Photovoltaic module

Abstract

The invention provides a photovoltaic module, and relates to the field of photovoltaic technology, the photovoltaic module comprises a battery string, a bus bar and a conductive member, the battery string comprises a battery piece and a lead-out solder strip, the lead-out solder strip is electrically connected with the battery piece, the lead-out solder strip comprises a lead-out part extending out of the battery piece, and a part of the bus bar is located at the backlight side of the battery piece. The bus bar is electrically connected with the leading-out part, and the conductive piece is located on the side, away from the bus bar, of the leading-out part and electrically connected with the leading-out part. The arrangement of the conductive member increases the area of a current conduction path, thereby reducing the resistance, improving the power of the photovoltaic module, enhancing the stripping resistance and impact resistance of the leading-out solder strip, increasing the welding tension of the leading-out solder strip, improving the mechanical performance of the photovoltaic module, improving the reliability of the photovoltaic module, and prolonging the service life of the photovoltaic module.

Description

Technical Field

[0001] This application relates to the field of photovoltaic technology, and more specifically to a photovoltaic module. Background Technology

[0002] Photovoltaic modules are used to convert solar energy into electrical energy. The solder ribbons in photovoltaic modules are used to realize the electrical connection between the cells. Currently, the reliability of the connection between the solder ribbons and the busbars is low, which affects the performance and service life of photovoltaic modules. Summary of the Invention

[0003] In view of this, this application provides a photovoltaic module to help solve the problem of low reliability of the connection between the solder strip and the busbar in the prior art.

[0004] This application provides a photovoltaic module, including a battery string, a busbar, and a conductive element. The battery string includes battery cells and lead-out solder strips. The lead-out solder strips are electrically connected to the battery cells and include lead-out portions extending out of the battery cells. A portion of the busbar structure is located on the backlight side of the battery cells, and the busbar is electrically connected to the lead-out portions. The conductive element is located on the side of the lead-out portions away from the busbar and is electrically connected to the lead-out portions.

[0005] In some possible implementations, the lead-out portion is welded to the conductive element, and a first weld joint is formed between the lead-out portion and the conductive element. The lead-out portion is also welded to the busbar, and a second weld joint is formed between the lead-out portion and the busbar. The area of ​​the first weld joint is greater than or equal to the area of ​​the second weld joint.

[0006] In some possible implementations, the lead-out solder strip includes a first substrate and a first solder layer covering the first substrate, the conductive element includes a second substrate and a second solder layer covering the second substrate, the busbar includes a third substrate and a third solder layer covering the third substrate, the first solder layer is welded to the second solder layer to form a first solder joint, and the first solder layer is welded to the third solder layer to form a second solder joint.

[0007] In some possible implementations, the busbar and the conductive element extend along a first direction, the length of the conductive element along the first direction is equal to or less than the length of the busbar along the first direction, at least two battery strings are arranged along the first direction, and the leads of at least two battery strings are electrically connected to the busbar and the conductive element.

[0008] In some possible implementations, the cross-sectional area S of the conductive element along the thickness direction of the photovoltaic module satisfies: 1mm²≤S≤3mm².

[0009] In some possible implementations, the height H1 of the conductive element along the thickness direction of the photovoltaic module satisfies: 0.1mm≤H1≤1.1mm, and / or the width W1 of the conductive element along the second direction satisfies: 1.5mm≤W1≤2.5mm.

[0010] In some possible implementations, the lead-out portion is recessed toward one side of the busbar to form a receiving space, at least a portion of the structure of the conductive element is housed within the receiving space, and the conductive element is electrically connected to the inner wall of the receiving space.

[0011] In some possible implementations, the lead-out solder strip further includes a body portion located on the solar cell, the body portion being electrically connected to the solar cell, the lead-out portion being located on one side of the body portion and electrically connected to the body portion, and the height of the lead-out portion along the thickness direction of the photovoltaic module being greater than the height of the body portion along the thickness direction of the photovoltaic module.

[0012] In some possible implementations, the busbar includes a first connecting portion and a second connecting portion, the first connecting portion being electrically connected to the second connecting portion, the first connecting portion being located on the backlight side of the solar cell, a buffer being disposed between the first connecting portion and the solar cell, the second connecting portion being located on the side of the lead-out portion away from the conductive element and being electrically connected to the lead-out portion, the second connecting portion extending towards the conductive element along the thickness direction of the photovoltaic module, the height of the second connecting portion being greater than the height of the first connecting portion, or; along the thickness direction of the photovoltaic module, the height of the second connecting portion being the same as the height of the first connecting portion.

[0013] In some possible implementations, the lead-out solder strip further includes a body portion disposed on the backlight surface of the solar cell and electrically connected to the solar cell; the lead-out portion is located on one side of the body portion and electrically connected to the body portion, and the height of the lead-out portion is the same as the height of the body portion along the thickness direction of the photovoltaic module; the busbar includes a first connecting portion and a second connecting portion, the first connecting portion and the second connecting portion are electrically connected, the first connecting portion is located on the backlight side of the solar cell, a buffer is disposed between the first connecting portion and the solar cell, the second connecting portion is located on the side of the lead-out portion away from the conductive element and electrically connected to the lead-out portion, and the second connecting portion extends toward the conductive element along the thickness direction of the photovoltaic module, and the height of the second connecting portion is greater than the height of the first connecting portion.

[0014] In some possible implementations, at least two of the battery strings are arranged along a second direction, including a first battery string and a second battery string, with a gap between them along the second direction. The first battery string includes a first lead-out portion, and the second battery string includes a second lead-out portion. The busbar includes a first connecting portion and a second connecting portion. The first connecting portion is located at both ends of the first connecting portion and is electrically connected to the second connecting portion. Along the thickness direction of the photovoltaic module, one of the first connecting portions is located on the backlight side of the cell of the first battery string, and a first buffer is provided between the first connecting portion and the cell of the first battery string. The other first connecting portion is located on the backlight side of the cell of the second battery string, and a second buffer is provided between the first connecting portion and the cell of the second battery string. The projection of the second connecting portion along the thickness direction of the photovoltaic module is located at the gap between the first battery string and the second battery string, and the second connecting portion is electrically connected to the first lead-out portion and the second lead-out portion. The conductive element is located at the gap between the first battery string and the second battery string and is electrically connected to the first lead-out portion and the second lead-out portion.

[0015] In some possible implementations, the first lead and the second lead are stacked along the thickness direction of the photovoltaic module, and the first lead and the second lead are electrically connected; one of the first lead and the second lead is electrically connected to the second connection portion, and the other is electrically connected to the conductive element.

[0016] In some possible implementations, the first lead-out portion and the second lead-out portion are arranged along a first direction, the first lead-out portion and the second lead-out portion are electrically connected, the first lead-out portion is electrically connected to the second connecting portion and the conductive element, and the second lead-out portion is electrically connected to the second connecting portion and the conductive element.

[0017] In some possible implementations, the first lead and the second lead are arranged along a second direction and are electrically connected; alternatively, the first lead and the second lead are integrally formed. The first lead is electrically connected to the second connecting portion and the conductive element, and the second lead is electrically connected to the second connecting portion and the conductive element.

[0018] The beneficial effects of this application are as follows: the current in the lead-out section can be collected and transmitted through the conductive components and busbars, thereby increasing the area of ​​the current conduction path, reducing resistance, and thus increasing the power of the photovoltaic module. At the same time, the busbars and conductive components support and fix the lead-out section from both sides, and can also disperse the stress in the lead-out section, enhance the peel resistance and impact resistance of the lead-out solder strip, increase the welding tensile strength of the lead-out solder strip, reduce the risk of the lead-out solder strip detaching from the busbar or the lead-out solder strip breaking, thereby improving the mechanical performance of the photovoltaic module, thereby improving the reliability of the photovoltaic module and extending the service life of the photovoltaic module.

[0019] It should be understood that the above general description and the following detailed description are merely exemplary and do not limit this application. Attached Figure Description

[0020] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the structure of a photovoltaic module provided in an embodiment of this application; Figure 2 This is a schematic diagram of a battery string in a photovoltaic module according to one embodiment of this application; Figure 3 This is a schematic diagram of the connection between the battery string and the busbar in one embodiment of this application; Figure 4 This is a partial exploded view of a photovoltaic module in one embodiment of this application; Figure 5 This is a schematic diagram of the connection between the conductive element, the busbar and the battery string in one embodiment of this application; Figure 6 This is a schematic diagram showing the connection between the conductive element, the busbar, and the battery string in another embodiment of this application; Figure 7 This is a schematic diagram of the conductive element and the busbar extending along a first direction in one embodiment of this application; Figure 8 This is a schematic diagram showing the connection between the conductive element, the busbar, and the battery string in yet another embodiment of this application; Figure 9 This is a schematic diagram showing the connection between the first lead-out portion and the second lead-out portion in one embodiment of this application; Figure 10 This is a schematic diagram showing the connection between the first lead-out portion and the second lead-out portion in another embodiment of this application; Figure 11This is a schematic diagram showing the connection between the first lead-out portion and the second lead-out portion in another embodiment of this application; Figure 12 This is a schematic diagram showing the connection between the conductive element, the busbar, and the battery string in the first embodiment of this application; Figure 13 for Figure 12 Schematic diagram of the structure of the center lead-out solder strip; Figure 14 This is a schematic diagram showing the connection between the conductive element, the busbar, and the battery string in the second embodiment of this application; Figure 15 This is a schematic diagram showing the connection between the conductive element, the busbar, and the battery string in the third embodiment of this application; Figure 16 This is a schematic diagram showing the connection between the conductive element, the busbar, and the battery string in the fourth embodiment of this application; Figure 17 This is a schematic diagram showing the connection between the conductive element, the busbar, and the battery string in the fifth embodiment of this application.

[0022] Figure label: 100-Photovoltaic module; 10-Cell layer; 11-Cell string; 11a-First cell string; 11b-Second cell string; 12-Cell; 12a-Light-facing side; 12b-Backlight side; 13-Lead-out solder strip; 131-Lead-out portion; 131a-First lead-out portion; 131b-Second lead-out portion; 132-First weld joint; 133-Second weld joint; 134-First substrate; 135-First solder layer; 136-Accommodation space; 136a- Bottom wall; 136b-Side wall; 137-Body part; 14-Non-lead solder strip; 15-Busbar; 151-Third substrate; 152-Third solder layer; 153-First connection part; 154-Second connection part; 16-Conductive component; 161-Second substrate; 162-Second solder layer; 17-Buffer component; 17a-First buffer component; 17b-Second buffer component; 20-First cover plate; 30-First encapsulation layer; 40-Second encapsulation layer; 50-Second cover plate. Detailed Implementation

[0023] To better understand the technical solution of this application, the embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0024] It should be understood that the described embodiments are merely some, not all, of the embodiments in this application. All other embodiments obtained by those skilled in the art based on the embodiments in this application without inventive effort are within the scope of protection of this application.

[0025] The terminology used in the embodiments of this application is for the purpose of describing particular embodiments only and is not intended to be limiting of this application. The singular forms “a,” “the,” and “the” used in the embodiments of this application and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise.

[0026] It should be understood that the term "and / or" used in this article is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, the character " / " in this article generally indicates that the preceding and following related objects have an "or" relationship.

[0027] like Figure 1 As shown in the illustration, this application provides a photovoltaic module 100, which includes a battery layer 10, a cover plate, and an encapsulation layer. The cover plate located on the upper layer of the photovoltaic module 100 is a first cover plate 20, and the cover plate located on the lower layer of the photovoltaic module 100 is a second cover plate 50. The encapsulation layer located between the first cover plate 20 and the battery layer 10 is a first encapsulation layer 30, and the encapsulation layer located between the second cover plate 50 and the battery layer 10 is a second encapsulation layer 40. The first cover plate 20, the first encapsulation layer 30, the battery layer 10, the second encapsulation layer 40, and the second cover plate 50 can be arranged along the thickness direction Z of the photovoltaic module 100 and laminated together.

[0028] Please also refer to Figure 2 The battery layer 10 includes battery strings 11, and there can be multiple battery strings 11. Each battery string 11 includes battery cells 12 and solder ribbons electrically connected to the battery cells 12. There can be multiple battery cells 12 and multiple solder ribbons. The solder ribbons include lead-out solder ribbons 13 and non-lead-out solder ribbons 14. Lead-out solder ribbons 13 are used to achieve electrical connection between the battery cells 12 and busbars (not shown in the figure) in the photovoltaic module, and non-lead-out solder ribbons 14 are used to achieve electrical connection between two adjacent battery cells 12 within the battery string 11.

[0029] In some embodiments, the first cover plate 20 may be a glass cover plate with high light transmittance. The first encapsulation layer 30 connects the first cover plate 20 to the battery layer 10 and provides encapsulation and protection for the battery layer 10. The material of the first encapsulation layer 30 may be one or more of ethylene-vinyl acetate copolymer (EVA), polyolefin elastomer (POE), and polyvinyl butyral (PVB). The second cover plate 50 may be made of glass, or it may be composed of multiple polymer film layers. The second encapsulation layer 40 connects the battery layer 10 to the second cover plate 50 and also provides encapsulation and protection for the battery layer 10. The material of the second encapsulation layer 40 may be one or more of EVA, POE, and PVB.

[0030] In the embodiments of this application, the types of solar cells in the photovoltaic module include, but are not limited to, passivated emitter rear cell (PERC), tunnel oxide passivated contact (TOPCon), intrinsic thin-film heterojunction (HJT), perovskite solar cells, etc.

[0031] In some embodiments, a PERC cell includes a front-side silver electrode, a front-side silicon nitride passivation layer, a phosphorus emitter, a P-type silicon substrate, a localized aluminum back field, an aluminum back electrode, and a back passivation layer (Al2O3 / SiNx). The PERC cell uses a passivation film to passivate the back side, replacing the all-aluminum back field, enhancing light reflection within the silicon substrate, reducing the recombination rate on the back side, and thus improving the cell's efficiency.

[0032] In some embodiments, a TOPCon battery includes a silver electrode, a front-surface silicon nitride passivation layer, a boron-doped emitter, an N-type substrate silicon layer, a diffused doped layer, an ultrathin silicon oxide layer, doped polycrystalline silicon, silicon nitride, and the silver electrode. The back of the battery consists of an ultrathin silicon oxide layer (1 nm~2 nm) and a phosphorus-doped microcrystalline amorphous mixed silicon film, which together form a passivation contact structure. This structure can block minority carrier hole recombination, increasing the battery's open-circuit voltage and short-circuit current. The ultrathin silicon oxide layer allows majority carrier electrons to tunnel into the polycrystalline silicon layer while blocking minority carrier hole recombination. The excellent passivation effect of the ultrathin silicon oxide layer and the heavily doped silicon film causes band bending on the silicon wafer surface, resulting in a field passivation effect. This significantly increases the probability of electron tunneling, reduces contact resistance, and improves the battery's open-circuit voltage and short-circuit current, thereby improving the battery's conversion efficiency.

[0033] In some embodiments, for an HJT battery, the HJT battery includes a front low-temperature silver electrode, a front conductive film, an N-type amorphous silicon film, an intrinsic amorphous silicon film, an N-type substrate silicon layer, an intrinsic amorphous silicon film, a P-type amorphous silicon film, a back conductive film, and a back low-temperature silver electrode.

[0034] In some embodiments, a perovskite solar cell includes a substrate material, a conductive thin film, an electron transport layer, a perovskite absorption layer, a hole transport layer, and a metal electrode. Perovskite materials have a high light absorption coefficient and a long carrier diffusion distance. After the photons absorbed by the perovskite material are converted into electrons, they are easily collected by the electrode with minimal loss, thus generating high photogenerated voltage and current, resulting in high photoelectric conversion efficiency.

[0035] The following section uses TOPCon cells as an example to introduce the specific structure of photovoltaic modules.

[0036] like Figure 3 As shown, the photovoltaic module 100 also includes a busbar 15. In some embodiments, adjacent battery strings 11 are electrically connected through the busbar 15 in the first direction X and / or the second direction Y. The busbar 15 is used to realize the series or parallel connection between adjacent battery strings 11. The first direction X, the second direction Y and the thickness direction of the photovoltaic module 100 intersect each other. The first direction X can be the width direction of the photovoltaic module 100 and the second direction can be the length direction of the photovoltaic module 100.

[0037] like Figure 4 As shown, in some embodiments, the battery string 11 includes battery cells 12 and lead-out solder strips 13, which are electrically connected to the battery cells 12. The lead-out solder strips 13 include lead-out portions 131 extending out of the battery cells 12; in other words, along the thickness direction Z of the photovoltaic module 100, the projection of the lead-out portions 131 is located outside the projection of the battery cells 12. The lead-out portions 131 are electrically connected to the busbar 15. Specifically, the lead-out portions 131 can be soldered to the busbar 15, thereby achieving an electrical connection between the battery cells 12 and the busbar 15, and also fixing the lead-out portions 131 to the busbar 15.

[0038] Please also refer to Figure 5The solar cell 12 has a light-facing side 12a and a back-lighting side 12b along the thickness direction Z of the photovoltaic module 100. A portion of the busbar 15 is located on the back-lighting side 12b of the solar cell 12, so that a portion of the busbar 15 is blocked by the solar cell 12, thereby reducing the arrangement space of the busbar 15 and the cell string 11. This allows the photovoltaic module 100 to arrange more solar cells 12 in a limited space, thereby improving the output power of the photovoltaic module 100. A portion of the busbar 15 is located on one side of the lead-out portion 131 along the thickness direction Z of the photovoltaic module 100. In other words, a portion of the busbar 15 is located on the outside of the solar cell 12 and is not blocked by the solar cell 12. This portion of the structure can be welded to the lead-out portion 131.

[0039] Please also refer to Figure 4 and Figure 5 The photovoltaic module 100 also includes a conductive element 16, which is located on the side of the lead-out portion 131 opposite to the busbar 15. The conductive element 16 is electrically connected to the lead-out portion 131; specifically, the conductive element 16 can be soldered to the lead-out portion 131. Since the lead-out portion 131 is also electrically connected to the busbar 15, electrical communication is achieved among the conductive element 16, the lead-out portion 131, and the busbar 15. At the same time, the conductive element 16 is also mechanically connected to the lead-out portion 131, that is, along the thickness direction Z of the photovoltaic module 100, one side of the lead-out portion 131 is fixed to the busbar 15, and the other side of the lead-out portion 131 is fixed to the conductive element 16.

[0040] In this embodiment, a conductive element 16 is provided on the side of the lead-out portion 131 away from the busbar 15. The conductive element 16 collects and transmits the current of the lead-out portion 131 (i.e., the solder strip). That is, the current of the lead-out portion 131 can be collected and transmitted through the conductive element 16 and the busbar 15, thereby increasing the area of ​​the current conduction path, reducing the resistance, and thus increasing the power of the photovoltaic module 100. At the same time, the busbar 15 and the conductive element 16 support and fix the lead-out portion 131 from both sides, and can also disperse the stress of the lead-out portion 131, enhance the peel resistance and impact resistance of the lead-out solder strip 13, increase the welding tensile force of the lead-out solder strip 13, and reduce the risk of the lead-out solder strip 13 detaching from the busbar 15 or the lead-out solder strip 13 breaking. This improves the mechanical properties of the photovoltaic module 100, thereby improving the reliability of the photovoltaic module 100 and extending the service life of the photovoltaic module 100.

[0041] Continue as Figure 5As shown, in some possible embodiments, the lead-out portion 131 is welded to the conductive element 16, and a first welded joint portion 132 is provided between the lead-out portion 131 and the conductive element 16. The first welded joint portion 132 can be understood as a structure formed by welding the metal material in the lead-out portion 131 and the metal material in the conductive element 16 together. The lead-out portion 131 is also welded to the busbar 15, and a second welded joint portion 133 is provided between the lead-out portion 131 and the busbar 15. The second welded joint portion 133 can be understood as a structure formed by welding the metal material in the lead-out portion 131 and the metal material in the busbar 15 together. This embodiment achieves electrical connection between lead-out portion 131 and conductive element 16, and electrical connection between lead-out portion 131 and busbar 15 through welding. The first welded joint 132 formed by welding improves the reliability of the connection between conductive element 16 and lead-out portion 131, and the second welded joint 133 formed by welding improves the reliability of the connection between conductive element 16 and busbar 15. In other words, a stable connection between lead-out portion 131 and conductive element 16, and between lead-out portion 131 and busbar 15, is achieved through welding, thereby enhancing the peel resistance and impact resistance of lead-out solder strip 13 and increasing the welding tensile strength of lead-out solder strip 13.

[0042] In this embodiment, the area of ​​the first weld joint 132 is greater than or equal to the area of ​​the second weld joint 133. That is, the bonding area between the conductive element 16 and the lead-out portion 131 is greater than or equal to the bonding area between the lead-out portion 131 and the busbar 15. Having the area of ​​the first weld joint 132 equal to the area of ​​the second weld joint 133 allows for a more balanced stress distribution, which helps improve the fatigue life of the lead-out solder strip 13 and also increases the welding tensile strength of the lead-out solder strip 13, thereby improving the reliability of the photovoltaic module 100 and extending its service life. Alternatively, the area of ​​the first weld joint 132 can be greater than the area of ​​the second weld joint 133 to reduce the difficulty of the welding process and increase the stability of the bond between the conductive element 16 and the lead-out portion 131.

[0043] In some possible implementations, the area of ​​the first weld joint is smaller than the area of ​​the second weld joint, thereby meeting different usage requirements of photovoltaic modules and helping to reduce the difficulty of the welding process.

[0044] Continue as Figure 5As shown, in some possible embodiments, the cross-sectional area S of the conductive element 16 along the thickness direction Z of the photovoltaic module 100 satisfies: 1mm² ≤ S ≤ 3mm². The cross-section of the conductive element 16 along the thickness direction Z of the photovoltaic module 100 is the cross-section of the conductive element 16 in the plane formed by the thickness direction Z of the photovoltaic module 100 and the second direction Y. The area S of this cross-section can be 1mm, 1.2mm², 1.4mm², 1.6mm², 1.8mm², 2mm², 2.2mm², 2.4mm², 2.6mm², or 2.8mm². 2 Or 3mm², or of course other values ​​within the above range.

[0045] If the cross-sectional area of ​​the conductive element 16 is too large, it will occupy too much space, affecting the arrangement space of the solar cells 12 and reducing the number of solar cells 12, thus affecting the efficiency of the photovoltaic module 100. If the cross-sectional area of ​​the conductive element 16 is too small, it will not only affect the stability of the connection between the conductive element 16 and the lead-out portion 131, but also affect the conductivity of the conductive element 16, leading to an increase in the resistance of the conductive element 16 and affecting the output power of the entire photovoltaic module 100. Therefore, by limiting the cross-sectional area of ​​the conductive element 16, the space occupied by the conductive element 16 is saved, while a stable connection between the conductive element 16 and the lead-out portion 131 is achieved, and the current transmission performance of the conductive element 16 is guaranteed, which is conducive to improving the output power of the photovoltaic module 100.

[0046] Continue as Figure 5 As shown, in some possible embodiments, the height H1 of the conductive element 16 along the thickness direction Z of the photovoltaic module 100 satisfies: 0.1mm ≤ H1 ≤ 1.1mm. For example, H1 can be 0.1mm, 0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, or 1.1mm, or other values ​​within the above range. The width W1 of the conductive element 16 along the second direction Y satisfies: 1.5mm ≤ W1 ≤ 2.5mm. For example, W1 can be 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, 2mm, 2.1mm, 2.2mm, 2.3mm, 2.4mm, or 2.5mm, or other values ​​within the above range.

[0047] By limiting the height and width of the conductive element 16, the stability of the conductive element 16 itself is improved, and the current transmission performance of the conductive element 16 is also improved, which is conducive to improving the output power and reliability of the photovoltaic module 100.

[0048] In some possible implementations, the height H1 of the conductive element along the thickness direction of the photovoltaic module satisfies: 0.1mm ≤ H1 ≤ 1.1mm, or the width W1 of the conductive element along the second direction satisfies: 1.5mm ≤ W1 ≤ 2.5mm. In this embodiment, the conductive element only needs to satisfy one of the above dimensional conditions.

[0049] like Figure 6 As shown, in some possible embodiments, the lead-out solder strip 13 includes a first substrate 134 and a first solder layer 135 covering the first substrate 134. The conductive element 16 includes a second substrate 161 and a second solder layer 162 covering the second substrate 161. The busbar 15 includes a third substrate 151 and a third solder layer 152 covering the third substrate 151. The first solder layer 135 is welded to the second solder layer 162 to form a first weld joint 132, and the first solder layer 135 is welded to the third solder layer 152 to form a second weld joint 133.

[0050] In this embodiment, the first substrate 134 of the lead-out solder strip 13, the second substrate 161 of the conductive element 16, and the third substrate 151 of the busbar 15 can be metallic materials with good conductivity, such as copper or silver. The first welding layer 135 of the lead-out solder strip 13, the second welding layer 162 of the conductive element 16, and the third welding layer 152 of the busbar 15 can be metallic materials with low melting points and easy welding, such as tin or tin alloys. This arrangement ensures the conductivity of the conductive element 16, the busbar 15, and the lead-out solder strip 13, and also facilitates welding between the lead-out solder strip 13 and the conductive element 16, and between the lead-out solder strip 13 and the busbar 15.

[0051] In some embodiments, the lead-out solder strip can be a rectangular solder strip, a round wire solder strip, or a triangular solder strip; that is, the cross-section of the lead-out solder strip can be rectangular, circular, or triangular.

[0052] Optionally, the lead-out solder strip is a round wire solder strip with a diameter of 0.2 mm to 0.35 mm. For example, the diameter of the lead-out solder strip can be 0.2 mm, 0.21 mm, 0.22 mm, 0.23 mm, 0.24 mm, 0.25 mm, 0.26 mm, 0.27 mm, 0.28 mm, 0.29 mm, 0.3 mm, 0.31 mm, 0.32 mm, 0.33 mm, 0.34 mm, or 0.35 mm, or other values ​​within the above range.

[0053] In some embodiments, the conductive element may be a rectangular solder strip, a round wire solder strip, or a triangular solder strip.

[0054] Optionally, the cross-section of the conductive element can be rectangular, with the length of the rectangle being greater than its width, i.e., the conductive element is a flat solder strip.

[0055] In some embodiments, the thickness of the busbar can be from 0.1 mm to 0.15 mm, for example, 0.1 mm, 0.11 mm, 0.12 mm, 0.13 mm, 0.14 mm or 0.15 mm, or other values ​​within the above range.

[0056] like Figure 7 As shown, Figure 7 The outer contour of the busbar 15 is indicated by a dashed line. In some possible embodiments, the busbar 15 and the conductive element 16 extend along a first direction X, which is the length direction of the busbar 15 and the conductive element 16. The length of the conductive element 16 along the first direction X is equal to or less than the length of the busbar 15 along the first direction X, in order to reduce the possibility that the length of the conductive element 16 is too large, which would increase the size of the photovoltaic module 100 in the first direction X, while also ensuring that there is sufficient bonding area between the conductive element 16 and the lead-out portion 131, and between the busbar 15 and the lead-out portion 131.

[0057] In this embodiment, at least two battery strings 11 are arranged along a first direction X, and the leads of at least two battery strings 11 are electrically connected to the busbar 15 and the conductive element 16. Each battery string 11 may have multiple lead-out solder strips, and the leads of these multiple lead-out solder strips are electrically connected to the busbar 15 and the conductive element 16.

[0058] The aforementioned busbar can be an intermediate busbar, meaning that the busbar can be located between two adjacent battery strings along the second direction. The following section will provide a detailed description of the case where the busbar is an intermediate busbar.

[0059] like Figure 7 As shown, in some possible implementations, at least two battery strings 11 are arranged along the second direction Y. Please also refer to... Figure 8At least two battery strings 11 include a first battery string 11a and a second battery string 11b, with a gap between them along a second direction Y. The first battery string 11a includes a first lead-out portion 131a, and the second battery string 11b includes a second lead-out portion 131b. The busbar 15 includes a first connecting portion 153 and a second connecting portion 154, with the first connecting portion 153 located at both ends and electrically connected to the second connecting portion 154. Along the thickness direction Z of the photovoltaic module 100, a first connection portion 153 is located on the backlight side 12b of the cell 12 of the first battery string 11a, and a first buffer member 17a is provided between the first connection portion 153 and the cell 12 of the first battery string 11a. Another first connection portion 153 is located on the backlight side 12b of the cell 12 of the second battery string 11b, and a second buffer member 17b is provided between the first connection portion 153 and the cell 12 of the second battery string 11b. The projection of a second connection portion 154 along the thickness direction Z of the photovoltaic module 100 is located at the gap between the first battery string 11a and the second battery string 11b. The second connection portion 154 is electrically connected to the first lead-out portion 131a and the second lead-out portion 131b. A conductive member 16 is located at the gap between the first battery string 11a and the second battery string 11b and is electrically connected to the first lead-out portion 131a and the second lead-out portion 131b.

[0060] In this embodiment, the conductive element 16 is housed in the gap between two adjacent battery strings 11 in the second direction Y, thereby saving space occupied by the conductive element 16 in the photovoltaic module 100. The second connecting portion 154 of the busbar 15 can be located outside the gap between two adjacent battery strings 11, that is, the busbar 15 can be horizontally or approximately horizontally arranged along the second direction Y. Alternatively, the second connecting portion 154 of the busbar 15 can extend into the gap between two adjacent battery strings 11, that is, the second connecting portion 154 of the busbar 15 can extend towards the conductive element 16 along the thickness direction Z of the photovoltaic module 100.

[0061] The first buffer 17a and the second buffer 17b provide effective cushioning. These buffers can be made of elastic materials, such as polyolefin elastomer (POE), ethylene-vinyl acetate copolymer (EVA), or expandable polyethylene (EPE). The first buffer 17a and the second buffer 17b protect the solar cell 12, reducing the risk of microcracks or fragmentation, thereby improving the reliability of the photovoltaic module 100. Simultaneously, the buffers also provide insulation, reducing the risk of short circuits in the photovoltaic module 100.

[0062] Please also refer to Figure 7 and Figure 8In some possible implementations, along the second direction Y, the spacing between adjacent battery strings 11 is 2mm to 4mm. For example, the spacing between adjacent battery strings 11 can be 2mm, 2.2m, 2.4m, 2.6mm, 2.8mm, 3mm, 3.2mm, 3.4m, 3.6mm, 3.8mm, or 4mm, or other values ​​within the aforementioned range. By limiting the spacing between adjacent battery strings 11 in the second direction Y, the area of ​​blank regions on the photovoltaic module 100 is reduced. These blank regions refer to areas without solar cells 12 that cannot perform photoelectric conversion. By reducing the area of ​​blank regions, the proportion of effective light-receiving area of ​​the photovoltaic module 100 can be increased, thereby increasing the output power per unit area of ​​the photovoltaic module 100 and improving the performance of the photovoltaic module 100.

[0063] like Figure 9 As shown, in some possible embodiments, the first lead-out portion 131a and the second lead-out portion 131b are stacked along the thickness direction Z of the photovoltaic module. The first lead-out portion 131a and the second lead-out portion 131b are electrically connected. One of the first lead-out portion 131a and the second lead-out portion 131b is electrically connected to the second connection portion of the busbar (not shown in the figure), and the other is electrically connected to a conductive element (not shown in the figure).

[0064] In this embodiment, the first lead-out portion 131a and the second lead-out portion 131b can be welded, and one of the first lead-out portion 131a and the second lead-out portion 131b is welded to the second connecting portion, while the other is welded to the conductive component, thereby realizing the electrical and mechanical connection between the busbar, the conductive component, and the lead-out solder strip. The first lead-out portion 131a and the second lead-out portion 131b are stacked along the thickness direction Z of the photovoltaic module, which helps to save the space occupied by the lead-out portion as a whole in the second direction Y, thereby helping to reduce the spacing between two adjacent battery strings 11 in the second direction Y, so that the battery strings 11 can be arranged more compactly to increase the effective light-receiving area of ​​the photovoltaic module.

[0065] like Figure 10 As shown, in some possible embodiments, the first lead-out portion 131a and the second lead-out portion 131b are arranged along the first direction X, the first lead-out portion 131a and the second lead-out portion 131b are electrically connected, the first lead-out portion 131a is electrically connected to the second connecting portion of the busbar and the conductive element (not shown in the figure), and the second lead-out portion 131b is electrically connected to the second connecting portion of the busbar and the conductive element.

[0066] In this embodiment, the first lead-out portion 131a and the second lead-out portion 131b can be welded. The first lead-out portion 131a is welded to the second connecting portion and the conductive component, and the second lead-out portion 131b is welded to the second connecting portion and the conductive component. The first lead-out portion 131a and the second lead-out portion 131b are arranged along the first direction X, so that both can be connected to the busbar and the conductive component, thereby increasing the contact area between the lead-out solder strip and the busbar and the conductive component, that is, increasing the bonding area between the lead-out solder strip and the busbar and between the lead-out solder strip and the conductive component. This enhances the peel resistance and impact resistance of the lead-out solder strip, improves the welding tensile strength of the lead-out solder strip, improves the mechanical properties of the photovoltaic module, and thus improves the reliability of the photovoltaic module and extends its service life.

[0067] like Figure 11 As shown, in some possible embodiments, the first lead-out portion 131a and the second lead-out portion 131b are arranged along the second direction Y, and the first lead-out portion 131a and the second lead-out portion 131b are electrically connected. Alternatively, the first lead-out portion 131a and the second lead-out portion 131b are integrally formed, the first lead-out portion 131a is electrically connected to the second connecting portion of the busbar and the conductive element (not shown in the figure), and the second lead-out portion 131b is electrically connected to the second connecting portion of the busbar and the conductive element.

[0068] In this embodiment, the first lead-out portion 131a and the second lead-out portion 131b are welded together, or the first lead-out portion 131a and the second lead-out portion 131b are integrally formed. That is, two adjacent battery strings 11 in the second direction can be connected to the busbar through the same lead-out solder strip. The first lead-out portion 131a is welded to the second connecting portion and the conductive component, and the second lead-out portion 131b is welded to the second connecting portion and the conductive component. The integral formation of the first lead-out portion 131a and the second lead-out portion 131b increases the contact area between the lead-out solder strip and the busbar and the conductive component, while simplifying the welding process of the photovoltaic module, thereby helping to reduce the technological difficulty of photovoltaic module production.

[0069] like Figure 12 and Figure 13 As shown, in some possible embodiments, the lead-out portion 131 is recessed toward one side of the busbar 15 to form a receiving space 136, at least a portion of the structure of the conductive member 16 is received in the receiving space 136, and the conductive member 16 is electrically connected to the inner wall of the receiving space 136.

[0070] In this embodiment, the lead-out portion 131 can be bent towards the busbar 15 to form a receiving space 136. The shape of the bent lead-out portion 131 can be L-shaped, U-shaped, or V-shaped. The conductive element 16 can be partially or entirely housed within the receiving space 136 of the lead-out portion 131. The inner wall of the receiving space 136 includes a bottom wall 136a and a side wall 163b. The conductive element 16 can be electrically connected to the bottom wall 136a and / or the side wall 163b. That is, the conductive element 16 can be electrically connected to a portion of the inner wall of the receiving space 136, or the conductive element 16 can be electrically connected to the entire inner wall of the receiving space 136.

[0071] By forming a receiving space 136 in the lead-out portion 131, the contact area between the lead-out portion 131 and the conductive element 16 is increased, which in turn increases the bonding area between the lead-out portion 131 and the conductive element 16. This improves the stability and reliability of the bonding between the lead-out portion 131 and the conductive element 16, thereby increasing the welding pull force of the lead-out solder strip 13. At the same time, the lead-out portion 131 provides a receiving space for the conductive element 16, saving the space occupied by the conductive element 16 within the photovoltaic module, thus helping to reduce the thickness of the photovoltaic module.

[0072] like Figure 12 and Figure 13 As shown, in one possible implementation, the lead-out solder strip 13 further includes a body portion 137 located on the solar cell 12, the body portion 137 being electrically connected to the solar cell 12, the lead-out portion 131 being located on one side of the body portion 137 and being electrically connected to the body portion 137, and the height of the lead-out portion 131 along the thickness direction Z of the photovoltaic module being greater than the height of the body portion 137 along the thickness direction Z of the photovoltaic module.

[0073] In this embodiment, the lead-out solder strip 13 includes a body portion 137 and a lead-out portion 131. The body portion 137 can be integrally formed with the lead-out portion 131. The body portion 137 can be electrically connected to the solder joint (not shown in the figure) on the solar cell 12, and the lead-out portion 131 can be electrically connected to the busbar 15, thereby realizing the electrical connection between the solar cell 12 and the busbar 15. The height of the lead-out portion 131 along the thickness direction Z of the photovoltaic module is greater than the height of the body portion 137 along the thickness direction Z of the photovoltaic module 100. That is, the lead-out portion 131 can protrude relative to the body portion 137, thereby forming a receiving space 136. Specifically, the body portion 137 can extend along the second direction Y, and the lead-out portion 131 bends towards the side of the busbar 15 along the thickness direction Z of the photovoltaic module to form the receiving space 136, and a height difference is formed between the lead-out portion 131 and the body portion 137 in the thickness direction Z of the photovoltaic module.

[0074] like Figure 12As shown, in some embodiments, the lead-out solder strip 13 may be located on the backlight side 12b of the cell 12. The conductive element 16 does not extend beyond the non-lead-out solder strip 14 on the light-facing side 12a of the cell 12 along the thickness direction Z of the photovoltaic module.

[0075] like Figure 14 As shown, in some embodiments, the body portion 137 of the lead-out solder ribbon 13 is located on the light-facing side 12a of the solar cell 12. The lead-out portion 131 of the lead-out solder ribbon 13 is recessed towards one side of the busbar 15 to form a receiving space, in which the conductive element 16 is housed, and the conductive element 16 is electrically connected to the inner wall of the receiving space 136. The conductive element 16 does not extend beyond the body portion 137 of the lead-out solder ribbon 13 along the thickness direction Z of the photovoltaic module.

[0076] like Figure 14 and Figure 15 As shown, in some possible embodiments, the busbar 15 includes a first connecting portion 153 and a second connecting portion 154. The first connecting portion 153 and the second connecting portion 154 are electrically connected. The first connecting portion 153 is located on the backlight side 12b of the battery cell 12. A buffer member 17 is provided between the first connecting portion 153 and the battery cell 12. The second connecting portion 154 is located on the side of the lead-out portion 131 opposite to the conductive member 16 and is electrically connected to the lead-out portion 131. Figure 14 As shown, along the thickness direction Z of the photovoltaic module, the height of the second connection portion 154 is the same as the height of the first connection portion 153. Alternatively, as... Figure 15 As shown, along the thickness direction Z of the photovoltaic module, the second connection portion 154 extends toward the conductive element 16, and the height of the second connection portion 154 is greater than the height of the first connection portion 153.

[0077] In this embodiment, the first connecting portion 153 can be integrally formed with the second connecting portion 154. The first connecting portion 153 is located on the backlight side 12b of the battery cell 12, and the second connecting portion 154 extends outward from the battery cell 12 and is electrically connected to the conductive member 16.

[0078] The function of the buffer 17 has been described above and will not be repeated here. Because of the buffer 17, the height of the busbar 15 is increased, thus increasing the distance between the busbar 15 and the lead-out portion 131 in the thickness direction Z of the photovoltaic module. Based on this, as... Figure 14As shown, in one specific embodiment, along the thickness direction Z of the photovoltaic module, the height of the second connecting portion 154 is the same as the height of the first connecting portion 153. That is, the busbar 15 can be horizontally or approximately horizontally arranged along the second direction Y. The lead-out portion 131 extends towards the busbar 15 to reduce the distance between the second connecting portion 154 and the lead-out portion 131 in the thickness direction Z of the photovoltaic module, thereby facilitating the electrical connection between the busbar 15 and the lead-out portion 131. In this embodiment, the lead-out solder strip 13 can be disposed on the light-facing side 12a of the cell 12, or the lead-out solder strip 13 can also be disposed on the backlight side 12b of the cell 12.

[0079] It should be noted that during the manufacturing process of the busbar, due to factors such as the manufacturing process, there may be a certain error between the height of the first connecting part and the height of the second connecting part. The fact that the height of the first connecting part and the height of the second connecting part are the same as mentioned above can be understood as the actual measured height of the first connecting part and the second connecting part being consistent within the specified measurement tolerance range or within the allowable manufacturing error range. In other words, if there is a height difference between the first connecting part and the second connecting part, and the value of the height difference is within the preset range, the height of the first connecting part and the second connecting part are considered to be substantially the same.

[0080] like Figure 15 As shown, in another specific embodiment, along the thickness direction Z of the photovoltaic module, the second connecting portion 154 extends towards the conductive element 16. The height of the second connecting portion 154 is greater than the height of the first connecting portion 153. That is, the second connecting portion 154 protrudes relative to the first connecting portion 153 to reduce the distance between the second connecting portion 154 and the lead-out portion 131 in the thickness direction Z of the photovoltaic module. At the same time, along the thickness direction Z of the photovoltaic module, the lead-out portion 131 extends towards the busbar 15, similarly reducing the distance between the second connecting portion 154 and the lead-out portion 131 in the thickness direction Z of the photovoltaic module, thereby facilitating the electrical connection between the busbar 15 and the lead-out portion 131. The second connecting portion 154 can be bent into a U-shape or V-shape towards the conductive element 16, so that the distance between the second connecting portion 154 and the lead-out portion 131 can be reduced without increasing its own thickness. In this embodiment, the lead-out solder strip 13 can be disposed on the light-facing side 12a of the battery cell 12, or the lead-out solder strip 13 can also be disposed on the backlight side 12b of the battery cell 12.

[0081] like Figure 16As shown, in some possible embodiments, the lead-out solder strip 13 is disposed on the backlight side 12b of the solar cell 12. The body portion 137 of the lead-out solder strip 13 is disposed on the backlight surface of the solar cell 12, and the body portion 137 is electrically connected to the solar cell 12. The lead-out portion 131 is located on one side of the body portion 137 and is electrically connected to the body portion 137. The lead-out portion 131 can be integrally formed with the body portion 137. Along the thickness direction Z of the photovoltaic module, the height of the lead-out portion 131 is the same as the height of the body portion 137. That is, the lead-out solder strip 13 can be horizontally or approximately horizontally disposed along the second direction Y. The first connecting portion 153 of the busbar 15 is located on the backlight side 12b of the solar cell 12. A buffer 17 is provided between the first connecting portion 153 and the solar cell 12. The second connecting portion 154 is located on the side of the lead-out portion 131 away from the conductive member 16 and is electrically connected to the lead-out portion 131. Along the thickness direction Z of the photovoltaic module, the second connecting portion 154 extends toward the conductive member 16. The height of the second connecting portion 154 is greater than the height of the first connecting portion 153, so as to reduce the distance between the second connecting portion 154 and the lead-out portion 131 in the thickness direction Z of the photovoltaic module, so as to facilitate the electrical connection between the busbar 15 and the lead-out portion 131.

[0082] It should be noted that during the manufacturing process of the lead-out solder strip, due to factors such as the manufacturing process, there may be a certain error between the height of the lead-out part and the height of the body part. The fact that the height of the lead-out part is the same as the height of the body part, as mentioned above, can be understood as the actual measured height of the lead-out part and the body part being consistent within the specified measurement tolerance range or within the allowable manufacturing error range. In other words, if there is a height difference between the lead-out part and the body part, and the value of the height difference is within the preset range, the height of the lead-out part and the body part are considered to be substantially the same.

[0083] In summary, in some embodiments of this application, the lead-out portion of the lead-out solder strip can extend toward the busbar, and / or the second connecting portion of the busbar can extend toward the lead-out portion to reduce the distance between the busbar and the lead-out portion in the thickness direction of the photovoltaic module.

[0084] Continue as Figure 16 As shown, in some embodiments, along the second direction Y, the width of the buffer 17 can be greater than or equal to the width of the first connecting portion 153 of the busbar 15, thereby increasing the effective area of ​​the buffer 17 to provide reliable protection for the battery cell 12 and reduce the risk of microcracks or fragmentation of the battery cell 12.

[0085] In some implementations, the width of the buffer 17 along the second direction Y is 5mm to 13mm, for example, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, 11mm, 12mm or 13mm, or other values ​​within the above range.

[0086] In some embodiments, the thickness of the buffer 17 along the thickness direction Z of the photovoltaic module is 0.2 mm to 0.4 mm, for example, 0.2 mm, 0.22 mm, 0.24 mm, 0.26 mm, 0.28 mm, 0.3 mm, 0.32 mm, 0.34 mm, 0.36 mm, 0.38 mm, or 0.4 mm, or other values ​​within the above range. By limiting the thickness of the buffer 17, the reliability of the buffer 17 is ensured while reducing the possibility of excessive thickness of the photovoltaic module.

[0087] In some embodiments, the length of the buffer element along the first direction is equal to the length of the busbar, thereby increasing the effective area of ​​the buffer element and providing reliable protection for the solar cells, reducing the risk of microcracks and fragmentation. In other embodiments, the length of the buffer element along the first direction may be slightly less than the length of the busbar.

[0088] In some embodiments of this application, the busbar can be an edge busbar. For example... Figure 17 As shown, the busbar 15 can be disposed at the edge of the photovoltaic module along the second direction Y and is electrically connected to the outermost cell string 11 of the photovoltaic module. A portion of the structure of the busbar 15 is located on the backlight side 12b of the cell 12, and a portion of the structure of the busbar 15 extends out of the cell 12. This portion of the structure is electrically connected to the lead-out portion 131 of the lead-out solder strip and the conductive element 16.

[0089] In the process of photovoltaic module manufacturing, multiple solar cells can be connected to form a cell string using solder strips. After the cell strings are prepared, they are arranged in a preset manner, and then busbars and conductive components are soldered to both sides of the lead-out portion of the solder strips. The soldering methods include, but are not limited to, infrared welding, laser welding, ultrasonic welding, and electromagnetic welding.

[0090] In some embodiments, after the battery string is prepared, the conductive component can be placed on the working platform of the welding mechanism, the lead-out portion of the lead-out welding strip can be stacked on the conductive component, and then the busbar can be stacked on the lead-out portion. After stacking, the lead-out portion, the conductive component and the busbar are welded.

[0091] In some embodiments, after the lead-out solder strips are welded to the conductive parts and the busbars, an encapsulation layer and a cover plate are laid on the light-facing side and the backlight side of the battery string, and then laminated to form a laminate.

[0092] In some embodiments, after obtaining a laminate through a lamination process, a frame is installed on the edge of the laminate to form a photovoltaic module.

[0093] The above description is merely an optional embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A photovoltaic module, characterized by, include: A battery string, the battery string including battery cells and lead-out solder strips, the lead-out solder strips being electrically connected to the battery cells, the lead-out solder strips including leads extending out of the battery cells; A busbar, a portion of which is located on the backlight side of the battery cell, and which is electrically connected to the lead-out portion; A conductive element is located on the side of the lead-out portion away from the busbar, and the conductive element is electrically connected to the lead-out portion.

2. The photovoltaic module of claim 1, wherein, The lead-out portion is welded to the conductive component, and a first welded joint portion is formed between the lead-out portion and the conductive component; The lead-out portion is welded to the busbar, and a second welded joint portion is provided between the lead-out portion and the busbar, wherein the area of ​​the first welded joint portion is greater than or equal to the area of ​​the second welded joint portion.

3. The photovoltaic module of claim 2, wherein, The lead-out solder strip includes a first substrate and a first solder layer covering the first substrate; The conductive element includes a second substrate and a second welding layer covering the second substrate; The busbar includes a third substrate and a third welding layer covering the third substrate; The first welding layer and the second welding layer are welded together to form the first weld joint; The first welding layer and the third welding layer are welded together to form the second welded joint.

4. The photovoltaic module of claim 1, wherein, The busbar and the conductive element extend along a first direction, and the length of the conductive element along the first direction is equal to or less than the length of the busbar along the first direction; At least two of the battery strings are arranged along the first direction, and the leads of at least two of the battery strings are electrically connected to the busbar and the conductive element.

5. The photovoltaic module of claim 1, wherein, The cross-sectional area S of the conductive element along the thickness direction of the photovoltaic module satisfies: 1mm²≤S≤3mm².

6. The photovoltaic module of claim 1, wherein, The height H1 of the conductive element along the thickness direction of the photovoltaic module satisfies: 0.1mm ≤ H1 ≤ 1.1mm, and / or; The width W1 of the conductive element along the second direction satisfies: 1.5mm≤W1≤2.5mm.

7. The photovoltaic module of claim 1, wherein, The lead-out portion is recessed into one side of the busbar to form a receiving space, at least a portion of the structure of the conductive element is housed within the receiving space, and the conductive element is electrically connected to the inner wall of the receiving space.

8. The photovoltaic module of claim 7, wherein, The lead-out solder strip also includes a body portion located on the battery cell, the body portion being electrically connected to the battery cell; The lead-out portion is located on one side of the main body and is electrically connected to the main body. The height of the lead-out portion along the thickness direction of the photovoltaic module is greater than the height of the main body along the thickness direction of the photovoltaic module.

9. The photovoltaic module of claim 8, wherein, The busbar includes a first connecting part and a second connecting part, wherein the first connecting part and the second connecting part are electrically connected; The first connecting part is located on the backlight side of the battery cell, and a buffer is provided between the first connecting part and the battery cell; The second connection portion is located on the side of the lead-out portion away from the conductive element, and is electrically connected to the lead-out portion; The second connecting part extends in the direction of the conductive piece along the thickness direction of the photovoltaic module, and the height of the second connecting part is greater than the height of the first connecting part, or the height of the second connecting part is the same as the height of the first connecting part along the thickness direction of the photovoltaic module.

10. The photovoltaic module of claim 1, wherein, The lead-out solder strip further comprises a body part arranged on the back light surface of the cell sheet, and the body part is electrically connected with the cell sheet; the lead-out part is located on one side of the body part and is electrically connected with the body part, and the height of the lead-out part is the same as the height of the body part along the thickness direction of the photovoltaic module; The bus bar comprises a first connecting part and a second connecting part, the first connecting part is electrically connected with the second connecting part, the first connecting part is located on the back light side of the cell sheet, and a buffer is arranged between the first connecting part and the cell sheet; The second connecting part is located on the side of the lead-out part away from the conductive piece and is electrically connected with the lead-out part, the second connecting part extends in the direction of the conductive piece along the thickness direction of the photovoltaic module, and the height of the second connecting part is greater than the height of the first connecting part.

11. The photovoltaic module according to any of claims 1 to 10, characterized in that, At least two cell strings are arranged along a second direction, and the at least two cell strings comprise a first cell string and a second cell string, and the first cell string and the second cell string have a spacing along the second direction, the first cell string comprises a first lead-out part, and the second cell string comprises a second lead-out part; The bus bar comprises a first connecting part and a second connecting part, the first connecting part is located at both ends of the first connecting part, the first connecting part is electrically connected with the second connecting part, one of the first connecting parts is located on the back light side of the cell sheet of the first cell string along the thickness direction of the photovoltaic module, and a first buffer is arranged between the first connecting part and the cell sheet of the first cell string; the other first connecting part is located on the back light side of the cell sheet of the second cell string, and a second buffer is arranged between the first connecting part and the cell sheet of the second cell string; The projection of the second connecting part along the thickness direction of the photovoltaic module is located at the gap between the first cell string and the second cell string, and the second connecting part is electrically connected with the first lead-out part and the second lead-out part; The conductive piece is located at the gap between the first cell string and the second cell string and is electrically connected with the first lead-out part and the second lead-out part.

12. The photovoltaic module of claim 11, wherein, The first lead-out part and the second lead-out part are stacked along the thickness direction of the photovoltaic module, and the first lead-out part and the second lead-out part are electrically connected; one of the first lead-out part and the second lead-out part is electrically connected with the second connecting part, and the other is electrically connected with the conductive piece.

13. The photovoltaic module of claim 11, wherein, The first lead-out part and the second lead-out part are arranged along a first direction, and the first lead-out part and the second lead-out part are electrically connected; The first lead-out part is electrically connected with the second connecting part and the conductive piece, and the second lead-out part is electrically connected with the second connecting part and the conductive piece.

14. The photovoltaic module of claim 11, wherein, The first lead-out part and the second lead-out part are arranged along a second direction, and the first lead-out part and the second lead-out part are electrically connected, or the first lead-out part and the second lead-out part are integrally formed. The first lead-out part is electrically connected with the second connecting part and the conductive part, and the second lead-out part is electrically connected with the second connecting part and the conductive part.

Images