Battery Impedance Diagnosis for Early High-Voltage Defect Detection
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Solution Overview
Problem
Conventional high-voltage battery failure diagnosis systems are inadequate in detecting defects that could be fatal, as they fail to reflect detailed internal battery characteristics, leading to potential safety issues such as vehicle fires.
Innovation Solution
A battery diagnosis system using electrochemical impedance spectroscopy to measure impedance across various frequency bands, allowing for the detection of abnormal battery conditions before they become critical, thereby preventing potential vehicle fires.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional insulation resistance and cell voltage difference methods are used for battery diagnosis, then the diagnosis system is simple to operate, but the measurement precision is insufficient to detect fatal defects
Solution Approach 1:
The patent applies parameter changes by transitioning from conventional DC-based diagnosis parameters (insulation resistance, cell voltage difference) to AC impedance parameters across multiple frequency bands. This enables detection of internal battery characteristics that DC measurements cannot capture, thereby improving defect detection capability while maintaining system operability through standardized measurement protocols
2Loss of information
If battery characteristics (current/voltage/temperature) are measured alone, then the measurement process is simple, but the information completeness is insufficient to reflect detailed battery interior characteristics
Solution Approach 1:
The patent applies segmentation by dividing the impedance measurement into multiple frequency bands (e.g., low frequency, medium frequency, high frequency). Each frequency band provides different information about battery interior characteristics, allowing comprehensive analysis of electrode processes, electrolyte behavior, and interfacial phenomena without requiring complex invasive sensors
3Measurement precision
If battery diagnosis is performed during parking with sufficient inspection time, then the measurement accuracy is improved, but the response time for detecting emerging defects is delayed
Solution Approach 1:
The patent applies preliminary action by performing impedance spectroscopy measurements during parking periods when the battery is in a stable, unloaded state. This timing allows comprehensive frequency-sweep measurements to be completed without interfering with vehicle operation, capturing early signs of battery degradation before they progress to critical failures
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 system effectively identifies abnormal battery conditions, maximizing battery life, predicting charge state, and preventing vehicle fires by pre-diagnosing malfunctions through detailed internal characteristic analysis.
Implementation Method 1
An electrochemical impedance spectroscopy refers to a method for applying weak AC signals having different frequencies to a cell and measuring the impedance thereof
Data Source
AI summary
The present disclosure relates to a battery diagnosis system including a processor configured to: receive high-voltage battery information of a parked car; measure impedance of a battery through the received battery information; and determine, based on a comparison between a normal battery impedance and an abnormal battery impedance, that a battery having an abnormal battery impedance is an abnormal battery.