Packaging adhesive film and photovoltaic module

Abstract

The utility model discloses a packaging adhesive film and a photovoltaic module, the packaging adhesive film comprises a first adhesive film layer and a third adhesive film layer which are oppositely arranged, and a second adhesive film layer is arranged between the first adhesive film layer and the third adhesive film layer; the first adhesive film layer is provided with a first groove, and the first groove is located in the side, away from the second adhesive film layer, of the first adhesive film layer; the first groove is formed in the surface of the first adhesive film layer, so that the gram weight of the packaging adhesive film can be effectively reduced, and the cost of the packaging adhesive film is reduced; before follow-up lamination, the packaging adhesive film needs to be laid on the battery piece, the first groove is located in the surface of the side, close to the battery piece, of the packaging adhesive film and makes contact with the battery piece, mechanical anti-sliding can be achieved before lamination, overall flowing, caused by extrusion, of the packaging adhesive film can be reduced in lamination, and local flowing of the packaging adhesive film is achieved; and the first groove can be tightly attached to a welding strip on the battery piece, so that the overall sealing performance of the photovoltaic module is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of photovoltaics, and more specifically, to a packaging adhesive film and a photovoltaic component. Background Art

[0002] Photovoltaic modules are an important part of solar photovoltaic systems. They are usually called solar panels or solar photovoltaic panels. They are used to convert sunlight into usable electrical energy. Photovoltaic modules are composed of many solar cells, which are usually made of silicon materials. When sunlight shines on photovoltaic modules, the light energy is absorbed and excites the electrons in the cells, thereby generating direct current, which can be used to power various devices.

[0003] Conventional packaging films have a relatively large gram weight, which easily leads to high packaging film costs, and the packaging film is prone to the risk of overall slippage when being installed and fixed. Utility Model Content

[0004] In view of this, the utility model provides a packaging film and a photovoltaic module, which reduce the weight of the packaging film and avoid the risk of overall slippage of the packaging film when it is installed and fixed.

[0005] In the first aspect, the present application provides a packaging film, including a first film layer and a third film layer arranged relatively to each other, and a second film layer is also arranged between the first film layer and the third film layer; the first film layer is provided with at least one first groove, the first groove is located on the side of the first film layer away from the second film layer, and the first groove extends along a first direction, and the first direction is the length direction of the packaging film.

[0006] Optionally, a cross section of the first groove along the second direction is an arc shape that is concave toward a side close to the second adhesive film layer; and the second direction intersects with the first direction.

[0007] Optionally, at least one second groove is provided on a side of the first adhesive film layer away from the second adhesive film layer, the second groove extends along a second direction, the second direction intersects with the first direction, and the first groove is connected to the second groove.

[0008] Optionally, a cross section of the second groove along the first direction is an arc shape that is concave toward a side close to the second adhesive film layer.

[0009] Optionally, a tic-tac-toe pattern is provided on a side of the third adhesive film layer away from the first adhesive film layer, and the tic-tac-toe pattern is convex toward the side away from the first adhesive film layer.

[0010] Optionally, the first adhesive film layer and the second adhesive film layer are made of different materials, and the first adhesive film layer and the third adhesive film layer are made of the same material.

[0011] Optionally, the materials of the first adhesive film layer and the third adhesive film layer include polyethylene octene co-elastomer; and the material of the second adhesive film layer includes ethylene-vinyl acetate copolymer.

[0012] In a second aspect, the present application provides a photovoltaic module, comprising a first packaging film, a battery string, and a second packaging film that are stacked; the battery string comprises at least two battery cells; two adjacent battery cells are connected by a welding ribbon;

[0013] The first encapsulation film and / or the second encapsulation film comprises a first film layer and a third film layer which are arranged opposite to each other, and a second film layer is further arranged between the first film layer and the third film layer; the first film layer is located on a side of the second film layer close to the battery cell; the first film layer of the first encapsulation film and / or the second encapsulation film is provided with at least one first groove, the first groove is located on a side of the first film layer away from the second film layer, the first groove extends along a first direction, the first direction is the length direction of the first encapsulation film and / or the second encapsulation film, and the orthographic projection of at least one welding strip on the plane where the second film layer is located is located within the range of the orthographic projection of the first groove on the plane where the second film layer is located.

[0014] Optionally, a front plate is provided on a side of the first packaging film away from the battery cell, and a back plate is provided on a side of the second packaging film away from the battery cell.

[0015] Optionally, the peripheries of the front plate, the first packaging film, the battery cell, the second packaging film and the back plate are covered with a frame;

[0016] The frame includes a first limiting portion, a second limiting portion, a top bearing portion, a side portion, a bottom bearing portion and an extension portion which are connected in sequence; a receiving groove is arranged between the first limiting portion, the second limiting portion and the top bearing portion; the first limiting portion is arranged opposite to the top bearing portion; a molding cavity is arranged between the side portion, the bottom bearing portion and the extension portion.

[0017] Compared with the prior art, the encapsulation film and photovoltaic module provided by the utility model achieve at least the following beneficial effects:

[0018] The utility model provides an encapsulation film and a photovoltaic module, wherein the encapsulation film comprises a first film layer and a third film layer which are arranged relatively to each other, and a second film layer is further arranged between the first film layer and the third film layer; the first film layer is provided with a first groove, and the first groove is located on a side of the first film layer away from the second film layer; the first groove is provided on the surface of the first film layer, which can effectively reduce the gram weight of the encapsulation film, thereby reducing the cost of the encapsulation film; before subsequent lamination, the encapsulation film needs to be laid on the battery cell, and the first groove is located on the surface of the encapsulation film on the side close to the battery cell, and contacts with the battery cell, which can achieve mechanical anti-slip before lamination, and can also reduce the overall flow of the encapsulation film caused by extrusion during lamination, and achieve local flow of the encapsulation film; the first groove can also fit tightly with the welding strip on the battery cell, thereby improving the overall sealing performance of the photovoltaic module.

[0019] Of course, any product implementing the present utility model does not necessarily need to achieve all of the above-mentioned technical effects at the same time.

[0020] Other features and advantages of the present invention will become apparent from the following detailed description of exemplary embodiments of the present invention with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the present invention and, together with the description, serve to explain the principles of the present invention.

[0022] Figure 1 It is a schematic diagram of the structure of the encapsulation film provided by an embodiment of the utility model;

[0023] Figure 2 is a structural schematic diagram of the packaging film provided by an embodiment of the utility model from another perspective;

[0024] Figure 3 This is a schematic diagram of the structure of a photovoltaic module provided by an embodiment of the utility model;

[0025] Figure 4 It is a structural schematic diagram of a battery string provided by an embodiment of the utility model;

[0026] Figure 5 yes Figure 3 A cross-sectional view at A-A';

[0027] Figure 6 yes Figure 3 Another cross-sectional view at A-A';

[0028] Figure 7 yes Figure 3 A cross-sectional view at B-B';

[0029] Figure 8 It is a schematic structural diagram of another photovoltaic assembly provided by an embodiment of the utility model. DETAILED DESCRIPTION

[0030] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that unless otherwise specifically stated, the relative arrangements of components and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present invention.

[0031] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the present invention, its application, or uses.

[0032] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered as part of the specification.

[0033] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not limiting. Therefore, other examples of the exemplary embodiments may have different values.

[0034] It should be noted that like reference numerals and letters refer to similar items in the following figures, and therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0035] See also Figure 1 and Figure 2 As shown, Figure 1 is a schematic diagram of the structure of the encapsulation film provided by the embodiment of the utility model, Figure 2 is a schematic diagram of the structure of the encapsulation film provided by the embodiment of the utility model from another perspective; it should be noted that Figure 1 and Figure 2 The film structure of the packaging film 100 is only schematically illustrated. In some other embodiments of the present application, the packaging film 100 may be embodied as a circle, an ellipse, or other special-shaped structures in addition to a rectangle. The present application does not specifically limit the shape of the packaging film 100. In addition, in order to clearly illustrate the film structure of the packaging film 100, Figure 1 and Figure 2 The diagram only illustrates the relative position of each film layer and does not represent the actual size, thickness and shape.

[0036] The present embodiment provides a packaging film 100, including a first film layer 101 and a third film layer 103 arranged opposite to each other, and a second film layer 102 is further arranged between the first film layer 101 and the third film layer 103; the first film layer 101 is provided with at least one first groove 1011, the first groove 1011 is located on a side of the first film layer 101 away from the second film layer 102, and the first groove 1011 extends along a first direction X, and the first direction X is the length direction of the packaging film 100.

[0037] For details, see Figure 1 and Figure 2 As shown, the present embodiment provides a packaging film 100, which is used to package and protect the battery cell, prevent the external environment from affecting the performance of the battery cell, and bond the front plate, the battery cell and the back plate together. It has a certain bonding strength, high light transmittance, reasonable cross-linking degree, excellent UV aging resistance and excellent moisture and heat aging resistance, extremely low shrinkage, long-term strong bonding performance to various back plates and front plates, and high volume resistivity. The thickness range of the packaging film 100 can be 0.3-0.5mm; the packaging film 100 includes a first film layer 101 and a third film layer 103 that are relatively arranged, and a second film layer 102 is further provided between the first film layer 101 and the third film layer 103; the packaging film 100 can be composed of the first film layer 101 and the third film layer 103. A laminated structure is formed by melt co-extrusion of a first film layer 101, a second film layer 102 and a third film layer 103. The shapes of the first film layer 101, the second film layer 102 and the third film layer 103 can be rectangular, circular, elliptical, or other special-shaped structures. The shapes of the first film layer 101, the second film layer 102 and the third film layer 103 are not specifically limited in this embodiment; the first film layer 101 is provided with at least one first groove 1011, and the number of the first grooves 1011 can be one, four, eight or ten, which is not specifically limited in this embodiment; at the same time, the cross-sectional shape of the first groove 1011 along the thickness direction of the packaging film 100 can be semicircular, rectangular, trapezoidal or other irregular shapes, which is not specifically limited in this embodiment.

[0038] The first groove 1011 is located on a side of the first film layer 101 away from the second film layer 102, and the first groove 1011 extends along a first direction X, which is the length direction of the packaging film 100; it can be understood that the first direction X is the length direction of the packaging film 100, that is, the extension direction of the welding strip; the extension direction of the first groove 1011 is the same as the extension direction of the welding strip; when the subsequent packaging film 100 is laid on the battery cell, the first film layer 101 is located on a side of the second film layer 102 close to the battery cell, and because the first groove 1011 is located on a side of the first film layer 101 away from the second film layer 102, that is, the subsequent first groove 1011 can contact the battery cell, and in the thickness direction of the packaging film 100, each first groove 1011 can cover at least one welding strip. Of course, according to actual needs, the number of welding strips covered by each first groove 1011 can also be two, three or four, and this embodiment does not specifically limit this.

[0039] The packaging film 100 provided in this embodiment has a first groove 1011 on the surface of the first film layer 101, which can effectively reduce the gram weight of the packaging film 100, thereby reducing the cost of the packaging film 100; before subsequent lamination, the packaging film 100 needs to be laid on the battery cell, and the first groove 1011 is located on the surface of the packaging film 100 close to the battery cell and contacts the battery cell, which can achieve mechanical anti-slip before lamination and can also reduce the overall flow of the packaging film 100 caused by extrusion during lamination, thereby achieving local flow of the packaging film 100; the first groove 1011 can also fit tightly with the welding strip on the battery cell, thereby improving the overall sealing performance of the photovoltaic module.

[0040] It can be seen from the above embodiments that the encapsulation film provided in this embodiment achieves at least the following beneficial effects:

[0041] The present embodiment provides a packaging film 100, comprising a first film layer 101 and a third film layer 103 arranged opposite to each other, and a second film layer 102 is further arranged between the first film layer 101 and the third film layer 103; the first film layer 101 is provided with a first groove 1011, and the first groove 1011 is located on a side of the first film layer 101 away from the second film layer 102; the first groove 1011 is provided on the surface of the first film layer 101, which can effectively reduce the gram weight of the packaging film 100, thereby reducing the cost of the packaging film 100; before subsequent lamination, the packaging film 100 needs to be laid on the battery cell, and the first groove 1011 is located on the surface of the packaging film 100 on the side close to the battery cell, and contacts with the battery cell, which can achieve mechanical anti-slip before lamination, and can also reduce the overall flow of the packaging film 100 caused by extrusion during lamination, and achieve local flow of the packaging film 100; the first groove 1011 can also fit tightly with the welding strip on the battery cell, thereby improving the overall sealing performance of the photovoltaic module.

[0042] In some optional embodiments, see Figure 1 and Figure 2 As shown, the cross section of the first groove 1011 along the second direction Y is an arc shape that is concave toward the side close to the second adhesive film layer 102 ; the second direction Y intersects the first direction X.

[0043] For details, see Figure 1 and Figure 2 As shown, in this embodiment, the cross section of the first groove 1011 along the second direction Y is an arc-shaped concave toward the side close to the second film layer 102; the second direction Y intersects with the first direction X; it can be understood that the first direction X and the second direction Y can be perpendicular to each other, and the first direction X and the second direction Y are parallel to the extension direction of the packaging film 100; the first film layer 101 is provided with a first groove 1011 on the side away from the second film layer 102, and the first groove 1011 can extend along the first direction X and be arranged along the second direction Y; the cross section of the first groove 1011 along the second direction Y is an arc-shaped concave toward the side close to the second film layer 102, which can increase the internal space of the first groove 1011 volume and the surface area of ​​the first groove 1011; when the subsequent packaging film 100 is laid on the battery cell, the number of welding strips accommodated in the first groove 1011 can be increased in the thickness direction of the packaging film 100; and the cross-sectional shape of the welding strip is generally circular, which can match the arc-shaped cross-section of the first groove 1011, thereby increasing the contact area between the first groove 1011 and the welding strip, thereby improving the mechanical anti-slip performance before lamination, and can also reduce the overall flow of the packaging film 100 caused by extrusion during lamination, thereby achieving local flow of the packaging film 100; the arc-shaped first groove 1011 can fit tightly with the welding strip, thereby improving the overall sealing performance of the photovoltaic module.

[0044] In some optional embodiments, see Figure 1 and Figure 2 As shown, at least one second groove 1012 is provided on one side of the first adhesive film layer 101 away from the second adhesive film layer 102 . The second groove 1012 extends along a second direction Y. The second direction Y intersects with the first direction X. The first groove 1011 is connected to the second groove 1012 .

[0045] For details, see Figure 1 and Figure 2As shown, in this embodiment, at least one second groove 1012 is provided on one side of the first adhesive film layer 101 away from the second adhesive film layer 102. The number of the second grooves 1012 can be one, four, eight or ten, which is not specifically limited in this embodiment; at the same time, the cross-sectional shape of the second groove 1012 along the thickness direction of the packaging adhesive film 100 can be a semicircular, rectangular, trapezoidal or other irregular shapes, which is not specifically limited in this embodiment; the second groove 1012 extends along the second direction Y, and the second direction Y intersects with the first direction X; further The first direction X and the second direction Y can be perpendicular to each other, and the first direction X and the second direction Y are parallel to the extension direction of the packaging film 100; the second groove 1012 can extend along the second direction Y and be arranged along the first direction X; the first groove 1011 is connected to the second groove 1012; when the subsequent packaging film 100 is laid on the battery cell, the first direction X is the extension direction of the main grid line and the welding strip, and the second direction Y is the extension direction of the fine grid line; the first film layer 101 is located on the side of the second film layer 102 close to the battery cell, The second groove 1012 is located on the side of the first film layer 101 away from the second film layer 102, that is, the second groove 1012 can be in contact with the battery cell; in the thickness direction of the packaging film 100, each second groove 1012 can cover at least one fine grid line, of course, according to actual needs, the number of fine grid lines covered by each second groove 1012 can also be two, three or four, and this embodiment does not specifically limit this; the second groove 1012 is opened on the surface of the first film layer 101, which can effectively reduce the packaging film 100 grams of weight, thereby reducing the cost of the packaging film 100; before subsequent lamination, the packaging film 100 needs to be laid on the battery cell, and the second groove 1012 is located on the surface of the packaging film 100 close to the battery cell and in contact with the battery cell, which can achieve mechanical anti-slip before lamination and can also reduce the overall flow of the packaging film 100 due to extrusion during lamination, thereby achieving local flow of the packaging film 100; the second groove 1012 can also fit tightly with the fine grid lines on the battery cell, thereby improving the overall sealing performance of the photovoltaic module.

[0046] In some optional embodiments, see Figure 2 As shown, the cross section of the second groove 1012 along the first direction X is an arc shape that is concave toward the side close to the second adhesive film layer 102 .

[0047] For details, see Figure 2As shown, in this embodiment, the cross-section of the second groove 1012 along the first direction X is an arc that is concave toward the side close to the second film layer 102, which can increase the internal volume of the second groove 1012 and the surface area of ​​the second groove 1012; when the subsequent packaging film 100 is laid on the battery cell, the number of fine grid lines accommodated in the second groove 1012 can be increased in the thickness direction of the packaging film 100, and the contact area between the second groove 1012 and the fine grid lines is increased, thereby improving the mechanical anti-slip performance of the packaging film 100 before lamination, and can also reduce the overall flow of the packaging film 100 due to extrusion during lamination, thereby achieving local flow of the packaging film 100; the arc-shaped second groove 1012 can fit tightly with the fine grid lines, thereby improving the overall sealing performance of the photovoltaic module.

[0048] In some optional embodiments, see Figure 2 As shown, a tic-tac-toe pattern 1031 is provided on a side of the third adhesive film layer 103 away from the first adhesive film layer 101 , and the tic-tac-toe pattern 1031 is convex toward the side away from the first adhesive film layer 101 .

[0049] For details, see Figure 2 As shown, in this embodiment, a tic-tac-toe pattern 1031 is provided on a side of the third film layer 103 away from the first film layer 101, and the tic-tac-toe pattern 1031 protrudes toward the side away from the first film layer 101. It can be understood that when the front plate and the back plate are subsequently laid on the surface of the packaging film 100, the side of the third film layer 103 away from the first film layer 101 is provided with a tic-tac-toe pattern 1031, which is equivalent to that the tic-tac-toe pattern 1031 is located on the surface of the packaging film 100 on one side close to the front plate / back plate. Compared with the traditional planar packaging film 100, the tic-tac-toe pattern 1031 increases the roughness of the surface of the packaging film 100, which can improve the friction between the packaging film 100 and the front plate and the back plate, and avoid the packaging film 100 from slipping, thereby ensuring the packaging effect of the photovoltaic module.

[0050] In some optional embodiments, see Figure 1 As shown, the materials of the first adhesive film layer 101 and the second adhesive film layer 102 are different, and the materials of the first adhesive film layer 101 and the third adhesive film layer 103 are the same.

[0051] For details, see Figure 1As shown, in this embodiment, the materials of the first film layer 101 and the second film layer 102 are different, and the materials of the first film layer 101 and the third film layer 103 are the same; it can be understood that the materials of the first film layer 101 and the third film layer 103 can be one or a combination of ethylene-vinyl acetate copolymer, polyethylene octene co-elastomer and polyvinyl butyral, and the material of the second packaging film 102 can also be one or a combination of ethylene-vinyl acetate copolymer, polyethylene octene co-elastomer and polyvinyl butyral, as long as the materials of the first film layer 101 and the third film layer 103 are different from those of the second film layer 102, this embodiment does not make specific restrictions on this; wherein, ethylene-vinyl acetate copolymer is EVA, which has the advantages of excellent bonding performance, low melting temperature, good melt fluidity and softness, low cost, easy construction, etc., and the ethylene-vinyl acetate copolymer material introduces vinyl acetate monomer into the molecular chain. , thereby reducing high crystallinity, improving toughness, impact resistance, filler compatibility and heat sealing performance; polyethylene octene co-elastomer is POE, and the molecular structure of polyethylene octene co-elastomer material makes it have excellent mechanical properties, rheological properties and UV resistance, and also has good affinity with polyolefins, good low-temperature toughness, high performance-price ratio and the like; polyvinyl butyral is PVB, and polyvinyl butyral material is soluble in methanol, ethanol, ketones, halogenated alkanes, and aromatic hydrocarbon solvents, and has good compatibility with phthalates, sebacate benzene plasticizers, as well as nitrocellulose, phenolic resin, epoxy resin, etc., and has high transparency, cold resistance, impact resistance, UV resistance, and good adhesion to metals, glass, wood, ceramics, fiber products, etc.; the first film layer 101, the second film layer 102 and the third film layer 103 can be formed by resin co-extrusion blown film, so that the encapsulation film 100 has good processing performance and good anti-PID performance and water vapor resistance at the same time.

[0052] In some optional embodiments, see Figure 1 As shown, the materials of the first adhesive film layer 101 and the third adhesive film layer 103 include polyethylene octene co-elastomer; the material of the second adhesive film layer 102 includes ethylene-vinyl acetate copolymer.

[0053] For details, see Figure 1As shown, the materials of the first film layer 101 and the third film layer 103 in this embodiment include polyethylene octene co-elastomer; the material of the second film layer 102 includes ethylene-vinyl acetate copolymer; it can be understood that the packaging film 100 in this embodiment can be an EPE film, which can be made of two materials, polyethylene octene co-elastomer and ethylene-vinyl acetate copolymer, by a co-extrusion method; the adhesion of ethylene-vinyl acetate copolymer film is not as good as that of polyethylene octene co-elastomer film, but its PID value is high, which can effectively improve the power generation efficiency of photovoltaic modules; EPE film takes into account the advantages of both polyethylene octene co-elastomer film and ethylene-vinyl acetate copolymer film. Compared with single-layer polyethylene octene co-elastomer film and ethylene-vinyl acetate copolymer film, EPE film has good adhesion, and the material cost is lower than that of ethylene-vinyl acetate copolymer film, which not only achieves performance but also saves cost.

[0054] See also Figure 3 and Figure 4 As shown, Figure 3 is a schematic diagram of the structure of a photovoltaic module provided by an embodiment of the utility model, Figure 4 : is a schematic diagram of a battery string provided by an embodiment of the utility model; this embodiment also provides a photovoltaic module 200, including a first packaging film 201, a battery string 202 and a second packaging film 203 arranged in a stacked manner; the battery string 202 includes at least two battery cells 2021; two adjacent battery cells 2021 are connected by a welding strip 2022;

[0055] See also Figure 5 and Figure 6 As shown, Figure 5 yes Figure 3 A cross-sectional view at A-A', Figure 6 yes Figure 3 Another cross-sectional view at A-A' in the figure, the first encapsulation film 201 and / or the second encapsulation film 203 include a first film layer 101 and a third film layer 103 arranged opposite to each other, and a second film layer 102 is further arranged between the first film layer 101 and the third film layer 103; the first film layer 101 is located on a side of the second film layer 102 close to the battery cell 2021; the first film layer 101 of the first encapsulation film 201 and / or the second encapsulation film 203 is provided with at least one first groove 1011, the first groove 1011 is located on a side of the first film layer 101 away from the second film layer 102, the first groove 1011 extends along a first direction X, the first direction X is the length direction of the first encapsulation film 201 and / or the second encapsulation film 203, and the orthographic projection of at least one welding strip 2022 on the plane where the second film layer 102 is located is located within the range of the orthographic projection of the first groove 1011 on the plane where the second film layer 102 is located.

[0056] For details, see Figure 3 and Figure 4 As shown, the present embodiment further provides a photovoltaic module 200, comprising a first packaging film 201, a battery string 202, and a second packaging film 203 arranged in a stacked manner; the battery string 202 comprises at least two battery cells 2021; two adjacent battery cells 2021 are connected by a welding strip 2022; the function of the welding strip 2022 is to collect the charge on a single battery cell 2021 and connect the battery cells 2021 to each other to form a battery string 202, and the present embodiment does not limit the distance between adjacent battery cells 2021 in the battery string 202, as long as the purpose of the present embodiment can be achieved; the welding strip 2022 can be selected according to its current carrying capacity and mechanical strength, and the welding strip 2022 can be a tin-coated alloy The gold-copper strip is made by shearing, drawing or rolling of oxygen-free copper, and all outer surfaces are hot-dip coated. The purity of the core copper substrate is ≥99.97%, Sn≈63% and Pb≈37% in the lead-containing coating, and Sn≈96.5%, Ag≈3% and Cu≈0.5% in the lead-free coating; the tin-coated copper strip of the welding strip 2022 has high welding operability and firmness, and at the same time, the welding strip 2022 has low resistivity, safe current-carrying cross-sectional area, good mechanical properties, good anti-aging performance, and compatibility with silicon wafers; the cross-sectional shape of the welding strip 2022 can be a rectangular welding strip, a round wire welding strip or a triangular welding strip; the front and / or back of the battery cell 2021 can be provided with a welding strip 2022.

[0057] Continue to see Figure 5 and Figure 6As shown, the first encapsulation film 201 and / or the second encapsulation film 203 include a first film layer 101 and a third film layer 103 that are arranged opposite to each other, and a second film layer 102 is further provided between the first film layer 101 and the third film layer 103. That is to say, in the photovoltaic module of this embodiment, only the first encapsulation film 201 may adopt the encapsulation film 100 in the above-mentioned embodiment, or only the second encapsulation film 203 may adopt the encapsulation film 100 in the above-mentioned embodiment, or both the first encapsulation film 201 and the second encapsulation film 203 may adopt the encapsulation film 100 in the above-mentioned embodiment; the shapes of the first film layer 101, the second film layer 102 and the third film layer 103 may be rectangular, circular, elliptical, or other special-shaped structures, and this embodiment does not specifically limit the shapes of the first film layer 101, the second film layer 102 and the third film layer 103; the first film layer 101 is located between the second film layer 102 and the third film layer 103; one side close to the battery cell 2021; the first film layer 101 of the first packaging film 201 and / or the second packaging film 203 is provided with at least one first groove 1011, that is, in this embodiment, only the first film layer 101 of the first packaging film 201 can be provided with the first groove 1011, or only the first film layer 101 of the second packaging film 203 can be provided with the first groove 1011, or both the first film layer 101 of the first packaging film 201 and the second packaging film 203 can be provided with the first groove 1011, and this is not specifically limited in this embodiment; the number of the first grooves 1011 can be one, four, eight or ten, and this is not specifically limited in this embodiment; at the same time, the cross-sectional shape of the first groove 1011 along the thickness direction of the first packaging film 201 and / or the second packaging film 203 can be semicircular, rectangular, trapezoidal or other irregular shapes, and this is not specifically limited in this embodiment.

[0058] The first groove 1011 is located on a side of the first film layer 101 away from the second film layer 102, and the first groove 1011 extends along the first direction X, the first direction X is the length direction of the first packaging film 201 and / or the second packaging film 203, and the orthographic projection of at least one welding strip 2022 on the plane where the second film layer 102 is located is located within the range of the orthographic projection of the first groove 1011 on the plane where the second film layer 102 is located; it can be understood that the first direction X is the length direction of the first packaging film 201 and / or the second packaging film 203, that is, the extension direction of the welding strip 2022; the extension direction of the first groove 1011 is the same as the extension direction of the welding strip 2022; when the first packaging film 2 01 and / or the second packaging film 203 are laid on the battery string 202, the first film layer 101 is located on the side of the second film layer 102 close to the battery cell 2021, and because the first groove 1011 is located on the side of the first film layer 101 away from the second film layer 102, that is, the first groove 1011 can be in contact with the battery cell 2021, and in the thickness direction of the first packaging film 201 and / or the second packaging film 203, each first groove 1011 can cover at least one welding strip 2022. Of course, according to actual needs, the number of welding strips 2022 covered by each first groove 1011 can also be two, three or four, and this embodiment does not make specific limitations on this.

[0059] The first packaging film 201 and / or the second packaging film 203 provided in this embodiment have a first groove 1011 on the surface of the first film layer 101, which can effectively reduce the gram weight of the first packaging film 201 and / or the second packaging film 203, thereby reducing the cost of the first packaging film 201 and / or the second packaging film 203; before lamination, the first packaging film 201 and / or the second packaging film 203 need to be laid on the battery cell 2021, and the first groove 1011 is located between the first packaging film 201 and the second packaging film 203. / or the second packaging film 203 is on the surface of the side close to the battery cell 2021 and is in contact with the battery cell 2021, which can achieve mechanical anti-slip before lamination, and can also reduce the overall flow of the first packaging film 201 and / or the second packaging film 203 due to extrusion during lamination, and achieve local flow of the first packaging film 201 and / or the second packaging film 203; the first groove 1011 can also fit tightly with the welding strip 2022 on the battery cell 2021, thereby improving the overall sealing performance of the photovoltaic module.

[0060] Optional, see Figure 7 As shown, Figure 7 yes Figure 3A cross-sectional view at the point B-B' in the figure, in this embodiment, at least one second groove 1012 may be provided on one side of the first adhesive film layer 101 away from the second adhesive film layer 102, and the number of the second grooves 1012 may be one, four, eight or ten, which is not specifically limited in this embodiment; at the same time, the cross-sectional shape of the second groove 1012 along the thickness direction of the first packaging adhesive film 201 and / or the second packaging adhesive film 203 may be a semicircular, rectangular, trapezoidal or other irregular shapes, which is not specifically limited in this embodiment; the second groove 1012 extends along the second direction Y, and the second direction Y intersects with the first direction X; more specifically, the first direction X and the second direction X intersect with each other. The first direction X and the second direction Y may be perpendicular to each other, and the first direction X and the second direction Y are parallel to the extension direction of the first packaging film 201 and / or the second packaging film 203; the second groove 1012 may extend along the second direction Y and be arranged along the first direction X; the first groove 1011 is connected to the second groove 1012; the battery cell 2021 also includes a semiconductor substrate 20211, a fine grid line 20212 located on the semiconductor substrate 20211, and a main grid line located on the semiconductor substrate 20211. In this embodiment, the main grid line may be printed only on the front side of the battery cell 2021, or the main grid line may be printed only on the back side of the battery cell 2021, or the main grid line may be printed only on the back side of the battery cell 2021. The grid lines can also be printed on the front and back of the battery cell 2021; when the front and back of the battery cell 2021 are printed with main grid lines, the main grid lines of two adjacent battery cells 2021 are connected by the welding strip 2022, the first direction X is the extension direction of the main grid line and the welding strip 2022, and the second direction Y is the extension direction of the fine grid line 20212; when the first packaging film 201 and / or the second packaging film 203 are laid on the battery string 202, the first film layer 101 is located on the side of the second film layer 102 close to the battery cell 2021, and the second groove 1012 is located on the side of the first film layer 101 away from the second film layer 102, that is, the first The second grooves 1012 may be in contact with the battery cell 2021; in the thickness direction of the first packaging film 201 and / or the second packaging film 203, each second groove 1012 may cover at least one fine grid line 20212. Of course, according to actual needs, the number of fine grid lines 20212 covered by each second groove 1012 may also be two, three or four, which is not specifically limited in this embodiment; the second grooves 1012 are provided on the surface of the first film layer 101, which can effectively reduce the gram weight of the first packaging film 201 and / or the second packaging film 203, thereby reducing the cost of the first packaging film 201 and / or the second packaging film 203;Before lamination, the first encapsulation film 201 and / or the second encapsulation film 203 need to be laid on the battery cell 2021. The second groove 1012 is located on the surface of the first encapsulation film 201 and / or the second encapsulation film 203 on the side close to the battery cell 2021 and in contact with the battery cell 2021, which can achieve mechanical anti-slip before lamination, and can also reduce the overall flow of the first encapsulation film 201 and / or the second encapsulation film 203 due to extrusion during lamination, and achieve local flow of the first encapsulation film 201 and / or the second encapsulation film 203; the second groove 1012 can also fit closely with the fine grid line 20212 on the battery cell 2021, thereby improving the overall sealing performance of the photovoltaic module. ;

[0061] It can be seen from the above embodiments that the photovoltaic module provided in this embodiment achieves at least the following beneficial effects:

[0062] The photovoltaic module 200 provided in this embodiment includes a first packaging film 201, a battery string 202, and a second packaging film 203 which are stacked; the battery string 202 includes at least two battery cells 2021; two adjacent battery cells 2021 are connected by a welding strip 2022; wherein the first packaging film 201 and / or the second packaging film 203 are provided with a first groove 1011 on the surface of the first film layer 101, which can effectively reduce the gram weight of the first packaging film 201 and / or the second packaging film 203, thereby reducing the cost of the first packaging film 201 and / or the second packaging film 203; before lamination, the first packaging film 201 needs to be The first and / or second packaging films 201 and 203 are laid on the battery cell 2021, and the first groove 1011 is located on the surface of the first and / or second packaging films 201 and 203 on the side close to the battery cell 2021, and is in contact with the battery cell 2021, so as to achieve mechanical anti-slip before lamination, and can also reduce the overall flow of the first and / or second packaging films 201 and 203 due to extrusion during lamination, thereby achieving local flow of the first and / or second packaging films 201 and 203; the first groove 1011 can also fit tightly with the welding strip 2022 on the battery cell 2021, thereby improving the overall sealing performance of the photovoltaic module.

[0063] In some optional embodiments, see Figure 5 As shown, a front plate 204 is provided on a side of the first packaging film 201 away from the battery cell 2021 , and a back plate 205 is provided on a side of the second packaging film 203 away from the battery cell 2021 .

[0064] For details, see Figure 5As shown, a front plate 204 is provided on a side of the first packaging film 201 of the present embodiment away from the battery cell 2021, and a back plate 205 is provided on a side of the second packaging film 203 away from the battery cell 2021; wherein, the front plate 204 can be made of glass material, has a high light transmittance, and its light transmittance can reach more than 92%. Generally, low-iron tempered embossed glass is used, and the thickness range can be 2.7-3.2mm. The thickness of the front plate 204 can be 2.7mm, 3mm, 3.1mm or 3.2mm. The thickness of the front plate 204 can be set according to actual conditions, and this embodiment does not specifically limit this; within the wavelength range of 380 to 1100nm of the spectral response of the solar cell, the light transmittance can reach more than 91%, and it has a higher reflectivity for infrared light greater than 1200nm; the front plate 204 can be a conventional flat glass, and the shape of the front plate 204 is no longer limited in this embodiment, and can be square, round or other shapes, as long as it can be achieved The purpose of this embodiment is sufficient; of course, the front panel 204 can also be a special-shaped glass, such as curved glass. This embodiment no longer limits the curvature angle corresponding to the curved glass, and can be set according to actual conditions, which can be 5 degrees, 10 degrees, 15 degrees, 20 degrees, or other degrees. It can be understood that the back panel 205 can be consistent with the front panel 204, of course, it can also be different; the back panel 205 can be made of glass, TPT (polyvinyl fluoride composite film) or TPE (thermoplastic elastomer). The back panel 205 is used to protect the internal packaging materials and batteries from mechanical damage and external environmental erosion. It also has good insulation properties, which largely determines the working life of the component, has excellent weather resistance, low water vapor permeability, good electrical insulation, and a certain bonding strength; the thickness range of the back panel 205 can be 0.2-3.2mm, and the thickness of the back panel 205 can be 0.2mm, 1mm, 2mm, 3mm or 3.2mm.

[0065] In some optional embodiments, see Figure 8 As shown, Figure 8 It is a schematic diagram of the structure of another photovoltaic module provided by an embodiment of the utility model; the periphery of the front plate 204, the first packaging film 201, the battery cell 2021, the second packaging film 203 and the back plate 205 is covered with a frame 206;

[0066] The frame 206 includes a first limiting portion 2061, a second limiting portion 2062, a top bearing portion 2063, a side portion 2064, a bottom bearing portion 2065 and an extension portion 2066 which are connected in sequence; a receiving groove 2067 is defined between the first limiting portion 2061, the second limiting portion 2062 and the top bearing portion 2063; the first limiting portion 2061 is arranged opposite to the top bearing portion 2063; a molding cavity 2068 is defined between the side portion 2064, the bottom bearing portion 2065 and the extension portion 2066.

[0067] For details, see Figure 8 As shown, in this embodiment, the periphery of the front plate 204, the first packaging film 201, the battery cell 2021, the second packaging film 203 and the back plate 205 are covered with a frame 206; the frame 206 includes a first limiting portion 2061, a second limiting portion 2062, a top bearing portion 2063, a side portion 2064, a bottom bearing portion 2065 and an extension portion 2066 connected in sequence, and a receiving groove 2067 is surrounded by the first limiting portion 2061, the second limiting portion 2062 and the top bearing portion 2063, and the first limiting portion 2061 is arranged opposite to the top bearing portion 2063; a molding cavity is surrounded by the side portion 2064, the bottom bearing portion 2065 and the extension portion 2066 2068; the front plate 204, the first packaging film 201, the battery cell 2021, the second packaging film 203 and the back plate 205 are stacked to form a laminate, and the receiving groove 2067 is used to clamp the laminate to accommodate the laminate; the cavity 2068 is used to accommodate an external matching structure to fix the frame of the photovoltaic module; wherein the laminate has two opposite surfaces, when the laminate is clamped, the first limiting portion 2061 contacts one of the surfaces of the laminate, and the second limiting portion 2062 contacts the side of the laminate, thereby limiting the position of the laminate entering the receiving groove 2067, and the top bearing portion 2063 contacts the other surface of the laminate to support the laminate.

[0068] When in use, first install the frame 206 to the outer periphery of the upper end of the back plate 205, and install the battery cell 2021 into the frame 206, then cover the upper surface of the battery cell 2021 with the packaging film 100 in sequence, and make the first film layer 101 and the battery cell 2021 in contact. In this process, make the bottom of the packaging film 100 and the welding strip 2022 on the battery cell 2021 in contact, and finally cover the front plate 204 to cover and fix the packaging film 100 to complete the entire assembly; the packaging film 100 adopts three layers The composite extrusion molding process, during the extrusion molding process of the packaging film 100, the surface structure and pattern of the packaging film 100 are customized by changing the surface morphology and embossing method of the molding roller, and the existing stacking process in the production of the photovoltaic module 200 is changed to adapt to the larger height difference of the surface structure of the battery cell 2021 in the production of the photovoltaic module 200, and reduce the stress generated by the production process of the photovoltaic module 200 on the surface of the battery cell 2021; at the same time, the cost of the packaging film 100 is lower and the packaging effect is better.

[0069] It can be seen from the above embodiments that the encapsulation film and photovoltaic module provided by the utility model achieve at least the following beneficial effects:

[0070] The utility model provides an encapsulation film and a photovoltaic module, wherein the encapsulation film comprises a first film layer and a third film layer which are arranged relatively to each other, and a second film layer is further arranged between the first film layer and the third film layer; the first film layer is provided with a first groove, and the first groove is located on a side of the first film layer away from the second film layer; the first groove is provided on the surface of the first film layer, which can effectively reduce the gram weight of the encapsulation film, thereby reducing the cost of the encapsulation film; before subsequent lamination, the encapsulation film needs to be laid on the battery cell, and the first groove is located on the surface of the encapsulation film on the side close to the battery cell, and contacts with the battery cell, which can achieve mechanical anti-slip before lamination, and can also reduce the overall flow of the encapsulation film caused by extrusion during lamination, and achieve local flow of the encapsulation film; the first groove can also fit tightly with the welding strip on the battery cell, thereby improving the overall sealing performance of the photovoltaic module.

[0071] The patent application filed on the same day as the present application is entitled "Encapsulation Film and Photovoltaic Module". The differences between the encapsulation film of the present application and the encapsulation film are as follows: (1) The encapsulation film includes a first film layer, a second film layer and a third film layer, which can improve the PID value, effectively improve the power generation efficiency of the photovoltaic module and save costs; (2) A first groove is provided on the surface of the first film layer away from the second film layer, which can effectively reduce the gram weight of the encapsulation film. When in contact with the battery cell, mechanical anti-slip can be achieved before lamination, thereby improving the overall sealing performance of the photovoltaic module; (3) On the basis of the first groove, a second groove connected to the first groove is provided on the surface of the first film layer away from the second film layer, thereby further reducing the gram weight of the encapsulation film. When in contact with the battery cell, mechanical anti-slip can be achieved before lamination, thereby further improving the overall sealing performance of the photovoltaic module; (4) A tic-tac-toe pattern is provided on the side of the third film layer away from the first film layer, thereby improving the friction of the encapsulation film.

[0072] The patent application filed on the same day as the present application is entitled "Encapsulation Film and Photovoltaic Module". The differences between the photovoltaic module of the present application and the patent application are as follows: (1) A first groove and a second groove connected to the first groove are provided on the surface of the first film layer on the side away from the second film layer, which can effectively reduce the gram weight of the encapsulation film, thereby reducing the cost of the photovoltaic module. The contact with the battery cell can achieve mechanical anti-slip before lamination, thereby improving the overall sealing performance of the photovoltaic module; (2) A criss-cross pattern is provided on the side of the third film layer away from the first film layer, which can increase the friction between the encapsulation film and the front plate and the back plate, thereby preventing the encapsulation film from slipping, thereby ensuring the encapsulation effect of the photovoltaic module; (3) A receiving groove is formed between the first limiting portion, the second limiting portion and the top bearing portion of the frame, which is used to clamp the laminate to accommodate the laminate; a molding cavity is formed between the side edge portion, the bottom bearing portion and the extension portion of the frame, which is used to accommodate an external matching structure to fix the frame of the photovoltaic module.

[0073] Although some specific embodiments of the present invention have been described in detail by way of examples, it should be understood by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the present invention. It should be understood by those skilled in the art that the above embodiments may be modified without departing from the scope and spirit of the present invention. The scope of the present invention is defined by the appended claims.

Claims

1. A packaging film, characterized in that: It includes a first film layer and a third film layer that are arranged opposite to each other, and a second film layer is also arranged between the first film layer and the third film layer; the first film layer is provided with at least one first groove, the first groove is located on the side of the first film layer away from the second film layer, and the first groove extends along a first direction, and the first direction is the length direction of the packaging film.

2. The packaging film according to claim 1, characterized in that: The cross section of the first groove along the second direction is an arc shape that is concave toward the side close to the second adhesive film layer; the second direction intersects with the first direction.

3. The packaging film according to claim 1, characterized in that: At least one second groove is disposed on a side of the first adhesive film layer away from the second adhesive film layer. The second groove extends along a second direction that intersects the first direction. The first groove is connected to the second groove.

4. The packaging film according to claim 3, characterized in that: A cross section of the second groove along the first direction is an arc shape that is concave toward a side close to the second adhesive film layer.

5. The packaging film according to claim 1, characterized in that: A tic-tac-toe pattern is provided on a side of the third adhesive film layer away from the first adhesive film layer, and the tic-tac-toe pattern is convex toward the side away from the first adhesive film layer.

6. The packaging film according to claim 1, characterized in that: The first adhesive film layer and the second adhesive film layer are made of different materials, and the first adhesive film layer and the third adhesive film layer are made of the same material.

7. The packaging film according to claim 1, characterized in that: The materials of the first adhesive film layer and the third adhesive film layer include polyethylene octene co-elastomer; the material of the second adhesive film layer includes ethylene-vinyl acetate copolymer.

8. A photovoltaic module, characterized in that: It comprises a first packaging film, a battery string and a second packaging film which are stacked; the battery string comprises at least two battery cells; two adjacent battery cells are connected by a welding strip; The first encapsulation film and / or the second encapsulation film include a first film layer and a third film layer that are arranged opposite to each other, and a second film layer is further provided between the first film layer and the third film layer; the first film layer is located on a side of the second film layer close to the battery cell; the first film layer of the first encapsulation film and / or the second encapsulation film is provided with at least one first groove, the first groove is located on a side of the first film layer away from the second film layer, the first groove extends along a first direction, the first direction is the length direction of the first encapsulation film and / or the second encapsulation film, and the orthographic projection of at least one welding strip on the plane where the second film layer is located is located within the range of the orthographic projection of the first groove on the plane where the second film layer is located.

9. The photovoltaic module according to claim 8, characterized in that: A front plate is provided on a side of the first packaging film away from the battery cell, and a back plate is provided on a side of the second packaging film away from the battery cell.

10. The photovoltaic module according to claim 9, characterized in that: The peripheries of the front plate, the first packaging film, the battery cell, the second packaging film and the back plate are covered with a frame; The frame includes a first limiting portion, a second limiting portion, a top bearing portion, a side portion, a bottom bearing portion and an extension portion which are connected in sequence; an accommodating groove is defined between the first limiting portion, the second limiting portion and the top bearing portion; the first limiting portion is arranged opposite to the top bearing portion; a molding cavity is defined between the side portion, the bottom bearing portion and the extension portion.

Images