Conductive assembly and photovoltaic junction box

Abstract

The embodiment of the utility model provides a conductive assembly, which is arranged in a photovoltaic junction box and electrically connected between a photovoltaic assembly and an external circuit, and comprises a first electrode electrically connected with the photovoltaic assembly; the second electrode is electrically connected between the photovoltaic module and the external circuit; the diode module is arranged between the first electrode and the second electrode, and the conduction direction of the diode module is from the first electrode to the second electrode; wherein the first electrode and / or the second electrode are / is composed of double-layer conducting strips, and a gap is formed between the double-layer conducting strips. According to the conductive assembly provided by the embodiment of the utility model, by optimizing the conductive sheet structure of the photovoltaic junction box, the junction temperature of the photovoltaic junction box is reduced, and the safe bearing current limit of the photovoltaic junction box is improved. The embodiment of the invention also provides a photovoltaic junction box.

Description

Technical Field

[0001] The embodiments of the present application relate to the field of photovoltaic technology, and in particular to a conductive component and a photovoltaic junction box. Background Art

[0002] With the rapid development of social economy, the reserves of non-renewable energy such as oil and coal are becoming less and less, and the prices are getting higher and higher. As one of the important clean energy sources, the technology of utilizing solar energy is getting more and more valued and widely used, such as solar collectors and solar panels.

[0003] The photovoltaic junction box is a connector between the solar cell array composed of solar cell modules and the solar charging control device and other equipment. The photovoltaic junction box is very important in the composition of solar modules. Its main function is to connect the power generated by solar cells to external circuits.

[0004] With the application of large-size photovoltaic module technology, the current in the module continues to increase, resulting in an increase in the junction temperature of the junction box, which poses a high potential long-term safety risk. Existing large-current photovoltaic junction boxes usually increase the size of the photovoltaic junction box to increase the area of ​​the conductive sheet and improve the heat dissipation capacity of the photovoltaic junction box, or increase the chip specifications to reduce the heat generation of the diode, thereby increasing the size of the device or manufacturing cost. Utility Model Content

[0005] To achieve the above objectives, the embodiments of the present application provide a conductive component and a photovoltaic junction box, which optimize the conductive sheet structure of the photovoltaic junction box, thereby reducing the junction temperature of the photovoltaic junction box and improving the safe current carrying capacity of the photovoltaic junction box.

[0006] In a first aspect, an embodiment of the present application provides a conductive component, which is disposed in a photovoltaic junction box and electrically connected between a photovoltaic component and an external circuit, comprising:

[0007] A first electrode electrically connected to the photovoltaic module;

[0008] A second electrode electrically connected between the photovoltaic module and the external circuit; and

[0009] A diode module is arranged between the first electrode and the second electrode, and the conducting direction of the diode module is from the first electrode to the second electrode;

[0010] The first electrode and / or the second electrode is composed of a double-layer conductive sheet, and a gap is provided between the double-layer conductive sheets.

[0011] Furthermore, the double-layer conductive sheet includes an upper conductive sheet and a lower conductive sheet, the lower conductive sheet is dumbbell-shaped, and a first notch is provided on the side of the lower conductive sheet, the upper conductive sheet is U-shaped, and the upper conductive sheet includes a curling edge, and the curling edge is arranged on the inner side of the side of the upper conductive sheet, and the upper conductive sheet is welded to the first notch of the lower conductive sheet through the curling edge, thereby being fixed to the lower conductive sheet.

[0012] Furthermore, a welding point between the curling edge of the upper conductive sheet and the first notch of the lower conductive sheet is located on the back side of the lower conductive sheet.

[0013] Furthermore, the outer side surface of the side edge of the upper conductive sheet and the side edge of the lower conductive sheet are located on the same plane, and the bottom surface of the curled edge of the upper conductive sheet and the bottom surface of the lower conductive sheet are located on the same plane.

[0014] Furthermore, it also includes a heat conduction part, the top surface of the upper conductive sheet is provided with a hollow area, and the heat conduction part is filled from the hollow area to the gap between the double-layer conductive sheets.

[0015] Furthermore, the size of the gap between the double-layer conductive sheets is between 0.8 and 3 mm.

[0016] Furthermore, the thickness of the upper conductive sheet is between 0.5 and 0.8 mm, and the thickness of the lower conductive sheet is between 0.5 and 1 mm.

[0017] Furthermore, the lower conductive sheet is provided with a mounting hole, and the lower conductive sheet is fixed to the box body of the photovoltaic junction box through the mounting hole.

[0018] Furthermore, it also includes a bus bar, a second notch is provided on the side of the upper conductive sheet facing the diode module, a lead-out hole is provided on the side of the lower conductive sheet facing the diode module, and the bus bar passes through the lead-out hole and is welded to the second notch of the upper conductive sheet.

[0019] In a second aspect, an embodiment of the present application further provides a photovoltaic junction box, comprising a box body and a conductive component as described in any one of the above items, wherein the conductive component is disposed in the box body.

[0020] Compared with the existing conductive component scheme, the conductive component provided in the embodiment of the present application is arranged in the photovoltaic junction box and electrically connected between the photovoltaic component and the external circuit. The first electrode is electrically connected to the front grating of the photovoltaic component to collect the current on the front of the photovoltaic component, and the second electrode is electrically connected to the back grating of the photovoltaic component to collect the current on the back of the photovoltaic component. The second electrode is electrically connected between the photovoltaic component and the external circuit. The power generated by the photovoltaic component can be transmitted to the external circuit through the first electrode and the second electrode. The diode module is arranged between the first electrode and the second electrode. The conduction direction of the diode module is from the first electrode to the second electrode. The function of the diode module is to only allow the power generated by the photovoltaic component to flow to the external device, and not allow the current of the external device to flow back to the photovoltaic component, thereby protecting the photovoltaic component and preventing the photovoltaic component from being burned. The first electrode and / or the second electrode are composed of a double-layer conductive sheet, and a gap is provided between the double-layer conductive sheets. The double-layer conductive sheet provided in the embodiment of the present application can increase the current flow area, thereby improving the heat dissipation capacity of the conductive sheet, thereby reducing the junction temperature of the photovoltaic junction box, and achieving the purpose of improving the safe current carrying capacity of the photovoltaic junction box.

[0021] Therefore, the conductive component provided in the embodiment of the present application can adapt to large-current photovoltaic junction boxes. Without increasing the size of the photovoltaic junction box or improving the specifications of the diode chip, the heat dissipation capacity of the junction box is improved by optimizing the conductive sheet structure of the photovoltaic junction box. Therefore, the conductive component provided in the embodiment of the present application has a simple structure and low manufacturing cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0023] Figure 1 A schematic diagram of the three-dimensional structure of a conductive component provided in an embodiment of the present application;

[0024] Figure 2 for Figure 1 Another three-dimensional structural schematic diagram of a conductive component, wherein the bus bar is not shown;

[0025] Figure 3 for Figure 1 A schematic diagram of the three-dimensional structure of the upper conductive sheet of the conductive component;

[0026] Figure 4 yes Figure 1 A schematic diagram of the three-dimensional structure of the lower conductive sheet of the conductive component;

[0027] Figure 5 for Figure 4 Schematic diagram of the connection status of the lower conductive sheet.

[0028] Description of Figure Numbers:

[0029] Label name Label name 100 Conductive components 101 First electrode 102 Second electrode 103 Diode Module 201 Upper conductive sheet 202 Lower conductive sheet 211 crimping 221 First Gap 212 Side 104 Heat transfer part 222 Mounting holes 105 Busbar 213 The second gap 223 Lead hole

[0030] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0032] It should be noted that all directional indications in the embodiments of the present application (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0033] In addition, the descriptions of "first", "second", etc. in this application are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in this field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0034] Reference Figure 1 and Figure 2 , Figure 1 and Figure 2It is a schematic diagram of the three-dimensional structure of the conductive component 100 provided in an embodiment of the present application. The conductive component 100 is arranged in a photovoltaic junction box and is electrically connected between the photovoltaic component and an external circuit. It includes a first electrode 101, a second electrode 102 and a diode module 103, wherein the first electrode 101 is electrically connected to the photovoltaic component, the second electrode 102 is electrically connected between the photovoltaic component and the external circuit, the diode module 103 is arranged between the first electrode 101 and the second electrode 102, the conduction direction of the diode module 103 is from the first electrode 101 to the second electrode 102, the first electrode 101 and / or the second electrode 102 are composed of a double-layer conductive sheet, and a gap is provided between the double-layer conductive sheets.

[0035] Specifically, Figure 1 and Figure 2 As shown, the photovoltaic junction box is a connector between the solar cell array composed of solar cell modules and the solar charging control device and other equipment. The photovoltaic junction box is very important in the composition of solar modules. Its main function is to connect the power generated by the solar cell to the external circuit.

[0036] The conductive component 100 provided in the embodiment of the present application is arranged in the photovoltaic junction box and electrically connected between the photovoltaic component and the external circuit. The first electrode 101 is usually a positive electrode, which is electrically connected to the front grating of the photovoltaic component to collect the current on the front of the photovoltaic component, and the second electrode 102 is usually a negative electrode, which is electrically connected to the back grating of the photovoltaic component to collect the current on the back of the photovoltaic component. The second electrode 102 is electrically connected between the photovoltaic component and the external circuit. Therefore, the power generated by the photovoltaic component can be transmitted to the external circuit through the first electrode 101 and the second electrode 102. The diode module is arranged between the first electrode 101 and the second electrode 102. The diode module 103 is usually composed of a diode and a packaging structure. The diode is arranged in the packaging structure. The conduction direction of the diode module 103 is from the first electrode 101 to the second electrode 102. The function of the diode module 103 is to only allow the power generated by the photovoltaic component to flow to the external device, and not allow the current of the external device to flow back to the photovoltaic component, thereby protecting the photovoltaic component and preventing the photovoltaic component from being burned.

[0037] The first electrode 101 and / or the second electrode 102 are composed of a double-layer conductive sheet, and a gap is provided between the double-layer conductive sheets. Compared with the single-layer conductive sheet structure of the existing photovoltaic junction box, the double-layer conductive sheet provided in the embodiment of the present application can increase the current flow area, thereby improving the heat dissipation capacity of the conductive sheet, thereby reducing the junction temperature of the photovoltaic junction box, and improving the safe current carrying capacity of the photovoltaic junction box. Therefore, the conductive component 100 provided in the embodiment of the present application can be adapted to a photovoltaic junction box with a large current. Without increasing the size of the photovoltaic junction box or improving the specifications of the diode chip, the heat dissipation capacity of the junction box is improved by optimizing the conductive sheet structure of the photovoltaic junction box. Therefore, the conductive component 100 provided in the embodiment of the present application has a simple structure and low manufacturing cost.

[0038] Further, refer to Figures 3 to 5 In some embodiments of the present application, the double-layer conductive sheet includes an upper conductive sheet 201 and a lower conductive sheet 202, the lower conductive sheet 202 is dumbbell-shaped, and a first notch 221 is provided on the side of the lower conductive sheet 202, the upper conductive sheet 201 is U-shaped, and the upper conductive sheet 201 includes a curling edge 211, and the curling edge 211 is arranged on the inner side of the side 212 of the upper conductive sheet 201, and the upper conductive sheet 201 is welded to the first notch 221 of the lower conductive sheet 202 through the curling edge 211, thereby being fixed to the lower conductive sheet 202.

[0039] Specifically, the upper conductive sheet 201 is U-shaped, and the lower conductive sheet 202 is dumbbell-shaped. The upper conductive sheet 201 is welded to the first notch 221 of the lower conductive sheet 202 through the crimping 211, so as to be fixed to the lower conductive sheet 202, thereby forming a gap between the upper conductive sheet 201 and the lower conductive sheet 202. Compared with the single-layer conductive sheet structure of the existing photovoltaic junction box, the double-layer conductive sheet provided in the embodiment of the present application can increase the current flow area, thereby improving the heat dissipation capacity of the conductive sheet, thereby reducing the junction temperature of the photovoltaic junction box, and achieving the purpose of improving the safe current carrying capacity of the photovoltaic junction box. Therefore, the conductive component 100 provided in the embodiment of the present application can be suitable for photovoltaic junction boxes with large currents. Without increasing the size of the photovoltaic junction box or improving the specifications of the diode chip, the heat dissipation capacity of the junction box is improved by optimizing the conductive sheet structure of the photovoltaic junction box. Therefore, the conductive component 100 provided in the embodiment of the present application has a simple structure and low manufacturing cost.

[0040] In addition, in some embodiments of the present application, the welding point of the curling edge 211 of the upper conductive sheet 201 and the first notch 221 of the lower conductive sheet 202 is located on the back of the lower conductive sheet 202. Therefore, the welding point of the curling edge 211 of the upper conductive sheet 201 and the first notch 221 of the lower conductive sheet 202 is relatively farther from the diode module 103, and during welding, the lower conductive sheet 202 will play a certain protective role on the diode module 103, which is conducive to the high temperature generated during the welding process to affect the diode module 103, thereby improving the service life of the photovoltaic junction box.

[0041] Further, refer again to Figure 1 and Figure 2 In some embodiments of the present application, the outer side surface of the side edge 212 of the upper conductive sheet 201 and the side edge of the lower conductive sheet 202 are located on the same plane, and the bottom surface of the curling edge 211 of the upper conductive sheet 201 and the bottom surface of the lower conductive sheet 202 are located on the same plane. Therefore, the curling edge 211 of the upper conductive sheet 201 can be completely embedded in the first notch 221 of the lower conductive sheet 202, thereby improving the integrity of the upper conductive sheet 201 and the lower conductive sheet 202, which is conducive to improving the aesthetics of the conductive assembly 100.

[0042] Reference Figure 1 and Figure 2 In some embodiments of the present application, the conductive component 100 further includes a heat-conducting portion 104, and the upper conductive sheet 201 is provided with a hollow area, and the heat-conducting portion 104 is filled from the hollow area into the gap of the double-layer conductive sheet. The heat-conducting portion 104 is generally made of potting glue, etc., and the potting glue is filled into the gap of the double-layer conductive sheet through the hollow area of ​​the upper conductive sheet 201. When the potting glue solidifies, the heat-conducting portion 104 is formed, thereby enhancing the heat dissipation efficiency between the upper conductive sheet 201 and the lower conductive sheet 202, further improving the heat dissipation capacity of the conductive component 100, and further reducing the junction temperature of the photovoltaic junction box, so as to improve the safe carrying current rating of the photovoltaic junction box. Therefore, the conductive component 100 provided in the embodiment of the present application can be applied to photovoltaic junction boxes with large currents. Without increasing the size of the photovoltaic junction box or improving the specifications of the diode chip, the heat dissipation capacity of the junction box is improved by optimizing the conductive sheet structure of the photovoltaic junction box. Therefore, the conductive component 100 provided in the embodiment of the present application has a simple structure and low manufacturing cost.

[0043] In some embodiments of the present application, the size of the gap between the double-layer conductive sheets is between 0.8 and 3 mm. The gap between the double-layer conductive sheets is not too small, otherwise it will affect the heat dissipation capacity of the conductive sheets, nor is it too large, otherwise it will increase the size of the device and increase the manufacturing cost. Therefore, in the conductive component 100 provided in the embodiment of the present application, the size of the gap between the double-layer conductive sheets is between 0.8 and 3 mm, which can ensure the heat dissipation capacity of the conductive sheets, and at the same time will not increase the size of the conductive sheets, so as not to increase the manufacturing cost.

[0044] In some embodiments of the present application, the thickness of the upper conductive sheet 201 is between 0.5 and 0.8 mm, and the thickness of the lower conductive sheet 202 is between 0.5 and 1 mm. In addition, the upper conductive sheet 201 is usually made of metal copper, and its surface is usually tin-plated. The role of tin plating is to facilitate the welding of the bus bar 105 to the upper conductive sheet 201, while the lower conductive sheet 202 is usually made of metal copper or aluminum, and its surface is not tin-plated. The thickness of the upper conductive sheet 201 is between 0.5 and 0.8 mm, and the thickness of the lower conductive sheet 202 is between 0.5 and 1 mm, which can ensure the strength of the conductive sheet and save manufacturing costs.

[0045] In addition, refer to Figure 1 , Figure 2 , Figure 4 and Figure 5 In some embodiments of the present application, the lower conductive sheet 202 is provided with a mounting hole 222, and the lower conductive sheet 202 is fixed to the box body of the photovoltaic junction box through the mounting hole 222. The conductive assembly 100 provided in the embodiment of the present application is arranged in the photovoltaic junction box. Specifically, the conductive assembly 100 is fixed to the box body of the photovoltaic junction box through the mounting hole 222 of the lower conductive sheet 202. When installing the conductive assembly 100, the operator passes a screw or the like through the mounting hole 222, thereby fixing the lower conductive sheet 202 to the box body of the photovoltaic junction box, so that the conductive assembly 100 can be fixed in the box body of the photovoltaic junction box.

[0046] Refer again Figure 1 In some embodiments of the present application, the conductive component 100 further includes a bus bar 105, a second notch 213 is provided on the side of the upper conductive sheet 201 facing the diode module 103, a lead-out hole 223 is provided on the side of the lower conductive sheet 202 facing the diode module 103, and the bus bar 105 passes through the lead-out hole 223 and is welded to the second notch 213 of the upper conductive sheet 201.

[0047] Specifically, the function of the busbar 105 is to conduct the current in the photovoltaic module to the first electrode 101 and the second electrode 102. The busbar 105 passes through the lead-out hole 223 of the lower conductive sheet 202 and is welded to the second notch 213 of the upper conductive sheet 201, rather than being welded to the lower conductive sheet 202. Since there is a gap between the upper conductive sheet 201 and the lower conductive sheet 202, the distance between the upper conductive sheet 201 and the diode module 103 is relatively far. Therefore, the embodiment of the present application can avoid the high temperature generated in the welding area during the welding process of the busbar 105 or when power is turned on, which may damage the diode module 103, thereby further improving the service life of the photovoltaic junction box.

[0048] It should be noted that if Figure 1 As shown, there are two bus bars 105, one of which is electrically connected to the first electrode 101, and its function is to conduct the current on the front side of the photovoltaic module to the first electrode 101, and the other bus bar 105 is electrically connected to the second electrode 102, and its function is to conduct the current on the back side of the photovoltaic module to the second electrode 102. The welding method of the bus bar 105 and the double-layer conductive sheet of the first electrode 101 and / or the second electrode 102 is as described above, thereby avoiding high temperature damage to the diode module 103 during welding or power-on, thereby further improving the service life of the photovoltaic junction box.

[0049] The embodiment of the present application also provides a junction box, including a box body and the conductive component 100 as described above, and the conductive component is arranged in the box body. The specific structure of the conductive component 100 refers to the above embodiment. Since the conductive component 100 adopts all the technical solutions of all the above embodiments, it at least has all the beneficial effects brought by the technical solutions of the above embodiments, which will not be repeated here one by one.

[0050] In addition, the embodiment of the present application also provides a photovoltaic system, including a photovoltaic component and a junction box as described above, the junction box includes a box body and the conductive component 100 described above, and the conductive component is arranged in the box body. The specific structure of the conductive component 100 refers to the above embodiment. Since the conductive component 100 adopts all the technical solutions of all the above embodiments, it at least has all the beneficial effects brought by the technical solutions of the above embodiments, which will not be repeated here one by one.

[0051] The above description is only a preferred embodiment of the present application, and does not limit the patent scope of the present application. All equivalent structural changes made by using the contents of the present application specification and drawings under the inventive concept of the present application, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present application.

Claims

1. A conductive component, arranged in a photovoltaic junction box and electrically connected between a photovoltaic component and an external circuit, characterized in that: include: A first electrode electrically connected to the photovoltaic module; A second electrode electrically connected between the photovoltaic module and the external circuit; and A diode module is arranged between the first electrode and the second electrode, and the conducting direction of the diode module is from the first electrode to the second electrode; The first electrode and / or the second electrode is composed of a double-layer conductive sheet, and a gap is provided between the double-layer conductive sheets.

2. The conductive component according to claim 1, characterized in that The double-layer conductive sheet includes an upper conductive sheet and a lower conductive sheet, the lower conductive sheet is dumbbell-shaped, and a first notch is provided on the side of the lower conductive sheet, the upper conductive sheet is U-shaped, and the upper conductive sheet includes a curling edge, and the curling edge is arranged on the inner side of the side of the upper conductive sheet, and the upper conductive sheet is welded to the first notch of the lower conductive sheet by the curling edge, thereby being fixed to the lower conductive sheet.

3. The conductive component according to claim 2, characterized in that The welding point between the curling edge of the upper conductive sheet and the first notch of the lower conductive sheet is located on the back side of the lower conductive sheet.

4. The conductive component according to claim 3, characterized in that: The outer side surface of the side edge of the upper conductive sheet and the side edge of the lower conductive sheet are located on the same plane, and the bottom surface of the curled edge of the upper conductive sheet and the bottom surface of the lower conductive sheet are located on the same plane.

5. The conductive component according to claim 4, characterized in that It also includes a heat-conducting portion, the top surface of the upper conductive sheet is provided with a hollow area, and the heat-conducting portion is filled from the hollow area to the gaps between the double-layer conductive sheets.

6. The conductive component according to claim 5, characterized in that The size of the gap between the double-layer conductive sheets is between 0.8 and 3 mm.

7. The conductive component according to claim 6, characterized in that The thickness of the upper conductive sheet is between 0.5 and 0.8 mm, and the thickness of the lower conductive sheet is between 0.5 and 1 mm.

8. The conductive component according to claim 7, characterized in that: The lower conductive sheet is provided with a mounting hole, and the lower conductive sheet is fixed to the box body of the photovoltaic junction box through the mounting hole.

9. The conductive component according to any one of claims 2 to 8, characterized in that: It also includes a bus bar, a second notch is provided on the side of the upper conductive sheet facing the diode module, a lead-out hole is provided on the side of the lower conductive sheet facing the diode module, and the bus bar passes through the lead-out hole and is welded to the second notch of the upper conductive sheet.

10. A photovoltaic junction box, characterized in that: It comprises a box body and a conductive component according to any one of claims 1 to 9, wherein the conductive component is arranged in the box body.

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