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CN-121985621-A - Battery string preparation method and photovoltaic module

CN121985621ACN 121985621 ACN121985621 ACN 121985621ACN-121985621-A

Abstract

The invention relates to the technical field of photovoltaics, in particular to a battery string preparation method and a photovoltaic module. The preparation method of the battery string mainly comprises the following steps of typesetting the battery string. And laying interconnection welding strips on two adjacent battery pieces. The end welding strip is bent to form a first connecting part and a second connecting part which are connected with each other, the first connecting part is electrically connected with the first battery piece, the second connecting part is arranged at a preset included angle R with the first battery piece, and the connecting point of the first connecting part and the second connecting part is positioned at the first battery piece or at a first interval. And attaching the bus bar to the second connecting part and then welding and fixing the bus bar and the second connecting part. The isolation belt is attached to the second connecting part or the bus bar, and the bus bar is positioned on one side of the isolation belt. And carrying out hot pressing fixation on the isolation belt, the second connecting part and the bus bar to form a turnover body, and pushing the turnover body to turn clockwise. The preparation method of the battery string can reduce the risk of hidden cracking of the battery piece, improve the product yield of the battery string and save the cost.

Inventors

  • WU GUOXING
  • JIN YEYI
  • HE CHENXU
  • QIAN HUAN

Assignees

  • 正泰新能科技股份有限公司

Dates

Publication Date
20260505
Application Date
20260203

Claims (12)

  1. 1. The preparation method of the battery string is characterized by comprising the following steps: Arranging a plurality of battery pieces along a first direction to form a battery string (10), wherein the battery string (10) comprises a first battery piece (11) positioned at the head end and the tail end, a second battery piece (12) adjacent to the first battery piece (11) and a third battery piece (13) adjacent to the second battery piece (12), a first interval (14) is formed between the first battery piece (11) and the second battery piece (12), and a second interval (15) is formed between the second battery piece (12) and the third battery piece (13) and between the two adjacent third battery pieces (13); Laying interconnection welding strips (42) on two adjacent battery pieces; Bending the end welding strip (41) to form a first connecting part (411) and a second connecting part (412) which are connected with each other, electrically connecting the first connecting part (411) with the first battery piece (11), and setting the second connecting part (412) and the first battery piece (11) to form a preset included angle R, wherein the connecting point of the first connecting part (411) and the second connecting part (412) is positioned at the first battery piece (11) or positioned at the first interval (14); bonding the bus bar (30) and the second connecting part (412) and then welding and fixing; Attaching the separator (20) to the second connection portion (412) or the bus bar (30), the bus bar (30) being located on one side of the separator (20); and carrying out hot pressing fixation on the isolation belt (20), the second connecting part (412) and the bus bar (30) to form a turnover body, and pushing the turnover body to turn clockwise or anticlockwise so as to enable the turnover body to be parallel to the first battery piece and/or the second battery piece.
  2. 2. The method of manufacturing a battery string according to claim 1, wherein the step of bonding the bus bar (30) to the second connecting portion (412) and then welding and fixing includes: The second connecting part (412) is provided with a connecting surface A (413) and a connecting surface B (414) which are oppositely arranged, the connecting surface A (413) is arranged towards the first battery piece (11), and the connecting surface B (414) is arranged towards the second battery piece (12); the bus bar (30) is bonded to the connection surface A (413) or the connection surface B (414) and welded and fixed.
  3. 3. The method of manufacturing a battery string according to claim 2, wherein the step of attaching the separator (20) to the second connection portion (412) or the bus bar (30) with the bus bar (30) located at one side of the separator (20) includes: when the bus bar (30) is attached to the connection surface A (413) and welded and fixed, the separator (20) is attached to the connection surface B (414) of the second connection part (412); when the bus bar (30) is bonded to the connection surface B (414) and welded and fixed, the separator (20) is bonded to the bus bar (30).
  4. 4. The method of manufacturing a battery string according to claim 1, wherein the preset included angle R is set to 90 ° ± 60 °.
  5. 5. The method of manufacturing a battery string according to claim 1, wherein the separator (20) includes a connection surface C (21) and a connection surface D (22) that are disposed opposite to each other, the connection surface C (21) being attached to the second connection portion (412) or the bus bar (30), the connection surface D (22) being disposed toward a direction approaching the second battery piece (12); pushing the overturning body to overturn in a clockwise direction so that the overturning body is parallel to the first battery piece (11) and/or the second battery piece (12).
  6. 6. The method of manufacturing a battery string (10) according to claim 1, wherein the separator (20) includes a connection surface C (21) and a connection surface D (22) that are disposed opposite to each other, the connection surface D (22) being attached to a second connection portion (412) or a bus bar (30), the connection surface C (21) being disposed toward a direction approaching the first battery piece (11); Pushing the turnover body to turn in a counterclockwise direction so that the turnover body is parallel to the first battery piece (11) and/or the second battery piece (12).
  7. 7. The method of manufacturing a battery string according to claim 1, wherein the step of attaching the separator (20) to the second connection portion (412) or the bus bar (30) with the bus bar (30) located at one side of the separator (20) includes: the separator 20 is cut so that the width of the separator 20 is larger than the width of the first pitch 14 and the width of the separator 20 is not smaller than the width of the bus bar 30.
  8. 8. The battery string production method according to claim 1, wherein the step of heat press-fixing the separator (20), the second connection portion (412), and the bus bar (30) to form the turnover body comprises: the hot pressing head is adopted to carry out bidirectional hot pressing along the direction vertical to the opposite two sides of the turnover body, and the projection area of the hot pressing surface of the hot pressing head along the direction vertical to the turnover body is not smaller than the projection area of the turnover body.
  9. 9. The battery string preparation method according to claim 1, further comprising the steps of: A first carrier film (50) is laid on each of the second cell (12) and the third cell (13) so that the first carrier film (50) pre-fixes the interconnection solder strip (42) on the second cell (12) and the third cell (13).
  10. 10. The method of manufacturing a battery string according to claim 1, wherein after the step of pushing the overturning body to overturn in the clockwise direction or the counterclockwise direction, further comprising the steps of: A second carrier film (60) is applied to the first cell (11) such that the second carrier film (60) pre-secures the end strap (41) to the first cell (11).
  11. 11. The battery string preparation method according to claim 1, further comprising a multi-string interconnection step of: arranging a plurality of battery strings (10) in parallel along a second direction perpendicular to the first direction; The bus bars (30) are extended in a second direction and span a first spacing (14) of at least two cell strings (10) such that adjacent cell strings (10) are connected in parallel or in series.
  12. 12. A photovoltaic module, characterized in that it is made by the cell string preparation method according to any one of claims 1 to 11, comprising: The battery string (10) comprises a first battery piece (11), a second battery piece (12) and a third battery piece (13) which are sequentially arranged along a first direction, wherein a first interval (14) is arranged between the first battery piece (11) and the second battery piece (12), and a second interval (15) is arranged between the second battery piece (12) and the third battery piece (13) and between two adjacent third battery pieces (13); A separator (20) provided at the first pitch (14) and covering the back surface of the first cell (11) and/or the second cell (12); a bus bar (30), the bus bar (30) being disposed above the separator (20); The welding strip (40) comprises an end welding strip (41) and an interconnection welding strip (42), the end welding strip (41) is electrically connected with the first battery piece (11) and the bus bar (30), the interconnection welding strip (42) is electrically connected with the first battery piece (11) and the second battery piece (12), the second battery piece (12) and the third battery piece (13) and two adjacent third battery pieces (13), the end welding strip (41) is located above the isolation strip (20), and the interconnection welding strip (42) is located below the isolation strip (20).

Description

Battery string preparation method and photovoltaic module Technical Field The invention relates to the technical field of photovoltaics, in particular to a battery string preparation method and a photovoltaic module. Background The bus bars are used as key connecting parts of the photovoltaic module, and the installation mode of the bus bars has important influence on the light absorption efficiency and the structural stability of the photovoltaic module. Hiding the bus bar on the back of the battery piece can reduce shielding of the bus bar on light, so that effective luminous flux of the photovoltaic module is improved, and the bus bar is an important technical trend of current photovoltaic module design and manufacture. In the related art, the bus bar and the welding strip are connected in a welding mode that the bus bar is directly arranged on the back face of the battery to be welded with the end welding strip in situ, and large extrusion force is required to be applied when the bus bar and the end welding strip are welded, so that the risk of hidden cracking or even fragments of the battery piece is increased, the product yield of the battery string is reduced, and the manufacturing cost is increased. Therefore, there is a need to design a battery string manufacturing method and a photovoltaic module to solve the above technical problems. Disclosure of Invention The invention aims to provide a battery string preparation method and a photovoltaic module, which can reduce the risks of hidden cracking and splitting of battery pieces, improve the product yield of the battery string and save the cost. To achieve the purpose, the invention adopts the following technical scheme: in one aspect, the present invention provides a method for preparing a battery string, comprising the steps of: Arranging a plurality of battery pieces along a first direction to form a battery string, wherein the battery string comprises a first battery piece positioned at the head end and the tail end, a second battery piece adjacent to the first battery piece and a third battery piece adjacent to the second battery piece; Laying interconnection welding strips on two adjacent battery pieces; Bending the end welding strip to form a first connecting part and a second connecting part which are connected with each other, and electrically connecting the first connecting part with the first battery piece, wherein the second connecting part and the first battery piece are arranged at a preset included angle R; attaching the bus bar to the second connecting part and then welding and fixing the bus bar and the second connecting part; Attaching the isolation belt to the second connecting part or the bus bar, wherein the bus bar is positioned at one side of the isolation belt; and carrying out hot pressing fixation on the isolation belt, the second connecting part and the bus bar to form a turnover body, and pushing the turnover body to turn clockwise or anticlockwise so as to enable the turnover body to be parallel to the first battery piece and/or the second battery piece. As an alternative solution of the battery string manufacturing method, the step of bonding the bus bar to the second connection portion and then welding and fixing includes: The second connecting part is provided with a connecting surface A and a connecting surface B which are oppositely arranged, the connecting surface A is arranged towards the first battery piece, and the connecting surface B is arranged towards the second battery piece; And attaching the bus bar to the connecting surface A or the connecting surface B and welding and fixing the bus bar. As an alternative solution of the battery string manufacturing method, the step of attaching the separator to the second connection portion or the bus bar, and the bus bar is located at one side of the separator includes: When the bus bar is attached to the connecting surface A and welded and fixed, the isolation belt is attached to the connecting surface B of the second connecting part; when the bus bar is attached to the connecting surface B and welded and fixed, the isolation belt is attached to the bus bar. As an alternative technical scheme of the battery string preparation method, the preset included angle R is set to 90 ° ± 60 °. As an alternative technical scheme of the battery string preparation method, the isolation belt comprises a connecting surface C and a connecting surface D which are oppositely arranged, wherein the connecting surface C is attached to a second connecting part or a bus bar, and the connecting surface D is arranged in a direction approaching to the second battery piece; Pushing the overturning body to overturn in a clockwise direction so that the overturning body is parallel to the first battery piece and/or the second battery piece. As an alternative technical scheme of the battery string preparation method, the isolation belt comprises a connecting surface C and a connecting surface D whi