Junction box and photovoltaic module

Abstract

The utility model discloses a junction box and photovoltaic module, including box body and wire, the bottom of box body is provided with electrically conductive contact, and electrically conductive contact extends from the inside of box body to the bottom and protrudes from the bottom of box body, and wire is arranged on box body, and is electrically connected with electrically conductive contact.

Description

Technical Field

[0001] This utility model relates to the field of photovoltaic technology, and in particular to a junction box and a photovoltaic module. Background Technology

[0002] In photovoltaic (PV) cell technology, back contact (BC) technology improves conversion efficiency by removing the front-side grid lines of the solar cell and placing electrodes only on the back side, thus reducing front-side shading. The junction box is also installed on the back of the PV module. In existing technology, junction box installation involves first leading a busbar from inside the PV module and then inserting the busbar into the junction box from the bottom, a method that is not particularly convenient. Utility Model Content

[0003] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes a junction box and a photovoltaic module, in which conductive contacts are provided at the bottom of the junction box, which simplifies the assembly method of the junction box.

[0004] On one hand, this utility model embodiment provides a junction box, including:

[0005] The box body has conductive contacts at the bottom, which extend from the inside of the box body to the bottom and protrude from the bottom of the box body.

[0006] A wire is disposed on the housing and is electrically connected to the conductive contact.

[0007] According to some embodiments of the present invention, the surface of the conductive contact is provided with a gold plating layer.

[0008] According to some embodiments of this utility model, the elastic modulus of the conductive contact is 110~120 GPa.

[0009] According to some embodiments of this utility model, the number of conductive contacts is two, and a diode is connected between the two conductive contacts.

[0010] According to some embodiments of this utility model, the box body is provided with a buckle.

[0011] On the other hand, this utility model embodiment provides a photovoltaic module, including the junction box described above.

[0012] According to some embodiments of the present invention, the photovoltaic module further includes a back glass, a back film, a solar cell, a front glass, and a front film. The back glass, the solar cell, and the front glass are stacked sequentially. The back glass is bonded to the solar cell through the back film, and the front glass is bonded to the solar cell through the front film. A through hole is provided on the back glass, and a lead-out contact is provided in the through hole. The conductive contact of the junction box is inserted into the through hole and electrically connected to the lead-out contact.

[0013] According to some embodiments of the present invention, the junction box is attached to the back glass, and a sealant is applied between the junction box and the back glass.

[0014] According to some embodiments of the present invention, the back glass is further provided with interconnecting strips and busbars, and the lead-out contacts are disposed on the busbars.

[0015] According to some embodiments of this utility model, the back glass is provided with snap-fit ​​holes.

[0016] The embodiments of this utility model have at least the following beneficial effects:

[0017] The bottom of the junction box has conductive contacts that extend from the inside of the box to the bottom and protrude from it. Wires are mounted on the box and are electrically connected to these contacts. This allows for plug-in connections via the conductive contacts during use, simplifying the assembly of the junction box.

[0018] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0019] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0020] Figure 1 This is one of the structural schematic diagrams of the junction box according to an embodiment of the present utility model;

[0021] Figure 2 This is a second schematic diagram of the junction box according to an embodiment of the present utility model;

[0022] Figure 3 This is a schematic diagram of the stacked structure of the photovoltaic module according to an embodiment of the present utility model;

[0023] Figure 4 This is a schematic diagram of the planar structure of the back glass in an embodiment of the present utility model;

[0024] Figure 5 This is a planar perspective structural diagram of a photovoltaic module according to an embodiment of the present utility model;

[0025] Figure 6 This is the third schematic diagram of the junction box in an embodiment of this utility model.

[0026] Figure label:

[0027] Junction box 100, box body 110, conductive contact 111, fastener 112, wire 120, back glass 200, through hole 201, interconnecting strip 210, conductive pad 211, busbar 220, lead-out contact 221, back adhesive film 300, battery cell 400, conductive solder joint 410, front glass 500, front adhesive film 600. Detailed Implementation

[0028] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0029] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0030] In the description of this utility model, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. If "first," "second," etc., are used in the description, they are only for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the sequential relationship of the indicated technical features.

[0031] In the description of this utility model, unless otherwise explicitly defined, the terms "setting", "installation", "connection", etc. should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in combination with the specific content of the technical solution.

[0032] Please refer to Figure 1 and Figure 2This embodiment discloses a junction box 100 applied to photovoltaic modules. The junction box 100 includes a box body 110 and a wire 120. A conductive contact 111 is provided at the bottom of the box body 110, extending from the inside of the box body 110 to the bottom and protruding from the bottom of the box body 110. The wire 120 is disposed on the box body 110 and is conductively connected to the conductive contact 111. In use, a plug-in connection can be achieved through the conductive contact 111, which simplifies the assembly method of the junction box 100.

[0033] The surface of the conductive contact 111 is provided with a gold plating layer, which can significantly reduce the contact resistance between the conductive contact 111 and the lead-out contact 221 mentioned below, ensuring the stability and efficiency of current transmission. Moreover, the gold plating layer has extremely strong anti-oxidation and anti-corrosion capabilities, which can effectively protect the conductive contact 111 and ensure the conductivity reliability of the conductive contact 111.

[0034] The conductive contact 111 has an elastic modulus of 110~120GPa and a certain rigidity. It is not easy to undergo elastic deformation when subjected to force. During assembly, the junction box 100 can be installed by press fitting, which helps to simplify the assembly method.

[0035] There are two conductive contacts 111, and a diode is connected between the two conductive contacts 111. The diode can play a protective role, such as preventing hot spot effect, reverse charging or short circuit, and improving the reliability of photovoltaic module operation.

[0036] This embodiment also provides a photovoltaic module, including the junction box 100 described above. In use, a plug-in connection can be achieved through the conductive contacts 111, simplifying the assembly method of the junction box 100.

[0037] Please refer to Figure 3The photovoltaic module also includes a back glass 200, a back film 300, a solar cell 400, a front glass 500, and a front film 600. The back glass 200, the solar cell 400, and the front glass 500 are stacked in sequence. The back glass 200 is bonded to the solar cell 400 by the back film 300, and the front glass 500 is bonded to the solar cell 400 by the front film 600. A through hole 201 is provided on the back glass 200, and a lead-out contact 221 is provided in the through hole 201. The conductive contact 111 of the junction box 100 is inserted into the through hole 201 and is conductively connected to the lead-out contact 221. A through hole 201 is pre-set on the back glass 200, and a lead-out contact 221 is provided within the through hole 201. The conductive contact 111 of the junction box 100 can be inserted into the through hole 201 of the back glass 200 and make contact with the lead-out contact 221 within the through hole 201, thereby realizing the conductive connection between the conductive contact 111 and the lead-out contact 221. It should be understood that the lead-out contact 221 has conductive properties and can realize current transmission. The lead-out contact 221 can transmit the electrical energy generated by the battery cell 400 to the junction box 100, and then transmit it externally through the junction box 100.

[0038] Please refer to Figure 4 The back glass 200 is also provided with interconnecting strips 210 and busbars 220, with lead-out contacts 221 provided on the busbars 220. In traditional photovoltaic modules, the glass structure is usually a flat and smooth structure without any circuitry. However, in this embodiment, circuitry is prefabricated on the back glass 200. The prefabricated circuitry includes interconnecting strips 210 and busbars 220. By replacing the traditional solder strips with interconnecting strips 210, interconnection between multiple solar cells 400 can be achieved. Since the busbars 220 are prefabricated on the back glass 200, the welding process between the busbars 220 and the solder strips can be eliminated. Furthermore, the lead-out contact 221 is located on the busbar 220, eliminating the need to extend the busbar 220 out of the back glass 200. During the assembly of the junction box 100, it is unnecessary to insert the busbar 220 into the junction box 100; instead, the conductive contact 111 of the junction box 100 can be inserted into the through hole 201 of the back glass 200, achieving a conductive connection between the conductive contact 111 and the lead-out contact 221. This simple and convenient installation method improves assembly efficiency. In addition, in traditional processes, the insertion step between the busbar 220 and the junction box 100 is difficult to complete with automated equipment due to the uncertain end position of the busbar 220 and the non-programmed insertion action. However, this embodiment changes the assembly method of the junction box 100 to an insertion method, allowing automated equipment to automatically position the conductive contact 111 of the junction box 100 against the through hole 201 of the back glass 200, thus achieving the insertion of the junction box 100 with automated equipment and improving assembly efficiency.

[0039] Please refer to Figure 3 , Figure 4 and Figure 5 The interconnecting strip 210 is provided with conductive pads 211, and the battery cell 400 is provided with conductive solder joints 410. The conductive pads 211 and conductive solder joints 410 are welded together. The interconnecting strip 210 is divided into N-type interconnecting strips and P-type interconnecting strips. The N-type interconnecting strip is used to connect to the negative terminal of the battery cell 400, and the N-type interconnecting strip is provided with N-type conductive pads, such as... Figure 4 The square pads shown on the left, and the P-type interconnects are used to connect the positive electrode of the solar cell 400. The P-type interconnects have P-type conductive pads, such as... Figure 4 The circular pads are shown on the right. It should be noted that the shape of the conductive pads 211 shown in the figure is only for distinguishing types and is not the actual shape of the pads. Interconnect strips 210 of the same type are connected to corresponding busbars 220 to output electrical energy through the busbars 220. The solar cell 400 also has embedded grid lines, and conductive solder joints 410 are connected to these embedded grid lines, thereby transmitting the electrical energy generated by the solar cell 400 to the pre-fabricated circuitry of the back glass 200 through the conductive solder joints 410. The N-type interconnect strips, solar cell 400, and P-type interconnect strips form a current loop, thereby transmitting electrical energy to the lead-out contacts 221 of the busbar 220, and then outputting the electrical energy externally through the junction box 100.

[0040] Junction box 100 is mounted on the back glass 200, and sealant is applied between junction box 100 and back glass 200. The sealant seals the gap between junction box 100 and back glass 200, reducing the impact of environmental moisture, dust, and other factors on the current transmission performance between conductive contacts 111 and lead-out contacts 221 of junction box 100. Furthermore, the sealant acts as an adhesive between junction box 100 and back glass 200, ensuring a reliable connection between them.

[0041] Please refer to Figure 6 The box body 110 is provided with a snap fastener 112, which can snap and fix the junction box 100. Correspondingly, the back glass 200 is provided with snap holes. The number, position and size of the snap holes are adapted to the number, position and size of the snap fastener 112. In this way, the snap connection between the junction box 100 and the back glass 200 can be realized through the cooperation of the snap fastener 112 and the snap holes, which helps to simplify the assembly process.

[0042] The embodiments of the present utility model have been described in detail above with reference to the accompanying drawings. However, the present utility model is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present utility model.

Claims

1. A junction box, characterized in that, include: The box body (110) has a conductive contact (111) at the bottom. The conductive contact (111) extends from the inside of the box body (110) to the bottom and protrudes from the bottom of the box body (110). A wire (120) is disposed on the housing (110) and is electrically connected to the conductive contact (111).

2. The junction box according to claim 1, characterized in that, The surface of the conductive contact (111) is provided with a gold plating layer.

3. The junction box according to claim 1 or 2, characterized in that, The elastic modulus of the conductive contact (111) is 110~120 GPa.

4. The junction box according to claim 1 or 2, characterized in that, There are two conductive contacts (111), and a diode is connected between the two conductive contacts (111).

5. The junction box according to claim 1, characterized in that, The box body (110) is provided with a fastener (112).

6. A photovoltaic module, characterized in that, Includes the junction box as described in any one of claims 1 to 5.

7. The photovoltaic module according to claim 6, characterized in that, The photovoltaic module further includes a back glass (200), a back film (300), a solar cell (400), a front glass (500), and a front film (600). The back glass (200), the solar cell (400), and the front glass (500) are stacked in sequence. The back glass (200) is bonded to the solar cell (400) by the back film (300), and the front glass (500) is bonded to the solar cell (400) by the front film (600). A through hole (201) is provided on the back glass (200), and a lead-out contact (221) is provided in the through hole (201). The conductive contact (111) of the junction box is inserted into the through hole (201) and is conductively connected to the lead-out contact (221).

8. The photovoltaic module according to claim 7, characterized in that, The junction box is attached to the back glass (200), and a sealant is applied between the junction box and the back glass (200).

9. The photovoltaic module according to claim 7, characterized in that, The back glass (200) is also provided with a connected interconnecting strip (210) and a busbar (220), and the lead-out contact (221) is provided on the busbar (220).

10. The photovoltaic module according to claim 7, 8 or 9, characterized in that, The back glass (200) is provided with snap-fit ​​holes.

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