Battery Packaging Material Resin-Particle Surface for Tape Peeling
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Solution Overview
Problem
Existing packaging materials for power storage devices face issues with adhesive residues from protective tapes and colored layers, leading to appearance deterioration and poor peeling performance.
Innovation Solution
A battery packaging material configuration featuring a substrate layer, heat-fusible resin layer, barrier layer, and a substrate protective layer with a binder resin and solid fine particles, where the binder resin content is between 45% to 70% and solid fine particles are 30% to 55% by mass, ensuring balanced adhesive strength for easy peeling without residue.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the protective tape firmly adheres to the packaging material to prevent peeling during production, then the adhesive strength is improved, but adhesive residues remain on the packaging material after peeling
Solution Approach 1:
The packaging material surface is divided into two types of regions: resin-rich regions that provide strong adhesive bonding to prevent tape peeling during production, and particle-rich regions that facilitate clean tape removal without residues. This local differentiation of surface properties resolves the contradiction between strong adhesion and residue-free peeling.
Solution Approach 2:
The surface composition is controlled by adjusting the content ratio of binder resin to solid particles, creating zones with different adhesive characteristics. The resin-rich zones maintain strong bonding while particle-rich zones enable clean release, allowing the tape to both adhere firmly and peel cleanly.
2Object-generated harmful factors
If the protective tape is peeled off after production to remove adhesive residues, then the appearance is improved, but the colored layer may be peeled off together with the protective tape
Solution Approach 1:
The particle-rich regions provide a low-adhesion surface that allows tape removal without damaging the colored layer, while resin-rich regions maintain strong bonding. This spatial differentiation enables selective peeling behavior that protects the colored layer during tape removal.
Solution Approach 2:
The solid particles on the surface act as an intermediary layer between the protective tape and the colored layer beneath. This intermediate structure facilitates tape removal while preventing direct adhesive contact with the colored layer, thus avoiding damage.
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 material allows for clean peeling of protective tapes without adhesive residue and maintains necessary adhesive strength, improving appearance and functionality by balancing adhesive properties and reducing residue visibility.
Implementation Method 1
the substrate protective layer includes a binder resin and solid fine particles... a content rate of the binder resin in the substrate protective layer is 45 mass% to 70 mass%
Data Source
AI summary
A battery packaging material includes a substrate layer, a heat-fusible resin layer, a barrier layer arranged between the substrate layer and the heat fusible resin layer, and a substrate protective layer arranged as an outermost layer on an outer side of the substrate layer. The substrate protective layer includes a binder resin and solid fine particles, and a content rate of the binder resin in the substrate protective layer is 45 mass% to 70 mass%.