Immersed cooling structure and battery pack

Abstract

The utility model provides an immersed cooling structure and a battery pack. The immersed cooling structure comprises a shell and a liquid inlet pipe, liquid outlets are formed in two opposite sides of the shell; the liquid inlet pipe is arranged on the shell in a penetrating mode in the direction perpendicular to the connecting line of the two liquid outlets. Liquid inlets are formed in the two ends of the liquid inlet pipe, and a plurality of liquid distribution openings are formed in the liquid inlet pipe and distributed at equal intervals in the axis direction of the liquid inlet pipe. The utility model also relates to the immersed cooling structure, which has higher heat exchange efficiency and heat dissipation effect, and can comprehensively and uniformly dissipate heat and cool the battery cell, thereby prolonging the service life of the battery cell.

Description

Technical Field

[0001] The utility model relates to the technical field of energy storage devices, in particular to an immersion cooling structure. The utility model also relates to a battery pack including the above immersion cooling structure. Background Art

[0002] A battery pack is an energy storage device that utilizes the principle of mutual conversion between chemical energy and electrical energy to achieve energy storage and energy release, and is widely used in fields such as electric vehicles, hybrid vehicles, and energy storage distribution cabinets. A large amount of heat is generated during the charging and discharging process of the battery pack. With the improvement of the energy density and integration level of the battery pack, the heat release phenomenon of the battery pack will be exacerbated. How to improve the heat dissipation efficiency of the battery pack cooling structure and maintain the ambient temperature of the components inside the battery pack within a suitable range has become the main research focus in the development and breakthrough of battery pack technology.

[0003] Currently, the battery pack thermal management solutions include air cooling solutions, direct cooling solutions, and liquid cooling solutions. Among them, the battery pack with the air cooling solution has a low heat exchange efficiency and has a greater impact on the service life of the battery cells and the number of charge and discharge cycles; the direct cooling solution has a higher heat exchange efficiency compared to the air cooling solution, but has a complex structure and a high manufacturing cost; in the liquid cooling solution, the solution using a liquid cooling plate for cooling has a relatively high application proportion, but the cooling surface of the liquid cooling plate is single and cannot ensure the comprehensive cooling effect of the battery cells.

[0004] In the prior art, there are relevant literatures reporting battery packs with an immersion liquid cooling solution, which achieve comprehensive cooling of the battery cells by immersing the battery cells in a cooling medium. However, the cooling effect of the immersion liquid cooling battery pack is not uniform, and the temperature of the battery cells on the side farther away from the liquid inlet end of the battery pack is higher than that of the battery cells on the side closer to the liquid inlet end. This phenomenon will have an adverse impact on the service life of the battery cells on the side farther away from the liquid inlet end in the battery pack. Summary of the Utility Model

[0005] In view of this, the utility model aims to propose an immersion cooling structure with high heat exchange efficiency and heat dissipation effect, which can achieve comprehensive and uniform heat dissipation and temperature reduction of the battery cells, thereby extending the service life of the battery cells.

[0006] To achieve the above object, the technical solution of the utility model is realized as follows:

[0007] An immersion cooling structure of the utility model includes a housing, and liquid outlet ports are arranged on two opposite sides of the housing;

[0008] An inlet pipe is arranged through the housing along a direction perpendicular to the line connecting the two liquid outlet ports;

[0009] Both ends of the liquid inlet pipe are provided with liquid inlets, and the liquid inlet pipe is provided with liquid distribution openings, and the liquid distribution openings are configured as a plurality of equidistantly spaced along the axis direction of the liquid inlet pipe.

[0010] Further, the liquid inlet pipe is provided as a flat pipe with an elliptical cross-section.

[0011] Further, a liquid inlet joint is provided at the liquid inlet, and the liquid inlet joint is sleeved on the liquid inlet pipe to form a sealed connection.

[0012] Further, the outer shell includes a bottom plate, and a plurality of mounting holes are provided along its own thickness direction at the edge;

[0013] A housing, covering the bottom plate, and the liquid outlet is provided on two opposite side surfaces of the housing.

[0014] Further, a plurality of baffles are provided on the bottom plate, and the baffles are symmetrically distributed on both sides of the liquid inlet to form a barrier between the liquid inlet and the liquid outlet.

[0015] Further, the longitudinal section of the baffle is trapezoidal, and the width of the baffle near the bottom plate is greater than the width of the end far from the bottom plate.

[0016] Compared with the prior art, the present utility model has the following advantages:

[0017] In the immersion cooling structure and battery pack of the present utility model, during the process that the cooling medium flows along the liquid inlet pipe and flows out from the liquid outlet to the outside of the outer shell, it can make full contact with the battery cells in the outer shell, and transfer the heat generated during the charging and discharging process of the battery cells to the outside of the outer shell through heat exchange. The above immersion cooling structure has multiple liquid inlets and liquid outlets, which can immerse and wash the battery cells by the cooling medium from different directions, and can effectively improve the full degree of contact between the cooling medium and the battery cells in all directions. Compared with the structure in the prior art that only sets a group of liquid inlets and liquid outlets and integrates the liquid inlets and liquid outlets on the same side of the battery pack, it is beneficial to reduce the temperature difference between the relatively proximal end and the relatively distal end of the battery cell module from the liquid inlet, thereby achieving the invention purposes of improving the heat dissipation efficiency and heat dissipation effect of the battery pack, realizing comprehensive and uniform heat dissipation and temperature reduction of the battery cells, and prolonging the service life of the battery cells.

[0018] In addition, by setting the liquid inlet pipe as a flat pipe with an elliptical cross-section, on the one hand, it can increase the surface area of the liquid inlet pipe, making the selection range of the opening size of the liquid distribution opening larger, and on the other hand, it can reduce the space occupation of the liquid inlet pipe in the horizontal direction inside the outer shell, thereby being beneficial to improving the overall internal space utilization rate and energy density of the battery pack, and enabling the battery pack to have better endurance performance.

[0019] By providing liquid inlet connectors at both ends of the liquid inlet pipe, quick plug-in connection with an external cooling medium circulation system can be achieved. By providing a sealing structure between the liquid inlet connector and the liquid inlet pipe, while ensuring the sealing of the connection between the liquid inlet connector and the liquid inlet pipe, the angle of the liquid inlet connector can be rotated and adjusted, thus achieving the purpose of improving the assembly convenience.

[0020] Secondly, by setting the outer shell as a combination of a bottom plate and a housing, with the housing covering the bottom plate, a cavity for the cooling medium to immerse the battery cells is formed; the mounting holes on the bottom plate can be used to install fastening bolts, thereby achieving the position fixation and limitation of structures such as the outer shell, liquid inlet pipe, and battery cells.

[0021] Furthermore, by providing baffle structures on both sides of the liquid inlet that can form a barrier between the liquid inlet and the liquid outlet, when the cooling medium enters the interior of the outer shell through the liquid inlet, it will be blocked by the baffle and will not directly flow towards the liquid outlet, thereby further enhancing the degree of full contact between the cooling medium and the battery cells and achieving the purpose of further improving the heat dissipation efficiency.

[0022] By setting the baffle as a plate body with a trapezoidal longitudinal cross-section, the contact area between the baffle and the bottom plate can be increased, thereby enhancing the rigidity and load-bearing capacity of the connection structure between the baffle and the bottom plate, making the baffle not easily deformed during the process of withstanding the scouring of the cooling medium.

[0023] In addition, the present utility model also proposes a battery pack provided with the above-mentioned immersion cooling structure:

[0024] It includes an immersion cooling structure, and the immersion cooling structure is the immersion cooling structure described above;

[0025] A battery cell module, fixedly arranged inside the outer shell.

[0026] Further, the battery cell modules are configured to be two symmetrically distributed on both sides of the liquid inlet pipe.

[0027] Further, the battery cell module includes support plates, configured to be two parallel to each other in the vertical direction;

[0028] Cylindrical battery cells, configured to be multiple vertically clamped between the two support plates, and there is a gap between the cylindrical battery cells and the support plates.

[0029] Further, the spacing of the liquid distribution ports is 1.8 - 2.2 times the diameter of the cylindrical battery cells, and the opening length of the liquid distribution ports is 0.2 - 0.3 times the diameter of the cylindrical battery cells.

[0030] The battery pack of the present utility model has the same beneficial effects as the above-mentioned immersion cooling structure compared to the prior art, and will not be elaborated herein.

[0031] In addition, by setting the number of battery cell modules to two groups symmetrically distributed with respect to the liquid inlet pipe, a larger number of modules can be integrated in the battery pack, thus having a higher energy density. By symmetrically arranging the battery cell modules on both sides of the liquid inlet pipe, the cooling medium flowing out of the liquid inlet pipe can cool the battery cell modules on both sides respectively and flow out to the outside of the housing through the liquid outlet ports on both sides. Compared with the single-side arrangement, the heat dissipation effect of the battery cell modules is more uniform, the temperature difference is smaller, which is beneficial to improving the service life of the battery cell modules.

[0032] Secondly, by providing two support plates arranged parallel to each other in the vertical direction, it is possible to limit and support both ends of the cylindrical battery cells vertically clamped between the two support plates. The cylindrical battery cells play a role in storing and releasing electrical energy. The gap between the cylindrical battery cells and the support plates reserves space for the flow of the cooling medium. The cooling medium discharged from the liquid inlet pipe can flow through the gap between the cylindrical battery cells and the support plates to the outside of the housing, and in this process, it comes into full contact with the cylindrical battery cells and transfers the heat generated by the charging and discharging of the cylindrical battery cells to the outside through heat exchange.

[0033] Furthermore, by forming a matching relationship between the opening size and the opening spacing of the liquid distribution ports and the diameter of the cylindrical battery cells at a certain ratio, when the diameter and the arrangement density of the cylindrical battery cells change, the opening mode of the liquid distribution ports will also change adaptively, so as to ensure that the heat dissipation effect on the cylindrical battery cells will not be affected by the arrangement mode of the cylindrical battery cells. Description of the Drawings

[0034] The drawings forming a part of the present utility model are used to provide a further understanding of the present utility model. The schematic embodiments of the present utility model and their descriptions are used to explain the present utility model and do not constitute an improper limitation of the present utility model. In the drawings:

[0035] Figure 1 is a schematic structural diagram of the immersion cooling structure in the embodiment of the present utility model;

[0036] Figure 2 is a schematic structural diagram of the housing in the embodiment of the present utility model;

[0037] Figure 3 is a schematic structural diagram of the liquid inlet pipe in the embodiment of the present utility model;

[0038] Figure 4 is a schematic structural diagram of the battery cell module in the embodiment of the present utility model.

[0039] Description of the Reference Numerals:

[0040] 1. Housing;

[0041] 101. Liquid outlet; 102. Bottom plate; 103. Housing; 104. Baffle;

[0042] 2. Liquid inlet pipe;

[0043] 201. Liquid inlet; 202. Liquid distribution port; 203. Liquid inlet connector;

[0044] 3. Battery cell module;

[0045] 301. Support plate; 302. Cylindrical battery cell. Detailed implementation manners

[0046] It should be noted that, without conflict, the embodiments in the present invention and the features in the embodiments can be combined with each other. In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following will describe the specific implementation manners of the present invention with reference to the drawings. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained according to these drawings, and other implementation manners can also be obtained.

[0047] In the description of the present invention, it should be noted that if terms indicating orientation or positional relationship such as "upper", "lower", "inner", "outer", etc. appear, they are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be understood as a limitation to the present invention. In addition, if terms such as "first", "second", etc. appear, they are also only for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0048] Taking an immersion cooling structure and a battery pack described in the present invention as an example, the orientation words such as "upper, lower, left, right, front, back" used in the embodiments are defined based on the up and down direction (also known as the height direction, or the Z direction of the battery pack), the left and right direction (also known as the width direction, or the Y direction of the battery pack), and the front and back direction (also known as the length direction, or the X direction of the battery pack) of the battery pack. "Inner" and "outer" are defined based on the contour of the corresponding component. For example, "inner" and "outer" defined based on the contour of the battery pack, the side close to the middle of the battery pack is "inner", and vice versa is "outer".

[0049] In addition, in the description of the present utility model, unless otherwise clearly defined, the terms "installation", "connection", "connection", and "connector" shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood in combination with specific situations.

[0050] The following will refer to the attached Figure 1 to the attached Figure 4 and in combination with embodiments to detail the present utility model.

[0051] Embodiment 1

[0052] This embodiment relates to an immersion cooling structure having a plurality of liquid inlets and a plurality of liquid outlets; on the one hand, a liquid inlet pipe having two liquid inlets and a plurality of liquid distribution ports is penetrated and provided on the outer shell, and on the other hand, two liquid outlets are provided on two opposite sides of the outer shell. The above structure enables the coolant to uniformly enter the interior of the outer shell from different sides, and after heat exchange with the battery cell module in the outer shell, transfer the heat generated by the battery cell module to the outside of the outer shell. Compared with the structure in the prior art that only sets a group of liquid inlets and liquid outlets and integrates the liquid inlets and liquid outlets on the same side of the battery pack, the immersion cooling structure in the present utility model can make the cooling medium have more uniform and sufficient contact with the battery cell module, which is beneficial to reducing the temperature difference between the relatively proximal end and the relatively distal end where the battery cell module is far from the liquid inlet, thereby achieving the invention purposes of improving the heat dissipation efficiency and heat dissipation effect of the battery pack, realizing comprehensive and uniform heat dissipation and temperature reduction of the battery cells, and extending the service life of the battery cells.

[0053] In terms of the overall structure, referring to Figure 1 , Figure 2 and Figure 3, the immersion cooling structure of this embodiment includes a housing 1 and a liquid inlet pipe 2. Among them, the housing 1 can be a hollow metal sheet structure made of aluminum alloy. Two opposite sides of the housing 1 are provided with liquid outlet openings 101. The liquid outlet openings 101 communicate the interior of the housing 1 with the outside world, and can allow the cooling medium to flow out from the inside of the housing 1. The two liquid outlet openings 101 on the housing 1 are respectively arranged at different heights. The liquid inlet pipe 2 can be a hollow metal pipe made of aluminum alloy. The liquid inlet pipe 2 is vertically penetrated through the housing 1 along the direction perpendicular to the connection line of the two liquid outlet openings 101. Each end of the liquid inlet pipe 2 is provided with a liquid inlet opening 201. A plurality of liquid distribution openings 202 are formed on the liquid inlet pipe 2. The plurality of liquid distribution openings 202 are spaced at equal intervals along the axial direction of the liquid inlet pipe 2. The cooling medium enters the interior of the liquid inlet pipe 2 through the liquid inlet openings 201 at both ends of the liquid inlet pipe 2, and then enters the interior of the housing 1 after being split by the plurality of liquid distribution openings 202, and finally flows out to the outside of the housing 1 respectively from the two liquid outlet openings 101 on the housing 1.

[0054] With the above settings, during the process that the cooling medium flows along the liquid inlet pipe 2 and flows out from the liquid outlet opening 101 to the outside of the housing 1, it can make full contact with the battery cells in the housing 1, and transfer the heat generated during the charging and discharging process of the battery cells to the outside of the housing 1 through heat exchange. The above immersion cooling structure has a plurality of liquid inlet openings 201 and liquid outlet openings 101, and can soak and wash the battery cells from different directions, which can effectively improve the degree of full contact between the cooling medium and the battery cells in all directions. Compared with the structure in the prior art that only sets a group of liquid inlet openings 201 and liquid outlet openings 101 and integrates the liquid inlet openings 201 and the liquid outlet openings 101 on the same side of the battery pack, it is beneficial to reduce the temperature difference between the relatively proximal end and the relatively distal end where the battery cell module 3 is far from the liquid inlet opening 201, thus achieving the invention purpose of improving the heat dissipation efficiency and heat dissipation effect of the battery pack, realizing comprehensive and uniform heat dissipation and temperature reduction of the battery cells, and prolonging the service life of the battery cells.

[0055] Based on the above design concept, specifically, in this embodiment, referring to Figure 2 , in order to reduce the volume occupied by the liquid inlet pipe 2 in the housing 1, the liquid inlet pipe 2 is set as a flat pipe with an elliptical cross-section. The long axis of the cross-section of the liquid inlet pipe 2 is arranged vertically.

[0056] By setting the liquid inlet pipe 2 as a flat pipe with an elliptical cross-section, on the one hand, it can increase the surface area of the liquid inlet pipe 2, making the selection range of the opening size of the liquid distribution openings 202 larger, and on the other hand, it can reduce the space occupied by the liquid inlet pipe 2 in the horizontal direction in the housing 1, thus being beneficial to improving the overall internal space utilization rate and energy density of the battery pack, and enabling the battery pack to have better endurance performance.

[0057] Referring to Figure 1 and Figure 3, for the purpose of improving the assembly convenience, in this embodiment, a liquid inlet joint 203 is installed at the liquid inlet 201 of the liquid inlet pipe 2. The liquid inlet joint 203 is sleeved on the end of the liquid inlet pipe 2 and is connected to the liquid inlet pipe 2 in a clamping manner. An O-shaped rubber sealing ring is arranged between the liquid inlet joint 203 and the liquid inlet pipe 2, realizing the rotary seal between the liquid inlet joint 203 and the liquid inlet pipe 2.

[0058] By providing the liquid inlet joints 203 at both ends of the liquid inlet pipe 2, it is possible to achieve quick plug-in connection with the external cooling medium circulation system. By providing a sealing structure between the liquid inlet joint 203 and the liquid inlet pipe 2, while ensuring the sealing performance of the connection part between the liquid inlet joint 203 and the liquid inlet pipe 2, the angle of the liquid inlet joint 203 can be rotated and adjusted, thus achieving the purpose of improving the assembly convenience.

[0059] Refer to Figure 1 and Figure 2 , in order to support and fix the liquid inlet pipe 2 and the battery cell, in this embodiment, the housing 1 includes a bottom plate 102 and a housing body 103. Among them, the bottom plate 102 can be a thin metal plate made of aluminum alloy. A plurality of mounting holes are provided at the edge of the bottom plate 102. The mounting holes can be circular through holes opened along the thickness direction of the bottom plate 102. The housing body 103 can be a sheet metal structural part made of aluminum alloy. The housing body 103 is buckled on the bottom plate 102 by welding and bolt connection, forming a cavity structure. The liquid inlet pipe 2 is passed through the housing body 103, and liquid outlet ports 101 are provided on two opposite sides of the housing body 103.

[0060] By setting the housing 1 as a combination of the bottom plate 102 and the housing body 103, with the housing body 103 buckled on the bottom plate 102, a cavity for the cooling medium to immerse the battery cell is formed; the mounting holes on the bottom plate 102 can be used to install fastening bolts, thus realizing the position fixing and limiting of the housing 1, the liquid inlet pipe 2, the battery cell and other structures.

[0061] Refer to Figure 1 and Figure 2 , for the purpose of further improving the heat dissipation efficiency, in this embodiment, a plurality of baffles 104 are vertically and fixedly arranged on the bottom plate 102. The baffles 104 are symmetrically distributed on both sides of the liquid inlet 201 of the liquid inlet pipe 2. The baffles 104 form a barrier between the liquid inlet 201 and the liquid outlet ports 101.

[0062] By providing the baffle 104 structure that can form a barrier between the liquid inlet 201 and the liquid outlet ports 101 on both sides of the liquid inlet 201, when the cooling medium enters the interior of the housing 1 through the liquid inlet 201, it will be blocked by the baffle 104 and will not directly flow to the liquid outlet ports 101, thereby further improving the degree of full contact between the cooling medium and the battery cell and achieving the purpose of further improving the heat dissipation efficiency.

[0063] Reference Figure 2 Figure 2 , in order to improve the stability of the structure of the baffle 104, in this embodiment, the longitudinal cross-sectional shape of the baffle 104 is trapezoidal. The width of the side of the baffle 104 close to the bottom plate 102 is greater than the width of the side of the baffle 104 away from the bottom plate 102.

[0064] By setting the baffle 104 as a plate body with a trapezoidal longitudinal cross-section, the contact area between the baffle 104 and the bottom plate 102 can be increased, thereby improving the rigidity and load-bearing capacity of the connection structure between the baffle 104 and the bottom plate 102, and making the baffle 104 not easily deformed during the process of withstanding the scouring of the cooling medium.

[0065] Embodiment Two

[0066] This embodiment relates to a battery pack, which includes the immersion cooling structure described in Embodiment One, and further includes a battery cell module 3 installed in the immersion cooling structure. By adopting the immersion cooling structure described above, the cooling medium can scour and soak the battery cell module 3 of the battery pack from multiple directions, realizing uniform and sufficient cooling of the battery cell module 3.

[0067] In order to further improve the energy density and endurance performance of the battery pack, in this embodiment, the battery cell module 3 is set to two groups. The two groups of battery cell modules 3 are symmetrically arranged with respect to the liquid inlet pipe 2.

[0068] By setting the number of the battery cell modules 3 to two groups symmetrically distributed with respect to the liquid inlet pipe 2, a larger number of modules can be integrated in the battery pack, thereby having a higher energy density. By symmetrically arranging the battery cell modules 3 on both sides of the liquid inlet pipe 2, the cooling medium flowing out of the liquid inlet pipe 2 can cool the battery cell modules 3 on both sides respectively and flow out to the outside of the housing 1 from the liquid outlet ports 101 on both sides. Compared with the single-sided setting, the heat dissipation effect of the battery cell module 3 is more uniform, the temperature difference is smaller, which is beneficial to improving the service life of the battery cell module 3.

[0069] In this embodiment, with reference to Figure 4 Figure 4 , the battery cell module 3 includes a support plate 301 and cylindrical battery cells 302. Among them, the two support plates 301 are arranged parallel to each other along the vertical direction. The cylindrical battery cells 302 are vertically clamped between the two support plates 301. There is a gap between the cylindrical battery cells 302 and the support plate 301.

[0070] By providing two support plates 301 that are parallel to each other in the vertical direction, it is possible to limit and support both ends of the cylindrical battery cell 302 that is vertically clamped between the two support plates 301. The cylindrical battery cell 302 functions to store and release electrical energy. The gap between the cylindrical battery cell 302 and the support plate 301 reserves space for the flow of the cooling medium. The cooling medium discharged from the liquid inlet pipe 2 can flow to the outside of the housing 1 through the gap between the cylindrical battery cell 302 and the support plate 301, and during this process, it comes into full contact with the cylindrical battery cell 302 and transfers the heat generated during the charging and discharging of the cylindrical battery cell 302 to the outside through heat exchange.

[0071] In this embodiment, referring to Figure 3 , the liquid distribution port 202 formed in the liquid inlet pipe 2 is a long strip-shaped rectangular hole. The length direction of the liquid distribution port 202 is perpendicular to the axis direction of the liquid inlet pipe 2. The distance between two adjacent liquid distribution ports 202 is 1.8 to 2.2 times the diameter of the cylindrical battery cell 302. The opening length of the liquid distribution port 202 is 0.2 to 0.3 times the diameter of the cylindrical battery cell 302.

[0072] By forming a matching relationship between the size and spacing of the liquid distribution port 202 and the diameter of the cylindrical battery cell 302 at a certain ratio, when the diameter and arrangement density of the cylindrical battery cell 302 change, the opening method of the liquid distribution port 202 will also change adaptively, thereby ensuring that the heat dissipation effect on the cylindrical battery cell 302 is not affected by the arrangement method of the cylindrical battery cell 302.

[0073] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the spirit and scope of the technical solutions of the present invention, and they should all be covered within the scope of the claims of the present invention.

Claims

1. An immersion cooling structure, characterized in that: It comprises a shell, and two opposite sides of the shell are provided with liquid outlets; A liquid inlet pipe is provided on the housing along a direction perpendicular to a line connecting the two liquid outlets; Liquid inlets are arranged at both ends of the liquid inlet pipe, and a liquid separation port is opened on the liquid inlet pipe. The liquid separation port is constructed to be a plurality of ports that are evenly spaced and distributed along the axis direction of the liquid inlet pipe.

2. The immersion cooling structure according to claim 1, characterized in that: The liquid inlet pipe is configured as a flat tube with an elliptical cross section.

3. The immersion cooling structure according to claim 1, characterized in that: A liquid inlet joint is provided at the liquid inlet, and the liquid inlet joint is sleeved on the liquid inlet pipe to form a sealed connection.

4. The immersion cooling structure according to claim 1, characterized in that: The housing comprises a bottom plate, the edge of which is provided with a plurality of mounting holes opened along the thickness direction of the bottom plate; The shell body is buckled on the bottom plate, and the liquid outlet is arranged on two opposite sides of the shell body.

5. The immersion cooling structure according to claim 4, characterized in that: A plurality of baffles are arranged on the bottom plate, and the baffles are symmetrically distributed on both sides of the liquid inlet to form a barrier between the liquid inlet and the liquid outlet.

6. The immersion cooling structure according to claim 5, characterized in that: The longitudinal cross section of the baffle is a trapezoid, and the width of the baffle at one end close to the bottom plate is greater than the width of the baffle at one end away from the bottom plate.

7. A battery pack, characterized in that: Comprising an immersion cooling structure, wherein the immersion cooling structure is the immersion cooling structure according to any one of claims 1 to 6; The battery core module is fixedly arranged in the shell.

8. The battery pack according to claim 7, characterized in that: The battery cell modules are constructed to be two symmetrically distributed on both sides of the liquid inlet pipe.

9. The battery pack according to claim 7, characterized in that: The battery cell module includes a support plate, which is structured into two supporting plates distributed parallel to each other in a vertical direction; The cylindrical battery cells are constructed to be vertically clamped between the two support plates, and there is a gap between the cylindrical battery cells and the support plates.

10. The battery pack according to claim 9, characterized in that: The spacing between the liquid separation ports is 1.8 to 2.2 times the diameter of the cylindrical battery core, and the opening length of the liquid separation ports is 0.2 to 0.3 times the diameter of the cylindrical battery core.

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