Secondary Battery Electrode Plate Edge Bonding via Laser Melting
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Solution Overview
Problem
During the cutting process of secondary battery electrode plates, the active material layer tends to peel off at the cut edges, which can lead to performance issues and is not effectively addressed by existing methods that widen the core edge into a triangular cross section.
Innovation Solution
A secondary battery electrode plate with a thin-plate-shaped core made from metal foil, where a melted portion of the metal foil disperses and solidifies beyond the core's plate thickness region to adhere to the edge of the active material layer, preventing peeling without altering the core's edge shape.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the electrode precursor is cut with laser, then the electrode plate is manufactured efficiently, but the active material layer peels off at the cut edge
Solution Approach 1:
The patent converts the harmful effect of laser heat into a beneficial bonding mechanism. The laser melting of the metal foil core creates a molten state that, upon solidification, forms a strong mechanical interlock with the active material layer at the cut edge, transforming the potential harm of heat-induced damage into a beneficial anchoring effect that prevents peeling
Solution Approach 2:
The patent changes the physical state parameter of the metal foil core from solid to liquid and back to solid through controlled laser heating. This phase transition enables the core to flow and adhere to the active material layer at the cut edge, creating a bonded interface that prevents peeling while maintaining manufacturing efficiency
2Reliability
If the core edge is widened into a triangular cross section, then the active material layer is prevented from peeling, but the core shape is altered
Solution Approach 1:
The patent converts the harmful effect of laser heat into a beneficial bonding mechanism. The laser melting of the metal foil core creates a molten state that, upon solidification, forms a strong mechanical interlock with the active material layer at the cut edge, transforming the potential harm of heat-induced damage into a beneficial anchoring effect that prevents peeling
Solution Approach 2:
The patent changes the physical state parameter of the metal foil core from solid to liquid and back to solid through controlled laser heating. This phase transition enables the core to flow and adhere to the active material layer at the cut edge, creating a bonded interface that prevents peeling while maintaining the core's original flat edge shape
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 configuration effectively prevents the active material layer from peeling off at cut edges, maintaining the core's original edge shape and enhancing the stability and performance of the electrode plates.
Implementation Method 1
a melted portion produced by melting the metal foil disperses at an edge portion of the secondary battery electrode plate
Implementation Method 2
when manufacturing the secondary battery electrode plate or a semi-finished electrode plate to be used as the secondary battery electrode plate by cutting, with laser
Implementation Method 3
the melted portion spreads beyond a plate thickness region of the core to adhere to and solidify on an edge of the active material layer
Data Source
AI summary
This electrode plate for a secondary battery comprises a thin plate-shaped core formed from a metal foil and an active material layer formed on at least one surface of the core. A melted section of the metal foil forming the core is scattered at an end section of the electrode plate for a secondary battery so as to spread from the plate thickness range of the core to the end face of the active material layer, adheres thereto, and is solidified.