Prediction method of remaining useful life based on lithium battery degradation stage division

Abstract

The invention discloses a prediction method of remaining useful life (RUL) based on lithium battery degradation stage division. The prediction method comprises the steps that according to the relationbetween health indexes and battery capacity values in a training set, a capacity prediction model is established; capacity values in a test set are predicted; the capacity values in the training setand the capacity values in the test set are divided into three stages, and a classification model is established; an RUL prediction model is established according to the health indexes and the corresponding RUL at the third stage; health indexes of a to-be-predicted RUL sample are collected, and a predicted capacity value is acquired; the predicted capacity value is input into the classification model to obtain a sample category; and if the sample is at the third stage, the health indexes of the sample are input into the RUL prediction model to obtain a predicted value of the RUL. Through theprediction method, the battery RUL at the third stage is accurately predicted according to the classification model and the RUL prediction model, and only the battery RUL at the third stage is predicted, so that the calculation amount is small.

Description

technical field [0001] The invention belongs to the field of prediction of the remaining service life of lithium batteries, and more specifically relates to a method for predicting the remaining service life of lithium batteries based on the division of degradation stages. Background technique [0002] Due to its high energy density, low self-discharge rate, wide operating temperature range, fast charging and discharging speed and many other advantages, lithium batteries have been widely used in transportation power supplies, electric energy storage power supplies, mobile communications Power and other fields. However, during the recycling process of lithium batteries, due to the internal physical structure of the battery, external environmental conditions and improper use, etc., its performance will be degraded. For example, the capacity value will decrease with the increase of the number of cycles. Therefore, It is of great significance to establish a battery degradation ...

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Problems solved by technology

[0006] In view of the defects of the prior art, the purpose of the present invention is to provide a method for predicting the remaining service life based on the division of the degradation stages of lithium batteries, aiming to solve the problem of low prediction accuracy due to the fact that the existing remaining life prediction of lithium batteries does not carry out the division of degradation stages The problem

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