Electrode Tab Geometry for Crack-Resistant Battery Plates

The patent applies local quality by creating a transition zone with intermediate thickness between the thick active material layer and the thin uncoated part. This transition zone has gradually varying thickness, providing localized structural support where it is most needed - at the stress concentration point near the tab base - without compromising the overall battery capacity enhancement from the compressed active material layer.

The patent implements beforehand cushioning by designing a transition zone that anticipates and prevents crack formation before compression occurs. This transition zone acts as a stress buffer that absorbs and distributes compression forces, preventing the concentration of stress that would otherwise lead to crack initiation at the interface between the active material layer and uncoated part.

The transition zone provides localized structural reinforcement at the critical interface region. By having the electrode plate thickness gradually decrease from the active material layer toward the uncoated part, the transition zone creates a smooth stress distribution pattern that prevents stress concentration, thereby maintaining interface strength during compression while achieving overall densification.

The transition zone serves as a pre-designed stress buffer that cushions the interface region before compression forces are applied. This gradual thickness transition prepares the structure to handle compression stresses by distributing them evenly, preventing the formation of strong stress points that would compromise interface integrity during the densification process.

Instead of creating a discrete notch that removes active material, the patent uses a continuous transition zone that gradually changes in thickness. This transition zone provides crack suppression functionality through its geometric configuration while maintaining the continuity of the active material layer, thus preserving battery capacity while still preventing crack initiation at the tab base.

Rather than removing material (notching) to prevent cracks, the patent inverts the approach by adding a transition zone with intermediate thickness. This transition zone prevents crack formation through its stress-distributing geometry while maintaining material continuity, effectively solving the crack suppression problem without the capacity loss associated with material removal.