Photovoltaic solar cell, solar cell module and manufacturing process

Patent metadata

Field	Value
Publication number	US-12446355-B2
Application number	US-202318235152-A
Country	US
Kind code	B2
Filing date	Aug 17, 2023
Priority date	Aug 27, 2021
Publication date	Oct 14, 2025
Grant date	Oct 14, 2025

Abstract

Provided is a photovoltaic solar cell, a solar cell module and a manufacturing process. The photovoltaic solar cell includes a silicon substrate, and a passivation layer located on at least one surface of the silicon substrate. An electrode, an electrode pad and an extension line are printed on at least one surface of the silicon substrate. The electrode includes a busbar and a finger crossed with each other, and the finger is in contact with the silicon substrate. Two ends of the extension line are respectively connected to the busbar and the electrode pad, to reinforce a connection between the busbar and the electrode pad such that the extension line is not in direct contact with the finger, the extension line is in contact with the passivation layer, the electrode pad and the busbar are not in direct contact with the silicon substrate.

First claim

What is claimed is:

1. A photovoltaic solar cell, comprising:
a silicon substrate;
a passivation layer located on at least one surface of the silicon substrate; and
an electrode, an electrode pad, and an extension line printed on at least one surface of the silicon substrate,
wherein the electrode comprises a busbar and a finger crossed with each other, and the finger is in contact with the silicon substrate, and
wherein two ends of the extension line are respectively connected to the busbar and the electrode pad to reinforce a connection between the busbar and the electrode pad such that the extension line is not in direct contact with the finger, the extension line is in direct contact with the passivation layer, the electrode pad is not in direct contact with the silicon substrate, and the busbar is not in direct contact with the silicon substrate.

2. The photovoltaic solar cell according to claim 1 , wherein a size of the extension line is less than or equal to 3 times of a size of the electrode pad in a direction of an elongation line of the busbar.

3. The photovoltaic solar cell according to claim 1 , wherein a partial region of the extension line overlaps with the busbar, and a size of an overlapping region of the extension line and the busbar is less than 0.1 mm in a direction of an elongation line of the busbar, or
wherein a partial region of the extension line overlaps with the electrode pad, and a size of an overlapping region of the extension line and the electrode pad is less than 0.1 mm in the direction of an elongation line of the busbar.

4. The photovoltaic solar cell according to claim 1 , wherein a width of the extension line is 1 to 2 times of a width of the busbar.

5. The photovoltaic solar cell according to claim 1 , wherein the extension line has a profiled shape with a wider end connected to the electrode pad and a narrower end connected to the busbar.

6. The photovoltaic solar cell according to claim 1 , wherein the extension line has one of a rectangular shape, a trapezoidal shape, an elliptic shape, an oval shape, a diamond shape, an H shape, and a Y shape or a combination thereof.

7. The photovoltaic solar cell according to claim 1 , wherein a height of the extension line decreases gradually along a direction from the electrode pad to the busbar.

8. The photovoltaic solar cell according to claim 1 , wherein a height of the busbar is less than or equal to 8 μm.

9. The photovoltaic solar cell according to claim 1 , wherein the photovoltaic solar cell is an N-type solar cell, and the silicon substrate is an N-type silicon substrate, and
wherein an electrode on a front surface of the silicon substrate has a width smaller than an electrode on a rear surface of the silicon substrate.

10. The photovoltaic solar cell according to claim 9 , wherein a height of the electrode pad is smaller than a height of the busbar.

11. The photovoltaic solar cell according to claim 9 , wherein a height of the electrode pad is greater than or equal to 5 μm and less than or equal to 7 μm.

12. The photovoltaic solar cell according to claim 9 , wherein an orthogonal projection of an electrode pad of the front surface on the silicon substrate is not overlapping with an orthogonal projection of an electrode pad of the rear surface on the silicon substrate.

13. The photovoltaic solar cell according to claim 9 , wherein the electrode pad has a hollow region and, in a direction parallel to the silicon substrate, an area of the hollow region is less than 30% of a total area of the electrode pad.

14. The photovoltaic solar cell according to claim 13 , wherein the area of a non-hollow region of the electrode pad is less than or equal to 0.3 mm2.

15. The photovoltaic solar cell according to claim 9 , wherein a dimension of the electrode pad in a direction perpendicular to the busbar is greater than a dimension the electrode pad in a direction parallel to the busbar.

16. The photovoltaic solar cell according to claim 9 , further comprising a plurality of busbars, wherein a number of the plurality of busbars is greater than or equal to 9 and less than or equal to 18.

17. A photovoltaic module, comprising a glass, a first film material, a photovoltaic cell string, a second film material and a back sheet sequentially from front to back, wherein the photovoltaic cell string comprises a plurality of photovoltaic solar cells, and at least one of the plurality of photovoltaic solar cells comprises:
a silicon substrate;
a passivation layer located on at least one surface of the silicon substrate; and
an electrode, an electrode pad, and an extension line printed on at least one surface of the silicon substrate,
wherein the electrode comprises a busbar and a finger crossed with each other, and the finger is in contact with the silicon substrate, and
wherein two ends of the extension line are respectively connected to the busbar and the electrode pad to reinforce a connection between the busbar and the electrode pad such that the extension line is not in direct contact with the finger, the extension line is in direct contact with the passivation layer, the electrode pad is not in direct contact with the silicon substrate, and the busbar is not in direct contact with the silicon substrate.

18. The photovoltaic module according to claim 17 , wherein the plurality of photovoltaic solar cells are connected through a conductive line, and the conductive line has a diameter in a range of 0.2 mm to 0.3 mm.

19. A manufacturing process for manufacturing a photovoltaic solar cell, the photovoltaic solar cell comprising:
a silicon substrate;
a passivation layer located on at least one surface of the silicon substrate; and
an electrode, an electrode pad, and an extension line printed on at least one surface of the silicon substrate,
wherein the electrode comprises a busbar and a finger crossed with each other, and the finger is in contact with the silicon substrate, and
wherein two ends of the extension line are respectively connected to the busbar and the electrode pad to reinforce a connection between the busbar and the electrode pad such that the extension line is not in direct contact with the finger, the extension line is in direct contact with the passivation layer, the electrode pad is not in direct contact with the silicon substrate, and the busbar is not in direct contact with the silicon substrate,
the manufacturing process comprising:
providing a photovoltaic substrate having the passivation layer on the at least one surface of the silicon substrate;
printing the electrode pad, the busbar and the extension line on the photovoltaic substrate by using a non fire-through paste, to enable the extension line to be connected to the electrode pad and the busbar, respectively; and
printing the finger on the photovoltaic substrate by using a fire-through paste.

20. The manufacturing process according to claim 19 , wherein the fire-through paste includes a solid with a content of 88% to 92%, an organic matter with a content of 2% to 6%, and a glass powder with a content of 2% to 6%, and
wherein the solid includes a silver powder with a content of 90% to 92%, an aluminum powder with a content of 2% to 6%, and rare earth with a content of 2% to 6%.

Assignees

• Shanghai Jinko Green Energy Enterprise Man Co Ltd
• Zhejiang Jinko Solar Co Ltd

Inventors

• Yan Xunlei
• Yu Kun
• Liu Changming
• Zhang Xinyu

Classifications

• H10F77/20

  Electrodes · CPC title

• H10F71/00

  Manufacture or treatment of devices covered by this subclass (patterning processes to connect thin photovoltaic cells in integrated devices, or assemblies of multiple devices, having photovoltaic cells H10F19/33; manufacture or treatment of encapsulations or containers for integrated devices, or assemblies of multiple devices, having photovoltaic cells H10F19/80; manufacture or treatment of integrated devices, or assemblies of multiple devices, comprising at least one element in which radiation controls the flow of current H10F39/00) · CPC title

• H10F77/311

  for photovoltaic cells · CPC title

• H10F77/937 Primary

  Busbar structures for modules · CPC title

• H10F77/215 Primary

  Geometries of grid contacts · CPC title