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Automotive Engineering ›› 2020, Vol. 42 ›› Issue (11): 1529-1536.doi: 10.19562/j.chinasae.qcgc.2020.11.011

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Fault Diagnosis of Traction Battery Pack Based on Improved Convolution Neural Network and Information Fusion

Peng Yunsai1, Xia Fei1, Yuan Bo2, Wang Zhicheng3, Luo Zhijiang4   

  1. 1. College of Automation Engineering, Shanghai University of Electric Power, Shanghai 200090;
    2. State Grid Narui Group Company, Nanjing 210000;
    3. State Grid Zhejiang Electric Transmission and Transformer Co., Ltd., Hangzhou 310020;
    4. State Grid Huaibei Electric Power Company, Huaibei 235000
  • Received:2020-01-03 Online:2020-11-25 Published:2021-01-25

Abstract: A fault diagnosis method for lithium-ion battery based on improved CNN and information fusion is proposed in this paper. Firstly, the Concat layer is added before the fully connected layer to fuse the features of different levels, so an improved CNN model is established. Then, the MCE criterion is used to optimize the cross entropy loss function, solving the problem that the non-label dimension gradient is not processed. In view of the insufficient practicality of the convolution kernel structure manually determined, the BIC criterion is used to determine the optimal structure of convolution kernel of the model. After diagnosis by using the improved CNN mentioned above, the conditions for confirmed diagnosis are introduced for judgment. For the diagnosis results not meeting the conditions, the general CNN network is further used for auxiliary diagnosis. By fusing preliminary diagnosis result and auxiliary diagnosis result using D-S evidence theory, the results of final diagnosis are obtained. The test results show that the method proposed can effectively enhance the accuracy of fault diagnosis on traction battery packs.

Key words: lithium-ion battery pack, fault diagnosis, convolutional neural network, BIC criterion, information fusion