Battery Packaging Material Composition for Formability Without White Powder
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Solution Overview
Problem
Existing packaging materials for lithium-ion batteries face challenges in achieving good formability without excessive deposition of fatty acid amide, which leads to white powder adhesion on the molding surface, reducing productivity and stability of the molding process.
Innovation Solution
A molding packaging material comprising a substrate layer, a heat fusible resin layer with an innermost layer containing a resin composition of heat fusible resin, anti-blocking agent, slip agent, and fluoropolymer-based lubricant, and a metal foil layer between the substrate and the heat fusible resin layer, where the fluoropolymer-based lubricant is used to improve slipperiness and prevent white powder adhesion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a sufficient amount of fatty acid amide is added to ensure good formability, then the slipperiness of the surface is improved, but the fatty acid amide is excessively deposited on the surface, causing white powder adhesion on the molding surface
Solution Approach 1:
The invention changes the chemical composition parameters of the inner sealant layer by incorporating specific components (polyester resin with specific functional groups, polyolefin resin, and controlled fatty acid amide content at 0.01-5 mass%). This parameter optimization allows achieving good formability while minimizing white powder adhesion by balancing the slipperiness enhancement with reduced excessive deposition.
Solution Approach 2:
The invention uses a composite material system in the inner sealant layer combining polyester resin, polyolefin resin, and fatty acid amide. This composite structure leverages the synergistic effects of different materials: polyester resin provides adhesion and structural integrity, polyolefin resin contributes to slipperiness, and fatty acid amide enhances formability while being controlled to prevent excessive white powder formation.
2Manufacturing precision
If various adjustments are made for the additive amount of fatty acid amide, the aging temperature, and the aging time, then the formability can be optimized, but the bleed amount of the fatty acid amide to the surface is likely to vary, making it difficult to ensure stable quality
Solution Approach 1:
The invention establishes specific parameter ranges for fatty acid amide content (0.01-5 mass%) and defines controlled aging conditions. By optimizing these parameters within defined ranges, the invention achieves consistent formability while stabilizing the bleed amount of fatty acid amide to the surface, thereby ensuring stable quality across production batches.
Solution Approach 2:
The invention implements a controlled formulation approach where the composition of the inner sealant layer is precisely designed with specific resin types and fatty acid amide content. This feedback-controlled composition ensures that the material consistently achieves the desired formability and surface properties, reducing variation in quality.
3Object-generated harmful factors
If the additive amount of fatty acid amide is reduced to suppress the adhesive deposition of white powder, then the white powder adhesion is reduced, but the amount of fatty acid amide deposited on the surface becomes insufficient, resulting in poor formability
Solution Approach 1:
The invention optimizes the fatty acid amide content within a specific range (0.01-5 mass%) rather than simply reducing it. This parameter optimization ensures sufficient surface deposition for good formability while preventing excessive deposition that causes white powder adhesion. The balanced composition achieves both goals simultaneously.
Solution Approach 2:
The invention uses a composite material system where polyester resin, polyolefin resin, and fatty acid amide work synergistically. The polyolefin resin contributes to slipperiness, allowing reduced fatty acid amide content while maintaining formability. This composite approach enables achieving good formability with minimal white powder adhesion.
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 slipperiness of the packaging material, improving moldability during deep-drawing forming and stretch forming, while minimizing the occurrence of white powder on the surface, thus ensuring stable and efficient production.
Implementation Method 1
an innermost layer of the heat fusible resin layer is made of a resin composition containing a heat fusible resin, an anti-blocking agent, a slip agent, and a fluoropolymer-based lubricant
Implementation Method 2
a heat fusible resin layer as an inner layer
Data Source
AI summary
A molding packaging material is capable of ensuring good slipperiness to secure good formability when molding the molding packaging material and is less likely to cause white powder on a surface of the packaging material. The molding packaging material includes a substrate layer as an outer layer, a heat fusible resin layer as an inner layer, and a metal foil layer arranged between the two layers. The heat fusible resin layer is composed of a single layer or a multi-layer. The innermost layer of the heat fusible resin layer is made of a resin composition containing a heat fusible resin, an anti-blocking agent, a slip agent, and a fluoropolymer-based lubricant.