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Safety detection method of ternary lithium ion battery

A lithium-ion battery and detection method technology, applied in the direction of measuring electricity, measuring devices, measuring electrical variables, etc., can solve problems such as complex operation process, battery safety hazards, battery metal filings, etc., and achieve simple equipment, good applicability, and easy operation simple effect

Inactive Publication Date: 2020-09-01
TIANJIN UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The main material of ternary lithium-ion batteries on the market is generally nickel-cobalt lithium manganese oxide as the positive electrode, and graphite as the negative electrode. During the production process of the battery, due to various factors such as insufficient processing control and inadequate control, there are battery metal shavings, positive tabs, etc. Hidden danger, once a hidden danger is formed, it will cause a safety hazard to the battery. In severe cases, there will be smoke, fire, or even explosion.
[0004] The traditional lithium battery safety detection method is mainly based on the physical and chemical indicators of the battery, and the operation process is complicated

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] A safety detection method for a lithium battery, comprising the following steps:

[0046] S1: Fully charge the battery, and the battery voltage reaches the upper limit voltage of the battery material system;

[0047] S2: Place the battery in a vacuum box;

[0048] S3: heat up the vacuum box, evacuate it, and keep it for a certain period of time;

[0049] S4: Check the temperature and appearance of the battery.

[0050] The lithium battery is tested according to the method described, and the temperature of the battery rises and the appearance of the battery is abnormal, so the product is judged to be unqualified.

Embodiment 2

[0052] A safety detection method for a lithium battery, comprising the following steps:

[0053] S1: Charge the battery with a small current, fully charge, and the battery voltage reaches the upper limit voltage of the battery material system 4.2V;

[0054] S2: Place the battery upside down in the vacuum box, with the negative pole of the battery facing up and the positive pole of the battery facing down;

[0055] S3: heat up the vacuum box, vacuumize, keep the temperature at 40 degrees Celsius, vacuum degree -0.075MPa (gauge pressure), and keep it for 20 minutes;

[0056] S4: Open the vacuum box, take out the battery, immediately detect the temperature of the battery and check the appearance of the battery.

[0057] The lithium battery is tested according to the method described, and the battery temperature is 2 degrees Celsius higher than the set vacuum box temperature, and the product is judged to be unqualified.

Embodiment 3

[0059] A safety detection method for a lithium battery, comprising the following steps:

[0060] S1: Form the battery, charge it with a small current, and fully charge it, and the battery voltage reaches the upper limit voltage of the battery material system 4.2V;

[0061] S2: Place the battery upside down in the vacuum box, with the negative pole of the battery facing up and the positive pole of the battery facing down;

[0062]S3: heat up the vacuum box, pump vacuum, keep the temperature at 40 degrees Celsius, vacuum degree -0.075MPa (gauge pressure), and keep it for 2 hours;

[0063] S4: Open the vacuum box, take out the battery, immediately detect the temperature of the battery and check the appearance of the battery.

[0064] The ternary lithium battery was tested according to the method described, the temperature of the battery increased, and the temperature of the battery was 1 degree Celsius higher than the set temperature of the vacuum box, and there was leakage, and...

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PUM

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Abstract

The invention belongs to the field of ternary lithium ion batteries, and particularly relates to a safety detection method of a ternary lithium ion battery, which comprises the following steps: fullycharging the battery until the battery voltage reaches the upper limit voltage of a battery material system; placing the battery in a vacuum box; heating the vacuum box and vacuuming, and keeping thetemperature for a certain time; and checking the temperature and appearance of the battery. The invention is a non-destructive detection method, and is simple and convenient to operate and safe in detection process.

Description

technical field [0001] The invention belongs to the field of ternary lithium-ion batteries, in particular to a safety detection method for ternary lithium-ion batteries. Background technique [0002] As a high-efficiency and environmentally friendly power storage medium, lithium batteries have been deeply used in various electronic products, electric tools and transportation facilities. However, with the gradual expansion of its application range, and the volumetric energy density and capacity of a single lithium battery are getting higher and higher, and more and more lithium battery explosion accidents have been reported, and its safety performance has become more and more popular. s concern. [0003] The main material of ternary lithium-ion batteries on the market is generally nickel-cobalt lithium manganese oxide as the positive electrode, and graphite as the negative electrode. During the production process of the battery, due to various factors such as insufficient pr...

Claims

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Application Information

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IPC IPC(8): G01R31/385
Inventor 李硕硕李春亮张联齐
Owner TIANJIN UNIVERSITY OF TECHNOLOGY