Battery Adhesive Sheet Balancing Insulation and Foreign Material Detection
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Solution Overview
Problem
Conventional pressure sensitive adhesive sheets for batteries face challenges in maintaining high insulation properties while effectively detecting foreign materials, leading to potential internal short circuits and safety issues as energy densities increase in lithium-ion batteries.
Innovation Solution
A pressure sensitive adhesive sheet for batteries comprising a base material with a pressure sensitive adhesive layer containing inorganic fine particles, with a haze value of 50% to 65% and total luminous transmittance of 80% or more, allowing easy detection of foreign materials and enhancing insulation properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an insulation layer is provided separately from the pressure sensitive adhesive layer, then insulation properties are improved, but manufacturing cost increases
Solution Approach 1:
The patent merges the insulation function with the pressure sensitive adhesive layer by incorporating inorganic fine particles directly into the adhesive layer. This eliminates the need for a separate insulation layer, thereby reducing manufacturing complexity and cost while maintaining high insulation properties through the particle-filled adhesive composition.
Solution Approach 2:
The patent creates a composite pressure sensitive adhesive layer by combining an adhesive matrix with inorganic fine particles. This composite structure provides both adhesive functionality and insulation properties simultaneously, resolving the contradiction between needing separate layers for each function versus maintaining a simple single-layer structure.
2Reliability
If inorganic fine particles are contained in the pressure sensitive adhesive layer, then insulation properties are improved, but detection of foreign materials becomes difficult
Solution Approach 1:
The patent specifies that the inorganic fine particles should have a color different from both the base material and the adhesive layer, creating visual contrast. This allows foreign materials to be easily detected through color differentiation, resolving the contradiction between having a particle-filled adhesive layer for insulation and being able to visually detect foreign materials.
3Reliability
If the pressure sensitive adhesive layer contains inorganic fine particles, then insulation properties are improved, but the sheet becomes less transparent
Solution Approach 1:
The patent optimizes parameters including particle size, particle concentration, and particle refractive index to balance insulation properties with transparency. By carefully controlling these parameters, the adhesive layer maintains sufficient insulation through particle incorporation while preserving enough transparency to allow visual detection of foreign materials.
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 adhesive sheet provides high insulation and transparency, enabling safe lithium-ion batteries by facilitating the detection and prevention of foreign materials, thus enhancing safety and manufacturing efficiency.
Implementation Method 1
the pressure sensitive adhesive layer is configured to have a haze value of 50% or more and 65% or less, thereby the pressure sensitive adhesive sheet for batteries has high insulation properties
Implementation Method 2
the pressure sensitive adhesive layer contains inorganic fine particles, wherein the haze value of the pressure sensitive adhesive layer is 50% or more and 65% or less
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. The haze value of the pressure sensitive adhesive layer is 50% or more and 85% or less.