Introduction: Unique Challenges of Zinc-Based Systems
Zinc-based flow batteries have attracted attention due to their high energy density and low cost. However, the deposition/dissolution
behavior of zinc during charge and discharge presents unique challenges such as dendrite growth and shape changes, all of which are closely related to the electrolyte level and distribution.
Impact of Zinc Deposition on Liquid Level Monitoring
Liquid Level Fluctuations: Zinc deposition/dissolution during charging and discharging causes significant changes in electrolyte volume.
Sensor Contamination: Zinc dendrites may adhere to the surface of contact sensors, affecting measurements.
Uneven Distribution: Zinc deposition can lead to uneven electrolyte distribution, requiring multi-point monitoring.
Optimized Monitoring Strategies
Non-Contact Monitoring: Capacitive sensors are installed externally to the container, completely avoiding the impact of zinc deposition.
Multi-Point Layout: Monitoring points are set at key nodes in the electrolyte circulation path.
Dynamic Threshold: Liquid level alarm thresholds are adjusted based on SOC to adapt to volume changes.
Deep Integration with BMS
Through collaborative analysis of liquid level signals and current and voltage parameters, the BMS can:
Optimize charging and discharging strategies to prevent dendrite formation
Adjust operating parameters when abnormal liquid level changes are detected
Predict maintenance cycles and perform timely equalization processing
Conclusion
Liquid level monitoring in zinc-based flow batteries is not only a safety guarantee but also crucial for
improving cycle life. Intelligent liquid level management can effectively suppress zinc dendrite growth, promoting the commercialization of this technology.
