Colored Multi-Layer Battery Packing Case Defect Detection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
It is difficult to identify external defects in lithium secondary battery electrode assemblies due to the complexity of the packing case structure, which includes a positive electrode, negative electrode, and separator rolled or stacked with an electrolyte.
Innovation Solution
A packing case for a battery is designed with multiple layers, including an inside layer, a metal layer, and an outside layer with colored sub-layers that have complementary colors or different materials, allowing for easier detection of defects through color differences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a multi-layer packing case structure is used for battery containment, then structural integrity and protection are improved, but defect detection difficulty increases due to layer complexity
Solution Approach 1:
The patent applies color coding to different layers of the packing case structure. The inside layer, metal layer, and outside layer are each assigned distinct colors or color patterns, enabling visual defect detection through color contrast. This resolves the contradiction by maintaining the multi-layer protective structure while making defects visible through color differentiation rather than removing protective layers.
Solution Approach 2:
The patent implements localized color identification features on specific layers. Each layer (inside layer, metal layer, outside layer) has distinctive color characteristics that allow localized defect detection. This enables quality control while preserving the complete multi-layer structure for structural integrity.
2Measurement precision
If multiple colored layers with different materials are used in the outside layer, then defect identification capability is improved, but manufacturing complexity increases
Solution Approach 1:
The patent uses color-coded layers where each layer (inside layer, metal layer, outside layer) has distinct color characteristics. This enables defect identification through visual color contrast while maintaining a manageable manufacturing process. The color differentiation provides precise defect identification without requiring complex multi-material construction, as the same or similar materials can be used with different color treatments.
Data Source
AI summary
A packing case for a battery including an inside layer, an outside layer, and a metal layer formed between the inside and outside layers, wherein the outside layer comprises at least one sub-layer having a color different than a color of the metal layer; and a secondary battery including the packing case; and a method of manufacturing the secondary battery.