Electrode Color Measurement for Pre-Roll Defect Screening
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Solution Overview
Problem
Existing methods cannot evaluate electrode quality in real time before roll-pressing, leading to the inability to filter out defective electrodes until after the process, which increases defect rates in finished products.
Innovation Solution
Evaluating electrode quality by measuring the color coordinate value of electrodes before roll-pressing using an optical instrument, comparing the measured values to predetermined criteria, and classifying electrodes as good or defective based on these values.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If adhesion evaluation is performed after roll-pressing, then accurate quality assessment is achieved, but real-time quality control and defect filtering before roll-pressing become impossible
Solution Approach 1:
The invention performs quality evaluation actions before roll-pressing by measuring color coordinate values of the active material layer on the electrode. This preliminary measurement allows defective electrodes to be identified and filtered out before they undergo roll-pressing, preventing defects from propagating to the final product while maintaining production efficiency.
Solution Approach 2:
The invention replaces the mechanical roll-pressing process with an optical measurement system. Instead of requiring electrodes to undergo roll-pressing before quality assessment, an optical instrument measures color coordinate values non-contactly and non-destructively, enabling real-time quality control without mechanical intervention.
2Difficulty of detecting and measuring
If complex quality inspection methods are used to evaluate electrode properties before roll-pressing, then defect detection capability is improved, but process complexity and measurement difficulty increase
Solution Approach 1:
The invention replaces complex mechanical testing equipment with a simple optical measurement system. By measuring color coordinate values using an optical instrument, the system achieves effective defect detection without requiring complex mechanical test setups, reducing both device complexity and measurement difficulty.
Solution Approach 2:
The invention utilizes color coordinate value changes as an indicator of electrode quality. Different adhesion qualities correspond to different color characteristics of the active material layer, allowing defects to be detected through simple color measurement rather than complex mechanical testing.
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
This method allows for the quick identification and removal of defective electrodes before roll-pressing, significantly reducing defect rates in finished products by predicting adhesion properties post-pressing.
Implementation Method 1
measuring a color coordinate value of the active material layer using an optical instrument
Data Source
AI summary
Provided is a method of evaluating electrode quality capable of simply and quickly filtering out defective electrodes by measuring a color coordinate value of electrodes before roll-pressing, which specifically includes: providing an electrode which includes a current collector and an active material layer formed on the current collector and has not been roll-pressed; measuring a color coordinate value of the active material layer using an optical instrument; and evaluating the electrode as a good product when the measured color coordinate value satisfies a predetermined electrode quality evaluation criterion and as defective when the measured color coordinate value does not satisfy the predetermined electrode quality evaluation criterion.