3D Electrode Constraint Structure for Battery Cycle Life
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional energy storage devices face challenges with reliability and cycle life due to electrode expansion and contraction during charging and discharging, leading to potential electrical short circuits and device failure.
Innovation Solution
The implementation of three-dimensional structures with a constraint that maintains pressure on the electrode assembly, inhibiting expansion and buckling by applying greater pressure in the stacking direction than in perpendicular directions, thereby enhancing energy density and cycle life.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If conventional two-dimensional laminar architectures are used, then device structure is simple, but energy density and active material utilization are limited
Solution Approach 1:
The patent transitions from conventional two-dimensional laminar electrode architectures to three-dimensional stacked architectures. The electrodes are arranged in multiple layers stacked along a longitudinal axis, with alternating positive and negative electrodes separated by microporous separators. This dimensional change increases the surface area and active material volume within the same geometric footprint, thereby improving energy density and active material utilization while maintaining structural simplicity through regular stacking patterns.
2Reliability
If electrode materials are coated onto single foil and compressed, then manufacturing is simple, but electrode expansion and contraction cause reliability issues and short circuits
Solution Approach 1:
The electrode assembly is segmented into multiple discrete electrode layers (positive and negative electrodes) stacked alternately along a longitudinal axis. Each electrode layer is separated by microporous separators, creating a modular structure. This segmentation allows each layer to expand and contract independently during charging and discharging cycles, preventing stress concentration and electrical short circuits that occur in monolithic compressed structures, thereby improving reliability and cycle life.
3Quantity of substance
If three-dimensional architecture is implemented, then energy density increases, but manufacturing complexity increases
Solution Approach 1:
The patent combines multiple electrode layers, microporous separators, and constraint structures into a single integrated three-dimensional stacked assembly. The electrodes are stacked alternately along a longitudinal axis with separators between them, forming a compact unit that maximizes active material utilization. The constraint structure is integrated to maintain pressure on the entire assembly, preventing individual layer deformation. This merging approach enables the complex three-dimensional architecture to be manufactured as a unified structure, reducing assembly steps while achieving high energy density.
Data Source
AI summary
An energy storage device, the energy storage device including a constraint that maintains a pressure on a unit cell configured for energy storage, e.g., during use of the unit cell.