CN116067574A

CN116067574A - Sealing waterproof test method

Info

Publication number: CN116067574A
Application number: CN202111290486.3A
Authority: CN
Inventors: 沈光杰; 张晓颖; 马少华
Original assignee: Zhengzhou Shenlan Power Technology Co Ltd
Current assignee: Zhengzhou Shenlan Power Technology Co Ltd
Priority date: 2021-11-02
Filing date: 2021-11-02
Publication date: 2023-05-05

Abstract

The invention provides a sealing waterproof test method, and belongs to the field of vehicle electronic product testing. The method comprises the following steps: 1) Selecting a plurality of battery products meeting the set waterproof level as sample pieces, and measuring and calculating the gas leakage quantity of each sample piece through an airtight test; 2) Taking the corresponding gas leakage amount as an airtight standard value under the corresponding waterproof grade; 3) Performing an airtight test on the battery to be tested in the waterproof test, and if the gas leakage amount of the battery to be tested is smaller than an airtight standard value, considering that the corresponding battery to be tested meets the corresponding waterproof grade; otherwise, the subsequent battery to be tested is not considered to meet the corresponding waterproof grade. According to the invention, the connection between the waterproof grade of the battery product and the airtight standard value is established, and whether the battery product accords with the set waterproof grade can be judged only by performing an airtight test on the battery product. The problem of current bubble test flow is long, test resource requirement is high is solved, the security risk of bubble test has been reduced simultaneously.

Description

Sealing waterproof test method

Technical Field

The invention relates to a sealing waterproof test method, and belongs to the field of vehicle electronic product testing.

Background

With global climate change, especially in urban waterlogging in rainy season in recent years, a large number of vehicles are damaged due to water soaking, so that the protection requirements of customers on automobile electronic products are higher and higher, especially on new energy automobile power assembly components, and serious potential safety hazards exist after water is fed into the devices. Therefore, in order to avoid the hidden danger of water inflow in the product after the vehicle is soaked, the requirements of the market on the protection level, particularly the waterproof level, of the automobile electronic product are more and more strict.

At present, a waterproof pool is used in the industry to directly carry out a water soaking test on a product, the water soaking time requirement is prolonged along with the increase of the requirements of the market on the waterproof grade, for example, 2 meters of water soaking 72h,5 meters of water soaking 72h and the like, so that the test resources in the industry are not matched with the requirements of the protection grade; in addition, directly carry out the test of soaking to the product, can damage the sample after the product intakes, and the detection of sealed waterproof failure position has difficulty, and some new energy product test seal waterproof failure even has the security risk.

Disclosure of Invention

The invention aims to provide a sealing waterproof test method which is used for solving the problem that safety risks exist in a water soaking test.

In order to achieve the above object, the present invention provides a sealing waterproof test method, comprising the steps of:

1) Selecting a plurality of battery products meeting the set waterproof level as sample pieces, and measuring and calculating the gas leakage quantity of each sample piece through an airtight test;

2) Taking the corresponding gas leakage amount as an airtight standard value under the corresponding waterproof grade;

3) Performing an airtight test on the battery to be tested in the waterproof test, and if the gas leakage amount of the battery to be tested is smaller than the airtight standard value, considering that the corresponding battery to be tested meets the corresponding waterproof grade; otherwise, the subsequent battery to be tested is not considered to meet the corresponding waterproof grade.

The beneficial effects of the invention are as follows: and establishing a connection between the waterproof grade of the battery product and the airtight standard value, and judging whether the battery product accords with the set waterproof grade or not only by performing an airtight test on the battery product. The problem of current bubble test flow is long, and test resource requirement is high is solved, and airtight test can not cause battery product to damage simultaneously, has reduced the safety risk of bubble test.

Further, in the above-described sealing waterproof test method, the airtight test is: injecting set gas into the ventilation valve of the battery to be tested, and detecting the set gas leakage quantity around the outside of the battery to be tested.

Further, in the sealing waterproof test method, the set gas is hydrogen or helium.

The hydrogen or helium is basically not in the air, so that the accurate measurement result of the gas leakage quantity is ensured. Helium gas chemical property is inactive, and safety risks caused by reaction in the testing process are avoided.

Further, in the above-described sealing waterproof test method, the set gas leakage amount is obtained by detecting a probe of the gas detection device around the outside of the battery to be tested.

Further, in the above-mentioned sealing waterproof test method, in step 1), whether the sample satisfies the waterproof level is judged by the bubble test.

In the sealing waterproof test method, the sample piece after the water soaking test is further placed into an environment box at a set temperature for drying before the air tightness test.

Further, in the sealing waterproof test method, airtight standard values corresponding to different waterproof grades are obtained for different waterproof grades, so that a battery pack sealing waterproof grade detection model is formed.

Drawings

FIG. 1 is a flow chart of the present invention.

Detailed Description

The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent.

As shown in a flowchart of fig. 1, the sealing waterproof test method of the invention comprises a calibration process and a detection process, and specifically comprises the following steps:

the calibrating process comprises the following steps:

1) And placing the same type of battery products into a waterproof box, performing a water soaking test according to a corresponding waterproof grade test method, and screening out the battery products meeting the set waterproof requirement as sample pieces.

As other embodiments, the sample may be obtained by other means, such as specially producing a batch of battery models satisfying the corresponding waterproof grade as the sample.

2) And placing each sample piece which is found out through the water soaking test and meets the corresponding waterproof grade in an environment box with the set temperature of 55 ℃ for a period of time, and removing residual water in the sample piece to avoid the influence of a water film sealing leakage point on a subsequent airtight test, wherein the specific placing time is determined according to the volume of the sample piece.

3) The leakage point and the leakage amount are determined by performing an airtight test on a sample, and particularly helium or hydrogen is injected into a ventilation valve of a sample battery. The ventilation valve is arranged on the battery pack and used for balancing the internal and external air pressure of the battery pack, has the function of ventilation and water isolation, and can be conveniently used for inflating the battery pack. Next, a leak point is detected around the sample using a probe of a helium or hydrogen gas detection apparatus that should be able to detect the amount of leakage in addition to the gas leakage. If a leakage point exists in the detection process, the helium or hydrogen detection equipment can give an alarm and display the leakage quantity.

4) And obtaining an airtight standard value under the corresponding waterproof grade according to the gas leakage amount of each sample to be detected in a mathematical statistical mode, wherein the airtight standard value can be realized by averaging and other methods.

A plurality of airtight standard values under different waterproof grades can be obtained to form a detection model, and waterproof grade measurement can be carried out on a product to be detected without soaking water. So far, the calibration process from the bubble water test of the waterproof grade measurement to the air tightness detection is completed.

The detection process comprises the following steps:

5) When the waterproof grade of the battery to be tested is measured, only an airtight test is needed, and if the gas leakage amount of the battery to be tested is smaller than the airtight standard value, the battery to be tested is considered to meet the requirement of setting the waterproof grade; otherwise, the battery to be tested is not considered to meet the corresponding waterproof grade.

Or the gas leakage amount reaches the airtight standard value under a certain waterproof level, the corresponding battery product can be considered to reach the corresponding waterproof level.

Claims

1. The sealing waterproof test method is characterized by comprising the following steps of:

2. The method of claim 1, wherein the air tightness test is: injecting set gas into the ventilation valve of the battery to be tested, and detecting the set gas leakage quantity around the outside of the battery to be tested.

3. The method according to claim 2, wherein the set gas is hydrogen or helium.

4. A sealing waterproof test method according to claim 3, wherein the set gas leakage amount is obtained by detecting a probe of a gas detection apparatus around the outside of the battery to be tested.

5. The method according to claim 4, wherein in step 1), whether the sample satisfies the waterproof level is judged by a bubble test.

6. The method according to claim 5, wherein the sample after the bubble water test is further baked in an environmental box at a set temperature before the air tightness test.

7. The method according to claim 6, wherein airtight standard values corresponding to different waterproof grades are obtained for the different waterproof grades, and a battery pack sealing waterproof grade detection model is formed.