Battery box body and battery pack

Abstract

The utility model relates to the technical field of battery box bodies, and discloses a battery box body and a battery pack, which comprise a box body frame, a cross beam and a reinforcing structure, the box body frame comprises a bottom structure and an annular frame; the annular frame comprises two side frames which are oppositely arranged, and a front frame and a rear frame which are positioned between the two side frames, and the front frame and the rear frame are oppositely arranged; the cross beam is positioned between the front frame and the rear frame, and two ends are respectively connected with the two side frames; a containing cavity is defined by the cross beam, the rear frame and the two side frames. The reinforcing structure is located at the included angle between the cross beam and the side frame and comprises a first side face and a second side face, the first side face is connected with the cross beam, and the second side face is connected with the side frame; a receding part is arranged between the first side face and the second side face, and the receding part is arranged on the side, close to the side frame, of the first side face. The avoiding part can prevent the reinforcing structure from interfering with a welding bead or a connecting piece at the joint of the cross beam and the side frame.

Description

Technical Field

[0001] The utility model relates to the technical field of battery boxes, in particular to a battery box and a battery pack. Background Art

[0002] In the traditional integration method in a battery pack, first, battery cells are assembled into modules, and then the modules are fixed in the battery box using bolts. Since these modules are accompanied by many components such as end plates, side plates, and straps, not only is the structure complex, but it also occupies the internal space of the battery box, directly resulting in a low energy density of the battery pack and an increase in manufacturing costs. In order to improve the integration and endurance of the battery pack and reduce costs at the same time, the industry is actively promoting the comprehensive simplification of the battery pack structure.

[0003] By streamlining redundant components such as the front and rear end plates, side plates, straps, and fasteners for fixing modules in the battery pack, the lightweight and high-efficiency design of the battery pack is achieved. However, this change also brings new challenges: the expansion force generated during the charge and discharge process of the simplified battery pack is directly borne by the battery box frame, and the strength of the connections of the box frame is relatively low, and it is easy to be damaged when facing a large expansion force, affecting the safety and durability of the battery box. Summary of the Utility Model

[0004] In view of this, the utility model provides a battery box and a battery pack to solve the problem that the strength of the connection of the box frame is relatively low, and it is easy to be damaged when facing a large expansion force, affecting the safety and durability of the battery box.

[0005] In a first aspect, the utility model provides a battery box, including a box frame, a cross beam, and a strengthening structure; the box frame includes a bottom structure and an annular frame; the annular frame is fixed on the bottom structure; the annular frame includes two relatively arranged side frames, and a front frame and a rear frame located between the two side frames, and the front frame and the rear frame are relatively arranged; the cross beam is located between the front frame and the rear frame, and both ends are respectively connected to the two side frames; the cross beam, the rear frame, and the two side frames enclose a placement cavity; the strengthening structure is located at the angle between the cross beam and the side frame, the strengthening structure includes a first side surface and a second side surface, the first side surface is connected to the cross beam, and the second side surface is connected to the side frame; and there is also an avoidance part between the first side surface and the second side surface, and the avoidance part is arranged on the side of the first side surface close to the side frame.

[0006] Beneficial effects: Since the cross beam, the rear frame and the two side frames enclose a placement cavity, the battery pack can be arranged between the cross beam and the rear frame. Therefore, the cross beam, the rear frame and the two side frames simultaneously bear the expansion force generated during the charging and discharging process of the battery pack. By providing a strengthening structure at the angle between the cross beam structure and the side frame, the connection strength between the cross beam structure and the side frame can be enhanced, and the ability of the box frame to bear the expansion force can be improved. And because the strengthening structure is provided with an avoidance part, and the avoidance part is arranged at the angle between the cross beam and the side frame, it can avoid interference between the strengthening structure and the weld bead or connecting piece at the connection of the cross beam and the side frame, improving the smoothness and stability of the installation of the strengthening structure. This not only simplifies the installation process, reduces the assembly difficulty caused by interference, but also ensures that the strengthening structure can be tightly and unobstructedly integrated into the overall structure, contributing to the improvement of the overall strength and stability of the battery box structure.

[0007] In an alternative embodiment, the strengthening structure further includes two arc-shaped connecting surfaces. One arc-shaped connecting surface is arranged between the avoidance part and the first side surface, and the other arc-shaped connecting surface is arranged between the avoidance part and the second side surface.

[0008] Beneficial effects: Through the arrangement of the arc-shaped connecting surfaces, the stress concentrated on the strengthening structure is dispersed, effectively avoiding the phenomenon of stress concentration. This not only improves the stress-bearing capacity of the strengthening structure, enhances the overall ability of the strengthening structure to bear the expansion force, but also ensures the stability and durability of the strengthening structure in a complex stress environment.

[0009] In an alternative embodiment, the strengthening structure further includes a first reinforcing part, which is arranged on the side of the first side surface away from the side frame and is arranged opposite to the avoidance part; both sides of the first reinforcing part are connected to the first side surface and the second side surface respectively.

[0010] Beneficial effects: By connecting both sides of the first reinforcing part to the first side surface and the second side surface respectively, not only the stability of the overall structure of the strengthening structure is enhanced, but also the strengthening structure has better anti-deformation ability, can bear more external loads, and realizes the improvement of the strength of the strengthening structure.

[0011] In an alternative embodiment, the first side surface, the second side surface, the avoidance part and the first reinforcing part enclose a cavity structure.

[0012] Beneficial effects: By enclosing the first side surface, the second side surface, the avoidance part and the first reinforcing part to form a cavity structure, that is, the inside of the strengthening structure is a cavity structure, which helps to reduce the overall weight of the strengthening structure, and thus reduces the overall weight of the battery box structure.

[0013] In an alternative embodiment, there is an arc transition between two adjacent inner sidewalls of the cavity structure.

[0014] Beneficial effects: By providing an arc transition between two adjacent inner sidewalls of the cavity structure, smooth boundary connection can be achieved, stress concentration can be reduced, and the overall strength of the reinforcement structure can be improved.

[0015] In an alternative embodiment, the reinforcement structure further includes a second reinforcement portion, and both ends of the first side surface and the second side surface in the height direction of the reinforcement structure are connected to the second reinforcement portion.

[0016] Beneficial effects: By providing the second reinforcement portion, not only the stability of the overall structure of the reinforcement structure is enhanced, but also the reinforcement structure has better anti-deformation ability, can withstand more external loads, and realizes the improvement of the strength of the reinforcement structure.

[0017] In an alternative embodiment, there are a plurality of the second reinforcement portions, and the plurality of second reinforcement portions are arranged at intervals in the height direction of the reinforcement structure.

[0018] Beneficial effects: By providing a plurality of second reinforcement portions, the overall stability of the reinforcement structure can be further enhanced, the anti-deformation ability of the reinforcement structure can be improved, it can withstand more external loads, and the strength of the reinforcement structure is further improved.

[0019] In an alternative embodiment, a first mounting hole is provided on the first side surface; the first side surface is connected to the cross beam through the first mounting hole.

[0020] Beneficial effects: By providing the first mounting hole on the first side surface, it is convenient to connect the reinforcement structure and the cross beam through fasteners such as screws, which helps to achieve a detachable connection between the reinforcement structure and the cross beam and improves the disassembly and assembly efficiency of the reinforcement structure.

[0021] In an alternative embodiment, a second mounting hole is provided on the second side surface, and the second side surface is connected to the side frame through the second mounting hole.

[0022] Beneficial effects: By providing the second mounting hole on the second side surface, it is convenient to connect the reinforcement structure and the side frame through fasteners such as screws, which helps to achieve a detachable connection between the reinforcement structure and the side frame and improves the disassembly and assembly efficiency of the reinforcement structure.

[0023] In an alternative embodiment, the side frame has a protruding end protruding from the rear frame along the length extension direction, and the reinforcement structure is provided at the angle between the protruding end and the rear frame.

[0024] Beneficial effects: By providing a strengthening structure at the angle between the protruding end and the rear frame, it helps to improve the connection strength between the rear frame and the side frames, further enhancing the ability of the battery box frame to withstand expansion forces, enabling the battery box frame to withstand more expansion forces; and since the strengthening structure is provided on the side where the protruding end is located, that is, the strengthening structure is on the side of the rear frame away from the battery pack, it avoids occupying the placement cavity for the battery pack, allowing more batteries to be placed between the cross beam and the rear frame.

[0025] In a second aspect, the present utility model also provides a battery pack, including a battery pack and the above-mentioned battery box body, and the battery pack is arranged in the placement cavity.

[0026] Since the battery pack includes the above-mentioned battery box body and has the same effects as the above-mentioned battery box body, it will not be elaborated here. Description of the Drawings

[0027] In order to more clearly illustrate the specific embodiments of the present utility model or the technical solutions in the related art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the related art. Obviously, the following drawings are some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0028] Figure 1 It is a schematic diagram of the overall structure of a battery box body according to an embodiment of the present utility model;

[0029] Figure 2 It is a schematic diagram of the internal structure of the battery box body according to an embodiment of the present utility model;

[0030] Figure 3 It is a schematic diagram of the structure of a strengthening structure connected to a cross beam according to an embodiment of the present utility model;

[0031] Figure 4 It is a schematic diagram of the structure of a strengthening structure connected to a rear frame according to an embodiment of the present utility model;

[0032] Figure 5 It is a schematic diagram of the structure of a strengthening structure according to an embodiment of the present utility model;

[0033] Figure 6 It is a schematic diagram of another angle of the structure of a strengthening structure according to an embodiment of the present utility model;

[0034] Figure 7 It is a schematic diagram of the structure of another strengthening structure connected to a cross beam according to an embodiment of the present utility model;

[0035] Figure 8Schematic diagram of the connection structure between another reinforcement structure and the rear frame according to an embodiment of the present utility model;

[0036] Figure 9 Schematic diagram of another reinforcement structure according to an embodiment of the present utility model;

[0037] Figure 10 Schematic diagram of another angle of another reinforcement structure according to an embodiment of the present utility model.

[0038] Explanation of reference numerals:

[0039] 1. Box body frame; 11. Bottom structure; 12. Ring-shaped frame; 121. Side frame; 1211. Protruding end; 122. Front frame; 123. Rear frame; 13. Cover plate; 2. Cross beam; 3. Battery pack; 4. Reinforcement structure; 41. First side; 411. First mounting hole; 42. Second side; 421. Second mounting hole; 43. Avoidance part; 44. Arc-shaped connecting surface; 45. First reinforcement part; 46. Second reinforcement part. Detailed implementation manners

[0040] To make the objectives, technical solutions, and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are some, but not all, of the embodiments of the present utility model. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0041] The following combines Figures 1 to 10 , and describes the embodiments of the present utility model.

[0042] According to an embodiment of the present invention, on the one hand, a battery box body is provided, which includes a box body frame 1, a cross beam 2 and a strengthening structure 4; the box body frame 1 includes a bottom structure 11 and an annular frame 12; the annular frame 12 is fixed on the bottom structure 11; the annular frame 12 includes two opposite side frames 121, and a front frame 122 and a rear frame 123 located between the two side frames 121, and the front frame 122 and the rear frame 123 are oppositely arranged; the cross beam 2 is located between the front frame 122 and the rear frame 123, and both ends are respectively connected to the two side frames 121; the cross beam 2, the rear frame 123 and the two side frames 121 enclose a placement cavity; the strengthening structure 4 is located at the included angle between the cross beam 2 and the side frame 121, and the strengthening structure 4 includes a first side surface 41 and a second side surface 42, the first side surface 41 is connected to the cross beam 2, and the second side surface 42 is connected to the side frame 121; and an avoidance part 43 is further provided between the first side surface 41 and the second side surface 42, and the avoidance part 43 is arranged on the side of the first side surface 41 close to the side frame 121.

[0043] Among them, the included angle between the first side surface 41 and the second side surface 42 of the strengthening structure 4 can be adaptively adjusted according to the included angle between the cross beam 2 and the side frame 121, and the embodiments of the present application do not limit this, for example, when the cross beam 2 and the side frame 121 are arranged perpendicular to each other, the first side surface 41 and the second side surface 42 are perpendicular to each other.

[0044] Since the cross beam 2, the rear frame 123 and the two side frames 121 enclose a placement cavity, the battery pack 3 can be arranged between the cross beam 2 and the rear frame 123. Therefore, the cross beam 2, the rear frame 123 and the two side frames 121 simultaneously bear the expansion force generated by the battery pack 3 during charging and discharging. By arranging the strengthening structure 4 at the included angle between the cross beam 2 structure and the side frame 121, the connection strength between the cross beam 2 structure and the side frame 121 can be enhanced, and the ability of the box body frame 1 to bear the expansion force can be improved; and since the avoidance part 43 is provided on the strengthening structure 4, and the avoidance part 43 is arranged at the included angle between the cross beam 2 and the side frame 121, it can avoid interference between the welding beads or connecting parts at the connection of the strengthening structure 4 with the cross beam 2 and the side frame 121, improving the smoothness and stability of the installation of the strengthening structure 4. It not only simplifies the installation process, reduces the assembly difficulty caused by interference, but also ensures that the strengthening structure 4 can be tightly and unobstructedly integrated into the overall structure, contributing to the improvement of the overall strength and stability of the battery box body structure.

[0045] In a specific embodiment, the battery pack further includes a high-voltage connector, a battery management system and an information collection wire harness.

[0046] In a specific embodiment, the battery pack 3 is composed of a plurality of battery cells stacked in the battery thickness direction. There are a plurality of battery packs 3, and the plurality of battery packs 3 are arranged in parallel and are sequentially arranged in the placement cavity along the length direction of the battery.

[0047] Specifically, as Figure 1 shown, the thickness direction of the battery is the first direction; the length direction of the battery is the second direction.

[0048] In a specific embodiment, the two end portions of the cross beam 2 are respectively connected to the opposite inner side surfaces of the two side frames 121. The connection method between the cross beam 2 and the side frame 121 is welding, riveting or connection by fasteners; the two end portions of the rear frame 123 are respectively connected to the opposite inner side surfaces of the two side frames 121. The connection method between the rear frame 123 and the side frame 121 is welding, riveting or connection by fasteners.

[0049] In a specific embodiment, the first side surface 41 is connected to the side surface of the cross beam 2, and the second side surface 42 is connected to the inner side surface of the side frame 121.

[0050] Specifically, the cross beam 2 is connected to four strengthening structures 4. The four strengthening structures 4 are respectively arranged at both ends of the cross beam 2. One strengthening structure 4 is provided on one side close to the placement cavity at each end, and one strengthening structure 4 is provided on the side far from the placement cavity.

[0051] Preferably, there is a gap between the front frame 122 and the cross beam 2. The strengthening structure 4 is arranged on the side of the cross beam 2 away from the battery pack 3, avoiding the occupation of the placement cavity for placing the battery pack 3 by the strengthening structure 4, so that more batteries can be placed between the cross beam 2 and the rear frame 123.

[0052] Specifically, the avoidance portion 43 is a chamfer or an arc angle.

[0053] In one embodiment, the strengthening structure 4 further includes two arc-shaped connecting surfaces 44. One arc-shaped connecting surface 44 is arranged between the avoidance portion 43 and the first side surface 41, and the other arc-shaped connecting surface 44 is arranged between the avoidance portion 43 and the second side surface 42.

[0054] Through the arrangement of the arc-shaped connecting surface 44, the stress concentrated on the strengthening structure 4 is dispersed, thereby effectively avoiding the phenomenon of stress concentration. It not only improves the stress bearing capacity of the strengthening structure 4, enhances the overall ability of the strengthening structure 4 to withstand the expansion force, but also ensures the stability and durability of the strengthening structure 4 in a complex stress environment.

[0055] In one embodiment, the reinforcing structure 4 further includes a first reinforcing portion 45, which is disposed on a side of the first side surface 41 away from the side frame 121 and is disposed opposite to the avoiding portion 43; both sides of the first reinforcing portion 45 are respectively connected to the first side surface 41 and the second side surface 42.

[0056] By connecting both sides of the first reinforcing portion 45 to the first side surface 41 and the second side surface 42 respectively, not only the stability of the overall structure of the reinforcing structure 4 is enhanced, but also the reinforcing structure 4 has better anti-deformation ability, can withstand more external loads, and realizes the improvement of the strength of the reinforcing structure 4.

[0057] In one embodiment, the first side surface 41, the second side surface 42, the avoiding portion 43 and the first reinforcing portion 45 enclose a cavity structure.

[0058] By enclosing the first side surface 41, the second side surface 42, the avoiding portion 43 and the first reinforcing portion 45 to form a cavity structure, that is, the interior of the reinforcing structure 4 is a cavity structure, which helps to reduce the overall weight of the reinforcing structure 4, thereby reducing the overall weight of the battery box body structure.

[0059] In one embodiment, the adjacent two inner side walls of the cavity structure are in arc transition.

[0060] By setting the adjacent two inner side walls of the cavity structure to be in arc transition, smooth boundary connection can be achieved, stress concentration can be reduced, and the overall strength of the reinforcing structure 4 can be improved.

[0061] In one embodiment, the reinforcing structure 4 further includes a second reinforcing portion 46, and both ends of the first side surface 41 and the second side surface 42 in the height direction of the reinforcing structure 4 are connected to the second reinforcing portion 46.

[0062] By providing the second reinforcing portion 46, not only the stability of the overall structure of the reinforcing structure 4 is enhanced, but also the reinforcing structure 4 has better anti-deformation ability, can withstand more external loads, and realizes the improvement of the strength of the reinforcing structure 4.

[0063] Specifically, the height direction of the reinforcing structure 4 is Figure 1 the third direction.

[0064] In one embodiment, there are a plurality of the second reinforcing portions 46, and the plurality of second reinforcing portions 46 are sequentially arranged at intervals in the height direction of the reinforcing structure 4.

[0065] By providing multiple second reinforcement parts 46, the overall stability of the reinforcement structure 4 can be further enhanced, the anti-deformation ability of the reinforcement structure 4 can be improved, and it can withstand more external loads, achieving a further improvement in the strength of the reinforcement structure 4.

[0066] In one implementation manner of this embodiment, the first side surface 41 and the second side surface 42 are connected by the first reinforcement part 45. In another implementation manner of this embodiment, the first side surface 41 and the second side surface 42 are connected by the second reinforcement part 46. In yet another implementation manner of this embodiment, the first side surface 41 and the second side surface 42 are connected by the first reinforcement part 45 and the second reinforcement part 46 simultaneously.

[0067] In one embodiment, a first mounting hole 411 is provided on the first side surface 41; the first side surface 41 is connected to the cross beam 2 through the first mounting hole 411.

[0068] By providing the first mounting hole 411 on the first side surface 41, it is convenient to connect the reinforcement structure 4 and the cross beam 2 through fasteners such as screws, which helps to achieve a detachable connection between the reinforcement structure 4 and the cross beam 2, and improves the disassembly and assembly efficiency of the reinforcement structure 4.

[0069] In one embodiment, a second mounting hole 421 is provided on the second side surface 42, and the second side surface 42 is connected to the side frame 121 through the second mounting hole 421.

[0070] By providing the second mounting hole 421 on the second side surface 42, it is convenient to connect the reinforcement structure 4 and the side frame 121 through fasteners such as screws, which helps to achieve a detachable connection between the reinforcement structure 4 and the side frame 121, and improves the disassembly and assembly efficiency of the reinforcement structure 4.

[0071] Specifically, when the first reinforcement part 45 and the second reinforcement part 46 are not provided on the reinforcement structure 4, or when the first side surface 41 and the second side surface 42 of the reinforcement structure 4 are only connected by the second reinforcement part 46, the side surface of the reinforcement structure 4 opposite to the avoidance part 43 is an open structure, which is convenient for fasteners such as screws to fix and install the reinforcement structure 4 through the first mounting hole 411 or the second mounting hole 421.

[0072] In an alternative implementation manner, the reinforcement structure 4 can also be connected to the cross beam 2 or the box frame 1 by welding.

[0073] In one embodiment, the side frame 121 is provided with a protruding end 1211 protruding from the rear frame 123 along the length extension direction, and the reinforcement structure 4 is provided at the angle between the protruding end 1211 and the rear frame 123.

[0074] By providing a reinforcing structure 4 at the angle between the protruding end 1211 and the rear frame 123, it helps to improve the connection strength between the rear frame 123 and the side frame 121, further enhancing the ability of the box frame 1 to withstand expansion forces, enabling the box frame 1 to withstand more expansion forces; and since the reinforcing structure 4 is provided on the side where the protruding end 1211 is located, that is, the reinforcing structure 4 is on the side of the rear frame 123 away from the battery pack 3, it avoids the occupation of the placement cavity for the battery pack 3 by the reinforcing structure 4, allowing more batteries to be placed between the cross beam 2 and the rear frame 123.

[0075] Specifically, the length extension direction of the side frame 121 is Figure 1 the first direction as shown.

[0076] Specifically, the first side surface 41 of the reinforcing structure 4 is connected to the side surface of the rear frame 123 facing away from the placement cavity, and the second side surface 42 is connected to the inner side surface of the side frame 121.

[0077] Specifically, reinforcing structures 4 are provided at both ends of the rear frame 123.

[0078] In one embodiment, the box frame 1 further includes a cover plate 13, which is disposed on the side of the annular frame 12 away from the bottom structure 11 and is detachably connected to the annular frame 12.

[0079] By detachably connecting the cover plate 13 to the annular frame 12, it facilitates the disassembly and assembly of the cover plate 13, thus helping to improve the installation and maintenance efficiency inside the battery box.

[0080] Specifically, the side of the annular frame 12 away from the bottom structure 11 is a flange surface, and the cover plate 13 is detachably connected to the annular frame 12 through the flange surface.

[0081] In a specific embodiment, the height of the reinforcing structure 4 is less than the height of the annular frame 12, avoiding the end of the reinforcing structure 4 protruding from the annular frame 12, preventing the overall size of the battery box from increasing, making the structure of the battery box more compact and having a higher space utilization rate. And it is also convenient for the fixed connection between the bottom structure 11 and the cover plate 13 and the annular frame 12.

[0082] According to an embodiment of the present invention, on the other hand, a battery pack is also provided, including a battery pack 3 and the above-mentioned battery box, and the battery pack 3 is disposed in the placement cavity.

[0083] Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A battery box body, characterized in that, Comprising: A box body frame (1), including a bottom structure (11) and an annular frame (12); the annular frame (12) is fixed on the bottom structure (11); the annular frame (12) includes two opposite side frames (121), and a front frame (122) and a rear frame (123) located between the two side frames (121), and the front frame (122) and the rear frame (123) are opposite to each other; A cross beam (2), located between the front frame (122) and the rear frame (123), and both ends are respectively connected to the two side frames (121); the cross beam (2) and the rear frame (123) and the two side frames (121) enclose a placement cavity; A strengthening structure (4), located at the angle between the cross beam (2) and the side frame (121), the strengthening structure (4) includes a first side surface (41) and a second side surface (42), the first side surface (41) is connected to the cross beam (2), and the second side surface (42) is connected to the side frame (121); and there is also an avoidance part (43) between the first side surface (41) and the second side surface (42), and the avoidance part (43) is arranged on one side of the first side surface (41) close to the side frame (121).

2. The battery box according to claim 1, characterized in that, The strengthening structure (4) further includes two arc connecting surfaces (44), one arc connecting surface (44) is arranged between the avoidance part (43) and the first side surface (41), and the other arc connecting surface (44) is arranged between the avoidance part (43) and the second side surface (42).

3. The battery box according to claim 1, characterized in that The strengthening structure (4) further includes a first reinforcing part (45), the first reinforcing part (45) is arranged on one side of the first side surface (41) away from the side frame (121), and is opposite to the avoidance part (43); both sides of the first reinforcing part (45) are respectively connected to the first side surface (41) and the second side surface (42).

4. The battery box according to claim 3, characterized in that, The first side surface (41), the second side surface (42), the avoidance part (43) and the first reinforcing part (45) enclose a cavity structure.

5. The battery box according to claim 4, characterized in that, There is an arc transition between two adjacent inner side walls of the cavity structure.

6. The battery box according to any one of claims 1 to 5, characterized in that, The strengthening structure (4) further includes a second reinforcing part (46), and both ends of the first side surface (41) and the second side surface (42) along the height direction of the strengthening structure (4) are connected to the second reinforcing part (46).

7. The battery box according to claim 6, characterized in that, There are multiple second reinforcing parts (46), and the multiple second reinforcing parts (46) are arranged at intervals in sequence along the height direction of the strengthening structure (4).

8. The battery box according to any one of claims 1 to 5 or 7, characterized in that, The first side surface (41) is provided with a first mounting hole (411); the first side surface (41) is connected to the cross beam (2) through the first mounting hole (411); And / or, the second side surface (42) is provided with a second mounting hole (421), and the second side surface (42) is connected to the side frame (121) through the second mounting hole (421).

9. The battery box according to any one of claims 1 to 5 or 7, characterized in that, The side frame (121) is provided with a protruding end (1211) protruding from the rear frame (123) along the length extension direction, and the reinforcing structure (4) is provided at the angle between the protruding end (1211) and the rear frame (123).

10. A battery pack, characterized in that, It includes a battery pack (3) and the battery box described in any one of claims 1-9 above, and the battery pack (3) is arranged in the placement cavity.

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