Information fusion-based series battery pack SOC (state of charge) estimation method

A technology of connecting battery packs and battery cells in series, applied in the direction of measuring electricity, measuring electrical variables, instruments, etc., can solve the problem of lack of SOC of battery packs, achieve high-precision estimation, reduce computational complexity, improve estimation efficiency and fault tolerance effect of effect

Inactive Publication Date: 2019-08-20
CHONGQING UNIV
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Problems solved by technology

[0005] At present, the SOC estimation of the battery pack mostly adopts a scheme represented by a characteristic monomer, lacks a method that can effectively estimate the SOC of the battery pack in the full SOC range, and lacks an SOC estimation method that can cover all the monomer information in the battery pack

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  • Information fusion-based series battery pack SOC (state of charge) estimation method
  • Information fusion-based series battery pack SOC (state of charge) estimation method
  • Information fusion-based series battery pack SOC (state of charge) estimation method

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Embodiment Construction

[0043] The following describes the implementation of the present invention through specific specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the illustrations provided in the following embodiments only illustrate the basic concept of the present invention in a schematic manner. In the case of no conflict, the following embodiments and the features in the embodiments can be combined with each other.

[0044] Among them, the drawings are only used for exemplary description, and they are only schematic diagrams rather than physical drawings, and cannot be und...

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Abstract

The invention relates to an information fusion-based series battery pack SOC (state of charge) estimation method and belongs to the technical field of battery management. The method comprises the following steps that: S1, a series battery pack to be tested is selected, the technical parameters of the series battery pack to be tested are acquired, and the CMM+CDM model of the series battery pack isestablished, and model parameters required by the SOC estimation of the series battery pack are determined; S2, a trickle current charge/discharge test and an HPPC (hybrid pulse power characterization) test are carried out, so that a database of charge/discharge OCVs (open-circuit voltage) and circuit model parameters with respect to SOCs is established, and a DST (dynamic stress test) and a UDDSare simulated, and a working condition test experiment database is established; S3, an OCV-SOC relation curve is obtained, and the electrical characteristic parameters of the CDM+CDM model are obtained; and S4, the CDM+CDM model is combined with a decentralized filter, and a CMM and the SOCs of single cells are obtained on the basis of an optimal algorithm and the quantitative relation of the charge/discharge characteristic parameters with respect to the SOCs, and the SOCs of each cell are fused through weight distribution, so that the SOC of the series battery pack is realized.

Description

Technical field [0001] The invention belongs to the technical field of battery management, and relates to a method for estimating the SOC of a series battery pack based on information fusion. Background technique [0002] With the increasingly severe energy crisis and global warming, as well as the low efficiency of primary energy, the transformation of traditional automobiles has become an important industrial change in various countries. New energy vehicles have gradually become a hot area of ​​research in the global industry and academia. As one of the main energy sources and key technologies of new energy vehicles, batteries have become a key breakthrough goal for experts and scholars. Due to the limitation of battery cell power, electric vehicle power battery packs are usually composed of hundreds or thousands of single cells in series and parallel to meet the energy and power requirements of the vehicle. In order to ensure the safe, reliable and efficient operation of the...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/387G01R31/367
CPCG01R31/3648G01R31/367G01R31/387
Inventor 冯飞胡晓松车云弘刘建飞刘波李可心李云隆李佳承谢翌杨亚联
Owner CHONGQING UNIV
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