Secondary Battery Packaging Material Adhesive Layer Design
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Solution Overview
Problem
Secondary battery packaging materials with dry lamination structures lack sufficient heat resistance and chemical resistance, leading to reduced strength and reliability, especially when exposed to high temperatures.
Innovation Solution
A secondary battery packaging material is developed with a substrate layer, a metal foil layer, an anti-corrosion treatment layer, an adhesive layer containing specific polyolefins with varying melting temperatures, and a heat-sealable resin layer, which enhances chemical resistance, heat resistance, and deep drawing properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a dry lamination structure is used for packaging material, then manufacturing simplicity and cost are improved, but heat resistance and chemical resistance deteriorate
Solution Approach 1:
The patent uses a composite adhesive layer containing multiple polyolefins with different melting temperatures (first polyolefin: 90-150°C, second polyolefin: 60-90°C) to achieve both manufacturing simplicity and improved heat resistance. This composite approach allows the material to maintain ease of manufacture through dry lamination while gaining enhanced thermal and chemical resistance properties.
Solution Approach 2:
The patent changes the physical parameters of the adhesive layer by selecting polyolefins with specific melting temperature ranges. The first polyolefin has a melting temperature of 90-150°C and the second has 60-90°C, creating a multi-stage melting behavior that improves heat resistance while maintaining processability during manufacturing.
2Ease of manufacture
If a dry lamination structure is used for packaging material, then manufacturing cost and simplicity are improved, but chemical resistance deteriorates
Solution Approach 1:
The composite adhesive layer combining multiple polyolefins provides enhanced chemical resistance while maintaining the cost-effectiveness of dry lamination manufacturing. The specific selection of polyolefins with different melting points creates a more chemically resistant structure without requiring complex manufacturing processes.
3Reliability
If packaging material is heat-treated to improve heat resistance, then heat resistance is improved, but deep drawing properties and crack resistance deteriorate
Solution Approach 1:
The patent changes the melting temperature parameters of the adhesive layer components to achieve heat resistance without excessive heat treatment. The first polyolefin (90-150°C) and second polyolefin (60-90°C) provide progressive melting behavior that improves heat resistance while maintaining flexibility and deep drawing properties at lower temperatures.
Solution Approach 2:
The adhesive layer is segmented into multiple polyolefin components with different melting temperatures, allowing different portions of the material to respond to different temperature levels. This segmentation enables heat resistance improvement while preserving deep drawing properties through the lower-melting second polyolefin.
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 packaging material exhibits improved chemical resistance, heat resistance, deep drawing properties, and crack resistance, ensuring reliable performance and extended lifespan.
Implementation Method 1
a first polyolefin having a highest melting temperature has a melting temperature of from not less than a heat-resistance imparting temperature to not more than a critical substrate layer thermal deterioration temperature; and of the two or more of polyolefins, a second polyolefin having a lowest melting temperature has a melting temperature of from not less than a critical heat-resistance temperature to not more than a lamination temperature
Data Source
AI summary
A secondary battery packaging material according to the present invention includes: a substrate layer having a first surface and containing polyester or polyamide; a metal foil layer laminated on the first surface of the substrate layer; an anti-corrosion treatment layer laminated on the metal foil layer; an adhesive layer laminated on the anti-corrosion treatment layer and containing two or more polyolefins; and a heat-sealable resin layer laminated on the adhesive layer. Of the two or more polyolefins, a first polyolefin having a highest melting temperature of the two or more polyolefins with a melting temperature of from not less than a heat-resistance imparting temperature to not more than a critical substrate layer thermal deterioration temperature; and of the two or more of polyolefins, and a second polyolefin having a lowest melting temperature of the two or more polyolefins with a melting temperature of from not less than a critical heat-resistance temperature to not more than a lamination temperature.