Influence of the Discretization Methods for the Model of Lithium-Ion Battery

An accurate battery model is significant for the management and safety of lithium-ion battery. Many methods have been proposed for battery modeling, and the equivalent circuit models are the most widely applied in practice. The construction of the equivalent circuit models require to be discrete, an...

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Bibliographic Details
Published in:2025 4th Conference on Fully Actuated System Theory and Applications (FASTA) pp. 1439 - 1443
Main Authors: Zhang, Zepei, Fan, Yuan, Kuang, Huyong
Format: Conference Proceeding
Language:English
Published: IEEE 04.07.2025
Subjects:
Accuracy
back propagation neural network
Backpropagation
battery model
Computational modeling
Equivalent circuits
Integrated circuit modeling
Lithium-ion batteries
Lithium-ion battery
Neural networks
Parameter estimation
parameter identification
Resistance
Safety
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Summary:An accurate battery model is significant for the management and safety of lithium-ion battery. Many methods have been proposed for battery modeling, and the equivalent circuit models are the most widely applied in practice. The construction of the equivalent circuit models require to be discrete, and few researches have focused the influence of discretization methods. In this work, a novel parameter identification method is proposed, which is based on the back propagation neural network (BPNN) and gradient descent method. The model parameters is employed to define the weights of the BPNN, and the gradient descent algorithm is adopted to optimize them. Compared with extended kalman filter (EKF)- based method, the proposed method can improve the model accuracy by 0.27%. Based on the BP-based method, different discretization methods are compared to explore their influence, including the backward difference method and zero-order holding method. The result shows that zero-order holding method is more reliable than the backward difference method according to the identified internal resistance.
DOI:10.1109/FASTA65681.2025.11138124