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Title: On state-of-charge determination for lithium-ion batteries

Journal Article · · Journal of Power Sources
 [1]; ORCiD logo [1]; ORCiD logo [2];  [3]
  1. Tsinghua Univ., Beijing (China). State Key Lab. of Automotive Safety and Energy, Dept. of Automotive Engineering
  2. Idaho National Lab. (INL), Idaho Falls, ID (United States). Energy Storage and Advanced Vehicles
  3. Tsinghua Univ., Beijing (China). State Key Lab. of Automotive Safety and Energy, Dept. of Automotive Engineering; Beijing Inst. of Technology, Beijing (China). Beijing Co-innovation Center for Electric Vehicles

The estimation of state-of-charge (SOC) of a battery is a challenging topic in battery research. Although improved precisions have been reported at times, almost all are based on empirical approaches. Without sufficient fundamental understanding, the accuracy and precision of any SOC estimation remain questionable and to assess if a SOC estimation method were properly constructed remains difficult. Here, we review a range of topics including SOC definitions, methodologies of SOC estimation, calibration, regression (including modeling methods), and validation in terms of precision and accuracy. At the end, we intend to answer fundamental questions, such as: 1) can SOC estimation be self-adaptive without bias? 2) Why Ah-counting is a necessity in most battery-model-assisted regression methods? 3) How to determine the principle of multi-physical coupling in battery models? 4) To assess the accuracy in the SOC estimation, statistical methods should be employed to analyze factors that contribute to the uncertainty. By answering these questions, we shall reveal how fundamental principles work to aid the understanding of proper SOC estimation.

Research Organization:
Idaho National Laboratory (INL), Idaho Falls, ID (United States)
Sponsoring Organization:
USDOE Office of Nuclear Energy (NE)
Grant/Contract Number:
AC07-05ID14517
OSTI ID:
1470981
Alternate ID(s):
OSTI ID: 1416199; OSTI ID: 1484715
Report Number(s):
INL/JOU-17-40852-Rev001; INL/JOU-17-40852-Rev000
Journal Information:
Journal of Power Sources, Vol. 348, Issue C; ISSN 0378-7753
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 176 works
Citation information provided by
Web of Science

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Accurate and Efficient Estimation of Lithium-Ion Battery State of Charge with Alternate Adaptive Extended Kalman Filter and Ampere-Hour Counting Methods journal February 2019
Unscented Particle Filter for SOC Estimation Algorithm Based on a Dynamic Parameter Identification journal April 2019
State of Charge Estimation of a Lithium Ion Battery Based on Adaptive Kalman Filter Method for an Equivalent Circuit Model journal July 2019
An improved packing equivalent circuit modeling method with the cell‐to‐cell consistency state evaluation of the internal connected lithium‐ion batteries journal February 2019
A Comparative Study of Three Improved Algorithms Based on Particle Filter Algorithms in SOC Estimation of Lithium Ion Batteries journal August 2017
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Electrochemical noise of a Li-ion battery: measurement and spectral analysis journal February 2019
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