Method and system for improving SOC calculation precision of electric vehicle power battery

A technology of power battery and calculation accuracy, applied in the direction of measuring electricity, measuring electrical variables, instruments, etc., can solve the problem of increasing cumulative error, and achieve the effect of reducing cumulative error and ensuring time synchronization

Active Publication Date: 2017-11-10
SHANDONG UNIV
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Problems solved by technology

This method is simple to use, but it needs to predict the initial capacity of the battery pack, and the cumulative error will continue to increase as the number of charging times increases.

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  • Method and system for improving SOC calculation precision of electric vehicle power battery

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Embodiment Construction

[0025] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0026] It should be pointed out that the following detailed description is exemplary and intended to provide further explanation to the present application. 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 application belongs.

[0027] It should be noted that the terminology used here is only for describing specific implementations, and is not intended to limit the exemplary implementations according to the present application. 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 combinatio...

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Abstract

The invention discloses a method and a system for improving the SOC calculation precision of an electric vehicle power battery. According to the invention, the method comprises the steps of acquiring the voltage of each battery, determining a limit monomer battery, measuring the limit voltage, calling the current of the corresponding time, recognizing model parameters to obtain an open-circuit voltage, predicting a stable open-circuit voltage after standing for a period of time, obtaining an SOCnew according to the SOCSnew-OCV relationship, and updating the SOCnew in the ampere-hour integral method. according to the invention, the open-circuit voltage method, the model method, the ampere-hour integral method and the prediction are combined. The SOCnew in the ampere-hour integral method is continuously updated, namely the initial SOC. Therefore, the accumulative error is reduced.

Description

technical field [0001] The invention relates to an electric vehicle battery management system, in particular to a method and system for improving the calculation accuracy of the SOC of an electric vehicle power battery. Background technique [0002] As one of the core components of the automotive battery system, the battery management system (Battery Management System, BMS) can prevent the battery from overcharging or overdischarging, maintain the internal consistency of the battery pack, and make the battery work in a healthy state to prolong its working life. effect. In the battery management system, the estimation of the battery state of charge (State of Charge, SOC) is one of the main tasks of the BMS, and its accuracy will affect the control strategy of other vehicle components such as the vehicle controller and the driver's operation judgment. At this stage, the optimization research on the SOC estimation algorithm has always been a hot and difficult point in the fiel...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/36
CPCG01R31/367
Inventor 程勇姜敏冯普
Owner SHANDONG UNIV
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