Liquid cooling system and battery box using same

Abstract

The present application relates to the technical field of batteries, and specifically discloses a liquid cooling system and a battery box using same. The liquid cooling system comprises: a plurality of liquid cooling plates which are sequentially arranged, wherein each liquid cooling plate comprises an end seat and a heat dissipation portion, and the end seat is provided with a liquid inlet interface pipe and a liquid outlet interface pipe which are communicated with the heat dissipation portion; and a plurality of connecting pipes, wherein the connecting pipes are used for connecting adjacent liquid inlet interface pipes and liquid outlet interface pipes, so that the liquid cooling plates are connected in parallel. The two end seats located at the outermost sides are respectively provided with a liquid inlet main interface and a liquid outlet main interface, the liquid inlet main interface is used for being communicated with the liquid inlet interface pipes to input a cooling liquid into the heat dissipation portions, and the liquid outlet main interface is used for being communicated with the liquid outlet interface pipes to discharge the cooling liquid in the heat dissipation portions.

Description

Liquid cooling system and battery box using the same

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on September 12, 2023, with application number 2023224767170. The entire contents of the above application are incorporated by reference into this application. Technical Field

[0002] The present application relates to the field of battery technology, and specifically discloses a liquid cooling system and a battery box using the same. Background Art

[0003] The mainstream battery cell types in related technologies include cylindrical cells, square cells and soft-pack cells. Among them, cylindrical cells have higher energy density, better safety and stability, and require lower production costs. Therefore, they are widely promoted and used in electric vehicles.

[0004] The battery box of cylindrical batteries mainly uses serpentine tube liquid cooling plates in contact with the sides of the battery cells for thermal management. The serpentine tube liquid cooling plates have a large contact area with the battery cells and high cooling efficiency. At the same time, the liquid cooling system using the serpentine tube liquid cooling plates has a small pressure drop. Technical issues

[0005] Because the structure of the serpentine tube liquid cooling plate is too compact, the connection design of the liquid cooling system is relatively difficult, making it difficult to ensure reliability. Most related technologies use nylon tube expansion connection, which has low grouping efficiency and relatively poor reliability. Technical Solutions

[0006] In a first aspect, the present application provides a liquid cooling system, comprising:

[0007] A plurality of liquid cooling plates are arranged in sequence, the liquid cooling plates comprising an end seat and a heat dissipation portion, the end seat being provided with a liquid inlet interface pipe and a liquid outlet interface pipe connected to the heat dissipation portion;

[0008] A plurality of connecting pipes, the connecting pipes are used to connect adjacent liquid inlet interface pipes and liquid outlet interface pipes to connect the liquid cooling plates in parallel;

[0009] The two end seats located at the outermost sides are respectively provided with a liquid inlet main interface and a liquid outlet main interface. The liquid inlet main interface is used to connect the liquid inlet interface pipes to input the coolant into the heat dissipation part, and the liquid outlet main interface is used to connect the liquid outlet interface pipes to discharge the coolant in the heat dissipation part.

[0010] In a second aspect, the present application provides a battery box that uses the liquid cooling system as described above. Beneficial effects

[0011] By setting up multiple connecting pipes to connect adjacent liquid inlet interface pipes and liquid outlet interface pipes, the liquid cooling plates are connected in parallel, and a liquid inlet main interface and a liquid outlet main interface are respectively provided at the two end seats located at the outermost sides to connect the liquid inlet interface pipes to input the coolant into the heat dissipation part and connect the liquid outlet interface pipes to discharge the coolant in the heat dissipation part, thereby realizing full parallel connection between the liquid cooling plates, which not only ensures the reliability of the connection between the liquid cooling plates, but also reduces the flow resistance of the liquid cooling system and improves the uniformity of the liquid cooling flow, so that the liquid cooling system has a better liquid cooling effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] FIG1 is a schematic diagram of an embodiment of a liquid cooling system of the present application;

[0013] FIG2 is a disassembled diagram of an embodiment of a liquid cooling system of the present application;

[0014] FIG3 is an enlarged view of area A in FIG2 ;

[0015] FIG4 is a schematic diagram of a connecting pipe in an embodiment of a liquid cooling system of the present application;

[0016] FIG5 is an application diagram of a liquid cooling system embodiment of the present application.

[0017] The meanings of the reference numerals are as follows:

[0018] 1. Liquid cooling plate; 11. End seat; 111. Liquid inlet interface pipe; 112. Liquid outlet interface pipe; 12. Heat dissipation unit; 13. Liquid inlet main interface; 14. Liquid outlet main interface; 2. Connecting pipe; 21. Internal thread; 3. Battery. Modes for Carrying Out the Invention

[0019] Example 1

[0020] As shown in Figures 1 to 5, the present application provides an embodiment of a liquid cooling system, including:

[0021] A plurality of liquid cooling plates 1 are arranged in sequence, and the liquid cooling plates 1 include an end seat 11 and a heat dissipation portion 12. The end seat 11 is provided with a liquid inlet interface pipe 111 and a liquid outlet interface pipe 112 connected to the heat dissipation portion 12; a plurality of connecting pipes 2, and the connecting pipes 2 are used to connect adjacent liquid inlet interface pipes 111 and liquid outlet interface pipes 112 so that each liquid cooling plate 1 is connected in parallel; the two end seats 11 located on the outermost side are respectively provided with a liquid inlet main interface 13 and a liquid outlet main interface 14, the liquid inlet main interface 13 is used to connect each liquid inlet interface pipe 111 to input the cooling liquid into the heat dissipation portion 12, and the liquid outlet main interface 14 is used to connect each liquid outlet interface pipe 112 to discharge the cooling liquid in the heat dissipation portion 12.

[0022] Through the above-mentioned setting, a full parallel connection between each liquid cooling plate 1 is achieved, which not only ensures the reliability of the connection between each liquid cooling plate 1, but also reduces the flow resistance of the liquid cooling system and improves the uniformity of the liquid cooling flow, thereby making the liquid cooling system have a better liquid cooling effect.

[0023] As shown in Figures 3 to 4, specifically, the inner wall of the connecting pipe 2 is provided with an internal thread 21, and the outer wall of the liquid inlet interface pipe 111 is provided with a first external thread. The connecting pipe 2 connects the adjacent liquid inlet interface pipes 111 through the internal thread 21 and the first external thread, thereby strengthening the connection strength between the connecting pipe 2 and the liquid inlet interface pipe 111 and improving the reliability of the connection between each liquid cooling plate 1; more specifically, the internal thread 21 is provided on the inner wall at both ends of the connecting pipe 2, and correspondingly, the first external thread is provided on the outer wall of the end of the liquid inlet interface pipe 111. Under the premise of ensuring the connection reliability, the thread processing part of the connecting pipe 2 and the liquid inlet interface pipe 111 is reduced, thereby reducing the processing cost and time.

[0024] In some embodiments, the outer wall of the liquid outlet interface tube 112 is provided with a second external thread, and the connecting tube 2 connects the adjacent liquid outlet interface tubes 112 through the internal thread 21 cooperating with the second external thread, thereby strengthening the connection strength between the connecting tube 2 and the liquid outlet interface tube 112, and improving the reliability of the connection between each liquid cooling plate 1; in other embodiments, the internal thread 21 is provided on the inner wall at both ends of the connecting tube 2, and correspondingly, the second external thread is provided on the outer wall of the end portion of the liquid outlet interface tube 112. Under the premise of ensuring the connection reliability, the thread processing part of the liquid outlet interface tube 112 is reduced, thereby reducing the processing cost and time.

[0025] In some embodiments, a semi-annular liquid cooling channel is formed in the heat dissipation portion 12, and the two ends of the liquid cooling channel are respectively connected to the liquid inlet interface pipe 111 and the liquid outlet interface pipe 112, so that the coolant can fully flow through the interior of the heat dissipation portion 12, providing a better cooling effect for the heat dissipation portion 12; in some embodiments, the liquid cooling channel is arranged along the extension direction of the heat dissipation portion 12.

[0026] Since there are tolerances in the production of batteries and the assembly of the liquid cooling system, the connecting pipe 2 is set as a hot melt pipe. The connecting pipe 2 can be deformed by hot melting to fit the liquid inlet interface pipe 111 and / or the liquid outlet interface pipe 112, so that the liquid cooling plate 1 and the batteries 3 between each liquid cooling plate 1 are completely fitted, making up for the gap caused by the tolerance, improving the compactness of the overall structure of the liquid cooling system, and achieving the effect of ensuring the connection reliability of the liquid cooling plate 1 and reducing the overall volume of the liquid cooling system; in actual assembly, the inner diameter of the connecting pipe 2 is greater than or equal to the outer diameter of the liquid inlet interface pipe 111 and the liquid outlet interface pipe 112. First, the connecting pipe 2 is The tube 2 is sleeved on the liquid inlet interface tube 111 and the liquid outlet interface tube 112 on one of the adjacent end seats 11, and then the liquid inlet interface tube 111 and the liquid outlet interface tube 112 on the other adjacent end seat 11 are aligned with the liquid inlet interface tube 111 and the liquid outlet interface tube 112 on the above-mentioned connecting tube 2. Finally, the connecting tube 2 is moved to the middle of the two liquid inlet interface tubes 111 and the middle of the two liquid outlet interface tubes 112, and the connecting tube 2 is hot-melted, so that one connecting tube 2 is hot-melted to the two liquid inlet interface tubes 111 as one, and the other connecting tube 2 is hot-melted to the two liquid outlet interface tubes 112 as one.

[0027] In some embodiments, the liquid cooling plates 1 are equidistantly distributed so that there is installation space between the liquid cooling plates 1 for placing the battery 3; wherein, when the battery 3 is a cylindrical battery, the projection of the heat dissipation portion 12 on the horizontal plane is wavy, so that the side of the heat dissipation portion 12 fits the battery 3, thereby enhancing the compactness of the internal structure of the liquid cooling system, improving the cooling effect, and reducing the overall volume of the liquid cooling system.

[0028] In some embodiments, the liquid inlet interface pipe 111 is higher than the liquid outlet interface pipe 112 in the direction of gravity, so that the coolant flows from top to bottom through the heat dissipation part 12, using gravity to reduce the flow resistance of the liquid cooling system and achieve better liquid cooling effect.

[0029] The following is an exemplary description of the workflow of the above-mentioned liquid cooling system embodiment:

[0030] The coolant flows into each liquid inlet interface pipe 111 in sequence through the liquid inlet main interface 13, and flows through the interior of the heat dissipation portion 12 along the liquid cooling channel under the action of gravity, and then flows to the liquid outlet main interface 14 through each liquid outlet interface pipe 112 for discharge, thereby completing one cooling process. In actual use, the above process is repeated many times to cool the battery 3.

[0031] Example 2

[0032] Based on the same concept, the present application also discloses a battery box, which is equipped with the liquid cooling system as described above.

[0033] It should be noted that the various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same and similar parts between the various embodiments can be referenced to each other.

Claims

1. Liquid cooling system, including: A plurality of liquid cooling plates (1) are arranged in sequence, wherein the liquid cooling plates (1) comprise an end seat (11) and a heat dissipation portion (12), and the end seat (11) is provided with a liquid inlet interface pipe (111) and a liquid outlet interface pipe (112) connected to the heat dissipation portion (12); a plurality of connecting pipes (2), the connecting pipes (2) being used to connect adjacent liquid inlet interface pipes (111) and liquid outlet interface pipes (112) so as to connect the liquid cooling plates (1) in parallel; The two end seats (11) located at the outermost sides are respectively provided with a liquid inlet main interface (13) and a liquid outlet main interface (14); the liquid inlet main interface (13) is used to connect the liquid inlet interface pipes (111) to input the cooling liquid into the heat dissipation part (12); the liquid outlet main interface (14) is used to connect the liquid outlet interface pipes (112) to discharge the cooling liquid in the heat dissipation part (12).

2. The liquid cooling system according to claim 1, wherein: The inner wall of the connecting pipe (2) is provided with an internal thread (21), and the outer wall of the liquid inlet interface pipe (111) is provided with a first external thread. The connecting pipe (2) connects adjacent liquid inlet interface pipes (111) by matching the internal thread (21) with the first external thread.

3. The liquid cooling system according to claim 2, wherein: The internal thread (21) is arranged on the inner walls at both ends of the connecting pipe (2), and / or the first external thread is arranged on the outer wall at the end of the liquid inlet interface pipe (111).

4. The liquid cooling system according to claim 2, wherein: The outer wall of the liquid outlet interface pipe (112) is provided with a second external thread, and the connecting pipe (2) connects adjacent liquid outlet interface pipes (112) via the internal thread (21) that cooperates with the second external thread.

5. The liquid cooling system according to claim 4, wherein: The internal thread (21) is arranged on the inner walls at both ends of the connecting pipe (2), and / or the second external thread is arranged on the outer wall at the end of the liquid outlet interface pipe (112).

6. The liquid cooling system according to any one of claims 1 to 5, wherein: A semi-annular liquid cooling channel is formed in the heat dissipation portion (12), and two ends of the liquid cooling channel are respectively connected to the liquid inlet interface pipe (111) and the liquid outlet interface pipe (112).

7. The liquid cooling system according to any one of claims 1 to 5, wherein: At least one of the connecting tubes (2) is configured as a hot-melt tube, and the connecting tube (2) can be deformed by hot-melting to fit the liquid inlet interface tube (111) and / or the liquid outlet interface tube (112).

8. The liquid cooling system according to any one of claims 1 to 5, wherein: The liquid cooling plates (1) are distributed at equal distances from each other, so that installation spaces for placing batteries are left between the liquid cooling plates (1).

9. The liquid cooling system according to any one of claims 1 to 5, wherein: The liquid inlet interface pipe (111) is higher than the liquid outlet interface pipe (112) in the direction of gravity, so that the cooling liquid flows from top to bottom through the heat dissipation portion (12).

10. A battery box, applied with a liquid cooling system as claimed in any one of claims 1 to 9.

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