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CN-122028518-A - Battery string assembly and manufacturing method thereof

CN122028518ACN 122028518 ACN122028518 ACN 122028518ACN-122028518-A

Abstract

The invention discloses a battery string assembly and a manufacturing method thereof, and relates to the technical field of photovoltaic assemblies. The battery string assembly comprises a battery string, a bus bar, a first insulating buffer layer and a second insulating buffer layer, wherein the welding strip comprises a connecting welding strip electrically connected to the back of a battery piece and a turnover welding strip turned towards the back of the battery piece, the turnover welding strips are arranged along the length direction of the bus bar, the first insulating buffer layer covers the back of the battery piece and the connecting welding strip, the second insulating buffer layer covers the surface, facing away from the battery piece, of the first insulating buffer layer, a part of the turnover welding strip is embedded in the second insulating buffer layer, and the part, exposed out of the second insulating buffer layer, of the turnover welding strip is electrically connected with the bus bar. The battery string assembly may position and secure the flip weld, or the flip weld to the bus bar prior to lamination.

Inventors

  • LV PENGCHENG
  • CHEN HONGYUE
  • DING JIAWEI

Assignees

  • 晶澳（扬州）太阳能科技有限公司

Dates

Publication Date
20260512
Application Date
20260211

Claims (10)

  1. 1. A battery string assembly characterized by comprising a battery string (10), a bus bar (30), a first insulating buffer layer (40) and a second insulating buffer layer (50); the battery string (10) comprises a plurality of battery pieces (11), and the adjacent battery pieces (11) are electrically connected through welding strips (20); The welding strip (20) comprises a connecting welding strip (21) electrically connected to the back of the battery piece (11) and a turnover welding strip (22) turned towards the back of the battery piece (11), and a plurality of turnover welding strips (22) are arranged along the length direction of the bus bar (30); The first insulating buffer layer (40) covers the back surface of the battery piece (11) and the connecting welding strip (21); the second insulating buffer layer (50) covers the surface of the first insulating buffer layer (40) facing away from the battery piece (11); A part of the turnover welding strip (22) is embedded in the second insulation buffer layer (50), and the part of the turnover welding strip (22) exposed out of the second insulation buffer layer (50) is electrically connected with the bus bar (30).
  2. 2. The battery string assembly according to claim 1, wherein the second insulating buffer layer (50) comprises a first smooth portion (51) and a first recessed portion (52), the first smooth portion (51) having a first surface (511) facing away from the battery piece (11) and a second surface (512) facing towards the battery piece (11), the first recessed portion (52) being recessed in a direction towards the battery piece (11) compared to the first surface (511); Wherein a part of the turnover welding strip (22) is embedded in the first concave part (52), and a part of the turnover welding strip (22) exposed out of the first surface (511) is electrically connected with the bus bar (30).
  3. 3. The battery string assembly according to claim 2, wherein the thickness of the first insulating buffer layer (40) is greater than or equal to the diameter of the connection strap (21), the first insulating buffer layer (40) comprising a second smooth portion (41), the second smooth portion (41) comprising a third surface (411) facing away from the battery piece (11) and a fourth surface (412) facing towards the battery piece (11).
  4. 4. The battery string assembly according to claim 2, wherein the first insulating buffer layer (40) has a thickness smaller than the diameter of the connection pads (21), the first insulating buffer layer (40) comprising a second smooth portion (41) and a first arched portion (42), the second smooth portion (41) comprising a third surface (411) facing away from the battery piece (11) and a fourth surface (412) facing towards the battery piece (11), the first arched portion (42) being arched in a direction facing away from the battery piece (11) compared to the third surface (411); Wherein the first arch (42) encloses the connection strap (21).
  5. 5. The battery string assembly of claim 4, wherein the second insulating buffer layer (50) further comprises a second raised portion (53), the second raised portion (53) being flush with the first surface (511) and raised in a direction away from the battery sheet (11) as compared to the second surface (512); wherein the second arch (53) encloses the first arch (42).
  6. 6. The battery string assembly of claim 4, wherein the second insulating buffer layer (50) further comprises a second arched portion (53), the second arched portion (53) being arched in a direction away from the battery sheet (11) compared to the first surface (511) and the second surface (512); wherein the second arch (53) encloses the first arch (42).
  7. 7. The battery string assembly of any of claims 1-6 further comprising a conductive layer (60) extending along a length of the bus bar (30), the conductive layer (60) being electrically connected in synchronization with a plurality of the flip weld straps (22) aligned along the length of the bus bar (30) and with the bus bar (30).
  8. 8. The battery string assembly of claim 7, wherein the conductive layer (60) is disposed between the flip weld strap (22) and the second insulating buffer layer (50); Or alternatively The conductive layer (60) is disposed between the flip strap (22) and the bus bar (30).
  9. 9. A method of manufacturing a battery string assembly, comprising: step A1, electrically connecting a connecting welding strip (21) to the back surface of a battery piece (11); Step A2, covering a first insulating buffer layer (40) on the back surface of the battery piece (11) and the connecting welding strip (21), and curing the first insulating buffer layer (40); step A3, electrically connecting a turnover welding strip (22) with a bus bar (30), wherein the bus bar (30) is positioned on one side of the turnover welding strip (22) facing the front surface of the battery piece (11); step A4, covering a second insulating buffer layer (50) on the surface of the first insulating buffer layer (40) facing away from the battery piece (11); Step A5, the turnover welding strip (22) is turned over to the back surface of the battery piece (11), and a part of the turnover welding strip (22) in the thickness direction, which is not electrically connected with the bus bar (30), is embedded into the second insulation buffer layer (50), so that the part of the turnover welding strip (22) in the thickness direction, which is electrically connected with the bus bar (30), is exposed out of the second insulation buffer layer (50); and step A6, curing the second insulating buffer layer (50).
  10. 10. A method of manufacturing a battery string assembly, comprising: step B1, electrically connecting the connecting welding strip (21) to the back surface of the battery piece (11); Step B2, covering the back surface of the battery piece (11) and the connecting welding strip (21) with a first insulating buffer layer (40), and curing the first insulating buffer layer (40); step B3, covering a second insulating buffer layer (50) on the surface of the first insulating buffer layer (40) facing away from the battery piece (11); Step B4, folding a folding welding strip (22) to the back surface of the battery piece (11), embedding a part of the folding welding strip (22) in the thickness direction into the second insulating buffer layer (50), and then solidifying the second insulating buffer layer (50); And step B5, electrically connecting the part of the turnover welding strip (22) exposed out of the second insulating buffer layer (50) in the thickness direction with the bus bar (30).

Description

Battery string assembly and manufacturing method thereof Technical Field The invention relates to the technical field of photovoltaic modules, in particular to a battery string module and a manufacturing method thereof. Background The rapid development of photovoltaic modules has driven the photovoltaic industry to bring forward the urgent hope of higher power for the modules. The traditional photovoltaic module is placed the busbar in the outside of battery piece, has taken the certain useless space of subassembly, at present usually hides the busbar to the back of battery piece to the battery piece total area of further increase subassembly, thereby improve the power of subassembly. The hidden bus bar needs to be folded to the back of the battery piece and is connected with the bus bar positioned on the back of the battery piece, in the prior art at present, the folded welding strip and the bus bar are not fixed, the welding strip is easy to tilt and shift in the subsequent preparation process, in the lamination process, an adhesive film possibly flows to enter the lower part of the tilted welding strip and/or the bus bar, so that the back of the battery piece is locally protruding, and under the action of the lamination pressure, the battery piece is easily hidden to crack or disintegrate due to the stress concentration of the local protruding position. Disclosure of Invention In view of the above, the present invention provides a battery string assembly and a manufacturing method thereof, so as to solve the technical problems of solder strip warpage, displacement, and battery piece hidden cracking or breaking. In order to solve the above technical problems, according to one aspect of the present invention, there is provided a battery string assembly including a battery string, a bus bar, a first insulating buffer layer, and a second insulating buffer layer; the battery string comprises a plurality of battery pieces, and adjacent battery pieces are electrically connected through a welding strip; The welding strips comprise connecting welding strips electrically connected to the back of the battery piece and turnover welding strips turned towards the back of the battery piece, and the plurality of turnover welding strips are arranged along the length direction of the bus bar; The first insulating buffer layer covers the back surface of the battery piece and the connecting welding strip; the second insulating buffer layer covers the surface of the first insulating buffer layer, which is away from the battery piece; A portion of the flip strap is embedded in the second insulating buffer layer, and a portion of the flip strap exposed to the second insulating buffer layer is electrically connected to the bus bar. Optionally, the second insulating buffer layer includes a first smooth portion and a first concave portion, the first smooth portion has a first surface facing away from the battery piece and a second surface facing toward the battery piece, and the first concave portion is concave in a direction toward the battery piece compared to the first surface; and a part of the turnover welding strip is embedded in the first concave part, and the part of the turnover welding strip exposed out of the first surface is electrically connected with the bus bar. Optionally, the thickness of the first insulating buffer layer is greater than or equal to the diameter of the connection solder strip, the first insulating buffer layer includes a second smooth portion, and the second smooth portion includes a third surface facing away from the battery piece and a fourth surface facing toward the battery piece. Optionally, the thickness of the first insulating buffer layer is smaller than the diameter of the connection welding strip, the first insulating buffer layer comprises a second smooth part and a first arched part, the second smooth part comprises a third surface facing away from the battery piece) and a fourth surface facing the battery piece, and the first arched part is arched in a direction facing away from the battery piece compared with the third surface; wherein, the first arch part wraps the connecting welding strip. Optionally, the second insulating buffer layer further includes a second arched portion that is flush with the first surface and arched in a direction away from the battery piece compared to the second surface; wherein the second arch part wraps the first arch part. Optionally, the second insulating buffer layer further includes a second arched portion that is arched in a direction away from the battery piece compared to the first surface and the second surface; wherein the second arch part wraps the first arch part. Optionally, the battery string assembly further includes a conductive layer extending along a length direction of the bus bar, the conductive layer being electrically connected to the bus bar in synchronization with a plurality of flip-type solder strips arranged along the length di