High security photovoltaic module

Abstract

The utility model provides a kind of photovoltaic module of high security, comprising: cylindrical solder strip, lower cell piece and upper cell piece, lower cell piece and upper cell piece are connected by cylindrical solder strip, and the middle of cylindrical solder strip is equipped with at least one local flattening portion;When welding cylindrical solder strip, because local flattening portion is flat, cylindrical solder strip as a whole cannot roll on lower cell piece and upper cell piece, realize relative position unchanged, realize accurate welding.

Description

Technical Field

[0001] This utility model relates to the field of photovoltaic module technology, and in particular to a high-safety photovoltaic module. Background Technology

[0002] In the current photovoltaic module manufacturing process, solar cells are connected in series and welded together using cylindrical tin-plated copper strips (soldering strips) to create a cell string. During production, because the soldering strips are cylindrical, they roll when placed on the surface of the solar cells, causing changes in the relative positions of the soldering strips and solar cells, resulting in poor welding.

[0003] Furthermore, because the solar cells are made of silicon, which is very brittle, and their thickness is only 0.12mm (and will be further reduced with technological advancements), the current industry standard for solder ribbon thickness is 0.24mm to 0.35mm. Such thick solder ribbons easily cause the solar cells to crack when passing through the gaps between them. Therefore, a high-safety photovoltaic module has been proposed. Utility Model Content

[0004] To address at least one of the aforementioned technical shortcomings, this utility model provides a high-safety photovoltaic module, comprising: a cylindrical welding strip, a lower solar cell, and an upper solar cell, wherein the lower solar cell and the upper solar cell are connected by the cylindrical welding strip, and the cylindrical welding strip has at least one locally flattened portion in the middle.

[0005] Furthermore, at least one slit is evenly provided on the locally flattened portion, forming at least two slits, so that the locally flattened portion and the slits constitute a flat tree root shape.

[0006] Furthermore, the thickness of the locally flattened portion is 0.03 to 0.12 mm, and the number of slits is set to 1 to 4, forming 2 to 5 slits.

[0007] Furthermore, the partially flattened portion is disposed in the gap between the lower and upper battery cells, and the thickness of the partially flattened portion is less than the thickness of the lower and upper battery cells.

[0008] Furthermore, the locally flattened portions form a parallel structure through the setting of slits.

[0009] Furthermore, three locally flattened portions are provided. Beneficial effects

[0010] When welding cylindrical welding strips, the flattened portion prevents the cylindrical welding strip from rolling on the lower and upper battery cells, thus maintaining its relative position and enabling precise welding.

[0011] The cylindrical welding strip portion with partial flattening and slits is first placed in the gap between the lower and upper battery cells. This allows the flat structure of the partial flattening portion to be close to or even thinner than the lower and upper battery cells. As a result, the deformed cylindrical welding strip is less likely to cause the lower and upper battery cells to break when passing through the gap, thus improving the product yield.

[0012] The resistance of the refined section formed by the slitting seam is lower because this structure is equivalent to 1 / n of the resistance of the original cylindrical solder strip; because the cylindrical solder strip in this region has a parallel structure instead of a series structure. This reduces internal power loss and thus increases output power. The slitting seam design allows the locally flattened portion of the cylindrical welding strip to be further subdivided into smaller sections. Because the resistance of these subdivided sections is low, the module generates less heat during outdoor power generation, making it safer and more reliable. Furthermore, the low heat generation, combined with the characteristics of photovoltaic modules, makes low temperatures more conducive to power generation, ultimately further promoting power output.

[0013] The purpose, features, and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Attached Figure Description

[0014] Figure 1 This is a top view of the cylindrical welding strip of this utility model.

[0015] Figure 2 This is a schematic diagram of the series connection of the lower and upper battery cells of this utility model. Figure 1 .

[0016] Figure 3 This is a schematic diagram of the series connection of the lower and upper battery cells of this utility model. Figure 2 .

[0017] exist Figures 1 to 3 The correspondence between the component name or line and the attached drawing number is as follows: cylindrical welding strip 1, partially flattened part 2, cutting seam 21, lower battery cell 31, upper battery cell 32. Detailed Implementation

[0018] Please refer to Figures 1 to 3 ; This embodiment provides a high-safety photovoltaic module, including: a cylindrical welding strip 1, a lower solar cell 31 and an upper solar cell 32, the lower solar cell 31 and the upper solar cell 32 are connected by the cylindrical welding strip 1, and the cylindrical welding strip 1 has at least one partially flattened portion 2 in the middle.

[0019] When welding the cylindrical welding strip 1, because the locally flattened part 2 is flat, the cylindrical welding strip 1 will not roll on the lower battery cell 31 and the upper battery cell 32, so that the relative position remains unchanged and precise welding is achieved.

[0020] At least one slit 21 is evenly provided on the partially flattened part 2, forming at least two slits, so that the partially flattened part 2 and the slits constitute a flat tree root shape.

[0021] The thickness of the partially flattened portion 2 is 0.03 to 0.12 mm, and the number of slits 21 is set to 1 to 4, forming 2 to 5 slits.

[0022] The partially flattened portion 2 is disposed at the gap between the lower battery cell 31 and the upper battery cell 32, and the thickness of the partially flattened portion 2 is less than the thickness of the lower battery cell 31 and the upper battery cell 32.

[0023] The cylindrical welding strip 1, which is part of the partially flattened portion 2 and the slit 21, is first placed in the gap between the lower battery cell 31 and the upper battery cell 32. In this way, the flat structure of the partially flattened portion 2 can be close to or even thinner than the lower battery cell 31 and the upper battery cell 32. This makes it less likely for the lower battery cell 31 and the upper battery cell 32 to break when the deformed cylindrical welding strip 1 passes through the gap between the lower battery cell 31 and the upper battery cell 32, thus improving the product yield.

[0024] The partially flattened part 2 forms a parallel structure through the setting of the slit 21.

[0025] The resistance of the slit-refined section formed by the slit 21 is lower because this structure is equivalent to 1 / n of the resistance of the original cylindrical solder strip 1; because the cylindrical solder strip 1 in this region has changed from a series structure to a parallel structure. This can reduce internal power loss and thus increase output power; Because of the slit 21, the locally flattened portion 2 of the cylindrical welding strip 1 is further subdivided into sections. Due to the low resistance of the subdivided portion, the module generates less heat during outdoor power generation, making the module safer and more reliable. Furthermore, the low heat generation of the module, according to the characteristics of photovoltaic modules, is more conducive to power generation at low temperatures, ultimately further promoting power output.

[0026] The partially flattened part 2 has 3 parts.

[0027] In practice, a lower battery cell 31 to be welded is placed; a section of cylindrical welding ribbon 1 is pulled out, and the middle of the cylindrical welding ribbon 1 is flattened and cut to form a partially flattened portion 2 and a cutting seam 21, wherein the thickness of the partially flattened portion 2 after flattening is 0.03mm; the cutting position is 5 segments with four cutting seams 21; then the cylindrical welding ribbon 1 is placed at the designated position of the lower battery cell 31; then the upper battery cell 32 is placed above the welding point; wherein the partially flattened portion 2 of the welding point is located in the gap between the lower battery cell 31 and the upper battery cell 32, and the partially flattened portion 2 extends to the surface of the lower battery cell 31 and the upper battery cell 32. Finally, the lower battery cell 31, the upper battery cell 32, and the cylindrical welding ribbon 1 are placed under a light box for welding under the transport of the conveyor belt. This achieves the series welding of the lower battery cell 31 and the upper battery cell 32.

[0028] The subsequent processes and methods are consistent with existing technologies. It can ensure that the battery string will not break due to the rigidity and robustness of the cylindrical welding strip 1, even under the enormous pressure of the subsequent upper and lower glass pressurization and lamination processes.

[0029] Implementation Case 2: The cylindrical welding strip 1 is flattened and slit in multiple places to form multiple local flattened parts 2 and slit seams 21, which further improves the stability of the cylindrical welding strip 1 on the surface of the lower battery cell 31 and the upper battery cell 32, reduces the resistance of the slit parts, and improves the product yield and output power.

[0030] Implementation Case 3: The local flattened part 2 and the cutting slit 21 can be implemented separately or simultaneously.

Claims

1. A high-security photovoltaic module, comprising: A cylindrical welding strip (1), a lower battery cell (31) and an upper battery cell (32) are connected by the cylindrical welding strip (1), characterized in that: at least one partially flattened portion (2) is provided in the middle of the cylindrical welding strip (1). At least one slit (21) is evenly provided on the locally flattened part (2) to form at least two slits, so that the locally flattened part (2) and the slits form a flat tree root shape; The thickness of the locally flattened portion (2) is 0.03 to 0.12 mm, and the number of slits (21) is set to 1 to 4, forming 2 to 5 slits; The partially flattened portion (2) is provided at the gap between the lower battery sheet (31) and the upper battery sheet (32), and the thickness of the partially flattened portion (2) is less than the thickness of the lower battery sheet (31) and the upper battery sheet (32); The locally flattened part (2) forms a parallel structure through the setting of the slit (21).

2. The high-safety photovoltaic module according to claim 1, characterized in that: There are 3 locally flattened parts (2).

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