Abstract
To understand better the thermal behaviour of lithium-ion batteries under different working conditions, various experiments were applied to a 13 Ah Altairnano lithium titanate oxide battery cell by means of isothermal battery calorimeter. Several parameters were measured such as the battery surface temperature, voltage, current, power, heat flux, maximum temperature and power area. In addition, the efficiency was calculated. Isothermal battery calorimeter was selected as the most appropriate method for heat loss measurements. Temperatures on the surface of the battery were measured by employing four contact thermocouples (type K). In order to determine the heat loss of the battery, constant current charge and discharge pulses at sixteen different C-rates were applied to the battery. It was seen that the charge and discharge C-rates has a considerable influence on the thermal behaviours of lithium-ion batteries. In this research paper, the C-rate was linked to the peak temperature, efficiency and heat loss and it was concluded that they are linear dependent on the C-rate. In addition, the outcomes of this investigation can be used for battery thermal modelling and design of thermal management systems.
Highlights
Lithium-ion batteries are extensively employed in many applications including electric vehicles (EVs), hybrid electric vehicles (HEVs) and many consumer products such as cell phones, tablets and computers
The experiments were accomplished by employing isothermal battery calorimeter, which was manufactured by NETZSCH
A comprehensive investigation of the battery cell thermal behaviour by using isothermal calorimeter is illustrated in Tables 1 and 2
Summary
Lithium-ion batteries are extensively employed in many applications including electric vehicles (EVs), hybrid electric vehicles (HEVs) and many consumer products such as cell phones, tablets and computers. Various discharge rates and constant current charge, under abusive and normal operating conditions were applied to the battery For this studied case, the outcomes demonstrated that the fibre Bragg grating sensors have better resolution compared to the K type thermocouples. An efficient algorithm was demonstrated to approximate the current and voltage of a lithium-ion battery as a subordinate of time in constant-power charge and discharge conditions. Most of the previous studies did not take into account the effect of temperature, efficiency and current rate on the battery heat loss at fast charging and discharging conditions. In this work, the thermal behaviour and heat loss of a lithium-ion battery subjected to different fast charging and discharging protocols was investigated
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