An Aging-Compatible Inductor-Based Equalization Mechanism for LFP Batteries

Lan-Rong Dung, Zhe Yuan Song, Hsiang Fu Yuan

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

This paper proposes an aging-compatible inductor- based equalization mechanism for LFP batteries. Due to the characteristic of flat voltage curve, voltage equalization does not always successfully balance a series-connected battery pack. The proposed inductor-based equalization mechanism is developed to smartly balance battery voltage in the right state-of-charge (SOC) region regardless of the extent of battery aging deterioration. The mechanism includes two parts: one is balancing trigger voltage search, and the other one is the balancing current control. Experimental results show that the proposed equalization mechanism can increase the 8.4% storage capacity of the fresh cell and the 3.6% storage capacity of the aging cell. The conventional equalization can increase the 8.3% storage capacity of the fresh cell but decrease the 2.7% storage capacity of the aging cell. The experimental results also prove that equalization at different stages are not always beneficial. Using the aging-compatible inductor- based equalization mechanism can obtain a better balancing performance.

Original languageEnglish
Title of host publication2015 IEEE Vehicle Power and Propulsion Conference, VPPC 2015 - Proceedings
PublisherInstitute of Electrical and Electronics Engineers Inc.
ISBN (Electronic)9781467376372
DOIs
StatePublished - 10 Dec 2015
Event12th IEEE Vehicle Power and Propulsion Conference, VPPC 2015 - Montreal, Canada
Duration: 19 Oct 201522 Oct 2015

Publication series

Name2015 IEEE Vehicle Power and Propulsion Conference, VPPC 2015 - Proceedings

Conference

Conference12th IEEE Vehicle Power and Propulsion Conference, VPPC 2015
CountryCanada
CityMontreal
Period19/10/1522/10/15

Keywords

  • Balance
  • balancing control mechanism
  • inductor-based equalization
  • lithium iron phosphate battery

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