Electrode Roll Map Generation Using Single-Reader Datum Tracking
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Solution Overview
Problem
The existing methods for generating roll maps in secondary battery manufacturing are costly and inefficient, leading to high capital expenditure.
Innovation Solution
A method for generating roll maps by forming datum points on uncoated parts of electrode sheets, collecting and calculating coordinate data, and generating roll maps for individualized electrode rolls, reducing the need for multiple optical character readers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple optical character readers are deployed to collect datum point data from all uncoated parts, then measurement completeness is improved, but system cost and device complexity increase
Solution Approach 1:
The electrode sheet is divided into multiple uncoated parts (first uncoated part, second uncoated part, etc.), and datum points are formed on each segment. This segmentation allows the system to process and track different sections independently, enabling complete measurement coverage through a single optical character reader by sequentially reading datum points from different segments as they pass through the sensing position.
Solution Approach 2:
Datum points are formed on the uncoated parts during the coating process before the electrode sheet reaches the sensing position. This preliminary action ensures that all necessary measurement markers are already in place, allowing a single optical character reader to collect all datum point data without requiring multiple readers deployed at different locations.
2Device complexity
If a single optical character reader is used to sense datum points, then capital expenditure is reduced, but the ability to simultaneously track multiple coated lanes is limited
Solution Approach 1:
The system uses the temporal dimension (sequence of events) to resolve the limitation of a single sensor. Datum points from different coated lanes are read sequentially in time as the electrode sheet moves through the sensing position, rather than requiring spatial parallelism. The coordinate calculation unit processes these sequential readings along with offset data to reconstruct the positions of all datum points across multiple lanes, effectively using time-based multiplexing to achieve multi-lane tracking capability with a single reader.
Solution Approach 2:
The coordinate calculation unit acts as an intermediary that processes the sequential datum point data from the single optical character reader and combines it with offset data to calculate the coordinates of all datum points. This intermediary computation layer enables the system to infer information about multiple coated lanes from readings taken at a single location, effectively using data processing as a mediator to overcome the physical limitation of having only one sensor.
3Loss of information
If datum points are formed on all uncoated parts, then traceability of all coated lanes is improved, but process complexity increases
Solution Approach 1:
The electrode sheet is divided into multiple uncoated parts (first uncoated part, second uncoated part, etc.), and datum points are formed on each segment. This segmentation allows the system to process and track different sections independently, enabling complete measurement coverage through a single optical character reader by sequentially reading datum points from different segments as they pass through the sensing position.
Solution Approach 2:
The coordinate calculation unit acts as an intermediary that processes the sequential datum point data from the single optical character reader and combines it with offset data to calculate the coordinates of all datum points. This intermediary computation layer enables the system to infer information about multiple coated lanes from readings taken at a single location, effectively using data processing as a mediator to overcome the physical limitation of having only one sensor.
Data Source
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AI summary
A method for generating a roll map includes: coating, with electrode slurry, a first electrode sheet unwound from a first electrode roll so as to form, thereon, a first coated part lane, a second coated part lane, a first uncoated part, and a second uncoated part; forming a first reference point on the first uncoated part and forming a second reference point on the second uncoated part; winding the first electrode sheet into a second electrode roll; detecting the first reference point of the second electrode sheet unwound from the second electrode roll so as to collect first reference point data that indicate coordinates of the first reference point in the second electrode sheet; and generating, on the basis of the first reference point data, second reference point data that indicate coordinates of the second reference point in the second electrode sheet.