Photovoltaic junction box and photovoltaic module

Abstract

The utility model relates to the field of photovoltaic technology, in particular to a photovoltaic junction box and a photovoltaic assembly. The photovoltaic junction box comprises a shell, and the shell is installed on the back face of a photovoltaic panel. In the first direction, the shell is located at the edge of the photovoltaic panel; and along the second direction, the shell and the battery pieces in the photovoltaic panel are arranged in a staggered manner. Therefore, the photovoltaic junction box can prevent the battery piece from being shielded, the generating capacity of the back face of the photovoltaic panel is improved, and the generating efficiency of the photovoltaic module is improved. The bottom of the shell is provided with a step part composed of a first end face and a second end face, the first end face is connected with the back face of the photovoltaic panel in an adhesive mode, and the second end face is connected with a frame on the peripheral side of the photovoltaic panel in an adhesive mode. Therefore, the stability and the reliability of bonding of the photovoltaic junction box with the back surface of the photovoltaic panel and the frame can be improved, and the risk of loosening or falling of the photovoltaic junction box is reduced.

Description

Technical Field

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

[0002] Currently, in photovoltaic (PV) modules, junction boxes are typically installed on the back of the PV panel, with the junction box located in the middle of the panel. However, with the development of PV technology, the back of the PV panel can also generate electricity. This means that the junction box in the middle of the panel will block some of the solar cells, resulting in reduced power generation from the back of the panel, decreased PV module efficiency, and increased costs.

[0003] Therefore, there is an urgent need to design a photovoltaic junction box and photovoltaic module to solve the above technical problems. Utility Model Content

[0004] The primary objective of this invention is to provide a photovoltaic junction box that avoids obstructing the solar cells in a photovoltaic panel, thereby increasing the power generation on the back of the photovoltaic panel and ultimately improving the power generation efficiency of the photovoltaic module.

[0005] To achieve this objective, the present invention adopts the following technical solution:

[0006] This utility model provides a photovoltaic junction box, comprising:

[0007] A housing is mounted on the back of a photovoltaic panel; along a first direction, the housing is located at the edge of the photovoltaic panel; along a second direction, the housing is offset from the solar cells in the photovoltaic panel; the first direction and the second direction are perpendicular to each other.

[0008] The bottom of the housing has a stepped portion formed by a first end face and a second end face. The first end face is bonded to the back of the photovoltaic panel, and the second end face is bonded to the outer periphery of the photovoltaic panel.

[0009] As an optional technical solution for photovoltaic junction boxes, along the second direction, the height of the first end face is higher than the height of the second end face.

[0010] As an optional technical solution for a photovoltaic junction box, the photovoltaic junction box includes a conductive sheet disposed inside the housing, with one end of the conductive sheet used to connect to one end of a lead wire, and the other end of the lead wire connected to the solar cell.

[0011] As an optional technical solution for photovoltaic junction boxes, a solder block is provided at the connection between the conductive sheet and the lead wire, and the solder block is configured to solder the conductive sheet and the lead wire together.

[0012] As an optional technical solution for a photovoltaic junction box, the photovoltaic junction box also includes a cable and a photovoltaic connector, one end of the cable is crimped to the conductive sheet, and the other end of the cable is connected to the photovoltaic connector.

[0013] As an optional technical solution for a photovoltaic junction box, a first through hole is provided at the bottom of the housing, and one end of the lead wire passes through the first through hole and is connected to the conductive sheet.

[0014] As an optional technical solution for photovoltaic junction boxes, a second through hole is also provided on the side wall of the housing, and one end of the cable passes through the second through hole and is pressed against the conductive sheet.

[0015] As an optional technical solution for a photovoltaic junction box, the photovoltaic junction box further includes a cover, the housing having an opening, and the cover fastening onto the housing and sealing the opening.

[0016] The second objective of this invention is to provide a photovoltaic module with high power generation efficiency.

[0017] To achieve this objective, the present invention adopts the following technical solution:

[0018] This utility model provides a photovoltaic module, which includes a frame, a photovoltaic panel, lead wires, and a photovoltaic junction box as described in any of the above optional technical solutions. The frame is installed on the periphery of the photovoltaic panel. The photovoltaic panel includes a back sheet, a back film layer, a cell layer, a front film layer, and a front sheet, which are stacked in sequence. The photovoltaic junction box is located at the edge of the back sheet along the first direction. One end of the lead wire is connected to the cell layer, and the other end of the lead wire extends from one side of the photovoltaic panel into the photovoltaic junction box.

[0019] As an optional technical solution for photovoltaic modules, the lead-out lines are wrapped with an insulating layer.

[0020] The beneficial effects of this utility model include at least the following:

[0021] This invention provides a photovoltaic (PV) junction box, comprising a housing mounted on the back of a photovoltaic panel. Along a first direction, the housing is located at the edge of the photovoltaic panel; along a second direction, the housing is offset from the solar cells in the photovoltaic panel. This design prevents the junction box from obstructing the solar cells, thereby increasing the power generation on the back of the photovoltaic panel, improving the power generation efficiency of the photovoltaic module, and saving costs. The bottom of the housing has a stepped portion formed by a first end face and a second end face. The first end face is bonded to the back of the photovoltaic panel, and the second end face is bonded to the outer periphery of the photovoltaic panel. This improves the stability and reliability of the bonding between the junction box and the back of the photovoltaic panel and the frame, reducing the risk of the junction box loosening or falling off. Furthermore, compared to traditional technology (where the junction box is located in the middle of the photovoltaic panel), the junction box in this invention is located at the edge of the photovoltaic panel and connected to the frame. This not only avoids obstructing the solar cells and increases the power generation on the back of the photovoltaic panel, but also allows the heat generated by the junction box to be directly conducted through the frame, improving the heat dissipation efficiency of the junction box and thus enhancing safety.

[0022] This invention provides a photovoltaic module that improves the power generation efficiency of the photovoltaic module and achieves the goal of saving costs. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the content of the embodiments of this utility model and these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of the structure of the photovoltaic module provided in this embodiment of the utility model;

[0025] Figure 2 This is a cross-sectional view of the photovoltaic module provided in this embodiment of the utility model;

[0026] Figure 3 This is a schematic diagram of the structure of the photovoltaic panel and lead wires provided in this embodiment of the utility model;

[0027] Figure 4 This is a schematic diagram of the junction box provided in an embodiment of the present utility model.

[0028] Figure Labels

[0029] 10. Back panel; 20. Back adhesive film layer; 30. Battery cell layer; 40. Front adhesive film layer; 50. Front panel; 60. Frame; 70. Lead wire; 80. Insulation layer;

[0030] 100. Housing; 110. First end face; 120. Second end face; 130. First through hole; 140. Second through hole;

[0031] 200, conductive sheet; 300, solder block; 400, cable; 500, photovoltaic connector; 600, cover. Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0033] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0034] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0035] In the description of this utility model, it should be noted that the terms "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this utility model is in use. They are used only for the convenience of describing this utility model and for 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. Furthermore, the terms "first," "second," and "third," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0036] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set" and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0037] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0038] 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.

[0039] This embodiment provides a photovoltaic junction box that can avoid obstructing the solar cells in the photovoltaic panel, increase the power generation on the back of the photovoltaic panel, thereby improving the power generation efficiency of the photovoltaic module and achieving the goal of saving costs.

[0040] like Figures 1-4 As shown, the photovoltaic junction box mainly includes a housing 100, which is installed on the back of the photovoltaic panel. Along a first direction, the housing 100 is located at the edge of the photovoltaic panel; along a second direction, the housing 100 is offset from the solar cells in the photovoltaic panel. This allows the photovoltaic junction box to avoid obstructing the solar cells, thereby increasing the power generation on the back of the photovoltaic panel, thus improving the power generation efficiency of the photovoltaic module and saving costs. The first and second directions are perpendicular to each other. The first direction is... Figure 1 The X-axis direction in the diagram, the second direction is... Figure 1 The Z-axis direction in the diagram. In other words, the first direction is the direction of the long side of the photovoltaic panel, and the second direction is the thickness direction of the photovoltaic panel.

[0041] The bottom of the housing 100 has a stepped portion formed by a first end face 110 and a second end face 120. The first end face 110 is bonded to the back of the photovoltaic panel, and the second end face 120 is bonded to the outer periphery of the photovoltaic panel frame 60. This improves the stability and reliability of the bonding between the photovoltaic junction box and the back of the photovoltaic panel and the frame 60, reducing the risk of the photovoltaic junction box loosening or falling off. Furthermore, compared to conventional technology (where the junction box is located in the middle of the photovoltaic panel), the photovoltaic junction box in this embodiment is located at the edge of the photovoltaic panel and connected to the frame 60. This not only avoids obstructing the solar cells but also allows the heat generated by the photovoltaic junction box to be directly conducted through the frame 60, improving the heat dissipation efficiency of the photovoltaic junction box and thus enhancing safety.

[0042] For example, in this embodiment, the housing 100 is bonded to the photovoltaic panel and the frame 60 simultaneously using double-sided adhesive.

[0043] Since the bottom surface of the frame 60 will protrude from the back of the photovoltaic panel after the frame 60 is installed around the photovoltaic panel, in order to ensure that the housing 100 can fit well and be stably bonded to both the frame 60 and the photovoltaic panel, such as... Figure 2 As shown, in this embodiment, the height of the first end face 110 along the second direction is higher than the height of the second end face 120. This allows the housing 100 to adapt well to the height difference between the frame 60 and the back of the photovoltaic panel after installation, thereby improving the stability and reliability of the photovoltaic junction box bonding and increasing the bonding strength.

[0044] like Figure 2 and Figure 4 As shown, the photovoltaic junction box in this embodiment includes a conductive sheet 200, which is disposed within the housing 100. One end of the conductive sheet 200 is used to connect to one end of a lead wire 70, and the other end of the lead wire 70 is connected to a solar cell. For example, the conductive sheet 200 can be snapped into the inner wall of the housing 100 to improve its stability. The connection between the conductive sheet 200 and the lead wire 70 allows current to be discharged from the solar cell.

[0045] A first through hole 130 is provided at the bottom of the housing 100, and one end of the lead wire 70 passes through the first through hole 130 and connects to the conductive sheet 200. The first through hole 130 facilitates the lead wire 70 to pass through the housing 100 and connect to the conductive sheet 200 inside the housing 100.

[0046] Furthermore, in this embodiment, a solder block 300 is provided at the connection between the conductive sheet 200 and the lead wire 70. The solder block 300 is configured to solder the conductive sheet 200 and the lead wire 70 together. For example, during the soldering process, a solder block 300 can be formed at the connection between the conductive sheet 200 and the lead wire 70 by soldering, thereby improving the stability of the soldering connection between the conductive sheet 200 and the lead wire 70 and avoiding the phenomenon of cold solder joints.

[0047] Furthermore, the photovoltaic junction box also includes a cable 400 and a photovoltaic connector 500. One end of the cable 400 is crimped to the conductive sheet 200, and the other end of the cable 400 is connected to the photovoltaic connector 500. The current in the solar cell can be transmitted to the photovoltaic connector 500 through the conductive sheet 200 and the cable 400 in sequence. The photovoltaic connector 500 can be connected to electrical appliances or inverters to realize the utilization and conversion of current.

[0048] A second through hole 140 is also provided on the side wall of the housing 100, through which one end of the cable 400 passes and is crimped to the conductive sheet 200. The second through hole 140 can reduce bending at the connection between the cable 400 and the conductive sheet 200, and improve the reliability of the connection.

[0049] After the metal parts inside the housing 100 are welded, the housing 100 needs to be sealed with adhesive to improve the sealing performance of the photovoltaic junction box and reduce or avoid the corrosion of the metal parts by moisture.

[0050] like Figure 2 As shown, in this embodiment, the photovoltaic junction box also includes a cover 600. The housing 100 has an opening, and the cover 600 is fastened onto the housing 100 and seals the opening. The cover 600 and the housing 100 can be assembled by a snap-fit ​​connection, so that the cover 600 can protect the components in the housing 100.

[0051] like Figures 1-3 As shown, this embodiment also provides a photovoltaic module, which mainly includes a frame 60, a photovoltaic panel, a lead wire 70, and the aforementioned photovoltaic junction box. The frame 60 is installed on the periphery of the photovoltaic panel. The photovoltaic panel includes a back sheet 10, a back film layer 20, a cell layer 30, a front film layer 40, and a front sheet 50 stacked in sequence. The photovoltaic junction box is located at the edge of the back sheet 10 along a first direction. One end of the lead wire 70 is connected to the cell layer 30, and the other end of the lead wire 70 is led out from one side of the photovoltaic panel into the photovoltaic junction box. This eliminates the need to make holes in the back sheet 10, improves the mechanical strength of the back sheet 10, extends its service life, and improves the sealing performance of the photovoltaic module.

[0052] In this embodiment, when the cover 600 is fastened onto the housing 100 and the opening is sealed, the assembly of the photovoltaic junction box is completed. At this time, along... Figure 1 In the second direction (Z-axis direction), the height of the cover 600 is no higher than the height of the frame 60, thus achieving an ultra-thin design for the photovoltaic junction box. Similarly, this also minimizes the thickness of the frame 60 along the second direction, saving material and achieving an ultra-thin design for the frame 60. This not only reduces costs and weight, and lowers logistics and transportation expenses, but also saves space and increases the packing capacity of photovoltaic modules.

[0053] Two photovoltaic junction boxes are provided, and the two photovoltaic junction boxes are respectively disposed at the edges of the back panel 10 along the first direction. In other words, in this embodiment, the two photovoltaic junction boxes are disposed at the short side of the back panel 10 and are bonded to the frame 60. The cell layer 30 has multiple cells with a series-parallel design, and along the first direction, the cells at both ends of the cell layer 30 are at a preset distance from the edge of the front adhesive film. The photovoltaic junction boxes are installed within this preset distance to avoid the photovoltaic junction boxes obstructing the cells.

[0054] In this embodiment, the front panel 50 and the back panel 10 do not necessarily have to be made of glass; any material with protective function can be used. However, the front panel 50 must be a transparent material to allow light to pass through, while the back panel 10 is not limited to being a transparent material.

[0055] It should be noted that traditional photovoltaic modules are limited by the circuit design of the cell layer 30, requiring bypass diodes in the junction box to protect the cells. Specifically, when some cells are shaded, the operating voltage of the circuit in the cell layer 30 changes, causing the operating voltage across the bypass diode to switch between positive and negative, ultimately activating it. This short-circuits the cell string containing the shaded cell, resulting in a loss of power generation from that string and increasing the cost of the bypass diode design.

[0056] In this embodiment, the battery cell layer 30 includes multiple battery cells, which are connected in series to form multiple battery strings. The multiple battery strings are arranged side by side and connected in parallel by solder ribbons, thereby establishing a physical parallel and series battery cell structure and forming a multi-channel output form of current. This eliminates the need for bypass diodes in traditional junction boxes to protect the circuit, thus saving materials and reducing costs.

[0057] In this embodiment, the bypass diode is eliminated from the photovoltaic junction box, which not only reduces the cost of the photovoltaic junction box but also avoids the heat generation problem caused by leakage current in conventional diodes. Similarly, the elimination of the bypass diode also extends the lifespan of the photovoltaic junction box and avoids the risk of bypass diode failure in conventional photovoltaic modules. Furthermore, since multiple cell strings in this embodiment are arranged in parallel and connected in parallel by solder ribbons, a physical parallel-series cell structure is established, forming a cell layer with multi-channel output. This means that the cell layer only needs one input port and one output port. Consequently, the photovoltaic module only needs two photovoltaic junction boxes, eliminating the need for three independent junction boxes per photovoltaic module in traditional technologies, further reducing manufacturing costs and simplifying the photovoltaic module assembly process.

[0058] In this embodiment, the lead wire 70 extends from the short side of the photovoltaic panel to the photovoltaic junction box and is welded to the conductive sheet 200. The lead wire 70 is wrapped with an insulating layer 80, which not only prevents leakage and reduces safety hazards, but also enhances the protection of the lead wire 70.

[0059] For example, the insulating layer 80 in this embodiment can be made of materials such as polyvinyl chloride (PVC) and polyethylene (PE), which are low in cost and readily available.

[0060] Optionally, along a third direction, the width of the front panel 50 in this embodiment is 0.5mm-5mm wider than the width of the back panel 10. This prevents the photovoltaic panel from cutting the lead wire 70 during edge trimming, thus improving the protection of the lead wire 70. The third direction is... Figure 1 and Figure 2 The Y-axis direction in the diagram, in other words, the third direction is the direction in which the short side of the photovoltaic panel extends, and the third direction is perpendicular to both the first and second directions.

[0061] Obviously, the above description is merely a preferred embodiment of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments, and substitutions can be made without departing from the protection scope of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments. Many other equivalent embodiments may be included without departing from the concept of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

[0062] Note that in the description of this specification, the references to terms such as "some embodiments," "other embodiments," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this utility model. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

Claims

1. Photovoltaic junction box, characterized in that The photovoltaic junction box comprises a shell (100) mounted on the back of a photovoltaic panel, wherein the shell (100) is located at the edge of the photovoltaic panel along a first direction and is arranged away from the cell layer in the photovoltaic panel along a second direction, and the first direction and the second direction are perpendicular to each other; the bottom of the shell (100) has a stepped portion composed of a first end face (110) and a second end face (120), the first end face (110) is adhesively connected with the back of the photovoltaic panel, and the second end face (120) is adhesively connected with the frame (60) on the outer circumferential side of the photovoltaic panel. The height of the first end face (110) is higher than that of the second end face (120) along the second direction. The photovoltaic junction box comprises a conductive sheet (200) arranged in the shell (100), one end of the conductive sheet (200) is used for being connected with one end of an outgoing wire (70), and the other end of the outgoing wire (70) is connected with the cell layer. A solder block (300) is arranged at the connection between the conductive sheet (200) and the outgoing wire (70), and the solder block (300) is configured to weld the conductive sheet (200) and the outgoing wire (70).

2. The photovoltaic junction box of claim 1, wherein, The photovoltaic junction box further comprises a cable (400) and a photovoltaic connector (500), one end of the cable (400) is crimped with the conductive sheet (200), and the other end of the cable (400) is connected with the photovoltaic connector (500).

3. The photovoltaic junction box of claim 1, wherein, A first through hole (130) is formed in the bottom of the shell (100), and one end of the outgoing wire (70) passes through the first through hole (130) to be connected with the conductive sheet (200).

4. The photovoltaic junction box of claim 3, wherein, A second through hole (140) is further arranged on the sidewall of the shell (100), and one end of the cable (400) passes through the second through hole (140) to be crimped with the conductive sheet (200).

5. The photovoltaic junction box of claim 3, wherein, The photovoltaic junction box further comprises a cover (600), the shell (100) has an opening, and the cover (600) is buckled on the shell (100) to block the opening.

6. The photovoltaic junction box of claim 3, wherein, The photovoltaic assembly comprises a frame (60), a photovoltaic panel, an outgoing wire (70) and the photovoltaic junction box according to any one of claims 1-8, the frame (60) is mounted on the circumferential side of the photovoltaic panel, the photovoltaic panel comprises a back panel (10), a back adhesive film layer (20), a cell layer (30), a front adhesive film layer (40) and a front panel (50) arranged in sequence, wherein the photovoltaic junction box is arranged at the edge of the back panel (10) along the first direction, one end of the outgoing wire (70) is connected with the cell layer (30), and the other end of the outgoing wire (70) is led out from one side of the photovoltaic panel to the photovoltaic junction box.

7. The photovoltaic junction box of claim 5, wherein, An insulating layer (80) is wrapped on the outgoing wire (70).

8. The photovoltaic junction box of claim 1, wherein, ​ 9. A photovoltaic module characterized by, ​ 10. The photovoltaic module of claim 9, wherein, ​

Images