Energy Storage Science and Technology ›› 2023, Vol. 12 ›› Issue (2): 560-569.doi: 10.19799/j.cnki.2095-4239.2022.0611

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

Gaussian process regression based on indirect health indicators for SOH estimation of lithium battery

Ruijie WANG1,2(), Zhouli HUI1(), Ming YANG1,2()   

  1. 1.School of Mathematics, North University of China
    2.Shanxi Key Laboratory of Signal Capturing & Processing, North University of China, Taiyuan 030051, Shanxi, China
  • Received:2022-10-21 Revised:2022-11-07 Online:2023-02-05 Published:2022-11-25
  • Contact: Zhouli HUI, Ming YANG E-mail:2286944596@qq.com;13994208298@139.com;hgsnje@163.com

Abstract:

The performance of a lithium battery degrades gradually with increasing use time. If the replacement is not completed on time, serious accidents such as explosions may occur. Rapid and accurate prediction of battery state of health (SOH) is critical for lithium battery system management, maintenance, and safe use. In this paper, a machine learning model based on indirect His (health indicators) and GPR (Gaussian process regression) is proposed to predict the SOH of lithium batteries. First, the analysis of the lithium battery discharge process extracts some easily available and suitable for the direct external features of dynamic operations as indirect His, and their correlation with SOH, eventually selecting average discharge voltage, such as pressure drop discharge time, maximum discharge temperature, and platform stage discharge voltage initial plummet in value as the health index. Second, using the above mentioned His as input features, the GPR algorithm is used to establish a lithium battery degradation model, and the MAE (mean absolute error) is less than 2% for the prediction of NASA lithium battery datasets, while the RMSE is kept within 4%. Finally, the model is compared to other commonly used machine learning models, and then into multiple experimental conditions of battery model generalization performance analysis, control about 6% of the maximum error of the prediction. The experimental results show that the proposed indirect His and GPR have relatively higher prediction precision and good generalization ability.

Key words: health indicators, state of health, Gaussian process regression, support vector regression

CLC Number: