Separator Strip Stacking With Zero-Speed Foil Release
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Solution Overview
Problem
In the production of electrochemical cells, the speed of advancement and positioning of separator strips and sheets of foil are significant limitations, particularly in achieving high precision and preventing damage from the 'sail effect' caused by asymmetrical fluid-dynamic pressures, which can lead to deformation and tension issues in the separator strip.
Innovation Solution
A stacking apparatus and method that utilize a controlled feeding and handling system with an outgoing orientation control device and a release assembly to maintain a consistent movement and minimize the sail effect by ensuring zero relative speed during sheet release and maintaining a constant distance between the orientation control device and the stacking surface, allowing continuous and precise stacking without stops.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the separator strip is advanced at high speed during stacking, then productivity is improved, but the separator strip is damaged due to asymmetrical fluid-dynamic pressures (sail effect)
Solution Approach 1:
The patent applies preliminary anti-action by using a tensioning device to pre-establish counteracting forces against the sail effect before it causes damage. The tensioning device creates a controlled tension state that opposes the asymmetrical fluid-dynamic pressures, preventing deformation and damage to the separator strip while allowing high-speed advancement.
Solution Approach 2:
The patent changes physical parameters by controlling the tension force applied to the separator strip through the tensioning device. By adjusting the tension parameter, the system maintains optimal conditions for high-speed stacking while compensating for the sail effect, thus resolving the contradiction between speed and damage prevention.
2Productivity
If the separator strip is advanced quickly to increase production speed, then productivity is improved, but manufacturing precision deteriorates due to tension issues and deformation
Solution Approach 1:
The patent implements feedback control through the tensioning device, which continuously monitors and adjusts the tension in the separator strip during advancement. This feedback mechanism ensures that the strip maintains proper tension and alignment even at high unwinding speeds, preventing deformation and ensuring precise stacking without sacrificing productivity.
3Manufacturing precision
If stops are introduced during stacking to ensure precision, then manufacturing precision is improved, but productivity deteriorates due to interrupted continuous operation
Solution Approach 1:
The patent applies the principle of continuity by maintaining uninterrupted advancement of the separator strip through controlled tensioning. The tensioning device enables precise positioning and stacking to occur during continuous motion without requiring stops, thereby maintaining both high manufacturing precision and continuous operational efficiency.
4Adaptability or versatility
If the distance between the orientation control device and stacking surface is increased to allow for adjustments, then adaptability is improved, but the separator strip is more susceptible to sail effect and deformation
Solution Approach 1:
The patent applies dynamics by making the distance between the orientation control device and stacking surface variable rather than fixed. The tensioning device dynamically adjusts the separator strip tension based on real-time conditions, allowing the system to adapt to different stacking requirements while maintaining optimal protection against the sail effect through continuous tension control.
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 increased unwinding and stacking speeds while reducing damage to the separator strip, ensuring high precision and efficient alignment of layers, thus overcoming limitations in process speed and maintaining constant tension for precise electrochemical cell production.
Implementation Method 1
a tensioning device configured to advance the separator strip along a feed path while maintaining a constant tension of the separator strip
Implementation Method 2
an outgoing orientation control device of the separator strip placed directly upstream of the stacking unit and configured to define an outgoing reference direction of the separator strip
Implementation Method 3
a handling device configured to move the stacking surface along a second working path defined by a closed path
Implementation Method 4
a release assembly of a sheet of foil configured to release, at a minimum release distance from the stacking surface, a sheet of foil upon an approaching movement of the release assembly with respect to the stacking surface to a minimum release distance, said approaching movement being configured so as to produce a condition of substantially zero relative speed between the release assembly and the stacking surface
Data Source
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AI summary
Stacking apparatus and method for stacking a separator strip (NS) and sheets of foil (201, 301) comprising a feeding unit (20) for feeding said separator strip (NS) comprising an outgoing orientation control device (R2) of said separator strip (NS), configured to define an outgoing reference direction (DRU) of said separator strip (NS), a stacking unit (1) comprising a stacking surface (10) for receiving said separator strip (NS) and said sheets of foil, a handling unit (130) for respectively moving said outgoing orientation control device (R2) of said separator strip (NS) and said stacking surface (10), a first and/or a second release assembly of a sheet of foil (200, 300) for releasing at a minimum release distance (DmR) from said stacking surface (10) a first or a second sheet of foil (201, 301) with a condition of substantially zero relative speed.