An adaptive mixture prior in Bayesian convolutional autoencoder for early detecting anomalous degradation behaviors in lithium-ion batteries
Accurate and timely detection of anomalies in lithium-ion batteries is crucial for ensuring their reliability and safety. Complex degradation patterns and limited availability of labeled data pose significant challenges in identifying abnormal behaviors in battery usage. This paper proposes an unsup...
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| Veröffentlicht in: | Reliability engineering & system safety Jg. 259; S. 110926 |
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01.07.2025
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| ISSN: | 0951-8320 |
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| Abstract | Accurate and timely detection of anomalies in lithium-ion batteries is crucial for ensuring their reliability and safety. Complex degradation patterns and limited availability of labeled data pose significant challenges in identifying abnormal behaviors in battery usage. This paper proposes an unsupervised adaptive mixture distribution-based Bayesian convolutional autoencoder (AMDBCAE) method for detecting anomalous degradation behaviors in lithium-ion batteries at earlier cycles of reliability test. As the prior for the model parameters, we propose a mixture of the Laplace and Student’s t distributions by taking uncertainties in the weights of the convolutional network and their heavy-tailed characteristics into account. Using a modified form of the Bayes by backprop algorithm, the parameter of mixture proportion is adaptively updated to capture diverse and complex degradation patterns in battery degradation data more efficiently. Extracted latent features are then processed through unsupervised clustering algorithms to identify abnormal degradation behaviors of lithium-ion batteries. The analyses of two real-world lithium-ion battery datasets demonstrate the efficiency and accuracy of the proposed unsupervised framework with limited number of testing data. The proposed method addresses the limitations of manual feature extraction and the need for extensive experimental knowledge by leveraging the adaptive BCAE model to automatically extract latent features as a virtual health indicator in sparse data environments.
•Aim to detect anomalies of lithium-ion batteries at earlier stages of cycling test.•Address the limitations of manual feature extraction in a sparse data environment.•Propose an unsupervised adaptive Bayesian convolutional autoencoder (BCAE) method.•Propose a mixture of the Laplace and Student’s t distributions as the prior. |
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| AbstractList | Accurate and timely detection of anomalies in lithium-ion batteries is crucial for ensuring their reliability and safety. Complex degradation patterns and limited availability of labeled data pose significant challenges in identifying abnormal behaviors in battery usage. This paper proposes an unsupervised adaptive mixture distribution-based Bayesian convolutional autoencoder (AMDBCAE) method for detecting anomalous degradation behaviors in lithium-ion batteries at earlier cycles of reliability test. As the prior for the model parameters, we propose a mixture of the Laplace and Student’s t distributions by taking uncertainties in the weights of the convolutional network and their heavy-tailed characteristics into account. Using a modified form of the Bayes by backprop algorithm, the parameter of mixture proportion is adaptively updated to capture diverse and complex degradation patterns in battery degradation data more efficiently. Extracted latent features are then processed through unsupervised clustering algorithms to identify abnormal degradation behaviors of lithium-ion batteries. The analyses of two real-world lithium-ion battery datasets demonstrate the efficiency and accuracy of the proposed unsupervised framework with limited number of testing data. The proposed method addresses the limitations of manual feature extraction and the need for extensive experimental knowledge by leveraging the adaptive BCAE model to automatically extract latent features as a virtual health indicator in sparse data environments.
•Aim to detect anomalies of lithium-ion batteries at earlier stages of cycling test.•Address the limitations of manual feature extraction in a sparse data environment.•Propose an unsupervised adaptive Bayesian convolutional autoencoder (BCAE) method.•Propose a mixture of the Laplace and Student’s t distributions as the prior. |
| ArticleNumber | 110926 |
| Author | Chae, Sun Geu Bae, Suk Joo |
| Author_xml | – sequence: 1 givenname: Sun Geu orcidid: 0009-0003-1952-1957 surname: Chae fullname: Chae, Sun Geu email: sgchae@psm.hanyang.ac.kr – sequence: 2 givenname: Suk Joo orcidid: 0000-0002-9938-7406 surname: Bae fullname: Bae, Suk Joo email: sjbae@hanyang.ac.kr |
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| Keywords | Latent features Reliability test Deep autoencoder Unsupervised clustering Virtual health indicator |
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