Abstract
Flooded lead-acid battery dominates the emergency power supply system of nuclear power plants. However, Valve-Regulated Lead-Acid (VRLA) battery occupies important parts in emergency power supply systems. Structure design for internal consistency of big capacity is a challenge. Electrical variables of battery fluctuate as hysteresis while aging. This paper decouples terminal voltage in deep discharge by concentration polarization of electrolyte. Voltages of both bulk electrolyte capacitance and internal resistance are constants. This principle presents a novel model of dynamic threshold of contacting resistance. The model is sensitive to the battery nonlinear hysteresis. The model alarms remaining useful capacity at the end of service life. Parallel experiments at 4200 (Ah) VRLA batteries verifies the model. A Microchip embedded management board runs the algorithm.
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