Jelly-roll Electrode Assembly Uncoated Portion Width

The patent applies local quality by making the uncoated portion of the negative electrode narrower than conventional designs. This localized dimensional change at the winding start portion prevents excessive material that would otherwise deform during winding, while maintaining adequate width for proper tab alignment and winding initiation.

The patent changes the dimensional parameter of the uncoated portion width to resolve the contradiction. By reducing the width from conventional larger dimensions to a specifically controlled narrower dimension, the patent eliminates deformation while preserving ease of winding operation.

The patent optimizes the width parameter of the uncoated portion to a specific narrow dimension that simultaneously achieves shape stability and adequate tab alignment. This precise parameter control resolves the contradiction by finding the optimal value that satisfies both requirements.

The patent creates an asymmetric configuration where the uncoated portion width is deliberately made narrower than both the coated portion and the positive electrode uncoated portion. This asymmetric design provides sufficient space for tab alignment while preventing deformation, resolving the contradiction between shape stability and manufacturing precision.

The patent applies local quality by modifying only the uncoated portion width while maintaining consistent manufacturing processes for the rest of the electrode plates. This localized dimensional change prevents separator damage and short-circuits without disrupting overall manufacturing consistency.

The patent implements preliminary anti-action by pre-configuring the uncoated portion with a narrower width before winding begins. This preventive measure counteracts the potential for crumpling and separator damage before they can occur during the winding process, thereby maintaining both productivity and reliability.