Method for rapidly detecting and screening metal foreign matters in battery production process and management and control system
By constructing a closed-loop control system on the lithium-ion battery production line, and utilizing foreign object collection devices and efficient analysis technology, rapid detection and traceability of metallic foreign objects have been achieved. This solves the problems of high detection costs and difficulty in traceability in existing technologies, and improves production safety and consistency.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- TIANJIN JUYUAN NEW ENERGY TECH CO LTD
- Filing Date
- 2025-12-09
- Publication Date
- 2026-04-10
AI Technical Summary
In existing technologies, it is difficult to quickly and accurately detect and trace metallic foreign objects during the lithium-ion battery production process, which leads to safety hazards in the production process, high detection costs, and an inability to effectively prevent batch quality accidents.
A closed-loop control system is constructed by deploying foreign matter collection devices at key points on the production line. Combined with X-ray fluorescence spectroscopy and laser-induced breakdown spectroscopy, the collected samples are subjected to rapid elemental analysis and morphological observation to achieve accurate characterization of metallic foreign matter and to perform correlation analysis to locate the source of pollution.
It enables near real-time monitoring and rapid traceability of metallic foreign objects, reducing detection costs and time, improving production safety and consistency, and preventing batch quality accidents.
Smart Images
Figure CN121820187A_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The application belongs to the technical field of lithium ion batteries, and particularly relates to a battery production process metal foreign matter rapid detection screening method and a management and control system. BACKGROUND
[0002] With the rapid development of consumer electronics, electric vehicles and large-scale energy storage, the market has put forward higher requirements for the energy density, charging speed, cycle life, safety and reliability of lithium ion batteries. The continuous evolution of battery structure and manufacturing process not only improves performance, but also faces severe safety challenges in the production process. Among them, the introduction of metal foreign matters (such as iron, copper, nickel, aluminum, stainless steel particles) in the production process is one of the main risk sources leading to internal short circuit, thermal runaway and even fire and explosion of the battery. These foreign matters have a wide range of sources and can penetrate many links such as raw materials, equipment wear, personnel operation and environmental dust.
[0003] At present, the industry mainly relies on incoming inspection of raw materials and X-ray detection of finished batteries for the management and control of metal foreign matters. This method has the following obvious defects: finished product X-ray detection is a post-inspection, and once foreign matters are found, it usually means that the entire batch of products has quality risks, resulting in high scrap costs; it is difficult to quickly locate the specific process and equipment of the pollution source after the problem is found, the investigation period is long, and the production continuity and efficiency are affected; it relies on large-scale finished product full inspection or external third-party laboratory analysis, which is high in time and economic cost, and requires additional manpower; X-ray has limited detection capability for non-metallic foreign matters and some low atomic number metals, and cannot provide foreign matter element composition information, which is not conducive to accurate tracing. SUMMARY
[0004] The purpose of the present application is to provide a battery production process metal foreign matter rapid detection screening method and a management and control system to solve the technical problems existing in the prior art.
[0005] To achieve the above-mentioned purpose, the present application provides the following technical scheme: a battery production process metal foreign matter rapid detection screening method, the method comprising the following steps: S1, key point identification and system control: identifying key points in the battery production process that are prone to introduce metal foreign matters, and systemically arranging foreign matter collection devices at the key points to form a monitoring network; S2, rapid collection and sampling: periodically recovering the foreign matter samples collected by the foreign matter collection devices, and identifying the samples; S3, rapid detection and correlation analysis: sequentially performing rapid element analysis, high-resolution morphology observation and element analysis on the samples, obtaining element composition information and microscopic morphology information of the foreign matters, and performing correlation analysis combined with the sampling point information; S4, fast feedback and source control: according to the results of the correlation analysis, the source of pollution is located and judged, and the control measures are implemented.
[0006] Preferably, in step S1, the foreign matter collecting device comprises a magnetic device for collecting ferromagnetic metal particles and an adhesion device for collecting non-ferromagnetic particles.
[0007] Preferably, the magnetic device comprises a portable magnetic rod and / or a ground mobile magnetic vehicle; the core magnet of the portable magnetic rod and the ground mobile magnetic vehicle adopts a permanent magnet with a surface magnetic field strength not less than 10000Gs.
[0008] Preferably, the permanent magnet is a neodymium-iron-boron N52 grade permanent magnet or a sintered samarium-cobalt permanent magnet.
[0009] Preferably, in step S3, the fast element analysis is performed by X-ray fluorescence spectrometry.
[0010] Preferably, in step S3, the high-resolution topography observation and element analysis are performed by a device integrated with an optical observation system and a laser-induced breakdown spectroscopy analysis system to synchronously obtain the micro-topography and element composition information of the foreign matter.
[0011] Preferably, the specific process of step S3 is: first, using an X-ray fluorescence spectrometer to perform fast and non-destructive element composition analysis on the sample, and screening out abnormal particles; then, using a device integrated with an optical observation system and a laser-induced breakdown spectroscopy analysis system to perform high-resolution topography observation and element analysis under precise positioning on the abnormal particles.
[0012] The application also discloses a battery production process metal foreign matter fast detection screening and control system for implementing the method, and the system comprises: A foreign matter collecting module comprising at least one foreign matter collecting device arranged at a key point of a production line, for collecting foreign matter particles in a production environment; A fast detection and analysis module comprising a first analysis device for performing fast element analysis on the collected foreign matter sample, and a second analysis device for performing high-resolution topography observation and precise positioning element analysis on the foreign matter sample; A data processing and feedback module for correlating and analyzing the sampling point information from the foreign matter collecting module, and the element composition information and micro-topography information from the fast detection and analysis module, to generate a pollution source judgment result and a control instruction.
[0013] Preferably, the foreign matter collecting device in the foreign matter collecting module comprises a portable magnetic rod, a ground mobile magnetic vehicle and a dust sticking pad.
[0014] Preferably, the first analysis device is an X-ray fluorescence spectrometer, and the second analysis device is a device integrated with a super-depth-of-field three-dimensional optical microscope and a laser-induced breakdown spectroscopy analysis system.
[0015] The present application has the advantages that: the present application moves the control point of metal foreign matter control from "post-inspection" to "process prevention" by constructing a "collection-detection-analysis-feedback" closed-loop management and control system, realizes near-real-time monitoring and rapid tracing, the system can complete the whole process from on-site sampling to issuing element composition and morphology analysis results within 1 hour, greatly improves the response speed, at the same time, low-cost collection devices and on-site rapid analysis equipment are used, which significantly reduces the detection cost and time, through comprehensive use of X-ray fluorescence spectroscopy, laser-induced breakdown spectroscopy and morphology analysis technology, accurate and comprehensive characterization of foreign matter is realized, so that the pollution source can be effectively located and timely intervention is guided, and finally the consistency and safety of battery production are systematically improved, and batch quality accidents are avoided. BRIEF DESCRIPTION OF DRAWINGS
[0016] Figure 1 is a structural schematic diagram of the ground magnetic vehicle used in the present application.
[0017] Figure 2 is a structural schematic diagram of the portable magnetic rod used in the present application.
[0018] Figure 3 is a schematic diagram of the test of the super-depth-of-field three-dimensional microscope and the laser-induced breakdown spectroscopy module in the present application.
[0019] Figure 4 is a schematic diagram of the test of the X-ray fluorescence tester in the present application.
[0020] Figure 5 is a work flow diagram of the closed-loop management and control system of the present application.
[0021] Figure 6 is an example diagram of the element test spectrum output by the two test devices in the present application, which specifically shows the VHX element test spectrum and the iEDX element test spectrum.
[0022] Explanation of reference numerals in the drawings: 1: magnetic vehicle; 2: portable magnetic rod; 3: super-depth-of-field three-dimensional microscope and element discrimination module; 4: laser targeting test area; 5: energy dispersive X-ray fluorescence excitation and detection module of the X-ray fluorescence tester; 6: X-ray fluorescence emission test area; 7: closed-loop management and control flow chart; 8: VHX element test spectrum; 9: iEDX element test spectrum. DETAILED DESCRIPTION
[0023] The specific embodiments of the present invention will now be described in detail with reference to the accompanying drawings and preferred embodiments.
[0024] The rapid detection, screening, and control system for metallic foreign objects in the battery production process provided by this invention is a closed-loop management system integrating specific hardware devices, analytical technologies, and standardized processes. For example... Figure 5 As shown, its core is to construct a closed-loop process of "collection, detection, analysis, feedback, and control" to achieve near real-time monitoring and proactive prevention of metal foreign object contamination.
[0025] The system mainly includes the following core components: Foreign object rapid collection device: used to actively capture foreign objects on the production site.
[0026] Ground magnetic vehicle 1: such as Figure 1 As shown, the device is equipped with a high-strength permanent magnet plate at the bottom, which can roll on the workshop floor to attract scattered ferromagnetic particles.
[0027] Portable magnetic rod 2: such as Figure 2 As shown, the core of the magnetic rod is made of neodymium iron boron N52 grade or sintered samarium cobalt permanent magnet with a surface magnetic field strength ≥10000Gs. The outside can be covered with a disposable protective film for precise adsorption at key points such as the surface of equipment.
[0028] Adhesive mats: Placed at the entrances and exits of clean areas to adhere to non-ferromagnetic particles.
[0029] Foreign matter rapid detection and analysis device: used for rapid on-site characterization of collected samples.
[0030] X-ray fluorescence analyzer 5: such as Figure 4 As shown, the device includes an energy-dispersive X-ray fluorescence excitation and detection module, enabling rapid and non-destructive elemental composition analysis of samples. During testing, the sample is located in the X-ray fluorescence emission testing area.
[0031] Super depth-of-field 3D microscope and element discrimination module 3: such as Figure 3 As shown, this device integrates a high-resolution optical system and a laser-induced breakdown spectroscopy analysis system. It can perform high-resolution morphological observation of samples and accurately locate and analyze micron-sized single particles using a laser-targeted testing area.
[0032] The following combination Figure 5 The closed-loop control flowchart shown below details the implementation steps of this system: S1: Key Point Control and Foreign Object Collection Firstly, based on FMEA and other methods, identify the key points on the production line (such as mixing, coating, rolling, cutting, lamination / winding, etc.). At these points, systemically arrange the magnetic car 1, magnetic bar 2 and dust sticking pad. For example, arrange the magnetic bar 2 near the rolling machine, and plan the magnetic car 1 inspection route on the main road.
[0033] S2: Rapid collection and sampling According to the specified frequency, recover the magnetic foreign matter adsorbed on the magnetic bar 2 and the magnetic car 1, and replace the dust sticking pad. All samples need to be clearly labeled with collection point, time and equipment information.
[0034] S3: Rapid detection and correlation analysis Send the sample to the on-site analysis area and perform detection in sequence: Firstly, use the X-ray fluorescence tester 5 to perform rapid screening on the sample, obtain the preliminary element composition spectrum, and realize rapid classification and quantification of foreign matter.
[0035] Subsequently, for typical particles that need further analysis, use the ultra-deep three-dimensional microscope and element discrimination module 3 to perform high-magnification morphology observation, and use the LIBS function to perform accurate element analysis on a specific micro area, and obtain more detailed element spectrum.
[0036] Finally, correlate the element data, morphology information and sampling point information from different equipment, and comprehensively judge the type and characteristics of the foreign matter.
[0037] S4: Rapid feedback and source control According to the correlation analysis results, quickly deduce the pollution source (for example, wear debris containing Fe, Cr and Ni may come from stainless steel parts). Then issue a warning to the corresponding process, guide the equipment maintenance, process optimization or cleaning and rectification, so as to block the pollution from the source and form a closed-loop control.
[0038] Through the above implementation, the present application moves the metal foreign matter detection from the "after-the-fact inspection" of finished products to real-time monitoring of the process. Using low-cost devices such as magnetic car 1, magnetic bar 2 and on-site rapid analysis equipment, the whole process from sampling to issuing analysis results can be completed within 1 hour, realizing rapid response. Through accurate element and morphology correlation analysis, the pollution source can be effectively located, making preventive intervention possible, thereby significantly reducing the quality risk of batteries caused by metal foreign matter.
[0039] For those skilled in the art, without departing from the principles of the present application, a number of improvements and refinements can be made, which should also be considered within the scope of protection of the present application.
Claims
1. A rapid detection and screening method for metallic foreign objects in the battery manufacturing process, characterized in that, The method includes the following steps: S1. Key Point Identification and System Control: Identify key points in the battery production process that are prone to introducing metallic foreign objects, and systematically deploy foreign object collection devices at the key points to form a monitoring network. S2. Rapid collection and sampling: Periodically collect foreign object samples collected by the foreign object collection device and label the samples; S3. Rapid detection and correlation analysis: The sample is subjected to rapid elemental analysis and high-resolution morphology observation and elemental analysis in sequence to obtain the elemental composition information and micromorphological information of the foreign matter, and correlation analysis is performed in combination with the sampling point information. S4. Rapid Feedback and Source Control: Based on the results of the correlation analysis, locate and determine the source of pollution, and implement targeted control measures.
2. The rapid detection and screening method for metallic foreign objects in the battery production process according to claim 1, characterized in that, In step S1, the foreign object collection device includes a magnetic device for collecting ferromagnetic metal particles and an adhesive device for collecting non-ferromagnetic particles.
3. The rapid detection and screening method for metallic foreign objects in the battery production process according to claim 2, characterized in that, The magnetic device includes a portable magnetic rod and / or a ground-mobile magnetic vehicle; the core magnet of the portable magnetic rod and the ground-mobile magnetic vehicle is a permanent magnet with a surface magnetic field strength of not less than 10,000 Gs.
4. The rapid detection and screening method for metallic foreign objects in the battery production process according to claim 3, characterized in that, The permanent magnet is a neodymium iron boron N52 grade permanent magnet or a sintered samarium cobalt permanent magnet.
5. The rapid detection and screening method for metallic foreign objects in the battery production process according to claim 1, characterized in that, In step S3, the rapid elemental analysis is performed using X-ray fluorescence spectroscopy.
6. The rapid detection and screening method for metallic foreign objects in the battery production process according to claim 1 or 5, characterized in that, In step S3, the high-resolution morphology observation and elemental analysis are performed using a device that integrates an optical observation system and a laser-induced breakdown spectroscopy analysis system, so as to simultaneously acquire the microscopic morphology and elemental composition information of the foreign object.
7. The rapid detection and screening method for metallic foreign objects in the battery production process according to claim 1, characterized in that, The specific process of step S3 is as follows: First, use an X-ray fluorescence spectrometer to perform rapid and non-destructive elemental composition analysis on the sample to screen out abnormal particles; then, use a device that integrates an optical observation system and a laser-induced breakdown spectroscopy analysis system to perform high-resolution morphological observation and elemental analysis under precise positioning on the abnormal particles.
8. A rapid detection, screening, and control system for metallic foreign objects in a battery production process for implementing the method described in any one of claims 1-7, characterized in that, The system includes: A foreign matter collection module includes at least one foreign matter collection device deployed at key points on the production line for collecting foreign matter particles in the production environment. The rapid detection and analysis module includes a first analytical device for rapid elemental analysis of collected foreign matter samples, and a second analytical device for high-resolution morphological observation and precise elemental analysis of foreign matter samples. The data processing and feedback module is used to correlate and analyze the sampling point information from the foreign matter collection module, as well as the elemental composition information and microscopic morphology information from the rapid detection and analysis module, to generate pollution source determination results and control instructions.
9. The control system according to claim 10, characterized in that, The foreign object collection module includes a portable magnetic rod, a ground-mobile magnetic vehicle, and a dust-adhesive mat.
10. The control system according to claim 10, characterized in that, The first analytical device is an X-ray fluorescence spectrometer, and the second analytical device is a device that integrates a super depth-of-field three-dimensional optical microscope and a laser-induced breakdown spectroscopy analysis system.