3D Electrode Constraint Structure for Battery Cycle Stability
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional secondary batteries face reliability and cycle life issues 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 energy storage devices with a constraint that maintains pressure on the electrode assembly, inhibiting expansion and buckling by arranging electrode and counter-electrode structures in an alternating sequence and using compression and tension members to apply compressive forces, thereby enhancing energy density and retrieval rate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If conventional two-dimensional laminar battery architecture is used, then device simplicity is maintained, but energy density and active material utilization are limited
Solution Approach 1:
The patent transitions from conventional two-dimensional laminar battery architecture to a three-dimensional architecture where electrode structures extend vertically between current collectors. This dimensional change increases the surface area of active material per unit volume, thereby increasing energy density and active material utilization without fundamentally changing the basic battery components
2Reliability
If electrode materials are coated onto single foil and compressed, then manufacturing is simplified, but electrode expansion and contraction during cycling causes reliability issues
Solution Approach 1:
The electrode assembly is divided into multiple discrete electrode structures (positive and negative) stacked in alternating sequence with separators between them. This segmentation allows each electrode structure to be independently supported by the current collectors, reducing mechanical stress and improving reliability during cycling
Solution Approach 2:
The patent applies different structural characteristics to different parts of the electrode assembly. The electrode structures have specific geometric features (surface area to footprint ratio) that optimize both electrical performance and mechanical stability, with current collectors providing structural support at specific locations
3Quantity of substance
If three-dimensional electrode architecture is implemented, then energy density increases, but manufacturing precision requirements increase
Solution Approach 1:
The three-dimensional electrode architecture is designed with electrode structures that extend vertically between current collectors in a stacked arrangement. This configuration increases active material surface area and utilization while maintaining manufacturability through standardized stacking procedures
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution increases energy density and supports higher energy retrieval rates while minimizing electron and ion transfer distances, improving the reliability and cycle life of secondary batteries, especially in applications with limited geometric area.
Implementation Method 1
a constraint that maintains a pressure on the electrode assembly as the energy storage device is cycled between the charged and the discharged states
Implementation Method 2
carrier ions, such as lithium, sodium, potassium, calcium, magnesium or aluminum ions, move between a positive electrode and a negative electrode through an electrolyte
Implementation Method 3
an electrically insulating microporous separator material between members of the electrode and counter-electrode populations
Data Source
AI summary
A energy storage device for cycling between a charged state and a discharged state, the energy storage device including an enclosure, an electrode assembly and a non-aqueous liquid electrolyte within the enclosure, and a constraint that maintains a pressure on the electrode assembly as the energy storage device is cycled between the charged and the discharged states.