Slitter Apparatus Blade Hardness and Angle for Electrode Cutting
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Solution Overview
Problem
Conventional slitter apparatuses for cutting electrochemical device electrodes often produce burrs and chips, leading to adhesion issues and increased production costs, as they fail to concentrate shear force effectively due to the active-material-containing layer, resulting in internal short circuits and complex cleaning processes.
Innovation Solution
A slitter apparatus with upper and lower blades of specific hardness (6.9×10^3 to 8.8×10^3 N/mm²) and surface roughness (≤4 μm) ranges, ensuring effective engagement and minimizing burr and chip formation, with the blades' thickness and included angle optimized to prevent adhesion and abrasion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional slitter apparatus with shear method or gang method is used to cut the sheetlike electrode, then the electrode can be cut in predetermined width, but burrs of the collector are likely to be made at cut surfaces and cutting chips are produced
Solution Approach 1:
The invention changes the geometric parameters of the cutting blades, specifically setting the included angle of the upper blades to 75-88 degrees and the thickness to 0.5-2.0 mm, which optimizes the concentration of shear force on the collector to prevent burr and chip formation while maintaining cutting effectiveness
Solution Approach 2:
The invention performs preliminary action by designing the upper blades with a specific included angle (75-88 degrees) before the cutting process, which enables the blades to effectively concentrate shear force on the collector and prevent burr formation at the cut surfaces
2Productivity
If conventional slitter apparatus is used, then cutting operation can be performed, but cleaning step for removal of copper powder is required after cutting anode
Solution Approach 1:
The invention changes the blade parameters (included angle of 75-88 degrees and thickness of 0.5-2.0 mm) to minimize chip production during cutting, which eliminates the need for subsequent cleaning steps and simplifies the overall production 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
The apparatus effectively suppresses burr and chip production, reducing the risk of internal short circuits and extending blade life by ensuring precise cutting and minimizing adhesion to the collector's edges, thereby enhancing the production efficiency of electrochemical devices.
Implementation Method 1
The slitter apparatus is arranged to be able to slit the sheetlike object in the predetermined width by shear force with rotation of the two rotary shafts
Data Source
AI summary
An electrode production method has an active-material-containing layer forming step of applying an electrode-forming coating solution containing an electrode active material, a binder capable of binding the electrode active material, and a liquid capable of dissolving or dispersing the binder, onto a collector sheet, and thereafter removing the liquid to form an active-material-containing layer on the collector, thereby obtaining a electrode sheet; and an electrode forming step of cutting the electrode sheet with a slitter apparatus to obtain an electrode.