Electrochemical Energy Storage Age Determination via Voltage Curve Comparison
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Solution Overview
Problem
Existing methods for determining the age of electrochemical energy storage systems, such as lithium-based batteries, often require decoupling from regular operation, cause additional aging, and are energy-intensive, making them inefficient and disruptive to system operation.
Innovation Solution
A procedure involving the comparison of initial and subsequent resting voltage curves to determine the age of the electrochemical energy storage, allowing for precise calculation of calendar and cyclical aging with minimal intervention and energy consumption, using an area between the curves as a measure of aging, and incorporating a proportional factor for time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If impedance spectroscopy or charging/unloading cycles are used to determine age, then measurement precision is improved, but the electrochemical energy storage must be decoupled from regular operation and additional aging is caused
Solution Approach 1:
The method uses the electrochemical energy storage's own operating voltage data during normal operation to determine its age. The control device continuously records voltage values at different states of charge and automatically performs the age determination without external intervention or decoupling from the system's regular function.
Solution Approach 2:
The system pre-stores a reference curve showing the relationship between state of charge and voltage for a new electrochemical energy storage. During operation, it compares current voltage measurements against this pre-established reference to continuously monitor aging without requiring separate measurement procedures.
2Measurement precision
If impedance spectroscopy or charging/unloading cycles are used to determine age, then measurement precision is improved, but energy consumption increases
Solution Approach 1:
The method utilizes the electrochemical energy storage's inherent voltage characteristics during normal operation to determine its age. No additional energy input is required beyond what is already consumed during regular charging and discharging cycles, as the system analyzes voltage data that naturally occurs during operation.
Solution Approach 2:
The age determination process occurs continuously during normal operation without interrupting the charging or discharging cycles. The control device monitors voltage values in real-time and performs comparisons with the reference curve, eliminating the need for separate energy-consuming measurement procedures.
3Measurement precision
If selective determination procedures are used to determine age, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The control device performs multiple functions using the same voltage measurement data: it monitors the state of charge, tracks operational status, and determines the age of the electrochemical energy storage. This universal approach eliminates the need for separate specialized measurement systems while maintaining high measurement precision.
Solution Approach 2:
The method combines the age determination process with the existing operational monitoring system. By merging the reference curve comparison with routine voltage measurements already performed during charging and discharging, the system achieves precise age determination without adding separate complex measurement procedures.
Data Source
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AI summary
The invention relates to a method for determining the age of an electrochemical energy storage unit, having at least the following steps: - providing a first open-circuit voltage curve (201) of the electrochemical energy storage unit as a reference, said open-circuit voltage curve depending on the charge state of the electrochemical energy storage unit; - ascertaining a second open-circuit voltage curve (202) of the electrochemical energy storage unit, said open-circuit voltage curve depending on the charge state of the electrochemical energy storage unit; and - determining the age of the electrochemical energy storage unit by comparing the first and second open-circuit voltage curve (201, 202). The invention additionally relates to an electrochemical energy storage unit and to an airplane which comprises the electrochemical energy storage unit according to the invention.