Liquid-cooled battery pack and vehicle

Abstract

The utility model provides a liquid-cooled battery pack and a vehicle. The liquid-cooled battery pack comprises a box body which is provided with a first accommodating cavity, a liquid inlet and a liquid outlet, wherein the liquid inlet and the liquid outlet are communicated with the first accommodating cavity; the battery module is arranged in the first accommodating cavity, and the battery module is supported on the bottom surface of the first accommodating cavity; and the height of the liquid outlet relative to the bottom surface is lower than that of the top of the battery module relative to the bottom surface. By applying the technical scheme of the utility model, the technical problem of high production cost in related technologies can be improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to liquid cooling battery pack technical field, concretely relates to a liquid cooling battery pack and vehicle. BACKGROUND

[0002] In the related art, as the capacity of the battery pack is continuously improved, a lot of heat is generated in the battery pack during the working process, if the heat cannot be discharged in time, the temperature inside the battery pack will continue to rise, which will affect the service life of the battery pack, and even cause explosion, and further cause serious accidents.

[0003] The traditional battery pack cooling method is mostly immersion cooling, that is, the battery pack is directly filled with cooling liquid, so that it is fully immersed in the cooling liquid, which can cool the battery assembly, but the demand for cooling liquid is large, the production cost is high, and the economic benefit is relatively low. SUMMARY

[0004] The embodiment of the utility model provides a liquid cooling battery pack and vehicle, which can improve the technical problem of high production cost in the related art.

[0005] In a first aspect, the embodiment of the utility model provides a liquid cooling battery pack, which comprises: a box body having a first containing cavity, an inlet and an outlet communicating with the first containing cavity; a battery module arranged in the first containing cavity and supported on the bottom surface of the first containing cavity; wherein the height of the outlet relative to the bottom surface is lower than the height of the top of the battery module relative to the bottom surface.

[0006] In an embodiment, the liquid cooling battery further comprises a heat insulation pad, a plurality of heat insulation pads are arranged between the battery module and the inner wall of the first containing cavity, the two sides of the heat insulation pad are respectively in abutment with the side wall of the battery module and the inner wall of the first containing cavity, and the plurality of heat insulation pads on the same side of the battery module are arranged in the height direction of the liquid cooling battery pack, and the interval between the adjacent two heat insulation pads forms a flow channel.

[0007] In an embodiment, the liquid cooling battery further comprises a heat insulation pad, the battery module comprises: a plurality of battery cells arranged in the length direction of the liquid cooling battery pack; two end plates arranged at the two ends of the battery module in the length direction of the liquid cooling battery pack; wherein a plurality of heat insulation pads are arranged between the adjacent two battery cells and / or between the battery cell and the end plate, and the plurality of heat insulation pads on the same side of the battery cell are arranged in the height direction of the liquid cooling battery pack, and the interval between the adjacent two heat insulation pads forms a second flow channel.

[0008] In an embodiment, the liquid-cooled battery pack further comprises a thermal insulation member arranged between the side wall of the battery module and the inner wall of the first accommodating cavity, and a thermal insulation pad arranged between the side wall of the battery module and the side wall of the thermal insulation member, and the two sides of the thermal insulation pad abut against the side wall of the battery module and the side wall of the thermal insulation member respectively.

[0009] In an embodiment, the thermal insulation pad between the battery module and the inner wall of the first accommodating cavity extends along the length direction of the liquid-cooled battery pack; and / or, the thermal insulation pad between the adjacent two battery cells, or the thermal insulation pad between the battery cell and the end plate, extends along the width direction of the liquid-cooled battery pack.

[0010] In an embodiment, the accommodating cavity comprises a first end and a second end distributed along the length direction of the liquid-cooled battery pack, the liquid outlet is located at the first end of the first accommodating cavity, and the thermal insulation pad between the battery module and the inner wall of the first accommodating cavity extends from the first end to the second end.

[0011] In an embodiment, the liquid-cooled battery pack further comprises a sealing member arranged in the first accommodating cavity, the height of the sealing member relative to the bottom surface is higher than the height of the liquid outlet relative to the bottom surface, and the sealing member is used to prevent the leakage of the cooling liquid from the first accommodating cavity.

[0012] In an embodiment, the box body comprises a bottom plate having a cooling cavity and an opening communicating with the cooling cavity, the liquid inlet communicates with the cooling cavity, and the opening is arranged on the side of the bottom plate relative to the first accommodating cavity; a side plate arranged on the bottom plate along the circumferential direction of the bottom plate, and the bottom plate and the side plate form the first accommodating cavity; and a cover plate arranged on the side plate.

[0013] In an embodiment, the opening is arranged corresponding to the bottom of the battery cell; and / or, the opening is arranged corresponding to the interval between the adjacent two battery cells; and / or, the opening is arranged corresponding to the interval between the battery cell and the end plate.

[0014] In an embodiment, the opening comprises a circular hole and / or a square hole.

[0015] In an embodiment, the extension direction of the opening is perpendicular to the height direction of the liquid-cooled battery pack and the length direction of the liquid-cooled battery pack.

[0016] In an embodiment, the accommodating cavity comprises a first end and a second end distributed along the length direction of the liquid-cooled battery pack, and the cross-sectional area of the opening close to the first end is greater than the cross-sectional area of the opening close to the second end.

[0017] In an embodiment, the opening has a plurality of openings arranged on the bottom plate.

[0018] In an embodiment, the bottom plate and the side plate are integrally formed.

[0019] In an embodiment, the box further comprises a partition plate, the partition plate separates the space between the side plate and the bottom plate into a first accommodating cavity and a second accommodating cavity, and the second accommodating cavity is used for accommodating the electrical element.

[0020] In an embodiment, the height of the liquid inlet relative to the bottom surface is lower than the height of the liquid outlet relative to the bottom surface.

[0021] In a second aspect, the embodiments of the utility model provide a vehicle, the vehicle comprises the liquid cooled battery pack as described above.

[0022] The height of the liquid inlet in the first direction is set to be lower than the height of the liquid outlet in the first direction, and the height of the liquid outlet in the first direction is set to be lower than the height of the battery module in the first direction, so that the battery module is only partially immersed in the cooling liquid, the use amount of the cooling liquid is reduced, the production cost of the liquid cooled battery pack is reduced, and the batch production of the liquid cooled battery pack is facilitated. BRIEF DESCRIPTION OF DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the utility model, the following will briefly introduce the drawings needed to be used in the embodiment description, and obviously, the drawings in the following description are only some embodiments of the utility model, and for those skilled in the art, other drawings can also be obtained according to these drawings without creative labor.

[0024] Figure 1 It is the three-dimensional schematic view of the liquid cooled battery pack provided by the embodiments of the utility model;

[0025] Figure 2 It is the top view schematic view of the liquid cooled battery pack provided by the embodiments of the utility model;

[0026] Figure 3 It is Figure 2 The sectional view schematic view of A-A in Fig.

[0027] Figure 4 It is the three-dimensional schematic view of the part structure of the liquid cooled battery pack provided by the embodiments of the utility model;

[0028] Figure 5 It is the three-dimensional schematic view of the box provided by the embodiments of the utility model;

[0029] Figure 6 It is the three-dimensional schematic view of the heat insulation piece provided by the embodiments of the utility model;

[0030] Figure 7is a three-dimensional schematic view of the sealing element provided by the embodiment of the utility model;

[0031] Figure 8 is a three-dimensional schematic view of the battery module provided by the embodiment of the utility model;

[0032] Among them, the above-mentioned drawing includes the following figure marks:

[0033] 10, box body;11, first containing cavity;12, liquid inlet;13, liquid outlet;14, bottom plate;141, opening;15, side plate;16, cover plate;17, partition plate;18, second containing cavity;

[0034] 20, battery module;21, battery cell;22, end plate;

[0035] 30, heat insulation pad;

[0036] 40, heat insulation piece;

[0037] 50, sealing element;

[0038] X, the height direction of liquid-cooled battery pack;Y, the length direction of liquid-cooled battery pack;Z, the width direction of liquid-cooled battery pack. DETAILED DESCRIPTION

[0039] The technical scheme in the embodiments of the utility model will be described clearly and completely below in conjunction with the drawings in the embodiments of the utility model, and obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by the person skilled in the art without making creative efforts are within the protection scope of the utility model.

[0040] As Figures 1-8 Indicated, first aspect, the embodiment of the utility model provides a kind of liquid-cooled battery pack, and liquid-cooled battery pack includes: box body 10, with first containing cavity 11 and with first containing cavity 11 The liquid inlet 12 and liquid outlet 13 of communication;Battery module 20 is set in first containing cavity 11, and battery module 20 is supported in the bottom surface of first containing cavity 11;Wherein, the height of liquid outlet 13 relative to bottom surface is lower than the height of the top of battery module 20 relative to bottom surface.

[0041] By applying the technical solution of the present invention, the height of the liquid inlet 12 in the first direction is set to be lower than the height of the liquid outlet 13 in the first direction, and the height of the liquid outlet 13 in the first direction is set to be lower than the height of the battery module 20 in the first direction. By setting up the above structure, when the coolant flows into the first accommodating cavity 11 from the liquid inlet 12, it can cool the battery module 20 in the first accommodating cavity 11 and then flow out from the liquid outlet 13. Since the height of the liquid outlet 13 is lower than the height of the battery module 20, the battery module 20 is only partially immersed in the coolant. This can reduce the amount of coolant used, thereby reducing the production cost of the liquid-cooled battery pack and facilitating the mass production of liquid-cooled battery packs.

[0042] In one embodiment, the liquid-cooled battery further includes a thermal insulation pad 30. Multiple thermal insulation pads 30 are disposed between the battery module 20 and the inner wall of the first accommodating cavity 11. The two sides of the thermal insulation pad 30 abut the side wall of the battery module 20 and the inner wall of the first accommodating cavity 11, respectively. Multiple thermal insulation pads 30 located on the same side of the battery module 20 are spaced apart along the height of the liquid-cooled battery pack, with the gaps between adjacent thermal insulation pads 30 forming flow channels. This arrangement not only prevents heat from the battery module 20 from being transferred to the exterior of the liquid-cooled battery pack, but also utilizes the flow channels to evenly distribute the coolant within the first accommodating cavity 11, thereby improving the heat dissipation effect of the coolant.

[0043] Among them, the thermal insulation pad 30 can be set as a silicone thermal insulation pad 30, because silicone has the following advantages: Good elasticity and cushioning performance: Since the silicone pad has excellent elasticity and cushioning performance, it can effectively absorb and disperse impact force, thereby protecting the side wall of the battery module 20 and the inner wall of the first accommodating cavity 11 from collision during use, which may cause damage to its own structure. Therefore, it can protect the structure of the side wall of the battery module 20 and the inner wall of the first accommodating cavity 11, so as to further improve the service life of the side wall of the battery module 20 and the inner wall of the first accommodating cavity 11. High and low temperature resistance: Since silicone can maintain the stability of its physical and chemical properties in a wide temperature range, it can maintain its good elasticity and durability in both high and low temperature environments. Therefore, it can prevent heat conduction between the side wall of the battery module 20 and the inner wall of the first accommodating cavity 11 as much as possible, thereby effectively preventing the heat of the battery cell 21 from being transferred to other battery cells 21 when thermal runaway occurs, thereby ensuring the normal operation of the component. Excellent insulation performance: Because silicone has excellent insulation properties, it can effectively prevent the current generated between the battery cells 21 from winding, thereby ensuring the stability of the battery module 20 during use. Easy to process and shape: Because silicone can be processed and formed through molds, gaskets of various shapes and sizes can be produced to meet the needs of use in different environments. This can reduce the processing difficulty of the structure, thereby improving the production efficiency of the structure and reducing the implementation cost of the structure.

[0044] Optionally, in other embodiments of the present application, the thermal insulation pad 30 can also be set to aerogel, etc., as long as it can meet the use requirements of the device. The specific setting should be selected according to the use environment of the device, which can improve the applicability and scope of application of the device.

[0045] In the present application, X is the height direction of the liquid-cooled battery pack, Y is the length direction of the liquid-cooled battery pack, and Z is the width direction of the liquid-cooled battery pack.

[0046] In one embodiment, the liquid-cooled battery further includes a thermal insulation pad 30. The battery module 20 includes: a plurality of battery cells 21 spaced apart along the length of the liquid-cooled battery pack; and two end plates 22 disposed at either end of the battery module 20 along the length of the liquid-cooled battery pack. Multiple thermal insulation pads 30 are disposed between adjacent battery cells 21 and / or between a battery cell 21 and an end plate 22. Multiple thermal insulation pads 30 located on the same side of a battery cell 21 are spaced apart along the height of the liquid-cooled battery pack, with the gaps between adjacent thermal insulation pads 30 forming a second flow channel. This arrangement further enhances the heat dissipation between the battery cells 21, allowing the battery cells 21 to operate at a stable temperature, which is beneficial for improving the operational stability of the liquid-cooled battery pack.

[0047] In one embodiment, the liquid-cooled battery pack further includes a thermal insulator 40 disposed between the sidewalls of the battery module 20 and the inner wall of the first accommodating cavity 11. A thermal insulation pad 30 is disposed between the sidewalls of the battery module 20 and the sidewalls of the thermal insulator 40, with both sides of the thermal insulation pad 30 abutting the sidewalls of the battery module 20 and the sidewalls of the thermal insulator 40, respectively. This arrangement further reduces the amount of heat from the battery module 20 that diffuses outside the liquid-cooled battery pack, thereby improving the thermal insulation effect on the battery module 20 and facilitating the stable operation of other components.

[0048] In the present application, the thermal insulation member 40 can be set as a silicone pad or as other structures such as a mica board. The specific setting should be selected according to the use environment of the thermal insulation member 40, so as to improve the applicability and efficiency of the thermal insulation member 40.

[0049] In one embodiment, the thermal insulation pad 30 between the battery module 20 and the inner wall of the first accommodating cavity 11 extends along the length of the liquid-cooled battery pack. Alternatively, the thermal insulation pad 30 between two adjacent battery cells 21, or between a battery cell 21 and the end plate 22, extends along the width of the liquid-cooled battery pack. This arrangement not only facilitates the processing of the thermal insulation pad 30 but also facilitates the flow of coolant.

[0050] In one embodiment, the accommodating cavity includes a first end and a second end extending along the length of the liquid-cooled battery pack. The liquid outlet 13 is located at the first end of the first accommodating cavity 11, and the thermal insulation pad 30, located between the battery module 20 and the inner wall of the first accommodating cavity 11, extends from the first end to the second end. This arrangement can further improve the flow efficiency of the coolant, thereby enhancing the cooling effect of the liquid-cooled battery pack.

[0051] In one embodiment, the liquid-cooled battery pack further includes a seal 50 disposed within the first accommodating chamber 11. The seal 50 is positioned at a height relative to the bottom surface of the first accommodating chamber 11 that is higher than the height of the liquid outlet 13 relative to the bottom surface. The seal 50 is used to prevent coolant from leaking from the first accommodating chamber 11. This arrangement prevents excessive coolant flow from overflowing from the first accommodating chamber 11, thereby maintaining stable operation of the liquid-cooled battery pack.

[0052] In one embodiment, the housing 10 includes: a bottom plate 14 having a cooling cavity and an opening 141 communicating with the cooling cavity; a liquid inlet 12 communicating with the cooling cavity; and opening 141 disposed on the side of the bottom plate 14 opposite the first accommodating cavity 11; side plates 15 disposed circumferentially around the bottom plate 14, with the bottom plate 14 and side plates 15 together forming the first accommodating cavity 11; and a cover plate 16 disposed on the side plates 15. Coolant flows sequentially through the liquid inlet 12, the cooling cavity, and the opening 141 into the first accommodating cavity 11. This arrangement reduces the difficulty of machining the opening 141 while also improving the efficiency of coolant circulation. This improves the cooling efficiency of the liquid-cooled battery pack.

[0053] In one embodiment, the opening 141 is disposed corresponding to the bottom of the battery cell 21; and / or, the opening 141 is disposed corresponding to the space between two adjacent battery cells 21; and / or, the opening 141 is disposed corresponding to the space between the battery cell 21 and the end plate 22. This arrangement satisfies the heat dissipation requirements of the battery module 20 as much as possible, thereby maintaining stable operation of the battery module 20.

[0054] In one embodiment, the opening 141 includes a circular hole and / or a square hole. The above structure is simple and easy to process, which not only meets the flow requirements of the coolant, but also reduces the processing cost of the opening 141.

[0055] In one embodiment, the extension direction of the opening 141 is perpendicular to the height direction and the length direction of the liquid-cooled battery pack. This structure simplifies the processing of the opening 141, thereby improving the processing efficiency of the opening 141 and reducing the processing cost of the opening 141.

[0056] Optionally, in other embodiments of the present application, the opening 141 may also be configured as a triangle, trapezoid or other structure. The specific configuration should be selected based on the use environment of the device, as long as the flow requirements of the coolant can be met.

[0057] In one embodiment, the accommodating cavity includes a first end and a second end extending along the length of the liquid-cooled battery pack. The cross-sectional area of ​​the opening 141 near the first end is larger than the cross-sectional area of ​​the opening 141 near the second end. This arrangement allows for reasonable distribution of the coolant, thereby minimizing temperature differences between different battery cells 21 and facilitating normal operation of the battery cells 21.

[0058] In one embodiment, there are multiple openings 141 , which are spaced apart and arranged on the bottom plate 14 . This arrangement can increase the flow rate of the coolant, thereby improving the heat dissipation effect on the battery module 20 .

[0059] In one embodiment, the bottom plate 14 and side plates 15 are integrally molded. Because the integrally molded structure is manufactured through integral die-casting or injection molding, without the welds or connectors found in traditional structures, the bottom plate 14 and side plates 15 are more robust and can withstand greater forces and impacts. Furthermore, because the materials of the various components are tightly bonded, they are less likely to loosen or fall off, improving the overall stability and reliability of the bottom plate 14 and side plates 15. Furthermore, the integral molding process enables precise control of the product's size and shape during the manufacturing process, ensuring that the product meets design requirements, thereby improving the processing accuracy of the bottom plate 14 and side plates 15.

[0060] Optionally, the bottom plate 14 and the side plates 15 may also be configured as separate structures. The specific configuration should be selected according to the use environment of the device, which can improve the applicability and scope of application of the device.

[0061] In one embodiment, the housing 10 further includes a partition 17 that separates the space between the side panels 15 and the bottom panel 14 into a first accommodating chamber 11 and a second accommodating chamber 18. The second accommodating chamber 18 is used to accommodate electrical components. This arrangement prevents coolant in the first accommodating chamber 11 from flowing into the second accommodating chamber 18, thereby allowing the electrical components in the second accommodating chamber 18 to maintain normal operation.

[0062] In one embodiment, the height of the liquid inlet 12 relative to the bottom surface is lower than the height of the liquid outlet 13 relative to the bottom surface.

[0063] In a second aspect, an embodiment of the present invention provides a vehicle, which includes the liquid-cooled battery pack as described above.

[0064] By applying the technical solution of the present invention, the height of the liquid inlet 12 in the first direction is set to be lower than the height of the liquid outlet 13 in the first direction, and the height of the liquid outlet 13 in the first direction is set to be lower than the height of the battery module 20 in the first direction. By setting up the above structure, when the coolant flows into the first accommodating cavity 11 from the liquid inlet 12, it can cool the battery module 20 in the first accommodating cavity 11 and then flow out from the liquid outlet 13. Since the height of the liquid outlet 13 is lower than the height of the battery module 20, the battery module 20 is only partially immersed in the coolant. This can reduce the amount of coolant used, thereby reducing the production cost of the liquid-cooled battery pack and facilitating the mass production of liquid-cooled battery packs.

[0065] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0066] Unless otherwise specifically stated, the relative arrangement of the parts and steps, the numerical expressions and the numerical values ​​set forth in these embodiments do not limit the scope of the present invention. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship. The techniques, methods and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the techniques, methods and equipment should be considered as part of the authorization specification. In all examples shown and discussed here, any specific values ​​should be interpreted as being merely exemplary and not as limitations. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that similar numbers and letters represent similar items in the following figures, and therefore, once an item is defined in one figure, it does not need to be further discussed in subsequent figures.

[0067] In the description of the present invention, it needs to be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "horizontal, vertical, vertical, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention; the directional words "inside and outside" refer to the inside and outside relative to the outline of each component itself.

[0068] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used herein to describe the spatial positional relationship of a device or feature to other devices or features as shown in the figures. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figures. For example, if the device in the drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0069] In addition, it should be noted that the use of words such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Unless otherwise stated, the above words have no special meaning and therefore cannot be understood as limiting the scope of protection of this utility model.

[0070] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A liquid-cooled battery pack, characterized in that: The liquid-cooled battery pack includes: A box body having a first accommodating cavity and a liquid inlet and a liquid outlet communicated with the first accommodating cavity; a battery module, disposed in the first accommodating cavity, and the battery module is supported on the bottom surface of the first accommodating cavity; The height of the liquid outlet relative to the bottom surface is lower than the height of the top of the battery module relative to the bottom surface; the height of the liquid inlet relative to the bottom surface is lower than the height of the liquid outlet relative to the bottom surface.

2. The liquid-cooled battery pack according to claim 1, characterized in that: The liquid-cooled battery pack also includes a thermal insulation pad, and a plurality of the thermal insulation pads are arranged between the battery module and the inner wall of the first accommodating cavity. The two sides of the thermal insulation pad are respectively abutted against the side wall of the battery module and the inner wall of the first accommodating cavity, and the plurality of thermal insulation pads located on the same side of the battery module are arranged at intervals along the height direction of the liquid-cooled battery pack, and the interval between two adjacent thermal insulation pads forms a first flow channel.

3. The liquid-cooled battery pack according to claim 1, characterized in that: The liquid-cooled battery further includes a thermal insulation pad, and the battery module includes: A plurality of battery cells are arranged at intervals along the length direction of the liquid-cooled battery pack; Two end plates are respectively arranged at both ends of the battery module along the length direction of the liquid-cooled battery pack; Among them, multiple thermal insulation pads are arranged between two adjacent battery cells and / or between the battery cell and the end plate, and the multiple thermal insulation pads located on the same side of the battery cell are arranged at intervals along the height direction of the liquid-cooled battery pack, and the interval between two adjacent thermal insulation pads forms a second flow channel.

4. The liquid-cooled battery pack according to claim 3, characterized in that: The liquid-cooled battery pack also includes a thermal insulation member, which is arranged between the side wall of the battery module and the inner wall of the first accommodating cavity. The thermal insulation pad is arranged between the side wall of the battery module and the side wall of the thermal insulation member, and the two sides of the thermal insulation pad are respectively abutted against the side wall of the battery module and the side wall of the thermal insulation member.

5. The liquid-cooled battery pack according to claim 4, characterized in that: The thermal insulation pad located between the battery module and the inner wall of the first accommodating cavity extends along the length direction of the liquid-cooled battery pack; and / or, The thermal insulation pad located between two adjacent battery cells, or the thermal insulation pad located between the battery cell and the end plate, extends along the width direction of the liquid-cooled battery pack.

6. The liquid-cooled battery pack according to claim 5, characterized in that: The accommodating cavity includes a first end and a second end distributed along the length direction of the liquid-cooled battery pack. The liquid outlet is located at the first end of the first accommodating cavity. The thermal insulation pad located between the battery module and the inner wall of the first accommodating cavity extends from the first end to the second end.

7. The liquid-cooled battery pack according to claim 1, characterized in that: The liquid-cooled battery pack also includes a seal, which is arranged in the first accommodating cavity. The height of the seal relative to the bottom surface is higher than the height of the liquid outlet relative to the bottom surface. The seal is used to prevent the cooling liquid from leaking from the first accommodating cavity.

8. The liquid-cooled battery pack according to claim 3, characterized in that: The box includes: A bottom plate having a cooling cavity and an opening communicating with the cooling cavity, wherein the liquid inlet is communicated with the cooling cavity, and the opening is provided on a side of the bottom plate opposite to the first accommodating cavity; Side plates are arranged on the bottom plate along the circumference of the bottom plate, and the bottom plate and the side plates together form the first accommodating cavity; A cover plate is arranged on the side plate.

9. The liquid-cooled battery pack according to claim 8, characterized in that: The opening is arranged corresponding to the bottom of the battery cell; and / or, The opening is arranged corresponding to the interval between two adjacent battery cells; and / or, The opening is arranged corresponding to the interval between the battery core and the end plate.

10. The liquid-cooled battery pack according to claim 8, characterized in that: The opening includes a circular hole and / or a square hole.

11. The liquid-cooled battery pack according to claim 10, characterized in that: The extending direction of the opening is perpendicular to the height direction of the liquid-cooled battery pack and the length direction of the liquid-cooled battery pack.

12. The liquid-cooled battery pack according to claim 8, characterized in that: There are a plurality of openings, and the plurality of openings are arranged on the bottom plate at intervals.

13. The liquid-cooled battery pack according to claim 12, characterized in that: The accommodating cavity includes a first end and a second end distributed along the length direction of the liquid-cooled battery pack, and the cross-sectional area of ​​the opening close to the first end is larger than the cross-sectional area of ​​the opening close to the second end.

14. The liquid-cooled battery pack according to claim 8, characterized in that: The bottom plate and the side plates are an integrally formed structure.

15. The liquid-cooled battery pack according to claim 8, characterized in that: The box body further includes a partition plate, which divides the space between the side plate and the bottom plate into the first accommodating cavity and a second accommodating cavity, wherein the second accommodating cavity is used to accommodate electrical components.

16. A vehicle, characterized in that: The vehicle includes the liquid-cooled battery pack according to any one of claims 1-15.

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