CN118507554A - Main-grid-free heterojunction battery, preparation method thereof and battery assembly - Google Patents
Main-grid-free heterojunction battery, preparation method thereof and battery assembly Download PDFInfo
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- CN118507554A CN118507554A CN202410955375.7A CN202410955375A CN118507554A CN 118507554 A CN118507554 A CN 118507554A CN 202410955375 A CN202410955375 A CN 202410955375A CN 118507554 A CN118507554 A CN 118507554A
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- 238000002360 preparation method Methods 0.000 title abstract description 9
- 238000000034 method Methods 0.000 claims abstract description 18
- 238000009413 insulation Methods 0.000 claims description 25
- 238000003466 welding Methods 0.000 claims description 25
- 239000002390 adhesive tape Substances 0.000 claims description 13
- 238000007639 printing Methods 0.000 claims description 8
- 238000000926 separation method Methods 0.000 claims description 4
- 238000005245 sintering Methods 0.000 claims description 4
- 239000000853 adhesive Substances 0.000 claims description 3
- 230000001070 adhesive effect Effects 0.000 claims description 3
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 8
- 230000000052 comparative effect Effects 0.000 description 8
- 229910052709 silver Inorganic materials 0.000 description 8
- 239000004332 silver Substances 0.000 description 8
- 238000013461 design Methods 0.000 description 7
- 238000005516 engineering process Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 239000003292 glue Substances 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 3
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- 238000005520 cutting process Methods 0.000 description 2
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- 238000010438 heat treatment Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
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- 239000003086 colorant Substances 0.000 description 1
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- 230000002860 competitive effect Effects 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000003475 lamination Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
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- 239000002344 surface layer Substances 0.000 description 1
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Abstract
The invention provides a heterojunction battery without a main grid, a preparation method thereof and a battery assembly, comprising a heterojunction battery piece, a plurality of thin grid lines arranged on two sides of the heterojunction battery piece and two thick grid lines arranged on two sides of the heterojunction battery piece; the fine grid lines form a grid structure; the two thick grid lines are symmetrically arranged in the center of the heterojunction battery piece and are respectively connected with the thin grid lines on the corresponding surface; and connecting the non-main-grid heterojunction batteries in series to obtain a battery assembly, wherein adjacent non-main-grid heterojunction batteries are fixedly attached back to back along the edge of one side provided with the thick grid lines, and the adjacent thick grid lines are electrically connected with each other. According to the non-main-grid heterojunction battery, on the premise of reducing the cost and avoiding short circuit of battery pieces, the power is improved, the battery assembly is arranged in a gapless mode, the process flow is greatly simplified, the utilization rate of unit area is improved, and the total power is improved.
Description
Technical Field
The invention relates to the technical field of solar cell modules, in particular to a heterojunction cell without a main gate, a preparation method of the heterojunction cell and a cell module.
Background
The current photovoltaic industry is increasingly competitive, photovoltaic products begin to pursue extremely low cost and high efficiency, and in terms of reducing battery cost, the development of a no-main-grid technology in recent years is expected. The main characteristic of the technology without main grid is that the main grid which is needed to be printed on the surface of the battery is deleted, only the design of the auxiliary grid is reserved, the original main grid is used for collecting the current of the auxiliary grid, and the technology without main grid is replaced by a welding belt; because the silver consumption of the main grid is larger, the consumption of silver paste printed by the battery is reduced by about half after the non-main grid technology is adopted, and the cost of the silver paste occupies about 40% of the manufacturing cost of the whole battery, so that the non-main grid technology can realize a considerable cost reduction effect.
The main grid-free technology brings considerable benefits for reducing the cost of battery products, and also requires the supporting process and equipment support of a downstream component end. At present, the welding process of the battery piece component without the main grid mainly adopts a positioning and glue brushing mode, and is assisted with low-temperature heating to fix the welding strip on the surface layer of the battery piece, so that the welding strip can better play the role of replacing the main grid, the diameter of the welding strip needs to be further reduced, the number of the welding strips on the surface of the battery needs to be further improved, and the overall process difficulty is greatly increased: firstly, a dispensing machine is required to be additionally arranged and is responsible for positioning point glue on the surface of a battery piece, and meanwhile, small glue marks are required to be ensured, and the bonding is firm and meets the requirement of tension; secondly, after the diameter of the welding strips is reduced, the current collection effect is improved by increasing the number of the welding strips, and if welding problems occur, the reworking difficulty is huge; finally, after the diameter of the welding strip is reduced, the welding strip is very soft compared with the original welding strip, and in the high-temperature lamination process, the welding strip is easily pulled out by the extrusion of liquid glue, so that the appearance problem of the battery assembly is caused.
Disclosure of Invention
The invention aims to: the invention aims to provide a main gate-free heterojunction battery capable of reducing cost and effectively preventing battery short circuit, a preparation method thereof and a battery assembly.
The technical scheme is as follows: a heterojunction battery without a main grid comprises a heterojunction battery piece, a plurality of thin grid lines arranged on the front side and the back side of the heterojunction battery piece, a first thick grid line arranged on the front side of the heterojunction battery piece and a second thick grid line arranged on the back side of the heterojunction battery piece; the thin grid lines comprise a plurality of first thin grid lines which are parallel to each other and a plurality of second thin grid lines which are parallel to each other, the first thin grid lines and the second thin grid lines are not parallel to each other, each second thin grid line is at least connected with two first thin grid lines, and at least one second thin grid line is connected between two adjacent first thin grid lines; the first thick grid line and the second thick grid line are arranged in a central symmetry mode through the heterojunction cell, the first thick grid line is connected with a plurality of thin grid lines on the front face of the heterojunction cell, the second thick grid line is connected with a plurality of thin grid lines on the back face of the heterojunction cell, and the heterojunction cell is provided with the first thick grid line and the second thick grid line, and insulation grooves parallel to the edges are respectively formed in the edges of the two sides of the first thick grid line and the second thick grid line.
Preferably, the first thin grid lines and the second thin grid lines are connected in a crossing manner to form a grid structure.
Preferably, the first thin gate line and the second thin gate line are perpendicular to each other.
The invention also provides a preparation method of the heterojunction battery without the main gate, which comprises the following steps:
(1) Printing a grid line circuit on the front surface of the heterojunction cell by utilizing a special screen;
(2) Curing by using a high-temperature curing furnace;
(3) Printing a grid line circuit on the back of the heterojunction battery piece by utilizing the special screen;
(4) Sintering the heterojunction battery piece at a high temperature;
(5) And (3) utilizing ultraviolet laser, and forming an insulation groove at the edge of the heterojunction cell provided with the thick grid line to obtain the heterojunction cell without the main grid.
Specifically, the depth of the insulation groove is 50-100nm, and the width is 40-80 mu m; and two ends of the insulating groove are aligned with two ends of the thick grid line.
The invention also provides a battery assembly, which comprises at least two non-main-grid heterojunction batteries, wherein the adjacent non-main-grid heterojunction batteries are attached and fixed back to back along the edge of one side provided with a thick grid line; and the two non-main grid heterojunction batteries are electrically connected with each other through a thick grid line arranged on one attached side.
Preferably, the separation pulling force between two adjacent heterojunction cells without main gate is more than or equal to 20N.
Preferably, after the thick grid lines of the two non-main grid heterojunction batteries are attached, the thick grid lines are fixedly connected through a conductive adhesive tape.
Preferably, after the thick grid lines of the two non-main grid heterojunction batteries are attached, the thick grid lines are fixedly connected through welding strips.
Preferably, after the thick grid lines of the two non-main grid heterojunction batteries are attached, the thick grid lines are fixedly connected through conductive adhesive.
The beneficial effects are that: compared with the prior art, the invention has the remarkable effects that:
1. Compared with the traditional design that only one row of parallel auxiliary grids are printed on a non-main grid heterojunction battery, the invention provides two groups of thin grid lines which are mutually staggered and connected in two directions, and a pair of thick grid lines are symmetrically arranged at the centers of the edges of the front side and the back side of the battery and used for collecting the current of the thin grid lines.
2. The traditional heterojunction battery without the main grid usually reserves a blank area near the edge of the battery so as to prevent the communication of the front circuit and the back circuit from causing short circuit, but the invention adopts the design that the edge of the battery is provided with an insulating groove by laser, thereby ensuring that the front circuit and the back circuit of the battery piece are not communicated to cause short circuit.
3. In the traditional non-main-grid heterojunction battery packaging welding process, a section of welding belt is required to pass through a gap between two batteries to connect the anode and the cathode of the two batteries in series, the mode ensures that the gap exists between the battery pieces all the time, hidden cracks are easy to occur at the edges of the gap, and the invention adopts special insulation treatment at the edges of the batteries, the tight connection between the batteries can not have short circuits, and adopts a front-back alternating ordering mode of the two batteries, so that thick grid lines at two ends of the battery pieces can be tightly connected, and the two batteries can be simply and quickly connected by adopting a conductive adhesive tape, thereby greatly reducing equipment requirements, simplifying the series connection process of the battery assembly, and providing more process options.
Drawings
Fig. 1 is a schematic diagram of the front structure of a heterojunction cell without a main gate according to embodiment 1 of the present invention.
Fig. 2 is a schematic cross-sectional view of a non-main gate heterojunction cell according to embodiment 1 of the present invention.
Fig. 3 is a side view of a no-main gate heterojunction cell of embodiment 1 of the invention.
Fig. 4 is a schematic structural diagram of a heterojunction cell without a main gate according to embodiment 2 of the present invention.
Fig. 5 is a schematic structural diagram of a prior art non-main gate heterojunction cell provided by the present invention.
Fig. 6 is a schematic structural view of a battery pack according to embodiment 3 of the present invention.
Fig. 7 is a schematic view of the structure of a battery pack according to embodiment 4 of the present invention.
Fig. 8 is a schematic structural view of a battery pack according to the prior art provided by the present invention.
Reference numerals: 1. heterojunction cell sheets; 2. a first thin gate line; 3. a second thin gate line; 4. a first thick gate line; 5. a second thick gate line; 6. an insulation groove; 7. an auxiliary grid; 8. a conductive tape; 9. and (5) welding the tape.
Detailed Description
The invention is further elucidated below in connection with the drawings and the detailed description.
The invention provides a heterojunction battery without a main grid, which comprises a heterojunction battery piece, a plurality of thin grid lines arranged on the front side and the back side of the heterojunction battery piece, a first thick grid line arranged on the front side of the heterojunction battery piece and a second thick grid line arranged on the back side of the heterojunction battery piece; the thin grid lines comprise a plurality of first thin grid lines which are parallel to each other and a plurality of second thin grid lines which are parallel to each other, the first thin grid lines and the second thin grid lines are not parallel to each other, each second thin grid line is at least connected with two first thin grid lines, and at least one second thin grid line is connected between two adjacent first thin grid lines; the first thick grid line and the second thick grid line are arranged in a central symmetry mode through the heterojunction cell, the first thick grid line is connected with a plurality of thin grid lines on the front face of the heterojunction cell, the second thick grid line is connected with a plurality of thin grid lines on the back face of the heterojunction cell, and the heterojunction cell is provided with the first thick grid line and the second thick grid line, and insulation grooves parallel to the edges are respectively formed in the edges of the two sides of the first thick grid line and the second thick grid line.
The invention also provides a preparation scheme of the heterojunction battery without the main gate, which comprises the following steps:
(1) Printing a grid line circuit on the front surface of the heterojunction cell by utilizing a special screen plate corresponding to the design of the fine grid line and the coarse grid line;
(2) Curing the grid line circuit by using a high-temperature curing furnace;
(3) Printing a grid line circuit on the back of the heterojunction battery piece by utilizing the special screen;
(4) Sintering the heterojunction battery piece at a high temperature;
(5) And (3) utilizing ultraviolet laser, and forming an insulation groove at the edge of the heterojunction cell provided with the thick grid line to obtain the heterojunction cell without the main grid.
The depth of the insulation groove is 50-100nm, the width of the insulation groove is 40-80 mu m, two ends of the insulation groove are aligned with two ends of the thick grid line, and in the embodiment, the distance between the two ends of the heterojunction battery piece edge is about 2mm.
The invention also provides a battery assembly, which comprises at least two non-main-grid heterojunction batteries, wherein the adjacent non-main-grid heterojunction batteries are attached and fixed back to back along the edge of one side provided with a thick grid line; and the two non-main grid heterojunction batteries are electrically connected with each other through a thick grid line arranged on one attached side.
After the thick grid lines of the two non-main grid heterojunction batteries are attached, the thick grid lines can be fixed through conductive adhesive tapes, welding tapes, conductive adhesives and the like, and in the embodiment, the separation tensile force between the two adjacent non-main grid heterojunction batteries is more than or equal to 20N.
The technical scheme of the invention is further illustrated by the following in combination with specific examples and comparative examples.
In the following examples and comparative examples, heterojunction cell sheets with a length of 182mm, a width of 91mm and a thickness of 120 μm were used, and the adopted process flow and manufacturing parameters were the same unless otherwise specified.
Example 1
Referring to fig. 1 and 2, the present embodiment provides a non-main-grid heterojunction battery, which includes a heterojunction battery piece 1, a plurality of thin grid lines arranged on the front and back sides of the heterojunction battery piece 1, a first thick grid line 4 arranged on the front side of the heterojunction battery piece 1, and a second thick grid line 5 arranged on the back side of the heterojunction battery piece 1; in this embodiment, the thin grid lines include a plurality of first thin grid lines 2 parallel to each other and a plurality of second thin grid lines 3 parallel to each other, where the first thin grid lines 2 are perpendicular to the second thin grid lines 3, and all form an angle of 45 ° with the edge of the heterojunction cell 1, the distances between adjacent first thin grid lines 2 are d 1,1mm≤d1 and less than or equal to 3mm, and the distances between adjacent second thin grid lines 3 are d 2, and d 2=d1, that is, the first thin grid lines 2 and the second thin grid lines 3 are cross-connected with each other to form a square grid structure. The first thick grid line 4 is disposed at an edge of one side of the front surface of the heterojunction cell 1 and is connected to all thin grid lines of the front surface of the heterojunction cell 1, and the second thick grid line 5 is connected to all thin grid lines of the back surface of the heterojunction cell 1 based on the same arrangement mode, in this embodiment, the first and second thick grid lines are disposed on long sides of the heterojunction cell 1.
Referring to fig. 2, the first thick grid line 4 and the second thick grid line 5 are arranged in center symmetry with the heterojunction cell, and the two side edges of the heterojunction cell 1 provided with the thick grid line are respectively provided with an insulation groove 6 parallel to the edges.
Referring to fig. 3, the insulation grooves 6 are symmetrically formed at one side edge of the heterojunction cell 1, and two ends of the insulation groove 6 are aligned with two ends of the first thick gate line 4 and two ends of the second thick gate line 5 respectively, so as to ensure an insulation effect.
The preparation method of the heterojunction battery without the main gate comprises the following specific steps:
(1) Printing a grid line circuit on the front surface of the heterojunction battery piece by utilizing a special screen plate corresponding to the grid line design, and recording the front surface silver paste dosage as 22mg;
(2) Curing by a high-temperature curing furnace at 150-180 ℃ for 10-15s;
(3) Printing a grid line circuit on the back surface of the heterojunction battery piece by utilizing a special screen, and recording that the silver paste consumption of the back surface is 29mg;
(4) Sintering the heterojunction battery piece at a high temperature of 180-220 ℃ for 15-30s;
(5) Adopting 300-400nm ultraviolet laser, forming insulation grooves on two sides of the long edge of the heterojunction battery piece, wherein the depth of the insulation grooves is 50-100nm, the width is 55-65 mu m, and the length is 178-179mm;
(6) And (3) obtaining the heterojunction battery without the main gate through the steps (1) - (5), and testing the conversion efficiency of the battery to obtain the single-chip conversion efficiency with the average value of 25.5%.
Example 2
Referring to fig. 4, the present embodiment provides a heterojunction cell without main gate, which includes a heterojunction cell 1, a plurality of thin gate lines disposed on the front and back sides of the heterojunction cell 1, and a first thick gate line 4 and a second thick gate line 5 disposed on the front side of the heterojunction cell 1; in this embodiment, the thin grid lines include a plurality of first thin grid lines 2 parallel to each other and a plurality of second thin grid lines 3 parallel to each other, the pitches of the adjacent first thin grid lines 2 are the same, the second thin grid lines 3 may be further divided into 4 groups, each group is located on 1 straight line, the 4 straight lines are parallel to each other, in each group of the second thin grid lines 3, each second thin grid line 3 is staggered by a pair of first thin grid lines 2, each second thin grid line 3 is connected to two adjacent first thin grid lines 2, and two second thin grid lines 3 are disposed between two adjacent first thin grid lines 2; the first thick grid lines 4 are arranged at the edge of one side of the front surface of the heterojunction cell 1 and are connected with all the first thin grid lines 2 on the front surface of the heterojunction cell 1, and the second thick grid lines 5 are connected with all the second thin grid lines 3 on the back surface based on the same arrangement mode; in this embodiment, the first and second thick gate lines are disposed on the long side of the heterojunction cell 1.
Referring to fig. 2, based on the same arrangement as that of embodiment 1, the first thick grid line 4 and the second thick grid line 5 are arranged symmetrically with the center of the heterojunction cell, and the two side edges of the heterojunction cell 1 provided with the thick grid line are respectively provided with an insulation groove 6 parallel to the edges.
Referring to fig. 3, based on the same arrangement as that of embodiment 1, the insulation slots 6 are symmetrically formed at one side edge of the heterojunction cell 1, and two ends of the insulation slots 6 are aligned with two ends of the first coarse grid line 4 and two ends of the second coarse grid line 5 respectively, so as to ensure insulation effect.
The present embodiment provides a different design method of the gate line from embodiment 1, and can further reduce the amount of silver paste while realizing the same basic function.
Comparative example 1
Referring to fig. 5, the present comparative example provides a conventional heterojunction cell without main gate, which includes a heterojunction cell 1 and an auxiliary gate 7, wherein the auxiliary gate 7 is a plurality of parallel gate lines, the auxiliary gate 7 is spaced from the edge of the heterojunction cell 1 to avoid short circuit at the edge, and the edge of the heterojunction cell 1 is not provided with an insulation groove.
The parameters of the no-main-gate heterojunction cell of this comparative example versus the no-main-gate heterojunction cell provided in example 1 are shown in table 1 below:
TABLE 1
As can be seen from the data in table 1, compared with the conventional non-main-grid heterojunction battery, the non-main-grid heterojunction battery provided by the embodiment 1 of the invention reduces the usage amount of 25mg of silver paste per sheet on the basis of realizing the improvement of 0.1% conversion efficiency, and the cost of 0.1875 yuan can be saved and the cost of 0.0044 yuan/W can be reduced by calculating the price of the silver paste by 7500 yuan/kg for each printed sheet of non-main-grid heterojunction battery.
Example 3
Referring to fig. 6, the present embodiment provides a battery assembly, which includes a plurality of the non-main-gate heterojunction cells of embodiment 1, and the adjacent non-main-gate heterojunction cells are tightly attached and fixed back to back along the edge of one side provided with the thick gate lines, i.e. the first thick gate line 4 of one non-main-gate heterojunction cell is electrically connected with the second thick gate line 5 of the adjacent non-main-gate heterojunction cell.
In this embodiment, after the thick gate lines of the two non-main gate heterojunction cells are attached, the conductive adhesive tape 8 is fixedly connected, and the conductive adhesive tape 8 may be continuously or discontinuously arranged according to the requirement, but it is required to ensure that the separation tension between the two adjacent non-main gate heterojunction cells is greater than or equal to 20N, and in this embodiment, the width of the conductive adhesive tape 8 is greater than or equal to 4mm.
After the heterojunction battery without the main grid is fixedly connected, the heterojunction battery pieces 1 are directly and tightly connected without short circuit problem due to special insulation treatment of the edges of the heterojunction battery pieces 1 and the design of the insulation groove 6, and the front and back thick grid lines of the heterojunction battery pieces 1 are designed in a central symmetry way due to the fact that the colors of the front and back surfaces of the heterojunction battery pieces are highly similar, and therefore a front and back ordering mode is adopted, and the heterojunction battery without the main grid can be tightly attached to each other.
Taking 182/144 half-plate type components as examples, the preparation method of the battery component comprises the following steps:
(1) Sucking a single heterojunction battery without a main grid by a sucker, alternately paving 12pcs batteries according to the sequence of one front battery and one back battery, and tightly connecting the front and back thick grid lines of the adjacent batteries;
(2) Starting a transmission belt, and transmitting the laid battery strings to an adhesive tape attaching work area;
(3) Cutting transparent conductive adhesive tape with length of 178-180mm and width of more than or equal to 4mm by a mechanical arm, and attaching the adhesive tape above thick grid lines of adjacent batteries on the front side of the battery string;
(4) After the front adhesive tape is attached, the sucker group is uniformly adsorbed on the front surface of the battery string to drive the battery string to rotate reversely, so that the back surface of the battery string faces upwards;
(5) Cutting transparent conductive adhesive tape with length of 178-180mm and width of more than or equal to 4mm by a mechanical arm, and attaching the adhesive tape above thick grid lines of adjacent batteries on the back of the battery string;
(6) The manipulator turns over the battery string, and the battery string is put back to the platform, so that the tandem connection work of the heterojunction battery without the main grid is completed.
Example 4
Referring to fig. 7, the present embodiment provides a battery assembly, which includes a plurality of the non-main-gate heterojunction cells of embodiment 1, and the adjacent non-main-gate heterojunction cells are tightly attached and fixed back to back along the edge of one side provided with the thick gate lines, i.e. the first thick gate line 4 of one non-main-gate heterojunction cell is electrically connected with the second thick gate line 5 of the adjacent non-main-gate heterojunction cell.
In this embodiment, after the thick grid lines 4 of the two non-main-grid heterojunction cells are attached, the thick grid lines 4 are fixedly connected through the welding strips 9, and as the adjacent non-main-grid heterojunction cells are directly and tightly attached, only a small section of welding strip 9 is needed to fixedly connect the thick grid lines 4, so that the serial connection of the cell strings can be completed. In other contemplated embodiments, the conductive paste is heat cured as well as a bonding process for bonding the thick gate lines 4.
Comparative example 2
Referring to fig. 8, the present comparative example provides a conventional tandem connection cell assembly of non-main-grid heterojunction cells, which includes a plurality of non-main-grid heterojunction cells of comparative example 1 and a plurality of welding strips 9, wherein two non-main-grid heterojunction cells pass through the gap of the heterojunction cell sheet 1 through one section of welding strip 9 and are communicated with the positive and negative electrodes of the two non-main-grid heterojunction cells, and the welding manner is such that gaps are always present between the two non-main-grid heterojunction cells, and hidden cracks are easily generated at the edge portions of the gaps.
Taking 182/144 half-chip version as an example, the power test was performed on the module, and the battery module provided in example 3 was subjected to the power test under the same conditions, and the power data and process comparisons are shown in table 2 below:
TABLE 2
As can be seen from the comparison of the data and the process in table 2, the battery pack provided in the embodiment 3 has obvious advantages, no heating is needed in the process flow, the energy consumption is reduced, the process is simple, reworking is easy, the productivity can be obviously improved, and the efficiency attenuation of the battery piece of 0.5-0.7% can be effectively avoided; because the single heterojunction battery without the main grid is tightly attached without gaps, the problem of hidden cracking possibly caused by extrusion of the welding strip to the battery piece is avoided, the utilization rate of the unit area of the battery assembly is further improved, the single power is improved by 7W, and the performance improvement of 1.15% is realized.
Claims (10)
1. The heterojunction battery without the main grid is characterized by comprising a heterojunction battery piece, a plurality of thin grid lines arranged on the front side and the back side of the heterojunction battery piece, a first thick grid line arranged on the front side of the heterojunction battery piece and a second thick grid line arranged on the back side of the heterojunction battery piece; the thin grid lines comprise a plurality of first thin grid lines which are parallel to each other and a plurality of second thin grid lines which are parallel to each other, the first thin grid lines and the second thin grid lines are not parallel to each other, each second thin grid line is at least connected with two first thin grid lines, and at least one second thin grid line is connected between two adjacent first thin grid lines; the heterojunction battery piece is provided with a first thick grid line and a second thick grid line, wherein the first thick grid line and the second thick grid line are arranged in a central symmetry mode through a heterojunction battery piece, the first thick grid line is connected with a plurality of thin grid lines on the front face of the heterojunction battery piece, the second thick grid line is connected with a plurality of thin grid lines on the back face of the heterojunction battery piece, and insulating grooves parallel to the edges are respectively formed in the edges of two sides of the first thick grid line and the second thick grid line.
2. The non-main gate heterojunction cell of claim 1, wherein: the first thin grid lines are connected with the second thin grid lines in a crossing manner to form a grid-shaped structure.
3. The non-main gate heterojunction cell of claim 1, wherein: the first thin grid line and the second thin grid line are perpendicular to each other.
4. A method of preparing a no-main gate heterojunction cell as claimed in any one of claims 1 to 3, comprising the steps of:
(1) Printing a grid line circuit on the front surface of the heterojunction cell by utilizing a special screen;
(2) Curing by using a high-temperature curing furnace;
(3) Printing a grid line circuit on the back of the heterojunction battery piece by utilizing the special screen;
(4) Sintering the heterojunction battery piece at a high temperature;
(5) And (3) utilizing ultraviolet laser, and forming an insulation groove at the edge of the heterojunction cell provided with the thick grid line to obtain the heterojunction cell without the main grid.
5. The method for preparing the heterojunction cell without main gate according to claim 4, wherein the method comprises the following steps: the depth of the insulation groove is 50-100nm, and the width is 40-80 mu m; and two ends of the insulating groove are aligned with two ends of the thick grid line.
6. A battery assembly comprising at least two non-main-grid heterojunction cells according to claim 1, wherein adjacent non-main-grid heterojunction cells are attached and fixed back to back along the edge of one side provided with a thick grid line; and the thick grid lines arranged on the attached side of the adjacent non-main grid heterojunction batteries are electrically connected.
7. The battery assembly of claim 6, wherein: and the separation pulling force between two adjacent heterojunction batteries without main gate is more than or equal to 20N.
8. The battery assembly of claim 6, wherein: and after the thick grid lines of the two non-main grid heterojunction batteries are attached, the thick grid lines are fixedly connected through a conductive adhesive tape.
9. The battery assembly of claim 6, wherein: and after the thick grid lines of the two non-main grid heterojunction batteries are attached, the thick grid lines are fixedly connected through welding strips.
10. The battery assembly of claim 6, wherein: and after the thick grid lines of the two non-main grid heterojunction batteries are attached, the thick grid lines are fixedly connected through conductive adhesive.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103811565A (en) * | 2014-02-17 | 2014-05-21 | 英利能源（中国）有限公司 | Solar cell and assembly and manufacturing method thereof |
| CN210182394U (en) * | 2019-08-21 | 2020-03-24 | 苏州英鹏新能源有限公司 | Double-sided solar cell module |
| CN218957745U (en) * | 2022-10-28 | 2023-05-02 | 江苏爱康能源研究院有限公司 | Main gate-free heterojunction battery structure and battery assembly |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103811565A (en) * | 2014-02-17 | 2014-05-21 | 英利能源（中国）有限公司 | Solar cell and assembly and manufacturing method thereof |
| CN210182394U (en) * | 2019-08-21 | 2020-03-24 | 苏州英鹏新能源有限公司 | Double-sided solar cell module |
| CN218957745U (en) * | 2022-10-28 | 2023-05-02 | 江苏爱康能源研究院有限公司 | Main gate-free heterojunction battery structure and battery assembly |
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