FANG Sidun,LIU Longzhen,KONG Laiqiang,et al.State-of-health Estimation for Lithium-ion Batteries Incorporating Indirect Health Indicators Based on Bi-directional Long Short-term Memory Networks[J].Automation of Electric Power Systems,2024,48(4):160-168.
FANG Sidun,LIU Longzhen,KONG Laiqiang,et al.State-of-health Estimation for Lithium-ion Batteries Incorporating Indirect Health Indicators Based on Bi-directional Long Short-term Memory Networks[J].Automation of Electric Power Systems,2024,48(4):160-168. DOI: 10.7500/AEPS20230627011.
State-of-health Estimation for Lithium-ion Batteries Incorporating Indirect Health Indicators Based on Bi-directional Long Short-term Memory Networks
Rapid and accurate estimation of the state of health (SOH) of lithium-ion batteries throughout their entire life cycle can help improve the safety and reliability of energy storage equipment. An SOH estimation model is proposed
which combines indirect health indicators (IHIs) with bi-directional long short-term memory (BiLSTM) network optimized by the whale optimization algorithm (WOA). The model takes into account the influence of future states on the current SOH. First
the constant current-constant voltage charging and discharging process of lithium-ion battery is analyzed
multiple time characteristics of voltage
current
and temperature that dynamically change with charging and discharging cycles are extracted as IHIs
and the indicator of discharging load voltage drop time is added. Then
through correlation analysis
selected IHIs with high correlation to capacity are set as input features. Finally
a BiLSTM network optimized by WOA is established as the battery SOH estimation model
and the NASA lithium-ion battery dataset is used to estimate the battery SOH under two different operating conditions. The results indicate that the proposed method can effectively improve the estimation accuracy of SOH.
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references
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Related Institution
State Grid Zhejiang Electric Power Co., Ltd.
Electric Power Research Institute of State Grid Zhejiang Electric Power Co., Ltd.
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Key Laboratory of Modern Power System Simulation and Control & Renewable Energy Technology, Ministry of Education (Northeast Electric Power University)
State Key Laboratory of Advanced Electromagnetic Engineering and Technology (Huazhong University of Science and Technology)