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CN-122028539-A - Back contact battery string production process, photovoltaic module production process, back contact battery string and photovoltaic module

CN122028539ACN 122028539 ACN122028539 ACN 122028539ACN-122028539-A

Abstract

The invention relates to the technical field of photovoltaic modules, in particular to a production process of a back contact battery string and a photovoltaic module, the back contact battery string and the photovoltaic module. The back contact battery string production process comprises a sheet arranging step and a string forming step. In the photovoltaic module production process, the photovoltaic module comprises a battery string produced by the back contact battery string production process. In the back contact battery string, the back contact battery string comprises a first string structure and a second string structure, and the first string structure is connected with the second string structure through a splicing welding strip. In the photovoltaic module, the photovoltaic module comprises the back contact battery string. The invention provides a back contact battery string production process, a photovoltaic module production process, a back contact battery string and a photovoltaic module, which are used for relieving the technical problems that the production process of the battery string is complex, the cold welding is easy, and the photovoltaic module is easy to crack due to the stress problem in the battery string.

Inventors

  • YANG QING
  • WANG PENG

Assignees

  • TCL中环新能源科技股份有限公司

Dates

Publication Date
20260512
Application Date
20260213

Claims (15)

  1. 1. A back contact battery string production process, comprising: arranging a plurality of battery pieces (2) for forming the battery string (1) along a first direction in sequence; A stringing step, wherein adjacent battery pieces (2) are connected through welding strips; The welding strip at least comprises a splicing welding strip (6), the splicing welding strip (6) is projected inside the battery string (1), the splicing welding strip (6) is provided with a tilting section (63) which is tilted relative to the battery piece (2), and a first accommodating space (64) for accommodating the middle bus bar (7) is formed between the tilting section (63) and the battery piece (2).
  2. 2. The back contact battery string production process according to claim 1, wherein the tilting angle between the tilting section (63) and the battery piece (2) is smaller than 90 ° and/or the length of the tilting section (63) is not smaller than 5mm.
  3. 3. The back contact battery string production process according to claim 1, wherein the battery pieces (2) comprise a first battery piece (21) positioned at two ends of the battery string and two second battery pieces (22) positioned between the two first battery pieces (21), and the two second battery pieces (22) are adjacently arranged; The splice welding strip (6) further comprises a first connecting section (61) and a second connecting section (62) which are connected, and the tilting section (63) is connected to one side, far away from the first connecting section (61), of the second connecting section (62); the first connecting section (61) and the second connecting section (62) are respectively connected with the two second battery pieces (22).
  4. 4. A process for producing a string of back-contact cells according to claim 3, wherein the cells (2) further comprise a number of third cells (23) located between the first cells (21) and the second cells (22), the tilting section (63) being tilted with respect to the third cells (23) such that the first receiving space (64) is formed between the tilting section (63) and the third cells (23).
  5. 5. The back contact battery string production process according to claim 4, wherein the solder strip further comprises a connection solder strip (5), and the connection solder strip (5) connects between the first battery piece (21) and the third battery piece (23), between adjacent third battery pieces (23), and between the third battery piece (23) and the second battery piece (22).
  6. 6. The back contact battery string production process according to claim 4, wherein the first battery piece (21) is provided with a bus bar (3) for connecting an end bus bar (4); The busbar (3) comprises a first welding section (31) and a second welding section (32) which are connected, wherein the first welding section (31) is connected with the first battery piece (21) and projects into the first battery piece (21), and the second welding section (32) is used for connecting an end busbar (4) and projects into the third battery piece (23).
  7. 7. The back contact battery string production process according to claim 6, wherein the second soldering section (32) is tilted with respect to the third battery piece (23) such that a second accommodation space (33) for accommodating the end bus bar (4) is formed between the second soldering section (32) and the third battery piece (23).
  8. 8. The back contact battery string production process according to claim 6, wherein the tilting angle between the second soldering section (32) and the third battery piece (23) is smaller than 90 °, and/or the length of the second soldering section (32) is not smaller than 5mm.
  9. 9. A process for producing a photovoltaic module, characterized in that the photovoltaic module comprises a cell string (1) produced by the back contact cell string production process according to any one of claims 1 to 8; the photovoltaic module production process comprises the following steps: A string arranging step, namely arranging a plurality of battery strings (1) in sequence along a second direction, so that first accommodating spaces (64) of the battery strings (1) form a first accommodating area together, wherein the second direction and the first direction form an included angle; And welding an intermediate bus bar (7), namely sequentially arranging an intermediate insulating bar (71) and the intermediate bus bar (7) at the first accommodating area, electrically isolating the intermediate bus bar (7) from the second string structure (12) through the intermediate insulating bar (71), and welding the tilting section (63) and the intermediate bus bar (7).
  10. 10. The photovoltaic module production process according to claim 9, wherein in the step of arranging the plurality of cell strings (1) in the second direction in order, it is also possible to form a second accommodation area together with the second accommodation spaces (33) of the plurality of cell strings (1); the photovoltaic module production process further comprises the following steps: and welding an end bus bar (4), namely arranging an end insulating bar (41) and the end bus bar (4) in sequence at the second accommodating area, electrically isolating the end bus bar (4) from the middle battery piece (22) through the end insulating bar (41), and welding the second welding section (32) and the end bus bar (4).
  11. 11. The back contact battery string is characterized by comprising a plurality of battery pieces (2), wherein the battery pieces (2) are sequentially arranged along a first direction, and adjacent battery pieces (2) are connected through welding strips; The welding strip at least comprises a splicing welding strip (6), and the splicing welding strip (6) is projected to the inside of the battery string (1).
  12. 12. The back contact battery string according to claim 11, wherein the battery pieces (2) comprise a first battery piece (21) located at both ends of the battery string (1), two second battery pieces (22) located between the two first battery pieces (21), and a number of third battery pieces (23) located between the first battery pieces (21) and the second battery pieces (22), the two second battery pieces (22) being adjacently disposed; the splice welding strip (6) comprises a first connecting section (61), a second connecting section (62) and a tilting section (63) which are sequentially connected, wherein the first connecting section (61) and the second connecting section (62) are respectively connected with two second battery pieces (22), and are projected to the inside of the second battery pieces (22), and the tilting section (63) is projected to the inside of the third battery piece (23).
  13. 13. The back contact battery string according to claim 12, wherein the solder strip further comprises a connection solder strip (5), the first battery piece (21) and the third battery piece (23), between adjacent third battery pieces (23), and between the third battery piece (23) and the second battery piece (22) being connected by the connection solder strip (5); And/or be provided with on the first battery piece (21) and be used for connecting the bus bar (4) of tip and weld area (3), the bus bar (3) including first welded section (31) and the second welded section (32) that are connected, first welded section (31) connect in the inside of first battery piece (21), and projection in the inside of first battery piece (21), second welded section (32) are used for connecting tip bus bar (4), and projection in the inside of third battery piece (23).
  14. 14. The photovoltaic module is characterized by comprising a plurality of back contact battery strings according to any one of claims 11-13, wherein the plurality of back contact battery strings are sequentially arranged along a second direction, and the second direction and the first direction form an included angle; And a plurality of third battery pieces (23) of the back contact battery strings are sequentially provided with an intermediate insulating strip (71) and an intermediate bus bar (7), so that the intermediate bus bar (7) is electrically isolated from the plurality of third battery pieces (23) through the intermediate insulating strip (71), and a plurality of tilting sections (63) on the back contact battery strings are connected with the intermediate bus bar (7).
  15. 15. The photovoltaic module according to claim 14, wherein in the plurality of back contact cell strings, an end insulating bar (41) and an end bus bar (4) are sequentially disposed on the third cell sheet (23), the end bus bar (4) is electrically isolated from the plurality of third cell sheets (23) by the end insulating bar (41), and a plurality of second solder segments (32) on the plurality of back contact cell strings are all connected to the end bus bar (4).

Description

Back contact battery string production process, photovoltaic module production process, back contact battery string and photovoltaic module Technical Field The invention relates to the technical field of photovoltaic modules, in particular to a back contact battery string production process, a photovoltaic module production process, a back contact battery string and a photovoltaic module. Background The photovoltaic module is a power generation device for converting light energy into electric energy by utilizing a semiconductor material, realizes stable power generation by a solid structure without movable parts based on photovoltaic effect, and is suitable for power supply of small electronic equipment, building surface integration, grid-connected power systems and the like. The photovoltaic module generally includes a plurality of cell strings connected by bus bars, which realize series connection or parallel connection of the cell strings. In the production process of the battery string, a plurality of battery pieces are connected through welding strips to form a short string, then at least two short strings are spliced by manpower or a machine, wherein an interval gap is generally reserved between adjacent short strings and used for placing bus bars, and then the bus bars are welded with the welding strips on the short strings to form a complete battery string. However, the above battery string production process is complicated in process, and in addition, the bus bars are welded with the solder strips on the short strings at the interval gaps, so that the virtual welding is easy to occur between the bus bars and the solder strips on the short strings, and the interval gaps are also easy to cause cracking, packaging delamination and the like of the photovoltaic module due to the problem of local stress. Therefore, the application provides a novel back contact battery string production process, a photovoltaic module production process, a back contact battery string and a photovoltaic module aiming at the problems. Disclosure of Invention The first objective of the present invention is to provide a production process of a back contact battery string, so as to at least alleviate the technical problems of complex production process, easy cold joint, and easy cracking of a photovoltaic module caused by stress problem in the battery string in the prior art. The second objective of the present invention is to provide a production process of a photovoltaic module, so as to further alleviate the technical problems of complex production process, easy cold joint, and easy cracking of the photovoltaic module caused by stress problem in the battery string in the technology. The third objective of the present invention is to provide a back contact battery string, so as to further alleviate the technical problems of complex production process, easy cold joint, and easy cracking of the photovoltaic module caused by stress problem in the battery string in the technology. The fourth objective of the present invention is to provide a photovoltaic module, so as to further alleviate the technical problems of complex production process, easy cold joint, and easy cracking of the photovoltaic module due to stress problem in the battery string in the technology. Based on the first object, the present invention provides a back contact battery string production process, comprising: A sheet arranging step of arranging a plurality of battery sheets for forming the battery string in sequence along a first direction; A stringing step, namely connecting adjacent battery pieces through welding strips; The welding strip at least comprises a splicing welding strip, the splicing welding strip is projected to the inside of the battery string, and the splicing welding strip is provided with a tilting section which is opposite to the tilting section of the battery piece, so that a first accommodating space for accommodating the middle bus bar is formed between the tilting section and the battery piece. Further, a tilting angle between the tilting section and the battery piece is smaller than 90 degrees, and/or the length of the tilting section is not smaller than 5mm. Further, the battery pieces comprise a first battery piece positioned at two ends of the battery string and two second battery pieces positioned between the two first battery pieces, and the two second battery pieces are adjacently arranged; The splicing welding strip further comprises a first connecting section and a second connecting section which are connected, and the tilting section is connected to one side, far away from the first connecting section, of the second connecting section; the first connecting section and the second connecting section are respectively connected with the two second battery pieces. Further, the battery piece further comprises a plurality of third battery pieces located between the first battery piece and the second battery piece, and the tilting