Composite Electrode Strip Edge Detection for Accurate Division Marking
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Solution Overview
Problem
Existing methods are inadequate for accurately marking and detecting defects in the electrode sheets of continuous composite strips during the production of lithium batteries, particularly in the stacking process, which is different from the winding process, and cannot distinguish the electrode sheets of a continuous stack composite strip including a continuous anode combined with cathodes.
Innovation Solution
A method involving image identification technology to identify electrode sheet edges in a continuous composite strip by splicing multiple images, determining electrode sheet division positions, and performing accurate sheet division marking, including abnormality detection and cell division based on image features and encoder signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional marking methods (inkjet printing, pad printing, laser marking) are used on continuous composite material belts, then marking can be applied to the material, but the material must be stopped and unloaded from rollers, which reduces productivity and increases processing time
Solution Approach 1:
The patent replaces traditional mechanical marking methods (inkjet printing, pad printing, laser marking) that require stopping the material with a non-contact electrohydrodynamic (EHD) marking system. The EHD marker uses a high-voltage electrode to ionize air and create an ionic wind that propels marking particles onto the moving composite material belt without physical contact, allowing continuous marking at production speed without stopping or unloading the material.
2Manufacturing precision
If the continuous composite material belt is stopped for marking, then accurate marking can be achieved, but production efficiency decreases and processing time increases
Solution Approach 1:
The system performs preliminary positioning and alignment of the high-voltage electrode relative to the material belt before marking begins. The electrode is positioned to mark at a predetermined location on the belt, and the system is calibrated while the material is stationary or at low speed. Once positioned, the marking continues automatically at full production speed without stopping, as the electrode tracks or the belt moves continuously under the fixed electrode.
Solution Approach 2:
The patent replaces mechanical stopping and positioning mechanisms with a non-contact EHD marking system that can mark moving material. The electrohydrodynamic force allows particles to be deposited on the moving belt surface without physical contact or interruption of material flow, eliminating the need to stop production for marking operations.
3Ease of manufacture
If conventional marking equipment is used, then marking function is provided, but the equipment complexity increases and requires additional rollers and unloading mechanisms
Solution Approach 1:
The patent extracts the marking function from complex mechanical systems (rollers, unloading mechanisms, multiple marking heads) and implements it through a single high-voltage electrode that generates electrohydrodynamic forces. This simplified configuration eliminates the need for additional rollers, unloading mechanisms, and complex positioning systems required by conventional marking equipment.
Solution Approach 2:
The high-voltage electrode serves multiple functions: it generates the electrohydrodynamic force to propel particles, positions the marking location through voltage control, and can mark different materials by adjusting particle composition. This single component replaces multiple specialized components required by traditional marking systems, simplifying the overall equipment structure.
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 marking of electrode sheet positions, enhances defect detection, and ensures the quality and integrity of lithium battery production by accurately distinguishing electrode sheets and cells in the continuous composite strip.
Implementation Method 1
a non-contact electrohydrodynamic (EHD) marker that uses a high-voltage electrode to ionize air and create an ionic wind that propels marking particles onto the moving composite material belt
Implementation Method 2
uses a high-voltage electrode to ionize air and create an ionic wind
Data Source
Figure 1~3a
Figure 3b~4
Figure 5
AI summary
The disclosure discloses a marking method and apparatus of a continuous composite strip. The method incudes: collecting a first sequence of images of the continuous composite strip; splicing multiple images of the first sequence of images according to a collection sequence, to obtain a to-be-detected image with at least one electrode sheet structure; and marking, in case where two electrode sheet edges are identified in the to-be-detected image, a position of the collection-sequentially second electrode sheet edge in the continuous composite strip as an electrode sheet division position of the continuous composite strip. The method determines the electrode sheet division position by identifying the electrode sheet edges in the continuous composite strip, obtains the specific position information of the electrode sheet, and accurately performs the sheet division marking of the continuous composite strip.