Photovoltaic module

Abstract

The photovoltaic module comprises a first glass layer, a first adhesive film layer, a battery piece group, a second adhesive film layer and a second glass layer which are connected in sequence, the battery piece group comprises a bus bar, the end portion of the bus bar is provided with a leading-out end, the first glass layer is provided with a leading-out hole, the leading-out end penetrates through the leading-out hole, and the second glass layer is provided with a lead-out hole. The leading-out hole is filled with filling glue, and the filling glue seals the hole wall of the leading-out hole and the circumferential direction of the leading-out end. According to the utility model, the problems of hole cracking, air bubbles and overflowed glue wrapping of a leading-out wire when the photovoltaic module enters a laminating machine process are solved.

Description

Technical Field

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

[0002] In the existing photovoltaic module production process, in order to collect the electricity generated by the photovoltaic module's photovoltaic power generation and output it, a hole is drilled in the back glass, and the busbar is led out and then welded to an external junction box. The photovoltaic module enters the laminator process, where it undergoes vacuum evacuation and lamination and heating. Due to the hole in the back glass, the large airflow during vacuum evacuation can easily cause cracks at the hole location. During the lamination and heating process, the downward pressure of the silicone plate impacts the hole location, squeezing out the adhesive film inside the photovoltaic module at the hole location. This leads to a lack of adhesive at the hole location, creating bubbles, and overflowing adhesive at the hole location, wrapping around the busbar lead wires. This overflowing adhesive wrapping around the lead wires can lead to a safety hazard of cold solder joints after welding to the external junction box. The occurrence of hole cracks, bubbles, and overflowing adhesive wrapping around the lead wires at the hole location on the back glass also affects the quality of the photovoltaic module. Utility Model Content

[0003] The purpose of this utility model is to solve the above technical problems and provide a photovoltaic module, so as to achieve the glue filling and curing treatment at the lead-out hole position of the glass, thereby avoiding the problems of hole cracks, bubbles, and glue overflow and wrapping of the lead-out wires when the photovoltaic module enters the laminating process. In order to achieve the above purpose, the technical solution of this utility model is as follows:

[0004] A photovoltaic module includes a first glass layer, a first adhesive film layer, a battery cell group, a second adhesive film layer, and a second glass layer connected in sequence. The battery cell group includes a bus bar, and the end of the bus bar is provided with a lead-out terminal. A lead-out hole is opened on the first glass layer, and the lead-out terminal passes through the lead-out hole. The lead-out hole is filled with a filling glue, and the filling glue seals the hole wall of the lead-out hole and the circumference of the lead-out terminal.

[0005] Specifically, the bus bar and the lead-out end are arranged perpendicularly relative to each other, and the lead-out end is spaced apart from the hole wall of the lead-out hole.

[0006] Specifically, the filling depth of the filling glue is not greater than the axial distance of the lead-out hole, and is not less than half the axial distance of the lead-out hole.

[0007] Specifically, a plurality of lead-out holes located on the same straight line are provided in the middle of the first glass layer. The lead-out holes are arranged opposite to the end positions of the busbars, and two lead-out ends of adjacent busbars pass through the lead-out holes.

[0008] Specifically, the battery cell group includes a plurality of battery cells arranged in multiple columns, and the battery cells in each column are sequentially connected through interconnection bars to form a battery string.

[0009] Specifically, every two columns of battery strings in the battery cell group form a group, and the interconnection bars at the ends of each group of battery strings are connected by first bus bars.

[0010] Specifically, the interconnecting bar in the middle of the battery string in the first column is connected to the second bus bar, the interconnecting bar in the middle of the battery string in the last column is connected to the third bus bar, and the interconnecting bars in the middle of every two columns of battery strings between the battery string in the first column and the battery string in the last column are connected through the fourth bus bar.

[0011] Specifically, the lead-out holes include a first lead-out hole, a second lead-out hole and a third lead-out hole; the lead-out end of the second bus bar and the lead-out end of the fourth bus bar respectively pass through the first lead-out hole and are connected to the junction box; the lead-out end of one fourth bus bar and the lead-out end of another fourth bus bar respectively pass through the second lead-out hole and are connected to the junction box; the lead-out end of the third bus bar and the lead-out end of the fourth bus bar respectively pass through the third lead-out hole and are connected to the junction box.

[0012] Specifically, the first adhesive film layer and the second adhesive film layer are both EVA transparent adhesive film layers.

[0013] Specifically, the melting point of the filling glue is higher than the temperature at which the photovoltaic modules are subjected to lamination heating treatment.

[0014] Compared with the existing technology, the beneficial effects of the photovoltaic module of the utility model are mainly reflected in:

[0015] A lead-out hole is opened on the first glass layer, and the lead-out end of the busbar passes through the lead-out hole. A filling glue is arranged in the lead-out hole, and the filling glue fills the lead-out hole and seals the hole wall and the circumference of the lead-out end, so that when the photovoltaic module is subjected to vacuum treatment and lamination and heating treatment, the airflow is prevented from impacting the lead-out hole, and the photovoltaic module is effectively prevented from being compressed and cracking at the lead-out hole position; the cured filling glue effectively seals the hole wall and the circumference of the lead-out end of the lead-out hole, avoids the generation of glue film bubbles and glue film overflow in the lead-out hole, and improves the reliability and yield of the photovoltaic module. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A schematic diagram of disassembly of a photovoltaic module provided in an embodiment of the present application;

[0017] Figure 2 A schematic diagram of the internal structure of a battery pack provided in an embodiment of the present application;

[0018] Figure 3 A circuit diagram of a battery pack provided in an embodiment of the present application;

[0019] Figure 4A schematic cross-sectional view of the lead-out terminal and the filling glue provided in an embodiment of the present application;

[0020] Figure 5 Schematic diagram of the photovoltaic module and the glue filling device provided in the embodiment of the present application.

[0021] Reference numerals:

[0022] First glass layer 1, first lead-out hole 11, second lead-out hole 12, third lead-out hole 13, filling glue 14;

[0023] First adhesive film layer 2;

[0024] Cell group 3, cell 31, first cell string 311, second cell string 312, third cell string 313, fourth cell string 314, fifth cell string 315, sixth cell string 316, interconnect bar 32, lead-out terminal 33, first bus bar 34, second bus bar 35, third bus bar 36, fourth bus bar 37;

[0025] Second adhesive film layer 4;

[0026] Second glass layer 5;

[0027] Glue filling device 6. DETAILED DESCRIPTION

[0028] In order to make the technical solutions and advantages of the embodiments of the present application more clearly understood, the exemplary embodiments of the present application are further described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present application, and are not an exhaustive list of all the embodiments. It should be noted that the embodiments and features in the embodiments of the present application can be combined with each other unless they conflict.

[0029] Example 1

[0030] This embodiment provides a photovoltaic module whose manufacturing process includes a laminator step. Upon entering the laminator, the photovoltaic module undergoes vacuuming and laminating heat treatment. Because the photovoltaic module's glass is provided with lead holes, these locations are susceptible to cracking, bubbles, and glue overflow and wrapping around the lead wires during vacuuming and laminating heat treatment. This embodiment effectively addresses these issues by performing a glue filling and curing process at the lead holes.

[0031] The vacuuming and laminating and heating processes are common processes in the manufacture of photovoltaic modules and will not be described in detail here. The curing of the glue filling at the lead-out hole is a process preceding the vacuuming and laminating and heating processes.

[0032] Figure 1 A schematic diagram of disassembly of a photovoltaic module provided in an embodiment of the present application; Figure 2A schematic diagram of the internal structure of a battery pack provided in an embodiment of the present application; Figure 3 A circuit diagram of a battery pack provided in an embodiment of the present application; Figure 4 A schematic cross-sectional view of the lead-out terminal and the filling glue provided in an embodiment of the present application; Figure 5 Schematic diagram of the photovoltaic module and the glue filling device provided in the embodiment of the present application.

[0033] like Figure 1-Figure 5 As shown, this embodiment provides a photovoltaic module, including a first glass layer 1, a first film layer 2, a battery cell group 3, a second film layer 4, and a second glass layer 5 connected in sequence; the battery cell group 3 includes a plurality of battery cells 31 arranged in multiple columns, and each column of battery cells 31 is sequentially connected through an interconnection bar 32 to form a battery string, and the interconnection bars 32 of the battery strings of adjacent columns or a single column of battery strings are connected with a bus bar, and the end of the bus bar is provided with a lead-out terminal 33, and a plurality of lead-out holes are opened on the first glass layer 1, and the lead-out terminal 33 passes through the lead-out hole, and a filling glue 14 is provided in the lead-out hole, and the filling glue 14 fills the lead-out hole and seals its hole wall and the circumference of the lead-out terminal 33.

[0034] The first glass layer 1 provided in this embodiment serves as the back glass of the photovoltaic module, and the second glass layer 5 serves as the front glass of the photovoltaic module. The first and second adhesive film layers 2 and 4 may be transparent ethylene-vinyl acetate copolymer (EVA) adhesive films, which exhibit excellent light transmittance, adhesion, and aging resistance. They can melt at high temperatures and tightly bond to the cell 31 and glass, forming a hard encapsulation layer upon curing.

[0035] The busbar is provided with a lead-out terminal 33 at the end thereof, which is connected to the junction box via a welding lead. The lead-out terminal 33 is stably positioned in the lead-out hole by the curing effect of the filling glue 14, thereby improving the connection accuracy between the lead-out terminal 33 and the junction box.

[0036] The busbar and lead-out terminal 33 are arranged perpendicularly relative to each other, and the lead-out terminal 33 is spaced apart from the wall of the lead-out hole. The filler 14 is made of a high-temperature resistant material with a melting point higher than the lamination heat treatment temperature of the photovoltaic module. After curing, the filler 14 will not melt again during the laminator process, remaining in a solid state and sealing the lead-out hole. The shear strength of the filler 14 is ≥1.5 MPa, and the elongation at break of the filler 14 is ≥250%.

[0037] In this embodiment, the diameter of the lead-out hole is 9-11 mm, which allows the lead-out ends 33 of adjacent busbars to pass through the spacing space and avoids insulation risks caused by exposed battery cells 31; the axial distance of the lead-out hole is 2-3 mm, which is consistent with the thickness of the first glass layer 1; the filling glue 14 fills the hole wall of the lead-out hole to seal it, and the filling depth of the filling glue 14 in the lead-out hole is no greater than the axial distance of the lead-out hole and no less than half the axial distance of the lead-out hole.

[0038] The middle of the first glass layer 1 is provided with a plurality of lead holes located on the same straight line. The lead holes are arranged relative to the end positions of the bus bars in the battery cell group 3. The two lead ends 33 of the adjacent bus bars pass through the lead holes, and the two lead ends 33 are electrically connected to the junction box respectively.

[0039] In this embodiment, the filler 14 is filled by a filler device 6, which includes a drive bracket and a plurality of automatic filler needles mounted on the drive bracket. The automatic filler needles adjust the amount of filler each time to meet the fill requirements of the lead-out hole. The automatic filler needles are then moved to align with the lead-out hole, completing the automated filler operation. The automatic filler needles are conventional structures and will not be described in detail here. After the filler 14 in the lead-out hole solidifies, the photovoltaic module can proceed to the subsequent vacuuming and lamination heating processes.

[0040] In this embodiment, a lead-out hole is provided on the first glass layer 1, and the lead-out end 33 of the busbar passes through the lead-out hole. A filling glue 14 is provided in the lead-out hole. The filling glue 14 fills the lead-out hole and seals the hole wall and the circumference of the lead-out end 33, so that when the photovoltaic module is subjected to vacuum treatment and lamination and heating treatment, the airflow is prevented from impacting the lead-out hole, and the photovoltaic module is effectively prevented from being compressed and cracking at the position of the lead-out hole; the cured filling glue 14 effectively seals the hole wall and the circumference of the lead-out end 33 of the lead-out hole, avoiding the generation of film bubbles and film overflow in the lead-out hole, thereby improving the reliability and yield rate of the photovoltaic module.

[0041] Example 2

[0042] This embodiment optimizes the photovoltaic module based on the above embodiment, and in particular provides a specific implementation method of a cell group:

[0043] The above-mentioned battery cell group 3 includes a plurality of battery cells 31 arranged in multiple columns. Each column of battery cells 31 is connected in sequence through interconnection bars 32 to form a battery string. There is a spacing space between adjacent battery strings. The interconnection bars 32 in the spacing space are connected by bus bars, and the ends of the bus bars are provided with lead-out terminals 33.

[0044] Figure 2 A schematic diagram of the internal structure of a battery pack provided in an embodiment of the present application; Figure 3 A circuit diagram of a battery pack provided in an embodiment of the present application.

[0045] like Figure 2 、 Figure 3As shown, in this embodiment, the battery cell group 3 includes six battery strings, and each two columns of battery strings form a group. The interconnection bars 32 at the ends of each group of battery strings are connected by a first bus bar 34 respectively, the interconnection bar 32 in the middle of the battery string in the first column is connected to the second bus bar 35, the interconnection bar 32 in the middle of the battery string in the last column is connected to the third bus bar 36, and the interconnection bars 32 in the middle of every two columns of battery strings between the battery string in the first column and the battery string in the last column are connected by a fourth bus bar 37.

[0046] Specifically, the battery cell group 3 includes a first battery string 311, a second battery string 312, a third battery string 313, a fourth battery string 314, a fifth battery string 315, and a sixth battery string 316. The first battery string 311 is located at the front row, and the sixth battery string 316 is located at the back row. The interconnection bars 32 at both ends of the first battery string 311 and the second battery string 312 are connected by a first bus bar 34. The interconnection bars 32 at both ends of the third battery string 313 and the fourth battery string 314 are connected by a first bus bar 34. The interconnection bars 32 at both ends of the fifth battery string 315 and the sixth battery string 316 are connected by a first bus bar 34. The interconnecting bar 32 in the middle of the first battery string 311 is connected to the second bus bar 35, the interconnecting bar 32 in the middle of the sixth battery string 316 is connected to the third bus bar 36, the interconnecting bars 32 in the middle of the second battery string 312 and the third battery string 313 are connected through the fourth bus bar 37, and the interconnecting bars 32 in the middle of the fourth battery string 314 and the fifth battery string 315 are connected through the fourth bus bar 37.

[0047] Several lead-out holes are provided in the first glass layer 1, specifically a first lead-out hole 11, a second lead-out hole 12 and a third lead-out hole 13; the lead-out end 33 of the second bus bar 35 is arranged opposite to the lead-out end 33 of the fourth bus bar 37, and respectively passes through the first lead-out hole 11 and is connected to the junction box; the lead-out end 33 of one fourth bus bar 37 is arranged opposite to the lead-out end 33 of another fourth bus bar 37, and respectively passes through the second lead-out hole 12 and is connected to the junction box; the lead-out end 33 of the third bus bar 36 is arranged opposite to the lead-out end 33 of the fourth bus bar 37, and respectively passes through the third lead-out hole 13 and is connected to the junction box.

[0048] The array arrangement of the battery cell group 3 enables the battery cell group 3 to have a larger output power, and can achieve better performance of the battery cell group 3.

[0049] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.

[0050] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of the technical features indicated. Thus, a feature specified as "first" or "second" may explicitly or implicitly include one or more of the features. Throughout the description of this application, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0051] In this application, unless otherwise expressly specified or limited, terms such as "mounted," "connected," "connect," and "fixed" should be understood broadly. For example, they may refer to fixed connections, detachable connections, or integration; mechanical connections, electrical connections, or communication; direct connections or indirect connections through an intermediate medium; and internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of these terms in this application based on specific circumstances.

[0052] Although the preferred embodiments of the present application have been described, those skilled in the art may make additional changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present application.

[0053] Obviously, those skilled in the art may make various changes and modifications to this application without departing from the spirit and scope of this application. Thus, if these modifications and variations of this application fall within the scope of the claims of this application and their equivalents, this application is intended to include these modifications and variations.

Claims

1. A photovoltaic module comprising a first glass layer, a first adhesive film layer, a battery cell group, a second adhesive film layer, and a second glass layer connected in sequence, characterized in that: The battery cell group includes a bus bar, the end of the bus bar is provided with a lead-out terminal, a lead-out hole is opened on the first glass layer, the lead-out terminal passes through the lead-out hole, the lead-out hole is filled with a filling glue, and the filling glue seals the hole wall of the lead-out hole and the circumference of the lead-out terminal.

2. The photovoltaic module according to claim 1, characterized in that: The bus bar and the lead-out end are arranged vertically relative to each other, and the lead-out end is spaced apart from the hole wall of the lead-out hole.

3. The photovoltaic module according to claim 1, wherein: The filling depth of the filling glue in the lead-out hole is not greater than the axial distance of the lead-out hole, and is not less than half of the axial distance of the lead-out hole.

4. The photovoltaic module according to claim 1, wherein: A plurality of lead-out holes are provided in the middle of the first glass layer. The plurality of lead-out holes are located on the same straight line. The lead-out holes are arranged opposite to the end positions of the busbars, and two lead-out ends of adjacent busbars pass through the lead-out holes.

5. The photovoltaic module according to claim 1, characterized in that: The battery cell group includes a plurality of battery cells arranged in multiple columns, and the battery cells in each column are sequentially connected through interconnection bars to form a battery string.

6. The photovoltaic module according to claim 5, characterized in that: Every two columns of battery strings in the battery cell group form a group, and the interconnection bars at the ends of each group of battery strings are connected by a first bus bar.

7. The photovoltaic module according to claim 5, characterized in that: The interconnecting bar in the middle of the battery string located in the first column is connected to the second bus bar, the interconnecting bar in the middle of the battery string located in the last column is connected to the third bus bar, and the interconnecting bars in the middle of every two battery strings between the battery string located in the first column and the battery string located in the last column are connected through the fourth bus bar.

8. The photovoltaic module according to claim 7, characterized in that: The lead-out holes include a first lead-out hole, a second lead-out hole and a third lead-out hole; the lead-out end of the second bus bar and the lead-out end of the fourth bus bar respectively pass through the first lead-out hole and are connected to the junction box; the lead-out end of one fourth bus bar and the lead-out end of another fourth bus bar respectively pass through the second lead-out hole and are connected to the junction box; the lead-out end of the third bus bar and the lead-out end of the fourth bus bar respectively pass through the third lead-out hole and are connected to the junction box.

9. The photovoltaic module according to claim 1, characterized in that: The first adhesive film layer and the second adhesive film layer are both EVA transparent adhesive film layers.

10. The photovoltaic module according to claim 1, characterized in that: The melting point of the filling glue is higher than the temperature at which the photovoltaic modules are subjected to lamination heating treatment.

Images