CN116125294A - Lithium battery CT chromatographic detection method based on ultrasonic detection - Google Patents
Lithium battery CT chromatographic detection method based on ultrasonic detection Download PDFInfo
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- CN116125294A CN116125294A CN202211690231.0A CN202211690231A CN116125294A CN 116125294 A CN116125294 A CN 116125294A CN 202211690231 A CN202211690231 A CN 202211690231A CN 116125294 A CN116125294 A CN 116125294A
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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]
- G01R31/378—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC] specially adapted for the type of battery or accumulator
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/04—Analysing solids
- G01N29/06—Visualisation of the interior, e.g. acoustic microscopy
- G01N29/0654—Imaging
- G01N29/0672—Imaging by acoustic tomography
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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]
- G01R31/392—Determining battery ageing or deterioration, e.g. state of health
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/02—Indexing codes associated with the analysed material
- G01N2291/023—Solids
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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 invention provides a lithium battery CT chromatographic detection method based on ultrasonic detection, which can acquire the distribution condition of lithium by acquiring three-dimensional chromatographic images of the inside of a battery with different attenuation degrees on the premise of not damaging the structure of the lithium ion battery, and has the advantages of simple and convenient whole detection flow, easy realization and lower cost. When the three-dimensional tomographic images in the battery are analyzed, the detection accuracy is further improved by superposing and fusing the images of two different sources of the neutron photographing system and the CT measuring system, so that key factors affecting the service life attenuation of the lithium battery can be accurately and timely found, and a plurality of beneficial effects which are not possessed by the prior art can be achieved.
Description
Technical Field
The invention belongs to the technical field of lithium ion battery life attenuation diagnosis, and particularly relates to a lithium battery CT chromatography detection technology based on ultrasonic detection.
Background
Lithium ion batteries are used as key components of electric vehicles, and life decay during use of the lithium ion batteries has a critical effect on vehicle performance. Factors that lead to degradation of lithium battery life are numerous, such as: the phenomena of lithium precipitation, thickening of the SEI film on the surface of the negative electrode, secondary damage caused by charging and discharging, damage of the structure of an active substance and the like are likely to cause the shortening of the service life of the lithium battery, but because the reaction mechanism of the phenomena is complex, partial information related to the service life is difficult to calculate and acquire, and therefore, the phenomena cannot be effectively utilized to realize more accurate service life degradation detection. In the prior art, neutron diffraction, X-Ray detection and ultrasonic detection means commonly used in the metal nondestructive detection field are utilized, and the service life attenuation condition of the battery is obtained by detecting the internal structure or reaction of the lithium battery, however, the defects of complex implementation process, high cost and the like of the means generally exist, and particularly, necessary radiation protection measures are required to be arranged in the neutron diffraction and X-Ray detection. Therefore, how to provide a more accurate, relatively simple and low-cost lithium battery life decay detection method is an urgent technical problem in the art.
Disclosure of Invention
In view of the above, the invention provides a lithium battery CT chromatography detection method based on ultrasonic detection, which specifically comprises the following steps:
step one, performing accelerated aging test on a lithium ion battery at room temperature, and respectively acquiring three-dimensional tomographic images of the interior of the lithium ion battery in different life attenuation stages by utilizing a neutron photographing system and a CT measuring system;
step two, the two three-dimensional tomographic images in the battery, which are acquired in the step one and are in the same life attenuation stage, are mutually overlapped to obtain overlapped three-dimensional tomographic images in the battery, which correspond to different life attenuation stages;
and thirdly, analyzing the distribution conditions of lithium in different positions in the three-dimensional chromatographic image of the battery interior obtained in the second step, and determining key factors influencing the service life of the lithium battery according to the correlation between the distribution conditions and the service life decay of the lithium battery.
Further, the accelerated aging test in the first step is specifically implemented by adopting the following constant-current-constant-voltage charge and discharge process:
firstly, discharging a lithium ion battery to 2.0V at a constant current of 1C in a constant temperature environment of 25 ℃, and standing for 1 hour; then charging to 3.65V with a constant current of 1C, converting to constant voltage charging until the charging current is reduced to 0.05C, stopping charging, and standing for 1 hour; the above cycle is repeated N times, n=200, 400, 600 … being selectable.
Further, in the second step, according to the number of cycles N undergone by the same accelerated aging test, for example, n=200 cycles are selectively executed to obtain two three-dimensional tomographic images of the interior of the battery at the same life attenuation stage respectively;
further, the analysis of the distribution of lithium at different positions in the third step specifically includes analysis of the concentration, shape and position information of lithium in the three-dimensional tomographic image of the interior of the battery.
Further, in the first step, when a neutron photographing system is used for obtaining a three-dimensional tomographic image of the interior of the lithium ion battery, neutron rays are specifically set to be incident perpendicular to the surface of the lithium ion battery, and the imaging area is 10cm multiplied by 10cm.
And in the second step, the two three-dimensional tomographic images inside the battery are obtained by MATLAB software.
According to the ultrasonic detection-based lithium battery CT chromatographic detection method provided by the invention, the distribution condition of lithium can be obtained by collecting the three-dimensional chromatographic images of the inside of the battery with different attenuation degrees on the premise of not damaging the structure of the lithium ion battery, and the whole detection flow is simple and easy to realize and has lower cost. When the three-dimensional tomographic images in the battery are analyzed, the detection accuracy is further improved by superposing and fusing the images of two different sources of the neutron photographing system and the CT measuring system, so that key factors affecting the service life attenuation of the lithium battery can be accurately and timely found, and a plurality of beneficial effects which are not possessed by the prior art can be achieved.
Drawings
FIG. 1 is a multi-directional chromatogram at a lithium battery negative aluminum foil obtained in an example according to the present invention;
FIG. 2 is a multi-directional chromatogram at the positive copper foil of a lithium battery obtained in an example according to the present invention;
FIG. 3 is a multi-directional chromatogram at the negative copper foil of a lithium battery obtained in an example according to the present invention;
FIG. 4 is a multi-directional chromatogram at the copper powder of the negative electrode of a lithium battery obtained in an example according to the invention;
fig. 5 is a multi-directional chromatogram at the positive copper powder of a lithium battery obtained in an example according to the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the invention are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The invention provides a lithium battery CT chromatography detection method based on ultrasonic detection, which specifically comprises the following steps:
step one, performing accelerated aging test on a lithium ion battery at room temperature, and respectively acquiring three-dimensional tomographic images of the interior of the lithium ion battery in different life attenuation stages by utilizing a neutron photographing system and a CT measuring system;
step two, the two three-dimensional tomographic images in the battery, which are acquired in the step one and are in the same life attenuation stage, are mutually overlapped to obtain overlapped three-dimensional tomographic images in the battery, which correspond to different life attenuation stages;
and thirdly, analyzing the distribution conditions of lithium in different positions in the three-dimensional chromatographic image of the battery interior obtained in the second step, and determining key factors influencing the service life of the lithium battery according to the correlation between the distribution conditions and the service life decay of the lithium battery.
In a preferred embodiment of the present invention, the accelerated aging test in the first step is specifically implemented by using the following constant current-constant voltage charge-discharge process:
firstly, discharging a lithium ion battery to 2.0V at a constant current of 1C in a constant temperature environment of 25 ℃, and standing for 1 hour; then charging to 3.65V with a constant current of 1C, converting to constant voltage charging until the charging current is reduced to 0.05C, stopping charging, and standing for 1 hour; the above cycle is repeated N times, n=200, 400, 600 … being selectable.
In a preferred embodiment of the present invention, in the second step, the two three-dimensional tomographic images of the interior of the battery in the same life-span attenuation stage are obtained respectively, specifically according to the number N of cycles undergone by the same accelerated aging test, for example, by selecting to execute n=200 cycles;
in a preferred embodiment of the present invention, the analysis of the distribution of lithium at different positions in step three specifically includes analysis of concentration, shape and position information of lithium in a three-dimensional tomographic image of the interior of the battery.
In a preferred embodiment of the present invention, in the first step, when a neutron photographing system is used to obtain a three-dimensional tomographic image of the interior of the lithium ion battery, the neutron rays are specifically set to be incident perpendicular to the surface of the lithium ion battery, and the imaging area is 10cm×10cm. The imaging principle is well known to those skilled in the art: the neutron rays pass through the lithium ion battery, at the moment, neutrons interact with atomic nuclei in the lithium ion battery, light emitted by the transmitted neutrons on the scintillation screen is reflected to the lens by the reflecting mirror, and then the light is focused on the CCD camera, so that a three-dimensional tomographic image of the interior of the lithium ion battery is obtained.
In a preferred embodiment of the present invention, in the second step, the two three-dimensional tomographic images of the interior of the battery are obtained by using MATLAB software to obtain the superimposed three-dimensional tomographic image of the interior of the battery. Those skilled in the art will appreciate that the superimposed three-dimensional tomographic images described above can be obtained in a variety of ways other than MATLAB software.
Fig. 1-5 show a preferred embodiment of the present invention, wherein the distribution of lithium at different positions of a lithium battery obtained by overlapping after being collected by a neutron photographing system and a CT measuring system is used, and important correlation information can be obtained by analyzing the distribution of lithium at different attenuation stages, which is beneficial to guiding the subsequent lithium battery life attenuation monitoring for real vehicle use.
It should be understood that, the sequence number of each step in the embodiment of the present invention does not mean that the execution sequence of each process should be determined by the function and the internal logic of each process, and should not limit the implementation process of the embodiment of the present invention.
Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (6)
1. A CT chromatographic detection method of a lithium battery based on ultrasonic detection is characterized in that: the method specifically comprises the following steps:
step one, performing accelerated aging test on a lithium ion battery at room temperature, and respectively acquiring three-dimensional tomographic images of the interior of the lithium ion battery in different life attenuation stages by utilizing a neutron photographing system and a CT measuring system;
step two, the two three-dimensional tomographic images in the battery, which are acquired in the step one and are in the same life attenuation stage, are mutually overlapped to obtain overlapped three-dimensional tomographic images in the battery, which correspond to different life attenuation stages;
and thirdly, analyzing the distribution conditions of lithium in different positions in the three-dimensional chromatographic image of the battery interior obtained in the second step, and determining key factors influencing the service life of the lithium battery according to the correlation between the distribution conditions and the service life decay of the lithium battery.
2. The method of claim 1, wherein: the accelerated aging test in the first step is specifically realized by adopting the following constant-current-constant-voltage charge and discharge process:
firstly, discharging a lithium ion battery to 2.0V at a constant current of 1C in a constant temperature environment of 25 ℃, and standing for 1 hour; then charging to 3.65V with a constant current of 1C, converting to constant voltage charging until the charging current is reduced to 0.05C, stopping charging, and standing for 1 hour; the above cycle was repeated N times.
3. The method of claim 2, wherein: and in the second step, two three-dimensional tomographic images of the interior of the battery in the same life attenuation stage are respectively obtained according to the cycle times N of the same accelerated aging test.
4. The method of claim 1, wherein: and in the third step, analyzing the distribution situation of lithium at different positions specifically comprises analyzing the concentration, shape and position information of lithium in the three-dimensional tomographic image of the interior of the battery.
5. The method of claim 1, wherein: in the first step, when a neutron photographing system is used for obtaining a three-dimensional tomographic image of the interior of the lithium ion battery, the neutron rays are specifically arranged to be perpendicular to the surface of the lithium ion battery and incident, and the imaging area is 10cm multiplied by 10cm.
6. The method of claim 1, wherein: and step two, obtaining the three-dimensional tomographic images of the interior of the battery after superposition by utilizing MATLAB software.
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| CN202211690231.0A CN116125294A (en) | 2022-12-27 | 2022-12-27 | Lithium battery CT chromatographic detection method based on ultrasonic detection |
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| CN202211690231.0A CN116125294A (en) | 2022-12-27 | 2022-12-27 | Lithium battery CT chromatographic detection method based on ultrasonic detection |
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| CN116125294A true CN116125294A (en) | 2023-05-16 |
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| CN202211690231.0A Pending CN116125294A (en) | 2022-12-27 | 2022-12-27 | Lithium battery CT chromatographic detection method based on ultrasonic detection |
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Effective date of registration: 20230718 Address after: Room 102, Building 2, No. 2688 Xiangshan Road, Tangjiawan Town, High tech Zone, Zhuhai City, Guangdong Province, 519085 Applicant after: Qingneng Bochuang (Zhuhai) Technology Co.,Ltd. Address before: Room 301, 3rd Floor, Building B, Yard 31, Wangfu Street, Beiqijia Town, Changping District, Beijing, 102200 Applicant before: Xiang Yong |