期刊
ENERGY REPORTS
卷 7, 期 -, 页码 7323-7332出版社
ELSEVIER
DOI: 10.1016/j.egyr.2021.10.095
关键词
Lithium-ion batteries; State of charge; Capacity estimation; Moving window; Recurrent neural network; Support vector machine
资金
- National Natural Science Foundation of China [51805041]
- Science and Technology Innovation Team of Shaan'xi Provincial, China [2020TD0012]
This paper proposes a co-estimation model for accurately estimating the SOC and capacity of aged lithium-ion batteries based on charging data. The results show that the proposed model outperforms other models, with a maximum RMSE of 0.85% and a computational cost below 5 s.
To accurately estimate the state of charge (SOC) of the aged batteries, the capacity estimation must not be ignored. Based on the battery charging data, this paper proposes a co-estimation model to estimate the SOC and capacity for lithium-ion batteries. First, a new health indicator of capacity is extracted based on the charging data of lithium batteries; second, the capacity is estimated by least squares support vector machine (LSSVM). The results are recorded based on a memory gate and used as the input of SOC estimation. Third, a moving window method is adopted to address the long-term dependency loss problem of the recurrent neural network (RNN), and a co-estimation model is obtained. Finally, the proposed model is compared with other models. The results show that the proposed model performs better. The maximum RMSE of the proposed model is 0.85%, and the computational cost of the proposed model is below 5 s. (C) 2021 The Authors. Published by Elsevier Ltd.
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