Battery pack box body

Abstract

The battery pack box comprises a bottom plate, a box shell, a gasket and a fastener, the box shell is provided with a containing space, an opening is formed in one side of the box shell, a skirt edge is arranged on the edge of the opening, a second through hole is formed in the skirt edge, a first reinforcing structure is arranged on the peripheral side of the skirt edge, a first through hole is formed in the edge of the bottom plate, and the gasket is arranged between the skirt edge and the bottom plate; the bottom plate can be elastically deformed when being stressed, the bottom plate covers the opening of the box shell during assembly, and the fastener sequentially penetrates through the first through hole and the second through hole to connect the bottom plate with the box shell and clamp the gasket. According to the box body, due to the fact that the first reinforcing structure is arranged on the peripheral side of the second through hole, the stress strength of the skirt edge is enhanced, flexible buffering and sealing are achieved by clamping the elastic gasket, the problem that the skirt edge is damaged in the fastening process is effectively solved, and the structural connection reliability and the sealing performance are improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a storage device of energy storage module, especially a battery pack box. BACKGROUND

[0002] With the wide application of new energy vehicles, the battery pack as one of its core components undertakes the key function of electric energy storage and output. In order to ensure the safety and reliability of the power battery in the running process, the structural design of the battery pack is paid more and more attention, especially the sealing performance, structural strength and assembly convenience of the battery pack box, which becomes the focus of the industry. The battery pack box is usually used to accommodate core components such as battery cell modules and battery management systems, and is required to have good structural rigidity, protection ability and environmental adaptability to meet the safety operation requirements under different working conditions.

[0003] In the prior art, the battery pack box usually includes a box shell and a bottom plate. The box shell is provided with a containing space for mounting the battery cell module, and an opening is formed on one side to facilitate the packaging of the bottom plate. In order to realize sealing and fixing, a skirt structure is usually arranged on the edge of the opening of the box shell. A gasket is arranged between the skirt and the bottom plate, and then a screw or other fastener is used to install the bottom plate at the opening of the box shell to form an overall closed structure.

[0004] However, since the skirt serves as a connecting edge part, its structural strength is limited. During the tightening of the fastener, the skirt is prone to damage and cracking due to uneven stress or excessive local load, which affects the assembly strength and sealing performance of the box, and may even cause structural failure of the battery pack. Therefore, it is urgent to provide a battery pack box to solve the above problems. SUMMARY

[0005] The utility model aims at providing a battery pack box which sets a reinforcing structure on the periphery of the second through hole of the skirt, and cooperates with the gasket structure capable of elastic deformation, so as to effectively improve the compressive strength and sealing performance of the skirt.

[0006] The utility model solves the above problems by adopting the following technical scheme: a battery pack box comprises:

[0007] A bottom plate is provided with a first through hole at the edge thereof;

[0008] A box shell comprises a containing space, and an opening is formed on one side of the box shell and communicates with the containing space. A skirt is arranged at the edge of the opening, and a second through hole and a first reinforcing structure arranged on the periphery of the second through hole are formed on the skirt.

[0009] A gasket is configured to elastically deform when subjected to external pressure;

[0010] A fastener.

[0011] Wherein, the bottom plate cover is arranged at the opening of the box body after the box body is assembled, the fastener passes through the first through hole and the second through hole, the bottom plate is connected with the box shell, and the gasket is clamped between the skirt and the bottom plate.

[0012] Preferably, the first reinforcing structure comprises:

[0013] A ring-shaped part is arranged on one side of the skirt, and the ring-shaped part is arranged concentrically with the second through hole;

[0014] A first reinforcing rib is arranged on the circumferential side of the ring-shaped part and connected with the skirt.

[0015] Preferably, the number of the first through hole and the second through hole is several, and the circumferential side of each second through hole is provided with the first reinforcing structure;

[0016] The box shell further comprises a plurality of second reinforcing structures, each second reinforcing structure is arranged between two adjacent first reinforcing structures, and only one second reinforcing structure is arranged between two adjacent first reinforcing structures.

[0017] Preferably, the second reinforcing structure is a second reinforcing rib.

[0018] Preferably, the second through hole is configured such that, when the box body is assembled, the orthographic projection contour of the first through hole on the side of the bottom plate facing the box shell is located in the range of the orthographic projection contour of the second through hole on the side of the bottom plate facing the box shell.

[0019] Preferably, the first through hole is an elliptical through hole, the second through hole is a circular through hole, and the radius of the second through hole is equal to or less than the short radius of the first through hole.

[0020] Preferably, the gasket is a ring-shaped structure, and the gasket is configured to extend in the circumferential direction of the edge of the skirt when the box body is assembled.

[0021] Preferably, a third reinforcing rib is arranged at the inner wall of the accommodating space in the box shell.

[0022] Preferably, a slot is arranged in the side of the box body and communicated with the accommodating space.

[0023] Preferably, an avoiding groove is arranged at the edge of the skirt of the box body.

[0024] The beneficial effects of the embodiment in the utility model are as follows:

[0025] The first reinforcing structure is arranged on the side of the second through hole of the skirt of the box shell, the structural strength of the skirt under stress is enhanced, the flexible buffering and sealing functions are realized by clamping the gasket with elastic deformation capacity between the bottom plate and the skirt, the problems of insufficient bearing capacity of the skirt, breakage and cracking during the tightening process of the fastener in the prior art are effectively solved, and the technical effects of improving the structural strength and sealing reliability of the box body connecting area are realized. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 is a schematic structural diagram of a box body in an embodiment of the present application.

[0027] Figure 2 is a schematic explosion diagram of a box body in an embodiment of the present application.

[0028] Figure 3 is a schematic top view of a box body in an embodiment of the present application.

[0029] Figure 4 is a schematic enlarged view of A in the present application. Figure 3

[0030] Wherein: 10, bottom plate; 110, first through hole; 20, box shell; 210, skirt; 220, second through hole; 230, first reinforcing structure; 231, annular part; 232, first reinforcing rib; 240, second reinforcing structure; 250, notch; 260, avoiding groove; 30, gasket. DETAILED DESCRIPTION

[0031] The specific embodiments of the present application will be further described in detail below in combination with the drawings and examples. The following examples are used to illustrate the present application, but not to limit the scope of the present application.

[0032] In the description of the present application, it should be understood that the orientations or positional relationships indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the scope of protection of the present application. In addition, the terms "first", "second" and the like are only for description purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features limited by "first", "second" and the like can explicitly or implicitly include one or more of the features. In the description of the present application, unless otherwise specified, the meaning of "multiple" is two or more.​

[0033] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connecting" should be understood in a broad sense, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through intermediate medium, or the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0034] Please refer to Figures 1-2 A preferred embodiment of the present application provides a battery pack box, which is used for mounting and protecting energy storage modules, such as battery modules. The box comprises a bottom plate 10, a box shell 20, a gasket 30 and a fastener. The edge of the bottom plate 10 is provided with a first through hole 110. The box shell 20 comprises a receiving space. An opening is formed in one side of the box shell 20 and communicates with the receiving space. A skirt 210 is arranged at the edge of the opening. A second through hole 220 and a first reinforcing structure 230 arranged around the second through hole 220 are formed in the skirt 210. The gasket 30 is configured to elastically deform when subjected to external pressure. After the box is assembled, the bottom plate 10 is arranged at the opening of the box. The fastener passes through the first through hole 110 and the second through hole 220, so that the bottom plate 10 is connected with the box shell 20, and the gasket 30 is clamped between the skirt 210 and the bottom plate 10.

[0035] Specifically;

[0036] The present application provides a preferred battery pack box, which is used for mounting and protecting energy storage modules, such as power battery modules. The battery pack box comprises a bottom plate 10, a box shell 20, a gasket 30 and a fastener, and each component cooperates to realize stable packaging and effective sealing of the internal battery module.

[0037] In terms of structure, the box shell 20 forms a receiving space inside for accommodating the battery module. An opening is arranged on one side of the box shell 20 and communicates with the receiving space, facilitating module installation. The edge of the opening is provided with a skirt 210 structure. A plurality of second through holes 220 are uniformly formed in the skirt 210 for fastening connection. In order to improve the stress strength of the skirt 210 structure during assembly, a first reinforcing structure 230 is additionally arranged around the second through hole 220, which can provide additional support for the local area and avoid deformation or cracking due to concentrated stress.

[0038] The bottom plate 10 is sized to match the opening, and a plurality of first through holes 110 are formed at the edge thereof to be aligned with the second through holes 220 on the skirt 210. The gasket 30 is arranged between the bottom plate 10 and the skirt 210, is made of elastic material (such as silicone rubber, fluororubber, etc.), and can be elastically deformed under stress to play a buffering and sealing role. The fastener (such as a screw or a bolt) passes through the first through hole 110 of the bottom plate 10, the gasket 30, and the second through hole 220 of the skirt 210 in sequence, and is connected with the box shell 20 to form a stable fastening state through thread locking.

[0039] In the assembly process, the bottom plate 10 is aligned with the opening of the box shell 20, the gasket 30 is placed between the contact surfaces of the two, and then the fastener is used for perforation and fixation. Through screw tightening, the fastener will exert axial pressure on the bottom plate 10, the gasket 30 and the skirt 210, and the gasket 30 will fill the small gap during stress deformation, thereby forming an effective seal and buffering the concentrated load caused by screw locking. Since the reinforcing structure is arranged at the skirt 210, even under the action of a larger locking force, the structure can be effectively prevented from being damaged, thereby improving the assembly reliability.

[0040] In terms of working principle, the box body realizes the combination of rigid fixation and flexible sealing through the above-mentioned connecting structure during the sealing and packaging of the battery module, not only guarantees the structural strength, but also improves the vibration resistance and air tightness, and is suitable for occasions with high safety and sealing requirements in electric vehicles.

[0041] The battery pack box is suitable for various installation environments, such as electric vehicles, power storage stations and other scenes with strict requirements on the packaging strength and sealing performance of the battery module. The working temperature range can be optimized according to the selected material, such as using a high-temperature-resistant rubber gasket 30 to work in an environment of -40℃ to +125℃ for a long time. The reinforcing structure can also be adjusted according to the material of the box shell 20, such as thickening the rib, surrounding the rib plate, and embedding the metal gasket to realize structural reinforcement.

[0042] Furthermore, the first reinforcing structure 230 can be arranged in a ring shape, a rectangular shape or a radial shape, or an integrated reinforcing rib structure. The gasket 30 can also be single-layered, double-layered or provided with a positioning protrusion structure according to the actual sealing level to further enhance the sealing performance and displacement prevention capability. In addition, the fastener can be a vibration-proof structure such as a lock bolt or a spring washer to improve the impact resistance.

[0043] In summary, the utility model has the following beneficial effects by arranging the reinforcing structure around the second through hole 220 of the skirt 210 and clamping the elastically deformable gasket 30 between the bottom plate 10 and the skirt 210.

[0044] The local bearing capacity of the skirt 210 is effectively enhanced due to the reinforcing structure arranged around the through hole of the skirt 210, and the problem that the skirt 210 is easily damaged during fastening in the prior art is effectively solved, thereby achieving the technical effects of improving the structural strength of the battery pack box and the connection reliability.

[0045] The flexible buffering and gap filling can be achieved during assembly due to the elastic deformation of the gasket 30 clamped between the bottom plate 10 and the skirt 210, the problem of poor sealing and easy loosening of the connection part in the prior art is effectively solved, thereby achieving the technical effects of improving the sealing performance and vibration resistance.

[0046] The problems of complex assembly and inconvenient maintenance in the prior art are effectively solved due to the reasonable structure design and simple assembly mode of each component, thereby achieving the technical effects of improving the assembly efficiency and service life of the battery pack box.

[0047] In some embodiments, as shown in Figures 3-4 The first reinforcing structure 230 includes a ring-shaped part 231 and a first reinforcing rib 232, the ring-shaped part 231 is arranged on one side of the skirt 210, and the ring-shaped part 231 is arranged concentrically with the second through hole 220, and the first reinforcing rib 232 is arranged on the circumferential side of the ring-shaped part 231 and connected with the skirt 210.

[0048] In this embodiment, in order to further enhance the connection strength and stability of the battery pack box during the installation of the bottom plate 10, the first reinforcing structure 230 specifically includes a ring-shaped part 231 and a plurality of first reinforcing ribs 232, which are used to reinforce the stress area of the skirt 210, effectively preventing the skirt 210 from cracking or deforming due to stress concentration caused by tightening of the fastener.

[0049] The ring-shaped part 231 is arranged on the outer side of the skirt 210 (i.e. the side opposite to the contact surface of the skirt 210 and the bottom plate 10), and the geometric center of the ring-shaped part 231 is arranged concentrically with the second through hole 220 on the skirt 210, so that when the fastener applies axial pressure through the second through hole 220, the ring-shaped part 231 can provide uniform distributed support to the hole circumference, thereby dispersing the local load. The shape of the ring-shaped part 231 can be a solid ring or a hollow ring, and the material thereof can be the same as the box shell 20 (such as aluminum alloy, magnesium alloy, etc.), or it can be a high-strength reinforced plastic or embedded metal structure to meet different strength requirements.

[0050] A plurality of first reinforcing ribs 232 are evenly arranged on the circumferential side of the annular member 231 and are connected to the outer wall of the skirt 210 in the radial direction. These reinforcing ribs are integrally formed with the skirt 210, so that the annular member 231 and the skirt 210 form a stable reinforcing framework structure. The number of reinforcing ribs can be determined according to actual application, for example, three, four or six symmetrically arranged, to improve the bending resistance and shear resistance of the overall structure.

[0051] During the assembly operation, when the bottom plate 10 is locked through the first through hole 110 and the second through hole 220 using fasteners, the annular member 231 bears most of the axial load from the fasteners, and the reinforcing ribs provide additional tensile and shear stiffness to prevent stress concentration in a single weak area. This composite structure makes the skirt 210 less likely to deform or break locally during tightening, thereby improving assembly reliability.

[0052] The cross section of the annular member 231 can be trapezoidal, rectangular or other different geometric shapes to enhance its resistance to deformation. The reinforcing ribs can also be hollow or ribbed structures to optimize the balance between weight and strength. The connection method of the reinforcing ribs can also use in-mold injection of metal inserts or laser welding to improve structural integrity.

[0053] In summary, the first reinforcing structure 230 is further described in this embodiment, which has the following beneficial effects:

[0054] Since the annular member 231 is arranged concentrically with the second through hole 220 and surrounded by reinforcing ribs, it can uniformly bear and disperse the load from the fasteners during tightening, effectively solving the problem of uneven stress on the skirt 210 in the prior art, thereby achieving the technical effects of improving assembly stability and structural strength.

[0055] Since the first reinforcing ribs 232 are connected to the skirt 210 to form a support framework structure, the deformation resistance of the skirt 210 is enhanced, effectively solving the problem of structural fatigue caused by long-term load or vibration, thereby achieving the technical effect of prolonging the service life of the box.

[0056] Moreover, since the overall structure is designed reasonably and has strong manufacturing process compatibility, it is convenient for mass production and standardized assembly, reduces manufacturing costs, and improves product consistency and market application breadth.

[0057] Therefore, this reinforcing structure improves the strength and reliability of the battery pack box while taking into account lightweight and production feasibility, and is a reasonable and adaptable technical solution.

[0058] In some embodiments, as Figure 3As shown, the number of the first through holes 110 and the second through holes 220 is several, and the circumferential side of each second through hole 220 is provided with the first reinforcing structure 230. The box shell 20 further comprises a plurality of second reinforcing structures 240, each of which is arranged between two adjacent first reinforcing structures 230, and there is only one second reinforcing structure 240 between two adjacent first reinforcing structures 230, and the second reinforcing structure 240 is a second reinforcing rib.

[0059] In this embodiment, in order to further enhance the structural strength and assembly stability of the skirt 210 of the box shell 20, a plurality of first through holes 110 and second through holes 220 are arranged in the battery pack box, realizing multi-point fastening connection of the bottom plate 10 and the skirt 210 of the box shell 20. Among them, the first through hole 110 is arranged at the edge of the bottom plate 10, and the second through hole 220 is arranged on the skirt 210 of the box shell 20, and the number is the same and one-to-one correspondence, which is convenient for cooperation and fixation by fasteners during installation.

[0060] In order to prevent the local stress concentration of the skirt 210 from causing cracking or damage during the tightening process of the fastener, the circumferential side of each second through hole 220 is provided with a first reinforcing structure 230. The first reinforcing structure 230 generally includes a ring member 231 and a reinforcing rib, which can form a local reinforcing area, and forms a concentric reinforcement around the through hole, so that this area has higher bearing capacity. A plurality of first reinforcing structures 230 are arranged in a spaced distribution along the edge of the skirt 210, providing uniform compression and shear performance support for the overall structure.

[0061] In addition, in order to further improve the overall deformation resistance of the skirt 210, the box shell 20 is further provided with a plurality of second reinforcing structures 240, each of which is a plurality of second reinforcing ribs, and the second reinforcing structure 240 is arranged between two adjacent first reinforcing structures 230, and there is only one second reinforcing structure 240 between every two first reinforcing structures 230, so that the reinforcing structures are alternately distributed along the circumference of the skirt 210. The second reinforcing rib is generally in the form of a strip-shaped extension structure, which is integrally formed with the box shell 20 or fixed by a connecting means, and can improve the overall bending stiffness and fatigue strength of the connection area.

[0062] In the actual assembly process, the bottom plate 10 covers the opening of the box shell 20, the fastener passes through the first through hole 110, the gasket 30 and the second through hole 220 in turn, and is connected with the skirt 210 to form a fastening structure. When the fastener applies an axial load, the first reinforcing structure 230 around the second through hole 220 can effectively disperse the load and prevent the hole edge from deforming or cracking; at the same time, the second reinforcing ribs between the first reinforcing structures 230 further improve the continuity and uniformity of the overall stress of the skirt 210, prevent the "stress island" effect from appearing while being fixed at multiple points, and ensure that the entire skirt 210 has good compression and shock resistance.

[0063] The battery pack box body in the embodiment is suitable for battery pack application scenarios with high requirements for structural rigidity and sealing, especially for new energy vehicles, energy storage power stations, energy equipment in high vibration environments and the like, and can effectively cope with structural fatigue problems caused by vibration, impact or temperature difference changes. The structural part can be made of aluminum alloy, magnesium alloy or high-strength composite material.

[0064] In some other embodiments, the annular part 231 of the first reinforcing structure 230 can adopt different shapes (such as an oval shape, a square frame) and different cross-sectional structures (such as a boss or a groove) to adapt to different space and strength requirements. The number and length of the second reinforcing ribs can be adjusted according to the actual load condition, and the second reinforcing ribs can also be provided with a buffer hole structure to adapt to stress diffusion.

[0065] In summary, the embodiment uniformly sets a plurality of second through holes 220 along the extension direction of the edge of the skirt 210, and additionally sets a second reinforcing structure 240 between two adjacent first reinforcing structures 230, which achieves the following beneficial effects:

[0066] Since the first reinforcing structure 230 is arranged around each of the plurality of second through holes 220, and the second reinforcing rib is arranged between each pair of adjacent first reinforcing structures 230, a composite structure system of point reinforcement and surface reinforcement is formed, which effectively solves the problems of local load concentration and insufficient overall rigidity of the skirt 210 in the prior art, and further improves the assembly stability and structural reliability.

[0067] Since the reinforcing structures are reasonably distributed and cooperate with each other, the stress can be uniformly distributed during multi-point fastening, the structural fatigue can be effectively relieved, the shock and impact resistance can be improved, and the service life of the battery pack box body can be prolonged.

[0068] In addition, since the structure is regularly and symmetrically arranged, mold processing and batch assembly are facilitated, manufacturing costs are reduced, product consistency and production efficiency are improved.

[0069] To facilitate the installation of the bottom plate 10 at the opening of the cabinet shell 20, the fastener can be sequentially inserted through the first through hole 110 and the second through hole 220. In some embodiments, as shown in Figure 4 Further, the first through hole 110 is an elliptical through hole, and the second through hole 220 is a circular through hole. The radius of the second through hole 220 is equal to or less than the minor axis of the first through hole 110.

[0070] In some embodiments, to facilitate the accurate and reliable installation of the bottom plate 10 to the opening of the cabinet shell 20 while ensuring assembly efficiency and structural sealing, the first through hole 110 and the second through hole 220 have mutual alignment design features in spatial projection. Specifically, when the cabinet is assembled, the first through hole 110 on the bottom plate 10 is orthogonally projected along its side facing the cabinet shell 20, and the projection completely falls within the projection range of the second through hole 220 on the skirt 210 in the same direction, thereby ensuring that the fastener can be smoothly inserted through both to achieve assembly positioning and connection.

[0071] Specifically, in terms of structural shape, the first through hole 110 is provided as an elliptical through hole, and its major axis direction can extend along the edge of the bottom plate 10 to accommodate installation deviations due to manufacturing tolerances or thermal expansion and contraction, thereby improving assembly adaptability. The second through hole 220 is a circular through hole to enhance the structural strength and stability of the skirt 210 and avoid stress concentration caused by sharp edges or asymmetric structures. Further, the circular radius of the second through hole 220 is designed to be no greater than the minor axis of the first through hole 110, thereby ensuring assembly alignment while avoiding the locking surface of the fastener from being separated from the effective support area, thereby improving connection reliability.

[0072] In actual assembly process, the installer first aligns the bottom plate 10 with the opening of the cabinet shell 20 and preliminarily aligns the through hole positions of the bottom plate 10 and the skirt 210 by visual inspection or positioning pins. Since the first through hole 110 is elliptical, the fastener has a certain transverse installation tolerance when inserted, so that even if the bottom plate 10 has a slight deviation, the fastener can still be smoothly inserted into the second through hole 220 below, thereby completing the through installation from the bottom plate 10 to the cabinet shell 20. This design significantly simplifies the assembly positioning process and is particularly suitable for use in automated assembly or complex environments.

[0073] The key link in the implementation process of the box in this embodiment is that the elliptical design of the first through hole 110 cooperates with the circular alignment limiting structure of the second through hole 220. On the one hand, the elliptical through hole provides a transverse adjustment margin to adapt to box size, thermal expansion and contraction and other deformations; on the other hand, the second through hole 220 plays a role in hole position limiting and stress balancing, so that the pre-tightening force applied by the fastener is more concentrated and uniform, preventing locking failure or structural damage.

[0074] The box in this embodiment is suitable for use in scenarios that require high sealing performance, high strength connection and structural tolerance challenges, such as new energy vehicle battery pack structure assembly, and is particularly suitable for batch production scenarios where there are matching errors between the box shell 20 and the bottom plate 10.

[0075] In some other embodiments, the first through hole 110 can also be provided in other non-circular hole shapes with tolerance capability, such as oblong holes, special-shaped holes with positioning grooves, etc., to further improve assembly flexibility. The shape of the second through hole 220 can also be appropriately optimized, such as providing a reinforcing edge or using a stepped hole structure, to adapt to different types of fasteners (such as self-tapping screws, rivets or positioning pins). The projection alignment method can also use the "overlap area" principle within a limited range instead of complete containment to adapt to different tolerance settings.

[0076] In summary, by locating the orthographic projection profile of the first through hole 110 on the side of the bottom plate 10 facing the box shell 20 within the orthographic projection profile of the second through hole 220 on the side of the bottom plate 10 facing the box shell 20, the box in this embodiment has the following advantages:

[0077] Since the first through hole 110 is designed as an ellipse and its orthographic projection falls within the projection range of the second through hole 220 when assembly is complete, transverse assembly tolerance is provided, effectively solving the through hole misalignment problem caused by structural size errors or manufacturing tolerances, and thus achieving fast and reliable installation operation.

[0078] Since the second through hole 220 is circular and has a radius not greater than the short radius of the first through hole 110, the local structure of the skirt 210 is enhanced in compression resistance, effectively preventing local stress concentration during the locking process of the fastener, and thus achieving the technical effects of improving structural strength and prolonging connection life.

[0079] This matching structure takes into account positioning tolerance and structural stability, making box assembly easier to automate, suitable for mass production applications with high consistency, and reducing process requirements and manual assembly difficulty.

[0080] In some embodiments, as shown in Figure 2 The gasket 30 is configured to extend in the circumferential direction of the edge of the skirt 210 when the box is assembled.

[0081] In this embodiment, to further improve the sealing performance and structural stability of the battery pack box body, the gasket 30 is designed to extend along the circumferential direction of the edge of the skirt 210. That is, in the completed assembled state of the box body, the gasket 30 is in a closed state, and is arranged around the contact area between the skirt 210 of the box shell 20 and the bottom plate 10, thereby realizing continuous sealing and buffering of the entire opening edge.

[0082] The gasket 30 can be made of high-elastic sealing material, such as silicone rubber, fluororubber, EPDM foam, thermoplastic elastomer, etc., and has good compression deformation resistance and environmental adaptability. The cross-sectional shape can be circular, rectangular, trapezoidal or self-positioning flange structure; the length can be an integral whole structure or a lap joint combined structure, ensuring that the entire skirt 210 edge is covered.

[0083] The gasket 30 extends along the circumferential direction of the edge of the skirt 210, and can be arranged one-to-one corresponding to the plurality of second through holes 220, so that it is pressed at the same time during the locking process of the fastener, forming a multi-point force and multi-point sealing structure. The size matches the contour shape of the skirt 210 of the box shell 20, which is often rectangular or trapezoidal closed curve.

[0084] During assembly, the operator or assembly robot first accurately places the gasket 30 on the pre-set groove or positioning area of the skirt 210, so that it is continuously distributed along the circumference of the skirt 210. Then the bottom plate 10 is covered on the gasket 30, and then the plurality of fasteners pass through the first through hole 110 of the bottom plate 10 and the second through hole 220 of the skirt 210, and are locked point by point.

[0085] During the process of gradually tightening the fastener, the gasket 30 is axially extruded and elastically deformed in the local area, filling the small gap between the skirt 210 and the bottom plate 10, and forming a preliminary seal; and as the assembly process advances, the entire gasket 30 realizes continuous compression and sealing closure, thereby forming a complete, uniform and reliable dustproof and waterproof sealing ring as a whole.

[0086] In this embodiment, the key design point of the gasket 30 is the resilience and compression deformation resistance of the gasket 30 material, which determines the sealing reliability under long-term use, the layout continuity in the circumferential direction and the position matching accuracy, directly affects the sealing consistency of each section of the skirt 210 periphery, whether the matching structure of the bottom plate 10 and the skirt 210 is provided with a positioning groove or a limiting protrusion, and whether the distribution of the assembly accuracy and convenience and the fastening force is uniformly transmitted to the full length of the gasket 30, to ensure that the sealing structure does not fail due to improper local compression.

[0087] In other embodiments, the gasket 30 can be a rectangular closed loop, a trapezoidal closed loop, or an open structure to meet the packaging requirements of different opening shapes. In addition, a special gasket 30 mounting groove can be provided on the skirt 210, or the gasket 30 can be pre-assembled and integrated with the bottom plate 10, and the quick positioning can be achieved by buckling or bonding. Further, the gasket 30 can be combined with a conductive spring for electromagnetic shielding, or embedded with a heat-conducting material for edge heat conduction and buffering.

[0088] In the embodiment, since the gasket 30 extends along the circumferential direction of the edge of the skirt 210, a continuous and uniform sealing contact band is formed after the assembly of the box body, effectively solving the water leakage and dust leakage problems caused by the local arrangement of the sealing element in the prior art, and further achieving a significant improvement in the sealing reliability of the whole box.

[0089] In addition, since the gasket 30 has a flexible buffering function, it plays a role in unloading stress and avoiding damage caused by rigid contact during tightening, thereby improving the fatigue resistance and shock resistance of the structure. The structure also facilitates standardized production and modular assembly, is suitable for various box sizes and opening structures, reduces assembly complexity and error rate, and has excellent engineering feasibility and promotional value.

[0090] In some embodiments, in order to prevent the top of the box body from collapsing due to excessive span, a third reinforcing rib is arranged at the inner wall of the accommodation space in the box shell 20. It should be noted that the top of the box body is arranged opposite to the opening.

[0091] In the embodiment, in order to improve the stability of the overall structure of the box body under long-term use and stress state, especially to prevent the top of the box body from collapsing, deforming or failing due to a large span, a third reinforcing rib is arranged at the inner wall of the accommodation space in the box shell 20. The top of the box body is above the bottom relative to the opening, and plays a role in closing, supporting and protecting the entire box structure.

[0092] The third reinforcing rib is a structural reinforcement unit arranged on the inner wall of the accommodation space in the box shell 20, and the number thereof can be several, arranged along the span direction or longitudinal direction or transverse direction of the top structure. It is usually manufactured in an integrated manner with the box shell 20.

[0093] The cross section of the third reinforcing rib can be T-shaped, I-shaped, rectangular or semicircular rib structure, and the material thereof can be consistent with that of the box shell 20 (such as aluminum alloy, steel plate, composite material, etc.), so as to ensure the consistency of the mechanical properties. The length of the reinforcing rib is determined according to the size of the box span, and usually spans the main stress direction area of the top, forming a support frame or ribbed distribution in structure.

[0094] The third reinforcing rib is attached to or close to the inner surface of the top of the box body and is fixedly connected with the left and right or front and back inner walls. The third reinforcing rib can provide reverse support for the top plate to prevent the top plate from bending inward due to its own weight, negative pressure in the cavity or external load.

[0095] In the actual working state, the top of the box body usually faces the following forces:

[0096] Gravity, especially when the entire box body is placed vertically or the top is covered by other components.

[0097] Pressure generated by internal structural components or modules is transmitted upward.

[0098] Vertical extrusion force caused by stacking from above during transportation.

[0099] Thermal expansion and contraction effect caused by environmental temperature difference, especially when the top area is large.

[0100] Therefore, by arranging the third reinforcing rib at the inner wall, the ribs can disperse the concentrated load of the top plate and conduct it to the side wall of the box body, thereby improving the overall compression and bending resistance and preventing the top plate structure from collapsing or deforming locally due to excessive span. At the same time, this structure does not significantly occupy the internal volume, which is beneficial to maintaining the effective installation space of the module.

[0101] In this embodiment, the key design elements of the third reinforcing rib include:

[0102] The arrangement direction and density of the third reinforcing rib should be optimized in combination with the top span and stress analysis.

[0103] The connection strength of the reinforcing rib and the inner wall should meet the overall force transmission continuity and fatigue life requirements.

[0104] If there is a close relationship with the battery cell module, the surface of the reinforcing rib should be considered for insulation and anti-collision design, such as wrapping non-conductive cushioning material.

[0105] In some other embodiments, the third reinforcing rib can be designed as a penetrating reinforcing rib to connect the opposite inner wall to form a closed force structure, or it can be replaced by a top filling type composite support structure, such as filling foam core material, honeycomb sandwich panel, etc., combined with the third reinforcing rib to enhance the overall stiffness. The reinforcing rib can also be arranged in a cross or grid shape to improve the multi-directional support capability. The reinforcing rib can be designed as a multifunctional structure with wire slots or pipe channels in combination with the module wiring.

[0106] In this embodiment, by arranging the third reinforcing rib on the inner wall of the accommodation space, the bending and compression resistance of the top structure of the box body is effectively improved, the problem of easy collapse of the top due to large span in the prior art is effectively solved, and the technical effects of improving the structural reliability and service life are achieved.

[0107] The third reinforcing rib has a compact structure and flexible layout, does not occupy major installation space, and is suitable for most PACK structure design scenarios, improving structural usability and versatility.

[0108] Furthermore, it has high compatibility in manufacturing methods, and can be manufactured using methods such as die casting, welding, and bonding, which facilitates mass production and standardized design, thereby reducing manufacturing costs.

[0109] Furthermore, in some embodiments, such as Figures 1-2 As shown, in order to facilitate the installation of the controller for the energy storage module inside the control box, a slot 250 communicating with the accommodating space is provided on the side of the box.

[0110] In this embodiment, to facilitate the installation and deployment of controller components for controlling the operation of the battery module, such as the battery management system (BMS) main control board, cable connectors, cooling controllers, or power management units, a slot 250 is provided on the side of the enclosure. This slot 250 communicates with the internal accommodating space to realize the embedding, connection, and signal transmission of the controller, thereby improving the integration and functional expandability of the control components inside the enclosure.

[0111] The slot 250 is located in the middle or edge of the side wall of the housing 20, with its opening facing outwards and structurally connected to the interior of the accommodating space, forming a channel for the controller to enter or exit or for wiring to pass through. The geometry of the slot 250 can be rectangular, stepped, semi-enclosed U-shaped, or inverted T-shaped. The opening size is reserved according to the size of the housing or interface module of the controller to be installed. It is often equipped with edge reinforcing ribs or flanged structures to prevent local structural weakness at the opening.

[0112] The slot 250 is typically integrally formed with the housing body (e.g., through aluminum die casting, injection molding, sheet metal forming, etc.), but it can also be formed through post-processing methods such as drilling, milling, laser cutting, etc. The slot 250 can be designed with sealing structures (e.g., sealing strips, sealing rings) or mounting reinforcements (e.g., mounting brackets, connecting plates) around its perimeter to facilitate the fixing and sealing of the controller.

[0113] During assembly, technicians can first insert the controller or its connecting components from outside the housing into the receiving space through slot 250, and then install it into the preset installation position within slot 250 using mounting screw holes, pins, slide rails, or slot structures. Slot 250 enables electrical connection (such as CAN, UART, power cables) or thermal connection (such as thermocouples, heating elements, etc.) between the controller and the internal energy storage module, thereby achieving real-time acquisition of control signals and issuance of control commands.

[0114] If the controller needs to communicate with external systems (such as data bus or remote monitoring), the interface can be brought out of the enclosure through the slot 250 to enable external power connection or data interface integration, facilitating system-level integration applications.

[0115] The key of the design of the slot 250 in this embodiment is the space matching of the controller installation and the plug-in path. It is necessary to ensure that the size of the slot 250 is compatible with the shape of the controller interface module. In the scene with waterproof or dustproof requirements, the edge of the slot 250 should be equipped with a sealing ring, a waterproof cover plate or a sealing coating. In addition, in order to avoid weakening the structural rigidity of the side wall of the slot 250, a reinforcing rib, an embedded skeleton or an edge flanging structure can also be designed around the slot 250. Moreover, in some scenarios, the controller is an electronic component, and if it generates a large amount of heat, a heat dissipation channel, an aluminum heat sink or a thermal interface material can be combined with the position of the slot 250.

[0116] In other embodiments, a plurality of slots 250 can be provided, corresponding to different functional modules (main controller, thermal controller, fuse box, etc.) for distributed installation. The shape of the slot 250 can be changed, such as using an "L-shaped, Z-shaped" embedded guide channel structure to improve the safety of controller installation. The controller can also use magnetic, buckle or sliding rail type quick installation methods to improve maintenance efficiency.

[0117] The embodiment achieves the following effects by providing the slot 250 on the side of the box:

[0118] Since the slot 250 that communicates with the accommodation space is provided on the side of the box, the controller can be directly inserted and installed from the side, effectively solving the problems of inconvenient assembly, inconvenient maintenance and complex wiring of the controller in the prior art, and thereby realizing the structural optimization of the controller and the module connection.

[0119] Moreover, by providing a closed and controllable slot 250 structure, the sealing, anti-vibration and protection requirements can be met, and the environmental adaptability of the system can be improved.

[0120] Therefore, the scheme supports modularization and external interface integration, is suitable for diversified control schemes and system integration requirements, and has good engineering universality and expansibility.

[0121] In some embodiments, as shown in Figure 3 Since the box will finally be installed in a product (such as an electric vehicle), in order to avoid interference with the structure in the product, a relief groove 260 is provided at the edge of the skirt 210 of the box.

[0122] In this embodiment, considering that the battery pack box body is usually required to be installed in a more complex whole machine product (such as an electric vehicle chassis, an energy storage cabinet, an industrial equipment shell, etc.) as a subassembly, in order to solve the problem that interference and conflict may occur between the box skirt 210 and other structural members (such as beams, connecting plates, cable grooves, etc.) in the whole vehicle or product, the box is provided with a relief groove 260 at the edge of the skirt 210. This structural optimization design improves the adaptability of the box to the structure of the whole vehicle platform or system, avoiding structural changes, additional processing or reduced assembly efficiency due to assembly interference.

[0123] The relief groove 260 is arranged at the edge area of the skirt 210 of the box shell 20, and the specific position is preset according to the position of the potential interference member in the whole vehicle or equipment. The relief groove 260 is usually a recess structure or a through-hole opening structure, and the groove 250 can be rectangular, circular arc, stepped or beveled, etc., having a directional avoidance feature, which is convenient for adapting to different structural forms of the whole machine.

[0124] The size (length, width, depth) of the relief groove 260 is designed according to the space size of the member to be avoided, and the interval should be symmetrically or equidistantly distributed according to the fixed point position. The relief groove 260 is part of the integral structure of the box, maintaining the overall strength and air tightness requirements of the box shell 20, and can be realized by aluminum die casting, stretch forming or welding cutting process.

[0125] When the box is installed into the whole machine platform (such as the bottom of the vehicle body), if the contour difference of the whole vehicle structure is not considered, the skirt 210 may interfere with the vehicle frame welded parts, bolt heads, cable routing areas, etc., resulting in failure to smoothly fit and install. By presetting the relief groove 260 at the edge of the skirt 210, these structural interference areas can directly enter the groove 250, thereby realizing structural relief and ensuring that the box is flatly fitted to the fixed area of the whole vehicle, and the fastener can be accurately installed without additional adjustment.

[0126] This structure does not require additional process in actual operation, and the relief groove 260 is formed integrally with the box or pre-processed, improving the assembly consistency and standardization level.

[0127] The position of the groove 250 corresponds to the spatial layout of the interfered structure, and is usually positioned by CAE simulation in combination with the three-dimensional model or assembly data of the whole vehicle. The groove 250 cannot damage the rigidity continuity or sealing path integrity of the skirt 210, and can be supplemented by reinforcing ribs, structural ribs or sealing strips for local weakening.

[0128] If waterproof is required, an independent sealing structure or protective cover plate can be arranged in the relief groove 260.

[0129] The embodiment effectively solves the problem that the box cannot be installed or needs secondary processing due to structural interference in the whole vehicle assembly process, and further realizes the improvement of the whole machine structure matching and the optimization of the assembly efficiency, because the avoiding groove 260 is arranged at the edge of the skirt 210. The avoiding groove 260 has flexible configuration structure, and can be flexibly set according to the interfered structure, so as to reduce the platform development adaptation cost. The structure has the advantages of standardization and modular design, and is suitable for the battery pack or component layout of multiple platforms, so as to improve the product universality. The precise installation positioning and non-interference matching can be realized without relying on additional auxiliary components or adjusting process, so as to reduce the assembly complexity and human operation error.

[0130] The above in the specification is only an example of the utility model. The skilled in the art to which the utility model belongs can make various modifications or supplements to the described specific embodiments or adopt similar ways to replace, as long as it does not deviate from the content of the utility model specification or exceed the range defined by the claims, which shall belong to the protection scope of the utility model.

Claims

1. A battery pack case characterized by, The application relates to a battery pack box body, which comprises the following parts: a bottom plate, wherein a first through hole is formed at the edge of the bottom plate; a box shell, wherein the box shell comprises a containing space, one side of the box shell is provided with an opening which is in communication with the containing space, a skirt is arranged at the edge of the opening, a second through hole and a first reinforcing structure arranged at the circumferential side of the second through hole are formed in the skirt; a gasket, wherein the gasket is configured to be elastically deformed when being extruded by external force; a fastener; wherein, after the box body is assembled, the bottom plate is arranged at the opening of the box body, the fastener passes through the first through hole and the second through hole, the bottom plate is connected with the box shell, and the gasket is clamped between the skirt and the bottom plate.

2. The battery pack enclosure of claim 1, wherein, The first reinforcing structure comprises: a ring-shaped part, wherein the ring-shaped part is arranged at one side of the skirt, and the ring-shaped part is concentrically arranged with the second through hole; a first reinforcing rib, wherein the first reinforcing rib is arranged at the circumferential side of the ring-shaped part and connected with the skirt.

3. The battery pack box body according to claim 1 or 2, characterized in that: the number of the first through holes and the second through holes is several, and the circumferential side of each second through hole is provided with the first reinforcing structure; the box shell further comprises a plurality of second reinforcing structures, each second reinforcing structure is arranged between two adjacent first reinforcing structures, and only one second reinforcing structure is arranged between two adjacent first reinforcing structures.

4. The battery pack enclosure of claim 3, wherein, The second reinforcing structure is a second reinforcing rib.

5. The battery pack enclosure of claim 1, wherein, The second through hole is configured such that, when the box body is assembled, the orthographic projection contour of the first through hole on the side of the bottom plate facing the box shell is located in the range of the orthographic projection contour of the second through hole on the side of the bottom plate facing the box shell.

6. The battery pack enclosure of claim 5, wherein, The first through hole is an elliptical through hole, and the second through hole is a circular through hole, the radius of the second through hole is equal to or smaller than the short radius of the first through hole.

7. The battery pack enclosure of claim 1, wherein, The gasket is a ring-shaped structure, and the gasket is configured to extend along the circumferential direction of the edge of the skirt when the box body is assembled.

8. The battery pack case according to claim 1 or 6, characterized by, A third reinforcing rib is arranged at the inner wall of the containing space in the box shell.

9. The battery pack enclosure of claim 1, wherein, A slot is formed in the side of the box body and is in communication with the containing space.

10. The battery pack enclosure of claim 1, wherein, An avoiding slot is formed at the edge of the skirt of the box body.

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