Energy Storage Science and Technology ›› 2020, Vol. 9 ›› Issue (5): 1566-1573.doi: 10.19799/j.cnki.2095-4239.2020.0022

• Energy Storage Test: Methods and Evaluation • Previous Articles     Next Articles

Life prediction of lithium battery based on EEMD-GSGRU

Lingzhi YI1,3(), Zongguang ZHANG1,2(), Chaodong FAN1,2, Xianguang LUO4, Wang LI4, Wenhan LIU1,2   

  1. 1.Key Laboratory of Intelligent Computing & Information Processing (Xiangtan University), Xiangtan 411105, Hunan, China
    2.Hunan Province Engineering Research Center for Multi-Energy Collaborative Control Technology, Xiangtan 411105, Hunan, China
    3.Hunan Province Cooperative Innovation Center for Wind Power Equipment and Energy Conversion, Xiangtan 411105, Hunan, China
    4.The State Key Laboratory of Heavy Duty AC Drive Electric Locomotive Systems Integration, Zhuzhou 412001, Hunan, China
  • Received:2020-01-08 Revised:2020-05-25 Online:2020-09-05 Published:2020-09-08
  • Contact: Lingzhi YI E-mail:ylzwyh@xtu.edu.cn;1574511421@qq.com

Abstract:

Mathematical models for predicting lithium battery lives are complex, prone to over-fitting, and have poor generalization; accordingly, a time series decomposition-integration model (EEMD-GSGRU) based on Ensemble Empirical Mode Decomposition (EEMD) and Gated Recurrent Unit (GRU) with Grid Search (GS) is proposed. In this model, the lithium battery capacity data are first decomposed into the trend factor with a large total proportion and the error factor with a small total proportion. Then, the decomposed time series are predicted for GRU and combined for a real-time rolling prediction. Finally, GS is used to search the network parameters and Adam optimization is used to update the network weight of the GRU. Using a lithium battery dataset provided by NASA for the model, the superiority of the EEMD-GSGRU model is proved in comparison to other algorithms. It is shown that the EEMD-GSGRU model improves the accuracy of the lithium battery life prediction.

Key words: lithium battery, life prediction, signal decomposition, gated recurrent unit, prediction accuracy

CLC Number: