Adhesive film, photovoltaic module and photovoltaic system

Abstract

The utility model is suitable for the field of photovoltaic technology, and provides an adhesive film, a photovoltaic assembly and a photovoltaic system. The photovoltaic system comprises an adhesive film body, the adhesive film body is provided with a plurality of protrusion groups, the protrusion groups are arranged towards a battery piece, each protrusion group comprises a plurality of protrusions which are sequentially arranged at intervals in the first direction, the protrusion groups are sequentially arranged at intervals in the second direction, a flow channel is formed between every two adjacent protrusion groups, the depth of the flow channel is d, and the width of the flow channel is d. The width of the flow channel in the second direction is w, and d is smaller than or equal to w. As the bulges are arranged on the adhesive film and the runners are formed among the bulges, gas can flow out through the runners when the adhesive film is laminated with a battery piece, the gas remaining between the adhesive film and the battery piece is reduced, and the product yield and the long-term reliability are improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of photovoltaics, and in particular relates to an adhesive film, a photovoltaic component and a photovoltaic system. Background Art

[0002] Photovoltaic encapsulation film mainly refers to special film materials used in solar photovoltaic modules to encapsulate and protect photovoltaic cells, such as EVA film and POE film. It can tightly bond photovoltaic cells to the front and rear glass or backplane to form a sealed environment, preventing the cells from being corroded by external factors such as water vapor, oxygen, and dust, and maintaining the efficient working state of the cells.

[0003] However, since the adhesive film is a flexible polyester material and has fluidity during lamination, bubbles will appear between the adhesive film and the solar cells during the lamination and packaging process, thereby affecting the production quality of the photovoltaic modules and the long-term reliability of the photovoltaic modules. Utility Model Content

[0004] The adhesive film, photovoltaic module and photovoltaic system provided by the embodiments of the present invention are intended to solve the problem of bubbles appearing during lamination of adhesive films and solar cells in the prior art.

[0005] In a first aspect, an embodiment of the present invention provides an adhesive film, comprising:

[0006] The adhesive film body is provided with a plurality of protrusion groups, the protrusion groups are arranged toward the battery cell, each of the protrusion groups includes a plurality of protrusions arranged in sequence along the first direction, and the plurality of protrusion groups are arranged in sequence along the second direction. A flow channel is formed between each adjacent two protrusion groups, the depth of the flow channel is d, and the width of the flow channel along the second direction is w, wherein d≤w.

[0007] Furthermore, the protrusions in each protrusion group are arranged in a one-to-one correspondence along the second direction, so that crisscrossing gas outflow channels are formed on the film body between the protrusions.

[0008] Furthermore, along the first direction, the distance between each two adjacent protrusions is L, where L=w.

[0009] Furthermore, the flow channel extends to the edge of the film body.

[0010] Furthermore, the area of ​​the region where the protrusion is provided on the adhesive film body is larger than the area of ​​the battery cell.

[0011] Furthermore, the depth d is in the range of 0.05 mm ≤ d ≤ 1.0 mm.

[0012] Furthermore, the width w is in the range of 0.1 mm ≤ w ≤ 5.0 mm.

[0013] Furthermore, the area s of the protrusion is in the range of 1mm 2 ≤s≤900mm 2 .

[0014] In a second aspect, an embodiment of the present invention provides a photovoltaic module, comprising:

[0015] The encapsulation layer is made of the above-mentioned adhesive film.

[0016] In a third aspect, an embodiment of the present invention provides a photovoltaic system, comprising the photovoltaic assembly described above.

[0017] Beneficial effects achieved by the utility model:

[0018] By arranging multiple protrusion groups on the side of the film body facing the battery cell, and each protrusion group includes multiple protrusions arranged along the first direction x, the multiple protrusion groups are spaced along the second direction y, and a flow channel is formed between each two adjacent protrusion groups, so that when the film and the battery cell are laminated, the gas can flow out through the flow channel and through the gap between each two protrusions, thereby reducing the residual gas between the film and the battery cell, improving the product yield and long-term reliability, and setting the depth d of the flow channel to be ≤ the width w of the flow channel along the second direction y, so that the flow channel can form a structure roughly like a "V" shape, which is conducive to the discharge of gas after the film body is subjected to force. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic structural diagram of the adhesive film provided by an embodiment of the present utility model;

[0020] Figure 2 yes Figure 1 The enlarged schematic diagram of point I in the middle;

[0021] Figure 3 It is a schematic structural diagram of the protrusion of an embodiment of the utility model.

[0022] Explanation of the main component symbols: 100-film, 10-film body, 11-protrusion group, 12-protrusion, 20-flow channel. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0024] Briefly describe the distinguishing features between the present invention and the prior art, which constitute the utility model's points of use.

[0025] The adhesive film 100 is used to encapsulate the solar cells, creating a sealed environment during the photovoltaic conversion process. This protects the cells from external factors such as moisture, oxygen, and dust, maintaining efficient operation. However, during encapsulation, the adhesive film 100 and the cells are placed in a conventional environment, leaving air between them. Furthermore, the adhesive film 100 is made of a resin material, which undergoes a cross-linking reaction during the lamination process, releasing gas. This gas can remain between the adhesive film 100 and the cells after encapsulation, affecting the production quality and long-term reliability of the solar cell.

[0026] Example 1

[0027] See also Figures 1 to 3 , which is a first embodiment of the present invention, provides an adhesive film 100 , including an adhesive film body 10 .

[0028] Among them, a plurality of protrusion groups 11 are provided on the film body 10. Specifically, the protrusion groups 11 are arranged toward the battery cell. Each protrusion group 11 includes a plurality of protrusions 12 arranged in sequence along the first direction x. The plurality of protrusion groups 11 are arranged in sequence along the second direction y. A flow channel 20 is formed between each adjacent two protrusion groups 11. The depth of the flow channel 20 is d, and the width of the flow channel 20 along the second direction y is w, wherein d≤w.

[0029] The above-mentioned adhesive film 100 is provided with a plurality of protrusion groups 11 on a side of the adhesive film body 10 facing the battery cell, and each protrusion group 11 includes a plurality of protrusions 12 arranged along a first direction x. The plurality of protrusion groups 11 are spaced apart along a second direction y, and a flow channel 20 is formed between each two adjacent protrusion groups 11. When the adhesive film 100 and the battery cell are laminated, gas can flow out through the flow channel 20 and through the space between each two protrusions 12, thereby reducing the residual gas between the adhesive film 100 and the battery cell and improving the product yield and long-term reliability. The depth d of the flow channel 20 is set to be ≤ the width w of the flow channel 20 along the second direction y, so that the flow channel 20 can form a structure roughly like a "V" shape, which is conducive to the discharge of gas after the adhesive film body 10 is subjected to force.

[0030] The adhesive film 100 of this embodiment may be an EVA film, a POE film, or a PE film. The thickness of the adhesive film body 10 may be set to 0.4 mm-0.6 mm, for example, 0.4 mm, 0.45 mm, 0.5 mm, 0.55 mm, or 0.6 mm, etc., which is not limited here.

[0031] Example 2

[0032] In one embodiment of the present invention, to improve gas exhaust efficiency, the protrusions 12 are also arranged in rows along the second direction y. That is, the protrusions 12 in each protrusion group 11 are arranged one-to-one along the second direction y. In this way, the protrusions 12 are arranged on the film body 10 in a regular pattern, so that the protrusions 12 form a regular criss-cross pattern of gas outflow channels on the film body 10. This not only facilitates the formation of the protrusions 12 on the film body 10, but also allows the gas to have greater freedom of flow when the film 100 and the battery cells are laminated, allowing the gas to flow in different directions, facilitating gas exhaust and increasing exhaust efficiency. In addition, because the protrusions 12 are provided on the surface of the film body 10, each protrusion 12 has a smaller contact area with the battery cell, which increases the friction during lamination with the battery cell and prevents the battery cell from slipping.

[0033] Optionally, when the protrusion groups 11 are arranged along the second direction y, the protrusion groups 11 can be arranged in a staggered manner, that is, the protrusions 12 in each two adjacent protrusion groups 11 are staggered with each other and have overlapping parts, which can also achieve the effect of multi-flow path of gas.

[0034] Example 3

[0035] For the sake of convenience of description, the flow channel 20 formed between the protrusion groups 11 along the second direction y is named as flow channel 20a, and the flow channel 20 formed between the protrusions 12 along the first direction x is named as flow channel 20b, that is, all the flow channels 20a and flow channels 20b constitute a gas outflow channel. When setting the flow channel 20a and the flow channel 20b, the flow channel 20a and the flow channel 20b can be set to have the same width, or the width of the flow channel 20a can be set to be greater than the width of the flow channel 20b, or the width of the flow channel 20a can be set to be smaller than the width of the flow channel 20b, both of which can realize the discharge of gas in the longitudinal and transverse directions; when setting the depth of the flow channel 20a and the flow channel 20b, the flow channel 20a and the flow channel 20b can be set to have the same depth, or the depth of the flow channel 20a can be set to be greater than the depth of the flow channel 20b, or the depth of the flow channel 20a can be set to be smaller than the depth of the flow channel 20b, which is not limited here.

[0036] To further facilitate the formation of the protrusions 12 on the film body 10, the spacing between each two adjacent protrusions along the first direction x is L, where L = w. This means that the flow channels 20a and 20b have the same width. This allows the protrusions 12 to be evenly and regularly arranged on the film body 10, facilitating the formation of the protrusions 12 on the film body 10, thereby achieving higher molding efficiency and reducing molding costs. Furthermore, the flow channels 20a and 20b can also have the same depth w.

[0037] Among them, when forming the protrusion 12 on the film body 10, rolling pressure can be applied to the film body 10 by means of a roller, so as to form the protrusion 12 on the film body 10; or the mesh cloth and the release film can be pre-laminated on the film body 10 by means of a mesh cloth and a release film. When the mesh cloth and the release film are removed, the protrusion 12 can be formed on the surface of the film body 10.

[0038] Example 4

[0039] Furthermore, to facilitate gas exhaust, the flow channels 20 extend to the edges of the film body 10. Thus, when the film 100 and the cell are laminated, the gas flows along the flow channels 20 toward the edges of the film body 10 and is ultimately exhausted from the edges, improving the yield of the laminated product. Specifically, both the flow channels 20a and 20b extend to the edges of the film body 10, resulting in higher exhaust efficiency.

[0040] It is understandable that in order to extend the flow channel 20 to the edge of the film body 10 , a portion of the protrusion 12 may be provided to connect to the edge of the film body 10 .

[0041] Example 5

[0042] Among them, when the protrusions 12 are opened on the film 100, in order to ensure the effect of pressing with the battery cell, the area of ​​the region where the protrusions 12 are set on the film body 10 is larger than the area of ​​the battery cell, so as to cover the entire battery cell, thereby ensuring that when laminating with the battery cell, the air between the battery cell and the battery cell can flow through the flow channel 20 and be discharged, avoiding being left between the film 100 and the battery cell.

[0043] Example 6

[0044] The original thickness of the film body 10 ranges from 0.4 mm to 0.6 mm. When setting the depth of the flow channel 20, the depth d of the flow channel 20 ranges from 0.05 mm to d and from 1.0 mm to 1.0 mm. This means that the depth of the flow channel 20 can be less than the thickness of the film body 10. Alternatively, when the protrusions 12 are formed on the film body 10, pressure is applied to the film body 10, causing deformation along the thickness direction of the film body 10. This can also cause deformation on the other surface of the film body 10 not provided with the protrusions 12. This can cause the depth of the flow channel 20 to be greater than the original thickness of the film body 10. Therefore, the depth of the flow channel 20 can be set to be greater than 0.6 mm. This depth setting of 0.05 mm to 1.0 mm prevents a too small depth from affecting gas discharge efficiency, while also preventing a too large depth from hindering gas discharge during lamination of the film body 10 with the cell.

[0045] The depth d of the flow channel 20 may be set to values ​​such as 0.05 mm, 0.1 mm, 0.20 mm, 0.4 mm, 0.6 mm, 0.8 mm, and 1.0 mm, which are not limited here.

[0046] Example 7

[0047] Furthermore, the width w of the flow channel 20 is in the range of 0.1mm≤w≤5mm. By setting this width range, the width of the flow channel 20 is not too large, resulting in too few protrusions 12, affecting the number of protrusions 12, and thus affecting the friction between the battery cells during lamination; and the width of the flow channel 20 is not too large, which affects the pressure of the gas flow; at the same time, the width range is set, so that the width of the flow channel 20 is not too small, avoiding the rapid deformation of the protrusions 12 during lamination, which occupies the area of ​​the flow channel 20 and affects the outflow of gas.

[0048] The width w of the flow channel 20 may be set to values ​​such as 0.1 mm, 1.0 mm, 2.0 mm, 3.0 mm, 4.0 mm or 5.0 mm, which is not limited here.

[0049] Furthermore, since the depth d is set to be smaller than the width w, in some embodiments of the present invention, when the depth d is set to 0.05 mm, the width w can be set to 1.0 mm; when the depth d is set to 1.0 mm, the width w can be set to 5.0 mm.

[0050] Example 8

[0051] The coverage area of ​​a single film 100 is at least 1.0 m 2 When a single protrusion 12 is set, the area of ​​the protrusion 12 is within the range of 1mm 2 ≤s≤900mm 2 At this time, the area of ​​the protrusions 12 is neither too large nor too small, so that a certain number of protrusions 12 can be provided on the surface of the film 100 , which is conducive to the collection and discharge of gas in the flow channel 20 .

[0052] For example, the area of ​​the protrusion 12 can be set to 1mm 2 , 10mm 2 , 50mm 2 , 100mm 2 , 200mm 2 , 300mm 2 , 400mm 2 , 500mm 2 , 600mm 2 , 700mm 2 , 800mm 2or 900mm 2 The numerical values ​​are not limited here.

[0053] Among them, see Figure 3 The cross-sectional shape of the protrusion 12 can be set to a trapezoidal, elliptical or spherical shape, so as to achieve the effect that the depth d of the flow channel 20 is smaller than the width w.

[0054] Furthermore, when the protrusion 12 is provided, the width of the protrusion 12 may be provided to be equal to the width w of the flow channel 20 , or may be provided to be greater than the width w of the flow channel 20 , which is not limited herein.

[0055] The above-mentioned adhesive film 100 is provided with the protrusions 12 in each protrusion group 11 arranged one by one along the second direction y, and the protrusions 12 are arranged on the adhesive film body 10 in a regular manner so that the protrusions 12 form regular crisscross gas outflow channels on the adhesive film body 10, thereby not only facilitating the formation of the protrusions 12 on the adhesive film body 10, but also enabling the gas to have greater flow freedom when the adhesive film 100 and the battery cell are laminated, and to flow out in different directions, thereby facilitating the discharge of the gas and increasing the exhaust efficiency; by setting the flow channel 20 to extend When the film 100 and the battery cell are laminated, the gas gradually flows toward the edge of the film body 10 along the flow channel 20 and is finally discharged from the edge of the film body 10, thereby improving the yield rate of the laminated product. By setting the surface area of ​​the region where the protrusions 12 are provided on the film body 10 to be larger than the area of ​​the battery cell, it is ensured that when the film 100 and the battery cell are laminated, the air between the battery cell and the flow channel 20 can flow and be discharged, thereby avoiding being left between the film 100 and the battery cell. By setting the area of ​​the protrusions 12 to 1mm 2 ≤s≤900mm 2 Within the range of , the setting area of ​​the protrusion 12 is not too large or too small, which is conducive to the collection and discharge of gas in the flow channel 20.

[0056] Example 9

[0057] In a ninth embodiment, the present invention provides a photovoltaic module, comprising an encapsulation layer, wherein the encapsulation layer is made of the aforementioned adhesive film 100 .

[0058] Among them, the photovoltaic module also includes solar cells, backboards, photovoltaic glass and metal frames. The adhesive film 100 and the solar cells undergo a lamination process, and the adhesive film 100 forms an encapsulation layer. It can be set on the front and back of the solar cells to achieve the effect of isolating the solar cells from water and oxygen. As a filler, it can be a transparent colloid with good light transmittance and aging resistance to avoid affecting the solar cells' absorption of light.

[0059] Photovoltaic glass can cover the encapsulation layer on the front side of the cell. The photovoltaic glass can be ultra-white glass, which has high light transmittance, high transparency, and excellent physical, mechanical and optical properties. For example, the light transmittance of ultra-white glass can reach more than 92%, which can protect the cell without affecting the efficiency of the cell as much as possible.

[0060] The backsheet can be attached to the encapsulation layer on the back of the solar cell. It protects and supports the solar cell and offers reliable insulation, water resistance, and aging resistance. Multiple backsheet options are available, typically including tempered glass, organic glass, and aluminum alloy TPT composite film. The specific backsheet configuration can be tailored to the specific situation and is not limited here. The backsheet, solar cell, encapsulation layer, and photovoltaic glass can be mounted on a metal frame. The metal frame serves as the primary external support structure for the entire photovoltaic module and provides stable support and installation. For example, the metal frame allows the solar module to be installed in the desired location.

[0061] In the above-mentioned photovoltaic module, since the surface of the film for laminating the solar cells is provided with protrusions 12, flow channels 20 are formed between the protrusions 12, and the depth d of the flow channel 20 is set to be greater than or equal to the width w of the flow channel 20 along the second direction y, the flow channel 20 can form a structure roughly like a "V" shape, which is conducive to the discharge of gas after the film body 10 is subjected to force. In this way, the photovoltaic module can be more stable during subsequent use and have long-term reliability.

[0062] Example 10

[0063] The present invention further provides a photovoltaic system in a tenth embodiment, including the above-mentioned photovoltaic assembly.

[0064] Among them, photovoltaic systems can be used in photovoltaic power stations, such as ground power stations, rooftop power stations, water surface power stations, etc., and can also be used in equipment or devices that use solar energy to generate electricity, such as user solar power supplies, solar street lights, solar cars, solar buildings, etc. Of course, it is understandable that the application scenarios of photovoltaic systems are not limited to this, that is to say, photovoltaic systems can be used in all fields that require solar energy to generate electricity. Taking the photovoltaic power generation system network as an example, the photovoltaic system may include a photovoltaic array, a junction box and an inverter. The photovoltaic array can be an array combination of multiple photovoltaic modules. For example, multiple photovoltaic modules can form multiple photovoltaic arrays. The photovoltaic array is connected to the junction box. The junction box can converge the current generated by the photovoltaic array. The converged current flows through the inverter to be converted into the alternating current required by the mains power grid and then connected to the mains power network to achieve solar power supply.

[0065] In the above-mentioned photovoltaic system, since, when preparing the photovoltaic module, the surface of the film for laminating the solar cells is provided with protrusions 12, flow channels 20 are formed between the protrusions 12, and the depth d of the flow channel 20 is set to be ≥ the width w of the flow channel 20 along the second direction y, the flow channel 20 can form a structure roughly like a "V" shape, which is conducive to the discharge of gas after the film body 10 is subjected to force. In this way, the photovoltaic system can be more stable during subsequent use.

[0066] It is understandable that those skilled in the art can, under the guidance of the above embodiments, combine various implementation methods in the above embodiments to obtain technical solutions of multiple implementation methods.

[0067] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A film, characterized in that: include: The adhesive film body is provided with a plurality of protrusion groups, the protrusion groups are arranged toward the battery cell, each of the protrusion groups includes a plurality of protrusions arranged in sequence along the first direction, and the plurality of protrusion groups are arranged in sequence along the second direction. A flow channel is formed between each adjacent two protrusion groups, the depth of the flow channel is d, and the width of the flow channel along the second direction is w, wherein d≤w.

2. The adhesive film according to claim 1, wherein The protrusions in each protrusion group are arranged in a one-to-one correspondence along the second direction, so that crisscrossing gas outflow channels are formed on the film body between the protrusions.

3. The adhesive film according to claim 2, wherein Along the first direction, the distance between each two adjacent protrusions is L, where L=w.

4. The adhesive film according to claim 1, wherein The flow channel extends to the edge of the film body.

5. The adhesive film according to claim 1, wherein The area of ​​the region of the adhesive film body where the protrusion is provided is larger than the area of ​​the battery cell.

6. The adhesive film according to claim 1, wherein The range of the depth d is 0.05 mm ≤ d ≤ 1.0 mm.

7. The adhesive film according to claim 1, wherein The range of the width w is 0.1 mm ≤ w ≤ 5.0 mm.

8. The adhesive film according to claim 1, wherein The area s of the protrusion is in the range of 1mm 2 ≤s≤900mm 2 .

9. A photovoltaic module, characterized in that include: The encapsulation layer is made of the adhesive film according to any one of claims 1 to 8.

10. A photovoltaic system, characterized in that Comprising the photovoltaic module according to claim 9.

Images