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Lithium battery dynamic impedance parameter identification method based on equivalent circuit model

An equivalent circuit model and parameter identification technology, applied in the direction of measuring resistance/reactance/impedance, measuring electricity, measuring electrical variables, etc., it can solve the problems that the model cannot be applied to the working current, and the influence of charging and discharging current is not considered, and achieves strong practicality. The operability and the effect of improving the accuracy

Active Publication Date: 2015-08-19
NAT UNIV OF DEFENSE TECH
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Problems solved by technology

However, most of the current equivalent circuit models do not consider the influence of charge and discharge current on the equivalent internal resistance and equivalent capacitance, which will cause the model to be inapplicable to a wide range of operating currents

Method used

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  • Lithium battery dynamic impedance parameter identification method based on equivalent circuit model
  • Lithium battery dynamic impedance parameter identification method based on equivalent circuit model
  • Lithium battery dynamic impedance parameter identification method based on equivalent circuit model

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Embodiment Construction

[0023] The present invention will be further described below in conjunction with specific embodiments.

[0024] The present invention is based on the figure 1 In the equivalent circuit, consider that the impedance of the battery is not only related to the state of charge of the battery, temperature and other factors, but also related to the charge and discharge current. The invention can estimate the dynamic impedance of the lithium battery under different charging states and charging and discharging conditions online through the simple and feasible charging and discharging test of the lithium battery, and obtain a simple and practical battery model on this basis. Among them, according to the measured data, it is found that the resistance R 1 , R 2 The resistance value of the battery is related to many factors, especially related to SOC and charge and discharge current, which has a great effect on the correct establishment of the battery equivalent circuit model. However, mo...

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Abstract

A lithium battery dynamic impedance parameter identification method based on an equivalent circuit model is disclosed. Firstly, a charge / discharge system is made based on a first order RC equivalent circuit; a charge / discharge test on a to-be-tested lithium battery is carried out according to the charge / discharge system; and test data is obtained, and parameters are extracted. According to the invention, online estimation of dynamic internal resistance of a lithium battery in different charged states and charge / discharge conditions can be conducted, and a battery module which is simple and practical can be obtained on the basis. The invention takes correlation of impedance and charge / discharge current into consideration, improves the accuracy of lithium battery impedance parameter extraction, provides a simple and feasible charge / discharge test method and a specific parameter extraction algorithm, and has high practical operability.

Description

technical field [0001] The invention belongs to the technical field of lithium battery state estimation, and specifically relates to a method for accurately modeling the charge and discharge characteristics of a lithium battery cell based on dynamic impedance, and then realizing the state estimation of the cell or a battery pack. Background technique [0002] As an important energy storage carrier in the power system, lithium batteries have received great attention from the industry in the development of their technology and management methods. Due to its high energy density and long life, lithium batteries are widely used in portable electronic devices such as mobile phones, digital cameras, and tablet computers, as well as in energy storage systems for electric vehicles and smart grids. [0003] In order to optimally design and manage lithium battery-based energy storage systems, accurate models are first required to describe the charging and discharging characteristics of...

Claims

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Application Information

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IPC IPC(8): G01R31/36G01R27/02
Inventor 孙权潘正强冯静周星程龙刘天宇黄彭奇子
Owner NAT UNIV OF DEFENSE TECH
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