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Lithium battery SOC estimation method, active equalization control method and system

A technology of active equalization and control method, applied in battery/fuel cell control devices, electric vehicles, control devices, etc., it can solve the problems of poor smoothness and low calculation accuracy, so as to reduce the burden, improve the calculation efficiency, improve the work efficiency and The effect of service life

Active Publication Date: 2021-05-07
NANJING INST OF TECH
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Problems solved by technology

[0005] Purpose of the invention: In view of the above problems, the present invention proposes a lithium battery SOC estimation method, an active equalization control method and system, which can solve the problems of low calculation accuracy and poor smoothness existing in the existing SOC algorithm, and further enhance the control of the battery management system Effect, realize the effective management of lithium power battery, improve the working efficiency and service life of the battery pack

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  • Lithium battery SOC estimation method, active equalization control method and system
  • Lithium battery SOC estimation method, active equalization control method and system
  • Lithium battery SOC estimation method, active equalization control method and system

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Embodiment Construction

[0044] The technical solutions of the present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0045] The method for estimating the lithium battery SOC of the present invention uses an improved strong tracking square root volume filter algorithm to estimate the battery SOC in real time. In this method, the smoothing filter algorithm is used to improve the strong tracking square root volumetric filtering algorithm, and the smoothing gain K s k , using a fixed interval smoothing filter mode, the filtering and smoothing process is iterative at the same time, to achieve real-time SOC estimation. figure 1 The improved algorithm flow is shown, including the following specific steps:

[0046] Step 1.1, as in figure 2 As shown, the process of how to combine the battery SOC estimation with the filtering algorithm is described in detail in combination with the Thevenin equivalent circuit model. Here only shows the state vari...

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Abstract

The invention discloses a lithium battery SOC estimation method, an active equalization control method and system. The working efficiency of a battery pack is improved, and the service life of the battery pack is prolonged. According to the lithium battery SOC estimation method, the smooth filtering algorithm is adopted to improve the strong tracking square root volume filtering algorithm, the problems that an existing SOC algorithm is low in calculation precision and poor in smoothness are solved, meanwhile, the burden of computer operation is relieved, and the calculation efficiency is improved; for the charging process of a plurality of series battery packs and the current equalization process between the batteries, an optimized equalization control method is provided, and an SOC value calculated by an improved SOC estimation method is used as a control criterion, so that the accuracy of equalization control is further improved, and the control effect of a lithium battery management system is enhanced.

Description

technical field [0001] The invention relates to a lithium battery charge and discharge management method, in particular to a lithium battery SOC estimation method, an active equalization control method and a system. Background technique [0002] With the rapid development of electric vehicles, lithium batteries have become an ideal power source for electric vehicles due to their advantages in energy density, power characteristics and service life. In order to ensure the normal operation of the power battery, the battery management system needs to control the charging and discharging process of the power battery, thereby improving the working efficiency and service life of the battery pack. [0003] Lithium battery state of charge (SOC, State of Charge) can essentially reflect the inconsistency between lithium batteries, and improving the accuracy of SOC estimation is conducive to enhancing the control effect of the battery management system. In recent years, with the rapid ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60L58/12B60L58/22
CPCB60L58/12B60L58/22B60L2240/54Y02T10/70
Inventor 周煜孟高军侯家乐段宇馨余昊晨程哲明朱钰杰
Owner NANJING INST OF TECH
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