Detection method of lithium ion battery performance

A technology of lithium-ion battery and detection method, applied in the direction of secondary battery, secondary battery repair/maintenance, secondary battery charging/discharging, etc. Ignore security risks and other issues to achieve the effect of improving identification and prevention capabilities, shortening evaluation time, and reducing costs

Inactive Publication Date: 2016-11-30
LENOVO (BEIJING) LTD
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  • Summary
  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Existing battery performance evaluation tests generally need to pass 100-500pcs of batteries for all-round test and evaluation. The number of test batteries is huge, especially for the test of service life. The existing technology is to test through cycle performance, and the test cycle reaches More than 3 months, once the performance is found to be abnormal after the test is completed, it is often necessary to re-test or re-develop battery products, and the project development cycle will seriously lag
However, polymer lithium-ion batteries are currently adopting some industry-wide standards, such as product specifications, national standards, UL1642, IEEE62133, etc. At present, there is no method and standard for detailed detection and judgment of the internal impedance of the battery, and the risk identification is not perfect. It is easy to overlook some serious safety hazards, causing users to frequently have safety accidents without finding the root cause

Method used

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  • Detection method of lithium ion battery performance
  • Detection method of lithium ion battery performance
  • Detection method of lithium ion battery performance

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0085] Perform the following tests on high energy density polymer lithium-ion batteries:

[0086] Charge at 0.2C at 0°C, discharge at 0.5C, cycle 3 times, dissect and detect lithium deposition. The results show that serious lithium deposition occurs on the surface of the negative electrode, indicating that the internal impedance of the battery is too large and the service life is not good. presents a security risk.

[0087] The lithium analysis diagram on the surface of the battery is shown in figure 1 , where the left picture is the lithium analysis map on the front surface of the battery negative electrode, and the right picture is the lithium analysis map on the back surface of the battery negative electrode.

Embodiment 2

[0089] Perform the following tests on high energy density polymer lithium-ion batteries:

[0090] Charge at 0.2C at 0°C, discharge at 0.5C, cycle 20 times, dissect and detect the lithium deposition. The results show that there are more lithium deposition on the surface of the negative electrode, indicating that the internal impedance of the battery is large and the service life is not good. , a security risk.

[0091] The lithium analysis diagram on the surface of the battery is shown in figure 2 , where the left picture is the lithium analysis map on the front surface of the battery negative electrode, and the right picture is the lithium analysis map on the back surface of the battery negative electrode.

Embodiment 3

[0093] For high energy density polymer lithium-ion battery products, the following methods are used for rapid detection:

[0094] Charge at 0.2C at 0°C, discharge at 0.5C, cycle 15 times, dissect and analyze lithium; there is no lithium analysis on the surface of the negative electrode;

[0095] Charge at 0.3C at 5°C, discharge at 0.5C, cycle 15 times, dissect and analyze lithium; there is no lithium analysis on the surface of the negative electrode;

[0096] Charge at 1.0C at 15°C, discharge at 0.5C, cycle 15 times, dissect and analyze lithium; there is no lithium analysis on the surface of the negative electrode;

[0097] Charge at 1.5C at 25°C, discharge at 0.5C, cycle 15 times, dissect and analyze lithium; there is no lithium analysis on the surface of the negative electrode;

[0098] The lithium analysis diagram on the surface of the battery is shown in image 3 , where the left picture is the lithium analysis map on the front surface of the battery negative electrode, ...

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Abstract

The invention provides a detection method of lithium ion battery performance. Under different temperatures, charge and discharge processing is carried out on a lithium ion battery with different charge and discharge rates, lithium detection is carried out on the battery after 3-20 times of circulation, the service lifetime of the battery and the charge safety under different temperatures are estimated and predicted according to whether lithium precipitates out on the surface of a cathode in the battery, and the lithium precipitation degree is used to judge the impedance in the battery, so that the risk is rapidly estimated, the time of battery comprehensive performance estimation is shortened, the estimation efficiency is improved, and the cost of battery performance estimation is lowered, the identification and prevention capability of the battery safety risk is improved, and the testing number is only 10-20 pcs.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a detection method for the performance of lithium ion batteries. Background technique [0002] As a portable and mobile power source, lithium-ion batteries have been used in all aspects of modern life and become an indispensable necessity for human life and industrial production. [0003] However, since the large-scale commercialization of lithium-ion batteries, safety accidents related to them have hardly stopped. The safety of lithium-ion batteries has become a key factor restricting its further development, so the service life and safety performance testing of lithium-ion batteries are particularly important. [0004] Existing battery performance evaluation tests generally need to pass 100-500pcs of batteries for all-round test and evaluation. The number of test batteries is huge, especially for the test of service life. The existing technology is to test throug...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/36H01M10/44
CPCH01M10/44H01M10/443G01R31/36Y02E60/10
Inventor 邹啸天黄保宁罗炳财
Owner LENOVO (BEIJING) LTD
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