Electrode Assembly Separator Tensioning for Clean Cut Edges
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Solution Overview
Problem
The existing methods for manufacturing electrode assemblies in secondary batteries face challenges in improving the quality of the separator cut-out surface and the efficiency of the manufacturing process, particularly in maintaining consistent stacking and cutting of electrode components.
Innovation Solution
An apparatus is introduced that includes a stacking plate with a first stacking region, an actuator for moving the stacking plate, an electrode assembly release unit for tensioning and releasing the separator, a separator fixing unit for pressing the separator, and a separator cutting unit for precise cutting, along with a moving plate and associated actuators to manage the stacking and cutting process efficiently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the separator is continuously supplied while stacking electrode plates, then the manufacturing efficiency is improved, but the quality of the separator cut-out surface deteriorates due to difficulty in maintaining consistent tension and positioning
Solution Approach 1:
The separator is supplied and positioned in advance on the stacking plate before the electrode plates are stacked. This preliminary positioning allows the separator to be properly aligned and tensioned before the cutting operation, ensuring high cut-out surface quality while maintaining continuous supply for manufacturing efficiency.
Solution Approach 2:
The separator fixing unit uses the separator's own properties (flexibility and tensile strength) to maintain tension during the stacking process. The separator is stretched and fixed to the stacking plate, allowing it to self-maintain its position and tension without requiring additional active control mechanisms during the stacking operation.
2Manufacturing precision
If the stacking plate moves down by a fixed distance for each component stacked, then the stacking precision is improved, but the device complexity increases due to multiple actuators and coordination requirements
Solution Approach 1:
Multiple actuators (first actuator for stacking plate, second actuator for moving plate) are coordinated to work together in a unified control system. The actuators are merged into a single control sequence that manages the stacking process, reducing the complexity that would arise from independent control of each component.
Solution Approach 2:
The stacking plate and moving plate are designed to move dynamically by fixed distances corresponding to component thicknesses. This dynamic adjustment allows precise positioning for each stacking operation while using simple, repeatable motion patterns that reduce control complexity.
3Manufacturing precision
If the separator is pressed firmly before cutting, then the cut-out surface quality is improved, but the risk of damaging the separator or electrode plates increases
Solution Approach 1:
The separator fixing unit applies pressing force locally to the separator at the cutting position rather than uniformly across the entire separator or electrode assembly. This localized pressing ensures high cut-out surface quality at the cutting point while avoiding excessive force that could damage other components.
Solution Approach 2:
The separator is pressed and fixed to the stacking plate in advance before the cutting operation. This preliminary fixing ensures the separator is properly positioned and tensioned, allowing for clean cutting without requiring excessive pressing force during the actual cutting process, thereby reducing damage risk.
4Manufacturing precision
If the electrode assembly is released by pulling it outward, then the separator tension is improved for cutting quality, but the manufacturing process time increases due to the release and repositioning steps
Solution Approach 1:
The separator is tensioned and fixed to the stacking plate in advance before the electrode plates are stacked and before the cutting operation. This preliminary tensioning eliminates the need for time-consuming release and repositioning steps later in the process, as the separator is already in the optimal tensioned state for cutting.
Solution Approach 2:
The separator remains continuously tensioned and fixed to the stacking plate throughout the stacking and cutting operations. This continuous tensioning maintains the separator in the optimal state for cutting without requiring interruption to release and reposition, thereby reducing process cycle time while maintaining cut-out surface quality.
Data Source
AI summary
An apparatus for manufacturing an electrode assembly includes a stacking plate including a first stacking region in which a cathode plate, an anode plate and a separator are stacked; a first actuator connected to the stacking plate and configured to move the stacking plate; an electrode assembly release unit configured to, in a state in which a separator is present on an uppermost portion of a preliminary electrode assembly formed by stacking the cathode plate, the anode plate, and the separator, provide tension to the separator by pulling the preliminary electrode assembly to the outside of the stacking plate; a separator fixing unit configured to press the separator in a state in which only the separator remains on the stacking plate; and a separator cutting unit configured to cut the separator on the stacking plate after the separator fixing unit presses the separator.