Photovoltaic cell and photovoltaic module

Abstract

The invention relates to the technical field of photovoltaic, provides a photovoltaic cell and a photovoltaic module, and at least facilitates the improvement of the efficiency and yield of the photovoltaic cell. The photovoltaic cell comprises a cell body, the surface of the cell body is provided with an isolation layer, and the isolation layer is used for isolating adjacent cell bodies; the isolation layer comprises a first isolation layer which covers the surface of the battery body; the second isolation layer is positioned on one side, far away from the battery body, of the first isolation layer; the light trapping parts are located between the first isolation layer and the second isolation layer, each light trapping part is in a cone shape, the top of each cone faces the first isolation layer, and the bottom of each cone faces the second isolation layer.

Description

Technical Field

[0001] The present application relates to the field of photovoltaic technology, and in particular to a photovoltaic cell and a photovoltaic module. Background Art

[0002] Photovoltaic modules are components that use the photovoltaic effect to generate electricity. They are usually composed of photovoltaic cells, welding strips, adhesive films and cover plates. Photovoltaic cells are an important component of the main components. When storing and transporting photovoltaic cells, multiple photovoltaic cells are directly stacked. Since there are electrodes on the surface of photovoltaic cells, adjacent photovoltaic cells are in direct contact when stacked, which can easily scratch the surface of the photovoltaic cells due to friction, thereby reducing the photovoltaic cells' absorption of light, and further causing the photovoltaic cells' photoelectric conversion performance to decline.

[0003] At present, in order to reduce the possibility of scratches on the surface of photovoltaic cells caused by stacking and transportation of photovoltaic cells, operators place isolation paper between two adjacent photovoltaic cells. However, the isolation paper is difficult to remove and is easily brought into the production line and causes malfunctions. In addition, the utilization rate of the isolation paper is low and the consumption is high, resulting in increased costs. Summary of the invention

[0004] The embodiments of the present application provide a photovoltaic cell and a photovoltaic module, which are at least beneficial to improving the efficiency and yield of the photovoltaic cell.

[0005] According to some embodiments of the present application, on one hand, the embodiments of the present application provide a photovoltaic cell, comprising: a battery body, the surface of the battery body having an isolation layer, the isolation layer being used to isolate adjacent battery bodies; the isolation layer comprising: a first isolation layer, the first isolation layer covering the surface of the battery body; a second isolation layer, the second isolation layer being located on a side of the first isolation layer away from the battery body; a plurality of light trapping portions, the light trapping portions being located between the first isolation layer and the second isolation layer, the light trapping portions being in the shape of a cone, the top of the cone facing the first isolation layer, and the bottom of the cone facing the second isolation layer.

[0006] In some embodiments, the material of the first isolation layer includes at least one of polyethylene terephthalate, ethylene / vinyl acetate copolymer, or polyolefin elastomer; the material of the light trapping portion includes at least one of polymethyl methacrylate, polystyrene, polycarbonate, or silicone; the material of the second isolation layer includes at least one of polyethylene terephthalate, ethylene / vinyl acetate copolymer, or polyolefin elastomer.

[0007] In some embodiments, the first isolation layer includes a first sub-isolation layer and a second sub-isolation layer, the first sub-isolation layer is located on the surface of the battery body, the second sub-isolation layer is located on the side of the first sub-isolation layer away from the battery body, and the melting point of the material of the first sub-isolation layer is lower than the melting point of the material of the second sub-isolation layer.

[0008] In some embodiments, a grid line is provided on the surface of the battery body, and a thickness of the isolation layer is greater than a height of the grid line in a direction perpendicular to the surface of the battery body.

[0009] In some embodiments, the bottom width of the light trapping portion is 5 μm-50 μm; and the height of the light trapping portion relative to the surface of the second isolation layer is 20 μm-60 μm.

[0010] In some embodiments, the width of the gap between the bottoms of adjacent light trapping portions is 10 μm-50 μm.

[0011] In some embodiments, the first isolation layer and the second isolation layer are spaced apart from each other, and an isolation gas is filled between adjacent light trapping portions.

[0012] In some embodiments, the first isolation layer fills the gaps between the light trapping portions and contacts the second isolation layer.

[0013] According to some embodiments of the present application, on the other hand, the embodiments of the present application further provide a photovoltaic assembly, comprising: a plurality of battery bodies as described in the above embodiments; a welding strip, the welding strip being located between the battery body and the isolation layer, and being used to connect two adjacent battery bodies.

[0014] In some embodiments, the isolation layer is further located between adjacent battery bodies, and a first isolation layer of the isolation layer covers a plurality of welding strips located between two adjacent battery bodies.

[0015] The technical solution provided by the embodiments of the present application has at least the following advantages: In the photovoltaic cell provided in the embodiment of the present application, an isolation layer is provided on the surface of the battery body, and the isolation layer is used to isolate adjacent battery bodies to avoid the problem of scratches on the surface of the photovoltaic cell caused by direct contact between adjacent photovoltaic cells when stacked, thereby avoiding the photoelectric conversion performance of the photovoltaic cell from being affected and improving the yield of the photovoltaic cell. In addition, the isolation layer includes a first isolation layer, a light trapping portion, and a second isolation layer sequentially arranged on the surface of the battery body. The light trapping portion is in the shape of a cone, with the top of the cone facing the first isolation layer and the bottom of the cone facing the second isolation layer. In this way, when sunlight is irradiated on the surface of the battery body, the light trapping portion can play a light trapping role to improve the light absorption efficiency of the photovoltaic cell. The photovoltaic cell provided in the embodiment of the present application does not require additional isolation paper to isolate adjacent photovoltaic cells, which reduces the use cost of isolation paper and the risk of failure caused by isolation paper, improves the yield of the photovoltaic cell, and can also improve the light conversion performance of the photovoltaic cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] One or more embodiments are exemplarily illustrated by the pictures in the corresponding drawings. These exemplified descriptions do not constitute a limitation on the embodiments. Unless otherwise specified, the pictures in the drawings do not constitute a scale limitation. In order to more clearly illustrate the embodiments of the present application or the technical solutions in the traditional technology, the drawings required for use in the embodiments are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 A top view of a photovoltaic cell provided in an embodiment of the present application; Figure 2 for Figure 1 Schematic diagram of the first cross-sectional structure along the AA1 direction; Figure 3 for Figure 1 A schematic diagram of the second cross-sectional structure along the AA1 direction; Figure 4 for Figure 1 Schematic diagram of the third cross-sectional structure along the AA1 direction; Figure 5 for Figure 1 Schematic diagram of the fourth cross-sectional structure along the AA1 direction; Figure 6 A top view of a photovoltaic module provided in an embodiment of the present application. DETAILED DESCRIPTION

[0018] As can be seen from the background technology, when storing and transporting photovoltaic cells, operators place isolation paper between two adjacent photovoltaic cells. Since the isolation paper is difficult to remove, it is easy for the isolation paper to be brought into the production line and cause malfunctions; and the isolation paper has a low utilization rate and high consumption, resulting in increased costs.

[0019] The embodiments of the present application provide a photovoltaic cell and a photovoltaic module, wherein the photovoltaic cell itself has an isolation layer for isolating adjacent photovoltaic cells, thereby avoiding the problem of surface friction scratches caused by direct contact between adjacent photovoltaic cells during storage and transportation of the photovoltaic cells, and no additional isolation paper is required to isolate adjacent photovoltaic cells, thereby reducing the use cost of isolation paper and the risk of failure caused by isolation paper. At the same time, the isolation layer also has a light trapping effect, which can be used to improve the light absorption efficiency of the photovoltaic cell, thereby improving the light conversion performance of the photovoltaic cell.

[0020] In the description of the embodiments of the present application, technical terms such as "first" and "second" are only used to distinguish different objects and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features.

[0021] In the description of the embodiments of the present application, “plurality” means more than two, unless otherwise clearly and specifically defined.

[0022] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0023] In the description of the embodiments of the present application, technical terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0024] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0025] In the accompanying drawings corresponding to the embodiments of the present application, the thickness and area of ​​the layers are magnified for better understanding and ease of description. When describing a component on another component or on the surface of another component, the component may be "directly" located on the surface of the other component, or a third component may be present between the two components. On the contrary, when describing a component on the surface of another component or when another component is formed or provided on the surface of a component, it means that there is no third component between the two components. In addition, when describing a component as being "substantially" formed on another component, it means that the component is not formed on the entire surface (or front surface) of the other component, nor is it formed on a partial edge of the entire surface.

[0026] In the description of the embodiments of the present application, when a certain component “includes” another component, unless otherwise stated, other components are not excluded and other components may be further included.

[0027] The terms used in the description of the various described embodiments herein are used only to describe specific embodiments and are not intended to be limiting. As used in the description of the various described embodiments and the appended claims, "components" are also intended to include plural forms unless the context clearly indicates otherwise.

[0028] The following will describe the various embodiments of the present application in detail with reference to the accompanying drawings. However, it will be appreciated by those skilled in the art that in the various embodiments of the present application, many technical details are provided in order to enable the reader to better understand the present application. However, even without these technical details and various changes and modifications based on the following embodiments, the technical solution claimed in the present application can be implemented.

[0029] Figure 1 A top view of a photovoltaic cell provided in an embodiment of the present application; Figure 2 for Figure 1 Schematic diagram of the first cross-sectional structure along the AA1 direction; Figure 3 for Figure 1 A schematic diagram of the second cross-sectional structure along the AA1 direction; Figure 4 for Figure 1 Schematic diagram of the third cross-sectional structure along the AA1 direction; Figure 5 for Figure 1 Schematic diagram of the fourth cross-sectional structure along direction AA1.

[0030] refer to Figure 1 The photovoltaic cell provided in the embodiment of the present application includes: a cell body 100 and an isolation layer 110 located on the surface of the cell body 100, and the isolation layer 110 is used to isolate adjacent cell bodies 100. Figures 2 to 5 The isolation layer 110 includes: a first isolation layer 111, a second isolation layer 112 and a plurality of light trapping portions 113, wherein the first isolation layer 111 covers the surface of the battery body 100; the second isolation layer 112 is located on the side of the first isolation layer 111 away from the battery body 100; the light trapping portion 113 is located between the first isolation layer 111 and the second isolation layer 112, and the light trapping portion 113 is in the shape of a cone, with the top of the cone facing the first isolation layer 111 and the bottom of the cone facing the second isolation layer 112.

[0031] In the photovoltaic cell provided in the embodiment of the present application, an isolation layer 110 is provided on the surface of the battery body 100, and the isolation layer 110 is used to isolate adjacent battery bodies 100, so as to avoid the problem that the surface of the photovoltaic cell is scratched due to direct contact between adjacent photovoltaic cells when stacked, thereby avoiding the photoelectric conversion performance of the photovoltaic cell from being affected, and improving the yield of the photovoltaic cell. In addition, the isolation layer 110 includes a first isolation layer 111, a light trapping portion 113, and a second isolation layer 112 sequentially arranged on the surface of the battery body 100, and the shape of the light trapping portion 113 is a cone, the top of the cone faces the first isolation layer 111, and the bottom of the cone faces the second isolation layer 112, so that when sunlight is irradiated on the surface of the battery body 100, the light trapping portion 113 can play a light trapping role to improve the light absorption efficiency of the photovoltaic cell. The photovoltaic cell provided in the embodiment of the present application does not require additional isolation paper to isolate adjacent photovoltaic cells, reduces the use cost of isolation paper and the risk of failure caused by isolation paper, improves the yield of the photovoltaic cell, and can also improve the light conversion performance of the photovoltaic cell.

[0032] In some embodiments, the type of the battery body 100 is a monocrystalline silicon solar cell, a polycrystalline silicon solar cell, an amorphous silicon solar cell or a multi-compound solar cell, and the multi-compound solar cell specifically includes a cadmium sulfide solar cell, a gallium arsenide solar cell, a copper indium selenide solar cell or a perovskite solar cell.

[0033] In some embodiments, the battery body 100 is any one of a PERC battery (Passivated Emitter and Rear Cell), a PERT battery (Passivated Emitter and Rear Totally-diffused cell), a TOPCon battery (Tunnel Oxide Passivated Contact), a HIT / HJT battery (Heterojunction Technology), or a BC battery (Back Contact). Among them, the back contact battery includes an IBC battery (Interdigitated Back Contact), an HPBC battery (Hybrid Passivated Back Contact), a TBC battery with superimposed TOPCon technology and IBC technology, or an HBC battery with superimposed HIT / HJT technology and IBC technology.

[0034] refer to Figure 2 or Figure 4In some embodiments, the first isolation layer 111 and the second isolation layer 112 are spaced apart from each other, and there is an isolation gas between adjacent light-trapping portions 113. The isolation gas includes at least one of nitrogen, helium, neon or argon. Adjacent light-trapping portions 113 are filled with isolation gas, which, on the one hand, helps to keep the top of the light-trapping portion 113 always facing the battery body 100, so as to keep the light-trapping portions 113 neatly arranged, and further helps to refract sunlight, so as to improve the absorption efficiency of the photovoltaic cell for sunlight; on the other hand, the isolation gas also plays a buffering role, and when isolating adjacent photovoltaic cells, avoids the problem of excessive stress between adjacent photovoltaic cells causing the breakage of the photovoltaic cells.

[0035] It should be noted that in Figure 2 or Figure 4 In the figure, only a partial structural schematic diagram of the isolation layer 110 is shown, and the edge of the isolation layer 110 is not shown. When the light trapping portion 113 is filled with isolation gas, the edge of the first isolation layer 111 and the edge of the second isolation layer 112 are interconnected to improve the sealing effect of the isolation gas in the isolation layer 110.

[0036] In some embodiments, when the first isolation layer 111 and the second isolation layer 112 are spaced apart from each other and there is an isolation gas between adjacent light-trapping portions 113, the method for forming the isolation layer 110 includes: providing the second isolation layer 112; applying an adhesive on the surface of the second isolation layer 112; bonding the bottoms of the plurality of light-trapping portions 113 to the surface of the second isolation layer 112; providing the first isolation layer 111, covering the first isolation layer 111 to the side of the light-trapping portion 113 away from the second isolation layer 112, and bonding the first isolation layer 111 to the second isolation layer 112 around to achieve a sealing effect. In order to improve the stability of the relative position between the light-trapping portion 113 and the first isolation layer 111, the first isolation layer 111 is slightly melted by appropriately increasing the temperature, and then a portion of the top of the light-trapping portion 113 is embedded in the first isolation layer 111. In other embodiments, the light-trapping portion 113 is fixed on the surface of the second isolation layer 112 by heating the second isolation layer 112 and slightly melting it, and a portion of the bottom of the light-trapping portion 113 is embedded in the second isolation layer 112. The edge of the first isolation layer 111 and the edge of the second isolation layer 112 are connected by bonding or by cooling and solidifying after melting.

[0037] refer to Figure 3 or Figure 5 In other embodiments, the first isolation layer 111 fills the gap between the light trapping portions 113 and contacts the second isolation layer 112. In this way, the light trapping portions 113 are completely wrapped between the first isolation layer 111 and the second isolation layer 112 to keep the position of the light trapping portions 113 as unchanged as possible, thereby maintaining the isolation layer 110 with a good light trapping effect.

[0038] In some embodiments, when the first isolation layer 111 fills the gaps between the light trapping portions 113 and contacts the second isolation layer 112, the method for forming the isolation film 110 includes: providing the second isolation layer 112; fixing the light trapping portions 113 on the surface of the second isolation layer 112 with reference to the above-mentioned method for forming the isolation layer 110; providing the second isolation layer 111, heating and melting the first isolation layer 111 so that the first isolation layer 111 fills the gaps between the light trapping portions 113, and after cooling and solidification, the first isolation layer 111 fills the gaps between the light trapping portions 113 and contacts the second isolation layer 112.

[0039] The material of the first isolation layer 111 includes at least one of polyethylene terephthalate, ethylene / vinyl acetate copolymer, or polyolefin elastomer.

[0040] refer to Figure 2 and Figure 3 In some embodiments, the first isolation layer 111 is a single-layer structure.

[0041] refer to Figure 4 and Figure 5 In other embodiments, the first isolation layer 111 is a multi-layer structure. For example, the first isolation layer 111 includes a first sub-isolation layer 1111 and a second sub-isolation layer 1112, the first sub-isolation layer 1111 is located on the surface of the battery body 100, the second sub-isolation layer 1112 is located on the side of the first sub-isolation layer 1111 away from the battery body 100, and the melting point of the material of the first sub-isolation layer 1111 is lower than the melting point of the material of the second sub-isolation layer 1112. In this way, the isolation layer 110 can be covered on the surface of the battery body 100 by hot melting, and the melted first sub-isolation layer 1111 has a good bonding effect with the surface of the battery body 100. The higher melting point of the material of the second sub-isolation layer 1112 is conducive to maintaining the arrangement state of the light trapping portion 113, thereby maintaining the isolation layer 110 with a good light trapping effect.

[0042] In other embodiments, the number of layers of the first isolation layer is 3, 4 or 5, and the melting points of the materials of the multiple sub-isolation layers increase successively in the direction away from the battery body, so that the sub-isolation layer closest to the battery body has a better bonding effect with the battery body, avoiding the overall falling off or displacement of the isolation layer, and at the same time helping to maintain the arrangement of the light trapping portion.

[0043] refer to Figure 4 and Figure 5When the first isolation layer 111 includes a first sub-isolation layer 1111 and a second sub-isolation layer 1112, in some embodiments, the thickness of the first sub-isolation layer 1111 is less than the thickness of the second sub-isolation layer 1112. The first sub-isolation layer 1111 is used for bonding with the battery body 100. A thin thickness can prevent the first sub-isolation layer 1111 from being excessively deformed after melting, causing the arrangement deformation of the light trapping portion 113. A thicker second sub-isolation layer 1112 is conducive to maintaining the arrangement of the light trapping portion 113.

[0044] The material of the light trapping portion 113 includes at least one of polymethyl methacrylate, polystyrene, polycarbonate or silicone. The above materials have good optical properties, and combined with the tapered structure of the light trapping portion 113, a prism refraction effect is formed, so that the light trapping portion 113 has a higher light refractive index, thereby improving the light trapping effect of the isolation layer 110.

[0045] In some embodiments, the method for forming the light trapping portion 113 includes: providing a mold having a plurality of recessed portions, the shape of the recessed portions being the same as the shape of the light trapping portion 113; injecting molten light trapping material into the recessed portions of the mold, the light trapping material including at least one of polymethyl methacrylate, polystyrene, polycarbonate or silicone, and cooling and fixing to form the light trapping portion 113. The light trapping portion 113 of the corresponding shape and size can be obtained by adjusting the shape and size of the recessed portions on the mold.

[0046] The size of the light trapping portion 113 needs to be within an appropriate range so that the light trapping portion 113 has a better light refraction effect.

[0047] The bottom width of the light trapping portion 113 is 5 μm to 50 μm, such as 5 μm, 6 μm, 9 μm, 10 μm, 15 μm, 18 μm, 20 μm, 22 μm, 25 μm, 30 μm, 34 μm, 36 μm, 40 μm, 44 μm, 49 μm or 50 μm.

[0048] The height of the light trapping portion 113 relative to the surface of the second isolation layer 112 is 20μm-60μm, specifically 20μm, 22μm, 25μm, 28μm, 30μm, 33μm, 36μm, 39μm, 40μm, 45μm, 50μm, 52μm, 57μm or 60μm.

[0049] The gap width between the bottoms of adjacent light trapping portions 113 is 10 μm to 50 μm, such as 10 μm, 15 μm, 18 μm, 20 μm, 22 μm, 25 μm, 30 μm, 34 μm, 36 μm, 40 μm, 44 μm, 49 μm or 50 μm. The gap width between the light trapping portions 113 is within a suitable range. On the one hand, it can avoid the problem of stress concentration caused by mutual compression between adjacent light trapping portions 113, resulting in the fragmentation of the battery body 100; on the other hand, when the angle of a single light trapping portion 113 changes, it will not affect other light trapping portions 113, which is conducive to maintaining the isolation layer 110 as a whole with a good light trapping effect.

[0050] exist Figures 2 to 5 In the embodiment, the top of the light trapping portion 113 is a sharp corner. In other embodiments, the top of the light trapping portion is an arc chamfer, so as to avoid excessive concentration of stress on the first isolation layer by the light trapping portion, thereby causing the problem of fragmentation of the battery body.

[0051] exist Figure 2 and Figure 4 In the example, the top of the light trapping portion 113 just contacts the first isolation layer 111. In other embodiments, the top of the light trapping portion is partially embedded in the first isolation layer, which is beneficial to keep the top of the light trapping portion always facing the battery body, thereby maintaining the light trapping effect of the isolation layer.

[0052] In some embodiments, the second isolation layer 112 is fixed to the bottom of the light trapping portion 113 by an adhesive, and the type of the adhesive is selected from one or more of chloroprene rubber, styrene-butadiene-styrene block copolymer rubber, polyurethane or acrylic. In other embodiments, the bottom of the light trapping portion is partially embedded in the second isolation layer, and the relative position of the light trapping portion is fixed by the second isolation layer, which is also conducive to the neat arrangement of the light trapping portions.

[0053] The material of the second isolation layer 112 includes at least one of polyethylene terephthalate, ethylene / vinyl acetate copolymer, or polyolefin elastomer.

[0054] In some embodiments, the second isolation layer is a single-layer structure. When the first isolation layer is also a single-layer structure, the melting point of the material of the second isolation layer is higher than the melting point of the material of the first isolation layer. When the first isolation layer is a multi-layer structure, the melting point of the material of the second isolation layer is at least higher than the melting point of the material of the layer closest to the second isolation layer in the first isolation layer. This is beneficial for the second isolation layer to maintain a good shape in the subsequent lamination process to ensure that the light trapping parts can be neatly arranged.

[0055] In other embodiments, the second isolation layer is a multi-layer structure. For example, the second isolation layer includes multiple layers of sub-material layers stacked in sequence in a direction away from the battery body, and the melting points of the materials in the multiple layers of sub-material layers increase in sequence in the direction away from the battery body. When the first isolation layer is also a single-layer structure, the melting point of the material of the layer closest to the first isolation layer in the second isolation layer is higher than the melting point of the material of the first isolation layer. When the first isolation layer is a multi-layer structure, the melting point of the material of the layer closest to the first isolation layer in the second isolation layer is higher than the melting point of the material of the layer closest to the second isolation layer in the first isolation layer. This is beneficial for the second isolation layer to maintain a good shape in the subsequent lamination process to ensure that the light trapping parts can be arranged neatly.

[0056] In some embodiments, the isolation layer 110 is bonded to the surface of the battery body 100 by an adhesive.

[0057] In some embodiments, the surface of the battery body has a grid line (not shown in the figure), and the thickness of the isolation layer is greater than the height of the grid line in the direction perpendicular to the surface of the battery body. In this way, when adjacent photovoltaic cells are stacked, the isolation layer can prevent the grid line from causing damage to the surface of adjacent photovoltaic cells, thereby maintaining a high yield of the photovoltaic cells.

[0058] When the surface of the battery body has a grid line, since the top of the grid line is raised relative to the surface of the battery body, the isolation layer conformally covers the grid line after covering the surface of the battery body, and the bottom surface of the light trapping portion (i.e., the surface in contact with the second isolation layer) may form an angle with the surface of the battery body, and the angle ranges from 0° to 30°, such as 0°, 2°, 5°, 8°, 10°, 13°, 16°, 19°, 20°, 24°, 26°, 28° or 30°, etc. The arrangement of the light trapping portion is fixed and maintained by the second isolation layer, so that the light trapping portion is still facing the surface of the battery body after being tilted, so that the isolation layer as a whole has a good light trapping effect.

[0059] exist Figure 1 In the embodiment, the isolation layer 110 is in a strip shape, which does not limit the shape of the isolation layer 110. The shape of the isolation layer can be adjusted according to the actual application scenario. In other embodiments, the shape of the isolation layer also includes a circle, an ellipse, a trapezoid or a triangle, or the isolation layer covers the entire surface of the battery body.

[0060] exist Figures 2 to 5 In the embodiment, the isolation layer 110 is only located on one side of the battery body 100. In other embodiments, the isolation layer is also located on both side surfaces of the battery body.

[0061] In the photovoltaic cell provided in the embodiment of the present application, an isolation layer 110 is provided on the surface of the battery body 100, and the isolation layer 110 is used to isolate adjacent battery bodies 100, so as to avoid the problem that the surface of the photovoltaic cell is scratched due to direct contact between adjacent photovoltaic cells when stacked, thereby avoiding the photoelectric conversion performance of the photovoltaic cell from being affected, and improving the yield of the photovoltaic cell. In addition, the isolation layer 110 includes a first isolation layer 111, a light trapping portion 113 and a second isolation layer 112 sequentially arranged on the surface of the battery body 100, and the shape of the light trapping portion 113 is a cone, the top of the cone faces the first isolation layer 111, and the bottom of the cone faces the second isolation layer 112, so that when sunlight is irradiated on the surface of the battery body 100, the light trapping portion 113 can play a light trapping role to improve the light absorption efficiency of the photovoltaic cell. The photovoltaic cell provided in the embodiment of the present application does not require additional isolation paper to isolate adjacent photovoltaic cells, reduces the use cost of isolation paper and the risk of failure caused by isolation paper, improves the yield of the photovoltaic cell, and also improves the light conversion performance of the photovoltaic cell.

[0062] Correspondingly, another embodiment of the present application further provides a photovoltaic module, a plurality of battery bodies and welding strips as in the above embodiment. The photovoltaic module provided in another embodiment of the present application will be described in detail below in conjunction with the accompanying drawings. For the parts that are the same or corresponding to the previous embodiment, reference can be made to the corresponding description of the previous embodiment, and will not be described in detail below.

[0063] Figure 6 A top view of a photovoltaic module provided in an embodiment of the present application.

[0064] refer to Figure 6 The photovoltaic module includes: a battery body 100 and a welding strip 200. The welding strip 200 is located between the battery body 100 and the isolation layer 110. The welding strip 200 is used to connect two adjacent battery bodies 100. The welding strip 200 is used to connect two adjacent battery bodies 100 in series or in parallel. The isolation layer 110 can play a role in fixing the welding strip 200. At the same time, the isolation layer 110 also has a light trapping effect, which can improve the light absorption efficiency of the photovoltaic module.

[0065] refer to Figure 6In some embodiments, the isolation layer 110 is also located between adjacent battery bodies 100, and the first isolation layer of the isolation layer 110 covers the multiple welding strips 200 located between two adjacent battery bodies 100. The two ends of the welding strip 200 are respectively fixed to the surface of the battery body 100, the middle part of the welding strip 200 is located between the adjacent battery bodies 100, and the first isolation layer of the isolation layer 110 covers the multiple welding strips 200 located between the two adjacent battery bodies 100. On the one hand, it plays a role in fixing the welding strip 200 during the subsequent transportation and storage process. On the other hand, due to the presence of the isolation layer 110, more light can be refracted to the backlight surface of the battery body 100 in the gap between the adjacent battery bodies 100, which is beneficial to improve the light utilization rate of the photovoltaic module and improve the light conversion efficiency of the photovoltaic module.

[0066] In some embodiments, the photovoltaic module also includes an encapsulation layer, which covers and wraps the surface of the photovoltaic cell. The material of the encapsulation layer is an organic encapsulation film such as ethylene-vinyl acetate copolymer (EVA) film, polyethylene octene co-elastomer (POE) film or polyvinyl butyral (PVB) film.

[0067] In some embodiments, the photovoltaic module further comprises a cover plate, which is located on the surface of the encapsulation layer away from the photovoltaic cell, and the cover plate is a glass cover plate, a plastic cover plate or the like with light-transmitting function. In some embodiments, the surface of the cover plate facing the encapsulation layer is a concave-convex surface, further increasing the utilization rate of the incident light.

[0068] In the photovoltaic module provided in the embodiment of the present application, an isolation layer 110 is arranged on the surface of the battery body 100, and the isolation layer 110 includes a first isolation layer 111, a light trapping portion 113 and a second isolation layer 112 which are arranged in sequence on the surface of the battery body 100. The light trapping portion 113 is in the shape of a cone, with the top of the cone facing the first isolation layer 111 and the bottom of the cone facing the second isolation layer 112. In this way, when sunlight is irradiated on the surface of the battery body 100, the light trapping portion 113 can play a light trapping role to improve the light absorption efficiency of the photovoltaic cell.

[0069] Those skilled in the art will appreciate that the above-mentioned embodiments are specific examples for implementing the present application, and in practical applications, various changes may be made to the embodiments in form and detail without departing from the spirit and scope of the present application. Any person skilled in the art may make various changes and modifications without departing from the spirit and scope of the present application, and therefore the scope of protection of the present application shall be subject to the scope defined in the claims.

Claims

1. A photovoltaic cell, characterized in that: include: A battery body, wherein the surface of the battery body has an isolation layer, and the isolation layer is used to isolate adjacent battery bodies; The isolation layer comprises: a first isolation layer, wherein the first isolation layer covers a surface of the battery body; a second isolation layer, the second isolation layer being located on a side of the first isolation layer away from the battery body; A plurality of light trapping portions are provided, wherein the light trapping portions are located between the first isolation layer and the second isolation layer, and the light trapping portions are in the shape of a cone, wherein the top of the cone faces the first isolation layer, and the bottom of the cone faces the second isolation layer.

2. The photovoltaic cell according to claim 1, characterized in that: The material of the first isolation layer includes at least one of polyethylene terephthalate, ethylene / vinyl acetate copolymer or polyolefin elastomer; the material of the light trapping portion includes at least one of polymethyl methacrylate, polystyrene, polycarbonate or silicone; the material of the second isolation layer includes at least one of polyethylene terephthalate, ethylene / vinyl acetate copolymer or polyolefin elastomer.

3. The photovoltaic cell according to claim 1, characterized in that: The first isolation layer includes a first sub-isolation layer and a second sub-isolation layer, the first sub-isolation layer is located on the surface of the battery body, the second sub-isolation layer is located on the side of the first sub-isolation layer away from the battery body, and the melting point of the material of the first sub-isolation layer is lower than the melting point of the material of the second sub-isolation layer.

4. The photovoltaic cell according to claim 1, characterized in that: The surface of the battery body has a grid line, and in a direction perpendicular to the surface of the battery body, the thickness of the isolation layer is greater than the height of the grid line.

5. The photovoltaic cell according to claim 1, characterized in that: The bottom width of the light trapping portion is 5 μm to 50 μm; the height of the light trapping portion relative to the surface of the second isolation layer is 20 μm to 60 μm.

6. The photovoltaic cell according to claim 1, characterized in that: The width of the gap between the bottoms of adjacent light trapping portions is 10 μm to 50 μm.

7. The photovoltaic cell according to claim 1, characterized in that: The first isolation layer and the second isolation layer are spaced apart from each other, and an isolation gas is filled between adjacent light trapping portions.

8. The photovoltaic cell according to claim 1, characterized in that: The first isolation layer fills the gaps between the light trapping portions and contacts the second isolation layer.

9. A photovoltaic module, characterized in that: include: A plurality of battery bodies as claimed in any one of claims 1 to 8; A welding strip is located between the battery body and the isolation layer, and is used to connect two adjacent battery bodies.

10. The photovoltaic module according to claim 9, characterized in that: The isolation layer is also located between adjacent battery bodies, and a first isolation layer of the isolation layer covers the plurality of welding strips located between two adjacent battery bodies.

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