CN215988787U - Solar cell and photovoltaic module - Google Patents
Solar cell and photovoltaic module Download PDFInfo
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- CN215988787U CN215988787U CN202121491135.4U CN202121491135U CN215988787U CN 215988787 U CN215988787 U CN 215988787U CN 202121491135 U CN202121491135 U CN 202121491135U CN 215988787 U CN215988787 U CN 215988787U
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Abstract
The utility model provides a solar cell and a photovoltaic module, which comprise: the backlight module comprises a semiconductor substrate, and a positive electrode, a negative electrode, a first insulating layer and a second insulating layer which are arranged on a backlight surface of the semiconductor substrate. In the utility model, because the anode fine grid electrode in the anode electrode is usually an aluminum electrode, even if the position of the welding strip connected with the anode connecting point in the anode electrode deviates to a certain degree, the welding strip is contacted with the anode fine grid electrode and cannot cause short circuit or weld the anode fine grid electrode, therefore, the first insulating layer arranged between the adjacent anode connecting points can only cover the first end point and a part containing the first end point of the cathode fine grid electrode so as to avoid the short circuit caused by the contact of the welding strip and the anode fine grid electrode, but does not cover the anode fine grid electrode, thereby avoiding the large-area arrangement of the first insulating layer, reducing the area of the first insulating layer and reducing the production cost of the solar cell.
Description
Technical Field
The utility model relates to the technical field of photovoltaics, in particular to a solar cell and a photovoltaic module.
Background
The back contact (IBC) solar cell is a solar cell in which the front surface of a cell does not have an electrode and both positive and negative electrodes are disposed on the back surface of the cell, so that the shielding of the electrode on the cell can be reduced, the short-circuit current of the cell can be increased, and the energy conversion efficiency of the cell can be improved.
In the existing back contact solar cell, a positive electrode on the back of the cell comprises a positive main grid and a positive auxiliary grid, a negative electrode comprises a negative main grid and a negative fine grid, the positive main grid and the negative main grid are arranged in parallel, the positive fine grid and the negative fine grid are arranged in a finger-like cross manner, the main grids and the fine grids with the same polarity are connected with each other, and the main grids and the fine grids with different polarities are isolated from each other, so that short circuit is avoided. When the back contact solar cell is used for assembling to obtain a photovoltaic module, a solder strip is often used to connect adjacent cells, one end of the solder strip is connected with a part of the positive main grid on the back of the cell and extends to the negative main grid on the back of the adjacent cell along the positive main grid, and the other end of the solder strip is connected with a part of the negative main grid, so that the current collected by the positive main grid and the negative main grid is conducted, and two adjacent back contact solar cells are connected in series. Meanwhile, in order to prevent the short circuit between the welding strip and the main grid electrode when the welding strip is connected with the main grid electrode in the battery piece and the thin grid electrode with opposite polarity, an insulating layer can be arranged in the battery piece except the position where the main grid electrode is connected with the welding strip, so that the welding strip connected with the main grid electrode cannot be contacted with the thin grid electrode with opposite polarity even if the welding strip is deviated to a certain degree.
However, in the prior art, in order to ensure that the solder ribbon does not contact the fine grid electrode of the opposite polarity even if the solder ribbon is deviated to a certain extent, an insulating layer needs to be provided on the surface of the solar cell in a large area, thereby increasing the production cost of the solar cell.
SUMMERY OF THE UTILITY MODEL
The utility model provides a solar cell and a photovoltaic module, and aims to solve the problem that in the prior art, an insulating layer is arranged to avoid short circuit caused by contact with a fine grid electrode with opposite polarity when a solder strip is deviated to a certain degree, and a large-area insulating layer is required to be arranged, so that the production cost of the solar cell is high.
In a first aspect, an embodiment of the present invention provides a solar cell, where the solar cell includes:
the device comprises a semiconductor substrate, and a positive electrode, a negative electrode, a first insulating layer and a second insulating layer which are arranged on a backlight surface of the semiconductor substrate;
the positive electrode comprises a positive main grid electrode and a positive fine grid electrode, the negative electrode comprises a negative main grid electrode and a negative fine grid electrode, the positive main grid electrode and the negative main grid electrode are parallel to each other along a first direction and are arranged at intervals, and the positive main grid electrode comprises: a plurality of positive electrode connection points for connection with a conductive wire, and a positive electrode connection gate line connecting adjacent ones of the positive electrode connection points, the negative electrode main gate electrode comprising: the negative electrode connecting grid lines are used for connecting the negative electrode connecting points with the conducting wires;
the positive electrode fine grid electrode and the negative electrode fine grid electrode are parallel to each other along a second direction and are arranged at intervals, the positive electrode fine grid electrode is connected with the positive electrode main grid electrode and is separated from the negative electrode main grid electrode by a first preset distance, and the negative electrode fine grid electrode is connected with the negative electrode main grid electrode and is separated from the positive electrode main grid electrode by a second preset distance;
the first insulating layer covers a first end point of the negative fine grid electrode close to the positive electrode connecting grid line, a part including the first end point and does not cover the positive electrode fine grid electrode between the adjacent positive electrode connecting points;
the second insulating layer covers a second end point of the positive fine grid electrode close to the negative connecting grid line and a part containing the second end point.
Optionally, the first insulating layer comprises a first section and a second section;
the first sub portion and the second sub portion are arranged on two opposite sides of the positive electrode connecting grid line, a third preset distance is arranged between the first sub portion and the positive electrode connecting grid line, and a fourth preset distance is arranged between the second sub portion and the positive electrode connecting grid line.
Optionally, the third preset distance is equal to the fourth preset distance;
the third preset distance and the fourth preset distance are 0.01-0.5 mm.
Optionally, the second insulating layer does not cover the negative fine gate electrode between the adjacent negative connection points.
Optionally, the second insulating layer comprises a third subsection and a fourth subsection;
the third subsection and the fourth subsection are arranged on two opposite sides of the negative electrode connecting grid line, a fifth preset distance is arranged between the third subsection and the negative electrode connecting grid line, and a sixth preset distance is arranged between the fourth subsection and the negative electrode connecting grid line.
Optionally, the first insulating layer is disposed on the negative fine grid electrode between the adjacent positive connection points, and the first insulating layer covers only a first end point of the negative fine grid electrode between the adjacent positive connection points and a part including the first end point;
and/or the second insulating layer is arranged on the positive electrode fine grid electrode between the adjacent negative electrode connecting points, and only covers the second end point of the positive electrode fine grid electrode between the adjacent negative electrode connecting points and a part containing the second end point. Optionally, the first insulating layer is disposed between the adjacent negative electrode connection points, and the first insulating layer covers a first end point and a part including the first end point of the negative electrode fine grid electrode between the adjacent positive electrode connection points, and a positive electrode connection grid line between the adjacent positive electrode connection points, and a part of the positive electrode fine grid electrode connected to the positive electrode connection grid line;
and/or the second insulating layer is arranged between the adjacent negative electrode connecting points, the second insulating layer covers the second end point of the positive electrode fine grid electrode between the adjacent negative electrode connecting points and a part containing the second end point, and the negative electrode connecting grid line between the adjacent negative electrode connecting points and a part of the negative electrode fine grid electrode connected with the negative electrode connecting grid line.
Optionally, the first insulating layer is configured to have a rectangular structure, and a dimension of the first insulating layer along the first direction is smaller than a dimension of the first insulating layer along the second direction.
Optionally, a ratio between a dimension of the positive electrode connection point in the second direction and a dimension of the first insulating layer in the second direction is 1:0.6-1: 1.5.
Optionally, the size of the first and second sections along the second direction is larger than the size of the conductive line along the second direction.
In a second aspect, an embodiment of the present invention provides a photovoltaic module, including: a plurality of the above solar cells and a plurality of conductive wires;
one end of the conductive wire is connected with a plurality of positive connection points in the positive electrode of the solar cell, and the other end of the conductive wire is connected with a plurality of negative connection points in the negative electrode of the adjacent solar cell.
The embodiment of the utility model provides a solar cell and a photovoltaic module, which comprise: the semiconductor substrate, positive electrode and negative electrode arranged on the backlight surface of the semiconductor substrate, a first insulating layer and a second insulating layer; the positive electrode includes anodal main grid electrode and anodal thin grid electrode, and the negative electrode includes negative pole main grid electrode and negative pole thin grid electrode, and anodal main grid electrode and negative pole main grid electrode are parallel to each other and the interval sets up along first direction, and anodal main grid electrode includes: a plurality of positive pole tie points for being connected with the conductor wire to and connect the positive pole connecting grid line of adjacent positive pole tie point, negative pole main grid electrode includes: a plurality of negative electrode connection points for connection with the conductive wires, and a negative electrode connection gate line connecting adjacent negative electrode connection points; the positive fine grid electrode and the negative fine grid electrode are parallel to each other and arranged at intervals along a second direction, the positive fine grid electrode is connected with the positive main grid electrode and is separated from the negative main grid electrode by a first preset distance, and the negative fine grid electrode is connected with the negative main grid electrode and is separated from the positive main grid electrode by a second preset distance; the first insulating layer covers the first end point of the negative fine grid electrode close to the positive electrode connecting grid line and the positive fine grid electrode which comprises a part of the first end point and does not cover the space between adjacent positive electrode connecting points; the second insulating layer covers a second end point of the positive fine gate electrode near the negative connection gate line and a portion including the second end point. In the utility model, because the anode fine grid electrode is usually an aluminum electrode, even if the position of the welding strip connected with the anode connecting point deviates to a certain degree, the welding strip is in contact with the anode fine grid electrode and cannot cause short circuit or the welding strip can not weld the anode fine grid electrode, so that the first insulating layer arranged between the adjacent anode connecting points can only cover the first end point of the cathode fine grid electrode and one part containing the first end point, but does not cover the anode fine grid electrode, thereby avoiding the arrangement of the first insulating layer in a large area, reducing the area of the first insulating layer and lowering the production cost of the solar cell.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments of the present invention will be briefly introduced 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 according to these drawings without inventive labor.
Fig. 1 shows a schematic structural diagram of an IBC solar cell in an embodiment of the present invention;
FIG. 2 shows a schematic structural diagram of another IBC solar cell in an embodiment of the utility model;
FIG. 3 shows a schematic structural diagram of a solar cell in an embodiment of the utility model;
FIG. 4 shows a schematic structural diagram of another solar cell in an embodiment of the utility model;
FIG. 5 shows a schematic structural diagram of yet another solar cell in an embodiment of the utility model;
FIG. 6 shows a schematic structural diagram of yet another solar cell in an embodiment of the utility model;
FIG. 7 shows a schematic cross-sectional view of a solar cell in an embodiment of the utility model;
fig. 8 shows a schematic structural diagram of a photovoltaic module in an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, embodiments of the present 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.
The IBC solar cell is one of the technical directions for realizing a high-efficiency crystalline silicon cell at present, and means that the front side of a cell does not have electrodes, and positive and negative electrodes are arranged on the back side of the cell, so that the shielding of the electrodes on the cell can be reduced, the short-circuit current of the cell is increased, and the energy conversion efficiency of the cell is improved.
Referring to fig. 1, fig. 1 shows a schematic structural diagram of an IBC solar cell in an embodiment of the present invention, which includes a semiconductor substrate 10, and a positive electrode 20 and a negative electrode 30 disposed on a backlight surface of the semiconductor substrate 10, where the positive electrode 20 may further include a positive main gate electrode 21 and a positive fine gate electrode 22, the negative electrode 30 may further include a negative main gate electrode 31 and a negative fine gate electrode 32, the positive main gate electrode 21 and the negative main gate electrode 31 are disposed in parallel and spaced with each other along a first direction a, and the positive fine gate electrode 22 and the negative fine gate electrode 32 are disposed in parallel and spaced with each other along a second direction B, that is, the positive fine gate electrode 22 and the negative fine gate electrode 32 are disposed in an interdigitated manner, and the first direction a and the second direction B are not parallel to each other.
Meanwhile, the positive fine gate electrodes 22 are distributed on the surface of the semiconductor substrate 10 and used for collecting the positive charge carriers generated on the surface of the semiconductor substrate 10 and transmitting and converging the collected positive charge carriers to the positive main gate electrode 21, that is, currents are formed and converged in the positive fine gate electrodes 22 and the positive main gate electrode 21; the negative fine grid electrode 32 is distributed on the surface of the semiconductor substrate 10, and is used for collecting negative charge carriers generated on the surface of the semiconductor substrate 10, and transmitting and collecting the collected negative charge carriers to the negative main grid electrode 31, that is, current is formed and collected in the negative fine grid electrode 32 and the negative main grid electrode 31. Therefore, the positive fine grid electrode 22 is connected to the positive main grid electrode 21 and is separated from the negative main grid electrode 31 by a first preset distance, that is, one end C of the positive fine grid electrode 22 is connected to the positive main grid electrode 21, and the other end D (the second end point) is separated from the negative main grid electrode 31 by the first preset distance, so that the connection with the negative main grid electrode 31 is realized, and the short circuit is avoided; the negative fine grid electrode 32 is connected with the negative main grid electrode 31 and is spaced from the positive main grid electrode 21 by a second preset distance, that is, one end E of the negative fine grid electrode 32 is connected with the negative main grid electrode 31, and the other end F (first end point) is spaced from the positive main grid electrode 21 by the second preset distance, so that the negative fine grid electrode is disconnected from the positive main grid electrode 21, and short circuit is avoided.
The first preset distance and the second preset distance may be equal to or different from each other, and the first preset distance and the second preset distance may be a distance between the main gate electrode and the thin gate electrode with opposite polarity when no short circuit occurs.
Further, a plurality of IBC solar cells are interconnected to form a photovoltaic module, so that the current generated and concentrated in the plurality of solar cells is further collected to supply power to an external device.
Specifically, the IBC solar cells are interconnected mainly by means of solder ribbon bonding or conductive backplane connection.
When the conductive backboard and the conductive adhesive are used for realizing conductive interconnection of the IBC solar cell, the conductive backboard is formed by laminating a copper foil layer and a backboard layer which are subjected to patterning treatment, patterning processing of the copper foil is complex, used insulating materials also need to be customized independently, the use of the large-area copper foil layer and the complexity of the process enable the production cost of interconnection of the conductive backboard to be high, and therefore the photovoltaic module cannot be produced in large scale.
However, because the positive electrode 20 and the negative electrode 30 of the IBC solar cell are both disposed on the backlight surface of the cell, the positive electrode 20 includes the positive main grid electrode 21 and the positive fine grid electrode 22, the negative electrode 30 includes the negative main grid electrode 31 and the negative fine grid electrode 32, when the positive main grid electrode 21 or the negative main grid electrode 31 is connected by the solder strip, a slight deviation of the solder strip may cause the solder strip to contact the fine grid electrode with opposite polarity, thereby causing a short circuit, for example, when the positive main grid electrode 21 is connected by the solder strip, if the solder strip is deviated in position, the solder strip may cause the solder strip to contact the negative fine grid electrode 32, thereby further conducting the positive main grid electrode 21 and the negative fine grid electrode 32, because carriers with opposite polarity exist in the positive main grid electrode 21 and the negative fine grid electrode 32, thereby causing a short circuit. Therefore, when the photovoltaic module is formed by interconnecting the IBC solar cells by the solder strips, the positioning precision requirement and the operation requirement on the solder strip welding are high, so that the yield of the prepared photovoltaic module is low.
Referring to fig. 2, fig. 2 shows a schematic structural diagram of another IBC solar cell in an embodiment of the present invention, the solar cell includes: a semiconductor substrate 10, and a positive electrode 20 and a negative electrode 30, and a first insulating layer 40 and a second insulating layer 50, which are disposed on a backlight side of the semiconductor substrate 10.
The positive main gate electrode 21 in the solar cell may include: a plurality of positive electrode connection points 211 for connection with conductive lines, and a positive electrode connection gate line 212 connecting adjacent positive electrode connection points 211; the negative main gate electrode 31 may include: a plurality of negative electrode connection points 311 for connection with the conductive lines, and a negative electrode connection gate line 312 connecting adjacent negative electrode connection points 311. Correspondingly, one end C of the positive fine-gate electrode 22 is connected to the positive connection point 211 or the positive connection gate line 212, and the other end D (the second end point) is spaced from the negative connection point 311 or the negative connection gate line 312 by a first preset distance; one end E of the negative fine gate electrode 32 is connected to the negative connection point 311 or the negative connection gate line 312, and the other end F (first end) is spaced from the positive connection point 211 or the positive connection gate line 212 by a second predetermined distance.
Specifically, when the adjacent solar cells are connected by using the conductive wire (solder ribbon), the positive electrode connection point 211 and the negative electrode connection point 311 may be soldered as a solder ribbon with the solder ribbon extending along the positive electrode main grid electrode 21 and the negative electrode main grid electrode 31.
Further, the first insulating layer 40 covers a portion of the positive fine gate electrode 22, and a first end of the negative fine gate electrode 32 close to the positive connection gate line 212 and a portion including the first end, that is, the first insulating layer 40 covers a portion of the negative fine gate electrode 32 closest to the positive connection gate line 212, wherein the first end is an end F close to the positive connection gate line 212 of the two ends E, F of the negative fine gate electrode 32. Therefore, the first insulating layer 40 can play a role in isolating the negative electrode fine grid electrode 32 from the positive electrode main grid electrode 21, so that when a photovoltaic module is formed by interconnecting solar cells by using solder strips, even if the solder strips arranged at the positions corresponding to the positive electrode main grid electrode 21 and connected with the positive electrode connecting point 211 deviate to a certain extent, the solder strips are not in contact with the negative electrode fine grid electrode 32, and further the positive electrode main grid electrode 21 and the negative electrode fine grid electrode 32 are prevented from being conducted, that is, the first insulating layer 40 can prevent a short circuit from being formed between the positive electrode main grid electrode 21 and the negative electrode fine grid electrode 32, so that the positioning precision and the operation requirement during welding of the solder strips can be reduced, and the yield of the finally prepared photovoltaic module is improved.
Accordingly, the second insulating layer 50 covers a portion of the negative fine gate electrode 32, and a second end of the positive fine gate electrode 22 close to the negative connection gate line 312 and a portion including the second end, that is, the second insulating layer 50 covers a portion of the positive fine gate electrode 22 closest to the negative connection gate line 312, wherein the second end is an end D of the two ends C, D of the positive fine gate electrode 22 close to the negative connection gate line 312. Therefore, the second insulating layer 50 can play a role in isolating the positive electrode fine grid electrode 22 from the negative electrode main grid electrode 31, so that when a photovoltaic module is formed by interconnecting solar cells by using solder strips, even if the solder strips arranged at the positions corresponding to the negative electrode main grid electrode 31 and connected with the negative electrode connecting point 311 deviate to a certain extent, the solder strips cannot be in contact with the positive electrode fine grid electrode 22, and further the negative electrode main grid electrode 31 and the positive electrode fine grid electrode 22 are prevented from being conducted, namely, the second insulating layer 50 can prevent the negative electrode main grid electrode 31 and the positive electrode fine grid electrode 22 from being short-circuited, so that the positioning precision and the operation requirement during solder strip welding can be reduced, and the yield of the finally prepared photovoltaic module is improved.
In the embodiment of the present invention, referring to fig. 2, the first insulating layer 40 may be only disposed between adjacent positive electrode connection points 211, and the second insulating layer 50 may be only disposed between adjacent negative electrode connection points 311, that is, the positions corresponding to the positive electrode connection points 211 and the negative electrode connection points 311 may not be provided with an insulating layer, because the positive electrode connection points 211 and the negative electrode connection points 311 are used as welding points to weld with a welding strip, that is, the connection strength between the positive electrode connection points 211 and the negative electrode connection points 311 and the welding strip is high, and the welding strip at the positive electrode connection points 211 and the negative electrode connection points 311 is not prone to position shift, so that the welding strip is not prone to contact with a fine grid electrode with opposite polarity, and thus, a short circuit can be avoided.
In addition, when the second insulating layer 50 is disposed between the adjacent negative electrode connection points 311, the second insulating layer 50 covers the second end point of the positive electrode fine grid electrode 22 between the adjacent negative electrode connection points 311 and a portion including the second end point, and also covers the negative electrode connection grid line 312 between the adjacent negative electrode connection points 311 and a portion of the negative electrode fine grid electrode 32 connected to the negative electrode connection grid line 312, so that the structure of the second insulating layer 50 between the adjacent negative electrode connection points 311 is an integrated structure, which is beneficial to the process preparation of the second insulating layer 50. Because negative pole tie point 311, negative pole connecting grid line 312 and the thin grid electrode 32 of negative pole all can be the silver electrode that silver thick liquid prepared obtained, the second insulating layer 50 that covers negative pole connecting grid line 312 can avoid welding the area and connect grid line 312 contact with the negative pole to it engulfs and makes negative pole connecting grid line 312 welded the area and weld to break to avoid welding the soldering tin coating on area surface to weld the silver-colored dissolution in negative pole connecting grid line 312, thereby has ensured the reliability that grid line 312 was connected to the negative pole.
Meanwhile, when the first insulating layer 40 is disposed between the adjacent positive electrode connection points 211, the first insulating layer 40 covers the first end point and a part including the first end point of the negative electrode fine gate electrode 32 between the adjacent positive electrode connection points 211, and simultaneously can also cover the positive electrode connection gate line 212 between the adjacent positive electrode connection points 211 and a part connected with the positive electrode connection gate line 212 in the positive electrode fine gate electrode 22, so that the structure of the first insulating layer 40 between the adjacent positive electrode connection points 211 is also an integrated structure, which is beneficial to the process preparation of the first insulating layer 40. Alternatively, referring to fig. 2, the first insulating layer 40 disposed between the adjacent positive electrode connection points 211 is not covered with the positive electrode connection gate line 212, that is, the first insulating layer 40 is symmetrically disposed on both sides of the positive electrode connection gate line 212, but covers the negative electrode fine gate electrode 32 and a portion of the positive electrode fine gate electrode 22 close to the positive electrode connection gate line 212, so that the amount of insulating paste used for preparing the first insulating layer 40 can be reduced.
In the embodiment of the present invention, since the positive fine grid electrode 22 in the solar cell is generally an aluminum electrode prepared by using aluminum paste, and an aluminum oxide layer is generated on the surface of the aluminum electrode and is not welded to the solder strip, even if the solder strip is in contact with the positive fine grid electrode 22 due to a certain deviation of the position of the solder strip connected to the positive connection point 211, a short circuit or a solder strip welding the positive fine grid electrode 22 will not occur, and therefore, the first insulating layer 40 disposed between adjacent positive connection points 211 may only cover a portion of the negative fine grid electrode 32 close to the positive connection grid line 212, but does not cover the positive fine grid electrode 22, and the first insulating layer 40 is prevented from being disposed in a large area, so that the area of the first insulating layer 40 is reduced, and the production cost of the solar cell is reduced.
Referring to fig. 3, fig. 3 shows a schematic structural diagram of a solar cell in an embodiment of the present invention, a first insulating layer 40 covers a first end point of the negative fine gate electrode 32 close to the positive electrode connection gate line 212 and a portion including the first end point, that is, the first insulating layer 40 covers a portion of the negative fine gate electrode 32 closest to the positive electrode connection gate line 212, but does not cover the positive fine gate electrode 22 between adjacent positive electrode connection points 211; the second insulating layer 50 covers the second end point of the positive fine gate electrode 22 near the negative connection gate line 312 and a portion including the second end point, i.e., the second insulating layer 50 covers a portion of the positive fine gate electrode 22 that is most adjacent to the negative connection gate line 312. Therefore, the first insulating layers 40 arranged between the adjacent positive electrode connection points 211 are arranged at intervals along the first direction a, that is, the first insulating layers 40 are arranged at the positions corresponding to the negative fine grid electrodes 32, so as to avoid short circuit caused by contact between the negative fine grid electrodes 32 when the welding strip is deviated, but the first insulating layers 40 are not arranged at the positions corresponding to the positive fine grid electrodes 22, so that the problem that the area of the insulating layers is too large to cause high production cost is avoided.
To sum up, in the embodiment of the present invention, the method includes: the semiconductor substrate, positive electrode and negative electrode arranged on the backlight surface of the semiconductor substrate, a first insulating layer and a second insulating layer; the positive electrode includes anodal main grid electrode and anodal thin grid electrode, and the negative electrode includes negative pole main grid electrode and negative pole thin grid electrode, and anodal main grid electrode and negative pole main grid electrode are parallel to each other and the interval sets up along first direction, and anodal main grid electrode includes: a plurality of positive pole tie points for being connected with the conductor wire to and connect the positive pole connecting grid line of adjacent positive pole tie point, negative pole main grid electrode includes: a plurality of negative electrode connection points for connection with the conductive wires, and a negative electrode connection gate line connecting adjacent negative electrode connection points; the positive fine grid electrode and the negative fine grid electrode are parallel to each other and arranged at intervals along a second direction, the positive fine grid electrode is connected with the positive main grid electrode and is separated from the negative main grid electrode by a first preset distance, and the negative fine grid electrode is connected with the negative main grid electrode and is separated from the positive main grid electrode by a second preset distance; the first insulating layer covers the first end point of the negative fine grid electrode close to the positive electrode connecting grid line and the positive fine grid electrode which comprises a part of the first end point and does not cover the space between adjacent positive electrode connecting points; the second insulating layer covers a second end point of the positive fine gate electrode near the negative connection gate line and a portion including the second end point. In the utility model, because the anode fine grid electrode is usually an aluminum electrode, even if the position of the welding strip connected with the anode connecting point deviates to a certain degree, the welding strip is in contact with the anode fine grid electrode and cannot cause short circuit or the welding strip can not weld the anode fine grid electrode, so that the first insulating layer arranged between the adjacent anode connecting points can only cover the first end point of the cathode fine grid electrode and one part containing the first end point, but does not cover the anode fine grid electrode, thereby avoiding the arrangement of the first insulating layer in a large area, reducing the area of the first insulating layer and lowering the production cost of the solar cell.
Alternatively, referring to fig. 4, fig. 4 shows a schematic structural diagram of another solar cell in an embodiment of the present invention, wherein the first insulating layer 40 may include a first subsection 41 and a second subsection 42, the first subsection 41 and the second subsection 42 are disposed at two opposite sides of the positive electrode connection gate line 212, the first subsection 41 is spaced apart from the positive electrode connection gate line 212 by a third preset distance, and the second subsection 42 is spaced apart from the positive electrode connection gate line 212 by a fourth preset distance. That is, the first insulating layers 40 disposed at intervals in the first direction a may further reduce the area thereof, so that the first insulating layer 40 may not cover the positive electrode connecting gate line 212, thereby further reducing the production cost of the solar cell.
In the embodiment of the present invention, the first subsection 41 and the second subsection 42 may have the same or different shapes and areas, the third predetermined distance may be provided between the first subsection 41 and the positive electrode connecting grid line 212, and the fourth predetermined distance may be provided between the second subsection 42 and the positive electrode connecting grid line 212, and if the shapes and areas of the first subsection 41 and the second subsection 42 are the same, and the third predetermined distance is provided between the first subsection 41 and the positive electrode connecting grid line 212, and the fourth predetermined distance is provided between the second subsection 42 and the positive electrode connecting grid line 212, it is explained that the first subsection 41 and the second subsection 42 are symmetrically disposed at two opposite sides of the positive electrode connecting grid line 212.
The third preset distance and the fourth preset distance can be determined according to the offset distance of the solder strip, so that the solder strip is ensured not to be in contact with the fine gate electrode with opposite polarity under the condition of certain offset.
Optionally, the third preset distance may be equal to the fourth preset distance, and the third preset distance and the fourth preset distance may be 0.01 to 0.5 mm. The arrangement can ensure that the first insulating layer 40 can cover the end part of the negative fine grid electrode 32 close to the positive main grid electrode 21, and avoid the contact between the welding strip and the negative fine grid electrode 32 and the generation of short circuit. Preferably, the third and fourth preset distances may be 0.05-0.1 mm in consideration of process margin, prevention of short circuit, and manufacturing cost.
Alternatively, referring to fig. 5, fig. 5 shows a schematic structural diagram of another solar cell in an embodiment of the present invention, wherein a second insulating layer 50 is disposed between adjacent negative electrode connection points 311, and covers a second end point of the positive fine gate electrode 22 between the adjacent negative electrode connection points 311 close to the negative electrode connection gate line 312 and a portion including the second end point, that is, the second insulating layer 50 covers a portion of the positive fine gate electrode 22 closest to the negative electrode connection gate line 312, but does not cover the negative fine gate electrode 32 between the adjacent negative electrode connection points 311, so that the second insulating layer 50 disposed between the adjacent negative electrode connection points 311 is disposed at intervals along the first direction a, that is, the second insulating layer 50 is disposed at a position corresponding to the positive fine gate electrode 22 to prevent short circuit from occurring when the solder strip is offset, but the second insulating layer 50 is not disposed at a position corresponding to the negative fine gate electrode 32, avoid the too big and higher manufacturing cost of insulating layer area.
Alternatively, referring to fig. 6, fig. 6 shows a schematic structural diagram of another solar cell in an embodiment of the present invention, wherein the second insulating layer 50 may include a third subsection 51 and a fourth subsection 52, the third subsection 51 and the fourth subsection 52 are disposed at two opposite sides of the negative electrode connecting grid line 312, the third subsection 51 is spaced from the negative electrode connecting grid line 312 by a fifth preset distance, and the fourth subsection 52 is spaced from the negative electrode connecting grid line 312 by a sixth preset distance. That is, the second insulating layer 50 is disposed at intervals along the first direction a, so that the area thereof can be further reduced, and the second insulating layer 50 may not cover the negative electrode connecting gate line 312, thereby further reducing the production cost of the solar cell.
In the embodiment of the present invention, since the height of the anode fine gate electrode 22 is higher, after the second insulating layer 50 is disposed on the end D of the anode fine gate electrode 22 close to the cathode connecting gate line 312, the height of the anode fine gate electrode 22 overlapping the second insulating layer 50 is higher, so that the conductive wire (solder strip) welded to the cathode connecting point 311 does not easily contact the cathode connecting gate line 312 between the cathode connecting points 311, and the risk that the cathode connecting gate line 312 is broken by the solder strip is lower, therefore, the second insulating layer 50 may not be disposed on the cathode connecting gate line 312, so that the second insulating layers 50 are disposed on the two sides of the cathode connecting gate line 312, thereby reducing the amount of insulating glue used, and reducing the production cost of the solar cell.
In the embodiment of the present invention, the shapes and areas of the third subsection 51 and the fourth subsection 52 may be the same or different, the fifth preset distance is provided between the third subsection 51 and the negative electrode connecting grid line 312, and the sixth preset distance is provided between the fourth subsection 52 and the negative electrode connecting grid line 312, and if the shapes and areas of the third subsection 51 and the fourth subsection 52 are the same, and the fifth preset distance is provided between the third subsection 51 and the negative electrode connecting grid line 312 and the sixth preset distance is provided between the fourth subsection 52 and the negative electrode connecting grid line 312, it is described that the third subsection 51 and the fourth subsection 52 are symmetrically disposed on two opposite sides of the negative electrode connecting grid line 312.
The fifth preset distance and the sixth preset distance can be determined according to the offset distance of the solder strip, so that the solder strip is ensured not to be in contact with the fine gate electrode with opposite polarity under the condition of certain offset.
Optionally, the fifth preset distance may be equal to the sixth preset distance, and the fifth preset distance and the sixth preset distance may be 0.01 to 0.5 mm. The arrangement can ensure that the second insulating layer 50 can cover the end part of the positive fine grid electrode 22 close to the negative main grid electrode 31, and avoid the contact between the welding strip and the positive fine grid electrode 22 and the generation of short circuit. Preferably, the fifth and sixth preset distances may be 0.05-0.1 mm in consideration of process margin, prevention of short circuit, and manufacturing cost.
Alternatively, the first insulating layer 40 may be disposed on the negative fine grid electrode 32 between the adjacent positive connection points 211 such that the first insulating layer 40 covers the first end point and a portion including the first end point of the negative fine grid electrode 32 between the adjacent positive connection points 211, and/or the second insulating layer 50 may be disposed on the positive fine grid electrode 22 between the adjacent negative connection points 311 such that the second insulating layer 50 covers the second end point and a portion including the second end point of the positive fine grid electrode 22 between the adjacent negative connection points 311.
Alternatively, the first insulating layer 40 may be disposed between the adjacent positive electrode connection points 211, the first insulating layer 40 covers the first end point and a part including the first end point of the negative electrode fine gate electrode 32 between the adjacent positive electrode connection points 211, and also covers the positive electrode connection gate line 212 between the adjacent positive electrode connection points 211, and a part connected to the positive electrode connection gate line 212 in the positive electrode fine gate electrode 22, and/or the second insulating layer 50 may be disposed between the adjacent negative electrode connection points 311, and the second insulating layer 50 covers the second end point and a part including the second end point of the positive electrode fine gate electrode 22 between the adjacent negative electrode connection points 311, and also covers the negative electrode connection gate line 312 between the adjacent negative electrode connection points 311, and a part connected to the negative electrode connection gate line 312 in the negative electrode fine gate electrode 32. The first insulating layer 40 located between the adjacent positive electrode connecting points 211 and/or the second insulating layer 50 located between the adjacent negative electrode connecting points 311 are integrated, and the process preparation of the first insulating layer 40 and the second insulating layer 50 is facilitated.
Alternatively, the first insulating layer 40 may be provided in a rectangular structure, and a size of the first insulating layer 40 along the first direction a may be smaller than a size of the first insulating layer 40 along the second direction B. Accordingly, the second insulating layer 50 may also be provided in a rectangular structure, and the size of the second insulating layer 50 along the first direction a may also be smaller than the size of the second insulating layer 50 along the second direction B.
Alternatively, the ratio between the size of the positive electrode connection point 211 in the second direction B and the size of the first insulating layer 40 in the second direction B may be 1:0.6 to 1: 1.5. If the first insulating layer 40 includes the first and second subsections 41 and 42 disposed at opposite sides of the positive electrode connection gate line 212, a ratio between a size of the positive electrode connection point 211 in the second direction B and a sum of sizes of the first and second subsections 41 and 42 in the second direction B may be 1:0.6 to 1: 1.5. Thereby providing a large process margin for the interconnection of the conductive lines for the first insulating layer 40 in the second direction B, so that even if some conductive lines are arranged slightly obliquely, an unexpected short circuit between the negative fine gate line electrode 32 and the conductive lines can be suitably prevented, and a good insulating and isolating effect can be obtained using an insulating layer having a small area.
Accordingly, the ratio between the size of the negative electrode connection point 311 in the second direction B and the size of the second insulation layer 50 in the second direction B may be 1:0.6 to 1: 1.5. If the second insulating layer 50 includes the third and fourth parts 51 and 52 disposed at opposite sides of the negative electrode connecting gate line 312, a ratio between a size of the negative electrode connecting point 311 in the second direction B and a sum of sizes of the third and fourth parts 51 and 52 in the second direction B may be 1:0.6 to 1: 1.5. Thereby providing a large process margin for the second insulating layer 50 for the conductive line interconnection in the second direction B, so that even if some conductive lines are arranged slightly obliquely, an unexpected short circuit between the positive electrode fine gate line electrode 22 and the conductive line can be suitably prevented, and a good insulating and isolating effect can be obtained using an insulating layer having a small area.
Optionally, if the first insulating layer 40 includes the first subsection 41 and the second subsection 42 disposed at two opposite sides of the positive electrode connecting grid line 212, the size of the first subsection 41 and the size of the second subsection 42 along the second direction B may be both larger than the size of the conductive line along the second direction B, so as to prevent an unexpected short circuit between the negative electrode fine grid line electrode 32 and the conductive line, and obtain a better insulating and isolating effect.
Accordingly, if the second insulating layer 50 includes the third and fourth portions 51 and 52 disposed at two opposite sides of the negative electrode connecting grid line 312, the sizes of the third and fourth portions 51 and 52 in the second direction B may be larger than the sizes of the conductive lines in the second direction B, so as to prevent an unexpected short circuit between the positive electrode thin grid line electrode 22 and the conductive lines, and obtain a better insulating and isolating effect.
Alternatively, the positive electrode connection point 211 may include a central portion, and an outer peripheral portion disposed outside the central portion.
In the embodiment of the present invention, the central portion of the positive electrode connection point 211 may be a silver electrode prepared from silver paste, and the outer edge portion may be an aluminum electrode prepared from aluminum paste, so that the amount of silver used can be reduced, and the cost can be saved.
Optionally, in a range of a seventh preset distance from the positive main grid electrode 21, the size (width) in the first direction a and the size (height) in the third direction may gradually decrease along a direction away from the positive main grid electrode 21, that is, the width and height of the end, close to the negative main grid electrode 31, of the positive fine grid electrode 22 are smaller, so that the possibility of contact between the solder strip corresponding to the negative main grid electrode 31 and the positive fine grid electrode 22 may be reduced.
Accordingly, the size (width) of the negative electrode fine grid electrode 32 in the first direction a and the size (height) of the negative electrode fine grid electrode 32 in the third direction may be gradually decreased in a direction away from the negative electrode main grid electrode 31 within an eighth preset distance from the negative electrode main grid electrode 31, that is, the width and height of the end of the negative electrode fine grid electrode 32 close to the positive electrode main grid electrode 21 are smaller, so that the possibility of contact between the solder strip corresponding to the positive electrode main grid electrode 21 and the negative electrode fine grid electrode 32 may be reduced.
The third direction is perpendicular to the first direction A and the second direction B, and the seventh preset distance and the eighth preset distance can be determined according to the offset distance of the solder strip, so that the solder strip is further ensured not to be in contact with the fine gate electrode with opposite polarity under the condition of certain offset.
Fig. 7 is a schematic cross-sectional view of a solar cell in an embodiment of the present invention, in which, as shown in fig. 7, a positive electrode 20 is disposed on an N-type diffusion region 60 in a backlight surface of a semiconductor substrate 10, and a negative electrode 30 is disposed on a P-type diffusion region 70 in the backlight surface of the semiconductor substrate 10. The light-facing surface of the semiconductor substrate 10 may be a textured structure obtained by texturing, and meanwhile, an antireflection layer 80 may be disposed on the light-facing surface of the semiconductor substrate 10 to increase the solar rays absorbed by the solar cell, thereby improving the efficiency of the solar cell.
In the present novel embodiment of useThe first and second insulating layers 40 and 50 may contain light-reflecting particles, such as a plurality of ZnO or SiO2、ITO、MgO、TiO2、Al2O3Etc. with a particle size of 20-100 nm, so that the sunlight incident to the solar cell is scattered, the optical path of the sunlight in the semiconductor substrate is increased, and the electrical conversion efficiency of the solar cell is improved.
It should be noted that, because the negative electrode connecting grid line 312 and the negative electrode fine grid electrode 32 in the solar cell may be silver electrodes prepared from silver paste, the positive electrode connecting grid line 212 and the positive electrode fine grid electrode 22 may be aluminum electrodes prepared from aluminum paste, and both silver and aluminum have good light reflection effects, an insulating layer having a light reflection effect may not be disposed on the positive electrode connecting grid line 212 and the positive electrode fine grid electrode 22, and the negative electrode connecting grid line 312 and the negative electrode fine grid electrode 32, because no significant optical gain is brought, and the amount of insulating materials can be reduced.
To sum up, in the embodiment of the present invention, the method includes: the semiconductor substrate, positive electrode and negative electrode arranged on the backlight surface of the semiconductor substrate, a first insulating layer and a second insulating layer; the positive electrode includes anodal main grid electrode and anodal thin grid electrode, and the negative electrode includes negative pole main grid electrode and negative pole thin grid electrode, and anodal main grid electrode and negative pole main grid electrode are parallel to each other and the interval sets up along first direction, and anodal main grid electrode includes: a plurality of positive pole tie points for being connected with the conductor wire to and connect the positive pole connecting grid line of adjacent positive pole tie point, negative pole main grid electrode includes: a plurality of negative electrode connection points for connection with the conductive wires, and a negative electrode connection gate line connecting adjacent negative electrode connection points; the positive fine grid electrode and the negative fine grid electrode are parallel to each other and arranged at intervals along a second direction, the positive fine grid electrode is connected with the positive main grid electrode and is separated from the negative main grid electrode by a first preset distance, and the negative fine grid electrode is connected with the negative main grid electrode and is separated from the positive main grid electrode by a second preset distance; the first insulating layer covers the first end point of the negative fine grid electrode close to the positive electrode connecting grid line and the positive fine grid electrode which comprises a part of the first end point and does not cover the space between adjacent positive electrode connecting points; the second insulating layer covers a second end point of the positive fine gate electrode near the negative connection gate line and a portion including the second end point. In the utility model, because the anode fine grid electrode is usually an aluminum electrode, even if the position of the welding strip connected with the anode connecting point deviates to a certain degree, the welding strip is in contact with the anode fine grid electrode and cannot cause short circuit or the welding strip can not weld the anode fine grid electrode, so that the first insulating layer arranged between the adjacent anode connecting points can only cover the first end point of the cathode fine grid electrode and one part containing the first end point, but does not cover the anode fine grid electrode, thereby avoiding the arrangement of the first insulating layer in a large area, reducing the area of the first insulating layer and lowering the production cost of the solar cell.
The embodiment of the utility model also provides a photovoltaic module which comprises a plurality of solar cells and a plurality of conducting wires, wherein one end of each conducting wire is connected with a plurality of positive electrode connection points in a positive electrode of each solar cell, and the other end of each conducting wire is connected with a plurality of negative electrode connection points in a negative electrode of each adjacent solar cell, so that the solar cells are electrically connected with the adjacent solar cells, and the currents generated and gathered in the solar cells and the adjacent solar cells are further collected.
Fig. 8 shows a schematic structural diagram of a photovoltaic module according to an embodiment of the present invention, as shown in fig. 8, the photovoltaic module may include a first solar cell 91, a second solar cell 92, and a third solar cell 93, and a first conductive wire 101, a second conductive wire 102, and a third conductive wire 103, wherein each conductive wire may be a solder strip capable of being soldered.
Specifically, the first conductive line 101 extends in a first direction a of a backlight surface of the first solar cell 91, one end of the first conductive line extends out of the first solar cell 91 and is connected to a bus bar or other solar cells, and the other end of the first conductive line can be connected to a plurality of positive connection points 211 of the first solar cell 91 by using a conductive adhesive or by welding, and meanwhile, in order to prevent the first conductive line 101 from contacting the negative fine grid electrode 32 in the first solar cell 91, the first insulating layer 40 can be arranged, so that the first conductive line 101 is electrically insulated from the negative fine grid electrode 32 by the first insulating layer 40, and a short circuit is avoided; the second conductive wires 102 are extended in the first direction a of the backlight surfaces of the first solar cell 91 and the second solar cell 92, one end of each of the second conductive wires is connected to the plurality of negative electrode connection points 311 of the first solar cell 91, and the other end of each of the second conductive wires is connected to the plurality of positive electrode connection points 211 of the second solar cell 92, meanwhile, the second insulating layer 50 may be disposed in the first solar cell 91 so that the second conductive wires 102 are electrically insulated from the positive electrode fine grid electrodes 22 in the first solar cell 91 through the second insulating layer 50, and the first insulating layer 40 may be disposed in the second solar cell 92 so that the second conductive wires 102 are electrically insulated from the negative electrode fine grid electrodes 32 in the second solar cell 92 through the first insulating layer 40; the third conductive wire 103 extends in the first direction a of the backlight surfaces of the second solar cell 92 and the third solar cell 93, one end of the third conductive wire is connected to the plurality of negative electrode connection points 311 of the second solar cell 92, and the other end of the third conductive wire is connected to the plurality of positive electrode connection points 211 of the third solar cell 93, meanwhile, the second insulating layer 50 may be disposed in the second solar cell 92, so that the third conductive wire 103 is electrically insulated from the positive electrode fine gate electrode 22 in the second solar cell 92 by the second insulating layer 50, and the first insulating layer 40 may be disposed in the third solar cell 93, so that the third conductive wire 103 is electrically insulated from the negative electrode fine gate electrode 32 in the third solar cell 93 by the first insulating layer 40.
In the embodiment of the utility model, the cross section of the conductive wire can be in a circular or rectangular structure, and the width of the conductive wire with the rectangular cross section is larger than the thickness of the conductive wire, so that the connection reliability between the conductive wire and the solar cell can be improved. The line width of the conductive lines may be 0.5 to 2 mm, and the number of conductive lines respectively connected to the positive electrode connection point 211 and the negative electrode connection point 311 in one solar cell may be 5 to 15. The distance between adjacent conductive lines may be 4-8 mm.
Preferably, the line width of the conductive lines may be 0.5 to 1.5 mm, and the distance between adjacent conductive lines is greater than or equal to 2 mm and less than or equal to 0.5 times the length of the semiconductor substrate in the first direction.
In the embodiment of the utility model, the conductive wire can be connected to the positive electrode connection point or the negative electrode connection point on the backlight surface of each solar cell through a conductive adhesive or welding. The conductive adhesive may be a solder paste including tin or a tin-containing alloy, or a conductive paste formed by including tin or a tin-containing alloy in epoxy resin, acrylic resin, or silicone resin.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
Through the above description of the embodiments, those skilled in the art will clearly understand that the method of the above embodiments can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but in many cases, the former is a better implementation manner. Based on such understanding, the technical solutions of the present invention may be embodied in the form of a software product, which is stored in a storage medium (such as ROM/RAM, magnetic disk, optical disk) and includes instructions for enabling a terminal (such as a mobile phone, a computer, a server, an air conditioner, or a network device) to execute the method according to the embodiments of the present invention.
While the present invention has been described with reference to the embodiments shown in the drawings, the present invention is not limited to the embodiments, which are illustrative and not restrictive, and it will be apparent to those skilled in the art that various changes and modifications can be made therein without departing from the spirit and scope of the utility model as defined in the appended claims.
Claims (11)
1. A solar cell, comprising:
the device comprises a semiconductor substrate, and a positive electrode, a negative electrode, a first insulating layer and a second insulating layer which are arranged on a backlight surface of the semiconductor substrate;
the positive electrode comprises a positive main grid electrode and a positive fine grid electrode, the negative electrode comprises a negative main grid electrode and a negative fine grid electrode, the positive main grid electrode and the negative main grid electrode are parallel to each other along a first direction and are arranged at intervals, and the positive main grid electrode comprises: a plurality of positive electrode connection points for connection with a conductive wire, and a positive electrode connection gate line connecting adjacent ones of the positive electrode connection points, the negative electrode main gate electrode comprising: the negative electrode connecting grid lines are used for connecting the negative electrode connecting points with the conducting wires;
the positive electrode fine grid electrode and the negative electrode fine grid electrode are parallel to each other along a second direction and are arranged at intervals, the positive electrode fine grid electrode is connected with the positive electrode main grid electrode and is separated from the negative electrode main grid electrode by a first preset distance, and the negative electrode fine grid electrode is connected with the negative electrode main grid electrode and is separated from the positive electrode main grid electrode by a second preset distance;
the first insulating layer covers a first end point of the negative fine grid electrode close to the positive electrode connecting grid line, a part including the first end point and does not cover the positive electrode fine grid electrode between the adjacent positive electrode connecting points;
the second insulating layer covers a second end point of the positive fine grid electrode close to the negative connecting grid line and a part containing the second end point.
2. The solar cell of claim 1, wherein the first insulating layer comprises a first subsection and a second subsection;
the first sub portion and the second sub portion are arranged on two opposite sides of the positive electrode connecting grid line, a third preset distance is arranged between the first sub portion and the positive electrode connecting grid line, and a fourth preset distance is arranged between the second sub portion and the positive electrode connecting grid line.
3. The solar cell of claim 2, wherein the third predetermined distance is equal to the fourth predetermined distance;
the third preset distance and the fourth preset distance are 0.01-0.5 mm.
4. The solar cell of claim 1, wherein the second insulating layer does not cover the negative fine grid electrode between adjacent negative connection points.
5. The solar cell of claim 4, wherein the second insulating layer comprises a third subsection and a fourth subsection;
the third subsection and the fourth subsection are arranged on two opposite sides of the negative electrode connecting grid line, a fifth preset distance is arranged between the third subsection and the negative electrode connecting grid line, and a sixth preset distance is arranged between the fourth subsection and the negative electrode connecting grid line.
6. The solar cell according to claim 1, wherein the first insulating layer is provided on the negative fine grid electrode between the adjacent positive connection points, and the first insulating layer covers only a first end point of the negative fine grid electrode between the adjacent positive connection points and a portion including the first end point;
and/or the second insulating layer is arranged on the positive electrode fine grid electrode between the adjacent negative electrode connecting points, and only covers the second end point of the positive electrode fine grid electrode between the adjacent negative electrode connecting points and a part containing the second end point.
7. The solar cell according to claim 1, wherein the first insulating layer is provided between adjacent ones of the negative electrode connection points, the first insulating layer covers a first end point and a portion including the first end point of the negative electrode fine gate electrode between adjacent ones of the positive electrode connection points, and a portion of the positive electrode connection gate line, the positive electrode fine gate electrode, between adjacent ones of the positive electrode connection points, which is connected to the positive electrode connection gate line;
and/or the second insulating layer is arranged between the adjacent negative electrode connecting points, the second insulating layer covers the second end point of the positive electrode fine grid electrode between the adjacent negative electrode connecting points and a part containing the second end point, and the negative electrode connecting grid line between the adjacent negative electrode connecting points and a part of the negative electrode fine grid electrode connected with the negative electrode connecting grid line.
8. The solar cell according to any of claims 1-7, wherein the first insulating layer is provided in a rectangular configuration, the dimension of the first insulating layer in the first direction being smaller than the dimension of the first insulating layer in the second direction.
9. The solar cell according to any one of claims 1 to 7, wherein a ratio between a dimension of the positive electrode connection point in the second direction and a dimension of the first insulating layer in the second direction is 1:0.6 to 1: 1.5.
10. The solar cell of claim 2, wherein the dimensions of the first and second sections in the second direction are each greater than the dimension of the conductive wires in the second direction.
11. A photovoltaic module comprising a plurality of solar cells of any one of claims 1-10 and a plurality of electrically conductive wires;
one end of the conductive wire is connected with a plurality of positive connection points in the positive electrode of the solar cell, and the other end of the conductive wire is connected with a plurality of negative connection points in the negative electrode of the adjacent solar cell.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115632086A (en) * | 2022-09-14 | 2023-01-20 | 泰州隆基乐叶光伏科技有限公司 | Welding method and photovoltaic module |
| US11588060B1 (en) | 2022-02-24 | 2023-02-21 | Solarlab Aiko Europe Gmbh | Electrode structure of back contact cell, back contact cell, back contact cell module, and back contact cell system |
| WO2024021930A1 (en) * | 2022-07-27 | 2024-02-01 | 泰州隆基乐叶光伏科技有限公司 | Solar cell and solar cell module |
| GB2623679A (en) * | 2022-12-06 | 2024-04-24 | Jinko Solar Haining Co Ltd | Solar Cell and Photovoltaic Module |
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2021
- 2021-06-30 CN CN202121491135.4U patent/CN215988787U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11588060B1 (en) | 2022-02-24 | 2023-02-21 | Solarlab Aiko Europe Gmbh | Electrode structure of back contact cell, back contact cell, back contact cell module, and back contact cell system |
| WO2024021930A1 (en) * | 2022-07-27 | 2024-02-01 | 泰州隆基乐叶光伏科技有限公司 | Solar cell and solar cell module |
| CN115632086A (en) * | 2022-09-14 | 2023-01-20 | 泰州隆基乐叶光伏科技有限公司 | Welding method and photovoltaic module |
| WO2024055674A1 (en) * | 2022-09-14 | 2024-03-21 | 泰州隆基乐叶光伏科技有限公司 | Soldering method and photovoltaic module |
| GB2623679A (en) * | 2022-12-06 | 2024-04-24 | Jinko Solar Haining Co Ltd | Solar Cell and Photovoltaic Module |
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