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Detection device and device method for packaging effect of soft pack lithium batteries

A soft-pack lithium battery and detection device technology, which is applied in the direction of testing fluid tightness by detecting the dimensional change of the structural components to be tested, and using liquid/vacuum degree for liquid tightness measurement, etc., can solve the problem of injecting electrolyte, easy leakage detection Problems such as poor packaging position and long test cycle can achieve the effect of comprehensive inspection, significant application effect and short inspection cycle.

Inactive Publication Date: 2019-05-24
郑州中科新兴产业技术研究院 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Its limitation is that the test cycle is long, the electrolyte needs to be injected, and it is easy to miss the location of the bad package.

Method used

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  • Detection device and device method for packaging effect of soft pack lithium batteries
  • Detection device and device method for packaging effect of soft pack lithium batteries
  • Detection device and device method for packaging effect of soft pack lithium batteries

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] A method for detecting the encapsulation effect of a soft pack lithium battery, the steps are as follows:

[0041] (a) Dig the DNP aluminum-plastic film with a thickness of 152 μm, and the depth of both pits is 6 mm;

[0042] (b) Fix the tabs at the corresponding positions of the positive and negative tabs of the aluminum-plastic film, and perform top sealing and edge sealing on both sides;

[0043] (c) Put the packaged aluminum-plastic film under the pressure plate 5 of the above-mentioned vacuum chamber 1 after the temperature drops to room temperature, and the pressure plate 5 is in contact with the surface of the aluminum-plastic film, and close the vacuum chamber 1;

[0044] (d) Start the vacuum pump to slowly evacuate the vacuum chamber 1, and its internal pressure value reaches -90KPa;

[0045](e) As the internal air pressure increases, the volume of the aluminum-plastic film changes, driving the pressure plate 5 to rise, and the change in the height of the alum...

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Abstract

The invention discloses a detection device and a device method for the packaging effect of soft pack lithium batteries. The detection device comprises a vacuum chamber, a vacuum pump and a detection unit. The detection unit comprises a support frame disposed in the vacuum chamber, the support frame is provided with a locking device, and a dial gauge fixed to the support frame through the locking device is used for observing the swelling height of aluminum plastic films in the vacuum chamber and height variations with time. A pressure plate is connected to the bottom end of the dial gauge, drives a pointer of the dial gauge to rotate along with the expansion and contraction of the aluminum plastic films, and is used for observing value changes and determining the packaging effect. The detection method has the advantages that the cell packaging effect is simulated before batched packaging of cells, and interferences from other procedures are eliminated; the packaged aluminum plastic films are tested in the vacuum chamber, the interiors of the aluminum plastic films are highly stressed under the negative pressure of above -85KPa, whether the packaging is good or not can be tested in ashort time, and whether the aluminum plastic films can be expanded or not when the cells swell in later period can be simulated.

Description

technical field [0001] The invention relates to the technical field of lithium battery testing devices, in particular to a packaging effect testing device and a testing method for a soft-pack lithium battery. Background technique [0002] Due to its high energy density, flexible size design, and high safety, soft-pack lithium batteries are taking an increasing share in the market. However, the soft-pack lithium battery is packaged with aluminum-plastic film, which needs to be hot-melt-packaged during the production process. The quality of the packaging effect directly affects the scrap rate of the subsequent process and the electrical performance of the battery. If the packaging effect is not good, it will lead to the entry of external air, which will react with the electrolyte inside the battery cell to produce gas, causing the battery to swell, or the battery will leak, corrode the equipment, and cause a safety accident. [0003] In order to ensure the packaging effect o...

Claims

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Application Information

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IPC IPC(8): G01M3/36
Inventor 刘艳侠刘福园马安博刘凡于天恒张锁江
Owner 郑州中科新兴产业技术研究院
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