Solar cell without bus electrode, solar cell string without bus electrode, solar cell module, power generation equipment and electric equipment

Abstract

The utility model discloses a solar cell without a bus electrode, a solar cell string without a bus electrode, a solar cell module, power generation equipment and electric equipment. The solar cell string comprises a plurality of solar cells, each solar cell comprises a cell body and an electrode layer located on one side of the cell body, and each electrode layer comprises a first electrode and a second electrode which are opposite in polarity. The first electrodes and / or the second electrodes extend along a first direction, and the first electrodes and the second electrodes are alternately arranged at intervals along a second direction intersected with the first direction; the conductive interconnection film comprises a base film and a conductive layer located on the side, facing the solar cell, of the base film. The conductive layer comprises a first conductive structure electrically connected with the first electrode and a second conductive structure electrically connected with the second electrode; the adhesive body having an insulating property is provided in a region of the base film where the conductive layer is not provided, and the adhesive body is in contact with the base film and the cell main body. According to the invention, the plurality of solar cells are connected into a string through the bonding body, so that the risk of warping of the cells in actual use is reduced.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of batteries, and in particular, relates to a solar cell without a busbar electrode, a solar cell string without a busbar electrode, a solar cell module, a power generation device, and a power consumption device. BACKGROUND

[0002] A solar cell is a kind of semiconductor device that converts light energy into electrical energy. Higher application reliability, lower production cost, and higher energy conversion efficiency have always been the goals pursued by the solar cell industry. After the preparation of a solar cell is completed, various interconnection technologies are needed to connect the solar cells into a solar cell string, and then to realize application. However, the interconnection technology of the solar cell string still needs to be further improved. CONTENT OF THE UTILITY MODEL

[0003] In view of the technical problems in the background art, the first aspect of the present application provides a solar cell string without a busbar electrode, comprising: a plurality of solar cells arranged along a first direction, the solar cell comprising: a cell body, and an electrode layer located on one side of the cell body, the electrode layer comprising a first electrode and a second electrode, the polarities of the first electrode and the second electrode being opposite; the first electrode and / or the second electrode continuously extends or intermittently extends along the first direction, and the first electrode and the second electrode are alternately and spacedly arranged along a second direction, the first direction intersecting the second direction; a conductive interconnection film, a plurality of the solar cells being located on one side of the conductive interconnection film, the conductive interconnection film electrically connecting a plurality of the solar cells; the conductive interconnection film comprising: a base film, and a conductive layer located on the side of the base film facing the solar cell; the conductive layer comprising: a first conductive structure corresponding to and electrically connected to the first electrode, and a second conductive structure corresponding to and electrically connected to the second electrode; an adhesive body, the adhesive body having insulation, the adhesive body being arranged in the region of the base film where the conductive layer is not arranged, the adhesive body being in contact with the base film and the cell body.

[0004] Thus, the plurality of solar cells are connected into a string by the adhesive body and the base film having insulation, and the plurality of solar cells are electrically connected in series by the conductive layer. The solar cell string of the present application does not need to be subjected to high-temperature welding processing, so as to reduce the risk of warping of the battery in actual use.

[0005] In some embodiments, the adhesive body and the base film have a first contact surface, the conductive layer and the electrode layer have a second contact surface, and the distance between the first contact surface and the cell body is less than or equal to the sum of the distance between the second contact surface and the cell body and the thickness of the conductive layer.

[0006] In some embodiments, the adhesive body has a positive volume shrinkage upon curing.

[0007] In some embodiments, the adhesive body is an epoxy cured product, a silicone cured product, an acrylic cured product, a polyurethane cured product, or a hot melt adhesive cured product.

[0008] In some embodiments, the adhesive body has elasticity.

[0009] In some embodiments, the base film is disposed across the boundary of the first electrode and / or the second electrode of the solar cell and contacts the adhesive body obliquely toward the solar cell.

[0010] In some embodiments, the base film disposed with the adhesive body on the surface has a protruding structure toward the solar cell body.

[0011] In some embodiments, the base film has flexibility.

[0012] In some embodiments, the base film has a thickness of 10 μm to 5000 μm.

[0013] In some embodiments, the base film is polyimide, polyethylene terephthalate, polyethylene naphthalate, liquid crystal display polymer, polyolefin, or ethylene-vinyl acetate copolymer.

[0014] In some embodiments, the first electrode, the second electrode adjacent to the first electrode, the solar cell body, the first conductive structure, the second conductive structure adjacent to the first conductive structure, and the base film form a containing space, and the adhesive body is disposed in the containing space.

[0015] In some embodiments, the adhesive bodies in the single containing space are disposed continuously or at intervals.

[0016] In some embodiments, the plurality of solar cells are arranged in a first direction, the first electrode and / or the second electrode continuously extend or discontinuously extend in the first direction, and the first electrode and the second electrode are alternately arranged at intervals in a second direction, and the first direction intersects the second direction.

[0017] In some embodiments, the width of the first conductive structure is greater than or equal to the width of the first electrode.

[0018] In some embodiments, the width of the second conductive structure is greater than or equal to the width of the second electrode.

[0019] In some embodiments, the width of the first conductive structure and the width of the second conductive structure are independently 30 μm to 600 μm, respectively.

[0020] In some embodiments, the width of the first electrode and the width of the second electrode are independently 5 μm-50 μm.

[0021] In some embodiments, the electrically conductive layer and the electrode layer form the electrical connection through a contact connection.

[0022] In some embodiments, the electrically conductive layer and the electrode layer form the electrical connection through a conductive contact.

[0023] In some embodiments, the first electrically conductive structure and the first electrode form the electrical connection through a contact connection.

[0024] In some embodiments, the first electrically conductive structure and the first electrode form the electrical connection through a conductive contact.

[0025] In some embodiments, the second electrically conductive structure and the second electrode form the electrical connection through a contact connection.

[0026] In some embodiments, the second electrically conductive structure and the second electrode form the electrical connection through a conductive contact.

[0027] In some embodiments, the electrically conductive layer further comprises a third electrically conductive structure; one end of the third electrically conductive structure is electrically connected to the first electrode of the solar cell through the first electrically conductive structure adjacent to one side of the third electrically conductive structure, and the other end of the third electrically conductive structure is electrically connected to the second electrode of the solar cell through the second electrically conductive structure adjacent to the other side of the third electrically conductive structure.

[0028] In a second aspect of the present application, a solar cell module is provided, comprising a plurality of the solar cell strings without busbars of the first aspect of the present application arranged at intervals.

[0029] In some embodiments, the solar cell module further comprises:

[0030] an encapsulation layer, the encapsulation layer being located on at least one side of the plurality of the solar cell strings;

[0031] a cover plate, the cover plate being located on a side of the encapsulation layer away from the plurality of the solar cell strings.

[0032] In a third aspect of the present application, a power generation device is provided, comprising the solar cell module of the second aspect of the present application.

[0033] In a fourth aspect of the present application, an electrical equipment is provided, comprising the solar cell module of the second aspect of the present application.

[0034] In a fifth aspect of the present application, the present application provides a solar cell without busbar, comprising a cell body, and an electrode layer on one side of the cell body, wherein the electrode layer comprises a first electrode and a second electrode, the first electrode and the second electrode have opposite polarity; the first electrode and / or the second electrode continuously or discontinuously extends along a first direction, and the first electrode and the second electrode are alternately arranged along a second direction, the first direction intersects the second direction.

[0035] In some embodiments, the width of the first electrode and the width of the second electrode are independently 5 μm-50 μm. BRIEF DESCRIPTION OF DRAWINGS

[0036] The above and / or additional aspects and advantages of the present application will become apparent and more readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings in which:

[0037] Figure 1 is an exploded schematic view of a solar cell module in an embodiment of the present application.

[0038] Figure 2 is a sectional view of a solar cell in an embodiment of the present application.

[0039] Figure 3 is a schematic view of electrode layer distribution of a solar cell in an embodiment of the present application.

[0040] Figure 4 is a schematic view of electrode layer distribution of a solar cell in another embodiment of the present application.

[0041] Figure 5 is a schematic view of electrode layer distribution of a solar cell in another embodiment of the present application.

[0042] Figure 6 is a schematic view of a solar cell string in an embodiment of the present application.

[0043] Figure 7 is a schematic view of arrangement of a plurality of solar cells in an embodiment of the present application.

[0044] Figure 8 is a schematic view of arrangement of a plurality of solar cells in another embodiment of the present application.

[0045] Figure 9 is a schematic view of structure of a conductive interconnection film in an embodiment of the present application.

[0046] Figure 10 is a schematic view of structure of a conductive interconnection film in another embodiment of the present application.

[0047] Figure 11 is a schematic view of structure of a conductive interconnection film in another embodiment of the present application.

[0048] Figure 12 is a structural diagram of the conductive interconnection film in another embodiment of the present application.

[0049] Figure 13 is a cross-sectional view of the solar cell string A-A cross-sectional line shown in one embodiment of the present application. Figure 6

[0050] Figure 14 is a cross-sectional view of the solar cell string A-A cross-sectional line shown in another embodiment of the present application. Figure 6

[0051] Figure 15 is a distribution diagram of the adhesive in one embodiment of the present application.

[0052] Figure 16 is a distribution diagram of the adhesive in another embodiment of the present application.

[0053] Figure 17 is a structural diagram of the solar cell string in one embodiment of the present application.

[0054] Figure 18 is a one-end side view of the solar cell string in one embodiment of the present application.

[0055] Figure 19 is a one-end side view of the solar cell string in another embodiment of the present application.

[0056] Figure 20 is a one-end side view of the solar cell string in another embodiment of the present application.

[0057] Figure 21 is a structural diagram of the solar cell module in one embodiment of the present application.

[0058] Reference Signs:

[0059] 1, first cell string group; 2, second cell string group.

[0060] ​​10, solar cell; 10a, first cell piece; 10b, second cell piece; 10c, third cell piece; 11, first electrode; 12, second 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 interconnection 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, busbar conductive structure; 225, conductive contact; 226, wiring conductive structure; 30, adhesive body; 40, shielding member.

[0061] 100, solar cell string; 200, first cover plate; 300, second cover plate; 400, first encapsulation layer; 500, second encapsulation layer; 600, busbar. DETAILED DESCRIPTION

[0062] The present application will be further illustrated below in conjunction with specific embodiments. It should be understood that these specific embodiments are only for illustrating the present application and are not intended to limit the scope of the present application.

[0063] Hereinafter, specific embodiments of the solar cell without bus electrode, the solar cell string without bus electrode, the solar cell module, the power generation device, and the power consuming device of the present application are specifically disclosed with appropriate reference to the accompanying drawings. However, there will be cases where unnecessary detailed description is omitted. For example, there will be cases where detailed description of matters that are already well known, repeated description of actually identical structures are omitted. This is to avoid the following description from becoming unnecessarily lengthy and to facilitate understanding by those skilled in the art. Furthermore, the accompanying drawings and the following description are provided so that those skilled in the art can fully understand the present application, and are not intended to limit the subject matter recited in the claims.

[0064] 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. Similarly, 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 or upper limit and be combined with any other point or single value, or with other lower 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 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.

[0065] 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.

[0066] 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.

[0067] 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.

[0068] If not specifically stated, the term "or" in the present application is inclusive. For example, the phrase "A or B" means "A, B, or both A and B." More specifically, any of the following satisfy the condition "A or B": 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).

[0069] If not specifically stated, the term "and / or" in the present application is merely a description of the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B, which can represent the three cases of A existing alone, A and B existing together, and B existing alone. In addition, the character " / " in the present application generally represents an "or" relationship between the associated objects.

[0070] In the present application, the terms "a plurality of" and "a plurality of" refer to two or more.

[0071] Unless otherwise defined, all technical and scientific terms used in the present application have the same meaning as understood by those skilled in the art to which the present application belongs; the terms used in the present application are only for the purpose of describing specific embodiments and are not intended to limit the present application; the terms "include" and "have" in the specification and claims of the present application and their any variations are intended to cover non-exclusive inclusion. Unless otherwise stated, the terms used in the present application have the same meaning as generally understood by those skilled in the art. Unless otherwise stated, the values of the parameters mentioned in the present application can be measured by various measuring methods commonly used in the art (for example, tests can be performed according to the methods given in the examples of the present application).

[0072] In the electrical interconnection technology of solar cell 10, a common method is to use a conductive wire with a conductive alloy coating on the surface to electrically connect the positive and negative electrodes of a plurality of solar cells 10 in series, so that the plurality of solar cells 10 cooperate to generate electricity. The conductive wire can be fused with the positive and negative electrodes of the solar cell 10 by high-temperature welding. Specifically, a high-temperature means such as a heat infrared lamp can be used to irradiate, so that the conductive wire and the electrode are melted and tightly combined at high temperature, so as to form a firm mechanical connection and good electrical contact between the conductive wire and the electrode. However, in actual application, the conductive wire will deform due to the temperature change of the solar cell 10, and the deformation of the conductive wire will cause the displacement of the solar cell 10 at the welding point, thereby adversely affecting the structural stability and electrical performance of the cell.

[0073] Based on this, a first aspect of this application provides a solar cell string 100 without bus electrodes. The solar cell string 100 includes a conductive interconnect film 20, a plurality of solar cells 10 located on one side of the conductive interconnect film 20 and electrically connected to the conductive interconnect film 20, and an insulating adhesive 30 connecting the conductive interconnect film 20 and the solar cells 10. The 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, with the first electrode 11 and the second electrode 12 having opposite polarities. 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 alternately arranged along a second direction, with the first direction intersecting the second direction. The conductive interconnect 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. 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. An 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.

[0074] The structure and connection relationship of the solar cell 10, the conductive interconnect film 20, and the adhesive 30 are further explained below.

[0075] 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.

[0076] It is understood that the battery body in this application 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.

[0077] 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.

[0078] 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.

[0079] 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.

[0080] 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.

[0081] 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.

[0082] In some embodiments, the first semiconductor region 13 and the second semiconductor region 14 are electrically coupled in a local region, where the local region refers to a certain portion or location inside the cell, which can be a small portion of the cell or a certain functional region inside the cell. In the local region, the first semiconductor region 13 and the second semiconductor region 14 can be in direct contact to form an electrical path, or can be in contact through a tunneling dielectric layer to form an electrical path, which causes partial carrier recombination at the contact points, resulting in current leakage, i.e., forming a leakage current, and reducing the power generation efficiency of the cell. However, the leakage current in the local region can be used to improve the hot spot resistance of the solar cell string 100.

[0083] In some embodiments, the first semiconductor region 13 can be polysilicon doped with N-type doping elements such as phosphorus, arsenic, or antimony, and the second semiconductor region 14 can be polysilicon doped with P-type doping elements such as boron, aluminum, or gallium. As shown in FIG. 1, the cell body can further include a first interface passivation layer 16 and a second interface passivation layer 17, where 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 can be the same type of material or different types of material. As an example, the first interface passivation layer 16 and the second interface passivation layer 17 can each independently be at least one of silicon oxide, aluminum oxide, titanium oxide, silicon carbide, and amorphous silicon. Figure 2

[0084] In some embodiments, the first interface passivation layer 16 and / or the second interface passivation layer 17 can be a dielectric layer with a tunneling effect. As an example, the first interface passivation layer 16 and the second interface passivation layer 17 can each independently be an ultra-thin dielectric film with a thickness of 0.5-2 nm, where the thickness of the ultra-thin dielectric film can 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 between any two of the above values. As an example, the first interface passivation layer 16 and the second interface passivation layer 17 can each independently be a dielectric layer with a thickness of 2-10 nm, where the thickness of the dielectric layer can be 2 nm, 3 nm, 4 nm, 5 nm, 6 nm, 7 nm, 8 nm, 9 nm, 10 nm, etc., or a range between any two of the above values. The first interface passivation layer 16 and / or the second interface passivation layer 17 has a pinhole, which can provide a migration channel for carriers.

[0085] ​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.

[0086] 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.

[0087] 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.

[0088] 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.

[0089] 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.

[0090] 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.

[0091] 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.

[0092] 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.

[0093] In this application, the solar cell 10 does not contain a busbar (or main grid), and the first electrode 11 and the second electrode 12 are both finger electrodes (or fine grids). As a result, the amount of electrode material used can be reduced, thereby reducing production costs.

[0094] In some implementations, such as Figure 6 As shown, the solar cell string 100 includes a conductive interconnect film 20 and a plurality of solar cells 10 located on one side of the conductive interconnect film 20 and electrically connected to the conductive interconnect film 20, wherein the plurality of solar cells 10 are 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 interconnect 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.

[0095] In some embodiments, the conductive interconnect 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 interconnect film 20 and are electrically connected by the conductive interconnect film 20 to form a solar cell string 100.

[0096] In some implementations, the spacing between adjacent solar cells 10 is equal.

[0097] 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 7-8As shown, along the first direction, the solar cell string 100 includes three first, second and third solar cell pieces 10a, 10b and 10c in sequence. The first electrode 11 of the first solar cell piece 10a, the second electrode 12 of the second solar cell piece 10b and the first electrode 11 of the third solar cell piece 10c are on the same straight line; the second electrode 12 of the first solar cell piece 10a, the first electrode 11 of the second solar cell piece 10b and the second electrode 12 of the third solar cell piece 10c are on the same straight line.

[0098] In some embodiments, along the first direction, the first electrode 11 of the solar cell 10 is on the same straight line with the first electrode 11 of the adjacent solar cell 10. As an example, as shown in FIG. 1, the first electrode 11 of the first solar cell piece 10a, the first electrode 11 of the second solar cell piece 10b and the first electrode 11 of the third solar cell piece 10c are on the same straight line; the second electrode 12 of the first solar cell piece 10a, the second electrode 12 of the second solar cell piece 10b and the second electrode 12 of the third solar cell piece 10c are on the same straight line. Figure 8 As shown, the first electrode 11 of the first solar cell piece 10a, the first electrode 11 of the second solar cell piece 10b and the first electrode 11 of the third solar cell piece 10c are on the same straight line; the second electrode 12 of the first solar cell piece 10a, the second electrode 12 of the second solar cell piece 10b and the second electrode 12 of the third solar cell piece 10c are on the same straight line.

[0099] In some embodiments, the conductive interconnection film 20 includes a base film 21 and a conductive layer 22 on the side of the base film 21 facing the solar cell 10.

[0100] In some embodiments, the base film 21 is flexible. During the lamination operation of the solar cell module, the encapsulant is heated and pressure is applied, which causes the encapsulant to melt and the base film 21 to be pressed towards the solar cell 10, so that the conductive layer 22 is pressed against the electrode layer, thereby improving the reliability of the contact between the conductive layer 22 and the electrode layer.

[0101] In some embodiments, the base film 21 can be a thin film with uniform thickness or substantially uniform thickness.

[0102] In some embodiments, the thickness of the base film 21 is 10 μm-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 between any two of the above values. In some other embodiments of the present application, the thickness of the base film 21 can be 10 μm-100 μm.

[0103] In some embodiments, the base film 21 can 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).

[0104] In some embodiments, the conductive layer 22 includes a metal foil, which includes, but is not limited to, one or more of copper, copper alloy, aluminum, aluminum alloy, nickel, nickel alloy, gold, gold alloy, silver, and silver alloy. As an example, the conductive layer 22 can be a single-layer conductive layer 22, or can be a double-layer or multi-layer formed by stacking different conductive materials.

[0105] In some embodiments, the conductive layer 22 can be a metal foil adhered to the surface of the base film 21 by an adhesive, or can be adhered by heat pressing using the adhesion of the base film 21 at high temperature. The conductive layer 22 can be, for example, a flexible copper-clad plate (FPC plate). The conductive layer 22 can also be deposited on the surface of the base film 21 by chemical deposition, physical deposition, electroplating, etc.

[0106] In some embodiments, the conductive layer 22 is patterned, for example, the conductive layer 22 can be patterned by wet etching, laser melting, plasma etching, etc.

[0107] In some embodiments, the thickness of the conductive layer 22 is 10 μm-100 μm. As an example, the thickness of the conductive layer 22 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 formed by any two of the above values.

[0108] In some embodiments, along the first direction, the base film 21 is divided into first regions 211 and second regions 212 arranged alternately, wherein the solar cells 10 are electrically connected to the first regions 211, and the second regions 212 are spacing regions of adjacent solar cells 10. As an example, taking three adjacent solar cells 10 corresponding to the conductive interconnection film 20 as an example, as shown in FIG. 2A, 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 the first regions 211 is the same as the number of the solar cells 10. Figures 9-12

[0109] ​In some embodiments, 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. 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, and 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.

[0110] As an example, such as Figures 9-12 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 9-12 In the diagram, the first conductive structure 221 is shown in a black rectangular bar, and the second conductive structure 222 is shown in a gray rectangular bar.

[0111] As an example, such as Figure 7 and Figure 9 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.

[0112] As an example, such as Figure 8 and Figure 10 As shown, along the first direction, when the first electrode 11 of the solar cell 10 is on the same straight line as the first electrode 11 of the adjacent solar cell 10, 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.

[0113] In some embodiments, the conductive layer 22 further comprises a third conductive structure 223; one end of the third conductive structure 223 is electrically connected to the first conductive structure 221 of the first region 211 adjacent to one side of the third conductive structure 223, and the other end of the third conductive structure 223 is electrically connected to the second conductive structure 222 of the first region 211 adjacent to the other side of the third conductive structure 223. Specifically, one end of the third conductive structure 223 is electrically connected to the first electrode 11 of the solar cell 10 adjacent to one side of the third conductive structure 223 through the first conductive structure 221, and the other end of the third conductive structure 223 is electrically connected to the second electrode 12 of the solar cell 10 adjacent to the other side of the third conductive structure 223 through the second conductive structure 222. Thus, the third conductive structure 223 connects the adjacent solar cells 10 in series.

[0114] As an example, as shown in FIG. 2, 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 of the first region 211a, the third conductive structure 223, and the second conductive structure 222 of the first region 211b are on the same straight line, and can be integrally provided. It can be understood that the third conductive structure 223 is located in the second region 212 of the base film 21. Figure 9

[0115] As an example, as shown in FIG. 2, 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 of the first region 211a, the third conductive structure 223, and the second conductive structure 222 of the first region 211b can be integrally provided. Figure 10 In other embodiments, the conductive layer 22 further comprises a busbar conductive structure 224. As shown in FIG. 2 and FIG. 3, the busbar conductive structure 224 can be located in the second region 212a and the second region 212b, and the busbar conductive structure 224 extends along the second direction. Wherein, the first conductive structure 221 of the first region 211a extends to the busbar conductive structure 224 and has an intersection with the busbar conductive structure 224; the second conductive structure 222 of the first region 211b extends to the busbar conductive structure 224 and has an intersection with the busbar conductive structure 224. At this time, the first conductive structure 221 and the second conductive structure 222 in the first region 211a and the second region 212b that are conductive to each other are both connected to the busbar conductive structure 224. Thus, the busbar conductive structure 224 connects the adjacent solar cells 10 in series.

[0116] Figure 11 Figure 12 As an example, as shown in FIG. 2, 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 of the first region 211a, the third conductive structure 223, and the second conductive structure 222 of the first region 211b can be integrally provided.

[0116] In other embodiments, the conductive layer 22 further comprises a busbar conductive structure 224. As shown in FIG. 2 and FIG. 3, the busbar conductive structure 224 can be located in the second region 212a and the second region 212b, and the busbar conductive structure 224 extends along the second direction. Wherein, the first conductive structure 221 of the first region 211a extends to the busbar conductive structure 224 and has an intersection with the busbar conductive structure 224; the second conductive structure 222 of the first region 211b extends to the busbar conductive structure 224 and has an intersection with the busbar conductive structure 224. At this time, the first conductive structure 221 and the second conductive structure 222 in the first region 211a and the second region 212b that are conductive to each other are both connected to the busbar conductive structure 224. Thus, the busbar conductive structure 224 connects the adjacent solar cells 10 in series.

[0117] In some embodiments, the conductive layer 22 further comprises a wiring conductive structure 226. In the first direction, two ends of the base film 21 are divided into a third region 213 and a fourth region, 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 with the second conductive structure 222 of the adjacent first region 211, the wiring conductive structure 226 of the third region 213 is electrically connected with 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 with the first conductive structure 221 of the first region 211 adjacent to the fourth region. The wiring conductive structure 226 is used to externally connect the circuit to lead out the current generated by the single solar cell string 100.

[0118] As an example, as shown in Figures 10-12 In the first direction, one end of the base film 21 comprises the third region 213, and the third region 213 is adjacent to the first region 211a. When the first conductive structure 221 of the first region 211a is electrically connected with the second conductive structure 222 of the first region 211b, the wiring conductive structure 226 of the third region 213 is electrically connected with the second conductive structure 222 of the first region 211a. Optionally, the wiring conductive structure 226 of the third region 213 is integrally arranged with the second conductive structure 222 of the first region 211a.

[0119] In some embodiments, the solar cell string 100 comprises an adhesive body 30, the adhesive body 30 has insulation, and the adhesive body 30 is arranged in the region of the base film 21 where the conductive layer 22 is not arranged, and the adhesive body 30 is in contact with the base film 21 and the cell body. Thus, the conductive interconnection film 20 and the plurality of solar cells 10 are bonded into one whole by the adhesive body 30.

[0120] In some embodiments, the conductive layer 22 and the electrode layer are electrically connected by contact connection. As shown in Figure 13 Under the action of the adhesive body 30, the first conductive structure 221 and the first electrode 11 can be electrically connected only by contact connection; and / or, the second conductive structure 222 and the second electrode 12 can be electrically connected only by contact connection. It can be understood that the contact connection to form the electrical connection can be that the first conductive structure 221 and the second conductive structure 222 are in direct physical contact with the first electrode 11 and the second electrode 12, respectively, so that the solar cell string 100 of the present application has no welding point, bonding or intermediate conductive connecting member, etc.

[0121] In other embodiments, the conductive layer 22 and the electrode layer can also be electrically connected by the conductive contact 225. As shown in Figure 14As shown, the first conductive structure 221 forms an electrical connection with the first electrode 11 through the conductive contact 225; and / or, the second conductive structure 222 forms an electrical connection with the second electrode 12 through the conductive contact 225. The conductive contact 225 between the conductive layer 22 and the electrode layer can be formed by laser welding, ultrasonic welding, thermal infrared welding, resistance heating welding, etc., or a conductive adhesive can be applied between the conductive layer 22 and the electrode layer to form the conductive contact 225, which can be ECA, solder paste, etc. For laser welding, ultrasonic welding, conductive adhesive, etc., the solar cell 10 can be connected in series at a lower temperature to reduce the degree of warping of the solar cell 10.

[0122] 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.

[0123] In some embodiments, the width of the first conductive structure 221 and the width of the second conductive structure 222 are independently 30 μm-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 formed by any two of the above values. As an example, the width of 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 formed by any two of the above values.

[0124] In some embodiments, the width of the first electrode 11 and the width of the second electrode 12 are independently 5 μm-50 μm. As an example, the width of the first electrode 11 can be 5 μm, 10 μm, 15 μm, 20 μm, 25 μm, 30 μm, 35 μm, 40 μm, 45 μm, 50 μm, etc., or a range formed by any two of the above values. As an example, the width of the second electrode 121 can be 5 μm, 10 μm, 15 μm, 20 μm, 25 μm, 30 μm, 35 μm, 40 μm, 45 μm, 50 μm, etc., or a range formed by any two of the above values.

[0125] In some embodiments, the pitch of the first conductive structure 221 and the second conductive structure 222 is 30 μm to 600 μm. As an example, the pitch of 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, or a range defined by any two of the above values.

[0126] In some embodiments, as shown in FIG. 1, 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 containing space, and the adhesive body 30 is located in the containing space. Figures 13-14

[0127] In some embodiments, the adhesive bodies 30 in a single containing space are arranged continuously or at intervals. As an example, as shown in FIG. 1, the adhesive bodies 30 can be arranged in the entire area of the same containing space (only the area of the containing space toward the side of the battery body is shown in FIG. 1). Figure 15 Figure 15 As an example, as shown in FIG. 2, the adhesive bodies 30 can also be arranged in a partial area of the same containing space (only the area of the containing space toward the side of the battery body is shown in FIG. 2). Figure 16 Figure 16

[0128] In some embodiments, the adhesive body 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, and 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. In this way, the conductive layer 22 and the electrode layer can form good physical contact. It can be understood that, for the distance between the first contact surface and the battery body, and the distance between the second contact surface and the battery body, the reference surface on which the battery body is measured is the same and consistent.

[0129] 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.

[0130] ​​​​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 process 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.

[0131] 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.

[0132] In some implementations, such as Figure 13 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.

[0133] 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.

[0134] 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 causing the base film 21 to move towards the solar cell 10, pressing the conductive layer 22 against the electrode layer, thus forming good physical contact between the conductive layer 22 and the electrode layer.

[0135] 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 casting. For example, the raw material of the adhesive 30 may be epoxy resin, silicone resin, acrylic resin, or polyurethane resin.

[0136] In some embodiments, the material of the adhesive 30 can be solid before curing, and the material of the adhesive 30 needs to be heated in real time by a device when the material of the adhesive 30 is applied, so that the material of the adhesive 30 becomes a flowable state. For example, the material of the adhesive 30 can be a hot melt adhesive.

[0137] In some embodiments, the adhesive 30 has a positive curing volume shrinkage. Specifically, the material of the adhesive 30 (such as epoxy glue, silicone glue, acrylate glue, and polyurethane glue) gradually shrinks in volume during the curing process, showing a positive curing volume shrinkage, and thus the adhesive 30 has a positive curing volume shrinkage.

[0138] In some embodiments, the adhesive 30 has elasticity. Thus, during the lamination operation of the solar cell module, the encapsulant is melted and pressure is applied to the flexible base film 21 towards the solar cell 10 by heating, and at this time the adhesive 30 can be compressed, so that the distance of the region of the base film 21 without the conductive layer 22 moving towards the solar cell 10 is greater than the distance of the region of the base film 21 with the conductive layer 22 moving towards the solar cell 10. This difference in displacement is conducive to maintaining good conductive contact between the conductive layer 22 and the electrode layer. When the encapsulant is cured, the pressure of the part of the base film 21 without the conductive layer 22 will remain, so that the conductive layer 22 and the electrode layer always maintain good conductive contact.

[0139] During the formation of the adhesive 30, the material of the adhesive 30 can be pre-positioned on the surface of the base film 21, specifically, all or part of the spacing region between the first conductive structure 221 and the second conductive structure 222. The material of the adhesive 30 can also be pre-positioned on the surface of the cell body, specifically, all or part of the spacing region between the first electrode 11 and the second electrode 12. The material of the adhesive 30 can also be positioned on the surface of the base film 21 and the surface of the cell body at the same time. However, the amount of the material of the adhesive 30 applied should be appropriate, and the material of the adhesive 30 has flowability in the early stage of curing. Excessive material of the adhesive 30 is prone to flow between the electrode layer and the conductive layer 22, which affects the conductive effect of the electrode layer and the conductive layer 22.

[0140] In some embodiments, the adhesive 30 can serve as an electrically 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, so as to reduce the risk of electrical leakage of the solar cell string 100.

[0141] In the present application, the process of forming the solar cell string 100 can be: first, applying a raw material of the adhesive 30 to the region between the first electrode 11 and the second electrode 12 of the solar cell 10, then aligning the first electrode 11 of the plurality of solar cells 10 and the first conductive structure 221 of the corresponding region in turn, aligning the second electrode 12 and the second conductive structure 222 of the corresponding region, and after the raw material of the adhesive 30 is cured, the conductive interconnection film 20 and the plurality of solar cells 10 form an integral whole, which is the solar cell string 100.

[0142] In the second aspect of the present application, the present application provides a solar cell module, which comprises a plurality of solar cell strings 100 without bus electrodes according to the first aspect of the present application arranged at intervals.

[0143] In some embodiments, as shown in FIG. 1, the plurality of solar cell strings are arranged at intervals along the first direction and / or the second direction. Figure 1

[0144] In some embodiments, the conductive interconnection film 20 can have a strip shape with a certain width and length; wherein the length is in the first direction and the width is in the second direction. The plurality of solar cells 10 are arranged along the length direction of the conductive interconnection film 20 and are electrically connected by the conductive interconnection film 20 to form the solar cell string 100. The width of the conductive interconnection film 20 can be less than or equal to the length of the solar cell 10 along the second direction. In this way, the long side of the conductive interconnection film 20 can be hidden behind the back 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 part of the conductive interconnection film 20 between the solar cell strings 100 and reducing the adverse effect on the appearance of the solar cell module.

[0145] In some embodiments, the width of the conductive interconnection film 20 is 150-1400 mm. As an example, the width of the conductive interconnection film 20 can be 150 mm, 240 mm, 340 mm, 440 mm, 540 mm, 640 mm, 740 mm, 840 mm, 940 mm, 1040 mm, 1140 mm, 1240 mm, 1340 mm, 1400 mm, etc., or a range composed of any two of the above values.

[0146] In other embodiments, the solar cells 10 are arranged in a rectangular array on the conductive interconnection film 20, and the solar cells 10 are all electrically connected to the conductive interconnection film 20. At this time, the conductive interconnection film 20 can be module-level, and the length and width of the conductive interconnection film 20 can substantially cover the solar cell 10 array, and all the solar cells 10 in the solar cell module are attached to the conductive interconnection film 20. The conductive layer 22 of the conductive interconnection film 20 can connect these solar cells 10 in series to form several solar cell strings 100.

[0147] ​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 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 solar cell strings 100 in parallel.

[0148] 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.

[0149] like Figure 21 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.

[0150] 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.

[0151] As an example, such as Figure 21As shown, the solar cell module includes a first cell string group 1, which includes a plurality of solar cell strings 100 arranged along a second direction. The positive pole of each solar cell string 100 is electrically connected to the negative pole of an adjacent solar cell string 100 through a busbar 600. In this way, the first cell string group 1 forms a complete current loop to connect the plurality of solar cell strings 100 in series. Specifically, the first cell string group 1 includes solar cell strings 100a, 100b, 100c, 100d, 100e, 100f arranged along the second direction in sequence. The busbar 600a electrically connects the positive pole of the solar cell string 100a and the negative pole of the solar cell string 100b, the busbar 600b electrically connects the positive pole of the solar cell string 100b and the negative pole of the solar cell string 100c, the busbar 600c electrically connects the positive pole of the solar cell string 100c and the negative pole of the solar cell string 100d, and so on. The other connection relationships are not described herein. In this way, the plurality of solar cell strings 100 in the first cell string group 1 are connected in series.

[0152] As an example, the solar cell module can further include a second cell string group 2, and the solar cell strings 100 of the second cell string group 2 are connected in series. For details, please refer to the first cell string group 1.

[0153] In some embodiments, as shown in Figure 18 and Figure 19 As shown, the busbar 600 is located on the side of the conductive interconnection 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, as shown in Figure 19 The base film 21 at the corresponding position of the wiring conductive structure 226 of the conductive interconnection film 20 can be omitted.

[0154] In some embodiments, as shown in Figure 20 The busbar 600 is located on the side of the conductive interconnection film 20 away from the solar cell 10, that is, the busbar 600 can also be on the side different from the solar cell 10. At this time, the busbar 600 is hidden on the back 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 generation area of the solar cell module, so as to improve the energy conversion efficiency of the solar cell module.

[0155] As an example, along the first direction, the orthogonal projection of the base film 21 on the solar cell string 100 is located in the end solar cell 10 of the solar cell string 100. As shown in Figure 20As shown, taking one end of the solar cell string 100 as an example, the conductive wiring structure 226 has a bent portion, 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 bent portion 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.

[0156] In some embodiments, the solar cell module further includes a solar cell string 100 with a shading member 40. The shading member 40 is located at least in the area of ​​the base film 21 facing the solar cell 10 and where no solar cell 10 is disposed. Because there are gaps between the solar cells 10, the conductive interconnect film 20 can be seen through the gaps on the front side of the solar cell module. The shading 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.

[0157] As an example, such as Figure 9 , Figure 17 As shown, the shielding member 40 can be disposed in the second region 212 of the conductive interconnect film 20, and the third conductive structure 223 is located between the base film 21 and the shielding member 40.

[0158] As an example, the shielding member 40 may be a film attached to the conductive interconnect film 20 or a coating applied to the conductive interconnect film 20. The film or coating is insulating.

[0159] As an example, the color of the masking member 40 includes black.

[0160] In some implementations, for the module-level conductive interconnect film 20, the gap between adjacent solar cell strings 100 may also expose the conductive interconnect film 20, so a shielding member 40 can also be provided between adjacent solar cell strings 100.

[0161] 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 designated as the first encapsulation layer 400; the encapsulation layer located on the other side of the multiple solar cell strings 100 is designated as the second encapsulation layer 500. The solar cell strings 100 can be encapsulated within the encapsulation layers, which can block moisture, oxygen, and other substances harmful to the solar cells 10 and the connecting circuits.

[0162] As an example, the first encapsulation layer 400 and the second encapsulation layer 500 can each independently be at least one of an ethylene vinyl acetate copolymer (EVA), a polyvinyl butyral, a silicone resin, an ester resin, and an olefin resin. Embodiments of the present disclosure are not limited to these materials.

[0163] In some embodiments, if light enters the solar cell 10 from the direction of the first encapsulation layer 400, the conductive interconnection film 20 is located between the plurality of solar cell strings 100 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.

[0164] In some embodiments, the solar cell module further includes a cover plate located on the side of the encapsulation layer away from the plurality of solar cell strings 100. The cover plate can protect the solar cell 10. As shown in FIG. 1, the cover plate located on the side of the first encapsulation layer 400 away from the plurality of solar cell strings 100 is denoted as the first cover plate 200, and the cover plate located on the side of the second encapsulation layer 500 away from the plurality of solar cell strings 100 is denoted as the second cover plate 300. Figure 1

[0165] 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 a light-transmitting resin, a flexible layer woven from light-transmitting fibers, or the like. The non-light-transmitting material can have a Tedlar / PET / Tedlar (TPT) type or can have a structure in which a polyvinylidene fluoride (PVDF) resin is formed on at least one surface of a polyethylene terephthalate (PET).

[0166] In some embodiments, the solar cell module includes, in order, the first cover plate 200, the first encapsulation layer 400, the plurality of solar cell strings 100, the second encapsulation layer 500, and the second cover plate 300. These layers can be encapsulated together by a lamination process. A frame (not shown in FIG. 1) is configured to surround the shape of the solar cell module to provide structural protection to the laminate. Figure 1

[0167] In a third aspect of the present application, a power generation device is provided, which includes the solar cell module of the second aspect of the present application. With the above-described solar cell module, the power generation device has a high energy conversion efficiency and can be used in application scenarios requiring electrical conductivity.

[0168] ​​In a fourth aspect of the present application, the present application provides a power consuming device comprising the solar cell module of the second aspect of the present application. The solar cell module can be used as a power source of the power consuming device, or can be used as an energy storage unit. The power consuming device can be, but is not limited to, a mobile device (e.g. a mobile phone, a laptop, etc.), an electric vehicle (e.g. a pure electric vehicle, a hybrid electric vehicle, a plug-in hybrid electric vehicle, an electric bicycle, an electric scooter, an electric golf cart, an electric truck, etc.), an electric train, a ship and a satellite, an energy storage system, etc. As an example, the power consuming device can be a pure electric vehicle, a hybrid electric vehicle, or a plug-in hybrid electric vehicle, etc. The power consuming device comprises the solar cell module. As an example, the power consuming device can be a mobile phone, a tablet, a laptop, etc.

[0169] In a fifth aspect of the present application, the present application provides a solar cell 10 without a busbar electrode, comprising a cell body, and an electrode layer located at one side of the cell body, the electrode layer comprising a first electrode 11 and a second electrode 12, the first electrode 11 and the second electrode 12 having opposite polarities; the first electrode 11 and / or the second electrode 12 continuously or discontinuously extend along a first direction, and the first electrode 11 and the second electrode 12 are alternately and spacedly arranged along a second direction, the first direction intersecting the second direction.

[0170] In some embodiments, the width of the first electrode 11 and the width of the second electrode 12 are independently 5 μm-50 μm. As an example, the width of the first electrode 11 can be 5 μm, 10 μm, 15 μm, 20 μm, 25 μm, 30 μm, 35 μm, 40 μm, 45 μm, 50 μm, etc., or a range between any two of the above values. As an example, the width of the second electrode 121 can be 5 μm, 10 μm, 15 μm, 20 μm, 25 μm, 30 μm, 35 μm, 40 μm, 45 μm, 50 μm, etc., or a range between any two of the above values.

[0171] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or equivalently replace some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should be covered in the scope of the claims and the specification of the present application. In particular, as long as there is no structural conflict, each technical feature mentioned in each embodiment can be combined in any manner. The present 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 solar cell string without busbar electrodes, characterized in that, include: A plurality of solar cells are arranged along a first direction. Each solar cell includes a cell body and an electrode layer located on one side of the cell body. The electrode layer includes a first electrode and a second electrode, the first electrode and the second electrode having opposite polarities. The first electrode and / or the second electrode extend continuously or intermittently along the first direction, and the first electrode and the second electrode are arranged alternately along a second direction, the first direction intersecting the second direction. A conductive interconnect film, wherein a plurality of solar cells are located on one side of the conductive interconnect film, and the conductive interconnect film is electrically connected to the plurality of solar cells; the conductive interconnect film includes: a base film, and a conductive layer located on the side of the base film facing the solar cells; the conductive layer includes: a first conductive structure disposed and electrically connected to the first electrode, and a second conductive structure disposed and electrically connected to the second electrode; An adhesive having insulating properties is disposed in a region of the base film where the conductive layer is not disposed, and the adhesive is in contact with the base film and the battery body.

2. The solar cell string without busbar electrodes according to claim 1, characterized in that, The adhesive has a first contact surface with the base film, and the conductive layer 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.

3. The solar cell string without busbar electrodes according to claim 1, characterized in that, The adhesive has a positive curing volume shrinkage rate.

4. The solar cell string without busbar electrodes according to claim 1, characterized in that, The adhesive is an epoxy resin cured product, an organosilicon cured product, an acrylic resin cured product, a polyurethane cured product, or a hot melt adhesive cured product.

5. The solar cell string without busbar electrodes according to claim 1, characterized in that, The adhesive is elastic.

6. The solar cell string without busbar electrodes according to claim 1, characterized in that, The base film extends across the boundary of the first electrode and / or the second electrode of the solar cell and contacts the adhesive at an angle toward the solar cell.

7. The solar cell string without busbar electrodes according to claim 1, characterized in that, The base film on which the adhesive is disposed has a protruding structure facing the battery body.

8. The solar cell string without busbar electrodes according to claim 1, characterized in that, The base film is flexible; and / or, The thickness of the base film is 10μm-5000μm.

9. The solar cell string without busbar electrodes according to claim 8, characterized in that, The base film is at least one of polyimide, polyethylene terephthalate, polyethylene naphthalate, liquid crystal display polymer, polyolefin, or ethylene-vinyl acetate copolymer.

10. The solar cell string without busbar electrodes according to claim 1, characterized in that, The first electrode, the second electrode adjacent to the first electrode, the battery body, the first conductive structure, the second conductive structure adjacent to the first conductive structure, and the base film form a receiving space, and the adhesive is located within the receiving space.

11. The solar cell string without busbar electrodes according to claim 10, characterized in that, The adhesives within a single accommodating space are arranged continuously or at intervals.

12. The solar cell string without busbar electrodes according to claim 1, characterized in that, The width of the first conductive structure is greater than or equal to the width of the first electrode; and / or, The width of the second conductive structure is greater than or equal to the width of the second electrode.

13. The solar cell string without busbar electrodes according to claim 12, characterized in that, The widths of the first conductive structure and the second conductive structure are independently 30 μm-600 μm; and / or, The width of the first electrode and the width of the second electrode are independently 5μm-50μm.

14. The solar cell string without busbar electrodes according to claim 1, characterized in that, The conductive layer and the electrode layer are connected by a contact to form the electrical connection; and / or The conductive layer and the electrode layer form an electrical connection through conductive contacts.

15. The solar cell string without busbar electrodes according to claim 14, characterized in that, The first conductive structure and the first electrode are connected by a contact to form the electrical connection; and / or, The first conductive structure and the first electrode form an electrical connection through conductive contacts.

16. The solar cell string without busbar electrodes according to claim 14, characterized in that, The second conductive structure and the second electrode are connected by a contact to form the electrical connection; and / or, The second conductive structure and the second electrode form an electrical connection through conductive contacts.

17. The solar cell string without busbar electrodes according to any one of claims 1-16, characterized in that, The conductive layer further includes a third conductive structure; One end of the third conductive structure is electrically connected to the first electrode of the solar cell adjacent to one side of the third conductive structure through the first conductive structure, and the other end of the third conductive structure is electrically connected to the second electrode of the solar cell adjacent to the other side of the third conductive structure through the second conductive structure.

18. A solar cell module, characterized in that, It includes multiple solar cell strings without busbars, arranged at intervals as described in any one of claims 1-17.

19. The solar cell module according to claim 18, characterized in that, Also includes: An encapsulation layer, the encapsulation layer being located on at least one side of the plurality of solar cell strings; A cover plate located on the side of the encapsulation layer away from the plurality of solar cell strings.

20. A power generation device, characterized in that, Includes the solar cell module as described in any one of claims 18-19.

21. An electrical appliance, characterized in that, Includes the solar cell module as described in any one of claims 18-19.

22. A solar cell without a current collector electrode, characterized in that, include: The battery body and an electrode layer located on one side of the battery body, the electrode layer including a first electrode and a second electrode, the first electrode and the second electrode having opposite polarities; the first electrode and / or the second electrode extending continuously or intermittently along a first direction, and the first electrode and the second electrode being arranged alternately along a second direction, the first direction intersecting the second direction.

23. The solar cell according to claim 22, characterized in that, The width of the first electrode and the width of the second electrode are independently 5μm-50μm.

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