SOC online detection and correcting method preventing lithium ion battery from over discharging

A lithium-ion battery, V-SOC technology, applied in the direction of measuring electricity, measuring devices, measuring electrical variables, etc., can solve problems such as inaccurate SOC estimation, achieve the effects of preventing battery over-discharge, improving accuracy, and improving use safety

Active Publication Date: 2014-06-25
DONGFANG ELECTRIC CORP LTD
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  • Abstract
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Problems solved by technology

[0006] The present invention aims at the problem of inaccurate SOC estimation caused by the inconstant discharge rate in the actual application of the battery, and provides an SOC online detection and correction method for preventing over-discharge of the lithium-ion battery. The correction method, through the processing of different rate discharge curves, obtains a unified judgment condition, and corrects the estimated value of the battery SOC accordingly

Method used

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  • SOC online detection and correcting method preventing lithium ion battery from over discharging
  • SOC online detection and correcting method preventing lithium ion battery from over discharging
  • SOC online detection and correcting method preventing lithium ion battery from over discharging

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Embodiment

[0041]Embodiments An SOC online detection and correction method for preventing over-discharge of lithium-ion batteries comprises the following steps:

[0042] A. Obtain the V-SOC curves under different discharge rates through the following steps:

[0043] (1) Fully charge the 11 Ah lithium manganate lithium titanate (MT) battery by using the constant current to constant voltage method, the constant current value is 11 A (1C charging), the maximum voltage threshold is 2.8 V, and the minimum current threshold is 0.15 A ;

[0044] (2) Use the battery test cabinet to measure and record the change of the battery voltage with the discharge time of the fully charged battery at different discharge rates (1C, 2C, 3C, 4C, 5C), and the change of the battery discharge power with the discharge time , the data acquisition time interval is 3 s;

[0045] (3) According to the above-mentioned change of battery discharge power with discharge time, use the formula , calculate the battery SOC,...

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Abstract

The invention discloses an SOC online detection and correcting method preventing a lithium ion battery from over discharging. The SOC online detection and correcting method does not depend on the discharge rate. Through processing of different rate discharge curves, a uniform determination condition is obtained, and the SOC estimated value of the battery is collected according to uniform determination condition. By means of the method, battery SOC can be accurately estimated, battery over-discharge feature points are determined, electricity of the battery is fully utilized, and the service life of the battery is prolonged.

Description

technical field [0001] The invention relates to the technical field of battery management systems and electric vehicle power supply equipment, in particular to an SOC online detection and correction method for preventing lithium-ion batteries from being over-discharged. Background technique [0002] Traditional energy sources are becoming increasingly depleted and environmental pollution is becoming more and more serious. In order to cope with the energy crisis and slow down global warming, countries around the world have successively proposed policies for energy conservation, emission reduction and the development of a low-carbon economy. Lithium-ion batteries have the advantages of high energy density, small self-discharge, long cycle life, low environmental pollution, and no memory effect. Power grid peak shaving, extension of residential power storage facilities. [0003] The state of charge (State of Charge, SOC) is a very important indicator in the process of battery ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/36
Inventor 蒋兴莉谢皎阮晓莉蒋正伟
Owner DONGFANG ELECTRIC CORP LTD
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