Cell Winding Embossing for Cathode Tab Alignment
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Solution Overview
Problem
Existing cell winding technologies face challenges in aligning cathode tabs accurately, leading to misalignment issues that decrease the yield of cells due to the uncertainty in positions of thick and thin portions of the electrode, requiring extensive data processing to adjust embossing parameters which can further exacerbate misalignment.
Innovation Solution
A method and system for cell winding that involves pre-winding with a surplus misalignment between cathode tabs, followed by embossing to align them, using a rolling device to adjust the thickness and align tabs, thereby reducing misalignment and improving yield.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If extensive data processing is performed to adjust embossing parameters, then tab misalignment is reduced, but process complexity and time increase
Solution Approach 1:
The patent extracts only the essential thickness measurement data from the pre-winding process that is directly needed for embossing parameter calculation. Rather than processing extensive historical data from multiple cells, the system focuses on the specific thickness measurements from the current electrode, simplifying the data processing requirements
Solution Approach 2:
By performing thickness measurement during the pre-winding stage, the system obtains all necessary data before the main winding process begins. This eliminates the need for complex post-processing and iterative adjustments, as the embossing parameters are predetermined based on actual measurements
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 method effectively reduces tab misalignment by aligning cathode tabs after winding, enhancing the overall yield of the cell by ensuring uniform thickness and alignment of tabs, thus improving the efficiency of the cell winding process.
Implementation Method 1
The embossing includes embossing the cathode electrode by a rolling device, such that the cathode electrode subjected to embossing satisfies that: the first cathode tab is aligned with the second cathode tab after winding
Data Source
AI summary
A method for cell winding and a system for cell winding are provided. The method includes feeding materials, preparing winding, embossing, and winding. The feeding materials is carried out to obtain a separator, a cathode electrode, and an anode electrode, where the cathode electrode satisfies that: after pre-winding, a first cathode tab of the cathode electrode and a second cathode tab of the cathode electrode are arranged with a surplus misalignment. A starting end of the separator, a starting end of the cathode electrode, and a starting end of the anode electrode are fixed to a winding device. The cathode electrode is embossed by a rolling device, such that the first cathode tab is aligned with the second cathode tab after winding. The embossing is configured to enable the surplus misalignment between the first cathode tab and the second cathode tab after the winding to be zero.