High-density packaging photovoltaic module structure

Abstract

The utility model belongs to the technical field of photovoltaic cell power generation, and particularly relates to a high-density packaging photovoltaic assembly structure, which comprises a photovoltaic front plate and a photovoltaic back plate, a cell string group, an isolation assembly and a bus bar are sequentially packaged between the photovoltaic front plate and the photovoltaic back plate, and frames are arranged on the outer sides of the photovoltaic front plate and the photovoltaic back plate. The bus bar of the high-density packaging photovoltaic assembly is located between the isolation assembly and the photovoltaic backboard, the bus bar is prevented from occupying the laying space of the battery string groups, the space saved by the bus bar is reused, more battery string groups are placed, high-density packaging is achieved, and the service life of the photovoltaic assembly is prolonged under the condition that the electrical distance of the photovoltaic assembly is met. The power of the module can be improved, and a better appearance can be brought.

Description

TECHNICAL FIELD

[0001] The utility model belongs to photovoltaic cell power generation technical field especially relates to a high density package photovoltaic module structure. BACKGROUND

[0002] In conventional photovoltaic module packaging, the head, middle and tail bus bars that converge the current of the battery string are located at the edge area of the battery sheet, occupying the internal space of the module and causing partial space waste. At the same time, there is a sheet spacing between the battery sheets, occupying part of the space of the module, and the space utilization rate is not high. In addition, there is a difference in consistency between the color of the bus bar and the color of the battery sheet, and the appearance is not beautiful, especially for BAPV or BIPV products with high appearance requirements.

[0003] For example, patent application No. CN202110615968.5 photovoltaic module packaging device, including front glass, back glass, side glass and a plurality of baffle, front glass and back glass pass through side glass connection, a plurality of baffles are evenly spaced and fixed on the front glass, the gap formed by adjacent baffles and the gap formed by the baffle and the side glass are the accommodation space of the battery string, a plurality of holes are provided on the back glass for the bus bar to pass through, one end of the bus bar is connected with the battery string, and the other end of the bus bar is welded with the terminal box; by setting front glass, back glass, side glass, a plurality of baffles and terminal box and other structures, a novel packaging device for photovoltaic module is provided, but the disadvantage of this technical scheme is that the bus bar is located at the edge area of the battery sheet, occupying the internal space of the module and causing partial space waste. SUMMARY

[0004] The utility model aims at providing a high density package photovoltaic module structure to solve the problems in the prior art, and the specific technical scheme is as follows:

[0005] A high density package photovoltaic module structure, comprising a photovoltaic front plate and a photovoltaic back plate, a battery string group, an isolation component and a bus bar are sequentially packaged between the photovoltaic front plate and the photovoltaic back plate, and a frame is arranged on the outer side of the photovoltaic front plate and the photovoltaic back plate.

[0006] Further, a front plate packaging adhesive film is arranged between the photovoltaic front plate and the battery string group, and a back plate packaging adhesive film is arranged between the bus bar and the photovoltaic back plate.

[0007] Further, the isolation component comprises a head edge isolation strip and a tail edge isolation strip, the head edge isolation strip and the tail edge isolation strip are arranged at the tail of the battery string group respectively, a head bus bar adhesive film pad strip and a tail bus bar adhesive film pad strip are packaged on the head edge isolation strip and the tail edge isolation strip respectively, and a head bus bar isolation strip and a tail bus bar isolation strip are packaged on the head bus bar adhesive film pad strip and the tail bus bar adhesive film pad strip respectively.

[0008] Further, the bus bar includes a head bus bar and a tail bus bar, and the head bus bar and the tail bus bar are respectively encapsulated on a head bus bar isolation strip and a tail bus bar isolation strip.

[0009] Further, the head bus bar and the tail bus bar are adhered to a photovoltaic back plate through a back plate encapsulation adhesive film.

[0010] Further, the battery string group includes a plurality of battery pieces, and adjacent two battery pieces are partially overlapped and welded and fixed through a welding strip, and the adjacent two battery pieces are electrically connected through the welding strip.

[0011] Further, the overlapped part of the adjacent two battery pieces has a width of 0.5-3 mm.

[0012] Further, the welding strip at the overlapped part between the adjacent two battery pieces is flattened, and the thickness of the flattened welding strip is 0.07-0.2 mm.

[0013] Further, the head edge isolation strip and the tail edge isolation strip are respectively located below the welding strip at two ends of the battery piece, and the head bus bar adhesive film pad strip, the head bus bar isolation strip and the head bus bar edge are wrapped in the head bus bar after the welding strip at one end of the battery piece is bent, and the tail bus bar adhesive film pad strip, the tail bus bar isolation strip and the tail bus bar edge are wrapped in the tail bus bar after the welding strip at the other end of the battery piece is bent.

[0014] Further, the battery piece has a thickness of 180-220 mu m, and the battery piece has a thickness of 1 / 3-1 / 8 of the battery piece.

[0015] The utility model discloses the advantages are:

[0016] 1. Compared with the conventional photovoltaic module, the bus bar of the high-density encapsulation photovoltaic module is located between the isolation assembly and the photovoltaic back plate, which avoids occupying the space of the battery string group, saves the space of the bus bar under the condition of meeting the electrical distance of the photovoltaic module, and puts more battery string groups, realizes high-density encapsulation, improves the power of the module, and also brings better appearance.

[0017] 2. The battery piece and the battery piece are stacked by the high-density encapsulation battery piece stacking process, which can maximize the space utilization of the module and maximize the output of the module power under the condition of the same module size.

[0018] 3. The high-density encapsulation battery piece can be stacked and welded in a smaller size (1 / 3-1 / 8 piece), which has lower module series resistance and higher power gain compared with the conventional 1 / 2 piece welding, and the smaller size of the battery piece has smaller heating area and better anti-hot spot effect, which brings better value to the whole module operation cycle. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 It is the whole structure schematic view of the utility model;

[0020] Figure 2 It is Figure 1 The partial enlarged view of A in the middle;

[0021] Figure 3 It is the whole laminated laying circuit diagram of the utility model;

[0022] Figure 4 It is Figure 3 The partial enlarged view of B in the middle;

[0023] Figure 5 It is the battery piece structure schematic view of the utility model;

[0024] Figure 6 It is the isolation assembly, busbar and solder strip arrangement structure schematic view;

[0025] Figure 7 It is the whole laminated laying circuit diagram of the utility model;

[0026] Marking in the drawing is explained:

[0027] Photovoltaic front plate 1;Front plate encapsulation adhesive film 2;Battery string group 3;Head edge isolation strip 4;Tail edge isolation strip 5;Head busbar adhesive film pad strip 6;Head busbar adhesive film pad strip 7;Head busbar isolation strip 8;Tail busbar isolation strip 9;Head busbar 10;Tail busbar 11;Back plate encapsulation adhesive film 12;Photovoltaic back plate 13;Frame 14;Battery piece 15;Solder strip 16;Battery piece overlap 17. Specific implementation

[0028] The technical scheme of the utility model will be described clearly and completely in combination with the drawings, obviously, the described embodiment is a part of the embodiment of the utility model, not all the embodiment. Based on the embodiment in the utility model, all other embodiments obtained by the person skilled in the art without making creative labor belong to the scope of protection of the utility model.

[0029] In the description of the utility model, it needs to be explained that the orientation or position relation indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like is the orientation or position relation based on the drawing shown, only for the convenience of describing the utility model and simplifying the description, and not indicating or implying that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, therefore, it cannot be understood as the limitation of the utility model. In addition, the terms "first", "second", "third" are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0030] Example 1

[0031] like Figures 1-7 As shown, a high-density encapsulated photovoltaic module structure includes a photovoltaic front panel 1 and a photovoltaic back panel 13. A battery string group 3, an isolation component and a busbar are sequentially encapsulated between the photovoltaic front panel 1 and the photovoltaic back panel 13. A frame 14 is provided on the outer side of the photovoltaic front panel 1 and the photovoltaic back panel 13.

[0032] The working principle of the above technical solution: The photovoltaic front panel 1 can be made of conventional glass materials, such as high-transmittance patterned glass, float glass and curtain wall glass, with a thickness of 1.6 to 5.0 mm. The light transmittance is consistent with that of conventional photovoltaic modules, between 92% and 94%.

[0033] The photovoltaic front panel 1 can also use composite glass materials, such as high-transmittance films, such as ETFE, FVDF, etc., with a thickness of 0.05 to 0.5 mm, and the light transmittance is consistent with that of conventional photovoltaic modules, between 92% and 94%.

[0034] The photovoltaic front panel 1 can also be made of photovoltaic composite transparent materials, such as PET;

[0035] The photovoltaic backsheet 13 is consistent with the backsheet material of conventional photovoltaic modules. It can be made of conventional glass materials, such as high-transparency patterned glass, float glass and curtain wall glass, or composite glass materials, such as PET.

[0036] After the photovoltaic front panel 1, the battery string group 3, the isolation component, the bus bar and the photovoltaic back panel 13 are stacked and assembled, the frame 14 is installed on the outside of the photovoltaic front panel 1 and the photovoltaic back panel 13, thereby completing the encapsulation of the high-density photovoltaic module.

[0037] Compared to conventional photovoltaic modules, the busbar of this high-density encapsulated photovoltaic module is located between the isolation module and the photovoltaic backsheet 13, avoiding the busbar occupying the space for laying the battery string group 3. While meeting the electrical distance requirements of the photovoltaic module, the space saved by the busbar can be reused to accommodate more battery string groups 3, achieving high-density encapsulation. This not only improves the module power but also brings a better appearance.

[0038] Example 2

[0039] like Figures 1-7 As shown, a front panel encapsulation film 2 is provided between the photovoltaic front panel 1 and the battery string group 3, and a back panel encapsulation film 12 is provided between the busbar and the photovoltaic back panel 13.

[0040] The working principle of the above technical solution is as follows: the function of the front panel encapsulation film 2 is to encapsulate the photovoltaic front panel 1 and the battery string group 3, and the function of the back panel encapsulation film 12 is to encapsulate the busbar and the photovoltaic back panel 13. The front panel encapsulation film 2 and the back panel encapsulation film 12 are made of the same material, such as EVA, EPE, POE, etc.

[0041] Example 3

[0042] like Figures 1-7 As shown, the isolation assembly includes a head edge isolation strip 4 and a tail edge isolation strip 5, which are respectively disposed at the tail and tail of the battery string 3. A head busbar adhesive film pad 6 and a tail busbar adhesive film pad 7 are respectively encapsulated on the head edge isolation strip 4 and the tail edge isolation strip 5. A head busbar isolation strip 8 and a tail busbar isolation strip 9 are respectively encapsulated on the head busbar adhesive film pad 6 and the tail busbar adhesive film pad 7.

[0043] The working principle of the above technical solution is as follows: The function of the head busbar adhesive film pad 6 is to bond the head busbar separator 8 to the battery string 3, and the function of the tail busbar adhesive film pad 7 is to bond the tail busbar separator 9 to the battery string 3. The head busbar adhesive film pad 6 and the tail busbar adhesive film pad 7 are made of the same material as the front panel encapsulation film 2. The head busbar separator 8 and the tail busbar separator 9 serve as insulation.

[0044] Example 4

[0045] like Figures 1-7 As shown, the busbar includes a head busbar 10 and a tail busbar 11, which are respectively encapsulated on a head busbar isolation strip 8 and a tail busbar isolation strip 9.

[0046] Both the head busbar 10 and the tail busbar 11 are attached to the photovoltaic backsheet 13 via a backsheet encapsulation film 12;

[0047] The working principle of the above technical solution is as follows: The head busbar 10 and the tail busbar 11 serve to connect multiple battery cells 15 in series for current output within the battery string 3. Through the welding process, the bent and returned welding strip 16 is welded onto the head busbar 10 and the tail busbar 11, ultimately realizing the current output of the battery string 3.

[0048] Example 5

[0049] like Figures 1-7 As shown, the battery string group 3 includes multiple battery cells 15, with some overlap between two adjacent battery cells 15, and they are fixed by welding with solder strips 16. Two adjacent battery cells 15 are electrically connected by solder strips 16.

[0050] The width of the overlapping part between two adjacent battery pieces 15 is between 0.5mm and 3mm;

[0051] The working principle of the above technical solution is that the lamination process is adopted, the battery pieces 15 are connected in series by the welding strip 16, the welding strip 16 and the battery piece 15 are welded and fixed by the welding process, and the positive and negative electrodes of the battery piece 15 are connected through.

[0052] The head of a battery piece is overlapped on the front of the tail of the previous battery piece, and the positive and negative electrodes are connected by the welding strip. The overlapping distance between the front and rear battery pieces is usually 0.5-3mm, and the setting plays a role in increasing the utilization rate of the component space.

[0053] Example six

[0054] As shown in Figures 1-7 The welding strip 16 at the overlapping part 17 between the two adjacent battery pieces 15 is flattened, and the thickness after flattening is between 0.07mm and 0.2mm.

[0055] The working principle of the above technical solution is that the welding strip 16 adopts a high-conductivity photovoltaic welding strip, which plays a role in connecting the positive and negative electrodes of the front and rear battery pieces 15 and fixing the welding. The welding strip 16 at the overlapping part 17 between the two adjacent battery pieces 15 is flattened, and the thickness after flattening is between 0.07mm and 0.2mm, which can increase the area of the battery piece and reduce the pre-stress of the welding strip at the overlapping part to damage the battery piece.

[0056] Example seven

[0057] As shown in Figures 1-7 The head edge isolation strip 4 and the tail edge isolation strip 5 are located below the welding strip 16 at both ends of the battery piece 15, respectively. After the welding strip 16 at one end of the battery piece 15 is bent, the head busbar adhesive film pad strip 6, the head busbar isolation strip 8 and the edge of the head busbar 10 are wrapped inside. After the welding strip 16 at the other end of the battery piece 15 is bent, the tail busbar adhesive film pad strip 7, the tail busbar isolation strip 9 and the edge of the tail busbar 11 are wrapped inside.

[0058] The working principle of the above technical solution is that the head edge isolation strip 4 and the tail edge isolation strip 5 are located below the welding strip 16 at both ends of the battery piece 15, respectively. From one side of the photovoltaic front plate 1, the welding strip 16 at both ends of the welding strip 16 at both ends of the battery piece 15 is blocked by the head edge isolation strip 4 and the tail edge isolation strip 5. What is seen is the head edge isolation strip 4 and the tail edge isolation strip 5 and the front plate encapsulation adhesive film 2 seen through the photovoltaic front plate 1. The above three are consistent in color, which improves the overall appearance.

[0059] Example eight

[0060] As shown in Figures 1-7As shown, the battery piece 15 is 1 / 3-1 / 8 thickness of the battery piece with thickness of 180-220 μm;

[0061] The working principle of the technical scheme is as follows: the battery piece 15 provides a power generation main body for the photovoltaic module, and the 1 / 3-1 / 8 thickness of the conventional battery piece is used for lamination welding, the thickness of the conventional battery piece is between 180 μm and 220 μm, compared with the 1 / 2 piece welding of the conventional battery piece, the module has lower series resistance, higher power gain, smaller heating area of the smaller specification battery piece, better anti-hot spot effect, and better value for the operation cycle of the whole module.

[0062] It can be understood that the utility model is described through some embodiments, and the person skilled in the art knows that various changes or equivalent replacements can be made to these features and embodiments without departing from the spirit and scope of the utility model. In addition, under the guidance of the utility model, these features and embodiments can be modified to adapt to specific conditions and materials without departing from the spirit and scope of the utility model. Therefore, the utility model is not limited by the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of the present application belong to the scope protected by the utility model.

Claims

1. A high-density encapsulated photovoltaic module structure, characterized in that, It includes a photovoltaic front panel (1) and a photovoltaic back panel (13). A battery string (3), an isolation component and a busbar are sequentially encapsulated between the photovoltaic front panel (1) and the photovoltaic back panel (13). A frame (14) is provided on the outside of the photovoltaic front panel (1) and the photovoltaic back panel (13).

2. The high-density encapsulated photovoltaic module structure according to claim 1, characterized in that, A front panel encapsulation film (2) is provided between the photovoltaic front panel (1) and the battery string (3), and a back panel encapsulation film (12) is provided between the busbar and the photovoltaic back panel (13).

3. The high-density encapsulated photovoltaic module structure according to claim 2, characterized in that, The isolation assembly includes a head edge isolation strip (4) and a tail edge isolation strip (5), which are respectively disposed at the tail and tail of the battery string (3). A head busbar adhesive film pad (6) and a tail busbar adhesive film pad (7) are respectively encapsulated on the head edge isolation strip (4) and the tail edge isolation strip (5). A head busbar isolation strip (8) and a tail busbar isolation strip (9) are respectively encapsulated on the head busbar adhesive film pad (6) and the tail busbar adhesive film pad (7).

4. The high-density encapsulated photovoltaic module structure according to claim 3, characterized in that, The busbar includes a head busbar (10) and a tail busbar (11), which are respectively encapsulated on a head busbar isolation strip (8) and a tail busbar isolation strip (9).

5. The high-density encapsulated photovoltaic module structure according to claim 4, characterized in that, Both the head busbar (10) and the tail busbar (11) are bonded to the photovoltaic backsheet (13) through a backsheet encapsulation film (12).

6. The high-density encapsulated photovoltaic module structure according to claim 5, characterized in that, The battery string (3) includes multiple battery cells (15), with some overlap between two adjacent battery cells (15), and they are fixed by welding with solder strips (16). Two adjacent battery cells (15) are electrically connected by solder strips (16).

7. A high-density encapsulated photovoltaic module structure according to claim 6, characterized in that, The width of the overlapping portion of two adjacent battery cells (15) is between 0.5 and 3 mm.

8. The high-density encapsulated photovoltaic module structure according to claim 7, characterized in that, The solder strip (16) at the overlap (17) between two adjacent battery cells (15) is flattened, and the thickness after flattening is between 0.07 and 0.2 mm.

9. A high-density encapsulated photovoltaic module structure according to claim 8, characterized in that, The head edge isolation strip (4) and the tail edge isolation strip (5) are located below the welding strips (16) at both ends of the battery cell (15). After the welding strip (16) at one end of the battery cell (15) is bent, it wraps the edges of the head busbar adhesive film pad (6), the head busbar isolation strip (8) and the head busbar (10). After the welding strip (16) at the other end of the battery cell (15) is bent, it wraps the edges of the tail busbar adhesive film pad (7), the tail busbar isolation strip (9) and the tail busbar (11).

10. A high-density encapsulated photovoltaic module structure according to claim 9, characterized in that, The battery cell (15) has a thickness of 1 / 3 to 1 / 8 of that of a battery cell with a thickness of 180μm to 220μm.

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