Li-ion thermal issues and modelling in nominal and extreme operating conditions for HEV / PHEVs
The technical and commercial success of hybridelectric
vehicles (HEV) and plug-in hybrid-electric vehicles
(PHEV) is strongly related to the security, cost and lifetime of the
traction battery. Temperature is one of the most significant
factors impacting the security, performance and life of an
electrochemical battery. Regardless the cooling system adopted,
the essential issue is to control the temperature gradient within
each element in addition to the temperature profile across the
entire energy storage system. An underestimation of internal
temperatures would lead to non-uniform material ageing, but
would also increase the risk of thermal runaway for some
Lithium-based battery technologies. In this work, an original 0D
impedance-based hybrid thermal/electrical model is developed,
validated against experimental data and coupled with radial and
axi-symmetric 2D model taking into account geometrical
properties of a commercial cylindrical LiFePO4/Carbone 2,3 Ah
cell.