Electrode Roll Mapping for Cell-Level Defect Traceability
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Solution Overview
Problem
Existing electrode manufacturing processes lack the ability to track the position of electrodes in units of battery cells prior to the notching process, leading to inefficiencies in quality tracking and the need to discard entire electrode rolls when defects are detected.
Innovation Solution
A system is developed to track electrode positions using roll map information, incorporating a notching controller, calculator, roll map generator, and mapping part to determine electrode coordinates and derive positions from which unit electrodes originate, enabling quality tracking in units of battery cells throughout the electrode manufacturing process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If quality tracking is implemented in units of battery cells after the notching process, then defect analysis capability is improved, but the ability to track electrode positions in the electrode manufacturing process prior to notching remains lost
Solution Approach 1:
The system performs preliminary actions by marking the electrode with position information and generating roll map data before the notching process occurs. This allows the electrode position to be tracked through subsequent processes including notching, enabling defect analysis to trace back to the exact location in the electrode manufacturing process where the defect originated.
Solution Approach 2:
The system creates a virtual copy of the electrode's position information through roll map data that simulates the electrode's progress through the manufacturing process. This virtual copy allows tracking and analysis without physically marking or altering the electrode itself, preserving the electrode while enabling precise position tracking.
2Reliability
If the entire electrode roll is discarded when a defect is detected, then product quality is improved, but material waste increases
Solution Approach 1:
The system segments the electrode roll into individually trackable units by recording position information for each electrode or section. When a defect is detected, the system can identify the specific segment containing the defect and isolate only that portion for discarding, while preserving the remaining defect-free segments of the electrode roll.
Solution Approach 2:
The system implements feedback by continuously tracking electrode position information through the manufacturing process and providing real-time data about electrode locations. This feedback loop enables precise identification of defective sections, allowing the system to respond by discarding only the specific defective segment rather than the entire roll.
3Measurement precision
If electrode position tracking is implemented throughout the electrode manufacturing process, then quality tracking precision is improved, but system complexity increases
Solution Approach 1:
The roll map generator serves multiple functions: it tracks electrode position, simulates electrode progress through the manufacturing process, stores position information, and generates data for defect analysis. This multi-functional approach consolidates what could be multiple separate systems into a single versatile component, reducing overall system complexity while maintaining high tracking precision.
Data Source
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Figure 5(a)~5(b)
AI summary
A system for tracking a position of an electrode, which includes a notching controller configured to store pitch information representing a width of a unit electrode subjected to notching and to acquire electrode coordinate information of the electrode in a roll-to-roll state during a notching process and a cell identification (ID) of the unit electrode; a calculator configured to calculate coordinates of the cell ID from the pitch information and the cell ID acquired by the notching controller, wherein the coordinates of the cell ID represent a position of the unit electrode during the notching process; a roll map generator configured to generate a roll map based on the electrode coordinate information transmitted from the notching controller, wherein the roll map includes coordinates of the roll map based on a dimension in a length direction of the electrode to determine a change in an electrode length during an electrode manufacturing process prior to the notching process; and a mapping part configured to compare the coordinates of the roll map with the coordinates of the cell ID to derive an electrode position of the electrode during the electrode manufacturing process from which the unit electrode originates.