability test device, under vertical resistance test parameters, and collect the new voltage when each second current is applied; and fit the multiple second currents and the new voltage corresponding to each second current to obtain the final vertical resistance of the proton exchange membrane under test.

[0114] Furthermore, in some embodiments, before determining the vertical resistance test parameters of the proton exchange membrane to be tested, the test and calculation module 300 is also used to: test the resistance of a preset proton exchange membrane durability test device based on the target compression ratio; and obtain the actual resistance of the proton exchange membrane to be tested based on the difference between the initial vertical resistance and the preset resistance of the proton exchange membrane durability test device.

[0115] Furthermore, in some embodiments, the test and calculation module 300 is used to: calculate the absolute value of the difference between the final vertical resistance and the initial vertical resistance; and obtain the performance degradation rate of the proton exchange membrane under test based on the ratio of the absolute value of the difference to the initial vertical resistance.

[0116] Furthermore, in some embodiments, the vertical resistance test parameters include at least one of the following: battery temperature, pipeline temperature, anode and cathode relative humidity, anode and cathode gas pressure, and hydrogen flow rate.

[0117] It should be noted that the explanation of the above-described method for calculating the performance degradation rate of a proton exchange membrane also applies to the device for calculating the performance degradation rate of the proton exchange membrane in this embodiment, and will not be repeated here.

[0118] According to the performance degradation rate calculation device for proton exchange membranes proposed in this application, under the vertical resistance test parameters of the proton exchange membrane under test, the initial vertical resistance of the proton exchange membrane under test is determined using a preset proton exchange membrane durability test device. Based on a preset relative humidity range between the anode and cathode, the proton exchange membrane under test is subjected to dry-wet cycling using hydrogen gas. Simultaneously, a target current is applied to the proton exchange membrane under test based on a preset current density. After meeting the preset mechanical durability test termination conditions, the vertical resistance of the proton exchange membrane under test is re-measured to obtain the final vertical resistance. The performance degradation rate of the proton exchange membrane under test is obtained based on the initial and final vertical resistances. This solves the problems of long test cycles and the inability to monitor the state of the proton exchange membrane in real time in related technologies. By introducing an electric field during the dry-wet cycling process, the influence of humidity on the proton exchange membrane is enhanced, accelerating the performance degradation of the membrane electrode and thus shortening the test time.

[0119] Figure 5 A schematic diagram of the structure of an electronic device provided in an embodiment of this application. The electronic device may include:

[0120] The memory 501, the processor 502, and the computer program stored on the memory 501 and capable of running on the processor 502.

[0121] When the processor 502 executes the program, it implements the method for calculating the performance degradation rate of the proton exchange membrane provided in the above embodiments.

[0122] Furthermore, electronic devices also include:

[0123] Communication interface 503 is used for communication between memory 501 and processor 502.

[0124] The memory 501 is used to store computer programs that can run on the processor 502.

[0125] The memory 501 may include high-speed RAM memory, and may also include non-volatile memory, such as at least one disk storage device.

[0126] If the memory 501, processor 502, and communication interface 503 are implemented independently, then the communication interface 503, memory 501, and processor 502 can be interconnected via a bus to complete communication between them. The bus can be an Industry Standard Architecture (ISA) bus, a Peripheral Component Interconnect (PCI) bus, or an Extended Industry Standard Architecture (EISA) bus, etc. The bus can be divided into address bus, data bus, control bus, etc. For ease of representation, Figure 5 The bus is represented by a single thick line, but this does not mean that there is only one bus or one type of bus.

[0127] Optionally, in a specific implementation, if the memory 501, processor 502, and communication interface 503 are integrated on a single chip, then the memory 501, processor 502, and communication interface 503 can communicate with each other through an internal interface.

[0128] The processor 502 may be a central processing unit (CPU), an application-specific integrated circuit (ASIC), or one or more integrated circuits configured to implement the embodiments of this application.

[0129] This embodiment also provides a computer-readable storage medium storing computer program code. When the computer program code is run on a computer, the computer executes the above-described related method steps to implement the method for calculating the performance decay rate of a proton exchange membrane provided in the above embodiment.

[0130] Through the above description of the embodiments, those skilled in the art will understand that, for the sake of convenience and brevity, only the division of the above functional modules is used as an example. In actual applications, the above functions can be assigned to different functional modules as needed, that is, the internal structure of the device can be divided into different functional modules to complete all or part of the functions described above.

[0131] In the embodiments provided in this application, it should be understood that the disclosed apparatus and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative; for instance, the division of modules or units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another device, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces; the indirect coupling or communication connection between devices or units may be electrical, mechanical, or other forms.

[0132] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A method for calculating the performance degradation rate of a proton exchange membrane, characterized in that, Includes the following steps: Determine the vertical resistance test parameters for the proton exchange membrane to be tested; Under the vertical resistance test parameters, the initial vertical resistance of the proton exchange membrane under test in the membrane electrode is determined using a preset proton exchange membrane durability test device. Based on a preset relative humidity range between the anode and cathode, the proton exchange membrane under test is subjected to dry-wet cycling using hydrogen gas. Simultaneously, a target current is applied to the proton exchange membrane under test based on a preset current density. After the preset mechanical durability test termination conditions are met, the vertical resistance of the proton exchange membrane under test is re-measured to obtain the final vertical resistance of the proton exchange membrane under test. The performance degradation rate of the proton exchange membrane under test is obtained based on the initial vertical resistance and the final vertical resistance.

2. The method according to claim 1, characterized in that, The step of determining the initial vertical resistance of the proton exchange membrane under test in the membrane electrode using a preset proton exchange membrane durability testing device under the vertical resistance test parameters includes: Based on the preset proton exchange membrane durability testing device, the compression ratio of the membrane electrode is adjusted to the target compression ratio. Under the vertical resistance test parameters, multiple first currents are applied to the proton exchange membrane under test, and the voltage at each first current is collected. The initial vertical resistance of the proton exchange membrane under test is obtained by fitting the plurality of first currents and the voltage corresponding to each first current.

3. The method according to claim 1, characterized in that, After performing wet-dry cycling on the proton exchange membrane under test using hydrogen gas within the preset relative humidity range between the anode and cathode, and simultaneously applying a target current to the proton exchange membrane under test based on a preset current density, the process further includes: The voltage change of the proton exchange membrane under test at each humidity level and the number of hydrogen circulation cycles during the dry-wet cycle of the proton exchange membrane under test are detected. If the voltage change of the proton exchange membrane under test exceeds the preset standard value at any humidity, or if the number of hydrogen circulation cycles reaches the preset number, then the proton exchange membrane under test is determined to meet the preset mechanical durability test termination condition.

4. The method according to claim 2, characterized in that, The step of re-measuring the vertical resistance of the proton exchange membrane under test after meeting the preset mechanical durability test termination conditions to obtain the final vertical resistance of the proton exchange membrane under test includes: Based on the preset proton exchange membrane durability testing device, under the vertical resistance test parameters, multiple second currents are applied to the proton exchange membrane under test, and the new voltage is collected when each second current is applied. The final vertical resistance of the proton exchange membrane under test is obtained by fitting the plurality of second currents and the new voltage corresponding to each second current.

5. The method according to claim 2, characterized in that, Before determining the vertical resistance test parameters of the proton exchange membrane to be tested, the following steps are also included: Based on the target compression ratio, the resistance of the preset proton exchange membrane durability testing device is tested; The actual resistance of the proton exchange membrane under test is obtained by the difference between the initial vertical resistance and the resistance of the preset proton exchange membrane durability testing device.

6. The method according to claim 1, characterized in that, The process of obtaining the performance degradation rate of the proton exchange membrane under test based on the initial vertical resistance and the final vertical resistance includes: Calculate the absolute value of the difference between the final vertical resistance and the initial vertical resistance; The performance degradation rate of the proton exchange membrane under test is obtained by the ratio of the absolute value of the difference to the initial vertical resistance.

7. The method according to any one of claims 1-6, characterized in that, The vertical resistance test parameters include at least one of the following: battery temperature, pipeline temperature, relative humidity of the anode and cathode, gas pressure of the anode and cathode, and hydrogen flow rate.

8. A device for calculating the performance degradation rate of a proton exchange membrane, characterized in that, include: The determination module is used to determine the vertical resistance test parameters of the proton exchange membrane to be tested; The measurement module is used to measure the initial vertical resistance of the proton exchange membrane under test in the membrane electrode using a preset proton exchange membrane durability test device under the vertical resistance test parameters. The testing and calculation module is used to perform dry and wet cycling on the proton exchange membrane under test using hydrogen gas based on a preset relative humidity range between the anode and cathode. At the same time, a target current is applied to the proton exchange membrane under test based on a preset current density. After the preset mechanical durability test termination condition is met, the vertical resistance of the proton exchange membrane under test is re-measured to obtain the final vertical resistance of the proton exchange membrane under test. The performance degradation rate of the proton exchange membrane under test is obtained based on the initial vertical resistance and the final vertical resistance.

9. An electronic device, characterized in that, include: A memory, a processor, and a computer program stored in the memory and executable on the processor, the processor executing the program to implement the method for calculating the performance degradation rate of a proton exchange membrane as described in any one of claims 1-7.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that, The program is executed by the processor to implement the method for calculating the performance degradation rate of the proton exchange membrane as described in any one of claims 1-7.

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