Battery Packaging Material With Tuned Layer Stiffness for Pressure Stability
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Solution Overview
Problem
All-solid-state batteries are prone to excessive deformation under high temperature conditions due to pressure application, leading to insufficient output, as conventional packaging materials fail to uniformly distribute pressure and maintain structural integrity.
Innovation Solution
A power storage device packaging material with specific loop stiffness and thickness ratios for its layers, including a substrate, barrier, and sealant layers, composed of polypropylene resin and additives, to prevent excessive deformation under high temperature conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If pressure is applied to the power storage element via the packaging bag to achieve higher output, then the output of the all-solid-state battery is improved, but the packaging bag undergoes excessive deformation leading to failure of uniform pressure application
Solution Approach 1:
The patent applies parameter changes by controlling the loop stiffness values of different layers within specific ranges (sealant/adhesive layer: 10-80 mN, substrate layer: 2-20 mN) and maintaining their ratios within defined boundaries. This optimization of mechanical parameters enables the packaging material to apply pressure uniformly without excessive deformation, resolving the contradiction between achieving high output and preventing packaging bag deformation.
Solution Approach 2:
The patent uses a composite multilayer structure consisting of a substrate layer, barrier layer, thermal adhesive resin layer or adhesive layer, and sealant layer. Each layer contributes different properties (mechanical strength, barrier performance, adhesion, sealing) and their coordinated loop stiffness values create a synergistic effect that prevents excessive deformation while enabling uniform pressure application to achieve higher battery output.
2Power
If pressure is applied by a packaging bag under high temperature environmental conditions to achieve higher output, then the output may be improved, but deformation of the packaging bag is more likely to occur
Solution Approach 1:
The patent addresses high temperature reliability by optimizing the loop stiffness parameters of each layer. The controlled loop stiffness values and their ratios ensure that the packaging material maintains its mechanical properties and structural integrity under high temperature conditions (70°C or higher), preventing excessive deformation while enabling uniform pressure application for improved battery output.
Solution Approach 2:
The multilayer composite structure provides enhanced thermal and mechanical stability. The combination of layers with specifically controlled loop stiffness values creates a synergistic system that resists deformation under high temperature environmental conditions, ensuring reliable pressure application and maintaining structural integrity throughout the battery's operational temperature range.
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 effectively prevents excessive deformation, ensuring uniform pressure distribution and maintaining structural integrity of all-solid-state batteries under high temperature conditions, thereby enhancing their output performance.
Implementation Method 1
a loop stiffness value of the layer or layers (I) is 10 mN or more and 80 mN or less, a loop stiffness value of the layer (II) is 2 mN or more and 20 mN or less
Implementation Method 2
the possible temperature range of all-solid-state batteries is, for example, −40° C. or higher and 100° C. or lower... under high temperature environmental conditions (e.g., 70° C. or higher)
Data Source
AI summary
A power storage device packaging material including a substrate layer, a barrier layer, a thermal adhesive resin layer or an adhesive layer, and a sealant layer that are laminated in this order, wherein in a case where (I) represents the sealant layer or the thermal adhesive resin layer and the sealant layer and (II) represents the substrate layer, a loop stiffness value of (I) is 10 mN or more and 80 mN or less, a loop stiffness value of (II) is 2 mN or more and 20 mN or less, a ratio (I/II) between the loop stiffness value of (I) and the loop stiffness value of (II) is 1.0 or more and 15 or less, and a ratio (I/II) between a thickness of (I) and a thickness of (II) is 1.0 or more and 8.0 or less.