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CN-121985627-A - Back contact battery, preparation method thereof and photovoltaic module

CN121985627ACN 121985627 ACN121985627 ACN 121985627ACN-121985627-A

Abstract

The application discloses a back contact battery, a preparation method thereof and a photovoltaic module, wherein the back contact battery comprises a battery body, a first electrode and a second electrode, wherein the battery body is provided with a first surface and a second surface which are oppositely arranged; the first collector electrodes and the second collector electrodes are arranged on the first surface, the first collector electrodes and the second collector electrodes are alternately arranged at intervals along the first direction and extend along the second direction, the first collector electrodes are provided with first insulating parts, the second collector electrodes are provided with second insulating parts, the first insulating parts and the second insulating parts are arranged at intervals along the second direction, the first connecting conductors are arranged on the second insulating parts, the first connecting conductors extend along the first direction and are electrically connected with the first collector electrodes, and the first electric connecting parts are arranged between the first insulating parts and the second insulating parts and are electrically connected with the first collector electrodes. The electrode structure of the application is convenient for the design of the opening structure in the screen, can simplify the processing steps and improves the preparation efficiency of the electrode.

Inventors

  • DOU SHIHAO
  • PENG FUGUO
  • DONG HAIBIN
  • FENG CHUNNUAN

Assignees

  • 嘉兴隆基光伏科技有限公司

Dates

Publication Date
20260505
Application Date
20251224

Claims (16)

  1. 1. A back contact battery, comprising: a battery body having a first surface and a second surface disposed opposite to each other; The first collector electrodes and the second collector electrodes are arranged on the first surface, alternately arranged at intervals along a first direction, and extend along a second direction, and the first direction is intersected with the second direction; a first insulating part is arranged on the first collector electrode, a second insulating part is arranged on the second collector electrode, and the first insulating part and the second insulating part are arranged at intervals in the second direction; a first connection conductor provided on the second insulating portion, the first connection conductor extending in the first direction and electrically connected to the plurality of first collector electrodes; And a first electrical connection part which is arranged between the first insulation part and the second insulation part and is electrically connected with the first collector electrode.
  2. 2. The back contact battery of claim 1, further comprising a first weld provided on the first surface, the first weld electrically connected to at least one of the first collector electrodes, and a portion of the first weld extending to the immediately adjacent second insulating portion.
  3. 3. The back contact battery of claim 2, wherein the first surface includes a middle region and edge regions located at both sides of the middle region in the first direction, the first welding portion is disposed at one side of the edge region near the middle region, one end of the first connection conductor is electrically connected to the first welding portion, and the other end of the first connection conductor extends toward a direction away from the middle region.
  4. 4. The back contact battery of claim 3, further comprising a second weld disposed in the middle region, the second weld being located between two adjacent second insulating portions in the first direction, one of the second welds being electrically connected to one of the first collector electrodes, an orthographic projection area of the second weld on the first surface being smaller than an orthographic projection area of the first weld on the first surface.
  5. 5. The back contact battery of claim 4, wherein the first collector electrode has a first break, and wherein an orthographic projection of the second weld on the first surface covers the first break.
  6. 6. The back contact battery of claim 1, wherein a portion of the first collector electrode between the first insulating portion and the second insulating portion has a second disconnection portion, the first electrical connection portion being provided at the second disconnection portion, the second disconnection portion being communicated through the first electrical connection portion.
  7. 7. The back contact battery of claim 6, wherein the first electrical connection portion comprises a first connection section, a second connection section, and a third connection section connected in sequence, the first connection section and the third connection section being electrically connected to the first collector electrode, respectively, and wherein a width of the first connection section and/or the third connection section is greater than a width of the second connection section in the first direction.
  8. 8. The back contact battery of claim 7, wherein the back contact battery satisfies at least one of the following conditions: A. the length of the first electric connection part in the second direction is 0.3mm-1mm; B. The length of the second breaking part in the second direction is 200-400 mu m; C. The first electrical connection part and the first collector electrode are at least partially overlapped to form an overlapped part, and the length of the overlapped part in the second direction is 100-500 mu m; D. The width of the first connection section in the first direction is 60-120 μm; E. the width of the third connection section in the first direction is 60-120 μm.
  9. 9. The back contact battery of claim 1, wherein the first electrical connection is of unitary construction with the first collector electrode.
  10. 10. The back contact battery of any one of claims 1-9, further comprising: a second connection conductor provided on the first insulating portion, the second connection conductor extending in the first direction and electrically connected to the plurality of second collector electrodes; and the second electric connection part is arranged between the first insulating part and the second insulating part, and is electrically connected with the second collecting electrode.
  11. 11. The back contact battery of claim 10, wherein a portion of the second collector electrode between the first insulating portion and the second insulating portion has a third disconnection portion, the second electrical connection portion being provided at the third disconnection portion, the third disconnection portion being communicated through the second electrical connection portion.
  12. 12. A method for producing a back contact battery according to any one of claims 1 to 11, comprising: providing a battery body, wherein the battery body is provided with a first surface and a second surface which are oppositely arranged; printing a first collector electrode and a second collector electrode on the first surface, wherein the first collector electrode and the second collector electrode are sequentially alternately arranged at intervals along a first direction and extend along a second direction, and the first direction is intersected with the second direction; forming an insulating part on the first collector electrode and the first collector electrode, wherein the insulating part comprises a first insulating part arranged on the first collector electrode and a second insulating part arranged on the second collector electrode, and the first insulating part and the second insulating part are arranged at intervals in the second direction; And printing and forming a first connecting conductor and a first electric connecting part on the first surface, wherein the first connecting conductor is positioned on the second insulating part, extends along the first direction and is electrically connected with a plurality of first collector electrodes, and the first electric connecting part is arranged between the first insulating part and the second insulating part and is electrically connected with the first collector electrodes.
  13. 13. The method of manufacturing according to claim 12, wherein printing the first surface to form the first collector electrode and the second collector electrode comprises: Printing a first collecting electrode, a second collecting electrode and a first mark on the first surface; and calibrating the printing positions of the first collecting electrode and the second collecting electrode based on the first mark.
  14. 14. The method of manufacturing according to claim 12, wherein the forming of the insulating portion on the first collector electrode and the first collector electrode includes: Printing an insulating part on the first collector electrode and the first collector electrode, and processing and printing a second mark on the first surface; And calibrating the printing position of the insulating part based on the second mark.
  15. 15. The method of manufacturing according to claim 12, wherein printing the first connection conductor and the first electrical connection portion on the first surface comprises: printing a first connecting conductor, a first electric connecting part and a third mark on the first surface; and calibrating the printing positions of the first connecting conductor and the first electric connecting part based on the third mark.
  16. 16. A photovoltaic module comprising a back contact cell according to any one of claims 1-11.

Description

Back contact battery, preparation method thereof and photovoltaic module Technical Field The application belongs to the technical field of photovoltaics, and particularly relates to a back contact battery, a preparation method thereof and a photovoltaic module. Background The Back Contact (BC) cell is a solar cell in which both the PN junction and the metal electrode are disposed on the Back surface of the solar cell, and the front surface of the solar cell is not shielded by the electrode, so that the area of the cell absorbing sunlight is increased, and the photoelectric conversion efficiency of the cell can be improved. In the process of solar cells, a screen printing process is generally adopted to prepare an electrode structure, and as positive and negative electrodes of a back contact cell are all arranged on the back of the cell, the electrode structure is densely arranged, and a screen structure is designed according to the electrode structure, so that the reliability of the printed electrode structure is ensured, and meanwhile, the printing efficiency is improved. Disclosure of Invention The application aims to provide a back contact battery, a preparation method thereof and a photovoltaic module, which can solve the problems that the electrode structure of the existing back contact battery is complex and the printing preparation is inconvenient. In order to solve the technical problems, the application is realized as follows: in a first aspect, an embodiment of the present application provides a back contact battery, including: a battery body having a first surface and a second surface disposed opposite to each other; The first collector electrodes and the second collector electrodes are arranged on the first surface, alternately arranged at intervals along a first direction, and extend along a second direction, and the first direction is intersected with the second direction; a first insulating part is arranged on the first collector electrode, a second insulating part is arranged on the second collector electrode, and the first insulating part and the second insulating part are arranged at intervals in the second direction; a first connection conductor provided on the second insulating portion, the first connection conductor extending in the first direction and electrically connected to the plurality of first collector electrodes; And a first electrical connection part which is arranged between the first insulation part and the second insulation part and is electrically connected with the first collector electrode. In a second aspect, an embodiment of the present application provides a method for preparing a back contact battery, which is used for preparing the back contact battery in the first aspect, including: providing a battery body, wherein the battery body is provided with a first surface and a second surface which are oppositely arranged; printing a first collector electrode and a second collector electrode on the first surface, wherein the first collector electrode and the second collector electrode are sequentially alternately arranged at intervals along a first direction and extend along a second direction, and the first direction is intersected with the second direction; forming an insulating part on the first collector electrode and the first collector electrode, wherein the insulating part comprises a first insulating part arranged on the first collector electrode and a second insulating part arranged on the second collector electrode, and the first insulating part and the second insulating part are arranged at intervals in the second direction; And printing and forming a first connecting conductor and a first electric connecting part on the first surface, wherein the first connecting conductor is positioned on the second insulating part, extends along the first direction and is electrically connected with a plurality of first collector electrodes, and the first electric connecting part is arranged between the first insulating part and the second insulating part and is electrically connected with the first collector electrodes. In a third aspect, an embodiment of the present application provides a photovoltaic module, including the back contact battery of the first aspect. In the embodiment of the application, the first collecting electrode and the second collecting electrode are arranged on the first surface to avoid shielding the second surface, the first insulating part is arranged on the first collecting electrode, the second insulating part is arranged on the second collecting electrode, and further the first connecting conductor extending along the first direction is arranged on the second insulating part, so that the electric connection between the first connecting conductor and the first collecting electrodes and the insulating isolation between the first connecting conductor and the second collecting electrode are realized, the first connecting conductor is used for collec