Sealing performance detection method for battery liquid injection port sealing structure

A technology of airtightness detection and detection method, which is applied in the field of airtightness detection of the sealing structure of the battery liquid injection port, can solve the problems of unreliability, complicated device, increased production cost, etc., and achieve the effect of high accuracy and simple operation

Active Publication Date: 2018-10-23
广舜检测技术(上海)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, for a completely sealed product, additional devices are required to inject helium into its interior, and it is not reliable
The current general-purpose devices for filling helium include: helium storage tanks, helium supply pipelines, helium metering pumps, etc. This device is complicated and increases the production cost of the industry

Method used

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  • Sealing performance detection method for battery liquid injection port sealing structure
  • Sealing performance detection method for battery liquid injection port sealing structure
  • Sealing performance detection method for battery liquid injection port sealing structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0061] Detection method of the present invention comprises the steps:

[0062] Pressurized helium stage:

[0063] Step 1: Use a sealing cover (that is, a sealing cover for suppressing helium gas) to seal the sealing welding part to generate a sealed cavity;

[0064] Step 2: Vacuumize the sealed chamber for 30 seconds;

[0065] Step 3: Fill the sealed cavity with helium and pressurize it, wherein the helium injection pressure is 0.5 (Mpa), and the pressure maintenance time is 10 minutes;

[0066] Step 4: Break out the helium gas, and after the helium gas is suppressed, disassemble and remove the sealing cover;

[0067] Helium detection stage:

[0068] Step 5: Place the product in the testing station, and use the isolation cover head (that is, the isolation cover for testing) to seal the sealing welding part to form a sealed cavity;

[0069] Step 6: Detect the leak rate of the sealed cavity with a large and medium leak rate detection instrument, and detect whether the seal b...

Embodiment 2

[0074] For products that have already ruled out large leaks, the following methods can also be used:

[0075] Pressurized helium stage:

[0076] Step 1: Use a sealing cover (that is, a sealing cover for suppressing helium gas) to seal the sealing welding part to generate a sealed cavity;

[0077] Step 2: Vacuumize the sealed chamber for 30 seconds;

[0078] Step 3: Fill the sealed cavity with helium and pressurize it, wherein the helium injection pressure is 0.5 (Mpa), and the pressure maintenance time is 10 minutes;

[0079] Step 4: Break out the helium gas, and after the helium gas is suppressed, disassemble and remove the sealing cover;

[0080] Helium detection stage:

[0081] Step 5: Place the product in the testing station, and use the isolation cover head (that is, the isolation cover for testing) to seal the sealing welding part to form a sealed cavity;

[0082] Step 6: vacuumize the sealed cavity for 30 seconds; then, perform helium mass spectrometry detection (he...

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Abstract

The invention proposes a sealing performance detection method for a battery liquid injection port sealing structure, i.e., the detection of whether the sealing of a welding part of a sealing plate atthe battery liquid injection port sealing structure and a battery housing is qualified or not. After pressurizing the welding part and a cavity between the sealing plate and the battery housing and injecting helium gas, it indicates that there is no sealing if the helium gas flowing out of the cavity is detected to exceed a certain threshold value/a first threshold value. If the helium gas flowingout of the cavity is detected to be the certain threshold value/the first threshold value but the helium gas can be detected to exceed a second threshold value under the vacuum condition, it indicates that the sealing is not qualified; if the helium gas does not exceed the second threshold value under the vacuum condition, it indicates that the sealing is qualified. A detection method for detecting the sealing performance of a battery cell without the advanced injection of helium is innovatively designed. The quality that helium is active gas, the method can achieve the inspection of sealingperformances through a conventional helium detection instrument. The method provided by the invention is simple in operation, is high in accuracy, and facilitates the industrial large-scale application.

Description

technical field [0001] The invention relates to the technical field of battery and helium detection, in particular to a method for detecting the sealing performance of a sealing structure of a liquid injection port of a battery. Background technique [0002] In order to detect the tightness of the sealing device, helium is usually used as a tracer gas. Since helium is an extremely active gas molecule, it is easy to escape from tiny places. By detecting the helium flow rate per unit time around the outer shell of the sealing device, that is Can determine if there are cracks or openings in the enclosure of the seal. For example, the current leak detection method for lithium batteries needs to fill the lithium batteries with helium in advance. After the lithium battery is manufactured, the leak rate value of overflowing helium gas is measured by means of helium gas detection, and then the leak rate of the lithium battery casing is determined. [0003] However, for a completel...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01M3/26
CPCG01M3/26
Inventor 应武金廷光落合英二郎
Owner 广舜检测技术(上海)有限公司
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