Body bottom structure and vehicle

Abstract

The utility model provides a vehicle body bottom structure and a vehicle, and the vehicle body bottom structure comprises two doorsill beams which are oppositely arranged; the first cross beam and the second cross beam are arranged at the front end and the rear end of the doorsill beams correspondingly, and the two doorsill beams, the first cross beam and the second cross beam define a mounting frame; the battery pack assembly comprises a shell, battery packs and a plurality of cooling plates, the battery packs and the cooling plates are arranged in the shell, the shell comprises a top plate, a bottom plate and connecting edges, the connecting edges are connected with the mounting frame, the battery packs are arranged between the adjacent cooling plates, coolant flow channels are formed in the cooling plates, and the tops of the cooling plates are connected with the top plate; the bottom of the cooling plate is connected with the bottom plate, and the cooling plate is connected with the mounting frame. The cooling plate integrates the functions of cooling the battery and the supporting beam at the same time, so that an original reinforcing cross beam and reinforcing longitudinal beam structure does not need to be arranged in the battery pack assembly, and the condition of member repetition between the battery pack assembly and the doorsill beam, the first cross beam and the second cross beam is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of new energy vehicles, and in particular to a vehicle body bottom structure and a vehicle. Background Art

[0002] The battery pack is a key component in new energy vehicles. In existing technology, the battery pack is typically located at the bottom of the vehicle body, between the two door sills. The battery pack comprises upper and lower shells, a battery pack, and a cold plate. Because the battery pack needs to have a certain load-bearing capacity (supporting the seats and passengers above), reinforcing beams are required around the battery pack shell. However, these reinforcement beams overlap with the vehicle body's center door sills, dash crossbeams, and rear floor crossbeams, leading to high costs for the lower body structure. Utility Model Content

[0003] Therefore, the technical problem to be solved by the present invention is to overcome the defect in the prior art that the structure of the battery pack in the vehicle and the lower structure of the vehicle body have duplicated components, resulting in high vehicle body costs, thereby providing a vehicle body bottom structure and a vehicle.

[0004] In order to solve the above problems, the utility model provides a vehicle body bottom structure, including: two oppositely arranged door sill beams; a first cross beam and a second cross beam, respectively arranged at the front and rear ends of the door sill beams, the two door sill beams, the first cross beam and the second cross beam forming a mounting frame; a battery pack assembly, arranged in the mounting frame, the battery pack assembly includes a shell and a battery pack and a plurality of cooling plates arranged inside the shell, the shell includes a top plate, a bottom plate and a connecting edge, the connecting edge is connected to the mounting frame, a battery pack is arranged between adjacent cooling plates, a coolant flow channel is arranged in the cooling plate, the top of the cooling plate is connected to the top plate, the bottom of the cooling plate is connected to the bottom plate, and the cooling plate is connected to the mounting frame.

[0005] Optionally, the battery pack assembly also includes a first adapter, which includes a first connecting part and a second connecting part. The first connecting part passes through the top plate and is sealed with the cooling plate, the second connecting part is isolated from the internal space of the shell, and the first crossbeam is connected to the second connecting part through a first fastener.

[0006] Optionally, the bottom structure of the vehicle body also includes a third cross beam, and the battery pack assembly also includes a second adapter. The two ends of the third cross beam are respectively connected to the two door sill beams, and the third cross beam is located between the first cross beam and the second cross beam. The second adapter includes a third connecting part and a fourth connecting part. The third connecting part passes through the top plate and is sealed with the cooling plate. The fourth connecting part is isolated from the internal space of the shell. The third cross beam is connected to the fourth connecting part through a second fastener.

[0007] Optionally, the vehicle body bottom structure also includes a front seat front cross beam, a front seat rear cross beam, a third fastener and a fourth fastener, the front seat front cross beam and the front seat rear cross beam are both connected to the mounting frame, the third fastener passes through the top plate, and the two ends of the third fastener are respectively connected to the front seat front cross beam and the cooling plate, the fourth fastener passes through the top plate, and the two ends of the fourth fastener are respectively connected to the front seat rear cross beam and the cooling plate.

[0008] Optionally, the bottom structure of the vehicle body also includes a seal, which is arranged between the mounting frame and the connecting edge. A plurality of first connecting holes are provided on the mounting frame, and a plurality of second connecting holes are provided on the connecting edge. The plurality of first connecting holes and the plurality of second connecting holes are arranged in one-to-one correspondence. The bottom structure of the vehicle body also includes a fifth fastener, which passes through the first connecting hole and the second connecting hole to fix the connecting edge on the mounting frame.

[0009] Optionally, the battery pack assembly further includes a sixth fastener and a seventh fastener, the sixth fastener being connected to the top of the cooling plate and sealed to the top plate, and the seventh fastener being connected to the bottom of the cooling plate and sealed to the bottom plate.

[0010] Optionally, the battery cooling plate also includes a side surface, the side surface is provided with a first side convexity, the first side convexity protrudes from the side surface of the cooling plate and is arranged close to the top plate, and / or, the side surface is provided with a second side convexity, the second side convexity protrudes from the side surface of the cooling plate and is arranged close to the bottom plate.

[0011] Optionally, the battery pack assembly further includes an end plate disposed at the end of the battery pack, and the cooling plate is connected to the end plate on a side facing the electrical compartment.

[0012] Optionally, the battery pack assembly also includes an end plate arranged at the end of the battery group, and the cooling plate protrudes from the end plate on the side away from the electrical compartment. The part of the cooling plate protruding from the end plate is provided with a first opening and a second opening connected to the coolant flow channel.

[0013] The utility model also provides a vehicle, comprising the above-mentioned vehicle body bottom structure.

[0014] The utility model has the following advantages:

[0015] In the technical solution of the present invention, in the battery pack assembly, the cooling plate can cool the battery pack through the coolant flow channel, and the top and bottom of the cooling plate are respectively connected to the top plate and bottom plate of the battery pack assembly shell, that is, the cooling plate can support the battery pack assembly shell. In addition, the cooling plate is connected to the support frame, so that the cooling plate serves as a load-bearing structure of the bottom structure of the vehicle body. Therefore, the above-mentioned cooling plate integrates the functions of cooling the battery and the support beam, so that the original reinforcing crossbeam and reinforcing longitudinal beam structure are no longer required in the battery pack assembly, reducing the duplication of components between the battery pack assembly and the door sill beam, the first crossbeam and the second crossbeam. At the same time, the cooling plate integrates the functions of cooling the battery and the support beam, and can also simplify the structure of the battery pack assembly, thereby reducing the cost of the bottom structure of the vehicle body. Therefore, the technical solution of the present invention solves the defect of the prior art that the structure of the battery pack in the vehicle and the lower structure of the vehicle body have duplicated components, resulting in high vehicle body costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0017] Figure 1 An exploded schematic diagram of the vehicle body bottom structure of the present application is shown;

[0018] Figure 2 Shown Figure 1 A schematic diagram of the structure of the rocker beam, the first cross beam and the second cross beam of the mid-body bottom structure;

[0019] Figure 3 Shown Figure 1 An exploded diagram of the battery pack assembly in the mid-body underbody structure;

[0020] Figure 4 Shown Figure 3 Exploded diagram of the battery pack, cooling plate, and end plate of the battery pack assembly;

[0021] Figure 5 Shown Figure 3 A schematic top view of the top plate of the battery pack assembly;

[0022] Figure 6 Shown Figure 3 A schematic top view of the bottom plate of the battery pack assembly;

[0023] Figure 7 Shown Figure 3Schematic diagram of the connection between the top of the cooling plate and the top plate of the battery pack assembly;

[0024] Figure 8 Shown Figure 3 Schematic diagram of the connection between the bottom of the cooling plate and the base plate of the battery pack assembly;

[0025] Figure 9 Shown Figure 3 The battery pack is along Figure 1 A cross-sectional schematic diagram in the X direction is shown;

[0026] Figure 10 Shown Figure 9 A in the middle is an enlarged schematic diagram;

[0027] Figure 11 Shown Figure 3 The battery pack is along Figure 1 Another cross-sectional schematic diagram in the X direction is shown;

[0028] Figure 12 Shown Figure 11 The enlarged schematic diagram of point B in the middle;

[0029] Figure 13 Shown Figure 12 The enlarged schematic diagram of point C in the middle;

[0030] Figure 14 Shown Figure 1 A schematic cross-sectional view of the mid-body bottom structure along the X direction;

[0031] Figure 15 Shown Figure 14 The enlarged schematic diagram of point D in the middle;

[0032] Figure 16 Shown Figure 1 A schematic cross-sectional view of the mid-body bottom structure along the Y direction;

[0033] Figure 17 Shown Figure 16 Enlarged schematic diagram at point D in the middle.

[0034] Description of reference numerals:

[0035] 10. Sill beam; 20. First crossbeam; 30. Second crossbeam; 40. Battery pack assembly; 401. Housing; 4011. Top plate; 4012. Bottom plate; 4013. Connecting edge; 4014. Second connecting hole; 402. Battery pack; 403. Cooling plate; 4031. Coolant flow channel; 4032. First side convex; 4033. Second side convex; 4034. Side surface; 4035. First opening; 4036. Second opening; 404. First adapter; 4 041. First connecting part; 4042. Second connecting part; 405. Second adapter; 4051. Third connecting part; 4052. Fourth connecting part; 406. Front seat front cross beam; 407. Front seat rear cross beam; 408. Third fastener; 409. Fourth fastener; 410. Sixth fastener; 411. Seventh fastener; 412. End plate; 413. Electrical compartment; 50. Third cross beam; 60. First connecting hole; 70. Fifth fastener; 80. Sealing part. DETAILED DESCRIPTION

[0036] The following is a clear and complete description of the technical solution of the present invention in conjunction with the accompanying drawings. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0037] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating positions or relationships, are based on the positions or relationships shown in the accompanying drawings and are intended solely to facilitate the description of this utility model and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0038] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, indirect connections through an intermediate medium, and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0039] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0040] like Figure 1 、 Figure 2 、 Figure 3 、 Figure 7 and Figure 8 As shown, an embodiment of a vehicle body bottom structure according to the present application includes two oppositely arranged door sill beams 10, a first crossbeam 20, a second crossbeam 30 and a battery pack assembly 40. The first crossbeam 20 and the second crossbeam 30 are respectively arranged at the front and rear ends of the door sill beam 10, and the two door sill beams 10, the first crossbeam 20 and the second crossbeam 30 form a mounting frame. The battery pack assembly 40 is arranged in the mounting frame. Furthermore, the battery pack assembly 40 includes a shell 401, a battery pack 402 and a plurality of cooling plates 403. The shell 401 includes a top plate 4011, a bottom plate 4012 and a connecting edge 4013, and the connecting edge 4013 is connected to the mounting frame. The battery pack 402 is arranged between adjacent cooling plates 403. A coolant flow channel 4031 is provided in the cooling plate 403, the top of the cooling plate 403 is connected to the top plate 4011, and the bottom of the cooling plate 403 is connected to the bottom plate 4012.

[0041] In the technical solution of this embodiment, in the battery pack assembly, a cooling plate 403 cools the battery pack 402 via coolant flow channels 4031. The top and bottom of the cooling plate 403 are connected to the top plate 4011 and bottom plate 4012 of the battery pack assembly 40 housing, respectively. This means that the cooling plate 403 supports the housing 401 of the battery pack assembly 40. Furthermore, the cooling plate 403 is connected to the support frame, making it a load-bearing component of the vehicle body's underbody structure. Therefore, the cooling plate 403 integrates both battery cooling and beam support functions, eliminating the need for the previously required reinforcing crossbeams and longitudinal beams within the battery pack assembly 40 and reducing the duplication of components between the battery pack assembly and the rocker beam 10, first crossbeam 20, and second crossbeam 30. Furthermore, the cooling plate 403's integrated battery cooling and beam support functions also simplifies the structure of the battery pack assembly 40, thereby reducing the cost of the vehicle body's underbody structure. Therefore, the technical solution of this embodiment solves the defect in the prior art that the structure of the battery pack in the vehicle and the lower structure of the vehicle body have duplicate components, resulting in high vehicle body costs.

[0042] First of all, it should be noted that in order to facilitate the description of the positional relationship between the various components, Figure 1 The front-rear direction of the vehicle is defined as the X direction, and the left-right direction of the vehicle is defined as the Y direction. The X direction is defined as the longitudinal direction, and the Y direction is defined as the lateral direction.

[0043] from Figure 1 and Figure 2It can be seen that the sill beam 10 extends along the X direction, and there are two sill beams 10 , which are arranged in parallel and opposite to each other, that is, the two sill beams 10 are distributed along the Y direction.

[0044] from Figure 1 and Figure 2 It can be seen that the first crossbeam 20 and the second crossbeam 30 extend along the Y direction and are arranged opposite each other, distributed along the X direction. The first crossbeam 20 is located on the front side of the vehicle body bottom structure, and the second crossbeam 30 is located on the rear side of the vehicle body bottom structure. The two ends of the first crossbeam 20 are respectively connected to the two door sill beams 10, and the two ends of the second crossbeam 30 are respectively connected to the two door sill beams 10. Therefore, the two door sill beams 10, the first crossbeam 20, and the second crossbeam 30 enclose a closed mounting frame, and the mounting frame is generally square. The battery pack assembly 40 is installed within the mounting frame.

[0045] like Figure 3 As shown, the battery pack assembly 40 includes a shell 401, wherein the shell 401 includes an upper shell and a lower shell, and the upper shell is snapped onto the lower shell and encloses an installation space. The upper shell and the lower shell are optionally both stamped sheet metal parts. The upper shell includes an edge, and the other positions except the edge are raised upward to form a top plate 4011. The lower shell also includes an edge, and the other positions except the edge are recessed downward to form a bottom plate 4012. During assembly, the battery pack 402 and the cooling plate 403 are installed in the space between the top plate 4011 and the bottom plate 4012. The edge of the upper shell and the edge of the lower shell abut and contact to form the above-mentioned connecting edge 4013, which is used to fix the battery pack assembly 40 on the above-mentioned mounting frame.

[0046] Further, if Figure 5 and Figure 6 As shown, in the direction toward the rear of the vehicle, the upper shell and the lower shell have contracting oblique edges, so that the rear side of the shell 401 (the side toward the rear of the vehicle) is approximately trapezoidal in shape. In this embodiment, the space between the two contracting oblique edges forms an electrical compartment 413 (with power control components arranged inside). Optionally, Figure 5 As shown, a square maintenance window is provided on the upper shell, and the maintenance window corresponds to the electrical compartment 413. When the battery pack assembly 40 works abnormally, the operator can inspect the electrical components in the electrical compartment through the maintenance window.

[0047] Optionally, the outer surface of the upper shell of the shell 401 in this embodiment directly serves as the floor of the vehicle and bears the weight of the seats and passengers.

[0048] Of course, the housing 401 is not limited to the above structure and shape, and those skilled in the art can adjust the specific structure of the housing 401 according to actual needs.

[0049] Further, if Figure 3 As shown, a battery pack 402 is provided in the housing 401 of the battery pack assembly 40, wherein the battery pack 402 can be provided in two ways. One is as follows Figure 4 As shown, in this embodiment, there are multiple battery packs 402, each battery pack 402 includes multiple battery cells, the battery cells include a first surface facing the X direction, and a second surface facing the Y direction, and the first surfaces of adjacent battery cells are bonded together, so a single battery pack 402 extends along the X direction. Adjacent battery packs 402 are spaced apart along the Y direction, and adjacent battery packs 402 are arranged in parallel. The high-voltage busbars of each battery cell converge in the above-mentioned electrical compartment. In another embodiment not shown, the battery pack 402 can also be set as one, and the battery pack 402 includes a plurality of elongated batteries, and the plurality of elongated batteries are arranged in parallel.

[0050] like Figure 4 As shown, in the technical solution of this embodiment, a plurality of cooling plates 403 are further provided in the battery pack assembly 40. The cooling plate 403 is in the form of an elongated plate, which extends along the X direction. Furthermore, battery packs 402 are provided between adjacent cooling plates 403. When there are more than two battery packs 402, that is, cooling plates 403 are provided between adjacent battery packs 402, and cooling plates 403 are also provided on the outside of the outermost battery pack 402. Adjacent cooling plates 403 are spaced apart along the Y direction. In the above-mentioned embodiment in which only one battery pack 402 is provided, which is not shown, only two cooling plates 403 may be provided, that is, the battery pack is provided between the two cooling plates 403, and cooling plates 403 may also be provided between adjacent elongated batteries.

[0051] Furthermore, the side of the cooling plate 403 is bonded to and adhered to the second surface of the battery cell. Coolant is introduced into the coolant flow channel 4031 of the cooling plate 403 to achieve cooling and thermal management of the battery cell. The coolant flow channel 4031 can be of various shapes, such as S-shaped, C-shaped, etc., and a connector can be provided on the cooling plate 403, which is connected to the coolant flow channel 4031 to facilitate circulation of the coolant between the multiple cooling plates 403.

[0052] like Figure 7 and Figure 8As shown, the upper end of cooling plate 403 is connected to top plate 4011, and the lower end of cooling plate 403 is connected to bottom plate 4012. Therefore, cooling plate 403 supports and strengthens housing 401, that is, cooling plate 403 also functions as a support beam. Therefore, the original supporting crossbeams and longitudinal beams are no longer required within housing 401, simplifying the structure of battery pack assembly 40 and avoiding duplication of components within battery pack assembly 40 with rocker beam 10, first crossbeam 20, and second crossbeam 30.

[0053] Furthermore, the cooling plate 403 is also connected to the mounting frame, which means that the cooling plate 403 also serves as a load-bearing structure for the bottom structure of the vehicle body. Specifically, as mentioned above, the upper and lower shells of the shell 401 are both stamped sheet metal parts, so the thickness of the connecting edge 4013 is relatively thin. The connecting edge 4013 serves to assist in fixing the battery pack assembly 40 to the mounting frame. The main load-bearing of the battery pack assembly 40 is achieved by the cooling plate 403. Since the cooling plate 403 is also connected to the mounting frame, the weight of the seat and the occupant above acts directly on the cooling plate 403 and is transferred to the mounting frame through the cooling plate 403, so that the cooling plate 403 and the mounting frame jointly bear the weight of the seat and the occupant.

[0054] As described above, since the cooling plate 403 also supports and strengthens the housing 401 of the battery pack assembly 40, and needs to bear the weight of the seats and passengers above, as well as serve as a load-bearing structure for the bottom structure of the vehicle body, the cooling plate 403 in this embodiment requires relatively high strength. Optionally, the cooling plate 403 in this embodiment can be made of a high-strength alloy material, such as 6061 aluminum alloy, 6005 aluminum alloy, etc. This allows the cooling plate 403 to secure the battery pack 402 while the top and bottom of the cooling plate 403 are connected to the top plate 4011 and bottom plate 4012 of the housing 401, thereby improving the strength of the battery pack.

[0055] Of course, those skilled in the art can select the material of the cooling plate 403 according to actual needs, and is not limited to the above-mentioned 6061 aluminum alloy and 6005 aluminum alloy.

[0056] Furthermore, the cooling plate 403 in this embodiment is formed by extrusion, and after extrusion, the cooling plate 403 is a profile with uniform cross-sections. Those skilled in the art can select a die shape for the extrusion process based on actual cooling needs and the specific shape of the coolant flow channel 4031. The extruded profile can then be directly formed into the cooling plate 403 and the coolant flow channel 4031, thereby facilitating processing.

[0057] Those skilled in the art will appreciate that after the cooling plate 403 is extruded, both ends of the coolant flow channel 4031 are open, so it is necessary to provide a blocking structure at both ends of the cooling plate 403 to close the coolant flow channel 4031. The blocking structure may be a blocking head, a blocking plate, or the like.

[0058] Since the cooling plate 403 in this embodiment is made of aluminum alloy, the cooling plate 403 is processed by a metal extrusion molding process. In some embodiments not shown, the cooling plate 403 can also be made of a non-metallic material, which can be a plastic or heat-set plastic. In this case, the cooling plate 403 can be processed by a non-metallic technical molding process.

[0059] Preferably, whether the cooling plate 403 is made of metal or non-metal material, its thermal conductivity needs to be greater than or equal to 10 W / m·k to ensure good thermal conductivity.

[0060] In some embodiments not shown, the cooling plate 403 may also be formed by other processes, such as casting (lost foam casting), machining, etc.

[0061] like Figure 4 As shown, in the technical solution of this embodiment, the battery pack assembly 40 further includes an end plate 412 disposed at the end of the battery pack 402. The end plate 412 is located within the housing 401, and the cooling plate 403 is connected to the end plate 412. The end plate 412 serves to limit the installation position of the battery pack 402 and restrict expansion.

[0062] from Figure 4 It can be seen that each battery pack 402 is provided with an end plate 412 at both ends, and the end plate 412 contacts the first surface of the outermost battery cell. An adapter plate is provided on the cooling plate 403, and the end plate 412 is connected to the adapter plate. Figure 4 It can be seen that the two end plates 412 and the two cooling plates 403 enclose a rectangular space, which is also the installation space of a battery pack 402.

[0063] Furthermore, the connection methods between the two ends of the cooling plate 403 and the end plate 412 are different, as follows.

[0064] like Figure 4 As shown, on the side of the end plate 412 close to the electrical compartment 413 , the adapter plate is connected to the end position of the cooling plate 403 , that is, the end of the cooling plate 403 is connected to the end plate 412 on this side.

[0065] like Figure 4As shown, on the side of the end plate 412 facing away from the electrical compartment 413, the adapter plate is connected to the inner end of the cooling plate 403. That is, on this side, the end plate 412 is connected between adjacent cooling plates 403, and the end of the cooling plate 403 protrudes from the end plate 412. A first opening 4035 and a second opening 4036 are provided on the portion of the cooling plate 403 that protrudes from the end plate 412. The first opening 4035 and the second opening 4036 are both connected to the coolant flow channel 4031, and are used for coolant to flow into and out of the coolant flow channel 4031, respectively.

[0066] Furthermore, joints may be provided on the first opening 4035 and the second opening 4036 to facilitate connection with external pipelines.

[0067] from Figure 4 As can be seen, the number of end plates 412 at one end of the battery pack 402 is the same as the number of battery packs 402. For example, in this embodiment, if there are four battery packs 402, then there are four corresponding end plates 412. Each end plate 412 is located at the end of the corresponding column of battery packs 402. Furthermore, the cooling plates 403 located in adjacent battery packs 402 may be provided at their ends with two adapter plates, each of which is connected to the two end plates 412.

[0068] Furthermore, the multiple cooling plates 403 can be connected as a whole through the multiple end plates 412, so that the multiple cooling plates 403 act as an integral load-bearing component to jointly bear the weight of the seats and occupants above.

[0069] like Figure 9 and Figure 10 As shown, in the technical solution of this embodiment, the battery pack assembly 40 further includes a first adapter 404. The first adapter 404 includes a first connecting portion 4041 and a second connecting portion 4042. The first connecting portion 4041 passes through the top plate 4011 and is sealedly connected to the cooling plate 403. The second connecting portion 4042 is isolated from the internal space of the shell 401. The first crossbeam 20 is connected to the second connecting portion 4042 via a first fastener.

[0070] Specifically, the function of the first adapter 404 is to suspend the front portion of the battery pack assembly 40, facing the front of the vehicle, below the first cross member 20, making the cooling plate 403 a load-bearing component of the vehicle's underbody structure. In other words, the front portion of the cooling plate 403 is connected to the front portion of the mounting frame, and the weight of the vehicle's seats and occupants is transferred to the cooling plate 403 and then to the first cross member 20 via the first adapter 404. During assembly, the battery pack assembly 40 is placed and secured within the mounting frame, and the first cross member 20 and the first adapter 404 are then connected using the first fasteners.

[0071] Furthermore, before assembly to the mounting frame, it is necessary to ensure that the interior and exterior of the battery pack assembly 40 are sealed and isolated. Therefore, in this embodiment, the first adapter 404 includes a first connection portion 4041 and a second connection portion 4042. The first connection portion 4041 passes through the top plate 4011 and is sealedly connected to the cooling plate 403. Therefore, the first connection portion 4041 secures the first adapter 404 to the housing 401 and ensures the seal at the first adapter 404. The second connection portion 4042 is isolated from the interior space of the housing 401 to prevent external foreign matter from entering the battery pack assembly 40 through the first adapter 404 before assembly. During assembly, the first fastener is connected to the second connection portion 4042.

[0072] like Figure 10 As shown, the first adapter 404 is a screw structure with internal and external threads. A threaded hole is provided at the top position of the cooling plate 403, and a through hole is provided at the corresponding position of the top plate 4011. The first adapter 404 includes a nut and a stud. The external thread on the stud forms the above-mentioned first connecting portion 4041. The stud passes through the through hole and is tightened in the threaded hole to fix the first adapter 404 on the housing 401 and connect it to the cooling plate 403. In addition, a sealing ring surrounding the threaded hole can be provided on the top of the cooling plate 403, so that after the stud is screwed into the threaded hole, the sealing ring is squeezed and deformed, thereby achieving a seal at the through hole.

[0073] Further, from Figure 10 It can be seen that the top of the nut is provided with an inner hole extending inward, the inner diameter of the inner hole is smaller than the outer diameter of the stud, and the hole wall of the inner hole is provided with an internal thread, which forms the above-mentioned second connecting part 4042.

[0074] Furthermore, a connecting flange is provided on the first crossbeam 20, and a through hole is provided on the connecting flange. The first fastener includes a screw, which passes through the through hole on the connecting flange and is screwed into the internal thread of the first adapter 404, thereby fixing the first adapter 404 on the first crossbeam 20, so as to suspend the front side of the battery pack assembly 40 below the first crossbeam 20 and connect the front end of the cooling plate 403 to the bottom of the first crossbeam 20.

[0075] Furthermore, those skilled in the art can adjust the number of first adapters 404 based on actual needs. In this embodiment, four first adapters 404 are provided, with two first adapters 404 (distributed along the Y direction) forming a group. The two groups of first adapters 404 are arranged in mirror-image symmetry along the center of the battery pack assembly 40. Correspondingly, in this embodiment, threaded holes are provided at the ends of the four corresponding cooling plates 403.

[0076] Therefore, when other numbers of the first adapters 404 are selected, those skilled in the art can simply select the corresponding numbers and positions of the threaded holes on the top of the cooling plate 403 .

[0077] It should be noted that since the multiple cooling plates 403 are connected together via multiple end plates 412 to form a single unit, the aforementioned first adapter 404 only needs to be provided on at least some of the cooling plates 403. For example, in this embodiment, five cooling plates 403 are arranged in parallel, and the first adapter 404 is provided on only two cooling plates 403 (two first adapters 404 are provided on each cooling plate 403). To further increase the connection strength, those skilled in the art may provide the first adapter 404 on three cooling plates 403, four cooling plates 403, or all cooling plates 403.

[0078] like Figure 2 、 Figure 11 and Figure 12 As shown, in the technical solution of this embodiment, the vehicle body bottom structure also includes a third cross member 50, and the battery pack assembly 40 also includes a second adapter 405. The ends of the third cross member 50 are respectively connected to the two door sill beams 10, and the third cross member 50 is located between the first cross member 20 and the second cross member 30. The second adapter 405 includes a third connecting portion 4051 and a fourth connecting portion 4052. The third connecting portion 4051 passes through the top plate 4011 and is sealed to the cooling plate 403. The fourth connecting portion 4052 is isolated from the interior space of the housing 401. The third cross member 50 is connected to the fourth connecting portion 4052 via a second fastener.

[0079] Combine Figure 2 As can be seen, the third crossbeam 50 extends along the Y direction and is arranged parallel to the first crossbeam 20 and the second crossbeam 30, all of which are arranged along the X direction. The third crossbeam 50 is arranged close to the second crossbeam 30, that is, the third crossbeam 50 is located at the rear of the vehicle.

[0080] Furthermore, the third crossbeam 50 serves to strengthen the connection strength between the battery pack assembly 40 and the mounting frame. Figures 1 to 3 As described above, because the rear portion of the battery pack assembly 40 is the electrical compartment 413, each cooling plate 403 cannot extend to the second cross member 30. This means that the cooling plates 403 cannot be connected to the second cross member 30 via an adapter. Therefore, in this embodiment, the rear portion of the cooling plates 403 is connected to the third cross member 50 via a second adapter 405, securing the rear portion of the cooling plates 403 to the mounting frame. The weight of the vehicle's seats and occupants is transferred to the cooling plates 403 and then to the third cross member 50 via the second adapter 405.

[0081] Those skilled in the art will appreciate that the position between the second crossbeam 30 and the third crossbeam 50 corresponds to the inspection window of the electrical compartment 413 of the battery pack assembly 40 .

[0082] In some embodiments not shown, if the position of the electrical compartment 413 of the battery pack assembly 40 is adjusted so that each cooling plate 403 can extend to the bottom of the second crossbeam 30, the rear end of the cooling plate 403 can also be connected to the second crossbeam 30 through an adapter.

[0083] Furthermore, the function of the second adapter 405 is similar to that of the first adapter 404 described above. Its function is to suspend the rear-center portion of the battery pack assembly 40, facing the rear of the vehicle, below the third cross member 50, making the cooling plate 403 a load-bearing component of the vehicle body's underbody structure. During assembly, the battery pack assembly 40 is placed within the mounting frame, and the third cross member 50 and the second adapter 405 are then connected using the second fasteners.

[0084] Similar to the first adapter 404 described above, before assembly to the mounting frame, it is necessary to ensure that the interior and exterior of the battery pack assembly 40 are sealed and isolated. Therefore, in this embodiment, the second adapter 405 also includes a third connection portion 4051 and a fourth connection portion 4052. The third connection portion 4051 passes through the top plate 4011 and is sealedly connected to the cooling plate 403. Therefore, the third connection portion 4051 secures the second adapter 405 to the housing 401 and ensures the seal at the second adapter 405. The fourth connection portion 4052 is isolated from the interior space of the housing 401 to prevent external foreign matter from entering the battery pack assembly 40 through the second adapter 405 before assembly. During assembly, the second fastener is connected to the fourth connection portion 4052.

[0085] However, the specific form of the second adapter 405 is different from that of the first adapter 404, as follows:

[0086] from Figure 12 As can be seen, the second adapter 405 is composed of two parts: a plate and multiple screws. The plate is provided with two protrusions, each with a threaded hole. The plate also has through-holes through which the screws pass. The screws form the third connecting portion 4051, and the plate forms the fourth connecting portion 4052.

[0087] Furthermore, a threaded hole is provided at the top of the cooling plate 403, and a via is provided at a corresponding position on the top plate 4011. During assembly, the via of the plate is aligned with the via of the top plate 4011, and then a screw is passed through the two vias and tightened into the threaded hole, thereby securing the plate to the cooling plate 403. Furthermore, a sealing ring is provided on the top of the cooling plate 403, surrounding the threaded hole. When the screw is tightened into the threaded hole, the sealing ring is compressed and deformed, ensuring a seal at the two vias and preventing foreign matter from entering the battery pack assembly 40 through the two vias before assembly.

[0088] Optionally, the number and arrangement of the through holes on the plate body, the through holes on the top plate 4011, and the threaded holes on the cooling plate 403 are consistent. In this embodiment, three through holes are spaced apart along the X direction. Of course, those skilled in the art can also set the number and arrangement of the three according to actual needs.

[0089] Furthermore, the third crossbeam 50 is provided with a through-hole, and the second fastener comprises a screw. During assembly, the through-hole on the third crossbeam 50 is aligned with the threaded hole on the plate body of the second adapter 405. The screw is then passed through the through-hole and tightened into the threaded hole. This secures the second adapter 405 to the third crossbeam 50, thereby suspending the rear side of the battery pack assembly 40 below the third crossbeam 50 and connecting the rear end of the cooling plate 403 below the third crossbeam 50.

[0090] Furthermore, those skilled in the art can adjust the number of second adapters 405 based on actual needs. In this embodiment, three second adapters 405 are provided, spaced apart along the Y direction. Correspondingly, in this embodiment, threaded holes are provided at the top of the rear sides of the three corresponding cooling plates 403.

[0091] Therefore, when other numbers of second adapters 405 are selected, threaded holes can be opened on the top of the rear side of the cooling plate 403 corresponding in number and position.

[0092] It should be noted that, since the multiple cooling plates 403 are connected together via multiple end plates 412 to form a single unit, the aforementioned second adapter 405 only needs to be provided on at least some of the cooling plates 403. For example, in this embodiment, five cooling plates 403 are arranged in parallel, and the second adapter 405 is provided on only three of the cooling plates 403. To further enhance the connection strength, those skilled in the art may provide the second adapter 405 on four cooling plates 403, or on all cooling plates 403.

[0093] like Figure 2As shown, optionally, the first cross member 20 comprises a lower cross member of a front panel of the vehicle body, the second cross member 30 comprises a middle cross member of a rear floor, and the third cross member 50 comprises a front cross member of a rear floor of the vehicle body.

[0094] In some embodiments not shown, in the vehicle body structure, other cross-beam structures extending along the Y direction and located at the front may also serve as the first cross-beam 20. Other cross-beam structures extending along the Y direction and located at the rear may also serve as the second cross-beam 30. Other cross-beam structures extending along the Y direction and located at the middle and rear portion may also serve as the third cross-beam 50.

[0095] like Figure 2 、 Figure 11 and Figure 13 As shown, in the technical solution of this embodiment, the battery pack assembly further includes a front seat front crossbeam 406, a front seat rear crossbeam 407, a third fastener 408, and a fourth fastener 409. The third fastener 408 passes through the top plate 4011, and the two ends of the third fastener 408 are respectively connected to the front seat front crossbeam 406 and the cooling plate 403. The fourth fastener 409 passes through the top plate 4011, and the two ends of the fourth fastener 409 are respectively connected to the front seat rear crossbeam 407 and the cooling plate 403. The two ends of the front seat front crossbeam 406 are respectively connected to the two door sill beams 10, and the two ends of the front seat rear crossbeam 407 are respectively connected to the two door sill beams 10.

[0096] This arrangement further strengthens the connection between the cooling plate 403 and the mounting frame. In this embodiment, both the front seat front crossbeam 406 and the front seat rear crossbeam 407 are connected to the door sill beam 10 of the mounting frame. In the above structure, the front end of the cooling plate 403 is connected to the first crossbeam 20 via the first adapter 404, and the rear end of the cooling plate 403 is connected to the third crossbeam 50 via the second adapter 405. However, there is a long overhanging area in the middle of the cooling plate 403. This area directly bears the weight of the vehicle seats and occupants, posing a significant risk of fracture of the cooling plate 403. Therefore, in this embodiment, the front seat front cross beam 406 is connected to the cooling plate 403 by the third fastener 408, and the front seat rear cross beam 407 is connected to the cooling plate 403 by the fourth fastener 409, and the front seat front cross beam 406 and the front seat rear cross beam 407 are both connected to the two door sill beams 10, so that the middle part of the cooling plate 403 can be fixed to the mounting frame, that is, the front, middle and rear parts of the cooling plate 403 are all fixed to the mounting frame, which greatly improves the fixing strength.

[0097] Furthermore, the weight of the seats and passengers in the vehicle is transferred to the cooling plate 403 , and then transferred to the rocker beam 10 through the front seat front cross member 406 and the front seat rear cross member 407 .

[0098] Specifically, the front seat front crossbeam 406 and the front seat rear crossbeam 407 both extend along the Y direction and are spaced and arranged parallel to each other along the X direction. The front seat front crossbeam 406 and the front seat rear crossbeam 407 are used for assembling the front seats. As part of the battery pack assembly 40, they are pre-installed on the top plate 4011 of the housing 401. Furthermore, an adapter plate is provided on the door sill beam 10. During assembly, the ends of the front seat front crossbeam 406 and the front seat rear crossbeam 407 are connected to the adapter plate (via fasteners).

[0099] In an embodiment not shown, the front seat front cross beam 406 and the front seat rear cross beam 407 may also be pre-connected between the two door sill beams 10, that is, they are not part of the battery pack assembly 40. In this embodiment, when assembling the battery pack assembly, it is necessary to connect the cooling plate 403 to the front seat front cross beam 406 and the front seat rear cross beam 407 via an adapter. The structure of the adapter can refer to the structure of the first adapter 404 and the second adapter 405 described above.

[0100] Furthermore, the front seat front cross beam 406 and the front seat rear cross beam 407 are both made of rolled high-strength steel, and the yield strength of both is greater than 1000 MPa.

[0101] Furthermore, the third fastener 408 is used to secure the front seat front cross member 406 to the top of the cooling plate 403, and the fourth fastener 409 is used to secure the front seat rear cross member 407 to the top of the cooling plate 403. The cooperation between the front seat front cross member 406 and the third fastener 408 is substantially the same as the cooperation between the front seat rear cross member 407 and the fourth fastener 409. The cooperation between the front seat front cross member 406 and the third fastener 408 is described below:

[0102] from Figure 13 As can be seen, the front crossbars 406 of the front seats are long, parallel sections. A through-hole is provided on the top plate 4011 of the housing 401, and threaded holes are provided in the cooling plate 403 at positions corresponding to the through-holes. The third fastener 408 comprises a screw that passes through the profile, then through the hole, and then is tightened into the threaded hole, thereby securing the profile to the cooling plate 403. Optionally, a sealing ring can be provided around the threaded hole at the top of the cooling plate 403 to ensure a tight seal at the through-hole.

[0103] Furthermore, a connecting hole is provided at the end of the front seat front cross beam 406 , which is used to cooperate with the connecting hole of the adapter plate on the door sill beam 10 and is used for installation and fastening to fix the front seat front cross beam 406 on the door sill beam 10 .

[0104] from Figure 13Can see, top of the front seat front crossbeam 406 is also connected with slide rail by screw, and the front seat is connected on this slide rail. Certainly, according to the different structure of the seat of vehicle, also can directly seat be connected on the front seat front crossbeam 406, and slide rail is not set.

[0105] from Figure 13 As can be seen, the structure of the front seat rear cross member 407 is essentially the same as that of the front seat front cross member 406, except that the cross-sectional area and height of the profile of the front seat rear cross member 407 are smaller than those of the front seat front cross member 406. The front seat rear cross member 407 is located to the rear (of the vehicle) of the front seat front cross member 406. This arrangement allows the front portion of the seat surface to be slightly tilted when the front seat is installed, which is more in line with the comfortable sitting posture of the human body.

[0106] Furthermore, the fourth fastener 409 also includes a screw, and its installation method with the front seat rear cross beam 407 is the same as that of the third fastener 408 described above, so it will not be described in detail.

[0107] Furthermore, the front seat front cross beam 406 and the front seat rear cross beam 407 are both connected to all the cooling plates 403, that is, the front seat front cross beam 406 and all the cooling plates 403 are connected via the third fastener 408, and the front seat rear cross beam 407 and all the cooling plates 403 are connected via the fourth fastener 409, so as to increase the connection strength between the front seat front cross beam 406 and the front seat rear cross beam 407 and the cooling plates 403.

[0108] Furthermore, after the front seat front cross beam 406 and the front seat rear cross beam 407 are connected to the top plate 4011 through the third fastener 408 and the fourth fastener 409, they are also connected to the top plate 4011 by welding, thereby strengthening the connection between the two and the shell 401.

[0109] like Figures 14 to 17 As shown, in the technical solution of this embodiment, the mounting frame is provided with a plurality of first connection holes 60, and the connecting edge 4013 is provided with a plurality of second connection holes 4014, with the plurality of first connection holes 60 and the plurality of second connection holes 4014 being provided in a one-to-one correspondence. The vehicle body bottom structure further includes a fifth fastener 70, which passes through the first connection holes 60 and the second connection holes 4014 to secure the connecting edge 4013 to the mounting frame.

[0110] Specifically, the first crossbeam 20 is provided with a plurality of first connection holes 60, and the front side of the connecting edge 4013 is provided with a plurality of second connection holes 4014. The second crossbeam 30 is provided with a plurality of first connection holes 60, and the rear side of the connecting edge 4013 is provided with a plurality of second connection holes 4014. Both door sill beams 10 are provided with a plurality of first connection holes 60, and the sides of the connecting edge 4013 are provided with a plurality of second connection holes 4014. During assembly, the plurality of first connection holes 60 and the plurality of second connection holes 4014 are aligned one by one, and then the plurality of fifth fasteners 70 are passed through the plurality of first connection holes 60 and the plurality of second connection holes 4014, thereby securing the battery pack assembly 40 to the mounting frame.

[0111] like Figure 15 and Figure 17 As shown, the connection method at each first connecting hole 60 and the second connecting hole 4014 is basically the same, and a seal 80 (such as a sealing ring) is provided between the connecting edge 4013 and the mounting frame. When the fifth fastener 70 is assembled, the seal 80 can be compressed and deformed, thereby ensuring the seal between the connecting edge 4013 and the mounting frame.

[0112] Furthermore, the sealing member 80 is an annular sealing foam that surrounds the connection between the mounting frame and the connecting edge 4013 and is located inside the fifth fastener 70. When the fifth fastener 70 is assembled, the annular sealing foam is compressed and deformed, thereby ensuring a seal between the connecting edge 4013 and the mounting frame, and preventing foreign matter from entering the vehicle body through the gap between the mounting frame and the connecting edge 4013.

[0113] Furthermore, a limiting step is provided on the connecting edge 4013 , and the limiting step can limit the installation distance between the connecting edge 4013 and the installation frame.

[0114] from Figure 15 and Figure 17 It can be seen that the fifth fastener 70 includes a bolt and a nut. After the bolt passes through the second connection hole 4014 and the first connection hole 60 from bottom to top, the nut is tightened on the bolt, thereby fixing the connection edge 4013 on the mounting frame.

[0115] In this embodiment, the bolts and nuts facilitate installation and removal of the battery pack assembly 40, thereby facilitating maintenance or replacement of the battery pack assembly 40. In some embodiments not shown, the connecting edge 4013 and the mounting frame may also be connected by other means, such as welding.

[0116] like Figure 7 and Figure 8As shown, the battery pack assembly 40 further includes a sixth fastener 410 and a seventh fastener 411. The sixth fastener 410 is connected to the top of the cooling plate 403 and is sealed to the top plate 4011. The seventh fastener 411 is connected to the bottom of the cooling plate 403 and is sealed to the bottom plate 4012.

[0117] Specifically, the sixth fastener 410 is used to secure the top of the cooling plate 403 to the top plate 4011. The top of the cooling plate 403 is provided with a threaded hole, and the top plate 4011 has a corresponding through-hole. The sixth fastener 410 includes a screw that passes through the through-hole and is tightened into the threaded hole, thereby securing the top of the cooling plate 403 to the top plate 4011.

[0118] Furthermore, a sealing ring surrounding the threaded hole may be provided on the top of the cooling plate 403 so that when the screw is tightened into the thread, the sealing ring is compressed and deformed, thereby ensuring the sealing of the through hole.

[0119] Correspondingly, seventh fastener 411 is used to secure the bottom of cooling plate 403 to base plate 4012. The bottom of cooling plate 403 is provided with a threaded hole, and base plate 4012 has a corresponding through-hole. Seventh fastener 411 comprises a screw that passes through the through-hole and is tightened into the threaded hole, thereby securing the bottom of cooling plate 403 to base plate 4012.

[0120] Furthermore, a sealing ring surrounding the threaded hole may be provided at the bottom of the cooling plate 403 so that when the screw is tightened into the thread, the sealing ring is compressed and deformed, thereby ensuring the sealing of the through hole.

[0121] The sixth fastener 410 and the seventh fastener 411 are used to connect the two ends of the cooling plate 403 to the top plate 4011 and the bottom plate 4012 of the housing 401 of the battery pack assembly 40, respectively, so that the cooling plate 403 also functions as a support beam.

[0122] like Figure 7 As shown, in the technical solution of this embodiment, the cooling plate 403 further includes two side surfaces 4034, and the side surfaces 4034 of the cooling plate 403 are provided with first side protrusions 4032, which protrude from the side surfaces 4034 of the cooling plate 403. The first side protrusions 4032 are arranged near the top plate 4011, that is, the first side protrusions 4032 are arranged at the upper end of the cooling plate 403. Specifically, the first side protrusions 4032 are used to increase the contact area between the top of the cooling plate 403 and the top plate 4011, thereby facilitating the installation of the sixth fastener 410, and increasing the structural strength of the top of the cooling plate 403, as well as the support stability of the top plate 4011.

[0123] Optionally, the upper surface of the first side protrusion 4032 is flush with the upper surface of the cooling plate 403 , and the two together form a bearing surface, thereby increasing the connection strength between the cooling plate 403 and the top plate 4011 .

[0124] Furthermore, two first side protrusions 4032 are provided. The two first side protrusions 4032 are respectively located on two side surfaces 4034 of the cooling plate 403 , and the two first side protrusions 4032 are arranged in mirror symmetry with respect to the cooling plate 403 .

[0125] Of course, in some embodiments not shown, providing one first side protrusion 4032 on only one side surface 4034 of the cooling plate 403 is also a feasible embodiment.

[0126] like Figure 8 As shown, in the technical solution of this embodiment, the side surface 4034 of the cooling plate 403 is further provided with a second side convex 4033, and the second side convex 4033 protrudes from the side surface 4034 of the cooling plate 403. The second side convex 4033 is provided close to the bottom plate 4012, that is, the second side convex 4033 is provided at the lower end of the cooling plate 403. The second side convex 4033 increases the contact area between the bottom of the cooling plate 403 and the bottom plate 4012 on the one hand, and on the other hand, Figure 8 It can be seen that the second side protrusion 4033 also plays a role in supporting and positioning the top of the battery pack 402.

[0127] like Figure 8 As shown, in the technical solution of this embodiment, the lower surface of the cooling plate 403 is a stepped surface with a central protrusion, that is, the lower surface of the second side protrusion 4033 is located higher than the lower end surface of the cooling plate 403. In this case, the second side protrusion 4033 can only support the battery pack 402. Alternatively, a stepped surface of a corresponding shape can be provided on the bottom plate 4012, so that the lower surface of the second side protrusion 4033 and the lower end surface of the cooling plate 403 jointly form a bearing surface. In this case, the provision of the second side protrusion 4033 can also increase the contact area between the cooling plate 403 and the bottom plate 4012.

[0128] In some embodiments not shown, the lower surface of the cooling plate 403 may also be a plane, or a stepped surface with a concave center.

[0129] Optionally, a coolant channel may be provided in the second side protrusion 4033 so that the second side protrusion 4033 can also cool the bottom of the battery pack 402 , thereby enabling the cooling plate 403 to achieve a multi-faceted cooling effect on the battery pack 402 .

[0130] In this embodiment, a first side protrusion 4032 is provided on the top of the cooling plate 403, and a second side protrusion 4033 is provided on the bottom of the cooling plate 403. In some embodiments not shown, only the first side protrusion 4032 or only the second side protrusion 4033 may be provided on the top of the cooling plate 403, which is also a feasible embodiment.

[0131] The present application also provides a vehicle comprising the above-mentioned vehicle body bottom structure.

[0132] Optionally, the vehicle may be a new energy electric vehicle.

[0133] Obviously, the above embodiments are merely examples for clarity of explanation and are not intended to limit the implementation methods. Those skilled in the art will readily appreciate that other variations or modifications based on the above descriptions are possible. It is not necessary and impossible to enumerate all implementation methods here. Obvious variations or modifications arising therefrom remain within the scope of protection of the present invention.

Claims

1. A vehicle body bottom structure, characterized in that: include: Two threshold beams (10) arranged opposite to each other; A first crossbeam (20) and a second crossbeam (30) are respectively arranged at the front and rear ends of the threshold beam (10), and the two threshold beams (10), the first crossbeam (20) and the second crossbeam (30) form a mounting frame; A battery pack assembly (40) is arranged in the installation frame, the battery pack assembly (40) includes a shell (401) and a battery pack (402) and a plurality of cooling plates (403) arranged inside the shell (401), the shell (401) includes a top plate (4011), a bottom plate (4012) and a connecting edge (4013), the connecting edge (4013) is connected to the installation frame, the battery pack (402) is arranged between adjacent cooling plates (403), a coolant flow channel (4031) is provided in the cooling plate (403), the top of the cooling plate (403) is connected to the top plate (4011), the bottom of the cooling plate (403) is connected to the bottom plate (4012), and the cooling plate (403) is connected to the installation frame.

2. The vehicle body bottom structure according to claim 1, characterized in that: The battery pack assembly (40) further includes a first adapter (404), the first adapter (404) including a first connecting portion (4041) and a second connecting portion (4042), the first connecting portion (4041) passing through the top plate (4011) and being sealedly connected to the cooling plate (403), the second connecting portion (4042) being isolated from the internal space of the shell (401), and the first crossbeam (20) being connected to the second connecting portion (4042) via a first fastener.

3. The vehicle body bottom structure according to claim 1, characterized in that: The vehicle body bottom structure also includes a third cross beam (50), and the battery pack assembly (40) also includes a second adapter (405), the two ends of the third cross beam (50) are respectively connected to the two door sill beams (10), and the third cross beam (50) is located between the first cross beam (20) and the second cross beam (30), the second adapter (405) includes a third connecting portion (4051) and a fourth connecting portion (4052), the third connecting portion (4051) passes through the top plate (4011) and is sealed and connected to the cooling plate (403), the fourth connecting portion (4052) is isolated from the internal space of the shell (401), and the third cross beam (50) is connected to the fourth connecting portion (4052) through a second fastener.

4. The vehicle body bottom structure according to claim 1, characterized in that: The vehicle body bottom structure also includes a front seat front cross beam (406), a front seat rear cross beam (407), a third fastener (408) and a fourth fastener (409), wherein the front seat front cross beam (406) and the front seat rear cross beam (407) are both connected to the mounting frame, the third fastener (408) passes through the top plate (4011), and the two ends of the third fastener (408) are respectively connected to the front seat front cross beam (406) and the cooling plate (403), the fourth fastener (409) passes through the top plate (4011), and the two ends of the fourth fastener (409) are respectively connected to the front seat rear cross beam (407) and the cooling plate (403).

5. The vehicle body bottom structure according to claim 1, characterized in that: The vehicle body bottom structure further includes a sealing member (80), which is arranged between the mounting frame and the connecting edge (4013); a plurality of first connecting holes (60) are provided on the mounting frame; a plurality of second connecting holes (4014) are provided on the connecting edge (4013); the plurality of first connecting holes (60) and the plurality of second connecting holes (4014) are arranged in a one-to-one correspondence; and the vehicle body bottom structure further includes a fifth fastener (70), which passes through the first connecting holes (60) and the second connecting holes (4014) to fix the connecting edge (4013) on the mounting frame.

6. The vehicle body bottom structure according to any one of claims 1 to 5, characterized in that: The battery pack assembly (40) further includes a sixth fastener (410) and a seventh fastener (411), wherein the sixth fastener (410) is connected to the top of the cooling plate (403) and is sealed to the top plate (4011), and the seventh fastener (411) is connected to the bottom of the cooling plate (403) and is sealed to the bottom plate (4012).

7. The vehicle body bottom structure according to any one of claims 1 to 5, characterized in that: The cooling plate (403) also includes a side surface (4034), the side surface (4034) is provided with a first side convexity (4032), the first side convexity (4032) protrudes from the side surface of the cooling plate (403) and is arranged close to the top plate (4011), and / or the side surface (4034) is provided with a second side convexity (4033), the second side convexity (4033) protrudes from the side surface of the cooling plate (403) and is arranged close to the bottom plate (4012).

8. The vehicle body bottom structure according to any one of claims 1 to 5, characterized in that: The battery pack assembly (40) further includes an end plate (412) arranged at the end of the battery pack (402), and the cooling plate (403) is connected to the end plate (412) on a side facing the electrical compartment (413).

9. The vehicle body bottom structure according to any one of claims 1 to 5, characterized in that: The battery pack assembly (40) further comprises an end plate (412) arranged at the end of the battery pack (402); a side of the cooling plate (403) away from the electrical compartment (413) protrudes from the end plate (412); and a first opening (4035) and a second opening (4036) communicating with the coolant flow channel (4031) are provided on the portion of the cooling plate (403) protruding from the end plate (412).

10. A vehicle, characterized in that: The vehicle body bottom structure comprises the vehicle body bottom structure according to any one of claims 1 to 9.

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