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EP-4742860-A1 - PHOTOVOLTAIC MODULE

EP4742860A1EP 4742860 A1EP4742860 A1EP 4742860A1EP-4742860-A1

Abstract

A photovoltaic module is provided and includes cell strings, insulating layers, and bus bars. Each respective cell string of the cell strings includes a plurality of cells sequentially arranged in a first direction, and each respective cell of the plurality of cells is provided with solder ribbons on a back surface of the respective cell and arranged in a second direction intersecting the first direction. A respective insulating layer of the insulating layers is disposed on a side of the solder ribbons away from the respective cell, and the respective insulating layer defines windows, a respective window of the windows to allow an exposed portion of a respective solder ribbon to be exposed through the respective window. A respective bus bar of the bus bars is disposed on a side of the respective insulating layer away from the solder ribbons.

Inventors

  • TAO, Wusong
  • WANG, Luchuang
  • HAN, Xiangchao
  • HU, RONG
  • SONG, Yongqiao
  • LIU, HAIMEI

Assignees

  • JINKO SOLAR CO., LTD
  • Jinko Solar (Haining) Co., Ltd.

Dates

Publication Date
20260513
Application Date
20250421

Claims (15)

  1. A photovoltaic module (1000), comprising: cell strings (100), wherein each respective cell string (100) of the cell strings (100) includes a plurality of cells (110) sequentially arranged in a first direction (X), and each respective cell (110) of the plurality of cells (110) is provided with solder ribbons (200) on a back surface of the respective cell (110) and arranged in a second direction (Y) intersecting the first direction (X), wherein the solder ribbons (200) disposed on the plurality of cells (110) are configured to connect the plurality of cells (110) in series; insulating layers (300), wherein a respective insulating layer (300) of the insulating layers (300) is disposed on a side of the solder ribbons (200) away from the respective cell (110), and the respective insulating layer (300) defines windows (310), a respective window (310) of the windows (310) to allow an exposed portion (210) of a respective solder ribbon (200) to be exposed through the respective window (310); and bus bars (400), wherein a respective bus bar (400) of the bus bars (400) is disposed on a side of the respective insulating layer (300) away from the solder ribbons (200) and extends in the second direction (Y), and the respective bus bar (400) is provided with contact portions (410), wherein a respective contact portion (410) of the contact portions (410) recedes toward and abuts on a corresponding exposed portion (210), to electrically connect the respective bus bar (400) with the respective solder ribbon (200).
  2. The photovoltaic module of claim 1, wherein a corresponding portion of the respective bus bar (400) is recessed toward the corresponding exposed portion (210) with respect to an adjacent portion of the respective bus bar (400) to form the respective contact portion (410).
  3. The photovoltaic module of claim 1 or 2, wherein the respective contact portion (410) is arc-shaped.
  4. The photovoltaic module of claim 1 or 2, wherein the respective contact portion (410) has a size equal to a width of the respective bus bar (400) in the first direction (X).
  5. The photovoltaic module of any of claims 1 to 4, wherein the respective contact portion (410) and the corresponding exposed portion (210) are connected through a conductive adhesive, so that at least a portion of the respective contact portion (410) abuts on the corresponding exposed portion (210) through the conductive adhesive.
  6. The photovoltaic module of any of claims 1 to 5, wherein the respective cell string (100) includes a plurality of exposed portions (210) arranged at intervals in the second direction (Y), the respective bus bar (400) is provided with a plurality of contact portions (410) corresponding to the plurality of exposed portions (210) in the respective cell string (100), and each of the plurality of exposed portions (210) abuts on a corresponding one of the plurality of contact portions (410).
  7. The photovoltaic module of any of claims 1 to 6, wherein the cell strings (100) are arranged in the second direction (Y), and the cell strings (100) are connected in series through the bus bars (400).
  8. The photovoltaic module of any of claims 1 to 7, wherein the respective insulating layer (300) includes a film-coating layer (320), the film-coating layer (320) is disposed on the respective cell string (100), and the film-coating layer (320) coves the solder ribbons (200) and a region of the back surface of the respective cell (110) other than the solder ribbons (200), wherein the film-coating layer (320) defines openings (321), and each of the openings (321) forms the respective window (310); optionally, the film-coating layer (320) includes a plurality of film-coating sublayers (322), the plurality of film-coating sublayers (322) are in one-to-one correspondence with the plurality of cells (110) in the respective cell string (100), and each of the plurality of film-coating sublayers (322) covers the back surface of the respective cell (110).
  9. The photovoltaic module of claim 8, wherein the respective insulating layer (300) further comprises an insulating spacer layer (330), the insulating spacer layer (330) is disposed between the film-coating layer (320) and the respective bus bar (400), and the insulating spacer layer (330) is provided with avoidance structures (331) each communicating with a corresponding opening (321) of the openings (321).
  10. The photovoltaic module of claim 9, wherein the insulating spacer layer (330) is provided in a strip shape and extends in the second direction (Y), the insulating spacer layer (330) defines clearance holes (331a) corresponding to the openings (321), and each of the clearance holes (331a) forms a corresponding avoidance structure (331) of the avoidance structures (331), wherein the respective contact portion (410) extends into a corresponding clearance hole (331a), and the respective contact portion (410) abuts against an inner wall of the corresponding clearance hole (331a) in the second direction (Y); optionally, the insulating spacer layer (330) includes a plurality of insulating sublayers (332) arranged at intervals in the second direction (Y), and each two adjacent insulating sublayers (332) are spaced by the corresponding opening (321) to form the corresponding avoidance structure (331) between the two adjacent insulating sublayers (332), wherein the respective contact portion (410) extends between the two adjacent insulating sublayers (332), and the respective contact portion (410) abuts against the two adjacent insulating sublayers (332) in the second direction (Y).
  11. The photovoltaic module of claim 9, wherein the film-coating layer (320) has thermoplasticity better than that of the insulating spacer layer (330); optionally, the film-coating layer (320) is extended in the first direction (X), and the film-coating layer (320) has a size equal to a length of the respective cell string (100) in the first direction (X).
  12. The photovoltaic module of claim 9, wherein the insulating spacer layer (330) has a thickness in a range of 0.03 mm to 0.2 mm in a direction perpendicular to the back surface of the respective cell (110); optionally, the respective solder ribbon (200) has a thickness less than a sum of a thickness of the film-coating layer (320) and the thickness of the insulating spacer layer (330), and the thickness of the respective solder ribbon (200) is greater than a thickness of the film-coating layer (320), in a direction perpendicular to the back surface of the respective cell (110).
  13. The photovoltaic module of claim 8, wherein an insulating glue (120) is provided between the solder ribbons (200) and the back surface of the respective cell (110), and the insulating glue (120) has a size greater than or equal to a size of a corresponding opening (321) of the openings (321) in second direction (Y); optionally, the corresponding opening (321) of the openings (321) includes a square hole.
  14. The photovoltaic module of any of claims 1 to 13, wherein the respective cell (110) includes first electrodes and second electrodes having different conductive types from the first electrodes on the back surface of the respective cell (110), the solder ribbons (200) include first solder ribbons (200a) and second solder ribbons (200b), and the first solder ribbons (200a) and the second solder ribbons (200b) are alternatingly arranged on the back surface of the respective cell (110) in the second direction (Y), wherein each of the first solder ribbons (200a) is electrically connected to a corresponding first electrode of the first electrodes, and each of the second solder ribbons (200b) is electrically connected to a corresponding second electrode of the second electrodes, wherein the respective insulating layer (300) is configured to insulate the respective bus bar (400) from the first solder ribbons (200a) or the second solder ribbons (200b).
  15. The photovoltaic module of any of claims 1 to 14, wherein a surface of the respective bus bar (400) close to the exposed portions (210) forms protrusions, and each of the protrusions is the respective contact portion (410).

Description

TECHNICAL FIELD The various embodiments described in this document relate in general to the field of photovoltaic technologies, and more specifically to a photovoltaic module. BACKGROUND The back contact (BC) cell includes no electrodes on the front side of the BC cell, which can maximize the use of incident light, reduce optical loss, and have a higher short-circuit current, thereby improving the maximum output power of the BC cell and related modules. In existing BC cell module, the BC cell module still has bus bars on the front side of the BC cell module, and the bus bars occupy part of an area of the front side of the module, thereby reducing the area for arrangement of the cells, and severely limiting the maximum output power of the BC cell module. SUMMARY Embodiments of the disclosure provide a photovoltaic module, which is at least conducive to improving the maximum output power of back contact cell modules. According to an aspect, embodiments of the disclosure provide a photovoltaic module. The photovoltaic module includes cell strings, insulating layers, and bus bars. Each respective cell string of the cell strings includes a plurality of cells sequentially arranged in a first direction, and each respective cell of the plurality of cells is provided with solder ribbons on a back surface of the respective cell and arranged in a second direction intersecting the first direction, where the solder ribbons disposed on the plurality of cells are configured to connect the plurality of cells in series. A respective insulating layer of the insulating layers is disposed on a side of the solder ribbons away from the respective cell, and the respective insulating layer defines windows, a respective window of the windows to allow an exposed portion of a respective solder ribbon to be exposed through the respective window. A respective bus bar of the bus bars is disposed on a side of the respective insulating layer away from the solder ribbons and extends in the second direction, and the respective bus bar is provided with contact portions, where a respective contact portion of the contact portions recedes toward and abuts on a corresponding exposed portion, to electrically connect the respective bus bar with the respective solder ribbon. In some embodiments, a corresponding portion of the respective bus bar is recessed toward the corresponding exposed portion with respect to an adjacent portion of the respective bus bar to form the respective contact portion. In some embodiments, the respective contact portion is arc-shaped. In some embodiments, the respective contact portion has a size equal to a width of the respective bus bar in the first direction. In some embodiments, the respective contact portion and the corresponding exposed portion are connected through a conductive adhesive, so that at least a portion of the respective contact portion abuts on the corresponding exposed portion through the conductive adhesive. In some embodiments, the respective cell string includes a plurality of exposed portions arranged at intervals in the second direction, the respective bus bar is provided with a plurality of contact portions corresponding to the plurality of exposed portions in the respective cell string, and each of the plurality of exposed portions abuts on a corresponding one of the plurality of contact portions. In some embodiments, the cell strings are arranged in the second direction, and the cell strings are connected in series through the bus bars. In some embodiments, the respective insulating layer includes a film-coating layer, the film-coating layer is disposed on the respective cell string, and the film-coating layer covers the solder ribbons and a region of the back surface of the respective cell other than the solder ribbons, where the film-coating layer defines openings, and each of the openings forms the respective window. In some embodiments, the respective insulating layer further includes an insulating spacer layer, the insulating spacer layer is disposed between the film-coating layer and the respective bus bar, and the insulating spacer layer is provided with avoidance structures each communicating with a corresponding opening of the openings. In some embodiments, the insulating spacer layer is provided in a strip shape and extends in the second direction, the insulating spacer layer defines clearance holes corresponding to the openings, and each of the clearance holes forms a corresponding avoidance structure of the avoidance structures, where the respective contact portion extends into a corresponding clearance hole, and the respective contact portion abuts against an inner wall of the corresponding clearance hole in the second direction. In some embodiments, the insulating spacer layer includes a plurality of insulating sublayers arranged at intervals in the second direction, and each two adjacent insulating sublayers are spaced by the corresponding opening to form the corresponding avoid