CN211182220U

CN211182220U - A battery piece for half lamination tile photovoltaic module

Info

Publication number: CN211182220U
Application number: CN201921848421.4U
Authority: CN
Inventors: 秦涛涛; 杜军伟; 庄磊武; 寇惠芳
Original assignee: Jiangsu Landao New Energy Co ltd
Current assignee: Jiangsu Landao New Energy Co ltd
Priority date: 2019-10-30
Filing date: 2019-10-30
Publication date: 2020-08-04
Anticipated expiration: 2029-10-30

Abstract

The utility model provides a battery piece for half lamination tile photovoltaic module, battery front electrode includes upper and lower two parts, upper portion and lower part are each other central symmetry, upper and lower two parts middle zone does not have the grid line and connects, this region is the wave, the positive main grid line of battery upper portion distributes at the trough center, the positive main grid line of battery lower part distributes at the crest center, half lamination tile photovoltaic module includes battery piece burst and welds the area, wherein the battery piece burst is obtained after being two the same bursts by the battery piece through laser cutting, the anodal of battery piece burst and the negative pole of adjacent battery piece burst are connected with welding the area, the edge of adjacent battery piece burst overlaps simultaneously. Compared with the prior art, the beneficial effects of the utility model reside in that: by changing the overlapping area between the cell slices in the half-piece laminated tile assembly into wave-shaped overlapping, the overlapping area of the cell slices is reduced, and higher assembly power and better assembly reliability are realized.

Description

A battery piece for half lamination tile photovoltaic module

Technical Field

The invention relates to the technical field of photovoltaics, in particular to a cell for a half-laminated tile photovoltaic module.

Background

The half-sheet photovoltaic module technology and the shingled photovoltaic module technology are two important development directions of the current high-efficiency solar module technology. The half-piece photovoltaic module technology adopts laser scribing equipment to equally divide a battery piece into two battery piece pieces, so that the internal resistance loss of the module is reduced, and the power of the module is improved.

The invention relates to a cell for a half-laminated tile photovoltaic module and a module manufacturing method, which can integrate a half-lamination technology and a tile lamination technology, obtain a higher-power module and further improve the power and the reliability of the module.

Specifically, the stack assembly overlaps the edges of adjacent cells, wherein the edge of the front side of one cell is placed at the edge of the back side of the adjacent cell, and the front electrode and the back electrode of the other cell are electrically and mechanically connected by using a tin-plated brazing tape.

In the current photovoltaic industry, a laser scribing area in the middle of a cell of a half-laminated tile photovoltaic module is linear, and more parts of the overlapping area of the cell slices are shielded, so that the power of the module is lost.

In view of the foregoing, there is a need for an improved cell design for a half-shingled photovoltaic module and a method for making the module.

Disclosure of Invention

In order to solve the problems, the invention provides a cell piece for a half-piece laminated tile photovoltaic module, which comprises a cell piece with a wave-shaped laser scribing area, wherein the scribing edge of the cell piece after the cell piece is cut by laser has a wave shape.

In order to achieve the above purpose, the invention provides the following technical scheme:

a cell for a half-tile laminated photovoltaic module is characterized in that the front side of the cell comprises a front side main grid line, a front side fine grid line and a middle laser scribing area. The front main grid lines and the front fine grid lines are perpendicular to each other and intersect, the head end and the tail end of the front main grid lines are of a bifurcated structure, the front main grid lines and the front fine grid lines comprise two parts which are vertically and centrosymmetrically, the front main grid lines on the upper portion and the front main grid lines on the lower portion of the half-laminated tile battery are distributed in a crossed and parallel mode, the middle area of the upper portion and the lower portion is a front laser scribing area, and the parts are not connected with the grid lines.

Specifically, the number of the grid lines of the front main grid line is five grid lines, six grid lines, nine grid lines and twelve grid lines.

Specifically, the width of the grid line of the front main grid line is 0.05-0.8 mm.

Specifically, the grid lines of the front main grid lines are of a solid or hollow structure.

Specifically, the width of the front laser scribing region 103 is 0.3-3 mm.

The manufacturing method of the half-laminated tile photovoltaic module is characterized by comprising the following steps:

A) preparing a certain number of battery pieces;

B) cutting along the laser scribing area by using laser scribing equipment to prepare a battery piece, wherein the laser cutting route is wavy;

preferably, when the battery piece is cut by laser, the laser acts on the back surface of the battery piece, and the position of the area corresponds to the front laser scribing area;

preferably, 1024nm wavelength laser is adopted, the width of a laser heat affected zone is less than 110um, the cutting depth is 50% +/-10% of the thickness of the battery piece, and then the battery piece scribed by the laser is cut into 2 battery piece segments by a mechanical segment breaking tool;

preferably, the battery piece is cut into 2 battery piece pieces 104 after laser scribing, and the upper part is completely the same as the lower part after 180-degree rotation;

preferably, the laser cutting route is wavy, and the vertical distance between a wave crest and a wave trough is 0.3-3 mm;

C) preparing a tinned copper welding strip, stamping a specific area in the middle of the welding strip by adopting a tool after the welding strip is straightened, stamping and thinning the specific area from a certain thickness to a specific thickness, and then welding the tinned copper welding strip to the front and back main grid lines of the battery piece by utilizing battery piece welding equipment;

preferably, the cross section of the tin-plated copper welding strip is rectangular or circular, the specific thickness of the tin-plated copper welding strip is determined according to the situation, the total thickness range is 0.12-0.4 mm, the total thickness of a tin-plated layer is 0.015-0.08 mm, and the thickness of a stamping area is reduced to 0.07-0.15 mm;

furthermore, the thickness of the punched area of the tinned copper welding strip is reduced, but the width of the punched area is increased, the total cross-sectional area is basically unchanged, and in order to improve the mechanical load performance of the half-laminated tile photovoltaic module, the punched area can be punched, and the punched area can be in a diamond shape, a rectangular shape, a circular shape or an oval shape;

specifically, a stamping area of the tinned copper welding strip is a non-welding area, the area is in contact with an overlapping area of adjacent cell slice fragments, the stamping length of the tinned copper welding strip needs to be ensured to be larger than the width of the overlapping area of the adjacent cell slice fragments, the tinned copper welding strip area is a welding area, the area is in contact with front and back electrodes of the cell slice fragments and is welded together at high temperature, and the welding temperature is 185-380 ℃;

furthermore, the welding strip stamping area can have various cross-sectional shapes, when the cross section of the stamping area is S-shaped, the cross section of the welding strip can ensure that the overlapping height between adjacent battery pieces is minimum, and when the cross section of the stamping area is concave, the cross section of the welding strip can ensure that the laser scribing area of the battery pieces is not contacted with the welding strip, so that the reliability of the assembly can be improved, and the short circuit risk of the battery pieces can be reduced;

D) utilize the manipulator to overlap together two accurate superpositions in welded battery piece burst edge, weld and take and openly extend to the back of adjacent battery piece from the battery piece burst, adjacent battery piece burst overlapping region is the wave, this design can guarantee to weld the area of taking and battery piece burst overlapping region simultaneously, reduce the area in other invalid overlapping regions, can effectively improve the subassembly power, it is bigger to weld the area of taking and battery piece burst contact, it is smaller to weld the pressure of taking to the battery piece burst, the subassembly reliability is higher.

Specifically, the overlapping width of the edges of adjacent battery pieces is 0.2-3.0 mm;

preferably, the overlapping precision of the slicing edges of the adjacent battery slices is +/-100 um;

E) d, repeating the step D to finish manufacturing of the half-laminated-tile battery strings, connecting the different battery strings in series or in parallel by adopting bus bars, and welding bypass diodes between the adjacent bus bars to protect the battery pieces;

specifically, the number of battery plates of the battery strings on the upper half part and the lower half part of the assembly is equal;

specifically, the number of battery pieces of each string of battery strings is 6-14;

preferably, the bus bar 210 is a tin-plated copper welding strip, the width of the tin-plated copper welding strip is 3-8 mm, and the thickness of the tin-plated copper welding strip is 0.12-0.45 mm;

F) and E, assembling the laminated battery string obtained in the step E by adopting glass, a packaging adhesive film, a back plate, a junction box, a frame and sealant, and laminating into a component.

Specifically, the glass is ultra-white rolled toughened glass with the thickness of 2.0-4.0 mm;

preferably, the glass surface can be plated with an anti-reflection film to improve the transmittance of incident light;

preferably, the packaging adhesive film is EVA and has a two-layer structure, and the two-layer structure is respectively positioned on the glass surface and the back plate surface;

compared with the prior art, the invention has the beneficial effects that: compared with the conventional half laminated tile battery, the half laminated tile battery has the advantages that the edge of the half laminated tile battery sheet is cut in a wave shape, so that the width of the assembly in the overlapping area of the welding strips is effectively increased, the area of the non-welding strip overlapping area is reduced, the reliability of the assembly is improved, and the power of the assembly is increased.

Drawings

Fig. 1 is a schematic front screen of a battery piece according to the present invention.

Fig. 2 is a schematic diagram of a front screen for separating the battery piece according to the present invention.

Fig. 3 is a schematic view showing the overlapping of the cell segments (wave shape) in the present invention.

Fig. 4 is an overlapped schematic view (straight line type) of the cell sheet segments in the present invention.

Fig. 5 is a schematic view of the processing of the welding strip for welding the battery piece in the invention.

Fig. 6 is an overlapped schematic view of the battery piece segments in the present invention.

Fig. 7 is an enlarged schematic view of the overlap region of fig. 6 in the S-shape and concave shape.

Fig. 8 is a schematic view of a half-shingled photovoltaic module of the present invention.

Fig. 9 is a schematic circuit structure diagram of a half-laminated photovoltaic module according to the present invention.

Fig. 10 is a schematic diagram of a front screen of a half tile-stacked photovoltaic cell in the present invention.

List of reference numerals:

100-cell piece, 101-front major grid line, 102-front fine grid line, 103-laser scribing region, 104-cell piece, 105-wave shape, 106-half tile-stacked photovoltaic module, 108-overlapping region, 109-conventional half tile-stacked cell string, 201-solder strip, 202-solder strip stamping region, 203-solder strip welding region, 207-diode solder point a, 208-diode solder point b, 209-diode solder point c, 2141-cell string a, 2142-cell string b, 2143-cell string c, 2144-cell string d, 2145-cell string e, 2146-cell string f, 210-bus bar, 211-anode lead-out line, 212-cathode lead-out line, 213-bypass diode, 2151-cell string g, 2152-battery string h, 2153-battery string i, 2154-battery string j, 2155-battery string k, 2156-battery string l.

Detailed Description

The present application will now be described in detail with reference to specific embodiments thereof as illustrated in the accompanying drawings. These embodiments are not intended to limit the present application, and structural, methodological, or functional changes made by those skilled in the art according to these embodiments are included in the scope of the present application.

In the various drawings of the present application, some dimensions of structures or portions are exaggerated for convenience of illustration with respect to other structures or portions, and thus, are used only to illustrate the basic structure of the subject matter of the present application.

Also, terms such as "upper", "lower", and the like used herein to denote relative spatial positions are used for convenience of description to describe one element or feature's relationship to another element or feature as illustrated in the figures. The spatially relative positional terms may be intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if an element in the figures is turned over, elements described as "below" or "above" other elements or features would then be "above" the other elements or features. Thus, the exemplary term "lower" can encompass both an orientation of upper and lower. The device may be otherwise oriented (rotated 90 or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

Example 1: manufacturing of half laminated tile battery piece

As shown in fig. 1, a front screen for a half tile-stacked photovoltaic module comprises a front main grid line 101, a front fine grid line 102 and a middle laser scribing region 103, wherein the front main grid line 101 and the front fine grid line 102 are perpendicular to each other and intersect, the two ends of the front main grid line 101 at the head and the tail are in a bifurcated structure, the front main grid line 101 and the sub-grid line 102 comprise two parts which are vertically and centrally symmetrical, the upper front main grid line 101 and the lower front main grid line 101 of the half tile-stacked photovoltaic module 100 are in crossed parallel distribution, the middle region of the upper part and the lower part is the front laser scribing region 103, the part is not connected with grid lines, the number of the front main grid lines is 5, the width is 0.6mm, the distance between the front main grid lines is 31.35mm, the distance between the left main grid lines of the upper half part and the left main grid lines of the upper half part is 23.5mm, the distance between the right main grid lines of the upper half part and the right main grid lines of the upper half part is 7.85mm, the battery piece is divided into an upper part and a lower part, and the lower part is formed by rotating the. The number of the thin grid lines on the front surface is 110, the upper half part is 55, the lower half part is 55, the width of the thin grid lines is 50um, and the width of the laser scribing area 103 is 3 mm.

As shown in fig. 2, laser scribing equipment is used for performing laser cutting along a scribing path 105, the laser power is 50W, the wavelength is 1024nm, the laser cutting action during the laser cutting corresponds to the front laser scribing region 103 on the back surface of the cell, the wavy scribing path is composed of arcs with the radius of 31.2mm, the main grid lines of the upper half of the cell are distributed in the wave troughs, and the main grid lines of the lower half of the cell are distributed in the wave crests. The laser scribing depth is 50% +/-10%, and after scribing, the cell pieces are broken along the scribing channels by a mechanical arm to obtain the same 2 cell piece fragments.

Example 2: manufacturing of half laminated tile battery piece

As shown in fig. 10, a half tile-stacked battery piece front screen includes a front main gate line 101, a front fine gate line 102, and a middle laser scribing region 103, where the front main gate line 101 and the front fine gate line 102 are perpendicular to each other and intersect with each other, the two ends of the front main gate line 101 at the head and the tail are in a bifurcated structure, the front main gate line 101 and the sub-gate line 102 include two parts that are vertically and centrally symmetric, the front main gate line 101 at the upper part and the front main gate line 101 at the lower part of the half tile-stacked battery piece 100 are in a crossed parallel distribution, and the middle region of the upper part and the lower part is the front laser scribing region 103, where the two parts. The number of the front main grid lines is 5, the width of the front main grid lines is 0.6mm, the distance between the front main grid lines is 31.35mm, the distance between the left main grid lines on the upper half part and the left main grid lines on the upper half part is 19.6mm, the distance between the right main grid lines on the upper half part and the right main grid lines on the upper half part is 11.75mm, the battery piece is divided into an upper part and a lower part, and the lower part is formed. The number of the thin grid lines on the front surface is 110, the upper half part is 55, the lower half part is 55, the width of the thin grid lines is 50um, and the width of the laser scribing area 103 is 3 mm. Adopt laser scribing equipment to carry out laser cutting along scribing route 103, laser power 50W, the wavelength 1024nm, laser cutting effect corresponds with front laser scribing region 103 at the battery piece back during laser cutting, the wave scribing route comprises the circular arc of radius 8.2mm, the first half battery piece main grid line distributes in the trough, the latter half battery piece main grid line distributes in the crest, 2 crests or troughs are separated between the adjacent main grid, the laser scribing degree of depth is 50% +/-10%, adopt the manipulator to break off the battery piece along the scribing street after the scribing, obtain the same 2 battery piece fragmentations.

Example 3: manufacturing method of half-laminated tile photovoltaic module

The manufacturing method of the half-laminated tile photovoltaic module comprises the following steps:

A) preparing 66 battery pieces, wherein the side length of each battery piece is 156.75mm, the thickness of each battery piece is 180 mu m, the number of main grid lines is 5, and the screen printing plate pattern on the front surface of each battery piece is as described in embodiment 2;

B) cutting along a laser scribing area 103 by using laser scribing equipment to prepare half-piece laminated tile battery piece fragments 104, wherein the laser cutting route is in a wave shape 105; the laser acts on the back surface of the cell to avoid damaging PN junctions, the laser wavelength is 1024nm, the laser power is 50W, the laser waveform is 0# waveform, the width of a heat affected zone is 105um, and the cutting depth is 50%, then the cell scribed by the laser is cut into 2 pieces of pieces by a mechanical piece breaking tool, the half part of the cell is rotated by 180 degrees, and 132 pieces of cell pieces are obtained, the laser scribing channels are wavy, and the vertical distance between the wave crest and the wave trough is 2.0 mm;

C) preparing a tin-plated copper welding strip 201, stamping a welding strip stamping area 202 in the middle of the welding strip by using a tool after the welding strip is straightened, stamping and thinning the welding strip stamping area 202 to a specific thickness from a certain thickness, and then welding a welding strip welding area 203 to the front and back main grid lines of the cell piece by using cell piece welding equipment; the cross section of the tin-plated brazing strip is a rectangle with the width of 0.9mm and the thickness of 0.25mm, the length of a stamping area is 3.0mm, the thickness is reduced to 0.12mm from 0.25mm after stamping, and the width is increased to 1.9 mm. As shown in fig. 4, the length of the welding strip is 135mm, wherein about 70.5mm is laid on the front main grid line of the battery piece in the middle, the remaining 64.5mm is laid on the back main grid line of the adjacent battery piece, the welding strip is welded on the front main grid line and the back main grid line of the battery piece by adopting an infrared heating mode, the welding temperature is 240 ℃, the welding time is 1.5s, and the welding point of the front welding strip of the battery piece is close to the laser scribing channel.

D) Utilize the manipulator to overlap together two accurate superposes of welded battery piece edge, as shown in fig. 3, weld area 107 and extend to the back of adjacent battery piece from the battery piece front, adjacent battery piece burst overlap region 108 is the wave, this design can guarantee to weld the area of area and battery piece overlap region simultaneously, reduces other invalid overlap region's area, can effectively improve subassembly power, it is bigger to weld area of contact with the battery piece, it is smaller to weld the pressure of area to the battery piece, the subassembly reliability is higher. Fig. 4 shows a conventional half-shingled cell string 109, wherein the overlapping area between adjacent cells is rectangular, and the area of the overlapping area between the cells is larger under the condition of the same contact area between the solder strip and the cells. The overlapping width of the edges of the adjacent battery pieces is 2.0mm, and the overlapping precision of the edges of the adjacent battery pieces is +/-100 um;

E) and D, repeating the step D to finish the manufacture of the half-laminated-tile battery string, arranging 12 battery strings according to the distribution shown in fig. 8, if 3 is shown, stitch-welding 11 battery piece sub-pieces 104 into the battery string through a welding strip 201, arranging into a module according to the distribution shown in fig. 8, connecting different battery strings in series or in parallel through bus bars 210, welding bypass diodes between adjacent bus bars to protect the battery pieces, and totally having 3 diode welding points (207, 208 and 209), wherein the anode leading-out wire of the module is at a diode welding point a207, and the cathode leading-out wire is at a diode welding point c 209. The equivalent circuit of the module is shown in fig. 9, a battery string a2141, a battery string b2142, a battery string c2143, a battery string d2144, a battery string e2145 and a battery string f2146 are connected in series to form the upper half part of the module, a positive electrode lead wire is 211, a negative electrode lead wire is 212, a battery string g2151, a battery string h2152, a battery string i2153, a battery string j2154, a battery string k2155 and a battery string l2156 are connected in series to form the lower half part of the module, a positive electrode lead wire is 211, a negative electrode lead wire is 212, the upper half part and the lower half part of the module are connected in parallel, and 3 bypass diodes 213 are adopted to protect the battery pieces. The number of battery pieces of the battery strings on the upper half part and the lower half part of the component is equal, the bus bar 210 is a tin-plated copper welding strip, the width is 5mm, and the thickness is 0.4 mm;

F) and E, assembling the laminated battery string obtained in the step E by adopting glass, a packaging adhesive film, a back plate, a junction box, a frame and sealant, and laminating into a component. The glass is super white rolled toughened coated glass with the thickness of 3.2mm, and the coating layer is SiO with the optical thickness of 650nm₂The size of the glass is 1750 x 986mm, the transmissivity is more than or equal to 94.1 percent, the glass is packaged by adopting 2 layers of EVA (ethylene vinyl acetate) adhesive films, the EVA adhesive film close to the glass surface has low absorptivity to the ultraviolet wave band of sunlight so as to improve the power of the component, and the gram weight of the EVA is 500g/m²The EVA adhesive film close to the back plate surface has high absorptivity to the ultraviolet wave band of the sun so as to prolong the service life of the back plate, and the EVA has the gram weight of 480g/m²(ii) a The back plate is a KPF structure back plate. After the assembly is completed, the assembly is placed into a laminating machine, and the laminating temperature is 141 ℃ and the laminating time is 15 min.

Compared with the conventional half laminated tile battery, the half laminated tile battery has the advantages that the edge of the half laminated tile battery is cut in a wave shape, so that the width of the assembly in the overlapping area of the welding strips is effectively increased, the area of the non-welding strip overlapping area is reduced, the reliability of the assembly is improved, and the power of the assembly is increased.

The technical means disclosed in the invention scheme are not limited to the technical means disclosed in the above embodiments, but also include the technical scheme formed by any combination of the above technical features. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of the present invention, and such improvements and modifications are also considered to be within the scope of the present invention.

Claims

1. A battery piece for half lamination tile photovoltaic module which characterized in that: the front side of the battery piece comprises a front main grid line, a front fine grid line and a middle laser scribing area, wherein the front main grid line and the front fine grid line are perpendicular to each other and are arranged in an intersecting mode, the head end and the tail end of the front main grid line are in a forked mode, the front main grid line above the laser scribing area and the front main grid line below the laser scribing area are parallel to each other and are arranged in a staggered mode, the laser scribing area is wavy, the front main grid line above the laser scribing area is distributed at the wave trough position of the laser scribing area, and the front main grid line below the laser scribing area is distributed at the wave crest position of the laser scribing area.

2. The cell sheet for a half-shingled photovoltaic module according to claim 1, wherein: the laser scribing area is in a sine wave shape, and the distance between two wave crests is separated between two adjacent front main grids.

3. The cell sheet for a half-shingled photovoltaic module according to claim 2, wherein: the relative vertical distance between the wave crest and the wave trough is 0.2-2 mm.

4. The cell sheet for a half-shingled photovoltaic module according to claim 1, wherein: the areas of two parts of the front surface of the battery, which are positioned above and below the laser scribing area, are the same, and each part forms a battery piece.

5. The cell sheet for a half-shingled photovoltaic module according to claim 1, wherein: the half-laminated-tile photovoltaic module comprises battery piece sub-pieces and a welding strip, wherein the positive electrodes of the battery piece sub-pieces are connected with the negative electrodes of the adjacent battery piece sub-pieces through the welding strip, the edges of the adjacent battery piece sub-pieces are overlapped, the edge of one of the two battery piece sub-pieces in the overlapped area is wavy, and the edge of the other battery piece sub-piece is linear.

6. The cell sheet for a half-laminated-tile photovoltaic module as claimed in claim 5, wherein: the cross section of the welding strip in the half laminated tile photovoltaic module is a rectangular or circular tinned copper welding strip.

7. The cell sheet for a half-laminated-tile photovoltaic module as claimed in claim 5, wherein: the thickness of a welding strip at the overlapping part of the battery piece in the half-piece laminated tile photovoltaic module is 0.07-0.15 mm.

8. The cell sheet for a half-laminated-tile photovoltaic module as claimed in claim 5, wherein: the overlapping width of two adjacent battery piece sub-pieces in the half-piece tile-stacked photovoltaic module is 0.1-1.8 mm.