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CN-122028584-A - Battery pack, photovoltaic string and power generation system

CN122028584ACN 122028584 ACN122028584 ACN 122028584ACN-122028584-A

Abstract

The embodiment of the application provides a battery assembly, a photovoltaic group string comprising the battery assembly and a power generation system comprising the photovoltaic group string, and relates to the technical field of batteries. The battery assembly comprises a plurality of sub-batteries connected in series, wherein each sub-battery comprises a first electrode, a first transmission layer, a light absorption layer, a second transmission layer and a second electrode, and at least one sub-battery further comprises a first groove group, wherein the first groove group comprises a first groove, a second groove and a plurality of third grooves. The first groove is annular and penetrates through the first electrode, the second groove is annular and penetrates through the first transmission layer, the light absorption layer, the second transmission layer and the second electrode, the third grooves penetrate through the first transmission layer, the light absorption layer and the second transmission layer, one third groove is located on the outer side of the second groove, and the other third groove is located on the inner side of the second groove. Through the technical scheme, the hot spot temperature of the shielded sub-battery and the risk of breakdown are effectively reduced.

Inventors

  • LIU DETAO
  • WANG SHUO
  • BI KUN
  • LIU YUNFENG
  • HUANG BONING

Assignees

  • 华为技术有限公司

Dates

Publication Date
20260512
Application Date
20251230

Claims (15)

  1. 1. A battery assembly, characterized by comprising a plurality of sub-cells connected in series, wherein the sub-cells comprise a first electrode, a first transmission layer, a light absorption layer, a second transmission layer and a second electrode which are sequentially stacked along the thickness direction, the light absorption layer is used for converting light energy into electric energy, and the first transmission layer and the second transmission layer are used for transmitting carriers; at least one of the plurality of sub-cells further comprises at least one first slot group comprising: the first groove is annular and penetrates through the first electrode; The second groove is annular and penetrates through the first transmission layer, the light absorption layer, the second transmission layer and the second electrode, and the area surrounded by the first groove and the area surrounded by the second groove are stacked in the thickness direction of the sub-battery; The light absorbing device comprises a first transmission layer, a light absorbing layer, a plurality of third grooves, a second electrode, a third groove, a first electrode, a second electrode, a third groove, a second electrode and a third electrode, wherein the third grooves penetrate through the first transmission layer, the light absorbing layer and the second transmission layer, one third groove of the third grooves is located on the outer side of the second groove, the other third groove of the third grooves is located on the inner side of the second groove, one part of the second electrode is filled in the one third groove and connected with the part of the first electrode located on the inner side of the first groove, and the other part of the second electrode is filled in the other third groove and connected with the part of the first electrode located on the outer side of the first groove.
  2. 2. The battery assembly of claim 1, wherein the one third groove and the another third groove are arranged in a direction parallel to the plurality of subcells.
  3. 3. The battery assembly of claim 2, wherein the first recess and the second recess each comprise a first end and a second end disposed along the plurality of subcell arrangements, wherein in the plurality of subcell arrangements, the second end of the first recess and the first end of the second recess are each located between the first end of the first recess and the second end of the second recess; The one third groove is located between the first end of the first groove and the first end of the second groove, and the other third groove is located between the second end of the first groove and the second end of the second groove.
  4. 4. The battery assembly of any one of claims 1-3, wherein the first groove or the second groove is a rectangular ring and comprises four sub-grooves connected end to end, wherein two of the sub-grooves extend along the arrangement direction of the plurality of sub-cells, and the other two of the sub-grooves extend along the length direction of the sub-cells, and the length direction of the sub-cells is perpendicular to the arrangement direction of the plurality of sub-cells.
  5. 5. The battery assembly of any one of claims 1-4, wherein at least one of the third grooves extends along a length direction of the subcells that is perpendicular to an arrangement direction of the plurality of subcells.
  6. 6. The battery assembly of any one of claims 1-5, wherein the at least one subcell includes a plurality of first groove groups arranged along a length direction of the subcell, the length direction of the subcell being perpendicular to an arrangement direction of the plurality of subcells.
  7. 7. The battery assembly of claim 6, wherein the distance between any two adjacent ones of the plurality of first groove groups is equal.
  8. 8. The battery assembly of any one of claims 1-7, wherein the first and second transmission layers are connected within an area enclosed by the second recess.
  9. 9. The battery assembly of any one of claims 1-7, wherein the at least one sub-cell further comprises a light emitting layer located within the area enclosed by the second recess and connected between the first and second transmission layers, the light emitting layer configured to emit light upon application of a voltage.
  10. 10. The battery assembly of any one of claims 1-9, wherein a portion of the first transmission layer fills the first recess.
  11. 11. The battery assembly of any one of claims 1-10, wherein the battery assembly comprises a battery comprising a plurality of the sub-cells in series, and a bypass diode in anti-parallel with the battery for bypassing the battery if the output current of at least two of the sub-cells of the battery is less than a preset current.
  12. 12. The battery assembly of any one of claims 1-11, further comprising a plurality of second groove sets for dividing the battery assembly into the plurality of sub-cells in series, the at least one first groove set being located between two adjacent second groove sets.
  13. 13. The battery assembly of claim 12 wherein the second groove group includes a fourth groove, a fifth groove and a sixth groove disposed along the arrangement direction of the plurality of subcells, the fourth groove separating first electrodes of adjacent two subcells, the fifth groove separating first transmission layers, light absorbing layers, second transmission layers and second electrodes of adjacent two subcells, the sixth groove being located between the fourth groove and the fifth groove and penetrating the first transmission layers, the light absorbing layers and the second transmission layers of a corresponding one of the subcells, a portion of the second electrodes in the corresponding one of the subcells filling the sixth groove and connecting the first electrodes of an adjacent one of the subcells.
  14. 14. A string of photovoltaic modules comprising a plurality of cell modules according to any one of claims 1 to 13, said plurality of cell modules being connected in series or in parallel.
  15. 15. A power generation system, comprising an inverter and the photovoltaic string according to claim 14, wherein an output end of the photovoltaic string is electrically connected to an input end of the inverter, and the inverter is configured to convert direct current output by the photovoltaic string into alternating current and output the alternating current.

Description

Battery pack, photovoltaic string and power generation system Technical Field The application relates to the technical field of batteries, in particular to a battery assembly, a photovoltaic string and a power generation system. Background Along with the development of solar cells, perovskite cells have been applied to ground power stations and photovoltaic building integration because of the advantages of high theoretical conversion efficiency, low preparation cost, adjustable forbidden band width height and the like. The perovskite battery has a larger area, and in order to reduce the electrical loss caused by the electrodes, a single large-area perovskite battery is often divided into a plurality of sub-batteries which are connected in series by adopting a laser scribing mode. However, in the actual operation process, the perovskite battery can be shielded by other objects, the shielded sub-battery cannot play a role of a photovoltaic battery, and cannot provide a photocurrent, or the provided photocurrent is far smaller than the current of normal operation of other sub-batteries, in order to ensure the optimal power output of other sub-batteries, the shielded sub-battery can be applied with higher reverse bias voltage, so that the sub-battery is quickly attenuated, and a local high temperature (namely a hot spot effect) is generated, and in addition, the shielded sub-battery also has the risk of breakdown, so that the sub-battery is fused or fires, and safety accidents are caused. Disclosure of Invention The application provides a battery assembly, a photovoltaic string comprising the battery assembly and a power generation system comprising the photovoltaic string, wherein the heat spot temperature and the breakdown risk of a shielded sub-battery are effectively reduced by preparing the anti-parallel diode inside the sub-battery. In order to achieve the above purpose, the application adopts the following technical scheme: In a first aspect of the present application, there is provided a battery assembly comprising a plurality of subcells connected in series, the subcells comprising a first electrode, a first transmission layer, a light absorption layer, a second transmission layer and a second electrode stacked in this order in a thickness direction, the light absorption layer being for converting light energy into electric energy, the first transmission layer and the second transmission layer being for transmitting carriers, at least one subcell of the plurality of subcells further comprising at least one first groove group comprising a first groove, a second groove and a plurality of third grooves. The first groove is annular and penetrates through the first electrode, the second groove is annular and penetrates through the first transmission layer, the light absorption layer, the second transmission layer and the second electrode, the area surrounded by the first groove and the area surrounded by the second groove are stacked in the thickness direction of the sub-battery, the third grooves penetrate through the first transmission layer, the light absorption layer and the second transmission layer, one of the third grooves is located at the outer side of the second groove, the other of the third grooves is located at the inner side of the second groove, one part of the second electrode is filled with the third groove and connected with the part of the first electrode located at the inner side of the first groove, and the other part of the second electrode is filled with the other third groove and connected with the part of the first electrode located at the outer side of the first groove. The light absorbing layer of each sub-cell is capable of absorbing sunlight and converting the sunlight into electric energy, and the first groove group on the sub-cell is capable of forming a diode (hereinafter, a "diode portion") in anti-parallel with other portions (hereinafter, a "power generating portion") of the sub-cell on the sub-cell. The first groove and the second groove of the first groove group are annular, the part of the first electrode, which is positioned on the inner side of the first groove, can be separated from the part of the first electrode, which is positioned on the outer side of the first groove, through the first groove, and the part of the first transmission layer, the light absorption layer, the second transmission layer and the second electrode, which is positioned on the inner side of the second groove, can be separated from the part, which is positioned on the outer side of the second groove, through the second groove. That is, the power generation portion and the diode portion in the subcell can be separated by the first groove and the second groove. However, the power generation portion and the diode portion are electrically connected to each other because the first slot group further includes a plurality of third grooves, and the first electrode has some portions filling the plural