Photovoltaic junction box, photovoltaic module and photovoltaic system

Abstract

The utility model provides a photovoltaic junction box, a photovoltaic module and a photovoltaic system. The photovoltaic junction box is configured to be electrically connected with a photovoltaic panel. The photovoltaic junction box comprises a box body; the conductive piece is arranged in the box body, and the conductive piece comprises a first wiring part and a testing part which are independent from each other; the first wiring part is configured to be connected with a bus bar of the photovoltaic panel; and the testing part is configured to test the photovoltaic panel. When the photovoltaic junction box is used for testing a photovoltaic panel, the risk of missed testing is reduced.

Description

Technical Field

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

[0002] A photovoltaic (PV) module consists of a photovoltaic panel and a junction box. The junction box connects the PV panel and connects the electricity generated by the PV panel to external wiring, conducting the current generated by the PV panel. Currently, PV panels of PV modules typically undergo EL (Electroluminescence) testing, IV testing (cell current-voltage characteristic curve testing), and insulation withstand voltage testing. However, existing junction boxes have the problem of missing some tests. Utility Model Content

[0003] This application provides a photovoltaic junction box, photovoltaic module, and photovoltaic system, which aims to reduce the risk of missed tests when testing photovoltaic panels.

[0004] To solve the above-mentioned technical problems, one technical solution adopted in this application is: to provide a photovoltaic junction box configured to be electrically connected to a photovoltaic panel, the photovoltaic junction box comprising: a box body; a conductive element disposed within the box body, and the conductive element comprising a first wiring portion and a test portion that are independent of each other; the first wiring portion being configured to be connected to the busbar of the photovoltaic panel; and the test portion being configured to test the photovoltaic panel.

[0005] The aforementioned photovoltaic junction box, by including independent first wiring sections and testing sections in its conductive components, allows for electrical connection between the junction box and the photovoltaic panel even when the first wiring sections and testing sections are separated. The first wiring section connects to the busbar of the photovoltaic panel, enabling electrical connection between the junction box and the photovoltaic panel. The testing section then performs tests on the photovoltaic panel. This minimizes the impact of protrusions or burrs caused by welding the first wiring section to the busbar on the contact between the test terminals and the testing section during photovoltaic panel testing. This increases the probability of effective electrical connection between the positive and negative test terminals and the corresponding conductive components, reducing the risk of missed tests. The test terminals can efficiently and accurately perform various tests on the laminated photovoltaic panel via the testing section.

[0006] In one embodiment, the conductive element is in the form of a sheet.

[0007] The above-described solution, using sheet-like conductive components, allows for a lighter overall weight of the conductive component while increasing its surface area, facilitating production of thinner and lighter designs. Furthermore, the sheet-like conductive component has minimal impact on the layout of other structures within the photovoltaic junction box along its height.

[0008] In one embodiment, the housing includes a bottom wall with a through hole; the through hole is configured to allow the busbar to pass through; the conductive element has a clearance hole corresponding to the through hole; the busbar passes through the through hole and the clearance hole in sequence and is connected to the first wiring portion of the conductive element on the side surface opposite to the bottom wall.

[0009] The above solution allows the busbar to be directly electrically connected to the first wiring section through the clearance hole, which can shorten the distribution path of the busbar and save busbars; moreover, it can reduce the impact of changes in the area of ​​the conductive component on the connection between the busbar and the conductive component.

[0010] In one embodiment, along the circumferential direction of the clearance hole, a portion of the conductive element serves as the first wiring portion, and a portion of the conductive element serves as the test portion.

[0011] The above-described solution maximizes the area of ​​the first wiring section, thereby improving the reliability of the connection between the first wiring section and the busbar. It also maximizes the area of ​​the test section, increasing the contact range between the test terminal and the conductive element, thus increasing the probability of effective electrical connection between the test terminal and the conductive element, and reducing the alignment accuracy requirements between the test terminal and the test section. Furthermore, a larger test section reduces the risk of inaccurate test results or the test terminal failing to make effective electrical connection with the corresponding conductive element, thus preventing open circuits.

[0012] In one embodiment, the conductive element further includes a second wiring portion connected to the side of the first wiring portion away from the clearance hole, extending in the direction of the first wiring portion away from the clearance hole, and configured to be electrically connected to a cable.

[0013] The above solution not only enables effective electrical connection between the conductive component and the cable, but also reduces the impact on other structures arranged along the height of the box by placing the first wiring section, the second wiring section and the test section on the same plane.

[0014] In one embodiment, the first wiring portion has a groove on the side surface opposite to the bottom wall of the housing, the groove being configured to be electrically connected to the busbar; and / or the first wiring portion is integrally formed with the test portion.

[0015] The above-described solution, by setting a groove, reduces the overall thickness of the connection point between the busbar and the first terminal after they are connected, thereby reducing the impact of welding protrusions or burrs on the testing process and / or the assembly process of the photovoltaic junction box. Furthermore, by integrally molding the first terminal and the testing section, the connection strength between the two can be improved, thus increasing the accuracy of the test results; moreover, it can be fabricated using the same conductive plate, resulting in a simple manufacturing process and low cost.

[0016] In one embodiment, the housing has a bottom surface configured to face the photovoltaic panel; wherein the bottom surface has a first receiving groove configured to receive a barrier plate configured to block the photovoltaic panel.

[0017] The above-described solution reduces the risk of relative displacement between the barrier plate and the photovoltaic panel, which could prevent the barrier plate from effectively sealing the photovoltaic panel. This improves the photovoltaic panel's resistance to oxygen corrosion and enhances its long-term stability and reliability. Simultaneously, it reduces the overall thickness of the photovoltaic junction box, photovoltaic panel, and barrier plate, decreasing the gap between the photovoltaic panel and the junction box, further improving the photovoltaic panel's resistance to oxygen corrosion.

[0018] In one embodiment, the bottom surface further has a second receiving groove; the photovoltaic junction box further includes an adhesive element disposed in the second receiving groove and configured to be bonded and fixed to the photovoltaic panel.

[0019] In the above solution, during the process of connecting and fixing the photovoltaic junction box to the photovoltaic panel, the photovoltaic junction box and the photovoltaic panel can be bonded together with adhesive to achieve a pre-fixation effect. This reduces the possibility of relative displacement between the photovoltaic junction box and the photovoltaic panel during the bonding process with other adhesive liquids, which could lead to the barrier plate failing to effectively seal the photovoltaic panel.

[0020] In one embodiment, the first dimension of the box body along the first direction is greater than the second dimension of the box body along the second direction; the first direction is perpendicular to the second direction; wherein, there are two second receiving slots, and the two second receiving slots are respectively located on both sides of the first receiving slot along the first direction; the second receiving slots extend along the second direction, and each second receiving slot contains one of the adhesive members.

[0021] The above solution can improve the connection reliability between the photovoltaic junction box and the photovoltaic panel, reduce the risk of relative displacement between the photovoltaic junction box and the photovoltaic panel, thereby reducing the risk of relative displacement between the barrier plate and the photovoltaic panel, and improving the long-term stability and reliability of the photovoltaic panel.

[0022] To solve the above-mentioned technical problems, another technical solution adopted in this application is to provide a photovoltaic module, which includes: a photovoltaic panel; and the photovoltaic junction box mentioned above, which is disposed on the photovoltaic panel and electrically connected to the photovoltaic panel.

[0023] The above solution reduces the risk of missed tests by setting up the first wiring section and the testing section independently, and can efficiently and accurately perform various tests on photovoltaic panels after lamination.

[0024] In one embodiment, the photovoltaic panel includes a busbar and an outlet; the busbar extends out of the photovoltaic panel through the outlet; the photovoltaic module further includes a barrier plate, which is sandwiched between the photovoltaic panel and the photovoltaic junction box, blocks the outlet, and is located in a second receiving slot of the photovoltaic junction box.

[0025] The above solution can effectively reduce the risk of yellowing and decomposition of the batteries at the outlet holes by preventing water and oxygen from entering the photovoltaic panel through the barrier plate.

[0026] To solve the above-mentioned technical problems, another technical solution adopted in this application is to provide a photovoltaic system, which includes the photovoltaic modules mentioned above.

[0027] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application 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 application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0028] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiments below. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0029] Figure 1 This is a schematic diagram of the structure of a box provided in an embodiment of this application from a first-view perspective;

[0030] Figure 2 A schematic diagram of the structure of the box provided in an embodiment of this application from a second perspective;

[0031] Figure 3 This is a schematic diagram of a conductive element disposed within a housing according to an embodiment of this application.

[0032] Figure 4 for Figure 3 A schematic diagram showing the connection between the structure shown and the busbar;

[0033] Figure 5 This is a schematic diagram of the structure of a conductive element provided in an embodiment of this application;

[0034] Figure 6 This is a schematic diagram of the structure of an adhesive component provided on the bottom surface of a box according to an embodiment of this application.

[0035] Explanation of reference numerals in the attached figures

[0036] 10. Housing; 11. Cable hole; 12. Through hole; 13. First receiving groove; 14. Second receiving groove; 15. Fixing component;

[0037] 20 Conductive component; 21 First wiring part; 22 Test part; 23 Clearance hole; 24 Second wiring part; 25 Groove; 2a Positive conductive component; 2b Negative conductive component;

[0038] 30 Busbars; 40 Cables; 50 Adhesives. Detailed Implementation

[0039] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0040] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0041] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0042] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0043] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0044] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0045] In the description of the embodiments of this application, the technical terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and are not intended to 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 the embodiments of this application.

[0046] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0047] A photovoltaic (PV) power generation system is a device that converts solar energy into electrical energy. A PV system includes photovoltaic panels and a junction box. The junction box typically includes positive and negative conductive components. The positive busbar of the PV panel is electrically connected to the positive conductive component by welding, and the negative busbar of the PV panel is electrically connected to the negative conductive component by welding, thus achieving electrical connection between the PV panel and the junction box. The positive and negative conductive components are also configured to be electrically connected to transmission cables to transmit the electrical energy generated by the PV panel externally, such as to inverters, controllers, or other power systems.

[0048] However, when using welding, protrusions or burrs may appear at the welding points between the busbar and the conductive components, resulting in a height discrepancy between the welding points of the positive and negative conductive components. This means the welding points are at different heights relative to the photovoltaic panel, creating a height difference. Consequently, when the positive and negative test terminals are brought into contact with their respective welding points for testing, the height difference may prevent one of the test terminals from making contact, creating an open circuit and preventing effective testing of the photovoltaic panel—a missed test result. Furthermore, the photovoltaic junction box relies solely on edge adhesive and potting compound to isolate water and oxygen from the photovoltaic panel, offering poor insulation performance. For perovskite solar cells, which are sensitive to water and oxygen, this is detrimental to their long-term stability.

[0049] Therefore, this application provides a photovoltaic junction box that can reduce the risk of missed tests during the testing process.

[0050] The present application will now be described in detail with reference to the accompanying drawings and embodiments.

[0051] Please see Figures 1 to 5 , Figure 1 This is a schematic diagram of the structure of a box provided in an embodiment of this application from a first-view perspective; Figure 2 A schematic diagram of the structure of the box provided in an embodiment of this application from a second perspective; Figure 3 This is a schematic diagram of a conductive element disposed within a housing according to an embodiment of this application. Figure 4 for Figure 3 A schematic diagram showing the connection between the structure shown and the busbar; Figure 5 This is a schematic diagram of the structure of a conductive component provided in one embodiment of this application. In this embodiment, a photovoltaic junction box is provided, which is configured to be electrically connected to a photovoltaic panel. The photovoltaic junction box includes a housing 10 and a conductive component 20. The conductive component 20 is disposed within the housing 10, and the conductive component 20 includes a first wiring portion 21 and a testing portion 22 that are independent of each other; the first wiring portion 21 is configured to be connected to the busbar 30 of the photovoltaic panel; the testing portion 22 is configured to test the photovoltaic panel.

[0052] Among them, combined Figure 2 and Figure 3 The housing 10 has cable holes 11 at its left and right ends along the first direction X, for the cable 40 to pass through. The cable 40 passes through the cable holes 11 and is electrically connected to the conductive element 20 to transmit the electrical energy generated by the photovoltaic panel to the outside. The housing 10 has a receiving cavity, and the conductive element 20 is disposed in the receiving cavity of the housing 10.

[0053] The independent first wiring section 21 and test section 22 refer to the fact that the first wiring section 21 and test section 22 do not overlap. The first wiring section 21 and test section 22 can each be a portion of the conductive element 20. The test section 22 is configured to make electrical contact with the test terminal to perform EL testing, IV testing, insulation withstand voltage testing, and other tests on the photovoltaic panel.

[0054] Combination Figure 3 The photovoltaic junction box specifically includes two conductive components 20, namely a positive conductive component 2a and a negative conductive component 2b, which are located on opposite sides of the box body 10 along the first direction X. The positive conductive component 2a is configured to be electrically connected to the positive busbar of the photovoltaic panel, and the negative conductive component 2b is configured to be electrically connected to the negative busbar of the photovoltaic panel.

[0055] When the two conductive elements 20 are disposed within the housing 10, the test portion 22 of the positive conductive element 2a and the test portion 22 of the negative conductive element 2b are on the same plane. Furthermore, the first wiring portion 21 of the positive conductive element 2a and the first wiring portion 21 of the negative conductive element 2b can also be on the same plane. This facilitates maintaining the test portions 22 of the two conductive elements 20 at the same horizontal level at all times, reduces the risk of a height difference between the test portions 22 of the two conductive elements 20, and facilitates effective contact and electrical connection between the test terminals and the test portions 22 of the two conductive elements 20 to complete the test.

[0056] The positive electrode conductive element 2a and the negative electrode conductive element 2b have the same or similar structures. In some specific embodiments, the first wiring portion 21 of the positive electrode conductive element 2a is located along the first direction X on the side of the test portion 22 of the positive electrode conductive element 2a away from the test portion 22 of the negative electrode conductive element 2b; the first wiring portion 21 of the negative electrode conductive element 2b is located along the first direction X on the side of the test portion 22 of the negative electrode conductive element 2b away from the test portion 22 of the positive electrode conductive element 2a. In some embodiments, the positive electrode conductive element 2a and the negative electrode conductive element 2b are axially symmetrical along the second direction Y. The first direction X is perpendicular to the second direction Y.

[0057] A photovoltaic panel consists of multiple solar cells, which are typically connected in series and / or in parallel to form a two-port structure. The power from the two ports is drawn out through two busbars 30, serving as the positive and negative terminals of the photovoltaic panel, respectively.

[0058] Busbar 30 (also known as a bus strip) is a conductive component specifically designed to collect the current generated by solar cells. Busbar 30 passes through the junction box and is connected to the first terminal 21 in the photovoltaic junction box. In a solar photovoltaic module, each cell is connected to busbar 30 via a conductive material such as solder ribbon, thus collecting the direct current output from each cell to form a higher total current. Busbar 30 and the first terminal 21 can be soldered together to achieve electrical connection between them.

[0059] The photovoltaic junction box provided in this embodiment includes an independent first wiring portion 21 and a test portion 22 in the conductive component 20. Even if the first wiring portion 21 and the test portion 22 are separately arranged, they can be connected to the busbar 30 of the photovoltaic panel through the first wiring portion 21 to achieve electrical connection between the photovoltaic junction box and the photovoltaic panel; the photovoltaic panel is tested through the test portion 22. In this way, during the testing of the photovoltaic panel, the protrusions or burrs caused by welding the first wiring portion 21 and the busbar 30 have a smaller impact on the contact between the test terminals and the test portion 22, which increases the probability of effective electrical connection between the positive and negative test terminals and the corresponding conductive component 20 and reduces the risk of missed tests; the test terminals can efficiently and accurately perform various tests on the photovoltaic panel after lamination through the test portion 22.

[0060] In one embodiment, combined Figure 5 The conductive element 20 is in the form of a sheet.

[0061] The sheet-shaped conductive element 20 has a two-dimensional planar structure, rather than a three-dimensional structure. The conductive element 20 can be a conductive sheet formed by processing a conductive metal sheet.

[0062] In this embodiment, compared to a block-shaped conductive component, the sheet-like conductive component 20 allows for a lighter overall weight of the conductive component 20 while increasing its area, facilitating production of thinner and lighter designs. Furthermore, the sheet-like conductive component 20 has minimal impact on the layout of other structures within the photovoltaic junction box in the height direction Z.

[0063] In one embodiment, combined Figure 2 and Figure 3 The box body 10 includes a bottom wall with a through hole 12. The through hole 12 is configured to allow the busbar 30 to pass through. The conductive element 20 has a clearance hole 23, which is provided corresponding to the through hole 12. The busbar 30 passes through the through hole 12 and the clearance hole 23 in sequence and is connected to the first wiring portion 21 of the conductive element 20 on the side surface away from the bottom wall.

[0064] The housing 10 has a bottom wall and side walls, which together form a receiving cavity. The bottom wall of the housing 10 faces the photovoltaic panel. At least two through holes 12 are formed on the bottom wall, through which positive and negative busbars 30 extend into the receiving cavity and are electrically connected to two conductive elements 20. The circumferential edges of the conductive elements 20 are fixedly connected to the bottom wall of the housing 10 by screws or studs or other fasteners 15. In one specific embodiment, the conductive elements 20 are fixed to the bottom wall of the housing 10 around the four corners of the clearance hole 23 by fasteners 15.

[0065] The clearance hole 23 penetrates the bottom wall of the box 10 and can be coaxially arranged with the through hole 12. The cross-sectional area of ​​the clearance hole 23 can be slightly smaller than that of the through hole 12. Of course, the cross-sectional area of ​​the clearance hole 23 can also be equal to that of the through hole 12; or the cross-sectional area of ​​the clearance hole 23 can also be larger than that of the through hole 12.

[0066] Combination Figure 4 After the busbar 30 passes through the through hole 12 and the clearance hole 23 along the height direction Z of the housing 10, a portion of the busbar 30 is bent to the side surface of the first wiring part 21 away from the bottom wall of the housing 10, so as to be electrically connected to the first wiring part 21.

[0067] In this embodiment, the busbar 30 can be directly and effectively electrically connected to the first wiring portion 21 through the clearance hole 23. At the same time, compared with the scheme in which the busbar 30 is wound around the edge of the conductive member 20 toward the bottom wall of the housing 10 to the side of the first wiring portion 21 away from the bottom wall of the housing 10, the distribution path of the busbar 30 can be shortened, saving the busbar 30. Moreover, the impact of the change in the area of ​​the conductive member 20 on the connection between the busbar 30 and the conductive member 20 can be reduced.

[0068] In one embodiment, combined Figure 5 Along the circumferential direction of the clearance hole 23, a portion of the conductive element 20 serves as the first wiring portion 21, and a portion of the conductive element 20 serves as the testing portion 22.

[0069] In other words, the conductive element 20 includes a first wiring portion 21 and a test portion 22 along the circumferential direction of the clearance hole 23. The busbar 30 is connected to the portion of the conductive element 20 along the circumferential direction of the clearance hole 23. When testing the photovoltaic panel, the test terminal can contact other parts of the conductive element 20 that are different from the first wiring portion 21 to complete the test. In a specific embodiment, the first wiring portion 21 and the test portion 22 may not be actually divided, wherein the portion of the conductive element 20 connected to the busbar 30 is called the first wiring portion 21; the portion of the conductive element 20 configured to contact the test terminal is called the test portion 22.

[0070] Given a fixed area corresponding to the outer contour of the conductive element 20, compared to a solution where the first wiring portion 21 and the test portion 22 are positioned on the same side of the clearance hole 23 along its radial direction, the solution described in this embodiment can maximize the area of ​​the first wiring portion 21 to improve the connection reliability between the first wiring portion 21 and the busbar 30. It can also maximize the area of ​​the test portion 22 to increase the contact range between the test terminal and the conductive element 20, increasing the probability of effective electrical connection between the test terminal and the conductive element 20, and reducing the alignment accuracy requirements between the test terminal and the test portion 22. Furthermore, a larger test portion 22 reduces the risk of inaccurate test results or the test terminal failing to effectively connect with the corresponding conductive element 20, thus preventing an open circuit.

[0071] In one embodiment, combined Figure 5 The conductive component 20 also includes a second wiring portion 24, which is connected to the side of the first wiring portion 21 away from the clearance hole 23 and extends in the direction of the first wiring portion 21 away from the clearance hole 23; the second wiring portion 24 is configured to be electrically connected to the cable 40.

[0072] The second connector 24 can be configured to be soldered to the cable 40 to achieve an electrical connection between them. The second connector 24 is also sheet-like and protrudes from the first connector 21 and the test section 22. The plane containing the second connector 24 can be parallel to the plane containing the first connector 21. In one embodiment, the second connector 24 can be on the same plane as the first connector 21 and the test section 22. Alternatively, there can be a certain height difference between the plane containing the second connector 24 and the planes containing the first connector 21 and the second connector 24. This height difference can be less than or slightly greater than the thickness of the conductive element 20.

[0073] The thickness of the second wiring portion 24 can be the same as that of the first wiring portion 21 and the test portion 22. The ratio of the cross-sectional area of ​​the second wiring portion 24 to the sum of the cross-sectional areas of the first wiring portion 21 and the test portion 22 can be less than 0.1. Hereinafter, the cross-sectional area referred to in this application refers to the area of ​​the region enclosed by the outer contour of the corresponding structure.

[0074] In this embodiment, the conductive element 20 can be effectively electrically connected to the cable 40, and by making the first wiring portion 21, the second wiring portion 24 and the test portion 22 substantially in the same plane, the impact on other structures arranged in the height direction Z of the housing 10 can be reduced.

[0075] In one embodiment, combined Figure 5The first wiring portion 21 has a groove 25 on the side surface opposite to the bottom wall of the housing 10, and the groove 25 is configured to be electrically connected to the busbar 30; and / or the first wiring portion 21 is integrally formed with the test portion 22.

[0076] The groove 25 is a blind groove, and the busbar 30 extends into the photovoltaic junction box and bends to the side of the groove 25 away from the bottom wall of the box body 10. The second wiring part 24 is specifically arranged adjacent to the groove 25 and is located on the first side of the groove 25 away from the avoidance hole 23. The wiring part and the test part 22 can be made from the same conductive plate. In one specific embodiment, the first wiring part 21, the second wiring part 24 and the test part 22 are all integrally formed.

[0077] In this embodiment, by providing the groove 25, the overall thickness of the connection between the busbar 30 and the first wiring portion 21 can be reduced after the busbar 30 is connected to the first wiring portion 21. This reduces the impact of welding protrusions or burrs on the testing process and / or the assembly process of the photovoltaic junction box. Furthermore, by integrally molding the first wiring portion 21 and the testing portion 22, the connection strength between the two can be improved, thereby increasing the accuracy of the test results. Moreover, they can be fabricated using the same conductive plate, resulting in a simple manufacturing process and low cost.

[0078] In one embodiment, please refer back to the previous section. Figure 2 The box 10 has a bottom surface that is configured to face the photovoltaic panel; wherein the bottom surface has a first receiving groove 13, the first receiving groove 13 is configured to receive a barrier plate (not shown), and the barrier plate is configured to block the photovoltaic panel.

[0079] The bottom surface of the housing 10 refers to the side of the bottom wall of the housing 10 that is configured to face the photovoltaic panel. The first receiving groove 13 is recessed in the direction away from the photovoltaic panel, and the depth of the first receiving groove 13 is less than or equal to the thickness of the barrier plate. The area of ​​the first receiving groove 13 may be slightly larger than the area of ​​the barrier plate, so that the barrier plate can be smoothly embedded in the first receiving groove 13.

[0080] A barrier plate is installed on the photovoltaic panel and configured to at least cover the outlet of the photovoltaic panel to provide insulation, sealing, and protection against water and oxygen, thereby protecting the solar cells inside the photovoltaic panel. The positive or negative electrode of the photovoltaic panel can be led out through the outlet. The barrier plate can be a photovoltaic glass sheet, specifically tempered glass. After the photovoltaic junction box is connected to the photovoltaic panel, the side of the barrier plate facing away from the photovoltaic panel abuts against the bottom wall of the first receiving groove 13, so that the bottom wall of the first receiving groove 13 and the photovoltaic panel tightly clamp the barrier plate, improving the water and oxygen resistance of the photovoltaic panel and its long-term stability and reliability.

[0081] In this embodiment, by providing a first receiving groove 13 on the photovoltaic junction box to accommodate the barrier plate used to seal the outlet, the risk of relative displacement between the barrier plate and the photovoltaic panel, which could prevent the barrier plate from effectively sealing the photovoltaic panel, can be reduced. This also reduces the risk of water and oxygen entering the interior of the photovoltaic panel and the risk of battery yellowing and decomposition at the outlet of the photovoltaic panel, thereby improving the long-term stability and reliability of the photovoltaic panel. Simultaneously, it can reduce the overall thickness of the photovoltaic junction box, photovoltaic panel, and barrier plate, as well as the gap between the photovoltaic panel and the photovoltaic junction box, further improving the photovoltaic panel's resistance to water and oxygen erosion.

[0082] In one embodiment, combined Figure 2 and Figure 6 , Figure 6 This is a schematic diagram of the structure of an adhesive element 50 provided on the bottom surface of the box body 10 according to an embodiment of this application. The bottom surface also has a second receiving groove 14; the photovoltaic junction box also includes an adhesive element 50, which is disposed in the second receiving groove 14 and configured to be bonded and fixed to the photovoltaic panel.

[0083] The second receiving groove 14 is recessed in the direction away from the photovoltaic panel. The adhesive component 50 can be a structure with adhesive on both sides, and one surface of the adhesive component 50 can be adhered to the bottom wall of the second receiving groove 14. The other surface of the adhesive component 50 can be provided with a protective film. During the connection process between the photovoltaic junction box and the photovoltaic panel, the protective film can be removed to expose the other surface of the adhesive component 50, so that it can be adhered to the photovoltaic panel through the adhesive surface, thereby achieving pre-fixation of the photovoltaic junction box and the junction box. The protective film can be a release film. The adhesive component 50 can be foam tape.

[0084] The cross-sectional area of ​​the adhesive element 50 can be equal to the cross-sectional area of ​​the second receiving groove 14, and the shape and size of the adhesive element 50 can be the same as the shape and size of the second receiving groove 14. Alternatively, the cross-sectional area of ​​the adhesive element 50 can be slightly smaller than the cross-sectional area of ​​the second receiving groove 14.

[0085] In this embodiment, during the process of connecting and fixing the photovoltaic junction box to the photovoltaic panel, the photovoltaic junction box and the photovoltaic panel can be bonded together first by the adhesive 50 to play a pre-fixing role, thereby reducing the possibility of relative displacement between the photovoltaic junction box and the photovoltaic panel during the bonding process with other adhesive liquids, which could lead to the barrier plate failing to effectively seal the photovoltaic panel.

[0086] In one embodiment, combined Figure 2 The first dimension of the box body 10 along the first direction X is greater than the second dimension of the box body 10 along the second direction Y; wherein, there are two second receiving slots 14, and the two second receiving slots 14 are respectively located on both sides of the first receiving slot 13 along the first direction X; the second receiving slots 14 extend along the second direction Y, and each second receiving slot 14 is provided with an adhesive 50.

[0087] In other words, the box body 10 is an elongated box extending along the first direction X, and two conductive elements 20 are spaced apart along the first direction X and located between two cable holes 11, with one conductive element 20 corresponding to one cable hole 11. Figure 3 The second wiring portion 24 of the conductive component 20 is positioned facing the corresponding cable hole 11. The cable 40 extends into the photovoltaic junction box through the cable hole 11 and is electrically connected to the second wiring portion 24 of the corresponding conductive component 20.

[0088] The first receiving slot 13 is located at the center of the box 10 along the first direction X. The second receiving slot 14 may be rectangular. The specific size of the first receiving slot 13 can be set according to the size of the barrier plate.

[0089] In this embodiment, by extending the second receiving groove 14 along the second direction Y, the area of ​​the adhesive 50 disposed in the second receiving groove 14 can be increased; at the same time, by disposing of an adhesive 50 on each side of the box body 10 along the first direction X, the reliability of the connection between the photovoltaic junction box and the photovoltaic panel through the adhesive 50 can be improved, the risk of relative displacement between the photovoltaic junction box and the photovoltaic panel can be reduced, thereby reducing the risk of relative displacement between the barrier plate and the photovoltaic panel, and improving the long-term stability and reliability of the photovoltaic panel.

[0090] In one embodiment, a photovoltaic module is provided that can convert solar energy into electrical energy, or store it in a battery, or power a load. The photovoltaic module includes a photovoltaic panel and a photovoltaic junction box as described in any of the above embodiments; the photovoltaic junction box is disposed on the photovoltaic panel and electrically connected to the photovoltaic panel.

[0091] The photovoltaic junction box is located on the back of the photovoltaic panel. The junction box protects the entire photovoltaic module's power generation system; it acts as a current relay station. When a cell's output wire short-circuits, the photovoltaic junction box automatically disconnects the short-circuited cell string. The photovoltaic panel can be a solar panel. The photovoltaic panel includes multiple solar cells, which are electrically connected to the conductive components 20 inside the photovoltaic junction box via busbars 30.

[0092] In this embodiment, by including an independent first wiring portion 21 and a test portion 22 in the conductive component 20, even if the first wiring portion 21 and the test portion 22 are separately arranged, they can be connected to the busbar 30 of the photovoltaic panel through the first wiring portion 21 to achieve electrical connection between the photovoltaic junction box and the photovoltaic panel; the photovoltaic panel is tested through the test portion 22. In this way, during the testing of the photovoltaic panel, the protrusions or burrs caused by welding the first wiring portion 21 and the busbar 30 have a smaller impact on the contact between the test terminals and the test portion 22, which increases the probability of effective electrical connection between the positive and negative test terminals and the corresponding conductive component 20, and reduces the risk of missed tests; the test terminals can efficiently and accurately perform various tests on the photovoltaic panel after lamination through the test portion 22.

[0093] In one embodiment, the photovoltaic panel includes a busbar 30 and an outlet; the busbar 30 is electrically connected to the solar cells in the photovoltaic panel through the outlet; the photovoltaic module also includes a barrier plate, which is sandwiched between the photovoltaic panel and the photovoltaic junction box, blocks the outlet, and is located in the second receiving slot 14 of the photovoltaic junction box.

[0094] One end of the busbar 30 is electrically connected to the solar cell inside the photovoltaic panel through the outlet, and the other end of the busbar 30 passes through the through hole 12 on the bottom wall of the photovoltaic junction box and the clearance hole 23 on the conductive component 20 and is electrically connected to the first wiring part 21. There are two busbars 30, one for the positive electrode and one for the negative electrode. The positive busbar is electrically connected to the positive electrode of the solar cell, and the negative busbar is electrically connected to the negative electrode of the solar cell.

[0095] The term "barrier plate clamped between photovoltaic panel and photovoltaic junction box" specifically refers to a barrier plate placed on the photovoltaic panel, covering all the outlets of the photovoltaic panel, with the side of the barrier plate facing away from the photovoltaic panel abutting against the bottom wall of the first receiving groove 13. This allows the barrier plate to be tightly clamped between the bottom wall of the first receiving groove 13 and the photovoltaic panel, thereby improving the waterproof and oxygen-resistant performance of the photovoltaic panel and enhancing its long-term stability and reliability.

[0096] In this embodiment, a barrier plate can be used to prevent water and oxygen from entering the interior of the photovoltaic panel, thereby reducing the risk of water and oxygen entering the interior of the photovoltaic panel and the yellowing and decomposition of the batteries at the outlet of the photovoltaic panel, and thus improving the long-term stability and reliability of the photovoltaic panel.

[0097] In one embodiment, a photovoltaic system is also provided, which includes the photovoltaic module provided in any of the above embodiments. The photovoltaic system utilizes the photovoltaic effect of the solar cells in the photovoltaic module to directly convert solar radiation energy into electrical energy with high efficiency; furthermore, the photovoltaic system can be a photovoltaic power generation system.

[0098] Photovoltaic modules are the core component of a photovoltaic power generation system. The aforementioned photovoltaic system includes one or more photovoltaic modules, which can be selected according to specific application scenarios. Furthermore, when the aforementioned photovoltaic system includes multiple photovoltaic modules, the multiple photovoltaic modules form a photovoltaic array.

[0099] The aforementioned photovoltaic system can be a stand-alone photovoltaic power generation system or a grid-connected photovoltaic power generation system. A stand-alone photovoltaic power generation system includes a photovoltaic array, battery bank, charge controller, power electronic converter (inverter), and loads. Its working principle is that solar radiation energy is first converted into electrical energy by the photovoltaic array, then converted by the power electronic converter to supply power to the load. Simultaneously, excess electrical energy is stored as chemical energy in an energy storage device after passing through the charge controller. Thus, when sunlight is insufficient, the energy stored in the battery can be converted into 220V, 50Hz AC power by the power electronic inverter, filter, and power frequency transformer to supply AC loads.

[0100] A grid-connected photovoltaic (PV) power generation system includes a photovoltaic array, a high-frequency DC / DC boost circuit, a power electronic converter (inverter), and system monitoring. Its working principle is that solar radiation energy is converted by the photovoltaic array, then converted into high-voltage DC by a high-frequency DC converter, and finally inverted by the power electronic inverter to output a sinusoidal alternating current to the grid that is in phase with the grid voltage.

[0101] In some embodiments, the photovoltaic system may also be a lighting device, an energy storage device, or other similar device, as described in this application. For example, a photovoltaic device may be a solar water heater, a solar street light, or a solar photovoltaic generator.

[0102] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A photovoltaic junction box, characterized in that, The photovoltaic junction box is configured to be electrically connected to a photovoltaic panel and includes: Box body; A conductive component is disposed within the housing, and the conductive component includes a first wiring portion and a test portion that are independent of each other; the first wiring portion is configured to connect to the busbar of the photovoltaic panel; the test portion is configured to test the photovoltaic panel.

2. The photovoltaic junction box according to claim 1, characterized in that, The conductive element is in the form of a sheet.

3. The photovoltaic junction box according to claim 1 or 2, characterized in that, The housing includes a bottom wall, on which a through hole is provided; the through hole is configured to allow the busbar to pass through. The conductive component has a clearance hole, which is provided corresponding to the through hole; the busbar passes through the through hole and the clearance hole in sequence, and is connected to the first wiring portion of the conductive component on the side surface opposite to the bottom wall.

4. The photovoltaic junction box according to claim 3, characterized in that, Along the circumferential direction of the clearance hole, a portion of the conductive element serves as the first wiring portion, and a portion of the conductive element serves as the test portion.

5. The photovoltaic junction box according to claim 3 or 4, characterized in that, The conductive component further includes a second wiring portion connected to the side of the first wiring portion away from the clearance hole, extending in the direction of the first wiring portion away from the clearance hole, and configured to be electrically connected to a cable.

6. The photovoltaic junction box according to any one of claims 1-5, characterized in that, The first wiring portion has a groove on the side surface opposite to the bottom wall of the housing, the groove being configured to be electrically connected to the busbar; and / or The first wiring part and the test part are integrally formed.

7. The photovoltaic junction box according to any one of claims 1-6, characterized in that, The box has a bottom surface that is configured to face the photovoltaic panel; wherein the bottom surface has a first receiving groove that is configured to receive a barrier plate that is configured to block the photovoltaic panel.

8. The photovoltaic junction box according to claim 7, characterized in that, The bottom surface also has a second receiving groove; The photovoltaic junction box further includes an adhesive component, which is disposed in the second receiving groove and configured to be bonded and fixed to the photovoltaic panel.

9. The photovoltaic junction box according to claim 8, characterized in that, The first dimension of the box body along the first direction is greater than the second dimension of the box body along the second direction; the first direction is perpendicular to the second direction; The number of the second receiving slots is two, and the two second receiving slots are respectively located on both sides of the first receiving slot along the first direction; the second receiving slots extend along the second direction, and each second receiving slot contains one of the adhesive components.

10. A photovoltaic module, characterized in that, include: Photovoltaic panels; The photovoltaic junction box as described in any one of claims 1-9 is disposed on the photovoltaic panel and electrically connected to the photovoltaic panel.

11. The photovoltaic module according to claim 10, characterized in that, The photovoltaic panel includes a busbar and an outlet; the busbar extends out of the photovoltaic panel through the outlet; The photovoltaic module further includes a barrier plate, which is sandwiched between the photovoltaic panel and the photovoltaic junction box, blocks the outlet, and is located in the second receiving slot of the photovoltaic junction box.

12. A photovoltaic system, characterized in that, Including the photovoltaic module as described in claim 10 or 11.

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