CN103943698A - Photovoltaic module with main grid lines arranged side by side - Google Patents

Abstract

The invention discloses a photovoltaic module with side-by-side main grid lines, and relates to the technical field of solar power generation. It includes a plurality of battery slices in series, the main grid lines of the inner battery slices are welded by welding strips; the main grid lines of the outer battery slices are welded with the bus belt; each battery slice has at least two sets of main grid lines ; The number of main grid lines in each group is two; the total width of each group of main grid lines is 0.8-1.6mm; the width of the welding strip is the same as that of the main grid lines. The present invention changes the width of the original thicker busbars and adopts two thinner busbars as a group, which not only reduces the unnecessary covering area, but also adapts to the current density distribution on the battery sheet, and improves the efficiency of photovoltaic modules. Excellent photoelectric conversion efficiency, reducing the amount of busbars and soldering strips, and reducing production costs.

Description

Photovoltaic modules with side-by-side busbars

technical field

The invention relates to the technical field of solar power generation.

Background technique

Solar cells are semiconductor devices that convert solar energy into electrical energy. The grid wire is an important part of the battery, which is responsible for leading the photo-generated current in the battery to the outside of the battery. Although the busbar of the solar cell is a path for collecting current, it is also a conductor that blocks the light-receiving area. Reasonable design of the busbar width is beneficial to reduce the shading area and improve the power generation efficiency. Before developing and manufacturing solar cells, the battery parameters (open circuit voltage, short circuit current density, output voltage and output current density at the maximum operating point, etc.) should be designed in advance. After the battery is manufactured, the actual measured values of the battery characteristic parameters have certain deviations from the design values. Therefore, there will be a certain deviation between the pre-designed busbar size and the ideal size. Therefore, it is necessary to relax the busbar size on the basis of the original design.

In order to obtain the required current, voltage and output power, as well as to protect the battery from mechanical damage and environmental damage, several single-chip batteries must be connected in series and parallel through welding ribbons and packaged into components. At present, no matter the leaded or lead-free soldering strip used, its structure is formed after the copper strip is tinned. The quality requirements for welding strips are electrical conductivity, softness and hardness, and weldability. Never consider the impact of ribbon shielding on power generation of components. For this reason, the encapsulation loss of components is generally all in 2-4%, can be greater than more than 5% sometimes, has brought great economic loss to manufacturer.

Contents of the invention

The technical problem to be solved by the present invention is to provide a photovoltaic module with side-by-side busbars in view of the above technical deficiencies, which changes the width of the original thicker busbars and uses two thinner busbars as a group. The busbar not only reduces the unnecessary covering area, but also adapts to the current density distribution on the cell, improves the photoelectric conversion efficiency of the photovoltaic module, reduces the amount of busbar and welding ribbon, and reduces the production cost.

The technical solution adopted in the present invention is: to provide a photovoltaic module with side-by-side busbars, including a plurality of battery slices in series, the busbars of the inner battery slices are welded by welding ribbon; the busbars of the outer battery slices Wires and busbars are welded; each cell has at least two sets of busbars; the number of each set of busbars is two; the total width of each set of busbars is 0.8-1.6mm; of the same width.

To further optimize this technical solution, each cell of a photovoltaic module with side-by-side busbars is provided with two sets of busbars; the width of each busbar is 0.56mm-0.76mm.

To further optimize this technical solution, each cell of a photovoltaic module with side-by-side busbars is provided with three sets of busbars; the width of each busbar is 0.4mm-0.6mm.

The width and thickness of the main grid line are determined according to the thickness of the battery sheet and the amount of short-circuit current. Generally, the width of the two grid lines of a traditional battery is 2 mm, and the width of the three grid lines is 1.5 mm. However, since the bus bars of the present invention are connected in parallel, the width of each grid line is only the width of the bus bar lines of the traditional cell. About one-third, similarly, the width of the ribbon is only about one-third of that of the traditional ribbon, which reduces the covering area of the battery sheet by the busbar and the ribbon, and improves the photoelectric conversion efficiency of the cell .

To further optimize this technical solution, the cells of the photovoltaic module with side-by-side busbars are polycrystalline silicon cells or monocrystalline silicon cells.

The beneficial effects of the present invention are: the photovoltaic module with side-by-side busbars reduces the width of busbars and welding strips, and changes from one busbar with a width of 2mm to two busbars with a width of 0.4mm-0.76 The main grid line of 100 mm, under the condition of ensuring the thickness of the battery sheet and the amount of short-circuit current, reduces the amount of busbar line and welding ribbon as a whole, reduces the covering area of the battery sheet, and increases the light receiving capacity of the battery The area improves the power generation efficiency of the battery. This technical solution can be realized only by changing the structure of the printing screen, without adding new equipment and without changing the raw materials, which is convenient for widespread promotion.

Description of drawings

FIG. 1 is a schematic structural view of Embodiment 1 of the present invention;

Fig. 2 is a schematic structural diagram of Embodiment 2 of the present invention.

In the figure, 1 cell, 2 bus bars, 3 welding strips, and 4 bus strips.

Detailed ways

The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

Embodiment one:

As shown in Figure 1, a photovoltaic module with side-by-side busbars includes a plurality of battery sheets 1 connected in series, and the busbars 2 of the inner battery sheets 1 are welded by welding ribbons 3; the busbars of the outer battery sheets 1 2 is welded with the busbar; each cell 1 is provided with two sets of busbars 2; the number of each set of busbars 2 is two; the width of the welding ribbon 3 is the same as that of the busbar 2; each busbar 2 The width is 0.56 mm-0.76 mm; the cell 1 is a polycrystalline silicon cell or a monocrystalline silicon cell.

The sum of the width of a group of busbars 2 is 1.12mm-1.52mm, while the width of one thicker busbar used in traditional photovoltaic modules is only 2mm, so the amount of busbars 2 is greatly reduced. The grid lines 2 are made of silver paste, thus reducing the production cost of the photovoltaic module. In this embodiment, the gap between the two busbars 2 of the cell 1 is also illuminated, thereby increasing the light-receiving area.

Embodiment two:

As shown in Figure 2, a photovoltaic module with side-by-side busbars includes a plurality of battery slices 1 connected in series, and the busbars 2 of the inner battery slices 1 are welded by welding ribbons 3; the busbars of the outer battery slices 1 The wire 2 is welded with the bus strip; each cell 1 is provided with three sets of busbar lines 2; the number of each set of busbar lines 2 is two; the width of the welding strip 3 is the same as that of the busbar line 2; each busbar line 2 The width is 0.4 mm-0.6 mm; the cell 1 is a polycrystalline silicon cell or a monocrystalline silicon cell.

The width of the ribbon of the original photovoltaic module is basically the same as that of the traditional busbar, and a 2 mm ribbon is used to connect the busbar in series, and the cover of the solar cell by the ribbon also reduces the light-receiving area. The ribbon of the present invention 3 has the same width as the busbar line 2, reducing the amount of welding ribbon 3 used. the

Claims (4)

1. A photovoltaic module with side-by-side busbars, including a plurality of battery cells (1) connected in series, and the busbars (2) of the inner cells (1) are welded with the help of welding ribbons (3); The busbar (2) of the cell (1) is welded to the busbar; it is characterized in that each cell (1) is provided with at least two groups of busbars (2); the number of each group of busbars (2) is Two; the total width of each group of main grid lines (2) is 0.8-1.6mm; the width of the welding strip (3) is the same as that of the main grid lines (2). 2. The photovoltaic module with side-by-side busbars according to claim 1, characterized in that each cell (1) is provided with two sets of busbars (2); each busbar (2) The width is 0.56mm-0.76mm. 3. The photovoltaic module with side-by-side busbar lines according to claim 1, characterized in that each cell (1) is provided with three sets of busbar lines (2); the width of each busbar line (2) 0.4mm-0.6mm. 4. The photovoltaic module with side-by-side busbars according to claim 2 or 3, characterized in that the cells (1) are polycrystalline silicon cells or monocrystalline silicon cells.