TY - GEN
T1 - Management of large format liion batteries
AU - Sundaram, Saravanan Meenatchi
AU - Kulkarni, Mukund
AU - Diwakar, Vinten
PY - 2016/1/19
Y1 - 2016/1/19
N2 - Electric vehicles (EVs) are expected to play an important role in sustainable mobility thanks to the efficient energy utilization and zero-emission when in use. The battery has a great impact on the performance of electric vehicles, basically determining the driving range. As a consequence, the choice of the battery technology and its effective utilization is of paramount importance. Li-ion chemistry is very sensitive to overcharge and deep discharge, which may damage the battery, shortening its lifetime, and even causing hazardous situations. This requires the adoption of a proper Battery Management System (BMS) to maintain each cell of the battery within its safe and reliable operating range. In addition to the primary function of battery protection, a BMS should estimate the battery status in order to predict the actual amount of energy that can still be delivered to the load. This is quite a challenging task, as the performance of the battery in terms of usable capacity and internal resistance, varies over time. Another important function of a BMS is to extend the battery life by facing the charge unbalancing issue that may arise in series-connected cells. This reduces the usable capacity of the battery. Due to the strict voltage limits applying to Li-ion batteries, charge unbalancing cannot be self-recovered, but instead worsens with time. A BMS should thus implement a charge equalization technique to periodically restore the balanced condition. The purpose of this paper is to describe the main issues in the design and management of a battery for an electric vehicle. The paper covers aspects BMS requirements and architectures and techniques for charge equalization.
AB - Electric vehicles (EVs) are expected to play an important role in sustainable mobility thanks to the efficient energy utilization and zero-emission when in use. The battery has a great impact on the performance of electric vehicles, basically determining the driving range. As a consequence, the choice of the battery technology and its effective utilization is of paramount importance. Li-ion chemistry is very sensitive to overcharge and deep discharge, which may damage the battery, shortening its lifetime, and even causing hazardous situations. This requires the adoption of a proper Battery Management System (BMS) to maintain each cell of the battery within its safe and reliable operating range. In addition to the primary function of battery protection, a BMS should estimate the battery status in order to predict the actual amount of energy that can still be delivered to the load. This is quite a challenging task, as the performance of the battery in terms of usable capacity and internal resistance, varies over time. Another important function of a BMS is to extend the battery life by facing the charge unbalancing issue that may arise in series-connected cells. This reduces the usable capacity of the battery. Due to the strict voltage limits applying to Li-ion batteries, charge unbalancing cannot be self-recovered, but instead worsens with time. A BMS should thus implement a charge equalization technique to periodically restore the balanced condition. The purpose of this paper is to describe the main issues in the design and management of a battery for an electric vehicle. The paper covers aspects BMS requirements and architectures and techniques for charge equalization.
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U2 - 10.1109/ITEC-India.2015.7386883
DO - 10.1109/ITEC-India.2015.7386883
M3 - Conference contribution
AN - SCOPUS:84965157553
T3 - 2015 IEEE International Transportation Electrification Conference, ITEC-India 2015
BT - 2015 IEEE International Transportation Electrification Conference, ITEC-India 2015
PB - Institute of Electrical and Electronics Engineers Inc.
T2 - IEEE International Transportation Electrification Conference, ITEC-India 2015
Y2 - 27 August 2015 through 29 August 2015
ER -