Power battery pack and vehicle

Abstract

A power battery pack and a vehicle. The power battery pack comprises: a shell (10), a battery cell assembly (20), and a cooling tube (30). The battery cell assembly (20) is connected to the shell (10). The battery cell assembly (20) comprises an upper wall (21) and a lower wall (22) that are spaced apart from each other, as well as a side wall that is connected between the upper wall (21) and the lower wall (22). The side wall is provided with a terminal pin (23). At least part of the shell (10) is arranged around the side wall. The cooling tube (30) is connected to the shell (10) to cool the terminal pin (23).

Description

CROSS-REFERENCE TO RELATED REGISTRATIONS

[0001] This application is based on Chinese patent application No. 202321263848.4 filed on May 23, 2023, and claims priority of the aforementioned Chinese patent application, which is incorporated herein in its entirety by reference. TECHNICAL AREA

[0002] This application falls within the field of vehicle technologies and specifically concerns a power battery pack and a vehicle. BACKGROUND

[0003] A high-performance battery pack can be used in a vehicle with a new energy source to provide electrical power and is an important energy source for the vehicle. Therefore, the high-performance battery pack has a significant impact on the vehicle's performance.

[0004] In a conventional technology, a power battery pack comprises a shell, a cell assembly, and a liquid cooling plate. The cell assembly is located within the shell, and the liquid cooling plate is positioned on the top or bottom of the cell assembly to provide cooling and heat dissipation.

[0005] However, in examining the conventional technology, the inventors discovered that a connection pin is located on a side surface of the cell assembly. Due to the small surface area of ​​this side surface, the connection pin has a small conductive area and easily generates heat that cannot be dissipated quickly enough, thus impairing the charging and operating performance of the power battery pack. SUMMARY

[0006] The present application aims to solve at least part of one of the technical problems from the prior art.

[0007] Against this background, the purpose of the present application is to provide a power battery pack.

[0008] Another purpose of this application is to provide a vehicle.

[0009] According to a first aspect, one embodiment of the present application provides for a power battery pack. The power battery pack comprises: a casing, a cell assembly, and a cooling tube.

[0010] The cell assembly is connected to the shell. The cell assembly comprises an upper wall and a lower wall, which are arranged opposite each other, and a side wall connected between the upper and lower walls. A connecting pin is located on the side wall. The shell is arranged at least partially around the side wall. The cooling tube is connected to the shell to cool the connecting pin.

[0011] In the power battery pack according to this embodiment of the present application, if the terminal pin on the side wall of the cell assembly generates heat during a working process, the heat can be transferred to the shell and then dissipated via the shell to the cooling tube. Heat exchange takes place to achieve heat dissipation and a reduction in the temperature of the side wall of the cell assembly. The situation where a small side surface area of ​​the cell assembly results in the terminal pin having a small conductive area and thus easily generating heat is avoided. Due to the conductive function of the shell, the heat can be dissipated from the side wall of the cell assembly in a timely manner, so that the power battery pack exhibits improved performance during charging and use.

[0012] According to a second aspect, one embodiment of the present application provides for a vehicle. The vehicle includes the power battery pack.

[0013] In the vehicle according to this embodiment of the present application, the vehicle comprises the power battery pack. The power battery pack comprises: a shell, a cell assembly, and a cooling tube. The cell assembly is connected to the shell. The cell assembly comprises an upper wall and a lower wall, which are arranged opposite each other, and a side wall, which is connected between the upper wall and the lower wall. A terminal pin is arranged on the side wall. The shell is arranged at least partially around the side wall. The cooling tube is connected to the shell to cool the terminal pin. In this way, during an operating process of the power battery pack, when the terminal pin on the side wall of the cell assembly generates heat, the heat can be transferred to the shell and then dissipated via the shell to the cooling tube.Heat exchange takes place to dissipate heat and lower the temperature of the cell assembly's side wall. This avoids the situation where a small side surface area of ​​the cell assembly results in a small contact area for the terminal pin, which easily generates heat. Thanks to the conductive properties of the casing, heat can be dissipated from the cell assembly's side wall in a timely manner, resulting in improved performance of the power battery pack during charging and use.

[0014] Further aspects and advantages of the present application are partly set out in the following description and partly evident from the following description or result from the practical implementation of the present application. BRIEF DESCRIPTION OF THE DRAWINGS Fig. Figure 1 is a schematic representation of the structure of a power battery pack according to an embodiment of the present application; Fig. Figure 2 is a schematic representation of the structure of a cooling tube of a power battery pack according to an embodiment of the present application; Fig. Figure 3 is a first schematic representation of a partial cross-sectional structure of a power battery pack according to an embodiment of the present application; Fig. Figure 4 is a second schematic representation of a partial cross-sectional structure of a power battery pack according to an embodiment of the present application; Fig. Figure 5 is a schematic representation of the structure of a cell assembly of a power battery pack according to an embodiment of the present application; and Fig. Figure 6 is a schematic representation of a cross-sectional structure of a cell assembly of a power battery pack according to an embodiment of the present application. DESCRIPTION OF EXECUTION FORMS

[0015] Embodiments of the present application are described in detail below, with examples illustrated in the accompanying drawings. Identical or similar reference numerals denote identical or similar elements or elements with identical or similar functions. The embodiments described below with reference to the accompanying drawings are examples and serve only to explain the present application and are not to be construed as limiting the present application. All other embodiments that a person skilled in the art could arrive at without creative effort based on the embodiments of the present application fall within the scope of protection of the present application.

[0016] In the description and claims of this application, a feature referred to as "first(s)" or "second(s)" may explicitly or implicitly comprise one or more features. In the description of this application, "a plurality of" means two or more, unless otherwise specified. Furthermore, "and / or" in the description and claims denotes at least one of the related objects, and the sign " / " generally denotes an "or" relationship between the related objects.

[0017] In the description of the present application, it should be noted that any directional or positional relationship described by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "top", "bottom", "front", "back", "left", "right", "vertical", "horizontal", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumference", and the like is based on a directional or positional relationship illustrated in the accompanying drawings. This relationship serves only to facilitate and simplify the description of the present application and is not intended to indicate or imply that any device or element mentioned must have a particular orientation, be installed in a particular direction, or be operated in a particular direction. Therefore, these terms should not be interpreted as limiting the present application.

[0018] In the description of this application, the terms "installation", "connected to", or "connection" are to be understood in a broad sense, unless expressly stated and defined otherwise, for example, as a fixed connection, detachable connection, or integral connection; or as a mechanical connection or electrical connection; or as a direct connection, indirect connection via an intermediate medium, or internal communication between two elements. For a person skilled in the art, the specific meanings of the foregoing terms in this application may be interpreted according to a particular condition.

[0019] With reference to Fig. 1 to Fig. Figure 6 shows a schematic representation of the structure of a power battery pack according to an embodiment of the present application. The power battery pack can, in particular, comprise: a shell 10, a cell assembly 20, and a cooling tube 30.

[0020] The cell assembly 20 is connected to the shell 10. The cell assembly 20 comprises an upper wall 21 and a lower wall 22, which are arranged opposite each other, as well as a side wall that is connected between the upper wall 21 and the lower wall 22. A connecting pin 23 is arranged on the side wall. The shell 10 is arranged at least partially around the side wall. The cooling tube 30 is connected to the shell 10 to cool the connecting pin 23.

[0021] In this embodiment of the present application, during a working process of the power battery pack, when the terminal pin 23 on the side wall of the cell assembly 20 generates heat, the heat can be transferred to the shell 10 and then dissipated via the shell 10 to the cooling tube 30. Heat exchange takes place to achieve heat dissipation and a reduction in the temperature of the side wall of the cell assembly 20. The situation in which a small side area of ​​the cell assembly 20 results in the terminal pin 23 having a small conductive area and thus easily generating heat is avoided. Due to the conductive function of the shell 10, the heat can be dissipated from the side wall of the cell assembly in a timely manner, so that the power battery pack exhibits improved performance during charging and use.

[0022] For example, in this embodiment of the present application, a flowable cooling medium can be introduced into the cooling tube 30. The heat generated by the connecting pin 23 is absorbed by the cooling medium. As the cooling medium flows, the heat generated by the connecting pin 23 is dissipated to achieve heat dissipation and a reduction in the temperature of the side wall of the cell assembly 20.

[0023] In this embodiment of the present application, the cooling medium can be, for example, water. Water at a relatively low temperature, for example 5 °C, 10 °C, 12 °C, or the like, is introduced into the cooling tube 30 so that the cooling medium absorbs the heat generated by the connecting pin 23 to achieve cooling and temperature reduction. Furthermore, the cooling medium can also be an insulating liquid, such as mineral oil, synthetic oil, silicone oil, fluorinated liquid, or the like. The aforementioned material has a relatively high specific heat capacity to achieve a better cooling effect. In this embodiment of the present application, the specific type of cooling medium is not limited.

[0024] In particular, in this embodiment of the present application, the cooling tube 30 can be a concertina tube. The concertina tube can comprise a plurality of hollow channels. A flowing cooling medium can be introduced into each of the plurality of hollow channels, thereby providing improved thermal conductivity and temperature uniformity. In actual application, the inner diameters of the plurality of hollow channels can be set differently according to an arrangement of cell units in the cell assembly 20, a pressure drop requirement of a flow path, a cooling requirement of different areas, and a specific structural requirement. Of course, the inner diameters of the plurality of hollow channels can also be set to the same. This is not limited in this embodiment of the present application.

[0025] A cooling tube 30 may be present, and an entire cooling tube 30 is arranged around the circumference of the side wall of the cell assembly 20 to achieve cooling and temperature reduction. Additionally, there may be a plurality of cooling tubes 30, for example, 2, 3, or the like. The plurality of cooling tubes 30 are arranged in segments on the side wall of the cell assembly 20 to adapt to a specific structure of the cell assembly 20, thereby facilitating the avoidance of other parts and achieving greater flexibility. In this embodiment of the present application, the specific number and arrangement of the cooling tubes 30 cannot be limited.

[0026] For example, in this embodiment of the present application, the material of the cooling tube 30 can be a metal, such as aluminum or an aluminum alloy. Furthermore, the material of the cooling tube 30 can also be a composite material. In this embodiment of the present application, the specific material of the cooling tube 30 cannot be limited.

[0027] Optionally, in this embodiment of the present application, the cooling tube 30 comprises a plurality of subcooling tubes 31, and the plurality of subcooling tubes 31 are stacked along a direction from the upper wall 21 to the lower wall 22. In this way, it is advantageous to arrange a liquid inlet 32 ​​and a liquid outlet 33 on the same side of the cooling tube 30, which simplifies the manufacturing process. It is not necessary to arrange the liquid inlet 32 ​​and the liquid outlet 33 in different positions, thus simplifying the manufacturing process. For example, there can be 2, 3, or 4 subcooling tubes 31. In this embodiment of the present application, the specific number of subcooling tubes 31 is not limited.

[0028] In this embodiment of the present application, two adjacent subcooling tubes 31 are optionally connected to each other. In this way, the cooling medium can flow sequentially through the plurality of subcooling tubes 31. A circuit is formed in the plurality of subcooling tubes 31, and the consumption of the cooling medium can also be reduced.

[0029] Optionally, in this embodiment of the present application, the cooling tube 30 further comprises a liquid inlet 32 ​​and a liquid outlet 33. The liquid inlet 32 ​​is connected to one of the plurality of subcooling tubes 31, and the liquid outlet 33 is connected to another of the plurality of subcooling tubes 31. In this way, the cooling medium is introduced into the cooling tube 30 through the liquid inlet 32 ​​and discharged from the cooling tube 30 through the liquid outlet 33. Additionally, the flow rate of the cooling medium at the liquid inlet 32 ​​and at the liquid outlet 33 is controlled, so that the flow rate of the cooling medium in the cooling tube 30 can be regulated to improve the cooling effect.

[0030] In some optional embodiments of the present application, the liquid inlet 32 ​​and the liquid outlet 33 are provided on the same side of the plurality of subcooling tubes 31. In this way, it is advantageous to arrange both the liquid inlet 32 ​​and the liquid outlet 33 on the same side, thereby simplifying the manufacturing process, preventing the liquid inlet 32 ​​and the liquid outlet 33 from being arranged in different positions, and reducing manufacturing complexity.

[0031] Optionally, in this embodiment of the present application, there is a plurality of cell assemblies 20. The plurality of cell assemblies 20 are spaced apart from one another. A preset gap is provided between two adjacent cell assemblies 20, and the cooling tube 30 is at least partially embedded in the preset gap. In this way, the cooling tube 30 can also provide cooling and temperature reduction for the plurality of cell assemblies 20 of the heat generated by a side wall between two adjacent cell assemblies 20, so that the cooling tube 30 has a better cooling effect on each of the plurality of cell assemblies 20. The heat dissipation performance of the cell assembly 20 is improved.

[0032] For example, in this embodiment of the present application, there can be 2, 3, or 4 cell assemblies 20. The specific number of cell assemblies 20 cannot be limited in this embodiment of the present application. The preset gap can be determined according to an actual requirement based on the performance of the cell assembly and the like, so that two adjacent cell assemblies 20 have a suitable distance, for example, 20 mm or 30 mm. The specific value of the preset gap cannot be limited in this embodiment of the present application.

[0033] Optionally, in this embodiment of the present application, the shell 10 comprises a base plate and a side frame 12 connected to the base plate. The side frame 12 is arranged around the side wall of the cell assembly 20. The cooling pipe 30 is connected to the side frame 12. In particular, the base plate and the side frame 12 are enclosed to form a receiving space. The receiving space is configured to accommodate the cell assembly 20. The side frame 12 is arranged around the side wall of the cell assembly 20, thereby protecting the cell assembly 20 to a certain extent and improving its structural stability. The cooling pipe 30 is connected to the side frame 12.When the connecting pin 23 on the side wall of the cell assembly 20 generates heat, the heat is transferred from the side frame 12 to the cooling tube 30, so that the cell assembly 20 has both better structural stability and a better effect of temperature reduction and heat dissipation on the side wall of the cell assembly 20.

[0034] In some optional embodiments of the present application, a side frame 12 is also provided between two adjacent cell assemblies 20 in a plurality of cell assemblies 20, which is located in a central position on the base plate. The cooling tube 30 can be arranged separately on two sides of the side frame 12, thereby achieving better temperature reduction and heat dissipation at the side wall between two adjacent cell assemblies 20 and improving the heat dissipation effect.

[0035] For example, the cooling pipe 30 can be connected to the side frame 12 by gluing, welding, or the like. In this embodiment of the present application, the specific type of connection between the cooling pipe 30 and the side frame 12 cannot be limited. For example, the base plate and the side frame 12 can be made of a metal, such as an aluminum alloy or steel. The base plate and side frame 12 can also be made of high-strength composite materials. In this embodiment of the present application, the specific materials of the base plate and side frame 12 cannot be limited.

[0036] Optionally, in this embodiment of the present application, the side frame 12 is provided with a groove 13, and the cooling tube 30 is connected to the groove 13. In this way, the cooling tube 30 is more firmly connected to the shell 10, and the reliability of the connection between the cooling tube 30 and the side frame 12 is improved. Furthermore, the groove 13 also reduces the thickness of the side frame 12, enabling the side frame 12 to possess sufficient structural strength.

[0037] In this embodiment of the present application, the cell assembly 20 optionally comprises a plurality of cells 24, a connecting plate 25, and a first thermally conductive adhesive layer 26. The connecting pin 23 is arranged on a side wall of the cell 24. The connecting plate 25 is connected to the connecting pin 23. The first thermally conductive adhesive layer 26 is connected to the connecting plate 25. The shell 10 is connected to the first thermally conductive adhesive layer 26. The cooling tube 30 is connected to the shell 10 around the side wall of the cell 24. In this way, the first thermally conductive adhesive layer 26 can transfer the heat generated by the connecting pin 23 more quickly from the connecting plate 25 to the cooling tube 30, thereby improving the heat conduction rate, accelerating the cooling and temperature reduction of the cell assembly 20, and enhancing the heat dissipation effect.

[0038] In particular, cell 24 comprises a plurality of cell units. The connecting pin 23 is arranged on the cell unit. The cell unit can be a rechargeable secondary cell, such as a lithium iron phosphate cell or a ternary lithium cell. Cell 24 can be a combination of one or more different types of cell units. In this embodiment of the present application, a specific type of cell 24 cannot be limited.

[0039] In this embodiment of the present application, the connecting plate 25 can be connected to the terminal pins 23 of the plurality of cell units to achieve a series or parallel connection between the plurality of cell units. For example, the connecting plate 25 can be welded to the terminal pin 23 of the cell unit. The connecting plate 25 can be made of aluminum or an aluminum alloy. In this embodiment of the present application, the specific material of the connecting plate 25 cannot be limited.

[0040] In this embodiment of the present application, the first thermally conductive adhesive layer 26 is an insulating material. For example, the first thermally conductive adhesive layer 26 can be a structural adhesive, silica gel, silicone grease, or another material with a thermally conductive function. The specific material of the first thermally conductive adhesive layer 26 cannot be limited in this embodiment of the present application.

[0041] Optionally, the cell 24 is provided with an explosion-proof valve and a liquid injection port. The first thermally conductive adhesive layer 26 is provided with a first escape hole and a second escape hole. The explosion-proof valve is exposed through the first escape hole, and the liquid injection port is exposed through the second escape hole. Specifically, the explosion-proof valve is configured to protect the cell 24, and the first escape hole is arranged around the circumference of the explosion-proof valve, thus preventing any overlap between the first thermally conductive adhesive layer 26 and the explosion-proof valve from affecting the explosion-proof valve. The liquid injection port is configured to inject an electrolyte into the cell 24.The second bypass hole is arranged around the circumference of the liquid injection port, thus preventing any overlap between the first thermally conductive adhesive layer 26 and the liquid injection port from interfering with the injection of an electrolyte into the cell 24. Similarly, the connecting plate 25 is also provided with a bypass hole for the explosion-proof valve and a bypass hole for the liquid injection port. The bypass hole for the explosion-proof valve is configured to bypass the explosion-proof valve of the cell 24. The bypass hole for the liquid injection port is configured to bypass the liquid injection port of the cell 24.

[0042] In this embodiment of the present application, the power battery pack optionally further comprises a second thermally conductive adhesive layer 14, and the second thermally conductive adhesive layer 14 is connected between the shell 10 and the cooling tube 30. In this way, the second thermally conductive adhesive layer 14 can transfer the heat transferred to the shell 10 more quickly to the cooling tube 30, thereby further improving the heat conduction rate, accelerating the cooling and temperature reduction of the cell assembly 20, and improving the heat dissipation effect.

[0043] In this embodiment of the present application, the second thermally conductive adhesive layer 14 is an insulating material. For example, the second thermally conductive adhesive layer 14 can also be a structural adhesive, silica gel, silicone grease, or another material with a thermally conductive function. The specific material of the second thermally conductive adhesive layer 14 cannot be limited in this embodiment of the present application.

[0044] Optionally, the power battery pack also includes a liquid cooling plate 40, which is connected to the upper wall 21 of the cell assembly 20. In this way, the liquid cooling plate 40 cools and reduces the temperature of the heat generated by the upper wall 21 of the cell assembly 20 and interacts with the cooling tube 30, which cools and reduces the temperature of the side wall of the cell assembly 20. This results in both the upper wall 21 and the side wall of the cell assembly 20 being cooled and their temperature reduced, thus improving heat dissipation. Furthermore, a liquid cooling plate 40 can also be arranged on the bottom wall 22, thereby cooling and reducing the temperature of the heat generated by the bottom wall 22 of the cell assembly 20 and further improving the heat dissipation of the cell assembly 20.

[0045] In some optional embodiments of the present application, the power battery pack further comprises a third thermally conductive adhesive layer 41, and the third thermally conductive adhesive layer 41 is connected between the upper wall 21 of the cell assembly 20 and the liquid cooling plate 40. In this way, the third thermally conductive adhesive layer 41 can transfer the heat generated by the upper wall 21 of the cell assembly 20 more quickly to the liquid cooling plate 40, thereby further improving the heat conduction rate, accelerating the cooling and temperature reduction of the cell assembly 20, and improving the heat dissipation effect.

[0046] In this embodiment of the present application, the third thermally conductive adhesive layer 41 is an insulating material. For example, the third thermally conductive adhesive layer 41 can be a structural adhesive, silica gel, silicone grease, or another material with a thermally conductive function. The specific material of the third thermally conductive adhesive layer 41 cannot be limited in this embodiment of the present application.

[0047] In summary, the power battery pack described in this embodiment of the present application can have at least the following advantages.

[0048] In this embodiment of the present application, the power battery pack comprises a shell, a cell assembly, and a cooling tube. The cell assembly is connected to the shell. The cell assembly comprises an upper wall and a lower wall, which are arranged opposite each other, and a side wall connected between the upper wall and the lower wall. A terminal pin is arranged on the side wall. The shell is arranged at least partially around the side wall. The cooling tube is connected to the shell to cool the terminal pin. In this way, during an operating process of the power battery pack, when the terminal pin generates heat on the side wall of the cell assembly, the heat can be transferred to the shell and then, via the shell, to the cooling tube. Heat exchange takes place to achieve heat dissipation and a reduction in the temperature of the side wall of the cell assembly.The situation where a small side surface of the cell assembly results in a small contact area for the terminal pin, easily generating heat, is avoided. Thanks to the conductive properties of the casing, the heat can be dissipated from the side wall of the cell assembly in a timely manner, resulting in improved performance of the power battery pack during charging and use.

[0049] One embodiment of the present application provides for a vehicle. The vehicle includes the power battery pack.

[0050] The vehicle may, for example, be a small car, a medium-sized car, a sedan, a truck, a trailer, a CDV (Car Derived Van), an MPV (Multi-Purpose Vehicle), an SUV (Sport Utility Vehicle), and the like. In this embodiment of the present application, a specific vehicle type cannot be restricted.

[0051] The vehicle described in this embodiment of the present application can have at least the following advantages.

[0052] In this embodiment of the present application, the vehicle comprises the power battery pack. The power battery pack comprises: a shell, a cell assembly, and a cooling tube. The cell assembly is connected to the shell. The cell assembly comprises an upper wall and a lower wall, which are arranged opposite each other, and a side wall connected between the upper wall and the lower wall. A terminal pin is arranged on the side wall. The shell is arranged at least partially around the side wall. The cooling tube is connected to the shell to cool the terminal pin. In this way, during an operating process of the power battery pack, when the terminal pin on the side wall of the cell assembly generates heat, the heat can be transferred to the shell and then dissipated via the shell to the cooling tube.Heat exchange takes place to dissipate heat and reduce the temperature of the cell assembly's side wall. This avoids the situation where a small side surface area of ​​the cell assembly results in a small contact area for the terminal pin, which easily generates heat. Thanks to the conductive properties of the casing, heat can be dissipated from the cell assembly's side wall in a timely manner, resulting in improved performance of the power battery pack during charging and use.

[0053] In this specification, descriptions referring to a term such as "one embodiment," "some embodiments," "exemplaries," "examples," "specific examples," or "some examples" mean that certain features, structures, materials, or properties described in connection with that embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the foregoing terms do not necessarily refer to the same embodiment or example. Furthermore, the described specific features, structures, materials, or properties may be combined appropriately in one or more embodiments or examples.

[0054] Although the embodiments of the present application have been shown and described, it is understandable to a person skilled in the art that many changes, modifications, replacements and variations can be made to these embodiments without departing from the principles and purposes of the present application, and the scope of the present application is defined by the claims and their equivalents. QUOTES INCLUDED IN THE DESCRIPTION

[0000] This list of documents cited by the applicant was automatically generated and is included solely for the reader's convenience. The list is not part of the German patent or utility model application. The DPMA accepts no liability for any errors or omissions. Cited patent literature

[0000] CN 202321263848.4

[0001]

Claims

[1] Power battery pack, wherein the power battery pack comprises: a shell (10), a cell assembly (20) and a cooling tube (30); and the cell assembly (20) is connected to the shell (10), the cell assembly (20) comprises an upper wall (21) and a lower wall (22) arranged opposite each other, and a side wall connected between the upper wall (21) and the lower wall (22), a terminal pin (23) is arranged on the side wall, the shell (10) is arranged at least partially around the side wall and the cooling tube (30) is connected to the shell (10) to cool the terminal pin (23). [2] Power battery pack according to claim 1, wherein the cooling tube (30) comprises a plurality of subcooling tubes (31) and the plurality of subcooling tubes (31) are stacked along a direction from the upper wall (21) to the lower wall (22). [3] Power battery pack according to claim 2, wherein two adjacent subcooling tubes (31) are connected to each other. [4] Power battery pack according to claim 2 or 3, wherein the cooling tube (30) further comprises a liquid inlet (32) and a liquid outlet (33), wherein the liquid inlet (32) is connected to one of the plurality of subcooling tubes (31) and the liquid outlet (33) is connected to another of the plurality of subcooling tubes (31). [5] Power battery pack according to claim 4, wherein the liquid inlet (32) and the liquid outlet (33) are arranged on the same side of the plurality of subcooling tubes (31). [6] Power battery pack according to one of claims 1 to 5, wherein a plurality of cell assemblies (20) are provided, the plurality of cell assemblies (20) are spaced apart from each other, a preset gap is provided between two adjacent cell assemblies (20) and the cooling tube (30) is at least partially embedded in the preset gap. [7] Power battery pack according to any one of claims 1 to 5, wherein the shell (10) comprises a base plate and a side frame (12) connected to the base plate, the side frame (12) is arranged around the side wall of the cell assembly (20) and the cooling tube (30) is connected to the side frame (12). [8] Power battery pack according to claim 7, wherein the side frame (12) is provided with a groove (13) and the cooling tube (30) is connected to the groove (13). [9] Power battery pack according to any one of claims 1 to 5, wherein the cell assembly (20) comprises a plurality of cells (24), a connecting plate (25) and a first thermally conductive adhesive layer (26), and the connecting pin (23) is arranged on a side wall of each of the plurality of cells (24), the connecting plate (25) is connected to the connecting pin (23), the first thermally conductive adhesive layer (26) is connected to the connecting plate (25), the shell (10) is connected to the first thermally conductive adhesive layer (26), and the cooling tube (30) is connected to the shell (10) around the side wall of the cell (24). [10] Power battery pack according to claim 9, wherein the cell assembly (20) is provided with an explosion-proof valve and a liquid injection opening, and the first thermally conductive adhesive layer (26) is provided with a first escape hole and a second escape hole, and the explosion-proof valve is exposed from the first escape hole and the liquid injection opening is exposed from the second escape hole. [11] Power battery pack according to one of claims 1 to 5, wherein the power battery pack further comprises a second thermally conductive adhesive layer (14) and the second thermally conductive adhesive layer (14) is connected between the shell (10) and the cooling tube (30). [12] Power battery pack according to any one of claims 1 to 5, wherein the power battery pack further comprises a liquid cooling plate (40) and the liquid cooling plate (40) is connected to the upper wall (21) of the cell assembly (20). [13] Power battery pack according to claim 12, wherein the power battery pack further comprises a third thermally conductive adhesive layer (41) and the third thermally conductive adhesive layer (41) is connected between the upper wall (21) of the cell assembly (20) and the liquid cooling plate (40). [14] Vehicle, wherein the vehicle comprises the power battery pack according to any one of claims 1 to 13.

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