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Leak testing device and method for battery case

A battery case and leak detection technology, which is used in liquid/vacuum measurement for liquid tightness, and by measuring the acceleration and deceleration rate of fluid, etc. Simple, short leak detection time, and the effect of ensuring the pass rate

Inactive Publication Date: 2011-12-28
CHERY AUTOMOBILE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the process of realizing the present invention, the inventors have found that the prior art has at least the following problems: when the leakage point of the battery casing is small, the airflow generated is small, and it is difficult to observe the bubbles generated by the liquid

Method used

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  • Leak testing device and method for battery case

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Embodiment 1

[0026] see figure 1 , the embodiment of the present invention provides a battery case leak detection device, including a plugging head 7 and a vacuum system. The plugging head 7 is connected with the liquid injection port of the battery casing to be tested, and the liquid injection port is isolated from the outside world. The pipeline 14 of the vacuum pumping system is connected with the plugging head 7, and the liquid injection port is connected with the plugging head. 7 is in communication with the vacuum pumping system, and a vacuum pressure gauge 10 is provided on the pipeline 14 .

[0027] In the battery case leak detection device provided by the embodiment of the present invention, the vacuum system is turned on during leak detection, and the battery case to be tested is vacuumed through the plugging head 7, and the battery case to be tested is maintained after vacuuming. Vacuum degree, the pressure change is observed through the vacuum pressure gauge. Due to the high s...

Embodiment 2

[0035] An embodiment of the present invention provides a method for measuring the leak of a battery case by using the battery case leak detection device provided in Embodiment 1. The method mainly includes the following steps:

[0036] see figure 1 , seal the liquid injection port of the battery casing to be tested with the plugging head 7;

[0037] Turn on the vacuum system to vacuumize the battery case to be tested;

[0038] When the vacuum gauge 10 shows that the negative pressure is 80-100, the vacuum pumping system is closed;

[0039] Keeping the vacuum in the battery case to be tested for 5-15 seconds;

[0040] Observe whether the reading of the vacuum pressure gauge 10 changes, and judge whether there is a leak. When observing, if the reading of the vacuum pressure gauge 10 drops, it means that gas enters the battery casing to be tested from the outside, that is, there is a leak in the battery casing to be tested, and if the reading remains unchanged, it means that t...

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Abstract

The invention discloses a leak detection device and a leakage detection method for a battery shell, belonging to the field of power battery development. The leak detection equipment includes a plugging head and a vacuum system, the liquid injection port of the battery to be tested is connected to the plugging head, the vacuum system includes a pipeline, the plugging head is connected to the pipeline, the There is a vacuum pressure gauge on the pipeline. The present invention improves the sensitivity of battery casing leak detection by using a vacuum pressure gauge to test pressure changes, so that small leaks can also be detected, ensuring the pass rate of the battery casing, and at the same time has the advantages of simple operation and easy observation of detection results , Leak detection time is short and so on.

Description

technical field [0001] The invention relates to the field of power battery development, in particular to a leak detection device for detecting leakage points after welding of battery shells. Background technique [0002] In today's rapidly developing society, traditional energy sources such as oil, coal, and natural gas are decreasing as people increasingly exploit them. Clean, efficient, and large-capacity batteries such as lithium-ion batteries and fuel cells have become an effective way to solve environmental and energy problems faced by modern civilization. , and has been widely used in notebook computers, camcorders, digital cameras, mobile phones and power tools and other products. [0003] Large-capacity battery casings are mostly made of steel and closed by welding. Under harsh conditions such as extremely low temperature, thin air pressure, and high-power discharge power drive, the sealing performance of the large-capacity battery case is very high, so the battery ...

Claims

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Application Information

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IPC IPC(8): G01M3/34
Inventor 过磊张海军赵成旺
Owner CHERY AUTOMOBILE CO LTD
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