CN109728107B - Solar cell module - Google Patents
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- CN109728107B CN109728107B CN201711044637.0A CN201711044637A CN109728107B CN 109728107 B CN109728107 B CN 109728107B CN 201711044637 A CN201711044637 A CN 201711044637A CN 109728107 B CN109728107 B CN 109728107B
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Abstract
The invention discloses a solar cell module, wherein the surface of any short side part in the light receiving side of a cell sheet is in overlapped contact with the surface of the other short side part in the backlight side of the adjacent cell sheet along the long side direction of the cell sheet to form a cell string in series, namely, the cell sheets are mutually connected in series in a short side overlapping mode, so that the area of the overlapping part between the cell sheets can be effectively reduced, the current loss between the cell sheets is effectively reduced, the effective light absorption area is increased, and the power generation capacity can be improved; and the short edge of the cell is not a cutting surface under the normal condition, the short edges of the cell are overlapped without risks of hidden cracking, breaking and the like, and the yield of the solar cell module can be effectively improved.
Description
Technical Field
The invention relates to the field of new energy, in particular to a solar cell module.
Background
With the continuous innovation of the crystalline silicon solar cell technology, the related cell technology is also remarkably developed at present, wherein the tiling technology is a technology which is popular nowadays and is used for improving the luminous efficiency of solar modules.
In the conventional solar cell module, the cells are connected by the bus bars, the consumption of the interior of the solar cell module is increased by using a large number of bus bars, and a blank region which cannot be used for converting light energy into electric energy is formed between the cells, thereby reducing the conversion efficiency of the solar cell module.
The tiling technology is popular, namely, the battery pieces are reasonably cut into small pieces, the cut small pieces are welded according to a pre-designed tiling process to manufacture battery strings, and the battery strings are subjected to series-parallel connection typesetting and then pressed into assemblies. The reasonable application of the tile-stacking technology can place more cells in a limited plane range, and meanwhile, the line loss of the solar module is reduced, and the output power of the module is greatly improved.
However, in the prior art, the cut battery pieces are generally rectangular or quasi-rectangular, that is, the battery pieces include long sides and short sides, and when a plurality of battery pieces are welded according to a pre-designed tiling process to manufacture a battery string, adjacent battery pieces are generally connected in series such that the long sides overlap, so as to manufacture the battery string. At the moment, because the long edges of the adjacent battery pieces are overlapped, the manufactured battery string has serious problems of hidden cracks, broken pieces and the like. Thereby influencing the yield and the power generation capacity of the whole solar cell module.
Disclosure of Invention
The invention aims to provide a solar cell module which can effectively reduce current loss among a plurality of cells forming a cell string.
In order to solve the above technical problem, the present invention provides a solar cell module, where the solar cell module includes at least one cell string, and the cell string includes at least two cells;
the battery piece comprises a long edge and a short edge, and at least one first front main grid line and a plurality of front auxiliary grid lines intersecting with the first front main grid line are arranged on the light receiving side of the battery piece;
the backlight side of the battery piece is provided with at least one first back main grid line and a plurality of back auxiliary grid lines intersected with the first back main grid line;
the surface of any short side part on the light receiving side of the battery piece is in overlapped contact with the surface of the other short side part on the backlight side of the battery piece adjacent to the long side direction of the battery piece so as to form the battery string in series, and the short side part is an area with the distance from the short side of the battery piece within a preset range.
Optionally, the length of the short edge part in the direction parallel to the long edge of the battery piece has a value range: 1.5mm to 3mm, inclusive.
Optionally, the first front main grid line and the first back main grid line are both parallel to the long edge of the battery piece.
Optionally, the distances from the first front main grid line to the two long sides of the battery piece are equal, and the distances from the first back main grid line to the two long sides of the battery piece are equal.
Optionally, the front side secondary grid line and the back side secondary grid line are both parallel to the short edge of the battery piece.
Optionally, the distances between any two adjacent front side sub-grid lines are equal;
and the distances between any two adjacent back side auxiliary grid lines are equal.
Optionally, the width of the first front-side main gate line has a value range of: 0.3mm to 1.2mm, inclusive;
the width of the first back main grid line has a value range as follows: 0.3mm to 1.2mm, inclusive.
Optionally, a second front main gate line intersecting the first front main gate line is disposed on the surface of any one of the short side portions on the light receiving side of the cell, and a second back main gate line intersecting the first back main gate line is disposed on the surface of the other short side portion on the back light side of the cell;
and the second back main grid line of the battery piece is contacted with the second front main grid line of the adjacent battery piece along the long edge direction of the battery piece so as to form the battery string.
Optionally, the second front main grid line is attached to any short side of the battery piece;
the second back main grid line is attached to the other short side of the battery piece.
Optionally, the solar cell includes a plurality of the cell strings, and any two of the cell strings are connected in parallel or in series.
According to the solar cell module provided by the invention, the surface of any short side part in the light receiving side of the cell and the surface of the other short side part in the backlight side of the cell adjacent to the long side direction of the cell are in overlapped contact, so that the cell string is formed by connecting the cells in series, namely the cells are connected in series in a short side overlapped mode, the area of the overlapped part between the cells can be effectively reduced, the current loss between the cells can be effectively reduced, the effective light absorption area is increased, and the power generation amount can be improved; and the short edge of the cell is not a cutting surface under the normal condition, the short edges of the cell are overlapped without risks of hidden cracking, breaking and the like, and the yield of the solar cell module can be effectively improved.
Drawings
In order to more clearly illustrate the embodiments or technical solutions of the present invention, the drawings used in the description of the embodiments or the prior art 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 it is obvious for those skilled in the art that other drawings can be obtained based on these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a light receiving side of a battery cell according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a backlight side of a battery plate according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a battery string according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a light receiving side of another cell provided in the embodiment of the invention;
fig. 5 is a schematic structural diagram of a backlight side of another battery piece according to an embodiment of the invention;
fig. 6 is a side view of another battery string provided by an embodiment of the present invention;
fig. 7 is a schematic structural diagram of a solar cell module according to an embodiment of the present invention;
fig. 8 is a schematic structural diagram of another solar cell module according to an embodiment of the present invention.
In the figure: 100. the cell comprises a cell piece, 101, a first front main grid line, 102, a first back main grid line, 103, a second front main grid line, 104, a second back main grid line, 201, a front auxiliary grid line, 202, a back auxiliary grid line, 300, a short side part, 400, a cell string and 500, and a frame.
Detailed Description
The core of the invention is to provide a solar cell module. In the prior art, the cut battery pieces are generally rectangular or quasi-rectangular, that is, the battery pieces include long sides and short sides, and when a plurality of battery pieces are welded according to a pre-designed tiling process to manufacture a battery string, adjacent battery pieces are generally connected in series in a manner that the long sides are overlapped to manufacture the battery string. Since the length of the long side of the cell is usually longer and the length of the long side of the cell is usually 2 to 10 times of the length of the short side, when the cell string is prepared in a manner that the long sides are overlapped, a large area of coverage is caused between two adjacent cells, the covered portion cannot absorb light to generate electricity, and only electric energy is consumed to generate heat, so that a large current loss is caused. Meanwhile, in the prior art, when the original battery piece is cut into small battery pieces, the cutting is usually performed along the main grid lines arranged on the original battery piece, namely, the long edge of the battery piece is a cutting surface. The cut portion is inevitably damaged during the cutting process. If adjacent battery pieces are connected in series in a long-edge overlapping mode when the battery string is prepared, cutting surfaces are overlapped, and the battery string has serious problems of hidden cracks, fragments and the like. In addition, the adjacent battery pieces are usually connected to each other by using a conductive adhesive, and in this case, the adhesive needs to be dispensed near the long sides of the battery pieces. Due to the fact that the dispensing area is too long, the conductive adhesive is prone to overflowing during dispensing, and accordingly a large number of black chips are caused.
In the solar cell module provided by the invention, the side surface of any short edge part of the cell sheet positioned on the light receiving side of the cell sheet is contacted with the side surface of any short edge part of the adjacent cell sheet positioned on the backlight side of the cell sheet, and the cell sheets are mutually connected in series to form the cell string, namely, the cell sheets are mutually connected in series in a short edge overlapping mode, so that the area of the overlapping part between the cell sheets can be effectively reduced, the current loss between the cell sheets is effectively reduced, the effective light absorption area is increased, and the power generation amount can be improved; in addition, the short edge of the cell is not a cutting surface under normal conditions, the short edges of the cell are overlapped without risks of hidden cracks, breakage and the like, and the yield of the solar cell module can be effectively improved; because the short edges of the adjacent battery pieces are overlapped, the dispensing area is short, and the conductive adhesive is not easy to overflow, thereby reducing the generation of black piece phenomenon.
In order that those skilled in the art will better understand the disclosure, the invention will be described in further detail with reference to the accompanying drawings and specific embodiments. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. 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 invention.
Referring to fig. 1, fig. 2 and fig. 3, fig. 1 is a schematic structural diagram of a light receiving side of a battery cell according to an embodiment of the present invention; fig. 2 is a schematic structural diagram of a backlight side of a battery plate according to an embodiment of the present invention; fig. 3 is a schematic structural diagram of a battery string according to an embodiment of the present invention.
In the embodiment of the present invention, the solar cell module includes at least one cell string 400, and the cell string 400 includes at least two cells 100.
The battery string 400 is formed by overlapping a plurality of battery pieces 100, the overlapping of the plurality of battery pieces 100 is equivalent to the series connection, and the plurality of battery pieces 100 are usually bonded and connected with each other by conductive adhesive. In the embodiment of the present invention, the battery string 400 is specifically composed of how many battery sheets 100, and is not particularly limited. The specific type and specific components of the conductive adhesive are also not particularly limited, and the object of the present invention can be achieved as long as the adjacent battery pieces 100 can be connected with each other and are conductive. Of course, besides using conductive paste, other materials may be used to connect the adjacent battery cells 100, such as solder paste, flexible conductive medium, strip-shaped solder strip, etc., and there is no particular limitation on which material is used to connect the adjacent conductive strips in this embodiment of the present invention.
Referring to fig. 1 and 2, in the embodiment of the invention, the battery piece 100 includes a long side and a short side, and at least one first front-side main grid line 101 and a plurality of front-side sub-grid lines 201 intersecting the first front-side main grid line 101 are disposed on a light receiving side of the battery piece 100; at least one first back main grid line 102 and a plurality of back sub-grid lines 202 intersecting the first back main grid line 102 are arranged on the backlight side of the battery piece 100.
At present, the battery piece 100 is generally formed by cutting a primary battery piece with a larger volume according to a predetermined layout, and in general, the primary battery piece is square or quasi-square, wherein the shape of the primary battery piece may not be a standard square, for example, four corners of the primary battery piece are rounded corners, or four corners of the primary battery piece are cut off during manufacturing, so the primary battery piece is generally square or quasi-square. During the cutting process, the cutting is generally performed along the long side of the battery piece 100, that is, the long side of the battery piece 100 is generally a cut surface, and the short side of the battery piece 100 is generally a non-cut surface. The battery piece 100 after cutting is generally rectangular or quasi-rectangular, and since the battery piece may be quasi-rectangular, the battery piece 100 cut from the left and right sides of the battery piece after cutting is not standard rectangular, but quasi-rectangular, wherein two corners of the battery piece 100 shaped as quasi-rectangular on the same long side may be rounded or cut off to form two sides, but the overall shape of the battery piece 100 is generally rectangular, and the battery piece 100 has two long sides and two short sides. In general, the cell sheet 100 has a surface facing the sun and a surface facing away from the sun, wherein the surface facing the sun is generally referred to as a light receiving side, also referred to as a front surface; the side facing away from the sun is usually referred to as the backlight side, also called the back side.
In the embodiment of the invention, at least one first front side main grid line 101 and a plurality of front side sub-grid lines 201 intersecting with the first front side main grid line 101 are arranged on the light receiving side of the battery piece 100, the first front side main grid line 101 is generally connected with two short sides of the battery piece 100, and preferably, the first front side main grid line 101 is parallel to the long side of the battery piece 100. A plurality of front side secondary grid lines 201 are also generally distributed on the light receiving side of the cell 100, and the front side secondary grid lines 201 are generally used for collecting carriers generated when the cell 100 is irradiated by light, that is, for guiding current generated when the cell 100 works; the first front main grid line 101 is used for collecting the current generated by each front sub-grid line, and is mainly used for collecting the current generated by the plurality of front sub-grid lines.
In the embodiment of the present invention, the number of the first front surface bus bars 101 is not particularly limited. Typically, only one first front side busbar 101 is provided per cell 100. In the embodiment of the present invention, the number of the front side sub-grid lines 201 is not particularly limited. Typically, each cell 100 will be provided with dozens or dozens of front side finger lines 201. Since the front side sub-grid lines 201 are used for collecting carriers generated when the cell piece 100 is irradiated by light, it is preferable that the plurality of front side sub-grid lines 201 are uniformly distributed on the surface of the cell piece 100 on the light receiving side. In general, the plurality of front side finger lines 201 are parallel to the short side of the battery piece 100, and the distance between any two adjacent front side finger lines 201 is equal, that is, the plurality of front side finger lines 201 are uniformly distributed on the surface of the battery piece 100 on the light receiving side.
Similar to the above, the backlight side of the battery cell 100 is provided with at least one first back main grid line 102 and a plurality of back sub-grid lines 202 intersecting the first back main grid line 102, the first back main grid line 102 is generally connected with two short sides of the battery cell 100, and preferably, the first back main grid line 102 is parallel to the long side of the battery cell 100. Since the carriers collected by the front side finger lines 201 are different from the carriers collected by the back side finger lines 202 in normal operation of the battery sheet 100 when the battery sheet is illuminated, for example, if the carriers collected by the front side finger lines 201 are holes, the carriers collected by the back side finger lines 202 are electrons. Therefore, in a normal case, the back side grating 202 also serves to guide the current generated when the battery piece 100 operates; the first back side main grid line 102 is mainly used for collecting current generated by a plurality of back side sub grid lines.
In the embodiment of the present invention, the number of the first back bus bars 102 is not particularly limited. Typically, only one first back bus bar 102 is provided per cell 100. In the embodiment of the present invention, the number of the back side sub-gate lines 202 is not particularly limited. Typically, each cell 100 will be provided with tens or tens of back side finger lines 202. Preferably, the plurality of back side sub-grid lines 202 are uniformly distributed on the surface of the back light side of the battery piece 100. In general, the plurality of back side finger lines 202 are parallel to the short side of the battery piece 100, and the distance between any two adjacent back side finger lines 202 is equal, that is, the plurality of back side finger lines 202 are uniformly distributed on the surface of the battery piece 100 on the backlight side.
The front side finger 201 is generally perpendicular to the first front side finger 101, and the back side finger 202 is generally perpendicular to the first back side finger 102. The cell 100 corresponds to a battery, wherein the first front main grid line 101 disposed on the light receiving side of the cell 100 and the first back main grid line 102 disposed on the backlight side of the cell 100 correspond to two electrodes of the battery.
Referring to fig. 3, in the embodiment of the present invention, a surface of any one short side portion 300 of the light receiving side of the cell 100 is in overlapping contact with a surface of another short side portion 300 of the backlight side of the cell 100 adjacent in the longitudinal direction of the cell 100 to form the cell string 400 in series, and the short side portion 300 is a region having a distance from the short side of the cell 100 within a preset range.
In the embodiment of the present invention, when a plurality of battery pieces 100 are connected in series to form a battery string 400, the battery string 400 is configured by overlapping adjacent short side portions 300 between two adjacent battery pieces 100 in the longitudinal direction of the battery pieces 100 with each other. Since the light receiving sides of the plurality of battery pieces 100 need to be located on the same side of the whole battery string 400, two battery pieces 100 adjacent to each other in the longitudinal direction of the battery pieces 100 are overlapped on the light receiving side of another battery piece 100 through the backlight side of one battery piece 100, so that the battery string 400 is formed in series. That is, the surface of any short side portion 300 on the light receiving side of the cell piece 100 is overlapped and contacted with the surface of the other short side portion 300 on the backlight side of the cell piece 100 adjacent to the long side direction of the cell piece 100 to form the cell string 400 in series, and the short side portion 300 is a region having a distance from the short side of the cell piece 100 within a predetermined range.
The short side 300 is a region having a distance from the short side of the battery cell 100 within a predetermined range. In order to avoid an excessively large overlapping area between two adjacent battery pieces 100, the area of the short side portion 300 is usually small, and the length of the short side portion 300 along a direction parallel to the long side of the battery piece 100 has a range: 1.5mm to 3mm, inclusive. In general, the front side minor grid lines 201 are also distributed on the surface of the short side portion 300 on the light receiving side of the battery piece 100, and the back side minor grid lines 202 are also distributed on the surface of the short side portion 300 on the backlight side of the battery piece 100.
When two adjacent battery pieces 100 are connected in series with each other such that the short side portions 300 overlap with each other, a surface of one of the short side portions 300 on the light receiving side of the battery piece 100 and a surface of the other short side portion 300 on the backlight side of the battery piece 100 adjacent in the longitudinal direction of the battery piece 100 may be completely bonded, or may not be completely bonded, but only partially bonded. In the above description, the length of the short side 300 along the direction parallel to the long side of the battery piece 100 has a value range: 1.5mm to 3mm, but the length of the region where two adjacent short side portions 300 overlap in a direction parallel to the long sides of the battery cell 100 may be smaller than the length of the short side portions 300 in that direction. Of course, two adjacent battery pieces 100 may not be completely flush with each other and connected in series, that is, the side edges of the two adjacent battery pieces 100 located on the same side may not be on the same straight line. In the embodiment of the present invention, the size of the overlapping region between two adjacent battery sheets 100 along the longitudinal direction of the battery sheet 100 is not particularly limited.
When the battery string 400 is formed by connecting more than two battery pieces 100 in series, the battery pieces 100 are firstly distributed along the longitudinal direction of the battery pieces 100, secondly the adjacent battery pieces 100 are connected in series by the way that the short side parts 300 are in mutual overlapping contact, and simultaneously the light receiving sides of the battery pieces 100 are ensured to be positioned at the same side.
In the embodiment of the present invention, the first front side busbar 101 disposed on the light receiving side of the battery sheet 100 may be located in the middle of the surface of the light receiving side of the battery sheet 100, that is, the distances from the first front side busbar 101 to the two long sides of the battery sheet 100 are equal; meanwhile, the first back main grid line 102 disposed on the backlight side of the battery piece 100 may be located in the middle of the surface of the backlight side of the battery piece 100, that is, the distances from the first back main grid line 102 to the two long sides of the battery piece 100 are equal.
Preferably, in the embodiment of the present invention, the width of the first front-side bus bar 101, that is, the range of the distance between two long sides of the first front-side bus bar 101 may be: 0.3mm to 1.2mm, inclusive; correspondingly, the width of the first back side bus bar, that is, the range of the distance between the two long sides in the first back side bus bar 102, may be: 0.3mm to 1.2mm, inclusive. In the prior art, the width of the bus bar is typically between 1.0mm and 2.0 mm. In the solar cell module provided by the embodiment of the invention, the width of the main grid line of the cell 100 can be reduced to 0.3mm to 1.2mm, which is beneficial to reducing the shielded area of the light receiving side of the cell 100 and increasing the light receiving area of the cell 100, thereby improving the conversion efficiency of the cell 100. Meanwhile, in the solar cell module provided by the embodiment of the invention, the first front side main grid line 101 and the first back side main grid line 102 of the cell piece 100 can be positioned in the middle of the cell piece 100, which is beneficial to more uniformly collecting the current generated by the cell piece 100.
In the embodiment of the present invention, since the widths of the front side sub-gate line 201 and the back side sub-gate line 202 are too thin, and the widths of the two sub-gate lines are much smaller than the widths of the first front side main gate line 101 and the first back side sub-gate line 202, in the embodiment of the present invention, the value ranges of the widths of the front side sub-gate line 201 and the back side sub-gate line 202 are not specifically limited.
According to the solar cell module provided by the invention, the side surface of any short side part 300 of the cell 100, which is positioned on the light receiving side of the cell 100, is contacted with the side surface of any short side part 300 of the adjacent cell 100, which is positioned on the backlight side of the cell 100, so that the cell string 400 is formed by mutual series connection, namely the cell 100 are mutually connected in series in a short side overlapping mode, the area of the overlapping part between the cells 100 can be effectively reduced, the current loss between the cells 100 is effectively reduced, the effective light absorption area is increased, and the power generation capacity can be improved; in addition, the short edge of the cell piece 100 is not a cutting surface under normal conditions, the short edges of the cell piece 100 are overlapped without risks of hidden cracks, broken pieces and the like, and the yield of the solar cell module can be effectively improved.
In the present invention, if only the short side portions 300 between two adjacent battery pieces 100 in the long side direction of the battery piece 100 in a certain battery string 400 are connected by overlapping with conductive materials, the conductive resistance between the two battery pieces 100 is very large, which causes a serious current loss and affects the conversion efficiency of the battery pieces 100. A second front side bus bar 103 and a second back side bus bar 104 may be further provided in the present invention. The details will be described in detail in the following inventive examples.
Referring to fig. 4, fig. 5, fig. 6, fig. 7 and fig. 8, fig. 4 is a schematic structural view of a light receiving side of another battery cell according to an embodiment of the present invention; fig. 5 is a schematic structural diagram of a backlight side of another battery piece according to an embodiment of the invention; fig. 6 is a side view of another battery string provided by an embodiment of the present invention; fig. 7 is a schematic structural diagram of a solar cell module according to an embodiment of the present invention; fig. 8 is a schematic structural diagram of another solar cell module according to an embodiment of the present invention.
In the embodiment of the present invention, on the basis of the above embodiment of the present invention, a second front side main grid line 103 is further disposed on the light receiving side of the battery cell 100, and a second back side main grid line 104 is disposed on the backlight side of the battery cell 100.
Referring to fig. 4 and 5, in the embodiment of the invention, a second front side main gate line 103 intersecting with the first front side main gate line 101 is disposed on a surface of any one of the short side portions 300 on the light receiving side of the cell 100, and a second back side main gate line 104 intersecting with the first back side main gate line 102 is disposed on a surface of the other short side portion 300 on the backlight side of the cell 100.
The second front main grid line 103 and the second back main grid line 104 are respectively located at two short side portions 300 of the same battery piece 100, and the first front main grid line 101 and the second front main grid line 103 need to intersect to conduct current generated by the battery piece 100; it is also desirable that the first back side bus bar 102 intersect the second back side bus bar 104 to conduct the current generated by the cell 100. In general, the second front main grid line 103 is connected to two long edges of the battery piece 100, and the second back main grid line 104 is also connected to two long edges of the battery piece 100. Preferably, the second front main grid line 103 may be parallel to the short side of the battery piece 100, and the second back main grid line 104 may also be parallel to the short side of the battery piece 100.
Referring to fig. 6, in the embodiment of the invention, the second back side main grid line 104 of the battery piece 100 is in contact with the second front side main grid line 103 of the adjacent battery piece 100 along the long side direction of the battery piece 100 to form the battery string 400.
In the embodiment of the invention, the second front main grid line 103 is disposed on the surface of any short side portion 300 on the light receiving side of the battery piece 100, and the second back main grid line 104 is disposed on the surface of the other short side portion 300 on the backlight side of the battery piece 100. In the invention, the adjacent battery pieces 100 along the long side direction of the battery pieces 100 are connected in series by contacting the second front main grid line 103 and the second back main grid line 104 of different battery pieces 100 respectively to obtain the battery string 400. In the embodiment of the present invention, the battery string 400 is specifically composed of how many battery sheets 100, and is not particularly limited. No matter the first front main gate line 101, the second front main gate line 103, the first back main gate line 102 or the second back main gate line 104 are usually formed by sintering silver paste at the present stage, the conductivity of the first front main gate line is very good, and since the second front main gate line 103 and the second back main gate line 104 are much wider than the front sub-gate line 201 and the back sub-gate line 202, the resistance values of the second front main gate line 103 and the second back main gate line 104 are very small, the conductive resistance between the two battery slices 100 can be effectively reduced by connecting the two battery slices 100 in series through the second front main gate line 103 and the second back main gate line 104 respectively located on the two battery slices 100, so that the current loss between the battery slices 100 is reduced, and the conversion efficiency of the battery slices 100 is increased.
In the embodiment of the present invention, the materials of the first front side bus bar 101, the second front side bus bar 103, the first back side bus bar 102, and the second back side bus bar 104 are not particularly limited. In this embodiment of the present invention, the width of the second front side bus bar 103, that is, the range of the distance between two long sides of the second front side bus bar 103, may be: 0.3mm to 1.2mm, inclusive; correspondingly, the width of the second back side main gate line 104, that is, the range of the distance between the two long sides in the second back side main gate line 104, may be: 0.3mm to 1.2mm, inclusive. Preferably, in order to minimize the overlapping area between adjacent battery pieces 100 in the same battery string 400, the second front side busbar 103 may be attached to any short side of the battery piece 100; the second back main grid line may be attached to the other short side of the battery cell 100. The second front main grid line 103 and the second back main grid line 104 may be respectively attached to short edges of two end portions of the battery pieces 100, so that when the battery strings 400 are connected in series, the overlapping area between the adjacent battery pieces 100 is reduced as much as possible.
In the embodiment of the present invention, the solar cell module may include a plurality of the cell strings 400, and any two of the cell strings 400 may be connected in parallel or in series. In general, a solar cell module may include a plurality of cell strings 400, and each cell string 400 may be formed by connecting a plurality of cell strings 400 in parallel. And the plurality of cell string groups are connected in series or in parallel to finally form the whole solar cell module. Of course, the solar cell module may have only one cell string group, or even only one cell string 400. In the embodiment of the present invention, the number of the battery strings 400 in the solar battery module is not specifically limited, and the connection manner between the plurality of battery strings 400 is also not specifically limited, as the case may be.
Referring to fig. 7 and 8, for a solar cell module, a frame 500 for fixing the cell string 400 and sealing the solar cell module is generally provided. Of course, the solar cell module may not be provided with the frame 500, and is not particularly limited in the embodiment of the present invention as the case may be. The battery string 400 provided by the embodiment of the invention is also substantially rectangular, and the long sides of the battery string 400 are parallel to the long sides of the battery pieces 100. Meanwhile, the solar cell module is also generally rectangular. When the cell string 400 is disposed, the long side of the cell string 400 may be parallel to the long side of the solar cell module, and the long side of the cell string 400 may also be parallel to the short side of the solar cell module. The specific arrangement of the cell strings 400 in the solar cell module is not particularly limited in the embodiments of the present invention.
In the embodiment of the invention, since the second front main gate line 103 and the second back main gate line 104 are much wider than the front sub-gate line 201 and the back sub-gate line 202, and the resistance values of the second front main gate line 103 and the second back main gate line 104 are few, the conductive resistance between the two battery slices 100 can be effectively reduced by connecting the two battery slices 100 in series with the second front main gate line 103 and the second back main gate line 104 respectively located on the two battery slices 100, so that the current loss between the battery slices 100 is reduced, and the conversion efficiency of the battery slices 100 is increased.
The embodiments are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same or similar parts among the embodiments are referred to each other.
The solar cell module provided by the invention is described in detail above. The principles and embodiments of the present invention are explained herein using specific examples, which are presented only to assist in understanding the method and its core concepts. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
Claims (9)
1. A solar cell module, characterized in that the solar cell module comprises at least one cell string, wherein the cell string comprises at least two cell sheets;
the battery piece comprises a long edge and a short edge, and at least one first front main grid line and a plurality of front auxiliary grid lines intersecting with the first front main grid line are arranged on the light receiving side of the battery piece;
the backlight side of the battery piece is provided with at least one first back main grid line and a plurality of back auxiliary grid lines intersected with the first back main grid line;
the surface of any short side part on the light receiving side of the battery piece is in overlapped contact with the surface of the other short side part on the backlight side of the battery piece adjacent to the long side direction of the battery piece so as to form the battery string in series, and the short side part is an area with the distance from the short side of the battery piece within a preset range;
the long edge of the battery piece is a cutting surface, and the short edge of the battery piece is a non-cutting surface;
a second front main grid line intersecting the first front main grid line is arranged on the surface of any short side part in the light receiving side of the cell, and a second back main grid line intersecting the first back main grid line is arranged on the surface of the other short side part in the back light side of the cell;
and the second back main grid line of the battery piece is contacted with the second front main grid line of the adjacent battery piece along the long edge direction of the battery piece so as to form the battery string.
2. The solar cell module according to claim 1, wherein the length of the short side portion in the direction parallel to the long side of the cell sheet has a range of values: 1.5mm to 3mm, inclusive.
3. The solar cell module of claim 1, wherein the first front side busbar and the first back side busbar are parallel to a long side of the cell sheet.
4. The solar cell module as claimed in claim 3, wherein the first front side busbar has equal distance to the two long sides of the cell, and the first back side busbar has equal distance to the two long sides of the cell.
5. The solar cell assembly of claim 4, wherein the front side gridlines and the back side gridlines are both parallel to the short sides of the cell sheet.
6. The solar cell module as claimed in claim 5, wherein the distance between any two adjacent front side subgrid is equal;
and the distances between any two adjacent back side auxiliary grid lines are equal.
7. The solar cell module of claim 6, wherein the width of the first front side busbar line ranges from: 0.3mm to 1.2mm, inclusive;
the width of the first back main grid line has a value range as follows: 0.3mm to 1.2mm, inclusive.
8. The solar cell module as claimed in claim 1, wherein the second front side busbar is attached to any short side of the cell sheet;
and the second back main grid line is attached to the other short side of the battery piece.
9. The solar cell module as claimed in claim 1, wherein the solar cell comprises a plurality of the cell strings, and any two of the cell strings are connected in parallel or in series.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711044637.0A CN109728107B (en) | 2017-10-31 | 2017-10-31 | Solar cell module |
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| CN201711044637.0A CN109728107B (en) | 2017-10-31 | 2017-10-31 | Solar cell module |
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| CN109728107B true CN109728107B (en) | 2021-01-08 |
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| JP5031937B2 (en) * | 2010-09-29 | 2012-09-26 | 京セラ株式会社 | Solar cell module and manufacturing method thereof |
| CN105917472B (en) * | 2014-01-13 | 2018-11-09 | 光城公司 | High-efficiency solar panel |
| CN104600141B (en) * | 2015-02-06 | 2018-04-03 | 协鑫集成科技股份有限公司 | Solar cell module |
| CN106920854B (en) * | 2017-04-20 | 2018-07-31 | 泰州中来光电科技有限公司 | A kind of densely arranged solar cell string and preparation method and its component, system |
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