Battery box and vehicle

Abstract

The present application discloses a battery box and a vehicle, the battery box comprising a box body and a beam body; the box body at least comprises a box bottom wall and a box side wall, the box bottom wall and the box side wall are arranged to form a receiving cavity, the receiving cavity is used to receive the battery; the beam body is fixed in the receiving cavity; the beam body comprises a spliced ​​upper beam and a lower beam, the upper beam and the lower beam are both U-shaped structures, the opening of the upper beam and the opening of the lower beam are arranged facing each other, at least part of the side beam wall of the upper beam overlaps at least part of the side beam wall of the lower beam; at least part of the overlapping section of the side beam wall of the upper beam and the side beam wall of the lower beam is arranged in a direction perpendicular to the box bottom wall; the beam side wall of the lower beam is located between the two beam side walls of the upper beam; the ratio L1 / L2 of the height L1 of the side beam wall of the lower beam and the height L2 of the upper beam is 0.06~1. The battery box can improve the structural strength while reducing the cost.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery box and a vehicle. Background Art

[0002] The battery case of the battery pack is a key component that carries the battery cell components. Its safety, reliability, durability and cost must also be considered during design.

[0003] How to save costs while improving the structural strength of the battery case is a research topic for technicians in this field. Summary of the invention

[0004] The purpose of the present application is to provide a battery box and a vehicle, wherein the battery box can reduce costs while improving structural strength.

[0005] In order to solve the above technical problems, the embodiment of the present application provides a battery box, including a box body and a beam body;

[0006] The box body at least comprises a box bottom wall and a box side wall, wherein the box bottom wall and the box side wall are arranged to form a receiving cavity, and the receiving cavity is used to receive the battery; the beam body is fixedly arranged in the receiving cavity;

[0007] The beam body comprises an upper beam and a lower beam which are spliced ​​together, the upper beam and the lower beam are both U-shaped structures, the opening of the upper beam and the opening of the lower beam are arranged facing each other, at least a part of the side beam wall of the upper beam overlaps at least a part of the side beam wall of the lower beam; at least a part of the overlapping section of the side beam wall of the upper beam and the side beam wall of the lower beam is arranged in a direction perpendicular to the box bottom wall;

[0008] The beam side wall of the lower beam is located between the two beam side walls of the upper beam;

[0009] The ratio L1 / L2 of the height L1 of the side beam wall of the lower beam to the height L2 of the upper beam is 0.06-1.

[0010] An embodiment of the present application also provides a vehicle, including a vehicle body and a battery box installed on the vehicle body, wherein the battery box is the battery box described above.

[0011] The battery box provided in the embodiment of the present application can be used in vehicles. The battery box has an improved beam structure inside the box body. The beam is formed by splicing two U-shaped beam structures. It is a split structure and can avoid mold opening costs. After splicing, at least part of the side beam wall of the upper beam overlaps with at least part of the side beam wall of the lower beam, and at least part of the overlapping section is perpendicular to the bottom wall of the box. In the overlapping position, the thickness of the beam wall of the beam body is increased, which can increase the supporting strength of the beam body and avoid the problem of insufficient supporting strength due to the high height of the beam body. After the beam body is applied to the battery box, when the battery box is squeezed or impacted by external force, it is beneficial to ensure the shape of the battery box and reduce the probability of deformation of the battery box, thereby avoiding the battery cell assembly from being squeezed and causing short circuits and other adverse phenomena, and can provide better protection for the battery cell assembly, which helps to improve safety.

[0012] At the same time, the ratio L1 / L2 of the height L1 of the side beam wall of the lower beam to the height L2 of the upper beam is 0.06-1. In this way, while avoiding adding extra weight to the battery box, the supporting strength of the beam body to the box body can be guaranteed. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 A schematic diagram of the structure of a battery box in an embodiment provided in the present application;

[0014] Figure 2 A schematic diagram of the structure of a beam body in an embodiment provided in the present application;

[0015] Figure 3 for Figure 2 A schematic cross-sectional view of the beam body shown;

[0016] Figure 4 It is a cross-sectional schematic diagram of the cooperation between the beam body and the bottom wall of the box in a specific embodiment;

[0017] Figure 5 is a schematic structural diagram of a connection portion between a fifth beam and a third beam in a specific embodiment;

[0018] Figure 6 It is a schematic structural diagram of the connection portion between the fifth beam and the first box side wall in a specific embodiment.

[0019] Description of reference numerals:

[0020] Battery box 10;

[0021] Box body 20, box bottom wall 21, first box side wall 221, through hole 2211, second box side wall 222, third box side wall 223, fourth box side wall 224;

[0022] A first beam 301, a second beam 302, a third beam 303, a fourth beam 304, and a fifth beam 305;

[0023] The beam body 30 , the upper beam 31 , the first side beam wall 311 , the top beam wall 312 , the flange 313 , the lower beam 32 , the second side beam wall 321 , and the bottom beam wall 322 . DETAILED DESCRIPTION

[0024] In order to enable those skilled in the art to better understand the present application, the present application is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0025] The ordinal numbers such as first and second used in this article are to distinguish different components with the same name, and do not indicate a specific order or a primary and secondary relationship.

[0026] The directional words such as up (top), down (bottom) etc. used in this article are defined based on the positions of the components in the figure and the relative positions between the components. The use of the directional words is only for the clarity and convenience of describing the technical solution and should not be understood as limiting the scope of protection.

[0027] Please refer to Figure 1 , Figure 1 A schematic structural diagram of a battery box in an embodiment is shown.

[0028] In this embodiment, the battery box 10 includes a box body 20 . The box body 20 is generally an open frame structure. The box body 20 includes a box bottom wall 21 and box side walls surrounding the box bottom wall 21 .

[0029] In the illustrated example, the box body 20 is roughly rectangular in structure, and includes four box side walls, which are respectively a first box side wall 221, a second box side wall 222, a third box side wall 223 and a fourth box side wall 224, wherein the first box side wall 221 and the third box side wall 223 are arranged opposite to each other, and the second box side wall 222 and the fourth box side wall 224 are arranged opposite to each other.

[0030] In other embodiments, the outer shape of the box body 20 may also be in other forms, such as a runway shape or the like, and the box side walls may be matched therewith.

[0031] The box bottom wall 21 and the box side walls of the box body 20 enclose a receiving cavity, which is used to accommodate batteries. The receiving cavity can also be used to accommodate control components related to the battery.

[0032] The battery box 10 may further include a box cover (not shown in the figure), which is used to seal the opening of the box body 20 to form a closed chamber to protect the batteries and related control components accommodated in the box body 20.

[0033] In this embodiment, the battery box 10 also includes a plurality of beams fixed in the accommodating cavity. These beams can divide the accommodating cavity to form different spaces, which facilitates the installation of different components accommodated in the box body 20. At the same time, these beams can also play a role in improving the structural strength of the battery box 10.

[0034] exist Figure 1 In the example shown, the battery box 10 is provided with five beams, namely a first beam 301 , a second beam 302 , a third beam 303 , a fourth beam 304 and a fifth beam 305 .

[0035] Among them, the third beam 303 is arranged close to the first box side wall 221, and the two ends of the third beam 303 can be fixedly connected to the second box side wall 222 and the fourth box side wall 224 respectively, and the third beam 303, the first box side wall 221, the second box side wall 222 and the fourth box side wall 224 can enclose a space for installing control components, etc.

[0036] Among them, the fourth beam 304 is arranged adjacent to the third box side wall 223, and the two ends of the fourth beam 304 can be fixedly connected to the second box side wall 222 and the fourth box side wall 224 respectively, the extension direction of the first beam 301 and the second beam 302 is consistent with the extension direction of the second box side wall 222 and the fourth box side wall 224, and the two ends of the first beam 301 and the second beam 302 can be fixedly connected to the third beam 303 and the fourth beam 304 respectively, the third beam 303, the second box side wall 222, the fourth beam 304 and the first beam 301 can enclose a space for accommodating batteries, and the second beam 302, the fourth beam 304, the fourth box side wall 224 and the third beam 303 can also enclose a space for accommodating batteries.

[0037] The fifth beam 305 is disposed between the first box side wall 221 and the third beam 303 .

[0038] In other embodiments, the specific number and arrangement of the beams of the battery box 10 are set according to actual application requirements and are not limited to Figure 1 shown.

[0039] This embodiment focuses on improving the structure of the beam of the battery box 10. In the application, at least one beam in the box body 20 may adopt the beam body 30 provided in this embodiment. Figure 1 In the example shown, at least one of the first beam 301 , the second beam 302 , the third beam 303 , the fourth beam 304 and the fifth beam 305 uses the beam body 30 provided in this embodiment.

[0040] Please refer to Figure 2 and Figure 3 , Figure 2 This is a schematic diagram of the structure of a beam body in an embodiment provided in the present application. Figure 3 for Figure 2 Schematic diagram of the cross section of the beam shown.

[0041] Here, the fifth beam 305 adopts the beam body 30 improved by the present embodiment as an example. Figure 2 The beam body 30 shown in FIG. 1 can be understood as Figure 1 The fifth beam 305 in.

[0042] In other embodiments, the remaining beams may also be Figure 2 The structure of the beam body 30 shown will not be described one by one.

[0043] like Figure 2 As shown, the beam body 30 provided in this embodiment includes a spliced ​​upper beam 31 and a lower beam 32, and the upper beam 31 and the lower beam 32 are both U-shaped structures. The opening of the upper beam 31 and the opening of the lower beam 32 are arranged opposite to each other, that is, the opening of the upper beam 31 faces downward, and the opening of the lower beam 32 faces upward; at least a portion of the side beam wall of the upper beam 31 overlaps with at least a portion of the side beam wall of the lower beam 32.

[0044] The U-shaped structure here refers to a structure consisting of a bottom plate (or top plate) and side plates extending from both sides of the bottom plate (or top plate) and arranged at an angle with the bottom plate (or top plate).

[0045] For convenience of description, the side beam wall of the upper beam 31 is called the first side beam wall 311, and the side beam wall of the lower beam 32 is called the second side beam wall 321. The upper beam 31 also includes a top beam wall 312 connecting the two first side beam walls 311, and the lower beam 32 also includes a bottom beam wall 322 connecting the two second side beam walls 321.

[0046] After the upper beam 31 and the lower beam 32 are spliced ​​to form the beam body 30 , the first side beam wall 311 and the second side beam wall 321 have at least a partial overlapping section, and at least a portion of the overlapping section is arranged in a direction perpendicular to the box bottom wall 21 .

[0047] The beam body 30 is formed by splicing two U-shaped beam structures, which is a split structure and can avoid mold opening costs. After splicing, at least part of the first side beam wall 311 of the upper beam 31 overlaps with at least part of the second side beam wall 321 of the lower beam 32. In the overlapping position, the beam wall thickness of the beam body 30 is increased, which can increase the support strength of the beam body 30 and avoid the problem of insufficient support strength when the height of the beam body 30 is high. After the beam body 30 is applied to the battery box 10, when the battery box 10 is squeezed or impacted by external force, it is beneficial to ensure the shape of the battery box 10 and reduce the probability of deformation of the battery box 10, thereby avoiding the battery from being squeezed and causing short circuits and other adverse phenomena, which can better protect the battery and help improve safety.

[0048] like Figure 3As shown, the height of the second side beam wall 321 of the lower beam 32 is L1, and the height of the upper beam 31 is L2. In one implementation, the ratio L1 / L2 of the height L1 of the second side beam wall 321 to the height L2 of the upper beam 31 is 0.06-1.

[0049] Herein, the height L1 of the second side beam wall 321 is the distance between the top wall surface of the second side beam wall 321 and the top wall surface of the bottom beam wall 322 in the direction perpendicular to the box bottom wall 21; the height L2 of the upper beam 31 is the distance between the top wall surface of the top beam wall 312 of the upper beam 31 and the bottom wall surface of the first side beam wall 311 in the direction perpendicular to the box bottom wall 21.

[0050] As configured above, the support strength of the beam 30 to the box body 20 can be ensured while avoiding adding extra weight to the battery box body 10 .

[0051] In application, the ratio L1 / L2 should not be too small or too large. If the ratio L1 / L2 is too large, it will cause material waste and increase the weight of the beam 30 on the basis of having the required support strength, which is not conducive to the lightweight of the battery box 10. If the ratio L1 / L2 is too small, the support strength of the beam 30 is insufficient, making the battery box 10 easily deformed when subjected to external force. Exemplarily, the ratio L1 / L2 can be 0.06, 0.08, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9 or 1, that is, the ratio L1 / L2 can be any value between 0.06 and 1.

[0052] In a specific implementation, the ratio L1 / L2 of the height L1 of the second side beam wall 321 to the height L2 of the upper beam 31 may be determined in combination with the materials of the upper beam 31 and the lower beam 32 .

[0053] For example, when the upper beam 31 and the lower beam 32 are made of steel, that is, the beam body 30 is a steel structure, the ratio L1 / L2 of the height L1 of the second side beam wall 321 to the height L2 of the upper beam 31 can be 0.06 to 1. Considering that steel has a high structural strength, the ratio L1 / L2 can be set relatively small.

[0054] In one implementation, both the upper beam 31 and the lower beam 32 can be made of plates and formed by bending, which is easy to process and has low cost.

[0055] like Figure 3 As shown, the thickness of the first side beam wall 311 of the upper beam 31 is M1, the thickness of the second side beam wall 321 of the lower beam 32 is M2, and when the beam body 30 is set, M1, M2 and L1 satisfy the following relationship: (M1 / L1)×M2=0.01~2. Specifically, the thickness of the first side beam wall 311 and the thickness of the second side beam wall 321 can both be referenced by the minimum thickness.

[0056] Exemplarily, the value ranges of M1, M2, L1 and (M1 / L1)×M2 may be as shown in the following table:

[0057]

[0058] The thickness of the plate determines the length of the height of the bending zone, that is, when the plate is bent to form the upper beam 31 or the lower beam 32, the thickness of the plate determines the height of the side beam wall (including the first side beam wall 311 and the second side beam wall 321). When the plate is thicker, the height of the bending zone can be relatively short to avoid redundant design, resulting in material waste and increasing the extra weight of the battery box 10. When the plate is thinner, the height of the bending zone can be relatively long to ensure support strength.

[0059] In one implementation, the second side beam wall 321 of the lower beam 32 is located inside the first side beam wall 311 of the upper beam 31. The inside here refers to the side close to the beam cavity of the upper beam 31, that is, the second side beam wall 321 of the lower beam 32 is located between the two first side beam walls 311 of the upper beam 31.

[0060] like Figure 2 and Figure 3 As shown, after the second side beam wall 321 of the lower beam 32 is arranged on the inner side of the first side beam wall 311 of the upper beam 31, the overlapping portion of the second side beam wall 321 and the first side beam wall 311 is located on the inner side of the beam body 30. After being applied to the battery box body 10, it will not occupy the accommodating space of the box body 20, which can improve the space utilization rate of the battery box body 10 and facilitate the arrangement of related structures.

[0061] Please refer to Figure 4 , Figure 4 It is a cross-sectional schematic diagram of the cooperation between the beam body and the bottom wall of the box in a specific embodiment.

[0062] In one implementation, the beam body 30 is fixed to the box bottom wall 21 of the box body 20 by welding, and the upper beam 31 and the lower beam 32 of the beam body 30 are fixed by welding.

[0063] In a specific implementation, in the height direction perpendicular to the box bottom wall 21, the lower beam 32 is provided with a non-overlapping portion that does not overlap with the upper beam 31 near the box bottom wall 21, that is, the outer wall surface of the bottom beam wall 322 of the lower beam 32 is lower than the bottom wall surface of the first side beam wall 311 of the upper beam 31.

[0064] After the above arrangement, the upper beam 31 and the lower beam 32 of the beam body 30 can be welded to the box bottom wall 21 in one welding process. The welding position is between the outer wall surface of the non-overlapping portion of the lower beam 32, the bottom wall surface of the first side beam wall 311 and the box bottom wall 21. After welding, a weld is formed, which is referred to as the first welding line 1S. Figure 4In this way, the welding efficiency can be improved, and the assembly efficiency of the battery box 10 can be effectively improved.

[0065] For example, the first welding line 1S may be a continuous weld extending along the length direction of the beam body 30. In this way, the connection strength between the upper beam 31, the lower beam 32 and the box bottom wall 21 may be improved.

[0066] For example, the first welding line 1S may also include a plurality of welding spots arranged at intervals along the length direction of the beam body 30. In this way, the cost can be saved.

[0067] like Figure 3 As shown, the distance between the bottom wall surface of the non-overlapping portion of the lower beam 32 (i.e., the outer wall surface of the bottom beam wall 322) and the bottom wall surface of the first side beam wall 311 of the upper beam 31 is H1, and the ratio L1 / H1 of the distance H1 to the height L1 of the second side beam wall 321 of the lower beam 32 is 1~800.

[0068] Combination Figure 4 The non-overlapping portion of the lower beam 32 is equivalent to forming an escape space between the first side beam wall 311 and the box bottom wall 21. The escape space can realize the welding of the upper beam 31, the lower beam 32 and the box bottom wall 21 in one welding process. The size of the escape space is related to the welding strength. When the height of the second side beam wall 321 increases, in order to ensure the welding strength, the escape distance H1 should also increase.

[0069] In the application, the ratio L1 / H1 should not be too large or too small. If it is set too large, the welding strength cannot be guaranteed. If it is set too small, the design will be redundant and wasteful. The above setting of the ratio L1 / H1 can take into account both welding strength and cost.

[0070] In application, the setting of the ratio L1 / H1 can be determined by referring to the welding method, the material of the beam body 30 and the solder.

[0071] In one implementation, when the ratio L1 / L2 of the height L1 of the second side beam wall 321 of the lower beam 32 to the height L2 of the upper beam 31 is 0.8-1, the second side beam wall 321 is welded and fixed to the first side beam wall 311 .

[0072] The welding position of the second side beam wall 321 and the first side beam wall 311 can be set as required, such as Figure 4 As shown, the top wall of the second side beam wall 321 is welded to the first side beam wall 311, and after welding, a weld is formed, which is referred to as the second weld line 2S. In this way, the connection strength between the upper beam 31 and the lower beam 32 can be ensured, and the support strength of the beam body 30 to the battery box body 10 can be effectively improved.

[0073] For example, the second welding line 2S may be a continuous welding seam extending along the length direction of the beam body 30. In this way, the connection strength between the upper beam 31 and the lower beam 32 may be improved.

[0074] For example, the second welding line 2S may also include a plurality of welding spots arranged at intervals along the length direction of the beam body 30. In this way, the cost can be saved.

[0075] In one implementation, when the position of the second welding line 2S is higher than 1 / 2 of the height L1 of the second side beam wall 321 of the lower beam 32, the ratio L1 / L2 of the height L1 of the second side beam wall 321 of the lower beam 32 to the height L2 of the upper beam is 0.07~1; when the position of the second welding line 2S is lower than 1 / 2 of the height L1 of the second side beam wall 321 of the lower beam 32, the ratio L1 / L2 of the height L1 of the second side beam wall 321 of the lower beam 32 to the height L2 of the upper beam is 0.06~1.

[0076] The welding position between the second side beam wall 321 and the first side beam wall 311 , that is, the height of the second welding line S2 , determines the supporting strength of the beam body 30 . Relatively speaking, the higher the height of the second welding line S2 , the higher the height requirement for the lower beam 32 .

[0077] In one implementation, Figure 2 As shown, at least one end of at least one beam wall of the upper beam 31 has a flange 313 extending in a direction away from the center of the upper beam 31 .

[0078] In other words, the beam wall of the upper beam 31 includes two first side beam walls 311 and one top beam wall 312 , and at least one end of at least one of the two first side beam walls 311 and one top beam wall 312 has a flange 313 extending away from the center of the upper beam 31 .

[0079] In application, the flange 313 can also be formed by bending.

[0080] After the above arrangement, the beam body 30 can be welded and fixed to the box side wall of the adjacent box body 20 or other box beams arranged in the box body 20 through the flange 313 at the end portion in the length direction.

[0081] Below is still Figure 1 The fifth beam 305 shown in FIG. 1 is an example of the structure of the beam body 30 described above. Please refer to Figure 5 and Figure 6 , Figure 5 is a schematic structural diagram of the connection portion between the fifth beam and the third beam in a specific embodiment, Figure 6 It is a schematic structural diagram of the connection portion between the fifth beam and the first box side wall in a specific embodiment.

[0082] exist Figure 1In the example shown, the fifth beam 305 is located between the first box side wall 221 and the third beam 303 , and both ends of the fifth beam 305 can be fixedly connected to the first box side wall 221 and the third beam 303 respectively, so as to improve the overall structural strength of the battery box 10 .

[0083] In the fifth beam 305, Figures 2 to 4 In the structure of the beam body 30 shown, the beam body 30 can be fixedly connected to the first box side wall 221 or the third beam 303 through the flange 313 .

[0084] like Figure 5 As shown, the upper beam 31 of the beam body 30 is provided with three flanges 313 at one end close to the third beam 303, that is, the ends of the two first side beam walls 311 and the one top beam wall 312 close to the third beam 303 are provided with flanges 313, and the three flanges 313 can be fitted and fixed with the side walls of the third beam 303. The fixing method can be welding, which is convenient and easy to implement and has high connection reliability.

[0085] like Figure 6 As shown, the upper beam 31 of the beam body 30 is provided with a flange 313 at one end close to the first box side wall 221, and the flange 313 is formed by bending the end of a first side beam wall 311 of the upper beam 31 close to the first box side wall 221. In the illustrated example, the above-mentioned setting is related to the structure of the first box side wall 221. The first box side wall 221 has a through hole 2211 at a portion close to the beam body 30, and the first box side wall 221 is a stepped structure, so the upper beam 31 has only one flange 313 of the first side beam wall 311 that can be fixedly matched with the first box side wall 221.

[0086] In other embodiments, the number and position of the flanges 313 provided at the end of the upper beam 31 can be determined as needed. For example, the flange 313 can be provided only on the top beam wall 312 or only on the first side beam wall 311 .

[0087] In a specific implementation, when the beam body 30 is a box crossbeam extending along the width direction of the box body 20, Figure 1 As shown in the example, when the beam body 30 is a box body cross beam extending in the same direction as the first box side wall 221 or the third box side wall 223, the ratio L1 / L2 of the height L1 of the second side beam wall 321 of the lower beam 32 and the height L2 of the upper beam 31 is 0.06~1.

[0088] In a specific implementation, when the beam body 30 is a box longitudinal beam extending along the length direction of the box body 20, Figure 1 As shown in the example, when the beam body 30 is a box longitudinal beam extending in the same direction as the second box side wall 222 or the fourth box side wall 224, the ratio L1 / L2 of the height L1 of the second side beam wall 321 of the lower beam 32 and the height L2 of the upper beam 31 is 0.08~1.

[0089] Generally speaking, the length of the box body longitudinal beam is greater than the length of the box body cross beam. When the beam body 30 is used as the box body longitudinal beam, the height L1 of the second side beam wall 321 of the lower beam 32 can be set relatively large to ensure the supporting strength of the box body 20. When the beam body 30 is used as the box body cross beam, the height L1 of the second side beam wall 321 of the lower beam 32 can be set relatively small to avoid redundant design while taking into account the supporting effect.

[0090] In a specific implementation, the accommodating cavity of the box body 20 includes a battery compartment and an electrical compartment, wherein the battery compartment is used to place batteries, and the electrical compartment is used to place control components, etc.; when the beam body 30 is used to separate the battery compartment and the electrical compartment, the ratio L1 of the height L1 of the second side beam wall 321 of the lower beam 32 and the height L2 of the upper beam 31 is 0.06~1.

[0091] In a specific implementation, the accommodating cavity of the box body 20 includes more than two battery compartments, for example, a first battery compartment and a second battery compartment. When the beam body 30 is used to separate the first battery compartment and the second battery compartment, the ratio L1 / L2 of the height L1 of the second side beam wall 321 of the lower beam 32 and the height L2 of the upper beam 31 is 0.08~1.

[0092] When the beam body 30 is used to divide the battery compartment, the batteries in the battery compartment may expand and exert pressure on the beam body 30. At this time, the height L1 of the second side beam wall 321 of the lower beam 32 can be set relatively large to improve the supporting strength of the beam body 30. Relatively speaking, when only one side of the beam body 30 is an electrical compartment, such as when the beam body 30 is used to separate the battery compartment and the electrical compartment, the height L1 of the second side beam wall 321 of the lower beam 32 can be set relatively small. When both sides of the beam body 30 are electrical compartments, such as when the beam body 30 is used to separate two battery compartments, the height L1 of the second side beam wall 321 of the lower beam 32 can be set relatively large.

[0093] An embodiment of the present application also provides a vehicle, which includes a vehicle body and a battery box installed on the vehicle body. The battery box is the battery box provided in the above embodiment, has the corresponding technical effect, and will not be repeated here.

[0094] Exemplarily, the box battery can be installed at the bottom of the vehicle body.

[0095] Specific examples are used herein to illustrate the principles and implementation methods of the present application, and the description of the above embodiments is only used to help understand the method and core ideas of the present application. It should be pointed out that for ordinary technicians in this technical field, without departing from the principles of the present application, several improvements and modifications can be made to the present application, and these improvements and modifications also fall within the scope of protection of the claims of the present application.

Claims

1. A battery box, characterized in that: It includes a box body and a beam body; The box body at least comprises a box bottom wall and a box side wall, wherein the box bottom wall and the box side wall are arranged to form a receiving cavity, and the receiving cavity is used to receive the battery; the beam body is fixedly arranged in the receiving cavity; The beam body comprises an upper beam and a lower beam which are spliced ​​together, the upper beam and the lower beam are both U-shaped structures, the opening of the upper beam and the opening of the lower beam are arranged facing each other, at least a part of the side beam wall of the upper beam overlaps at least a part of the side beam wall of the lower beam; at least a part of the overlapping section of the side beam wall of the upper beam and the side beam wall of the lower beam is arranged in a direction perpendicular to the box bottom wall; The beam side wall of the lower beam is located between the two beam side walls of the upper beam; The ratio L1 / L2 of the height L1 of the side beam wall of the lower beam to the height L2 of the upper beam is 0.06-1; The thickness M1 of the side beam wall of the upper beam, the thickness M2 of the side beam wall of the lower beam, and the height L1 of the side beam wall of the lower beam satisfy the following relationship: (M1 / L1)×M2=0.01~2; The beam body is fixedly welded to the bottom wall of the box body, and the upper beam is fixedly welded to the lower beam; In the height direction perpendicular to the box bottom wall, the lower beam is provided with a non-overlapping portion that does not overlap with the upper beam near the box bottom wall, and the outer wall surface of the non-overlapping portion, the bottom wall surface of the side beam wall of the upper beam and the box bottom wall are welded by a first welding line.

2. The battery box according to claim 1, characterized in that: The distance between the bottom wall surface of the non-overlapping portion and the bottom wall surface of the side beam wall of the upper beam is H1, and the ratio L1 / H1 of the distance H1 to the height L1 of the side beam wall of the lower beam is 1-800.

3. The battery box according to claim 1, characterized in that: When the ratio L1 / L2 of the height L1 of the side beam wall of the lower beam to the height L2 of the upper beam is 0.8-1, the side beam wall of the lower beam is fixed to the side beam wall of the upper beam by welding through the second welding line.

4. The battery box according to claim 3, characterized in that: When the position of the second welding line is higher than 1 / 2 of the height L1 of the side beam wall of the lower beam, the ratio L1 / L2 of the height L1 of the side beam wall of the lower beam to the height L2 of the upper beam is 0.07-1.

5. The battery case according to claim 3, characterized in that: When the position of the second welding line is lower than 1 / 2 of the height L1 of the side beam wall of the lower beam, the ratio L1 / L2 of the height L1 of the side beam wall of the lower beam to the height L2 of the upper beam is 0.06-1.

6. The battery case according to any one of claims 1 to 5, characterized in that: At least one end of at least one beam wall of the upper beam has a flange extending in a direction away from the upper beam, and the flange is used for welding and fixing with other box beams in the accommodating cavity.

7. The battery case according to any one of claims 1 to 5, characterized in that: The beam body is made of steel, and a ratio L1 / L2 of a height L1 of a side beam wall of the lower beam to a height L2 of the upper beam is 0.06-1.

8. The battery case according to any one of claims 1 to 5, characterized in that: When the beam body is a box body cross beam extending along the width direction of the box body, a ratio L1 / L2 of a height L1 of a side beam wall of the lower beam and a height L2 of the upper beam is 0.06-1.

9. The battery case according to any one of claims 1 to 5, characterized in that: When the beam body is a box body longitudinal beam extending along the length direction of the box body, a ratio L1 / L2 of a height L1 of a side beam wall of the lower beam and a height L2 of the upper beam is 0.08-1.

10. The battery case according to any one of claims 1 to 5, characterized in that: The accommodating cavity includes a battery compartment and an electrical compartment. When the beam body is used to separate the battery compartment and the electrical compartment, the ratio L1 / L2 of the height L1 of the side beam wall of the lower beam and the height L2 of the upper beam is 0.06~1.

11. The battery case according to any one of claims 1 to 5, characterized in that: The accommodating cavity includes a first battery compartment and a second battery compartment. When the beam body is used to divide the first battery compartment and the second battery compartment, a ratio L1 / L2 of a height L1 of a side beam wall of the lower beam and a height L2 of the upper beam is 0.08-1.

12. A vehicle, characterized in that It comprises a vehicle body and a battery box installed on the vehicle body, and the battery box is the battery box according to any one of claims 1-11.

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