Membrane electrode water management method, equipment and system

Abstract

The invention discloses a water management method, equipment and system for a membrane electrode, which are applied to the technical field of fuel cells, and the method comprises the following steps: obtaining the current current density of a to-be-tested membrane electrode and the current amplitude of bubble sound in the to-be-tested membrane electrode; a reference amplitude corresponding to the current current density is determined according to a preset reference curve, and the preset reference curve is used for representing the corresponding relation between the current density and the amplitude of bubble sound in a test membrane electrode under the condition that the test membrane electrode is not flooded; and according to a difference value between the current amplitude and the reference amplitude, determining whether the membrane electrode to be detected is flooded. Whether the membrane electrode is flooded by water or not is monitored in real time by using the amplitude of the bubble sound and the preset reference curve, so that the water flooding condition can be warned in time, and irreversible damage to the membrane electrode is avoided.

Description

Technical Field

[0001] The present application belongs to the field of fuel cell technology, and in particular, relates to a membrane electrode water management method, device and system. Background Art

[0002] Fuel cells convert chemical energy into electrical energy through hydrogen-oxygen reactions, and the byproduct is water, which can greatly reduce carbon dioxide emissions and dependence on fossil fuels, so they are widely used in vehicles. Fuel cells include membrane electrodes and bipolar plates. Among them, the water management of the membrane electrode has a crucial impact on the service life and performance of the fuel cell. Too little water will cause the proton conductivity of the proton exchange membrane to decrease, and too much water will cause the fuel cell to be flooded, causing problems such as gas shortage and reverse polarity, which will seriously damage the fuel cell.

[0003] At present, in the actual use and testing of fuel cells, it is still impossible to directly monitor the water content of the membrane electrode in the fuel cell in real time. It is difficult to detect local flooding in time, which can easily cause irreversible damage to the membrane electrode. Therefore, how to determine whether the membrane electrode is flooded in time is an urgent problem to be solved. Summary of the invention

[0004] The embodiments of the present application provide a membrane electrode water management method, device and system, which can timely determine whether the membrane electrode is flooded, at least to a certain extent, to avoid irreversible damage to the membrane electrode.

[0005] Other features and advantages of the present application will become apparent from the following detailed description, or may be learned in part by the practice of the present application.

[0006] According to a first aspect of an embodiment of the present application, a water management method for a membrane electrode is provided, comprising:

[0007] Acquiring the current current density of the membrane electrode to be tested and the current amplitude of the bubbling sound in the membrane electrode to be tested;

[0008] Determine a reference amplitude corresponding to the current current density according to a preset reference curve, wherein the preset reference curve is used to characterize the corresponding relationship between the current density and the amplitude of the bubbling sound in the test membrane electrode when the test membrane electrode is not flooded;

[0009] Whether the membrane electrode to be tested is flooded is determined according to the difference between the current amplitude and the reference amplitude.

[0010] In some embodiments, determining whether the membrane electrode to be tested is flooded according to the difference between the current amplitude and the reference amplitude includes:

[0011] When the difference between the current amplitude and the reference amplitude is within a first preset range, determining that the membrane electrode to be tested is not flooded;

[0012] When the difference between the current amplitude and the reference amplitude is within a second preset range, determining that the membrane electrode to be tested is partially flooded;

[0013] When the difference between the current amplitude and the reference amplitude is within a third preset range, it is determined that the membrane electrode to be tested is completely flooded, wherein the upper limit value of the first preset range, the upper limit value of the second preset range and the upper limit value of the third preset range increase sequentially.

[0014] In some embodiments, the first preset range is less than 10%, the second preset range is 10-30%, and the third preset range is greater than 30%.

[0015] In some embodiments, before determining the reference amplitude corresponding to the current current density according to the preset reference curve, the water management method further includes:

[0016] Performing current density pulling on the test membrane electrode under a preset humidity, and recording the amplitude of the bubbling sound in the test membrane electrode under different current densities, wherein the preset humidity is between 0% and 30%;

[0017] The preset reference curve is constructed according to the amplitude of the bubbling sound in the test membrane electrode under the different current densities.

[0018] In some embodiments, the step of applying current density loading to the test membrane electrode under a preset humidity condition includes:

[0019] Under the preset humidification condition, the temperature and back pressure of the test membrane electrode are controlled to be constant, and the test membrane electrode is subjected to current density pulling.

[0020] According to a second aspect of an embodiment of the present application, a membrane electrode water management device is provided, comprising a processor and a memory, wherein the memory stores computer program instructions that can be executed by the processor, and when the processor executes the computer program instructions, the steps of the method described in any one of the first aspects are implemented.

[0021] According to a third aspect of the embodiment of the present application, a membrane electrode water management system is provided, comprising: acoustic wax, a sound sensor, a preamplifier, an amplifier, a data acquisition card and the membrane electrode water management device described above; wherein,

[0022] The sound sensor is connected to the membrane electrode through the sound-conducting wax;

[0023] The sound sensor, preamplifier, amplifier, data acquisition card and membrane electrode water management equipment are connected in sequence.

[0024] In some embodiments, the acoustic sensor is disposed on the top of the cathode side flow field of the fuel cell where the membrane electrode is located.

[0025] In some embodiments, the bandwidth of the preamplifier ranges from 20 kHz to 5 MHz.

[0026] In some embodiments, the membrane electrode water management device is further used to acquire the bubbling sound collected by the data acquisition card, and perform fast Fourier transform on the bubbling sound to obtain the amplitude of the bubbling sound.

[0027] In the present application, the current current density of the membrane electrode to be tested and the current amplitude of the bubbling sound in the membrane electrode to be tested are obtained; the reference amplitude corresponding to the current current density is determined according to a preset reference curve, wherein the preset reference curve is used to characterize the corresponding relationship between the current density and the amplitude of the bubbling sound in the test membrane electrode when the test membrane electrode is not flooded; and whether the membrane electrode to be tested is flooded is determined according to the difference between the current amplitude and the reference amplitude. The amplitude of the bubbling sound and the preset reference curve are used to realize real-time monitoring of whether the membrane electrode is flooded, so as to provide timely warning of flooding and avoid irreversible damage to the membrane electrode.

[0028] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The drawings herein are incorporated into the specification and constitute a part of the specification, showing embodiments consistent with the present application, and together with the specification, are used to explain the principles of the present application. Obviously, the drawings described below are only some embodiments of the present application, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. In the drawings:

[0030] Figure 1 A schematic flow chart of a water management method for a membrane electrode in one embodiment is shown;

[0031] Figure 2 A schematic diagram of the structure of a water management system for a membrane electrode in one embodiment is shown;

[0032] Figure 3 Shows Figure 1 A schematic diagram of a preset reference curve;

[0033] Figure 4A schematic structural diagram of a water management device for a membrane electrode in one embodiment is shown. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0035] In addition, described feature, structure or characteristic can be combined in one or more embodiments in any suitable manner. In the following description, many specific details are provided to provide a full understanding of the embodiments of the present application. However, those skilled in the art will appreciate that the technical scheme of the present application can be put into practice without one or more of the specific details, or other methods, components, devices, steps, etc. can be adopted. In other cases, known methods, devices, realizations or operations are not shown or described in detail to avoid blurring the various aspects of the application.

[0036] The block diagrams shown in the accompanying drawings are merely functional entities and do not necessarily correspond to physically independent entities. That is, these functional entities may be implemented in software form, or in one or more hardware modules or integrated circuits, or in different networks and / or processor devices and / or microcontroller devices.

[0037] The flowcharts shown in the accompanying drawings are only exemplary and do not necessarily include all the contents and operations / steps, nor must they be executed in the order described. For example, some operations / steps can be decomposed, and some operations / steps can be combined or partially combined, so the actual execution order may change according to actual conditions.

[0038] In order to enable those skilled in the art to better understand the present application, the application scenarios involved in the present application are first briefly described.

[0039] The membrane electrode is composed of three parts: a proton exchange membrane, a catalyst layer, and a gas diffusion layer. It is the core part of the fuel cell and provides an efficient and stable place for the electrochemical reaction of hydrogen and oxygen. The accumulation of water in the membrane electrode is the result of electroosmotic resistance and reverse diffusion. When protons carry water droplets from the anode to the cathode through the proton exchange membrane, electroosmotic resistance occurs. Due to the water concentration gradient on the cathode and anode, water droplets move from the cathode to the anode, so reverse diffusion occurs. Both electroosmotic resistance and reverse diffusion are key factors in determining current density. How to balance these two factors at different current densities and control the overall water content in the membrane electrode of the fuel cell through external humidification, temperature and other conditions, and perform reasonable water management is extremely important.

[0040] In the actual use and testing of fuel cells, it is currently not possible to directly monitor the water content of the membrane electrode in the fuel cell in real time. It is difficult to detect local flooding in time, which can easily cause irreversible damage to the membrane electrode.

[0041] In the present application, the inventors have considered that the chemical reactions occurring in the fuel cell are accompanied by energy transfer, and some of the energy will be converted into acoustic signals. One possible sound source is the oscillation and friction between the bubbles generated by the electrochemical reaction between hydrogen and oxygen to form water on the cathode side. The formation rate of bubbles is closely related to the speed of the chemical reaction. A rapid chemical reaction will lead to a high formation rate of bubbles accompanied by rapid generation of bubbles, causing oscillation and friction between the bubbles, thereby increasing the decibel. Based on this, the inventors have modeled and verified the connection between the sound signal of the bubbles and the membrane electrode water management, and concluded that the sound signal of the bubbles can accurately reflect the flooding situation in the membrane electrode, and based on this, designed the membrane electrode water management method of the present application.

[0042] During the model simulation process, it can be assumed that the catalyst layer and membrane of the membrane electrode are at the same temperature, then the membrane conductivity can be calculated based on the water content of the catalyst layer, and the water content of the catalyst layer can be calculated based on the partial pressure of water vapor and the saturated water vapor pressure. The amount of water accumulated at the cathode relative to the anode can be calculated based on the thickness of the membrane and the electroosmotic drag coefficient, the water content in the membrane can be calculated based on the water activity in the channel under the anode, the main source of the sound signal is the oscillation of the bubbles and the friction between them, and the frequency of the sound signal can be calculated based on parameters such as the radius of the bubbles generated by the reaction. The calculation formulas for membrane conductivity, water content of the catalyst layer, water accumulation at the cathode relative to the anode, water content in the membrane, and the frequency of the sound signal are all input into the simulation software for model simulation, and the connection between the sound signal of the bubbles and the membrane electrode water management can be determined.

[0043] This application innovatively uses the amplitude of water bubble sound to manage the water of the membrane electrode, realizing real-time monitoring of whether the membrane electrode is flooded, so as to provide timely warning of flooding and avoid irreversible damage to the membrane electrode.

[0044] Figure 1 FIG. 1 is a flow chart of a water management method for a membrane electrode in one embodiment. Figure 1 As shown, in some embodiments, the membrane electrode water management method may include the following steps 101 to 103.

[0045] In step 101, the current current density of the membrane electrode to be tested and the current amplitude of the bubbling sound in the membrane electrode to be tested are obtained.

[0046] Figure 2 FIG. 1 shows a schematic diagram of a water management system for a membrane electrode in one embodiment. Figure 2 As shown, the water management system of the membrane electrode may include: sound-conducting wax 10, sound sensor 20, preamplifier 30, amplifier 40, data acquisition card 50 and membrane electrode water management equipment 60; wherein the sound sensor 20 is connected to the membrane electrode through the sound-conducting wax 10; the sound sensor 20, preamplifier 30, amplifier 40, data acquisition card 50 and membrane electrode water management equipment 60 are connected in sequence.

[0047] The membrane electrode water management method in this application can be applied to the membrane electrode water management device 60. The membrane electrode water management device 60 can obtain the current current density of the membrane electrode to be tested and the current amplitude of the water bubble sound in the membrane electrode to be tested in various ways, which is not limited in this embodiment of the application.

[0048] In some embodiments, the acoustic sensor 20 is disposed on the top of the cathode side flow field of the fuel cell where the membrane electrode is located.

[0049] By placing the sound sensor on the top of the cathode side flow field, it can be as close to the bubble sound source as possible, reducing noise interference. The sound-conducting wax 10 is generally a mixture of fatty acid salts, which plays a role in supporting the sound sensor 20 and providing necessary acoustic coupling.

[0050] In some embodiments, the bandwidth of the preamplifier 30 ranges from 20 kHz to 5 MHz.

[0051] It should be noted that, since the sound spectrum generated by the reaction is usually in the range of 20kHz to 1MHz, the selection of a preamplifier with the above bandwidth range can not only process all sound frequencies from the sound sensor 20, but also avoid other interference from the environment.

[0052] In some embodiments, the gain of the amplifier 40 can be switched in a range of 0 to 40 dB with a step of 1 dB, and the sampling interval of the data acquisition card 50 can be 200 ns.

[0053] In some embodiments, the membrane electrode water management device 60 is also used to obtain the water bubble sound collected by the data acquisition card 50, and perform fast Fourier transform on the water bubble sound to obtain the amplitude of the water bubble sound.

[0054] It can be understood that the bubbling sound is a time domain signal. The bubbling sound can be converted into a frequency domain signal using Fast Fourier Transform and then data analysis can be performed to obtain the corresponding frequency and amplitude.

[0055] In step 102, a reference amplitude corresponding to the current current density is determined according to a preset reference curve, wherein the preset reference curve is used to characterize the corresponding relationship between the current density and the amplitude of the bubbling sound in the test membrane electrode when the test membrane electrode is not flooded.

[0056] It can be understood that the test membrane electrode can be a membrane electrode of the same model and made of the same material as the membrane electrode to be tested.

[0057] Figure 3 Shows Figure 1 A schematic diagram of the preset reference curve in . Figure 3 The health curve in the figure is a preset reference curve, which can be obtained by testing the test membrane electrode without being flooded.

[0058] It should be understood that when the material of the test membrane electrode changes, or the test environment (such as current density, humidity, temperature and back pressure) changes, the preset reference curve will also change. The embodiments of the present application do not limit the specific trajectory of the preset reference curve.

[0059] In some embodiments, the test membrane electrode is subjected to current density loading under preset humidity, and the amplitude of the bubbling sound in the test membrane electrode under different current densities is recorded, wherein the preset humidity is between 0 and 30%; a preset reference curve is constructed based on the amplitude of the bubbling sound in the test membrane electrode under different current densities.

[0060] It should be noted that the preset humidification is low humidification, and the value of low humidification can be between 0 and 30%, so as to avoid the membrane electrode being flooded under high current density and ensure that the signal taken is not interfered by the flooding signal.

[0061] In the implementation process, in addition to limiting the humidity, the temperature and back pressure of the test membrane electrode can also be limited. That is, under the preset humidity, the temperature and back pressure of the test membrane electrode are controlled to be constant, and the current density is pulled on the test membrane electrode.

[0062] It is understood that when the fuel cell is working normally, hydrogen flows from the fuel cell to the air circuit, and the back pressure refers to the flow resistance that the hydrogen has to overcome in this process. By keeping the temperature and back pressure of the test membrane electrode constant, the frequency of the bubbling sound generated by the reaction can be kept the same, which is convenient for comparing the amplitude at this frequency.

[0063] In the implementation process, the raw materials can be used: TKK E50E catalyst, SGL22BB gas diffusion layer, GORE M788.12 proton exchange membrane, to prepare the test membrane electrode, the active area of ​​the test membrane electrode is 25cm 2 , the cathode Pt loading is 0.4 mg / cm 2 , the anode loading is 0.1 mg / cm 2 , and load it on a graphite fixture for power generation performance testing.

[0064] Under the condition that the temperature of the test membrane electrode is kept at 80℃, the back pressure of the cathode and anode is 150kPa / 150kPa, and the humidity of the cathode and anode is 30% / 30%, the test membrane electrode is subjected to current density pulling, so that it can be pulled at different current densities (0, 500, 1000, 2000, 2500mA / cm 2 ) was tested to monitor the changes in the bubble sound at different current densities. After fast Fourier transform, the results are shown in Table 1 below:

[0065] Table 1

[0066] <![CDATA[Current density - 30% RH / (mA / cm 2 )]]> Characteristic frequency / kHz Amplitude / mV Whether the voltage fluctuates (whether it is flooded) 0 538 340 no 500 538 418 no 1000 538 434 no 2000 538 496 no 2500 538 520 no

[0067] By matching the current density and amplitude in Table 1 one by one and connecting them, we can get Figure 2 The health curve shown in .

[0068] In step 103, it is determined whether the membrane electrode to be tested is flooded according to the difference between the current amplitude and the reference amplitude.

[0069] In some embodiments, when the difference between the current amplitude and the reference amplitude is within a first preset range, it can be determined that the membrane electrode to be tested is within a first preset range; when the difference between the current amplitude and the reference amplitude is within a second preset range, it can be determined that the membrane electrode to be tested is partially flooded; when the difference between the current amplitude and the reference amplitude is within a third preset range, it can be determined that the membrane electrode to be tested is completely flooded, wherein the upper limit value of the first preset range, the upper limit value of the second preset range and the upper limit value of the third preset range increase sequentially.

[0070] It is understandable that by setting different preset ranges, the water flooding conditions in the membrane electrode to be tested can be distinguished. Specifically, the first preset range can be less than 10%, the second preset range can be 10-30%, and the third preset range can be greater than 30%.

[0071] In order to verify the water management method of the membrane electrode of the present application, during the test, the humidification can be changed to 100% to simulate the flooding phenomenon of the test membrane electrode under high current density, and the same temperature and back pressure are maintained to monitor the changes in the bubbling sound of the test membrane electrode. After fast Fourier transform, the results are shown in Table 2 below:

[0072] Table 2

[0073] <![CDATA[Current density - 100% RH (mA / cm 2 )]]> Characteristic frequency amplitude difference / % Whether the voltage fluctuates (whether it is flooded) 0 538 348 2.4 no 500 538 455 8.9 no 1000 538 463 6.7 no 2000 538 346 30.2 yes 2500 538 312 40.0 yes

[0074] By matching the current density and amplitude in Table 2 one by one and connecting them, we can get Figure 2 The high humidity curve shown in .

[0075] By comparing these two curves, it can be found that under the same temperature and back pressure, the characteristic frequency of the bubbling sound generated by the bubbling activity generated by the electrochemical reaction remains the same. When the test membrane electrode is not flooded, as the current density continues to increase, the bubbling rate and friction intensify, the amplitude corresponding to the characteristic frequency continues to increase.

[0076] By increasing the humidity, the water generated at high current density cannot be removed in time to simulate flooding. 2 Under the current density, the amplitude corresponding to the characteristic frequency differs by more than 30% compared with the "healthy curve", and obvious water flooding was found in the membrane electrode test, which illustrates the effectiveness of the water management method of the membrane electrode of the present application.

[0077] The embodiment of the present application obtains the current current density of the membrane electrode to be tested and the current amplitude of the bubbling sound in the membrane electrode to be tested; determines the reference amplitude corresponding to the current current density according to a preset reference curve, wherein the preset reference curve is used to characterize the corresponding relationship between the current density and the amplitude of the bubbling sound in the membrane electrode to be tested when the membrane electrode to be tested is not flooded; determines whether the membrane electrode to be tested is flooded according to the difference between the current amplitude and the reference amplitude. The amplitude of the bubbling sound and the preset reference curve are used to realize real-time monitoring of whether the membrane electrode is flooded, so as to provide a timely warning of the flooding situation and avoid irreversible damage to the membrane electrode.

[0078] The following describes an apparatus embodiment of the present application, which can be used to implement the membrane electrode water management method in the above-mentioned embodiment of the present application. For details not disclosed in the apparatus embodiment of the present application, please refer to the above-mentioned embodiment of the membrane electrode water management method of the present application.

[0079] The water management device of the membrane electrode of the embodiment of the present application may include: a data acquisition module, an amplitude determination module and a flooding judgment module, wherein the data acquisition module is used to obtain the current current density of the membrane electrode to be tested and the current amplitude of the bubbling sound in the membrane electrode to be tested; the amplitude determination module is used to determine the reference amplitude corresponding to the current current density according to a preset reference curve, wherein the preset reference curve is used to characterize the correspondence between the current density and the amplitude of the bubbling sound in the test membrane electrode when the test membrane electrode is not flooded; the flooding judgment module is used to determine whether the membrane electrode to be tested is flooded according to the difference between the current amplitude and the reference amplitude.

[0080] In some embodiments, the flooding judgment module can also be used to determine that the membrane electrode to be tested is not flooded when the difference value between the current amplitude and the reference amplitude is within a first preset range; to determine that the membrane electrode to be tested is partially flooded when the difference value between the current amplitude and the reference amplitude is within a second preset range; and to determine that the membrane electrode to be tested is completely flooded when the difference value between the current amplitude and the reference amplitude is within a third preset range, wherein the upper limit value of the first preset range, the upper limit value of the second preset range and the upper limit value of the third preset range increase sequentially.

[0081] In some embodiments, the first preset range is less than 10%, the second preset range is 10-30%, and the third preset range is greater than 30%.

[0082] In some embodiments, the amplitude determination module can also be used to perform current density loading on the test membrane electrode under preset humidity, and record the amplitude of the bubbling sound in the test membrane electrode under different current densities, wherein the preset humidity is between 0 and 30%; and construct the preset reference curve based on the amplitude of the bubbling sound in the test membrane electrode under the different current densities.

[0083] In some embodiments, the amplitude determination module may also be used to control the temperature and back pressure of the test membrane electrode to be constant under the preset humidification condition, and to perform current density loading on the test membrane electrode.

[0084] Based on the same inventive concept, the present application also provides a membrane electrode water management device, referring to Figure 4, showing a schematic diagram of the structure of the membrane electrode water management device in an embodiment of the present application, the membrane electrode water management device includes one or more memories 404, one or more processors 402 and at least one computer program (computer program instruction) stored in the memory 404 and executable on the processor 402, and the processor 402 implements the method described above when executing the computer program.

[0085] Among them, Figure 4 In the embodiment of the present invention, a bus architecture (represented by bus 400) is shown, which may include any number of interconnected buses and bridges, and bus 400 links various circuits including one or more processors represented by processor 402 and memory represented by memory 404. Bus 400 may also link various other circuits such as peripherals, voltage regulators, and power management circuits, which are well known in the art and are therefore not further described herein. Bus interface 405 provides an interface between bus 400 and receiver 401 and transmitter 403. Receiver 401 and transmitter 403 may be the same element, namely a transceiver, providing a unit for communicating with various other devices over a transmission medium. Processor 402 is responsible for managing bus 400 and general processing, while memory 404 may be used to store data used by processor 402 when performing operations.

[0086] Based on the same inventive concept, an embodiment of the present application provides a membrane electrode water management system, comprising: sound-conducting wax, a sound sensor, a preamplifier, an amplifier, a data acquisition card and the above-mentioned membrane electrode water management equipment; wherein the sound sensor is connected to the membrane electrode through the sound-conducting wax; the sound sensor, preamplifier, amplifier, data acquisition card and the membrane electrode water management equipment are connected in sequence.

[0087] In some embodiments, the acoustic sensor is disposed on the top of the cathode side flow field of the fuel cell where the membrane electrode is located.

[0088] In some embodiments, the bandwidth of the preamplifier ranges from 20 kHz to 5 MHz.

[0089] In some embodiments, the membrane electrode water management device is further used to acquire the bubbling sound collected by the data acquisition card, and perform fast Fourier transform on the bubbling sound to obtain the amplitude of the bubbling sound.

[0090] Based on the same inventive concept, an embodiment of the present application provides a computer-readable storage medium, in which computer program instructions are stored. When the computer program instructions are executed by a processor, the processor is prompted to implement the steps of the method as described above.

[0091] The functions described herein may be implemented in hardware, software executed by a processor, firmware, or any combination thereof. If implemented in software executed by a processor, the functions may be stored as one or more instructions or codes on a computer-readable medium or transmitted via a computer-readable medium. Other examples and implementations are within the scope and spirit of the present application and the appended claims. For example, due to the nature of software, the functions described above may be implemented using software executed by a processor, hardware, firmware, hard wiring, or a combination of any of these. In addition, each functional unit may be integrated into a processing unit, each unit may exist physically separately, or two or more units may be integrated into one unit.

[0092] In the several embodiments provided in this application, it should be understood that the disclosed technical content can be implemented in other ways. Among them, the device embodiments described above are only schematic. For example, the division of the units can be a logical function division. There may be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of units or modules, which can be electrical or other forms.

[0093] The units described as separate components may or may not be physically separated, and the components of the control device may or may not be physical units, that is, they may be located in one place or distributed in multiple units. Some or all of the units may be selected according to actual needs to achieve the purpose of the present embodiment.

[0094] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application can be essentially or partly or all or partly embodied in the form of a software product that contributes to the prior art. The computer software product is stored in a storage medium, including several instructions for a computer device (which can be a personal computer, a server or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage medium includes: U disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), mobile hard disk, disk or optical disk, etc., which can store computer program instructions.

[0095] The above description is only an embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent substitution, improvement, etc. made within the spirit and principle of the present application shall be included in the scope of the claims of the present application.

Claims

1. A water management method for a membrane electrode, It is characterized in that include: Acquiring the current current density of the membrane electrode to be tested and the current amplitude of the bubbling sound in the membrane electrode to be tested; Determine a reference amplitude corresponding to the current current density according to a preset reference curve, wherein the preset reference curve is used to characterize the corresponding relationship between the current density and the amplitude of the bubbling sound in the test membrane electrode when the test membrane electrode is not flooded; Whether the membrane electrode to be tested is flooded is determined according to the difference between the current amplitude and the reference amplitude.

2. The water management method of the membrane electrode according to claim 1, It is characterized in that The step of determining whether the membrane electrode to be tested is flooded according to the difference between the current amplitude and the reference amplitude comprises: When the difference between the current amplitude and the reference amplitude is within a first preset range, determining that the membrane electrode to be tested is not flooded; When the difference between the current amplitude and the reference amplitude is within a second preset range, determining that the membrane electrode to be tested is partially flooded; When the difference between the current amplitude and the reference amplitude is within a third preset range, it is determined that the membrane electrode to be tested is completely flooded, wherein the upper limit value of the first preset range, the upper limit value of the second preset range and the upper limit value of the third preset range increase sequentially.

3. The water management method of the membrane electrode according to claim 2, It is characterized in that The first preset range is less than 10%, the second preset range is 10-30%, and the third preset range is greater than 30%.

4. The water management method of the membrane electrode according to claim 2, It is characterized in that Before determining the reference amplitude corresponding to the current current density according to the preset reference curve, the water management method further includes: Performing current density pulling on the test membrane electrode under a preset humidity, and recording the amplitude of the bubbling sound in the test membrane electrode under different current densities, wherein the preset humidity is between 0% and 30%; The preset reference curve is constructed according to the amplitude of the bubbling sound in the test membrane electrode under the different current densities.

5. The water management method of the membrane electrode according to claim 4, It is characterized in that The step of performing current density loading on the test membrane electrode under a preset humidity condition comprises: Under the preset humidification condition, the temperature and back pressure of the test membrane electrode are controlled to be constant, and the test membrane electrode is subjected to current density pulling.

6. A membrane electrode water management device, comprising a processor and a memory, It is characterized in that The memory stores computer program instructions that can be executed by the processor, and when the processor executes the computer program instructions, the steps of the method according to any one of claims 1 to 5 are implemented.

7. A water management system for a membrane electrode, include: Sound-conducting wax, sound sensor, preamplifier, amplifier, data acquisition card and membrane electrode water management equipment according to claim 6; wherein, The sound sensor is connected to the membrane electrode through the sound-conducting wax; The sound sensor, preamplifier, amplifier, data acquisition card and membrane electrode water management equipment are connected in sequence.

8. The water management system of the membrane electrode according to claim 7, It is characterized in that The sound sensor is arranged on the top of the cathode side flow field of the fuel cell where the membrane electrode is located.

9. The water management system of the membrane electrode according to claim 7, It is characterized in that The bandwidth range of the preamplifier is 20kHz to 5MHz.

10. The water management system of the membrane electrode according to claim 7, It is characterized in that The membrane electrode water management device is also used to obtain the bubbling sound collected by the data acquisition card, and perform fast Fourier transform on the bubbling sound to obtain the amplitude of the bubbling sound.

Images