Bottom plate, bottom plate assembly and battery pack

Abstract

The utility model provides a bottom plate, a bottom plate assembly and a battery pack. In the embodiment of the invention, the bottom plate comprises a protective layer and a buffer layer, the protective layer comprises a protective plate and reinforcing ribs, the reinforcing ribs are connected to one side, deviating from the battery module, of the protective plate, the buffer layer is arranged on one side, deviating from the battery module, of the protective layer, the buffer layer is provided with a groove facing the protective layer, and the reinforcing ribs are mounted in the groove. When the bottom plate is subjected to external impact, the buffer layer can perform buffer protection on the peripheries of the reinforcing ribs, the deformation quantity of the reinforcing ribs is reduced, the reinforcing ribs are prevented from being broken due to impact force, the structural stability of the protective layer is further improved, and the impact resistance of the bottom plate is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of batteries, in particular to a bottom plate, a bottom plate assembly and a battery pack. BACKGROUND

[0002] The battery pack plays a vital role in modern devices and systems, and the bottom plate of the battery pack can improve the impact resistance of the structural strength of the battery pack and ensure the safety of the battery during transportation and use. In the related art, the bottom plate of the battery pack is provided with a reinforcing rib to further improve the structural strength. However, under a huge impact, the reinforcing rib is prone to breakage, which weakens the support strength of the bottom plate and affects the safe use of the battery. CONTENT OF THE UTILITY MODEL

[0003] Embodiments of the present application provide a bottom plate, a bottom plate assembly and a battery pack, which can improve the technical problem that the reinforcing rib of the bottom plate is prone to breakage.

[0004] In a first aspect, embodiments of the present application provide a bottom plate, comprising:

[0005] A protective layer for bearing a battery module, the protective layer comprising a protective plate and a reinforcing rib, the reinforcing rib being connected to a side of the protective plate away from the battery module;

[0006] A buffer layer provided on a side of the protective layer away from the battery module, the buffer layer being provided with a groove facing the protective layer, and the reinforcing rib being installed in the groove.

[0007] In some embodiments, the protective layer comprises a plurality of reinforcing ribs, each reinforcing rib being provided obliquely away from the protective plate, the reinforcing rib comprising an end portion away from the protective plate, the end portion being spaced apart from the protective plate and forming a buffer space therebetween.

[0008] In some embodiments, the plurality of reinforcing ribs are oblique towards the same direction.

[0009] In some embodiments, the buffer layer is provided with a plurality of grooves, the plurality of grooves corresponding to the reinforcing ribs being oblique in the same direction, and one reinforcing rib being inserted into one groove.

[0010] In some embodiments, an included angle between each reinforcing rib and the protective plate is between 15° and 25°.

[0011] In some embodiments, a distance between two adjacent reinforcing ribs is between 25mm and 35mm.

[0012] In some embodiments, the plurality of reinforcing ribs are oblique in different directions.

[0013] In some embodiments, the buffer layer is provided with a plurality of grooves, and the plurality of grooves correspond to the reinforcing ribs being inclined in different directions, and one reinforcing rib is inserted into one groove.

[0014] In some embodiments, the protective layer comprises a plurality of reinforcing ribs, and each reinforcing rib comprises a plurality of rib bodies, and the plurality of rib bodies of the same reinforcing rib are inclined in different directions.

[0015] In some embodiments, the buffer layer comprises a plurality of groups of grooves, and each groove comprises a plurality of sub-grooves, and the plurality of sub-grooves of the same groove correspond to the rib bodies being inclined in different directions, and one rib body is inserted into one sub-groove.

[0016] In some embodiments, each rib body is arranged to be inclined away from another rib body and away from the protective plate, and an included angle between each rib body and the protective plate is the same.

[0017] In some embodiments, the plurality of reinforcing ribs are arranged to be spaced apart in a first direction, and / or;

[0018] the plurality of reinforcing ribs are arranged to be spaced apart in a second direction, and the second direction is perpendicular to the first direction.

[0019] In a second aspect, the present application provides a bottom plate assembly, comprising:

[0020] a bottom plate as described above;

[0021] a liquid cooling plate arranged on a side of the protective layer away from the buffer layer.

[0022] In a third aspect, the present application provides a battery pack, comprising

[0023] a frame;

[0024] a bottom plate assembly as described above, the bottom plate assembly is mounted on a bottom of the frame, and the frame and the bottom plate assembly form a containing cavity;

[0025] a battery module arranged in the containing cavity.

[0026] In some embodiments, the battery module comprises a plurality of battery groups arranged to be spaced apart, the battery pack further comprises a cross beam arranged between one end of the battery module and / or between two adjacent battery groups, the frame comprises oppositely arranged side plates, two ends of the cross beam are respectively connected to one side plate, the battery pack further comprises a fastener, the bottom plate assembly is provided with a through hole, the cross beam is provided with an opening corresponding to the through hole, and the fastener is arranged to pass through the through hole and the opening to fasten and connect the bottom plate assembly and the frame.

[0027] In some embodiments, the protection plate is arranged opposite to the frame body at least partially and is fixedly connected to the frame body.

[0028] In some embodiments, the battery pack further comprises a heat-conducting adhesive layer, which is bonded between the bottom plate assembly and the battery module.

[0029] In the embodiments of the present application, the bottom plate comprises a protection layer and a buffer layer, the protection layer 11 comprises a protection plate and a reinforcing rib, the reinforcing rib is connected to the side of the protection plate away from the battery module, the buffer layer 12 is arranged on the side of the protection layer away from the battery module, the buffer layer is provided with a groove facing the protection layer, and the reinforcing rib is installed in the groove. When the bottom plate is impacted by external impact, the buffer layer can buffer and protect the periphery of the reinforcing rib, reduce the deformation amount of the reinforcing rib, and avoid the reinforcing rib from being broken due to impact force, so as to further increase the structural stability of the protection layer and improve the impact resistance of the bottom plate. BRIEF DESCRIPTION OF DRAWINGS

[0030] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0031] Figure 1 is an explosion view of the battery pack provided by the embodiments of the present application;

[0032] Figure 2 is Figure 1 a structural schematic view of the protection layer and the buffer layer;

[0033] Figure 3 is Figure 1 another structural schematic view of the protection layer and the buffer layer;

[0034] Figure 4 is Figure 1 a side view of the protection layer; Figure 1 ;

[0035] Figure 5 is Figure 4 an enlarged view of the local part A;

[0036] Figure 6 is Figure 1 a side view of the protection layer; Figure 2 ;

[0037] Figure 7 is Figure 6 an enlarged view of the local part B;

[0038] Figure 8 is a structural diagram of the protective layer shown in Figure 1 Figure 1

[0039] Figure 9 is a structural diagram of the protective layer shown in Figure 1 Figure 2

[0040] Figure 10 is a structural diagram of the protective layer shown in Figure 1 Figure 3

[0041] Figure 11 is a structural diagram of the protective layer shown in Figure 1 Figure 4

[0042] Figure 12 is a top view of the battery pack shown in the present application Figure 1

[0043] Figure 13 is a sectional view along A-A of the battery pack shown in Figure 12

[0044] Figure 14 is an enlarged schematic view of part C shown in 13

[0045] Figure 15 is a top view of the battery pack shown in the present application Figure 2

[0046] Figure 16 is a sectional view along B-B of the battery pack shown in Figure 15

[0047] Figure 17 is an enlarged schematic view of part D shown in 16

[0048] Reference signs:

[0049] 100, battery pack; 101, frame body; 1011, side plate; 102, cross beam; 103, fastener; 1031, nut; 1032, bolt; 104, through hole; 1041, first threaded hole; 1042, second threaded hole; 1043, third threaded hole; 105, opening; 106, battery module;

[0050] 200, bottom plate assembly; 10, bottom plate; 11, protective layer; 111, protective plate; 112, reinforcing rib; 1121, end portion; 113, protrusion; 114, rib body; 12, buffer layer; 121, groove;

[0051] 20, liquid cooling plate; 21, first cooling plate; 22, second cooling plate. DETAILED DESCRIPTION​​​​​​​​​​​​

[0052] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work are within the scope of protection of the present application. In addition, it should be understood that the specific implementation described herein is only used to illustrate and explain the present application, and is not used to limit the present application. In the present application, the orientation words such as "upper" and "lower" generally refer to the upper and lower in the actual use or working state of the device, and specifically refer to the direction of the drawing surface in the drawings; and "inner" and "outer" refer to the outline of the device.

[0053] Please refer to Figures 1-3 , Figure 1 is an explosion diagram of a battery pack provided by the embodiments of the present application, Figure 2 is Figure 1 is a structural schematic view of the protective layer 11 and the buffer layer 12 shown in Figure 3 is Figure 1 is another structural schematic view of the protective layer 11 and the buffer layer 12. The present application provides a bottom plate 10, which can be applied to a battery pack 100. The bottom plate 10 includes a protective layer 11 and a buffer layer 12, and the protective layer 11 is used to bear a battery module 106.

[0054] The protective layer 11 includes a protective plate 111 and a reinforcing rib 112. The protective plate 111 is horizontally arranged below the battery module, and the reinforcing rib 112 is connected to the side of the protective plate 111 away from the battery module 106. The protective plate 111 can be a metal structure to improve the firmness and wear resistance of the protective plate 111. The reinforcing rib 112 can be integrally formed with the protective plate 111, which is used to improve the bearing capacity of the structure and increase the bending and torsional stiffness of the structure.

[0055] The buffer layer 12 is arranged on the side of the protective layer 11 away from the battery module 106. The buffer layer 12 is provided with a groove 121 facing the protective layer 11. Each reinforcing rib 112 corresponds to each groove 121. The shape of the groove 121 and the reinforcing rib 112 is matched, and the reinforcing rib 112 is installed in the groove 121. The buffer layer 12 can be a foamed material, such as foam, sponge, etc. When the bottom of the battery is impacted, the buffer layer 12 can play a role in buffering the impact, reducing the impact energy transmitted to the inside of the battery pack 100, and reducing the damage to the internal devices of the battery pack 100.

[0056] In the prior art, the structural strength is improved by arranging the reinforcing ribs 112 on the protective layer 11. When the protective layer 11 is impacted, the reinforcing ribs 112 and the protective layer 11 are simply arranged in a superimposed manner. When the bottom plate 10 is impacted, the reinforcing ribs 112 may be broken due to exceeding the bearing limit, which reduces the structural strength of the protective layer 11. The buffer layer 12 is provided with a groove 121 facing the protective layer 11, and the reinforcing ribs 112 are arranged in the groove 121. When the bottom plate 10 is impacted by external impact, the material of the buffer layer 12 covers the reinforcing ribs 112, which can buffer and protect the periphery of the reinforcing ribs 112, reduce the deformation amount of the reinforcing ribs 112, and avoid the reinforcing ribs 112 from being broken due to impact force, so as to further increase the structural stability of the protective layer 11 and improve the impact resistance of the bottom plate 10.

[0057] In some embodiments, the protective layer 11 includes a plurality of reinforcing ribs 112, each of which is arranged in a tilted manner away from the protective plate 111. The reinforcing rib 112 includes an end portion 1121 away from the protective plate 111, and the end portion 1121 and the protective plate 111 are arranged in a spaced manner and form a buffer space therebetween. It can be understood that the reinforcing rib 112 arranged in a tilted manner and the protective plate 111 form a triangular buffer space. The inclined surface of the reinforcing rib 112 can receive the impact force from the bottom and displace in the buffer space, so as to weaken the impact of the bottom on the body of the protective layer 11 and enhance the overall rigidity of the box body.

[0058] In addition, the reinforcing rib 112 arranged in a tilted manner in the groove 121 can reduce the space occupied by the reinforcing rib 112, thereby reducing the structural thickness of the bottom plate 10 and the volume of the battery pack 100.

[0059] Please refer to Figures 4-5 , Figure 4 is Figure 1 the side view of the protective layer shown in Figure 1 , Figure 5 is Figure 4 the enlarged view of the partial A. In some embodiments, a plurality of reinforcing ribs 112 are tilted in the same direction. The distance between two adjacent reinforcing ribs 112 can be the same or different. When the reinforcing ribs 112 are tilted in the same direction and have the same interval distance, the structure arrangement can be more compact, which is beneficial to improve the processing efficiency. For example, the included angle between each reinforcing rib 112 and the protective plate 111 is the same. For example, the included angle can be 15°, 18°, 20°, 22°, 25°, etc. The present application does not limit the same.

[0060] In some embodiments, the buffer layer 12 is provided with a plurality of grooves 121, and the plurality of grooves 121 correspond to the reinforcing ribs 112 tilted in the same direction, and one reinforcing rib 112 is arranged in one groove 121.

[0061] In some embodiments, the distance between two adjacent reinforcing ribs 112 is between 25mm and 35mm, such as 25mm, 28mm, 30mm, 33mm, 35mm.

[0062] In some examples, the plurality of reinforcing ribs 112 can be inclined towards the left direction simultaneously, or can be inclined towards the right direction simultaneously.

[0063] In some embodiments, the plurality of reinforcing ribs 112 are inclined towards different directions, such as the plurality of reinforcing ribs 112 can be divided into two parts, the first part near the left end is inclined towards the left direction, and the second part near the right end is inclined towards the right direction.

[0064] In some embodiments, the buffer layer 12 is provided with a plurality of grooves 121, the plurality of grooves 121 correspond to the reinforcing ribs 112 inclined towards different directions, and one reinforcing rib 112 is inserted into one groove 121.

[0065] In some examples, the plurality of reinforcing ribs 112 can be divided into two parts, the grooves 121 near the left end are inclined towards the left direction, and the grooves 121 near the right end are inclined towards the right direction, the first part of reinforcing ribs 112 near the left end are inserted into the grooves 121 near the left end, and the second part of reinforcing ribs 112 near the right end are inserted into the grooves 121 near the right end.

[0066] It should be noted that the left direction and the right direction are not specific directions, and the left direction and the right direction can be two directions away from each other in the side view of the protective layer 11.

[0067] Please refer to Figures 6-7 , Figure 6 is Figure 1 the side view of the protective layer shown in Figure 2 , Figure 7 is Figure 6 the enlarged view of part B shown in. In some embodiments, the protective layer 11 includes a plurality of reinforcing ribs 112, each reinforcing rib 112 includes a plurality of rib bodies 114, and the plurality of rib bodies 114 of the same reinforcing rib 112 are inclined towards different directions.

[0068] In some embodiments, the buffer layer includes a plurality of groups of grooves 121, each group of grooves includes a plurality of grooves 121, the plurality of grooves 121 of the same group of grooves correspond to the rib bodies 114 inclined towards different directions, the shape of each groove and each rib body 114 is adapted, and one rib body 114 is inserted into one groove 121.

[0069] In some examples, one reinforcing rib 112 includes two rib bodies 114, each rib body 114 is arranged to be inclined away from the other rib body 114 and away from the protective plate 111, and the included angle between each rib body 114 and the protective plate 111 is the same. The included angle can be 25°, 28°, 30°, 35°, etc., which is not limited in the present application. The two rib bodies 114 are inclined to form a splayed structure, and the included angle between each rib body 114 and the protective plate 111 is the same, forming a symmetrical structure. It can be understood that the symmetrically arranged rib bodies 114 can increase the supporting surface, improve the stability, and increase the impact resistance of the protective plate 111.

[0070] In some embodiments, the distance between two adjacent reinforcing ribs is between 30mm-40mm, such as 30mm, 32mm, 35mm, 40mm, etc.

[0071] Referring to Figures 8-9 , Figure 8 is a structural diagram of the protective layer 11 shown in Figure 1 , Figure 1 , Figure 9 is a structural diagram of the protective layer 11 shown in Figure 1 Figure 2 . In some embodiments, a plurality of reinforcing ribs 112 are arranged at intervals along a first direction, which can be the long side direction of the protective plate 111, i.e. a plurality of reinforcing ribs 112 are arranged along the long side direction of the protective plate 111, the length of the reinforcing rib 112 is the same as the length of the short side of the protective plate 111, and correspondingly, the length of the groove 121 is the same as the length of the short side of the protective plate 111. The reinforcing rib 112 can be a linear structure, or a splayed structure with two rib bodies.

[0072] Referring to Figures 10-11 , Figure 10 is a structural diagram of the protective layer 11 shown in Figure 1 Figure 3 , Figure 11 is a structural diagram of the protective layer 11 shown in Figure 1 Figure 4 . In some embodiments, a plurality of reinforcing ribs 112 are arranged at intervals along a second direction, which is perpendicular to the first direction, and the second direction can be the short side direction of the protective plate 111, i.e. a plurality of reinforcing ribs 112 are arranged along the short side direction of the protective plate 111, the length of the reinforcing rib 112 is the same as the length of the long side of the protective plate 111, and correspondingly, the length of the groove 121 is the same as the length of the long side of the protective plate 111. The reinforcing rib 112 can be a linear structure, or a splayed structure with two rib bodies 114.

[0073] ​​​​​​In some embodiments, the plurality of reinforcing ribs 112 can also be arranged obliquely along a third direction, which is a diagonal direction of the protective layer 111. The application does not limit the arrangement direction of the reinforcing ribs 112.

[0074] Please continue to refer to Figure 1 The application also provides a bottom plate assembly 200, which comprises the bottom plate 10 and the liquid cooling plate 20. Since a large amount of heat is generated when the battery works, the liquid cooling plate 20 arranged at the bottom of the battery module 106 can effectively take away the heat and keep the temperature of the battery within a safe range to prevent overheating. The liquid cooling plate 20 is arranged on the side of the protective layer 11 away from the buffer layer 12. The buffer layer 12 of the bottom plate 10 is arranged as foamed material, which can improve the heat preservation performance of the liquid cooling plate 20 and reduce heat dissipation below the liquid cooling plate 20, so as to ensure that the liquid cooling plate 20 can exchange heat with the battery module 106 above to the greatest extent.

[0075] In some embodiments, the liquid cooling plate 20 comprises a first cooling plate 21 and a second cooling plate 22, the second cooling plate 22 is connected to the protective layer 11, the second cooling plate 22 is provided with a flow channel, and the first cooling plate 21 is arranged on the side of the second cooling plate 22 away from the protective layer 11. Specifically, the second cooling plate 22 is arranged on the protective layer 11, the flow channel in the second cooling plate 22 comprises a plurality of branches, and the plurality of branches are arranged in a coil shape for heat exchange with the battery module 106. The side of the first cooling plate 21 away from the second cooling plate 22 can also be provided with an inlet pipe and an outlet pipe, and the inlet pipe and the outlet pipe are connected to the flow channel in the second cooling plate 22.

[0076] In some examples, the second cooling plate 22 and the first cooling plate 21, and the second cooling plate 22 and the upper surface of the protective layer 11 are connected by a curing agent such as glue. The connection by the curing agent such as glue can better adapt to thermal expansion and vibration between the liquid cooling plate 20 and the protective layer 11. In actual application, the connection can also be achieved by other ways, which are not limited in the application.

[0077] The application also provides a battery pack 100, which comprises a frame 101 and the bottom plate assembly 200 as described above, the bottom plate assembly 200 is arranged at the bottom of the frame 101, and the frame 101 and the bottom plate assembly 200 form a containing cavity. The battery pack 100 comprises the battery module 106, which is arranged in the containing cavity. The battery module 106 arranged in the containing cavity of the frame 101 can be better protected.

[0078] Please refer to Figures 12-14 , Figure 12 is a top view of the battery pack shown in the application Figure 1 , Figure 13 is Figure 12A cross-sectional view of the battery pack 100 along A-A is shown, Figure 14 is an enlarged view of the partial C shown in 13. In some embodiments, the battery module 106 includes a plurality of battery groups arranged at intervals, and the battery pack 100 further includes a crossbeam 102 arranged between one end of the battery module 106 and / or two adjacent battery groups. The frame 101 includes oppositely arranged side plates 1011, and the crossbeam 102 is connected to one of the side plates 1011 at each end. Arranging the crossbeam 102 can improve the stability of the frame 101, avoid structural deformation, and maintain the overall shape and function. The battery pack 100 further includes a fastener 103, the bottom plate assembly 200 is provided with a through hole 104, the crossbeam 102 is provided with an opening 105 corresponding to the through hole 104, and the fastener 103 is arranged in the through hole 104 and the opening 105 to fasten and connect the bottom plate assembly 200 and the frame 101.

[0079] Specifically, the battery pack 100 can include one crossbeam 102 arranged between two battery groups. The battery pack 100 further includes two crossbeams 102, one arranged at one end of the battery module 106 and the other arranged between two battery groups. Each crossbeam 102 is connected to the bottom plate assembly 200 by a fastener 103. The present application does not limit the position and number of crossbeams 102. Connecting the crossbeam 102 and the bottom plate assembly 200 by the fastener 103 can increase the structural stability between the frame and the bottom plate.

[0080] In some examples, the fastener 103 includes a nut 1031 and a bolt 1032, the through hole 104 includes a first screw hole 1041 in the buffer layer 12, a second screw hole 1042 in the protective layer 11, and a third screw hole 1043 in the liquid cooling plate 20. The first screw hole 1041, the second screw hole 1042, the third screw hole 1043, and the opening 105 are sequentially connected from bottom to top. The hole diameter of the first screw hole 1041 is larger than the hole diameters of the second screw hole 1042 and the third screw hole 1043. The nut 1031 sequentially passes through the first screw hole 1041, the second screw hole 1042, the third screw hole 1043, and the opening 105, and forms a sleeve structure by being deformed under tension. The bolt 1032 sequentially passes through the first screw hole 1041, the second screw hole 1042, the third screw hole 1043, and the opening, and is located in the sleeve structure. By fastening the nut 1031 and the bolt 1032, the crossbeam 102 and the bottom plate assembly 200 can form a stable whole, effectively avoiding loosening between the bottom plate assembly 200 and the frame 101, and the threaded structure can be easily disassembled and repaired.

[0081] Please refer to Figures 15-17 , Figure 15 is a top view of the battery pack 100 shown in the present applicationFigure 2 , Figure 16 is Figure 15 is a sectional view of the battery pack 100 along B-B, Figure 17 is an enlarged schematic view of the partial D shown by 16. In some embodiments, the protective plate 111 is at least partially and oppositely arranged with the frame 101, and is fixedly connected to the frame 101. Specifically, the frame 101 is a square structure, and the frame 101 includes the side plate 1011 as described above. The protective plate 111 includes a protruding portion 113 protruding from the buffer layer 12, and the protruding portion 113 is welded to the side plate 1011 to prevent further shaking of the protective layer 11.

[0082] In some embodiments, the battery pack 100 further includes a heat-conducting adhesive layer bonded between the bottom plate assembly 200 and the battery module 106. By bonding the heat-conducting adhesive layer with the battery module 106, the fixed connection between the bottom plate assembly 200 and the battery module 106 can be achieved, the probability of the bottom plate 10 being separated from the battery module 106 is reduced, and the heat can be effectively conducted to reduce the risk of battery overheating.

[0083] The above describes the embodiments of the present application in detail, and the principles and implementation manners of the present application are described by applying specific examples. The above description of the embodiments is only used to help understand the method of the present application and its core idea; meanwhile, for those skilled in the art, according to the idea of the present application, the specific implementation manner and application range can be changed, and the above description of the content of the present application should not be understood as a limitation.

Claims

1. A backplane, characterized by, include: A protective layer for supporting the battery module, the protective layer including a protective plate and reinforcing ribs, the reinforcing ribs being connected to the side of the protective plate opposite to the battery module; A buffer layer is provided on the side of the protective layer away from the battery module. The buffer layer has a groove facing the protective layer, and the reinforcing rib is installed in the groove.

2. The base plate of claim 1, wherein The protective layer includes a plurality of reinforcing ribs, each of which is inclined away from the protective plate. Each reinforcing rib includes an end away from the protective plate, and the end is spaced apart from the protective plate to form a buffer space between them.

3. The base plate of claim 2, wherein The multiple reinforcing ribs are inclined in the same direction.

4. The base plate of claim 3, wherein The buffer layer is provided with multiple grooves, and the multiple grooves are inclined in the same direction to correspond to the reinforcing ribs, with one reinforcing rib inserted into one groove.

5. The base plate of claim 3, wherein The included angle between each of the reinforcing ribs and the protective plate is between 15° and 25°.

6. The base plate of claim 3, wherein The distance between two adjacent reinforcing ribs is between 25mm and 35mm.

7. The base plate of claim 2, wherein The multiple reinforcing ribs are inclined in different directions.

8. The base plate of claim 7, wherein The buffer layer is provided with multiple grooves, and the multiple grooves are inclined in different directions corresponding to the reinforcing ribs, with one reinforcing rib inserted into one groove.

9. The base plate of claim 2, wherein, The protective layer includes a plurality of reinforcing ribs, each reinforcing rib including a plurality of rib bodies, the end of which is located on the rib body, and the plurality of rib bodies of the same reinforcing rib are inclined in different directions.

10. The base plate of claim 9, wherein The buffer layer includes multiple sets of grooves, each set of grooves includes multiple grooves, and the multiple grooves in the same set of grooves are inclined in different directions corresponding to the ribs, and one rib is inserted into one groove.

11. The base plate of claim 9, wherein Each of the ribs is inclined in a direction away from the other rib and away from the protective plate, and the included angle between each rib and the protective plate is the same.

12. The base plate of claim 9, wherein, The included angle between each of the ribs and the protective plate is between 25° and 35°.

13. The base plate of claim 9, wherein The distance between two adjacent reinforcing ribs is between 30mm and 40mm.

14. The floor panel according to any of the claims 2-13, characterized in that The plurality of the reinforcing ribs are spaced apart along the first direction, and / or; The plurality of reinforcing ribs are spaced apart along a second direction, which is perpendicular to the first direction.

15. A chassis assembly characterized by, include: The base plate as described in any one of claims 1-14; A liquid cooling plate is disposed on the side of the protective layer away from the buffer layer.

16. A battery pack, characterized by include Frame; The base plate assembly as claimed in claim 15, wherein the base plate assembly is mounted on the bottom of the frame, and the frame and the base plate assembly form a receiving cavity; The battery module is disposed within the receiving cavity; The battery module includes multiple battery packs spaced apart. The battery pack also includes a crossbeam, which is disposed at one end of the battery module and / or between two adjacent battery packs. The frame includes opposing side plates, and the two ends of the crossbeam are respectively connected to one of the side plates. The battery pack also includes fasteners. The base plate assembly has through holes, and the crossbeam has corresponding openings. The fasteners pass through the through holes and openings to securely connect the base plate assembly and the frame.

17. The battery pack of claim 16, wherein, The protective plate is at least partially disposed opposite to the frame and is fixedly connected to the frame.

18. The battery pack of claim 16, wherein, The battery pack further comprises a heat-conducting glue layer bonded between the bottom plate assembly and the battery module.

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