Publication detail

Passive Balancer for Eight Cell Battery LiFePo4 Pack

HERCEG, E. URBANEC, T.

Original Title

Passive Balancer for Eight Cell Battery LiFePo4 Pack

English Title

Passive Balancer for Eight Cell Battery LiFePo4 Pack

Type

conference paper

Language

en

Original Abstract

This Article deals with the passive balancer that is required in all multi-cell battery systems. The balancer is designed for eight LiFePo4 battery cells that are connected in series, to achieve the required voltage of about 28 V. Each cell has a capacity of about 9600 mAh, resulting in a 80 Ah battery back. The balance algorithm is performed by main STM32 microcontroller (MCU), which controls eight balancing transistors. For measuring battery cell voltages, there are two variants of cell measurement. The first alternative of cell measurement is a battery monitor IC, which is also capable of low side current measurement and as protection it also drives the low side current transistor switch, which protects powered device. Other options are measurement by 14-bit analog to digital converter (ADC) or with internal ADC of MCU. The balancer circuit also includes an RS485 interface for communication with other devices.

English abstract

This Article deals with the passive balancer that is required in all multi-cell battery systems. The balancer is designed for eight LiFePo4 battery cells that are connected in series, to achieve the required voltage of about 28 V. Each cell has a capacity of about 9600 mAh, resulting in a 80 Ah battery back. The balance algorithm is performed by main STM32 microcontroller (MCU), which controls eight balancing transistors. For measuring battery cell voltages, there are two variants of cell measurement. The first alternative of cell measurement is a battery monitor IC, which is also capable of low side current measurement and as protection it also drives the low side current transistor switch, which protects powered device. Other options are measurement by 14-bit analog to digital converter (ADC) or with internal ADC of MCU. The balancer circuit also includes an RS485 interface for communication with other devices.

Keywords

Balancer, Battery, Passive Balancer, Active Balancer, Voltage measurement, Current measurement

Released

25.04.2019

Publisher

Vysoké učení technické v Brně, Fakulta elektrotechniky a komunikačních technologií

Location

Brno

ISBN

978-80-214-5735-5

Book

Proceedings of the 25th Conference STUDENT EEICT 2019

Edition number

první

Pages from

489

Pages to

493

Pages count

5

BibTex


@inproceedings{BUT156891,
  author="Erik {Herceg}",
  title="Passive Balancer for Eight Cell Battery LiFePo4 Pack",
  annote="This Article deals with the passive balancer that is required in all multi-cell battery systems. The balancer is designed for eight LiFePo4 battery cells that are connected in series, to achieve
the required voltage of about 28 V. Each cell has a capacity of about 9600 mAh, resulting in a 80 Ah
battery back. The balance algorithm is performed by main STM32 microcontroller (MCU), which
controls eight balancing transistors. For measuring battery cell voltages, there are two variants of cell
measurement. The first alternative of cell measurement is a battery monitor IC, which is also capable
of low side current measurement and as protection it also drives the low side current transistor switch,
which protects powered device. Other options are measurement by 14-bit analog to digital converter
(ADC) or with internal ADC of MCU. The balancer circuit also includes an RS485 interface for
communication with other devices.",
  address="Vysoké učení technické v Brně, Fakulta elektrotechniky a komunikačních technologií",
  booktitle="Proceedings of the 25th Conference STUDENT EEICT 2019",
  chapter="156891",
  howpublished="online",
  institution="Vysoké učení technické v Brně, Fakulta elektrotechniky a komunikačních technologií",
  year="2019",
  month="april",
  pages="489--493",
  publisher="Vysoké učení technické v Brně, Fakulta elektrotechniky a komunikačních technologií",
  type="conference paper"
}