基于恒流实验的锂离子电池开路电压与内阻估计方法

doi:10.19595/j.cnki.1000-6753.tces.171197

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Abstract Open circuit voltage (OCV) and internal resistance (R) are key parameters in equivalent circuit model of lithium-ion batteries and are used to analyze the power capability, uniformity and aging status of the batteries. OCV and R are nonlinear functions of state of charge (SOC), current (I) and battery temperature (T_bat) and it is hard to give detailed, fast and accurate OCV and R estimation results at the same time. This paper proposes an OCV and R estimation method based on tests and corresponding data dealing process. The method designs constant current tests under different ambient temperatures to give detailed data and uses big test current to shorten test time. Based on battery electrochemical mechanism, the method designs a set of data dealing process to solve the SOC and T_bat changing and coupling problem during test and to consider the nonlinear characteristics of the batteries, consequently providing both OCV{SOC, T_bat} and R{SOC, I, T_bat} curves accurately. Compared with existing methods, the method gives more accurate and detailed results with less test time, thus more suitable for degradation evaluation application such as incremental capacity analysis. Test results have verified the advantages.

Key words： Lithium-ion batteries parameter estimation open circuit voltage internal resistance state of charge battery temperature

Received: 18 August 2017 Published: 14 September 2018

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TM912

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	Chen Yingjie
	Yang Geng
	Zu Haipeng
	Sun Xiaofeng

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Chen Yingjie,Yang Geng,Zu Haipeng等. An Open Circuit Voltage and Internal Resistance Estimation Method of Lithium-Ion Batteries with Constant Current Tests[J]. Transactions of China Electrotechnical Society, 2018, 33(17): 3976-3988.

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https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753.tces.171197 OR https://dgjsxb.ces-transaction.com/EN/Y2018/V33/I17/3976

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