Negative spacing photovoltaic cell string and negative spacing photovoltaic module

Abstract

The utility model discloses a negative spacing photovoltaic cell string and a negative spacing photovoltaic assembly, comprising a plurality of cells, a solder strip and an insulating adhesive film, the plurality of cells are arranged in sequence, the edges of two adjacent cells are in an up-and-down superposed shape, the insulating adhesive film is arranged in the superposed area, the left and right sides of the insulating adhesive film exceed the superposed area, and the solder strip is arranged on the upper and lower sides of the insulating adhesive film. A solder strip is arranged between two adjacent battery pieces, the left side of the solder strip is connected with the top surface of the lower battery piece, the middle part of the solder strip is connected with the bottom surface of the insulating adhesive film, and the right side of the solder strip is connected with the bottom surface of the upper battery piece. The utility model can effectively solve the problems that the joint of the adjacent batteries of the battery string is easy to be subjected to stress or external force to cause subfissure or piece cracking, the assembly repair affects the production efficiency and the product yield, and the area of the blank area between the battery pieces is wasted.

Description

Technical Field

[0001] This utility model relates to the technical field of photovoltaic modules, and in particular to a negative-pitch photovoltaic cell string and a negative-pitch photovoltaic module. Background Technology

[0002] Existing technology uses solder strips as wires to interconnect the positive and negative terminals of the battery. To avoid short circuits between the positive and negative terminals of the battery, a certain spacing (1-2mm) needs to be set between the batteries. A certain number of batteries are then formed into a battery string, and after stacking, lamination and sealing, assembly and curing, a finished photovoltaic module is formed.

[0003] As a crucial component of the new energy sector, the photovoltaic (PV) new energy industry has experienced rapid development in recent years, leading the world. Currently, cost reduction and efficiency improvement are the key themes for the industry's development. In existing cell string manufacturing processes, the connection points between adjacent cells are susceptible to stress or external forces, leading to microcracks or cell breakage. This results in module rework, impacting production efficiency and product yield, and wasting space in the blank areas between cells. Utility Model Content

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a negative-pitch photovoltaic cell string and a negative-pitch photovoltaic module, which can effectively solve the problem that the connection between adjacent cells in the cell string is easily subjected to stress or external force, resulting in microcracks or cell cracks, causing module rework, affecting production efficiency and product yield, as well as the waste of blank area between cells.

[0005] The objective of this utility model can be achieved by adopting the following technical solutions:

[0006] A negative-pitch photovoltaic cell string includes multiple solar cells, solder ribbons, and an insulating film. The solar cells are arranged sequentially, with the edges of adjacent solar cells stacked vertically. An insulating film is provided in the stacked area, and the left and right sides of the insulating film extend beyond the stacked area. A solder ribbon is provided between adjacent solar cells, with the left side of the solder ribbon connected to the top surface of the lower solar cell, the middle part connected to the bottom surface of the insulating film, and the right side connected to the bottom surface of the upper solar cell.

[0007] Furthermore, the insulating film is made of POE or EVA material.

[0008] Furthermore, the width of the insulating film is 8-10 mm.

[0009] Furthermore, the insulating film extends 3-5 mm beyond the right edge of the underlying battery cell.

[0010] A negative-pitch photovoltaic module, comprising the aforementioned negative-pitch photovoltaic cell string.

[0011] Compared with the prior art, this utility model has the following advantages and beneficial effects:

[0012] 1. This utility model, by adding an insulating film of POE / EVA material between the cells during the series connection process of the battery cells and the welding ribbon, not only can the series connection between the battery cells be achieved without gaps or with negative gaps, but the soft material and thin sheet structure can also play a buffering and protective role, effectively avoiding microcracks or cracks caused by stress or external force on the head and tail of the battery cells during the welding process, thereby improving production efficiency and product yield.

[0013] 2. This utility model adopts a negative spacing design, which utilizes the blank area between the cells to use larger batteries under the same product size, thereby improving product power and conversion efficiency. At the same time, the battery string with no gaps between the cells can reduce the printing on the glaze area of ​​the back glass, reduce material costs, and effectively improve the back conversion rate after reducing obstruction. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of the photovoltaic cell string of this utility model.

[0015] Figure 2 This is a cross-sectional view of the photovoltaic cell string of this utility model.

[0016] Figure 3 This is a schematic diagram of the back glass of the photovoltaic module of this utility model. Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some embodiments of this utility model, but not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the protection scope of this utility model.

[0018] Example 1:

[0019] like Figures 1 to 2 As shown, this embodiment provides a negative-pitch photovoltaic cell string, including multiple solar cells 2, solder ribbons 1, and insulating film 3. The multiple solar cells are arranged sequentially, with the edges of two adjacent solar cells 2 stacked vertically, and the stacked area is provided with insulating film 3. The left and right sides of insulating film 3 extend beyond the stacked area. Solder ribbons are provided between two adjacent solar cells 2, and the left side of solder ribbon 1 is connected to the top surface of the solar cell below, the middle part is connected to the bottom surface of insulating film, and the right side is connected to the bottom surface of the solar cell above.

[0020] Furthermore, the insulating film is made of POE or EVA material, which is similar to the encapsulation film. After lamination, it can be integrated and transparent, without affecting the conversion efficiency. Moreover, the position covered by the insulating film is exactly the empty position left at the end of the battery pack in the original welding method, without affecting the effective welding area.

[0021] Furthermore, the width of the insulating film is 8–10 mm.

[0022] Furthermore, the insulating film extends 3-5 mm beyond the right edge of the underlying battery cell.

[0023] Example 2:

[0024] This embodiment provides a negative-pitch photovoltaic module, including the negative-pitch photovoltaic cell string described in Embodiment 1.

[0025] The fabrication method of negative-pitch photovoltaic modules is as follows:

[0026] S1. First, the welding strip traction device of the string welding machine pulls the round wire welding strip 1 cut to a set length to the set position. Then the robot places the qualified battery cell 2 according to the set position and the first cell of the battery string is placed in the correct position.

[0027] S2. The welding strip traction device pulls the round wire welding strip 1, which has been cut to a set length, to the grid line of the battery cell 2 and aligns it.

[0028] S3. The laying device attaches the insulating film 3 to the welding strip at the tail of the battery cell and extends it 3-5mm beyond the tail (i.e., the right edge). The film has a certain viscosity and can be fixed at this position on the battery cell.

[0029] S4. The robotic arm places the second qualified battery cell 2 in the set position;

[0030] S5. Repeat steps S2 to S4 to place the third, fourth, ..., ... battery string to reach the required number of 11 pieces.

[0031] S6. The welding strip traction device cuts the round wire welding strip to a set length, and the robot then places the qualified battery cells according to the set position, and places the first battery cell of the second string in the set position.

[0032] S7. The placed battery cells are driven by the conveyor belt to the welding mechanism, where they are heated under the light box. The welding strip is welded to the main grid of the battery, and the insulating film is preheated and better adhered to the battery.

[0033] S8. Repeat steps S5 to S7 to produce battery strings in sequence and group them according to the required quantity of 12 strings.

[0034] S9. The sorted battery strings are stacked and arranged in a combined manner with the automatic layout machine, automatic stacking and welding machine, back layup machine, EL appearance integrated machine and automatic production line.

[0035] S10. The qualified stacked components flow into the laminator cavity for high-temperature vacuum sealing. The insulating film and the commonly used encapsulating film are made of the same material. They are cured under high temperature conditions to form a transparent structure with high light transmittance, effectively vacuum sealing the battery pack.

[0036] S11. After the laminated semi-finished components are trimmed, the assembly process is completed with the combined assistance of frame gluing machine, framing machine, junction box welding machine, glue dispensing machine, and production line equipment. After curing, the component product is completed.

[0037] This embodiment uses the N-type battery 210-66 model as an example. The battery uses a 210*212.5mm specification, with product dimensions of 2384*1303*33mm, and uses 2378*1297*2.0mm glass (front coated / back glazed mesh). The usable inter-cell blank area can increase by approximately 0.037㎡, and the back glass 4... Figure 3 As shown, under STC standard conditions (irradiance 1000W / ㎡, temperature 25℃, AM1.5), the module power is increased by about 8W and the conversion efficiency is increased by about 0.4%.

[0038] The negative-pitch photovoltaic module of this invention has a simple structure and is easy to manufacture. It can be achieved by modifying and upgrading the existing string welding machine by adding a film laying mechanism. It is low in cost and is suitable for both SMBB and OBB batteries. It is not affected by changes in the number of solder strips.

[0039] The above description is only a preferred embodiment of this utility model patent, but the protection scope of this utility model patent is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the scope disclosed in this utility model patent, based on the technical solution and utility model patent concept of this utility model patent, shall fall within the protection scope of this utility model patent.

Claims

1. A negative-pitch photovoltaic cell string, characterized in that: It includes multiple battery cells, solder ribbons, and an insulating film; the multiple battery cells are arranged sequentially, with the edges of adjacent battery cells stacked vertically, and the stacked area is provided with an insulating film; the insulating film is made of POE or EVA material; the width of the insulating film is 8-10mm, and its left and right sides extend beyond the stacked area, and it extends beyond the right edge of the lower battery cell by 3-5mm; a solder ribbon is provided between two adjacent battery cells, and the left side of the solder ribbon is connected to the top surface of the lower battery cell, the middle part is connected to the bottom surface of the insulating film, and the right side is connected to the bottom surface of the upper battery cell.

2. A negative-pitch photovoltaic module, characterized in that, Includes the negative-pitch photovoltaic cell string as described in claim 1.

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