Wound Electrode Assembly Half-Coating for Deformation Control

The patent applies local quality by creating a half-coating portion on the leading edge of the positive electrode plate where active material is coated on only one surface instead of both surfaces. This localized modification prevents excessive reactions in the leading edge region while maintaining full coating in other regions to preserve energy density. The half-coating portion is specifically positioned at the leading edge where the negative electrode plate's active material begins, creating an unreacted region that prevents internal deformation.

The patent applies beforehand cushioning by creating an unreacted region in the leading edge through the half-coating configuration. This unreacted region acts as a buffer zone that prevents excessive reactions during battery operation, thereby cushioning against internal deformation and structural collapse. The half-coating portion is positioned beforehand at the leading edge where deformation is most likely to occur during winding and operation.

The patent applies local quality by modifying only the leading edge region of the positive electrode plate through half-coating, while maintaining the full thickness and coating in other regions. This allows the electrode plate to have sufficient overall capacity while creating a localized unreacted region at the leading edge that prevents internal deformation. The half-coating portion reduces the effective thickness and reactivity in the critical leading edge area without compromising the overall capacity of the electrode plate.