An Active Balancing Method Based on SOC and Capacitance for Lithium-Ion Batteries in Electric Vehicles

An active balancing method based on the state of charge (SOC) and capacitance is presented in this article to solve the inconsistency problem of lithium-ion batteries in electric vehicles. The terminal voltage of each battery is collected first. Then, each battery SOC is accurately estimated by an e...

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Autores principales:	Renxiong Liu, Chaolong Zhang
Formato:	article
Lenguaje:	EN
Publicado:	Frontiers Media S.A. 2021
Materias:	lithium-ion batteries active balancing SOC EKF algorithm capacitance General Works A
Acceso en línea:	https://doaj.org/article/55ad60f4f75f4be9b54d1b0011855b25
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spelling	oai:doaj.org-article:55ad60f4f75f4be9b54d1b0011855b252021-11-04T07:38:11ZAn Active Balancing Method Based on SOC and Capacitance for Lithium-Ion Batteries in Electric Vehicles2296-598X10.3389/fenrg.2021.773838https://doaj.org/article/55ad60f4f75f4be9b54d1b0011855b252021-11-01T00:00:00Zhttps://www.frontiersin.org/articles/10.3389/fenrg.2021.773838/fullhttps://doaj.org/toc/2296-598XAn active balancing method based on the state of charge (SOC) and capacitance is presented in this article to solve the inconsistency problem of lithium-ion batteries in electric vehicles. The terminal voltage of each battery is collected first. Then, each battery SOC is accurately estimated by an extended Kalman filter (EKF) algorithm. In the experiment, the maximum absolute error of SOC evaluation is only 0.0061, and the mean absolute error is 0.0013 when the initial battery SOC is clear. Meanwhile, the maximum absolute error of SOC evaluation is 0.5 and the average absolute error of SOC is 0.0015 when the initial battery SOC is not clear. Afterward, an active balancing circuit based on the estimated battery SOC and capacitance is designed. The energy of capacitance is charged by the battery whose SOC is higher than the other batteries through the circuit to avoid the battery being overcharged. Then, the SOC of batteries gradually turn consistent. In the simulation experiment, the SOC difference of batteries is 7% before the balancing. Meanwhile, the SOC difference of batteries reduces to 0.02% after the balancing and the consuming time is merely 272s, which manifests that the proposed balancing method has a fast balancing speed and better balancing efficiency.Renxiong LiuChaolong ZhangFrontiers Media S.A.articlelithium-ion batteriesactive balancingSOCEKF algorithmcapacitanceGeneral WorksAENFrontiers in Energy Research, Vol 9 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	lithium-ion batteries active balancing SOC EKF algorithm capacitance General Works A
spellingShingle	lithium-ion batteries active balancing SOC EKF algorithm capacitance General Works A Renxiong Liu Chaolong Zhang An Active Balancing Method Based on SOC and Capacitance for Lithium-Ion Batteries in Electric Vehicles
description	An active balancing method based on the state of charge (SOC) and capacitance is presented in this article to solve the inconsistency problem of lithium-ion batteries in electric vehicles. The terminal voltage of each battery is collected first. Then, each battery SOC is accurately estimated by an extended Kalman filter (EKF) algorithm. In the experiment, the maximum absolute error of SOC evaluation is only 0.0061, and the mean absolute error is 0.0013 when the initial battery SOC is clear. Meanwhile, the maximum absolute error of SOC evaluation is 0.5 and the average absolute error of SOC is 0.0015 when the initial battery SOC is not clear. Afterward, an active balancing circuit based on the estimated battery SOC and capacitance is designed. The energy of capacitance is charged by the battery whose SOC is higher than the other batteries through the circuit to avoid the battery being overcharged. Then, the SOC of batteries gradually turn consistent. In the simulation experiment, the SOC difference of batteries is 7% before the balancing. Meanwhile, the SOC difference of batteries reduces to 0.02% after the balancing and the consuming time is merely 272s, which manifests that the proposed balancing method has a fast balancing speed and better balancing efficiency.
format	article
author	Renxiong Liu Chaolong Zhang
author_facet	Renxiong Liu Chaolong Zhang
author_sort	Renxiong Liu
title	An Active Balancing Method Based on SOC and Capacitance for Lithium-Ion Batteries in Electric Vehicles
title_short	An Active Balancing Method Based on SOC and Capacitance for Lithium-Ion Batteries in Electric Vehicles
title_full	An Active Balancing Method Based on SOC and Capacitance for Lithium-Ion Batteries in Electric Vehicles
title_fullStr	An Active Balancing Method Based on SOC and Capacitance for Lithium-Ion Batteries in Electric Vehicles
title_full_unstemmed	An Active Balancing Method Based on SOC and Capacitance for Lithium-Ion Batteries in Electric Vehicles
title_sort	active balancing method based on soc and capacitance for lithium-ion batteries in electric vehicles
publisher	Frontiers Media S.A.
publishDate	2021
url	https://doaj.org/article/55ad60f4f75f4be9b54d1b0011855b25
work_keys_str_mv	AT renxiongliu anactivebalancingmethodbasedonsocandcapacitanceforlithiumionbatteriesinelectricvehicles AT chaolongzhang anactivebalancingmethodbasedonsocandcapacitanceforlithiumionbatteriesinelectricvehicles AT renxiongliu activebalancingmethodbasedonsocandcapacitanceforlithiumionbatteriesinelectricvehicles AT chaolongzhang activebalancingmethodbasedonsocandcapacitanceforlithiumionbatteriesinelectricvehicles
_version_	1718445019600257024

An Active Balancing Method Based on SOC and Capacitance for Lithium-Ion Batteries in Electric Vehicles

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