Turret Winding Assembly for Continuous Li-Ion Electrode Feeding
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Solution Overview
Problem
Existing winding devices for lithium-ion batteries require separate insertion of anode and cathode pole pieces for each cell winding, significantly reducing efficiency due to the time-consuming process.
Innovation Solution
A winding device with multiple unwinding and merging equipment, pole-piece-processing units, and a turret-based winding mechanism that allows for continuous winding without the need for repeated pole piece insertion, utilizing guiding rollers and cutting-off equipment to facilitate seamless cell formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If separate insertion of anode and cathode pole pieces is performed for each cell winding, then the winding device can complete cell formation, but the production efficiency is significantly reduced due to time-consuming insertion process
Solution Approach 1:
The pole pieces are pre-assembled into a combined material strip containing multiple pole pieces (anode and cathode) in sequence before the winding process begins. This preliminary preparation eliminates the need for repeated insertion operations during winding, as the combined strip is simply fed continuously through the winding mechanism, significantly reducing insertion time and improving productivity
Solution Approach 2:
Multiple pole pieces (anode and cathode) are merged into a single combined material strip that contains all necessary pole pieces for multiple cells in one continuous structure. This merging allows the winding device to process multiple cells simultaneously or in rapid succession without stopping for separate pole piece insertions, thereby resolving the contradiction between productivity and time loss
2Productivity
If separate insertion of pole pieces is performed, then cell formation can be completed, but the transition time between cells increases
Solution Approach 1:
The combined material strip enables continuous feeding of pole pieces through the winding mechanism without interruption. The strip maintains continuous contact with the winding needle, allowing the winding process to proceed without stopping for pole piece insertions between cells. This continuity eliminates idle transition time and maintains productive action throughout the entire winding process
3Productivity
If repeated pole piece insertion is performed, then cell winding can be completed, but positioning accuracy is compromised leading to quality issues
Solution Approach 1:
The combined material strip is pre-formed with precise positioning of all pole pieces before the winding process. This preliminary precision work is done once during strip fabrication, eliminating repeated positioning operations that could introduce errors. The pre-positioned strip ensures consistent, accurate placement of pole pieces throughout the winding process, maintaining manufacturing precision while improving productivity
Data Source
AI summary
A winding device including: a merging equipment, for merging a passing first diaphragm, a passing cathode pole piece, a passing second diaphragm and a passing anode pole piece to form a combined material strip; a first pole-piece-processing equipment, for cutting off the passing cathode pole piece, separating from each other a first upstream cut-off end and a first downstream cut-off end, and connecting them with a tape; a winding equipment, including a turret and at least two winding needles, the turret driving each of the winding needles to pass by a first station and a second station sequentially; and a guiding roller and a cutting-off equipment.