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Lithium ion battery self-discharging quick detecting method

A lithium-ion battery and detection method technology, applied in the direction of measuring electricity, measuring devices, measuring electrical variables, etc., can solve the problems of long discharge detection time, irreversible capacity loss of lithium-ion batteries, etc., and achieve short detection period and small irreversible capacity loss Effect

Inactive Publication Date: 2013-09-11
JIANGSU LITIAN NEW ENERGY TECH
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  • Abstract
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AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a lithium-ion battery self-discharge rapid detection method to solve the problem of long discharge detection time and easy to cause irreversible capacity loss of lithium-ion batteries

Method used

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  • Lithium ion battery self-discharging quick detecting method
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  • Lithium ion battery self-discharging quick detecting method

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Embodiment Construction

[0017] The present invention will be further described below in conjunction with the examples, but not as a limitation of the present invention.

[0018] Adopt 10AH lithium iron phosphate battery as the implementation object of the method of the present invention, the detection method of battery number 1~5 is to carry out constant current discharge with the electric current of 0.5 times of battery under the environment that temperature is 20~35 ℃, and voltage cuts off to 2.5V; 0.5 rate current for constant current charging, the charging capacity is 5% of the rated capacity; put the battery for 12 to 24 hours and then check the battery voltage; store the battery at 45°C for 3 days, and then check the battery voltage; compare the before and after storage Battery voltage difference, measured irreversible capacity loss.

[0019] The detection method for battery numbers 6 to 10 is to discharge the battery at a constant current of 0.3 times the current at a temperature of 20 to 35 °...

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Abstract

The invention discloses a lithium ion battery self-discharging quick detecting method. The method includes the steps that under the environment of 20-35 DEG C, a current, with multiplying power being 0.1-0.5, of the battery is discharged in a constant current mode, and voltage is cut off to 2.0-2.5 V; a current with the multiplying power being 0.1-0.5 is charged in a constant current mode, and charging capacity is 5% of rated capacity; after the battery is placed for 12-24 hours, the voltage of the battery is detected; the battery is placed under the environment of 45 DEG C for 3-5 days, and then the voltage of the battery is detected; voltage difference of the battery before being stored and the battery after being stored is compared. The detecting method only takes 3-5 days to detect the lithium ion battery with large self-discharging power, and therefore capacity loss generated during the storage process of the lithium ion battery is low.

Description

technical field [0001] The invention relates to a rapid self-discharge detection method of a lithium-ion battery, which belongs to the field of lithium-ion battery manufacturing. Background technique [0002] As a new type of environmentally friendly battery, lithium-ion batteries are currently widely used in the fields of power and energy storage. Compared with Ni-Cd and Ni-MH batteries, Li-ion batteries have a lower self-discharge rate. Affected by lithium-ion battery materials and manufacturing processes, lithium-ion batteries will also have a certain degree of self-discharge during storage. The battery with large self-discharge will decrease significantly after long-term storage, and its performance will be low, which cannot meet the requirements of use. Therefore, the selection of batteries with large self-discharge is particularly important. [0003] At present, the commonly used capacity method to detect self-discharge is to fully charge the battery or charge 50% of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/36
Inventor 任大卫吴军陆春海
Owner JIANGSU LITIAN NEW ENERGY TECH
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