Dry Electrode Coating Width Control for Accumulator Cells
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Solution Overview
Problem
Current methods for producing electrodes for lithium-ion batteries often rely on solvent-based processes, which can be inefficient and result in inconsistent coating widths, leading to suboptimal electrode performance and increased production costs.
Innovation Solution
A solvent-free dry electrode production method using a device with multiple rollers to apply and compact electrode active materials directly onto metal foil strips, allowing for precise control of coating width through mechanical elements like pinch knives and scrapers, ensuring consistent and high-quality coatings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If solvent-based coating processes are used, then the coating application is easier, but the manufacturing precision of coating width deteriorates
Solution Approach 1:
The patent removes the solvent component from the coating process entirely, using only dry powder coating material. This extraction of the solvent eliminates the inconsistency issues associated with solvent evaporation and drying, while maintaining ease of application through the dry powder formulation that can be uniformly distributed by the roller mechanism.
Solution Approach 2:
The patent replaces the chemical-based solvent application system with a mechanical dry powder application system. The coating material is applied as dry powder through mechanical means (rollers,刮 blades) rather than through solvent-based chemical processes, improving precision while maintaining manufacturability.
2Manufacturing precision
If mechanical elements like pinch knives and scrapers are added to control coating width, then the manufacturing precision of coating width improves, but the device complexity increases
Solution Approach 1:
The patent divides the coating width control function into separate mechanical elements: pinch knives for defining the leading edge and scrapers for controlling the trailing edge. This segmentation allows each element to perform a specific function independently, achieving precise coating width control through simple, modular components rather than a complex integrated system.
Solution Approach 2:
Instead of trying to control coating width by adjusting the application process itself, the patent inverts the approach by using mechanical elements that physically remove or define the coating edges after application. The pinch knives and scrapers work by subtraction and definition rather than by precise positive control of the application boundaries.
3Loss of substance
If excess coating material is removed and reused, then the loss of substance decreases, but the processing time increases
Solution Approach 1:
The patent implements a material recovery system where excess coating material removed by the scrapers is collected and fed back into the coating process. This closed-loop system recovers what would otherwise be waste material, minimizing substance loss while integrating the recovery process into the continuous production flow to minimize time penalties.
Solution Approach 2:
The patent maintains continuous operation of the coating process with the scrapers and material recovery system integrated into the same production line. The excess material is removed and reused in a continuous manner rather than through batch processing, minimizing interruptions and maintaining continuous useful action throughout the process.
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 enables efficient, solvent-free production of electrodes with precise coating widths, enhancing performance and reducing waste, while maintaining high-quality edges and allowing for the reuse of excess material, thus improving the overall efficiency and cost-effectiveness of the battery production process.
Implementation Method 1
The coating material is applied or applied to the first side using a first application roller. In particular, the coating material is transferred directly from the first application roller to the material strip. Thus, the coating material is essentially rolled onto the material strip.
Implementation Method 2
A particularly advantageous process variant is one in which the coating material is compacted on the first application roller by means of a first pressure roller.
Implementation Method 3
The first coating width is determined by means of a squeezing knife, in particular by means of a squeezing cut on the first application roller.
Implementation Method 4
An alternative variant is a so-called kiss cut or roller punching. It is also advantageous if the first coating width is specified using a scraper, which scrapes the coating material off the first application roller.
Data Source
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AI summary
The invention relates to a method for manufacturing electrodes for accumulator cells, wherein a material strip (4) is coated at least on a first side (14) with a coating material (6) and wherein the coating material (6) is applied to the first side (14) by means of a first application roller (10).