Photovoltaic module
By setting up a POE bearing film on the front of the cell of the photovoltaic module and ensuring full coverage, the problem of incomplete packaging of the POE layer is solved, and the anti-PID performance and reliability of the photovoltaic module are improved.
Patent Information
- Application Number
- CN202421912312.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-07
- Publication Date
- 2025-06-03
- Estimated Expiration
- 2034-08-07
AI Technical Summary
After the existing photovoltaic module is packaged and laminated, the POE layer may not fully cover the front of the cell, affecting the reliability and PID resistance of the photovoltaic module.
A POE bearing film is provided on the front of the battery cell, and after production is completed, ensuring that the POE bearing film completely covers the front of the battery cell, thereby improving the coverage reliability of the packaging layer.
Through the complete coverage of the POE bearing film, the potential-induced attenuation performance and reliability of the photovoltaic module are improved, ensuring the efficient operation of the photovoltaic module.
Smart Images
Figure CN222941154U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of photovoltaics, and more particularly to a photovoltaic module. Background Art
[0002] The anti-PID (potential induced degradation performance) performance of a photovoltaic module is an important parameter affecting the working reliability of the photovoltaic module. In the related art, a multi-layer structural adhesive film is provided between the front side of the cell and the panel, and the multi-layer adhesive film contains a POE layer to improve the anti-PID performance of the photovoltaic module. However, after encapsulation and lamination, the POE layer may not completely cover the front side of the cell, thereby affecting the reliability of the photovoltaic module. Summary of the Utility Model
[0003] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, the utility model provides a photovoltaic module with relatively high reliability.
[0004] The photovoltaic module according to the utility model includes: a cell; a POE carrier film disposed on the front side of the cell; a front encapsulation layer and a panel, the front encapsulation layer being hermetically connected between the panel and the POE carrier film.
[0005] For the photovoltaic module according to the utility model, by disposing a POE carrier film on the front side of the cell, the reliability that the POE carrier film completely covers the front side of the cell after production is relatively high, thereby improving the anti-potential induced degradation performance and reliability of the photovoltaic module.
[0006] In some embodiments according to the utility model, the POE carrier film satisfies the following conditions: the grammage is 60 g / m 2 -120 g / m 2 , and the pre-crosslinking degree is 30%-50%.
[0007] In some embodiments according to the utility model, the front encapsulation layer is an EVA layer.
[0008] In some embodiments according to the utility model, the front encapsulation layer satisfies the following conditions: the grammage is 260 g / m 2 -400 g / m 2 , and the pre-crosslinking degree is 10%-15%.
[0009] In some embodiments according to the utility model, the photovoltaic module further includes: an EVA carrier film disposed on the back side of the cell; a back encapsulation layer and a back plate, the back encapsulation layer being hermetically connected between the EVA carrier film and the back plate.
[0010] According to some embodiments of the present utility model, the EVA carrier film meets the following conditions: the grammage is 60 g / m 2 -120 g / m 2 , and the pre-crosslinking degree is 30%-50%.
[0011] According to some embodiments of the present utility model, the back encapsulation layer is an EVA layer.
[0012] According to some embodiments of the present utility model, the back encapsulation layer meets the following conditions: the grammage is 260 g / m 2 -400 g / m 2 .
[0013] According to some embodiments of the present utility model, fine grid lines are provided on both the front and back of the battery cell. There are multiple battery cells, and the photovoltaic module further includes: a busbar member, which is connected to the fine grid lines of the battery cells to connect multiple battery cells in series. Among them, the POE carrier film covers the busbar member and the fine grid lines on the front of the battery cells, and the EVA carrier film covers the busbar member and the fine grid lines on the back of the battery cells.
[0014] According to some embodiments of the present utility model, the busbar member is a solder ribbon, and the solder ribbon is welded to the fine grid lines.
[0015] Additional aspects and advantages of the present utility model will be partially given in the following description, partially become apparent from the following description, or be understood through the practice of the present utility model. Description of the Drawings
[0016] Figure 1 is a schematic diagram of a photovoltaic module according to an embodiment of the present utility model.
[0017] Reference Numerals:
[0018] 100, photovoltaic module;
[0019] 10, battery cell;
[0020] 20, POE carrier film;
[0021] 30, front encapsulation layer;
[0022] 40, panel;
[0023] 50, EVA carrier film;
[0024] 60, back encapsulation layer;
[0025] 70, backplane;
[0026] 80, busbar member. Detailed Embodiments
[0027] Embodiments of the present utility model will be described in detail below. Examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals represent the same or similar elements or elements with the same or similar functions throughout. The embodiments described below by referring to the accompanying drawings are exemplary and are intended to explain the present utility model and should not be construed as a limitation to the present utility model.
[0028] Reference will be made below Figure 1 to describe a photovoltaic module 100 according to an embodiment of the present utility model.
[0029] As Figure 1 shown, a photovoltaic module 100 according to an embodiment of the present utility model includes: a solar cell 10, a POE (Polyolefin Elastomer) carrier film 20, a front encapsulation layer 30, and a panel 40.
[0030] Specifically, the POE carrier film 20 is disposed on the front side of the solar cell 10, and the front encapsulation layer 30 is hermetically connected between the panel 40 and the POE carrier film 20.
[0031] Among them, the front side of the solar cell 10 is the side irradiated by the sun. The POE carrier film 20, the front encapsulation layer 30, and the panel 40 are all light-transmitting members. Preferably, the panel 40 is a glass plate. It can be understood by those skilled in the art that the POE carrier film 20 has a relatively high barrier property, which can reduce ion migration on the photovoltaic module 100, and the water vapor transmission rate of the POE carrier film 20 is relatively low, which can reduce the erosion of water vapor on the solar cell 10. In addition, the volume resistivity of the POE carrier film 20 is relatively high, which can reduce the probability of short circuit of the solar cell 10. Thus, the anti-potential-induced degradation performance of the photovoltaic module 100 can be improved.
[0032] During the production process, it is relatively easy for the POE carrier film 20 to completely cover the front side of the solar cell 10, and during the lamination process of the photovoltaic module 100, the front encapsulation layer 30 has little influence on the coverage of the POE carrier film 20 on the front side of the solar cell 10. Thus, the reliability of the barrier of the POE carrier film 20 on the front side of the solar cell 10 after production can be improved. At the same time, after the POE carrier film 20 is disposed on the front side of the solar cell 10, there is no need to add materials for improving the anti-potential-induced degradation performance of the photovoltaic module 100 in the front encapsulation layer 30. The front encapsulation layer 30 can use a single material, and during the lamination process of the photovoltaic module 100, the front encapsulation layer 30 can be more evenly distributed between the POE carrier film 20 and the panel 40, thereby improving the sealing reliability of the front encapsulation layer 30. Thus, the reliability of the photovoltaic module 100 can be improved.
[0033] According to the photovoltaic module 100 of the embodiments of the present utility model, by providing a POE carrier film 20 on the front side of the cell 10, after production, the POE carrier film 20 completely covers the front side of the cell 10 with relatively high reliability, thereby improving the potential-induced degradation resistance performance and reliability of the photovoltaic module 100.
[0034] In some embodiments of the present utility model, the POE carrier film 20 satisfies the following conditions: the grammage is 60 g / m2 - 120 g / m2. For example, the grammage can be 60 g / m2, 70 g / m2, 82 g / m2, 91 g / m2, 113 g / m2 or 120 g / m2. The pre-crosslinking degree is 30% - 50%. For example, the pre-crosslinking degree can be 30%, 32%, 40%, 47% or 50%. Thus, the performance of the POE carrier film 20 can meet the usage requirements of the photovoltaic module 100. During the product design process, the grammage and pre-crosslinking degree of the POE carrier film 20 can be adjusted to meet more product design requirements.
[0035] In some embodiments of the present utility model, the front encapsulation layer 30 is an EVA (Ethylene-Vinyl Acetate Copolymer) layer. The EVA has a relatively low density, good waterproof performance and strong chemical stability. Thus, it is beneficial to realize the lightweight of the photovoltaic module 100 and further improve the reliability of the photovoltaic module 100.
[0036] In some embodiments of the present utility model, the front encapsulation layer 30 satisfies the following conditions: the grammage is 260 g / m2 - 400 g / m2. For example, the grammage can be 260 g / m2, 290 g / m2, 301 g / m2, 326 g / m2, 376 g / m2 or 400 g / m2. The pre-crosslinking degree is 10% - 15%. For example, the pre-crosslinking degree can be 10%, 11%, 12%, 14.7% or 15%. Thus, the performance of the front encapsulation layer 30 can meet the usage requirements. During the product design process, the grammage and pre-crosslinking degree of the front encapsulation layer 30 can be adjusted to meet more product design requirements.
[0037] In some embodiments of the present utility model, the photovoltaic module 100 further includes: an EVA carrier film 50, a back encapsulation layer 60 and a back plate 70.
[0038] Specifically, the EVA carrier film 50 is disposed on the back side of the cell 10, and the back encapsulation layer 60 is hermetically connected between the EVA carrier film 50 and the back plate 70. Thus, the encapsulation of the back side of the cell 10 can be realized, and the process difficulty during production can be reduced. Among them, preferably, the back plate 70 is a glass plate.
[0039] In some embodiments of the present utility model, the EVA carrier film 50 meets the following conditions: the grammage is 60 g / m2 - 120 g / m2. For example, the grammage can be 60 g / m2, 70 g / m2, 82 g / m2, 91 g / m2, 113 g / m2 or 120 g / m2. The pre-crosslinking degree is 30% - 50%. For example, the pre-crosslinking degree can be 30%, 32%, 40%, 47% or 50%. Thus, the performance of the EVA carrier film 50 can meet the usage requirements of the photovoltaic module 100. During the product design process, the grammage and pre-crosslinking degree of the EVA carrier film 50 can be adjusted to meet more product design requirements.
[0040] In some embodiments of the present utility model, the back encapsulation layer 60 is an EVA layer. The EVA has a low density, good waterproof performance and strong chemical stability. Thus, it is beneficial to achieve the lightweight of the photovoltaic module 100 and further improve the reliability of the photovoltaic module 100.
[0041] In some embodiments of the present utility model, the back encapsulation layer 60 meets the following conditions: the grammage is 260 g / m2 - 400 g / m2. For example, the grammage can be 260 g / m2, 290 g / m2, 301 g / m2, 326 g / m2, 376 g / m2 or 400 g / m2. Thus, the performance of the back encapsulation layer 60 can meet the usage requirements. During the product design process, the grammage and pre-crosslinking degree of the back encapsulation layer 60 can be adjusted to meet more product design requirements.
[0042] In some embodiments of the present utility model, both the front and back of the battery cell 10 are provided with fine grid lines. There are multiple battery cells 10. The photovoltaic module 100 further includes: a busbar 80. The busbar 80 is connected to the fine grid lines of the battery cells 10 to connect multiple battery cells 10 in series. Among them, the POE carrier film 20 covers the busbar 80 and the fine grid lines on the front of the battery cell 10, and the EVA carrier film 50 covers the busbar 80 and the fine grid lines on the back of the battery cell 10. During the operation of the photovoltaic module 100, the fine grid lines transfer the current on the battery cell 10 to the busbar 80. After being collected by the busbar 80, the current on multiple battery cells 10 is output outward. The POE carrier film 20 can provide protection for the busbar 80 and the fine grid lines on the front, and the EVA carrier film 50 can provide protection for the busbar 80 and the fine grid lines on the back. By directly transferring the current to the busbar 80 through the fine grid lines, the grid line area on the battery cell 10 can be saved, thereby reducing the production cost.
[0043] In some embodiments of the present utility model, the busbar 80 is a solder strip, and the solder strip is welded to the fine grid lines. The welded connection has high reliability and can achieve the electrical connection between the solder strip and the fine grid lines, thereby improving the reliability during the operation of the photovoltaic module 100.
[0044] A specific embodiment of the photovoltaic module 100 according to the present utility model will be described below.
[0045] The photovoltaic module 100 includes: a plurality of solar cells 10, a POE carrier film 20, a front encapsulation layer 30, a panel 40, an EVA carrier film 50, a back encapsulation layer 60, a backplane 70, and a bus bar 80. Among them, the front encapsulation layer 30 and the back encapsulation layer 60 are EVA layers, and the bus bar 80 is a solder strip.
[0046] Specifically, fine grid lines are provided on both the front and back of the solar cell 10. The bus bar 80 is welded to the fine grid lines on the solar cell 10 to connect a plurality of solar cells 10 in series. The POE carrier film 20 is disposed on the front of the solar cell 10 and covers the solder strip and the fine grid lines located on the front of the solar cell 10. The front encapsulation layer 30 is hermetically connected between the POE carrier film 20 and the panel 40. The EVA carrier film 50 is disposed on the back of the solar cell 10 and covers the solder strip and the fine grid lines located on the back of the solar cell 10. The back encapsulation layer 60 is hermetically connected between the EVA carrier film 50 and the backplane 70.
[0047] The production process of the photovoltaic module 100 will be described below.
[0048] First, solder, a solder strip, and the POE carrier film 20 are placed on the front of the solar cell 10, and the POE carrier film 20 is attached to the front of the solar cell 10 by heating with a stringer welder. At the same time, the POE carrier film 20 fixes the solder strip and the solder on the front of the solar cell 10. Then, solder, a solder strip, and the EVA carrier film 50 are placed on the back of the solar cell 10, and the EVA carrier film 50 is attached to the back of the solar cell 10 by heating with a stringer welder. At the same time, the EVA carrier film 50 fixes the solder strip and the solder on the back of the solar cell 10. Subsequently, an EVA film, the solar cell 10 with the POE carrier film 20 and the EVA carrier film 50 attached, an EVA film, and the panel 40 are stacked in sequence on the backplane 70. Then, the photovoltaic module 100 is laminated, and the photovoltaic module 100 is heated for a certain period of time during the lamination process. The EVA film melts and then solidifies to form the front encapsulation layer 30 and the back encapsulation layer 60, and the solder melts and then solidifies to weld the solder strip to the fine grid lines. Thus, the production process of the photovoltaic module 100 is completed.
[0049] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present utility model.
[0050] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present utility model, "a plurality of" means two or more unless otherwise specifically defined.
[0051] In the present utility model, unless otherwise clearly defined and limited, the terms "mounted", "connected", "connected to", "fixed", etc. shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection, an electrical connection, or a communication connection; it may be directly connected, or indirectly connected through an intermediate medium, and it may be the internal communication of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.
[0052] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.
[0053] Although the embodiments of the present utility model have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and purposes of the present utility model. The scope of the present utility model is defined by the claims and their equivalents.
Claims
1. A photovoltaic module, characterized in that: include: Battery cells; POE carrier film, the POE carrier film is arranged on the front side of the battery cell; A front packaging layer and a panel, wherein the front packaging layer is sealed and connected between the panel and the POE carrier film.
2. The photovoltaic module according to claim 1, characterized in that: The POE carrier film meets the following conditions: Weight: 60g / m 2 -120 g / m 2 , the pre-crosslinking degree is 30%-50%.
3. The photovoltaic module according to claim 1, characterized in that: The front packaging layer is an EVA layer.
4. The photovoltaic module according to claim 3, characterized in that: The front encapsulation layer meets the following conditions: Weight: 260g / m 2 -400 g / m 2 , the pre-crosslinking degree is 10%-15%.
5. The photovoltaic module according to any one of claims 1 to 4, characterized in that: Also includes: An EVA carrier film, the EVA carrier film being arranged on the back side of the battery cell; A back side encapsulation layer and a back plate, wherein the back side encapsulation layer is sealed and connected between the EVA carrier film and the back plate.
6. The photovoltaic module according to claim 5, characterized in that: The EVA carrier film meets the following conditions: Weight: 60g / m 2 -120 g / m 2 , the pre-crosslinking degree is 30%-50%.
7. The photovoltaic module according to claim 5, characterized in that: The back side packaging layer is an EVA layer.
8. The photovoltaic module according to claim 7, characterized in that: The backside encapsulation layer meets the following conditions: Weight: 260g / m 2 -400 g / m 2 .
9. The photovoltaic module according to claim 5, characterized in that: The front and back sides of the battery cell are provided with fine grid lines, and there are multiple battery cells. The photovoltaic module also includes: a busbar, which is connected to the fine grid lines of the battery cell to connect the multiple battery cells in series, wherein the POE carrier film covers the busbar and the fine grid lines on the front side of the battery cell, and the EVA carrier film covers the busbar and the fine grid lines on the back side of the battery cell.
10. The photovoltaic module according to claim 9, characterized in that: The current collector is a welding strip, and the welding strip is connected to the fine grid lines by welding.