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Battery health state estimation method for general discharge working condition

A technology for battery health status and working conditions, which is used in testing electrical devices during transportation, measuring electricity, measuring electrical variables, etc., and can solve problems such as capacity cannot be measured online.

Active Publication Date: 2020-11-20
CHONGQING UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Generally, the internal resistance can be directly measured through the pulse charge and discharge process, while the capacity cannot be measured online

Method used

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  • Battery health state estimation method for general discharge working condition
  • Battery health state estimation method for general discharge working condition
  • Battery health state estimation method for general discharge working condition

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Embodiment Construction

[0054]Embodiments of the present invention are described below through 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 implementation modes, and various modifications or changes can be made to the details in this specification based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the diagrams provided in the following embodiments are only schematically illustrating the basic concept of the present invention, and the following embodiments and the features in the embodiments can be combined with each other in the case of no conflict.

[0055] Wherein, the accompanying drawings are for illustrative purposes only, and represent only schematic diagrams, rather than physical drawings, and should ...

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Abstract

The invention relates to a battery state of health (SOH) estimation method for a general discharge working condition, which belongs to the technical field of batteries, and comprises the following steps: S1, directly performing voltage segmentation on a constant current or pulse working condition to obtain an electric quantity difference sequence; for a dynamic current working condition, carryingout voltage filtering firstly, then carrying out voltage segmentation, and obtaining an electric quantity difference sequence; S2, extracting health factors: calculating standard deviations of the electric quantity sequence and the electric quantity difference sequence as the health factors, and respectively representing the health factors as stdQ _ VP and stdQ _ VP; S3, analyzing the linear correlation between the health factor and the battery capacity by adopting a Pearson correlation coefficient; and S4, estimating the SOH of the battery by using a data driving method. According to the method, a simple linear regression model can be established to estimate the SOH of the battery under a universal discharge working condition.

Description

technical field [0001] The invention belongs to the technical field of batteries, and relates to a method for estimating the state of health of a battery for general discharge conditions. Background technique [0002] The electrification of vehicles is a major strategic requirement for energy reform and the development of smart, environmentally friendly and energy-saving travel methods in various countries around the world. As one of the important components, the energy storage system has long restricted the development of electric vehicles, electric ships and electric aircraft. Lithium-ion batteries have the characteristics of high energy, high power and long life, and are regarded as the best choice for energy storage systems. However, as an electrochemical system, the performance of the battery will be degraded to varying degrees during use or idle process, and its power capability and safety will be reduced in the process. In order to reduce battery usage costs and pre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/392G01R31/367G01R31/36G01R31/00
CPCG01R31/392G01R31/367G01R31/3648G01R31/005Y02E60/10
Inventor 胡晓松邓忠伟王鹏唐小林李佳承谢翌
Owner CHONGQING UNIV
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