Variable order rc equivalent circuit model based on aic criterion and its realization method

Abstract

The invention discloses a variable tap-length RC equivalent circuit model and a realization method based on the AIC. According to the variable tap-length RC equivalent circuit model, an RC model is selected as a basic model, complexity and accuracy of the basic model are fully weighted in different SOCs on the basis of the AIC, the optimal RC tap length of each SOC is determined, the variable tap-length RC model is realized through control over toggle switches, the dynamic and static characteristics of a power battery are accurately simulated within all the working ranges through a model structure which is as simple as possible, engineering realization is easy, accuracy is high, and comprehensive optimization between model complexity and accuracy is achieved. According to the variable tap-length RC equivalent circuit model and the realization method based on the AIC, the dynamic and static characteristics of the power battery can be well simulated, and the variable tap-length RC equivalent circuit model and the realization method are applicable to the working condition of constant-current charging and discharging, the working condition of pulse charging and discharging and the working condition of UDDS circulation of the power battery.

Description

technical field [0001] The invention relates to a variable-order RC equivalent circuit model based on the AIC criterion. Background technique [0002] Many factors such as energy crisis, environmental pollution and energy security have once again pushed electric vehicles onto the stage of history, and have become the focus of attention all over the world. my country has also listed the electric vehicle industry as a new strategic industry that focuses on development, hoping to promote the structural adjustment and technological progress of my country's automobile industry through the development of electric vehicles, and finally realize the "curve overtaking" of the automobile industry. [0003] As a key component of electric vehicles, vehicle-mounted power batteries are crucial to the power, economy and safety of the vehicle, and are a key factor restricting the scale development of electric vehicles. Building an accurate battery model is of great significance to the ratio...

AI Technical Summary

Problems solved by technology

However, the second-order RC model has a large fitting error due to the low order of the model at the initial and final stages of battery charging and discharging, and cannot accurately simulate the dynamic and static characteristics of the battery.

Although increasing the series order of RC can improve the accuracy of the battery model and better simulate the charging and discharging characteristics of the power battery, if the order of the power battery model is too high, it will not be conducive to obtaining the parameters in the model, and will also Greatly increase the amount of calculation of the model, and even cause system shocks, so on the other hand, the order of RC should also be limited

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