Electrode Assembly Stacking With Separator Tension Feedback
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Solution Overview
Problem
The uneven tension of separators in stack & folding type electrode assemblies leads to non-uniform stacking of electrodes and separators, resulting in high dispersion of air permeability and wetting properties, which deteriorates the performance of secondary batteries.
Innovation Solution
An apparatus that alternately stacks electrodes and separators on a stack table, with a separator supply unit and a tension adjustment unit to maintain constant tension of the separator when folded in a zigzag shape, using a separator winding roll and a tension meter to adjust the supply height and ensure uniform stacking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If the separator is folded in a zigzag shape during stacking, then the electrode assembly can be manufactured with compact structure, but the tension of the separator becomes non-uniform causing wrinkles and high dispersion of air permeability and wetting property
Solution Approach 1:
The separator supply unit is designed to dynamically adjust the supply speed of the separator during the stacking process. As the stacking progresses and the separator is folded in zigzag shape, the supply speed is automatically adjusted to maintain constant tension, preventing wrinkles and ensuring uniform stacking of electrodes and separators throughout the entire manufacturing process.
Solution Approach 2:
A tension detection unit is installed to continuously monitor the tension of the separator during stacking. The detected tension information is fed back to the control unit, which then adjusts the supply speed of the separator supply unit in real-time to maintain optimal tension levels, thereby preventing wrinkles and ensuring uniform stacking quality.
2Ease of manufacture
If the separator tension is not uniformly controlled, then the stacking process becomes simpler, but the air permeability and wetting property of the electrode assembly show high dispersion deteriorating battery performance
Solution Approach 1:
The tension detection unit continuously monitors separator tension during stacking and provides real-time feedback to the control unit. This feedback mechanism enables automatic adjustment of the separator supply speed to maintain constant tension, ensuring uniform stacking quality and consistent air permeability and wetting properties throughout the electrode assembly, thereby improving performance reliability.
Solution Approach 2:
The system automatically regulates separator tension through the feedback-controlled supply speed adjustment, eliminating the need for manual intervention or complex external tension control mechanisms. The separator supply unit self-adjusts based on detected tension levels, maintaining manufacturing simplicity while ensuring consistent stacking quality and reliable battery performance.
Data Source
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AI summary
The present invention relates to an apparatus for manufacturing an electrode assembly. The apparatus for manufacturing the electrode assembly, in which an electrode and a separator are alternately stacked on a stack table, and the separator is folded in a zigzag shape so that the electrode is disposed between the folded separators to manufacture the electrode assembly, according to the present invention comprises a separator supply unit configured to supply the separator to the stack table, and a separator tension adjustment unit configured to constantly adjust tension of the separator supplied to the stack table, wherein the separator supply unit comprises a separator winding roll around which the separator is wound, and the separator tension adjustment unit adjusts a supply height of the separator winding roll to adjust the tension of the separator.