Cyclic Voltammetry Aging Detection for Electrochemical Storage
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing methods for determining the aging of electrochemical storage devices, such as lithium-ion cells, often require decoupling from their intended operation and involve full charging and discharging cycles, which are inefficient and disruptive.
Innovation Solution
A method using cyclic voltammetry to record and compare first and second voltammograms, determining aging by analyzing the difference in extreme values, allowing for remote access and prediction of aging without disrupting the device's operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If full charge and discharge cycles are used to determine aging, then aging determination is possible, but the device must be disconnected from intended operation causing operational disruption
Solution Approach 1:
The patent extracts only the essential measurement information (voltammogram extreme values) needed for aging determination, allowing aging assessment without requiring complete charge-discharge cycles. This enables continuous operation while obtaining sufficient data for accurate aging measurement.
Solution Approach 2:
Instead of performing full charge and discharge cycles, the method uses partial cyclic voltammetry measurements that capture only the extreme values needed for aging determination. This partial action approach provides sufficient information for aging assessment while minimizing operational disruption.
2Measurement precision
If multiple full cycles are performed for aging determination, then comprehensive aging data is obtained, but measurement time and operational downtime increase
Solution Approach 1:
The method extracts only the critical extreme values from voltammograms that are sufficient for aging determination, eliminating the need for multiple complete cycles. This extraction approach maintains measurement accuracy while dramatically reducing the time required.
Solution Approach 2:
The extreme values are determined directly from cyclic voltammetry measurements without requiring subsequent full cycles. This preliminary action captures all necessary aging information in a single measurement phase, avoiding repeated cycling.
3Measurement precision
If cyclic voltammetry is performed frequently for continuous monitoring, then real-time aging data is available, but additional stress and potential additional aging of the device occurs
Solution Approach 1:
The method performs only partial cyclic voltammetry measurements to extract extreme values, applying minimal necessary stress to obtain aging data. This partial action approach enables continuous monitoring while keeping the induced aging stress to a minimum.
Solution Approach 2:
The patent replaces mechanical/electrical stress-intensive full cycling with electrochemical cyclic voltammetry that operates at lower intensities. This substitution reduces the harmful stress on the device while still providing continuous aging monitoring capability.
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
Enables efficient determination of electrochemical storage aging during intended operation, reducing additional stress on the device and allowing for optimized operation, with clear correlation between extreme value changes and aging, enhancing operational safety and efficiency.
Implementation Method 1
Determination of a first voltammogram by means of cyclic voltammetry at a first time point; determination of a second voltammogram by means of further cyclic voltammetry at a second time point later than the first time point
Data Source
Figure 1~2
AI summary
The invention relates to a method for determining the ageing S0H of an electrochemical storage means, comprising the following steps: determining a first voltammogram (11, 12) by means of a cyclic voltammetry at a first time; determining a second voltammogram (21, 22) by means of a further cyclic voltammetry at a second time that is later in relation to the first time; determining a first extreme value (41) in the first voltammogram (11, 12) and a second extreme value (42) in the second voltammogram (21, 22), wherein at least one voltage U1, U2 and a current strength I1, I2 belongs to each extreme value (41, 42); and determining the ageing S0H of the electrochemical storage means in accordance with a different between the first and second extreme value (41, 42).