A Novel State-of-Charge Estimation Algorithm of EV Battery Based on Bilinear Interpolation

Author

Wang Liye ; Wang Lifang ; Li Yong

Author_Institution

Key Lab. of Power Electron. & Electr. Drive, Inst. of Electr. Eng., Beijing, China

fYear

2013

fDate

15-18 Oct. 2013

Firstpage

1

Lastpage

4

Abstract

Accurate SOC estimation is the key function of a electric vehicle battery management system. The characteristics of EV battery in constant charge and discharge working conditions is investigated. And the the relationships between the battery SOC, terminal voltage and input/output current are established in the form of 3D lookup table. Then the basic principles of bilinear interpolation method are introduced. Finally, on the basis of the 3D lookup table, the bilinear interpolation method based battery SOC estimation algorithm is proposed. Computer simulation and real electric vehicle test tesults show that SOC estimation algorithm can obtain high estimation accuracy, and has high practical value in real-world electric vehicle working conditions.

Keywords

battery management systems; battery powered vehicles; interpolation; table lookup; 3D lookup table; EV battery; SOC estimation algorithm; bilinear interpolation method; computer simulation; constant charge working conditions; constant discharge working conditions; electric vehicle battery management system; input-output current; real-world electric vehicle working conditions; state-of-charge estimation algorithm; terminal voltage;

fLanguage

English

Publisher

ieee

Conference_Titel

Vehicle Power and Propulsion Conference (VPPC), 2013 IEEE

Conference_Location

Beijing

Type

conf

DOI

10.1109/VPPC.2013.6671658

Filename

6671658