A simple mathematical model is presented and used to analyze the potential and current distributions in a HORIZON | sealed lead-acid battery. It was found that an increase in the thickness of an electrode would not enhance the discharge rate of that electrode; instead, it causes the transfer current distribution to be less uniform in the electrode. Also, the ohmic drop across the separator would decrease with a decrease in the thickness of the separator more rapidly when the thickness is small than when it is large. In addition, it was found that efficient high-capacity, high-rate electrodes must consider the electrode reaction kinetics because of the high sensitivity of transfer current distribution to the reaction kinetics.
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INTRODUCTIONUsing n e w lead-composite materials and innovative cell-design and packaging design rules, Electrosource has developed a highspecific-energy, long-cycle-life, valve-regulated lead-acid battery.This paper presents performance and cycle-life data for this revolutionary n e w design.Specific energy exceeds 40 Whrs/kg at C/2. Under sustained moderately-high current density loads, specific power exceeds 300 W/kg at 100 % state of charge, and 2 5 0 W/kg at 5 0 % depth of discharge. C/2 cycle life exceeds 900 cycles under constant current discharge t o an average depth of discharge > 80% with recharge time < 3 hours.
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