State of health estimation of LiFePO4 / graphite cells

Yancheng Zhang; Chao Yang Wang

doi:10.1149/05031.0275ecst

State of health estimation of LiFePO₄ / graphite cells

Yancheng Zhang, Chao Yang Wang

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

1 Scopus citations

Abstract

A new method is proposed to estimate state of health (SoH) of LiFePO ₄/graphite cells using partial charge capacity (PCC) between 3.5 and 3.6 V. A degradation index (DI), defined as the ratio of the current PCC to the initial PCC (for a fresh cell) at the same conditions, is found to linearly correlate with the SoH. The PCC is measured at constant current charging, which can readily be implemented and is much easier than using discharge diagnosis dependent on road and driving conditions. This method only needs to record charging time between 3.5 and 3.6 V during constant current charging, but does not require full discharge before the charging and any additional sensors or complex computations of model-based approaches. Consequently, it is an efficient and simple method to estimate the SoH of LiFePO₄/graphite cells by using the PCC-based degradation index.

Original language	English (US)
Title of host publication	Corrosion, Passivity, and Energy
Subtitle of host publication	A Symposium in Honor of Digby D. Macdonald
Publisher	Electrochemical Society Inc.
Pages	275-281
Number of pages	7
Edition	31
ISBN (Print)	9781607684190
DOIs	https://doi.org/10.1149/05031.0275ecst
State	Published - 2013
Event	Corrosion, Passivity, and Energy: A Symposium in Honor of Digby D. Macdonald - PRiME 2012 - Honolulu, HI, United States Duration: Oct 7 2012 → Oct 12 2012

Publication series

Name	ECS Transactions
Number	31
Volume	50
ISSN (Print)	1938-5862
ISSN (Electronic)	1938-6737

Other

Other	Corrosion, Passivity, and Energy: A Symposium in Honor of Digby D. Macdonald - PRiME 2012
Country/Territory	United States
City	Honolulu, HI
Period	10/7/12 → 10/12/12

All Science Journal Classification (ASJC) codes

Engineering(all)

Access to Document

10.1149/05031.0275ecst

Cite this

@inproceedings{f175288846504d499f316574ba579bac,

title = "State of health estimation of LiFePO4 / graphite cells",

abstract = "A new method is proposed to estimate state of health (SoH) of LiFePO 4/graphite cells using partial charge capacity (PCC) between 3.5 and 3.6 V. A degradation index (DI), defined as the ratio of the current PCC to the initial PCC (for a fresh cell) at the same conditions, is found to linearly correlate with the SoH. The PCC is measured at constant current charging, which can readily be implemented and is much easier than using discharge diagnosis dependent on road and driving conditions. This method only needs to record charging time between 3.5 and 3.6 V during constant current charging, but does not require full discharge before the charging and any additional sensors or complex computations of model-based approaches. Consequently, it is an efficient and simple method to estimate the SoH of LiFePO4/graphite cells by using the PCC-based degradation index.",

author = "Yancheng Zhang and Wang, {Chao Yang}",

year = "2013",

doi = "10.1149/05031.0275ecst",

language = "English (US)",

isbn = "9781607684190",

series = "ECS Transactions",

publisher = "Electrochemical Society Inc.",

number = "31",

pages = "275--281",

booktitle = "Corrosion, Passivity, and Energy",

edition = "31",

note = "Corrosion, Passivity, and Energy: A Symposium in Honor of Digby D. Macdonald - PRiME 2012 ; Conference date: 07-10-2012 Through 12-10-2012",

}

Zhang, Y & Wang, CY 2013, State of health estimation of LiFePO₄ / graphite cells. in Corrosion, Passivity, and Energy: A Symposium in Honor of Digby D. Macdonald. 31 edn, ECS Transactions, no. 31, vol. 50, Electrochemical Society Inc., pp. 275-281, Corrosion, Passivity, and Energy: A Symposium in Honor of Digby D. Macdonald - PRiME 2012, Honolulu, HI, United States, 10/7/12. https://doi.org/10.1149/05031.0275ecst

TY - GEN

T1 - State of health estimation of LiFePO4 / graphite cells

AU - Zhang, Yancheng

AU - Wang, Chao Yang

PY - 2013

Y1 - 2013

N2 - A new method is proposed to estimate state of health (SoH) of LiFePO 4/graphite cells using partial charge capacity (PCC) between 3.5 and 3.6 V. A degradation index (DI), defined as the ratio of the current PCC to the initial PCC (for a fresh cell) at the same conditions, is found to linearly correlate with the SoH. The PCC is measured at constant current charging, which can readily be implemented and is much easier than using discharge diagnosis dependent on road and driving conditions. This method only needs to record charging time between 3.5 and 3.6 V during constant current charging, but does not require full discharge before the charging and any additional sensors or complex computations of model-based approaches. Consequently, it is an efficient and simple method to estimate the SoH of LiFePO4/graphite cells by using the PCC-based degradation index.

AB - A new method is proposed to estimate state of health (SoH) of LiFePO 4/graphite cells using partial charge capacity (PCC) between 3.5 and 3.6 V. A degradation index (DI), defined as the ratio of the current PCC to the initial PCC (for a fresh cell) at the same conditions, is found to linearly correlate with the SoH. The PCC is measured at constant current charging, which can readily be implemented and is much easier than using discharge diagnosis dependent on road and driving conditions. This method only needs to record charging time between 3.5 and 3.6 V during constant current charging, but does not require full discharge before the charging and any additional sensors or complex computations of model-based approaches. Consequently, it is an efficient and simple method to estimate the SoH of LiFePO4/graphite cells by using the PCC-based degradation index.

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