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Airtightness detection method and device

A technology of air tightness detection and tested parts, which is applied in the direction of liquid tightness measurement by using liquid/vacuum degree, and by measuring the increase and deceleration rate of fluid, etc., which can solve the problems of long time consumption in the test process and low test efficiency. , to achieve the effect of saving detection time and improving detection efficiency

Inactive Publication Date: 2019-03-29
QINGHAI CONTEMPORARY AMPEREX TECH +1
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AI Technical Summary

Problems solved by technology

[0004] However, in the above test process, the test process includes inflation, voltage stabilization, and testing. Each battery pack needs to complete the entire test process. Finally, it is determined whether the battery pack has airtight defects according to the pressure difference. This test process consumes The time is longer, resulting in low test efficiency

Method used

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  • Airtightness detection method and device

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Embodiment Construction

[0057] The present application will be described in further detail below through specific embodiments and in conjunction with the accompanying drawings.

[0058] This application provides an airtightness detection method, which can be used to detect any parts with sealing requirements. This application takes the battery pack box as an example to describe the airtightness detection method in detail. It should be understood that the tested part is not limited to the case of the battery pack, but may also be other parts, such as air-conditioning cooling pipelines and the like.

[0059] Such as figure 1 As shown, the detection method includes the following steps:

[0060] Step S20, inflate the DUT and the standard test piece. During the inflation process, the air pressure in the DUT and the standard test piece increases with the inflation time.

[0061] At the same time, during the inflation process, step S40 is executed to establish a time-pressure change curve of the tested ob...

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Abstract

The invention relates to an airtightness detection method and device. The detection method comprises the following steps that S20) a tested piece and a test standard component are inflated; S40) in the inflation phase, a time-pressure change curve of the tested piece is established; and S60) different time points are selected successively from the time-pressure change curve, whether a pressure value of the tested piece in each time point is greater than or equivalent to a preset pressure value is determined, if YES, the step S20 is repeated, and otherwise, it is determined that the airtightness of the tested piece is unqualified. According to the detection method, the time-pressure change curve of the tested piece is established, the time-pressure change curve is compared with preset pressure values, and if the pressure value in the time-pressure change curve is lower than the correspodnign pressure value, the airtightness of the tested piece is determined to be unqualified, it is notrequired to continue inflating the tested piece, and the test process is ended; and thus, detection time is reduced and the detection efficiency is improved.

Description

technical field [0001] The present application relates to the technical field of air tightness detection, in particular to an air tightness detection method and device. Background technique [0002] According to industry certification standards, the box of the battery pack and the cooling pipeline placed in the box should meet the airtightness requirements. If there is a problem with the airtightness of the cooling pipeline or the box, it will lead to poor insulation or short circuit, damage to components or cause safety accidents. [0003] According to the principle of the differential pressure measurement method, the test standard part and the battery pack are filled with compressed gas of the same pressure at the same time. The pressure difference determines whether the airtightness of the battery pack is qualified. [0004] However, in the above test process, the test process includes inflation, voltage stabilization, and testing. Each battery pack needs to complete th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01M3/26
CPCG01M3/26
Inventor 茆康前林文裕
Owner QINGHAI CONTEMPORARY AMPEREX TECH
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