Lithium ion battery state of health linear evaluation method

A lithium-ion battery, state of health technology, applied in the direction of measuring electricity, measuring electrical variables, measuring devices, etc., can solve the problems of complex modeling process, low robustness, and low computing efficiency, and achieve high estimation accuracy and method simple and effective effect

Active Publication Date: 2019-05-31
BEIJING INSTITUTE OF TECHNOLOGYGY
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Problems solved by technology

[0003] In order to solve the problems existing in the prior art, the present invention provides a linear evaluation method for the state of health of lithium-ion batteries, which solves the problems of low robustness, complicated modeling process, low computing efficiency and low accuracy in previous methods

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  • Lithium ion battery state of health linear evaluation method
  • Lithium ion battery state of health linear evaluation method
  • Lithium ion battery state of health linear evaluation method

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Embodiment Construction

[0048] The specific embodiments of the present invention are described below so that those skilled in the art can understand the present invention, but it should be clear that the present invention is not limited to the scope of the specific embodiments. For those of ordinary skill in the art, as long as various changes Within the spirit and scope of the present invention defined and determined by the appended claims, these changes are obvious, and all inventions and creations using the concept of the present invention are included in the protection list.

[0049] like figure 1 Shown, a kind of lithium-ion battery state of health linear assessment method, the method comprises the following steps:

[0050] Step S1: During n times of constant current and constant voltage charging of single or multiple batteries, extract m health factor indicators to form an m*n dimensional original data matrix:

[0051]

[0052] And record the row vector of matrix A as the health factor a i...

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Abstract

The invention discloses a lithium ion battery state of health linear evaluation method. The method includes the following steps that: step S1, m health factor indicators are extracted in n times of the constant-current constant-voltage charging process of a single battery or a plurality of batteries, so that a m*n-dimension original data matrix A is formed; step S2, each row of vectors of the matrix A is normalized, so that various types of normalized health factor vectors are obtained; step S3, an ampere-hour integral method is adopted to solve available battery capacity during the n times ofthe constant-current constant-voltage charging process; step S4, standardization processing is performed on the available battery capacity Qchg, i during the n times of the constant-current constant-voltage charging process, so that a vector q is obtained; and step S5, the Pearson's correlation coefficients pq,xi of the various types of normalized health factor vectors xi and the vector q are calculated. With the method adopted, the problems of low robustness, complicated modeling process, low computational efficiency and low accuracy of methods in the prior art can be solved.

Description

technical field [0001] The invention relates to the field of positioning lithium battery health status evaluation, in particular to a linear evaluation method for lithium ion battery health status. Background technique [0002] With the widespread application of lithium-ion batteries in various systems in the fields of electric vehicles, aerospace, and communications, accurate estimation of their health status is particularly important for system reliability and safety. The available capacity of lithium-ion batteries is usually used as a direct degradation parameter to evaluate the health status of the battery, but limited by the accuracy of traditional current sensors, it is difficult to directly measure the available capacity of the battery in actual complex working conditions. At present, estimation methods for battery capacity include model-based methods and data-driven methods. The latter uses parameters such as current, voltage, and time intervals during battery operat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/392G01R31/367
Inventor 程夕明韩孟佐
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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