Modeling of Battery Degradation in Electrified Vehicles
This thesis provides an insight into battery modeling in electric
vehicles which includes degradation mechanisms as in automotive
operation in electric vehicles. As electric vehicles with lithium ion
batteries increase in popularity there is an increased need to study
and model the capacity losses in such batteries. If there is a good
understanding of the phenomena involved and an ability to predict
these losses there is also a foundation to take measures to minimize
these losses.
In this thesis a battery model for lithium ion
batteries which includes heat dissipation is used as groundwork. This
model is expanded with the addition of capacity losses due to usage as
well as storage. By combining this with a simple vehicle model one can
use these models to achieve an understanding as to how a battery or
pack of several batteries would behave in a specific driving
scenario. Much of the focus in the thesis is put into comparing the
di↵erent factors of degradation to highlight what the major
contributors are.
The conclusion is drawn that heat is the main cause
for degradation for batteries in electric vehicles. This applies for
driving usage as well as during storage. As heat is generated when a
battery is used, the level of current is also a factor, as well as in
which state of charge region the battery is used.
Olof Juhlin
2016
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Last updated: 2021-11-10
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