Conductive film for solar cell interconnection, solar cell string, solar cell module, power generation device, and power utilization device

Abstract

The utility model discloses a conductive film for solar cell interconnection, a solar cell string, a solar cell module, a power generation device and a power utilization device. The conductive film for solar cell interconnection comprises a base film, and one side of the base film comprises a plurality of first areas which are arranged at intervals along a first direction; the conducting layer comprises a first conducting structure and a second conducting structure which are arranged at an interval, and the first conducting structure and the second conducting structure are located in the first area of the base film; the first conductive structure and the second conductive structure are electrically connected with opposite electrodes of the solar cell respectively; the first conductive structure of the first region is electrically connected with the second conductive structure of the adjacent first region. Therefore, the conductive film provided by the utility model is simple in structure and easy to manufacture and install, does not need complex welding equipment and process, reduces the difficulty and cost of production and manufacturing, is beneficial to improving the consistency of production efficiency and product quality, and enables the interconnection process of solar cells to be more efficient and reliable.

Description

Technical Field

[0001] This application belongs to the field of battery technology, and more specifically, relates to conductive films for interconnecting solar cells, solar cell strings, solar cell modules, power generation devices, and power consumption devices. Background Technology

[0002] Solar cells are semiconductor devices that convert light energy into electrical energy. High application reliability, low production cost, and high energy conversion efficiency have always been the goals pursued by the solar cell industry. After the solar cells are manufactured, they need to be connected into solar cell strings using various interconnection technologies to realize applications. However, the interconnection technology for solar cell strings still needs further improvement. Utility Model Content

[0003] In view of the technical problems existing in the background art, the first aspect of this application provides a conductive film for interconnecting solar cells, comprising: a base film, one side of which includes a plurality of first regions spaced apart along a first direction; a conductive layer, the conductive layer including a first conductive structure and a second conductive structure spaced apart, the first conductive structure and the second conductive structure being located in the first regions of the base film; the first conductive structure and the second conductive structure being electrically connected to the opposite electrode of the solar cell; the first conductive structure in the first region being electrically connected to the second conductive structure in the adjacent first region.

[0004] Therefore, the conductive film structure provided by this application is simple, easy to manufacture and install, and does not require complex welding equipment and processes, which reduces the difficulty and cost of production and manufacturing, and helps to improve production efficiency and product quality consistency, making the interconnection process of solar cells more efficient and reliable.

[0005] In some embodiments, the first conductive structure and / or the second conductive structure in each of the first regions extends continuously along the first direction, and the first conductive structure and the second conductive structure are arranged alternately along the second direction, wherein the first direction intersects the second direction.

[0006] In some embodiments, the base film further includes a second region located between adjacent first regions; the conductive layer further includes a third conductive structure, one end of which is electrically connected to a first conductive structure adjacent to the first region on one side of the third conductive structure, and the other end of which is electrically connected to a second conductive structure adjacent to the first region on the other side of the third conductive structure.

[0007] In some embodiments, along the first direction, the two ends of the base film include a third region and a fourth region on the same side as the first region; the conductive layer further includes a wiring conductive structure electrically connected to an external circuit, the wiring conductive structure being located in the third region and / or the fourth region; the wiring conductive structure in the third region is electrically connected to the second conductive structure in the first region adjacent to the third region, and the wiring conductive structure in the fourth region is electrically connected to the first conductive structure in the first region adjacent to the fourth region.

[0008] In some embodiments, the width of the first conductive structure and the width of the second conductive structure are each independently between 30 μm and 600 μm.

[0009] In some embodiments, the spacing between the first conductive structure and the second conductive structure is 30 μm-600 μm.

[0010] In some embodiments, a shielding member is also included, the shielding member being located in the second region of the base film, and the third conductive structure being located between the base film and the shielding member.

[0011] In some embodiments, the shielding member includes one or more of an insulating film layer and an insulating coating layer.

[0012] In some embodiments, the thickness of the conductive layer is 10 μm-100 μm.

[0013] In some embodiments, the thickness of the base film is 10 μm-5000 μm.

[0014] In some embodiments, the conductive layer is a metal foil, which is copper, copper alloy, aluminum, aluminum alloy, nickel, nickel alloy, gold, gold alloy, silver, or silver alloy.

[0015] In some embodiments, the base film is flexible.

[0016] In some embodiments, the base film is polyimide, polyethylene terephthalate, polyethylene naphthalate, liquid crystal display polymer, polyolefin, or ethylene-vinyl acetate copolymer.

[0017] In some embodiments, the width of the conductive film is located in the second direction, and the width of the conductive film is 150mm-1400mm.

[0018] In a second aspect, this application provides a solar cell string, including a conductive film for interconnecting solar cells according to the first aspect of this application.

[0019] In a third aspect, this application provides a solar cell module including a plurality of solar cell strings of the second aspect of this application arranged at intervals.

[0020] In a fourth aspect, this application provides a power generation device, including a solar cell module as described in the third aspect of this application.

[0021] In its fifth aspect, this application provides an electrical device including a solar cell module as described in its third aspect. Attached Figure Description

[0022] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0023] Figure 1 This is an exploded view of a solar cell module according to one embodiment of this application.

[0024] Figure 2 This is a cross-sectional view of a solar cell according to one embodiment of this application.

[0025] Figure 3 This is a schematic diagram of the electrode layer distribution of a solar cell according to one embodiment of this application.

[0026] Figure 4 This is a schematic diagram of the electrode layer distribution of a solar cell in another embodiment of this application.

[0027] Figure 5 This is a schematic diagram of the electrode layer distribution of a solar cell in another embodiment of this application.

[0028] Figure 6 This is a schematic diagram of the electrode layer distribution of a solar cell in another embodiment of this application.

[0029] Figure 7 This is a schematic diagram of the structure of a solar cell string in one embodiment of this application.

[0030] Figure 8 This is a schematic diagram of the arrangement of multiple solar cells in one embodiment of this application.

[0031] Figure 9 This is a schematic diagram of the arrangement of multiple solar cells in another embodiment of this application.

[0032] Figure 10 This is a schematic diagram of the arrangement of multiple solar cells in another embodiment of this application.

[0033] Figure 11 This is a schematic diagram of the arrangement of multiple solar cells in another embodiment of this application.

[0034] Figure 12 This is a schematic diagram of the structure of the conductive film in one embodiment of this application.

[0035] Figure 13 This is a schematic diagram of the structure of the conductive film in another embodiment of this application.

[0036] Figure 14 This is a schematic diagram of the structure of the conductive film in another embodiment of this application.

[0037] Figure 15 This is a schematic diagram of the structure of the conductive film in another embodiment of this application.

[0038] Figure 16 This is an embodiment of the present application. Figure 7 The cross-sectional view of the solar cell string shown is cut along line AA.

[0039] Figure 17 In another embodiment of this application, along Figure 7 The cross-sectional view of the solar cell string shown is cut along line AA.

[0040] Figure 18 This is a schematic diagram of the distribution of the adhesive in one embodiment of this application.

[0041] Figure 19 This is a schematic diagram of the distribution of the adhesive in another embodiment of this application.

[0042] Figure 20 This is a schematic diagram of the structure of a solar cell string in one embodiment of this application.

[0043] Figure 21 This is a side view of one end of the solar cell string in a solar cell module according to one embodiment of this application.

[0044] Figure 22 This is a side view of one end of the solar cell string in a solar cell module according to another embodiment of this application.

[0045] Figure 23 This is a side view of one end of the solar cell string in a solar cell module according to another embodiment of this application.

[0046] Figure 24 This is a schematic diagram of the structure of a solar cell module according to one embodiment of this application.

[0047] Figure label:

[0048] 1. First battery string group; 2. Second battery string group.

[0049] 10. Solar cell; 10a. First cell; 10b. Second cell; 10c. Third cell; 11. First electrode; 111. First finger electrode; 112. First bus electrode; 12. Second electrode; 121. Second finger electrode; 122. Second bus electrode; 13. First semiconductor region; 14. Second semiconductor region; 15. Trench; 16. First interface passivation layer; 17. Second interface passivation layer; 18. Semiconductor substrate; 20. Conductive film; 21. Base film; 211. First region; 212. Second region; 213. Third region; 214. Protrusion structure; 22. Conductive layer; 221. First conductive structure; 222. Second conductive structure; 223. Third conductive structure; 224. Bus conductive structure; 225. Conductive contact; 226. Wiring conductive structure; 30. Adhesive; 40. Shielding member.

[0050] 100, Solar cell string; 200, First cover plate; 300, Second cover plate; 400, First encapsulation layer; 500, Second encapsulation layer; 600, Busbar. Detailed Implementation

[0051] The present application will be further described below with reference to specific embodiments. It should be understood that these specific embodiments are for illustrative purposes only and are not intended to limit the scope of the present application.

[0052] The following detailed description, with appropriate reference to the accompanying drawings, specifically discloses embodiments of the conductive film for interconnecting solar cells, solar cell strings, solar cell modules, power generation devices, and power consumption devices of this application. However, unnecessary detailed descriptions may be omitted. For example, detailed descriptions of well-known matters and repetitive descriptions of practically identical structures may be omitted. This is to avoid unnecessarily lengthy descriptions and to facilitate understanding by those skilled in the art. Furthermore, the accompanying drawings and the following description are provided for the purpose of enabling those skilled in the art to fully understand this application and are not intended to limit the subject matter of the claims.

[0053] The "range" disclosed in this application is defined in the form of a lower limit and / or an upper limit. A given range is defined by selecting a lower limit and / or an upper limit, which defines the boundary of the particular range. Ranges defined in this way may or may not include endpoints and can be arbitrarily combined; that is, any lower limit can be combined with any upper limit to form an undefined range, and any lower limit can be combined with other lower limits to form an undefined range, just as any upper limit can be combined with any other upper limit to form an undefined range. Furthermore, each individually disclosed point or single value can itself serve as a lower limit or upper limit and can be combined with any other point or single value or with other lower limits or upper limits to form an undefined range. For example, if ranges of 60~120 and 80~110 are listed for a specific parameter, it is expected that the ranges of 60~110 and 80~120 will also be understood. Furthermore, if the minimum range values ​​1 and 2 are listed, and if the maximum range values ​​3, 4, and 5 are listed, then the following ranges can all be expected: 1~3, 1~4, 1~5, 2~3, 2~4, and 2~5. In this application, unless otherwise stated, the numerical range "a~b" represents a shortened representation of any combination of real numbers between a and b, where a and b are both real numbers. For example, the numerical range "0~5" means that all real numbers between "0~5" have been listed herein, and "0~5" is merely a shortened representation of these numerical combinations. Additionally, when a parameter is stated as an integer ≥2, it is equivalent to disclosing that the parameter is, for example, an integer 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, etc.

[0054] Unless otherwise specified, all embodiments and optional embodiments of this application may be combined with each other to form new technical solutions, and such technical solutions should be considered to be included in the disclosure of this application.

[0055] Unless otherwise specified, all technical features and optional technical features of this application may be combined to form new technical solutions, and such technical solutions shall be deemed to be included in the disclosure of this application.

[0056] Unless otherwise specified, the terms "comprising" and "including" as used in this application can be open-ended or closed-ended. For example, "comprising" and "including" can mean that other components not listed may also be included, or that only the listed components may be included.

[0057] Unless otherwise specified, the term "or" is inclusive in this application. For example, the phrase "A or B" means "A, B, or both A and B". More specifically, the condition "A or B" is satisfied by any of the following conditions: A is true (or exists) and B is false (or does not exist); A is false (or does not exist) and B is true (or exists); or both A and B are true (or exist).

[0058] Unless otherwise specified, in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0059] In this application, the terms "multiple" or "various" refer to two or more kinds.

[0060] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in this application is for the purpose of describing particular embodiments only and is not intended to limit this application; the terms "comprising" and "having," and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion. Unless otherwise stated, the terms used in this application have their commonly understood meanings as understood by one of ordinary skill in the art. Unless otherwise stated, the numerical values ​​of the parameters mentioned in this application can be measured using various measurement methods commonly used in the art (e.g., they can be tested according to the methods given in the embodiments of this application).

[0061] In the electrical interconnection technology of solar cells 10, how to efficiently interconnect multiple solar cells 10 to improve the overall power generation efficiency of the battery is a key challenge. Traditional interconnection methods have the following problems: large current transmission loss. For example, using conductive wires with a conductive alloy coating to electrically connect the positive and negative electrodes of multiple solar cells 10 in series, and forming electrical contact between the conductive wires and electrodes through high-temperature welding, but in practical applications, the conductive wires will deform due to temperature changes of the solar cells 10, resulting in unstable electrical contact at the welding point, increasing contact resistance, and thus causing current transmission loss; complex interconnection structure. For example, the deformation of the conductive wires will cause displacement of the solar cells 10 at the welding point, which not only affects the structural stability of the battery, but also makes the entire interconnection structure more complex, increasing the difficulty and cost of manufacturing, and is also detrimental to the reliability and durability of the battery in actual use.

[0062] Therefore, the interconnection method of solar cell 10 needs further improvement.

[0063] Based on this, a first aspect of this application provides a conductive film 20 for interconnecting solar cells, comprising: a base film 21, one side of which includes a plurality of first regions 211 spaced apart along a first direction; a conductive layer 22, which includes a first conductive structure 221 and a second conductive structure 222 spaced apart, the first conductive structure 221 and the second conductive structure 222 being located in the first region 211 of the base film 21; the first conductive structure 221 and the second conductive structure 222 being electrically connected to the opposite electrode of the solar cell 10; and the first conductive structure 221 of the first region 211 being electrically connected to the second conductive structure 222 of the adjacent first region 211.

[0064] Therefore, the conductive film 20 provided in this application has a simple structure, is easy to manufacture and install, does not require complex welding equipment and processes, reduces the difficulty and cost of production and manufacturing, and is conducive to improving production efficiency and product quality consistency, making the interconnection process of solar cell 10 more efficient and reliable.

[0065] In some embodiments, the first conductive structure 221 and / or the second conductive structure 222 in each first region 211 extend continuously along a first direction, and the first conductive structure 221 and the second conductive structure 222 are arranged alternately along a second direction, with the first direction intersecting the second direction.

[0066] In some embodiments, the base film 21 further includes a second region 212 located between adjacent first regions 211; the conductive layer 22 further includes a third conductive structure 223 located in the second region 212, one end of the third conductive structure 223 being electrically connected to a first conductive structure 221 adjacent to the first region 211 on one side of the third conductive structure 223, and the other end of the third conductive structure 223 being electrically connected to a second conductive structure 222 adjacent to the first region 211 on the other side of the third conductive structure 223.

[0067] In some embodiments, along the first direction, the two ends of the base film 21 include a third region 213 and a fourth region on the same side as the first region 211; the conductive layer 22 further includes a wiring conductive structure 226 electrically connected to an external circuit, the wiring conductive structure 226 being located in the third region 213 and / or the fourth region; the wiring conductive structure 226 of the third region 213 is electrically connected to the second conductive structure 222 of the first region 211 adjacent to the third region 213, and the wiring conductive structure 226 of the fourth region is electrically connected to the first conductive structure 221 of the first region 211 adjacent to the fourth region.

[0068] In some embodiments, the width of the first conductive structure 221 and the width of the second conductive structure 222 are each independently between 30 μm and 600 μm. As an example, the width of the first conductive structure 221 can be 30 μm, 60 μm, 90 μm, 120 μm, 150 μm, 180 μm, 210 μm, 240 μm, 270 μm, 300 μm, 330 μm, 360 μm, 390 μm, 420 μm, 450 μm, 480 μm, 510 μm, 540 μm, 570 μm, 600 μm, etc., or a range consisting of any two of the above values. As an example, the width of the second conductive structure 222 can be 30μm, 60μm, 90μm, 120μm, 150μm, 180μm, 210μm, 240μm, 270μm, 300μm, 330μm, 360μm, 390μm, 420μm, 450μm, 480μm, 510μm, 540μm, 570μm, 600μm, etc., or a range consisting of any two of the above values.

[0069] In some embodiments, the spacing between the first conductive structure 221 and the second conductive structure 222 is 30 μm to 600 μm. As an example, the spacing between the first conductive structure 221 and the second conductive structure 222 can be 30 μm, 60 μm, 90 μm, 120 μm, 150 μm, 180 μm, 210 μm, 240 μm, 270 μm, 300 μm, 330 μm, 360 μm, 390 μm, 420 μm, 450 μm, 480 μm, 510 μm, 540 μm, 570 μm, 600 μm, etc., or a range consisting of any two of the above values.

[0070] In some embodiments, the conductive film 20 further includes a shielding member 40 located in a second region 212 of the base film 21, and a third conductive structure located between the base film 21 and the shielding member 40.

[0071] In some embodiments, the shielding member 40 includes one or more of an insulating film layer and an insulating coating layer.

[0072] In some embodiments, the thickness of the conductive layer 22 is 10 μm to 100 μm. As an example, the thickness of the conductive layer can be 10 μm, 20 μm, 30 μm, 40 μm, 50 μm, 60 μm, 70 μm, 80 μm, 90 μm, 100 μm, etc., or a range consisting of any two of the above values.

[0073] In some embodiments, the thickness of the base film 21 is 10 μm to 5000 μm. As an example, the thickness of the base film 21 can be 10 μm, 50 μm, 100 μm, 200 μm, 400 μm, 600 μm, 800 μm, 1000 μm, 1200 μm, 1400 μm, 1600 μm, 1800 μm, 2000 μm, 2200 μm, 2400 μm, 2600 μm, 2800 μm, 3000 μm, 3200 μm, 3400 μm, 3600 μm, 3800 μm, 4000 μm, 4200 μm, 4400 μm, 4600 μm, 4800 μm, 5000 μm, etc., or a range consisting of any two of the above values.

[0074] In some embodiments, the conductive layer 22 includes a metal foil, which includes one or more of the following: copper, copper alloy, aluminum, aluminum alloy, nickel, nickel alloy, gold, gold alloy, silver, and silver alloy.

[0075] In some embodiments, the base film 21 is flexible.

[0076] In some embodiments, the base film 21 includes at least one of polyimide, polyethylene terephthalate, polyethylene naphthalate, liquid crystal display polymer, polyolefin, and ethylene-vinyl acetate copolymer.

[0077] In some embodiments, the width of the conductive film 20 is located in the second direction, and the width of the conductive film 20 is 150mm-1400mm. As an example, the width of the conductive film 20 can be 150mm, 240mm, 340mm, 440mm, 540mm, 640mm, 740mm, 840mm, 940mm, 1040mm, 1140mm, 1240mm, 1340mm, 1400mm, etc., or a range consisting of any two of the above values.

[0078] A second aspect of this application provides a solar cell string 100. The solar cell string 100 includes a conductive film 20, a plurality of solar cells 10 located on one side of the conductive film 20 and electrically connected to the conductive film 20, and an insulating adhesive 30 connecting the conductive film 20 and the solar cells 10. Each solar cell 10 includes a cell body and an electrode layer located on one side of the cell body. The electrode layer includes a first electrode 11 and a second electrode 12 spaced apart, with opposite polarities. The conductive film 20 includes a base film 21 and a conductive layer 22 located on the side of the base film 21 facing the solar cells 10. The conductive layer 22 includes a first conductive structure 221 corresponding to and electrically connected to the first electrode 11, and a second conductive structure 222 corresponding to and electrically connected to the second electrode 12. The adhesive 30 is disposed in the area of ​​the base film 21 where the conductive layer 22 is not disposed, and the adhesive 30 is in contact with the base film 21 and the cell body. Thus, multiple solar cells 10 are connected in a string by an insulating adhesive 30 and a base film 21, and the multiple solar cells 10 are electrically connected in series by a conductive layer 22. The solar cell string 100 of this application does not require high-temperature welding, thereby reducing the risk of warping of the cells in actual use.

[0079] The following provides a further explanation of the structure and connection relationship of the solar cell 10, the conductive film 20, and the adhesive 30.

[0080] In some embodiments, the solar cell 10 includes a cell body and an electrode layer located on one side of the cell body and electrically connected to the cell body. The solar cell 10 generates photogenerated carriers within the cell body through the photoelectric effect, and these carriers are collected by the electrode layer and output.

[0081] It is understood that in this application, the main body of the battery is the portion of the solar cell 10 excluding the electrode layer. For example... Figure 2 As shown, the battery body includes a semiconductor substrate 18, a plurality of first semiconductor regions 13 and a plurality of second semiconductor regions 14 located on one side of the semiconductor substrate 18. As an example, the first semiconductor regions 13 and the second semiconductor regions 14 are alternately arranged on the surface of one side of the semiconductor substrate 18 to form an interdigitated back contact battery.

[0082] In some embodiments, the conductivity type of the first semiconductor region 13 is different from that of the semiconductor substrate 18 and the second semiconductor region 14. For example, when the conductivity type of the first semiconductor region 13 is P-type, the conductivity type of the semiconductor substrate 18 and the second semiconductor region 14 is N-type. It is understood that the semiconductor substrate 18 and the second semiconductor region 14 can be silicon semiconductors doped with N-type doped elements such as phosphorus, arsenic, or antimony; and the first semiconductor region 13 can be a silicon semiconductor doped with P-type doped elements such as boron, aluminum, or gallium.

[0083] In some embodiments, the semiconductor substrate 18, the first semiconductor region 13, and the second semiconductor region 14 may each be independently silicon semiconductors. As an example, the semiconductor substrate 18 and the second semiconductor region 14 may be phosphorus-doped silicon semiconductors, and the first semiconductor region 13 may be boron-doped silicon semiconductors.

[0084] In other embodiments, when the conductivity type of the first semiconductor region 13 is N-type, the conductivity type of the semiconductor substrate 18 and the second semiconductor region 14 is P-type.

[0085] In other embodiments, the semiconductor substrate 18, the first semiconductor region 13, and the second semiconductor region 14 may also be non-silicon semiconductors, each independently.

[0086] In some implementations, the first semiconductor region 13 and the second semiconductor region 14 are electrically isolated. For example, such as... Figure 2 As shown, the first semiconductor region 13 and the second semiconductor region 14 are spaced apart, and a trench 15 is formed between the first semiconductor region 13 and the second semiconductor region 14. The trench 15 can reduce carrier recombination losses caused by direct contact between the first semiconductor region 13 and the second semiconductor region 14. As an example, a dielectric layer can also be provided between the first semiconductor region 13 and the second semiconductor region 14. The dielectric layer has high insulation properties and can effectively electrically isolate the first semiconductor region 13 and the second semiconductor region 14.

[0087] In other embodiments, the first semiconductor region 13 and the second semiconductor region 14 are electrically coupled in a localized region. This localized region refers to a specific part or location within the battery; it can be a small portion of the battery or a specific functional area within the battery. Within this localized region, the first semiconductor region 13 and the second semiconductor region 14 can form an electrical path through direct contact or by tunneling through the dielectric layer. This allows some charge carriers to recombine at these contact points. This recombination process causes current leakage, resulting in reduced battery power generation efficiency. However, this localized leakage can be used to improve the solar cell string 100's resistance to hot spots.

[0088] In some embodiments, the first semiconductor region 13 can be polysilicon doped with N-type doped elements such as phosphorus, arsenic, or antimony, and the second semiconductor region 14 can be polysilicon doped with P-type doped elements such as boron, aluminum, or gallium. Figure 2 As shown, the battery body may further include a first interface passivation layer 16 and a second interface passivation layer 17, wherein the first interface passivation layer 16 is located between the first semiconductor region 13 and the semiconductor substrate 18, and the second interface passivation layer 17 is located between the second semiconductor region 14 and the semiconductor substrate 18. The first interface passivation layer 16 and the second interface passivation layer 17 may be made of the same type of material or different types of materials. As an example, the first interface passivation layer 16 and the second interface passivation layer 17 may each be independently made of at least one of silicon oxide, aluminum oxide, titanium oxide, silicon carbide, and amorphous silicon.

[0089] In some embodiments, the first interface passivation layer 16 and / or the second interface passivation layer 17 may be dielectric layers with tunneling effects. As an example, the first interface passivation layer 16 and the second interface passivation layer 17 may each be independently an ultrathin dielectric film with a thickness of 0.5 nm to 2 nm, wherein the thickness of the ultrathin dielectric film may be 0.5 nm, 0.7 nm, 0.9 nm, 1.1 nm, 1.3 nm, 1.5 nm, 1.7 nm, 1.9 nm, 2.0 nm, etc., or a range consisting of any two of the above values. As an example, the first interface passivation layer 16 and the second interface passivation layer 17 may also each be independently a dielectric layer with a thickness of 2 nm to 10 nm, wherein the thickness of the dielectric layer may be 2 nm, 3 nm, 4 nm, 5 nm, 6 nm, 7 nm, 8 nm, 9 nm, 10 nm, etc., or a range consisting of any two of the above values. The first interface passivation layer 16 and / or the second interface passivation layer 17 have pinholes, which can provide migration channels for charge carriers.

[0090] In other embodiments, the first semiconductor region 13 may be doped amorphous silicon doped with N-type doping elements such as phosphorus, arsenic or antimony, and the second semiconductor region 14 may be amorphous silicon doped with P-type doping elements such as boron, aluminum or gallium.

[0091] In other embodiments, the first interface passivation layer 16 and the second interface passivation layer 17 may be silicon oxide, and the first semiconductor region 13 and the second semiconductor region 14 may each be independently doped polycrystalline silicon. The battery body may also include a passivation layer located on the surface of the first semiconductor region 13 and the second semiconductor region 14 away from the semiconductor substrate 18. The passivation layer has a notch, through which the first electrode 11 and the second electrode 12 can be electrically connected to the first semiconductor region 13 and the second semiconductor region 14, respectively.

[0092] In other embodiments, the first interface passivation layer 16 and the second interface passivation layer 17 can be intrinsic amorphous silicon, the first semiconductor region 13 can be doped amorphous silicon doped with N-type doping elements such as phosphorus, arsenic or antimony, and the second semiconductor region 14 can be amorphous silicon doped with P-type doping elements such as boron, aluminum or gallium.

[0093] In other embodiments, the first semiconductor region 13 may be doped polycrystalline silicon, the second semiconductor region 14 may be doped amorphous silicon, a tunneling layer is disposed between the first semiconductor region 13 and the semiconductor substrate 18, and an intrinsic semiconductor layer is disposed between the second semiconductor region 14 and the semiconductor substrate 18. Alternatively, the second semiconductor region 14 may be doped polycrystalline silicon, the first semiconductor region 13 may be doped amorphous silicon, a tunneling layer is disposed between the second semiconductor region 14 and the semiconductor substrate 18, and an intrinsic semiconductor layer is disposed between the first semiconductor region 13 and the semiconductor substrate 18.

[0094] In some embodiments, the first electrode 11 and / or the second electrode 12 extend continuously or intermittently along a first direction, and the first electrode 11 and the second electrode 12 are arranged alternately along a second direction, wherein the first direction intersects the second direction. As an example, such as... Figure 3 As shown, the first electrode 11 and / or the second electrode 12 extend continuously along the first direction (D1) in the form of a straight line segment. As an example, such as... Figure 4 As shown, the first electrode 11 and / or the second electrode 12 extend discontinuously along the first direction, forming multiple continuous straight line segments. As an example, such as... Figure 5 As shown, the first electrode 11 and / or the second electrode 12 extend discontinuously along the first direction, forming multiple continuous points. The multiple continuous straight line segments and point-like first electrode 11 and / or second electrode 12 can save electrode material and reduce the cost of the solar cell 10.

[0095] In some implementations, such as Figures 3-5 As shown, along the second direction (D2), the spacing between adjacent first electrodes 11 and second electrodes 12 is equal. Therefore, the uniform electrode spacing reduces localized stress and thermal inhomogeneity in the battery, thereby improving battery reliability and lifespan.

[0096] In some implementations, the first direction and the second direction can be perpendicular or substantially perpendicular. "Substantially perpendicular" means that the angle between the first direction and the second direction can be 80-100 degrees, optionally 85-95 degrees, or further optionally 88-92 degrees.

[0097] In some embodiments, the first electrode 11 and the second electrode 12 have opposite polarities. For example, when the first electrode 11 is a positive electrode, the second electrode 12 is a negative electrode. For example, when the first electrode 11 is a negative electrode, the second electrode 12 is a positive electrode.

[0098] In other implementations, such as Figure 6 As shown, the first electrode 11 includes a first bus electrode 112 extending along a first direction, and a group of first finger electrodes 111 intersecting and electrically connected to the first bus electrode 112; the group of first finger electrodes 111 includes a plurality of first finger electrodes 111, which are spaced apart along the first direction. The second electrode 12 includes a second bus electrode 122 extending along the first direction, and a group of second finger electrodes 121 intersecting and electrically connected to the second bus electrode 122; the group of second finger electrodes 121 includes a plurality of second finger electrodes 121, which are spaced apart along the first direction. A first finger electrode 111 is located between two adjacent second finger electrodes 121, and a second finger electrode 121 is located between two adjacent first finger electrodes 111.

[0099] In some embodiments, the spacing between adjacent first bus electrodes 112 and second bus electrodes 122 is equal along the second direction.

[0100] In some embodiments, the spacing between adjacent first finger electrodes 111 is equal along a first direction; and / or, the spacing between adjacent second finger electrodes 121 is equal.

[0101] In some embodiments, the first bus electrode 112 and / or the second bus electrode 122 includes two sides disposed opposite each other along a second direction, and each side of the first bus electrode 112 and / or the second bus electrode 122 is independently provided with an insulating material. For example, insulating adhesive can be provided on both sides of the first bus electrode 112 and / or the second bus electrode 122 to cover the ends of the non-linear finger electrodes, thereby ensuring sufficient electrical insulation between the bus electrode and the adjacent non-linear finger electrodes and guaranteeing a stable circuit connection.

[0102] In this application, such as Figures 3-5 The solar cell 10 shown has no bus electrode, which saves electrode material and reduces the cost of the battery.

[0103] In some implementations, such as Figure 7 As shown, the solar cell string 100 includes a conductive film 20 and a plurality of solar cells 10 located on one side of the conductive film 20 and electrically connected to the conductive film 20, the plurality of solar cells 10 being arranged along a first direction. Thus, the plurality of solar cells 10 can be connected in series to form the solar cell string 100 via the conductive film 20. A single solar cell string 100 may include 2, 3, 4, 5, 6, 7, or more solar cells 10. The number of solar cells 10 can be set according to actual usage requirements.

[0104] In some embodiments, the conductive film 20 may be in the shape of a strip with a certain width and length; wherein the length is located in a first direction and the width is located in a second direction. Multiple solar cells 10 are arranged along the length direction of the conductive film 20 and are electrically connected by the conductive film 20 to form a solar cell string 100.

[0105] In some embodiments, the spacing between adjacent solar cells 10 is equal.

[0106] In some embodiments, along the first direction, the first electrode 11 of the solar cell 10 and the second electrode 12 of the adjacent solar cell 10 are collinear. Taking three adjacent solar cells 10 as an example... Figures 8-9 As shown, along the first direction, the solar cell string 100 includes three sequentially adjacent first solar cells 10a, second solar cells 10b, and third solar cells 10c. The first electrode 11 of the first solar cell 10a, the second electrode 12 of the second solar cell 10b, and the first electrode 11 of the third solar cell 10c are all on the same straight line; the second electrode 12 of the first solar cell 10a, the first electrode 11 of the second solar cell 10b, and the second electrode 12 of the third solar cell 10c are also on the same straight line.

[0107] In some embodiments, along the first direction, the first electrode 11 of the solar cell 10 is collinear with the first electrode 11 of the adjacent solar cell 10. As an example, such as... Figure 10 or Figure 11 As shown, the first electrode 11 of the first battery cell 10a, the first electrode 11 of the second battery cell 10b, and the first electrode 11 of the third battery cell 10c are on the same straight line; the second electrode 12 of the first battery cell 10a, the second electrode 12 of the second battery cell 10b, and the second electrode 12 of the third battery cell 10c are on the same straight line.

[0108] In some embodiments, the conductive film 20 includes a base film 21 and a conductive layer 22 located on the side of the base film 21 facing the solar cell 10.

[0109] In some embodiments, the base film 21 is flexible. During the lamination process of the solar cell module, the encapsulation layer is heated and pressure is applied, which causes the encapsulant to melt and apply pressure to the base film 21 toward the solar cell 10, thereby pressing the conductive layer 22 toward the electrode layer and improving the reliability of the contact between the conductive layer 22 and the electrode layer.

[0110] In some embodiments, the base film 21 may be a thin film with uniform or substantially uniform thickness.

[0111] In some embodiments, the thickness of the base film 21 is 10 μm to 5000 μm. As an example, the thickness of the base film 21 can be 10 μm, 50 μm, 100 μm, 200 μm, 400 μm, 600 μm, 800 μm, 1000 μm, 1200 μm, 1400 μm, 1600 μm, 1800 μm, 2000 μm, 2200 μm, 2400 μm, 2600 μm, 2800 μm, 3000 μm, 3200 μm, 3400 μm, 3600 μm, 3800 μm, 4000 μm, 4200 μm, 4400 μm, 4600 μm, 4800 μm, 5000 μm, etc., or a range consisting of any two of the above values. In some other embodiments of this application, the thickness of the base film 21 can be 10 μm-100 μm.

[0112] In some embodiments, the base film 21 may be an electrically insulating flexible sheet. As an example, the base film 21 includes, but is not limited to, at least one of polyimide (PI), polyethylene terephthalate (PET), polyethylene naphthalate (PEN), liquid crystal polymer (LCP), polyolefin (PO), and ethylene-vinyl acetate copolymer (EVA).

[0113] In some embodiments, the conductive layer 22 includes a metal foil, which includes, but is not limited to, one or more of the following: copper, copper alloys, aluminum, aluminum alloys, nickel, nickel alloys, gold, gold alloys, silver, and silver alloys. As an example, the conductive layer 22 can be a single-layer conductive layer, or it can be a double-layer or multi-layer conductive layer formed by stacking different conductive materials.

[0114] In some embodiments, the conductive layer 22 can be a metal foil bonded to the surface of the base film 21 by an adhesive, or it can be bonded by hot pressing, utilizing the adhesiveness generated by the base film 21 at high temperatures. The conductive layer 22 can be, for example, a flexible copper-clad laminate (FPC). The conductive layer 22 can also be deposited on the surface of the base film 21 by chemical deposition, physical deposition, electroplating, or other methods.

[0115] In some embodiments, the conductive layer 22 is patterned, for example, the conductive layer 22 can be patterned by techniques such as wet etching, laser melting, plasma etching, etc.

[0116] In some embodiments, the thickness of the conductive layer is 10μm-100μm. As an example, the thickness of the conductive layer can be 10μm, 20μm, 30μm, 40μm, 50μm, 60μm, 70μm, 80μm, 90μm, 100μm, etc., or a range consisting of any two of the above values.

[0117] In some embodiments, along a first direction, the base film 21 is divided into alternating first regions 211 and second regions 212, wherein the solar cells 10 are electrically connected to the first regions 211, and the second regions 212 are the spacing regions between adjacent solar cells 10. As an example, consider the conductive film 20 corresponding to three adjacent solar cells 10, such as... Figures 12-15 As shown, along the first direction, the base film 21 is sequentially divided into a first region 211a, a second region 212a, a first region 211b, a second region 212b, and a first region 211c. The number of first regions 211 is the same as the number of solar cells 10.

[0118] In some embodiments, the conductive layer 22 includes a first conductive structure 221 disposed corresponding to and electrically connected to the first electrode 11, and a second conductive structure 222 disposed corresponding to and electrically connected to the second electrode 12. Thus, the first conductive structure 221 and the second conductive structure 222 are located within a first region 211. The first conductive structure 221 and the second conductive structure 222 are isolated from each other within the first region 211. The shapes and arrangements of the first conductive structure 221 and the second conductive structure 222 are adapted to the shapes and arrangements of the first electrode 11 and the second electrode 12 of the solar cell 10, respectively, and the electrical functions of the first conductive structure 221 and the second conductive structure 222 are opposite.

[0119] As an example, such as Figures 12-15 As shown, the first conductive structure 221 and / or the second conductive structure 222 within each first region 211 extend continuously along a first direction, and the first conductive structure 221 and the second conductive structure 222 are arranged alternately along a second direction, with the first direction intersecting the second direction. Figures 12-15In the diagram, the first conductive structure 221 is shown in black rectangular bars, and the second conductive structure 222 is shown in gray rectangular bars.

[0120] As an example, such as Figure 8 and Figure 12 As shown, along the first direction, when the first electrode 11 of the solar cell 10 and the second electrode 12 of the adjacent solar cell 10 are on the same straight line, the first conductive structure 221 of the first region 211a, the second conductive structure 222 of the first region 211b, and the first conductive structure 221 of the first region 211c are on the same straight line; the second conductive structure 222 of the first region 211a, the first conductive structure 221 of the first region 211b, and the second conductive structure 222 of the first region 211c are on the same straight line.

[0121] like Figure 6 , Figure 9 and Figure 12 As shown, when the first electrode 11 includes a first bus electrode 112 and a first finger electrode 111, and the second electrode 12 includes a second bus electrode 122 and a second finger electrode 121, the first conductive structure 221 and the second conductive structure 222 may also include finger conductive structures to adapt to the first finger electrode 111 and the second finger electrode 121.

[0122] As an example, such as Figure 10 and Figure 13 As shown, along the first direction, when the first electrode 11 of the solar cell 10 and the first electrode 11 of the adjacent solar cell 10 are on the same straight line, the first conductive structure 221 of the first region 211a, the first conductive structure 221 of the first region 211b, and the first conductive structure 221 of the first region 211c are on the same straight line; the second conductive structure 222 of the first region 211a, the second conductive structure 222 of the first region 211b, and the second conductive structure 222 of the first region 211c are on the same straight line.

[0123] like Figure 6 , Figure 11 and Figure 13 As shown, when the first electrode 11 includes a first bus electrode 112 and a first finger electrode 111, and the second electrode 12 includes a second bus electrode 122 and a second finger electrode 121, the first conductive structure 221 and the second conductive structure 222 may also include finger conductive structures to adapt to the first finger electrode 111 and the second finger electrode 121.

[0124] In some embodiments, the conductive layer 22 further includes a third conductive structure 223; one end of the third conductive structure 223 is electrically connected to a first conductive structure 221 adjacent to a first region 211 on one side of the third conductive structure 223, and the other end of the third conductive structure 223 is electrically connected to a second conductive structure 222 adjacent to a first region 211 on the other side of the third conductive structure 223. Specifically, one end of the third conductive structure 223 is electrically connected to a first electrode 11 of a solar cell 10 adjacent to one side of the third conductive structure 223 via the first conductive structure 221, and the other end of the third conductive structure 223 is electrically connected to a second electrode 12 of a solar cell 10 adjacent to the other side of the third conductive structure 223 via the second conductive structure 222. Thus, the third conductive structure 223 connects adjacent solar cells 10 in series.

[0125] As an example, such as Figure 12 As shown, one end of the third conductive structure 223 is connected to the first conductive structure 221 of the first region 211a, and the other end of the third conductive structure 223 is connected to the second conductive structure 222 of the first region 211b. The first conductive structure 221, the third conductive structure 223 of the first region 211a, and the second conductive structure 222 of the first region 211b are on the same straight line, and the three can be integrally arranged. It can be understood that the third conductive structure 223 is located in the second region 212 of the base film 21.

[0126] As an example, such as Figure 13 As shown, one end of the third conductive structure 223 is connected to the first conductive structure 221 of the first region 211a, and the other end of the third conductive structure 223 is connected to the second conductive structure 222 of the first region 211b. The third conductive structure 223 is obliquely intersecting the first conductive structure 221 and the second conductive structure 222 connected to it. The first conductive structure 221, the third conductive structure 223 of the first region 211a, and the second conductive structure 222 of the first region 211b can be integrally formed.

[0127] In other embodiments, the conductive layer 22 further includes a bus conductive structure 224. For example... Figure 14 and Figure 15As shown, the busbar conductive structure 224 can be located within the second region 212a and the second region 212b, and the busbar conductive structure 224 extends along the second direction. Specifically, the first conductive structure 221 of the first region 211a extends to the busbar conductive structure 224 and intersects with it; the second conductive structure 222 of the first region 211b extends to the busbar conductive structure 224 and intersects with it. In this case, the first conductive structure 221 and the second conductive structure 222, which are interconnected in the first region 211a and the second region 212b, are both connected to the busbar conductive structure 224. Thus, the busbar conductive structure 224 connects adjacent solar cells 10 in series.

[0128] In some embodiments, the conductive layer 22 further includes a wiring conductive structure 226. Along a first direction, the base film 21 is divided into a third region 213 and a fourth region at both ends, and the wiring conductive structure 226 is located in the third region 213 and the fourth region. When the first conductive structure 221 of the first region 211 is electrically connected to the second conductive structure 222 of the adjacent first region 211, the wiring conductive structure 226 of the third region 213 is electrically connected to the second conductive structure 222 of the adjacent first region 211, and the wiring conductive structure 226 of the fourth region is electrically connected to the first conductive structure 221 of the adjacent first region 211. The wiring conductive structure 226 is used for connecting an external circuit to draw out the current generated by a single solar cell string 100.

[0129] As an example, such as Figures 13-15 As shown, along the first direction, one end of the base film 21 includes a third region 213, which is adjacent to the first region 211a. When the first conductive structure 221 of the first region 211a is electrically connected to the second conductive structure 222 of the first region 211b, the wiring conductive structure 226 of the third region 213 is electrically connected to the second conductive structure 222 of the first region 211a. Optionally, the wiring conductive structure 226 of the third region 213 is integrally formed with the second conductive structure 222 of the first region 211a.

[0130] In some embodiments, the solar cell string 100 includes an adhesive 30, which is insulating. The adhesive 30 is disposed in the area of ​​the base film 21 where the conductive layer 22 is not provided, and the adhesive 30 is in contact with the base film 21 and the cell body. Thus, the conductive film 20 and the plurality of solar cells 10 are bonded together as a whole by the adhesive 30.

[0131] In some embodiments, the conductive layer 22 and the electrode layer are electrically connected via a contact connection. For example... Figure 16As shown, under the action of the adhesive 30, the first conductive structure 221 and the first electrode 11 can form an electrical connection through contact only; and / or, the second conductive structure 222 and the second electrode 12 can form an electrical connection through contact only. It is understood that forming an electrical connection through contact can mean that the first conductive structure 221 and the second conductive structure 222 directly and physically contact the first electrode 11 and the second electrode 12, respectively. Therefore, the solar cell string 100 of this application does not have solder joints, bonds, or intermediate conductive connectors.

[0132] In other embodiments, the conductive layer 22 and the electrode layer can also be electrically connected through conductive contacts 225. For example... Figure 17 As shown, the first conductive structure 221 is electrically connected to the first electrode 11 through conductive contact 225; and / or, the second conductive structure 222 is electrically connected to the second electrode 12 through conductive contact 225. The conductive contact 225 can be formed between the conductive layer 22 and the electrode layer using methods such as laser welding, ultrasonic welding, thermal infrared welding, or resistance heating welding. Alternatively, a conductive adhesive can be applied between the conductive layer 22 and the electrode layer to form the conductive contact 225. The conductive adhesive can be ECA, solder paste, etc. Using methods such as laser welding, ultrasonic welding, or conductive adhesives allows the solar cells 10 to be connected in series at a lower temperature, thus reducing the warpage of the solar cells 10.

[0133] In some embodiments, the width of the first conductive structure 221 is greater than or equal to the width of the first electrode 11; and / or, the width of the second conductive structure 222 is greater than or equal to the width of the second electrode 12.

[0134] In some embodiments, the width of the first conductive structure 221 and the width of the second conductive structure 222 are each independently between 30 μm and 600 μm. As an example, the width of the first conductive structure 221 can be 30 μm, 60 μm, 90 μm, 120 μm, 150 μm, 180 μm, 210 μm, 240 μm, 270 μm, 300 μm, 330 μm, 360 μm, 390 μm, 420 μm, 450 μm, 480 μm, 510 μm, 540 μm, 570 μm, 600 μm, etc., or a range consisting of any two of the above values. As an example, the width of the second conductive structure 222 can be 30μm, 60μm, 90μm, 120μm, 150μm, 180μm, 210μm, 240μm, 270μm, 300μm, 330μm, 360μm, 390μm, 420μm, 450μm, 480μm, 510μm, 540μm, 570μm, 600μm, etc., or a range consisting of any two of the above values.

[0135] In some embodiments, when the first electrode 11 includes a first finger electrode 111 and a first bus electrode 112, and the second electrode 12 includes a second finger electrode 121 and a second bus electrode 122, the widths of the first finger electrode 111 and the second finger electrode 121 are independently 5μm-50μm. As an example, the width of the first finger electrode 111 can be 5μm, 10μm, 15μm, 20μm, 25μm, 30μm, 35μm, 40μm, 45μm, 50μm, etc., or a range consisting of any two of the above values. As an example, the width of the second finger electrode 121 can be 5μm, 10μm, 15μm, 20μm, 25μm, 30μm, 35μm, 40μm, 45μm, 50μm, etc., or a range consisting of any two of the above values.

[0136] In some embodiments, the widths of the first bus electrode 112 and the second bus electrode 122 are independently 30 μm to 600 μm. As an example, the width of the first bus electrode 112 can be 30 μm, 60 μm, 90 μm, 120 μm, 150 μm, 180 μm, 210 μm, 240 μm, 270 μm, 300 μm, 330 μm, 360 μm, 390 μm, 420 μm, 450 μm, 480 μm, 510 μm, 540 μm, 570 μm, 600 μm, etc., or a range consisting of any two of the above values. As an example, the width of the second bus electrode 122 can be 30μm, 60μm, 90μm, 120μm, 150μm, 180μm, 210μm, 240μm, 270μm, 300μm, 330μm, 360μm, 390μm, 420μm, 450μm, 480μm, 510μm, 540μm, 570μm, 600μm, etc., or a range consisting of any two of the above values.

[0137] In some embodiments, the spacing between the first conductive structure 221 and the second conductive structure 222 is 30 μm to 600 μm. As an example, the spacing between the first conductive structure 221 and the second conductive structure 222 can be 30 μm, 60 μm, 90 μm, 120 μm, 150 μm, 180 μm, 210 μm, 240 μm, 270 μm, 300 μm, 330 μm, 360 μm, 390 μm, 420 μm, 450 μm, 480 μm, 510 μm, 540 μm, 570 μm, 600 μm, etc., or a range consisting of any two of the above values.

[0138] In some implementations, such as Figures 16-17As shown, the first electrode 11, the second electrode 12 adjacent to the first electrode 11, the battery body, the first conductive structure 221, the second conductive structure 222 adjacent to the first conductive structure 221, and the base film 21 form a receiving space, and the adhesive 30 is located in the receiving space.

[0139] In some embodiments, the adhesive elements 30 within a single receiving space are arranged continuously or at intervals. For example, Figure 18 As shown, the adhesive 30 can be disposed in the entire area of ​​the same accommodating space. Figure 18 (Only the area of ​​the housing space facing the battery body is shown in the image). As an example, such as... Figure 19 As shown, the adhesive 30 can also be disposed in a local area of ​​the same receiving space. Figure 19 Only the area of ​​the housing facing the battery body is shown in the image.

[0140] In some embodiments, the adhesive 30 has a first contact surface with the base film 21, and the conductive layer 22 has a second contact surface with the electrode layer. The distance between the first contact surface and the battery body is less than or equal to the sum of the distance between the second contact surface and the battery body and the thickness of the conductive layer. This facilitates good physical contact between the conductive layer 22 and the electrode layer. It is understood that the reference plane used for measuring both the distance between the first contact surface and the battery body, and the distance between the second contact surface and the battery body, is the same and consistent.

[0141] As an example, the minimum distance between the first contact surface and the semiconductor substrate 18 is less than or equal to the sum of the minimum distance between the second contact surface and the semiconductor substrate 18 and the thickness of the conductive layer 22.

[0142] Specifically, since the electrode layer includes a first electrode 11 and a second electrode 12 arranged at intervals, and the first electrode 11 and the second electrode 12 are usually fabricated separately during the fabrication of the solar cell 10, the thickness of the first electrode 11 and the thickness of the second electrode 12 may be different, resulting in different distances between the second contact surfaces corresponding to the first electrode 11 and the second electrode 12 and the battery body. In this application, the distance between the second contact surface and the battery body is selected as the minimum distance between the second contact surfaces corresponding to the first electrode 11 and the second electrode 12 and the battery body.

[0143] In some embodiments, the adhesive 30 has a first contact surface with the base film 21, and the conductive layer 22 has a third contact surface with the base film 21. The distance between the first contact surface and the battery body is less than or equal to the distance between the third contact surface and the battery body. This facilitates good physical contact between the conductive layer 22 and the electrode layer. It is understood that the reference plane used for measuring both the distance between the first contact surface and the battery body, and the distance between the third contact surface and the battery body, is the same and consistent.

[0144] In some implementations, such as Figure 16 As shown, the base film 21, on which the adhesive 30 is disposed, has a protruding structure 214 facing the battery body. Thus, the protruding structure 214 of the base film 21 presses the conductive layer 22 against the electrode layer of the solar cell 10, thereby forming a good conductive contact between the conductive layer 22 and the electrode layer.

[0145] In some embodiments, the base film 21 extends across the boundary of the first electrode 11 and / or the second electrode 12 of the solar cell 10 and contacts the adhesive 30 at an angle toward the solar cell 10, so that the base film 21 presses the conductive layer 22 toward the electrode layer of the solar cell 10, thereby forming a good physical contact between the conductive layer 22 and the electrode layer.

[0146] In some embodiments, the adhesive 30 includes at least one of epoxy resin cured material, silicone cured material, acrylic resin cured material, polyurethane cured material, and hot melt adhesive cured material. Therefore, the raw material corresponding to the adhesive 30 can be at least one of epoxy adhesive, silicone adhesive, acrylic adhesive, and polyurethane adhesive. During the curing process, these raw materials shrink in volume, thereby moving the base film 21 toward the solar cell 10, pressing the conductive layer 22 against the electrode layer, and forming good physical contact between the conductive layer 22 and the electrode layer.

[0147] In some embodiments, the raw material of the adhesive 30 may be in a fluid state before curing and can be applied to the solar cell 10 by printing or printing. For example, the raw material of the adhesive 30 may be epoxy resin, silicone resin, acrylic resin, or polyurethane resin.

[0148] In some embodiments, the raw material of the adhesive 30 may be solid before curing. When applying the raw material of the adhesive 30, it is necessary to use equipment to heat the raw material of the adhesive 30 in real time to make the raw material of the adhesive 30 flowable. For example, the raw material of the adhesive 30 may be a hot melt adhesive.

[0149] In some embodiments, the adhesive 30 has a positive curing volume shrinkage rate. Specifically, the raw materials of the adhesive 30 (such as epoxy resin, silicone resin, acrylic resin, polyurethane resin) gradually shrink in volume during the curing process, exhibiting a positive curing volume shrinkage rate, thereby obtaining an adhesive 30 with a positive curing volume shrinkage rate.

[0150] In some embodiments, the adhesive 30 is elastic. Thus, during the lamination process of the solar cell module, the encapsulation layer is heated and pressure is applied, causing the encapsulant to melt and exert pressure on the flexible base film 21 towards the solar cell 10. At this time, the adhesive 30 can be compressed, causing the area of ​​the base film 21 without the conductive layer 22 to shift slightly towards the solar cell 10 by a greater distance than the area of ​​the base film 21 with the conductive layer 22. This displacement difference helps maintain good conductive contact between the conductive layer 22 and the electrode layer. After the encapsulant cures, the pressure on the portion of the base film 21 without the conductive layer 22 is maintained, ensuring that the conductive layer 22 and the electrode layer maintain good conductive contact throughout.

[0151] During the formation of the adhesive 30, the raw material for the adhesive 30 can be pre-placed on the surface of the base film 21, specifically in all or part of the spacer area between the first conductive structure 221 and the second conductive structure 222. The raw material for the adhesive 30 can also be pre-placed on the surface of the battery body, specifically in all or part of the spacer area between the first electrode 11 and the second electrode 12. The raw material for the adhesive 30 can also be simultaneously placed on both the surface of the base film 21 and the surface of the battery body. However, the amount of raw material applied for the adhesive 30 should be appropriate. The raw material of the adhesive 30 is fluid in the initial stage of curing; excess raw material can easily flow between the electrode layer and the conductive layer 22, affecting the conductivity between the electrode layer and the conductive layer 22.

[0152] In some embodiments, the adhesive 30 can serve as an electrical insulating medium between the first electrode 11 and the second electrode 12, and between the first conductive structure 221 and the second conductive structure 222, to reduce the risk of leakage in the solar cell string 100.

[0153] In this application, the process of forming the solar cell string 100 can be as follows: First, the raw material of the adhesive 30 is coated in the area between the first electrode 11 and the second electrode 12 of the solar cell 10. Then, the first electrode 11 of the multiple solar cells 10 is aligned with the first conductive structure 221 of the corresponding area, and the second electrode 12 is aligned with the second conductive structure 222 of the corresponding area. After the raw material of the adhesive 30 is cured, the conductive film 20 and the multiple solar cells 10 form a whole, which is the solar cell string 100.

[0154] In a third aspect, this application provides a solar cell module including a plurality of solar cell strings 100 arranged at intervals according to the second aspect of this application.

[0155] In some implementations, such as Figure 1 As shown, multiple solar cell strings are arranged at intervals along the first direction and / or the second direction.

[0156] In some embodiments, the conductive film 20 may be in the shape of a strip with a certain width and length; wherein the length is located in a first direction and the width is located in a second direction. Multiple solar cells 10 are arranged along the length of the conductive film 20 and electrically connected by the conductive film 20 to form a solar cell string 100. The width of the conductive film 20 may be less than or equal to the length of the solar cell 10 along the second direction. Thus, the long side of the conductive film 20 can be hidden on the rear surface of the solar cell 10 (in the solar cell 10, the incident surface of light is defined as the front surface), thereby reducing the exposed portion of the conductive film 20 between the solar cell strings 100 and minimizing its adverse effect on the appearance of the solar cell module.

[0157] In some embodiments, the width of the conductive film 20 is 150mm-1400mm. For example, the width of the conductive film 20 can be 150mm, 240mm, 340mm, 440mm, 540mm, 640mm, 740mm, 840mm, 940mm, 1040mm, 1140mm, 1240mm, 1340mm, 1400mm, etc., or a range consisting of any two of the above values.

[0158] In other embodiments, the solar cells 10 are arranged in a rectangular array on the conductive film 20, and all solar cells 10 are electrically connected to the conductive film 20. In this case, the conductive film 20 can be module-level, and its length and width can substantially cover the array of solar cells 10. All solar cells 10 in the solar cell module are attached to the conductive film 20. The conductive layer 22 of the conductive film 20 can connect these solar cells 10 in series to form several solar cell strings 100.

[0159] In some embodiments, the solar cell module further includes a plurality of busbars 600, which are electrically connected to the positive terminal of a solar cell string 100 and the negative terminal of an adjacent solar cell string 100 to connect the individual solar cell strings 100 in series; and / or, the busbars 600 are electrically connected to the positive terminal of a solar cell string 100 and the positive terminal of an adjacent solar cell string 100 to connect the individual solar cell strings 100 in parallel.

[0160] In some embodiments, the busbar 600 is electrically connected to the wiring conductive structure 226 of the solar cell string 100. Specifically, the busbar 600 is electrically connected to the wiring conductive structure 226 electrically connected to the first conductive structure 221 of the solar cell string 100, and electrically connected to the wiring conductive structure 226 electrically connected to the second conductive structure 222 of the adjacent solar cell string 100; and / or, the busbar is electrically connected to the wiring conductive structure 226 electrically connected to the first conductive structure 221 of the solar cell string 100, and electrically connected to the wiring conductive structure 226 electrically connected to the first conductive structure 221 of the adjacent solar cell string 100.

[0161] like Figure 24 As shown, along the first direction, the busbar 600 includes end busbars 600 (such as busbar 600a and busbar 600c) and middle busbars 600 (such as busbar 600b) distributed at both ends of the solar cell module, with the first battery string group 1 and the second battery string group 2 on both sides of the middle busbar 600 respectively.

[0162] The first battery string group 1 is connected in series with the end busbar 600 and the middle busbar 600 at one end of the solar cell module. The second battery string group 2 is connected in series with the end busbar 600 and the middle busbar 600 at the other end of the solar cell module. At the same time, the middle busbar 600 also connects the first battery string group 1 and the second battery string group 2 in parallel.

[0163] As an example, such as Figure 24 As shown, the solar cell module includes a first battery string group 1, which includes multiple solar cell strings 100 spaced apart along a second direction. The positive terminal of each solar cell string 100 is electrically connected to the negative terminal of the adjacent solar cell string 100 via a busbar 600. Thus, the first battery string group 1 forms a complete current loop, allowing the multiple solar cell strings 100 to be connected in series. Specifically, the first battery string group 1 includes solar cell strings 100a, 100b, 100c, 100d, 100e, and 100f spaced apart sequentially along the second direction. Busbar 600a electrically connects the positive terminal of solar cell string 100a to the negative terminal of solar cell string 100b, busbar 600b electrically connects the positive terminal of solar cell string 100b to the negative terminal of solar cell string 100c, busbar 600c electrically connects the positive terminal of solar cell string 100c to the negative terminal of solar cell string 100d, and so on; other connection relationships are not described further. Thus, multiple solar cell strings 100 in the first battery string group 1 are connected in series.

[0164] As an example, the solar cell module may also include a second battery string group 2, and the series connection of the solar cell strings 100 in the second battery string group 2 is the same as that in the first battery string group 1.

[0165] In some implementations, such as Figure 21 and Figure 22 As shown, the busbar 600 is located on the side of the conductive film 20 facing the solar cell 10, that is, the busbar 600 is on the same side as the solar cell 10. As an example, such as... Figure 22 As shown, the base film 21 at the position corresponding to the wiring conductive structure 226 of the conductive film 20 can be omitted.

[0166] In some implementations, such as Figure 23 As shown, the busbar 600 is located on the side of the conductive film 20 away from the solar cell 10, meaning the busbar 600 can also be on a different side from the solar cell 10. In this case, the busbar 600 is hidden on the rear surface of the solar cell 10 (in the solar cell 10, the incident surface of light is defined as the front surface), which can reduce the area of ​​the non-power-generating region of the solar cell module and improve the energy conversion efficiency of the solar cell module.

[0167] As an example, along the first direction, the orthographic projection of the base film 21 onto the solar cell string 100 lies within the end solar cell 10 of the solar cell string 100. Figure 23 As shown, taking one end of the solar cell string 100 as an example, the conductive wiring structure 226 has a bend, which is located on the surface of the base film 21 facing away from the solar cell 10. The busbar 600 is electrically connected to the bend of the conductive wiring structure 226. Specifically, the busbar 600 is located on the surface of the conductive wiring structure 226 facing away from the base film 21. Thus, the busbar 600 can be hidden on the rear surface of the solar cell 10.

[0168] In some embodiments, the solar cell module further includes a string of solar cells 100 having a shielding member 40. The shielding member 40 is located at least in the area of ​​the base film 21 facing the solar cells 10 and where no solar cells 10 are disposed. Since there are gaps between the solar cells 10, the conductive film 20 can be seen through the gaps on the front side of the solar cell module. The shielding member 40 can block the color of the base film 21 and the conductive layer 22 in the gaps between adjacent solar cells 10, thereby optimizing the local color of the solar cell module.

[0169] As an example, such as Figure 12 , Figure 20 As shown, the shielding member 40 can be disposed in the second region 212 of the conductive film 20, and the third conductive structure 223 is located between the base film 21 and the shielding member 40.

[0170] As an example, the shielding member 40 may be a film attached to the conductive film 20 or a coating applied to the conductive film 20. The film or coating is insulating.

[0171] As an example, the color of the masking member 40 includes black.

[0172] In some embodiments, for the module-level conductive film 20, the gap between adjacent solar cell strings 100 may also expose the conductive film 20, so a shielding member 40 can also be provided between adjacent solar cell strings 100.

[0173] In some embodiments, the solar cell module further includes an encapsulation layer located on at least one side of the plurality of solar cell strings 100. For example... Figure 1 As shown, encapsulation layers are provided on both sides of the multiple solar cell strings 100. Specifically, the encapsulation layer located on one side of the multiple solar cell strings 100 is referred to as the first encapsulation layer 400; the encapsulation layer located on the other side of the multiple solar cell strings 100 is referred to as the second encapsulation layer 500. The solar cell strings 100 can be enclosed in the encapsulation layers, which can block moisture, oxygen, and other substances that are harmful to the solar cells 10 and the connecting circuits.

[0174] As an example, the first encapsulation layer 400 and the second encapsulation layer 500 may each be independently at least one selected from ethylene vinyl acetate copolymer (EVA), polyvinyl butyral, silicone resin, ester resin, and olefin resin. The embodiments of this disclosure are not limited to these materials.

[0175] In some embodiments, if light enters the solar cell 10 from the direction of the first encapsulation layer 400, the conductive film 20 is located between the plurality of solar cells 10 and the second encapsulation layer 500. The first encapsulation layer 400 is a light-transmitting material to allow light to reach the solar cell 10. The second encapsulation layer 500 can be a light-transmitting material or a non-light-transmitting material.

[0176] In some embodiments, the solar cell module also includes a cover plate located on the side of the encapsulation layer away from the plurality of solar cell strings 100. The cover plate protects the solar cells 10. Figure 1 As shown, the cover plate located on the side of the first encapsulation layer 400 away from the multiple solar cell strings 100 is designated as the first cover plate 200, and the cover plate located on the side of the second encapsulation layer 500 away from the multiple solar cell strings 100 is designated as the second cover plate 300.

[0177] In some embodiments, if light enters the solar cell 10 from the direction of the first cover plate 200, the first cover plate 200 is a light-transmitting material to allow light to reach the solar cell 10. The second cover plate 300 can be a light-transmitting material or a non-light-transmitting material. The light-transmitting material can be glass, a sheet or film made of light-transmitting resin, a flexible layer woven from light-transmitting fibers, etc. The non-light-transmitting material can be of the Tedlar / PET / Tedlar (TPT) type or can have a structure in which polyvinylidene fluoride (PVDF) resin is formed on at least one surface of polyethylene terephthalate (PET).

[0178] In some embodiments, the solar cell module sequentially includes a first cover plate 200, a first encapsulation layer 400, multiple solar cell strings 100, a second encapsulation layer 500, and a second cover plate 300. These layered structures can be encapsulated together using a lamination process. Frame ( Figure 1 (Not shown) is constructed in a shape that surrounds the solar cell module to provide structural protection for the laminate.

[0179] In a fourth aspect, this application provides a power generation device, including the solar cell module of the third aspect of this application. Using the aforementioned solar cell module, the power generation device has high energy conversion efficiency and can be used in applications requiring conductivity.

[0180] In a fifth aspect, this application provides an electrical device including a solar cell module as described in the third aspect of this application. The solar cell module can be used as a power source for the electrical device or as an energy storage unit. The electrical device can be, but is not limited to, mobile devices (e.g., mobile phones, laptops, etc.), electric vehicles (e.g., pure electric vehicles, hybrid electric vehicles, plug-in hybrid electric vehicles, electric bicycles, electric scooters, electric golf carts, electric trucks, etc.), electric trains, ships and satellites, energy storage systems, etc. As an example, the electrical device can be a pure electric vehicle, a hybrid electric vehicle, or a plug-in hybrid electric vehicle, etc. The electrical device includes a solar cell module. As an example, the electrical device can be a mobile phone, tablet computer, laptop computer, etc.

[0181] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A conductive film for interconnecting solar cells, characterized in that, include: A base film, one side of which includes a plurality of first regions spaced apart along a first direction; A conductive layer includes a first conductive structure and a second conductive structure spaced apart, the first conductive structure and the second conductive structure being located in the first region of the base film; the first conductive structure and the second conductive structure are respectively electrically connected to the opposite electrode of the solar cell; The first conductive structure in the first region is electrically connected to the second conductive structure in the adjacent first region.

2. The conductive film for interconnecting solar cells according to claim 1, characterized in that, The first conductive structure and / or the second conductive structure in each of the first regions extend continuously along the first direction, and the first conductive structure and the second conductive structure are arranged alternately along the second direction, wherein the first direction intersects the second direction.

3. The conductive film for interconnecting solar cells according to claim 2, characterized in that, The base film further includes a second region, which is located between adjacent first regions; The conductive layer further includes a third conductive structure located in the second region. One end of the third conductive structure is electrically connected to the first conductive structure in the first region adjacent to one side of the third conductive structure, and the other end of the third conductive structure is electrically connected to the second conductive structure in the first region adjacent to the other side of the third conductive structure.

4. The conductive film for interconnecting solar cells according to claim 3, characterized in that, Along the first direction, the two ends of the base film include a third region and a fourth region on the same side as the first region; The conductive layer further includes a wiring conductive structure electrically connected to an external circuit, the wiring conductive structure being located in the third region and / or the fourth region; The wiring conductive structure in the third region is electrically connected to the second conductive structure in the first region adjacent to the third region, and the wiring conductive structure in the fourth region is electrically connected to the first conductive structure in the first region adjacent to the fourth region.

5. The conductive film for interconnecting solar cells according to any one of claims 1-4, characterized in that, The widths of the first conductive structure and the second conductive structure are independently 30 μm-600 μm; and / or, The distance between the first conductive structure and the second conductive structure is 30μm-600μm.

6. The conductive film for interconnecting solar cells according to any one of claims 3-4, characterized in that, It also includes a shielding member located in the second region of the base film, and the third conductive structure located between the base film and the shielding member; Optionally, the shielding member includes one or more of an insulating film layer and an insulating coating layer.

7. The conductive film for interconnecting solar cells according to any one of claims 1-4, characterized in that, The thickness of the conductive layer is 10μm-100μm; and / or, The thickness of the base film is 10μm-5000μm.

8. The conductive film for interconnecting solar cells according to any one of claims 1-4, characterized in that, The conductive layer is a metal foil, which is made of copper, copper alloy, aluminum, aluminum alloy, nickel, nickel alloy, gold, gold alloy, silver, or silver alloy.

9. The conductive film for interconnecting solar cells according to any one of claims 1-4, characterized in that, The base membrane is flexible; Optionally, the base film is polyimide, polyethylene terephthalate, polyethylene naphthalate, liquid crystal display polymer, polyolefin, or ethylene-vinyl acetate copolymer.

10. The conductive film for interconnecting solar cells according to any one of claims 2-4, characterized in that, The width of the conductive film is located in the second direction, and the width of the conductive film is 150mm-1400mm.

11. A solar cell string, characterized in that, Includes the conductive film for interconnecting solar cells as described in any one of claims 1-10.

12. A solar cell module, characterized in that, It includes multiple solar cell strings as described in claim 11, arranged at intervals.

13. A power generation device, characterized in that, Includes the solar cell module as described in claim 12.

14. An electrical appliance, characterized in that, Includes the solar cell module as described in claim 12.

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