A Lithium-ion Battery Life Prediction Method Based on Capacity Fading Mechanism Decomposition Analysis

A lithium-ion battery, capacity decay technology, applied in the direction of measuring electricity, measuring electrical variables, measuring devices, etc., can solve the problem of disjointed attenuation mechanism, achieve the effect of reducing test samples and improving the accuracy of life prediction

Active Publication Date: 2019-07-09
SHANGHAI POWER ENERGY STORAGE BATTERY SYST ENG TECH +1
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Problems solved by technology

[0005] The purpose of the present invention is to solve the problem of being out of touch with the attenuation mechanism in the process of predicting the remaining capacity of lithium-ion batteries, and to establish a method that can accurately predict the remaining capacity of lithium-ion batteries.

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  • A Lithium-ion Battery Life Prediction Method Based on Capacity Fading Mechanism Decomposition Analysis
  • A Lithium-ion Battery Life Prediction Method Based on Capacity Fading Mechanism Decomposition Analysis
  • A Lithium-ion Battery Life Prediction Method Based on Capacity Fading Mechanism Decomposition Analysis

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Embodiment Construction

[0026] The present invention will be further described below with reference to the accompanying drawings through specific embodiments, which are only used to illustrate the present invention, but not to limit the protection scope of the present invention.

[0027] The lithium ion battery life prediction method based on the decomposition analysis of the capacity decay mechanism of the present invention decomposes the capacity decay of the lithium ion battery into 3 decay modes based on different chemical and physical mechanisms, and conducts different decay modes according to its chemical or physical mechanism. Regular extrapolation, the capacity decay of lithium-ion batteries is the result of the combined action of the three modes. like figure 1 As shown, the implementation steps of this prediction are as follows:

[0028] Step 1 (S1), based on the working principle of the lithium ion battery (that is, the basic electrochemical model of the lithium ion battery, which is a bas...

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Abstract

The invention discloses a method for forecasting service life of a lithium ion battery based on capacity attenuation mechanism decomposition analysis. The method comprises the following steps: step one, establishing an equilibrium potential equation of a lithium ion battery to be tested by subtracting equilibrium potentials of positive and negative electrodes with combination of test data of the lithium ion battery to be tested, and then carrying out polarization modification to obtain the equilibrium potential equation; step two, establishing a multi-attenuation-mode decomposition model based on different attenuation mechanisms of the lithium ion battery, establishing a multi-attenuation-mode fitting equation of the lithium ion battery to be tested through a short-term aging test and forecasting attenuation trend; and step three, substituting a forecasting result of the multi-attenuation-mode fitting equation into the equilibrium potential equation of the lithium ion battery to be tested, and forecasting residual capacity. Through the service life forecasting method for carrying out decomposition analysis of different attenuation modes based on different capacity attenuations of the lithium ion battery, the problem that simple extrapolation is carried out according to the experiment test data or the attenuation of the service life of the lithium ion battery is simply ascribed to the single electrochemical mechanism is solved.

Description

technical field [0001] The invention belongs to the field of lithium ion battery life prediction, and relates to a lithium ion battery life prediction method based on capacity decay mechanism decomposition analysis. Background technique [0002] Lithium-ion batteries have the advantages of high operating voltage, high energy density, long cycle life, and low self-discharge. They have been widely used in portable electronic equipment, electric vehicles, new energy power generation and storage, and space fields. [0003] Compared with other types of secondary batteries, lithium-ion batteries have better life characteristics, better storage performance at room temperature and cycle performance. The storage life of lithium-ion batteries at room temperature can reach 6 to 8 years, and the long storage life of lithium-ion batteries developed for long-term storage life characteristics can even reach 10 to 15 years. The requirement is not less than 5 years and 10 years respectively...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/36
CPCG01R31/367
Inventor 晏莉琴吕桃林罗英张熠霄罗伟林解晶莹
Owner SHANGHAI POWER ENERGY STORAGE BATTERY SYST ENG TECH
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