阅读说明：本技术 一种负间距密堆光伏组件 (Negative-spacing close-packed photovoltaic module ) 是由 赵志楠 张昌远 何涛 于 2020-10-30 设计创作，主要内容包括：本发明公开了一种负间距密堆光伏组件,包括至少两个依次堆叠的电池串,所述电池串的正面由发射极和导电栅组成,所述电池串的背面设有背电极和铝背场,所述电池串边缘上设有绝缘区域,相邻所述电池串的绝缘区域相互堆叠形成串重叠区域,所述串重叠区域的面积小于绝缘区域的面积,本发明的有益效果为：通过同一电池串边绝缘技术,采用不同电池串互相重叠方式,消除电池串串间距,电池串实现边绝缘后,可在组件电气结构不变的基础上,保留片间距,消除串间距,提高组件电池串密度,提高组件效率。(The invention discloses a negative-spacing close-packed photovoltaic module, which comprises at least two cell strings stacked in sequence, wherein the front surfaces of the cell strings consist of an emitter and a conductive grid, back surfaces of the cell strings are provided with a back electrode and an aluminum back field, the edges of the cell strings are provided with insulating regions, the insulating regions of adjacent cell strings are stacked mutually to form a string overlapping region, and the area of the string overlapping region is smaller than that of the insulating region, so that the negative-spacing close-packed photovoltaic module has the beneficial effects that: through same battery cluster limit insulation technology, adopt different battery cluster mode of overlapping each other, eliminate battery cluster interval, the battery cluster realizes the limit after insulating, can remain the piece interval on the unchangeable basis of subassembly electrical structure, eliminates cluster interval, improves subassembly battery cluster density, improves subassembly efficiency.)

1. A negative pitch close-packed photovoltaic module, characterized in that: including two at least battery strings that pile up in proper order, the front of battery string comprises projecting pole and electrically conductive bars, the back of battery string is equipped with back electrode and aluminium back of the body field, be equipped with insulating region on the battery string edge, and is adjacent the insulating region of battery string piles up each other and forms string overlap region, the area of string overlap region is less than insulating region's area.

2. The negative pitch close-packed photovoltaic module of claim 1, wherein: the insulating region is a high-molecular insulating layer and is arranged on the edge of the battery string in a surface passivation or surface printing mode, and the width of the string overlapping region is smaller than that of the high-molecular insulating layer.

3. The negative pitch close-packed photovoltaic module of claim 2, wherein: the polymer insulating layers are symmetrically arranged on two sides of the front side of the battery string.

4. The negative pitch close-packed photovoltaic module of claim 3, wherein: the polymer insulating layers are symmetrically arranged on two sides of the back of the battery string.

5. The negative pitch close-packed photovoltaic module of claim 3 or 4, wherein: the width of the polymer insulating layer is less than or equal to 5 mm.

6. The negative pitch close-packed photovoltaic module of claim 1, wherein: the insulating region is an insulating pad pasting, and is adjacent be equipped with insulating pad pasting between the battery cluster, the top surface of every insulating pad pasting and the back interconnect of upper battery cluster, the bottom surface of every insulating pad pasting and the front interconnect of lower floor's battery cluster, there is string overlap region in the orthographic projection of upper battery cluster and lower floor's battery cluster on the plane at insulating pad pasting place, the length and the width in string overlap region all are less than the length and the width of insulating pad pasting, string overlap region all is located the regional scope of insulating pad pasting.

7. The negative pitch close-packed photovoltaic module of claim 6, wherein: the insulating film is a continuous film or a sectional film.

8. The negative pitch close-packed photovoltaic module of claim 7, wherein: in the welding process of the battery string, the insulating film is arranged on the front side of the battery string.

9. The negative pitch close-packed photovoltaic module of claim 7, wherein: in the process of typesetting the battery strings, the insulating sticking film is arranged on the back of the battery strings.

Technical Field

The invention belongs to the technical field of solar cells, and particularly relates to a negative-spacing close-packed photovoltaic module.

Background

Traditional close-packed crystalline silicon photovoltaic modules are divided into two types: lamination and stitch welding techniques. The lamination technology adopts conductive adhesive as bonding medium between the battery pieces, and the cut battery pieces are overlapped up and down along the long edge in a 'tiling' mode to form a long battery string without piece spacing; the stitch welding technology adopts conventional 5BB or MBB battery pieces, flattens and shapes welding strips (mainly circular welding strips) among the battery pieces in a welding process, eliminates the distance between battery pieces and realizes the close stacking of the battery pieces.

The disadvantages of the prior close-packed assembly include:

(1) the conductive adhesive material of the tile-stacking technology is immature, the failure possibility exists, and the tile-stacking technology has patent barriers and a small application range.

(2) The overlap welding technology is combined with welding strip flattening and shaping, the thickness of the welding strip at the overlapping part is required to be lower than 0.15mm, the requirement of the overlap welding technology on the matching performance of equipment and the technology is extremely high, the yield strength of the welding strip is improved by secondary flattening and shaping of the welding strip, the risk of lamination fragments is increased by the thicker overlapping part, the overlapping part is a cutting surface of a battery piece, and the risk of subfissure of the battery piece is increased.

Disclosure of Invention

In order to overcome the defects, the invention provides a negative-spacing close-packed photovoltaic module, which eliminates the spacing between cell strings by adopting the mutual overlapping mode of different cell strings through the edge insulation technology of the same cell string, and achieves the aim of close-packed arrangement of the module.

The invention is realized by the following technical scheme: a negative pitch close-packed photovoltaic module, characterized in that: including two at least battery strings that pile up in proper order, the front of battery string comprises projecting pole and electrically conductive bars, the back of battery string is equipped with back electrode and aluminium back of the body field, be equipped with insulating region on the battery string edge, and is adjacent the insulating region of battery string piles up each other and forms string overlap region, the area of string overlap region is less than insulating region's area.

In a preferred embodiment of the present invention, the insulating region is a polymer insulating layer, and is disposed on an edge of the battery string by surface passivation or surface printing, and a width of the string overlapping region is smaller than a width of the polymer insulating layer.

As a preferred technical solution of the present invention, the polymer insulating layers are symmetrically disposed on two sides of the front surface of the battery string.

As a preferred technical solution of the present invention, the polymer insulating layers are symmetrically disposed on two sides of the back of the battery string.

As a preferable technical scheme of the invention, the width of the high polymer insulating layer is less than or equal to 5 mm.

As a preferred technical solution of the present invention, the insulation region is an insulation film, the insulation film is disposed between adjacent battery strings, a top surface of each insulation film is connected to a back surface of the upper battery string, a bottom surface of each insulation film is connected to a front surface of the lower battery string, orthogonal projections of the upper battery string and the lower battery string on a plane where the insulation film is located have a string overlapping region, a length and a width of the string overlapping region are both smaller than a length and a width of the insulation film, and the string overlapping region is located within a region range of the insulation film.

As a preferable technical solution of the present invention, the insulating film is a continuous film or a sectional film.

As a preferable technical solution of the present invention, in the welding process of the battery string, the insulating film is disposed on the front surface of the battery string.

As a preferred technical solution of the present invention, in the typesetting process of the battery string, the insulating film is disposed on the back of the battery string.

Compared with the prior art, the invention has the beneficial effects that: the invention forms a close-packed photovoltaic module with only cell spacing and no string spacing by insulating the cell strings at the edges and mutually overlapping different cell strings, and the cell string edge insulation technology can be realized by designing a special cell screen printing plate, welding a film or positioning and printing, and positioning the film in the assembly process. After the battery string realizes that the limit is insulating, can keep the piece interval on the unchangeable basis of subassembly electrical structure, eliminate the cluster interval, improve subassembly battery string density, improve subassembly efficiency, because do not reduce the piece interval and directly reduce the cluster interval, when realizing that the battery string is close to piling up the range, the overlap region is non-cutting plane, and need not circular solder strip and flatten the plastic, reduces subassembly welding and lamination process piece rate, improves negative pitch subassembly volume production yield.

Drawings

Fig. 1 is a schematic front view of a battery string according to embodiment 1 of the present invention;

fig. 2 is a schematic view of the back side structure of a battery string in embodiment 1 of the present invention;

fig. 3 is a schematic view of the front and back structures of the stacked adjacent cell strings in example 1 of the present invention;

FIG. 4 is a schematic view of a continuous type insulating film according to example 2 of the present invention;

FIG. 5 is a schematic view of a segment-type insulating film in example 2 of the present invention;

fig. 6 is a schematic structural view and a partially enlarged view of a photovoltaic module in example 2 of the present invention;

FIG. 7 is a schematic view of a continuous type insulating film according to example 3 of the present invention;

FIG. 8 is a schematic view of a segment-type insulating film in example 3 of the present invention;

fig. 9 is a schematic structural view and a partially enlarged view of a photovoltaic module in example 3 of the present invention;

list of reference numerals: 1. a battery string; 1-1, an upper layer battery string; 1-2, a lower layer battery string; 2. a polymer insulating layer; 3. a back electrode; 4. an aluminum back field; 5. A string overlap region; 6. and (5) insulating and pasting the film.

Detailed Description

The present invention will be further illustrated with reference to the accompanying drawings and specific embodiments, which are to be understood as merely illustrative of the invention and not as limiting the scope of the invention. It should be noted that the terms "front," "back," "left," "right," "upper" and "lower" used in the following description refer to directions in the drawings, and the terms "inner" and "outer" refer to directions toward and away from, respectively, the geometric center of a particular component.

The invention forms a close-packed photovoltaic module with only cell spacing and no string spacing by insulating the cell strings at the edges and mutually overlapping different cell strings, and the cell string edge insulation technology can be realized by designing a special cell screen printing plate, welding a film or positioning and printing, and positioning the film in the assembly process. After the battery string realizes that the limit is insulating, can keep the piece interval on the unchangeable basis of subassembly electrical structure, eliminate the cluster interval, improve subassembly battery string density, improve subassembly efficiency, because do not reduce the piece interval and directly reduce the cluster interval, when realizing that the battery string is close to piling up the range, the overlap region is non-cutting plane, and need not circular solder strip and flatten the plastic, reduces subassembly welding and lamination process piece rate, improves negative pitch subassembly volume production yield.

As an embodiment of the present invention, as shown in fig. 1-2, a negative pitch close-packed photovoltaic module includes at least two cell strings 1 stacked in sequence, the front side of the cell string 1 is composed of an emitter and a conductive grid, the back side of the cell string 1 is provided with a back electrode 3 and an aluminum back field 4, the edge of the cell string 1 is provided with an insulating region, the insulating regions of adjacent cell strings are stacked to form a string overlapping region 5, the area of the string overlapping region 5 is smaller than that of the insulating region, the insulating region is a polymer insulating layer 2, and is disposed on the edge of the cell string 1 by surface passivation or surface printing, the width of the string overlapping region is smaller than that of the polymer insulating layer, the width of the polymer insulating layer 2 is less than or equal to 5mm, the polymer insulating layer 2 is symmetrically disposed on both side edges of the front side of the cell string 1, the insulating effect of the edge of the battery string 1 is achieved, meanwhile, the refractive index of the surface of the battery string cannot be affected by the polymer insulating layer 2, the light transmittance of the battery string is not affected, in order to improve the universality of the battery string, the laying flexibility of the battery string 1 is improved, the battery string 1 is symmetrically designed, the polymer insulating layers 2 are symmetrically designed in the same size in the left and right directions, the width of each polymer insulating layer 2 is smaller than or equal to 5mm, the optimal width of each polymer insulating layer in the left and right symmetry is smaller than or equal to 2.5mm, as shown in fig. 3, the adjacent edges of the two battery strings 1 are overlapped up and down, the adjacent battery strings 1 are welded by using a circular welding strip and a normal sheet interval (the sheet interval is larger than or equal to 1.5 mm), the width of a string overlapping area 5 between the adjacent battery strings 1 is smaller than the width.

When the polymer insulating layer is arranged on the front surface of the battery string 1, the back surface of the battery string 1 can be selected without special treatment, or the symmetrical polymer insulating layer 2 is arranged on the back surface of the battery string 1, so that the insulating property of the overlapped part of the battery string 1 is improved. When the front surface of the battery string 1 is not provided with the insulation region 3, the back surface of the battery string 1 must be designed with the symmetrical polymer insulation layer 2, wherein the width of the polymer insulation layer is less than or equal to 5mm, and the insulation material of the polymer insulation layer 5 on the back surface of the battery string 1 has no light transmittance limitation and is required to have good insulation.

As an example of the present invention, as shown in fig. 4-6, in the welding process of the battery string 1, the insulating adhesive film 6 is disposed on the front surface of the battery string 1, the insulating region is the insulating adhesive film 6, the insulating adhesive film 6 is disposed between the adjacent battery strings 1, the top surface of each insulating adhesive film 6 is connected to the back surface of the upper battery string 1-1, the bottom surface of each insulating adhesive film 6 is connected to the front surface of the lower battery string 1-2, the projection of the upper battery string 1-1 and the lower battery string 1-2 on the plane of the insulating adhesive film 6 has a string overlapping region 5, whether a continuous insulating adhesive film (as shown in fig. 4) or a sectional adhesive film (as shown in fig. 5) is adopted, the length and the width of the string overlapping region 5 are both smaller than those of the insulating adhesive film 6, the string overlapping region 6 is located within the region of the insulating adhesive film 6, and the adjacent battery strings 1 are ensured to be insulated from the battery piece with the same potential.

As an embodiment of the present invention, as shown in fig. 7-9, a back-side film-pasting mode is adopted in an assembly laying link, and in the process of composing the battery strings 1, the insulating film 6 is arranged on the back side of the battery strings, wherein six groups of battery strings 1 are stacked in sequence from bottom to top, adjacent battery strings 1 are connected by the insulating film, no matter a continuous insulating film (as shown in fig. 7) or a sectional film (as shown in fig. 8) is adopted, the length and the width of the string overlapping region 5 are both smaller than the length and the width of the insulating film 6, and the string overlapping region 6 is located in the region range of the insulating film 6, so as to ensure that the adjacent battery strings 1 are insulated from the same-potential battery pieces.

Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.