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Method and system for simulating thermal runaway of lithium ion battery

A technology of lithium-ion batteries and simulation methods, applied in the field of thermal runaway simulation methods and systems of lithium-ion batteries, can solve problems such as difficult to characterize the internal temperature of lithium-ion batteries, changes in battery composition materials, complex experimental devices, etc., and reduce experimental work , saving time and cost

Inactive Publication Date: 2020-07-31
CHINA ELECTRONIC TECH GRP CORP NO 18 RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These experimental methods are destructive experimental methods and require a lot of lithium-ion battery preparation work
In addition, in order to accurately and in situ measure the battery parameters during thermal runaway, the experimental setup is complicated
In addition, experimental methods are difficult to characterize the internal temperature of lithium-ion batteries and the changes in the components and materials of batteries.

Method used

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  • Method and system for simulating thermal runaway of lithium ion battery
  • Method and system for simulating thermal runaway of lithium ion battery
  • Method and system for simulating thermal runaway of lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0080] LiNi 1 / 3 Co 1 / 3 Mn 1 / 3 O 2 / Graphite lithium ion battery thermal runaway simulation

[0081] Step 1: Put LiNi 1 / 3 Co 1 / 3 Mn 1 / 3 O 2 (NCM111) The positive electrode is charged to 4.3V (vs. Li + / Li). DSC tests were carried out at heating rates of 2.5, 3.5 and 5°C / min. The results are shown in figure 1 .

[0082] Step 2: Discharge the graphite negative electrode to 0V (vs.Li + / Li), DSC tests were carried out at heating rates of 5, 10 and 15℃ / min, and the results are shown in Figure 5 .

[0083] Step 3: The electrolyte is 1mol / L LiPF 6 The solution of EC+DEC+EMC (volume ratio 1:1:1) was tested by DSC at heating rates of 5, 10 and 20℃ / min. The results are shown in Image 6 .

[0084] Step 4: Perform integral calculation and kinetic fitting on the DSC curves of the three materials at different heating rates to obtain the reaction heat and kinetic parameters of the thermal reaction of the materials.

[0085] Step 5: Use COMSOL Multiphysics software to build LiNi 1 / 3 Co 1 / 3 Mn 1 / 3 O 2...

Embodiment 2

[0089] LiNi 0.5 Co 0.2 Mn 0.3 O 2 / Graphite lithium ion battery thermal runaway simulation

[0090] Step 1: Put LiNi 0.5 Co 0.2 Mn 0.3 O 2 (NCM523) Positive charge to 4.3V (vs. Li + / Li). DSC tests were carried out at heating rates of 2.5, 5 and 10℃ / min, and the results are shown in figure 2 .

[0091] Steps 2 to 7 are the same as in Example 1. The negative electrode material and electrolyte used in NCM523 / graphite battery are the same as those in Example 1. The battery temperature and temperature change rate of NCM523 / graphite lithium ion battery thermal runaway simulation output change with time See the curve Figure 8 , The battery temperature change rate and the material reaction rate change curve with the battery temperature, see Picture 12 .

Embodiment 3

[0093] LiNi 0.6 Co 0.2 Mn 0.2 O 2 / Graphite lithium ion battery thermal runaway simulation

[0094] Step 1: Put LiNi 0.6 Co 0.2 Mn 0.2 O 2 (NCM622) Positive charge to 4.3V (vs. Li + / Li). DSC tests were carried out at heating rates of 2.5, 5 and 10℃ / min, and the results are shown in image 3 .

[0095] Steps 2 to 7 are the same as in Example 1. The negative electrode material and electrolyte used in NCM622 / graphite battery are the same as in Example 1. The battery temperature and temperature change rate of NCM622 / graphite lithium ion battery thermal runaway simulation output change with time See the curve Picture 9 , The battery temperature change rate and the material reaction rate change curve with the battery temperature, see Figure 13 .

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Abstract

The invention relates to a method and a system for simulating thermal runaway of a lithium ion battery, which belong to the technical field of lithium ion batteries and are characterized by comprisingthe following steps of: 1, testing thermal properties of a cathode material, an anode material and an electrolyte of the lithium ion battery by a differential scanning calorimetry; 2, calculating thepeak area of each heat absorption / release peak in the DSC curve obtained by the DSC test, and taking the average value of the peak areas of the DSC curve tested by the same material at different heating rates; 3, carrying out chemical reaction kinetic fitting on the DSC curves tested at different heating rates; 4, establishing the thermal model of the lithium ion battery by using COMSOL Multiphysics; 5, setting initial conditions and boundary conditions, dividing grids, and calculating, solving and simulating the thermal runaway process of the lithium ion battery; and 6, outputting a simulation result to obtain the temperature change condition of the lithium ion battery in the thermal runaway process and the reaction condition of the battery composition material.

Description

Technical field [0001] The invention belongs to the technical field of lithium ion batteries, and specifically relates to a method and system for simulating thermal runaway of lithium ion batteries. Background technique [0002] With the widespread application of lithium-ion batteries in the field of electric vehicles, their safety issues have received great attention. Thermal runaway refers to the rapid increase in battery temperature caused by the chain reaction of battery heat, which may lead to combustion and explosion accidents, which is a major safety hazard of lithium-ion batteries. Research on the process and mechanism of thermal runaway of lithium-ion batteries is helpful to improve the safety design of lithium-ion batteries and reduce the risk of thermal runaway of lithium-ion batteries. [0003] The traditional experimental methods mainly study the thermal runaway properties of lithium-ion batteries by preparing lithium-ion batteries, conducting thermal runaway experime...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F30/20H01M10/0525G06F119/08
CPCH01M10/0525Y02E60/10
Inventor 宁凡雨王松蕊刘胜男丁飞刘兴江
Owner CHINA ELECTRONIC TECH GRP CORP NO 18 RES INST
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