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A SYSTEM FOR STATE-OF-HEALTH DIAGNOSIS OF LEAD-ACID BATTERIES INTEGRATED WITH A BATTERY CHARGER
Author Telles B. Lazzarin1 and Ivo Barbi
Abstract – This paper reports a theoretical and
experimental study on a proposal for a lead–acid battery
charger applied in UPS, which has an integrated on-line
test system to determine the state-of-health (SoH) of the
batteries. The charger control structure is designed to
ensure an appropriate charge for every battery in the
pack. The battery evaluation system is based on historical
analysis of the periodic measurements, such as internal
impedance, DC voltage and operation temperature,
performed for each battery. The periodic monitoring of
these parameters provided by the integration of systems
eliminates the disadvantages of online tests and thus
allows the user to analyze the batteries adequately. The
structure was experimentally verified on a prototype,
where the battery SoH diagnosis system was integrated
with a 1.5 kW battery charger. The system was designed
for a bank of sixteen batteries associated in series.
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