Battery pack box body, battery pack and vehicle

Abstract

The invention discloses a battery pack box body, a battery pack and a vehicle, the battery pack box body comprises an edge beam, the bottom surface of the edge beam is provided with at least one first groove part recessed along the thickness direction, and the bottom wall of the first groove part is provided with a limiting hole penetrating along the thickness direction; the sleeve assembly is contained in the first groove part and connected with the inner wall of the first groove part, at least part of the sleeve assembly is arranged in the limiting hole in a penetrating mode and extends out of the top face of the edge beam, and a second groove part which is arranged in a sunken mode in the thickness direction is formed in the bottom face of the sleeve assembly. And a mounting hole penetrating in the thickness direction is formed in the bottom wall of the second groove part. According to the battery pack box body provided by the embodiment of the invention, the stress on the sleeve assembly can be dispersed, the structural strength of the sleeve assembly is improved, and the risk of failure is reduced.

Description

Technical Field

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

[0002] In the related art, the mounting point sleeve is one of the important parts for connecting the battery pack to the whole vehicle. It supports, reinforces and reduces wear on the side beam. The structure and processing technology of the sleeve are crucial to the safety and stability of the connection point. The existing mounting sleeve is usually formed of a flange and a sleeve in one piece, and is assembled to the side beam from above by welding or gluing with the flange surface as the connection surface. However, the existing mounting sleeve will continue to be subjected to vibration and impact during the driving of the vehicle. Since the structural strength of the connection between the mounting point and the side beam is insufficient, and the main stress concentration is borne by the side beam mounting point, this can easily lead to stress concentration at the connection, which in turn causes cracking or collapse, and ultimately causes the mounting point structure to fail, affecting the reliability of the connection between the battery pack and the whole vehicle. Summary of the Invention

[0003] The present application aims to solve at least one of the technical problems existing in the prior art. To this end, one purpose of the present application is to provide a battery pack case that can disperse the stress on the sleeve assembly, improve the structural strength of the sleeve assembly, and reduce the risk of failure.

[0004] The present application also proposes a battery pack having the above-mentioned battery pack case.

[0005] The present application also proposes a vehicle having the above-mentioned battery pack.

[0006] According to an embodiment of the present application, the battery pack case includes: a side beam, the bottom surface of the side beam is formed with at least one first groove portion recessed along the thickness direction, and the bottom wall of the first groove portion is formed with a limiting hole extending through the thickness direction; a sleeve assembly, the sleeve assembly is accommodated in the first groove portion and connected to the inner wall of the first groove portion, at least a portion of the sleeve assembly is passed through the limiting hole and extends out of the top surface of the side beam, the bottom surface of the sleeve assembly is formed with a second groove portion recessed along the thickness direction, and the bottom wall of the second groove portion is formed with a mounting hole extending through the thickness direction.

[0007] According to the battery pack case of an embodiment of the present application, the battery pack case may include a side beam and a sleeve assembly. The bottom surface of the side beam may be formed with a first groove portion, the sleeve assembly may be accommodated in the first groove portion and connected to the inner wall of the first groove portion, and the bottom wall of the sleeve assembly may be formed with a second groove portion for assembly. After the side beam is assembled with the vehicle body, the stress borne by the sleeve assembly can be dispersed to the side beam, thereby reducing the force at the connection between the sleeve assembly and the side beam, improving the structural strength of the sleeve assembly, and reducing the risk of failure.

[0008] In some embodiments of the present application, the sleeve assembly includes: a main body portion, which is accommodated in the first groove portion and connected to the inner wall of the first groove portion, the second groove portion is formed on one side of the main body portion along the thickness direction, and the main body portion is formed with a through hole that passes through the thickness direction and is connected to the second groove portion; an extension portion, which is arranged on the other side of the main body portion along the thickness direction and is passed through the limiting hole, and the extension portion is formed with the mounting hole arranged corresponding to the through hole.

[0009] In some embodiments of the present application, at least a portion of the inner wall of the first groove portion is formed with a first arcuate surface, and at least a portion of the outer peripheral wall of the main body portion is formed with a second arcuate surface corresponding to the first arcuate surface.

[0010] In some embodiments of the present application, a side wall is formed on one side of the side beam along the width direction, and the first groove portion is open toward the side wall; the second groove portion is open toward the side wall, and the main body portion is coplanar with the side wall on one side facing the side wall.

[0011] In some embodiments of the present application, the outer wall of the main body is bonded and fixed to the inner wall of the first groove portion, and the outer peripheral wall of the extension portion is bonded and fixed to the inner peripheral wall of the limiting hole.

[0012] In some embodiments of the present application, the battery pack case further includes: a fastener, the fastener is passed through the mounting hole, and the fastener abuts against the bottom wall of the second groove portion.

[0013] In some embodiments of the present application, the extension portion is configured as a hollow cylinder, and the wall thickness of the extension portion is d and satisfies: 3mm≤d≤6mm.

[0014] In some embodiments of the present application, the shortest distance between the free end of the extension portion and the top surface of the side beam is L and satisfies: 3mm≤L≤6mm.

[0015] The battery pack according to an embodiment of the present application is described below.

[0016] According to the embodiment of the present application, the battery pack is provided with the battery pack case of the above-mentioned embodiment. Since the battery pack of the embodiment of the present application is provided with the battery pack case of the above-mentioned embodiment, the battery pack case of the battery pack may have a side beam and a sleeve assembly. The bottom surface of the side beam may be formed with a first groove portion. The sleeve assembly may be accommodated in the first groove portion and connected to the inner wall of the first groove portion. The bottom wall of the sleeve assembly may be formed with a second groove portion for assembly. After the side beam is assembled with the vehicle body, the stress borne by the sleeve assembly may be dispersed to the side beam, thereby reducing the force at the connection between the sleeve assembly and the side beam, improving the structural strength of the sleeve assembly, and reducing the risk of failure.

[0017] The following describes a vehicle according to an embodiment of the present application.

[0018] According to the embodiment of the present application, the vehicle is provided with the battery pack of the above embodiment. Since the vehicle of the embodiment of the present application is provided with the battery pack of the above embodiment, the battery pack of the vehicle has a battery pack case. The battery pack case may include a side beam and a sleeve assembly. The bottom surface of the side beam may be formed with a first groove portion. The sleeve assembly may be accommodated in the first groove portion and connected to the inner wall of the first groove portion. The bottom wall of the sleeve assembly may be formed with a second groove portion for assembly. After the side beam is assembled with the vehicle body, the stress borne by the sleeve assembly can be dispersed to the side beam, thereby reducing the force at the connection between the sleeve assembly and the side beam, improving the structural strength of the sleeve assembly, and reducing the risk of failure.

[0019] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become obvious from the description below, or will be learned through practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0021] Figure 1 is a partial structural schematic diagram of a battery pack case according to an embodiment of the present application;

[0022] Figure 2 yes Figure 1 A schematic structural diagram of the middle sleeve assembly;

[0023] Figure 3 yes Figure 2 Schematic top view of

[0024] Figure 4 yes Figure 3 Schematic diagram of the cross section of AA;

[0025] Figure 5 yes Figure 3 Schematic diagram of the cross section of the BB.

[0026] Reference numerals:

[0027] 10. Battery pack box;

[0028] 11. side beam; 111. side wall; 12. sleeve assembly;

[0029] 121, main body; 1211, second groove; 1212, through hole; 1213, second arc-shaped surface;

[0030] 122. Extension portion; 1221. Mounting hole. DETAILED DESCRIPTION

[0031] The following describes in detail embodiments of the present application. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application and are not to be construed as limiting the present application.

[0032] Reference below Figure 1-Figure 5 The battery pack case 10 according to an embodiment of the present application is described. The battery pack case 10 includes: a side beam 11 and a sleeve assembly 12 .

[0033] The bottom surface of the side beam 11 is formed with at least one first groove portion recessed along the thickness direction, and the bottom wall of the first groove portion is formed with a limiting hole extending through the thickness direction. The sleeve assembly 12 is received in the first groove portion and connected to the inner wall of the first groove portion. At least a portion of the sleeve assembly 12 is inserted into the limiting hole and extends out of the top surface of the side beam 11. The bottom surface of the sleeve assembly 12 is formed with a second groove portion 1211 recessed along the thickness direction, and the bottom wall of the second groove portion 1211 is formed with a mounting hole 1221 extending through the thickness direction.

[0034] At present, the mounting point sleeve is one of the important parts for connecting the battery pack to the whole vehicle. It supports, reinforces and reduces wear on the side beam. The structure and processing technology of the sleeve are crucial to the safety and stability of the connection point. The existing mounting sleeve is usually formed of a flange and a sleeve in one piece, and is assembled to the side beam from above by welding or gluing with the flange surface as the connection surface. However, the existing mounting sleeve is constantly subjected to vibration and impact during vehicle driving. Since the structural strength of the connection between the mounting point and the side beam is insufficient, and the main stress concentration is borne by the side beam mounting point, this can easily lead to stress concentration at the connection, which in turn causes cracking or collapse, and ultimately causes the mounting point structure to fail, affecting the reliability of the connection between the battery pack and the whole vehicle.

[0035] In this regard, an embodiment of the present application proposes a battery pack case 10, which can disperse the stress on the sleeve assembly 12, improve the structural strength of the sleeve assembly 12, and reduce the risk of failure.

[0036] Specifically, the battery pack case 10 may include a side beam 11 and a sleeve assembly 12. The bottom surface of the side beam 11 may be formed with a first groove portion, and the first groove portion may be recessed toward the side beam 11 along the thickness direction. It should be noted that the thickness direction may be the thickness direction of the side beam 11, and the bottom surface of the side beam 11 may be the side of the side beam 11 facing the bottom of the vehicle in its thickness direction. The bottom surface of the first groove portion may be formed with a limiting hole, and the limiting hole may be provided through the thickness direction. The sleeve assembly 12 may be received inside the first groove portion, and the sleeve assembly 12 may be connected to the inner wall of the first groove portion. Optionally, the sleeve assembly 12 and the inner wall of the first groove portion may be directly bonded and fixed via a contact surface, or the sleeve assembly 12 and the first groove portion may be detachably connected via screws or bolts, or the sleeve assembly 12 and the first groove portion may be detachably connected via snap-fit ​​or plug-in.

[0037] Furthermore, at least a portion of the sleeve assembly 12 can be inserted into the limiting hole, and at least a portion of the sleeve assembly 12 can extend out of the top surface of the side beam 11. It can be understood that by extending at least a portion of the sleeve assembly 12 out of the top surface of the side beam 11, it is convenient to limit the position with the vehicle body, which is beneficial for the fastener to be connected to the vehicle body through the sleeve assembly 12. The bottom surface of the sleeve assembly 12 can be formed with a second groove portion 1211, and the second groove portion 1211 can be recessed in the thickness direction, and the bottom wall of the second groove portion 1211 can be formed with a mounting hole 1221 that is penetrated in the thickness direction. By providing the mounting hole 122 1 can facilitate the connection of fasteners, and the second groove portion 1211 can also provide a certain space for the installation of fasteners to avoid the fasteners occupying too much space or interfering with other parts. It can be understood that after the sleeve assembly 12 is assembled with the vehicle body, due to the connection between the sleeve assembly 12 and a portion of the inner wall of the first groove portion, the stress on the sleeve assembly 12 can be dispersed to the side beam 11, that is, most of the stress originally borne by the mounting point is dispersed and absorbed, reducing the force on the sleeve assembly 12, preventing the connection between the sleeve assembly 12 and the side beam 11 from cracking or collapse due to stress concentration, thereby reducing the risk of mounting point failure.

[0038] In short, the battery pack case 10 of the embodiment of the present application may include a side beam 11 and a sleeve assembly 12. The bottom surface of the side beam 11 may be formed with a first groove portion, and the sleeve assembly 12 may be accommodated in the first groove portion and connected to the inner wall of the first groove portion. The bottom wall of the sleeve assembly 12 may be formed with a second groove portion 1211 for assembly. After the side beam 11 is assembled with the vehicle body, the stress borne by the sleeve assembly 12 can be dispersed to the side beam 11, thereby reducing the force at the connection between the sleeve assembly 12 and the side beam 11, improving the structural strength of the sleeve assembly 12, and reducing the risk of failure.

[0039] like Figure 2-Figure 5 As shown, in some embodiments of the present application, the sleeve assembly 12 may include a main body portion 121 and an extension portion 122. The main body portion 121 may be accommodated inside the first groove portion, and the main body portion 121 may be connected to the inner wall of the first groove portion. Optionally, the main body portion 121 and the inner wall of the first groove portion may be directly bonded and fixed through a contact surface, or the main body portion 121 and the first groove portion may be detachably connected by screws or bolts, or the main body portion 121 and the first groove portion may be detachably connected by snapping or plugging. A second groove portion 1211 may be formed on one side of the main body 121 along the thickness direction, and the main body 121 may be formed with a through hole 1212 that passes through the thickness direction and is connected to the second groove portion 1211. The extension portion 122 may be arranged on the other side of the main body 121 along the thickness direction, and the extension portion 122 may be passed through the limiting hole. The extension portion 122 may be formed with a mounting hole 1221 corresponding to the through hole 1212. It can be understood that after the sleeve assembly 12 is assembled with the vehicle body, the stress on the sleeve assembly 12 as a whole can be dispersed to the side beam 11 through the main body 121, thereby reducing the force at the connection between the extension portion 122 and the side beam 11. In a specific embodiment, the main body 121 and the extension portion 122 can be integrally formed by a CNC machine, which is convenient for processing and manufacturing, and can also make the main body 121 and the extension portion 122 firmly connected.

[0040] like Figure 2 As shown, in some embodiments of the present application, at least part of the inner wall of the first groove portion can be formed with a first curved surface, and at least part of the outer peripheral wall of the main body portion 121 can be formed with a second curved surface 1213. The second curved surface 1213 can be arranged corresponding to and connected to the first curved surface. Specifically, the side of the first groove portion away from the outer wall of the side beam 11 can be formed with a first curved surface, and the side of the main body portion 121 away from the outer wall of the side beam 11 can be formed with a second curved surface 1213. By providing the first curved surface and the second curved surface 1213, the rotational displacement of the main body portion 121 and the first groove portion can be avoided after they are matched, thereby reducing the processing difficulty and improving the assembly efficiency.

[0041] like Figure 1 As shown, in some embodiments of the present application, a side wall 111 can be formed on one side of the side beam 11 along the width direction, the first groove portion can be openly arranged toward the side wall 111, the second groove portion 1211 can also be openly arranged toward the side wall 111, and the side of the main body portion 121 facing the side wall 111 can be coplanar with the side wall 111. This arrangement can facilitate assembly and processing of the first groove portion, thereby improving equipment and processing efficiency.

[0042] In some embodiments of the present application, the outer wall of the main body 121 and the inner wall of the first groove portion can be bonded and fixed, and the outer peripheral wall of the extension portion 122 and the inner peripheral wall of the limiting hole can be bonded. Optionally, the outer wall of the main body 121 and the inner wall of the first groove portion can be bonded by structural adhesive, and the outer peripheral wall of the extension portion 122 and the inner peripheral wall of the limiting hole can be bonded by structural adhesive. Bonding and fixing can improve equipment efficiency, reduce the number of parts, reduce structural complexity, and facilitate processing.

[0043] In some embodiments of the present application, the battery pack case 10 may include a fastener, which may be passed through the mounting hole 1221 and abutted against the bottom wall of the second groove portion 1211. In some embodiments, the fastener may be constructed as a bolt, which may be passed through the mounting hole 1221 and fixed to the vehicle body, thereby achieving the installation of the battery pack case 10. The head of the bolt may abut against the bottom wall of the second groove portion 1211, so that the main body 121 can withstand pressure, and the main body 121 can disperse the stress it withstands to the side beam 11, thereby reducing the risk of failure.

[0044] like Figure 4 and Figure 5 As shown, in some embodiments of the present application, the extension portion 122 can be constructed as a hollow cylinder, and the wall thickness of the extension portion 122 can be d, satisfying the relationship: 3mm≤d≤6mm, that is, the wall thickness of the extension portion 122 can be any value between 3mm and 6mm. For example, the wall thickness of the extension portion 122 can be but not limited to 3mm, 4mm, 5mm, 6mm, etc. This arrangement ensures that the structural strength of the extension portion 122 meets the mounting requirements, avoids the risk of cracking or collapse of the extension portion 122, and improves the reliability of the battery pack case 10.

[0045] In some embodiments of the present application, the shortest distance between the free end of the extension portion 122 and the top surface of the side beam 11 is L, satisfying the relationship: 3mm≤L≤6mm, that is, the shortest distance between the free end of the extension portion 122 and the top surface of the side beam 11 can be any value between 3mm and 6mm. For example, the shortest distance between the free end of the extension portion 122 and the top surface of the side beam 11 can be but not limited to 3mm, 4mm, 5mm, 6mm, etc. This arrangement facilitates the connection of the sleeve assembly 12 with the mounting point of the entire vehicle, thereby improving equipment efficiency.

[0046] In a specific embodiment of the present application, in response to the high load requirements of large-size battery packs for commercial vehicles, the extension portion 122 is made of forged 6061-T6 aluminum alloy and processed through multiple steps. The outer diameter of the extension portion 122 is proportionally enlarged according to the size of the side beam 11, and the outer diameter of the extension portion 122 is increased to Φ45±0.03mm. The wall thickness of the extension portion 122 is 6mm, and the outer diameter of the main body 121 is simultaneously expanded to Φ50mm. The thickness of the main body 121 is 5mm, and the depth of the second groove portion 1211 is deepened to 6mm to match the thickened side beam 11. An axial oil guide groove is added to the inner wall of the extension portion 122. The width of the oil guide groove is 2mm and the depth is 0.8mm. The oil guide groove can cooperate with the embedded copper sleeve of the side beam 11 to realize automatic filling of grease, reduce friction loss under dynamic load, and use high-strength epoxy glue (Huntsman Araldite 2015), a spiral adhesive layer is coated on the outer wall of the extension part 122, the pitch of the spiral adhesive layer is 8mm, and an annular adhesive pad is pre-installed at the main body 121. The Shore hardness of the annular adhesive pad is 70D. It is pressed with a pressure of 50kN by hydraulic pressing equipment. After curing, the shear strength reaches 25MPa, which meets the dynamic load-bearing requirements of a 10-ton battery pack.

[0047] In a specific embodiment of the present application, in response to the lightweight demand of passenger cars, the extension portion 122 adopts titanium alloy TC4 precision casting and CNC finishing process, the extension portion 122 is designed to be thinned as a whole, the wall thickness of the extension portion 122 is 3.5mm, the outer diameter of the extension portion 122 is Φ28±0.01mm, the thickness of the main body 121 is 2.8mm, the interference at the upper end of the second groove portion 1211 is adjusted to 0.3mm to adapt to the thin-walled side beam 11, the top end of the sleeve of the extension portion 122 is integrated with an anti-misinstallation structure, and an asymmetric positioning key is provided. The offset angle of the positioning key is 15°, the height of the positioning key is 1.5mm, and the positioning key forms a unique assembly angle with the frame mounting hole 1221. The sleeve assembly 12 and the side beam 11 are assembled with light-curing acrylic glue (DELO Katiobond 4592), and the interior of the extension portion 122 is irradiated by ultraviolet light-guiding fiber. The wavelength of light is 365nm and the intensity of light is 1200mW / cm 2 , achieving positioning and curing within 30 seconds, the thickness of the glue layer is controlled at 0.2-0.5mm, the overall weight is reduced by 40% while maintaining 8kN axial tensile strength.

[0048] In a specific embodiment of the present application, for low-temperature environments of -40°C, the extension 122 adopts a bimetallic composite structure. The outer layer is austenitic stainless steel 316L (2mm thick) to provide antifreeze corrosion protection, with a thickness of 2mm. The inner layer is aluminum alloy 6063 to ensure thermal conductivity, with a thickness of 3mm. Metallurgical bonding is achieved through explosive welding. The main body 121 is designed as a stepped double-groove structure with a main groove depth of 4mm and a secondary groove depth of 2mm. During assembly, the main groove is filled with polyurethane sealant (Sika 265) and the secondary groove is injected with low-temperature silicone grease (Dow Corning 33) to form a double sealing barrier. The outer wall of the extension 122 is processed with annular thermal fins with a fin height of 1.2mm and a spacing of 5mm. In conjunction with the battery pack thermal management system, dimensional stability is achieved under operating conditions of -40°C to 80°C (CTE difference compensation ≤ 0.05mm).

[0049] The battery pack according to an embodiment of the present application is described below.

[0050] According to the embodiment of the present application, the battery pack is provided with the battery pack case 10 of the above-mentioned embodiment. Since the battery pack of the embodiment of the present application is provided with the battery pack case 10 of the above-mentioned embodiment, the battery pack case 10 of the battery pack may have a side beam 11 and a sleeve assembly 12. The bottom surface of the side beam 11 may be formed with a first groove portion. The sleeve assembly 12 may be accommodated in the first groove portion and connected to the inner wall of the first groove portion. The bottom wall of the sleeve assembly 12 may be formed with a second groove portion 1211 for assembly. After the side beam 11 is assembled with the vehicle body, the stress borne by the sleeve assembly 12 may be dispersed to the side beam 11, thereby reducing the force at the connection between the sleeve assembly 12 and the side beam 11, improving the structural strength of the sleeve assembly 12, and reducing the risk of failure.

[0051] The following describes a vehicle according to an embodiment of the present application.

[0052] According to the embodiment of the present application, the vehicle is provided with the battery pack of the above embodiment. Since the vehicle of the embodiment of the present application is provided with the battery pack of the above embodiment, the battery pack of the vehicle has a battery pack case 10. The battery pack case 10 may include a side beam 11 and a sleeve assembly 12. The bottom surface of the side beam 11 may be formed with a first groove portion. The sleeve assembly 12 may be accommodated in the first groove portion and connected to the inner wall of the first groove portion. The bottom wall of the sleeve assembly 12 may be formed with a second groove portion 1211 for assembly. After the side beam 11 is assembled with the vehicle body, the stress borne by the sleeve assembly 12 can be dispersed to the side beam 11, thereby reducing the force at the connection between the sleeve assembly 12 and the side beam 11, improving the structural strength of the sleeve assembly 12, and reducing the risk of failure.

[0053] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply 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 understood as a limitation on the present application.

[0054] In the description of this application, "first feature" and "second feature" may include one or more of the features.

[0055] In the description of this application, “plurality” means two or more.

[0056] In the description of the present application, a first feature being “on” or “under” a second feature may include the first and second features being in direct contact with each other, or the first and second features being in contact with each other not directly but via another feature therebetween.

[0057] In the description of this application, a first feature “on”, “above” and “above” a second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is horizontally higher than the second feature.

[0058] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0059] Although the embodiments of the present application have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions, and variations may be made to the embodiments without departing from the principles and intent of the present application, and that the scope of the present application is defined by the claims and their equivalents.

Claims

1. A battery pack box, characterized in that: include: A side beam, wherein the bottom surface of the side beam is formed with at least one first groove portion recessed along the thickness direction, and the bottom wall of the first groove portion is formed with a limiting hole penetrating along the thickness direction; A sleeve assembly, wherein the sleeve assembly is accommodated in the first groove portion and connected to the inner wall of the first groove portion, at least a portion of the sleeve assembly is passed through the limiting hole and extends out of the top surface of the side beam, and the bottom surface of the sleeve assembly is formed with a second groove portion recessed along the thickness direction, and the bottom wall of the second groove portion is formed with a mounting hole penetrating along the thickness direction.

2. The battery pack case according to claim 1, characterized in that: The sleeve assembly comprises: a main body portion, the main body portion being received in the first groove portion and connected to an inner wall of the first groove portion, the second groove portion being formed on one side of the main body portion along the thickness direction, and a through hole being formed on the main body portion that passes through the main body portion along the thickness direction and communicates with the second groove portion; An extension portion is provided on the other side of the main body portion along the thickness direction and is passed through the limiting hole. The extension portion is formed with the mounting hole corresponding to the through hole.

3. The battery pack case according to claim 2, characterized in that: At least a portion of the inner wall of the first groove portion is formed with a first arc-shaped surface, and at least a portion of the outer peripheral wall of the main body portion is formed with a second arc-shaped surface corresponding to the first arc-shaped surface.

4. The battery pack case according to claim 3, characterized in that: The side beam is formed with a side wall on one side along the width direction, the first groove portion is open toward the side wall; the second groove portion is open toward the side wall, and the body portion is coplanar with the side wall on one side facing the side wall.

5. The battery pack case according to claim 4, characterized in that: The outer wall of the main body is bonded and fixed to the inner wall of the first groove, and the outer peripheral wall of the extension is bonded and fixed to the inner peripheral wall of the limiting hole.

6. The battery pack case according to claim 2, characterized in that: Also includes: A fastener is passed through the mounting hole and abuts against the bottom wall of the second groove portion.

7. The battery pack case according to claim 2, characterized in that: The extension portion is configured as a hollow cylinder, and the wall thickness of the extension portion is d and satisfies: 3 mm ≤ d ≤ 6 mm.

8. The battery pack case according to claim 2, characterized in that: The shortest distance between the free end of the extension portion and the top surface of the side beam is L and satisfies: 3mm≤L≤6mm.

9. A battery pack, characterized in that: Comprising a battery pack case as described in any one of claims 1-8.

10. A vehicle, characterized in that: Comprising the battery pack as claimed in claim 9.

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