Polyolefin Sealant Layer for Battery Packaging Insulation
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Solution Overview
Problem
Conventional packaging materials for lithium ion batteries experience a decrease in insulation properties due to the destruction of the sealant layer during degassing heat sealing, which is exacerbated by the thinning of the sealant layer, leading to reduced laminating strength and heat seal strength.
Innovation Solution
A packaging material structure comprising a substrate layer, a metallic foil layer with anti-corrosion treatment, an adhesive resin layer, and a sealant layer, where at least one of the adhesive resin or sealant layers includes a polyolefin-based resin and an additive compound with a Solubility Parameter (SP) value between 11.0 and 20.0 cal/cm3, which suppresses swelling and destruction caused by the electrolytic solution, maintaining insulation and laminating strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If the sealant layer is thinned to reduce weight and cost, then weight and manufacturing cost are reduced, but insulation properties and laminating strength decrease
Solution Approach 1:
The patent applies composite materials by combining polyolefin-based resin with silane-modified components to create a multi-functional sealant layer that achieves both thinness and high insulation properties. The silane-modified polyolefin resin provides enhanced electrical insulation while maintaining mechanical strength, allowing the sealant layer to be thinner without compromising reliability.
Solution Approach 2:
The patent changes the chemical parameters of the sealant layer by introducing silane-modified polyolefin resin with specific molecular structure and crosslinking characteristics. This parameter change enables the material to maintain high insulation properties at reduced thickness, resolving the contradiction between thinness and reliability.
2Ease of manufacture
If the sealant layer is thinned, then manufacturing cost is reduced, but heat seal strength decreases
Solution Approach 1:
The patent uses composite materials combining polyolefin-based resin with silane-modified components to create a sealant layer that achieves both cost-effectiveness and high heat seal strength. The composite structure provides enhanced bonding capability and thermal properties, allowing thin-layer sealing with maintained strength.
Solution Approach 2:
The patent modifies the thermal and chemical parameters of the sealant layer through silane modification, enabling the material to achieve high heat seal strength at reduced thickness. The crosslinking characteristics and molecular structure changes allow effective sealing performance in thinner layers, reducing manufacturing cost while maintaining strength.
3Ease of manufacture
If conventional sealant layers are used, then manufacturing is simple, but insulation properties decrease due to destruction during degassing heat sealing
Solution Approach 1:
The patent applies preliminary action by pre-modifying the polyolefin resin with silane groups before the heat sealing process. This preliminary modification creates crosslinking structures that enhance the sealant layer's resistance to destruction during degassing heat sealing, maintaining insulation properties without complicating the manufacturing process.
Solution Approach 2:
The patent changes the chemical structure parameters of the sealant layer by introducing silane-modified polyolefin resin that undergoes controlled crosslinking. This parameter change enhances the material's stability during heat sealing, preventing destruction and maintaining insulation properties while keeping manufacturing relatively simple.
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 packaging material effectively prevents the decrease in insulation properties after degassing heat sealing without compromising the fundamental performance, ensuring sustained laminating and heat seal strengths.
Implementation Method 1
an additive compound with an SP value of 11.0 (cal/cm3)1/2 or more and 20.0 (cal/cm3)1/2 or less
Implementation Method 2
an adhesive layer or an adhesive resin layer
Implementation Method 3
a metallic foil layer with an anti-corrosion treatment layer being disposed on one face or both faces thereof
Data Source
AI summary
A packaging material for a power storage device, having a structure in which at least a substrate layer, a metallic foil layer with an anti-corrosion treatment layer being disposed on one face or both faces thereof, an adhesive layer or an adhesive resin layer, and a sealant layer are laminated in this order, wherein at least one layer of the adhesive resin layer and the sealant layer comprises a polyolefin-based resin, and an additive compound with an SP value of 11.0 (cal/cm3)1/2 or more and 20.0 (cal/cm3)1/2 or less.