Box body, battery pack and automobile

Abstract

The utility model provides a box body, battery pack and automobile, the box body includes bottom plate and a plurality of side portion, the plurality of side portions are connected along the circumferential direction of bottom plate in order, the side portion includes base plate and junction board, the base plate has the first side face and second side face that deviate along its thickness direction, the junction board is connected with the first side face, and the first side face is connected with the second side face. The connecting table extends in the thickness direction of the substrate and is connected with the bottom plate, the width of the substrate is W, and the distance between the end, away from the first side face, of the connecting table in the thickness direction of the substrate and the second side face is L1 and 0 lt; l1 / Wlt; in this way, due to the design of the connecting tables, on the premise that the anti-seismic and anti-torsion performance of the box body is improved, transverse obstruction to metal flowing is reduced, metal can more easily form uniform laminar flow in the width direction of the base plate, and filling defects caused by local turbulent flow are reduced.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, specifically to a housing, a battery pack, and an automobile. Background Technology

[0002] A battery pack typically consists of a housing and battery modules housed within it. To maximize the battery pack's capacity, the housing usually needs to be large enough to accommodate a large number of battery modules. In related technologies, the housing is formed by extruding multiple side panels and a bottom plate. However, when the housing size is large, the side panels need to be correspondingly large during extrusion, and the housing formed by multiple large side panels and a bottom plate suffers from reduced shock and torsional resistance. Utility Model Content

[0003] Embodiments of this utility model provide a housing, a battery pack, and an automobile, aiming to improve the shock and torsional resistance of the housing.

[0004] In one aspect, embodiments of the present invention provide a housing.

[0005] In one embodiment, the housing includes:

[0006] Base plate; and,

[0007] Multiple side portions are sequentially connected along the circumference of the base plate. Each side portion includes a base plate and a connecting platform. The base plate has a first side surface and a second side surface that are opposite to each other along its thickness direction. The connecting platform is connected to the first side surface and extends along the thickness direction of the base plate and is connected to the base plate. The width of the base plate is W. The distance between the end of the connecting platform opposite to the first side surface and the second side surface along the thickness direction of the base plate is L1, and 0 <L1 / W<1 / 4。

[0008] In one embodiment, the two ends of the substrate in the width direction and the end of the connecting platform away from the substrate are on the same circumcircle, and the diameter of the circumcircle is D, wherein 500mm≤D≤650mm.

[0009] In one embodiment, the substrate includes a first plate segment, a second plate segment, and a third plate segment sequentially connected along the thickness direction of the base plate. The thickness of the first plate segment is less than the thickness of the second plate segment, and the third plate segment is connected to the connecting platform.

[0010] In one embodiment, the housing further includes a plurality of screw connectors, and adjacent two substrates are screwed together and fixed by the plurality of screw connectors; and / or,

[0011] The two adjacent sides are welded together for fixation.

[0012] In one embodiment, the plurality of screw connectors include a first screw connector and a second screw connector, wherein the first screw connector is disposed on the first plate segment and adjacent to the second plate segment, and the second screw connector is disposed on the second plate segment and adjacent to the first screw connector.

[0013] In one embodiment, along the thickness direction of the base plate, the distance from the connection point of the first plate segment and the second plate segment to the first screw fastener is L2, wherein 25mm ≤ L2 ≤ 70mm; and / or,

[0014] Along the thickness direction of the base plate, the distance from the connection point of the first plate segment and the second plate segment to the second screw connector is L3, wherein 25mm≤L3≤70mm.

[0015] In one embodiment, the base plate is screwed and / or welded to the plurality of connecting platforms; and / or,

[0016] The base plate is screwed and / or welded to the plurality of substrates.

[0017] In one embodiment, the plurality of said sides includes two first sides arranged opposite to each other and spaced apart;

[0018] The enclosure also includes a crossbeam, which is connected to the two first sides and the bottom plate.

[0019] In one embodiment, the end of the crossbeam is provided with a plug hole;

[0020] The housing also includes a connector, which includes a plug-in platform and a connecting arm. The connecting arm has a first surface, which is disposed away from the first side of the first side portion along the thickness direction of the connecting arm. The plug-in platform is disposed on the first surface and protrudes from the first surface along the thickness direction of the connecting arm. The plug-in platform is inserted into the plug-in hole. The connecting arm is fixedly connected to the substrate of the first side portion.

[0021] In one embodiment, the connecting arm is welded to the crossbeam; and / or,

[0022] The connecting arm is screwed and fixed to the substrate.

[0023] In one embodiment, the connecting arm further has a second surface disposed away from the first surface along the thickness direction of the connecting arm, and the second surface is flush with the first side surface of the first side portion and the end face of the crossbeam.

[0024] In one embodiment, a groove is provided at one end of the crossbeam facing the first side of the first side portion. The groove communicates with the insertion hole. The groove extends through the crossbeam along the thickness direction of the base plate and is disposed on the side of the crossbeam away from the base plate. The groove has two first sidewalls disposed opposite to each other along the length direction of the substrate of the first side portion. The two first sidewalls are respectively located on both sides of the insertion hole, and both first sidewalls abut against the connecting arm.

[0025] In one embodiment, the connecting arm includes:

[0026] The connecting body has two sidewalls that are opposite to each other along the length direction of the substrate on the first side, and the width of the connecting body is smaller than the width of the groove;

[0027] Two abutment platforms are respectively connected to the two sidewalls and protrude along the width direction of the connecting body. The two abutment platforms are respectively welded and fixed to the two first sidewalls.

[0028] In one embodiment, each of the abutment platforms has a first chamfer at the end facing the first sidewall;

[0029] When the insertion platform is inserted into the insertion hole, a first receiving space is formed between the abutment platform and the first sidewall, and the first receiving space is used to receive the welding wire.

[0030] In one embodiment, the insertion platform is welded to at least one of the crossbeam and the substrate of the first side portion.

[0031] In one embodiment, the connector platform is provided with a plurality of second chamfers, all of which are oriented towards the substrate on the first side, such that the connector platform, the crossbeam, and the substrate on the first side together form a second receiving space, the second receiving space being used to receive the welding wire; and / or,

[0032] The crossbeam has a plurality of third chamfers on the side away from the insertion hole, and the plurality of third chamfers are all directed toward the substrate on the first side, so that a third receiving space is formed between the crossbeam and the substrate on the first side, and the third receiving space is used to receive the welding wire.

[0033] In one embodiment, the plurality of side portions include two second side portions, which are spaced apart and symmetrically arranged along the length direction of the base plate; and / or,

[0034] The plurality of side portions include two first side portions, which are spaced apart and symmetrically arranged along the width direction of the base plate.

[0035] In a second aspect, the present application further provides a battery pack, which includes the box body as described above.

[0036] In a third aspect, the present application further provides a vehicle, which includes the battery pack as described above.

[0037] Advantages of the embodiments of the present utility model:

[0038] In the embodiments of the present utility model, the connecting platform connects the base plate and the bottom plate. The connecting platform functions as a reinforcing rib, increasing the overall stability of the side portion in the thickness direction. The connecting platform extends along the thickness direction of the base plate and is connected to the bottom plate. This design can increase the moment of inertia of the cross-section, thereby significantly improving the bending stiffness of the side portion in the thickness direction and the overall seismic resistance of the box body. The width W of the base plate determines the main bearing area of the side portion, directly affecting its bending resistance and lateral stability. The distance L1 reflects the extension length of the connecting platform and has an important impact on the overall rigidity. It is defined that the width W of the base plate and the distance L1 between one end of the first side surface and the second side surface satisfy 0 < L1 / W < 1 / 4. When extruding a relatively large side portion, the design of the connecting platform can reduce the lateral obstruction to metal flow on the premise of meeting the requirements of improving the seismic and torsional resistance performance of the box body structure, making the metal more likely to form a uniform laminar flow along the width direction of the base plate and reducing filling defects caused by local turbulence. In addition, the design of 0 < L / W < 1 / 4 can not only reduce the extrusion pressure required for the extrusion die during extrusion molding, thereby improving the service life of the extrusion die. In addition, it can also improve the quality of the formed box body. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present utility model. For those skilled in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0040] Figure 1 is a schematic structural diagram of the box body provided by the embodiment of the present utility model;

[0041] Figure 2 is Figure 1 the partial enlarged schematic view at the position A shown;

[0042] Figure 3 is one of the schematic structural diagrams of the side portion provided by the embodiment of the present utility model;

[0043] Figure 4 is a sectional schematic view of the box body (from the first perspective) provided by the embodiment of the present utility model;

[0044] Figure 5 is Figure 4 A magnified view of part B shown;

[0045] Figure 6 This is a schematic diagram of the structure of the connector provided in an embodiment of this utility model;

[0046] Figure 7 This is a schematic diagram of the structure of the crossbeam provided in an embodiment of this utility model;

[0047] Figure 8 yes Figure 7 A magnified view of part C shown;

[0048] Figure 9 This is a cross-sectional schematic diagram (second view) of the box body provided in an embodiment of this utility model;

[0049] Figure 10 yes Figure 9 A magnified view of part D is shown below;

[0050] Figure 11 yes Figure 9 A magnified view of a portion at point E shown.

[0051] Explanation of reference numerals in the attached figures:

[0052] 10. Box body; 1. Base plate; 2. Side; 2a. First side; 2b. Second side; 21. Base plate; 211. First side; 212. Second side; 213. First plate segment; 214. Second plate segment; 215. Third plate segment; 22. Connecting platform; 3. Screw connector; 31. First screw connector; 32. Second screw connector; 4. Crossbeam; 41. Insertion hole; 42. Groove; 43. First side wall; 5. Connector; 51. Insertion platform; 52. Connecting arm; 521. First surface; 522. Second surface; 523. Connecting body; 524. Abutment platform; 71. First chamfer; 72. Second chamfer; 73. Third chamfer; 8. Opening. Detailed Implementation

[0053] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present utility model. In addition, it should be understood that the specific embodiments described herein are only for illustration and explanation of the present utility model and are not intended to limit the present utility model. In the present utility model, unless otherwise stated, directional terms such as "upper" and "lower" generally refer to the upper and lower positions of the device in actual use or operation, specifically the drawing directions in the accompanying drawings; while "inner" and "outer" refer to the outline of the device.

[0054] A battery pack typically consists of a housing and battery modules housed within it. To maximize the battery pack's capacity, the housing usually needs to be large enough to accommodate a large number of battery modules. In related technologies, the housing is formed by extruding multiple side panels and a bottom plate. However, when the housing size is large, the side panels need to be correspondingly large during extrusion, and the housing formed by multiple large side panels and a bottom plate suffers from reduced shock and torsional resistance.

[0055] In view of this, the present invention proposes a box body. Figures 1 to 11 This is a structural schematic diagram of an embodiment of the enclosure provided by this utility model. The enclosure provided by this utility model improves its shock and torsional resistance. The enclosure will be described in detail below with reference to the main accompanying drawings.

[0056] Reference Figure 1 , Figure 2 , Figure 3 and Figure 11, the box body 10 includes a bottom plate 1 and a plurality of side parts 2. The plurality of side parts 2 are sequentially connected and arranged along the circumferential direction of the bottom plate 1. The side part 2 includes a base plate 21 and a connecting platform 22. The base plate 21 has a first side surface 211 and a second side surface 212 which are arranged背离 each other along the thickness direction of the base plate 21. The connecting platform 22 is connected to the first side surface 211. The connecting platform 22 extends along the thickness direction of the base plate 21 and is connected to the bottom plate 1. The width of the base plate 21 is W, and the distance between one end of the connecting platform 22背离 the first side surface 211 and the second side surface 212 along the thickness direction of the base plate 21 is L1, and 0 < L1 / W < 1 / 4. In this way, the connecting platform 22 connects the base plate 21 and the bottom plate 1, and the connecting platform 22 functions as a reinforcing rib, increasing the overall stability of the side part 2 in the thickness direction. The connecting platform 22 extends along the thickness direction of the base plate 21 and is connected to the bottom plate 1. This design can increase the moment of inertia of the cross-section, thereby significantly improving the bending stiffness of the side part 2 in the thickness direction and the overall seismic resistance of the box body 10. The width W of the base plate 21 determines the main bearing area of the side part 2, directly affecting its bending resistance and lateral stability. The distance L1 reflects the extension length of the connecting platform 22 and has an important impact on the overall rigidity.限定 the width W of the base plate 21 and the distance L1 between one end of the first side surface 211 and the second side surface 212 to satisfy 0 < L1 / W < 1 / 4, so that when extruding a larger side part 2, the design of the connecting platform 22 can reduce the lateral resistance to metal flow on the premise of meeting the requirements of improving the seismic and torsional resistance performance of the structure of the box body 10, making the metal more likely to form a uniform laminar flow along the width direction of the base plate 21 and reducing the filling defects caused by local turbulence. In addition, the design of 0 < L / W < 1 / 4 can not only reduce the extrusion force required for the extrusion die during extrusion molding, thereby improving the service life of the extrusion die. In addition, it can also improve the quality of the formed box body 10.

[0057] It should be noted that the value of L / W can be selected according to needs. For example, the value of L / W can be 0.1, 0.12, 0.15, 0.18, 0.2, 0.22 or 0.25, etc. Specifically, this application does not limit this. When L1 / W > 1 / 4, it will lead to an increase in the lateral resistance to metal flow, which is not convenient for extrusion molding.

[0058] In an embodiment, the bottom plate 1 and the connecting platform 22 overlap each other. In this way, the contact area between the side part 2 and the bottom plate 1 is increased, so that when the side part 2 and the bottom plate 1 are connected and fixed, it helps to disperse stress, reduce local stress concentration, and enables the connection between the side part 2 and the bottom plate 1 to withstand a large load without failure. The larger contact area helps to absorb and disperse vibration and impact energy, thereby improving the seismic and torsional resistance performance of the structure of the box body 10.

[0059] Refer to Figure 3In one embodiment, the two ends of the substrate 21 in the width direction and the end of the connecting platform 22 opposite to the substrate 21 are on the same circumscribed circle. This helps to disperse stress, reduce local stress concentration, and improve the structural stability of the side portion 2. The diameter of the circumscribed circle is D, where 500mm ≤ D ≤ 650mm. This allows for easier control of the side portion molding process while meeting production requirements, reducing molding difficulty. Furthermore, a diameter between 500mm and 650mm ensures sufficient space within the housing to install the battery module, thereby increasing the capacity of the battery pack with this housing.

[0060] It should be noted that the diameter of the circumscribed circle can be selected as needed. For example, the diameter of the circumscribed circle can be 500mm, 530mm, 550mm, 580mm, 600mm, 620mm, or 650mm, etc. Specifically, this application does not limit this. Furthermore, when the diameter of the circumscribed circle is less than 500mm, the capacity of the enclosure is small and cannot meet the user's needs. When the diameter of the circumscribed circle is greater than 650mm, it will lead to difficulties in the side manufacturing process.

[0061] Reference Figure 1 In one embodiment, the plurality of side portions 2 include two second side portions 2b, which are spaced apart and symmetrically arranged along the length of the base plate 1. This makes the two second side portions 2b structurally identical, facilitating the processing of both second side portions 2b using a single mold, thus saving costs. Furthermore, the symmetrical arrangement of the two second side portions 2b can create a force couple balance, uniformly transmitting the load to the base plate 1 through the two second side portions 2b, preventing overloading of any single side portion 2. The symmetrical arrangement of the two second side portions 2b also allows for the even distribution of torque under stress, reducing localized stress concentration and thereby improving the torsional resistance of the housing 10 structure.

[0062] Reference Figure 1 In one embodiment, the plurality of side portions 2 include two first side portions 2a, which are spaced apart and symmetrically arranged along the width direction of the base plate 1. This makes the two first side portions 2a structurally identical, facilitating the processing of both first side portions 2a using a single mold, thus saving costs. Furthermore, the symmetrical arrangement of the two first side portions 2a can create a force couple balance, uniformly transmitting the load to the base plate 1 through the two first side portions 2a, preventing overloading of any single side portion 2. The symmetrical arrangement of the two first side portions 2a can evenly distribute the torque under stress, reducing local stress concentration and thereby improving the torsional resistance of the housing 10 structure.

[0063] Reference Figure 3In one embodiment, the substrate 21 includes a first plate segment 213, a second plate segment 214, and a third plate segment 215 sequentially connected along the thickness direction of the base plate 1. The thickness of the first plate segment 213 is less than the thickness of the second plate segment 214, and the third plate segment 215 is connected to the connecting platform 22. In this way, while ensuring the structural strength of the substrate 21, material is saved, and production costs and the weight of the housing 10 are reduced. In addition, since the second plate segment 214 is thicker, the rigidity of the substrate 21 is increased, which can reduce the deformation of the housing 10.

[0064] Reference Figure 1 In one embodiment, the housing 10 further includes a plurality of screw connectors 3, which are used to screw and fix adjacent substrates 21 together. This design of the screw connectors 3 increases the rigidity of the housing 10, reduces deformation, and improves structural stability. This design allows the housing 10 to distribute load more evenly under stress, thereby reducing the risk of failure. The screw connectors 3 provide a detachable connection, facilitating the maintenance and repair of the housing 10. This design makes it easier to disassemble and reinstall the screw connectors 3 when maintenance or component replacement is required. The design of the screw connectors 3 increases the load-bearing capacity of the housing 10, enabling the overall structure of the housing 10 to withstand greater loads.

[0065] Reference Figure 1 In one embodiment, the plurality of screw connectors 3 include a first screw connector 31 and a second screw connector 32. The first screw connector 31 is disposed on the first plate segment 213 and adjacent to the second plate segment 214, and the second screw connector 32 is disposed on the second plate segment 214 and adjacent to the first screw connector 31. Thus, since there is a sudden change in cross-section at the connection between the first plate segment 213 and the second plate segment 214, the first screw connector 31 and the second screw connector 32 ensure that the stress on the side portion 2 is evenly distributed through them when under load, preventing stress concentration that could lead to damage to the side portion 2. Furthermore, the placement of the first screw connector 31 and the second screw connector 32 increases the structural rigidity of the housing 10, reduces deformation of the housing 10, and improves the structural stability and service life of the housing 10.

[0066] It should be noted that multiple first screw connectors 31 can be provided, and these multiple first screw connectors 31 are spaced apart along the length direction of the substrate 21. This ensures a firm connection between adjacent side portions 2, and allows stress on side portions 2 to be evenly distributed through the multiple first screw connectors 31 when under load, preventing stress concentration that could lead to damage to side portions 2. Similarly, multiple second screw connectors 32 can be provided, and these multiple second screw connectors 32 are spaced apart along the length direction of the substrate 21. This also ensures a firm connection between adjacent side portions 2, and allows stress on side portions 2 to be evenly distributed through the multiple second screw connectors 32 when under load, preventing stress concentration that could lead to damage to side portions 2.

[0067] In one embodiment, the distance from the first screw connector 31 to the connection point of the first plate segment 213 and the second plate segment 214 is L2, wherein 25mm≤L2≤70mm. This ensures the connection strength of the first screw connector 31 and facilitates the assembly and disassembly of the first screw connector 31.

[0068] It should be noted that when L2 is greater than 70mm, the first screw connector 31 will not be able to effectively reinforce the connection between the first plate segment 213 and the second plate segment 214, making this area prone to cracking due to external forces. When L2 is less than 25mm, the installation of the first screw connector 31 will be difficult. Specifically, the value of L2 can be selected as needed, for example, L2 can be 25mm, 30mm, 35mm, 40mm, 45mm, 50mm, 55mm, 60mm, 65mm, or 70mm, etc. Specifically, this application does not limit this.

[0069] The distance from the second screw connector 32 to the connection point of the first plate segment 213 and the second plate segment 214 is L3, where 25mm≤L3≤70mm. This ensures the connection strength of the second screw connector 32 while facilitating its assembly and disassembly.

[0070] It should be noted that when L3 is greater than 70mm, the second screw connector 32 will not be able to effectively reinforce the connection between the first plate segment 213 and the second plate segment 214, making this area prone to cracking due to external forces. When L3 is less than 25mm, the installation of the second screw connector 32 will be difficult. Specifically, the value of L3 can be selected as needed, for example, L3 can be 25mm, 30mm, 35mm, 40mm, 45mm, 50mm, 55mm, 60mm, 65mm, or 70mm, etc. Specifically, this application does not limit this.

[0071] Reference Figure 1 In one embodiment, adjacent side portions 2 are welded together. This welding increases the rigidity of the housing 10 structure, reduces deformation, and improves the structural stability of the housing 10. Welding also increases the load-bearing capacity of the structure, allowing the overall structure of the housing 10 to withstand greater loads. Furthermore, welding improves the sealing performance of the housing 10.

[0072] It should be noted that there are multiple ways to weld and fix adjacent two side portions 2. For example, in one embodiment, adjacent two substrates 21 can be welded and fixed. In another embodiment, adjacent two connecting platforms 22 can be welded and fixed. In yet another embodiment, adjacent two substrates 21 and adjacent two connecting platforms 22 can also be welded and fixed. Specifically, this application does not limit this.

[0073] In one embodiment, the base plate 1 is screwed and / or welded to a plurality of connecting platforms 22. This screwing and / or welding may increase the structural rigidity of the housing 10, reduce its deformation, and improve the structural stability of the housing 10. The design of multiple connecting platforms 22 may increase the load-bearing capacity of the housing 10, enabling the overall structure of the housing 10 to withstand greater loads.

[0074] It should be noted that the specific connection method between the base plate 1 and the multiple connecting platforms 22 can be selected as needed, and this application does not limit it. Moreover, when the base plate 1 and the multiple connecting platforms 22 are screwed and welded together, the connection between the base plate 1 and the multiple connecting platforms 22 is the most secure.

[0075] In one embodiment, the base plate 1 is screwed and / or welded to a plurality of base plates 21. In this way, screwing and / or welding can increase the rigidity of the housing 10, reduce the deformation of the housing 10, and improve the structural stability of the housing 10.

[0076] It should be noted that the connection method between the base plate 1 and the multiple substrates 21 can be selected as needed, and this application does not limit it. Moreover, the connection between the base plate 1 and the multiple substrates 21 is most secure when the base plate 1 is screwed and welded to the substrates 21.

[0077] In one embodiment, the plurality of side portions 2 include two first side portions 2a arranged opposite to each other and spaced apart. The housing 10 also includes a crossbeam 4, which is connected to the two first side portions 2a and the bottom plate 1. This increases the structural rigidity of the housing 10, reduces the deformation of the housing 10, and improves the structural stability of the housing 10. The design of the crossbeam 4 increases the load-bearing capacity of the housing 10, enabling the housing 10 to withstand greater loads.

[0078] Reference Figure 1 In one embodiment, the substrate has a symmetrical plane extending along its width. An opening 8 is provided at the end of the substrate 21 away from the connecting platform 22, allowing the frame to pass through. The opening 8 is symmetrically arranged about the symmetrical plane, as are the crossbeam 4 and the base plate 1. Thus, the symmetrical plane of the substrate 21 divides the housing 10 into two mirror-symmetrical parts, ensuring that external loads (such as bending moments or torques transmitted by the frame) are evenly distributed along the symmetrical plane, avoiding stress concentration on one side. When the frame passes through the opening 8, the support stiffness on both sides of the symmetrical plane is consistent, avoiding dynamic response differences caused by asymmetrical stiffness and reducing the risk of resonance. The symmetrical arrangement of the opening 8 about the symmetrical plane ensures that the load transmission path is centered after the frame is installed, avoiding additional bending moments caused by eccentric loads. Furthermore, the symmetrical arrangement of the opening 8, base plate 1, and crossbeam 4 about the symmetrical plane ensures consistent internal space within the housing 10, allowing for modular interchangeability and simplifying the design.

[0079] Reference Figure 2 , Figure 4 and Figure 6 In one embodiment, the end of the crossbeam 4 is provided with a insertion hole 41. The housing 10 also includes a connector 5, which includes an insertion platform 51 and a connecting arm 52. The connecting arm 52 has a first surface 521, which is disposed away from the first side surface 211 of the first side portion 2a along the thickness direction of the connecting arm 52. The insertion platform 51 is disposed on the first surface 521 and protrudes from the first surface 521 along the thickness direction of the connecting arm 52. The insertion platform 51 is inserted into the insertion hole 41. In this way, the insertion engagement between the insertion platform 51 and the insertion hole 41 can form a "mechanical lock", suppressing the displacement of the crossbeam 4 along its length direction. The connecting arm 52 is fixedly connected to the base plate 21 of the first side portion 2a. In this way, the longitudinal constraint on the crossbeam 4 is enhanced, and the bending and torsional resistance of the crossbeam 4 is improved. In addition, the insertion and mating of the insertion platform 51 and the insertion hole 41 increases the rigidity of the box 10 structure, reduces the deformation of the box 10, and improves the stability and load-bearing capacity of the box 10.

[0080] It should be noted that both ends of the crossbeam 4 are provided with insertion holes 41, and two connectors 5 are provided. The two ends of the crossbeam 4 are fixedly connected to the base plates 21 of the two oppositely arranged first side portions 2a through the two connectors 5. In this way, the crossbeam 4 and the two first side portions 2a form a stable frame structure. This design can effectively enhance the overall rigidity of the entire housing 10 and prevent loosening or deformation caused by external impact or vibration. The design of the insertion holes 41, together with the fixing method of the connectors 5, can evenly distribute the force on the crossbeam 4 and the base plate 21, avoiding local stress concentration. The combined use of the insertion holes 41 and the connectors 5 can ensure the precise positioning between the crossbeam 4 and the base plate 21, reduce assembly errors, and improve assembly efficiency.

[0081] Reference Figure 5 In one embodiment, the connecting arm 52 is welded to the crossbeam 4. This welded metallurgical bond makes the strength of the connection point nearly equal to or even equal to that of the connecting arm 52 and the crossbeam 4, effectively transferring loads. When subjected to dynamic forces (such as vibration or impact), the weld between the connecting arm 52 and the crossbeam 4 is less prone to loosening, making the overall structure of the housing 10 more stable and reliable. Furthermore, after welding, the connecting arm 52 and the crossbeam 4 form an integrated structure, significantly improving the overall rigidity of the housing 10 and reducing deformation caused by external forces. Additionally, the elimination of additional connecting parts 5 such as bolts and rivets makes the structure of the housing 10 more compact, avoiding the occupation of internal space. It also reduces the number of parts and the overall weight of the housing 10. Moreover, the welding process allows for rapid connection, reducing assembly steps and lowering labor and parts procurement costs. The weld provides a good sealing effect.

[0082] In one embodiment, the connecting arm 52 is screwed to the substrate 21. This screwing provides a strong mechanical connection force, ensuring a stable and reliable connection between the connecting arm 52 and the substrate 21. The screwing point can evenly distribute the force, avoiding structural damage caused by localized stress concentration at the connection between the connecting arm 52 and the substrate 21, further enhancing the structural stability and impact resistance of the housing 10.

[0083] It should be noted that the method of fixing the connecting arm 52 to the substrate 21 can be selected as needed. For example, the connecting arm 52 and the substrate 21 can also be fixed by welding or by snap-fit ​​structure. Specifically, this application does not limit this.

[0084] Reference Figure 5 and Figure 6 In one embodiment, the connecting arm 52 further has a second surface 522, which is disposed away from the first surface 521 along the thickness direction of the connecting arm 52. The second surface 522 is flush with the end face of the first side 211 crossbeam 4 of the first side portion 2a. This design not only improves the overall aesthetic consistency but also enhances structural stability. The flush design of the second surface 522, the first side 211, and the end face of the crossbeam 4 reduces stress concentration points caused by irregular shapes or protrusions, helping to disperse external loads and reduce the risk of localized damage. The flush design of the second surface 522, the first side 211, and the end face of the crossbeam 4 allows for a tighter fit between components, avoiding space waste caused by uneven surfaces. This helps to maximize the use of the limited internal space of the housing and increase the energy density of the battery pack.

[0085] Reference Figure 2 , Figure 6 , Figure 7 and Figure 8In one embodiment, a groove 42 is provided at one end of the crossbeam 4 facing the first side surface 211 of the first side portion 2a. The groove 42 communicates with the insertion hole 41. The groove 42 is provided through the crossbeam 4 on the side away from the base plate 1 along the thickness direction of the base plate 1. The groove 42 has two first sidewalls 43 arranged opposite each other along the length direction of the base plate 21 of the first side portion 2a. The two first sidewalls 43 are respectively located on both sides of the insertion hole 41, and both first sidewalls 43 abut against the connecting arm 52. In this way, the two first sidewalls 43 are symmetrically distributed on both sides of the insertion hole 41, providing a clear installation reference for the connecting arm 52. Through the physical blocking of the first sidewalls 43, it can be ensured that the insertion platform 51 is inserted into the insertion hole 41 in a preset direction, avoiding offset or angular tilt during assembly. The abutment between the first sidewalls 43 and the connecting arm 52 forms a physical limit, directly resisting displacement along the length direction of the base plate 21, and preventing the connecting arm 52 from swaying left and right due to external loads (such as vibration, impact or lateral force). The load transmitted by the connecting arm 52 is evenly distributed through the contact surface between the first sidewall 43 and the crossbeam 4, avoiding excessive stress concentration at the edge of the insertion hole 41 and reducing the risk of cracking around the hole. The symmetrical contact of the two first sidewalls 43 can jointly resist the torque, preventing the connecting arm 52 from rotating or deflecting due to torsional torque, and improving the torsional stiffness of the structure.

[0086] Reference Figure 2 , Figure 5 and Figure 6 In one embodiment, the connecting arm 52 includes a connecting body 523 and two abutment platforms 524. The connecting body 523 has two sidewalls facing away from each other along the length direction of the base plate 21 of the first side portion 2a, and the width of the connecting body 523 is smaller than the width of the groove 42. The two abutment platforms 524 are respectively connected to the two sidewalls and protrude along the width direction of the connecting body 523. The two abutment platforms 524 are respectively welded and fixed to the two first sidewalls 43. In this way, the two sidewalls of the connecting body 523 and the two abutment platforms 524 form symmetrical force transmission channels, which can distribute the load from the connecting arm 52 to the first sidewalls 43 of the crossbeam 4, avoiding stress concentration caused by unilateral force. The welding and fixing of the two abutment platforms 524 to the two first sidewalls 43 forms a double connection point. Even if the weld on one side fails, the structural integrity of the other side can still be maintained, significantly improving the overload resistance of the housing 10. The welding of the two abutment platforms 524 to the two first sidewalls 43 can effectively resist the torsional moment of the connecting arm 52. In addition, this design enhances the bending resistance of the connecting arm 52. The symmetrical welding design of the two abutment platforms 524 to the two first sidewalls 43 can automatically compensate for small displacements under thermal expansion or external force, reducing the sensitivity to assembly tolerances.

[0087] It should be noted that an adhesive bonding process can be added to the welding process, using structural adhesive to fill the microscopic gap between the abutment platform 524 and the first sidewall 43, thus combining rigid connection and damping vibration reduction characteristics. Heat dissipation channels or phase change materials (such as paraffin wax) can also be pre-embedded inside the abutment platform 524 for heat dissipation during the welding process or for releasing temperature stress during subsequent use.

[0088] Reference Figure 2 and Figure 6 In one embodiment, each abutment 524 has a first chamfer 71 at one end facing the first sidewall 43. When the insertion platform 51 is inserted into the insertion hole 41, a first receiving space is formed between the abutment 524 and the first sidewall 43 to accommodate the welding wire. Thus, the first receiving space formed by the first chamfer 71 provides a pre-fixed position for the welding wire, ensuring that the molten metal fills along a predetermined path during welding, avoiding uneven weld or incomplete fusion defects caused by welding wire deviation. The first receiving space restricts the flow range of the welding wire, forcing the molten pool to penetrate towards the abutment 524 and the first sidewall 43, increasing the effective penetration depth, forming a weld cross-section with a better width-to-thickness ratio, and improving the static load and fatigue strength of the housing 10. The bevel of the first chamfer 71 guides the alignment of the abutment 524 and the first sidewall 43 during insertion, reducing assembly resistance. The first receiving space allows for a controllable assembly gap between the abutment 524 and the first sidewall 43, compensating for processing or installation errors through welding wire filling, reducing stringent requirements on component dimensional accuracy. The chamfered transition reduces the sharp edges at the end of the abutment platform 524, avoiding stress concentration. After the weld metal fills the first receiving space, a continuous material transition zone is formed, reducing the stress gradient at the joint and delaying crack initiation. After welding, the weld metal in the receiving space, the abutment platform 524, and the first sidewall 43 form a "wedge-shaped interlocking" structure, which can effectively resist interface peeling under impact loads and improve the connection reliability under dynamic working conditions. Through the chamfer design, gravity and capillary action can be used to allow the molten pool to penetrate to the back side when welding on one side, achieving a double-sided welding effect, reducing the number of workpiece flipping times, and improving production efficiency. If local defects occur in the weld, the first receiving space can be used as a process groove for grinding and repair welding, avoiding damage to the abutment platform 524 and the first sidewall 43, and simplifying the rework process.

[0089] Reference Figure 9 and Figure 10 In one embodiment, the insertion platform 51 is welded to at least one of the crossbeam 4 and the substrate 21 of the first side portion 2a. This allows the insertion platform 51 to form a rigid connection with at least one of the crossbeam 4 and the substrate 21 of the first side portion 2a, ensuring efficient load transfer through the weld points and improving the overall load-bearing capacity of the housing 10. Welding also integrates the insertion platform 51 with at least one of the crossbeam 4 and the substrate 21 of the first side portion 2a, reducing the risk of loosening due to vibration.

[0090] It should be noted that the connection between the insertion platform 51 and the crossbeam 4 and the base plate 21 of the first side portion 2a is most secure when both are welded and fixed. Of course, in other embodiments, the insertion platform 51 can also be welded and fixed to the crossbeam 4. In yet another embodiment, the insertion platform 51 can also be welded and fixed to the base plate 21 of the first side portion 2a. Specifically, this application does not limit this to any particular embodiment.

[0091] Reference Figure 6 In one embodiment, the insertion platform 51 is provided with a plurality of second chamfers 72, all of which face the substrate 21 of the first side 2a, so that the insertion platform 51, the crossbeam 4, and the substrate 21 of the first side 2a together form a second receiving space for accommodating the welding wire. Thus, the beveled surface of the second chamfer 72 guides the molten metal to flow towards the junction of the substrate 21 and the crossbeam 4, reducing welding dead angles and avoiding defects such as incomplete fusion or slag inclusions, resulting in a more uniform weld formation between the insertion platform 51, the crossbeam 4, and the substrate 21 of the first side 2a. The second chamfer 72 transforms the right-angle connection between the insertion platform 51 and the substrate 21 into a gradual transition, reducing the stress concentration factor. The second receiving space allows the molten metal to automatically fill during welding, accommodating the thermal expansion differences among the insertion platform 51, the crossbeam 4, and the first side 2a.

[0092] Reference Figure 7 and Figure 8 In one embodiment, the side of the crossbeam 4 away from the insertion hole is provided with multiple third chamfers 73, all of which are oriented towards the substrate 21 of the first side 2a, so that a third receiving space is formed between the crossbeam 4 and the substrate 21 of the first side 2a. The third receiving space is used to receive the welding wire. In this way, the third receiving space provides a stable filling position for the welding wire, ensuring that the molten metal is evenly distributed along the interface between the crossbeam 4 and the substrate 21. The chamfered surface guides the molten pool to the critical connection interface, enhances the fusion depth, and reduces the risk of incomplete fusion or slag inclusions. The third chamfer 73 transforms the right-angle connection between the crossbeam 4 and the substrate 21 into a gradual transition, thereby reducing the stress concentration factor.

[0093] Secondly, this application also provides a battery pack, which includes a housing 10 as described above. The specific structure of the housing 10 is as described in the above embodiments. Since this battery pack adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.

[0094] Thirdly, the embodiments of this utility model also propose an automobile, which includes the battery pack described above. The specific structure of the battery pack is as described in the above embodiments. Since this automobile adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be repeated here.

[0095] The embodiments of this utility model have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this utility model. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this utility model. Therefore, the content of this specification should not be construed as a limitation of this utility model.

Claims

1. A case characterized by comprising: include: Base plate; as well as, Multiple side portions are sequentially connected along the circumference of the base plate. Each side portion includes a base plate and a connecting platform. The base plate has a first side surface and a second side surface that are opposite to each other along its thickness direction. The connecting platform is connected to the first side surface and extends along the thickness direction of the base plate and is connected to the base plate. The width of the base plate is W. The distance between the end of the connecting platform opposite to the first side surface and the second side surface along the thickness direction of the base plate is L1, and 0 <L1 / W<1 / 4。 2. The case of claim 1, wherein, The two ends of the substrate in the width direction and the end of the connecting platform away from the substrate are on the same circumscribed circle, the diameter of which is D, where 500mm≤D≤650mm.

3. The case of claim 1, wherein, The substrate includes a first plate segment, a second plate segment, and a third plate segment connected sequentially along the thickness direction of the base plate. The thickness of the first plate segment is less than the thickness of the second plate segment, and the third plate segment is connected to the connecting platform.

4. The case of claim 3, wherein, The housing also includes multiple screw connectors, and adjacent substrates are screwed together and fixed by the multiple screw connectors; and / or The two adjacent sides are welded together for fixation.

5. The case of claim 4, wherein, The plurality of screw connectors include a first screw connector and a second screw connector, wherein the first screw connector is disposed on the first plate segment and adjacent to the second plate segment, and the second screw connector is disposed on the second plate segment and adjacent to the first screw connector.

6. The case of claim 5, wherein, Along the thickness direction of the base plate, the distance from the connection point of the first plate segment and the second plate segment to the first screw fastener is L2, wherein 25mm≤L2≤70mm; and / or, Along the thickness direction of the base plate, the distance from the connection point of the first plate segment and the second plate segment to the second screw connector is L3, wherein 25mm≤L3≤70mm.

7. The case according to any one of claims 1 to 6, characterized in that The base plate is screwed and / or welded to the plurality of connecting platforms; and / or The base plate is screwed and / or welded to the plurality of substrates.

8. The case according to any one of claims 1 to 6, characterized in that The plurality of said sides include two first sides arranged opposite to each other and spaced apart; The enclosure also includes a crossbeam, which is connected to the two first sides and the bottom plate.

9. The case of claim 8, wherein, The ends of the crossbeam are provided with insertion holes; The housing also includes a connector, which includes a plug-in platform and a connecting arm. The connecting arm has a first surface, which is disposed away from the first side of the first side portion along the thickness direction of the connecting arm. The plug-in platform is disposed on the first surface and protrudes from the first surface along the thickness direction of the connecting arm. The plug-in platform is inserted into the plug-in hole. The connecting arm is fixedly connected to the substrate of the first side portion.

10. The case of claim 9, wherein, The connecting arm is welded and fixed to the crossbeam; and / or, The connecting arm is screwed and fixed to the substrate.

11. The case of claim 9, wherein, The connecting arm also has a second surface, which is disposed away from the first surface along the thickness direction of the connecting arm, and the second surface is flush with the first side surface of the first side portion and the end face of the crossbeam.

12. The case of claim 9, wherein, A groove is provided at one end of the crossbeam facing the first side of the first side portion. The groove communicates with the insertion hole. The groove extends through the crossbeam along the thickness direction of the base plate and is provided on the side away from the base plate. The groove has two first sidewalls arranged opposite each other along the length direction of the base plate of the first side portion. The two first sidewalls are respectively located on both sides of the insertion hole, and both first sidewalls abut against the connecting arm.

13. The case of claim 12, wherein, The connecting arm includes: The connecting body has two sidewalls that are opposite to each other along the length direction of the substrate on the first side, and the width of the connecting body is smaller than the width of the groove; Two abutment platforms are respectively connected to the two sidewalls and protrude along the width direction of the connecting body. The two abutment platforms are respectively welded and fixed to the two first sidewalls.

14. The case of claim 13, wherein, Each of the abutment platforms has a first chamfer at one end facing the first sidewall; When the insertion platform is inserted into the insertion hole, a first receiving space is formed between the abutment platform and the first sidewall, and the first receiving space is used to receive the welding wire.

15. The case of claim 9, wherein, The insertion platform is welded and fixed to at least one of the crossbeam and the substrate of the first side.

16. The case of claim 15, wherein, The plug-in platform is provided with a plurality of second chamfers, all of which are directed toward the substrate on the first side, so that the plug-in platform, the crossbeam and the substrate on the first side together form a second accommodating space, which is used to accommodate the welding wire. And / or, The crossbeam has a plurality of third chamfers on the side away from the insertion hole, and the plurality of third chamfers are all directed toward the substrate on the first side, so that a third receiving space is formed between the crossbeam and the substrate on the first side, and the third receiving space is used to receive the welding wire.

17. The case of any one of claims 1 to 6, wherein, The plurality of said sides include two second sides, which are spaced apart and symmetrically arranged along the length of the base plate; and / or, The plurality of side portions include two first side portions, which are spaced apart and symmetrically arranged along the width direction of the base plate.

18. A battery pack, characterized by Includes the enclosure as described in any one of claims 1 to 17.

19. An automobile characterized by comprising: Includes the battery pack as described in claim 18.

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