Method for screening abnormal lithium ion batteries

A lithium-ion battery and lithium-ion technology, applied in sorting and other directions, can solve the problem of hidden self-discharge leakage and abnormal cells that are difficult to screen out, and achieve the effect of increasing the friction of the pole piece

Pending Publication Date: 2021-08-13
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The traditional battery manufacturing process has a good screening effect on cells with obvious self-discharge abnormalities, but it is difficult to screen out cells with hidden self-discharge and abnormal leakage. This is why there are a large number of abnormal self-discharge cells on the market.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Embodiment 1 (23Ah square battery)

[0027] A method for screening abnormal lithium-ion batteries, the steps are as follows:

[0028] a. Blow dry the surface moisture of the battery after formation and cleaning, clamp it with a clamp, the clamp pressure is 23Kgf, transport it to the power supply cabinet, and fill the battery with a current of 0.2C;

[0029] b. Send the above-mentioned fully charged battery to the vibration table in the room with explosion-proof, exhaust and heating devices, set the vibration parameters of the battery pack according to the national standard GBT-31467, and the vibration time is 1h;

[0030] c. Ship out the batteries after the above-mentioned vibration after standing still for 8 hours, remove the batteries with obvious abnormal appearance (flatulence, liquid leakage, ablation, etc.), and put the remaining batteries into the capacity separation cabinet for capacity separation treatment, and calculate the battery The n value of the capacity...

Embodiment 2

[0033] Embodiment 2 (105Ah square battery)

[0034] a. Blow dry the surface moisture of the battery after formation and cleaning, clamp it with a clamp, the clamp pressure is 105Kgf, transport it to the power supply cabinet, and fill the battery with a current of 0.2C;

[0035] b. Send the above-mentioned fully charged battery to the vibration table in the room with explosion-proof, exhaust and heating devices, set the vibration parameters of the battery pack according to the national standard GBT-31467, and the vibration time is 2h;

[0036] c. Ship out the batteries after the above-mentioned vibrating batteries have been left to stand for 12 hours, remove the batteries with obvious abnormal appearance (flatulence, liquid leakage, ablation, etc.), and put the remaining batteries into the capacity separation cabinet for capacity separation treatment, and calculate the battery capacity The n value of the capacity retention rate, excluding flatulence, liquid leakage, ablation or...

Embodiment 3

[0039] Embodiment 3 (15Ah cylindrical battery)

[0040] a. Blow dry the surface moisture of the battery after formation and cleaning, clamp it with a clamp, the clamp pressure is 15Kgf, transport it to the power supply cabinet, and fill the battery with a current of 0.1C;

[0041] b. Send the above-mentioned fully charged battery to the vibration table in the room with explosion-proof, exhaust and heating devices, set the vibration parameters of the battery pack according to the national standard GBT-31467, and the vibration time is 0.5h;

[0042]c. Ship out the batteries after the above-mentioned vibrations have been left to stand for 16 hours, and remove the batteries with obvious abnormal appearance (flatulence, liquid leakage, ablation, etc.), and the remaining batteries are put into the capacity separation cabinet for capacity separation treatment, and the battery is calculated The n value of the capacity retention rate, excluding flatulence, liquid leakage, ablation or n...

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PUM

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Abstract

The invention discloses a method for screening abnormal lithium ion batteries, and relates to the technical field of lithium ion battery manufacturing. The method comprises the following steps: fixing and pressing the lithium ion batteries subjected to activation treatment by using a clamp, then carrying out calibration treatment, vibration test and still standing in sequence, and screening out the batteries with obviously abnormal appearances; carrying out capacity grading processing on the remaining batteries, calculating the capacity retention rate, and screening out the batteries with obviously abnormal appearances or abnormal retention rates; and performing still standing on the remaining batteries, then storing the batteries, recording voltage values before and after storing, calculating a K value, and screening out the batteries with abnormal K values. According to the method, the screening process steps of fixture fixing and pressing, charging of batteries to a high SOC after activation, vibration and the like are added in the existing lithium ion battery manufacturing process, so that the recognition degree for the abnormal batteries is greatly improved, the abnormal batteries can be effectively screened out, and the quantity of the abnormal batteries entering a subsequent working section is reduced, therefore, the ex-factory qualification rate of the batteries is ensured, and the after-sales maintenance cost is reduced.

Description

technical field [0001] The invention relates to the technical field of lithium ion battery manufacturing, in particular to a method for screening abnormal lithium ion batteries. Background technique [0002] In the lithium-ion battery manufacturing process, the battery must be screened to exclude abnormal cells. The main causes of abnormal battery cells are abnormal self-discharge and abnormal leakage. [0003] The self-discharge of the battery refers to the loss of battery capacity caused by the spontaneous reaction inside the battery when the external circuit is disconnected. There are many reasons for the abnormal self-discharge of lithium batteries, mainly divided into physical micro-short circuit and chemical reaction. The physical micro-short circuit is the direct cause of the low voltage of the lithium battery. Its direct manifestation is that after the battery is stored at room temperature and high temperature for a period of time, the battery voltage is lower than...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B07C5/34B07C5/344B07C5/02
CPCB07C5/34B07C5/344B07C5/02
Inventor 程世骑熊辉厉运杰程圆圆夏厚勇王利
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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