TITLE:
Simulations of Electric Vehicle Driving Range and Battery Aging Using Experimental Data
AUTHORS:
Yiqun Liu
KEYWORDS:
Lithium-Ion Battery, Battery State Estimation, Powertrain Electrification
JOURNAL NAME:
Journal of Transportation Technologies,
Vol.13 No.3,
July
12,
2023
ABSTRACT: Driving range and battery aging, which are two important topics
considered by consumers when purchasing an electric vehicle, are studied in
this research. This research started with experiments on LiNiMnCoO2 battery cells. Experimental results of discharging voltage, OCV, and internal
resistance are obtained under different ambient temperatures. Cycle aging of
battery cells is also investigated by experiments. The obtained experimental
data is used to develop the battery pack model in the electric vehicle model as
well as the battery aging model. The developed electric vehicle model is used
to investigate electric vehicle’s driving range. Within the ambient temperature
range between -30°C to 50°C, the driving range decreases with the ambient
temperature. The driving range can also be heavily reduced by high-speed and
aggressive driving. By using the developed battery aging model, cycle aging of
the onboard battery of an electric vehicle after its 15,000-hour usage is
investigated. Simulation results show that battery cell has a quicker cycle
aging process under higher ambient temperatures. Large discharging and charging
currents involved in aggressive driving can also accelerate battery aging. In
addition, cycle aging of the onboard battery will be accelerated if the battery
is almost used up before recharging every time. This research presents a novel
approach to studying the driving range and battery aging of electric vehicles
and includes valuable results for automotive engineers and consumers of
electric vehicles.