Photovoltaic module

Abstract

The utility model discloses a photovoltaic assembly, comprising a battery piece and a solder strip, the front and back surfaces of the battery piece are both provided with a plurality of main grids, the main grids extend along a first direction, the plurality of main grids are arranged at intervals along a second direction, the second direction is vertical to the first direction, and the solder strip is arranged on the first direction. At least the front face of the battery piece is not provided with an auxiliary grid extending in the second direction, the welding strips extend in the first direction, the number of the welding strips is multiple, the welding strips and the multiple main grids are arranged in a one-to-one correspondence mode, the welding strips are connected with the corresponding main grids, and the welding strips are further connected with the battery piece through colloid. According to the photovoltaic module provided by the utility model, the resistance loss can be reduced, the manufacturing cost is reduced, and the photovoltaic module has better welding pull-out force and better reliability.

Description

Technical Field

[0001] The utility model relates to the technical field of photovoltaics, in particular to a photovoltaic component. Background Art

[0002] Solar cells are the core components of photovoltaic modules. The main function of solar cells is to convert solar energy into electrical energy. When sunlight shines on the solar cells, the semiconductor material in the solar cells absorbs the energy of photons, causing electrons to transition, thereby generating current and voltage. Grid lines are distributed on the solar cells, and the grid lines can collect the photocurrent generated by the solar cells under light. The grid lines are divided into main grids and auxiliary grids. In order to save the manufacturing cost of the grid lines, the main grids in related technologies have developed from multi-main grids to super-multi-main grids. The widths of the main grids and auxiliary grids will become thinner, which will help reduce the amount of silver paste used in the main grids and auxiliary grids and reduce the paste cost. However, due to the thinning of the grid line width, the contact resistance will increase, and it will make the welding of the welding strips more difficult and the welding pull-off force will decrease, affecting the reliability of the photovoltaic module. Utility Model Content

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention provides a photovoltaic module that can reduce resistance loss and manufacturing costs and has good welding pull-off strength.

[0004] According to an embodiment of the present invention, the photovoltaic module includes a cell and a welding strip, the front and back sides of the cell have multiple main grids, the main grids extend along a first direction, and the multiple main grids are arranged at intervals along a second direction, the second direction is perpendicular to the first direction, at least the front side of the cell does not have a secondary grid extending along the second direction, the welding strip extends along the first direction, there are multiple welding strips and they are arranged one-to-one with the multiple main grids, the welding strips are connected to the corresponding main grids, and the welding strips are also connected to the cell through a colloid.

[0005] According to the photovoltaic module of the present invention, since at least the front surface of the cell does not have a secondary grid, and the welding ribbon extends in the same direction as the main grid, the photocurrent of the cell can flow only along the extension direction of the welding ribbon, eliminating the transmission process perpendicular to the welding ribbon, thereby reducing resistance loss. Moreover, by eliminating the secondary grid, the light-receiving area of ​​the cell can be increased, the photoelectric conversion efficiency of the cell can be improved, the manufacturing cost of the secondary grid can be reduced, and the problem of increased contact resistance caused by the excessive width of the secondary grid can be solved. In addition, since the welding ribbon is connected to the cell through the colloid in addition to the main grid, the welding pull-off force of the photovoltaic module is increased, thereby improving the reliability of the photovoltaic module. Moreover, due to the increased welding pull-off force of the photovoltaic module, both the main grid and the welding ribbon can be further thinned, thereby further reducing material costs, further increasing the light-receiving area of ​​the cell, and improving the photoelectric conversion efficiency of the cell.

[0006] In some embodiments, the width of the welding strip covers the width of the main grid; the length of the welding strip covers more than 80% of the length of the main grid.

[0007] In some embodiments, the portion of the colloid connected to the welding ribbon is sandwiched between the welding ribbon and the battery cell; or, the portion of the welding ribbon connected to the colloid is sandwiched between the battery cell and the colloid, and the portion of the colloid extending beyond the welding ribbon is connected to the battery cell.

[0008] In some embodiments, the colloid is in a dot shape, and a plurality of the colloids are distributed on a single welding strip and spaced apart along the first direction.

[0009] In some embodiments, the colloids on the adjacent solder strips are aligned; or the colloids on the adjacent solder strips are staggered.

[0010] In some embodiments, the colloid is formed into a strip extending along the first direction, each soldering strip corresponds to a strip of the colloid, and the colloid extends along the first direction to a length exceeding 30% of the length of the soldering strip.

[0011] In some embodiments, the width of the colloid in the second direction is greater than the width of the solder strip in the second direction, and the difference between the width of the colloid and the width of the solder strip is 0.1 mm-0.5 mm.

[0012] In some embodiments, the colloid is formed into a strip extending along the second direction, each of the colloids intersects with a plurality of the solder strips arranged at intervals, and the solder strips intersect with a plurality of the colloids arranged at intervals along the first direction.

[0013] In some embodiments, the width of the colloid in the first direction is 0.2 mm-1 mm; and 2-7 colloids are arranged at intervals along the first direction.

[0014] In some embodiments, the spacing between adjacent main grids is 0.85 mm to 4.2 mm, the width of the main grid is 10 um to 30 um, and the width of the welding strip is 30 um to 220 um.

[0015] Additional aspects and advantages of the present invention will be given in part in the following description and will become apparent from the following description or learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a schematic diagram of a battery cell according to an embodiment of the present utility model;

[0017] Figure 2 is a schematic diagram of a photovoltaic module according to one embodiment of the present utility model;

[0018] Figure 3 is a schematic diagram of a photovoltaic assembly according to another embodiment of the present invention;

[0019] Figure 4 is a schematic diagram of a photovoltaic assembly according to another embodiment of the present utility model;

[0020] Figure 5 Schematic diagram of a photovoltaic module according to another embodiment of the present invention.

[0021] Reference numerals: photovoltaic module 100 ; cell 1 ; main grid 11 ; welding ribbon 2 ; first welding ribbon 21 ; second welding ribbon 22 ; colloid 3 ; first direction F1 ; second direction F2 . DETAILED DESCRIPTION

[0022] The following describes in detail embodiments of the present invention, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to explain the present invention, and should not be construed as limiting the present invention.

[0023] The disclosure below provides many different embodiments or examples for realizing different structures of the present invention. In order to simplify the disclosure of the present invention, the components and settings of specific examples are described below. Of course, they are merely examples and are not intended to limit the present invention. In addition, the present invention may repeat reference numbers and / or letters in different examples. This repetition is for the purpose of simplicity and clarity and does not in itself indicate the relationship between the various embodiments and / or settings discussed. In addition, the present invention provides examples of various specific processes and materials, but a person of ordinary skill in the art will appreciate the applicability of other processes and / or the use of other materials.

[0024] Solar cells are the core components of photovoltaic modules. Their primary function is to convert solar energy into electrical energy. When sunlight strikes a cell, the semiconductor material within it absorbs the energy of photons, causing electrons to transition, generating current and voltage. Grid lines are distributed across the cell, collecting the photocurrent generated by the cell when exposed to sunlight. Grid lines are divided into main grids and secondary grids. The main grid and secondary grids are arranged perpendicularly. Typically, the secondary grids are thinner and more numerous than the main grids. They are distributed across the surface of the cell, collecting the photocurrent and transmitting it to the main grid lines. The main grids are thicker and less numerous than the secondary grids, converging the current from the cell onto the photovoltaic ribbons. PV ribbons are used to connect multiple cells in series or parallel in a photovoltaic module. PV ribbons are divided into interconnecting ribbons and busbars. Interconnecting ribbons connect the cells, collecting and transmitting the cell current. Busbars collect the current generated by the cell string and direct it to the junction box.

[0025] The commonly used method for producing grid lines currently involves printing a metal paste (such as silver paste) onto the cell surface to form a grid line pattern. As busbars in related technologies evolve from multi-busbars to ultra-multi-busbars, the widths of the busbars and sub-busbars decrease. This reduces the amount of silver paste used for both, lowering the cost of the paste. However, the thinning of the grid lines increases contact resistance, makes soldering the ribbons more difficult, and reduces the pull-off strength, impacting the reliability of the photovoltaic module.

[0026] In order to solve at least one of the above technical problems, the present application proposes a photovoltaic module 100. The photovoltaic module 100 according to an embodiment of the present invention is described below with reference to the accompanying drawings.

[0027] like Figure 1 and Figure 2As shown, a photovoltaic module 100 includes a cell 1 and a welding ribbon 2. Multiple busbars 11 are provided on both the front and back sides of the cell 1. The busbars 11 extend along a first direction F1 and are spaced apart along a second direction F2, which is perpendicular to the first direction F1. At least the front side of the cell 1 does not have a secondary grid extending along the second direction F2. Multiple welding ribbons 2 extend along the first direction F1, and are arranged one-to-one with each of the multiple busbars 11. The welding ribbons 2 are connected to the corresponding busbars 11 and are also connected to the cell 1 via a colloid 3.

[0028] Among them, "there are multiple welding strips 2 and they are arranged one-to-one with multiple main grids 11" means: the number of welding strips 2 is the same as the number of main grids 11, each welding strip 2 corresponds to a main grid 11, and the corresponding welding strips 2 and main grids 11 are arranged in the same position in the second direction F2 and both extend along the first direction F1.

[0029] Here, "at least the front side of the cell 1 does not have a secondary grid extending along the second direction F2" means that the cell 1 may not have a secondary grid extending along the second direction F2 on only the front side, or the cell 1 may not have a secondary grid extending along the second direction F2 on both the front and back sides. Therefore, the designs of the front and back sides of the cell 1 may be the same or different. To simplify the description, the following description will take the case where the designs of the front and back sides of the cell 1 are the same as an example. It is understandable that the front and back sides of the cell 1 refer to the two sides of the thickness of the cell 1, the front side of the cell 1 being the side of the cell 1 facing the sun, and the back side of the cell 1 being the side facing away from the sun.

[0030] Illustratively, the main grid 11 may be a metallized grid line, and the welding strip 2 is an interconnection welding strip, and is welded to the main grid 11 .

[0031] Thus, because at least the front surface of the cell 1 lacks a secondary grid, and the soldering ribbon 2 extends in the same direction as the main grid 11, the photocurrent of the cell 1 can flow only along the extension direction of the soldering ribbon 2, eliminating the transmission process perpendicular to the soldering ribbon 2, thereby reducing resistance losses. Furthermore, by eliminating the secondary grid, the light-receiving area of ​​the cell 1 can be increased, improving the photoelectric conversion efficiency of the cell 1, reducing the manufacturing cost of the secondary grid, and solving the problem of increased contact resistance caused by excessively narrow secondary grids. Furthermore, because the soldering ribbon 2 is connected to the cell 1 through the colloid 3 in addition to being connected to the main grid 11, the soldering pull-off force of the photovoltaic module 100 is increased, improving the reliability of the photovoltaic module 100. Furthermore, due to the increased soldering pull-off force of the photovoltaic module 100, both the main grid 11 and the soldering ribbon 2 can be further thinned, thereby further reducing material costs, further increasing the light-receiving area of ​​the cell 1, and improving the photoelectric conversion efficiency of the cell 1.

[0032] For example, Figure 1 and Figure 2 As shown, the front side of the cell 1 has multiple busbars 11, each extending along a first direction F1. The multiple busbars 11 are evenly spaced along a second direction F2. The front side of the cell 1 has no secondary grids perpendicular to the busbars 11. The back side of the cell 1 also has multiple busbars 11, each extending along the first direction F1. The multiple busbars 11 are evenly spaced along the second direction F2. The back side of the cell 1 also has no secondary grids perpendicular to the busbars 11. Each busbar 11 is connected to a welding ribbon 2, which also extends along the first direction F1. That is, the busbar 11 extends along the direction in which the welding ribbon 2 extends. This allows the welding ribbon 2 to be connected to the busbar 11 along its entire length, increasing the electrical connection area between the busbar 11 and the welding ribbon 2. This allows the photogenerated current of the cell 1 to flow only along the first direction F1, eliminating the need for current transmission along the second direction F2 and minimizing resistance losses. Moreover, the welding strip 2 can cover the main grid 11 to a large extent, thereby having a higher tolerance to breakage, cracking, and hidden cracks of the main grid 11, thereby improving the reliability of the photovoltaic module 100, which is conducive to further reducing the width of the main grid 11 and reducing material costs.

[0033] For example, the photovoltaic module 100 may include a plurality of cells 1, and the welding strip 2 connects the main grids 11 of two adjacent cells 1 to realize the series or parallel connection of the plurality of cells 1 through the welding strip 2. Figure 2 The welding strip 2 includes a first welding strip 221 and a second welding strip 222. The first welding strip 221 is used to connect the main grid 11 on the front side of the battery cell 1 and the battery cell adjacent to the battery cell 1 (for example Figure 2 The main grid on the front of the cell 1) is located below the cell 1, and the second welding strip 222 is used to connect the main grid 11 on the back of the cell 1 and another cell adjacent to the cell 1 (for example Figure 2 The main grid on the back of the cell 1) is located above the cell 1.

[0034] In some embodiments of the present invention, the width of the welding ribbon 2 overlaps the width of the main grid 11. The width of the welding ribbon 2 refers to the size of the welding ribbon 2 in the second direction F2, and the width of the main grid 11 refers to the size of the main grid 11 in the second direction F2. Taking the front or back of the solar cell 1 as the projection surface, the width of the main grid 11 on the projection surface does not exceed the width of the main grid 11 on the projection surface. In other words, the projection of the main grid 11 along the second direction F2 does not exceed the projection range of the welding ribbon 2. This helps to increase the connection area between the main grid 11 and the welding ribbon 2, and has a higher tolerance for broken grids, cracks, and hidden cracks in the main grid 11, which helps to improve the reliability of the photovoltaic module 100.

[0035] In some embodiments of the present invention, the length of the welding ribbon 2 covers more than 80% of the length of the busbar 11. The length of the welding ribbon 2 refers to its dimension along the first direction F1, and the length of the busbar 11 refers to its dimension along the first direction F1. Taking the front or back of the cell 1 as the projection surface, the orthographic projection of the welding ribbon 2 on the projection surface covers more than 80% of the length of the busbar 11. This helps increase the connection area between the busbar 11 and the welding ribbon 2, improves tolerance for breakage, cracking, and hidden cracks in the busbar 11, and improves the reliability of the photovoltaic module 100.

[0036] In some embodiments of the present invention, the spacing between adjacent busbars 11 is 0.85 mm to 4.2 mm; the width of the busbars 11 is 10 μm to 30 μm, and the width of the soldering ribbon 2 is 30 μm to 220 μm. That is, the spacing between two adjacent busbars 11 along the second direction F2 is any value between 0.85 mm and 4.2 mm, such as 0.85 mm, 1 mm, 2 mm, 3 mm, 4 mm, 4.2 mm, and so on. The width of the busbars 11 along the second direction F2 is any value between 10 μm and 30 μm, such as 10 μm, 15 μm, 20 μm, 25 μm, 30 μm, and so on. The width of the soldering ribbon 2 along the second direction F2 is any value between 30 μm and 220 μm, such as 30 μm, 60 μm, 90 μm, 120 μm, 150 μm, 180 μm, 220 μm, and so on.

[0037] As a result, the relatively small widths of both the busbar 11 and the soldering ribbon 2 help reduce material costs and allow the cell 1 to have a larger light-receiving area, thereby improving the photovoltaic module 100's photoelectric conversion efficiency. Furthermore, this facilitates the arrangement of a larger number of busbars 11, thereby enhancing current transmission efficiency. Furthermore, the soldering ribbon 2 is wide enough to cover the width of the busbar 11, thereby increasing the connection area between the busbar 11 and the soldering ribbon 2. Furthermore, the busbar 11 is more tolerant to breakage, cracking, and hidden cracks, thereby improving the reliability of the photovoltaic module 100.

[0038] In some embodiments of the present invention, the portion of the colloid 3 connected to the soldering ribbon 2 is sandwiched between the soldering ribbon 2 and the cell 1. That is, the colloid 3 is preferentially placed on the cell 1, and then the soldering ribbon 2 is soldered to the cell 1. For example, before soldering the soldering ribbon 2 and the cell 1, a layer of glue may be printed on the cell 1, and then the soldering ribbon 2 and the cell 1 may be soldered. At this time, the surface of the glue facing the cell 1 is connected to the cell 1, and the surface of the glue facing the soldering ribbon 2 is connected to the soldering ribbon 2, so that the soldering ribbon 2 is also connected to the cell 1 through the printed glue layer (i.e., the colloid 3), thereby increasing the pull-out force performance of the photovoltaic module 100 and improving the reliability of the photovoltaic module 100.

[0039] Alternatively, in some other embodiments of the present invention, the portion of the soldering ribbon 2 connected to the colloid 3 is sandwiched between the cell 1 and the colloid 3, and the portion of the colloid 3 that extends beyond the soldering ribbon 2 is connected to the cell 1. In other words, the soldering ribbon 2 is first soldered to the cell 1, and then the colloid 3 is placed on the soldering ribbon 2 and connected to the cell 1. For example, the soldering ribbon 2 and the cell 1 are first soldered, and then a layer of glue is printed on the cell 1 to which the soldering ribbon 2 is soldered. The portion of the soldering ribbon 2 covered by the glue is connected to the soldering ribbon 2, and the portion of the glue that extends beyond the soldering ribbon 2 is connected to the cell 1. This allows the soldering ribbon 2 to also be connected to the cell 1 through the printed glue layer (i.e., the colloid 3), thereby increasing the pull-out strength performance of the photovoltaic module 100 and improving the reliability of the photovoltaic module 100.

[0040] In some embodiments of the present application, Figure 2 and Figure 3 The colloid 3 is dot-shaped, and a single soldering ribbon 2 is provided with multiple colloids 3 spaced apart along the first direction F1. For example, the colloids 3 can be first processed on the cell 1 through a process such as dispensing or printing, so that each busbar 11 is provided with multiple dot-shaped colloids 3, and then the soldering ribbon 2 is soldered to the cell 1. For another example, the soldering ribbon 2 can be first soldered to the cell 1, and then the colloids 3 can be processed on the soldering ribbon 2 through a process such as dispensing or printing, so that each soldering ribbon 2 is provided with multiple dot-shaped colloids 3, and the portion of the colloid 3 that extends beyond the soldering ribbon 2 is connected to the cell 1. Thus, providing the colloids 3 in a dot-shaped form can save material for the colloid 3 and reduce material costs. Furthermore, the connection of a single soldering ribbon 2 to the cell 1 via multiple dot-shaped colloids 3 can further increase the pull-out strength performance of the photovoltaic module 100, thereby improving the reliability of the photovoltaic module 100.

[0041] For example, in combination Figure 2 When the colloids 3 are dot-shaped and multiple colloids 3 are spaced along the first direction F1 on a single soldering ribbon 2, the colloids 3 on adjacent soldering ribbons 2 are aligned. Two aligned colloids 3 on adjacent soldering ribbons 2 lie on the same straight line extending along the second direction F2. Because multiple colloids 3 are spaced along the first direction F1 on a single soldering ribbon 2, the multiple colloids 3 on each soldering ribbon 2 are aligned one-to-one with the multiple colloids 3 on adjacent soldering ribbons 2. This facilitates the design and processing of the colloids 3, improving processing efficiency.

[0042] For example, combined with Figure 22-15 equally spaced dot-shaped colloids 3 can be printed on each main grid 11 along the first direction F1. The width of the colloid 3 in the second direction F2 is greater than the width of the soldering ribbon 2 in the second direction F2. For example, the difference between the width of the colloid 3 and the width of the soldering ribbon 2 is 0.1 mm to 0.5 mm. Thus, the width of the soldering ribbon 2 can be covered by the width of the colloid 3. As a result, the colloid 3 can more reliably connect the soldering ribbon 2 and the solar cell 1, thereby increasing the pull-off force performance of the photovoltaic module 100 and improving the reliability of the photovoltaic module 100.

[0043] For example, in combination Figure 3 When the colloids 3 are dot-shaped and multiple colloids 3 are distributed along the first direction F1 on a single solder ribbon 2, the colloids 3 on adjacent solder ribbons 2 are staggered. Specifically, two staggered colloids 3 on adjacent solder ribbons 2 cannot lie on the same straight line extending along the second direction F2. Because multiple colloids 3 are distributed along the first direction F1 on a single solder ribbon 2, the multiple colloids 3 on each solder ribbon 2 are staggered one-to-one with the multiple colloids 3 on adjacent solder ribbons 2. This helps increase the width of each colloid 3, allowing the width of the colloid 3 to cover a wider range of the solder ribbon 2. This allows the colloid 3 to more reliably connect the solder ribbon 2 to the cell 1, improving the pull-out resistance of the photovoltaic module 100 and enhancing the reliability of the photovoltaic module 100. Furthermore, by staggering the colloids 3 on adjacent solder ribbons 2, the overall force applied to the cell 1 is more uniform, making the cell 1 less susceptible to cracking and delamination, thereby improving the reliability of the photovoltaic module 100.

[0044] For example, combined with Figure 3 2-15 equally spaced dot-shaped colloids 3 can be printed on each busbar 11 along the first direction F1. The colloids 3 on adjacent busbars 11 are staggered (i.e., not on the same straight line extending along the second direction F2). For example, multiple busbars 11 are numbered sequentially along the second direction F2, with the colloids 3 on odd-numbered busbars 11 (e.g., the first busbar 11, the third busbar 11, the fifth busbar 11, etc.) aligned, and the colloids 3 on even-numbered busbars 11 (e.g., the second busbar 11, the fourth busbar 11, the sixth busbar 11, etc.) aligned, but the colloids 3 on the odd-numbered busbars 11 are staggered from those on the even-numbered busbars 11. For example, the width of the colloid 3 in the second direction F2 is greater than the width of the welding ribbon 2 in the second direction F2. For example, the difference between the width of the colloid 3 and the width of the welding ribbon 2 is 0.1 mm to 0.5 mm, so that the width of the welding ribbon 2 can be covered by the width of the colloid 3. Therefore, the colloid 3 can more reliably connect the welding ribbon 2 and the solar cell 1, thereby increasing the pull-off force performance of the photovoltaic module 100 and improving the reliability of the photovoltaic module 100.

[0045] In some embodiments of the present application, Figure 4 and Figure 5 , the colloid 3 is in the form of a strip. For example, the strip of colloid 3 can be first processed on the cell 1 by applying glue, gluing, or printing, and then the soldering ribbon 2 can be soldered to the cell 1. For another example, the soldering ribbon 2 can be soldered to the cell 1 first, and then the strip of colloid 3 can be processed on the soldering ribbon 2 by applying glue, gluing, or printing, so that the portion of the colloid 3 that protrudes from the soldering ribbon 2 is connected to the cell 1. In this way, the colloid 3 is provided in a strip shape, which facilitates the processing of the colloid 3.

[0046] For example, in combination Figure 4 The colloid 3 is formed into a strip extending along the first direction F1. Each soldering ribbon 2 corresponds to a strip of colloid 3. The colloid 3 extends along the first direction F1 to a length exceeding 30% of the length of the soldering ribbon 2. In other words, in this embodiment, the extension direction of the colloid 3 is parallel to the extension direction of the busbar 11 (i.e., the extension direction of the soldering ribbon 2). Therefore, configuring the colloid 3 as a strip extending parallel to the extension direction of the soldering ribbon 2 not only facilitates the processing of the colloid 3, but also helps to increase the ability of the colloid 3 to connect the soldering ribbon 2 to the solar cell 1, thereby further improving the pull-out strength performance of the photovoltaic module 100 and enhancing the reliability of the photovoltaic module 100.

[0047] For example, combined with Figure 4 When the length of the colloid 3 along the first direction F1 is relatively long, multiple soldering ribbons 2 can be soldered to the battery cell 1 first, and then multiple colloids 3 can be printed one-to-one on the multiple soldering ribbons 2, with the portion of the colloid 3 extending beyond the soldering ribbons 2 being connected to the battery cell 1. When the length of the colloid 3 along the first direction F1 is relatively long, printing the colloid 3 is facilitated, thereby improving the pull-off strength performance between the soldering ribbon 2 and the battery cell 1 over a larger soldering length range.

[0048] When the length of the colloid 3 along the first direction F1 is relatively short, multiple soldering ribbons 2 can be first soldered to the cell 1, and then multiple soldering ribbons 3 can be printed on the multiple soldering ribbons 2, with the portion of the soldering ribbon 3 extending beyond the soldering ribbons 2 connected to the cell 1. Alternatively, multiple soldering ribbons 3 can be first printed on multiple busbars 11, and then the multiple soldering ribbons 2 can be soldered to the cell 1. When the length of the colloid 3 along the first direction F1 is relatively short, one soldering ribbon 2 can be configured to correspond to only one colloid 3, or multiple colloids 3 can be distributed on one soldering ribbon 2 and spaced apart along the first direction F1. This can improve the pull-out strength between the soldering ribbon 2 and the cell 1 over a larger soldering length range.

[0049] For example, in combination Figure 4The width of the colloid 3 in the second direction F2 is greater than the width of the welding ribbon 2 in the second direction F2. For example, the difference between the width of the colloid 3 and the width of the welding ribbon 2 is 0.1 mm to 0.5 mm. Thus, the width of the welding ribbon 2 can be covered by the width of the colloid 3. Therefore, the colloid 3 can more reliably connect the welding ribbon 2 and the solar cell 1, thereby increasing the pull-off force performance of the photovoltaic module 100 and improving the reliability of the photovoltaic module 100.

[0050] For example, in combination Figure 5 Colloid 3 is formed into a strip extending along the second direction F2. That is, in this embodiment, the extension direction of colloid 3 is perpendicular to the extension direction of busbar 11 (i.e., the extension direction of welding ribbon 2). Each colloid 3 intersects with multiple welding ribbons 2 arranged at intervals, and welding ribbons 2 intersect with multiple colloids 3 arranged at intervals along the first direction F1. Thus, arranging colloid 3 into a strip extending perpendicular to welding ribbon 2 facilitates the processing of colloid 3. Precise positioning of colloid 3 on welding ribbon 2 is no longer necessary; simple positioning is sufficient. Furthermore, arranging welding ribbon 2 to intersect multiple colloids 3 helps increase the ability of colloid 3 to connect welding ribbon 2 to cell 1, thereby further improving the pull-out strength performance of photovoltaic module 100 and enhancing the reliability of photovoltaic module 100. Moreover, the colloid 3 is set to be a strip extending perpendicular to the welding ribbon 2, which facilitates flexible selection of the processing order of the colloid 3. The colloid 3 can be printed on the battery cell 1 first and then the welding ribbon 2 is welded, or the welding ribbon 2 can be welded first and then the colloid 3 is printed.

[0051] For example, when the length of the colloid 3 along the second direction F2 is relatively long, the colloid 3 can intersect all the solder ribbons 2 on the cell 1. For another example, when the length of the colloid 3 along the second direction F2 is relatively short, the colloid 3 can intersect some of the solder ribbons 2 on the cell 1. In this case, two colloids 3 spaced apart along the second direction F2 can be provided, with one colloid 3 intersecting with some of the solder ribbons 2 on the cell 1 and the other colloid 3 intersecting with the remaining solder ribbons 2 on the cell 1. In this way, the two colloids 3 spaced apart along the second direction F2 can intersect all the solder ribbons 2 on the cell 1. Of course, more than three colloids 3 spaced apart along the second direction F2 can also be provided, which will not be described in detail here.

[0052] For example, in combination Figure 5 The width of the colloid 3 in the first direction F1 is 0.2 mm to 1 mm, and 2 to 7 colloids 3 are spaced apart along the first direction F1. This effectively ensures the light-receiving area of ​​the cell 1 while improving the pull-out resistance of the photovoltaic module 100. For example, during processing, 2 to 7 strips of colloid 3 can be printed on the cell 1. The extension direction of the colloid 3 is perpendicular to the extension direction of the main grid 11, and the spacing direction of the multiple colloids 3 is in the extension direction of the main grid 11. The width of the colloid 3 is 0.2 mm to 1 mm.

[0053] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and features of different embodiments or examples without contradiction.

[0054] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and purpose of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A photovoltaic module, characterized in that: include: A cell, wherein both the front and back sides of the cell have a plurality of main grids, the main grids extending along a first direction, the plurality of main grids being spaced apart along a second direction, the second direction being perpendicular to the first direction, and at least the front side of the cell does not have a secondary grid extending along the second direction; A welding strip extending along the first direction, wherein the welding strip is multiple and arranged in one-to-one correspondence with the multiple main grids, the welding strip is connected to the corresponding main grids, and the welding strip is also connected to the battery cell through a colloid.

2. The photovoltaic module according to claim 1, characterized in that The width of the welding strip covers the width of the main grid; the length of the welding strip covers more than 80% of the length of the main grid.

3. The photovoltaic module according to claim 1, characterized in that The portion of the colloid connected to the soldering ribbon is sandwiched between the soldering ribbon and the battery cell; Alternatively, a portion of the soldering tape connected to the colloid is sandwiched between the battery cell and the colloid, and a portion of the colloid extending beyond the soldering tape is connected to the battery cell.

4. The photovoltaic module according to claim 1, characterized in that The colloid is in a dot shape, and a plurality of the colloids are distributed on a single welding strip and spaced apart along the first direction.

5. The photovoltaic module according to claim 4, characterized in that: The colloids on the adjacent solder strips are aligned; or the colloids on the adjacent solder strips are staggered.

6. The photovoltaic module according to claim 1, characterized in that The colloid is formed into a strip extending along the first direction. Each soldering strip corresponds to one strip of the colloid. The colloid extends along the first direction to a length exceeding 30% of the length of the soldering strip.

7. The photovoltaic module according to any one of claims 4 to 6, characterized in that: The width of the colloid in the second direction is greater than the width of the solder strip in the second direction, and the difference between the width of the colloid and the width of the solder strip is 0.1 mm-0.5 mm.

8. The photovoltaic module according to claim 1, characterized in that The colloids are formed into strips extending along the second direction. Each of the colloids intersects with a plurality of the solder strips arranged at intervals, and the solder strips intersect with a plurality of the colloids arranged at intervals along the first direction.

9. The photovoltaic module according to claim 8, characterized in that: The width of the colloid in the first direction is 0.2 mm to 1 mm; and 2 to 7 colloids are arranged at intervals along the first direction.

10. The photovoltaic module according to claim 1, characterized in that: The spacing between adjacent main grids is 0.85 mm to 4.2 mm, the width of the main grid is 10 um to 30 um, and the width of the welding strip is 30 um to 220 um.

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