Battery Winder Separator Alignment via Nip Roll Geometry
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Solution Overview
Problem
The existing winder for rechargeable battery electrode assemblies has a complex structure and prolonged winding cycles due to the need for adjusting the separator to a vertical position after each winding, which decreases productivity and lengthens the waiting time for new winding.
Innovation Solution
A winder design where the center of the nip roll, a winding core, and the surface of a completed electrode assembly form a straight or vertical line, allowing for direct mounting and winding of new plates and separators without the need for additional adjustments, thereby shortening the winding cycle and improving productivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a control roll is provided to adjust the separator to a vertical state after winding, then the separator positioning is improved, but the device structure becomes complicated and the winding cycle is lengthened
Solution Approach 1:
The invention removes the control roll from the winder structure. Instead of using a separate control roll to adjust the separator, the separator is directly fed from the nip roll to the winding core in a straight line, eliminating the need for additional control mechanisms and simplifying the overall device structure.
Solution Approach 2:
Rather than using an active control roll to push and adjust the separator into position, the invention inverts the approach by designing the geometry such that the separator naturally follows a straight path from the nip roll to the winding core, requiring no active adjustment mechanism.
2Manufacturing precision
If a control roll is provided to adjust the separator to a vertical state after winding, then the separator positioning is improved, but the winding cycle is lengthened
Solution Approach 1:
The control roll is removed from the system, eliminating the time required for separator adjustment operations. The separator is directly positioned from the nip roll to the winding core, reducing the winding cycle time and improving productivity.
Solution Approach 2:
The invention skips the separator adjustment step entirely by designing the feed path so that the separator naturally maintains the correct position from the nip roll to the winding core, eliminating the time-consuming adjustment operation and shortening the overall winding cycle.
3Manufacturing precision
If the separator is adjusted to a vertical state using a control roll, then the separator positioning is improved, but the waiting time for new winding is lengthened
Solution Approach 1:
The control roll adjustment mechanism is extracted from the system. The separator feed path is redesigned to naturally maintain vertical alignment from the nip roll to the winding core, eliminating the time required for separator adjustment and reducing waiting time for the next winding operation.
Solution Approach 2:
The separator is pre-positioned in the correct vertical alignment through the geometric design of the feed path from the nip roll to the winding core, before the winding operation begins. This preliminary positioning eliminates the need for post-winding adjustment and reduces waiting time.
Data Source
AI summary
An exemplary embodiment provides a winder for an electrode assembly of a rechargeable battery capable of improving productivity by shortening a winding cycle. A winder for an electrode assembly of a rechargeable battery according to an exemplary embodiment includes: a nip roll catching and feeding a positive plate and a negative plate, and a separator; a rotor disposed below the nip roll to rotate; and a plurality of winding cores arranged in the rotor at a regular interval in a rotation direction of the rotor to rotate and move forward or backward from the rotor, wherein the center of the nip roll, the center of any one winding core among the plurality of winding cores, and one surface of an electrode assembly of another winding core which is winding-completed form a straight line.