Electrode Rolling with Adaptive Drawing for Non-Coated Swell
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Solution Overview
Problem
The issue of swell occurring in the non-coated portion of electrode substrates during the rolling process due to differences in drawability between coated and non-coated areas is not effectively addressed by existing methods, potentially worsening the problem.
Innovation Solution
A rolling apparatus with a non-coated portion drawing member that adjusts its position relative to the electrode substrate based on the state of the non-coated portion, using a monitoring unit to determine abnormal states and adjust the degree of drawing through advancement or retreatment to correct swell issues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a press is used to apply a uniaxial load to the positive electrode and a separate press is used to apply a uniaxial load to the negative electrode, then the electrode can be manufactured with controlled density and porosity, but the device complexity increases and manufacturing efficiency decreases
Solution Approach 1:
The patent combines two separate pressing operations into a single press by implementing a dual pressing mechanism within one device. The press includes a first pressing mechanism for the positive electrode and a second pressing mechanism for the negative electrode, both operated simultaneously or sequentially within the same pressing chamber, thereby reducing device complexity while maintaining manufacturing precision.
Solution Approach 2:
The single press is designed to perform multiple functions: it can apply uniaxial load to both positive and negative electrodes, control density, and adjust porosity. The pressing mechanism includes adjustable pressing members that can be configured for different electrode types and pressing requirements, making the device universal for manufacturing both electrode types with precise control over physical properties.
2Object-affected harmful factors
If a press is used to apply a uniaxial load to electrodes, then the electrode porosity can be adjusted to improve ion permeability, but the manufacturing time increases
Solution Approach 1:
The electrode slurry is prepared with pre-calculated and pre-mixed solvent content before the pressing step. The solvent amount is precisely determined in advance based on the desired porosity and ion permeability requirements. This preliminary preparation allows the pressing operation to proceed quickly without needing extended time for gradual solvent adjustment or multiple iterative pressing cycles.
Solution Approach 2:
The pressing process utilizes controlled parameter changes, specifically adjusting the pressing force and solvent content to directly achieve the desired porosity. By changing these parameters in a controlled manner during a single pressing operation, the method achieves optimal ion permeability without requiring extended manufacturing time or multiple processing steps.
3Object-affected harmful factors
If solvent is added to the electrode slurry to adjust porosity, then ion permeability improves, but the manufacturing process complexity increases
Solution Approach 1:
The solvent addition step and the pressing step are merged into a single integrated process. The solvent is added to the slurry immediately before pressing, and the pressing operation simultaneously achieves both solvent evaporation and porosity formation. This combination eliminates the need for separate, sequential steps for solvent addition, waiting, and then pressing, thereby reducing process complexity while maintaining improved ion permeability.
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 improves the production efficiency and quality of electrode assemblies by effectively managing swells in the non-coated portions, ensuring precise adjustment and alignment with the coated areas.
Implementation Method 1
by allowing the solvent to evaporate, the porosity of the electrode can be adjusted
Data Source
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AI summary
A rolling apparatus for manufacturing an electrode according to one embodiment of the present invention includes: a rolling member that rolls an electrode substrate when the electrode substrate passes through; and a non-coated portion drawing member that additionally draws the non-coated portion of the electrode substrate that has passed through the rolling member, wherein the non-coated portion drawing member is configured such that the relative position of the non-coated portion drawing member relative to the electrode substrate is adjusted according to the state of the non-coated portion of the electrode substrate.