Device and method for monitoring moisture content of membrane electrode of fuel cell

Abstract

The invention relates to a device and a method for monitoring the moisture content of a membrane electrode of a fuel cell. The device comprises a PCB substrate, a detection bonding pad and N first resistors, the detection bonding pad comprises N sub bonding pads, the number of the first resistors is N, and the N sub bonding pads are fixed on the PCB substrate; the N sub bonding pads are used for obtaining current signals of different areas in a membrane electrode unit in the fuel cell; for each sub-pad in the N sub-pads, one side, close to the PCB substrate, of the sub-pad is electrically connected with a first end of a first resistor through a through hole reserved in the PCB substrate; the second end of each first resistor is connected with an impedance tester through a line; the impedance tester is used for generating an impedance spectrum according to a voltage signal input by the first resistor, so as to generate moisture content distribution information based on the impedance spectrum. According to the scheme, the water content monitoring efficiency and accuracy of the membrane electrode unit are improved.

Description

Technical Field

[0001] The present disclosure relates to the technical field of battery detection, and in particular to a device and method for monitoring the moisture content of a membrane electrode of a fuel cell. Background Art

[0002] In the related technologies, the proton exchange membrane fuel cell PEMFC has become an important research object in the field of new energy due to its high operating efficiency and zero pollution emissions. Due to the large active area of ​​the proton exchange membrane, the reaction mechanism of the fuel cell is complex, and the electrochemical reactions in different areas may be inconsistent, resulting in different water return amounts in different areas of the proton exchange membrane. However, the existing fuel cell detection method requires breaking the closed structure of the fuel cell, making it difficult to achieve real-time monitoring of the water content of the internal proton exchange membrane during the operation of the fuel cell, and it is difficult to obtain real-time changing water content monitoring information, resulting in poor battery detection results. Summary of the invention

[0003] In order to overcome the problems existing in the related art, the present disclosure provides a device and method for monitoring the moisture content of a membrane electrode of a fuel cell.

[0004] According to a first aspect of an embodiment of the present disclosure, a membrane electrode moisture content monitoring device for a fuel cell is provided, comprising a PCB substrate, a detection pad and a first resistor, wherein the detection pad comprises N sub-pads, and the first resistor has N number, wherein:

[0005] The N sub-pads are fixed on the PCB substrate; the N sub-pads are used to obtain current signals of different regions in the membrane electrode unit of the fuel cell; N is an integer greater than 1;

[0006] For each of the N sub-pads, a side of the sub-pad close to the PCB substrate is electrically connected to a first end of a first resistor through a through hole reserved on the PCB substrate;

[0007] The second end of each first resistor is connected to an impedance tester through a line; the impedance tester is used to generate an impedance spectrum according to a voltage signal input by the first resistor, so as to generate water content distribution information based on the impedance spectrum.

[0008] In some embodiments of the present application, N signal amplification elements are also included, wherein:

[0009] A signal amplifying element is connected to the line between each first resistor and the impedance tester;

[0010] The input end of the signal amplifying element is connected to the second end of the first resistor, and the output end of the signal amplifying element is connected to the impedance tester.

[0011] In some embodiments of the present application, the N sub-pads are all rectangular and have the same area, and the N sub-pads are arranged in an array on the PCB substrate; the outer contour of the detection pad corresponds to the shape of the area to be detected of the membrane electrode unit.

[0012] In some embodiments of the present application, the outer contour of the PCB substrate corresponds to the outer contour of the membrane electrode unit in the fuel cell.

[0013] In some embodiments of the present application, the PCB substrate is provided with bolt mounting holes for fixing to the membrane electrode unit.

[0014] In some embodiments of the present application, a plurality of capacitance spaces for installing the sub-pad, the first resistor and the signal amplifying element are provided on the PCB substrate; a sub-pad, a first resistor and a signal amplifying element are placed in each capacitance space in sequence; the sub-pad, the first resistor and the signal amplifying element in the same capacitance space are connected in sequence through line 9.

[0015] In some embodiments of the present application, a lead-out metal sheet is installed on one side of each volume space away from the sub-pad, a plurality of signal output circuits are arranged on the PCB substrate, an input end of each signal output circuit is connected to a lead-out metal sheet, and an output end of each signal output circuit is connected to the impedance tester.

[0016] According to a second aspect of an embodiment of the present disclosure, a method for monitoring the moisture content of a membrane electrode of a fuel cell is provided. The device for monitoring the moisture content of a membrane electrode of a fuel cell according to any one of the first aspects comprises:

[0017] Controlling the fuel cell to be tested to be in a running state;

[0018] The impedance detector is controlled to receive voltage signals outputted by N first resistors of the membrane electrode moisture content monitoring device of the fuel cell; wherein the membrane electrode moisture content monitoring device of the fuel cell is arranged inside the shell of the fuel cell, and each of the first resistors is connected to the impedance tester through a line running through the shell; the voltage signal is obtained after the first resistor converts the current signal collected by the sub-pad; the impedance detector uses different signal transmission interfaces to receive the N voltage signals;

[0019] Controlling the impedance detector to convert the collected N voltage signals into impedance spectra respectively;

[0020] Obtaining identification information of the signal transmission interface corresponding to each of the N voltage signals;

[0021] According to the preset mapping relationship between the identification information and the relative position coordinates, the regional position information corresponding to each impedance spectrum is determined, so as to determine the water content of different regions in the membrane electrode unit according to the impedance spectrum and the corresponding regional position information.

[0022] In some embodiments of the present application, after determining the regional position information corresponding to each impedance spectrum according to the mapping relationship between the identification information and the relative position coordinates, the method may further include:

[0023] Perform fast Fourier transform processing on each impedance spectrum to obtain a water content distribution map corresponding to each impedance spectrum;

[0024] The water content distribution map is spliced ​​according to the regional position information corresponding to each impedance spectrum to obtain the water content distribution map of the membrane electrode unit.

[0025] According to a third aspect of an embodiment of the present disclosure, an electronic device includes: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the computer program, the method described in any one of the second aspects is implemented.

[0026] According to a fourth aspect of an embodiment of the present disclosure, there is provided a computer-readable storage medium on which a computer program is stored. When the computer program is executed by a processor, the method according to any one of the second aspects is implemented.

[0027] According to a fifth aspect of an embodiment of the present disclosure, a computer program product is provided, comprising a computer program, wherein the computer program implements the method as described in any one of the second aspects when executed by a processor.

[0028] The technical solution provided by the embodiments of the present disclosure may include the following beneficial effects: by setting a plurality of sub-pads corresponding to the membrane electrode of the fuel cell to be tested on the PCB substrate, the current signal of different positions of the membrane electrode unit can be obtained by region, and after the current signal is converted into a voltage signal through a first resistor, an impedance tester is used to convert the voltage signal into an impedance spectrum, so that water content distribution information can be generated based on the impedance spectrum. The membrane electrode moisture content monitoring device of the fuel cell has a simple structure and occupies a small space. When testing the water content of the fuel cell, the device can be directly placed in the fuel cell, thereby ensuring the sealing of the fuel cell, thereby realizing real-time monitoring of different areas of the membrane electrode unit, and effectively improving the efficiency and accuracy of the membrane electrode unit moisture content monitoring.

[0029] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0031] Figure 1 It is a schematic diagram of a device for monitoring the moisture content of a membrane electrode of a fuel cell according to an exemplary embodiment.

[0032] Figure 2 It is a cross-sectional schematic diagram of a device for monitoring the moisture content of a membrane electrode of a fuel cell according to an embodiment of the present disclosure.

[0033] Figure 3 is a schematic cross-sectional view of a fuel cell according to an embodiment of the present disclosure.

[0034] Figure 4 is an impedance spectrum shown according to an embodiment of the present disclosure.

[0035] Figure 5 is a water content distribution diagram shown in an embodiment of the present disclosure.

[0036] Figure 6 The present invention is a flow chart showing a method for monitoring the moisture content of a membrane electrode for a fuel cell according to an exemplary embodiment.

[0037] Figure 7 The block diagram of a device for monitoring the water content of a membrane electrode of a fuel cell is shown according to an exemplary embodiment.

[0038] Reference numerals

[0039] 1. PCB substrate; 2. First resistor; 3. Bolt mounting hole; 4. Signal output circuit; 5. Sub-pad; 6. Lead-out metal sheet; 7. Capacitor space; 8. Signal amplifying element; 9. Circuit; 10. Shell; 11. Membrane electrode unit. DETAILED DESCRIPTION

[0040] Exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present invention. Instead, they are merely examples of devices and methods consistent with some aspects of the present invention as detailed in the appended claims.

[0041] The terms used in the disclosed embodiments are only for the purpose of describing specific embodiments, and are not intended to limit the disclosed embodiments. The singular forms "a", "an" and "the" used in the disclosed embodiments and the appended claims are also intended to include plural forms, unless the context clearly indicates other meanings.

[0042] It should be understood that although the terms first, second, third, etc. may be used to describe various information in the disclosed embodiments, these information should not be limited to these terms. These terms are only used to distinguish the same type of information from each other. For example, without departing from the scope of the disclosed embodiments, the first information may also be referred to as the second information, and similarly, the second information may also be referred to as the first information. Depending on the context, the words "if" and "if" as used herein may be interpreted as "at" or "when" or "in response to determination".

[0043] In addition, various forms of processes shown in the embodiments of the present disclosure may be used to reorder, add or delete steps. For example, the steps described in the present application may be performed in parallel, sequentially or in different orders, as long as the desired results of the technical solution disclosed in the present application can be achieved, and this document does not limit this.

[0044] In the related technology, the proton exchange membrane fuel cell PEMFC has become an important research object in the field of new energy due to its advantages such as high operating efficiency and zero pollution emissions. Due to the large active area of ​​the proton exchange membrane, the reaction mechanism of the fuel cell is complex, and the electrochemical reactions in different areas may be inconsistent, resulting in different water returns in different areas of the proton exchange membrane. Especially in the actual large-size battery stack, local flooding and drying may occur simultaneously, which directly affects the performance and service life of the fuel cell. However, the existing fuel cell detection method requires breaking the closed structure of the fuel cell, making it difficult to achieve real-time monitoring of the water content of the internal proton exchange membrane during the operation of the fuel cell, and it is difficult to obtain real-time changing water content monitoring information, resulting in poor battery detection effect. In addition, the invasive measurement method will change the internal reaction environment of the battery, increase the difficulty of production, and affect the working performance of the fuel cell.

[0045] In order to solve the above problems, the present disclosure provides a membrane electrode moisture content monitoring device and method for a fuel cell. By setting a plurality of sub-pads corresponding to the membrane electrode of the fuel cell to be tested on a PCB substrate, the current signals of different positions of the membrane electrode unit can be obtained in different regions. After the current signal is converted into a voltage signal through a first resistor, an impedance tester is used to convert the voltage signal into an impedance spectrum, so that water content distribution information can be generated based on the impedance spectrum. The membrane electrode moisture content monitoring device for the fuel cell has a simple structure and occupies a small space. When testing the water content of the fuel cell, the device can be directly placed in the fuel cell, thereby ensuring the sealing of the fuel cell, thereby realizing real-time monitoring of different areas of the membrane electrode unit, and effectively improving the efficiency and accuracy of the membrane electrode unit moisture content monitoring.

[0046] Figure 1FIG. 1 is a schematic diagram showing a structure of a device for monitoring the water content of a membrane electrode of a fuel cell according to an exemplary embodiment. Figure 1 As shown, it should be noted that the membrane electrode moisture content monitoring device of the fuel cell in the embodiment of the present application is applied to the membrane electrode moisture content monitoring method of the fuel cell.

[0047] like Figure 1 , Figure 2 As shown, the device may include a PCB substrate 1, a detection pad and a first resistor 2, the detection pad includes N sub-pads 5, and the first resistor 2 has N number.

[0048] Wherein: N sub-pads 5 are fixed on the PCB substrate 1; N sub-pads 5 are used as follows Figure 3 The current signals of different regions in the membrane electrode unit 11 of the fuel cell are shown; N is an integer greater than 1;

[0049] For each of the N sub-pads 5, a side of the sub-pad 5 close to the PCB substrate 1 is electrically connected to a first end of a first resistor 2 through a through hole reserved on the PCB substrate 1;

[0050] The second end of each first resistor 2 is connected to an impedance tester through a line; the impedance tester is used to generate an impedance spectrum according to the voltage signal input by the first resistor 2, so as to generate moisture content distribution information based on the impedance spectrum.

[0051] In one embodiment, in order to be able to detect the moisture content of different areas of the membrane electrode unit 11, it is necessary to set a plurality of sub-pads 5 on the PCB substrate 1. The detection pad formed by the plurality of sub-pads 5 can cover the entire area to be detected of the membrane electrode unit 11, thereby ensuring the integrity of the collected data.

[0052] As an example, the device can be installed at the corresponding position of one of the membrane electrode units 11 in the fuel cell, the detection pad is arranged in contact with the area to be detected of the membrane electrode unit 11, and the device is connected to the impedance detector outside the fuel cell through a line. When the fuel cell is in operation, each first resistor 2 collects the current signal at the corresponding position of the membrane electrode, transmits the current signal to the first resistor 2, and the first resistor 2 converts the current signal into a voltage signal, and then transmits the voltage signal to the impedance tester. The impedance tester generates an impedance spectrum according to the voltage signal, and thus generates water content distribution information according to the impedance spectrum. The impedance spectrum is as follows: Figure 4 shown.

[0053] In some embodiments of the present application, the device further includes N signal amplifying elements 8, wherein:

[0054] A signal amplifying element 8 is connected to the line between each first resistor 2 and the impedance tester;

[0055] The input end of the signal amplifying element 8 is connected to the second end of the first resistor 2 , and the output end of the signal amplifying element 8 is connected to the impedance tester.

[0056] It can be understood that the use of a signal amplification unit to instantly amplify the voltage signal avoids signal loss and interference during transmission, thereby improving the accuracy of the monitoring result.

[0057] In one example, the insulating layer material of the line between the first resistor 2 and the impedance tester except the joint may be polytetrafluoroethylene.

[0058] In some embodiments of the present application, the N sub-pads 5 are all rectangular, and the areas of the N sub-pads 5 are the same, and the N sub-pads 5 are arranged in an array on the PCB substrate 1; the outer contour of the detection pad corresponds to the shape of the area to be detected of the membrane electrode unit 11.

[0059] It can be understood that the smaller the spacing between the multiple sub-pads 5, the more accurate the collected signal. Therefore, Yuxing's sub-pads 5 can be used to collect current signals, thereby reducing the spacing between the sub-pads 5. In addition, all sub-pads 5 are designed with the same size, which can ensure the theoretical consistency of the total resistance of all measurement circuits.

[0060] In one example, a detection pad with 16 partitions (a 4*4 array of sub-pads 5) may be designed to realize the function of collecting current signals in different regions.

[0061] In some embodiments of the present application, the outer contour of the PCB substrate 1 corresponds to the outer contour of the membrane electrode unit 11 in the fuel cell.

[0062] It should be noted that the membrane electrode moisture content monitoring device for the fuel cell proposed in the embodiment of the present application can be used for data monitoring during the online testing process of the fuel cell stack and the vehicle-mounted system. Therefore, the outer contour of the PCB substrate 1 is designed to be the same shape as the membrane electrode of the fuel cell. The membrane electrode moisture content monitoring device for the fuel cell can be directly inserted into the fuel cell stack as one of the membrane electrode units 11 of the fuel cell, thereby eliminating the need to install specific separators or seals, thereby improving the convenience of monitoring the moisture content of the membrane electrode.

[0063] In addition, since the fuel cell stack includes a plurality of adjacent membrane electrode units 11, the outer contour of the PCB substrate 1 is designed to be the same shape as the membrane electrode of the fuel cell, which can also avoid the presence of gaps between adjacent membrane electrode units 11 due to the installation of the membrane electrode moisture content monitoring device of the fuel cell, thereby avoiding affecting the normal operation of the fuel cell.

[0064] In some embodiments of the present application, bolt mounting holes 3 for fixing the membrane electrode unit 11 are provided on the PCB substrate 1 .

[0065] It is understandable that the fuel cell membrane electrode moisture content monitoring device can be fixed to the membrane electrode unit 11 to be tested by bolts, so as to avoid the membrane electrode unit 11 and the device being misaligned during the detection process, resulting in inaccurate detection results.

[0066] In some embodiments of the present application, a plurality of capacitive spaces 7 for mounting sub-pads 5, a first resistor 2 and a signal amplifying element 8 are provided on the PCB substrate 1; a sub-pad 5, a first resistor 2 and a signal amplifying element 8 are placed in sequence in each capacitive space 7; the sub-pads 5, the first resistor 2 and the signal amplifying element 8 in the same capacitive space 7 are connected in sequence through lines.

[0067] It can be understood that encapsulating the sub-pad 5, the first resistor 2 and the signal amplifying element 8 inside the PCB substrate 1 can reduce the overall thickness of the device as much as possible, thereby avoiding the appearance of gaps between the device and the adjacent membrane electrode unit 11, thereby ensuring that the fuel cell can operate normally during the detection process.

[0068] In addition, encapsulating the sub-pad 5, the first resistor 2 and the signal amplifying element 8 inside the PCB substrate 1 can also shorten the transmission distance of the signal in the circuit, reduce the transmission loss, and improve the efficiency and accuracy of signal transmission.

[0069] In some embodiments of the present application, a lead-out metal sheet 6 is installed on the side of each volume space 7 away from the sub-pad 5, and a plurality of signal output lines 4 are arranged on the PCB substrate 1. The input end of each signal output line 4 is connected to a lead-out metal sheet 6, and the output end of each signal output line 4 is connected to an impedance tester.

[0070] In one example, if Figure 2 As shown, a plurality of sub-spaces may be provided in the capacitive space 7, and the sub-pad 5, the first resistor 2, the signal amplifying element 8 and the lead-out metal sheet 6 are respectively arranged in different sub-spaces, and the sub-pad 5, the first resistor 2, the signal amplifying element 8 and the lead-out metal sheet 6 are connected by lines, and the lines are arranged in through holes reserved between adjacent sub-spaces.

[0071] In one embodiment, a voltage signal is output by connecting the lead-out metal sheet 6 to an output line disposed on the PCB substrate 1, thereby replacing direct connection with wires and further avoiding the formation of gaps between the PCB substrate 1 and the adjacent membrane electrode unit 11, thereby ensuring that the fuel cell can operate normally during the detection process.

[0072] As an example, a surface mounting process can be used to improve the integration of the sensor and shorten the current path. The design of each volume space 7 and the via method are consistent.

[0073] In some embodiments of the present application, a four-wire connection method may be used to improve the measurement accuracy of the signal.

[0074] According to the fuel cell membrane electrode moisture content monitoring device proposed in the embodiment of the present application, by setting a plurality of sub-pads corresponding to the fuel cell membrane electrode to be tested on the PCB substrate, the current signal of the membrane electrode unit at different positions can be obtained in different regions. After the current signal is converted into a voltage signal through a first resistor, an impedance tester is used to convert the voltage signal into an impedance spectrum, so that the moisture content distribution information can be generated based on the impedance spectrum. The fuel cell membrane electrode moisture content monitoring device has a simple structure and occupies a small space. When testing the moisture content of the fuel cell, the device can be directly placed in the fuel cell, thereby ensuring the sealing of the fuel cell, and then realizing real-time monitoring of different regions of the membrane electrode unit, effectively improving the efficiency and accuracy of the membrane electrode unit moisture content monitoring. In addition, the PCB design process of the fuel cell membrane electrode moisture content monitoring device avoids the buried resistance process, controls the cost, and takes maintainability into consideration, increasing the feasibility of actual engineering applications.

[0075] Figure 6 FIG. 1 is a flow chart showing a method for monitoring the water content of a membrane electrode of a fuel cell according to an exemplary embodiment. Figure 6 The method is applied to a membrane electrode moisture content monitoring device for a fuel cell proposed in some embodiments of the present application, and the method may include the following steps:

[0076] Step 601, controlling the fuel cell to be tested to be in a running state;

[0077] Step 602, controlling the impedance detector to receive the voltage signals outputted by the N first resistors 2 of the membrane electrode moisture content monitoring device of the fuel cell; wherein the membrane electrode moisture content monitoring device of the fuel cell is arranged inside the housing 10 of the fuel cell, and each first resistor 2 is connected to the impedance tester through a line running through the housing 10; the voltage signal is obtained after the first resistor 2 converts the current signal collected by the sub-pad 5; the impedance detector uses different signal transmission interfaces to receive the N voltage signals;

[0078] Step 603, controlling the impedance detector to convert the collected N voltage signals into impedance spectra respectively;

[0079] Step 604, obtaining identification information of the signal transmission interface corresponding to each of the N voltage signals;

[0080] Step 605 , determining the regional position information corresponding to each impedance spectrum according to the preset mapping relationship between the identification information and the relative position coordinates, so as to determine the water content of different regions in the membrane electrode unit 11 according to the impedance spectrum and the corresponding regional position information.

[0081] In one embodiment, in order to distinguish which area of ​​the membrane electrode unit 11 to be tested the different voltage signals correspond to, the collected voltage signals can be transmitted using different signal transmission interfaces, so that the voltage signals can be distinguished according to the identifiers of different signal transmission interfaces, and the mapping relationship between different identifiers and different regional positions of the membrane electrode unit 11 to be tested can be pre-set. Since the shape of the detection area of ​​the membrane electrode unit 11 to be tested corresponds to the overall shape of the detection pad, the above mapping relationship is also the mapping relationship between the identifier and the different sub-pads 5. Therefore, after the collected N voltage signals are converted into impedance spectra respectively, the regional position information corresponding to each impedance spectrum can be determined according to the above mapping relationship, so as to determine the water content of different areas in the membrane electrode unit 11 according to the impedance spectrum and the corresponding regional position information, thereby realizing the acquisition of the water content of different positions of the membrane electrode by region, and improving the accuracy of the water content detection of the membrane electrode unit 11.

[0082] In some embodiments of the present application, after determining the regional position information corresponding to each impedance spectrum based on the mapping relationship between the identification information and the relative position coordinates, the operation strategy of the fuel cell can also be optimized according to the water content at different positions of the membrane electrode, thereby improving the performance of the fuel cell.

[0083] In some embodiments of the present application, after determining the regional position information corresponding to each impedance spectrum according to the mapping relationship between the identification information and the relative position coordinates, the method may further include:

[0084] Perform fast Fourier transform processing on each impedance spectrum to obtain a water content distribution map corresponding to each impedance spectrum;

[0085] The water content distribution map is spliced ​​according to the regional position information corresponding to each impedance spectrum to obtain the water content distribution map of the membrane electrode unit 11.

[0086] In one embodiment, the impedance spectrum is converted into a water content distribution map by fast Fourier transform, and the water content distribution map is spliced ​​according to the regional position information corresponding to each impedance spectrum to obtain the following: Figure 5 The water content distribution diagram of the membrane electrode unit 11 shown realizes the visualization of the water content.

[0087] Regarding the device in the above embodiment, the specific manner in which each module performs operations has been described in detail in the embodiment of the method, and will not be elaborated here.

[0088] In some embodiments of the present application, a sampling method that can be used is to define a sampling start point and a sampling duration for each sub-pad 5 respectively.

[0089] As a possible example, during the test, the bipolar plates and membrane electrodes can be neatly stacked on the stacking machine. During this period, the membrane electrode moisture content monitoring device of the fuel cell is placed in the middle of the stack, the end plate of the fuel cell is installed, the whole stack is pressed and the whole stack is tested for air tightness; the stack used in the experiment is installed on the fuel cell test bench test system, hydrogen is provided to the anode and air is provided to the cathode at different relative humidity and temperature, and the air flow is humidified through an external humidifier. High-precision temperature and humidity transmitters and pressure sensors are installed on the anode and cathode inlet and outlet pipes. The performance of the fuel cell stack is evaluated at an operating temperature of 80°C, a pressure of 1atm, an air relative humidity of 10% to 100%, and a hydrogen relative humidity of 0% to 100%. The gas pipeline temperature between the humidifier and the battery and between the battery and the dew point meter is maintained at 90°C. Connect each signal output line 4 on the membrane electrode moisture content monitoring device of the fuel cell to the multi-channel acquisition impedance analysis system (which can be an impedance tester), and the connecting wire needs to ensure good contact and prevent interference. Turn on the test instrument and conduct the test. The sampling frequency is set to 5000Hz and the sampling time is set to 2min. At the same time, the test results are dynamically displayed in the visualization window.

[0090] According to the fuel cell membrane electrode moisture content monitoring device method proposed in the embodiment of the present application, by setting a plurality of sub-pads corresponding to the fuel cell membrane electrode to be tested on the PCB substrate, the current signal of the membrane electrode unit at different positions can be obtained in different regions, and after the current signal is converted into a voltage signal through the first resistor, the voltage signal is converted into an impedance spectrum by an impedance tester, so that the moisture content distribution information can be generated based on the impedance spectrum. The fuel cell membrane electrode moisture content monitoring device has a simple structure and occupies a small space. When testing the fuel cell moisture content, the device can be directly placed in the fuel cell, thereby ensuring the sealing of the fuel cell, and then realizing real-time monitoring of different regions of the membrane electrode unit, effectively improving the efficiency and accuracy of the membrane electrode unit moisture content monitoring. It makes it possible to determine the moisture content in the membrane electrode plane during the operation of the fuel cell PEMFC, including the constant current output and transient current load change period.

[0091] Figure 7 700 is a block diagram of a device for monitoring the water content of a membrane electrode of a fuel cell according to an exemplary embodiment. For example, the device 700 may be an electronic device, such as a mobile phone, a computer, a digital broadcast terminal, a messaging device, a game console, a tablet device, a medical device, a fitness device, a personal digital assistant, etc.

[0092] Reference Figure 7 , the device 700 may include one or more of the following components: a processing component 702 , a memory 704 , a power component 706 , a multimedia component 708 , an audio component 710 , an input / output (I / O) interface 712 , a sensor component 714 , and a communication component 716 .

[0093] The processing component 702 generally controls the overall operation of the device 700, such as operations associated with display, phone calls, data communications, camera operations, and recording operations. The processing component 702 may include one or more processors 720 to execute instructions to complete all or part of the steps of the above-mentioned method. In addition, the processing component 702 may include one or more modules to facilitate the interaction between the processing component 702 and other components. For example, the processing component 702 may include a multimedia module to facilitate the interaction between the multimedia component 708 and the processing component 702.

[0094] The memory 704 is configured to store various types of data to support operations on the device 700. Examples of such data include instructions for any application or method operating on the device 700, contact data, phone book data, messages, pictures, videos, etc. The memory 704 can be implemented by any type of volatile or non-volatile storage device or a combination thereof, such as static random access memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic memory, flash memory, magnetic disk or optical disk.

[0095] The power component 706 provides power to the various components of the device 700. The power component 706 may include a power management system, one or more power supplies, and other components associated with generating, managing, and distributing power for the device 700.

[0096] The multimedia component 708 includes a screen that provides an output interface between the device 700 and the user. In some embodiments, the screen may include a liquid crystal display (LCD) and a touch panel (TP). If the screen includes a touch panel, the screen may be implemented as a touch screen to receive input signals from the user. The touch panel includes one or more touch sensors to sense touch, slide, and gestures on the touch panel. The touch sensor may not only sense the boundaries of the touch or slide action, but also detect the duration and pressure associated with the touch or slide operation. In some embodiments, the multimedia component 708 includes a front camera and / or a rear camera. When the device 700 is in an operating mode, such as a shooting mode or a video mode, the front camera and / or the rear camera may receive external multimedia data. Each front camera and rear camera may be a fixed optical lens system or have a focal length and optical zoom capability.

[0097] The audio component 710 is configured to output and / or input audio signals. For example, the audio component 710 includes a microphone (MIC), and when the device 700 is in an operating mode, such as a call mode, a recording mode, and a speech recognition mode, the microphone is configured to receive an external audio signal. The received audio signal can be further stored in the memory 704 or sent via the communication component 716. In some embodiments, the audio component 710 also includes a speaker for outputting audio signals.

[0098] I / O interface 712 provides an interface between processing component 702 and peripheral interface modules, such as keyboards, click wheels, buttons, etc. These buttons may include but are not limited to: a home button, a volume button, a start button, and a lock button.

[0099] The sensor assembly 714 includes one or more sensors for providing various aspects of status assessment for the device 700. For example, the sensor assembly 714 can detect the open / closed state of the device 700, the relative positioning of components, such as the display and keypad of the device 700, and the sensor assembly 714 can also detect the position change of the device 700 or a component of the device 700, the presence or absence of user contact with the device 700, the orientation or acceleration / deceleration of the device 700, and the temperature change of the device 700. The sensor assembly 714 may include a proximity sensor configured to detect the presence of nearby objects without any physical contact. The sensor assembly 714 may also include an optical sensor, such as a CMOS or CCD image sensor, for use in imaging applications. In some embodiments, the sensor assembly 714 may also include an accelerometer, a gyroscope sensor, a magnetic sensor, a pressure sensor, or a temperature sensor.

[0100] The communication component 716 is configured to facilitate wired or wireless communication between the device 700 and other devices. The device 700 can access a wireless network based on a communication standard, such as WiFi, 2G or 3G, or a combination thereof. In an exemplary embodiment, the communication component 716 receives a broadcast signal or broadcast-related information from an external broadcast management system via a broadcast channel. In an exemplary embodiment, the communication component 716 also includes a near field communication (NFC) module to facilitate short-range communication. For example, the NFC module can be implemented based on radio frequency identification (RFID) technology, infrared data association (IrDA) technology, ultra-wideband (UWB) technology, Bluetooth (BT) technology and other technologies.

[0101] In an exemplary embodiment, the apparatus 700 may be implemented by one or more application specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), field programmable gate arrays (FPGAs), controllers, microcontrollers, microprocessors or other electronic components to perform the above methods.

[0102] In an exemplary embodiment, a non-transitory computer-readable storage medium including instructions is also provided, such as a memory 704 including instructions, and the instructions can be executed by the processor 720 of the device 700 to perform the above method. For example, the non-transitory 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.

[0103] In an exemplary embodiment, a computer program product is also provided, comprising a computer program, which implements the above method when executed by the processor 720 of the device 700.

[0104] Those skilled in the art will readily appreciate other embodiments of the present invention after considering the specification and practicing the invention disclosed herein. This application is intended to cover any variations, uses or adaptations of the present invention that follow the general principles of the present invention and include common knowledge or customary techniques in the art that are not disclosed in this disclosure. The specification and examples are to be considered exemplary only, and the true scope and spirit of the present invention are indicated by the following claims.

[0105] It should be understood that the present invention is not limited to the exact construction that has 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 invention is limited only by the appended claims.

Claims

1. A device for monitoring the water content of a membrane electrode of a fuel cell, characterized in that: It includes a PCB substrate, a detection pad and a first resistor, wherein the detection pad includes N sub-pads, and the first resistor has N number, wherein: The N sub-pads are fixed on the PCB substrate; the N sub-pads are used to obtain current signals of different regions in the membrane electrode unit of the fuel cell; N is an integer greater than 1; For each of the N sub-pads, a side of the sub-pad close to the PCB substrate is electrically connected to a first end of a first resistor through a through hole reserved on the PCB substrate; The second end of each first resistor is connected to an impedance tester through a line; the impedance tester is used to generate an impedance spectrum according to a voltage signal input by the first resistor, so as to generate water content distribution information based on the impedance spectrum.

2. The membrane electrode moisture content monitoring device for a fuel cell according to claim 1, characterized in that: Also included are N signal amplification elements, wherein: A signal amplifying element is connected to the line between each first resistor and the impedance tester; The input end of the signal amplifying element is connected to the second end of the first resistor, and the output end of the signal amplifying element is connected to the impedance tester.

3. The membrane electrode moisture content monitoring device for a fuel cell according to claim 1, characterized in that: The N sub-pads are all rectangular and have the same area. The N sub-pads are arranged in an array on the PCB substrate. The outer contour of the detection pad corresponds to the shape of the area to be detected of the membrane electrode unit.

4. The membrane electrode moisture content monitoring device for a fuel cell according to claim 1, characterized in that: The outer contour of the PCB substrate corresponds to the outer contour of the membrane electrode unit in the fuel cell.

5. The membrane electrode moisture content monitoring device for a fuel cell according to claim 1, characterized in that: The PCB substrate is provided with bolt mounting holes for fixing the membrane electrode unit.

6. The device for monitoring the water content of the membrane electrode of a fuel cell according to claim 2, characterized in that: The PCB substrate is provided with a plurality of capacitive spaces for installing the sub-pad, the first resistor and the signal amplifying element; each capacitive space is sequentially provided with a sub-pad, a first resistor and a signal amplifying element; the sub-pad, the first resistor and the signal amplifying element in the same capacitive space are sequentially connected through lines.

7. The device for monitoring the water content of the membrane electrode of a fuel cell according to claim 6, characterized in that: A lead-out metal sheet is also installed on one side of each volume space away from the sub-pad, and a plurality of signal output circuits are arranged on the PCB substrate. The input end of each signal output circuit is connected to a lead-out metal sheet, and the output end of each signal output circuit is connected to the impedance tester.

8. A method for monitoring the water content of a membrane electrode of a fuel cell, based on the device for monitoring the water content of a membrane electrode of a fuel cell according to any one of claims 1 to 7, characterized in that: include: Controlling the fuel cell to be tested to be in a running state; The impedance detector is controlled to receive voltage signals outputted by N first resistors of the membrane electrode moisture content monitoring device of the fuel cell; wherein the membrane electrode moisture content monitoring device of the fuel cell is arranged inside the shell of the fuel cell, and each of the first resistors is connected to the impedance tester through a line running through the shell; the voltage signal is obtained after the first resistor converts the current signal collected by the sub-pad; the impedance detector uses different signal transmission interfaces to receive the N voltage signals; Controlling the impedance detector to convert the collected N voltage signals into impedance spectra respectively; Obtaining identification information of the signal transmission interface corresponding to each of the N voltage signals; According to the preset mapping relationship between the identification information and the relative position coordinates, the regional position information corresponding to each impedance spectrum is determined, so as to determine the water content of different regions in the membrane electrode unit according to the impedance spectrum and the corresponding regional position information.

9. The method for monitoring the water content of the membrane electrode of a fuel cell according to claim 8, characterized in that: After determining the regional position information corresponding to each impedance spectrum according to the mapping relationship between the identification information and the relative position coordinates, the method may further include: Perform fast Fourier transform processing on each impedance spectrum to obtain a water content distribution map corresponding to each impedance spectrum; The water content distribution map is spliced ​​according to the regional position information corresponding to each impedance spectrum to obtain the water content distribution map of the membrane electrode unit.

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