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Method for obtaining electrochemical and thermal coupling models of lithium ion battery

A lithium-ion battery, a technology for obtaining a method, applied in the field of large-capacity energy storage in a smart grid

Inactive Publication Date: 2015-08-19
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The present invention aims to solve the existing problem of lacking an electrochemical and thermal coupling model for simulating changes in battery terminal voltage and case temperature over time

Method used

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  • Method for obtaining electrochemical and thermal coupling models of lithium ion battery
  • Method for obtaining electrochemical and thermal coupling models of lithium ion battery
  • Method for obtaining electrochemical and thermal coupling models of lithium ion battery

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specific Embodiment approach 1

[0037] Specific implementation mode one: refer to figure 1 Specifically illustrate the present embodiment, the acquisition method of lithium-ion battery electrochemical and thermal coupling model described in the present embodiment, it comprises the following contents:

[0038] Put the lithium-ion battery at different temperatures, input current to the lithium-ion battery, and get the terminal voltage U of the lithium-ion battery app (t):

[0039] U app ( t ) = E ocv ref ( t ) - η con - polarization ( t ) - η act - polarization ( t ...

specific Embodiment approach 2

[0046] Specific embodiment 2: This embodiment is to further explain the acquisition method of the lithium-ion battery electrochemical and thermal coupling model described in specific embodiment 1. In this embodiment, the ideal electromotive force of the battery is calculated the process of:

[0047] At a small rate of 0.02C, the discharge voltage of the lithium-ion battery is used as the ideal electromotive force of the battery, and the open-circuit potential U of the positive and negative electrodes is known. p , and U n , using the least squares method to estimate the initial lithium intercalation rate y of the positive and negative electrodes 0 and x 0 , and the change range of positive and negative poles D y and D x , according to the formula:

[0048] Q p = Q all D y , Q n = ...

specific Embodiment approach 3

[0055] Specific implementation mode three: refer to Figure 2 to Figure 5 This embodiment is described in detail. This embodiment is to further illustrate the acquisition method of the lithium-ion battery electrochemical and thermal coupling model described in the first embodiment. In this embodiment, the calculation of the reaction polarization overpotential η act-polarization and Ohmic polarization overpotential η ohm-polarization the process of:

[0056] After placing the battery at different ambient temperatures for a period of time, apply a 1kHz sinusoidal voltage excitation, and use the least squares fitting method to fit the different temperatures to obtain the ohmic internal resistance R ohm The change formula with the internal temperature of the battery:

[0057] R ohm = β 1 T 3 +β 2 T 2 +β 3 T 1 +β 4 , (Equation 5)

[0058] In the formula, β i is the parameter to be fitted, i=1, 2, 3, 4,

[0059] According to the formula:

[0060] n ohm-polarization (t...

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Abstract

The invention relates to a method for obtaining electrochemical and thermal coupling models of a lithium ion battery, and relates to the field of large-capacity energy storage of an intelligent power grid. The invention aims at solving a problem that there is short of electrochemical and thermal coupling models for the simulation of the change of a battery end voltage and housing temperature with time. According to the invention, the lithium ion battery is placed under different temperatures, and current is inputted into the lithium ion battery. The parameters of the electrochemical and thermal coupling models of the lithium ion battery are obtained according to the response curves of the battery end voltage and the housing temperature of the lithium ion battery. The coupling models can be used for the simulation of the end voltage and the housing temperature of the lithium ion battery.

Description

technical field [0001] The invention relates to electrochemical-thermal coupling mechanism modeling and a parameter acquisition method thereof, which is a multidisciplinary intersection of electrical engineering, electrochemistry, thermal science, applied mathematics, etc., and belongs to the field of large-capacity energy storage of smart grids. 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 physica...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/36G06F19/00
Inventor 王立欣吕超李俊夫罗伟林张刚
Owner HARBIN INST OF TECH
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