Fractional-order KiBaM-equivalent circuit comprehensive characteristic battery model and parameter identification method thereof

Abstract

The invention relates to a fractional-order KiBaM electrochemical and fractional-order equivalent circuit comprehensive characteristic battery model and a parameter identification method thereof. A model is modeled by a fractional calculus principle so as to be provided with more degree of freedom and more flexibility and innovation. The introduction of the fractional order provides many new phenomena and rules and achieves superiority that cannot be achieved by a conventional integer-order battery model. The KiBaM electrochemical model and the equivalent circuit model are both generalized to the fractional order. Model parameters and orders at different SOC positions are identified on the basis of the least square method. Thus, a variable-order fractional-order battery model based on SOC is obtained so as to realize the advantage complementation of the battery KiBaM electrochemical model and the second-order RC equivalent circuit model. The nonlinear capacity effect and the running time and the output I-V external characteristics of the battery can be described simultaneously, the comprehensive simulation of the internal characteristics and the external characteristics of the power battery is achieved, and a high application value is achieved.

Description

technical field [0001] The invention belongs to the technical field of battery state estimation and performance evaluation, and in particular relates to a fractional-order KiBaM-equivalent circuit comprehensive characteristic battery model and a parameter identification method. Background technique [0002] At present, electric vehicles have become the main direction of future automobile development, but on-board power batteries are the main bottleneck restricting the scale development of electric vehicles. An accurate battery model is of great significance to the rational design and safe operation of vehicle power batteries, and is the basis for battery state estimation and performance evaluation. [0003] However, it is not easy to establish an accurate and simple battery model. The reason is that the internal chemical reactions of power batteries are very complex, highly nonlinear and uncertain. The battery model has been developed to the present stage. According to the ...

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Problems solved by technology

[0009] In order to solve the above problems, the present invention overcomes the battery model modeling problem of how to take into account the nonlinear characteristics of the available capacity of the battery and the electrical characteristics of the I-V output in the prior art, and how to realize the correlation and comprehensive simulation of the external characteristics and internal characteristics of the battery. The problem is to provide a fractional-order KiBaM-equivalent circuit comprehensive characteristic battery model and parameter identification method, which realizes the complementary advantages of the battery KiBaM electrochemical model and the second-order RC equivalent circuit model, and can simultaneously describe the nonlinear capacity effect and Running time and output I-V external characteristics, realize comprehensive simulation of internal and external characteristics of power battery

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