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Lithium ion battery model parameter identification method based on continuous impulse response

A lithium-ion battery and model parameter technology, which is applied in the direction of measuring electricity, measuring electrical variables, and measuring devices, can solve problems such as complex algorithms and differential calculations, and achieve good response effects, small data volumes, and better fitting effects Effect

Active Publication Date: 2021-02-09
BEIJING JIAOTONG UNIV +1
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Problems solved by technology

The fractional order model can better describe the dispersion effect of the battery and make the model more accurate, but requires more complex algorithms and differential calculations

Method used

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  • Lithium ion battery model parameter identification method based on continuous impulse response
  • Lithium ion battery model parameter identification method based on continuous impulse response
  • Lithium ion battery model parameter identification method based on continuous impulse response

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Embodiment Construction

[0068] The present invention will be described in further detail below in conjunction with the accompanying drawings. The detailed description, which is a description made in conjunction with exemplary embodiments of the present invention, includes various details of the embodiments of the present invention to facilitate understanding, and they should be considered as exemplary only. Accordingly, those of ordinary skill in the art will recognize that various changes and modifications of the embodiments described herein can be made without departing from the scope and spirit of the invention. Also, descriptions of well-known functions and constructions are omitted in the following description for clarity and conciseness.

[0069] Such as Figure 8 As shown, the lithium-ion battery model parameter identification method based on the continuous impulse response of the present invention includes the following steps:

[0070] S1. Apply continuous current pulses to the lithium-ion ...

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Abstract

The invention relates to a lithium ion battery model parameter identification method based on continuous impulse response. The method comprises the following steps: S1, obtaining an SOC-OCV curve of alithium ion battery; applying continuous current pulses to the lithium ion battery cell to obtain ohmic impedance R0; s2, based on the second-order RC equivalent circuit model of the battery, establishing an equation set about parameters of the second-order RC equivalent circuit model of the battery, and solving an analytical solution as an initial value of the to-be-identified parameters; s3, separating out polarization voltage outside ohmic polarization of the battery; and S4, identifying a polarization resistor Rp1, a polarization resistor Rp2, a polarization capacitor Cp1 and a polarization capacitor Cp2 of the second-order RC equivalent circuit model of the lithium ion battery by using a least square method. According to the method, the second-order RC equivalent circuit model is used, the model is simple, the data size required for parameter identification is small, high identification precision can be guaranteed, the use requirement is met, and the response effect of fitting continuous current pulse excitation is good.

Description

technical field [0001] The invention relates to the field of modeling of lithium-ion batteries, in particular to a method for identifying parameters of lithium-ion battery models based on continuous impulse responses. Background technique [0002] Under the dual pressure of energy crisis and environmental protection, electric vehicles have been vigorously developed. Lithium-ion batteries have become the first choice for electric vehicle power batteries due to their advantages of high energy density, long service life and environmental friendliness. In order to accurately predict those parameters that characterize battery performance that cannot be directly measured, it is necessary to develop a model (Li-ion battery model) applicable to different situations. [0003] Currently, there are three commonly used lithium-ion battery models: [0004] (1) A first-principles based electrochemical model that can not only reflect potential changes in the charging process, but also de...

Claims

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Application Information

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IPC IPC(8): G01R31/367
CPCG01R31/3648G01R31/367
Inventor 王志伟何锡添臧晓艳孙丙香徐晖黄彧
Owner BEIJING JIAOTONG UNIV
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