Method and device for measuring oxygen transmission resistance of membrane electrode

Abstract

The invention provides a method and a device for measuring oxygen transmission resistance of a membrane electrode, and relates to the technical field of battery detection. Comprising the following steps: assembling a membrane electrode to be tested and a preset battery component into a single battery based on a preset compression ratio and an assembly force, and performing battery activation on the single battery based on preset battery attribute parameters and an activation strategy; carrying out voltage loading on the single battery, and obtaining limiting current of the membrane electrode to be detected under multiple oxygen concentrations and multiple gas back pressures; based on the limiting current of the membrane electrode to be detected under multiple oxygen concentrations and multiple gas back pressures, obtaining the total oxygen transfer resistance corresponding to each gas back pressure; and based on the plurality of gas back pressures and the total oxygen transmission resistance corresponding to each gas back pressure, respectively determining oxygen transmission resistance in the gas diffusion layer and the catalyst layer. The oxygen transmission resistance of the membrane electrode can be tested and analyzed, and the accuracy and efficiency of testing the oxygen transmission resistance are improved.

Description

Technical Field

[0001] The present disclosure relates to the technical field of battery detection, and in particular to a method and a device for measuring oxygen transmission resistance of a membrane electrode. Background Art

[0002] In the related technology, proton exchange membrane fuel cells use hydrogen and air as fuel, have the advantages of zero emissions, high energy density and conversion efficiency, and are a clean energy power generation device. Since the gas transmission capacity of each component in the fuel cell is one of the most important factors affecting its performance, studying the internal gas transmission mechanism of proton exchange membrane fuel cells is of great significance to the development of proton exchange membrane fuel cells with high mass transfer performance. The oxygen transmission capacity under actual operating conditions is not just the sum of the offline test conditions of each component, and offline testing of component materials cannot reflect the oxygen transmission capacity during operation. Therefore, how to test and analyze the oxygen transmission resistance of the membrane electrode and improve the accuracy and efficiency of testing the oxygen transmission resistance has become one of the important research directions. Summary of the invention

[0003] The present disclosure aims to solve one of the technical problems in the related art at least to a certain extent. To this end, one purpose of the present disclosure is to provide a method for determining the oxygen transport resistance of a membrane electrode.

[0004] The second objective of the present disclosure is to provide a device for measuring the oxygen transmission resistance of a membrane electrode.

[0005] A third objective of the present disclosure is to provide an electronic device.

[0006] A fourth object of the present disclosure is to provide a non-transitory computer-readable storage medium.

[0007] A fifth object of the present disclosure is to provide a computer program product.

[0008] To achieve the above-mentioned purpose, the first embodiment of the present disclosure provides a method for measuring the oxygen transport resistance of a membrane electrode, comprising:

[0009] Based on the preset compression rate and assembly force, the membrane electrode to be tested and the preset battery components are assembled into a single cell, and the single cell is activated based on the preset battery property parameters and activation strategy, and the battery property parameters include one or more of the battery temperature, cathode and anode gas flow, cathode and anode dew point, and cathode and anode back pressure;

[0010] Using hydrogen as the anode gas and a mixture of oxygen and nitrogen as the cathode gas, the single cell is voltage-loaded to obtain the limiting current of the membrane electrode under multiple oxygen concentrations and multiple gas back pressures.

[0011] Based on the limiting current of the membrane electrode to be tested under multiple oxygen concentrations and multiple gas back pressures, the total oxygen transmission resistance corresponding to each gas back pressure is obtained;

[0012] Based on the multiple gas back pressures and the total oxygen transport resistance corresponding to each gas back pressure, the oxygen transport resistance in the gas diffusion layer and the oxygen transport resistance in the catalyst layer are determined respectively.

[0013] In the disclosed embodiment, a single cell is subjected to voltage loading to obtain the limiting current of the membrane electrode to be tested under multiple oxygen concentrations and multiple gas back pressures. By converting the oxygen transmission resistance test into a limiting current test under multiple conditions, the operation is facilitated and the flexibility of the test is improved. The test conditions are designed according to the characteristics of the limiting current test so that the performance bottleneck during the test is the oxygen transmission capacity, and the influence of other factors is eliminated. Based on the limiting current of the membrane electrode to be tested under multiple oxygen concentrations and multiple gas back pressures, the total oxygen transmission resistance corresponding to each gas back pressure is obtained. During the test, the oxygen concentration and back pressure can be pre-set according to the characteristics of the membrane electrode to meet different requirements for test efficiency and data accuracy. Based on multiple gas back pressures and the total oxygen transmission resistance corresponding to each gas back pressure, the oxygen transmission resistance in the gas diffusion layer and the catalyst layer are determined respectively. The data processing process is simple, and the transmission resistance result is ensured to be accurate by fitting multiple groups of test data. The mass transfer capacity of the catalyst layer and the gas diffusion layer of the membrane electrode can be distinguished, and their oxygen transmission resistance values ​​can be obtained respectively.

[0014] To achieve the above-mentioned purpose, the second embodiment of the present disclosure provides a device for measuring membrane electrode oxygen transmission resistance, comprising:

[0015] The first processing module is used to assemble the membrane electrode to be tested and the preset battery components into a single cell based on a preset compression rate and assembly force, and to activate the single cell based on preset battery property parameters and activation strategies, wherein the battery property parameters include one or more of battery temperature, cathode and anode gas flow, cathode and anode dew point, and cathode and anode back pressure;

[0016] The first acquisition module is used to use hydrogen as the anode gas and a mixed gas of oxygen and nitrogen as the cathode gas to load the single cell with voltage, and obtain the limiting current of the membrane electrode to be tested under multiple oxygen concentrations and multiple gas back pressures;

[0017] The second acquisition module is used to obtain the total oxygen transmission resistance corresponding to each gas back pressure based on the limiting current of the membrane electrode to be tested under multiple oxygen concentrations and multiple gas back pressures;

[0018] The second processing module is used to determine the oxygen transmission resistance in the gas diffusion layer and the oxygen transmission resistance in the catalyst layer respectively based on the multiple gas back pressures and the total oxygen transmission resistance corresponding to each gas back pressure.

[0019] To achieve the above-mentioned purpose, a third aspect of the present disclosure provides an electronic device, including:

[0020] at least one processor; and

[0021] a memory communicatively connected to at least one processor; wherein,

[0022] The memory stores instructions that can be executed by at least one processor, and the instructions are executed by at least one processor so that the at least one processor can execute the method for determining the oxygen transport resistance of the membrane electrode provided in the embodiment of the first aspect of the present disclosure.

[0023] To achieve the above objectives, the fourth aspect of the present disclosure provides a computer-readable storage medium having computer instructions stored thereon, wherein the computer instructions are used to enable a computer to execute the method for determining the membrane electrode oxygen transfer resistance provided in the first aspect of the present disclosure.

[0024] To achieve the above objectives, the fifth embodiment of the present disclosure provides a computer program product, including a computer program, which, when executed by a processor, implements the method for determining the membrane electrode oxygen transfer resistance provided in the first embodiment of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is a flow chart of a method for determining oxygen transmission resistance of a membrane electrode according to an embodiment of the present disclosure;

[0026] Figure 2 is a schematic structural diagram of a single battery according to an embodiment of the present disclosure;

[0027] Figure 3 is a flow chart of a method for determining oxygen transmission resistance of a membrane electrode according to an embodiment of the present disclosure;

[0028] Figure 4 is a flow chart of a method for determining oxygen transmission resistance of a membrane electrode according to an embodiment of the present disclosure;

[0029] Figure 5 is a schematic diagram of a limiting current density-oxygen partial pressure curve of an embodiment of the present disclosure;

[0030] Figure 6 is a schematic diagram of an oxygen transmission resistance-back pressure curve according to an embodiment of the present disclosure;

[0031] Figure 7 It is a structural block diagram of a device for measuring oxygen transmission resistance of a membrane electrode according to an embodiment of the present disclosure;

[0032] Figure 8 It is a schematic diagram of the structure of an electronic device according to an embodiment of the present disclosure. DETAILED DESCRIPTION

[0033] Embodiments of the present disclosure are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present disclosure, and should not be construed as limiting the present disclosure.

[0034] For ease of understanding, the terms in the embodiments of the present disclosure are explained below:

[0035] Proton Exchange Membrane (PEM) is the core component of Proton Exchange Membrane Fuel Cell (PEMFC) and plays a key role in battery performance. It not only has a barrier effect, but also has the function of conducting protons.

[0036] The surface of the catalyst-coated membrane (CCM) is coated with a catalytic layer, which constitutes the membrane of the reaction area of ​​the electrode.

[0037] Membrane Electrode Assembly (MEA), also known as membrane electrode, is a key core component of fuel cell power generation.

[0038] The membrane electrode includes a gas diffusion layer, a catalyst layer and a proton exchange membrane, wherein the gas diffusion layer and the catalyst layer include a cathode and an anode respectively. For example, the structure of the membrane electrode can be an anode gas diffusion layer, an anode catalyst layer, a proton exchange membrane, a cathode catalyst layer, and a cathode gas diffusion layer.

[0039] GDL (Gas Diffusion Layer) is a key component in hydrogen fuel cells. It is mainly used to separate the hydrogen and oxygen sides and promote gas transmission, moisture management and electron conduction.

[0040] The compression ratio refers to the ratio between the thickness of the membrane electrode after the pressure it is subjected to during the assembly process and its original thickness. It reflects the degree of thickness reduction of the membrane electrode during the compression process.

[0041] Assembly force refers to the pressure applied when assembling the membrane electrode.

[0042] The following describes the method and device for measuring the oxygen transmission resistance of the membrane electrode according to the embodiment of the present disclosure in conjunction with the accompanying drawings.

[0043] Figure 1 is a flow chart of a method for determining oxygen transport resistance of a membrane electrode according to an embodiment of the present disclosure, such as Figure 1 As shown, the method comprises the following steps:

[0044] S101, based on a preset compression rate and assembly force, assembling the membrane electrode to be tested and preset battery components into a single cell, and based on preset battery property parameters and activation strategy, performing battery activation on the single cell.

[0045] The membrane electrode to be tested and the preset battery components are assembled into a single cell. The structure of the assembled single cell can be as follows Figure 2 As shown, in some embodiments, the compression rate can be limited based on the thickness of the seal, and optionally, the preset compression rate can be between 20% and 30%. In other embodiments, the compression rate can also be other values, which are not limited in the embodiments of the present application. In some embodiments, bolts can be used to assemble the membrane electrode to be tested and the components to obtain an assembled single cell, wherein the assembly force of the single cell is limited based on the number of turns / torque of the bolt installation.

[0046] In some embodiments, for example, a single cell can be tested for battery leakage based on a pressure difference leak test method to determine whether the single cell has leakage. If the single cell has leakage, the membrane electrode of the single cell is replaced or the single cell is reassembled. In other embodiments, a single cell can also be tested for battery leakage based on a wet immersion method to determine whether the single cell has leakage. After the leak test is normal, it is installed on a pre-deployed fuel cell test platform.

[0047] In the disclosed embodiment, the battery property parameters include one or more of the battery temperature, cathode and cathode gas flow, cathode and cathode dew point, and cathode and cathode back pressure. Taking the battery property parameters including the battery temperature and cathode and cathode gas flow as an example, the activation strategy can be: start hydrogen and air to flow into the anode and cathode at a preset flow rate, slowly increase the battery temperature to the designed battery temperature; gradually increase the load current from a low current until the battery reaches the normal operating current, monitor the battery voltage and other performance parameters; let the battery run for a preset time at the set current and battery temperature until the voltage and other performance parameters are stable, and determine that the battery activation is completed.

[0048] S102, using hydrogen as the anode gas and a mixed gas of oxygen and nitrogen as the cathode gas, applying voltage to the single cell to obtain the limiting current of the membrane electrode to be tested under multiple oxygen concentrations and multiple gas back pressures.

[0049] In the disclosed embodiment, the anode gas is kept as hydrogen, and the cathode gas is switched to an oxygen / nitrogen mixture, wherein the oxygen concentration is c1, the back pressure is set to p1, and the other parameters are set according to the preset battery property parameters, and the voltage is loaded. The load can be an intelligent power device. For example, the voltage is gradually reduced by 0.1V, for example, 0.9V, 0.8V, ..., and the current increases as the voltage decreases. When the voltage continues to decrease and the current no longer increases, it is the limiting current of the membrane electrode under the test conditions. Similarly, the limiting current of the membrane electrode under different oxygen concentrations (c2, c3...) and back pressures (p2, p3...) can be measured.

[0050] S103, based on the limiting current of the membrane electrode to be tested under multiple oxygen concentrations and multiple gas back pressures, obtaining the total oxygen transmission resistance corresponding to each gas back pressure.

[0051] In the embodiment of the present disclosure, the oxygen concentration is converted into the oxygen partial pressure. Based on the limiting current of the membrane electrode to be tested under multiple oxygen concentrations and multiple gas back pressures, the oxygen partial pressure under different gas back pressures and the corresponding limiting current density are plotted. That is, with the oxygen partial pressure as the abscissa and the limiting current density as the ordinate, the curves corresponding to different gas back pressures are obtained. After fitting the data points, the total oxygen transmission resistance R under the back pressure can be calculated based on the slope K1 of the curve. total .

[0052] S104: Based on the plurality of gas back pressures and the total oxygen transmission resistance corresponding to each gas back pressure, respectively determine the oxygen transmission resistance in the gas diffusion layer and the oxygen transmission resistance in the catalyst layer.

[0053] Total oxygen transmission resistance R under different back pressures total The vertical axis is the back pressure, and the horizontal axis is the back pressure. A curve of the relationship between the two is drawn. Based on the slope K2 of the curve, the oxygen transmission resistance (R GDL ); The transmission resistance when the total gas pressure is extrapolated to 0 kPa, that is, the curve intercept b is the oxygen transmission resistance in the catalyst layer (R CL ).

[0054] In the disclosed embodiments, a single cell is subjected to voltage loading to obtain the limiting current of the membrane electrode to be tested under multiple oxygen concentrations and multiple gas back pressures. By converting the oxygen transmission resistance test into a limiting current test under multiple conditions, operation is facilitated and the flexibility of the test is improved. Based on the limiting current of the membrane electrode to be tested under multiple oxygen concentrations and multiple gas back pressures, the total oxygen transmission resistance corresponding to each gas back pressure is obtained. During the test, the oxygen concentration and back pressure can be pre-set according to the membrane electrode characteristics to meet different requirements for test efficiency and data accuracy. Based on multiple gas back pressures and the total oxygen transmission resistance corresponding to each gas back pressure, the oxygen transmission resistance in the gas diffusion layer and the catalyst layer are determined respectively. The data processing process is simple, and the transmission resistance results are ensured to be accurate by fitting multiple groups of test data.

[0055] Figure 3 is a flow chart of a method for determining oxygen transport resistance of a membrane electrode according to an embodiment of the present disclosure, such as Figure 3 As shown, the method comprises the following steps:

[0056] S301, assembling the membrane electrode to be tested and the preset battery components into a single cell based on the preset compression rate and assembly force, and activating the single cell based on the preset battery property parameters and activation strategy.

[0057] Among them, the battery property parameters include one or more of the battery temperature, anode and cathode gas flow, anode and cathode dew point, and anode and cathode back pressure.

[0058] For the introduction of step S301, please refer to the content of the above embodiment, which will not be repeated here.

[0059] S302, for a first oxygen concentration among multiple oxygen concentrations and a first gas back pressure among multiple gas back pressures, calling a load to perform voltage loading on a single cell according to an initial voltage under the first oxygen concentration and the first gas back pressure to obtain a current of the single cell.

[0060] It should be noted that in the embodiments of the present disclosure, hydrogen is used as the anode gas, and a mixed gas of oxygen and nitrogen is used as the cathode gas.

[0061] Taking the first oxygen concentration among multiple oxygen concentrations as c1, the first gas back pressure among multiple gas back pressures as p1, and the initial voltage as 0.9V as an example, the load is called at the first oxygen concentration c1 and the first gas back pressure p1, and the smart power device is called to load the single battery at the initial voltage 0.9V to obtain the current of the single battery.

[0062] S303, gradually reducing the load voltage and monitoring the current of the single cell. When the voltage continues to be reduced and the current stops increasing, it is determined that the limiting current of the membrane electrode to be tested under the first oxygen concentration and the first gas back pressure is monitored.

[0063] The load voltage is gradually reduced at intervals of 0.1V to 0.8V, 0.7V, ..., and the current increases as the voltage decreases. When the current stops increasing when the voltage continues to decrease, it is the limiting current of the membrane electrode under the test conditions.

[0064] For example, when the voltage drops from 0.9V to 0.4V, the current gradually increases. When the voltage drops to 0.3V, the current is the same as the current at 0.4V, and the current no longer increases. This current is the limiting current.

[0065] S304, changing the oxygen concentration and / or the gas back pressure and continuing to apply voltage loading to the single cell until the limiting current of the membrane electrode to be tested under multiple oxygen concentrations and multiple gas back pressures is obtained.

[0066] Taking multiple oxygen concentrations including (c1, c2, c3, c4, c5) and multiple gas back pressures including (p1, p2, p3, p4) as an example, the oxygen concentration and / or gas back pressure are continuously changed and the voltage of the single cell is continuously loaded until the limiting current of the membrane electrode to be tested at each oxygen concentration and each gas back pressure is obtained, that is, 20 limiting currents are obtained.

[0067] S305, based on the limiting current of the membrane electrode to be tested under multiple oxygen concentrations and multiple gas back pressures, obtain the total oxygen transmission resistance corresponding to each gas back pressure.

[0068] S306: Based on the multiple gas back pressures and the total oxygen transmission resistance corresponding to each gas back pressure, the oxygen transmission resistance in the gas diffusion layer and the oxygen transmission resistance in the catalyst layer are determined respectively.

[0069] For the introduction of steps S305 to S306, please refer to the contents of the above embodiment, which will not be repeated here.

[0070] In the embodiment of the present disclosure, for a first oxygen concentration among multiple oxygen concentrations and a first gas back pressure among multiple gas back pressures, a load is called to perform voltage pulling on a single cell according to an initial voltage at the first oxygen concentration and the first gas back pressure, the current of the single cell is obtained, the voltage pulled by the load is gradually reduced, and the current of the single cell is monitored. When the voltage continues to be reduced and the current no longer increases, it is determined that the limiting current of the membrane electrode to be tested at the first oxygen concentration and the first gas back pressure is monitored, the oxygen concentration and / or the gas back pressure is changed and the voltage pulling on the single cell continues until the limiting current of the membrane electrode to be tested at multiple oxygen concentrations and multiple gas back pressures is obtained. By converting the oxygen transmission resistance test into a limiting current test under multiple conditions, operation is facilitated and the flexibility of the test is improved. The test conditions can be designed according to the characteristics of the limiting current test, so that the performance bottleneck during the test is the oxygen transmission capacity, and the influence of other factors is eliminated, thereby improving the test efficiency and accuracy.

[0071] Figure 4 is a flow chart of a method for determining oxygen transport resistance of a membrane electrode according to an embodiment of the present disclosure, such as Figure 4 As shown, the method comprises the following steps:

[0072] S401, assembling the membrane electrode to be tested and the preset battery components into a single cell based on the preset compression rate and assembly force, and activating the single cell based on the preset battery property parameters and activation strategy.

[0073] Among them, the battery property parameters include one or more of the battery temperature, anode and cathode gas flow, anode and cathode dew point, and anode and cathode back pressure.

[0074] S402, using hydrogen as the anode gas and a mixed gas of oxygen and nitrogen as the cathode gas, applying voltage to the single cell to obtain the limiting current of the membrane electrode to be tested under multiple oxygen concentrations and multiple gas back pressures.

[0075] For the introduction of step S401 to step S402, please refer to the contents of the above embodiment, which will not be repeated here.

[0076] S403, based on the limiting current of the membrane electrode to be tested under multiple oxygen concentrations and multiple gas back pressures, data points are fitted between the oxygen partial pressure under multiple gas back pressures and the corresponding limiting current density to obtain a schematic diagram of the limiting current density-oxygen partial pressure curve.

[0077] Taking multiple oxygen concentrations including (c1, c2, c3, c4, c5) and multiple gas back pressures including (p1, p2, p3, p4) as an example, the oxygen concentration is converted into oxygen partial pressure, and the oxygen partial pressure under each gas back pressure and the corresponding limiting current density are fitted to obtain the following data points: Figure 5 Schematic diagram of the limiting current density-oxygen partial pressure curve shown.

[0078] S404, for each gas back pressure, based on a limiting current density-oxygen partial pressure curve diagram, obtaining a first slope of limiting current density to oxygen partial pressure under the gas back pressure.

[0079] Based on the limiting current density-oxygen partial pressure curve schematic diagram, the first slope K1 of the limiting current density to the oxygen partial pressure under each gas back pressure is obtained.

[0080] S405 , constructing a function based on the first slope and the gas back pressure to obtain a total oxygen transmission resistance corresponding to the gas back pressure.

[0081] In some embodiments, there is a functional relationship between the first slope, gas back pressure, and total oxygen transfer resistance, and a function is constructed based on the first slope and gas back pressure to obtain the total oxygen transfer resistance corresponding to each gas back pressure.

[0082] S406, obtaining a schematic diagram of an oxygen transmission resistance-back pressure curve based on the multiple gas back pressures and the total oxygen transmission resistance corresponding to each gas back pressure.

[0083] Total oxygen transmission resistance R under different back pressures total As the ordinate, the gas back pressure as the abscissa, perform data fitting, and obtain Figure 6 Schematic diagram of oxygen transfer resistance-back pressure curve shown.

[0084] S407, determining the curve intercept in the oxygen transmission resistance-back pressure curve schematic diagram as the oxygen transmission resistance in the catalyst layer.

[0085] In the embodiment of the present disclosure, the transmission resistance when the total gas pressure is extrapolated to 0 kPa, that is, the curve intercept b is used as the oxygen transmission resistance (R CL ), the oxygen transfer resistance in the catalytic layer is a constant.

[0086] S408: The difference between the total oxygen transmission resistance corresponding to each gas back pressure and the oxygen transmission resistance in the catalyst layer is determined as the oxygen transmission resistance in the gas diffusion layer corresponding to the gas back pressure.

[0087] In some embodiments, the difference between the total oxygen transmission resistance corresponding to each gas back pressure and the oxygen transmission resistance in the catalyst layer is obtained, and further, the difference (R total -R CL ) is determined as the oxygen transport resistance (R GDL ).

[0088] In some embodiments, the curve slope in the oxygen transfer resistance-back pressure curve diagram, that is, the second slope K2, is obtained, and the product of the second slope and the gas back pressure is used as the oxygen transfer resistance in the gas diffusion layer corresponding to the gas back pressure.

[0089] The disclosed embodiments provide a high-precision, high-efficiency, high-reliability, online method for determining the oxygen transfer resistance of a membrane electrode. Under actual operating conditions, online transfer resistance tests can be performed on membrane electrodes with different component materials and process formulations. The data processing process is fast and accurate, providing real and accurate data support for the study of the mass transfer capacity of the membrane electrode.

[0090] Figure 7 is a structural block diagram of a device for measuring oxygen transmission resistance of a membrane electrode according to an embodiment of the present disclosure, such as Figure 7 As shown, the device 700 for measuring membrane electrode oxygen transmission resistance includes:

[0091] The first processing module 710 is used to assemble the membrane electrode to be tested and the preset battery components into a single cell based on the preset compression rate and assembly force, and activate the single cell based on the preset battery property parameters and activation strategy, where the battery property parameters include one or more of the battery temperature, cathode and anode gas flow, cathode and anode dew point, and cathode and anode back pressure;

[0092] The first acquisition module 720 is used to use hydrogen as the anode gas and a mixed gas of oxygen and nitrogen as the cathode gas to perform voltage loading on the single cell to obtain the limiting current of the membrane electrode to be tested under multiple oxygen concentrations and multiple gas back pressures;

[0093] The second acquisition module 730 is used to acquire the total oxygen transmission resistance corresponding to each gas back pressure based on the limiting current of the membrane electrode to be tested under multiple oxygen concentrations and multiple gas back pressures;

[0094] The second processing module 740 is used to determine the oxygen transmission resistance in the gas diffusion layer and the oxygen transmission resistance in the catalyst layer respectively based on the multiple gas back pressures and the total oxygen transmission resistance corresponding to each gas back pressure.

[0095] In some implementations, the first acquisition module 720 is further configured to:

[0096] For a first oxygen concentration among the multiple oxygen concentrations and a first gas back pressure among the multiple gas back pressures, calling a load to perform voltage loading on the single cell according to an initial voltage under the first oxygen concentration and the first gas back pressure to obtain a current of the single cell;

[0097] The load voltage is gradually reduced, and the current of the single cell is monitored. When the voltage is further reduced and the current no longer increases, it is determined that the limiting current of the membrane electrode to be tested under the first oxygen concentration and the first gas back pressure is monitored;

[0098] The oxygen concentration and / or gas back pressure are changed and the voltage loading of the single cell is continued until the limiting current of the membrane electrode to be tested under multiple oxygen concentrations and multiple gas back pressures is obtained.

[0099] In some implementations, the second acquisition module 730 is further configured to:

[0100] Based on the limiting current of the membrane electrode to be tested under multiple oxygen concentrations and multiple gas back pressures, the oxygen partial pressure under multiple gas back pressures and the corresponding limiting current density are fitted to obtain a schematic diagram of the limiting current density-oxygen partial pressure curve;

[0101] For each gas back pressure, based on the limiting current density-oxygen partial pressure curve diagram, obtain the first slope of the limiting current density to the oxygen partial pressure under the gas back pressure;

[0102] A function is constructed based on the first slope and the gas back pressure to obtain the total oxygen transmission resistance corresponding to the gas back pressure.

[0103] In some implementations, the second processing module 740 is further configured to:

[0104] Based on multiple gas back pressures and the total oxygen transmission resistance corresponding to each gas back pressure, a schematic diagram of an oxygen transmission resistance-back pressure curve is obtained;

[0105] The curve intercept in the oxygen transfer resistance-back pressure curve diagram is determined as the oxygen transfer resistance in the catalyst layer;

[0106] The difference between the total oxygen transfer resistance corresponding to each gas back pressure and the oxygen transfer resistance in the catalyst layer is determined as the oxygen transfer resistance in the gas diffusion layer corresponding to the gas back pressure, or based on the schematic diagram of the oxygen transfer resistance-back pressure curve, the second slope of the oxygen transfer resistance to the gas back pressure under the gas back pressure is obtained, and based on the product of the second slope and the gas back pressure, the oxygen transfer resistance in the gas diffusion layer corresponding to the gas back pressure is obtained.

[0107] In some implementations, the first processing module 710 is further configured to:

[0108] Conduct battery leak test on single battery to determine whether the single battery has leakage;

[0109] If a single cell leaks, replace the membrane electrode of the single cell or reassemble the single cell.

[0110] In the disclosed embodiments, a single cell is subjected to voltage loading to obtain the limiting current of the membrane electrode to be tested under multiple oxygen concentrations and multiple gas back pressures. By converting the oxygen transmission resistance test into a limiting current test under multiple conditions, operation is facilitated and the flexibility of the test is improved. Based on the limiting current of the membrane electrode to be tested under multiple oxygen concentrations and multiple gas back pressures, the total oxygen transmission resistance corresponding to each gas back pressure is obtained. During the test, the oxygen concentration and back pressure can be pre-set according to the membrane electrode characteristics to meet different requirements for test efficiency and data accuracy. Based on multiple gas back pressures and the total oxygen transmission resistance corresponding to each gas back pressure, the oxygen transmission resistance in the gas diffusion layer and the catalyst layer are determined respectively. The data processing process is simple, and the transmission resistance results are ensured to be accurate by fitting multiple groups of test data.

[0111] The acquisition, transmission, storage, use, and processing of data in the technical solution disclosed in this disclosure are in compliance with the relevant provisions of laws and regulations.

[0112] It should be noted that in the embodiments of the present disclosure, certain software, components, models and other existing solutions in the industry may be mentioned, which should be regarded as exemplary. Their purpose is only to illustrate the feasibility of implementing the technical solution of the present application, but it does not mean that the applicant has or will necessarily use the solution.

[0113] Figure 8 It is a schematic diagram of the structure of an electronic device according to an embodiment of the present disclosure.

[0114] like Figure 8 As shown, the electronic device 800 includes:

[0115] The memory 801 and the processor 802, a bus 803 connecting different components (including the memory 801 and the processor 802), the memory 801 stores a computer program, and when the processor 802 executes the program, the method for determining the oxygen transfer resistance of the membrane electrode according to the embodiment of the present disclosure is implemented.

[0116] Bus 803 represents one or more of several types of bus structures, including a memory bus or memory controller, a peripheral bus, an accelerated graphics port, a processor or a local bus using any of a variety of bus structures. For example, these architectures include but are not limited to Industry Standard Architecture (ISA) bus, Micro Channel Architecture (MAC) bus, Enhanced ISA bus, Video Electronics Standards Association (VESA) local bus and Peripheral Component Interconnect (PCI) bus.

[0117] The electronic device 800 typically includes a variety of electronic device readable media. These media can be any available media that can be accessed by the electronic device 800, including volatile and non-volatile media, removable and non-removable media.

[0118] The memory 801 may also include computer system readable media in the form of volatile memory, such as random access memory (RAM) 804 and / or cache memory 805. The electronic device 800 may further include other removable / non-removable, volatile / non-volatile computer system storage media. By way of example only, the storage system 806 may be used to read and write non-removable, non-volatile magnetic media ( Figure 8 not shown, usually called a "hard drive"). Although Figure 8 Not shown in the figure, a disk drive for reading and writing to a removable non-volatile disk (e.g., a "floppy disk"), and an optical disk drive for reading and writing to a removable non-volatile optical disk (e.g., a CD-ROM, a DVD-ROM, or other optical media) may be provided. In these cases, each drive may be connected to the bus 803 via one or more data medium interfaces. The memory 801 may include at least one program product having a set (e.g., at least one) of program modules that are configured to perform the functions of the various embodiments of the present disclosure.

[0119] A program / utility 808 having a set (at least one) of program modules 807 may be stored, for example, in the memory 801, such program modules 807 including but not limited to an operating system, one or more application programs, other program modules, and program data, each of which or some combination may include an implementation of a network environment. The program modules 807 generally perform the functions and / or methods of the embodiments described in the present disclosure.

[0120] The electronic device 800 may also communicate with one or more external devices 809 (e.g., keyboard, pointing device, display 811, etc.), one or more devices that enable a user to interact with the electronic device 800, and / or any device that enables the electronic device 800 to communicate with one or more other computing devices (e.g., network card, modem, etc.). Such communication may be performed through an input / output (I / O) interface 812. Furthermore, the electronic device 800 may also communicate with one or more networks (e.g., local area network (LAN), wide area network (WAN) and / or public network, such as the Internet) through a network adapter 813. Figure 8 As shown, the network adapter 813 communicates with other modules of the electronic device 800 via the bus 803. It should be understood that, although not shown in the figure, other hardware and / or software modules can be used in conjunction with the electronic device 800, including but not limited to: microcode, device drivers, redundant processing units, external disk drive arrays, RAID systems, tape drives, and data backup storage systems.

[0121] The processor 802 executes various functional applications and data processing by running the programs stored in the memory 801 .

[0122] It should be noted that the implementation process and technical principles of the electronic device of this embodiment refer to the aforementioned explanation of the method for determining the oxygen transmission resistance of the membrane electrode of the embodiment of the present disclosure, and will not be repeated here.

[0123] In order to implement the above embodiments, the present disclosure also proposes a computer-readable storage medium.

[0124] Wherein, when the instructions in the computer-readable storage medium are executed by the processor of the electronic device, the electronic device can perform the above-mentioned method for determining the oxygen transmission resistance of the membrane electrode. Optionally, the computer-readable storage medium can be a ROM, a random access memory (RAM), a CD-ROM, a magnetic tape, a floppy disk, an optical data storage device, etc.

[0125] Those skilled in the art will readily appreciate other embodiments of the present disclosure after considering the specification and practicing the invention disclosed herein. The present disclosure is intended to cover any variations, uses or adaptations of the present disclosure that follow the general principles of the present disclosure and include common knowledge or customary techniques in the art that are not disclosed in the present disclosure. The description and examples are to be considered exemplary only, and the true scope and spirit of the present disclosure are indicated by the following claims.

[0126] It should be understood that the present disclosure is not limited to the exact structures that have been described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.

Claims

1. A method for determining oxygen transmission resistance of a membrane electrode, characterized in that: include: Based on the preset compression rate and assembly force, the membrane electrode to be tested and the preset battery components are assembled into a single cell, and the single cell is activated based on the preset battery property parameters and activation strategy, wherein the battery property parameters include one or more of the battery temperature, cathode and anode gas flow, cathode and anode dew point, and cathode and anode back pressure; Using hydrogen as anode gas and a mixed gas of oxygen and nitrogen as cathode gas, the single cell is subjected to voltage loading to obtain the limiting current of the membrane electrode to be tested under multiple oxygen concentrations and multiple gas back pressures; Based on the limiting current of the membrane electrode to be tested under the multiple oxygen concentrations and the multiple gas back pressures, obtaining the total oxygen transmission resistance corresponding to each gas back pressure; Based on the plurality of gas back pressures and the total oxygen transport resistance corresponding to each of the gas back pressures, the oxygen transport resistance in the gas diffusion layer and the oxygen transport resistance in the catalyst layer are determined respectively.

2. The method according to claim 1, characterized in that The voltage loading of the single cell to obtain the limiting current of the membrane electrode to be tested under multiple oxygen concentrations and multiple gas back pressures includes: For a first oxygen concentration among the multiple oxygen concentrations and a first gas back pressure among the multiple gas back pressures, calling a preset load to perform voltage loading on the single cell according to an initial voltage under the first oxygen concentration and the first gas back pressure, and obtaining a current of the single cell; gradually reducing the voltage of the load and monitoring the current of the single cell, and when the voltage continues to be reduced and the current no longer increases, determining that the limiting current of the membrane electrode to be tested under the first oxygen concentration and the first gas back pressure is monitored; The oxygen concentration and / or the gas back pressure are changed and the voltage loading of the single cell is continued until the limiting current of the membrane electrode to be tested under the multiple oxygen concentrations and the multiple gas back pressures is obtained.

3. The method according to claim 1, characterized in that The obtaining of the total oxygen transmission resistance corresponding to each gas back pressure based on the limiting current of the membrane electrode to be tested under the multiple oxygen concentrations and the multiple gas back pressures comprises: Based on the limiting current of the membrane electrode to be tested under the multiple oxygen concentrations and the multiple gas back pressures, data points are fitted between the oxygen partial pressure under the multiple gas back pressures and the corresponding limiting current density to obtain a limiting current density-oxygen partial pressure curve schematic diagram; For each of the gas back pressures, based on the limiting current density-oxygen partial pressure curve schematic diagram, obtaining a first slope of the limiting current density to the oxygen partial pressure under the gas back pressure; A function is constructed based on the first slope and the gas back pressure to obtain the total oxygen transmission resistance corresponding to the gas back pressure.

4. The method according to claim 1, characterized in that The determining of the oxygen transmission resistance in the gas diffusion layer and the catalyst layer based on the plurality of gas back pressures and the total oxygen transmission resistance corresponding to each gas back pressure comprises: Based on the plurality of gas back pressures and the total oxygen transmission resistance corresponding to each gas back pressure, obtaining a schematic diagram of an oxygen transmission resistance-back pressure curve; The intercept of the curve in the oxygen transmission resistance-back pressure curve diagram is determined as the oxygen transmission resistance in the catalyst layer; The difference between the oxygen transfer resistance corresponding to each gas back pressure and the oxygen transfer resistance in the catalyst layer is determined as the oxygen transfer resistance in the gas diffusion layer corresponding to the gas back pressure, or based on the oxygen transfer resistance-back pressure curve schematic diagram, the second slope of the oxygen transfer resistance to the gas back pressure under the gas back pressure is obtained, and based on the product of the second slope and the gas back pressure, the oxygen transfer resistance in the gas diffusion layer corresponding to the gas back pressure is obtained.

5. The method according to any one of claims 1 to 4, characterized in that: After the membrane electrode to be tested is assembled into a single cell, the method further comprises: Performing a battery leak test on the single battery to determine whether the single battery has leakage; If the single cell leaks, the membrane electrode of the single cell is replaced or the single cell is reassembled.

6. A device for measuring membrane electrode oxygen transmission resistance, characterized in that: include: A first processing module is used to assemble the membrane electrode to be tested and the preset battery components into a single cell based on a preset compression rate and assembly force, and to activate the single cell based on preset battery property parameters and activation strategies, wherein the battery property parameters include one or more of battery temperature, cathode and anode gas flow, cathode and anode dew point, and cathode and anode back pressure; The first acquisition module is used to use hydrogen as the anode gas and a mixed gas of oxygen and nitrogen as the cathode gas to load the single cell with voltage, so as to obtain the limiting current of the membrane electrode to be tested under multiple oxygen concentrations and multiple gas back pressures; A second acquisition module is used to acquire the total oxygen transmission resistance corresponding to each gas back pressure based on the limiting current of the membrane electrode to be tested under the multiple oxygen concentrations and the multiple gas back pressures; The second processing module is used to determine the oxygen transmission resistance in the gas diffusion layer and the oxygen transmission resistance in the catalyst layer respectively based on the plurality of gas back pressures and the total oxygen transmission resistance corresponding to each gas back pressure.

7. The device according to claim 6, characterized in that The second processing module is further used for: Based on the plurality of gas back pressures and the oxygen transmission resistance corresponding to each gas back pressure, obtaining a schematic diagram of an oxygen transmission resistance-back pressure curve; The intercept of the curve in the oxygen transmission resistance-back pressure curve diagram is determined as the oxygen transmission resistance in the catalyst layer; The difference between the oxygen transfer resistance corresponding to each gas back pressure and the oxygen transfer resistance in the catalyst layer is determined as the oxygen transfer resistance in the gas diffusion layer corresponding to the gas back pressure, or based on the oxygen transfer resistance-back pressure curve schematic diagram, the second slope of the oxygen transfer resistance to the gas back pressure under the gas back pressure is obtained, and based on the product of the second slope and the gas back pressure, the oxygen transfer resistance in the gas diffusion layer corresponding to the gas back pressure is obtained.

8. An electronic device comprising: at least one processor; as well as a memory communicatively connected to the at least one processor; wherein, The memory stores instructions that can be executed by the at least one processor, and the instructions are executed by the at least one processor to enable the at least one processor to perform the method according to any one of claims 1 to 5.

9. A non-transitory computer-readable storage medium storing computer instructions, wherein: The computer instructions are used to cause the computer to execute the steps of the method according to any one of claims 1-5.

10. A computer program product, comprising a computer program, which, when executed by a processor, implements the method according to any one of claims 1 to 5.

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