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Inconsistency modeling of lithium-ion battery pack based on variational auto-encoder considering multi-parameter correlation

Author

Listed:
  • He, Xitian
  • Sun, Bingxiang
  • Zhang, Weige
  • Su, Xiaojia
  • Ma, Shichang
  • Li, Hao
  • Ruan, Haijun

Abstract

—The accurate battery pack model is of great significance for the strategy development and functional verification of battery management system with the advantages of the high repeatability, fast state switching, and high safety. In this paper, a total of 49 dimensions of battery pack parameters are obtained through systematic experiments, including equivalent circuit model parameters and thermal characteristic parameters. Since the variational auto-encoder (VAE) can well preserve the correlation between parameters by training the neural network with small samples (95 samples), a novel battery pack inconsistency method is proposed based on VAE. Moreover, the parameter correlation and similarity are further considered based on the original loss function, which enables parameters generation for any amount of samples. The simulation results of the 95 and 500 generated samples illustrated that the proposed method can well maintain the similarity with the original parameters in both parameters distribution and parameters correlation, compared with the Copula-based and Metropolis-Hastings-based method. The average temperature error of the VAE-based method (0.02%) is much smaller than that of the Copula-based method (0.80%), and the temperature standard deviation error of the VAE-based method can be reduced to 4.53%, while the Copula-based method can reach 105.38%.

Suggested Citation

  • He, Xitian & Sun, Bingxiang & Zhang, Weige & Su, Xiaojia & Ma, Shichang & Li, Hao & Ruan, Haijun, 2023. "Inconsistency modeling of lithium-ion battery pack based on variational auto-encoder considering multi-parameter correlation," Energy, Elsevier, vol. 277(C).
    • Handle: RePEc:eee:energy:v:277:y:2023:i:c:s0360544223008034
    DOI: 10.1016/j.energy.2023.127409
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    References listed on IDEAS

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