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A method and device for evaluating the safety of lithium-ion power batteries based on correlation dimension

A technology related to dimensionality and battery safety, which is applied in the direction of measuring devices, measuring electricity, and measuring electrical variables, etc., can solve problems such as low life, safety accidents, battery thermal runaway, etc., to reduce estimation errors, wide applicability, and application The effect of multiple occasions

Active Publication Date: 2022-06-24
HARBIN UNIV OF SCI & TECH
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Problems solved by technology

Once the battery reaches a certain critical condition, such as overvoltage, overtemperature, and low life, if the corresponding safety precautions are not taken in time, the thermal runaway of the battery will inevitably lead to a safety accident

Method used

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  • A method and device for evaluating the safety of lithium-ion power batteries based on correlation dimension
  • A method and device for evaluating the safety of lithium-ion power batteries based on correlation dimension
  • A method and device for evaluating the safety of lithium-ion power batteries based on correlation dimension

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Embodiment Construction

[0046] The embodiments of the present invention are described below through specific specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents 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 following embodiments and features in the embodiments may be combined with each other under the condition of no conflict.

[0047] During the use of the battery, the failure behavior of the battery is a gradual change process. In many cases, the battery is very close to the extreme situation of burning and explosion when the failure behavior of the battery is not obvious. When the battery burns or explodes , its des...

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Abstract

The invention discloses a method and device for estimating battery safety degree based on correlation dimension, belonging to the technical field of power battery safety evaluation. The invention aims to solve the problem that the prior art cannot quantitatively express and evaluate the safety of the power battery. The correlation dimension of the package of the present invention includes the cause sequence that causes the change of the battery safety state, and the present invention calculates the correlation dimension of the safety state change and the safety dimension of the historical normal data; then calculates the correlation dimension of the existing battery data; and takes all Comparing the correlation dimension of the cause sequence of the safety state change with the historical data correlation dimension, the safety deviation degree is used as the battery safety characteristic parameter; the battery safety membership function is constructed; the safety degree value SOS is obtained by using probability average weighting. The present invention calculates the safety value SOS of the power battery in real time through the historical data and the actual existing data of the battery, combined with the correlation dimension and the safety deviation degree model.

Description

technical field [0001] The invention relates to the field of battery safety evaluation, in particular to a method and device for evaluating the safety of lithium-ion power batteries based on correlation dimension. Background technique [0002] With the accelerating pace of commercialization of electric vehicles in the global market, the demand for high-power and high-energy power batteries has increased rapidly, and the safety of batteries has also attracted more and more attention. Especially in recent years, the news of spontaneous combustion, explosion and other accidents of lithium batteries has occurred frequently, and the safety of lithium batteries has been paid more and more attention. At present, my country's lithium battery is still in its initial stage in terms of technology research and development, and there are still many problems in terms of safety. [0003] Electric vehicles are in a new stage of rapid development in China, and the development of electric ve...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/367G01R31/392
CPCG01R31/367G01R31/392
Inventor 于乐倪劲松于德亮李然
Owner HARBIN UNIV OF SCI & TECH
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