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The lack of uniformity in battery characteristics in the battery bank further limits the effective capacity of the bank, shortening its life. We propose the individual management of battery cells, and discuss the results of trial runs using a microprocessor-based prototype system. The test run was conducted on a chassis dynamometer using a micro-EV. The system's battery current and the voltage and temperature of individual battery cells are monitored by random sampling during driving and recharging.
9632307 Development of a Lithium-Ion Battery Pack System for EVs Hidcaki Horie, Yuuji Tanjo, Takeshi Miyamoto (Nissan Motor Co., Ltd.), Yasunobu Koga (Sony Corporation)
The lithium-ion battery has been commercialized in recent years mainly for use in small electric products. We have been researching energy sources for EV use that offer high levels of specific energy, specific power, cycle life and reliability. Among the many types of secondary batteries studied, a lithium-ion battery pack system with a cell control mechanism was developed and evaluated for possible application to EVs. Experimental results show that it provides 100 Wh/kg of specific energy, almost three times as much as conventional lead-acid batteries, nearly 300 W/kg of specific power, 1.5 times more than other batteries, and a cycle life greater than several hundred. This system thus shows the most promising features as a potential energy source for EVs.
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