Dynamic equivalent circuit model considering electrochemical characteristics of battery and operating method thereof

A technology of equivalent circuit model and working method, which is applied in the direction of measuring electricity, measuring electrical variables, instruments, etc., can solve the problem of poor accuracy of the battery model, and achieve the effect of complete model parameters and high model accuracy

Inactive Publication Date: 2017-08-18
SHANDONG UNIV
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Problems solved by technology

[0006] In order to solve the deficiencies of the prior art with poor accuracy of the battery model, the present inventio

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  • Dynamic equivalent circuit model considering electrochemical characteristics of battery and operating method thereof
  • Dynamic equivalent circuit model considering electrochemical characteristics of battery and operating method thereof
  • Dynamic equivalent circuit model considering electrochemical characteristics of battery and operating method thereof

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[0031] It should be noted that the following detailed description is exemplary and intended to provide further explanation of the present invention. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.

[0032] It should be noted that the terminology used here is only for describing specific embodiments, and is not intended to limit exemplary embodiments according to the present invention. As used herein, unless the context clearly dictates otherwise, the singular is intended to include the plural, and it should also be understood that when the terms "comprising" and / or "comprising" are used in this specification, they mean There are features, steps, operations, means, components and / or combinations thereof.

[0033] As introduced in the background technology, the prior art has the disadvantage of poor battery model accuracy. In order to solve ...

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Abstract

The invention discloses a dynamic equivalent circuit model considering electrochemical characteristics of a battery and an operating method thereof. The dynamic equivalent circuit model is a two-port network and comprises a voltage source Uoc varying along with the SOC (State of Charge), a resistor R0 representing ohmic internal resistance of the battery, a first RC parallel connection module representing SEI membrane impedance inside the battery and an embedded RC double-layer parallel connection module which are sequentially connected in series according to the current flowing direction, wherein the embedded RC double-layer parallel connection module is composed of a second RC parallel connection module, a resistor Rct and a double-layer capacitor Cdl, the second RC parallel connection module is connected with the resistor Rct in series and then connected with the double-layer capacitor Cdl in parallel, the second RC parallel connection module represents diffusion of ions inside the battery, the resistor Rct represents charge transfer, and the double-layer capacitor Cdl represents a capacitance characteristic that the ions transfer because of being subjected to influences of an electric field force and the density gradient inside the battery. Model parameters of dynamic equivalent circuit model have physical significance, part of the component parameters change along with the current, and a problem that a power battery model is low in cycle precision is solved.

Description

technical field [0001] The invention belongs to the field of battery modeling, and in particular relates to a dynamic equivalent circuit model and its working method considering the electrochemical characteristics of the battery. Background technique [0002] Compared with lead-acid batteries, lithium-ion batteries are favored in the field of electric vehicles and energy storage due to their higher energy density and power density, lower self-discharge rate, and long service life, especially in the electric vehicle market The continuous and rapid expansion of the industry has led to the rapid development of lithium-ion power batteries. However, while the lithium-ion power battery industry is growing rapidly, electric vehicle safety accidents frequently occur. According to statistics, there were nearly 40 new energy vehicle fire accidents at home and abroad in 2016, including products from well-known auto manufacturers such as Tesla and BYD. . The reason, in addition to ext...

Claims

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Application Information

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IPC IPC(8): G01R31/36
CPCG01R31/367
Inventor 张承慧周忠凯段彬商云龙崔纳新李岩康永哲
Owner SHANDONG UNIV
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