Electrode Foil Particle-Stream Cutting for Burr-Free Battery Slitting
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Solution Overview
Problem
Current methods for cutting electrode foils in lithium-ion batteries face challenges such as high tool wear, limited cutting speed, increased costs, reduced battery capacity, and safety concerns due to burr formation and heat-affected zones, particularly with mechanical and laser cutting techniques.
Innovation Solution
A method utilizing a cutting device with a nozzle and particle stream, where abrasive particles are accelerated by a gas stream to cut the electrode foils without mechanical contact, using a sonotrode excited by high-frequency vibrations to achieve high-speed cutting with reduced tool wear and no heat-affected zones.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If mechanical cutting with upper and lower blades is used, then cutting can be performed, but high friction leads to faster tool wear and limited cutting speed
Solution Approach 1:
The patent replaces the mechanical blade-cutting system with a laser beam cutting system. The laser beam eliminates physical contact between cutting tools and the workpiece, thereby eliminating friction entirely. This substitution enables high cutting speeds while preventing tool wear, as the laser beam does not consume or wear down during the cutting process.
Solution Approach 2:
The patent introduces a gas stream (pneumatic field) to blow away molten material and particles from the cutting zone. This pneumatic assistance prevents particle adhesion to the cutting edge and maintains cutting efficiency, allowing sustained high-speed operation without tool degradation.
2Productivity
If laser cutting is used, then high cutting speed can be achieved, but the process is energy-intensive and generates a heat-affected zone that burns active material
Solution Approach 1:
The patent changes the laser wavelength parameter to green laser (532 nm), which has optimal absorption characteristics for metallic surfaces. This parameter change increases light absorption efficiency while reducing the energy required for cutting, thereby minimizing the heat-affected zone and preventing burning of active material.
Solution Approach 2:
The patent uses a gas stream to cool the cutting zone and blow away molten material, preventing excessive heat accumulation and reducing the heat-affected zone. The gas flow removes heat from the vicinity of the cut, protecting the active material from thermal damage.
3Productivity
If mechanical notching is performed separately after slotting, then notching can be executed, but the electrode feed must be stopped at regular intervals, reducing cutting speed
Solution Approach 1:
The patent combines slotting and notching operations into a single continuous laser cutting process. The laser beam can perform both longitudinal slitting and transverse notching without requiring the electrode feed to stop, eliminating the need for separate machines and maintaining continuous high-speed operation.
Solution Approach 2:
The laser cutting system is designed to perform multiple functions: it can execute both slotting (longitudinal cutting) and notching (transverse cutting) operations with the same device. This multi-functionality eliminates the need for separate mechanical notching machines and enables continuous processing.
4Ease of manufacture
If conventional mechanical cutting is used, then cutting can be performed, but burr formation and particle adhesion occur, requiring thorough cleaning
Solution Approach 1:
The patent replaces mechanical blade cutting with laser beam cutting, which melts and vaporizes material rather than mechanically separating it. This eliminates the mechanical contact that causes burr formation and particle adhesion to cutting edges, producing clean cut surfaces without requiring extensive cleaning.
Solution Approach 2:
The patent employs a gas stream to blow away molten particles and debris from the cutting zone in real-time. This pneumatic cleaning prevents particle adhesion and maintains cut edge quality throughout the cutting process, eliminating the need for subsequent cleaning operations.
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 burr-free cutting at high speeds, reduces tool wear, and eliminates heat-affected zones, resulting in a more efficient and cost-effective process suitable for both slitting and notching, with the potential for increased battery performance and safety.
Implementation Method 1
Introducing a first gas stream from a gas supply line into the cutting device; Introducing at least particles from a particle supply line into the cutting device; Mixing the first gas stream and at least the particles in the cutting device to form a particle stream
Implementation Method 2
The nozzle is arranged above the electrode foil at a distance from a surface of the electrode foil, and the electrode foil is cut by the particle stream
Data Source
Figure 1
Figure 2~3
Figure 4~5
AI summary
A method for cutting electrode foils (1) intended for use in a battery cell by means of a particle stream (2) is proposed. A cutting device (4) for cutting electrode foils (1) intended for use in a battery cell is further described, comprising at least a nozzle (5) with an outlet (6), a particle feed line (8) for supplying at least particles (11), and a gas feed line (9) for supplying a first gas stream (10), wherein the particles (11) and the gas stream (10) are miscible in the cutting device (4) to form a particle stream (2) and can be fed to the outlet (6) via the nozzle (5), wherein the nozzle (5) can be arranged above the electrode foil (1) at a distance (7) from a surface (3) of the electrode foil (1), and the electrode foil (1) can be cut at least by the particle stream (2).