Wound Electrode Configuration for Battery Capacity and Alignment
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Solution Overview
Problem
Conventional wound-type batteries face issues with reduced capacity and dimensional deviations due to improper alignment and opposition of positive and negative electrodes, leading to decreased performance and shape deformation during manufacturing.
Innovation Solution
A wound-type electrochemical device is designed with a belt-like positive and negative electrode configuration, where both sides of each electrode are covered with active material layers, and the electrodes are arranged symmetrically around a central winding core, ensuring optimal opposition and alignment, with the ends of the electrodes fixed using an adhesive tape to maintain flatness and prevent deformation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If a separate winding core is used to form the wound body, then the structural definition and shape control are improved, but the manufacturing complexity and electrode alignment precision deteriorate due to sequential winding processes
Solution Approach 1:
The invention merges the winding core function with the electrode structure itself by using the electrode as the winding core. The electrode is folded back on itself to form the winding core portion, eliminating the need for a separate winding core and enabling simultaneous winding of multiple electrodes with improved alignment precision.
Solution Approach 2:
The electrode serves multiple functions: it acts as both the functional electrochemical component and the structural winding core that defines the wound body shape. This multi-functionality eliminates the separate winding core and simplifies the manufacturing process while maintaining shape control.
2Ease of manufacture
If only the end of one electrode is wound around the winding core first, then the winding process is simplified, but the electrode opposition and capacity deteriorate due to misalignment
Solution Approach 1:
The electrode is preliminarily folded back on itself to form the winding core portion before the actual winding process begins. This preliminary action ensures that subsequent electrodes can be wound around the same core with proper alignment, maintaining both manufacturing simplicity and electrode opposition for maximum capacity.
Solution Approach 2:
The folded-back electrode portion serves as an intermediary winding core that facilitates the simultaneous winding of multiple electrodes. This intermediary structure enables proper alignment and opposition of electrodes while maintaining ease of manufacture through a simplified winding process.
3Device complexity
If a separate winding core is removed from the wound body, then the device complexity is reduced, but the structural stability and shape maintenance deteriorate
Solution Approach 1:
The structural support function previously provided by the separate winding core is merged into the electrode structure itself. The folded-back electrode portions form an integrated winding core that maintains structural stability without requiring removal of separate components, thus reducing device complexity while preserving shape stability.
4Ease of manufacture
If electrodes are wound sequentially around a winding core, then the manufacturing process is simplified, but the relative position alignment and dimensional precision deteriorate
Solution Approach 1:
The electrode serves as both the functional component and the winding core, enabling all electrodes to be wound around the same core simultaneously. This universal approach maintains manufacturing simplicity while achieving superior dimensional precision through consistent alignment relative to the common electrode-based core.
Data Source
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AI summary
The invention provides a wound-type electrochemical device capable of increasing the capacity. A wound-type electrochemical device comprises a wound body formed by winding a belt-like positive electrode and a belt-like negative electrode, each of the electrodes being a current collector having an active material layer formed on both sides thereof, so as to sandwich a belt-like separator therebetween, wherein both sides of an end on a center side of the wound body of the positive electrode adjoin the negative electrode via the separator, respectively, while both sides of an end on the center side of the wound body of the negative electrode adjoin the positive electrode via the separator, respectively.