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| Ken-ichi Shimizu | |
| Head, Energy Eco-Use System Div., Dept. of Energy Engineering | |
| Mechanical Engineering Lab. AIST. MITI. | |
| 1-2 Namiki, Tsukuba, Ibaraki 305-8564, Japan | |
| Tel: +81-298-61-7062 Fax: +81-298-61-7275 | |
| E-mail: shimiken@mel.go.jp |
21,207,000 Yen
(FY 1999; 6,700,000 Yen)
Charging/discharging efficiency (including charger efficiency) is the one of the key factors that determines total energy efficiency of EV systems. The lifetime of battery banks is also the key factor to determine the environmental impacts of EV system from the viewpoint of life cycle Assessment (LCA). To improve LCA of EV system we proposed simple battery management system, and have studied how to use the system.
Results of charging/discharging test with the proposed simple battery management system showed that charging/discharging watt-hour efficiency is improved up to 90%.
Another key function of the battery management system is to estimate the state of charge (SOC) level of the battery under the normal driving conditions or charging conditions. We confirm the system ability of estimating SOC of the each cell under the mentioned conditions, through the simulated driving test conducted on chassis dynamometer.
Electric Vehicle, EV, Battery Management, Energy Economy