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VRF Battery Characterization Using Microwave Planar Complementary Split Ring Resonators
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DOI：10.1109/CCECE53047.2021.9569119.png)
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Abstract
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The oxidation states of vanadium redox flow battery electrolytes need to be rebalanced for sustainable long term energy storage and battery performance monitoring. To achieve this, a complementary split-ring resonator is designed at 5.26 GHz to monitor the state of the charge of each electrolyte continuously in situ during battery operation. Sensor performance was tested on a 40 cell, 2.5 kW stack utilizing 40 L of electrolyte. Battery cycling was performed between 62 V-30 V (terminal voltage) with a max charge/discharge current of 40 A/45 A respectively. The transmission notch of the resonator measures resonance amplitude variation of similar to 1 dB during charging cycle with - 0.04 dB incertitude.
Keywords:
VRF batteries
SOC
renewable energy
CSRR
microwave sensor
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