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Soft package battery encapsulation disqualification detection method

A technology of a soft pack battery and a detection method, applied in the field of lithium ion batteries, can solve the problems of long detection time, low efficiency, ineffective detection of false sealing, etc., and achieves the effects of low cost, simple operation and suitable for batch detection.

Inactive Publication Date: 2019-01-15
HUNAN LIFANG NEW ENERGY SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Scraping edge detection method, that is, to scrape the seal with a hard object, and detect the position of the fake seal in order to detect the phenomenon of softening or delamination. This method is inefficient and requires manual inspection one by one.
High-temperature and high-humidity method, that is, the battery cell is placed in a special box with a certain humidity and a certain temperature for a long time, and the moisture in the high-humidity environment penetrates into the battery cell through a false seal channel, and reacts with the electrolyte to produce gas, which is released from the cell surface. Swelling will appear after observation, but this kind of detection takes a long time and can only detect cells with obvious channels. It cannot effectively detect fake seals with "weak packaging strength"

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] This embodiment provides a method for detecting defective packaging of pouch batteries, including the following steps:

[0024] Step 1, place the pouch battery vertically in the sealed cavity, with the tabs of the pouch battery facing up;

[0025] Step 2, heating the sealed cavity to make the temperature in the sealed cavity reach 60°C, and maintain a constant temperature heating state;

[0026] Step 3, vacuumize the sealed chamber to make the vacuum degree in the sealed chamber reach -90Kpa, and keep it for 10 minutes;

[0027] Step 4, stop vacuuming, and perform humidification treatment on the inside of the sealed chamber, so that the humidity in the sealed chamber reaches 92%, until the vacuum reaches normal pressure, and keep for 1.5h;

[0028] Step 5: Stop heating and humidifying the sealed chamber, take out the pouch battery, and check the appearance of the pouch battery. If the pouch battery is corroded, blackened, swollen, or has white marks, the pouch battery ...

Embodiment 2

[0031] This embodiment provides a method for detecting defective packaging of pouch batteries, including the following steps:

[0032] Step 1, place the pouch battery vertically in the sealed cavity, with the tabs of the pouch battery facing up;

[0033] Step 2, heating the sealed chamber to make the temperature in the sealed chamber reach 45°C, and maintain a constant temperature heating state;

[0034] Step 3, vacuumize the sealed chamber to make the vacuum degree in the sealed chamber reach -80Kpa, and keep it for 15 minutes;

[0035] Step 4, stop vacuuming, and perform humidification treatment on the inside of the sealed chamber, so that the humidity in the sealed chamber reaches 80%, until the vacuum degree reaches normal pressure, and keep for 2 hours;

[0036] Step 5: Stop heating and humidifying the sealed chamber, take out the pouch battery, and check the appearance of the pouch battery. If the pouch battery is corroded, blackened, swollen, or has white marks, the po...

Embodiment 3

[0039] This embodiment provides a method for detecting defective packaging of pouch batteries, including the following steps:

[0040] Step 1, place the pouch battery vertically in the sealed cavity, with the tabs of the pouch battery facing up;

[0041] Step 2, heating the sealed cavity to make the temperature in the sealed cavity reach 65°C, and maintain a constant temperature heating state;

[0042] Step 3, vacuumize the sealed chamber to make the vacuum degree in the sealed chamber reach -95Kpa, and keep it for 5 minutes;

[0043] Step 4, stop vacuuming, and perform humidification treatment on the inside of the sealed chamber, so that the humidity in the sealed chamber reaches 95%, until the vacuum degree reaches normal pressure, and keep for 1 hour;

[0044] Step 5: Stop heating and humidifying the sealed chamber, take out the pouch battery, and check the appearance of the pouch battery. If the pouch battery is corroded, blackened, swollen, or has white marks, the pouch ...

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Abstract

The invention belongs to the technical field of lithium ion batteries, and particularly relates to a soft package battery encapsulation disqualification detection method. The method comprises the following steps: Step I, vertically placing a soft package battery in a seal cavity to keep a tab of the soft package battery upward; Step II, heating the seal cavity to allow the temperature in the sealcavity to 40 to 65 DEG C, and keeping a constant-temperature heating state; Step III, vacuumizing the seal cavity to allow the vacuum degree in the seal cavity to reach -80 to -95 Kpa for 5 to 15 min;Step IV, stopping vacuumizing, moisturizing the inside of the seal cavity to allow the humidity in the seal cavity to reach 80 to 90 percent till the vacuum degree reaches normal pressure, and keeping the vacuum degree for 1 to 2 h; and Step V, stopping heating and moisturizing the seal cavity, taking out the soft package battery, checking the appearance of the soft package battery, and selectingdisqualified products. Compared with the prior art, the soft package battery encapsulation disqualification detection method disclosed by the invention has the advantage that the detection efficiencyis more than or equal to 99 percent, is easy to operate and low in cost and can quickly detect disqualified soft package batteries.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion batteries, and in particular relates to a method for detecting defective packaging of soft pack batteries. Background technique [0002] Soft-pack lithium-ion batteries are composed of positive and negative electrodes, diaphragms, tabs, electrolytes and aluminum-plastic films. They have the characteristics of high energy density and good safety, and are widely used in power supplies for mobile phones, toys, and power vehicles. [0003] The sealing of the soft-pack lithium-ion battery is mainly guaranteed by the melting of the pp glue in the inner layer of the aluminum-plastic film under high temperature and high pressure. There are often counterfeit seals, and these counterfeit batteries are difficult to find through conventional visual inspection. If they flow out to end users, they will cause safety accidents. [0004] The detection methods for outgassing and counterfeit packaging mainly in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N33/00H01M2/02H01M50/10
CPCG01N33/00H01M50/10Y02E60/10
Inventor 朱登伟
Owner HUNAN LIFANG NEW ENERGY SCI & TECH
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