A method for positioning and connecting metal-free electrode cells in a photovoltaic module

Abstract

The application provides a positioning and connecting method of a non-metal electrode cell in a photovoltaic module, and belongs to the technical field of photovoltaic modules; in the application, a different manufacturing process is adopted from a conventional photovoltaic module, and a conductive connecting wire is directly connected with a TCO cell piece (a non-metal electrode cell piece), so that the positioning precision requirement of the conductive connecting wire and the cell piece can be effectively reduced, and the cell piece placing and fixing speed is improved; the positioning and connecting method of the non-metal electrode cell in the photovoltaic module is simple and suitable for large-scale production of photovoltaic modules.

Description

Technical Field

[0001] This invention belongs to the field of photovoltaic module technology, specifically relating to a method for positioning and connecting metal electrode-free cells in a photovoltaic module. Background Technology

[0002] With the continuous advancement of cost reduction and efficiency improvement in the photovoltaic industry, the economic viability of photovoltaic power generation is becoming increasingly prominent, and the installed capacity of photovoltaics is showing a rapid growth trend. With the rapid development of photovoltaic technology, the demand for high-power modules is also increasing. Reducing the cost of photovoltaic modules and improving their efficiency and reliability are ongoing goals for photovoltaic power generation. However, current photovoltaic module manufacturing processes suffer from high requirements for cell positioning and slow cell placement and fixing speeds, which significantly impacts the production efficiency of photovoltaic modules. Therefore, a cell connection method that reduces the accuracy requirements for cell positioning and improves the speed of cell placement and fixing is needed. Summary of the Invention

[0003] To address the shortcomings of existing technologies, this invention provides a method for positioning and connecting metal-electrode-less cells in photovoltaic modules. This invention employs a different manufacturing process than conventional photovoltaic modules, directly connecting conductive connecting wires to TCO (metal-electrode-less) cells. This effectively reduces the accuracy requirements for positioning the conductive connecting wires and cells, and improves the speed of cell placement and fixing. The method for positioning and connecting metal-electrode-less cells in photovoltaic modules is simple and suitable for large-scale production of photovoltaic modules.

[0004] The present invention achieves the above-mentioned technical objectives through the following technical means.

[0005] A method for positioning and connecting metal electrode-less cells in a photovoltaic module, comprising:

[0006] (1) The front panel and back panel are bonded and cross-linked with the adhesive film respectively. After the cross-linking is completed, the conductive connecting wires and busbars are embedded into the adhesive film of the front panel and back panel by hot pressing. Then the conductive connecting wires are divided according to the width of the battery cell to obtain the front panel preform and the back panel preform respectively.

[0007] (2) The TCO battery cells are sequentially laid onto the conductive connection lines of the front panel prefabricated component. The laying process includes laying the TCO battery cells onto the conductive connection lines positioned by the positioning device or positioning them at the same time as laying the TCO battery cells.

[0008] Repeat the above laying operation until the battery cells are completely laid to obtain the battery layer;

[0009] (3) Lamination is performed by pressing the back sheet preform onto the battery layer.

[0010] Furthermore, in step (1), the busbar and the conductive connection wire overlap at both ends.

[0011] Furthermore, in step (2), the positioning device includes a positioning fixture.

[0012] Furthermore, the positioning device is preferably an L-shaped positioning fixture.

[0013] Furthermore, the L-shaped positioning fixture is positioned by using a cylinder to control the L-shaped positioning fixture to one end of the conductive connection line on the front panel prefabricated part. After positioning, the battery cell is laid and fixed in the triangular part of the L-shaped positioning fixture.

[0014] After the cells are laid and fixed, the L-shaped positioning fixture is moved to the right by a cylinder to position itself on the conductive connection line. The cell laying and fixing operation is repeated. After the cells are laid and fixed, the first row of cells of the photovoltaic module is laid and fixed.

[0015] Furthermore, in step (2), the L-shaped positioning device includes two devices, which are positioned at the beginning and end of the front panel prefabricated part respectively, and the TCO battery cells are laid and fixed simultaneously.

[0016] Further, in step (2), after laying, the TCO battery cell is fixed.

[0017] Furthermore, the fixing includes fixing by heating to melt the adhesive film or fixing by sticking adhesive tape.

[0018] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0019] In this invention, the front / back plate, adhesive film, conductive connecting wires, and busbars are first prefabricated into front plate prefabricated parts and back plate prefabricated parts. The pre-crosslinking of the front / back plate and adhesive film provides better fixation, making the adhesive film more stable and preventing delamination. Furthermore, the pre-crosslinking of the adhesive film allows the conductive connecting wires and busbars to be embedded into the adhesive film of the front and back plate prefabricated parts via hot pressing, which can improve the process speed of the production line and increase output.

[0020] In this invention, a different manufacturing process than conventional photovoltaic modules is adopted, directly connecting the conductive connecting lines on the front panel prefabricated component and the back panel prefabricated component to the TCO solar cell. This eliminates the need to align the electrodes of the solar cell with the conductive connecting lines, effectively reducing the accuracy requirements for the positioning of the conductive connecting lines and the solar cell, and improving the speed of solar cell placement and fixing. The positioning and connection method of the metal electrode-less solar cell in the photovoltaic module is simple and suitable for the large-scale production of photovoltaic modules.

[0021] In this invention, due to the reduced precision required for cell placement, only simple mechanical positioning is needed to lay at least two TCO cells or at least one string of TCO cells. Compared to existing technologies, the placement speed of the method described in this invention is increased several times, eliminating cell placement and welding as bottleneck processes in module manufacturing and significantly improving module production speed. Simultaneously, the equipment is simple and has high capacity, reducing the need for expensive equipment such as vision positioning and robots, greatly lowering the cost per unit and the amount of equipment used, thus saving production and management costs. Attached Figure Description

[0022] Figure 1 This is a front view of the photovoltaic module described in this invention.

[0023] Figure 2 This is a partial front view of the photovoltaic module described in this invention.

[0024] Figure 3 This is a back view of the photovoltaic module described in this invention.

[0025] Figure 4 This is a diagram showing the location of the battery cells.

[0026] Figure 5 The figure shows the three views of an L-shaped positioning fixture. In the figure, a is the top view, b is the side view, and c is the front view.

[0027] Figure label:

[0028] 1-Conductive connecting wire; 2-Busbar. Detailed Implementation

[0029] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, but the scope of protection of the present invention is not limited thereto.

[0030] Example 1:

[0031] This embodiment provides a detailed description of the positioning and connection method for the metal electrode-less cells in the photovoltaic module, specifically including the following steps:

[0032] (1) such as Figures 1-3 As shown, the front panel and back panel are cross-linked with the adhesive film. After cross-linking, the conductive connecting wire 1 and the busbar 2 are embedded into the adhesive film of the front panel and back panel by hot pressing, with the busbar 2 overlapping the conductive connecting wire 1 end to end. Then, the conductive connecting wire 1 is divided according to the width of the battery cell to obtain the front panel preform and the back panel preform respectively.

[0033] (2) A positioning device is used to position the TCO battery cells on the prefabricated front panel, after the conductive connection line 1 has been divided. After positioning, the TCO battery cells are laid on it. The positioning and laying operations are repeated until the battery cells are completely laid, resulting in the following: Figure 4 The battery layer shown;

[0034] (3) Lamination is performed by pressing the back sheet preform onto the battery layer.

[0035] The conductive connecting wire 1 described below uses a triangular metal wire as an example. However, the connection between TCO battery cells in this invention is not limited to triangular metal wire. Other conductive connecting wires with structures such as circles, flat surfaces, semicircles, and trapezoids can also be used.

[0036] In addition, the positioning device is as follows Figure 5 Taking the L-shaped positioning fixture shown as an example, the L-shaped positioning fixture is made of Teflon. When using it to lay TCO solar cells, a cylinder controls the L-shaped positioning fixture to position it at one end of the photovoltaic module. A heated suction cup is used to place the TCO solar cell onto the triangular part of the L-shaped positioning fixture. The suction cup lowers the TCO solar cell and heats it until the adhesive film melts, thus fixing the TCO solar cell. After positioning, the solar cell is laid and fixed in the triangular part of the L-shaped positioning fixture. After laying and fixing, the cylinder controls the L-shaped positioning fixture to move to the right and position it on the triangular metal wire. The solar cell laying and fixing operation is repeated. After laying and fixing, the first row of TCO solar cells in the photovoltaic module is laid and fixed. Then, the L-shaped positioning fixture is moved downwards, and the positioning-laying operation is repeated until all TCO solar cells are laid, resulting in the solar cell layer. In the specific positioning process, the positioning fixture can be used for positioning first, and then the TCO solar cells are laid, or the positioning can be performed simultaneously with the laying of the TCO solar cells.

[0037] In practical implementation, positioning devices can be used at both ends of the front panel prefabricated component to simultaneously lay TCO solar cells, thereby increasing the laying speed of the TCO solar cells. This invention employs a different manufacturing process than conventional photovoltaic modules, directly connecting the triangular metal wires on the front and back panel prefabricated components to the TCO solar cells. This eliminates the need to align the solar cell electrodes with the triangular metal wires, effectively reducing the accuracy requirements for positioning the triangular metal wires and solar cells, and improving the speed of solar cell placement and fixing. The positioning and connection method for the metal electrode-less cells in the photovoltaic module is simple and suitable for large-scale production of photovoltaic modules.

[0038] The embodiments described above are preferred embodiments of the present invention, but the present invention is not limited to the above embodiments. Any obvious improvements, substitutions or modifications that can be made by those skilled in the art without departing from the essence of the present invention shall fall within the protection scope of the present invention.

Claims

1. A method for positioning and connecting metal electrode-less cells in a photovoltaic module, characterized in that, include: (1) The front panel and back panel are bonded and cross-linked with the adhesive film respectively. After the cross-linking is completed, the conductive connecting line (1) and the bus bar (2) are embedded into the adhesive film of the front panel and the back panel by hot pressing. Then the conductive connecting line (1) is divided according to the width of the battery cell to obtain the front panel preform and the back panel preform respectively. The bus bar (2) is connected to the conductive connecting line (1) at both ends. (2) The TCO battery cells are sequentially laid onto the conductive connection lines (1) of the front panel prefabricated part. The laying process includes: laying the TCO battery cells onto the conductive connection lines (1) positioned by the positioning device or positioning them at the same time as laying the TCO battery cells; the positioning device includes positioning fixtures; the positioning device includes two, which are positioned at the beginning and end of the front panel prefabricated part respectively, and the laying and fixing of the TCO battery cells are carried out simultaneously. Repeat the above laying operation until the battery cells are completely laid to obtain the battery layer; (3) Lamination is performed by pressing the back sheet preform onto the battery layer.

2. The method for positioning and connecting metal electrode-less cells in a photovoltaic module according to claim 1, characterized in that, The positioning device is an L-shaped positioning fixture.

3. The method for positioning and connecting metal electrode-less cells in a photovoltaic module according to claim 2, characterized in that, The L-shaped positioning fixture is positioned by a cylinder to one end of the conductive connection line (1) on the front panel prefabricated part. After positioning, the battery cell is laid and fixed on the triangular part of the L-shaped positioning fixture. After the installation and fixing are completed, the L-shaped positioning fixture is moved to the right by the cylinder to be positioned on the conductive connection line (1). The installation and fixing operation of the battery cells is repeated. After the installation and fixing are completed, the first row of battery cells of the photovoltaic module is installed and fixed.

4. The method for positioning and connecting metal electrode-less cells in a photovoltaic module according to claim 1, characterized in that, In step (2), after laying, the TCO battery cells are fixed.

5. The method for positioning and connecting metal electrode-less cells in a photovoltaic module according to claim 4, characterized in that, The fixing process includes heating to melt the adhesive film and fixing it, or sticking adhesive tape to fix it.

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