Conductive connection structure for bus duct and conductive device

Abstract

Embodiments of the present disclosure provide a conductive connection structure for a bus duct and a conductive device. The conductive connection structure includes a first conductive member and at least one second conductive member. The at least one second conductive member is welded with the first conductive member and forms a first welding portion and a second welding portion at the connection with the first conductive member. The second welding portion is formed in the first welding portion, and the second welding portion is located at a tail end of the first welding portion along a welding direction. A thickness of the second welding portion is H1, a thickness of the first welding portion is H2, and 0.8≤H1 / H2≤0.95 is satisfied.

Description

Technical Field

[0001] The embodiments disclosed herein relate generally to the field of busbar trunking technology, and more specifically, to conductive connection structures and conductive devices for busbar trunking. Background Technology

[0002] In busbar trunking, multiple components, such as busbars and power take-off parts, can be welded together using welding techniques to form robust conductive assemblies.

[0003] Friction stir welding is a solid-state joining technology that uses the frictional heat and extrusion generated between a high-speed rotating stirring pin and the workpiece to soften the material at the joint. Then, through the mechanical stirring of the stirring pin and the upsetting pressure, the materials on both sides are fully mixed and diffused to form a weld.

[0004] However, the welded part formed by friction stir welding will leave an exit hole formed by the removal of the friction stir welding needle. This exit hole will increase the resistance of the conductive components, causing abnormal heating, which will affect the conductivity between multiple components such as busbars and power take-off parts. Utility Model Content

[0005] In a first aspect of this disclosure, a conductive connection structure for a busbar trunking is provided, the conductive connection structure including a first conductive element and at least one second conductive element. The at least one second conductive element is welded to the first conductive element, forming a first weld portion and a second weld portion at the connection with the first conductive element. The second weld portion is formed in the first weld portion and is located at the tail end of the first weld portion along the welding direction. The thickness of the second weld portion is H1, and the thickness of the first weld portion is H2, satisfying: 0.8 ≤ H1 / H2 ≤ 0.95.

[0006] According to embodiments of this disclosure, a second weld portion is formed at the tail end of the first weld portion to backfill the first exit hole formed by friction stir welding, and the ratio of the thickness of the second weld portion to the thickness of the first weld portion is between 0.8 and 0.95. In this way, on the one hand, damage to the appearance of the conductive connection structure is effectively avoided, which is beneficial to improving the structural strength of the conductive connection structure; on the other hand, the resistance of the conductive connection structure is effectively reduced, and heat generation is effectively avoided, thereby improving the electrical performance of the conductive connection structure.

[0007] In some embodiments, the shape of the second weld portion along a first cross section perpendicular to the welding direction includes one of a U-shape, a V-shape, and a semi-ellipse.

[0008] In some embodiments, the first weld portion is formed by friction stir welding, the first weld portion is a copper-aluminum composite structure, and the friction stir welding produces a first exit hole on the first weld portion; and the second weld portion is formed by gas metal arc welding, the electrode of the gas metal arc welding is a copper welding wire, and the copper concentration of the copper welding wire is greater than or equal to 90%; or after filling the first exit hole with copper powder, a transition weld portion is formed by secondary friction stir welding, and the transition weld portion is ground to form a second weld portion flush with the surface of the first weld portion, and the second exit hole formed by the secondary friction stir welding protrudes from the surface of the first weld portion.

[0009] In some embodiments, the second weld portion includes an edge structure and a central structure that is wrapped by the edge structure. The edge structure is wrapped by the first weld portion and is located at the junction of the first weld portion and the second weld portion. The copper concentration of the central structure is greater than that of the edge structure.

[0010] In some embodiments, the first conductive element includes a main busbar, each of the second conductive elements includes a power-taking element, each power-taking element is connected to the main busbar and forms the first weld portion at the connection with the main busbar, and the power-taking element is adapted to be connected to an external device to supply power to the external device.

[0011] In some embodiments, the at least one second conductive element includes a pair of power-taking elements, the main busbar includes a first side and a second side disposed opposite to the first side, the first side and the second side extending along the welding direction, wherein one of the power-taking elements in the pair is disposed on the first side, and the other power-taking element in the pair is disposed on the second side.

[0012] In some embodiments, the first conductive element includes a first busbar, each second conductive element includes a second busbar, each second busbar is connected to the first busbar and forms the first weld portion at the connection with the first busbar.

[0013] In some embodiments, the first conductive element includes a first busbar, and the at least one second conductive element includes a second busbar, wherein the second busbar is disposed at an angle relative to the first busbar at one end of the first busbar; or the second busbar is disposed at an angle relative to the first busbar at the middle position of the first busbar.

[0014] In some embodiments, the first conductive element includes a first busbar, and the at least one second conductive element includes a pair of second busbars, one of the second busbars being disposed at an angle relative to the first busbar at one end of the first busbar, and the other of the second busbars being disposed at an angle relative to the first busbar at the opposite end of the first busbar.

[0015] In a second aspect of this disclosure, a conductive device is provided, comprising any conductive connection structure according to the first aspect of this disclosure.

[0016] In some embodiments, the conductive device includes a busbar box assembly.

[0017] It should be understood that the description in this section is not intended to limit the key or essential features of the embodiments of this disclosure, nor is it intended to restrict the scope of this disclosure. Other features of this disclosure will become readily apparent from the following description. Attached Figure Description

[0018] The above and other features, advantages, and aspects of the embodiments of this disclosure will become more apparent from the accompanying drawings and the following detailed description. In the drawings, the same or similar reference numerals denote the same or similar elements, wherein: Figure 1 A top view of a conductive connection structure according to some embodiments of the present disclosure is shown; Figure 2 It shows Figure 1 An enlarged schematic diagram of part A of the conductive connection structure shown; Figure 3 It shows Figure 1 The conductive connection structure shown is a cross-sectional view taken along BB; Figure 4 and Figure 5 It shows Figure 2 The conductive connection structure shown is a cross-sectional view taken along CC. Figures 6 to 9 A schematic diagram of a conductive connection structure according to some other embodiments of the present disclosure is shown.

[0019] Explanation of reference numerals in the attached figures: 100 is a conductive connection structure, 101 is the first welding part, and 102 is the second welding part; 1 is the first conductive component, 11 is the main busbar, 111 is the first side, 112 is the second side, and 12 is the first busbar; 2 is the second conductive component, 21 is the power taking component, and 22 is the second busbar; 31 is the edge structure, and 32 is the central structure. Detailed Implementation

[0020] Embodiments of the present disclosure will now be described in more detail with reference to the accompanying drawings. While embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that the present disclosure will be thorough and complete, and will fully convey the scope of the present disclosure to those skilled in the art.

[0021] The term "comprising" and its variations as used herein signify open inclusion, i.e., "including but not limited to". Unless otherwise stated, the term "or" means "and / or". The term "based on" means "at least partially based on". The terms "one example embodiment" and "one embodiment" mean "at least one example embodiment". The term "another embodiment" means "at least one additional embodiment". The terms "first", "second", etc., may refer to different or the same objects.

[0022] The embodiments of this disclosure provide a conductive connection structure and conductive device for busbar trunking, to at least partially solve the above-mentioned problems. In the following, [the following will be combined with...] Figures 1 to 9 The principles of this disclosure are described.

[0023] Figure 1 A top view of a conductive connection structure 100 according to some embodiments of the present disclosure is shown. Figure 2 It shows Figure 1 An enlarged schematic diagram of part A of the conductive connection structure 100 shown. Figure 3 It shows Figure 1 The conductive connection structure 100 shown is a cross-sectional view taken along BB. (See figure) Figures 1 to 3 As shown, the conductive connection structure 100 described herein includes a first conductive element 1 and at least one second conductive element 2.

[0024] refer to Figures 1 to 3 In some embodiments, at least one second conductive element 2 is welded to the first conductive element 1. For example, at least one second conductive element 2 is connected to the first conductive element 1 by friction stir welding, and at least one second conductive element 2 forms a first weld portion 101 and a second weld portion 102 at the connection with the first conductive element 1. The first weld portion 101 is formed by friction stir welding. The second weld portion 102 is formed in the first weld portion 101. The second weld portion 102 is located at the tail end of the first weld portion 101 along the welding direction X of the friction stir welding.

[0025] Figure 4 and Figure 5 It shows Figure 2 The conductive connection structure 100 shown is a cross-sectional view taken along the CC direction. (See figure) Figure 4 and Figure 5As shown, in some embodiments, the thickness of the second weld portion 102 is H1, and the thickness of the first weld portion 101 is H2. This satisfies the condition: 0.8 ≤ H1 / H2 ≤ 0.95. In this way, on the one hand, the non-penetrating design ensures the sealing of the first weld portion 101, thereby avoiding material leakage. Furthermore, since friction stir welding creates a first exit hole (not shown in the figure) on the first weld portion 101, it facilitates subsequent filling of the first exit hole and the formation of the second weld portion 102 on the first weld portion 101. On the other hand, the non-penetrating design avoids the formation of a penetrating geometric notch on the back side of the first weld portion 101, which helps improve the fatigue strength and static strength of the first weld portion 101, thereby improving the structural strength of the conductive connection structure 100. (Continue referring to...) Figure 4 and Figure 5 When the bottom surface of the first conductive element 1 and the bottom surface of the second conductive element 2 are flush, the thickness H2 of the first welded part 101 can be equal to the thickness of the first conductive element 1 and the second conductive element 2.

[0026] According to embodiments of this disclosure, a second welding portion 102 is formed at the tail end of the first welding portion 101 to backfill the first exit hole formed by friction stir welding, and the ratio of the thickness of the second welding portion 102 to the thickness of the first welding portion 101 is between 0.8 and 0.95. In this way, on the one hand, damage to the appearance of the conductive connection structure 100 is effectively avoided, which is beneficial to improving the structural strength of the conductive connection structure 100; on the other hand, the resistance of the conductive connection structure 100 is effectively reduced, and heat generation is effectively avoided, thereby improving the electrical performance of the conductive connection structure 100. Furthermore, a flow guide plate is not required during the friction stir welding process, and it is not necessary to cut off the flow guide plate after welding, thus avoiding the problems of complex processes and high costs.

[0027] It should be noted that the first conductive element 1 and the second conductive element 2 can be made of different materials. For example, the first conductive element 1 or the second conductive element 2 can include, but is not limited to, materials such as copper, aluminum, and alloys, and the embodiments disclosed herein do not impose such limitations.

[0028] In the following description, the example structure and principle of the conductive connection structure 100 will be mainly described with the first conductive element 1 being one of copper and aluminum, and the second conductive element 2 being the other of copper and aluminum. The same or similar applies to other cases, and this disclosure will not elaborate on them.

[0029] The shape of the second weld portion 102, taken along a first section perpendicular to the welding direction X, depends on the melting point and fluidity of the welding material (e.g., the first conductive element 1 and the second conductive element 2), as well as the parameters of the stirring head. (Reference) Figure 4 and Figure 5In some embodiments, when the material has good fluidity and the welding parameters and stirring head parameters are designed reasonably, the plastic material partially fills the bottom of the first exit hole during the cooling process. In this way, when the second welding part 102 backfills the first exit hole, the shape of the second welding part 102 along the first cross section perpendicular to the welding direction X includes a U-shape.

[0030] In other embodiments, when welding parameters (such as rotational speed or pressure) are insufficient, the plastically flowing material fails to completely fill the first exit hole left by the stirring head when the stirring head is withdrawn, thus failing to adequately cover the bottom of the first exit hole and causing the edge of the first exit hole to be sharp. In this way, when the first exit hole is backfilled by the second welding part 102, the shape of the second welding part 102 along the first section perpendicular to the welding direction X includes a V-shape.

[0031] In other embodiments, as the stirring head rotates, the compression and friction between the shoulder of the stirring head and the stirring needle on the material causes a helical plastic flow. When the stirring head retracts, the material is unevenly distributed circumferentially along the first exit hole. In this way, when the first exit hole is backfilled by the second weld portion 102, the shape of the second weld portion 102 along a first section perpendicular to the welding direction X includes a semi-ellipse. This shape is generally related to the tool design (e.g., a conical stirring needle) and the material flow direction.

[0032] Continue to refer to Figures 1 to 3 In some embodiments, the first conductive element 1 and the second conductive element 2 are welded by friction stir welding, thus allowing them to fuse together. It is understood that friction stir welding softens the materials of the first conductive element 1 and the second conductive element 2 to a thermoplastic state and fuses them together, effectively avoiding defects common in fusion welding such as porosity, solidification cracks, and hot cracks. Furthermore, the resistivity of the welded area is low, which helps reduce heat generation in the welded area. In addition, when the first conductive element 1 is made of either copper or aluminum, and the second conductive element 2 is made of the other of copper or aluminum, the first welded part 101 formed by friction stir welding is a copper-aluminum composite structure.

[0033] The second welded portion 102 according to an embodiment of this disclosure can be formed by various types of welding methods currently known or available in the future. For example, continuing to refer to Figure 4In some embodiments, the second welding part 102 can be welded to the first welding part 101 by gas metal arc welding (GMAW) or non-consumable electrode arc welding (NOAAW) to fuse them together. Specifically, when using pure tungsten or activated tungsten as the NOAAW electrode, the fed copper welding wire can be heated to melt and fill the first exit hole. When using a consumable electrode, the electrode of the GMAW is a copper welding wire, which is directly heated to melt and fill the first exit hole. The copper concentration of the copper welding wire can be greater than or equal to 90%. In other embodiments, the second welding part 102 can also be welded to the first welding part 101 by carbon dioxide shielded gas welding or other inert gas welding to fuse them together; the embodiments of this disclosure do not limit this.

[0034] Continue to refer to Figure 4 Furthermore, when the second welding part 102 is welded to the first welding part 101 by argon arc welding, problems such as the formation of an oxide layer during the welding process due to improper setting of process parameters (e.g., current, voltage), insufficient argon flow, or improper nozzle angle should be avoided, thereby helping to reduce the contact resistance of the welding area.

[0035] Continue to refer to Figure 5 In other embodiments, the second weld portion 102 can also be welded to the first weld portion 101 via secondary friction stir welding to fuse them together. Specifically, after the first friction stir welding is completed, a metal powder, such as copper powder, is filled into the first exit hole, and then the metal powder is stirred and fused with the first weld portion 101 via secondary friction stir welding to form a transition weld portion. The size of the stirring head of the secondary friction stir welding is smaller than that of the stirring head of the primary friction stir welding. For example, the diameter of the needle tip and the needle tail of the secondary friction stir welding head is smaller than that of the needle tip and the needle tail of the primary friction stir welding head, and the difference can be between 0.5 and 2 mm to ensure sufficient stirring. Therefore, the second exit hole (not shown in the figure) formed by the secondary friction stir welding is smaller and is formed on the protruding part of the conductive connection structure 100, that is, the second exit hole can protrude from the surface of the first weld portion 101. In this way, the second exit hole can be completely removed by grinding the transition weld portion, thereby forming a second weld portion 102 flush with the surface of the first weld portion 101, and obtaining a smooth and flat weld area.

[0036] Continue to refer to Figure 5Furthermore, since unfilled voids or weak bonding areas typically exist near the first exit hole in the first weld portion 101, during secondary friction stir welding, the portion of the first weld portion 101 near the first exit hole can be stirred again with metal powder to form the second weld portion 102. It is understood that the size of the plane intercepted by the first exit hole along the second section perpendicular to the thickness direction Y of the first weld portion 101 is smaller than the size of the plane intercepted by the second weld portion 102 along the second section. Therefore, the diameter of the first exit hole is smaller than the width of the second weld portion 102 in the direction perpendicular to the thickness direction Y, and the difference can be between 1 and 2 mm. In addition, the depth of the first exit hole is smaller than the thickness of the second weld portion 102, so that the second weld portion 102 completely encloses the first exit hole. That is, the volume of the second weld portion 102 should be larger than the volume that can be contained within the first exit hole. In this way, on the one hand, stirring and fusion are suitable for eliminating voids or weak bonding areas and forming a dense structure, thereby improving the overall structural strength and electrical performance of the first weld portion 101 and the second weld portion 102. On the other hand, since the break-and-re-fusion effect of secondary friction stir welding is suitable for promoting material redistribution, the grain refinement of the second weld portion 102 is significantly stronger than that of the first weld portion 101, and defects (such as oxide film inclusions) are significantly reduced.

[0037] To ensure that the second welding part 102 completely covers the first exit hole, the shoulder diameter of the stirring head in the secondary friction stir welding is larger than that in the primary friction stir welding, with a difference between 2 and 4 mm. Furthermore, the length from the tip to the tail of the stirring head in the secondary friction stir welding is shorter than that in the primary friction stir welding, with a difference between 0.2 and 0.5 mm, to ensure that the first exit hole is not welded through during repair welding.

[0038] It should be noted that, for example, if the first conductive element 1 is aluminum and the second conductive element 2 is copper, the metal powder can be copper powder. Since copper has a higher structural strength than aluminum and a lower resistivity than aluminum, the structural strength of the conductive connection structure 100 is improved, and its electrical performance is enhanced.

[0039] In comparison, the conductive connection structure 100 filled with the first exit hole by argon arc welding has higher tensile strength, while the conductive connection structure 100 filled with the first exit hole by secondary friction stir welding has higher conductivity and lower resistance.

[0040] Continue to refer to Figure 2 , Figure 4 and Figure 5In some embodiments, the second weld portion 102 may include an edge structure 31 and a central structure 32 enclosed by the edge structure 31. The edge structure 31 may be enclosed by the first weld portion 101 and is located at the junction of the first weld portion 101 and the second weld portion 102. The edge structure 31 includes an annular structure. It is understood that regardless of whether the first exit hole is filled by argon arc welding or secondary friction stir welding, the copper concentration of the central structure 32 is greater than that of the edge structure 31. It is understood that by setting different copper concentrations in the second weld portion 102, the interfacial stress is effectively reduced, which is beneficial to improving the mechanical and electrical properties of the welded area. In the following, the exemplary distribution law of copper concentration will be described mainly by filling the first exit hole by secondary friction stir welding.

[0041] For example, refer to Figure 5 In some embodiments, when the first conductive element 1 is aluminum, the second conductive element 2 is copper, and the metal powder is copper powder, the copper atom content first decreases and then increases along the direction from the second conductive element 2 to the portion of the weld 101 adjacent to the second conductive element 2, the portion of the edge structure 31 adjacent to the second conductive element 2, and the central structure 32. For example, the copper atom content of the second conductive element 2 is 100%. The copper atom content of the portion of the weld 101 adjacent to the second conductive element 2 is 50%. The copper atom content of the portion of the edge structure 31 adjacent to the second conductive element 2 is 60%. The copper atom content of the central structure 32 is 70%.

[0042] Continue to refer to Figure 5 Along the central structure 32, sequentially pointing towards the portion of the edge structure 31 adjacent to the first conductive element 1, the portion of the welded portion 101 adjacent to the first conductive element 1, and the direction of the first conductive element 1, the copper atom content shows a gradient decreasing trend. For example, the copper atom content of the central structure 32 is 70%. The copper atom content of the portion of the edge structure 31 adjacent to the first conductive element 1 is 50%. The copper atom content of the portion of the welded portion 101 adjacent to the first conductive element 1 is 40%. The copper atom content of the first conductive element 1 is 0%.

[0043] It is understandable that, along the direction from the second conductive element 2 to the first conductive element 1, the content of copper atoms shows a trend of first decreasing, then increasing, and then decreasing again. Based on this distribution pattern, the metallurgical bonding between the second welded part 102 and the first welded part 101 is ensured. Simultaneously, the gradual change in copper concentration reduces interfacial stress, which is beneficial for improving the mechanical and electrical properties of the welded area.

[0044] Return to reference Figure 1In some embodiments, the first conductive element 1 may include a main busbar 11, and each second conductive element 2 may include a power-taking element 21. Each power-taking element 21 may be connected to the main busbar 11 and form a first weld portion 101 at the connection with the main busbar 11. The power-taking element 21 is adapted to be connected to an external device to supply power to the external device. For example, the power-taking element 21 is adapted to be connected to the pins of a plug box to supply power to the plug box.

[0045] Continue to refer to Figure 1 In some embodiments, at least one second conductive element 2 may include a pair of power-receiving elements 21. The main busbar 11 includes a first side 111 and a second side 112 disposed opposite to the first side 111. The first side 111 and the second side 112 extend along the welding direction X, respectively. One of the pair of power-receiving elements 21 is disposed on the first side 111, and the other power-receiving element 21 is disposed on the second side 112. In this way, the main busbar 11 can be connected to multiple plug-in boxes simultaneously to supply power to multiple plug-in boxes.

[0046] Figures 6 to 9 A schematic diagram of the conductive connection structure 100 according to other embodiments of the present disclosure is shown. Figures 6 to 9 The conductive connection structure 100 shown is with Figure 1 The conductive connection structure 100 shown has a similar structure, the main difference being the type of the first conductive element 1 and the second conductive element 2. The differences between the two will be described primarily below, while identical parts, such as the structure of the filler 3, the welding method, and the structure of the first welded part 101, will not be repeated.

[0047] refer to Figures 6 to 9 In some embodiments, the first conductive element 1 may include a first busbar 12, and each second conductive element 2 includes a second busbar 22. Each second busbar 22 may be connected to the first busbar 12 and form a first weld portion 101 at the connection with the first busbar 12. In this way, the two busbars can be welded to a single unit.

[0048] Continue to refer to Figure 6 and Figure 7 In some embodiments, there is one second busbar 22, which is disposed at an angle relative to one end of the first busbar 12. (Continue to refer to...) Figure 9 In other embodiments, the second busbar 22 is positioned at an angle relative to the first busbar 12 at the midpoint of the first busbar 12. (Continue to refer to...) Figure 8In other embodiments, at least one second conductive element 2 includes a pair of second busbars 22. One of the pair of second busbars 22 is disposed at an angle relative to one end of the first busbar 12. The other of the pair of second busbars 22 is disposed at an angle relative to the first busbar 12 at the opposite end of the first busbar 12. The angles between the pair of second busbars 22 and the first busbar 12 may be equal or unequal. In this way, by designing conductive connection structures 100 such as horizontal bends and combined bends, multiple busbars can be bent in three-dimensional space to bypass obstacles, facilitating their arrangement in a building and connecting devices in different locations.

[0049] Embodiments of this disclosure also provide a conductive device that includes any of the conductive connection structures described above. For example, the conductive device may include a busbar assembly.

[0050] The welding designs according to embodiments of this disclosure can be applied to various conductive connection structures to at least partially solve the above-mentioned problems. It should be understood that the welding designs according to embodiments of this disclosure can also be applied to other electrical components, and the embodiments of this disclosure are not limiting in this regard.

[0051] The various embodiments of this disclosure have been described above. These descriptions are exemplary and not exhaustive, and are not limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen to best explain the principles, practical application, or technical improvements to the embodiments in the market, or to enable others skilled in the art to understand the embodiments disclosed herein.

Claims

1. A conductive connection structure (100) for busbar trunking, characterized in that, The conductive connection structure (100) includes: First conductive element (1); and At least one second conductive element (2) is welded to the first conductive element (1) and forms a first weld portion (101) and a second weld portion (102) at the connection with the first conductive element (1). The second weld portion (102) is formed in the first weld portion (101), and the second weld portion (102) is located at the tail end of the first weld portion (101) along the welding direction (X). The thickness of the second welded part (102) is H1, the thickness of the first welded part (101) is H2, and satisfies: 0.8≤H1 / H2≤0.

95.

2. The conductive connection structure (100) according to claim 1, characterized in that, The shape of the second welded portion (102) along a first section perpendicular to the welding direction (X) includes one of the following: U-shape, V-shape, and semi-ellipse.

3. The conductive connection structure (100) according to claim 1, characterized in that, The first welded part (101) is formed by friction stir welding. The first welded part (101) is a copper-aluminum composite structure, and the friction stir welding produces a first exit hole on the first welded part (101). as well as The second welded part (102) is formed by gas metal arc welding (GMAW), wherein the electrode of the GMAW is a copper welding wire with a copper concentration greater than or equal to 90%; or After filling the first exit hole with copper powder, a transition weld is formed by secondary friction stir welding. The transition weld is then ground to form a second weld (102) that is flush with the surface of the first weld (101). The second exit hole formed by the secondary friction stir welding protrudes from the surface of the first weld (101).

4. The conductive connection structure (100) according to claim 3, characterized in that, The second welded part (102) includes an edge structure (31) and a central structure (32) wrapped by the edge structure (31). The edge structure (31) is wrapped by the first welded part (101) and located at the junction of the first welded part (101) and the second welded part (102). The copper concentration of the central structure (32) is greater than that of the edge structure (31).

5. The conductive connection structure (100) according to claim 1, characterized in that, The first conductive element (1) includes a main busbar (11), each of the second conductive elements (2) includes a power taking element (21), each of the power taking elements (21) is connected to the main busbar (11) and forms the first welded part (101) at the connection with the main busbar (11), and the power taking element (21) is adapted to be connected to an external device to supply power to the external device.

6. The conductive connection structure (100) according to claim 5, characterized in that, The at least one second conductive element (2) includes a pair of power-taking elements (21), and the main busbar (11) includes a first side (111) and a second side (112) disposed opposite to the first side (111), the first side (111) and the second side (112) extending along the welding direction (X), respectively. One of the paired power-generating components (21) is disposed on the first side (111), and the other power-generating component (21) is disposed on the second side (112).

7. The conductive connection structure (100) according to claim 1, characterized in that, The first conductive element (1) includes a first busbar (12), and each second conductive element (2) includes a second busbar (22). Each second busbar (22) is connected to the first busbar (12) and forms the first weld portion (101) at the connection with the first busbar (12).

8. The conductive connection structure (100) according to claim 7, characterized in that, The first conductive element (1) includes a first busbar (12), and the at least one second conductive element (2) includes a second busbar (22), the second busbar (22) being disposed at an angle relative to the first busbar (12) at one end of the first busbar (12); or The second busbar (22) is positioned at an angle relative to the first busbar (12) at the middle position of the first busbar (12).

9. The conductive connection structure (100) according to claim 7, characterized in that, The first conductive element (1) includes a first busbar (12), and the at least one second conductive element (2) includes a pair of second busbars (22), one of the second busbars (22) is disposed at an angle relative to the first busbar (12) at one end of the first busbar (12), and the other second busbar (22) is disposed at an angle relative to the first busbar (12) at the opposite end of the first busbar (12).

10. A conductive device, characterized in that, The conductive device includes: The conductive connection structure (100) according to any one of claims 1 to 9.

11. The conductive device according to claim 10, characterized in that, The conductive device includes a busbar box assembly.

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