Solar cell and photovoltaic module

Abstract

The utility model discloses a solar cell and a photovoltaic assembly, and belongs to the technical field of photovoltaic assemblies, the solar cell comprises a cell body, and the cell body is provided with a first side edge and a second side edge which are oppositely arranged along a first direction; the insulating layer is arranged on the battery piece body, the insulating layer comprises a first insulating strip and a second insulating strip, a first distance is formed between the end part, close to the first side edge, of the first insulating strip and the first side edge, and a first thickening unit is arranged at the end part, close to the second side edge, of the first insulating strip; the second insulating strip and the first insulating strip are arranged in a spaced mode in the second direction, a second distance exists between the end, close to the second side edge, of the second insulating strip and the second side edge, a second thickening unit is arranged at the end, close to the first side edge, of the second insulating strip, and the second direction intersects with the first direction. According to the utility model, the short circuit phenomenon in the connection of the interconnecting strip and the battery piece can be avoided, and the insulativity of the connection of the interconnecting strip and the battery piece is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of photovoltaic components, in particular to a solar cell and a photovoltaic component. Background Art

[0002] Back-contact solar cells refer to cells in which the positive and negative electrodes are both located on the back of the cell to reduce the shading of the positive or negative electrode on the front of the cell, thereby improving the photoelectric conversion efficiency of the cell.

[0003] The positive electrode of the back-contact solar cell includes a positive main grid and a plurality of positive fine grids connected to the positive main grid. The current generated by the cell is collected by the plurality of positive fine grids and transmitted to the positive main grid, thereby collecting the current generated by the cell. The negative electrode includes a negative main grid and a plurality of negative fine grids connected to the negative main grid. The current generated by the cell is collected by the plurality of negative fine grids and transmitted to the negative main grid, thereby collecting the current generated by the cell; then one end of the interconnection strip is connected to the positive main grid of a cell, and the other end is extended and connected to the negative main grid of another adjacent cell; thereby connecting two adjacent cells in series to form a battery string.

[0004] In the process of processing back-contact solar cells, in order to avoid short circuits in the cells, an insulating layer needs to be provided between each interconnection strip and the cell to ensure the insulation performance of the cell. However, if the insulating layer is too wide, the cost of the cell will increase; if the insulating layer is too narrow, the interconnection strip will deviate beyond the insulating layer, making it easy for the soldering ribbon and the cell to short-circuit. Utility Model Content

[0005] The utility model discloses a solar cell and a photovoltaic module to solve or at least partially solve the problem of high processing cost of solar cells or short circuit of solar cells in the prior art. In order to solve the above technical problems, the utility model is implemented as follows:

[0006] In a first aspect, the utility model discloses a solar cell, comprising: a cell body, wherein the cell body has a first side and a second side that are arranged opposite to each other along a first direction; an insulating layer, wherein the insulating layer is arranged on the cell body, and the insulating layer comprises a first insulating strip and a second insulating strip; the first insulating strip extends along the first direction, and an end of the first insulating strip close to the first side has a first distance from the first side, and an end close to the second side is provided with a first thickening unit; the second insulating strip also extends along the first direction, and is spaced apart from the first insulating strip along the second direction, and an end of the second insulating strip close to the second side has a second distance from the second side, and an end close to the first side is provided with a second thickening unit; wherein the second direction intersects with the first direction.

[0007] Optionally, the width of the first bold unit gradually increases along the direction from the first side to the second side; and / or the width of the second bold unit gradually increases along the direction from the second side to the first side.

[0008] Optionally, the first insulating strip and the second insulating strip each include a plurality of strips, the plurality of first insulating strips and the plurality of second insulating strips are spaced apart along the second direction, and the second insulating strips and the first insulating strips are alternately arranged in sequence along the second direction.

[0009] Optionally, along the direction from the first side edge to the second side edge, the first thickening unit includes a plurality of insulating parts one arranged along the first direction; and / or, along the direction from the second side edge to the first side edge, the second thickening unit includes a plurality of insulating parts two arranged along the first direction.

[0010] Optionally, along the second direction, the insulating part 1 is strip-shaped as a whole; and / or, along the second direction, the insulating part 2 is strip-shaped as a whole; and / or, along the first direction, multiple insulating parts 1 are arranged at intervals; and / or, along the first direction, multiple insulating parts 2 are arranged at intervals; and / or, at least one insulating part 1 includes multiple sub-insulating parts 1 arranged at intervals along the second direction; and / or, at least one insulating part 2 includes multiple sub-insulating parts 2 arranged at intervals along the second direction.

[0011] Optionally, along the second direction, the width range of the first bold unit is greater than or equal to 4 mm and less than or equal to 7 mm; and / or, along the second direction, the width range of the second bold unit is greater than or equal to 4 mm and less than or equal to 7 mm; and / or, along the first direction, the first distance is greater than or equal to 1 mm and less than or equal to 4 mm; and / or, along the first direction, the second distance is greater than or equal to 1 mm and less than or equal to 4 mm.

[0012] Optionally, a third thickening unit is provided at an end of the first insulating strip close to the first side, and a fourth thickening unit is further provided at an end of the second insulating strip close to the second side.

[0013] Optionally, along the first direction, the length of the first bold unit is greater than the length of the third bold unit, and the length of the second bold unit is greater than the length of the fourth bold unit; and / or, along the second direction, the maximum width of the first bold unit is greater than the maximum width of the third bold unit, and the maximum width of the second bold unit is greater than the maximum width of the fourth bold unit; and / or, along the direction from the first side to the second side, the width of the third bold unit gradually decreases; and / or, along the direction from the second side to the first side, the width of the fourth bold unit gradually decreases.

[0014] Optionally, along the direction from the first side to the second side, the third thickened unit includes a plurality of insulating parts three arranged along the first direction; and / or, along the direction from the second side to the first side, the fourth thickened unit includes a plurality of insulating parts four arranged along the first direction.

[0015] Optionally, along the second direction, the insulating part three is strip-shaped as a whole; and / or, along the second direction, the insulating part four is strip-shaped as a whole; and / or, along the first direction, multiple insulating parts three are arranged at intervals; and / or, along the first direction, multiple insulating parts four are arranged at intervals; and / or, at least one insulating part three includes multiple sub-insulating parts three arranged at intervals along the second direction; and / or, at least one insulating part four includes multiple sub-insulating parts four arranged at intervals along the second direction.

[0016] In a second aspect, the utility model discloses a photovoltaic module, comprising a plurality of solar cells as described above and a plurality of interconnection strips, wherein the plurality of solar cells are connected by the plurality of interconnection strips, wherein at least two of the solar cells are arranged along the first direction, and the interconnection strips extend from above the first insulating strip of one of the solar cells to above the second insulating strip of another adjacent solar cell.

[0017] Optionally, the solar cell is a back-contact solar cell; and / or the interconnection strip has a first projection on the plane where the solar cell is located, the first insulating strip or the second insulating strip has a second projection on the plane where the solar cell is located, and the first projection at least partially falls within the second projection.

[0018] Optionally, along the first direction, one end of the interconnection strip connected above the first insulating strip of one of the solar cells has a third distance from the first side of one of the solar cells, and the third distance is greater than or equal to the first distance; and / or, along the first direction, one end of the interconnection strip connected above the second insulating strip of one of the solar cells has a fourth distance from the second side of one of the solar cells, and the fourth distance is greater than or equal to the second distance.

[0019] Optionally, the third distance is greater than or equal to 1 mm and less than or equal to 4 mm; and / or, the fourth distance is greater than or equal to 1 mm and less than or equal to 4 mm; and / or, along the second direction, the width of the interconnection strip is greater than or equal to 0.4 mm and less than or equal to 0.8 mm.

[0020] The utility model discloses a solar cell and a photovoltaic module. The solar cell comprises a cell body, wherein the cell body has a first side and a second side that are arranged opposite to each other along a first direction; an insulating layer, wherein the insulating layer is arranged on the cell body, and the insulating layer comprises a first insulating strip and a second insulating strip, wherein the first insulating strip extends along the first direction, and an end of the first insulating strip close to the first side has a first distance from the first side, and an end close to the second side is provided with a first thickening unit; the second insulating strip also extends along the first direction, and is spaced apart from the first insulating strip along the second direction, and an end of the second insulating strip close to the second side has a second distance from the second side, and an end close to the first side is provided with a second thickening unit; wherein the second direction intersects with the first direction.

[0021] In the utility model, by setting a first distance between the end of the first insulating strip close to the first side and the first side, and setting a second distance between the end of the second insulating strip close to the second side and the second side, along the first direction, the length of the first insulating strip and the length of the second insulating strip are adapted to the extension length of the interconnection strip. Thus, while ensuring the insulation between the interconnection strip and the battery cell, the amount of insulating material used in the insulation layer can be appropriately saved, thereby reducing the production cost of the photovoltaic module.

[0022] Furthermore, in the present invention, the first insulating strip includes a first thickening unit and a third thickening unit, and the second insulating strip includes a second thickening unit and a fourth thickening unit, and the first thickening unit is arranged at the end of the first insulating strip close to the second side edge, and the second thickening unit is arranged at the end of the second insulating strip close to the first side edge. The insulation of the first insulating strip in the area where the battery cell is close to another adjacent battery cell is enhanced by the first thickening unit, the insulation of the second insulating strip in the area where the battery cell is close to another adjacent battery cell is enhanced by the second thickening unit, and the insulation of the end of the interconnecting strip and the battery cell connection is enhanced by the third and fourth thickening units, so that the insulation of the connection between the interconnecting strip and the battery cell is better.

[0023] Furthermore, in the present invention, the first thickened unit and the second thickened unit are gradually widened, which appropriately reduces the amount of insulating material used in the insulating layer while ensuring the insulation of the first insulating strip and the second insulating strip, thereby reducing the production cost of the photovoltaic module. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 The structure of the solar cell in the embodiment of the utility model is shown in FIG. Figure 1 ;

[0025] Figure 2 A schematic diagram showing a part of the structure of the photovoltaic assembly described in the embodiment of the utility model;

[0026] Figure 3 A schematic diagram showing the partial structure of the interconnection strip and the solar cell in the embodiment of the utility model Figure 2 .

[0027] Figure 4 A schematic diagram showing the structure of the first bold unit and the third bold unit in an embodiment of the utility model.

[0028] Figure 5 A schematic diagram showing the structure of the second bold unit and the fourth bold unit in an embodiment of the utility model.

[0029] Reference numerals:

[0030] 10: battery cell body; 11: first side edge; 12: second side edge; 20: insulation layer;

[0031] 21: first insulating strip; 211: first bold unit; 212: third bold unit;

[0032] 2111: insulation part 1; 2121: insulation part 3;

[0033] 22: second insulating strip; 221: second bold unit; 222: fourth bold unit;

[0034] 2211: Insulation part 2; 2221: Insulation part 4;

[0035] 30: Interconnection strip;

[0036] A: first direction; B: second direction. DETAILED DESCRIPTION

[0037] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the fixed scope of the utility model.

[0038] It should be understood that the references to "one embodiment" or "an embodiment" throughout the specification mean that the specific features, structures, or characteristics associated with the embodiment are included in at least one embodiment of the present invention. Therefore, the references to "in one embodiment" or "in an embodiment" appearing throughout the specification do not necessarily refer to the same embodiment. In addition, these specific features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

[0039] like Figures 1 to 3 As shown, an embodiment of the utility model discloses a solar cell, including a cell body 10, wherein the cell body 10 has a first side 11 and a second side 12 that are arranged opposite to each other along a first direction A; an insulating layer 20, wherein the insulating layer 20 is arranged on the cell body 10, and the insulating layer 20 includes a first insulating strip 21 and a second insulating strip 22, wherein the first insulating strip 21 extends along the first direction A, and an end of the first insulating strip 21 close to the first side 11 has a first distance from the first side 11, and an end close to the second side 12 is provided with a first thickening unit 211; the second insulating strip 22 also extends along the first direction A, and is spaced apart from the first insulating strip 21 along the second direction B, and an end of the second insulating strip 22 close to the second side 12 has a second distance from the second side 12, and an end close to the first side 11 is provided with a second thickening unit 221, wherein the second direction B intersects with the first direction A.

[0040] The utility model discloses a solar cell, which can be a back contact solar cell. A back contact solar cell (Interdig itated Back Contact, IBC) means that the positive and negative electrodes of the cell are both arranged on the back of the cell, that is, the backlight side of the cell. No electrode is arranged on the front side of the cell, that is, the light receiving side of the cell. Thereby reducing the shielding of the electrode on the front side of the cell, and improving the photoelectric conversion efficiency of the cell.

[0041] like Figures 1 to 3 As shown, the solar cell in the embodiment of the utility model includes a cell body 10 and an insulating layer 20, and the insulating layer 20 is arranged on the cell body 10. Among them, the cell body 10 is the core part of the solar cell, which can convert solar energy into electrical energy. The insulating layer 20 is attached to the cell body 10, and the insulating layer 20 has insulation properties.

[0042] The insulating layer 20 in the embodiment of the utility model includes a first insulating strip 21 and a second insulating strip 22. The first insulating strip 21 and the second insulating strip 22 both extend along a first direction A, and the second insulating strip 22 is spaced apart from the first insulating strip 21 along a second direction B. In the embodiment of the utility model, the first direction A can be set as the width direction of the battery cell body 10, and the second direction B can be set as the length direction of the battery cell body 10.

[0043] like Figures 1 to 3 As shown, the end of the first insulating strip 21 close to the first side 11 has a first distance A1 from the first side 11, the end of the first insulating strip 21 close to the second side 12 can be close to the second side 12 or extend to the second side 12, and the end of the first insulating strip 21 close to the second side 12 is provided with a first thickening unit 211. The end of the second insulating strip 22 close to the first side 11 can be close to the first side or extend to the first side 11, and the end of the second insulating strip 22 close to the first side 11 is provided with a second thickening unit 221, and the end of the second insulating strip 22 close to the second side 12 has a second distance B1 from the second side 12.

[0044] During the processing of the photovoltaic module, it is necessary to arrange a plurality of solar cells along the first direction A, for example, in an alternate arrangement, and connect two adjacent solar cells together through an interconnection bar 30 to collect the current generated by the solar cells. Exemplarily, in two adjacent solar cells, one end of the interconnection bar 30 is connected to the positive electrode of one solar cell, and the other end of the interconnection bar 30 spans the gap between the two adjacent solar cells and is connected to the negative electrode of another adjacent solar cell, thereby connecting the two adjacent solar cells together.

[0045] For example, one end of the interconnection bar 30 can be laid above the first insulating bar 21 of a solar cell, and the first insulating bar 21 can block the electrical connection between one end of the interconnection bar 30 and the fine grid and the negative main grid of the solar cell. One end of the interconnection bar 30 can be connected to the positive electrode of the solar cell. The other end of the interconnection bar 30 passes through the gap between two adjacent solar cells and extends to the top of the second insulating bar 22 of another adjacent solar cell. The second insulating bar 22 can block the electrical connection between the other end of the interconnection bar 30 and the fine grid and the positive main grid of the solar cell, so that the other end of the interconnection bar 30 can be connected to the negative electrode of another adjacent solar cell, thereby connecting two adjacent solar cells through the interconnection bar 30.

[0046] In the embodiment of the utility model, a first distance A1 is set between the end of the first insulating strip 21 close to the first side 11 and the first side 11, and a second distance B1 is set between the end of the second insulating strip 22 close to the second side 12 and the second side 12. Along the first direction A, the length of the first insulating strip 21 and the length of the second insulating strip 22 are adapted to the extension length of the interconnection strip 30, so that while ensuring insulation, the amount of insulating material used in the insulating layer 20 can be appropriately saved, thereby reducing the production cost of the photovoltaic module.

[0047] Furthermore, in the embodiment of the utility model, the end of the first insulating strip 21 close to the second side 12 is close to or extended to the second side 12, and the first thickening unit 211 is provided at the end. The end of the second insulating strip 22 close to the first side 11 is close to or extended to the first side 11, and the second thickening unit 221 is provided at the end. The first thickening unit 211 enhances the insulation of the first insulating strip 21 in the area where the cell is close to another adjacent cell, and the second thickening unit 221 enhances the insulation of the second insulating strip 22 in the area where the cell is close to another adjacent cell.

[0048] Furthermore, in the embodiment of the utility model, only the first thickened unit 211 and the second thickened unit 221 are widened, thereby ensuring the insulation effect of the first insulating strip 21 and the second insulating strip 22, thereby improving the reliability of the photovoltaic module circuit.

[0049] It should be noted that the first side 11 and the second side 12 can be understood according to actual conditions. For example, after the battery cell is rotated 180 degrees, the first side 11 is located at the bottom and the second side 12 is located at the top. In the embodiment of the utility model, along the first direction A, the first distance A1 is greater than or equal to 1 mm and less than or equal to 4 mm. Exemplarily, the first distance A1 can be set to 1 mm, 1.5 mm, 2 mm, 2.5 mm, 3 mm, 3.5 mm, 4 mm or values ​​between two of them.

[0050] In addition, in the embodiment of the utility model, the second distance B1 may be greater than or equal to 1 mm and less than or equal to 4 mm along the first direction A. For example, the second distance B1 may be set to 1 mm, 1.5 mm, 2 mm, 2.5 mm, 3 mm, 3.5 mm, 4 mm or values ​​therebetween.

[0051] Alternatively, if Figure 2 and Figure 3 As shown, in the embodiment of the utility model, the width of the first bold unit 211 gradually increases along the direction from the first side 11 to the second side 12; and / or, the width of the second bold unit 221 gradually increases along the direction from the second side 12 to the first side 11.

[0052] like Figure 2 and Figure 3 As shown, two adjacent solar cells are connected by an interconnection bar 30. During the processing or use of the photovoltaic module, if there is a mutual offset between the two adjacent solar cells, it is easy to cause the interconnection bar 30 to deviate. The interconnection bar 30 deviates greatly in the area where one cell is close to another adjacent cell. The interconnection bar 30 in this area is easy to deviate out of the insulating layer 20, which is easy to cause a short circuit in the interconnection bar cell connection.

[0053] In order to avoid the above-mentioned short circuit phenomenon, the amount of insulating material used in the insulating layer 20 is reduced as much as possible. In the embodiment of the utility model, the width of the first thickened unit 211 is set to gradually increase along the direction from the first side 11 to the second side 12. That is to say, the width of the first thickened unit 211 gradually decreases along the direction from the second side 12 to the first side 11. And the second thickened unit 221 is set to gradually increase along the direction from the second side 12 to the first side 11. That is to say, the width of the second thickened unit 221 gradually decreases along the direction from the first side 11 to the second side 12. In this way, the widths of the first thickened unit 211 and the second thickened unit 221 are not completely consistent, which can not only ensure the offset of the interconnection strip out of the insulating layer 20, but also appropriately reduce the amount of insulating material used in the insulating layer 20.

[0054] Alternatively, if Figure 2 and Figure 3 As shown, the first insulating strip 21 and the second insulating strip 22 in the embodiment of the utility model each include a plurality of strips, and the plurality of first insulating strips 21 and second insulating strips 22 are arranged at intervals along the second direction B, and the second insulating strips 22 and the first insulating strips 21 are arranged alternately along the second direction B in sequence.

[0055] like Figure 2 and Figure 3As shown, in a photovoltaic module, two adjacent solar cells need to be connected together through a plurality of interconnection bars 30. Each interconnection bar 30 extends from above the first insulating bar 21 of one cell to above the second insulating bar 22 of another adjacent cell, and the interconnection bar 30 may be a welding strip.

[0056] In order to achieve insulation between the multiple interconnection bars 30 and the battery cell, in the embodiment of the utility model, multiple first insulating bars 21 are provided on the battery cell body 10, and the multiple first insulating bars 21 extend along the first direction A and are arranged at intervals along the second direction B. Multiple second insulating bars 22 also extend along the first direction A and are arranged at intervals along the second direction B, and the second insulating bars 22 and the first insulating bars 21 are arranged alternately along the second direction B in sequence.

[0057] Optionally, along the direction from the first side 11 to the second side 12, the first thickened unit 211 includes a plurality of insulating parts 2111 arranged along the first direction A; and / or, along the direction from the second side 12 to the first side 11, the second thickened unit 221 includes a plurality of insulating parts 2211 arranged along the first direction A.

[0058] like Figure 3 As shown, in some embodiments, the first thickened unit 211 includes a plurality of insulating parts 1 2111 arranged at intervals along the first direction A and whose widths increase sequentially; the second thickened unit 221 includes a plurality of insulating parts 2 2211 arranged at intervals along the first direction A and whose widths increase sequentially. The width of the first thickened unit 211 and the width of the second thickened unit 221 are inconsistent, so that the amount of insulating glue used can be appropriately reduced during the processing of the photovoltaic module, thereby reducing the processing cost of the photovoltaic module. Of course, in the actual process, the widths of the plurality of insulating parts 1 2111 may not increase completely sequentially, and the widths of the plurality of insulating parts 2 2211 may not increase completely sequentially, and the embodiments of the utility model do not make any special limitation on this.

[0059] Specifically, the insulating portion 1 2111 and / or the insulating portion 2 2211 can be strip-shaped as a whole, and multiple insulating portions 1 2111 and multiple insulating portions 2 2211 can be arranged at intervals or without intervals. Along the second direction B, the width range of the insulating portion 1 2111 in the first thickened unit 211 and / or the width range of the insulating portion 2 2211 in the second thickened unit 221 are both greater than or equal to 4 mm and less than or equal to 7 mm. In other words, along the second direction B, the width range of the first thickened unit 211 and / or the second thickened unit 221 are both greater than or equal to 4 mm and less than or equal to 7 mm.

[0060] For example, along the second direction B, the width of the first thickened unit 211 can be sequentially set to 4 mm, 5 mm, 5.5 mm, 6 mm, 7 mm, etc. Along the second direction B, the width of the second thickened unit 221 can be sequentially set to 4 mm, 5 mm, 6 mm, 7 mm, etc.

[0061] like Figure 4 , Figure 5 As shown, at least one insulating portion 1 2111 may include a plurality of sub-insulating portions 1 spaced apart along the second direction B, or be composed of a plurality of sub-insulating portions 1 spaced apart along the second direction B, and at least one insulating portion 2 2211 may include a plurality of sub-insulating portions 2 spaced apart along the second direction B, or be composed of a plurality of sub-insulating portions 2 spaced apart along the second direction B. Specifically, the sub-insulating portion 1 and / or the sub-insulating portion 2 as a whole may also be strip-shaped, a plurality of sub-insulating portions 1 may be the same or different, a plurality of sub-insulating portions 2 may be the same or different, a width range of a plurality of sub-insulating portions 1 spaced apart along the second direction B may be greater than or equal to 1 mm and less than or equal to 3 mm, and a width range of a plurality of sub-insulating portions 2 spaced apart may be greater than or equal to 1 mm and less than or equal to 3 mm.

[0062] Optionally, in the embodiment of the utility model, a third thickening unit 212 is provided at an end of the first insulating strip 21 close to the first side 11 , and a fourth thickening unit 222 is provided at an end of the second insulating strip 22 close to the second side 12 .

[0063] like Figure 3 As shown, in the embodiment of the utility model, the end of the first insulating strip 21 close to the first side 11 is provided with a third thickened unit 212, and the end of the second insulating strip 22 close to the second side 12 is provided with a fourth thickened unit 222. Accordingly, the end of the third thickened unit 212 of the first insulating strip 21 close to the end of the first side 11 forms the aforementioned first distance A1 with the first side 11, and the end of the fourth thickened unit 222 of the second insulating strip 22 close to the end of the second side 12 forms the aforementioned second distance B1 with the second side 12. In this way, the insulation between the end of the interconnection strip 30 and the corresponding area of ​​the cell can be enhanced by the third thickened unit 212 and the fourth thickened unit 222, so as to avoid one end of the interconnection strip 30 deviating from the first insulating strip 21 and the second insulating strip 22, causing a short circuit in the interconnection strip cell connection, and ensure the reliability of the insulation between one end of the interconnection strip 30 and the solar cell.

[0064] Alternatively, if Figure 4 and Figure 5As shown, along the first direction A, the length of the first bold unit 211 is greater than the length of the third bold unit 212; and / or, along the first direction A, the length of the second bold unit 221 is greater than the length of the fourth bold unit 222; and / or, along the second direction B, the maximum width of the first bold unit 211 is greater than the maximum width of the third bold unit 212, and / or, along the second direction B, the maximum width of the second bold unit 221 is greater than the maximum width of the fourth bold unit 222.

[0065] In the embodiment of the utility model, along the first direction A, the length of the first thickened unit 211 is equal to the length of the third thickened unit 212, and / or the length of the second thickened unit 221 is greater than the length of the fourth thickened unit 222; and / or, along the second direction B, the maximum width of the first thickened unit 211 is greater than the maximum width of the third thickened unit 212, and / or the maximum width of the second thickened unit 221 is greater than the maximum width of the fourth thickened unit 222. Accordingly, the length and / or width of the third thickened unit 221 and the fourth thickened unit 222 can be appropriately controlled or reduced by setting the length and / or width relationship of the first thickened unit 211, the second thickened unit 212, the third thickened unit 221, and the fourth thickened unit 222, so as to reduce the amount of insulating material used in the insulating layer 20.

[0066] Optionally, in the embodiment of the utility model, the width of the third bold unit 212 gradually decreases along the direction from the first side 11 to the second side 12; and / or, the width of the fourth bold unit 222 gradually decreases along the direction from the second side 12 to the first side 11.

[0067] like Figure 3 As shown, in order to avoid the above-mentioned short circuit phenomenon and appropriately reduce the amount of insulating material used in the insulating layer 20, the width of the third thickened unit 212 gradually decreases along the direction from the first side 11 to the second side 12; and / or, the width of the fourth thickened unit 222 gradually decreases along the direction from the second side 12 to the first side 11, so as to avoid the end of the interconnection bar 30 from deviating from the first insulating bar 21 and the second insulating bar 22, causing a short circuit in the connection between the interconnection bar 30 and the solar cell, thereby ensuring the reliability of the insulation between one end of the interconnection bar 30 and the solar cell.

[0068] Optionally, in the embodiment of the utility model, along the direction from the first side 11 to the second side 12, the third thickened unit 212 includes a plurality of insulating parts three 2121 arranged along the first direction A; and / or, along the direction from the second side 12 to the first side 11, the fourth thickened unit 222 includes a plurality of insulating parts four 2221 arranged along the first direction A.

[0069] Specifically, in the embodiment of the present utility model, the insulating portion 3 2121 and / or the insulating portion 4 2221 may be in the shape of a strip as a whole, and multiple insulating portions 3 2121 and multiple insulating portions 4 2221 may be arranged with or without intervals. Figure 4 and Figure 5 As shown, along the direction from the first side 11 to the second side 12, the third thickened unit 212 includes a plurality of insulating portions 3 2121 arranged at intervals along the first direction A and whose widths decrease successively; and / or, along the direction from the second side 12 to the first side 11, the fourth thickened unit 222 includes a plurality of sub-insulating portions 4 2221 arranged at intervals along the first direction A and whose widths decrease successively. In this way, the insulation of the connection between one end of the interconnection bar 30 and the corresponding area of ​​the battery cell can be enhanced by the third thickened unit 212 and the fourth thickened unit 222, so as to avoid that one end of the interconnection bar 30 deviates from the first insulating bar 21 and the second insulating bar 22, causing a short circuit phenomenon in the interconnection bar battery cell connection. Of course, in the actual process, the widths of the plurality of insulating portions 3 2121 may not completely decrease successively, and the widths of the plurality of insulating portions 4 2221 may not completely decrease successively, and the embodiment of the utility model does not make any special limitation on this.

[0070] like Figure 4 , Figure 5 As shown, at least one insulating portion three 2121 may include a plurality of sub-insulating portions three spaced along the second direction B, or be composed of a plurality of sub-insulating portions three spaced along the second direction B; at least one insulating portion four 2221 may include a plurality of sub-insulating portions four spaced along the second direction B, or be composed of a plurality of sub-insulating portions four spaced along the second direction B. Specifically, the sub-insulating portion three and / or the sub-insulating portion four as a whole may also be strip-shaped, the plurality of sub-insulating portions three may be the same or different, the plurality of sub-insulating portions four may be the same or different, the width range of the plurality of spaced sub-insulating portions three along the second direction B is greater than 0 mm and less than or equal to 2 mm, and the width range of the plurality of spaced sub-insulating portions four is greater than 0 mm and less than or equal to 2 mm.

[0071] It should be noted that the lengths recorded in the above-mentioned multiple places at least mean: along the first direction A, the vertical distance from the outermost end of one side of the topmost insulating part (for example, the uppermost side) to the outermost end of the other side of the other bottommost insulating part (for example, the lowermost side); the widths recorded in the above-mentioned multiple places at least mean: along the second direction B, the horizontal distance from the outermost end of one side of the insulating part or the sub-insulating part to the outermost end of the other side of the insulating part or the sub-insulating part; the first distance and the second distance recorded in the above-mentioned multiple places at least mean: the vertical distance along the first direction A, which need to be clearly explained.

[0072] The utility model also discloses a photovoltaic module, comprising a plurality of solar cells as described in any one of the above embodiments, and a plurality of interconnection bars 30, wherein the plurality of solar cells are connected by the plurality of interconnection bars 30, wherein at least two of the solar cells are arranged along a first direction A, and the interconnection bars 30 extend from above a first insulating bar 21 of one solar cell to above a second insulating bar 22 of another adjacent solar cell.

[0073] It should be noted that the solar cell included in the photovoltaic assembly described in the embodiment of the utility model has the same structure as the solar cell described in any of the above embodiments, and its beneficial effects are also similar, which will not be described in detail here.

[0074] The photovoltaic module in the embodiment of the utility model includes a battery string, and the battery string includes a plurality of solar cells described in any of the above embodiments. The plurality of solar cells are connected through a plurality of interconnection bars 30 to form the battery string. Specifically, there are at least two solar cells, and the at least two solar cells are arranged along the first direction A, and the interconnection bar 30 extends from above the first insulating bar 21 of one of the solar cells to above the second insulating bar 22 of another adjacent solar cell, thereby forming a battery string.

[0075] During the processing of the photovoltaic module, it is necessary to arrange a plurality of solar cells along the first direction A, for example, in an alternate arrangement, and connect two adjacent solar cells together through an interconnection bar 30 to collect the current generated by the solar cells. Exemplarily, in two adjacent solar cells, one end of the interconnection bar 30 is connected to the positive electrode of one solar cell, and the other end of the interconnection bar 30 spans the gap between the two adjacent solar cells and is connected to the negative electrode of another adjacent solar cell, thereby connecting the two adjacent solar cells together.

[0076] In the embodiment of the utility model, one end of the interconnection bar 30 can be laid above the first insulating bar 21 of a solar cell, and the electrical connection between one end of the interconnection bar 30 and the fine grid and the negative main grid of the solar cell is blocked by the first insulating bar 21, so that one end of the interconnection bar 30 can be connected to the positive electrode of the solar cell. The other end of the interconnection bar 30 passes through the gap between two adjacent solar cells and extends to the top of the second insulating bar 22 of another adjacent solar cell, and the second insulating bar 22 can block the electrical connection between the other end of the interconnection bar 30 and the fine grid and the positive main grid of the solar cell, so that the other end of the interconnection bar 30 can be connected to the negative electrode of the adjacent solar cell, thereby connecting two adjacent solar cells through the interconnection bar 30.

[0077] It should be noted that the interconnection bar 30 in the embodiment of the utility model extends along the first direction A, that is, the first direction A is the extension direction of the interconnection bar 30, and the second direction B is the width direction of the interconnection bar 30. Along the second direction B, the width of the interconnection bar 30 can be set to be greater than or equal to 0.4 mm and less than or equal to 0.8 mm. For example, along the second direction B, the width of the interconnection bar 30 can be set to 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, or values ​​therebetween.

[0078] Optionally, the interconnection strip 30 in the embodiment of the utility model has a first projection on the plane where the solar cell is located, and the first insulating strip 21 or the second insulating strip 22 has a second projection on the plane where the solar cell is located, and the first projection at least partially falls within the second projection.

[0079] like Figure 2 and Figure 3 As shown, in the embodiment of the utility model, the first projection of the interconnection bar 30 on the plane where the solar cell is located is set to at least partially fall within the second projection of the first insulating strip 21 or the second insulating strip 22 on the plane where the solar cell is located. Therefore, the electrical connection between the interconnection bar 30 and the electrode of the solar cell can be blocked by the first insulating strip 21 or the second insulating strip 22, thereby improving the insulation of the connection between the interconnection bar 30 and the cell.

[0080] Alternatively, if Figure 2 and Figure 3 As shown, in the embodiment of the utility model, along the first direction A, one end of the interconnection bar 30 connected above the first insulating bar 21 of one of the solar cells has a third distance A2 from the first side 11 of one of the solar cells, and the third distance A2 is greater than or equal to the first distance A1; and / or, along the first direction A, one end of the interconnection bar 30 connected above the second insulating bar 22 of one of the solar cells has a fourth distance B2 from the second side 12 of one of the solar cells, and the fourth distance B2 is greater than or equal to the second distance B1.

[0081] like Figure 2 and Figure 3As shown, in the embodiment of the utility model, along the first direction A, one end of the interconnection bar 30 connected above the first insulating bar 21 of one of the solar cells has a third distance A2 from the first side 11 of one of the solar cells, and the third distance A2 is greater than or equal to the first distance A1, so as to ensure the reliability of insulation between one end of the interconnection bar 30 and the solar cell. Along the first direction A, one end of the interconnection bar 30 connected above the second insulating bar 22 of one of the solar cells has a fourth distance B2 from the second side 12 of one of the solar cells, and the fourth distance B2 is greater than or equal to the second distance B1, so as to ensure the reliability of insulation between the other end of the interconnection bar 30 and the solar cell.

[0082] It should be noted that, in the embodiment of the present invention, the third distance A2 and the fourth distance B2 are both greater than or equal to 1 mm and less than or equal to 4 mm. For example, the third distance A2 and the fourth distance B2 can be set to 1 mm, 1.5 mm, 2 mm, 2.5 mm, 3 mm, 3.5 mm, 4 mm, or values ​​therebetween.

[0083] It should be noted that the various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0084] Although the optional embodiments of the utility model embodiments have been described, those skilled in the art, once knowing the basic creative concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including optional embodiments and all changes and modifications falling within the scope of the utility model embodiments.

[0085] Finally, it should be noted that, in this article, relational terms such as first, second, third, fourth, etc. are only used to distinguish one entity from another entity, and do not necessarily require or imply any such actual relationship or order between these entities. Moreover, the terms "include", "comprises", or any other variants thereof are intended to cover non-exclusive inclusion, so that an article or terminal device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such article or terminal device. In the absence of further restrictions, the elements defined by the sentence "comprises a ..." do not exclude the existence of other identical elements in the article or terminal device including the elements.

[0086] The technical solution provided by the present invention is introduced in detail above. Specific examples are used in this article to illustrate the principle and implementation method of the present invention. At the same time, for those skilled in the art, according to the principle and implementation method of the present invention, there will be changes in the specific implementation method and application scope. In summary, the content of this specification should not be understood as a limitation on the present invention.

Claims

1. A solar cell, characterized in that: include: A battery cell body, wherein along a first direction, the battery cell body has a first side edge and a second side edge which are arranged opposite to each other; An insulating layer, the insulating layer is disposed on the battery cell body, and the insulating layer includes a first insulating strip and a second insulating strip; The first insulating strip extends along the first direction, an end of the first insulating strip close to the first side has a first distance from the first side, and a first thickening unit is provided at the end close to the second side; The second insulating strip also extends along the first direction and is spaced apart from the first insulating strip along the second direction, a second distance is provided between an end of the second insulating strip close to the second side and the second side, and a second thickening unit is provided at the end close to the first side; The second direction intersects with the first direction.

2. The solar cell according to claim 1, characterized in that: Along the direction from the first side to the second side, the width of the first bold unit gradually increases; And / or, along the direction from the second side edge to the first side edge, the width of the second bold unit gradually increases.

3. The solar cell according to claim 1, characterized in that: The first insulating strips and the second insulating strips each include a plurality of strips, the plurality of first insulating strips and the plurality of second insulating strips are spaced apart along the second direction, and the second insulating strips and the first insulating strips are alternately arranged in sequence along the second direction.

4. The solar cell according to claim 1, characterized in that: Along the direction from the first side to the second side, the first thickened unit includes a plurality of insulating portions 1 arranged along the first direction; And / or, along the direction from the second side edge to the first side edge, the second thickening unit includes a plurality of insulating parts 2 arranged along the first direction.

5. The solar cell according to claim 4, characterized in that: Along the second direction, the insulating portion is in a strip shape as a whole; And / or, along the second direction, the second insulating portion is entirely strip-shaped; and / or, along the first direction, a plurality of the insulating portions are arranged at intervals; and / or, along the first direction, a plurality of the insulating portions are arranged at intervals; And / or, at least one of the insulating parts 1 includes a plurality of sub-insulating parts 1 spaced apart along the second direction; And / or, at least one of the insulating parts 2 includes a plurality of sub-insulating parts 2 spaced apart along the second direction.

6. The solar cell according to claim 1, characterized in that: Along the second direction, the width of the first thickened unit ranges from greater than or equal to 4 mm to less than or equal to 7 mm; and / or, along the second direction, the width of the second thickened unit ranges from greater than or equal to 4 mm to less than or equal to 7 mm; and / or, along the first direction, the first distance is greater than or equal to 1 mm and less than or equal to 4 mm; And / or, along the first direction, the second distance is greater than or equal to 1 mm and less than or equal to 4 mm.

7. The solar cell according to claim 1, characterized in that: A third thickening unit is disposed at an end of the first insulating strip close to the first side, and a fourth thickening unit is disposed at an end of the second insulating strip close to the second side.

8. The solar cell according to claim 7, characterized in that: Along the first direction, the length of the first bold unit is greater than the length of the third bold unit, and the length of the second bold unit is greater than the length of the fourth bold unit; and / or, along the second direction, the maximum width of the first bold unit is greater than the maximum width of the third bold unit, and the maximum width of the second bold unit is greater than the maximum width of the fourth bold unit; and / or, along the direction from the first side edge to the second side edge, the width of the third bold unit gradually decreases; And / or, along the direction from the second side edge to the first side edge, the width of the fourth bold unit gradually decreases.

9. The solar cell according to claim 7, characterized in that: Along the direction from the first side to the second side, the third thickened unit includes a plurality of insulating portions arranged along the first direction; And / or, along the direction from the second side to the first side, the fourth thickened unit includes a plurality of insulating parts four arranged along the first direction.

10. The solar cell according to claim 9, characterized in that: Along the second direction, the insulating portion three is in a strip shape as a whole; And / or, along the second direction, the insulating portion 4 is entirely strip-shaped; and / or, along the first direction, a plurality of the insulating portions are arranged at three intervals; And / or, along the first direction, a plurality of the insulating parts are arranged at intervals; And / or, at least one of the insulating portions three comprises a plurality of sub-insulating portions three spaced apart along the second direction; And / or, at least one of the insulating parts four includes a plurality of sub-insulating parts four spaced apart along the second direction.

11. A photovoltaic module, characterized in that: The method comprises a plurality of solar cells according to any one of claims 1 to 10, and a plurality of interconnection strips, wherein the plurality of solar cells are connected by the plurality of interconnection strips, wherein at least two of the solar cells are arranged along the first direction, and the interconnection strips extend from above the first insulating strip of one of the solar cells to above the second insulating strip of another adjacent solar cell.

12. The photovoltaic module according to claim 11, characterized in that: The solar cell is a back-contact solar cell; and / or the interconnection strip has a first projection on the plane where the solar cell is located, the first insulating strip or the second insulating strip has a second projection on the plane where the solar cell is located, and the first projection at least partially falls within the second projection.

13. The photovoltaic module according to claim 11, characterized in that: Along the first direction, one end of the interconnection strip connected above the first insulating strip of one of the solar cells has a third distance from the first side of one of the solar cells, and the third distance is greater than or equal to the first distance; And / or, along the first direction, one end of the interconnection strip connected above the second insulating strip of one of the solar cells has a fourth distance from the second side of one of the solar cells, and the fourth distance is greater than or equal to the second distance.

14. The photovoltaic module according to claim 13, characterized in that: The third distance is greater than or equal to 1 mm and less than or equal to 4 mm; And / or, the fourth distance is greater than or equal to 1 mm and less than or equal to 4 mm; And / or, along the second direction, the width of the interconnection strip is greater than or equal to 0.4 mm and less than or equal to 0.8 mm.

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