Information-entropy-based comprehensive evaluation method and system for battery pack inconsistency
A comprehensive evaluation and technology of battery packs, applied in the direction of measuring electricity, measuring electrical variables, instruments, etc., can solve the problems of inconsistency of battery packs that cannot be fully reflected, poor real reliability, etc., and achieve randomness and chaos, and extensive adaptive effect
Active Publication Date: 2017-10-17
SHANDONG UNIV
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[0004] In fact, the inconsistency of the battery pack is often a comprehensive reflection of the capacity and internal resistance of each battery cell, while the single-parameter evaluation method only considers one factor and cannot fully reflect the real situation of the inconsistency of the battery pack.
The multi-parameter evaluation method can reflect the inconsistency of the battery pack to a certain extent, but most of the existing evaluation methods are simple mathematical operations on the parameters, and the reliability is not good; the evaluation method of non-electrical performance can only be used as a part of the inconsistency evaluation of the battery pack. supplementary evaluation
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[0030] 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.
[0031] 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.
[0032] figure 1 It is a flow chart of the comprehensive evaluation method for battery pack inconsistency based ...
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The invention discloses an information-entropy-based comprehensive evaluation method and system for battery pack inconsistency. The method comprises: constructing an original data matrix of an evaluated battery pack based on the number of single batteries included by the battery pack and selected evaluation factors; carrying out normalization on the original data matrix to obtain normalized matrixes of all evaluation factors; according to the evaluation factors in the normalized matrixes, carrying out multiplication with natural logarithms, carrying out accumulation, carrying out multiplication with a constant coefficient expressing the number of single batteries included by the battery pack and then carrying out negation processing to obtain entropies of the corresponding evaluation factors; determining weights of the entropies of the corresponding evaluation factors to obtain weight matrixes of the normalized matrixes; carrying out multiplication of the normalized matrixes and the weight matrixes to obtain an evaluation matrix of the evaluation factors; and calculating standard differences of all elements in the evaluation matrix of the evaluation factors to obtain inconsistency quantitative evaluation data of the battery pack.
Description
technical field [0001] The invention belongs to the field of evaluation of battery packs, in particular to a comprehensive evaluation method and system for inconsistency of battery packs based on information entropy. Background technique [0002] The power battery is the core component of an electric vehicle. Generally, thousands of battery cells are connected in series and parallel to form a battery pack. However, due to many small deviations and uncertain factors in the battery manufacturing process, the battery itself has inherent inconsistencies; during use, because the battery pack is in a complex charging and discharging environment for a long time, the inconsistency between the battery cells will be further aggravated Therefore, it will greatly reduce the available capacity of the battery pack and shorten its service life. It is urgent to establish an evaluation mechanism for the inconsistency of the battery pack to provide a basis for efficient and reliable managemen...
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IPC IPC(8): G01R31/36
CPCG01R31/3648G01R31/389G01R31/396
Inventor 段彬张承慧李泽元朱瑞张奇
Owner SHANDONG UNIV
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