|20Ah SCiB cell. Click to enlarge.|
Mitsubishi Motors Corporation has selected Toshiba Corporation’s SCiB battery (earlier post) to power two new models of electric vehicles (EV), the i-MiEV and MINICAB-MiEV. In July 2010, the two companies had announced they were working together to bring the SCiB batteries to EVs. (Earlier post.)
With lithium titanate oxide in the anode, the SCiB offers a high level operating safety, long life and rapid charging. The use of lithium titanate oxide also significantly reduces the possibility of a puncture in the separator between the anode and cathode, so minimizing the risk of them coming into contact and short circuiting, and maintains battery performance levels even in severe operating conditions, including very low temperatures, Toshiba says.
|SCiB module for automotive use. Click to enlarge.|
The SCiB supports 2.5 times more charge/discharge cycles than a typical lithium-ion battery, according to Toshiba. Charged with the highest current available with CHAdeMO, an SCiB reaches about 80% of full capacity in some 15 minutes, about 50% in 10 minutes and about 25% in 5 minutes for a 10 kWh pack—half the times of a typical lithium-ion battery charged under the same conditions. The SCiB also generates little heat while recharging, eliminating the need for power to cool the battery module.
The SCiB also offers a higher effective capacity than a typical lithium-ion battery, in that more of the stored charge can be used safely before recharging the battery. This, combined with highly efficient regenerative charging during braking or coasting downhill, allows the SCiB to deliver 1.7 times the driving distance per level of charge of a typical lithium-ion battery. This will allow for installation of smaller battery modules in vehicles and contribute to lower EV prices. The SCiB also offers high level performance in a wide range of temperatures, and continues to support rapid charging and excellent power output at temperatures as low as -30ºC.
The SCiB for Mitsubishi’s new EV will be manufactured at Toshiba’s Kashiwazaki Operations in Niigata prefecture, northwest Japan, a new facility dedicated to production of SCiB that came on line in February this year. Toshiba will seek to establish a plant operating structure able to respond quickly to market growth as the basis for expanding the SCiB business for EV, including hybrid and plug-in hybrid EVs.
As the automotive industry responds to concerns about global warming by developing a new generation of EVs, Toshiba is promoting advances in essential automotive technologies, from dedicated on-board control systems to batteries and Intelligent Traffic Systems. In automotive-related power electronics technologies, Toshiba is targeting net sales of 800 billion yen (US$10 billion) by fiscal year 2015 from its concentration on motors, inverters and SCiB.