A method and system for determining state of charge of lithium ion battery

A lithium-ion battery, state-of-charge technology, applied in the direction of measuring electricity, measuring electrical variables, testing electrical devices in transportation, etc. Estimating the state of charge of power lithium-ion batteries and other issues to achieve the effect of improving reliability and accuracy and saving time

Inactive Publication Date: 2020-05-19
CHINA ELECTRIC POWER RES INST +1
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0004] At present, there is no report on estimating the state of charge of the battery through dynamic impedance spectroscopy in the existing technology, and the detection efficiency and estimation accuracy of the existing technology are low, which needs to be optimized, and cannot meet the requirements of quickly and accurately estimating the state of charge of the power lithium-ion battery. Require

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  • A method and system for determining state of charge of lithium ion battery
  • A method and system for determining state of charge of lithium ion battery
  • A method and system for determining state of charge of lithium ion battery

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[0031] Exemplary embodiments of the present invention will now be described with reference to the drawings; however, the present invention may be embodied in many different forms and are not limited to the embodiments described herein, which are provided for the purpose of exhaustively and completely disclosing the present invention. invention and fully convey the scope of the invention to those skilled in the art. The terms used in the exemplary embodiments shown in the drawings do not limit the present invention. In the figures, the same units / elements are given the same reference numerals.

[0032] Unless otherwise specified, the terms (including scientific and technical terms) used herein have the commonly understood meanings to those skilled in the art. In addition, it can be understood that the terms defined by commonly used dictionaries should be understood to have consistent meanings in the context of their related fields, and should not be understood as idealized or ...

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Abstract

The invention discloses a method and system for determining the state of charge of a lithium ion battery, and belongs to the technical field of lithium ion batteries. The method comprises the following steps: charging a lithium ion battery subjected to primary standing at a current with a preset charging rate to a cut-off voltage; discharging the lithium ion battery subjected to secondary standingto a cut-off voltage at a current with a preset discharge rate, obtaining the state of charge of the lithium ion battery in the discharging process, and determining the dynamic impedance of the lithium ion battery in different states of charge; according to the dynamic impedance of the lithium ion battery in different states of charge, determining dynamic impedance spectrograms in different states of charge, and obtaining fitting parameters according to the dynamic impedance spectrograms; and extracting charge transfer resistance in the fitting parameters, and determining the state of chargeof the lithium ion battery according to the charge transfer resistance. According to the invention, the state of charge can be estimated by using the battery dynamic impedance test, the reliability and accuracy of state of charge estimation are improved, and the actual engineering application is facilitated.

Description

technical field [0001] The present invention relates to the technical field of lithium-ion batteries, and more particularly, to a method and system for determining the state of charge of a lithium-ion battery. Background technique [0002] With the increasingly serious energy shortage and environmental pollution, the development of new energy vehicles has become the focus of attention. Lithium-ion batteries are widely used in the field of new energy vehicles due to their high specific energy, long cycle life, and environmental protection. [0003] As the core of new energy vehicles, power lithium-ion batteries are effectively controlled and managed by the battery management system (BMS) of new energy vehicles to ensure safe and reliable driving of new energy vehicles. State of Charge (SOC) is One of the most important performance parameters in the working process of lithium-ion batteries, accurately estimating the state of charge can not only improve the service life of the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/387G01R31/378G01R31/389G01R31/367G01R31/00
CPCG01R31/387G01R31/378G01R31/389G01R31/367G01R31/006
Inventor 耿萌萌杨凯范茂松阮一钊张明杰刘皓高飞
Owner CHINA ELECTRIC POWER RES INST
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