Battery Cell Electrode Layout to Prevent Shearing and Dendrites

The patent applies local quality by creating an insulating area on the positive electrode sheet at its peripheral portion. This insulating area has different properties (electrical insulation) from the rest of the positive electrode sheet, allowing the negative electrode sheet to extend beyond the positive electrode sheet's active material area without causing short circuits. The insulating area is specifically located where the negative electrode sheet extends, providing localized protection while maintaining overall battery performance.

The patent creates a localized insulating area at the peripheral portion of the positive electrode sheet. This insulating area specifically addresses the edge region where dendrite formation occurs, while the central active material area remains fully functional. The insulating property is applied only where needed (at the periphery) to prevent dendrite formation and short circuits, without affecting the overall electrochemical performance of the battery.

The patent segments the positive electrode sheet into two distinct functional regions: an active material area for electrochemical reactions and a peripheral portion that forms the insulating area. This segmentation allows the positive electrode sheet to provide structural support and stability through its extended peripheral portion, while the insulating property prevents harmful effects. The segmentation enables the electrode structure to fulfill multiple functions (support, insulation, electrochemical activity) without requiring uniform enlargement of the entire electrode.