photovoltaic modules

Abstract

This utility model discloses a photovoltaic module, comprising: multiple solar cells, including at least adjacent first and second solar cells; the first solar cells having multiple first edge pads on their grid lines, and the second solar cells having multiple second edge pads on their grid lines; a connector connecting the first and second solar cells on the same side, with a welding layer on at least a portion of the outer peripheral surface of the connector; wherein the thickness of the welding layer on the connector opposite to the first edge pads near the second solar cell is less than the thickness of the welding layer on the connector opposite to the first edge pads away from the second solar cell; and / or, the thickness of the welding layer on the connector opposite to the second edge pads near the first solar cell is less than the thickness of the welding layer on the connector opposite to the second edge pads away from the first solar cell. This photovoltaic module can mitigate the risk of grid breakage due to over-soldering on the outer side of the pads, thereby improving the production yield of photovoltaic modules.

Description

Technical Field

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

[0002] In traditional technology, adjacent solar cells are connected by solder ribbons. The solder ribbons can draw out the current collected by the grid lines of the solar cells, allowing multiple solar cells to be connected in series or parallel to form a battery string. When the solder ribbons are soldered to the grid lines on the corresponding solar cells, the solder on the ribbons melts and forms an alloy with the grid lines, thereby achieving an electrical connection.

[0003] However, during the soldering process, excessive melting of the tin layer can easily lead to over-soldering and grid breakage. Furthermore, after outdoor installation and during use, the growth of the alloy layer can cause increased grid resistance or grid line breakage, thus affecting the performance of the photovoltaic modules. Therefore, ensuring the solder ribbon and grid line soldering effect while preventing grid breakage on the outer side of the pad point near the cell gap is a problem that urgently needs to be solved. Utility Model Content

[0004] This invention aims to at least solve one of the technical problems existing in the prior art. Therefore, one objective of this invention is to provide a photovoltaic module that can mitigate the risk of grid breakage due to over-soldering on the outer side of the Pad point near the gap between two adjacent cells, thereby improving the production yield of photovoltaic modules and extending their service life.

[0005] A photovoltaic module according to a first aspect embodiment of the present invention includes: a plurality of solar cells, wherein the plurality of solar cells includes at least adjacent first solar cells and second solar cells, each solar cell having a grid line extending along a first direction, the grid line of the first solar cell having a plurality of first edge pads, the plurality of first edge pads being located near the two ends of the grid line on the first solar cell along the first direction, the grid line of the second solar cell having a plurality of second edge pads, the plurality of second edge pads being located near the two ends of the grid line on the second solar cell along the first direction, the first direction being the arrangement direction of the plurality of solar cells; and a connector for connecting the solar cells. The first and second battery cells are on the same side, and the connector is electrically connected to the grid lines on the first and second battery cells respectively. At least a portion of the outer peripheral surface of the connector is provided with a welding layer, wherein the thickness of the welding layer on the connector opposite to the first edge Pad point near the second battery cell is less than the thickness of the welding layer on the connector opposite to the first edge Pad point away from the second battery cell; and / or, the thickness of the welding layer on the connector opposite to the second edge Pad point near the first battery cell is less than the thickness of the welding layer on the connector opposite to the second edge Pad point away from the first battery cell.

[0006] According to the photovoltaic module of this invention, by limiting the thickness of the solder layer at different locations on the connector, the solder buildup on the outer grid lines of the Pad point near the gap between two adjacent cells due to over-soldering can be reduced. This reduces the risk of grid line breakage on the outer side of the first edge Pad point (i.e., the outer side of the first edge Pad point near the second cell), improving the production yield of the photovoltaic module and extending its service life. Furthermore, it can prevent the growth of the alloy layer during outdoor installation and power generation from causing increased grid line resistance or grid line breakage, ensuring the performance of the photovoltaic module and extending its service life.

[0007] According to some embodiments of the present invention, each connector includes a first connecting segment and a plurality of second connecting segments. The plurality of second connecting segments are respectively connected to the first battery cell and the second battery cell. The first connecting segment is connected between the plurality of second connecting segments. At least a portion of the first connecting segment is located between the first edge Pad point and the second edge Pad point on the mutually close side of the first battery cell and the second battery cell. A second welding layer is provided on the outer peripheral surface of the second connecting segment.

[0008] According to some embodiments of the present invention, a first welding layer is provided on the outer peripheral surface of the first connecting segment, and the thickness of the first welding layer is less than the thickness of the second welding layer.

[0009] According to some embodiments of the present invention, the thickness of the first welding layer is D1, wherein D1 satisfies: 0μm < D1 < 10μm; and / or, the thickness of the second welding layer is D2, wherein D2 satisfies: 10μm ≤ D2 ≤ 20μm.

[0010] According to some embodiments of the present invention, an insulating layer is provided on the outer peripheral surface of the first connecting segment.

[0011] According to some embodiments of this utility model, the insulating layer is a black coating.

[0012] According to some embodiments of the present invention, a plurality of second connecting segments include a first sub-connecting segment and a second sub-connecting segment, wherein the first sub-connecting segment is electrically connected to the grid line of the first battery cell, and the second sub-connecting segment is electrically connected to the grid line of the second battery cell; a plurality of first edge Pad points include a first sub-edge Pad point and a second sub-edge Pad point, wherein the second sub-edge Pad point is located on the side of the first sub-edge Pad point closer to the second battery cell; a plurality of second edge Pad points include a third sub-edge Pad point and a fourth sub-edge Pad point, wherein the third sub-edge Pad point is located on the side of the fourth sub-edge Pad point closer to the first battery cell.

[0013] According to some embodiments of the present invention, the length of the first connecting segment is L1, the distance between the second sub-edge Pad point and the third sub-edge Pad point is W1, wherein L1 and W1 satisfy: L1≥W1; and / or, the length of the first connecting segment is L1, wherein L1 satisfies: 0mm<L1≤15mm.

[0014] According to some embodiments of the present invention, the distance between the end of the first sub-connecting segment away from the first connecting segment and the edge of the first battery cell along the first direction is W4, and the distance between the first sub-edge Pad point and the edge of the first battery cell is W5, wherein W4 and W5 satisfy: W4≥W5; and / or, the distance between the end of the second sub-connecting segment away from the first connecting segment and the edge of the second battery cell along the first direction is W6, and the distance between the fourth sub-edge Pad point and the edge of the second battery cell is W7, wherein W6 and W7 satisfy: W6≥W7.

[0015] According to some embodiments of the present invention, the length of the first connecting segment is L1, and the length of the first sub-connecting segment is L. 21 Among them, L1, L 21 Satisfy: 0.05≤L1 / L 21≤0.5; and / or, the length of the first connecting segment is L1, and the length of the second sub-connecting segment is L 22 Among them, L1, L 22 Satisfy: 0.05≤L1 / L 22 ≤0.5; and / or, the length of the first sub-connection segment is L. 21 The length of the second sub-connection segment is L. 22 , wherein, the L 21 L 22 Satisfies: 0mm≤∣L 21 -L 22 |≤5mm.

[0016] According to some embodiments of the present invention, the length of the first sub-connecting segment is L. 21 The distance between the first sub-edge Pad point and the second sub-edge Pad point is W2, wherein the L 21 W2 satisfies: W2≥L 21 ; and / or, the length of the second sub-connection segment is L 22 The distance between the third sub-edge Pad point and the fourth sub-edge Pad point is W3, wherein the L 22 W3 satisfies: W3≥L 22 .

[0017] According to some embodiments of this utility model, the distance between the first sub-edge Pad point and the edge of the first battery cell along the first direction is W5, wherein W5 satisfies: 1mm ≤ W5 ≤ 8mm; and / or, the distance between the second sub-edge Pad point and the edge of the first battery cell along the first direction is W9, wherein W9 satisfies: 1mm ≤ W9 ≤ 8mm; and / or, the distance between the third sub-edge Pad point and the edge of the second battery cell along the first direction is W... 10 , wherein the W 10 Satisfy: 1mm≤W 10 ≤8mm; and / or, along the first direction, the distance between the fourth sub-edge Pad point and the edge of the second battery cell is W7, wherein W7 satisfies: 1mm≤W7≤8mm.

[0018] According to some embodiments of this utility model, W5, W9, W 10 The difference between any two values ​​in W7 is ∆d, where ∆d satisfies: 0mm≤|∆d|≤2mm.

[0019] According to some embodiments of the present invention, the gap between two adjacent battery cells is d, wherein d satisfies: -0.5mm≤d≤2mm; and / or, the width of the connector is W, wherein W satisfies: 0.2mm≤W≤1.2mm.

[0020] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0021] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which: Figure 1 This is a schematic diagram of a photovoltaic module according to an embodiment of the present utility model, wherein only the first and second solar cells are shown among the multiple solar cells. Figure 2 yes Figure 1 Enlarged view of part A shown in the center circle; Figure 3 yes Figure 1 Enlarged view of section B shown in the center circle; Figure 4 yes Figure 1 Enlarged view of section C, shown in the center circle; Figure 5 yes Figure 1 Enlarged view of section D shown in the center circle; Figure 6 yes Figure 1 Enlarged view of section E shown in the center circle; Figure 7 This is a top view of a photovoltaic module according to an embodiment of the present utility model; Figure 8 This is a side view of a photovoltaic module according to an embodiment of the present utility model.

[0022] Figure label: 100. Photovoltaic modules; 1. Solar cell; 11. First solar cell; 111. Grid line; 12. Second solar cell; 2. Connector; 21. First connecting section; 22. Second connecting section; 221. First sub-connection segment; 222. Second sub-connection segment; 23. First connector; 24. Second connector; 25. Third connector; 3. First edge Pad point; 31. First sub-edge Pad point; 32. Second sub-edge Pad point; 4. Second edge Pad point; 41. Third sub-edge Pad point; 42. Fourth sub-edge Pad point. Detailed Implementation

[0023] The embodiments of this utility model are described in detail below. The embodiments described with reference to the accompanying drawings are exemplary. Figures 7-8 A photovoltaic module 100 according to an embodiment of the present utility model is described.

[0024] like Figure 1 , Figure 7 and Figure 8 As shown, the photovoltaic module 100 according to the first aspect of the present invention includes a plurality of solar cells 1 and connectors 2.

[0025] Specifically, the plurality of battery cells 1 include at least adjacent first battery cells 11 and second battery cells 12, and each battery cell 1 is provided with grid lines 111, the grid lines 111 being along a first direction (e.g., Figure 7 Extending in the direction indicated by the middle arrow A, the first battery cell 11 has multiple first edge pads 3 on its grid lines 111, with each first edge pad 3 located near both ends of the grid lines 111 along a first direction. Similarly, the second battery cell 12 has multiple second edge pads 4 on its grid lines 111, with each second edge pad 4 located near both ends of the grid lines 111 along a first direction. The first direction refers to the arrangement direction of the multiple battery cells 1. In this description, "multiple" means two or more.

[0026] For example, in Figure 1 and Figure 8 In the example, each battery cell 1 is provided with multiple grid lines 111, and the grid lines 111 are along a first direction. Figure 7 Extending, multiple grid lines 111 along the second direction (e.g.) Figure 7 The first battery cell 11 has multiple first edge Pad points 3 arranged at intervals in the direction indicated by the middle arrow B. The grid lines 111 of the first battery cell 11 are provided with multiple first edge Pad points 3, which are located near the two ends of the grid lines 111 respectively, and the first direction and the second direction are perpendicular.

[0027] Taking the first battery cell 11 and the second battery cell 12 as an example, Figure 7 Each battery cell 1 shows only one grid line 111. The grid lines 111 on the first battery cell 11 and the second battery cell 12 are opposite each other along the arrangement direction of the multiple battery cells 1. Each grid line 111 on the first battery cell 11 may have multiple pad points. The two pad points closest to both ends of the grid line 111 along its length are called first edge pad points 3. Multiple first edge pad points 3 are arranged along the extension direction of the grid line 111. The aforementioned first edge pad points 3 can be understood as the pad points closest to the grid line 111 along its length (i.e.,...). Figure 7The Pad points are located at the edges (in the direction indicated by arrow A). For example, the main function of the grid line 111 is to collect and transmit current. Since the grid line 111 has a thin diameter, directly contacting its end with an external circuit results in a small contact area, which can easily lead to excessive contact resistance due to "point contact," causing current transmission loss and reducing the photoelectric conversion efficiency of the photovoltaic module 100. Therefore, connector 2 can be used to draw the current from the grid line 111, enabling multiple cells 1 to be connected in series or parallel. It should be noted that the Pad points near both ends of the grid line 111 along its length on the second cell 12 are the second edge Pad points 4. The setting of the second edge Pad points 4 is roughly the same as that of the first edge Pad points 3.

[0028] Combination Figure 1 and Figure 7 The connector 2 connects to the same side of the first battery cell 11 and the second battery cell 12, and the connector 2 is electrically connected to the grid lines 111 on the first battery cell 11 and the second battery cell 12 respectively. For example, refer to Figure 7 The first battery cell 11 and the second battery cell 12 are along the first direction (i.e. Figure 7 The first and second solar cells 11 and 12 are arranged in the direction indicated by the middle arrow A and connected by connector 2. Connector 2 provides a reliable electrical connection between the first solar cell 11 and the second solar cell 12, ensuring smooth current transmission in the photovoltaic module 100, reducing contact resistance, lowering power loss, and thus effectively improving the overall power generation efficiency of the photovoltaic module 100. Furthermore, connector 2 firmly connects the first and second solar cells 11 and 12 together, giving the photovoltaic module 100 a certain mechanical strength to withstand a certain degree of tension, bending, and vibration, preventing the connection between the solar cells 11 from loosening or falling off, and reducing the risk of breakage of the solar cells 11 during transportation and installation, thereby improving the reliability and service life of the photovoltaic module 100.

[0029] Combination Figure 7 Multiple connectors 2 are provided, arranged along the second direction, and extending along the first direction. For example, in Figure 7 In the example, a connection state of a connector 2 is shown. The connector 2 is located on the side of the grid line 111 away from the battery cell 1. A part of the connector 2 is connected to the grid line 111 on the battery cell 1, and another part of the connector 2 is located between two adjacent battery cells 1. The connector 2 is electrically connected to the grid line 111 of the first battery cell 11 and the second battery cell 12 respectively by welding with the first edge Pad point 3 and the second edge Pad point 4.

[0030] Therefore, the arrangement of the first edge Pad point 3 and the second edge Pad point 4 increases the contact area between the grid line 111 and the connector 2, thereby reducing impedance, reducing power loss during current transmission, and improving the photoelectric conversion efficiency of the photovoltaic module 100. Simultaneously, it provides welding positioning, reducing incomplete or missed welds caused by positioning deviations, reducing welding difficulty, improving welding accuracy, increasing the production yield of the photovoltaic module 100, and reducing production costs. Optionally, the multiple grid lines 111 can be arranged alternately along the second direction as multiple positive grid lines 111 and multiple negative grid lines 111, which facilitates the electrical connection of multiple solar cells 1.

[0031] Furthermore, the connector 2 acts as a "bridge," converging and transmitting the dispersed current collected by the grid lines 111, achieving efficient current transmission and improving the photoelectric conversion efficiency of the photovoltaic module 100. Moreover, the electrical connection between the connector 2 and the grid lines 111 constructs a complete current transmission path, enabling efficient current extraction and enhancing the performance of the photovoltaic module 100. Simultaneously, the connector 2 physically connects adjacent cells 1 to form a fixed structure, effectively improving the internal structural stability of the photovoltaic module 100, preventing cell cracking during installation or transportation, and extending the lifespan of the photovoltaic module 100.

[0032] A welding layer is provided on at least a portion of the outer peripheral surface of the connector 2. Specifically, the thickness of the welding layer on the connector 2 opposite to the first edge Pad point 3 near the second battery cell 12 is less than the thickness of the welding layer on the connector 2 opposite to the first edge Pad point 3 away from the second battery cell 12; and / or, the thickness of the welding layer on the connector 2 opposite to the second edge Pad point 4 near the first battery cell 11 is less than the thickness of the welding layer on the connector 2 opposite to the second edge Pad point 4 away from the first battery cell 11.

[0033] For example, for the first battery cell, the grid line of the first battery cell has two first edge pads. The thickness of the weld layer at the corresponding position of the connector opposite the first edge pad of the second battery cell is less than the thickness of the weld layer at the corresponding position of the connector opposite the first edge pad of the second battery cell. For the second battery cell, the grid line of the second battery cell has two second edge pads. The thickness of the weld layer at the corresponding position of the connector opposite the second edge pad of the first battery cell is less than the thickness of the weld layer at the corresponding position of the connector opposite the second edge pad of the second battery cell.

[0034] During the production of the photovoltaic module 100, the connector 2 achieves electrical connection with the grid lines 111 through welding. The welding layer material can be a tin layer, a tin-lead alloy layer, or a tin-lead-bismuth alloy layer, etc. During the welding process between the grid lines 111 and the connector 2, the welding layer material on the surface of the connector 2 melts at high temperature, penetrates into the metal layer (such as silver paste) surface of the grid lines 111, and forms an alloy layer after cooling, thereby achieving mechanical and electrical connection. By limiting the thickness of the welding layer at different locations on the connector 2, the tin accumulation on the outer grid lines of the Pad point near the gap between two adjacent cells 1 due to over-soldering can be reduced, thereby reducing the risk of grid line breakage on the outer side of the first edge Pad point 3 (i.e., the outer side of the first edge Pad point 3 near the second cell 12), improving the production yield of the photovoltaic module 100, and extending the service life of the photovoltaic module 100. In addition, it can also prevent the growth of the alloy layer during the outdoor installation and power generation of the photovoltaic module 100 from causing an increase in the resistance of the grid lines 111 or causing them to break, ensuring the performance of the photovoltaic module 100 and extending its service life.

[0035] According to the first aspect of the present invention, the photovoltaic module 100, by limiting the thickness of the solder layer at different positions on the connector 2, can reduce the solder buildup on the outer grid lines of the Pad point near the gap between two adjacent cells 1 due to over-soldering. This reduces the risk of grid line breakage on the outer side of the first edge Pad point 3 (i.e., the outer side of the first edge Pad point 3 near the second cell 12), improves the production yield of the photovoltaic module 100, and extends the service life of the photovoltaic module 100. Furthermore, it can prevent the growth of the alloy layer during outdoor installation and power generation from causing an increase in the resistance or breakage of the grid lines 111, ensuring the performance of the photovoltaic module 100 and extending its service life.

[0036] According to some embodiments of the present invention, each connector 2 includes a first connecting segment 21 and a plurality of second connecting segments 22. The plurality of second connecting segments 22 are respectively connected to the first battery cell 11 and the second battery cell 12. The first connecting segment 21 is connected between the plurality of second connecting segments 22. At least a portion of the first connecting segment 21 is located between the first edge Pad point 3 and the second edge Pad point 4 on the mutually close side of the first battery cell 11 and the second battery cell 12. A second welding layer is provided on the outer peripheral surface of the second connecting segment 22.

[0037] For example, the two ends of the first connecting segment 21 are respectively connected to one end of a plurality of second connecting segments 22. At least a portion of the first connecting segment 21 is located between two adjacent first edge Pad points 3 and second edge Pad points 4 of two adjacent battery cells 1. The other ends of the plurality of second connecting segments 22 extend to the first edge Pad point 3 and second edge Pad point 4 on opposite sides of two adjacent battery cells 1. A second welding layer (not shown in the figure) is provided on the outer peripheral surface of the second connecting segment 22.

[0038] For example, Figure 7 The diagram shows the connection state of a connector 2. Multiple connectors 2 are arranged at intervals along the second direction and are respectively opposite to multiple grid lines 111 on the corresponding battery cell 1. The connection principle between the multiple grid lines 111 and the multiple connectors 2 is similar to... Figure 7 The connection principle of connector 2 shown is the same.

[0039] For example, connector 2 can be electrically connected to grid line 111 by welding. In this application, connector 2 is arranged in a connection structure of "second connecting segment 22 - first connecting segment 21 - second connecting segment 22" along the first direction. The left and right ends of the first connecting segment 21 are respectively connected to one end of two adjacent second connecting segments 22 along the first direction. That is, two second connecting segments 22 are connected through the first connecting segment 21 to form a complete connector 2. Moreover, at least a part of the first connecting segment 21 is located between two adjacent first edge Pad points 3 and second edge Pad points 4 of two adjacent battery cells 1. This can be understood as follows: a part of the first connecting segment 21 is located between two adjacent first edge Pad points 3 and second edge Pad points 4 on the side of the first battery cell 11 and the second battery cell 12 that are close to each other. The other part of the first connecting segment 21 extends to the side of the two adjacent first edge Pad points 3 and second edge Pad points 4 that are close to the center of the battery cell 1. Alternatively, the entire first connecting segment 21 may be located between the first edge Pad point 3 at the right end of the first solar cell 11 and the second edge Pad point 4 at the left end of the second solar cell 12. This arrangement facilitates the accurate positioning and welding of the connector 2 to the adjacent solar cell 1, thereby improving the stability and accuracy of the connection and increasing the production yield of the photovoltaic module 100.

[0040] For example, in the production process of photovoltaic module 100, connector 2 achieves electrical connection with grid line 111 through welding. The welding layer material can be tin layer, tin-lead alloy layer, or tin-lead-bismuth alloy layer, etc. During the welding process between grid line 111 and connector 2, the welding layer material on the surface of connector 2 melts at high temperature, penetrates into the metal layer (such as silver paste) surface of grid line 111, and forms an alloy layer after cooling, thereby achieving mechanical and electrical connection.

[0041] In one embodiment of this application, the second welding layer is only covered on the outer peripheral surface of the second connecting segment 22. That is, the outer peripheral surfaces of both second connecting segments 22 are covered with the second welding layer, while the first connecting segment 21 is not covered with a welding layer. Thus, by segmenting the welding layer on the connector 2, the second welding layer on the second connecting segment 22 can correspond to the Pad point on the grid line 111, facilitating the welding of the Pad point to the connector 2. When the connector 2 is electrically connected to the battery cell 1 by welding, it can improve the welding accuracy while ensuring the welding stability with the grid line 111, reduce the solder accumulation at the first connecting segment 21 due to over-soldering, thereby reducing the risk of grid line 111 grid breakage outside the edge Pad point, improving the production yield of the photovoltaic module 100, and extending the service life of the photovoltaic module 100. In addition, it can also prevent the growth of the alloy layer during the outdoor installation and power generation of the photovoltaic module 100 from causing an increase in the resistance of the grid line 111 or causing it to break, ensuring the performance of the photovoltaic module 100 and extending its service life.

[0042] According to some embodiments of the present invention, a first welding layer (not shown in the figure) is provided on the outer peripheral surface of the first connecting segment 21, and the thickness of the first welding layer is less than the thickness of the second welding layer.

[0043] For example, the outer peripheral surface of the first connecting segment 21 is covered with a first welding layer, while the outer peripheral surface of the second connecting segment 22 is covered with a second welding layer. Furthermore, the thickness of the first welding layer is less than the thickness of the second welding layer. When the thickness of the first welding layer is smaller, the tin content in the first welding layer is correspondingly reduced. When the connector 2 is welded to the grid line 111, the tin content in at least a portion of the first connecting segment 21, i.e., the area between two adjacent first edge Pad points 3 and second edge Pad points 4 on the adjacent side of two adjacent battery cells 1 (i.e., the first connecting segment 21), is relatively low. This effectively reduces tin accumulation outside the edge Pad points (i.e., at the first connecting segment 21), mitigates the risk of grid line 111 breakage caused by over-soldering, reduces welding difficulty, and improves the production yield of the photovoltaic module 100. In addition, it can prevent the growth of the alloy layer during outdoor installation and power generation of the photovoltaic module 100 from causing an increase in the resistance or breakage of the grid line 111, ensuring the performance of the photovoltaic module 100 and extending its service life. Furthermore, the low tin content in the first welding layer facilitates good insulation between the first connection segment 21 and the solar cell 1, eliminating the need for printed insulating layers, preventing grid breakage, reducing process complexity, and improving production efficiency. In addition, it blocks unnecessary conductive paths, avoids short-circuit risks, improves the operational stability of the photovoltaic module 100, and extends its lifespan. Simultaneously, by changing the thickness of the first and second welding layers, the tin content in both layers can be controlled, effectively reducing tin accumulation on the outer side of the edge pad point (i.e., at the first connection segment 21), mitigating the risk of grid breakage on the outer side of the edge pad point caused by over-soldering, and improving the production yield of the photovoltaic module 100.

[0044] Optionally, during the soldering process, solder paste (such as tin-lead, tin-silver-copper alloys, etc.) is applied to the first edge Pad point 3 and the second edge Pad point 4 as a flux to ensure the stability of the soldering between the connector 2 and the grid line 111. Thus, by applying solder paste to the first edge Pad point 3 and the second edge Pad point 4, the stability of the soldering between the connector 2 and the grid line 111 is ensured, while the soldering effect is improved, resulting in a good electrical connection between the connector 2 and the grid line 111, thereby improving the photoelectric conversion efficiency of the photovoltaic module 100.

[0045] In some optional embodiments of this application, the first welding layer and the second welding layer can be set as the same type of welding material layer, which helps to reduce the complexity of photovoltaic module 100 production and improve production efficiency.

[0046] According to some embodiments of this utility model, the thickness of the first welding layer is D1, wherein D1 satisfies: 0μm < D1 < 10μm. And / or, the thickness of the second welding layer is D2, wherein D2 satisfies: 10μm ≤ D2 ≤ 20μm.

[0047] For example, when the thickness D1 of the first welding layer is greater than or equal to 10 μm, the thickness is too large, making it easy for tin to accumulate at the first connection section 21 during welding. This increases the risk of grid breakage at the outer side of the edge Pad point 111, increases welding difficulty, and reduces the production yield of the photovoltaic module 100. Therefore, when the thickness D1 of the first welding layer satisfies the condition 0 μm < D1 < 10 μm, the thickness range of the first welding layer is reasonable, which can effectively reduce tin accumulation at the edge Pad point during welding, thereby reducing the risk of grid breakage at the outer side of the edge Pad point 111, reducing welding difficulty, and improving the production yield of the photovoltaic module 100. At the same time, it can also prevent the growth of the alloy layer during the power generation process of the photovoltaic module 100 from causing an increase in the resistance of the grid line 111 or causing it to break, ensuring the performance of the photovoltaic module 100 and extending its service life.

[0048] When the thickness D2 of the second welding layer is less than 10 μm, meaning the tin content in the second welding layer is relatively low, it easily reduces the strength of the weld between the connector 2 and the grid line 111. When the thickness D2 of the second welding layer is greater than 20 μm, the thickness of the second welding layer is too large, meaning the tin content in the second welding layer is high. During the welding process, the molten welding layer formed by the melting of the second welding layer is prone to internal stress due to uneven shrinkage, leading to micro-cracks or delamination between the second welding layer and the substrate (such as copper strip), forming a "false weld" and reducing the welding effect. Moreover, it is also easy to form tin accumulation, thereby causing the risk of grid breakage and reducing the operational stability of the photovoltaic module 100. In addition, an excessively thick second welding layer will increase the shading area, causing the local temperature of the cell 1 to be too high, easily generating a "hot spot effect," accelerating the aging of the cell 1, and thus reducing the photoelectric conversion efficiency of the photovoltaic module 100. In addition, it will also increase production costs and increase welding difficulty.

[0049] Therefore, when the thickness D2 of the second welding layer satisfies the condition 10μm≤D2≤20μm, the thickness range of the second welding layer is reasonable, which helps to improve welding accuracy and stability, improve the electrical connection accuracy between the connector 2 and the solar cell 1, reduce contact resistance, and improve photoelectric conversion efficiency. Furthermore, it can also improve the structural stability of the photovoltaic module 100, reduce transportation difficulties, and extend its service life.

[0050] According to some other embodiments of the present invention, an insulating layer is provided on the outer peripheral surface of the first connecting segment 21.

[0051] In some embodiments of this application, an insulating layer is covered on the outer peripheral surface of the first connecting segment 21, i.e., the first welding layer is an insulating layer without tin. This configuration, with an insulating layer covering the outer peripheral surface of the first connecting segment 21, prevents tin accumulation at the first connecting segment 21, thereby effectively reducing the risk of grid breakage on the outer side of the edge pad point, improving the operational stability of the photovoltaic module 100, and extending its service life. Simultaneously, it also reduces welding difficulty, improves welding effect, and increases the production yield of the photovoltaic module 100. Furthermore, good insulation can be achieved at the first connecting segment 21 without printing insulating adhesive, thereby blocking unnecessary pathways, reducing the risk of short circuits, and improving the operational stability of the photovoltaic module 100. Additionally, it can reduce the processing difficulty of the photovoltaic module 100 and improve production efficiency.

[0052] According to some embodiments of this utility model, the insulating layer is a black coating.

[0053] For example, in this application, the insulating layer on the outer peripheral surface of the first connecting segment 21 is a black coating. Therefore, when there are gaps between the solar cells 1 and the photovoltaic module 100 is an all-black module, no black shading strip is needed at the gaps to achieve the all-black appearance of the photovoltaic module 100, simplifying the processing steps and ensuring its performance. Furthermore, it improves the aesthetics of the photovoltaic module 100 and expands its application scenarios. Additionally, it reduces manufacturing difficulty and improves production efficiency and yield.

[0054] According to some embodiments of this utility model, refer to Figure 7 and Figure 8 The plurality of second connecting segments 22 include a first sub-connecting segment 221 and a second sub-connecting segment 222. The first sub-connecting segment 221 is electrically connected to the grid line 111 of the first battery cell 11, and the second sub-connecting segment 222 is electrically connected to the grid line 111 of the second battery cell 12. The plurality of first edge pad points 3 include a first sub-edge pad point 31 and a second sub-edge pad point 32. The second sub-edge pad point 32 is located on the side of the first sub-edge pad point 31 closer to the second battery cell 12. The plurality of second edge pad points 4 include a third sub-edge pad point 41 and a fourth sub-edge pad point 42. The third sub-edge pad point 41 is located on the side of the fourth sub-edge pad point 42 closer to the first battery cell 11.

[0055] The first sub-connecting segment 221 is located above and connected to the first solar cell 11, and the second sub-connecting segment 222 is located above and connected to the second solar cell 12. The first connecting segment 21 is located between the first sub-connecting segment 221 and the second sub-connecting segment 222. The first sub-connecting segment 221 is electrically connected to the grid lines 111 of the first solar cell 11, and the second sub-connecting segment 222 is electrically connected to the grid lines 111 of the second solar cell 12. This configuration establishes a complete current loop between the first solar cell 11 and the second solar cell 12. The connection between the second connecting segment 22 and the grid lines 111 of the two solar cells 1 forms a continuous conductive network, allowing for uniform current transmission on the surface of the solar cell 1, thereby reducing resistance loss and improving the photoelectric conversion efficiency of the photovoltaic module 100. Furthermore, welding enables a stable welded structure between the connector 2 and the grid lines 111, preventing breakage or fracture of the solar cell 1 during transportation and installation, thus improving the reliability and lifespan of the photovoltaic module 100. Furthermore, the partitioning of connector 2 facilitates precise connection between different positions on connector 2 and corresponding solar cells 1, improving the assembly efficiency of the solar module. Simultaneously, it also facilitates the setting of the first welding layer or insulating layer on the first connecting segment 21, thereby further mitigating the problem of broken grid lines 111 on the outer side of the edge pad points caused by over-soldering, and improving the production yield of the photovoltaic module 100.

[0056] For example, in Figure 7 In the example, along the first direction, a first sub-edge pad 31 is provided on the left side of the first solar cell 11 near its edge, and a second sub-edge pad 32 is provided on the right side of the first solar cell 11 near the second solar cell 12. Simultaneously, a third sub-edge pad 33 is provided on the left side of the second solar cell 12 near its second sub-edge pad 32, and a fourth sub-edge pad 34 is provided on the right side of the second solar cell 12 near its edge. This arrangement facilitates accurate positioning and welding of the connector 2 and the grid line 111, improving welding quality, reducing welding difficulty, and increasing the production yield of the photovoltaic module 100. Furthermore, it helps to provide a reliable current transmission path, resulting in uniform current distribution, reduced transmission loss, and improved photoelectric conversion efficiency of the photovoltaic module 100.

[0057] Optionally, the first sub-connecting segment, the second sub-connecting segment, and the first connecting segment may have different colors and / or diameters. Therefore, when the connector 2 is welded to the grid line 111, the welding machine can accurately identify different areas of the connector 2 by recognizing the length or color of different positions within the connector 2, and place the connector 2 in the corresponding position of the corresponding solar cell 1, reducing the risk of incomplete soldering, improving the welding effect, and thus increasing the production yield of the photovoltaic module 100.

[0058] According to some embodiments of this utility model, refer to Figure 7The length of the first connecting segment 21 is L1, and the distance between the second sub-edge Pad point 32 and the third sub-edge Pad point 41 is W1, wherein L1 and W1 satisfy: L1≥W1. And / or, the length of the first connecting segment 21 is L1, wherein L1 satisfies: 0mm<L1≤15mm.

[0059] Reference Figure 7 The first connecting segment 21 overlaps with the second sub-edge Pad points 32 and 41 of the first and second solar cells 11 on their adjacent sides, or the two ends of the first connecting segment 21 extend to the opposite sides of the second sub-edge Pad points 32 and 41 of the two adjacent solar cells 1. Therefore, the length relationship between the first connecting segment 21 and the second sub-edge Pad points 32 and 41 of the two adjacent solar cells 1 is designed to reduce the positioning accuracy requirements of the welding machine, thereby improving the welding effect and increasing the assembly efficiency of the photovoltaic module.

[0060] When the length L1 of the first connecting segment 21 is greater than 15mm, the length of the first connecting segment 21 is too long. The left and right ends of the first connecting segment may extend beyond the corresponding edge Pad points, which will reduce the welding effect between the second connecting segment and the corresponding edge Pad points, and may further reduce the connection strength between the connector and the grid line 111. Therefore, when the length L1 of the first connecting segment 21 satisfies: 0mm < L1 ≤ 15mm, the length of the first connecting segment 21 is reasonably set, which can reduce the welding difficulty and improve the production yield of the photovoltaic module 100. Moreover, it is also beneficial to reduce the energy loss of the photovoltaic module 100, improve the photoelectric conversion efficiency, and thus improve the performance. It should be noted that the length of the first connecting segment 21 is related to the gap between two adjacent cells 1 and the design position of the first edge Pad point 3 and the second edge Pad point 4, and can be set according to the actual situation to reduce the welding difficulty of the connector 2 and improve the production yield of the photovoltaic module 100.

[0061] According to some embodiments of this utility model, refer to Figure 2 , Figure 5 and Figure 7 Along the first direction, the distance between the end of the first sub-connecting segment 221 furthest from the first connecting segment 21 and the edge of the first battery cell 11 is W4, and the distance between the first sub-edge Pad point 31 and the edge of the first battery cell 11 is W5, wherein W4 and W5 satisfy: W4≥W5. And / or, along the first direction, the distance between the end of the second sub-connecting segment 222 furthest from the first connecting segment 21 and the edge of the second battery cell 12 is W6, and the distance between the fourth sub-edge Pad point 42 and the edge of the second battery cell 12 is W7, wherein W6 and W7 satisfy: W6≥W7.

[0062] According to some optional embodiments of this application, refer to Figure 2 Along the first direction, the distance between the end of the first sub-connecting segment 221 furthest from the first connecting segment 21 and the edge of the first battery cell 11 is W4, and the distance between the first sub-edge Pad point 31 and the edge of the first battery cell 11 is W5, where W4 and W5 satisfy: W4 ≥ W5. That is to say, combined with Figure 7 The distance between the left edge of the first sub-connecting segment 221 and the left edge of the first solar cell 11 is greater than the distance between the first sub-edge Pad point 31 and the left edge of the first solar cell 11, or the distance between the left edge of the first sub-connecting segment 221 and the left edge of the first solar cell 11 is equal to the distance between the first sub-edge Pad point 31 and the left edge of the first solar cell 11. Therefore, this design allows for a certain deviation in the cut length of the connector without exposing the edge Pad point, thus reducing the cutting accuracy requirements for the left end of the first sub-connecting segment. This facilitates rapid cutting of the connector and rapid assembly of the connector with the corresponding solar cell. Furthermore, it also ensures that the edge Pad points near the cell gaps are less likely to detach during photovoltaic module transportation.

[0063] According to some optional embodiments of this application, the distance between the end of the second sub-connecting segment 222 away from the first connecting segment 21 and the edge of the second battery cell 12 along the first direction is W6, and the distance between the fourth sub-edge Pad point 42 and the edge of the second battery cell 12 is W7, wherein W6 and W7 satisfy: W6 ≥ W7. That is, combined with Figure 7 The distance between the right edge of the second sub-connecting segment 222 and the left edge of the second solar cell 12 is greater than the distance between the fourth sub-edge Pad point 42 and the right edge of the second solar cell 12, or the distance between the right edge of the second sub-connecting segment 222 and the edge of the second solar cell 12 is equal to the distance between the fourth sub-edge Pad point 42 and the right edge of the second solar cell 12. Therefore, this design allows for a certain deviation in the cut length of the connector without exposing the edge Pad point, thus reducing the cutting accuracy requirements for the left end of the first sub-connecting segment. This facilitates rapid cutting of the connector and rapid assembly of the connector with the corresponding solar cell. Furthermore, it ensures that the edge Pad points near the cell gaps are less likely to detach during photovoltaic module transportation.

[0064] According to some embodiments of the present invention, the length of the first connecting segment 21 is L1, and the length of the first sub-connecting segment 221 is L... 21 Among them, L1 and L 21 Satisfy: 0.05≤L1 / L 21 ≤0.5. And / or, the length of the first connecting segment 21 is L1, and the length of the second sub-connecting segment 222 is L.22 Among them, L1 and L 22 Satisfy: 0.05≤L1 / L 22 ≤0.5. And / or, the length of the first sub-connection segment 221 is L. 21 The length of the second sub-connector segment 222 is L. 22 , where L 21 L 22 Satisfies: 0mm≤∣L 21 -L 22 |≤5mm.

[0065] According to some optional embodiments of this application, the length of the first connecting segment 21 and the length of the first sub-connecting segment 221 satisfy: 0.05 ≤ L1 / L 21 ≤0.5. Therefore, the length relationship between the first connecting segment 21 and the first sub-connecting segment 221 is reasonably set, which helps to improve the positional correspondence accuracy of the first connecting segment 21, the first sub-connecting segment 221, and the two first edge Pad points 3 on the first solar cell 11, improves the placement accuracy of the connector 2, thereby improving the welding effect and increasing the production yield of the photovoltaic module 100. Simultaneously, it can also be combined with the setting of the first welding layer to effectively mitigate the risk of grid breakage on the outer side of the edge Pad points, reduce the phenomenon of incomplete soldering, and ensure the stability of the photovoltaic module 100 in use.

[0066] According to some optional embodiments of this application, the length of the first connecting segment 21 and the length of the second sub-connecting segment 222 satisfy: 0.05 ≤ L1 / L 22 ≤0.5. Therefore, the length relationship between the first connecting segment 21 and the second sub-connecting segment 222 is reasonably set, which helps to improve the positional correspondence accuracy between the first connecting segment 21, the second sub-connecting segment 222 and the second edge Pad point 4 on the second solar cell 12, improves the placement accuracy of the connector 2, thereby improving the welding effect and increasing the production yield of the photovoltaic module 100. Simultaneously, it can also be combined with the setting of the first welding layer to effectively improve the risk of grid breakage on the outer side of the edge Pad point, reduce the phenomenon of incomplete soldering, and ensure the stability of the photovoltaic module 100 in use. Furthermore, it helps to reduce the amount of material used in the connector 2, avoid waste, thereby reducing the production cost of the photovoltaic module 100 and improving market competitiveness.

[0067] Therefore, the first connecting segment 21 serves as the transition area of ​​the connector 2. When the length of the first connecting segment 21 is reasonably set in relation to the lengths of the first sub-connecting segment 221 and the second sub-connecting segment 222, it helps to improve the positional correspondence accuracy between the first connecting segment 21, the first sub-connecting segment 221, and the second sub-connecting segment 222 and the first edge Pad point 3 and the second edge Pad point 4, thereby improving the placement accuracy of the connector 2, thus improving the welding effect and increasing the production yield of the photovoltaic module 100. Simultaneously, it can be combined with the setting of the first welding layer to effectively mitigate the risk of grid breakage on the outer side of the edge Pad point, reduce the phenomenon of incomplete soldering, and ensure the stability of the photovoltaic module 100 in use. Furthermore, it can reduce the risk of edge cracking of the cell 1, prevent blackening around the EL (electroluminescent) area, ensure the photoelectric conversion efficiency of the photovoltaic module 100, and extend its service life. Additionally, it helps to reduce the amount of material used in the connector 2, avoiding waste and thus reducing production costs.

[0068] For example, the difference between the lengths of the first sub-connecting segment 221 and the second sub-connecting segment 222 satisfies: 0mm≤|L 21 -L 22 |≤5mm, meaning the length relationship between the first sub-connecting segment 221 and the second sub-connecting segment 222 can be such that the length of the first sub-connecting segment 221 is greater than the length of the second sub-connecting segment 222, the length of the first sub-connecting segment 221 is less than the length of the second sub-connecting segment 222, or the length of the first sub-connecting segment 221 is equal to the length of the second sub-connecting segment 222. In other words, the first solar cell 11 and the second solar cell 12 can be solar cells 1 of the same size, or they can be solar cells 1 of different specifications (e.g., different dimensions along the first direction). With this configuration, the connector 2 of this application, through its segmented design, allows for flexible setting of different connection segment lengths, thus enabling it to be applied to solar cells 1 of various specifications (e.g., multiple solar cells in a photovoltaic module can be selected according to the arrangement requirements of the photovoltaic module, with multiple solar cells having the same or different sizes). This is beneficial for optimizing the solar cell layout, expanding the light-receiving area, improving the surface utilization and photoelectric conversion efficiency of the photovoltaic module 100, and expanding the application scenarios of the connector 2.

[0069] According to some embodiments of this utility model, refer to Figure 7 The length of the first sub-connection segment 221 is L. 21 The distance between the first sub-edge Pad point 31 and the second sub-edge Pad point 32 is W2, where L 21 W2 satisfies: W2≥L 21 And / or, the length of the second sub-connection segment 222 is L. 22 The distance between the third sub-edge Pad point 41 and the fourth sub-edge Pad point 42 is W3, where L 22 W3 satisfies: W3≥L 22.

[0070] For example, in Figure 7 In the example, along the first direction, a first sub-edge pad 31 is provided on the left side of the first solar cell 11 near its edge, and a second sub-edge pad 32 is provided on the right side of the first solar cell 11 near the second solar cell 12. Simultaneously, a third sub-edge pad 41 is provided on the left side of the second solar cell 12 near its second sub-edge pad 32, and a fourth sub-edge pad 42 is provided on the right side of the second solar cell 12 near its edge. This arrangement facilitates accurate positioning and welding of the connector 2 and the grid line 111, improving welding quality, reducing welding difficulty, and increasing the production yield of the photovoltaic module 100. Furthermore, it helps to provide a reliable current transmission path, resulting in uniform current distribution, reduced transmission loss, and improved photoelectric conversion efficiency of the photovoltaic module 100.

[0071] According to some optional embodiments of this application, the length of the first sub-connection segment 221 is L. 21 The distance between the first sub-edge Pad point 31 and the second sub-edge Pad point 32 is W2, where L 21 W2 satisfies: W2≥L 21 That is, the distance between the first sub-edge Pad point 31 and the second sub-edge Pad point 32 is greater than the length of the first sub-connecting segment 221. This effectively prevents the second welding layer covering the outer periphery of the first sub-connecting segment 221 from contacting the grid lines 111 outside the first sub-edge Pad point 31 and the second sub-edge Pad point 32, thereby effectively reducing the risk of grid line breakage on the outer side of the edge Pad point 31, and thus improving the production yield of the photovoltaic module 100 and ensuring the stability of the photovoltaic module 100's performance.

[0072] According to some optional embodiments of this application, the length of the second sub-connection segment 222 is L. 22 The distance between the third sub-edge Pad point 41 and the fourth sub-edge Pad point 42 is W3, where L 22 W3 satisfies: W3≥L 22 That is, the distance between the third sub-edge Pad point 41 and the fourth sub-edge Pad point 42 is greater than the length of the second sub-connecting segment 222. This effectively prevents the second welding layer covering the outer periphery of the second sub-connecting segment 222 from contacting the grid lines 111 outside the third and fourth sub-edge Pad points 41 and 42, thereby effectively reducing the risk of grid line breakage on the outer side of the edge Pad point 3, and thus improving the production yield of the photovoltaic module 100 and ensuring the stability of the photovoltaic module 100's performance.

[0073] According to some embodiments of this utility model, refer to Figure 3 and Figure 7The distance between the first sub-edge Pad point 31 and the edge of the first battery cell 11 along the first direction is W5, where W5 satisfies: 1mm ≤ W5 ≤ 8mm. And / or, the distance between the second sub-edge Pad point 32 and the edge of the first battery cell 11 along the first direction is W9, where W9 satisfies: 1mm ≤ W9 ≤ 8mm. And / or, the distance between the third sub-edge Pad point 41 and the edge of the second battery cell 12 along the first direction is W... 10 Among them, W 10 Satisfy: 1mm≤W 10 ≤8mm. And / or, along the first direction, the distance between the fourth sub-edge Pad point 42 and the edge of the second battery cell 12 is W7, where W7 satisfies: 1mm≤W7≤8mm.

[0074] According to some optional embodiments of this application, refer to Figure 3 and Figure 7 The distance between the first sub-edge Pad point 31 and the edge of the first solar cell 11 along the first direction is W5, where W5 satisfies: 1mm ≤ W5 ≤ 8mm. Therefore, the distance between the first sub-edge Pad point 31 and the left edge of the first solar cell 11 is reasonably set, providing a buffer space for the left edge of the first solar cell 11, reducing the risk of microcracks in the first solar cell 11 during welding of the connector 2 or under external force, and extending the service life of the photovoltaic module 100. Furthermore, it also provides operating space for positioning, cutting, and welding of the connector 2, reducing welding difficulty and improving welding results. Additionally, it reduces the "edge effect" between the first sub-edge Pad point 31 and the left edge of the first solar cell 11, avoiding excessive current concentration at the edge, reducing the risk of thermal damage, and extending the service life of the photovoltaic module 100.

[0075] According to some optional embodiments of this application, refer to Figure 3 and Figure 7 Along the first direction, the distance between the second sub-edge Pad point 32 and the edge of the first solar cell 11 is W9, where W9 satisfies: 1mm ≤ W9 ≤ 8mm. Therefore, the distance between the second sub-edge Pad point 32 and the left edge of the first solar cell 11 is reasonably set, providing buffer space for the right edge of the first solar cell 11, reducing the risk of microcracks in the first solar cell 11 during welding of the connector 2 or under external force, and extending the service life of the photovoltaic module 100. Furthermore, it also provides operating space for positioning, cutting, and welding of the connector 2, reducing welding difficulty and improving welding results.

[0076] According to some optional embodiments of this application, refer to Figure 4 and Figure 7 The distance between the third sub-edge Pad point 41 and the edge of the second battery cell 12 along the first direction is W. 10Among them, W 10 Satisfy: 1mm≤W 10 ≤8mm. Therefore, the distance between the third sub-edge Pad point 41 and the left edge of the second solar cell 12 is reasonably set, providing a buffer space for the left edge of the second solar cell 12, reducing the risk of microcracks in the second solar cell 12 during welding of the connector 2 or under external force, and extending the service life of the photovoltaic module 100. Furthermore, it also provides operating space for positioning, cutting, and welding of the connector 2, reducing welding difficulty and improving welding results. Additionally, it reduces the "edge effect" between the third sub-edge Pad point 41 and the left edge of the second solar cell 12, avoiding excessive current concentration at the edge, reducing the risk of thermal damage, and extending the service life of the photovoltaic module 100.

[0077] According to some optional embodiments of this application, refer to Figure 7 The distance between the fourth sub-edge Pad point 42 and the edge of the second solar cell 12 along the first direction is W7, where W7 satisfies: 1mm ≤ W7 ≤ 8mm. Therefore, the distance between the fourth sub-edge Pad point 42 and the right edge of the second solar cell 12 is reasonably set, providing a buffer space for the right edge of the second solar cell 12, reducing the risk of microcracks in the second solar cell 12 during welding of the connector 2 or under external force, and extending the service life of the photovoltaic module 100. Furthermore, it also provides operating space for positioning, cutting, and welding of the connector 2, reducing welding difficulty and improving welding results. Additionally, it reduces the "edge effect" between the fourth sub-edge Pad point 42 and the right edge of the second solar cell 12, avoiding excessive current concentration at the edge, reducing the risk of thermal damage, and extending the service life of the photovoltaic module 100.

[0078] Therefore, by setting the distances between the first sub-edge Pad point 31, the second sub-edge Pad point 32 and the two edges of the first battery cell 11 to satisfy: 1mm≤W5≤8mm, 1mm≤W9≤8mm respectively, and the distances between the third sub-edge Pad point 41, the fourth sub-edge Pad point 42 and the two edges of the second battery cell 12 to satisfy: 1mm≤W5≤8mm respectively. 10 The distances between the first sub-edge Pad point 31 and the second sub-edge Pad point 32 and the two edges of the first solar cell 11, and the distances between the third sub-edge Pad point 41 and the fourth sub-edge Pad point 42 and the two edges of the second solar cell 12 are all reasonably set, thus providing buffer space for the edges of the solar cell 1, reducing the risk of microcracks in the solar cell 1 during welding of the connector 2 or under external force, and extending the service life of the photovoltaic module 100. In addition, it also provides operating space for positioning, cutting and welding of the connector 2, reducing welding difficulty and improving welding effect.

[0079] According to some embodiments of this utility model, W5, W9, W10 The difference between any two values ​​in W7 is ∆d, and ∆d satisfies: 0mm≤∣∆d∣≤2mm.

[0080] For example, W5, W9, W 10 The absolute value of the difference ∆d between any two points in W7 is between 0mm and 2mm. This can be understood as the distances between the first sub-edge Pad point 31 and the left edge of the first solar cell 11, the second sub-edge Pad point 32 and the right edge of the first solar cell 11, the third sub-edge Pad point 41 and the left edge of the second solar cell 12, and the fourth sub-edge Pad point 42 and the right edge of the second solar cell 12. A certain deviation is allowed, and the deviation value of any two points must be within the aforementioned range. Therefore, this deviation range allows for a certain amount of redundancy in the welding machine's positioning, which helps to reduce welding accuracy requirements, allows for slight positioning deviations in the welding machine, improves the production yield of the photovoltaic module 100, and reduces production costs.

[0081] According to some embodiments of this utility model, refer to Figure 7 The gap between two adjacent battery cells 1 is d, where d satisfies: -0.5mm ≤ d ≤ 2mm. And / or, the width of the connector 2 is W, where W satisfies: 0.2mm ≤ W ≤ 1.2mm.

[0082] For example, when the gap d between two adjacent solar cells 1 satisfies -0.5mm ≤ d < 0, that is, the edges of the two adjacent solar cells 1 overlap (not shown in the figure). This arrangement optimizes the arrangement of solar cells 1, which can increase the effective utilization area of ​​the photovoltaic module 100, significantly increase the effective light-receiving area of ​​the photovoltaic module 100, increase power density, reduce additional losses, and improve the photoelectric conversion efficiency of the photovoltaic module 100.

[0083] When the gap d between two adjacent solar cells 1 is equal to 0, that is, the two adjacent solar cells 1 are tightly fitted (not shown in the figure). This setting can eliminate invalid gaps in the photovoltaic module 100, optimize the arrangement of solar cells 1, expand the light-receiving area, and improve the photoelectric conversion efficiency of the photovoltaic module 100. In addition, when the photovoltaic module 100 is a completely black module, there are no gaps between the solar cells, eliminating the need for black shading strips, reducing the manufacturing difficulty of the photovoltaic module 100 and improving production efficiency.

[0084] Reference Figure 7When the gap d between two adjacent solar cells 1 satisfies 0mm < d ≤ 2mm, a certain gap exists between the two adjacent solar cells 1. This setting ensures a reasonable gap between adjacent solar cells 1, thereby optimizing the cell arrangement, reducing ineffective gaps in the photovoltaic module 100, and improving photoelectric conversion efficiency. Furthermore, the gap acts as a "buffer zone," dispersing localized impact forces, reducing the risk of microcracks in the solar cells 1, and extending the lifespan of the photovoltaic module 100. In other words, the photovoltaic module of this invention can be applied to various arrangement methods to meet the needs of different application scenarios. It should be noted that the gap between two adjacent solar cells 1 can be set according to the actual application to improve the applicability of the photovoltaic module.

[0085] In some specific embodiments of this application, a black insulating coating is provided on the outer peripheral surface of the first connecting segment 21. When the photovoltaic module 100 is an all-black module, there is no need to place a black shielding strip between the two solar cells 1, thereby reducing the manufacturing difficulty, improving the production yield of the photovoltaic module 100, and increasing production efficiency. At the same time, it also helps to improve the aesthetics of the all-black module and expand its application scenarios.

[0086] For example, when the width W of connector 2 is greater than 1.2 mm, the excessive width of connector 2 increases the shading area of ​​solar cell 1, reduces the effective light-receiving area, and thus reduces the photoelectric conversion efficiency of photovoltaic module 100. Therefore, a reasonable width range for connector 2 can effectively reduce the impact of connector 2 on the bifaciality of photovoltaic module 100 while ensuring welding strength, thereby improving photoelectric conversion efficiency and performance.

[0087] In some specific embodiments of this application, combined with Figure 6 The connector 2 extends along a first direction, and the plurality of connectors 2 include at least a first connector 23, a second connector 24 and a third connector 25. The first connector 23 connects the grid line 111 of the first battery cell 11 and the grid line 111 of the second battery cell 12. The second connector 24 and the third connector 25 are arranged along the first direction. The second connector 24 connects the grid line 111 of the first battery cell 11 and the grid line 111 of the battery cell 1 located on the side of the first battery cell 11 away from the second battery cell 12. The third connector 25 connects the grid line 111 of the second battery cell 12 and the grid line 111 of the battery cell 1 located on the side of the second battery cell 12 away from the first battery cell 11.

[0088] The photovoltaic module 100 and its operation according to the embodiments of this utility model are known to those skilled in the art and will not be described in detail here.

[0089] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0090] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example.

[0091] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A photovoltaic module, characterized by, include: The battery includes multiple battery cells, each comprising at least an adjacent first battery cell and a second battery cell. Each battery cell has a grid line extending along a first direction. The grid line of the first battery cell has multiple first edge pads, each of which is located near both ends of the grid line along the first direction. The grid line of the second battery cell has multiple second edge pads, each of which is located near both ends of the grid line along the first direction. The first direction is the arrangement direction of the multiple battery cells. A connector is provided, which connects the first battery cell and the second battery cell to the same side, and is electrically connected to the grid lines on the first battery cell and the second battery cell respectively. At least a portion of the outer peripheral surface of the connector is provided with a welding layer. Wherein, the thickness of the weld layer on the connector opposite to the first edge Pad point near the second battery cell is less than the thickness of the weld layer on the connector opposite to the first edge Pad point away from the second battery cell; and / or The thickness of the weld layer on the connector opposite the second edge Pad point near the first battery cell is less than the thickness of the weld layer on the connector opposite the second edge Pad point away from the first battery cell.

2. The photovoltaic module of claim 1, wherein, Each of the connectors includes a first connecting segment and a plurality of second connecting segments. The plurality of second connecting segments are respectively connected to the first battery cell and the second battery cell. The first connecting segment is connected between the plurality of second connecting segments. At least a portion of the first connecting segment is located between the first edge Pad point and the second edge Pad point on the mutually close side of the first battery cell and the second battery cell. A second welding layer is provided on the outer peripheral surface of the second connecting segment.

3. The photovoltaic module of claim 2, wherein, A first welding layer is provided on the outer peripheral surface of the first connecting segment, and the thickness of the first welding layer is less than the thickness of the second welding layer.

4. The photovoltaic module of claim 3, wherein, The thickness of the first weld layer is D1, wherein D1 satisfies: 0 μm < D1 < 10 μm; and / or The thickness of the second weld layer is D2, wherein D2 satisfies: 10μm≤D2≤20μm.

5. The photovoltaic module of claim 2, wherein, An insulating layer is provided on the outer peripheral surface of the first connecting segment.

6. The photovoltaic module of claim 5, wherein, The insulating layer is a black coating.

7. The photovoltaic module of claim 2, wherein, The plurality of second connection segments include a first sub-connection segment and a second sub-connection segment, wherein the first sub-connection segment is electrically connected to the grid line of the first solar cell, and the second sub-connection segment is electrically connected to the grid line of the second solar cell; The plurality of first edge pad points include a first sub-edge pad point and a second sub-edge pad point, the second sub-edge pad point being located on the side of the first sub-edge pad point closer to the second battery cell. The plurality of second edge pad points include a third sub-edge pad point and a fourth sub-edge pad point, the third sub-edge pad point being located on the side of the fourth sub-edge pad point closer to the first battery cell.

8. The photovoltaic module of claim 7, wherein, The length of the first connecting segment is L1, and the distance between the second sub-edge Pad point and the third sub-edge Pad point is W1, wherein L1 and W1 satisfy: L1 ≥ W1; and / or The length of the first connecting segment is L1, wherein L1 satisfies: 0mm < L1 ≤ 15mm.

9. The photovoltaic module of claim 7, wherein, Along the first direction, the distance between the end of the first sub-connecting segment furthest from the first connecting segment and the edge of the first battery cell is W4, and the distance between the first sub-edge Pad point and the edge of the first battery cell is W5, wherein W4 and W5 satisfy: W4 ≥ W5; and / or Along the first direction, the distance between the end of the second sub-connecting segment away from the first connecting segment and the edge of the second battery cell is W6, and the distance between the fourth sub-edge Pad point and the edge of the second battery cell is W7, wherein W6 and W7 satisfy: W6≥W7.

10. The photovoltaic module of claim 7, wherein, The length of the first connecting section is L1, and the length of the first sub-connecting section is L 21 wherein the L1, L 21 satisfies: 0.05≤L1 / L 21 ≤0.5; and / or The length of the first connecting section is L1, and the length of the second sub-connecting section is L 22 wherein the L1, L 22 satisfies: 0.05≤L1 / L 22 ≤0.5; and / or The length of the first sub connecting section is L 21 The length of the second sub connecting section is L 22 Wherein, the L 21 , L 22 Satisfy: 0mm≤|L 21 -L 22 |≤5mm.

11. The photovoltaic module of claim 7, wherein, The length of the first sub-connection section is L 21 The distance between the first sub-edge Pad point and the second sub-edge Pad point is W2, wherein the L 21 , W2 satisfy: W2≥L 21 ; and / or The length of the second sub-connection section is L 22 The distance between the third sub-edge Pad point and the fourth sub-edge Pad point is W3, wherein the L 22 , W3 satisfy: W3≥L 22 .

12. The photovoltaic module of claim 7, wherein, Along the first direction, the distance between the first sub-edge Pad point and the edge of the first battery cell is W5, wherein W5 satisfies: 1mm ≤ W5 ≤ 8mm; and / or Along the first direction, the distance between the second sub-edge Pad point and the edge of the first battery cell is W9, wherein W9 satisfies: 1mm ≤ W9 ≤ 8mm; and / or A distance between the third sub-edge Pad point and an edge of the second cell piece in the first direction is W 10 wherein the W 10 satisfies: 1 mm ≤ W 10 ≤ 8 mm; and / or Along the first direction, the distance between the fourth sub-edge Pad point and the edge of the second battery cell is W7, wherein W7 satisfies: 1mm≤W7≤8mm.

13. The photovoltaic module of claim 12, wherein, The difference between any two of W5, W9, W 10 The difference between any two of W5, W9, W d, the d satisfies: 0mm≤ d≤2mm.

14. The photovoltaic module of any of claims 1-13, wherein, The gap between two adjacent solar cells is d, wherein d satisfies: -0.5mm ≤ d ≤ 2mm; and / or The width of the connector is W, wherein W satisfies: 0.2mm≤W≤1.2mm.

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