Battery Impedance Monitoring for Abnormality Detection Across Rest States
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Solution Overview
Problem
Existing battery management systems face inefficiencies in accurately detecting abnormalities in secondary batteries, particularly during rest periods and constant current operation sections, using equivalent circuit models (ECM).
Innovation Solution
A battery management system that utilizes electrochemical impedance spectroscopy (EIS) to measure impedance in various operation sections, expressing results as Nyquist or polar coordinate systems, and calculates real intercepts to determine abnormalities, complemented by ECM estimation where necessary.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If an equivalent circuit model (ECM) is used to estimate impedance, then the method is simple to implement, but it cannot accurately detect abnormalities in rest periods and constant current operation sections
Solution Approach 1:
The patent changes the detection parameter from current-based ECM estimation to voltage-based EIS measurement. By applying small AC voltage signals and measuring impedance responses across different frequencies, the system can detect abnormalities in all operation sections including rest periods and constant current sections where traditional ECM fails.
Solution Approach 2:
The patent replaces the mechanical/electrical ECM estimation approach with an electrochemical impedance spectroscopy (EIS) measurement approach. This substitution enables accurate abnormality detection by measuring the battery's electrochemical properties directly through impedance analysis rather than relying on current-change-based models.
2Measurement precision
If electrochemical impedance spectroscopy (EIS) measurement is performed, then abnormality detection accuracy is improved, but the device complexity increases
Solution Approach 1:
The battery management system integrates multiple functions into a single EIS measurement module that can operate across all battery operation sections (charging, discharging, rest periods). This multi-functional approach eliminates the need for separate detection systems for different operation modes, thereby reducing overall system complexity despite the advanced measurement capability.
Solution Approach 2:
The patent introduces an intermediary signal processing approach where small AC voltage signals are superimposed on the battery's operating voltage. This intermediary measurement method allows EIS data acquisition without significantly disrupting normal battery operation, enabling accurate detection while maintaining system simplicity through non-intrusive measurement.
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
Accurately detects abnormalities in secondary batteries across all operation sections, enhancing detection efficiency and accuracy, especially in rest periods and constant current operations.
Implementation Method 1
an EIS measurement module configured to measure an EIS of a secondary battery
Data Source
Figure 1
Figure 2
Figure 3A~3B
AI summary
The present disclosure relates to a battery management system and a method for controlling the same. The battery management system according to an embodiment of the present disclosure may include an alarm module configured to provide an alarm in a designated manner; an electrochemical impedance spectroscopy (EIS) measurement module configured to measure an EIS of a secondary battery; and a processor configured to receive an EIS measurement result from the EIS measurement module, calculate real intercepts of impedance values for the secondary battery based on the received EIS measurement result, determine whether the secondary battery is abnormal based on the calculated real intercepts, and control the alarm module to provide an alarm notifying that the secondary battery is abnormal if there is an abnormality in the secondary battery as a result of the determination. The present disclosure may improve the accuracy and/or efficiency in abnormality detection of the secondary battery.