A new energy automobile battery cooling plate connecting sealing pipe structure

Abstract

The utility model relates to the technical field of sealing pipe, and disclose a new energy automobile battery cooling plate connecting sealing pipe structure, including the connecting seat of installation at the cooling liquid import and export department of battery cooling plate, the opening end of connecting seat is equipped with fixed pipe, and the opening end of fixed pipe is connected with infusion pipe through connecting pipe, the one end of connecting pipe away from infusion pipe extends to fixed pipe and is equipped with sealing joint, and the inner wall of one end of fixed pipe close to connecting seat has spherical surface, and the free end of sealing joint is ball head and is close to spherical surface, the one end of sealing joint close to connecting pipe is sealedly connected with the inner wall of fixed pipe through sealing washer, and the outer periphery of connecting pipe is fixedly equipped with fixed ring, the utility model discloses triple sealing mechanism of spherical surface sealing, sealing washer sealing combination mechanical locking, compared with traditional screw connection, can effectively reduce the leakage rate of cooling liquid, thereby satisfying the sealing requirement of high pressure cooling liquid environment.

Description

Technical Field

[0001] This utility model relates to the field of sealing tube technology, specifically a sealing tube structure for connecting cooling plates of new energy vehicle batteries. Background Technology

[0002] The battery cooling plate in new energy vehicles is a core component of the liquid cooling module for battery thermal management. Its main function is to remove excess heat generated during battery operation through the circulation of coolant, thereby achieving cooling and temperature reduction. This not only helps extend the battery's lifespan but also effectively ensures the operational safety of the battery pack.

[0003] Sealing pipes are connecting pipes installed at the coolant inlet and outlet of the cooling plate of new energy vehicle batteries. They are mainly used to connect the inlet and outlet of coolant circulation equipment. However, due to design flaws, traditional sealing pipe structures expose the following problems under complex working conditions such as high pressure and vibration:

[0004] 1. Single thread seals are not reliable enough and have a high risk of leakage.

[0005] Traditional sealing tubes rely solely on threaded connections, and the thread gaps can easily lead to coolant leakage. During battery charging and discharging, coolant pressure fluctuations can reach 0.5-1.5 MPa. Threaded connections are prone to loosening due to vibration (such as the vibration frequency of 20-2000 Hz when a car is running), resulting in a leakage rate as high as 5-8%. Furthermore, coolant leakage may cause battery short circuits, posing a significant safety hazard.

[0006] 2. Inability to adapt to assembly tolerances, resulting in poor sealing consistency.

[0007] Traditional structures require extremely high precision in the machining of parts (tolerances must be controlled within ±0.02mm), but in actual production, the coaxiality deviation between the connecting pipe and the fixed pipe often exceeds 0.1mm, which leads to unilateral extrusion deformation of the sealing ring and increases the risk of seal failure.

[0008] In summary, traditional sealed pipe structures have poor actual sealing performance, making it difficult to guarantee the long-term stable operation of the cooling system and prone to safety accidents due to coolant leakage. Utility Model Content

[0009] To address the technical problems existing in the background art, this utility model proposes a sealing pipe structure for connecting cooling plates of new energy vehicle batteries.

[0010] The present invention proposes a connecting sealing pipe structure for a new energy vehicle battery cooling plate, including a connecting seat installed at the coolant inlet and outlet of the battery cooling plate, a fixing pipe installed at the open end of the connecting seat, and the open end of the fixing pipe connected to the liquid delivery pipe through the connecting pipe.

[0011] The end of the connecting tube away from the infusion tube extends into the fixed tube and is equipped with a sealing joint. The inner wall of the end of the fixed tube near the connecting seat has a spherical surface, and the free end of the sealing joint is a ball head that is in close contact with the spherical surface.

[0012] The end of the sealing joint near the connecting pipe is sealed to the inner wall of the fixed pipe through a sealing ring;

[0013] The outer periphery of the connecting pipe is fitted with a fixing ring, which is in close contact with the open end face of the fixing pipe and is locked to the fixing pipe by a locking cap.

[0014] As a further optimization of this utility model, a connecting pipe is installed at one end of the sealing joint near the connecting pipe, the sealing ring is fitted on the outer circumference of the connecting pipe, and the connecting pipe and the connecting pipe are threaded together.

[0015] As a further optimization of this utility model, the diameter of the connecting pipe and the sealing joint is the same and larger than the inner diameter of the sealing ring, and the sealing ring is fitted into the annular groove formed between the connecting pipe, the connecting pipe and the sealing joint.

[0016] As a further optimization of this utility model, the outer periphery of the connecting tube is provided with a centered annular lip, and the inner wall of the sealing ring has a sealing lip that matches the annular lip, and the sealing lip is seamlessly engaged with the connecting tube through the annular lip.

[0017] As a further optimization of this utility model, an annular sealing groove adapted to the sealing ring is provided on the inner wall of the fixed tube near its opening, and the outer circle of the sealing ring is sealed to the fixed tube through the annular sealing groove.

[0018] As a further optimization of this utility model, the outer surface of the ball head of the sealing joint has a leak-proof layer, and the leak-proof layer is seamlessly attached to the ball surface.

[0019] As a further optimization of this utility model, the leak-proof layer is a fluororubber layer.

[0020] As a further optimization of this utility model, the axes of the connecting seat, the fixing pipe, the sealing joint, the connecting pipe, and the infusion pipe coincide and are connected in sequence.

[0021] As a further optimization of this utility model, the diameter of the fixing ring is the same as the diameter of the fixing tube, the locking cover is an annular cover and is fitted on the end of the connecting tube away from the fixing tube, the opening end of the locking cover is threadedly connected to the opening end of the fixing tube, and the fixing ring is in close contact with the inner wall end face of the locking cover.

[0022] The new energy vehicle battery cooling plate connecting sealing pipe structure proposed in this utility model has the following characteristics:

[0023] Beneficial effects:

[0024] (I) This utility model has the following triple sealing mechanism:

[0025] Spherical seal: The ball head of the sealing joint is in close contact with the spherical surface of the inner wall of the fixed pipe, and the spherical geometry is used to achieve a seal without dead angles, effectively blocking the axial leakage path of coolant;

[0026] Sealing ring sealing: The sealing ring is fitted around the outer circumference of the connecting pipe, and its sealing lip engages with the annular lip of the connecting pipe. At the same time, the outer circle is embedded in the annular sealing groove of the fixed pipe, forming a radial double seal to accommodate the small tolerances of the connecting pipe and the fixed pipe.

[0027] Mechanical locking seal: The retaining ring and the locking cover cooperate to clamp the retaining ring at the opening end of the fixed pipe through the thread, preventing the connecting pipe from loosening axially and ensuring that the spherical surface and the sealing ring always remain in a compressed state;

[0028] Through the synergistic effect of triple sealing, compared with traditional threaded connections, the coolant leakage rate can be effectively reduced, thereby meeting the sealing requirements of high-pressure coolant environments;

[0029] (ii) The connecting pipe and the connecting tube are threaded together, allowing for axial adjustment within a certain range to compensate for manufacturing tolerances and assembly errors. The sealing joint has the same diameter as the connecting pipe, and the sealing ring is installed in the annular groove. Even if there is a slight eccentricity between the connecting pipe and the fixed pipe, reliable sealing can still be achieved through the elastic deformation of the sealing ring, improving the interchangeability of parts and thus reducing assembly difficulty and cost.

[0030] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the docking structure between the present invention and the battery cooling plate;

[0032] Figure 2 This is a cross-sectional structural diagram of the fixing tube of this utility model;

[0033] Figure 3 This is a cross-sectional structural diagram of the connecting pipe of this utility model.

[0034] Figure descriptions: 1. Connecting seat; 2. Fixing tube; 3. Connecting tube; 4. Infusion tube; 5. Sealing joint; 6. Spherical surface; 7. Sealing ring; 8. Fixing ring; 9. Locking cap; 10. Connecting tube; 11. Sealing lip; 12. Leak-proof layer; 13. Battery cooling plate. Detailed Implementation

[0035] The embodiments of this utility model are described in detail below. Examples of these embodiments are illustrated in the accompanying drawings, wherein the same or similar symbols denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0036] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0037] like Figure 1 and Figure 2 As shown, a new energy vehicle battery cooling plate connecting sealing pipe structure includes a connecting seat 1 installed at the coolant inlet and outlet of the battery cooling plate 13, a fixing pipe 2 installed at the open end of the connecting seat 1, and the open end of the fixing pipe 2 connected to the liquid delivery pipe 4 through a connecting pipe 3.

[0038] The end of the connecting tube 3 away from the infusion tube 4 extends into the fixed tube 2 and is equipped with a sealing joint 5. The inner wall of the fixed tube 2 near the connecting seat 1 has a spherical surface 6. The free end of the sealing joint 5 is a ball head and is in close contact with the spherical surface 6.

[0039] The ball head of the sealing joint 5 forms a surface contact with the spherical surface 6 of the fixed pipe 2. The axial clearance is eliminated by utilizing the geometric characteristics of the spherical surface, blocking the path of coolant leakage along the contact surface. It is especially suitable for high-pressure environments such as 1.5MPa coolant environments, and the leakage rate is reduced by more than 90% compared with traditional threaded connections.

[0040] The end of the sealing joint 5 near the connecting pipe 3 is sealed to the inner wall of the fixed pipe 2 through the sealing ring 7 to achieve radial sealing;

[0041] The outer periphery of the connecting pipe 3 is fitted with a fixing ring 8. The fixing ring 8 is in close contact with the open end face of the fixing pipe 2 and is locked to the fixing pipe 2 by the locking cap 9, providing continuous axial pressure (preload ≥ 50N) to ensure that the spherical surface is always in a compressed state and to avoid sealing failure caused by vibration such as the 20-2000Hz vibration when a car is running.

[0042] To address the issue of poor sealing performance in traditional threaded pipe connections, this design employs a triple sealing mechanism combining spherical sealing, sealing ring sealing, and mechanical locking. Compared to traditional threaded connections, this effectively reduces coolant leakage and meets the sealing requirements of high-pressure coolant environments.

[0043] Specifically, such as Figure 3 As shown, a connecting pipe 10 is installed at one end of the sealing joint 5 near the connecting pipe 3, the sealing ring 7 is fitted on the outer periphery of the connecting pipe 10, and the connecting pipe 10 is threadedly connected to the connecting pipe 3.

[0044] The threaded connection between the connecting pipe 10 and the connecting pipe 3 allows for axial adjustment of ±1.5mm to compensate for manufacturing tolerances (such as connecting pipe length error ±1mm) and assembly errors. For example, when there is a positional deviation in the battery cooling plate mounting hole, the insertion depth of the sealing joint 5 can be adjusted by rotating the connecting pipe 3 to ensure that the ball head and the ball surface 6 fit tightly together, thereby improving assembly adaptability.

[0045] Furthermore, the diameter of the connecting pipe 3 and the sealing joint 5 is the same and larger than the inner diameter of the sealing ring 7. The sealing ring 7 is fitted into the annular groove formed between the connecting pipe 3, the connecting pipe 10, and the sealing joint 5.

[0046] The annular groove design partially encloses the sealing ring 7, improving the installation stability of the sealing ring 7. The connecting pipe 3 and the sealing joint 5 have the same diameter so that they can be assembled into the fixed pipe 2 and then sealed by the sealing ring 7.

[0047] In the fast charging scenario of new energy vehicle batteries, the coolant flow rate increases to 5L / min and the pressure suddenly increases to 2MPa. Traditional threaded seals are unable to withstand the instantaneous high pressure impact, which may cause coolant spraying accidents and damage to electrical components in the battery compartment. To solve this problem, an annular lip is provided on the outer periphery of the connecting pipe 10, and the inner wall of the sealing ring 7 has a sealing lip 11 that is adapted to the annular lip. The sealing lip 11 is seamlessly connected to the connecting pipe 10 through the annular lip.

[0048] The sealing lip 11 and the annular lip fit together (fitting gap ≤ 0.05mm) to form a labyrinth seal, further preventing coolant penetration. When the coolant pressure suddenly rises to 2MPa, the sealing lip 11 presses tightly against the annular lip under hydraulic pressure, increasing the contact stress by 30% and ensuring sealing reliability.

[0049] Specifically, such as Figure 3 As shown, an annular sealing groove adapted to the sealing ring 7 is provided on the inner wall of the fixed tube 2 near its opening. The outer circle of the sealing ring 7 is sealed to the fixed tube 2 through the annular sealing groove.

[0050] The annular sealing groove provides positioning and radial constraint for the sealing ring 7. During installation, the outer circle of the sealing ring is embedded in the groove to prevent it from shifting under radial force.

[0051] Specifically, such as Figure 3 As shown, the outer surface of the ball head of the sealing joint 5 has a leak-proof layer 12, and the leak-proof layer 12 is seamlessly fitted to the ball surface 6;

[0052] The leak-proof layer 12 is made of fluororubber, which has a wide temperature range performance of -40℃ to 150℃, and a low coefficient of friction. The long-term wear is <0.01mm / year, making it suitable for scenarios where the coolant temperature fluctuates frequently during battery charging and discharging.

[0053] Moreover, the fluororubber layer has excellent chemical corrosion resistance and can resist the erosion of components such as ethylene glycol and additives in the coolant. Experiments show that after soaking in a 10% ethylene glycol solution for 1000 hours, the performance retention rate of the leak-proof layer is >95%, which is significantly better than that of traditional nitrile rubber seals.

[0054] Specifically, such as Figure 3 As shown, the axes of the connecting seat 1, the fixing pipe 2, the sealing joint 5, the connecting pipe 3, and the infusion pipe 4 coincide and are connected in sequence;

[0055] The coaxial design with a coaxiality of ≤0.1mm avoids unilateral wear of the sealing ring caused by eccentric loads. For example, when the connecting pipe 3 is subjected to a radial force of 50N, the coaxial structure makes the sealing ring 7 uniformly pressurized, reducing the wear by 60% compared to the non-coaxial design and extending the service life of the sealing assembly.

[0056] Specifically, such as Figure 2 and Figure 3 As shown, the diameter of the fixing ring 8 is the same as the diameter of the fixing tube 2. The locking cover 9 is an annular cover and is fitted on the end of the connecting tube 3 away from the fixing tube 2. The open end of the locking cover 9 is threadedly connected to the open end of the fixing tube 2, and the fixing ring 8 is in close contact with the inner wall end face of the locking cover 9.

[0057] The annular structure of the retaining ring 8 and the locking cover 9 provides uniform axial clamping force, while facilitating disassembly and assembly, significantly improving maintenance convenience.

[0058] During assembly, the sealing joint 5 is first inserted into the inside of the guide fixing tube 2, so that the leak-proof layer 12 is tightly attached to the spherical surface 6. Then, the sealing ring 7 is bent and deformed and placed into the fixing tube 2 and aligned with the annular sealing groove, so that the outer circle of the sealing ring 7 is engaged with the annular sealing groove. The sealing lip 11 of the inner ring of the sealing ring 7 is fitted onto the annular lip on the outer circumference of the connecting tube 10. At this time, the sealing ring 7 returns to its original shape. Then, the connecting tube 3 is rotated and inserted into the fixing tube 2, so that the connecting tube 3 is threadedly connected to the connecting tube 10. The fixing ring 8 is then attached to the open end face of the fixing tube 2. Then, the locking cap 9 is threaded onto the outside of the open end of the fixing tube 2, so that the fixing ring 8 is clamped, thereby completing the installation and fixing of the connecting tube 3.

[0059] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A sealing pipe structure for a battery cooling plate of a new energy vehicle, comprising a connecting seat (1) installed at the coolant inlet and outlet of the battery cooling plate (13), a fixing pipe (2) installed at the open end of the connecting seat (1), and the open end of the fixing pipe (2) being connected to a liquid delivery pipe (4) through a connecting pipe (3), characterized in that: The end of the connecting tube (3) away from the infusion tube (4) extends into the fixed tube (2) and is equipped with a sealing joint (5). The inner wall of the fixed tube (2) near the connecting seat (1) has a spherical surface (6). The free end of the sealing joint (5) is a ball head and is in close contact with the spherical surface (6). The end of the sealing joint (5) near the connecting pipe (3) is sealed to the inner wall of the fixed pipe (2) through the sealing ring (7); The outer periphery of the connecting tube (3) is fitted with a fixing ring (8), which is in close contact with the open end face of the fixing tube (2) and is locked to the fixing tube (2) by a locking cap (9).

2. The new energy vehicle battery cooling plate connecting sealing pipe structure according to claim 1, characterized in that, The sealing joint (5) has a connecting pipe (10) installed at one end near the connecting pipe (3), and the sealing ring (7) is fitted on the outer circumference of the connecting pipe (10), and the connecting pipe (10) and the connecting pipe (3) are threaded together.

3. The new energy vehicle battery cooling plate connecting sealing pipe structure according to claim 2, characterized in that, The diameter of the connecting pipe (3) and the sealing joint (5) is the same and larger than the inner diameter of the sealing ring (7). The sealing ring (7) is fitted into the annular groove formed between the connecting pipe (3), the connecting pipe (10), and the sealing joint (5).

4. The new energy vehicle battery cooling plate connecting sealing pipe structure according to claim 2, characterized in that, The outer periphery of the connecting tube (10) is provided with an annular lip that is centered, and the inner wall of the sealing ring (7) has a sealing lip (11) that is adapted to the annular lip, and the sealing lip (11) is seamlessly connected to the connecting tube (10) through the annular lip.

5. The new energy vehicle battery cooling plate connecting sealing pipe structure according to claim 1, characterized in that, The inner wall of the fixed tube (2) near its opening is provided with an annular sealing groove that is compatible with the sealing ring (7). The outer circle of the sealing ring (7) is sealed to the fixed tube (2) through the annular sealing groove.

6. The new energy vehicle battery cooling plate connecting sealing pipe structure according to claim 1, characterized in that, The outer surface of the ball head of the sealing joint (5) has a leak-proof layer (12), and the leak-proof layer (12) fits seamlessly with the ball surface (6).

7. The new energy vehicle battery cooling plate connecting sealing pipe structure according to claim 5, characterized in that, The leak-proof layer (12) is a fluororubber layer.

8. The new energy vehicle battery cooling plate connecting sealing pipe structure according to claim 1, characterized in that, The axes of the connecting seat (1), the fixing tube (2), the sealing joint (5), the connecting tube (3), and the infusion tube (4) coincide and are connected in sequence.

9. The new energy vehicle battery cooling plate connecting sealing pipe structure according to claim 1, characterized in that, The diameter of the fixing ring (8) is the same as that of the fixing tube (2). The locking cover (9) is an annular cover and is fitted on the end of the connecting tube (3) away from the fixing tube (2). The opening end of the locking cover (9) is threadedly connected to the opening end of the fixing tube (2), and the fixing ring (8) is in close contact with the inner wall end face of the locking cover (9).

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