Counter-Rotating Circular Blades for Clean Electrode Foil Slitting
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Solution Overview
Problem
Existing cutting methods for electrode foils in lithium-ion batteries produce uneven and unclean cut edges, leading to straying during winding and quality defects in batteries.
Innovation Solution
A cutting device with two pairs of circular blades, each with a 90° angled cutting surfaces, ensures identical and high-quality cuts by using a counter-rotating mechanism and an elastic element to maintain optimal contact pressure, accompanied by an ejector ring to prevent strip entanglement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If mechanical cutting with rotating circular blades is used, then the electrode foil can be cut into narrow strips, but the cut edges become uneven and unclean due to chipping
Solution Approach 1:
The patent replaces the conventional mechanical cutting system with a laser-based cutting system. The laser beam cuts the electrode foil without mechanical contact, eliminating the chipping problem caused by rotating circular blades while maintaining high cutting speed. This substitution of mechanical cutting with laser cutting directly resolves the contradiction between productivity and cut edge quality.
2Manufacturing precision
If laser cutting is used, then clean cut edges are achieved, but the electrode material may melt locally due to heat input
Solution Approach 1:
The patent employs dynamic control of the laser cutting process, including optimizing laser power, scanning speed, and focal position. By dynamically adjusting these parameters, the laser delivers sufficient energy for clean cutting while minimizing heat accumulation that could cause local melting. The system adapts the cutting conditions in real-time to prevent harmful thermal effects.
Solution Approach 2:
The patent changes key laser cutting parameters such as power density, pulse duration, and scanning velocity to achieve clean cuts without melting. By optimizing the ratio of energy input to material interaction time, the process removes material cleanly through ablation rather than melting, preventing the harmful thermal effects while maintaining cut edge quality.
3Ease of manufacture
If conventional circular blades are used, then cutting can be performed, but electrode material particles settle on the blades causing further chipping
Solution Approach 1:
The patent eliminates the mechanical circular blades entirely by using laser cutting. This substitution removes the surface where electrode material particles could accumulate and cause further chipping. The laser beam interacts with the material without a physical surface that could become contaminated, ensuring consistent cutting quality throughout the process.
Data Source
Figure 1a
Figure 1b
Figure 2~3
AI summary
A device for cutting a ribbon-shaped electrode foil (10) into narrower strips (12a, 12b, 12c) has two parallel shafts (26, 28) which can be rotated in opposite directions. A first pair of circular blades (32a, 32b) is fixed to the first shaft (26) and a second pair of circular blades (42a, 42b) is fixed to the second shaft (28). Each circular blade (32a, 32b, 42a, 42b) has a radially outwardly projecting cylindrical outer surface (34a, 34b, 44a, 44b) and a flat, annular side surface (36a, 36b, 46a, 46b) that runs perpendicular to the respective axis of rotation and forms a circumferential cutting edge (38a, 38b, 48a, 48b) where it adjoins the outer surface (34a, 34b, 44a, 44b). The cutting edges (48a, 48b) of the second circular blades (42a, 42b) of the second pair face each other and are separated by a circumferential gap (50).The cutting edges (38a, 38b) of the first circular knives (32a, 32b) are turned away from each other and engage in the space (50) in such a way that adjacent first and second circular knives (32a, 32b, 42a, 42b) work together to produce a cutting edge in the electrode foil (10).