Battery piece assembly and main-grid-free photovoltaic panel

Abstract

The utility model relates to the technical field of photovoltaic cells, in particular to a cell piece assembly and a photovoltaic panel without a main grid, the cell piece assembly comprises a cell piece I and a cell piece II, a gap is formed between the cell piece I and the cell piece II, the cell piece I is provided with a first front face and a first back face, and the cell piece II is provided with a second front face and a second back face. The second battery piece is provided with a second front face and a second back face, a first welding strip is arranged on the first back face, a second welding strip is arranged on the second front face, the first welding strip and the second welding strip are connected through a transition welding strip, and the transition welding strip is arranged at the position of the gap. A first adhesive film is arranged on the surface of the first welding strip, and a second adhesive film is arranged on the surface of the second welding strip; according to the utility model, the distance between the adjacent battery pieces is reduced to form a gap, so that more battery pieces can be packaged in a component with the same area, thereby greatly improving the photoelectric conversion efficiency and the actual power generation power of the component in a unit component area.

Description

Technical Field

[0001] The utility model relates to the technical field of photovoltaic cells, and in particular to a cell assembly and a main grid-free photovoltaic panel. Background Art

[0002] At present, photovoltaic cell technology is being updated at an increasingly rapid pace, and the market's requirements for photovoltaic cell performance are becoming increasingly stringent. At the same time, manufacturing costs are also decreasing year by year. At present, the busbar-less photovoltaic panel battery process technology has become the main focus of photovoltaic researchers. The difference between this battery and the traditional battery is that: the busbar-less photovoltaic panel battery only has secondary grids laid on the front and back surfaces. Its busbar-less design leaves only (or no) a few reserved points for welding. Since the silver paste used for printing the grid lines accounts for 30% to 40% of the total battery manufacturing cost, and the silver paste for printing the busbar accounts for a large proportion of the silver paste consumption, if the busbar design is removed, the silver paste cost will be reduced by 40% to 60%. Therefore, the busbar-less photovoltaic panel battery manufacturing technology conforms to the trend of technological change, and battery string welding is one of the difficulties.

[0003] In order to string together independent battery cells to form a battery pack, the traditional method is to lay a soldering ribbon soaked in flux on the main grid on the surface of the battery, and then use high temperature to melt the soldering ribbon to weld the soldering ribbon to the battery cell. However, there are no main grid lines on the surface of the busbarless battery, so the welding process cannot be carried out.

[0004] Therefore, it is necessary to provide a busbar-free low-temperature interconnected cell assembly and a busbar-free photovoltaic panel. Utility Model Content

[0005] The utility model provides a cell chip assembly and a main grid-free photovoltaic panel to solve the above technical problems.

[0006] In order to achieve the above-mentioned purpose, an embodiment of the present invention provides a battery cell assembly, including: battery cell one and battery cell two, a gap is formed between battery cell one and battery cell two, battery cell one has a first front side and a first back side, battery cell two has a second front side and a second back side, a first welding strip is provided on the first back side, a second welding strip is provided on the second front side, the first welding strip and the second welding strip are connected by a transition welding strip, the transition welding strip is provided at the gap position, a first adhesive film is provided on the surface of the first welding strip, and a second adhesive film is provided on the surface of the second welding strip.

[0007] Furthermore, the cross-section of the transition welding strip is elliptical.

[0008] Furthermore, the first adhesive film and the second adhesive film are not less than one layer.

[0009] Furthermore, the first welding strip, the transition welding strip and the second welding strip are integrally provided.

[0010] The utility model also provides a cell assembly and a busbar-less photovoltaic panel, comprising a plurality of cell assemblies as described above.

[0011] Furthermore, the photovoltaic panel also includes a base plate, and the battery cell assembly arranged at equal intervals is arranged on the base plate through a first packaging layer.

[0012] Furthermore, the top surface of the cell assembly is provided with glass via a second packaging layer.

[0013] Furthermore, a frame is provided on the edge of the top surface of the glass.

[0014] Furthermore, the frame includes a pressing portion and a blocking portion, a seal is provided on the bottom surface of the pressing portion, the seal is against the edge of the top surface of the glass, and one side of the blocking portion is against the first packaging layer, the battery cell assembly at the edge position, the second packaging layer, the glass and the side of the bottom plate.

[0015] Furthermore, one side of the enclosure is provided with grooves corresponding to the battery cell assembly, the glass and the bottom plate, and a guard bar is formed between two adjacent grooves. Two arc-shaped protective strips are arranged in the arc-shaped protective strip, and the arc-shaped protective strip has a concave surface and a convex surface. The two convex surfaces correspond to each other, and a plurality of pits are arranged on the convex surface.

[0016] Compared with the prior art, the beneficial effects of the present invention are:

[0017] By reducing the distance between adjacent cells to form gaps, more cells can be packaged in the same area of ​​the module, thereby significantly improving the photovoltaic conversion efficiency and actual power generation per unit area of ​​the module;

[0018] By setting up adhesive film to fix the welding ribbon, the connection can be made by room temperature or low temperature interconnection process, so that heterojunction or perovskite batteries that are more sensitive to temperature can also be applied, thus improving the applicability;

[0019] The flat transition strip is provided to facilitate a more secure attachment of the battery junction end to the strip and reduce the possibility of cracks caused by the stress of the strip.

[0020] By setting a frame, the connection between the layers is enhanced, and the battery cells and the glass sides are effectively protected. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0022] Figure 1This is a front view structural diagram of a battery cell assembly of the present invention;

[0023] Figure 2 This is a side structural diagram of a battery cell assembly of the present invention;

[0024] Figure 3 For this utility model Figure 2 A in the middle is an enlarged structural diagram;

[0025] Figure 4 This is a three-dimensional diagram of a preferred embodiment of a busbar-less photovoltaic panel of the present invention;

[0026] Figure 5 It is a schematic diagram of the partial cross-sectional structure of the frame of the utility model.

[0027] Among them, 1. Battery cell one; 11. First welding ribbon; 12. First adhesive film; 13. First front side; 14. First back side; 2. Battery cell two; 21. Second welding ribbon; 22. Second adhesive film; 23. Second front side; 24. Second back side; 3. Interval; 4. Transition welding ribbon; 5. Bottom plate; 6. First packaging layer; 7. Second packaging layer; 8. Glass; 9. Frame; 91. Holding part; 92. Enclosing part; 93. Seal; 94. Groove; 95. Bar; 96. Arc-shaped protective strip; 97. Pits. DETAILED DESCRIPTION

[0028] The present invention will now be described in further detail with reference to the accompanying drawings, which are simplified schematic diagrams that illustrate the basic structure of the present invention in a schematic manner.

[0029] See also Figure 1 and combined Figures 2 to 3 , Figure 1 This is a front view structural diagram of a battery cell assembly of the present invention; Figure 2 This is a side structural diagram of a battery cell assembly of the present invention; Figure 3 For this utility model Figure 2 The structure diagram at A is enlarged. Figures 1 to 3As shown, at least one embodiment provides a cell assembly comprising: a cell 1 and a cell 2, with a gap 3 formed between cell 1 and cell 2. Cell 1 has a first front side 13 and a first back side 14, while cell 2 has a second front side 23 and a second back side 24. A first welding ribbon 11 is provided on the first back side 14, and a second welding ribbon 21 is provided on the second front side 23. The first welding ribbon 11 and the second welding ribbon 21 are connected by a transition welding ribbon 4, which has an elliptical cross-section. The first welding ribbon 11, transition welding ribbon 4, and second welding ribbon 21 are integrally arranged. That is, between two adjacent cell sheets, a welding ribbon passes from the bottom surface through the gap between them and connects to the top surface of the other cell sheet. This eliminates the spacing between the cell sheets in the related art, allowing the transition welding ribbon 4 to connect at the gap 3. The transition welding ribbon 4 is arranged at the gap 3. The surface of the first welding ribbon 11 is provided with a first adhesive film 12, and the surface of the second welding ribbon 21 is provided with a second adhesive film 22. The first adhesive film 12 and the second adhesive film 22 are not less than one layer. Adhesive films are provided at the locations where solder strips are present on the front and back of the cell. The adhesive films can be used to interconnect and fix the solder strips and the cell at 40-160°C.

[0030] Please continue reading Figure 4 and combined Figure 5 , Figure 4 This is a three-dimensional diagram of a preferred embodiment of a busbar-less photovoltaic panel of the present invention; Figure 5 This is a schematic diagram of the partial cross-sectional structure of the frame of the utility model. Figures 4 and 5 As shown, the present invention also provides a busbar-less photovoltaic panel, comprising the cell assembly described above. The photovoltaic panel further comprises a base plate 5, on which the cell assembly, arranged at equal intervals, is mounted via a first encapsulation layer 6. Glass 8 is provided on the top surface of the cell assembly via a second encapsulation layer 7. A frame 9 is provided along the top edge of glass 8.

[0031] The frame 9 includes a holding portion 91 and a retaining portion 92. The holding portion 91 and the retaining portion 92 not only secure the multiple layers but also protect their sides. Specifically, a seal 93 is provided on the bottom surface of the holding portion 91, which abuts against the top edge of the glass 8. One side of the retaining portion 92 abuts against the side surfaces of the first encapsulation layer 6, the cell assembly at the edge, the second encapsulation layer 7, the glass 8, and the bottom plate 5. A groove 94 is formed on one side of the retaining portion 92, corresponding to the cell assembly, the glass 8, and the bottom plate 5. A retaining bar 95 is formed between two adjacent grooves 94. Two curved protective bars 96 are provided within the curved protective bar 96. The curved protective bars 96 are made of an elastic material. When squeezed, the combined thickness of the curved protective bars 96 and the retaining bars 95 matches the thickness of the adhesive layer. The curved protective bar 96 has a concave surface and a convex surface, with the two convex surfaces corresponding to each other. The convex surface is provided with multiple pits 97, which are used to store adhesive and enhance the connection strength between the frame 9 and the various layers.

[0032] In summary, by reducing the distance between adjacent battery cells to form a gap 3, more battery cells can be packaged in the same area component, thereby greatly improving the photoelectric conversion efficiency and actual power generation power of the component per unit component area; by setting a film to fix the welding strip, it can be connected at room temperature or low temperature interconnection process, and the heterojunction or perovskite battery that is more sensitive to temperature can also be applied, thereby improving the applicability; by setting a flat transition welding strip 4, it is beneficial to make the battery junction end and the welding strip more firmly attached, and reduce the cracks that may be caused by the stress of the welding strip; by setting a frame 9, the connection between the layers is enhanced, and at the same time, the battery cells and the glass side are effectively protected.

[0033] Based on the above-mentioned ideal embodiment of the present invention, and in accordance with the above description, relevant personnel can make various changes and modifications without departing from the technical scope of the present invention. The technical scope of the present invention is not limited to the content of the specification, but must be determined according to the scope of the claims.

Claims

1. A battery cell assembly, characterized in that: include: A battery cell (1) and a battery cell (2), wherein a gap (3) is formed between the battery cell (1) and the battery cell (2), the battery cell (1) having a first front side (13) and a first back side (14), the battery cell (2) having a second front side (23) and a second back side (24), a first welding strip (11) being provided on the first back side (14), a second welding strip (21) being provided on the second front side (23), the first welding strip (11) and the second welding strip (21) being connected via a transition welding strip (4), the transition welding strip (4) being provided at the position of the gap (3), a first adhesive film (12) being provided on the surface of the first welding strip (11), and a second adhesive film (22) being provided on the surface of the second welding strip (21).

2. A battery cell assembly according to claim 1, characterized in that: The cross section of the transition welding strip (4) is elliptical.

3. The battery cell assembly according to claim 1, wherein: The first adhesive film (12) and the second adhesive film (22) are not less than one layer.

4. The battery cell assembly according to claim 1, wherein: The first welding strip (11), the transition welding strip (4) and the second welding strip (21) are integrally arranged.

5. A busbarless photovoltaic panel, characterized by: The invention comprises a plurality of battery cell assemblies according to any one of claims 1 to 4.

6. The busbar-less photovoltaic panel according to claim 5, characterized in that: The photovoltaic panel further comprises a base plate (5), and the cell chip assemblies arranged at equal intervals are arranged on the base plate (5) via a first packaging layer (6).

7. The busbar-less photovoltaic panel according to claim 6, characterized in that: The top surface of the cell assembly is provided with glass (8) via a second packaging layer (7).

8. The busbar-less photovoltaic panel according to claim 7, characterized in that: A frame (9) is provided on the top edge of the glass (8).

9. The busbar-less photovoltaic panel according to claim 8, characterized in that: The frame (9) comprises a holding portion (91) and a blocking portion (92); a seal (93) is provided on the bottom surface of the holding portion (91); the seal (93) abuts against the edge of the top surface of the glass (8); and one side of the blocking portion (92) abuts against the first packaging layer (6), the battery cell assembly at the edge, the second packaging layer (7), the glass (8), and the side surface of the bottom plate (5).

10. The busbar-less photovoltaic panel according to claim 9, characterized in that: A groove (94) corresponding to the cell assembly, the glass (8) and the bottom plate (5) is provided on one side of the enclosure portion (92); a barrier strip (95) is formed between two adjacent grooves (94); two arc-shaped protection strips (96) are provided inside the arc-shaped protection strip (96); the arc-shaped protection strip (96) has a concave surface and a convex surface; the two convex surfaces correspond to each other, and a plurality of pits (97) are provided on the convex surface.

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