Floatation Roll Meandering Correction for Lithium Foil Conveyance
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Solution Overview
Problem
Existing conveyer apparatuses for lithium metal secondary batteries face issues with meandering of lightweight lithium foils during floatation conveyance, leading to a high risk of breakage due to uneven load distribution during meandering correction.
Innovation Solution
A conveyer apparatus with a floatation roll that supports the lithium foil contactlessly, featuring a cylindrical shape with different wrap angles on the entry and exit sides, and a driving unit that rotates the roll in the yaw direction to correct meandering by adjusting the wind forces applied to the foil.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If floatation conveyance is used to convey lithium foil, then contact resistance is eliminated and low-tension conveyance is enabled, but meandering of the lithium foil is likely to occur
Solution Approach 1:
A support pad is introduced as an intermediary between the floatation roll and the lithium foil. The support pad provides a stable reference surface that prevents meandering while maintaining the contactless floatation conveyance benefits. The pad acts as a mediator that stabilizes the foil without requiring direct roll-to-foil contact.
2Stability of the object's composition
If the floatation roll is tilted to correct meandering, then meandering correction is achieved, but the work is easily torn in the width direction due to uneven load distribution
Solution Approach 1:
The support pad serves as a mediator that distributes correction forces evenly across the lithium foil width. Instead of tilting the floatation roll which creates concentrated uneven loads, the pad provides a stable platform that allows meandering correction through controlled tilt while maintaining uniform load distribution and preventing work tearing.
Solution Approach 2:
The system changes the parameter of load distribution by introducing the support pad. The pad transforms the concentrated uneven loading that would occur with direct roll tilt into a distributed uniform loading pattern, allowing meandering correction without exceeding the material's tear resistance.
3Strength
If a film is bonded to the lithium foil for conveyance, then the foil is protected from breakage, but the film bonding and peeling process is required
Solution Approach 1:
The support pad acts as an intermediary that provides protection during conveyance without requiring permanent film bonding. The pad can be temporarily engaged during critical conveyance sections and removed or repositioned, eliminating the need for continuous film bonding and peeling processes while maintaining foil protection.
Solution Approach 2:
The invention extracts the protection function from a permanent film bonding system and implements it through a removable support pad. This allows the protection mechanism to be applied only where and when needed during the conveyance process, eliminating unnecessary film bonding and peeling operations.
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 apparatus minimizes the risk of breakage by ensuring low-tension conveyance and effective meandering correction, suitable for lightweight lithium foils used in lithium metal secondary batteries.
Implementation Method 1
a floatation roll that supports a work to be conveyed contactlessly using a force applied to the work contactlessly
Data Source
AI summary
A floatation roll supports a work to be conveyed contactlessly using a force applied to the work contactlessly. The floatation roll has a cylindrical shape extending in a direction of width of the work, and at least a surface of the floatation roll facing the work being formed by a circumferential surface. A driving unit rotates the floatation roll in a yaw direction. Of a wrap angle of the work supported by the floatation roll contactlessly, a wrap angle on an entry side with respect to an apex point and a wrap angle on an exit side with respect to the apex point are set to be different.