CN211182228U

CN211182228U - Half tile-stacking assembly

Info

Publication number: CN211182228U
Application number: CN201921847106.XU
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 half-laminated tile assembly, wherein a front electrode of a battery piece comprises an upper part and a lower part, and the middle area of the upper part and the lower part is not connected with a thin grid line; the back electrode of the cell comprises an upper part and a lower part, and the middle area of the upper part and the lower part is free of an aluminum back field and a main grid line; half lamination tile subassembly is formed by the battery piece burst and welds the area, wherein the battery piece burst is obtained after the battery piece is cut into two the same battery piece bursts through laser by the battery piece, the positive pole of battery piece burst is connected with the welding strip for the negative pole of adjacent battery piece burst, the welding strip of adjacent battery piece burst overlap department carries out punching press and handles in order to reduce the thickness of overlap department welding strip, the welding strip that distributes in the battery piece burst back and is close to the overlap department simultaneously is circular arc or S type after the plastic in order to reduce expend with heat and contract with cold or the tensile force of welding strip to the battery piece when deforming. Has the advantages that: the welding crack rate of the half-laminated assembly is reduced, the defect of high mechanical load resistance is overcome, and higher production yield and better assembly reliability are realized.

Description

Half tile-stacking assembly

Technical Field

The invention relates to the technical field of photovoltaics, in particular to a half-laminated tile assembly.

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 equally divides the cell into 2 cell pieces by adopting laser scribing equipment, so that the internal resistance loss of the module is reduced, and the power of the module is improved.

The manufacturing method for the half-laminated tile photovoltaic module can integrate the half-chip technology and the tile laminating technology, obtain a higher-power module and further improve the power and the reliability of the module.

Specifically, the half laminated tile assembly overlaps the edges of the adjacent battery pieces, wherein the edge of the front side of one battery piece is arranged at the edge of the back side of the adjacent battery piece, and the front side electrode and the back side electrode of the other battery piece are electrically and mechanically connected by adopting a tin-plated copper welding strip.

In the current photovoltaic industry, welding strips connected between half-piece component battery pieces and the battery pieces are in linear connection and have no buffer structure, so that the welding fragment rate is high in the component manufacturing process, thermal stress and deformation stress generated in the actual use process of the component are easy to cause hidden cracking of the component battery pieces, and the reliability of the component is reduced. The battery plates of the laminated assembly are connected by using the conductive adhesive, the gluing process of the conductive adhesive is complex, the process control difficulty is high, the components of the conductive adhesive are organic materials, and the aging resistance of the assembly manufactured by using the conductive adhesive is lower than that of the assembly welded by using a welding strip.

In view of the above, there is a need for an improved method of making a half-laminated tile assembly.

Disclosure of Invention

In order to solve the problems, the invention provides a half-laminated tile photovoltaic module which comprises a cell slice, wherein a laser scribing area is arranged in the middle of the cell slice, two identical cell slice slices are obtained after the cell slice is cut by laser, two adjacent cell slice slices are connected together by using a welding belt, the welding belt is provided with an arc-shaped or S-shaped deformation buffer area after being punched and shaped, and the design can effectively reduce the welding fragment rate of the half-laminated tile module and the heat stress and deformation resistance of the module, and increase the reliability and power of the half-laminated tile module.

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

a half shingle assembly, the half shingle cell front face consisting essentially of: positive main grid line, positive vice grid line, positive laser scribing district, positive main grid line and positive vice grid line mutually perpendicular and crossing, the head and the tail both ends of positive main grid line are the bifurcation structure, and positive main grid line and positive vice grid line include two parts of central symmetry from top to bottom, and half positive main grid line of the last part of tile-stacked battery piece is crossing parallel distribution with the positive main grid line of lower part, and the middle zone of upper and lower part is positive laser scribing district, and this part does not have the grid line connection, half tile-stacked battery piece back mainly includes: the back main grid line, the back aluminum back field and the back laser scribing region correspond to the front main grid line in position, the back main grid line of the upper part and the back main grid line of the lower part are two sections, and the length of the main grid section close to the middle laser scribing channel is smaller than that of the other section.

Specifically, the number of the grid lines of the front main grid line can be 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 area is 0.3-3 mm.

Specifically, the width of the back main grid line is larger than that of the front main grid line.

Specifically, the width of the back laser scribing area is 0.3-3 mm.

The manufacturing method of the half laminated tile assembly is characterized by comprising the following steps:

A) preparing a certain number of battery pieces;

B) cutting along the back laser scribing area by using laser scribing equipment to prepare half-laminated tile battery piece fragments;

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

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 two battery piece division pieces by a mechanical piece breaking tool;

preferably, the number of laser cutting is 1 or more;

C) preparing a tin-plated copper welding strip, stamping a welding strip stamping area in the middle of the welding strip by a tool after the welding strip is straightened, stamping and thinning the welding strip stamping area to a specific thickness from a certain thickness, simultaneously shaping a welding strip deformation buffer area into an arc or an S shape by the tool, then welding the tin-plated copper welding strip to main grid lines on the front and back sides of a battery piece by battery piece welding equipment, welding the grid lines on the front side of the welding strip at the grid lines on the front side of the battery piece, wherein the welding strip stamping area is an overlapped part of adjacent battery pieces, and the welding strip deformation buffer area and the welding strip back main grid line welding area are laid on the back side of the adjacent battery piece, wherein the welding strip deformation buffer area is not contacted with the main grid lines on the back side, and the welding strip back main grid line welding area is contacted with the;

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 of the tinned copper welding strip is increased, the total cross-sectional area is basically unchanged, and in order to improve the mechanical load performance of the half laminated tile assembly, the punched area of the tinned copper welding strip 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 tin-plated copper welding strip is a non-welding area, the stamping area is in contact with an overlapping area of adjacent battery piece sub-pieces, the stamping length of the stamping area needs to be ensured to be larger than the width of the overlapping area of the adjacent battery piece sub-pieces, a deformation buffer area of the tin-plated copper welding strip is distributed on the back surface of the battery piece and is not in contact with a main grid on the back surface, so that the stamping area is the non-welding area, a grid line welding area on the front surface of the tin-plated copper welding strip is in contact with and welded with a main grid line on the front surface of the battery piece, a main grid line welding area on the back surface of the tin-plated copper welding strip is in contact with;

furthermore, the stamping area of the welding strip 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) accurately overlapping the edges of two welded battery piece fragments by using a manipulator, wherein a welding strip extends from the front of each battery piece fragment to the back of each adjacent battery piece fragment, and the width of the overlapping area of the adjacent battery piece fragments is smaller than that of a welding strip stamping area;

specifically, the overlapping width of the edges of adjacent battery pieces is 0.2-2.0 mm;

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

specifically, the length of the deformation buffer area of the welding strip is 2-10 mm;

preferably, the welding strip deformation buffer area is changed into an arc or an S shape from a straight line after being shaped, and the thickness of the welding strip deformation buffer area is basically unchanged or slightly reduced;

E) repeating the step D) to finish the manufacture of the half-laminated tile battery string, overlapping and welding a certain number of battery slices into battery strings through welding belts, connecting different battery strings in series or in parallel by adopting bus bars, welding bypass diodes between adjacent bus bars to protect the battery slices, wherein 3 diode welding spot welding points a, b and c are provided, the anode leading-out wire of the assembly is at the welding point a, the cathode leading-out wire of the assembly is at the welding point c, the battery string a, the battery string b, the battery string c, the battery string D, the battery string e and the battery string f are connected in series to form the upper half part of the assembly in an equivalent circuit of the assembly, the anode leading-out wire, the cathode leading-out wire, the battery string g, the battery string h, the battery string i, the battery string j, the battery string k and the battery string l are connected in series to form the lower half part of the assembly, and the upper half part and the lower half part, three bypass diodes are adopted 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 the battery pieces of each string of battery strings is 6-14;

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

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

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 2-layer structure, and the packaging adhesive film 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 assembly, the half laminated tile battery assembly has the advantages that the welding strip deformation buffer area is obtained through welding strip shaping in the manufacturing process of the half laminated tile battery assembly, the welding fragment rate of the half laminated tile battery is reduced in the manufacturing process of the half laminated tile battery assembly, the heat stress resistance and the deformation resistance of the half laminated tile battery assembly are improved, meanwhile, the welding strips are used for replacing conductive adhesive in the electrical performance and mechanical performance connection of the battery piece and the battery piece overlapping area, and the reliability of the assembly is improved.

Drawings

Fig. 1 is a schematic diagram of a front screen of a battery piece in the invention.

Fig. 2 is a schematic diagram of a back screen of a battery piece in the invention.

FIG. 3 is a schematic view of the stamping and shaping of the solder strip of the present invention.

FIG. 4 is a schematic drawing of the weld ribbon stamping and shaping of diamond, rectangular, circular and oval punch shapes in the present invention.

Fig. 5 is a schematic illustration of the half shingled cell piece overlap in accordance with the present invention.

Fig. 6 is an enlarged schematic view of the overlapping region of fig. 5 in the S-shape and concave shape.

Fig. 7 is a schematic view of the front overlapping of half shingled cells in accordance with the present invention.

Fig. 8 is a schematic diagram of back-side stacking of half-stacked shingle battery pieces in accordance with the present invention.

Fig. 9 is a schematic view of a half shingle assembly in accordance with the present invention.

FIG. 10 is a schematic circuit diagram of a half-laminated tile assembly of the present invention.

List of reference numerals:

100-front side major grid line, 101-front side minor grid line, 102-front side scribe area, 103-back side major grid line, 104-back side aluminum back field, 105-back side scribe area, 106-solder tape front side grid line pad area, 107-solder tape punch area, 108-solder tape deformation buffer area, 109-solder tape back side major grid line pad area, 206-overlap area, 207-solder tape, 210-bus bar, 211-solder point a, 212-solder point b, 213-solder point c, 214-positive lead out, 215-bypass diode, 216-negative lead out, 2141-cell string a, 2142-cell string b, 2143-cell string c, 2144-cell string d, 2145-cell string e, 2146-cell string f, 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: and manufacturing a half laminated tile battery piece.

As shown in fig. 1, a half tile-stacked battery piece front screen printing plate comprises a front main grid line 100, a front fine grid line 101 and a middle laser scribing region 102, wherein the front main grid line 100 and a front secondary grid line 101 are perpendicular to each other and intersect, the head and tail ends of the front main grid line 100 are of a bifurcated structure, the front main grid line 100 and the secondary grid line 101 comprise two parts which are vertically and centrosymmetrically, the middle region of the upper part and the lower part is a front laser scribing region 102, the parts are not connected by 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 battery piece is divided into an upper part and a lower part, and the upper part is rotated by 180 degrees to. 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 45um, and the width of the laser scribing area 102 is 2 mm.

As shown in fig. 2, the back major gate lines 103 of the cell are opposite to the front major gate lines 100, and each back major gate line is 4 segments, wherein the length of 2 segments close to the laser scribing street 105 is smaller than the other 2 segments, the back of the cell is divided into an upper part and a lower part, the upper part is rotated 180 degrees to form a lower part, the width of the back laser scribing region 105 is 2mm, and no aluminum back field is covered.

And laser scribing equipment is adopted to perform laser cutting along the back laser scribing area 105 in the middle, the laser power is 50W, the wavelength is 1024nm, and the laser cutting action is corresponding to the front laser scribing area 102 on the back surface of the cell piece during laser cutting. 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 method of half laminated tile assembly

The manufacturing method of the half laminated tile assembly comprises the following steps:

A) preparing 66 half-tile-stacked 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 1;

B) cutting along the laser scribing area by using laser scribing equipment to prepare half-laminated tile battery piece fragments; the laser acts on the back surface of the cell piece to avoid damaging PN junctions on the front surface, 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 piece cut by the laser is cut into 2 cell piece fragments by a mechanical sheet breaking tool, and the half parts of the cell piece fragments are rotated by 180 degrees, so that 132 half laminated tile cell piece fragments can be obtained;

C) preparing a tinned copper welding strip, stamping a welding strip stamping area 107 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 107 to a specific thickness from a certain thickness, processing a welding strip deformation buffer area 108 into an arc shape or an S shape by using a shaping tool, and then welding the tinned copper welding strip to the main grid lines on the front side and the back side of a battery piece by using battery piece welding equipment; the cross section of the tin-plated copper welding 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; the solder ribbon buffer 108 is 4mm in length. As shown in fig. 7, the length of the welding strip is 135mm, wherein about 70.5mm is laid on the main grid line on the front side of the cell slice in the middle, the remaining 64.5mm is laid on the main grid line on the back side of the adjacent cell slice, the welding strip is welded on the main grid line on the front side and the back side of the cell slice by adopting an infrared heating mode, the welding temperature is 240 ℃, the welding time is 1.5s, and the welding point of the welding strip on the front side of the cell slice is close to the laser scribing channel;

D) the edges of two welded battery pieces are accurately overlapped together by using a manipulator, as shown in fig. 7, a welding strip extends from the front of each battery piece to the back of each adjacent battery piece, the overlapping between the adjacent battery pieces is rectangular, the overlapping width of the edges of the adjacent battery pieces is 1.5mm, the overlapping precision of the edges of the adjacent battery pieces is +/-100 microns, and a welding strip buffer area is positioned on the back of each battery piece;

E) and D) repeating the step D) to finish manufacturing of the half-laminated tile battery string, arranging 12 strings of batteries according to the distribution shown in figure 9, laminating and welding 11 battery slices into the battery string through welding bands, arranging the battery string into a component according to the distribution shown in figure 9, connecting different battery strings in series or in parallel through bus bars 210, welding bypass diodes between adjacent bus bars to protect the battery slices, and totally 3 diode welding spot welding joints a211, a welding joint b212 and a welding joint c213 are arranged, wherein the anode leading-out wire of the component is at the welding joint a211, and the cathode leading-out wire of the component is at the welding joint c 213. The equivalent circuit of the assembly is shown in fig. 10, 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 assembly, a positive electrode outgoing line 214, a negative electrode outgoing line 216, 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 assembly, the upper half part and the lower half part of the assembly are connected in parallel to form the lower half part of the assembly, and 3 bypass diodes 215 are adopted to protect the battery piece. The number of the battery piece slices of the battery string 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.

The invention has the beneficial effects that: compared with the conventional half/laminated tile battery assembly, the half laminated tile battery assembly has the advantages that the welding strip deformation buffer area is obtained through welding strip shaping in the manufacturing process of the half laminated tile battery assembly, the welding fragment rate of the half laminated tile battery is reduced in the manufacturing process of the half laminated tile battery assembly, the heat stress resistance and the deformation resistance of the half laminated tile battery assembly are improved, meanwhile, the welding strips are used for replacing conductive adhesive in the electrical performance and mechanical performance connection of the battery piece and the battery piece overlapping area, and the reliability of the assembly is improved.

Claims

1. A half-laminated tile assembly, comprising: the welding strip is formed by welding battery piece fragments and welding strips, the battery piece fragments are half structures of the battery piece, the positive electrode of each battery piece fragment is connected with the negative electrode of each adjacent battery piece fragment through the welding strips, the edges of the two adjacent battery piece fragments are overlapped, the edge of one battery piece fragment is arranged at the edge of the back face of each adjacent battery piece fragment, and the welding strips distributed at the back face of each battery piece fragment and close to the overlapped part are arc-shaped or S-shaped.

2. A half shingle assembly in accordance with claim 1 wherein: the front electrode of the cell slice comprises an upper part and a lower part which are in central symmetry with respect to the center of the cell slice, and the area between the upper part and the lower part of the front surface of the cell slice is a front surface laser scribing area; the back electrode of the cell piece comprises an upper part and a lower part which are in central symmetry with respect to the center of the cell piece, and the region between the upper part and the lower part of the back of the cell piece is a back laser scribing region.

3. A half shingle assembly in accordance with claim 2 wherein: the width of the front laser scribing area is more than or equal to 0.3 mm.

4. A half shingle assembly in accordance with claim 2 wherein: the upper part and the lower part of the front of the battery piece are respectively provided with a front main grid line and a front auxiliary grid line, the front main grid line and the front auxiliary grid line are mutually vertical and intersected, the head end and the tail end of the front main grid line are of a bifurcated structure, the width of the bifurcated structure close to a front laser scribing area is consistent with that of the front main grid line, the width of the bifurcated structure at the other end is larger than that of the front main grid line, and the upper part of the front of the battery piece and the front main grid line of the lower part are mutually parallel and staggered; the upper part and the lower part of the back surface of the cell piece are respectively provided with a back main grid line and a back aluminum back field, the back main grid line corresponds to the front main grid line in position, the back main grid lines of the upper part and the lower part of the back surface of the cell piece are respectively divided into two sections, and the length of the section close to the middle back laser scribing area is smaller than the length of the section far away from the back laser scribing area.

5. A half shingle assembly in accordance with claim 4 wherein: the front side laser scribing region is provided with front side auxiliary grid lines, and the back side laser scribing region is not provided with a back side aluminum back field and a back side main grid line.

6. A half shingle assembly in accordance with claim 1 wherein: the welding strip is a tinned copper welding strip with a rectangular or circular cross section.

7. A half shingle assembly in accordance with claim 1 wherein: the thickness of the welding strip at the overlapping part of the battery piece segments is 0.07-0.15 mm.