Hanging beam, battery lower box body, battery pack and vehicle

Abstract

The utility model discloses a mounting beam, battery lower box, battery pack and vehicle, the mounting beam includes beam body and bushing, beam body includes the roof and bottom plate that are arranged along first direction at interval, bottom plate has the first surface that is opposite to the roof, the bushing is connected with roof and bottom plate, the bushing is located the first surface of bottom plate and faces the roof side, and the bushing is connected with the first surface of bottom plate. A mounting hole and a counterbore which are arranged in the first direction and communicate with each other are formed in the bush, and the diameter of the mounting hole is smaller than that of the counterbore. The mounting beam provided by the utility model has the advantages that the head of the threaded part is prevented from being exposed to influence the appearance attractiveness of a vehicle body and collide with other parts, and the mounting reliability of the battery pack on the vehicle body is high.

Description

Technical Field

[0001] The utility model discloses a vehicle technical field, in particular to a mounting beam, a battery lower box body, a battery pack and a vehicle. Background Art

[0002] The beam bodies of the mounting beams on the battery pack are all day-shaped rolled beams, that is, two rectangular cavities arranged along the width direction are formed, or a rectangular cavity and a trapezoidal cavity arranged along the width direction are formed. Among them, the bushing is connected to the part of the beam body where the rectangular cavity is formed, and the bolt passes through the bushing from bottom to top and is in threaded cooperation with the nut on the vehicle body to realize the installation of the battery pack on the vehicle body. In the related art, after the battery pack is installed on the vehicle body, the head of the bolt is usually exposed under the beam body, and thus there are defects of poor appearance and easy collision of the bolt head with other components.

[0003] In the related art, there is also a scheme in which the bushing is connected to the top plate of the beam body and is spaced apart from the bottom plate, and a through hole for the head of the bolt to pass through is provided on the bottom plate of the beam body, so that the head of the bolt can be hidden in the through hole of the rectangular cavity. However, this setting has the defect that the bottom plate of the beam body cannot bear the battery pack, and the installation reliability of the battery pack on the vehicle body is poor. Summary of the Utility Model

[0004] The utility model aims to solve at least one of the technical problems in the related art to a certain extent.

[0005] For this reason, an embodiment of the utility model provides a mounting beam, which has the advantages of avoiding the head of the threaded part from being exposed to affect the appearance of the vehicle body and colliding with other components, and high installation reliability of the battery pack on the vehicle body.

[0006] The embodiment of the utility model also provides a battery lower box body, a battery pack and a vehicle.

[0007] The mounting beam of the embodiment of the utility model includes a beam body and a bushing. The beam body includes a top plate and a bottom plate arranged at intervals along a first direction. The bottom plate has a first surface opposite to the top plate. The bushing is connected to each of the top plate and the bottom plate. The bushing is located on one side of the first surface of the bottom plate facing the top plate. The bushing is formed with an installation hole and a counterbore arranged and communicated along the first direction. The aperture of the installation hole is smaller than the aperture of the counterbore.

[0008] According to the mounting beam of the embodiment of the present utility model, the bushing is connected to each of the top plate and the bottom plate in the beam body. The bushing forms a mounting hole and a countersunk hole that are arranged in sequence from top to bottom and communicate with each other, and the aperture of the mounting hole is smaller than that of the countersunk hole. The screw part of the threaded part sequentially passes through the countersunk hole and the mounting hole along the first direction and is in threaded cooperation with the nut on the vehicle body to realize the installation of the battery pack on the vehicle body. The first direction can also be set as the height direction, and the first surface of the bottom plate is the lower surface of the bottom plate. At this time, the head of the threaded part is hidden in the countersunk hole, and the bushing is higher than the first surface of the bottom plate, so that the head of the threaded part will not be exposed below the beam body, thereby effectively improving the appearance beauty of the vehicle at the mounting beam and effectively avoiding the probability of the head of the threaded part colliding with other components. At the same time, the bushing is connected to each of the top plate and the bottom plate in the beam body, so that the top plate and the bottom plate of the beam body jointly realize the bearing of the battery pack, thereby effectively ensuring the installation reliability of the battery pack on the vehicle body.

[0009] In some embodiments, the bushing includes a first cylinder section and a second cylinder section arranged along the first direction. The first cylinder section surrounds and forms the mounting hole, and the second cylinder section surrounds and forms the countersunk hole;

[0010] A first through hole is provided on the top plate. The first cylinder section is partially arranged in the first through hole, or the first cylinder section is located on the side of the top plate close to the bottom plate;

[0011] A second through hole is provided on the bottom plate. The second cylinder section is partially arranged in the second through hole, or the second cylinder section is located on the side of the bottom plate close to the top plate.

[0012] In some embodiments, the aperture of the first through hole is smaller than that of the second through hole. The outer contour of the cross section of the first cylinder section matches the outer contour of the cross section of the first through hole, and the outer contour of the cross section of the second cylinder section matches the outer contour of the cross section of the second through hole.

[0013] In some embodiments, the beam body includes a mounting part and a collapsible part arranged along the second direction. The second direction is perpendicular to the first direction. The collapsible part is connected to the outer peripheral side of the frame. The mounting part defines a first chamber, the collapsible part defines a second chamber and a third chamber. The second chamber is arranged between the first chamber and the third chamber. At least part of the second chamber gradually decreases in size in the first direction towards the direction away from the mounting part, and at least part of the third chamber gradually increases in size in the first direction towards the direction away from the mounting part.

[0014] In some embodiments, the area of ​​the cross-sectional outer contour of the first chamber is Q1, the area of ​​the cross-sectional outer contour of the second chamber is Q2, and the area of ​​the cross-sectional outer contour of the third chamber is Q3, wherein 1≤Q1 / Q2≤1.2; 1.6≤Q2 / Q3≤2.

[0015] In some embodiments, the cross-sectional outer contour of the first chamber is a rectangle, the cross-sectional outer contour of the second chamber is a pentagon, and the cross-sectional outer contour of the third chamber is a triangle.

[0016] In some embodiments, the mounting portion and the collapse portion are integrally roll-formed;

[0017] The first chamber and the second chamber are both closed chambers, and the third chamber is a V-shaped chamber with an opening on one side away from the mounting portion.

[0018] According to an embodiment of the utility model, the battery lower box comprises a frame, a bottom guard plate and a mounting beam as described in any of the above embodiments, wherein the frame is connected to the bottom guard plate, and the frame is connected to the beam body.

[0019] The technical advantages of the battery lower box according to the embodiment of the utility model are the same as the technical advantages of the mounting beam in the above-mentioned embodiment, which will not be repeated here.

[0020] In some embodiments, a lower surface of the bottom plate of the beam body is higher than a lower surface of each of the frame and the bottom guard plate.

[0021] The battery pack according to the embodiment of the present invention includes the battery lower box as described in the above embodiment.

[0022] The technical advantages of the battery pack according to the embodiment of the utility model are the same as the technical advantages of the battery lower box of the above-mentioned embodiment, which will not be repeated here.

[0023] A vehicle according to an embodiment of the present invention includes a battery pack as described in the above embodiment.

[0024] The technical advantages of the vehicle according to the embodiment of the utility model are the same as the technical advantages of the battery pack in the above-mentioned embodiment, which will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of a mounting beam and a frame according to an embodiment of the utility model.

[0026] Figure 2 It is a side view of a mounting beam and a frame according to an embodiment of the utility model.

[0027] Figure 3 It is an exploded view of a mounting beam according to an embodiment of the utility model.

[0028] Figure 4 Explosion view of the mounting beam and the threaded part according to an embodiment of the present utility model.

[0029] Figure 5 Assembly schematic diagram of the mounting beam, the threaded part and the frame according to an embodiment of the present utility model.

[0030] Figure 6 Cross-sectional view of the mounting beam, the threaded part and the frame at the threaded part according to an embodiment of the present utility model.

[0031] Reference numerals:

[0032] 1. Beam body; 11. Mounting part; 111. First chamber; 112. Top plate; 1121. First through hole; 113. Bottom plate; 1131. Second through hole; 12. Collapsible part; 121. Second chamber; 122. Third chamber; 2. Bushing; 21. Mounting hole; 22. Countersunk hole; 23. First cylindrical section; 24. Second cylindrical section; 3. Frame; 4. Threaded part. Detailed implementation manners

[0033] The embodiments of the present utility model will be described in detail below. The examples of the embodiments are shown in the drawings. The embodiments described below with reference to the drawings are exemplary and are intended to explain the present utility model and should not be construed as a limitation to the present utility model.

[0034] The following will be combined with Figures 1-6 Describe the mounting beam according to an embodiment of the present utility model.

[0035] The mounting beam according to an embodiment of the present utility model includes a beam body 1 and a bushing 2. The beam body 1 includes a top plate 112 and a bottom plate 113 arranged at intervals along a first direction. The bottom plate 113 has a first surface opposite to the top plate 112. The bushing 2 is connected to each of the top plate 112 and the bottom plate 113. The bushing 2 is located on the side where the first surface of the bottom plate 113 faces the top plate 112. The bushing 2 is formed with a mounting hole 21 and a countersunk hole 22 arranged and communicated along the first direction. The aperture of the mounting hole 21 is smaller than the aperture of the countersunk hole 22. Wherein, the mounting hole 21 is adapted for the screw part of the threaded part 4 to pass through, and the countersunk hole 22 is adapted for the head of the threaded part 4 to be accommodated.

[0036] According to the mounting beam of the embodiment of the present utility model, the bushing 2 is connected to each of the top plate 112 and the bottom plate 113 in the beam body 1. The bushing 2 forms a mounting hole 21 and a counterbore 22 which are arranged in sequence from top to bottom and communicated with each other, and the aperture of the mounting hole 21 is smaller than that of the counterbore 22. The screw rod portion of the threaded member 4 sequentially passes through the counterbore 22 and the mounting hole 21 along the first direction and is in threaded cooperation with the nut on the vehicle body to realize the installation of the battery pack on the vehicle body. The first direction can be set as the height direction, and the first surface of the bottom plate 113 is the lower surface of the bottom plate 113. At this time, the head of the threaded member 4 is hidden in the counterbore 22, and the bushing 2 is higher than the first surface of the bottom plate 113, so that the head of the threaded member 4 will not be exposed below the beam body 1, thereby effectively improving the appearance beauty of the vehicle at the mounting beam and effectively avoiding the probability of the head of the threaded member 4 colliding with other components. At the same time, the bushing 2 is connected to each of the top plate 112 and the bottom plate 113 in the beam body 1, so that the top plate 112 and the bottom plate 113 of the beam body 1 jointly realize the bearing of the battery pack, thereby effectively ensuring the installation reliability of the battery pack on the vehicle body.

[0037] It should be noted that the first direction is the up-and-down direction of the mounting beam, the second direction is the width direction of the mounting beam, the top plate 112 and the bottom plate 113 are both flat plates perpendicular to the first direction, and the two are connected to the outer peripheral side of the frame 3. There is a stepped surface between the mounting hole 21 and the counterbore 22 in the bushing 2. The threaded member 4 is a bolt. After the screw rod portion of the bolt passes through the mounting hole 21 and is threadedly connected to the nut on the vehicle body, the head of the bolt abuts against the stepped surface, and the head of the bolt is completely accommodated in the counterbore 22. Among them, the counterbore 22 is preferably a round hole, and the bolt is an internal hexagonal bolt. At this time, in order to further ensure the bearing reliability of the beam body 1 on the battery pack, an intermediate plate connected to the frame 3 can also be provided between the top plate 112 and the bottom plate 113, and the bushing 2 is connected to the intermediate plate. At this time, the gravity of the battery pack can be shared by the top plate 112, the bottom plate 113 and the intermediate plate on the beam body 1, and the three are less likely to be bent and deformed relative to the frame 3.

[0038] In some embodiments, such as Figure 3 and Figure 4 shown, the bushing 2 includes a first cylinder section 23 and a second cylinder section 24 arranged along the first direction. The first cylinder section 23 surrounds and forms the mounting hole 21, and the second cylinder section 24 surrounds and forms the counterbore 22. A first through hole 1121 is provided on the top plate 112, and a part of the first cylinder section 23 is arranged in the first through hole 1121, or the first cylinder section 23 is located on the side of the top plate 112 close to the bottom plate 113. A second through hole 1131 is provided on the bottom plate 113, and a part of the second cylinder section 24 is arranged in the second through hole 1131, or the second cylinder section 24 is located on the side of the bottom plate 113 close to the top plate 112.

[0039] Through the cooperation of the first cylinder section 23 and the first through hole 1121, and through the cooperation of the second cylinder section 24 and the second through hole 1131, part of the bushing 2 is arranged between the top plate 112 and the bottom plate 113, avoiding the risk of the bushing 2 colliding with external components when located outside the beam body 1. Moreover, this setting effectively increases the contact area between the bushing 2 and each of the top plate 112 and the bottom plate 113. Combining with the radial limit of the bushing 2 by the first through hole 1121 and the second through hole 1131, the connection strength between the bushing 2 and each of the top plate 112 and the bottom plate 113 is further improved.

[0040] Specifically, as Figure 6 shown, the first cylinder section 23 is fitted in the first through hole 1121 and partially protrudes from the upper surface of the top plate 112, and the second cylinder section 24 passes through the second through hole 1131 from bottom to top and is located above the bottom plate 113.

[0041] In some embodiments, as Figures 2-6 shown, the aperture of the first through hole 1121 is smaller than the aperture of the second through hole 1131, the outer contour of the cross section of the first cylinder section 23 matches the outer contour of the cross section of the first through hole 1121, and the outer contour of the cross section of the second cylinder section 24 matches the outer contour of the cross section of the second through hole 1131.

[0042] On the basis that the diameter of the first through hole 1121 is smaller than the diameter of the second through hole 1131, by setting the outer diameter of the first cylinder section 23 to be smaller than the outer diameter of the second cylinder section 24, while ensuring that the wall thickness of each position of the bushing 2 meets the structural strength, the weight of the bushing 2 is effectively reduced, thereby meeting the requirements of lightweight and cost reduction of the battery pack.

[0043] Specifically, the axial dimension of the second cylinder section 24 is greater than or equal to the axial dimension of the head of the bolt, so that the head of the bolt can be completely accommodated in the counterbore 22, and the axial dimension of the first cylinder section 23 is generally equal to the axial dimension of the second cylinder section 24.

[0044] Alternatively, while part of the first cylinder section 23 is fitted in the first through hole 1121, part of the second cylinder section 24 can also be fitted in the second through hole 1131.

[0045] In some embodiments, the first cylinder section 23 is welded to the top plate 112, and the second cylinder section 24 is welded to the bottom plate 113. That is, the bushing 2 is welded to each of the top plate 112 and the bottom plate 113. Compared with other connection methods, the connection strength between the bushing 2 and each of the top plate 112 and the bottom plate 113 is higher.

[0046] In some embodiments, as Figure 4 and Figure 6As shown in the figure, the beam body 1 includes a mounting portion 11 and a collapsible portion 12 arranged in the second direction. The second direction is perpendicular to the first direction. The collapsible portion 12 is connected to the outer peripheral side of the frame 3. The mounting portion 11 defines a first chamber 111, and the collapsible portion 12 defines a second chamber 121 and a third chamber 122. The second chamber 121 is disposed between the first chamber 111 and the third chamber 122. The size of at least a part of the second chamber 121 in the first direction gradually decreases in the direction away from the mounting portion 11, and the size of at least a part of the third chamber 122 in the first direction gradually increases in the direction away from the mounting portion 11.

[0047] At this time, the collapsible portion 12 includes at least two diagonal ribs angled with respect to the second direction, and there are always two diagonal ribs extending obliquely upward and obliquely downward respectively in the direction away from the mounting portion 11. Thus, when the beam body 1 is impacted from the second direction, under the support of the diagonal ribs, the collapsible portion 12 is less likely to warp upward or downward relative to the frame 3, and further improves the lateral collision protection ability of the battery pack.

[0048] Specifically, as Figure 2 shown, the collapsible portion 12 includes a lower diagonal rib that forms a part of the inner wall surface of the second chamber 121 and extends obliquely upward in the direction away from the mounting portion 11. The collapsible portion 12 further includes an upper diagonal rib that forms a part of the inner wall surface of the third chamber 122 and extends obliquely upward in the direction away from the mounting portion 11. The collapsible portion 12 further includes a middle diagonal rib that separates the second chamber 121 and the third chamber 122 and extends obliquely downward in the direction away from the mounting portion 11.

[0049] In some embodiments, the area of the outer contour of the cross-section of the first chamber 111 is Q1, the area of the outer contour of the cross-section of the second chamber 121 is Q2, and the area of the outer contour of the cross-section of the third chamber 122 is Q3. Among them, 1 ≤ Q1 / Q2 ≤ 1.2, 1.6 ≤ Q2 / Q3 ≤ 2.

[0050] The design that the area of the outer contour of the cross-section of the second chamber 121 is greater than or equal to the area of the outer contour of the cross-section of the first chamber 111 and less than or equal to the area of the outer contour of the cross-section of the third chamber 122 ensures that the collapsible portion 12 has a larger volume and weight relative to the mounting portion 11, and can have a sufficient deformation margin when subjected to a lateral collision, so that the mounting beam has better lateral collision protection ability and better energy absorption effect. At the same time, the design that the ratio of the area of the outer contour of the cross-section of the first chamber 111 to the area of the outer contour of the cross-section of the second chamber 121 does not exceed 1.2, and the ratio of the area of the outer contour of the cross-section of the second chamber 121 to the area of the outer contour of the cross-section of the third chamber 122 does not exceed 2, avoids the excessive volume of the second chamber 121 and the third chamber 122 resulting in excessive weight of the collapsible portion 12, further meeting the vehicle lightweight requirements.

[0051] Specifically, the ratio of the area of the outer contour of the cross-section of the first chamber 111 to the area of the outer contour of the cross-section of the second chamber 121 can be 1, 1.1, and 1.2. The ratio of the area of the outer contour of the cross-section of the second chamber 121 to the area of the outer contour of the cross-section of the third chamber 122 can be 1.6, 1.8, and 2.

[0052] In some embodiments, as Figure 2 and Figure 6 shown, the outer contour of the cross-section of the first chamber 111 is a rectangle, the outer contour of the cross-section of the second chamber 121 is a pentagon, and the outer contour of the cross-section of the third chamber 122 is a triangle.

[0053] The outer contour of the cross-section of the first chamber 111 is a rectangle, which means that the top plate 112 and the bottom plate 113 constituting the mounting part 11 are parallel to each other, and the top plate 112 and the bottom plate 113 are connected by two parallel vertical ribs. The two vertical ribs effectively ensure the support reliability of the mounting part 11 in the first direction. The outer contour of the cross-section of the second chamber 121 is a pentagon, which means that the part of the crush section 12 forming the second chamber 121 includes at least one inclined rib angled with the second direction. The outer contour of the cross-section of the third chamber 122 is a triangle, which means that the part of the crush section 12 forming the third chamber 122 includes at least two inclined ribs angled with the second direction. When the mounting beam is laterally collided, the inclined ribs are more likely to be deformed and bent compared to the horizontal ribs parallel to the second direction to achieve the crush energy absorption effect of the crush section 12. In addition, the crush section 12 forms two chambers, namely the second chamber 121 and the third chamber 122, so that the crush section 12 can form three force transmission paths, thereby making the impact on the ribs corresponding to each force transmission path smaller and the degree of deformation smaller, and further increasing the structural strength of the crush section 12.

[0054] Specifically, as Figure 6 shown, the second chamber 121 is located below the third chamber 122. Among the five ribs in the crush section 12 that define the second chamber 121, two ribs are vertical ribs parallel to the first direction, one rib is a horizontal rib perpendicular to the first direction, and the remaining two ribs are inclined ribs angled with the first direction and the second direction. Among the three ribs in the crush section 12 that define the third chamber 122, one rib is a vertical rib parallel to the first direction, and the remaining two ribs are inclined ribs angled with the first direction and the second direction. Among them, the second chamber 121 and the third chamber 122 share an inclined rib.

[0055] In some embodiments, the mounting part 11 and the crush section 12 are integrally roll-formed. That is, the mounting beam is roll-formed from a steel plate into the mounting part 11 and the crush section 12, thereby forming fewer solder joints, and further increasing the structural strength of the mounting beam and reducing the manufacturing cost.

[0056] The first chamber 111 and the second chamber 121 are both closed chambers, and the third chamber 122 is a V-shaped chamber with an opening on one side away from the mounting portion 11 .

[0057] On the basis of integral roll forming of the mounting portion 11 and the collapsing portion 12, the mounting portion 11 further includes a left plate and a right plate surrounding the formed first cavity 111, and both the left plate and the right plate are connected between the top plate 112 and the bottom plate 113, further ensuring the bearing strength of the mounting portion 11. At the same time, due to the opening of the third cavity 122, the collapsing portion 12 does not need to be provided with a side plate for closing the third cavity 122, further reducing the weight of the collapsing portion 12 and further meeting the lightweight requirements of the vehicle.

[0058] Specifically, an end of the upper oblique rib of the collapse portion 12 away from the mounting portion 11 is also provided with a vertical plate extending along the first direction, and the vertical plate is used to fit and weld to the outer side surface of the frame 3. This arrangement avoids the end of the upper oblique rib being directly welded to the frame 3, thereby preventing the upper oblique rib from penetrating the frame 3 and damaging the battery module inside the battery pack when the battery pack is subjected to a side collision.

[0059] According to the embodiment of the utility model, the battery lower box includes a frame 3, a bottom guard plate and a mounting beam as in any of the above embodiments, the frame 3 is connected to the bottom guard plate, and the frame 3 is connected to the beam body 1.

[0060] The technical advantages of the battery lower box according to the embodiment of the utility model are the same as the technical advantages of the mounting beam in the above-mentioned embodiment, which will not be repeated here.

[0061] In some embodiments, Figure 2 and Figure 6 As shown, the lower surface of the bottom plate 113 of the beam body 1 is higher than the lower surface of each of the frame 3 and the bottom guard plate.

[0062] Therefore, when the battery pack is supported by the tooling so that the beam body 1 of the mounting beam abuts against the bottom of the vehicle body, the upper surface of the tooling will contact the beam body 1 of the mounting beam instead of the bottom guard plate, thereby not compressing the bottom guard plate with relatively poor strength, thereby effectively reducing the risk of deformation of the bottom guard plate and causing deformation of the liquid cooling plate and the battery cell module, and effectively ensuring the installation reliability of the battery pack on the vehicle body.

[0063] The battery pack according to the embodiment of the utility model includes the battery lower box as described in the above embodiment.

[0064] The technical advantages of the battery pack according to the embodiment of the utility model are the same as the technical advantages of the battery lower box of the above-mentioned embodiment, which will not be repeated here.

[0065] A vehicle according to an embodiment of the present invention includes a battery pack as described in the above embodiment.

[0066] The technical advantages of the vehicle according to the embodiments of the present utility model are the same as those of the battery pack in the above embodiments, and will not be described herein again.

[0067] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present utility model.

[0068] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present utility model, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise specifically defined.

[0069] In the present utility model, unless otherwise clearly specified and defined, the terms "mounted", "connected", "connected to", "fixed" and other terms should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection, an electrical connection or communication with each other; it may be directly connected, or indirectly connected through an intermediate medium, and may be the internal communication of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0070] In the present utility model, unless otherwise clearly specified and defined, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "below" and "beneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0071] In the present utility model, terms such as "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0072] Although the above embodiments have been shown and described, it can be understood that the above embodiments are exemplary and should not be construed as limitations on the present utility model. Any changes, modifications, substitutions, and variations made by those of ordinary skill in the art to the above embodiments are within the protection scope of the present utility model.

Claims

1. A mounting beam, characterized in that: include: A beam body, the beam body comprising a top plate and a bottom plate arranged at intervals along a first direction, the bottom plate having a first surface opposite to the top plate; A bushing is connected to each of the top plate and the bottom plate, the bushing is located on the side of the first surface of the bottom plate facing the top plate, the bushing is formed with a mounting hole and a countersunk hole arranged and connected along a first direction, and the aperture of the mounting hole is smaller than the aperture of the countersunk hole.

2. The mounting beam according to claim 1, characterized in that: The bushing comprises a first barrel section and a second barrel section arranged in a first direction, the first barrel section surrounding the mounting hole, and the second barrel section surrounding the countersunk hole; The top plate is provided with a first through hole, and the first barrel section is partially arranged in the first through hole, or the first barrel section is located on a side of the top plate close to the bottom plate; The bottom plate is provided with a second through hole, and the second barrel section is partially disposed in the second through hole, or the second barrel section is located on a side of the bottom plate close to the top plate.

3. The mounting beam according to claim 2, characterized in that: The aperture of the first via hole is smaller than that of the second via hole, the cross-sectional outer contour of the first barrel section matches the cross-sectional outer contour of the first via hole, and the cross-sectional outer contour of the second barrel section matches the cross-sectional outer contour of the second via hole.

4. The mounting beam according to claim 1, characterized in that: The beam body includes a mounting portion and a collapsed portion arranged along a second direction, the second direction is perpendicular to the first direction, the collapsed portion is connected to the outer peripheral side of the frame, the mounting portion defines a first chamber, the collapsed portion defines a second chamber and a third chamber, the second chamber is arranged between the first chamber and the third chamber, at least part of the second chamber has a size in the first direction that gradually decreases in a direction away from the mounting portion, and at least part of the third chamber has a size in the first direction that gradually increases in a direction away from the mounting portion.

5. The mounting beam according to claim 4, characterized in that: The area of ​​the outer contour of the cross section of the first chamber is Q1, the area of ​​the outer contour of the cross section of the second chamber is Q2, and the area of ​​the outer contour of the cross section of the third chamber is Q3, wherein 1≤Q1 / Q2≤1.2; 1.6≤Q2 / Q3≤2.

6. The mounting beam according to claim 4, characterized in that: The cross-sectional outer contour of the first chamber is a rectangle, the cross-sectional outer contour of the second chamber is a pentagon, and the cross-sectional outer contour of the third chamber is a triangle.

7. The mounting beam according to claim 4, characterized in that: The mounting portion and the collapsing portion are integrally roll-formed; The first chamber and the second chamber are both closed chambers, and the third chamber is a V-shaped chamber with an opening on one side away from the mounting portion.

8. A battery lower box, comprising a frame, a bottom guard plate and a mounting beam as claimed in any one of claims 1 to 7, wherein the frame is connected to the bottom guard plate, and the frame is connected to the beam body.

9. The battery lower box according to claim 8, characterized in that: The lower surface of the bottom plate of the beam body is higher than the lower surface of each of the frame and the bottom guard plate.

10. A battery pack, characterized in that: Comprising a battery lower box according to claim 8 or 9.

11. A vehicle, characterized in that: Comprising the battery pack according to claim 10.

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