Liquid cooling assembly, battery box body and battery pack

Abstract

The utility model provides a liquid cooling assembly, a battery box body and a battery pack, the liquid cooling assembly comprises: a first liquid cooling plate, a second liquid cooling plate which is arranged below the first liquid cooling plate and is connected with the first liquid cooling plate, and an end face of the second liquid cooling plate facing the first liquid cooling plate is provided with a flow channel groove, the bottom of the flow channel groove protrudes out of the second liquid cooling plate in the direction away from the first liquid cooling plate; and the reinforcing plate is arranged below the second liquid cooling plate and connected with the second liquid cooling plate, the end face, facing the second liquid cooling plate, of the reinforcing plate is provided with a containing groove corresponding to the bottom of the flow channel groove, and the containing groove is used for containing the part with the bottom protruding out of the second liquid cooling plate. By applying the technical scheme of the utility model, the technical problem of short service life of the liquid cooling plate can be improved.

Description

Technical Field

[0001] The utility model relates to the technical field of battery packs, and in particular to a liquid cooling component, a battery box and a battery pack. Background Art

[0002] The rapid development of the new energy industry places higher demands on the thermal management technology of battery systems, and the structural design of liquid cooling plates is particularly important.

[0003] The liquid cooling plate is typically fixed to the lower case or tray of the battery pack, bearing some of the module's weight. Some prior art solutions utilize both the upper cover and the bottom plate of the battery case as liquid cooling plates. While this improves battery cooling and heat dissipation, the plate's inherent strength makes it vulnerable to damage from external impacts, shortening its service life and compromising the heat dissipation of the battery modules. Utility Model Content

[0004] The embodiments of the present utility model provide a liquid cooling assembly, a battery box, and a battery pack, which can improve the technical problem of short service life of a liquid cooling plate.

[0005] In the first aspect, an embodiment of the present invention provides a liquid cooling assembly, which includes: a first liquid cooling plate, a second liquid cooling plate, which is arranged below the first liquid cooling plate and connected to the first liquid cooling plate, and a flow channel groove is provided on the end surface of the second liquid cooling plate facing the first liquid cooling plate, and the bottom of the flow channel groove protrudes from the second liquid cooling plate in a direction away from the first liquid cooling plate; a reinforcing plate, which is arranged below the second liquid cooling plate and connected to the second liquid cooling plate, and the end surface of the reinforcing plate facing the second liquid cooling plate has a receiving groove corresponding to the bottom of the flow channel groove, and the receiving groove is used to accommodate the part of the flow channel groove protruding from the second liquid cooling plate.

[0006] In one embodiment, the first liquid cooling plate and / or the second liquid cooling plate are formed by welding a plurality of metal structures.

[0007] In one embodiment, the cross-sectional shape of the metal structure includes a trapezoid.

[0008] In one embodiment, a cross section of the flow channel groove along a first direction is a continuous U-shaped structure, and the first direction is parallel to a length direction of the second liquid cooling plate.

[0009] In one embodiment, the first liquid cooling plate, the second liquid cooling plate and the reinforcement plate are all provided with first connection holes, the first connection holes on the first liquid cooling plate, the second liquid cooling plate and the reinforcement plate are arranged corresponding to each other, and the first liquid cooling plate, the second liquid cooling plate and the reinforcement plate are connected and fixed by connecting parts passing through the first connection holes.

[0010] In one embodiment, the first connection hole is provided in the middle of the first liquid cooling plate.

[0011] In one embodiment, a plurality of first connection holes are provided, and the plurality of first connection holes are arranged in an array.

[0012] In one embodiment, the liquid cooling assembly further includes a liquid inlet joint and a liquid outlet joint, and the liquid inlet joint and the liquid outlet joint are respectively connected to the flow channel groove.

[0013] In a second aspect, an embodiment of the present invention provides a battery case, which includes the above-mentioned liquid cooling assembly; a frame, which is at least partially surrounded by a first liquid cooling plate of the liquid cooling assembly, and a receiving cavity is formed between the frame and the first liquid cooling plate, and the receiving cavity is used to receive the battery module.

[0014] In one embodiment, second connection holes are provided on the frame, the first liquid cooling plate of the liquid cooling assembly, the second liquid cooling plate of the liquid cooling assembly, and the reinforcement plate of the liquid cooling assembly, and the frame is connected and fixed to the first liquid cooling plate, the second liquid cooling plate, and the reinforcement plate by fasteners passing through the second connection holes.

[0015] In one embodiment, the second connection hole is disposed near an edge of the first liquid cooling plate.

[0016] In one embodiment, a plurality of second connection holes are provided, and the plurality of second connection holes are arranged at intervals along the circumference of the first liquid cooling plate.

[0017] In one embodiment, the frame is fixed to the first liquid cooling plate by welding.

[0018] In one embodiment, the frame includes a first frame, a second frame and a third frame connected in sequence, the first frame and the third frame are respectively located on both sides of the first liquid cooling plate, and a receiving structure is provided between the outer wall and the inner wall of the first frame and the third frame, and the receiving structure is used to receive the liquid cooling tube.

[0019] In one embodiment, the material of the frame includes aluminum or steel, and the material of the liquid cooling tube includes steel or rubber, wherein an isolation coating is further provided on the inner wall of the liquid cooling tube.

[0020] In one embodiment, the receiving structure is a circular hole and / or a square hole.

[0021] In one embodiment, there are multiple accommodating structures, and the multiple accommodating structures are arranged in sequence along the second direction, and the second direction is parallel to the height direction of the frame.

[0022] In one embodiment, the first frame and / or the third frame is an extruded aluminum profile structure.

[0023] In one embodiment, the inner sidewalls of the first frame and / or the third frame are both provided with buffer components.

[0024] In one embodiment, the inner sidewalls of the first frame and / or the third frame further have an avoidance groove recessed along the first direction, the avoidance groove extends along the second direction, and the first direction and the second direction are perpendicular to each other.

[0025] In a third aspect, an embodiment of the present invention provides a battery pack, which includes the above-mentioned battery case; and a battery module, which is arranged in the battery case.

[0026] By applying the technical solution of the present invention, a flow channel groove is provided on the second liquid cooling plate, and the flow channel groove protrudes from the second liquid cooling plate in a direction away from the first liquid cooling plate. In this way, when the battery module is deformed and generates expansion force, it is possible to prevent excessive expansion force from squeezing the flow channel groove and causing the flow channel groove to deform, thereby protecting the flow channel groove. At the same time, a reinforcing plate is provided under the second liquid cooling plate, and the end face of the reinforcing plate facing the second liquid cooling plate has a receiving groove corresponding to the flow channel groove. In this way, the protruding flow channel groove can be protected to prevent damage to the structure of the flow channel groove due to vibration and impact. In this way, the service life of the liquid cooling component can be improved to ensure the heat dissipation effect of the battery module. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0028] Figure 1 It is a three-dimensional schematic diagram of a liquid cooling assembly provided by an embodiment of the present utility model;

[0029] Figure 2 This is an exploded schematic diagram of a liquid cooling assembly provided by an embodiment of the present utility model;

[0030] Figure 3 is a structural schematic diagram of the second liquid cooling plate provided by an embodiment of the present invention from another perspective;

[0031] Figure 4 This is a three-dimensional schematic diagram of a battery box provided by an embodiment of the present utility model;

[0032] Figure 5 It is a three-dimensional schematic diagram of the first frame or the third frame provided by an embodiment of the present utility model;

[0033] Figure 6 It is a three-dimensional schematic diagram of a battery pack provided in an embodiment of the present utility model.

[0034] The above drawings include the following reference numerals:

[0035] 10. First liquid cooling plate;

[0036] 20. Second liquid cooling plate; 21. Flow channel;

[0037] 30. Reinforcement plate; 31. Accommodation slot;

[0038] 41. First connecting hole; 42. Second connecting hole;

[0039] 51. Liquid inlet connector; 52. Liquid outlet connector;

[0040] 60. Frame; 61. Accommodating cavity; 62. First frame; 63. Second frame; 64. Third frame;

[0041] 70. Accommodating structure;

[0042] 80. Buffer parts;

[0043] 90. Avoidance groove;

[0044] 100. Battery module;

[0045] X, first direction; Y, second direction. DETAILED DESCRIPTION

[0046] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative efforts shall fall within the scope of protection of the present invention.

[0047] like Figures 1 to 3 As shown, in the first aspect, an embodiment of the present invention provides a liquid cooling assembly, which includes: a first liquid cooling plate 10, a second liquid cooling plate 20, which is arranged below the first liquid cooling plate 10 and connected to the first liquid cooling plate 10, and the end surface of the second liquid cooling plate 20 facing the first liquid cooling plate 10 is provided with a flow channel 21, and the bottom of the flow channel 21 protrudes from the second liquid cooling plate 20 in the direction away from the first liquid cooling plate 10; a reinforcing plate 30, which is arranged below the second liquid cooling plate 20 and connected to the second liquid cooling plate 20, and the end surface of the reinforcing plate 30 facing the second liquid cooling plate 20 has a receiving groove 31 corresponding to the bottom of the flow channel 21, and the receiving groove 31 is used to accommodate the part of the flow channel 21 protruding from the second liquid cooling plate 20.

[0048] By applying the technical solution of the present invention, a flow channel groove 21 is provided on the second liquid cooling plate 20, and the flow channel groove 21 protrudes from the second liquid cooling plate 20 in a direction away from the first liquid cooling plate 10. In this way, when the battery module 100 is deformed and generates an expansion force, it is possible to prevent excessive expansion force from squeezing the flow channel groove 21 and causing the flow channel groove 21 to deform, thereby protecting the flow channel groove 21. At the same time, a reinforcing plate 30 is provided below the second liquid cooling plate 20. The end surface of the reinforcing plate 30 facing the second liquid cooling plate 20 has a receiving groove 31 corresponding to the flow channel groove 21. In this way, the protruding flow channel groove 21 can be protected to prevent damage to the structure of the flow channel groove 21 due to vibration and impact. In this way, the service life of the liquid cooling component can be improved to ensure the heat dissipation effect of the battery module 100.

[0049] In this application, X is the first direction and Y is the second direction.

[0050] In the present application, the first liquid cooling plate 10 and / or the second liquid cooling plate 20 are formed by welding together multiple metal structures. This can meet the use requirements of large-sized liquid cooling plates in this application. At the same time, welding can optimize the arrangement of individual components, reduce design waste, and improve the overall structural strength, thereby helping to extend the service life of the first liquid cooling plate 10 and the second liquid cooling plate 20. In the present application, the first liquid cooling plate 10 and the second liquid cooling plate 20 are both formed by welding together multiple metal structures, and after welding, the flow channel groove 21 is machined and formed on the second liquid cooling plate 20.

[0051] In one embodiment, the cross-sectional shape of the metal structure includes a trapezoid. In the present application, the contact surface of two adjacent metal structures is an inclined surface, which can increase the contact area of the two metal structures, thereby facilitating welding between the two and also improving the structural strength after welding.

[0052] Specifically, the cross-section of the flow channel 21 along the first direction is a continuous U-shaped structure, and the first direction is parallel to the length of the second liquid cooling plate 20. This configuration can maximize the contact area between the liquid cooling plate and the battery module 100, thereby improving the cooling effect of the liquid cooling assembly on the battery module 100.

[0053] Optionally, in other embodiments of the present application, the flow channel groove 21 can also be set to a square structure or an annular structure, etc., as long as the heat dissipation requirements of the liquid cooling component can be met.

[0054] In one embodiment, the first liquid cooling plate 10, the second liquid cooling plate 20 and the reinforcing plate 30 are all provided with a first connecting hole 41. The first connecting holes 41 on the first liquid cooling plate 10, the second liquid cooling plate 20 and the reinforcing plate 30 are arranged corresponding to each other, and the first liquid cooling plate 10, the second liquid cooling plate 20 and the reinforcing plate 30 are connected and fixed by connecting members passing through the first connecting holes 41. This arrangement can ensure the connection strength between the above structures. In the application, the first connecting hole 41 is a bolt hole, which not only facilitates the disassembly and installation between the structures, but also has a low cost for bolt fixing, thereby reducing the production cost of the device and facilitating mass production of the device.

[0055] In the present application, the axis of the first connecting hole 41 is parallel to the second direction, which not only facilitates processing, but also facilitates the assembly between the first liquid cooling plate 10, the second liquid cooling plate 20 and the reinforcing plate 30, thereby improving the installation efficiency between the first liquid cooling plate 10, the second liquid cooling plate 20 and the reinforcing plate 30.

[0056] Furthermore, the first connection hole 41 is provided in the middle of the first liquid cooling plate 10. This arrangement rationally utilizes the structure of the first liquid cooling plate 10 and does not occupy additional installation space, thereby facilitating miniaturization of the device.

[0057] Specifically, a plurality of first connection holes 41 are provided, and the plurality of first connection holes 41 are arranged in an array. By setting up the above structure, the first liquid cooling plate 10, the second liquid cooling plate 20 and the reinforcing plate 30 can be firmly connected, thereby ensuring the stability of the liquid cooling assembly during operation.

[0058] In one embodiment, the liquid cooling assembly further includes a liquid inlet connector 51 and a liquid outlet connector 52, each of which is in communication with the flow channel 21. This structure allows the coolant to circulate within the flow channel 21, dissipating heat from the battery module 100 in a timely manner and ensuring normal operation of the battery module 100.

[0059] like Figure 4 and Figure 5 As shown, in the second aspect, an embodiment of the present invention provides a battery case, which includes the above-mentioned liquid cooling assembly; a frame 60, which is at least partially surrounded by the first liquid cooling plate 10 of the liquid cooling assembly, and the frame 60 and the first liquid cooling plate 10 form a receiving cavity 61, which is used to accommodate the battery module 100.

[0060] In one embodiment, the frame 60, the first liquid cooling plate 10 of the liquid cooling assembly, the second liquid cooling plate 20 of the liquid cooling assembly, and the reinforcing plate 30 of the liquid cooling assembly are all provided with second connection holes 42. The frame 60 is connected and fixed to the first liquid cooling plate 10, the second liquid cooling plate 20, and the reinforcing plate 30 by fasteners penetrating the second connection holes 42. In the application, the second connection holes 42 are FDS (rotary tapping rivet) punched holes. This arrangement can ensure the connection strength of the frame 60, the first liquid cooling plate 10 of the liquid cooling assembly, the first liquid cooling plate 10 of the liquid cooling assembly, and the reinforcing plate 30 of the liquid cooling assembly, thereby facilitating the overall structural strength of the battery case to meet the use requirements of the battery case.

[0061] In the present application, the second connection hole 42 is provided close to the edge of the first liquid cooling plate 10 .

[0062] In one embodiment, a plurality of second connection holes 42 are provided, and the plurality of second connection holes 42 are spaced apart along the circumference of the first liquid cooling plate 10. This structure ensures a secure connection between the frame 60, the first liquid cooling plate 10, the second liquid cooling plate 20, and the reinforcing plate 30, thereby ensuring the stability of the liquid cooling assembly during operation.

[0063] Optionally, the frame 60 may also be configured to be welded and fixed to the first liquid cooling plate 10 . The specific connection conditions should be selected according to the use environment of the device, as long as they can meet the use requirements of the device.

[0064] In one embodiment, the frame 60 includes a first frame 62, a second frame 63, and a third frame 64, which are connected in sequence. The first frame 62 and the third frame 64 are located on either side of the first liquid cooling plate 10. A receiving structure 70 is provided between the outer and inner walls of each of the first and third frames 62, 64. The receiving structure 70 is used to accommodate the liquid cooling tubes. This arrangement effectively utilizes the space between the first and third frames 62, 64, thereby saving space for the liquid cooling tubes.

[0065] In one embodiment, the frame 60 is made of aluminum or steel, and the liquid cooling tube is made of steel or rubber. An isolation coating is also provided on the inner wall of the liquid cooling tube. This prevents chemical reactions between the frame 60 and the liquid cooling tube, while the isolation coating prevents chemical reactions between the coolant and the liquid cooling tube, thereby ensuring the stability of the coolant flow within the liquid cooling tube. This facilitates cooling of the battery module 100 and maintains stable operation of the battery module 100.

[0066] Specifically, the receiving structure 70 is a circular hole and / or a square hole. In the present application, the receiving structure 70 is a circular hole. Of course, the receiving structure 70 should be configured according to the shape of the liquid cooling tube, which can improve the applicability and scope of application of the receiving structure 70.

[0067] In one embodiment, there are multiple accommodating structures 70, which are arranged in sequence along the second direction, which is parallel to the height direction of the frame 60. This arrangement can accommodate as many liquid cooling tubes as possible, thereby meeting the accommodation requirements of the device.

[0068] Furthermore, the first frame 62 and / or the third frame 64 are constructed of extruded aluminum. Extrusion molding improves the aluminum's microstructure and mechanical properties. After quenching and aging, the mechanical properties in the longitudinal direction (extrusion direction) are significantly higher than those of similar products produced using other processing methods. This improves the structural strength of the device in this application, ensuring safety during use. Furthermore, the extruded product has high dimensional accuracy and good surface quality, thus meeting the device's operational requirements.

[0069] In one embodiment, a buffer member 80 is provided on the inner sidewalls of the first frame 62 and / or the third frame 64. In the present application, the buffer member 80 is specifically foam, which can prevent the sidewalls of the battery module 100 from colliding with the inner sidewalls of the first frame 62 and / or the third frame 64, thereby protecting the structure of the battery module 100 and extending its service life.

[0070] In the present application, the inner sidewalls of the first frame 62 and / or the third frame 64 further have an escape groove 90 recessed along the first direction and extending along the second direction. This arrangement allows the battery module 100 to be moved into the accommodating cavity 61 using an external clamp, and the escape groove 90 allows the clamp to extend into the accommodating cavity 61, thereby facilitating the transfer of the battery module 100 from the outside to the accommodating cavity 61.

[0071] like Figure 6 As shown, in a third aspect, an embodiment of the present invention provides a battery pack, which includes the above-mentioned battery case and a battery module 100 arranged in the battery case.

[0072] By applying the technical solution of the present invention, a flow channel groove 21 is provided on the second liquid cooling plate 20, and the flow channel groove 21 protrudes from the second liquid cooling plate 20 in a direction away from the first liquid cooling plate 10. In this way, when the battery module 100 is deformed and generates an expansion force, it is possible to prevent excessive expansion force from squeezing the flow channel groove 21 and causing the flow channel groove 21 to deform, thereby protecting the flow channel groove 21. At the same time, a reinforcing plate 30 is provided below the second liquid cooling plate 20. The end surface of the reinforcing plate 30 facing the second liquid cooling plate 20 has a receiving groove 31 corresponding to the flow channel groove 21. In this way, the protruding flow channel groove 21 can be protected to prevent damage to the structure of the flow channel groove 21 due to vibration and impact. In this way, the service life of the liquid cooling component can be improved to ensure the heat dissipation effect of the battery module 100.

[0073] 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.

[0074] 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.

[0075] 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.

[0076] 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.

[0077] 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.

[0078] 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 cooling component, characterized in that: The liquid cooling assembly comprises: First liquid cooling plate; a second liquid cooling plate, disposed below and connected to the first liquid cooling plate, wherein a flow channel is provided on an end surface of the second liquid cooling plate facing the first liquid cooling plate, and a bottom of the flow channel protrudes from the second liquid cooling plate in a direction away from the first liquid cooling plate; A reinforcing plate is arranged below the second liquid cooling plate and connected to the second liquid cooling plate. The end surface of the reinforcing plate facing the second liquid cooling plate has a receiving groove corresponding to the bottom of the flow channel groove, and the receiving groove is used to accommodate the portion of the flow channel groove protruding from the second liquid cooling plate.

2. The liquid cooling assembly according to claim 1, wherein: The first liquid cooling plate and / or the second liquid cooling plate are formed by welding a plurality of metal structures.

3. The liquid cooling assembly according to claim 2, characterized in that The cross-sectional shape of the metal structure includes a trapezoid.

4. The liquid cooling assembly according to claim 1, wherein: The cross section of the flow channel groove along the first direction is a continuous U-shaped structure, and the first direction is parallel to the length direction of the second liquid cooling plate.

5. The liquid cooling assembly according to any one of claims 1 to 4, characterized in that: The first liquid cooling plate, the second liquid cooling plate and the reinforcing plate are all provided with a first connecting hole, the first connecting holes on the first liquid cooling plate, the second liquid cooling plate and the reinforcing plate are arranged corresponding to each other, and the first liquid cooling plate, the second liquid cooling plate and the reinforcing plate are connected and fixed by connecting parts passing through the first connecting holes.

6. The liquid cooling assembly according to claim 5, characterized in that The first connection hole is provided in the middle of the first liquid cooling plate.

7. The liquid cooling assembly according to claim 5, characterized in that The number of the first connection holes is multiple, and the multiple first connection holes are arranged in an array.

8. The liquid cooling assembly according to any one of claims 1 to 4, characterized in that: The liquid cooling assembly further includes a liquid inlet joint and a liquid outlet joint, and the liquid inlet joint and the liquid outlet joint are respectively connected to the flow channel groove.

9. A battery box, characterized in that: The battery box includes: The liquid cooling assembly according to any one of claims 1 to 8; The frame is at least partially arranged around the first liquid cooling plate of the liquid cooling assembly. The frame and the first liquid cooling plate are combined to form a receiving cavity, and the receiving cavity is used to receive the battery module.

10. The battery box according to claim 9, characterized in that: The first liquid cooling plate, the second liquid cooling plate and the reinforcement plate of the liquid cooling assembly, as well as the frame are all provided with second connection holes, and the frame is connected and fixed to the first liquid cooling plate, the second liquid cooling plate and the reinforcement plate by fasteners passing through the second connection holes.

11. The battery case according to claim 10, characterized in that: The second connecting hole is arranged close to an edge of the first liquid cooling plate.

12. The battery case according to claim 10, characterized in that: A plurality of the second connection holes are provided, and the plurality of the second connection holes are arranged at intervals along the circumference of the first liquid cooling plate.

13. The battery case according to claim 9, characterized in that: The frame is fixed to the first liquid cooling plate by welding.

14. The battery case according to any one of claims 9 to 13, characterized in that: The frame includes a first frame, a second frame and a third frame connected in sequence. The first frame and the third frame are respectively located on both sides of the first liquid cooling plate. A accommodating structure is provided between the outer wall and the inner wall of the first frame and the third frame. The accommodating structure is used to accommodate the liquid cooling tube.

15. The battery case according to claim 14, characterized in that: The material of the frame includes aluminum or steel, and the material of the liquid cooling tube includes steel or rubber, wherein an isolation coating is further provided on the inner wall of the liquid cooling tube.

16. The battery case according to claim 14, characterized in that: The accommodating structure is a circular hole and / or a square hole.

17. The battery case according to claim 14, characterized in that: There are multiple accommodating structures, and the multiple accommodating structures are arranged in sequence along a second direction, and the second direction is parallel to the height direction of the frame.

18. The battery case according to claim 14, characterized in that: The first frame and / or the third frame are / is an extruded aluminum profile structure.

19. The battery case according to claim 14, wherein: The inner sidewalls of the first frame and / or the third frame are both provided with buffer components.

20. The battery case according to claim 14, characterized in that: The inner sidewall of the first frame and / or the third frame further has an avoidance groove recessed along a first direction, the avoidance groove extends along a second direction, and the first direction and the second direction are perpendicular to each other.

21. A battery pack, characterized in that: The battery pack includes: The battery case according to any one of claims 9 to 20; The battery module is arranged in the battery box.

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