CN116224130A - Electric power system storage battery pack inspection method and device based on electrochemical impedance spectrum - Google Patents
Electric power system storage battery pack inspection method and device based on electrochemical impedance spectrum Download PDFInfo
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- CN116224130A CN116224130A CN202310167013.7A CN202310167013A CN116224130A CN 116224130 A CN116224130 A CN 116224130A CN 202310167013 A CN202310167013 A CN 202310167013A CN 116224130 A CN116224130 A CN 116224130A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/396—Acquisition or processing of data for testing or for monitoring individual cells or groups of cells within a battery
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/389—Measuring internal impedance, internal conductance or related variables
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention discloses a method and a device for inspecting a storage battery pack of an electric power system based on electrochemical impedance spectrum, which belong to the field of detection of the storage battery pack for the electric power system and comprise the following steps: the method comprises the steps of obtaining a reference electrochemical impedance spectrum of a tested storage battery pack in advance, selecting the same working condition, and periodically measuring the electrochemical impedance spectrum of the tested storage battery pack to obtain a test electrochemical impedance spectrum; and finally, calculating the deviation degree of the test electrochemical impedance spectrum and the reference electrochemical impedance spectrum, and judging the health condition of the tested storage battery. The invention can effectively save the operation and maintenance cost of the storage battery pack of the power system, improve the detection efficiency and accuracy, grasp the internal degradation condition of the storage battery pack in time and ensure the safe and stable operation of the power system of the transformer substation.
Description
Technical Field
The invention relates to the field of detection of storage battery packs for power systems, in particular to a method and a device for inspecting the storage battery packs of the power systems based on electrochemical impedance spectrums.
Background
The storage battery pack is used as an important backup power supply in a power system, and usually a plurality of single storage batteries are connected in series to form a 220V or 48V direct current power supply system. When the substation is powered off by the total station alternating current power supply, reliable electric energy supply can be provided for electric equipment, and the electric equipment is a final barrier without interruption of the station power supply. In recent years, a plurality of accidents of total station power failure caused by the failure of the storage battery pack occur, and the online monitoring technology of the health condition of the storage battery pack is paid attention to gradually.
The current on-line monitoring means generally collect the terminal voltage, the temperature of the pole, the internal resistance and other data of the single storage battery in real time to analyze and judge. However, as the number of the sensors is numerous, the monitoring system is complex, the input cost is high, the installation and maintenance are time-consuming and labor-consuming, the influence of the voltage, the temperature, the internal resistance and other data of the single battery on the whole health condition of the storage battery pack is still to be further researched, and the monitoring personnel are often required to automatically analyze and judge by combining the working experience, so that the judgment result has high dispersibility. The electrochemical impedance spectrum measurement of the battery is an important means for obtaining the health state of the battery, but the current device can only complete the electrochemical impedance spectrum measurement of a single battery (or a few batteries connected in series) due to the limited applied voltage, and can not realize the electrochemical impedance spectrum detection of the battery pack in the running process.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, and provides a method and a device for inspecting a storage battery pack of an electric power system based on electrochemical impedance spectroscopy, which can effectively save the operation and maintenance cost of the storage battery pack of the electric power system, improve the detection efficiency and accuracy, timely master the internal degradation condition of the storage battery pack and ensure the safe and stable operation of a power supply system of a transformer substation.
The invention aims at realizing the following scheme:
an electric power system storage battery pack inspection method based on electrochemical impedance spectroscopy comprises the following steps:
the method comprises the steps of obtaining a reference electrochemical impedance spectrum of a tested storage battery pack in advance, selecting the same working condition, and periodically measuring the electrochemical impedance spectrum of the tested storage battery pack to obtain a test electrochemical impedance spectrum;
and finally, calculating the deviation degree of the test electrochemical impedance spectrum and the reference electrochemical impedance spectrum, and judging the health condition of the tested storage battery.
Further, the reference electrochemical impedance spectrum of the tested storage battery is obtained under the condition that the floating charge time is long enough, and the voltage and current ends of the storage battery electrochemical impedance spectrum detection device are respectively and electrically connected with the anode and the cathode of the tested storage battery; then select amplitude value to be 0.05I 10 ～0.25I 10 Sinusoidal excitation current signal of (f), test frequency f 1 ～f 2 The method is applied to a tested storage battery, positive and negative alternating voltage signals of the storage battery are collected, the impedance of the storage battery under excitation signals with different frequencies is calculated, and an electrochemical impedance detection map is formed.
Further, the step of selecting the same working condition, and periodically performing electrochemical impedance spectrum measurement on the tested storage battery pack comprises the following substeps:
according to the operation and maintenance regulations of the power system by using the direct current power supply device, comparing the test temperature before each test, and controlling the temperature difference within a set range;
and inquiring historical charge and discharge data of the tested storage battery monitoring device, ensuring that the working condition of the tested storage battery is consistent with the initial working condition, and avoiding an equalizing charge stage of routine maintenance.
Further, the calculating the deviation degree of the test electrochemical impedance spectrum from the reference electrochemical impedance spectrum includes the following substeps:
firstly, calculating an impedance difference delta Zi of the test electrochemical impedance spectrum and the reference electrochemical impedance spectrum at the same frequency point;
drawing a curve delta Z (f) of the impedance difference value along with the change of frequency;
re-calculating the impedance difference function DeltaZ (f) at f 1 ～f 2 Integrating in the frequency band to obtain the deviation degree
And finally, judging the electrochemical characteristics in the tested storage battery based on the deviation degree obtained by the detection of the electrochemical impedance spectrum calculation, thereby completing the judgment of the health condition of the tested storage battery.
Further, the calculating the deviation degree of the test electrochemical impedance spectrum from the reference electrochemical impedance spectrum includes the following substeps: the degree of curve deviation of the test pattern from the reference pattern is determined using the shape-based distance or using the segment-based distance.
An electric power system storage battery pack inspection device based on electrochemical impedance spectroscopy, which is used for executing the method according to any one of the above, and further comprises an alternating current excitation source, an alternating voltage acquisition module, a clock synchronization module, a central processing unit and a man-machine interaction module;
the alternating current excitation source is connected with the anode and the cathode of the tested storage battery pack and is used for applying sine wave currents with different frequencies;
the alternating voltage acquisition module is connected with the anode and the cathode of the tested storage battery and is used for acquiring voltage signals of the end of the tested storage battery;
the clock synchronization module is connected with the alternating current excitation source and the alternating voltage acquisition module and is used for ensuring the synchronism of alternating current signals and alternating voltage signals;
the central processing unit performs data interaction with the alternating current excitation source and the alternating voltage acquisition module, is used for outputting an operation instruction of the man-machine interaction module, receiving a real-time feedback signal, storing voltage and current data subjected to signal conditioning, and calculating electrochemical impedance and curve deviation degree of the tested storage battery pack at each test frequency point;
the man-machine interaction module is connected with the central processing unit and used for receiving and translating operation instructions of operators and outputting related information to the operators.
Further, the test device also comprises a special test lead wire which is used for connecting the tested storage battery pack with an alternating current excitation source and an alternating voltage collector.
Further, the maximum voltage range of the alternating voltage acquisition module is not lower than 220V, and the alternating voltage acquisition module has an anti-interference function, is used for inhibiting internal and external interference in the testing process, and ensures the accuracy of acquired alternating voltage signals.
Furthermore, the central processing unit also has self-checking and protecting functions, and is used for checking whether the test wiring is correct, and carrying out early warning on abnormal conditions in the detection process and sending out a protecting instruction to stop detection.
Further, the man-machine interaction module further comprises a display, control software and data processing software.
The beneficial effects of the invention include:
the invention solves the problem that the grouped measurement cannot be carried out by optimizing and improving the existing electrochemical impedance spectrum scheme. The characteristic that the electrochemical impedance spectrum curve can sensitively represent the health condition of the tested storage battery is utilized, the acquired test spectrum is compared with the reference spectrum, and the deviation degree of the test spectrum curve is calculated, so that the evaluation and judgment of the health condition of the tested storage battery are completed. The device can be used for carrying out periodic inspection work of a plurality of groups of storage batteries simultaneously, is simple to operate and visual in process, and is convenient for workers to quickly master and apply. Meanwhile, the invention can effectively save the operation and maintenance cost of the storage battery pack of the power system, improve the detection efficiency and accuracy, grasp the internal degradation condition of the storage battery pack in time and ensure the safe and stable operation of the power supply system of the transformer substation.
The invention solves the defects of high cost, time and labor waste in installation and maintenance, large dispersibility of judgment results and the like of the existing storage battery online monitoring system, and the technical problem that the existing electrochemical impedance spectroscopy instrument cannot measure in groups.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions of the prior art, the drawings which are used in the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the description below are only some embodiments of the invention, and that other drawings can be obtained according to these drawings without inventive faculty for a person skilled in the art.
FIG. 1 is a flow chart of a method for testing electrochemical impedance spectra of a battery pack according to one embodiment of the invention; the method comprises the steps of carrying out a first treatment on the surface of the
FIG. 2 is a block diagram of a battery electrochemical impedance spectroscopy test apparatus according to one embodiment of the present invention;
FIG. 3 is a flowchart illustrating the operation of a battery electrochemical impedance spectroscopy test apparatus according to one embodiment of the present invention;
FIG. 4 is a comparison of a reference profile and a test profile according to one embodiment of the present invention;
fig. 5 is a graph of impedance difference in accordance with one embodiment of the present invention.
Detailed Description
All of the features disclosed in all of the embodiments of this specification, or all of the steps in any method or process disclosed implicitly, except for the mutually exclusive features and/or steps, may be combined and/or expanded and substituted in any way.
Example 1
S1, selecting a group of newly put-into-operation storage battery packs, and under the condition that the floating charge time is long enough, carrying out electrochemical impedance spectrum measurement on the storage battery packs to serve as a reference map of the storage battery packs;
as shown in fig. 2, the voltage and current ends of the electrochemical impedance spectrum detection device of the storage battery are respectively and electrically connected with the anode and the cathode of the storage battery to be tested; selecting amplitude of 0.05I 10 ～0.25I 10 Sinusoidal excitation current signal of (f), test frequency f 1 ～f 2 The method is applied to a tested storage battery, positive and negative alternating voltage signals of the storage battery are collected, the impedance of the storage battery under excitation signals with different frequencies is calculated, and an electrochemical impedance detection map is formed.
S2, in the subsequent operation process of the tested storage battery pack, the same working condition is selected, and electrochemical impedance spectrum measurement is periodically carried out on the tested storage battery pack to be used as a test map;
according to the operation and maintenance regulations of the power system by using the direct current power supply device, the temperature in the direct current power supply screen is kept constant, and the test temperature is compared before each test, so that the difference is not excessive; and inquiring historical charge and discharge data of the tested storage battery monitoring device, and detecting after at least 48 hours of float charging to ensure that the working condition of the tested storage battery is consistent with the initial working condition and avoid a balanced charging stage of routine maintenance.
And S3, calculating the deviation degree of the test pattern and the reference pattern, and judging the health condition of the tested storage battery.
Fig. 4 depicts a reference profile versus test profile curve. Since the frequency point of each test is fixed, the impedance difference delta Zi of the test spectrum and the reference spectrum at the same frequency point can be calculated, and a curve delta Z (f) of the impedance difference with the change of frequency can be drawn. FIG. 5 is a graph plotting the impedance difference by calculating the impedance difference function ΔZ (f) at f 1 ～f 2 Integrating in the frequency band to obtain the deviation degree
The electrochemical impedance spectrum detection can sensitively reflect the complex electrochemical characteristics in the tested storage battery, if the health condition of the tested storage battery is good, the deviation S should be close to 0, and if the deterioration condition occurs, the deviation S should be obviously changed compared with the earlier-stage test data, so that the judgment of the health condition of the tested storage battery is completed.
Example 2
Alternatively, the method of determining the degree of curve deviation of the test pattern from the reference pattern may also be used, without being limited to this embodiment, by using a shape-based distance, a segment-based distance, or the like.
The embodiment provides a storage battery pack detection device based on electrochemical impedance spectroscopy on the basis of embodiment 1, as shown in fig. 2-3, including an alternating current excitation source, an alternating voltage acquisition module, a clock synchronization module, a central processing unit and a man-machine interaction module, wherein:
the alternating current excitation source is connected with the anode and the cathode of the tested storage battery pack and is used for applying small-amplitude sine wave currents with different frequencies;
the alternating voltage collector is connected with the anode and the cathode of the tested storage battery and is used for collecting voltage signals of the end of the tested storage battery.
The clock synchronization module is connected with the alternating current excitation source and the alternating voltage collector and is used for ensuring good synchronism of alternating current signals and alternating voltage signals.
The central processing unit performs data interaction with the alternating current excitation source and the alternating voltage collector, is used for outputting an operation instruction of the man-machine interaction module, receiving a real-time feedback signal, storing voltage and current data subjected to signal conditioning, and calculating electrochemical impedance and curve deviation degree of the tested storage battery pack at each test frequency point.
The man-machine interaction module is connected with the central processing unit and used for receiving and translating operation instructions of operators and outputting related information to the operators.
The storage battery detection device of the electrochemical impedance spectrum also comprises a special test lead wire which is used for connecting the tested storage battery with an alternating current excitation source and an alternating voltage collector.
The maximum voltage range of the alternating voltage collector is not lower than 220V, and the alternating voltage collector has an anti-interference function, is used for inhibiting internal and external interference in the testing process, and ensures the accuracy of the collected alternating voltage signals.
The central processing unit also has self-checking and protecting functions, and is used for checking whether the test wiring is correct, and carrying out early warning on abnormal conditions in the detection process and sending out a protecting instruction to stop detection.
The man-machine interaction module also comprises a display, control software and data processing software.
As shown in fig. 3, the working procedure of the electrochemical impedance spectrum testing device of the storage battery pack is as follows:
correctly connecting the device with the tested storage battery, and setting the test current amplitude to be 0.05I 10 ～0.25I 10 Setting a test frequency f 1 ～f 2 Begin to test spectrumAnd acquiring graph data, calculating an impedance difference delta Zi of the test graph and the reference graph at the same frequency point, drawing a curve delta Z (f) of the impedance difference along with the change of the frequency, calculating a deviation S, and judging the health condition of the tested storage battery pack according to the deviation.
It should be noted that, within the scope of protection defined in the claims of the present invention, the following embodiments may be combined and/or expanded, and replaced in any manner that is logical from the above specific embodiments, such as the disclosed technical principles, the disclosed technical features or the implicitly disclosed technical features, etc.
The units involved in the embodiments of the present invention may be implemented by software, or may be implemented by hardware, and the described units may also be provided in a processor. Wherein the names of the units do not constitute a limitation of the units themselves in some cases.
According to an aspect of embodiments of the present invention, there is provided a computer program product or computer program comprising computer instructions stored in a computer readable storage medium. The computer instructions are read from the computer-readable storage medium by a processor of a computer device, and executed by the processor, cause the computer device to perform the methods provided in the various alternative implementations described above.
As another aspect, the embodiment of the present invention also provides a computer-readable medium that may be contained in the electronic device described in the above embodiment; or may exist alone without being incorporated into the electronic device. The computer-readable medium carries one or more programs which, when executed by the electronic device, cause the electronic device to implement the methods described in the above embodiments.
The invention is not related in part to the same as or can be practiced with the prior art.
The foregoing technical solution is only one embodiment of the present invention, and various modifications and variations can be easily made by those skilled in the art based on the application methods and principles disclosed in the present invention, not limited to the methods described in the foregoing specific embodiments of the present invention, so that the foregoing description is only preferred and not in a limiting sense.
In addition to the foregoing examples, those skilled in the art will recognize from the foregoing disclosure that other embodiments can be made and in which various features of the embodiments can be interchanged or substituted, and that such modifications and changes can be made without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (10)
1. The method for inspecting the storage battery pack of the electric power system based on the electrochemical impedance spectrum is characterized by comprising the following steps of:
the method comprises the steps of obtaining a reference electrochemical impedance spectrum of a tested storage battery pack in advance, selecting the same working condition, and periodically measuring the electrochemical impedance spectrum of the tested storage battery pack to obtain a test electrochemical impedance spectrum;
and finally, calculating the deviation degree of the test electrochemical impedance spectrum and the reference electrochemical impedance spectrum, and judging the health condition of the tested storage battery.
2. The method for inspecting a battery pack of an electric power system based on electrochemical impedance spectroscopy according to claim 1, wherein the obtaining of the reference electrochemical impedance spectroscopy of the battery pack to be inspected is performed under the condition that the floating charge time is long enough, and voltage and current ends of the battery pack electrochemical impedance spectroscopy detection device are electrically connected with the anode and the cathode of the battery pack to be inspected respectively; then select amplitude value to be 0.05I 10 ～0.25I 10 Sinusoidal excitation current signal of (f), test frequency f 1 ～f 2 The method is applied to a tested storage battery, positive and negative alternating voltage signals of the storage battery are collected, the impedance of the storage battery under excitation signals with different frequencies is calculated, and an electrochemical impedance detection map is formed.
3. The method for inspecting a battery pack of an electric power system based on electrochemical impedance spectroscopy according to claim 1, wherein the selecting the same working condition periodically performs electrochemical impedance spectroscopy measurement on the battery pack to be inspected, and the method comprises the following sub-steps:
according to the operation and maintenance regulations of the power system by using the direct current power supply device, comparing the test temperature before each test, and controlling the temperature difference within a set range;
and inquiring historical charge and discharge data of the tested storage battery monitoring device, ensuring that the working condition of the tested storage battery is consistent with the initial working condition, and avoiding an equalizing charge stage of routine maintenance.
4. The method for inspecting a battery pack of an electric power system based on electrochemical impedance spectroscopy according to claim 1, wherein the calculating the deviation of the test electrochemical impedance spectroscopy from the reference electrochemical impedance spectroscopy comprises the sub-steps of:
firstly, calculating an impedance difference delta Zi of the test electrochemical impedance spectrum and the reference electrochemical impedance spectrum at the same frequency point;
drawing a curve delta Z (f) of the impedance difference value along with the change of frequency;
re-calculating the impedance difference function DeltaZ (f) at f 1 ～f 2 Integrating in the frequency band to obtain the deviation degree
And finally, judging the electrochemical characteristics in the tested storage battery based on the deviation degree obtained by the detection of the electrochemical impedance spectrum calculation, thereby completing the judgment of the health condition of the tested storage battery.
5. The method for inspecting a battery pack of an electric power system based on electrochemical impedance spectroscopy according to claim 1, wherein the calculating the deviation of the test electrochemical impedance spectroscopy from the reference electrochemical impedance spectroscopy comprises the sub-steps of: the degree of curve deviation of the test pattern from the reference pattern is determined using the shape-based distance or using the segment-based distance.
6. An electric power system storage battery pack inspection device based on electrochemical impedance spectroscopy is characterized in that the device is used for executing the method of any one of claims 1-5, and further comprises an alternating current excitation source, an alternating voltage acquisition module, a clock synchronization module, a central processing unit and a man-machine interaction module;
the alternating current excitation source is connected with the anode and the cathode of the tested storage battery pack and is used for applying sine wave currents with different frequencies;
the alternating voltage acquisition module is connected with the anode and the cathode of the tested storage battery and is used for acquiring voltage signals of the end of the tested storage battery;
the clock synchronization module is connected with the alternating current excitation source and the alternating voltage acquisition module and is used for ensuring the synchronism of alternating current signals and alternating voltage signals;
the central processing unit performs data interaction with the alternating current excitation source and the alternating voltage acquisition module, is used for outputting an operation instruction of the man-machine interaction module, receiving a real-time feedback signal, storing voltage and current data subjected to signal conditioning, and calculating electrochemical impedance and curve deviation degree of the tested storage battery pack at each test frequency point;
the man-machine interaction module is connected with the central processing unit and used for receiving and translating operation instructions of operators and outputting related information to the operators.
7. The electrochemical impedance spectroscopy-based power system battery pack inspection device according to claim 6, further comprising a special test lead for connecting the tested battery pack with an alternating current excitation source and an alternating voltage collector.
8. The electric power system storage battery pack inspection device based on electrochemical impedance spectroscopy according to claim 6, wherein the maximum voltage range of the alternating voltage acquisition module is not lower than 220V, and the device has an anti-interference function, is used for inhibiting internal and external interference in the test process, and ensures the accuracy of the acquired alternating voltage signals.
9. The electrochemical impedance spectrum-based power system storage battery pack inspection device according to claim 6, wherein the central processing unit is further provided with self-inspection and protection functions, and is used for checking whether the test wiring is correct, early warning abnormal conditions in the detection process and sending out protection instructions to stop detection.
10. The electrochemical impedance spectroscopy-based power system battery pack inspection device of claim 6, wherein the human-machine interaction module further comprises a display, control software, and data processing software.
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| CN202310167013.7A CN116224130A (en) | 2023-02-24 | 2023-02-24 | Electric power system storage battery pack inspection method and device based on electrochemical impedance spectrum |
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| CN202310167013.7A CN116224130A (en) | 2023-02-24 | 2023-02-24 | Electric power system storage battery pack inspection method and device based on electrochemical impedance spectrum |
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