Lithium-battery variable fractional order and equivalent circuit model and identification method thereof

An equivalent circuit model and fractional order technology, which is applied in electrical digital data processing, special data processing applications, instruments, etc., can solve problems such as large fluctuations in the model order, inconformity with the development laws of nature, and model accuracy limitations.

Active Publication Date: 2015-03-04
SHANDONG UNIV
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Problems solved by technology

However, this model is an integer-order battery model, and the switching of the model can only be an integer-order change, so the mode...

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  • Lithium-battery variable fractional order and equivalent circuit model and identification method thereof
  • Lithium-battery variable fractional order and equivalent circuit model and identification method thereof
  • Lithium-battery variable fractional order and equivalent circuit model and identification method thereof

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Embodiment Construction

[0099] The present invention is described in detail below in conjunction with accompanying drawing:

[0100] Building a battery model refers to applying mathematical theory to describe the response characteristics and internal characteristics of the actual battery as comprehensively as possible. The so-called response characteristic refers to the corresponding relationship between the terminal voltage of the battery and the load current; the internal characteristic refers to the relationship between the battery's internal variable ohmic internal resistance, polarization internal resistance and polarization voltage, SOC, and temperature.

[0101] Such as figure 1 Shown is the lithium battery fractional-order variable-order equivalent circuit model disclosed in the present invention, including a running time circuit and an I-V characteristic circuit, wherein the I-V characteristic circuit includes two branches, and each branch includes two groups of fractional-order capacitors F...

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Abstract

The invention discloses a lithium-battery variable fractional order and equivalent circuit model and an identification method thereof. The lithium-battery variable fractional order and equivalent circuit comprises a run time circuit and a battery I-V characteristic circuit, wherein a capacitor in the battery I-V characteristic circuit is a variable fractional order capacitor. A second order RC circuit model is generalized to a non-integer order, and the model parameters and the number of fractional order of different SOC are identified based on a least square method, so that the fractional order and equivalent circuit varying order according to the SOC is obtained. The instruction of fractional order realizes the continuous change of the order number of the model, so that the model is relatively stable, good in dynamic property and high in precision. The variation of fractional order realizes more freedom and more flexibility and innovation of the model. As the number of RC networks is not increased, the fractional order model effectively solves the contradiction between the accuracy and practicality of the model, is suitable for various working conditions of batteries, and has high practical value. The invention provides a precise battery model easy to realize for precise estimation of SOC.

Description

technical field [0001] The invention relates to a fractional-order variable-order equivalent circuit model of a lithium battery and an identification method thereof. Background technique [0002] In order to deal with the energy crisis and environmental pollution, electric vehicles have emerged as the times require and have become the focus of attention all over the world. 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. Lithium batteries have the advantages of high energy density, long service life, good cost performance and high single voltage, and gradually become one of the power sources of hybrid electric vehicles or pure electric vehicles. Accurate battery models are of great significance to the rational design and safe operation of vehicle-mounted power lithium batteries, and are the basis of battery SOC (st...

Claims

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Application Information

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IPC IPC(8): G06F17/50
Inventor 张承慧商云龙张奇崔纳新李泽元
Owner SHANDONG UNIV
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