CN113777516A - Method and device for judging abnormal battery cell - Google Patents
Method and device for judging abnormal battery cell Download PDFInfo
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- CN113777516A CN113777516A CN202110850651.XA CN202110850651A CN113777516A CN 113777516 A CN113777516 A CN 113777516A CN 202110850651 A CN202110850651 A CN 202110850651A CN 113777516 A CN113777516 A CN 113777516A
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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]
- G01R31/385—Arrangements for measuring battery or accumulator 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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Abstract
The application discloses a method and a device for judging abnormal unit battery cells, wherein the method is applied to a laminated lithium ion battery and used for acquiring open-circuit voltages of all unit battery cells; each unit cell comprises every N adjacent electrodes of the laminated lithium ion battery processed by the insulating sheet inserting sheet; for each unit cell, if the open-circuit voltage of the unit cell meets a preset condition, the unit cell is determined to be an abnormal unit cell. The method and the device for judging the abnormal unit cell solve the problem that an abnormal point cannot be found after the low-voltage battery is decomposed.
Description
Technical Field
The present application relates to the field of lithium ion battery technologies, and in particular, to a method and an apparatus for determining an abnormal electrical core.
Background
The current low voltage analysis method of lithium ion batteries is as follows: the method comprises the steps of recording the open-circuit voltage OCV1 at the beginning of placing of the lithium ion battery, measuring the open-circuit voltage OCV2 on the 3 rd day or the 7 th day respectively, calculating delta OCV (OCV 2-OCV 1), formulating a reasonable delta OCV specification, then carrying out gradual disassembly analysis on an unconventional battery cell, and aiming at the decomposition process of the laminated battery, checking whether the diaphragm is abnormal or not after decomposition by a specific method, wherein the electrode surface is abnormal or not, and belongs to destructive analysis.
Disclosure of Invention
The application provides a method and a device for judging an abnormal electric core, which solve the problem that an abnormal point cannot be found after a low-voltage battery is decomposed.
The application provides a method for judging an abnormal unit cell, which is applied to a laminated lithium ion battery and comprises the following steps:
acquiring open-circuit voltages of all unit battery cores; each unit cell comprises every N adjacent electrodes of the laminated lithium ion battery processed by the insulating sheet inserting sheet; wherein N is an even number greater than 0;
for each unit cell, if the open-circuit voltage of the unit cell meets a preset condition, the unit cell is determined to be an abnormal unit cell.
In one exemplary embodiment, N is 2.
In an exemplary embodiment, the insulation sheet insert sheet process is performed on the laminated lithium ion battery as follows:
and an insulating gasket is inserted between every two adjacent positive electrode tabs and between every two adjacent negative electrode tabs.
In an exemplary embodiment, the preset condition includes:
the open-circuit voltage of the unit cell is greater than a first threshold value or less than a second threshold value;
the first threshold is the sum of the average value of the open-circuit voltages of all the unit battery cells and the standard deviation sigma of the open-circuit voltages which is 3 times of the average value;
the second threshold value is a difference between the average value of the open-circuit voltages of all the unit cells and the standard deviation σ of the open-circuit voltages of 3 times.
In one exemplary embodiment, the open circuit voltage standard deviation σ is calculated as follows:
wherein μ is an average value of open-circuit voltages of all the unit cells, and Xi is an open-circuit voltage of the ith unit cell; and N is the number of all unit cells.
The application provides a device for judging an abnormal unit cell, which is applied to a laminated lithium ion battery and comprises a memory and a processor;
the memory is used for storing a program for judging the abnormal unit cell;
the processor is configured to read and execute the program for determining the abnormal unit cell, and execute the following operations:
acquiring open-circuit voltages of all unit battery cores; each unit cell consists of every N adjacent electrodes of the laminated lithium ion battery after being processed by the insulating sheet inserting sheet; wherein N is an even number greater than 0;
for each unit cell, if the open-circuit voltage of the unit cell meets a preset condition, the unit cell is determined to be an abnormal unit cell.
In one exemplary embodiment, N is 2.
In an exemplary embodiment, the insulation sheet insert sheet process is performed on the laminated lithium ion battery as follows:
and an insulating gasket is inserted between every two adjacent positive electrode tabs and between every two adjacent negative electrode tabs.
In an exemplary embodiment, the preset condition includes:
the open-circuit voltage of the unit cell is greater than a first threshold value or less than a second threshold value;
the first threshold is the sum of the average value of the open-circuit voltages of all the unit battery cells and 3 times of the standard deviation of the open-circuit voltages;
the second threshold is a difference between an average value of open-circuit voltages of all the unit cells and 3 times of a standard deviation of the open-circuit voltages.
In one exemplary embodiment, the open circuit voltage standard deviation σ is calculated as follows:
wherein μ is an average value of open-circuit voltages of all the unit cells, and Xi is an open-circuit voltage of the ith unit cell; and N is the number of all unit cells.
According to the embodiment of the application, the open-circuit voltage of all the unit battery cells is measured, the open-circuit voltage of each unit battery cell is compared with the preset threshold value, the abnormal chip can be determined, and the problem that the abnormal point cannot be found after the low-voltage battery is decomposed is solved.
Additional features and advantages of the application will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by the practice of the application. Other advantages of the present application may be realized and attained by the instrumentalities and combinations particularly pointed out in the specification and the drawings.
Drawings
The accompanying drawings are included to provide an understanding of the present disclosure and are incorporated in and constitute a part of this specification, illustrate embodiments of the disclosure and together with the examples serve to explain the principles of the disclosure and not to limit the disclosure.
Fig. 1 is a flowchart of a method for determining an abnormal cell electric core according to an embodiment of the present application;
fig. 2 is a schematic diagram of an open-circuit voltage of a test unit cell according to an embodiment of the present application;
fig. 3 is a schematic diagram of a device for determining an abnormal cell electric core according to an embodiment of the present application.
Detailed Description
Fig. 1 is a flowchart of determining an abnormal cell in the embodiment of the present application, and as shown in fig. 1, the method for determining an abnormal cell in the embodiment includes steps S11-S12:
s11, acquiring open-circuit voltages of all unit battery cells;
s12, for each unit cell, if the open-circuit voltage of the unit cell meets a preset condition, determining the unit cell as an abnormal unit cell;
in an exemplary embodiment, each unit cell includes every N adjacent electrodes of the laminated lithium ion battery processed by the insulating sheet tabs. Wherein N is an even number greater than 0. The purpose of the electrode is processed by the insulating sheet insert sheet is to prevent adjacent electrodes from being interfered in parallel.
In an exemplary embodiment, N may be 2. In some other exemplary embodiments, N may be 4, or some other even value. In this way, after the unit cell is determined to be an abnormal cell, the unit cell can include every two adjacent electrodes of the laminated lithium ion battery processed by the insulating sheet inserting piece, and the determination process of the abnormal battery can be accelerated.
In an exemplary embodiment, the insulation sheet insert sheet process is performed on the laminated lithium ion battery as follows: and an insulating gasket is inserted between every two adjacent positive electrode tabs and between every two adjacent negative electrode tabs.
In an exemplary embodiment, the preset condition includes:
the open-circuit voltage of the unit cell is greater than a first threshold value or less than a second threshold value.
In an exemplary embodiment, the first threshold is a sum of an average value of open circuit voltages of all the unit cells and 3 times of an open circuit voltage standard deviation σ; the second threshold value is a difference between the average value of the open-circuit voltages of all the unit cells and the standard deviation σ of the open-circuit voltages of 3 times.
In one exemplary embodiment, the open circuit voltage standard deviation σ is calculated as follows:
wherein μ is an average value of open-circuit voltages of all the unit cells, and Xi is an open-circuit voltage of the ith unit cell; and N is the number of all unit cells.
The method for judging the abnormal unit cell solves the problem that the abnormal point cannot be found after the low-voltage battery is decomposed, thereby laying a foundation for analyzing the abnormal unit cell and improving the cell quality.
Fig. 2 is a schematic diagram of a cell open-circuit voltage of a test unit according to an embodiment of the present application, and as shown in fig. 2, fig. 2 includes a laminated lithium ion battery cell, a voltage test meter, and an insulating spacer.
The long rectangle in fig. 2 represents a negative electrode sheet, the short rectangle represents a positive electrode sheet, the short line segment connected to the positive electrode sheet or the negative electrode sheet represents a positive electrode tab or a negative electrode tab, respectively, and the long line segment connected to the positive electrode sheet or the negative electrode sheet represents an insulating sheet. The laminated lithium ion battery cell is processed by the insulating sheet inserting sheet. Namely, an insulating sheet is inserted between every two adjacent positive electrode lugs to separate the two positive electrode lugs; an insulating sheet is inserted between every two adjacent negative electrode tabs to separate the two negative electrode tabs. And finally segmenting the structure of each unit cell in the cell. As shown in fig. 2, the whole lamination lithium ion battery cell can be subjected to insulation sheet insert treatment, and also can be subjected to insulation sheet insert treatment aiming at the pole piece to be tested during open circuit voltage OCV test, so as to electrically insulate the pole piece to be tested from other pole pieces.
And the voltage test meter is used for carrying out open circuit voltage OCV test. The OCV test procedure is as follows: the open circuit voltage OCV1 between + r and-r was tested, the open circuit voltage OCV2 between + r and-r was tested, the open circuit voltage OCV3 between-r and + r was tested, and the open circuit voltage OCV4 … … between + n and-n was tested.
After testing the complete pole piece OCV, consistency analysis was performed on all test data using Sigma principles by calculating the OCV average μ ═ (OCV1+ OCV2+ OCV3+ … … + OCVn)/n, calculating the open circuit voltage standard deviation Sigma:
where μ is the OCV average and Xi is the respective OCV measured. Open-circuit voltages OCV1, OCV2, OCV3 and OCV4 … … OCVn are used as a graph, wherein the upper limit specification is mu +3 sigma, the lower limit specification is mu-3 sigma, pole pieces at positions corresponding to the OCVs exceeding the upper limit or the lower limit are marked, and then the marked points are directly analyzed to be low-voltage abnormal occurrence positions when the cell is disassembled, so that occurrence reasons are obtained, the occurrence reasons are improved, and the quality of the cell is improved.
Fig. 3 is a schematic view of the apparatus for determining an abnormal unit cell according to the embodiment of the present application, and as shown in fig. 3, the apparatus for determining an abnormal unit cell according to the embodiment includes a memory and a processor.
The memory is used for storing a program for judging the abnormal unit cell;
the processor is configured to read and execute the program for determining the abnormal unit cell, and execute the following operations:
in an exemplary embodiment, each unit cell includes every N adjacent electrodes of the laminated lithium ion battery processed by the insulating sheet tabs. Wherein N is an even number greater than 0. The purpose of the electrode is processed by the insulating sheet insert sheet is to prevent adjacent electrodes from being interfered in parallel.
In an exemplary embodiment, N may be 2. In some other exemplary embodiments, N may be 4, or some other even value. In this way, after the unit cell is determined to be an abnormal cell, the unit cell can include every two adjacent electrodes of the laminated lithium ion battery processed by the insulating sheet inserting piece, and the determination process of the abnormal battery can be accelerated.
In an exemplary embodiment, the insulation sheet insert sheet process is performed on the laminated lithium ion battery as follows: and an insulating gasket is inserted between every two adjacent positive electrode tabs and between every two adjacent negative electrode tabs.
In an exemplary embodiment, the preset condition includes: the open-circuit voltage of the unit cell is greater than a first threshold value or less than a second threshold value.
In an exemplary embodiment, the first threshold is a sum of an average value of open circuit voltages of all the unit cells and 3 times of an open circuit voltage standard deviation σ; the second threshold value is a difference between the average value of the open-circuit voltages of all the unit cells and the standard deviation σ of the open-circuit voltages of 3 times.
In one exemplary embodiment, the open circuit voltage standard deviation σ is calculated as follows:
wherein μ is an average value of open-circuit voltages of all the unit cells, and Xi is an open-circuit voltage of the ith unit cell; and N is the number of all unit cells.
The application provides a judge device of unusual unit electric core solves the problem that can not find the abnormal point after the low voltage battery decomposes to establish the basis for analyzing unusual unit electric core, improved the electric core quality.
The present application describes embodiments, but the description is illustrative rather than limiting and it will be apparent to those of ordinary skill in the art that many more embodiments and implementations are possible within the scope of the embodiments described herein. Although many possible combinations of features are shown in the drawings and discussed in the detailed description, many other combinations of the disclosed features are possible. Any feature or element of any embodiment may be used in combination with or instead of any other feature or element in any other embodiment, unless expressly limited otherwise.
The present application includes and contemplates combinations of features and elements known to those of ordinary skill in the art. The embodiments, features and elements disclosed in this application may also be combined with any conventional features or elements to form a unique inventive concept as defined by the claims. Any feature or element of any embodiment may also be combined with features or elements from other inventive aspects to form yet another unique inventive aspect, as defined by the claims. Thus, it should be understood that any of the features shown and/or discussed in this application may be implemented alone or in any suitable combination. Accordingly, the embodiments are not limited except as by the appended claims and their equivalents. Furthermore, various modifications and changes may be made within the scope of the appended claims.
Further, in describing representative embodiments, the specification may have presented the method and/or process as a particular sequence of steps. However, to the extent that the method or process does not rely on the particular order of steps set forth herein, the method or process should not be limited to the particular sequence of steps described. Other orders of steps are possible as will be understood by those of ordinary skill in the art. Therefore, the particular order of the steps set forth in the specification should not be construed as limitations on the claims. Further, the claims directed to the method and/or process should not be limited to the performance of their steps in the order written, and one skilled in the art can readily appreciate that the sequences may be varied and still remain within the spirit and scope of the embodiments of the present application.
It will be understood by those of ordinary skill in the art that all or some of the steps of the methods, systems, functional modules/units in the devices disclosed above may be implemented as software, firmware, hardware, and suitable combinations thereof. In a hardware implementation, the division between functional modules/units mentioned in the above description does not necessarily correspond to the division of physical components; for example, one physical component may have multiple functions, or one function or step may be performed by several physical components in cooperation. Some or all of the components may be implemented as software executed by a processor, such as a digital signal processor or microprocessor, or as hardware, or as an integrated circuit, such as an application specific integrated circuit. Such software may be distributed on computer readable media, which may include computer storage media (or non-transitory media) and communication media (or transitory media). The term computer storage media includes volatile and nonvolatile, removable and non-removable media implemented in any method or technology for storage of information such as computer readable instructions, data structures, program modules or other data, as is well known to those of ordinary skill in the art. Computer storage media includes, but is not limited to, RAM, ROM, EEPROM, flash memory or other memory technology, CD-ROM, Digital Versatile Disks (DVD) or other optical disk storage, magnetic cassettes, magnetic tape, magnetic disk storage or other magnetic storage devices, or any other medium which can be used to store the desired information and which can accessed by a computer. In addition, communication media typically embodies computer readable instructions, data structures, program modules or other data in a modulated data signal such as a carrier wave or other transport mechanism and includes any information delivery media as known to those skilled in the art.
Claims (10)
1. A method for judging abnormal unit cell is applied to a laminated lithium ion battery and is characterized in that,
acquiring open-circuit voltages of all unit battery cores; each unit cell comprises every N adjacent electrodes of the laminated lithium ion battery processed by the insulating sheet inserting sheet; wherein N is an even number greater than 0;
for each unit cell, if the open-circuit voltage of the unit cell meets a preset condition, the unit cell is determined to be an abnormal unit cell.
2. The method of claim 1, wherein:
n is 2.
3. The method of claim 2, wherein:
the laminated lithium ion battery is subjected to insulation sheet inserting sheet treatment in the following way:
and an insulating gasket is inserted between every two adjacent positive electrode tabs and between every two adjacent negative electrode tabs.
4. The method of claim 3, wherein:
the preset conditions include:
the open-circuit voltage of the unit cell is greater than a first threshold value or less than a second threshold value;
the first threshold is the sum of the average value of the open-circuit voltages of all the unit battery cells and the standard deviation sigma of the open-circuit voltages which is 3 times of the average value;
the second threshold value is a difference between the average value of the open-circuit voltages of all the unit cells and the standard deviation σ of the open-circuit voltages of 3 times.
5. The method of claim 4, wherein:
the open circuit voltage standard deviation σ is calculated according to the following formula:
wherein μ is an average value of open-circuit voltages of all the unit cells, and Xi is an open-circuit voltage of the ith unit cell; and N is the number of all unit cells.
6. The utility model provides a judge device of unusual unit electricity core, is applied to lamination lithium ion battery, includes memory and treater, its characterized in that:
the memory is used for storing a program for judging the abnormal unit cell;
the processor is configured to read and execute the program for determining the abnormal unit cell, and execute the following operations:
acquiring open-circuit voltages of all unit battery cores; each unit cell consists of every N adjacent electrodes of the laminated lithium ion battery after being processed by the insulating sheet inserting sheet; wherein N is an even number greater than 0;
for each unit cell, if the open-circuit voltage of the unit cell meets a preset condition, the unit cell is determined to be an abnormal unit cell.
7. The apparatus of claim 6, wherein:
n is 2.
8. The apparatus of claim 7, wherein:
the laminated lithium ion battery is subjected to insulation sheet inserting sheet treatment in the following way:
and an insulating gasket is inserted between every two adjacent positive electrode tabs and between every two adjacent negative electrode tabs.
9. The apparatus of claim 8, wherein:
the preset conditions include:
the open-circuit voltage of the unit cell is greater than a first threshold value or less than a second threshold value;
the first threshold is the sum of the average value of the open-circuit voltages of all the unit battery cells and 3 times of the standard deviation of the open-circuit voltages;
the second threshold is a difference between an average value of open-circuit voltages of all the unit cells and 3 times of a standard deviation of the open-circuit voltages.
10. The apparatus of claim 9, wherein:
the open circuit voltage standard deviation σ is calculated according to the following formula:
wherein μ is an average value of open-circuit voltages of all the unit cells, and Xi is an open-circuit voltage of the ith unit cell; and N is the number of all unit cells.
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| GB2623892A (en) * | 2022-10-25 | 2024-05-01 | Autocraft Solutions Group Ltd | Method and system for determining reusability of a battery |
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