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Non-destructive testing method for lithium precipitation of lithium ion battery

A lithium-ion battery, non-destructive testing technology, applied in the direction of secondary battery testing, secondary battery repair/maintenance, electrical measurement, etc., can solve problems such as complex calculation process and mathematical model, to improve stability and accuracy, avoid Potential safety hazards, detection methods are simple and easy to implement

Pending Publication Date: 2019-02-19
SHENZHEN BAK POWER BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This detection method has high accuracy, but the calculation process and mathematical model involved in the detection process are relatively complicated

Method used

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  • Non-destructive testing method for lithium precipitation of lithium ion battery
  • Non-destructive testing method for lithium precipitation of lithium ion battery
  • Non-destructive testing method for lithium precipitation of lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] The three-electrode constant current and constant voltage charging test is carried out on the lithium-ion battery to be tested in this embodiment, and the obtained three-electrode charging curve is shown in the attached figure 1 shown. attached by figure 1 It can be seen that during the charging process, the precipitation of metal lithium occurs at the end of constant current charging; during the constant voltage process, with the elimination of polarization, the potential of the negative electrode rises, causing the metal lithium precipitated on the surface of the negative electrode to re-embed into the negative electrode of the battery, thus Not conducive to detection and analysis. In the constant current process, the precipitation of metal lithium has a precipitation boundary rate. When the charge rate is greater than the limit rate, the lithium battery will precipitate metal lithium; when the charge rate is less than the limit rate, the lithium battery will not pre...

Embodiment 2

[0043] The detection method of lithium battery analysis lithium in the present embodiment is:

[0044] S01, at 20°C, charge the lithium-ion battery under test with a constant current of 1.0C to a voltage of 4.0V;

[0045] S02, after the constant current charging is completed, perform intermittent electrochemical excitation on the lithium-ion battery to be tested at 20°C, and measure the voltage of the lithium-ion battery to be tested during the intermittent electrochemical excitation process; intermittent electrochemical excitation method A constant current pulse electrochemical excitation is carried out every 3 minutes for the lithium-ion battery to be tested, the constant current pulse current is 2.0C, and the constant current pulse electrochemical excitation time is 10s.

[0046] S03, during the above constant current pulse electrochemical excitation process, record the voltage U of the lithium battery before the excitation 1 and the voltage U of the lithium battery after ...

Embodiment 3

[0049] The detection method of lithium battery analysis lithium in the present embodiment is:

[0050] S01, at 20°C, charge the lithium-ion battery under test with a constant current of 1.5C to a voltage of 4.0V;

[0051] S02, after the constant current charging is completed, perform intermittent electrochemical excitation on the lithium-ion battery to be tested at 20°C, and measure the voltage of the lithium-ion battery to be tested during the intermittent electrochemical excitation process; intermittent electrochemical excitation method A constant current pulse electrochemical excitation is carried out every 3 minutes for the lithium-ion battery to be tested, the constant current pulse current is 3.0C, and the constant current pulse electrochemical excitation time is 10s.

[0052] S03, during the above constant current pulse electrochemical excitation process, record the voltage U of the lithium battery before the excitation 1 and the voltage U of the lithium battery after ...

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Abstract

The invention discloses a non-destructive testing method for the lithium precipitation of a lithium ion battery. The invention tests the precipitation of lithium metal during the charging process, under the characteristics of the precipitation of lithium metal, thereby providing a non-destructive and effective method for the selection and the control of the charging strategy. The specific steps are as follows: performing a constant current charging on the battery to-be-measured; and then performing an intermittent electrochemical excitation on the battery; and analyzing the relationship between the battery voltage change and the time, if a transition phenomenon occurs in the rate of change of the difference in the voltage of the lithium ion battery to-be-measured before and after the electrochemical excitation, then the phenomenon indicates that the lithium ion battery has a lithium precipitation process. According to the non-destructive testing method for the lithium precipitation ofthe lithium ion battery, the method is simple and feasible in operation, does not need a complex calculation process; is suitable for different types of lithium-ion batteries; can be used for the testof the precipitation of the lithium metal during the power battery charging; and can also provide a reference basis for the design optimization of a battery cell.

Description

technical field [0001] The invention belongs to the field of lithium-ion battery testing, and in particular relates to a non-destructive testing method for lithium-ion battery analysis. Background technique [0002] In 2020, the state proposes that the specific energy of a lithium-ion battery cell should be ≥300Wh / kg, which is also the most direct solution to satisfy users' anxiety about the cruising range. The increase in the specific energy can reduce the number of single cells in the battery pack and weight, so as to achieve the purpose of reducing costs and improving overall performance. At present, the realization of this goal in the industry mainly adopts high-nickel positive electrode / Si-containing negative electrode. On the basis of high pass rate and high reliability, the current negative electrode is mainly graphite negative electrode, and a small amount of Si is added to increase the capacity of the negative electrode. Thereby increasing the specific energy of th...

Claims

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Application Information

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IPC IPC(8): G01R31/378H01M10/42
CPCH01M10/4285Y02E60/10
Inventor 李维张青勇高红曹志颖陈辉宋华杰
Owner SHENZHEN BAK POWER BATTERY CO LTD
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