Battery health state estimation method of electric vehicle

A battery health state, electric vehicle technology, applied in the direction of measuring electricity, measuring electric variables, measuring devices, etc., can solve the problem of low prediction accuracy of the estimation result of the battery health state, and achieve the effect of solving the unbalanced data distribution

Pending Publication Date: 2021-03-16
摩登汽车(盐城)有限公司
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Problems solved by technology

[0005] The purpose of the present invention is to solve the problem that the prediction accuracy of the estimation result of the state of health of the battery is not high in the prior art

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  • Battery health state estimation method of electric vehicle
  • Battery health state estimation method of electric vehicle
  • Battery health state estimation method of electric vehicle

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Embodiment Construction

[0040] The implementation of the present invention will be illustrated by specific specific examples below, and those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. Although the description of the present invention will be presented in conjunction with a preferred embodiment, it does not mean that the features of the invention are limited to this embodiment. On the contrary, the purpose of introducing the invention in conjunction with the embodiments is to cover other options or modifications that may be extended based on the claims of the present invention. The following description contains numerous specific details in order to provide a thorough understanding of the present invention. The invention may also be practiced without these details. Also, some specific details will be omitted from the description in order to avoid obscuring or obscuring the gist of the present invent...

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Abstract

The invention provides a battery health state estimation method for an electric vehicle. The battery health state estimation method comprises the steps of: firstly, collecting battery health state parameters of the same model through utilizing a big data platform, acquiring a database, and establishing a regression model according to the battery health state parameter data in the database; secondly, dividing output data of the regression model into outliers and normal points, dividing the outliers into capacity regeneration points and abnormal points according to a preset threshold value, substituting the capacity regeneration points and a processed abnormal point mean value into a first prediction model to generate a capacity regeneration result, performing data distribution balance processing on the normal points, and substituting the normal points into a second prediction model to generate a normal result; and finally generating a combination result, and outputting the combination result as an estimation result of the battery health state of the electric vehicle. The whole method flow can be realized by establishing a mathematical model, the influence of a capacity regenerationphenomenon is comprehensively considered, and the influence of a chemical reaction on battery capacity estimation is avoided, so that higher prediction precision is achieved.

Description

technical field [0001] The invention relates to the technical field of electric vehicle batteries, in particular to a method for estimating the state of health of batteries of electric vehicles. Background technique [0002] The battery health status describes the health of the battery compared to a new battery. The battery state of health is usually defined by the ratio of the current cycle's maximum capacity to the rated capacity. Usually, the battery failure threshold is recommended to be about 80% of the rated capacity, and after exceeding the 80% threshold, the battery capacity degradation shows an exponential decay trend. Therefore, when the battery health drops below 80%, battery performance will deteriorate rapidly. In other words, a functional failure always occurs after the battery state of health falls below the failure threshold. Once the battery state of health is less than a predetermined failure threshold, the lithium-ion battery of an electric vehicle is c...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/392
CPCG01R31/36
Inventor 刘涛赵旭孙增光
Owner 摩登汽车(盐城)有限公司
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