CN-224234090-U - Solar cell unit without main grid back contact

CN224234090UCN 224234090 UCN224234090 UCN 224234090UCN-224234090-U

Abstract

The utility model discloses a solar cell unit without a main grid back contact, which is formed by orderly arranging a plurality of cell units without metal electrode grid lines on a metal electrode film, wherein the cell units are equally divided into N sub-electrode areas along the Y axis direction, each sub-electrode is provided with a first electrode area and a second electrode area along the X axis direction, the first electrode areas and the second electrode areas are alternately and orderly arranged in an intersecting way, a first isolation groove is arranged between the two connected sub-electrode areas, each sub-electrode area forms a single power generation unit, a second isolation groove is arranged between the connected first electrode area and second electrode area, transparent conductive film layers are arranged on the first electrode area and the second electrode area, and a carrier film layer, a first metal grid line, a second metal grid line and a composite film layer are arranged on the metal electrode film. The battery pieces are connected in series effectively through the thin grid lines, a series welding machine and a printing machine are not needed in the production process, equipment investment is saved, working procedures are also saved, and the cost is reduced greatly.

Inventors

ZHOU SIHAI
HUANG JIARONG
YANG YUSHENG
ZHENG JIANXIANG
WU YANPING
QIU JIAZHEN

Assignees

福建省金石能源股份有限公司

Dates

Publication Date: 20260512
Application Date: 20250529

Claims (7)

1. A solar cell unit without main gate back contact is characterized by comprising a plurality of cell units without metal electrode gate lines, wherein the cell units are orderly arranged on a metal electrode film, N sub-electrode areas (N is more than or equal to 2) are equally divided in the Y axis direction of the cell units, a first electrode area and a second electrode area are arranged on each sub-electrode along the X axis direction, the first electrode area and the second electrode area are respectively positively charged and negatively charged and alternately orderly arranged in an intersecting manner, the first electrode area and the second electrode area of the two connected sub-electrode areas are oppositely arranged, a first isolation groove is arranged between the two connected sub-electrode areas, each sub-electrode area forms a single power generation unit, a second isolation groove is arranged between the connected first electrode area and the second electrode area, a transparent conductive film layer is arranged on the first electrode area and the second electrode area, a carrier film layer, a first metal gate line, a second metal gate line and a composite film layer are arranged on the metal electrode film, the first metal gate area and the second metal electrode area are arranged on the surface of the cell unit in a serial mode, the second electrode area is correspondingly arranged on the two end faces of the second electrode area, and the two metal electrode areas are correspondingly arranged on the two end faces of the carrier film, and the two metal electrode areas are correspondingly arranged in a serial mode.
2. The solar cell unit without the main grid back contact according to claim 1, wherein when the number of the sub-electrode areas N is even, the cell units are directly arranged along the Y-axis direction, the spacing W of the cell units is 0.2-1mm, when the number of the sub-electrode areas N is odd, the cell units are arranged along the Y-axis direction, and each piece of the cell units is arranged after being turned 180 degrees, and the spacing W of the cell units is 0.2-1mm.
3. The solar cell unit without the main grid back contact of claim 1, wherein the carrier film layer is made of one of PET, PEN, PCT, PC, PETG, PMMA, COC, EVA, POE, EMA, EAA, EMMA, epoxy, silicone resin, PMA, PU, VAE, PVB and a composite sheet film thereof, and the transmittance of the carrier film layer is more than 85%.
4. The solar cell unit without the main grid back contact of claim 1, wherein the transmittance of the composite adhesive film layer after hot melting is more than 85%, and the composite adhesive film layer is made of one of TPO, EVA, POE, PVB materials.
5. The solar cell unit without the main gate back contact of claim 1, wherein the cross section of the first metal gate line and the second metal gate line is one of triangle, trapezoid, semicircle, rectangle and square.
6. The solar cell unit without the main gate back contact of claim 1, wherein the contact areas of the first metal gate line and the second metal gate line with the first electrode area and the second electrode area are planes.
7. The solar cell unit without the main gate back contact of claim 1, wherein the first metal gate line is composed of a collecting area and a collecting area, and the second metal gate line is composed of a collecting area and a crossing area.

Description

Solar cell unit without main grid back contact Technical Field The utility model relates to the field of solar cells, in particular to a solar cell unit without a main grid back contact. Background A silicon-based back contact solar cell is one in which all electrodes are arranged on the opposite (back) side of the cell, which means that the front side is fully exposed to sunlight, thus improving the light absorption efficiency. In order to lead out photo-generated carriers from the inside of the silicon-based back contact solar cell, the existing traditional technical scheme mainly comprises the steps of printing silver paste grid lines or manufacturing copper metal grid lines on the surface of the cell, collecting carriers generated by photoelectric effect of the silicon-based back contact solar cell, and connecting the photo-generated carriers with the silver paste grid lines or the copper metal grid lines through tin-plated solder strips, so that series-parallel connection among the cells is realized. If only the electrode carrier film is used for carrying out current transmission instead of the thin grid lines of the battery pieces, the shielding area of the back surface can be greatly reduced, and the power generation efficiency of the back surface is improved, but when a plurality of battery pieces are packaged into a component in series, the back grid lines are found to be too thin, and the transmission resistance among the batteries is very large along with the increase of the transmission distance, so that the efficiency of the component is greatly reduced, and more defects exist in the scheme. In the patent CN 221041139U (the photovoltaic electrode of the cross back contact photovoltaic module), another scheme of using the positive electrode wire and the negative electrode wire arranged on the electrode carrier film to replace the traditional printed or electroplated electrode is proposed, but the main purpose is to solve the problems of alignment accuracy and printing repeatability in the existing printing technology, and the problem that the thickness of the electrode cannot be controlled and the yield is low. Disclosure of utility model In view of the above, the present utility model provides a solar cell unit without a main gate back contact. In order to solve the technical problems, the technical scheme is that a solar cell unit without a main gate back contact is formed by orderly arranging a plurality of cell units without metal electrode gate lines on a metal electrode film, the cell units are equally divided into N sub-electrode areas (N is more than or equal to 2) along the Y axis direction, each sub-electrode is provided with a first electrode area and a second electrode area along the X axis direction, the first electrode area and the second electrode area are respectively positively charged and negatively charged and alternately orderly arranged in an intersecting way, a first isolation groove is arranged between the two connected sub-electrode areas, each sub-electrode area forms a single power generation unit, transparent conductive film layers are arranged on the first electrode area and the second electrode area, a carrier film layer, a first metal gate line, a second metal gate line and a composite layer are arranged on the metal electrode film, the first electrode area and the second electrode area are alternately arranged in an intersecting way, the first electrode area and the second electrode area are correspondingly arranged on the surface of the second electrode area, a hollow film is arranged on the two end faces of the second electrode area, and the first electrode area and the second electrode area are correspondingly arranged on the surface of the second electrode film, and the second electrode area is correspondingly arranged on the surface of the carrier film, and the second electrode film is simultaneously arranged on the two end faces of the carrier film. Further, when the number of the sub-electrode areas N is even, the battery plate monomers are directly arranged along the Y-axis direction, the plate interval W is 0.2-1mm, when the number of the sub-electrode areas N is odd, the battery plate monomers are arranged along the Y-axis direction, and each arrangement is arranged after being turned 180 degrees, and the plate interval W is 0.2-1mm. Further, the carrier film layer has a material transmittance of more than 85% and is one of PET, PEN, PCT, PC, PETG, PMMA, COC, EVA, POE, EMA, EAA, EMMA, epoxy resin, silicone resin, PMA, PU, VAE, PVB or a composite sheet film thereof. Further, the transmittance of the composite adhesive film layer after hot melting is more than 85%, and the composite adhesive film layer is made of one of TPO, EVA, POE, PVB materials. Further, the cross sections of the first metal grid line and the second metal grid line are one of triangle, trapezoid, semicircle arc, rectangle and square, and the first metal grid line and the second metal gr