Air tightness testing equipment

Abstract

This application relates to an airtightness testing device, comprising: a housing having a receiving cavity, an air inlet and an air outlet communicating with the receiving cavity, the air inlet communicating with the air outlet of a fixture to be tested, and the air outlet communicating with the air inlet of the fixture to be tested; a testing component disposed in the receiving cavity; a first suction component disposed in the receiving cavity, the first suction component including a first air port, a second air port, and a third air port communicating with each other, the first air port communicating with the testing component; a circulation pipeline assembly disposed in the receiving cavity, communicating the air inlet and the second air port, and communicating the air outlet and the third air port; and a roller assembly disposed below the housing. The technical solution of this application effectively solves the technical problem that traditional airtightness testing devices are fixed in position and cannot be moved, resulting in limited application scenarios.

Description

Technical Field

[0001] This application relates to the field of battery testing technology, and in particular to an airtightness testing device. Background Technology

[0002] With the development of new energy technologies, batteries are being used in an increasing number of applications. A battery pack consists of multiple batteries, and its airtightness directly affects the operational safety of the battery system. If the battery pack's airtightness does not meet requirements, dust, moisture, or even leakage can occur, affecting battery pack aging, damaging the battery system, and even causing safety accidents. Therefore, testing the airtightness of battery packs is particularly important.

[0003] In related technologies, testing devices are generally used to test the airtightness of battery packs. Because the testing device is fixed in location, the battery pack must first be moved to the designated location before the airtightness test is performed. Traditional testing devices can only test portable battery packs, limiting their application scenarios. Summary of the Invention

[0004] This application provides an airtightness testing device to solve the technical problem that traditional airtightness testing devices are fixed in position and cannot be moved, which limits their application scenarios.

[0005] Therefore, this application provides an airtightness testing device, comprising: a housing having a receiving cavity, an air inlet and an air outlet communicating with the receiving cavity, the air inlet communicating with the air outlet of a fixture to be tested, and the air outlet communicating with the air inlet of the fixture to be tested; a testing component disposed in the receiving cavity; a first suction component disposed in the receiving cavity, the first suction component including a first air port, a second air port and a third air port communicating with each other, the first air port communicating with the testing component; a circulation pipeline assembly disposed in the receiving cavity, communicating with the air inlet and the second air port, and communicating with the air outlet and the third air port; and a roller assembly disposed below the housing.

[0006] In one possible implementation, the circulation pipe assembly includes an intake pipe, an exhaust pipe, a first valve body, and a second valve body. The exhaust pipe is located between the outlet port and the third port, and the first valve body is located in the exhaust pipe. The intake pipe is located between the inlet port and the second port, and the second valve body is located in the intake pipe.

[0007] In one possible implementation, the detection assembly includes a first detection element and an industrial control computer. The first detection element is disposed in a receiving cavity and communicates with a first air port; the industrial control computer is disposed in the receiving cavity and is electrically connected to the first detection element.

[0008] In one possible implementation, the detection component further includes a display unit located above the housing and electrically connected to the industrial control computer.

[0009] In one possible implementation, the detection assembly further includes a second detection element electrically connected to an industrial control computer. The second detection element is located inside the tooling to be tested and is used to detect the pressure inside the tooling.

[0010] In one possible implementation, the airtightness testing device further includes a testing pipe assembly disposed between the first air inlet and the first testing element.

[0011] In one possible implementation, the detection pipeline assembly includes a high negative pressure pipeline, a low negative pressure pipeline, a third valve body, and a fourth valve body. The high negative pressure pipeline connects to the first air port and the first detection element, and the third valve body is located in the high negative pressure pipeline. The low negative pressure pipeline connects to the first air port and the first detection element, and the fourth valve body is located in the low negative pressure pipeline.

[0012] In one possible implementation, the testing fixture includes a testing box and a battery pack to be tested, with the battery pack to be tested located inside the testing box. The airtightness testing equipment also includes a second suction component, which is connected to the testing box and electrically connected to the testing components. The first suction component is connected to the inner cavity of the battery pack to be tested through a second air port and a third air port.

[0013] In one possible implementation, a support leg assembly is also included, which is located below the housing and inside the roller assembly.

[0014] In one possible implementation, the roller assembly can be folded into the housing; or, the leg assembly can be folded into the housing.

[0015] According to the embodiments of this application, the airtightness testing device includes: a housing having a receiving cavity, an air inlet and an air outlet communicating with the receiving cavity, the air inlet communicating with the air outlet of the tool to be tested, and the air outlet communicating with the air inlet of the tool to be tested; a testing component disposed in the receiving cavity; a first suction component disposed in the receiving cavity, the first suction component including a first air port, a second air port and a third air port communicating with each other, the first air port communicating with the testing component; a circulation pipeline assembly disposed in the receiving cavity, communicating the air inlet and the second air port, and communicating the air outlet and the third air port; and a roller assembly disposed below the housing. The portable airtightness testing device provided in this application embodiment integrates various components through a housing, increasing the overall integrity of the testing device; a circulating testing system is formed by a first suction component, a testing component, and a circulating pipeline component, enabling gas circulation within the tooling under test in a low differential pressure environment through the circulating pipeline component and the first suction component, accelerating the evaporation and diffusion of leaked electrolyte, enhancing the detection signal, and improving the accuracy of the detection results on the testing component side, thereby enabling airtightness testing of the tooling under test in a low differential pressure environment; and the device is movable through a roller assembly located at the bottom of the housing, enriching the application scenarios and enhancing the versatility and universality of the airtightness testing device. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, those skilled in the art can obtain other drawings based on these drawings without creative effort. In addition, in the drawings, the same parts use the same reference numerals, and the drawings are not drawn to scale.

[0017] Figure 1 This is a three-dimensional structural schematic diagram of the airtightness testing device provided in the embodiments of this application; Figure 2 This is a simplified schematic diagram of the airtightness testing device provided in the embodiments of this application.

[0018] Explanation of reference numerals in the attached figures: 100. Outer shell; 101. Receiving cavity; 102. Air inlet; 103. Air outlet; 200. Detection component; 210. First detection piece; 220. Industrial control computer; 230. Display component; 240. Second detection piece; 300. First suction component; 400, Circulation piping assembly; 410, Intake pipe; 420, Exhaust pipe; 430, First valve body; 440, Second valve body; 500. Roller assembly; 600. Second suction component; 700. Inspection pipeline assembly; 710. High negative pressure pipeline; 720. Low negative pressure pipeline; 730. Third valve body; 740. Fourth valve body; 800, support legs; 11. Testing box; 12. Battery pack to be tested. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0020] Air tightness is a crucial indicator affecting battery safety. Battery packs typically have a sealed internal cavity to encapsulate one or more individual battery cells. If liquids or other foreign matter enters the pack, it can easily cause short circuits in the individual cells, leading to thermal runaway and ultimately a safety incident, impacting the lithium battery's safety performance. Furthermore, existing air tightness testing devices are generally fixed at a designated location on the ground. Testing a battery pack requires moving it to that location before testing, a cumbersome process with low efficiency and limited applicability, only suitable for mobile battery packs.

[0021] Based on this, see Figures 1 to 2 This application provides an airtightness testing device, comprising: a housing 100 having a receiving cavity 101, the housing 100 having an air inlet 102 and an air outlet 103 communicating with the receiving cavity 101, the air inlet 102 communicating with the air outlet of the tool to be tested, and the air outlet 103 communicating with the air inlet of the tool to be tested; a testing component 200 disposed in the receiving cavity 101; a first suction component 300 disposed in the receiving cavity 101, the first suction component 300 including a first air port, a second air port and a third air port communicating, the first air port communicating with the testing component 200; a circulation pipe assembly 400 disposed in the receiving cavity 101, communicating the air inlet 102 with the second air port, and communicating the air outlet 103 with the third air port; and a roller assembly 500 disposed below the housing 100. The circulating pipeline assembly 400 includes an intake pipe 410, an exhaust pipe 420, a first valve body 430, and a second valve body 440. The exhaust pipe 420 is located between the exhaust port 103 and the third port, and the first valve body 430 is located within the exhaust pipe 420. The intake pipe 410 is located between the intake port 102 and the second port, and the second valve body 440 is located within the intake pipe 410. The testing fixture includes a testing box 11 and a battery pack 12 to be tested. The battery pack 12 to be tested is located inside the testing box 11. The airtightness testing equipment also includes a second suction component 600, which is connected to the testing box 11 and electrically connected to the testing assembly 200. The first suction component 300 is connected to the inner cavity of the battery pack 12 to be tested through the second and third ports.

[0022] In this embodiment, a portable airtightness testing device is provided. The various components can be integrated through the housing 100, increasing the overall integrity of the testing device. A circulating testing system is formed by the first suction component 300, the detection component 200, and the circulation pipeline assembly 400. This system allows for gas circulation within the tooling under test in a low-pressure differential environment via the circulation pipeline assembly 400 and the first suction component 300, accelerating the evaporation and diffusion of leaked electrolyte, enhancing the detection signal, and improving the accuracy of the detection results on the detection component 200 side. This enables airtightness testing of the tooling under test in a low-pressure differential environment. Furthermore, the device is movable via a roller assembly 500 located at the bottom of the housing 100, enriching its application scenarios and enhancing the versatility and universality of the airtightness testing device.

[0023] Specifically, the airtightness testing equipment is configured as a combination of at least a housing 100, a testing component 200, a first suction component 300, a circulation pipeline assembly 400, a roller assembly 500, and a second suction component 600. Simultaneously, the testing fixture is configured as a combination of at least a testing box 11 and a battery pack 12 to be tested. The battery pack 12 is placed inside the testing box 11, the inner cavity of which can at least accommodate the battery pack 12, suitable for airtightness testing of different models of battery packs 12. The housing 100 can be a near-rectangular box structure with a receiving cavity 101 to accommodate and protect other components, enhancing the overall integrity and structural compactness of the airtightness testing equipment and extending the service life of each component. The testing component 200 is used to detect the concentration of volatile substances inside the battery pack 12 to determine the leakage status of the battery pack 12 based on the concentration value. The first suction component 300 can be a vacuum pump, which can be fastened to the base plate of the housing 100 by fasteners such as screws / bolts, or it can be connected to the base plate of the housing 100 by welding or other means. The first suction component 300 is provided with a three-way valve, which is provided with a first air port, a second air port and a third air port that are interconnected. The first air port can be connected to the detection component 200 through a hose / metal tube. The circulation pipeline assembly 400 is configured as a combination of at least an intake pipe 410, an exhaust pipe 420, a first valve body 430, and a second valve body 440. The intake pipe 410 can be a PU hose, with its two ends connected to the air inlet 102 and the second air port, respectively. The exhaust pipe 420 can be a PU hose, with its two ends connected to the air outlet 103 and the third air port, respectively. The first valve body 430 and the second valve body 440 are connected in parallel between the battery pack 12 to be tested and the first suction component 300. The first valve body 430 and the second valve body 440 can be solenoid valves, both of which are electrically connected to the industrial control computer 220 in the detection assembly 200. Thus, the air inlet 102 can be connected to port A of the battery pack 12 under test via an external pipe, and the air outlet 103 can be connected to port B of the battery pack 12 under test via an external pipe. This enables communication between the first suction component 300 and the internal space of the battery pack 12 under test, allowing the first suction component 300 to draw in and discharge gas from the battery pack 12 under test, thereby achieving gas circulation within the battery pack 12. The flow of circulating air accelerates the evaporation and diffusion of leaked electrolyte, shortens waiting time, and improves the efficiency of airtightness testing. The roller assembly 500 may include four universal wheels, which are respectively located at the four corners of the bottom of the housing 100. This allows for easy movement of the airtightness testing equipment, enhancing its spatial mobility; it also enables airtightness testing of the battery pack 12 in a fixed position, improving its versatility and universality.

[0024] In one possible implementation, the detection assembly 200 includes a first detection element 210 and an industrial control computer 220. The first detection element 210 is disposed within the receiving cavity 101 and communicates with a first air port; the industrial control computer 220 is disposed within the receiving cavity 101 and electrically connected to the first detection element 210. The detection assembly 200 also includes a display element 230, which is disposed above the housing 100 and electrically connected to the industrial control computer 220. The detection assembly 200 further includes a second detection element 240 electrically connected to the industrial control computer 220. The second detection element 240 is disposed inside the tooling to be tested and is used to detect the pressure within the tooling.

[0025] In this embodiment, the specific configuration of the detection component 200 is optimized. Specifically, the detection component 200 is configured as a combination of at least a first detection element 210, an industrial control computer 220, a display element 230, and a second detection element 240. The first detection element 210 can be a detection instrument such as a quadrupole mass spectrometer, an ion trap mass spectrometer, or a VOC mass spectrometer, which can detect the concentration of volatile substances in the battery pack 12 under test. The industrial control computer 220 can be a control host, which is equipped with a chip motherboard for receiving data information transmitted from the first detection element 210 and the second detection element 240, processing the aforementioned data information, and transmitting the processed information to the display element 230 for display, so that the user can view it. The display element 230 can be a display screen, preferably an LED liquid crystal display screen, which is electrically connected to the industrial control computer 220 via a cable, and can receive the processed data information transmitted from the industrial control computer 220 and display it on the display screen for the user to view. The second detection element 240 can be a pressure sensor or a pressure gauge, which is installed in the inner cavity of the battery pack 12 under test and the detection box 11. It can monitor the pressure value in the battery pack 12 under test and the detection box 11 in real time, and transmit the monitored pressure value to the industrial control computer 220. The industrial control computer 220 controls the circulation pipeline assembly 400 to open or close according to the pressure difference between the detection box 11 and the battery pack 12 under test. In addition, the industrial control computer 220 controls the gas flowing out of the battery pack 12 under test to enter the high negative pressure pipeline 710 or low negative pressure pipeline 720 of the monitoring pipeline assembly according to the pressure value in the battery pack 12 under test, thereby improving the accuracy of the detection results of the first detection element 210.

[0026] In other words, the first detection unit 210 can extract the volatile substances of the electrolyte into its interior for detection and feed the detection results back to the industrial control computer 220. The industrial control computer 220 then feeds the results back to the display unit 230 for display to the user, thereby realizing the intelligent display of the detection results. The second detection component 240 can detect the pressure difference between the battery pack 12 under test and the detection box 11, and feed the detection result back to the industrial control computer 220. The industrial control computer 220 then feeds back to the circulation pipeline assembly 400. When the pressure difference between the two is small, the first valve body 430 and the second valve body 440 are opened simultaneously, and the circulation pipeline assembly 400 is opened, allowing the battery pack 12 under test to enter the low-pressure differential gas circulation system. The flow of gas accelerates the evaporation and diffusion of the leaked electrolyte, shortens the waiting time, and improves the detection efficiency. When the pressure difference between the two is large, the second valve body 440 is opened and the first valve body 430 is closed simultaneously, and the circulation pipeline assembly 400 is closed, allowing the battery pack 12 under test to enter the normal detection system. The pressure difference between the detection box 11 and the battery pack 12 under test accelerates the evaporation and diffusion of the leaked electrolyte, improving the accuracy of the detection results. In addition, the second detection element 240 can also detect the pressure value inside the battery pack 12 under test and feed the detection result back to the industrial control computer 220. The industrial control computer 220 then feeds the result back to the detection pipeline assembly 700. When the detected pressure value is low, the fourth valve body 740 is opened and the third valve body 730 is closed to open the low negative pressure pipeline 720 and close the high negative pressure pipeline 710, so that the first detection element 210 enters the low negative pressure detection environment for testing. When the detected pressure value is high, the fourth valve body 740 is closed and the third valve body 730 is opened to close the low negative pressure pipeline 720 and open the high negative pressure pipeline 710, so that the first detection element 210 enters the high negative pressure detection environment for testing.

[0027] In one possible implementation, the airtightness testing device further includes a testing pipeline assembly 700, which is disposed between the first air port and the first testing element 210. The testing pipeline assembly 700 includes a high negative pressure pipeline 710, a low negative pressure pipeline 720, a third valve body 730, and a fourth valve body 740. The high negative pressure pipeline 710 connects the first air port and the first testing element 210, and the third valve body 730 is disposed in the high negative pressure pipeline 710. The low negative pressure pipeline 720 connects the first air port and the first testing element 210, and the fourth valve body 740 is disposed in the low negative pressure pipeline 720.

[0028] In this embodiment, by setting up a detection pipeline assembly 700, the airtightness testing device can perform both low negative pressure environment testing and high negative pressure environment testing, thus broadening its application scenarios and enhancing its versatility and universality. Specifically, the detection pipeline assembly 700 is configured as a combination of at least a high negative pressure pipeline 710, a low negative pressure pipeline 720, a third valve body 730, and a fourth valve body 740. The high negative pressure pipeline 710 can be a PU flexible tube, with its two ends connected to the first air port on the first suction component 300 and the first detection component 210, respectively. The high negative pressure pipeline 710 is equipped with the third valve body 730. The low negative pressure pipeline 720 can also be a PU flexible tube, with its two ends connected to the first air port on the first suction component 300 and the first detection component 210, respectively. The low negative pressure pipeline 720 is equipped with the fourth valve body 740. In other words, the third valve body 730 and the fourth valve body 740 are connected in parallel between the first suction component 300 and the first detection component 210. The third valve body 730 and / or the fourth valve body 740 can be a solenoid valve or a flow regulating valve. The third valve body 730 and the fourth valve body 740 can be electrically connected to the industrial control computer 220. In this way, after receiving and processing the data information transmitted from the second detection component 240, the industrial control computer 220 can control the third valve body 730 and the fourth valve body 740 to open or close, thereby realizing intelligent detection of the battery pack 12 under test, saving time and effort.

[0029] In one possible implementation, a support leg assembly 800 is also included, which is disposed below the housing 100 and inside the roller assembly 500. The roller assembly 500 is foldable within the housing 100; or, the support leg assembly 800 is foldable within the housing 100.

[0030] In this embodiment, the addition of a support leg assembly 800 strengthens the bottom support of the housing 100, improving the stability of the testing equipment and the reliability of the operating environment. The support leg assembly 800 includes four legs, each positioned at one of the four corners of the bottom of the housing 100, and located inside four casters. The roller assembly 500 is foldable; for example, it can be mounted on the bottom of the housing 100 via a rotating pivot. When the airtightness testing equipment needs to be moved, the roller assembly 500 is unfolded for easy movement; when the testing equipment is needed, it is folded up, relying solely on the support leg assembly 800 for support, reducing stress damage to the roller assembly 500 and extending its service life.

[0031] Alternatively, the support leg assembly 800 can be folded. For example, the support leg assembly 800 can be mounted on the bottom of the housing 100 via a rotating pivot. When the airtightness testing equipment needs to be moved, the support leg assembly 800 can be folded up for easy movement; and when the testing equipment needs to be used, the legs can be unfolded to increase the support force on the housing 100 and improve the stability of the testing equipment.

[0032] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0033] The above description is merely a specific embodiment of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. An airtightness testing device, characterized in that, include: The outer shell has a receiving cavity, and the outer shell is provided with an air inlet and an air outlet communicating with the receiving cavity. The air inlet is connected to the air outlet of the tooling to be tested, and the air outlet is connected to the air inlet of the tooling to be tested. A detection component is disposed in the receiving cavity; A first suction member is disposed in the receiving cavity. The first suction member includes a first air port, a second air port, and a third air port that communicate with each other. The first air port is connected to the detection component. A circulation pipe assembly is disposed in the receiving cavity and connects the air inlet to the second air port and connects the air outlet to the third air port; as well as The roller assembly is located below the housing.

2. The airtightness testing device according to claim 1, characterized in that, The circulating pipeline assembly includes an intake pipe, an exhaust pipe, a first valve body, and a second valve body. The exhaust pipe is located between the outlet port and the third port, and the first valve body is located in the exhaust pipe. The intake pipe is located between the inlet port and the second port, and the second valve body is located in the intake pipe.

3. The airtightness testing device according to claim 1, characterized in that, The detection assembly includes a first detection element and an industrial control computer. The first detection element is disposed in the receiving cavity and communicates with the first air port. The industrial control computer is disposed in the receiving cavity and is electrically connected to the first detection element.

4. The airtightness testing device according to claim 3, characterized in that, The detection component also includes a display unit, which is located above the housing and electrically connected to the industrial control computer.

5. The airtightness testing device according to claim 3, characterized in that, The detection assembly also includes a second detection element electrically connected to the industrial control computer. The second detection element is located inside the tooling to be tested and is used to detect the pressure inside the tooling to be tested.

6. The airtightness testing device according to claim 3, characterized in that, The airtightness testing equipment also includes a testing pipeline assembly, which is disposed between the first air inlet and the first testing element.

7. The airtightness testing device according to claim 6, characterized in that, The detection pipeline assembly includes a high negative pressure pipeline, a low negative pressure pipeline, a third valve body, and a fourth valve body. The high negative pressure pipeline connects the first air port and the first detection element, and the third valve body is located in the high negative pressure pipeline. The low negative pressure pipeline connects the first air port and the first detection element, and the fourth valve body is located in the low negative pressure pipeline.

8. The airtightness testing device according to claim 1, characterized in that, The testing fixture includes a testing box and a battery pack to be tested. The battery pack to be tested is located inside the testing box. The airtightness testing equipment also includes a second suction component, which is connected to the testing box and electrically connected to the testing component. The first suction component is connected to the inner cavity of the battery pack to be tested through the second air port and the third air port.

9. The airtightness testing device according to claim 1, characterized in that, It also includes a support leg assembly, which is located below the housing and inside the roller assembly.

10. The airtightness testing device according to claim 9, characterized in that, The roller assembly is foldable and disposed within the housing; Alternatively, the support leg assembly can be folded into the outer casing.

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