Power Storage Casing Laminate Hardness Under Press Pressure
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Solution Overview
Problem
Conventional power storage device outer packaging materials fail to maintain insulation quality when subjected to press pressure, leading to potential cracks and deterioration.
Innovation Solution
A power storage device outer packaging material comprising a laminate structure with a base material layer, a barrier layer, and a heat-sealable resin layer, where the resin layer has a hardness of 70 MPa or more, ensuring high insulation quality even under pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a pressing pressure is applied to improve adhesion between active material and electrode, then adhesion is improved, but cracks or deterioration occur in the heat-sealable resin layer leading to insulation quality deterioration
Solution Approach 1:
The patent changes the physical parameter of the heat-sealable resin layer by specifying a hardness of 70 MPa or more, measured under specific conditions (cross-section measurement, 100 μN load, nanoindentation method). This parameter change enables the resin layer to maintain its structural integrity and insulation quality while still allowing sufficient adhesion improvement under pressing pressure.
Solution Approach 2:
The patent employs a laminate structure comprising multiple layers including a base material layer, an intermediate layer, and a heat-sealable resin layer. This composite structure combines materials with different properties to achieve both good adhesion and maintained insulation quality under pressing pressure, with the heat-sealable resin layer specifically engineered to resist cracking.
2Strength
If metallic outer packaging materials are used, then structural strength is maintained, but weight reduction and shape diversification are limited
Solution Approach 1:
The patent transitions from metallic materials to polymer-based laminate materials, changing the fundamental material parameter. The specific specification of heat-sealable resin layer hardness (70 MPa or more) ensures that this non-metallic material maintains sufficient structural strength and resistance to pressing pressure while achieving weight reduction.
Solution Approach 2:
The patent uses a composite laminate structure with multiple functional layers (base material layer, intermediate layer, heat-sealable resin layer) to replace metallic packaging. This composite material approach provides both the necessary mechanical strength and the weight reduction benefits, while also enabling shape diversification that metallic materials cannot achieve.
3Ease of manufacture
If heat-sealable resin layers are made softer to improve sealing, then sealing performance is improved, but insulation quality deteriorates under press pressure
Solution Approach 1:
The patent identifies and controls the critical parameter of heat-sealable resin layer hardness, specifying it should be 70 MPa or more. This parameter optimization balances sealing performance (which requires some softness) with insulation quality under pressure (which requires sufficient hardness to prevent cracking). The measurement conditions are precisely defined to ensure consistent results.
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 maintains high insulation quality and integrity of the packaging material under press pressure, preventing cracks and ensuring the performance of the power storage device.
Implementation Method 1
the heat-sealable resin layer includes at least one layer having a hardness of 70 MPa or more as measured from a cross-section in a lamination direction of the laminate under a load of indentation of 100 μN in a nanoindentation method
Data Source
AI summary
A casing material for a power storage device, including a laminate that includes, in order, at least a base material layer, a barrier layer, and a heat-fusible resin layer. The heat-fusible resin layer includes a single layer or a plurality of layers. The heat-fusible resin layer includes at least one layer having a hardness of at least 70 MPa from a cross-section in the lamination direction of the laminate, measured using a nanoindentation method using an indentation load of 100 μN.