Air tightness test auxiliary tool

Abstract

The invention relates to the technical field of battery pack air tightness detection, and provides an air tightness test auxiliary tool which comprises a tool shell, a containing cavity, a first sealing gasket and an interface. The tool shell is used for being connected to the outer side of a panel of a battery pack shell in an attached mode. The accommodating cavity is formed in the tool shell and is used for accommodating a pipe nozzle at the end part of a liquid cooling pipe in a battery pack; the first sealing gasket is arranged on the inner side of the tool shell, the first sealing gasket surrounds an airtightness detection area on a panel of the battery pack shell to form a sealing area, and the sealing area is communicated with the containing cavity; and the interface is used for communicating the accommodating cavity and the airtightness detection equipment. According to the invention, the tool shell is connected with the outer side of the panel in an attached manner, and the first sealing gasket is used for sealing the airtight detection area in a surrounding manner, so that the sealing parts (such as the sealing parts or colloid) between the nozzles at the two ends of the liquid cooling pipe and the panel are completely isolated in the sealing area, and the interference of the external environment is avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of airtightness detection of battery packs, and particularly relates to an auxiliary tooling for airtightness testing. Background Art

[0002] In the field of new energy vehicles, as the core energy storage unit, the lithium battery PACK (battery pack) requires strict waterproof design for its safety. Since the vehicle may encounter situations such as rainwater infiltration, cleaning fluid penetration, or high-pressure water gun washing during operation, if water enters the PACK internally, it may lead to short circuits, thermal runaway, or even fire and explosion. Therefore, waterproof design is one of the key links to ensure the safe operation of the battery system.

[0003] Currently, as a core component of the PACK thermal management system, the liquid cooling pipe is usually fixed to the housing by means of buckles, bolts, etc. The sealing protection between it and the housing mainly relies on the sealing part installed manually. The function of this sealing part is to fill the microscopic gap between the liquid cooling pipe and the housing, form a physical barrier layer, and prevent external moisture from infiltrating into the battery pack through the installation gap. However, in actual production, there are significant defects in the installation process of the sealing part: firstly, manual operation is prone to cause missing installation or deviation, resulting in local sealing failure; secondly, the integrity of the foam may be damaged due to extrusion, scratching, etc. during the installation process, reducing the sealing performance. The above problems directly lead to the need for rework in subsequent processes, which not only increases production costs but also may delay the delivery cycle due to rework. More seriously, the PACK with ineffective sealing has a potential risk of water ingress during vehicle use, which may cause battery system failures and even lead to safety accidents, threatening the life and property safety of users. Summary of the Invention

[0004] In view of the above-mentioned disadvantages of the prior art, the purpose of the present invention is to provide an auxiliary tooling for airtightness testing to be able to detect the airtightness between the liquid cooling pipe and the housing of the battery pack.

[0005] To achieve the above purpose and other related purposes, the present invention provides an auxiliary tooling for airtightness testing, including:

[0006] A tooling housing for fitting and connecting to the outer side of the panel of the battery pack housing;

[0007] A receiving cavity provided in the tooling housing for receiving the nozzle at the end of the liquid cooling pipe in the battery pack;

[0008] A first sealing gasket provided on the inner side of the tooling housing, the first sealing gasket surrounding the airtightness detection area on the panel of the battery pack housing to form a sealing area, and the sealing area is communicated with the receiving cavity;

[0009] An interface for communicating the receiving cavity and the airtightness detection device.

[0010] In an alternative embodiment of the present invention, the accommodation cavity includes a first cavity for accommodating the liquid inlet nozzle of the liquid cooling pipe and a second cavity for accommodating the liquid outlet nozzle of the liquid cooling pipe, and both the first cavity and the second cavity communicate with the sealing area.

[0011] In an alternative embodiment of the present invention, the interface is communicatively disposed in the first cavity, and a second sealing gasket is disposed inside the second cavity, and the second sealing gasket is used to block the liquid outlet nozzle.

[0012] In an alternative embodiment of the present invention, the sealing portion is connected to the panel through a plurality of threaded holes, and at least one first through hole for a connecting screw to pass through is provided on the tooling housing, and the position of the first through hole corresponds to the position of the threaded hole on the sealing portion between the nozzle and the panel.

[0013] In an alternative embodiment of the present invention, a third sealing gasket is circumferentially disposed around the first through hole, and the third sealing gasket is located inside the tooling housing.

[0014] In an alternative embodiment of the present invention, the third sealing gasket and the first sealing gasket are integrally formed.

[0015] In an alternative embodiment of the present invention, one first through hole is correspondingly provided for each of the two sealing portions.

[0016] In an alternative embodiment of the present invention, the two first through holes are arranged in a staggered manner in the first direction.

[0017] In an alternative embodiment of the present invention, the first through hole is located at a position in the middle in the second direction close to the sealing area.

[0018] In an alternative embodiment of the present invention, the tooling housing includes an extension portion, the extension portion extends to an area on the panel having a mounting hole, and a second through hole is provided on the extension portion, and the position of the second through hole corresponds to the position of the mounting hole.

[0019] The technical effect of the present invention is as follows: Through the fitting connection between the tooling housing and the outer side of the panel, combined with the circumferential sealing of the airtight detection area by the first sealing gasket, the sealing portions (such as sealing portions or colloids) between the two ends of the liquid cooling pipe and the panel are completely isolated in the sealing area, avoiding interference from the external environment. And through the interface, it is quickly connected to the airtight detection equipment (such as differential pressure sensors, flow meters, etc.) to realize the injection of the airtight detection medium and the efficient acquisition of the pressure / flow rate change. Traditional manual detection relies on the operator's experience to judge the sealing performance, and it is easy to cause misdetection or missed detection due to missing installation, damage or installation deviation of the sealing gasket. This tooling reduces the human intervention link through the mechanized sealing area isolation and standardized gas path connection, effectively avoiding the detection deviation caused by human operation errors and reducing the rework and repair cost. Brief Description of the Drawings

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for describing the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0021] Figure 1 It is a schematic structural diagram of the panel and liquid cooling pipe of the battery pack in the prior art;

[0022] Figure 2 It is an installation schematic diagram of the airtightness test auxiliary tooling in an embodiment of the present invention;

[0023] Figure 3 It is an external structural schematic diagram of the airtightness test auxiliary tooling in an embodiment of the present invention;

[0024] Figure 4 It is an internal structural schematic diagram of the airtightness test auxiliary tooling in an embodiment of the present invention.

[0025] Description of the reference numerals: 1, inlet nozzle; 2, outlet nozzle; 3, panel; 4, sealing part; 5, threaded hole; 10, tooling housing; 11, first through hole; 12, second through hole; 13, extension part; 20, first sealing gasket; 21, third sealing gasket; 30, interface; 40, first pipe cavity; 50, second pipe cavity; 51, second sealing gasket. Detailed Embodiments

[0026] The following specific examples illustrate the embodiments of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments. Various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that, without conflict, the following embodiments and the features in the embodiments can be combined with each other.

[0027] It should be noted that the drawings provided in the following embodiments only illustrate the basic concept of the present invention in a schematic manner. Therefore, only the components related to the present invention are shown in the drawings, rather than being drawn according to the number, shape, and size of the components in actual implementation. The type, quantity, and ratio of each component in actual implementation can be arbitrarily changed, and the component layout type may also be more complex.

[0028] In the field of new energy vehicles, as the core component of the power system, the safety and reliability of the lithium battery PACK (battery pack) are directly related to the operating performance of the whole vehicle and the safety of users. Since the vehicle may face complex working conditions such as rain washing, wading driving or high-pressure cleaning during actual use, the waterproof design of the battery pack has become a key link to ensure the safety of its internal electrical components and battery cells. If external moisture penetrates into the battery pack through the connection parts such as the housing and the liquid cooling pipe, it may cause serious safety hazards such as short circuit, insulation failure and even thermal runaway.

[0029] At present, as an important part of the battery pack thermal management system, the liquid cooling pipe is usually fixed on the surface of the housing by bolts or buckles. To isolate the moisture penetration in the installation gap between the liquid cooling pipe and the housing, a sealing part is generally used as the sealing medium in the industry. The sealing part is pre-installed in the contact area between the liquid cooling pipe and the housing, and fills the microscopic gaps through compression deformation to form a physical barrier layer to prevent liquid intrusion. However, in the actual production process, there are significant defects in the installation process of the sealing part:

[0030] High dependence on manual operation: The cutting, positioning and installation of the sealing part highly depend on manual operation, and problems such as missing installation, offset or folding are likely to occur due to the negligence or skill differences of the operator, resulting in local sealing failure;

[0031] Vulnerability during installation process: The foam material is soft and vulnerable to mechanical damage (such as extrusion deformation, edge tearing). If the force is not properly controlled or the tool contacts during manual installation, its integrity may be directly damaged, reducing the sealing performance;

[0032] Difficulty in quality traceability: The traditional assembly process lacks real-time detection means, and sealing defects are often detected only during subsequent airtightness tests or final quality inspections, resulting in a large number of semi-finished products being reworked or even the whole package being disassembled, greatly increasing the production cost and cycle.

[0033] To solve the above technical problems, the present invention provides an airtightness test auxiliary tooling, which is applied to the battery pack, as Figure 1 shown. The battery pack includes a housing and a liquid cooling pipe. The housing includes a panel 3. The inlet nozzle 1 and the outlet nozzle 2 at both ends of the liquid cooling pipe pass through the panel 3 and are exposed outside the housing. A sealing part 4 is arranged between the inlet nozzle 1 and the outlet nozzle 2 and the panel 3. The areas where the two sealing parts 4 are located are airtight detection areas.

[0034] As Figures 2 to 4 shown, the airtightness test auxiliary tooling includes a tooling housing 10, a receiving cavity, a first sealing gasket 20 and an interface 30.

[0035] The tooling housing 10 is used to fit and connect to the outer side of the panel 3. The tooling housing 10 is of a rigid or semi-rigid structure, and the shape of its inner side matches the outer contour of the battery pack panel 3. It is closely attached to the panel 3 by means of bolts, buckles or vacuum adsorption, etc., to ensure the positioning accuracy between the tooling and the battery pack. Here, the inner side of the tooling housing 10 refers to the side close to the housing, and the outer side refers to the side far from the housing.

[0036] The accommodation cavity is arranged in the tooling housing 10, and the accommodation cavity is used to accommodate the liquid inlet nozzle 1 and the liquid outlet nozzle 2. The accommodation cavity is a cavity structure designed inside the tooling housing 10, and its size and layout are adapted to the protruding lengths and spatial distributions of the liquid inlet nozzle 1 and the liquid outlet nozzle 2 at both ends of the liquid cooling pipe, and the two nozzles are completely wrapped inside. The nozzles to be measured are centrally accommodated to avoid interference from external airflows; a closed air path is formed by communicating with the interface 30 to ensure the directional flow of the airtight detection medium (such as compressed air), and the detection process is simplified.

[0037] The first gasket 20 is arranged on the inner side of the tooling housing 10. The first gasket 20 surrounds the airtight detection area to form a sealed area, and the sealed area communicates with the accommodation cavity. The sealed area is surrounded by the panel 3, the tooling housing 10 and the first gasket 20. The first gasket 20 is made of an elastic material (such as silica gel, rubber), fixed on the inner side of the tooling housing 10, surrounds the airtight detection area (i.e., the area where the sealing part 4 is located) on the panel 3, and forms a closed annular sealing belt. The microscopic gaps between the tooling housing 10 and the panel 3 are filled by compression deformation to isolate the external environment from the airtight detection area, ensuring that only the target sealing part 4 is analyzed for leakage during the detection process and excluding interference from non-related areas. The thickness of the first gasket 20 is designed to be 5 mm, which is the compressible thickness under force.

[0038] The interface 30 is used to connect the accommodation cavity and the airtight detection device. One end of the interface 30 is connected to the accommodation cavity, and the other end is connected to an external airtight detection device (such as an air pump, a barometer or a flow sensor), which is used to fill the accommodation cavity with the detection gas and monitor the pressure or flow rate changes in real time. It realizes the rapid injection of the airtight detection medium and data feedback, supports the automated detection process; through the standardized interface design, it is compatible with a variety of detection devices and improves the tooling compatibility.

[0039] During the detection process, only low-pressure gas (such as 0.5 - 1.5 bar) needs to be injected, without applying mechanical external force or high-temperature conditions, avoiding damage to the sealing part 4 or the colloid, and ensuring the integrity of the battery pack's performance at the time of leaving the factory. High-sensitivity airtight detection equipment (such as a differential pressure sensor) can identify leaks at the micron level, accurately expose hidden defects such as installation offset, local damage, or poor colloid curing of the sealing part 4, prevent unqualified products from flowing into subsequent processes, and reduce the rework cost. Through structural optimization and function integration, this airtightness test auxiliary tooling realizes the efficient, accurate, and non-destructive detection of the liquid-cooling tube sealing part 4 of the battery pack, solves the pain points of traditional detection methods such as low efficiency, large error, and poor adaptability, provides technical guarantee for the reliability of the battery pack's waterproof sealing performance, and significantly reduces the production cost and quality risk at the same time.

[0040] As Figures 2 to 4 shown, the accommodating cavity includes a first cavity 40 for accommodating the liquid inlet nozzle 1 and a second cavity 50 for accommodating the liquid outlet nozzle 2. Both the first cavity 40 and the second cavity 50 communicate with the sealing area. The accommodating cavity is designed as an independent first cavity 40 and second cavity 50, corresponding to the liquid inlet nozzle 1 and the liquid outlet nozzle 2 of the liquid-cooling tube respectively. The two cavities are separated inside the tooling housing 10 but both communicate with the sealing area (the annular area formed by the first sealing gasket 20), so that the airtight detection medium (such as compressed air) can cover the sealing parts 4 between the two nozzles and the panel 3 simultaneously from the sealing area. If a leak is detected, by analyzing the pressure changes in the first cavity 40 and the second cavity 50 respectively (such as sectional testing), the specific leak point (the sealing part 4 corresponding to the liquid inlet nozzle 1 or the liquid outlet nozzle 2) can be quickly located, simplifying the troubleshooting process. The direct cooperation between the cavity and the nozzle (such as interference fit or guiding inclined plane design) ensures the quick and accurate alignment of the tooling and the nozzle, eliminating the operation step of manual adjustment of the offset. It avoids uneven pressing of the first sealing gasket 20 or incomplete coverage of the sealing area caused by nozzle misalignment, improving the sealing reliability. The operator only needs to fit the tooling to the panel 3, and the cavity automatically guides the nozzle to complete the positioning, reducing the dependence on the operator's skills and avoiding sealing failure or false detection caused by manual alignment deviation.

[0041] As Figures 2 to 4As shown, the interface 30 is communicatively connected to the first lumen 40. A second gasket 51 is provided inside the second lumen 50, and the second gasket 51 is used to block the liquid outlet nozzle 2. By adding a second gasket 51 inside the second lumen 50, which is made of the same material as the first gasket 20 (such as silicone or rubber), it is used to block the opening of the liquid outlet nozzle 2 and prevent the airtight detection medium from escaping from the inside of the liquid outlet nozzle 2. At this time, the interface 30 only needs to be communicatively connected to the first lumen 40. The airtight detection medium is injected into the sealed area through the first lumen 40, and the second gasket 51 is used to seal the end of the liquid outlet nozzle 2 to form a one-way detection gas path. By blocking the liquid outlet nozzle 2 with the second gasket 51, there is no need to additionally provide an interface 30 or a valve in the second lumen 50, reducing the gas path connection points and lowering the complexity of the tooling and the leakage risk. The airtight detection medium only enters the sealed area from the first lumen 40, and the liquid outlet nozzle 2 is physically blocked, forcing the detection gas to act completely on the sealing part 4 area, avoiding pressure fluctuations caused by the internal cavity of the liquid cooling pipe (such as an unsealed nozzle), and improving the detection sensitivity. The thickness of the second gasket 510 is designed to be 5 mm, which is the compressible thickness under force.

[0042] As Figure 2 As shown, the sealing part 4 is connected to the panel 3 through a plurality of threaded holes 5. At least one first through hole 11 for a connecting screw to pass through is provided on the tooling housing 10, and the position of the first through hole 11 corresponds to that of the threaded hole 5. The sealing part 4 is fixed to the battery pack panel 3 through a plurality of threaded holes 5, and the tooling housing 10 is provided with corresponding first through holes 11 at the corresponding positions. During installation, the connecting screw passes through the first through hole 11 and is screwed into the threaded hole 5 to achieve the mechanical fixation of the tooling housing 10 and the panel 3. The screw connection provides rigid fixation, preventing the tooling from shifting due to air pressure impact or vibration during the test, and ensuring uniform pressing of the sealed area. The standardized threaded connection simplifies the tooling installation process, adapts to automated tools (such as an electric screwdriver), and improves the detection rhythm.

[0043] As Figure 4 As shown, a third gasket 21 is circumferentially provided around the first through hole 11, and the third gasket 21 is located inside the tooling housing 10. An annular third gasket 21 is added around the first through hole 11 inside the tooling housing 10 to fill the gap between the screw and the first through hole 11. The third gasket 21 isolates the detection gas from escaping through the screw hole, avoiding false leakage judgments caused by the thread gap. The elastic gasket compensates for the assembly tolerance between the screw and the through hole, reducing the requirement for machining accuracy. The designed thickness of the third gasket 21 is 5 mm, which is the compressible thickness under force.

[0044] As Figure 4As shown, the third gasket 21 and the first gasket 20 are integrally formed. The third gasket 21 and the first gasket 20 are integrally formed by using the same elastic material (such as silicone) through a mold to form a continuous sealing structure. This eliminates the risk of joint leakage of the split gasket and improves the overall sealing reliability. It reduces the installation steps of the independent gasket and lowers the error rate of manual operation.

[0045] As Figure 3 , 4 shown, one first through-hole 11 is correspondingly provided for each of the two sealing parts 4. One first through-hole 11 is correspondingly provided for each of the two sealing parts 4 (a total of two) to ensure the independent fixation of each sealing part 4. The independent screw fixation evenly distributes the pressing force of the two sealing parts 4 and avoids the deformation and failure of the gasket caused by single-point overpressure.

[0046] As Figure 3 , 4 shown, the two first through-holes 11 are arranged in a staggered manner in the first direction. The two first through-holes 11 are staggered by a certain distance along the width direction (the first direction) of the sealing area to avoid the screws being concentrated on the same axis. The staggered layout reduces the local stress concentration of the tooling housing 10 and prevents the deformation of the tooling housing 10 or the excessive compression of the sealing foam. For an asymmetric sealing area (such as a curved or broken-line contour), the staggered through-holes can optimize the stress direction of the screws.

[0047] As Figure 3 , 4 shown, the first through-hole 11 is located at the middle position in the second direction close to the sealing area. The first through-hole 11 is arranged in the middle area in the length direction (the second direction) of the sealing area, close to the geometric center of the sealing area. The locking force applied by the middle screw is evenly transmitted to both sides, ensuring that the gasket is uniformly pressed in the whole circumference and avoiding edge warping and leakage. The single-screw centered fixation can replace the multi-screw layout, simplify the tooling structure and reduce the cost.

[0048] As Figure 2 shown, the tooling housing 10 includes an extension part 13. The extension part 13 extends to the area on the panel 3 with mounting holes. A second through-hole 12 is provided on the extension part 13, and the position of the second through-hole 12 corresponds to that of the mounting hole. The tooling housing 10 is provided with an additional extension part 13 that covers other functional areas on the panel 3 (such as the battery pack lifting hole or the sensor mounting hole). The second through-hole 12 provided on the extension part 13 is aligned with the mounting hole on the panel 3 and is fixed by additional screws. The extension part 13 provides multi-point fixation, reduces the deformation of the tooling caused by the cantilever structure, and is especially suitable for large battery packs. The extension part 13 can integrate other detection interfaces (such as electrical contacts or sensors) to expand the detection function of the tooling (such as electrical performance testing).

[0049] The steps of the above airtightness test auxiliary tooling corresponding to the airtightness test method are as follows:

[0050] Step 1:

[0051] Take the semi-finished battery pack with the liquid cooling pipe and the housing assembled, ensuring that the sealing part 4 (such as the sealing foam) has been installed, but the corresponding tooling fixing screws (i.e., the screws for the threaded holes 5 connecting the sealing part 4 and the panel 3) are not installed temporarily.

[0052] In the assembly process, the sealing foam is pre-installed between the liquid cooling pipe and the panel 3 by manual or robotic arm, but the fixing screws are left empty to reserve a channel for subsequent tooling installation.

[0053] Avoid screw interference with tooling positioning and provide conditions for subsequent synchronous tightening through the tooling through holes.

[0054] Step 2:

[0055] Attach the tooling housing 10 to the outside of the panel 3, insert the connecting screws through the first through hole 11 (corresponding to the threaded hole 5 of the sealing part 4) and the second through hole 12 (installation hole of the extension part 13), and use an electric screwdriver to tighten the tooling.

[0056] The tooling housing 10 and the panel 3 are automatically centered by the mechanical limit of the pipe cavity and the nozzle, and the positions of the first through hole 11 and the threaded hole 5 are accurately matched.

[0057] All screw counterbores are designed identically, the electric screwdriver bit does not need to be replaced, and multi-point locking can be completed in a single operation (for example, locking 4 screws within 4 seconds).

[0058] Reinforcement of the extension part 13: Align the second through hole 12 of the extension part 13 with other installation holes of the panel 3 to increase the stability of the tooling and prevent shaking during testing.

[0059] Step 3:

[0060] After the tooling is fixed, the first gasket 20 (surrounding the sealing area) and the third gasket 21 (covering the screw holes) are compressed and fitted to the panel 3 to form a continuous sealing band; the second gasket 51 seals the end of the liquid outlet nozzle 2.

[0061] The rigid structure of the tooling housing 10 presses the gasket into the microscopic gaps through the screw locking force. The first gasket 20 isolates the detection area, and the third gasket 21 seals the screw holes. The second gasket 51 is tightly attached to the opening of the liquid outlet nozzle 2 by interference fit or magnetic adsorption to block the gas from escaping from the inside of the liquid cooling pipe.

[0062] Step 4:

[0063] Inject compressed air (such as 0.8 bar) into the tooling accommodation cavity through the interface 30, and the airtight test equipment (such as a differential pressure sensor) monitors the pressure change in real time.

[0064] The gas enters the first tube cavity 40 from the interface 30, covers the two sealing parts 4 through the sealing area, and closes the liquid outlet nozzle 2 through the second sealing gasket 51, forming a closed-loop detection environment.

[0065] If the sealing foam is missing or damaged, the gas leaks from the sealing part 4 to the outside, the pressure continues to drop, and the equipment is judged to be unqualified.

[0066] If the seal is intact, the gas is confined in the sealing area and inside the liquid cooling tube, and the pressure remains stable (such as within a fluctuation range of ±1%).

[0067] Step 5:

[0068] The airtightness test equipment is linked with MES (Manufacturing Execution System) to automatically upload the test results. Qualified products are released to the next process, and unqualified products are locked and an alarm is issued.

[0069] The test results (pressure curve, leakage rate) are transmitted to MES in real time through PLC or IoT module to generate a unique quality traceability code.

[0070] If the test fails, the MES automatically pauses the production process of the battery pack to prevent it from flowing into subsequent workstations (such as electrical testing or packaging).

[0071] The system records the leakage location (such as the liquid inlet nozzle 1 or the liquid outlet nozzle 2 corresponding to the sealing part 4) and guides the maintenance personnel to dismantle and rework in a targeted manner.

[0072] In summary, the present invention proposes an auxiliary tooling for airtightness testing. Through the fitting connection between the tooling housing 10 and the outer side of the panel 3, combined with the surrounding seal of the first gasket 20 for the airtight detection area, the sealing parts 4 (such as sealing parts 4 or colloids) between the nozzle ends of the liquid cooling pipes and the panel 3 are completely isolated within the sealed area, avoiding interference from the external environment. This design ensures that only the target area (sealing part 4) is detected during the airtightness test, excluding leakage interference from other non-related areas and significantly improving the accuracy of the detection results. The accommodation cavity centrally accommodates the liquid inlet nozzle 1 and the liquid outlet nozzle 2 of the liquid cooling pipe, and is quickly connected to the airtight detection equipment (such as differential pressure sensors, flow meters, etc.) through the interface 30, realizing the efficient injection of airtight detection media and the high-efficiency acquisition of pressure / flow changes. This integrated structure eliminates the need for complex disassembly of the liquid cooling pipe or the housing, simplifies the operation process, greatly shortens the detection time, and meets the high-efficiency requirements of batch production of battery packs. Traditional manual detection relies on the operator's experience to judge the tightness, and it is easy to cause misdetection or missed detection due to missing installation, damage or installation deviation of the gasket. This tooling reduces the human intervention link through mechanical sealing area isolation and standardized gas path connection, effectively avoiding detection deviations caused by human operation errors and reducing the rework and repair costs. The tooling housing 10 and the gasket can be customized according to the panel 3 structure, nozzle spacing and sealing part 4 size of different models of battery packs. Through modular adjustment (such as replacing the gasket or adjusting the accommodation cavity layout), it can quickly adapt to diverse products, reduce the tooling iteration cost, and is suitable for the multi-model mixed-line production scenario. During the test, only gas (such as compressed air or inert gas) needs to be injected into the accommodation cavity through the interface 30, and combined with the airtight detection equipment to analyze the pressure decay or flow change, without applying mechanical external force or destructive conditions such as high temperature and high pressure to the sealing part 4, avoiding damage to the sealing material during the detection process and ensuring the integrity of the battery pack's factory performance. Through highly sensitive airtightness testing, latent defects such as installation deviation, local damage or poor colloid curing of the sealing part 4 can be quickly identified, intercepting potential leakage risks in advance, avoiding unqualified products from flowing into subsequent processes or end-use scenarios, and thus improving the long-term reliability of the battery pack's waterproof and dustproof performance.

[0073] The above embodiments are only illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Any person familiar with this technology can modify or change the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or changes completed by those with ordinary knowledge in the technical field without departing from the spirit and technical ideas disclosed by the present invention should still be covered by the claims of the present invention.

[0074] In the description herein, numerous specific details are provided, such as examples of components and / or methods, to provide a thorough understanding of embodiments of the present invention. However, those skilled in the art will recognize that embodiments of the present invention may be practiced without one or more of the specific details or with other devices, systems, components, methods, parts, materials, articles, etc. In other instances, well-known structures, materials, or operations are not specifically shown or described in detail to avoid obscuring aspects of embodiments of the present invention.

[0075] Throughout the specification, reference to "an embodiment", "embodiments", or "specific embodiments" means that a particular feature, structure, or characteristic described in connection with the embodiments is included in at least one embodiment of the present invention and not necessarily in all embodiments. Thus, appearances of the phrases "in an embodiment", "in embodiments", or "in specific embodiments" in various places throughout the specification are not necessarily referring to the same embodiment. Furthermore, the particular features, structures, or characteristics of any specific embodiment of the present invention may be combined in any suitable manner with one or more other embodiments. It should be understood that other variations and modifications of the embodiments of the invention described and shown herein may be made in accordance with the teachings herein and will be considered part of the spirit and scope of the present invention.

[0076] It should also be understood that one or more of the elements shown in the figures may also be implemented in a more separated or more integrated manner, or even removed in some cases as non-operational or provided as useful in accordance with a particular application.

[0077] In addition, unless otherwise expressly specified, any of the marker arrows in the figures should be considered merely exemplary and not limiting. Further, unless otherwise indicated, the term "or" as used herein is generally intended to mean "and / or". Where the term is anticipated to be unclear due to the ability to provide separation or combination, the combination of components or steps will also be considered to be specified.

[0078] As used in the description herein and throughout the claims below, unless otherwise indicated, "a", "an", and "the" include plural references. Also, as used in the description herein and throughout the claims below, unless otherwise indicated, the meaning of "in" includes "in" and "on".

[0079] The foregoing description of the embodiments shown in this invention (including what is described in the Abstract of the Specification) is not intended to be exhaustive or to limit the invention to the precise forms disclosed herein. While specific embodiments of the invention and examples of the invention are described herein for illustrative purposes only, various equivalent modifications will be apparent to and can be made by those skilled in the art within the spirit and scope of the invention. As noted, these modifications can be made to the invention in accordance with the foregoing description of the embodiments of the invention, and these modifications will be within the spirit and scope of the invention.

[0080] The systems and methods have been described generally herein to facilitate an understanding of the details of the invention. Additionally, various specific details have been given to provide a general understanding of embodiments of the invention. However, one of ordinary skill in the relevant art will recognize that embodiments of the invention may be practiced without one or more of the specific details, or with other devices, systems, components, methods, materials, parts, etc. In other instances, well-known structures, materials, and / or operations have not been shown or described in detail to avoid obscuring aspects of the embodiments of the invention.

[0081] Accordingly, while the invention has been described herein with reference to its specific embodiments, modifications, various changes and substitutions are also within the foregoing disclosure, and it should be understood that in some instances, some features of the invention may be employed without a corresponding use of other features without departing from the scope and spirit of the claimed invention. Therefore, many modifications may be made to adapt a particular situation or material to the essential scope and spirit of the invention. The invention is not intended to be limited to the specific terms and / or the specific embodiments disclosed as the best mode contemplated for carrying out the invention, but the invention will include any and all embodiments and equivalents falling within the scope of the appended claims. Accordingly, the scope of the invention will be determined only by the appended claims.

Claims

1. An air tightness test auxiliary tool, characterized in that: include: A tooling housing for fitting to the outside of a panel connected to a battery pack housing; An accommodating cavity, provided in the tooling housing, and used to accommodate a nozzle at the end of a liquid cooling tube in a battery pack; A first sealing gasket is disposed on the inner side of the tooling shell, the first sealing gasket surrounds the airtight detection area on the panel of the battery pack shell to form a sealing area, and the sealing area is communicated with the accommodating cavity; An interface is used to connect the accommodating cavity and the airtightness detection equipment.

2. The air tightness test auxiliary tooling according to claim 1, characterized in that: The accommodating cavity includes a first tube cavity for accommodating a liquid inlet nozzle of the liquid cooling tube and a second tube cavity for accommodating a liquid outlet nozzle of the liquid cooling tube, and the first tube cavity and the second tube cavity are both connected to the sealing area.

3. The airtightness test auxiliary tooling according to claim 2, characterized in that: The interface is connected to the first tube cavity, and a second sealing gasket is arranged on the inner side of the second tube cavity, and the second sealing gasket is used to block the liquid outlet nozzle.

4. The airtightness test auxiliary tooling according to claim 1, characterized in that: The sealing part is connected to the panel via a plurality of threaded holes, and the tooling housing is provided with at least one first through hole for a connecting screw to pass through, and the position of the first through hole corresponds to the position of the threaded hole on the sealing part between the nozzle and the panel.

5. The airtightness test auxiliary tooling according to claim 4, characterized in that: A third sealing gasket is circumferentially arranged on the first through hole, and the third sealing gasket is located on the inner side of the tooling shell.

6. The airtightness test auxiliary tooling according to claim 5, characterized in that: The third sealing gasket is integrally formed with the first sealing gasket.

7. The airtightness test auxiliary tooling according to claim 4, characterized in that: One first through hole is respectively provided corresponding to the two sealing parts.

8. The airtightness test auxiliary tooling according to claim 7, characterized in that: The two first through holes are staggered in the first direction.

9. The airtightness test auxiliary tooling according to claim 4, characterized in that: The first through hole is located near the middle of the sealing area in the second direction.

10. The airtightness test auxiliary tooling according to claim 1, characterized in that: The tooling housing comprises an extension portion, the extension portion extends to a region on the panel having a mounting hole, a second through hole is provided on the extension portion, and the second through hole corresponds to a position of the mounting hole.

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