Electrode Sheet Defect Marking with Heated Ink Adhesion
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Solution Overview
Problem
Existing methods for manufacturing secondary batteries face challenges in identifying and addressing defects in electrode sheets, such as pinholes and streaks, which can lead to battery defects if not detected early.
Innovation Solution
A marking system that includes a vision sensor to detect defects, a heater to heat the non-coating portion, a marker to apply ink on the defects, and a blower to dry the ink quickly, allowing for easy identification and removal of defective areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a vision sensor detects defects and marks them with ink, then defect identification capability is improved, but the ink may transfer or erase during subsequent processing
Solution Approach 1:
The heater is positioned to heat the non-coating portion of the electrode collector before the marker applies ink to the defect. This preliminary heating action prepares the surface by removing moisture and creating a more stable substrate for ink adhesion, preventing subsequent ink transfer or erasure during battery assembly processing.
Solution Approach 2:
The system changes the temperature parameter of the non-coating portion by applying heat before marking. This parameter change (from ambient temperature to heated state) modifies the surface properties of the electrode collector, enabling better ink fixation and preventing the mark stability issues that would occur at lower temperatures.
2Area of stationary object
If the electrode active material is applied to the entire width of the electrode collector, then coating coverage is improved, but coating uniformity and drying efficiency deteriorate due to excessive material application
Solution Approach 1:
The system applies electrode active material selectively to specific regions rather than uniformly across the entire electrode collector width. The coating device is positioned to coat only the central portion where defects are most likely to occur, leaving the edge portions uncoated. This local quality approach maintains coating uniformity in the coated region while improving overall drying efficiency and reducing material waste.
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
The system effectively marks and dries ink on defects, improving battery quality by enabling early identification and removal of defective electrode sheet portions, enhancing energy efficiency and preventing ink transfer or erasure during processing.
Implementation Method 1
a heater disposed behind the vision sensor in a moving direction of the electrode sheet, the heater being configured to heat the non-coating portion when the defects are detected by the vision sensor
Implementation Method 2
a blower disposed behind the marker in the moving direction of the electrode sheet to dry the ink on the area
Data Source
AI summary
A marking system is provided for identifying defects of an electrode sheet including that includes an active material layer coated with an electrode active material and a non-coating portion disposed at one side in a width direction of the active material layer. The marking system for identifying the defects of the electrode sheet may include: a vision sensor configured to detect the defects of the electrode sheet; a heater disposed behind the vision sensor in a moving direction of the electrode sheet, the heater being configured to heat the non-coating portion when the defects are detected by the vision sensor; a marker configured to mark ink on an area corresponding to each defect on the non-coating portion heated by the heater; and a blower disposed behind the marker in the moving direction of the electrode sheet to dry the ink on the area.