Method for obtaining electrochemical model parameters of lithium ion battery

A lithium-ion battery and model parameter technology, applied in the field of new energy research, can solve the problem of not having fast and non-destructive acquisition of parameters, and achieve good simulation estimation capabilities, improve acquisition efficiency, and efficient parameter acquisition

Inactive Publication Date: 2018-11-06
HARBIN INST OF TECH
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Problems solved by technology

[0004] The present invention is to solve the existing problem that the parameters of the mechanism model need to be obtained by means of electroche

Method used

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  • Method for obtaining electrochemical model parameters of lithium ion battery
  • Method for obtaining electrochemical model parameters of lithium ion battery
  • Method for obtaining electrochemical model parameters of lithium ion battery

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specific Embodiment approach 1

[0021] Specific implementation mode one: refer to figure 1 Specifically illustrate this embodiment, a method for obtaining electrochemical model parameters of a lithium-ion battery described in this embodiment, the method includes the following steps:

[0022] Step 1. Establish a simplified electrochemical mechanism model of lithium-ion batteries;

[0023] Step 2, apply parameter identification working conditions to the lithium-ion battery, charge and discharge the lithium-ion battery, and obtain voltage data and current data of the lithium-ion battery under charging and discharging conditions;

[0024] Step 3: Obtain the electrochemical model parameters of the lithium ion battery according to the simplified electrochemical mechanism model of the lithium ion battery and the voltage data and current data of the lithium ion battery under charging and discharging conditions.

[0025] In this embodiment, the parameter identification condition is applied to the lithium-ion batter...

specific Embodiment approach 2

[0026] Specific embodiment 2: This embodiment is a further description of the acquisition method of a lithium-ion battery electrochemical model parameter described in specific embodiment 1. In this embodiment, the simplified mechanism model of lithium-ion battery electrochemical includes the open circuit voltage E ocv (t), positive electrode active particle surface lithium intercalation concentration fraction y surf (t), the lithium intercalation concentration fraction on the surface of the negative electrode active particle x surf (t), concentration polarization overpotential η con (t), reaction polarization overpotential η act (t), ohmic polarization overpotential η ohm (t) and / or terminal voltage U app (t).

specific Embodiment approach 3

[0027] Specific implementation mode three: refer to figure 2 with Figure 4 Describe this embodiment in detail. This embodiment is a further description of the method for obtaining the electrochemical model parameters of a lithium-ion battery described in Embodiment 2. In this embodiment, it is assumed that the internal temperature and surface temperature of the battery are constant, and the open circuit Voltage E ocv The formula for (t) is:

[0028] E. ocv (t)=U p [y surf (t)]-U n [x surf (t)] Formula 1,

[0029] In the formula, U p and U n is the positive and negative open circuit potential curve, x surf (t) is the lithium intercalation concentration fraction on the surface of the negative electrode active particles, x surf (t) is expressed as: x surf (t)=x avg (t)-Δx(t) Formula 2, y surf (t) is the lithium intercalation concentration fraction on the surface of positive active particles, y surf (t) is expressed as: y surf (t)=y avg (t)+Δy(t) formula 3, the i...

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Abstract

A method for obtaining electrochemical model parameters of a lithium ion battery relates to the field of new energy research. The present invention is to solve the problems that the existing mechanismmodel parameters need to be acquired by means of an electrochemical measurement method or an intelligent algorithm, and the ability to acquire parameters quickly and without loss is not provided. Themethod comprises steps of 1, establishing an electrochemical simplification mechanism model for the lithium ion battery; 2, applying a parameter identification condition to the lithium ion battery tocharge and discharge the lithium ion battery, and obtaining voltage data and current data of the lithium ion battery under charge and discharge conditions; and 3, according to the electrochemical simplification mechanism model of the lithium ion battery and the voltage data and current data of the lithium ion battery under charge and discharge conditions, obtaining electrochemical model parameters of the lithium ion battery. The method is used to obtain electrochemical model parameters of lithium ion batteries.

Description

technical field [0001] The invention relates to a simplified mechanism model of a lithium ion battery and a parameter acquisition method thereof, in particular to an accurate and efficient model parameter acquisition method of a single lithium ion battery, belonging to the field of new energy research. Background technique [0002] The outstanding features of lithium-ion batteries are high voltage, high energy density, good cycle performance, small self-discharge, no memory effect, and environmental protection. They are the main energy storage devices for large-scale equipment or systems. The safety, reliability and economic performance of the battery restrict its further promotion and use. From the perspective of application level, the battery management system is of great significance to give full play to the performance of the battery. [0003] The lithium-ion battery mechanism model can accurately describe the complex physical and chemical processes inside the battery, ...

Claims

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Application Information

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IPC IPC(8): G01R31/36
Inventor 吕超刘恩会王立欣李俊夫
Owner HARBIN INST OF TECH
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