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A novel practical state of charge estimation method: an adaptive improved ampere?hour method based on composite correction factor.

Xiong, Xin; Wang, Shun?Li; Fernandez, Carlos; Yu, Chun?Mei; Zou, Chuan?Yun; Jiang, Cong


Xin Xiong

Shun?Li Wang

Chun?Mei Yu

Chuan?Yun Zou

Cong Jiang


The research of the real-time state of charge (SOC) estimation method for lithium-ion battery is developing towards the trend of model diversification and algorithm complexity. However, due to the limitation of computing ability in the actual battery management system, the traditional ampere-hour (Ah) method is still widely used. First, temperature, charge-discharge current, and battery aging are considered as the main factors, which affect the estimation accuracy of the Ah method under the condition that detection accuracy of the current sensor is determined. Second, the relationship between the SOC and battery open-circuit voltage at different temperatures is analyzed, which is used to modify the initial SOC. Third, the influence mechanism of main factors on the effect of the Ah method is analyzed, and proposes a capacity composite correction factor to reflect the influence of charge-discharge efficiency, coulomb efficiency, and battery aging comprehensively, and then update its value in real-time. Lastly, the adaptive improved Ah formula and the complete SOC estimation model is designed, and the estimation effect of this model is verified by comparing with other SOC estimation methods in the experiment of dynamic cycle test. The results show that the estimation error of the adaptive improved method is less than 2% under two comprehensive working conditions, while the error of the traditional method is 5% to 10%, and compared with an extended kalman filter algorithm, it also gets a better SOC estimation performance, which proves that this method is scientific and effective.


XIONG, X., WANG, S.-L., FERNANDEZ, C., YU, C.-M., ZOU, C.-Y. and JIANG, C. 2020. A novel practical state of charge estimation method: an adaptive improved ampere-hour method based on composite correction factor. International journal of energy research [online], 44(4), pages 11385-11404. Available from:

Journal Article Type Article
Acceptance Date Jun 14, 2020
Online Publication Date Aug 20, 2020
Publication Date Nov 30, 2020
Deposit Date Aug 21, 2020
Publicly Available Date Aug 21, 2021
Journal International journal of energy research
Print ISSN 0363-907X
Electronic ISSN 1099-114X
Publisher Wiley Open Access
Peer Reviewed Peer Reviewed
Volume 44
Issue 14
Pages 11385-11404
Keywords Lithium-ion battery; State of charge; Adaptive improved ampere-hour method; Composite correction factor
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