State of Charge Imbalance Estimation for Battery Strings Under Reduced Voltage Sensing

Autor:	Yonghua Li, R. Dyche Anderson, Anna G. Stefanopoulou, Xinfan Lin
Rok vydání:	2015
Předmět:	Engineering business.industry Observable Battery pack State of charge Hardware_GENERAL Control and Systems Engineering Control theory Robustness (computer science) Voltage sensing System on a chip Observability Electrical and Electronic Engineering business Voltage
Zdroj:	IEEE Transactions on Control Systems Technology. 23:1052-1062
ISSN:	1558-0865 1063-6536
DOI:	10.1109/tcst.2014.2360919
Popis:	Reducing voltage sensing in a battery pack is beneficial for cutting the cost of the battery management system. In this paper, a methodology is designed to estimate the states of charge (SOC) of two cells connected in series when only their total voltage is measured. First, the feasibility is analyzed based on the nonlinear observability of the two-cell string under reduced voltage sensing. Furthermore, observability analysis is performed to different battery chemistries to determine their respective observable SOC ranges based on the voltage-SOC relationship. A trajectory-based nonlinear observer, the Newton observer, is then designed for SOC estimation and has been validated by experiments. The limitation of extending the method to strings with more than two cells is also discussed. The methodology is initially designed under the assumption of equal and known capacity and resistance among cells. The robustness of estimation is finally investigated when the above assumptions do not hold.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::6981e432475b35dbbc594c199fefe121 https://doi.org/10.1109/tcst.2014.2360919 Zobrazit plný text záznamu