Liquid cooling plate assembly of pre-embedded welding ring

Abstract

The utility model relates to the field of new energy battery processing, in particular to a liquid cooling plate assembly with an embedded welding ring, which comprises a connecting pipe and a liquid cooling plate, the welding ring is arranged between the connecting pipe and the liquid cooling plate, and the melting point of the welding ring is lower than that of the connecting pipe and that of the liquid cooling plate so as to weld the connecting pipe and the liquid cooling plate. The cold plate has the advantages that the cold plate is not limited by the structure of the connecting pipe, the welding filling area can be well guaranteed, the welding rate between the connecting pipe and the cold plate is greatly increased, and the welding quality of products is guaranteed.

Description

Technical Field

[0001] The present application relates to the field of new energy battery processing, and in particular to a liquid cooling plate assembly with pre-embedded welding rings. Background Art

[0002] As an irreplaceable core of new energy vehicles, the battery has seen increasing R & D investment to ensure the core competitiveness of new energy vehicles. However, due to the problems of poor heat dissipation performance and large temperature influence of the battery, strengthening the research on the heat dissipation performance of the battery is of great significance for ensuring the safety of the battery and optimizing the power battery heat management system.

[0003] The battery management system is an important part of realizing the effective connection between the vehicle and the battery, and has a direct impact on the performance of the vehicle. The battery management system includes a thermal management system for managing the battery temperature. Multiple batteries are combined to form a battery pack. As an important component of the thermal management system in the battery pack, the liquid cooling plate has a complex manufacturing process and high precision requirements. The main welding process is brazing. The principle of brazing is to set a certain temperature through the melting point difference of different materials to reach the melting point of the solder, so that the solder melts and performs capillary filling to connect the base materials. Therefore, the melting points of the parts in the liquid cooling plate product should not vary too much and the thicknesses should be similar.

[0004] However, with the gradual diversification of the structure of the liquid cooling plate, the requirements for the welding process are getting higher and higher. At the same time, in response to the call for cost reduction, the inlet and outlet water port structures of the battery pack are directly integrated into the liquid cooling plate. In this way, the connecting pipes on the liquid cooling plate directly serve as the inlet and outlet water ports. However, this also requires that the structure must ensure strength, and the overall structure must be designed more three-dimensionally, with high quality and high thickness. Although the structural strength can be satisfied, it greatly increases the manufacturing process difficulty of this type of liquid cooling plate. This heavy connecting pipe will absorb a large amount of heat during the brazing process, resulting in the melting point temperature of the solder not being reached, and ultimately leading to welding failure. Summary of the Utility Model

[0005] To solve the above problems, the present application provides a liquid cooling plate assembly with pre-embedded welding rings.

[0006] The liquid cooling plate assembly with pre-embedded welding rings provided by the present application adopts the following technical solutions:

[0007] A liquid cooling plate assembly with pre-embedded welding rings includes a connecting pipe and a liquid cooling plate. A welding ring is arranged between the connecting pipe and the liquid cooling plate. The melting point of the welding ring is lower than the melting points of the connecting pipe and the liquid cooling plate to weld the connecting pipe and the liquid cooling plate.

[0008] By adopting the above technical solution, when the welding ring is pre-buried between the connecting pipe and the liquid cooling plate and then brazed and melted, the melting of the welding ring can more easily absorb and concentrate heat, and better ensure capillary filling between the welding surfaces of the connecting pipe and the liquid cooling plate, ensure the welding filling area, improve the welding rate between the connecting pipe and the liquid cooling plate, and ensure the welding quality of the product.

[0009] Optionally, a positioning structure is provided on the side wall of the connecting pipe for contacting the liquid cooling plate. An inlet / outlet channel for liquid inlet or outlet is provided on the connecting pipe, and the positioning structure is used to position the welding ring.

[0010] By adopting the above technical solution, the position of the welding ring is positioned by the positioning structure, reducing the probability that the position of the welding ring shifts during the transfer of the connecting pipe and the liquid cooling plate, thereby affecting the welding filling position, improving the stability of brazing, and ensuring the welding quality of the product.

[0011] Optionally, the welding ring includes an inner welding ring, and the inner welding ring circumferentially surrounds an opening surface of one of the inlet / outlet channels.

[0012] By adopting the above technical solution, through the inner welding ring, the inner wall of the opening surface of the inlet / outlet channel is welded during melting, and the edge position of the inlet / outlet channel is better welded, making it easier for the solder to flow to the edge position of the opening surface of the inlet / outlet channel, reducing the probability of welding defects such as weld seams and false soldering at the opening surface of the inlet / outlet channel on the connecting pipe, improving the airtightness of the product, and reducing the probability of airtight failure of the product.

[0013] Optionally, the positioning structure includes an inner ring groove, and the inner ring groove circumferentially surrounds an opening surface of one of the inlet / outlet channels. The inner ring groove is used for the inner welding ring to be buried therein for making way.

[0014] By adopting the above technical solution, the position of the inner welding ring is limited and fixed by the inner ring groove, and at the same time, it also makes way for the inner welding ring, reducing the probability that the inner welding ring hinders the fitting between the connecting pipe and the liquid cooling plate and cannot be fully fitted, and reducing the interference effect of the pre-buried inner welding ring on the fitting between the connecting pipe and the liquid cooling plate.

[0015] Optionally, the inner ring groove is communicated with the opening surface of the inlet / outlet channel.

[0016] By adopting the above technical solution, when the inner welding ring melts, capillary filling enters the inner wall of the inner ring groove, and at the same time, the opening surface of the inlet / outlet channel is directly welded and sealed, reducing the fluid in the inlet / outlet channel from entering between the side wall of the connecting pipe and the side wall of the liquid cooling plate during circulation, and better achieving airtightness.

[0017] Optionally, the welding ring includes an outer welding ring, and the outer welding ring circumferentially surrounds the opening surfaces of a plurality of the liquid inlet and outlet channels together.

[0018] By adopting the above technical solution, the outer welding ring surrounds the outside of the opening surfaces of all the liquid inlet and outlet channels, so that when the outer welding ring melts, capillary filling welding can be performed on the outer rings of the opening surfaces of all the liquid inlet and outlet channels, realizing two sealing welds between the fluid in the liquid inlet and outlet channels and the external environment, and further improving the airtightness.

[0019] Optionally, the positioning structure includes an outer ring groove, and the outer ring groove circumferentially surrounds the opening surfaces of a plurality of the liquid inlet and outlet channels. The outer ring groove is used for embedding the outer welding ring therein for making way.

[0020] By adopting the above technical solution, the position of the outer welding ring is limited and fixed by the outer ring groove, and at the same time, the outer welding ring is also made to give way, reducing the probability that the outer welding ring hinders the fitting between the connecting pipe and the liquid cooling plate and cannot be completely fitted, and reducing the interference effect of the pre-embedded outer welding ring on the fitting between the connecting pipe and the liquid cooling plate; also, when the outer welding ring melts in the outer ring groove, it is capillary filled between the inner side wall of the outer ring groove and the liquid cooling plate, and also filled between the outer side wall of the outer ring groove and the liquid cooling plate, stipulating the filling position after the solder melts, realizing better filling, ensuring the welding filling position, improving the welding rate, and ensuring the welding quality of the product.

[0021] Optionally, the outer ring groove is close to the connecting pipe and is used for the edge of the side wall of the liquid cooling plate.

[0022] By adopting the above technical solution, through the outer welding ring, the inner wall of the outer ring groove is welded when melting, thus realizing better welding of the edge position of the contact surface between the connecting pipe and the liquid cooling plate, making the solder easier to flow to the edge position of the contact surface between the connecting pipe and the liquid cooling plate, reducing the probability of welding defects such as weld seams and false soldering at the edge position of the contact surface between the connecting pipe and the liquid cooling plate, improving the airtightness of the product, and reducing the probability of airtight failure of the product; by selecting a suitable pre-embedding method for the outer ring groove and the outer welding ring, the pre-embedding of the welding ring can be unrestricted by the structure of the connecting pipe, better ensuring the filling area and position of the welding.

[0023] In summary, the present application includes at least one of the following beneficial technical effects:

[0024] 1. The solder is more likely to absorb and concentrate heat and is not prone to weld seams and false soldering;

[0025] 2. It is possible to select a suitable pre-embedding method according to the bottom structure of the connecting pipe, which is not restricted by the structure of the connecting pipe, can well ensure the welding filling area, greatly improve the welding rate between the connecting pipe and the cold plate, and ensure the welding quality of the product. Description of the Drawings

[0026] Figure 1 It is a schematic diagram of the overall structure of a liquid-cooled plate assembly with a pre-embedded welding ring in an embodiment of the present application.

[0027] Figure 2 It is an exploded structure diagram highlighting the positioning structure.

[0028] Description of the reference numerals: 1, connecting pipe; 11, liquid inlet and outlet channels; 2, liquid-cooled plate; 3, welding ring; 31, inner welding ring; 32, outer welding ring; 4, positioning structure; 41, inner ring groove; 42, outer ring groove. Detailed Description of the Embodiment

[0029] The following further describes the present application in detail with reference to the attached Figure 1-2 drawings.

[0030] An embodiment of the present application discloses a liquid-cooled plate assembly with a pre-embedded welding ring. Referring to Figure 1 and Figure 2 , the liquid-cooled plate assembly with a pre-embedded welding ring includes a connecting pipe 1 and a liquid-cooled plate 2. For convenience of description, the surface where the connecting pipe 1 contacts the liquid-cooled plate 2 is called the welding surface. A positioning structure 4 is provided on the welding surface of the connecting pipe 1, and a welding ring 3 is pre-embedded in the positioning structure 4, that is, the welding ring 3 is pre-embedded in the welding surface of the connecting pipe 1, and the welding ring 3 is located between the welding surface of the connecting pipe 1 and the liquid-cooled plate 2. The melting point of the welding ring 3 is lower than that of the connecting pipe 1 and the liquid-cooled plate 2. When the temperature reaches the melting point, the welding ring 3 melts to perform capillary filling on the welding surface of the connecting pipe 1 and the liquid-cooled plate 2, so as to perform brazing welding on the connecting pipe 1 and the liquid-cooled plate 2.

[0031] Referring to Figure 2 , a plurality of liquid inlet and outlet channels 11 are provided on the connecting pipe 1. In this embodiment, the number of the liquid inlet and outlet channels 11 is two. Usually, when in use, one liquid inlet and outlet channel 11 is used for liquid inlet, and the other liquid inlet and outlet channel 11 is used for liquid outlet, and both liquid inlet and outlet channels 11 have open surfaces on the welding surface of the connecting pipe 1. In other embodiments, the number of the liquid inlet and outlet channels 11 and the uses of liquid inlet or outlet can be adjusted according to requirements or specifications. For example, the number of the liquid inlet and outlet channels 11 can be three, one of which is used for liquid inlet and two are used for liquid outlet.

[0032] Referring to Figure 2, the positioning structure 4 includes an inner annular groove 41 and an outer annular groove 42. The number of the inner annular grooves 41 corresponds to the number of the opening surfaces of the liquid inlet and outlet channels 11 on the welding surface of the connecting pipe 1. That is, in this embodiment, the number of the inner annular grooves 41 is two. The inner annular grooves 41 are circumferentially arranged around the opening surfaces of the liquid inlet and outlet channels 11 on the welding surface of the connecting pipe 1, and the inner circle of the inner annular groove 41 is communicated with the outer circle of the opening surface of the liquid inlet and outlet channel 11. The inner annular groove 41 is countersunk. The outer annular groove 42 circumferentially surrounds all the opening surfaces of the liquid inlet and outlet channels 11 opened on the welding surface of the connecting pipe 1, that is, the opening surfaces of the two liquid inlet and outlet channels 11 are both inside the circumferential surrounding area of the same outer annular groove 42, and the outer annular groove 42 is close to the edge of the welding surface of the connecting pipe 1.

[0033] Refer to Figure 2 , the welding ring 3 includes an inner welding ring 31 and an outer welding ring 32. The number of the inner welding rings 31 corresponds to the number of the inner annular grooves 41, and the inner welding rings 31 and the inner annular grooves 41 are in one-to-one correspondence. The outer welding rings 32 and the outer annular grooves 42 are in one-to-one correspondence. The inner welding ring 31 is embedded in the inner annular groove 41, and the cross-sectional diameter of the inner welding ring 31 is smaller than the depth of the inner annular groove 41 to ensure that the inner welding ring 31 is completely embedded in the inner annular groove 41, so that the welding surface of the connecting pipe 1 and the welding surface of the liquid cooling plate 2 can be fitted. The inner diameter of the inner circle of the inner welding ring 31 is greater than or equal to the diameter of the opening surface of the liquid inlet and outlet channel 11. The outer welding ring 32 is embedded in the outer annular groove 42, and the cross-sectional diameter of the outer welding ring 32 is smaller than the depth of the outer annular groove 42 to ensure that the outer welding ring 32 is completely embedded in the outer annular groove 42.

[0034] The implementation principle of the liquid cooling plate assembly with pre-embedded welding rings in the embodiment of the present application is as follows: When it is necessary to weld the connecting pipe 1 and the liquid cooling plate 2, the inner welding ring 31 is pre-embedded into the inner annular groove 41, and the outer welding ring 32 is pre-embedded into the outer annular groove 42. Then, the welding surface of the connecting pipe 1 and the welding surface of the liquid cooling plate 2 are fitted and positioned and fixed. Then, the connecting pipe 1 and the liquid cooling plate 2 are conveyed into a brazing furnace set with certain temperature parameters. When reaching a certain temperature, the inner welding ring 31 and the outer welding ring 32 are melted, and capillary filling is performed on the welding surface of the connecting pipe 1 and the welding surface of the liquid cooling plate 2.

[0035] The above are all the preferred embodiments of the present application, and the protection scope of the present application is not limited accordingly. Therefore, all equivalent changes made according to the structure, shape, and principle of the present application should be covered within the protection scope of the present application.

Claims

1. A liquid cooling plate assembly with a pre-embedded welding ring, characterized in that: It comprises a connecting pipe (1) and a liquid cooling plate (2), wherein a welding ring (3) is provided between the connecting pipe (1) and the liquid cooling plate (2), and the melting point of the welding ring (3) is lower than the melting points of the connecting pipe (1) and the liquid cooling plate (2), so as to weld the connecting pipe (1) and the liquid cooling plate (2).

2. The liquid cooling plate assembly with embedded welding ring according to claim 1, characterized in that: A positioning structure (4) is provided on the side wall of the connecting pipe (1) for contacting the liquid cooling plate (2), and a liquid inlet and outlet channel (11) for liquid inlet or outlet is provided on the connecting pipe (1), and the positioning structure (4) is used to position the welding ring (3).

3. The liquid cooling plate assembly with embedded welding ring according to claim 2, characterized in that: The welding ring (3) comprises an inner welding ring (31), and the inner welding ring (31) circumferentially surrounds an opening surface of the liquid inlet and outlet channel (11).

4. The liquid cooling plate assembly with embedded welding ring according to claim 3, characterized in that: The positioning structure (4) comprises an inner annular groove (41), the inner annular groove (41) being arranged circumferentially around an opening surface of the liquid inlet and outlet channel (11), and the inner annular groove (41) is used for burying the inner welding ring (31) therein to make way.

5. The liquid cooling plate assembly with embedded welding ring according to claim 4, characterized in that: The inner annular groove (41) is in communication with the opening surface of the liquid inlet and outlet channel (11).

6. The liquid cooling plate assembly with embedded welding ring according to claim 2, characterized in that: The welding ring (3) comprises an outer welding ring (32), and the outer welding ring (32) circumferentially surrounds the opening surfaces of the plurality of liquid inlet and outlet channels (11).

7. The liquid cooling plate assembly with embedded welding ring according to claim 6, characterized in that: The positioning structure (4) comprises an outer annular groove (42), the outer annular groove (42) circumferentially surrounding the opening surfaces of the plurality of liquid inlet and outlet channels (11), and the outer annular groove (42) is used for the outer welding ring (32) to be buried therein to make way.

8. The liquid cooling plate assembly with embedded welding ring according to claim 7, characterized in that: The outer annular groove (42) is close to the edge of the side wall of the connecting pipe (1) and the liquid cooling plate (2).

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