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CN-121980706-A - Multi-slice photovoltaic module design method and photovoltaic module

CN121980706ACN 121980706 ACN121980706 ACN 121980706ACN-121980706-A

Abstract

The application discloses a design method of a multi-slice photovoltaic module and the photovoltaic module, the photovoltaic module comprises a laminated piece, a frame and water-blocking sealant positioned at the outer side of a packaging layer, a battery string group formed by connecting a plurality of small piece battery pieces in series is arranged in the laminated piece. According to the design method, an optimization model is constructed, the maximum layout number of the battery strings is taken as a target, the variables are the width of the water-blocking sealant and the spacing between the battery pieces, and the constraint conditions cover the parameters such as the size of the cover plate, the position of the bus bar, the creepage distance and the like. According to the method, on the premise that IEC safety standards are met, the optimal width of the butyl rubber strip and the maximum arrangement quantity of the battery pieces are calculated, and more three-piece or four-piece battery pieces are placed in a determined model, so that the power density of the assembly is improved. Meanwhile, the production process difficulty is reduced and the production yield is improved by optimizing the spacing of the battery pieces.

Inventors

  • WANG JIANMING
  • YAO JIE
  • HU HENG
  • ZU GUOLIANG

Assignees

  • 苏州晟成光伏设备有限公司

Dates

Publication Date
20260505
Application Date
20260128

Claims (10)

  1. 1. The design method of the multi-slice photovoltaic module is characterized by comprising the steps of solving the total number of the layout of the small slice battery slices on the cover plate along the first direction according to an optimization model The optimization model comprises inequality, variables, associated parameters, solving targets and constraint conditions, wherein the inequality is as follows: ; the variables include the spacing L 5 between two adjacent battery pieces in a single battery string, the width W 1 of the water-blocking sealant and the number of the battery pieces in the single battery string ; The related parameters include a cover plate dimension L 1 , a distance L 2 of the outermost side of the end bus bar from the adjacent cell string edge, a cell sheet length L 3 , an intermediate bus bar width W 2 , a distance L 4 of the intermediate bus bar from the adjacent cell string edge, and an intermediate bus bar number N 1 ; the solving targets are as follows: ; The constraint conditions include: Constraint 1: Is an integer and ; Constraint 2N 1 is equal to 0 or 1; Constraint 3: mm。
  2. 2. the method for designing a multi-segment photovoltaic module according to claim 1, characterized in that, in said constraint 1, The range of the values is as follows: In the constraint 3, the range of values of the battery piece length L 3 is: mm。
  3. 3. The method for designing a multi-segment photovoltaic module according to claim 1, wherein the range of values of the distance L 5 is: mm。
  4. 4. the method for designing the multi-piece photovoltaic module according to claim 1, wherein the water-blocking sealant is a butyl adhesive tape, and the width W 1 of the butyl adhesive tape is 3.5-4 mm.
  5. 5. The method of claim 4, wherein the constraint condition further comprises constraint 4-1 or constraint 4-2, and the associated parameter further comprises a minimum creepage distance L 6 ; The constraint 4-1 is that when a water blocking layer is arranged between interfaces of frame cladding layer pressing pieces in the multi-piece photovoltaic module, the width W 1 of the water blocking sealant meets the following conditions: ; Wherein H 1 is the thickness of the packaging layer, H 2 is the thickness of the first cover plate, W 3 is the width of the water-resistant layer covering the first cover plate, and H 3 is the thickness of the water-resistant layer; The constraint 4-2 is that when the water blocking layer is not arranged, the width W 1 of the water blocking sealant meets the following conditions: 。
  6. 6. The method of claim 5, wherein prior to solving the optimization model, solving for a minimum width of a butyl strip based on the constraint 4-1 or the constraint 4-2 Minimum width of butyl rubber As a known parameter, the parameters are substituted into the optimization model, and the optimization model satisfies the following conditions Solving to obtain the total number of the layout of the maximized small-piece battery pieces on the premise of mm 。
  7. 7. A design method of a multi-slice photovoltaic module is characterized in that the total number of the layout of the maximized small slice battery slices obtained by solving according to the design method of the multi-slice photovoltaic module as set forth in claim 1 And reversely calculating the distance L 5 between the battery pieces, wherein the distance L 5 meets the following conditions: 。
  8. 8. The photovoltaic module is characterized by being designed by adopting the multi-piece photovoltaic module design method according to any one of claims 1 to 7, and comprises a laminated piece and a frame clamped and fixed on the edge of the laminated piece, wherein the laminated piece comprises a first cover plate, a packaging layer, a second cover plate, a battery layer packaged in the packaging layer and water-blocking sealant positioned outside the packaging layer, and the first cover plate, the packaging layer and the second cover plate are sequentially stacked from top to bottom.
  9. 9. The photovoltaic module according to claim 8, wherein the cell layer includes a plurality of cells, two adjacent cells are connected by a solder strip, the solder strip connects the plurality of cells in series along the first direction to form a cell string, the plurality of cell strings are arranged along a second direction to form a cell string group, the cell string group is electrically connected at two ends of the first direction by end bus bars, the second direction is perpendicular to the first direction, and the cells are three or four segments.
  10. 10. The photovoltaic module according to claim 9, wherein the water-blocking sealant is a butyl adhesive tape and is located between the first cover plate and the second cover plate, the butyl adhesive tape is closely attached to the outer side of the end bus bar, the battery layer further comprises an intermediate bus bar arranged in the middle of the battery string group, one battery string is divided into two battery sub-strings, one ends of the two battery sub-strings are electrically connected through the intermediate bus bar, and a water-blocking layer is arranged between the boundary surfaces of the frame and the laminated piece.

Description

Multi-slice photovoltaic module design method and photovoltaic module Technical Field The application belongs to the technical field of photovoltaic module design, and particularly relates to a multi-slice photovoltaic module design method and a photovoltaic module. Background In the photovoltaic industry, by cutting the cells into smaller pieces (e.g., 1/2 pieces as is common), the current transfer losses can be reduced, thereby reducing packaging losses and increasing component power. However, when smaller fragments (such as 1/3 or 1/4 fragments) are tried, because of limitation of the size of the component glass (for example, the glass size of the standard 2382 format is 2376 mm), the total length of the cell string that can be laid out on the glass plate surface is also limited, and the smaller 1/3 or 1/4 fragments compared with the whole fragments or 1/2 fragments, the total number of the cell sheets in the single cell string increases by multiple, resulting in an increase of the number of gaps in the whole cell string, and the number of gaps is smaller than the number of the cell sheets by 1, so that the length ratio of the total gaps of the cell sheets in the whole cell string may be higher, in order to solve the technical problem, in the prior art, the problem that the cell sheets cannot be laid out in a limited length range due to the excessively large gaps of the cell sheets is generally solved, for example, the photovoltaic module disclosed in the patent CN120980966a and the preparation method thereof, but the negative spacing brings some drawbacks: (1) The overlapping part of the battery pieces does not generate electricity, so that waste is caused; (2) The overlapping part has reliability risks such as hidden cracks, fragments and the like; (3) Additional cushioning structures, such as stopper films, are required, requiring additional costs; (4) Even with the cushioning structure, the risk of chipping is still high. Therefore, it is necessary to design a multi-segment photovoltaic module design method, which avoids negative spacing and can layout more battery segments to ensure the set minimum power. Disclosure of Invention The application mainly aims to provide a multi-slice photovoltaic module design method and a photovoltaic module, which solve the technical problems of how to simultaneously meet electrical safety, power density and production yield in the design of a high-density small-slice photovoltaic module by constructing an optimal design model taking the maximum layout number of battery slices as a target and taking the width of butyl rubber and the distance between the battery slices as variables, and achieve the technical effects of maximizing the number of battery slices in a determined model, improving the module power and optimizing a production process window to improve the feasibility of mass production. The multi-slice photovoltaic module design method comprises the following steps of solving the total number of the small-slice cell layout on the cover plate along the first direction according to an optimization modelThe optimization model comprises inequality, variables, associated parameters, solving targets and constraint conditions, wherein the inequality is as follows: ; The variables include the spacing L 5 between two adjacent battery pieces in a single battery string, the water-blocking sealant width W 1 of the water-blocking sealant and the number of the battery pieces in the single battery string ; The related parameters include a cover plate dimension L 1, a distance L 2 of the outermost side of the end bus bar from the adjacent cell string edge, a cell sheet length L 3, an intermediate bus bar width W 2, a distance L 4 of the intermediate bus bar from the adjacent cell string edge, and an intermediate bus bar number N 1; the solving targets are as follows: ; The constraint conditions include: Constraint 1: Is an integer and ; Constraint 2N 1 is equal to 0 or 1; Constraint 3: mm。 further, in the constraint 1, The range of the values is as follows: In the constraint 3, the range of values of the battery piece length L 3 is: mm。 Further, the range of the distance L 5 is: mm。 further, the water-blocking sealant is a butyl adhesive tape, and the width W 1 of the butyl adhesive tape is 3.5-4 mm. Further, the constraint condition also comprises constraint 4-1 or constraint 4-2, and the associated parameter also comprises a minimum creepage distance L 6; The constraint 4-1 is that when a water blocking layer is arranged between interfaces of frame cladding layer pressing pieces in the multi-piece photovoltaic module, the width W 1 of the water blocking sealant meets the following conditions: ; Wherein H 1 is the thickness of the packaging layer, H 2 is the thickness of the first cover plate, W 3 is the width of the water-resistant layer covering the first cover plate, and H 3 is the thickness of the water-resistant layer; the constraint 4-2 is that when no water blocking