Introduction: The Efficiency Code Behind Liquid Level Differences
In flow battery systems, the capacities of the electrolytes at the positive and negative electrodes must maintain a dynamic balance. Any persistent difference in liquid level
can indicate a decrease in ion exchange membrane selectivity or system leakage, directly leading to battery capacity degradation. Therefore, non-contact, synchronous liquid
level monitoring of the positive and negative electrolyte tanks is far more valuable than simply providing liquid volume information; it is crucial for diagnosing system health.
Unique Advantages of Capacitive Non-Contact Monitoring:
Absolute Isolation: Sensors are installed on the outer wall of the tank, completely physically isolated from corrosive electrolytes, eliminating the risk of contamination.
Data Purity: Non-contact measurement ensures that liquid level data accurately reflects the system status, unaffected by sensor corrosion or contamination.
High Consistency: Sensors of the same model have highly consistent output characteristics, ensuring comparability of liquid level data between the two tanks.
Real-Time Accuracy: Continuous analog signal output enables the BMS to calculate the liquid level difference in real time and generate trend charts.
Implementation Strategies and Intelligent Diagnosis:
Benchmark Establishment: A liquid level balance benchmark is established during initial system filling using sensors installed on the outer wall.
Trend Analysis: The BMS focuses on monitoring the trend of liquid level difference changes over time, promptly detecting anomalies.
Early Warning Linkage: When the liquid level difference exceeds a threshold, the system automatically issues an early warning, prompting maintenance intervention.
Conclusion: Through synchronous monitoring of the liquid levels in both tanks using non-contact capacitive level sensors, maintenance personnel can proactively grasp
the chemical balance state of the battery system, maximizing system energy efficiency and lifespan.
