CN116140238A - Method for detecting battery tab defects - Google Patents
Method for detecting battery tab defects Download PDFInfo
- Publication number
- CN116140238A CN116140238A CN202211690070.5A CN202211690070A CN116140238A CN 116140238 A CN116140238 A CN 116140238A CN 202211690070 A CN202211690070 A CN 202211690070A CN 116140238 A CN116140238 A CN 116140238A
- Authority
- CN
- China
- Prior art keywords
- battery
- detected
- defects
- threshold value
- detecting
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07C—POSTAL SORTING; SORTING INDIVIDUAL ARTICLES, OR BULK MATERIAL FIT TO BE SORTED PIECE-MEAL, e.g. BY PICKING
- B07C5/00—Sorting according to a characteristic or feature of the articles or material being sorted, e.g. by control effected by devices which detect or measure such characteristic or feature; Sorting by manually actuated devices, e.g. switches
- B07C5/34—Sorting according to other particular properties
- B07C5/344—Sorting according to other particular properties according to electric or electromagnetic properties
-
- 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
Abstract
The invention discloses a method for detecting defects of battery lugs, which comprises the following steps: step one, obtaining a current threshold value of a qualified battery; step two, electrifying a battery to be detected, and obtaining a current diagram of the battery to be detected; and thirdly, comparing the current diagram of the battery to be detected with a current threshold value of the qualified electromagnetic to obtain an unqualified battery with the defects of the electrode lugs. The detection method also carries out additional detection on the welding condition of the battery tab by ultrasonic so as to increase the detection accuracy.
Description
Technical Field
The invention relates to the technical field of battery detection, in particular to a method for detecting defects of battery lugs.
Background
The battery, especially the lithium ion battery, has the characteristics of high output voltage, high energy density, long cycle life, good safety performance, no memory effect and the like, and is widely applied to various fields as a main energy storage device. The tab welding process is a key part in the whole production process chain of the lithium battery core, the welding quality and the welding precision of the tab welding process can influence the performance and the service life of the whole lithium battery core, and serious cases can directly lead to scrapping of products. The tab of the conventional soft-packaged battery core is of a sheet-shaped and soft multi-layer structure, and common welding modes include laser welding, ultrasonic welding and the like, and the common welding modes are easy to cause defects of wrinkling, breakage, turnover and the like due to procedures of clamping, knife pressing, folding and the like in the welding process. At present, the defect detection generated after tab welding in China mainly depends on manual experience and naked eye detection and judgment, lacks a corresponding and comparative system defect detection rule to guide, is greatly affected by artificial subjective factors, and is difficult to ensure the accuracy and efficiency of detection.
Disclosure of Invention
Aiming at the technical problems, the invention provides a detection method for the defects of the battery lugs, and the detection method can be used for effectively detecting the defects of the battery lugs.
The invention provides a method for detecting defects of battery lugs, which comprises the following steps: step one, obtaining a current threshold value of a qualified battery; step two, electrifying a battery to be detected, and obtaining a current diagram of the battery to be detected; and thirdly, comparing the current diagram of the battery to be detected with a current threshold value of the qualified electromagnetic to obtain an unqualified battery with the defects of the electrode lugs.
Preferably, in the first step, the current threshold value for the qualified battery includes a maximum threshold value and a minimum threshold value.
Preferably, in the third step, when the highest value of the current diagram of the battery to be detected is higher than the maximum threshold value or the lowest value of the current diagram of the battery to be detected is lower than the minimum threshold value, it is determined that the electromagnetic to be detected is not qualified, and there is a risk of poor welding of the battery tab.
Preferably, the method further comprises the following steps:
step four, simulating amplitude damage to the same battery to be detected;
and fifthly, detecting the battery tab by ultrasonic rays, and observing whether the tab has cracks.
Preferably, after the battery to be detected is subjected to the simulated amplitude destruction in the fourth step, the battery is kept stand, and then the fifth step is performed.
Preferably, in the fifth step, the ultrasonic ray machine is used for performing C scanning transmission on the welding position of the battery tab after standing;
after the ultrasonic rays penetrate through the welding position, rays with different intensities are projected on the fluorescent screen coated with fluorescent substances, and fluorescence with different intensities is excited, so that an image of an object is obtained.
Preferably, further, the image on the screen in the image projection is scanned and captured by the camera, and at the same time, whether or not there is a defective state in the welding position is observed by image analysis;
and screening out unqualified products through shooting, scanning and analyzing.
Preferably, in the fourth step, the step: and sequentially performing first vibration simulation and second vibration simulation on the battery to be detected, wherein the vibration frequency used in the second vibration simulation is increased on the basis of the vibration frequency value in the first vibration simulation, and the vibration time is reduced.
The detection method has the following beneficial effects:
1. based on detect and research and development to lithium cell utmost point ear ultrasonic welding technique, through first vibration simulation and second vibration simulation through different experimental time and vibration frequency simulation transportation or unloading process can be to the injury that the battery caused, and make the battery have enough reaction time to the destruction simulation after through the process of standing, detect it again, observe whether there are welding failure conditions such as crack in utmost point ear welding position, avoid the transportation to the battery that utmost point ear welding position is not tight produces the harm, thereby cause battery resistance unusual, influence result of use, further ensured brand quality and public praise.
2. The battery is inspected through an analysis current diagram and an ultrasonic ray flaw detection dual inspection mode based on detection and research and development of an ultrasonic welding technology for the electrode lugs of the lithium battery, the analysis current diagram can be compared with the inspection current diagram through a standard threshold value to detect the voltage condition of the battery, ultrasonic ray flaw detection penetrates the battery through ultrasonic rays, and the welding condition is analyzed through analysis images, so that the ultrasonic welding inspection device has the advantages of high-speed inspection and low cost, and can further ensure the multi-aspect inspection result of the battery by matching the analysis current diagram with the ultrasonic ray flaw detection dual inspection mode, and ensure the quality of products.
3. The method is based on detection and research and development of ultrasonic welding technology for the lithium battery tab, defective product images are recorded, images of defective products projected on a fluorescent screen are recorded while defective products are screened out, archiving is carried out, the method can be used as a basis and a foundation for problem analysis in the future, data analysis is facilitated, and a production process is improved better.
Drawings
FIG. 1 is a flowchart of the battery tab defect detection method according to the present invention;
FIG. 2 is a flow chart of the current acquisition for a battery according to the present invention;
FIG. 3 is a flow chart of an analytical current diagram according to the present invention;
fig. 4 is a flowchart of a destruction simulation for a battery to be detected according to the present invention;
fig. 5 is a flowchart of ultrasonic radiographic inspection for a battery to be inspected according to the present invention.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present application are shown in the drawings, it should be understood that the present application may be embodied in various forms and should not be limited to the specific embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
Referring to fig. 1, a method for detecting poor welding of tabs of a lithium iron phosphate battery includes the following specific steps:
s1: selecting a lithium iron phosphate battery: selecting a batch of lithium iron phosphate batteries to be detected, and placing a region to be detected to wait for detection;
s2: acquiring a current diagram: electrifying a battery to be detected, and monitoring in real time through an instrument to obtain a current diagram after the battery to be detected is electrified;
s3: analysis of the current diagram: acquiring a current threshold of a qualified battery, and taking the current threshold as an analysis basis for rapid comparison detection;
s4: destructive simulation: performing certain degree of simulation amplitude damage on the same batch of batteries;
s5: standing: placing the broken simulation in a warehouse for standing for a period of time so as to have enough reaction time for the broken simulation;
s6: x-ray flaw detection: taking out the standing battery, detecting the battery by X-rays, and observing whether the battery has cracks or not.
Referring to fig. 2-3, in the present invention, in S2, acquiring a current map specifically includes the steps of:
s21: finding out the position of a battery tab;
s22: and (3) electrifying: connecting the anode and the cathode of the battery, and introducing specific voltage into the battery;
s23: current monitoring: monitoring an internal current curve of the battery after being electrified by a current monitor to obtain a current diagram;
s3, analyzing the current diagram specifically comprises the following steps:
s31: template current diagram acquisition: taking a plurality of combined cell batteries, and recording a current curve of the combined cell batteries under a specific voltage by electrifying the batteries;
s32: analysis threshold: analyzing a plurality of current curves obtained in the template current diagram obtaining step, and extracting the lowest threshold value and the highest threshold value of the current curves as comparison templates;
s33: alignment monitoring current diagram: comparing the current graph monitored in the current monitoring step with the lowest threshold value and the highest threshold value obtained in the threshold analysis step, and removing unqualified products;
in S33, the specific comparison method for comparing the current diagram of the monitoring is to intercept the highest value and the lowest value of the current diagram in the current monitoring step, and when the highest value is higher than the highest threshold value obtained in the analysis threshold value step or when the lowest value is lower than the lowest threshold value obtained in the analysis threshold value step, alarm is given, and the battery is picked out, so that the unstable voltage of the battery is displayed, and the risk of poor welding of the battery tab exists.
Referring to fig. 4, in the present invention, in S4, the destruction simulation includes the steps of:
s41: selecting the same batch of batteries: selecting qualified batteries of the same production batch after the step of analyzing the current diagram;
s42: first vibration simulation: placing the selected batteries in the same batch in a simulator, giving a certain amount of vibration to simulate possible vibration damage in the transportation process;
s43: second vibration simulation: after the first vibration simulation, continuing to simulate the vibration of the battery to a second different degree through the simulator;
in S42, the vibration frequency used in the first vibration simulation is set according to the individual package weight value, and when the individual package weight is less than 68KG, the formula is as follows: experimental time = 14200 times/(f 60) calculation, when the single package weight is greater than 68KG, according to the formula: experimental time = 11800 times/(f 60) calculation, where f represents the vibration frequency in Hz;
in S43, the vibration frequency used in the second vibration simulation is increased based on the vibration frequency value in the first vibration simulation, the experimental time is reduced, so as to simulate vibration damage in the unloading process, the transportation process or the unloading process can be simulated through different experimental times and vibration frequencies by the first vibration simulation and the second vibration simulation, the damage to the battery is caused, after the battery has enough reaction time to the damage simulation through the standing process, the battery is detected, whether welding defects such as cracks exist at the welding position of the tab or not is observed, damage to the battery with an imprecise welding position of the tab in the transportation process is avoided, thereby causing abnormal battery resistance, affecting the use effect, and further guaranteeing the brand quality and the public praise.
Referring to fig. 5, in the present invention, in S6, the ultrasonic radiographic inspection specifically includes the steps of:
s61: ultrasound ray penetration: scanning and penetrating the welding position of the battery lug after standing by utilizing ultrasonic rays through an ultrasonic ray machine;
s62: image projection: after the ultrasonic rays penetrate through the welding position, the rays with different intensities are projected on the fluorescent screen coated with the fluorescent material to excite the fluorescent light with different intensities, so that the image of the object is obtained;
s63: and (3) shooting, scanning and analyzing: scanning and shooting images on a fluorescent screen in image projection through a camera machine, and observing whether a welding position has a bad state or not through image analysis;
s64: and (5) screening defective products: screening out defective products which do not meet production regulations through shooting scanning analysis, and performing problem analysis to determine repair or elimination;
s65: recording defective product images: the method has the advantages that the method can be used for screening defective products, recording images of the defective products projected on the fluorescent screen, archiving the images, checking the battery in a dual checking mode of analyzing a current diagram and ultrasonic ray detection, comparing the analyzed current diagram with the current diagram through a standard threshold value, detecting the voltage condition of the battery, enabling ultrasonic ray detection to penetrate the battery through ultrasonic rays, analyzing the welding condition through the analyzed images, and further guaranteeing the multi-aspect checking results of the battery through the cooperation of the two, guaranteeing the quality of products, recording images of the defective products projected on the fluorescent screen while screening the defective products, archiving the images, and being capable of being used as a basis and a foundation for problem analysis in the future, facilitating data analysis and improving the production flow better.
Working principle: selecting a lithium iron phosphate battery to be tested, firstly selecting a data threshold value of a qualified battery with the specification under the same voltage, then carrying out flow monitoring on the battery to be tested under the same voltage to obtain a current diagram, carrying out first round of inspection on analysis by comparing the current diagram with the data threshold value of the qualified battery, if the current diagram is within the threshold value range, representing that the welding of the battery tab is perfect, simulating vibration possibly suffered by the battery in the transportation process by damage simulation, if the battery with imperfect welding can generate cracks or even be separated by the damage simulation, and detecting the battery after the damage simulation by X-ray flaw detection after standing, so that the battery with imperfect welding can be further screened, and the quality of the shipment battery is further improved.
The methods disclosed in the several method embodiments provided in the present application may be arbitrarily combined without collision to obtain a new method embodiment.
The foregoing is merely specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily think about changes or substitutions within the technical scope of the present application, and the changes and substitutions are intended to be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (8)
1. A method for detecting battery tab defects, comprising the steps of:
step one, obtaining a current threshold value of a qualified battery;
step two, electrifying a battery to be detected, and obtaining a current diagram of the battery to be detected;
and thirdly, comparing the current diagram of the battery to be detected with a current threshold value of the qualified electromagnetic to obtain an unqualified battery with the defects of the electrode lugs.
2. The method for detecting defects of battery tabs according to claim 1, wherein,
in the first step, the current threshold value for the qualified battery includes a maximum threshold value and a minimum threshold value.
3. The method for detecting defects of battery tabs according to claim 2, wherein,
in the third step, when the highest value of the current diagram of the battery to be detected is higher than the maximum threshold value or the lowest value of the current diagram of the battery to be detected is lower than the minimum threshold value, the electromagnetic failure to be detected is judged, and the risk of poor welding of the battery tab exists.
4. The method for detecting defects of battery tabs according to any one of claims 1 to 3,
the method also comprises the following steps:
step four, simulating amplitude damage to the same battery to be detected;
and fifthly, detecting the battery tab by ultrasonic rays, and observing whether the tab has cracks.
5. The method for detecting battery tab defects as claimed in claim 4, wherein,
and (3) after the simulation amplitude of the battery to be detected is destroyed in the step (IV), standing the battery, and then carrying out the step (V).
6. The method for detecting battery tab defects as claimed in claim 5, wherein,
in the fifth step, C scanning transmission is carried out on the welding position of the battery lug after standing by utilizing ultrasonic rays through an ultrasonic ray machine;
after the ultrasonic rays penetrate through the welding position, rays with different intensities are projected on the fluorescent screen coated with fluorescent substances, and fluorescence with different intensities is excited, so that an image of an object is obtained.
7. The method for detecting battery tab defects as claimed in claim 6, wherein,
further, scanning the image on the fluorescent screen in image projection by a camera machine, and observing whether a bad state exists at the welding position by image analysis;
and screening out unqualified products through shooting, scanning and analyzing.
8. The method for detecting battery tab defects as claimed in claim 4, wherein,
in the fourth step, the following steps:
and sequentially performing first vibration simulation and second vibration simulation on the battery to be detected, wherein the vibration frequency used in the second vibration simulation is increased on the basis of the vibration frequency value in the first vibration simulation, and the vibration time is reduced.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211690070.5A CN116140238A (en) | 2022-12-27 | 2022-12-27 | Method for detecting battery tab defects |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211690070.5A CN116140238A (en) | 2022-12-27 | 2022-12-27 | Method for detecting battery tab defects |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116140238A true CN116140238A (en) | 2023-05-23 |
Family
ID=86351829
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211690070.5A Pending CN116140238A (en) | 2022-12-27 | 2022-12-27 | Method for detecting battery tab defects |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116140238A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116952751A (en) * | 2023-09-20 | 2023-10-27 | 中国汽车技术研究中心有限公司 | Battery pack damage assessment method, system and equipment |
-
2022
- 2022-12-27 CN CN202211690070.5A patent/CN116140238A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116952751A (en) * | 2023-09-20 | 2023-10-27 | 中国汽车技术研究中心有限公司 | Battery pack damage assessment method, system and equipment |
| CN116952751B (en) * | 2023-09-20 | 2023-12-15 | 中国汽车技术研究中心有限公司 | Battery pack damage assessment method, system and equipment |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP2012524385A (en) | Method for operating the battery | |
| CN116140238A (en) | Method for detecting battery tab defects | |
| CN106153732A (en) | Inside lithium ion cell lossless detection method and this cell health state detection method | |
| US11733311B2 (en) | Method of screening high rate electrochemical cells | |
| US6520018B1 (en) | Ultrasonic inspection method for lead-acid battery terminal posts | |
| CN112975215A (en) | Method for characterizing a weld | |
| CN115343623A (en) | Online detection method and device for electrochemical energy storage battery fault | |
| CN105319248A (en) | Electro-chemical nondestructive detection device and method for detecting metal surface defects | |
| CN112162011B (en) | Composite insulator defect detection method, equipment and storage medium | |
| CN110596142A (en) | Terahertz imaging-based defect detection method and system | |
| JP2000269276A (en) | Method and system for analyzing defect | |
| JP2020153750A (en) | Inspection method, inspection device, inspection system, and computer program | |
| CN116297835A (en) | Ultrasonic detection device and method for detecting cable aging | |
| CN114415071A (en) | Method for detecting poor welding of lithium iron phosphate battery tab | |
| JP2001135363A (en) | Equipment for checking leak of electrolyte solution in battery, and method for checking the same | |
| JPS62114786A (en) | Method for monitoring processing condition | |
| JPH0634564A (en) | Weld part inspection method of steel plate | |
| JPH06333605A (en) | Battery characteristic evaluating device and evaluating method | |
| CN113204868B (en) | Defect detection parameter optimization method and optimization system based on POD quantitative analysis | |
| JP2007232478A (en) | Method for checking coupling of ultrasonic probe and computer program | |
| CN220525686U (en) | X-ray nondestructive testing optical imaging system and testing equipment | |
| Saxena et al. | X-ray based non-destructive method for alkaline coin cell quality assurance | |
| CN106996959B (en) | A method of detection high-voltage fence strain clamp presses situation | |
| McGovern et al. | Pulsed infrared thermography for assessment of ultrasonic welds | |
| JP2024504928A (en) | Foreign object position detection device for low voltage battery cells and analysis method using the same |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| TA01 | Transfer of patent application right | ||
| TA01 | Transfer of patent application right |
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 |