Negative Electrode Layer Layout for Better Electrolyte Impregnation

The active material layer is segmented into multiple layers with different thicknesses. The center portion has a thinner active material layer while the outer portions have thicker layers, allowing electrolyte to penetrate the center area effectively while maintaining high overall capacity through the thicker outer layers.

Different regions of the electrode assembly are given different local qualities in terms of active material layer thickness. The center portion receives a thinner layer to ensure electrolyte penetration, while outer portions receive thicker layers to maximize capacity, creating a non-uniform thickness distribution optimized for both impregnation and capacity.

The active material layer is divided into multiple layers with varying thicknesses. The thinner layer at the center facilitates electrolyte penetration, while the thicker outer layers provide high capacity, resolving the contradiction between penetration ease and capacity.

The solution transitions from a uniform thickness approach to a dimensionally varied thickness profile across the electrode radius. This dimensional variation in layer thickness enables simultaneous achievement of good electrolyte penetration in the center and high capacity in the outer regions.

The electrode plate is given non-uniform local quality with thinner active material layer at the center and thicker layers at outer portions. This prevents severe non-moisture phenomena that would otherwise occur in uniformly thick electrodes, thereby extending electrode plate lifespan while maintaining high overall capacity.

The invention converts the potential harm of thick active material layers (which cause non-moisture areas and reduce lifespan) into a benefit by strategically placing thinner sections at the center where electrolyte penetration is most difficult, while retaining thick high-capacity sections at outer portions where they are most effective.