Method and system for carrying out filtering estimation on charged states of lithium ion battery

A lithium-ion battery, state of charge technology, applied in the direction of measuring electricity, electric vehicles, measuring electrical variables, etc.

Active Publication Date: 2017-11-28
CHINA ELECTRIC POWER RES INST +2
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The present invention provides a method and system for filtering and estimating the state of charge of a lithium-ion battery, so as to solve the calculation problem of the SOC estimated value of the state of charge of the lithium-ion battery

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  • Method and system for carrying out filtering estimation on charged states of lithium ion battery
  • Method and system for carrying out filtering estimation on charged states of lithium ion battery
  • Method and system for carrying out filtering estimation on charged states of lithium ion battery

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Embodiment Construction

[0074] 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.

[0075] 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 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 over...

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Abstract

The invention discloses a method for carrying out filtering estimation on charged states of a lithium ion battery. The method comprises steps of acquiring parameter data of the surface of the lithium ion battery according to a preset time threshold, and establishing an equivalent circuit model of the lithium ion battery; acquiring a mathematical model of the lithium ion battery according to equivalent circuit model, acquiring parameters of the equivalent circuit model by use of a deviation compensation recursive least square algorithm and acquiring open-circuit voltage of the lithium ion battery; acquiring a state space model according to a model and the mathematical model of the lithium ion battery in a noise environment; estimating the charged states of the lithium ion battery by use of a Kalman filter recursive algorithm and acquiring a first charged state estimation value and a precision value of the Kalman filter; acquiring a second charged state estimation value by use of the H-infinite filter recursive algorithm; and calculating weights of the first charged state estimation value and the second charged state estimation value, and calculating a charged state estimation value of the lithium ion battery according to the weights.

Description

technical field [0001] The present invention relates to the field of metering electric vehicles, and more specifically, to a method and system for filtering and estimating the state of charge of a lithium-ion battery. Background technique [0002] The battery management system is an important part of the electric vehicle. In order to ensure that the battery can always maintain good performance under various working conditions of the electric vehicle, the battery management system needs to monitor the working status of the battery in real time and obtain information on battery performance and safety. The State of Charge (SOC) of the battery is one of the most important parameters in the battery management system. Its size directly reflects the state of the battery. Therefore, the accurate estimation method of SOC is a hot spot of current research. Accurate estimation of SOC can not only predict the mileage of the electric vehicle, limit the charge and discharge current, prev...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/36
CPCG01R31/367Y02T10/70
Inventor 于海波李贺龙徐英辉林繁涛王春雨刘佳王兴媛陈伟李立
Owner CHINA ELECTRIC POWER RES INST
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