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Power lithium battery data screening method based on open-circuit voltage

A technology of open circuit voltage and lithium battery, which is applied in the direction of measuring electricity, measuring electrical variables, instruments, etc., to achieve the effect of simple, convenient and fast classification of the working process

Pending Publication Date: 2022-05-13
NANJING ELECTRIC POWER ENG DESIGN +2
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Problems solved by technology

[0003] The purpose of the present invention is to provide a power lithium battery data screening method based on open circuit voltage to solve the problem of how to screen battery data in different aging states in the cloud platform

Method used

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  • Power lithium battery data screening method based on open-circuit voltage
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  • Power lithium battery data screening method based on open-circuit voltage

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Embodiment 1

[0030] Using the method introduced in the specific implementation manner, the screening and classification of the aging state is performed on the battery open circuit voltage fragment data set obtained in the experiment. In this embodiment, the data acquisition object is a 18650-type lithium iron phosphate battery, and the common voltage working range is selected as 3.2 to 3.3V; the characteristic curve is divided into 5 parts in the voltage working range, and the capacity span between the dividing points is Classification algorithm features, respectively counted as x 1 , x 2 ,...,x 5 . Such as figure 2 As shown, the open circuit voltage segments in the data set are adaptively divided into six categories, and the state of health (SOH) span of each category of data is accurately controlled within a small range, which shows the rationality of the feature selection method and screening method effectiveness. Therefore, by using the open circuit voltage fragments collected wh...

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Abstract

The invention discloses a power lithium battery data screening method based on open-circuit voltage, relates to the technical field of battery management, and is used for solving the problem of how to screen cloud power lithium battery data. And extracting features of open-circuit voltage fragments formed by the data points as input of a classification algorithm, and performing aging state self-adaptive screening on a large amount of lithium battery data in the cloud. The method is simple and convenient in working process, and can quickly and accurately realize quick classification of the aging degree of the battery data.

Description

technical field [0001] The invention belongs to the technical field of battery management, and in particular relates to a power lithium battery data screening method based on open circuit voltage. Background technique [0002] With the popularization of electric vehicles, a large amount of battery data is collected in the cloud, and some data-driven battery management technologies have emerged, such as open-circuit voltage curve reconstruction. However, the inevitable aging of power lithium batteries makes it difficult for these technologies to directly use full-life battery data for effective battery management. Therefore, how to screen power lithium battery data and reduce the distribution interval span of data aging state as much as possible is of great significance in this field. Contents of the invention [0003] The purpose of the present invention is to provide a power lithium battery data screening method based on the open circuit voltage to solve the problem of h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/388G01R31/392G01R31/396G01R31/36
CPCG01R31/388G01R31/392G01R31/396G01R31/3648
Inventor 吴静云黄峥戚文鄢博王俊陈俊杰刘浩孙金磊
Owner NANJING ELECTRIC POWER ENG DESIGN
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