Photovoltaic module and solar cell

Abstract

The utility model relates to a photovoltaic module and a solar cell. The solar cell comprises a cell piece, a conductive wire and a protection piece. And the conductive wire is connected to the surface of the battery piece. The protection part is connected to the outer surface of the electric lead and further connected with the battery piece, and the outer surface of the protection part can be used for directly reflecting sunlight to the battery piece and / or reflecting the sunlight to a first interface of the glass and the air and reflecting the sunlight to the battery piece through the first interface. On one hand, light loss caused by the fact that incident light is directly reflected back to the glass along the original path in the prior art can be avoided, so that the secondary utilization rate of the light is improved, and the power output of the photovoltaic module can be improved; and on the other hand, the protection piece not only plays a protection role, but also enables the conductive wire to be arranged on the battery piece more stably, so that the defect of falling off is prevented.

Description

Technical Field

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

[0002] With the development of photovoltaic technology, photovoltaic modules are becoming increasingly widely used. They typically consist of solar cells, grid lines attached to the cells, solder ribbons connected to the grid lines, and busbars connected to the ribbons. The busbars are connected to the junction box. During operation, the solar cells are illuminated by light and generate charge carriers. The grid lines collect these charge carriers and transfer them to the solder ribbons. The carriers are then collected by the solder ribbons and transferred to the busbars, which then output them to the junction box.

[0003] There are two main types of gate line structures in the related art. Figure 1 Typically, a copper substrate 110 is formed on the surface of the cell using an electroplating process using base metal copper. Tin 120 is then plated on the outer surface of the copper substrate 110 to prevent oxidation. However, the grid lines formed on the cell surface by copper electroplating technology are relatively flat, with a rectangular or nearly rectangular cross-section along the extension direction. When light strikes the grid line surface, it returns along the original path to the glass surface, weakening the grid line's utilization of secondary total reflection of incident sunlight, resulting in reduced power output of the photovoltaic module. Furthermore, the grid lines are prone to defects such as detachment. For another type of grid line, see [the following text appears to be unrelated and should be omitted]. Figure 2 Silver paste gridlines 130 are typically formed on the surface of the cell by printing silver paste. However, due to the printing method, these gridlines 130 are formed into a tapered structure with a large base and a small top. The tapered outer surface facilitates secondary light reflection, which can improve photoelectric conversion efficiency. However, this leads to high material costs and the risk of gridlines easily falling off. Furthermore, other conductive lines, such as solder ribbons and busbars, are also at risk of falling off. Utility Model Content

[0004] Based on this, it is necessary to overcome the defects of the existing technology and provide a photovoltaic module and solar cell, which can improve the utilization rate of light while preventing the conductive wire from falling off and having better stability.

[0005] A solar cell, comprising:

[0006] Battery cells;

[0007] Conductive wires connected to the surface of the battery cell; and

[0008] A protective member connected to the outer surface of the conductive wire, the protective member is also connected to the solar cell, and the outer surface of the protective member can be used to reflect sunlight directly onto the solar cell and / or reflect sunlight to the first interface between the glass and air of the photovoltaic module and reflect it from the first interface to the solar cell.

[0009] In one embodiment, the protective member includes protective glue, the protective glue is connected to the outer surface of the conductive wire, and the protective glue is also connected to the battery cell.

[0010] In one embodiment, the protective member further includes a reflective layer, which is arranged on the outer surface of the protective glue; and / or the protective glue is configured as an opaque glue, and the visible light transmittance of the protective glue is less than or equal to 10%.

[0011] In one embodiment, the protective adhesive is configured as a light-transmitting adhesive, the visible light transmittance of the protective adhesive is greater than or equal to 50%, and the outer surface of the protective adhesive is directly connected to the packaging adhesive film.

[0012] In one embodiment, the protective adhesive is a hot melt, heat curing or UV curing adhesive.

[0013] In one embodiment, the protective element is completely wrapped around the outer surface of the conductive wire; and / or the protective element extends from one end of the conductive wire to the other end of the conductive wire.

[0014] In one embodiment, the cross-sectional profile of the protective element along the extension direction of the conductive line is triangular, trapezoidal, semicircular or semi-elliptical.

[0015] In one embodiment, the outer surface of the protective member includes a first inclined surface set at an angle to the surface of the battery cell; the angle between the first inclined surface and the battery cell is γ, 21.25°≤γ<45°, or 45°<γ<90°.

[0016] In one embodiment, the conductive wire is at least one of a grid line, a welding strip and a bus bar; and / or the cross-sectional profile of the conductive wire along its extension direction is rectangular; and / or the conductive wire is plated on the surface of the battery cell.

[0017] A photovoltaic assembly comprises the solar cell, an encapsulating film and glass, wherein the glass is connected to the cell sheet via the encapsulating film, and the encapsulating film is also connected to the protective element.

[0018] In the above-mentioned photovoltaic modules and solar cells, on the one hand, the outer surface of the protective member can be used to reflect sunlight directly onto the cell and / or reflect sunlight to the first interface between glass and air and reflect it from the first interface to the cell, which can avoid the loss of light caused by directly reflecting the incident light back to the glass as in the related art, thereby improving the secondary utilization rate of light and further improving the power output of the photovoltaic module; on the other hand, the protective member not only plays a protective role, but also allows the conductive wire to be more stably set on the cell to prevent falling defects. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 2 is a cross-sectional structural diagram of a gate line according to an embodiment of the related art.

[0020] Figure 2 FIG. 4 is a cross-sectional structural diagram of a gate line according to another embodiment of the related art.

[0021] Figure 3 This is a structural diagram of a photovoltaic module according to an embodiment of the present application.

[0022] Figure 4 FIG. 1 is a schematic diagram of the light path of a photovoltaic cell according to an embodiment of the present application when irradiated by sunlight.

[0023] Figure 5 FIG2 is a schematic diagram of the light path of a photovoltaic cell under sunlight irradiation according to another embodiment of the present application.

[0024] Figure 6 This is a schematic diagram of the light path of a photovoltaic cell under sunlight irradiation according to another embodiment of the present application.

[0025] 110, copper substrate; 120, metallic tin; 130, silver paste grid line;

[0026] 210, battery cell; 220, conductive wire; 230, protective member; 231, first inclined surface; 232, second inclined surface; 240, encapsulation film; 250, glass; 260, first interface; 270, second interface; 281, incident light; 282, first portion of light; 283, second portion of light; 284, first reflected light; 285, second reflected light. DETAILED DESCRIPTION

[0027] To make the above-mentioned objects, features, and advantages of the present application more clearly understood, the specific embodiments of the present application are described in detail below with reference to the accompanying drawings. The following description sets forth many specific details to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways than those described herein, and those skilled in the art can make similar improvements without violating the scope of the present application. Therefore, the present application is not limited to the specific embodiments disclosed below.

[0028] See Figure 3 and Figure 4 , Figure 3 The structure diagram of a photovoltaic module according to an embodiment of the present application is shown. Figure 4 A schematic diagram of the light path of a photovoltaic cell according to one embodiment of the present application when exposed to sunlight is shown. A solar cell according to one embodiment of the present application is used in a photovoltaic module. The photovoltaic module includes an encapsulating film 240 and glass 250. Glass 250 is connected to the solar cell via the encapsulating film 240. The solar cell includes a cell 210, a conductive wire 220, and a protective member 230. The conductive wire 220 is connected to the surface of the cell 210.

[0029] The conductive line 220 includes but is not limited to at least one of a grid line, a welding strip, and a bus bar. The grid line can be either a secondary grid line or a main grid line.

[0030] In this embodiment, the conductive line 220 is specifically a secondary grid line, and the cross-sectional profile of the conductive line 220 along its extension direction is rectangular or approximately rectangular. In addition, the conductive line 220 includes but is not limited to a copper substrate plated on the surface of the battery cell 210.

[0031] In addition, the protective member 230 is connected to the outer surface of the conductive wire 220, and the protective member 230 is also connected to the battery cell 210. The outer surface of the protective member 230 can be used to reflect sunlight directly onto the battery cell 210 and / or reflect sunlight to the first interface 260 between the glass 250 and the air and reflect it from the first interface 260 to the battery cell 210.

[0032] Specifically, there are not just one but multiple secondary grid lines, and all the secondary grid lines are respectively provided with protective parts 230. When the protective parts 230 are connected to the outer surface of each secondary grid line, the utilization rate of light can be effectively improved, and a better protective effect can be played, and the secondary grid line is not prone to falling off defects.

[0033] The above-mentioned solar cell, on the one hand, can avoid the loss of light caused by directly reflecting the incident light 281 back to the glass 250 along the original path as in the related art, thereby improving the secondary utilization rate of light and further improving the power output of the photovoltaic module; on the other hand, the protective member 230 not only plays a protective role, but also allows the conductive wire 220 to be more stably set on the cell 210 to prevent falling defects.

[0034] Among them, after the surface of the cell 210 absorbs more light energy, the power output of the photovoltaic module can be directly improved. Correspondingly, more light energy is converted into electrical energy instead of heat energy, which can also reduce the operating temperature of the photovoltaic module in the same period of time.

[0035] See also Figure 3 and Figure 4 In one embodiment, the protective member 230 includes a protective glue. The protective glue includes but is not limited to a hot melt type, a thermosetting type or a UV light curing type colloid. The protective glue is connected to the outer surface of the conductive wire 220, and the protective glue is also connected to the battery cell 210. In this way, compared with the method of silver plating and tin plating and the method of printing silver paste on the outer surface of the conductive wire 220 in the related art, the method of setting the protective glue on the outer surface of the conductive wire 220 in this embodiment can be more convenient for production, and the cost of the colloid material is low, the production efficiency is high, and the protective glue is bonded and fixed to the battery cell 210, with high stability, which can effectively prevent the conductive wire 220 from falling off.

[0036] On the basis of the aforementioned embodiment, the protective member 230 further includes a reflective layer. The reflective layer includes but is not limited to a film layer made of a metal material with a high reflectivity, such as aluminum foil or silver material, which can be flexibly selected according to actual needs. In addition, the protective glue serves as the main material of the protective member 230, and the reflective layer is connected to the outer surface of the protective glue. Optionally, the reflective layer can be, for example, provided on the outer surface of the protective glue by bonding, or can be, for example, formed on the outer surface of the protective glue by 3D printing technology, and so on. In this way, the reflective layer forms the outer surface of the protective member 230, and the incident light 281 incident on the outer surface of the protective member 230 will be more efficiently reflected directly onto the battery cell 210 to be utilized by the battery cell 210, or it can be reflected to the first interface 260 and then reflected by the first interface 260 to the battery cell 210 to be utilized by the battery cell 210.

[0037] It should be noted that, under the premise that the protective member 230 includes a reflective layer, the protective glue can be set as either a light-transmitting glue or a light-opaque glue, and there is no limitation here, as long as it plays a bonding role.

[0038] In some embodiments, the protective glue is, for example, set to be opaque glue, and the visible light transmittance of the protective glue is, for example, less than or equal to 10%, and the specific visible light transmittance is, for example, 10%, 5%, 3%, 1% or 0%. In this way, the protective glue is opaque, which can prevent the incident light 281 from entering the interior of the protective glue, so that the incident light 281 is more directly or indirectly reflected onto the battery cell 210. In the case where the protective glue is set to be opaque glue, the reflective layer can be omitted, that is, the outer surface of the protective glue can be directly connected to the encapsulation film 240, which makes the structure of the protective member 230 relatively simpler and easier to produce and manufacture than the protective member 230 provided with a reflective layer.

[0039] In some embodiments, the protective glue is set to be a light-transmitting glue, and the visible light transmittance of the protective glue is greater than or equal to 50%, specifically for example 50%, 60%, 70%, 80%, 90%, 95%, etc. The outer surface of the protective glue is directly connected to the encapsulating film 240. In this way, when the outer surface of the protective glue is directly connected to the encapsulating film 240, after the sunlight penetrates the glass 250 and the encapsulating film 240, it will be incident on the outer surface of the protective glue. The outer surface of the protective glue can reflect the incident light 281 directly onto the battery cell 210 and / or reflect the light to the first interface 260, and then reflect it from the first interface 260 to the battery cell 210, thereby increasing the utilization rate of sunlight.

[0040] In addition, the refractive index of the protective glue and the outer surface shape of the protective glue can be flexibly adjusted according to actual needs, such as the flexible adjustment of the inclination angle relative to the surface of the battery cell 210, so that after the sunlight is incident on the outer surface of the protective glue, it can not only reflect the light directly to the surface of the battery cell 210, and / or reflect the light to the first interface 260 and then reflect it to the battery cell 210 from the first interface 260, but also the refracted light can be incident on the surface of the battery cell 210, thereby further improving the utilization rate of light.

[0041] In some embodiments, the protective glue includes but is not limited to silicone, polyvinyl butyral (PVB), polycarbonate (PC), sound insulation PVB, shading tape PVB, thermal control PVB, ethylene vinyl acetate (EVA), thermoplastic polyurethane (TPU), ionomers, thermoplastic materials, polybutylene terephthalate (PBT), polyethylene vinyl acetate (PET), polyethylene naphthalate (PEN), polyvinyl chloride (PVC), polyvinyl fluoride (PVF), polyacrylate (PA), polymethyl methacrylate (PMMA), polyurethane (PUR) and combinations thereof, which can be flexibly adjusted and selected according to actual needs and are not limited here.

[0042] In some embodiments, the protective member 230 completely wraps around the outer surface of the conductive wire 220. It should be noted that the outer surface of the conductive wire 220 in this embodiment refers to the portion of the outer wall of the conductive wire 220 that is not connected to the cell 210. In other words, the portion of the outer wall of the conductive wire 220 that is not connected to the cell 210. This ensures that the protective member 230 securely attaches the conductive wire 220 to the cell 210, effectively preventing the conductive wire 220 from falling off. Furthermore, the protective member 230 has a larger outer surface area, thereby improving light utilization.

[0043] Of course, in some optional solutions, the protective member 230 does not need to be completely wrapped around the conductive wire 220, but can be connected to any side of the conductive wire 220, in other words, half wrapped around the conductive wire 220, or can be connected to the conductive wire 220 in other forms, which are not limited here.

[0044] In some embodiments, the protective member 230 extends from one end of the conductive wire 220 to the other end of the conductive wire 220. In this way, all portions of the conductive wire 220 between the two opposite ends along its extension direction are protected by the protective member 230, which has a good protective effect and can effectively improve the utilization rate of light.

[0045] In some embodiments, the cross-sectional profile of the protective member 230 along the extension direction of the conductive line 220 includes, but is not limited to, regular shapes such as a triangle, a trapezoid, a semicircle, or a semi-ellipse, as well as other irregular shapes. Thus, the outer surface of the protective member 230 can be used to reflect sunlight directly onto the solar cell 210 and / or reflect sunlight onto the first interface 260 between the glass 250 and the air, and then reflect sunlight from the first interface 260 onto the solar cell 210.

[0046] See also Figure 4 and Figure 5 In one embodiment, the outer surface of the protective member 230 includes a first inclined surface 231 that is arranged at an angle to the surface of the battery cell 210. Specifically, the angle between the first inclined surface 231 and the battery cell 210 is γ, 21.25°≤γ<45°, and γ is specifically 21.25°, 22°, 25°, 30°, 35°, or 44°, for example. Figure 5 As shown, γ is relatively small, which can realize the reflection of sunlight to the first interface 260 between the glass 250 and the air and then reflected from the first interface 260 to the battery cell 210; or, 45°<γ<90°, γ is specifically 46°, 50°, 55°, 60°, 75° or 85°, etc. Figure 4 As shown, γ is relatively large, which can not only realize the direct reflection of sunlight to the cell 210 , but also realize the refracted light to be incident to the cell 210 .

[0047] In some embodiments, the outer surface of the protective member 230 further includes a second inclined surface 232 disposed at an angle to the surface of the battery cell 210. The second inclined surface 232 is connected to the first inclined surface 231. The shape enclosed by the first inclined surface 231, the second inclined surface 232, and the battery cell 210 forms a triangular cross-section along the extension direction of the conductive line 220. More specifically, the first inclined surface 231 and the second inclined surface 232 are symmetrically disposed, forming an isosceles triangle.

[0048] See also Figure 6In some embodiments, the outer surface of the protective member 230 may be configured as an arc-shaped surface or an elliptical surface. In this way, the cross-sectional profile of the protective member 230 along the extension direction of the conductive wire 220 is correspondingly semicircular or semi-elliptical.

[0049] In one embodiment, a photovoltaic module includes the solar cell of any of the above embodiments, and further includes an encapsulation film 240 and glass 250 . The glass 250 is connected to the cell 210 through the encapsulation film 240 , and the encapsulation film 240 is also connected to the protective member 230 .

[0050] In the above-mentioned photovoltaic module, on the one hand, the outer surface of the protective member 230 can be used to reflect sunlight directly onto the battery cell 210 and / or reflect sunlight to the first interface 260 between the glass 250 and the air and reflect it from the first interface 260 to the battery cell 210, which can avoid the loss of light caused by directly reflecting the incident light 281 back to the glass 250 as in the related art, thereby improving the secondary utilization rate of light and further improving the power output of the photovoltaic module; on the other hand, the protective member 230 not only plays a protective role, but also makes the conductive wire 220 more stably set on the battery cell 210 to prevent falling defects.

[0051] Taking the example of incident light 281 incident perpendicularly to the surface of the cell 210 and the cross-sectional profile of the protective member 230 along its extension direction being an ideal triangle, the refractive index of the encapsulating film 240 is assumed to be N1, the refractive index of the protective adhesive is assumed to be N2, the refractive index of the glass 250 is assumed to be N3, and the refractive index of the air is assumed to be N4. The interface between the glass 250 and the air is the first interface 260, and the interface between the glass 250 and the encapsulating film 240 is the second interface 270. The following methods are used to improve optical efficiency:

[0052] Method 1: The protective member 230 includes a reflective layer disposed on the outer surface of the protective adhesive. Most of the incident light 281 will be reflected by the reflective layer when incident on the outer surface of the protective member 230. Figure 4 As shown, when the angle γ between the first inclined surface 231 and the surface of the cell 210 satisfies 45°<γ<90°, the incident light 281 can be directly reflected to the surface of the cell 210, thereby being absorbed by the cell 210, so that the power output of the photovoltaic module can be improved; Figure 5As shown, when the angle γ between the first inclined surface 231 and the surface of the battery cell 210 satisfies 21.25≤γ<45°, after the incident light 281 is incident on the first inclined surface 231 at the incident angle α, an upward first reflected light 284 will be generated. The first reflected light 284 is set at an angle with the second interface 270 and the first interface 260 respectively, and forms a total reflection at the first interface 260 to generate a second reflected light 285. The second reflected light 285 is incident on the surface of the battery cell 210 and is absorbed by the battery cell 210, so that the power output of the photovoltaic module can be improved.

[0053] For ease of understanding, the optical principle that the first reflected light 284 can be totally reflected at the first interface 260 and generate the second reflected light 285 when the angle γ between the first inclined surface 231 and the surface of the cell 210 satisfies 21.25≤γ<45° will be described below.

[0054] It can be understood that the total reflection angle triggering condition is only related to the material where the first reflected light 284 is initially located and the final interface material. Therefore, the packaging film 240 is related to the refractive index of air.

[0055] Assuming that the incident angle of the first reflected light 284 at the interface between the encapsulation film 240 and the glass 250 is g, and the refraction angle at the first interface 260 between the glass 250 and the air is m, the relationship N4*Sin(m)=N1*Sin(g) is established, and the boundary condition for total internal reflection is:

[0056] m=90°, sin90°=1

[0057] Sin(g)=N4 / N1, g=arcSin(N4 / N1), the refractive index of air is 1, and the refractive index of the encapsulation film 240 is generally 1.47~1.48, so g≥42.5°, and γ=α=1 / 2g, therefore, 21.25≤γ<45°.

[0058] In summary, when the protective member 230 includes a reflective layer arranged on the outer surface of the protective glue, the protective member 230 includes a first inclined surface 231, and the angle γ between the first inclined surface 231 and the battery cell 210 satisfies 21.25≤γ<45°, or 45°<γ<90°, the optical utilization rate can be increased.

[0059] Also, see Figure 6 When the cross-sectional profile of the protective member 230 along its extension direction is semicircular, due to the existence of the angle γ between the tangent and the battery cell 210, it satisfies 21.25≤γ<45°, or 45°<γ<90°, that is, it can achieve direct or indirect reflection of light to the battery cell 210, thereby improving optical utilization.

[0060] Method 2: Please refer to Figure 4The protective member 230 includes a translucent protective glue, and no reflective layer is provided on the outer surface of the protective glue. The incident light 281 is incident on the first inclined surface 231 with an incident angle of α. When entering the interior of the protective glue, the incident light 281 is divided into three parts. The first part of the light 282 is reflected by the surface of the protective glue, the second part of the light 283 is refracted after being incident on the interior of the protective glue, and the third part of the light is absorbed by the colloid.

[0061] On the one hand, by adjusting the angle γ and the refractive index of the protective adhesive, the first portion of light 282 is totally reflected by the first inclined surface 231. Based on Sinα*N1=Sinβ*N2, β is the refractive angle of the second portion of light 283 incident from the encapsulation film 240 to the interior of the protective adhesive, when β=90°, total reflection occurs, then N2=Sinα*N1, and the angle α is 21.25≤γ<45°, or 45°<γ<90°, as in Method 1. When the incident light 281 is perpendicular to the battery surface, γ=α. The corresponding refractive index of the protective adhesive and the normal of the first inclined surface 231 have a matching relationship to achieve optical utilization. For example, when γ=75°, Sin75°≈0.966, N1 is selected as 1.48, and N2 is approximately 1.43. That is, γ=75° and N2=1.43 are simultaneously satisfied, which can achieve improved optical utilization.

[0062] On the other hand, when β is less than 90°, total reflection is not formed. Since β is greater than α, the second portion of light 283 is deflected to the surface of the battery cell 210 by refraction, and is thus absorbed and utilized by the surface of the battery cell 210 .

[0063] The best condition is that all optical refraction is deflected to the surface of the cell 210, such as Figure 4 As shown, the height of the conductive line 220 is b, the width is a, and the distance from the top of the protective glue to the conductive line 220 is c, then the relationship is:

[0064] α+arcTan(a / 2c)=β;

[0065] Sinα*N1=Sinβ*N2, N2=Sina*N1 / Sin[α+arcTan (a / 2c)]

[0066] It can be seen that N1, N2, α, β, a, b and c are matched. By flexibly adjusting and matching the sizes of various parameters, the conductive wire 220 will not block the second part of light 283, and the second part of light 283 will be completely incident on the surface of the battery cell 210, thereby improving the utilization rate of light.

[0067] In the description of this application, it should be understood that if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or position relationship indicated by these terms is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing this application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.

[0068] In addition, if the terms "first" or "second" appear, these terms are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of technical features indicated. Therefore, a feature specified as "first" or "second" may explicitly or implicitly include at least one of such features. In the description of this application, if the term "plurality" appears, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined.

[0069] In this application, unless otherwise specified or limited, the terms "mounted," "connected," "connected," "fixed," etc., should be interpreted broadly. For example, these terms may refer to fixed connections, removable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediary; and internal communication between two components or interaction between two components, unless otherwise specified. Those skilled in the art will understand the specific meanings of these terms in this application based on the specific circumstances.

[0070] In this application, unless otherwise expressly specified or limited, if a first feature is described as being "above" or "below" a second feature, or similar descriptions, this may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Furthermore, when a first feature is described as being "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is described as being "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0071] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element. If an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. If any, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are for illustrative purposes only and do not represent the only embodiment.

[0072] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0073] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that a person of ordinary skill in the art may make various modifications and improvements without departing from the spirit of the present application, and these modifications and improvements fall within the scope of protection of the present application. Therefore, the scope of protection of the present patent application shall be determined by the appended claims.

Claims

1. A solar cell, characterized in that: The solar cell comprises: Battery cell (210); a conductive line (220), the conductive line (220) being connected to the surface of the battery cell (210); and A protective member (230) is connected to the outer surface of the conductive wire (220), and the protective member (230) is also connected to the battery cell (210). The outer surface of the protective member (230) can be used to reflect sunlight directly onto the battery cell (210) and / or reflect sunlight onto a first interface (260) between the glass (250) and the air of the photovoltaic module and reflect the sunlight from the first interface (260) to the battery cell (210).

2. The solar cell according to claim 1, characterized in that The protective member (230) includes protective glue, the protective glue is connected to the outer surface of the conductive wire (220), and the protective glue is also connected to the battery cell (210).

3. The solar cell according to claim 2, characterized in that The protective member (230) further comprises a reflective layer, which is arranged on the outer surface of the protective glue; and / or the protective glue is configured as an opaque glue, and the visible light transmittance of the protective glue is less than or equal to 10%.

4. The solar cell according to claim 2, characterized in that The protective glue is set as a light-transmitting glue, the visible light transmittance of the protective glue is greater than or equal to 50%, and the outer surface of the protective glue is directly connected to the packaging glue film (240) of the photovoltaic module.

5. The solar cell according to claim 2, characterized in that The protective glue is a hot melt type, a heat curing type or a UV light curing type colloid.

6. The solar cell according to claim 1, wherein The protective member (230) is completely wrapped around the outer surface of the conductive wire (220); and / or the protective member (230) extends from one end of the conductive wire (220) to the other end of the conductive wire (220).

7. The solar cell according to claim 1, wherein The cross-sectional profile of the protective member (230) along the extension direction of the conductive wire (220) is triangular, trapezoidal, semicircular or semi-elliptical.

8. The solar cell according to claim 1, wherein The outer surface of the protective member (230) comprises a first inclined surface (231) arranged at an angle to the surface of the battery cell (210); the angle between the first inclined surface (231) and the battery cell (210) is γ, 21.25°≤γ<45°, or 45°<γ<90°.

9. The solar cell according to any one of claims 1 to 8, characterized in that The conductive wire (220) is at least one of a grid wire, a welding strip, and a bus bar; and / or the cross-sectional profile of the conductive wire (220) along its extension direction is rectangular; and / or the conductive wire (220) is plated on the surface of the battery cell (210).

10. A photovoltaic module, characterized in that: The photovoltaic module comprises the solar cell according to any one of claims 1 to 9, and further comprises an encapsulating film (240) and glass (250), wherein the glass (250) is connected to the cell (210) via the encapsulating film (240), and the encapsulating film (240) is also connected to the protective member (230).

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