THESIS
2014
xv, 91 pages : illustrations (some color) ; 30 cm
Abstract
Electric vehicles (EVs) are projected as one of the most sustainable selections for future
transport. At present stage, one of the key factors restricting EV development is the stability
of power battery. During the battery discharge process, significant temperature rise comes
along with the uneven temperature distribution of the battery pack, which could reduce the
battery longevity as well as the performance. To control the temperature variance and
elevation, effective thermal management system has to be applied on the EV battery pack.
In this thesis, a 3D thermal model of lithium-ion battery pack is developed to simulate the
thermal behaviors of the EV power battery in the working status. A set of battery physical
characteristics experiments have been conducted to determine t...[
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Electric vehicles (EVs) are projected as one of the most sustainable selections for future
transport. At present stage, one of the key factors restricting EV development is the stability
of power battery. During the battery discharge process, significant temperature rise comes
along with the uneven temperature distribution of the battery pack, which could reduce the
battery longevity as well as the performance. To control the temperature variance and
elevation, effective thermal management system has to be applied on the EV battery pack.
In this thesis, a 3D thermal model of lithium-ion battery pack is developed to simulate the
thermal behaviors of the EV power battery in the working status. A set of battery physical
characteristics experiments have been conducted to determine the thermal related
parameters of the model. Then the battery pack thermal model is simulated with varying
ambient temperatures and discharge rates for the purpose of analyzing the effects of the EV
working conditions to the battery pack temperature distribution. Through the battery pack
temperature field experiments, the local temperature of the characteristic points is measured,
which helps to determine the overall thermal profile and temperature rise rate of the battery
pack. Based on the simulation and experimental results, a battery box structure with a new
air cooling approach is designed, which is able to improve the heat dissipation efficiency
and the temperature uniformity of the battery pack.
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