Method for stringing dense grid battery cells and battery cell

Abstract

The application relates to the technical field of photovoltaic modules, and particularly discloses a stringing method of dense-grid battery pieces and a battery monomer. The stringing method of the dense-grid battery pieces comprises the following steps: connecting all the extending sections of the dense grids on one battery piece through a busbar, and realizing the electrical connection of the dense grids and the busbar, wherein the extending direction of the busbar is perpendicular to the extending direction of the dense grids. The extending sections of the dense grids are fixed to the busbar through a first adhesive film. One side of the busbar connected with the dense grids is placed on the side of another battery piece with main grids. A solder strip is placed on the side of the other battery piece with the main grids, so that the solder strip is attached to the main grids and one end of the solder strip is overlapped on the busbar. A second adhesive film is attached to fix the solder strip on the side of the battery piece with the main grids. The above method improves the connection efficiency, is simple to operate, and reduces the cost.

Description

Technical Field

[0001] This invention relates to the field of photovoltaic module technology, and in particular to a method for stringing dense grid solar cells and a single cell. Background Technology

[0002] In photovoltaic modules, multiple solar cells are typically connected in series using interconnecting materials to form a cell string. For densely packed solar cells with even denser grid lines, the interconnection technology requirements are even higher. Currently, the mainstream connection method for densely packed solar cells in the industry is to use thin solder ribbons with small cross-sectional dimensions, simultaneously attaching them to the corresponding grid lines of two adjacent solar cells, and then fixing the solder ribbons to the grid lines on both sides of the solar cells and achieving electrical connection through welding (such as infrared welding or thermoforming welding).

[0003] However, this existing technology has significant drawbacks. Due to the large number and small spacing of the grid lines in dense-grid solar cells, extremely high precision alignment and bonding between the solder ribbon and the fine grid lines is required. This places extremely stringent demands on the alignment accuracy of the production equipment, the stability of the solder ribbon placement, and the control of welding process parameters, leading to complex operation and limited production cycle time. Simultaneously, the high-precision equipment and complex processes significantly increase production costs. Furthermore, the high temperatures during the welding process also pose a potential risk of thermal stress damage to the solar cells.

[0004] Therefore, it is urgent to study a method for stringing dense grid solar cells and a single cell to solve the above problems. Summary of the Invention

[0005] The purpose of this invention is to provide a method for stringing dense grid solar cells and a single cell, achieving greater precision tolerance, simpler operation, and lower cost.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: A method for stringing close-grid solar cells, comprising: S1. Connect all the protruding sections of the grid on a solar cell through a busbar and realize the electrical connection between the grid and the busbar, wherein the extension direction of the busbar is perpendicular to the extension direction of the grid. S2. The protruding section of the grid is fixed to the busbar using the first adhesive film; S3. Place the side of the busbar connected to the grid onto the side of another battery cell with the main grid. S4. Place a solder strip on the side of another cell with a main grid, so that the solder strip is attached to the main grid and one end of the solder strip overlaps the busbar. S5. Apply the second adhesive film to fix the welding ribbon to the side of the battery cell with the main grid. S6. Repeat S1-S5 to obtain the required number of battery cells in a battery string.

[0007] As an alternative technical solution for stringing dense grid solar cells, in S2, several dense grids are simultaneously bonded to a busbar by a first adhesive film. The extension direction of the first adhesive film is parallel to the extension direction of the busbar and perpendicular to the extension direction of the dense grids.

[0008] As an alternative technical solution for stringing close-grid solar cells, in S3, the first adhesive film becomes adhesive when heated, one side of the first adhesive film adheres the close grid to the busbar, and the other side of the first adhesive film adheres to the solar cell.

[0009] As an alternative technical solution for stringing dense grid solar cells, the dense grid is bonded to the busbar on one side of the first adhesive film, and in S4, the solder ribbon portion is placed on the first adhesive film.

[0010] As an optional technical solution for stringing close-grid solar cells, in S5, after applying the second adhesive film, a third adhesive film is applied. The third adhesive film is located on the side of the solder ribbon away from the busbar, and fixes the solder ribbon to the busbar. In S5, part of the second adhesive film covers and fixes the solder ribbon to the battery cell, and part of the second adhesive film fixes the solder ribbon to the busbar.

[0011] As an alternative technical solution for stringing dense grid solar cells, the extension direction of the third adhesive film is consistent with the extension direction of the busbar, and several solder strips are bonded to the busbar.

[0012] As an alternative technical solution for stringing dense grid solar cells, the width of the third adhesive film is greater than the width of the busbar, and the two sides of the third adhesive film are respectively bonded to the adjacent solar cells along the extension direction perpendicular to the busbar.

[0013] A method for stringing densely packed solar cells includes the following steps: S1. A fourth adhesive film perpendicular to the main grid is applied to the edge of the side of the solar cell with the main grid. S2. Place a solder ribbon on the side of the battery cell with the main grid, with one end of the solder ribbon overlapping the fourth adhesive film and the other end of the solder ribbon attached to the main grid. S3. Place a busbar on the side of the solar cell with the main grid, and overlap the busbar with the solder strip on the solar cell. S4. Overlap the protruding section of the grid on another cell onto the side of the busbar away from the solder strip to achieve electrical connection between the grid of the other cell and the busbar. S5. The protruding section of the grid is fixed to the busbar using the fifth adhesive film; S6. Repeat S1-S5 to obtain the required number of battery cells in a battery string.

[0014] A method for stringing densely packed solar cells includes the following steps: S1. A solder ribbon is placed on the side of a solar cell with a main grid, and the solder ribbon is fixed to the solar cell and attached to the main grid using a seventh adhesive film; the solder ribbon has an unfixed section extending out of the solar cell; S2. Place a busbar between two adjacent solar cells and electrically connect the busbar to the unfixed section of the solder strip on the solar cell. S3. Fix the unfixed section of the welding strip to the busbar using the eighth adhesive film; S4. Overlap the protruding section of the grid on another cell onto the side of the busbar away from the solder strip to achieve electrical connection between the grid of the other cell and the busbar. S5. The protruding section of the grid is fixed to the busbar using the ninth diaphragm; S6. Repeat S1-S5 to obtain the required number of battery cells in a battery string.

[0015] A battery cell includes a battery cell, a main grid disposed on one side of the battery cell, and a dense grid disposed on the other side of the battery cell, wherein the dense grid portion extends out of the battery cell to form an extended section.

[0016] The present invention has at least the following beneficial effects: This invention provides a method for stringing densely packed solar cells and a single solar cell. The method for stringing densely packed solar cells includes the following steps: S1. Connect all the protruding sections of the grid on a solar cell through a busbar, and realize the electrical connection between the grid and the busbar, wherein the extension direction of the busbar is perpendicular to the extension direction of the grid.

[0017] S2. The protruding section of the grid is fixed to the busbar through the first adhesive film.

[0018] S3. Place the side of the busbar connected to the grid onto the side of another cell with the main grid.

[0019] S4. Place a solder strip on the side of another cell with a main grid, so that the solder strip is attached to the main grid and one end of the solder strip overlaps the busbar.

[0020] S5. Apply the second adhesive film to fix the welding ribbon to the side of the battery cell with the main grid.

[0021] S6. Repeat S1-S5 to obtain the required number of battery cells in a battery string.

[0022] Using the above method, the connection of the grids on two solar cells is completed through a busbar, and the extension direction of the busbar is perpendicular to the extension direction of the grids. This allows one busbar to connect all the grids simultaneously, greatly reducing the number of times the two solar cells are connected together. It also enables the parallel connection of all the grids on the same solar cell and the series connection of adjacent solar cells, improving connection efficiency. At the same time, it greatly reduces the requirements for the alignment accuracy of the production equipment and the stability of the solder ribbon placement, thus simplifying operation and reducing costs. The bonding method using the first and second adhesive films does not generate high temperatures, avoiding the potential risk of thermal stress damage to the solar cells. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments of the present invention will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the content of the embodiments of the present invention and these drawings without creative effort.

[0024] Figure 1 This is a flowchart of the stringing method for dense grid solar cells in an embodiment of the present invention; Figure 2 This is a schematic diagram of the structure of two adjacent battery cells in a battery string in one embodiment of the present invention; Figure 3 for Figure 2 A magnified view of a section at point A in the middle; Figure 4 This is a schematic diagram of the structure combining the busbar and the extension section in one embodiment of the present invention; Figure 5 This is a schematic diagram of the structure in one embodiment of the present invention, showing the busbar and the protruding section fixed by a first adhesive film; Figure 6 This is a schematic diagram of a busbar connected to a dense grid placed on another battery cell in one embodiment of the present invention; Figure 7 This is a schematic diagram of a structure in one embodiment of the present invention, showing the placement of a solder strip on another battery cell; Figure 8 This is a schematic diagram of the structure of fixing the welding strip with a second adhesive film in one embodiment of the present invention; Figure 9 This is a schematic diagram of the structure in one embodiment of the present invention, which uses a third adhesive film to fix the busbar and the solder strip. Figure 10 This is a schematic diagram of the structure of fixing the busbar by a reinforcing membrane strip in one embodiment of the present invention; Figure 11This is a schematic diagram of the structure of the second membrane strip fixing welding strip and the busbar in one embodiment of the present invention; Figure 12 This is a schematic diagram of the battery string structure in another embodiment of the present invention; Figure 13 for Figure 12 A magnified view of a section at point B in the middle; Figure 14 This is a schematic diagram of the battery string structure in another embodiment of the present invention; Figure 15 for Figure 14 A magnified view of a section at point C.

[0025] In the picture: 100. Solar cell; 200. Closed grid; 210. Extended section; 300. Busbar; 400. Welding strip; 10. First adhesive film; 20. Second adhesive film; 30. Third adhesive film; 31. Reinforcing strip; 40. Fourth film; 50. Fifth film; 60. Sixth film; 70. Seventh film; 80. Eighth film; 90. Ninth film. Detailed Implementation

[0026] Before explaining any implementation of this application in detail, it should be understood that this application is not limited to its application to the structural details and component arrangements set forth in the following description or shown in the above drawings.

[0027] In this application, the terms "comprising," "including," "having," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0028] In this application, the term "and / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent three cases: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this application generally indicates that the preceding and following related objects have an "and / or" relationship.

[0029] In this application, the terms "connection," "combination," "coupling," and "installation" can refer to direct connection, combination, coupling, or installation, or indirect connection, combination, coupling, or installation. For example, a direct connection refers to two parts or components being connected together without the need for an intermediary, while an indirect connection refers to two parts or components each being connected to at least one intermediary, with the connection achieved through the intermediary. Furthermore, "connection" and "coupling" are not limited to physical or mechanical connections or couplings, but can also include electrical connections or couplings.

[0030] In this application, those skilled in the art will understand that relative terms (e.g., “about,” “approximately,” “basically,” etc.) used in conjunction with quantities or conditions are to include the values ​​and have the meaning indicated by the context. For example, such relative terms include at least the degree of error associated with the measurement of a particular value, tolerances associated with the particular value due to manufacturing, assembly, use, etc. Such terms should also be considered as disclosing a range defined by the absolute values ​​of the two endpoints. Relative terms may refer to a certain percentage (e.g., 1%, 5%, 10% or more) of the indicated value. Numerical values ​​that do not use relative terms should also be disclosed as specific values ​​with tolerances. Furthermore, “basically” when expressing relative angular relationships (e.g., substantially parallel, substantially perpendicular) may refer to a certain degree (e.g., 1 degree, 5 degrees, 10 degrees or more) added to or subtracted from the indicated angle.

[0031] In this application, those skilled in the art will understand that the function performed by a component can be performed by one component, multiple components, one part, or multiple parts. Similarly, the function performed by a part can also be performed by one part, one component, or a combination of multiple parts.

[0032] In this application, the directional terms "upper," "lower," "left," "right," "front," and "rear" are used to describe the orientation and positional relationships shown in the accompanying drawings and should not be construed as limiting the embodiments of this application. Furthermore, in the context, it should be understood that when an element is mentioned as being connected "upper" or "lower" to another element, it can be directly connected to the other element "upper" or "lower," or indirectly connected through an intermediate element. It should also be understood that directional terms such as upper side, lower side, left side, right side, front side, and rear side not only represent positive orientation but can also be understood as lateral orientation. For example, "below" can include directly below, lower left, lower right, lower front, and lower rear.

[0033] like Figures 1 to 10 As shown, this embodiment provides a method for stringing densely packed solar cells, the method comprising: S1. Connect the extended sections 210 of all the grids 200 on a solar cell 100 via a busbar 300, and achieve electrical connection between the grids 200 and the busbar 300, wherein the extending direction of the busbar 300 is perpendicular to the extending direction of the grids 200. The extended sections 210 of the grids 200 are located on the outer side of the solar cell 100. In other words, the portion of the grids 200 on the outer side of the solar cell 100 forms the extended section 210.

[0034] S2. The protruding section 210 of the grid 200 is fixed to the busbar 300 by the first adhesive film 10.

[0035] S3. Place the side of the busbar 300 connected to the grid 200 on the side of another cell 100 that has the main grid (not shown in the figure). That is, the grid 200 is sandwiched between the busbar 300 and the other cell 100.

[0036] S4. Place a solder ribbon 400 on the side of another cell 100 with a main grid, such that the solder ribbon 400 is attached to the main grid and one end of the solder ribbon 400 overlaps with the busbar 300.

[0037] S5. Apply the second adhesive film 20 to fix the welding ribbon 400 to the side of the battery cell 100 with the main grid.

[0038] S6. Repeat S1-S5 to obtain the required number of battery cells, 100, in a battery string.

[0039] Using the above method, the connection of the grids 200 on two solar cells 100 is completed by the busbar 300, and the extension direction of the busbar 300 is perpendicular to the extension direction of the grids 200. This allows one busbar 300 to connect all the grids 200 at the same time, greatly reducing the number of times the two solar cells 100 are docked. It also enables the parallel connection of all the grids 200 on the same solar cell 100 and the series connection of two adjacent solar cells 100, improving the connection efficiency. At the same time, it greatly reduces the requirements for the alignment accuracy of the production equipment and the stability of the welding ribbon 400, thus simplifying the operation and reducing the cost. The bonding method using the first adhesive film 10 and the second adhesive film 20 does not generate high temperature, avoiding the potential risk of thermal stress damage to the solar cells 100.

[0040] In some embodiments, S2, the protruding section 210 of the grid 200 is fixed to the busbar 300 by welding or adhesive application. S5, the welding strip 400 is fixed to the side of the cell 100 having the main grid by welding or adhesive application.

[0041] In step S2, several grids 200 are simultaneously bonded to a busbar 300 using a first adhesive film 10. The extension direction of the first adhesive film 10 is parallel to the extension direction of the busbar 300 and perpendicular to the extension direction of the grids 200. This one-time batch operation reduces production steps and time. Furthermore, this one-time bonding process helps ensure continuous and uniform adhesion between the busbar 300 and all grids 200, ensuring consistent adhesion strength at each connection point, thereby improving overall reliability.

[0042] In step S3, the first adhesive film 10 becomes adhesive when heated. After heating, one side of the first adhesive film 10 adheres to the grid 200 to the busbar 300, and the other side adheres to the solar cell 100. The first adhesive film 10 can be an ethylene-vinyl acetate copolymer film or a polyolefin elastomer film. This method helps to connect the busbar 300, the grid 200, and the solar cell 100 into a whole; at the same time, the first adhesive film 10 can absorb or buffer the micro-stress generated between the solar cell 100 and the busbar 300 due to the coefficient of thermal expansion. In addition, this method integrates the two steps of bonding the grid 200 to the busbar 300 and fixing the busbar 300 to the solar cell 100 into one step, improving the connection efficiency. At the same time, during the melting process of the first adhesive film 10, it can fill the gaps between the grid 200, the busbar 300, and the solar cell 100, reducing voids and thus improving the bonding quality. In other embodiments, the first adhesive film 10 is a single-sided adhesive, used only for bonding the grid 200 and the busbar 300. In other embodiments, the first adhesive film 10 is a double-sided adhesive. First, a release film is peeled off, and the first adhesive film 10 is bonded to the grid 200 and the busbar 300. Then, a second release film is peeled off, and the first adhesive film 10 is bonded to the battery cell 100. Furthermore, the double-sided adhesive eliminates the need for heating or waiting processes such as melting and curing of the first adhesive film 10, improving production efficiency and avoiding damage to the battery cell 100 or other components caused by heat. The side of the first adhesive film 10 facing the grid 200 has several grooves, and the grid 200 is placed in the grooves one-to-one, improving the connection between the first adhesive film 10 and the grid 200, reducing porosity, and providing automatic alignment. In this embodiment, the first adhesive film 10 can be placed on the workbench first, and then all the grids 200 can be placed on the first adhesive film 10 at once. Then, the busbar 300 can be placed on all the grids 200 to complete the bonding of the busbar 300 and the grids 200.

[0043] In some embodiments, the width of the first adhesive film 10 is greater than the width of the busbar 300. One side of the first adhesive film 10 adheres the grid 200 to the busbar 300, and in S4, a portion of the solder ribbon 400 is placed on the first adhesive film 10. This arrangement ensures the stability of the bond between the solder ribbon 400 and the battery cell 100 by bonding the first adhesive film 100 to the solder ribbon 400. In S5, the second adhesive film 20 is used to bond and fix the solder ribbon 400, ensuring its stability after placement and before S5.

[0044] In S5, the second adhesive film 20 and the solder ribbon 400 correspond one-to-one. The second adhesive film 20 and the solder ribbon 400 extend in the same direction, and the length of the second adhesive film 20 is greater than half the length of the solder ribbon 400. The second adhesive film 20 bonds each solder ribbon 400 individually, covering more than half of the ribbon, providing continuous and uniform pressure and ensuring connection stability. The second adhesive film 20 is a low-temperature curing film, and a staged curing method is used during fixation. First, the second adhesive film 20 is initially cured at a lower temperature to fix the solder ribbon 400. Then, the temperature is increased to further enhance the fixing effect. Since the solder ribbon 400 is already stable before high-temperature impact, displacement is avoided.

[0045] In some embodiments, in S5, after applying the second adhesive film 20, a third adhesive film 30 is applied. The third adhesive film 30 is located on the side of the solder ribbon 400 away from the busbar 300, and fixes the solder ribbon 400 to the busbar 300. This method fixes the end of the solder ribbon 400 to the busbar 300, preventing warping.

[0046] Combination Figure 11 As shown, in some embodiments, in S5, a portion of the second adhesive film 20 covers the solder ribbon 400 to secure it to the battery cell 100, and a portion of the second adhesive film 20 secures the solder ribbon 400 to the busbar 300. This simplifies the connection steps between the solder ribbon 400 and the busbar 300 and improves connection efficiency.

[0047] In some embodiments, the second adhesive film 20 partially bonds the solder ribbon 400 and the battery cell 100, and partially bonds the solder ribbon 400 and the busbar 300. A third adhesive film 30 is bonded to the upper side of the second adhesive film 20, fixing the solder ribbon 400 and the busbar 300. This method provides double fixation, ensuring the connection stability of the busbar 300 and the solder ribbon 400 and preventing the solder ribbon 400 from shifting. Furthermore, the extension direction of the third adhesive film 30 is consistent with the extension direction of the busbar 300, simultaneously bonding several solder ribbons 400 to the busbar 300. This method improves the connection efficiency between the busbar 300 and the solder ribbons 400.

[0048] The width of the third adhesive film 30 is greater than the width of the busbar 300. Along a direction perpendicular to the extension of the busbar 300, both sides of the third adhesive film 30 are respectively bonded to adjacent battery cells 100. First, the third adhesive film 30 is used to connect the solder ribbon 400 and the busbar 300; second, the third adhesive film 30 is used to connect the busbar 300 and the battery cells 100; third, the third adhesive film 30 also has the function of connecting adjacent battery cells 100.

[0049] In other embodiments, the reinforcing membrane strip 31 extends along the length of the busbar 300, with one end bonded to the battery cell 100 on the left and the other end bonded to the battery cell 100 on the right. At least two reinforcing membrane strips 31 are provided, and the two reinforcing membrane strips 31 are arranged at intervals along the extension direction (front-back direction) of the busbar 300.

[0050] It should be noted that the busbar 300 is placed above the grid 200, and the first adhesive film 10 is located below the grid 200. During bonding, the grid 200 and the busbar 300 can be transferred onto the first adhesive film 10 simultaneously. In some embodiments, the grid 200 is first placed on the busbar 300, then the first adhesive film 10 is attached, then the battery cell 100 with the grid 200 and the busbar 300 is flipped so that the busbar 300 is above the grid 200, and finally the busbar 300 is placed on another battery cell 100.

[0051] Combination Figure 12 and Figure 13 As shown, in some embodiments, a method for stringing densely packed solar cells includes the following steps: S1. A fourth adhesive film 40 perpendicular to the main grid is attached to the edge of the side of the battery cell 100 where the main grid is located.

[0052] S2. A solder ribbon 400 is placed on the side of the battery cell 100 with the main grid. One end of the solder ribbon 400 overlaps the fourth adhesive film 40, and the other end of the solder ribbon 400 is attached to the main grid.

[0053] S3. A busbar 300 is placed on the side of the cell 100 with the main grid, and the busbar 300 overlaps with the solder strip 400 on the cell 100.

[0054] The fourth adhesive film 40 is heated and melted, thereby fixing the solder ribbon 400, busbar 300, and battery cell 100 together. In other embodiments, the fourth adhesive film 40 is a double-sided adhesive, with its lower side bonded to the battery cell 100 and its upper side bonding the solder ribbon 400 and busbar 300 together.

[0055] S4. The protruding section 210 of the grid 200 on another cell 100 is overlapped with the side of the busbar 300 away from the solder strip 400, so as to realize the electrical connection between the grid 200 of the other cell 100 and the busbar 300.

[0056] S5. The protruding section 210 of the grid 200 is fixed to the busbar 300 by the fifth adhesive film 50.

[0057] S6. Repeat S1-S5 to obtain the required number of battery cells, 100, in a battery string.

[0058] In S2, another section of the solder ribbon 400 is fixed to the main grid surface of the cell 100 by the sixth adhesive film 60.

[0059] Combination Figure 14 and Figure 15 As shown, in some embodiments, a method for stringing densely packed solar cells includes the following steps: S1. A solder ribbon 400 is placed on the side of a solar cell 100 with a main grid, and the solder ribbon 400 is fixed to the solar cell 100 by a seventh adhesive film 70 (or by welding, dispensing, etc.) and is attached to the main grid; the solder ribbon 400 has an unfixed section extending out of the solar cell 100.

[0060] S2. Place a busbar 300 between two adjacent solar cells 100 and electrically connect the busbar 300 to the unfixed section of the solder strip 400 on the solar cell 100.

[0061] S3. Fix the unfixed section of the welding strip 400 to the busbar 300 using the eighth adhesive film 80 (or by welding or dispensing).

[0062] S4. The protruding section 210 of the grid 200 on another cell 100 is overlapped with the side of the busbar 300 away from the welding strip 400, so as to realize the electrical connection between the grid 200 of the other cell 100 and the busbar 300.

[0063] S5. Fix the protruding section 210 of the grid 200 to the busbar 300 by means of the ninth adhesive film 90 (or by welding or dispensing). S6. Repeat S1-S5 to obtain the required number of battery cells, 100, in a battery string.

[0064] In other embodiments, the execution sequence is as follows: first, the busbar 300 is placed on the protruding section 210 of the grid 200 of a battery cell 100 and fixed; then, a solder ribbon 400 is placed on another battery cell 100 and fixed, the solder ribbon 400 having an unfixed section that partially extends outward from the battery cell 100; the unfixed section is placed on the side of the busbar 300 away from the grid 200; finally, the unfixed section of the solder ribbon 400 is fixed to the busbar 300.

[0065] This embodiment also provides a battery cell, including a battery cell (100), a main grid disposed on one side of the battery cell (100), and a dense grid (200) disposed on the other side of the battery cell (100), wherein a portion of the dense grid (200) extends out of the battery cell (100) to form an extension section (210).

[0066] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art will be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A method for stringing densely packed solar cells, characterized in that, include: S1. Connect the extended sections (210) of all the grids (200) on a battery cell (100) through a busbar (300) and realize the electrical connection between the grids (200) and the busbar (300), wherein the extension direction of the busbar (300) is perpendicular to the extension direction of the grids (200). S2. The protruding section (210) of the grid (200) is fixed to the busbar (300) by the first adhesive film (10); S3. Place the side of the busbar (300) connected to the grid (200) on the side of another cell (100) with the main grid; S4. Place a solder strip (400) on the side of another cell (100) with a main grid, such that the solder strip (400) is attached to the main grid and one end of the solder strip (400) overlaps with the busbar (300); S5. Apply the second adhesive film (20) to fix the welding ribbon (400) to the side of the battery cell (100) with the main grid. S6. Repeat S1-S5 to obtain the required number of battery cells (100) in a battery string.

2. The method for stringing dense-grid solar cells according to claim 1, characterized in that, In S2, several grids (200) are simultaneously bonded to a busbar (300) by a first adhesive film (10). The extension direction of the first adhesive film (10) is parallel to the extension direction of the busbar (300) and perpendicular to the extension direction of the grids (200).

3. The method for stringing dense-grid solar cells according to claim 2, characterized in that, In S3, the first adhesive film (10) becomes sticky when heated. One side of the first adhesive film (10) bonds the grid (200) to the busbar (300), and the other side of the first adhesive film (10) bonds to the battery cell (100).

4. The method for stringing dense-grid solar cells according to claim 3, characterized in that, One side of the first adhesive film (10) is bonded to the busbar (300), and in S4, a portion of the solder strip (400) is placed on the first adhesive film (10).

5. The method for stringing dense-grid solar cells according to claim 1, characterized in that, In S5, after applying the second adhesive film (20), a third adhesive film (30) is applied. The third adhesive film (30) is located on the side of the solder ribbon (400) away from the busbar (300), and fixes the solder ribbon (400) to the busbar (300), or... In S5, a portion of the second adhesive film (20) covers and fixes the solder ribbon (400) to the battery cell (100), and a portion of the second adhesive film (20) fixes the solder ribbon (400) to the busbar (300).

6. The method for stringing dense-grid solar cells according to claim 5, characterized in that, The third adhesive film (30) extends in the same direction as the busbar (300), and several solder strips (400) are bonded to the busbar (300).

7. The method for stringing dense-grid solar cells according to claim 6, characterized in that, The width of the third adhesive film (30) is greater than the width of the busbar (300). Along the extension direction perpendicular to the busbar (300), the two sides of the third adhesive film (30) are respectively bonded to the adjacent battery cells (100).

8. A method for stringing densely packed solar cells, characterized in that, Includes the following steps: S1. A fourth adhesive film (40) perpendicular to the main grid is attached to the edge of the side of the battery cell (100) with the main grid. S2. A solder ribbon (400) is placed on the side of the battery cell (100) with the main grid. One end of the solder ribbon (400) overlaps on the fourth adhesive film (40), and the other end of the solder ribbon (400) is attached to the main grid. S3. A busbar (300) is placed on the side of the battery cell (100) with the main grid, and the busbar (300) overlaps with the solder strip (400) on the battery cell (100); S4. The protruding section (210) of the grid (200) on another cell (100) is overlapped with the side of the busbar (300) away from the solder strip (400) to achieve electrical connection between the grid (200) of the other cell (100) and the busbar (300). S5. The protruding section (210) of the grid (200) is fixed to the busbar (300) by the fifth adhesive film (50); S6. Repeat S1-S5 to obtain the required number of battery cells (100) in a battery string.

9. A method for stringing densely packed solar cells, characterized in that, Includes the following steps: S1. A solder ribbon (400) is placed on the side of a solar cell (100) with a main grid. The solder ribbon (400) is fixed to the solar cell (100) by a seventh adhesive film (70) and is attached to the main grid. The solder ribbon (400) has an unfixed section extending out of the solar cell (100). S2. Place a busbar (300) between two adjacent solar cells (100) and electrically connect the busbar (300) to the unfixed section of the solder strip (400) on the solar cell (100); S3. Fix the unfixed section of the solder strip (400) to the busbar (300) through the eighth adhesive film (80); S4. The protruding section (210) of the grid (200) on another cell (100) is overlapped on the side of the busbar (300) away from the solder strip (400) to achieve electrical connection between the grid (200) of the other cell (100) and the busbar (300). S5. The protruding section (210) of the grid (200) is fixed to the busbar (300) by the ninth adhesive film (90); S6. Repeat S1-S5 to obtain the required number of battery cells (100) in a battery string.

10. A single battery cell, characterized in that, It includes a battery cell (100), a main grid on one side of the battery cell (100), and a dense grid (200) on the other side of the battery cell (100), wherein a portion of the dense grid (200) extends out of the battery cell (100) to form an extension section (210).

Images