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Method for rapidly testing cycle life of lithium ion battery

A lithium-ion battery, cycle life technology, applied in the direction of measuring electricity, measuring electrical variables, measuring devices, etc., can solve the problem of long cycle life testing, etc., to facilitate rapid development, accelerate the occurrence of various side reactions, and shorten the test laboratory. effect of time

Pending Publication Date: 2021-06-11
ZHUHAI COSMX BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to improve the deficiencies of the prior art, the purpose of the present invention is to provide a method for quickly testing the cycle life of lithium-ion batteries, which can well solve the problem that the cycle life of lithium-ion batteries takes too long to test

Method used

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  • Method for rapidly testing cycle life of lithium ion battery

Examples

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preparation example Construction

[0052] The preparation method of the present invention will be further described in connection with the specific embodiments. It should be understood that the following examples are merely illustrative and explained, and it is not to be construed as limiting the scope of the invention. The techniques implemented by the above-described above-described above are covered in the scope of the invention.

[0053] The experimental methods used in the following examples are not particularly illustrative, all of which are conventional methods; reagents, materials used in the following examples, such as non-special instructions, can be obtained from the business pathway.

Embodiment 1

[0055] The lithium ion battery is made according to a conventional manufacturing process, and the positive electrode active material is lithium cobaltate, and the negative electrode active material is graphite, and the battery design capacity is 4000 mAh. The charging upper limit of the charging upper limit of the lithium ion battery is 4.35V, and the known discharge lower limit voltage is 3.0 V.

[0056] Place the lithium ion battery in a 45 ° C environment, the test process is as follows:

[0057] Discharge the charged lithium ion battery, the discharge process is discharged to 3.0V at a discharge ratio of 0.5c, and then the discharge is allowed to stand for 10 min;

[0058] Charge the lithium-ion battery after the discharge, charged to 4.4V at 0.7c rate, then constant pressure charging under 4.4V constant pressure, adjust the time of constant voltage charging, so that the total time of each cycle is 24 hours When the recording capacity retention ratio is 90%, the result is as s...

Embodiment 2

[0060] The lithium ion battery is the same as in Example 1, and the test method is different from that of Example 1.

[0061] The test method of this embodiment is as follows:

[0062] Place the lithium ion battery in a 50 ° C environment, the test process is as follows:

[0063] Discharge the charged lithium ion battery, the discharge process is discharged to 3.0V at a discharge ratio of 0.5c, and then the discharge is allowed to stand for 10 min;

[0064] Charging the lithium ion battery after discharge, the charging process at 8 laps before the lithium ion battery is: charged to 4.4V at 0.7c rate, then constant pressure charging under 4.4V constant pressure, adjust constant pressure charge charge Time, the total time each cycle is 24 hours;

[0065] From the first 9th circle, the charging process of the lithium ion battery is: charged to 4.36V at 0.7c rate, then constant pressure charging under 4.36V constant pressure, adjust the time of constant voltage charging, so that the t...

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Abstract

The invention provides a method for rapidly testing the cycle life of a lithium ion battery, which is characterized in that the charging cut-off voltage of a charging step in a conventional high-temperature intermittent cycle process is increased, and the process can accelerate lithium ion reaction consumption, electrode material decline and electrolyte decomposition; a constant-voltage charging step is used for replacing or partially replacing long-time standing of high-temperature intermittent circulation, and the process can accelerate various side reactions in the battery, so that the cycle life of the lithium ion battery can be rapidly tested; according to the rapid test method, the test rate of high-temperature intermittent circulation can be achieved on the premise of ensuring that the attenuation mechanism of the battery capacity is consistent, the time required by the test is greatly shortened, and rapid development of battery products is facilitated.

Description

Technical field [0001] The present invention belongs to the technical field of battery testing, and more particularly to a method of rapid testing lithium ion battery cycle life. Background technique [0002] Lithium-ion batteries have been widely used in consumer electronics, electric vehicles products due to the advantages of high energy density, long cycle life and no memory effect. Consumer electronics, especially laptops, requires battery still have good cycles and storage performance at higher temperatures. Terminal vendors require that the battery can be able to test some actual use conditions of the battery by some specific high temperature tests. [0003] At present, the current battery high-temperature performance test scheme is a high temperature intermittent cycle. The specific steps are as follows: The full discharge of the full battery is completely discharged, and the short time is stipulated (the well-known normal discharge charging of the terminal manufacturer is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/392G01R31/378
CPCG01R31/392G01R31/378
Inventor 楚豫寒李素丽李俊义徐延铭
Owner ZHUHAI COSMX BATTERY CO LTD
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