Power Storage Packaging Laminate With IR-Tuned Adhesion Stability
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Laminated solid-state batteries face insufficient sealing performance due to delamination between layers of packaging materials, primarily due to inadequate heat resistance, and damage during deep recess formation in the production process.
Innovation Solution
A packaging material with a laminate structure comprising a substrate layer, first and second adhesive layers containing urethane or urea compounds, and a sealant layer, where the adhesive layers' infrared absorption spectrum peak intensities satisfy specific ratios, enhancing heat resistance and deep drawability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If conventional adhesive layers are used in packaging material for solid-state batteries, then the packaging material can be manufactured with standard processes, but delamination occurs between layers due to insufficient heat resistance at high temperatures
Solution Approach 1:
The adhesive layer uses a copolymer composition with specific ratios of crystalline phase-forming units (20-80 mol%) and amorphous phase-forming units (20-80 mol%), enabling the material to maintain appropriate hardness and adhesion across a wide temperature range from low to high temperatures, thus preventing delamination at high operating temperatures
Solution Approach 2:
The adhesive layer is formulated as a copolymer composite combining crystalline phase-forming units (providing high-temperature structural stability) and amorphous phase-forming units (providing low-temperature flexibility and adhesion), creating a material that maintains reliable sealing performance across extreme temperature variations
2Shape
If deep recesses are formed in packaging material during battery production, then battery contents can be properly accommodated, but damage occurs to the packaging material structure
Solution Approach 1:
The packaging material utilizes the copolymer's ability to adjust its mechanical properties with temperature: at processing temperature the material becomes sufficiently soft and pliable to form deep recesses without damage, while at service temperature it maintains adequate hardness and structural integrity to support the battery contents
Solution Approach 2:
The packaging material exhibits dynamic mechanical properties that change with temperature, being soft and formable during the manufacturing process at elevated temperatures, then transitioning to a rigid, structurally sound state at lower operating temperatures to maintain strength during deep recess formation and service
3Temperature
If adhesive layers with high heat resistance are used, then delamination is prevented, but initial adhesion and bonding strength may be compromised
Solution Approach 1:
The copolymer adhesive layer exploits temperature-dependent phase behavior: at room temperature the amorphous phase provides softness and strong initial adhesion, while at high temperatures the crystalline phase provides structural stability and prevents delamination, thus achieving both high initial adhesion and heat resistance simultaneously
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 improved heat resistance, deep drawability, and initial adhesion, preventing delamination and damage during high-temperature use and forming processes.
Implementation Method 1
at least one of the first adhesive layer and the second adhesive layer contains a urethane compound or a urea compound
Implementation Method 2
when a peak intensity of infrared absorption spectrum at 1,700 to 1,800 cm−1 measured using infrared spectroscopy is represented by A, and a peak intensity of infrared absorption spectrum at 1,600 to 1,660 cm−1 measured using infrared spectroscopy is represented by B
Data Source
AI summary
A packaging material for a power storage device, including a laminate structure of a substrate layer, a first adhesive layer, a barrier layer, a second adhesive layer, and a sealant layer, in this order, wherein at least one of the first adhesive layer and the second adhesive layer contains a urethane compound or a urea compound; the urethane compound is a polyol resin with a polyfunctional isocyanate compound; the urea compound is a polyfunctional isocyanate compound an amine compound or an amine derivative; and, when a peak intensity of infrared absorption spectrum at 1,700 to 1,800 cm−1 measured using infrared spectroscopy (A”), and a peak intensity of infrared absorption spectrum at 1,600 to 1,660 cm−1 measured using infrared spectroscopy (“B”), a value X that is defined by the following Formula (1), which is X={B/(A+B)×100, satisfies a relationship 0.1≤X≤7.0.