Patterned Electrode Tape for Air Bubble Escape in Li-Ion Cells
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Solution Overview
Problem
The strong interaction between the adhesive layer of electrode tapes and metal foils in lithium secondary batteries leads to air bubble generation, which hinders structural stability and can cause can insertion defects due to the difficulty in air bubble escape, necessitating additional processes like roller application.
Innovation Solution
A tape for electrodes with an adhesive part featuring an intaglio region pattern on its surface, allowing air bubbles to escape and reducing their generation, thereby enhancing structural stability without requiring additional processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If an adhesive layer is applied to the entire surface of the tape for an electrode, then strong adhesion to the metal foil is achieved, but air bubbles are generated and difficult to escape
Solution Approach 1:
The adhesive layer is applied in a pattern rather than uniformly across the entire surface. Specifically, the adhesive layer is applied to only a portion of the tape surface (e.g., 30-70% coverage), creating regions with and without adhesive. This local differentiation allows the adhesive regions to provide strong bonding while the non-adhesive regions serve as air bubble escape paths, resolving the contradiction between adhesion strength and air bubble generation.
2Object-generated harmful factors
If a patterned adhesive layer is used, then air bubble escape paths are created, but adhesion strength may be reduced
Solution Approach 1:
The pattern parameters of the adhesive layer are optimized to balance adhesion and air bubble escape. The pattern includes specific geometric characteristics such as line width (0.1-5mm), spacing (0.1-5mm), and coverage ratio (30-70%). By controlling these parameters, sufficient adhesive area is maintained for strong bonding while adequate non-adhesive pathways are provided for air bubble escape, resolving the contradiction between these two requirements.
3Object-generated harmful factors
If roller application process is used to remove air bubbles, then air bubble removal is achieved, but process complexity increases
Solution Approach 1:
The patterned adhesive layer structure enables self-service air bubble removal without requiring external roller application equipment. The non-adhesive regions in the pattern automatically serve as escape paths for air bubbles during the taping process, allowing air bubbles to escape naturally as the tape is applied to the electrode. This eliminates the need for additional roller removal processes, reducing process complexity while maintaining effective air bubble removal.
Data Source
AI summary
A tape for an electrode includes a base film; and an adhesive part provided on a first surface of the base film, wherein the adhesive part includes an adhesive layer and an intaglio region, the intaglio region defining a pattern, provided over an entire second surface of the adhesive part.