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Lithium battery thermal safety analysis method

An analysis method, lithium battery technology, applied in the direction of analyzing materials, measuring electricity, measuring electrical variables, etc., can solve the problems of the internal structure of the battery and the difficulty of finding hidden dangers of battery safety, and achieve the effect of accurate acquisition and accurate test results

Active Publication Date: 2020-12-18
CATARC AUTOMOTIVE TEST CENT TIANJIN CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method can only judge serious problems in the battery, such as fire, explosion, etc., and it is difficult to find out the impact on the internal structure of the battery and the potential safety hazards to the battery in a high-temperature environment.

Method used

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  • Lithium battery thermal safety analysis method
  • Lithium battery thermal safety analysis method
  • Lithium battery thermal safety analysis method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] Select the 18650 type lithium battery as the implementation object of this method, the rated capacity is 2.5Ah, and the working voltage is 2.75V-4.2V. The specific steps are:

[0053] (1) Lithium battery pretreatment: discharge the lithium battery to a cut-off voltage of 2.75V with a constant current of 2.5A;

[0054] (2) Obtain samples of the positive electrode, negative electrode and separator inside the battery, the specific method is:

[0055] (A) The battery is disassembled in an argon atmosphere glove box, and the positive electrode, negative electrode and diaphragm are taken out;

[0056] (B) using dimethyl carbonate to wash away the residual electrolyte on the surface of the positive pole, negative pole and diaphragm;

[0057] (C) Dry the positive electrode, the negative electrode, and the diaphragm in a vacuum oven, set the temperature to 60° C., and dry for 24 hours;

[0058] (D) Take 1cm×1cm (1cm 2 ) positive pole, negative pole, diaphragm as the test samp...

Embodiment 2

[0096] Select a soft-pack lithium-ion battery as the implementation object of this method, with a rated capacity of 20Ah and a working voltage of 2.0V-3.65V. The specific steps are:

[0097] (1) Lithium-ion battery pretreatment: discharge the lithium battery to a cut-off voltage of 2.0V with a constant current of 20A;

[0098] (2) Obtain samples of the positive electrode, negative electrode and separator inside the battery, the specific method is:

[0099] (A) disassemble the pretreated soft pack lithium-ion battery in an argon atmosphere glove box, and take out the positive electrode, negative electrode and diaphragm;

[0100] (B) using dimethyl carbonate to wash away the residual electrolyte on the surface of the positive pole, negative pole and diaphragm;

[0101] (C) Dry the positive electrode, the negative electrode, and the diaphragm in a vacuum oven, set the temperature to 60° C., and dry for 24 hours;

[0102] (D) Take 1cm×1cm (1cm 2 ) positive pole, negative pole, ...

Embodiment 3

[0118] Select a square hard-shell lithium-ion battery as the implementation object of this method, with a rated capacity of 22Ah and an operating voltage of 2.75V-4.2V. The specific steps are:

[0119] (1) Lithium-ion battery pretreatment, discharge the lithium battery to a cut-off voltage of 2.75V with a constant current of 22A;

[0120] (2) Obtain samples of the positive electrode, negative electrode and separator inside the battery, the specific method is:

[0121] (A) Disassemble the pretreated square hard-shell lithium-ion battery sample in an argon atmosphere glove box, and take out the positive electrode, negative electrode and separator;

[0122] (B) using dimethyl carbonate to wash away the residual electrolyte on the surface of the positive pole, negative pole and diaphragm;

[0123] (C) Dry the positive electrode, the negative electrode, and the diaphragm in a vacuum oven, set the temperature to 60° C., and dry for 24 hours;

[0124] (D) Take 2cm×2cm (4cm 2 ) pos...

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Abstract

The invention provides a lithium battery thermal safety analysis method. The temperature point at which the internal structure of a lithium ion battery is seriously degraded in the actual use processis analyzed by analyzing the thermal characteristics of the internal structure of the lithium battery so that parameter guidance is provided for use and safety protection of the lithium battery, and the improvement of the battery process level is promoted; the stability and the safety of the lithium ion battery for the electric vehicle are improved, more accurate data support is provided for process upgrading and evaluation technology development of the lithium ion battery, and a new evaluation method is provided for performance and safety evaluation of the lithium ion battery.

Description

technical field [0001] The invention belongs to the technical field of new energy, and in particular relates to a method for analyzing the thermal safety of a lithium battery. Background technique [0002] In recent years, lithium-ion batteries have not only been widely used and popularized in consumer electronics fields such as mobile phones and notebook computers due to their advantages of high energy density and long cycle life, but have been further used as power sources for new energy vehicles in pure electric vehicles and hybrid vehicles. It has been widely used as a power battery in power vehicles. The rapid development of electric transportation technology has put forward higher requirements on the performance of power batteries, and the energy density of current power batteries has gradually reached the bottleneck due to reasons such as material systems and grouping ratios. Proceeding from the principle, only by further increasing the specific capacity of the posit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/385G01R31/378G01N5/00G01N25/20
CPCG01R31/385G01R31/378G01N5/00G01N25/20Y02E60/10
Inventor 马天翼王芳魏墨晗陈立铎徐大鹏马海硕林春景刘磊
Owner CATARC AUTOMOTIVE TEST CENT TIANJIN CO LTD