Dielectric Breakdown Detector for HEV Battery Impedance Monitoring
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Solution Overview
Problem
Current methods for detecting electrolyte leaks in hybrid electric vehicle (HEV) battery systems rely on visual inspections and fluid level sensors, which are inadequate for early detection and may not accurately indicate dielectric housing integrity.
Innovation Solution
A circuit and method that measure the impedance of the battery dielectric housing using a signal generator, sensor circuit, and signal conversion module to generate output signals representing the impedance, allowing for the detection of leaks through changes in electrical impedance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If float switch or fluid level sensor is used to detect electrolyte level, then electrolyte level can be monitored, but early detection of dielectric housing leaks cannot be achieved
Solution Approach 1:
The patent applies preliminary action by measuring the electrical impedance of the dielectric housing before actual electrolyte leakage occurs. The system continuously monitors impedance changes that precede visible leaks, enabling early detection and prevention rather than waiting for float switch activation. This allows technicians to address potential issues before they result in actual electrolyte loss.
2Reliability
If visual inspection is used to determine dielectric housing integrity, then housing condition can be assessed, but accurate and timely leak detection is not achieved
Solution Approach 1:
The patent replaces manual visual inspection with an automated electrical impedance measurement system. Instead of relying on technicians to visually examine the dielectric housing, the system uses electrical signals to automatically detect changes in housing integrity. This substitution improves reliability while reducing the complexity of manual inspection procedures.
3Loss of information
If float switch is used to indicate electrolyte level, then level monitoring is provided, but accurate indication of dielectric housing integrity is not achieved
Solution Approach 1:
The patent introduces electrical impedance as an intermediary parameter that correlates with both electrolyte level and dielectric housing integrity. Rather than directly measuring housing integrity, the system measures impedance changes caused by electrolyte contact with the housing, providing indirect but accurate information about housing condition. This intermediary measurement enables reliable detection while maintaining ease of operation through automated sensing.
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 early and accurate detection of electrolyte leaks by differentiating between intact and leaking dielectric housings based on impedance measurements, improving the reliability of battery system monitoring and maintenance.
Implementation Method 1
A circuit and method that measure the impedance of the battery dielectric housing using a signal generator, sensor circuit, and signal conversion module to generate output signals representing the impedance
Data Source
AI summary
A circuit that indicates an impedance of a battery dielectric includes a signal generator module that flows a first current from a ground to a first terminal of a battery. A sensor circuit generates a signal based on a second current that flows from a second terminal of the battery through a resistance to ground. The second current includes the first current and a third current that flows to ground via an impedance presented by a battery dielectric housing. A signal conversion module generates an output signal based on the signal. The output signal represents the impedance presented by the battery dielectric housing.