Wiring devices and photovoltaic systems

Abstract

This utility model relates to the field of solar photovoltaic technology, and particularly to a wiring device and a photovoltaic system. The wiring device includes a busbar, a protection unit, and a conductive sheet; the busbar and the protection unit are disposed on one side of the conductive sheet in a first direction, and spaced apart in a second direction. The busbar is mechanically connected to the conductive sheet, and the protection unit is electrically connected to the conductive sheet. The mechanical connection between the busbar and the conductive sheet has high structural strength and stable connection, effectively avoiding connection failure between the conductive sheet and the busbar, as well as the problems of localized abnormal heating of the photovoltaic module, reduced power generation efficiency, and even photovoltaic module failure caused by connection failure.

Description

Technical Field

[0001] This utility model relates to the field of solar photovoltaic technology, and in particular to a wiring device and a photovoltaic system. Background Technology

[0002] In solar photovoltaic systems, the wiring device plays a crucial role in collecting and transmitting current from the photovoltaic modules. Currently, the conductive plates and busbars within the wiring device are connected by welding. However, welding is prone to instability, easily leading to weld failure between the conductive plates and busbars. This can cause localized abnormal heating of the photovoltaic module, affecting power generation efficiency, and even causing the photovoltaic module to fail. Utility Model Content

[0003] In view of this, the present invention proposes a wiring device and a photovoltaic system, aiming to solve the technical problem that welding failure between the conductive sheet and the bus bar in the existing wiring device leads to local abnormal heating of the photovoltaic module, affects the power generation efficiency, and may even cause the photovoltaic module to fail.

[0004] To achieve the above objectives, the technical solution of this utility model is implemented as follows:

[0005] In a first aspect, this utility model provides a wiring device, which includes a busbar, a protection unit, and a conductive sheet; the busbar and the protection unit are disposed on one side of the conductive sheet along a first direction, and the busbar and the protection unit are spaced apart along a second direction; the busbar is mechanically connected to the conductive sheet, and the protection unit is electrically connected to the conductive sheet.

[0006] In some possible implementations, the conductive sheet has a first connecting portion on one side in the first direction, the first connecting portion and the busbar extend in a third direction respectively, the first connecting portion and the busbar are mechanically connected, and the first direction, the second direction and the third direction are perpendicular to each other.

[0007] In some possible implementations, the first connecting portion and the busbar are riveted together.

[0008] In some possible implementations, a riveting groove is formed at the riveting point of the first connecting part and the busbar, the depth of the riveting groove is H1, the thickness of the first connecting part is H2, and the thickness of the busbar is H3, satisfying that H1 > H2 + H3.

[0009] In some possible implementations, there are two conductive sheets, two busbars, and the protection unit and the two busbars are disposed between the two conductive sheets; the protection unit and the two busbars are spaced apart in the second direction, the two busbars are arranged facing each other in the first direction, and an assembly space is formed between the two busbars.

[0010] In some possible implementations, the wiring device further includes a junction box, which has a mounting cavity inside. The protection unit and the conductive sheet are disposed in the mounting cavity. The bottom of the junction box is provided with a guide portion and a through hole. The guide portion extends from the wall of the through hole into the mounting cavity. One end of the busbar passes through the through hole and is inserted into the mounting cavity at a position limited by the guide portion.

[0011] In some possible implementations, the end of the conductive sheet having a first connecting portion is located at the upper end of the guide portion, and the first connecting portion extends toward the upper end of the junction box; the busbar is higher than the guide portion in a third direction, and the busbar extends toward the upper end of the junction box.

[0012] In some possible implementations, the bottom of the junction box is further provided with a support portion, the upper end of which is connected to the conductive sheet.

[0013] In some possible implementations, the junction box is further provided with a flow guide groove, the upper end of which is lower than the upper opening of the junction box, and the lower end of which is connected to the outside of the junction box; in the third direction, the busbar and the conductive sheet are lower than the upper end of the flow guide groove; and potting compound is provided inside the junction box.

[0014] Secondly, this utility model embodiment also provides a photovoltaic system, which includes a photovoltaic module and a wiring device, wherein a busbar of the wiring device is led out from the photovoltaic module, and the wiring device is as described above.

[0015] Compared with prior art, the present invention has the following advantages:

[0016] In the wiring device of this application embodiment, the mechanical connection between the busbar and the conductive sheet has high structural strength and stable connection, which can effectively avoid connection failure between the conductive sheet and the busbar, as well as the problems of local abnormal heating of the photovoltaic module, affecting power generation efficiency, or even photovoltaic module failure caused by connection failure. Moreover, when the busbar and the conductive sheet are mechanically connected, the busbar and the conductive sheet are in contact and adhere to each other, and the resistance after the connection between the busbar and the conductive sheet is small, especially compared with the resistance of the connection between the busbar and the conductive sheet through soldering material, which effectively reduces the loss of electrical energy during transmission.

[0017] The above description is merely an overview of the technical solution of this utility model. In order to better understand the technical means of this utility model and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this utility model more obvious and understandable, specific embodiments of this utility model are given below. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the accompanying drawings used in the description of the embodiments will be briefly introduced below.

[0019] Figure 1 This is a schematic diagram of the structure of a photovoltaic module according to one embodiment of this application;

[0020] Figure 2 This is a schematic diagram of the junction box according to one embodiment of this application;

[0021] Figure 3 This is a top view of the wiring device according to one embodiment of this application;

[0022] Figure 4 for Figure 3 A schematic diagram of the structure in the AA cross-sectional view;

[0023] Figure 5 This is a schematic diagram of the riveting structure of the busbar and conductive sheet according to one embodiment of this application;

[0024] Figure 6 This is a structural schematic diagram of the riveting position of the busbar and conductive sheet according to one embodiment of this application.

[0025] Explanation of reference numerals in the attached figures:

[0026] 1. Busbar;

[0027] 2. Protection unit;

[0028] 3. Conductive sheet; 31. First connecting part; 32. Second connecting part; 33. Riveting groove;

[0029] 4. Junction box; 41. Through hole; 42. Guide part; 43. Flow guide groove; 44. Support part; 45. Mounting cavity;

[0030] 5. Photovoltaic modules;

[0031] 6. Riveting mechanism; 61. Punch; 62. Die;

[0032] X, first direction; Y, second direction; Z, third direction. Detailed Implementation

[0033] Exemplary embodiments of the present invention will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the present invention are shown in the drawings, it should be understood that the present invention may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this invention will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.

[0034] In current technology, the conductive piece 3 and the busbar 1 within the wiring device are connected by welding, such as resistance welding or electromagnetic welding. Welding involves melting solder by heating to fill the gap between the conductive piece 3 and the busbar 1, thus connecting them. However, welding suffers from problems such as unstable welding results, which can easily lead to welding failure between the conductive piece 3 and the busbar 1. For example, the soldering iron tip used for welding has unidirectional heat conduction, and the welding area is relatively large. If the heat conduction is uneven, uneven solder melting can easily occur, leading to cold solder joints or false solder joints. For example, residual adhesive or foreign matter adhering to the busbar or junction box 4 can hinder effective bonding with the solder, affecting the welding effect. For example, the welding position between the conductive piece 3 and the busbar 1 is susceptible to mechanical fatigue due to thermal stress, long-term outdoor use, and wind vibration, resulting in cold solder joints or detachment.

[0035] Furthermore, soldering requires high-temperature operation (temperatures can reach 200℃~400℃), which can easily cause thermal deformation or aging of the junction box 4 of the wiring device. If the solder used for soldering contains elements such as lead, it will also pollute the environment.

[0036] Reference Figures 1 to 6 As shown, this application provides a wiring device and a photovoltaic system that can solve the above-mentioned welding problems, improve the stability of the connection between the conductive sheet 3 and the busbar 1 in the wiring device, and avoid connection failure between the conductive sheet 3 and the busbar 1.

[0037] The wiring device and photovoltaic system provided in this application will be described in detail below with reference to the accompanying drawings, through specific embodiments and application scenarios.

[0038] The wiring device has a first direction X, a second direction Y, and a third direction Z. The first direction X, the second direction Y, and the third direction Z intersect each other. The included angles between the first direction X, the second direction Y, and the third direction Z are set according to usage requirements. When the wiring device has a relatively regular structure, the first direction X can be the length direction of the wiring device, the second direction Y can be the width direction of the wiring device, and the third direction Z can be the length direction of the wiring device. The first direction X, the second direction Y, and the third direction Z are perpendicular to each other.

[0039] In some embodiments, the wiring device includes a busbar 1, a protection unit 2, and a conductive sheet 3; the busbar 1 and the protection unit 2 are disposed on one side of the conductive sheet 3 along a first direction X, and the busbar 1 and the protection unit 2 are spaced apart along a second direction Y; the busbar 1 is mechanically connected to the conductive sheet 3, and the protection unit 2 is electrically connected to the conductive sheet 3.

[0040] In this embodiment, the busbar 1 and the protection unit 2 are disposed on one side of the conductive sheet 3 along the first direction X, and the busbar 1 and the protection unit 2 are spaced apart along the second direction Y. In this way, the connection position of the busbar 1 and the conductive sheet 3 is spaced apart from the connection position of the protection unit 2 and the conductive sheet 3, which can avoid the busbar 1 interfering with the connection between the protection unit 2 and the conductive sheet 3, and also avoid the protection unit 2 interfering with the connection between the busbar 1 and the conductive sheet 3.

[0041] In this embodiment, compared to the connection between the busbar 1 and the conductive sheet 3 by welding, the mechanical connection between the busbar 1 and the conductive sheet 3 has high structural strength and stable connection. It can effectively avoid connection failure between the conductive sheet 3 and the busbar 1, as well as the problem of local abnormal heating of the photovoltaic module caused by connection failure, affecting power generation efficiency, or even failure of the photovoltaic module.

[0042] Moreover, when the busbar 1 and the conductive sheet 3 are mechanically connected, the busbar 1 and the conductive sheet 3 are in contact and fit together. The resistance after the busbar 1 and the conductive sheet 3 are connected is small, especially compared to the resistance of the busbar 1 and the conductive sheet 3 connected by solder material (the current also needs to flow through the solder material, so the resistance will be relatively large), which effectively reduces the loss of electrical energy during transmission.

[0043] In some possible implementations, the conductive sheet 3 has a first connecting portion 31 on one side in the first direction X, and the first connecting portion 31 and the busbar 1 extend in the third direction Z respectively, and the first connecting portion 31 and the busbar 1 are mechanically connected.

[0044] In this embodiment, the first connecting portion 31 and the busbar 1 extend along the third direction Z, and the busbar 1 and the protection unit 2 are spaced apart in the second direction Y. The connection between the first connecting portion 31 and the busbar 1 will not interfere with the connection between the protection unit 2. Thus, there is sufficient assembly space for the first connecting portion 31 and the busbar 1 to achieve a mechanical connection. The provision of the first connecting portion 31 can also increase the area of ​​the conductive sheet 3 and improve the heat dissipation effect of the conductive sheet 3.

[0045] In some possible implementations, the conductive sheet 3 is provided with a first connecting portion 31 and a second connecting portion 32 on one side of the first direction X. The first connecting portion 31 and the second connecting portion 32 are spaced apart in the second direction Y. The first connecting portion 31 extends along the third direction Z. The first connecting portion 31 is riveted to the busbar 1, and the second connecting portion 32 is electrically connected to the pins of the protection unit 2.

[0046] In some possible implementations, the first connecting part 31 and the busbar 1 are riveted together.

[0047] In this embodiment, the first connecting part 31 and the busbar 1 are riveted by using external force to cause plastic deformation of the first connecting part 31 and the busbar 1, so that one of the first connecting part 31 and the busbar 1 is embedded into the other of the first connecting part 31 and the busbar 1, thereby achieving a permanent connection between the first connecting part 31 and the busbar 1.

[0048] In some possible implementations, a riveting groove 33 is formed at the riveting point of the first connecting part 31 and the busbar 1. The depth of the riveting groove 33 is H1, the thickness of the first connecting part 31 is H2, and the thickness of the busbar 1 is H3, satisfying H1 > H2 + H3. Thus, the depth H1 of the riveting groove 33 is relatively large, allowing the first connecting part 31 and the busbar 1 to be securely riveted together. Sufficient tensile strength is maintained between the first connecting part 31 and the busbar 1, effectively preventing connection failure between the conductive sheet 3 and the busbar 1. (Refer to...) Figure 6 As shown, the thickness H2 of the first connecting part 31 and the thickness H3 of the busbar 1 are both the thicknesses of the unriveted positions.

[0049] Moreover, the depth H1 of the riveting groove 33 is greater than the sum of the thickness H2 of the first connecting part 31 and the thickness H3 of the busbar 1. After the first connecting part 31 and the busbar 1 undergo plastic deformation, the connection area of ​​the first connecting part 31 and the busbar 1 is larger, making the first connecting part 31 and the busbar 1 firmly riveted.

[0050] Understandably, the conductive sheet 3 and busbar 1, as the main channels for current transmission, need to possess good conductivity and good ductility. The materials of the conductive sheet 3 and busbar 1 can be selected according to application requirements. For example, the conductive sheet 3 can be made of high-purity copper, which has good conductivity, effectively reducing resistance and minimizing energy loss during transmission, ensuring a stable flow of current from the photovoltaic module into the subsequent circuit. Alternatively, the busbar 1 can be made of copper, tin-plated copper strip, or nickel-plated copper strip, which have high conductivity, and the tin plating on the surface can enhance oxidation resistance.

[0051] Because busbar 1 and conductive sheet 3 have good conductivity, they form a tight lock after being riveted together, which can realize stable electrical transmission between busbar 1 and conductive sheet 3. Furthermore, there is no need to solder busbar 1 and conductive sheet 3, which fundamentally avoids the occurrence of cold solder joints and ensures the connection quality and reliability of busbar 1 and conductive sheet 3.

[0052] In a specific example, the busbar 1 has a thickness of approximately 0.3 mm before riveting, and the first connecting portion 31 has a thickness of approximately 0.3 mm before riveting. After riveting, the busbar 1 and the first connecting portion 31 together form a U-shaped riveting groove 33, which serves as a tight locking mechanism. Furthermore, due to the formation of the riveting groove 33, the busbar 1 and the first connecting portion 31 are extended. The thickness of the busbar 1 at the bottom of the riveting groove 33 ranges from 0.1 mm to 0.3 mm, and the thickness of the first connecting portion 31 at the bottom of the riveting groove 33 ranges from 0.04 mm to 0.08 mm.

[0053] In some possible implementations, in order to improve the conductivity between the busbar 1 and the first connection portion 31, conductive adhesive or other composite conductive materials may be added between them.

[0054] In some possible implementations, there are two conductive sheets 3, two busbars 1, and a protection unit 2 and two busbars 1 are disposed between the two conductive sheets 3; the protection unit 2 and the two busbars 1 are spaced apart in the second direction Y, the two busbars 1 are arranged facing each other in the first direction X, and an assembly space is formed between the two busbars 1.

[0055] In this embodiment, the protection unit 2 and the two busbars 1 are spaced apart in the second direction Y, and the two busbars 1 are arranged facing each other in the first direction X. The connection direction of the first connecting part 31 of the busbar 1 and the conductive sheet 3 is the first direction X. When the busbar 1 and the first connecting part 31 are riveted together, they will not interfere with the protection unit 2.

[0056] Moreover, the two busbars 1 are arranged facing each other in the first direction X, and an assembly space is formed between the two busbars 1. This assembly space provides sufficient operating space for the riveting assembly of the busbars 1 and the first connecting part 31, so that the busbars 1 and the first connecting part 31 can be riveted together, and damage to the protection unit 2 is avoided.

[0057] In some possible implementations, the protection unit 2 is a diode. The diode is electrically connected to two conductive plates 3 respectively.

[0058] In some possible embodiments, the wiring device further includes a junction box 4, which has a mounting cavity 45. The protection unit 2 and the conductive sheet 3 are disposed within the mounting cavity 45. The junction box 4 can protect the portion of the busbar 1, the conductive sheet 3, and the protection unit 2 located within the mounting cavity 45. The bottom of the junction box 4 is provided with a guide portion 42 and a through hole 41. The guide portion 42 extends from the wall of the through hole 41 into the mounting cavity 45. One end of the busbar 1 passes through the through hole 41 and is inserted into the mounting cavity 45 at a position limited by the guide portion 42.

[0059] In this embodiment, the through hole 41 allows the manifold 1 to be inserted into the mounting cavity 45. The guide portion 42 restricts the insertion position of the manifold 1, ensuring that the manifold 1 is inserted into the mounting cavity 45 along the position restricted by the guide portion 42. This ensures the accurate relative position between the manifold 1 and the first connecting portion 31, enabling the manifold 1 and the first connecting portion 31 to be riveted together.

[0060] In some possible implementations, the end of the conductive sheet 3 with the first connecting portion 31 is located at the upper end of the guide portion 42, and the first connecting portion 31 extends toward the upper end of the junction box 4; the busbar 1 is higher than the guide portion 42 in the third direction Z, and the busbar 1 extends toward the upper end of the junction box 4.

[0061] In this embodiment, the guide portion 42 can overlap the end of the conductive sheet 3 where the first connecting portion 31 is provided, and the guide portion 42 stably supports the first connecting portion 31, so that the position of the first connecting portion 31 is stable. The riveting position of the first connecting portion 31 and the busbar 1 is located on the upper side of the guide portion 42, which can avoid the guide portion 42 interfering with the riveting assembly of the first connecting portion 31 and the busbar 1.

[0062] In some possible implementations, the bottom of the junction box 4 is also provided with a support part 44, the upper end of which is connected to the conductive sheet 3.

[0063] In this embodiment, the support portion 44 can fix the conductive sheet 3, ensuring its stable position and preventing movement. This avoids inaccurate riveting positions caused by movement of the conductive sheet 3 during the riveting assembly of the first connecting portion 31 and the busbar 1. Furthermore, the support portion 44 can support the conductive sheet 3, preventing a large height difference between the conductive sheet 3 and the end of the conductive sheet 3 with the first connecting portion 31, and avoiding assembly problems caused by this height difference.

[0064] In some possible implementations, after the support portion 44 is connected to the conductive sheet 3, the remaining portion of the conductive sheet 3, except for the first connecting portion 31, is parallel to the bottom of the junction box 4.

[0065] In some possible implementations, the junction box 4 is also provided with a flow guide groove 43, the upper end of which is lower than the upper opening of the junction box 4, and the lower end of which is connected to the outside of the junction box 4; in the third direction Z, the busbar 1 and the conductive sheet 3 are lower than the upper end of the flow guide groove 43; and potting compound is provided inside the junction box 4.

[0066] In this embodiment, during assembly, potting compound is injected into the mounting cavity 45. The potting compound fills the mounting cavity 45, and any excess potting compound flows out through the guide groove 43. The potting compound completely encapsulates the diode leads, solder joints, conductive sheet 3, and part of the busbar 1 located within the mounting cavity 45, forming an insulating layer to prevent short circuits or arcing under high voltage conditions, and especially to prevent power loss due to leakage current in humid environments. The potting compound has high temperature resistance and heat dissipation properties, ensuring stable operation of the diode under abnormal conditions and preventing overheating and burnout. The potting compound fills all gaps within the junction box 4 to form a sealing layer, preventing rainwater and salt spray corrosion, and resisting corrosion from acid rain and dust, maintaining the long-term sealing integrity of the wiring device.

[0067] In this embodiment, on the third direction Z, the busbar 1 and the conductive sheet 3 are lower than the upper end of the guide groove 43. Therefore, the riveting positions of the busbar 1 and the conductive sheet 3, as well as the busbar 1 and the conductive sheet 3, are completely located within the adhesive. The vibration damping and thermal stress release effects of the adhesive can ensure that the busbar 1 and the conductive sheet 3 are always in a riveted state, effectively avoiding connection failure between the conductive sheet 3 and the busbar 1.

[0068] During assembly of the wiring device in this embodiment, the busbar 1 at the lead-out hole of the photovoltaic module 5 is lifted and straightened so that the busbar 1 and the photovoltaic module 5 form a certain angle, such as 85°±5°. The through hole 41 of the junction box 4 is aligned with the upright busbar 1, and the busbar 1 is inserted into the junction box 4 through the through hole 41.

[0069] Then, the riveting head of the riveting mechanism 6 is inserted into the junction box 4. The concave die 62 is located between the two busbars 1. A first connecting part 31 of the busbar 1 and the conductive sheet 3 is provided between each convex die 61 and the concave die 62. The convex die 61 and the concave die 62 are connected for riveting. The busbar 1 and the first connecting part 31 are physically deformed to form a riveting interlocking mechanism, thereby enabling the circuit to conduct.

[0070] In the wiring device of this application embodiment, the first connecting part 31 of the conductive sheet 3 is arranged along the third direction Z, and the part of the busbar 1 located inside the junction box 4 is also arranged along the third direction Z. The first connecting part 31 and the busbar 1 are attached to each other so that the riveting mechanism 6 can perform riveting.

[0071] The wiring device of this embodiment does not require welding equipment during assembly, reducing production costs. Furthermore, it contains no lead or other hazardous substances, complying with RoHS standards (directives restricting the use of certain hazardous substances in electrical and electronic equipment). The busbar 1 and the first connecting part 31 form a riveted interlocking structure, offering advantages such as vibration resistance, aging resistance, and a long service life, for example, greater than 25 years. The busbar 1 and the first connecting part 31 are physically and mechanically connected, requiring no heating and thus avoiding thermal impact on the junction box 4, preventing thermal deformation or aging of the junction box 4.

[0072] The wiring device in this embodiment does not use welding connection, but rivets the conductive sheet 3 and the bus bar 1. Riveting has the advantages of high structural strength and stable connection, effectively avoiding connection failure between the conductive sheet 3 and the bus bar 1, as well as the problem of local abnormal heating of photovoltaic module caused by connection failure, affecting power generation efficiency, or even photovoltaic module failure.

[0073] In some embodiments, this application also provides a photovoltaic system, which includes a photovoltaic module 5 and a wiring device. A busbar 1 of the wiring device is led out from the photovoltaic module 5, and the wiring device is as described above. The busbar 1 and the conductive sheet 3 in the wiring device are riveted together. Riveting has the advantages of high structural strength and stable connection, thereby extending the stability and service life of the photovoltaic system.

[0074] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0075] The various embodiments in this specification are described in a related manner. Similar or identical parts between embodiments can be referred to mutually. Each embodiment focuses on describing the differences from other embodiments. For embodiments of devices, electronic devices, computer-readable storage media, and computer program products containing instructions, the descriptions are relatively simple because they are basically similar to the method embodiments; relevant parts can be referred to the descriptions of the method embodiments.

[0076] The above description is merely a preferred embodiment of this utility model and is not intended to limit the scope of protection of this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model are included within the scope of protection of this utility model.

Claims

1. A wiring device, characterized in that, The wiring device includes a busbar (1), a protection unit (2), and a conductive sheet (3); The busbar (1) and the protection unit (2) are disposed on one side of the conductive sheet (3) along the first direction (X), and the busbar (1) and the protection unit (2) are spaced apart along the second direction (Y). The busbar (1) is mechanically connected to the conductive sheet (3), and the protection unit (2) is electrically connected to the conductive sheet (3).

2. The wiring device of claim 1, wherein, The conductive sheet (3) has a first connecting part (31) on one side in the first direction (X). The first connecting part (31) and the busbar (1) extend along the third direction (Z) respectively. The first connecting part (31) and the busbar (1) are mechanically connected. The first direction (X), the second direction (Y) and the third direction (Z) are perpendicular to each other.

3. The wiring device of claim 2, wherein, The first connecting part (31) and the busbar (1) are riveted together.

4. The wiring device of claim 3, wherein, A riveting groove (33) is formed at the riveting joint of the first connecting part (31) and the busbar (1). The depth of the riveting groove (33) is H1, the thickness of the first connecting part (31) is H2, and the thickness of the busbar (1) is H3, satisfying that H1 > H2 + H3.

5. The wiring device of claim 1, wherein, Two conductive sheets (3) are provided, two busbars (1) are provided, and the protection unit (2) and the two busbars (1) are located between the two conductive sheets (3); The protection unit (2) and the two busbars (1) are spaced apart in the second direction (Y), and the two busbars (1) are arranged facing each other in the first direction (X), forming an assembly space between the two busbars (1).

6. The wiring device of claim 1, wherein, The wiring device also includes a junction box (4), which has an installation cavity (45) inside. The protection unit (2) and the conductive sheet (3) are located inside the installation cavity (45). The junction box (4) has a guide part (42) and a through hole (41) at its bottom. The guide part (42) extends from the wall of the through hole (41) into the mounting cavity (45). One end of the busbar (1) passes through the through hole (41) and is inserted into the mounting cavity (45) at a position limited by the guide part (42).

7. The wiring device of claim 6, wherein, The conductive sheet (3) has a first connecting part (31) at its end located at the upper end of the guide part (42), and the first connecting part (31) extends toward the upper end of the junction box (4); the busbar (1) is higher than the guide part (42) in the third direction (Z), and the busbar (1) extends toward the upper end of the junction box (4).

8. The wiring device of claim 7, wherein, The junction box (4) is also provided with a support part (44) at the bottom, and the upper end of the support part (44) is connected to the conductive sheet (3).

9. The wiring device of claim 6, wherein, The junction box (4) is also provided with a flow guide groove (43), the upper end of the flow guide groove (43) is lower than the upper opening of the junction box (4), and the lower end of the flow guide groove (43) is connected to the outside of the junction box (4). On the third direction (Z), the busbar (1) and the conductive sheet (3) are lower than the upper end of the guide groove (43); the junction box (4) is provided with potting compound.

10. A photovoltaic system characterized by, It includes a photovoltaic module (5) and a wiring device, wherein a busbar (1) of the wiring device is led out from the photovoltaic module (5), and the wiring device is the wiring device as described in any one of claims 1-9.

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