Electrode Assembly Winding Fixation to Prevent Separator Folding
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Solution Overview
Problem
In the manufacturing of jelly-roll-type electrode assemblies, the elastic force of the positive electrode can cause the separator to be folded during winding, leading to defects in secondary batteries.
Innovation Solution
An apparatus and method for manufacturing an electrode assembly that includes a mandrel for winding the electrodes and separators, a first fixing part to secure the outer periphery of the assembly, and a second fixing part to fix the separators, with the first fixing part including a position adjustment mechanism to manage the winding thickness and prevent separator folding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the separator is cut during winding, then the winding process can proceed, but the winding force of the separator is reduced causing the positive electrode to rotate and the separator to fold
Solution Approach 1:
The push roller is positioned in advance at the appropriate location to push the positive electrode before the separator is completely wound. This preliminary action prevents the positive electrode from rotating and the separator from folding, ensuring manufacturing precision while maintaining productivity
Solution Approach 2:
The push roller acts as an intermediary component between the separator and the positive electrode. It applies controlled force to the positive electrode to prevent rotation, thereby protecting the separator from folding while allowing the winding process to continue efficiently
2Device complexity
If the positive electrode is not fixed during winding, then the winding process is simple, but the positive electrode rotates due to elastic force causing separator folding
Solution Approach 1:
The push roller is positioned in advance at the appropriate location to push the positive electrode before the separator is completely wound. This preliminary action prevents the positive electrode from rotating and the separator from folding, ensuring manufacturing precision while maintaining productivity
Solution Approach 2:
Instead of fixing the entire positive electrode, only a local section is pushed by the push roller at the critical position where the separator is being wound. This localized intervention is sufficient to prevent rotation and folding while keeping the device simple
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 effectively suppresses the elastic force of the positive electrode until the separator is completely wound, preventing folding and reducing defects in secondary batteries.
Implementation Method 1
the elastic force of the positive electrode can cause the separator to be folded during winding
Data Source
AI summary
An apparatus for manufacturing an electrode assembly, includes a mandrel, a first fixing part, and a second fixing part. The mandrel to winds an electrode assembly including a first electrode, a first separator, a second electrode, and a second separator. The first fixing part to fix an outermost periphery of the electrode assembly, and the second fixing part is positioned to be spaced apart from the first fixing part along a circumference of the mandrel and to fix the first and second separators. The first fixing part includes a position adjustment part to adjust a position thereof in accordance with a winding thickness of the electrode assembly. A method comprising the same is also provided.