Abstract
In this paper, the study and modelling of a lithium-ion battery cell is presented. To test the considered cell, a battery testing system was built using two programmable power units: an electronic load and a power supply. To communicate with them, a software/hardware interface was implemented within the National Instruments (NI) LabVIEW environment. This dedicated laboratory equipment can be used to apply charging/discharging cycles according to user defined load profiles. The battery modelling and the parameters identification procedure are described. The model was used to estimate the State Of Charge (SOC) under dynamic loading conditions. The most spread techniques used in the field of battery modelling and SOC estimation are implemented and compared.
Highlights
Nowadays, due to the environmental issue, the interest on Electric Vehicles (EVs) and on Hybrid Electric Vehicles (HEVs) is growing again thanks to their lower pollutant emissions and higher efficiency
The possibility to build a platform that can act as an interface between the software and the hardware has been underlined
It is able to handle at the same time the charging stage and the discharging stage, imposing proper commands to the devices’ analogue interfaces
Summary
Due to the environmental issue, the interest on Electric Vehicles (EVs) and on Hybrid Electric Vehicles (HEVs) is growing again thanks to their lower pollutant emissions and higher efficiency. The automotive field [1], and, more recently, the working machinery field too [2], are continuously involved in new studies and technological proposals. In the latter, lots of attention must be put on the architecture design depending on the power requirements of the specific application [3]. The main difference between an Internal Combustion Engine Vehicle (ICEV) and an EV or HEV is the presence of a battery pack used to power the vehicle. The battery pack is a system of single cells connected in series to increase the voltage and in parallel to increase the capacity. Battery cells performance and safety mainly depend on the voltage, current and temperature range in which they work, so an electronic unit called Battery Management System (BMS) is devoted to handle them [4]
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