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Ovonic Nickel-Metal Hydride Batteries for Electric Vehicles
Published June 01, 1997 by ISATA - Dusseldorf Trade Fair in United Kingdom
Event: ISATA 1997
Ovonic Nickel-Metal Hydride (NiMH) batteries have an exceptional energy and power performance that can provide for electric vehicles with a range and acceleration performance comparable to that of internal combustion engine vehicles. A range of 375 miles was demonstrated in the 1996 Tour de Sol with a Solectria Sunrise production prototype electric vehicle powered by Generation 1 Ovonic NiMH batteries with a specific energy of 73 Wh/kg and a volumetric energy density of 175 Wh/L. Even higher energy density Ovonic batteries are now available. A new generation of 80 Wh/kg EV batteries exhibits a volumetric energy density of 225 Wh/L. Prototype Ovonic NiMH electric vehicle cells have demonstrated a specific energy of 94 Wh/kg and an energy density of 290 Wh/L. Acceleration from 0 to 60 mph in under 8 seconds has been demonstrated in a General Motors Impact electric vehicle powered by Generation 1 Ovonic batteries with a power capability of about 200 W/kg and 500 W/L. The power performance of prototype EV cells has been increased to about 300 W/kg and nearly 1000 W/L with no sacrifice in specific energy. Prototype cells for hybrid EV applications have demonstrated 500 W/kg and 1500 W/L. In bench durability tests, over 2000 charge-discharge to 40% DOD cycles have been attained from Generation 1 battery modules. Real-world tests have demonstrated excellent robustness and durability in the field over a variety of conditions. Around 200,000 total vehicle test miles on a wide variety of vehicles have provided a wealth of experience leading to improved vehicle integration and battery system design. The durability and ruggedness of this unique system provides a battery with the intrinsic capability to last the life of the vehicle.