Photovoltaic module

Abstract

The embodiment of the invention relates to the field of photovoltaic technology, and provides a photovoltaic module, which comprises a solar cell and a solder strip, N first grid lines extending along a first direction are arranged on a first surface of the solar cell, and second grid lines are arranged on a second surface of the solar cell; through lines are arranged on the first face of the solar cell and comprise the first through line and the second through line, and the first through line is connected to the first grid line to the Ath first grid line which are arranged in the second direction. The second through line is connected to the Nth first grid line to the (N-B) th first grid line which are arranged in the second direction; one end of the welding strip is connected to the Cth first grid line to the N-Dth first grid line which are arranged in the second direction, and the other end of the welding strip is connected to the second grid line of the other solar cell. The photovoltaic module provided by the embodiment of the invention is at least beneficial to reducing the warping problem of the battery pieces in the photovoltaic module.

Description

Technical Field

[0001] The embodiments of the present application relate to the field of photovoltaic technology, and in particular to a photovoltaic module. Background Art

[0002] Solar cells are devices that directly convert light energy into electrical energy through the photoelectric effect or photochemical effect. Single solar cells cannot be used to generate electricity directly. Several single cells must be connected in series and parallel through welding strips and tightly sealed into components before use. Solar cell components (also called solar panels) are the core part of solar power generation systems and the most important part of solar power generation systems. The function of solar cell components is to convert solar energy into electrical energy, or send it to batteries for storage, or drive loads to work.

[0003] The connection between the battery cells usually requires a welding strip for collecting current. The conventional welding strip needs to be alloyed with the fine grid by welding. Due to the different thermal expansion coefficients of the welding strip and the battery cell, there are also differences in thermal conductivity, which leads to warping of the battery cell after welding with the welding strip. Warping of the battery cell will cause defects such as hidden cracks and broken pieces, resulting in a decrease in the reliability and yield rate of the battery assembly finished product during the pressing of the battery cell layers. Summary of the invention

[0004] The embodiments of the present application provide a photovoltaic module, which at least helps to reduce the warping problem of the cells in the photovoltaic module.

[0005] According to some embodiments of the present application, on one hand, the embodiments of the present application provide a photovoltaic component, including: a solar cell, the solar cell having a first surface and a second surface relative to each other, N first grid lines extending along the first direction are arranged on the first surface of the solar cell, the first grid lines are arranged at intervals along the second direction, and the second surface of the solar cell is provided with a second grid line; the first surface of the solar cell is provided with a through line, the through lines include a first through line and a second through line, the first through line connects the first first grid line to the Ath first grid line arranged along the second direction, A is a positive integer greater than or equal to 2; the second through line connects the Nth first grid line to the NBth first grid line arranged along the second direction, B is a positive integer greater than or equal to 1; a welding strip, one end of the welding strip is connected to the Cth first grid line to the NDth first grid line arranged along the second direction, C is a positive integer greater than 1 and less than or equal to A, D is a positive integer greater than or equal to 1 and less than or equal to B, and the other end of the welding strip is connected to the second grid line of another solar cell.

[0006] In some embodiments, along the first direction, a portion of the welding strips are connected to the Cth first grid line through the first penetration line, and another portion of the welding strips are directly connected to the Cth first grid line.

[0007] In some embodiments, compared with the end of the welding strip directly connected to the Cth first gate line, the end of the welding strip connected to the Cth first gate line through the first through line is farther away from the first first gate line.

[0008] In some embodiments, along the first direction, a ratio of a width of the first penetration line to a width of the welding strip is 0.8-1.2.

[0009] In some embodiments, a first gate line not connected to the first through line and the second through line has a pad, a width of the pad is greater than a width of the first gate line along the second direction, and a soldering strip is connected to the pad.

[0010] In some embodiments, the Cth first gate line has a welding portion, the width of the welding portion is greater than the width of the first gate line along the second direction, and the welding portion is connected to the welding strip; and / or the NDth first gate line has a welding portion, and the welding portion is connected to the welding strip.

[0011] In some embodiments, along the second direction, a length of the first penetration line is greater than or equal to a length of the second penetration line.

[0012] In some embodiments, it also includes: glue points, the glue points are located on the first surface, the soldering tape is fixed to the first surface through a plurality of glue points, and the end of the soldering tape connected to the first through line is fixed to the first through line through the glue points.

[0013] In some embodiments, on any welding strip, the number of glue dots in the direction from the center of the first surface to the first through line is a first number of glue dots, and the number of glue dots in the direction from the center of the first surface to the second through line is a second number of glue dots, and the first number of glue dots is greater than the second number of glue dots.

[0014] In some embodiments, the glue point that fixes the end of the welding strip to the first through line is located between the first first grid line to the Ath first grid line.

[0015] The technical solution provided by the embodiments of the present application has at least the following advantages:

[0016] In the photovoltaic assembly provided by the embodiment of the present application, a welding strip connects two adjacent solar cells to form a cell string, a first end of the welding strip connects a first grid line on a first surface of a solar cell, and a second end of the welding strip connects a second grid line on a second surface of another solar cell. On the first surface of a solar cell, A first grid lines close to the edge of one side of the solar cell are connected to each other through a first through line, and the end of the welding strip is connected to the Cth grid line between the first first grid line to the Ath first grid line, so that the carriers on the first first grid line to the Ath first grid line can be transmitted to the welding strip; and the end of the welding strip is not connected to the first first grid line on the edge of one side of the solar cell, so that the initial connection position of the end of the welding strip connected to the solar cell is close to the central area of ​​the solar cell, so as to avoid a large welding tension on the edge position of the solar cell after the welding of the welding strip, thereby avoiding the problem of warping of the solar cell caused by the tension of the welding strip. Secondly, the B+ first grid lines near the edge of the other side of the solar cell are interconnected through the second through line, and the middle part of the welding strip is connected to the ND first grid line between the N first grid line to the NB first grid line, so that the carriers on the N first grid line to the NB first grid line can be transmitted to the welding strip; and the middle part of the welding strip is not connected to the N first grid line at the edge of the other side of the solar cell, so that the connection position between the middle part of the welding strip and the solar cell is close to the central area of ​​the solar cell. Since the part of the middle part of the welding strip that is not connected to the solar cell extends from the first side of a solar cell to the second side of another solar cell, the connection between the middle part of the welding strip and the solar cell is close to the central area of ​​the solar cell, which can make the welding strip have appropriate activity space. When relative activity occurs between two adjacent solar cells, the part of the middle part of the welding strip that is not connected to the solar cell can bear part of the tension. Compared with the welding strip connected at the edge of the solar cell, the problem of solar cell fragmentation caused by concentrated tension between the welding strip and the edge of the solar cell can be avoided. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] One or more embodiments are exemplarily illustrated by the pictures in the corresponding drawings. These exemplified descriptions do not constitute a limitation on the embodiments. Unless otherwise specified, the pictures in the drawings do not constitute a scale limitation. In order to more clearly illustrate the embodiments of the present application or the technical solutions in the traditional technology, the drawings required for use in the embodiments are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 A schematic diagram of the structure of a photovoltaic module provided in an embodiment of the present application;

[0019] Figure 2 A schematic diagram of the cross-sectional structure of a photovoltaic module provided in an embodiment of the present application;

[0020] Figure 3 A top view corresponding to a first surface of a photovoltaic module provided in an embodiment of the present application;

[0021] Figure 4 A top view corresponding to the second surface of a photovoltaic module provided in an embodiment of the present application;

[0022] Figure 5 A top view corresponding to the first surface of another photovoltaic module provided in an embodiment of the present application;

[0023] Figure 6 A top view corresponding to the first surface of another photovoltaic assembly provided in an embodiment of the present application. DETAILED DESCRIPTION

[0024] In the description of the embodiments of the present application, technical terms such as "first" and "second" are only used to distinguish different objects and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features.

[0025] In the description of the embodiments of the present application, “plurality” means more than two, unless otherwise clearly and specifically defined.

[0026] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0027] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can represent: A exists, A and B exist at the same time, and B exists. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0028] In the description of the embodiments of the present application, technical terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0029] In the accompanying drawings corresponding to the embodiments of the present application, the thickness and area of ​​the layer are magnified for better understanding and ease of description. When describing a component on another component or on the surface of another component, the component may be "directly" located on the surface of the other component, or a third component may be present between the two components. On the contrary, when describing a component on the surface of another component or when another component is formed or provided on the surface of a component, it means that there is no third component between the two components. In addition, when describing a component as "substantially" formed on another component, it means that the component is not formed on the entire surface (or front surface) of the other component, nor is it formed on a partial edge of the entire surface.

[0030] In the description of the embodiments of the present application, when a certain component “includes” another component, unless otherwise stated, other components are not excluded and other components may be further included.

[0031] The terms used in the description of the various described embodiments herein are used only to describe specific embodiments and are not intended to be limiting. As used in the description of the various described embodiments and the appended claims, "components" are also intended to include plural forms unless the context clearly indicates otherwise.

[0032] The following will describe the various embodiments of the present application in detail with reference to the accompanying drawings. However, it will be appreciated by those skilled in the art that in the various embodiments of the present application, many technical details are provided in order to enable the reader to better understand the present application. However, even without these technical details and various changes and modifications based on the following embodiments, the technical solution claimed in the present application can be implemented.

[0033] Figure 1 A schematic diagram of the structure of a photovoltaic module provided in an embodiment of the present application; Figure 2 A schematic diagram of the cross-sectional structure of a photovoltaic module provided in an embodiment of the present application; Figure 3 A top view corresponding to a first surface of a photovoltaic module provided in an embodiment of the present application; Figure 4 This is a top view corresponding to the second surface of a photovoltaic module provided in an embodiment of the present application. Figure 3 and Figure 4 For ease of explanation, the soldering strip is taken as an example in a perspective state and the position of the soldering strip is corresponded to the dotted line frame.

[0034] refer to Figures 1 to 4 The photovoltaic module includes: a solar cell 100 and a welding ribbon 200, each welding ribbon 200 connecting two adjacent solar cells 100. The solar cell 100 has a first surface 101 and a second surface 102 opposite to each other, and the welding ribbon 200 connects a first grid line 110 on the first surface 101 of an adjacent solar cell 100 and a second grid line 120 on the second surface 102 of another solar cell 100. Figure 3 , N first grid lines 110 extending along the first direction X are arranged on the first surface 101 of the solar cell 100, and the first grid lines 110 are arranged at intervals along the second direction Y. Figure 4 The second surface 102 of the solar cell 100 is provided with M second grid lines 120 extending along the first direction X, and the second grid lines 120 are arranged at intervals along the second direction Y.

[0035] refer to Figure 3 , the first surface 101 of the solar cell 100 is further provided with penetration lines 130, and the penetration lines 130 include a first penetration line 131 and a second penetration line 132. The first penetration line 131 connects the first first grid line 110 to the Ath first grid line 110 arranged along the second direction Y, A is a positive integer greater than or equal to 2, specifically, the first penetration line 131 connects the first first grid line 110 to the Ath first grid line 110 in the direction from the first edge 103 to the second edge 104 of the solar cell 100. The second penetration line 132 connects the Nth first grid line 110 to the NBth first grid line 110 arranged along the second direction Y, B is a positive integer greater than or equal to 1, specifically, the second penetration line 132 connects the first first grid line 110 to the B+1th first grid line 110 in the direction from the second edge 104 to the first edge 103 of the solar cell 100.

[0036] Combined with reference Figures 1 to 4 The first end of the welding ribbon 200 is connected to the Cth first grid line 110 to the NDth first grid line 110 arranged along the second direction Y, C is a positive integer greater than 1 and less than or equal to A, D is a positive integer greater than or equal to 1 and less than or equal to B, and the second end of the welding ribbon 200 is connected to the second grid line 120 of another solar cell 100.

[0037] In the photovoltaic module provided in the embodiment of the present application, the welding ribbon 200 connects two adjacent solar cells 100 to form a cell string, the first end of the welding ribbon 200 is connected to the first grid line 110 on the first surface 101 of one solar cell 100, and the second end of the welding ribbon 200 is connected to the second grid line 120 on the second surface 102 of the other solar cell 100. On the first surface 101 of a solar cell 100, A first grid lines 110 close to one side edge (i.e., the first edge 103) of the solar cell 100 are connected to each other through a first through line 131, and an end of a welding ribbon 200 is connected to a Cth grid line between the first first grid line 110 to the Ath first grid line 110, so that the carriers on the first first grid line 110 to the Ath first grid line 110 can be transmitted to the welding ribbon 200; and the end of the welding ribbon 200 is not connected to the first first grid line 110 at one side edge (i.e., the first edge 103) of the solar cell 100, so that the initial connection position of the end of the welding ribbon 200 and the solar cell 100 is close to the central area of ​​the solar cell 100, so as to avoid a large welding tension on the edge position of the solar cell 100 after the welding of the welding ribbon 200, thereby avoiding the problem of warping of the solar cell 100 caused by the tension of the welding ribbon 200. Secondly, the B+1 first grid lines 110 close to the edge of the other side of the solar cell 100 (i.e., the second edge 104) are interconnected through the second through line 132, and the middle of the welding strip 200 is connected to the ND-th first grid line 110 between the N-th first grid line 110 to the NB-th first grid line 110, so that the carriers on the N-th first grid line 110 to the NB-th first grid line 110 can be transmitted to the welding strip 200; and the middle of the welding strip 200 is not connected to the N-th first grid line 110 at the edge position of the other side of the solar cell 100 (i.e., the second edge 104), so that the connection position between the middle of the welding strip 200 and the solar cell 100 is close to the central area of ​​the solar cell 100, due to The portion of the middle of the welding ribbon 200 that is not connected to the solar cell 100 extends from the first surface 101 of one solar cell 100 to the second surface 102 of another solar cell 100. The connection between the middle of the welding ribbon 200 and the solar cell 100 is close to the central area of ​​the solar cell 100, so that the welding ribbon 200 has appropriate activity space. When two adjacent solar cells 100 move relative to each other, the portion of the middle of the welding ribbon 200 that is not connected to the solar cell 100 can bear part of the tension. Compared with the welding ribbon 200 being connected to the edge of the solar cell 100, the problem of fragmentation of the solar cell 100 due to concentrated tension between the welding ribbon 200 and the edge of the solar cell 100 can be avoided.

[0038] It should be noted that in Figure 3In the example, A is 3, B is 2, C is 2, and D is 1, which does not constitute a limitation on the values ​​of A, B, C, and D. The values ​​of A, B, C, and D can be adjusted according to the above relationship. For example, when A is 6, C can be 2, 3, 4, 5, or 6; when B is 7, D can be 1, 2, 3, 4, 5, 6, or 7. The total number N of the corresponding first gate lines 110 can be designed according to actual conditions.

[0039] In some embodiments, the solar cell 100 can be any one of a PERC cell (Passivated Emitter and Rear Cell), a PERT cell (Passivated Emitter and Rear Totally-diffused cell), a TOPCon cell (Tunnel Oxide Passivated Contact) or a HIT / HJT cell (Heterojunction Technology).

[0040] In some embodiments, the solar cell 100 can be a monocrystalline silicon solar cell, a polycrystalline silicon solar cell, an amorphous silicon solar cell or a multi-compound solar cell. The multi-compound solar cell can specifically be a cadmium sulfide solar cell, a gallium arsenide solar cell, a copper indium selenide solar cell or a perovskite solar cell.

[0041] refer to Figure 3 On the first surface 101, the first grid line 110 not connected to the first through line 131 and the second through line 132 may have a pad 111, and along the second direction Y, the width of the pad 111 is greater than the width of the first grid line 110, and the welding strip 200 is electrically connected to the corresponding first grid line 110 through the pad 111. In this way, a solar cell 100 without a main grid can be formed, and reducing the laying of the main grid line can reduce the manufacturing cost of the solar cell 100, and the design without a main grid can shorten the carrier transport path and reduce the series resistance, thereby increasing the light receiving area and improving the power of the photovoltaic module.

[0042] In some embodiments, reference Figure 3 In the first direction X, the width of the pad 111 in the second direction Y first increases and then decreases, which can help increase the contact area between the pad 111 and the solder strip 200, improve the carrier transmission efficiency, and help reduce the slurry usage cost of the pad 111.

[0043] In some embodiments, the Cth first grid line 110 has a welding portion 112, the width of the welding portion 112 is greater than the width of the first grid line 110 along the second direction Y, and the welding portion 112 is connected to the end of the welding strip 200; and / or the NDth first grid line 110 has a welding portion 112, the width of the welding portion 112 is greater than the width of the first grid line 110, and the welding portion 112 is connected to the middle of the welding strip 200. The welding portion 112 can improve the welding tension and carrier transmission efficiency between the Cth first grid line 110 and / or the NDth first grid line 110 and the welding strip 200, so that the first first grid line 110 to the Ath first grid line 110 and the Nth first grid line 110 to the NBth first grid line 110 can all perform effective electrical transmission with the welding strip 200.

[0044] In the first direction X, the width of the welding portion 112 in the second direction Y first increases and then decreases, which can help increase the contact area between the welding portion 112 and the welding strip 200, improve the carrier transmission efficiency, and help reduce the slurry usage cost of the welding portion 112.

[0045] Figure 5 A top view corresponding to the first surface of another photovoltaic assembly provided in an embodiment of the present application.

[0046] refer to Figure 5 In some embodiments, along the first direction X, a portion of the soldering ribbons 200 are connected to the Cth first grid line 110 through the first penetration wires 131, and another portion of the soldering ribbons 200 are directly connected to the Cth first grid line 110. In this way, the number of the first penetration wires 131 can be reduced to reduce the slurry usage cost of the first penetration wires 131, and the connection between the first penetration wires 131 and the soldering ribbons 200 can help reduce the length of the carrier transmission path and improve the efficiency of carrier transmission.

[0047] In some embodiments, the end of the welding ribbon 200 connected to the Cth first gate line 110 through the first penetration line 131 may be located at the intersection of the Cth first gate line 110 and the first penetration line 131 .

[0048] In other embodiments, compared with the end of the welding ribbon 200 directly connected to the Cth first grid line 110, the end of the welding ribbon 200 connected to the Cth first grid line 110 through the first penetration line 131 is further away from the first first grid line 110. In this way, the end of a portion of the welding ribbon 200 can be further moved closer to the central area of ​​the solar cell 100, thereby reducing the welding tension generated by the welding ribbon 200 on the edge of the solar cell 100, and reducing the warping problem of the solar cell 100.

[0049] In some embodiments, A can be equal to C, so that all ends of the welding ribbons 200 can be connected to the Ath (or Cth) first grid line 110 through the first through line 131, so that all ends of the welding ribbons 200 can be far away from the edge of the solar cell 100, so as to avoid the welding tension generated by the welding ribbons 200 on the edge of the solar cell 100, causing the warping problem of the solar cell 100.

[0050] When A is equal to C, along the second direction Y, the width of the Ath (or Cth) first gate line 110 may be greater than the widths of other first gate lines 110. Since the carriers on the first first gate line 110 to the Ath (or Cth) first gate line 110 are all transmitted to the Ath (or Cth) first gate line 110 through the first penetration line 131, and then transmitted to the welding strip 200 through the Ath (or Cth) first gate line 110, the Ath (or Cth) first gate line 110 needs to bear a larger amount of carriers, and the larger width of the Ath (or Cth) first gate line 110 is beneficial to reducing the internal resistance and improving the carrier transmission efficiency.

[0051] In some embodiments, the width of the first through-line 131 along the first direction X is greater than the width of the first gate line 110 along the second direction Y. The first through-line 131 is used to connect multiple first gate lines 110. The larger width of the first through-line 131 is beneficial to reducing the internal resistance of the first through-line 131 and improving the transmission efficiency of carriers.

[0052] In some embodiments, along the first direction X, the ratio of the width of the first through line 131 to the width of the solder strip 200 is 0.8 to 1.2, for example, 0.8, 0.9, 1, 1.1 or 1.2. In this way, the width of the first through line 131 is close to the width of the solder strip 200, which is beneficial to reduce the internal resistance of the first through line 131, improve the carrier transmission efficiency, and avoid the large size of the first through line 131 to block the sunlight, thereby avoiding the reduction of the light conversion efficiency of the solar cell 100.

[0053] refer to Figure 5 In some embodiments, along the first direction X, a portion of the soldering tape 200 is connected to the ND-th first grid line 110 through the second through-wire 132, and another portion of the soldering tape 200 is directly connected to the ND-th first grid line 110. In this way, the number of the second through-wires 132 can be reduced to reduce the slurry usage cost of the second through-wires 132, and the connection between the second through-wires 132 and the soldering tape 200 can help reduce the length of the carrier transmission path and improve the efficiency of carrier transmission.

[0054] In some embodiments, a welding point corresponding to the welding ribbon 200 connected to the ND-th first gate line 110 through the second through-line 132 is located at an intersection of the second through-line 132 and the ND-th first gate line 110 .

[0055] In other embodiments, compared with the welding points corresponding to the welding ribbon 200 directly connected to the ND-th first grid line 110, the welding points corresponding to the welding ribbon 200 connected to the ND-th first grid line 110 through the second penetration line 132 are further away from the N-th first grid line 110. In this way, the connection point between the middle of the partial welding ribbon 200 and the solar cell 100 can be further moved closer to the central area of ​​the solar cell 100, thereby reducing the welding tension generated by the welding ribbon 200 on the edge of the solar cell 100, and reducing the warping problem of the solar cell 100.

[0056] In some embodiments, B can be equal to D, so that the middle parts of all the welding ribbons 200 can be connected to the ND (or NB) first grid line 110 through the second through line 132, so that the middle parts of all the welding ribbons 200 can be far away from the edge of the solar cell 100, so as to avoid the welding tension generated by the welding ribbon 200 on the edge of the solar cell 100, causing the warping problem of the solar cell 100.

[0057] When B can be equal to D, the width of the NDth (or NBth) first grid line 110 can be greater than the widths of other first grid lines 110 along the second direction Y. Since the carriers on the Nth first grid line 110 to the NDth (or NBth) first grid line 110 are all transmitted to the NDth (or NBth) first grid line 110 through the second penetration line 132, and then transmitted to the welding strip 200 through the NDth (or NBth) first grid line 110, the NDth (or NBth) first grid line 110 needs to bear a large amount of carriers, and the larger width of the NDth (or NBth) first grid line 110 is conducive to reducing the internal resistance and improving the carrier transmission efficiency.

[0058] In some embodiments, the width of the second through-line 132 along the first direction X is greater than the width of the first gate line 110 along the second direction Y. The second through-line 132 is used to connect multiple first gate lines 110. The larger width of the second through-line 132 is beneficial to reducing the internal resistance of the second through-line 132 and improving the transmission efficiency of carriers.

[0059] In some embodiments, along the first direction X, the ratio of the width of the second through line 132 to the width of the solder strip 200 is 0.8 to 1.2, for example, 0.8, 0.9, 1, 1.1 or 1.2. In this way, the width of the second through line 132 is close to the width of the solder strip 200, which is beneficial to reduce the internal resistance of the second through line 132, improve the carrier transmission efficiency, and avoid the second through line 132 being too large to block sunlight, thereby avoiding the reduction of the light conversion efficiency of the solar cell 100.

[0060] In some embodiments, along the second direction Y, the length of the first penetration line 131 is greater than or equal to the length of the second penetration line 132. In this way, compared with the ND first grid line connected to the middle of the soldering ribbon 200, the C first grid line 110 connected to the end of the soldering ribbon 200 can be closer to the central area of ​​the solar cell 100. The end of the soldering ribbon 200 is more likely to have thermal expansion and contraction compared to the middle part, resulting in the warping or desoldering of the solar cell 100. The end of the soldering ribbon 200 is farther away from the edge of the solar cell 100 to minimize such problems.

[0061] Figure 6 A top view corresponding to the first surface of another photovoltaic assembly provided in an embodiment of the present application.

[0062] refer to Figure 6 In some embodiments, the photovoltaic module may include: glue points 113, the glue points 113 are located on the first surface 101, the welding ribbon 200 is fixed to the first surface 101 through a plurality of glue points 113, and the end of the welding ribbon 200 connected to the first penetration line 131 is fixed to the first penetration line 131 through the glue points 113. When the welding ribbon 200 is a low-temperature welding ribbon, after the welding ribbon 200 is fixed to the first surface 101 of the solar cell 100 through the glue points 113, the subsequent lamination process can be used to weld the welding ribbon 200 to the first grid line 110 on the first surface 101, so as to avoid the problems of stress warping, hidden cracks or broken pieces of the cell caused by high-temperature process welding.

[0063] The end of the soldering ribbon 200 is fixed to the first through line 131 by the glue point 113, that is, the glue point 113 is located between the first through line 131 and the soldering ribbon 200. Since the glue point 113 is fluid, the first through line 131 can drain the glue point 113 to prevent the glue point 113 from flowing to other areas of the first surface 101 of the solar cell 100, thereby improving the stability of the soldering ribbon 200 fixed by the glue point 113. At the same time, since the first through line 131 connects multiple first grid lines 110, the soldering ribbon 200 can still obtain the corresponding carriers on the first first grid line 110 to the Ath first grid line 110. Similarly, the middle part of the soldering ribbon 200 connected to the second through line 132 can be fixed to the second through line 132 by the glue point 113.

[0064] In some embodiments, on any soldering ribbon 200, the number of glue dots 113 in the direction from the center of the first surface 101 to the first through line 131 is the first glue dot number, and the number of glue dots 113 in the direction from the center of the first surface 101 to the second through line 132 is the second glue dot number, and the first glue dot number is greater than the second glue dot number. Since the end of the soldering ribbon 200 is located on the side close to the first through line 131, and the middle of the soldering ribbon 200 is located on the side close to the second through line 132, the middle of the soldering ribbon 200 is affected by the downward pressure of another solar cell 100 and the rigidity of the soldering ribbon 200 itself, resulting in the end of the soldering ribbon 200 being more likely to fall off from the glue dots 113. Arranging more glue dots 113 on the side close to the end of the soldering ribbon 200 is conducive to improving the stability of the soldering ribbon 200.

[0065] In some embodiments, the glue point 113 that fixes the end of the welding ribbon 200 to the first through line 131 is located between the first first grid line 110 to the Ath first grid line 110. In this way, after the end of the welding ribbon 200 is fixed on the first through line 131, the rest of the welding ribbon 200 can contact the part of the first through line 131 that is not covered by the glue point 113, which is conducive to increasing the transmission path of the carrier and improving the transmission efficiency of the carrier. Similarly, the glue point 113 that fixes the middle part of the welding ribbon 200 to the second through line 132 is located between the Nth first grid line 110 to the NBth first grid line 110.

[0066] refer to Figure 4 , the second surface 102 of the solar cell 100 is also provided with penetration lines 130, and the penetration lines 130 include a third penetration line 133 and a fourth penetration line 134. The third penetration line 133 connects the first second grid line 120 to the Eth second grid line 120 arranged along the second direction Y, where E is a positive integer greater than or equal to 2. Specifically, the third penetration line 133 connects the first second grid line 120 to the Eth second grid line 120 in the direction from the first edge 103 to the second edge 104 of the solar cell 100. The fourth penetration line 134 connects the Mth second grid line 120 to the MFth second grid line 120 arranged along the second direction Y, where F is a positive integer greater than or equal to 1. Specifically, the fourth penetration line 134 connects the first second grid line 120 to the F+1th second grid line 120 in the direction from the second edge 104 to the first edge 103 of the solar cell 100. The second end of the welding strip 200 is connected to the Gth to MHth second gate lines 120 arranged along the second direction Y, G is a positive integer greater than 1 and less than or equal to E, and H is a positive integer greater than or equal to 1 and less than or equal to F.

[0067] Combined with reference Figures 1 to 4, when the first edge 103 of one solar cell 100 is arranged adjacent to the second edge 104 of the other solar cell 100 in two adjacent solar cells 100, the welding strip 200 extends from the first surface 101 of the one solar cell 100 to the second surface 102 of the other solar cell 100. On the second surface 102 of the solar cell 100, the E second grid lines 120 close to the edge of one side of the other connected solar cell 100 (i.e., the first edge 103) are connected to each other through the third through line 133, and the middle of the welding strip 200 is connected to the Gth second grid line 120 between the first second grid line 120 to the Eth second grid line 120, so that the carriers on the first second grid line 120 to the Eth second grid line 120 can be transmitted to the welding strip 200; and the middle of the welding strip 200 is not connected to the first second grid line 120 at the edge position (i.e., the first edge 103) of the solar cell 100, so that the middle of the welding strip 200 is connected to the solar cell 100. The connection position of the battery 100 is close to the middle area of ​​the solar cell 100. After the portion of the middle part of the welding ribbon 200 that is not connected to the solar cell 100 extends from the first surface 101 of a solar cell 100 to the second surface 102 of the solar cell 100, the middle part of the welding ribbon 200 can have appropriate activity space. When relative movement occurs between two adjacent solar cells 100, the portion of the middle part of the welding ribbon 200 that is not connected to the solar cell 100 can bear part of the tension. Compared with the welding ribbon 200 being connected at the edge of the solar cell 100, the problem of fragmentation of the solar cell 100 due to concentrated tension between the welding ribbon 200 and the edge of the solar cell 100 can be avoided. A plurality of second grid lines 120 away from a side edge (i.e., the second edge 104) of another connected solar cell 100 are interconnected through a fourth through line 134, and an end of a welding ribbon 200 is connected to the MHth second grid line 120 between the Mth second grid line 120 to the MFth second grid line 120, so that the carriers on the Mth second grid line 120 to the MFth second grid line 120 can be transmitted to the welding ribbon 200; and the end of the welding ribbon 200 is not connected to the Mth second grid line 120 at the edge position (i.e., the second edge 104) of the solar cell 100, so that the final connection position of the end of the welding ribbon 200 is close to the middle area of ​​the solar cell 100, so as to avoid a large welding tension on the edge position of the solar cell 100 after the welding of the welding ribbon 200, thereby avoiding the warping problem of the solar cell 100 caused by the tension of the welding ribbon 200.

[0068] It should be noted that in Figure 4In the example, taking E as 3, F as 2, G as 2, and H as 1 does not constitute a limitation on the values ​​of E, F, G, and H, and the values ​​of E, F, G, and H can be adjusted according to the above relationship. For example, when E is 6, G can be 2, 3, 4, 5, or 6; when F is 7, H can be 1, 2, 3, 4, 5, 6, or 7. The total number M of the corresponding second gate lines 120 can be designed according to actual conditions.

[0069] The same or corresponding parts of the second gate line 120 and the first gate line 110 in the above embodiment can refer to the above contents.

[0070] Since the third through line 133 and the second through line 132 are both located in the middle of the soldering ribbon 200, the design of the third through line 133 can refer to the design of the second through line 132 in the aforementioned embodiment. Since the fourth through line 134 and the first through line 131 are both located at the ends of the soldering ribbon 200, the design of the fourth through line 134 can refer to the design of the first through line 131 in the aforementioned embodiment.

[0071] In some embodiments, glue dots 113 may also be disposed on the second surface 102 , and the manner of disposing the glue dots 113 may refer to the manner of disposing the glue dots 113 on the first surface 101 .

[0072] refer to Figure 2 In some embodiments, the photovoltaic module further includes an encapsulation layer 300, which covers the surface of the solar cell 100. The material of the encapsulation layer 300 can be an organic encapsulation film such as ethylene-vinyl acetate copolymer (EVA) film, polyethylene octene co-elastomer (POE) film or polyvinyl butyral (PVB) film.

[0073] refer to Figure 2 In some embodiments, the photovoltaic module further includes a cover plate 400, and the cover plate 400 includes a first cover plate 401 and a second cover plate 402. The first cover plate 401 covers the surface of the encapsulation layer 300 away from the first surface 101 of the solar cell 100, and the second cover plate 402 covers the surface of the encapsulation layer 300 away from the second surface 102 of the solar cell 100. The cover plate 400 can be a glass cover plate, a plastic cover plate, or the like with a light-transmitting function. In some embodiments, the surface of the first cover plate 401 and / or the second cover plate 402 facing the encapsulation layer 300 can be a concave-convex surface, so as to increase the utilization rate of the incident light.

[0074] In the photovoltaic module provided in the embodiment of the present application, the welding ribbon 200 connects two adjacent solar cells 100 to form a cell string, the first end of the welding ribbon 200 is connected to the first grid line 110 on the first surface 101 of one solar cell 100, and the second end of the welding ribbon 200 is connected to the second grid line 120 on the second surface 102 of another solar cell 100. On the first surface 101 of a solar cell 100, A first grid lines 110 close to the edge of one side of the solar cell 100 (i.e., the first edge 103) are connected to each other through the first through line 131, and the end of the welding ribbon 200 is connected to the Cth grid line between the first first grid line 110 to the Ath first grid line 110, so that the carriers on the first first grid line 110 to the Ath first grid line 110 can all be connected.

[0075] JKS-20240594&0595-241689CN-CH-I is transferred to the welding ribbon 200; and the end of the welding ribbon 200 is not connected to the first first grid line 110 at one side edge (i.e., the first edge 103) of the solar cell 100, so that the initial connection position where the end of the welding ribbon 200 is connected to the solar cell 100 is close to the central area of ​​the solar cell 100, so as to avoid a large welding tension on the edge position of the solar cell 100 after the welding of the welding ribbon 200, thereby avoiding the warping problem of the solar cell 100 caused by the tension of the welding ribbon 200. Secondly, the B+1 first grid lines 110 close to the edge of the other side of the solar cell 100 (i.e., the second edge 104) are interconnected through the second through line 132, and the middle of the welding strip 200 is connected to the ND-th first grid line 110 between the N-th first grid line 110 to the NB-th first grid line 110, so that the carriers on the N-th first grid line 110 to the NB-th first grid line 110 can be transmitted to the welding strip 200; and the middle of the welding strip 200 is not connected to the N-th first grid line 110 at the edge position of the other side of the solar cell 100 (i.e., the second edge 104), so that the connection position between the middle of the welding strip 200 and the solar cell 100 is close to the central area of ​​the solar cell 100, due to The portion of the middle of the welding ribbon 200 that is not connected to the solar cell 100 extends from the first surface 101 of one solar cell 100 to the second surface 102 of another solar cell 100. The connection between the middle of the welding ribbon 200 and the solar cell 100 is close to the central area of ​​the solar cell 100, so that the welding ribbon 200 has appropriate activity space. When two adjacent solar cells 100 move relative to each other, the portion of the middle of the welding ribbon 200 that is not connected to the solar cell 100 can bear part of the tension. Compared with the welding ribbon 200 being connected to the edge of the solar cell 100, the problem of fragmentation of the solar cell 100 due to concentrated tension between the welding ribbon 200 and the edge of the solar cell 100 can be avoided.

[0076] Those skilled in the art will appreciate that the above-mentioned embodiments are specific examples for implementing the present application, and in practical applications, various changes may be made to the embodiments in form and detail without departing from the spirit and scope of the present application. Any person skilled in the art may make various changes and modifications without departing from the spirit and scope of the present application, and therefore the scope of protection of the present application shall be subject to the scope defined in the claims.

Claims

1. A photovoltaic module, characterized in that: include: A solar cell, the solar cell having a first surface and a second surface opposite to each other, the first surface of the solar cell being provided with N first grid lines extending along a first direction, the first grid lines being arranged at intervals along a second direction, and the second surface of the solar cell being provided with second grid lines; the first surface of the solar cell being provided with through lines, the through lines comprising a first through line and a second through line, the first through line connecting the first first grid line to the Ath first grid line arranged along the second direction, A being a positive integer greater than or equal to 2; the second through line connecting the Nth first grid line to the NBth first grid line arranged along the second direction, and B being a positive integer greater than or equal to 1; A welding strip, one end of which is connected to the Cth first grid line to the NDth first grid line arranged along the second direction, C is a positive integer greater than 1 and less than or equal to A, D is a positive integer greater than or equal to 1 and less than or equal to B, and the other end of the welding strip is connected to the second grid line of another solar cell.

2. The photovoltaic module according to claim 1, characterized in that: Along the first direction, a portion of the welding strips are connected to the Cth first gate line through the first penetration line, and another portion of the welding strips are directly connected to the Cth first gate line.

3. The photovoltaic module according to claim 2, characterized in that: Compared with the end of the welding strip directly connected to the Cth first gate line, the end of the welding strip connected to the Cth first gate line through the first penetration line is farther away from the first first gate line.

4. The photovoltaic module according to claim 1, characterized in that: In the first direction, a ratio of a width of the first penetration line to a width of the welding strip is 0.8 to 1.

2.

5. The photovoltaic module according to claim 1, characterized in that: The first gate line not connected to the first through line and the second through line has a pad, the width of the pad is greater than the width of the first gate line along the second direction, and the welding strip is connected to the pad.

6. The photovoltaic module according to claim 5, characterized in that: The Cth first gate line has a welding portion, and along the second direction, the width of the welding portion is greater than the width of the first gate line, and the welding portion is connected to the welding strip; and / or the NDth first gate line has the welding portion, and the welding portion is connected to the welding strip.

7. The photovoltaic module according to claim 1, characterized in that: Along the second direction, the length of the first penetration line is greater than or equal to the length of the second penetration line.

8. The photovoltaic module according to claim 1, characterized in that: Also includes: Glue dots, the glue dots are located on the first surface, the soldering tape is fixed to the first surface through a plurality of the glue dots, and the end of the soldering tape connected to the first through line is fixed to the first through line through the glue dots.

9. The photovoltaic module according to claim 8, characterized in that: On any of the welding strips, the number of glue dots in the direction from the center of the first surface to the first through line is a first number of glue dots, and the number of glue dots in the direction from the center of the first surface to the second through line is a second number of glue dots, and the first number of glue dots is greater than the second number of glue dots.

10. The photovoltaic module according to claim 8, characterized in that: The glue point for fixing the end of the welding strip to the first through line is located between the first first grid line to the Ath first grid line.

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