Coated Sheet Tab Preparation Using Heat and Solvent
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Solution Overview
Problem
Existing methods for preparing electrode sheets for batteries are inefficient and of poor quality, particularly when removing electrode material to attach conductive tabs, as they are either inflexible or time-consuming, especially for thin foils with tightly adhered materials on both sides.
Innovation Solution
An apparatus and method that applies heat and solvent to selectively remove electrode material from coated sheets, using a heated surface and solvent applicator to loosen and scrape off the material, allowing for rapid and high-quality exposure of the substrate for tab attachment, significantly reducing processing time and improving throughput.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional mechanical scraping methods are used to remove electrode material, then the substrate can be exposed for tab attachment, but the process is time-consuming and the substrate quality is poor
Solution Approach 1:
The patent applies heat and solvent to change the physical and chemical parameters of the electrode material, transforming it from a tightly adhered state to a softened, dissolved state that can be easily removed. This parameter change enables rapid removal while achieving clean substrate exposure, resolving the contradiction between processing time and substrate quality.
Solution Approach 2:
The patent introduces solvent as an intermediary substance that facilitates the removal of electrode material. The solvent penetrates the electrode layer, softens the binder, and enables easy separation of the material from the substrate, achieving both speed and quality in the removal process.
2Strength
If electrode material is tightly adhered to thin foils on both sides, then mechanical strength is improved, but removal becomes extremely difficult and time-consuming
Solution Approach 1:
The patent uses heat and solvent to change the adhesion parameters of the electrode material. The heat softens the binder while the solvent dissolves it, fundamentally changing the adhesion strength from high to low, enabling rapid removal without damaging the thin foil substrate.
Solution Approach 2:
The patent replaces mechanical scraping methods with a chemical-thermal removal system. Instead of using mechanical force to peel off tightly adhered material, the system uses solvent chemistry and thermal energy to facilitate easy removal, dramatically improving productivity for thin foil applications.
3Device complexity
If solvent is applied without heat, then the process is simpler, but the solvent penetration and material removal are insufficient
Solution Approach 1:
The patent merges heat application and solvent application into a combined processing system. The heat and solvent work synergistically, with heat enhancing solvent penetration and solvent facilitating material removal, achieving superior removal quality that neither method could achieve alone.
Solution Approach 2:
The patent uses heat to change the temperature parameter of the solvent and electrode material, enhancing solvent penetration capability and accelerating the softening/dissolution process. This parameter change transforms insufficient removal into complete, high-quality material removal.
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 approach enables rapid and high-quality removal of electrode material, reducing processing time by at least 40% and achieving a clean, mirror-like substrate, facilitating faster assembly of tabbed electrodes with improved electrical characteristics for high-power applications.
Implementation Method 1
applying heat to the coated sheet while exposing the electrode material to solvent
Implementation Method 2
exposing the electrode material to solvent
Data Source
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AI summary
Apparatus and method are described that are useful in preparing a tabbed electrode sheet for use in assembling an electrochemical storage device. To provide clean surfaces for attaching conductive tabs, portions of a coated electrode sheet are selectively removed by contacting the sheet with heat and solvent, and mechanically removing electrode material in solvent-exposed areas.