Connection structural member and power equipment

Abstract

The utility model discloses a connecting structural member and power equipment, and belongs to the technical field of power transmission. The connecting structural member comprises a first conducting bar and a second conducting bar, and the thickness of the first conducting bar and the thickness of the second conducting bar are both larger than the thickness of the conducting foil. At least one part of the first conducting bar is stacked on the second conducting bar, the part, stacked on the second conducting bar, of the first conducting bar is provided with a first concave structure, and the first conducting bar is conductively connected with the second conducting bar through the first concave structure. According to the connecting structural member and the power equipment disclosed by the invention, the connecting strength and the through-current capability of the connecting part of the metal bars can be improved, and the cost is not additionally increased.

Description

Technical Field

[0001] This application relates to the technical field of power transmission, and particularly to a connection structure member and a power device. Background Art

[0002] Generally, electrical connection between power devices is achieved through metal bars. In some cases, it is necessary to connect several small-sized metal bars with regular shapes together to fabricate a special-shaped metal bar with a larger cross-sectional area to meet the requirements of product functions and mating structure designs.

[0003] In the related art, the connection between two small-sized metal bars is generally achieved by bolt fastening or lap joint welding. However, the bolt fastening solution has poor reliability. If bolts are used for a long time, there is a risk of loosening, and the current-carrying capacity of the contact interface between the two small-sized metal bars is poor; in the lap joint welding solution, the weld penetration is limited, resulting in limited current-carrying capacity. Increasing the weld penetration will increase the cost of welding equipment, and the welding area may be blocked by other structures, causing inconvenience in welding. Summary of the Utility Model

[0004] Embodiments of this application provide a connection structure member and a power device, which can improve the connection strength and current-carrying capacity at the connection of metal bars without additional cost. The technical solution is as follows:

[0005] In a first aspect, a connection structure member is provided. The connection structure member includes a first conductive bar and a second conductive bar. The thicknesses of the first conductive bar and the second conductive bar are both greater than the thickness of the conductive foil. At least a part of the first conductive bar overlaps the second conductive bar, and a first concave structure is provided on the part of the first conductive bar that overlaps the second conductive bar. The first conductive bar is electrically connected to the second conductive bar through the first concave structure.

[0006] It should be noted that a conductive bar refers to a long conductor made of a conductive material, and its cross-section is usually rectangular or chamfered (rounded) rectangular. A conductive foil refers to a foil made of a conductive material with an extremely thin thickness. Generally speaking, the thickness of a conductive bar is greater than the thickness of a conductive foil.

[0007] Based on the above solution, the first conductive bar and the second conductive bar are stacked in the thickness direction to ensure a large contact surface between the two, which is convenient for subsequent connection and provides the possibility to improve the current-carrying capacity of the connection structure. Moreover, a first recessed structure is provided on the first conductive bar, and the first recessed structure can be arranged at any position where the first conductive bar and the second conductive bar are stacked. Therefore, the setting position is more flexible, which can meet the connection requirements in different environments and improve the connection convenience. At the same time, the first conductive bar is welded to the second conductive bar through the first recessed structure. Therefore, in addition to the contact surface of the first conductive bar and the second conductive bar, the inner side wall or bottom wall of the first recessed structure can also be used for current conduction. Therefore, the current-carrying capacity of the connection structure is further improved, enabling the connection structure to meet the current-carrying requirements of a large current.

[0008] In a possible implementation manner, the first conductive bar is welded to the second conductive bar through the first recessed structure.

[0009] Based on the above possible implementation manner, the first conductive bar and the second conductive bar are connected by welding, and a large penetration depth can be obtained at the welding joint. Therefore, the current-carrying capacity and welding strength of the connection structure can be improved. Moreover, compared with the situation in the related art where only the overlapping edge in the outer edge of the first conductive bar can be used for welding, the weld length and weld cross-sectional area are increased in this solution. Therefore, the current-carrying capacity of the connection structure is improved, and the requirement for the penetration depth of a single weld is reduced.

[0010] In a possible implementation manner, the first conductive bar is connected to the second conductive bar through a first conductive structure filled in the first recessed structure.

[0011] Based on the above possible implementation manner, the first conductive bar can also be connected to the second conductive bar through the first conductive structure. Therefore, the connection surfaces of the first conductive bar and the first conductive structure, and the second conductive bar and the first conductive structure can be used for current conduction. Compared with the solution of connecting and conducting current through a weld, since the first conductive structure is filled in the first recessed structure, the connection area with the first conductive bar and the second conductive bar is larger. Therefore, the current-carrying capacity of the connection structure is further improved.

[0012] In a possible implementation manner, the first recessed structure includes a first through hole, and the axial direction of the first through hole is parallel to the stacking direction of the first conductive bar and the second conductive bar; the bottom end of the first through hole is welded to the second conductive bar, and the bottom end of the first through hole is the end of the first through hole close to the second conductive bar.

[0013] Based on the above possible implementation manners, at least one first through-hole is provided on the first conductive bar, and it is welded and connected to the second conductive bar through the bottom end of the first through-hole. In this solution, since there is no need to limit the position, size, and quantity of the first through-hole, but can be adjusted accordingly according to actual requirements, the structural design of this connection structure member is more flexible, the welding is more convenient, and it can meet different degrees of connection requirements and current-carrying requirements, with a wider adaptability.

[0014] In a possible implementation manner, the aperture of the bottom end of the first through-hole is smaller than the aperture of the top end of the first through-hole, and the bottom end and the top end are opposite to each other.

[0015] Based on the above possible implementation manners, as a through-hole, the first through-hole has an opening at the bottom end and an opening at the top end. The aperture of the opening at the bottom end is smaller than the aperture of the opening at the top end, so that it is convenient for the welding head of the welding equipment to extend into the first through-hole through the opening at the top end for welding work; and, since the welding head is placed obliquely in the first through-hole during work, the movable space of the welding head in the first through-hole is also increased, improving the operation convenience.

[0016] In a possible implementation manner, from the bottom end of the first through-hole to the top end of the first through-hole, the aperture of the first through-hole gradually increases; or,

[0017] The through-hole includes a first hole section and a second hole section. The first hole section and the second hole section are connected axially. The aperture of each part of the first hole section is equal; the inner wall of the second hole section is inclined relative to the axis of the first through-hole, and the part of the second hole section farther away from the second conductive bar has a larger aperture.

[0018] Based on the above possible implementation manners, the first through-hole is designed as a flared shape, or a part of the first through-hole is designed as a flared shape, so that the first through-hole as a whole presents a shape that is wider at the top and narrower at the bottom. Such a shape can cooperate with the inclined placement position of the welding head of the welding equipment during work, increasing the movable space of the welding head in the first through-hole, thus improving the convenience of assembly and welding. And, since only the aperture of a part of the first through-hole increases, the occupation ratio of it in the part where the first conductive bar is stacked on the second conductive bar is also reduced, ensuring sufficient welding strength and current-carrying capacity.

[0019] In a possible implementation manner, the first through-hole is a stepped hole. The stepped hole includes a third hole section and a fourth hole section. The third hole section and the fourth hole section are connected axially, and the third hole section is located on the side of the fourth hole section away from the second conductive bar; wherein, the aperture of the third hole section is larger than the aperture of the fourth hole section.

[0020] Based on the above possible implementation manners, the first through hole is designed as a stepped hole. On the one hand, it is to cooperate with the inclined placement position of the welding head of the welding equipment during operation, so that the movable space of the welding head in the first through hole is increased, so as to improve the convenience of assembly and welding while ensuring sufficient welding strength and current-carrying capacity; on the other hand, compared with through holes of other shapes, the stepped hole is easy to process, so the processing difficulty and cost are also reduced, and the processing efficiency is improved.

[0021] In a possible implementation manner, the first recessed structure includes a first groove, the opening direction of the first groove faces away from the second conductive row, and the bottom of the first groove is welded to the second conductive row.

[0022] Based on the above possible implementation manners, at least one first groove is provided on the first conductive row, and the bottom of the first groove is welded to the second conductive row. In this solution, since there is no need to limit the setting position, size and quantity of the first groove, but can be adjusted accordingly according to actual needs, the structural design of this connection structure member is more flexible, the welding is more convenient, and it can meet different degrees of connection requirements and current-carrying requirements, and the adaptability is more extensive. And, compared with the first through hole, since the first groove is surface-welded to the second conductive row through the bottom, the welding cross-sectional area is larger, and the connection effect and current-carrying effect are both better.

[0023] In a possible implementation manner, the first conductive structure includes a first conductive filling portion, and the first conductive filling portion is formed by additive manufacturing and fills at least a part of the first recessed structure.

[0024] Based on the above possible implementation manners, on the basis that the first conductive row and the second conductive row are welded and connected through the bottom end of the first through hole and / or the bottom of the first groove, a first conductive filling portion is further filled inside the first through hole and / or the first groove. Each first conductive filling portion is respectively connected to the inner wall of the first through hole and the second conductive row, or respectively connected to the bottom and the side wall of the first groove. Therefore, the first conductive filling portion further increases the connection positions between the first conductive row and the second conductive row, and also increases the current-carrying area between the first conductive row and the second conductive row, so that the current can be transmitted between the first conductive row and the second conductive row through the first conductive connection portion, thereby further improving the connection effect and current-carrying effect between the two conductive rows.

[0025] In a possible implementation manner, the first recessed structure includes a second through hole; the first conductive structure includes a second conductive filling portion, and the second conductive filling portion is formed by additive manufacturing and fills at least a part of the second through hole.

[0026] Based on the above possible implementation manners, a second conductive filling portion is formed in the second through hole in an additive manufacturing manner, and the second conductive filling portion forms a surface connection with the first conductive row and the second conductive row respectively. Therefore, the obtained connection structure member has strong mechanical properties and current-carrying capacity.

[0027] In a possible implementation manner, the first concave structure is located inside the first conductive row; or, one side of the first concave structure extends to the edge of the first conductive row.

[0028] Based on the above possible implementation manners, the position of the first concave structure can be set according to actual requirements. For example, it can be set in the middle or at the edge of the first conductive row. On the one hand, it realizes the avoidance of other structures around the welding position, ensures the smooth progress of welding, improves the welding convenience, reduces the welding difficulty, and makes the structural design more flexible; on the other hand, it is also convenient for the processing of the first concave structure and the forming of the first conductive row, and improves the processing and forming efficiency.

[0029] In a possible implementation manner, a second concave structure is provided on the portion of the second conductive row that overlaps the first conductive row. The orthographic projection of the second concave structure on the projection plane and the orthographic projection of the first concave structure on the projection plane are adjacent or have a gap. The projection plane is perpendicular to the overlapping direction of the first conductive row and the second conductive row; the second conductive row is electrically connected to the first conductive row through the second concave structure.

[0030] Based on the above possible implementation manners, on the basis that the first conductive row is electrically connected to the second conductive row through the first concave structure, the second conductive row is also electrically connected to the first conductive row through the second concave structure. Therefore, the connection area between the first conductive row and the second conductive row is increased, and thus the connection structure member can obtain greater current-carrying capacity and structural strength, and can meet the current-carrying requirements of a larger current.

[0031] In a possible implementation manner, the second conductive row is welded to the first conductive row through the second concave structure.

[0032] Based on the above possible implementation manners, the second conductive row is welded to the first conductive row through the second concave structure, and the second concave structure and the first concave structure are not directly opposite, but are arranged in a staggered manner. Therefore, the welding length and the welding cross-sectional area are further increased, and the structural strength and the current-carrying capacity of the connection structure member are improved.

[0033] In a possible implementation manner, the second conductive row is connected to the first conductive row through a second conductive structure filled in the second concave structure.

[0034] Based on the above possible implementation manners, the current can be conducted by using the connection surfaces between the first conductive bar and the second conductive structure, and between the second conductive bar and the second conductive structure. Since the second conductive structure is filled in the second recessed structure, its connection area with the first conductive bar and the second conductive bar is larger, thereby further improving the current-carrying capacity of the connection structure member.

[0035] In a possible implementation manner, the second recessed structure includes a third through-hole, the bottom end of the third through-hole is welded to the first conductive bar, and the bottom end of the third through-hole is the end of the third through-hole close to the first conductive bar; and / or, the second recessed structure includes a second groove, the bottom of the second groove is welded to the first conductive bar; and / or, the second recessed structure includes a fourth through-hole, the second conductive structure includes a third conductive filling portion, and the third conductive filling portion is formed by additive manufacturing and fills at least a part of the fourth through-hole.

[0036] Based on the above possible implementation manners, by providing at least one third through-hole on the second conductive bar and welding the bottom end of the third through-hole to the first conductive bar, and / or, by providing at least one second groove on the second conductive bar and welding the bottom of the second groove to the second conductive bar, and / or, by providing a fourth through-hole on the second conductive bar and forming a third conductive filling portion in the fourth through-hole, the connection and current conduction between the second conductive bar and the first conductive bar are strengthened. Moreover, since there is no need to limit the setting position, size and quantity of the second through-hole / second groove / fourth through-hole, but can be adjusted accordingly according to actual needs, the structural design of this connection structure member is more flexible, the welding is more convenient, and it can meet different levels of connection requirements and current-carrying requirements, with a wider adaptability.

[0037] In a possible implementation manner, the second conductive structure includes a fourth conductive filling portion, and the fourth conductive filling portion is formed by additive manufacturing;

[0038] The fourth conductive filling portion is located in the third through-hole and fills at least a part of the third through-hole; and / or, the fourth conductive filling portion is located in the second groove and fills at least a part of the second groove.

[0039] Based on the above possible implementation manners, a fourth conductive filling portion is formed in the third through-hole by additive manufacturing, and the fourth conductive filling portion forms a surface connection with the first conductive bar and the second conductive bar respectively. Therefore, the obtained connection structure member has extremely strong mechanical properties and current-carrying capacity.

[0040] In a possible implementation, the first conductive bar has a first side surface and a first plate surface, and the first side surface is perpendicularly connected to the first plate surface; the second conductive bar has a second side surface and a second plate surface, and the second side surface is perpendicularly connected to the second plate surface;

[0041] The first side surface is flush with the second side surface, and at least a part of the first side surface is welded to at least a part of the second side surface; alternatively, the first side surface and the second side surface are arranged in a dislocation manner, and at least a part of the first side surface is welded to the second plate surface, or at least a part of the second side surface is welded to the first plate surface.

[0042] Based on the above possible implementation, on the basis of realizing the welding connection between the first conductive bar and the second conductive bar through the first concave structure and / or the second concave structure, the side surface of the first conductive bar is also welded to the plate surface or the side surface of the second conductive bar, or the plate surface of the first conductive bar is welded to the side surface of the second conductive bar. Therefore, the welding length and the welding cross-sectional area are further increased, that is, the welding strength and reliability are improved, and the current-carrying capacity of the connection structure is enhanced.

[0043] In a second aspect, a power device is provided, and the power device includes the connection structure and a power device described in the first aspect.

[0044] Based on the above solution, by adopting the above connection structure, the power device realizes the electrical connection inside the power device or the electrical connection between the power device and other external devices, so that the overall structure is more stable, the connection reliability is good, the connection strength is high, it supports large current-carrying requirements, the assembly and manufacturing processes are simple, and the cost is low.

[0045] Based on the implementation manners provided in the above aspects of the present application, further combinations can be made to provide more implementation manners. Description of the Drawings

[0046] Figure 1 is a schematic structural diagram of a conductive bar connected by bolt fastening in the related art;

[0047] Figure 2 is a schematic structural diagram of a conductive bar welded by a lap joint in the related art;

[0048] Figure 3 is a schematic structural diagram of a connection structure provided by an embodiment of the present application;

[0049] Figure 4 is a schematic front projection diagram of a first conductive bar on a projection plane provided by an embodiment of the present application;

[0050] Figure 5It is a schematic diagram of the orthographic projection of the first conductive bar and the second conductive bar provided by the embodiment of the present application on the projection plane;

[0051] Figure 6 It is a schematic cross-sectional view of a connection structure member provided by the embodiment of the present application;

[0052] Figure 7 It is a schematic structural diagram of a first conductive bar provided by the embodiment of the present application;

[0053] Figure 8 It is another schematic structural diagram of the first conductive bar provided by the embodiment of the present application;

[0054] Figure 9 It is yet another schematic structural diagram of the first conductive bar provided by the embodiment of the present application;

[0055] Figure 10 It is a schematic diagram of the position of a first weld seam in a first through hole provided by the embodiment of the present application;

[0056] Figure 11 It is another schematic diagram of the position of a first weld seam in a first through hole provided by the embodiment of the present application;

[0057] Figure 12 It is another schematic diagram of the position of a first weld seam in a first through hole provided by the embodiment of the present application;

[0058] Figure 13 It is another schematic diagram of the position of a first weld seam in a first through hole provided by the embodiment of the present application;

[0059] Figure 14 It is another schematic cross-sectional view of a connection structure member provided by the embodiment of the present application;

[0060] Figure 15 It is another schematic cross-sectional view of a connection structure member provided by the embodiment of the present application;

[0061] Figure 16 It is another schematic cross-sectional view of a connection structure member provided by the embodiment of the present application;

[0062] Figure 17 It is another schematic cross-sectional view of a connection structure member provided by the embodiment of the present application;

[0063] Figure 18 It is another schematic cross-sectional view of a connection structure member provided by the embodiment of the present application;

[0064] Figure 19 It is another schematic cross-sectional view of a connection structure member provided by the embodiment of the present application;

[0065] Figure 20It is a schematic diagram of the front projection of another first conductive row provided by an embodiment of the present application on a projection plane;

[0066] Figure 21 It is a schematic structural diagram of another connecting structure member provided by an embodiment of the present application;

[0067] Figure 22 It is a schematic structural diagram of another connecting structure member provided by an embodiment of the present application;

[0068] Figure 23 It is a schematic structural diagram of another connecting structure member provided by an embodiment of the present application;

[0069] Figure 24 It is a schematic structural diagram of another connecting structure member provided by an embodiment of the present application;

[0070] Figure 25 It is a schematic cross-sectional view of another connecting structure member provided by an embodiment of the present application;

[0071] Figure 26 It is a schematic cross-sectional view of another connecting structure member provided by an embodiment of the present application;

[0072] Figure 27 It is a schematic structural diagram of another connecting structure member provided by an embodiment of the present application.

[0073] Reference numerals:

[0074] 10. First metal row; 20. Second metal row; 30. Bolt; 40. Weld seam;

[0075] 1. First conductive row; 11. First recessed structure; 111. First through hole; 1111. Inner wall; 1112. First hole section; 1113. Second hole section; 1114. Third hole section; 1115. Fourth hole section; 112. First groove; 113. First front projection; 114. Second through hole; 12. First plate surface; 13. Second plate surface; 14. First side surface; 15. Second front projection; 16. First conductive structure; 161. First conductive filling part; 162. Second conductive filling part;

[0076] 2. Second conductive row; 21. Second recessed structure; 211. Third through hole; 212. Second groove; 213. Third front projection; 214. Fourth through hole; 22. Third plate surface; 23. Fourth plate surface; 24. Second side surface; 25. Fourth front projection; 26. Second conductive structure; 261. Third conductive filling part; 262. Fourth conductive filling part;

[0077] 3. First weld seam; 4. First welding surface; 5. Second weld seam; 6. Second welding surface; 7. Third weld seam. Detailed implementation manners

[0078] It should be clear that the described embodiments are only a part of the embodiments of this application, rather than all of them. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in this application without creative efforts belong to the scope of protection of this application.

[0079] In the description of this application, unless otherwise specified, " / " means "or". For example, A / B can mean A or B. The "and / or" herein is only a description of the association relationship of associated objects, indicating that three relationships can exist. For example, A and / or B can mean: A exists alone, A and B exist simultaneously, and B exists alone. In addition, "at least one" means one or more, and "a plurality" means two or more.

[0080] In the embodiments of this application, prefix words such as "first" and "second" are only used to distinguish different described objects, and do not limit the position, execution order, priority, quantity, content, etc. of the described objects, and the words such as "first" and "second" do not necessarily limit being different.

[0081] In the description of this application, it should be noted that unless otherwise clearly specified and limited, the term "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection or can communicate with each other; it can be a direct connection, or an indirect connection through an intermediate medium, and can be the connection inside two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to specific circumstances.

[0082] In the embodiments of this application, words such as "exemplary" or "for example" are used to represent examples, illustrations or explanations. Any embodiment or design solution described as "exemplary" or "for example" in this application should not be construed as being more preferred or having more advantages than other embodiments or design solutions. Exactly, using words such as "exemplary" or "for example" is intended to present relevant concepts in a specific manner.

[0083] Next, the technical solutions in the embodiments of this application will be described in detail with reference to the accompanying drawings.

[0084] As power equipment continues to develop towards large capacity, high integration, and high power density, the requirements for the current-carrying capacity of the connection structure of power equipment are also continuously increasing. In practical applications, metal bars are generally used to achieve electrical connection between power equipment with large current-carrying requirements, and in order to meet the product function and cooperate with the structural design requirements, the metal bars often need to be made into special-shaped shapes.

[0085] The current-carrying capacity of a metal row is related to its cross-sectional size. Under the development trend of ultra-high power and extremely high power density, the cross-sectional area size of the metal row has increased significantly, resulting in a decrease in the manufacturability of its bending forming and an increase in manufacturing costs. By splitting a large-sized metal row into several small-sized metal rows and then connecting them to make a special-shaped current-carrying metal row, the cost can be effectively reduced. In related technologies, the connection between two small-sized metal rows generally adopts the method of bolt fastening or lap joint welding.

[0086] Figure 1 FIG. is a schematic structural diagram of the connection between metal rows by the bolt fastening scheme in related technologies, as Figure 1 shown, a part of the first metal row 10 overlaps on the second metal row 20, and a plurality of bolts 30 are arranged in the overlapping area of the two, and the plurality of bolts 30 tightly connect the first metal row 10 and the second metal row 20. However, this bolt fastening scheme requires additional investment in bolts, which will increase the material cost, and the assembly efficiency of the bolts is low, which is not friendly to DFX (Design for X, design for all links in the product life cycle), the reliability after assembly is poor, there is a risk of loosening during long-term operation, and the current-carrying capacity of the contact interface between the two small-sized metal rows is poor, and the bolt assembly position is prone to become a local heating point.

[0087] Figure 2 FIG. is a schematic structural diagram of the connection between metal rows by the lap joint welding scheme in related technologies, as Figure 2 shown, a part of the first metal row 10 overlaps on the second metal row 20, and the first metal row 10 and the second metal row 20 are connected together by welding the lap joint of the first metal row 10 and the second metal row 20, and a weld seam 40 is formed at the lap joint of the first metal row 10 and the second metal row 20. However, in the lap joint welding scheme, the weld penetration of the weld seam is limited, resulting in limited current-carrying capacity. If you want to increase the weld penetration, a laser welding machine with a higher power needs to be used, and the equipment cost will increase greatly; in addition, the welding area may be blocked by other structures, causing inconvenience in welding, resulting in the welding equipment being unable to be in place or the operating space being insufficient. In addition, the workpiece needs to be flipped during welding, which will reduce the production efficiency and is not conducive to the realization of automated welding.

[0088] In view of the defects of the above-mentioned related technology solutions, the embodiment of the present application provides a connection structure member, which can be applied to the connection between power equipment, and has the advantages of high reliability, being able to support high-power current-carrying requirements, and not additionally increasing assembly and manufacturing costs, etc.

[0089] The connection structure member provided by the embodiment of the present application can be, for example, a conductive row structure member, a conductive plate appearance member, or a metal busbar, etc. As Figure 3As shown in the figure, the connection structure member includes a first conductive busbar 1 and a second conductive busbar 2. The first conductive busbar 1 is a connection structure on a first power device, and the second conductive busbar 2 is a connection structure on a second power device. The first conductive busbar 1 and the second conductive busbar 2 can play the role of transmitting current, and the first power device and the second power device are electrically connected through the first conductive busbar 1 and the second conductive busbar 2.

[0090] Among them, a conductive busbar is a long conductor made of conductive material, and its cross-section is usually rectangular or chamfered (rounded) rectangular. Exemplarily, the first conductive busbar 1 and the second conductive busbar 2 can be cuboid-shaped or other irregular three-dimensional structures. Moreover, the first conductive busbar 1 and the second conductive busbar 2 have good electrical conductivity. In some examples, the first conductive busbar 1 and the second conductive busbar 2 can be metal bars, such as copper bars, aluminum bars, alloy (such as copper alloy, aluminum alloy, steel, titanium alloy, etc.) bars, composite metal (i.e., a composite material formed by combining metal and other materials) bars, etc., or can be conductive busbars made of special functional conductive materials (i.e., conductor materials that do not mainly function as conductors but have good performance in aspects such as electrothermal, electromagnetic, electro-optical, and electrochemical effects). The material of the first conductive busbar 1 and the material of the second conductive busbar 2 can be the same or different; furthermore, the first conductive busbar 1 and the second conductive busbar 2 can be plated or unplated. In addition, the sizes of the first conductive busbar 1 and the second conductive busbar 2 can be flexibly designed according to actual needs. For example, the thickness of the first conductive busbar 1 and the thickness of the second conductive busbar 2 can be equal or unequal.

[0091] In practical applications, the first conductive busbar 1 and the second conductive busbar 2 are usually made of copper. In this case, the first conductive busbar 1 and the second conductive busbar 2 are also usually referred to as copper bars or copper busbars. In the embodiments of the present application, power devices are connected through conductive busbars, which have good current-carrying capacity while achieving sufficient connection strength and can meet the large current-carrying transmission requirements of, for example, more than 250A.

[0092] In some examples, the thickness of the first conductive busbar 1 is greater than the thickness of the conductive foil, and the thickness of the second conductive busbar 2 is also greater than the thickness of the conductive foil. A conductive foil refers to a foil material made of conductive material, and its thickness is extremely thin. Generally speaking, the thickness of the conductive foil is less than the thickness of the conductive busbar. Taking the conductive busbar as a copper bar and the conductive foil as a copper foil as an example, in some examples, from the dimension of product specifications, the copper bar and the copper foil can be divided but are not limited to referring to the Chinese national standards GB / T2059-2017 "Copper and Copper Alloy Strips" and GB / T5187-2021 "Copper and Copper Alloy Foil", that is, the thickness of the copper bar is greater than 0.15mm, and the thickness of the copper foil is less than or equal to 0.15mm; in other examples, from the dimension of welded workpieces, the thickness of the copper bar is greater than 0.4mm, and the thickness of the copper foil is less than 0.4mm.

[0093] As shown Figure 3 in the figure, in this connection structure, at least a part of the first conductive row 1 overlaps the second conductive row 2, and a first recessed structure 11 is provided on the part of the first conductive row 1 that overlaps the second conductive row 2.

[0094] Specifically, as shown Figure 3 in the figure, the first conductive row 1 includes a first plate surface 12 and a second plate surface 13 that are oppositely arranged, and the second conductive row 2 includes a third plate surface 22 and a fourth plate surface 23 that are oppositely arranged. When the first conductive row 1 and the second conductive row 2 are stacked in the thickness direction, the first plate surface 12 contacts the third plate surface 22, the second plate surface 13 is located on the side of the first plate surface 12 away from the second conductive row 2, and the fourth plate surface 23 is located on the side of the third plate surface 22 away from the first conductive row 1. In some examples, the first plate surface 12 and the second plate surface 13 can be flat surfaces; in other examples, the first surface and the second surface can also be plate surfaces with a certain slope or unevenness, which are not limited herein. The following introduces the solution of the embodiment of the present application with the above first plate surface 12, second plate surface 13, third plate surface 22, and fourth plate surface 23 being flat, but it does not limit this solution.

[0095] In some examples, a part of the second plate surface 13 of the first conductive row 1 is recessed to form the first recessed structure 11. As shown Figure 4 in the figure, the first recessed structure 11 has a first orthographic projection 113 on the projection plane, and the part of the first conductive row 1 that overlaps the second conductive row 2 (not shown in the figure) has a second orthographic projection 15 on the projection plane. The second orthographic projection 15 is shown Figure 4 by a dashed line in the figure. The first orthographic projection 113 is located within the second orthographic projection 15, and the area of the first orthographic projection 113 is smaller than the area of the second orthographic projection 15. Among them, the projection plane is perpendicular to the stacking direction of the first conductive row 1 and the second conductive row 2. The first conductive row 1 can be conductively connected to the second conductive row 2 through the first recessed structure 11. For example, referring to Figure 3 , the first conductive row 1 can be welded to the second conductive row 2 through the first recessed structure 11; or, referring to Figure 24 , the first recessed structure 11 can also be filled with a first conductive structure 16, and the first conductive row 1 can also be connected to the second conductive row 2 through the first conductive structure 16; or, the first conductive row 1 can be first welded to the second conductive row 2 through the first recessed structure 11, and then the first recessed structure 11 is filled with the first conductive structure 16 so that the first conductive structure 16 forms connections with the first conductive row 1 and the second conductive row 2 respectively. Among them, the first conductive structure 16 is made of a conductive material and has conductive performance.

[0096] In some examples, in combination with Figure 5 and Figure 6As shown, in this connection structure member, a second recessed structure 21 is provided in the portion where the second conductive row 2 is stacked on the first conductive row 1. Specifically, in a partial area of the fourth plate surface 23 of the second conductive row 2, a recess is formed to form the second recessed structure 21. The second recessed structure 21 has a third orthographic projection 213 on the projection plane, and the portion of the second conductive row 2 stacked on the first conductive row 1 has a fourth orthographic projection 25 on the projection plane. The third orthographic projection 213 is located within the fourth orthographic projection 25, and the area of the third orthographic projection 213 is smaller than the area of the fourth orthographic projection 25. Among them, the fourth orthographic projection 25 coincides with the second orthographic projection 15, and the first orthographic projection 113 and the third orthographic projection 213 are adjacently or spaced apart. In Figure 5 this case, the first orthographic projection 113, the second orthographic projection 15, and the fourth orthographic projection 25 are all shown by dashed lines. The second conductive row 2 can be electrically connected to the first conductive row 1 through the second recessed structure 21. For example, the second conductive row 2 is welded to the first conductive row 1 through the second recessed structure 21; or, as Figure 27 shown, a second conductive structure 26 can also be filled in the second recessed structure 21, and the second conductive row 2 can also be connected to the first conductive row 1 through the second conductive structure 26; or, the second conductive row 2 can be first welded to the first conductive row 1 through the second conductive structure 26, and then the second conductive structure 26 is filled in the second recessed structure 21 so that the second conductive structure 26 forms connections with the first conductive row 1 and the second conductive row 2 respectively. Among them, the second conductive structure 26 is made of a conductive material and has electrical conductivity. The material of the second conductive structure 26 can be the same as or different from the material of the first conductive structure 16.

[0097] In some examples, both the first conductive structure 16 and the second conductive structure 26 are formed by additive manufacturing. The additive manufacturing process includes but is not limited to processes such as 3D printing and arc welding cladding. Among them, the 3D printing process includes but is not limited to material extrusion molding, laser powder bed method, etc. Among them, the materials of the first conductive structure 16 and the second conductive structure 26, that is, the filling materials of the additive manufacturing process, can be copper and its alloys, silver and its alloys, or other alloys; the filling methods can be pre-embedded powder, real-time powder filling or wire filling, etc.; the melting method of the filling material can be melting through an arc heat source, a laser heat source or a plasma heat source, etc.

[0098] In implementation, the filling material used to form the first conductive structure 16 or the second conductive structure 26 enters the corresponding recessed structure in a liquid or molten state, and then forms a dense metal structure after solidification and cooling. Among them, at the edge of the recessed structure, the base material parts of the first conductive row 1 and the second conductive row 2 melt and are mixed with the filling material, and after solidification and cooling, the connection between the conductive structure and the corresponding conductive row is realized, and the cross-sectional area at the connection is relatively large. The connection structure member obtained in this way has good mechanical properties and current-carrying capacity.

[0099] In some other examples, the first conductive structure 16 or the second conductive structure 26 can also be formed by brazing. The brazing filler metal can be, for example, a silver-copper-titanium alloy. During brazing, the brazing filler metal melts and wets and spreads on the surface of the recessed structure, thereby forming a reaction layer interface. It should be noted that due to the composition of the brazing filler metal, the current-carrying capacity of the connection structure obtained by brazing is worse than that of the connection structure obtained by additive manufacturing.

[0100] Optionally, the specific forms of the first recessed structure 11 and the second recessed structure 21 can include at least one of a groove and a through hole. Below, with reference to the accompanying drawings, the specific structure of the first recessed structure 11 and its setting manner will be introduced. It should be noted that the specific structure of the second recessed structure 21 and its setting manner in the second conductive bar 2 are similar to the specific structure of the first recessed structure 11 and its setting manner in the first conductive bar 1. Those skilled in the art can easily infer the specific structure and setting manner of the second recessed structure 21 based on the description of the first recessed structure 11 in the following text.

[0101] In some examples of the present application, the first recessed structure 11 includes a first through hole 111. The axial direction of the first through hole 111 is parallel to the stacking direction of the first conductive bar 1 and the second conductive bar 2, that is, the thickness direction of the first conductive bar 1 and the second conductive bar 2. The position, size, shape, and number of the first through holes 111 are all set according to actual requirements. When the number of the first through holes 111 is more than one, these first through holes 111 are spaced apart from each other and do not communicate with each other.

[0102] For example, referring to Figure 3 and Figure 7 , the number of the first through holes 111 is one, which is located inside the portion of the first conductive bar 1 that overlaps the second conductive bar 2 and is circumferentially closed. The shape of the first through hole 111 is a rectangular hole as shown in Figure 3 , or a round hole (elliptical hole) as shown in Figure 7 . Another example is, referring to Figure 8 , the number of the first through holes 111 is two, which are located inside the portion of the first conductive bar 1 that overlaps the second conductive bar 2 and are each circumferentially closed. The shapes of the two first through holes 111 are both rectangular holes and are spaced apart. Still another example is, referring to Figure 9 , the number of the first through holes 111 is one, which is located at the edge of the portion of the first conductive bar 1 that overlaps the second conductive bar 2 (not shown in the figure) and is open on one side. The shape of the first through hole 111 is a rectangular hole.

[0103] The first conductive bar 1 is welded to the second conductive bar 2 through the first recessed structure 11. Specifically, the first conductive bar 1 is welded to the second conductive bar 2 through the bottom end of the first through hole 111, where the bottom end of the first through hole 111 includes a part of the inner wall 1111 of the first through hole 111 close to the second conductive bar 2 and a part of the first plate surface 12 located at the edge of the first through hole 111. As Figure 14 shown, the bottom edge of the bottom end of the first through hole 111 is welded to the third plate surface 22 of the second conductive bar 2 by fillet welding, and a first weld seam 3 is formed at the welding position. The first weld seam 3 extends circumferentially along the bottom end of the first through hole 111. In some examples, the high temperature generated by welding may cause the part of the first plate surface 12 located at the edge of the first through hole 111 to melt and be welded to the third plate surface 22 of the second conductive bar 2. Therefore, the first weld seam 3 may be formed at the junction of the first plate surface 12 and the third plate surface 22. In other embodiments, the high temperature generated by welding may also cause a part of the inner wall 1111 of the first through hole 111 close to the second conductive bar 2 to melt and be welded to the third plate surface 22 of the second conductive bar 2. Or when the wire filling welding process is used, the welding wire will connect the inner wall 1111 of the first through hole 111 and the third plate surface 22 respectively. Therefore, the first weld seam 3 may also be formed between the inner wall 1111 of the first through hole 111 and the third plate surface 22. In other some examples, the high temperature generated by welding may cause a large area of the bottom end of the first through hole 111 to melt. Therefore, the first weld seam 3 may be formed at the junction of the first plate surface 12 and the third plate surface 22, and between the inner wall 1111 of the first through hole 111 and the third plate surface 22.

[0104] In some examples, the entire bottom end of the first through hole 111 can be welded. As Figure 10 shown, the first weld seam 3 surrounds the bottom end of the first through hole 111; in other examples, only a part of the bottom end of the first through hole 111 can be welded, so that the first weld seam 3 is only formed in a part of the area at the bottom end of the first through hole 111. For example, see Figure 11 , the two long sides at the bottom end of the first through hole 111 are welded; see Figure 12 , one long side at the bottom end of the first through hole 111 is welded; see Figure 13 , a part of one long side at the bottom end of the first through hole 111 is welded.

[0105] It should be noted that in the embodiments of the present application, the welding methods between the first conductive bar 1 and the second conductive bar 2 include but are not limited to the following methods: laser beam welding without wire filling, laser beam welding with wire filling, MIG welding (Melt Inert Gas Welding), TIG welding (Tungsten Inert Gas Welding), laser-arc hybrid welding, laser-MIG / TIG hybrid welding.

[0106] In some examples, when welding is performed by non-fill wire laser welding, the first weld seam 3 is formed by the solidification of the first conductive row 1 and the second conductive row 2 after melting at high temperature. At least a part of the first weld seam 3 is located on the contact surface of the first conductive row 1 and the second conductive row 2. When current is passed, the current flows along the melt depth direction.

[0107] In some examples, when welding is performed by fill wire laser welding, the first weld seam 3 is formed by the solidification of the first conductive row 1, the second conductive row 2, and the welding wire after melting at high temperature. At least a part of the first weld seam 3 is located at the intersecting edge of the first conductive row 1 and the second conductive row 2 and appears as the cover pass. When current is passed, at least a part of the current flows through the cover pass.

[0108] Both MIG welding and TIG welding belong to welding processes with relatively small welding penetration depth but high filling rate. In some examples, when welding is performed by MIG welding or TIG welding, the first weld seam 3 also appears as the cover pass, and when current is passed, at least a part of the current flows through the cover pass.

[0109] In some examples, when welding is performed by laser-arc hybrid welding or laser-MIG / TIG hybrid welding, generally, laser welding is first used for backing welding to melt the contact surface of the first conductive row 1 and the second conductive row 2 to obtain a larger penetration depth, and then arc welding, MIG welding, or TIG welding is used for filling to form the cover pass. When current is passed, a part of the current can flow along the penetration depth direction, and another part of the current can flow through the cover pass, thus obtaining a greater current-carrying capacity.

[0110] Welding equipment has certain requirements for the operating space. Taking laser welding as an example, generally, a high-intensity laser beam is focused on the workpiece to be welded through a laser welding head. Therefore, sufficient space should be reserved near the position to be welded for welding operations. In the examples of the present application, since the welding position in the first through hole 111 is the bottom end of the first through hole 111, it is necessary to extend the laser welding head into the position near the bottom end of the first through hole 111. The method commonly used in the related art is to increase the aperture of the first through hole 111 so that the space inside the hole is large enough. However, this will cause the size of the first through hole 111 to be too large, which may affect the strength and current-carrying capacity of the connecting structure.

[0111] In some examples, the first through hole 111 has an axially opposite top end and bottom end, wherein the top end of the first through hole 111 is farther from the second conductive row 2 than the bottom end. As Figures 15 to 18As shown, the first through hole 111 is a through hole, with an opening formed at the top end on the second board surface 13 of the first conductive row 1 and an opening formed at the bottom end on the first board surface 12 of the first conductive row 1. Moreover, the aperture of the opening located on the first board surface 12 is smaller than that of the opening located on the second board surface 13, so as to facilitate the welding head to extend into the first through hole 111 through the opening on the second board surface 13, and to increase the movement space of the welding head inside the first through hole 111, thereby improving the convenience of the welding operation.

[0112] In some examples, such as Figure 15 As shown, the first through hole 111 is a flared hole with an inclined inner wall 1111. From the bottom end to the top end of the first through hole 111, the aperture of the first through hole 111 gradually increases.

[0113] Therefore, based on the above examples, considering that the welding position is at the bottom end of the first through hole 111, the welding head of the welding equipment needs to be inserted into the first through hole 111 obliquely. Therefore, the first through hole 111 is designed to have a shape with an increasing aperture in the direction away from the second conductive row 2, thereby increasing the movable space of the welding head inside the first through hole 111 and improving the convenience of assembly and welding.

[0114] In other examples, such as Figure 16 and Figure 17 As shown, the first through hole 111 includes a first hole section 1112 and a second hole section 1113. The first hole section 1112 and the second hole section 1113 are arranged in sequence along the axial direction of the through hole and are communicated with each other. Among them, the apertures of all parts of the first hole section 1112 are equal, that is, the first hole section 1112 is a straight hole section; the inner wall 1111 of the second hole section 1113 is inclined relative to the axial direction of the first through hole 111, and the part of the second hole section 1113 farther away from the second conductive row 2 has a larger aperture, that is, the second hole section 1113 is a flared hole section.

[0115] Optionally, as Figure 16 shown, the first hole section 1112 is located on the side of the second hole section 1113 close to the second conductive row 2; or, as Figure 17 shown, the first hole section 1112 is located on the side of the second hole section 1113 away from the second conductive row 2.

[0116] Compared with Figure 15 the flared hole shown, Figure 16 and Figure 17 the first through hole 111 shown can achieve structural avoidance of the welding head. On this basis, due to having a smaller hole volume, the space occupied in the first conductive row 1 is also smaller, so that the first conductive row 1 can obtain better structural stiffness. Among them, Figure 16 the first through hole 111 shown and Figure 17The first through hole 111 shown can be applicable to different welding scenarios. For example, Figure 16 The first through hole 111 shown is applicable to a laser welding scenario. Figure 17 The first through hole 111 shown is applicable to a MIG welding scenario.

[0117] In other examples, such as Figure 18 As shown, the first through hole 111 is a stepped hole, including a third hole section 1114 and a fourth hole section 1115. The third hole section 1114 and the fourth hole section 1115 are arranged in sequence along the axial direction and are communicated with each other, and the third hole section 1114 is located on the side of the fourth hole section 1115 away from the second conductive row 2. Among them, both the third hole section 1114 and the fourth hole section 1115 are straight hole sections with equal pore diameters in each part, and the pore diameter of the third hole section 1114 is larger than that of the fourth hole section 1115; or at least one of the third hole section 1114 and the fourth hole section 1115 is a trumpet hole section with a gradually increasing pore diameter in the direction away from the second conductive row 2, and the pore diameter of each part of the fourth hole section 1115 is greater than or equal to the pore diameter of each part of the third hole section 1114.

[0118] Compared with Figure 15 the trumpet hole shown, Figure 18 the first through hole 111 shown, while being able to achieve structural avoidance of the welding head, ensures the structural stiffness of the first conductive row 1 due to its smaller hole volume. Compared with Figure 16 and Figure 17 the first through holes shown, Figure 18 the first through hole 111 shown is easier to machine because they are all straight hole sections.

[0119] In some examples, the first conductive structure includes a first conductive filling portion 161. On the basis of the welding connection between the bottom end of the first through hole 111 and the second conductive row 2, as Figure 25 shown, at least a part of the first through hole 111 can also be filled through the first conductive filling portion 161. Among them, the first conductive filling portion 161 can be formed by additive manufacturing. Specifically, the first conductive filling portion 161 is formed in the first through hole 111 by multi-layer multi-pass surfacing or by alloy powder cladding and deposition in the first through hole 111.

[0120] Of course, in other examples of the present application, the first conductive row 1 and the second conductive row 2 can also be connected only through the first conductive structure without being connected by a welding process. Such as Figure 26As shown, the first recessed structure 11 further includes a second through-hole 114, and the setting manner of the second through-hole 114 is the same as that of the first through-hole 111, which will not be elaborated here. The first conductive structure includes a second conductive filling portion 162, and the second conductive filling portion 162 is filled in the second through-hole 114. For example, it can fill a part of the second through-hole 114 or fill the second through-hole 114 completely. Among them, the second conductive filling portion 162 can be formed by additive manufacturing. Specifically, the second conductive filling portion 162 is formed in the second through-hole 114 by multi-layer multi-pass surfacing or by alloy powder cladding and deposition in the second through-hole 114.

[0121] Similarly, in some examples of the present application, the second recessed structure 21 may include a third through-hole 211, as Figure 6 shown, the inner wall of the third through-hole 211 is welded to the first conductive row 1 to form a second weld seam 5. Among them, the specific structure of the third through-hole 211, its setting manner in the second conductive row 2, and its welding connection manner with the first conductive row 1 are similar to the specific structure of the first through-hole 111, its setting manner in the first conductive row 1, and its welding connection manner with the second conductive row 2, which will not be elaborated here.

[0122] It should be noted that the number of the first weld seam 3 formed in the first through-hole 111 and the weld seam formed in the third through-hole 211 can be one or multiple. When the number is multiple, a parallel weld seam array can be formed. Exemplarily, as Figure 6 shown, multiple parallel first weld seams 3 are formed in the first through-hole 111.

[0123] Similarly, in some examples, the second conductive structure 26 includes a fourth conductive filling portion 262. On the basis of the welding connection between the inner wall of the third through-hole 211 and the first conductive row 1, as Figure 25 shown, at least a part of the third through-hole 211 can also be filled by the fourth conductive filling portion 262. Among them, the fourth conductive filling portion 262 can be formed by additive manufacturing. Specifically, the fourth conductive filling portion 262 is formed in the third through-hole 211 by multi-layer multi-pass surfacing or by alloy powder cladding and deposition in the third through-hole 211.

[0124] Of course, in other examples of the present application, the first conductive row 1 and the second conductive row 2 can also be connected only through the second conductive structure 26 without using a welding process for connection. As Figure 26As shown, the second recessed structure 21 further includes a fourth through hole 214. The arrangement of the fourth through hole 214 is the same as that of the third through hole 211, and thus will not be described herein again. The second conductive structure 26 includes a third conductive filling portion 261, and the third conductive filling portion 261 is filled in the fourth through hole 214. For example, it may fill a part of the fourth through hole 214 or fill the fourth through hole 214 completely. Among them, the third conductive filling portion 261 can be formed by additive manufacturing. Specifically, the third conductive filling portion 261 is formed in the fourth through hole 214 by multi-layer multi-pass surfacing or by alloy powder cladding and deposition in the fourth through hole 214.

[0125] In some other examples of the present application, the first recessed structure 11 does not penetrate the first conductive row 1 in the thickness direction. That is, as Figure 19 shown, the first recessed structure 11 includes a first groove 112. The depth of the first groove 112 is less than the thickness of the first conductive row 1, and the depth direction of the first groove 112 is parallel to the thickness direction of the first conductive row 1. The opening of the first groove 112 is located on the second plate surface 13, and the opening direction is away from the second conductive row 2. The first groove 112 has a bottom disposed opposite to the opening, and the bottom is a solid portion with a certain thickness. It is easy to understand that the sum of the depth of the first groove 112 and the thickness of the bottom of the first groove 112 is equal to the thickness of the first conductive row 1, and the depth direction of the first groove 112 is parallel to the thickness direction of the bottom of the first groove 112.

[0126] In the embodiments of the present application, the position, size, shape, and number of the first grooves 112 are all set according to actual needs. When the number of the first grooves 112 is more than one, these first grooves 112 are spaced apart from each other and do not communicate with each other.

[0127] The first conductive row 1 is welded to the second conductive row 2 through the first recessed structure 11. Specifically, the first conductive row 1 is welded to the second conductive row 2 through the bottom of the first groove 112. As Figure 19As shown, the bottom of the first groove 112 is welded to the third plate surface 22 of the second conductive row 2 by means of fusion welding. Specifically, since the thickness of the bottom of the first groove 112 is less than the thickness of the first conductive row 1, in some cases, when the welding head of the welding equipment welds from the inside of the first groove 112 to its bottom, the high temperature generated by the welding is sufficient to melt the bottom of the first groove 112 and even part of the third plate surface 22 of the second conductive row 2. In this way, the bottom of the first groove 112 is welded to the second conductive row 2, and a first welding surface 4 is formed at the welding position. Among them, according to different welding processes, the first welding surface 4 can be obtained by melting and then solidifying the part of the first plate surface 12 that belongs to the bottom of the first groove 112 and the part of the third plate surface 22 of the second conductive row 2 that is opposite to the first groove 112, or can be obtained by melting and then solidifying these two parts and the solder filled between the first conductive row 1 and the second conductive row 2.

[0128] Since the cross-sectional area size of the first welding surface 4 is large, it has better current-carrying capacity. Exemplarily, for the first groove 112 and the first through hole 111 with equal cross-sectional areas, the cross-sectional area of the first welding surface 4 that the first groove 112 can form is usually larger than the cross-sectional area of the first weld seam 3 that the first through hole 111 can form. Therefore, the welding strength and current-carrying capacity that the first conductive row 1 can achieve by welding the bottom of the first groove 112 to the second conductive row 2 will be better.

[0129] Similarly, in some examples of the present application, as Figure 6 shown, the second recessed structure 21 may include a second groove 212, and the bottom of the second groove 212 is welded to the first conductive row 1 to form a second welding surface 6. Among them, the specific structure of the second groove 212, its setting mode in the second conductive row 2, and its welding connection mode with the first conductive row 1 are similar to the specific structure of the first groove 112, its setting mode in the first conductive row 1, and its welding connection mode with the second conductive row 2, and will not be elaborated here.

[0130] In other examples of the present application, the first recessed structure 11 may simultaneously include the first through hole 111 and the first groove 112. Optionally, the number of the first through holes 111 may be one or more, and / or the number of the first grooves 112 may be one or more, and any one of the first through holes 111 and any one of the first grooves 112 are spaced apart from each other and not connected. Optionally, the first through hole 111 may be a circumferentially closed hole provided inside the first conductive row 1 or an open hole extending to the edge of the first conductive row 1 on one side; and / or the first groove 112 may be a circumferentially closed groove provided inside the first conductive row 1 or an open groove extending to the edge of the first conductive row 1 on one side.

[0131] Exemplarily, as Figure 20 shown, along the overlapping edge of the portion of the first conductive row 1 stacked on the second conductive row 2, a plurality of first recessed structures 11 extending to the edge of the first conductive row 1 on one side are arranged at intervals, such as first through-holes 111, which can ensure the welding strength while ensuring the current-carrying capacity, and the first conductive row 1 with this shape is easy to cut and manufacture, with simple process and low cost.

[0132] Similarly, in some examples of the present application, the second recessed structure 21 may simultaneously include a third through-hole 211 and a second groove 212. The number of the third through-hole 211 and the second groove 212 may be one or more, and the setting position may be inside or at the edge of the second conductive row 2. The embodiments of the present application do not limit this, as long as the strength requirement and the current-carrying requirement can be met.

[0133] In addition, as Figures 21 to 23 shown, the first conductive row 1 further has a first side surface 14, and the first side surface 14 is perpendicularly connected to the first plate surface 12; the second conductive row 2 further has a second side surface 24, and the second side surface 24 is perpendicularly connected to the third plate surface 22. In some examples, the first side surface 14 is flush with the second side surface 24. In this case, as Figure 21 shown, at least a part of the first side surface 14 is welded to at least a part of the second side surface 24. Specifically, the parts of the first side surface 14 and the second side surface 24 close to each other are welded to form a third weld seam 7. In other examples, the first side surface 14 and the second side surface 24 are arranged in a staggered manner. In one case, as Figure 22 shown, at least a part of the first side surface 14 is welded to the third plate surface 22. Specifically, the part of the first side surface 14 close to the third plate surface 22 is welded to the third plate surface 22 by fillet welding to form a third weld seam 7; in another case, as Figure 23 shown, at least a part of the second side surface 24 is welded to the first plate surface 12. Specifically, the part of the second side surface 24 close to the first plate surface 12 is welded to the first plate surface 12 by fillet welding in the Hong Kong style to form a third weld seam 7.

[0134] Through the above solutions, the first conductive row 1 and the second conductive row 2 are not only welded and connected through the first recessed structure 11 and / or the second recessed structure 21, but also welded and connected through the third recessed structure. Therefore, the welding length and the welding cross-sectional area are further increased, that is, the welding strength and reliability are improved, and the current-carrying capacity of the connection structure member is also improved.

[0135] In summary, the connection structure provided in the embodiments of the present application is applicable to connection scenarios where there are certain current-carrying requirements between conductors. By providing a recessed structure on the busbar and welding based on the contact position between the inner wall or bottom of the recessed structure and another busbar, welding between the busbars is achieved, thereby obtaining the connection structure. The advantages of this solution are as follows: First, it simplifies the manufacturing process of large cross-sectional area busbars, reducing material and labor costs; Second, the position, size, and quantity of the recessed structure can be flexibly designed according to requirements, reducing the requirements for the penetration depth of a single weld seam and the requirements for structural avoidance during the welding process. Only one-sided welding is required without flipping the workpiece, improving production efficiency; Third, welding through the recessed structure increases the welding cross-sectional area, improves the current-carrying capacity of the busbar contact surface, reduces the contact surface impedance, thereby reducing the loss of the busbar contact surface, enhancing equipment efficiency and equipment reliability, and facilitating the miniaturization design of the equipment.

[0136] The embodiments of the present application also provide a power device, which includes a power device and the above-mentioned connection structure.

[0137] By adopting the above-mentioned connection structure, the overall structure of the power device is stable, the connection reliability is good, the connection strength is high, it supports large current-carrying requirements, and the assembly and manufacturing processes are simple and the cost is low.

[0138] The power devices involved in the embodiments of the present application are generally devices with high-power current-carrying requirements, such as outdoor cabinets, cabinet power supply cabinets, box power supply devices, vehicle-mounted devices, charging and energy storage devices, power conversion devices, etc.

[0139] In one example, the power device may include a power device, and the internal components of the power device are electrically connected through the above-mentioned connection structure, or the power device is electrically connected to external devices through the above-mentioned connection structure.

[0140] In another example, the power device may include at least two power devices, such as a first power device and a second power device, and the first power device and the second power device are electrically connected through the above-mentioned connection structure.

[0141] Among them, the power device is also called a power electronic device, and the power device may include, but is not limited to, semiconductor power devices such as MOS transistors, IGBTs (Insulated Gate Bipolar Transistors), thyristors, and diodes, as well as power modules such as SCR (Silicon Controlled Rectifier) modules and IGBT modules.

[0142] In yet another example, the power device may also be in the form of a device component. For example, the power device includes a first power device and a second power device, and the first power device and the second power device are electrically connected through the above-mentioned connection structure member.

[0143] Any combination of the above optional technical solutions can form an optional embodiment of the present disclosure, which will not be elaborated herein one by one.

[0144] The above are only the optional embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A connecting structure, characterized in that: The connecting structure comprises a first conductive row (1) and a second conductive row (2), wherein the thickness of the first conductive row (1) and the thickness of the second conductive row (2) are both greater than the thickness of the conductive foil; At least a portion of the first conductive bar (1) is stacked on the second conductive bar (2), and a portion of the first conductive bar (1) stacked on the second conductive bar (2) is provided with a first recessed structure (11), and the first conductive bar (1) is conductively connected to the second conductive bar (2) via the first recessed structure (11).

2. The connecting structure according to claim 1, characterized in that: The first conductive bar (1) is connected to the second conductive bar (2) by welding via the first recessed structure (11).

3. The connecting structure according to claim 1 or 2, characterized in that: The first conductive row (1) is connected to the second conductive row (2) via a first conductive structure (16) filled in the first recessed structure (11).

4. The connecting structure according to claim 2, characterized in that: The first recessed structure (11) comprises a first through hole (111), wherein the axial direction of the first through hole (111) is parallel to the stacking direction of the first conductive row (1) and the second conductive row (2); The bottom end of the first through hole (111) is welded to the second conductive bar (2), and the bottom end of the first through hole (111) is an end of the first through hole (111) close to the second conductive bar (2).

5. The connecting structure according to claim 4, characterized in that: The hole diameter of the bottom end of the first through hole (111) is smaller than the hole diameter of the top end of the first through hole (111), and the bottom end is opposite to the top end.

6. The connecting structure according to claim 5, characterized in that: From the bottom end of the first through hole (111) to the top end of the first through hole (111), the aperture of the first through hole (111) gradually increases; or, The first through hole (111) comprises a first hole segment (1112) and a second hole segment (1113); the first hole segment (1112) and the second hole segment (1113) are connected in the axial direction; the apertures of various parts of the first hole segment (1112) are equal; the inner wall (1111) of the second hole segment (1113) is inclined relative to the axial direction of the first through hole (111); the aperture of the part of the second hole segment (1113) that is farther away from the second conductive bar (2) is larger.

7. The connecting structure according to claim 4, characterized in that: The first through hole (111) is a stepped hole, the stepped hole comprising a third hole segment (1114) and a fourth hole segment (1115), the third hole segment (1114) and the fourth hole segment (1115) being connected in the axial direction, and the third hole segment (1114) is located on a side of the fourth hole segment (1115) away from the second conductive bar (2); Wherein, the aperture of the third hole segment (1114) is larger than the aperture of the fourth hole segment (1115).

8. The connecting structure according to claim 2, characterized in that: The first recessed structure (11) comprises a first groove (112), the opening direction of the first groove (112) is away from the second conductive bar (2), and the bottom of the first groove (112) is welded to the second conductive bar (2).

9. The connecting structure according to claim 3, characterized in that: The first conductive structure (16) comprises a first conductive filling portion (161), wherein the first conductive filling portion (161) is formed by additive manufacturing and fills at least a portion of the first recessed structure (11).

10. The connecting structure according to claim 3, characterized in that: The first recessed structure (11) comprises a second through hole (114); The first conductive structure (16) includes a second conductive filling portion (162), the second conductive filling portion (162) is formed by additive manufacturing and fills at least a portion of the second through hole (114).

11. The connecting structure according to claim 1, characterized in that: The first recessed structure (11) is located inside the first conductive row (1); or one side of the first recessed structure (11) extends to the edge of the first conductive row (1).

12. The connecting structure according to claim 1, characterized in that: A portion of the second conductive row (2) stacked on the first conductive row (1) is provided with a second recessed structure (21), an orthographic projection of the second recessed structure (21) on a projection plane and an orthographic projection of the first recessed structure (11) on the projection plane are adjacent to or spaced apart from each other, and the projection plane is perpendicular to a stacking direction of the first conductive row (1) and the second conductive row (2); The second conductive bar (2) is conductively connected to the first conductive bar (1) via the second recessed structure (21).

13. The connecting structure according to claim 12, characterized in that: The second conductive bar (2) is connected to the first conductive bar (1) by welding via the second recessed structure (21).

14. The connecting structure according to claim 12 or 13, characterized in that: The second conductive row (2) is connected to the first conductive row (1) via a second conductive structure (26) filled in the second recessed structure (21).

15. The connecting structure according to claim 14, characterized in that: The second recessed structure (21) comprises a third through hole (211), the bottom end of the third through hole (211) is welded to the first conductive bar (1), and the bottom end of the third through hole (211) is an end of the third through hole (211) close to the first conductive bar (1); and / or, The second recessed structure (21) comprises a second groove (212), the bottom of the second groove (212) being welded to the first conductive bar (1); and / or, The second recessed structure (21) comprises a fourth through hole (214), and the second conductive structure (26) comprises a third conductive filling portion (261), wherein the third conductive filling portion (261) is formed by additive manufacturing and fills at least a portion of the fourth through hole (214).

16. The connecting structure according to claim 15, characterized in that: The second conductive structure (26) comprises a fourth conductive filling portion (262), and the fourth conductive filling portion (262) is formed by additive manufacturing; The fourth conductive filling portion (262) is located in the third through hole (211) and fills at least a portion of the third through hole (211); and / or the fourth conductive filling portion (262) is located in the second groove (212) and fills at least a portion of the second groove (212).

17. The connecting structure according to claim 1, characterized in that: The first conductive bar (1) has a first side surface (14) and a first plate surface (12), and the first side surface (14) is vertically connected to the first plate surface (12); the second conductive bar (2) has a second side surface (24) and a third plate surface (22), and the second side surface (24) is vertically connected to the third plate surface (22); The first side surface (14) is flush with the second side surface (24), and at least a portion of the first side surface (14) is welded to at least a portion of the second side surface (24); or, The first side surface (14) and the second side surface (24) are staggered, and at least a portion of the first side surface (14) is welded to the third plate surface (22), or at least a portion of the second side surface (24) is welded to the first plate surface (12).

18. An electric power device, characterized in that: The electric power equipment comprises the connection structure and the power device according to any one of claims 1 to 17.

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