Battery Packaging Material Discrimination Layer Design
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Solution Overview
Problem
Battery packaging materials face issues with discriminability, moldability, insulation quality, external appearance defects, and seal defects due to the detachment of pigments and deterioration of adhesiveness, as well as compromised electrolytic solution resistance and post-molding adhesion when using solid particles in discrimination layers.
Innovation Solution
A battery packaging material with a laminate structure including a base material layer, an adhesive layer, and a metal layer, where at least one of the base material or adhesive layers contains a dye for discriminability, and a decorative layer with a high resin content for designability and electrolytic solution resistance, effectively reducing defects and improving insulation quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a pigment is incorporated in a resin to form a discrimination mark, then discriminability is improved, but the pigment detaches during molding causing pinholes and deteriorating insulation quality
Solution Approach 1:
The patent extracts the harmful solid pigment particles from the base material layer and relocates them to a dedicated discrimination layer. This separation prevents the pigment from interfering with the base material's molding process and insulation properties, while still achieving discriminability through the concentrated pigment in the discrimination layer.
Solution Approach 2:
The patent introduces an adhesive layer as an intermediary between the base material layer and the discrimination layer containing pigment particles. This adhesive layer binds the pigment-containing discrimination layer to the base material without requiring the pigment to be incorporated into the base material itself, thus preventing pigment detachment and pinhole formation while maintaining discriminability.
2Reliability
If solid pigment particles are used in the adhesive layer, then discriminability is improved, but adhesiveness deteriorates causing delamination
Solution Approach 1:
The patent extracts solid pigment particles from the adhesive layer and concentrates them in a separate discrimination layer. This removal eliminates the interference of solid particles with the adhesive bonding function, preventing delamination while preserving discriminability through the dedicated discrimination layer.
Solution Approach 2:
The patent uses an adhesive layer as a mediator that provides bonding strength without containing solid pigment particles. The discrimination layer with pigment particles is bonded to this clean adhesive layer, allowing the adhesive to perform its function without interference from solid particles, thus preventing delamination.
3Adaptability or versatility
If pigment is added to achieve discriminability, then designability is improved, but external appearance defects occur due to pigment floating and color tone deterioration
Solution Approach 1:
The patent extracts pigment particles from the base material layer and concentrates them in a separate discrimination layer. This separation prevents pigment particles from floating during molding and causing color tone deterioration, while still achieving designability and discriminability through the dedicated discrimination layer with controlled pigment concentration.
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 provides a battery packaging material with enhanced discriminability, moldability, insulation quality, reduced external appearance and seal defects, and improved electrolytic solution resistance and adhesion, making it difficult to forge and ensuring effective sealing and protection.
Implementation Method 1
at least one of the base material layer and the adhesive layer contains a dye
Implementation Method 2
a packaging material is an essential member for sealing battery elements
Implementation Method 3
a battery element can be sealed by heat-welding the peripheral edge of the sealant layers by heat sealing with the sealant layers facing each other
Data Source
AI summary
A battery packaging material of a first aspect identifiable from the outside has exceptional moldability, insulating properties, and reduced external appearance defects and seal defects. A battery packaging material of the second aspect identifiable has post-molding concealment and adhesion properties, exceptional electrolyte resistance and surface insulating properties. The battery packaging material of the first aspect includes a laminate of at least a base material, adhesive, metal and sealant layers sequentially laminated, at least one of the base material and adhesive layers includes a dye. The battery packaging material of the second aspect includes a laminate of at least a decorative, base material, metal and sealant layers sequentially laminated; the decorative layer has at least a first and second decorative layers from the base material layer side. The decorative layer includes coloring and matting agents. The resin ratio is at least 60% by mass for the first and second decorative layers.