Gradient-Grooved Electrode Plate for Better Electrolyte Infiltration
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Solution Overview
Problem
Insufficient electrolyte solution between the electrode plate and the separator in secondary batteries leads to inadequate infiltration, resulting in high internal resistance, capacity loss, and issues like electrolyte flow discontinuity and black flecks.
Innovation Solution
The electrode plate is designed with N first regions, each with a groove depth increasing from the periphery to the center, allowing more electrolyte solution to be accommodated and improving infiltration, while maintaining a sufficient active material layer to reduce capacity loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the electrode plate is designed with deeper grooves to improve electrolyte infiltration, then the electrolyte infiltration degree improves, but the active material layer volume decreases leading to capacity loss
Solution Approach 1:
The groove depth is designed to vary spatially across the electrode plate, with deeper grooves at the periphery and shallower grooves toward the center. This local variation optimizes electrolyte infiltration at the periphery where it is most needed while preserving active material volume in the central region, thereby resolving the contradiction between infiltration degree and capacity retention.
2Reliability
If uniform deep grooves are created across the electrode plate to ensure electrolyte supply, then electrolyte infiltration improves, but the active material capacity is significantly reduced
Solution Approach 1:
Instead of uniform grooves, the invention implements a gradient groove depth design where peripheral regions have deeper grooves for enhanced electrolyte access, while central regions have shallower grooves to maintain active material volume. This localized differentiation ensures adequate electrolyte supply throughout the electrode plate without sacrificing overall battery capacity.
Data Source
AI summary
An electrode plate includes a current collector and an active material layer that are stacked. The electrode plate is provided with N first regions. The active material layer in each first region is provided with a groove. An (S+1)th first region is closer to a center of the electrode plate than an Sth first region. A depth of the groove located in the Sth first region is HS, and a depth of the groove located in the (S+1)th first region is HS+1, satisfying: HS<HS+1, where N is a positive integer greater than or equal to 2, and S is a positive integer greater than or equal to 1 and less than N. The depths of the grooves in a plurality of first regions of the electrode plate in this application change in a gradient from the periphery to the center of the electrode plate.