Cylindrical Cell Tab Taping to Prevent Wrinkles and Tab Exposure
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Solution Overview
Problem
In the production of lithium cylindrical cells, the negative electrode tab can short-circuit with the aluminum casing, leading to corrosion and potential electrolyte leakage due to exposure and contact, which existing adhesive taping methods fail to adequately prevent.
Innovation Solution
A method involving cutting adhesive paper to form a discontinuous vertical side, wrapping it around the cell to protrude and cover the tabs, and adhering it to the cell ends to minimize overlap and adhesion area, reducing wrinkle formation during insertion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If adhesive paper is wrapped around the cylindrical cell to cover tabs, then tab exposure is prevented, but the overlapping and adhesion part of the adhesive paper is easily squeezed and wrinkled by the aluminum casing during insertion
Solution Approach 1:
The adhesive paper is divided into a body portion and a protruding portion, with the protruding portion specifically designed to cover the tabs. This segmentation allows the adhesive paper to fulfill its protective function while reducing the overlap area that is susceptible to wrinkling during insertion.
Solution Approach 2:
The adhesive paper extends beyond the body of the cylindrical cell to form a protruding portion that covers the tabs. This partial extension ensures complete tab coverage while minimizing the overlapping area compared to a full wrap-around configuration, thereby reducing wrinkle formation.
2Strength
If the overlapping and adhesion area of the adhesive paper is large, then the adhesive paper is more secure on the cell, but it is more easily squeezed and wrinkled by the aluminum casing during insertion
Solution Approach 1:
The adhesive paper is designed with different functional zones: a body portion with adequate adhesion for secure mounting, and a protruding portion with minimal overlap that covers the tabs without excessive material. This local differentiation ensures both secure attachment and resistance to wrinkling in the critical tab coverage area.
Solution Approach 2:
The overlapping and adhesion portion is extracted and minimized to only what is necessary for secure attachment, while the protruding portion is designed to extend just enough to cover the tabs. This extraction eliminates unnecessary material that would be susceptible to squeezing and wrinkling during insertion.
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
This configuration reduces tab exposure and enhances safety by minimizing wrinkle-induced contact, facilitating smooth insertion and improving battery safety.
Implementation Method 1
adhering the protruding part of the adhesive paper to the ends of the cell
Data Source
AI summary
A method for taping tab adhesive of a cylindrical cell, including: cutting adhesive paper raw material to obtain a rectangular adhesive paper with a length equal to a predetermined length; a side of the adhesive paper in a lengthwise direction is made into a discontinuous vertical side; wrapping and taping the adhesive paper around the cylindrical cell so that a portion of the adhesive paper protrudes from the cell to form a protruding part, the protruding part being configured to cover tabs at both ends of the cylindrical cell; adhering the protruding part of the adhesive paper to the ends of the cell to complete taping of the cylindrical cell.