A State of Charge Estimation Algorithm for Lithium Batteries

A technology of state of charge and estimation algorithm, applied in the direction of measuring electricity, measuring electrical variables, instruments, etc., can solve the problems of estimation error and unrealistic state of charge, and achieve the effect of improving accuracy, ensuring effectiveness, and ensuring accuracy

Active Publication Date: 2020-11-24
湖南栏海电气工程有限公司
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Problems solved by technology

This method relies on accurate open circuit voltage measurement, and it is impractical to leave the battery open circuit for several hours to obtain accurate open circuit voltage measurement
In addition, due to the voltage plateau of lithium batteries, even a small deviation in voltage measurement will bring large errors to the estimation of the state of charge in the charging and discharging interval between 20% and 80% of the state of charge.

Method used

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  • A State of Charge Estimation Algorithm for Lithium Batteries
  • A State of Charge Estimation Algorithm for Lithium Batteries
  • A State of Charge Estimation Algorithm for Lithium Batteries

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Embodiment Construction

[0045] The specific implementation manners of the embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation manners described here are only used to illustrate and explain the embodiments of the present invention, and are not intended to limit the embodiments of the present invention.

[0046] Such as figure 1 As shown, in one embodiment of the present invention, two estimators are respectively based on the equivalent circuit model and the data-driven battery model, and the weight calculation and the fusion of the final estimation results are included. The key links include: second-order RC equivalent circuit model, partial least squares model, Kalman filter, Akaike weight calculation, etc. Such as figure 1 As shown, the measured value of the current I t and state of charge The estimated value of is used as the input of two battery models, and the output of ...

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Abstract

The invention belongs to the field of lithium batteries and discloses a state of charge estimation algorithm for a lithium battery monomer. A second-order RC equivalent circuit model is used to ensurethe basic accuracy of battery modeling, the prior knowledge of the battery is effectively used, and besides, the high efficiency of partial least square calculation is used, a data-driven model of the battery is quickly established in an online mode, the problem of difficult online updating of parameters of the traditional second-order RC equivalent circuit model can be effectively solved, and the accuracy of battery model modeling under complex conditions is improved. The final state of charge of the battery integrates the estimation results of two battery models, and the limitation of the accuracy of using a single model under various complex conditions is avoided. Essentially, the estimation accuracy of the battery state of charge under complex working conditions such as an electric vehicle can be improved.

Description

technical field [0001] The invention relates to a charge state estimation algorithm of a lithium battery cell. Background technique [0002] Due to the limited voltage and energy that a battery cell can provide, hundreds of thousands of battery cells are connected in series and parallel to form a battery pack to provide energy for electric vehicles in practical applications. Compared with other types of batteries, lithium batteries have the advantages of high energy density, low self-discharge rate and no memory effect, and have been widely used in the field of electric vehicles. However, the prerequisite for the safe use of lithium batteries in electric vehicles is to ensure that each battery cell is always working within a safe voltage range to avoid overcharging and overheating of the battery cells. In practical applications, due to the complexity of the application environment of electric vehicles, the battery pack needs to be equipped with a corresponding energy manage...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/388G01R31/396
Inventor 刘平孟锦豪王建武
Owner 湖南栏海电气工程有限公司
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