Electric vehicle lithium ion battery lithium precipitation diagnostic method with data drive

A technology for lithium-ion batteries and electric vehicles, which is applied in the direction of measuring electricity, measuring electrical variables, instruments, etc., can solve problems such as limited results and lithium precipitation, and achieve the effect of reducing the degree of dependence

Active Publication Date: 2019-01-04
CHONGQING UNIV
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Problems solved by technology

At present, lithium-ion batteries are generally used as power batteries for electric vehicles. However, due to their own electrode material properties and working characteristics, the battery runs at low temperatures and faces an i

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  • Electric vehicle lithium ion battery lithium precipitation diagnostic method with data drive
  • Electric vehicle lithium ion battery lithium precipitation diagnostic method with data drive
  • Electric vehicle lithium ion battery lithium precipitation diagnostic method with data drive

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Embodiment Construction

[0038] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0039] refer to figure 1 A data-driven electric vehicle lithium-ion battery analysis lithium diagnosis method provided by the present invention specifically comprises the following steps:

[0040] Step S1: Determine the type and model of the lithium-ion battery of the electric vehicle, obtain the corresponding technical parameters of the battery of this type, and establish a corresponding electrochemical model on this basis;

[0041] Step S2: In the offline stage, design a series of positive and negative solid-phase diffusion coefficient values ​​in the electrochemical model of lithium-ion batteries and perform charge and discharge simulations, construct ANN to simulate the response relationship between input and output of lithium-ion batteries under different working conditions, and use The Kriging model establishes the mapping relationsh...

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Abstract

The present invention relates to an electric vehicle lithium ion battery lithium precipitation diagnostic method with data drive, belonging to the technical field of battery management. The method comprises the steps of: S1: establishing an electrochemical model of a lithium ion battery; S2: in an offline phase, constructing ANN to simulate a response relation of input and output of the lithium ion battery in different conditions, and employing a Kriging model to establish a mapping relation between the ANN weight and a solid phase diffusion coefficient; S3: in an online phase, measuring datain the battery charging process through an experiment, and predicting the actual solid phase diffusion coefficients of positive and negative poles of the battery; and S4: substituting the solid phasediffusion coefficients into a solid phase diffusion equation to calculate and obtain the solid phase lithium ion concentrations of the positive and negative poles in the charging process, establish the criterion of the lithium precipitation based on the concentrations and determine whether a lithium precipitation phenomenon is generated or not in the charging process through adoption of the calculated and obtained concentrations of the positive and negative poles. In a condition of ensuring the integration of the lithium ion battery, the dependence degree of the lithium precipitation phenomenon detection process on the mechanism model is reduced.

Description

technical field [0001] The invention belongs to the technical field of battery management, and relates to a data-driven diagnosis method for lithium analysis of lithium-ion batteries of electric vehicles. Background technique [0002] In the 21st century, human's demand for energy is increasing day by day, but the reduction of traditional energy and a series of environmental problems caused by the use of traditional energy force countries to adjust and optimize their energy structure. This phenomenon is most obvious in the automotive industry. Traditional fuel vehicles have the characteristics of low energy utilization and exhaust emissions that pollute the environment. Electric vehicles have perfectly overcome these two defects of traditional fuel vehicles. Therefore, in recent years, electric vehicles The proportion of the market has gradually increased, and related research has become a hot spot in domestic and foreign academic and industrial circles. As one of the core ...

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Application Information

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IPC IPC(8): G01R31/36
Inventor 胡晓松冯飞郑宇生谢翌唐小林杨亚联
Owner CHONGQING UNIV
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