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A method for estimating the peak power of a power battery pack

A power battery pack and power battery technology, which is applied in the direction of measuring electricity, measuring electrical variables, instruments, etc., can solve problems such as difficult to obtain estimated results, high estimated results, overcharge or overdischarge of power battery cells, and achieve reduction The effect of storage space occupancy, accuracy assurance, and accuracy improvement

Active Publication Date: 2021-04-02
SHANDONG UNIV
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Problems solved by technology

[0003] The traditional peak power estimation method generally takes the power battery pack as a whole, and lacks consideration of the inconsistency between the power battery cells inside the power battery pack, resulting in too high or too low estimation results and large errors
In fact, in the process of charging and discharging, it is necessary to fully consider the limiting conditions such as the voltage of the power battery cell, the state of charge SoC and the current. body overcharge or overdischarge, and even cause safety problems

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  • A method for estimating the peak power of a power battery pack
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  • A method for estimating the peak power of a power battery pack

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[0052]It should be pointed out that the following detailed description is exemplary and intended to provide further explanation to the present application. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.

[0053] It should be noted that the terminology used here is only for describing specific implementations, and is not intended to limit the exemplary implementations according to the present application. As used herein, unless the context clearly dictates otherwise, the singular is intended to include the plural, and it should also be understood that when the terms "comprising" and / or "comprising" are used in this specification, they mean There are features, steps, operations, means, components and / or combinations thereof.

[0054] The invention discloses a method for estimating the peak power of a power battery pack. Considering the in...

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Abstract

The invention discloses a peak value power estimation method for a power battery pack, solving the problem of not considering inconsistency between battery cells in the power battery pack, and havingthe advantages of significantly improving accuracy for estimating the peak value power of the power battery pack. The peak value power estimation method for a power battery pack includes the steps: updating a first-order RC equivalent circuit model parameter of a power battery in real time by means of an online identification method; estimating a power battery state of charge SoC on line, based ona state space expression of the first-order RC equivalent circuit model of the power battery; considering the state of charge SoC, and limitation of voltage, current and power of the power battery cells, calculating the peak value power of the power battery cells; and calculating the peak value power of the power battery pack according to the obtained peak value power of the power battery cells,wherein the peak value charge power is decided by the power battery cell with the highest voltage and the peak value discharge power is determined by the power battery cell with the lowest voltage.

Description

technical field [0001] The invention relates to the technical field of power batteries, in particular to a method for estimating peak power of a power battery pack. Background technique [0002] In order to ensure the safe and efficient operation of electric vehicles, the on-board power battery management system needs to accurately estimate the state of charge, peak power and health status of the power battery pack. Among them, the peak power represents the instantaneous acceleration capability and energy feedback capability of the electric vehicle. If the peak power is estimated too high, it will cause the power battery pack to be overcharged or over-discharged, resulting in a rapid decline in the life of the power battery pack; on the contrary, if the peak power estimate If it is too low, the driving performance of the vehicle will be reduced, thereby affecting the driver's stable operation of the vehicle, and even causing safety accidents. Therefore, the accurate estimat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/3842G01R31/388G01R31/392
Inventor 张承慧周忠凯段彬崔纳新商云龙
Owner SHANDONG UNIV
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