CN214625055U - MWT hexagonal battery electrode structure suitable for half-and-half slicing - Google Patents
MWT hexagonal battery electrode structure suitable for half-and-half slicing Download PDFInfo
- Publication number
- CN214625055U CN214625055U CN202022757288.0U CN202022757288U CN214625055U CN 214625055 U CN214625055 U CN 214625055U CN 202022757288 U CN202022757288 U CN 202022757288U CN 214625055 U CN214625055 U CN 214625055U
- Authority
- CN
- China
- Prior art keywords
- hexagonal
- grid lines
- point
- electrode
- mwt
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Battery Electrode And Active Subsutance (AREA)
Abstract
The utility model discloses a be suitable for half-and-half sliced MWT hexagon battery electrode structure, the electrode point distributes on the hexagon battery piece, wherein, use a diagonal of hexagon battery piece as the symmetry axis, divide into the form of both sides perfect symmetry about the hexagon battery piece, the negative pole point uses this diagonal as the symmetry axis symmetric distribution, the negative pole point that is located the most marginal distributes with the marginal equidistance of battery piece, and be equilateral triangle distribution between each negative pole point; the positive pole point is positioned at the center of the equilateral triangle negative pole points, and every three equilateral triangle negative pole points and one central positive pole point form the minimum repeating unit of the MWT hexagonal battery back electrode; the minimum electrode repeating units are uniformly distributed on the hexagonal silicon wafer at equal intervals, and the number of the cathode points is determined according to the cathode point spacing and the size of the silicon wafer. The utility model provides a structure, the battery piece that cuts hole or electrode point and cause is hidden to split or the piece when having avoided central section, is favorable to reducing section piece rate, improves the subassembly yield.
Description
Technical Field
The application relates to the technical field of photovoltaic cell assemblies, in particular to an MWT hexagonal cell electrode structure suitable for half-and-half slicing.
Background
MWT is a metal perforation winding technology, is applied to a solar cell, realizes a perforation process on a primary silicon wafer through laser or other methods, achieves the purpose of leading positive and negative electrodes to the same surface, and is specially designed without a main grid to reduce the shading area and increase the conversion efficiency of the cell; at present, the cost is reduced by various methods in the photovoltaic industry, the utilization rate of a silicon rod can be improved by 12% by a hexagonal slicing mode for the same crystal bar section, the area of a battery piece can be improved, and further the efficiency and the assembly power are improved. And the requirement of building industry and the like on the attractive appearance of the assembly is higher, and the assembly has market prospect in Europe and America. The CN 201663166U mentions that the typesetting mode of the assembly is that the inside of the assembly is distributed by using a complete hexagonal cell, and the edge of the assembly is cut into half pieces by using a residual piece to typeset, thereby improving the effective area of the assembly. This method increases the effective area of the device according to P ═ I2R, the power dissipated inside the component is proportional to the square of the current. The large-area hexagonal battery piece is large in area and current loss, hot spot effect is easy to occur, and service life of the assembly is not facilitated. CN 209169159U mentions that the hexagonal cell half pieces are used for typesetting, so that the effective area of the module is increased, the current loss of the module is reduced, and the hot spot risk is reduced.
The half-piece assembly needs to use a hexagonal battery piece to slice half and half, the existing regular hexagonal battery design is not beneficial to slicing half and half due to the distribution of a negative pole point and a positive pole point formed by a through hole, and the design of the negative pole hole and the positive pole point needs to avoid the center line of a hexagonal diagonal.
SUMMERY OF THE UTILITY MODEL
The utility model provides a to above-mentioned prior art not enough, the utility model provides a be applicable to half sliced hexagon MWT battery just, the design of negative pole point, the battery piece that cuts hole or electrode point and cause is hidden to split or the piece when this design is avoided central section, is favorable to reducing section piece rate, improves the subassembly yield.
The utility model relates to a be suitable for half MWT hexagon battery electrode structure of section, the electrode distributes on hexagon battery piece with the electrode point form, wherein, regard as a diagonal of hexagon battery piece as the symmetry axis, divide into the form that the both sides are complete symmetry about hexagon battery piece, and the negative pole point uses this diagonal as symmetry axis symmetric distribution, and the negative pole point that lies in the most marginal distributes with the marginal equidistance of battery piece, and is equilateral triangle between each negative pole point and distributes;
the positive pole point is positioned at the center of the equilateral triangle negative pole points, and every three equilateral triangle negative pole points and one central positive pole point form the minimum repeating unit of the MWT hexagonal battery back electrode;
the minimum electrode repeating units are uniformly distributed on the hexagonal silicon wafer at equal intervals, 4 rows or 3 rows or 2 rows of negative electrode points are distributed on each half of the silicon wafer, and the number of the negative electrode points is determined according to the distance between the negative electrode points and the size of the silicon wafer.
Furthermore, the grid lines on the front surface of the hexagonal battery piece are composed of N grid line minimum repeating units, N is an integer, the external shape of the grid line minimum repeating unit is hexagonal and comprises six main grid lines and a plurality of thin grid lines, wherein the main grid lines are positioned on the middle lines of the hexagonal edges, the intersection points of every two main grid lines extend outwards to form middle thin grid lines, the thin grid lines are symmetrically distributed on the left side and the right side of the middle thin grid lines, the middle thin grid lines are used as symmetry axes, the distance between every two adjacent thin grid lines is gradually increased from the middle thin grid lines to the two sides.
As a preferred embodiment of the present application, there are 1 middle thin gate line and two side thin gate lines between every two main gate lines in the minimum repeating unit of gate lines, and the distance between two adjacent thin gate lines is 1.1mm, 1.2mm, 1.26mm, and 1.31mm from the middle thin gate line to the two sides respectively;
the lengths of the thin gate lines and the main gate lines are based on the external shape of the thin gate lines and the main gate lines being hexagonal.
Furthermore, the central position of the minimum repeating unit of the grid lines is a negative electrode point, and the current collected by the grid lines is guided to the negative electrode point on the back surface through the central negative electrode hole.
Furthermore, the minimum repeating unit of the grid line is distributed at the edge position of the battery piece, and the shape of the minimum repeating unit of the grid line is adjusted adaptively according to the shape of the edge of the battery piece.
Preferably, the aperture of the negative electrode point is 0.3-1.0 mm.
Compared with the prior art, the utility model relates to a be suitable for half sliced MWT hexagon battery electrode structure has following beneficial effect:
the utility model provides a design suitable for half sliced hexagonal MWT battery is just, negative pole point, negative pole hole interval is equilateral triangle, and the positive pole point is located the center of equilateral triangle negative pole hole, and positive negative pole point distributes with diagonal line symmetric distribution, and this design is cut the hidden splitting of battery piece or the piece that hole or electrode point caused when avoiding central section, is favorable to reducing the piece rate of cutting into slices, improves the subassembly yield. The fine grid line spacing of the front grid line is gradually changed, the fine grid line spacing is in negative correlation with the grid line length, the main grid width is gradually changed in a segmented mode, the uniformity of front current collection and conduction is greatly improved, and efficiency is improved.
Drawings
In order to more clearly illustrate the technical solution of the present invention, the drawings required for the use of the present invention will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without inventive work.
FIG. 1 is a back positive and negative electrode point position distribution diagram of the MWT hexagonal cell sheet of the present invention;
fig. 2 is a schematic diagram of front grid lines of an MWT hexagonal cell of the present invention;
FIG. 3 is an enlarged view of the minimum repeating unit of the grid lines on the front surface of the MWT hexagonal cell;
wherein 1 is a middle thin grid line, 2-5 are thin grid lines on the second to fifth sides, 6 is a main grid line, fig. 3 is a minimum repeating unit of the grid line, a is a negative electrode point, b is an anode point, c is a negative electrode point interval, d is an anode and cathode point interval
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
The utility model relates to a be suitable for half MWT hexagon battery electrode structure of section, the electrode distributes on hexagon battery piece with the electrode point form, wherein, regard as a diagonal of hexagon battery piece as the symmetry axis, divide into the form that the both sides are complete symmetry about hexagon battery piece, and the negative pole point uses this diagonal as symmetry axis symmetric distribution, and the negative pole point that lies in the most marginal distributes with the marginal equidistance of battery piece, and is equilateral triangle between each negative pole point and distributes;
the positive pole point is positioned at the center of the equilateral triangle negative pole points, and every three equilateral triangle negative pole points and one central positive pole point form the minimum repeating unit of the MWT hexagonal battery back electrode;
the minimum electrode repeating units are uniformly distributed on the hexagonal silicon wafer at equal intervals, 4 rows or 3 rows or 2 rows of negative electrode points are distributed on each half of the silicon wafer, and the number of the negative electrode points is determined according to the distance between the negative electrode points and the size of the silicon wafer.
Furthermore, the grid lines on the front surface of the hexagonal battery piece are composed of N grid line minimum repeating units, N is an integer, the external shape of the grid line minimum repeating unit is hexagonal and comprises six main grid lines and a plurality of thin grid lines, wherein the main grid lines are positioned on the middle lines of the hexagonal edges, the intersection points of every two main grid lines extend outwards to form middle thin grid lines, the thin grid lines are symmetrically distributed on the left side and the right side of the middle thin grid lines, the middle thin grid lines are used as symmetry axes, the distance between every two adjacent thin grid lines is gradually increased from the middle thin grid lines to the two sides.
The structure is further described by taking two types of hexagonal cell pieces as examples, and the preparation process of the cell piece is as follows:
example 1
1. Hexagonal silicon wafers with a side length of 105mm were used: the battery piece is manufactured according to the normal process flow of the MWT battery
Laser drilling → texturing → diffusion → PSG + alkali polishing → annealing → back passivation (Al2O3+ SiNx) → front surface coating → laser grooving → screen printing
2. Printing front and back electrode patterns
2.1 laser drilling 44 lattice holes vertically penetrating through the cell piece are used as negative pole holes, the hole positions can be symmetrically distributed according to a hexagonal diagonal center line, the distance between negative pole points is 26.2498mm, positive pole points are positioned at the center of the negative pole points in an equilateral triangle, the number of the positive pole points is 30, and as shown in fig. 1, the back surface is printed with a corresponding aluminum back surface field.
2.2 the front electrode current lead-out points correspond to the positions of the laser drilling holes one by one; the front electrode secondary grid line pattern is an annular array hexagonal pattern formed by 6 straight lines around an electrode point by taking a circular electrode point with the diameter of 0.5mm as the center, a minimum grid line repeating unit is formed by six main grid lines 6 and a plurality of thin grid lines, the spacing between 1-5 grid lines is a gradually-changed spacing which is 1.1mm, 1.2mm, 1.26mm and 1.31mm respectively, the length of the grid lines is reduced from large to small, and the spacing between the lines is increased from small to large; the main grid line is divided into 6 sections, and the line width gradually decreases from the cathode hole to the outside in sequence.
Example 2:
1. using a hexagonal silicon wafer with the side length of 84mm, and manufacturing a battery piece according to the normal process flow of the MWT battery:
laser drilling → texturing → diffusion → PSG + alkali polishing → annealing → back passivation (Al2O3+ SiNx) → front surface coating → laser grooving → screen printing.
2. Printing front and back electrode patterns
2.1 laser drilling has 30 dot matrix holes that run through the battery piece perpendicularly as the negative pole hole, and the hole position can be according to hexagon diagonal central line symmetric distribution, and negative pole point interval is 26mm, and the positive pole point is located the center that is equilateral triangle's negative pole point, and the number of positive pole point is 24, and the back printing corresponds the aluminium back field.
2.2 the front electrode current lead-out points correspond to the positions of the laser drilling holes one by one; the front electrode secondary grid line pattern is an annular array hexagonal pattern formed by 6 straight lines around an electrode point by taking a circular electrode point with the diameter of 0.5mm as the center, a minimum grid line repeating unit is formed by six main grid lines 6 and a plurality of thin grid lines, the spacing between 1-5 grid lines is a gradually-changed spacing which is 1.1mm, 1.2mm, 1.3mm and 1.4mm respectively, the length of the grid lines is reduced from large to small, and the spacing between the lines is increased from small to large; the main grid line is divided into 6 sections, and the line width gradually decreases from the cathode hole to the outside in sequence.
The above description is only exemplary of the present application and should not be taken as limiting the present application, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present application should be included in the protection scope of the present application.
Claims (5)
1. An MWT hexagonal battery electrode structure suitable for half-and-half slicing is characterized in that electrode points are distributed on a hexagonal battery piece, wherein a diagonal line of the hexagonal battery piece is taken as a symmetry axis, the hexagonal battery piece is divided into a form that the left side and the right side are completely symmetrical, negative electrode points are symmetrically distributed by taking the diagonal line as the symmetry axis, the negative electrode points positioned at the most edge are equidistantly distributed with the edge of the battery piece, and the negative electrode points are distributed in an equilateral triangle;
the positive pole point is positioned at the center of the equilateral triangle negative pole points, and every three equilateral triangle negative pole points and one central positive pole point form the minimum repeating unit of the MWT hexagonal battery back electrode;
the minimum electrode repeating units are uniformly distributed on the hexagonal silicon wafer at equal intervals, 4 rows or 3 rows or 2 rows of negative electrode points are distributed on each half of the silicon wafer, and the number of the negative electrode points is determined according to the distance between the negative electrode points and the size of the silicon wafer.
2. The electrode structure of the MWT hexagonal battery suitable for half-and-half slicing according to claim 1, wherein the grid lines on the front surface of the hexagonal battery slice are composed of N grid line minimum repeating units, N is an integer, the grid line minimum repeating units are hexagonal in external shape and comprise six main grid lines and a plurality of thin grid lines, wherein the main grid lines are located on the middle line of the hexagonal side, the intersection point of every two main grid lines extends outwards to form a middle thin grid line, the thin grid lines are symmetrically distributed on the left side and the right side of the middle thin grid line, and the middle thin grid line is used as a symmetry axis, and the distance between two adjacent thin grid lines is gradually increased from the middle thin grid line to the two sides.
3. The electrode structure of MWT hexagonal cell suitable for half-and-half slicing, according to claim 2, wherein there are 1 middle thin grid line and two side thin grid lines between every two main grid lines in the minimum repeating unit of grid lines, and the distance between two adjacent thin grid lines is 1.1mm, 1.2mm, 1.26mm, 1.31mm from the middle thin grid line to the two sides respectively.
4. The electrode structure of MWT hexagonal cell suitable for half-slicing as claimed in claim 3, wherein the central position of the minimum repeating unit of grid lines is a negative electrode point, and the current collected by the grid lines is conducted to the negative electrode point through the central negative electrode hole.
5. The electrode structure of the MWT hexagonal battery suitable for half-slicing according to claim 4, wherein the aperture of the negative electrode point is 0.3-1.0 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022757288.0U CN214625055U (en) | 2020-11-25 | 2020-11-25 | MWT hexagonal battery electrode structure suitable for half-and-half slicing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022757288.0U CN214625055U (en) | 2020-11-25 | 2020-11-25 | MWT hexagonal battery electrode structure suitable for half-and-half slicing |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214625055U true CN214625055U (en) | 2021-11-05 |
Family
ID=78427751
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022757288.0U Active CN214625055U (en) | 2020-11-25 | 2020-11-25 | MWT hexagonal battery electrode structure suitable for half-and-half slicing |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN214625055U (en) |
-
2020
- 2020-11-25 CN CN202022757288.0U patent/CN214625055U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US7714224B2 (en) | Photovoltaic power generation module and photovoltaic power generation system employing same | |
| CN110085703B (en) | Slicing method and splicing method of regular-hexagon solar cell | |
| WO2017128658A1 (en) | Crystalline silicon solar cell | |
| CN110212056A (en) | It is sliced the preparation method of solar battery sheet | |
| WO2017128667A1 (en) | Front electrode of crystalline silicon solar cell | |
| CN201436683U (en) | Electrode structure of solar energy cell | |
| WO2017128669A1 (en) | Crystalline silicon solar cell | |
| CN214625055U (en) | MWT hexagonal battery electrode structure suitable for half-and-half slicing | |
| CN103151426B (en) | A kind of solar cell cutting technique ensureing solar cell electrical property | |
| WO2017128665A1 (en) | Crystalline silicon solar cell | |
| EP3940795A1 (en) | Solar cell sheet, solar cell panel and screen printing plate | |
| JP3687970B1 (en) | Solar power generation module and solar power generation system using the same | |
| CN101853886A (en) | Electrode pattern of solar cell | |
| CN212934623U (en) | MWT solar cell back panel with square-shaped main grid auxiliary line | |
| US20130291924A1 (en) | Photovoltaic device, manufacturing method thereof, and photovoltaic module | |
| CN216871987U (en) | Solar cell | |
| CN203250753U (en) | Solar battery sheet front-surface positive electrode | |
| CN216624295U (en) | Photovoltaic module | |
| CN212277204U (en) | Crystalline silicon solar cell slice and photovoltaic module formed by same | |
| CN220198809U (en) | Battery back graphic screen suitable for laser cutting | |
| CN111653634A (en) | MWT solar cell back panel with square-shaped main grid auxiliary line | |
| CN210390448U (en) | Grid line screen printing plate for front electrode of crystalline silicon solar cell | |
| CN209544365U (en) | Regular hexagon MWT solar battery sheet | |
| CN115548137A (en) | Solar cell, tile-overlapping assembly and printing screen | |
| CN109037375B (en) | Solar cell and solar cell module |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |