Conductive connector, solar cell string, and photovoltaic module

Abstract

This application relates to a conductive connector, a solar cell string, and a photovoltaic module. The conductive connector includes a first main segment, an overlapping segment, and a second main segment connected sequentially. The first main segment is connected to the front side of a preceding solar cell, and the second main segment is connected to the back side of a following solar cell. The first main segment contains a first core material, the second main segment contains a second core material, and the overlapping segment contains stacked third and fourth core materials. The first core material has a first cross-sectional shape, the second core material has a second cross-sectional shape, the third core material has a third cross-sectional shape, and the fourth core material has a fourth cross-sectional shape, wherein the first, second, third, and fourth cross-sectional shapes are all different. This improves the utilization rate of sunlight, thereby increasing the power of the photovoltaic module and enhancing its reliability. It also facilitates the forming and conductive connection of the first and second main segments.

Description

Technical Field

[0001] This application relates to the field of solar cell technology, and in particular to a conductive connector, solar cell string, and photovoltaic module. Background Technology

[0002] Photovoltaic modules are the most important part of a photovoltaic power generation system. Their function is to convert solar energy into electrical energy to power loads. The basic unit of a photovoltaic module is the solar cell, which is connected in series by solder ribbons. A single solar cell string cannot be used directly as a power source; several individual solar cell strings must be connected in parallel and tightly sealed to form a photovoltaic module.

[0003] As the market penetration rate of bifacial photovoltaic modules rapidly increases, the performance of its core component, the interconnecting ribbon, needs to match the demands of bifacial power generation. Currently, a circular ribbon is used to connect the front and back of adjacent cells; that is, a circular welding wire connects the front of one cell to the back of the next. However, this cannot meet the ever-increasing power requirements of photovoltaic modules. Utility Model Content

[0004] Therefore, it is necessary to address the issue that the current practice of using a circular solder strip to connect the front and back of adjacent solar cells affects the power output of photovoltaic modules. A conductive connector, solar cell string, and photovoltaic module should be provided that can avoid increasing the power output of the photovoltaic module and ensure the product quality of the solar cell string.

[0005] A conductive connector includes a first main body segment, an overlapping segment, and a second main body segment connected in sequence. The first main body segment is connected to the front side of a preceding battery cell, and the second main body segment is connected to the back side of a following battery cell.

[0006] The first main body segment has a first core material, the second main body segment has a second core material, and the overlapping segment has a third core material and a fourth core material stacked together.

[0007] The first core material has a first cross-sectional shape, the second core material has a second cross-sectional shape, the third core material has a third cross-sectional shape, and the fourth core material has a fourth cross-sectional shape, wherein the first cross-sectional shape, the second cross-sectional shape, the third cross-sectional shape, and the fourth cross-sectional shape are all different from each other.

[0008] In one embodiment of this application, the first cross-sectional shape is a triangle or a triangle with a transitional chamfer;

[0009] The second cross-section is circular;

[0010] The third cross-sectional shape is the shape that the first cross-sectional shape is flattened.

[0011] The fourth cross-sectional shape is the shape that the second cross-sectional shape becomes after being flattened.

[0012] In one embodiment of this application, the third cross-sectional shape and the fourth cross-sectional shape are flat.

[0013] In one embodiment of this application, the aspect ratio of the third core material is in the range of 8 to 12;

[0014] And / or, the aspect ratio of the fourth core material is in the range of 8 to 12.

[0015] In one embodiment of this application, along the thickness direction, the width of the lower core material in the overlapping segment is greater than the width of the upper core material;

[0016] And / or, the dimension of the overlapping segment along the length direction is greater than or equal to 0.5 mm;

[0017] And / or, the dimension of the overlapping segment along the thickness direction is less than 0.15 mm;

[0018] And / or, the overlapping segment is separated from the front metal electrode of the preceding cell and / or the back metal electrode of the following cell.

[0019] In one embodiment of this application, the first core material, the second core material, the third core material, and the fourth core material are made of copper substrate.

[0020] In one embodiment of this application, the overlapping segment further includes a covering layer that covers the outer periphery of the third core material and the fourth core material.

[0021] In one embodiment of this application, the covering layer includes a first covering body and a second covering body. The first covering body covers a portion of the outer periphery of the third core material, and the second covering body covers a portion of the outer periphery of the fourth core material. The first covering body and the second covering body are connected at the layering point of the third core material and the fourth core material.

[0022] In one embodiment of this application, the covering layer includes a reflective layer, which covers the outer periphery of the third core material and the fourth core material;

[0023] Alternatively, the coating layer includes a first solder layer and a reflective layer, wherein the first solder layer covers the outer periphery of the third core material and the fourth core material, and the reflective layer covers the outer periphery of the first solder layer; or, the first solder layer and the reflective layer cover the outer periphery of the third core material and the fourth core material.

[0024] Alternatively, the cladding layer may include a first solder layer that covers the outer periphery of the third core material and the fourth core material.

[0025] In one embodiment of this application, the overlapping section further includes a second solder layer, and there is a gap between the third core material and the fourth core material along the thickness direction. The second solder layer is disposed in the gap to connect the third core material and the fourth core material.

[0026] In one embodiment of this application, the second solder layer is used to weld the third core material and the fourth core material together, so that the third core material and the fourth core material are independent of each other;

[0027] Alternatively, the second solder layer fuses the third core material and the fourth core material together, thereby partially fusing the third core material and the fourth core material;

[0028] Alternatively, the second solder layer fuses the third core material, the fourth core material, and the cladding layer together, so that the third core material, the fourth core material, and the cladding layer are fused into one.

[0029] In one embodiment of this application, the coating layer further includes a first solder layer, which includes a tin-lead alloy, a tin-lead-bismuth alloy, or a tin-silver alloy.

[0030] And / or, the coating layer further includes a reflective layer, the reflective layer comprising a silver coating or an aluminum coating;

[0031] And / or, the overlapping segment further includes a second solder layer, the second solder layer comprising a tin-lead alloy, a tin-lead-bismuth alloy, or a tin-silver alloy.

[0032] In one embodiment of this application, the first main body segment further includes a first welding coating and a reflective coating. The first welding coating and the reflective coating cover the outer periphery of the first core material. The first welding coating is located on the surface of the first core material facing the preceding battery cell, and the reflective coating is located on the surface of the first core material away from the preceding battery cell.

[0033] And / or, the second body segment further includes a second welding coating, which covers the outer periphery of the second core material.

[0034] A solar cell string includes multiple solar cells and multiple conductive connectors as described in any of the above technical features;

[0035] Multiple solar cells are arranged along the length direction, and the conductive connector conductively connects the front side of the preceding solar cell to the back side of the following solar cell.

[0036] In one embodiment of this application, the overlapping segment is located on the back side of the subsequent battery cell, and / or the overlapping segment is located on the front side of the preceding battery cell;

[0037] When the overlapping segment is located on the front side of the preceding battery and the back side of the following battery cell, the length of the overlapping segment on the back side of the following battery cell is greater than the length of the overlapping segment on the front side of the preceding battery cell.

[0038] A photovoltaic module includes at least a cover plate, a back sheet, and a plurality of solar cell strings as described in any of the above technical features;

[0039] Multiple solar cell strings are connected in parallel and / or in series. The cover plate and the back plate are disposed on both sides of the multiple solar cell strings, and the cover plate, the multiple solar cell strings and the back plate are encapsulated to form the photovoltaic module.

[0040] By adopting the above technical solution, this application has at least the following technical effects:

[0041] The conductive connector, solar cell string, and photovoltaic module of this application have an overlapping section between a first main body segment and a second main body segment. The first main body segment is connected to the front side of the preceding solar cell, and the second main body segment is connected to the back side of the following solar cell, so that the conductive connector connects the preceding and following solar cells. Because the first cross-sectional shape of the first core material in the first main body segment is different from the second cross-sectional shape of the second core material in the second main body segment, the first main body segment can reflect sunlight on the front side of the preceding solar cell, and the second main body segment can reduce the shading area on the back side of the following solar cell, thereby improving the utilization rate of sunlight and thus increasing the power of the photovoltaic module and improving the reliability of the photovoltaic module. At the same time, the third cross-sectional shape of the third core material stacked in the overlapping section is different from the cross-sectional shape of the fourth core material, which facilitates the forming and conductive connection of the first and second main body segments. Attached Figure Description

[0042] Figure 1 This is a schematic diagram of a conductive connector according to an embodiment of this application.

[0043] Figure 2 for Figure 1 The diagram shown illustrates the application of conductive connectors to a solar cell string from one perspective.

[0044] Figure 3 for Figure 2 The diagram shows a solar cell string from another perspective.

[0045] Figure 4 for Figure 1 The disconnected front view of the solar cell string is shown.

[0046] Figure 5 for Figure 4 The diagram shows a partial view of the solar cell string at point A.

[0047] Figure 6 for Figure 1 The front view showing the disconnected conductive connector.

[0048] Figure 7 for Figure 6 A partial schematic diagram of the conductive connector at point B is shown.

[0049] Figure 8 for Figure 1 The diagram shows a partial overlapping section in the first main body segment of the conductive connector.

[0050] Figure 9 for Figure 1 A partial schematic diagram of the second main body segment of the conductive connector shown, which has a partially overlapping segment.

[0051] Figure 10 for Figure 6 The diagram shows a conductive connector cut in the overlapping section.

[0052] Figure 11 for Figure 6 The conductive connector shown is a cross-sectional view at CC.

[0053] Figure 12 for Figure 11 The deformation diagram of the first main body section shown.

[0054] Figure 13 for Figure 6 The conductive connector shown is a cross-sectional view at DD.

[0055] Figure 14 This is a schematic diagram of the combination of the first main body paragraph and the second main body paragraph.

[0056] Figure 15 for Figure 10 The first deformation diagram shown is the overlapping segment cut open.

[0057] Figure 16 for Figure 10 The second deformation diagram shown is the overlapping segment cut open.

[0058] Wherein: 100, solar cell string; 100, conductive connector; 110, first main body segment; 111, first core material; 112, first welding coating; 113, reflective coating; 120, second main body segment; 121, second core material; 122, second welding coating; 130, overlapping segment; 131, third core material; 132, fourth core material; 133, cladding layer; 1331, first cladding body; 1332, second cladding body; 134, second solder layer; 200, previous solar cell; 300, next solar cell. Detailed Implementation

[0059] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0060] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0061] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0062] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0063] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact, or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0064] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0065] Understandably, current photovoltaic modules use a circular solder strip to connect the front and back of adjacent cells; that is, a circular solder wire connects the front of one cell to the back of the next. However, this cannot meet the ever-increasing power demands of photovoltaic modules.

[0066] For this purpose, please refer to Figures 1 to 3 This application provides a conductive connector 100. The conductive connector 100 is used in the solar cell string 10 of a photovoltaic module. Figure 1 This is a schematic diagram of a conductive connector 100 according to an embodiment of this application. Figure 2 for Figure 1 The schematic diagram shown illustrates the application of the conductive connector 100 to the solar cell string 10 from one perspective. Figure 3 for Figure 2 A schematic diagram of the solar cell string 10 shown from another perspective.

[0067] To better illustrate the structure of the conductive connector 100, the structure of the photovoltaic module and the solar cell string 10 is briefly described below. The photovoltaic module includes at least a cover plate (not shown), a back sheet (not shown), and multiple solar cell strings 10 as described in this application. These multiple solar cell strings 10 are connected in series and / or in parallel and are disposed between the cover plate and the back sheet, which protect the multiple solar cell strings 10. Furthermore, sunlight (rays) passes through the cover plate and enters the surface of the multiple solar cell strings 10, allowing the solar cell strings 10 to generate charge carriers using the photovoltaic principle to output current.

[0068] See Figures 1 to 5 In one embodiment, the solar cell string 10 includes a plurality of solar cells and a plurality of conductive connectors 100 of this application. The plurality of solar cells are arranged sequentially along the length direction and are welded together by the plurality of conductive connectors 100. Figure 4 for Figure 1 The disconnected front view of the solar cell string 10 shown. Figure 5 for Figure 4 The diagram shows a partial view of the solar cell string 10 at point A. It is worth noting that the structure and principle of the conductive connector 100 connecting two adjacent solar cells are essentially the same as the structure and principle of the conductive connector 100 connecting the remaining solar cells. This application only uses the example of the conductive connector 100 connecting two adjacent solar cells for illustration.

[0069] like Figures 1 to 3 As shown, the extension direction of the conductive connector 100 is the length direction, which is also the arrangement direction of multiple solar cells. The length direction perpendicular to the solar cell is the width direction of the cell, and the thickness direction of the solar cell is the thickness direction, which is also the up-down direction and the top-bottom direction. The length direction, width direction and thickness direction are not shown in the figure.

[0070] Figures 2 to 5 The diagram shows a conductive connector 100 in a solar cell string 10 connecting two solar cells. For ease of description, it is referred to as... Figures 2 to 5 The solar cell on the left is the front cell 200, and the solar cell on the right is the back cell 300. The surface of the solar cell facing the sunlight is the front side of the solar cell, and the surface of the solar cell away from the sunlight is the back side of the solar cell.

[0071] The conductive connector 100 can be connected to the front side of the preceding solar cell 200 and also to the back side of the following solar cell 300, so as to connect adjacent preceding solar cells 200 and following solar cells 300 in series. Furthermore, the connection method between the following solar cell 300 and the next solar cell is the same as the connection method between the preceding solar cell 200 and the following solar cell 300. This process is repeated to connect multiple solar cells in series to form a solar cell string 10.

[0072] The conductive connector 100 is a conductive component. After the conductive connector 100 connects the front battery cell 200 and the rear battery cell 300 in series, the conductive connector 100 can connect the current of the front battery cell 200 and the rear battery cell 300 in series, and then conduct the current so that the current generated by the front battery cell 200 and the rear battery cell 300 under light is transmitted to the external circuit through the conductive connector 100 to realize the output of current.

[0073] The conductive connector 100 of this application can reflect sunlight from the front of the preceding solar cell 200 and reduce the shading area on the back of the following solar cell 300, thereby improving the utilization rate of sunlight and thus increasing the power of the photovoltaic module and improving the reliability of the photovoltaic module. At the same time, it facilitates the forming and conductive connection of the conductive connector 100. The specific structure of the conductive connector 100 in some embodiments is described below.

[0074] See Figures 1 to 10 In one embodiment, the conductive connector 100 includes a first main body segment 110, an overlapping segment 130, and a second main body segment 120 connected in sequence. The first main body segment 110 is connected to the front side of the preceding battery cell 200, and the second main body segment 120 is connected to the back side of the following battery cell 300. The first main body segment 110 has a first core material 111, the second main body segment 120 has a second core material 121, and the overlapping segment 130 has a third core material 131 and a fourth core material 132 stacked together. The first core material 111 has a first cross-sectional shape, the second core material 121 has a second cross-sectional shape, the third core material 131 has a third cross-sectional shape, and the fourth core material 132 has a fourth cross-sectional shape.

[0075] The shapes of the first, second, third, and fourth cross sections are all different. Figure 6 for Figure 1 The disconnected front view of the conductive connector 100 is shown. Figure 7 for Figure 6 The diagram shows a partial view of the conductive connector 100 at point B. Figure 8 for Figure 1 The diagram shows a partial view of the first main body segment 110 of the conductive connector 100, which has an overlapping segment 130. Figure 9 for Figure 1 The diagram shows a partial overlapping section 130 in the second main body segment 120 of the conductive connector 100. Figure 10 for Figure 6 The schematic diagram shown is of the conductive connector 100 cut in the overlapping section 130, and no cross-sectional lines are provided in the cut schematic diagram.

[0076] The first main body segment 110 and the second main body segment 120 extend along the length direction. The first main body segment 110 is disposed on the front side of the preceding battery cell 200 and is used to collect the current of the preceding battery cell 200. The second main body segment 120 is disposed on the back side of the following battery cell 300 and is used to collect the current of the following battery cell 300. Moreover, the first main body segment 110 and the second main body segment 120 are connected by an overlapping segment 130 to connect the preceding battery cell 200 and the following battery cell 300 in series, thereby realizing the collection and output of current.

[0077] The first main body segment 110 has a first core material 111. The first main body segment 110 is disposed on the front side of the preceding battery cell 200, and the first main body segment 110 collects the current of the preceding battery cell 200 through the first core material 111. The second main body segment 120 has a second core material 121. The second main body segment 120 is disposed on the front side of the following battery cell 300, and the second main body segment 120 collects the current of the following battery cell 300 through the second core material 121. The overlapping segment 130 has a third core material 131 and a fourth core material 132 stacked together. The first core material 111 is electrically connected to the third core material 131, the third core material 131 is electrically connected to the fourth core material 132, and the fourth core material 132 is electrically connected to the second core material 121. In this way, the first core material 111 in the first main body segment 110 and the second core material 121 in the second main body segment 120 can be electrically connected to connect the first battery cell 200 and the second battery cell 300 in series, so as to realize the collection and output of current.

[0078] Furthermore, the first core material 111 has a first cross-sectional shape (here, the cross-section refers to the surface along the thickness direction, which will not be described again later), the second core material 121 has a second cross-sectional shape, the third core material 131 has a third cross-sectional shape, and the fourth core material 132 has a fourth cross-sectional shape. Among them, the first cross-sectional shape, the second cross-sectional shape, the third cross-sectional shape, and the fourth cross-sectional shape are all different from each other.

[0079] When sunlight shines on the first main body section 110, the surface of the first main body section 110 facing away from the preceding solar cell 200 can reflect the sunlight to the back of the cover plate, and then the cover plate can reflect the sunlight to the front of the preceding solar cell 200. In this way, the sunlight reflected by the first main body section 110 can be reflected to the front of the preceding solar cell 200, thereby improving the utilization rate of sunlight and thus increasing the power of the photovoltaic module.

[0080] The second main body section 120 can also reflect some sunlight to the back sheet, and then reflect it to the back of the next solar cell 300. In this way, the next solar cell 300 can also utilize the sunlight reflected by the second main body section 120 to further improve the utilization rate of sunlight and thus increase the power of the photovoltaic module.

[0081] Furthermore, since the first cross-sectional shape of the first core material 111 in the first main body segment 110 is different from the second cross-sectional shape of the second core material 121 in the second main body segment 120, the first main body segment 110 can fully reflect sunlight on the front side of the preceding cell 200, and the second main body segment 120 can reduce the shading area on the back side of the following cell 300, so as to ensure that the back side of the following cell 300 is exposed to sunlight, thereby improving the utilization rate of sunlight and increasing the power of the photovoltaic module.

[0082] Meanwhile, the third cross-sectional shape of the third core material 131 in the overlapping section 130 is different from the fourth cross-sectional shape of the fourth core material 132, and the third and fourth cross-sectional shapes are also different from the first and second cross-sectional shapes. This facilitates the connection of the first main body section 110 and the second main body section 120 in the overlapping section 130, facilitates the forming of the conductive connector 100, and realizes the electrical connection between the first main body section 110 and the second main body section 120.

[0083] In the conductive connector 100 of the above embodiment, because the first cross-sectional shape of the first core material 111 in the first main body segment 110 is different from the second cross-sectional shape of the second core material 121 in the second main body segment 120, the first main body segment 110 can reflect sunlight on the front side of the preceding solar cell 200, and the second main body segment 120 can reduce the shading area on the back side of the following solar cell 300, thereby improving the utilization rate of sunlight and thus increasing the power of the photovoltaic module and improving the reliability of the photovoltaic module. At the same time, the third cross-sectional shape of the third core material 131 stacked in the overlapping segment 130 is different from the cross-sectional shape of the fourth core material 132, which facilitates the forming and conductive connection of the first main body segment 110 and the second main body segment 120.

[0084] See Figures 6 to 9 In one embodiment, a third core material 131 is disposed at one end of a first core material 111, and a fourth core material 132 is disposed at one end of a second core material 121. The third core material 131 and the fourth core material 132 are stacked to form an overlapping segment 130. Thus, the third core material 131 is electrically connected to the first core material 111, and the second core material 121 is electrically connected to the fourth core material 132. The stacked and electrically connected third core material 131 and the fourth core material 132 electrically connect the first main body segment 110 and the second main body segment 120.

[0085] See Figures 6 to 10 In one embodiment, the third and fourth cross-sectional shapes are flat. That is, the third core material 131 and the fourth core material 132 are flat, and the flat third core material 131 and the flat fourth core material 132 are stacked and connected to form a flat overlapping section 130. This reduces the dimension of the overlapping section 130 along the thickness direction, thereby reducing the dimension of the solar cell string 10 along the thickness direction and thus reducing the overall thickness of the photovoltaic module. Simultaneously, the flat overlapping section 130 also reduces the gap between the preceding solar cell 200 and the following solar cell 300, allowing for a greater number of solar cells to be placed within a limited space, thus improving the efficiency of the photovoltaic module.

[0086] See Figures 6 to 14 In one embodiment, the first cross-sectional shape is a triangle or a triangle with a transition chamfer, the second cross-sectional shape is a circle, the third cross-sectional shape is the shape presented by flattening the first cross-sectional shape, and the fourth cross-sectional shape is the shape presented by flattening the second cross-sectional shape. Figure 11 for Figure 6 The conductive connector 100 shown is a cross-sectional view at CC. Figure 12 for Figure 11 The deformation diagram of the first main body segment 110 section shown is as follows. Figure 13 for Figure 6 The conductive connector 100 shown is a cross-sectional view at DD. Figure 14 This is a schematic diagram of the combination of the first main body segment 110 and the second main body segment 120.

[0087] The first cross-sectional shape is triangular, meaning the cross-sectional shape of the first core material 111 is triangular, and the cross-sectional shape of the first main body segment 110 is also triangular. Here, we will only refer to the first main body segment 110 instead of the first core material 111. The triangular first cross-sectional shape, when flattened, presents a trapezoidal third cross-sectional shape. The second cross-sectional shape is circular, meaning the cross-sectional shape of the second core material 121 is circular, and the cross-sectional shape of the second main body segment 120 is also circular. Here, we will only refer to the second main body segment 120 instead of the second core material 121. The circular second cross-sectional shape, when flattened, presents an elliptical fourth cross-sectional shape. The trapezoidal third cross-sectional shape and the elliptical fourth cross-sectional shape are stacked to form the overlapping segment 130.

[0088] The first main body segment 110, with a triangular cross-section, reduces the light-blocking area of ​​the front side of the preceding solar cell 200 after connecting with the front side of the preceding solar cell 200, thereby increasing the light-receiving area of ​​the preceding solar cell 200. Simultaneously, the first main body segment 110, with its triangular cross-section, has two reflective surfaces, ensuring reflectivity and improving the utilization rate of sunlight. Figure 11 In the first main segment 110, the edges of the triangles are all sharp angles. Figure 12 In the first main body segment 110, the edges of the triangles are connected by chamfering to reduce the manufacturing difficulty of the first main body segment 110.

[0089] The circular cross-section of the second main body segment 120, after being connected to the back of the subsequent solar cell 300, reduces the shading area of ​​the second main body segment 120 on the back of the subsequent solar cell 300. After sunlight is reflected by the ground or other surfaces onto the back of the subsequent solar cell 300, the circular second main body segment 120 reduces the space it occupies on the back of the subsequent solar cell 300.

[0090] See Figure 11 and Figure 12In one embodiment, the side length of the first main body segment 110 ranges from 0.1mm to 0.35mm. That is, the cross-section of the first main body segment 110 is triangular, with the side length of the triangle within the range of 0.1mm to 0.35mm. This reduces resistance, lowers current transmission loss, reduces the shading area, and improves the utilization rate of sunlight. Simultaneously, it ensures the mechanical strength of the first main body segment 110 and improves the reliability of its connection with the preceding solar cell 200.

[0091] See Figure 13 In one embodiment, the diameter of the second main body segment 120 ranges from 0.1 mm to 0.3 mm. Having the diameter of the second main body segment 120 within this range reduces resistance, lowers current transmission loss, reduces the shading area, and improves the utilization rate of sunlight. Simultaneously, it ensures the mechanical strength of the second main body segment 120 and improves the reliability of its connection with the subsequent battery cell 300.

[0092] Understandably, after the first main body segment 110 and the second main body segment 120 are connected by the overlapping segment 130 to form the conductive connector 100, there is partial overlap between the first main body segment 110 and the second main body segment 120 in the side view of the photoconductive connector 100. To facilitate the explanation of the combination of the cross-sectional shapes of the first main body segment 110 and the second main body segment 120, the first main body segment 110 and the second main body segment 120 are arranged offset along the thickness direction, and the cross-sections of the first main body segment 110 and the second main body segment 120 are combined together.

[0093] like Figure 14 As shown, the first main body segment 110 has a triangular cross-sectional shape, and the second main body segment 120 has a circular cross-sectional shape. The triangular first main body segment 110 is connected to the front of the preceding battery cell 200, and the circular second main body segment 120 is connected to the back of the following battery cell 300.

[0094] Understandably, by using a first main body segment 110 with a triangular cross-section to connect the front of the previous solar cell 200 and a second main body segment 120 with a circular cross-section to connect the back of the next solar cell 300, the first main body segment 110 can reflect sunlight and improve the utilization rate of sunlight, while the second main body segment 120 can reduce the shading area on the back of the next solar cell 300, thereby increasing the power of the photovoltaic module.

[0095] Moreover, the first main body segment 110 and the second main body segment 120 are easy to manufacture and convenient to form and process. The first main body segment 110 and the second main body segment 120 can be connected to the previous solar cell 200 and the next solar cell 300 respectively, or they can be connected to the previous solar cell 200 and the next solar cell 300 after forming an integral conductive connector 100, thereby reducing the risk of hot spots and reducing the production cost of photovoltaic modules.

[0096] When manufacturing the first main body segment 110 and the third core material 131, a wire with a uniform cross-sectional shape (the cross-section here refers to the surface cut along the thickness direction, which will not be elaborated further below) is used. The wire is cut to a specified length, which matches the length of the first main body segment 110 and the overlapping segment 130. One end of the wire is flattened to form the third core material 131, while the remaining part of the wire retains its original shape, which is the first main body segment 110. The second main body segment 120 and the fourth core material 132 are manufactured in the same way.

[0097] Understandably, the third core material 131 and the fourth core material 132 have a flat structure. During the forming process, the two filaments can be flattened first to form the flat third core material 131 and the fourth core material 132, and then connected together to form a flat overlapping section 130. Alternatively, the two filaments can be connected together first and then flattened to form the flat overlapping section 130. Of course, the two filaments can also be flattened, connected together, and then flattened to form the flat overlapping section 130.

[0098] See Figures 5 to 10 In one embodiment, the aspect ratio of the third core material 131 ranges from 8 to 12. The width refers to the dimension along the width direction of the entire solar cell string 10, i.e. Figure 10 The dimensions shown refer to the left and right directions, while the height refers to the thickness direction of the conductive connector 100. Figure 10 The dimensions in the vertical direction are shown. That is, the ratio of the width to the height of the flattened third core material 131 is between 8 and 12. The width of the third core material 131 refers to its maximum width, and the height of the third core material 131 refers to its maximum height. This reduces the height of the overlapping section 130 and increases the connection area between the third core material 131 and the fourth core material 132, ensuring the reliability of the connection of the overlapping section 130.

[0099] See Figures 5 to 10 In one embodiment, the aspect ratio of the fourth core material 132 is in the range of 8 to 12. That is, the ratio of the width to the height of the flattened fourth core material 132 is in the range of 8 to 12. The width dimension of the fourth core material 132 refers to its maximum dimension in the width direction, and the height dimension of the fourth core material 132 refers to its maximum dimension in the height direction. This reduces the height of the overlapping section 130 and increases the connection area between the third core material 131 and the fourth core material 132, ensuring the reliability of the connection between the overlapping section 130.

[0100] See Figures 4 to 7In one embodiment, the overlap dimension of the overlapping segment 130 along its length direction is greater than or equal to 0.5 mm. This ensures that the overlapping segment 130 has a certain connection length, thereby improving the reliability of the connection between the first main body segment 110 and the second main body segment 120. At the same time, it also ensures the tensile strength between the first main body segment 110 and the second main body segment 120 and guarantees the conductivity of the conductive connector 100.

[0101] See Figures 4 to 7 In one embodiment, the overlap segment 130 has a thickness dimension of less than 0.15 mm. This prevents the overlap segment 130 from protruding beyond the first main body segment 110 and the second main body segment 120, thus avoiding excessive space occupation and preventing the overlap segment 130 from lifting the subsequent solar cell 300. This, in turn, prevents cell cracking during photovoltaic module lamination and ensures the product quality of the photovoltaic module.

[0102] See Figures 4 to 7 In one embodiment, the overlapping segment 130 is separated from the front metal electrode of the preceding battery cell 200 and / or the back metal electrode of the following battery cell 300. In this embodiment, the overlapping segment 130 is located on the back of the following battery cell 300, and there is no conductive connection between the overlapping segment 130 and the following battery cell 300. That is, the overlapping segment 130 can contact the back of the following battery cell 300, but is not welded to the back metal electrode.

[0103] See Figure 10 In this embodiment, the third core material 131 is stacked on top of the fourth core material 132 in the thickness direction. In other embodiments of this application, the fourth core material 132 may also be stacked on top of the third core material 131 in the thickness direction.

[0104] See Figure 10 Along the thickness direction, the width of the lower core material in the overlapping section 130 is greater than the width of the upper core material. This facilitates the alignment and overlap of the third and fourth core materials, reducing the manufacturing difficulty of the conductive connector 100.

[0105] In this embodiment, the third core material 131 is located above the fourth core material 132, and the width of the fourth core material 132 is greater than the width of the third core material 131. Of course, in other embodiments of this application, the fourth core material 132 may also be located above the third core material 131, and the width of the third core material 131 may be greater than the width of the fourth core material 132.

[0106] See Figure 8 , Figure 11 , Figure 12 and Figure 14In one embodiment, the first main body segment 110 further includes a first welding coating 112 and a reflective coating 113, which cover the outer periphery of the first core material 111. The first welding coating 112 is located on the surface of the first core material 111 facing the previous battery cell 200, and the reflective coating 113 is located on the surface of the first core material 111 away from the previous battery cell 200.

[0107] The first welding coating 112 and the reflective coating 113 form the outer surface of the first main body segment 110. The first welding coating 112 and the reflective coating 113 cover the outer periphery of the first core material 111. The first welding coating 112 is located on the lower surface of the first core material 111 and faces the front of the preceding battery cell 200. The reflective coating 113 is located on the upper surface of the first core material 111 and faces away from the front of the preceding battery cell 200. The first welding coating 112 serves as a welding flux, and the reflective coating 113 reflects sunlight.

[0108] When the first main body segment 110 is welded to the front side of the preceding solar cell 200, the first main body segment 110 can be welded to the preceding solar cell 200 through the first welding coating 112, so as to facilitate the welding of the first main body segment 110 to the front side of the preceding solar cell 200 and ensure the reliability of the welding connection between the first main body segment 110 and the preceding solar cell 200, thereby realizing the electrical connection between the first core material 111 and the preceding solar cell 200. The first main body segment 110 can reflect sunlight through the reflective coating 113 to improve the utilization rate of sunlight.

[0109] In one embodiment, a first welding coating 112 covers the outer wall of the first core material 111, and a reflective coating 113 is disposed on a portion of the outer wall of the first welding coating 112. Thus, the reflective coating 113 reflects sunlight, and the surface of the first welding coating 112 exposed to the reflective coating 113 is welded to the front side of the preceding battery cell 200. Therefore, when the first main body segment 110 is welded to the front side of the preceding battery cell 200, the reflective coating 113 is not between the first main body segment 110 and the preceding battery cell 200, thereby not affecting the welding effect between the first main body segment 110 and the preceding battery cell 200, ensuring the reliability of the connection between the first main body segment 110 and the preceding battery cell 200.

[0110] Alternatively, the first welding coating 112 and the reflective coating 113 can be respectively disposed on the outer wall of the first core material 111, and the first welding coating 112 and the reflective coating 113 can be disposed separately. That is to say, the reflective coating 113 is not disposed on the outer wall of the first welding coating 112. In this way, the reliability of the connection between the first main body segment 110 and the previous battery cell 200 can be guaranteed while ensuring the reflective effect.

[0111] See Figure 9 , Figure 13 and Figure 14In one embodiment, the second main body segment 120 further includes a second welding coating 122, which covers the outer periphery of the second core material 121. The second welding coating 122 is the outer surface of the second main body segment 120 and covers the outer periphery of the second core material 121.

[0112] The second welding coating 122 can act as a welding flux. When the second main body segment 120 is welded to the back of the subsequent battery cell 300, the second main body segment 120 can be welded to the subsequent battery cell 300 by the second welding coating 122, so that the second main body segment 120 can be welded to the back of the subsequent battery cell 300, and the reliability of the welding connection between the second main body segment 120 and the subsequent battery cell 300 can be guaranteed, thereby realizing the electrical connection between the second core material 121 and the subsequent battery cell 300.

[0113] Understandably, the material of the first welding coating 112 is not limited in principle, as long as it can act as a flux to facilitate the welding connection between the first main body segment 110 and the front side of the preceding battery cell 200. In one embodiment, the first welding coating 112 includes a tin-lead alloy coating, a tin-lead-bismuth alloy coating, or a tin-silver alloy coating, etc. Thus, the first welding coating 112 does not contain the elements of the reflective coating 113, that is, it does not contain silver or aluminum. Of course, the tin-lead alloy coating may also include other trace elements, such as antimony, etc.

[0114] Understandably, the material of the reflective coating 113 is not limited in principle, as long as the reflective coating 113 can reflect sunlight. In one embodiment, the reflective coating 113 includes a silver coating or an aluminum coating, etc.

[0115] Understandably, the material of the second welding coating 122 is not limited in principle, as long as the second welding coating 122 can serve as a flux to facilitate welding between the second main body segment 120 and the back of the subsequent battery cell 300. In one embodiment, the second welding coating 122 includes a tin-lead alloy coating, a tin-lead-bismuth alloy coating, or a tin-silver alloy coating, etc. Of course, the tin-lead alloy coating may also include other trace elements, such as antimony, etc.

[0116] Thus, when the second main body segment 120 is connected to the back of the subsequent battery cell 300, the second welding coating 122 facilitates the welding connection between the second main body segment 120 and the subsequent battery cell 300, ensuring a good connection effect. Simultaneously, the surface of the second main body segment 120 facing away from the subsequent battery cell 300 can also reflect a certain amount of sunlight, thereby improving the utilization rate of sunlight. Alternatively, a reflective coating 113 can be applied to the surface of the second main body segment 120 facing away from the subsequent battery cell 300 to further enhance the reflection effect of sunlight.

[0117] The purpose of the reflective coating 113 is to increase reflectivity and improve the utilization rate of sunlight by the solar cells. In traditional methods, a single solder ribbon is used to connect one solar cell to the next, with reflective coatings on both sides. During ribbon preparation, a tin layer must first be formed on the surface of the copper core, and then the reflective layer is deposited on top of that tin layer. Thus, after the solder ribbon is flattened, on the front side of the first solar cell, the lower surface of the solder ribbon will have a reflective surface facing away from the front side, allowing for a reliable connection. However, on the back side of the second solar cell, the upper surface of the solder ribbon will have a reflective surface facing away from the back side. When the solder ribbon is connected to the back side of the second solar cell, the reflective surface will connect with the back side, affecting welding performance.

[0118] Therefore, the conductive connector 100 of this application adopts a segmented design structure, with the first main body segment 110 and the second main body segment 120 being independently set and connected by an overlapping segment 130. In this way, the independent first main body segment 110 and second main body segment 120 can be set according to actual needs, so that the first main body segment 110 and the second main body segment 120 can exhibit different optical and electrical properties to adapt to the front side of the previous battery cell 200 and the back side of the subsequent battery cell 300, respectively. At the same time, it can also solve the welding problems existing in traditional processes and ensure the welding effect between the second main body segment 120 and the back side of the subsequent battery cell 300.

[0119] Thus, during the manufacturing of the first main body segment 110, a first welding coating 112 can be first applied to the outer wall of the first core material 111, and then a reflective coating 113 can be applied to a portion of the outer wall of the first welding coating 112. Alternatively, the first welding coating 112 and the reflective coating 113 can be applied to different positions on the outer wall of the first core material 111. In this way, the elements in the reflective coating 113 will not be present in the first welding coating 112, so as not to affect the welding effect between the first main body segment 110 and the previous battery cell 200.

[0120] For the first main body segment 110, the back side of the first main body segment 110 has a first welding coating 112, and the front side of the first main body segment 110 has a reflective coating 113. The back side of the first main body segment 110 is aligned with the front side of the preceding battery cell 200, and the front side of the first main body segment 110 is away from the front side of the preceding battery cell 200. In this way, the functions of different positions of the first main body segment 110 are differentiated, so that the first main body segment 110 is welded to the front side of the preceding battery cell 200 through the first welding coating 112, and reflects sunlight through the reflective coating 113.

[0121] Meanwhile, the outer surface of the second main body segment 120 has a second welding coating 122. The coatings on the first main body segment 110 and the second main body segment 120 are different, so that the first main body segment 110 and the second main body segment 120 exhibit different optical and electrical properties on the front side of the preceding cell 200 and the back side of the following cell 300, in order to meet the usage requirements of different installation positions and improve the power of the photovoltaic module.

[0122] Understandably, conventional solder ribbons can only be coated with a single layer of tin, making it impossible to differentiate the optical and electrical functions of the front and back sides. Therefore, this application uses separate first main body segments 110 and second main body segments 120 connected by an overlapping segment 130 to form a complete conductive connector 100. In this way, the elements coated on the first main body segments 110 and second main body segments 120 can be configured as needed to present differentiated optical and electrical performance, thereby improving the power output of the photovoltaic module.

[0123] For example, when the first welding coating 112 includes a tin-lead alloy coating or a tin-lead-bismuth alloy coating, the reflective coating 113 includes an aluminum coating or a silver coating, and the second welding coating 122 includes a tin-lead alloy coating or a tin-lead-bismuth alloy coating, the overlapping section 130 includes tin, lead, and copper elements, and also includes either aluminum or silver elements.

[0124] In this way, the first welding coating 112 is welded to the front side of the preceding battery cell 200 through the tin and lead elements in the tin-lead alloy coating, facilitating the welding connection between the first main body segment 110 and the preceding battery cell 200. Simultaneously, the reflective coating 113 reflects sunlight through silver or aluminum elements, ensuring a good reflective effect. The second welding coating 122 is connected to the back side of the following battery cell 300 through the tin and lead elements, facilitating the connection between the second main body segment 120 and the back side of the following battery cell 300.

[0125] In one embodiment, the first core material 111, the second core material 121, the third core material 131, and the fourth core material 132 are made of copper substrate. That is, the inner core of the first main body segment 110, the second main body segment 120, and the overlapping segment 130 is made of copper substrate, which can be electrically connected to the preceding battery cell 200 and the following battery cell 300 to ensure conductivity.

[0126] See Figures 8 to 10 In one embodiment, the overlapping segment 130 further includes a covering layer 133, which covers the outer periphery of the third core material 131 and the fourth core material 132. After the third core material 131 and the fourth core material 132 are stacked and connected, the covering layer 133 covers the outer periphery of the stacked third core material 131 and the fourth core material 132 to protect the third core material 131 and the fourth core material 132.

[0127] See Figures 8 to 10 In one embodiment, the covering layer 133 includes a first covering body 1331 and a second covering body 1332. The first covering body 1331 covers a portion of the outer periphery of the third core material 131, and the second covering body 1332 covers a portion of the outer periphery of the fourth core material 132. The first covering body 1331 and the second covering body 1332 are connected at the layering of the third core material 131 and the fourth core material 132.

[0128] In other words, the first covering body 1331 covers part of the outer periphery of the third core material 131 above the third core material 131, and the second covering body 1332 covers part of the outer periphery of the fourth core material 132 below the fourth core material 132. The first covering body 1331 and the second covering body 1332 are connected in the middle to form a complete covering layer 133, which can cover the outer periphery of the third core material 131 and the fourth core material 132 to protect the third core material 131 and the fourth core material 132.

[0129] In one embodiment, the cladding layer 133 includes a first solder layer and a reflective layer. The first solder layer covers the outer periphery of the third core material 131 and the fourth core material 132, and the reflective layer covers the outer periphery of the first solder layer. Alternatively, the first solder layer and the second solder layer 134 cover the outer periphery of the third core material 131 and the fourth core material 132. That is, the outer surface of the overlapping section 130 is formed by the first solder coating 112 and the reflective layer to cover the outer periphery of the third core material 131 and the fourth core material 132.

[0130] The first solder layer can be applied to the outer periphery of the third core material 131 and the fourth core material 132, and the reflective layer can be applied to at least partially to the outer periphery of the first solder layer, so that the first solder layer and the reflective layer are fused together. Alternatively, the first solder layer can be applied to a portion of the outer periphery of the third core material 131 and the fourth core material 132, and the reflective layer can be applied to the remaining portion of the outer periphery of the third core material 131 and the fourth core material 132. That is, the reflective layer is not disposed on the outer wall of the first solder layer, and the first solder layer and the reflective layer are spliced ​​together to form a complete covering layer 133.

[0131] In one embodiment, the cladding layer 133 may also consist only of a reflective layer, which covers the outer periphery of the third core material 131 and the fourth core material 132. That is, the cladding layer 133 may be made entirely of the material of the reflective layer. In this way, the overlapping section 130 can reflect a certain amount of sunlight through the reflective layer, thereby improving the utilization rate of sunlight.

[0132] In one embodiment, the cladding layer 133 may also consist only of a first solder layer, which covers the outer periphery of the third core material 131 and the fourth core material 132. That is, the cladding layer 133 may be made entirely of the material of the first solder layer. In this way, the cladding layer 133 can reflect a certain amount of sunlight through the first solder layer, and can also achieve welding connection through the first solder layer.

[0133] In one embodiment, the first solder layer comprises a tin-lead alloy, a tin-lead-bismuth alloy, or a tin-silver alloy. Thus, the first solder layer does not contain elements of the reflective layer; that is, it does not contain silver or aluminum. Of course, the tin-lead alloy may also include other trace elements, such as antimony. It is understood that the material of the reflective layer is not limited in principle, as long as the reflective layer can reflect sunlight. In one embodiment, the reflective layer comprises a silver coating or an aluminum coating.

[0134] See Figures 8 to 10 In one embodiment, the overlapping section 130 further includes a second solder layer 134, and there is a gap between the third core material 131 and the fourth core material 132 along the thickness direction. The second solder layer 134 is disposed in the gap to connect the third core material 131 and the fourth core material 132.

[0135] After the third core material 131 and the fourth core material 132 are stacked along the thickness direction, there is a gap between the third core material 131 and the fourth core material 132, and the second solder layer 134 can fill the gap. The second solder layer 134 can play a welding role to achieve a reliable connection between the third core material 131 and the fourth core material 132.

[0136] See Figures 8 to 10 In one embodiment, the second solder layer 134 is used to solder the third core material 131 and the fourth core material 132 to each other, so that the third core material 131 and the fourth core material 132 are independent of each other. After the second solder layer 134 solders the third core material 131 and the fourth core material 132 together, the third core material 131 and the fourth core material 132 are not fused together, and the third core material 131 and the fourth core material 132 are independent of each other, as shown in the figure. Figure 10 As shown.

[0137] See Figures 8 to 10 , Figure 15 In one embodiment, the second solder layer 134 fuses the third core material 131 and the fourth core material 132 together, thereby partially fusing the third core material 131 and the fourth core material 132. Figure 15 for Figure 10 The first deformed diagram of the overlapping segment 130 shown is shown. That is to say, after the second solder layer 134 welds the third core material 131 and the fourth core material 132 together, the second solder layer 134, part of the third core material 131 and part of the fourth core material 132 can be fused together.

[0138] See Figures 8 to 10 , Figure 16 In one embodiment, the second solder layer 134 fuses and connects the third core material 131, the fourth core material 132 and the cladding layer 133, so that the third core material 131, the fourth core material 132 and the cladding layer 133 are fused into one. Figure 16 for Figure 10 The second deformed diagram shows the overlapping segment 130 cut open. That is, after the second solder layer 134 welds the third core material 131 and the fourth core material 132 together, the second solder layer 134, the third core material 131, the fourth core material 132 and the cladding layer 133 can be completely fused together.

[0139] In one embodiment, the second solder layer 134 comprises a tin-lead alloy, a tin-lead-bismuth alloy, or a tin-silver alloy. Thus, the second solder layer 134 does not contain elements of the reflective layer; that is, it does not contain silver or aluminum. The second solder layer 134 serves as a flux, facilitating the soldering connection between the third core material 131 and the fourth core material 132, and ensuring the reliability of the connection.

[0140] The conductive connector 100 of this application has a different first cross-sectional shape of the first core material 111 in the first main body segment 110 and a different second cross-sectional shape of the second core material 121 in the second main body segment 120. The first main body segment 110 can reflect sunlight on the front side of the preceding solar cell 200, and the second main body segment 120 can reduce the shading area on the back side of the following solar cell 300, so as to improve the utilization rate of sunlight, thereby improving the power of the photovoltaic module and improving the reliability of the photovoltaic module.

[0141] Meanwhile, the cross-sectional shape of the third core material 131 in the overlapping section 130 is different from that of the fourth core material 132, which facilitates the forming and conductive connection of the first main body section 110 and the second main body section 120. The third core material 131 and the fourth core material 132 in the overlapping section 130 are overlapped and connected by the second solder layer 134 to achieve the conductive connection between the first main body section 110 and the second main body section 120.

[0142] Furthermore, the conductive connector 100 can independently process the first main body segment 110 and the second main body segment 120, so that the first main body segment 110 and the second main body segment 120 can exhibit different optical and electrical properties, respectively adapting to the front side of the previous battery cell 200 and the back side of the subsequent battery cell 300. Then, they are connected by the overlapping segment 130 to form an integrated conductive connector 100, which is then serially soldered to the previous battery cell 200 and the subsequent battery cell 300, reducing the difficulty of the process.

[0143] See Figures 1 to 5This application also provides a solar cell string 10, including multiple solar cells and multiple conductive connectors 100 as described in any of the above embodiments. The multiple solar cells are arranged along the length direction, and the conductive connectors 100 conductively connect the front side of the preceding solar cell 200 to the back side of the following solar cell 300 in adjacent solar cells.

[0144] After adopting the conductive connector 100 of the above embodiment, the first main body segment 110 of the solar cell string 10 of this application can reflect sunlight on the front side of the preceding cell 200, and the second main body segment 120 can reduce the shading area on the back side of the following cell 300, so as to improve the utilization rate of sunlight, thereby increasing the power of the photovoltaic module and improving the reliability of the photovoltaic module. At the same time, the third cross-sectional shape of the third core material 131 stacked in the overlapping segment 130 is different from the cross-sectional shape of the fourth core material 132, which facilitates the forming and conductive connection of the first main body segment 110 and the second main body segment 120.

[0145] Multiple conductive connectors 100 are arranged at intervals along the width direction of the preceding solar cell 200 and connect the front side of the preceding solar cell 200 to the back side of the following solar cell 300, thereby connecting the preceding solar cell 200 and the following solar cell 300 using multiple conductive connectors 100. In this way, the multiple conductive connectors 100 can evenly distribute the current, reduce the current carrying capacity of a single conductive connector 100, reduce resistance loss and heat generation, and at the same time increase the contact area, reduce the contact resistance of the current transmission path, and improve the overall efficiency of the photovoltaic module.

[0146] In one embodiment, the front side of the preceding battery cell 200 has a front metal electrode along its length, and a first main body segment 110 is correspondingly connected to the front metal electrode. The back side of the following battery cell 300 has a back metal electrode along its length, and a second main body segment 120 is connected to the back metal electrode. In this way, the first welding wire can collect the current of the preceding battery cell 200, and the second welding wire can collect the current of the following battery cell 300.

[0147] See Figures 2 to 8 In one embodiment of this application, the overlapping section 130 of the conductive connector 100 is located on the back side of the subsequent solar cell 300. That is, the overlapping section 130 is completely located on the back side of the subsequent solar cell 300 and is not located on the front side of the preceding solar cell 200. In this way, the overlapping section 130 will not block the front side of the preceding solar cell 200, thereby avoiding affecting the light-receiving area of ​​the preceding solar cell 200, improving the power of the photovoltaic module, reducing the spacing between the preceding solar cell 200 and the subsequent solar cell 300, and also ensuring the appearance of the front side of the solar cell string 10.

[0148] In another embodiment of this application, the overlapping section 130 of the conductive connector 100 is located on the front side of the preceding battery cell 200. That is, the overlapping section 130 is completely located on the front side of the preceding battery cell 200 and is not located on the back side of the following battery cell 300. In this way, the overlapping section 130 will not block the back side of the following battery cell 300, and at the same time, the overlapping section 130 can also reflect a certain amount of sunlight on the front side of the preceding battery cell 200.

[0149] In another embodiment of this application, the overlapping section 130 of the conductive connector 100 may also be partially located on the front side of the preceding battery cell 200 and partially located on the back side of the following battery cell 300. That is, a portion of the overlapping section 130 is on the front side of the preceding battery cell 200, and the remaining portion is on the back side of the following battery cell 300.

[0150] In one embodiment, when the overlapping segment 130 is located on the front side of the preceding battery cell 200 and the back side of the following battery cell 300, the length of the overlapping segment 130 on the back side of the following battery cell 300 is greater than the length of the overlapping segment 130 on the front side of the preceding battery cell 200. That is, the length of the overlapping segment 130 on the back side of the following battery cell 300 is greater than its length on the front side of the preceding battery cell 200. This reduces the obstruction of the front side of the preceding battery cell 200 by the overlapping segment 130.

[0151] This application discloses a photovoltaic module, which includes at least a cover plate, a back sheet, and a plurality of solar cell strings 10 as described in any of the above embodiments. The plurality of solar cell strings 10 are connected in parallel and / or in series. The cover plate and the back sheet are disposed on both sides of the plurality of solar cell strings 10, and the cover plate, the plurality of solar cell strings 10, and the back sheet are encapsulated to form a photovoltaic module.

[0152] Multiple solar cell strings 10 are connected in series and / or in parallel. Subsequent processes such as layout, lamination, and frame assembly are used to encapsulate the cover plate, the multiple solar cell strings 10, and the backsheet to form a photovoltaic module. By using the solar cell strings 10 of the above embodiment, the photovoltaic module of this application reduces the manufacturing difficulty of the conductive connector 100, increases the power of the photovoltaic module, and also reduces the distance between the preceding cell 200 and the following cell 300, thereby improving the efficiency of the photovoltaic module.

[0153] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above 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.

[0154] The embodiments described above are merely illustrative of several implementation methods of this application, and 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 those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A conductive connector, characterized in that, It includes a first main body segment (110), an overlapping segment (130), and a second main body segment (120) connected in sequence. The first main body segment (110) is connected to the front side of the previous battery cell (200), and the second main body segment (120) is connected to the back side of the next battery cell (300). The first main body segment (110) has a first core material (111), the second main body segment (120) has a second core material (121), and the overlapping segment (130) has a third core material (131) and a fourth core material (132) stacked together. The first core material (111) has a first cross-sectional shape, the second core material (121) has a second cross-sectional shape, the third core material (131) has a third cross-sectional shape, and the fourth core material (132) has a fourth cross-sectional shape, wherein the first cross-sectional shape, the second cross-sectional shape, the third cross-sectional shape, and the fourth cross-sectional shape are different from each other.

2. The conductive connector according to claim 1, characterized in that, The third cross-section shape and the fourth cross-section shape are both flat.

3. The conductive connector according to claim 2, characterized in that, The first cross-section is triangular or a triangle with a transitional chamfer; The second cross-section is circular; The third cross-sectional shape is the shape that the first cross-sectional shape is flattened. The fourth cross-sectional shape is the shape that the second cross-sectional shape becomes after being flattened.

4. The conductive connector according to claim 3, characterized in that, The aspect ratio of the third core material (131) is in the range of 8 to 12; And / or, the aspect ratio of the fourth core material (132) is in the range of 8 to 12.

5. The conductive connector according to claim 1, characterized in that, Along the thickness direction, the width of the lower core material in the overlapping segment (130) is greater than the width of the upper core material; And / or, the dimension of the overlapping segment (130) along the length direction is greater than or equal to 0.5 mm; And / or, the dimension of the overlapping segment (130) along the thickness direction is less than 0.15 mm; And / or, the overlapping segment (130) is separated from the front metal electrode of the preceding cell (200) and / or the back metal electrode of the following cell (300).

6. The conductive connector according to claim 1, characterized in that, The first core material (111), the second core material (121), the third core material (131) and the fourth core material (132) are made of copper substrate.

7. The conductive connector according to any one of claims 1 to 6, characterized in that, The overlapping section (130) further includes a covering layer (133) which covers the outer periphery of the third core material (131) and the fourth core material (132).

8. The conductive connector according to claim 7, characterized in that, The covering layer (133) includes a first covering body (1331) and a second covering body (1332). The first covering body (1331) covers a portion of the outer periphery of the third core material (131), and the second covering body (1332) covers a portion of the outer periphery of the fourth core material (132). The first covering body (1331) and the second covering body (1332) are connected at the layering point of the third core material (131) and the fourth core material (132).

9. The conductive connector according to claim 7, characterized in that, The covering layer (133) includes a reflective layer, which covers the outer periphery of the third core material (131) and the fourth core material (132); Alternatively, the covering layer (133) includes a first solder layer and a reflective layer, wherein the first solder layer covers the outer periphery of the third core material (131) and the fourth core material (132), and the reflective layer covers the outer periphery of the first solder layer; or, the first solder layer and the reflective layer cover the outer periphery of the third core material (131) and the fourth core material (132). Alternatively, the covering layer (133) may include a first solder layer that covers the outer periphery of the third core material (131) and the fourth core material (132).

10. The conductive connector according to claim 7, characterized in that, The overlapping section (130) further includes a second solder layer (134), and there is a gap between the third core material (131) and the fourth core material (132) along the thickness direction. The second solder layer (134) is disposed in the gap to connect the third core material (131) and the fourth core material (132).

11. The conductive connector according to claim 10, characterized in that, The second solder layer (134) welds the third core material (131) and the fourth core material (132) to each other, so that the third core material (131) and the fourth core material (132) are independent of each other; Alternatively, the second solder layer (134) fuses the third core material (131) and the fourth core material (132) together, so that the third core material (131) and the fourth core material (132) are partially fused together; Alternatively, the second solder layer (134) fuses the third core material (131), the fourth core material (132) and the cladding layer (133) together, so that the third core material (131), the fourth core material (132) and the cladding layer (133) are fused into one.

12. The conductive connector according to claim 7, characterized in that, The cladding layer (133) further includes a first solder layer, which includes a tin-lead alloy, a tin-lead-bismuth alloy, or a tin-silver alloy. And / or, the covering layer (133) further includes a reflective layer, the reflective layer including a silver coating or an aluminum coating; And / or, the overlapping segment (130) further includes a second solder layer (134), the second solder layer (134) comprising a tin-lead alloy, a tin-lead-bismuth alloy or a tin-silver alloy.

13. The conductive connector according to any one of claims 1 to 6, characterized in that, The first main body segment (110) further includes a first welding coating (112) and a reflective coating (113). The first welding coating (112) and the reflective coating (113) cover the outer periphery of the first core material (111). The first welding coating (112) is located on the surface of the first core material (111) facing the previous battery cell (200), and the reflective coating (113) is located on the surface of the first core material (111) away from the previous battery cell (200). And / or, the second body segment (120) further includes a second welding coating (122) which covers the outer periphery of the second core material (121).

14. A solar cell string, characterized in that, It includes multiple solar cells and multiple conductive connectors (100) as described in any one of claims 1 to 13. Multiple solar cells are arranged along the length direction, and the conductive connector (100) conductively connects the front side of the preceding solar cell (200) to the back side of the following solar cell (300).

15. The solar cell string according to claim 14, characterized in that, The overlapping segment (130) is located on the back of the subsequent battery cell (300), and / or the overlapping segment (130) is located on the front of the preceding battery cell (200); When the overlapping segment (130) is located on the front side of the preceding battery and the back side of the following battery cell (300), the length of the overlapping segment (130) on the back side of the following battery cell (300) is greater than the length of the overlapping segment (130) on the front side of the preceding battery cell (200).

16. A photovoltaic module, characterized in that, It includes at least a cover plate, a back plate, and a plurality of solar cell strings (10) as described in claim 14 or 15. Multiple solar cell strings (10) are connected in parallel and / or in series. The cover plate and the back plate are disposed on both sides of the multiple solar cell strings (10) and encapsulate the cover plate, the multiple solar cell strings (10) and the back plate to form the photovoltaic module.

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