Photovoltaic cell welding device

Abstract

The utility model discloses a photovoltaic cell welding device which comprises a rectangular frame, and a cross beam used for extruding a photovoltaic cell and a welding strip is arranged in the frame. The device is characterized in that grid fiber cloth used for preventing stress points of the photovoltaic cells from cracking is arranged above the cross beams. The device is made of a light carbon fiber material, so that the stress point crack of the photovoltaic cell caused by overweight of a traditional tool can be avoided; the grid fiber cloth uniformly applies force in the photovoltaic cell welding process, the welding quality is improved, and the situation that the conversion efficiency is reduced due to damage of the internal microstructure of the cell is avoided; the flexibility of the carbon fiber avoids the rigid contact between the tool and the photovoltaic cell, so that the damage to the photovoltaic cell is avoided; the flexible carbon fibers replace metal welding points, metal fatigue of springs in the welding points is avoided, the welding quality is improved, the service life of the tool is prolonged, and meanwhile the maintenance cost of the tool is reduced.

Description

Technical Field

[0001] The utility model relates to a photovoltaic cell assembly tool, in particular to a photovoltaic cell welding device. Background Art

[0002] In the process of string welding of photovoltaic modules, after the cell is cut in half, the positive and negative electrodes of the half-cell are connected end to end on the welding machine by welding with welding tape to form a battery pack. During the welding process, a welding tool is usually required to press and fix the welding tape on the surface of the cell to complete the welding. The mainstream welding tool in the market is usually made of aluminum alloy, with a large number of metal welding points arranged inside, and a single piece weight between 400-500g. During the welding process, the welding tool presses the welding tape on the surface of the cell, and transfers heat to the welding position through direct and indirect methods to weld the welding tape firmly to the surface of the cell. With the continuous advancement of photovoltaic technology, during the experimental development process, some researchers found that the conversion efficiency of the cell will decay by 0.5-0.7% after the cell is only pressed by the tool, and the decay is particularly significant on heterojunction cells. The decay occurs because the internal spring of the metal welding point undergoes metal fatigue during long-term work, resulting in excessive force acting on the surface of the cell, which leads to the destruction of the internal microstructure, thereby reducing the conversion efficiency. Utility Model Content

[0003] Purpose of the utility model: The purpose of the utility model is to provide a photovoltaic cell welding device in order to avoid the attenuation of conversion efficiency caused by cracks in the photovoltaic cell during the welding process.

[0004] Technical solution: The photovoltaic cell welding device described in the utility model includes a rectangular frame, in which a crossbeam for squeezing photovoltaic cells and welding strips is provided; it is characterized in that a mesh fiber cloth for avoiding cracks at the stress points of the photovoltaic cells is provided above the crossbeam.

[0005] Furthermore, the mesh fiber cloth and the cross beam are made of carbon fiber, and the elongation of the carbon fiber is ≥1.8%, thereby ensuring the micro-elasticity of the mesh fiber cloth and the flexible contact between the cross beam and the photovoltaic cell.

[0006] Furthermore, the size of the mesh fiber cloth is 90-105*180-215mm*0.1-0.2mm.

[0007] Furthermore, the crossbeam is a rectangular parallelepiped or a cylinder, so as to avoid hard contact between the crossbeam and the welding strip, thereby preventing uneven welding and affecting the performance of the photovoltaic cell.

[0008] Furthermore, the crossbeam is arranged in the middle of the length direction of the mesh fiber cloth, and multiple crossbeams are arranged at equal intervals in the width direction of the mesh fiber cloth. The spacing and number of the crossbeams can be adjusted according to the welding position of the photovoltaic cell.

[0009] Furthermore, the length of the crossbeam is less than that of the mesh fiber cloth, and the mesh fiber cloth applies uniform pressure to the entire crossbeam, thereby improving the welding uniformity of the photovoltaic cells, avoiding cracks at the stress points of the photovoltaic cells, and thus improving the performance of the photovoltaic cells.

[0010] Furthermore, the length of the crossbeam is 175-205 mm, and the thickness is 0.1-0.2 mm.

[0011] Furthermore, the frame is provided with a mounting groove for fixing the mesh fiber cloth, so as to facilitate the replacement of the mesh fiber cloth.

[0012] Furthermore, the frame is provided with mounting holes for fixing the photovoltaic cell welding device, which is used to fix the tooling during the welding process.

[0013] Beneficial effects: Compared with the prior art, the utility model has the following advantages: 1. The device is made of lightweight carbon fiber material, which can avoid cracks at the stress points of photovoltaic cells caused by excessive weight of traditional tooling; 2. The mesh fiber cloth applies force evenly during the welding process of photovoltaic cells, improving the welding quality and avoiding damage to the internal microstructure of the battery and reducing the conversion efficiency; 3. The flexibility of carbon fiber avoids hard contact between the tooling and the photovoltaic cell, avoiding damage to the photovoltaic cell; 4. Flexible carbon fiber replaces metal welding points, avoiding metal fatigue of the springs inside the welding points, improving welding quality and tooling service life, while reducing tooling maintenance costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the structure of the utility model;

[0015] Figure 2 It is a side view of the structure of the utility model;

[0016] Figure 3 This is a working state diagram of the utility model. DETAILED DESCRIPTION

[0017] The technical solution of the utility model is further described below in conjunction with the accompanying drawings.

[0018] like Figure 1-2A photovoltaic cell welding device shown includes a frame 1, and also includes a crossbeam 2 arranged in the frame 1, and a mesh fiber cloth 3 is arranged above the crossbeam 2; the mesh fiber cloth 3 and the crossbeam 2 are made of carbon fiber, and the elongation is ≥1.8%, ensuring the micro-elasticity of the mesh fiber cloth and the flexible contact between the crossbeam and the photovoltaic cell. The size of the mesh fiber cloth 3 is 100*180mm, and the thickness is 0.1mm; the crossbeam 2 is a rectangular parallelepiped, and can also be set as a cylinder as needed. The length of the crossbeam 2 is less than the length of the mesh fiber cloth 3, and its length is 170mm, and the thickness is 0.1mm; the crossbeam 2 is arranged in the middle of the mesh fiber cloth 3 at equal intervals. The mesh fiber cloth 3 is fixed to the frame 1 through the mounting groove 5, and the device is fixed through the mounting hole 4 to assist the welding of the photovoltaic cell.

[0019] like Figure 3 As shown, during the welding process, the welding tape 7 is laid on the surface of the battery cell 6, and the height of the conveyor belt is adjusted so that the height of the battery cell 6 and the welding tape 7 is slightly higher than the distance from the beam 2 to the welding platform, slightly squeezing the mesh fiber cloth 3, causing the mesh fiber cloth 3 to undergo a slight deformation, during which a force of about 0.1 to 0.5 N is generated and evenly applied to the welding tape 7 to complete the welding process.

Claims

1. A photovoltaic cell welding device, comprising a rectangular frame (1), in which a crossbeam (2) for pressing a photovoltaic cell (6) and a welding strip (7) is arranged; characterized in that: A mesh fiber cloth (3) is provided above the crossbeam (2) to prevent cracks at stress points of the photovoltaic cells.

2. The photovoltaic cell welding device according to claim 1, characterized in that: The mesh fiber cloth (3) and the crossbeam (2) are made of carbon fiber.

3. The photovoltaic cell welding device according to claim 1, characterized in that: The size of the mesh fiber cloth (3) is 90-105*180-215mm*0.1-0.2mm.

4. The photovoltaic cell welding device according to claim 1, characterized in that: The crossbeam (2) is a rectangular parallelepiped or a cylinder.

5. The photovoltaic cell welding device according to claim 4, characterized in that: The crossbeam (2) is arranged in the middle of the mesh fiber cloth (3) in the length direction, and a plurality of crossbeams (2) are arranged at equal intervals in the width direction of the mesh fiber cloth (3).

6. The photovoltaic cell welding device according to claim 4, characterized in that: The length of the crossbeam (2) is smaller than the length of the mesh fiber cloth (3).

7. The photovoltaic cell welding device according to claim 4, characterized in that: The crossbeam (2) has a length of 175-205 mm and a thickness of 0.1-0.2 mm.

8. The photovoltaic cell welding device according to claim 1, characterized in that: The frame (1) is provided with a mounting groove (5) for fixing the mesh fiber cloth (3).

9. The photovoltaic cell welding device according to claim 1, characterized in that: The frame (1) is provided with a mounting hole (4) for fixing the photovoltaic cell welding device.

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