Power Storage Exterior Laminate for High-Temperature Tape Adhesion
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Solution Overview
Problem
Existing exterior materials for electrical storage devices face challenges in maintaining high adhesion to pressure sensitive adhesive tapes in high-temperature environments and are prone to damage during high-temperature processing and stacking.
Innovation Solution
A laminate structure comprising a surface coating layer, a base material layer, and a heat-sealable resin layer, with a logarithmic decrement of the surface coating layer set to 0.120 or less at 60°C and 0.200 or less at 110°C, ensuring high adhesion and resistance to damage in these conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a surface coating layer is provided on the exterior material for protection and design, then the aesthetic appearance and protection are improved, but the adhesion to pressure sensitive adhesive tape deteriorates in high-temperature environments
Solution Approach 1:
The invention changes the surface properties of the coating layer by controlling the logarithmic decrement parameter (ΔE) to be 0.120 or less at 60°C. This parameter optimization ensures that the surface maintains appropriate friction and adhesion characteristics at elevated temperatures, allowing pressure sensitive adhesive tape to bond effectively while the coating provides protection and design functionality.
Solution Approach 2:
The exterior material uses a composite laminate structure consisting of a base material layer and a surface coating layer with specific properties. The coating layer is formulated as a composite material that combines protection functionality with controlled surface friction characteristics, achieving both protective function and adhesion compatibility with adhesive tapes in high-temperature environments.
2Productivity
If electrical storage devices are stacked for efficient space utilization during baking, then productivity is improved, but the risk of impact damage and deformation increases
Solution Approach 1:
The invention applies a surface coating layer with specifically controlled logarithmic decrement (ΔE ≤ 0.120 at 60°C) that provides cushioning protection before impact occurs during stacking. This pre-engineered surface property absorbs and distributes impact forces when devices are stacked during baking, preventing deformation and damage while maintaining the space-efficient stacked configuration for high productivity.
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 laminate structure provides high adhesion to pressure sensitive adhesive tapes in high-temperature environments and minimizes damage during processing, enhancing the durability and reliability of electrical storage devices.
Implementation Method 1
the logarithmic decrement ΔE of the outer surface of the surface coating layer of the laminate is 0.120 or less at 60° C. in measurement with a rigid body pendulum
Implementation Method 2
the logarithmic decrement ΔE at 110° C. in rigid body pendulum measurement of the outer surface of the surface coating layer of the laminate is 0.200 or less
Data Source
AI summary
This exterior material for a power storage device is configured from a laminate comprising at least a surface coating layer, a base layer, a barrier layer, and a heat sealing resin layer in order from the outside, and moreover is such that a logarithmic decrement ΔE at 60° C. in a rigid body pendulum measurement of the outside surface of the surface coating layer of the laminate is 0.12 or less.