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Lithium ion battery life prediction method

A lithium-ion battery, life prediction technology, applied in the direction of measuring electricity, measuring devices, measuring electrical variables, etc., can solve problems such as the inability to effectively predict battery life, and achieve the effect of improving the accuracy of prediction

Pending Publication Date: 2020-07-17
ZHENGZHOU YUTONG BUS CO LTD
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Problems solved by technology

[0003] The purpose of the present invention is to provide a method for predicting the life of a lithium-ion battery, which is used to solve the problem that the actual service life of the battery cannot be effectively predicted in the prior art

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Embodiment Construction

[0022] The specific embodiments of the present invention will be further described below in conjunction with the accompanying drawings.

[0023] A life prediction method for lithium-ion batteries proposed in this embodiment, determines the first capacity fading model through storage experiments, substitutes the determined first capacity fading model into the second capacity fading model, and determines the second capacity through charge-discharge cycle experiments For the unknown parameters of the attenuation model, the battery life is predicted through the second capacity attenuation model finally obtained, and the prediction is the battery life under the comprehensive consideration of the storage life and cycle life, which is closer to the actual service life of the battery.

[0024] Before carrying out the storage experiment and the charge-discharge cycle experiment, the conditions for the storage experiment and the charge-discharge cycle experiment are determined as follows...

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Abstract

The invention relates to a lithium ion battery life prediction method, and belongs to the technical field of battery life evaluation. The method includes firstly, building a first capacity attenuationmodel representing the storage life of a battery; solving unknown parameters of the first capacity attenuation model according to the storage experiment data of the storage experiment; then, according to the determined first capacity attenuation model, establishing a second capacity attenuation model in combination with the number of charge-discharge cycles of the battery within the set time, andsolving unknown parameters of the second capacity attenuation model according to cycle experiment data of a charge-discharge cycle experiment, thereby finally determining the second capacity attenuation model representing the storage life and the cycle life of the battery; and finally, substituting the working condition information of the actual use of the battery into the second capacity attenuation model so as to obtain the predicted life of the battery. Compared with a method for purely predicting the storage life or the cycle life in the prior art, the method is more suitable for the actual service condition of the battery and can quickly predict the actual life of the battery.

Description

technical field [0001] The invention belongs to the technical field of battery life evaluation, and in particular relates to a life prediction method of a lithium ion battery. Background technique [0002] At present, there are many technical solutions for battery life prediction, but most of them only consider individual or several related factors to predict storage life or cycle life. For example, the Chinese patent application with publication number CN107144790A discloses a lithium-ion The method of battery cycle life, the method only predicts the life of the battery under a characteristic cycle test condition; the Chinese patent application with publication number CN106443497A discloses a storage life prediction method for lithium-ion batteries, the method only predicts the storage life Make predictions. However, the single storage life prediction method or cycle life prediction method considers relatively one-sided relevant factors, resulting in that the battery life ...

Claims

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Application Information

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IPC IPC(8): G01R31/367G01R31/392G01R31/387
Inventor 史亚林武剑锋纪柯
Owner ZHENGZHOU YUTONG BUS CO LTD
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