Fast Estimation of Open Circuit Voltage for Lithium-ion Batteries

doi:10.3901/JME.2022.08.227

Abstract

Abstract: An off-line quick battery open circuit voltage estimation method which can be used to estimate the open circuit voltage that need to be stored for a long time to be stable in a short time was proposed. A voltage relaxation model with weights is established and the loss function is constructed by using the voltage data and the model estimated value to be put in a short period of time. Optimizing the parameters in the loss function by using optimization algorithm. The battery open circuit voltage estimation process including discharging, shelving, and estimating the open circuit voltage. The whole process about 30-40 min, that is, the estimation of the open circuit voltage that can be stable after several hours of standing can be completed in 30-40 min. In order to test the feasibility of this model, an experiment was designed for the open-circuit voltage estimation of LiNixCoyMn1-x-y battery under different state of charge(SOC), different temperature and different discharge rate, then an experiment was designed for the cyclic attenuation of battery capacity, and the open-circuit voltage of the battery was further estimated after the battery aging. The results show that the model can well estimate the open circuit voltage of the battery under different SOC and different temperature. The fast estimation method of battery open-circuit voltage proposed can predict the stable open-circuit voltage rapidly and accurately, which is of great significance in SOC, state of health(SOH) and battery capacity estimation and can greatly shorten the time of estimation.

Key words: open circuit voltage, fast estimation, voltage relaxation, capacity estimation

CLC Number:

TM912

LIU Haidong, ZHOU Ping, ZHOU Zheng, ZHENG Yuejiu. Fast Estimation of Open Circuit Voltage for Lithium-ion Batteries[J]. Journal of Mechanical Engineering, 2022, 58(8): 227-235,243.

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