Box body and battery pack

Abstract

The invention relates to the technical field of box bodies, and discloses a box body and a battery pack, the box body comprises a box body main body and a step cross beam; the box body comprises a first end part and a second end part which are opposite to each other and are used for installing electrical components, and the step cross beam is connected with the box body and extends from the first end part to the second end part. The top of the step cross beam is at least provided with a first step surface and a second step surface which are staggered from each other in the transverse direction and have a height difference, the first step surface is used for bearing one conductive part, the second step surface is used for bearing the other conductive part, and the outer side surface of the step cross beam is used for fixing a wire harness; the technical problems that in the prior art, the safety of a box body needs to be improved on the basis of the structure that electrical components are arranged at the front end and the rear end, and installation and later maintenance are inconvenient are mainly solved.

Description

Technical Field

[0001] The present invention relates to the technical field of boxes, and particularly to a box and a battery pack. Background Art

[0002] At present, electrical components are provided at both the front end and the rear end of some boxes. To ensure that all electrical components can work, usually two conductive members are provided between the front end and the rear end. Taking the battery pack field as a specific example, at present, output interfaces need to be provided on both the front panel and the rear panel of the box of some battery packs to meet the requirement that the battery pack can discharge externally at both the front end and the rear end. Currently, the battery management module (also known as BDU in this field) used to control the working state of the battery module in the battery pack is usually placed at the front end of the box. The output interface at the front end can be connected to the battery management module through a shorter path. To enable the output interface at the rear end to also be connected to the battery management module, usually two conductive members (such as copper bars) are provided between the front end and the rear end. By spanning from the front end to the rear end through the two conductive members, an electrical connection relationship can be established between the rear-end output interface and the battery management module, thus realizing the function that the rear-end output interface can also discharge externally.

[0003] More specifically, currently, the two conductive members between the front end and the rear end are arranged in a vertically stacked manner. The vertically stacked design of the two conductive members sacrifices the electrical clearance and creepage distance between the two conductive members when the height direction is limited. Too small electrical clearance and creepage distance will pose a greater risk. Moreover, when the lower conductive member is disassembled, the upper conductive member needs to be disassembled first, which is not convenient for later maintenance. In addition, the wiring harness for transmitting the data information of the battery module to the battery management module is fixed inside the side beam of the box. However, because the space inside the battery pack is relatively narrow, the wiring harness fixed inside the side beam of the box is not convenient for installation and later after-sales maintenance.

[0004] The above information is given as background information only to assist in understanding the present disclosure, and does not determine or admit whether any of the above content can be used as the prior art relative to the present disclosure. Summary of the Invention

[0005] The present invention provides a box and a battery pack to solve the technical problems in the prior art that the safety of the box needs to be improved based on the structure with electrical components provided at both the front and rear ends, and it is not convenient for installation and later maintenance.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] A box, comprising a box body and a stepped cross beam;

[0008] The box body main body includes a first end and a second end which are opposite and both used for installing electrical components. The stepped cross beam is connected to the box body main body and extends from the first end to the second end. At least a first step surface and a second step surface which are horizontally staggered and have a height difference are arranged on the top of the stepped cross beam. The first step surface is used for carrying one conductive part, and the second step surface is used for carrying another conductive part. A first chamfer structure for fixing a wire harness is arranged on the outer side surface of the stepped cross beam.

[0009] In one technical solution, the stepped cross beam includes a cross beam main body and a convex block protruding from the top of the cross beam main body. The first step surface is arranged on the top of the convex block, and the second step surface which is adjacent to the convex block and lower than the first step surface is arranged on the top of the cross beam main body. One outer side surface of the stepped cross beam adjacent to the convex block is used for fixing the wire harness.

[0010] In one technical solution, the cross beam main body and the convex block are an integrally formed profile structure. Among them, multiple ribs are arranged in the cross beam main body.

[0011] In one technical solution, the box body further includes a front cross beam and a rear cross beam. The front cross beam is connected to the first end of the box body main body, the rear cross beam is connected to the second end of the box body main body, and the front cross beam and the rear cross beam are respectively connected to the stepped cross beam;

[0012] A through hole serving as a ventilation channel is arranged in the convex block. A first notch exposing one end of the through hole is arranged on the front cross beam, and a second notch exposing the other end of the through hole is arranged on the rear cross beam. The first notch and the second notch are both used to avoid the extension of the two conductive parts.

[0013] In one technical solution, the stepped cross beam includes a bottom surface and a first side surface and a second side surface which are respectively connected to the bottom surface and are oppositely arranged. A first chamfer structure is arranged at the connection of the first side surface and the first step surface, a second chamfer structure is arranged at the connection of the second side surface and the second step surface, a third chamfer structure is arranged at the connection of the first side surface and the bottom surface, and a fourth chamfer structure is arranged at the connection of the second side surface and the bottom surface. The first chamfer structure is used for fixing the wire harness, and the stepped cross beam is welded to the box body main body at least at the third chamfer structure and the fourth chamfer structure.

[0014] In one technical solution, the box body main body includes a liquid cooling bottom plate. The bottom of the front cross beam and the bottom of the rear cross beam are both welded to the top surface of the liquid cooling bottom plate, and the stepped cross beam is welded to the top surface of the liquid cooling bottom plate at the third chamfer structure and the fourth chamfer structure.

[0015] In one of the technical solutions, the box body further includes a plurality of buckles fixed to the first chamfer structure, and the first chamfer structure and the plurality of buckles are used to jointly limit the position of the wire harness.

[0016] In one of the technical solutions, a plurality of first cable ties are fixed on the first step surface, and a plurality of second cable ties are fixed on the second step surface. The plurality of first cable ties are used to jointly tie one of the conductive members, and the plurality of second cable ties are used to jointly tie the other conductive member.

[0017] In one of the technical solutions, a first foam is disposed on the first step surface, and a second foam is disposed on the second step surface;

[0018] The box body further includes a box cover connected to the box body main body. A third foam and a fourth foam are fixed on the inner side surface of the box cover. The first foam and the third foam are used to jointly clamp one of the conductive members, and the second foam and the fourth foam are used to jointly clamp the other conductive member;

[0019] Wherein, the third foam and the fourth foam are of a split structure or an integral structure.

[0020] The present application further provides a battery pack, including a battery module, a battery management module, a first output interface, a second output interface, a wire harness, two conductive members, and the box body according to any one of the above;

[0021] The battery management module is electrically connected to the battery module and is used to control the working state of the battery module. The first output interface and the battery management module are both disposed at the first end of the box body main body. The second output interface is disposed at the second end of the box body main body. The first output interface is electrically connected to the battery management module, and the second output interface is electrically connected to the battery management module through the two conductive members;

[0022] The wire harness is electrically connected to the battery module and the battery management module respectively and is used to transmit data information of the battery module to the battery management module.

[0023] Compared with the prior art, the box body provided by the present invention has at least the following beneficial effects:

[0024] First, for the box body adopting this solution, the wiring harness and the two conductive parts can be integrally fixed on the stepped crossbeam, facilitating the installation, disassembly, and replacement of the wiring harness and any one of the conductive parts, thereby improving the installation efficiency of the conductive parts and the wiring harness or the efficiency of later maintenance. Second, by designing the first stepped surface and the second stepped surface that are horizontally staggered and have a height difference, it can ensure a sufficient electrical clearance and creepage distance between one of the conductive parts fixed at the first stepped surface and the other conductive part fixed at the second stepped surface under a limited height, thereby reducing the risk of short circuit of the conductive parts in a high-voltage environment and further improving the safety during operation. Moreover, the stepped crossbeam of this solution can also improve the overall rigidity strength of the box body, thereby further enhancing the safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0026] Figure 1 FIG. 1 is a schematic structural diagram of a box body provided in Embodiment 1 of the present application after installing a wiring harness and two conductive parts;

[0027] Figure 2 FIG. Figure 1 is a partial enlarged view of A in FIG.

[0028] Figure 3 FIG. 2 is a schematic structural diagram of the stepped crossbeam, wiring harness, and two conductive parts provided in Embodiment 1 of the present application when they are combined;

[0029] Figure 4 FIG. Figure 3 is a schematic structural diagram of the structure shown in FIG.

[0030] Figure 5 FIG. 3 is a side view of the stepped crossbeam provided by the present application;

[0031] Figure 6 FIG. 4 is a cross-sectional view of the box body provided in Embodiment 1 of the present application at the position corresponding to the foam;

[0032] Figure 7 FIG. Figure 6 is a partial enlarged view of B in FIG.

[0033] Reference numerals:

[0034] 1. Box body main body; 11. First end; 12. Second end; 13. Front panel; 14. Rear panel; 15. Liquid cooling bottom plate;

[0035] 2. Step beam; 21. Beam body; 211. Second step surface; 212. Horizontal rib; 213. Vertical rib; 214. Inclined rib; 22. Protrusion; 221. First step surface; 222. Through hole; 23. Bottom surface; 24. First side surface; 25. Second side surface; 26. First chamfer structure; 261. Limit groove; 27. Second chamfer structure; 28. Third chamfer structure; 29. Fourth chamfer structure;

[0036] 3. Wiring harness; 4. Conductive part; 5. Buckle; 6. First cable tie; 7. Second cable tie; 8. Box cover; 9. First foam; 10. Second foam; 20. Third foam; 30. Fourth foam; 40. Front beam; 401. First notch; 50. Rear beam; 501. Second notch; 60. Middle beam. Specific embodiments

[0037] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application clearer, the present application will be further described in detail below with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0038] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0039] It should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present application.

[0040] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present application, "a plurality" means two or more unless otherwise specifically defined.

[0041] In order to make the purpose, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the drawings and embodiments.

[0042] Embodiment 1

[0043] Please refer to... togetherFigures 1 to 5 , an embodiment of the present invention provides a box body, mainly including a box body main body 1. The box body main body 1 includes opposite first end 11 and second end 12. Both the first end 11 and the second end 12 are used for installing electrical components. To ensure that the electrical components at the first end 11 and the second end 12 can work, usually two conductive members 4 are provided between the first end 11 and the first end 11. The following takes a battery pack as an example for specific illustration:

[0044] When the first end 11 is understood as the front end, the second end 12 is understood as the rear end. A battery module is usually placed between the first end 11 and the second end 12 of the box body main body 1, and a battery management module (also known as BDU in the art) is installed at the first end 11. The battery management module is electrically connected to the battery module, and the battery management module is used to collect data information (such as temperature, voltage or current information) of each battery cell in the battery module through a wire harness 3 and control the working state of the battery module according to the collected information. Since the wire harness 3 needs to be electrically connected to each battery cell in the battery module and also to the battery management module, the wire harness 3 usually extends from the second end 12 to the first end 11. In addition, some battery packs have the requirement of setting output interfaces at both the front end and the rear end, that is, some battery packs install a first output interface on the front panel 13 located at the first end 11 and a second output interface on the rear panel 14 located at the second end 12. The above-mentioned battery management module, first output interface, and second output interface are all equivalent to the above-mentioned electrical components. Specifically, the first output interface located on the front panel 13 can be electrically connected to the battery management module through a shorter path, so that the first output interface located on the front panel 13 can discharge externally. To enable the second output interface located on the rear panel 14 to be also connected to the battery management module, usually two conductive members 4 (preferably two copper bars with good conductivity in the art) are provided between the first end 11 and the second end 12. By spanning from the first end 11 to the second end 12 through the two conductive members 4, the second output interface located on the rear panel 14 can also establish an electrical connection relationship with the battery management module, thus realizing the function that the second output interface located on the rear panel 14 can also discharge externally. At this time, the polarities of the two conductive members 4 can be understood as opposite, that is, the polarity of one of the conductive members 4 is positive, and the polarity of the other conductive member 4 is negative.

[0045] Please refer to Figures 1 to 5, based on the structure with electrical components at both the first end 11 and the second end 12 and accompanied by two relatively long conductive members 4, in order to improve safety and facilitate installation or subsequent maintenance, the box body of this embodiment further includes a stepped crossbeam 2. The length direction of the stepped crossbeam 2 is the same as the direction from the first end 11 to the second end 12. On the top of the stepped crossbeam 2, there are a first stepped surface 221 and a second stepped surface 211 that are horizontally staggered in the X direction and have a height difference. Among them, the first stepped surface 221 is used to carry one of the conductive members 4, and the second stepped surface 211 is used to carry the other conductive member 4. Moreover, the outer side surface of the stepped crossbeam 2 is used for fixing the above-mentioned wire harness 3. Specifically, first, for the box body adopting this solution, the wire harness 3 and the two conductive members 4 are both integrally fixed on the stepped crossbeam 2, so as to facilitate the installation or disassembly and replacement of the wire harness 3 and any one of the conductive members 4, thereby improving the installation efficiency of the conductive member 4 and the wire harness 3 or the efficiency of later maintenance; secondly, by designing the first stepped surface 221 and the second stepped surface 211 that are horizontally staggered and have a height difference, this solution can ensure that there is a sufficient large electrical clearance and creepage distance between one of the conductive members 4 fixed at the first stepped surface 221 and the other conductive member 4 fixed at the second stepped surface 211 under a limited height, thereby reducing the risk of short circuit of the conductive member 4 in a high-voltage environment, and further improving the safety during operation; furthermore, the stepped crossbeam 2 of this solution can also improve the overall rigidity strength of the box body, thereby further improving safety.

[0046] Please refer to Figures 2 to 4 , the box body further includes a plurality of buckles 5 fixed on one side of the stepped crossbeam 2. The plurality of buckles 5 jointly limit the position of the wire harness 3, so that the wire harness 3 is fixed on the outer side surface of the stepped crossbeam 2 to prevent the wire harness 3 from falling off, in order to improve the safety of the battery pack. As Figure 5 shown, a limit groove 261 can also be provided on the outer side surface of the stepped crossbeam 2. By accommodating a part of the wire harness 3 in the limit groove 261, the risk of the wire harness 3 loosening can be further reduced, thereby further improving the safety of the battery pack. In addition, a plurality of first cable ties 6 are fixed on the first stepped surface 221, and a plurality of second cable ties 7 are fixed on the second stepped surface 211. The plurality of first cable ties 6 are used to jointly tie one of the conductive members 4, and the plurality of second cable ties 7 are used to jointly tie the other conductive member 4, so as to improve the firmness of the two conductive members 4 fixed on the stepped crossbeam 2 and prevent the conductive members 4 from loosening, in order to improve the safety of the battery pack.

[0047] Please refer to Figures 2 to 4 and Figure 6 and Figure 7, the box body further includes a box cover 8, and the box cover 8 is detachably connected to the box body main body 1. In this solution, a first foam 9 is provided on the first step surface 221, and a second foam 10 is provided on the second step surface 211. In addition, a third foam 20 and a fourth foam 30 are fixed on the inner side surface of the box cover 8. After the box cover 8 is closed, the first foam 9 and the third foam 20 jointly clamp a conductive part 4 corresponding to the first step surface 221, and the second foam 10 and the fourth foam 30 jointly clamp another conductive part 4 corresponding to the second step surface 211. Through such a design, the amplitude of vibration of the two conductive parts 4 can be reduced, so that the two conductive parts 4 can still ensure reliable electrical connection with the corresponding electrical components in a vibrating use environment (such as when a new energy vehicle with a battery pack is driving). Among them, in this embodiment, the third foam 20 and the fourth foam 30 are preferably designed as an integral structure. In other embodiments, the third foam 20 and the fourth foam 30 can also be designed as a split structure.

[0048] Please refer to again together with Figures 1 to 5 , the stepped cross beam 2 specifically includes a cross beam main body 21 and a convex block 22 protruding from the top of the cross beam main body 21. Among them, the first step surface 221 described above is provided on the top of the convex block 22, and the second step surface 211 described above is provided on the top of the cross beam main body 21. In fact, the second step surface 211 is arranged adjacent to the convex block 22, and the second step surface 211 is lower than the first step surface 221. Preferably, the above-mentioned wire harness 3 is fixed on the outer side surface adjacent to the convex block 22 of the stepped cross beam 2. Among them, the cross beam main body 21 and the convex block 22 are preferably an integrally formed profile structure, and the profile structure can be formed by extrusion, which has the advantages of easy manufacturing and low cost. Among them, multiple ribs are arranged in the cross beam main body 21 to improve the rigidity strength of the cross beam main body 21. Preferably, a connected horizontal rib 212, a vertical rib 213 and an inclined rib 214 are arranged in the cross beam main body 21 to ensure that the cross beam main body 21 has a high rigidity strength. Among them, the inclined rib 214 enables the cross beam main body 21 to withstand a high transverse shear force. When the battery module is compressed and abuts against the outer side surface of the stepped cross beam 2, the cross beam main body 21 provided with the inclined rib 214 is less likely to deform.

[0049] Please refer to together with Figure 1 and Figure 2, the box body further includes a front cross beam 40 and a rear cross beam 50. Among them, the front cross beam 40 is connected to the first end portion 11 of the box body main body 1, and the rear cross beam 50 is connected to the second end portion 12 of the box body main body 1. The front cross beam 40 and the rear cross beam 50 can further improve the rigidity strength of the box body. Moreover, the front cross beam 40 and the rear cross beam 50 are respectively welded to the stepped cross beam 2 to further improve the rigidity strength of the box body. When the outer shape of the box body main body 1 is relatively large, a middle cross beam 60 can also be provided in the middle of the box body main body 1, and the middle cross beam 60 is also designed to be welded to the stepped cross beam 2, so as to further improve the rigidity strength of the box body. In addition, a first notch 401 is provided on the front cross beam 40, and a second notch 501 is provided on the rear cross beam 50. The first notch 401 and the second notch 501 are both used to avoid the extension of the two conductive parts 4, so that one end of the conductive part 4 can be connected to the battery management module, and the other end of the conductive part 4 can be connected to the second output interface. In addition, a through hole 222 is provided in the above-mentioned convex block 22. This through hole 222 can be used as a ventilation channel, so that the gas in the battery pack can quickly discharge outward along this through hole 222, improving the exhaust efficiency of the battery pack and reducing the risk of thermal runaway of the battery pack. In order to ensure that the through hole 222 can ventilate smoothly, one end of the through hole 222 needs to be designed to be exposed when the first notch 401 is opened, and the other end of the through hole 222 needs to be designed to be exposed when the second notch 501 is opened.

[0050] Please refer to Figures 1 to 5, the stepped crossbeam 2 includes a bottom surface 23 and a first side surface 24 and a second side surface 25 that are respectively connected to the bottom surface 23 and are oppositely arranged. Among them, a first chamfer structure 26 is provided at the connection between the first side surface 24 and the first step surface 221, a second chamfer structure 27 is provided at the connection between the second side surface 25 and the second step surface 211, a third chamfer structure 28 is provided at the connection between the first side surface 24 and the bottom surface 23, and a fourth chamfer structure 29 is provided at the connection between the second side surface 25 and the bottom surface 23. Among them, the first chamfer structure 26 and the multiple buckles 5 jointly limit the position of the wire harness 3. The first chamfer structure 26 enables the multiple buckles 5 to be installed obliquely, reducing the installation difficulty of the buckles 5. The above-mentioned limiting groove 261 is provided on this first chamfer structure 26. Moreover, by providing the first chamfer structure 26 and the second chamfer structure 27, the problem that the stepped crossbeam 2 may scratch the battery module when the battery module is inserted can be solved. In addition, the stepped crossbeam 2 is welded to the box body main body 1 at least at the third chamfer structure 28 and the fourth chamfer structure 29. By providing the third chamfer structure 28 and the fourth chamfer structure 29, the solder can be hidden at the third chamfer structure 28 and the fourth chamfer structure 29, solving the problem that the battery module cannot be installed downward in place due to the exposure of the solder. At this time, both the first side surface 24 and the second side surface 25 of the stepped crossbeam 2 are in contact with the outer walls of the corresponding battery modules to limit the positions of the corresponding battery modules. Preferably, the box body main body 1 includes a liquid-cooled bottom plate 15. The bottoms of the above-mentioned front crossbeam 40 and the rear crossbeam 50 are both welded to the top surface of the liquid-cooled bottom plate 15. The stepped crossbeam 2 is welded to the top surface of the liquid-cooled bottom plate 15 at the third chamfer structure 28 and the fourth chamfer structure 29. The liquid-cooled bottom plate 15 is used to cool the bottom of the battery module to enable the battery module to work within a suitable temperature range.

[0051] Embodiment 2

[0052] Please refer to Figures 1 to 5 , this embodiment provides a battery pack, including the above-mentioned box body and a battery module, a battery management module (also known as BDU in the art), a first output interface, a second output interface, a wire harness 3 and two conductive parts 4 respectively accommodated inside the box body. Among them, the wire harness 3 is respectively electrically connected to each battery cell in the battery module and the battery management module. The wire harness 3 is used to transmit data information (such as voltage, current or temperature data) of each battery cell in the battery module to the battery management module. The battery management module is electrically connected to the battery module and is used to control the working state of the battery module according to the data information collected from the wire harness 3. The first output interface and the battery management module are both arranged at the first end portion 11 of the box body main body 1, the second output interface is arranged at the second end portion 12 of the box body main body 1, the first output interface is electrically connected to the battery management module, so that the first output interface can discharge externally, and the second output interface is electrically connected to the battery management module through two conductive parts 4, so that the second output interface can also discharge externally.

[0053] The above are only preferred embodiments of the present invention, and only specifically describe the technical principles of the present invention. These descriptions are only for explaining the principles of the present invention and cannot be interpreted as limiting the scope of protection of the present invention in any way. Based on the explanations here, any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention, and other specific implementations of the present invention that can be associated with by technicians in this field without creative labor, should be included in the scope of protection of the present invention.

Claims

1. A box body, characterized in that, It includes a box body main body (1) and a stepped cross beam (2); The box body main body (1) includes a first end portion (11) and a second end portion (12) for installing electrical components. The stepped cross beam (2) is connected to the box body main body (1) and extends from the first end portion (11) to the second end portion (12). At least a first stepped surface (221) and a second stepped surface (211) which are staggered from each other in the transverse direction and have a height difference are provided on the top of the stepped cross beam (2). The first stepped surface (221) is used for carrying one conductive part (4), and the second stepped surface (211) is used for carrying another conductive part (4). The outer side surface of the stepped cross beam (2) is used for fixing a wire harness (3).

2. The box according to claim 1, characterized in that, The stepped cross beam (2) includes a cross beam main body (21) and a convex block (22) protruding from the top of the cross beam main body (21). The first stepped surface (221) is provided on the top of the convex block (22). The second stepped surface (211) which is adjacent to the convex block (22) and lower than the first stepped surface (221) is provided on the top of the cross beam main body (21). A first chamfer structure (26) for fixing the wire harness (3) is provided on an outer side surface of the stepped cross beam (2) adjacent to the convex block (22).

3. The box according to claim 2, wherein The cross beam main body (21) and the convex block (22) are of an integrally formed profile structure. Among them, multiple ribs are arranged in the cross beam main body (21).

4. The box according to claim 2, wherein, The box body further includes a front cross beam (40) and a rear cross beam (50). The front cross beam (40) is connected to the first end portion (11) of the box body main body (1), and the rear cross beam (50) is connected to the second end portion (12) of the box body main body (1). The front cross beam (40) and the rear cross beam (50) are respectively connected to the stepped cross beam (2); A through hole (222) serving as a ventilation channel is provided in the convex block (22). A first notch (401) exposing one end of the through hole (222) is provided on the front cross beam (40), and a second notch (501) exposing the other end of the through hole (222) is provided on the rear cross beam (50). The first notch (401) and the second notch (501) are both used for avoiding the extension of the two conductive parts (4).

5. The box according to claim 4, characterized in that, The stepped crossbeam (2) includes a bottom surface (23) and a first side surface (24) and a second side surface (25) which are respectively connected to the bottom surface (23) and are oppositely arranged. A first chamfer structure (26) is provided at the connection between the first side surface (24) and the first stepped surface (221), a second chamfer structure (27) is provided at the connection between the second side surface (25) and the second stepped surface (211), a third chamfer structure (28) is provided at the connection between the first side surface (24) and the bottom surface (23), and a fourth chamfer structure (29) is provided at the connection between the second side surface (25) and the bottom surface (23). The first chamfer structure (26) is used for fixing the wire harness (3), and the stepped crossbeam (2) is welded to the box body main body (1) at least at the third chamfer structure (28) and the fourth chamfer structure (29).

6. The box according to claim 5, characterized in that, The box body main body (1) includes a liquid-cooled bottom plate (15). The bottom of the front crossbeam (40) and the bottom of the rear crossbeam (50) are both welded to the top surface of the liquid-cooled bottom plate (15). The stepped crossbeam (2) is welded to the top surface of the liquid-cooled bottom plate (15) at the third chamfer structure (28) and the fourth chamfer structure (29).

7. The box according to claim 5, characterized in that The box body further includes a plurality of buckles (5) fixed to the first chamfer structure (26). The first chamfer structure (26) and the plurality of buckles (5) are used to jointly limit the position of the wire harness (3).

8. The box according to claim 1, characterized in that, A plurality of first cable ties (6) are fixed on the first stepped surface (221), and a plurality of second cable ties (7) are fixed on the second stepped surface (211). The plurality of first cable ties (6) are used to jointly bundle one of the conductive parts (4), and the plurality of second cable ties (7) are used to jointly bundle the other conductive part (4).

9. The box according to claim 1, wherein, A first foam (9) is arranged on the first stepped surface (221), and a second foam (10) is arranged on the second stepped surface (211); The box body further includes a box cover (8) connected to the box body main body (1). A third foam (20) and a fourth foam (30) are fixed on the inner side surface of the box cover (8). The first foam (9) and the third foam (20) are used to jointly clamp one of the conductive parts (4) corresponding to the first stepped surface (221), and the second foam (10) and the fourth foam (30) are used to jointly clamp one of the conductive parts (4) corresponding to the second stepped surface (211); Wherein, the third foam (20) and the fourth foam (30) are of a split structure or an integral structure.

10. A battery pack, characterized in that, Including a battery module, a battery management module, a first output interface, a second output interface, a wire harness (3), two conductive parts (4) and a box body according to any one of claims 1 to 9; The battery management module is electrically connected to the battery module and is used to control the working state of the battery module. The first output interface and the battery management module are both arranged at the first end portion (11) of the box body main body, the second output interface is arranged at the second end portion (12) of the box body main body, the first output interface is electrically connected to the battery management module, and the second output interface is electrically connected to the battery management module through the two conductive members (4); The wiring harness (3) is electrically connected to the battery module and the battery management module respectively and is used to transmit the data information of the battery module to the battery management module.

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