Ultrashort-Pulse Laser Cutting of Fuel Cell Layer Stacks
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Solution Overview
Problem
Conventional methods for cutting fuel cell stacks using rotating blades are prone to wear, leading to imprecision, incomplete cuts, and require costly and cumbersome changes in blade geometry, while also risking contamination.
Innovation Solution
A method using a laser with pulsed beams of specific parameters (pulse duration < 10 ps, fluence > 127 J/cm², and pulse overlap > 50%) for precise cutting of fuel cell stacks without mechanical contact, allowing for easy pattern changes and reduced damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a rotating blade is used to cut the stack, then the cutting operation can be performed continuously, but the blade wears rapidly leading to imprecision and incomplete cuts
Solution Approach 1:
The patent replaces the mechanical rotating blade cutting system with a laser-based cutting system. The laser beam eliminates the mechanical contact and wear issues while maintaining continuous cutting capability. The laser parameters (pulse duration < 10 ps, fluence > 127 J/cm²) are optimized to achieve precise cutting without the degradation problems of mechanical blades.
2Adaptability or versatility
If the blade geometry is changed to cut different patterns, then new cutting patterns can be achieved, but producing distinct and specific rolls is cumbersome and costly
Solution Approach 1:
The patent implements a dynamic, software-controlled laser system that can change cutting patterns without physical hardware changes. The laser beam can be programmed to follow different paths and patterns, providing versatility while eliminating the need to manufacture and store multiple specialized mechanical blades or rolls.
3Productivity
If a mechanical blade is used to cut the stack, then the cutting operation can be performed, but the blade physically touches the fuel cell parts causing contamination
Solution Approach 1:
The patent replaces the mechanical blade that physically contacts the workpiece with a non-contact laser cutting system. The laser beam performs the cutting operation without touching the fuel cell parts, thereby eliminating contamination while maintaining productive cutting operation.
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 laser cutting method maintains high precision and efficiency over time, reduces contamination risk, and optimizes production line flexibility by eliminating the need for mechanical blade changes, achieving clean cuts at the atomic scale.
Implementation Method 1
using a laser generating a pulsed beam directed toward the stack, piloting the beam so as to follow a pattern to be cut in the stack, wherein the pulse duration of the beam is lower than 10 ps, wherein the fluence of the beam is greater than 127 J/cm²
Data Source
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AI summary
A method for cutting a stack of at least two layers, the method comprising: using a laser (40) generating a pulsed beam directed toward the stack (10), piloting the beam so as to follow a pattern to be cut in the stack (10), wherein the pulse duration of the beam is lower than 10 ps; wherein the fluence (Φ) of the beam is greater than 127 J/cm2, and wherein the pulse overlap (θ) of the beam between two successive pulses is greater than 50%.