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Method of estimating SOC and impedance of lithium battery on line

A technology of lithium battery and estimated value, which is applied in the field of battery identification and estimation to achieve the effect of improving accuracy, high precision and improving precision

Inactive Publication Date: 2018-01-16
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

[0005] In view of the above problems or deficiencies, in order to solve the problem of online estimation of SOC accuracy and battery life

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  • Method of estimating SOC and impedance of lithium battery on line
  • Method of estimating SOC and impedance of lithium battery on line
  • Method of estimating SOC and impedance of lithium battery on line

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Embodiment Construction

[0017] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0018] The Kalman filter algorithm is more dependent on the battery model, and a model that can more accurately describe the internal charging and discharging characteristics of the battery is particularly important. At present, the Thevenin (Thevenin) equivalent circuit model of the battery is commonly used to describe the charging and discharging characteristics of the battery. Commonly used Thevenin equivalent circuit models include simple models, first-order RC models and second-order RC models. In the case of weighing computational complexity and accuracy, the first-order RC model reduces computational complexity compared to the second-order model while ensuring accuracy. , and describe the internal characteristics of the battery more accurately than the simple model.

[0019] Among them, U oc is the open circuit voltage of the battery,...

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Abstract

The invention belongs to the battery identification and estimation field, and specifically relates to a method of estimating SOC (State of Charge) and impedance of a lithium battery on line. The method of estimating SOC and impedance of a lithium battery on line can improve the accuracy of a batter model equation so as to improve the accuracy of the Kalman filtering algorithm, by adding the impedance parameters, such as the direct current impedance, the polarized capacitance and the polarized resistance of the lithium battery, into the battery model equation, and can optimize the deficiency that the accuracy of the traditional Kalman filtering algorithm depends on the model accuracy. And at the same time, the method of estimating SOC and impedance of a lithium battery on line enables the dynamically changed impedance parameters to participate in every SOC estimation process, so that the estimated value of the battery residual electric quantity can have higher accuracy. At last, the method of estimating SOC and impedance of a lithium battery on line can obtain the reference value of the current healthy state for the lithium battery by referring to the corresponding battery electrochemistry impedance spectrum, thus being conductive to assisting the user to preferably master the current service life of the lithium battery by estimating the impedance parameters obtained through real time estimation. The method of estimating SOC and impedance of a lithium battery on line can realize high accuracy of estimating SOC and the service life of the lithium battery on line.

Description

technical field [0001] The invention belongs to the field of battery identification and estimation, in particular to a method for online estimation of the SOC and impedance of a lithium battery. Background technique [0002] As an excellent secondary power source, batteries have been widely used by the society. Especially in the past few years, with the rapid development of lithium battery technology, the application scenarios of lithium batteries have become more and more extensive. Lithium batteries have the advantages of high energy density, no pollution, high cycle life, and no memory effect. They are used in energy storage power systems such as hydraulic, thermal, wind, and solar power stations, as well as electric tools, electric bicycles, electric motorcycles, and electric vehicles. , aerospace and other fields. In recent years, in response to the energy crisis and climate issues, the use of electric vehicles to replace traditional vehicles has been promoted by the s...

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Application Information

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IPC IPC(8): G01R31/36
Inventor 向勇曹健冯雪松
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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