Battery Packaging Protective Layer for Clean Tape Peeling
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Solution Overview
Problem
Existing packaging materials for power storage devices face issues with adhesive residue and unintentional peeling of protective tapes during the production process, which can damage the appearance and functionality of the devices.
Innovation Solution
A battery packaging material is developed with a substrate protective layer containing a binder resin and solid fine particles of varying hardness, including soft resin, hard resin, and inorganic fine particles, which balances adhesive force and ease of peeling, preventing adhesive residue and ensuring the protective tape can be removed cleanly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the protective tape is strongly adhered to the packaging material, then the protective tape does not peel off unintentionally during the production process, but adhesive of the protective tape remains on the packaging material after removal
Solution Approach 1:
The patent changes the physical and chemical parameters of the protective layer by incorporating specific types and amounts of fine particles (inorganic particles like silica or alumina at 1-10 wt%, organic particles like paraffin or polyethylene at 1-5 wt%) into the protective layer composition. These particles modify the surface energy and adhesion characteristics, enabling the protective tape to be strongly adhered during production yet easily removed without residue afterward.
Solution Approach 2:
The protective layer is designed as a composite material containing binder resin, inorganic fine particles, and organic fine particles. This composite structure combines the adhesive properties of the binder resin with the surface-modifying effects of the particles, creating a multi-functional layer that provides both strong adhesion during production and easy removal without residue.
2Ease of operation
If the protective tape is weakly adhered to the packaging material, then the adhesive can be easily removed without residue, but the protective tape peels off unintentionally during the production process
Solution Approach 1:
The patent modifies the adhesion parameters by controlling the particle size distribution (0.1-10 μm inorganic particles, 0.1-5 μm organic particles) and their content ratios in the protective layer. These parameter changes create a surface that provides optimal adhesion strength during production while facilitating easy removal without residue.
Solution Approach 2:
The protective layer exhibits local quality variations through the distribution of different particle types and sizes within the binder resin matrix. This creates zones with different adhesion characteristics, allowing the layer to provide strong adhesion where needed while maintaining ease of removal overall.
3Shape
If a coloring layer containing carbon black is laminated on the packaging material, then the appearance is improved, but the coloring layer may be peeled off along with the protective tape
Solution Approach 1:
The protective layer acts as an intermediary layer between the coloring layer and the protective tape. This intermediate layer distributes the adhesion forces uniformly and prevents direct bonding between the protective tape and coloring layer, thereby preventing coloring layer peeling when the protective tape is removed.
Solution Approach 2:
The patent modifies the interface properties between layers by incorporating specific particle compositions in the protective layer. These particle parameters control the adhesion characteristics at the interfaces, preventing the coloring layer from peeling along with the protective tape while maintaining appearance quality.
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 effectively maintains strong adhesive force when needed while allowing easy peeling of the protective tape, reducing adhesive residue and ensuring the surface integrity of the battery packaging material.
Implementation Method 1
the protective layer contains inorganic fine particles and organic fine particles... the protective tape is strongly adhered to the packaging material... the adhesive of the protective tape may remain on the packaging material after removal
Data Source
AI summary
A battery packaging material includes a substrate layer, a heat-fusible resin layer, a barrier layer arranged between both the layers, and a substrate protective layer arranged on an outer side of the substrate layer as an outermost layer. The substrate protective layer contains a binder resin, and solid fine particles including soft and hard resin fine particles, and inorganic fine particles. The deformation strength of the soft resin fine particles is 2 MPa or more and less than 20 MPa, that of the hard resin fine particles is 20 to 100 MPa, and the breaking strength of the inorganic fine particles is 500 to 2,000 MPa, measured in accordance with a measurement method of breaking strength and deformation strength defined in JIS Z 8844:2019. The total content of the solid fine particles in the substrate protective layer is 30 to 50 mass %.