Toyota Motor Corp's new "Camry" sedan with specifications set for the Japanese market is equipped with a lithium-ion (Li-ion) battery as a battery for its hybrid system.
Some models of the Camry designed for the North American market are equipped with a nickel-metal-hydride (NiMH) battery. The different batteries are used for different fuel efficiencies.
For the Japanese model, which is a hybrid vehicle (HEV), Toyota made improvements to the "THS II" hybrid system designed for FF (front-engine, front-wheel-drive) vehicles and combined a 2.5L in-line four-cylinder direct-injection gasoline engine and a Li-ion battery with a capacity of about 1.0kWh. The Li-ion battery pack consists of 70 cells and has a voltage of 259V. The current capacity of the battery cell is 4.0Ah. Panasonic Corp supplies the battery.
Toyota's Prius HEV, which is one size smaller than the Camry, uses 56 Li-ion battery cells (capacity: 3.6Ah each), and its voltage is 207.2V. The cell is manufactured by Primearth EV Energy Co Ltd (PEVE). The Camry is wider than the Prius and, therefore, uses a larger number of battery cells. As in the case of the Prius, the battery pack of the Camry is located under the rear seats.
While Toyota employed a Li-ion battery for the Japanese model, some of the North American models come with a NiMH battery. Specifically, a Li-ion battery is used for the "HV LE" grade, which puts emphasis on fuel efficiency, while a NiMH battery is used for other grades. The weight of the Li-ion battery is about 15kg lighter than that of the MiMH battery, contributing to weight reduction, the company said.
The NiMH battery pack for the North American model of the new Camry is manufactured by PEVE and consists of 204 cells with a capacity of 6.5Ah each. Its voltage is 244.8V. The cell is the same as that of the Prius. In the case of the Prius, the number of battery cells is 168, and its voltage is 201.6V.