Photovoltaic module

Abstract

The embodiment of the invention relates to the photovoltaic field, and provides a photovoltaic module, and the photovoltaic module comprises a battery piece which is provided with a first surface and a second surface which are opposite to each other in the thickness direction; the multiple welding strips extending in the first direction are arranged at intervals in the second direction, and the welding strips are located on at least one of the first face and the second face; the fixing parts are located on at least one of the first face and the second face, and the same welding strip is connected with at least two fixing parts arranged at intervals in the first direction; the welding strip is provided with a first edge part and a second edge part which are opposite in the second direction, the fixing part comprises a first sub-part and / or a second sub-part, the first sub-part is connected with the first edge part, the second sub-part is connected with the second edge part, the first sub-part comprises at least two first fixing strips arranged at intervals in the second direction, and the second sub-part comprises at least two second fixing strips arranged at intervals in the second direction. And the second sub-part comprises at least two second fixing strips which are arranged at intervals in the second direction, so that the fixing effect of the fixing part on the welding strip can be ensured, the glue amount required by the fixing part can be reduced, and the glue overflow risk can be reduced.

Description

Technical Field

[0001] The present disclosure relates to the field of photovoltaics, and particularly to a photovoltaic module. Background Art

[0002] When assembling solar cells into a photovoltaic module, solder ribbons are often used to connect adjacent solar cells. However, due to the mismatch in the coefficient of thermal expansion between the solder ribbon and the solar cell, there is a large stress between the solder ribbon and the solar cell after welding that cannot be released, resulting in serious warping of the solar cell and increasing the risk of hidden cracks in the solar cell during the subsequent lamination process.

[0003] In addition, in the process of connecting the solder ribbon to the solar cell by laminating a film or dispensing glue after placing the solder ribbon at a low temperature, the glue used to fix the solder ribbon is prone to overflow, resulting in poor contact between the solder ribbon and the solar cell when the solder ribbon is subsequently connected to the glue. In addition, the amount of glue used will also affect the fixing effect of the solder ribbon and cause a certain degree of optical blockage to the solar cell.

[0004] Therefore, the fixing method of the solder ribbon needs to be further studied. Summary of the Invention

[0005] Embodiments of the present disclosure provide a photovoltaic module, which is at least beneficial to ensuring the fixing effect of the fixing part on the solder ribbon, reducing the amount of glue required for the fixing part, and reducing the risk of glue overflow.

[0006] According to some embodiments of the present disclosure, on the one hand, embodiments of the present disclosure provide a photovoltaic module, including: a solar cell having a first surface and a second surface opposite to each other in the thickness direction; a plurality of solder ribbons extending in a first direction and arranged at intervals in a second direction, the solder ribbons being located on at least one of the first surface and the second surface; a plurality of fixing parts located on at least one of the first surface and the second surface, the same solder ribbon being connected to at least two of the fixing parts arranged at intervals in the first direction; wherein, the solder ribbon has a first edge portion and a second edge portion opposite to each other in the second direction, the fixing part includes a first sub-part and / or a second sub-part, the first sub-part is connected to the first edge portion, the second sub-part is connected to the second edge portion, and the first sub-part includes at least two first fixing strips arranged at intervals in the second direction, and the second sub-part includes at least two second fixing strips arranged at intervals in the second direction.

[0007] In some embodiments, any one of the fixing parts includes the first sub-part and the second sub-part arranged at intervals in the second direction.

[0008] In some embodiments, along the first direction, one of two adjacent fixing parts arranged at intervals includes the first sub-part, and the other includes the second sub-part.

[0009] In some embodiments, at least one of the first fixing strip and the second fixing strip includes a peripheral portion and a central portion wrapped by the peripheral portion, and the peripheral portion at least surrounds the side wall of the central portion; the viscosity of the peripheral portion is greater than that of the central portion, and the adhesion of the peripheral portion is less than or equal to that of the central portion.

[0010] In some embodiments, the material of the peripheral portion may be any one of conductive adhesive or first insulating adhesive, and the material of the central portion may be second insulating adhesive.

[0011] In some embodiments, the battery cell includes two edge regions opposite to each other along the first direction, and a central region between the two edge regions; the number of the first fixing strips included in the first sub - portion located in the edge region is the first number, and the number of the first fixing strips included in the first sub - portion located in the central region is the second number, and the first number is greater than the second number; and / or, the number of the second fixing strips included in the second sub - portion located in the edge region is the third number, and the number of the second fixing strips included in the second sub - portion located in the central region is the fourth number, and the third number is greater than the fourth number.

[0012] In some embodiments, the ratio of the first number to the second number is 1.2 to 1.3; and / or, the ratio of the third number to the fourth number is 1.2 to 1.3.

[0013] In some embodiments, the battery cell includes two edge regions opposite to each other along the first direction, and a central region between the two edge regions; the area of the orthographic projection of the first fixing strip located in the edge region on the first surface is the first area, and the area of the orthographic projection of the first fixing strip located in the central region on the first surface is the second area, and the first area is greater than the second area; and / or, the area of the orthographic projection of the second fixing strip located in the edge region on the first surface is the third area, and the area of the orthographic projection of the second fixing strip located in the central region on the first surface is the fourth area, and the third area is greater than the fourth area.

[0014] In some embodiments, the ratio of the first area to the second area is 1.2 to 1.3; and / or, the ratio of the third area to the fourth area is 1.2 to 1.3.

[0015] In some embodiments, the connecting force generated by the first sub - portion as a whole on the solder strip is not less than 1N; and / or, the connecting force generated by the second sub - portion as a whole on the solder strip is not less than 1N.

[0016] The technical solutions provided by the embodiments of the present disclosure have at least the following advantages:

[0017] The design fixing part includes the first sub - part and / or the second sub - part. The first sub - part includes at least two first fixing bars arranged at intervals along the second direction, and the second sub - part includes at least two second fixing bars arranged at intervals along the second direction. This is beneficial for having at least two spaced - apart contact surfaces between the fixing part for fixing the solder tape and the solder tape, providing multiple guarantees for the fixing effect of the solder tape, and thus facilitating ensuring a good fixing effect of the fixing part on the solder tape. In addition, on the one hand, creating gaps within the fixing part is beneficial for reducing the impact of the optical blockage caused by the fixing part on the solar cell and reducing the amount of materials required for preparing the fixing part, thereby reducing the manufacturing cost of the photovoltaic module. On the other hand, compared with the volume of the fixing part, based on the smaller volumes of the first fixing bars and the second fixing bars, even if the first fixing bar or the second fixing bar has an epitaxial phenomenon due to fluidity, the degree of epitaxy is extremely small. And the gaps between adjacent first fixing bars reserve position space for the epitaxy of the first fixing bar, and the gaps between adjacent second fixing bars reserve position space for the epitaxy of the second fixing bar. Thus, it can effectively prevent epitaxy into the area where the solder tape is in electrical contact with the solar cell, effectively reducing the risk of poor contact between the solder tape and the solar cell caused by the fixing part oozing glue, and avoiding the risk of virtual soldering. Description of the Drawings

[0018] One or more embodiments are exemplarily illustrated by the pictures in the corresponding drawings. These exemplary illustrations do not limit the embodiments unless otherwise stated. The figures in the drawings do not constitute a scale limitation. To more clearly illustrate the technical solutions in the embodiments of the present disclosure or in the traditional technology, the following will briefly introduce the drawings required for use in the embodiments. Obviously, the following - described drawings are only some embodiments of the present disclosure. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0019] Figure 1 It is a partial cross - sectional schematic diagram of a photovoltaic module provided by an embodiment of the present disclosure;

[0020] Figure 2 It is the first partial top - view schematic diagram of a photovoltaic module provided by an embodiment of the present disclosure;

[0021] Figure 3 It is the second partial top - view schematic diagram of a photovoltaic module provided by an embodiment of the present disclosure;

[0022] Figure 4 It is the third partial top - view schematic diagram of a photovoltaic module provided by an embodiment of the present disclosure;

[0023] Figure 5 It is the fourth partial top - view schematic diagram of a photovoltaic module provided by an embodiment of the present disclosure;

[0024] Figure 6 A partial cross-sectional view of the first fixing strip in a photovoltaic module provided by an embodiment of the present disclosure;

[0025] Figure 7 A partial cross-sectional view of the second fixing strip in a photovoltaic module provided by an embodiment of the present disclosure;

[0026] Figure 8 The fifth partial top view of a photovoltaic module provided by an embodiment of the present disclosure;

[0027] Figure 9 The sixth partial top view of a photovoltaic module provided by an embodiment of the present disclosure. Detailed implementation manners

[0028] As can be seen from the background art, the fixing method for the welding ribbon still needs further research.

[0029] The present disclosure provides a photovoltaic module in an embodiment. The designed fixing part includes a first sub-part and / or a second sub-part. The first sub-part includes at least two first fixing strips arranged at intervals in the second direction, and the second sub-part includes at least two second fixing strips arranged at intervals in the second direction. This is beneficial to making the fixing part for fixing the welding ribbon have at least two spaced contact surfaces with the welding ribbon, so as to provide multiple guarantees for the fixing effect of the welding ribbon, thereby being beneficial to ensuring a good fixing effect of the fixing part on the welding ribbon. In addition, on the one hand, gaps are divided inside the fixing part, which is beneficial to reducing the influence of the optical blockage caused by the fixing part on the battery cell and reducing the amount of materials required for preparing the fixing part, so as to reduce the manufacturing cost of the photovoltaic module; on the other hand, compared with the volume of the fixing part, based on the smaller volumes of the first fixing strip and the second fixing strip, even if the first fixing strip or the second fixing strip has an epitaxial phenomenon due to fluidity, the epitaxial degree is extremely small, and the gap between adjacent first fixing strips reserves a position space for the epitaxy of the first fixing strip, and the gap between adjacent second fixing strips reserves a position space for the epitaxy of the second fixing strip. Thus, it can effectively avoid epitaxy to the area where the welding ribbon is in electrical contact with the battery cell, so as to effectively reduce the risk that the fixing part has a glue overflow phenomenon and causes poor contact between the welding ribbon and the battery cell, and avoid the risk of virtual soldering.

[0030] In the description of the embodiments of the present disclosure, technical terms such as "first" and "second" are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity, specific order or primary-secondary relationship of the indicated technical features. In the description of the embodiments of the present disclosure, the meaning of "a plurality" is more than two, unless otherwise specifically defined.

[0031] References to "embodiments" in this disclosure mean that the specific features, structures, or characteristics described in connection with the embodiments can be included in at least one embodiment of the present disclosure. The phrase appears in various places in the specification and does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art will explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0032] In the description of the embodiments of the present disclosure, the term "and / or" is merely a description of the association relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent three situations: the existence of A, the simultaneous existence of A and B, and the existence of B. Additionally, the character " / " in this text generally represents an "or" relationship between the associated objects before and after.

[0033] In the description of the embodiments of the present disclosure, the term "plurality" refers to two or more (including two). Similarly, "multiple groups" refers to two or more groups (including two groups), and "multiple pieces" refers to two or more pieces (including two pieces).

[0034] In the description of the embodiments of the present disclosure, the orientation or positional relationship indicated by technical terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the embodiments of the present disclosure and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation on the embodiments of the present disclosure.

[0035] In the description of the embodiments of the present disclosure, unless otherwise clearly specified and limited, technical terms such as "install", "connect", "couple", "fix", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can also be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present disclosure can be understood according to specific circumstances.

[0036] In the accompanying drawings corresponding to the embodiments of the present disclosure, for better understanding and convenience of description, the thickness and area of the layers are enlarged. 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" on the surface of the other component, or there may be a third component between the two components. On the contrary, when describing a component on the surface of another component or when another component is formed or provided on the surface of a component, it means that there is no third component between the two components. In addition, when describing a component being "substantially" formed on another component, it means that the component is not formed on the entire surface (or front surface) of the other component, nor on a partial edge of the entire surface.

[0037] In the description of the embodiments of the present disclosure, when a certain component "includes" another component, unless otherwise specified, other components are not excluded, and other components may further be included. In addition, when a component such as a layer, film, region, or plate is referred to as being "on / at" another component, it may be "directly on" the other component (i.e., on the surface of the other component with no other components therebetween), or there may be another component therebetween. In addition, 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 means that no other components are located therebetween.

[0038] The terms used in the description of the various embodiments herein are only for describing specific embodiments and are not intended to be limiting. As used in the description of the various embodiments and the appended claims, "the component" is also intended to include the plural form, unless the context clearly indicates otherwise. Among them, the component includes components such as layers, films, regions, or plates.

[0039] The embodiments of the present disclosure will be described in detail below with reference to the accompanying drawings. However, those of ordinary skill in the art can understand that in the embodiments of the present disclosure, many technical details are provided for the reader to better understand the embodiments of the present disclosure. However, even without these technical details and various changes and modifications based on the following embodiments, the technical solutions claimed in the embodiments of the present disclosure can still be implemented.

[0040] An embodiment of the present disclosure provides a photovoltaic module, and the photovoltaic module provided by an embodiment of the present disclosure will be described in detail below with reference to the accompanying drawings.

[0041] With reference to Figures 1 to 5, the photovoltaic module includes: a cell 100 having a first surface 110 and a second surface 120 opposite to each other in the thickness direction X; a plurality of welding tapes 101 extending along the first direction Y are arranged at intervals along the second direction Z, and the welding tapes 101 are located on at least one of the first surface 110 and the second surface 120; a plurality of fixing parts 102 located on at least one of the first surface 110 and the second surface 120, and the same welding tape 101 is connected to at least two fixing parts 102 arranged at intervals along the first direction Y; wherein, the welding tape 101 has a first side 111 and a second side 121 opposite to each other in the second direction Z, the fixing part 102 includes a first sub-part 112 and / or a second sub-part 122, the first sub-part 112 is connected to the first side 111, the second sub-part 122 is connected to the second side 121, and the first sub-part 112 includes at least two first fixing bars 132 arranged at intervals along the second direction Z, and the second sub-part 122 includes at least two second fixing bars 142 arranged at intervals along the second direction Z.

[0042] It should be noted that Figure 1 is a partial cross-sectional schematic diagram of a photovoltaic module provided by an embodiment of the present disclosure; Figure 2 is a first partial top view schematic diagram of a photovoltaic module provided by an embodiment of the present disclosure; Figure 3 is a second partial top view schematic diagram of a photovoltaic module provided by an embodiment of the present disclosure; Figure 4 is a third partial top view schematic diagram of a photovoltaic module provided by an embodiment of the present disclosure; Figure 5 is a fourth partial top view schematic diagram of a photovoltaic module provided by an embodiment of the present disclosure. In addition, to clearly show the first fixing bar 132 and the second fixing bar 142, Figures 2 to 5 the welding tape 101 is drawn in a perspective manner in both.

[0043] It is worth noting that for a single fixing part 102, whether the fixing part 102 includes both the first sub-part 112 and the second sub-part 122, or only includes one of the first sub-part 112 and the second sub-part 122, designing that the first sub-part 112 includes at least two first fixing bars 132 arranged at intervals along the second direction Z, and the second sub-part 122 includes at least two second fixing bars 142 arranged at intervals along the second direction Z, is beneficial to making the fixing part 102 for fixing the welding tape 101 have at least two spaced contact surfaces with the welding tape 101, so as to add multiple guarantees to the fixing effect of the welding tape 101, thereby being beneficial to ensuring a good fixing effect of the fixing part 102 on the welding tape 101.

[0044] In addition, the first sub - part 112 of the design includes at least two first fixing bars 132 arranged at intervals, and the second sub - part 122 includes at least two second fixing bars 142 arranged at intervals. On the one hand, gaps are partitioned inside the fixing part 102, which is beneficial to reducing the influence of the optical blockage caused by the fixing part 102 on the battery cell 100 and reducing the amount of materials required for preparing the fixing part 102, so as to reduce the manufacturing cost of the photovoltaic module. On the other hand, compared with the volume of the fixing part 102, due to the smaller volumes of the first fixing bar 132 and the second fixing bar 142, even if the first fixing bar 132 or the second fixing bar 142 has an epitaxial phenomenon due to fluidity, the degree of epitaxy is extremely small, and the gaps between adjacent first fixing bars 132 reserve position spaces for the epitaxy of the first fixing bar 132, and the gaps between adjacent second fixing bars 142 reserve position spaces for the epitaxy of the second fixing bar 142. Thus, it can effectively prevent epitaxy from reaching the area where the welding strip 101 is in electrical contact with the battery cell 100, effectively reducing the risk that the fixing part 102 has glue overflow, resulting in poor contact between the welding strip 101 and the battery cell 100, and avoiding the risk of false soldering.

[0045] Moreover, in an embodiment of the present disclosure, the fixing of the welding strip 101 is realized by means of the fixing part 102. Since the electrical contact between the welding strip 101 and the battery cell 100 can be achieved by using a low - temperature process, the deformation problem of the battery cell caused by high - temperature welding can be effectively avoided, and it is also beneficial to reducing the high - temperature welding process of the welding strip, thus simplifying the manufacturing process of the photovoltaic module and improving the yield of the photovoltaic module.

[0046] It should be noted that for any fixing part 102, the fixing part 102 can include the first sub - part 112 and / or the second sub - part 122. Based on this, for any battery cell 100, the fixing part 102 including the first sub - part 112 and / or the second sub - part 122 includes at least the following situations: In some situations, referring to Figure 1 、 Figure 2 or Figure 3 , each fixing part 102 includes a first sub - part 112 and a second sub - part 122; in other situations, referring to Figure 4 or Figure 5 , a partial number of fixing parts 102 only include the first sub - part 112, and the remaining number of fixing parts 102 only include the second sub - part 122; in other situations, it can also be that a partial number of fixing parts simultaneously include a first sub - part and a second sub - part, and the remaining number of fixing parts only include the first sub - part or only include the second sub - part. The specific structure of the fixing parts 102 provided on a battery cell 100 will be described in detail later.

[0047] It should be noted that the first side portion 111 and the second side portion 121 opposite to each other in the second direction Z of the solder ribbon 101 can be regarded as the left and right sides of the solder ribbon 101, and the first sub-portion 112 and the second sub-portion 122 can be regarded as single-sided components located on the left and right sides of the solder ribbon 101 respectively. The first fixing strip 132 and the second fixing strip 142 can both be regarded as partitioned components included in the single-sided components.

[0048] The following provides a detailed description of a photovoltaic module provided by an embodiment of the present disclosure.

[0049] In some embodiments, the cell 100 can be a PERC cell (Passivated Emitter Rear Cell), an IBC cell (Interdigitated Back Contact), a TOPCon cell (Tunnel Oxide Passivated Contact), a HIT / HJT cell (Heterojunction Technology), a thin-film solar cell, or a tandem cell. In other words, the layout between the solder ribbon 101 and the fixing portion 102 in the photovoltaic module provided by an embodiment of the present disclosure is applicable to both IBC cells with electrodes on one side and double-sided cells with electrodes on both sides.

[0050] Among them, the thin-film solar cell includes but is not limited to perovskite thin-film solar cells, copper indium selenide thin-film solar cells, gallium arsenide thin-film solar cells, and cadmium sulfide thin-film solar cells. The tandem cell includes but is not limited to perovskite cells stacked with crystalline silicon cells, perovskite cells stacked with perovskite cells, and perovskite cells stacked with thin-film cells.

[0051] The cell 100 can be a monocrystalline silicon solar cell, a polycrystalline silicon solar cell, an amorphous silicon solar cell, or a multi-component compound solar cell. The multi-component compound solar cell can specifically be a cadmium sulfide solar cell, a gallium arsenide solar cell, a copper indium selenide solar cell, or a perovskite solar cell. In addition, the cell 100 can be a whole cell or a sliced cell, and the sliced cell refers to a cell formed by cutting a complete whole cell through a cutting process.

[0052] In some embodiments, referring to Figure 3 or Figure 5 , the cell 100 can include: a substrate (not labeled in the figure); a main grid 103 located on the substrate; and a plurality of pads 104 arranged at intervals, the pads 104 are in contact connection with the main grid 103, and both ends of the main grid 103 opposite to each other in the first direction Y are respectively in contact connection with a pad 104. In other words, Figure 3 and Figure 5Taking the cell 100 with main grid lines as an example of an IBC cell, in practical applications, the cell can also be an IBC cell without main grid lines.

[0053] It should be noted that when using a high-temperature welding process and the cell is an IBC cell, since both the positive fine grid lines and the negative fine grid lines are arranged in an interleaved manner on the back of the IBC cell, the IBC cell is single-sided welded. Due to the mismatch in the coefficient of thermal expansion between the solder tape and the IBC cell, there will be greater stress between the solder tape and the IBC cell after welding and it cannot be released, resulting in the warping of the cell tending to become more serious, further increasing the risk of cell microcracks during the subsequent lamination process. Based on this, in an embodiment of the present disclosure, the fixing of the solder tape 101 is achieved by means of the fixing portion 102, and the electrical contact between the solder tape 101 and the cell 100 can be realized by using a low-temperature process, so that the serious deformation problem of the IBC cell caused by high-temperature welding can be effectively avoided, the risk of warping of the IBC cell can be significantly reduced, and the yield of the photovoltaic module can be improved. The design in which the fixing portion 102 includes the first sub-portion 112 and / or the second sub-portion 122 will be described in detail below.

[0054] In some embodiments, referring to Figures 1 to 3 , any fixing portion 102 includes a first sub-portion 112 and a second sub-portion 122 that are spaced apart along the second direction Z. In other words, any fixing portion 102 fixes the first side portion 111 of the solder tape 101 by means of the first sub-portion 112 and fixes the second side portion 121 of the solder tape 101 by means of the second sub-portion 122. In this way, a single fixing portion 102 will fix the opposite sides of the solder tape 101 along the second direction Z, so as to further improve the fixing effect of the single fixing portion 102 on the solder tape 101, which is beneficial to reducing the number of fixing portions 102 required to be correspondingly arranged for the solder tape 101 per unit length along the first direction Y.

[0055] In some cases, continuing to refer to Figures 1 to 3 , the fixing portion 102 has a center line extending along the first direction Y, and the first sub-portion 112 and the second sub-portion 122 are axisymmetric with respect to the center line. Based on this, in the same fixing portion 102, the number of the first fixing bars 132 included in the first sub-portion 112 is the same as the number of the second fixing bars 142 included in the second sub-portion 122, and, along the second direction Z, the widths of the first fixing bars 132 and the second fixing bars 142 also have a corresponding relationship. In this way, it is beneficial to make the fixing effects of the first sub-portion 112 and the second sub-portion 122 on the solder tape 101 in the same fixing portion 102 as consistent as possible, so as to improve the force uniformity of the solder tape 101.

[0056] In other cases, in the same fixing part, the number of first fixing bars included in the first sub - part may also be different from the number of second fixing bars included in the second sub - part, and / or, along the second direction, the width of the first fixing bar and the width of the second fixing bar may also be different. In other words, both the number of first fixing bars included in the first sub - part and the width of the first fixing bar in the second direction can be flexibly changed according to the connection requirements between the solder tape and the fixing part, and both the number of second fixing bars included in the second sub - part and the width of the second fixing bar in the second direction can also be flexibly changed according to the connection requirements between the solder tape and the fixing part.

[0057] In some other embodiments, referring to Figure 4 and Figure 5 , along the first direction Y, one of two adjacent and spaced - apart fixing parts 102 includes a first sub - part 112, and the other includes a second sub - part 122. In other words, different regions of the same solder tape 101 along the first direction Y are respectively connected by the first sub - part 112 and the second sub - part 122.

[0058] In some cases, continuing to refer to Figure 4 and Figure 5 , for any fixing part 102, the fixing part 102 is either the first sub - part 112 or the second sub - part 122. Moreover, along the first direction Y, one of two adjacent and spaced - apart fixing parts 102 is the first sub - part 112, and the other is the second sub - part 122. In other words, among the multiple fixing parts 102 connected to the same solder tape 101, adjacent fixing parts 102 are not only spaced apart along the first direction Y, but also misaligned along the second direction Z. It can be understood that adjacent fixing parts 102 connected to the same solder tape 101 are neither directly opposite along the first direction Y nor directly opposite along the second direction Z, which is beneficial to further reducing the risk that the fixing part 102 extends to the region where the solder tape 101 is in electrical contact with the battery cell 100 due to its fluidity.

[0059] In some embodiments, with reference to Figure 6 or Figure 7 , at least one of the first fixing bar 132 and the second fixing bar 142 may include an outer peripheral part 152 and a central part 162 wrapped by the outer peripheral part 152, and the outer peripheral part 152 at least surrounds the side wall of the central part 162; the viscosity of the outer peripheral part 152 is greater than the viscosity of the central part 162, and the adhesion of the outer peripheral part 152 is less than or equal to the adhesion of the central part 162. Among them, Figure 6 is a partial cross - sectional view of the first fixing bar in a photovoltaic module provided by an embodiment of the present disclosure; Figure 7 is a partial cross - sectional view of the second fixing bar in a photovoltaic module provided by an embodiment of the present disclosure.

[0060] In some examples, referring to Figure 6 ,Figure 6 Taking the example that the first fixing strip 132 includes an outer peripheral part 152 and a central part 162, and the outer peripheral part 152 only surrounds the side wall of the central part 162, that is, the outer peripheral part 152 encloses a through hole, and the central part 162 fills the through hole; in some other examples, refer to Figure 7 , Figure 6 Taking the example that the second fixing strip 142 includes an outer peripheral part 152 and a central part 162, and the outer peripheral part 152 not only surrounds the side wall of the central part 162, but also is located between the central part 162 and the solar cell 100, that is, the outer peripheral part 152 encloses a blind hole, and the central part 162 fills the blind hole. It should be noted that the specific structure of either the first fixing strip 132 or the second fixing strip 142 can be as Figure 6 or as Figure 7 shown.

[0061] It should be noted that generally, the greater the viscosity of a material, the poorer its fluidity, the faster its curing speed, and the lower the degree of glue overflow. However, its wettability is weak, and the bonding force will also be weakened to some extent. Based on this, designing the outer peripheral part 152 with a higher viscosity to at least surround the side wall of the central part 162 is beneficial to avoid the extension of the central part 162 with a lower viscosity by means of the blocking effect of the outer peripheral part 152 with a faster curing speed. Even if the fluidity of the central part 162 is poor, the central part 162 can be wrapped in the middle by the outer peripheral part 152 as an envelope layer, so as to effectively avoid the glue overflow phenomenon of the first fixing strip 132 or the second fixing strip 142, so as to effectively avoid the poor contact between the welding strip 101 and the solar cell 100 caused by the glue overflow phenomenon, thereby further improving the yield of the photovoltaic module. In addition, while ensuring that the outer peripheral part 152 has a strong enough blocking ability for the central part 162, designing the central part 162 to have a greater bonding force is beneficial to further improve the connection strength between the first fixing strip 132 or the second fixing strip 142 and the welding strip 101 by means of the better wettability of the central part 162. In addition, designing the outer peripheral part 152 to at least surround the side wall of the central part 162 is beneficial to avoid the increase in the size of the first fixing strip 132 or the second fixing strip 142 with a multi-material combination in the thickness direction X, so as to avoid too large a height difference between the welding strip 101 and the solar cell 100 caused by the first fixing strip 132 or the second fixing strip 142, so as to avoid the poor contact between the welding strip 101 and the solar cell 100.

[0062] It should be noted that for the clarity of the illustration, Figures 1 to 5Only the first fixing strip 132 and the second fixing strip 142 are schematically shown, and the peripheral part and the central part are not schematically shown. In actual application, on the same solar cell 100, any first fixing strip 132 can be designed to include a peripheral part 152 and a central part 162, and any second fixing strip 142 can also be designed to include a peripheral part 152 and a central part 162. According to the connection requirements between the welding tape and the fixing part, the position and quantity of the first fixing strip 132 including the peripheral part 152 and the central part 162 on the solar cell 100 can be flexibly adjusted, and the position and quantity of the second fixing strip 142 including the peripheral part 152 and the central part 162 on the solar cell 100 can be flexibly adjusted.

[0063] In some cases, referring to Figure 6 or Figure 7 , the viscosity of the peripheral part 152 can be 15000 Pa·s to 25000 Pa·s, and the viscosity of the central part 162 can be 6000 mPa·s to 10000 mPa·s.

[0064] In some examples, the viscosity of the peripheral part 152 can be 15500 Pa·s, 16000 Pa·s, 16500 Pa·s, 17000 Pa·s, 17500 Pa·s, 18000 Pa·s, 18500 Pa·s, 19000 Pa·s, 19500 Pa·s, 20000 Pa·s, 20500 Pa·s, 21000 Pa·s, 21500 Pa·s, 22000 Pa·s, 22500 Pa·s, 23000 Pa·s, 23500 Pa·s, 24000 Pa·s or 25500 Pa·s, etc.; the viscosity of the central part 162 can be 6500 Pa·s, 7000 Pa·s, 7500 Pa·s, 8000 Pa·s, 8500 Pa·s, 9000 Pa·s, or 9500 Pa·s, etc.

[0065] In some cases, referring to Figure 6 or Figure 7 , the material of the peripheral part 152 can be any one of conductive adhesive or the first insulating adhesive, and the material of the central part 162 can be the second insulating adhesive.

[0066] It should be noted that, compared with conductive adhesive, the first insulating adhesive and the second insulating adhesive have lower costs and better wettability. The material of the peripheral part 152 is designed as the first insulating adhesive, which is conducive to improving the connection strength between the peripheral part 152 and the welding strip 101 by means of the first insulating adhesive with better wettability, and is also conducive to further reducing the preparation cost of the peripheral part 152. In addition, when the material of the peripheral part 152 is designed as conductive adhesive, due to the conductivity of the conductive adhesive, even if the peripheral part 152 extends to the area where the welding strip 101 is in electrical contact with the battery cell 100 based on its own fluidity, the welding strip 101 and the battery cell 100 will still be in electrical contact, which is conducive to ensuring good electrical connection between the welding strip 101 and the battery cell 100. Moreover, the material of the central part 162 is still the second insulating adhesive, which is conducive to reducing the average preparation cost of the first fixing strip 132 or the second fixing strip 142.

[0067] In some examples, the first insulating adhesive and the second insulating adhesive may be formed of the same insulating material.

[0068] The number of the first fixing strips 132 included in the first sub - part 112 and the number of the second fixing strips 142 included in the second sub - part 122 will be described in detail below.

[0069] In some embodiments, referring to Figure 8 , Figure 8 FIG. is the fifth partial top - view schematic diagram of a photovoltaic module provided by an embodiment of the present disclosure. The battery cell 100 may include two edge regions 130 opposite to each other along the first direction Y, and a central region 140 between the two edge regions 130. The number of the first fixing strips 132 included in the first sub - part 112 located in the edge region 130 is the first number, and the number of the first fixing strips 132 included in the first sub - part 112 located in the central region 140 is the second number, and the first number is greater than the second number.

[0070] It should be noted that, during the process of electrically connecting multiple battery cells 100 by means of the welding strip 101, the stress on the edge region 130 of the battery cell 100 is greater than the stress on the central region 140, resulting in that the part of the welding strip 101 located on the edge region 130 is more likely to be deformed by force and even fall off from the battery cell 100. Based on this, compared with the number of the first fixing strips 132 included in the first sub - part 112 located in the central region 140, designing the number of the first fixing strips 132 included in the first sub - part 112 located in the edge region 130 to be more is conducive to increasing the number of contact points between the first sub - part 112 located in the edge region 130 and the welding strip 101, thereby being conducive to improving the connection strength between the first sub - part 112 located in the edge region 130 and the welding strip 101, so as to further reduce the probability of the welding strip 101 being deformed by force and the probability of the welding strip 101 falling off from the battery cell 100.

[0071] It should be noted that Figure 8Only the first number is 3 and the second number is 2 are taken as examples. In actual applications, the specific values of the first number and the second number are not restricted.

[0072] In some cases, the ratio of the first number to the second number can be 1.2 to 1.3. For example, it can be 1.21, 1.22, 1.23, 1.24, 1.25, 1.26, 1.27, 1.28 or 1.29, etc. In this way, the difference between the first number and the second number will not be too large, which is beneficial to avoiding excessive optical shielding of the battery cell 100 by the first sub - part 112 located in the edge area 130, and is also beneficial to ensuring a stronger fixing effect on the part of the welding tape 101 located in the edge area 130.

[0073] In some embodiments, continue to refer to Figure 8 , the number of the second fixing bars 142 included in the second sub - part 122 located in the edge area 130 is the third number, and the number of the second fixing bars 142 included in the second sub - part 122 located in the central area 140 is the fourth number, and the third number is greater than the fourth number. In this way, designing that the number of the second fixing bars 142 included in the second sub - part 122 located in the edge area 130 is more is beneficial to increasing the number of contact points between the second sub - part 122 located in the edge area 130 and the welding tape 101, thereby being beneficial to enhancing the connection strength between the second sub - part 122 located in the edge area 130 and the welding tape 101, to further reduce the probability of the welding tape 101 deforming under force and the probability of the welding tape 101 falling off from the battery cell 100.

[0074] It should be noted that Figure 8 Only the third number is 3 and the fourth number is 2 are taken as examples. In actual applications, the specific values of the third number and the fourth number are not restricted.

[0075] In some cases, the ratio of the third number to the fourth number can be 1.2 to 1.3. For example, it can be 1.21, 1.22, 1.23, 1.24, 1.25, 1.26, 1.27, 1.28 or 1.29, etc. In this way, the difference between the third number and the fourth number will not be too large, which is beneficial to avoiding excessive optical shielding of the battery cell 100 by the second sub - part 122 located in the edge area 130, and is also beneficial to ensuring a stronger fixing effect on the part of the welding tape 101 located in the edge area 130.

[0076] It should be noted that Figure 8 Taking the first number being greater than the second number and the third number being greater than the fourth number existing simultaneously on the same battery cell 100 as an example. In actual applications, for two adjacent electrically - connected battery cells, based on different requirements for welding - tape connection, it can be flexibly selected on any battery cell 100 whether to only design the first number greater than the second number or only design the third number greater than the fourth number.

[0077] The orthographic projection area of the first fixing strip 132 on the first surface 110 and the orthographic projection area of the second fixing strip 142 on the first surface 110 will be described in detail below.

[0078] In some embodiments, referring to Figure 9 , Figure 9 FIG. is a sixth partial top view schematic diagram of a photovoltaic module provided by an embodiment of the present disclosure. The cell 100 may include two edge regions 130 opposite to each other in the first direction Y, and a central region 140 between the two edge regions 130; the orthographic projection area of the first fixing strip 132 located in the edge region 130 on the first surface 110 is the first area, and the orthographic projection area of the first fixing strip 132 located in the central region 140 on the first surface 110 is the second area, and the first area is greater than the second area. In this way, designing the orthographic projection area of the first fixing strip 132 located in the edge region 130 on the first surface 110 to be larger is beneficial to increasing the contact area between the first fixing strip 132 located in the edge region 130 and the solder ribbon 101, thereby being beneficial to improving the connection strength between the first fixing strip 132 located in the edge region 130 and the solder ribbon 101, so as to further reduce the probability of the solder ribbon 101 being deformed by force and the probability of the solder ribbon 101 falling off from the cell 100.

[0079] It should be noted that, compared with the orthographic projection area of the first fixing strip 132 located in the central region 140 on the first surface 110, the orthographic projection area of the first fixing strip 132 located in the edge region 130 on the first surface 110 is larger, which can be achieved by adjusting at least one of the length of the first fixing strip 132 in the first direction Y or the width in the second direction Z.

[0080] In some cases, the ratio of the first area to the second area may be 1.2 to 1.3. For example, it may be 1.21, 1.22, 1.23, 1.24, 1.25, 1.26, 1.27, 1.28 or 1.29, etc. In this way, the difference between the first area and the second area is not too large, which is beneficial to avoiding excessive optical shielding of the cell 100 by the first fixing strip 132 located in the edge region 130, and is also beneficial to ensuring a stronger fixing effect on the part of the solder ribbon 101 located in the edge region 130.

[0081] In some embodiments, continue to refer to Figure 9, the orthographic projection area of the second fixing strip 142 located in the edge area 130 on the first surface 110 is the third area, and the orthographic projection area of the second fixing strip 142 located in the central area 140 on the first surface 110 is the fourth area, and the third area is larger than the fourth area. In this way, designing the orthographic projection area of the second fixing strip 142 located in the edge area 130 on the first surface 110 to be larger is beneficial to increasing the contact area between the second fixing strip 142 located in the edge area 130 and the welding strip 101, thereby being beneficial to improving the connection strength between the second fixing strip 142 located in the edge area 130 and the welding strip 101, so as to further reduce the probability of the welding strip 101 being deformed by force and the probability of the welding strip 101 falling off the battery cell 100.

[0082] It should be noted that, compared with the orthographic projection area of the second fixing strip 142 located in the central area 140 on the first surface 110, the orthographic projection area of the second fixing strip 142 located in the edge area 130 on the first surface 110 is larger, which can be achieved by adjusting at least one of the length of the second fixing strip 142 in the first direction Y or the width in the second direction Z.

[0083] In some cases, the ratio of the third area to the fourth area can be 1.2 to 1.3. In this way, the difference between the third area and the fourth area is not too large, which is beneficial to avoiding excessive optical shielding of the battery cell 100 by the first fixing strip 132 located in the edge area 130, and is also beneficial to ensuring a stronger fixing effect for the part of the welding strip 101 located in the edge area 130.

[0084] It should be noted that Figure 9 taking the coexistence of the first area being larger than the second area and the third area being larger than the fourth area on the same battery cell 100 as an example, in actual applications, for two adjacent electrically connected battery cells, based on different requirements for welding strip connection, either battery cell 100 can be flexibly selected, whether to only design the first area to be larger than the second area or only design the third area to be larger than the fourth area.

[0085] In some embodiments, referring to Figures 1 to 5 , Figure 8 and Figure 9 , the connection force generated by the first sub - part 112 as a whole on the welding strip 101 is not less than 1 N; and / or, the connection force generated by the second sub - part 122 as a whole on the welding strip 101 is not less than 1 N.

[0086] It should be noted that through experimental verification, the overall connecting force exerted by the first sub - part 112 designed in an embodiment of the present disclosure on the welding tape 101 is not less than 1 N, which can ensure that the welding tape 101 can be effectively fixed by means of the first sub - part 112, so as to reduce the probability of the welding tape 101 deforming under force and the probability of the welding tape 101 falling off from the battery cell 100; the overall connecting force exerted by the second sub - part 122 designed in an embodiment of the present disclosure on the welding tape 101 is not less than 1 N, which can also ensure that the welding tape 101 can be effectively fixed by means of the second sub - part 122, so as to reduce the probability of the welding tape 101 deforming under force and the probability of the welding tape 101 falling off from the battery cell 100.

[0087] In some embodiments, with reference to Figures 1 to 5 、 Figure 8 and Figure 9 , along the second direction Z, the widths of different first fixing bars 132 included in the same first sub - part 112 may be the same or different; and / or, along the second direction Z, the widths of different second fixing bars 142 included in the same second sub - part 122 may be the same or different. It should be noted that Figures 1 to 8 only takes the widths of different first fixing bars 132 included in the same first sub - part 112 as being the same and the widths of different second fixing bars 142 included in the same second sub - part 122 as being the same as an example. In actual applications, according to the actual requirements for connecting the welding tape 101, the widths of different first fixing bars 132 in the same first sub - part 112 can be designed respectively, and the widths of different second fixing bars 142 in the same second sub - part 122 can be designed respectively.

[0088] In some embodiments, with reference to Figures 1 to 5 、 Figure 8 and Figure 9 , along the second direction Z, the ratio of the width of the first fixing bar 132 to the width of the first sub - part 112 may be 0.2 - 0.45. For example, it may be 0.22, 0.23, 0.25, 0.26, 0.28, 0.3, 0.32, 0.34, 0.35, 0.36, 0.38, 0.4, 0.42 or 0.43, etc. In this way, it is beneficial to control the number of first fixing bars 132 included in the first sub - part 112 to be moderate, so as to ensure that there are a moderate number of contact points and a moderate contact area between the first sub - part 112 and the welding tape 101, thereby being beneficial to ensuring a good fixing effect of the first sub - part 112 on the welding tape 101 while avoiding excessive optical blocking of the first sub - part 112 to the battery cell 100.

[0089] In some embodiments, with reference to Figures 1 to 5 、 Figure 8 and Figure 9, in the second direction Z, the ratio of the width of the second fixing strip 142 to the width of the second sub - part 122 can be 0.2 to 0.45. For example, it can be 0.22, 0.23, 0.25, 0.26, 0.28, 0.3, 0.32, 0.34, 0.35, 0.36, 0.38, 0.4, 0.42 or 0.43, etc. In this way, it is beneficial to control the appropriate number of the second fixing strips 142 included in the second sub - part 122, so as to ensure an appropriate number of contact points and an appropriate contact area between the second sub - part 122 and the welding strip 101. Thus, while ensuring a good fixing effect of the second sub - part 122 on the welding strip 101, it is possible to avoid excessive optical blockage of the second sub - part 122 to the battery cell 100.

[0090] In some examples, in the second direction Z, the width of at least one of the first sub - part 112 or the second sub - part 122 can be 0.8 mm to 1.5 mm. For example, it can be 0.85 mm, 0.9 mm, 0.95 mm, 1.0 mm, 1.05 mm, 1.1 mm, 1.15 mm, 1.2 mm, 1.25 mm, 1.3 mm, 1.35 mm, 1.4 mm or 1.45 mm, etc.; the width of at least one of the first fixing strip 132 or the second fixing strip 142 can be 0.3 mm to 0.5 mm. For example, it can be 0.31 mm, 0.32 mm, 0.33 mm, 0.34 mm, 0.35 mm, 0.36 mm, 0.37 mm, 0.38 mm, 0.39 mm, 0.4 mm, 0.41 mm, 0.42 mm, 0.43 mm, 0.44 mm, 0.45 mm, 0.46 mm, 0.47 mm, 0.48 mm or 0.49 mm, etc.

[0091] In some embodiments, referring to Figures 1 to 5 , Figure 8 and Figure 9 , in the second direction Z, the ratio of the spacing between adjacent first fixing strips 132 to the width of the first fixing strip 132 can be 0.2 to 0.7. For example, it can be 0.23, 0.25, 0.28, 0.3, 0.32, 0.35, 0.36, 0.4, 0.43, 0.45, 0.48, 0.5, 0.53, 0.55, 0.58, 0.6, 0.63, 0.65 or 0.68, etc. In this way, it is beneficial to ensure a sufficient connection area between the welding strip 101 and the first sub - part 112, while increasing the light that the battery cell 100 can receive by means of the spacing between adjacent first fixing strips 132.

[0092] In some embodiments, referring to Figures 1 to 5 , Figure 8 and Figure 9, in the second direction Z, the ratio of the distance between adjacent second fixing bars 142 to the width of the second fixing bar 142 can be 0.2 to 0.7. For example, it can be 0.23, 0.25, 0.28, 0.3, 0.32, 0.35, 0.36, 0.4, 0.43, 0.45, 0.48, 0.5, 0.53, 0.55, 0.58, 0.6, 0.63, 0.65 or 0.68, etc. In this way, it is beneficial to increase the light received by the battery cell 100 by means of the distance between adjacent second fixing bars 142 while ensuring a sufficient connection area between the welding tape 101 and the second sub - part 122.

[0093] In some examples, in the second direction Z, at least one of the distance between adjacent first fixing bars 132 and the distance between adjacent second fixing bars 142 can be 0.1 mm to 0.2 mm. For example, it can be 0.11 mm, 0.12 mm, 0.13 mm, 0.14 mm, 0.15 mm, 0.16 mm, 0.17 mm, 0.18 mm or 0.19 mm, etc.

[0094] In some embodiments, referring to Figures 1 to 5 , Figure 8 and Figure 9 , in the second direction Z, the width of the welding tape 101 can be 0.6 mm to 1.8 mm. For example, it can be 0.65 mm, 0.7 mm, 0.75 mm, 0.8 mm, 0.85 mm, 0.9 mm, 0.95 mm, 1.0 mm, 1.05 mm, 1.1 mm, 1.15 mm, 1.2 mm, 1.25 mm, 1.3 mm, 1.35 mm, 1.4 mm, 1.45 mm, 1.5 mm, 1.55 mm, 1.6 mm, 1.65 mm, 1.7 mm or 1.75 mm, etc.

[0095] In summary, the design of the first sub - part 112 includes at least two first fixing strips 132 arranged at intervals along the second direction Z, and the second sub - part 122 includes at least two second fixing strips 142 arranged at intervals along the second direction Z. This is beneficial to making there be at least two spaced contact surfaces between the fixing part 102 for fixing the welding tape 101 and the welding tape 101, so as to provide multiple guarantees for the fixing effect of the welding tape 101, and thus is beneficial to ensuring a good fixing effect of the fixing part 102 on the welding tape 101. In addition, on the one hand, making gaps be divided inside the fixing part 102 is beneficial to reducing the influence of the optical blockage caused by the fixing part 102 on the battery cell 100, and reducing the amount of materials required for preparing the fixing part 102, so as to reduce the manufacturing cost of the photovoltaic module; on the other hand, compared with the volume of the fixing part 102, based on the smaller volumes of the first fixing strip 132 and the second fixing strip 142, even if the first fixing strip 132 or the second fixing strip 142 has an epitaxial phenomenon due to fluidity, the degree of epitaxy is extremely small, and the gap between adjacent first fixing strips 132 reserves a position space for the epitaxy of the first fixing strip 132, and the gap between adjacent second fixing strips 142 reserves a position space for the epitaxy of the second fixing strip 142. Thus, it can effectively avoid epitaxy to the area where the welding tape 101 is in electrical contact with the battery cell 100, so as to effectively reduce the risk that the fixing part 102 has glue overflow and causes poor contact between the welding tape 101 and the battery cell 100, and avoid the risk of virtual soldering.

[0096] Those of ordinary skill in the art can understand that the above - mentioned embodiments are specific examples for implementing the present disclosure. In actual applications, various changes can be made in form and details without departing from the spirit and scope of the embodiments of the present disclosure. Any person skilled in the art can make various changes and modifications without departing from the spirit and scope of the embodiments of the present disclosure. Therefore, the protection scope of the embodiments of the present disclosure should be subject to the scope defined by the claims.

Claims

1. A photovoltaic module, characterized in that: include: The battery sheet has a first surface and a second surface opposite to each other in a thickness direction; A plurality of welding strips extending along the first direction are arranged at intervals along the second direction, and the welding strips are located on at least one of the first surface and the second surface; A plurality of fixing portions located on at least one of the first surface and the second surface, wherein the same welding strip is connected to at least two of the fixing portions spaced apart along the first direction; Wherein, the welding strip has a first side portion and a second side portion opposite to each other along the second direction, the fixing portion includes a first sub-portion and / or a second sub-portion, the first sub-portion is connected to the first side portion, the second sub-portion is connected to the second side portion, and the first sub-portion includes at least two first fixing strips arranged at intervals along the second direction, and the second sub-portion includes at least two second fixing strips arranged at intervals along the second direction.

2. The photovoltaic module according to claim 1, characterized in that: Any of the fixing portions includes the first sub-portions and the second sub-portions which are arranged at intervals along the second direction.

3. The photovoltaic module according to claim 1, characterized in that: Along the first direction, one of two adjacent fixed portions arranged at intervals includes the first sub-portion, and the other includes the second sub-portion.

4. The photovoltaic module according to claim 1, characterized in that: At least one of the first fixing strip and the second fixing strip comprises an outer portion and a central portion wrapped by the outer portion, wherein the outer portion at least surrounds a side wall of the central portion; The viscosity of the outer portion is greater than the viscosity of the central portion, and the adhesive force of the outer portion is less than or equal to the adhesive force of the central portion.

5. The photovoltaic module according to claim 4, characterized in that: The material of the outer portion may be any one of a conductive glue and a first insulating glue, and the material of the central portion may be a second insulating glue.

6. The photovoltaic module according to claim 1, characterized in that: The battery cell comprises two edge regions opposite to each other along the first direction, and a central region between the two edge regions; The first sub-portion located in the edge area includes a first number of first fixing strips, the first sub-portion located in the central area includes a second number of first fixing strips, and the first number is greater than the second number; and / or, The second sub-portion located in the edge area includes a third number of second fixing strips, and the second sub-portion located in the center area includes a fourth number of second fixing strips, and the third number is greater than the fourth number.

7. The photovoltaic module according to claim 6, characterized in that: The ratio of the first number to the second number is 1.2 to 1.3; and / or the ratio of the third number to the fourth number is 1.2 to 1.

3.

8. The photovoltaic module according to claim 1, characterized in that: The battery cell comprises two edge regions opposite to each other along the first direction, and a central region between the two edge regions; The orthographic projection area of ​​the first fixing strip located in the edge area on the first surface is a first area, and the orthographic projection area of ​​the first fixing strip located in the center area on the first surface is a second area, and the first area is larger than the second area; and / or, The orthographic projection area of ​​the second fixing strip located in the edge area on the first surface is a third area, and the orthographic projection area of ​​the second fixing strip located in the center area on the first surface is a fourth area, and the third area is greater than the fourth area.

9. The photovoltaic module according to claim 8, characterized in that: The ratio of the first area to the second area is 1.2 to 1.3; and / or the ratio of the third area to the fourth area is 1.2 to 1.

3.

10. The photovoltaic module according to any one of claims 1 to 9, characterized in that: The first sub-portion as a whole generates a connection force on the soldering strip of no less than 1N; and / or the second sub-portion as a whole generates a connection force on the soldering strip of no less than 1N.

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