Machine learning-based fast charging of lithium-ion battery by perceiving and regulating internal microscopic states
Artikel i vetenskaplig tidskrift, 2023

Fast charging of the lithium-ion battery (LIB) is an enabling technology for the popularity of electric vehicles. However, high-rate charging regardless of the physical limits can induce irreversible degradation or even hazardous safety issues to the LIB system. Motivated by this, this paper proposes a machine learning-based fast charging strategy with multi-physical awareness within a battery-to-cloud framework. In particular, a reduced-order electrochemical-thermal model is built in the cloud to perceive the microscopic states of LIB, leveraging which the soft actor-critic (SAC) deep reinforcement learning (DRL) algorithm is exploited for the first time to train a fast charging strategy. Hardware-in-Loop tests and experiments with practical LIBs are carried out for validation. Results suggest that the battery-to-cloud architecture can mitigate the risk of a heavy computing burden in the real-time controller. The proposed strategy can effectively mitigate the unfavorable over-temperature and lithium deposition, which benefits the safety and longevity during fast charging. Given a similar charging speed, the proposed machine learning approach extends the LIB cycle life by about 75% compared to the commonly-used empirical protocol. Meanwhile, the proposed strategy is proven superior to the state-of-the-art rule-based and the model-based strategies in terms of charging rapidity, charging safety and computational complexity. Moreover, the trained low-complexity strategy is highly adaptive to the ambient temperature and initial charging state, which promises robust performance in practical applications.

deep reinforcement learning

machine learning

fast charging

battery

Författare

Zhongbao Wei

Beijing Institute of Technology

Xiaofeng Yang

Beijing Institute of Technology

Yang Li

Chalmers, Elektroteknik, System- och reglerteknik

Hongwen He

Beijing Institute of Technology

Weihan Li

RWTH Aachen University

Dirk Uwe Sauer

RWTH Aachen University

Energy Storage Materials

2405-8297 (eISSN)

Vol. 56 62-75

Ämneskategorier

Datorteknik

Annan teknik

Elektroteknik och elektronik

Drivkrafter

Hållbar utveckling

Styrkeområden

Transport

Energi

DOI

10.1016/j.ensm.2022.12.034

Mer information

Senast uppdaterat

2023-01-25