Snakelike liquid cooling flat tube, liquid cooling device and battery pack

Abstract

The embodiment of the utility model provides a snakelike liquid cooling flat tube, a liquid cooling device and a battery pack, and relates to the field of batteries. The snakelike liquid cooling flat tube comprises a middle bent section, a first welding section and a second welding section, the first welding section is communicated with one end of the middle bent section, and the second welding section is communicated with the other end of the middle bent section; the middle bent section comprises a first bent section, a second bent section, third bent sections and fourth bent sections, the two third bent sections are symmetrically distributed on the two sides of the first bent section and connected with the first bent section, the two fourth bent sections are connected to the two third bent sections respectively, the second bent section is connected with the fourth bent sections, and the second bent section is connected with the third bent sections. The fourth bending section is used for being connected with a battery cell, the first bending section and the third bending section are used for forming a glue injection cavity outside the battery cell, and heat-conducting glue can be easily injected into a gap between the battery cell and the flat tube through the glue injection cavity, so that the heat-conducting glue is uniformly distributed in the gap. The utility model also provides a liquid cooling device and a battery pack.

Description

TECHNICAL FIELD

[0001] The utility model relates to a battery field, specifically, a kind of serpentine liquid cooling flat tube, liquid cooling device and battery pack. BACKGROUND

[0002] Battery pack formed by power battery needs to be cooled when using, one of commonly used cooling methods is liquid cooling, and liquid cooling generally uses liquid cooling plate or liquid cooling pipe to contact with battery cell in battery pack, to complete heat exchange.

[0003] At present, the most common liquid cooling plate is S-shaped flat tube, S-shaped flat tube can have larger contact area with battery cell, which can improve heat exchange efficiency and also play a certain positioning and fixing role on battery cell. Heat-conducting glue needs to be set between S-shaped flat tube and battery cell, but due to the close contact between S-shaped flat tube and battery cell, it is very difficult to inject heat-conducting glue into the gap between S-shaped flat tube and battery cell, which further causes uneven heat-conducting glue. SUMMARY

[0004] The utility model provides a kind of serpentine liquid cooling flat tube, liquid cooling device and battery pack, which can solve the problem of difficulty in injecting heat-conducting glue into the gap between S-shaped flat tube and battery cell at present.

[0005] The embodiment of the utility model can be realized as follows:

[0006] The embodiment of the utility model provides a kind of serpentine liquid cooling flat tube, which comprises:

[0007] The middle curved section comprises a first bending section, a second bending section, a third bending section and a fourth bending section, two third bending sections are symmetrically distributed on both sides of the first bending section and connected with the first bending section, two fourth bending sections are respectively connected to the two third bending sections, the second bending section is connected with the fourth bending section, the fourth bending section is used to contact with battery cell, and the first bending section and the third bending section are used to form glue injection cavity outside battery cell.

[0008] The first welding section is communicated with one end of the middle curved section, and the second welding section is communicated with the other end of the middle curved section.

[0009] Optionally, the number of middle curved sections is multiple, the structures of multiple middle curved sections are the same, and multiple middle curved sections are connected in sequence.

[0010] Optionally, the number of third bending sections and fourth bending sections is at least two.

[0011] Optionally, the first bending section, the second bending section, the third bending section and the fourth bending section are all arc structures.

[0012] The embodiment of the utility model discloses a liquid cooling device, it includes:

[0013] The first hollow plate and the second hollow plate are oppositely and spacedly arranged.

[0014] The serpentine liquid cooling flat pipe is communicated with the first hollow plate through the first welding section and communicated with the second hollow plate through the second welding section.

[0015] The liquid inlet pipe is communicated with the first hollow plate, and the liquid outlet pipe is communicated with the second hollow plate.

[0016] Optionally, the number of the serpentine liquid cooling flat pipes is multiple, and the multiple serpentine liquid cooling flat pipes are arranged at equal intervals between the first hollow plate and the second hollow plate.

[0017] Optionally, a plurality of independent cooling flow channels are arranged in the serpentine liquid cooling flat pipe.

[0018] Optionally, a sealing ring is sleeved on the liquid inlet pipe and the liquid outlet pipe.

[0019] Optionally, the liquid inlet pipe comprises a liquid inlet end, and the liquid outlet pipe comprises a liquid outlet end, and the liquid inlet end of the liquid inlet pipe and the liquid outlet end of the liquid outlet pipe are located on the same side.

[0020] The embodiment of the utility model discloses a battery pack, which comprises:

[0021] A plurality of battery cells;

[0022] A tray is provided with a limiting cavity, and the plurality of battery cells are installed in the limiting cavity.

[0023] The liquid cooling device is arranged between the plurality of battery cells.

[0024] The serpentine liquid cooling flat pipe, the liquid cooling device and the battery pack have the following beneficial effects, for example:

[0025] The serpentine liquid cooling flat pipe comprises a first welding section, a second welding section and a middle bending section, the first welding section is communicated with one end of the middle bending section, and the second welding section is communicated with the other end of the middle bending section; the middle bending section comprises a first bending section, a second bending section, a third bending section and a fourth bending section, the two third bending sections are symmetrically distributed on the two sides of the first bending section and connected with the first bending section, the two fourth bending sections are respectively connected with the two third bending sections, the second bending section is connected with the fourth bending section, the fourth bending section is used for connecting with the battery cell, the first bending section and the third bending section are used for forming a glue injection cavity outside the battery cell, and the heat-conducting glue can be easily injected into the gap between the battery cell and the flat pipe through the glue injection cavity, so that the heat-conducting glue is uniformly distributed in the gap.

[0026] The liquid cooling device comprises a serpentine liquid cooling flat tube, which has all the functions of the serpentine liquid cooling flat tube.

[0027] The battery pack comprises a liquid cooling device, which has all the functions of the liquid cooling device. BRIEF DESCRIPTION OF DRAWINGS

[0028] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can also be obtained without creative labor on the basis of these drawings.

[0029] Figure 1 The structure diagram of the battery pack provided in the embodiments of the present application is shown.

[0030] Figure 2 The structure diagram of the serpentine liquid cooling flat tube and the liquid cooling device provided in the embodiments of the present application is shown.

[0031] Figure 3 The structure diagram of the tray provided in the embodiments of the present application is shown. Figure 1 The local enlarged diagram of A in the middle part is shown.

[0032] Figure 4 The structure diagram of the tray provided in the embodiments of the present application is shown.

[0033] Figure legend: 1-serpentine liquid cooling flat tube; 10-middle curved section; 101-first bending section; 102-second bending section; 103-third bending section; 104-fourth bending section; 11-first welding section; 12-second welding section; 13-glue injection cavity; 2-first hollow plate; 3-second hollow plate; 4-liquid inlet pipe; 5-liquid outlet pipe; 6-tray; 60-limiting cavity; 7-electric core. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical solutions and advantages of the embodiments of the present application more clear, the following will combine the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are some embodiments of the present application, not all the embodiments. The components of the embodiments of the present application described and shown in the drawings can be arranged and designed in various different configurations.

[0035] Therefore, the following detailed description of the embodiments of the application provided in the drawings is not intended to limit the scope of the application claimed, but merely represents selected embodiments of the application. Based on the embodiments in the application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of protection of the application.

[0036] It should be noted that: similar reference numbers and letters represent similar items in the following drawings, therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0037] In the description of the application, it should be noted that if the terms "upper", "lower", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship of the product of the application when it is usually placed, which is only for the convenience of describing the application and simplifying the description, and does not indicate or imply that the device or element must have a particular orientation, be constructed and operated in a particular orientation, therefore, it cannot be understood as a limitation on the application.

[0038] In addition, if the terms "first", "second" and the like appear, they are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0039] The term "comprise", "include" or any other variant thereof is intended to cover non-exclusive inclusion, so that the process, method, article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or device. Without more limitation, the element defined by the statement "comprising a" does not exclude the presence of additional identical elements in the process, method, article or device comprising the element.

[0040] Unless otherwise expressly specified and limited, the terms "provide", "connect" and the like should be broadly understood, for example, "connect" can be fixed connection, can also be detachable connection, or integral connection; can be mechanical connection, can also be electrical connection; can be direct connection, can also be indirect connection through intermediate medium, can be the communication inside two elements. For those of ordinary skill in the art, the specific meaning of the above terms in the application can be understood according to the specific circumstances.

[0041] It should be noted that the features in the embodiments of the application can be combined with each other without conflict.

[0042] One of the commonly used cooling methods for battery packs formed by power batteries is liquid cooling. The liquid cooling generally adopts a liquid cooling plate or a liquid cooling pipe to contact the battery cells in the battery pack to complete heat exchange. At present, the most common liquid cooling plate is an S-shaped flat pipe. The heat-conducting glue needs to be arranged between the S-shaped flat pipe and the battery cell. The S-shaped flat pipe can be better attached to the battery cell to improve the heat exchange efficiency. However, due to the close contact between the S-shaped flat pipe and the battery cell, it is very difficult to inject the heat-conducting glue into the gap between the S-shaped flat pipe and the battery cell, which further causes the heat-conducting glue to be unevenly distributed in the gap and the heat-conducting effect to be poor. Moreover, when the S-shaped flat pipe is stretched or extruded, the S-shaped flat pipe will be deformed, which causes the heat-conducting glue between the S-shaped flat pipe and the battery cell to fall off.

[0043] The embodiment of the utility model provides a kind of liquid cooling flat pipe and liquid cooling device, the liquid cooling device includes liquid cooling flat pipe, the liquid cooling flat pipe and liquid cooling device can solve above-mentioned problem, next will be described in detail to liquid cooling device and liquid cooling flat pipe.

[0044] Please refer to Figure 1 With Figure 2 The liquid cooling device includes a first hollow plate 2, a second hollow plate 3, an inlet pipe 4, an outlet pipe 5, and a liquid cooling flat pipe 1. The first hollow plate 2 and the second hollow plate 3 are arranged opposite and spaced apart. The inlet pipe 4 is in communication with the first hollow plate 2, and the outlet pipe 5 is in communication with the second hollow plate 3. The liquid cooling flat pipe 1 is arranged between the first hollow plate 2 and the second hollow plate 3, and the liquid cooling flat pipe 1 is in communication with the first hollow plate 2 and the second hollow plate 3 at the same time.

[0045] Specifically, the first hollow plate 2 and the second hollow plate 3 are both rectangular plates with hollow interiors. The top, bottom, front, back, and two end sides of the first hollow plate 2 and the second hollow plate 3 are all sealed. A first groove cavity connected with the liquid cooling flat pipe 1 is formed on the front side of the first hollow plate 2. The first groove cavity is in communication with the interior of the first hollow plate 2, and the first groove cavity is used to assemble the liquid cooling flat pipe 1. A first connecting hole is formed on the back side of the first hollow plate 2. The first connecting hole is also in communication with the interior of the first hollow plate 2, and the first connecting hole is used to install the inlet pipe 4. A second groove cavity connected with the liquid cooling flat pipe 1 is arranged on the front side of the second hollow plate 3. The second groove cavity is in communication with the interior of the second hollow plate 3, and the other end of the liquid cooling flat pipe 1 is assembled in the second groove cavity. A second connecting hole is formed on the back side of the second hollow plate 3. The second connecting hole is also in communication with the interior of the second hollow plate 3, and the second connecting hole is used to install the outlet pipe 5.

[0046] In the embodiment, the top, bottom, front, back, and two end sides of the first hollow plate 2 and the second hollow plate 3 are sealed to prevent the heat-conducting glue from leaking out of the liquid cooling flat pipe 1. Figure 1When used as a reference standard, the front side refers to the side facing the battery cell 7, the back side refers to the other side opposite to the front side, the top side refers to the side away from the tray 6, and the bottom side refers to the side close to the tray 6.

[0047] Further, a plurality of serpentine liquid cooling flat tubes 1 can be arranged between the first hollow plate 2 and the second hollow plate 3, and the plurality of serpentine liquid cooling flat tubes 1 are arranged at equal intervals between the first hollow plate 2 and the second hollow plate 3.

[0048] The serpentine liquid cooling flat tube 1 will be described in detail below.

[0049] Reference Figure 3 The serpentine liquid cooling flat tube 1 includes a middle curved section 10, a first welding section 11 and a second welding section 12 arranged at both ends of the middle curved section 10, the middle curved section 10 is connected and communicated with the first welding section 11 and the second welding section 12, the interiors of the middle curved section 10, the first welding section 11 and the second welding section 12 are hollow for circulating cooling liquid, and the first welding section 11, the second welding section 12 and the middle curved section 10 together constitute the serpentine liquid cooling flat tube 1.

[0050] Specifically, the middle curved section 10 includes a first bending section 101, a second bending section 102, a third bending section 103 and a fourth bending section 104, two third bending sections 103 are symmetrically distributed on both sides of the first bending section 101 and connected with the first bending section 101, two fourth bending sections 104 are respectively connected with the two third bending sections 103, the second bending section 102 is connected with the fourth bending section 104, the fourth bending section 104 is used for connecting with the battery cell 7, the first bending section 101 and the third bending section 103 are used for forming a glue injection cavity 13 outside the battery cell 7, and the heat-conducting glue can be easily injected into the gap between the battery cell 7 and the middle curved section 10 through the glue injection cavity 13, so that the heat-conducting glue is fully and relatively uniformly distributed in the gap, and the heat-conducting effect is good, and compared with the current method of pre-coating glue on the S-shaped flat tube and then installing the battery cell 7, the serpentine liquid cooling flat tube 1 of the utility model can be pre-installed with the battery cell 7 and then injected with glue, which simplifies the difficulty of assembly.

[0051] In the embodiment, the first bending section 101, the second bending section 102, the third bending section 103 and the fourth bending section 104 are all in the shape of circular arc.

[0052] In the embodiment, the number of the third bending section 103 and the fourth bending section 104 is at least two.

[0053] Further, the number of the middle curved section 10 is multiple, the structures of the multiple middle curved sections 10 are the same, and the multiple middle curved sections 10 are connected in sequence to connect with the multiple battery cells 7 and cool the multiple battery cells 7.

[0054] In the embodiment, the middle curved section 10 is integrally formed with the first and second welding sections 11 and 12, and in other embodiments, the middle curved section 10 can be welded or adhesively connected with the first and second welding sections 11 and 12.

[0055] The first welding section 11 is welded and connected with the first hollow plate 2 and communicates therewith, and the second welding section 12 is welded and connected with the second hollow plate 3 and communicates therewith.

[0056] In addition, the inside of the serpentine liquid cooling flat pipe 1 in the embodiment is provided with a plurality of independent cooling flow channels, the plurality of independent cooling flow channels are parallel to each other, heat dissipation of different parts in the height direction of the battery cell 7 is realized, and the heat dissipation efficiency is increased.

[0057] Further referring to Figure 1 In combination Figure 4 The embodiment of the utility model further provides a battery pack, include: a plurality of battery cell 7, tray 6 and above-mentioned liquid cooling device, tray 6 is provided with a plurality of limiting cavity 60, the shape and size of limiting cavity 60 are matched with battery cell 7, a plurality of battery cell 7 are installed in limiting cavity 60. The serpentine liquid cooling flat pipe 1 of liquid cooling device is distributed between a plurality of battery cell 7, the serpentine liquid cooling flat pipe 1 is connected with the outside wall of a plurality of battery cell 7, and cooling liquid flows in the inside of the serpentine liquid cooling flat pipe 1, so that heat exchange with the battery cell 7 of heating is completed, and the heat dissipation cooling of battery cell 7 is realized.

[0058] Since a plurality of rows and columns of battery cells 7 are generally arranged in the battery pack, according to the heat dissipation needs of the battery cells 7, the number of the serpentine liquid cooling flat pipes 1 is multiple, and one row of battery cells 7 is arranged between every two serpentine liquid cooling flat pipes 1, so that each battery cell 7 can be heat dissipated and cooled.

[0059] The liquid inlet pipe 4 includes a liquid inlet end, and the liquid outlet pipe 5 includes a liquid outlet end. In order to make the structure of the battery pack more compact, the liquid inlet end of the liquid inlet pipe 4 and the liquid outlet end of the liquid outlet pipe 5 are located on the same side, which is beneficial to uniformly arranging the liquid inlet pipe 4 and the liquid outlet pipe 5.

[0060] The liquid inlet pipe 4 is provided with a liquid inlet connector, and the liquid outlet pipe 5 is provided with a liquid outlet connector. The liquid inlet pipe 4 is connected with an external cooling liquid input device through the liquid inlet connector, and the liquid outlet pipe 5 is connected with an external cooling liquid recovery device through the liquid outlet connector, so that the circulation of the cooling liquid is realized.

[0061] Further, the liquid inlet pipe 4 and the liquid outlet pipe 5 are each provided with a sealing ring. The sealing ring on the liquid inlet pipe 4 is located at the liquid inlet connector, so as to be sealingly connected with the external cooling liquid input device. The sealing ring on the liquid outlet pipe 5 is located at the liquid outlet connector, so as to be sealingly connected with the external cooling liquid recovery device.

[0062] The battery pack comprises a serpentine liquid cooling flat tube 1 and a liquid cooling device, which has all functions of the serpentine liquid cooling flat tube 1 and the liquid cooling device.

[0063] The above merely provides a specific implementation of the present application, but the protection scope of the present application is not limited thereto, any person skilled in the art can easily think of changes or replacements within the technical range disclosed by the present application, which shall be covered within the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A serpentine liquid-cooled flat tube, characterized by, Comprising: A middle curved section (10) comprising a first bending section (101), a second bending section (102), a third bending section (103) and a fourth bending section (104), two third bending sections (103) are symmetrically distributed on both sides of the first bending section (101) and connected with the first bending section (101), two fourth bending sections (104) are connected with two third bending sections (103) respectively, the second bending section (102) is connected with the fourth bending section (104), the fourth bending section (104) is used for connecting with the battery cell (7), the first bending section (101) and the third bending section (103) are used for forming a glue injection cavity (13) outside the battery cell (7); A first welding section (11) and a second welding section (12), the first welding section (11) is communicated with one end of the middle curved section (10), and the second welding section (12) is communicated with the other end of the middle curved section (10).

2. The serpentine liquid-cooled flat tube of claim 1, wherein, The number of the middle curved sections (10) is multiple, the structures of the multiple middle curved sections (10) are the same, and the multiple middle curved sections (10) are connected in sequence.

3. The serpentine liquid-cooled flat tube of claim 1, wherein, The number of the third bending sections (103) and the fourth bending sections (104) is at least two.

4. The serpentine liquid-cooled flat tube of any one of claims 1 to 3, wherein, The first bending section (101), the second bending section (102), the third bending section (103) and the fourth bending section (104) are all arc structures.

5. A liquid cooling device, characterized by, Comprising: A first hollow plate (2) and a second hollow plate (3), the first hollow plate (2) and the second hollow plate (3) are arranged oppositely and spaced apart; The snake-shaped liquid cooling flat tube of any one of claims 1 to 4, the first welding section (11) is communicated with the first hollow plate (2), and the second welding section (12) is communicated with the second hollow plate (3); A liquid inlet pipe (4) and a liquid outlet pipe (5), the liquid inlet pipe (4) is communicated with the first hollow plate (2), and the liquid outlet pipe (5) is communicated with the second hollow plate (3).

6. The liquid cooling device of claim 5, wherein, The number of the snake-shaped liquid cooling flat tubes is multiple, and the multiple snake-shaped liquid cooling flat tubes are arranged at equal intervals between the first hollow plate (2) and the second hollow plate (3).

7. The liquid cooling device of claim 5, wherein, The inside of the snake-shaped liquid cooling flat tube is provided with multiple independent cooling flow channels.

8. The liquid cooling device of claim 5, wherein, Sealing rings are sleeved on the liquid inlet pipe (4) and the liquid outlet pipe (5).

9. The liquid cooling device of claim 5, wherein, The liquid inlet pipe (4) comprises a liquid inlet end, the liquid outlet pipe (5) comprises a liquid outlet end, and the liquid inlet end of the liquid inlet pipe (4) and the liquid outlet end of the liquid outlet pipe (5) are located on the same side.

10. A battery pack, characterized by, Comprising: Multiple battery cells (7); A tray (6) provided with a limiting cavity (60), and multiple battery cells (7) are installed in the limiting cavity (60); The liquid cooling device of any one of claims 5 to 9, and the snake-shaped liquid cooling flat tube of the liquid cooling device is arranged between the multiple battery cells (7).

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