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SOC Estimation of Lithium Battery Based on Adaptive Square Root Rank Filter Algorithm
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Chuanming ZHANG1, 2, Youhong WAN1, 2, Yang XIAO1, 2, Zilong CHEN1, 2
Journal of Power Supply | 2026, 24(3) : 153 - 160
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Journal of Power Supply | 2026, 24(3): 153-160
• Renewable Energy Generation and Energy Storage •
SOC Estimation of Lithium Battery Based on Adaptive Square Root Rank Filter Algorithm
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Chuanming ZHANG1, 2, Youhong WAN1, 2, Yang XIAO1, 2, Zilong CHEN1, 2
Affiliations
  • 1.College of Automation, Nanjing University of Posts and Telecommunications, Nanjing 210023, China
  • 2.College of Artificial Intelligence, Nanjing University of Posts and Telecommunications, Nanjing 210023, China
Published: 2026-03-30 doi: 10.13234/j.issn.2095-2805.2026.3.153
Outline
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The estimation performance of state-of-charge (SOC) of lithium battery plays a vital role in abattery management system. The recursive least squares method with forgetting factor was used to identify the parameters of a battery model. Aimed at the problem that the sampling of a filter in the existing SOC estimation algorithm cannot well simulate the probability distribution of the system state, a rank sampling method was introduced, and an adaptive square root rank filter algorithm was proposed. The covariance matrix of the system state was updated iteratively in the form of square root, and the observation noise was adjusted adaptively according to the innovation in each iteration, so as to improve the SOC estimation accuracy and its adaptive capability with respect to noise. The performance of the proposed algorithm was verified by simulation experiments under FUDS and DST conditions. Results show that the proposed algorithm can improve the convergence speed and estimation accuracy compared with extended Kalman filter, unscented Kalman filter and rank filter.

Lithium battery  /  state-of-charge (SOC)  /  recursive least squares method  /  adaptive  /  square root  /  rank filter
张传明, 万佑红, 肖杨, 陈子龙. 基于自适应平方根秩滤波算法的锂电池SOC估计. 电源学报, 2026 , 24 (3) : 153 -160 . DOI: 10.13234/j.issn.2095-2805.2026.3.153
Chuanming ZHANG, Youhong WAN, Yang XIAO, Zilong CHEN. SOC Estimation of Lithium Battery Based on Adaptive Square Root Rank Filter Algorithm[J]. Journal of Power Supply, 2026 , 24 (3) : 153 -160 . DOI: 10.13234/j.issn.2095-2805.2026.3.153
Funding
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  • National Natural Science Foundation of China(62073172)
Appendix
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Year 2026 volume 24 Issue 3
35
5
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Article Info
doi: 10.13234/j.issn.2095-2805.2026.3.153
  • Receive Date：2023-03-09
  • Online Date：2026-10-29
  • Published：2026-03-30
Article Data
Affiliations
History
  • Received：2023-03-09
  • Revised：2023-07-17
  • Accepted：2023-12-02
Funding
National Natural Science Foundation of China(62073172)
Affiliations
    1.College of Automation, Nanjing University of Posts and Telecommunications, Nanjing 210023, China
    2.College of Artificial Intelligence, Nanjing University of Posts and Telecommunications, Nanjing 210023, China
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