Photovoltaic bypass device, photovoltaic module junction box, and photovoltaic module

Abstract

The present application relates to a photovoltaic bypass device, a photovoltaic module junction box, and a photovoltaic module. The photovoltaic bypass device comprises: a first conductive block (102) provided with a first welding area (202); a second conductive block (104) spaced apart from the first conductive block (102) and provided with a second welding area (204); a third conductive block (106) spaced apart from both the first conductive block (102) and the second conductive block (104) and provided with a third welding area (206); a first bypass element (108), a terminal of the first bypass element (108) that has a first polarity being electrically connected to the first conductive block (102), a terminal of the first bypass element (108) that has a second polarity being electrically connected to the third conductive block (106), the second polarity being opposite to the first polarity; and a second bypass element (110), a terminal of the second bypass element (110) that has the second polarity being electrically connected to the second conductive block (104), and a terminal of the second bypass element (110) that has the first polarity being electrically connected to the third conductive block (106).

Description

Photovoltaic bypass devices, photovoltaic module junction boxes and photovoltaic modules

[0001] Related applications

[0002] This application claims priority to Chinese patent application number 2023229441806, filed on November 1, 2023, entitled “Photovoltaic Bypass Device, Photovoltaic Module Junction Box and Photovoltaic Module,” the entire text of which is incorporated herein by reference. Technical Field

[0003] The present application relates to the technical field of solar photovoltaic modules, and in particular to a photovoltaic bypass device, a photovoltaic module junction box, and a photovoltaic module. Background Art

[0004] The statements herein merely provide background information related to the present application and do not necessarily constitute prior art.

[0005] The photovoltaic module junction box is a key component of the photovoltaic module's power generation system. As a connecting device between the photovoltaic module and the solar charging control device, its main function is to connect and protect the solar photovoltaic module, connect the power generated by the solar cell to the external circuit, and conduct the current generated by the photovoltaic module.

[0006] Typically, several split-type photovoltaic module junction boxes are used to connect the series-parallel battery strings in the photovoltaic module to the external circuit. Each split-type photovoltaic module junction box is installed with a bypass element corresponding to a battery string in the photovoltaic module. The bypass elements are electrically connected to two bus bars corresponding to the battery strings. Installation space for the photovoltaic module junction box needs to be reserved between the two bus bars connected to the same battery string, and the bus bars corresponding to the two parallel battery strings are arranged in parallel in a direction intersecting with the extension direction of the bus bars. It is necessary to increase the distance between the parallel bus bars to reserve installation space for the photovoltaic module junction box. A large number of photovoltaic module junction boxes are required, the cost is high, and the installation process is complicated.

[0007] Summary of the Invention

[0008] According to various embodiments of the present application, a photovoltaic bypass device, a photovoltaic assembly junction box, and a photovoltaic assembly are provided.

[0009] The present disclosure provides a photovoltaic bypass device, comprising:

[0010] A first conductive block is provided with a first welding area;

[0011] a second conductive block, spaced apart from the first conductive block and provided with a second welding area;

[0012] a third conductive block, spaced apart from the first conductive block and the second conductive block, and provided with a third welding area;

[0013] a first bypass element, wherein a first polarity terminal of the first bypass element is electrically connected to the first conductive block, a second polarity terminal of the first bypass element is electrically connected to the third conductive block, and the second polarity is opposite to the first polarity; and

[0014] The second bypass element has a second polarity terminal electrically connected to the second conductive block, and a first polarity terminal electrically connected to the third conductive block.

[0015] The present disclosure also provides a photovoltaic module junction box, including a box body, in which a receiving cavity is provided; a photovoltaic bypass device such as the above is provided in the receiving cavity; and a box cover, which is located above the photovoltaic bypass device and is detachably connected to the box body.

[0016] The present disclosure also provides a photovoltaic module, comprising:

[0017] The photovoltaic module junction box as described above; and

[0018] A photovoltaic panel body, comprising a first battery string and a second battery string connected in parallel, wherein a first polarity end of the first battery string is electrically connected to a first end of a first bus bar, a second polarity end of the first battery string is electrically connected to a first end of a second bus bar, a second polarity end of the second battery string is electrically connected to a first end of a third bus bar, and a first polarity end of the second battery string is electrically connected to a first end of the second bus bar;

[0019] The second end of the first bus bar is electrically connected to the second welding area, the second end of the second bus bar is electrically connected to the third welding area, and the second end of the third bus bar is electrically connected to the first welding area.

[0020] The details of one or more embodiments of the present disclosure are set forth in the accompanying drawings and the description below. Other features, objects, and advantages of the present application will become apparent from the description, drawings, and claims. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the conventional technology, the following briefly introduces the drawings required for use in the embodiments or the conventional technology descriptions. Obviously, the drawings described below are merely embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the disclosed drawings without any creative work.

[0022] FIG1 is a schematic structural diagram of a photovoltaic bypass device in one embodiment;

[0023] FIG2 is an electrical schematic diagram of a photovoltaic bypass device corresponding to FIG1 in one embodiment;

[0024] FIG3 is an electrical schematic diagram of the photovoltaic bypass device corresponding to FIG1 in another embodiment;

[0025] FIG4 is a schematic structural diagram of a photovoltaic bypass device in another embodiment;

[0026] FIG5 is a physical schematic diagram of a photovoltaic bypass device in another embodiment;

[0027] FIG6 is a schematic diagram of the structure of a photovoltaic module junction box according to an embodiment, wherein FIG6a is a schematic diagram of the structure of the photovoltaic module junction box after the box cover is removed, and FIG6b is a schematic diagram of the structure of the photovoltaic module junction box before the photovoltaic bypass device is placed in the box body;

[0028] FIG7 is a schematic structural diagram of a photovoltaic module in one embodiment.

[0029] Explanation of the accompanying drawings: 102, first conductive block; 104, second conductive block; 106, third conductive block; 108, first bypass element; 110, second bypass element; 112, first insulating plastic package; 114, second insulating plastic package; 202, first welding area; 204, second welding area; 206, third welding area; 208, first wire; 210, second wire; 212, first protrusion; 214, second protrusion; 216, first cable riveting part; 218, second cable riveting part; 302, box body; 304, photovoltaic bypass device; 306, first external connection part; 308, second external connection part; 402, photovoltaic module junction box; 404, photovoltaic panel body; 406, first battery; 408, second battery; 410, first bus bar; 412, second bus bar; third bus bar 414. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0031] To facilitate understanding of the present application, the present application will be described more fully below with reference to the accompanying drawings. The accompanying drawings provide embodiments of the present application. However, the present application may be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to make the disclosure of the present application more thorough and comprehensive.

[0032] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application pertains. The terms used herein in the specification of this application are for the purpose of describing specific embodiments only and are not intended to limit this application.

[0033] It is understood that the terms "first," "second," and the like used herein may be used to describe various elements herein, but these elements are not limited by these terms. These terms are only used to distinguish a first element from another element. For example, a first conductive block may be referred to as a second conductive block, and similarly, a second conductive block may be referred to as a first conductive block, without departing from the scope of this application. Both the first conductive block and the second conductive block are conductive blocks, but they are not the same conductive block.

[0034] It can be understood that the “connection” in the following embodiments should be understood as “electrical connection”, “communication connection”, etc. if there is transmission of electrical signals or data between the connected circuits, modules, units, etc.

[0035] As used herein, the singular forms "a," "an," and "the" may also include the plural forms, unless the context clearly indicates otherwise. It should also be understood that the terms "include," "comprising," "having," and the like specify the presence of stated features, integers, steps, operations, components, parts, or combinations thereof, but do not preclude the presence or addition of one or more other features, integers, steps, operations, components, parts, or combinations thereof. Furthermore, the term "and / or" as used in this specification includes any and all combinations of the relevant listed items.

[0036] Figure 1 is a schematic structural diagram of a photovoltaic bypass device in one embodiment, where the X direction is a first direction in which the first conductive block extends, the Y direction is a second direction intersecting the X direction, and the Z direction is a third direction representing the thickness of the first conductive block. The Z direction is perpendicular to the plane in which the X and Y directions lie.

[0037] As shown in FIG1 , in this embodiment, a photovoltaic bypass device is provided, including: a first conductive block 102, a second conductive block 104, a third conductive block 106, a first bypass element 108, and a second bypass element 110. A first welding area 202 is provided on the surface of the first conductive block 102; the second conductive block 104 is spaced apart from the first conductive block 102, and a second welding area 204 is provided on the surface of the second conductive block 104; the third conductive block 106 is spaced apart from the first conductive block 102 and the second conductive block 104, respectively, and a third welding area 206 is provided on the surface of the third conductive block 106; a first polarity terminal of the first bypass element 108 is electrically connected to the first conductive block 102, and a second polarity terminal of the first bypass element 108 is electrically connected to the third conductive block 106; a second polarity terminal of the second bypass element 110 is electrically connected to the second conductive block 104, and a first polarity terminal of the second bypass element 110 is electrically connected to the third conductive block 106.

[0038] Specifically, the first conductive block 102, the second conductive block 104, and the third conductive block 106 are all made of conductive material. The second polarity terminal of the first bypass element 108 and the first polarity terminal of the second bypass element 110 are electrically connected via the third conductive block 106. Welding one end of a cell string to the first welding region 202 electrically connects the cell string to the first polarity terminal of the first bypass element 108. Welding one end of another cell string to the second welding region 204 electrically connects the cell string to the second polarity terminal of the second bypass element 110. Welding the common connection end of the two cell strings to the third welding region 206 enables the cell strings to be connected in reverse parallel to the first bypass element 108 and the second bypass element 110, respectively. The first bypass element 108 can protect the cell string connected in reverse parallel between its two corresponding polarity terminals, preventing the solar cells in the cell string from being burned due to the hot spot effect. The second bypass element 110 has the same function.

[0039] It can be understood that the first welding area 202, the second welding area 204 and the third welding area 206 are also made of conductive materials, and the resistance of the material constituting each welding area is less than the resistance of the material constituting each corresponding conductive block. This setting reduces the contact resistance when the battery string is electrically connected to the conductive block, thereby reducing energy consumption.

[0040] The second conductive block 104 is spaced apart from the first conductive block 102, which means that the first conductive block 102 and the second conductive block 104 do not contact each other. Similarly, the third conductive block 106 and the first conductive block 102 do not contact each other, so that the first polarity terminal and the second polarity terminal of the first bypass element 108 are disconnected. The third conductive block 106 and the second conductive block 104 do not contact each other, so that the first polarity terminal and the second polarity terminal of the second bypass element 110 are disconnected.

[0041] The first bypass element 108 and the second bypass element 110 include bypass diodes or integrated circuits with bypass protection functions. Bypass protection protects batteries connected in reverse parallel at both ends without affecting the normal operation of the battery string. The first bypass element 108 and the second bypass element 110 each have a first polarity terminal and a second polarity terminal. The second polarity is opposite to the first polarity, representing positive and negative polarity, respectively. When the first polarity is positive, the second polarity is negative; when the first polarity is negative, the second polarity is positive.

[0042] In the photovoltaic bypass device described above, the first bypass element 108 and the second bypass element 110 can be used to connect two battery strings, which simplifies installation and reduces the number of photovoltaic module junction boxes used. At the same time, the second polarity terminal of the first bypass element 108 and the first polarity terminal of the second bypass element 110 can be simultaneously connected through the third welding area, which simplifies the structure, reduces the use of bus bars, and reduces production costs.

[0043] It is understood that in actual applications, the extension directions of the first conductive block 102, the second conductive block 104, and the third conductive block 106 can be adjusted as needed to simplify the connection between the photovoltaic bypass device and the battery string and facilitate the subsequent installation of the photovoltaic bypass device in the accommodating cavity of the photovoltaic module junction box. For example, as needed, the first conductive block 102 can extend along the first direction X, with the first welding area 202 located on one surface of the first conductive block 102 in the third direction Z; the second conductive block 104 can extend along the first direction X, with the second welding area 204 located on one surface of the second conductive block 102 in the third direction Z; and the third conductive block 106 can extend along the second direction Y, with the third welding area 206 located on one surface of the third conductive block 106 in the third direction Z.

[0044] In some embodiments, the first conductive block 102 , the second conductive block 104 , and the third conductive block extend in the same plane, and at least two of the first welding region 202 , the second welding region 204 , the third welding region 206 , the first bypass element 108 , and the second bypass element 110 are disposed on the surface of the same side of the corresponding conductive block. Exemplarily, the extension directions of the first conductive block 102, the second conductive block 104, and the third conductive block 106 are within the plane of the first direction X and the second direction Y. In the third direction Z, at least two of the first welding area 202, the second welding area 204, the third welding area 206, the first bypass element 108, and the second bypass element 110 are located on the surface of the same side of the corresponding conductive blocks. That is, when looking down at the photovoltaic bypass device in the third direction Z, at least two of the first welding area 202, the second welding area 204, the third welding area 206, the first bypass element 108, and the second bypass element 110 can be seen. This arrangement simplifies the restrictions on the shape of the accommodating cavity provided in the box body of the photovoltaic module junction box for installing the photovoltaic bypass device, thereby facilitating the subsequent installation of the photovoltaic bypass device in the accommodating cavity of the photovoltaic module junction box.

[0045] Furthermore, to facilitate electrical connection between the cell string and the first welding region 202, the second welding region 204, and the third welding region 206 while also increasing the stability of the electrical connection, the first welding region 202, the second welding region 204, the third welding region 206, the first bypass element 108, and the second bypass element 110 are positioned on the same side of the photovoltaic bypass device. Specifically, when viewing the photovoltaic bypass device from above in the third direction Z, the first welding region 202, the second welding region 204, the third welding region 206, the first bypass element 108, and the second bypass element 110 are all visible.

[0046] As shown in FIG1 , in some embodiments, the second polarity terminal of the first bypass element 108 is bonded to the third conductive block 106. For example, conductive glue (e.g., conductive silver glue) is used to bond the second polarity terminal of the first bypass element 108 to the third conductive block 106. The bonding arrangement can reduce the contact resistance between the second polarity terminal of the first bypass element 108 and the third conductive block 106. By selecting a conductive glue with excellent conductivity, the contact resistance between the first bypass element 108 and the third conductive block 106 can be further reduced. The first polarity terminal of the first bypass element 108 is connected to the third conductive block 106 through the first wire. 208 is electrically connected to the first conductive block 102. The first conductor 208 is used to transmit current between the first polarity terminal of the first bypass element 108 and the first conductive block 102, and may include but is not limited to a metal conductor or a jumper wire. The second polarity terminal of the second bypass element 110 is disposed in contact with the second conductive block 104, and the first polarity terminal of the second bypass element 110 is electrically connected to the third conductive block 106 via a second conductor 210. By arranging the first bypass element 108 and the second bypass element 110 on different conductive blocks, the area of ​​the conductive blocks can be reduced, the overall size of the photovoltaic bypass device can be reduced, and the production cost can be reduced. The size of the photovoltaic module junction box including the photovoltaic bypass device can be reduced, thereby reducing the area occupied by the photovoltaic module junction box, increasing the effective light-receiving area of ​​the battery, and improving the battery's power generation efficiency.

[0047] It is understandable that the second polarity terminal of the first bypass element 108 is located on a surface of the first bypass element 108 close to the third conductive mass 106, and the first polarity terminal of the first bypass element 108 is located on a surface of the first bypass element 108 facing away from the third conductive mass 106; the second polarity terminal of the second bypass element 110 is located on a surface of the second bypass element 110 close to the second conductive mass 104, and the first polarity terminal of the second bypass element 110 is located on a surface of the second bypass element 110 facing away from the second conductive mass 104. The first bypass element 108 and the second bypass element 110 have the same device structure. For example, the first bypass element 108 and the second bypass element 110 are diodes made of wafers with the same doping type. This eliminates the impact of the different structures of the first bypass element 108 and the second bypass element 110 on current transmission, simplifying selection.

[0048] FIG2 is an electrical schematic diagram of the photovoltaic bypass device corresponding to FIG1 in one embodiment. As shown in FIG2 , the second polarity terminal of the first bypass element 108 is the positive electrode of the first bypass element 108 , the first polarity terminal of the first bypass element 108 is the negative electrode of the first bypass element 108 , the second polarity terminal of the second bypass element 110 is the positive electrode of the second bypass element 110 , and the first polarity terminal of the second bypass element 110 is the negative electrode of the second bypass element 100 . That is, the positive electrode of the first bypass element 108 and the negative electrode of the second element 110 are electrically connected via the third conductive block 106 , and the positive electrode of the first bypass element 108 and the negative electrode of the second element 110 are led out via the third pad area 206 on the third bypass element 106 .

[0049] FIG3 is an electrical schematic diagram of the photovoltaic bypass device corresponding to FIG1 in another embodiment. As shown in FIG3 , the second polarity terminal of the first bypass element 108 is the negative electrode of the first bypass element 108 , the first polarity terminal of the first bypass element 108 is the positive electrode of the first bypass element 108 , the second polarity terminal of the second bypass element 110 is the negative electrode of the second bypass element 110 , and the first polarity terminal of the second bypass element 110 is the positive electrode of the second bypass element 100 . That is, the negative electrode of the first bypass element 108 and the positive electrode of the second element 110 are electrically connected via the third conductive block 106 , and the negative electrode of the first bypass element 108 and the positive electrode of the second element 110 are led out via the third pad area 206 on the third bypass element 106 .

[0050] FIG4 is a schematic structural diagram of a photovoltaic bypass device according to another embodiment. As shown in FIG4 , in this embodiment, the second polarity terminal of the first bypass element 108 is disposed in contact with the third conductive block 106, and the first polarity terminal of the first bypass element 108 is electrically connected to the first conductive block 102 via a first wire 208; the first polarity terminal of the second bypass element 110 is disposed in contact with the third conductive block 106, and the second polarity terminal of the second bypass element 110 is electrically connected to the second conductive block via a second wire 210. This allows the first bypass element 108, the second bypass element 110, and the third conductive block 106 to be simultaneously contacted, resulting in a simple process, a short cycle, and low cost.

[0051] It can be understood that the second polarity terminal of the first bypass element 108 is located on the surface of the first bypass element 108 close to the third conductive mass 106, and the first polarity terminal of the first bypass element 108 is located on the surface of the first bypass element 108 away from the third conductive mass 106; the first polarity terminal of the second bypass element 110 is located on the surface of the second bypass element 110 close to the third conductive mass 106, and the first polarity terminal of the second bypass element 110 is located on the surface of the second bypass element 110 away from the third conductive mass 106. The device structures of the first bypass element 108 and the second bypass element 110 are different. Exemplarily, the first bypass element 108 and the second bypass element 110 are diodes made of wafers of different doping types, including N-type doped wafers and P-type doped wafers. This eliminates the structural restrictions on the first bypass element 108 and the second bypass element 110, and reduces the requirements for the first bypass element 108 and the second bypass element 110. As shown in Figures 1 and 4, in some embodiments, the two ends of the third conductive block 106 are respectively provided with a first protrusion 212 facing the first conductive block 102 and a second protrusion 214 facing the second conductive block 104, so that the photovoltaic bypass device can be stably installed in the accommodating cavity of the photovoltaic module junction box to prevent the photovoltaic bypass device from moving in the accommodating cavity.

[0052] In some embodiments, the distance between the first protrusion 212 and the first conductive block 102 is equal to the distance between the second protrusion 214 and the second conductive block 104 , which simplifies the mold structure for preparing the photovoltaic module junction box body and reduces costs.

[0053] As shown in FIG4 , in some embodiments, the third conductive block 106 is symmetrical about the central axis of the third welding region 206 , where the central axis is perpendicular to the direction from the first conductive block 102 toward the second guide block 104 . For example, the first direction X is perpendicular to the second direction Y, and the central axis extends along the first direction X. Specifically, the symmetry axis of the third conductive block 106 coincides with the symmetry axis of the third welding region 206 , facilitating subsequent electrical connection between the third welding region 206 and the busbar, thereby reducing the complexity of the photovoltaic panel.

[0054] In some embodiments, the first conductive block 102 and the second conductive block 104 both extend along the first direction X and are spaced apart along the second direction Y. In the first direction X, the first conductive block 102 and the second conductive block 104 are located on the same side of the third conductive block 106. The second direction X intersects with the first direction Y, which facilitates the installation of the photovoltaic bypass device in the box body of the photovoltaic module junction box and the subsequent electrical connection between the bus bar and the first welding area 202, the second welding area 204, and the third welding area 206.

[0055] FIG5 is a schematic diagram of a photovoltaic bypass device in another embodiment. As shown in FIG5 , in one embodiment, the photovoltaic bypass device further includes a first insulating plastic package 112 and a second insulating plastic package 114. The first insulating plastic package 112 covers the first bypass element 108, the first wire 208, the partial area of ​​the first conductive block 102 connected to the first wire 208, and the partial area of ​​the third conductive block 106 where the first bypass element 108 is set; the second insulating plastic package 114 is spaced apart from the first insulating plastic package 112 and covers the second bypass element 110, the second wire 210, and the partial area of ​​the third conductive block 106 connected to the second wire 210. The second conductive block 104 is provided with a partial area of ​​the second bypass element 110. By providing the first insulating plastic package 112 and the second insulating plastic package 114, the influence of the external environment on the first bypass element 108, the first wire 208, the second bypass element 110 and the second wire 210 can be eliminated. The second insulating plastic package 114 and the first insulating plastic package 112 are spaced apart so that a fixing strip located between the first insulating plastic package 112 and the second insulating plastic package 114 can be provided in the box body of the photovoltaic module junction box, so that the photovoltaic bypass device can be stably installed in the accommodating cavity of the photovoltaic module junction box to prevent the photovoltaic bypass device from moving in the accommodating cavity.

[0056] As shown in FIG5 , in some examples, the first conductive block 102 is provided with a first cable rivet 216, located on a side of the first conductive block 102 facing away from the third conductive block 106. The second conductive block 104 is provided with a second cable rivet 218, located on a side of the second conductive block 104 facing away from the third conductive block 106. The first cable rivet 216 allows the first conductive block 102 to be riveted to the cable, thereby allowing the polarity ends of the battery strings connected in reverse parallel at both ends of the first bypass element 108 to be electrically connected to the first welding region 202 through the cable, facilitating the connection of the battery strings to corresponding locations to provide electrical energy. The second cable rivet 218 allows the second conductive block 104 to be riveted to the cable, thereby allowing the polarity ends of the battery strings connected in reverse parallel at both ends of the second bypass element 110 to be electrically connected to the second welding region 204 through the cable, facilitating the connection of the battery strings to corresponding locations to provide electrical energy.

[0057] Figure 6 is a structural schematic diagram of a photovoltaic module junction box in an embodiment, 6a in Figure 6 is a structural schematic diagram of the photovoltaic module junction box after the box cover is removed, and 6b in Figure 6 is a structural schematic diagram of the photovoltaic module junction box before the photovoltaic bypass device is placed in the box body. As shown in Figures 5 and 6, in this embodiment, the photovoltaic module junction box includes a box body 302, a box cover (not shown) and the photovoltaic bypass device 304 as described above, and a accommodating cavity is provided in the box body 302; the photovoltaic bypass device 304 is provided in the accommodating cavity; the box cover is located above the photovoltaic bypass device 304 and is detachably connected to the box body 302 to protect the photovoltaic bypass device 304 from the influence of the external environment.

[0058] In the aforementioned photovoltaic module junction box, the first bypass element 108 and the second bypass element 110 of the photovoltaic bypass device 304 can be used to connect two cell strings, simplifying installation and reducing the number of photovoltaic module junction boxes required. Furthermore, the third welding area 206 can simultaneously connect a bus bar to the second polarity terminal of the first bypass element 108 and the first polarity terminal of the second bypass element 110. This simplifies the structure, reduces the number of bus bars required, and lowers production costs. This reduces the footprint of the photovoltaic module junction box, increases the effective light-receiving area of ​​the cells, and improves the power generation efficiency of the cells.

[0059] In some embodiments, the first conductive block 102 and the second conductive block 104 extend along the first direction X and are arranged at intervals along the second direction Y. In the first direction X, the first conductive block 102 and the second conductive block 104 are located on the same side of the third conductive block 106. The second direction Y intersects with the first direction X, which facilitates the installation of the photovoltaic bypass device in the box body of the photovoltaic module junction box and the subsequent electrical connection between the busbar electrically connected to the battery string and the first welding area 202, the second welding area 204, and the third welding area 206.

[0060] As shown in FIG6 , in some embodiments, the photovoltaic module junction box further includes a first external connection portion 306 and a second external connection portion 308 . The first external connection portion 306 is riveted to the first cable rivet portion 216 and is used to lead out the second polarity end of the photovoltaic panel body. The second polarity end of the photovoltaic panel body can be subsequently connected to a corresponding location to provide electrical energy. The second external connection portion 308 is riveted to the second cable rivet portion 218 and is used to lead out the first polarity end of the photovoltaic panel body. The first polarity end of the photovoltaic panel body can be subsequently connected to a corresponding location to provide electrical energy. When the first polarity is positive, the second polarity is negative; conversely, when the first polarity is negative, the second polarity is positive. By providing the first external connection portion 306 and the second external connection portion 308, the positive and negative poles of the photovoltaic panel body connected to the photovoltaic module junction box are led out to the outside and subsequently connected to a corresponding location to provide electrical energy.

[0061] In some embodiments, at least two of the first welding area 202, the second welding area 204, the third welding area 206, the first bypass element 108, and the second bypass element 110 are arranged on the side of each corresponding conductive block away from the bottom of the box body 302 (close to the box cover). This arrangement simplifies the restrictions on the shape of the accommodating cavity of the box body 302 of the photovoltaic module junction box for installing the photovoltaic bypass device, making it easier to subsequently connect the photovoltaic module junction box to the photovoltaic panel body.

[0062] FIG7 is a schematic diagram of the structure of a photovoltaic module in an embodiment. The present disclosure further provides a photovoltaic module, comprising: a photovoltaic module junction box 402 and a photovoltaic panel body 404 as described above, wherein the photovoltaic panel body 404 comprises a first battery string and a second battery string connected in parallel, wherein the first battery string is formed by a plurality of first batteries 406 connected in series, and the second battery string is formed by a plurality of second batteries 408 connected in series, and optionally, the number of first batteries 406 and second batteries 408 is the same; a first polarity end of the first battery string is electrically connected to a first end of a first bus bar 410, and a second polarity end of the first battery string is electrically connected to a first end of a second bus bar 412. After the first batteries 406 are connected in series, One end of the formed battery string is the first polarity end of the first battery string, and the other end is the second polarity end of the first battery string. One of the first polarity end and the second polarity end is a positive pole and the other is a negative pole. FIG7 takes the first polarity end as a negative pole and the second polarity end as a positive pole as an example; the second polarity end of the second battery string is electrically connected to the first end of the third bus bar 414, and the first polarity end of the second battery string is electrically connected to the first end of the second bus bar 412; wherein, the second end of the first bus bar 410 is electrically connected to the second welding area 204, the second end of the second bus bar 412 is electrically connected to the third welding area 206, and the second end of the third bus bar 414 is electrically connected to the first welding area 202.

[0063] In the above photovoltaic module, the second end of the first bus bar 410 is electrically connected to the second welding area 204 to realize the electrical connection between the first polarity end of the first battery string and the second welding area 204, and the second end of the second bus bar 412 is electrically connected to the third welding area 206. Through one bus bar and one electrical connection, the electrical connection between the second polarity end of the first battery string, the first polarity end of the second battery string and the third welding area 206 is realized at the same time. The structure is simple, the number of bus bars is reduced, and the number of connections between the bus bars and the welding areas is reduced, thereby reducing the production cost and simplifying the installation. The second end of the third bus bar 414 is electrically connected to the first welding area 20 2 electrical connection, realizing electrical connection between the second polarity end of the second battery string and the first welding area 202. In the present disclosure, the first bypass element 108 is connected to the second battery string, and the second bypass element 110 is connected to the first battery string. Two battery strings are connected simultaneously through one photovoltaic module junction box 402, which reduces the number of photovoltaic module junction boxes 402, reduces the installation space of the photovoltaic module junction boxes 402, shortens the distance between the first bus bar 410 and the third bus bar 414, thereby reducing the occupied area of ​​the photovoltaic module junction box 402, increasing the effective light-receiving area of ​​the photovoltaic panel 404, and improving the power generation efficiency of the photovoltaic module.

[0064] Throughout this specification, references to terms such as "some embodiments," "other embodiments," and "desired embodiments" indicate that a particular feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present application. The schematic descriptions of these terms throughout this specification do not necessarily refer to the same embodiment or example.

[0065] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0066] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that a person of ordinary skill in the art may make various modifications and improvements without departing from the spirit of the present application, and these modifications and improvements fall within the scope of protection of the present application. Therefore, the scope of protection of the present patent application shall be determined by the appended claims.

Claims

1. A photovoltaic bypass device, comprising: A first conductive block is provided with a first welding area; A second conductive block, spaced apart from the first conductive block, and provided with a second welding area; A third conductive block, spaced apart from the first conductive block and the second conductive block, and provided with a third welding area; a first bypass element, wherein a first polarity terminal of the first bypass element is electrically connected to the first conductive block, a second polarity terminal of the first bypass element is electrically connected to the third conductive block, and the second polarity is opposite to the first polarity; as well as A second bypass element, wherein a second polarity terminal of the second bypass element is electrically connected to the second conductive block, and a first polarity terminal of the second bypass element is electrically connected to the third conductive block.

2. The photovoltaic bypass device according to claim 1, wherein the second polarity terminal of the first bypass element is fitted with the third conductive block, and the first polarity terminal of the first bypass element is electrically connected to the first conductive block through a first wire; the second polarity terminal of the second bypass element is fitted with the second conductive block, and the first polarity terminal of the second bypass element is electrically connected to the third conductive block through a second wire. 3 . The photovoltaic bypass device according to claim 2 , wherein the first bypass element and the second bypass element have the same device structure.

4. The photovoltaic bypass device according to claim 1, wherein the second polarity terminal of the first bypass element is fitted with the third conductive block, and the first polarity terminal of the first bypass element is electrically connected to the first conductive block through a first wire; the first polarity terminal of the second bypass element is fitted with the third conductive block, and the second polarity terminal of the second bypass element is electrically connected to the second conductive block through a second wire. 5 . The photovoltaic bypass device according to claim 1 , wherein two ends of the third conductive block are respectively provided with a first protrusion facing the first conductive block and a second protrusion facing the second conductive block. 6 . The photovoltaic bypass device according to claim 5 , wherein a distance between the first protrusion and the first conductive block is equal to a distance between the second protrusion and the second conductive block. 7 . The photovoltaic bypass device according to claim 5 , wherein the third conductive block is symmetrical about a central axis of the third welding area, and the central axis is perpendicular to a direction from the first conductive block toward the second guide block.

8. The photovoltaic bypass device according to claim 1, wherein the first conductive block and the second conductive block extend along a first direction and are arranged at intervals along a second direction, and in the first direction, the first conductive block and the second conductive block are located on the same side of the third conductive block; in, The second direction intersects the first direction. 9 . The photovoltaic bypass device according to claim 1 , wherein the first bypass element and the second bypass element comprise bypass diodes or integrated circuits with a bypass protection function.

10. The photovoltaic bypass device according to claim 2, wherein the photovoltaic bypass device further comprises: a first insulating plastic package, covering the first bypass element, the first wire, a partial area of ​​the first conductive block connected to the first wire, and a partial area of ​​the third conductive block where the first bypass element is disposed; as well as The second insulating plastic package is spaced apart from the first insulating plastic package and covers the second bypass element, the second wire, a partial area of ​​the third conductive block connected to the second wire, and a partial area of ​​the second conductive block where the second bypass element is arranged.

11. The photovoltaic bypass device according to claim 1, wherein the extension directions of the first conductive block, the second conductive block and the third conductive block are in the same plane, and at least two of the first welding area, the second welding area, the third welding area, the first bypass element and the second bypass element are arranged on the surface of the same side of the corresponding conductive block.

12. The photovoltaic bypass device according to claim 1, wherein the first conductive block is provided with a first cable rivet portion, located on a side of the first conductive block away from the third conductive block, and the second conductive block is provided with a second cable rivet portion, located on a side of the second conductive block away from the third conductive block.

13. A photovoltaic module junction box, comprising: A box body, wherein a receiving cavity is provided in the box body; The photovoltaic bypass device according to any one of claims 1 to 12, arranged in the accommodating cavity; and The box cover is located above the photovoltaic bypass device and is detachably connected to the box body.

14. The photovoltaic module junction box according to claim 13, wherein at least two of the first welding area, the second welding area, the third welding area, the first bypass element and the second bypass element are arranged on a side of each corresponding conductive block away from the bottom of the box body.

15. A photovoltaic module, comprising: The photovoltaic module junction box according to claim 13 or 14; as well as A photovoltaic panel body, comprising a first battery string and a second battery string connected in parallel, wherein a first polarity end of the first battery string is electrically connected to a first end of a first bus bar, a second polarity end of the first battery string is electrically connected to a first end of a second bus bar, a second polarity end of the second battery string is electrically connected to a first end of a third bus bar, and a first polarity end of the second battery string is electrically connected to a first end of the second bus bar; The second end of the first bus bar is electrically connected to the second welding area, the second end of the second bus bar is electrically connected to the third welding area, and the second end of the third bus bar is electrically connected to the first welding area.

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