CN111474488A - Method and system for detecting micro internal short circuit of lithium ion battery - Google Patents
Method and system for detecting micro internal short circuit of lithium ion battery Download PDFInfo
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- CN111474488A CN111474488A CN202010189969.3A CN202010189969A CN111474488A CN 111474488 A CN111474488 A CN 111474488A CN 202010189969 A CN202010189969 A CN 202010189969A CN 111474488 A CN111474488 A CN 111474488A
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- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims abstract description 73
- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 73
- 238000000034 method Methods 0.000 title claims abstract description 23
- 238000012360 testing method Methods 0.000 claims abstract description 45
- 238000007599 discharging Methods 0.000 claims abstract description 15
- 238000010277 constant-current charging Methods 0.000 claims abstract description 13
- 238000001514 detection method Methods 0.000 claims description 6
- 238000010586 diagram Methods 0.000 description 10
- 238000004590 computer program Methods 0.000 description 7
- 238000012986 modification Methods 0.000 description 5
- 230000004048 modification Effects 0.000 description 5
- 230000006870 function Effects 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 238000012545 processing Methods 0.000 description 4
- 238000011156 evaluation Methods 0.000 description 3
- 238000001453 impedance spectrum Methods 0.000 description 3
- 238000007600 charging Methods 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000003446 memory effect Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 238000007781 pre-processing Methods 0.000 description 1
- 230000004044 response Effects 0.000 description 1
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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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Abstract
The invention discloses a method and a system for detecting micro-internal short circuit of a lithium ion battery, and belongs to the technical field of lithium ion batteries. The method comprises the following steps: carrying out circulating constant current charging and discharging on the lithium ion battery without micro internal circuit breaking; carrying out dynamic impedance test on the lithium ion battery to obtain test dynamic impedance data; testing the dynamic impedance of the lithium ion battery with the micro-internal open circuit to obtain dynamic impedance data; determining the slope standard of a lithium ion battery micro-inner short circuit straight line in a preset test frequency interval; and when the slope is smaller than or equal to the slope standard, determining that the lithium ion battery to be tested is subjected to micro-internal circuit breaking. The invention has higher accuracy, wider application range, higher efficiency and simplicity, and can be popularized to lithium ion batteries of various systems.
Description
Technical Field
The present invention relates to the technical field of lithium ion batteries, and more particularly, to a method and system for detecting occurrence of micro-internal short circuit in a lithium ion battery.
Background
Since commercialization in 1991, through continuous innovation and development, lithium ion batteries have the advantages of high working voltage, high quality energy density and volume energy density, no memory effect, low self-discharge rate, wide working temperature range and the like, and are widely applied to the fields of 3C digital, aerospace, smart grid, new energy automobiles and the like.
The service life of the lithium ion battery is influenced by various factors, such as temperature, charge and discharge multiplying power and the like, the phenomena of internal resistance increase, voltage reduction and the like can occur in the long-term use process, and the dangerous condition of internal short circuit can also occur, the temperature can be rapidly increased after the internal short circuit of the battery, thermal runaway and even explosion can easily occur, great property loss and potential safety hazards are caused, however, the micro internal short circuit of the battery is shown as small-amplitude voltage reduction, and the battery is difficult to discriminate. Patent CN201810889484.8 discloses a method for determining short circuit of a lithium ion battery by mechanical properties, in which a mechanical loading experiment is performed on the lithium ion battery to obtain an inflection point of a mechanical response curve, which corresponds to a voltage drop curve.
Disclosure of Invention
The invention provides a method for detecting micro-internal short circuit of a lithium ion battery, aiming at the problems, comprising the following steps:
placing the lithium ion battery without the micro-internal circuit break in an environment with a preset temperature, standing for a preset time, and performing circulating constant-current charging and discharging on the lithium ion battery with the micro-internal circuit break after standing;
after each cycle of constant current charging and discharging for a preset number of times, carrying out dynamic impedance test on the lithium ion battery to obtain test dynamic impedance data;
when the lithium ion battery is subjected to micro-internal short circuit, testing the dynamic impedance of the lithium ion battery with micro-internal open circuit to obtain dynamic impedance data;
determining log (/ Z /) and log (frequency) graphs of the dynamic impedance according to the dynamic impedance data and the test dynamic impedance data, and determining a slope standard of a short-circuit straight line in a lithium ion battery micro in a preset test frequency interval according to the log (/ Z /) and log (frequency) graphs;
and when the slope is smaller than or equal to the slope standard, determining that the lithium ion battery to be tested is subjected to micro-internal circuit breaking.
Optionally, the preset temperature range is-20 to 40 ℃.
Optionally, the preset time is 0.5-2 h.
Optionally, the preset number of times ranges from 80 to 120 times.
Optionally, the preset test evaluation interval is 0.01-10 Hz.
The invention also provides a system for detecting micro-internal short circuit of a lithium ion battery, which comprises the following components:
the pretreatment module is used for placing the lithium ion battery without the micro internal circuit break in an environment with a preset temperature, standing for a preset time, and performing circulating constant-current charging and discharging on the lithium ion battery with the micro internal circuit break after standing;
the first acquisition module is used for carrying out dynamic impedance test on the lithium ion battery after each cycle of constant-current charging and discharging for a preset number of times to obtain test dynamic impedance data;
the second acquisition module is used for determining the dynamic impedance of the lithium ion battery which is subjected to the micro-internal short circuit after the lithium ion battery is subjected to the test, and acquiring dynamic impedance data;
the determination standard module is used for determining log (/ Z /) and log (frequency) graphs of the dynamic impedance according to the dynamic impedance data and the test dynamic impedance data, and determining the slope standard of the short-circuit straight line in the lithium ion battery micro in the preset test frequency interval according to the log (/ Z /) and log (frequency) graphs;
and the test module is used for acquiring the dynamic impedance of the lithium ion battery to be tested as detection data, determining the slope of the detection data, and determining that the lithium ion battery to be tested is subjected to micro-internal disconnection when the slope is smaller than or equal to the slope standard.
Optionally, the preset temperature range is-20 to 40 ℃.
Optionally, the preset time is 0.5-2 h.
Optionally, the preset number of times ranges from 80 to 120 times.
Optionally, the preset test evaluation interval is 0.01-10 Hz.
The invention judges whether the battery has micro internal short circuit or not by testing the dynamic impedance of the battery in the charging and discharging process and taking the data as the basis, has higher accuracy, wider application range, higher efficiency and more simplicity, and can be popularized to lithium ion batteries of various systems.
Drawings
FIG. 1 is a flow chart of a method for detecting occurrence of micro-internal short circuit in a lithium ion battery according to the present invention;
FIG. 2 is a Nyquist plot of the dynamic impedance spectrum of a method for detecting the occurrence of a lithium ion battery micro-internal short circuit in accordance with the present invention;
FIG. 3 is a graph of a dynamic impedance spectrum log (/ Z /) vs log (frequency) of a method for detecting occurrence of micro-internal short circuit of a lithium ion battery according to the present invention;
fig. 4 is a structural diagram of a system for detecting occurrence of micro-internal short circuit of a lithium ion battery according to the present invention.
Detailed Description
The exemplary embodiments of the present invention will now be described with reference to the accompanying drawings, however, the present invention may be embodied in many different forms and is not limited to the embodiments described herein, which are provided for complete and complete disclosure of the present invention and to fully convey the scope of the present invention to those skilled in the art. The terminology used in the exemplary embodiments illustrated in the accompanying drawings is not intended to be limiting of the invention. In the drawings, the same units/elements are denoted by the same reference numerals.
Unless otherwise defined, terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Further, it will be understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense.
The invention provides a method for detecting micro-internal short circuit of a lithium ion battery, as shown in figure 1, comprising the following steps:
placing the lithium ion battery without micro internal circuit break in an environment with the temperature of-20-40 ℃, standing for 0.5-2 h, taking the lithium ion battery for 0.5h, and performing circulating constant current charging and discharging on the lithium ion battery with micro internal circuit break after standing;
after each cycle of constant current charging and discharging for 80-120 times, the dynamic impedance test is carried out on the lithium ion battery for 100 times in the invention, and the test dynamic impedance data is obtained;
testing the dynamic impedance of the lithium ion battery with the micro-internal open circuit to obtain dynamic impedance data, wherein a Nyquist diagram of a dynamic impedance spectrum is shown in FIG. 2;
determining a log (/ Z /) graph and a log (frequency) graph of the dynamic impedance according to the dynamic impedance data and the test dynamic impedance data as shown in FIG. 3, wherein,/Z/is a module length of the dynamic impedance, frequency is a frequency of the dynamic impedance, and a slope standard of a lithium ion battery micro-inner short circuit straight line in an interval of 0.01-10Hz is determined according to the log (/ Z /) graph and the log (frequency) graph, and the slope standard determined in the invention is-0.824;
and obtaining the dynamic impedance of the lithium ion battery to be detected as detection data, determining the slope of the detection data, and determining that the lithium ion battery to be detected is subjected to micro-internal circuit breaking when the slope is less than or equal to-0.824.
The present invention also provides a system 200 for detecting occurrence of micro-internal short circuit of a lithium ion battery, comprising:
the preprocessing module 201 is configured to place the lithium ion battery without the micro internal circuit break in an environment with a preset temperature, to stand for a preset time, and to perform cyclic constant current charging and discharging on the lithium ion battery with the micro internal circuit break after the standing is completed;
the first acquisition module 202 is used for carrying out dynamic impedance test on the lithium ion battery after each cycle of constant-current charging and discharging for a preset number of times to obtain test dynamic impedance data;
the second acquisition module 203 is used for testing the dynamic impedance of the lithium ion battery with the micro internal open circuit to acquire dynamic impedance data;
a determining standard module 204, which determines log (/ Z /) and log (frequency) graphs of the dynamic impedance according to the dynamic impedance data and the test dynamic impedance data, and determines a slope standard of the lithium ion battery micro-inner short circuit straight line in a preset test frequency interval according to the log (/ Z /) and log (frequency) graphs;
the testing module 205 obtains the dynamic impedance of the lithium ion battery to be tested as the testing data, determines the slope of the testing data, and determines that the lithium ion battery to be tested has a micro-internal disconnection when the slope is smaller than or equal to the slope standard.
Wherein the preset temperature range is-20-40 ℃, the preset time is 0.5-2 h, the preset times range is 80-120 times, and the preset test evaluation interval is 0.01-10 Hz.
The invention judges whether the battery has micro internal short circuit or not by testing the dynamic impedance of the battery in the charging and discharging process and taking the data as the basis, has higher accuracy, wider application range, higher efficiency and more simplicity, and can be popularized to lithium ion batteries of various systems.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein. The scheme in the embodiment of the application can be implemented by adopting various computer languages, such as object-oriented programming language Java and transliterated scripting language JavaScript.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
While the preferred embodiments of the present application have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all alterations and modifications as fall within the scope of the application.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present application without departing from the spirit and scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is intended to include such modifications and variations as well.
Claims (10)
1. A method for detecting occurrence of a micro-internal short circuit in a lithium ion battery, the method comprising:
placing the lithium ion battery without the micro-internal circuit break in an environment with a preset temperature, standing for a preset time, and performing circulating constant-current charging and discharging on the lithium ion battery with the micro-internal circuit break after standing;
after each cycle of constant current charging and discharging for a preset number of times, carrying out dynamic impedance test on the lithium ion battery to obtain test dynamic impedance data;
when the lithium ion battery is subjected to micro-internal short circuit, testing the dynamic impedance of the lithium ion battery with micro-internal open circuit to obtain dynamic impedance data;
determining log (/ Z /) and log (frequency) graphs of the dynamic impedance according to the dynamic impedance data and the test dynamic impedance data, and determining a slope standard of a short-circuit straight line in a lithium ion battery micro in a preset test frequency interval according to the log (/ Z /) and log (frequency) graphs;
and when the slope is smaller than or equal to the slope standard, determining that the lithium ion battery to be tested is subjected to micro-internal circuit breaking.
2. The method according to claim 1, wherein the preset temperature is in the range of-20 to 40 ℃.
3. The method according to claim 1, wherein the preset time period is 0.5-2 h.
4. The method of claim 1, wherein the predetermined number of times is in a range of 80-120 times.
5. The method of claim 1, wherein the predetermined test rating interval is 0.01-10 Hz.
6. A system for detecting occurrence of micro-internal short circuits in a lithium ion battery, the system comprising:
the pretreatment module is used for placing the lithium ion battery without the micro internal circuit break in an environment with a preset temperature, standing for a preset time, and performing circulating constant-current charging and discharging on the lithium ion battery with the micro internal circuit break after standing;
the first acquisition module is used for carrying out dynamic impedance test on the lithium ion battery after each cycle of constant-current charging and discharging for a preset number of times to obtain test dynamic impedance data;
the second acquisition module is used for determining the dynamic impedance of the lithium ion battery which is subjected to the micro-internal short circuit after the lithium ion battery is subjected to the test, and acquiring dynamic impedance data;
the determination standard module is used for determining log (/ Z /) and log (frequency) graphs of the dynamic impedance according to the dynamic impedance data and the test dynamic impedance data, and determining the slope standard of the short-circuit straight line in the lithium ion battery micro in the preset test frequency interval according to the log (/ Z /) and log (frequency) graphs;
and the test module is used for acquiring the dynamic impedance of the lithium ion battery to be tested as detection data, determining the slope of the detection data, and determining that the lithium ion battery to be tested is subjected to micro-internal disconnection when the slope is smaller than or equal to the slope standard.
7. The system of claim 6, wherein the preset temperature is in the range of-20 to 40 ℃.
8. The system of claim 6, wherein the preset time period is 0.5-2 h.
9. The system of claim 6, wherein the preset number of times ranges from 80 to 120 times.
10. The system of claim 6, wherein the predetermined test rating interval is 0.01-10 Hz.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010189969.3A CN111474488A (en) | 2020-03-17 | 2020-03-17 | Method and system for detecting micro internal short circuit of lithium ion battery |
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| CN202010189969.3A CN111474488A (en) | 2020-03-17 | 2020-03-17 | Method and system for detecting micro internal short circuit of lithium ion battery |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112510271A (en) * | 2020-11-27 | 2021-03-16 | 郑州大学 | Lithium ion battery real-time overcharge and thermal runaway prediction method based on dynamic impedance |
| CN112698230A (en) * | 2020-12-02 | 2021-04-23 | 国网上海市电力公司 | Method for rapidly measuring dynamic impedance of health state of lithium ion battery |
| WO2022126390A1 (en) * | 2020-12-15 | 2022-06-23 | 东莞新能德科技有限公司 | Method for detecting internal short circuit of battery, electronic device and storage medium |
| CN116047326A (en) * | 2023-01-28 | 2023-05-02 | 宁德新能源科技有限公司 | Battery state detection method and device, storage medium and electronic equipment |
-
2020
- 2020-03-17 CN CN202010189969.3A patent/CN111474488A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112510271A (en) * | 2020-11-27 | 2021-03-16 | 郑州大学 | Lithium ion battery real-time overcharge and thermal runaway prediction method based on dynamic impedance |
| CN112698230A (en) * | 2020-12-02 | 2021-04-23 | 国网上海市电力公司 | Method for rapidly measuring dynamic impedance of health state of lithium ion battery |
| WO2022126390A1 (en) * | 2020-12-15 | 2022-06-23 | 东莞新能德科技有限公司 | Method for detecting internal short circuit of battery, electronic device and storage medium |
| CN116047326A (en) * | 2023-01-28 | 2023-05-02 | 宁德新能源科技有限公司 | Battery state detection method and device, storage medium and electronic equipment |
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