Battery charging optimization for OCV-resistance equivalent circuit model

Author

Abdollahi, A. ; Raghunathan, N. ; Han, X. ; Avvari, G.V. ; Balasingam, B. ; Pattipati, K.R. ; Bar-Shalom, Y.

Author_Institution

Sch. of Electr. & Comput. Eng., Univ. of Connecticut, Storrs, CT, USA

fYear

2015

fDate

1-3 July 2015

Firstpage

3467

Lastpage

3472

Abstract

In this paper, we present a closed-form solution to the problem of optimally charging a Li-ion battery. The objective function is considered as a combination of two cost functions: time-to-charge (TTC) and energy losses (EL). For the case where cost function is a combination of TTC and EL, the optimal charging strategy is a Constant Current-Constant Voltage (CC-CV) policy with the value of the current in the CC stage being a function of the ratio of weighting on TTC and EL and of the resistance of the battery. The case where the cost function is a weighted sum of TTC, EL and a temperature rise index (TRI) is also considered and an analytical solution for the problem is derived. This analytical solution can be approximated by a CC-CV with the value of current in the CC stage being a function of ratio of weighting on TTC and EL, resistance of the battery and the effective thermal resistance. The effects of weights in the objective function on the optimal charging profile is discussed and the behavior of different kinds of commercial batteries are analyzed.

Keywords

equivalent circuits; secondary cells; thermal resistance; CC-CV; EL cost function; OCV-resistance equivalent circuit model; TRI; TTC cost function; battery charging optimization; battery resistance; charging profile; closed-form solution; constant current-constant voltage; energy loss; lithium-ion battery; open-circuit voltage; temperature rise index; thermal resistance; time-to-charge; Batteries; Cost function; Energy loss; Integrated circuit modeling; Mathematical model; Resistance; System-on-chip; battery charging; open circuit voltage; optimal charging; state of charge; time to charge;

fLanguage

English

Publisher

ieee

Conference_Titel

American Control Conference (ACC), 2015

Conference_Location

Chicago, IL

Print_ISBN

978-1-4799-8685-9

Type

conf

DOI

10.1109/ACC.2015.7171867

Filename

7171867