Method of estimating state of charge of lithium battery

A state-of-charge, lithium battery technology, applied in the direction of measuring electricity, measuring electrical variables, measuring devices, etc., can solve the problem of inaccurate battery charge estimation, and achieve the effect of accurate estimation and clever idea

Inactive Publication Date: 2017-12-22
SOUTHWEST JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to address the above-mentioned deficiencies in the prior art, and provide a method for estimating the state of charge of a lithium battery, so as to solve the problem of inaccurate battery charge estimation in the prior art

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  • Method of estimating state of charge of lithium battery
  • Method of estimating state of charge of lithium battery
  • Method of estimating state of charge of lithium battery

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Embodiment Construction

[0061] The specific embodiments of the present invention are described below so that those skilled in the art can understand the present invention, but it should be clear that the present invention is not limited to the scope of the specific embodiments. For those of ordinary skill in the art, as long as various changes Within the spirit and scope of the present invention defined and determined by the appended claims, these changes are obvious, and all inventions and creations using the concept of the present invention are included in the protection list.

[0062] According to an embodiment of the present application, such as Figure 1-3 As shown, the lithium battery state-of-charge estimation method of this scheme includes

[0063] S1, establish the second-order RC equivalent circuit of the battery, and establish the equivalent state equation model according to the equivalent circuit:

[0064]

[0065]

[0066] Among them, U1 and U2 are the voltages at both ends of C1 an...

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Abstract

The present invention discloses a method of estimating the state of charge of a lithium battery. The method comprises the steps of establishing a second-order RC equivalent circuit of the battery, and establishing an equivalent state equation model according to the equivalent circuit; adopting a fractional order capacitance model to substitute for the capacitors C1 and C2 in the step S1; combing a second-order RC equivalent circuit state equation with the fractional order calculus to obtain a fractional order second-order RC equivalent circuit state equation; combining the fractional order second-order RC equivalent circuit state equation with an ampere-hour integral method to obtain a continuous fractional order second-order RC model, and discretizing the continuous fractional order second-order RC model to obtain a discrete fractional order second-order RC model; combining the discrete fractional order second-order RC model with a fractional order unscented Kalman filter, and estimating the state of charge of the battery according to the probability distribution of the sampling points.

Description

technical field [0001] The invention belongs to the technical field of battery charge estimation methods, and in particular relates to a method for estimating the state of charge of a lithium battery. Background technique [0002] In view of the world's excessive energy consumption and environmental damage, replacing conventional fossil fuel vehicles with electric vehicles and hybrid vehicles is currently the main means for various countries to deal with these problems in the field of transportation. [0003] One of the key components of electric vehicles and hybrid vehicles is the battery management system (Battery Management System). A complete battery management system can avoid inaccurate charging and discharging of the battery that may occur during the driving process of the vehicle, and at the same time improve the working efficiency of the battery. The estimation of the state of charge of the battery in the battery management system is an important factor affecting th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/36
CPCG01R31/367
Inventor 黄德青陈翼星康鑫奥韦斯·沙哈
Owner SOUTHWEST JIAOTONG UNIV
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