Power battery SOC (state of charge) estimation system and method based on ARMAX (autoregressive-moving-average exogenous) model

A state of charge, power battery technology, applied in the direction of measuring electricity, measuring electrical variables, measuring devices, etc., can solve problems such as difficulties in establishing mathematical models of batteries, inaccurate estimation of power battery state of charge, etc.

Inactive Publication Date: 2018-01-12
GUANGDONG UNIV OF PETROCHEMICAL TECH
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Problems solved by technology

[0005] In order to overcome the following deficiencies in the prior art: 1. Difficulty in establishing a mathematical model of the storage battery; 2. Inaccurate estimation of the state of charge of the power battery of an electric vehicle, etc., the present invention discloses a state of charge estimation of the power battery based on the ARMAX model Method, in the estimation o

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  • Power battery SOC (state of charge) estimation system and method based on ARMAX (autoregressive-moving-average exogenous) model
  • Power battery SOC (state of charge) estimation system and method based on ARMAX (autoregressive-moving-average exogenous) model
  • Power battery SOC (state of charge) estimation system and method based on ARMAX (autoregressive-moving-average exogenous) model

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[0134] The technical solution of the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments, so that those skilled in the art can better understand the present invention and implement it, but the examples given are not intended to limit the present invention.

[0135] The present invention will be further described below in conjunction with the accompanying drawings.

[0136] A power battery state of charge estimation system based on the ARMAX model, including a Thevenin battery model establishment module, a parameter identification module and an SOC estimation module;

[0137] The Thevenin battery model building module is based on the RC structure to represent the polarization reaction of the battery, discretizes the Thevenin battery model, and introduces the ARMAX model;

[0138] The parameter identification module calculates the Thevenin battery model parameters based on the least square estimation ...

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Abstract

The invention discloses a power battery SOC (state of charge) estimation system and method based on ARMAX (autoregressive-moving-average exogenous) model. The method comprises the steps of representing polarization reaction of a battery base on RC (resistor-capacitor) structure, discretizing a Thevenin battery model, and introducing the ARMAX model; identifying parameters of the Thevenin battery model; calculating the parameters of the Thevenin battery model based on a least squares estimation method; establishing a following linear relationship between open-circuit voltage and SOC of the battery, and acquiring an estimated value of the SOC. The ARMAX model is introduced based on the RC equivalent circuit model; a recursive least squares method with forgetting factors is used to identify parameters of the model; the estimated value of SOC is found according to an OCU (Uoc)-SOC relation table, and accordingly, the problems of difficulty in establishing a battery mathematic model and precisely predicting SOC are solved; influences of model errors upon parameters are fully considered, and SOC estimation accuracy is improved.

Description

technical field [0001] The invention mainly relates to a system suitable for estimating the state of charge of a power lithium battery of an electric vehicle, and mainly belongs to the technical field of intelligent control. Background technique [0002] With the increasingly prominent problems of energy crisis and environmental pollution, lithium batteries have gradually replaced traditional batteries due to their advantages such as high energy density, high working voltage, high specific energy, low pollution, low self-discharge rate and no memory effect. In automotive, aerospace, shipbuilding and other fields. In order to prevent the occurrence of battery overcharge and overdischarge, prolong the service life of the battery, and improve the performance and safety of the vehicle, the battery management system is required to be able to accurately estimate the battery state of charge (State of Charge, SOC) in real time, so accurate Battery models and SOC estimation methods ...

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Application Information

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IPC IPC(8): G01R31/36
Inventor 言理傅树霞李伟明陈康伟张锋
Owner GUANGDONG UNIV OF PETROCHEMICAL TECH
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