Box body assembly, battery pack and electric equipment

Abstract

The embodiment of the utility model provides a box body assembly, a battery pack and electric equipment, the box body assembly comprises a middle cross beam, a middle longitudinal beam and a reinforced profile, the middle cross beam and the middle longitudinal beam are in tenon-and-mortise lap joint, a connecting groove is configured at the lap joint position of the middle cross beam and the middle longitudinal beam, the reinforced profile is welded to the connecting groove, and the height of the reinforced profile is not greater than that of the connecting groove. The middle cross beams and the middle longitudinal beams are fixed in a mortise and tenon joint mode, the reinforcing profiles are arranged at the connecting positions of the middle cross beams and the middle longitudinal beams, the rigidity of the intersections of the middle cross beams and the middle longitudinal beams can be greatly improved, meanwhile, the reinforcing profiles are fully welded, the welding line length is increased, the risk can be reduced, and the safety of the whole structure is improved.

Description

Technical Field

[0001] The present application relates to the technical field of batteries, and more particularly, to a box assembly, a battery pack, and an electrical device. Background Art

[0002] Energy conservation and emission reduction are the keys to the sustainable development of the automotive industry. Electric vehicles have become an important part of the sustainable development of the automotive industry due to their advantages of energy conservation and environmental protection. For electric vehicles, battery technology is an important factor related to their development.

[0003] In the development of battery technology, in addition to improving the energy density of the battery, the safety of the battery is also an issue that cannot be ignored. Therefore, how to improve the safety of the battery is an urgent technical problem in battery technology. Summary of the Utility Model

[0004] The purpose of the embodiments of the present application is to provide a box assembly, a battery pack, and an electrical device, which can enhance the safety of the overall structure.

[0005] In a first aspect, the embodiments of the present application provide a box assembly, including: a middle cross beam, a middle longitudinal beam, and a reinforcing profile. The middle cross beam and the middle longitudinal beam are tenon-mortise lapped, a connection groove is arranged at the lapping position of the middle cross beam and the middle longitudinal beam, the reinforcing profile is welded to the connection groove, and the height of the reinforcing profile is not higher than the height of the connection groove.

[0006] In the above implementation process, the middle cross beam and the middle longitudinal beam are fixed by tenon-mortise lapping, and a reinforcing profile is arranged at the connection position of the middle cross beam and the middle longitudinal beam, which can greatly improve the stiffness at the intersection of the middle cross beam and the middle longitudinal beam. At the same time, the reinforcing profile is fully welded by welding, and the extension of the weld length can reduce the risk and enhance the safety of the overall structure.

[0007] In some embodiments, a part of the structure of the connection groove is recessed in a direction away from the middle cross beam, so that this structure forms a first lapping groove, the middle cross beam is provided with a second lapping groove, and the second lapping groove is adapted to the first lapping groove, so that the height of the middle cross beam is not higher than the height of the first lapping groove.

[0008] In the above implementation process, a part of the structure of the connection groove is recessed to form a first lapping groove adapted to the second lapping groove, so as to realize the tenon-mortise lapping of the middle cross beam and the middle longitudinal beam. At the same time, the height of the middle cross beam is not higher than the height of the first lapping groove, and the reinforcing profile can be embedded in the connection groove. The size of the connection groove is the same as the outer envelope size of the reinforcing profile, but the wall thickness and the internal cross-sectional ribs of the reinforcing profile are different from those of the middle longitudinal beam, which can not only enhance the safety of the overall structure, but also effectively reduce weight and cost.

[0009] In some embodiments, the box body assembly further includes a box body frame configured to accommodate the middle cross beam and the middle longitudinal beam, and the middle cross beam and the middle longitudinal beam are respectively connected to the box body frame.

[0010] In the above implementation process, both the middle cross beam and the middle longitudinal beam are connected to the box body frame. At the same time, at the weak connection between the middle cross beam and the middle longitudinal beam, a reinforcing profile with stronger structural strength is used as a reinforcement and embedded, rather than strengthening with an overall longitudinal beam profile or a casting, which can effectively reduce weight and cost while enhancing the structural safety of the box body assembly.

[0011] In some embodiments, the box body assembly further includes a reinforcing member disposed at the end of the middle cross beam, and the reinforcing member is respectively connected to the middle cross beam and the box body frame.

[0012] In the above implementation process, the middle cross beam is connected to the box body frame through the reinforcing member, which can prevent the middle cross beam from detaching from the frame border and the external vehicle directly invading the battery cells without the cross beam blocking when the border of the box body frame deforms during a collision, and can improve its contribution value to the stiffness of the box body assembly.

[0013] In some embodiments, a stepped surface is configured on the inner edge of the box body frame, and an avoidance opening is configured on the middle cross beam, and the avoidance opening is adapted to the stepped surface. Through the adaptation of the stepped surface and the avoidance opening, the connection between the middle cross beam and the border of the box body frame is realized, which can ensure the strength of the overall structure and effectively reduce costs at the same time.

[0014] In some embodiments, the box body assembly further includes a front cross beam connected to the box body frame, and the middle longitudinal beam is tenon-mortise lapped with the front cross beam. This can improve the stiffness at the intersection of the middle longitudinal beam and the front cross beam.

[0015] In some embodiments, the box body assembly further includes a rear cross beam connected to the box body frame, and the middle longitudinal beam is tenon-mortise lapped with the rear cross beam. This can improve the stiffness at the intersection of the middle longitudinal beam and the rear cross beam.

[0016] In some embodiments, the box body assembly further includes a liquid cooling plate connected to the bottom of the box body frame.

[0017] In the above implementation process, the liquid cooling plate is located at the bottom of the box body frame. It can not only cool the battery cells in the box body assembly, but also serve as a part of the box body frame to support the battery cells, which is beneficial to improving the space utilization rate of the box body assembly.

[0018] In some embodiments, the liquid cooling plate includes a base plate, a flow channel plate and a reinforcing plate. The base plate is connected to the flow channel plate, and the reinforcing plate is located between the base plate and the flow channel plate.

[0019] In the above implementation process, a reinforcing plate is arranged between the substrate and the flow channel plate, which can not only achieve the cooling effect on the battery cells, but also, under the action of the reinforcing plate, adjust the stiffness of the liquid cooling plate to avoid failure under vibration conditions.

[0020] In a second aspect, the present application also provides a battery pack, including the box body assembly described in any one of the above.

[0021] Since the battery pack provided in the second aspect includes the box body assembly, the battery pack has all the technical effects of the box body assembly, which will not be elaborated here.

[0022] In a third aspect, the present application also provides an electrical device, including the battery pack described above.

[0023] Since the electrical device provided in the third aspect includes the battery pack, the electrical device has all the technical effects of the battery pack, which will not be elaborated here.

[0024] Other features and advantages of the present disclosure will be described in the subsequent description, or, some features and advantages can be inferred from the description or determined without doubt, or can be obtained by implementing the above technologies of the present disclosure.

[0025] To make the above objects, features and advantages of the present application more obvious and understandable, the following specific preferred embodiments are given, and in conjunction with the accompanying drawings, the detailed description is as follows. Description of the Drawings

[0026] To more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings required to be used in the embodiments of the present application. It should be understood that the following drawings only show some embodiments of the present application, so they should not be regarded as limiting the scope. For those of ordinary skill in the art, without creative efforts, other relevant drawings can also be obtained based on these drawings.

[0027] Figure 1 Structural schematic diagram of the box body assembly provided by the embodiment of the present application;

[0028] Figure 2 For Figure 1 A-A cross-sectional view of;

[0029] Figure 3 Explosion schematic diagram of the box body assembly provided by the embodiment of the present application;

[0030] Figure 4 Structural schematic diagram of part B of the box body assembly provided by the embodiment of the present application;

[0031] Figure 5 Structural schematic diagram of the adaptation of the middle cross beam and the middle longitudinal beam of the box body assembly provided by the embodiment of the present application;

[0032] Figure 6 Schematic diagram of the adaptation between the middle longitudinal beam and the front cross beam or the rear cross beam of the box body assembly provided by the embodiment of the present application;

[0033] Figure 7 Schematic diagram of the structure of the liquid cooling plate of the box body assembly provided by the embodiment of the present application;

[0034] Figure 8 Schematic diagram of the structure of the reinforcing plate of the box body assembly provided by the embodiment of the present application;

[0035] Figure 9 Schematic diagram of the structure of the battery pack provided by the embodiment of the present application.

[0036] Reference numerals

[0037] 100, middle cross beam; 101, second lapping groove; 200, middle longitudinal beam; 201, connecting groove; 202, first lapping groove; 300, reinforcing profile; 400, box body frame; 401, notch; 402, step surface; 500, reinforcing member; 600, front cross beam; 700, rear cross beam; 800, liquid cooling plate; 801, base plate; 802, flow channel plate; 803, reinforcing plate. Detailed implementation manners

[0038] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Usually, the components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the present application that is required to be protected, but only represents the selected embodiments of the present application. All other embodiments obtained by those skilled in the art based on the embodiments of the present application without creative efforts belong to the scope of protection of the present application.

[0039] In the present application, the orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal", etc. is based on the orientation or positional relationship shown in the drawings. These terms are mainly used to better describe the present application and its embodiments, and are not used to limit that the indicated devices, elements or components must have a specific orientation, or be constructed and operated in a specific orientation.

[0040] Moreover, in addition to being used to indicate orientation or positional relationship, some of the above terms may also be used to indicate other meanings. For example, the term "upper" may also be used to indicate a certain attachment relationship or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in this application can be understood according to the specific circumstances.

[0041] In addition, the terms "installed", "set up", "provided with", "connected", and "linked" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection or a point connection; it can be directly connected, or indirectly connected through an intermediate medium, or there is internal communication between two devices, components, or constituent parts. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0042] In addition, the terms "first", "second", etc. are mainly used to distinguish different devices, components, or constituent parts (the specific types and structures may be the same or different), and are not used to indicate or imply the relative importance and quantity of the indicated devices, components, or constituent parts. Unless otherwise specified, the meaning of "a plurality" is two or more.

[0043] Embodiment

[0044] In the process of design, the inventor found that with the increasing requirement for the driving range of electric vehicles, the battery power and weight are continuously increasing, posing a greater challenge to the structural strength of the battery pack box. Currently, in the industry, the liquid cooling plate is generally arranged below the module and adhesively connected to the module (or battery cell). The liquid cooling plate is generally made of 3-series aluminum plate by stamping and brazing, including a base plate and a flow channel plate. The material of the liquid cooling plate has a relatively low tensile strength. In the case of large modules or no modules, the liquid cooling plate bears most of the weight of the module and is prone to failure.

[0045] Currently, the size of the battery pack in the width direction is getting larger and closer to the body sill, increasing the requirements for the anti-collision and structural strength of the battery pack. Simple profile splicing and welding often fail to meet the requirements. Adding casting-type strengthening parts can improve the overall stiffness, but the cost of the casting mold is high and the cycle is long, and process problems are likely to occur, such as porosity is likely to occur in the casting and profile welding. If riveting is used, the cost and process of the rivets are increased.

[0046] Such as Figures 1-9As shown, in a first aspect, an embodiment of the present application provides a box body assembly, including: a middle cross beam 100, a middle longitudinal beam 200, and a reinforcing profile 300. The middle cross beam 100 is tenon-mortise lapped with the middle longitudinal beam 200. A connection groove 201 is arranged at the lapping position of the middle cross beam 100 and the middle longitudinal beam 200. The reinforcing profile 300 is welded to the connection groove 201, and the height of the reinforcing profile 300 is not higher than the height of the connection groove 201.

[0047] Exemplarily, the box body assembly is configured to accommodate electric cores or electric core modules. Taking the electric core as an example, a plurality of electric cores are provided. The middle cross beam 100 lapps the middle longitudinal beam 200 to divide the box body assembly into four installation areas. Each installation area is provided with a plurality of the electric cores. Among them, the position where the middle cross beam 100 lapps the middle longitudinal beam 200 is the weakest, and stress concentration, failure of the welds of the box body assembly and the electric cores are likely to occur at this position. Therefore, the reinforcing profile 300 is welded at the lapping position of the middle cross beam 100 and the middle longitudinal beam 200 to serve as structural strength reinforcement.

[0048] In the above implementation process, the middle cross beam 100 and the middle longitudinal beam 200 are fixed by tenon-mortise lapping, and the reinforcing profile 300 is arranged at the connection position of the middle cross beam 100 and the middle longitudinal beam 200, which can greatly improve the stiffness at the intersection of the middle cross beam 100 and the middle longitudinal beam 200. At the same time, the reinforcing profile 300 is fully welded, and the extension of the weld length can reduce the risk and enhance the safety of the overall structure.

[0049] As Figures 1-5 shown, a part of the structure of the connection groove 201 is recessed in the direction away from the middle cross beam 100, so that this structure forms a first lapping groove 202. The middle cross beam 100 is provided with a second lapping groove 101, and the second lapping groove 101 is adapted to the first lapping groove 202, so that the height of the middle cross beam 100 is not higher than the height of the first lapping groove 202.

[0050] Exemplarily, the openings of the connection groove 201 and the first lapping groove 202 are distributed upward, and the opening of the second lapping groove 101 is distributed downward, so as to realize the lapping of the middle cross beam 100 and the middle longitudinal beam 200 through the engagement of the first lapping groove 202 and the second lapping groove 101. In an embodiment of the present application, after the middle cross beam 100 and the middle longitudinal beam 200 are lapped, the height of the upper end of the middle cross beam 100 is flush with the height of the first lapping groove 202.

[0051] In the above implementation process, a part of the structure of the connecting groove 201 is recessed to form a first lap groove 202 adapted to the second lap groove 101, so as to realize the mortise and tenon lap joint of the middle cross beam 100 and the middle longitudinal beam 200. At the same time, the height of the middle cross beam 100 is not higher than the height of the first lap groove 202, and the reinforcing profile 300 can be embedded in the connecting groove 201. The size of the connecting groove 201 is consistent with the outer envelope size of the reinforcing profile 300, but the wall thickness and the internal cross-sectional ribs of the reinforcing profile 300 are different from those of the middle longitudinal beam 200, which can not only enhance the safety of the overall structure, but also effectively reduce the weight and cost.

[0052] As Figure 1 shown, the box body assembly further includes a box body frame 400, which is configured to accommodate the middle cross beam 100 and the middle longitudinal beam 200, and the middle cross beam 100 and the middle longitudinal beam 200 are respectively connected to the box body frame 400.

[0053] Exemplarily, a notch 401 is arranged on the outer side of the frame of the box body frame 400, and the notch 401 corresponds to the weak point of the vehicle collision, so as to collapse and absorb energy. The middle cross beam 100 is arranged near the notch 401, thereby enhancing the anti-collision ability of the box body assembly.

[0054] In the above implementation process, both the middle cross beam 100 and the middle longitudinal beam 200 are connected to the box body frame 400. At the same time, a reinforcing profile 300 with stronger structural strength is used as a reinforcement to be embedded at the weak connection between the middle cross beam 100 and the middle longitudinal beam 200, rather than strengthening the overall longitudinal beam profile or casting, which can effectively reduce the weight and cost, and at the same time enhance the structural safety of the box body assembly.

[0055] As Figure 2 shown, the box body assembly further includes a reinforcing member 500, which is arranged at the end of the middle cross beam 100, and the reinforcing member 500 is respectively connected to the middle cross beam 100 and the box body frame 400.

[0056] Exemplarily, the reinforcing member 500 is fixed to the frame of the box body frame 400 by riveting, so as to prevent the frame from deforming during collision and directly invading the battery cell. At the same time, the reinforcing member 500 is provided with reinforcing ribs in all directions, which can increase its contribution value to the stiffness of the box body assembly.

[0057] In the above implementation process, the middle cross beam 100 is connected to the box body frame 400 through the reinforcing member 500, which can prevent the frame of the box body frame 400 from deforming during collision, and the middle cross beam 100 is separated from the frame and the external vehicle directly invades the battery cell without the cross beam blocking, and can increase its contribution value to the stiffness of the box body assembly.

[0058] As Figure 3As shown, a stepped surface 402 is arranged on the inner edge of the box body frame 400, and the middle cross beam 100 is provided with an avoidance opening which is adapted to the stepped surface 402. Exemplarily, the stepped surface 402 includes an inclined section and a vertical section. One end of the inclined section is connected to the inner wall of the frame of the box body frame 400, and the other end is connected to the vertical section, wherein the height of the inclined section connected to the inner wall of the frame is higher than the height of the inclined section connected to the vertical section. Through the adaptation of the stepped surface 402 and the avoidance opening, the connection between the middle cross beam 100 and the frame of the box body frame 400 is realized, which can ensure the strength of the overall structure and effectively reduce the cost at the same time.

[0059] As Figure 6 shown, the box body assembly further includes a front cross beam 600 which is connected to the box body frame 400, and the middle longitudinal beam 200 is tenoned and lapped with the front cross beam 600. For example, a first mating groove is arranged at the bottom of the front cross beam 600, the opening direction of the first mating groove faces downward, and the end of the front cross beam 600 is configured to be stepped, and this stepped position is adapted to the first mating groove. It can improve the stiffness at the intersection of the middle longitudinal beam 200 and the front cross beam 600.

[0060] In some embodiments, the box body assembly further includes a rear cross beam 700 which is connected to the box body frame 400, and the middle longitudinal beam 200 is tenoned and lapped with the rear cross beam 700. For example, a second mating groove is arranged at the bottom of the rear cross beam 700, the opening direction of the second mating groove faces downward, and the end of the rear cross beam 700 is configured to be stepped, and this stepped position is adapted to the second mating groove. It can improve the stiffness at the intersection of the middle longitudinal beam 200 and the rear cross beam 700.

[0061] In some embodiments, the box body assembly further includes a liquid cooling plate 800 which is connected to the bottom of the box body frame 400.

[0062] In the above implementation process, the liquid cooling plate 800 is located at the bottom of the box body frame 400. It can not only cool the battery cells in the box body assembly. The liquid cooling plate 800 and the battery cells are bonded by applying structural adhesive or thermally conductive structural adhesive. Since the liquid cooling plate 800 is relatively soft and for cost reduction and effective heat conduction, it is generally made of a thin plate (such as an aluminum plate with a thickness of 1.0 - 1.5 mm) by brazing. At the same time, it can also be used as a part of the box body frame 400 to support the battery cells, which is beneficial to improving the space utilization rate of the box body assembly.

[0063] In some embodiments, the liquid cooling plate 800 includes a base plate 801, a flow channel plate 802, and a reinforcing plate 803. The base plate 801 is connected to the flow channel plate 802. The reinforcing plate 803 is located between the base plate 801 and the flow channel plate 802. The three are integrally formed by brazing. The reinforcing plate 803 is a stamping aluminum plate. The reinforcing plate 803 avoids the weak areas of the battery cell, such as the welds of the battery cell. The brazing area is opposite to the areas with higher strength of the battery cell (such as the electrode tab area of the battery cell), or the transverse and longitudinal beams of the lower housing, or the weakest part of the liquid cooling plate 800.

[0064] In the above implementation process, the arrangement of the reinforcing plate 803 between the base plate 801 and the flow channel plate 802 can not only achieve the cooling effect on the battery cell, but also, under the action of the reinforcing plate 803, adjust the stiffness of the liquid cooling plate 800, avoid failure under vibration conditions, balance the strength difference between the liquid cooling plate 800 and the battery cell, avoid local overstrength or overweakness, and is economically efficient and feasible.

[0065] In a second aspect, the present application further provides a battery pack, including the above-described box body assembly. The battery pack further includes battery cells, and the battery cells can be directly assembled into the box body assembly, or can be assembled into a battery cell module and then assembled into the box body assembly.

[0066] In the present application, the battery cells can include lithium-ion secondary batteries, lithium-ion primary batteries, lithium-sulfur batteries, sodium-lithium-ion batteries, sodium-ion batteries, magnesium-ion batteries, etc., and the embodiments of the present application are not limited thereto.

[0067] Since the battery pack provided in the second aspect includes the box body assembly, the battery pack has all the technical effects of the box body assembly, which will not be elaborated herein.

[0068] In a third aspect, the present application further provides an electrical device, including the above-described battery pack.

[0069] Exemplarily, the battery pack is used to provide electrical energy to the electrical device, and the electrical device can be a vehicle, a portable device, a ship, a spacecraft, an electric toy, an electric tool, etc. The vehicle can be a fuel vehicle, a gas vehicle, or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid electric vehicle, or an extended-range electric vehicle, etc.; the spacecraft includes an airplane, a rocket, a space shuttle, a spaceship, etc.; the electric toy includes a fixed or mobile electric toy, for example, a game console, an electric vehicle toy, an electric ship toy, an electric airplane toy, etc. The embodiments of the present application do not impose special restrictions on the above electrical devices.

[0070] For the convenience of description in the following embodiments, a vehicle is taken as an example of an electrical device in an embodiment of the present application for illustration.

[0071] The interior of the vehicle is provided with a battery pack, which can be arranged at the bottom, head or tail of the vehicle. The battery pack can be used for power supply of the vehicle. For example, the battery pack can be used as the operating power source of the vehicle for the vehicle's circuit system, such as for the working power requirements during vehicle startup, navigation and operation.

[0072] The vehicle may further include a controller and a motor. The controller is used to control the battery pack to supply power to the motor. For example, it is used for the working power requirements during vehicle startup, navigation and driving.

[0073] In some embodiments of the present application, the battery pack can not only be used as the operating power source of the vehicle, but also as the driving power source of the vehicle, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle.

[0074] Since the electrical equipment provided by the third party includes a battery pack, the electrical equipment has all the technical effects of the battery pack, which will not be elaborated here.

[0075] In all embodiments of the present application, "big", "small" are relative, "many", "few" are relative, and "up", "down" are relative. For the expression methods of such relative terms, the embodiments of the present application will not elaborate further.

[0076] It should be understood that "in this embodiment", "in the embodiments of the present application" or "as an optional implementation manner" mentioned throughout the specification means that the specific features, structures or characteristics related to the embodiment are included in at least one embodiment of the present application. Therefore, the appearances of "in this embodiment", "in the embodiments of the present application" or "as an optional implementation manner" throughout the specification do not necessarily refer to the same embodiment. In addition, these specific features, structures or characteristics can be combined in one or more embodiments in any suitable manner. Those skilled in the art should also know that the embodiments described in the specification are all optional embodiments, and the actions and modules involved are not necessarily essential to the present application.

[0077] In various embodiments of the present application, it should be understood that the magnitudes of the serial numbers of the above processes do not necessarily mean the inevitable sequence of execution. The execution sequence of each process should be determined according to its function and internal logic, and should not constitute any limitation to the implementation process of the embodiments of the present application.

[0078] The above is only the specific implementation manner of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present application, and all should be covered by the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A box assembly, characterized in that, Comprising: A middle cross beam, a middle longitudinal beam and a reinforcing profile, wherein the middle cross beam and the middle longitudinal beam are lap jointed with tenon and mortise, a connecting groove is arranged at the lap joint position of the middle cross beam and the middle longitudinal beam, the reinforcing profile is welded to the connecting groove, and the height of the reinforcing profile is not higher than the height of the connecting groove.

2. The cabinet assembly according to claim 1, wherein A part of the structure of the connecting groove is recessed in a direction away from the middle cross beam, so that this structure forms a first lap joint groove, the middle cross beam is provided with a second lap joint groove, and the second lap joint groove is adapted to the first lap joint groove, so that the height of the middle cross beam is not higher than the height of the first lap joint groove.

3. The box assembly according to claim 1 or 2, characterized in that, The box body assembly further includes a box body frame, the box body frame is configured to accommodate the middle cross beam and the middle longitudinal beam, and the middle cross beam and the middle longitudinal beam are respectively connected to the box body frame.

4. The cabinet assembly according to claim 3, wherein The box body assembly further includes a reinforcing member, the reinforcing member is arranged at the end of the middle cross beam, and the reinforcing member is respectively connected to the middle cross beam and the box body frame.

5. The cabinet assembly according to claim 4, wherein, A step surface is arranged on the inner edge of the box body frame, and an avoidance opening is arranged on the middle cross beam, and the avoidance opening is adapted to the step surface.

6. The cabinet assembly according to claim 3, wherein, The box body assembly further includes a front cross beam, the front cross beam is connected to the box body frame, and the middle longitudinal beam is lap jointed with the front cross beam with tenon and mortise.

7. The box assembly according to claim 6, wherein The box body assembly further includes a rear cross beam, the rear cross beam is connected to the box body frame, and the middle longitudinal beam is lap jointed with the rear cross beam with tenon and mortise.

8. The cabinet assembly according to claim 3, wherein, The box body assembly further includes a liquid cooling plate, and the liquid cooling plate is connected to the bottom of the box body frame.

9. The cabinet assembly according to claim 8, wherein The liquid cooling plate includes a base plate, a flow channel plate and a reinforcing plate, the base plate is connected to the flow channel plate, and the reinforcing plate is located between the base plate and the flow channel plate.

10. A battery pack, characterized in that, Comprising the box body assembly according to any one of claims 1-9.

11. An electrical device, characterized in that, Comprising the battery pack according to claim 10.

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