Lithium Electrode Sheet Traceability via Segmentation and Laser Marking
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Solution Overview
Problem
Current production processes for lithium electrode sheets in lithium batteries lack refined marking and quality tracing, leading to difficulties in identifying specific defective sheets within a roll, resulting in scrapping of entire rolls with both good and bad sheets, and increased production costs.
Innovation Solution
A quality tracing system and method that physically segments electrode sheets, incorporates a manufacturing execution system (MES), and uses laser marking, CCD dimensional measurement, and weight measurement to accurately distinguish good and defective products, enhancing quality traceability and yield statistics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If physical segmentation and individual marking of electrode sheets are implemented, then quality traceability and identification precision are improved, but device complexity and production process complexity increase
Solution Approach 1:
The patent divides a continuous roll of electrode sheets into individual segmented units by performing physical cutting at specific intervals and applying unique marking codes to each segment. This segmentation enables individual quality tracking of each electrode sheet while maintaining the benefits of continuous production, resolving the contradiction between quality traceability and process complexity through systematic division of the production flow.
Solution Approach 2:
The patent implements marking and segmentation operations during the production process itself, rather than as post-production steps. By preliminarily marking electrode sheets with unique identifiers and quality data while they are being manufactured, the system establishes quality traceability at the source, reducing the need for complex downstream tracking systems.
2Productivity
If entire rolls are inspected and processed as single units, then production efficiency is maintained, but quality identification accuracy deteriorates causing good products to be scrapped
Solution Approach 1:
The patent segments the electrode sheet roll into individually identifiable units with unique marking codes, enabling quality issues to be localized to specific segments rather than requiring disposal of entire rolls. This maintains production efficiency by allowing unaffected segments to continue through the process while improving quality identification accuracy through precise defect localization.
Solution Approach 2:
The patent applies quality management principles at the local segment level rather than treating the entire roll uniformly. Each segmented electrode sheet receives individual quality assessment and marking, allowing localized quality control decisions that preserve good segments while isolating defective ones, thereby maintaining overall production efficiency while improving quality precision.
3Speed
If multiple coating passes are performed simultaneously on electrode sheets, then production speed is improved, but measurement data completeness deteriorates due to area data gaps
Solution Approach 1:
The patent implements a feedback mechanism where measurement data from multiple simultaneous coating passes is collected, correlated, and integrated for each marked electrode sheet segment. The system tracks and reconciles data from different coating lines, ensuring complete measurement coverage by using the marking system to associate and merge data streams, thereby maintaining high production speed while eliminating data gaps through systematic data integration.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables precise identification and differentiation of good and defective electrode sheets, preventing defective products from contaminating subsequent procedures and reducing waste, while improving the accuracy and convenience of quality tracing.
Implementation Method 1
a laser marking mechanism (3), and a winding mechanism (7)
Implementation Method 2
an electrode sheet weight measurement device (6)
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
The present application relates to the field of quality tracing technology and discloses a quality tracing system and method for lithium electrode sheets. The system includes: an electrode sheet segmentation unit, a coating unit, an electrode sheet measurement unit and a control unit, wherein the electrode sheet segmentation unit is configured to perform physical segmentation on lithium electrode sheets to be processed; the coating unit is configured to identify and coat the lithium electrode sheets which have been subjected to the physical segmentation; the electrode sheet measurement unit is configured to measure the coated lithium electrode sheet; and the control unit is configured to control the electrode sheet segmentation unit, the coating unit and the electrode sheet measurement unit to operate, collect data generated during a physical segmentation process, a coating process and a measurement process of the electrode sheets and store the data, and perform quality tracing on the lithium electrode sheets according to the stored data. In the present application, good products and defective products of lithium electrode sheets can be accurately distinguished, thereby avoiding the phenomenon in which the defective products of the lithium electrode sheets flow to subsequent procedures and the good products are overly filtered out and scrapped, and making the statistics on the yield of the lithium electrode sheets more accurate, and the quality tracing of the lithium electrode sheets more convenient and comprehensive.