Busbar structure

Abstract

The utility model relates to the technical field of cleaning tools, and provides a busbar structure which comprises a wrapping piece, a busbar assembly and a clamping table, and the clamping table forms a creepage step in a first direction. And the creepage gap between the copper bars is further increased due to the creepage step design added on the clamping table. The creepage steps are added, so that the insulation performance between the copper bars is enhanced, and the influence of external factors on an electrical system is reduced. In a high-voltage environment, especially in a new energy automobile battery and a motor driving system, the creepage phenomenon is easy to aggravate, and the insulation safety of the system can be remarkably improved through the step design.

Description

TECHNICAL FIELD

[0001] The utility model relates to cleaning tool technical field, especially in a kind of busbar structure. BACKGROUND

[0002] As an important electrical connection component, injection molding copper bar is widely used in the electrical system of new energy vehicles, especially in battery management system (BMS) and electric drive system (EDS), which plays a key role in transmitting current and connecting electrical components. Copper bar has been widely used in new energy vehicles due to its excellent electrical conductivity and good processability.

[0003] Since the injection molding copper bar usually adopts non-standardized structure and needs to be precisely positioned during production, a fixing member is arranged between different copper bars during the injection molding process. The fixing member between the copper bars may become a potential creepage path. In a high-voltage working environment, when current passes through the copper bar, the fixing member between the copper bars may cause current to creep along the surface of the fixing member due to factors such as material properties and surface contamination. SUMMARY

[0004] In view of the above-mentioned shortcomings of the prior art, the purpose of the utility model is to provide a busbar structure to improve safety.

[0005] To achieve the above-mentioned purpose and other related purposes, the utility model provides a busbar structure, comprising:

[0006] A wrapping member is provided with a receiving cavity inside, and the wrapping member is composed of a base material made of insulating material;

[0007] A busbar assembly is provided, which includes U-phase copper bars, V-phase copper bars and W-phase copper bars arranged at intervals along a first direction. The bodies of the U-phase copper bars, the V-phase copper bars and the W-phase copper bars are arranged in the receiving cavity, and the pins of the U-phase copper bars, the V-phase copper bars and the W-phase copper bars are led out from the receiving cavity to the outside of the wrapping member;

[0008] A clamping table is provided in the receiving cavity, and the clamping table is fixed between at least two of the U-phase copper bars, the V-phase copper bars and the W-phase copper bars;

[0009] Wherein, the clamping table is provided with a creepage step in the first direction.

[0010] In an optional embodiment of the utility model, the clamping table includes a first circular table and a second circular table arranged along the first direction, and the radii of the first circular table and the second circular table are different to form the creepage step.

[0011] In an optional embodiment of the utility model, the second circular table is provided with a clamping column, the body of the V-phase copper bar and the W-phase copper bar is provided with a clamping hole along the first direction, and the clamping column is inserted into the clamping hole.

[0012] In an optional embodiment of the utility model, the radius of the first circular table is greater than the radius of the second circular table, and the radius of the second circular table is greater than the radius of the clamping column.

[0013] In an optional embodiment of the utility model, the difference between the radius of the first circular table and the radius of the second circular table is greater than 6mm.

[0014] In an optional embodiment of the utility model, a first layer of clamping tables is arranged between the body of the U-phase copper bar and the W-phase copper bar, a second layer of clamping tables is arranged between the body of the W-phase copper bar and the V-phase copper bar, and the first layer of clamping tables and the second layer of clamping tables each have a plurality of clamping tables.

[0015] In an optional embodiment of the utility model, the first layer of clamping tables and the second layer of clamping tables are staggered in a second direction, and the second direction is the length extension direction of the body of the U-phase copper bar.

[0016] In an optional embodiment of the utility model, the body of the U-phase copper bar, the V-phase copper bar and the W-phase copper bar is provided with a through hole along the first direction, and part of the base material of the wrapping piece is embedded in the through hole.

[0017] In an optional embodiment of the utility model, the through holes on the body of the U-phase copper bar, the V-phase copper bar and the W-phase copper bar are aligned with each other.

[0018] In an optional embodiment of the utility model, the busbar assembly further comprises a grounding copper bar arranged in the accommodating cavity, the grounding copper bar is arranged in the first direction and is spaced apart from the U-phase copper bar, the V-phase copper bar and the W-phase copper bar, and the clamping table is arranged corresponding to the grounding copper bar.

[0019] The utility model discloses a kind of busbar structures, and the insulating performance between copper bar is strengthened by the design of the creep step increased on clamping table, reduces the influence of external factors on electrical system. In high-pressure environment, especially in new energy automobile battery and motor drive system, the phenomenon of creeping is prone to aggravate, and step design can significantly improve the insulation safety of system. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical scheme of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiment description. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of these drawings.

[0021] Figure 1 It is a perspective structural schematic view of the busbar assembly in an embodiment of the present application.

[0022] Figure 2 It is a perspective structural schematic view of the busbar structure in an embodiment of the present application.

[0023] Figure 3 It is another perspective structural schematic view of the busbar assembly in an embodiment of the present application.

[0024] Figure 4 It is a structural schematic view of the grounding copper bar in an embodiment of the present application.

[0025] Figure 5 It is a structural schematic view of the clamping table in an embodiment of the present application.

[0026] The figure mark explanation; 10, the wrapping piece; 20, busbar assembly; 21, U-phase copper bar; 22, V-phase copper bar; 23, W-phase copper bar; 24, clamping hole; 25, grounding copper bar; 26, through hole; 30, clamping table; 31, first circular table; 32, second circular table; 33, clamping column. DETAILED DESCRIPTION

[0027] The embodiments of the present application will be described below through specific concrete examples, and those skilled in the art can easily understand other advantages and effects of the present application from the content disclosed in the present specification. The present application can also be implemented or applied through other different concrete embodiments, and each detail in the present specification can be modified or changed based on different viewpoints and applications without departing from the spirit of the present application. It should be noted that the following embodiments and features in the embodiments can be combined with each other without conflict.

[0028] It should be noted that the drawings provided in the following embodiments only illustrate the basic concept of the present application in a schematic manner, and only the components related to the present application are shown in the drawings, not the number, shape and size of the components during actual implementation. The shape, number and proportion of each component during implementation can be arbitrarily changed, and the component layout pattern can also be more complex.

[0029] With the rapid development of new energy vehicles, lightweight technology has become one of the core technologies in the industry. In the automotive industry, the goal of lightweighting the vehicle body not only improves the energy efficiency of the vehicle, but also enhances the vehicle's endurance, thereby meeting the increasingly stringent environmental standards and consumer demand for high efficiency and long endurance. In this context, how to effectively reduce the weight of the vehicle body while maintaining the safety and functionality of the vehicle has become a major challenge for automakers.

[0030] As an important electrical connection component, injection molded copper bars are widely used in the electrical systems of new energy vehicles, especially in the battery management system (BMS) and electric drive system (EDS), playing a key role in transmitting current and connecting electrical components. Copper bars have been widely used in new energy vehicles due to their excellent electrical conductivity and good processability. However, with the development of electric vehicle technology, the demand for lightweighting the vehicle body is increasing, and the use of injection molded copper bars has inevitably become an important way to solve the problem of lightweighting.

[0031] The design and production process of injection molded copper bars face a series of technical challenges. First, the structure of injection molded copper bars is usually long and slender, and needs to withstand high current load and mechanical stress during use, so the structural design must ensure good voltage resistance, electrical conductivity and mechanical strength. However, since injection molded copper bars usually use non-standardized structures and require precise positioning during production, the copper bars are prone to deformation during injection molding, resulting in product quality problems, especially during the molding process, due to the lack of effective positioning and constraints, the copper bars may deviate from their positions, affecting the assembly accuracy of the final busbar assembly 20.

[0032] In addition, the integration of injection molded copper bars has become a new trend in current technology development. With the increasing demand for electrical integration and spatial layout of new energy vehicle systems, the busbar, as a key component for transmitting electrical signals and current from the battery module to the electric motor, must have high integration, compact structure and reliable performance. However, during the integration process with other components, injection molded copper bars are prone to deformation and copper bar leakage problems during the injection molding process, resulting in reduced voltage resistance of the product, which may eventually result in breakdown or electrical failure. Therefore, during the design and manufacturing process of injection molded copper bars, how to solve the problems of copper bar positioning, structural stability and voltage breakdown resistance has become a key technical problem that needs to be solved in the industry.

[0033] Currently, although some technical solutions have been proposed to improve the design and manufacturing of injection molded copper bars, how to balance the relationship between lightweighting, integration and high reliability remains one of the technical bottlenecks in the electric vehicle field. Therefore, developing a process and structure solution that can effectively prevent deformation of injection molded copper bars, ensure accurate positioning and improve voltage breakdown resistance performance has important practical significance and broad market prospects.

[0034] To solve the above problems, such as Figures 1-5 As shown, this utility model proposes a busbar structure, including a package 10, a busbar assembly 20, and a snap-fit ​​platform 30.

[0035] The package 10 has a receiving cavity inside. The package 10 is made of an insulating material substrate, specifically an injection-molded substrate. The package 10 is essentially the plastic outer shell of the injection-molded copper busbar. The package 10 primarily serves a protective function; it is a copper busbar shell formed through an injection molding process, made of insulating material, and capable of encasing the copper busbar assembly. The package 10 has a receiving cavity that can accommodate the bodies of the U-phase, V-phase, and W-phase copper busbars 23. The material of the package 10 is typically selected from substrates with good insulation properties to ensure the safety of the electrical system. As an insulating layer, the package 10 effectively isolates the copper busbar from direct contact with the external environment, avoiding potential short circuits, electrical interference, or electric shocks caused by exposed copper busbars. It enhances the system's insulation, especially under high-voltage current environments, effectively preventing electrical faults.

[0036] Busbar assembly 20 includes U-phase copper busbars 21, V-phase copper busbars 22, and W-phase copper busbars 23 spaced apart along a first direction. The bodies of the U-phase copper busbars 21, V-phase copper busbars 22, and W-phase copper busbars 23 are disposed in the receiving cavity, and the pins of the U-phase copper busbars 21, V-phase copper busbars 22, and W-phase copper busbars 23 extend from the receiving cavity to the outside of the enclosure 10. Busbar assembly 20 is mainly responsible for current distribution and transmission. Through the precise arrangement of the U, V, and W phase copper busbars, busbar assembly 20 can effectively transmit and distribute current, ensuring that the electrical system can smoothly conduct current during high-power operation, avoiding problems such as voltage instability or current overload. The copper busbars have good conductivity, ensuring efficient current transmission and reducing energy loss caused by current transmission. The three-phase copper busbar design can effectively balance the current load and improve the reliability of the electrical system, especially in high-voltage and high-current applications, preventing electrical system failures due to uneven load or overload.

[0037] A clamping platform 30 is arranged in the accommodating cavity, and the clamping platform 30 is fixed between at least two of the U-phase copper bar 21, the V-phase copper bar 22 and the W-phase copper bar 23. The clamping platform 30 is formed with a creepage step in the first direction. The design of the clamping platform 30 enables the U-phase, V-phase and W-phase copper bars 23 to be stably supported and positioned, avoiding displacement or mispositioning of the copper bars due to injection pressure during product injection molding, thereby preventing electrical faults caused by excessively small gaps between the copper bars. This structure effectively improves the stability of the entire assembly and ensures stable transmission of electrical current. The creepage step on the clamping platform 30 can effectively increase the creepage gap between the copper bars. Creepage refers to the flow of electrical current along a non-conductive path, which can cause safety hazards such as short circuits, breakdowns or electrical arcs in electrical systems. By increasing the step, the creepage path is lengthened, thereby avoiding direct electrical contact between the copper bars and reducing the risk of electrical faults.

[0038] During manufacturing, the clamping platform 30 is formed by an injection molding process. During the injection molding process, the clamping platform 30 will be placed in a mold, and the slots will precisely match the shape of the copper bars. To ensure accurate positioning of the copper bars, the slots on the clamping platform 30 need to have appropriate dimensions and shapes so that the copper bars can be securely clamped on the clamping platform 30. The mold with the copper bar assembly and clamping platform 30 already placed is then subjected to injection molding again, using a plastic material to wrap the entire copper bar assembly and clamping platform 30. To ensure the mechanical strength and electrical performance of the housing, an engineering plastic with good insulation and high temperature resistance is usually used, such as polyamide (PA) or thermoplastic polyurethane (TPU).

[0039] As shown in Figure 5 The clamping platform 30 includes a first circular platform 31 and a second circular platform 32 arranged in the first direction, and the radii of the first circular platform 31 and the second circular platform 32 are different to form the creepage step. The design of the creepage step increases the path of the electrical current flowing on the surface of the assembly by forming a structure with different radii between the two circular platforms. In this way, when the electrical current flows from one point to another, it must pass through a longer path, effectively increasing the creepage distance. Creepage distance refers to the shortest path that electrical current flows along the surface from one electrode to another, which is crucial for the safety of electrical equipment. In electrical systems, increasing the creepage distance can effectively reduce the risk of external leakage or short circuit of electrical current, especially in high voltage environments. The creepage step design makes the electrical system more resistant to external interference and faults.

[0040] As shown in Figure 5As shown, the second circular table 32 is provided with a clamping column 33, and the bodies of the V-phase copper bar 22 and the W-phase copper bar 23 are provided with clamping holes 24 in the first direction, and the clamping column 33 is inserted into the clamping hole 24. The clamping column 33 is inserted into the clamping hole 24 on the body of the copper bar to form a mechanical locking mode, so that the connection between the clamping table 30 and the copper bar is more firm and accurate. This design ensures that the copper bar always remains in the predetermined position during the entire use process, avoiding displacement or loosening of the copper bar due to vibration or external force interference. After the clamping column 33 is inserted into the clamping hole 24, the position of the copper bar on the clamping table 30 is accurately locked, which not only ensures the stability of the structure, but also ensures the accurate butt joint between the copper bar and the clamping table 30. This accuracy is crucial to ensure the subsequent electrical connection and component stability.

[0041] As shown in the drawings, Figure 5 The radius of the first circular table 31 is greater than the radius of the second circular table 32, and the radius of the second circular table 32 is greater than the radius of the clamping column 33. The radius of the first circular table 31 is greater than the radius of the second circular table 32, and the radius of the second circular table 32 is greater than the radius of the clamping column 33, which forms a three-dimensional gradually expanding structure, making the mechanical structure of the entire clamping table 30 and the assembly more stable. The first circular table 31 provides a larger support surface, the second circular table 32 serves as a transition layer, and the clamping column 33 serves as a connection and locking part. This layer-by-layer increasing structure design can effectively disperse external forces and reduce deformation or damage of the structure due to external impact or pressure changes.

[0042] In an optional embodiment of the utility model, the difference between the radius of the first circular table 31 and the radius of the second circular table 32 is greater than 6mm. Specifically, the difference between the radius of the first circular table 31 and the radius of the second circular table 32 is greater than 6.3mm. The design of a larger radius difference can provide a stronger locking effect and prevent parts from loosening due to external forces. Especially in high-load or frequent-motion environments, a larger difference can effectively prevent relative displacement between components and ensure normal operation of the equipment.

[0043] As shown in the drawings, Figure 1 , 3As shown, the U-phase copper bar 21 and the body of the W-phase copper bar 23 are provided with a first layer of clamping platforms 30, and the W-phase copper bar 23 and the body of the V-phase copper bar 22 are provided with a second layer of clamping platforms 30. Both the first layer and the second layer of clamping platforms 30 have multiple clamping platforms 30. Both the first layer and the second layer of clamping platforms 30 are provided with multiple clamping points, which means that the connection between the U, W, and V-phase copper bars 22 is more stable and reliable. The multiple clamping platforms 30 can disperse the force applied to the connecting components, so that each clamping point bears less stress, thereby avoiding excessive burden on individual clamping points and reducing the risk of damage to the clamping points due to excessive stress. The multiple clamping points can effectively prevent loosening or misalignment between the copper bars due to vibration, temperature changes, or other external forces. Even if a clamping point is affected, other clamping points can still maintain the stability of the connection, thereby improving the overall anti-loosening capability.

[0044] As shown in Figure 1 , 3 , the first layer of clamping platforms 30 and the second layer of clamping platforms 30 are misaligned in the second direction, which is the length extension direction of the body of the U-phase copper bar 21. By misaligning the first layer of clamping platforms 30 and the second layer of clamping platforms 30 in the second direction, the force concentration phenomenon between the two clamping platforms 30 can be effectively avoided. After misalignment, the stress borne by each clamping point is dispersed, reducing the problem of structural fatigue or deformation caused by load concentration. This misalignment design disperses the stress of the body of the U-phase copper bar 21 to multiple contact points and different directions, optimizing the mechanical properties of the entire copper bar system and avoiding excessive local stress, thereby improving the stability of the copper bar under high load conditions.

[0045] As shown in Figure 1 , 3 , the bodies of the U-phase copper bar 21, the V-phase copper bar 22, and the W-phase copper bar 23 are provided with through holes 26 along the first direction, and part of the base material of the wrapping member 10 is embedded in the through holes 26. After the through holes 26 are opened, the base material of the wrapping member 10 can be embedded into the through holes 26, making the combination of the copper bar and the plastic more compact. Especially with the design of multiple through holes 26, the contact surface and bonding points are increased, thereby improving the bonding force between the copper bar and the plastic. This structure can effectively prevent the copper bar and the plastic wrapping member 10 from separating or loosening due to external forces or vibration. The through hole 26 design not only increases the bonding area but also forms a mechanical connection between the plastic and the copper bar. In this way, under the action of external forces, the combination between the copper bar and the plastic wrapping member 10 will not easily break or come off, enhancing the tensile strength and tear resistance of the system.

[0046] In an optional embodiment of the utility model, the through holes 26 on the bodies of the U-phase copper bars 21, the V-phase copper bars 22 and the W-phase copper bars 23 are aligned with each other. The alignment of the through holes 26 means that the stress on each copper bar is more uniform. By ensuring the alignment of the through holes 26, a more stable structure can be formed under stress, reducing deformation or damage caused by uneven distribution of force. Especially in long-term work or high-load environments, the alignment of the through holes 26 can avoid excessive concentration of stress in a certain direction, thereby ensuring the stability of the copper bars in use. When multiple-point docking of the copper bars, if the through holes 26 are aligned, local stress concentration caused by misalignment of hole positions can be avoided, further reducing the risk of deformation or cracking.

[0047] As shown in Figure 4 The busbar assembly 20 further includes a grounding copper bar 25 arranged in the accommodating cavity, the grounding copper bar 25 is arranged in the first direction and is spaced apart from the U-phase copper bar 21, the V-phase copper bar 22 and the W-phase copper bar 23, and the clamping table 30 is arranged corresponding to the grounding copper bar 25. The grounding copper bar 25 is a key component in the busbar system and undertakes the grounding function of the electrical system. By arranging the grounding copper bar 25 beside the U-phase, V-phase and W-phase copper bars 23 and spacing them, it can be ensured that when an electrical fault occurs in the entire system, the excess current can be quickly introduced into the ground, thereby avoiding damage to electrical equipment caused by excessive current. The design of the grounding copper bar 25 ensures that when an electrical fault such as electrical leakage or short circuit occurs, the current can be quickly cut off and safe grounding can be achieved, reducing the risk of electrical fire or equipment damage.

[0048] In summary, the utility model discloses a busbar structure, through the joint station 30 in the corresponding joint slot of U, V, W three-phase copper bar to support and position many copper bars, ensure that copper bar does not produce deviation or deformation in the injection molding process because of injection molding pressure. The design of joint station 30 ensures the compliance of copper bar gap, avoids the voltage bearing capacity shortage caused by too small gap. This can significantly improve the voltage resistance of busbar, prevent breakdown caused by abnormal current increase, reduce the occurrence of short circuit or other safety accidents in electrical system, and protect the overall safety and stability of vehicle. The creepage step design added on the joint station 30 further increases the creepage gap between copper bars. The increase of creepage step strengthens the insulation performance between copper bars and reduces the influence of external factors on electrical system. In high voltage environment, especially in new energy vehicle battery and electric motor drive system, the creepage phenomenon is easy to intensify, and the step design can significantly improve the insulation safety of system. Through the positioning groove design of joint station 30, it can ensure that the copper bar remains stable during the injection molding process, and reduce the risk of copper bar misplacement or deformation caused by injection molding pressure. This not only improves the assembly accuracy of finished product, but also improves the overall consistency and reliability of busbar assembly 20, and ensures stable performance in long-term use. After optimizing the design of joint station 30, the production defects caused by copper bar deformation, insufficient gap and other problems can be effectively reduced, the cost of subsequent product testing and maintenance can be reduced, and the production efficiency can be improved.

[0049] The above embodiments only illustrate the principles and effects of the present application, and are not intended to limit the present application. Any person skilled in the art can modify or change the above embodiments without departing from the spirit and scope of the present application. Therefore, all equivalent modifications or changes made by those skilled in the art without departing from the spirit and technical idea disclosed by the present application should be covered by the claims of the present application.

[0050] In the description herein, many specific details are provided, such as examples of components and / or methods, to provide a thorough understanding of embodiments of the present application. One skilled in the relevant art will recognize, however, that the application embodiments can be practiced without one or more of the specific details, or with other elements, systems, components, methods, materials, parts, and the like. In other instances, well-known structures, materials, or operations are not shown or described in detail in order to avoid obscuring aspects of the application embodiments.

[0051] References in the specification to "one embodiment," "an embodiment," or "the

[0052] It is also to be understood that one or more of the elements of the drawings shown can also be implemented in a more separated or more integrated manner, or even removed in certain cases, and that the various

[0053] In addition, unless explicitly stated otherwise, any arrows shown in the drawings are to be considered as exemplary, and not limiting. Further, unless specifically stated otherwise, the use of the term "or" in this document generally means "and / or", that is unless the context clearly indicates otherwise. In addition, the combination of components or steps, where contemplated, is also to be considered as having been indicated, where the terms are not clearly seen to provide separate or combined capabilities.

[0054] As used in the description of the application and throughout the claims that follow, unless otherwise indicated the use of "a" or "an" includes plural referents. Likewise, as used in the description of the application and throughout the claims that follow, unless otherwise indicated the use of "in" means "in" and "on."

[0055] The above description of the illustrated embodiments of the application (including what is described in the abstract) is not intended to be exhaustive or to limit the application to the precise forms disclosed. While specific embodiments of, and examples for, the application are described herein for illustrative purposes, various equivalent modifications are possible within the spirit and scope of the application, as those skilled in the relevant art will recognize and appreciate. As indicated, these modifications can be made to the above described embodiments and yet the application will remain within the scope of the application.

[0056] The systems and methods have been described herein in general terms as helpful to an understanding of the details of the application. In addition, various specific details have been set forth in order to provide a general understanding of the overall structure and operation of embodiments of the present application. It will be appreciated, however, that implementations of the present application can be practiced without some or all of the specific details set forth herein, or with other apparatus, systems, assemblies, methods, components, materials, parts and / or the like. In other instances, well known structures, materials, and / or operations have not been shown or described in detail in order to avoid obscuring aspects of the embodiments of the present application.

[0057] Thus, although the present application has been described in reference to specific embodiments thereof, many changes in the details thereof will be suggested to those skilled in the art, and it is intended in the application to encompass all such changes and modifications that fall within the scope of the appended claims. Accordingly, various modifications can be made in carrying out the application described herein without departing from the scope and spirit of the application. Therefore, the scope of the present application is not to be limited to the specific embodiments discussed above but only by the claims that follow.

Claims

1. A busbar structure, characterized by, The utility model relates to a kind of copper bar assembly, including: wrapping piece, the accommodating cavity is arranged in the wrapping piece, the wrapping piece is made of base material of insulating material;Busbar assembly, the U-phase copper bar, V-phase copper bar and W-phase copper bar are arranged at intervals along the first direction, the body of the U-phase copper bar, the V-phase copper bar and the W-phase copper bar is arranged in the accommodating cavity, the pin of the U-phase copper bar, the V-phase copper bar and the W-phase copper bar is led out from the accommodating cavity to the outside of the wrapping piece;Clamping table, the clamping table is arranged in the accommodating cavity, and the clamping table is fixed between at least two of the U-phase copper bar, the V-phase copper bar and the W-phase copper bar;Wherein, the clamping table is constituted with creepage step in the first direction. The clamping table includes first circular table and second circular table arranged along the first direction, and the radii of the first circular table and the second circular table are different to constitute the creepage step. The second circular table is provided with a clamping column, and the bodies of the V-phase copper bar and the W-phase copper bar are provided with clamping holes in the first direction. The radius of the first circular table is greater than the radius of the second circular table, and the radius of the second circular table is greater than the radius of the clamping column. The difference between the radius of the first circular table and the radius of the second circular table is greater than 6 mm.

2. A busbar structure according to claim 1, wherein The bodies of the U-phase copper bar and the W-phase copper bar are provided with a first layer of clamping tables, and the bodies of the W-phase copper bar and the V-phase copper bar are provided with a second layer of clamping tables.

3. A busbar arrangement according to claim 2, characterized in that The first layer of clamping tables and the second layer of clamping tables are misaligned in the second direction, and the second direction is the length extension direction of the body of the U-phase copper bar.

4. A busbar structure according to claim 3, wherein The bodies of the U-phase copper bar, the V-phase copper bar and the W-phase copper bar are provided with through holes in the first direction, and part of the base material of the wrapping piece is embedded in the through holes.

5. The busbar structure of claim 2, wherein The through holes on the bodies of the U-phase copper bar, the V-phase copper bar and the W-phase copper bar are aligned with each other.

6. The busbar structure of claim 1, wherein The busbar assembly further includes a grounding copper bar arranged in the accommodating cavity, and the grounding copper bar is arranged at intervals with the U-phase copper bar, the V-phase copper bar and the W-phase copper bar in the first direction, and the clamping table is arranged corresponding to the grounding copper bar.

7. A busbar structure according to claim 6, wherein ​ 8. The busbar structure of claim 1, wherein ​ 9. A busbar structure according to claim 8, wherein ​ 10. The busbar structure of claim 1, wherein ​

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