Box body edge beam reinforcing structure, battery box, battery pack and electric equipment

Abstract

The utility model belongs to the technical field of batteries, and discloses a box body edge beam reinforcing structure, a battery box, a battery pack and electric equipment, which comprises an edge beam, the length of the edge beam extends along the x direction, the thickness of the edge beam extends along the y direction perpendicular to the x direction, and the edge beam is provided with at least one cavity with the length extending along the x direction, and is characterized by further comprising a reinforcing plate, the reinforcing plate is installed in a cavity of the edge beam, and a plurality of buffering holes penetrating through the reinforcing plate in the y direction are formed in the reinforcing plate at intervals. According to the utility model, the reinforcing plate provided with the buffer hole is arranged in one cavity of the edge beam, and the reinforcing plate can increase the structural strength of the edge beam and improve the buffer effect of the edge beam. When an automobile is subjected to side impact, impact force is buffered and transmitted to the edge beam through the reinforcing plate, so that the impact force transmitted to a battery in the battery pack by the edge beam is greatly reduced, and the safety problem occurring in the impact process of the battery pack is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a side beam strengthening structure of a box body, a battery box, a battery pack and an electric device. Background Art

[0002] With the rapid development of the new energy battery industry, the safety requirements for batteries are getting higher and higher. During the long-term use of the battery pack of an electric vehicle, the physical strength and anti-collision impact strength of the battery pack are becoming more and more important. The physical strength and anti-collision impact strength of the battery pack are mainly ensured by the outer side beam of the battery box, so the strength of the side beam of the battery pack is particularly important.

[0003] In the existing conventional power battery packs, the side beams are usually designed as L-shaped or day-shaped. However, there are no components for buffering impact in the cavities of the side beams. When the vehicle is impacted, the impact force generated directly passes through the side beam to the inside of the battery, and it is very easy to cause a short circuit inside the battery, and even cause the battery to catch fire and explode. Summary of the Utility Model

[0004] The purpose of the embodiments of the utility model is to provide a side beam strengthening structure of a box body, a battery box, a battery pack and an electric device, which has high strength and has a good buffering effect on impact force.

[0005] To achieve the above purpose, the utility model adopts the following technical solutions:

[0006] On the one hand, a side beam strengthening structure of a box body is provided, including a side beam and a reinforcing plate.

[0007] Wherein, the length of the side beam extends along the x direction, the thickness of the side beam extends along the y direction perpendicular to the x direction, and the side beam has at least one cavity with a length extending along the x direction. The reinforcing plate is installed in one cavity of the side beam, and a plurality of buffer holes penetrating the reinforcing plate along the y direction are spaced apart on the reinforcing plate.

[0008] As a further solution of the side beam strengthening structure of the box body, the cross section of the side beam has at least three cavities along the z direction, and the reinforcing plate is installed in the cavity adjacent to or located at the central position of the side beam along the z direction, and the z direction is perpendicular to the x direction and the y direction.

[0009] As a further solution of the side beam strengthening structure of the box body, the reinforcing plate is a cuboid plate-like structure, the cross section of the corresponding cavity is a rectangular structure, one side of the reinforcing plate along its thickness direction is adjacent to the inner plate of the side beam, and the other side of the reinforcing plate along its thickness direction is adjacent to the outer plate of the side beam, and all the buffer holes penetrate along the thickness direction of the reinforcing plate.

[0010] As a further solution for the reinforcement structure of the box body side beam, all the buffer holes are evenly distributed along the length direction of the reinforcement plate.

[0011] As a further solution for the reinforcement structure of the box body side beam, the reinforcement plate is in clearance fit with the cavity, and the reinforcement plate is fixedly connected to the cavity through foaming glue.

[0012] As a further solution for the reinforcement structure of the box body side beam, the buffer holes are in the shape of hexagon, triangle, rectangle, circle or ellipse.

[0013] As a further solution for the reinforcement structure of the box body side beam, the reinforcement plate is a continuous glass fiber reinforced thermoplastic composite plate.

[0014] As a further solution for the reinforcement structure of the box body side beam, it further includes a mounting beam fixed on the side beam. The mounting beam includes a first mounting member, a second mounting member and a third mounting member. The first mounting member includes a first mounting plate and a first connecting plate connected to each other. The second mounting member includes a second mounting plate and a second connecting plate connected to each other. The third mounting member is located between the first mounting member and the second mounting member, and the third mounting member includes a third mounting plate and a third connecting plate connected to each other. The first mounting plate, the second mounting plate and the third mounting plate are fixedly connected through a connecting member. One end of the first connecting plate far from the first mounting plate, one end of the second connecting plate far from the third mounting plate and one end of the third connecting plate far from the third mounting plate are respectively welded to the side beam.

[0015] As a further solution for the reinforcement structure of the box body side beam, the first mounting plate has a horizontally arranged first mounting plate body and a plurality of first convex portions that are convex on the surface of the first mounting plate body through rolling. The length of the first mounting plate body extends along the x direction to the vicinity of both ends of the side beam, and the plurality of first convex portions are evenly spaced along the x direction;

[0016] The second mounting plate has a horizontally arranged second mounting plate body and a plurality of first concave portions that are concave on the surface of the second mounting plate body through rolling. The length of the second mounting plate body extends along the x direction to the vicinity of both ends of the side beam, and the plurality of first concave portions are evenly spaced along the x direction;

[0017] The third mounting plate has a horizontally arranged third mounting plate body and a plurality of second concave portions that are concave on the surface of the third mounting plate body through rolling. The length of the third mounting plate body extends along the x direction to the vicinity of both ends of the side beam, and the plurality of second concave portions are evenly spaced along the x direction;

[0018] The first mounting plate body, the second mounting plate body, and the third mounting plate body are closely attached to each other. The first concave portion and the second concave portion are in one-to-one correspondence and are closely attached and face the first convex portion. The first convex portion, the first concave portion, and the second concave portion are fixedly connected by the connecting member.

[0019] On the other hand, a battery box is provided. The box body includes a bottom guard plate and four side beam structures. The four side beam structures are located on the same side of the bottom guard plate and are fixedly connected to the four sides of the bottom guard plate. The two ends of each side beam structure are respectively fixedly connected to the ends of an adjacent side beam structure. Among the four side beam structures, at least two relatively side beam structures are the box body side beam strengthening structures as described above.

[0020] On another aspect, a battery pack is provided, which includes a battery and also includes the battery box as described above. The battery is installed in the battery box.

[0021] On yet another aspect, an electrical device is further provided, which includes a device body and also includes the battery pack as described above. The outer side of the side beam of the box body side beam strengthening structure of the battery pack of the battery pack is installed on the device body through a mounting beam.

[0022] Beneficial effects:

[0023] In the present utility model, a reinforcing plate provided with buffer holes is installed in a cavity of the side beam. The reinforcing plate can increase the structural strength of the side beam and improve the buffering effect of the side beam. When the vehicle is impacted from the side, the impact force is buffered by the reinforcing plate and transmitted to the inside of the box body, so that the impact force transmitted from the side beam to the battery in the battery pack is greatly reduced, and the safety problems occurring during the impact of the battery pack are reduced.

[0024] In the present utility model, a third mounting member is provided between the first mounting member and the second mounting member, and the lengths of the first mounting member, the second mounting member, and the third mounting member are respectively extended to the two ends in the length direction of the side beam close to the welded side beam. After the first mounting plate, the second mounting plate, and the third mounting plate are respectively welded and fixed to the side beam, the compressive strength of the box body side beam strengthening structure can be effectively improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The present utility model will be further described in detail below with reference to the drawings and embodiments.

[0026] Figure 1 It is a schematic structural diagram of the box body side beam strengthening structure (part of the reinforcing plate is inserted into the cavity, not including the mounting beam) according to the embodiment of the present utility model.

[0027] Figure 2 It is a schematic structural diagram of the side beam according to the embodiment of the present utility model.

[0028] Figure 3 This is a schematic structural diagram of the mounting beam according to an embodiment of the present utility model.

[0029] Figure 4 This is a schematic structural diagram of the first mounting member according to an embodiment of the present utility model.

[0030] Figure 5 This is a schematic structural diagram of the second mounting member according to an embodiment of the present utility model.

[0031] Figure 6 This is a schematic structural diagram of the third mounting member according to an embodiment of the present utility model.

[0032] Figure 7 This is a top view schematic diagram of the battery box according to an embodiment of the present utility model.

[0033] In the figure:

[0034] 1, box body; 11, bottom protection plate; 12, side beam structure;

[0035] 100, side beam; 101, first horizontal part; 102, first vertical part; 103, abutting part; 104, second horizontal part; 105, second vertical part; 106, connecting part; 107, third horizontal part; 108, third vertical part; 109, fourth horizontal part; 1010, fourth vertical part; 200, cavity; 300, reinforcing plate; 400, buffer hole; 500, first mounting member; 510, first mounting plate; 511, first mounting plate body; 512, first upper convex part; 513, second upper convex part; 520, first connecting plate; 521, first connecting plate body; 5211, first buffer part; 5212, first welding part; 5213, second buffer part; 522, first transition part; 600, second mounting member; 610, second mounting plate; 611, second mounting plate body; 612, first lower concave part; 613, third lower concave part; 620, second connecting plate; 621, second connecting plate body; 622, second transition part; 6221, third buffer part; 6222, second abutting part; 6223, fourth buffer part; 623, through hole; 700, third mounting member; 710, third mounting plate; 711, third mounting plate body; 712, second lower concave part; 713, fourth lower concave part; 720, third connecting plate; 721, third connecting plate body; 722, third transition part; 800, connecting piece. Detailed implementation manners

[0036] To make the technical problems solved, the technical solutions adopted, and the technical effects achieved by the present utility model clearer, the technical solutions of the embodiments of the present utility model will be further described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative efforts belong to the scope of protection of the present utility model.

[0037] As Figure 1 shown, the side beam strengthening structure of the box body in this embodiment includes a side beam 100. The length of the side beam 100 extends along the x direction, the thickness of the side beam 100 extends along the y direction perpendicular to the x direction, and the side beam 100 has at least one cavity 200 with a length extending along the x direction. The side beam strengthening structure of the box body further includes a reinforcing plate 300. The reinforcing plate 300 is installed in one cavity 200 of the side beam 100, and a plurality of buffer holes 400 penetrating the reinforcing plate 300 along the y direction are spaced apart on the reinforcing plate 300.

[0038] Since a plurality of buffer holes 400 are spaced apart on the reinforcing plate 300 and the buffer holes 400 penetrate the reinforcing plate 300 along the y direction, the buffer holes 400 can enable the reinforcing plate 300 to have a good buffering effect on the impact force. When the battery pack is impacted, the impact force is buffered by the side beam strengthening structure of the box body and then transmitted to the inside of the box body 1, so that the impact force transmitted from the side beam 100 to the batteries in the battery pack can be greatly reduced, and the safety problems occurring during the impact of the battery pack can be reduced.

[0039] In this embodiment, the cross-section of the side beam 100 can be a "ri" shape, an "L" shape or a "mu" shape structure.

[0040] Further, the cross-section of the side beam 100 has at least three cavities 200 along the z direction, and the reinforcing plate 300 is installed in the cavity 200 adjacent to or located at the central position of the side beam 100 along the z direction. The z direction is perpendicular to the x direction and the y direction.

[0041] Specifically, the cross-section of the side beam 100 in this embodiment is a "mu" shape structure. The side beam 100 with the "mu" shape structure has three cavities 200 along the z direction, namely a first cavity, a second cavity and a third cavity. The reinforcing plate 300 is installed in the middle second cavity. Next, taking the side beam 100 with a cross-section of "mu" shape as an example, the side beam strengthening structure of the box body in this embodiment will be described in detail.

[0042] Specifically, as Figure 2 shown, the side beam 100 in this embodiment is bent from an aluminum plate into a "mu" shape structure. The side beam 100 includes:

[0043] The first horizontal portion 101, the first vertical portion 102 connected to one end of the first horizontal portion 101 in the y direction, and the first abutting portion 103 connected to the other end of the first horizontal portion 101 in the y direction. The first vertical portion 102 is located above the first horizontal portion 101, and the first abutting portion 103 is located below the first horizontal portion 101;

[0044] The second horizontal portion 104, which is located above the first horizontal portion 101 and is connected to the upper end of the first vertical portion 102. The first horizontal portion 101 and the second horizontal portion 104 are on the same side of the first vertical portion 102;

[0045] The second vertical portion 105, which is connected to one end of the second horizontal portion 104 away from the first vertical portion 102 through the bent connecting portion 106, and the second vertical portion 105 is located above the second horizontal portion 104;

[0046] The third horizontal portion 107, which is connected to one end of the second vertical portion 105 away from the second horizontal portion 104 and is located directly above the second horizontal portion 104;

[0047] The third vertical portion 108, which is connected to one end of the third horizontal portion 107 away from the second vertical portion 105 and extends downward to below the first horizontal portion 101. The first vertical portion 102 is closely attached to the third vertical portion 108;

[0048] The fourth horizontal portion 109, which is located directly below the first horizontal portion 101 and is connected to one end of the third vertical portion 108 away from the third horizontal portion 107;

[0049] The fourth vertical portion 1010, which is connected to one end of the fourth horizontal portion 109 away from the third vertical portion 108 and is located above the fourth horizontal portion 109. The fourth vertical portion 1010 extends upward to the connecting portion 106 and abuts against a side surface of the first abutting portion 103 along the horizontal direction away from the first horizontal portion 101, and a surface of the fourth vertical portion 1010 away from the third vertical portion 108 is in the same plane as a surface of the second vertical portion 105 away from the third vertical portion 108.

[0050] Specifically, the connecting portion 106 includes a vertical segment and an inclined segment that slopes upward toward the outside. The lower end of the vertical segment is connected to the second horizontal portion 104, the upper end of the vertical segment is connected to the lower end of the inclined segment, and the upper end of the inclined segment is connected to the lower end of the second vertical portion 105. The upper end of the fourth vertical portion 1010 is located at the connection of the vertical segment and the inclined segment, that is, at the corner of the connecting portion 106.

[0051] Among them, the first horizontal part 101, the first vertical part 102, the second horizontal part 104, and the fourth vertical part 1010 form a cavity 200 (the second cavity) for installing the reinforcement plate 300. One end of the buffer hole 400 on the reinforcement plate 300 faces the first vertical part 102, and the other end of the buffer hole 400 faces the fourth vertical part 1010.

[0052] The structure of the side beam 100 in this embodiment is stable and has relatively high strength.

[0053] Generally, the mounting beam is composed of a connecting plate and a mounting plate. After the connecting plate is welded and fixed to the side beam 100, the mounting plate is adjacent to or located at the central position of the side beam 100 in the vertical direction. Therefore, when the battery box is impacted, the impact force is mainly concentrated at the central position of the side beam 100 in the z direction or near the central position of the side beam 100 in the z direction. In this embodiment, the reinforcement plate 300 is installed adjacent to or located at the central position of the side beam 100 in the z direction. When impacted externally, the impact force is mainly buffered by the side beam 100 and the reinforcement plate 300 inside it, thereby reducing the impact force on the battery inside the side beam 100.

[0054] Furthermore, the reinforcement plate 300 is a cuboid plate-like structure, and the cross-section of the corresponding cavity 200 is a rectangular structure. One side of the reinforcement plate 300 in the thickness direction is adjacent to the inner plate (the first vertical part 102) of the side beam 100, and the other side of the reinforcement plate 300 in the thickness direction is adjacent to the outer plate (the fourth vertical part 1010) of the side beam 100. All the buffer holes 400 penetrate along the thickness direction of the reinforcement plate 300.

[0055] In this embodiment, by designing the reinforcement plate 300 as a cuboid plate-like structure and installing it in the cavity 200 of the side beam 100, and making the two ends of the buffer hole 400 face the inner plate (the first vertical part 102) and the outer plate (the fourth vertical part 1010) of the side beam 100 respectively, the structural strength of the side beam 100 can be further improved.

[0056] Optionally, the buffer hole 400 is a hexagonal structure, but it is not limited to this. In other embodiments, it can also be a triangular, rectangular, circular or elliptical structure.

[0057] In this embodiment, all the buffer holes 400 are evenly distributed in the x direction. Through the evenly distributed buffer holes 400, the buffering effect of the box side beam reinforcement structure on the impact force can be made more uniform.

[0058] Furthermore, the reinforcement plate 300 is a continuous glass fiber reinforced thermoplastic composite plate, which has a certain strength and a good buffering effect.

[0059] Furthermore, the reinforcing plate 300 is in clearance fit with the cavity 200, and the reinforcing plate 300 is fixed in the cavity 200 by foaming glue. Specifically, the upper and lower ends of the reinforcing plate 300 are respectively fixedly connected to the top wall and the bottom wall of the cavity 200 by foaming glue, and the buffer holes 400 are exposed outside the foaming glue to prevent the foaming glue from blocking the buffer holes 400 and affecting the buffering effect of the reinforcing plate 300 on the impact force.

[0060] In a further embodiment of the present utility model, as Figures 3-6 shown, the side beam strengthening structure of the box body further includes a mounting beam fixed on the side beam 100. The mounting beam includes a first mounting member 500, a second mounting member 600, and a third mounting member 700. The first mounting member 500 includes a first mounting plate 510 and a first connecting plate 520 connected to each other. The second mounting member 600 includes a second mounting plate 610 and a second connecting plate 620 connected to each other. The third mounting member 700 is located between the first mounting member 500 and the second mounting member 600, and the third mounting member 700 includes a third mounting plate 710 and a third connecting plate 720 connected to each other. The first mounting plate 510, the second mounting plate 610, and the third mounting plate 710 are fixedly connected by a connecting member 800. One end of the first connecting plate 520 away from the first mounting plate 510, one end of the second connecting plate 620 away from the second mounting plate 610, and one end of the third connecting plate 720 away from the third mounting plate 710 are respectively welded to the side beam 100.

[0061] In this embodiment, by arranging the third mounting member 700 between the first mounting member 500 and the second mounting member 600, the first connecting plate 520, the second connecting plate 620, and the third connecting plate 720 are fixedly connected by the connecting member 800, and the first mounting plate 510, the second mounting plate 610, and the third mounting plate 710 are respectively welded and fixed to the side beam 100. On the one hand, when subjected to an external force impact, the setting of the third mounting plate 710 can make the oscillation of the force-receiving surface transmitted to the side beam 100 more uniform, preventing the box body 1 from being damaged due to excessive impact force on a local area. On the other hand, the strength of the mounting beam is improved, and the load strength of the box body 1 can be increased. Therefore, by adding the third mounting member 700 in this embodiment, the compressive strength and load strength of the side beam strengthening structure of the box body can be effectively improved.

[0062] Optionally, any two of the first mounting plate 510, the second mounting plate 610, and the third mounting plate 710 are in close contact with each other. Of course, in other embodiments, it can also be designed that the three mounting plates are arranged at intervals from top to bottom.

[0063] Next, taking the close contact between the second mounting plate 610 and the third mounting plate 710 as an example, the mounting beam will be further described in detail.

[0064] Further, the first mounting plate 510 has a horizontally arranged first mounting plate body 511 and a plurality of first convex portions 512 that are convex upward on the surface of the first mounting plate body 511 by rolling. The length of the first mounting plate body 511 extends along the x-direction to both ends close to the side beam 100, and the plurality of first convex portions 512 are evenly distributed at intervals along the x-direction;

[0065] The second mounting plate 610 has a horizontally arranged second mounting plate body 611 and a plurality of first concave portions 612 that are concave downward on the surface of the second mounting plate body 611 by rolling. The length of the second mounting plate body 611 extends along the x-direction to both ends close to the side beam 100, and the plurality of first concave portions 612 are evenly distributed at intervals along the x-direction;

[0066] The third mounting plate 710 has a horizontally arranged third mounting plate body 711 and a plurality of second concave portions 712 that are concave downward on the surface of the third mounting plate body 711 by rolling. The length of the third mounting plate body 711 extends along the x-direction to both ends close to the side beam 100, and the plurality of second concave portions 712 are evenly distributed at intervals along the x-direction;

[0067] The first mounting plate body 511, the second mounting plate body 611, and the third mounting plate body 711 are closely attached to each other. The first concave portions 612 and the second concave portions 712 are in one-to-one correspondence and are closely attached and face the first convex portions 512. The first convex portions 512, the first concave portions 612, and the second concave portions 712 are fixedly connected by a connecting member 800.

[0068] In this embodiment, the first concave portions 612 and the second concave portions 712 are closely attached and face the first convex portions 512, which can improve the compressive strength and load-bearing strength of the box side beam reinforcement structure more than other combination methods.

[0069] Specifically, the first mounting plate 510 and the second mounting plate 610 are completely symmetric with respect to the central plane between the two.

[0070] Among them, each of the first convex portions 512, the first concave portions 612, and the second concave portions 712 is respectively provided with a connection hole. The connecting member 800 is a sleeve. The sleeve sequentially passes through the three connection holes and is respectively welded and fixed to the first convex portion 512, the first concave portion 612, and the second concave portion 712. Specifically, the connection hole is circular, the sleeve is a cylindrical structure. After the sleeve is sequentially inserted into the three connection holes, the upper end of the sleeve protrudes from the upper surface of the first convex portion 512, and the lower end of the sleeve protrudes from the lower surface of the second concave portion 712. The upper and lower side surfaces of the first convex portion 512 are respectively welded and fixed to the outer wall of the sleeve, and the upper surface of the first concave portion 612 and the lower surface of the second concave portion 712 are respectively welded and fixed to the outer wall of the sleeve.

[0071] Further, the first mounting plate 510 further has a plurality of second convex portions 513 that are convex upward from the surface of the first mounting plate body 511 by rolling. The plurality of second convex portions 513 are spaced along the x direction, and there are several second convex portions 513 between every two adjacent first convex portions 512;

[0072] The second mounting plate 610 has a plurality of third concave portions 613 that are concave downward from the surface of the second mounting plate body 611 by rolling. The plurality of third concave portions 613 are spaced along the x direction, and there are several third concave portions 613 between every two adjacent first concave portions 612;

[0073] The third mounting plate 710 has a plurality of fourth concave portions 713 that are concave downward from the surface of the third mounting plate body 711 by rolling. The plurality of fourth concave portions 713 are spaced along the x direction, and there are several fourth concave portions 713 between every two adjacent second concave portions 712;

[0074] The third concave portions 613 and the fourth concave portions 713 are in one-to-one correspondence, closely attached and facing the second convex portions 513.

[0075] In this embodiment, by rolling, a plurality of second convex portions 513 are formed on the surface of the second mounting plate body 611, a plurality of third concave portions 613 are formed on the surface of the second mounting plate body 611, and a plurality of fourth concave portions 713 are formed on the surface of the third mounting plate body 711. Compared with the close attachment in a completely flat state, the compressive strength of the box side beam strengthening structure can be more improved.

[0076] Further, as Figure 4 shown, there is one second convex portion 513 between some adjacent two first convex portions 512, and there are three second convex portions 513 between some adjacent two first convex portions 512. When there are three second convex portions 513 between two adjacent first convex portions 512, the width of the middle second convex portion 513 is greater than the widths of the second convex portions 513 on both sides, and the second convex portions 513 on both sides are symmetric with respect to the middle second convex portion 513. Since the second mounting plate 610 is completely symmetric with the first mounting plate 510, and the shape of the third mounting plate 710 is the same as that of the second mounting plate 610 and closely adheres to the upper surface of the second mounting plate 610, therefore, the specific structures of the concave portions on the second mounting plate 610 and the third mounting plate 710 corresponding to the second convex portions 513 will not be elaborated here.

[0077] Further, the first connecting plate 520 includes a connected first connecting plate body 521 and a first transition portion 522. One end of the first transition portion 522 away from the first connecting plate body 521 is connected to the first mounting plate 510. One end of the first transition portion 522 away from the first mounting plate 510 is inclined upward in a direction away from the first mounting plate 510. The first connecting plate body 521 is fixedly welded to the outer side surface of the side beam 100, and the first connecting plate body 521 is parallel to the outer side surface of the side beam 100;

[0078] The second connecting plate 620 includes a connected second connecting plate body 621 and a second transition portion 622. One end of the second transition portion 622 away from the second connecting plate body 621 is connected to the second mounting plate 610. One end of the second transition portion 622 away from the second mounting plate 610 is inclined downward in a direction away from the second mounting plate 610. The second connecting plate body 621 is welded to the bottom surface of the side beam 100, and the second connecting plate body 621 is parallel to the bottom surface of the side beam 100;

[0079] The third connecting plate 720 includes a connected third connecting plate body 721 and a third transition portion 722. One end of the third transition portion 722 away from the third connecting plate body 721 is connected to the third mounting plate 710. The third connecting plate body 721 is fixedly welded to the outer side surface of the side beam 100, and the third connecting plate body 721 is parallel to the outer side surface of the side beam 100.

[0080] In this embodiment, designing the first connecting plate body 521 and the third connecting plate body 721 to be close to the outer side surface of the side beam 100 and designing the second connecting plate body 621 to be close to the bottom surface of the side beam 100 and welding them to the side beam 100 respectively can, to a certain extent, improve the compressive strength of the box body side beam strengthening structure.

[0081] Further, as Figure 4 shown, the first connecting plate body 521 has a first buffer portion 5211 and a plurality of first welding portions 5212 that are recessed toward the inner side of the outer side surface of the side beam 100 by rolling on the surface of the first buffer portion 5211. The first buffer portion 5211 is spaced from the outer side surface of the side beam 100. The first welding portions 5212 are close to the outer side surface of the side beam 100 and are welded to the outer side surface of the side beam 100.

[0082] Since spot welding is usually used for welding and fixing, in this embodiment, a plurality of first welding portions 5212 that are recessed toward the inner side of the outer side surface of the side beam 100 are formed on the surface of the first buffer portion 5211 by rolling. Only the first welding portions 5212 are welded to the side beam 100. The first buffer portion 5211 is spaced from the side beam 100. When an electrical device, such as a vehicle body, is impacted, the first buffer portion 5211 can provide a certain buffering effect.

[0083] Among them, the first welding part 5212 corresponds to the first upward convex part 512 one by one, that is, the first welding part 5212 and the first upward convex part 512 are respectively located at two opposite ends of the first transition part 522.

[0084] In order to further improve the buffering effect of the box side beam strengthening structure, in this embodiment, a plurality of second buffer parts 5213 are roll-formed on the surface of the first buffer part 5211. Specifically, the second buffer parts 5213 are roll-pressed to protrude outward from the surface of the first buffer part 5211 away from the outer side surface of the side beam 100.

[0085] Furthermore, as Figure 5 shown, the thickness of the second connecting plate body 621 extends in the z direction perpendicular to the x direction. The second connecting plate body 621 is provided with a plurality of through holes 623 penetrating in the z direction, and the plurality of through holes 623 are evenly distributed in the x direction. The welding points of the second connecting plate body 621 and the bottom surface of the side beam 100 are located at the through holes 623. Specifically, the through hole 623 is an oval hole, the length of the oval hole is consistent with the length direction (x direction) of the second connecting plate body 621, and the two opposite inner walls of the oval hole in its width direction (y direction) are respectively welded to the bottom surface of the side beam 100. Compared with the conventional welding method in which the end of the connecting plate is welded to the side beam 100, the welding method of this embodiment can double the connection strength between the second connecting plate 620 and the side beam 100.

[0086] As Figure 5 shown, the second transition part 622 has a third buffer part 6221, a second abutting part 6222 that is roll-pressed to be concave inward from the surface of the third buffer part 6221 toward the outer side surface of the side beam 100, and a fourth buffer part 6223 that is roll-pressed to protrude outward from the outer side surface of the side beam 100. The second abutting part 6222 corresponds to the first concave part 612 one by one.

[0087] Since the load points of the battery pack and the box body 1 mainly exist in the sleeve (connector 800), and the sleeve is welded to the second concave part 712, in this embodiment, the position of the second abutting part 6222 is designed to correspond to the second concave part 712 one by one. By the abutting of the second abutting part 6222 against the side beam 100, the strength of the box side beam strengthening structure can be improved. The third buffer part 6221 and the fourth buffer part 6223 are respectively spaced apart from the side beam 100 by a certain distance, and the spacing distances between the third buffer part 6221 and the side beam 100 and between the fourth buffer part 6223 and the side beam 100 are inconsistent, which can achieve a multiple buffering effect.

[0088] Refer to Figure 7, this embodiment also provides a battery box, which includes a box body 1. The box body 1 includes a bottom guard plate 11 and four side beam structures 12. The four side beam structures 12 are located on the same side of the bottom guard plate 11 and are fixedly connected to the four sides of the bottom guard plate 11. The two ends of each side beam structure 12 in the x direction are respectively fixedly connected to the ends of an adjacent side beam structure 12. Among them, two opposite side beam structures 12 are the box body side beam strengthening structures described in the above embodiment.

[0089] In other embodiments, it may also be that three side beam structures 12 are the same as the box body side beam strengthening structures described in the above embodiment.

[0090] The battery box of this embodiment further includes a liquid cooling plate (not shown in the figure). The liquid cooling plate is located above the bottom guard plate 11 and is fixedly connected to the bottom guard plate 11 by bolts.

[0091] This embodiment also provides a battery pack, which includes a battery and the battery box described in the above embodiment. The battery is installed in the battery box.

[0092] Since a reinforcing plate 300 provided with a plurality of buffer holes 400 is installed in a cavity 200 of a side beam 100 of the side beam structure 12 of the battery box for installing the mounting beam, the strength of the battery box and the buffer effect on the impact force can be improved, and the impact force on the battery in the battery box can be reduced.

[0093] This embodiment also provides an electrical device, which includes a device body and also includes the battery pack described in the above embodiment. The outer sides of the side beams 100 of two opposite side beam structures 12 (box body side beam strengthening structures) of the battery box of the battery pack are installed on the device body through a mounting beam.

[0094] This electrical device can be a new energy vehicle, including a hybrid vehicle and a pure electric vehicle. The device body is the vehicle body of the new energy vehicle except for the battery pack. The battery box is installed on the device body through a mounting beam. The box body side beam strengthening structure of the battery box can effectively reduce the safety problems that occur during the impact of the battery pack of the new energy vehicle.

[0095] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the various embodiments of the present application, and they should all be covered within the scope of the claims and the description of the present application. In particular, as long as there is no structural conflict, the technical features mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed in the text, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A box side beam reinforcement structure, comprising a side beam, wherein the length of the side beam extends along the x direction, the thickness of the side beam extends along the y direction perpendicular to the x direction, and the side beam has at least one cavity whose length extends along the x direction, characterized in that: It also includes a reinforcing plate, which is installed in a cavity of the side beam, and the reinforcing plate is provided with a plurality of buffer holes that penetrate the reinforcing plate along the y direction at intervals.

2. The box side beam reinforcement structure according to claim 1, characterized in that: The cross section of the side beam has at least three cavities along the z direction, and the reinforcing plate is installed in the cavity adjacent to or located at the center position of the side beam along the z direction, and the z direction is perpendicular to the x direction and the y direction.

3. The box side beam reinforcement structure according to claim 1, characterized in that: The reinforcing plate is a rectangular plate-shaped structure, and the corresponding cross-section of the cavity is a rectangular structure. One side of the reinforcing plate along its thickness direction is adjacent to the inner plate of the side beam, and the other side of the reinforcing plate along its thickness direction is adjacent to the outer plate of the side beam, and all the buffer holes penetrate along the thickness direction of the reinforcing plate.

4. The box side beam reinforcement structure according to claim 1, characterized in that: All the buffer holes on the reinforcing plate are evenly distributed along the x-direction.

5. The box side beam reinforcement structure according to claim 1, characterized in that: The reinforcing plate is gap-matched with the cavity, and the reinforcing plate is fixedly connected with the cavity via foam glue.

6. The box side beam reinforcement structure according to any one of claims 1 to 5, characterized in that: It also includes a mounting beam fixed on the side beam, the mounting beam includes a first mounting member, a second mounting member and a third mounting member, the first mounting member includes a first mounting plate and a first connecting plate connected to each other, the second mounting member includes a second mounting plate and a second connecting plate connected to each other, the third mounting member is located between the first mounting member and the second mounting member, and the third mounting member includes a third mounting plate and a third connecting plate connected to each other, the first mounting plate, the second mounting plate and the third mounting plate are fixedly connected by a connecting member, and an end of the first connecting plate away from the first mounting plate, an end of the second connecting plate away from the third mounting plate, and an end of the third connecting plate away from the third mounting plate are respectively welded to the side beam.

7. The box side beam reinforcement structure according to claim 6, characterized in that: The first mounting plate comprises a first mounting plate body arranged horizontally and a plurality of first upper protrusions protruding from the surface of the first mounting plate body by rolling, the length of the first mounting plate body extending along the x-direction to the two ends close to the edge beam, and the plurality of first upper protrusions are evenly distributed along the x-direction; The second mounting plate comprises a second mounting plate body arranged horizontally and a plurality of first concave portions which are concave on the surface of the second mounting plate body by rolling, the length of the second mounting plate body extends along the x-direction to two ends close to the edge beam, and the plurality of first concave portions are evenly spaced along the x-direction; The third mounting plate comprises a third mounting plate body arranged horizontally and a plurality of second recessed portions recessed on the surface of the third mounting plate body by rolling, the length of the third mounting plate body extending along the x-direction to the two ends close to the side beam, and the plurality of second recessed portions are evenly spaced along the x-direction; The first mounting plate body, the second mounting plate body and the third mounting plate body are tightly attached to each other, the first recessed portion and the second recessed portion correspond to each other tightly to each other and face the first convex portion, and the first convex portion, the first recessed portion and the second recessed portion are fixedly connected by the connecting member.

8. A battery box, comprising a box body, the box body comprising a bottom guard plate and four side beam structures, the four side beam structures are located on the same side of the bottom guard plate and are fixedly connected to the four sides of the bottom guard plate, and the two ends of each side beam structure are respectively fixedly connected to the end of an adjacent side beam structure, characterized in that: Among the four side beam structures, at least two opposite side beam structures are the box side beam reinforcement structures as described in any one of claims 1-7.

9. A battery pack, comprising a battery, characterized in that: It also includes the battery box as described in claim 8, wherein the battery is installed in the battery box.

10. An electrical device, comprising a device body, characterized in that: It also includes the battery pack as described in claim 9, wherein the outer side of the side beam of the box side beam reinforcement structure of the battery box of the battery pack is installed on the equipment body through a mounting beam.

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