Battery Cell Winding Needle Layout for Continuous Pole Piece Insertion
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Solution Overview
Problem
Existing winding devices for lithium-ion battery cells require separate insertion of anode and cathode pole pieces after each winding, significantly reducing efficiency due to the time-consuming nature of these operations.
Innovation Solution
A winding device with integrated unwinding, merging, and cutting equipment that allows for continuous winding by cutting off and transporting the cathode pole piece after each cell is formed, eliminating the need for separate anode pole piece insertion, and utilizing guiding rollers and cutters to align and separate materials for efficient cell formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If separate anode and cathode pole piece insertion is performed after each winding, then the winding device can complete cell formation, but the production efficiency is significantly reduced due to time-consuming insertion operations
Solution Approach 1:
The anode pole piece is pre-inserted into the winding needle before the winding process begins. This preliminary action eliminates the need for separate anode pole piece insertion after each cell is wound, allowing continuous winding operations and significantly reducing the time loss associated with repeated insertion operations.
Solution Approach 2:
The winding device is designed to perform continuous winding operations without interruption for anode pole piece insertion. By pre-inserting the anode pole piece and maintaining it in position throughout the winding process, the device achieves continuous productive action, with only the cathode pole piece requiring insertion between cells.
2Productivity
If the anode pole piece is pre-inserted into the winding needle, then continuous winding is enabled, but the device complexity increases due to additional positioning and holding mechanisms
Solution Approach 1:
The anode pole piece is nested within the winding needle structure, specifically positioned in a groove or channel of the needle. This nesting arrangement allows the anode pole piece to be held in place using the existing geometric features of the winding needle, minimizing the need for additional complex positioning and holding mechanisms while enabling continuous winding operations.
Data Source
AI summary
A winding device includes: a first unwinding equipment, a second unwinding equipment, a third unwinding equipment and a fourth unwinding equipment, respectively configured for outputting a first diaphragm, a cathode pole piece, a second diaphragm and an anode pole piece; a merging equipment, configured for merging passing material strip layers; a pole-piece-inserting equipment, configured for cutting off the passing cathode pole piece, and transporting a starting end of the cathode pole piece downstream; a winding equipment, including a turret and at least two winding needles, the turret is adapted to drive each of the winding needles to pass by a first station and a second station sequentially; and a guiding roller, the layers of material strip located between the first station and the second station winding through the guiding roller.