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| Modeling Method of Lithium-Ion Battery Considering Commonly Used Constant Current Conditions |
| Liu Wei1, Yang Geng2, Meng Deyue1, Li Lianbing3, Wang Bingzhang1 |
1. College of Mechanical and Electrical Engineering Cangzhou Normal University Cangzhou 061001 China;
2. Department of Automation Tsinghua University Beijing 100084 China;
3. School of Artificial Intelligence Hebei University of Technology Tianjin 300130 China |
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Abstract The open circuit voltage Uoc and internal resistance R of Lithium-ion battery (LiB) are important parameters for the feature evaluation of LiB. Because Uoc and R are in non-linear and coupling relationships with the state of charge (SOC), current I and temperature T of a LiB, it is difficult to formulate an accurate mathematical model of the parameters (Uoc, R) relative to the variables for engineering applications. This paper proposes an engineering modeling method to establish a mapping relationship between the parameters (Uoc, R) and the variables (SOC, I, T) of LiB in the concerned application range. This method firstly designed multiple constant-current experiments within the range of LiB common operating conditions, and obtained experimental data containing typical information of variables (SOC, I, T). Secondly, a designed data process was used to solve the SOC simultaneous change problem with the temperature T during operation and calculate (Uoc, R) under the typical operating points {SOC, I, T}. Finally, the method gave the mapping of SOC, I, T to (Uoc, R), and then established the Uoc model and R model, respectively.compared with existed models, this model involves comprehensive working conditions, short experiment time and better parameter estimation accuracy, which is suitable for LiB engineering applications and characteristics research. The experimental results verify the effectiveness of the method.
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Received: 11 March 2021
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2021, Vol. 36 
