Toyota Motor Corporation has developed the new model hybrid SUV RX400h and Highlander Hybrid this year, following the Prius 2003 model to respond to the market demand for environmental friendly vehicle. By incorporating the new Toyota Hybrid System II (THS II), the Hybrid SUV models offer a new battery system that is the most important unit in the hybrids. In order to satisfy the requirement for installability as well as cooling performance, the new battery system is designed to improve the packaging and the cooling System and to reduce the size of battery. The authors show the newly developed battery module for hybrid SUV. This HV battery module now adopts a metal casing and a new structure that welds the electrodes directly to the battery case and the positive terminal, which allows to eliminate the connecting space between the electrodes and so achieve a 10% reduction in battery height over the previous model. Though the newly developed battery is reduced in size it maintains the same output as the current model. By reducing the size it is able to increase the volumetric output density by 30% and realized the highest specific output in the world. Moreover, the paper shows the specifications for the battery module. The 1997 model Prius was equipped with 6 cells inline cylindrical Ni-MH battery module. The 2000 model improved to 6 cells inline prismatic Ni-MH battery module in a plastic case. In the 2003 model, the internal electrical resistance was reduced by modifying the cell interconnection. A similar reduction an internal electrical resistance was achieved in the newly developed battery module by using two separate positive terminals. Additionally, since the cells operate independently in the new model, those cells can be located freely so that the latest model features 8 cells in series.
Development of new battery system for hybrid vehicles
Entwicklung neuer Batteriesysteme für den Einsatz in Hybridfahrzeugen
2005
6 Seiten, 13 Bilder, 1 Tabelle, 2 Quellen
(nicht paginiert)
Conference paper
English
Development of a new battery system for hybrid vehicles
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