Photovoltaic cells and photovoltaic modules

Abstract

The present application relates to the field of photovoltaic technology, and provides a photovoltaic cell and a photovoltaic module, which are at least beneficial to improving the efficiency and yield of the photovoltaic cell. The photovoltaic cell includes: a cell body, the surface of the cell body has an isolation layer, and the isolation layer is used to isolate adjacent cell bodies; the isolation layer includes: a first isolation layer that covers the surface of the cell body; a second isolation layer that is located on the side of the first isolation layer away from the cell body; and a plurality of light trapping portions that are located between the first isolation layer and the second isolation layer. The shape of the light trapping portion is a cone, the top of the cone faces the first isolation layer, and the bottom of the cone faces the second isolation layer.

Description

Technical Field

[0001] This application relates to the field of photovoltaic technology, and particularly to a photovoltaic cell and a photovoltaic module. Background Art

[0002] A photovoltaic module is a component that generates electricity using the photovoltaic effect, usually composed of a photovoltaic cell, a solder ribbon, a glue film, and a cover plate. The photovoltaic cell is an important part of the main component. When storing and transporting photovoltaic cells, multiple photovoltaic cells are directly stacked. Since there are electrodes on the surface of the photovoltaic cell, adjacent photovoltaic cells directly contact each other when stacked, which is extremely likely to scratch the surface of the photovoltaic cell by friction, thereby reducing the light absorption of the photovoltaic cell and further causing a decline in the photoelectric conversion performance of the photovoltaic cell.

[0003] Currently, in order to reduce the possibility of the surface of the photovoltaic cell being scratched due to stacked transportation of the photovoltaic cell, an operator places an isolation paper between two adjacent photovoltaic cells. However, the isolation paper is difficult to remove and is easily brought into the production line, causing a malfunction; moreover, the utilization rate of the isolation paper is low and the consumption is large, resulting in an increase in cost. Summary of the Invention

[0004] The embodiments of this application provide a photovoltaic cell and a photovoltaic module, which at least help to improve the efficiency and yield of the photovoltaic cell.

[0005] According to some embodiments of this application, on the one hand, an embodiment of this application provides a photovoltaic cell, including: a cell body, the surface of the cell body has an isolation layer, and the isolation layer is used to isolate adjacent cell bodies; the isolation layer includes: a first isolation layer, the first isolation layer covers the surface of the cell body; a second isolation layer, the second isolation layer is located on the side of the first isolation layer away from the cell body; a plurality of light-trapping parts, the light-trapping parts are located between the first isolation layer and the second isolation layer, the shape of the light-trapping part is a cone, the top of the cone faces the first isolation layer, and the bottom of the cone faces 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 part includes at least one of polymethyl methacrylate, polystyrene, polycarbonate, or silica gel; 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 cell body, and the second sub-isolation layer is located on the side of the first sub-isolation layer away from the cell body. The melting point of the material of the first sub-isolation layer is less than the melting point of the material of the second sub-isolation layer.

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

[0009] In some embodiments, 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.

[0010] In some embodiments, the gap width between the bottoms of adjacent light-trapping portions is 10 μm to 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 gap between the light-trapping portions and is in contact with 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 module, including: a plurality of battery bodies as described in the above embodiments; a welding tape, the welding tape is located between the battery body and the isolation layer, and the welding tape is used to connect two adjacent battery bodies.

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

[0015] The technical solutions provided by the embodiments of the present application have at least the following advantages:

[0016] In the photovoltaic cell provided by the embodiments of the present application, an isolation layer is provided on the surface of the battery body. The isolation layer is used to isolate adjacent battery bodies to avoid the problem that the surface of the photovoltaic cell is scratched due to direct contact when adjacent photovoltaic cells are stacked, thereby avoiding the influence on the photoelectric conversion performance of the photovoltaic cell 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 provided on the surface of the battery body. The shape of the light-trapping portion is a cone, the top of the cone faces the first isolation layer, and the bottom of the cone faces the second isolation layer. Thus, when sunlight irradiates on the surface of the battery body, the light-trapping portion can play a role in trapping light to improve the light absorption efficiency of the photovoltaic cell. The photovoltaic cell provided by the embodiments of the present application does not require an additional isolation paper to isolate adjacent photovoltaic cells, reduces the use cost of the isolation paper and the failure risk caused by the isolation paper, improves the yield of the photovoltaic cell, and at the same time can also improve the light conversion performance of the photovoltaic cell. Description of the Drawings

[0017] One or more embodiments are exemplarily illustrated by the pictures in the corresponding drawings. These exemplary illustrations do not constitute a limitation on the embodiments. Unless otherwise stated, the drawings in the figures do not constitute a scale limitation. To more clearly illustrate the technical solutions in the embodiments of the present application or in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0018] Figure 1 It is a top view of a photovoltaic cell provided by an embodiment of the present application;

[0019] Figure 2 It is Figure 1 The first cross-sectional structure schematic diagram along the AA1 direction;

[0020] Figure 3 It is Figure 1 The second cross-sectional structure schematic diagram along the AA1 direction;

[0021] Figure 4 It is Figure 1 The third cross-sectional structure schematic diagram along the AA1 direction;

[0022] Figure 5 It is Figure 1 The fourth cross-sectional structure schematic diagram along the AA1 direction;

[0023] Figure 6 It is a top view of a photovoltaic module provided by an embodiment of the present application. Detailed implementation manners

[0024] As can be seen from the background art, when storing and transporting photovoltaic cells, operators place isolation paper between two adjacent photovoltaic cells. Since the isolation paper is difficult to take out and is easily brought into the production line, which may cause failures. Moreover, the utilization rate of the isolation paper is low and the consumption is large, resulting in an increase in cost.

[0025] The embodiments of the present application provide a photovoltaic cell and a photovoltaic module. 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 the storage and transportation of photovoltaic cells. There is no need for additional isolation paper to isolate adjacent photovoltaic cells, reducing the use cost of the isolation paper and the failure risk caused by the 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, and further improve the light conversion performance of the photovoltaic cell.

[0026] 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 specifying the quantity, specific order, or primary-secondary relationship of the indicated technical features.

[0027] In the description of the embodiments of the present application, the meaning of "a plurality of" is more than two, unless otherwise specifically and clearly defined.

[0028] Referring to "embodiments" herein means that the specific features, structures, or characteristics described in connection with the embodiments may be included in at least one embodiment of the present application. The phrase appearing in various positions in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art will explicitly and implicitly understand that the embodiments described herein may be combined with other embodiments.

[0029] In the description of the embodiments of the present application, the orientation or positional relationship indicated by technical terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the embodiments of the present application and simplifying the description, rather than indicating or implying that the indicated device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be understood as a limitation on the embodiments of the present application.

[0030] In the description of the embodiments of the present application, unless otherwise clearly specified and defined, technical terms such as "installed", "connected", "coupled", "fixed", etc. should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may also be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside 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 specific circumstances.

[0031] In the accompanying drawings corresponding to the embodiments of the present application, for better understanding and convenience of description, the thickness and area of the layers are enlarged. When describing that one component is on another component or on the surface of another component, the component can be "directly" on the surface of the other component, or there can be a third component between the two components. On the contrary, when describing that one component is on the surface of another component or one component surface forms or is provided with another component, it means that there is no third component between the two components. In addition, when describing that one component is "substantially" formed on another component, it means that the component is not formed on the entire surface (or front surface) of the other component, nor on a partial edge of the entire surface.

[0032] In the description of the embodiments of the present application, when a certain component "includes" another component, unless otherwise specified, other components are not excluded, and other components may further be included.

[0033] The terms used in the description of the various embodiments herein are only for describing specific embodiments and are not intended to be limiting. As used in the description of the various embodiments and the appended claims, "component" is also intended to include the plural form, unless the context clearly indicates otherwise.

[0034] The following will elaborate on the embodiments of the present application in conjunction with the accompanying drawings. However, those of ordinary skill in the art can understand that in the embodiments of the present application, many technical details are presented for 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 solutions claimed in the present application can still be implemented.

[0035] Figure 1 A top view of a photovoltaic cell provided for an embodiment of the present application; Figure 2 is Figure 1 a first cross-sectional structure schematic diagram along the AA1 direction; Figure 3 is Figure 1 a second cross-sectional structure schematic diagram along the AA1 direction; Figure 4 is Figure 1 a third cross-sectional structure schematic diagram along the AA1 direction; Figure 5 is Figure 1 a fourth cross-sectional structure schematic diagram along the AA1 direction.

[0036] Refer to Figure 1 , the photovoltaic cell provided for the embodiment of the present application includes: a battery body 100 and an isolation layer 110 located on the surface of the battery body 100, and the isolation layer 110 is used to isolate adjacent battery bodies 100. Refer to 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. 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 portions 113 are located between the first isolation layer 111 and the second isolation layer 112, 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.

[0037] In the photovoltaic cell provided by the embodiment of the present application, an isolation layer 110 is provided on the surface of the battery body 100. The isolation layer 110 is used to isolate adjacent battery bodies 100 to avoid the problem that the surface of the photovoltaic cell is scratched when adjacent photovoltaic cells are stacked and placed directly in contact, thereby avoiding the influence on the photoelectric conversion performance of the photovoltaic cell 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 that are sequentially arranged on the surface of the battery body 100. 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. In this way, when sunlight irradiates on the surface of the battery body 100, the light-trapping portion 113 can play a role in light trapping to improve the light absorption efficiency of the photovoltaic cell. The photovoltaic cell provided by the embodiment of the present application does not require additional isolation paper to isolate adjacent photovoltaic cells, reduces the use cost of the isolation paper and the failure risk caused by the isolation paper, improves the yield of the photovoltaic cell, and can also improve the light conversion performance of the photovoltaic cell.

[0038] In some embodiments, the type of the battery body 100 is one of a monocrystalline silicon solar cell, a polycrystalline silicon solar cell, an amorphous silicon solar cell, or a multi-component compound solar cell. The multi-component compound solar cell specifically includes a cadmium sulfide solar cell, a gallium arsenide solar cell, a copper indium selenide solar cell, or a perovskite solar cell.

[0039] 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.

[0040] Reference Figure 2 or Figure 4 , in 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. The isolation gas is filled between adjacent light-trapping portions 113. On the one hand, it is beneficial to keep the top of the light-trapping portion 113 always facing the battery body 100 to maintain the neat arrangement of the light-trapping portions 113, thereby facilitating the refraction of sunlight and improving the absorption efficiency of the photovoltaic cell for sunlight; on the other hand, the isolation gas also plays a buffering role, avoiding the problem of breakage of the photovoltaic cell due to excessive stress between adjacent photovoltaic cells when isolating adjacent photovoltaic cells.

[0041] It should be noted that in Figure 2 or Figure 4 , 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 isolation gas is filled between the light-trapping portions 113, the edges of the first isolation layer 111 and the second isolation layer 112 are connected to each other to improve the sealing effect of the isolation gas in the isolation layer 110.

[0042] In some embodiments, when there is a gap between the first isolation layer 111 and the second isolation layer 112 and there is isolation gas between adjacent light-trapping portions 113, the method for forming the isolation layer 110 includes: providing the second isolation layer 112; coating an adhesive on the surface of the second isolation layer 112; bonding the bottoms of a 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 periphery of the first isolation layer 111 to the second isolation layer 112 to achieve a sealing effect. To improve the stability of the relative position between the light-trapping portion 113 and the first isolation layer 111, by appropriately raising the temperature, after the first isolation layer 111 is slightly melted, a part of the top of the light-trapping portion 113 is embedded into the first isolation layer 111. In other embodiments, the way of fixing the light-trapping portion 113 on the surface of the second isolation layer 112 is to heat the second isolation layer 112 until it is slightly melted, and a part of the bottom of the light-trapping portion 113 is embedded into 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 melting and then cooling and solidifying.

[0043] Reference Figure 3 Or Figure 5 , in some other embodiments, the first isolation layer 111 fills the gap between the light-trapping portions 113 and is in contact with the second isolation layer 112. In this way, the light-trapping portion 113 is completely wrapped between the first isolation layer 111 and the second isolation layer 112, so as to keep the position of the light-trapping portion 113 from changing as much as possible, and further keep the isolation layer 110 having a good light-trapping effect.

[0044] In some embodiments, when the first isolation layer 111 fills the gap between the light-trapping portions 113 and is in contact with the second isolation layer 112, the method for forming the isolation film 110 includes: providing the second isolation layer 112; referring to the above method for forming the isolation layer 110, fixing the light-trapping portion 113 on the surface of the second isolation layer 112; providing the second isolation layer 111, heating and melting the first isolation layer 111 so that the first isolation layer 111 fills the gap between the light-trapping portions 113, and after cooling and solidifying, the first isolation layer 111 fills the gap between the light-trapping portions 113 and is in contact with the second isolation layer 112.

[0045] The material of the first isolation layer 111 includes at least one of polyethylene terephthalate, ethylene / vinyl acetate copolymer, or polyolefin elastomer.

[0046] Reference Figure 2 And Figure 3 , in some embodiments, the first isolation layer 111 is a single-layer structure.

[0047] Reference Figure 4 And Figure 5, in some 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, and the second sub-isolation layer 1112 is located on the side of the first sub-isolation layer 1111 away from the battery body 100. The melting point of the material of the first sub-isolation layer 1111 is less 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 means of hot melting. 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 beneficial to maintaining the arrangement state of the light-trapping part 113, and thus maintaining the good light-trapping effect of the isolation layer 110.

[0048] In other embodiments, the number of layers of the first isolation layer is 3, 4 or 5. In the direction away from the battery body, the melting points of the materials of the multi-layer sub-isolation layers increase in sequence, so that the sub-isolation layer closest to the battery body has a good bonding effect with the battery body, avoiding the overall shedding or offset of the isolation layer, and at the same time being beneficial to maintaining the arrangement form of the light-trapping part.

[0049] Reference Figure 4 and Figure 5 , when 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 thinner thickness can avoid excessive deformation of the melted first sub-isolation layer 1111 causing deformation of the arrangement of the light-trapping part 113, and the thicker thickness of the second sub-isolation layer 1112 is beneficial to maintaining the arrangement form of the light-trapping part 113.

[0050] The material of the light-trapping part 113 includes at least one of polymethyl methacrylate, polystyrene, polycarbonate or silica gel. The above materials have good optical properties. Combining with the conical structure of the light-trapping part 113, the refraction effect of the prism is formed, so that the light-trapping part 113 has a high light refractive index, improving the light-trapping effect of the isolation layer 110.

[0051] In some embodiments, the forming method of the light-trapping part 113 includes: providing a mold with a plurality of recessed parts on it, and the shape of the recessed parts is the same as the shape of the light-trapping part 113; injecting molten light-trapping material into the recessed parts of the mold, and the light-trapping material includes at least one of polymethyl methacrylate, polystyrene, polycarbonate or silica gel, and forming the light-trapping part 113 after cooling and solidification. By adjusting the shape and size of the recessed parts on the mold, the light-trapping part 113 with the corresponding shape and size can be obtained.

[0052] The size of the light trapping portion 113 needs to be within an appropriate range so that the light trapping portion 113 has a good light refraction effect.

[0053] The bottom width of the light trapping portion 113 is 5 μm to 50 μm, specifically 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.

[0054] The height of the light trapping portion 113 relative to the surface of the second isolation layer 112 is 20 μm to 60 μm, specifically such as 20 μm, 22 μm, 25 μm, 28 μm, 30 μm, 33 μm, 36 μm, 39 μm, 40 μm, 45 μm, 50 μm, 52 μm, 57 μm or 60 μm.

[0055] The gap width between the bottoms of adjacent light trapping portions 113 is 10 μm to 50 μm, specifically 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 extrusion between adjacent light trapping portions 113, resulting in 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 a good light trapping effect of the overall isolation layer 110.

[0056] In Figures 2 to 5 taking the top of the light trapping portion 113 as a sharp corner as an example. In other embodiments, the top of the light trapping portion is an arc chamfer, so as to avoid the problem of stress concentration of the light trapping portion on the first isolation layer, resulting in fragmentation of the battery body.

[0057] In Figure 2 and Figure 4 taking the top of the light trapping portion 113 just contacting the first isolation layer 111 as an example. In other embodiments, a part of the top of the light trapping portion is embedded in the first isolation layer, which is conducive to keeping the top of the light trapping portion always facing the battery body, and further conducive to maintaining the light trapping effect of the isolation layer.

[0058] In some embodiments, the second isolation layer 112 and the bottom of the light trapping portion 113 are fixed 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 acid. In other embodiments, a part of the bottom of the light trapping portion is embedded in the second isolation layer, and the relative position of the light trapping portion is fixed by the second isolation layer, and it is also conducive to the neat arrangement of the light trapping portions.

[0059] The material of the second isolation layer 112 includes at least one of polyethylene terephthalate, ethylene / vinyl acetate copolymer, or polyolefin elastomer.

[0060] 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 that 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 greater than the melting point of the layer of material in the first isolation layer that is closest to the second isolation layer. This is beneficial for the second isolation layer to maintain a good morphology in the subsequent lamination process to ensure that the light-trapping portions can be neatly arranged.

[0061] In other embodiments, the second isolation layer is a multi-layer structure. For example, the second isolation layer includes multiple sub-material layers stacked in sequence in the direction away from the battery body. In the direction away from the battery body, the melting points of the materials of the multiple sub-material layers increase in sequence. When the first isolation layer is also a single-layer structure, the melting point of the layer of material in the second isolation layer that is closest to the first isolation layer is higher than that of the material of the first isolation layer. When the first isolation layer is a multi-layer structure, the melting point of the layer of material in the second isolation layer that is closest to the first isolation layer is higher than that of the layer of material in the first isolation layer that is closest to the second isolation layer. This is beneficial for the second isolation layer to maintain a good morphology in the subsequent lamination process to ensure that the light-trapping portions can be neatly arranged.

[0062] In some embodiments, the isolation layer 110 is adhered to the surface of the battery body 100 through an adhesive.

[0063] In some embodiments, the surface of the battery body has grid lines (not shown in the figure). In the direction perpendicular to the surface of the battery body, the thickness of the isolation layer is greater than the height of the grid lines. Thus, when adjacent photovoltaic cells are stacked, the isolation layer can prevent the grid lines from damaging the surfaces of adjacent photovoltaic cells, thereby maintaining a high yield of the photovoltaic cells.

[0064] When the surface of the battery body has grid lines, since the top of the grid lines protrudes relative to the surface of the battery body, after the isolation layer covers the surface of the battery body, it conformally covers the grid lines. 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 range of the angle is 0° to 30°, specifically such as 0°, 2°, 5°, 8°, 10°, 13°, 16°, 19°, 20°, 24°, 26°, 28°, or 30°, etc. The arrangement of the light-trapping portions is fixed and maintained by the second isolation layer so that the light-trapping portions still face the surface of the battery body after tilting, thereby enabling the isolation layer as a whole to have a good light-trapping effect.

[0065] In Figure 1In the case where the isolation layer 110 is strip-shaped, it 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, a triangle, etc., or the isolation layer covers the entire surface of the battery body.

[0066] In Figures 2 to 5 In the case where the isolation layer 110 is only located on one side surface of the battery body 100. In some other embodiments, the isolation layer is also located on both side surfaces of the battery body.

[0067] In the photovoltaic cell provided by the embodiment of the present application, an isolation layer 110 is provided on the surface of the battery body 100. 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 when adjacent photovoltaic cells are stacked, and further avoid the influence on the photoelectric conversion performance of the photovoltaic cell, and improve the yield of the photovoltaic cell. In addition, the isolation layer 110 includes a first isolation layer 111, a light trapping part 113, and a second isolation layer 112 that are sequentially arranged on the surface of the battery body 100. The shape of the light trapping part 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. In this way, when sunlight irradiates on the surface of the battery body 100, the light trapping part 113 can play a role in light trapping to improve the light absorption efficiency of the photovoltaic cell. The photovoltaic cell provided by the embodiment of the present application does not require an additional isolation paper to isolate adjacent photovoltaic cells, reduces the use cost of the isolation paper and the failure risk caused by the isolation paper, improves the yield of the photovoltaic cell, and also improves the light conversion performance of the photovoltaic cell.

[0068] Correspondingly, another embodiment of the present application also provides a photovoltaic module, including a plurality of battery bodies and solder tapes as described in the above embodiments. The following will describe in detail the photovoltaic module provided by another embodiment of the present application. For the same or corresponding parts as the previous embodiment, reference may be made to the corresponding description of the previous embodiment, and the following will not be elaborated in detail.

[0069] Figure 6 It is a top view of a photovoltaic module provided by an embodiment of the present application.

[0070] Refer to Figure 6 As shown, the photovoltaic module includes: a battery body 100 and a solder tape 200. The solder tape 200 is located between the battery body 100 and the isolation layer 110, and the solder tape 200 is used to connect two adjacent battery bodies 100. The solder tape 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 solder tape 200, and at the same time, the isolation layer 110 also has a light trapping effect and can improve the light absorption efficiency of the photovoltaic module.

[0071] Refer toFigure 6 In some embodiments, the isolation layer 110 is also located between adjacent battery bodies 100. The first isolation layer of the isolation layer 110 covers multiple busbars 200 located between two adjacent battery bodies 100. Both ends of the busbar 200 are respectively fixed on the surface of the battery body 100, and the middle part of the busbar 200 is located between adjacent battery bodies 100. The first isolation layer of the isolation layer 110 covers multiple busbars 200 located between two adjacent battery bodies 100. On the one hand, it plays a role in fixing the busbar 200 during subsequent transportation and storage. On the other hand, due to the existence of the isolation layer 110, more light can be refracted to the backlight surface of the battery body 100 at the gap between adjacent battery bodies 100, which is beneficial to improving the light utilization rate of the photovoltaic module and the light conversion efficiency of the photovoltaic module.

[0072] In some embodiments, the photovoltaic module further includes a packaging layer that covers and wraps the surface of the photovoltaic cell. The material of the packaging layer is an organic packaging film such as ethylene-vinyl acetate copolymer (EVA) film, polyolefin elastomer (POE) film, or polyvinyl butyral (PVB) film.

[0073] In some embodiments, the photovoltaic module further includes a cover plate located on the surface of the packaging layer away from the photovoltaic cell. The cover plate is a cover plate with a light-transmitting function such as a glass cover plate or a plastic cover plate. In some embodiments, the surface of the cover plate facing the packaging layer is an uneven surface, which further increases the utilization rate of incident light.

[0074] In the photovoltaic module provided by the embodiments of the present application, an isolation layer 110 is provided on the surface of the battery body 100. The isolation layer 110 includes a first isolation layer 111, a light-trapping portion 113, and a second isolation layer 112 sequentially provided on the surface of the battery body 100. 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. Thus, when sunlight shines on the surface of the battery body 100, the light-trapping portion 113 can play a role in light trapping to improve the light absorption efficiency of the photovoltaic cell.

[0075] Those of ordinary skill in the art can understand that the above embodiments are specific embodiments for implementing the present application. In actual applications, various changes can be made in form and details without departing from the spirit and scope of the present application. Any person skilled in the art can make various changes and modifications without departing from the spirit and scope of the present application. Therefore, the protection scope of the present application should be subject to the scope defined by 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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