An anti-racing PWM-based battery pack equalization

Lan-Rong Dung*, Chieh Tsen Lin, Hsiang Fu Yuan

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contribution

2 Scopus citations

Abstract

Following the trend of eco-conscious, the automakers tend to use high-voltage packs in the electric vehicle or hybrid electric vehicle. The packs are formed by battery cells in series and parallel connections. Because of the variation of battery production, their capacity, impedance, lifetime and chemistry characteristic vary with ambient temperature. When the batteries are charged or discharged as a pack, the differences result in the imbalance of the battery voltage. The imbalance turns out over-charged and over-discharged and shortens the capacity and lifetime of batteries. Among the equalization methods, resistively switching approach is widely used for its low complexity and low cost. The controller gauges the battery voltage no matter the equalization is on or off. The comparison of two battery voltages must be based on the charging current. If not, the racing phenomenon happens and the equalization circuit would be turned on and off frequently. PWM-based equalization can solve this problem. Detecting the voltages of the batteries when the duty is off ensures the battery voltages are both based on the charging current. The PWM-based equalization successfully eliminates the racing phenomenon and shortens charging time by 48%; from 6200 seconds of switching shunt resistor equalization to 3200 seconds.

Original languageEnglish
Title of host publicationInternational Conference on Control, Automation and Systems
PublisherIEEE Computer Society
Pages1244-1248
Number of pages5
ISBN (Electronic)9788993215069
DOIs
StatePublished - 16 Dec 2014
Event2014 14th International Conference on Control, Automation and Systems, ICCAS 2014 - Gyeonggi-do, Korea, Republic of
Duration: 22 Oct 201425 Oct 2014

Publication series

NameInternational Conference on Control, Automation and Systems
ISSN (Print)1598-7833

Conference

Conference2014 14th International Conference on Control, Automation and Systems, ICCAS 2014
CountryKorea, Republic of
CityGyeonggi-do
Period22/10/1425/10/14

Keywords

  • Battery Equalization
  • Battery Management System
  • PWM

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  • Cite this

    Dung, L-R., Lin, C. T., & Yuan, H. F. (2014). An anti-racing PWM-based battery pack equalization. In International Conference on Control, Automation and Systems (pp. 1244-1248). [6987747] (International Conference on Control, Automation and Systems). IEEE Computer Society. https://doi.org/10.1109/ICCAS.2014.6987747