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Abstract
In this study, a battery management system was implemented using the passive charge balancing method. The battery system was created with lithium ion battery cells commonly used in electric vehicles. Two main microprocessors were used as a master and slave for the management system. An STM32f103C8 microcontroller was used as a master, and a PIC18f4520 microcontroller was used as slave control units in the battery management system. Charge control of a battery pack consisting of four cells was performed. The information received from the current and voltage sensors was collected from each cell using a slave controller and sent smoothly to the master controller system. These experimental results indicated that the passive balancing method was implemented and the battery cells were charged successfully. The proposed method was applied to battery pack consisting of a four-cell LiFePO4 battery with a capacity of 40 Ah. This work incorporated original situation that have not been realized before. A digital to analog converter circuit was created using a buck converter topology. Thus, the MOSFET was used as an adjustable resistance. Also, it was one of the first studies in which the MOSFET was used as a regulated resistor in battery management systems.
Highlights
Today, with the increasing pollution of the environment and increasing population density, in many areas, human beings are searching for systems that do not harm the environment
A lot of work has been done on the development of more environmentally friendly electric vehicles due to the harmful effects of internal combustion engines.[1,2,3]
By setting the PWM duty ratio according to the voltage difference between battery cells, the current value to be passed through the stone resistance was determined
Summary
With the increasing pollution of the environment and increasing population density, in many areas, human beings are searching for systems that do not harm the environment. By setting the PWM duty ratio according to the voltage difference between battery cells, the current value to be passed through the stone resistance was determined. With this process, excess voltage was used as heat on the stone resistance, and the cells were balanced. When the battery system needed a balancing operation, the current flow on the stone resistor was adjusted according to the voltage difference between. The master controller takes all the battery cell voltage, current, and temperature information completely with serial reading After this operation, these data are sent to the computer interface. Current, and temperature data are read for sending to the master controller
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