Battery Outer Package Laminate for High-Temperature Insulation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing exterior materials for all-solid-state batteries face challenges in maintaining high insulation quality and followability to volume expansion and contraction of the solid electrolyte, particularly at high temperatures, due to the use of polyolefin-based heat-sealable resin layers.
Innovation Solution
The exterior material for all-solid-state batteries is designed with a laminate structure comprising a base material layer, a barrier layer, and a heat-sealable resin layer formed from a polybutylene terephthalate film containing an elastomer, which enhances insulation quality and followability to the electrolyte's expansion and contraction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a heat-sealable resin layer is formed of polyolefin for easy processing and cost-effectiveness, then manufacturing ease is improved, but insulation quality deteriorates in high-temperature environments
Solution Approach 1:
The patent applies composite materials by combining polybutylene terephthalate (a thermoplastic polyester) with elastomers to create a heat-sealable resin layer that achieves both processability and high-temperature insulation performance. This composite approach allows the material to exhibit both the ease of processing needed for manufacturing and the insulation quality required for high-temperature reliability.
Solution Approach 2:
The patent changes the material parameters by selecting polybutylene terephthalate instead of conventional polyolefin, and by controlling the elastomer content within specific ranges (5-50 parts by mass per 100 parts of polybutylene terephthalate). These parameter changes enable the heat-sealable resin layer to maintain insulation quality at high temperatures while remaining processable.
2Strength
If the exterior material is made rigid for structural stability, then strength is improved, but followability to volume expansion and contraction of solid electrolyte deteriorates
Solution Approach 1:
The patent uses composite materials consisting of polybutylene terephthalate combined with elastomers (such as polyether blocks, polyester blocks, or polyamide blocks) in specific ratios. This composite structure provides both the structural stability needed for strength and the flexibility required to follow the volume expansion and contraction of the solid electrolyte during charge-discharge cycles.
Solution Approach 2:
The patent applies dynamics by incorporating elastomeric components that enable the heat-sealable resin layer to dynamically adapt its shape in response to the solid electrolyte's volume changes during operation. The elastomer content and type are carefully selected to provide appropriate dynamic response while maintaining structural integrity.
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 laminate structure provides excellent insulation quality and flexibility in high-temperature environments, ensuring durability and effective packaging of all-solid-state batteries during charge-discharge cycles.
Implementation Method 1
a heat-sealable resin layer formed of a polybutylene terephthalate film containing an elastomer
Implementation Method 2
the exterior material has excellent insulation quality in a high-temperature environment
Data Source
AI summary
A outer package material for all-solid-state batteries, said outer package material being composed of a multilayer body that is sequentially provided, from the outer side, with at least a base material layer, a barrier layer and a thermally fusible resin layer in this order, while exhibiting excellent insulating performance in a high temperature environment and excellent followability to the expansion and contraction of a solid electrolyte during charging and discharging of an all-solid-state battery. An outer package material for all-solid-state batteries, said outer package material being composed of a multilayer body that is sequentially provided, from the outer side, with at least a base material layer, a barrier layer and a thermally fusible resin layer in this order, wherein the thermally fusible resin layer is formed of a polybutylene terephthalate film that contains an elastomer.