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Forecasting battery capacity and power degradation with multi-task learning

Journal Article · · Energy Storage Materials
 [1];  [2];  [3];  [4];  [5]
  1. RWTH Aachen University (Germany); Jülich Aachen Research Alliance (JARA-Energy) (Germany); SLAC
  2. RWTH Aachen University (Germany)
  3. SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States); Stanford University, CA (United States)
  4. RWTH Aachen University (Germany); Jülich Aachen Research Alliance (JARA-Energy) (Germany)
  5. RWTH Aachen University (Germany); Jülich Aachen Research Alliance (JARA-Energy) (Germany); Helmholtz Institute Münster (HI MS), Jülich (Germany)

Lithium-ion batteries degrade due to usage and exposure to environmental conditions, which affects their capability to store energy and supply power. Accurately predicting the capacity and power fade of lithium-ion battery cells is challenging due to intrinsic manufacturing variances and coupled nonlinear ageing mechanisms. In this paper, we propose a data-driven prognostics framework to predict both capacity and power fade simultaneously with multi-task learning. The model is able to predict the degradation trajectory of both capacity and internal resistance together with knee-points and end-of-life points accurately at early-life stage. The validation shows an average percentage error of 2.37% and 1.24% for the prediction of capacity fade and resistance rise, respectively. The model's ability to accurately predict the degradation, facing capacity and resistance estimation errors, further demonstrates the model's robustness and generalizability. Compared with single-task learning models for forecasting capacity and power degradation, the model shows a significant prediction accuracy improvement and computational cost reduction. This work presents the highlights of multi-task learning in the degradation prognostics for lithium-ion batteries.

Research Organization:
SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC)
Grant/Contract Number:
AC02-76SF00515
OSTI ID:
2006551
Journal Information:
Energy Storage Materials, Journal Name: Energy Storage Materials Vol. 53; ISSN 2405-8297
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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