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Air tightness detection method

An air-tightness detection and air-tightness technology, which is used in the use of liquid/vacuum for liquid-tightness measurement, by detecting the appearance of fluid at the leak point, etc., to prevent leakage detection, improve detection efficiency, and simplify the process of inflation Effect

Active Publication Date: 2021-05-04
HUNAN HONGYI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Based on this, it is necessary to provide an air tightness detection method for the existing welding air tightness problem

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] see figure 1 and figure 2, Put the PP airbag 3 filled with helium gas into the liquid injection port 2 of the square lithium battery cover 1, the liquid injection hole 6 at the lower end is sealed with a rubber plug 5, and the upper end is welded with an aluminum welding sheet 4. The heat caused the air bag 3 to melt and release helium gas, and then the square lithium battery cover 1 is used in special equipment to detect whether there is excess helium gas. If excess helium is detected, the airtightness of the weld seal is poor. If no excess helium is detected, insert a needle into the rubber stopper 5 to create a gap, vacuum the square lithium battery cover 1 in a special device, and check again whether there is excess helium. The airtightness of the seal is good. If no excess helium is detected, remove the seal and check whether the airbag is damaged. If it shows that the air bag 3 is not damaged, the airtightness of the welding seal cannot be determined, and it i...

Embodiment 2

[0048] see figure 1 and figure 2 , Put the airbag 3 filled with helium gas into the liquid injection port 2 of the square lithium battery cover 1, the liquid injection hole 6 at the lower end is sealed with a rubber plug 5, and the upper end is designed with an acute-angled patch 4 to crush the airbag 3. Then weld and seal, pierce the airbag with an acute angle and release helium, and then use the square lithium battery cover 1 in a special equipment to detect whether there is excess helium. If excess helium is detected, the airtightness of the weld seal is poor. If no excess helium is detected, insert a needle into the rubber stopper 5 to create a gap, vacuum the square lithium battery cover 1 in a special device, and check again whether there is excess helium. The airtightness of the seal is good. If no excess helium is detected, remove the seal and check whether the airbag is damaged. If it shows that the air bag 3 is not damaged, the airtightness of the welding seal ca...

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Abstract

The invention provides an air tightness detection method. The method comprises the following steps: S1, sealing one end of a through hole of a workpiece to be detected by adopting a sealing element, placing an air bag sealed with tracer gas in the through hole, and welding and sealing the other end of the through hole; S2, performing air leakage detection on the workpiece to be detected for the first time; S3, damaging the sealing element, and carrying out second air leakage detection on the to-be-detected workpiece; S4, collecting results of the first air leakage detection and the second air leakage detection; and S5, dismounting the sealing element, collecting the state information of the air bag, and judging the air tightness of the through hole. The tracer gas is sealed in the air bag and placed in the through hole, and the air bag is damaged during welding sealing, so that the tracer gas is sealed in the through hole, the process of inflating the through hole is simplified, and the detection efficiency is improved. According to the invention, through detachable sealing and air leakage detection again, whether the air bag is damaged and whether the through hole is filled with the tracer gas are determined, so that leak detection caused by undamaged air bag is prevented.

Description

technical field [0001] The invention relates to the technical field of air tightness detection, in particular to a method for detecting air tightness of through holes. Background technique [0002] Lithium batteries have attracted much attention due to their high energy density, high output power, long charge and discharge life, fast charging, green and pollution-free, wide operating temperature range and small self-discharge. [0003] The internal chemical system of lithium batteries is very active, and it is very easy to have side reactions with external moisture and air, resulting in battery performance degradation or failure. Therefore, the air tightness of packaging is crucial to the reliability and safety of lithium batteries. How to effectively detect the airtightness of lithium batteries and ensure that defective packaging products will not flow into the consumer market is of great significance. [0004] At present, some square lithium batteries will use a rubber pl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01M3/20
CPCG01M3/20
Inventor 胡忠汉
Owner HUNAN HONGYI TECH CO LTD
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