Battery Packaging Laminate for Contaminant-Resistant Insulation
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Solution Overview
Problem
Conventional battery packaging materials face challenges in maintaining insulation quality due to the presence of small contaminants like electrode debris, which can lead to electrical shorts and reduced insulation performance, especially during the heat-sealing process.
Innovation Solution
A laminated battery packaging material structure comprising a base material layer, a metal layer, an insulating layer, and a sealant layer, where the insulating layer is made of a modified polyolefin resin with specific hardness and composition to prevent contamination and ensure high insulation quality, even when contaminants are present.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If heat and pressure are applied during heat-sealing, then sealing quality is improved, but contaminants penetrate the sealant layer causing short circuits
Solution Approach 1:
The insulating layer is positioned in advance between the metal layer and sealant layer before heat-sealing occurs. This preliminary placement ensures that when heat and pressure are applied during sealing, the insulating layer is already in position to prevent contaminant penetration, maintaining insulation quality while achieving proper sealing.
Solution Approach 2:
The insulating layer acts as a protective cushion placed beforehand to prevent the harmful effect of contaminant penetration. During heat-sealing, this pre-positioned layer absorbs and redirects the pressure, preventing contaminants from penetrating through to cause short circuits while still allowing effective sealing.
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 solution effectively improves the insulation quality and durability of the battery packaging material by preventing contaminants from causing electrical shorts and maintaining performance even when debris is present, thus enhancing the reliability of the battery.
Implementation Method 1
the insulating layer has heat resistance to a melting point of the sealant layer, and has flexibility
Implementation Method 2
the part where the contaminants adhere in the sealant layer can be thinned by the heat and the pressure at the time of heat-sealing
Implementation Method 3
an insulating layer, and a sealant layer laminated in this order... having high insulation quality
Implementation Method 4
the heat and the pressure at the time of heat-sealing a battery element with a battery packaging material
Data Source
Figure 1~3
Figure 4
AI summary
[Problem] To provide a highly insulative power-cell packaging material. [Solution] A power-cell packaging material comprising a layered body obtained by layering at least a substrate layer, a metal layer, an insulating layer, and a sealant layer, in this order. The insulating layer has a hardness in the range of 10-300 MPa, when measured by using a nanoindenter and pressing the indenter 5µm into the insulating layer from a cross-section of the layered body in the layering direction thereof.