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Nondestructive testing method for lithium precipitation of lithium ion battery

A lithium-ion battery, non-destructive testing technology, applied in the direction of measuring electricity, measuring devices, measuring electrical variables, etc., to achieve the effect of simple and easy to understand, optimize battery design and charging method, and improve accuracy

Inactive Publication Date: 2020-04-28
SHENZHEN BAK POWER BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the non-destructive testing method for identifying and analyzing lithium by detecting the thickness change of soft-packed lithium-ion batteries has not been reported yet.

Method used

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  • Nondestructive testing method for lithium precipitation of lithium ion battery
  • Nondestructive testing method for lithium precipitation of lithium ion battery
  • Nondestructive testing method for lithium precipitation of lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] A non-destructive testing method for analyzing lithium in a lithium-ion battery, comprising the steps of:

[0055] S1. Use a 2.28Ah-435573 soft-packaged lithium-ion battery as the soft-packaged lithium-ion battery to be tested, discharge the soft-packaged lithium-ion battery to be tested at 0.2C to 2.5V, and then let it stand for 10 minutes;

[0056] S2. Charge the soft-packaged lithium-ion battery to be tested at a constant current of 0.5C to the set charging cut-off voltage of 4.2V, and then let it stand for 2 hours;

[0057] S2. During the charging process and the standing process, collect the thickness and voltage of the soft-packaged lithium-ion battery to be tested in real time, draw the thickness curve of the thickness with time in the same coordinate system, and the voltage with time. Time-varying voltage curves;

[0058] S3. If in the thickness graph, the thickness first decreases with time and then remains stable during the standing process after charging, th...

Embodiment 2

[0062] Based on Example 1, the only difference is that in step S2, the soft-packaged lithium-ion battery to be tested is charged at a constant current of 0.7C to the set charge cut-off voltage of 4.2V, and then left to stand for 2h.

Embodiment 3

[0064] Based on Example 1, the only difference is that in step S2, the soft-packaged lithium-ion battery to be tested was charged at a constant current of 1C to the set charging cut-off voltage of 4.2V, and then stood still for 2h.

[0065] figure 2 The thickness graph and the voltage graph provided for Embodiment 1 of the present invention, such as figure 2 As shown, the thickness of the soft-packaged lithium-ion battery to be tested gradually increases with constant current charging. After charging to a cut-off voltage of 4.2V, it is allowed to stand still for 2 hours. During the standing period, the voltage decreases to a certain extent due to the influence of polarization. , the thickness of the soft-packaged lithium-ion battery to be tested remains basically unchanged, indicating that there will be no lithium precipitation on the surface of the negative electrode when the battery is charged under the condition of charging at this charging rate.

[0066] image 3 The t...

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Abstract

The invention discloses a nondestructive testing method for lithium precipitation of a lithium ion battery. The method comprises the following steps: S1, charging a flexible package lithium ion battery to be tested to a set state, and standing; S2, in a charging process and a standing process, collecting a thickness of the flexible package lithium ion battery to be tested in real time, and drawinga thickness curve graph of the thickness changing with time; and S3, if the thickness curve graph shows that the thickness is firstly reduced along with time and then is kept stable, judging that theflexible package lithium ion battery to be tested has a lithium precipitation phenomenon. In the invention, whether lithium precipitation occurs in the lithium ion battery can be analyzed in a nondestructive manner only according to the acquired thickness curve of the flexible package lithium ion battery, operation is simple, easy to understand, convenient and rapid, judgment accuracy is improved, a user does not need to disassemble a battery cell in the battery, and safety is improved; and the method can be used as a basis for battery failure analysis in a battery aging process, and also canprovide a basis for optimizing a battery design and a charging method.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a non-destructive detection method for lithium analysis of lithium ion batteries. Background technique [0002] As a new energy technology, lithium-ion battery has been concerned by all walks of life. With its advantages of high energy density and long cycle life, it has been widely used in the field of 3C electronic products such as mobile phones and notebook computers, and lithium-ion batteries As a cross-industry among the three major industries of new energy, new energy vehicles and new materials that my country focuses on, the industry has entered a green channel of rapid development in recent years. With the advancement of technology and the increasingly fierce market competition, the performance requirements for lithium-ion batteries are becoming more and more stringent. The main trend is to require lithium-ion batteries to have higher energy density, better r...

Claims

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Application Information

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IPC IPC(8): G01R31/378G01R31/382G01R31/3835
CPCG01R31/378G01R31/382G01R31/3835
Inventor 曹志颖高红丰平潘庆瑞夏进阳李达喻学伦王亚捷陈辉宋华杰
Owner SHENZHEN BAK POWER BATTERY CO LTD
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