An internally threaded elbow brazed cold plate joint and method of assembly thereof

Abstract

The application discloses a female threaded elbow brazing cold plate joint and an assembling method thereof, and belongs to the technical field of thermal management of energy storage batteries. The female threaded elbow brazing cold plate joint comprises an elbow and a female threaded sleeve. One end of the elbow is brazed on a cold plate and communicates with a cooling flow channel on the cold plate, and the other end of the elbow is brazed with the female threaded sleeve. The cold plate joint has the advantages that the internal flow channel of the elbow adopts smooth transition, large-curvature slow turning and non-reducing design, fluid sharp turning points, vortexes and air resistance can be reduced, the pressure drop is reduced, the risk of joint loosening, cracking or damage is reduced, an optimized sealing surface structure, multiple sealing mechanisms and stress buffering design are adopted, stable sealing of the joint under high-low temperature cycles and long-term vibration environment is realized, cooling liquid leakage is avoided, and the long-term operation safety and reliability of the system are improved. The problems of existing cold plate joints, such as easy leakage of cooling liquid during long-term operation, loosening and cracking of the interface, and substandard cooling efficiency of the liquid cooling full-area heat dissipation are solved.

Description

Technical Field

[0001] This invention relates to the field of thermal management technology for energy storage batteries, and in particular to a brazed cold plate joint with internal threaded bend and its assembly method. Background Technology

[0002] Energy storage batteries are transforming from a "supporting role" to the core of energy systems. Lithium batteries are undergoing continuous iteration, while sodium batteries and long-duration technologies are filling the gaps, jointly supporting the global energy transition. The next five years will be a critical window of opportunity for both scale and performance improvement.

[0003] Among them, the cold plate joint with simple process and high yield is mainly based on pipe bending + pressing / embedding, with less complex welding, fewer defects and high yield. It has the characteristics of efficient heat dissipation, high reliability, strong adaptability and low cost process, and has become the mainstream choice for large-capacity energy storage, long cycle and high safety scenarios. It is especially suitable for large cell liquid cooling, container energy storage and high power density projects.

[0004] However, existing cold plate joints cannot effectively overcome the reliability shortcomings of stress concentration at the bend joint points under combined working conditions, insufficient sealing and pressure bearing stability, and easy occurrence of coolant leakage, loosening and cracking of the interface during long-term operation. Furthermore, they cannot improve the core problems of high fluid pressure drop, eddy current stagnation, uneven heat exchange flow distribution, and substandard liquid cooling temperature control performance caused by unreasonable internal flow channel structure of traditional joints. Summary of the Invention

[0005] The purpose of this invention is to provide a brazed cold plate joint for an internally threaded bent pipe and its assembly method. The internal flow channel of the bent pipe adopts a smooth transition, large curvature gentle turn and no diameter reduction design, which can reduce the fluid sharp turning points, eddies and air resistance, reduce pressure drop, and reduce the risk of joint loosening, cracking or damage. It adopts an optimized sealing surface structure, multiple sealing mechanisms and stress buffer design to achieve stable sealing of the joint under high and low temperature cycle and long-term vibration environment, avoid coolant leakage, and improve the long-term operation safety and reliability of the system, so as to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] A brazed cold plate joint with an internally threaded bend is installed on a cold plate and communicates with a cooling channel on the cold plate. It includes a bend and an internally threaded sleeve. One end of the bend is brazed to the cold plate and communicates with a cooling channel on the cold plate. The other end of the bend is brazed with the internally threaded sleeve. A support is provided on the surface of the cold plate, and the internally threaded sleeve is provided on the support. The surface of the support is an arc-shaped surface that fits against the outer wall of the internally threaded sleeve. The support is used to support the internally threaded sleeve.

[0008] Specifically, one end of the bend is brazed to the cold plate and connected to the cooling channel on the cold plate, while the other end of the bend is brazed to an internal threaded sleeve, achieving a 100% welding rate. This reduces the complexity of one-piece processing while ensuring airtightness.

[0009] Furthermore, the support is provided with a first through hole and a second through hole, which can reduce the weight of the support, thereby reducing the weight of the internal threaded bend brazed cold plate joint.

[0010] Furthermore, the bend includes an arc-shaped pipe, a first straight pipe, and a second straight pipe. One end of the arc-shaped pipe is connected to the first straight pipe, and the other end of the arc-shaped pipe is connected to the second straight pipe. The internal flow channel of the bend adopts a smooth transition, large curvature gentle turn, and no diameter reduction design, which can reduce the fluid sharp turning points, eddies, and air resistance, significantly reduce pressure drop, and effectively resist fatigue loads caused by long-term charge and discharge cycles, thermal cycles, and mechanical vibrations of the energy storage system, reduce the risk of joint loosening, cracking, or damage, and extend the overall life cycle of the system.

[0011] Furthermore, the first straight tube is connected to the inner side of the internally threaded sleeve, and the second straight tube is provided with a positioning boss. The second straight tube is brazed to the cold plate through the positioning boss. The end of the second straight tube enters the cold plate and the positioning boss is located on the surface of the cold plate. A positioning groove for installing the second straight tube is opened on the surface of the cold plate.

[0012] Specifically, when the second straight pipe of the bend is installed on the cold plate, the positioning boss is in contact with the surface of the cold plate, and the second straight pipe is brazed on the cold plate with a 100% welding rate. This saves the complexity of one-piece processing and ensures airtightness. The contact between the positioning boss and the surface of the cold plate can ensure the airtightness between the bend and the cold plate.

[0013] Furthermore, the inner wall of the internally threaded sleeve is provided with a positioning ring. When the first straight tube is connected to the inner side of the internally threaded sleeve, the first straight tube is in contact with the positioning ring. The positioning ring positions and fits the first straight tube. The positioning ring is ring-shaped, and the inner diameter of the positioning ring is the same as the inner diameter of the first straight tube, and the outer diameter of the positioning ring is the same as the outer diameter of the first straight tube.

[0014] Specifically, when the first straight pipe of the bend is installed inside the internal threaded sleeve, the end of the first straight pipe is in contact with the positioning ring provided on the inner wall of the internal threaded sleeve, and the first straight pipe is brazed inside the internal threaded sleeve, with a welding rate of 100%. This saves the complexity of one-piece processing and ensures airtightness. When the first straight pipe is in contact with the positioning ring, the airtightness between the bend and the internal threaded sleeve can be guaranteed.

[0015] Furthermore, the inner side of one end of the internally threaded sleeve is provided with an internally threaded groove, and the end of the internally threaded sleeve is provided with a stepped groove.

[0016] According to another aspect of the present invention, an assembly method for a brazed cold-plate joint for an internally threaded bend pipe as described above is provided, comprising the following steps:

[0017] S1: Install the second straight pipe in the positioning groove opened on the surface of the cold plate, so that the positioning boss provided on the outer wall of the second straight pipe is located on the surface of the cold plate and the positioning boss is in contact with the surface of the cold plate. The second straight pipe is brazed onto the cold plate by brazing.

[0018] S2: Install the first straight tube inside the internal threaded sleeve, and make the first straight tube fit against the positioning ring provided on the inner wall of the internal threaded sleeve. Braze the first straight tube onto the internal threaded sleeve.

[0019] S3: Connect the internal threaded sleeve to the arc-shaped surface of the support, and connect the support to the cold plate.

[0020] Compared with the prior art, the beneficial effects of the present invention are:

[0021] The internal threaded bend brazed cold plate joint of the present invention features a smooth transition, large curvature, and no diameter reduction design in the internal flow channel of the bend. This reduces abrupt fluid bends, eddies, and air resistance, significantly lowering pressure drop. It also effectively resists fatigue loads caused by long-term charge-discharge cycles, thermal cycles, and mechanical vibrations in energy storage systems, reducing the risk of joint loosening, cracking, or damage, and extending the overall system lifespan. Furthermore, when one end of the bend is mounted on the cold plate, the positioning boss fits snugly against the surface of the cold plate, and the bend is brazed to the cold plate. The other end of the bend is mounted on... When the bend is inserted into the internal threaded sleeve, the end of the bend fits against the positioning ring on the inner wall of the internal threaded sleeve, and the bend is brazed into the internal threaded sleeve, achieving a 100% welding rate. This reduces the complexity of one-piece processing while ensuring airtightness. The optimized sealing surface structure, multiple sealing mechanisms, and stress buffer design effectively absorb stress concentration caused by thermal expansion and contraction, vibration, and pipeline deformation, achieving stable sealing of the joint under high and low temperature cycles and long-term vibration environments. This prevents coolant leakage and improves the long-term safety and reliability of the system. Attached Figure Description

[0022] Figure 1 A top view of the cold plate with an internally threaded bent pipe brazed cold plate joint according to the present invention;

[0023] Figure 2 A bottom view of the cold plate with an internally threaded bent pipe brazed cold plate joint according to the present invention;

[0024] Figure 3 For the present invention Figure 1 Enlarged view of point A in the image;

[0025] Figure 4 For the present invention Figure 3 A top-view cross-section;

[0026] Figure 5 For the present invention Figure 3 A cross-sectional bottom view;

[0027] Figure 6 This is a cross-sectional view of the bent pipe of the present invention;

[0028] Figure 7 This is a left cross-sectional view of the internal threaded sleeve of the present invention;

[0029] Figure 8 This is a right-side cross-sectional view of the internal threaded sleeve of the present invention;

[0030] Figure 9 This is a schematic diagram of the support structure of the present invention;

[0031] Figure 10 This is a side view of the support of the present invention.

[0032] In the diagram: 1. Cold plate; 11. Cooling channel; 2. Bend; 21. Arc-shaped pipe; 22. First straight pipe; 23. Second straight pipe; 231. Positioning boss; 3. Internal threaded sleeve; 31. Positioning ring; 4. Support; 41. First through hole; 42. Second through hole. Detailed Implementation

[0033] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0034] To address the problems of existing cold plate joints, such as easy coolant leakage, loosening and cracking of the joints during long-term operation, high fluid pressure drop, eddy current stagnation, uneven heat exchange flow distribution, and substandard overall liquid cooling temperature control performance, this embodiment provides the following technical solution:

[0035] Please see Figures 1-5 A brazed cold plate joint with internal threaded bend pipe is installed on a cold plate 1 and communicates with a cooling channel 11 on the cold plate 1, including a bend pipe 2, an internal threaded sleeve 3 and a support 4.

[0036] Support 4 is set on the surface of cold plate 1, and internal thread sleeve 3 is provided on support 4. Internal thread sleeve 3 is connected to bend 2, and bend 2 is installed on cold plate 1.

[0037] It should be noted that the surface of the support 4 is an arc-shaped surface, which fits against the outer wall of the internal threaded sleeve 3 to support the internal threaded sleeve 3.

[0038] Please see Figures 9-10 The support 4 is provided with a first through hole 41 and a second through hole 42. By opening the hollow first through hole 41 and second through hole 42 on the support 4, the weight of the support 4 can be reduced, thereby reducing the weight of the brazed cold plate joint of the internal threaded bend pipe.

[0039] Specifically, one end of the bend 2 is brazed onto the cold plate 1 and connected to the cooling channel 11 on the cold plate 1, while the other end of the bend 2 is brazed onto the internal thread sleeve 3, which saves the complexity of one-piece processing and ensures airtightness.

[0040] Please see Figure 6 The bend 2 includes an arc-shaped pipe 21, a first straight pipe 22, and a second straight pipe 23. One end of the arc-shaped pipe 21 is connected to the first straight pipe 22, and the other end of the arc-shaped pipe 21 is connected to the second straight pipe 23. The first straight pipe 22 is connected to the inside of the internally threaded sleeve 3.

[0041] Specifically, the internal flow channel of bend 2 adopts a smooth transition, large curvature gentle turn and no diameter reduction design, which can reduce the fluid sharp turning points, eddies and air resistance, significantly reduce pressure drop, and effectively resist fatigue loads caused by long-term charge and discharge cycles, thermal cycles and mechanical vibrations of the energy storage system, reduce the risk of joint loosening, cracking or damage, and extend the overall life cycle of the system.

[0042] Please see Figures 7-8 The inner wall of the internal threaded sleeve 3 is provided with a positioning ring 31. When the first straight tube 22 is connected to the inner side of the internal threaded sleeve 3, the first straight tube 22 is in contact with the positioning ring 31, and the positioning ring 31 positions and contacts the first straight tube 22.

[0043] It should be noted that when the first straight pipe 22 of the bend 2 is installed in the internal threaded sleeve 3, the end of the first straight pipe 22 is in contact with the positioning ring 31 provided on the inner wall of the internal threaded sleeve 3, and the first straight pipe 22 is brazed in the internal threaded sleeve 3 with a welding rate of 100%, which saves the complexity of integrated processing and ensures airtightness.

[0044] The positioning ring 31 is ring-shaped, and the inner diameter of the positioning ring 31 is the same as the inner diameter of the first straight pipe 22, and the outer diameter of the positioning ring 31 is the same as the outer diameter of the first straight pipe 22.

[0045] It should be noted that when the first straight pipe 22 is in contact with the positioning ring 31, the airtightness between the bent pipe 2 and the internal threaded sleeve 3 can be guaranteed.

[0046] The second straight tube 23 is provided with a positioning boss 231. The second straight tube 23 is brazed to the cold plate 1 through the positioning boss 231. The end of the second straight tube 23 enters the cold plate 1 and the positioning boss 231 is located on the surface of the cold plate 1. A positioning groove for installing the second straight tube 23 is opened on the surface of the cold plate 1.

[0047] It should be noted that when the second straight pipe 23 of the bend 2 is installed on the cold plate 1, the positioning boss 231 is in contact with the surface of the cold plate 1, and the second straight pipe 23 is brazed on the cold plate 1 with a welding rate of 100%. This saves the complexity of the one-piece processing and ensures airtightness. The contact between the positioning boss 231 and the surface of the cold plate 1 can ensure the airtightness between the bend 2 and the cold plate 1.

[0048] The inner side of one end of the internal threaded sleeve 3 is provided with an internal thread groove, and the end of the internal threaded sleeve 3 is provided with a stepped groove, which facilitates the connection and use of the internal threaded sleeve 3.

[0049] To better illustrate the assembly process of a brazed cold-plate joint for an internally threaded bend pipe, this embodiment provides an assembly method for such a joint as described above, comprising the following steps:

[0050] S1: Install the second straight tube 23 in the positioning groove opened on the surface of the cold plate 1, so that the positioning boss 231 provided on the outer wall of the second straight tube 23 is located on the surface of the cold plate 1, and the positioning boss 231 is in contact with the surface of the cold plate 1. The second straight tube 23 is brazed onto the cold plate 1 by brazing.

[0051] S2: Install the first straight tube 22 inside the internal threaded sleeve 3, and make the first straight tube 22 fit with the positioning ring 31 provided on the inner wall of the internal threaded sleeve 3, and braze the first straight tube 22 onto the internal threaded sleeve 3 by brazing.

[0052] S3: Connect the internal threaded sleeve 3 to the arc-shaped surface of the support 4, and connect the support 4 to the cold plate 1.

[0053] It should be noted that, following the above assembly method, the brazed cold plate joint of the internal threaded bend pipe is assembled on the cold plate 1. The final installation meets the requirements, and the entire package passes through airtightly without any impact or adverse effects.

[0054] In summary, the internal threaded bend brazed cold plate joint proposed in this invention features a smooth transition, large curvature, and no diameter reduction design in the internal flow channel of the bend 2. This reduces abrupt fluid bends, eddies, and air resistance, significantly lowering pressure drop. Furthermore, it effectively resists fatigue loads caused by long-term charge-discharge cycles, thermal cycles, and mechanical vibrations in the energy storage system, reducing the risk of joint loosening, cracking, or damage, and extending the overall system lifespan. Simultaneously, when one end of the bend 2 is mounted on the cold plate 1, the positioning boss 231 fits against the surface of the cold plate 1, and the bend 2 is brazed onto the cold plate 1. The other end of the bend 2... When the end is installed inside the internal threaded sleeve 3, the end of the bend 2 fits against the positioning ring 31 provided on the inner wall of the internal threaded sleeve 3, and the bend 2 is brazed into the internal threaded sleeve 3, with a welding rate of 100%. This saves the complexity of integrated processing and ensures airtightness. By adopting an optimized sealing surface structure, multiple sealing mechanisms and stress buffer design, it can effectively absorb the stress concentration caused by thermal expansion and contraction, vibration and pipeline deformation, and achieve stable sealing of the joint under high and low temperature cycles and long-term vibration environment, avoid coolant leakage, and improve the long-term operation safety and reliability of the system.

[0055] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A brazed cold plate joint for an internally threaded bent pipe, mounted on a cold plate (1) and connected to a cooling channel (11) on the cold plate (1), characterized in that, It includes a bent pipe (2) and an internally threaded sleeve (3). One end of the bent pipe (2) is brazed onto a cold plate (1) and connected to a cooling channel (11) on the cold plate (1). The other end of the bent pipe (2) is brazed onto an internally threaded sleeve (3).

2. The brazed cold-plate joint for an internally threaded bent pipe according to claim 1, characterized in that, The surface of the cold plate (1) is provided with a support (4), and the support (4) is provided with an internal threaded sleeve (3). The surface of the support (4) is an arc-shaped surface that fits against the outer wall of the internal threaded sleeve (3). The support (4) is used to support the internal threaded sleeve (3).

3. The brazed cold-plate joint for an internally threaded bent pipe according to claim 1, characterized in that, The bend (2) includes an arc-shaped pipe (21), a first straight pipe (22), and a second straight pipe (23). One end of the arc-shaped pipe (21) is connected to the first straight pipe (22), and the other end of the arc-shaped pipe (21) is connected to the second straight pipe (23).

4. The brazed cold-plate joint for an internally threaded bent pipe according to claim 3, characterized in that, The first straight tube (22) is connected to the inner side of the internal threaded sleeve (3). The second straight tube (23) is provided with a positioning boss (231). The second straight tube (23) is brazed to the cold plate (1) through the positioning boss (231). The end of the second straight tube (23) enters the cold plate (1) and the positioning boss (231) is located on the surface of the cold plate (1). A positioning groove for the installation of the second straight tube (23) is opened on the surface of the cold plate (1).

5. A cold-plate brazed joint for an internally threaded bent pipe according to claim 4, characterized in that, The inner wall of the internal threaded sleeve (3) is provided with a positioning ring (31). When the first straight tube (22) is connected to the inner side of the internal threaded sleeve (3), the first straight tube (22) is in contact with the positioning ring (31), and the positioning ring (31) positions and fits the first straight tube (22).

6. A cold-plate brazed joint for an internally threaded bent pipe according to claim 5, characterized in that, The positioning ring (31) is ring-shaped, and the inner diameter of the positioning ring (31) is the same as the inner diameter of the first straight pipe (22), and the outer diameter of the positioning ring (31) is the same as the outer diameter of the first straight pipe (22).

7. A cold-plate brazed joint for an internally threaded bend pipe according to claim 1, characterized in that, The inner side of one end of the internal threaded sleeve (3) is provided with an internal thread groove, and the end of the internal threaded sleeve (3) is provided with a stepped groove.

8. A cold-plate brazed joint for an internally threaded bend pipe according to claim 7, characterized in that, The support (4) is provided with a first through hole (41) and a second through hole (42).

9. An assembly method for a brazed cold-plate joint for an internally threaded bent pipe as described in claim 8, characterized in that, Includes the following steps: S1: Install the second straight tube (23) in the positioning groove opened on the surface of the cold plate (1), so that the positioning boss (231) provided on the outer wall of the second straight tube (23) is located on the surface of the cold plate (1), and the positioning boss (231) is in contact with the surface of the cold plate (1). The second straight tube (23) is brazed onto the cold plate (1) by brazing. S2: Install the first straight tube (22) inside the internal threaded sleeve (3) and make the first straight tube (22) fit against the positioning ring (31) provided on the inner wall of the internal threaded sleeve (3). Braze the first straight tube (22) onto the internal threaded sleeve (3) by brazing. S3: Connect the internal threaded sleeve (3) to the arc surface of the support (4) and connect the support (4) to the cold plate (1).

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