Battery pack water nozzle sealing structure and sealing detection method thereof

Abstract

The application provides a battery pack water nozzle sealing structure and a sealing detection method thereof, and belongs to the technical field of new energy batteries. By specifically optimizing the butt joint position structure above the water nozzle welded on the liquid cooling plate, the combination assembly of the inlet and outlet water positions is realized by setting the water pipe adapter platform and the inlet and outlet water nozzles with the first sealing ring and the second sealing ring set at specific positions, and a multiple sealing mechanism is formed. The first sealing ring and the second sealing ring form a seal in the radial direction and the axial direction respectively, the sealing directions of the two are perpendicular to each other, and the sealing failure modes are completely different. Even if the first sealing ring fails to seal due to factors such as angle deviation and position deviation during assembly, the second sealing ring can still maintain an effective compression state and continue to provide reliable sealing. This design can significantly improve the reliability of the entire sealing structure. The safety hazard problem caused by the defects of the existing installation and sealing modes of the inlet and outlet water nozzles is solved.

Description

Technical Field

[0001] This invention relates to the field of new energy battery technology, and in particular to a battery pack water nozzle sealing structure and its sealing detection method. Background Technology

[0002] As the core energy storage unit of electric vehicles, the new energy battery pack generates a large amount of heat during operation. Effective thermal management is crucial to ensuring battery performance, safety, and lifespan. Liquid cooling technology, due to its advantages such as high heat dissipation efficiency and uniform temperature distribution, has become the mainstream solution for current battery pack thermal management systems. In liquid cooling systems, precise temperature control of the battery is typically achieved by embedding or attaching a liquid cooling plate to the bottom of the battery module and utilizing the coolant circulating in the internal channels.

[0003] In related technologies, to achieve coolant circulation, liquid cooling plates typically have inlet and outlet nozzles on one side or at one end for connecting to external cooling pipes. A common sealing method involves placing O-rings or other elastic seals at the mating points between the nozzles and pipe joints or battery pack housing mounting holes. Through assembly and tightening, the compression deformation of the seals fills the gaps, thus preventing coolant leakage.

[0004] However, the aforementioned sealing ring structure, which relies on assembly compression, has significant drawbacks. Its sealing performance is difficult to inspect and evaluate quickly and intuitively after assembly. During assembly or use, the sealing ring is highly susceptible to misalignment due to improper positioning, or abnormal deformation or even extrusion into gaps due to excessive compression or material aging. These issues can lead to seal failure and the risk of coolant leakage. Even with a redundant design using multiple sealing rings, there is still a possibility of simultaneous failure of multiple sealing rings under improper assembly or extreme operating conditions, posing a potential threat to the safety and reliability of the battery pack. Summary of the Invention

[0005] This invention provides a battery pack water tap sealing structure and sealing detection method, which can solve the safety hazards caused by defects in the installation and sealing methods of existing water inlets and outlets. The technical solution is as follows: In a first aspect, embodiments of the present invention provide a battery pack water nozzle sealing structure, comprising: a liquid cooling plate, inlet and outlet water nozzles, and a water pipe connection platform. The liquid cooling plate is provided with a liquid cooling channel, and a welding water nozzle that is connected to the liquid cooling channel is protruding from the top of the liquid cooling plate. The water pipe transfer platform is installed on the top of the liquid cooling plate, and has a through hole that matches the outer diameter of the welding water nozzle. The depth of the through hole is greater than the height of the welding water nozzle, and the welding water nozzle is embedded in the through hole. The inlet and outlet water nozzles include a mounting base and a connecting end located on one side of the mounting base. The connecting end is embedded in the inner hole of the welded water nozzle. The mounting base is detachably mounted on the water pipe adapter platform and covers the through hole. A first sealing ring and a second sealing ring are arranged around the outer side of the connecting end at intervals. The first sealing ring abuts against the inner wall of the welded water nozzle, and the second sealing ring abuts against the bottom surface of the mounting base and the top end face of the welded water nozzle.

[0006] Optionally, a first sealing ring groove is provided around the outer wall of the connecting end, and the first sealing ring is fitted in the first sealing ring groove.

[0007] Optionally, it also includes a third sealing ring, wherein the bottom of the mounting base is provided with a second sealing ring groove arranged in a ring around the connecting end, and the third sealing ring is disposed in the second sealing ring groove and abuts against the bottom of the second sealing ring groove and the top surface of the water pipe transfer platform.

[0008] Optionally, the inner diameter of the second sealing ring groove is larger than the diameter of the through hole.

[0009] Optionally, the inner diameter of the third sealing ring is larger than the inner diameter of the groove of the second sealing ring.

[0010] Optionally, the mounting base has a plurality of screw holes arranged in an array around the connecting end, and is threadedly connected to the water pipe adapter platform through the plurality of screw holes.

[0011] Optionally, the water pipe adapter platform is provided with a plurality of through holes, and water inlet and water outlet markings are provided for each of the plurality of through holes.

[0012] Optionally, the top of the liquid cooling plate is provided with a welding positioning hole, and the bottom of the welding water nozzle is provided with a positioning protrusion that matches the welding positioning hole.

[0013] Optionally, a rounded chamfer is provided between the top end face of the welded water nozzle and the inner wall of the hole.

[0014] Secondly, embodiments of the present invention also provide a sealing detection method for detecting the sealing performance of the battery pack water tap sealing structure described in the first aspect, comprising: Disassemble and separate the inlet and outlet water nozzles from the water pipe adapter platform; With the connecting end of the inlet / outlet water nozzle at a certain angle to the axis of the through hole, repeatedly insert and remove the connecting end from the welded water nozzle until the first sealing ring comes out of the installation position. Keeping the first sealing ring in the dislodged state, install the inlet and outlet water nozzles at the normal angle, and conduct an airtightness test and a liquid flow test on the liquid cooling plate. Observe whether the mounting base and the water pipe adapter platform leak.

[0015] The beneficial effects of the technical solutions provided in the embodiments of the present invention include at least the following: This invention optimizes the docking structure above the water nozzle welded to the liquid cooling plate. By setting up a water pipe transfer platform and water nozzles with first and second sealing rings at specific locations, a multi-layered sealing mechanism is achieved. The first and second sealing rings form seals radially and axially, respectively, with their sealing directions perpendicular to each other and completely different failure modes. Even if the first sealing ring fails due to misalignment, extrusion, or other forms of seal failure during assembly caused by angular or positional deviations, the second sealing ring can still maintain effective compression in the axial direction, continuing to provide a reliable seal and offering redundant protection in case of radial seal failure. This design significantly reduces the probability of simultaneous failure of both seals, greatly improving the reliability of the entire sealing structure. It also solves the safety hazards caused by defects in existing water nozzle installation and sealing methods. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the battery pack water tap sealing structure provided in an embodiment of the present invention; Figure 2 This is a cross-sectional view of the battery pack water tap sealing structure provided in an embodiment of the present invention; Figure 3 This is a schematic diagram of the structure of the liquid cooling plate provided in an embodiment of the present invention; Figure 4 This is a schematic diagram of the inlet and outlet water nozzles provided in an embodiment of the present invention; Figure 5 This is a schematic diagram of the disassembly and separation of the inlet / outlet nozzle and the water pipe transfer platform provided in an embodiment of the present invention; Figure 6 This is a flowchart of the sealing detection method provided in the embodiments of the present invention.

[0018] In the diagram: 1-Liquid cooling plate; 1a-Liquid cooling channel; 11-Welding water nozzle; 111-Positioning protrusion; 112-Chamfered corner; 12-Welding positioning hole; 2-Inlet and outlet water nozzles; 21-Mounting base; 211-Second sealing ring groove; 212-Screw hole; 22-Connecting end; 221-First sealing ring groove; 3-Water pipe adapter platform; 31-Through hole; 32-Water inlet mark; 33-Water outlet mark; 4-First sealing ring; 5-Second sealing ring; 6-Third sealing ring. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of the present invention clearer, the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.

[0020] Figure 1 This is a schematic diagram of the battery pack water tap sealing structure provided in an embodiment of the present invention; Figure 2 This is a cross-sectional view of the battery pack water tap sealing structure provided in an embodiment of the present invention; Figure 3 This is a schematic diagram of the structure of the liquid cooling plate provided in an embodiment of the present invention; Figure 4 This is a schematic diagram of the inlet and outlet water nozzles provided in an embodiment of the present invention; Figure 5 This is a schematic diagram illustrating the disassembly and separation of the inlet / outlet water nozzle and the water pipe adapter platform provided in an embodiment of the present invention. Figures 1 to 5 As shown, an embodiment of the present invention provides a battery pack water nozzle sealing structure, including: a liquid cooling plate 1, an inlet / outlet water nozzle 2, and a water pipe adapter platform 3.

[0021] Specifically, the liquid cooling plate 1 is the core component of the battery pack liquid cooling system. It has an internal liquid cooling channel 1a through which the coolant circulates, carrying away the heat generated during battery operation and achieving precise temperature control. To facilitate the inflow and outflow of coolant, a welded water nozzle 11 protrudes from the top of the liquid cooling plate 1. This nozzle is directly connected to the liquid cooling channel 1a and is fixed to the liquid cooling plate 1 using a welding process, ensuring reliable connection and sealing.

[0022] In this embodiment, the water pipe adapter platform 3 is installed on top of the liquid cooling plate 1, serving to receive the inlet and outlet water nozzles 2 and provide sealing support. The water pipe adapter platform 3 is provided with a through hole 31 that matches the outer diameter of the welded water nozzle 11. The depth of the through hole 31 is greater than the height of the welded water nozzle 11, allowing the welded water nozzle 11 to be completely embedded within the through hole 31. This embedded structure design ensures coaxial fit between the welded water nozzle 11 and the water pipe adapter platform 3, while also reserving necessary space for the subsequent installation of the inlet and outlet water nozzles 2, and providing a structural basis for the installation and compression of the sealing ring.

[0023] The inlet / outlet nozzle 2 is a key component connecting the external cooling pipes to the internal flow channel of the liquid cooling plate 1. It includes a mounting base 21 and a connecting end 22 located on one side of the mounting base 21. The main function of the mounting base 21 is to achieve a reliable mechanical connection and seal with the water pipe adapter platform 3, while the connecting end 22 is responsible for inserting into the inner hole of the welded nozzle 11 to form a flow channel connection with the welded nozzle 11. In the assembled state, the connecting end 22 is embedded in the inner hole of the welded nozzle 11, and the mounting base 21 is detachably installed on the water pipe adapter platform 3, completely covering the through hole 31, thereby forming a complete flow channel passage from the external pipes to the liquid cooling flow channel 1a.

[0024] Furthermore, a first sealing ring 4 and a second sealing ring 5 are spaced around the outer side of the connecting end 22. These two sealing rings are spatially independent and perform different sealing functions, forming a reliable double sealing guarantee. The first sealing ring 4 abuts against the inner wall of the welded water nozzle 11, forming a first radial seal. In the assembled state, the first sealing ring 4 is radially compressed, and its elastic deformation fills the gap between the outer wall of the connecting end 22 and the inner wall of the welded water nozzle 11, thereby preventing coolant leakage in the radial direction. The second sealing ring 5 is positioned differently from the first sealing ring 4, abutting between the bottom surface of the mounting base 21 and the top end face of the welded water nozzle 11, forming an axial seal. Specifically, when the inlet / outlet water nozzle 2 is fixed to the water pipe adapter platform 3 by bolts, the mounting base 21 is pressed downward, and the second sealing ring 5 is axially compressed between the bottom surface of the mounting base 21 and the top end face of the welded water nozzle 11. This axial compression causes the second sealing ring 5 to elastically deform, filling the tiny gap between the two end faces, thereby forming an effective axial seal.

[0025] This invention specifically optimizes the docking structure above the water nozzle 11 welded to the liquid cooling plate 1. It achieves a combined assembly of the inlet and outlet water positions by setting a water pipe transfer platform 3 and inlet / outlet water nozzles 2 with first and second sealing rings 4 and 5 at specific locations, forming a multi-layered sealing mechanism. The first and second sealing rings 4 and 5 form seals radially and axially, respectively, with their sealing directions perpendicular to each other and completely different failure modes. Even if the first sealing ring 4 experiences misalignment, extrusion, or other forms of seal failure during assembly due to angular or positional deviations, the second sealing ring 5 can still maintain effective compression in the axial direction, continuing to provide a reliable seal and providing redundant protection in case of radial seal failure. This design significantly reduces the probability of simultaneous failure of both seals, significantly improving the reliability of the entire sealing structure. It solves the safety hazards caused by defects in existing inlet and outlet water nozzle installation and sealing methods.

[0026] Optionally, a first sealing ring groove 221 is provided around the outer wall of the connecting end 22, and the first sealing ring 4 is sleeved in the first sealing ring groove 221.

[0027] To ensure the accurate positioning of the first sealing ring 4 during assembly, in a further optimized embodiment, a first sealing ring groove 221 is provided around the outer wall of the connecting end 22, and the first sealing ring 4 is fitted into the first sealing ring groove 221. The first sealing ring groove 221 provides a clear installation position and axial limit for the first sealing ring 4, preventing axial movement of the first sealing ring 4 during assembly or use.

[0028] Specifically, the depth and width of the first sealing ring groove 221 are designed to match the cross-sectional dimensions of the first sealing ring 4. In its free state, the outer diameter of the first sealing ring 4 is larger than the bottom diameter of the first sealing ring groove 221, allowing the first sealing ring 4 to be partially embedded in the groove. When the connecting end 22 is inserted into the inner hole of the welding nozzle 11, the first sealing ring 4 is subjected to radial compression by the inner wall of the welding nozzle 11, causing its cross-section to undergo elastic deformation. Part of its volume is compressed towards the groove depth, while another part expands towards the groove width, eventually stabilizing in an equilibrium state. The two side walls of the first sealing ring groove 221 axially limit the first sealing ring 4, preventing it from axially shifting under the pressure of the coolant.

[0029] Furthermore, the first sealing ring groove 221 also serves to absorb tolerances. In actual production, the outer diameter of the connecting end 22 and the inner diameter of the welded water nozzle 11 both have manufacturing tolerances. Through the design of the first sealing ring groove 221, these tolerances can be absorbed within a certain range, ensuring that the first sealing ring 4 can obtain a suitable compression under different assembly conditions, thereby ensuring the consistency and stability of the sealing effect. More importantly, in addition to serving as the first radial seal, the stable positioning of the first sealing ring 4 within the first sealing ring groove 221 also provides horizontal limiting and support for the second sealing ring 5, ensuring that the second sealing ring 5 will not undergo radial displacement during assembly and guaranteeing the correct axial sealing position of the second sealing ring 5.

[0030] Optionally, it also includes a third sealing ring 6. The bottom of the mounting base 21 is provided with a second sealing ring groove 211 arranged in a ring around the connecting end 22. The third sealing ring 6 is disposed in the second sealing ring groove 211 and abuts against the bottom of the second sealing ring groove 211 and the top surface of the water pipe transfer platform 3.

[0031] To further improve the reliability of the entire sealing system, in another preferred embodiment, the battery pack water nozzle sealing structure also includes a third sealing ring 6. The third sealing ring 6 is positioned differently from the first two sealing rings, and its main function is to form a box seal between the mounting base 21 and the water pipe adapter platform 3 to prevent coolant from leaking outward from the connection interface between the inlet / outlet water nozzle 2 and the water pipe adapter platform 3.

[0032] Specifically, the bottom of the mounting base 21 is provided with a second sealing ring groove 211 arranged in a ring around the connecting end 22, and the third sealing ring 6 is disposed in the second sealing ring groove 211. The second sealing ring groove 211 is an annular groove, with its bottom parallel to the bottom surface of the mounting base 21, and its inner and outer sidewalls perpendicular to the bottom surface. The cross-sectional height of the third sealing ring 6 in its free state is greater than the groove depth of the second sealing ring groove 211. Therefore, when the mounting base 21 is fixed to the water pipe adapter platform 3 by bolts, the third sealing ring 6 will simultaneously abut against the bottom of the second sealing ring groove 211 and the top surface of the water pipe adapter platform 3, and undergo elastic deformation due to axial compression, thereby forming an effective seal between the bottom surface of the mounting base 21 and the top surface of the water pipe adapter platform 3.

[0033] This enclosure sealing design adds a third line of defense to the entire sealing system. Even in extreme cases where the first two seals (first sealing ring 4 and second sealing ring 5) fail and coolant leaks into the space between the mounting base 21 and the water pipe adapter platform 3, the third sealing ring 6 can still prevent coolant from leaking into the external environment, thereby avoiding damage to the external components of the battery pack and preventing coolant waste.

[0034] Optionally, the inner diameter of the second sealing ring groove 211 is larger than the diameter of the through hole 31.

[0035] In a preferred embodiment, the inner diameter of the second sealing ring groove 211 is larger than the diameter of the through hole 31. This dimensional relationship ensures that the second sealing ring groove 211 is completely located outside the through hole 31, so that the sealing position of the third sealing ring 6 is located on the top surface of the water pipe adapter platform 3 outside the welded water nozzle 11.

[0036] Specifically, because the inner diameter of the second sealing ring groove 211 is larger than the diameter of the through hole 31, when the mounting base 21 covers the through hole 31, there is a certain radial distance between the inner edge of the second sealing ring groove 211 and the outer edge of the through hole 31. This radial distance provides sufficient installation space for the third sealing ring 6, allowing it to be fully pressed onto the solid part of the water pipe adapter platform 3 without the sealing ring being suspended or subjected to uneven force due to the presence of the through hole 31. This design ensures that the third sealing ring 6 can deform uniformly under pressure, achieving a stable sealing effect.

[0037] Furthermore, in another embodiment, the inner diameter of the third sealing ring 6 is larger than the inner diameter of the second sealing ring groove 211. This dimensional relationship is primarily designed to prevent the third sealing ring 6 from moving inward during assembly or use, thereby avoiding interference from the connecting end 22 or the welded water nozzle 11. Because the inner diameter of the third sealing ring 6 has a margin, even if it undergoes a certain degree of radial expansion under axial compression, it will not come into contact with the central component, ensuring that it can freely undergo elastic deformation, thus guaranteeing the stability of the sealing performance.

[0038] Optionally, the mounting base 21 has a plurality of screw holes 212 arranged in an array around the connecting end 22, and is threadedly connected to the water pipe adapter platform 3 through the plurality of screw holes 212.

[0039] To achieve reliable connection and disassembly between the inlet / outlet nozzle 2 and the water pipe adapter platform 3, in one embodiment, the mounting base 21 has a plurality of screw holes 212 arranged in an array around the connection end 22. These screw holes 212 are threadedly connected to the corresponding threaded holes on the water pipe adapter platform 3 by bolts. The number of screw holes 212 is usually four or more, evenly distributed around the connection end 22 to form a symmetrical layout.

[0040] During assembly, the operator first aligns the connecting end 22 of the inlet / outlet nozzle 2 with the inner hole of the welded nozzle 11, initially inserting the connecting end 22. Then, the mounting base 21 is aligned with the threaded hole on the water pipe adapter platform 3, and the bolts are inserted and tightened gradually in a diagonal sequence. During tightening, the second sealing ring 5 and the third sealing ring 6 are gradually compressed. When the bolt reaches the specified torque value, both sealing rings reach the designed compression amount, forming an effective seal. This assembly method is simple, reliable, and easy to automate or semi-automate.

[0041] Optionally, the water pipe transfer platform 3 is provided with multiple through holes 31, and each of the multiple through holes 31 is provided with a water inlet mark 32 and a water outlet mark 33.

[0042] In practical applications, liquid cooling systems typically require multiple inlet and outlet nozzles to achieve effective coolant circulation. To prevent incorrect connection of the inlet and outlet nozzles during assembly or maintenance, which could lead to incorrect coolant flow and affect heat dissipation, in one embodiment of this invention, multiple through holes 31 are provided on the water pipe adapter platform 3, with corresponding inlet and outlet markings 32 and 33. By clearly marking the inlet and outlet, operators can quickly and accurately identify the function of each through hole 31 when connecting external pipes, avoiding connection errors. This error-proof design not only improves assembly efficiency and reduces rework due to human error but also enhances the operational reliability of the liquid cooling system, ensuring that the coolant flows along the designed path and achieves optimal heat dissipation.

[0043] Optionally, the top of the liquid cooling plate 1 is provided with a welding positioning hole 12, and the bottom of the welding water nozzle 11 is provided with a positioning protrusion 111 that matches the welding positioning hole 12.

[0044] To ensure the positional accuracy of the welding nozzle 11 when welding to the liquid cooling plate 1, in a preferred embodiment, a welding positioning hole 12 is provided on the top of the liquid cooling plate 1, and a positioning protrusion 111 matching the welding positioning hole 12 is provided on the bottom of the welding nozzle 11. The shape and size of the positioning protrusion 111 are precisely matched with the welding positioning hole 12. Before welding, the positioning protrusion 111 is inserted into the welding positioning hole 12, thereby achieving precise positioning of the welding nozzle 11 relative to the liquid cooling plate 1.

[0045] The design of this positioning structure is of great significance. First, it ensures that the central axis of the welding nozzle 11 is aligned with the outlet center of the liquid cooling channel 1a, preventing channel misalignment due to positional deviations and reducing channel resistance and pressure loss. Second, the engagement between the positioning protrusion 111 and the welding positioning hole 12 allows it to withstand a certain lateral force during welding, preventing displacement of the welding nozzle 11 during heating and ensuring weld quality and connection reliability. Third, this mechanical positioning method is simple and effective, eliminating the need for complex fixtures, reducing production costs, and improving production efficiency.

[0046] Optionally, a rounded chamfer 112 is provided between the top end face of the welded water nozzle 11 and the inner wall of the hole.

[0047] Specifically, the rounded chamfer 112 eliminates the sharp right angle between the top end face of the welded water nozzle 11 and the inner wall of the bore, forming a smooth transition surface. When the second sealing ring 5 is compressed, its outer portion contacts the rounded chamfer 112. Because the rounded chamfer 112 has a continuously varying curvature, the second sealing ring 5 can distribute stress more evenly during deformation, avoiding stress concentration at sharp edges, thereby reducing the risk of the sealing ring being cut or over-compressed and extending its service life.

[0048] In actual operation, the coolant in the battery pack water nozzle sealing structure of this invention enters the inlet / outlet water nozzle 2 from the external pipeline, flows through the connection end 22 into the welded water nozzle 11, and finally enters the liquid cooling channel 1a inside the liquid cooling plate 1. During the flow of the coolant, the first sealing ring 4, the second sealing ring 5, and the third sealing ring 6 work together to form three lines of sealing protection.

[0049] The first sealing ring 4 serves as the first radial seal, preventing coolant leakage from the radial gap between the connecting end 22 and the welded water nozzle 11. The second sealing ring 5 serves as the second axial seal; even if the first sealing ring 4 fails due to installation angle deviation or other reasons, the second sealing ring 5 can still maintain a compressed state in the axial direction, continuing to provide an effective seal and preventing coolant leakage upward into the space between the mounting base 21 and the water pipe adapter platform 3. The third sealing ring 6 serves as the third housing seal; even if the first two seals fail, the third sealing ring 6 can still prevent coolant leakage into the external environment.

[0050] This multi-layered, multi-directional sealing design significantly improves the reliability of the sealing system. Compared to traditional single-seal methods, the probability of seal failure in this invention is greatly reduced. Even under conditions of suboptimal assembly quality or harsh operating conditions, coolant leakage is prevented, thus ensuring the normal operation of the battery pack's liquid cooling system and improving the battery pack's safety and reliability.

[0051] Figure 6 This is a flowchart of the sealing detection method provided in an embodiment of the present invention. Figure 6 As shown, embodiments of the present invention also provide a seal detection method for detecting, for example... Figures 1 to 5 The sealing performance of the battery pack water tap sealing structure shown includes: S1. Disassemble the inlet / outlet nozzles 2 from the water pipe adapter platform 3.

[0052] The specific operation involves loosening the bolts connecting the mounting base 21 to the water pipe adapter platform 3, removing the inlet / outlet nozzles 2 from the water pipe adapter platform 3, and completely disengaging the connecting end 22 from the inner hole of the welded nozzle 11. This step aims to provide initial conditions for subsequent simulated assembly operations.

[0053] S2. With the connecting end 22 of the inlet / outlet water nozzle 2 at a certain angle to the axis of the through hole 31, repeatedly insert and remove the connecting end 22 from the welded water nozzle 11 until the first sealing ring 4 comes off from the installation position.

[0054] refer to Figure 5 In this step, the operator intentionally makes the connecting end 22 not parallel to the axis of the through hole 31, but rather forms a certain angle, such as a tilt angle of 5 to 15 degrees. In this tilted state, the connecting end 22 is repeatedly inserted into and pulled out of the inner hole of the welding nozzle 11.

[0055] Because the axis of the connecting end 22 does not coincide with the axis of the inner hole of the welded water nozzle 11, the first sealing ring 4 will be subjected to uneven compression and pulling during insertion and removal, disrupting its fit with the first sealing ring groove 221, ultimately causing the first sealing ring 4 to partially or completely detach from the first sealing ring groove 221. After each insertion and removal, the operator checks the state of the first sealing ring 4 to observe whether it is still in the correct position or has become misaligned, flipped, or detached. This operation is repeated until it is confirmed that the first sealing ring 4 has detached from its normal installation position, resulting in a clear sealing failure.

[0056] S3. Keep the first sealing ring 4 in the dislodged state, install the inlet and outlet water nozzles 2 at the normal angle, and conduct an airtightness test and a liquid flow test on the liquid cooling plate 1. Observe whether the mounting base 21 and the water pipe adapter platform 3 leak.

[0057] In this step, without restoring the first sealing ring 4 to its normal position, i.e. keeping the first sealing ring 4 in a dislodged or misaligned state, the operator inserts the connecting end 22 into the inner hole of the welding nozzle 11 along the correct axial direction according to the standard assembly process. Then, the mounting base 21 is aligned with the water pipe adapter platform 3, the bolts are inserted and tightened to the specified torque to completely fix the inlet and outlet nozzles 2.

[0058] After assembly, airtightness and fluid flow tests are performed. The airtightness test typically involves introducing compressed air or nitrogen into the inlet / outlet nozzles 2 and maintaining this pressure (e.g., 0.3 MPa to 0.5 MPa) for a certain period (e.g., 2 to 5 minutes). The pressure is then observed to see if it drops, and simultaneously, the connection interface between the mounting base 21 and the water pipe adapter platform 3 is checked for air bubbles. If the pressure remains stable and no air bubbles are present, the airtightness is good.

[0059] The liquid flow test involves introducing coolant into the liquid cooling channel 1a of the liquid cooling plate 1, allowing the coolant to flow in from the inlet, pass through the liquid cooling channel 1a, and then flow out from the outlet, forming a circulation. During the liquid flow process, the connection interface between the mounting base 21 and the water pipe adapter platform 3 is observed to check for any coolant leakage or dripping. If the mounting base 21 and the water pipe adapter platform 3 remain dry throughout the entire test, without any coolant leakage, it indicates that even if the first sealing ring 4 fails, the second sealing ring 5 still provides an effective seal, verifying the reliability of the dual sealing mechanism.

[0060] The above-described sealing test method allows for a quantitative assessment of the reliability of the sealing structure during the product design or production verification phase. If the test results show that even if the first sealing ring 4 fails, the second sealing ring 5 can still guarantee a seal, it proves that the sealing structure design is reasonable and has high fault tolerance. Conversely, if leakage occurs during the test, it indicates that the sealing structure or assembly process needs to be optimized and improved. This verifiable and detectable design approach is a significant advancement of this invention compared to existing technologies, solving the problem of undetectable sealing status in traditional sealing solutions.

[0061] In summary, the battery pack water tap sealing structure and its sealing detection method of the present invention solve the problem of simultaneous failure of traditional single sealing methods by setting the first sealing ring 4 and the second sealing ring 5 to form independent seals in the radial and axial directions, respectively, thus significantly improving sealing reliability. The first sealing ring 4, in conjunction with the first sealing ring groove 221, achieves precise positioning and axial limiting, while providing horizontal support for the second sealing ring 5. The second sealing ring 5 is compressed in the axial direction, so even if the first sealing ring 4 fails due to assembly angle deviation or other reasons, the second sealing ring 5 can still maintain an effective seal.

[0062] The addition of the third sealing ring 6 further enhances the enclosure's seal, creating triple protection. A well-matched dimensional system ensures that each sealing ring receives appropriate compression and a stable stress state. The multi-bolt connection structure guarantees assembly reliability and disassembly, while inlet / outlet markings and welded positioning improve assembly accuracy and efficiency. The rounded chamfer optimizes the stress state of the sealing rings, extending their service life.

[0063] The sealing test method verifies the effectiveness of the dual sealing mechanism by simulating the most unfavorable assembly conditions, providing a reliable means for the design optimization and quality control of the sealing structure. Compared with existing technologies, this invention not only improves the reliability of the seal but also achieves the detectability of the sealing state, significantly reducing the risk of coolant leakage and ensuring the safe and stable operation of the battery pack liquid cooling system.

[0064] Unless otherwise defined, the technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this invention pertains. The terms “first,” “second,” and similar terms used in this patent application specification and claims do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Similarly, the terms “an” or “a” and similar terms do not indicate a quantity limitation, but rather indicate the presence of at least one. The terms “comprising” or “including” and similar terms mean that the elements or objects preceding “comprising” or “including” encompass the elements or objects listed following “comprising” or “including” and their equivalents, and do not exclude other elements or objects. The terms “connected” or “linked” and similar terms are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. The terms “upper,” “lower,” “left,” and “right” are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0065] The above description is only an optional embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of this utility model.

Claims

1. A battery pack water tap sealing structure, characterized in that, include: Liquid cooling plate (1), inlet and outlet water nozzles (2) and water pipe transfer platform (3). The liquid cooling plate (1) is provided with a liquid cooling channel (1a), and a welding water nozzle (11) is provided on the top of the liquid cooling plate (1) and connected to the liquid cooling channel (1a). The water pipe transfer platform (3) is installed on the top of the liquid cooling plate (1), and a through hole (31) matching the outer diameter of the welding water nozzle (11) is provided on it. The depth of the through hole (31) is greater than the height of the welding water nozzle (11), and the welding water nozzle (11) is embedded in the through hole (31). The inlet and outlet water nozzle (2) includes a mounting base (21) and a connecting end (22) located on one side of the mounting base (21). The connecting end (22) is embedded in the inner hole of the welded water nozzle (11). The mounting base (21) is detachably installed on the water pipe adapter platform (3) and covers the through hole (31). A first sealing ring (4) and a second sealing ring (5) are arranged around the outer side of the connecting end (22) at intervals. The first sealing ring (4) abuts against the inner wall of the welded water nozzle (11), and the second sealing ring (5) abuts against the bottom surface of the mounting base (21) and the top end face of the welded water nozzle (11).

2. The battery pack water tap sealing structure according to claim 1, characterized in that, A first sealing ring groove (221) is provided around the outer wall of the connecting end (22), and the first sealing ring (4) is fitted in the first sealing ring groove (221).

3. The battery pack water tap sealing structure according to claim 1, characterized in that, It also includes a third sealing ring (6). The bottom of the mounting base (21) is provided with a second sealing ring groove (211) arranged in a ring around the connecting end (22). The third sealing ring (6) is disposed in the second sealing ring groove (211) and abuts against the bottom of the second sealing ring groove (211) and the top surface of the water pipe transfer platform (3).

4. The battery pack water tap sealing structure according to claim 3, characterized in that, The inner diameter of the second sealing ring groove (211) is larger than the diameter of the through hole (31).

5. A battery pack water tap sealing structure according to claim 4, characterized in that, The inner diameter of the third sealing ring (6) is larger than the inner diameter of the second sealing ring groove (211).

6. The battery pack water tap sealing structure according to claim 1, characterized in that, The mounting base (21) has a plurality of screw holes (212) arranged in an array around the connecting end (22), and is threadedly connected to the water pipe adapter platform (3) through the plurality of screw holes (212).

7. A battery pack water tap sealing structure according to any one of claims 1 to 6, characterized in that, The water pipe transfer platform (3) is provided with multiple through holes (31), and water inlet markings (32) and water outlet markings (33) are provided for the multiple through holes (31).

8. A battery pack water tap sealing structure according to any one of claims 1 to 6, characterized in that, The top of the liquid cooling plate (1) is provided with a welding positioning hole (12), and the bottom of the welding water nozzle (11) is provided with a positioning protrusion (111) that matches the welding positioning hole (12).

9. A battery pack water tap sealing structure according to any one of claims 1 to 6, characterized in that, The top end face of the welded water nozzle (11) is provided with a rounded chamfer (112) between the inner wall and the top end face.

10. A sealing test method for detecting the sealing performance of a battery pack water tap sealing structure as described in any one of claims 1 to 9, characterized in that, include: Disassemble the inlet / outlet nozzle (2) from the water pipe adapter platform (3); With the connecting end (22) of the inlet / outlet water nozzle (2) at a certain angle to the axis of the through hole (31), the connecting end (22) and the welded water nozzle (11) are repeatedly inserted and removed until the first sealing ring (4) is removed from the installation position. Keep the first sealing ring (4) in the dislodged state, install the inlet and outlet water nozzles (2) at the normal angle, and conduct an airtightness test and a liquid flow test on the liquid cooling plate (1). Observe whether the mounting base (21) and the water pipe adapter platform (3) leak liquid.

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