CN112763926A

CN112763926A - Method and device for detecting impedance of single cell of fuel cell, and electronic apparatus

Info

Publication number: CN112763926A
Application number: CN202011543285.5A
Authority: CN
Inventors: 段羽
Original assignee: CRRC Suzhou Hydrogen Power Technology Co Ltd
Current assignee: CRRC Suzhou Hydrogen Power Technology Co Ltd
Priority date: 2020-12-21
Filing date: 2020-12-21
Publication date: 2021-05-07

Abstract

The application provides a method and a device for detecting the impedance of a single cell of a fuel cell and electronic equipment, relates to the technical field of cell detection, and solves the technical problem that the information comprehensiveness of a measurement result obtained by the existing method for measuring the impedance of the single cell is low. The method comprises the following steps: acquiring a control instruction sent by a fuel cell system controller (FCU), and controlling an inspection controller of the monocell to generate harmonic waves according to the control instruction; transmitting the harmonic wave into the single battery to obtain harmonic wave alternating current fed back by the single battery based on the harmonic wave; and calculating by a Fourier transform method based on the harmonic alternating current to obtain the impedance value of the single battery.

Description

Method and device for detecting impedance of single cell of fuel cell, and electronic apparatus

Technical Field

The present invention relates to the field of battery detection technologies, and in particular, to a method and an apparatus for detecting impedance of a single cell of a fuel cell, and an electronic device.

Background

Currently, the impedance of each single cell in a fuel cell can reflect the characteristics of the stack, so it is very necessary to measure the impedance of the single cell.

For the existing method for voltage inspection, the voltage of a single battery is observed in a limited way, and the definition of the fault is that the voltage of the single battery is low, so that the specific cause of the fault is difficult to define. Therefore, the information comprehensiveness of the measurement results obtained by the conventional method for measuring the impedance of the single cell is low, and it is difficult to thoroughly analyze the fault.

Disclosure of Invention

The invention aims to provide a method and a device for detecting the impedance of a single cell of a fuel cell and an electronic device, which solve the technical problem that the information comprehensiveness of the measurement result obtained by the conventional method for measuring the impedance of the single cell is low.

In a first aspect, an embodiment of the present application provides a method for detecting impedance of a single cell of a fuel cell, the method including:

acquiring a control instruction sent by a fuel cell system controller (FCU), and controlling an inspection controller of the single cell to generate harmonic waves according to the control instruction;

transmitting the harmonic wave into the single battery to obtain harmonic wave alternating current fed back by the single battery based on the harmonic wave;

and calculating by a Fourier transform method based on the harmonic alternating current to obtain the impedance value of the single battery.

In one possible implementation, after the step of obtaining the impedance value of the single cell by performing the calculation based on the harmonic alternating current by the fourier transform method, the method further includes:

analyzing based on the impedance value of the single cell to obtain the fault condition of the single cell and/or the dry and wet state of the proton exchange membrane of the single cell;

and reporting the dry and wet state and/or the fault condition to the FCU.

In one possible implementation, the inspection measurement sequence of the inspection controller is based on the maximum number of the electric piles to be measured in turn and circularly.

In one possible implementation, the polling measurement process of the polling controller is to perform polling measurement in sequence according to the input numbers of the single batteries through a digital switch.

In one possible implementation, the step of transmitting the harmonic into the battery cell to obtain a harmonic alternating current of the battery cell based on the harmonic feedback includes:

and sequentially switching the digital switches on and off according to the single-chip sequencing, and injecting the harmonic into the single battery through the sequentially switched digital switches to obtain the harmonic alternating current fed back by the single battery based on the harmonic.

In one possible implementation, the step of obtaining the impedance value of the single cell by performing the calculation based on the harmonic alternating current by the fourier transform method includes:

collecting harmonic voltage generated by the monocell and voltage generated by the monocell;

and performing signal processing based on the harmonic voltage generated by the single cell and the voltage generated by the single cell, and performing Fourier transform and data analysis according to the signal processing result to obtain the impedance amplitude of the single cell.

In one possible implementation, the single cell is any one of the fuel cells.

In a second aspect, there is provided an impedance detection apparatus of a single cell of a fuel cell, the apparatus including:

the acquisition module is used for acquiring a control instruction sent by a fuel cell system controller (FCU) and controlling an inspection controller of the monocell to generate harmonic waves according to the control instruction;

the transmission module is used for transmitting the harmonic into the single battery to obtain harmonic alternating current fed back by the single battery based on the harmonic;

and the calculation module is used for calculating through a Fourier transform method based on the harmonic alternating current to obtain the impedance value of the single battery.

In a third aspect, an embodiment of the present application further provides an electronic device, which includes a memory and a processor, where the memory stores a computer program that is executable on the processor, and the processor executes the computer program to implement the method of the first aspect or the second aspect.

In a fourth aspect, embodiments of the present application further provide a computer-readable storage medium storing computer-executable instructions, which, when invoked and executed by a processor, cause the processor to perform the method of the first or second aspect.

The embodiment of the application brings the following beneficial effects:

according to the single cell impedance detection method and device for the fuel cell and the electronic equipment, the control instruction sent by the fuel cell system controller FCU can be obtained, and the routing inspection controller of the single cell is controlled to generate harmonic waves according to the control instruction; transmitting the harmonic wave into the single battery to obtain harmonic wave alternating current of the single battery based on harmonic wave feedback; and calculating by a Fourier transform method based on the harmonic alternating current to obtain the impedance value of the single cell. In the scheme, the harmonic waves are generated by the inspection controller for controlling the monocells, the harmonic waves are transmitted into the monocells, harmonic alternating currents fed back by the monocells based on the harmonic waves are obtained, then calculation is carried out through a Fourier transform method based on the harmonic alternating currents, impedance values of the monocells are obtained, the impedance of the monocells of the fuel cell stack is detected through Fourier conversion relations of the measured harmonic alternating currents of the monocells, compared with the traditional monocell voltage inspection measurement, the method is more comprehensive, analysis of the monocells is more direct, more information of the monocells can be collected, failure analysis of the monocells is more thorough, and the service life of the cell stack is prolonged.

In order to make the aforementioned objects, features and advantages of the present application more comprehensible, preferred embodiments accompanied with figures are described in detail below.

Drawings

In order to more clearly illustrate the detailed description of the present application or the technical solutions in the prior art, the drawings needed to be used in the detailed description of the present application or the prior art description will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative efforts.

Fig. 1 is a schematic flow chart of a method for detecting the impedance of a single cell of a fuel cell according to an embodiment of the present disclosure;

fig. 2 is a schematic flow chart of a single-cell impedance inspection process in the method for detecting the impedance of a single cell of a fuel cell according to the embodiment of the present application;

fig. 3 is a schematic structural diagram of an impedance detection device for a single cell of a fuel cell according to an embodiment of the present disclosure;

fig. 4 shows a schematic structural diagram of an electronic device provided in an embodiment of the present application.

Detailed Description

To make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions of the present application will be clearly and completely described below with reference to the accompanying drawings, and it is obvious that the described embodiments are some, but not all embodiments of the present application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

The terms "comprising" and "having," and any variations thereof, as referred to in the embodiments of the present application, are intended to cover non-exclusive inclusions. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those steps or elements but may alternatively include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

At present, the information comprehensiveness of the measurement result obtained by the existing method for measuring the impedance of the single battery is low, and the fault is difficult to be thoroughly analyzed. Based on this, the embodiments of the present application provide a method and an apparatus for detecting the impedance of a single cell of a fuel cell, and an electronic device, by which the technical problem of low information comprehensiveness of the measurement result obtained by the conventional method for measuring the impedance of a single cell can be alleviated.

Embodiments of the present invention are further described below with reference to the accompanying drawings.

Fig. 1 is a schematic flow chart of a method for detecting the impedance of a single cell of a fuel cell according to an embodiment of the present disclosure. As shown in fig. 1, the method includes:

step S110 is to obtain a control command sent by the fuel cell system controller FCU, and control the routing inspection controller of the cell to generate a harmonic according to the control command.

For example, as shown in fig. 2, a command may be issued by the fuel cell system controller (FCU) to the cell routing inspection controller to turn on the function of harmonic generation.

And step S120, transmitting the harmonic into the single battery to obtain harmonic alternating current of the single battery based on harmonic feedback.

For example, as shown in fig. 2, after the voltage of the cell is obtained, the controller automatically generates a voltage harmonic with a certain frequency according to the voltage amplitude, and injects the voltage harmonic into the cell, so as to obtain a harmonic alternating current of the cell based on harmonic feedback.

In step S130, the impedance value of the single cell is obtained by calculation using a fourier transform method based on the harmonic ac current.

For example, as shown in fig. 2, the harmonic ac current fed back is subjected to Fast Fourier Transform (FFT) to obtain the magnitude of the cell impedance. It is also understood that the fuel cell stack cell impedance measurement is obtained by a conversion relationship between the measured cell voltage and the cell ac current generated between the controller and the cell.

The power generation platform of the fuel cell is a proton exchange membrane, and electrons are generated by the electrochemical reaction of hydrogen and oxygen through the action of a catalyst. The diagnostic indicators of dry and flooded membrane faults are the changes in high frequency resistance and low frequency impedance. This is because the membrane resistance can be described approximately by the high frequency resistance of the impedance spectrum, which in practice is the greater the higher the high frequency resistance, which indicates that the lower the proton conductivity of the membrane, the lower the water content of the membrane. In the impedance spectrum, the low frequency impedance can be described as the mass transfer resistance of the cell, and as known from the water transfer mechanism of the PEMFC proton exchange membrane fuel cell, the failure of flooding can be defined as the blockage of the gas diffusion layer and the flow channel by the water generated by the electrochemical reaction of hydrogen and oxygen, thereby resulting in the increase of the mass transfer resistance of the gas. The service life of the electric pile is greatly influenced, the protection measures are the most critical, the impedance detection and analysis of the monocells can report faults more effectively and timely, and measures are taken, so that the risk of damaging the electric pile is reduced.

The single Cell Impedance Measurement method (Cell Impedance Measurement) of the fuel Cell provided by the embodiment of the application can replace a current Measurement method (Cell Voltage Monitoring, CVM) of a Voltage polling instrument of the fuel Cell, and compared with a traditional CVM detection method, the method provided by the embodiment of the application is more comprehensive, can analyze problems more directly, can collect more information related to a proton exchange membrane, and can analyze faults more thoroughly, so that the service life of a Cell stack is prolonged.

The above steps are described in detail below.

In some embodiments, after step S130, the method may further include the steps of:

step a), analyzing based on the impedance value of the single cell to obtain the fault condition of the single cell and/or the dry and wet state of the proton exchange membrane of the single cell;

and b), reporting the dry and wet state and/or the fault condition to the FCU.

For example, as shown in fig. 2, the dry-wet state and/or the fault condition of the proton exchange membrane can be analyzed based on the magnitude of the impedance of the single cell, and reported to the fuel cell system controller FCU. Finally, the control signals are sent to a fuel cell controller to carry out necessary measures, so that the service life of the stack can be ensured to be unaffected.

In some embodiments, the patrol measurement sequence of the patrol controller is sequentially and cyclically measured based on the maximum number of pieces of the electric pile.

For example, as shown in fig. 2, the sequence of the inspection measurement of the inspection controller is the sequence from 1, 2, 3 … … to N, where N is the maximum number of the electric pile, and the impedance value is measured and calculated cyclically. Through the measurement of patrolling and examining according to the order in proper order of the maximum number of pieces of pile, can improve and patrol and examine measuring efficiency, avoid patrolling and examining the measuring process and take place the condition in disorder.

Based on the method, the inspection measurement process of the inspection controller is to sequentially perform inspection measurement according to the input numbers of the single cells through the digital switch.

In practical use, the digital switch performs inspection measurement according to the number of the inputted cell as shown in fig. 2. The digital switch is used for sequentially carrying out inspection measurement according to the number of the input single battery, and the digital switch can be used for ensuring the orderliness of the inspection process.

Based on this, the step S120 may include the steps of:

and c), sequentially switching on and off the digital switches according to the single-chip sequencing, and injecting the harmonic into the single battery through the sequentially switched digital switches to obtain harmonic alternating current of the single battery based on harmonic feedback.

For example, as shown in fig. 2, harmonics are injected into the cells in a single-chip row order from 0 to N to sequentially turn on and off the digital switches, and an alternating voltage is generated from the obtained cell voltage. The digital switches are sequentially switched on and off by sequencing the harmonics according to the single chips, so that the harmonics can be sequentially and sequentially injected into the single batteries.

In some embodiments, the step S130 may include the following steps:

step d), collecting harmonic voltage generated by the monocell and voltage generated by the monocell;

and e), performing signal processing based on the harmonic voltage generated by the single cell and the voltage generated by the single cell, and performing Fourier transform and data analysis according to the signal processing result to obtain the impedance amplitude of the single cell.

Illustratively, as shown in fig. 2, the acquisition feedback current may be sent to an acquisition board for signal processing. It should be noted that the total voltage of the single cell is the voltage generated by the generated harmonic voltage and the single cell, and after being collected, the impedance amplitude of the single cell is obtained more accurately and comprehensively through signal processing, fourier transform, estimation of the impedance value, analysis and judgment.

In some embodiments, the cell may be any cell in a fuel cell. The method provided by the embodiment of the application can also be used for flexibly detecting the impedance value of any single battery cell, so that the performance of the specified single battery cell can be more effectively evaluated and detected, and the flexibility and the effectiveness of detection are improved.

Fig. 3 provides a schematic configuration diagram of an impedance detection device of a single cell of a fuel cell. As shown in fig. 3, the resistance detection device 300 for a single cell of a fuel cell includes:

an obtaining module 301, configured to obtain a control instruction sent by a fuel cell system controller FCU, and control an inspection controller of the single cell to generate a harmonic according to the control instruction;

a transmission module 302, configured to transmit the harmonic into the cell, so as to obtain a harmonic alternating current fed back by the cell based on the harmonic;

a calculating module 303, configured to calculate by using a fourier transform method based on the harmonic alternating current to obtain an impedance value of the single cell.

In some embodiments, the apparatus further comprises:

the analysis module is used for analyzing based on the impedance value of the single cell to obtain the fault condition of the single cell and/or the dry and wet state of the proton exchange membrane of the single cell;

and the reporting module is used for reporting the dry and wet state and/or the fault condition to the FCU.

In some embodiments, the patrol measurement process of the patrol controller is to perform patrol measurements sequentially according to the number of the battery cells inputted through a digital switch.

In some embodiments, the transmission module 302 is specifically configured to:

In some embodiments, the calculation module 303 is specifically configured to:

In some embodiments, the single cell is any one of the fuel cells.

The device for detecting the impedance of the single cell of the fuel cell provided by the embodiment of the present application has the same technical features as the method for detecting the impedance of the single cell of the fuel cell provided by the above embodiment, so that the same technical problems can be solved, and the same technical effects can be achieved.

As shown in fig. 4, an electronic device 400 provided in an embodiment of the present application includes a processor 402 and a memory 401, where a computer program operable on the processor is stored in the memory, and when the processor executes the computer program, the steps of the method provided in the foregoing embodiment are implemented.

Referring to fig. 4, the electronic device further includes: a bus 403 and a communication interface 404, the processor 402, the communication interface 404 and the memory 401 being connected by the bus 403; the processor 402 is used to execute executable modules, such as computer programs, stored in the memory 401.

The Memory 401 may include a high-speed Random Access Memory (RAM), and may also include a non-volatile Memory (non-volatile Memory), such as at least one disk Memory. The communication connection between the network element of the system and at least one other network element is realized through at least one communication interface 404 (which may be wired or wireless), and the internet, a wide area network, a local network, a metropolitan area network, and the like can be used.

Bus 403 may be an ISA bus, PCI bus, EISA bus, or the like. The bus may be divided into an address bus, a data bus, a control bus, etc. For ease of illustration, only one double-headed arrow is shown in FIG. 4, but that does not indicate only one bus or one type of bus.

The memory 401 is used for storing a program, and the processor 402 executes the program after receiving an execution instruction, and the method performed by the apparatus defined by the process disclosed in any of the foregoing embodiments of the present application may be applied to the processor 402, or implemented by the processor 402.

The processor 402 may be an integrated circuit chip having signal processing capabilities. In implementation, the steps of the above method may be performed by integrated logic circuits of hardware or instructions in the form of software in the processor 402. The Processor 402 may be a general-purpose Processor, and includes a Central Processing Unit (CPU), a Network Processor (NP), and the like; the device can also be a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field-Programmable Gate Array (FPGA), or other Programmable logic devices, discrete Gate or transistor logic devices, discrete hardware components. The various methods, steps, and logic blocks disclosed in the embodiments of the present application may be implemented or performed. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like. The steps of the method disclosed in connection with the embodiments of the present application may be directly implemented by a hardware decoding processor, or implemented by a combination of hardware and software modules in the decoding processor. The software module may be located in ram, flash memory, rom, prom, or eprom, registers, etc. storage media as is well known in the art. The storage medium is located in the memory 401, and the processor 402 reads the information in the memory 401 and completes the steps of the method in combination with the hardware.

In correspondence with the method for detecting the impedance of the single cell of the fuel cell, the embodiment of the present application further provides a computer-readable storage medium storing computer-executable instructions, which, when invoked and executed by a processor, cause the processor to execute the steps of the method for detecting the impedance of the single cell of the fuel cell.

The impedance detection device for the single cell of the fuel cell provided by the embodiment of the present application may be specific hardware on the device, or software or firmware installed on the device, or the like. The device provided by the embodiment of the present application has the same implementation principle and technical effect as the foregoing method embodiments, and for the sake of brief description, reference may be made to the corresponding contents in the foregoing method embodiments where no part of the device embodiments is mentioned. It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the foregoing systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.

In the embodiments provided in the present application, it should be understood that the disclosed apparatus and method may be implemented in other ways. The above-described embodiments of the apparatus are merely illustrative, and for example, the division of the units is only one logical division, and there may be other divisions when actually implemented, and for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection of devices or units through some communication interfaces, and may be in an electrical, mechanical or other form.

For another example, the flowchart and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of apparatus, methods and computer program products according to various embodiments of the present application. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). It should also be noted that, in some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. It will also be noted that each block of the block diagrams and/or flowchart illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, can be implemented by special purpose hardware-based systems which perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.

The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.

In addition, functional units in the embodiments provided in the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit.

The functions, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present application or a part of the technical solution may be embodied in the form of a software product stored in a storage medium and including instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method for detecting the impedance of the single cell of the fuel cell according to the embodiments of the present application. And the aforementioned storage medium includes: various media capable of storing program codes, such as a usb disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus once an item is defined in one figure, it need not be further defined and explained in subsequent figures, and moreover, the terms "first", "second", "third", etc. are used merely to distinguish one description from another and are not to be construed as indicating or implying relative importance.

Finally, it should be noted that: the above-mentioned embodiments are only specific embodiments of the present application, and are used for illustrating the technical solutions of the present application, but not limiting the same, and the scope of the present application is not limited thereto, and although the present application is described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: any person skilled in the art can modify or easily conceive the technical solutions described in the foregoing embodiments or equivalent substitutes for some technical features within the technical scope disclosed in the present application; such modifications, changes or substitutions do not depart from the scope of the embodiments of the present application. Are intended to be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A method of detecting an impedance of a single cell of a fuel cell, characterized by comprising:

acquiring a control instruction sent by a fuel cell system controller (FCU), and controlling an inspection controller of the monocell to generate harmonic waves according to the control instruction;

2. The method of detecting the impedance of a single cell of a fuel cell according to claim 1, further comprising, after the step of obtaining the impedance value of the single cell by performing the calculation by a fourier transform method based on the harmonic alternating current, the step of:

and reporting the dry and wet state and/or the fault condition to the FCU.

3. The method for detecting the impedance of the unit cell of the fuel cell according to claim 1, wherein the inspection measurement order of the inspection controller is sequentially measured cyclically based on the maximum number of pieces of the stack.

4. The method for detecting the impedance of the unit cell of the fuel cell according to claim 3, wherein the patrol measurement process of the patrol controller is to sequentially perform patrol measurement according to the number of the unit cell inputted through a digital switch.

5. The method according to claim 4, wherein the step of transmitting the harmonic into the cell to obtain a harmonic alternating current fed back by the cell based on the harmonic comprises:

6. The method of detecting the impedance of a single cell of a fuel cell according to claim 1, wherein the step of obtaining the impedance value of the single cell by performing the calculation by a fourier transform method based on the harmonic alternating current includes:

7. The method of detecting the impedance of a single cell of a fuel cell according to claim 1, wherein the single cell is any one of the fuel cells.

8. An impedance detection device of a single cell of a fuel cell, characterized by comprising:

9. An electronic device comprising a memory and a processor, wherein the memory stores a computer program operable on the processor, and wherein the processor implements the steps of the method of any of claims 1 to 7 when executing the computer program.

10. A computer readable storage medium having stored thereon computer executable instructions which, when invoked and executed by a processor, cause the processor to execute the method of any of claims 1 to 7.