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Method for testing cycle life of rechargeable battery

A cycle life and recharging technology, applied in the direction of measuring electricity, measuring electrical variables, measuring devices, etc., can solve the problems of degradation of charge and discharge capacity, no reliable test method, and reduction of the time required for testing.

Inactive Publication Date: 2008-11-05
SAMSUNG SDI CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] Therefore, since the charge and discharge capacity will be degraded according to the conventional cycle life test, no reliable test method has been proposed to reduce the time required for the test

Method used

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  • Method for testing cycle life of rechargeable battery
  • Method for testing cycle life of rechargeable battery
  • Method for testing cycle life of rechargeable battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] Embodiment 1: condition 8 of Fig. 6

[0057] Under the conditions of a charge rate of 1.5C, a charge cut-off current of 0.1C, and no charge-discharge recovery period in a normal charge-discharge method, it took 20 days to conduct a cycle life test with 500 cycles.

Embodiment 2

[0074] Example 2: Condition 13 of Figure 6

[0075] It took 41 days to conduct a cycle life test with 500 cycles under the conditions of a charge cut-off current of 0.1C, a discharge rate of 1.3C, a discharge cut-off voltage of 3.3V, and no charge-discharge recovery period in a normal charge-discharge method.

Embodiment 3

[0082] Embodiment 3: condition 14 of Fig. 6

[0083]It took 32 days to conduct a cycle life test with 500 cycles under the conditions of a charge cut-off current of 0.1C, a discharge rate of 1.3C, a discharge cut-off voltage of 3.55V, and no charge-discharge recovery period in a normal charge-discharge method.

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Abstract

The provided are two test methods for the cycle life test of a lithium rechargeable battery, which measures charge / discharge capacity by repeating charging and discharging lithium rechargeable battery. In one method, a constant current-constant voltage of charge rate of 1.5C and 4.2V, and a cut-off current of 0.1C are set to charge the battery, and a discharge rate of 1.0C and a cut-off voltage of 3.0V are set to discharge the battery, and there is no rest period between the charging and discharging. In another method, a constant current-constant voltage charge condition of charge rate of 1.0C and 4.2V, and a cut-off current of 0.1C are set to charge the battery, and a discharge rate of 1.3C and a cut-off voltage of 3.3V are set to discharge the battery, and there is no rest period between the charging and discharging. The present invention is appropriate to the cycle life test method of 500 cycles.

Description

[0001] Cross References to Related Applications [0002] This application claims priority and benefit from Korean Patent Application No. 10-2007-0041920 filed Apr. 30, 2007, the entire contents of which are hereby incorporated by reference. technical field [0003] The present invention relates to a method for testing the cycle life of a lithium rechargeable battery, and in particular to a method for testing the cycle life of a lithium rechargeable battery capable of reducing the time required for testing the cycle life. Background technique [0004] In recent years, rechargeable batteries capable of charging and discharging are widely used in mobile electronic / electrical equipment. In particular, high-capacity thin and light lithium rechargeable batteries are often used for laptop computers, camcorders, mobile phones, etc., which generally require portability. [0005] Generally, a lithium-ion rechargeable battery is composed of a lithium metal oxide that can be inserted / e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/36
CPCG01R31/3634G01R31/361G01R31/3648G01R31/3828G01R31/387G01R31/36
Inventor 金川洙
Owner SAMSUNG SDI CO LTD
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