Electrically conductive material, photovoltaic module, and preparation method for electrically conductive material

1 . A conductive material configured for connecting to at least two adjacent cells, comprising an adhesive film and a conductive wire;

wherein the adhesive film comprises an intact portion and an opening portion connected to each other, the opening portion comprises a first surface of the opening portion and a second surface of the opening portion, the intact portion comprises a first surface of the intact portion and a second surface of the intact portion, a first surface of the opening portion and a first surface of the intact portion are adjacent to the conductive wire, and a plurality of openings are arranged spaced from each other in the opening portion;

the at least two adjacent cells comprises a first cell and a second cell, the first cell is fixed to the first surface of the intact portion, and the second cell is fixed to the second surface of the opening portion,

the conductive wire comprises a first part of the conductive wire and a second part of the conductive wire,

the first part of the conductive wire is in contact with and fixed to the first surface of the intact portion, and is in contact with the first cell;

the second part of the conductive wire is in contact with and fixed to the first surface of the opening portion, the second part of the conductive wire bends to define a plurality of protrusions, the plurality of protrusions are inserted into the plurality of openings in a one-to-one correspondence manner and in contact with the second cell,

wherein the plurality of openings comprise a slit, the slit comprises a non-break position and a break position, the non-break position is configured for keeping the adhesive film at the slit from being separated from the adhesive film, and the conductive wire fixed on the first surface of the adhesive film is electrically connected to the cell fixed on the second surface of the adhesive film via break position of the slit.

2 . The conductive material of claim 1 , wherein a connecting line of non-break positions of a plurality of slits in a same row is parallel to a length direction of the conductive wire, and the break position of each of the plurality of slits is located at the same side of the non-break position along a direction perpendicular to the length direction of the conductive wire.

3 . The conductive material of claim 1 , wherein each of the plurality of openings is in a foundation shape, or in a shape formed by a plurality of foundation shapes, and the foundation shape comprises circle, ellipse, parallelogram, triangle or trapezoid.

4 . The conductive material of claim 1 , wherein the conductive wire is bent at a joint of the intact portion and the opening portion to form a step-like structure, and the intact portion is parallel to the opening portion; and

the conductive wire is bent at a right angle or an obtuse angle.

5 . The conductive material of claim 1 , wherein a material of the adhesive film is selected from the group consisting of PE, PP, PA, TPO, TPU, silica gel, ETFE, EVA, PVB, POE, and any combination thereof; optionally wherein

a material of the adhesive film is selected from the group consisting of composite membranes of EVA and POE, composite membranes of EVA and PET, composite membranes of POE and PET, and any combination thereof.

6 . The conductive material of claim 5 , wherein a substrate of the conductive wire is selected from the group consisting of a copper wire, an aluminum wire, a silver wire, a copper-aluminum co-extruded alloy wire, a copper-clad aluminum alloy wire, and any combination thereof, a surface of the substrate is provided with an electrically conductive adhesive coating layer, and the electrically conductive adhesive coating layer is selected from the group consisting of a tin layer, a silver layer, a tin-lead alloy layer, a tin-lead-silver alloy layer, a tin-lead-bismuth alloy layer, and any combination thereof.

7 . The conductive material of claim 6 , wherein a part of the conductive wire is inserted into the adhesive film, and a depth of the conductive wire inserted into the adhesive film is in a range of ⅓ times to ⅔ times of a diameter of the conductive wire.

8 . The conductive material of claim 1 , wherein a plurality of the conductive wires parallel to each other are fixed on the adhesive film.

9 . The conductive material of claim 8 , wherein a width of the adhesive film is in a range of 30 mm to 500 mm, a length of the adhesive film is in a range of 150 mm to 1500 mm, the number of the plurality of conductive wires is in a range of 2 to 150, and a spacing between adjacent two of the plurality of conductive wires is in a range of 10 mm to 100 mm.

10 . The conductive material of claim 1 , wherein a side of the conductive wire adjacent to the adhesive film is provided with a spot-shaped protrusion or a stripe-shaped protrusion.

11 . The conductive material of claim 1 , wherein the adhesive film comprises a glass fiber or a non-woven fabric inside.

12 . The conductive material of claim 1 , wherein the adhesive film is transparent or semitransparent.

13 . A photovoltaic module, comprising a cell string layer and two encapsulation layers disposed at opposite sides of the cell string layer, respectively, wherein the cell string layer comprises a plurality of cells, and adjacent two of the plurality of cells are connected to each other in series by a conductive material;

the conductive material comprises an adhesive film and a conductive wire;

wherein the adhesive film comprises a first surface and a second surface away from each other, and the conductive wire is electrically connected to an electrode of the cell fixed on the first surface of the adhesive film; and

the adhesive film is provided with at least one opening, and the conductive wire is capable of being connected to an electrode of another cell fixed on the second surface via the at least one opening,

wherein the at least one of openings comprise a slit, the slit comprises a non-break position and a break position, the non-break position is configured for keeping the adhesive film at the slit from being separated from the adhesive film, and the conductive wire fixed on the first surface of the adhesive film is electrically connected to the cell fixed on the second surface of the adhesive film via break position of the slit.

14 . A method for preparing the conductive material of claim 1 , comprising following steps:

providing a row of slits on the adhesive film;

moving the conductive wire to the first surface of the adhesive film and to a position corresponding to the row of the slits;

fixing the conductive wire on the first surface of the adhesive film and to the adhesive film at the row of the slits; and

pressing the conductive wire until the conductive wire is inserted into break positions of the row of the slits and partially aligned with the second surface of the adhesive film, and obtaining the conductive material.