Battery Adhesive Sheet Insulation Strength Trade-off
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Solution Overview
Problem
Pressure sensitive adhesive sheets for batteries with insulating materials often exhibit local deterioration in insulation properties and inadequate adhesive strength due to irregular particle distributions in the adhesive layer, leading to conductive pathways and reduced overall insulation performance.
Innovation Solution
A pressure sensitive adhesive sheet with a base material and a pressure sensitive adhesive layer containing inorganic fine particles, where the particle size distribution is optimized to prevent cohesive body formation and ensure uniform dispersion, enhancing both adhesive strength and insulation properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If insulating materials are added to the pressure sensitive adhesive layer, then insulation properties are improved, but adhesive strength deteriorates due to irregular particle distribution
Solution Approach 1:
The patent optimizes the particle size parameters of inorganic fine particles (D50 between 0.01-2.0 μm, D90/D50 ratio between 1.1-2.0) to achieve uniform dispersion in the adhesive layer. This parameter optimization prevents particle aggregation while maintaining insulation properties and adhesive strength.
Solution Approach 2:
The patent ensures uniform distribution of inorganic fine particles throughout the pressure sensitive adhesive layer, creating consistent local insulation properties across the entire adhesive area. This prevents localized conductive pathways while maintaining overall adhesive performance.
2Reliability
If insulating materials are added to the pressure sensitive adhesive layer, then insulation properties are improved, but surface irregularities occur leading to inadequate adhesive strength
Solution Approach 1:
The patent controls particle size parameters (D50: 0.01-2.0 μm, D90/D50 ratio: 1.1-2.0) to ensure fine particles disperse uniformly without forming visible surface irregularities. This maintains both insulation properties and surface smoothness for adequate adhesive contact.
Solution Approach 2:
The patent uses finely divided inorganic particles (sub-micron to micrometer scale) that can be uniformly distributed throughout the adhesive matrix, preventing aggregation and surface irregularities while maintaining insulation properties.
3Reliability
If inorganic fine particles are contained in the pressure sensitive adhesive layer, then insulation properties are improved, but particle aggregation occurs reducing adhesive performance
Solution Approach 1:
The patent optimizes particle size distribution parameters (D50: 0.01-2.0 μm, D90/D50 ratio: 1.1-2.0) to prevent particle aggregation. This controlled size distribution ensures uniform dispersion throughout the adhesive layer, maintaining both insulation properties and compositional stability.
Solution Approach 2:
The patent creates a composite pressure sensitive adhesive layer combining organic adhesive matrix with inorganic fine particles. This composite structure provides insulation properties while the fine particle size ensures uniform distribution and prevents aggregation.
Data Source
AI summary
A pressure sensitive adhesive sheet for batteries that includes a base material and a pressure sensitive adhesive layer provided on one surface side of the base material and containing inorganic fine particles. When D50 and D90 are defined as a volume-based accumulated 50% particle diameter of the inorganic fine particles and a volume-based accumulated 90% particle diameter of the inorganic fine particles, respectively, in a particle size distribution of the inorganic fine particles in the pressure sensitive adhesive layer, the D50 is 0.5 μm or more and 2.8 μm or less, and the ratio of the D90 to the D50 (D90/D50) is 1.3 or more and 2.0 or less. The particle size distribution is measured by image analysis on a surface of the pressure sensitive adhesive layer opposite to the base material.