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

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

Active Publication Date: 2022-06-03
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

Method used

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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 scheme of the present invention will be further described below in conjunction with the accompanying drawings and embodiments.

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[0051] The system noise and the measurement noise are uncorrelated zero-mean Gaussian white noise, and have noise statistical characteristics:

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[0093] In the formula, is the predicted measurement value at time k.

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[0119] Step 1.10, estimate the state estimate

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[0151] Step 1.15, calculate the smooth esti...

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Abstract

The invention discloses a lithium battery SOC estimation method, an active equalization control method and a system, which improve the working efficiency and service life of the battery pack. The lithium battery SOC estimation method described in the present invention uses a smoothing filter algorithm to improve the strong tracking square root volume filter algorithm, which solves the problems of low calculation accuracy and poor smoothness existing in the existing SOC algorithm, and at the same time reduces the burden of computer operations and improves The calculation efficiency is improved; for the charging process of multiple series battery packs and the current equalization process between batteries, an optimized equalization control method is proposed, and the SOC value calculated by the improved SOC estimation method is used as the control criterion, which further improves the accuracy of the equalization control The control effect of the lithium battery management system is enhanced.

Description

Lithium battery SOC estimation method, active equalization control method and system technical field The present invention relates to a kind of lithium battery charge and discharge management method, relate in particular to a kind of lithium battery SOC estimation method, active Balance control method and system. Background technique [0002] With the rapid development of electric vehicles, lithium batteries have become a Ideal power source for electric vehicles. In order to ensure the normal operation of the power battery, the battery management system needs to charge and discharge the power battery. The electrical process is controlled, thereby improving the working efficiency and service life of the battery pack. Lithium battery state of charge (SOC, State of Charge) can essentially reflect the inconsistency between lithium batteries, improve The high accuracy of SOC estimation is beneficial to enhance the control effect of the battery management system. In rece...

Claims

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Application Information

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Patent Type & Authority Patents(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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