Battery Packaging Laminate for High-Temperature Seal Strength
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional battery packaging materials face challenges in maintaining high sealing strength, especially in high-temperature environments, due to the degradation of adhesive layers and contamination issues during molding, which affect the durability and hermeticity of batteries.
Innovation Solution
A battery packaging material comprising a laminate structure with a base material layer, a barrier layer, an adhesive layer, and a heat-sealable resin layer, where the adhesive layer has a logarithmic decrement of 2.0 or less at 120°C, and the heat-sealable resin layer has a specific tensile elastic modulus and contains a lubricant, ensuring effective prevention of adhesive layer crushing and maintaining sealing strength in high-temperature conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If an adhesive layer is provided between the barrier layer and heat-sealable resin layer to improve adhesive strength, then the adhesive strength between layers is improved, but the adhesive layer is crushed during heat sealing and sealing strength is reduced
Solution Approach 1:
The invention removes the adhesive layer from the laminate structure, using only a base material layer, barrier layer, and heat-sealable resin layer. This extraction eliminates the crushing problem during heat sealing while maintaining layer adhesion through direct bonding between the barrier layer and heat-sealable resin layer.
Solution Approach 2:
The invention uses a composite laminate structure combining a base material layer (resin film), barrier layer (metal foil or inorganic coating), and heat-sealable resin layer. This composite structure achieves both interlayer adhesion and heat sealability without requiring a separate adhesive layer.
2Ease of manufacture
If high temperature and high pressure are applied to heat-seal the heat-sealable resin layer, then sealing is achieved, but the adhesive layer is crushed and sealing strength is reduced
Solution Approach 1:
The adhesive layer is removed from the structure, eliminating the source of crushing during heat sealing. The heat-sealable resin layer directly bonds to the barrier layer without an intermediate adhesive layer that could be damaged by heat and pressure.
3Ease of operation
If the heat-sealable resin layer becomes soft in high-temperature environment, then the resin layer is more pliable, but durability against external force decreases and sealing strength is reduced
Solution Approach 1:
The laminate combines a heat-sealable resin layer (providing pliability at sealing temperature) with a barrier layer (metal foil or inorganic coating on base material layer, providing mechanical strength and durability). This composite structure maintains both pliability for sealing and strength for durability in high-temperature environments.
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 proposed solution effectively prevents adhesive layer crushing and maintains high sealing strength in high-temperature environments, while preventing mold contamination and ensuring continuous productivity, thus enhancing the durability and performance of batteries.
Implementation Method 1
an adhesive layer is provided between these layers to improve the adhesive strength
Implementation Method 2
the heat-sealable resin layer is heat-sealed with itself by applying a high temperature and a high pressure
Implementation Method 3
the heat-sealable resin layer contains a lubricant, contamination of the mold during molding is prevented
Data Source
AI summary
A battery packaging material including a laminate including at least a base material layer, a barrier layer, an adhesive layer, and a heat-sealable resin layer in this order, in which crushing of the adhesive layer is effectively prevented when the heat-sealable resin layer is heat-sealed with itself, and a high sealing strength is achieved in a high-temperature environment. The battery packaging material includes a laminate including at least a base material layer, a barrier layer, an adhesive layer, and a heat-sealable resin layer in this order, wherein the adhesive layer has a logarithmic decrement ΔE of 2.0 or less at 120° C. according to rigid-body pendulum measurement.