Photovoltaic module

Abstract

This disclosure relates to the photovoltaic field and provides a photovoltaic module. The photovoltaic module includes multiple solar cells and solder ribbons. Multiple grid lines and solder joints electrically contacting the corresponding grid lines are disposed on the second surface of each solar cell. The multiple solar cells include first and second solar cells arranged adjacent to each other. The second surfaces of the first and second solar cells face the same direction, and the second edge region of the first solar cell is adjacent to the second solar cell, while the first edge region of the second solar cell is adjacent to the first solar cell. For the same solder ribbon, the contact area between at least one solder joint on the second edge region of the first solar cell and the solder ribbon is larger than the contact area between the solder joint on the middle region of the first solar cell and the solder ribbon, and the contact area between at least one solder joint on the first edge region of the second solar cell and the solder ribbon is larger than the contact area between the solder joint on the middle region of the second solar cell and the solder ribbon. This disclosure embodiment can at least improve the performance of the photovoltaic module.

Description

Technical Field

[0001] This disclosure relates to the photovoltaic field, and in particular to a photovoltaic module. Background Technology

[0002] With global energy consumption rapidly increasing and traditional fossil fuels becoming increasingly depleted, energy and environmental issues have gradually become two major global concerns. Driven by pressure to address environmental pollution and promote sustainable development, researchers have prioritized the solar photovoltaic industry in the development and utilization of renewable energy.

[0003] Photovoltaic modules are crucial devices for converting solar energy into electrical energy. A photovoltaic module consists of multiple solar cells and solder ribbons. The solar cells have solder joints, and the solder ribbons connect adjacent solar cells. However, currently, there is a risk of incomplete soldering between the solder ribbons and solder joints in some areas of the solar cells, which adversely affects the performance of the photovoltaic module, thus requiring improvement in its performance. Utility Model Content

[0004] This disclosure provides a photovoltaic module that can at least improve the performance of the photovoltaic module.

[0005] According to some embodiments of this disclosure, a photovoltaic module is provided. The photovoltaic module includes: a plurality of solar cells, each solar cell including a first surface and a second surface facing each other. The second surface is provided with a plurality of grid lines and welding portions electrically contacting the corresponding grid lines. The second surface includes a first edge region and a second edge region spaced apart in a first direction, and an intermediate region located between the first edge region and the second edge region. The plurality of solar cells includes first solar cells and second solar cells arranged adjacent to each other. The second surface of the first solar cell and the second surface of the second solar cell face the same direction, and the second edge region of the first solar cell is adjacent to the second solar cell. The first edge region of the two battery cells is adjacent to the first battery cell; the solder strip is electrically in contact with a welding portion on the second surface of the first battery cell and also electrically in contact with the welding portion on the second surface of the second battery cell; wherein, for the same solder strip, the contact area between at least one welding portion on the second edge region of the first battery cell and the solder strip is greater than the contact area between the welding portion on the middle region of the first battery cell and the solder strip, and the contact area between at least one welding portion on the first edge region of the second battery cell and the solder strip is greater than the contact area between the welding portion on the middle region of the second battery cell and the solder strip.

[0006] In some embodiments, the solder strip includes: a first widening portion electrically connected to at least one of the weld portions on the second edge region of the first battery cell, and / or the first widening portion electrically contacting at least one of the weld portions on the first edge region of the second battery cell; a first extension portion connected to the first widening portion and extending along the first direction; wherein the width of the first widening portion along the second direction is greater than the width of the first extension portion along the second direction.

[0007] In some embodiments, the thickness of the first widened portion is less than the thickness of the first extended portion.

[0008] In some embodiments, the width of the first widened portion along the second direction is 0.4 mm to 0.8 mm, and the width of the first extended portion along the second direction is 0.20 mm to 0.28 mm.

[0009] In some embodiments, the first widening portion is electrically connected to at least one of the welded portions on the second edge region of the first battery cell, and the first widening portion is electrically in contact with at least one of the welded portions on the first edge region of the second battery cell. The orthographic projection area of ​​the welded portion on the second edge region of the first battery cell on the second surface is equal to the orthographic projection area of ​​the welded portion on the middle region of the first battery cell on the second surface, and the orthographic projection area of ​​the welded portion on the first edge region of the second battery cell on the second surface is equal to the orthographic projection area of ​​the welded portion on the middle region of the second battery cell on the second surface.

[0010] In some embodiments, for the same solder strip, at least one of the welded portions located on the second edge region of the first battery cell is a first welded portion, and the welded portion located on the middle region of the first battery cell is a second welded portion, wherein the orthographic projection area of ​​the first welded portion on the second surface is greater than the orthographic projection area of ​​the second welded portion on the second surface; and / or, for the same solder strip, at least one of the welded portions located on the first edge region of the second battery cell is a third welded portion, and the welded portion located on the middle region of the second battery cell is a fourth welded portion, wherein the orthographic projection area of ​​the third welded portion on the second surface is greater than the orthographic projection area of ​​the fourth welded portion on the second surface.

[0011] In some embodiments, the orthographic projection area of ​​the first welded portion on the second surface is 0.675 mm. 2 ~1.44mm 2 The projected area of ​​the second welded part on the second surface is 0.18 mm. 2 ~0.6mm 2The projected area of ​​the third welded portion on the second surface is 0.675 mm². 2 ~1.44mm 2 The projected area of ​​the fourth welded part on the second surface is 0.18 mm. 2 ~0.6mm 2 .

[0012] In some embodiments, the first welding portion includes: a first main body portion and a first gradient portion, the first gradient portion being connected to the first main body portion and located on the side of the first main body portion away from the second battery cell, and the width of the first gradient portion gradually decreasing along the second direction in the direction from the second battery cell to the first battery cell; and / or, the third welding portion includes: a second main body portion and a second gradient portion, the second gradient portion being connected to the second main body portion and located on the side of the second main body portion away from the first battery cell, and the width of the first gradient portion gradually decreasing along the second direction in the direction from the first battery cell to the second battery cell.

[0013] In some embodiments, the first gradient portion includes a first contour line and a second contour line. In the direction from the second battery cell to the first battery cell, the distance between the first contour line and the second contour line along the second direction gradually decreases. The first contour line is an arc, and the second contour line is an arc. In the direction from the second battery cell to the first battery cell, the absolute value of the slope of the first contour line gradually decreases, and the absolute value of the slope of the second contour line gradually decreases. And / or, the second gradient portion includes a third contour line and a fourth contour line. In the direction from the first battery cell to the second battery cell, the distance between the third contour line and the fourth contour line along the second direction gradually decreases. The third contour line is an arc, and the fourth contour line is an arc. In the direction from the first battery cell to the second battery cell, the absolute value of the slope of the third contour line gradually decreases, and the absolute value of the slope of the fourth contour line gradually decreases.

[0014] In some embodiments, the width of the first main body portion along the first direction is 0.6mm to 0.8mm, the length of the first main body portion along the second direction is 1mm to 1.2mm, the width of the first gradient portion along the first direction is 0.3mm to 0.8mm, and the length of the end of the first gradient portion near the first main body portion along the second direction is 1mm to 1.2mm; the width of the second main body portion along the first direction is 0.6mm to 0.8mm, the length of the second main body portion along the second direction is 1mm to 1.2mm, the width of the second gradient portion along the first direction is 0.3mm to 0.8mm, and the length of the end of the second gradient portion near the second main body portion along the second direction is 1mm to 1.2mm.

[0015] In some embodiments, for the same solder strip, the contact area between the solder portion adjacent to the second battery cell on the second edge region of the first battery cell and the solder strip is greater than the contact area between the solder portion on the middle region and the solder strip; the contact area between the solder portion adjacent to the first battery cell on the first edge region of the second battery cell and the solder strip is greater than the contact area between the solder portion on the middle region and the solder strip.

[0016] In some embodiments, for the same solder strip, the number of welded portions on the first edge region of the second battery cell is less than or equal to 3, and the number of welded portions on the second edge region of the first battery cell is less than or equal to 3; and / or, in the first direction, the ratio of the width of the first edge region to the width of the second battery cell is less than or equal to 1 / 4, and the ratio of the width of the second edge region to the width of the first battery cell is less than or equal to 1 / 4.

[0017] In some embodiments, for the same solder strip, the contact area between at least one of the welded portions on the first edge region of the first battery cell and the solder strip is greater than the contact area between the welded portion on the middle region of the first battery cell and the solder strip, and the contact area between at least one of the welded portions on the second edge region of the second battery cell and the solder strip is greater than the contact area between the welded portion on the middle region of the second battery cell and the solder strip.

[0018] In some embodiments, the solder strip includes: a second widening portion electrically connected to at least one of the weld portions on the first edge region of the first battery cell, and / or, the second widening portion electrically contacting at least one of the weld portions on the second edge region of the second battery cell; a first extension portion connected to the second widening portion and extending along a first direction; wherein the width of the second widening portion along a second direction is greater than the width of the first extension portion along the second direction.

[0019] In some embodiments, for the same solder strip, at least one of the welded portions located on the first edge region of the first battery cell is a fifth welded portion, and the welded portion located on the middle region of the first battery cell is a second welded portion, wherein the orthographic projection area of ​​the fifth welded portion on the second surface is greater than the orthographic projection area of ​​the second welded portion on the second surface; and / or, for the same solder strip, at least one of the welded portions located on the second edge region of the second battery cell is a sixth welded portion, and the welded portion located on the middle region of the second battery cell is a fourth welded portion, wherein the orthographic projection area of ​​the sixth welded portion on the second surface is greater than the orthographic projection area of ​​the fourth welded portion on the second surface.

[0020] The technical solutions provided in this disclosure have at least the following advantages:

[0021] In the photovoltaic module technical solution provided in this disclosure, for the same solder strip, the contact area between at least one solder part on the second edge region of the first cell and the solder strip is greater than the contact area between the solder part on the middle region of the first cell and the solder strip. That is, the contact area between at least one solder part on the second edge region of the first cell and the solder strip is larger, which is beneficial to improve the connection strength between at least one solder part on the second edge region of the first cell and the solder strip, reduce the risk of poor soldering between the solder part on the second edge region of the first cell and the solder strip, and thus improve the performance of the photovoltaic module.

[0022] Furthermore, for the same solder strip, the contact area between at least one solder joint on the first edge region of the second cell and the solder strip is larger than the contact area between the solder joint on the middle region of the second cell and the solder strip. In other words, the contact area between at least one solder joint on the first edge region of the second cell and the solder strip is larger, which is beneficial to improving the connection strength between at least one solder joint on the first edge region of the second cell and the solder strip, thereby reducing the risk of poor soldering between the solder joint on the first edge region of the second cell and the solder strip, and thus improving the performance of the photovoltaic module. Attached Figure Description

[0023] One or more embodiments are illustrated by way of example with corresponding pictures in the accompanying drawings. These illustrations do not constitute a limitation on the embodiments. Unless otherwise stated, the pictures in the accompanying drawings do not constitute a limitation on scale. In order to more clearly illustrate the technical solutions in the embodiments of this disclosure or in the conventional art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this disclosure. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of a partial structure of a photovoltaic module in related technologies;

[0025] Figure 2 This is a partial top view of a photovoltaic module in related technologies;

[0026] Figure 3 This is a schematic diagram of a first partial structure of a photovoltaic module provided in an embodiment of the present disclosure;

[0027] Figure 4 This is a first partial top view of a photovoltaic module provided in an embodiment of this disclosure;

[0028] Figure 5 Another partial top view schematic diagram of a photovoltaic module provided in an embodiment of this disclosure;

[0029] Figure 6 A schematic diagram of the structure of the first welded part provided in an embodiment of this disclosure;

[0030] Figure 7 A schematic diagram of the structure of the third welding part provided in an embodiment of this disclosure;

[0031] Figure 8 This is another structural schematic diagram of the first welded part provided in an embodiment of the present disclosure;

[0032] Figure 9 This is another structural schematic diagram of the third welded part provided in an embodiment of the present disclosure;

[0033] Figure 10 This is a schematic diagram of a second partial structure of a photovoltaic module provided in an embodiment of this disclosure;

[0034] Figure 11 This is a second partial top view of a photovoltaic module provided in an embodiment of this disclosure;

[0035] Figure 12 This is a schematic diagram of a third partial structure of a photovoltaic module provided in an embodiment of this disclosure;

[0036] Figure 13This is a third partial top view of a photovoltaic module provided in an embodiment of this disclosure;

[0037] Figure 14 This is a schematic diagram of a fourth partial structure of a photovoltaic module provided in an embodiment of this disclosure;

[0038] Figure 15 This is a fourth partial top view of a photovoltaic module provided in an embodiment of this disclosure;

[0039] Figure 16 A schematic diagram of a fifth partial structure of a photovoltaic module provided in an embodiment of this disclosure;

[0040] Figure 17 A fifth partial top view of a photovoltaic module provided in an embodiment of this disclosure;

[0041] Figure 18 A schematic diagram of the structure of the fifth welding part provided in an embodiment of this disclosure;

[0042] Figure 19 This is a schematic diagram of a sixth welding part provided in an embodiment of the present disclosure. Detailed Implementation

[0043] Figure 1 This is a schematic diagram of a partial structure of a photovoltaic module in related technologies. Figure 2 This is a partial top view of a photovoltaic module in related technologies.

[0044] refer to Figure 1 and Figure 2 The photovoltaic module includes multiple solar cells 10. Each solar cell 10 includes a first surface 11 and a second surface 12 facing each other. The second surface 12 is provided with multiple grid lines (not shown) and welding portions 13 that are electrically in contact with the corresponding grid lines. The second surface 12 includes a first edge region and a second edge region arranged at intervals in a first direction, and an intermediate region located between the first edge region and the second edge region. The multiple solar cells 10 include a first solar cell 10a and a second solar cell 10b arranged adjacent to each other. The second surface 12 of the first solar cell 10a and the second surface 12 of the second solar cell 10b face the same direction, and the second edge region of the first solar cell 10a is adjacent to the second solar cell 10b, and the first edge region of the second solar cell 10b is adjacent to the first solar cell 10a. The photovoltaic module also includes a solder ribbon 14, which is electrically in contact with the welding portions 13 on the second surface 12 of the first solar cell 10a and also electrically in contact with the welding portions 13 on the second surface 12 of the second solar cell 10b.

[0045] Among them, the welding part 13 on the second edge region of the first solar cell 10a and the first edge region of the second solar cell 10b is prone to poor welding with the solder strip 14 due to stress concentration, which reduces the performance of the photovoltaic module.

[0046] Therefore, the performance of photovoltaic modules in related technologies needs to be improved.

[0047] This disclosure provides a photovoltaic module in which at least one welded part on the second edge region of the first cell has a large contact area with the solder strip, which is beneficial to improving the connection strength between the at least one welded part on the second edge region of the first cell and the solder strip, reducing the risk of poor soldering between the welded part on the second edge region of the first cell and the solder strip, thereby improving the performance of the photovoltaic module.

[0048] The larger contact area between at least one welded part on the first edge region of the second cell and the solder strip is beneficial to improving the connection strength between at least one welded part on the first edge region of the second cell and the solder strip, thereby reducing the risk of poor soldering between the welded part on the first edge region of the second cell and the solder strip, and thus improving the performance of the photovoltaic module.

[0049] In the description of the embodiments of this disclosure, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary or secondary relationship of the indicated technical features. In the description of the embodiments of this disclosure, "a plurality of" means two or more, unless otherwise explicitly defined.

[0050] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this disclosure. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0051] In the description of the embodiments of this disclosure, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent three cases: A exists, A and B exist simultaneously, and B exists. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0052] In the description of the embodiments of this disclosure, the technical terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this disclosure and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this disclosure.

[0053] In the accompanying drawings corresponding to the embodiments of this disclosure, the thickness and area of ​​the layers are enlarged for better understanding and ease of description. When describing a component (such as a layer, film, region, or substrate) on or on the surface of another component, the component may be "directly" located on the surface of the other component, or there may be a third component between the two components. Conversely, when describing a component on the surface of another component, or when another component is formed or disposed on the surface of a component, it indicates that there is no third component between the two components. Furthermore, when describing a component as being "generally" formed on another component, it means that the component is not formed on the entire surface (or front surface) of the other component, nor is it formed on a portion of the edge of the entire surface.

[0054] In the description of embodiments of this disclosure, when a component "includes" another component, other components are not excluded unless otherwise stated, and may be further included. Furthermore, when a component such as a layer, film, region, or plate is referred to as being "on / located" on another component, it can be "directly on" the other component (i.e., located on the surface of the other component with no other components between them), or another component may be present therein. Additionally, when a component such as a layer, film, region, or plate is "directly located" on another component, or when a component such as a layer, film, region, or plate is located on the surface of another component, it indicates that no other components are located therein.

[0055] The embodiments of this disclosure will now be described in detail with reference to the accompanying drawings. However, those skilled in the art will understand that many technical details have been provided in the embodiments of this disclosure to facilitate a better understanding of the disclosure. However, the technical solutions claimed in this disclosure can be implemented even without these technical details and various variations and modifications based on the following embodiments.

[0056] Figure 3 This is a schematic diagram of a first partial structure of a photovoltaic module provided in an embodiment of this disclosure. Figure 4 This is a first partial top view of a photovoltaic module provided in an embodiment of this disclosure.

[0057] refer to Figure 3 and Figure 4The photovoltaic module includes: a plurality of solar cells 20, each solar cell 20 having a first surface 21 and a second surface 22 facing each other. The second surface 22 is provided with a plurality of grid lines and welding portions 23 electrically contacting the corresponding grid lines. The second surface 22 includes a first edge region 221 and a second edge region 222 arranged at intervals in a first direction X, and an intermediate region 223 located between the first edge region 221 and the second edge region 222. The plurality of solar cells 20 includes a first solar cell 20a and a second solar cell 20b arranged adjacent to each other. The second surface 22 of the first solar cell 20a and the second surface 22 of the second solar cell 20b face the same direction, and the second edge region 222 of the first solar cell 20a is adjacent to the second solar cell 20b, and the first edge region 221 of the second solar cell 20b is adjacent to the first solar cell 20a. The photovoltaic module also includes a solder ribbon 24, which makes electrical contact with a welding portion 23 on the second surface 22 of the first cell 20a and also makes electrical contact with a welding portion 23 on the second surface 22 of the second cell 20b. Specifically, for the same solder ribbon 24, the contact area between at least one welding portion 23 on the second edge region 222 of the first cell 20a and the solder ribbon 24 is larger than the contact area between the welding portion 23 on the middle region 223 of the first cell 20a and the solder ribbon 24, and the contact area between at least one welding portion 23 on the first edge region 221 of the second cell 20b and the solder ribbon 24 is larger than the contact area between the welding portion 23 on the middle region 223 of the second cell 20b and the solder ribbon 24.

[0058] Photovoltaic modules are used to convert solar energy into electrical energy.

[0059] In some embodiments, the solar cell 20 can be an IBC (Interdigitated Back Contact) cell, an HPBC (Hybrid Passivated Back Contact) cell, a TBC cell that combines TOPCon (Tunnel Oxide Passivated Contact) technology and IBC technology, or an HBC cell that combines HIT / HJT (Heterojunction Technology) technology and IBC technology. Of course, it can also be other types of back contact cells.

[0060] The solar cell 20 can be a main grid cell, which shortens the current conduction path and reduces internal losses, thereby increasing the power of the photovoltaic module. The solar cell 20 can also be a gridless cell, in which case the solder ribbon 24 is used to replace the original main grid and is directly connected to the fine grid, which can significantly reduce the consumption of silver paste and thus reduce the cost of the photovoltaic module.

[0061] Figure 5This is another partial top view of a photovoltaic module provided in an embodiment of this disclosure.

[0062] Reference Figures 3 to 5 The multiple solar cells 20 include first solar cells 20a and second solar cells 20b arranged adjacent to each other. It is understood that the first solar cells 20a and second solar cells 20b are used only to illustrate the positional relationship between adjacent solar cells 20 and the solder strip 24; a solar cell 20 can be either a first solar cell 20a or a second solar cell 20b. Specifically, refer to... Figure 5 The plurality of solar cells 20 may include solar cell 20A, solar cell 20B, and solar cell 20C. Solder ribbon 24A electrically connects solar cell 20A and solar cell 20B, and solder ribbon 24B electrically connects solar cell 20B and solar cell 20C. For solder ribbon 24A, solar cell 20A is the first solar cell 20a, and solar cell 20B is the second solar cell 20b. For solder ribbon 24B, solar cell 20B is the first solar cell 20a, and solar cell 20C is the second solar cell 20b. That is, solar cell 20B can be either the first solar cell 20a or the second solar cell 20b. Solder ribbon 24A is electrically connected to one of the positive and negative grid lines in solar cell 20B, and solder ribbon 24B is electrically connected to the other of the positive and negative grid lines in solar cell 20B.

[0063] The battery cell 20 has a first side 21 and a second side 22 facing each other. In some embodiments, the battery cell 20 is a single-sided battery, in which case the first side 21 can serve as a light-receiving surface for receiving incident light, and the second side 22 serves as a backlight surface. In some embodiments, the battery cell 20 is a double-sided battery, in which case both the first side 21 and the second side 22 can serve as light-receiving surfaces and can both be used to receive incident light.

[0064] The second surface 22 includes a first edge region 221 and a second edge region 222 spaced apart in the first direction X, and an intermediate region 223 located between the first edge region 221 and the second edge region 222. At least one welded portion 23 is provided on the first edge region 221, at least one welded portion 23 is provided on the second edge region 222, and at least one welded portion 23 is provided on the intermediate region 223. It is understood that the first edge region 221, the intermediate region 223, and the second edge region 222 are artificially defined.

[0065] In some embodiments, for the same solder strip 24, the number of solder portions 23 on the first edge region 221 of the second battery cell 20b is less than or equal to 3, and the number of solder portions 23 on the second edge region 222 of the first battery cell 20a is less than or equal to 3; and / or, in the first direction X, the ratio of the width of the first edge region 221 to the width of the second battery cell 20b is less than or equal to 1 / 4, and the ratio of the width of the second edge region 222 to the width of the first battery cell 20a is less than or equal to 1 / 4.

[0066] At least one welding portion 23 is provided on the second edge region 222 of the first battery cell 20a, and at least one welding portion 23 is provided on the first edge region 221 of the second battery cell 20b.

[0067] The grid lines are used to collect and transmit the current generated by the solar cell 20.

[0068] The grid lines include positive grid lines and negative grid lines. The positive grid lines and negative grid lines are alternately distributed on the second surface 22.

[0069] The grid line material can be one or more of aluminum, silver, gold, nickel, molybdenum, or copper.

[0070] Welding section 23 is used for welding grid lines and welding strips 24.

[0071] The material of the welded part 23 can be one or more of aluminum, silver, gold, nickel, molybdenum or copper.

[0072] The solder strip 24 connects adjacent battery cells 20 by means of the soldering portion 23 connecting the second side 22 of the first battery cell 20a and the soldering portion 23 connecting the second side 22 of the second battery cell 20b, so as to form a battery string.

[0073] It is understandable that, for the same solder strip 24, when the second edge region 222 of the first solar cell 20a has multiple solder parts 23, if the contact area between only one solder part 23 on the second edge region 222 of the first solar cell 20a and the solder strip 24 is larger than the contact area between the solder part 23 on the middle region 223 of the first solar cell 20a and the solder strip 24, the contact area between only one solder part 23 on the second edge region 222 of the first solar cell 20a and the solder strip 24 is larger. The connection strength between this solder part 23 and the solder strip 24 is greater. The solder part 23 with greater connection strength can bear greater stress and disperse the stress of other solder parts 23 on the second edge region 222 of the first solar cell 20a. This can reduce the risk of poor soldering between the solder parts 23 and the solder strip 24 on the second edge region 222 of the entire first solar cell 20a and improve the performance of the photovoltaic module. In other words, even if the contact area between only one welded part 23 and the solder strip 24 on the second edge region 222 of the first solar cell 20a is larger than the contact area between the welded part 23 and the solder strip 24 on the middle region 223 of the first solar cell 20a, the performance of the photovoltaic module can still be improved.

[0074] Similarly, for the same solder strip 24, when the first edge region 221 of the second cell 20b has multiple solder parts 23, and the contact area between only one solder part 23 on the first edge region 221 of the second cell 20b and the solder strip 24 is larger than the contact area between the solder part 23 on the middle region 223 of the second cell 20b and the solder strip 24, the contact area between only one solder part 23 on the first edge region 221 of the second cell 20b and the solder strip 24 is larger. The connection strength between this solder part 23 and the solder strip 24 is greater. The solder part 23 with greater connection strength can bear greater stress and disperse the stress of other solder parts 23 on the first edge region 221 of the second cell 20b. This can reduce the risk of poor soldering between the solder parts 23 and the solder strip 24 on the first edge region 221 of the entire second cell 20b and improve the performance of the photovoltaic module. In other words, even if the contact area between only one welded part 23 and the solder strip 24 on the first edge region 221 of the second cell 20b is larger than the contact area between the welded part 23 and the solder strip 24 on the middle region 223 of the second cell 20b, the performance of the photovoltaic module can still be improved.

[0075] In some embodiments, the solder strip 24 includes a first widening portion 241 and a first extension portion 242. The first widening portion 241 is electrically connected to at least one welding portion 23 on the second edge region 222 of the first battery cell 20a, and the first widening portion 241 is electrically in contact with at least one welding portion 23 on the first edge region 221 of the second battery cell 20b. The first extension portion 242 is connected to the first widening portion 241 and extends along a first direction X. The width of the first widening portion 241 along the second direction Y is greater than the width of the first extension portion 242 along the second direction Y.

[0076] The first extension 242 is connected to the first widening portion 241, located in the middle region 223 between the first solar cell 20a and the second solar cell 20b, and makes electrical contact with the welding portion 23 on the middle region 223. The width of the first widening portion 241 along the second direction Y is greater than the width of the first extension 242 along the second direction Y, that is, the width of the first widening portion 241 is larger. The larger width of the first widening portion 241 can increase the contact area between the welding portion 23 and the solder ribbon 24 on the first edge region 221 of the second solar cell 20b and the second edge region 222 of the first solar cell 20a, reducing the risk of poor soldering between the welding portion 23 and the solder ribbon 24 on the first edge region 221 of the second solar cell 20b and the second edge region 222 of the first solar cell 20a, thereby improving the performance of the photovoltaic module. In addition, the smaller width of the first extension 242 can reduce the shading area of ​​the first extension 242 on the solar cell 20, which is also beneficial to improving the performance of the photovoltaic module.

[0077] In some embodiments, the thickness of the first widened portion 241 is less than the thickness of the first extended portion 242. The larger width of the first widened portion 241 can be achieved by reducing the thickness of the first widened portion 241, thus providing an initial solder strip with the same thickness in all parts. Then, the corresponding area of ​​the first widened portion 241 is flattened to reduce the thickness of the first widened portion 241, thereby increasing the thickness of the first widened portion 241 along the second direction Y. This simplifies the fabrication process of the solder strip 24 and is beneficial for improving the efficiency of the photovoltaic module.

[0078] In some embodiments, the thickness of the first widened portion 241 is 0.06 mm to 0.13 mm, for example 0.06 mm, 0.08 mm, 0.1 mm, 0.12 mm or 0.13 mm, and the thickness of the first extended portion 242 is 0.2 mm to 0.28 mm, for example 0.2 mm, 0.1 mm, 0.26 mm or 0.28 mm.

[0079] In some embodiments, the width of the first widened portion 241 along the second direction Y is 0.4mm to 0.8mm, for example, 0.4mm, 0.5mm, 0.6mm, 0.7mm, or 0.8mm. When the width of the first widened portion 241 along the second direction Y is within the aforementioned range, it provides sufficient connection strength with the welded portion 23, thereby reducing the risk of incomplete soldering between the welded portion 23 and the solder strip 24 on the second edge region 222 of the first solar cell 20a and the first edge region 221 of the second solar cell 20b. It also prevents the solar cell 20 from being affected by excessively wide first widened portion 241.

[0080] The width of the first extension 242 along the second direction Y is 0.20 mm to 0.28 mm, for example, 0.2 mm, 0.22 mm, 0.24 mm, 0.26 mm, or 0.28 mm. Since the width of the first extension 242 along the second direction Y is within the above range, a smaller width of the first extension 242 can reduce the shading area of ​​the first extension 242 on the solar cell 20, thereby improving the performance of the photovoltaic module.

[0081] In some embodiments, for the same solder strip 24, at least one solder portion 23 located on the second edge region 222 of the first solar cell 20a is a first solder portion 231, and a solder portion 23 located on the middle region 223 of the first solar cell 20a is a second solder portion 232. The projected area of ​​the first solder portion 231 on the second surface 22 is larger than the projected area of ​​the second solder portion 232 on the second surface 22. The larger projected area of ​​the first solder portion 231 on the second surface 22 can increase the contact area between the first solder portion 231 and the solder strip 24, improve the connection strength between the first solder portion 231 and the solder strip 24, and help reduce the risk of poor soldering between the solder portion 23 and the solder strip 24 in the first edge region 221, thereby improving the performance of the photovoltaic module. Furthermore, the smaller projected area of ​​the second solder portion 232 on the second surface 22 helps reduce the shading area of ​​the second solder portion 232 on the second surface 22, thereby helping to improve the performance of the photovoltaic module.

[0082] For the same solder strip 24, at least one solder portion 23 located on the first edge region 221 of the second cell 20b is a third solder portion 233, and the solder portion 23 located on the middle region 223 of the second cell 20b is a fourth solder portion 234. The projected area of ​​the third solder portion 233 on the second surface 22 is larger than that of the fourth solder portion 234 on the second surface 22. The larger projected area of ​​the third solder portion 233 on the second surface 22 increases the contact area between the third solder portion 233 and the solder strip 24, improves the connection strength between the third solder portion 233 and the solder strip 24, and helps reduce the risk of poor soldering between the solder portion 23 and the solder strip 24 in the second edge region 222, thereby improving the performance of the photovoltaic module. Furthermore, the smaller projected area of ​​the fourth solder portion 234 on the second surface 22 helps reduce the shading area of ​​the fourth solder portion 234 on the second surface 22, thereby helping to improve the performance of the photovoltaic module.

[0083] In some embodiments, the projected area of ​​the first welded portion 231 on the second surface 22 is 0.675 mm. 2 ~1.44mm 2 For example, 0.675mm 2 0.7mm 2 0.9mm 2 1.1mm 2 1.3mm2 Or 1.44mm 2 The projected area of ​​the first weld portion 231 on the second surface 22 is within the aforementioned range. The larger projected area of ​​the first weld portion 231 on the second surface 22 can increase the contact area between the first weld portion 231 and the solder strip 24, improve the connection strength between the first weld portion 231 and the solder strip 24, and help reduce the risk of poor soldering between the weld portion 23 and the solder strip 24 in the first edge area 221, thereby improving the performance of the photovoltaic module.

[0084] The projected area of ​​the second welded part 232 on the second surface 22 is 0.18 mm². 2 ~0.6mm 2 For example, 0.18mm 2 0.2mm 2 0.3mm 2 0.4mm 2 0.5mm 2 or 0.6mm 2 The projected area of ​​the second weld portion 232 on the second surface 22 is within the aforementioned range. The smaller projected area of ​​the second weld portion 232 on the second surface 22 is beneficial for reducing the shading area of ​​the second weld portion 232 on the first surface 21, thereby improving the performance of the photovoltaic module.

[0085] The projected area of ​​the third welded part 233 on the second surface 22 is 0.675 mm². 2 ~1.44mm 2 For example, 0.675mm 2 0.7mm 2 0.9mm 2 1.1mm 2 1.3mm 2 Or 1.44mm 2 The projected area of ​​the third weld portion 233 on the second surface 22 is within the aforementioned range. The larger projected area of ​​the third weld portion 233 on the second surface 22 can increase the contact area between the third weld portion 233 and the solder strip 24, improve the connection strength between the third weld portion 233 and the solder strip 24, and help reduce the risk of poor soldering between the weld portion 23 and the solder strip 24 in the third edge area, thereby improving the performance of the photovoltaic module.

[0086] The projected area of ​​the fourth welded part 234 on the second surface 22 is 0.18 mm². 2 ~0.6mm 2 For example, 0.18mm 2 0.2mm 2 0.3mm 2 0.4mm 2 0.5mm 2 or 0.6mm2 The projected area of ​​the fourth welding part 234 on the second surface 22 is within the above-mentioned range. The smaller projected area of ​​the fourth welding part 234 on the second surface 22 is beneficial to reducing the light-shielding area of ​​the fourth welding part 234 on the second surface 22, thereby improving the performance of the photovoltaic module.

[0087] Figure 6 This is a schematic diagram of a first welded part provided in an embodiment of the present disclosure.

[0088] refer to Figure 3 , Figure 4 and Figure 6 In some embodiments, the first welding portion 231 includes a first main body portion 2311 and a first gradient portion 2312. The first gradient portion 2312 is connected to the first main body portion 2311 and is located on the side of the first main body portion 2311 opposite to the second solar cell 20b. In the direction from the second solar cell 20b to the first solar cell 20a, the width of the first gradient portion 2312 gradually decreases along the second direction Y. Compared to using a first gradient portion 2312 with a constant width (i.e., the width of the first gradient portion 2312 is the same everywhere along the second direction Y), the gradual decrease in the width of the first gradient portion 2312 along the second direction Y can reduce the light-shielding area of ​​the first gradient portion 2312 on the solar cell 20, thereby improving the performance of the photovoltaic module.

[0089] Figure 7 This is a schematic diagram of a third welding part provided in an embodiment of the present disclosure.

[0090] refer to Figure 3 , Figure 4 and Figure 7 In some embodiments, the third welding portion 233 includes a second main body portion 2331 and a second gradient portion 2332. The second gradient portion 2332 is connected to the second main body portion 2331 and is located on the side of the second main body portion 2331 opposite to the first solar cell 20a. In the direction from the first solar cell 20a to the second solar cell 20b, the width of the first gradient portion 2332 gradually decreases along the second direction Y. Compared to using a second gradient portion 2332 with a constant width (i.e., the width of the second gradient portion 2332 is the same everywhere along the second direction Y), the gradually decreasing width of the second gradient portion 2332 along the second direction Y can reduce the light-shielding area of ​​the second gradient portion 2332 on the solar cell 20, thereby improving the performance of the photovoltaic module.

[0091] Figure 8 This is another structural schematic diagram of the first welded part provided in an embodiment of this disclosure.

[0092] refer to Figure 3 , Figure 4 and Figure 8In some embodiments, the first gradient portion 2312 includes a first contour line and a second contour line. In the direction from the second battery cell 20b to the first battery cell 20a, the distance between the first and second contour lines along the second direction Y gradually decreases. Both the first and second contour lines are arcs. In the direction from the second battery cell 20b to the first battery cell 20a, the absolute value of the slope of both the first and second contour lines gradually decreases. The distance between the first and second contour lines along the second direction Y is the width of the first gradient portion 2312 along the second direction Y. Compared to a scheme where the first and second contour lines are straight lines, the gradual decrease in the absolute value of the slope of both the first and second contour lines ensures sufficient contact area between the solder ribbon 24 and the first gradient portion 2312 while saving material in the first gradient portion 2312.

[0093] Figure 9 This is another structural schematic diagram of the third welded part provided in an embodiment of this disclosure.

[0094] refer to Figure 3 , Figure 4 and Figure 9 The second gradient section 2332 includes a third contour line and a fourth contour line. In the direction from the first battery cell 20a to the second battery cell 20b, the distance between the third and fourth contour lines along the second direction Y gradually decreases. Both the third and fourth contour lines are arcs. In the direction from the first battery cell 20a to the second battery cell 20b, the absolute value of the slope of both the third and fourth contour lines gradually decreases. Compared to a scheme where the third and fourth contour lines are straight lines, the gradual decrease in the absolute value of the slope of both the third and fourth contour lines ensures sufficient contact area between the solder ribbon 24 and the second gradient section 2332 while saving material in the second gradient section 2332.

[0095] Figures 3 to 9 In the example, the first main body 2311 is shown to have a rectangular orthographic projection shape on the first surface 21, and the second main body 2331 is shown to have a rectangular orthographic projection shape on the second surface 22. In reality, the orthographic projection shape of the first main body 2311 on the first surface 21 can also be a circle, trapezoid, polygon, etc., and the orthographic projection shape of the second main body 2331 on the second surface 22 can also be a circle, trapezoid, polygon, etc.

[0096] In some embodiments, the width of the first main body portion 2311 along the first direction X is 0.6 mm to 0.8 mm, for example, 0.6 mm, 0.7 mm, or 0.8 mm. The length of the first main body portion 2311 along the second direction Y is 1 mm to 1.2 mm, for example, 1 mm, 1.1 mm, or 1.2 mm. The width and length of the first main body portion 2311 are within the above ranges. A larger width and length of the first main body portion 2311 can provide a larger contact area for the first welding portion 231 to contact the welding strip 24, which is beneficial to improving the connection strength between the first welding portion 231 and the welding strip 24.

[0097] The width of the first gradient portion 2312 along the first direction X is 0.3mm to 0.8mm, for example, 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm or 0.8mm. The length of the end of the first gradient portion 2312 near the first main body portion 2311 along the second direction Y is 1mm to 1.2mm, for example, 1mm, 1.1mm or 1.2mm.

[0098] The width of the second main body portion 2331 along the first direction X is 0.6mm to 0.8mm, for example, 0.6mm, 0.7mm, or 0.8mm, and the length of the second main body portion 2331 along the second direction Y is 1mm to 1.2mm, for example, 1mm, 1.1mm, or 1.2mm. The width and length of the second main body portion 2331 are within the above ranges. A larger width and length of the second main body portion 2331 can provide a larger contact area for the third welding portion 233333 to contact the welding strip 2434, which is beneficial for improving the connection strength between the third welding portion 233333 and the welding strip 2434.

[0099] The width of the second gradient portion 2332 along the first direction X is 0.3mm to 0.8mm, for example, 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm or 0.8mm. The length of the end of the second gradient portion 2332 near the second main body portion 2331 along the second direction Y is 1mm to 1.2mm, for example, 1mm, 1.1mm or 1.2mm.

[0100] In other embodiments, the projected area of ​​the weld portion 23 on the second edge region 222 of the first battery cell 20a on the second surface 22 is equal to the projected area of ​​the weld portion 23 on the middle region 223 of the first battery cell 20a on the second surface 22, and the projected area of ​​the weld portion 23 on the first edge region 221 of the second battery cell 20b on the second surface 22 is equal to the projected area of ​​the weld portion 23 on the middle region 223 of the second battery cell 20b on the second surface 22. That is, by simply increasing the width of the first widening portion 241, the contact area between at least one weld portion 23 on the second edge region 222 of the first battery cell 20a and the solder strip 24 can be increased without increasing the projected area of ​​the weld portion 23 on the first edge region 221 on the second surface 22, thereby improving the light absorption efficiency of the battery cell 20.

[0101] In some embodiments, for the same solder strip 24, the contact area between the solder portion 23 adjacent to the second battery cell 20b on the second edge region 222 of the first battery cell 20a and the solder strip 24 is larger than the contact area between the solder portion 23 and the solder strip 24 on the middle region 223 of the first battery cell 20a; similarly, the contact area between the solder portion 23 adjacent to the first battery cell 20a on the first edge region 221 of the second battery cell 20a and the solder strip 24 is larger than the contact area between the solder portion 23 and the solder strip 24 on the middle region 223 of the second battery cell 20b. The solder portion 23 adjacent to the second battery cell 20b on the first edge region 221 of the first battery cell 20a, i.e., the solder portion 23 closest to the second battery cell 20b and the solder strip 24, has the greatest risk of poor soldering. Therefore, by setting a larger contact area for the welding portion 23 adjacent to the second cell 20b on the first edge region 221 of the first cell 20a, the risk of poor soldering between the welding portion 23 and the solder ribbon 24 on the first edge region 221 of the second cell 20b can be effectively reduced, thus improving the performance of the photovoltaic module. The welding portion 23 and solder ribbon 24 closest to the first cell 20a on the first edge region 221 of the second cell 20b have the greatest risk of poor soldering. Therefore, setting a larger contact area for the welding portion 23 adjacent to the first cell 20a on the first edge region 221 of the second cell 20b can effectively reduce the risk of poor soldering between the welding portion 23 and the solder ribbon 24 on the first edge region 221 of the second cell 20b, thus improving the performance of the photovoltaic module.

[0102] In some embodiments, the photovoltaic module further includes an encapsulating film and a cover plate. The encapsulating film covers the surface of the cell string; the cover plate covers the surface of the encapsulating film opposite to the cell string.

[0103] In some embodiments, the encapsulating film includes a first encapsulating layer and a second encapsulating layer. The first encapsulating layer covers one of the first surface 2121 and the second surface 2222 of the battery cell 2020, and the second encapsulating layer covers the other of the first surface 2121 and the second surface 2222 of the battery cell 2020. Specifically, at least one of the first encapsulating layer or the second encapsulating layer can be an organic encapsulating film such as polyvinyl butyral (PVB) film, ethylene-vinyl acetate copolymer (EVA) film, polyvinyl octene coelastomer (POE) film, or polyethylene terephthalate (PET) film.

[0104] In some embodiments, the cover plate can be a glass cover plate, a plastic cover plate, or other cover plate with light-transmitting function. Specifically, the surface of the cover plate facing the encapsulating film can be an uneven surface or a textured surface containing multiple raised structures, thereby increasing the utilization rate of incident light. The cover plate includes a first cover plate and a second cover plate, the first cover plate being opposite to the first encapsulation layer, and the second cover plate being opposite to the second encapsulation layer.

[0105] In this embodiment, by increasing the width of the first widened portion 241 on the second edge region 222 of the first solar cell 20a and the first edge region 221 of the second solar cell 20b, and increasing the orthogonal projection area of ​​the first welding portion 231 on the second surface 22 on the second edge region 222 of the first solar cell 20a, and simultaneously increasing the orthogonal projection area of ​​the third welding portion 233 on the first edge region 221 of the second solar cell 20b on the second surface 22, the contact area between at least one welding portion 23 on the second edge region 222 of the first solar cell 20a and the welding ribbon 24, and the contact area between at least one welding portion 23 on the first edge region 221 of the second solar cell 20b and the welding ribbon 24, the connection strength between the welding portion 23 on the second edge region 222 of the first solar cell 20a and the welding ribbon 24 on the first edge region 221 of the first solar cell 20a can be effectively improved, thereby enhancing the performance of the photovoltaic module.

[0106] Figure 10 This is a schematic diagram of a second partial structure of a photovoltaic module provided in an embodiment of this disclosure. Figure 11 This is a second partial top view of a photovoltaic module provided in an embodiment of this disclosure.

[0107] refer to Figure 10 and Figure 11The photovoltaic module includes: a plurality of solar cells 30, each solar cell 30 having a first surface 31 and a second surface 32 facing each other. The second surface 32 is provided with a plurality of grid lines and a welding portion 33 electrically contacting the corresponding grid lines. The second surface 32 includes a first edge region 321 and a second edge region 322 arranged at intervals in a first direction X, and an intermediate region 323 located between the first edge region 321 and the second edge region 322. The plurality of solar cells 30 includes a first solar cell 30a and a second solar cell 30b arranged adjacent to each other. The second surface 32 of the first solar cell 30a and the second surface 32 of the second solar cell 30b face the same direction, and the second edge region 322 of the first solar cell 30a is adjacent to the second solar cell 30b, and the first edge region 321 of the second solar cell 30b is adjacent to the first solar cell 30a. The photovoltaic module also includes a solder ribbon 34, which is in electrical contact with a welding portion 33 on the second surface 32 of the first cell 30a and also in electrical contact with a welding portion 33 on the second surface 32 of the second cell 30b. Specifically, for the same solder ribbon 34, the contact area between at least one welding portion 33 on the second edge region 322 of the first cell 30a and the solder ribbon 34 is larger than the contact area between the welding portion 33 on the middle region 323 of the first cell 30a and the solder ribbon 34, and the contact area between at least one welding portion 33 on the first edge region 321 of the second cell 30b and the solder ribbon 34 is larger than the contact area between the welding portion 33 on the middle region 323 of the second cell 30b and the solder ribbon 34.

[0108] In some embodiments, the solder strip 34 includes: a first widening portion 341, which is electrically connected to at least one solder portion 33 on the second edge region 322 of the first battery cell 30a; and a first extension portion 342, which is connected to the first widening portion 341 and extends along a first direction X; wherein the width of the first widening portion 341 along a second direction Y is greater than the width of the first extension portion 342 along the second direction Y.

[0109] In some embodiments, the projected area of ​​the weld portion 33 on the second edge region 322 of the first battery cell 30a on the second surface 32 is equal to the projected area of ​​the weld portion 33 on the middle region 323 of the first battery cell 30a on the second surface 32. That is, the contact area between at least one weld portion 33 on the second edge region 322 of the first battery cell 30a and the solder strip 34 can be increased simply by setting the width of the first widened portion 341 on the second edge region 322 of the first battery cell 30a to be larger.

[0110] The width of the first widened portion 341 along the second direction Y is greater than the width of the first extension portion 342 along the second direction Y. That is, the width of the first widened portion 341 is larger. This larger width increases the contact area between the weld portion 33 and the solder strip 34 on the second edge region 322 of the first solar cell 30a, reducing the risk of poor soldering between the weld portion 33 and the solder strip 34 on the second edge region 322 of the first solar cell 30a, thereby improving the performance of the photovoltaic module. Furthermore, the smaller width of the first extension portion 342 reduces the shading area of ​​the first extension portion 342 on the solar cell 30, which also helps improve the performance of the photovoltaic module.

[0111] In some embodiments, for the same solder strip 34, at least one solder portion 33 located on the first edge region 321 of the second battery cell 30b is a third solder portion 333, and the solder portion 33 located on the middle region 323 of the second battery cell 30b is a fourth solder portion 334. The projected area of ​​the third solder portion 333 on the second surface 32 is greater than the projected area of ​​the fourth solder portion 334 on the second surface 32.

[0112] In some embodiments, the width of the solder ribbon 34 on the first edge region 321 of the second solar cell 30b along the second direction Y is equal to the width of the solder ribbon 34 on the middle region 323 of the second solar cell 30b along the second direction Y. That is, the contact area between the third solder portion 333 on the first edge region 321 of the second solar cell 30b and the solder ribbon 34 can be increased simply by increasing the projected area of ​​the third solder portion 333 on the second surface 32, without increasing the width of a portion of the solder ribbon 34 on the first edge region 321 of the second solar cell 30b. This avoids the negative impact on the photovoltaic module's absorption of sunlight caused by increasing the width of a portion of the solder ribbon 34 on the first edge region 321 of the second solar cell 30b, thereby improving the performance of the photovoltaic module.

[0113] It should be noted that the relevant parameters of the first widened portion 341, the first extended portion 342, the third welded portion 333, and the fourth welded portion 334 in the embodiments of this disclosure can be referred to the relevant parameters of the first widened portion 341, the first extended portion 342, the third welded portion 333, and the fourth welded portion 334 in the foregoing embodiments, and will not be repeated here.

[0114] Figure 12 This is a schematic diagram of a third partial structure of a photovoltaic module provided in an embodiment of this disclosure. Figure 13 This is a third partial top view of a photovoltaic module provided in an embodiment of this disclosure.

[0115] refer to Figure 12 and Figure 13The photovoltaic module includes: a plurality of solar cells 40, each solar cell 40 including a first surface 41 and a second surface 42 opposite to each other, the second surface 42 having a plurality of grid lines and a welding portion 43 electrically contacting the corresponding grid lines, the second surface 42 including a first edge region 421 and a second edge region 422 spaced apart in a first direction and an intermediate region 423 located between the first edge region 421 and the second edge region 422, the plurality of solar cells 40 including a first solar cell 40a and a second solar cell 40b arranged adjacent to each other, the second surface 42 of the first solar cell 40a and the second surface 42 of the second solar cell 40b having the same orientation, and the second edge region 422 of the first solar cell 40a being adjacent to the second solar cell 40b, and the first edge region 421 of the second solar cell 40b being adjacent to the first solar cell 40a. The photovoltaic module also includes a solder ribbon 44, which is in electrical contact with a welding portion 43 on the second surface 42 of the first cell 40a and also in electrical contact with a welding portion 43 on the second surface 42 of the second cell 40b. Specifically, for the same solder ribbon 44, the contact area between at least one welding portion 43 on the second edge region 422 of the first cell 40a and the solder ribbon 44 is larger than the contact area between the welding portion 43 on the middle region 423 of the first cell 40a and the solder ribbon 44, and the contact area between at least one welding portion 43 on the first edge region 421 of the second cell 40b and the solder ribbon 44 is larger than the contact area between the welding portion 43 on the middle region 423 of the second cell 40b and the solder ribbon 44.

[0116] In some embodiments, the solder strip 44 includes: a first widening portion 441, which is in electrical contact with at least one solder portion 43 on a first edge region 421 of the second battery cell 40b; and a first extension portion 442, which is connected to the first widening portion 441 and extends along a first direction; wherein the width of the first widening portion 441 along a second direction is greater than the width of the first extension portion 442 along the second direction.

[0117] In some embodiments, the projected area of ​​the weld portion 43 on the second edge region 422 of the first battery cell 40a on the second surface 42 is equal to the projected area of ​​the weld portion 43 on the middle region 423 of the first battery cell 40a on the second surface 42. That is, the contact area between at least one weld portion 43 on the first edge region 421 of the second battery cell 40b and the solder strip 44 can be increased simply by setting the width of the first widening portion 441 to be larger.

[0118] In some embodiments, for the same solder strip 44, at least one solder portion 43 located on the second edge region 422 of the first battery cell 40a is a first solder portion 431, and a solder portion 43 located on the middle region 423 of the first battery cell 40a is a second solder portion 432. The orthogonal projection area of ​​the first solder portion 431 on the second surface 42 is greater than the orthogonal projection area of ​​the second solder portion 432 on the second surface 42.

[0119] In some embodiments, the width of the solder ribbon 44 on the second edge region 422 of the first solar cell 40a along the second direction Y is equal to the width of the solder ribbon 44 on the middle region 423 of the first solar cell 40a along the second direction Y. That is, the contact area between the solder portion 43 and the solder ribbon 44 on the second edge region 422 of the first solar cell 40a can be increased simply by increasing the area of ​​the first weld portion 431 projected onto the first surface 41, without increasing the width of a portion of the solder ribbon 44 on the second edge region 422 of the first solar cell 40a. This avoids the negative impact on the photovoltaic module's absorption of sunlight caused by increasing the width of a portion of the solder ribbon 44 on the second edge region 422 of the first solar cell 40a, thereby improving the performance of the photovoltaic module.

[0120] It should be noted that the relevant parameters of the first widened portion 441, the first extended portion 442, the first welded portion 431 and the second welded portion 432 in the embodiments of this disclosure can be referred to the relevant parameters of the first widened portion 241, the first extended portion 242, the first welded portion 231 and the second welded portion 232 in the foregoing embodiments, and will not be repeated here.

[0121] Figure 14 This is a schematic diagram of a fourth partial structure of a photovoltaic module provided in an embodiment of this disclosure. Figure 15 This is a fourth partial top view of a photovoltaic module provided in an embodiment of this disclosure.

[0122] refer to Figure 14 and Figure 15The photovoltaic module includes: a plurality of solar cells 50, each solar cell 50 having a first surface 51 and a second surface 52 facing each other, the second surface 52 having a plurality of grid lines and a welding portion 53 electrically contacting the corresponding grid lines, the second surface 52 having a first edge region 521 and a second edge region 522 spaced apart in a first direction and an intermediate region 523 located between the first edge region 521 and the second edge region 522, the plurality of solar cells 50 including a first solar cell 50a and a second solar cell 50b arranged adjacent to each other, the second surface 52 of the first solar cell 50a and the second surface 52 of the second solar cell 50b having the same orientation, and the second edge region 522 of the first solar cell 50a being adjacent to the second solar cell 50b, and the first edge region 521 of the second solar cell 50b being adjacent to the first solar cell 50a. The photovoltaic module also includes a solder ribbon 54, which is in electrical contact with a welding portion 53 on the second side 52 of the first cell 50a and also in electrical contact with a welding portion 53 on the second side 52 of the second cell 50b. Specifically, for the same solder ribbon 54, the contact area between at least one welding portion 53 on the second edge region 522 of the first cell 50a and the solder ribbon 54 is larger than the contact area between the welding portion 53 on the middle region 523 of the first cell 50a and the solder ribbon 54, and the contact area between at least one welding portion 53 on the first edge region 521 of the second cell 50b and the solder ribbon 54 is larger than the contact area between the welding portion 53 on the middle region 523 of the second cell 50b and the solder ribbon 54.

[0123] In some embodiments, for the same solder strip 54, at least one solder portion 53 located on the second edge region 522 of the first battery cell 50a is a first solder portion 531, and a solder portion 53 located on the middle region 523 of the first battery cell 50a is a second solder portion 532. The orthographic projection area of ​​the first solder portion 531 on the second surface 52 is greater than the orthographic projection area of ​​the second solder portion 532 on the second surface 52. At least one solder portion 53 located on the first edge region 521 of the second battery cell 50b is a third solder portion 533, and a solder portion 53 located on the middle region 523 of the second battery cell 50b is a fourth solder portion 534. The orthographic projection area of ​​the third solder portion 533 on the second surface 52 is greater than the orthographic projection area of ​​the fourth solder portion 534 on the second surface 52.

[0124] In some embodiments, the width of the solder strip 54 on the second edge region 522 of the first battery cell 50a along the second direction Y is equal to the width of the solder strip 54 on the middle region 523 of the first battery cell 50a along the second direction Y, and the width of the solder strip 54 on the first edge region 521 of the second battery cell 50b along the second direction Y is equal to the width of the solder strip 54 on the middle region 523 of the second battery cell 50b along the second direction Y.

[0125] In this way, the contact area between the first weld portion 531 and the solder ribbon 54 on the second edge region 522 of the first solar cell 50a can be increased simply by increasing the projected area of ​​the first weld portion 531 on the second surface 52, without increasing the width of the solder ribbon 54 on the second edge region 522 of the first solar cell 50a. This avoids the negative impact on the photovoltaic module's absorption of sunlight caused by increasing the width of the solder ribbon 54 on the second edge region 522 of the first solar cell 50a, thereby improving the performance of the photovoltaic module. Similarly, the contact area between the third weld portion 533 and the solder ribbon 54 on the first edge region 521 of the second solar cell 50b can be increased simply by increasing the projected area of ​​the third weld portion 533 on the second surface 52, without increasing the width of the solder ribbon 54 on the first edge region 521 of the second solar cell 50b. This avoids the negative impact on the photovoltaic module's absorption of sunlight caused by increasing the width of the solder ribbon 54 on the first edge region 521 of the second solar cell 50b, thereby improving the performance of the photovoltaic module.

[0126] It should be noted that the relevant parameters of the first welding part 531, the second welding part 532, the third welding part 533 and the fourth welding part 534 in the embodiments of this disclosure can be referred to the relevant parameters of the first welding part 231, the second welding part 232, the third welding part 233 and the fourth welding part 234 in the foregoing embodiments, and will not be repeated here.

[0127] Figure 16 This is a schematic diagram of a fifth partial structure of a photovoltaic module provided in an embodiment of this disclosure. Figure 17 This is a fifth partial top view of a photovoltaic module provided in an embodiment of this disclosure.

[0128] refer to Figure 16 and Figure 17The photovoltaic module includes: a plurality of solar cells 60, each solar cell 60 having a first surface 61 and a second surface 62 facing each other. The second surface 62 is provided with a plurality of grid lines and a welding portion 63 electrically contacting the corresponding grid lines. The second surface 62 includes a first edge region 621 and a second edge region 622 arranged at intervals in a first direction, and an intermediate region 623 located between the first edge region 621 and the second edge region 622. The plurality of solar cells 60 includes a first solar cell 60a and a second solar cell 60b arranged adjacent to each other. The second surface 62 of the first solar cell 60a and the second surface 62 of the second solar cell 60b face the same direction, and the second edge region 622 of the first solar cell 60a is adjacent to the second solar cell 60b, and the first edge region 621 of the second solar cell 60b is adjacent to the first solar cell 60a. The photovoltaic module also includes a solder ribbon 64, which is in electrical contact with a welding portion 63 on the second surface 62 of the first cell 60a and also in electrical contact with a welding portion 63 on the second surface 62 of the second cell 60b. Specifically, for the same solder ribbon 64, the contact area between at least one welding portion 63 on the second edge region 622 of the first cell 60a and the solder ribbon 64 is larger than the contact area between the welding portion 63 on the middle region 623 of the first cell 60a and the solder ribbon 64, and the contact area between at least one welding portion 63 on the first edge region 621 of the second cell 60b and the solder ribbon 64 is larger than the contact area between the welding portion 63 on the middle region 623 of the second cell 60b and the solder ribbon 64.

[0129] It should be noted that the battery cell 60, the first edge region 611, the second edge region 621, the first widening portion 641, the first extension portion 642, the second welding portion 632 and the fourth welding portion 634 in the embodiments of this disclosure can refer to the battery cell 20, the first edge region 211, the second edge region 221, the first widening portion 241, the first extension portion 242, the second welding portion 232 and the fourth welding portion 234 in the foregoing embodiments.

[0130] In some embodiments, for the same solder strip 64, the contact area between at least one solder portion 63 on the first edge region 621 of the first battery cell 60a and the solder strip 64 is greater than the contact area between the solder portion 63 on the middle region 623 of the first battery cell 60a and the solder strip 64, and the contact area between at least one solder portion 63 on the second edge region 622 of the second battery cell 60b and the solder strip 64 is greater than the contact area between the solder portion 63 on the middle region 623 of the second battery cell 60b and the solder strip 64.

[0131] In some embodiments, the solder strip 64 includes: a second widening portion 643, which is electrically connected to at least one welding portion 63 on the first edge region 621 of the first battery cell 60a, and electrically contacts at least one welding portion 63 on the second edge region 622 of the second battery cell 60b; the solder strip 64 also includes a first extension portion 642, which is connected to the second widening portion 643 and extends along a first direction; wherein the width of the second widening portion 643 along a second direction is greater than the width of the first extension portion 642 along the second direction.

[0132] In some embodiments, for the same solder strip 64, at least one solder portion 63 located on the first edge region 621 of the first battery cell 60a is a fifth solder portion 635, and the solder portion 63 located on the middle region 623 of the first battery cell 60a is a second solder portion 632. The orthographic projection area of ​​the fifth solder portion 635 on the second surface 62 is greater than the orthographic projection area of ​​the second solder portion 632 on the second surface 62. For the same solder strip 64, at least one solder portion 63 located on the second edge region 622 of the second battery cell 60b is a sixth solder portion 636, and the solder portion 63 located on the middle region 623 of the second battery cell 60b is a fourth solder portion 634. The orthographic projection area of ​​the sixth solder portion 636 on the second surface 62 is greater than the orthographic projection area of ​​the fourth solder portion 634 on the second surface 62.

[0133] In some embodiments, the projected area of ​​the fifth welded portion 635 on the second surface 62 is 0.675 mm. 2 ~1.44mm 2 For example, 0.675mm 2 0.7mm 2 0.9mm 2 1.1mm 2 1.3mm 2 Or 1.44mm 2 The projected area of ​​the second welded part 632 on the second surface 62 is 0.18 mm². 2 ~0.6mm 2 For example, 0.18mm 2 0.2mm 2 0.3mm 2 0.4mm 2 0.5mm 2 or 0.6mm 2 .

[0134] The projected area of ​​the sixth welded part 636 on the second surface 62 is 0.675 mm². 2 ~1.44mm 2 For example, 0.675mm 2 0.7mm2 0.9mm 2 1.1mm 2 1.3mm 2 Or 1.44mm 2 The projected area of ​​the fourth welded part 634 on the second surface 62 is 0.18 mm². 2 ~0.6mm 2 For example, 0.18mm 2 0.2mm 2 0.3mm 2 0.4mm 2 0.5mm 2 or 0.6mm 2 .

[0135] In some embodiments, the fifth welding portion 635 includes a third main body portion 6351 and a third gradient portion 6352. The third gradient portion 6352 is connected to the third main body portion 6351 and is located on the side of the third main body portion 6351 near the second solar cell 60b. In the direction from the first solar cell 60a to the second solar cell 60b, the width of the third gradient portion 6352 gradually decreases along the second direction Y. The gradual decrease in the width of the third gradient portion 6352 along the second direction Y can reduce the light-shielding area of ​​the third gradient portion 6352 on the solar cell 60, thereby improving the performance of the photovoltaic module.

[0136] The sixth welding portion 636 includes a fourth main body portion 6361 and a fourth gradient portion 6362. The fourth gradient portion 6362 is connected to the fourth main body portion 6361 and is located on the side of the fourth main body portion 6361 near the first solar cell 60a. In the direction from the second solar cell 60b to the first solar cell 60a, the width of the fourth gradient portion 6362 gradually decreases along the second direction Y. The gradual decrease in the width of the fourth gradient portion 6362 along the second direction Y can reduce the light-shielding area of ​​the fourth gradient portion 6362 on the solar cell 60, thereby improving the performance of the photovoltaic module.

[0137] In some embodiments, the width of the third main body portion 6351 along the first direction X is 0.6mm to 0.8mm, for example 0.6mm, 0.7mm or 0.8mm, and the length of the third main body portion 6351 along the second direction Y is 1mm to 1.2mm, for example 1mm, 1.1mm or 1.2mm.

[0138] The width of the third gradient portion 6352 along the first direction X is 0.3mm to 0.8mm, for example, 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm or 0.8mm. The length of the end of the third gradient portion 6352 near the third main body portion 6351 along the second direction Y is 1mm to 1.2mm, for example, 1mm, 1.1mm or 1.2mm.

[0139] The width of the fourth main body 6361 along the first direction X is 0.6mm to 0.8mm, for example 0.6mm, 0.7mm or 0.8mm, and the length of the fourth main body 6361 along the second direction Y is 1mm to 1.2mm, for example 1mm, 1.1mm or 1.2mm.

[0140] The width of the fourth gradient portion 6362 along the first direction X is 0.3mm to 0.8mm, for example, 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, or 0.8mm. The length of the end of the fourth gradient portion 6362 near the fourth main body portion 6361 along the second direction Y is 1mm to 1.2mm, for example, 1mm, 1.1mm, or 1.2mm.

[0141] Figure 18 This is a schematic diagram of a fifth welding part provided in an embodiment of the present disclosure.

[0142] Refer to Figure 16 Figure 18 In some embodiments, the third gradient portion 6352 includes a fifth contour line and a sixth contour line. In the direction from the first battery cell 60a to the second battery cell 60b, the distance between the fifth and sixth contour lines along the second direction Y gradually decreases. Both the fifth and sixth contour lines are arcs. In the direction from the first battery cell 60a to the second battery cell 60b, the absolute value of the slope of both the fifth and sixth contour lines gradually decreases. The distance between the fifth and sixth contour lines along the second direction Y is the width of the third gradient portion 6352 along the second direction Y. Compared to a scheme where the fifth and sixth contour lines are straight lines, the gradual decrease in the absolute value of the slope of both contour lines ensures sufficient contact area between the solder ribbon 64 and the third gradient portion 6352 while saving material in the third gradient portion 6352.

[0143] Figure 19 This is a schematic diagram of a sixth welding part provided in an embodiment of the present disclosure.

[0144] refer to Figure 17 and Figure 19The fourth gradient section 6362 includes a seventh contour line and an eighth contour line. In the direction from the second battery cell 60b to the first battery cell 60a, the distance between the seventh and eighth contour lines along the second direction Y gradually decreases. Both the seventh and eighth contour lines are arcs. In the direction from the second battery cell 60b to the first battery cell 60a, the absolute value of the slope of both the seventh and eighth contour lines gradually decreases. The distance between the seventh and eighth contour lines along the second direction Y is the width of the fourth gradient section 6362 along the second direction Y. Compared to a scheme where the seventh and eighth contour lines are straight lines, the gradual decrease in the absolute value of the slope of both contour lines ensures sufficient contact area between the solder ribbon 64 and the fourth gradient section 6362 while saving material in the fourth gradient section 6362.

[0145] Referring again to Figures 1-6, in this embodiment, by increasing the width of the solder ribbon 64 in the first edge region 621 of the first battery cell 60a and increasing the projected area of ​​the solder portion 63 on the second surface 62 in the first edge region 621 of the first battery cell 60a, the contact area between at least one solder portion 63 on the first edge region 621 of the first battery cell 60a and the solder ribbon 64 is made larger than the contact area between the solder portion 63 on the middle region 623 of the first battery cell 60a and the solder ribbon 64. It is understood that in other embodiments, simply increasing the width of the solder ribbon 64 in the first edge region 621 of the first battery cell 60a, or simply increasing the projected area of ​​the solder portion 63 on the second surface 62 in the first edge region 621 of the first battery cell 60a, can also make the contact area between at least one solder portion 63 on the first edge region 621 of the first battery cell 60a and the solder ribbon 64 larger than the contact area between the solder portion 63 on the middle region 623 of the first battery cell 60a.

[0146] Similarly, in this embodiment, by setting the width of the solder ribbon 64 of the second edge region 622 of the second battery cell 60b to be larger, and by increasing the orthogonal projection area of ​​the solder portion 63 on the second edge region 622 of the second battery cell 60b on the second surface 62, the contact area between at least one solder portion 63 on the second edge region 622 of the second battery cell 60b and the solder ribbon 64 is made larger than the contact area between the solder portion 63 on the middle region 623 of the second battery cell 60b and the solder ribbon 64. It is understood that in other embodiments, simply setting the width of the solder ribbon 64 of the second edge region 622 of the second battery cell 60b to be larger, or simply increasing the orthogonal projection area of ​​the solder portion 63 on the second edge region 622 of the second battery cell 60b on the second surface 62, can make the contact area between at least one solder portion 63 on the second edge region 622 of the second battery cell 60b and the solder ribbon 64 larger than the contact area between the solder portion 63 on the middle region 623 of the second battery cell 60b.

[0147] Those skilled in the art will understand that the above embodiments are specific examples of implementing this disclosure, and in practical applications, various changes in form and detail may be made without departing from the spirit and scope of this disclosure. Any person skilled in the art can make various alterations and modifications without departing from the spirit and scope of this disclosure; therefore, the scope of protection of this disclosure should be determined by the scope defined in the claims.

Claims

1. A photovoltaic module, characterized by, include: A plurality of battery cells, each battery cell including a first side and a second side facing each other, the second side having a plurality of grid lines and a welding portion electrically contacting the corresponding grid lines, the second side including a first edge region and a second edge region spaced apart in a first direction and an intermediate region located between the first edge region and the second edge region, the plurality of battery cells including a first battery cell and a second battery cell arranged adjacent to each other, the second side of the first battery cell and the second side of the second battery cell having the same orientation, and the second edge region of the first battery cell being adjacent to the second battery cell, and the first edge region of the second battery cell being adjacent to the first battery cell; The welding strip is in electrical contact with the welding portion on the second surface of the first battery cell, and also in electrical contact with the welding portion on the second surface of the second battery cell; Specifically, for the same solder strip, the contact area between at least one of the welded portions on the second edge region of the first battery cell and the solder strip is greater than the contact area between the welded portion on the middle region of the first battery cell and the solder strip, and the contact area between at least one of the welded portions on the first edge region of the second battery cell and the solder strip is greater than the contact area between the welded portion on the middle region of the second battery cell and the solder strip.

2. The photovoltaic module of claim 1, wherein, The welding strip includes: A first widening portion, wherein the first widening portion is electrically connected to at least one of the welded portions on the second edge region of the first battery cell, and / or, the first widening portion is electrically in contact with at least one of the welded portions on the first edge region of the second battery cell; A first extension portion, which is connected to the first widened portion and extends along the first direction; Wherein, the width of the first widened portion along the second direction is greater than the width of the first extended portion along the second direction.

3. The photovoltaic module of claim 2, wherein, The thickness of the first widened portion is less than the thickness of the first extended portion.

4. The photovoltaic module according to claim 2, characterized in that, The width of the first widened portion along the second direction is 0.4mm to 0.8mm, and the width of the first extended portion along the second direction is 0.20mm to 0.28mm.

5. The photovoltaic module of claim 2, wherein, The first widened portion is electrically connected to at least one of the welded portions on the second edge region of the first battery cell, and the first widened portion is electrically in contact with at least one of the welded portions on the first edge region of the second battery cell. The orthographic projection area of ​​the welded portion on the second edge region of the first battery cell on the second surface is equal to the orthographic projection area of ​​the welded portion on the middle region of the first battery cell on the second surface, and the orthographic projection area of ​​the welded portion on the first edge region of the second battery cell on the second surface is equal to the orthographic projection area of ​​the welded portion on the middle region of the second battery cell on the second surface.

6. The photovoltaic module of claim 1 or 2, wherein, For the same solder strip, at least one of the welded portions located on the second edge region of the first battery cell is a first welded portion, and the welded portion located on the middle region of the first battery cell is a second welded portion. The orthographic projection area of ​​the first welded portion on the second surface is greater than the orthographic projection area of ​​the second welded portion on the second surface. And / or, For the same solder strip, at least one of the welded portions located on the first edge region of the second battery cell is a third welded portion, and the welded portion located on the middle region of the second battery cell is a fourth welded portion. The projected area of ​​the third welded portion on the second surface is greater than the projected area of ​​the fourth welded portion on the second surface.

7. The photovoltaic module of claim 6, wherein, The first welding portion has a projected area on the second face of 0.675 mm 2 ~ 1.44 mm 2 The second welding portion has a projected area on the second face of 0.18 mm 2 ~ 0.6 mm 2 ; The third welding portion has an area of a normal projection on the second face of 0.675 mm 2 ~ 1.44 mm 2 The fourth welding portion has an area of a normal projection on the second face of 0.18 mm 2 ~ 0.6 mm 2 .

8. The photovoltaic module of claim 6, wherein, The first welded portion includes: a first main body portion and a first gradient portion, the first gradient portion being connected to the first main body portion and located on the side of the first main body portion opposite to the second battery cell, and the width of the first gradient portion gradually decreasing along a second direction in the direction from the second battery cell to the first battery cell; and / or, The third welding portion includes: a second main body portion and a second gradient portion. The second gradient portion is connected to the second main body portion and is located on the side of the second main body portion away from the first battery cell. In the direction from the first battery cell to the second battery cell, the width of the first gradient portion gradually decreases along the second direction.

9. The photovoltaic module of claim 8, wherein, The first gradient section includes a first contour line and a second contour line. In the direction from the second battery cell to the first battery cell, the distance between the first contour line and the second contour line along the second direction gradually decreases. The first contour line is an arc, and the second contour line is an arc. In the direction from the second battery cell to the first battery cell, the absolute value of the slope of the first contour line gradually decreases, and the absolute value of the slope of the second contour line gradually decreases; and / or, The second gradient section includes a third contour line and a fourth contour line. In the direction from the first battery cell to the second battery cell, the distance between the third contour line and the fourth contour line along the second direction gradually decreases. The third contour line is an arc, and the fourth contour line is an arc. In the direction from the first battery cell to the second battery cell, the absolute value of the slope of the third contour line gradually decreases, and the absolute value of the slope of the fourth contour line gradually decreases.

10. The photovoltaic module of claim 8, wherein, The width of the first main body portion along the first direction is 0.6mm to 0.8mm, and the length of the first main body portion along the second direction is 1mm to 1.2mm. The width of the first gradient portion along the first direction is 0.3mm to 0.8mm, and the length of the end of the first gradient portion near the first main body portion along the second direction is 1mm to 1.2mm. The width of the second main body portion along the first direction is 0.6mm to 0.8mm, and the length of the second main body portion along the second direction is 1mm to 1.2mm. The width of the second gradient portion along the first direction is 0.3mm to 0.8mm, and the length of the end of the second gradient portion near the second main body portion along the second direction is 1mm to 1.2mm.

11. The photovoltaic module of claim 1, wherein, For the same solder strip, the contact area between the solder portion adjacent to the second battery cell on the second edge region of the first battery cell and the solder strip is greater than the contact area between the solder portion on the middle region of the first battery cell and the solder strip; the contact area between the solder portion adjacent to the first battery cell on the first edge region of the second battery cell and the solder strip is greater than the contact area between the solder portion on the middle region of the second battery cell and the solder strip.

12. The photovoltaic module of claim 1, wherein, For the same solder strip, the number of welded portions on the first edge region of the second solar cell is less than or equal to three, and the number of welded portions on the second edge region of the first solar cell is less than or equal to three; and / or, In the first direction, the ratio of the width of the first edge region to the width of the second battery cell is less than or equal to 1 / 4, and the ratio of the width of the second edge region to the width of the first battery cell is less than or equal to 1 / 4.

13. The photovoltaic module of claim 1, wherein, For the same solder strip, the contact area between at least one of the welded portions on the first edge region of the first battery cell and the solder strip is greater than the contact area between the welded portion on the middle region of the first battery cell and the solder strip, and the contact area between at least one of the welded portions on the second edge region of the second battery cell and the solder strip is greater than the contact area between the welded portion on the middle region of the second battery cell and the solder strip.

14. The photovoltaic module of claim 13, wherein, The welding strip includes: The second widening portion is electrically connected to at least one of the welded portions on the first edge region of the first battery cell, and / or the second widening portion is electrically in contact with at least one of the welded portions on the second edge region of the second battery cell; A first extension portion, which is connected to the second widened portion and extends along a first direction; Wherein, the width of the second widened portion along the second direction is greater than the width of the first extended portion along the second direction.

15. The photovoltaic module according to claim 13 or 14, characterized in that For the same solder strip, at least one of the solder portions located on the first edge region of the first battery cell is a fifth solder portion, and the solder portion located on the middle region of the first battery cell is a second solder portion. The orthographic projection area of ​​the fifth solder portion on the second surface is greater than the orthographic projection area of ​​the second solder portion on the second surface. And / or, For the same solder strip, at least one of the solder portions located on the second edge region of the second battery cell is a sixth solder portion, and the solder portion located on the middle region of the second battery cell is a fourth solder portion. The projected area of ​​the sixth solder portion on the second surface is greater than the projected area of ​​the fourth solder portion on the second surface.

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