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Battery Management for Maximum Performance in Plug-In Electric and Hybrid Vehicles

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1 Author(s)
Krein, P.T. ; Dept. of Electr. & Comput. Eng., Univ. of Illinois at Urbana-Champaign, Urbana, IL

Battery energy and power density are limiting factors in the design of electric and hybrid vehicle systems, particularly in the context of wide-range cycling needed for plug- in systems. Many commercial hybrid designs are controlled around specific operating conditions for long battery life. In this paper, battery management aspects for long operating life are discussed. Electrical considerations in valve-regulated lead-acid batteries, nickel-metal-hydride batteries, and lithium-ion batteries are described. Emphasis is provided on charge balancing requirements and state-of-charge operating ranges. The role of ultracapacitors for power buffering is addressed briefly. It is shown that lithium-ion cells offer considerable promise because of their high input-output energy efficiency and possibility of relatively wide operating range. Charge balancing is known to be a vital aspect, and balancing requirements are quantified for sample systems.

Published in:

Vehicle Power and Propulsion Conference, 2007. VPPC 2007. IEEE

Date of Conference:

9-12 Sept. 2007