Lithium battery pack consistency detection method and device based on local outlier factor

An outlier factor, lithium battery pack technology, applied in measurement devices, measurement of electricity, measurement of electrical variables, etc., can solve problems such as low accuracy, difficult judgment, and poor model fit.

Pending Publication Date: 2021-06-29
武汉云衡智能科技有限公司
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  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to reduce the problems of poor model fitting, low accuracy, and difficult judgment in the existing battery pack consistency detection method, a lithium battery pack consistency detection method based on local outlier factors is provided in the first aspect of the present invention , comprising the steps of: obtaining the voltage curves of a plurality of cells in the battery pack; calculating the distance between the voltage curve of each cell and the voltage curves of other cells by using the Euclidean distance, and obtaining a plurality of voltage curves corresponding to each cell Cell distance; Calculate the local outlier factor score of each battery cell in the battery pack according to the multiple cell distances corresponding to each battery cell; Cores with inconsistent cores

Method used

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  • Lithium battery pack consistency detection method and device based on local outlier factor
  • Lithium battery pack consistency detection method and device based on local outlier factor
  • Lithium battery pack consistency detection method and device based on local outlier factor

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Embodiment 1

[0033] refer to figure 1 , in the first aspect of the present invention, a lithium battery pack consistency detection method based on local outlier factors is provided, comprising the following steps: S101. Acquiring the voltage curves of a plurality of batteries in the battery pack; S102. Using the Euclidean distance Calculate the distance between the voltage curve of each cell and the voltage curves of other cells to obtain the distances of multiple cells corresponding to each cell; S103. Calculate the battery pack according to the distances of multiple cells corresponding to each cell The local outlier factor (Local Outlier Factor, LOF) score of each cell in the battery; S104. Based on the local outlier factor score of each cell, determine the cells in the battery pack that are inconsistent with other cells.

[0034] In step S102 in some embodiments of the present invention, the Euclidean distance is used to calculate the distance between the voltage curve of each cell and ...

Embodiment 2

[0055] refer to Image 6 , the second aspect of the present invention provides a lithium battery pack consistency detection device 1 based on local outlier factors, including an acquisition module 11, a first calculation module 12, a second calculation module 13, and a determination module 14, the The obtaining module 11 is used to obtain the voltage curves of multiple cells in the battery pack; the first calculation module 12 is used to calculate the distance between the voltage curve of each cell and the voltage curves of other cells by using the Euclidean distance , to obtain a plurality of battery cell distances corresponding to each battery cell; the second calculation module 13 is used to calculate the local outlier factor of each battery cell in the battery pack according to the multiple battery cell distances corresponding to each battery cell Scoring; the determination module 14 is configured to determine the cells in the battery pack that are inconsistent with other ...

Embodiment 3

[0058] A third aspect of the present invention provides an electronic device, including: one or more processors; a storage device for storing one or more programs, when the one or more programs are used by the one or more The processor executes, so that the one or more processors implement the method provided by the first aspect of the present invention.

[0059] refer to Figure 7 , the electronic device 500 may include a processing device (such as a central processing unit, a graphics processing unit, etc.) 501, which may be loaded into a random access memory (RAM) 503 according to a program stored in a read-only memory (ROM) 502 or loaded from a storage device 508 Various appropriate actions and processing are performed by the programs in the program. In the RAM 503, various programs and data necessary for the operation of the electronic device 500 are also stored. The processing device 501 , ROM 502 and RAM 503 are connected to each other through a bus 504 . An input / ou...

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Abstract

The invention relates to a lithium battery pack consistency detection method and device based on a local outlier factor. The method comprises the following steps: acquiring voltage curves of a plurality of battery cells in a battery pack; calculating the distance between the voltage curve of each battery cell and the voltage curves of other battery cells by using the Euclidean distance to obtain a plurality of battery cell distances corresponding to each battery cell; calculating a local outlier factor score of each battery cell in the battery pack according to the plurality of battery cell distances corresponding to each battery cell; and based on the local outlier factor score of each battery cell, determining the battery cells inconsistent with other battery cells in the battery pack. According to the invention, the outlier cells of a lithium battery pack are detected by using local outlier factors, noise data can be effectively filtered, and the accuracy and effectiveness of abnormal cell detection are improved.

Description

technical field [0001] The invention belongs to the technical field of detection of lithium battery packs, and in particular relates to a consistency detection method and device for lithium battery packs based on local outlier factors. Background technique [0002] Due to the limitation of the technology level, the individual cells in the current battery module cannot be completely consistent. The consistency of the battery mainly refers to the convergence of the main parameters such as capacity, voltage, internal resistance, and self-discharge rate. The batteries have inconsistencies in the early stage of forming a group. In the process of use, due to the influence of factors such as the combination structure of the battery pack, operating conditions, use environment, and battery management, the inconsistency of the batteries will become more and more obvious until it affects the battery module. normal use of the group. Therefore, the battery management system should have ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/367G01R31/396
CPCG01R31/367G01R31/396
Inventor 张地强祝成都
Owner 武汉云衡智能科技有限公司
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