Outer Package Material for Solid-State Batteries
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Solution Overview
Problem
Laminated fully solid-state batteries face issues with heat seal strength under high temperature conditions due to insufficient heat resistance of packaging materials, leading to reduced adhesion and sealability, and heat seal strength is compromised when temperature returns to room conditions after high temperature exposure.
Innovation Solution
A packaging material comprising a substrate layer, a barrier layer, and a sealant layer with specific components such as polyolefin units, polyethylene resin, and polypropylene resin, along with a compatibilizer, to achieve high heat seal strength under both high temperature and room temperature conditions, and includes an anticorrosion treatment layer and hydrogen sulfide adsorbent for enhanced protection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a resin composition containing a carboxyl group-containing polymer and a hydroxyl group-containing polymer is used as outer package material, then heat resistance and affinity with aluminum foil are improved, but the complexity of material selection and formulation increases
Solution Approach 1:
The patent uses composite materials by combining carboxyl group-containing polymer and hydroxyl group-containing polymer in specific weight ratios (30-70 wt% each) to achieve both heat resistance and good affinity with aluminum foil. The composite polymer system provides synergistic effects that single polymers cannot achieve alone.
Solution Approach 2:
The patent specifies precise parameter ranges for the polymer composition, including weight ratios of 30-70 wt% for each polymer type, and molecular weight ranges (10,000-1,000,000). By controlling these parameters within specific ranges, the material achieves optimal heat resistance while maintaining manufacturability.
2Reliability
If the outer package material has high heat resistance and good sealability, then reliability of the electricity storage device is improved, but the ease of manufacture decreases due to restricted material selection
Solution Approach 1:
The patent applies local quality by providing different functional properties to different components of the outer package. The resin composition specifically targets the seal portion to provide enhanced heat resistance and sealability, while the overall structure maintains manufacturing flexibility through controlled parameter ranges rather than absolute restrictions.
3Ease of manufacture
If conventional resin compositions are used without specific polymer combinations, then ease of manufacture is maintained, but sealing performance at heat seal portions deteriorates
Solution Approach 1:
The patent applies preliminary action by pre-formulating the resin composition with specific carboxyl and hydroxyl group-containing polymers before the sealing process. This pre-prepared composition ensures that when heat sealing is performed, the material already has the necessary affinity and adhesion properties, eliminating the need for complex adjustments during manufacturing while achieving reliable sealing.
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 solution ensures high heat seal strength and adhesion under high temperature conditions while maintaining strength at room temperature, and provides protection against hydrogen sulfide, effectively addressing the sealability and stability issues of fully solid-state batteries.
Implementation Method 1
a resin composition comprising a carboxyl group-containing polymer and a hydroxyl group-containing polymer
Implementation Method 2
heat resistance has been improved, affinity with an aluminum foil laminate used as a barrier layer has been enhanced, and sealability has been excellent
Data Source
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AI summary
A packaging material for a power storage device and a power storage device using the same, a method of producing a packaging material for a power storage device, and a method of selecting a sealant film used as a sealant layer in the packaging material for a power storage device are provided.