BDU device and battery pack

Abstract

The BDU device and the battery pack comprise a shell, a plurality of busbars and a relay, the shell comprises a shell bottom wall and a shell side wall, the shell side wall is arranged on the shell bottom wall in a surrounding mode to form a containing cavity, the shell bottom wall is provided with a first receding opening, the busbars are fixed to the shell bottom wall, the relay is arranged in the containing cavity, and the first receding opening is formed in the shell side wall. The main body is provided with a convex rib, the two sides of the convex rib are respectively provided with at least one contact, each contact is connected with the busbar assembly, the relay also comprises a convex rib which is convexly arranged on the main body, and the convex rib is arranged in the first avoiding opening in a penetrating manner. The convex rib of the relay is arranged in the first avoiding hole, and the side wall of the shell or the upper cover does not need to increase the height for accommodating the convex rib, so that the occupied space is reduced, and the technical problem that the height of the BDU shell is relatively high is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, and particularly relates to a BDU device and a battery pack. Background Art

[0002] In the related art, a BDU (Battery Distribution Unit) is usually provided in a power battery pack, which is mainly responsible for controlling the disconnection and connection of the automotive power battery and high-voltage electricity. Generally, it includes a box body, a relay, a pre-charge resistor, a fuse, a bus bar, and a current sensor. Among them, the BDU system sets an injection-molded housing to achieve insulation protection inside the PACK upper cover. The injection-molded upper cover requires developing a mold and the material thickness is more than 2 mm. Since the main circuit relays in the system mostly adopt vertical installation, the cumulative height of the BDU housing and the upper cover generally reaches more than 90 mm. With the requirements of CTP (i.e., Cell to Pack technology, also called module-free technology), the overall height of the PACK is becoming more and more limited. Summary of the Utility Model

[0003] The embodiment of the utility model provides a BDU device and a battery pack, which can improve the technical problem of the too high height of the existing BDU housing.

[0004] On the one hand, the present application provides a BDU device, including:

[0005] A housing, including a housing bottom wall and a housing side wall. The housing side wall surrounds the housing bottom wall to form an accommodation chamber. The housing bottom wall is provided with a first avoidance opening;

[0006] A plurality of bus bars, fixed to the housing bottom wall;

[0007] A relay, disposed in the accommodation chamber. The relay includes a main body and a rib protruding from the main body. A plurality of contacts are provided on the main body. At least one contact is provided on each side of the rib. Each contact is connected to one of the bus bars. The rib passes through the first avoidance opening.

[0008] In one embodiment, the BDU device includes a first fastener. The first fastener includes an end portion and a rod portion connected to each other. The rod portion passes through the bus bar and is connected to the contact, so as to tightly connect the bus bar and the relay. A counterbore is provided on the side of the bus bar away from the housing bottom wall. The end portion is disposed in the counterbore.

[0009] In one embodiment, the BDU device further includes a heat-conducting layer. Each bus bar is attached to the housing bottom wall, and a heat-conducting layer is provided between each bus bar and the housing bottom wall.

[0010] In one embodiment, the BDU device further includes a plurality of protective covers and copper posts. The copper posts penetrate through the housing. The copper posts include a first part and a second part. The first part is located inside the housing and is connected to the bus bar. The second part is located outside the housing and is used for connecting to an external electrical component. The protective cover covers the second part.

[0011] In one embodiment, the housing is provided with a plurality of notches. The second part protrudes from the notches. The protective cover includes a cover body and an elastic buckle connected to the cover body. The protective cover is detachably installed on the housing to cover the notches.

[0012] In one embodiment, the housing includes a limiting member disposed inside the notch. The limiting members are disposed opposite to each other on both sides of the copper post. The cover body includes oppositely disposed cover body side walls and elastic buckles. Each elastic buckle is connected to one of the cover body side walls and is correspondingly installed on the limiting member.

[0013] In one embodiment, the BDU device further includes a blister upper cover. The blister upper cover is fixedly installed on the side wall of the housing to seal the accommodation chamber.

[0014] In one embodiment, an installation post is provided inside the housing. The relay further includes an installation portion protruding from the main body. The BDU device includes a second fastener. The installation post and the installation portion are connected by the second fastener.

[0015] In one embodiment, the BDU device further includes a base. The base includes a bottom plate, a surrounding plate, and a connecting plate. Along the height direction of the base, the surrounding plate surrounds the periphery of the bottom plate. The bottom plate and the surrounding plate are bent and connected by the connecting plate. The bottom plate is provided with a second avoidance opening corresponding to the first avoidance opening. The convex rib penetrates through the second avoidance opening. There is a height difference between the connecting plate and the convex rib.

[0016] In a second aspect, an embodiment of the present invention provides a battery pack. The battery pack includes a box body and a BDU device. The BDU device is installed on the box body.

[0017] Advantageous effects of the embodiments of the present invention:

[0018] In an embodiment of the present utility model, the BDU device includes a housing, a plurality of busbars, and a relay. The housing includes a housing bottom wall and a housing side wall. The housing side wall surrounds the housing bottom wall to form an accommodation chamber. The housing bottom wall is provided with a first avoidance opening. The busbars are fixed to the housing bottom wall, and the relay is arranged in the accommodation chamber. The relay includes a main body, and a plurality of contact points are arranged on the main body. At least one contact point is arranged on each side of the rib, and each contact point is connected to a busbar. The relay further includes a rib protruding from the main body, and the rib passes through the first avoidance opening. The rib of the relay is arranged in the first avoidance hole, and there is no need to increase the height of the housing side wall or the upper cover to accommodate the rib, reducing the occupied space and solving the technical problem that the height of the BDU housing is relatively high, occupying a large space, resulting in an excessively high height of the entire battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present utility model. For those skilled in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0020] Figure 1 is a schematic structural diagram of the BDU device provided by the embodiment of the present utility model Figure 1 .

[0021] Figure 2 is a schematic structural diagram of the BDU device provided by the embodiment of the present utility model Figure 2 .

[0022] Figure 3 is an exploded schematic diagram of the BDU device provided by the embodiment of the present utility model.

[0023] Figure 4 is a schematic structural diagram of the relay provided by the embodiment of the present utility model.

[0024] Figure 5 is the bottom view of the BDU device provided by the embodiment of the present utility model Figure 1 .

[0025] Figure 6 is an enlarged schematic diagram of the partial A of the BDU device provided by the embodiment of the present utility model

[0026] Figure 7 is the bottom view of the BDU device provided by the embodiment of the present utility model Figure 2 .

[0027] Figure 8 is an enlarged schematic diagram of the partial B1 of the BDU device provided by the embodiment of the present utility model.

[0028] Figure 9 It is an enlarged schematic view of a partial B2 of the BDU device provided by an embodiment of the present utility model.

[0029] Figure 10 It is a structural schematic diagram of the BDU device provided by an embodiment of the present utility model Figure 3 。

[0030] Figure 11 It is an enlarged schematic view of a partial C of the BDU device provided by an embodiment of the present utility model

[0031] Figure 12 It is a structural schematic diagram of the BDU device provided by an embodiment of the present utility model Figure 4 ;

[0032] Figure 13 It is an enlarged schematic view of a partial D of the BDU device provided by an embodiment of the present utility model.

[0033] Reference numerals:

[0034] 100, BDU device;

[0035] 10, housing; 11, housing side wall; 111, mounting structure; 12, housing bottom wall; 13, first avoidance opening; 14, notch; 15, limiting member;

[0036] 20, bus bar; 21, counterbore;

[0037] 30, relay; 301, main body; 31, contact; 32, rib;

[0038] 40, first fastener; 41, rod portion; 42, end portion;

[0039] 50, protective cover; 501, cover body; 51, copper column; 52, elastic buckle; 53, protrusion;

[0040] 60, blister upper cover;

[0041] 70, mounting post, 71, mounting portion;

[0042] 80, base; 81, bottom plate; 811, second avoidance opening; 82, enclosing plate; 83, connecting plate; Detailed implementation manners

[0043] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative efforts belong to the scope of protection of the present invention. In addition, it should be understood that the specific implementation manners described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention. In the present invention, unless otherwise specified, the orientation words such as "upper" and "lower" generally refer to the upper and lower in the actual use or working state of the device, specifically the drawing direction in the accompanying drawings; and "inner" and "outer" refer to the outline of the device.

[0044] In the related art, a BDU (Battery Distribution Unit) is usually provided in a power battery pack, which is mainly responsible for controlling the disconnection and connection of the automotive power battery and high-voltage electricity. Generally, it includes a box body, a relay 30, a pre-charge resistor, a fuse, a busbar 20, and a current sensor. Among them, the BDU system is provided with an injection-molded housing to achieve insulation protection inside the PACK upper cover. The injection-molded upper cover requires developing a mold and the material thickness is more than 2 mm. Since the main circuit relay 30 of the system is mostly installed vertically, the cumulative height of the BDU housing and the upper cover generally reaches more than 90 mm. With the requirements of CTP (Cell to Pack technology, also called the module-free technology), the overall height of the PACK is becoming more and more limited.

[0045] Please refer to Figures 1-3 , Figure 1 which is a schematic structure diagram of the BDU device provided by the embodiment of the present invention Figure 1 , Figure 2 which is a schematic structure diagram of the BDU device provided by the embodiment of the present invention Figure 2 , Figure 3It is an explosion schematic diagram of the BDU device provided by the embodiment of the present utility model. The present application provides a BDU device 100. The BDU main body 301 is the core of the device and is used for electrically connecting with the battery pack and the control system to establish a control loop. The BDU device 100 includes a housing 10, a busbar 20 assembly, and a relay 30. The housing 10 includes a housing bottom wall 12 and a housing side wall 11. The housing side wall 11 surrounds the housing bottom wall 12 to form an accommodation chamber. The housing bottom wall 12 is provided with a first avoidance opening 13. A plurality of busbars 20 are fixed to the housing bottom wall 12. The busbars 20 can be made of copper or aluminum. The BDU device 100 further includes electrical components. The electrical components can specifically be devices for realizing circuit connection and various electrical functions, including but not limited to a relay 30, a fuse, a current sensor, and a resistor. Among them, a plurality of relays 30 can be provided. The relay 30 is used to close or disconnect the connection between the power battery and the high-voltage electrical equipment. The fuse is used to protect the electrical equipment or the power battery when a fault such as a short circuit occurs in the high-voltage circuit. Please refer to Figures 4-5 , Figure 4 It is a structural schematic diagram of the relay provided by the embodiment of the present utility model. The relay 30 is arranged in the accommodation chamber. The relay 30 includes a main body 301 and a rib 32 protruding from the main body 301. A plurality of contacts 31 are arranged on the main body 301. At least one contact 31 is arranged on each side of the rib 32. Each contact 31 is connected to a busbar 20. The rib 32 separates the two contacts 31 between the relays 30, which can prevent an arc from being generated between the two contacts 31 of the relay 30 during the process of energizing or de-energizing, so as to improve the safety performance of the relay 30 module in this embodiment.

[0046] A gap is formed between adjacent busbars 20. The rib 32 passes through the gap and also passes through the first avoidance opening 13. In the present application, the relay 30 is installed upside down and fixed to be connected with the busbar 20 on the housing bottom wall 12, and the rib 32 of the relay 30 is arranged in the first avoidance opening 13. The height of the housing side wall 11 or the upper cover does not need to be increased to accommodate the rib 32, the overall height of the housing 10 is reduced, and the occupied space is reduced, solving the technical problems of the high height of the BDU housing 10, large occupied space, and tight space of the whole battery pack. In addition, there is no need to re-develop the mold for the upper cover or the housing 10, reducing the production and manufacturing costs.

[0047] Please refer to Figures 5-8 , Figure 5 It is the bottom view of the BDU device provided by the embodiment of the present utility model Figure 1 , Figure 6 It is an enlarged schematic diagram of the partial A of the BDU device provided by the embodiment of the present utility model, Figure 7 It is the bottom view of the BDU device provided by the embodiment of the present utility model Figure 2 , Figure 8It is an enlarged schematic diagram of a partial B1 of the BDU device provided by an embodiment of the present utility model.

[0048] In some embodiments, the BDU device 100 includes a first fastener 40. The first fastener 40 includes an end portion 42 and a rod portion 41 that are connected to each other. The rod portion 41 passes through the bus bar 20 and is connected to the contact 31 so as to tightly connect the bus bar 20 and the relay 30. A counterbore 21 is provided on one side of the bus bar 20 facing the bottom wall 12 of the housing, and the end portion 42 is disposed in the counterbore 21.

[0049] Please refer to Figure 9 , FIG. 9 is an enlarged schematic diagram of a partial B2 of the BDU device provided by an embodiment of the present utility model. In some examples, the end portion 42 can be a nut, the rod portion 41 can be a screw rod, the bus bar 20 is provided with a through hole, the through hole is arranged corresponding to the contact 31, and the screw rod 41 passes through the through hole. A counterbore 21 communicating with the through hole is provided on one side of the bus bar 20 facing the bottom wall 12 of the housing. The diameter of the counterbore 21 is larger than the diameter of the through hole, and the counterbore 21 is used to accommodate the nut. When the nut tightly connects the bolt to the bus bar 20 and the relay 30, the nut is disposed in the counterbore 21, and the counterbore 21 ensures that the lowest point of the nut will not be lower than the bottom surface of the bus bar 20, preventing it from protruding from the bus bar 20 and causing the bottom of the bus bar 20 to bulge, thereby increasing the height of the housing 10.

[0050] In some examples, the first fastener 40 can be a screw. The end portion 42 is the head of the screw, and the rod portion 41 is the threaded portion of the screw. When the threaded portion passes through the through hole, the head is disposed in the counterbore 21.

[0051] In some embodiments, each bus bar 20 is attached to the bottom plate 81.

[0052] In the related art, the top of the electrical components in the housing 10 is connected to the bus bar 20, and the bus bar 20 needs to be bent from the top of the electrical components to the bottom of the electrical components. In the embodiments of the present application, the relay 30 is installed upside down, shortening the length of the bus bar 20, reducing costs, and also saving the space occupied by the bus bar 20, improving the space utilization rate inside the housing 10.

[0053] It can be understood that the bus bar 20 maintains a flat plate structure, that is, the processing of the bus bar 20 only requires simple steps such as blanking, punching, and trimming to complete the structural processing, which simplifies the manufacturing and processing process of the bus bar 20 as a whole.

[0054] In some embodiments, the BDU device 100 further includes a heat-conducting layer. A heat-conducting layer is provided between each bus bar 20 and the bottom wall 12 of the housing.

[0055] In some embodiments, the heat-conducting layer can be a heat-conducting insulating film and a heat-conducting pad. That is, after a PET insulating film is attached to the bottom of the bus bar 20, a heat-conducting pad is attached to dissipate and expand the heat of the bus bar 20, so that the heat on the bus bar 20 is directly conducted to the heat-conducting pad.

[0056] It can be understood that the PET insulating film is an insulating film made of polyethylene terephthalate as the base material. The PET material has good electrical insulation performance and can effectively prevent direct contact between the conductive part of the battery bus bar 20 and other electrodes, thereby reducing the risk of short circuit. The PET film has good heat resistance within a certain temperature range and can withstand certain temperature changes during battery operation without failure.

[0057] In some embodiments, the heat-conducting pad can be a silicone heat-conducting pad, or it can also be made of a material with good heat-conducting and insulating properties. This makes the heat dissipation of the bus bar 20 more efficient, thus contributing to the efficient heat dissipation of the BDU device 100.

[0058] Please refer to Figures 10-13 , Figure 10 which is the structural schematic diagram of the BDU device provided by the embodiment of the present utility model Figure 3 , Figure 11 which is the enlarged schematic diagram of the partial C of the BDU device provided by the embodiment of the present utility model. Figure 12 which is the structural schematic diagram of the BDU device provided by the embodiment of the present utility model Figure 4 , Figure 13 which is the enlarged schematic diagram of the partial D of the BDU device provided by the embodiment of the present utility model. In some embodiments, the BDU device 100 further includes a plurality of protective covers 50 and copper posts 51. The copper posts 51 pass through the housing 10. The copper posts 51 include a first part and a second part. The first part is located inside the housing 10 and is connected to the bus bar 20, and the second part is located outside the housing 10 for connecting to external electrical components. The protective cover 50 covers the second part.

[0059] Specifically, the housing 10 includes a cylindrical protective sleeve. The copper posts 51 are arranged inside the protective sleeve. One end of the copper posts 51 is connected to the bottom bus bar 20 through fasteners such as studs and bolts, and the other end is used to connect to external electrical components such as the bus bar 20. The protective cover 50 covers the copper posts 51 to improve the safety effect and prevent users from accidentally touching the copper posts 51.

[0060] In some embodiments, the housing 10 is provided with a plurality of notches 14. The copper posts 51 protrude from the notches 14. The protective cover 50 includes a cover body 501 and an elastic buckle 52 connected to the cover body 501. The protective cover 50 is detachably installed on the housing 10 to cover the notches 14.

[0061] In some examples, the elastic buckle 52 includes a hooking portion, and a hole position corresponding to the hooking portion is provided on the housing 10. When the protective cover 50 is installed on the housing 10, the hooking portion hooks on the hole position of the housing 10. When the notch 14 needs to be opened, the hooking portion is disengaged from the hole position.

[0062] In some embodiments, the housing 10 includes a limiting member 15 disposed in the avoidance groove. The limiting members 15 are oppositely arranged on both sides of the copper column 51. The cover body 501 includes oppositely arranged side walls of the cover body 501 and elastic buckles 52. Each elastic buckle 52 is connected to a side wall of the cover body 501 and is correspondingly installed on the limiting member 15.

[0063] Specifically, an opening is provided on the side wall of the cover body 501, and the elastic buckle 52 is located inside the opening. The elastic buckle 52 includes an elastic arm, and the elastic arm is connected to the side wall of the cover body 501. When the user presses the elastic buckle 52, the elastic buckle 52 undergoes elastic deformation to disengage the protective cover from the limiting member 15, and the notch 14 is opened, exposing the internal copper column 51. When the protective cover is installed on the housing 10, the elastic buckle 52 resets. The limiting member 15 includes a limiting surface facing the elastic buckle 52, and the limiting surface abuts against the elastic buckle 52.

[0064] Among them, the limiting member 15 includes a first connecting section and a second connecting section that are perpendicular to each other. The first connecting section extends in the horizontal direction, and the second connecting section extends in the vertical direction. The first connecting section and the second connecting section form a T-shaped structure. Two protrusions are provided on the elastic arm of the elastic buckle 52. The protrusions are respectively located on both sides of the second connecting section, and a limiting groove is formed between the two protrusions. When the protective cover is installed on the housing 10 through the elastic buckle 52, the second connecting section is disposed in the limiting groove.

[0065] In some embodiments, the BDU device 100 further includes a blister upper cover 60, and the blister upper cover 60 is fixedly installed on the housing 10 to seal the accommodation chamber.

[0066] Specifically, the upper cover is used to protect the electrical components, circuits, etc. inside the BDU device 100. In some embodiments, the upper cover is made of an insulating material through a blister process. Compared with an injection-molded upper cover that requires a more complex mold, the upper cover made by the blister process is thinner overall, can reduce the use of production raw materials, and thus reduce costs. Moreover, the upper cover made by the blister process is thinner and has stronger deformation ability, and can absorb some impact forces through deformation to protect the electrical components and circuits inside the BDU device.

[0067] In some embodiments, the upper cover is formed by blistering with polycarbonate plastic. The thickness of the upper cover can be between 0.5 mm and 1 mm, such as 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1.0 mm. The upper cover and the housing 10 can be fixed using fasteners such as rivets, screws, etc., and this application does not make a limitation here.

[0068] It is understandable that when the housing 10 is provided with a plurality of notches 14 for installing the protective cover 50, the blister upper cover 60 is provided with grooves communicating with the notches 14 at the positions corresponding to the notches 14. For example, if six protective covers 50 need to be provided, the blister upper cover 60 is correspondingly provided with six grooves.

[0069] In some embodiments, the blister upper cover 60 can be cancelled, and an alternative protective structure is used to cover the parts inside the housing 10.

[0070] In some embodiments, the housing 10 is provided with mounting posts 70. The relay 30 further includes a mounting portion 71 protruding from the main body 301. The BDU device 100 includes a second fastener, and the mounting post 70 and the mounting portion 71 are connected by the second fastener.

[0071] Specifically, an installation groove matching the electrical component assembly is formed in the housing 10, which is convenient for the installation and fixation of the electrical component assembly. During installation, the electrical components can be first snapped into the corresponding installation grooves on the main housing 10, and then the housing side wall 11 and the housing bottom wall 12 are connected to fix the electrical component assembly in the accommodation cavity. The mounting posts 70 are arranged in the installation grooves, the mounting portion 71 is connected to the side of the main body 301, and each second fastener is connected to the mounting portion 71 and the corresponding mounting post 70 of the mounting portion 71, so that the relay 30 is fixed to the mounting post 70, further increasing the installation stability of the relay 30 and preventing the relay 30 from falling off under external vibration. The second fastener can be a stud, a bolt, a screw, etc., and the present application does not limit this here.

[0072] In some embodiments, the base 80 includes a bottom plate 81, a surrounding plate 82 and a connecting plate 83. Along the height direction of the base 80, the surrounding plate 82 is arranged around the periphery of the bottom plate 81, and the bottom plate 81 and the surrounding plate 82 are bent and connected through the connecting plate 83. The bottom plate 81 is provided with a second avoidance opening 811 corresponding to the first avoidance opening 13, and the convex rib 32 passes through the second avoidance opening 811, and there is a height difference between the connecting plate 83 and the convex rib 32.

[0073] Specifically, the base 80 is completed by stamping a steel plate. A plurality of mounting structures 111 are connected around the housing side wall 11. The BDU device 100 further includes a plurality of third fasteners, and the third fasteners pass through the mounting structures 111 and the bottom plate 81 to fix the housing 10 to the base 80.

[0074] It is understandable that the housing bottom wall 12 and the bottom plate 81 have a certain thickness, so the length of the convex rib 32 protruding from the second avoidance opening 811 is short. The surrounding plate 82 is used to keep the bottom plane state, the connecting plate 83 is used to protect the protruding convex rib 32, the lowest point of the connecting plate 83 is lower than the lowest point of the convex rib 32, and the height surrounded by the connecting plate 83 is shorter than the increased height of the housing side wall 11 when the relay 30 is set upright.

[0075] The present application further provides a battery pack, which includes a box body and a BDU device 100. The BDU device 100 is installed in the box body, for example, it can be installed in the box body by welding, and the present application does not limit this here.

[0076] The above has introduced the embodiments of the present utility model in detail. Specific examples are used herein to elaborate on the principle and implementation manner of the present utility model. The description of the above embodiments is only used to help understand the method and its core idea of the present utility model; at the same time, for those skilled in the art, according to the idea of the present utility model, there will be changes in the specific implementation manner and application scope. In summary, the content of this specification should not be construed as a limitation to the present utility model.

Claims

1. A BDU device, characterized in that: include: The shell comprises a shell bottom wall and a shell side wall, wherein the shell side wall is arranged around the shell bottom wall to form a receiving chamber, and the shell bottom wall is provided with a first avoidance opening; A plurality of bus bars fixed to the bottom wall of the housing; A relay is arranged in the accommodating chamber, the relay includes a main body and a convex rib protruding from the main body, a plurality of contacts are arranged on the main body, at least one contact is arranged on each side of the convex rib, each contact is connected to one of the bus bars, and the convex rib is passed through the first avoidance opening.

2. The BDU device according to claim 1, characterized in that: The BDU device includes a first fastener, which includes an end portion and a rod portion connected to each other. The rod portion is passed through the bus and connected to the contact to ensure a tight connection between the bus and the relay. A countersunk hole is provided on a side of the bus away from the bottom wall of the shell, and the end portion is provided in the countersunk hole.

3. The BDU device according to claim 2, characterized in that: The BDU device further includes a heat-conducting layer. Each of the busbars is attached to the bottom wall of the shell, and a heat-conducting layer is provided between each of the busbars and the bottom wall of the shell.

4. The BDU device according to any one of claims 1 to 3, characterized in that: The BDU device also includes a plurality of protective covers and copper pillars, wherein the copper pillars are passed through the shell, and the copper pillars include a first part and a second part, wherein the first part is located inside the shell and connected to the bus, and the second part is located outside the shell for connecting to external electrical components, and the protective cover is provided on the second part.

5. The BDU device according to claim 4, characterized in that: The shell is provided with a plurality of notches, the second part is protruding from the notches, the protective cover comprises a cover body and an elastic buckle connected to the cover body, and the protective cover is detachably mounted on the shell to cover the notches.

6. The BDU device according to claim 5, characterized in that: The shell includes a limiting piece arranged in the notch, and the limiting piece is arranged oppositely on both sides of the copper column. The cover body includes relatively arranged cover body side walls and elastic clips, and each of the elastic clips is connected to one of the cover body side walls and is correspondingly installed on the limiting piece.

7. The BDU device according to any one of claims 1 to 3, characterized in that: The BDU device further comprises a blister cover, which is fixedly mounted on the side wall of the shell to seal the accommodating chamber.

8. The BDU device according to any one of claims 1 to 3, characterized in that: A mounting column is provided in the housing, the relay further comprises a mounting portion protruding from the main body, the BDU device comprises a second fastener, and the mounting column and the mounting portion are connected via the second fastener.

9. The BDU device according to any one of claims 1 to 3, characterized in that: The BDU device also includes a base, which includes a bottom plate, a surrounding plate and a connecting plate. Along the height direction of the base, the surrounding plate is arranged around the periphery of the bottom plate, and the bottom plate and the surrounding plate are connected by bending through the connecting plate. The bottom plate is provided with a second avoidance opening corresponding to the first avoidance opening, and the convex rib is passed through the second avoidance opening. There is a height difference between the connecting plate and the convex rib.

10. A battery pack, characterized in that: include: Box; The BDU device according to any one of claims 1 to 9, wherein the BDU device is installed in the box.

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