Battery Casing Laminate for Crush-Resistant Heat Sealing
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Solution Overview
Problem
Metallic power storage device outer packaging materials face challenges in shaping diversity and weight reduction, and heat-sealing processes can crush the heat-sealable resin layer, deteriorating insulation quality.
Innovation Solution
A power storage device outer packaging material with a laminate structure comprising a base material layer, a barrier layer, and a heat-sealable resin layer, where the heat-sealable resin layer has a logarithmic decrement of 0.20 or less at 140°C, effectively suppressing crushing during heat-sealing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high temperature and high pressure are applied to heat-seal the heat-sealable resin layer, then sealing is achieved, but the heat-sealable resin layer is crushed and insulation quality deteriorates
Solution Approach 1:
The patent changes the physical parameters of the heat-sealable resin layer by controlling its logarithmic decrement to 0.20 or less at 140°C. This parameter control allows the resin to maintain appropriate softness for sealing while preventing excessive deformation and crushing under heat-sealing conditions, thus resolving the contradiction between sealing quality and insulation quality
Solution Approach 2:
The patent uses a laminate structure comprising a base material layer, a barrier layer, and a heat-sealable resin layer. This composite structure allows each layer to perform its specific function: the base material provides structural support, the barrier layer maintains insulation properties, and the heat-sealable resin layer provides sealing capability with controlled deformation characteristics
2Strength
If metallic outer packaging materials are used, then strength and durability are improved, but shaping diversity and weight reduction are limited
Solution Approach 1:
The patent replaces rigid metallic packaging with a flexible laminate structure consisting of thin film layers. This flexible structure can be easily formed into diverse shapes through molding while maintaining adequate strength and providing weight reduction, thus resolving the contradiction between packaging strength and shaping diversity
Solution Approach 2:
The patent employs a composite laminate structure combining different material layers (base material layer, barrier layer, heat-sealable resin layer) to achieve the desired balance between strength, flexibility, and formability that cannot be obtained with single metallic materials
3Strength
If metallic outer packaging materials are used, then structural integrity is maintained, but weight reduction is limited
Solution Approach 1:
The patent uses thin film laminate structure to replace heavy metallic packaging. The multiple thin layers provide the necessary structural integrity through their composite architecture while significantly reducing the overall weight of the packaging material
Solution Approach 2:
The patent creates a lightweight composite laminate structure where each thin layer contributes specific properties. The combination of base material, barrier layer, and heat-sealable resin provides structural integrity equivalent to metal while achieving substantial weight reduction
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 enhances insulation quality by preventing resin layer crushing, enabling improved processing and reduced thickness and weight in power storage devices.
Implementation Method 1
a heat-sealable resin layer is heat-sealed by applying a high temperature and a high pressure to a power storage device outer packaging material
Implementation Method 2
application of a high temperature and a high pressure to the power storage device outer packaging material crushes the heat-sealable resin layer located on the surface
Implementation Method 3
a first heat-sealable resin layer of the heat-sealable resin layer, which forms a surface of the laminate, has a logarithmic decrement ΔE of 0.20 or less at 140° C. in a rigid pendulum measurement
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. A first heat-fusible resin layer, among the heat-fusible resin layers, that constitutes the surface of the laminate has a logarithmic decrement ΔE of no more than 0.20 in a rigid body pendulum measurement at 140° C.