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A rapid detection method for lithium battery cycle life

A technology of cycle life and detection method, applied in the direction of measuring electricity, measuring devices, measuring electrical variables, etc., can solve the problems of long test time, occupied test equipment for testing, and the production and delivery cycle of lithium battery packaging factories cannot meet customer requirements, etc. To achieve the effect of shortening the test time

Active Publication Date: 2021-11-12
深圳市思商科技有限公司
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Problems solved by technology

[0002] At present, the charge-discharge cycle life test of lithium batteries is stipulated in the recommended national standard or enterprise product specifications. It needs to be charged and discharged for about 300-400 times before comparing and judging the capacity of lithium-ion lithium batteries to determine whether the cycle life is qualified. , if the charge-discharge cycle test is carried out 300-400 times according to the test requirements, it usually takes more than two months, and the test time is too long. For the production and delivery cycle of lithium battery packaging factories, it cannot meet customer requirements, and it will also occupy the enterprise. More test equipment than other tests

Method used

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Embodiment Construction

[0031] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0032] It should be noted that all directional indications (such as up, down, left, right, front, back...) in the embodiments of the present invention are only used to explain the relationship between the components in a certain posture (as shown in the accompanying drawings). Relative positional relationship, movement conditions, etc., if the specific posture changes, the directional indication will also change accordingly.

[0033] In addition, in t...

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Abstract

The invention discloses a lithium battery cycle life rapid detection method, which comprises the following steps: obtaining the reference value of the capacity retention percentage after each charging and discharging cycle of the batch of lithium batteries to be tested; Discharge cycle, calculate the percentage of the actual capacity value and the initial capacity value of the lithium battery after the cycle, and obtain each time (N 1 , N 2 N 3 ...N n ) cycle actual capacity retention percentage; compare the actual capacity retention percentage of the lithium battery after N cycles with the reference value of the capacity retention percentage after N cycles of the lithium battery. Continue to repeat the cycle to obtain the actual capacity retention percentage value for comparison until the number of cycles reaches the preset number of times (recommended 50 times, use N 50 Indicates) after the end, and then determine whether the cycle life of the batch of lithium batteries is qualified. The invention shortens the test time of the existing lithium battery cycle life test, and predicts in advance whether the life of the lithium battery is qualified or not.

Description

technical field [0001] The invention relates to the technical field of detection of lithium batteries / lithium battery packs, in particular to a rapid detection method for the cycle life of lithium batteries. Background technique [0002] At present, the charge and discharge cycle life test of lithium batteries is stipulated in the recommended national standards or enterprise product specifications. It needs to be charged and discharged for about 300-400 times before comparing and judging the capacity of lithium-ion lithium batteries to determine whether the cycle life is qualified. , if the charge-discharge cycle test is carried out 300-400 times according to the test requirements, it generally takes more than two months, and the test time is too long, which cannot meet the customer's requirements for the production and delivery cycle of the lithium battery packaging factory, and will also occupy the enterprise. More test equipment than other tests. [0003] Therefore, the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/388G01R31/378G01R31/389G01R31/392
CPCG01R31/378G01R31/388G01R31/389G01R31/392
Inventor 刘国辉欧儒川
Owner 深圳市思商科技有限公司
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