Battery distribution box and battery pack

Abstract

The utility model relates to the technical field of power batteries, and provides a battery distribution box and a battery pack. The battery distribution box comprises a shell, a BMS main board and a BDU assembly, wherein the BMS main board and the BDU assembly are arranged in the shell. The BDU assembly comprises a contactor and a copper bar assembly connected with a main contact of the contactor. A coil contact of the contactor is welded with the control bonding pad to be communicated with a low-voltage control circuit on the BMS main board, and a connecting piece on the copper bar assembly is welded with the acquisition bonding pad to be communicated with a high-voltage acquisition circuit on the BMS main board. According to the battery distribution box disclosed by the utility model, the BDU assembly and the BMS mainboard are integrated in the same shell, so that the occupation of the space in the battery pack can be reduced, the connector and the copper bar assembly in the BDU assembly are directly welded and connected with the bonding pad of the BMS mainboard, and the connection hidden danger caused by wiring harness connection is eliminated; and the connection strength and the connection reliability between the BMS mainboard and the BDU assembly are improved.

Description

Battery distribution box and battery pack Technical Field

[0001] This utility model relates to the field of power battery technology, and in particular to a battery distribution box. This utility model also relates to a battery pack having the aforementioned battery distribution box. Background Technology

[0002] With the rapid development of new energy vehicles and energy storage systems, the Battery Management System (BMS) and Battery Distribution Unit (BDU), as core components of power battery systems, directly affect the performance of the battery pack due to their integration and reliability. In existing technologies, the BMS mainboard and BDU components of the battery pack are usually designed separately, independently located inside the battery pack, and connected by wiring harnesses to achieve communication and control functions.

[0003] However, existing BMS motherboards and BDU components with a split design occupy a large amount of space within the battery pack, which is not conducive to the miniaturization design of the battery pack. At the same time, the wiring harness between the BMS motherboard and the BDU components will suffer from problems such as plug oxidation and wiring harness wear under long-term vibration and high and low temperature environments of the battery pack, resulting in insufficient reliability of the connection between the BMS motherboard and the BDU components, making it difficult to meet the stringent requirements of battery packs for safety and long service life. Summary of the Invention

[0004] In view of this, the present invention aims to provide a battery distribution box to reduce the space occupied within the battery pack and improve the connection reliability between the BMS motherboard and the BDU components.

[0005] To achieve the above objectives, the technical solution of this utility model is implemented as follows:

[0006] A battery distribution box includes a housing, and a BMS mainboard and BDU assembly disposed within the housing;

[0007] The BMS motherboard is provided with a control pad that is connected to the low-voltage control circuit and an acquisition pad that is connected to the high-voltage acquisition circuit.

[0008] The BDU assembly includes a contactor and a copper busbar assembly connecting the main contacts of the contactor;

[0009] The contactor has coil contacts extending toward the BMS mainboard, the coil contacts being soldered to the control pads, and the copper busbar assembly having connecting pieces extending toward the BMS mainboard, the connecting pieces being soldered to the acquisition pads.

[0010] Furthermore, the housing includes a housing body and a side cover covering one side of the housing body. The housing body and the side cover form an accommodating space. The BMS motherboard and the contactor are located in the accommodating space, and the copper busbar assembly is located outside the accommodating space. A snap-fit ​​structure is provided between the contactor and the housing body. The contactor is snapped into the accommodating space in a predetermined direction through the snap-fit ​​structure.

[0011] Furthermore, the snap-fit ​​structure includes a fixing piece that is cantilevered on the side wall of the housing body, and a snap-fit ​​protrusion on the contactor housing. The fixing piece is provided with a snap-fit ​​hole that is snapped into contact with the snap-fit ​​protrusion.

[0012] Furthermore, the side cover is provided with pads for supporting the BMS motherboard.

[0013] Furthermore, at least a portion of the copper busbar assembly is embedded inside the sidewall of the housing body.

[0014] Furthermore, the contactor includes a positive contactor and a negative contactor; the copper busbar assembly includes a battery positive copper busbar and a positive output copper busbar connected to the main contacts of the positive contactor, and a battery negative copper busbar and a negative output copper busbar connected to the main contacts of the negative contactor; the battery positive copper busbar and the battery negative copper busbar extend to the left and right ends of the housing body respectively; the BDU assembly also includes a main fuse connected in series on the battery positive copper busbar, and a shunt connected in series on the battery negative copper busbar.

[0015] Furthermore, the main body of the shell is provided with an open first cavity, a second cavity, and a third cavity, as well as a detachable first cover, a second cover, and a third cover disposed at the openings of the first cavity, the second cavity, and the third cavity; the first cavity is located above the contactor, and the second cavity and the third cavity are respectively disposed on the left and right sides of the first cavity; the connection ends of the positive output copper busbar and the negative output copper busbar extend into the first cavity, the main fuse is disposed in the second cavity, and the shunt is disposed in the third cavity.

[0016] Furthermore, the left and right ends of the shell body are provided with brackets, and each bracket is provided with a shock-absorbing structure; the connecting end of the positive copper busbar of the battery extending from the second cavity is attached to the top of one of the brackets, and the connecting end of the negative copper busbar of the battery extending from the third cavity is attached to the top of another bracket.

[0017] Compared with the prior art, this utility model has the following advantages:

[0018] The battery distribution box described in this invention integrates the BDU assembly and the BMS mainboard into the same housing, reducing the space occupied within the battery pack and improving the space utilization rate of the battery pack. Simultaneously, the connectors and copper busbar assemblies in the BDU assembly are directly soldered to the pads of the BMS mainboard, eliminating connection risks associated with wiring harness connections and improving the connection strength and reliability between the BMS mainboard and the BDU assembly. This contributes to improving the overall safety and lifespan of the battery pack.

[0019] Furthermore, the housing includes a main body and side covers. The contactor can be snapped into the receiving space via a snap-fit ​​structure to facilitate the installation and fixation of the contactor and BMS main board within the housing. The snap-fit ​​structure includes a retaining plate and snap-fit ​​protrusions on the contactor housing. The snap-fit ​​protrusions can push the retaining plate outward and embed into the snap-fit ​​holes to form a physical limit, improving the installation stability of the contactor and BMS main board within the receiving space.

[0020] In addition, a pad is provided on the side cover to support the BMS mainboard and prevent the side cover from bumping into the BMS mainboard, thus protecting the BMS mainboard. At least part of the copper busbar assembly is embedded inside the side wall of the main body of the casing, which can further reduce the space occupied by the copper busbar assembly within the casing. The BDU assembly also includes a main fuse connected in series on the positive copper busbar of the battery and a shunt connected in series on the negative copper busbar of the battery, which can play a role in circuit protection and monitoring the current of the battery pack, thereby ensuring the stable operation of the battery system and improving the safety of the battery pack.

[0021] Furthermore, by setting multiple independent cavities on the main body of the casing, the connection terminals of the positive and negative output copper busbars, as well as the main fuse and shunt, can be housed in separate cavities. This avoids cascading damage caused by component failure and improves maintenance efficiency. Supports are located at both ends of the main body of the casing to facilitate the installation of the battery distribution box inside the battery pack, and a shock-absorbing structure prevents damage to the battery distribution box due to vibration. Simultaneously, the supports provide stable support for the positive and negative copper busbars of the battery, improving the connection effect between the positive and negative copper busbars and the positive and negative terminals of the battery module.

[0022] Another objective of this invention is to provide a battery pack having a battery distribution box as described above.

[0023] Furthermore, the battery pack also includes a cooling and heat dissipation module; the copper busbar assembly includes a first copper busbar unit located inside the housing, and a second copper busbar unit at least partially exposed outside the housing; the cooling and heat dissipation module abuts against the exposed portion of the second copper busbar unit to form a heat exchange between the second copper busbar unit and the cooling and heat dissipation module.

[0024] The battery pack described in this utility model and / or the battery distribution box described above have the same technical effects as the prior art, and will not be described in detail here. Attached Figure Description

[0025] The accompanying drawings, which form part of this utility model, are used to provide a further understanding of the utility model. The illustrative embodiments of the utility model and their descriptions are used to explain the utility model and do not constitute an undue limitation of the utility model. In the drawings:

[0026] Figure 1 is a schematic diagram of the overall structure of the battery distribution box according to an embodiment of the present utility model;

[0027] Figure 2 is an exploded view of the battery distribution box according to an embodiment of the present invention;

[0028] Figure 3 is a structural schematic diagram of the BMS motherboard and BDU assembly according to an embodiment of the present invention;

[0029] Figure 4 is a structural schematic diagram of the BMS motherboard and BDU assembly described in an embodiment of the present invention from another perspective.

[0030] Figure 5 is an enlarged view of the position shown in Figure 4, A;

[0031] Figure 6 is a front view of the BMS motherboard according to an embodiment of the present invention;

[0032] Figure 7 is an exploded view of the casing described in an embodiment of the present invention;

[0033] Figure 8 is a schematic diagram of the shell body according to an embodiment of the present utility model;

[0034] Figure 9 is an enlarged view of the position shown in B in Figure 8;

[0035] Figure 10 is a schematic diagram of the bottom structure of the shell body according to an embodiment of the present invention;

[0036] Explanation of reference numerals in the attached figures:

[0037] 1. Shell; 101. Shell body; 102. Side cover;

[0038] 1011, Accommodation space; 1012a, Fixing piece; 1012b, Snap-fit ​​hole;

[0039] 1013a, First cavity; 1013b, First cover; 1014a, Second cavity; 1014b, Second cover; 1015a, Third cavity; 1015b, Third cover; 1016, Support; 1017, Shock-absorbing structure; 1021, Pad;

[0040] 2. BMS mainboard; 201. Control pad; 202. Data acquisition pad;

[0041] 3. Contactor; 3a. Positive contactor; 3b. Negative contactor; 301. Coil contact; 302. Snap-fit ​​protrusion;

[0042] 4. Copper busbar assembly; 401. Battery positive terminal copper busbar; 402. Positive output copper busbar; 403. Battery negative terminal copper busbar; 404. Negative output copper busbar;

[0043] 5. Connecting piece;

[0044] 6. Main fuse;

[0045] 7. Diverter;

[0046] 8. Insulating film; 9. Thermal pad. Detailed Implementation

[0047] It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0048] In the following description, specific details such as particular system architectures and techniques are set forth for illustrative purposes and not for limitation, in order to provide a thorough understanding of the embodiments of this application. However, those skilled in the art will understand that this application may also be implemented in other embodiments without these specific details. In other instances, detailed descriptions of well-known systems, apparatuses, circuits, and methods have been omitted so as not to obscure the description of this application with unnecessary detail.

[0049] In the description of this utility model, it should be noted that if terms such as "upper," "lower," "inner," or "outer" appear, indicating orientation or positional relationship, they are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, if terms such as "first" or "second" appear, they are also used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0050] Furthermore, in the description of this utility model, unless otherwise explicitly defined, the terms "installation," "connection," "joining," and "connector" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model in light of the specific circumstances.

[0051] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0052] Example 1

[0053] This embodiment relates to a battery distribution box. As shown in Figures 1, 2 and 3, the overall structure includes a housing 1, and a BMS mainboard 2 and a BDU assembly disposed within the housing 1.

[0054] The BMS mainboard 2 has a control pad 201 connected to the low-voltage control circuit and a data acquisition pad 202 connected to the high-voltage data acquisition circuit. The BDU assembly includes a contactor 3 and a copper busbar assembly 4 connecting the main contacts of the contactor 3. As shown in Figures 4 and 5, the contactor 3 has a coil contact 301 extending to the BMS mainboard 2, which is soldered to the control pad 201. The copper busbar assembly 4 has a connecting piece 5 extending to the BMS mainboard 2, which is soldered to the data acquisition pad 202.

[0055] As described above, by integrating the BDU component and BMS motherboard 2 into the same housing 1, compared to a separate design of the BDU component and BMS motherboard 2, the space occupied within the battery pack can be reduced, improving the space utilization rate of the battery pack. Simultaneously, the connectors and copper busbar components 4 in the BDU component are directly soldered to the pads of the BMS motherboard 2, eliminating the need for wiring harnesses and avoiding faults such as component oxidation and wiring harness wear. This provides better connection strength, thereby improving the connection reliability between the BMS motherboard 2 and the BDU component, and ultimately contributing to improved overall battery pack safety and lifespan.

[0056] Based on the above overview, specifically as shown in Figures 4, 5, and 6, in this embodiment, both the control pad 201 and the acquisition pad 202 are constructed as pad hole structures. The coil contact 301 of the contactor 3 and the connecting piece 5 on the copper busbar assembly 4 can be inserted into the pad holes and soldered to them, thereby improving the connection effect between the BMS mainboard 2 and the contactor 3 and the copper busbar assembly 4. Simultaneously, the coil contact 301, the connecting piece 5, and the pad holes can be connected using selective wave soldering, which facilitates the assembly of the BMS mainboard 2 with the contactor 3 and the copper busbar assembly 4 to a certain extent. In this embodiment, the low-voltage control circuit is used to control the operation of the contactor 3, while the high-voltage acquisition circuit is used to acquire data such as current and voltage on the copper busbar assembly 4.

[0057] In a specific implementation, the coil contacts 301 of the contactor 3 in this embodiment are configured as two, and the connecting pieces 5 are configured as multiple. The connecting pieces 5 are nickel or copper sheets and are laser-welded to designated positions on the copper busbar assembly 4.

[0058] In this embodiment, as shown in Figures 7 and 8, the housing 1 includes a main body 101 and a side cover 102 enclosing one side of the main body 101. The main body 101 and the side cover 102 form a receiving space 1011. The BMS main board 2 and the contactor 3 are located in the receiving space 1011, and the copper busbar assembly 4 is located outside the receiving space 1011. A snap-fit ​​structure is provided between the contactor 3 and the main body 101, and the contactor 3 is snapped into the receiving space 1011 in a predetermined direction through the snap-fit ​​structure. After the contactor 3 is soldered onto the BMS main board 2, the contactor 3 can be snapped into the receiving space 1011 through the snap-fit ​​structure, so as to facilitate the installation and fixation of the contactor 3 and the BMS main board 2 in the housing 1. At the same time, the cooperation between the side cover 102 and the main body 101 facilitates the maintenance of the contactor 3 and the BMS main board 2 in the housing 1. In specific implementation, the side cover 102 and the main body 101 are detachably connected through a snap-fit ​​interface.

[0059] Specifically, as shown in Figure 9, the snap-fit ​​structure of this embodiment includes a fixing piece 1012a cantilevered on the side wall of the housing body 101 and a snap-fit ​​protrusion 302 on the contactor 3 housing 1. The fixing piece 1012a is provided with a snap-fit ​​hole 1012b that snaps into the snap-fit ​​protrusion 302. When the contactor 3 is inserted into the receiving space 1011 in a preset direction, the fixing piece 1012a can be pushed outward by the snap-fit ​​protrusion 302 on the contactor 3 housing 1, causing the fixing piece 1012a to bend away from the contactor 3. Subsequently, as the contactor 3 is inserted into the receiving space 1011, the snap-fit ​​protrusion 302 can be embedded in the snap-fit ​​hole 1012b and hooked onto the fixing piece 1012a.

[0060] Thus, through the cooperation between the fixing piece 1012a and the snap-fit ​​protrusion 302, the snap-fit ​​protrusion 302 can push the fixing piece 1012a outward, thereby reducing the assembly resistance between the contactor 3 and the housing body 101. At the same time, the snap-fit ​​protrusion 302 is embedded in the snap-fit ​​hole 1012b to form a physical limit, preventing the contactor 3 from coming out of the receiving space 1011, thereby improving the installation stability of the contactor 3 and the BMS main board 2 in the receiving space 1011.

[0061] Furthermore, since the fixing piece 1012a is cantilevered, when the contactor 3 needs to be disassembled, the fixing piece 1012a can be pried up with a tool to expand it outward, allowing the snap-fit ​​protrusion 302 to disengage from the snap-fit ​​hole 1012b, thus separating the contactor 3 from the housing body 101 and facilitating non-destructive disassembly of the contactor 3. In specific implementation, snap-fit ​​protrusions 302 are provided on both opposite sides of the contactor 3 housing 1, and the fixing pieces 1012a are arranged in pairs on opposite sides of the contactor 3, corresponding to the snap-fit ​​protrusions 302. The paired arrangement of the fixing pieces 1012a further improves the fixing effect on the contactor 3.

[0062] In addition, since other electrical components are soldered onto the BMS motherboard 2, to prevent damage to the BMS motherboard 2 caused by collisions between the housing 1 and the BMS motherboard 2, a pad 1021 for supporting the BMS motherboard 2 is provided on the side cover 102 in this embodiment. The pad 1021 effectively supports the BMS motherboard 2, preventing collisions between the side cover 102 and the BMS motherboard 2, thus protecting the BMS motherboard 2. In a specific implementation, the pad 1021 is made of elastic material and is arranged in multiple units, with the aforementioned pad 1021 provided at each of the four corners of the BMS motherboard 2.

[0063] In this embodiment, at least a portion of the copper busbar assembly 4 is embedded inside the side wall of the housing body 101. It is understood that by embedding the copper busbar assembly 4 inside the side wall of the housing body 101, compared to directly placing the copper busbar assembly 4 in the receiving space 1011, the occupancy of the receiving space 1011 can be reduced, further improving the integration of the battery distribution box. Simultaneously, embedding the copper busbar assembly 4 inside the housing body 101 can prevent the copper busbar assembly 4 from shaking within the housing 1 and colliding with the housing 1, thereby improving the fixing effect of the copper busbar assembly.

[0064] In one specific implementation, the contactor 3 in this embodiment includes a positive contactor 3a and a negative contactor 3b. The copper busbar assembly 4 includes a battery positive copper busbar 401 and a positive output copper busbar 402 connected to the main contacts of the positive contactor 3a, and a battery negative copper busbar 403 and a negative output copper busbar 404 connected to the main contacts of the negative contactor 3b. The battery positive copper busbar 401 and the battery negative copper busbar 403 extend to the left and right ends of the housing body 101, respectively. The BDU assembly also includes a main fuse 6 connected in series with the battery positive copper busbar 401, and a shunt 7 connected in series with the battery negative copper busbar 403. The main fuse 6 can disconnect the battery positive copper busbar 401 when any battery module in the battery pack is overloaded or short-circuited, thus providing circuit protection. The shunt 7 can monitor the current of the battery pack in real time, thereby ensuring the stable operation of the battery system. The accurate data provided by shunt 7 not only helps prevent overload, but also provides diagnostic information when the system malfunctions, thereby further ensuring the normal operation of the battery pack and improving its safety.

[0065] Specifically, the housing body 101 of this embodiment is provided with an open first cavity 1013a, a second cavity 1014a, and a third cavity 1015a, as well as a detachable first cover 1013b, a second cover 1014b, and a third cover 1015b disposed at the openings of the first cavity 1013a, the second cavity 1014a, and the third cavity 1015a. The first cavity 1013a is located above the contactor 3, and the second cavity 1014a and the third cavity 1015a are respectively disposed on the left and right sides of the first cavity 1013a. The connection ends of the positive output copper busbar 402 and the negative output copper busbar 404 extend into the first cavity 1013a, the main fuse 6 is disposed in the second cavity 1014a, and the shunt 7 is disposed in the third cavity 1015a.

[0066] By setting multiple independent cavities on the main body 101, the connection terminals of the positive output copper busbar 402 and the negative output copper busbar 404, as well as the main fuse 6 and the shunt 7, can be housed in separate cavities. When a component in a certain cavity fails, because each cavity is independent, the hazards such as electric arc, high temperature, and smoke generated by the fault will be confined within that cavity, preventing cascading damage to other components. Furthermore, since these components are located in different cavities, maintenance personnel can open the corresponding cavity to replace the faulty component without disassembling the entire housing 1, thereby improving maintenance and repair efficiency.

[0067] In specific implementation, the first cover 1013b of this embodiment is hinged to the shell body 101 on one side, and the first cover 1013b, the second cover 1014b, and the third cover 1015b are all detachably connected to the shell body 101 by snap-fit, so that maintenance personnel can open the covers to disassemble and replace the components in the cavity. In addition, the third cavity 1015a of this embodiment communicates with the receiving space 1011 to provide communication connection between the splitter 7 and the BMS motherboard 2.

[0068] Finally, in this embodiment, brackets 1016 are provided at both ends of the main body 101, and each bracket 1016 is provided with a shock-absorbing structure 1017. The connecting end of the positive copper busbar 401 of the battery extending from the second cavity 1014a overlaps the top of one bracket 1016, and the connecting end of the negative copper busbar 403 of the battery extending from the third cavity 1015a overlaps the top of another bracket 1016. Through the setting of the brackets 1016, the battery distribution box can be installed in the battery pack housing 1. At the same time, the shock-absorbing structure 1017 on the bracket 1016 can reduce the transmission of vibration to the battery distribution box to a certain extent, and prevent the battery distribution box and its internal components from being damaged by vibration. In a specific implementation, the shock-absorbing structure 1017 is a shock-absorbing sleeve, which passes through the mounting holes of the bracket 1016. The fixing bolts can pass through the shock-absorbing sleeve to fasten the bracket 1016 to the battery pack. The upper and lower ends of the shock-absorbing sleeve have abutment ends, which abut against the fixing bolt and the battery pack respectively, in order to reduce the vibration transmission from the battery pack to the bracket 1016.

[0069] Meanwhile, the bracket 1016 provides stable support for the positive and negative copper busbars of the battery. Since the connecting ends of the copper busbars have a certain length, the support of the bracket 1016 prevents the connecting ends from sagging or deforming due to vibration or their own weight, thus affecting the connection between the positive and negative copper busbars of the battery and the positive and negative terminals of the battery module. Furthermore, the connection end overlapping the top of the bracket 1016 also serves to limit the connection, facilitating the connection between the positive and negative copper busbars of the battery and the positive and negative terminals of the battery module, and making maintenance easier for personnel.

[0070] In specific implementation, the second cover 1014b and the third cover 1015b of this embodiment can extend and cover the connection ends of the positive and negative copper busbars of the battery, respectively, so as to protect the positive and negative copper busbars of the battery.

[0071] In summary, the battery distribution box in this embodiment, by integrating the BDU assembly and the BMS mainboard 2 into the same housing 1, reduces the space occupied within the battery pack and improves the space utilization rate of the battery pack. Simultaneously, the connectors and copper busbar assemblies 4 in the BDU assembly are directly soldered to the pads of the BMS mainboard 2, eliminating connection risks associated with wiring harness connections and improving the connection strength and reliability between the BMS mainboard 2 and the BDU assembly. This contributes to improving the overall safety and lifespan of the battery pack.

[0072] Example 2

[0073] This embodiment relates to a battery pack. In terms of overall structure, the battery pack of this embodiment is provided with a battery distribution box as described in Embodiment 1.

[0074] In this embodiment, the battery pack, through the aforementioned battery distribution box arrangement, reduces the space occupied by the BMS motherboard 2 and BDU components within the battery pack, improving space utilization and contributing to increased energy density. Simultaneously, the BMS motherboard 2 and BDU components exhibit better connectivity, enhancing the overall safety and lifespan of the battery pack and extending its maintenance cycle.

[0075] As a specific implementation, the battery pack in this embodiment also includes a cooling and heat dissipation module. The copper busbar assembly 4 includes a first copper busbar unit located within the housing 1, and a second copper busbar unit at least partially exposed outside the housing 1. The cooling and heat dissipation module abuts against the exposed portion of the second copper busbar unit to facilitate heat exchange between the second copper busbar unit and the cooling and heat dissipation module. The second copper busbar unit includes a positive output copper busbar 402, a negative output copper busbar 404, a battery negative copper busbar 403, and a contactor 3 side of the battery positive copper busbar 401. By abutting against the exposed portion of the second copper busbar unit, the cooling and heat dissipation unit can cool the copper busbar assembly 4, thereby achieving cooling and heat dissipation of the BDU assembly, reducing the operating temperature of the BDU assembly, and preventing performance degradation due to overheating.

[0076] In a specific implementation, as shown in Figure 2, the cooling and heat dissipation unit can be a liquid cooling plate inside the battery pack. To ensure the insulation between the copper busbar assembly 4 and the cooling and heat dissipation unit, an insulating film 8 and a thermal pad 9 are provided between the exposed part of the second copper busbar unit and the cooling and heat dissipation unit in this embodiment. The insulating film 8 is set to abut against the exposed part, which improves the heat exchange effect between the copper busbar assembly 4 and the cooling and heat dissipation unit while ensuring the insulation between them.

[0077] Furthermore, as shown in Figure 10, in this embodiment, the contact connection portions of the battery positive and negative copper busbars and the positive and negative output copper busbars 404, which connect to the main contacts of the contactor 3, are exposed outside the housing 1. A countersunk portion is formed at the contact connection portion, and bolt holes for connecting the main contacts are provided on the countersunk portion. After the contactor 3 is snapped into the receiving space 1011, the battery positive and negative copper busbars and the positive and negative output copper busbars 404 can be connected to the corresponding main contacts of the contactor 3 via bolts from the outside of the housing 1, facilitating the connection between the contactor 3 and the copper busbar assembly 4.

[0078] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A battery distribution box, characterized in that: The system includes a housing, and a BMS mainboard and a BDU assembly disposed within the housing. The BMS mainboard has a control pad connected to a low-voltage control circuit and a data acquisition pad connected to a high-voltage data acquisition circuit. The BDU assembly includes a contactor and a copper busbar assembly connecting the main contacts of the contactor. The contactor has a coil contact extending toward the BMS mainboard, the coil contact being soldered to the control pad. The copper busbar assembly has a connecting piece extending toward the BMS mainboard, the connecting piece being soldered to the data acquisition pad.

2. The battery distribution box according to claim 1, characterized in that: The housing includes a main body and a side cover covering one side of the main body. The main body and the side cover form an accommodating space. The BMS main board and the contactor are located in the accommodating space, and the copper busbar assembly is located outside the accommodating space. A snap-fit ​​structure is provided between the contactor and the main body. The contactor is snapped into the accommodating space in a predetermined direction through the snap-fit ​​structure.

3. The battery distribution box according to claim 2, characterized in that: The snap-fit ​​structure includes a fixing piece that is cantilevered on the side wall of the housing body, and a snap-fit ​​protrusion on the contactor housing. The fixing piece is provided with a snap-fit ​​hole that is snapped and connected to the snap-fit ​​protrusion.

4. The battery distribution box according to claim 2, characterized in that: The side cover is provided with pads for supporting the BMS motherboard.

5. The battery distribution box according to claim 2, characterized in that: At least a portion of the copper busbar assembly is embedded inside the side wall of the housing body.

6. The battery distribution box according to any one of claims 2 to 5, characterized in that: The contactor includes a positive contactor and a negative contactor; the copper busbar assembly includes a battery positive copper busbar and a positive output copper busbar connected to the main contacts of the positive contactor, and a battery negative copper busbar and a negative output copper busbar connected to the main contacts of the negative contactor; the battery positive copper busbar and the battery negative copper busbar extend to the left and right ends of the housing body respectively; the BDU assembly also includes a main fuse connected in series on the battery positive copper busbar, and a shunt connected in series on the battery negative copper busbar.

7. The battery distribution box according to claim 6, characterized in that: The main body of the housing is provided with an open first cavity, a second cavity, and a third cavity, as well as a detachable first cover, a second cover, and a third cover located at the openings of the first cavity, the second cavity, and the third cavity; the first cavity is located above the contactor, and the second cavity and the third cavity are respectively located on the left and right sides of the first cavity; the connection ends of the positive output copper busbar and the negative output copper busbar extend into the first cavity, the main fuse is located in the second cavity, and the shunt is located in the third cavity.

8. The battery distribution box according to claim 7, characterized in that: The main body of the shell is provided with brackets at its left and right ends, and each bracket is provided with a shock-absorbing structure; the connecting end of the positive copper busbar of the battery extending from the second cavity is attached to the top of one of the brackets, and the connecting end of the negative copper busbar of the battery extending from the third cavity is attached to the top of another bracket.

9. A battery pack, characterized in that: The battery pack has a battery distribution box as claimed in any one of claims 1 to 8.

10. The battery pack according to claim 9, characterized in that: The battery pack also includes a cooling and heat dissipation module; the copper busbar assembly includes a first copper busbar unit located inside the housing and a second copper busbar unit at least partially exposed outside the housing; the cooling and heat dissipation module abuts against the exposed portion of the second copper busbar unit to form a heat exchange between the second copper busbar unit and the cooling and heat dissipation module.

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