Because of its very high power capability, Li ion HEV technology promises to deliver and absorb the peak power pulses needed for HEV acceleration and braking with smaller (lower-kWh) batteries than NiMH. On the basis of their higher specific energy, Li ion batteries also would be preferred for plug-in HEVs, especially those with battery-only ranges of 40 mile and more. Cycle life requirements are substantially more demanding for HEV batteries, especially for applications in plug-in HEVs. Nevertheless, test data indicae that NiMH batteries have good prospects to meet the cycle life targets for PA/R HEVs and even for plug-in HEVs, especially if current electrode improvements become part of commercial NiMH technology. Indications are that Li ion batteries also can meet PA/R HEV cycling requirements, possibly even those for plug-in HEVs, but calendar life remains an issue. In mass production, the cost of the relatively small NiMH batteries needed for PA/R HEVs are likely to be acceptable; the commercialization of the INSIGHT and PRIUS hybrids attests to this. The NiMH battery costs projected for 20- and 40-mile plug-in HEVs are approximately dollar 2500 and nearly 5000, respectively. Even if Li ion batteries meeting performance and life requirements become available, their costs are unlikely to be less than those of NiMH HEV batteries.
Hybrid electric vehicle design options and their battery requirements
Entwurfsoptionen für elektrische Hybridfahrzeuge und deren Batterie-Anforderungen
2001
14 Seiten, 5 Bilder, 1 Tabelle, 5 Quellen
(nicht paginiert)
Conference paper
English
Hybrid/Electric Vehicle Design Options and Evaluations
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