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Method for assessing service life and security of lithium secondary battery

A lithium secondary battery and safety technology, which is applied in the field of rapid evaluation of lithium secondary batteries, can solve the problems of battery safety impact, failure to reflect safety performance, poor battery safety, etc., to reduce test time and improve capital turnover Favorable effect on speed, production and operation

Inactive Publication Date: 2009-04-01
GUANGZHOU FULLRIVER BATTERY NEW TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The shortcomings of current standards and practices are: 1. Using new batteries for safety testing cannot reflect the safety of batteries during use; Under normal production conditions, the safety performance of the battery in future use cannot be known in time, and the goods have already been delivered to the customer
3. UL1642 uses the battery after 25% cycle for safety test, which cannot reflect the safety performance of the battery in the middle and end of use. Generally, the safety performance in the end of the cycle is poor
4. Different cycle systems have different effects on the safety of the battery. Generally, the safety of the battery is poor after the system with a large charge-discharge rate is cycled. The current lithium secondary batteries generally use a rate cycle of 0.5~1C, which cannot reflect the large Safety performance after rate charge and discharge cycle

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038]For the 501417HS10C type 3.7V50mAh high-safety fast-charge polymer lithium-ion battery, the design discharge rate is 10C, use 4C (200mA) constant current to charge to 4.36V cut-off, put it aside for 5min, discharge it to 10C (500mA) to 3V, put it aside for 5min, After 200 cycles, you can know the fast charge and discharge life of the battery within 5 days; then the safety performance tests of charging, forced discharging, short circuit, nailing, thermal shock, extrusion and heavy object impact on the cycled battery. The specific test process is as follows:

[0039] 1. Cycle life test: use a lithium-ion battery automatic test system with a range of 5V2A.

[0040] 1.1 4C (200mA) constant current charging to 4.36V cut-off;

[0041] 1.2 Set aside for 5 minutes;

[0042] 1.3 10C (500mA) discharge to 3V;

[0043] 1.4 Set aside for 5 minutes;

[0044] 1.5 Cycle 1.1~1.4 steps 200 times;

[0045] 1.6 ends.

[0046] 2. Safety performance test: do a safety performance test on...

Embodiment 2

[0057] For the 452026HS10C type 3.7V130mAh high-safety fast-charge polymer lithium-ion battery, the design discharge rate is 10C, use 6C (780mA) constant current charge to 4.20V, turn constant voltage charge to 13mA cut-off, put it aside for 5min, and discharge at 10C (1300mA) To 3V, put it on hold for 5min, and cycle 200 times, you can know the rapid charge and discharge life of the battery within 5 days; then charge, force discharge, short circuit, nail stabbing, thermal shock, extrusion and heavy objects on the cycled battery Shock safety performance test. The specific test process is as follows:

[0058] 1. Cycle life test: use a lithium-ion battery automatic test system with a range of 5V2A.

[0059] 1.1 6C (780mA) constant current charging to 4.20V, constant voltage charging to 13mA;

[0060] 1.2 Set aside for 5 minutes;

[0061] 1.3 10C (1300mA) discharge to 3V;

[0062] 1.4 Set aside for 5 minutes;

[0063] 1.5 Cycle 1.1~1.4 steps 200 times;

[0064] 1.6 ends.

...

Embodiment 3

[0067] For the 502026HS20C type 3.7V130mAh high-safety fast-charge polymer lithium-ion battery, the design discharge rate is 20C, use 10C (1300mA) constant current to charge to 4.40V cut-off, put it aside for 5min, discharge it to 20C (2600mA) to 3V, put it aside for 5min, After 200 cycles, you can know the fast charge and discharge life of the battery within 3 days; then the safety performance tests of charging, forced discharge, short circuit, nail penetration, thermal shock, extrusion and heavy object impact are performed on the cycled battery. The specific test process is as follows:

[0068] 1. Cycle life test: use a lithium-ion battery automatic test system with a range of 5V2A.

[0069] 1.1 10C (1300mA) constant current charging to 4.40V cut-off;

[0070] 1.2 Set aside for 5 minutes;

[0071] 1.3 20C (2600mA) discharge to 3V;

[0072] 1.4 Set aside for 5 minutes;

[0073] 1.5 Cycle 1.1~1.4 steps 200 times;

[0074] 1.6 ends.

[0075] 2. Safety performance test: do...

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Abstract

The invention discloses a method for evaluating the service life and safety of lithium secondary batteries, belongs to the field of secondary batteries and more particularly relates to a rapid evaluation method for lithium secondary batteries. In the method, a lithium secondary battery is first charged and discharged cyclically with the multiplying power more than 3C to test the cycle life; after the circulation, the battery goes through safety test and safety evaluation, thus the cycle life and the safety of the lithium secondary battery after cycle use can be acquired fast. The invention can fast and effectively judge the cycle life and the safety of the lithium secondary battery after cycle, has great effect on guaranteeing the life and safety of batteries and can decrease the time of warehousing waiting time cycle life test of batteries and safety performance test after the cycle.

Description

technical field [0001] The method for evaluating the service life and safety of lithium secondary batteries of the invention belongs to the field of secondary batteries, and in particular relates to a rapid evaluation method for lithium secondary batteries. Background technique [0002] Cycle life and safety are important indicators of lithium secondary batteries. Current battery standards require the measurement of cycle life and safety of lithium secondary batteries. The UL1642 standard stipulates that the batteries used in the safety test items need to be new and have been charged and discharged. The charging and discharging cycle system is in accordance with the charging and discharging system recommended by the manufacturer, when it is cycled to 25% of the nominal cycle life. Or a continuous cycle of 90 days is terminated. The IEC standard stipulates that the battery used in the safety test project needs to be fully charged and just produced; the cycle test system is 1...

Claims

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Application Information

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IPC IPC(8): G01R31/36
Inventor 曾石华张翠芬
Owner GUANGZHOU FULLRIVER BATTERY NEW TECH
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