Oblique Electrode Cutter Geometry for Low-Binder Slitting
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Solution Overview
Problem
Existing electrode manufacturing processes face challenges in cutting electrodes with minimal binder content, leading to detachment of active materials and cracks during cutting, which affects the charging capacity and quality of secondary batteries.
Innovation Solution
An apparatus with a modified cutter design and a pusher mechanism that includes a first cutter with an obliquely extending surface and a second cutter for supporting the electrode plate, along with a pusher that pressurizes the plate intermittently, to improve cutting quality and minimize damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If binder content is reduced to increase charging capacity, then charging capacity is improved, but cutting quality deteriorates causing active material detachment and cracks
Solution Approach 1:
The invention changes the geometric parameters of the cutter, specifically designing an oblique cutting surface with a controlled angle (α) between 5-15 degrees relative to the cutting direction. This parameter modification allows the cutter to gradually compress and then cut the electrode plate, preventing active material detachment even when binder content is reduced for higher charging capacity.
Solution Approach 2:
The cutter design combines multiple functional surfaces in a single tool: an oblique compression surface for gradual pressure application, a vertical cutting surface for the actual cut, and a tapered relief surface for material ejection. This composite structure enables the cutter to perform multiple functions (compression, cutting, and debris removal) simultaneously, maintaining cutting quality with minimal binder content.
2Device complexity
If conventional cutting method is used, then manufacturing process is simple, but electrode plate damage occurs due to uneven pressure distribution
Solution Approach 1:
The cutter design applies local quality by creating different surface geometries in different regions of the cutting tool. The oblique surface (α=5-15°) applies gradual compression at the entry point, the vertical surface provides the primary cutting action in the middle region, and the tapered relief surface facilitates debris ejection at the exit point. This localized functional differentiation prevents electrode plate damage while maintaining a relatively simple single-cutter design.
3Productivity
If cutting speed is increased to improve productivity, then manufacturing efficiency is improved, but cutting precision deteriorates due to insufficient pressure application time
Solution Approach 1:
The oblique cutting surface creates a periodic compression-cum-cutting action as the cutter moves through the electrode plate. The gradual angle (α=5-15°) creates a staged pressure application process that occurs continuously during the cutting motion, allowing sufficient pressure application time even at high cutting speeds. This periodic mechanical action maintains cutting precision while enabling high productivity.
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
The apparatus enhances cutting precision and quality by uniformly distributing pressure across the electrode plate, preventing detachment of active materials and reducing damage, thus improving the overall performance of secondary battery electrodes.
Implementation Method 1
a first cutter (10) including a first cutting surface (11) extending side by side along a movement direction of an electrode plate (2) moving from an inflow region (40) to an outflow region (50) and an obliqued surface (13) extending obliquely from one edge of the first cutting surface (11) in a direction away from the electrode plate (2), and a second cutter (20) supporting the electrode plate (2), wherein the first cutter (10) moves along a direction in which the second cutter (20) is positioned to pressurize the electrode plate (2) onto the first cutting surface (11)
Data Source
AI summary
The present disclosure relates to an apparatus for manufacturing an electrode, including: an inflow region where an electrode plate flows in; an outflow region where an electrode plate is cut into a preset size and flows out; a first cutter including a first cutting surface extending side by side along a movement direction of the electrode plate moving from the inflow region to the outflow region and an obliqued surface extending obliquely from one edge of the first cutting surface in a direction away from the electrode plate; and a second cutter supporting the electrode plate, wherein the first cutter moves along a direction in which the second cutter is positioned to pressurize the electrode plate to the first cutting surface.