Photovoltaic module and manufacturing method therefor

Abstract

The present application belongs to the technical field of photovoltaic modules, and particularly comprises a photovoltaic module and a manufacturing method therefor. The photovoltaic module comprises: a cell, the surface of the cell being provided with a plurality of thin gate lines spaced apart in a first direction; connection wires, the connection wires being arranged on the surface of the cell and intersecting with the thin gate lines, each connection wire comprising a connection wire substrate and a bonding layer attached to the surface of the connection wire substrate. The photovoltaic module has first areas and second areas, the first areas and the second areas being all located between the connection wire substrates and the surface of the cell, the projections of the first areas on the cell being located on the thin gate lines, and the projections of the second areas on the cell being located between the thin gate lines; the filling ratio of the bonding layer in the first areas is greater than the filling ratio of the bonding layer in the second areas.

Description

Photovoltaic module and preparation method thereof

[0001] This application claims priority to the Chinese patent application filed with the Patent Office of China on September 27, 2023, with application number 202311269501.5, and invention name “A photovoltaic module and its preparation method”, and the Chinese patent application filed with the Patent Office of China on November 8, 2023, with application number 202311482579.5, and invention name “A photovoltaic module and its preparation method”, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present application relates to the technical field of photovoltaic modules, and in particular to a photovoltaic module and a method for preparing the same. Background Art

[0003] Photovoltaic modules convert solar energy into electricity. The core component of a photovoltaic module is the cell. Typically, multiple cells are arranged in intervals, with adjacent cells electrically connected by welding ribbons to collect the current generated by the cells.

[0004] In the related art, welding is usually used to weld the welding ribbon to the surface of the battery cell to achieve electrical connection between the welding ribbon and the battery cell.

[0005] However, the method of electrically connecting the soldering ribbon to the cell by welding can affect the photovoltaic conversion efficiency of some cells. For example, welding the soldering ribbon to the surface of a heterojunction cell by welding can reduce the photovoltaic conversion efficiency of the heterojunction cell.

[0006] Summary of the Invention

[0007] The purpose of this application is to provide a photovoltaic module and a method for preparing the same.

[0008] Specifically, this application involves the following aspects:

[0009] In a first aspect, the present application discloses a photovoltaic module, which includes: a cell, the surface of which is provided with a plurality of fine grid lines arranged at intervals along a first direction; a connecting line, which is provided on the surface of the cell and intersects with the fine grid lines, and the connecting line includes a connecting line base and a bonding layer attached to the surface of the connecting line base; wherein the photovoltaic module has a first area and a second area, the first area and the second area are both located between the connecting line base and the surface of the cell, the projection of the first area on the cell is on the fine grid lines, and the projection of the second area on the cell is between the fine grid lines; the filling ratio of the bonding layer at the first area is greater than the filling ratio of the bonding layer at the second area.

[0010] Optionally, the photovoltaic module also has a first cross-section, which is perpendicular to the surface of the cell and passes through the first area; at the first cross-section, the bonding layer includes an arc-shaped structure arranged on the side of the connecting wire base away from the cell and a rectangular structure arranged on the side of the connecting wire base close to the cell.

[0011] Optionally, a connection between the rectangular structure and the battery cell has a chamfered structure.

[0012] Optionally, at the first region, the bonding layer completely fills the first region.

[0013] Optionally, at the second region, a first gap exists between at least a portion of the bonding layer and the surface of the battery cell, and the first gap is not filled by the bonding layer.

[0014] Optionally, the photovoltaic module further comprises: a fixing layer, the fixing layer being arranged on a side of the connecting wire away from the solar cell, the fixing layer being used to fix the connecting wire to the surface of the solar cell.

[0015] Optionally, along a direction perpendicular to the plane where the battery cell is located, the fixed layer has a first projection, and the first projection falls into the battery cell.

[0016] Optionally, the photovoltaic assembly further includes: a plurality of glue points spaced apart along the extension direction of the connecting wire, the glue points being disposed between the connecting wire and the surface of the battery cell, and the glue points being used to fix the connecting wire to the surface of the battery cell.

[0017] Optionally, the melting point of the bonding layer is less than 165 degrees, and the bonding layer includes at least one of a tin-lead-bismuth layer, a tin-bismuth-silver layer, or a tin-indium layer.

[0018] Optionally, the photovoltaic module further includes: an adhesive layer and a cover plate or a back plate, wherein the adhesive layer and the cover plate or the back plate are sequentially arranged on the side of the connecting line away from the battery cell, so as to connect the cover plate or the back plate to the battery cell through the adhesive layer.

[0019] Optionally, the battery cells include a plurality of battery cells, the plurality of battery cells are arranged at intervals, and a second gap exists between two adjacent battery cells; the adhesive layer is provided in the second gap along a direction perpendicular to the plane where the battery cells are located.

[0020] Optionally, the battery cell includes a battery cell without a main grid line.

[0021] Optionally, the fixing layer is a single-layer structure, and the single-layer structure is an EVA layer.

[0022] Optionally, the fixing layer is a double-layer structure, which includes an EVA layer and a POE layer, wherein the EVA layer is arranged on a side of the fixing layer close to the battery cell, and the EVA layer is partially connected to the battery cell.

[0023] Optionally, at least one main grid line is further provided on the battery cell, and at least one main grid line extends along the first direction; along the direction perpendicular to the plane where the battery cell is located, the projection of at least one main grid line on the battery cell is staggered with the projection of the connecting line on the battery cell.

[0024] Optionally, along a second direction perpendicular to the first direction, the battery cell has a first side surface and a second side surface arranged opposite to each other; the main bus lines include two, one main bus line is arranged in an area of ​​the surface of the battery cell close to the first side surface, and the other main bus line is arranged in an area of ​​the surface of the battery cell close to the second side surface.

[0025] In a second aspect, the present application discloses a method for preparing a photovoltaic module, the method comprising the following steps: (1) arranging a connecting wire on at least one surface of a cell; wherein the surface of the cell is provided with a plurality of fine grid lines arranged at intervals along a first direction, the connecting wires intersect with the fine grid lines, and the connecting wires comprise a connecting wire substrate and a bonding layer attached to the surface of the connecting wire substrate; (2) heating the cell and the connecting wires so that the connecting wires are fixed to the surface of the cell; (3) providing a sealing layer to seal the heated cell through the sealing layer; wherein the photovoltaic module has a first region and a second region, the first region and the second region are both located between the connecting wire substrate and the surface of the cell, the projection of the first region on the cell is on the fine grid lines, and the projection of the second region on the cell is between the fine grid lines; the filling ratio of the bonding layer at the first region is greater than the filling ratio of the bonding layer at the second region.

[0026] Optionally, after setting the connecting wire on at least one surface of the battery cell, the method further includes: setting a fixing layer on the side of the connecting wire away from the battery cell to form a stacking structure; the method of heating the battery cell and the connecting wire to fix the connecting wire to the surface of the battery cell further includes: heating the stacking structure to fix the connecting wire to the surface of the battery cell through the fixing layer.

[0027] Optionally, the method of setting a connecting line on at least one surface of a battery cell includes: setting a plurality of glue points at intervals on the surface of the battery cell along the extension direction of the connecting line, and laying the connecting line on the side of the plurality of glue points away from the battery cell.

[0028] Optionally, the sealing layer includes a glue layer and a cover plate or a back plate, the glue layer is at least partially adhered to the battery cell, and the cover plate or the back plate is arranged on a side of the glue layer away from the battery cell.

[0029] Optionally, the stacked structure sequentially arranges the connecting wire and the fixing layer on one surface of the battery cell, and sequentially arranges another connecting wire and another fixing layer on the other surface of the battery cell, and two adjacent battery cells are connected by the same connecting wire.

[0030] Optionally, the method of arranging a connecting wire on at least one surface of a battery cell and arranging a fixing layer on a side of the connecting wire away from the battery cell to form a stacked structure further includes: providing a first fixing layer; providing a first connecting wire, and laying the first connecting wire on a surface of the first fixing layer; providing a battery cell, and laying the battery cell on a side of the first connecting wire away from the first fixing layer; providing a second connecting wire, and laying the second connecting wire on a surface of the battery cell away from the first connecting wire; providing a third fixing layer, and laying the third fixing layer on a surface of the second connecting wire away from the battery cell; wherein a portion of the first connecting wire is laid on a surface of an adjacent battery cell close to the third fixing layer, and another portion of the first connecting wire extends to the first fixing layer and is laid on the surface of the first fixing layer.

[0031] Optionally, the stacked structure is provided with the connecting wires and the fixing layer only on one surface of the battery cell, and the connecting wires and the fixing layer are not provided on the other surface of the battery cell.

[0032] Optionally, the method of arranging a connecting line on at least one surface of a battery cell and arranging a fixing layer on a side of the connecting line away from the battery cell to form a stacked structure also includes: providing at least two fixing layers and arranging the at least two fixing layers at intervals; providing a connecting line, laying a portion of the connecting line on one of the fixing layers, extending another portion of the connecting line to an adjacent fixing layer and laying it on the adjacent fixing layer; providing at least two battery cells, stacking the battery cells on a side of the connecting line away from the fixing layer, so that each of the battery cells is arranged corresponding to one of the fixing layers.

[0033] Optionally, after providing a sealing layer and sealing the heated solar cell with the sealing layer, the method further comprises: laminating the photovoltaic module, wherein the lamination temperature is greater than or equal to 100 degrees and less than or equal to 165 degrees.

[0034] In a third aspect, the present application provides a photovoltaic module, which includes: a cell, wherein a plurality of first fine grid lines arranged at intervals along a first direction are arranged on the first surface of the cell, and a plurality of second fine grid lines arranged at intervals along the first direction are arranged on the second surface of the cell; a third connecting line and a fourth connecting line, wherein the third connecting line is arranged on the first surface of the cell and intersects with the first fine grid lines, and the fourth connecting line is arranged on the second surface of the cell and intersects with the second fine grid lines, and the third connecting line and the fourth connecting line both include a connecting line base and a bonding layer attached to the surface of the connecting line base; wherein the filling ratio of the bonding layer between the connecting line base and the first surface of the third connecting line is greater than the filling ratio of the bonding layer between the connecting line base and the second surface of the fourth connecting line.

[0035] Optionally, the first surface is the light-receiving surface of the cell.

[0036] Optionally, the number of the first thin gate lines on the first surface is less than the number of the second thin gate lines on the second surface.

[0037] Optionally, the photovoltaic component has a first area and a second area, both of which are located between the connecting wire base of the fourth connecting wire and the second surface, the projection of the first area on the battery cell is on the second fine grid lines, and the projection of the second area on the battery cell is between the second fine grid lines; the filling ratio of the bonding layer at the first area is greater than the filling ratio of the bonding layer at the second area.

[0038] Optionally, the cross-section of the connecting wire base of the third connecting wire and the cross-section of the connecting wire base of the fourth connecting wire are both circular, and the diameters of the circles are the same.

[0039] Optionally, a filling amount of the bonding layer between the third connection line and the first surface is greater than a filling amount of the bonding layer between the fourth connection line and the second surface.

[0040] Optionally, the cell comprises a heterojunction cell.

[0041] Optionally, the cell further has a transparent conductive layer, which is disposed on the first surface and the second surface; wherein the third connecting line and / or the fourth connecting line is electrically connected to the transparent conductive layer through the bonding layer.

[0042] Optionally, the battery cell includes a battery cell without a busbar.

[0043] The present application discloses a photovoltaic module and a preparation method thereof, wherein the photovoltaic module comprises: a cell, wherein the surface of the cell is provided with a plurality of fine grid lines arranged at intervals along a first direction; a connecting line, wherein the connecting line is provided on the surface of the cell and intersects with the fine grid lines, and the connecting line comprises a connecting line substrate and a bonding layer attached to the surface of the connecting line substrate; wherein the photovoltaic module has a first area and a second area, wherein the first area and the second area are both located between the connecting line substrate and the surface of the cell, the projection of the first area on the cell is on the fine grid lines, and the projection of the second area on the cell is between the fine grid lines; the filling ratio of the bonding layer in the first area is greater than the filling ratio of the bonding layer in the second area.

[0044] The photovoltaic module in the present application has a first area and a second area, both of which are located between the connecting wire substrate and the surface of the cell, and the projection of the first area on the cell is on the fine grid lines, and the projection of the second area on the cell is between the fine grid lines. In the present application, by setting the filling ratio of the bonding layer at the first area to be greater than the filling ratio of the bonding layer at the second area, the connecting wire can be better electrically connected to the fine grid lines, and the current at the fine grid lines is collected by the connecting wire to improve the photoelectric conversion efficiency of the cell.

[0045] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] In order to more clearly illustrate the technical solutions in the embodiments of the present application or related technologies, the following is a brief introduction to the drawings required for use in the embodiments or related technical descriptions. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0047] FIG1 shows a schematic structural diagram of a photovoltaic module according to an embodiment of the present application;

[0048] FIG2 shows a second structural diagram of the photovoltaic assembly described in an embodiment of the present application;

[0049] FIG3 shows a third structural diagram of the photovoltaic assembly according to an embodiment of the present application;

[0050] FIG4 is a schematic side view of the photovoltaic module according to an embodiment of the present application;

[0051] FIG5 shows a cross-sectional view AA of the photovoltaic module according to an embodiment of the present application;

[0052] FIG6 shows a cross-sectional view BB of the photovoltaic module according to an embodiment of the present application;

[0053] FIG7 shows a cross-sectional view BB of the photovoltaic module according to another embodiment of the present application;

[0054] FIG8 shows a cross-sectional view CC of the photovoltaic module at a first cross section;

[0055] FIG9 shows a partial enlarged view DD of the photovoltaic module at a first cross section;

[0056] FIG10 shows a cross-sectional view EE of the photovoltaic module at a second cross section;

[0057] FIG11 shows a partial enlarged view FF of the photovoltaic module at the second cross section;

[0058] FIG12 is a schematic diagram showing the first region and the second region of the photovoltaic module according to an embodiment of the present application;

[0059] FIG13 is a schematic diagram showing a top view of the photovoltaic assembly according to another embodiment of the present application;

[0060] FIG14 is a schematic side view of the photovoltaic module according to another embodiment of the present application;

[0061] FIG15 shows a first flow chart of the preparation of the photovoltaic module described in the embodiment of the present application;

[0062] FIG16 shows a second flow chart of the preparation of the photovoltaic module described in the embodiment of the present application;

[0063] FIG17 shows a third flow chart of the preparation process of the photovoltaic module described in the embodiment of the present application;

[0064] FIG18 shows a fourth flow chart of the preparation process of the photovoltaic module described in the embodiment of the present application;

[0065] FIG19 shows a fifth flow chart of the preparation process of the photovoltaic module described in the embodiment of the present application.

[0066] Reference numerals:

[0067] 10: Cell; 11: Fine grid line; 111: First fine grid line; 112: Second fine grid line; 12: Busbar; 13: First cell; 14: Second cell; 15: Third cell; 16: First surface; 17: Second surface;

[0068] 20: connecting line; 21: connecting line base; 22: bonding layer; 221: arc-shaped structure; 222: rectangular structure; 223: chamfered structure; 23: first gap; 24: first connecting line; 25: second connecting line; 26: third connecting line; 27: fourth connecting line;

[0069] 30: fixed layer; 31: first fixed layer; 32: second fixed layer; 33: third fixed layer; 34: fourth fixed layer;

[0070] 40: adhesive layer;

[0071] 50: cover plate;

[0072] 60: back panel;

[0073] 70: glue point;

[0074] 80: first area; 81: second area;

[0075] H: first direction; K: second direction. Specific embodiments

[0076] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0077] Referring to Figure 1, there is shown a structural schematic diagram 1 of the photovoltaic assembly described in an embodiment of the present application; referring to Figure 2, there is shown a structural schematic diagram 2 of the photovoltaic assembly described in an embodiment of the present application; referring to Figure 3, there is shown a structural schematic diagram 3 of the photovoltaic assembly described in an embodiment of the present application; referring to Figure 4, there is shown a side structural schematic diagram of the photovoltaic assembly described in an embodiment of the present application; referring to Figure 5, there is shown a cross-sectional view AA of the photovoltaic assembly described in an embodiment of the present application; referring to Figure 6, there is shown a cross-sectional view BB of the photovoltaic assembly described in an embodiment of the present application; referring to Figure 7, there is shown a cross-sectional view BB of the photovoltaic assembly described in another embodiment of the present application; referring to Figure 8, there is shown a cross-sectional view CC of the photovoltaic assembly at the first cross-section; referring to Figure 9, there is shown a partially enlarged view DD of the photovoltaic assembly at the first cross-section; referring to Figure 10, there is shown a cross-sectional view EE of the photovoltaic assembly at the second cross-section; referring to Figure 11, there is shown a partially enlarged view FF of the photovoltaic assembly at the second cross-section; referring to Figure 12, there are shown schematic diagrams of the first region and the second region of the photovoltaic assembly described in an embodiment of the present application.

[0078] As shown in Figures 1 to 12, an embodiment of the present application discloses a photovoltaic module, which includes: a battery cell 10, the surface of the battery cell 10 is provided with a plurality of fine grid lines 11 arranged at intervals along a first direction H; a connecting line 20, the connecting line 20 is provided on the surface of the battery cell 10 and intersects with the fine grid lines 11, the connecting line 20 includes a connecting line base 21 and a bonding layer 22 attached to the surface of the connecting line base 21; wherein, the photovoltaic module has a first area 80 and a second area 81, the first area 80 and the second area 81 are both located between the connecting line base 21 and the surface of the battery cell 10, the projection of the first area 80 on the battery cell 10 is on the fine grid lines 11, and the projection of the second area 81 on the battery cell 10 is between the fine grid lines 11; the filling ratio of the bonding layer 22 at the first area 80 is greater than the filling ratio of the bonding layer 22 at the second area 81.

[0079] The embodiment of the present application discloses a photovoltaic module, which includes a cell 10, and the cell 10 generally includes a plurality of cells 10, and the plurality of cells 10 are arranged at intervals. The cell 10 can absorb solar energy and convert the solar energy into electrical energy. The surface of the cell 10 is provided with a plurality of fine grid lines 11 arranged at intervals along a first direction H, and the plurality of fine grid lines 11 all extend along a second direction K. The fine grid lines 11 are conductive, and a metal paste can be printed on the surface of the cell 10 by screen printing to form the fine grid lines 11, and the current generated by the cell 10 is collected by the fine grid lines 11.

[0080] It should be noted that the cell 10 in the embodiment of the present application may be a cell without busbars 12 or a cell with busbars 12. In the embodiment of the present application, there is no specific restriction on whether busbars 12 are provided on the surface of the cell 10. In actual use, technicians can provide them as needed.

[0081] As shown in Figures 1 to 12 , the photovoltaic module disclosed in the embodiments of the present application is further provided with connecting wires 20 . The connecting wires 20 also include a plurality of connecting wires 20 , which are arranged on the surface of the solar cell 10 at intervals along the second direction K, and all of the connecting wires 20 extend along the first direction H. When the first direction H is perpendicular to the second direction K, the connecting wires 20 are perpendicularly connected to the fine grid lines 11 .

[0082] The connecting wire 20 in the embodiment of the present application includes a connecting wire base 21 and a bonding layer 22 attached to the surface of the connecting wire base 21. Both the connecting wire base 21 and the bonding layer 22 are conductive. Among them, the connecting wire base 21 is usually a copper wire. For example, the connecting wire base 21 can be an oxygen-free copper wire. Of course, the connecting wire base 21 can also be other metal wires, such as aluminum wire, etc. In the embodiment of the present application, there are no excessive restrictions on the specific material of the connecting wire base 21. In actual use, technicians can choose a suitable material as needed.

[0083] The bonding layer 22 may be a tin-lead-bismuth layer, a tin-bismuth-silver layer, or a tin-indium layer. Of course, the bonding layer 22 may also be any other conductive metal layer having a melting point less than 165 degrees Celsius. In the embodiments of the present application, there are no additional restrictions on the specific material of the bonding layer 22. In actual use, technicians can select an appropriate material as needed.

[0084] As shown in Figures 6 to 12, the photovoltaic module disclosed in the embodiments of the present application further has a first region 80 and a second region 81. The first region 80 is located between the connecting wire substrate 21 and the surface of the cell 10, and the projection of the first region 80 on the cell 10 is on the fine grid lines 11. The second region 81 is also located between the connecting wire substrate 21 and the surface of the cell 10, and the projection of the second region 81 on the cell 10 is between two adjacent fine grid lines 11.

[0085] As shown in Figures 6, 7 and 12, in the embodiment of the present application, the bonding layer 22 at the first region 80 is set to a continuous structure, and the bonding layer 22 at the second region 81 is set to a mottled structure, so that the filling ratio of the bonding layer 22 at the first region 80 is greater than the filling ratio of the bonding layer 22 at the second region 81. In the embodiment of the present application, by setting the filling ratio of the bonding layer 22 at the first region 80 to be greater than the filling ratio of the bonding layer 22 at the second region 81, the connecting wire 20 can be better electrically connected to the fine grid line 11, and the current at the fine grid line 11 is collected by the connecting wire 20 to improve the photoelectric conversion efficiency of the battery cell 10.

[0086] It should be noted that the filling ratio in the embodiments of the present application refers to the ratio of the volume of the bonding layer 22 material to the volume of the corresponding region. For example, in the embodiments of the present application, the filling ratio of the bonding layer 22 in the first region 80 can be set to be greater than 50%, that is, the volume of the bonding layer 22 in the first region 80 accounts for more than 50% of the volume of the first region 80. The filling ratio of the bonding layer 22 in the second region 81 is less than 50%, that is, the volume of the bonding layer 22 in the second region 81 accounts for less than 50% of the volume of the second region 81.

[0087] Optionally, as shown in Figures 8 to 11, the photovoltaic module also has a first cross-section, which is perpendicular to the surface of the battery cell 10 and passes through the first area 80; at the first cross-section, the bonding layer 22 includes an arc-shaped structure 221 arranged on the side of the connecting wire base 21 away from the battery cell 10 and a rectangular structure 222 arranged on the side of the connecting wire base 21 close to the battery cell 10.

[0088] The photovoltaic module disclosed in the embodiments of the present application has a first cross-section and a second cross-section, which are parallel and perpendicular to the plane of the cell 10. The first cross-section passes through the first region 80, and the second cross-section passes through the second region 81. Specifically, Figures 8 and 9 illustrate the structure of the bonding layer 22 at the first cross-section, and Figures 10 and 11 illustrate the structure of the bonding layer 22 at the second cross-section.

[0089] As shown in Figures 8 and 9, at the first cross section, the bonding layer 22 includes an arc-shaped structure 221 surrounding the side of the connecting wire base 21 away from the battery cell 10, and a rectangular structure 222 surrounding the side of the connecting wire base 21 close to the battery cell 10. The arc-shaped structure 221 and the rectangular structure 222 cover the surface of the connecting wire base 21 that is not in contact with the fine grid line 11, so that the connecting wire 20 can be electrically connected to the fine grid line 11 not only through the connecting wire base 21, but also through the bonding layer 22 formed by the arc-shaped structure 221 and the rectangular structure 222. This allows the connecting wire 20 to be better electrically connected to the fine grid line 11, so as to collect the current collected by the fine grid line 11, thereby improving the photoelectric conversion efficiency of the battery cell 10.

[0090] Optionally, as shown in FIG. 8 and FIG. 9 , a chamfered structure 223 is provided at a connection between the rectangular structure 222 and the battery cell 10 .

[0091] As shown in Figures 8 and 9, the chamfered structure 223 is provided at the connection between the rectangular structure 222 and the cell 10 in the embodiment of the present application. After lamination, the rectangular structure 222 and the fine grid lines 11 are alloyed and interconnected in the photovoltaic module. The chamfered structure 223 is provided at the connection between the rectangular structure 222 and the cell 10 to increase the contact area between the rectangular structure 222 and the fine grid lines 11, thereby preventing the rectangular structure 222 from separating from the fine grid lines 11.

[0092] Optionally, as shown in FIG. 8 and FIG. 9 , at the first region 80 , the bonding layer 22 completely fills the first region 80 .

[0093] As shown in Figures 8 and 9, the photovoltaic module disclosed in the embodiment of the present application has a first region 80 completely filled with a bonding layer 22, thereby improving the reliability of the connection between the connecting wire 20 and the fine grid line 11. The connecting wire 20 can be better electrically connected to the fine grid line 11 to collect the current collected by the fine grid line 11, thereby improving the photoelectric conversion efficiency of the solar cell 10.

[0094] Optionally, as shown in FIG. 10 and FIG. 11 , at the second region 81 , a first gap 23 exists between at least a portion of the bonding layer 22 and the surface of the battery cell 10 , and the first gap 23 is not filled by the bonding layer 22 .

[0095] As shown in Figures 10 and 11 , in the photovoltaic module disclosed in the embodiments of the present application, a first gap 23 is provided between at least a portion of the bonding layer 22 and the solar cell 10 in the second region 81, and the bonding layer 22 is not filled in the first gap 23. In other words, the bonding layer 22 does not completely cover the surface of the connecting wire substrate 21, thereby reducing the amount of bonding layer 22 material used and saving the production cost of the photovoltaic module.

[0096] Furthermore, since the projection of the second region 81 on the cell 10 is between two adjacent fine grid lines 11, the bonding layer 22 in the second region 81 is not connected to the fine grid lines 11. Therefore, the absence of the bonding layer 22 on the surface of the portion of the connecting wire substrate 21 in this region will not affect the current collection on the surface of the cell 10.

[0097] Optionally, as shown in FIG. 1 , the photovoltaic module further includes a fixing layer 30 , which is disposed on a side of the connecting wire 20 away from the solar cell 10 , and is used to fix the connecting wire 20 to the surface of the solar cell 10 .

[0098] As shown in Figure 1, the photovoltaic module disclosed in the embodiment of the present application further includes a fixing layer 30. In the embodiment of the present application, the fixing layer 30 is disposed on the side of the connecting wire 20 away from the cell 10, so that the connecting wire 20 is fixed to the surface of the cell 10 via the fixing layer 30. Compared to spot welding the connecting wire 20 to the surface of the cell 10, the method of fixing the connecting wire 20 to the surface of the cell 10 via the fixing layer 30 in the present application is more efficient and less costly.

[0099] Specifically, during the processing of a photovoltaic module, multiple connecting wires 20 can be arranged at intervals on the surface of a cell 10, and then a fixing layer 30 can be disposed on the side of the connecting wires 20 away from the cell 10. The fixing layer 30 is then thermally or photocured so that the fixing layer 30 is at least partially bonded to the surface of the cell 10, thereby securing the connecting wires 20 to the surface of the cell 10 via the fixing layer 30. Finally, the photovoltaic module is laminated to electrically connect the bonding layer 22 and / or the connecting wire matrix 21 to the cell 10.

[0100] Optionally, as shown in FIG. 13 , along a direction perpendicular to the plane where the battery cell 10 is located, the fixing layer 30 has a first projection, and the first projection falls into the battery cell 10 .

[0101] As shown in FIG13 , the fixed layer 30 in the embodiment of the present application has a first projection along a direction perpendicular to the plane where the battery cell 10 is located, and the first projection falls into the battery cell 10. This is to avoid the area of ​​the fixed layer 30 being too large and extending beyond the edge of the battery cell 10. When the area of ​​the fixed layer 30 is too large and extends beyond the edge of the battery cell 10, if the extended portion is located between two adjacent battery strings, it may cause the battery cell 10 to shift, adversely affecting the electrical connection between the battery cells 10. If the extended portion is located between two adjacent battery cells 10, then during the lamination process of the photovoltaic module, the extended portion will cause a greater pulling force on the connecting wire 20 between the two adjacent battery cells 10, thereby affecting the extension length of the connecting wire 20 on the battery cell 10, resulting in poor current collection at the edge of the battery cell 10.

[0102] Optionally, as shown in Figure 3, the photovoltaic module also includes: a plurality of glue points 70 arranged at intervals along the extension direction of the connecting wire 20, the glue points 70 are arranged between the connecting wire 20 and the surface of the battery cell 10, and the glue points 70 are used to fix the connecting wire 20 to the surface of the battery cell 10.

[0103] As shown in FIG3 , the photovoltaic module in the embodiment of the present application is provided with glue points 70. The glue points 70 include a plurality of glue points 70, which are arranged at intervals along the extension direction of the connecting wire 20, i.e., the second direction K. The connecting wire 20 is bonded to the surface of the cell 10 through the glue points 70. Compared to welding the connecting wire 20 to the surface of the cell 10 by spot welding, the method of bonding the connecting wire 20 to the surface of the cell 10 by glue points 70 in the present application is more efficient and less costly.

[0104] Specifically, during the processing of the photovoltaic module, the glue dots 70 can be first arranged at intervals along the second direction K on the surface of the cell 10, and then the connecting wires 20 can be provided on the surface of the cell 10, so that the connecting wires 20 are located on the side of the glue dots 70 away from the cell 10 and extend along the second direction K. The glue dots 70 are then thermally or light-cured, so that the connecting wires 20 can be bonded to the surface of the cell 10 through the glue dots 70. Finally, the photovoltaic module is laminated to electrically connect the bonding layer 22 and / or the connecting wire matrix 21 to the cell 10.

[0105] Optionally, the melting point of the bonding layer 22 is less than 165 degrees, and the bonding layer 22 includes at least one of a tin-lead-bismuth layer, a tin-bismuth-silver layer, or a tin-indium layer.

[0106] The bonding layer 22 in the embodiment of the present application is electrically conductive and has a melting point less than 165°C. During the photovoltaic module lamination process, the bonding layer 22 can be alloyed and interconnected with the fine grid lines 11. This electrically connects the bonding layer 22 to the fine grid lines 11, allowing the current collected by the fine grid lines 11 to be collected through the connecting wires 20.

[0107] It should be noted that the bonding layer 22 in the embodiments of the present application can be a tin-lead-bismuth layer, a tin-bismuth-silver layer, or a tin-indium layer. Of course, the bonding layer 22 can also be other conductive metal layers with a melting point less than 165 degrees. In the embodiments of the present application, there are no excessive restrictions on this. In actual use, technicians can set a suitable bonding layer 22 as needed.

[0108] Optionally, as shown in Figures 1 to 3, the photovoltaic module further includes: an adhesive layer 40 and a cover plate 50 or a back plate 60, wherein the adhesive layer 40 and the cover plate 50 or the back plate 60 are sequentially arranged on the side of the connecting line 20 away from the battery cell 10, so as to connect the cover plate 50 or the back plate 60 to the battery cell 10 through the adhesive layer 40.

[0109] As shown in Figures 1 to 3, the photovoltaic module in the embodiment of the present application further includes an adhesive layer 40, a cover plate 50, and / or a back plate 60. The adhesive layer 40 is disposed on the side of the connecting wire 20 away from the solar cell 10, and the cover plate 50 or the back plate 60 is then bonded to the side of the adhesive layer 40 away from the connecting wire 20. Thus, the cover plate 50 or the back plate 60 is bonded to one side of the solar cell 10 via the adhesive layer 40, thereby securing and protecting the solar cell 10 via the cover plate 50 or the back plate 60.

[0110] Optionally, as shown in Figures 1 to 3, the battery cell 10 in the embodiment of the present application includes multiple battery cells 10, and the multiple battery cells 10 are arranged at intervals, and there is a second gap between two adjacent battery cells 10; along the direction perpendicular to the plane where the battery cells 10 are located, a glue layer 40 is provided in the second gap.

[0111] As shown in Figures 1 to 3, the battery cells 10 in the embodiments of the present application typically include a plurality of battery cells 10, which are arranged in a first direction H or a second direction K, with a second gap between adjacent battery cells 10. An adhesive layer 40 is disposed in the second gap in a direction perpendicular to the plane of the battery cells 10. Furthermore, no fixing layer 30 is disposed in the second gap.

[0112] As shown in Figures 1 to 3, in the embodiment of the present application, only the adhesive layer 40 is provided in the second gap between two adjacent solar cells 10, without the fixing layer 30. This is to prevent the fixing layer 30 from exerting a large pulling force on the connecting wire 20 between the two adjacent solar cells 10 during the photovoltaic module lamination process, thereby reducing the extension length of the connecting wire 20 on the solar cell 10 and causing poor current collection at the edge of the solar cell 10.

[0113] Optionally, the fixing layer 30 is a single-layer structure, and the single-layer structure is an EVA layer.

[0114] In the embodiment of the present application, the fixing layer 30 can be set as a single layer structure, and the single layer structure is set as a pre-crosslinked EVA layer. The pre-crosslinked EVA layer has advantages such as low fluidity and low cost. Among them, EVA is also called ethylene-vinyl acetate copolymer.

[0115] Of course, the fixing layer 30 can also be configured as a multi-layer structure. For example, the fixing layer 30 can be configured as a double-layer structure, or the fixing layer 30 can be configured as a three-layer structure. In this regard, the embodiments of the present application do not impose too many restrictions. In actual use, technicians can configure it as needed.

[0116] Optionally, the fixing layer 30 is a double-layer structure including an EVA layer and a POE layer, wherein the EVA layer is arranged on a side of the fixing layer 30 close to the battery cell 10 , and the EVA layer is partially connected to the battery cell 10 .

[0117] It should be noted that pre-crosslinked EVA layers offer advantages such as low fluidity and low cost. EVA is also known as ethylene-vinyl acetate copolymer. Pre-crosslinked POE layers offer excellent resistance to PID effects. POE comes in two types: a polymer of ethylene and butene, and a polymer of ethylene and octene.

[0118] In the embodiment of the present application, an EVA layer is disposed on the side of the fixing layer 30 close to the cell 10, and the connecting wire 20 is fixed to the surface of the cell 10 via the EVA layer to improve the reliability of the connection between the connecting wire 20 and the cell 10. The POE layer has good resistance to the PID effect. By disposing the POE layer on the side of the fixing layer 30 away from the cell 10, the photovoltaic module can improve its resistance to the PID effect.

[0119] As shown in Figure 7, in another embodiment of the present application, at least one main grid line 12 is further provided on the battery cell 10, and at least one main grid line 12 extends along a first direction H; along a direction perpendicular to the plane where the battery cell 10 is located, the projection of at least one main grid line 12 on the battery cell 10 is staggered with the projection of the connecting line 20 on the battery cell 10.

[0120] As shown in FIG7 , in another embodiment of the present application, at least one busbar 12 is further provided on the surface of the cell 10, and the at least one busbar 12 extends along a second direction K. Furthermore, along a direction perpendicular to the plane where the cell 10 is located, the projection of the at least one busbar 12 on the cell 10 and the projection of the connecting wire 20 on the cell 10 are staggered. This allows the at least one busbar 12 and the plurality of connecting wires 20 to be respectively connected to the plurality of fine grid lines 11, so that the current collected by the plurality of fine grid lines 11 is collected by the at least one busbar 12 and the plurality of connecting wires 20, thereby improving the photoelectric conversion efficiency of the cell 10.

[0121] Optionally, as shown in FIG7 , along a second direction K perpendicular to the first direction H, the battery cell 10 has a first side surface and a second side surface that are arranged opposite to each other; the main grid lines 12 include two, one main grid line 12 is arranged in an area of ​​the surface of the battery cell 10 close to the first side surface, and the other main grid line 12 is arranged in an area of ​​the surface of the battery cell 10 close to the second side surface. As shown in FIG7 , in an embodiment of the present application, two main grid lines 12 are arranged on the surface of the battery cell 10. One main grid line 12 is arranged in an area of ​​the surface of the battery cell 10 close to the first side surface, so as to collect the current at the area of ​​the surface of the battery cell 10 close to the first side surface through the main grid line 12. The other main grid line 12 is arranged in an area of ​​the surface of the battery cell 10 close to the second side surface, so as to collect the current at the area of ​​the surface of the battery cell 10 close to the second side surface through the main grid line 12.

[0122] Optionally, the length of the battery cell 10 is greater than or equal to 180 mm and less than or equal to 240 mm.

[0123] The length of the battery cell 10 in the embodiment of the present application is greater than or equal to 180 mm and less than or equal to 240 mm. Specifically, the length of the battery cell 10 can be 180 mm, 182 mm, 191.6 mm, 191.75 mm, 192, 210 mm, 220 mm, 230 mm, 240 mm, etc.

[0124] Exemplarily, the battery cell 10 may be a rectangular structure, and the specific dimensions of the rectangular structure battery cell 10 may include: (182±2)mm*(96±1)mm, (192±2)mm*(91±1)mm, (182±2)mm*(91±1)mm, (182±2)mm*(105±1)mm, etc.

[0125] Of course, in the embodiment of the present application, there is no limitation on the specific structure and size of the battery cell 10. Battery cells 10 of any structure and any size fall within the scope of protection of the present application. In actual use, technicians can select a suitable battery cell as the battery cell 10 as needed.

[0126] The present application discloses an embodiment of a photovoltaic module, comprising: a cell, the surface of which is provided with a plurality of fine grid lines arranged at intervals along a first direction; a connecting wire, the connecting wire being provided on the surface of the cell and intersecting the fine grid lines, the connecting wire comprising a connecting wire base and a bonding layer attached to the surface of the connecting wire base; wherein the photovoltaic module has a first region and a second region, both of which are located between the connecting wire base and the surface of the cell, the projection of the first region on the cell is on the fine grid lines, and the projection of the second region on the cell is between the fine grid lines; the filling ratio of the bonding layer in the first region is greater than the filling ratio of the bonding layer in the second region. The photovoltaic module in the embodiment of the present application has a first region and a second region, both of which are located between the connecting wire base and the surface of the cell, the projection of the first region on the cell is on the fine grid lines, and the projection of the second region on the cell is between the fine grid lines. In the embodiment of the present application, the filling ratio of the bonding layer in the first region is set to be greater than the filling ratio of the bonding layer in the second region. This allows the connecting wires to be better electrically connected to the fine grid lines, and the current at the fine grid lines is collected through the connecting wires, thereby improving the photoelectric conversion efficiency of the solar cell.

[0127] As shown in Figures 5 to 7, the photovoltaic module disclosed in the embodiment of the present application includes: a battery cell 10, a first surface 16 of the battery cell 10 is provided with a plurality of first fine grid lines 111 arranged at intervals along the first direction H, and a second surface 17 of the battery cell 10 is provided with a plurality of second fine grid lines 112 arranged at intervals along the first direction H; a third connecting line 26 and a fourth connecting line 27, the third connecting line 26 is provided on the first surface 16 of the battery cell 10 and intersects with the first fine grid lines 111, the fourth connecting line 27 is provided on the second surface 17 of the battery cell 10 and intersects with the second fine grid lines 112, the third connecting line 26 and the fourth connecting line 27 both include a connecting line base 21 and a bonding layer 22 attached to the surface of the connecting line base 21; wherein, the filling ratio of the bonding layer 22 between the connecting line base 21 of the third connecting line 26 and the first surface 16 is greater than the filling ratio of the bonding layer 22 between the connecting line base 21 of the fourth connecting line 27 and the second surface 17.

[0128] As shown in Figures 5 to 7, the battery cell 10 in the embodiment of the present application has a first surface 16 and a second surface 17. The first surface 16 is the light-receiving surface of the battery cell 10, that is, the side facing the sunlight. The second surface 17 is the backlight side of the battery cell 10, that is, the side facing away from the sunlight. Among them, a plurality of first fine grid lines 111 are arranged at intervals along the first direction H and extending along the second direction K on the first surface 16 of the battery cell 10. The current generated by the first surface 16 of the battery cell 10 is collected by the first fine grid lines 111. The second surface 17 of the battery cell 10 is also provided with a plurality of second fine grid lines 112 arranged at intervals along the first direction H and extending along the second direction K. The current generated by the second surface 17 of the battery cell 10 is collected by the second fine grid lines 112.

[0129] The photovoltaic assembly disclosed in the embodiment of the present application also includes a third connecting line 16 and a fourth connecting line 27. The third connecting line 26 is arranged on the first surface 16 of the battery cell 10 and intersects with the first fine grid line 111. Specifically, a plurality of third connecting lines 26 can be provided, and the plurality of third connecting lines 26 are arranged on the first surface 16 of the battery cell 10 at intervals along the second direction K, and the plurality of third connecting lines 26 all extend along the first direction H. The fourth connecting line 27 is provided on the second surface 17 of the battery cell 10 and intersects with the second fine grid line 112. Specifically, a plurality of fourth connecting lines 27 can also be provided, and the plurality of fourth connecting lines 27 are arranged on the second surface 17 of the battery cell 10 at intervals along the second direction K, and the plurality of fourth connecting lines 27 all extend along the first direction H.

[0130] The third connecting wire 26 and the fourth connecting wire 27 in the embodiment of the present application both include a connecting wire base 21 and a bonding layer 22 attached to the connecting wire base 21. Both the connecting wire base 21 and the bonding layer 22 are conductive. The connecting wire base 21 is usually a copper wire. For example, the connecting wire base 21 can be an oxygen-free copper wire. Of course, the connecting wire base 21 can also be other metal wires, such as aluminum wire, etc. In the embodiment of the present application, there are no excessive restrictions on the specific material of the connecting wire base 21. In actual use, technicians can select a suitable material as needed.

[0131] The bonding layer 22 may be a tin-lead-bismuth layer, a tin-bismuth-silver layer, or a tin-indium layer. Of course, the bonding layer 22 may also be any other conductive metal layer having a melting point less than 165 degrees Celsius. In the embodiments of the present application, there are no additional restrictions on the specific material of the bonding layer 22. In actual use, technicians can select an appropriate material as needed.

[0132] As shown in Figures 5 to 7, in the embodiment of the present application, the filling ratio of the bonding layer 22 between the bonding wire base 21 of the third bonding wire 26 and the first surface 16 of the cell 10 is greater than the filling ratio of the bonding layer 22 between the bonding wire base 21 of the fourth bonding wire 27 and the second surface 17 of the cell 10. In other words, the filling ratio of the bonding layer 22 between the light-receiving surface of the cell 10 and the corresponding bonding wire base 21 is greater than the filling ratio of the bonding layer 22 between the backlight surface of the cell 10 and the corresponding bonding wire base 21.

[0133] It should be noted that the filling ratio in the embodiment of the present application refers to the ratio of the volume of the bonding layer 22 material to the volume of the corresponding area, and the corresponding area refers to the area between the connecting wire substrate and the surface of the battery cell (including the fine grid), and its boundary generally includes the positive projection of the connecting wire substrate on the surface of the battery cell. For example, in the embodiment of the present application, the volume of the bonding layer 22 between the connecting wire substrate 21 of the third connecting wire 26 and the first surface 16 of the battery cell 10 can be set to account for more than 50% of the area between the connecting wire substrate 21 of the third connecting wire 26 and the first surface 16 of the battery cell 10. The volume of the bonding layer 22 between the connecting wire substrate 21 of the fourth connecting wire 27 and the second surface 17 of the battery cell 10 is set to account for less than 50% of the area between the connecting wire substrate 21 of the fourth connecting wire 27 and the second surface 17 of the battery cell 10.

[0134] As shown in FIG5 , the first surface 16 of the cell 10, i.e., the light-receiving surface of the cell 10, serves as the main power generation portion of the cell 10. A relatively complete bonding layer 22 is filled between the first surface 16 and the corresponding connecting wire substrate 21. The bonding layer 22 allows the corresponding connecting wire substrate 21 to be reliably connected to the first fine grid lines 111 on the first surface 16. This allows the third connecting wires 26 to be better electrically connected to the first fine grid lines 111, thereby converging the current collected by the first fine grid lines 111 and improving the photoelectric conversion efficiency of the cell 10.

[0135] As shown in Figures 6 and 7, the second surface 17 of the cell 10, i.e., the backlight surface of the cell 10, serves as the secondary power generation portion of the cell 10. A mottled bonding layer 22 is filled between the second surface 17 and the corresponding connecting wire substrate 21. Specifically, the bonding layer 22 and the corresponding areas of the second fine grid lines 112 can be arranged in a continuous structure, while the corresponding areas between the bonding layer 22 and the second fine grid lines 112 can be arranged in a mottled structure. This allows for a better electrical connection between the second fine grid lines 112 on the second surface 17 and the corresponding connecting wire substrate 21 while conserving material for the bonding layer 22.

[0136] Based on the above description, as shown in Figures 5 to 7 , in the embodiment of the present application, the filling ratio of the bonding layer 22 between the connecting wire base 21 of the third connecting wire 26 and the first surface 16 of the cell 10 is set to be greater than the filling ratio of the bonding layer 22 between the connecting wire base 21 of the fourth connecting wire 27 and the second surface 17 of the cell 10. This ensures the photoelectric conversion efficiency of the cell 10 while reducing the production cost of the photovoltaic module.

[0137] Optionally, the number of the first fine gate lines 111 on the first surface 16 is less than the number of the second fine gate lines 112 on the second surface 17 .

[0138] In the embodiment of the present application, a first fine grid line 111 is provided on the first surface 16 of the cell 10 to collect the current generated on the first surface 16 of the cell 10. A second fine grid line 112 is provided on the second surface 17 of the cell 10 to collect the current generated on the second surface 17 of the cell 10.

[0139] As shown in Figure 5, the space between the first surface 16 of the battery cell 10 and the connecting wire base 21 of the third connecting wire 26 is completely filled with the bonding layer 22, so that the bonding layer 22 at the position between the first fine grid lines 111 can directly contact the first surface 16 of the battery cell 10 to collect the current generated by the first surface 16 of the battery cell 10, thereby compensating for the problem of the small number of first fine grid lines 111 on the first surface 16 of the battery cell 10.

[0140] As shown in Figures 6 and 7, the area between the second surface 17 of the cell 10 and the connecting wire base 21 of the fourth connecting wire 27 is not completely filled with the bonding layer 22. Specifically, the areas corresponding to the bonding layer 22 of the fourth connecting wire 27 and the second fine grid lines 112 are arranged in a continuous structure, while the areas corresponding to the bonding layer 22 of the fourth connecting wire 27 and the second fine grid lines 112 are arranged in a mottled structure. Therefore, in the embodiment of the present application, the number of second fine grid lines 112 is set to be greater than the number of first fine grid lines 111, so that the current generated on the second surface 17 of the cell 10 can be collected by a larger number of second fine grid lines 112, thereby improving the photoelectric conversion efficiency of the cell 10. Optionally, as shown in Figures 8 to 12, the photovoltaic module in the embodiment of the present application has a first area 80 and a second area 81, both of which are located between the connecting wire base 21 of the fourth connecting wire 27 and the second surface 17, the projection of the first area 80 on the battery cell 10 is on the second fine grid line 112, and the projection of the second area 81 on the battery cell 10 is between the second fine grid lines 112; the filling ratio of the bonding layer 22 at the first area 80 is greater than the filling ratio of the bonding layer 22 at the second area 81.

[0141] As shown in Figures 8 to 12, in the embodiment of the present application, the area between the connecting wire base 21 of the fourth connecting wire 27 and the second surface 17 of the battery cell 10 is referred to as the first area 80 and the second area 81. Specifically, the first area 80 runs through the second fine grid lines 112, that is, the projection of the first area 80 on the battery cell 10 is on the second fine grid lines 112. The second area 81 runs between the second fine grid lines 112, that is, the projection of the second area 81 on the battery cell 10 is between the second fine grid lines 112.

[0142] In the embodiment of the present application, the filling ratio of the bonding layer 22 in the first region 80 is set to be greater than the filling ratio of the bonding layer 22 in the second region 81. This allows the fourth connecting wire 27 to be better electrically connected to the second fine grid line 112, so that the current collected by the second fine grid line 112 is collected through the fourth connecting wire 27, thereby improving the photoelectric conversion efficiency of the solar cell 10.

[0143] Optionally, as shown in FIG8 and FIG10 , the cross-sections of the connecting wire base 21 of the third connecting wire 26 and the connecting wire base 21 of the fourth connecting wire 27 in the embodiment of the present application are both circular, and the diameters of the circles are the same.

[0144] As shown in Figures 8 and 10 , the third and fourth connecting wires 26 and 27 in the embodiment of the present application are both long strips, and the cross-sections of the third and fourth connecting wires 26 and 27 are both circular. Furthermore, in the embodiment of the present application, the cross-sectional diameter of the third and fourth connecting wires 26 is set to be the same as the cross-sectional diameter of the fourth connecting wires 27 to facilitate the processing of the photovoltaic module.

[0145] Optionally, as shown in FIG. 5 to FIG. 7 , the filling amount of the bonding layer 22 between the third connection line 26 and the first surface 16 is greater than the filling amount of the bonding layer 22 between the fourth connection line 27 and the second surface 17 .

[0146] As shown in FIG5 , a relatively complete bonding layer 22 is filled between the bonding wire base 21 of the third bonding wire 26 in the embodiment of the present application and the first surface 16 of the cell 10. As shown in FIG6 and FIG7 , a mottled bonding layer 22 is filled between the bonding wire base 21 of the fourth bonding wire 27 in the embodiment of the present application and the second surface 17 of the cell 10. It is understood that the amount of bonding layer 22 filled between the third bonding wire 26 and the first surface 16 is greater than the amount of bonding layer 22 filled between the fourth bonding wire 27 and the second surface 17. This ensures the photoelectric conversion efficiency of the cell 10 while reducing the production cost of the photovoltaic module.

[0147] It should be noted that the cell 10 in the embodiment of the present application can be a heterojunction cell, a Topcon cell, or a PERC cell. Of course, the cell 10 in the embodiment of the present application can also be any other type of cell. In the embodiment of the present application, there are no excessive restrictions on the specific type of cell 10. In actual use, technicians can select an appropriate cell 10 as needed.

[0148] Optionally, the cell 10 further includes a transparent conductive layer, which is disposed on the first surface 16 and the second surface 17 ; wherein the third connecting line 26 and / or the fourth connecting line 27 are electrically connected to the transparent conductive layer through the bonding layer 22 .

[0149] In the embodiment of the present application, a transparent conductive layer may be provided on the first surface 16 and the second surface 17 of the cell 10. The third connecting wire 26 may be electrically connected to the transparent conductive layer on the first surface 16 via the bonding layer 22 to improve the reliability of the connection between the third connecting wire 26 and the first surface 16 of the cell 10. The fourth connecting wire 27 may be electrically connected to the transparent conductive layer on the second surface 17 via the bonding layer 22 to improve the reliability of the connection between the fourth connecting wire 27 and the second surface 17 of the cell 10.

[0150] It should be noted that, as shown in FIG6 , the battery cell 10 in the embodiment of the present application can be a battery cell without a busbar. As shown in FIG7 , the battery cell 10 in the embodiment of the present application can also be a battery cell with a busbar. In the embodiment of the present application, there is no specific limitation on this. In actual use, technicians can select an appropriate battery cell as needed.

[0151] Referring to Figure 15, there is shown a first flow chart for preparing the photovoltaic module described in the embodiment of the present application; referring to Figure 16, there is shown a second flow chart for preparing the photovoltaic module described in the embodiment of the present application; referring to Figure 17, there is shown a third flow chart for preparing the photovoltaic module described in the embodiment of the present application; referring to Figure 18, there is shown a fourth flow chart for preparing the photovoltaic module described in the embodiment of the present application; and referring to Figure 19, there is shown a fifth flow chart for preparing the photovoltaic module described in the embodiment of the present application.

[0152] As shown in FIG15 to FIG19 , the embodiment of the present application discloses a method for preparing a photovoltaic module, the method comprising the following steps:

[0153] (1) A connecting line 20 is provided on at least one surface of a battery cell 10; wherein, a plurality of fine grid lines 11 arranged at intervals along a first direction H are provided on the surface of the battery cell 10, and the connecting lines 20 intersect at the fine grid lines 20, and the connecting lines 20 include a connecting line base 21 and a bonding layer 22 attached to the surface of the connecting line base 21.

[0154] Specifically, the method of providing the connecting wire 20 on at least one surface of the battery cell 10 includes: providing a plurality of glue dots 70 at intervals on the surface of the battery cell 10 along the extension direction of the connecting wire 20, and laying the connecting wire 20 on a side of the plurality of glue dots 70 away from the battery cell 10. The connecting wire 20 is adhered to the surface of the battery cell 10 by the plurality of glue dots 70.

[0155] Alternatively, after the connection wire 20 is disposed on at least one surface of the battery cell 10 , the fixing layer 30 is disposed on a side of the connection wire 20 away from the battery cell 10 to form a stacked structure.

[0156] The stacked structure in the embodiment of the present application can sequentially set a connecting wire 20 and a fixing layer 30 on one surface of the battery cell 10, and sequentially set another connecting wire 20 and another fixing layer 30 on the other surface of the battery cell 10, and the adjacent two battery cells 10 are connected by the same connecting wire 20.

[0157] Exemplarily, a method of forming a stacked structure by disposing a connecting wire 20 on at least one surface of a battery cell 10 and disposing a fixing layer 30 on a side of the connecting wire 20 away from the battery cell 10 includes:

[0158] As shown in FIG15 , a first fixing layer 31 is provided and laid on the platform. The first fixing layer 31 is a pre-crosslinked polymer adhesive layer. The pre-crosslinked polymer adhesive layer can be a pre-crosslinked EVA layer or a pre-crosslinked POE layer. Of course, the pre-crosslinked polymer adhesive layer can also include any other pre-crosslinked polymer adhesive layer. This embodiment of the present application does not impose any specific limitations on this. In actual use, technicians can make a selection as needed.

[0159] As shown in FIG15 , a plurality of first connecting wires 24 are provided and arranged at intervals along the second direction K on the surface of the first fixing layer 31. In the embodiment of the present application, the first connecting wires 24 include a connecting wire base 21 and a bonding layer 22 attached to the surface of the connecting wire base 21. Both the connecting wire base 21 and the bonding layer 22 are electrically conductive. The connecting wire base 21 is typically a copper strip. The bonding layer 22 is typically a tin-lead-bismuth layer, a tin-bismuth-silver layer, or a tin-indium layer.

[0160] As shown in FIG15 , a first cell 13 is provided and placed on a side of a first connecting wire 24 away from a first fixing layer 31, so that the first connecting wire 24 is fixed to the surface of the first cell 13 via the first fixing layer 31. Compared to spot welding the first connecting wire 24 to the surface of the first cell 13, the method of fixing the first connecting wire 24 to the surface of the first cell 13 via the first fixing layer 31 in the present application is more efficient and less costly.

[0161] As shown in Figure 16, a second fixing layer 32 is provided and arranged on the platform with a gap between the second fixing layer 32 and the first fixing layer 31 along the first direction H. The second fixing layer 32 is the same as the first fixing layer 31, and is a pre-crosslinked polymer adhesive material layer.

[0162] As shown in FIG17 , second connecting wires 25 are provided. A portion of the second connecting wires 25 is arranged at intervals along the second direction K on the surface of the first battery cell 13 away from the first connecting wires 24. Another portion of the second connecting wires 25 is extended to the second fixing layer 32 and arranged at intervals along the second direction K on the surface of the second fixing layer 22. The second connecting wires 25 are identical to the first connecting wires 24, both comprising a connecting wire base 21 and a bonding layer 22 attached to the surface of the connecting wire base 21. Both the connecting wire base 21 and the bonding layer 22 are electrically conductive. The connecting wire base 21 is typically a copper strip. The bonding layer 22 is typically one of a tin-lead-bismuth layer, a tin-bismuth-silver layer, and a tin-indium layer.

[0163] As shown in FIG18 , a third fixing layer 33 is provided and laid on the side of the second connecting wire 25 away from the first battery cell 13. The second connecting wire 25 is thus fixed to the other surface of the first battery cell 13 via the third fixing layer 33. The third fixing layer 33, like the first fixing layer 31, is also a pre-crosslinked polymer adhesive material layer.

[0164] As shown in FIG19 , a second cell 14 is provided and placed on a side of the second connecting wire 25 away from the second fixing layer 32 . The second connecting wire 25 is thus fixed to the surface of the second cell 14 via the second fixing layer 32 , allowing the second connecting wire 25 to conduct electricity between the first cell 13 and the second cell 14 .

[0165] It should be noted that the surface of the first cell 13 in the embodiment of the present application is provided with a plurality of fine grid lines 11 arranged at intervals along a first direction H and extending along a second direction K, where the second direction K is perpendicular to the first direction H. The fine grid lines 11 are conductive. Metal paste can be printed on the surface of the first cell 13 using screen printing to form the fine grid lines 11 on the surface of the first cell 13, thereby collecting the current generated by the first cell 13 through the fine grid lines 11.

[0166] The second cell 14 is similar to the first cell 13 and is also provided with a plurality of fine grid lines 11 arranged at intervals along the first direction H and extending along the second direction K. The fine grid lines 11 are conductive. Metal paste can be printed on the surface of the second cell 14 using screen printing to form the fine grid lines 11 on the surface of the second cell 14, thereby collecting the current generated by the second cell 14 through the fine grid lines 11.

[0167] (2) The battery cell 10 and the connecting wire 20 are heated to fix the connecting wire 20 to the surface of the battery cell 10 .

[0168] Specifically, the stacked structure may be heated to fix the connecting wires 20 to the surface of the battery cell 10 through the fixing layer 30 .

[0169] Exemplarily, the method of heating the stacked structure to fix the connecting wire 20 to the surface of the battery cell 10 through the fixing layer 30 includes:

[0170] The stacked structure is preheated to melt the first fixing layer 31 , the second fixing layer 32 and the third fixing layer 33 , thereby connecting the first connecting wire 24 and the second connecting wire 25 to the surface of the battery cell 10 through the first fixing layer 31 , the second fixing layer 32 and the third fixing layer 33 .

[0171] Illustratively, the stacked structure may be preheated by thermal curing or photocuring so that the first fixing layer 31 and the third fixing layer 33 are at least partially bonded to the surface of the first battery cell 13, and the second fixing layer 32 is at least partially bonded to the surface of the second battery cell 14, thereby fixing the first connecting wire 24 to the surface of the first battery cell 13 through the first fixing layer 31, fixing a portion of the second connecting wire 25 to the other surface of the first battery cell 13 through the second fixing layer 32, and fixing another portion of the second connecting wire 25 to the surface of the second battery cell 14 through the third fixing layer 33.

[0172] (3) Providing a sealing layer to seal the heated battery cell 10 through the sealing layer.

[0173] Specifically, a sealing layer is provided, and the heated stacked structure is sealed by the sealing layer.

[0174] Exemplarily, the specific method of sealing the heated stacked structure by the sealing layer includes:

[0175] An adhesive layer 40 and a cover plate 50 or a back plate 60 are provided and can be sequentially disposed on a side of the first fixing layer 31 away from the first connecting wire 24. The photovoltaic module is then laminated so that the first connecting wire 24 is electrically connected to the first cell 13. The cover plate 50 or the back plate 60 is bonded to one side of the first cell 13 via the first fixing layer 31 and the adhesive layer 40, thereby securing and protecting the first cell 13 via the cover plate 50 or the back plate 60.

[0176] It should be noted that the photovoltaic module disclosed in the embodiment of the present application also has a first region 80 and a second region 81. The first region 80 is located between the connecting wire substrate 21 and the surface of the cell 10, and the projection of the first region 80 on the cell 10 is on the fine grid lines 11. The second region 81 is also located between the connecting wire substrate 21 and the surface of the cell 10, and the projection of the second region 81 on the cell 10 is between two adjacent fine grid lines 11.

[0177] As shown in Figures 6, 7 and 12, in the embodiment of the present application, the bonding layer 22 at the first region 80 is set to a continuous structure, and the bonding layer 22 at the second region 81 is set to a mottled structure, so that the filling ratio of the bonding layer 22 at the first region 80 is greater than the filling ratio of the bonding layer 22 at the second region 81. In the embodiment of the present application, by setting the filling ratio of the bonding layer 22 at the first region 80 to be greater than the filling ratio of the bonding layer 22 at the second region 81, the connecting wire 20 can be better electrically connected to the fine grid line 11, and the current at the fine grid line 11 is collected by the connecting wire 20 to improve the photoelectric conversion efficiency of the battery cell 10.

[0178] In another embodiment of the present application, as shown in FIG14 , the stacked structure may also have the connecting wires 20 and the fixing layer 30 only provided on one surface of the battery cell 10 , and no connecting wires 20 and the fixing layer 30 provided on the other surface of the battery cell 10 .

[0179] In the embodiment of the present application, the method of forming a stacked structure by disposing a connecting wire 20 on at least one surface of the battery cell 10 and disposing a fixing layer 30 on a side of the connecting wire 20 away from the battery cell 10 further includes:

[0180] Providing at least two fixing layers 30, and arranging the at least two fixing layers 30 at intervals;

[0181] Providing a connecting line 20, laying a portion of the connecting line 20 on a fixing layer 30, and extending another portion of the connecting line 20 to an adjacent fixing layer 30 and laying it on the adjacent fixing layer 30;

[0182] At least two battery cells 10 are provided, and the battery cells 10 are stacked on a side of the connecting wire 20 away from the fixing layer 30 , so that each battery cell 10 is disposed corresponding to one fixing layer 30 .

[0183] For example, as shown in FIG14 , the method for preparing a back-contact photovoltaic module includes:

[0184] A first fixing layer 31 and a fourth fixing layer 34 are provided and arranged on the platform at intervals along a first direction H. The fourth fixing layer 34 is the same as the first fixing layer 31 and is also a pre-crosslinked polymer adhesive material layer.

[0185] Provide first connecting wires 24 , and arrange a portion of the first connecting wires 24 on the surface of the first fixing layer 31 along the second direction K at intervals. Extend another portion of the first connecting wires 24 onto the fourth fixing layer 34 and arrange the portion along the second direction K at intervals on the surface of the fourth fixing layer 34 .

[0186] A first cell 13 and a third cell 15 are provided. The first cell 13 is placed on the side of the first connecting wire 24 away from the first fixing layer 31, and the third cell 15 is placed on the side of the first connecting wire 24 away from the fourth fixing layer 34. Thus, the first connecting wire 24 is fixed to the surface of the first cell 13 via the first fixing layer 31, and the first connecting wire 24 is fixed to the surface of the third cell 15 via the fourth fixing layer 34, completing the preparation of a back-contact photovoltaic module.

[0187] In an embodiment of the present application, a method for heating the connecting wire 20 of the battery cell 10 so that the connecting wire 20 is fixed to the surface of the battery cell 10 includes: providing a preheating area, the preheating area including a first heating zone and a second heating zone spaced apart, and placing the photovoltaic module between the first heating zone and the second heating zone; wherein the heating temperature of the first heating zone is greater than or equal to 100 degrees and less than or equal to 130 degrees, and the heating temperature of the second heating zone is greater than or equal to 130 degrees and less than or equal to 160 degrees.

[0188] In the embodiment of the present application, during the process of preheating the photovoltaic module, the photovoltaic module can be placed in the preheating area to preheat the photovoltaic module. The preheating area includes a first heating zone and a second heating zone that are spaced apart, the photovoltaic module is placed between the first heating zone and the second heating zone, and the heating temperature of the first heating zone is set to be greater than or equal to 100 degrees and less than or equal to 130 degrees. The heating temperature of the second heating zone is set to be greater than or equal to 130 degrees and less than or equal to 160 degrees. After preheating, the bonding layer 22 on the first connecting wire 24 is partially bonded to the first battery cell 13 to achieve pre-bonding. Furthermore, through preheating, the first base glue layer 31 can be adhered to the surface of the first battery cell 13, so that the first connecting wire 24 can be fixed to the surface of the first battery cell 13.

[0189] For example, the first heating zone can be heated by a bottom plate, and the second heating zone can be heated by an infrared lamp. Of course, in the embodiment of the present application, there is no limitation on the specific heating method of the first heating zone and the second heating zone. In the actual production process, technicians can select an appropriate heating method as needed.

[0190] It should be noted that in the embodiments of the present application, the heating temperature of the first heating zone can be set to 100 degrees, 105 degrees, 110 degrees, 115 degrees, 120 degrees, 125 degrees, 130 degrees, etc. The heating temperature of the second heating zone can be set to 130 degrees, 135 degrees, 140 degrees, 145 degrees, 150 degrees, 155 degrees, 160 degrees, etc. The above are only examples of the heating temperatures of the first heating zone and the second heating zone and are not intended to limit the present application. In actual production processes, technicians can set the heating temperatures of the first heating zone and the second heating zone as needed.

[0191] Optionally, after providing a sealing layer and sealing the heated stacked structure with the sealing layer, the method further comprises: laminating the photovoltaic modules, wherein the lamination temperature is greater than or equal to 100 degrees and less than or equal to 165 degrees.

[0192] In an embodiment of the present application, after providing a sealing layer and sealing the heated stacked structure with the sealing layer, the method further includes laminating photovoltaic modules, and setting the lamination temperature to be greater than or equal to 100 degrees Celsius and less than or equal to 165 degrees Celsius. Specifically, when laminating photovoltaic modules, the lamination temperature can be set to 100 degrees Celsius, 110 degrees Celsius, 120 degrees Celsius, 130 degrees Celsius, 140 degrees Celsius, 150 degrees Celsius, 160 degrees Celsius, 165 degrees Celsius, etc.

[0193] The process of laminating photovoltaic modules mainly involves bonding the cover plate 50 or the back plate 60 to the first fixing layer 31 through the adhesive layer 40, and bonding the cover plate 50 or the back plate 60 to the first battery cell 13 through the adhesive layer 40 and the first fixing layer 31 to fix and protect the first battery cell 13.

[0194] Furthermore, during the photovoltaic module lamination process, the first connecting wire 24 needs to be electrically connected to the first solar cell 13, and the lamination temperature is set to be greater than or equal to 100 degrees Celsius and less than or equal to 165 degrees Celsius. This allows the bonding layer 22 on the surface of the first connecting wire 24 to be melt-bonded to the first solar cell 13, thereby achieving electrical connection between the first connecting wire 24 and the first solar cell 13.

[0195] Optionally, the adhesive layer 40 is an EPE structure, and the EPE structure includes an EVA layer, a POE layer and an EVA layer stacked in sequence.

[0196] In this embodiment of the present application, the adhesive layer 40 is configured as an EPE structure. That is, the adhesive layer 40 includes a pre-crosslinked EVA layer, a pre-crosslinked POE layer, and a pre-crosslinked EVA layer stacked in sequence. The pre-crosslinked EVA layer has advantages such as low fluidity, low cost, and good adhesion.

[0197] Therefore, the cover plate 50 or the back plate 60 is bonded to the first fixing layer 31 through the adhesive layer 40, so that the cover plate 50 or the back plate 60 can be more firmly fixed to the surface of the first battery cell 13. Furthermore, the first connecting wire 24 can also be more firmly fixed to the surface of the first battery cell 13.

[0198] In addition, the POE layer has a good property of resisting the PID effect. By providing the POE layer in the adhesive layer 40 , the resistance of the photovoltaic module to the PID effect can be improved.

[0199] Optionally, the first fixing layer 31 includes an EVA layer, and the EVA layer is disposed on a side of the first fixing layer 31 close to the adhesive layer 40 .

[0200] The first fixing layer 31 in the embodiment of the present application can be a single-layer structure or a multi-layer structure. For example, the first fixing layer 31 can be set as a double-layer structure or a triple-layer structure. In this regard, the embodiment of the present application does not impose too many restrictions. In actual use, technicians can set it as needed.

[0201] Regardless of whether the first fixing layer 31 is a single-layer structure or a multi-layer structure, the first fixing layer 31 includes an EVA layer, and the EVA layer is disposed on a side of the first fixing layer 31 close to the adhesive layer 40. In the embodiment of the present application, the first connecting wire 24 is bonded to the surface of the first battery cell 13 via the EVA layer to improve the reliability of the connection between the first connecting wire 24 and the first battery cell 13.

[0202] Optionally, after the photovoltaic module is formed, the EVA layer of the first fixing layer 31 and the EVA layer of the adhesive layer 40 are integrated.

[0203] In the embodiment of the present application, after the photovoltaic module is formed, the EVA layer of the first fixing layer 31 and the EVA layer of the adhesive layer 40 are integrated into one, thereby ensuring the reliability of the bonding between the first fixing layer 31 and the adhesive layer 40 .

[0204] Optionally, both the first fixing layer 31 and the adhesive layer 40 are single-layer structures, wherein the first fixing layer 31 includes an EVA layer, and the adhesive layer 40 includes a POE layer.

[0205] In the embodiment of the present application, the first fixing layer 31 and the adhesive layer 40 can also be set to a single-layer structure. The first fixing layer 31 of the single-layer structure is an EVA layer, and the adhesive layer 40 of the single-layer structure is a POE layer. The first fixing layer 31 of the EVA material can be better bonded to the surface of the first battery cell 13, thereby fixing the first connecting line 24 to the surface of the first battery cell 13 to avoid the first connecting line 24 from being offset. The adhesive layer 40 of the POE material has a good water-blocking effect and can effectively prevent water vapor from reaching the first battery cell 13. Furthermore, the adhesive layer 40 of the POE material has a good bonding force with the first fixing layer 31 of the EVA material and can be better bonded to the first fixing layer 31, thereby ensuring the reliability of the photovoltaic module.

[0206] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, i.e., they may be located in one location or distributed across multiple network units. Some or all of the modules may be selected based on actual needs to achieve the objectives of the present embodiment. Persons of ordinary skill in the art will be able to understand and implement the present invention without inventive effort.

[0207] References herein to "one embodiment," "an embodiment," or "one or more embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the present application. Furthermore, please note that examples of the phrase "in one embodiment" herein do not necessarily all refer to the same embodiment. In the description provided herein, numerous specific details are described. However, it is understood that embodiments of the present application may be practiced without these specific details. In some instances, well-known methods, structures, and techniques are not shown in detail so as not to obscure the understanding of this description.

[0208] In the claims, any reference signs placed between brackets shall not be construed as limiting the claim. The word "comprising" does not exclude the presence of elements or steps not listed in the claim. The word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements. The present application may be implemented by means of hardware comprising several different elements and by means of a suitably programmed computer. In a unit claim enumerating several means, several of these means may be embodied by one and the same item of hardware. The use of the words first, second, and third etc. does not indicate any order. These words may be interpreted as names.

[0209] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A photovoltaic module, wherein: include: A battery cell, wherein a plurality of fine grid lines arranged at intervals along a first direction are provided on a surface of the battery cell; A connecting wire, the connecting wire is arranged on the surface of the battery cell and intersects the fine grid line, the connecting wire comprises a connecting wire substrate and a bonding layer attached to the surface of the connecting wire substrate; The photovoltaic module has a first area and a second area, the first area and the second area are both located between the connecting wire substrate and the surface of the battery sheet, the projection of the first area on the battery sheet is on the fine grid lines, and the projection of the second area on the battery sheet is between the fine grid lines; A filling ratio of the bonding layer at the first region is greater than a filling ratio of the bonding layer at the second region.

2. The photovoltaic module according to claim 1, wherein: The photovoltaic module also has a first cross section, the first cross section is perpendicular to the surface of the cell, and the first cross section passes through the first area; At the first cross section, the bonding layer includes an arc-shaped structure surrounding a side of the connecting wire substrate away from the battery cell and a rectangular structure surrounding a side of the connecting wire substrate close to the battery cell.

3. The photovoltaic module according to claim 2, wherein: The connection between the rectangular structure and the battery cell has a chamfered structure.

4. The photovoltaic module according to claim 1, wherein: At the first region, the bonding layer completely fills the first region.

5. The photovoltaic module according to claim 1, wherein: At the second region, a first gap exists between at least a portion of the bonding layer and a surface of the battery cell, and the first gap is not filled by the bonding layer.

6. The photovoltaic module according to claim 1, wherein: The photovoltaic assembly further includes: a fixing layer, which is arranged on a side of the connecting wire away from the solar cell, and is used to fix the connecting wire to the surface of the solar cell.

7. The photovoltaic module according to claim 6, wherein: Along a direction perpendicular to the plane where the battery cell is located, the fixed layer has a first projection, and the first projection falls into the battery cell.

8. The photovoltaic module according to claim 1, wherein: The photovoltaic module further includes: a plurality of glue points arranged at intervals along the extension direction of the connecting wire, the glue points are arranged between the connecting wire and the surface of the battery cell, and the glue points are used to fix the connecting wire to the surface of the battery cell.

9. The photovoltaic module according to any one of claims 1 to 8, wherein: The melting point of the bonding layer is less than 165 degrees, and the bonding layer includes at least one of a tin-lead-bismuth layer, a tin-bismuth-silver layer, or a tin-indium layer.

10. The photovoltaic module according to claim 1, wherein: The photovoltaic module also includes: a glue layer and a cover plate or a back plate, The adhesive layer and the cover plate or the back plate are sequentially arranged on a side of the connection line away from the battery cell, so as to connect the cover plate or the back plate to the battery cell through the adhesive layer.

11. The photovoltaic module according to claim 10, wherein: The battery cells include a plurality of battery cells, the plurality of battery cells are arranged at intervals, and a second gap exists between two adjacent battery cells; The glue layer is arranged in the second gap along a direction perpendicular to the plane where the battery sheet is located.

12. The photovoltaic module according to claim 1, wherein: The battery cell includes a battery cell without a main grid line.

13. The photovoltaic module according to claim 6, wherein: The fixing layer is a single-layer structure, and the single-layer structure is an EVA layer.

14. The photovoltaic module according to claim 6, wherein: The fixing layer is a double-layer structure, which includes an EVA layer and a POE layer. The EVA layer is arranged on a side of the fixing layer close to the battery cell, and a portion of the EVA layer is connected to the battery cell.

15. The photovoltaic module according to claim 1, wherein: At least one main grid line is also arranged on the battery cell, and at least one main grid line extends along the first direction; Along a direction perpendicular to the plane where the battery cell is located, a projection of at least one of the main grid lines on the battery cell is staggered with a projection of the connecting line on the battery cell.

16. The photovoltaic module according to claim 15, wherein: Along a second direction perpendicular to the first direction, the battery cell has a first side surface and a second side surface that are oppositely disposed; The busbars include two busbars, one busbar is disposed in a region of the surface of the cell close to the first side surface, and the other busbar is disposed in a region of the surface of the cell close to the second side surface.

17. A method for preparing a photovoltaic module, wherein: The method comprises the following steps: (1) a connecting wire is arranged on at least one surface of a battery cell; the surface of the battery cell is provided with a plurality of fine grid lines arranged at intervals along a first direction, the connecting wires intersect the fine grid lines, and the connecting wires include a connecting wire substrate and a bonding layer attached to the surface of the connecting wire substrate; (2) heating the battery cell and the connecting wire so that the connecting wire is fixed to the surface of the battery cell; (3) providing a sealing layer, and sealing the heated battery cell through the sealing layer; The photovoltaic module has a first area and a second area, the first area and the second area are both located between the connecting wire substrate and the surface of the battery sheet, the projection of the first area on the battery sheet is on the fine grid lines, and the projection of the second area on the battery sheet is between the fine grid lines; A filling ratio of the bonding layer at the first region is greater than a filling ratio of the bonding layer at the second region.

18. The method for preparing a photovoltaic module according to claim 17, wherein: After providing a connection line on at least one surface of the battery cell, the method further comprises: A fixing layer is arranged on a side of the connecting line away from the battery sheet to form a stacked structure; The method of heating the battery cell and the connecting wire to fix the connecting wire to the surface of the battery cell further includes: heating the stacked structure to fix the connecting wire to the surface of the battery cell through the fixing layer.

19. The method for preparing a photovoltaic module according to claim 17, wherein: The method of providing a connecting line on at least one surface of a battery cell comprises: A plurality of glue spots are arranged at intervals on the surface of the battery sheet along the extending direction of the connecting line, and the connecting line is laid on a side of the plurality of glue spots away from the battery sheet.

20. The method for preparing a photovoltaic module according to claim 17, wherein: The sealing layer includes a glue layer and a cover plate or a back plate, the glue layer is at least partially bonded to the battery cell, and the cover plate or the back plate is arranged on a side of the glue layer away from the battery cell.

21. The method for preparing a photovoltaic module according to claim 18, wherein: The stacked structure sequentially arranges the connection line and the fixing layer on one surface of the battery cell, and sequentially arranges another connection line and another fixing layer on the other surface of the battery cell, and two adjacent battery cells are connected by the same connection line.

22. The method for preparing a photovoltaic module according to claim 18, wherein: The method of providing a connection line on at least one surface of a battery cell and providing a fixing layer on a side of the connection line away from the battery cell to form a stacked structure further includes: providing a first fixing layer; Providing a first connecting wire, and laying the first connecting wire on the surface of the first fixing layer; Providing a battery cell, and laying the battery cell on a side of the first connecting line away from the first fixing layer; Providing a second connecting line, laying the second connecting line on the surface of the battery cell away from the first connecting line, Providing a third fixing layer, and laying the third fixing layer on the surface of the second connecting line away from the battery sheet; A portion of the first connection line is laid on a surface of the adjacent battery cell close to the third fixing layer, and another portion of the first connection line extends to the first fixing layer and is laid on a surface of the first fixing layer.

23. The method for preparing a photovoltaic module according to claim 18, wherein: The stacked structure is provided with the connection wire and the fixing layer only on one surface of the battery cell, and the connection wire and the fixing layer are not provided on the other surface of the battery cell.

24. The method for preparing a photovoltaic module according to claim 23, wherein: The method of providing a connection line on at least one surface of a battery cell and providing a fixing layer on a side of the connection line away from the battery cell to form a stacked structure further includes: Providing at least two fixed layers, and arranging the at least two fixed layers at intervals; Providing a connecting line, laying a portion of the connecting line on one of the fixing layers, and extending another portion of the connecting line to an adjacent fixing layer and laying it on the adjacent fixing layer; At least two battery cells are provided, and the battery cells are stacked on a side of the connection line away from the fixing layer, so that each of the battery cells is arranged corresponding to one of the fixing layers.

25. The method for preparing a photovoltaic module according to claim 17, wherein: After providing the sealing layer and sealing the heated battery cell with the sealing layer, the method further includes: The photovoltaic module is laminated at a lamination temperature greater than or equal to 100 degrees and less than or equal to 165 degrees.

26. A photovoltaic module, wherein: include: A battery cell, wherein a first surface of the battery cell is provided with a plurality of first fine grid lines arranged at intervals along a first direction, and a second surface of the battery cell is provided with a plurality of second fine grid lines arranged at intervals along the first direction; A third connecting line and a fourth connecting line, wherein the third connecting line is disposed on the first surface of the battery cell and intersects the first fine grid line, and the fourth connecting line is disposed on the second surface of the battery cell and intersects the second fine grid line, and each of the third connecting line and the fourth connecting line comprises a connecting line substrate and a bonding layer attached to a surface of the connecting line substrate; A filling ratio of the bonding layer between the bonding wire base of the third bonding wire and the first surface is greater than a filling ratio of the bonding layer between the bonding wire base of the fourth bonding wire and the second surface.

27. The photovoltaic assembly according to claim 26, wherein: The first surface is the light-receiving surface of the cell.

28. The photovoltaic assembly according to claim 26, wherein: The number of the first thin gate lines on the first surface is less than the number of the second thin gate lines on the second surface.

29. The photovoltaic assembly according to claim 26, wherein: The photovoltaic module has a first area and a second area, the first area and the second area are both located between the connecting wire substrate of the fourth connecting wire and the second surface, the projection of the first area on the battery sheet is on the second fine grid lines, and the projection of the second area on the battery sheet is between the second fine grid lines; A filling ratio of the bonding layer at the first region is greater than a filling ratio of the bonding layer at the second region.

30. The photovoltaic assembly according to claim 26, wherein: The cross-section of the connecting wire base of the third connecting wire and the cross-section of the connecting wire base of the fourth connecting wire are both circular, and the diameters of the circles are the same.

31. The photovoltaic assembly according to claim 26, wherein: A filling amount of the bonding layer between the third connection line and the first surface is greater than a filling amount of the bonding layer between the fourth connection line and the second surface.

32. The photovoltaic assembly according to any one of claims 26 to 31, wherein: The battery cell includes a heterojunction battery cell.

33. The photovoltaic assembly according to any one of claims 26 to 31, wherein: The cell further comprises a transparent conductive layer, and the transparent conductive layer is arranged on the first surface and the second surface; The third connection line and / or the fourth connection line is electrically connected to the transparent conductive layer through the bonding layer.

34. The photovoltaic assembly according to any one of claims 26 to 31, wherein: The battery cell includes a battery cell without a main grid.

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