Air tightness detection device for battery pack

Abstract

The utility model discloses a battery pack airtightness detection device, and relates to the technical field of detection devices. The device specifically comprises a shell which can be arranged on an anti-explosion valve of a battery pack in a covering mode so that the anti-explosion valve can be isolated from the outside, and a via hole is formed in the top of the shell; the first end of the sliding pipe penetrates through the via hole in a sliding mode and extends into the shell. The sealing cover is connected to the first end of the sliding pipe, and when the sliding pipe drives the sealing cover to open the anti-explosion valve, the sealing cover inflates the shell; and the pressing assemblies are connected to the sealing cover, and after inflation is completed, the pressing assemblies are used for pressing the sealing cover to the anti-explosion valve and can adjust the pressure on the sealing cover. The utility model aims to prolong the service life of the existing quick-charging air tightness detection joint and reduce the maintenance cost.

Description

Technical Field

[0001] The utility model relates to the technical field of detection devices, and in particular to a battery pack airtightness detection device. Background Art

[0002] In recent years, with growing global environmental awareness and strong government support for energy conservation and emission reduction policies, the electric vehicle industry has experienced rapid growth. As a representative of green mobility, electric vehicles offer significant advantages in reducing greenhouse gas emissions and lowering reliance on fossil fuels, making them a key development direction for the future transportation industry. Among the core technologies of electric vehicles, the power battery system (Battery Pack) is a key component, typically consisting of multiple battery cells, a management system, and a battery housing.

[0003] To ensure the safety of the battery pack, it is necessary to ensure that the internal and external spaces of the battery pack are isolated from each other. If the battery pack is not airtight enough, external moisture, dust, pollutants in the air, etc. may enter the battery, causing a short circuit in the battery cell, and may even cause the battery to burn or explode.

[0004] To evaluate the airtightness of battery packs, airtightness testing technology is currently widely used. Due to the relatively large size of new energy batteries, airtightness testing requires sealing the battery pack connectors and finding a port on the pack to serve as an air filling port. This requires using a testing tool to seal the remaining ports. After sealing, compressed air can be injected into the battery pack housing through the pre-reserved air filling port. Testing equipment is then used to observe whether the battery pack's sealing performance meets the requirements.

[0005] A common method used in the industry for air tightness testing is to use a quick-fill air tightness test connector. This connector is connected to the pack safety valve, and then a sliding tube is pulled to draw air out of the safety valve and out the inflation port. The sliding tube is then rotated to secure it in the groove on the inner wall of the connection cover, where it is fixed before the air tightness test is performed. This method not only allows for a quick air tightness test, but also reduces damage to the battery pack itself, improving test efficiency.

[0006] However, when using the existing fast-charging air tightness detection connector, the sealing groove on the sealing cover is used to enhance the sealing of the connection with the battery pack to ensure more accurate results of the air tightness test, and the spring is used to apply elastic force to the sealing cover so that the sealing cover can fit well on the explosion-proof valve of the battery pack, thereby improving the tightness of the connection. However, after long-term use, the elastic force of the spring will gradually decay, resulting in the sealing cover and the explosion-proof valve of the battery pack no longer fitting tightly, which ultimately affects the accuracy of the air tightness test. When the elastic force of the spring is insufficient, it is difficult to simply adjust the spring due to the current structural design limitations, and users often need to replace the entire connector device, which not only increases the company's maintenance costs, but also shortens the service life of the connector.

[0007] Therefore, how to extend the service life of the existing quick-filling air tightness detection connector and reduce maintenance costs has become a technical problem that needs to be solved urgently. Utility Model Content

[0008] The main purpose of the utility model is to provide a battery pack air tightness detection device, aiming to extend the service life of the existing fast-charging air tightness detection connector and reduce maintenance costs.

[0009] In order to achieve the above objectives, the present invention provides a battery pack airtightness detection device, comprising:

[0010] The shell can be covered on the explosion-proof valve of the battery pack to isolate the explosion-proof valve from the outside world, and the top of the shell is provided with a through hole;

[0011] a sliding tube, a first end of which slides through the through hole and extends into the interior of the housing;

[0012] a sealing cover connected to the first end of the sliding pipe, wherein when the sliding pipe drives the sealing cover to open the explosion-proof valve, the sealing cover inflates air into the housing; and

[0013] At least one set of pressing components is connected to the sealing cover and is used to press the sealing cover onto the explosion-proof valve after inflation is completed, and the pressure on the sealing cover can be adjusted.

[0014] The compression assembly design allows for adjustable pressure on the sealing cover, adapting the device to varying operating conditions and increasing detection flexibility and reliability. Since the pressure can be adjusted, if pressure decays over time, it can be restored by re-adjusting the pressure, eliminating the need to replace the pressure assembly and extending the device's service life.

[0015] In one embodiment of the present application, the pressing assembly includes:

[0016] A vertical rod, a first end of which is connected to the top of the housing;

[0017] A compression spring is sleeved on the vertical rod, a limit block is provided at the second end of the vertical rod to limit the compression spring from falling, a first end of the compression spring abuts against the top of the housing, and a second end of the compression spring acts on the sealing cover to press the sealing cover against the explosion-proof valve; and

[0018] A compression nut is threadedly connected to the vertical rod and is located between the first end of the compression spring and the top of the shell body, and is used to adjust the pressure of the compression spring.

[0019] The compression nut design allows the compression spring pressure to be adjusted by rotating the nut. This allows users to adjust the sealing cover's pressure on the explosion-proof valve to suit different testing requirements, enhancing testing flexibility. The elastic force exerted by the compression spring ensures that the sealing cover maintains a stable seal against the explosion-proof valve, ensuring a secure seal that resists loosening. A stopper prevents the spring from slipping, further enhancing system reliability.

[0020] In one embodiment of the present application, a slider is slidably connected to the vertical rod, and the slider is located between the first end of the compression spring and the tightening nut.

[0021] The slider acts as a transitional component between the compression nut and the compression spring, eliminating friction and uneven localized pressure that might otherwise occur if the nut were to act directly on the spring. The slider smoothly transmits the nut's adjustment force, ensuring more even compression of the compression spring and a more stable spring force.

[0022] In one embodiment of the present application, a slide is connected to the sealing cover, a through hole is provided on the slide, the slide is slidably connected to the vertical rod through the through hole, and the slide is located between the second end of the compression spring and the limit block; wherein the diameter of the limit block is larger than the inner diameter of the through hole.

[0023] The slide is connected to the vertical rod by a sliding mechanism, allowing it to move freely up and down in response to the pressure of the compression spring. This sliding mechanism facilitates force transmission between the spring and the sealing cover, making installation and removal of the entire assembly easier. The diameter of the stopper is larger than the inner diameter of the slide's through hole, ensuring that the slide does not disengage from the vertical rod.

[0024] In one embodiment of the present application, a mounting ring is fixedly connected to the first end of the vertical rod, and the mounting ring is detachably connected to the top of the shell.

[0025] The mounting ring is detachably connected to the top of the housing, allowing for easy installation and removal of the vertical rod. This allows for quick replacement or repair of components in the event of a device failure or maintenance, improving maintenance efficiency.

[0026] In one embodiment of the present application, the slide plate is detachably connected to the sealing cover.

[0027] The detachable design allows the slide and seal cover to be quickly separated in the event of wear, damage, or failure, allowing for easy replacement of individual slide or seal cover components without having to replace the entire assembly. This reduces repair and maintenance complexity, improves efficiency, and reduces costs.

[0028] In one embodiment of the present application, the second end of the sliding tube is connected to a handle portion that can drive the sliding tube to telescopically move along the axial direction of the through hole.

[0029] By providing a handle at the second end of the slide tube, the operator can directly grasp and control the slide tube's telescopic movement, conveniently adjusting the position of the sealing cover. The handle simplifies the operation process, reduces the need for complex tools, and makes the operation more intuitive and labor-saving.

[0030] In one embodiment of the present application, a buckle portion that can be buckled onto both sides of the explosion-proof valve is provided at the bottom of the sealing cover.

[0031] The snap-fit ​​design allows the sealing cover to securely snap onto both sides of the explosion-proof valve, ensuring close contact between the sealing cover and the valve. This prevents it from loosening due to external vibrations or pressure changes, making it easy to open and close the battery pack's explosion-proof valve.

[0032] In one embodiment of the present application, a sealing rubber ring capable of abutting against an outer wall of the battery pack is further provided at the bottom of the sealing cover.

[0033] The sealing rubber ring can fit tightly against the outer wall of the battery pack, further preventing gas from leaking from the gap between the battery pack and the sealing cover, ensuring a more reliable sealing effect during air tightness testing.

[0034] In one embodiment of the present application, the air inlet of the slide tube is located on the side wall of the slide tube. This location prevents airflow from directly impacting the seal cover or explosion-proof valve from the end of the slide tube, reducing the impact on the sealed area. This effectively prevents airflow disturbances or leakage caused by airflow directly impacting the sealed area, maintains the stability of the sealed environment, and improves the accuracy of airtightness testing.

[0035] The aforementioned technical solution allows for adjustable pressure on the sealing cover, allowing the device to adapt to varying operating conditions and increasing detection flexibility and reliability. This adjustable pressure allows for pressure reduction over time, allowing for restoration by re-adjusting the pressure without replacing the pressure assembly, extending the device's service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] The present invention will be described in detail below with reference to specific embodiments and accompanying drawings, wherein:

[0037] Figure 1 This is a schematic structural diagram of the first embodiment of the present utility model;

[0038] 10. Housing; 11. Through hole; 20. Sliding tube; 31. Vertical rod; 32. Compression spring; 33. Pressing nut; 34. Slider; 35. Limit block; 36. Mounting ring; 41. Sealing cover; 42. Buckle part; 43. Slide plate; 50. Handle part; 60. Air inlet. DETAILED DESCRIPTION

[0039] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention is described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the following specific embodiments are only used to explain the present invention and do not constitute a limitation to the present invention.

[0040] like Figure 1 As shown, in order to achieve the above purpose, the present invention proposes a battery pack airtightness detection device, comprising:

[0041] The housing 10 can be mounted on the explosion-proof valve of the battery pack to isolate the explosion-proof valve from the outside world. A through hole 11 is provided on the top of the housing 10.

[0042] A sliding tube 20 , a first end of which slides through the through hole 11 and extends into the interior of the housing 10 ;

[0043] a sealing cover 41 connected to the first end of the slide tube 20 , and when the slide tube 20 drives the sealing cover 41 to open the explosion-proof valve, the sealing cover 41 inflates air into the housing 10 ; and

[0044] At least one set of pressing components is connected to the sealing cover 41 , and is used to press the sealing cover 41 onto the explosion-proof valve after inflation is completed, and the pressure on the sealing cover 41 can be adjusted.

[0045] Specifically, the present application provides a battery pack airtightness detection device comprising: a housing 10, a sliding tube 20, a sealing cover 41, and at least one set of clamping assemblies. The housing 10 is mounted on the explosion-proof valve of the battery pack, forming a relatively closed space. The main function of the housing 10 is to isolate the explosion-proof valve from the external environment to prevent external interference with the airtightness detection. The sliding tube 20 enters the interior of the housing 10 through a through hole 11 at the top of the housing 10. The sliding tube 20 can slide through the through hole 11, which allows the sliding tube 20 to move in the vertical direction and drive the sealing cover 41 to contact the explosion-proof valve. The first end of the sliding tube 20 is fixedly connected to the sealing cover 41. When the sliding tube 20 slides, the sealing cover 41 moves accordingly. After the sealing cover 41 contacts the explosion-proof valve, it drives the sliding tube 20 away from the explosion-proof valve, thereby opening the explosion-proof valve. After the explosion-proof valve is opened, the battery pack is inflated through the opening of the explosion-proof valve to achieve airtightness detection. The clamping assembly is connected to the sealing cover 41. Once inflation is complete, the compression assembly securely presses the sealing cover 41 against the explosion-proof valve, ensuring a tight seal. The degree of compression can be adjusted by adjusting the pressure. If the compression assembly is a spring, the spring's tightness can be adjusted; if the compression assembly is a telescopic cylinder, the pressure between the telescopic cylinder and the explosion-proof valve can be adjusted. The present application includes two sets of compression assemblies, which are relatively evenly distributed on either side of the sealing cover 41.

[0046] With this technical solution, the compression assembly design allows for adjustable pressure on the sealing cover 41, allowing the device to adapt to different operating conditions and increasing detection flexibility and reliability. Since the pressure can be adjusted, if pressure decays over time, it can be restored by re-adjusting the pressure, eliminating the need to replace the pressure assembly and extending the device's service life.

[0047] In one embodiment of the present application, the pressing assembly includes:

[0048] A vertical rod 31, the first end of which is connected to the top of the housing 10;

[0049] A compression spring 32 is sleeved on the vertical rod 31. A stop block 35 is provided at the second end of the vertical rod 31 to prevent the compression spring 32 from falling. The first end of the compression spring 32 abuts against the top of the housing 10. The second end of the compression spring 32 acts on the sealing cover 41 to press the sealing cover 41 against the explosion-proof valve.

[0050] The compression nut 33 is threadedly connected to the vertical rod 31 and is located between the first end of the compression spring 32 and the top of the housing 10 , and is used to adjust the pressure of the compression spring 32 .

[0051] Specifically, the first end of vertical rod 31 is connected to the top of the interior of housing 10, providing a secure connection. Vertical rod 31 provides support and guidance for compression spring 32 and compression nut 33. Vertical rod 31 is fixed to the top of housing 10, ensuring the stable operation of the entire compression assembly within housing 10.

[0052] Compression spring 32 is mounted on vertical rod 31. Its primary function is to apply pressure to sealing cover 41 through elastic deformation, thereby pressing sealing cover 41 against the explosion-proof valve and ensuring a tight seal. The first end of compression spring 32 abuts the top of housing 10, while the second end acts on sealing cover 41. The spring's elastic force compresses sealing cover 41.

[0053] The limit block 35 is provided at the second end of the vertical rod 31, and its main function is to prevent the compression spring 32 from sliding off the vertical rod 31, ensuring that the spring remains in its designed position and ensuring the normal operation of the assembly. The limit block 35 provides a position limit for the spring to prevent the spring from falling off due to loosening or vibration during operation. The clamping nut 33 is threadedly connected to the vertical rod 31 and is located between the first end of the compression spring 32 and the top of the shell 10. Its main function is to change the compression amount of the compression spring 32 by rotating the position of the adjustment nut, thereby adjusting the pressure applied by the spring to the sealing cover 41. The clamping nut 33 allows the pressure to be adjusted, ensuring flexible pressure adjustment, so that the device can adapt to different detection requirements. At the same time, as time goes by, when the pressure of the spring becomes abnormal, pressure compensation can be provided by adjusting the position of the clamping nut 33.

[0054] With this technical solution, the design of the compression nut 33 allows the pressure of the compression spring 32 to be adjusted by rotating the nut. This allows the user to adjust the pressure of the sealing cover 41 on the explosion-proof valve according to different testing requirements, improving testing flexibility. The elastic force exerted by the compression spring 32 ensures that the sealing cover 41 is continuously and stably pressed against the explosion-proof valve, ensuring a stable seal and preventing loosening. The limit block 35 prevents the spring from slipping, further ensuring system reliability.

[0055] In one embodiment of the present application, a slider 34 is slidably connected to the vertical rod 31 , and the slider 34 is located between the first end of the compression spring 32 and the compression nut 33 .

[0056] Specifically, the slider 34 is slidably connected to the vertical rod 31 and is located between the first end of the compression spring 32 and the clamping nut 33. It is used to transmit the pressure from the clamping nut 33 to the compression spring 32. The slider 34 can slide along the vertical rod 31, and the vertical rod 31 provides a guide for the slider 34 to ensure that the slider 34 can move stably on the vertical rod 31. The slider 34 is between the clamping nut 33 and the compression spring 32, serving as an intermediate medium for pressure transmission. The lower end of the slider 34 contacts the first end of the compression spring 32. The adjustment pressure from the clamping nut 33 is transmitted through the slider 34, causing the compression spring 32 to be compressed or released, thereby adjusting the force it applies to the sealing cover 41. The clamping nut 33 is located above the slider 34. By rotating the clamping nut 33, the slider 34 slides on the vertical rod 31 and transmits the pressure to the compression spring 32 through the slider 34, thereby adjusting the compression force of the spring.

[0057] With this technical solution, slider 34 acts as a transitional component between compression nut 33 and compression spring 32, eliminating friction and uneven localized pressure that might otherwise result from the nut directly acting on the spring. Slider 34 smoothly transmits the nut's adjustment force, ensuring more uniform compression of compression spring 32 and a more stable spring force.

[0058] In one embodiment of the present application, a slide plate 43 is connected to the sealing cover 41, and a through hole is provided on the slide plate 43. The slide plate 43 is slidably connected to the vertical rod 31 through the through hole, and the slide plate 43 is located between the second end of the compression spring 32 and the limit block 35; wherein the diameter of the limit block 35 is larger than the inner diameter of the through hole.

[0059] Specifically, the slide plate 43 is provided with a through hole, through which it is slidably connected to the vertical rod 31. The slide plate 43 is located between the second end of the compression spring 32 and the limit block 35. The slide plate 43 makes the movement of the sealing cover 41 more stable and ensures that the sealing cover 41 can maintain contact with the explosion-proof valve under the action of appropriate force.

[0060] The slide 43 is connected to the sealing cover 41, and its movement directly drives the sealing cover 41 up and down. As the slide 43 slides, the sealing cover 41 is pressed against the explosion-proof valve by the compression spring 32. The slide 43 is slidably connected to the vertical rod 31 via a through hole in the slide 43, allowing the slide 43 to slide up and down along the vertical rod 31. As the slide 43 slides on the vertical rod 31, it transmits the pressure applied by the compression spring 32 to the sealing cover 41. The slide 43 is located at the second end of the compression spring 32, bearing the downward pressure from the spring. When the compression spring 32 is compressed, the slide 43 moves downward, transmitting force to the sealing cover 41, thereby sealing the explosion-proof valve. The slide 43 slides on the vertical rod 31, but because the diameter of the stop block 35 is larger than the inner diameter of the through hole in the slide 43, the slide 43 cannot pass the stop block 35, thus limiting its downward range. This design ensures that the slide 43 moves within a certain range, preventing excessive movement that could cause structural failure or component loss.

[0061] Using this technical solution, a sliding connection is provided between the slide plate 43 and the vertical rod 31, allowing the slide plate 43 to freely move up and down in response to the pressure of the compression spring 32. This sliding structure facilitates force transmission between the spring and the sealing cover 41, facilitating installation and removal of the entire assembly. The diameter of the stopper 35 is larger than the inner diameter of the through hole of the slide plate 43, ensuring that the slide plate 43 does not disengage from the vertical rod 31.

[0062] In one embodiment of the present application, a mounting ring 36 is fixedly connected to the first end of the vertical rod 31 , and the mounting ring 36 is detachably connected to the top of the housing 10 .

[0063] Specifically, the mounting ring 36 is fixedly connected to the first end of the vertical rod 31 , and the mounting ring 36 is detachably connected to the inner top of the housing 10 , providing convenience for maintenance or replacement.

[0064] With the above technical solution, the mounting ring 36 is detachably connected to the top of the housing 10, allowing the vertical rod 31 to be easily installed or removed. This allows the relevant components to be quickly replaced or repaired when the equipment fails or requires maintenance, thereby improving the maintenance efficiency of the equipment.

[0065] In one embodiment of the present application, the slide plate 43 is detachably connected to the sealing cover 41 .

[0066] The detachable design of the above-mentioned technical solution allows the slide plate 43 and the sealing cover 41 to be quickly separated in the event of wear, damage, or failure, making it easy to replace the slide plate 43 or sealing cover 41 components separately without having to replace the entire assembly. This reduces the complexity of repair and maintenance, improves maintenance efficiency, and reduces maintenance costs.

[0067] In one embodiment of the present application, the second end of the sliding tube 20 is connected to a handle portion 50 that can drive the sliding tube 20 to telescopically move along the axial direction of the through hole 11 .

[0068] By adopting the above technical solution, by providing a handle at the second end of the slide tube 20, the operator can directly grasp and control the telescopic movement of the slide tube 20, conveniently adjusting the position of the sealing cover 41. The handle simplifies the operation process, reduces the need for complex tools, and makes the operation more intuitive and labor-saving.

[0069] In one embodiment of the present application, a buckle portion 42 is provided at the bottom of the sealing cover 41 and can be buckled onto both sides of the explosion-proof valve.

[0070] With the above technical solution, the buckle portion 42 design allows the sealing cover 41 to be securely fastened to both sides of the explosion-proof valve, ensuring close contact between the sealing cover 41 and the explosion-proof valve and preventing it from loosening due to external vibrations or pressure changes. This facilitates opening and closing the battery pack's explosion-proof valve.

[0071] In one embodiment of the present application, a sealing rubber ring is further provided at the bottom of the sealing cover 41 and can abut against the outer wall of the battery pack.

[0072] By adopting the above technical solution, the sealing rubber ring can fit tightly against the outer wall of the battery pack, further preventing gas from leaking from the gap between the battery pack and the sealing cover 41, and ensuring a more reliable sealing effect during airtightness testing.

[0073] In one embodiment of the present application, the air inlet 60 of the sliding tube 20 is located on a side wall of the sliding tube 20 .

[0074] With this technical solution, the air inlet 60 is located on the sidewall of the slide tube 20, preventing airflow from flowing directly from the end of the slide tube 20 toward the sealing cover 41 or explosion-proof valve, thereby reducing the impact on the sealed area. This effectively prevents airflow disturbances or leakage caused by airflow directly impacting the sealed area, maintains the stability of the sealed environment, and improves the accuracy of airtightness testing.

[0075] The above description is only a preferred embodiment of the present invention and does not limit the patent scope of the present invention. All equivalent structural transformations made by using the contents of the present invention specification and drawings under the utility model concept, or direct / indirect application in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A battery pack airtightness detection device, characterized in that: include: The shell can be covered on the explosion-proof valve of the battery pack to isolate the explosion-proof valve from the outside world, and the top of the shell is provided with a through hole; a sliding tube, a first end of which slides through the through hole and extends into the interior of the housing; a sealing cover connected to the first end of the sliding pipe, wherein when the sliding pipe drives the sealing cover to open the explosion-proof valve, the sealing cover inflates air into the housing; and At least one set of pressing components is connected to the sealing cover and is used to press the sealing cover onto the explosion-proof valve after inflation is completed, and the pressure on the sealing cover can be adjusted.

2. The battery pack airtightness detection device according to claim 1, wherein: The pressing assembly comprises: A vertical rod, a first end of which is connected to the top of the housing; A compression spring is sleeved on the vertical rod, a limit block is provided at the second end of the vertical rod to limit the compression spring from falling, a first end of the compression spring abuts against the top of the housing, and a second end of the compression spring acts on the sealing cover to press the sealing cover against the explosion-proof valve; and A compression nut is threadedly connected to the vertical rod and is located between the first end of the compression spring and the top of the shell body, and is used to adjust the pressure of the compression spring.

3. The battery pack airtightness detection device according to claim 2, wherein: A sliding block is slidably connected to the vertical rod, and the sliding block is located between the first end of the compression spring and the pressing nut.

4. The battery pack airtightness detection device according to claim 2 or 3, characterized in that: The sealing cover is connected to a slide plate, which is provided with a through hole. The slide plate is slidably connected to the vertical rod through the through hole. The slide plate is located between the second end of the compression spring and the limit block; wherein the diameter of the limit block is larger than the inner diameter of the through hole.

5. The battery pack airtightness detection device according to claim 2, wherein: A mounting ring is fixedly connected to the first end of the vertical rod, and the mounting ring is detachably connected to the top of the shell.

6. The battery pack airtightness detection device according to claim 4, wherein: The slide plate is detachably connected to the sealing cover.

7. The battery pack airtightness detection device according to claim 1, wherein: The second end of the sliding tube is connected to a handle portion which can drive the sliding tube to telescopically move along the axial direction of the through hole.

8. The battery pack airtightness detection device according to claim 1, wherein: The bottom of the sealing cover is provided with buckle parts which can be buckled on both sides of the explosion-proof valve.

9. The battery pack airtightness detection device according to claim 1, wherein: The bottom of the sealing cover is also provided with a sealing rubber ring that can abut against the outer wall of the battery pack.

10. The battery pack airtightness detection device according to claim 1, wherein: The air inlet of the sliding tube is located on the side wall of the sliding tube.

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