Composite Bi-Cell Lamination for Wrinkle-Free Jelly Roll Stacking
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Solution Overview
Problem
Current laminating processes for lithium-ion battery jelly rolls have low efficiency and poor quality due to high-speed movement of separators, leading to wrinkles, lithium precipitation, and inconsistent deformation of electrodes.
Innovation Solution
A laminating equipment with a transferring mechanism and a carrying mechanism that uses a composite bi-cell belt with bendable sections to sequentially laminate composite bi-cell units, comprising a separator belt and electrodes, allowing for efficient and stable folding under gravity, reducing deformation and improving quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If high-speed movement of separators is used in current laminating processes, then lamination speed is improved, but wrinkles and deformation occur leading to poor quality
Solution Approach 1:
The belt is divided into multiple composite bi-cell units with bendable sections between them, allowing each unit to be laminated independently while maintaining control over the lamination process, thus preventing wrinkles and deformation even at high speeds
Solution Approach 2:
The bendable sections are designed to be flexible and adaptable during the lamination process, allowing the belt to dynamically adjust its shape as units are laminated sequentially, preventing stress concentration and deformation that would occur with rigid structures at high speeds
2Manufacturing precision
If sequential lamination of composite bi-cell units is implemented, then manufacturing precision is improved, but device complexity increases
Solution Approach 1:
Multiple functional elements are combined into the composite bi-cell unit structure itself - the electrodes, separators, and bendable sections are integrated into a single laminated unit, simplifying the overall equipment structure while maintaining precise alignment through the inherent design of the units
Solution Approach 2:
The composite bi-cell units are designed to self-align during the lamination process through their structural design and the properties of the bendable sections, reducing the need for complex alignment mechanisms and control systems in the equipment
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 achieves high laminating efficiency and quality by ensuring accurate alignment and folding of composite bi-cell units, reducing deformation and enhancing the stability of the laminated structure, while avoiding issues like wrinkles and lithium precipitation.
Implementation Method 1
allowing for efficient and stable folding under gravity
Data Source
AI summary
The present disclosure provides laminating equipment, method and a laminated structure, and relates to the technical field of jelly roll manufacturing. The laminating equipment includes a transferring mechanism and a carrying mechanism. The transferring mechanism is configured to transfer a composite bi-cell belt downward, wherein the composite bi-cell belt has thereon a plurality of composite bi-cell units, and two adjacent composite bi-cell units are connected to each other through a bending section. The carrying mechanism has a laminating plane, and the plurality of the composite bi-cell units are laminated one by one on the laminating plane, thereby forming a laminated structure.