Imbricated tile assembly

Abstract

The utility model discloses an imbricate assembly, which comprises a plurality of small battery pieces formed by cutting along a battery piece cutting line, and the small battery pieces are alternately arranged according to the polarity of positive and negative poles and are mutually overlapped into a string; a plurality of main grid lines are respectively arranged on the front surfaces and the back surfaces of the small battery pieces, and a plurality of main grid line welding spots are arranged on the main grid lines; an insulating tape avoiding the position of the electrode is arranged at the position where the front surface of the small battery piece is overlapped with the back surface of the small battery piece; at least one main grid line welding spot on each main grid line is positioned in the insulating tape but is not covered by the insulating tape; a metal conductor is also arranged between the two layers of insulating tapes; low-temperature solder paste is coated in the insulating tape area along the direction of the cutting line; according to the utility model, the insulating tape is printed on the surface of the battery piece in a silk-screen printing manner, the connection of the positive electrode and the negative electrode of the battery piece and the transmission of main grid line current are not influenced while the insulating isolation is ensured, and the small battery pieces are connected by adopting low-temperature solder paste, so that the operation difficulty and the workload during lamination are reduced.

Description

Technical Field

[0001] This utility model relates to the field of photovoltaic cell module technology, specifically to a shingled module. Background Technology

[0002] Shingled solar modules achieve a close arrangement of solar cells by cutting them into small strips and stacking them together flexibly with materials such as conductive adhesives or glues. However, this close arrangement also presents challenges in ensuring insulation between the cells. To ensure insulation between the cells, insulating materials need to be added between them or special insulation designs need to be adopted.

[0003] In existing technologies, overlapping cell sections in shingled modules can be connected using conductive adhesive or glue, but these connections require sufficient insulation spacing. Adding insulating gaskets between cells, typically made of transparent polymer materials, effectively blocks current and ensures insulation between cells. However, in shingled modules, the conductive adhesive or glue used at the overlapping cell sections not only carries the risk of overflow and short circuits, but the high silver content in the paste also increases module costs, hindering mass production.

[0004] Furthermore, commonly used matrix materials for conductive adhesives include epoxy resins, polyurethanes, and phenolic resins. These materials, after curing, form the molecular framework structure of the conductive adhesive, providing assurance of mechanical and adhesive properties. The primary function of conductive adhesives is to provide conductive connections, not insulation; from a design perspective, conductive adhesives do not possess significant insulating properties.

[0005] Furthermore, shingled solar cells are small in size and densely packed, with gaps between the cells typically on the order of millimeters or even smaller. This severely limits the space available for workers' hands and tools during insulation operations. Due to this limited space, it is difficult to ensure even pressure and accurate adhesion for processes requiring the pasting or fixing of insulating materials, such as using insulating adhesives or tapes. Utility Model Content

[0006] The technical problem to be solved by this utility model is to provide a shingled module that can solve the problem that the use of conductive adhesive in the overlapping part of the battery cells cannot guarantee insulation, as well as the problem of difficult stacking operation, thereby reducing the difficulty and workload of stacking.

[0007] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows.

[0008] A shingled module includes a plurality of small battery cells cut along a dicing line. The small battery cells are arranged in alternating positive and negative polarities and are stacked in a string, with the back of one small battery cell overlapping the front of the next small battery cell. A plurality of main grid lines are respectively provided on the front and back of each small battery cell, and a plurality of main grid line solder joints are provided on the main grid lines. An insulating strip is provided at the overlap position between the front and back of the small battery cell, avoiding electrode positions. At least one main grid line solder joint on each main grid line is located within the insulating strip but is not covered by the insulating strip. A metal conductor aligned with the dicing line direction is also provided between the two insulating strips. Low-temperature solder paste is applied to the insulating strip area along the dicing line direction.

[0009] In the aforementioned shingled assembly, the insulating strip is narrow and the corners of the insulating strip are designed with bevels or rounded corners.

[0010] In the aforementioned shingled assembly, the width of the low-temperature solder paste is smaller than the width of the insulating tape.

[0011] In the aforementioned shingled assembly, the low-temperature solder paste is applied intermittently or continuously to the insulating area of ​​the insulating tape, and the low-temperature solder paste is applied to the position where the main grid solder joint contacts the metal conductor.

[0012] In the aforementioned shingled assembly, the metal conductor is copper wire, silver-clad copper wire, solder strip, or silver foil.

[0013] Due to the adoption of the above technical solutions, the technological progress achieved by this utility model is as follows.

[0014] This invention provides a shingled module that uses screen printing to print insulating tape on the surface of the solar cells, avoiding the electrode positions and main grid solder joints. This ensures insulation and does not affect the positive and negative electrode connections of the solar cells or the transmission of current to the main grid lines. Furthermore, by setting a metal conductor as an efficient internal current transmission channel for the solar cells, internal energy loss is reduced.

[0015] This invention uses low-temperature solder paste to connect battery cells. Because the low-temperature solder paste has a low melting point, it reduces the risk of heat damage during the soldering process. At the same time, the low-temperature solder paste can effectively spread and adhere to the soldering surface, ensuring a good soldering connection and reducing the difficulty and workload of stacking cells. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the specific structure of the present utility model;

[0017] Figure 2 This is an enlarged structural view of the connection between the front and back of the battery chip described in this utility model;

[0018] Figure 3This is a schematic diagram of the front structure of the battery chip described in this utility model;

[0019] Figure 4 This is a schematic diagram of the structure of the back of the battery chip described in this utility model.

[0020] Among them: 1. Front of battery cell, 2. Back of battery cell, 3. Main grid line, 4. Main grid line solder joint, 5. Insulating tape, 6. Metal conductor, 7. Low temperature solder paste, 8. Cutting line. Detailed Implementation

[0021] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0022] A type of shingled component, such as Figures 1 to 4 As shown, it includes several small battery pieces cut along the battery cell cutting line 8. The small battery pieces are arranged alternately with positive and negative polarities and overlap each other in a string. The back side 2 of the previous small battery piece overlaps the front side 1 of the next small battery piece.

[0023] Several main grid lines 3 are respectively provided on the front side 1 and the back side 2 of the battery cell, and several main grid line solder points 4 are provided on the main grid lines 3.

[0024] An insulating strip 5 is provided at the position where the front side 1 and the back side 2 of the battery cell overlap, avoiding the electrode position. The insulating strip 5 is a narrow strip, and the corners of the insulating strip 5 are designed with bevels or rounded corners. The width of the insulating strip after stacking is 1mm to 2mm.

[0025] At least one main grid line solder joint 4 on each main grid line 3 is located within the insulating strip 5 but is not covered by the insulating strip, ensuring the connection between the front main grid line and the back main grid line, facilitating the transmission of current between the positive and negative poles.

[0026] Between the two layers of insulating tape 5, there is also a metal conductor 6 that is aligned with the direction of the cutting line 8. The metal conductor 6 is made of copper wire, silver-coated copper wire, solder strip, or silver foil.

[0027] The metal conductor 6 can be a thin wire with a diameter of 0.08-0.15mm, which can be selected according to the current or resistance requirements.

[0028] Metal conductors can also be thin films with smooth and uniform surfaces, with a thickness of 0.05-0.20 mm.

[0029] Low-temperature solder paste 7 is applied intermittently or continuously within the insulating strip area along the cutting line 8, and the width of the low-temperature solder paste 7 is smaller than the width of the insulating strip 5.

[0030] Low-temperature solder paste has a lower melting point (usually around 138°C) and can complete the soldering process at relatively low temperatures (120°C-160°C), reducing the risk of heat damage.

[0031] Low-temperature solder paste has good wettability, which can effectively spread and adhere to the soldering surface, ensuring a good solder joint. Due to the low soldering temperature, it can also reduce energy costs in the production process.

[0032] When applying the low-temperature solder paste 7, it is necessary to ensure that the metal conductor 6 and the main grid line solder joint 4 are also coated with low-temperature solder paste 7. The main grid line solder joint 4 and the metal conductor 6 are connected by the low-temperature solder paste, and the main grid lines on each cell are connected by the metal conductor 6. This can serve as an efficient internal current transmission channel for the cell. Since the metal conductor has excellent conductivity and low resistance, it can reduce internal energy loss.

[0033] The manufacturing steps of the shingled assembly described in this utility model are as follows:

[0034] The first step is to pre-treat the silicon wafer and print electrodes, then cut it to form a solar cell;

[0035] The second step is to print the insulating tape 5 onto the battery cell using a screen printing process, ensuring that at least one main grid line solder point 4 on the front and back main grid lines of the battery cell is located within the insulating tape area.

[0036] The third step is to cut the battery cell into several smaller battery pieces along cutting line 8.

[0037] The fourth step is to arrange the battery pieces in alternating positive and negative polarities and overlap them in a string. During the arrangement, the back 2 of the previous battery piece overlaps the front 1 of the next battery piece. At the same time, a metal conductor 6 is installed at the overlapping part, and low-temperature solder paste 7 is applied to the insulating strip 5 between the front and back of the battery piece to connect the front of the battery piece to the back of another battery piece.

[0038] When applying the low-temperature solder paste 7, it is necessary to ensure that the low-temperature solder paste 7 is also applied between the metal conductor 6 and the main grid solder joint 4.

[0039] This invention provides a shingled module that uses screen printing to print insulating tape on the surface of the solar cells, avoiding the electrode positions and main grid solder joints. This ensures insulation and does not affect the positive and negative electrode connections of the solar cells or the transmission of current to the main grid lines. Furthermore, by setting a metal conductor as an efficient internal current transmission channel for the solar cells, internal energy loss is reduced.

[0040] This invention uses low-temperature solder paste to connect battery cells. Because the low-temperature solder paste has a low melting point, it reduces the risk of heat damage during the soldering process. At the same time, the low-temperature solder paste can effectively spread and adhere to the soldering surface, ensuring a good soldering connection and reducing the difficulty and workload of stacking cells.

Claims

1. A shingled module, characterized in that: The battery includes several small battery pieces cut along the cutting line (8). The small battery pieces are arranged in alternating positive and negative polarities and overlap each other in a string. The back side (2) of the previous small battery piece overlaps the front side (1) of the next small battery piece. Several main grid lines (3) are respectively provided on the front side (1) and the back side (2) of the small battery piece. Several main grid line solder joints (4) are provided on the main grid line (3). An insulating strip (5) is provided at the position where the front side (1) and the back side (2) of the small battery piece overlaps, avoiding the electrode position. At least one main grid line solder joint (4) on each main grid line (3) is located in the insulating strip (5) but is not covered by the insulating strip. A metal conductor (6) in the same direction as the cutting line (8) is also provided between the two layers of insulating strips (5). Low temperature solder paste (7) is coated in the area of ​​the insulating strip along the cutting line (8).

2. A shingled assembly according to claim 1, characterized in that: The insulating strip (5) is narrow and the corners of the insulating strip (5) are designed with bevels or rounded corners.

3. A shingled assembly according to claim 1, characterized in that: The width of the low-temperature solder paste (7) is smaller than the width of the insulating tape (5).

4. A shingled assembly according to claim 1, characterized in that: The low-temperature solder paste (7) is applied intermittently or continuously to the insulating area of ​​the insulating tape, and the low-temperature solder paste is applied to the position where the main grid solder joint (4) contacts the metal conductor (6).

5. A shingled assembly according to claim 1, characterized in that: The metal conductor (6) is copper wire, silver-clad copper wire, solder strip, or silver foil.

Images