CN-122002945-A - Solar cell, preparation method thereof and photovoltaic device

CN122002945ACN 122002945 ACN122002945 ACN 122002945ACN-122002945-A

Abstract

The invention provides a solar cell, a preparation method thereof and photovoltaic equipment. The method for manufacturing the solar cell comprises the steps of forming a patterned conductive seed layer on a light facing surface and/or a backlight surface of a cell body, fixing a conductive wire on one side, far away from the cell body, of the patterned conductive seed layer, forming a preset gap between the conductive wire and the patterned conductive seed layer, and electroplating at the preset gap to form a conductive connecting layer, wherein the conductive connecting layer is in contact connection with the patterned conductive seed layer and the conductive wire. In the method for preparing the solar cell, the conductive connecting layer is formed between the conductive wire and the patterned conductive seed layer through electroplating, so that the conductive wire and the conductive connecting layer and the patterned conductive seed layer are electrically connected through contact, and a low-temperature electroplating process is adopted to replace a high-temperature welding process, so that negative influence of high temperature in the welding process on the cell can be effectively avoided.

Inventors

ZHANG LI
HUANG GENGWEN
WANG SHENCUN
SUN GUOLIANG
JIANG WEIPENG

Assignees

协鑫集成科技股份有限公司
合肥协鑫集成新能源科技有限公司

Dates

Publication Date: 20260508
Application Date: 20251225

Claims (10)

1. A method of making a solar cell, comprising: forming a patterned conductive seed layer on the light facing surface and/or the backlight surface of the battery body; Fixing a conductive wire on one side of the patterned conductive seed layer far away from the battery body, wherein a preset gap is reserved between the conductive wire and the patterned conductive seed layer; and electroplating at the preset gap to form a conductive connecting layer, wherein the conductive connecting layer is in contact connection with the patterned conductive seed layer and the conductive wire.
2. The method of claim 1, wherein the method of securing the conductive filaments comprises: providing a mold, wherein the mold is provided with a concave area, and the bottom of the concave area is provided with at least one groove; The conductive wires are arranged in the grooves, wherein a height difference exists between the surface of the conductive wires facing the battery main body and the bottom of the concave area, the surface of the conductive wires does not exceed the bottom surface of the concave area, the battery main body is arranged in the concave area and is attached to the bottom plane of the concave area, and the preset gap exists between the conductive wires and the patterned conductive seed layer.
3. The method of claim 1, wherein the conductive filament acts as a cathode, and the conductive connection layer is grown from the conductive filament to the conductive seed layer until the conductive connection layer is connected to the patterned conductive seed layer.
4. The method of claim 1, wherein the patterned conductive seed layer serves as a cathode, and the conductive connection layer is grown from the patterned conductive seed layer to the conductive filaments until the conductive connection layer is connected to the conductive filaments.
5. The method of claim 2, wherein the conductive connection layer covers a surface of the conductive filaments proximate the battery body.
6. The method of claim 3, wherein the orthographic projection of the conductive connection layer on the battery body is within the orthographic projection of the patterned conductive seed layer on the battery body.
7. The method according to any one of claims 1 to 5, wherein a pitch of the predetermined gap is equal to a thickness of the conductive connection layer.
8. The method according to any one of claims 1 to 5, wherein the thickness of the conductive connection layer is 20 to 200 microns and/or the material of the conductive connection layer comprises at least one of copper and silver.
9. A solar cell prepared by the method of any one of claims 1 to 8.
10. A photovoltaic device comprising the solar cell of claim 9.

Description

Solar cell, preparation method thereof and photovoltaic device Technical Field The invention relates to the technical field of solar cells, in particular to a solar cell, a preparation method thereof and photovoltaic equipment. Background In order to reduce the power generation loss of the solar cell, a current collection path can be designed through a stacked grid technology, the stacked grid cell creatively combines a grid line and a welding belt, specifically, a seed layer can be printed on the surface of the cell, and then a thin conductive wire and the seed layer are welded in a welding mode. The thin conductive wires of the two cells are connected to transmit current between the two cells. The current transmission path of the stacked gate solar cell is that the current is transmitted to the seed layer through the semiconductor of the solar cell, then is directly transmitted to the thin conductive wire through the seed layer, and then is transmitted along the thin conductive wire. The stacked gate technology shortens the current transmission path, reduces the current transmission loss and improves the conversion efficiency of the photovoltaic module. However, the stacked gate technology utilizes a high-temperature welding mode to weld and connect the thin conductive wires with the seed layer, and the high-temperature welding technology can bring negative effects to the solar cell, such as a large amount of residual thermal stress, and the risk of easy breakage of welding spots. Disclosure of Invention The present invention aims to solve at least one of the technical problems in the related art to some extent. Therefore, an object of the present invention is to provide a method for manufacturing a solar cell, in which connection of a conductive wire and a conductive seed layer by a low-temperature electroplating process is helpful for improving performance of the solar cell. In one aspect of the invention, the invention provides a method of making the solar cell described above. According to the embodiment of the invention, the method for preparing the solar cell comprises the steps of forming a patterned conductive seed layer on a light facing surface and/or a backlight surface of a cell body, fixing a conductive wire on one side of the patterned conductive seed layer far away from the cell body, wherein a preset gap is reserved between the conductive wire and the patterned conductive seed layer, and electroplating at the preset gap to form a conductive connecting layer, wherein the conductive connecting layer is in contact connection with the patterned conductive seed layer and the conductive wire. In the method for preparing the solar cell, the conductive connecting layer is formed between the conductive wire and the patterned conductive seed layer through electroplating, so that the conductive wire and the conductive connecting layer and the patterned conductive seed layer are electrically connected through contact, and a low-temperature electroplating process is adopted to replace a high-temperature welding process, so that negative influence of high temperature in the welding process on the cell can be effectively avoided. According to an embodiment of the invention, the method for fixing the conductive wire comprises the steps of providing a die, wherein the die is provided with a concave area, at least one groove is formed in the bottom of the concave area, the conductive wire is arranged in the groove, a height difference exists between the surface of the conductive wire facing the battery body and the bottom of the concave area, the surface of the conductive wire does not exceed the bottom surface of the concave area, the battery body is arranged in the concave area and is attached to the bottom plane of the concave area, and the preset gap exists between the conductive wire and the patterned conductive seed layer. According to an embodiment of the invention, the conductive filaments act as cathodes, and the conductive connection layer is grown from the conductive filaments towards the conductive seed layer until the conductive connection layer is connected with the patterned conductive seed layer. According to an embodiment of the present invention, the patterned conductive seed layer is used as a cathode, and the conductive connection layer is grown from the patterned conductive seed layer to the conductive wire until the conductive connection layer is connected with the conductive wire. According to an embodiment of the present invention, the conductive connection layer covers a surface of the conductive wire close to the battery body. According to an embodiment of the invention, the orthographic projection of the conductive connection layer on the battery body is located within the orthographic projection of the patterned conductive seed layer on the battery body. According to an embodiment of the present invention, the pitch of the predetermined gap is equal to the thickness of the conduc