Development of Standalone Control Unit for Automotive Battery Management System
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Författare
Typ
Examensarbete för masterexamen
Program
Modellbyggare
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Sammanfattning
Conventional vehicles have made a great impact on climatic changes which in turn
has made way for the electric vehicles in the market as they have zero emissions.
Electric vehicles run on large number of batteries. Batteries are very sensitive to
temperature variations and incorrect charging. The performance of the battery
pack is dependent on various battery operating parameters that involve battery
temperature, depth of discharge, charge and discharge rates. Monitoring the battery
operating parameters is essential for safe and reliable operation of the cells,
energy management system and maintenance of the battery.
This thesis is about firmware development for battery monitoring, battery parameters
measurement and battery state estimation using a Battery monitoring IC which
is part of battery management system(BMS) in hybrid electric vehicles(HEV), plugin
hybrid electric vehicles (PHEV) and battery electric vehicles(BEV). The customized
hardware has a small ARM processor integrated into an FPGA which will
establish connection with the Battery Monitoring IC and does the required configurations.
Certain battery operating parameters are measured and monitored periodically
by the Battery Monitoring IC and shunt based measurement system. Based
on the calculated state of charge (SoC) further safety decisions are taken. This system
is used in an integrated system, thus reduces data processing load for the main
controller and also reduces the data traffic. As the system is modular, it is reusable
in many other projects. The results of this thesis show that the firmware is capable
of doing the battery monitoring, measure the battery operating parameters and
perform battery state estimation. The tests implemented on the test bench were to
verify the implementation, and to evaluate the battery state estimation algorithm.
Beskrivning
Ämne/nyckelord
Battery management system, battery monitoring IC, measurement, battery operating parameters, SoC, safety, battery state estimation