Battery Cladding Laminate Adhesive for High-Temperature Sealing
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Solution Overview
Problem
Laminated fully solid-state batteries face issues with adhesion between layers in high temperature environments due to insufficient heat resistance of packaging materials, leading to deterioration in lamination strength and sealing performance.
Innovation Solution
A power storage device packaging material comprising a laminate with a substrate layer, a barrier layer, and a sealant layer, where an adhesive layer containing a polyurethane-based compound made from a reaction product of polyester polyol resin and polyfunctional isocyanate, specifically isophorone diisocyanate, provides excellent lamination strength and deep drawing formability in both room and high temperature environments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If epoxy adhesive is used to provide heat resistance, then adhesion at high temperature is improved, but lamination strength and formability at room temperature deteriorate due to brittleness
Solution Approach 1:
The patent changes the chemical composition parameters of the adhesive by specifying a polyurethane-based compound made from polyester polyol and polyfunctional isocyanate with specific functional groups (carboxyl, hydroxyl, or amine groups). This parameter change enables the adhesive to achieve both heat resistance and flexibility, resolving the contradiction between high-temperature adhesion and room-temperature lamination strength.
Solution Approach 2:
The adhesive is formulated as a composite material combining polyester polyol with polyfunctional isocyanate and additional functional components (carboxyl, hydroxyl, or amine groups). This composite structure provides both the thermal stability needed for high-temperature resistance and the molecular flexibility required for strong lamination and formability at room temperature.
2Ease of manufacture
If conventional adhesive is used for lamination, then manufacturing is simple, but adhesion deteriorates in high temperature environment leading to delamination
Solution Approach 1:
The patent modifies the adhesive composition by incorporating polyfunctional isocyanate with specific functional groups that enhance thermal stability. This parameter change maintains the ease of application and manufacturing while significantly improving adhesion stability at high temperatures, preventing delamination.
3Ease of manufacture
If packaging material lacks heat resistance, then manufacturing and processing are easier, but lamination strength deteriorates at high temperature
Solution Approach 1:
The packaging material's adhesive layer uses a polyurethane-based compound with specific chemical parameters (polyester polyol + polyfunctional isocyanate + functional groups) that provide heat resistance. This enables the material to maintain lamination strength at high temperatures while remaining easy to process during manufacturing.
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 achieves enhanced lamination strength and deep drawing formability, maintaining performance even at elevated temperatures, and prevents delamination and corrosion, ensuring reliable sealing and durability.
Implementation Method 1
an adhesive layer interposed between the substrate layer and the barrier layer, the adhesive layer containing a polyurethane-based compound made of a reaction product of at least one polyester polyol resin and at least one polyfunctional isocyanate compound
Data Source
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AI summary
A power storage device packaging material according to the present disclosure includes: a laminate at least including a substrate layer, a barrier layer, and a sealant layer, which are disposed in this order; and an adhesive layer interposed between the substrate layer and the barrier layer, the adhesive layer containing a polyurethane-based compound made of a reaction product of at least one polyester polyol resin and at least one polyfunctional isocyanate compound, wherein the polyfunctional isocyanate compound contains an isocyanurate of isophorone diisocyanate, and a content of isocyanate groups derived from the isocyanurate of isophorone diisocyanate in the polyfunctional isocyanate compound is 5 mol% to 100 mol% relative to a total amount of isocyanate groups contained in the polyfunctional isocyanate compound of 100 mol%.