Pendulum Separator Unwinding for High-Speed Electrode Stacking
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Solution Overview
Problem
Existing methods for stacking electrode plates in secondary battery cells, such as the zigzag-type battery cell, face limitations due to speed constraints that can damage the separator when increasing the moving speed of the stack base, leading to inefficiencies in the stacking process.
Innovation Solution
A separator unwinding assembly that swings around a rotation axis above the stack base, using arms, rollers, and actuators to supply the separator between electrode plates without moving the stack base, allowing for increased stacking speed and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the stack base moves horizontally to supply separators between electrode plates, then the stacking process can be completed, but increasing the moving speed causes increased inertial force that damages the separator
Solution Approach 1:
Instead of moving the stack base horizontally to supply separators, the invention inverts the approach by making the separator unwinding assembly move pendulum-wise to supply the separator to the stationary stack base. This reversal eliminates the inertial force problem caused by horizontal acceleration and deceleration of the stack base, allowing for faster operation without damaging the separator.
Solution Approach 2:
The invention extracts the separator supply function from the moving stack base and transfers it to a dedicated separator unwinding assembly. This separation allows the stack base to remain stationary while the separator is supplied independently through the pendulum-type unwinding mechanism, eliminating the harmful inertial forces that occurred when the stack base moved.
2Ease of operation
If the stack base moves horizontally in the order of movement-stop-opposite movement, then the separator can be supplied sequentially, but the acceleration and deceleration cycles limit the maximum moving speed
Solution Approach 1:
The invention inverts the traditional approach by making the separator unwinding assembly move instead of the stack base. The pendulum-type motion of the unwinding assembly naturally provides sequential separator supply without requiring the stack base to undergo acceleration and deceleration cycles, thereby eliminating the speed limitation.
Solution Approach 2:
The separator unwinding assembly employs dynamic pendulum motion to supply separators sequentially. This dynamic approach allows the system to maintain high speed operation while naturally providing the required sequential supply pattern, as the pendulum swing inherently creates the timing and sequence needed for alternating electrode plate and separator placement.
3Productivity
If the stack base moves at high speed, then productivity increases, but the inertial force applied to the separator during stopping causes damage
Solution Approach 1:
The invention extracts the separator supply function from the stack base motion and assigns it to a separate unwinding assembly. This extraction eliminates the harmful inertial forces that acted on the separator when the stack base accelerated and decelerated, while still enabling high productivity through the dynamic unwinding mechanism.
Solution Approach 2:
The separator unwinding assembly acts as an intermediary mechanism between the electrode plate stacking process and the separator supply. By introducing this intermediate device with pendulum motion, the system can achieve high stacking throughput without subjecting the separator to damaging inertial forces, as the intermediary absorbs and manages the motion dynamics.
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
This approach enables rapid and stable stacking of separators without damaging them, maximizing stacking speed while maintaining a simple structure and preventing separator damage.
Implementation Method 1
the separator unwinding assembly is configured to swing around a rotation axis located above a stack surface of the stack base
Implementation Method 2
separator unwinding assembly capable of quickly stacking a separator with a simple structure
Data Source
AI summary
A separator unwinder actuated in a pendulum-type is provided in an electrode plate stacking apparatus with a stationary stack base. A positive electrode plate and a negative electrode plate are stacked alternately onto the stack surface of the stack base, and a separator is provided therebetween. The electrode plates are stacked onto the stack base from right and left sides of the stack base. The separator unwound from the separator roll reaches the stack base via a plurality of rollers. The separator covers the electrode plate placed on the stack surface of the stack base by the pendulum-type unwinder. In this way, it is possible to supply the separator stably and stably.