SOC online detection and correction method for lithium ion battery in charging process

A lithium-ion battery, charging process technology, applied in secondary battery charging/discharging, secondary battery repair/maintenance, measurement of electricity, etc., can solve problems such as inaccurate SOC estimation

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

[0008] Aiming at the problem of inaccurate SOC estimation caused by the inconstant charging rate in the charging process of the battery, the present invention provides an online SOC detection and correction method for lithium-ion batteries in the charging process. The method proposes an online SOC independent of the charging rate Detection and Correction Methods

Method used

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  • SOC online detection and correction method for lithium ion battery in charging process
  • SOC online detection and correction method for lithium ion battery in charging process
  • SOC online detection and correction method for lithium ion battery in charging process

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Embodiment

[0044] Embodiment The SOC online detection and correction method of a lithium-ion battery during charging includes the following steps:

[0045] A. Obtain the V-SOC curves under different charging ratios, through the following steps:

[0046] (1) Discharge the 11 Ah lithium manganate lithium titanate (MT) battery by constant current discharge method, the constant current value is 11 A (1C discharge), and the minimum voltage threshold is 1.8 V;

[0047] (2) Use the battery test cabinet to measure and record the change of the battery voltage with the charging time under different charging rates (1C, 2C, 3C, 4C, 5C), and the change of the battery charging power with the charging time In this case, the data acquisition time interval is 10 s, the charging process adopts the constant current to constant voltage mode, the maximum voltage threshold is 2.8 V, and the minimum current is 0.15 A;

[0048] (3) According to the above-mentioned change of battery charging power with charging...

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Abstract

The invention discloses an SOC online detection and correction method for a lithium ion battery in the charging process. The SOC online detection and correction method does not rely on charging multiplying power. Uniform judging criteria are obtained by processing charging curves of different multiplying powers, and SOC estimation values of the battery are corrected according to the judging criteria. Through the adoption of the method, the SOC of the battery can be estimated accurately, the overcharging feature point of the battery can be judged, the electric quantity of the battery is fully used, and meanwhile the service life of the battery is prolonged.

Description

technical field [0001] The invention relates to the technical field of electric vehicle power supply equipment and a battery management system, in particular to an online SOC detection and correction method for a lithium-ion battery during charging. Background technique [0002] In order to cope with the energy crisis and the increasingly serious environmental pollution, countries around the world have successively proposed policies for energy conservation, emission reduction and the development of a low-carbon economy. With its advantages of high efficiency, cleanliness and safety, electric vehicles have entered people's field of vision and are promoted by governments of various countries. Commonly used batteries for electric vehicles include lead-acid batteries, nickel-cadmium batteries, nickel-metal hydride batteries and lithium-ion batteries. Lithium-ion batteries have become the first choice for more and more electric vehicle batteries due to their advantages such as h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/36H01M10/44
CPCY02E60/10
Inventor 蒋兴莉谢皎阮晓莉蒋正伟
Owner DONGFANG ELECTRIC CORP LTD
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