Photovoltaic junction box and photovoltaic module

Abstract

The invention provides a photovoltaic junction box and a photovoltaic module. The photovoltaic junction box comprises a first conductor, a second conductor, a third conductor, a first chip and a second chip. The first chip is electrically connected with the first conductor and the second conductor, and the second chip is electrically connected with the second conductor and the third conductor. The first hole in the first conductor is close to the second conductor relative to the first welding part, and the third hole in the third conductor is close to the second conductor relative to the third welding part. In the width direction of the photovoltaic junction box, the second conductor comprises a first edge and a second edge, the distance between the geometric center of the second hole of the second conductor and the first edge is larger than the distance between the geometric center of the second hole and the second edge, and the second welding part is arranged between the second hole and the first edge. The bus bars penetrating through all the holes can obtain a large welding space, no shielding exists in the welding direction, and welding operation is facilitated.

Description

Photovoltaic junction boxes and photovoltaic modules Technical Field

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

[0002] Photovoltaic junction boxes contain photovoltaic wiring components, which can also be called diode components. Existing photovoltaic wiring components have a conductor with a chip and holes for the busbar to pass through. The busbar passes through the holes and is then soldered to the conductor. However, the limited space for soldering the busbar due to the chip and the molded enclosure results in a small area, hindering soldering operations and improving soldering quality. Summary of the Invention

[0003] The purpose of this application is to provide a photovoltaic junction box and photovoltaic module to increase the welding space and welding area of ​​the busbar and improve the welding quality.

[0004] In a first aspect, this application provides a photovoltaic junction box, comprising: a first conductor having a first hole and a first welding portion; a second conductor having a second hole and a second welding portion; a third conductor having a third hole and a third welding portion; a first chip having one end electrically connected to the first conductor and the other end electrically connected to the second conductor; a second chip having one end electrically connected to the third conductor and the other end electrically connected to the second conductor; wherein the first conductor, the second conductor, and the third conductor are arranged at intervals along the length direction of the photovoltaic junction box, the first hole is closer to the second conductor relative to the first welding portion, and the third hole is closer to the second conductor relative to the third welding portion; in the width direction of the photovoltaic junction box, the second conductor includes a first edge and a second edge, the distance between the geometric center of the second hole and the first edge is greater than the distance between the geometric center of the second hole and the second edge, and the second welding portion is disposed between the second hole and the first edge.

[0005] In one possible implementation, the distance between the geometric center of the second hole and the first edge is h1, and the distance between the geometric center of the second hole and the second edge is h2, where 1 < h1 / h2 ≤ 3.

[0006] In one possible implementation, the photovoltaic junction box further includes a first molding compound and a second molding compound. The first molding compound is connected to the first conductor and the second conductor, which are separated by the first molding compound. The first chip is encapsulated between the first molding compound and the first conductor. The second molding compound is connected to the third conductor and the second conductor, which are separated by the second molding compound. The second chip is encapsulated between the second molding compound and the second conductor.

[0007] In one possible implementation, the first encapsulation body is provided with a first extension, the first extension being connected to the second conductor, and the first extension being located on the side of the second hole away from the second solder portion, the first extension extending toward the second encapsulation body; and / or, the second encapsulation body is provided with a second extension, the second extension being connected to the second conductor, and the second extension being located on the side of the second hole away from the second solder portion, the second extension extending toward the first encapsulation body.

[0008] In one possible implementation, the second conductor is provided with a fixing hole, which is disposed between the first molding compound and the second molding compound, and the fixing hole is located on the side of the second hole away from the second welding part.

[0009] In one possible implementation, along the width direction of the photovoltaic junction box, the width ratio of the first conductor to the second conductor is greater than or equal to 0.8 and less than or equal to 1.2, and the width ratio of the third conductor to the second conductor is greater than or equal to 0.8 and less than or equal to 1.2.

[0010] In one possible implementation, the cross-sectional shape of the first conductor, the second conductor, and the third conductor is rectangular within the plane formed by the length and width directions of the photovoltaic junction box.

[0011] In one possible implementation, the first conductor has a first protrusion, the second conductor has a first recess, at least a portion of the first protrusion is located in the first recess, and there is a gap between the outer wall surface of the first protrusion and the inner wall surface of the first recess, and at least a portion of the first chip is disposed on the first protrusion; and / or, the second conductor has a second protrusion, the third conductor has a second recess, at least a portion of the second protrusion is located in the second recess, and there is a gap between the outer wall surface of the second protrusion and the inner wall surface of the second recess, and at least a portion of the second chip is disposed on the second protrusion.

[0012] In one possible implementation, the first hole, the second hole, and the third hole are elongated, with the first hole and the third hole extending along the width direction of the photovoltaic junction box, and the second hole extending along the length direction of the photovoltaic junction box.

[0013] In one possible implementation, the first chip is disposed on the first conductor and is electrically connected to the second conductor via a first jumper; the second chip is disposed on the second conductor and is electrically connected to the third conductor via a second jumper.

[0014] Secondly, this application also provides a photovoltaic module, which includes a battery string, a first busbar, a second busbar, a third busbar, and a photovoltaic junction box provided in the first aspect of this application; the battery string is electrically connected to the first busbar, the second busbar, and the third busbar respectively; the first busbar passes through the first hole and is electrically connected to the first welded part; the second busbar passes through the second hole and is electrically connected to the second welded part; the third busbar passes through the third hole and is electrically connected to the third welded part.

[0015] The technical solution provided in this application achieves the following beneficial effects: The photovoltaic junction box and photovoltaic module provided in this application, by configuring the holes for passing through the busbars and the corresponding welding positions, allow the two busbars passing through the first and second holes to bend in a direction away from each other and without being obstructed by plastic encapsulation material. The busbar passing through the second hole bends along the width direction of the photovoltaic junction box, allowing each busbar to obtain a larger welding operation space, facilitating welding operations. Simultaneously, by making the distance between the geometric center of the second hole and the first edge greater than the distance between the geometric center of the second hole and the second edge, the second conductor can have a larger area as a second welding part in the bending direction of the busbar passing through the second hole, ensuring the welding reliability of the second busbar and providing more ample space for welding operations.

[0016] It should be understood that the above general description and the following detailed description are merely exemplary and do not limit this application. Attached Figure Description

[0017] Figure 1 is a structural schematic diagram of a photovoltaic junction box provided in one embodiment of this application; Figure 2 is a partial structural schematic diagram of a photovoltaic junction box provided in one embodiment of this application; Figure 3 is a top view of a partial structure of a photovoltaic junction box provided in one embodiment of this application; Figure 4 is a structural schematic diagram of a photovoltaic junction box provided in one embodiment of this application from a top view; Figure 5 is a structural schematic diagram of a photovoltaic junction box provided in another embodiment of this application; Figure 6 is a top view of a partial structure of a photovoltaic junction box provided in another embodiment of this application; Figure 7 is an exploded view of a photovoltaic junction box provided in another embodiment of this application; Figure 8 is a partial structural schematic diagram of a photovoltaic junction box provided in another embodiment of this application.

[0018] Reference numerals: 1-First conductor; 11-First hole; 12-First solder joint; 13-First protrusion; 2-Second conductor; 21-Second hole; 22-Second solder joint; 23-First edge; 24-Second edge; 25-Fixing hole; 26-First recess; 27-Second protrusion; 3-Third conductor; 31-Third hole; 32-Third solder joint; 33-Second recess; 4-First chip; 5-Second chip; 6-First encapsulation; 61-First extension; 7-Second encapsulation; 72-Second extension; 8-First jumper; 9-Second jumper; Y-width direction; X-length direction.

[0019] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0021] In the description of this application, unless otherwise expressly specified and limited, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance; unless otherwise specified or explained, the term "multiple" refers to two or more; the terms "connected," "fixed," etc., should be interpreted broadly. For example, "connected" can be a fixed connection, a detachable connection, an integral connection, or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0022] In the description of this specification, it should be understood that the directional terms such as "upper" and "lower" used in the embodiments of this application are used to describe the angles shown in the accompanying drawings and should not be construed as limiting the embodiments of this application. Furthermore, in the context, it should also be understood that when it is mentioned that an element is connected "upper" or "lower" to another element, it can be directly connected to the other element "upper" or "lower," or indirectly connected to the other element "upper" or "lower" through an intermediate element.

[0023] A photovoltaic (PV) junction box contains PV wiring components, also known as diode modules or bypass diode modules. These are the core components of a PV power generation system, providing a current bypass path to prevent hot spot effects and ensure system safety and power generation efficiency. A PV junction box typically consists of a conductive metal body, a semiconductor chip (such as a diode chip) soldered onto the conductor, and an external plastic encapsulation. The conductor has holes or slots designed for the busbar to pass through. After passing through these holes, the busbar is electrically and mechanically connected to the conductor by soldering. The busbar collects current from the PV cell strings.

[0024] However, because the chip itself needs to occupy a certain area on the conductor, and to ensure insulation, heat dissipation, and mechanical strength, the chip is usually tightly wrapped by a plastic package. This results in very limited locations for busbars to pass through and a very limited flat area around the chip suitable for soldering. Furthermore, the presence of the plastic package often restricts the soldering operation space in three dimensions, not only narrowing the soldering plane but also easily interfering with the angle of the soldering torch or iron and heat transfer. This spatial limitation reduces the visibility and accessibility of the soldering operation, increases the difficulty of soldering or positioning, and easily leads to misalignment and reduced soldering quality.

[0025] In view of this, the present application provides a photovoltaic junction box that can expand the welding area and welding operation space of the busbar while ensuring the miniaturization of the photovoltaic junction box.

[0026] As shown in Figures 1 and 2, the photovoltaic junction box includes a first conductor, a second conductor, a third conductor, a first chip, and a second chip. The first, second, and third conductors can be stamped from copper. The first, second, and third conductors are arranged at intervals along the length of the photovoltaic junction box, with the second conductor located between the first and third conductors. This independent and spaced arrangement of the three conductors along the length of the photovoltaic junction box avoids the risk of short circuits caused by simultaneous contact between the positive and negative conductors during welding of the external busbar.

[0027] One end of the first chip is electrically connected to a first conductor, and the other end of the first chip is electrically connected to a second conductor. One end of the second chip is electrically connected to a third conductor, and the other end of the second chip is electrically connected to a second conductor. For example, the anode of the first chip can be electrically connected to the first conductor, and the cathode can be electrically connected to the second conductor to form a bypass diode. The anode of the second chip can be electrically connected to the second conductor, and the cathode can be electrically connected to the third conductor to form another bypass diode.

[0028] The first conductor has a first hole and a first welding part, the second conductor has a second hole and a second welding part, and the second conductor has a third hole and a third welding part.

[0029] The first, second, and third holes are used to pass through the external busbar. The busbar is typically flat; to ensure it passes smoothly through the corresponding holes, the first, second, and third holes can be elongated through-holes corresponding to the shape of the busbar. The first weld portion is a portion of the flat surface area on the first conductor, used for welding the external busbar. Similarly, the second weld portion is a portion of the flat surface area on the second conductor, and the third weld portion is a portion of the flat surface area on the third conductor.

[0030] The first hole is closer to the second conductor relative to the first weld portion, meaning the distance from the first hole to the second conductor is less than the distance from the first weld portion to the second conductor. The third hole is closer to the second conductor relative to the third weld portion, meaning the distance from the third hole to the second conductor is less than the distance from the third weld portion to the second conductor.

[0031] When the photovoltaic junction box needs to be installed onto the photovoltaic module, the busbars can pass through the first hole, second hole, and third hole respectively, and then be welded to the corresponding welding parts to achieve electrical conduction. For example, for ease of explanation, the external busbars (not shown in the figure) are defined as a first busbar, a second busbar, and a third busbar. The first busbar can pass through the first hole and bend away from the second conductor to weld to the first welding part. There is no plastic encapsulation material obstructing the bending direction of the first busbar, providing a large welding operation space and avoiding interference caused by plastic encapsulation material obstructing the welding operation space. Similarly, the third busbar can pass through the third hole and bend away from the second conductor to weld to the third welding part. There is also no plastic encapsulation material obstructing the bending direction of the third busbar, providing a large welding operation space and avoiding interference caused by plastic encapsulation material obstructing the welding operation space.

[0032] As shown in Figure 3, along the width direction of the photovoltaic junction box, the second conductor includes a first edge and a second edge. The distance between the geometric center of the second hole and the first edge is h1, and the distance between the geometric center of the second hole and the second edge is h2, where h1 > h2. The second welding part is disposed between the second hole and the first edge.

[0033] After passing through the second hole, the second busbar bends towards the side of the second weld joint. Since the second hole and the second weld joint are arranged along the width of the photovoltaic junction box, the bending direction of the second busbar after passing through the second hole is parallel or nearly parallel to the width of the photovoltaic junction box. In this direction, there is no obstruction from the plastic encapsulation material, allowing the second busbar a larger welding operation space. Simultaneously, because h1 > h2, the second conductor can have a larger area as the second weld joint along the bending direction of the second busbar, ensuring the welding reliability of the second busbar and providing more ample space for welding operations.

[0034] The ratio of h1 to h2 needs to meet a certain range. If the ratio of h1 / h2 is too large, the width of the portion of the second conductor on the side of the second hole away from the second welded part will be small, making it prone to breakage. If the ratio of h1 / h2 is too small, the area of ​​the second welded part will be small, resulting in low reliability of the busbar welding. In this embodiment, 1 < h1 / h2 ≤ 3. The specific values ​​of h1 and h2 are obtained by measuring the vertical distance from the geometric center of the second hole to the corresponding edge of the second conductor. For example, the ratio of h1 / h2 can be, but is not limited to, 1.5, 2, 2.5, or 3.

[0035] By setting the second hole to be offset towards the second edge of the second conductor, the ratio h1 / h2 is made greater than 1, ensuring that the second weld portion has a significantly larger area than the other side. This provides a sufficient and reliable operating area for busbar welding, significantly improving the connection reliability and strength of the external busbar welding. Simultaneously, setting the upper limit of the ratio h1 / h2 to less than or equal to 3 ensures that the portion of the second conductor away from the second weld portion still has sufficient width, thus avoiding the risk of breakage under mechanical stress due to excessive narrowness in this area.

[0036] As shown in Figures 1 and 2, the photovoltaic junction box further includes a first molding compound and a second molding compound. The first molding compound is connected to a first conductor and a second conductor, which are separated by the first molding compound. A first chip is encapsulated between the first molding compound and the first conductor. The second molding compound is connected to a third conductor and a second conductor, which are separated by the second molding compound. A second chip is encapsulated between the second molding compound and the second conductor.

[0037] The first molding compound can be made of epoxy resin and encapsulated in the area between the first and second conductors, as well as on the first chip, using an injection molding process. The first molding compound is integrally formed with the first and second conductors through injection molding, thereby physically and electrically separating the first and second conductors. The second molding compound can also be made of epoxy resin and encapsulated in the area between the third and second conductors, as well as on the second chip, using an injection molding process. The second molding compound is integrally formed with the third and second conductors through injection molding, thereby physically and electrically separating the third and second conductors. A gap is left between the first and second molding compounds, exposing a portion of the upper surface area of ​​the second conductor to facilitate connection and fixation with other nearby structures.

[0038] The molding compound protects the internal chip and solder joints from damage caused by external moisture, dust, and mechanical stress. Two molding compounds separate the three conductors, physically preventing incorrect busbar connections. The first hole is located on the side of the first molding compound furthest from the second. The first busbar, passing through the first hole, can bend away from the first molding compound, ensuring that soldering operations on the first busbar are not obstructed by the first molding compound. The third hole is located on the side of the second molding compound furthest from the first. The third busbar, passing through the third hole, can bend away from the second molding compound, ensuring that soldering operations on the third busbar are not obstructed by the second molding compound. The second busbar, passing through the second hole, bends along the width of the photovoltaic junction box, and is not obstructed by the first and second molding compounds on either side in the bending direction, thus facilitating soldering operations on the second busbar.

[0039] As shown in Figure 4, the first encapsulation body has a first extension portion connected to the second conductor, and the first extension portion is located on the side of the second hole away from the second solder portion, extending toward the second encapsulation body. The second encapsulation body has a second extension portion connected to the second conductor, and the second extension portion is located on the side of the second hole away from the second solder portion, extending toward the first encapsulation body.

[0040] During the injection molding of the first molding compound, a first protruding extension is formed on the side near the second conductor. The first extension is located on the side of the second hole away from the second weld, i.e., the side of the second hole near the second edge. The first extension extends toward the second molding compound along the length of the photovoltaic junction box. During the injection molding of the second molding compound, a second extension is formed on the side near the second conductor. The second extension is also located on the side of the second hole away from the second weld. The second extension extends toward the first molding compound along the length of the photovoltaic junction box.

[0041] The first extension and the second extension can exist independently or extend simultaneously relative to each other, with a gap between them. This embodiment illustrates the case where the first extension and the second extension coexist. The first extension and the second extension cover a portion of the second conductor located between the two encapsulated bodies and between the second hole and the second edge. The first extension and the second extension reinforce the structure of the second conductor portion located on the side of the second hole away from the second weld, increasing the contact area and bonding strength between the encapsulation material and the second conductor, thus preventing breakage.

[0042] As shown in Figure 4, a fixing hole is provided on the second conductor. The fixing hole is located between the first and second encapsulation bodies, and the fixing hole is located on the side of the second hole away from the second welding part.

[0043] A fixing hole can be formed on the second conductor using a stamping process. The fixing hole can be a circular through hole or a slotted hole, etc. The fixing hole is located on the exposed area of ​​the second conductor between the first and second molding bodies; exemplarily, the fixing hole is located between the first and second extensions. Specifically, the fixing hole is located on the side of the second hole away from the second welding part, i.e., the fixing hole, the second hole, and the second welding part are arranged sequentially along the width direction of the photovoltaic junction box. When the photovoltaic junction box is installed on the photovoltaic module, fasteners such as screws, rivets, or clips can be passed through the fixing hole to firmly fix the photovoltaic junction box to the backplate or mounting bracket of the photovoltaic module. The design position of this fixing hole allows for separation of the fixing hole from the welding area, avoiding mutual interference between the fixing and welding operations. This ensures that the fastening operation does not interfere with the busbar welding on the second welding part, and utilizes the space between the two molding bodies, eliminating the need to increase the product length and contributing to product miniaturization.

[0044] Along the width direction of the photovoltaic junction box, the width ratio of the first conductor and the second conductor is greater than or equal to 0.8 and less than or equal to 1.2, and the width ratio of the third conductor and the second conductor is also greater than or equal to 0.8 and less than or equal to 1.2. In this embodiment, by making the widths of the first, second, and third conductors equal or nearly equal, it is ensured that the cross-sectional area of ​​any conductor does not change significantly when current flows through it. In the parallel bypass operating mode, the current can pass through each path uniformly, avoiding overheating caused by excessive local resistance.

[0045] As shown in Figure 3, within the plane formed by the length and width directions of the photovoltaic junction box, the cross-sectional shapes of the first conductor, the second conductor, and the third conductor are rectangular.

[0046] The first, second, and third conductors can all be punched from rectangular copper strips. Within the plane defined by the upper and lower surfaces—that is, the plane formed by the length and width directions of the photovoltaic junction box—the outer contour of each conductor can be rectangular. The four corners of the rectangle can be right angles or rounded (as shown in Figure 4) to prevent tip discharge and stress concentration.

[0047] The conductors have a rectangular cross-sectional shape, ensuring that the cross-sectional area of ​​the conductor does not abruptly change or narrow locally as current flows through any conductor. In the parallel bypass operation mode composed of the first and second chips, each conductor exhibits balanced resistance characteristics due to its uniform cross-section. This ensures that the current flows evenly through each parallel path, avoiding sudden increases in current density and abnormal increases in resistance caused by local reductions in cross-sectional area. This uniform current distribution effectively prevents localized overheating on the conductors, reducing power loss and material aging risks caused by overheating, and improving the thermal stability and reliability of the product during long-term operation.

[0048] As shown in Figures 5 and 6, the first conductor has a first protrusion and the second conductor has a first recess. At least a portion of the first protrusion is located in the first recess, and there is a gap between the outer wall surface of the first protrusion and the inner wall surface of the first recess. At least a portion of the first chip is disposed on the first protrusion.

[0049] The first conductor has a first protrusion formed at one end near the second conductor, protruding towards the second conductor. Correspondingly, the second conductor has a first recess formed at one end near the first conductor, matching the shape of the first protrusion. The first recess can be a rectangular notch. The first protrusion is inserted into the area of ​​the first recess, but the two do not contact each other; a uniform gap is maintained between the outer wall surface of the first protrusion and the inner wall surface of the first recess. The first chip is mounted and soldered to the upper surface of the first protrusion.

[0050] The staggered design of the first protrusion and the first recess allows the ends of two adjacent conductors to partially overlap in the width direction of the photovoltaic junction box. This effectively increases the area of ​​the first conductor itself available for chip placement without changing the total length, which is beneficial for improving integration and achieving miniaturization. At the same time, placing the chip on the protrusion brings it closer to the center of the conductor, ensuring a more stable connection.

[0051] In some embodiments, the second conductor has a second protrusion, and the third conductor has a second recess. At least a portion of the second protrusion is located within the second recess, and a gap exists between the outer wall surface of the second protrusion and the inner wall surface of the second recess. At least a portion of the second chip is disposed on the second protrusion. In this embodiment, the second conductor can be stamped to form a second protrusion protruding towards the third conductor at one end near the third conductor. The third conductor forms a second recess at one end near the second conductor. The second protrusion is inserted into the second recess, with a gap between them. The technical effect of the second protrusion cooperating with the first recess is similar to the aforementioned technical effect of the first protrusion and first recess cooperating, and will not be repeated here.

[0052] In this embodiment, the combination structure of the first protrusion and the first recess, as well as the combination structure of the second protrusion and the second recess, allows the first chip and the second chip to be arranged on both sides of the second conductor, so that the area on the second conductor between the first chip and the second chip is unobstructed. This helps to expand the area of ​​the second welding part and the space above it, making the welding operation easier.

[0053] In some embodiments, the mating structure of the first protrusion and the first recess can exist independently, and the second protrusion and the second recess may not be provided. In some embodiments, the mating structure of the second protrusion and the second recess can exist independently, and the first protrusion and the first recess may not be provided.

[0054] As shown in Figure 6, the first, second, and third holes are elongated strips. The first and third holes extend along the width of the photovoltaic junction box, while the second hole extends along the length of the photovoltaic junction box. The first, second, and third holes can all be formed by stamping.

[0055] The elongated first, second, and third holes can be matched with the shape of the flat busbar. When the busbar passes through the first or third hole, it can be bent along the length of the photovoltaic junction box. For example, the busbar exiting from the first hole can be bent away from the first encapsulation, and the busbar exiting from the third hole can be bent away from the second encapsulation. This provides a larger welding space for both the busbars exiting the first and third holes, ensuring unobstructed welding paths, facilitating welding operations, and improving welding quality. The busbar passing through the second hole can be bent along the width of the photovoltaic junction box, ensuring that it is not obstructed by the encapsulation in the welding direction, further facilitating welding operations. This directional guidance allows the busbar to be guided from the perforation position to a predetermined, unobstructed welding area (i.e., the first, second, and third welding sections), thereby obtaining a larger welding space, ensuring unobstructed welding directions, and improving welding quality.

[0056] As shown in Figures 7 and 8, a first chip is disposed on a first conductor and is electrically connected to a second conductor via a first jumper. A second chip is disposed on a second conductor and is electrically connected to a third conductor via a second jumper.

[0057] The first and second jumpers can be metal conductive sheets or wires, or other conductive structures. The first chip can be soldered to a designated position on the upper surface of the first conductor using solder paste. One end of the first jumper is soldered to the upper surface electrode (e.g., cathode) of the first chip, and the other end is soldered to a designated position on the upper surface of the second conductor. The second chip can also be soldered to a designated position on the upper surface of the second conductor using solder paste. One end of the second jumper is soldered to the upper surface electrode (e.g., anode) of the second chip, and the other end is soldered to a designated position on the upper surface of the third conductor. Current can flow into the first conductor, through the first chip, and then through the first jumper to the second conductor, completing a bypass branch. Alternatively, current can flow into the third conductor, through the second jumper to the second chip, and then through the second chip to the second conductor, completing another reverse bypass branch. The jumpers achieve electrical bridging between two points on different conductor planes.

[0058] This application also provides a photovoltaic module, which includes a battery string, a first busbar, a second busbar, a third busbar, and a photovoltaic junction box provided in any embodiment of this application. The battery string is electrically connected to the first busbar, the second busbar, and the third busbar, respectively. For example, the first busbar, the second busbar, and the third busbar can be welded to corresponding positions on the battery string to achieve electrical connection.

[0059] In this configuration, the end of the first busbar furthest from the battery string can pass through the first hole and be welded to the first welded part for fixation and electrical connection. The end of the second busbar furthest from the battery string can pass through the second hole and be welded to the second welded part for fixation and electrical connection. The end of the third busbar furthest from the battery string can pass through the third hole and be welded to the third welded part for fixation and electrical connection.

[0060] The photovoltaic module also possesses the advantages of the photovoltaic junction box mentioned above, so they will not be elaborated here.

[0061] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A photovoltaic junction box, characterized in that, include: A first conductor, wherein a first hole and a first welding part are provided on the first conductor; A second conductor, having a second hole and a second solder joint; a third conductor, having a third hole and a third solder joint; and a first chip, one end of which is electrically connected to the first conductor, and the other end of which is electrically connected to the second conductor. The second chip has one end electrically connected to the third conductor and the other end electrically connected to the second conductor. The first, second, and third conductors are arranged at intervals along the length of the photovoltaic junction box. The first hole is closer to the second conductor than the first welding portion, and the third hole is closer to the second conductor than the third welding portion. Along the width of the photovoltaic junction box, the second conductor includes a first edge and a second edge. The distance between the geometric center of the second hole and the first edge is greater than the distance between the geometric center of the second hole and the second edge. The second welding portion is located between the second hole and the first edge.

2. The photovoltaic junction box according to claim 1, characterized in that, The distance between the geometric center of the second hole and the first edge is h1, and the distance between the geometric center of the second hole and the second edge is h2, where 1 < h1 / h2 ≤ 3.

3. The photovoltaic junction box according to claim 1, characterized in that, It also includes a first molding compound and a second molding compound, the first molding compound being connected to the first conductor and the second conductor, the first conductor and the second conductor being separated by the first molding compound, and the first chip being encapsulated between the first molding compound and the first conductor; The second molding compound is connected to the third conductor and the second conductor, the third conductor and the second conductor are separated by the second molding compound, and the second chip is encapsulated between the second molding compound and the second conductor.

4. The photovoltaic junction box according to claim 3, characterized in that, The first encapsulation body is provided with a first extension portion, the first extension portion is connected to the second conductor, and the first extension portion is located on the side of the second hole away from the second solder portion, the first extension portion extends toward the second encapsulation body; and / or, the second encapsulation body is provided with a second extension portion, the second extension portion is connected to the second conductor, and the second extension portion is located on the side of the second hole away from the second solder portion, the second extension portion extends toward the first encapsulation body.

5. The photovoltaic junction box according to claim 4, characterized in that, The second conductor is provided with a fixing hole, which is located between the first encapsulation body and the second encapsulation body, and the fixing hole is located on the side of the second hole away from the second welding part.

6. The photovoltaic junction box according to any one of claims 1-5, characterized in that, Along the width direction of the photovoltaic junction box, the width ratio of the first conductor to the second conductor is greater than or equal to 0.8 and less than or equal to 1.2, and the width ratio of the third conductor to the second conductor is greater than or equal to 0.8 and less than or equal to 1.

2.

7. The photovoltaic junction box according to claim 6, characterized in that, Within the plane formed by the length and width directions of the photovoltaic junction box, the cross-sectional shapes of the first conductor, the second conductor, and the third conductor are rectangular.

8. The photovoltaic junction box according to claim 7, characterized in that, The first conductor has a first protrusion, the second conductor has a first recess, at least a portion of the first protrusion is located in the first recess, and there is a gap between the outer wall surface of the first protrusion and the inner wall surface of the first recess, and at least a portion of the first chip is disposed on the first protrusion; and / or, the second conductor has a second protrusion, the third conductor has a second recess, at least a portion of the second protrusion is located in the second recess, and there is a gap between the outer wall surface of the second protrusion and the inner wall surface of the second recess, and at least a portion of the second chip is disposed on the second protrusion.

9. The photovoltaic junction box according to claim 1, characterized in that, The first hole, the second hole, and the third hole are elongated. The first hole and the third hole extend along the width direction of the photovoltaic junction box, and the second hole extends along the length direction of the photovoltaic junction box.

10. The photovoltaic junction box according to claim 1, characterized in that, The first chip is disposed on the first conductor and is electrically connected to the second conductor via a first jumper; the second chip is disposed on the second conductor and is electrically connected to the third conductor via a second jumper.

11. A photovoltaic module, characterized in that, The device includes a battery string, a first busbar, a second busbar, a third busbar, and a photovoltaic junction box as described in any one of claims 1-10; the battery string is electrically connected to the first busbar, the second busbar, and the third busbar respectively; the first busbar passes through the first hole and is electrically connected to the first welded part; the second busbar passes through the second hole and is electrically connected to the second welded part; the third busbar passes through the third hole and is electrically connected to the third welded part.

Images