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Method for shortening the time of testing the cycle life of lithium ion batteries

A lithium-ion battery, cycle life technology, applied in the direction of measuring electricity, measuring devices, measuring electrical variables, etc., can solve the problems of market preemption, loss of opportunities, and dragging down the time to market of new products, achieving high accuracy, speeding up evaluation, The effect of speeding up time to market

Active Publication Date: 2016-01-27
NINGBO RONBAY LITHIUM BATTERY MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

According to the difference in charging and discharging conditions, the time for one cycle is about 3 to 5 hours, it takes more than 90 days to complete 500 cycles, and more than 180 days to complete 1,000 cycles, which greatly drags down the new battery. The time to market of the product may lose the opportunity because of this, and the market will be seized by other companies

Method used

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  • Method for shortening the time of testing the cycle life of lithium ion batteries
  • Method for shortening the time of testing the cycle life of lithium ion batteries
  • Method for shortening the time of testing the cycle life of lithium ion batteries

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] (1) Select 4 batteries and mark them as 1, 2, 3, 4 respectively;

[0032] (2) After the battery in the above step (1) is charged and discharged, each battery is in a different SOC state, and the cycle life of each battery is evaluated in a different SOC interval, and the battery marked as 1, Cycle between SOC0%~SOC25%, the charge cut-off voltage is 3.85V, and the discharge cut-off voltage is 3.00V; the battery marked 2 cycles between SOC25%~SOC50%, the charge cut-off voltage is 3.90V, and the discharge cut-off condition is 3.67V; the battery marked 3 cycles between SOC50%~SOC75%, the charge cut-off voltage is 4.01V, and the discharge cut-off voltage is 3.75V; the battery marked 4 cycles between SOC75%~SOC100%, the charge cut-off condition : Voltage 4.20V, current 100mA, discharge cut-off voltage 3.88V;

[0033](3) Table 2: The test conditions for the cycle life of the 4 batteries in the implementation case 1;

[0034]

[0035] (4) The cycle time of the batteries ma...

Embodiment 2

[0038] (1) Select 6 batteries, marked as 1, 2, 3, 4, 5, 6 respectively;

[0039] (2) After the battery in the above step (1) is charged and discharged, each battery is in a different SOC state, and the cycle life of each battery is evaluated in a different SOC interval, and the battery marked as 1, Cycle between SOC0%~SOC(1 / 6), the charge cut-off voltage is 3.81V, and the discharge cut-off voltage is 3.00V; the battery marked 2 cycles between SOC(1 / 6)~SOC(1 / 3) , the charge cut-off voltage is 3.87V, and the discharge cut-off condition is 3.65V; the battery marked with 3 circulates between SOC(1 / 3)~SOC50%, the charge cut-off voltage is 3.92V, and the discharge cut-off voltage is 3.69V; marked as The battery of 4 cycles between SOC50%~SOC(2 / 3), the charge cut-off voltage is 3.98, and the discharge cut-off voltage is 3.75V; the battery marked 5 is between SOC(2 / 3)~SOC(5 / 6). cycle, the charge cut-off voltage is 4.10V, and the discharge cut-off voltage is 3.80V; the battery marked ...

Embodiment 3

[0046] (1) Select 10 batteries, marked as 1, 2, 3, 4, 5, 6, 7, 8, 9, 10;

[0047] (2) After the battery in the above step (1) is charged and discharged, each battery is in a different SOC state, and the cycle life of each battery is evaluated in a different SOC range, at SOC0%~SOC10% cycle between, the charge cut-off voltage is 3.76V, and the discharge cut-off voltage is 3.00V; the battery marked 2 cycles between SOC10%~SOC20%, the charge cut-off voltage is 3.83V, and the discharge cut-off condition is 3.61V; marked 3 The battery cycled between SOC20%~SOC30%, the charge cut-off voltage is 3.87V, the discharge cut-off voltage is 3.66V; the battery marked 4 cycles between SOC30%~SOC40%, the charge cut-off voltage is 3.89V, The voltage is 3.68V; the battery marked with 5 cycles between SOC40% and SOC50%, the charge cut-off voltage is 3.91V, and the discharge cut-off voltage is 3.70V; the battery marked with 6 cycles between SOC50% and SOC60%. The cut-off voltage is 3.96V, and th...

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Abstract

The invention provides a method for shortening the time of testing the cycle life of lithium ion batteries. According to the method, N batteries are selected for testing of the cycle life, and the cycle life of each battery is tested in different SOC (charged) states. In this way, the testing time for the cycle life of lithium ion batteries is greatly shortened, the testing cost is reduced, the introduction time for new products and new technologies is accelerated, and the product competitiveness for battery manufacturers and relevant material manufacturers is improved. According to the method, if 4<=N<=10, the testing time can be greatly reduced, the testing accuracy is high, and not too many testing devices will be occupied; if N=4, the testing time is 50%-70% reduced; if N=6, the testing time is 65%-75% reduced; and if N=10, the testing time is 70%-80% reduced. A difference between a capacity result obtained by the method and a capacity result of a conventional method is within 5%, and a difference between a thickness result of the method and a thickness result of the conventional method is within 8%. Therefore, it is proved that the method of the invention is greatly consistent with the conventional method.

Description

technical field [0001] The invention relates to a method for evaluating a lithium ion battery, in particular to a method for shortening the cycle life evaluation time of a lithium ion battery. Background technique [0002] Due to the dwindling of non-renewable resources such as coal, oil, and natural gas, and the deteriorating environmental problems caused by them, the demand for new, efficient, and environmentally friendly energy is gradually increasing with the development of the global economy. As a new energy source, lithium-ion batteries are not only widely used in 3C fields such as mobile phones, notebook computers, and digital cameras due to their environmental friendliness, high energy density, long cycle life, wide operating temperature range, and long storage time. Applications, but also in power tools, electric vehicles, electric bicycles and other power fields are favored. [0003] In order to ensure the usability and safety of lithium-ion batteries, it is parti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/36
Inventor 温美盛袁徐俊陈涨宗陈明峰王顺林
Owner NINGBO RONBAY LITHIUM BATTERY MATERIAL CO LTD
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