Research on Analytical Model of LiFePO4 Positive Material Li-ion Battery Considering Self Heating Effects

Abstract

As a new kind of power Li-ion battery, The LiFePO4 positive material Li-ion battery
performance is much more better than that of traditional battery. In order to incorporate
actual battery state information into a power management model and optimize battery
management and operation, the analytical model of LiFePO4 positive material Li-ion battery
was studied. An analytical battery model of LiFePO4 positive material Li-ion battery
considering self heating effects was established and developed. The model was
comprehensively validated for Li-ion batteries with LiFePO4 positive electrode materials at
different operating temperatures. Some of the model parameters can be easily achieved from
suppliers and some other parameters can be estimated from relatively simple experiments
design. The modeling and experimental dynamic response at charging/discharging cycles
with different current, temperatures, charging-rest period have been comprehensively
compared. The research suggested that the model’s results of the dynamic performance for
LiFePO4 batteries consistent with the laboratory finding very well and the biggest problem
can be controlled less then ±10% at 40℃, 25℃, 0℃ and -10℃. The model parameters
for LiFePO4 battery model are relatively simple.