Battery Electrode Crack Detection Through Impedance Spectroscopy
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Solution Overview
Problem
Existing methods for identifying cracks in secondary battery electrodes require destructive analysis, which leads to battery disposal and are time-consuming, making them unsuitable for real-time monitoring.
Innovation Solution
A non-destructive battery inspection method using impedance spectroscopy to analyze impedance spectral data, fitting a first function and differentiating it to determine a second function, allowing for crack detection in electrodes without disassembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If electron microscopy is used to identify cracks in electrodes, then measurement precision is improved, but the battery must be disassembled and discarded, resulting in loss of the object and extended analysis time
Solution Approach 1:
The patent replaces the mechanical disassembly process with electrical impedance spectroscopy measurements. Instead of physically opening the battery to extract electrodes for electron microscopy, the invention uses non-destructive electrical measurements to detect cracks through the battery's external terminals, thereby preserving battery usability while maintaining crack detection capability
Solution Approach 2:
The patent introduces impedance spectral data as an intermediary between the crack defect and the measurement system. By measuring impedance across different frequencies and analyzing spectral characteristics, the method indirectly detects cracks without direct visual inspection or physical disassembly, enabling non-destructive evaluation
2Measurement precision
If electron microscopy is used to analyze electrode cracks, then measurement precision is improved, but analysis time is extended due to cumbersome sample preparation
Solution Approach 1:
The patent performs preliminary impedance spectral measurements on the battery in its assembled state before any disassembly is required. By collecting impedance data across multiple frequencies in advance and fitting appropriate functions to this data, the method prepares analysis results without requiring subsequent time-consuming sample preparation steps
Solution Approach 2:
The invention substitutes the time-consuming mechanical sample preparation process with automated electrical impedance measurements and computational analysis. The entire crack detection process can be performed through external electrical connections, eliminating the need for battery disassembly, electrode extraction, mounting, and imaging preparation
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 rapid identification of cracks in secondary battery electrodes in about seven minutes, preserving the battery for further use and providing immediate feedback.
Implementation Method 1
acquiring impedance spectral data for a secondary battery; applying alternating current power to the secondary battery at the input frequency of 10−2 Hz to 105 Hz
Data Source
AI summary
Battery inspection methods are provided. The provided battery inspection methods include battery inspection methods which comprise: a data acquisition step of acquiring impedance spectrum data for a finished secondary battery in order to identify cracks in the electrodes of the secondary battery through non-destructive inspection; a first function acquisition step of acquiring a first function, having the log scale of the measurement frequency as an independent variable and the absolute value of impedance as a dependent variable, from the impedance spectrum data through function fitting; a second function acquisition step of acquiring a second function by differentiating the first function with respect to the log scale of the measurement frequency; and a battery state determination step of determining the state of the secondary battery on the basis of the second function.