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METHOD AND SYSTEM FOR ESTIMATING SOC OF POWER BATTERY ON THE BASIS OF DYNAMIC PARAMETERS
METHOD AND SYSTEM FOR ESTIMATING SOC OF POWER BATTERY ON THE BASIS OF DYNAMIC PARAMETERS
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机译：基于动态参数估算动力电池SOC的方法和系统
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摘要
Provided are a method and system for estimating SOC of a power battery on the basis of dynamic parameters. The method comprises the following steps: performing a discharging-standing experiment on the battery to obtain an OCV-SOC characteristic curve of the battery at different temperatures, and performing fitting to obtain an OCV-SOC relationship expression; performing a pulse discharging-standing experiment on the battery with a constant current and recording the voltage response during the experiment, and identifying, by using an offline method, an initial parameter value of a second-order RC equivalent circuit model of the battery according to an obtained voltage response curve; performing dynamic parameter identification on the second-order RC equivalent circuit model by using a recursive least-squares method containing a forgetting factor; and performing online estimation of the SOC of the battery by using an EKF algorithm. The estimation method prevents inaccurate SOC initial values and accumulated errors in the ampere-hour integral method, adapts to dynamic changes of battery characteristics, has a high accuracy battery model and high convergence rate, is stable and reliable, improves the accuracy of SOC online estimation, and can be widely used in the field of electric automobiles and energy storage battery management systems.
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