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Lithium ion battery online quick capacity estimation method based on capacity increment analysis

A lithium-ion battery and capacity increment technology, applied in the field of electric vehicle energy storage batteries, can solve the problems of affecting estimation accuracy, long time, slow data processing speed, etc., and achieve the effect of high capacity estimation accuracy and strong algorithm adaptability

Active Publication Date: 2020-05-12
TONGJI UNIV
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Problems solved by technology

[0006] However, the main problems of this method at present are: first, the speed of data processing is too slow, and it takes a long time to obtain a complete capacity increment curve; second, in the current application of this method, only a single capacity increment curve is considered feature, thus affecting the estimation accuracy

Method used

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  • Lithium ion battery online quick capacity estimation method based on capacity increment analysis
  • Lithium ion battery online quick capacity estimation method based on capacity increment analysis
  • Lithium ion battery online quick capacity estimation method based on capacity increment analysis

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Embodiment

[0044] The present invention provides a lithium-ion battery rapid capacity estimation method based on capacity increment analysis. The method is based on off-line measured voltage and current data for processing, and obtains capacity increment curve based on Kalman filter processing, and obtains capacity increment curve characteristics and battery The relationship between capacities, and comprehensively consider multiple curve features for battery capacity estimation,

[0045] Main method flow process of the present invention is as figure 1 As shown, it specifically includes the following steps:

[0046] S1, according to the recommended working environment temperature and charging and discharging current of the battery, design the accelerated aging test of the battery;

[0047] In step S1, the theoretical basis of the present invention is that there is a correlation between the battery capacity and the characteristics of the capacity increment curve, so it is necessary to obt...

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Abstract

The invention relates to a lithium ion battery online quick capacity estimation method based on capacity increment analysis. The method comprises the following steps: 1) acquiring battery acceleratedaging and standard charging working condition data; 2) obtaining a capacity increment curve offline and determining a relationship between curve characteristics and battery capacity. According to themethod, Kalman filtering is used for processing the capacity increment curve, the processing speed is high, multiple characteristics are used for estimating the battery capacity, and compared with anexisting method adopting a single characteristic, the method is more reasonable, comprehensive and accurate.

Description

technical field [0001] The invention relates to the field of energy storage batteries for electric vehicles, in particular to an online rapid capacity estimation method for lithium-ion batteries based on capacity increment analysis. Background technique [0002] With the development of clean energy technology and the trend of electrification of vehicles, lithium-ion batteries have become a research hotspot for vehicle manufacturers, universities and scientific research institutions due to their excellent performance and environmental friendliness. Battery capacity is one of the key parameters of lithium-ion batteries and is the input of other key states of the battery, but it decays nonlinearly during battery use, which brings great troubles to researchers and drivers. Therefore, research on battery capacity acquisition and estimation is increasing. [0003] Under laboratory conditions, battery capacity is usually obtained by capacity calibration experiments. Discharge the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/388H01M10/0525
CPCG01R31/388H01M10/0525Y02E60/10
Inventor 戴海峰魏学哲姜波李亚东
Owner TONGJI UNIV
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