CN-121985597-A - Grid skin membrane, membrane preparation equipment

Abstract

The invention discloses a grid skin film and film making equipment, which are applied to the technical field of photovoltaics and are used for realizing the electric connection of a welding strip and a battery piece, and comprise a plurality of longitudinal adhesive films, wherein the longitudinal adhesive films are distributed at intervals along the length direction of the welding strip, and a hollow area is formed between the adjacent longitudinal adhesive films; and when the battery piece is attached, the middle area of the longitudinal adhesive film presses the welding strip, and both side edge areas of the longitudinal adhesive film and the transverse adhesive film are adsorbed and fixed with the surface of the battery piece. Meets the requirements of the non-main grid line film coating technology on the low-cost and high-reliability skin film.

Inventors

• CAO JINGLE
• PANG SHAOHUA
• ZHANG XIUJUAN

Assignees

• 正泰新能科技股份有限公司

Dates

Publication Date

20260505

Application Date

20260204

Claims (10)

1. 1. A mesh skin film for realizing electrical connection of a solder strip (2) and a battery piece (1), characterized by comprising: The longitudinal adhesive films (3) are arranged at intervals along the length direction of the welding strip (2), and hollow areas (5) are formed between adjacent longitudinal adhesive films (3); A transverse adhesive film (4) connected to the end of each longitudinal adhesive film (3); when the battery piece is adhered, the welding strips (2) are pressed on the middle area of the longitudinal adhesive film (3), and the two side edge areas of the longitudinal adhesive film (3) and the transverse adhesive film (4) are adsorbed and fixed with the surface of the battery piece (1).
2. 2. The grid skin membrane according to claim 1, wherein a plurality of the longitudinal adhesive films (3) and the transverse adhesive films (4) are enclosed to form a skin membrane unit, the outline of the skin membrane unit is matched with the outline of a single cell sheet (1), and the grid skin membrane comprises at least two skin membrane units which are arranged continuously and are used for covering at least two cell sheets (1) in the same cell string.
3. 3. The gridding skin membrane according to claim 1, characterized in that the width of the longitudinal glue film (3) is equal to the width of the hollowed-out area (5), and the central line of each longitudinal glue film (3) coincides with the central line of the corresponding welding strip (2).
4. 4. A film-forming apparatus for manufacturing the mesh skin film as claimed in any one of claims 1 to3, comprising: a frame (6); The longitudinal film discharging mechanism (7) is arranged on the frame (6), the longitudinal film discharging mechanism (7) comprises a storage chamber (71), the storage chamber (71) is provided with a discharge hole (75), and glue material continuously flows out from the discharge hole (75) to form the longitudinal glue film (3); The transverse compounding mechanism (8) comprises a press roll cavity (81), wherein the press roll cavity (81) is provided with a glue outlet (86), the press roll cavity (81) rotates alternately at a first angular speed and a second angular speed, when the glue outlet (86) is in contact with the longitudinal glue film (3), the press roll cavity rotates at the first angular speed, glue flows out through the glue outlet (86) and forms the transverse glue film (4), when the glue outlet (86) is separated from the longitudinal glue film (3), the press roll cavity rotates at the second angular speed, and the next glue outlet (86) is waited to be in contact with the longitudinal glue film (3) again; The laminating mechanism (9), the laminating mechanism (9) comprises a first press roller and a second press roller which rotate in opposite directions, and a pressing seam is formed between the first press roller and the second press roller and is used for laminating and shaping the adhesive film after the transverse compounding is completed.
5. 5. Film forming equipment according to claim 4, characterized in that the side wall of the press roll cavity (81) is alternately provided with a plurality of convex cambered surfaces (88) and concave cambered surfaces (87) along the circumferential direction, the glue outlet (86) is arranged on the convex cambered surfaces (88), when the convex cambered surfaces (88) rotate to be vertical to the longitudinal glue film (3) in the radial direction, the surfaces of the convex cambered surfaces (88) are in contact with the longitudinal glue film (3) and extrude the transverse glue film (4), and when the concave cambered surfaces (87) rotate to be vertical to the longitudinal glue film (3) in the radial direction, the surfaces of the concave cambered surfaces (87) keep a gap with the longitudinal glue film (3).
6. 6. Film forming apparatus according to claim 5, characterized in that the arc length of each convex arc surface (88) is equal and the arc length of each concave arc surface (87) is equal.
7. 7. Film forming equipment according to claim 5, characterized in that the transverse compounding mechanism (8) is provided with a pair of press roller cavities (81), the two press roller cavities (81) rotate in opposite directions and synchronously, a gap is reserved between convex cambered surfaces (88) of the two press roller cavities (81), and the width of the gap is equal to the thickness of the longitudinal adhesive film (3).
8. 8. Film forming equipment according to claim 5, wherein the press roll cavity (81) comprises a glue injection cavity and a glue discharge cavity, the glue injection cavity is surrounded by the concave cambered surface (87) and forms a notch in the circumferential direction, two side edges of the notch are connected with the root of the glue discharge cavity, the tail end of the glue discharge cavity is surrounded by the convex cambered surface (88), and the cross section of the glue discharge cavity gradually expands from the root to the tail end.
9. 9. Film forming apparatus according to claim 4, characterized in that the storage chamber (71) is provided with a feed opening (72) and a feed opening (73), and that the glue material enters the storage chamber (71) from the feed opening (72) and continuously flows out through the feed opening (73); The glue nozzle (74) is detachably connected to the material through hole (73), the glue nozzles (74) are arranged on the material through holes (75), and glue materials are synchronously extruded from the material through holes (75) after entering the material through holes (73) to form a plurality of longitudinal glue films (3).
10. 10. Film forming apparatus according to claim 9, wherein the outlet (75) forms a through film outlet channel (76) perpendicular to the surface of the nozzle (74), the film outlet channel (76) being gradually narrowed from the feed side to the discharge side, and the cross section of the film outlet channel (76) on the discharge side being rectangular.

Description

Grid skin membrane, membrane preparation equipment Technical Field The invention relates to the technical field of photovoltaics, in particular to a grid skin membrane and membrane making equipment. Background With the continuous development of photovoltaic technology, the yield of the battery piece continuously rises, and the demand of reducing the cost of key auxiliary materials such as skin films is increasingly urgent. The non-main grid line film coating technology relies on the adsorption force of the skin film and the battery piece to press the welding strip to form ohmic contact so as to replace the traditional infrared welding and realize low-temperature and low-stress interconnection. However, the existing skin film generally adopts a whole adhesive film with the same area as a battery piece, the problems of large resin consumption, redundant thickness and the like when the whole adhesive film is coated with a tape, the material cost is high in proportion to the non-silicon cost of the component, and the existing skin film becomes a main bottleneck for large-scale popularization of the non-main grid line technology. Therefore, developing a new skin membrane with low cost and high reliability is an urgent problem to be solved by those skilled in the art. Disclosure of Invention The invention aims to provide a grid skin membrane and membrane preparation equipment, which meet the requirements of a non-main grid line membrane coating technology on a skin membrane with low cost and high reliability. In order to solve the above technical problems, the present invention provides a mesh skin film for realizing electrical connection between a solder strip and a battery piece, comprising: The longitudinal adhesive films are arranged at intervals along the length direction of the welding strip, and hollow areas are formed between adjacent longitudinal adhesive films; the transverse adhesive films are connected to the end parts of the longitudinal adhesive films; When the battery piece is attached, the welding strips are pressed on the middle area of the longitudinal adhesive film, and the edge areas of the two sides of the longitudinal adhesive film and the transverse adhesive film are adsorbed and fixed with the surface of the battery piece. Optionally, the plurality of longitudinal adhesive films and the transverse adhesive films are enclosed to form a skin film unit, the outline of the skin film unit is matched with the outline of a single battery piece, and the grid skin film comprises at least two skin film units which are arranged continuously and used for covering at least two battery pieces in the same battery string. Optionally, the width of the longitudinal adhesive film is equal to the width of the hollowed-out area, and the center line of each longitudinal adhesive film coincides with the center line of the corresponding welding strip. The present invention provides a film-making apparatus for making the mesh skin film of any one of the above, comprising: A frame; the longitudinal film discharging mechanism is arranged on the frame and comprises a storage chamber, the storage chamber is provided with a discharge hole, and the glue material continuously flows out from the discharge hole to form the longitudinal glue film; The transverse compound mechanism comprises a press roll cavity, wherein the press roll cavity is provided with a glue outlet, the press roll cavity rotates alternately at a first angular speed and a second angular speed, when the glue outlet is in contact with the longitudinal glue film, the press roll cavity rotates at the first angular speed, glue flows out through the glue outlet and forms the transverse glue film, when the glue outlet is separated from the longitudinal glue film, the press roll cavity rotates at the second angular speed, and the next glue outlet is waited to be in contact with the longitudinal glue film again; The double-pressing mechanism comprises a first pressing roller and a second pressing roller which rotate in opposite directions, and a pressing seam is formed between the first pressing roller and the second pressing roller and is used for rolling and shaping the adhesive film after the transverse compounding is completed. Optionally, the lateral wall in compression roller chamber sets up a plurality of protruding cambered surface and concave cambered surface in turn along circumference, the glue outlet is opened in protruding cambered surface, when protruding cambered surface rotate to radial with vertical glued membrane is perpendicular, the surface of protruding cambered surface with vertical glued membrane contact and extrude horizontal glued membrane, when concave cambered surface rotate to radial with vertical glued membrane is perpendicular, the surface of concave cambered surface with vertical glued membrane keeps the clearance. Optionally, the arc length of each convex arc surface is equal, and the arc length of each concave arc surface is equ