Battery Packaging Material for Clean Protective Tape Removal
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Solution Overview
Problem
Existing battery packaging materials face issues with adhesive residue and unintended peeling of protective tapes during the production process, particularly when a coloring layer containing carbon black is involved, as conventional solutions do not effectively prevent adhesive residue on packaging materials without a carbon black outermost layer.
Innovation Solution
A battery packaging material comprising a substrate protective layer with specific Young's modulus and tensile strength, a barrier layer, and a heat-fusible resin layer, where the substrate protective layer is composed of a resin composition with solid fine particles, ensuring the protective tape adheres firmly without peeling unintentionally and can be cleanly removed without leaving adhesive residue.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the protective tape is firmly adhered to the packaging material, then the adhesiveness prevents peeling during the production process, but the adhesive remains on the packaging material after removal
Solution Approach 1:
The patent changes the physical parameters of the packaging material surface by controlling the Young's modulus (50-300 MPa) and tensile strength at 40% elongation (5-20 MPa) of the substrate protective layer. These parameter changes create optimal surface properties that allow the protective tape to adhere firmly during production but enable clean removal without adhesive residue, resolving the contradiction between reliable adhesion and residue-free detachment.
2Reliability
If the protective tape is adhered to the packaging material with a coloring layer containing carbon black, then the protective tape prevents surface damage, but the coloring layer peels off along with the protective tape
Solution Approach 1:
The patent applies parameter changes to the substrate protective layer's mechanical properties (Young's modulus: 50-300 MPa, tensile strength at 40% elongation: 5-20 MPa). These controlled parameter changes ensure the protective layer has sufficient strength to prevent surface damage while maintaining flexibility that prevents the coloring layer from peeling off when the protective tape is removed.
Solution Approach 2:
The patent uses a composite resin composition containing specific components that provide both the required mechanical strength and flexibility. This composite material structure allows the substrate protective layer to function as an intermediate buffer between the protective tape and the coloring layer, preventing coloring layer peeling while maintaining protective function.
3Object-generated harmful factors
If the protective tape is loosely adhered to the packaging material, then the adhesive residue is minimized, but the protective tape peels off unintentionally during the production process
Solution Approach 1:
The patent optimizes the adhesion stability by precisely controlling the mechanical parameters of the substrate protective layer. The Young's modulus (50-300 MPa) and tensile strength at 40% elongation (5-20 MPa) are adjusted to create a balance where the protective tape adheres sufficiently to remain attached during production but can be removed cleanly without excessive adhesive residue.
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 described configuration ensures that the protective tape adheres firmly to the battery packaging material without peeling unintentionally and can be peeled off without leaving adhesive residue, addressing the issues of adhesive residue and peeling problems in existing technologies.
Implementation Method 1
heat-sealing peripheral portions of a pair of the battery packaging materials stacked one on the other with the heat-fusible resin layers faced each other
Data Source
AI summary
In a battery packaging material in which a substrate protective layer, a substrate layer, a barrier layer, and a heat-fusible resin layer are laminated in this order, the substrate protective layer is formed of a resin composition containing a resin component and solid fine particles. The Young's modulus of the substrate protective layer measured by a method specified in JIS K7127 is 0.5 MPa to 3 MPa, and the tensile strength at 40% elongation measured by a method specified in JIS K7127 is 5 MPa to 20 MPa.