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Lithium battery fractional order discretization impedance model

An impedance model, lithium battery technology, applied in electrical digital data processing, special data processing applications, instruments, etc., can solve problems such as complex models

Inactive Publication Date: 2015-11-11
XI AN JIAOTONG UNIV
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Problems solved by technology

The electrochemical model uses the electrochemical characteristics of the battery body to model the battery from the perspective of electrochemical kinetics. The electrochemical model needs to fully consider the internal electrochemical reactions of the battery when it is working, and requires knowledge of complex electrochemical theory. The model generally more complex

Method used

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  • Lithium battery fractional order discretization impedance model
  • Lithium battery fractional order discretization impedance model
  • Lithium battery fractional order discretization impedance model

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Embodiment Construction

[0057] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0058] as attached figure 1 Shown, a kind of lithium battery fractional order discretization impedance model of the present invention comprises the following steps:

[0059] 1) The equivalent circuit model of lithium battery is as attached figure 2 As shown, including the parallel combination of the resistor, the first resistor and the first normal phase element CPE, and the parallel combination of the second resistor and the second normal phase element CPE, the three are connected in series in sequence;

[0060] Among them, the lithium battery equivalent circuit model is expressed by the following formula:

[0061] -I=C 1 ·Δ α V 1 +V 1 / R 1 =C 2 ·Δ β V 2 +V 2 / R 2

[0062] V ser =-R ser · I

[0063] V o =V OCV +V ser +V 1 +V 2

[0064] R 1 - the resistance in the parallel combination of the first resistance and the first...

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Abstract

The invention discloses a lithium battery fractional order discretization impedance model, which is used for describing strong-nonlinearity electrochemical reaction of a lithium battery as a simple mathematical model. The fractional order discretization impedance model is built by the following steps of: 1) building a lithium battery equivalent circuit model, wherein the model comprises impedance, a parallel combination of a first resistor and a first constant phase element (CPE) and a parallel combination of a second resistor and a second CPE, and all the three are orderly connected in series; 2) introducing G-L fractional order calculus definition according to the built lithium battery equivalent circuit model, and building a lithium battery fractional order impedance model; 3) discretizing the built lithium battery fractional order impedance model based on the G-L fractional order calculus definition, and thereby obtaining the lithium battery fractional order discretization impedance model.

Description

Technical field: [0001] The invention relates to a fractional discretized impedance model of a lithium battery, which is used to describe the strong nonlinear electrochemical reaction inside the lithium battery as a simple mathematical model. Background technique: [0002] The power system of electric vehicles is provided by batteries. Its characteristics of zero emissions on the road and low energy consumption are increasingly recognized and valued by all walks of life. From the perspective of economy and safety, electric vehicles can use lithium batteries as electric vehicles. source of power. [0003] Batteries are strongly nonlinear electrochemical systems, and there is no universal model that can be applied to all fields. Battery models can be mainly divided into two categories, namely electrochemical models and equivalent circuit models. The electrochemical model uses the electrochemical characteristics of the battery body to model the battery from the perspective of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
Inventor 杨晴霞徐俊曹秉刚李秀青宁博王斌
Owner XI AN JIAOTONG UNIV
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