Chinese Journal of Mechanical Engineering >

2022 , Vol. 35 >Issue 1: 4 - 4

DOI: https://doi.org/10.1186/s10033-021-00668-y

Advanced Transportation Equipment

Lifetime and Aging Degradation Prognostics for Lithium-ion Battery Packs Based on a Cell to Pack Method

  • Yunhong Che ,
  • Zhongwei Deng ,
  • Xiaolin Tang ,
  • Xianke Lin ,
  • Xianghong Nie ,
  • Xiaosong Hu
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  • 1. College of Mechanical and Vehicle Engineering, Chongqing University, Chongqing, 400044, China;
    2. State Key Laboratory of Mechanical Transmissions, Chongqing University, Chongqing, 400044, China;
    3. Department of Automotive, Mechanical and Manufacturing Engineering, Ontario Tech University, Oshawa, ON, L1G 0C5, Canada;
    4. Powertrain Engineering R & D Institute, Chongqing Changan Automotive Co. Ltd, Chongqing, 401133, China

Received date: 2021-07-19

  Revised date: 2021-10-13

  Online published: 2022-06-30

Supported by

Supported by National Natural Science Foundation of China (Grant Nos. 51875054, U1864212), Graduate Research and Innovation Foundation of Chongqing, China (Grant No. CYS20018), Chongqing Municipal Natural Science Foundation for Distinguished Young Scholars of China (Grant No. cstc2019jcyjjqX0016), Chongqing Science and Technology Bureau of China

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Abstract

Aging diagnosis of batteries is essential to ensure that the energy storage systems operate within a safe region. This paper proposes a novel cell to pack health and lifetime prognostics method based on the combination of transferred deep learning and Gaussian process regression. General health indicators are extracted from the partial discharge process. The sequential degradation model of the health indicator is developed based on a deep learning framework and is migrated for the battery pack degradation prediction. The future degraded capacities of both battery pack and each battery cell are probabilistically predicted to provide a comprehensive lifetime prognostic. Besides, only a few separate battery cells in the source domain and early data of battery packs in the target domain are needed for model construction. Experimental results show that the lifetime prediction errors are less than 25 cycles for the battery pack, even with only 50 cycles for model fine-tuning, which can save about 90% time for the aging experiment. Thus, it largely reduces the time and labor for battery pack investigation. The predicted capacity trends of the battery cells connected in the battery pack accurately reflect the actual degradation of each battery cell, which can reveal the weakest cell for maintenance in advance.

Key words： Lithium-ion battery packs; Lifetime prediction; Degradation prognostic; Model migration; Machine learning

Cite this article

Yunhong Che , Zhongwei Deng , Xiaolin Tang , Xianke Lin , Xianghong Nie , Xiaosong Hu . Lifetime and Aging Degradation Prognostics for Lithium-ion Battery Packs Based on a Cell to Pack Method[J]. Chinese Journal of Mechanical Engineering, 2022 , 35(1) : 4 -4 . DOI: 10.1186/s10033-021-00668-y

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