CN214336724U - Solar cell, solar cell slice and laminated tile assembly - Google Patents

Solar cell, solar cell slice and laminated tile assembly Download PDF

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Publication number
CN214336724U
CN214336724U CN202023102172.XU CN202023102172U CN214336724U CN 214336724 U CN214336724 U CN 214336724U CN 202023102172 U CN202023102172 U CN 202023102172U CN 214336724 U CN214336724 U CN 214336724U
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solar cell
main grid
battery
region
grid lines
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不公告发明人
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Xuancheng Conch Construction Photovoltaic Technology Co ltd
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Xuancheng Ruihui Xuansheng Enterprise Management Center Partnership LP
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    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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    • Y02E10/50—Photovoltaic [PV] energy

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Abstract

The embodiment of the application provides a solar cell, solar cell section and shingling subassembly, belongs to battery technical field, solar cell includes: the battery comprises a battery body, a first side and a second side, wherein the surfaces of the battery body are respectively a first side and a second side, and the first side and the second side comprise an edge area and a middle area; the main grid line and the thin grid line are arranged perpendicular to the main grid line and are respectively arranged on the first surface and the second surface of the battery main body; in the edge area of the first surface, the main grid line on at least one side is arranged on one side close to the middle area; in the edge area of the second surface, the main grid line on at least one side is arranged on one side far away from the middle area; and in the intermediate region, the bus bars of the first and second faces are arranged in parallel and disposed as opposite sides. Through the processing scheme of the application, the battery utilization rate is improved, and the appearance is attractive.

Description

Solar cell, solar cell slice and laminated tile assembly
Technical Field
The application relates to the technical field of batteries, in particular to a solar battery, a solar battery slice and a tile-folding assembly.
Background
In recent years, solar power generation technology is developed rapidly, and efficient solar cell modules can effectively reduce installation area, software and hardware cost, transportation cost and the like. The concept of efficient solar cell modules has also been changed, and the existing mainstream packaging technologies for mass production modules include conventional, half-chip, and laminated.
Conventional components: adopt the busbar to link the structure between the conventional subassembly battery piece, a large amount of busbars use, have increased subassembly internal loss, have reduced subassembly conversion efficiency, and the difference of monolithic battery piece is under series structure simultaneously, and reverse current can increase to the subassembly influence to produce hot spot effect and damage the subassembly, influence whole photovoltaic system's operation. Fig. 1 shows a schematic structural view of a conventional module.
Half piece assembly: the half-chip assembly is a design structure which redesigns grid lines of the battery chips into patterns which can be reasonably cut into chips, and enables the positive and negative electrodes of each cut chip to adopt a bus bar link structure according to a conventional assembly arrangement mode. The half-chip technology reduces the current of the battery piece through the cutting of the chip, thereby reducing the internal loss of the component and achieving the effect of improving the conversion efficiency of the component. Fig. 2 shows a schematic construction of the half-wafer assembly.
The tile-stacking assembly comprises: the tiling technology is characterized in that grid lines of the battery pieces are redesigned into patterns which can be reasonably cut into small pieces, so that the positive and negative poles of each cut small piece meet the tiling design process; and each small piece is made into a string, the conventional welding strip series battery structure is abandoned, and the string is laminated into an assembly after series arrangement, so that the internal clearance of the assembly is fully utilized, more than 13 percent of battery pieces of the conventional assembly can be placed in the same area, and the wire loss of the assembly is reduced and the output power of the assembly is greatly improved due to the optimization of the assembly structure and the non-welding strip design. The laminated cell combines the arrangement mode of the laminated assemblies, the cell is utilized to the maximum extent, and the cutting pattern design is carried out on the cell. Figure 3 shows a schematic structural view of a shingle assembly.
Fig. 4 shows a grid line pattern of a cell for a stack tile assembly in the prior art, which mainly adopts a 3-6 equal division design in the same cutting direction, and due to the chamfering and slicing process adopted at the four corners of a monocrystalline silicon wafer, the shapes of 2 pieces at the edges and a small piece in the middle area are obviously different, so that the grid line pattern cannot be effectively utilized when the stack tile assembly is manufactured. And 2 small pieces (with chamfers) at the edges are separately manufactured into the assembly by adopting a tiling process, so that the appearance difference exists, and the aesthetic feeling is influenced.
That is, the two main existing technologies have the following drawbacks:
1. because the four corners of the mainstream monocrystalline silicon slice slicing process are chamfered, the shapes of 2 slices at the edge and a small slice in the middle area are obviously different, the slice needs to be classified for use when a tile stack assembly is manufactured, and the utilization rate of battery slices is reduced.
2. 2 small pieces (with chamfers) at the edges are independently manufactured into assembly pieces by adopting a tiling process, so that gaps exist among the assembly pieces, and the aesthetic feeling is influenced.
Disclosure of Invention
Embodiments of the present invention provide a solar cell, a solar cell slice and a laminated tile assembly, which at least partially solve the problems in the prior art.
The embodiment of the application provides a solar cell includes:
the battery comprises a battery body, a first side and a second side, wherein the surfaces of the battery body are respectively a first side and a second side, and the first side and the second side comprise an edge area and a middle area; and
the main grid line and the thin grid line are arranged on the first surface and the second surface of the battery main body; wherein:
in the edge area of the first surface, the main grid line on at least one side is arranged on one side close to the middle area;
in the edge area of the second surface, the main grid line on at least one side is arranged on one side far away from the middle area; and is
In the intermediate region, the bus bars of the first and second faces are arranged in parallel and disposed as opposite sides.
According to a specific implementation manner of the embodiment of the application, the middle region includes at least two parallel main gate lines, and the adjacent main gate lines have the same distance therebetween;
the thin grid lines between the adjacent main grid lines are connected and only connected with one of the main grid lines.
According to a specific implementation manner of the embodiment of the application, the edge region on one side includes and only includes one main gate line, and the length of the thin gate line located in the edge region and connected with the main gate line is shorter than the length of the thin gate line in the middle region.
According to a specific implementation manner of the embodiment of the application, the solar cell is square, a chamfer is arranged at the vertex of the square, and the projection width of the chamfer at the side edge corresponds to the width of the edge area.
According to a specific implementation manner of the embodiment of the present application, in the edge region of the first surface, the main gate lines on four sides are disposed on one side close to the middle region;
in the edge area of the second surface, the main grid lines on four sides are arranged on one side far away from the middle area.
According to a specific implementation manner of the embodiment of the application, the solar cell is a heterojunction cell, the cell body comprises a silicon crystal substrate, a P-type amorphous silicon layer, an intrinsic amorphous silicon layer and a positive electrode layer are sequentially arranged on one side of the silicon crystal substrate, and an N-type amorphous silicon layer, an intrinsic amorphous silicon layer and a back electrode layer are sequentially arranged on one side of the silicon crystal substrate.
In a second aspect, an embodiment of the present application provides a solar cell slice, where the solar cell slice is obtained by cutting a solar cell according to the first aspect or any one of the specific implementation manners of the first aspect, and each solar cell slice corresponds to a portion of a middle region of the solar cell, where the middle region of the solar cell slice at least includes a main grid and a plurality of thin grid lines connected to the main grid; or, the part corresponding to the edge region of the solar cell comprises a main grid and a plurality of thin grid lines connected with the main grid.
According to a specific implementation manner of the embodiment of the present application, the solar cell slices are cut along cutting lines of the solar cells, and the cutting lines are parallel to the main grid lines.
In a third aspect, a laminated assembly is provided, which includes a plurality of cut sheets, where the cut sheets are the solar cell cut sheets according to the second aspect or the specific implementation manner thereof, and the front surface and the back surface of the adjacent solar cell cut sheets are interconnected by a conductive adhesive.
According to a specific implementation manner of the embodiment of the application, the conductive adhesive comprises: the conductive adhesive comprises aluminum powder, an organic carrier, glass powder and lead oxide, wherein the organic carrier comprises an organic solvent and resin or cellulose, the weight of the glass powder and the lead oxide accounts for 1.0-6.0% of the conductive adhesive, the weight of the lead oxide accounts for 0.5-3.0% of the conductive adhesive, and the lead oxide can be selected from lead oxide, lead dioxide and lead trioxide.
The solar cell of the embodiment of the application includes: the battery comprises a battery body, a first side and a second side, wherein the surfaces of the battery body are respectively a first side and a second side, and the first side and the second side comprise an edge area and a middle area; the main grid lines and the thin grid lines are arranged perpendicular to the main grid lines and are arranged on the first surface and the second surface of the battery main body; in the edge area of the first surface, the main grid line on at least one side is arranged on one side close to the middle area; in the edge area of the second surface, the main grid line on at least one side is arranged on one side far away from the middle area; and in the intermediate region, the bus bars of the first and second faces are arranged in parallel and disposed as opposite sides. Through the processing scheme of the application, the battery utilization rate is improved, and the appearance is attractive.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a schematic structural view of a conventional module;
FIG. 2 is a schematic view of a half wafer assembly;
FIG. 3 is a schematic structural view of a shingle assembly;
FIG. 4 is a schematic structural view of a conventional solar cell;
fig. 5 is a schematic front view of a solar cell according to an embodiment of the present disclosure;
fig. 6 is a schematic backside view of a solar cell according to an embodiment of the present disclosure;
FIG. 7 is a front and back side effect diagram of a solar cell according to an embodiment of the present disclosure; and is
Fig. 8 is a schematic side view of a solar cell according to an embodiment of the present disclosure.
In the drawings, wherein:
1. a battery main body; 2. a main gate line; 3. a thin gate line; 4. cutting a line; 5. an edge region; 6. a middle region.
Detailed Description
The embodiments of the present application will be described in detail below with reference to the accompanying drawings.
The following description of the embodiments of the present application is provided by way of specific examples, and other advantages and effects of the present application will be readily apparent to those skilled in the art from the disclosure herein. It is to be understood that the embodiments described are only a few embodiments of the present application and not all embodiments. The present application is capable of other and different embodiments and its several details are capable of modifications and/or changes in various respects, all without departing from the spirit of the present application. It is to be noted that the features in the following embodiments and examples may be combined with each other without conflict. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
It is noted that various aspects of the embodiments are described below within the scope of the appended claims. It should be apparent that the aspects described herein may be embodied in a wide variety of forms and that any specific structure and/or function described herein is merely illustrative. Based on the present application, one skilled in the art should appreciate that one aspect described herein may be implemented independently of any other aspects and that two or more of these aspects may be combined in various ways. For example, an apparatus may be implemented and/or a method practiced using any number of the aspects set forth herein. Additionally, such an apparatus may be implemented and/or such a method may be practiced using other structure and/or functionality in addition to one or more of the aspects set forth herein.
It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present application, and the drawings only show the components related to the present application rather than the number, shape and size of the components in actual implementation, and the type, amount and ratio of the components in actual implementation may be changed arbitrarily, and the layout of the components may be more complicated.
In addition, in the following description, specific details are provided to facilitate a thorough understanding of the examples. However, it will be understood by those skilled in the art that the aspects may be practiced without these specific details.
First, referring to fig. 4, a general structure of a solar cell is described. As shown in fig. 4, the solar cell generally includes a cell body 1, and further includes a plurality of front side bus bars disposed parallel to each other on the front side of the cell body 1 and back side bus bars disposed on the back side of the cell body, and the regions between adjacent bus bars are portions that are subsequently cut into solar cell slices in the process of manufacturing a laminate tile assembly. In the embodiment of the application, the main grid lines are used as electrodes to collect the current generated by the battery piece.
The size of the cell main body is not limited, the distance between the adjacent main grid lines is not limited, in the embodiment of the application, the cell main body can be divided into 5 solar cells, 6 solar cells or other solar cells according to the main grid lines, the distances between the front main grid lines are equal, and therefore solar cell slices with the same size can be obtained easily. It should be understood that the spacing between the bus bars may or may not be equal.
In addition, the solar cell further comprises thin grid lines perpendicular to the main grid lines, and the solar cell slices are divided into solar cell slices through the thin grid lines. By the method, the current collection capacity can be improved, and the efficiency of the battery can be improved.
The cutting of the battery body can be performed by laser cutting or other cutting methods, which is not limited in the embodiment of the application, but the actual cutting direction may be deflected due to slight disturbance in the cutting process, and may not be perpendicular or even intersect with the main grid line, so that the deviation needs to be found in the later stacking process. In order to facilitate monitoring of a cutting process by a worker and improve cutting efficiency, in the embodiment of the present application, the solar cell further includes a cutting line disposed on the front surface of the cell main body, and a distance between the cutting line and an adjacent nearest main grid line may be, for example, 3mm to 5 mm. In addition, the cut line may be located on the rear surface of the battery main body.
The solar cell is square, and the vertex of the square is provided with a chamfer angle due to the silicon wafer process. As described above, in the prior art, the chamfer may cause a significant difference between the shapes of the 2 solar cell slices at the edge of the solar cell and the solar cell slices in the middle area, which may cause the need of sorting when manufacturing the laminated assembly, reduce the utilization rate of the solar cell, and affect the appearance. And in this application, the chamfer corresponds at the projection width of side the regional width in edge, that is to say, this application sets up the chamfer in the region of solar wafer side for independent main grid line and thin grid line region ingeniously, has avoided the sliced concatenation difference of the section in this marginal region and middle zone to can improve the cell utilization ratio, also make the outward appearance of the subassembly after the concatenation pleasing to the eye.
In the embodiment of the present application, the solar cell may be, for example, a heterojunction solar cell, and the cell body includes a silicon wafer substrate, on one side of which a P-type amorphous silicon layer, an intrinsic amorphous silicon layer, and a positive electrode layer are sequentially disposed, and on one side of which an N-type amorphous silicon layer, an intrinsic amorphous silicon layer, and a back electrode layer are sequentially disposed. By designing grid line patterns on the front surface and the back surface of the heterojunction solar cell, namely on the surfaces of the positive electrode layer and the back electrode layer, the grid line patterns at the edge chamfer positions of the cell main body are optimized, so that small pieces of corners can be directly used when the laminated cell is manufactured, and the utilization rate of the cell pieces is improved; on the other hand, small pieces of corners can be added in gaps at two ends of each string of the laminated cell, and more than 3% of cell pieces can be added on the basis of the traditional laminated assembly in unit area, so that the purposes of improving the utilization rate of the cell pieces, improving the assembly power and beautifying the appearance are achieved.
Next, the solar cell of the embodiment of the present application is specifically described with reference to fig. 5 to 8, and in fig. 5 to 8, features that are not particularly emphasized may be similar to those of the solar cell described with reference to fig. 4, and are not described again in the following description.
As shown in fig. 5, the solar cell according to the embodiment of the present application includes a cell body, which may be, for example, a heterojunction solar cell as described above.
The battery main body has a front side (first side, see fig. 5) and a back side (second side, see fig. 6), and the front side of the battery main body may include a front side edge region (region indicated by reference numeral 5 in fig. 5) and a front side middle region (region indicated by reference numeral 6 in fig. 5). The rear surface of the battery body may include a rear surface edge region (region indicated by reference numeral 5 in fig. 6) and a rear surface middle region (region indicated by reference numeral 6 in fig. 6).
Specifically, in the present embodiment, the edge region is a region near the outer periphery of the battery main body, and the middle region may be a region surrounded by the edge region. Further, in the case where the battery main body is chamfered, the edge region may be a region corresponding to the chamfered region, and the middle region is a region surrounded by the edge region. In other words, the middle region is the largest rectangular region of the battery body having the chamfering process, which is not affected by the chamfering.
In addition, as described above, the solar cell according to the embodiment of the present application further includes the bus bars as the electrodes and the thin bus bars disposed perpendicular to the bus bars, which are disposed on the front and back surfaces of the cell main body as described above.
In order to solve the problems of low utilization rate and poor aesthetics caused by chamfering of the battery body, in the embodiment of the application, in the edge region of the front side of the battery body shown by reference numeral 5 in fig. 5, the main grid lines are vertically arranged close to the outside, and in the edge region of the back side of the battery body shown by reference numeral 5 in fig. 6, the positions of the main grid lines are opposite to those of the main grid lines in the edge region in fig. 5, that is, in the edge region of the back side of the battery body, the main grid lines are vertically arranged close to the inside. In addition, in the embodiment of the application, the edge area of the front side of the battery main body and the edge area of the back side of the battery main body are the same in size and are symmetrically arranged.
That is, on the front side of the cell body, in its edge region, the busbar is arranged on the side remote from the intermediate region. On the back side of the cell body, in the edge region thereof, the bus bar is disposed on a side close to the middle region.
It should be understood that although it is described above that the bus bars on the front surface are disposed outward and the bus bars on the back surface are disposed inward, the bus bars on the front surface may be disposed outward and the bus bars on the back surface may be disposed inward, which is not limited herein.
In addition, although 2 pieces of edge regions are shown in fig. 5 and 6, in the case where the middle region is rectangular, the battery main body may include 4 pieces of edge regions surrounding the middle rectangular region. In addition, although fig. 5 and 6 show that all the bus bars on the front surface are disposed to the outside and all the bus bars on the back surface are disposed to the inside, the embodiment of the present application is not limited thereto, and in fact, for the front surface or the back surface of the battery main body, at least one side of the bus bars is disposed on the side close to the middle region and at least one side of the bus bars on the other surface is disposed on the side far from the middle region.
Preferably, in the edge region of the first surface, the bus bars on four sides are disposed on one side close to the middle region; in the edge area of the second surface, the main grid lines on four sides are arranged on one side far away from the middle area.
In addition, in the middle region of the battery body, the front and rear bus bars may be arranged in parallel, but in the present embodiment, the front and rear bus bars are disposed at opposite sides. Specifically, for example, the front bus bars of the middle region of the battery main body may be disposed vertically to the left, and the back bus bars may be designed vertically to the right. In addition, the front and back sides of the middle region of the cell body can be designed as 1-10 chips, and the chip patterns of the front and back sides are completely symmetrical.
It should be understood that although the foregoing describes the bus bars on the front side as being disposed vertically to the left, the bus bars on the back side are designed to be disposed vertically to the right. However, the embodiment of the present application is not limited thereto, and in practice, the main gate may be disposed to be transverse, and the main gate line on the front surface may be disposed to be upper and the main gate line on the rear surface may be designed to be lower.
In other words, in the present embodiment, the bus bars are arranged in the same direction on the front and back surfaces of the battery main body, but the bus bars on the front and back surfaces are disposed close to one side in different directions.
Specifically, as shown in fig. 7, according to a specific implementation manner of the embodiment of the present application, in the middle region of the front surface of the battery main body, the rightmost one of the bus bars is located at the rightmost side of the middle region, and in the middle region of the back surface of the battery main body, the leftmost one of the bus bars is located at the leftmost side of the middle region. However, it should be understood that the arrangement of the bus bars according to the embodiment of the present application is not limited thereto, and for example, in the middle region of the front surface of the battery body, the leftmost one of the bus bars is located at the leftmost side of the middle region, and in the middle region of the rear surface of the battery body, the rightmost one of the bus bars is located at the rightmost side of the middle region. That is, the bus bars are arranged in the same direction in the front and rear surfaces of the battery main body, but are disposed close to one side in different directions. Fig. 8 shows a schematic side view of a solar cell of an embodiment of the present application.
In addition, similar to the solar cell described with reference to fig. 4, in the embodiment of the present application, a solar cell slice is further provided, where the solar cell slice is obtained by cutting the solar cell, and each solar cell slice corresponds to a portion of the middle region of the solar cell, where the middle region of the solar cell includes at least one main grid and a plurality of fine grid lines connected to the main grid; or, the part corresponding to the edge region of the solar cell comprises a main grid and a plurality of thin grid lines connected with the main grid.
The solar cell slice is obtained by cutting along cutting lines of the solar cells, and the cutting lines are parallel to the main grid lines. That is, the solar cells may be divided into solar cell slices according to the bus bars, and the intervals between the adjacent bus bars are equal at least in the middle regions of the front and back surfaces of the cell main body, so that the solar cells having the same width may be conveniently obtained. It should be understood that the spacing between adjacent bus bars may not be equal. In the embodiment of the present application, the middle region includes at least two parallel main gate lines, and adjacent main gate lines have the same spacing therebetween.
In addition, the solar cell according to the embodiment of the application can further comprise thin grid lines, and the thin grid lines are arranged between the adjacent main grid lines. In each solar cell slice, the thin grid lines are arranged perpendicular to the main grid lines, so that the solar cell slice is divided into solar cell slices, and the thin grid lines are connected with and only connected with one of the main grid lines. By the method, the current collection capacity can be improved, and the efficiency of the battery can be improved.
In the embodiment of the present application, since the battery main body includes the edge region and the middle region, only one bus bar is included in the edge region of one side, and the length of the thin bus bar located in the edge region and connected to the bus bar is shorter than that of the thin bus bar in the middle region. In fact, in the embodiment of the present application, the length of the thin grid line in the edge region corresponds to the chamfer region, so that a regular solar cell slice can be obtained to the greatest extent, and the utilization rate of the solar cell is improved.
In the present embodiment, as described above, the solar cell may be a single-sided cell or a double-sided cell such as a heterojunction cell. That is, the type of the solar cell in the embodiment of the present application is not limited, and the solar cell may be a monocrystalline silicon wafer, a polycrystalline silicon wafer, or a cell made of other materials.
According to a specific implementation manner of the embodiment of the present application, for a single solar cell slice, as shown in fig. 7, the slice includes main grid lines respectively disposed on the front surface and the back surface of the solar cell slice, and the main grid lines on the front surface and the back surface are respectively disposed on different end portions of the solar cell slice. Specifically, as shown in the uppermost solar cell slice in fig. 7, the main grid lines on the front surface are disposed at the lower end of the shingled cell unit, and the main grid lines on the back surface are disposed at the upper end of the shingled cell unit.
As described above, in the embodiment of the application, the grid line pattern at the edge chamfer position of the cell main body is optimized by designing the grid line patterns on the front and back sides of the solar cell, so that small pieces of corners can be directly used when the tiled cell is manufactured, and the utilization rate of the cell pieces is improved; on the other hand, small pieces of corners can be added in gaps at two ends of each string of the laminated cell, and more than 3% of cell pieces can be added on the basis of the traditional laminated assembly in unit area, so that the purposes of improving the utilization rate of the cell pieces, improving the assembly power and beautifying the appearance are achieved.
The solar cell of the embodiment of the present application is described above with reference to the drawings, and the solar cell slice of the embodiment of the present application can be obtained by cutting the solar cell as described above. Each solar cell slice obtained corresponds to a portion of the middle region of the solar cell as described above that includes at least one main grid and a number of thin grid lines connected to the main grid. For the edge region, the solar cell slice comprises a main grid of the edge region and parts of a plurality of thin grid lines connected with the main grid.
The solar cell can be cut along the cutting line, so that a solar cell slice can be obtained. Specifically, laser cutting may be employed, and other cutting methods may also be employed. Through setting up the line of cut, can prevent because slight disturbance in cutting process, lead to actual cutting direction to take place to deflect, avoid looking for partially in the stack in later stage, improved cutting efficiency.
The application also provides a stack tile subassembly, and this stack tile subassembly includes a plurality of sections, the section is aforementioned solar cell section, and is adjacent through the conducting resin interconnection between the solar cell section adjacent solar cell section openly and the back.
In order to obtain a laminated module, the solar cell slices as described above need to be connected, and specifically, adjacent solar cell slices are interconnected through a conductive adhesive. Specifically, the front and back surfaces of adjacent solar cell slices may be connected by a conductive adhesive, thus obtaining a shingle assembly.
In the embodiment of the present application, the conductive paste composition includes: aluminum powder; an organic vehicle; glass powder; and lead oxide. Wherein, the organic carrier comprises organic solvent and resin or cellulose. The glass powder and the lead oxide account for 1.0-6.0 wt% of the conductive adhesive, and the lead oxide accounts for 0.5-3.0 wt% of the conductive adhesive. The lead oxide can be selected from lead oxide (PbO) and lead dioxide (PbO)2) Lead tetraoxide (Pb)3O4) Etc., but are not limited thereto. In the present application, the conductive paste composed of these components is referred to as a conductive paste for a solar cell.
The glass powder with a melting point lower than that of lead oxide (e.g. about 500 ℃) is firstly melted in the sintering process (about 720 ℃ to 820 ℃) by matching the glass powder and the lead oxide according to a specific proportion, so that a path for burning through the back passivation layer (hereinafter referred to as a burn-through path) is formed. Then, as the temperature increases, the lead oxide having a higher melting point melts and burns through (breaks down) the back passivation layer along the burn-through path.
Then, aluminum in the conductive adhesive and silicon of the silicon-based solar cell are mutually diffused at a melting interface of the burned-through passivation layer, and along with the temperature rise of the sintering section, the molten aluminum soup is more quickly acted with the silicon substrate, so that the aluminum is diffused into the silicon substrate. Thus, the electrical characteristics of the solar cell can be improved, and the manufacturing process of the back passivated silicon based solar cell is simplified.
The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present application should be covered within the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims (10)

1. A solar cell, comprising:
the battery comprises a battery body, a first side and a second side, wherein the surfaces of the battery body are respectively a first side and a second side, and the first side and the second side comprise an edge area and a middle area; and
the battery comprises a main grid line and a thin grid line which is perpendicular to the main grid line, wherein the main grid line and the thin grid line are respectively arranged on a first surface and a second surface of a battery main body; wherein:
in the edge area of the first surface, the main grid line on at least one side is arranged on one side close to the middle area;
in the edge area of the second surface, the main grid line on at least one side is arranged on one side far away from the middle area; and is
In the intermediate region, the first and second faces are arranged in parallel with the bus bars belonging to one region and are disposed as opposite sides.
2. The solar cell of claim 1, wherein the middle region comprises at least two parallel main grid lines, and adjacent main grid lines have the same distance therebetween;
the thin grid lines between the adjacent main grid lines are connected and only connected with one of the main grid lines.
3. The solar cell according to claim 1, comprising only one bus bar in the edge region of one side, wherein the length of the thin gate line in the edge region and connected to the bus bar is shorter than that of the thin gate line in the middle region.
4. The solar cell according to claim 1, wherein the solar cell is square, and a chamfer is provided at the vertex of the square, and the projection width of the chamfer at the side edge corresponds to the width of the edge region.
5. The solar cell of claim 4, wherein in the edge region of the first surface, the bus bars at four sides are disposed at a side close to the middle region;
in the edge area of the second surface, the main grid lines on four sides are arranged on one side far away from the middle area.
6. The solar cell according to any one of claims 1 to 4, wherein the solar cell is a heterojunction cell, and the cell body comprises a silicon crystal substrate on one side of which a P-type amorphous silicon layer, an intrinsic amorphous silicon layer and a positive electrode layer are sequentially disposed, and on one side of which an N-type amorphous silicon layer, an intrinsic amorphous silicon layer and a back electrode layer are sequentially disposed.
7. Solar cell slices, obtained by cutting the solar cells according to any one of claims 1 to 5, wherein each solar cell slice corresponds to a portion of the middle region of the solar cell, which includes at least one main grid and a plurality of fine grid lines connected with the main grid; or, the part corresponding to the edge region of the solar cell comprises a main grid and a plurality of thin grid lines connected with the main grid.
8. The solar cell slice according to claim 7, wherein the solar cell slice is cut along a cutting line of the solar cell, and the cutting line is parallel to the bus bar.
9. A laminated tile assembly comprising a plurality of cut sheets, wherein the cut sheets are the cut sheets of solar cells according to any one of claims 7-8, and the front and back surfaces of adjacent cut sheets of solar cells are interconnected by a conductive adhesive.
10. The shingle assembly of claim 9 wherein the conductive adhesive is a solar cell conductive adhesive.
CN202023102172.XU 2020-12-18 2020-12-18 Solar cell, solar cell slice and laminated tile assembly Active CN214336724U (en)

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