State-of-Charge Determination in Lithium-Ion Battery Packs Based on Two-Point Measurements in Life

The state-of-charge (SOC) estimation is of extreme importance for the reliability and safety of battery operation. How to estimate SOC for an assembly of cells in a battery pack remains a subject of great interest. Here a viable method for SOC determination and tracking for multi-cell assemblies is proposed and validated. Using 3S1P (three in series and one in parallel) strings as an example, an inference of SOC is illustrated in a battery assembly based on a correct open pack voltage (OPV) versus SOC (i.e. OPV = ƒ(SOC)) function. The proposed method only requires the measurements of the rest cell voltages of the single cells at two distinct occasions. This accurate SOC estimation approach shall facilitate reliable battery control and management.

• Record URL:
  https://doi.org/10.1149/2.0201506jes
• Record URL:
  http://jes.ecsdl.org/content/162/6/A877.abstract
• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/00134651
• Supplemental Notes:
  • © 2015 Matthieu Dubarry et al.
• Authors:
  • Dubarry, Matthieu
  • Truchot, Cyril
  • Devie, Arnaud
  • Liaw, Bor Yann
• Publication Date: 2015

Language

• English

Media Info

• Media Type: Web
• Features: Figures; References; Tables;
• Pagination: A877-A884
• Serial:
  • Journal of The Electrochemical Society
  • Volume: 162
  • Issue Number: 6
  • Publisher: Electrochemical Society (ECS)
  • ISSN: 0013-4651
  • EISSN: 1945-7111
  • Serial URL: http://jes.ecsdl.org/

Subject/Index Terms

• TRT Terms: Electric vehicle charging; Electric vehicles; Ions; Lithium batteries; Vehicle range; Voltage
• Subject Areas: Highways; Vehicles and Equipment; I91: Vehicle Design and Safety;

Filing Info

• Accession Number: 01577613
• Record Type: Publication
• Files: TRIS
• Created Date: Sep 30 2015 9:08AM