Method for testing tightness of soft-packaging lithium battery

A technology of sealing detection and soft-pack lithium battery, applied in liquid/vacuum measurement for liquid tightness, by detecting the appearance of fluid at the leak point, etc., it can solve the destructive detection of heat sealing planing surface and the large thickness fluctuation. , soft pack battery deformation and other problems, to achieve the effect of simple and effective detection method, high detection accuracy and high efficiency

Inactive Publication Date: 2018-01-26
WANXIANG 123 CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] 1. Heat seal thickness and tensile strength cannot fully reflect heat seal performance
[0006] 2. Due to the presence of tab glue at the position of the tab, the thickness fluctuates greatly, and the airtightness cannot be detected through the actual heat-sealing thickness
[0007] 3. Heat seal thickness detection cannot achieve 100% full inspection
[0008] 4. The heat-seal planing surface inspection is a destructive inspection and cannot be fully inspected
[0009] 5. It consumes a lot of manpower and material resources, and the pouch battery will be seriously deformed

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A method for detecting the airtightness of a soft pack lithium battery, comprising the steps of:

[0026] (1) Battery injection: inject electrolyte into the battery cells.

[0027] (2) Evacuation: After liquid injection, the battery is evacuated in the vacuum chamber. After evacuation, the vacuum degree of the vacuum chamber is controlled at -65Mpa.

[0028] (3) Helium injection: Helium is passed into the vacuum chamber to fill the battery cell with helium, and after the vacuum degree in the vacuum chamber reaches -35Mpa, the cell is sealed.

[0029] (4) Evacuate helium inspection: transfer the battery to another vacuum chamber, and pressurize the battery cell with a clamp. The pressure of the clamp on the cell is 2.5Mpa. Then start vacuuming, the vacuum degree is controlled at -80Mpa, and the helium content in the vacuum chamber is detected.

Embodiment 2

[0031] A method for detecting the airtightness of a soft pack lithium battery, comprising the steps of:

[0032] (1) Battery injection: inject electrolyte into the battery cells.

[0033] (2) Evacuation: After liquid injection, the battery is evacuated in the vacuum chamber. After evacuation, the vacuum degree of the vacuum chamber is controlled at -50Mpa.

[0034] (3) Helium injection: Helium is passed into the vacuum chamber to fill the battery cell with helium, and after the vacuum degree in the vacuum chamber reaches -20Mpa, the cell is sealed.

[0035] (4) Evacuate helium inspection: transfer the battery to another vacuum chamber, and pressurize the battery cell with a clamp. The pressure of the clamp on the cell is 1Mpa. Then start vacuuming, the vacuum degree is controlled at -75Mpa, and the helium content in the vacuum chamber is detected.

Embodiment 3

[0037] A method for detecting the airtightness of a soft pack lithium battery, comprising the steps of:

[0038] (1) Battery injection: inject electrolyte into the battery cells.

[0039] (2) Evacuation: After liquid injection, the battery is evacuated in the vacuum chamber. After evacuation, the vacuum degree of the vacuum chamber is controlled at -75Mpa.

[0040] (3) Helium injection: Helium is passed into the vacuum chamber to fill the battery cell with helium, and after the vacuum degree in the vacuum chamber reaches -50Mpa, the cell is sealed.

[0041] (4) Evacuate helium inspection: transfer the battery to another vacuum chamber, and pressurize the battery cell with a clamp. The pressure of the clamp on the cell is 4Mpa. Then start vacuuming, the vacuum degree is controlled at -75Mpa to -90Mpa, and the helium content in the vacuum chamber is detected.

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PUM

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Abstract

The invention, which relates to the field of lithium ion battery preparation, discloses a method for testing the tightness of a soft-packaging lithium battery. The method comprises: (1), electrolyte injection into the battery is carried out; to be specific, an electrolyte is poured into a battery electric core; (2), evacuation is carried out; to be specific, the battery is vacuumized in a vacuum cabin after electrolyte injection; (3), helium gas injection is carried out; to be specific, helium gas is injected into the vacuum cabin and thus the battery core is filled with the helium gas, and then the electric core is sealed; and (4), evacuation and helium detection are carried out; to be specific, the battery is transferred to another vacuum cabin, the battery core is clamped by a clamp tocarry out pressurization, and then vacuumization is carried out to detect the helium content in the vacuum cabin. According to the method disclosed by the invention, the battery is protected from being damaged; one hundred percent of full detection is realized; and the detection accuracy is high and the cost is low.

Description

technical field [0001] The invention relates to the field of preparation of lithium-ion batteries, in particular to a method for detecting the airtightness of soft-pack lithium batteries. Background technique [0002] The airtightness of the soft pack lithium battery is one of the important indicators to measure the performance of the battery. Good sealing ensures that the battery will not leak air, liquid or flatulence during use. [0003] In the prior art, the sealing performance of the battery is usually tested by testing the heat-sealing thickness and the tensile strength of the aluminum-plastic film of the lithium-ion battery during the production process. However, in the actual detection process, it is difficult to detect and judge the real air leakage point through the heat seal thickness and tensile strength. There is also planing inspection, but general planing inspection is a destructive inspection, which can only be used as a random inspection and cannot be used...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01M3/20
Inventor 尹旭朱建良程道胜
Owner WANXIANG 123 CO LTD
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