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A model‐based and data‐driven joint method for state‐of‐health estimation of lithium‐ion battery in electric vehicles
Author(s) -
Lyu Zhiqiang,
Gao Renjing
Publication year - 2019
Publication title -
international journal of energy research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.808
H-Index - 95
eISSN - 1099-114X
pISSN - 0363-907X
DOI - 10.1002/er.4784
Subject(s) - kalman filter , robustness (evolution) , estimator , state of health , extended kalman filter , thévenin's theorem , state space representation , state of charge , electric vehicle , control theory (sociology) , linearization , computer science , lithium ion battery , battery (electricity) , state vector , algorithm , engineering , mathematics , nonlinear system , artificial intelligence , statistics , power (physics) , chemistry , voltage , physics , equivalent circuit , biochemistry , control (management) , classical mechanics , quantum mechanics , electrical engineering , gene
Summary Lithium‐ion battery state‐of‐health estimation is one of the vital issues for electric vehicle safety. In this work, a joint model‐based and data‐driven estimator is developed to achieve accurate and reliable state‐of‐health estimation. In the estimator, an increase in ohmic resistance extracted from the Thevenin model is defined as the health indicator to quantify the capacity degradation. Then, a linear state‐space representation is constructed based on the data‐driven linear regression. Furthermore, the Kalman filter is introduced to trace capacity degradation based on the novel state space representation. A series of battery aging datasets with different dynamic loading profiles and temperatures are obtained to demonstrate the accuracy and robustness of the proposed method. Results show that the maximum error of the Kalman filter is 2.12% at different temperatures, which proves the effectiveness of the proposed method.