Battery Impedance Spectrum Generation from Discharge FFT Signals
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Solution Overview
Problem
Existing methods for measuring electrochemical impedance spectra for batteries, such as those used in lithium batteries, are time-consuming and require large installations due to the use of electrochemical workstations.
Innovation Solution
A method involving periodic collection of battery discharge information, Fourier transform, and fast Fourier transform to determine effective frequency-based signals, allowing for the construction of an electrochemical impedance spectrum directly from battery discharge data, reducing the need for external devices and enabling faster, more flexible, and accurate impedance measurements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If electrochemical workstation is used to measure electrochemical impedance spectrum, then measurement accuracy is maintained, but measurement time is long and installation space is large
Solution Approach 1:
The patent replaces the traditional electrochemical workstation (mechanical/electrical measurement system) with a signal processing method using Fast Fourier Transform. The system collects battery discharge data and processes it through FFT algorithms to obtain impedance spectrum, substituting complex physical measurement equipment with computational methods that run on standard computer hardware.
Solution Approach 2:
The patent creates a computational model that replicates the function of the electrochemical workstation. By collecting voltage and current data during battery discharge and processing these signals through FFT, the system generates an impedance spectrum that copies the output of traditional measurement equipment without requiring the actual measurement device.
2Measurement precision
If electrochemical workstation is used to measure electrochemical impedance spectrum, then measurement accuracy is maintained, but installation space is large
Solution Approach 1:
The patent replaces the physical electrochemical workstation with a software-based signal processing system. The measurement function is transferred from specialized hardware to computational algorithms running on general-purpose computers, eliminating the need for dedicated measurement equipment and its associated installation space.
Solution Approach 2:
The patent enables standard computer equipment to perform the function previously requiring specialized electrochemical workstations. The same computer hardware can be used for both general computing tasks and electrochemical impedance spectrum analysis, making the system universally applicable without requiring dedicated measurement equipment.
3Loss of information
If traditional measurement method is used, then comprehensive impedance data is obtained, but measurement process is complex and time-consuming
Solution Approach 1:
The patent collects battery discharge data continuously throughout the discharge process, capturing voltage and current information at multiple time points. This continuous data collection during normal battery operation allows for complete impedance spectrum extraction without interrupting the useful discharge action, thereby maintaining data completeness while improving efficiency.
Solution Approach 2:
The patent performs Fast Fourier Transform processing on the collected discharge data to pre-calculate and store impedance spectrum information. This preliminary processing of the raw voltage and current data converts it into useful impedance characteristics that can be quickly retrieved and analyzed without requiring time-consuming measurements at the time of use.
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 method allows for the construction of an electrochemical impedance spectrum with high accuracy and feasibility, consistent with traditional methods, while significantly reducing measurement time and space requirements, and enabling universal application in various scenarios.
Implementation Method 1
performing Fourier transform according to the collection interval and the battery discharge information, to obtain multiple frequency-based first battery signals
Data Source
AI summary
A method for generating an electrochemical impedance spectrum for a battery includes: collecting, in a discharge state of a battery, battery discharge information of the battery periodically according to a preset collection interval, where the battery discharge information includes collection time, and current information and voltage information associated with the collection time; performing Fourier transform according to the collection interval and battery discharge information, to obtain multiple frequency-based first battery signals; determining a second battery signal from the multiple first battery signals, where the second battery signal includes a voltage signal greater than or equal to a preset voltage threshold; and determining an electrochemical impedance at a corresponding frequency according to the second battery signal, and constructing an electrochemical impedance spectrum according to all the electrochemical impedance.