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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 achieve rapid development, accelerate reaction consumption, and shorten the time required for testing. Effect

Active 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

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preparation example Construction

[0066] The preparation method of the present invention will be further described in detail in conjunction with specific examples below. It should be understood that the following examples are only for illustrating and explaining the present invention, and should not be construed as limiting the protection scope of the present invention. All technologies realized based on the above contents of the present invention are covered within the scope of protection intended by the present invention.

[0067] The experimental methods used in the following examples are conventional methods unless otherwise specified; the reagents and materials used in the following examples can be obtained from commercial sources unless otherwise specified.

Embodiment 1

[0069] The lithium-ion battery is produced according to the conventional manufacturing process, the positive electrode active material is lithium cobaltate, the negative electrode active material is graphite, and the battery design capacity is 4000mAh. The known charging upper limit voltage of the lithium ion battery is 4.35V, the known discharging lower limit voltage is 3.0V, and the known constant current charging rate is 0.7C.

[0070] Place the lithium-ion battery in an environment of 45°C, and the test process is as follows:

[0071] Discharge the fully charged lithium-ion battery. The discharge process is to discharge to 3.0V at a discharge rate of 0.5C, and then discharge and stand for 10 minutes;

[0072] To charge the discharged lithium-ion battery, first use 0.1C to charge to 80% of the design capacity, then charge to 4.4V at a rate of 0.7C, and then perform constant voltage charging at 4.4V to adjust the time used for constant voltage charging , so that the total t...

Embodiment 2

[0074] The lithium ion battery is the same as in Example 1, and the test method is different from Example 1.

[0075] The test method of this embodiment is as follows:

[0076] Place the lithium-ion battery in an environment of 50°C, and the test process is as follows:

[0077] Discharge the fully charged lithium-ion battery. The discharge process is to discharge to 3.0V at a discharge rate of 0.5C, and then discharge and stand for 30 minutes;

[0078] To charge the discharged lithium-ion battery, first use 0.1C to charge to 40% of the design capacity, then use 0.3C to charge to 70% of the design capacity, then use 0.7C to charge to 4.4V, and then start charging at 4.4V Carry out constant voltage charging, adjust the time used for constant voltage charging, so that the total time of each cycle is 24 hours, and record the corresponding number of cycles when the capacity retention rate reaches 90%. The results are shown in Table 1.

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Abstract

The invention provides a method for rapidly testing the cycle life of a lithium ion battery, and the method comprises the steps: carrying out the constant-current charging of the discharged and stood lithium ion battery under a low-rate condition, and carrying out the constant-current charging at a low rate until the capacity is smaller than or equal to 80% of the design capacity of the lithium ion battery; according to the method, by reducing the charging current when the battery is in a low SOC, an SEI film newly formed in each charging process is more compact, and the reaction consumption of available lithium ions in the battery is accelerated; meanwhile, by increasing the charging cut-off voltage of the battery, lithium ion reaction consumption, electrode material decline and electrolyte decomposition are accelerated; the long-time standing step of the high-temperature intermittent cycle is replaced or partially replaced by the constant-voltage charging step, various side reactions in the battery can be accelerated in the process, and then the cycle life of the lithium ion battery can be rapidly tested.

Description

technical field [0001] The invention belongs to the technical field of battery testing methods, and in particular relates to a method for quickly testing the cycle life of a lithium-ion battery. Background technique [0002] Lithium-ion batteries have been widely used in consumer electronics and electric vehicles due to their advantages such as high energy density, long cycle life, and no memory effect. Consumer electronic products, especially notebook computers, require batteries to still have good cycle and storage performance at relatively high temperatures. Terminal manufacturers require batteries to pass some specific high-temperature tests to simulate some of the actual working conditions of batteries. [0003] The current high-temperature performance test program for batteries is high-temperature intermittent cycle, and the specific steps are as follows: fully discharge the fully charged battery at high temperature, and then let it stand for a short time (the short r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/392G01R31/378
CPCG01R31/392G01R31/378Y02E60/10
Inventor 王昊鹏李素丽李俊义徐延铭
Owner ZHUHAI COSMX BATTERY CO LTD
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