Power Storage Casing Laminate for Crush-Resistant Heat Sealing
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Solution Overview
Problem
The existing power storage device outer packaging materials face challenges in maintaining insulation quality due to crushing of the heat-sealable resin layer during the high-temperature and high-pressure heat-sealing process.
Innovation Solution
A laminate structure comprising a base material layer, a barrier layer, and a heat-sealable resin layer, where the first heat-sealable resin layer on the surface has a logarithmic decrement of 0.20 or less at 140°C in a rigid pendulum measurement, 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 power storage device outer packaging material, then the sealing function is improved, 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 optimization allows the resin layer to withstand heat-sealing temperatures and pressures without crushing, thereby maintaining insulation quality while achieving reliable sealing
Solution Approach 2:
The patent uses a laminate structure comprising multiple layers including a base material layer, barrier layer, and heat-sealable resin layer. This composite structure combines materials with different properties to achieve both effective heat-sealing and maintenance of insulation quality
2Strength
If metallic outer packaging materials are used, then structural strength is improved, but weight reduction and shape diversification are limited
Solution Approach 1:
The patent transitions from metallic materials to film-shaped laminate materials, changing the material parameters to achieve lighter weight while maintaining sufficient structural strength through the optimized laminate structure and heat-sealable resin layer
Solution Approach 2:
The patent employs a film-shaped laminate structure that can be formed into diversified shapes more easily than rigid metallic materials, enabling both weight reduction and shape diversification while maintaining necessary structural integrity
3Weight of moving object
If the heat-sealable resin layer is made thinner for weight reduction, then weight is reduced, but the layer becomes more susceptible to crushing during heat-sealing
Solution Approach 1:
The patent optimizes the logarithmic decrement parameter of the heat-sealable resin layer to 0.20 or less at 140°C, which allows the layer to maintain high resistance to crushing even at reduced thickness, enabling weight reduction without sacrificing reliability
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 proposed solution enhances the insulation quality of the power storage device outer packaging material by preventing crushing of the heat-sealable resin layer, thereby maintaining the integrity and performance of the packaging.
Implementation Method 1
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.