Electrode Assembly With Variable Layer Thickness for Battery Power Balance
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Solution Overview
Problem
Existing secondary batteries face a challenge in simultaneously achieving high energy density and output performance, as designs often prioritize one characteristic over the other.
Innovation Solution
An electrode assembly is designed with first and second electrodes having differently thickened electrode active material layers, where the first electrode has a thicker layer for higher energy density and the second electrode has a thinner layer for improved output performance, with distinct tabs and electrode leads to manage current flow effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If electrodes are designed with high loading to maximize energy density, then energy density is improved, but output performance deteriorates
Solution Approach 1:
The electrode assembly employs electrodes with non-uniform active material layer thicknesses, where different regions (first-a, first-b, first-c electrodes) have different thicknesses optimized for different functions. Thicker regions provide higher capacity for energy density, while thinner regions facilitate better ion transport for output performance.
Solution Approach 2:
The electrode assembly is divided into multiple electrode units with different active material layer thicknesses (first-a, first-b, first-c electrodes). This segmentation allows each electrode type to contribute differently to the overall battery performance, with thicker electrodes contributing more to capacity and thinner electrodes improving rate capability.
2Power
If electrodes are designed with low loading to improve output performance, then output performance is improved, but energy density deteriorates
Solution Approach 1:
Specific electrode regions (first-b and first-c electrodes with thinner active material layers) are designed with reduced thickness to optimize ion transport and electrical conductivity, thereby improving output performance without requiring all electrodes to be thin, thus preserving overall energy density.
Solution Approach 2:
The electrode assembly segments electrodes into different thickness categories (first-a with thicker layers for capacity, first-b and first-c with thinner layers for rate performance), allowing the system to achieve both high output performance and maintained energy density through the combined contribution of different electrode types.
Data Source
AI summary
An electrode includes a first electrode and a second electrode alternately stacked with a separator therebetween. The first electrode a first-a electrode and a first-b electrode, in which electrode active material layers have thicknesses different from each other.