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A method for predicting cycle life of lithium-ion batteries

A lithium-ion battery, cycle life technology, applied in the direction of measuring electricity, measuring devices, measuring electrical variables, etc., can solve the problem that the model does not have universality

Active Publication Date: 2019-01-22
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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Problems solved by technology

In addition, the model is not universal

Method used

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  • A method for predicting cycle life of lithium-ion batteries
  • A method for predicting cycle life of lithium-ion batteries
  • A method for predicting cycle life of lithium-ion batteries

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Embodiment Construction

[0039] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0040] Such as figure 1 Shown, a kind of cycle life prediction method of lithium-ion battery, comprises the following steps:

[0041] S1. Establish a capacity fading model, as shown in formula (1):

[0042]

[0043] In formula (1), Q loss Indicates capacity loss rate, T indicates cycle temperature, t indicates cycle days, T 0 Indicates the cycle reference temperature, z is a constant, N represents the number of cycles per day, and has the following relationship with the charge and discharge rate:

[0044]

[0045] H represents the charge and discharge rate, k is the empirical value, α, β, β T are the model parameters to be solved.

[0046] S2. Determine the value of each model parameter in the capacity fading model:

[0047] S21. Determine the experimental conditions: determine the cycle temperature range according to the normal cha...

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Abstract

The invention provides a cycle life prediction method of a lithium ion battery. The method comprises the following steps that a capacity attenuation model is established; an experiment condition is determined; an experiment is carried out; values of model parameters are determined preliminarily; fine tuning is carried out on the values of the model parameters; the vales of the model parameters are determined; and a cycle life is predicted. According to the method, the provided capacity attenuation model takes influence of the cycle temperature and charging / discharging multiplying power into consideration and is universal to certain extent; meanings of the parameters in the capacity attenuation model are clear, and influential degrees of the parameters on capacity attenuation are easy to obtain from the capacity attenuation model; and the capacity attenuation model can be used to predict the cycle life of the same type of battery in certain cycle temperature and charging / discharging multiplying power, and technical and theoretical basis is provided for replacement of the battery when the battery reaches the life termination.

Description

technical field [0001] The invention relates to the technical field of lithium-ion battery life prediction, in particular to a method for predicting the cycle life of a lithium-ion battery. Background technique [0002] Under the urgent needs of economic globalization and social energy conservation and emission reduction, the focus of the development of the world's automobile industry is shifting. At present, the development of new energy vehicles with the characteristics of environmental protection and energy saving has become a consensus in the automotive field, and electric vehicles are just a common technology in this direction of development. An electric vehicle is a vehicle powered by a power battery. As an important part of an electric vehicle, the performance of the power battery will directly affect the development and application prospects of the electric vehicle. [0003] The life of the power battery is one of the important performance indicators of the power ba...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/385G01R31/367G01R31/392
CPCG01R31/367G01R31/385G01R31/392
Inventor 吴风霞杨思文王世旭
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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