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CN-121985628-A - Back contact battery and photovoltaic module

CN121985628ACN 121985628 ACN121985628 ACN 121985628ACN-121985628-A

Abstract

The application discloses a back contact battery and a photovoltaic module, wherein the back contact battery comprises a battery body, the battery body is provided with a first surface and a second surface which are oppositely arranged, a first collecting electrode and a second collecting electrode are arranged on the first surface, the first collecting electrode is provided with a first disconnecting part, a first connecting conductor is arranged on the first surface, at least one first disconnecting part is covered by orthographic projection of the first connecting conductor on the first surface, and the first connecting conductor is electrically connected with the first collecting electrode and is insulated from the second collecting electrode. Therefore, the overlong slit structure on the steel plate screen plate can be avoided, the probability of deformation of the steel plate screen plate is reduced, and the risk of printing broken grids of the first collector electrode is reduced. Meanwhile, the first disconnecting part is electrically connected with the first collecting electrode through the first connecting conductor, so that the problem of welding grid breakage of the first collecting electrode can be avoided. And the first collector electrode adopts partial disconnection arrangement, so that the material cost can be reduced.

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 (13)

  1. 1. A back contact battery, comprising: the 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 electrode and the second collector electrode are sequentially and alternately arranged at intervals along a first direction and extend along a second direction, and the first direction is intersected with the second direction; The first connecting conductor is arranged on the first surface, the orthographic projection of the first connecting conductor on the first surface covers at least one first disconnection part, and the first connecting conductor is electrically connected with the first collecting electrode and insulated from the second collecting electrode.
  2. 2. The back contact battery of claim 1, further comprising a second connection conductor adjacent to the first connection conductor in the second direction, the second collector electrode having a second break, the orthographic projection of the second connection conductor on the first surface covering at least one of the second breaks, the second connection conductor being electrically connected to the second collector electrode and insulated from the first collector electrode.
  3. 3. The back contact battery of claim 2, wherein the back contact battery satisfies at least one of the following conditions: A. The width of the first breaking part in the second direction is 1.5mm-2mm; B. The width of the first connecting conductor in the second direction is 2mm-2.5mm; C. The width of the second breaking part in the second direction is 1.5mm-2mm; D. The width of the second connecting conductor in the second direction is 2mm-2.5mm.
  4. 4. The back contact battery of claim 2, further comprising a first electrical connection provided on the first surface, the portion of the first collector electrode between the first connection conductor and the second connection conductor having a third disconnection portion, the first electrical connection being provided at the third disconnection portion, the third disconnection portion being in communication through the first electrical connection.
  5. 5. The back contact battery of claim 4, 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 a 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.
  6. 6. The back contact battery of claim 5, wherein the back contact battery satisfies at least one of the following conditions: E. the length of the third disconnection part in the second direction is 200-400 mu m; F. the length of the first electric connection part in the second direction is 300-700 mu m; G. 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; H. in the second direction, the first distance between the first breaking part and the third breaking part is 3mm-5mm.
  7. 7. The back contact battery of claim 4, further comprising a second electrical connection provided on the first surface, the portion of the second collector electrode between the first connection conductor and the second connection conductor having a fourth disconnection portion, the second electrical connection being provided at the fourth disconnection portion, the fourth disconnection portion being in communication through the second electrical connection.
  8. 8. The back contact battery of claim 7, wherein an orthographic projection of the third break in the first direction at least partially coincides with an orthographic projection of the fourth break in the first direction; or, the orthographic projection of the third disconnection portion in the first direction is staggered with the orthographic projection of the fourth disconnection portion in the first direction.
  9. 9. The back contact battery of any one of claims 1-8, wherein the first connection conductor extends in the first direction, an orthographic projection of the first connection conductor on the first surface covers a plurality of the first disconnection portions, and the first connection conductor is insulated from the second collecting electrode by an insulation portion.
  10. 10. The back contact battery of any one of claims 1-8, wherein the first connection conductor comprises a first weld and an end connection line, the first surface comprising a middle region and edge regions on either side of the middle region in a first direction; The first welding part is arranged in the edge area and is close to the middle area, the orthographic projection of the first welding part on the first surface covers at least one first disconnecting part, the first welding part is insulated from the second collecting electrode through an insulating part, one end of the end connecting wire is electrically connected with the first welding part, and the other end extends towards the direction far away from the middle area and is electrically connected with at least one first collecting electrode.
  11. 11. The back contact battery of claim 10, wherein the first connection conductor further comprises a plurality of second solder joints, the plurality of second solder joints being disposed in the middle region, a front projection of one of the second solder joints on the first surface corresponding to one of the first break-out joints, the front projection area of the second solder joint on the first surface being smaller than the front projection area of the first solder joint on the first surface.
  12. 12. The back contact battery of claim 11, wherein the first break in the middle region has a first width in the second direction and the first break in the edge region has a second width in the second direction, the first width being greater than the second width.
  13. 13. A photovoltaic module comprising a back contact cell according to any one of claims 1-12.

Description

Back contact battery and photovoltaic module Technical Field The application belongs to the technical field of photovoltaics, and particularly relates to a back contact battery 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 preparation process of the battery, an electrode is usually prepared by adopting a screen printing mode, and the slurry is transferred to the surface of a silicon wafer through meshes by utilizing the hollowed-out pattern of a screen through pressing of a scraper so as to form an electrode structure. The full-opening steel plate screen is adopted to print the electrode, so that the uniformity of the electrode can be improved, and the opening structure in the steel plate screen is designed according to the electrode structure, and the electrode structure of the back contact battery in the prior art is adopted, so that the used steel plate screen is easy to deform, and the printed grid line is easy to break. Disclosure of Invention The application aims to provide a back contact battery and a photovoltaic module, which can solve the problem that the electrode is easy to break due to the fact that a steel plate screen plate used in the electrode structure of the back contact battery in the prior art is easy to deform. 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: the 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 electrode and the second collector electrode are sequentially and alternately arranged at intervals along a first direction and extend along a second direction, and the first direction is intersected with the second direction; The first connecting conductor is arranged on the first surface, the orthographic projection of the first connecting conductor on the first surface covers at least one first disconnection part, and the first connecting conductor is electrically connected with the first collecting electrode and insulated from the second collecting electrode. Optionally, the back contact battery further includes a second connection conductor adjacent to the first connection conductor in the second direction, the second collecting electrode has a second disconnection portion, an orthographic projection of the second connection conductor on the first surface covers at least one of the second disconnection portions, and the second connection conductor is electrically connected to the second collecting electrode and insulated from the first collecting electrode. Optionally, the back contact battery satisfies at least one of the following conditions: A. The width of the first breaking part in the second direction is 1.5mm-2mm; B. The width of the first connecting conductor in the second direction is 2mm-2.5mm; C. The width of the second breaking part in the second direction is 1.5mm-2mm; D. The width of the second connecting conductor in the second direction is 2mm-2.5mm. Optionally, the back contact battery further includes a first electrical connection portion disposed on the first surface, a portion of the first collector electrode between the first connection conductor and the second connection conductor has a third disconnection portion, the first electrical connection portion is disposed at the third disconnection portion, and the third disconnection portion is communicated through the first electrical connection portion. Optionally, the first electrical connection part comprises a first connection section, a second connection section and a third connection section which are sequentially connected, the first connection section and the third connection section are respectively and electrically connected with the first collector electrode, and the width of the first connection section and/or the third connection section is larger than the width of the second connection section in the first direction. Optionally, the back contact battery satisfies at least one of the following conditions: E. the length of the third disconnection part in the second direction is 200-400 mu m; F. the length of the first electric connection part in the second direction is 300-700 mu m; G. 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; H. in the second direction, the first distance between the firs