Peak power estimation of traction battery pack used in HEVs

Description/Abstract

Battery peak power capability estimation has an
important theoretical significance and utility value for proper
use of a battery and to help extend its lifetime. It is an important
part of a battery management system. The paper presents an
algorithm for estimating the dynamic peak power capability of a
battery pack. The algorithm is based on a dynamic battery
model taking into consideration constraints of rated, current,
voltage and state of charge. The suitability of alternative
equivalent circuit models for lithium-ion batteries was also
analyzed. It is shown that using Thevenin’s model, the estimation
algorithm could compute the dynamic battery peak power in
real-time and could provide real-time estimates of the charged
and discharged power in an electric vehicle so that the battery
may be used within its safe operating limits.