CN114361266B - Photovoltaic module - Google Patents
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- CN114361266B CN114361266B CN202011042043.8A CN202011042043A CN114361266B CN 114361266 B CN114361266 B CN 114361266B CN 202011042043 A CN202011042043 A CN 202011042043A CN 114361266 B CN114361266 B CN 114361266B
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- 238000000034 method Methods 0.000 claims abstract description 25
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 6
- 229910021389 graphene Inorganic materials 0.000 claims description 6
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims description 3
- 229910052698 phosphorus Inorganic materials 0.000 claims description 3
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- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 6
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- 229910000838 Al alloy Inorganic materials 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
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Classifications
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- 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
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
Abstract
The invention discloses a photovoltaic module, which comprises: the solar cell comprises a plurality of cell pieces, wherein a plurality of grid lines are arranged on each cell piece at intervals, a plurality of doping areas are arranged in each cell piece at intervals, the doping areas are distributed at intervals along the length direction of the grid lines, each doping area extends along the distribution direction of the grid lines, the doping concentration of each doping area is C, and the C is as follows: c > 4×10 20 cm ‑3 The method comprises the steps of carrying out a first treatment on the surface of the The solar cell comprises a plurality of interconnection structural members, wherein two adjacent cell pieces are a first cell piece and a second cell piece respectively, the first cell piece is connected with the second cell piece through the interconnection structural members, and a plurality of grid lines of the first cell piece are electrically connected with a plurality of grid lines of the second cell piece through at least one interconnection structural member. According to the photovoltaic module, the output power and the reliability of the photovoltaic module can be effectively improved, and the cost can be reduced.
Description
Technical Field
The invention relates to the technical field of photovoltaic power generation, in particular to a photovoltaic module.
Background
In the related art, under the background of increasingly serious energy crisis and environmental pollution, photovoltaic power generation is increasingly favored by various national governments as green and environment-friendly renewable energy. The photovoltaic module is a core part of a photovoltaic power generation system, and the output power of the photovoltaic module is the capability of the photovoltaic module for converting solar energy into electric energy. However, the output power of the photovoltaic module is generally low and the reliability is low.
Disclosure of Invention
The present invention aims to solve at least one of the technical problems existing in the prior art. Therefore, an object of the present invention is to provide a photovoltaic module having high output power and reliability and low cost.
According to an embodiment of the invention, a photovoltaic module includes: the solar cell comprises a plurality of cell pieces, wherein a plurality of grid lines are arranged on each cell piece at intervals, a plurality of doping areas are arranged in each cell piece at intervals, the doping areas are distributed at intervals along the length direction of the grid lines, each doping area extends along the direction perpendicular to the grid lines, the doping concentration of each doping area is C, and the C is as follows: c > 4×10 20 cm -3 The method comprises the steps of carrying out a first treatment on the surface of the The solar cell comprises a plurality of interconnection structural members, wherein two adjacent cell pieces are a first cell piece and a second cell piece respectively, the first cell piece is connected with the second cell piece through the interconnection structural members, and a plurality of grid lines of the first cell piece are electrically connected with a plurality of grid lines of the second cell piece through at least one interconnection structural member.
According to the photovoltaic module of the embodiment of the present invention,by arranging a plurality of grid lines which are spaced apart from each other on each cell sheet, and arranging a plurality of doping regions which are arranged at intervals along the length direction of the grid lines and extend along the direction perpendicular to the grid lines in each cell sheet, the doping concentration C of each doping region satisfies C > 4 multiplied by 10 20 cm -3 On one hand, the doped region can effectively collect current generated by the battery piece and can transmit the current generated by the battery piece to the grid lines; on the other hand, the shielding area of the battery piece can be reduced through the grid lines and the doped regions, so that the output power and the reliability of the photovoltaic module can be effectively improved, and the cost can be reduced.
According to some embodiments of the invention, each of the doped regions is a graphene doped region or a phosphorus doped region.
According to some embodiments of the invention, a minimum distance between each doped region and the corresponding front surface of the battery piece is d, wherein d satisfies: d is more than or equal to 3 mu m and less than or equal to 5 mu m.
According to some embodiments of the invention, each of the doped regions has a thickness t 1 Wherein said t 1 The method meets the following conditions: t is more than or equal to 8 mu m 1 ≤12μm。
According to some embodiments of the invention, each of the doped regions has a width w 1 Wherein the w 1 The method meets the following conditions: w is less than or equal to 60 mu m 1 ≤70μm。
According to some embodiments of the invention, the plurality of interconnection structures includes a plurality of first interconnection structures, the plurality of grid lines on the front surface of the first battery piece and the plurality of grid lines on the back surface of the second battery piece are electrically connected through the plurality of first interconnection structures, the plurality of first interconnection structures are in one-to-one correspondence with the plurality of grid lines, one end of each first interconnection structure is electrically connected with an end of the corresponding grid line on the front surface of the first battery piece, and the other end of each first interconnection structure is electrically connected with the corresponding grid line on the back surface of the second battery piece.
According to some embodiments of the invention, the plurality of interconnect structures comprises a plurality of second interconnect structures, all of the grid lines of the front side of the first cell and all of the grid lines of the back side of the second cell are electrically connected by one of the second interconnect structures, and one end of the second interconnect structure is electrically connected with an end of all of the grid lines of the front side of the first cell.
According to some embodiments of the invention, a connection length of each of the interconnection structures to the front surface of the first battery piece along the length direction of the grid line is L 1 Each interconnection structure member has a connection length L with the back surface of the second battery piece 2 Wherein the L 1 、L 2 The method meets the following conditions: l is less than or equal to 3mm 1 ≤5mm，L 2 ≥3mm。
According to some embodiments of the invention, each of the interconnecting structural members is rectangular in cross-sectional shape.
According to some embodiments of the invention, each of the interconnecting structures has a thickness t 2 Wherein said t 2 The method meets the following conditions: t is less than or equal to 0.1mm 2 ≤0.26mm。
According to some embodiments of the invention, the number of the grid lines on each battery piece is N, wherein N satisfies: n is more than or equal to 9 and less than or equal to 18.
According to some embodiments of the invention, the width of each gate line is w 2 Wherein the w 2 The method meets the following conditions: w is not less than 0.1mm 2 ≤0.2mm。
According to some embodiments of the invention, the first and second battery pieces lie in the same plane or are end-lap.
According to some embodiments of the invention, when the first and second battery pieces are located in the same plane, a gap between the first and second battery pieces is s, wherein s satisfies: s is more than or equal to 0.5mm and less than or equal to 2.5mm; when the first battery piece and the second battery piece are overlapped, the width of the overlapped part of the first battery piece and the second battery piece is W 3 Wherein the W is 3 The method meets the following conditions: w is more than or equal to 0.5mm 3 ≤1.8mm。
According to some embodiments of the invention, each of the battery pieces is formed by cutting a complete battery piece along an arrangement direction of a plurality of grid lines, and a ratio of a width of the battery piece to a width of the complete battery piece is X, wherein the X satisfies: x is more than or equal to 1/6 and less than or equal to 1.
Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
The foregoing and/or additional aspects and advantages of the invention will become apparent and may be better understood from the following description of embodiments taken in conjunction with the accompanying drawings in which:
fig. 1 is a schematic connection diagram of two adjacent cells of a photovoltaic module according to an embodiment of the present invention;
fig. 2 is a schematic connection diagram of two adjacent cells of a photovoltaic module according to another embodiment of the present invention;
FIG. 3 is a partial schematic view of a cell of a photovoltaic module according to an embodiment of the present invention;
fig. 4 is a schematic partial cross-sectional view of a cell of a photovoltaic module according to an embodiment of the present invention.
Reference numerals:
1: a battery sheet; 11: a gate line; 12: a doped region; 2: interconnecting structural members;
21: a first interconnecting structural member; 22: the second interconnecting structure.
Detailed Description
Embodiments of the present invention will be described in detail below, by way of example with reference to the accompanying drawings.
A photovoltaic module according to an embodiment of the present invention is described below with reference to fig. 1 to 4.
As shown in fig. 1 and 2, a photovoltaic module according to an embodiment of the present invention includes a plurality of cell sheets 1 and a plurality of interconnection structures 2. In the description of the present invention, "plurality" means two or more.
Specifically, each cell 1 is provided with a plurality of gate lines 11 arranged at intervals, and each cell 1 is internally provided with a plurality of doping regions 12 arranged at intervals, and a plurality of doping regionsThe regions 12 are arranged at intervals along the length direction of the gate lines 11, and each doped region 12 extends along the direction perpendicular to the plurality of gate lines 11, and the doping concentration of each doped region 12 is C, where C satisfies: c > 4×10 20 cm -3 . Specifically, for example, when C.ltoreq.4X10 20 cm -3 In this case, the doping concentration of the doped region 12 is too small to effectively collect the cells generated by the photovoltaic effect of the cell sheet 1 and transmit the cells to the plurality of grid lines 11, thereby affecting the output power of the photovoltaic module. Thus, by making the doping concentration C of each doped region 12 satisfy: c > 4×10 20 cm -3 The doping concentration of the doping region 12 is higher, so that the current generated by the battery piece 1 can be effectively collected, the current generated by the battery piece 1 can be transmitted to the grid lines 11, and the output power and reliability of the photovoltaic module are improved. In addition, the battery piece 1 is only provided with a plurality of grid lines 11 which are arranged at intervals along the same direction, and no auxiliary grid line is arranged in the direction perpendicular to the plurality of grid lines 11, so that the shielding of the grid lines on the effective area of the battery piece 1 can be reduced, the output power of the photovoltaic module can be further improved, and the material cost can be reduced. Alternatively, each gate line 11 may be made of silver paste or graphene. But is not limited thereto.
The adjacent two battery pieces 1 are respectively a first battery piece and a second battery piece, the first battery piece is connected with the second battery piece through an interconnection structural member 2, and a plurality of grid lines 11 of the first battery piece are electrically connected with a plurality of grid lines 11 of the second battery piece through at least one interconnection structural member 2. Thus, by providing the above-described interconnection structure 2, the current collected by the plurality of grid lines 11 can be transmitted to the interconnection structure 2, so that the series connection between the adjacent two battery pieces 1 can be achieved. Wherein the interconnecting structure 2 may be a piece of flexible metallic material. It should be noted that the term "flexible metal material" as used herein is to be understood in a broad sense, and refers to a metal material having a relatively better ability to respond to deformation, such as copper, aluminum, or the like, as compared to the term "rigid metal material".
According to the photovoltaic module of the embodiment of the present invention, by providing a plurality of grid lines 11 spaced apart from each other on each cell sheet 1 and providing a length direction along the grid lines 11 in each cell sheet 1A plurality of doped regions 12 arranged at intervals and extending in a direction perpendicular to the plurality of gate lines 11, and a doping concentration C of each doped region 12 satisfying C > 4×10 20 cm -3 On the one hand, the doped region 12 can effectively collect the current generated by the cell 1, and can transfer the current generated by the cell 1 to the grid lines 11; on the other hand, the plurality of grid lines 11 and the plurality of doped regions 12 which are arranged in this way are not provided with auxiliary grid lines, compared with a conventional battery, the shielding area of the battery piece 1 can be reduced, so that the output power and the reliability of the photovoltaic module can be effectively improved, and the cost can be reduced.
In some alternative embodiments of the present invention, each doped region 12 may be a graphene doped region. For example, the graphene doped regions may be formed by laser doping. Therefore, as the graphene has excellent conductivity, the resistance can be reduced, the current density can be improved, the current generated by the battery piece 1 through the photovoltaic effect can be better transmitted to the grid lines 11, and the output power and the reliability of the photovoltaic module can be further ensured. Of course, the invention is not limited thereto and in other embodiments of the invention, each doped region 12 may also be a phosphorus doped region. It will be appreciated that the doping material of each doped region 12 may be specifically determined according to the actual requirements to better satisfy the actual application.
In some embodiments of the present invention, the minimum distance between each doped region 12 and the front surface (i.e., the upper surface of the light receiving surface) of the corresponding battery sheet 1 is d, where d satisfies: d is more than or equal to 3 mu m and less than or equal to 5 mu m. Thus, by letting d satisfy: d is more than or equal to 3 mu m and less than or equal to 5 mu m, and the minimum distance between the doped region 12 and the front surface of the battery piece 1 is more reasonable, so that the current can be better collected and transferred to the grid lines 11, and the photovoltaic module is ensured to have higher output power.
In some alternative embodiments of the present invention, each doped region 12 has a thickness t 1 Wherein t is 1 The method meets the following conditions: t is more than or equal to 8 mu m 1 And is less than or equal to 12 mu m. Specifically, for example, when t 1 When the thickness of each doped region 12 is less than 8 μm, the current of the battery plate 1 cannot be effectively collected and transferred to the plurality of grid lines 11, so that the output of the current may be affected; when t 1 At > 12 μm, the thickness of each doped region 12 is excessive, thereby increasing the cost of the material for the entire photovoltaic module. Thus, by letting t 1 The method meets the following conditions: t is more than or equal to 8 mu m 1 The thickness of each doped region 12 is less than or equal to 12 mu m, and the doped regions 12 are ensured to have higher current collection and current transmission capacities, so that the cost can be further reduced while the photovoltaic module is ensured to have higher output power. In addition, the doped region 12 arranged in this way can increase the illumination area of the front surface of the battery piece 1, improve the current collection capability, reduce the resistance, improve the current and the power of the photovoltaic module, and can avoid arranging auxiliary grid lines, thereby saving the use amount of silver paste and reducing the cost.
In some alternative embodiments of the present invention, each doped region 12 has a width w 1 Wherein w is 1 The method meets the following conditions: w is less than or equal to 60 mu m 1 And is less than or equal to 70 mu m. For example, when w 1 When the width of each doped region 12 is smaller than 60 μm, the current of the battery piece 1 cannot be effectively collected and transferred to the grid lines 11, so that the output of the current can be influenced; when w is 1 At > 70 μm, the width of each doped region 12 is too large, which can increase the cost of the material for the entire photovoltaic module. Thus, by making w 1 The method meets the following conditions: w is less than or equal to 60 mu m 1 The width of each doped region 12 is reasonable and is less than or equal to 70 mu m, so that the doped regions 12 have higher current collecting capacity and current conducting capacity, and the cost of the photovoltaic module can be effectively reduced while the output power of the photovoltaic module is ensured. In addition, the doped region 12 arranged in this way can also increase the illumination area of the front surface of the battery piece 1, improve the current collection capability, reduce the resistance, improve the current and the power of the photovoltaic module, and enable the photovoltaic module to be free from arranging auxiliary grid lines, thereby saving the use amount of silver paste and reducing the cost.
In some embodiments of the present invention, referring to fig. 1, the plurality of interconnection structures 2 includes a plurality of first interconnection structures 21, the plurality of grid lines 11 on the front side of the first battery sheet and the plurality of grid lines 11 on the back side of the second battery sheet are electrically connected through the plurality of first interconnection structures 21, and the plurality of first interconnection structures 21 are in one-to-one correspondence with the plurality of grid lines 11, one end of each first interconnection structure 21 is electrically connected with an end of the corresponding grid line 11 on the front side of the first battery sheet, and the other end of each first interconnection structure 21 is electrically connected with the corresponding grid line 11 on the back side of the second battery sheet.
For example, in the example of fig. 1, nine grid lines 11 are provided on each of the battery pieces 1 at regular intervals in the longitudinal direction of the battery piece 1, the nine grid lines 11 are parallel to each other, and each grid line 11 extends in the width direction of the battery piece 1. The number of the first interconnecting structural members 21 between the first battery piece and the second battery piece is also nine, the nine first interconnecting structural members 21 are arranged at intervals along the arrangement direction of the nine grid lines 11, and each first interconnecting structural member 21 extends along the length direction of the grid line 11. Since the doped region 12 can effectively collect and transfer current to the grid line 11, the first interconnect structure 21 need only be connected to the end of the grid line 11 corresponding to the front side of the first cell. Therefore, by arranging the plurality of first interconnection structural members 21, the connection length between the plurality of first interconnection structural members 21 and the front face of the battery piece 1 is shorter, compared with the existing photovoltaic module, the shielding area of the front face of the battery piece 1 can be effectively reduced, the resistance can be reduced, and therefore the output power of the photovoltaic module can be further improved. Moreover, by the arrangement, the first interconnection structural member 21 and the grid lines 11 on the front face of the first battery piece can be prevented from being welded, and the material consumption of the first interconnection structural member 21 is small, so that the cost of the photovoltaic module can be further reduced.
Nine grid lines 11 and nine first interconnecting structures 21 are shown in fig. 1 for illustrative purposes, but it will be apparent to one of ordinary skill in the art after reading the teachings of this application that the teachings apply to other numbers of grid lines 11 and first interconnecting structures 21 and remain within the scope of this invention.
In other embodiments of the present invention, in combination with fig. 2, the plurality of interconnection structures 2 includes a plurality of second interconnection structures 22, all the grid lines 11 on the front side of the first cell and all the grid lines 11 on the back side of the second cell are electrically connected through one second interconnection structure 22, and one end of the second interconnection structure 22 is electrically connected with the end of all the grid lines 11 on the front side of the first cell. For example, in the example of fig. 2, nine grid lines 11 are provided on each of the battery pieces 1 at regular intervals in the longitudinal direction of the battery piece 1 and are parallel to each other, the second interconnection structure 22 extends in the arrangement direction of the nine grid lines 11, and the second interconnection structure 22 is perpendicular to the nine grid lines 11. One side surface of the second interconnection structure 22 is electrically connected with the end parts of nine grid lines 11 on the front surface of the first battery piece, and the other side surface of the second interconnection structure 22 is electrically connected with all grid lines 11 on the back surface of the second battery piece, so that series connection between the first battery piece and the second battery piece is realized. Therefore, by arranging the second interconnection structural member 22, the connection length between the second interconnection structural member 22 and the front face of the battery piece 1 is also shorter, so that the shielding area of the front face of the battery piece 1 can be effectively reduced, the resistance is reduced, the output power of the photovoltaic module is improved, and the second interconnection structural member 22 is also less in material consumption, so that the cost of the photovoltaic module can be reduced. In addition, the second interconnection structural member 22 arranged in this way can be electrically connected with all the grid lines 11 of the corresponding battery piece 1 at the same time, and the structure is simple, so that the processing efficiency of the photovoltaic module can be effectively improved.
In some embodiments of the present invention, the connection length between each interconnection structure 2 and the front surface of the first battery piece along the length direction of the grid line 11 is L 1 Each interconnection structure 2 has a connection length L with the back of the second battery piece 2 Wherein L is 1 、L 2 The method meets the following conditions: l is less than or equal to 3mm 1 ≤5mm，L 2 And is more than or equal to 3mm. Specifically, for example, when L 1 When the length of the connection between each interconnection structural member 2 and the front surface of the first battery piece is less than 3mm, the connection length is too short, and the virtual welding can be caused to influence the welding firmness; when L 1 When the length of the connection between each interconnection structural member 2 and the front surface of the first battery piece is larger than 5mm, so that the shielding area of the front surface of the first battery piece can be increased, and the current conversion efficiency of the first battery piece is affected. Similarly, when L 2 At < 3mm, the connection length of each interconnect structure 2 to the back of the second battery cell is too short, which may result in a cold joint and poor reliability. Thus, by making L 1 、L 2 The method meets the following conditions: l is less than or equal to 3mm 1 ≤5mm，L 2 Not less than 3mm, ensuring the firmness between the interconnection structural member 2 and the first battery piece and the second battery pieceAnd when the photovoltaic module is connected, the shielding area on the front surface of the first battery can be effectively reduced, the current conversion efficiency of the first battery piece is improved, and the output power of the photovoltaic module is further improved.
Alternatively, each of the interconnecting structural members 2 may have a rectangular cross-sectional shape. By the arrangement, the thickness of each interconnection structural member 2 is thinner, and when the interconnection structural members 2 are welded with the grid lines 11 of the battery piece 1, the hidden cracking risk of the battery piece 1 can be effectively reduced, so that the output power and the reliability of the photovoltaic module can be improved, and the service life of the photovoltaic module can be prolonged. Moreover, the welding area of the interconnection structural member 2 and the battery piece 1 is larger, so that the welding tension can be improved, the welding firmness of the interconnection structural member 2 and the battery piece 1 is ensured, and the occurrence of cold joint is avoided.
Optionally, each interconnecting structure 2 has a thickness t 2 Wherein t is 2 The method meets the following conditions: t is less than or equal to 0.1mm 2 Less than or equal to 0.26mm. Like this, the thickness of every interconnection structure 2 is comparatively reasonable, when guaranteeing to be connected firmly with a plurality of bars 11 on the battery piece 1, can effectively reduce the hidden risk of splitting of battery piece 1 to can further improve photovoltaic module's long-term reliability.
In some embodiments of the present invention, the number of the grid lines 11 on each battery sheet 1 is N, where N satisfies: n is more than or equal to 9 and less than or equal to 18. Specifically, for example, when N < 9, the number of the grid lines 11 on each of the battery pieces 1 is too small, the current generated by the battery pieces 1 through the photovoltaic effect may not be effectively guided, and the connection between the interconnection structure 2 and the battery pieces 1 may be affected; when N > 18, the number of the grid lines 11 on each battery piece 1 is excessive, which may result in an excessively large shielding area for the battery piece 1 and increase the use amount of silver paste, thereby increasing the cost. Thus, by letting N satisfy: n is more than or equal to 9 and less than or equal to 18, the grid lines 11 can effectively guide current generated by the battery piece 1, shielding of the battery piece 1 can be reduced, and the photovoltaic module is guaranteed to have higher output power.
In some alternative embodiments of the present invention, each gate line 11 has a width w 2 Wherein w is 2 The method meets the following conditions: w is not less than 0.1mm 2 Less than or equal to 0.2mm. For example, when w 2 When the thickness of the material is less than 0.1mm,the width of each gate line 11 is too small, which may affect the collection of current, and thus may not be able to effectively transfer the current collected by the doped region 12 to the interconnect structure 2, affecting the derivation of current; when w is 2 When the width of each grid line 11 is larger than 0.2mm, the use amount of silver paste can be increased, so that the cost of the battery piece 1 is increased, the shielding area of the battery piece 1 can be increased, and the output power of the photovoltaic module can be possibly influenced. Thus, by making w 2 The method meets the following conditions: w is not less than 0.1mm 2 And less than or equal to 0.2mm, the amount of silver paste used can be reduced while ensuring that the plurality of grid lines 11 can effectively conduct current collected by the doped regions 12 to the interconnection structural member 2, so that the cost can be reduced. Furthermore, the shielding area of the battery piece 1 can be reduced, thereby improving the output power of the photovoltaic module.
In some alternative embodiments of the present invention, the first and second battery plates may lie in the same plane as shown in fig. 1 and 2. So set up, photovoltaic module is the photovoltaic module of piece mode, compares with conventional photovoltaic module, can reduce photovoltaic module's minor face size, can reduce the difficulty of glass process when the size of battery piece 1 is great, reduces photovoltaic module load and takes off the risk of frame.
Further, when the first battery piece and the second battery piece are located in the same plane, a gap between the first battery piece and the second battery piece is s, wherein s satisfies: s is more than or equal to 0.5mm and less than or equal to 2.5mm. Specifically, for example, when s < 0.5mm, the gap between two adjacent battery pieces 1 is too small, which may result in a high breakage rate of the battery pieces 1, lower the reliability of the photovoltaic module, and be unfavorable for heat dissipation of the battery pieces 1; when s is more than 2.5mm, the gap between two adjacent battery pieces 1 is too large, so that the power density of the unit area of the photovoltaic module can be reduced, the size of the photovoltaic module is too large, and the packaging efficiency of the photovoltaic module can be reduced. Thus, by letting s satisfy: s is more than or equal to 0.5mm and less than or equal to 2.5mm, so that the structure of the photovoltaic module is more compact, the power density of the unit area of the photovoltaic module and the packaging efficiency of the photovoltaic module can be improved, and the reliability of the photovoltaic module is higher. For example, s may be 0.5mm. Therefore, the solar light transmittance between two adjacent battery pieces 1 can be increased, the heat dissipation effect of the battery pieces 1 can be improved, the temperature of the photovoltaic module is reduced, and the photovoltaic module is ensured to have higher output power.
Of course, the invention is not so limited, and in other embodiments of the invention the first and second battery tab ends overlap (not shown). Therefore, through the arrangement, more battery pieces 1 can be stacked in a unit area, and the power generation and stability of the photovoltaic module are improved. Moreover, by such arrangement, the size of the photovoltaic module can be further reduced.
In a further embodiment of the present invention, when the first and second battery cell ends overlap, the width of the first and second battery cell end overlap portion is W 3 Wherein W is 3 The method meets the following conditions: w is more than or equal to 0.5mm 3 Less than or equal to 1.8mm. Therefore, shielding between two adjacent battery pieces 1 can be reduced while the density of the battery pieces 1 of the photovoltaic module is improved, so that the light utilization rate of the battery pieces 1 can be improved.
In some embodiments of the present invention, each of the battery pieces 1 is formed by cutting a complete battery piece along the arrangement direction of the plurality of grid lines 11, and the ratio of the width of the battery piece 1 to the width of the complete battery piece is X, where X satisfies: x is more than or equal to 1/6 and less than or equal to 1. For example, the number of the grid lines 11 on each cut battery piece 1 is equal to the number of the grid lines 11 of the whole battery piece (for example, nine) by equally dividing the whole battery piece by 1 to 6 (including the end point value) along the direction perpendicular to the grid lines 11 in a laser scribing manner. When the complete battery piece is square, the ratio of the width of the battery piece 1 to the width of the complete battery piece is the ratio of the width of the cut battery piece 1 to the length, for example, may be 1: 2. 1: 3. 1: 4. 1:5 or 1:6, etc. Therefore, the internal current of the photovoltaic module can be effectively reduced by slicing the complete battery piece, so that lower power loss can be brought, and the cost of a single watt is reduced.
Alternatively, the photovoltaic module may include a front transparent plate, a front encapsulant film, a solar cell module, a back encapsulant film, and a back cover plate. Wherein the solar cell module comprises a plurality of cell sheets 1. When the photovoltaic module is manufactured, the front transparent plate, the front packaging adhesive film, the solar cell module, the back packaging adhesive film and the back cover plate are placed in sequence, so that preparation work before lamination of the photovoltaic module is completed. And then carrying out vacuumizing, heating and laminating on the laminated five-layer structure comprising the front transparent plate, the front packaging adhesive film, the solar cell module, the back packaging adhesive film and the back cover plate, and then enabling the front packaging adhesive film and the back packaging adhesive film to be crosslinked and cured so as to protect the solar cell module, finally realizing firm bonding of the five-layer structure (namely the front transparent plate, the front packaging adhesive film, the solar cell module, the back packaging adhesive film and the back cover plate), and completing manufacturing of the photovoltaic module after adding an aluminum alloy frame, a junction box and sealing by adopting silica gel.
Other constructions and operations of photovoltaic modules according to embodiments of the present invention are known to those of ordinary skill in the art and will not be described in detail herein.
In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present invention and to simplify the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present invention.
In the description of the invention, a "first feature" or "second feature" may include one or more of such features.
In the description of the present specification, reference to the terms "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples.
While embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that: many changes, modifications, substitutions and variations may be made to the embodiments without departing from the spirit and principles of the invention, the scope of which is defined by the claims and their equivalents.
Claims (11)
1. A photovoltaic module, comprising:
the solar cell comprises a plurality of cell pieces, wherein a plurality of grid lines are arranged on each cell piece at intervals, a plurality of doping areas are arranged in each cell piece at intervals, the doping areas are distributed at intervals along the length direction of the grid lines, each doping area extends along the direction perpendicular to the grid lines, the doping concentration of each doping area is C, and the C is as follows: c > 4×10 20 cm -3 ；
The solar cell comprises a plurality of interconnection structural members, wherein two adjacent cells are respectively a first cell and a second cell, the first cell and the second cell are connected through the interconnection structural members, and a plurality of grid lines of the first cell and a plurality of grid lines of the second cell are electrically connected through at least one interconnection structural member;
each doped region is a graphene doped region or a phosphorus doped region; the minimum distance between each doped region and the corresponding front surface of the battery piece is d, wherein d satisfies the following conditions: d is more than or equal to 3 mu m and less than or equal to 5 mu m; each of the doped regions has a thickness t 1 Wherein said t 1 The method meets the following conditions: t is more than or equal to 8 mu m 1 Less than or equal to 12 mu m; the width of each doped region is w 1 Wherein the w 1 The method meets the following conditions: w is less than or equal to 60 mu m 1 ≤70μm。
2. The photovoltaic module according to any one of claim 1, wherein the plurality of interconnection structures includes a plurality of first interconnection structures, the plurality of grid lines on the front side of the first cell and the plurality of grid lines on the back side of the second cell are electrically connected through the plurality of first interconnection structures, and the plurality of first interconnection structures are in one-to-one correspondence with the plurality of grid lines, one end of each first interconnection structure is electrically connected to an end of the grid line corresponding to the front side of the first cell, and the other end of each first interconnection structure is electrically connected to the grid line corresponding to the back side of the second cell.
3. The photovoltaic module of any of claims 1, wherein the plurality of interconnect structures comprises a plurality of second interconnect structures, all of the grid lines of the first cell front side and all of the grid lines of the second cell back side being electrically connected by one of the second interconnect structures, one end of the second interconnect structure being electrically connected with an end of all of the grid lines of the first cell front side.
4. The photovoltaic module of claim 1, wherein a length of connection of each of the interconnect structures to the front side of the first cell sheet along the length of the grid line is L 1 Each interconnection structure member has a connection length L with the back surface of the second battery piece 2 Wherein the L 1 、L 2 The method meets the following conditions: l is less than or equal to 3mm 1 ≤5mm，L 2 ≥3mm。
5. The photovoltaic assembly of any of claims 1, wherein each of the interconnecting structural members is rectangular in cross-sectional shape.
6. The photovoltaic assembly of any of claims 1, wherein each of the interconnecting structures has a thickness t 2 Wherein said t 2 The method meets the following conditions: t is less than or equal to 0.1mm 2 ≤0.26mm。
7. The photovoltaic module of any of claims 1, wherein the number of grid lines on each of the cells is N, wherein N satisfies: n is more than or equal to 9 and less than or equal to 18.
8. The photovoltaic module of any of claims 1, wherein each of the grid lines has a width w 2 Wherein the w 2 The method meets the following conditions: w is not less than 0.1mm 2 ≤0.2mm。
9. The photovoltaic assembly of any of claims 1, wherein the first and second cells lie in the same plane or are end lap-jointed.
10. The photovoltaic assembly of claim 9, wherein a gap between the first and second cells is s when the first and second cells are in the same plane, wherein s satisfies: s is more than or equal to 0.5mm and less than or equal to 2.5mm;
when the first battery piece and the second battery piece are overlapped, the width of the overlapped part of the first battery piece and the second battery piece is W 3 Wherein the W is 3 The method meets the following conditions: w is more than or equal to 0.5mm 3 ≤1.8mm。
11. The photovoltaic module of any of claims 1, wherein each of the cells is a complete cell cut along the direction of arrangement of the plurality of grid lines, and the ratio of the width of the cell to the width of the complete cell is X, wherein the X satisfies: x is more than or equal to 1/6 and less than or equal to 1.
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