Busbar structure

Abstract

The application relates to a busbar structure, which comprises a busbar body and a clamping piece. The busbar body comprises a first insulating film, a positive plate, a second insulating film, a negative plate and a third insulating film which are stacked along a first direction. The positive plate and the negative plate are respectively connected with the clamping piece. The clamping piece is provided with a connecting end for connecting with a power device. The peripheral side wall of the clamping piece is wrapped with a first insulating layer. By wrapping the peripheral side wall of the clamping piece with the first insulating layer, the creepage distance between adjacent clamping pieces is increased at the clamping position of the busbar structure and the power device, the safety specification requirement is met, the risks of electrical breakdown, leakage between adjacent clamping pieces and arc discharge are reduced, and the electrical safety is improved.

Description

Technical Field

[0001] This application relates to the field of power electronics technology, specifically to a busbar structure. Background Technology

[0002] In the field of power electronics and industrial control, busbar structure, as a key circuit connection component, has significant advantages such as excellent repeatable electrical performance, low inductive impedance, and strong anti-interference ability, and is therefore widely used in various industrial frequency converters.

[0003] In the busbar structure, the lap joint is a key transition component for realizing electrical connection with power devices such as power modules and capacitors. However, due to the inherent structural dimensions between the two electrodes of the power device itself, the spacing between adjacent lap joints often fails to meet safety specifications when lap joints are connected to the power device. This results in a small creepage distance between lap joints, which increases the risk of electrical breakdown and can easily cause problems such as leakage and arcing between adjacent lap joints, creating serious electrical safety hazards. Utility Model Content

[0004] This application provides a busbar structure that increases the creepage distance between adjacent joints at the junction of the busbar structure and power devices, thereby meeting safety specifications, reducing the risk of electrical breakdown, leakage between adjacent joints, and arc discharge, and improving electrical safety.

[0005] This application provides a busbar structure, including a busbar body and at least two overlapping members. The busbar body includes a first insulating film, a positive electrode plate, a second insulating film, a negative electrode plate, and a third insulating film stacked along a first direction. The positive electrode plate and the negative electrode plate are respectively connected to the overlapping members. The overlapping members are provided with connection ends for connecting to power devices. The peripheral sidewalls of the overlapping members are covered with a first insulating layer.

[0006] In some embodiments, the lap joint includes a fixed end away from the connecting end, the fixed end having a first electrical contact surface and a fixing structure; the busbar structure further includes a connector, the connector being connected to the fixing structure, such that the connector and the lap joint are respectively clamped on both sides of the positive electrode plate or both sides of the negative electrode plate, and the first electrical contact surface is in contact with the positive electrode plate or the negative electrode plate, and the peripheral sidewall of the connector is an insulating wall.

[0007] In some embodiments, the connector and the fixing structure are detachably connected.

[0008] In some embodiments, the connection end is provided with a second electrical contact surface and a connecting stud.

[0009] In some embodiments, the connector is a conductive element, and the peripheral sidewall of the conductive element is wrapped with a second insulating layer to form the insulating wall.

[0010] In some embodiments, an insulating adhesive is further provided between the end of the insulating wall facing the connector and the positive electrode plate or the negative electrode plate.

[0011] In some embodiments, the end face of the connector away from the overlapping member is covered with a third insulating layer.

[0012] In some embodiments, the first insulating layer is an injection-molded layer, a powder-coated layer, a dip-coated layer, an insulating adhesive layer, or an insulating sleeve.

[0013] In some embodiments, the connector is welded to the positive electrode plate or the negative electrode plate, or the connector is riveted to the positive electrode plate or the negative electrode plate; the connector is provided with mounting holes for connecting to the power device by bolts.

[0014] In some embodiments, the busbar body is further provided with an insulating spacer, the insulating spacer being disposed between two adjacent overlapping members, the insulating spacer including at least one of an insulating spacer protrusion and an insulating spacer groove.

[0015] The busbar structure provided in this application has the following technical advantages:

[0016] By wrapping the peripheral sidewalls of the lap joints with a first insulating layer, the creepage distance between two adjacent lap joints includes the length of the first insulating layer along the axial direction of the lap joints and the sum of the distance between the surfaces of the busbar body and the two lap joints. The increased creepage distance can improve electrical safety, reduce the risk of electrical breakdown due to insufficient creepage, and reduce problems such as leakage and arc discharge between adjacent lap joints.

[0017] Furthermore, by wrapping the first insulation layer around the perimeter wall of the lap joint, the overall volume of the busbar structure is minimally affected, meeting safety requirements while facilitating the miniaturization of the equipment. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of a busbar structure and power devices in a connected state, provided in an embodiment of this application.

[0019] Figure 2 yes Figure 1 Structural diagram of the interlocking component;

[0020] Figure 3 yes Figure 2 A sectional view of the overlapping component;

[0021] Figure 4 yes Figure 1 A schematic diagram of the middle connector.

[0022] Appendix Figures 1-4 The reference numerals in the attached figures are explained as follows:

[0023] 1. Busbar body, 11. First insulating film, 12. Positive electrode plate, 13. Second insulating film, 14. Negative electrode plate, 15. Third insulating film;

[0024] 2. Connecting component, 21. Connecting end, 211. Second electrical contact surface, 212. Connecting stud, 22. Fixing end, 221. First electrical contact surface, 222. Fixing structure, 223. First threaded hole;

[0025] 31 First insulating layer, 32 Second insulating layer, 33 Third insulating layer;

[0026] 4 connectors, 41 insulating wall, 42 fixing studs;

[0027] 5 modules, 51 second threaded hole;

[0028] 6. Insulating adhesive. Detailed Implementation

[0029] To enable those skilled in the art to better understand the technical solutions of this application, the application will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0030] In the fields of power electronics and industrial control, busbar structures, as key circuit connection components, have significant advantages such as excellent repeatable electrical performance, low inductive impedance, and strong anti-interference ability, and are therefore widely used in various industrial frequency converters.

[0031] This application provides a busbar structure, such as Figure 1 As shown, the busbar structure includes a busbar body 1 and at least two overlapping members 2. The busbar body 1 includes a first insulating film 11, a positive electrode plate 12, a second insulating film 12, a negative electrode plate 14, and a third insulating film 13 stacked along a first direction. The positive electrode plate 12 and the negative electrode plate 14 are respectively connected to the overlapping members 2. The overlapping members 2 are also provided with a connection end 21, which is used to connect to a power device 5. The power module 5 may include capacitors, modules, and other devices.

[0032] The connector 2 is a key transition component for achieving electrical connection with the power device 5. The connector 2 includes, but is not limited to, copper pillars. Conductive components such as copper blocks and aluminum pillars can also be used. Due to the inherent structural dimensions between the two electrodes of the power device 5, the spacing between adjacent connectors 2 often fails to meet safety specifications when they are connected to the power device 5. This results in a small creepage distance between connectors 2. Insufficient creepage distance increases the risk of electrical breakdown and can easily cause leakage, arcing, and other problems between adjacent connectors 2, creating serious electrical safety hazards.

[0033] In the busbar structure provided in this embodiment, the peripheral sidewall of the lap joint 2 is wrapped with a first insulating layer 31. This arrangement allows the creepage path between two adjacent lap joints 2 to be as follows: Figure 1 As shown by the thick dashed line, the creepage distance includes the length of the first insulation layer 31 of the sidewalls of the two overlapping parts 2 along the axial direction of the overlapping part 2, and the sum of the distance between the surface of the busbar body 1 and the two overlapping parts 2. Increasing the creepage distance can improve electrical safety, reduce the risk of electrical breakdown due to insufficient creepage, and reduce problems such as leakage and arc discharge between adjacent overlapping parts 2.

[0034] Furthermore, by wrapping the first insulation layer 31 around the two sides of the lap joint, the overall volume of the busbar structure is minimally affected, meeting safety requirements while facilitating the miniaturization of the equipment.

[0035] The positive electrode plate 12 is provided with a first clearance hole, and the negative electrode plate 14 is provided with a second clearance hole. For ease of explanation, the connecting member 2 provided on the positive electrode plate 12 is called the positive electrode connecting member, and the connecting member 2 provided on the negative electrode plate 14 is called the negative electrode connecting member. The first clearance hole corresponds to the negative electrode connecting member, and the second clearance hole corresponds to the positive electrode connecting member. Through the clearance holes, the connecting member 2 is connected to the corresponding positive electrode plate 12 and negative electrode plate 14. The connecting ends 21 of the positive electrode connecting member and the negative electrode connecting member are respectively connected to the two extreme ends of the power device 5.

[0036] The connection points between the busbar structure and the power device 5 refer to the connection points between the positive and negative terminals and the power device 5. Here, the creepage distance of the positive and negative terminals on one side of the third insulating film 15 of the busbar body 1 is related to electrical safety. In this embodiment, a first insulating layer 31 is provided on the peripheral sidewall of the positive and negative terminals to increase the creepage distance between the two terminals 2, thereby meeting safety requirements and improving electrical safety.

[0037] In this embodiment, there are no restrictions on the connection method between the connecting member 2 and the positive electrode plate 12 or the negative electrode plate 14, such as... Figure 1In the embodiment shown, the busbar structure also includes a connector 4. The overlapping member 2 is connected to the positive electrode plate 12 or the negative electrode plate 14 through the connector 4. Alternatively, the overlapping member 2 can also be connected to the positive electrode plate 12 or the negative electrode plate 14 by welding, riveting or other means.

[0038] like Figure 2 and Figure 3 As shown, the connector 2 also includes a fixed end 22, which is used for electrical connection with the positive electrode plate 12 or the negative electrode plate 14. The fixed end 22 and the connecting end 21 are located at the two ends of the axial direction of the connector 2, respectively.

[0039] When the lap joint 2 is connected to the positive electrode plate 12 or the negative electrode plate 14 through the connector 4, the fixed end 22 is provided with a first electrical contact surface 221 and a fixing structure 222. The connector 4 is connected to the fixing structure 222, so that the connector 4 and the lap joint 2 are respectively clamped on both sides of the positive electrode plate 12 or the negative electrode plate 14, and the first electrical contact surface 221 contacts the positive electrode plate 12 or the negative electrode plate 14 to achieve electrical connection. The peripheral sidewall of the connector 4 is an insulating wall 41. The insulating wall 41 is set on one side of the first insulating film 11 to increase the creepage path length between the two connectors 4 and improve electrical safety.

[0040] The lap joint 2 is connected to the positive electrode plate 12 or the negative electrode plate 14 via the connector 4. The positive electrode plate 12 and the negative electrode plate 14 are respectively provided with conductive holes. During installation, the connector 4 passes through the conductive holes and connects to the fixing structure 222, or the fixing structure 222 passes through the conductive holes and connects to the connector 4. Alternatively, the connector 4 and the fixing structure 222 can each be partially located within the conductive holes and connected. During installation, only the connector 4 and the fixing structure 222 of the lap joint 2 need to be connected to achieve the connection between the lap joint 2 and the positive electrode plate 12 or the negative electrode plate 14. The structure is simple and the operation is relatively convenient.

[0041] Furthermore, by connecting the connector 4 to the fixing structure 222 of the lap joint 2 to achieve the connection between the lap joint 2 and the positive electrode plate 12 or the negative electrode plate 14, it is possible to reduce the damage to the first insulation layer 31 of the periphery of the lap joint 2 during the installation process, thereby stabilizing the insulation performance of the first insulation layer 31 of the periphery of the lap joint 2 and improving safety.

[0042] In this embodiment, the connector 4 and the fixing structure 222 are detachably connected to facilitate disassembly and assembly.

[0043] The connector 4 and the fixing structure 222 can be connected by threads, such as... Figure 4As shown, the connector 4 is provided with a fixing stud 42, and the fixing structure 222 is a first threaded hole 223 provided at the fixing end 22 of the overlapping member 2. Alternatively, the connector 4 may have a first threaded hole 223, and the fixing structure 222 may be a fixing stud 42 provided at the fixing end 22 of the overlapping member 2. The fixing stud 42 is threadedly engaged with the first threaded hole 223. During installation, it is only necessary to rotate the connector 4 and the overlapping member 2 relative to each other to clamp the positive electrode plate 12 or the negative electrode plate 14, which is relatively convenient.

[0044] By fixing the stud 42 and the first threaded hole 223 to achieve threaded engagement through relative rotation, the distance between the first electrical contact surface 221 of the connector 4 and the lap joint 2 can be adjusted, thereby making it suitable for positive electrode plates 12 or negative electrode plates 14 of different thicknesses. This reduces the processing accuracy requirements when the first electrical contact surface 221 is in contact with the positive electrode plate 12 or negative electrode plate 14, providing good flexibility and high applicability. Furthermore, the threaded connection can effectively improve the stability of the electrical connection between the first electrical contact surface 221 and the positive electrode plate 12 or negative electrode plate 14 in the installation state.

[0045] In this embodiment, there are no restrictions on the connection method between the connector 4 and the fixing structure 222 of the overlapping member 2. For example, the connector 4 and the fixing structure 222 can also be connected by snap-fit ​​or other methods.

[0046] like Figure 1 , Figure 2 and Figure 3 As shown, the connecting end 21 of the lap joint 2 is provided with a second electrical contact surface 211 and a connecting stud 212. The connecting stud 212 is used to connect with the power device 5. The power device 5 is provided with a second threaded hole 51 for threaded engagement with the connecting stud 212. The connection between the lap joint 2 and the power device 5 is achieved by the threaded engagement between the connecting stud 212 and the second threaded hole 51. In the connected state, the second electrical contact surface 211 can contact the power device 5 to achieve electrical connection with the power device 5.

[0047] The connection between the connector 2 and the power device 5 is achieved by connecting the stud 212 and threadedly engaging the second threaded hole 51 located on the power device 5. The installation operation is relatively convenient, and there is no need to set up additional fasteners, rivets or other fixing parts to fix the connector 2 and the power device 5. This simplifies the overall structure and effectively improves the connection stability between the connector 2 and the module 5.

[0048] In this embodiment, the structure of the connector 4 is not limited. The connector 4 can be a conductive element, and the peripheral sidewall of the conductive element is wrapped with a second insulating layer 32 to form the aforementioned insulating wall 41.

[0049] Alternatively, the connector 4 can be directly made into an insulating component, such as a plastic component, so that the peripheral sidewall of the connector 4 is directly an insulating wall 41. When the connector 4 is made into a conductive component (such as a metal component), its structural strength can be improved, the stability of the connector 4 and the overlapping component 2 in the threaded connection state can be improved, and the contact stability between the first electrical contact surface 221 of the overlapping component 2 and the positive electrode plate 12 or the negative electrode plate 14 can be improved.

[0050] The connector 4 can be made of copper. The peripheral wall of the copper is wrapped with a second insulating layer 32 to form the aforementioned insulating wall 41. Of course, there are no restrictions on the material of the conductive part. For example, steel can also be used. Using copper can make the connector 4 have a better thermal conductivity, so that the heat of the overlapping part 2 can be dissipated in a timely and effective manner, resulting in good heat dissipation performance.

[0051] like Figure 1 As shown, insulating adhesive 6 is also provided between the end of the insulating wall 41 facing the lap joint 2 and the positive electrode plate 12. Similarly, insulating adhesive 6 is also provided between the end of the insulating wall 41 facing the lap joint 2 and the negative electrode plate 14, thereby achieving insulation at the lap joint between the insulating wall 41 and the positive electrode plate 12 or the negative electrode plate 14, and improving electrical safety.

[0052] like Figure 4 As shown, the end face of the connector 4 away from the lap joint 2 is covered with a third insulating layer 33. The third insulating layer 33 effectively isolates the possibility of creepage between the connectors 4 connected to the two adjacent lap joints 2, further improving safety.

[0053] The connector 4 and the fastening structure 222 of the lap joint 2 are connected. The end face of the connector 4 facing the lap joint 2 can be a bare copper structure or can be provided with an insulating layer. The insulating layer can be an insulating and heat-conducting layer. The part of the connector 4 connected to the fastening structure 222, such as the fastening stud 42 or the first threaded hole 223, can be bare copper or can be provided with an insulating layer. The insulating layer can be an insulating and heat-conducting layer.

[0054] The aforementioned insulating layers, including the first insulating layer 31 on the periphery of the overlapping member 2, the second insulating layer 32 on the periphery of the connecting member 4, and the third insulating layer 33 on the end face of the connecting member 4 away from the overlapping member 2, are not limited in type. They can be injection-molded, powder-coated, dip-coated, or insulating adhesive layers, or they can be formed by an insulating sleeve fitted over the component. Furthermore, the insulating layers at each location can be the same or different.

[0055] Taking the first insulating layer 31 provided on the periphery of the overlapping member 2 as an example, the first insulating layer 31 can be formed by injection molding process on the periphery of the overlapping member 2, by powder coating process on the periphery of the overlapping member 2, by dip coating process on the periphery of the overlapping member 2, or by coating the periphery of the overlapping member 2 with insulating adhesive to form an insulating adhesive layer. Alternatively, it can be formed by setting an insulating sleeve that is compatible with the periphery of the overlapping member 2 and putting the insulating sleeve on the periphery of the overlapping member 2. The insulating sleeve and the overlapping member 2 can be prevented from detaching by interference fit or by setting a limiting structure.

[0056] When the lap joint 2 is connected to the positive electrode plate 12 or the negative electrode plate 14 by welding or riveting, the lap joint 2 is also provided with mounting holes. These mounting holes are used to connect to the power device 5 by bolts, so that the connecting end 21 can contact the power device 5 in the connected state to achieve electrical connection. Welding or riveting is the conventional connection method between the lap joint 2 and the positive electrode plate 12 or the negative electrode plate 14. The process is relatively mature, and the lap joint 2 can be directly improved based on the conventional solution by providing a first insulating layer 31 on its outer periphery. It has a wide range of applications.

[0057] To further increase the creepage distance between two adjacent overlaps 2, an insulating gap structure can be provided on the surface of the busbar body 1. The insulating gap structure can include at least one of insulating protrusions and insulating grooves. An insulating protrusion means that the surface of the protrusion is completely insulated, and an insulating groove means that the inner wall surface of the groove is completely insulated. The insulating gap structure is provided between two adjacent overlaps 2 to increase the length of the creepage path between the two overlaps 2 along the surface of the body and improve safety.

[0058] The main body may have only an insulating protrusion, only an insulating groove, or both an insulating protrusion and an insulating groove between two adjacent overlapping parts 2. The shape, number, and arrangement of the insulating protrusion and the insulating groove are not limited.

[0059] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application 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 application.

[0060] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0061] The above are merely preferred embodiments of this application. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of this application, and these improvements and modifications should also be considered within the scope of protection of this application.

Claims

1. A busbar structure, characterized in that, It includes a busbar body (1) and at least two overlapping parts (2). The busbar body (1) includes a first insulating film (11), a positive electrode plate (12), a second insulating film (13), a negative electrode plate (14) and a third insulating film (15) stacked along a first direction. The positive electrode plate (12) and the negative electrode plate (14) are respectively connected to the connector (2), the connector (2) is provided with a connection end (21) for connecting to the power device (5), and the peripheral sidewall of the connector (2) is wrapped with a first insulating layer (31).

2. The busbar structure according to claim 1, characterized in that, The lap joint (2) includes a fixed end (22) away from the connecting end (21), the fixed end (22) being provided with a first electrical contact surface (221) and a fixing structure (222); The busbar structure also includes a connector (4), which is connected to the fixing structure (222) so that the connector (4) and the overlapping member (2) are respectively clamped on both sides of the positive plate (12) or the negative plate (14), and the first electrical contact surface (221) is in contact with the positive plate (12) or the negative plate (14). The peripheral sidewall of the connector (4) is an insulating wall (41).

3. The busbar structure according to claim 2, characterized in that, The connector (4) and the fixing structure (222) are detachably connected.

4. The busbar structure according to claim 2, characterized in that, The connecting end (21) is provided with a second electrical contact surface (211) and a connecting stud (212).

5. The busbar structure according to any one of claims 1-4, characterized in that, The connector (4) is a conductive component, and the peripheral sidewall of the conductive component is wrapped with a second insulating layer (32) to form the insulating wall (41).

6. The busbar structure according to claim 5, characterized in that, The insulating wall (41) is provided with insulating adhesive (6) between its end facing the lap joint (2) and the positive electrode plate (12) or the negative electrode plate (14).

7. The busbar structure according to claim 5, characterized in that, The end face of the connector (4) away from the lap joint (2) is covered with a third insulating layer (33).

8. The busbar structure according to any one of claims 1-4, characterized in that, The first insulating layer (31) is an injection molding layer, a powder coating layer, a dip coating layer, an insulating adhesive layer, or an insulating sleeve.

9. The busbar structure according to any one of claims 1-4, characterized in that, The lap joint (2) is welded to the positive electrode plate (12) or the negative electrode plate (14), or the lap joint (2) is riveted to the positive electrode plate (12) or the negative electrode plate (14). The connector (2) is provided with mounting holes for connecting to the power device (5) by bolts.

10. The busbar structure according to any one of claims 1-4, characterized in that, The busbar body (1) is also provided with an insulating spacer, which is disposed between two adjacent overlapping members (2). The insulating spacer includes at least one of an insulating spacer protrusion and an insulating spacer groove.

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