Dry Electrode Film Resistance Inspection Without Contact Damage
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Solution Overview
Problem
The manufacturing of electrodes for secondary batteries using a dry process faces challenges in measuring the dispersibility of materials due to the absence of solvents, which can lead to reduced accuracy in quality control and increased production costs.
Innovation Solution
A method and apparatus for inspecting dry electrodes using a resistance sensor that contactlessly measures electrical resistance values, including a feeder, trimmer, and tension controller to manage film movement and edge removal, allowing for comprehensive and non-destructive evaluation of electrode films.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If a dry process is used to manufacture electrodes without solvents, then production cost and time are reduced, but the dispersibility of materials on the film is reduced making measurement difficult
Solution Approach 1:
The patent replaces contact-based mechanical measurement systems with a non-contact resistance measurement system using electromagnetic fields. The resistance sensor applies a magnetic field to an induction coil to form an electric field that penetrates the electrode film, allowing measurement of electrical resistance without physical contact. This enables accurate measurement of material dispersibility in dry electrodes while maintaining the benefits of the solvent-free dry process.
Solution Approach 2:
The patent changes the measurement parameter from direct physical contact properties to electrical resistance properties. By measuring electrical resistance values that reflect material dispersibility, the system can accurately assess quality in dry electrodes where traditional contact-based methods fail. The resistance sensor detects changes in electrical properties caused by the electrode structure, providing a new parameter space for quality measurement.
2Measurement precision
If contact-based measurement methods are used on dry electrode films, then measurement can be performed, but the films may be damaged
Solution Approach 1:
The patent replaces contact-based mechanical measurement with non-contact electromagnetic measurement. The resistance sensor uses an induction coil to generate a magnetic field that induces an electric field penetrating the electrode film without physical contact. This eliminates mechanical stress and damage to the delicate dry electrode film while maintaining measurement capability through detection of electrical resistance changes.
3Loss of substance
If edge portions of the electrode film are not removed, then material is saved, but measurement accuracy is reduced due to edge effects
Solution Approach 1:
The patent applies local quality by selectively removing only the edge portions of the electrode film that cause measurement interference, while preserving the majority of the material. The trimmer removes a predetermined width from the edges where irregularities affect measurement, allowing accurate resistance measurement of the central region without excessive material waste. This localized treatment optimizes both material utilization and measurement accuracy.
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 accurate and efficient detection of defects in dry electrode films, reducing production costs and improving quality control by identifying small differences in electrical resistance values without damaging the films.
Implementation Method 1
The resistance sensor may be configured to form an electric field in a direction perpendicular to or substantially perpendicular to the dry electrode film by applying a first magnetic field to an induction coil of the resistance sensor
Implementation Method 2
The electric field may have the form of an eddy-current, and a second magnetic field may be formed in a direction perpendicular to or substantially perpendicular to the electric field
Data Source
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AI summary
An apparatus for inspecting a dry electrode, the apparatus including: a feeder to feed a dry electrode film (110, 210, 410, 610, 710, 812) corresponding to a freestanding film; a resistance sensor (120, 220_1, 220_2, 220_3, 420, 620_1, 620_2, 620_3, 620_4, 720, 814) to contactlessly measure an electrical resistance value of the dry electrode film (110, 210, 410, 610, 710, 812) fed by the feeder; and a trimmer (640, 730) to remove an edge portion (114, 614) having a width from a widthwise end portion of the dry electrode film (110, 210, 410, 610, 710, 812).