CN215644513U - Back contact solar cell - Google Patents
Back contact solar cell Download PDFInfo
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- CN215644513U CN215644513U CN202120939531.2U CN202120939531U CN215644513U CN 215644513 U CN215644513 U CN 215644513U CN 202120939531 U CN202120939531 U CN 202120939531U CN 215644513 U CN215644513 U CN 215644513U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
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Abstract
The utility model discloses a back contact solar cell, which belongs to the field of solar cells and comprises a conductive back plate and cell pieces, wherein a main grid is arranged on each cell piece, the conductive back plate is used for conducting circuit drainage on the main grid on each cell piece, each main grid comprises a positive main grid and a negative main grid, the positive main grids and the negative main grids are alternately arranged at intervals, interdigital middle conductive copper foils used for connecting two adjacent cell pieces are arranged on the conductive back plate, each middle conductive copper foil comprises a main copper foil belt and a first copper foil belt and a second copper foil belt, the first copper foil belt and the second copper foil belt extend towards different sides from the main copper foil belts, the first copper foil belt is correspondingly matched and connected with the positive main grid in one cell piece, and the second copper foil belt and the negative main grid in the other cell piece are correspondingly matched and connected. The utility model has the advantages of effectively solving the current leading-out problem of the back contact battery and simplifying the packaging process.
Description
[ technical field ] A method for producing a semiconductor device
The utility model relates to a back contact solar cell, and belongs to the field of solar cells.
[ background of the utility model ]
With the progress of the photovoltaic industry technology, the dependence of the industry on government subsidies is weakened, and in the photovoltaic non-subsidy era, the low-price internet surfing is inevitably required to be realized by competing with the traditional fossil fuel power generation. The size of the efficient battery technology is increased to enable the power of the assembly to reach over 600W, along with the research and development of novel batteries, the efficiency is improved, the power of a single assembly reaches 700W, and the power cost of a power station is greatly reduced. The back contact battery has no grid lines on the front surface, so that the efficiency is far higher than that of the conventional PERC battery, and the back contact battery is a future technical development direction. However, the conventional PERC module packaging process and material cannot meet the requirement of back contact battery packaging, and the packaging process is complex and high in cost.
[ Utility model ] content
The technical problem to be solved by the utility model is to overcome the defects of the prior art and provide a back contact solar cell, which effectively solves the current leading-out problem of the back contact cell and simplifies the packaging process.
The technical scheme adopted by the utility model is as follows:
the utility model provides a back of body contact solar cell, includes electrically conductive backplate and battery piece, be equipped with the main bars on the battery piece, electrically conductive backplate is used for carrying out the circuit drainage with the main bars on the battery piece, the main bars includes anodal main bars and negative pole main bars, and anodal main bars and negative pole main bars are interval setting in turn, be equipped with the middle conductive copper foil that is used for connecting the interdigital form of two adjacent battery pieces on the electrically conductive backplate, middle conductive copper foil includes main copper foil strip and follows first copper foil strip and the second copper foil strip of main copper foil strip towards the first copper foil strip and the second copper foil strip that different sides extend, first copper foil strip corresponds the matching and connects with the anodal main bars position in one of them battery piece, the negative pole main bars position in second copper foil strip and another battery piece corresponds the matching and connects.
The utility model has the following beneficial effects:
in the utility model, the conductive back plate is provided with the middle conductive copper foil which is in an interdigital shape and is provided with the first copper foil belt and the second copper foil belt which extend towards different directions, the first copper foil belt is correspondingly matched with the positive main grid position in one battery piece, the second copper foil belt is correspondingly matched with the negative main grid position in the other battery piece, the corresponding matching refers to that the projection position of the first copper foil belt is coincided with the projection position of the positive main grid under the stacking state of the conductive back plate and the battery piece, and similarly, the projection position of the second copper foil belt is coincided with the projection position of the negative main grid. After the design, when the packaging is carried out, after the battery piece is correspondingly paved on the conductive back plate, the positive main grid and the first copper foil piece and the negative main grid and the second copper foil piece are in one-to-one correspondence, the circuit conduction can be rapidly realized, the problem of leading out the current of the back contact battery is effectively solved, the packaging process is simpler, and the production process difficulty is reduced.
Preferably, the positive electrode main grids of the two adjacent battery pieces are positioned on the same straight line, the negative electrode main grids of the two adjacent battery pieces are also positioned on the same straight line, the length direction of the main copper foil strip is perpendicular to the positive electrode main grids or the negative electrode main grids, and the first copper foil piece and the second copper foil piece are arranged at intervals along the length direction of the main copper foil strip.
Preferably, a plurality of first copper foil strips are distributed on the main copper foil strip at intervals; and/or a plurality of second copper foil strips are distributed on the main copper foil strip at intervals.
Preferably, the conductive back plate further comprises an end conductive copper foil, the end conductive copper foil comprises an end bus strip and a third copper foil strip extending from the end bus strip, and the polarity of the main grid connected with the corresponding first copper foil strip or the second copper foil strip on the battery piece at the end of the third copper foil strip is opposite to that of the main grid connected with the corresponding first copper foil strip or the corresponding second copper foil strip on the battery piece at the end of the third copper foil strip.
Preferably, a plurality of third copper foil strips are distributed on the end bus strip at intervals.
Preferably, the back contact solar cell comprises at least two cell strings, each cell string comprises a plurality of cell sheets which are connected, and the middle parts of two adjacent cell strings are connected through an end bus bar.
Preferably, the conductive back plate comprises a back plate body, the middle conductive copper foil is distributed on the back plate body, and the back plate body is a light-transmitting body.
Preferably, the lengths of the positive electrode main grid or the negative electrode main grid on the battery piece are both L1, and the lengths of the corresponding first copper foil strip or the corresponding second copper foil strip are both L2, so that L2 is greater than L1.
Preferably, the width of each positive electrode main grid or each negative electrode main grid on each cell piece is W1, the length of each corresponding first copper foil strip or second copper foil strip is W2, and the requirement that W2/W1 is 1.1-1.3 is met.
Preferably, the middle conductive copper foil strip is connected with the positive electrode main grid or the negative electrode main grid through solder paste or conductive adhesive.
These features and advantages of the present invention will be disclosed in more detail in the following detailed description and the accompanying drawings.
[ description of the drawings ]
The utility model is further described below with reference to the accompanying drawings:
fig. 1 is a schematic view illustrating a connection between a battery piece and a conductive back plate according to an embodiment of the utility model;
FIG. 2 is an enlarged schematic view at A in FIG. 1;
fig. 3 is a schematic view of a conductive backplane according to a second embodiment of the present invention.
[ detailed description ] embodiments
The technical solutions of the embodiments of the present invention are explained and illustrated below with reference to the drawings of the embodiments of the present invention, but the following embodiments are only preferred embodiments of the present invention, and not all embodiments. Based on the embodiments in the implementation, other embodiments obtained by those skilled in the art without any creative effort belong to the protection scope of the present invention.
In the following description, the terms such as "inner", "outer", "upper", "lower", "left", "right", etc., which indicate orientations or positional relationships, are used for convenience in describing embodiments and simplifying descriptions, but do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present invention.
The first embodiment is as follows:
as shown in fig. 1 to 2, a simple back contact solar cell is shown, which includes a conductive back plate and cells, where the cells shown in fig. 1 include 4 cells, where an upper cell and a lower cell on the left side form a cell string, an upper cell and a lower cell on the right side form a cell string, each cell is provided with a main grid, the conductive back plate is configured to conduct current to the main grids on the cells, the main grids include a positive main grid 11 and a negative main grid 12, the positive main grids 11 and the negative main grids 12 are alternately arranged at intervals, taking the cell at the top left corner in fig. 1 as an example, the main grids include 4 main grids altogether, and the positive main grid 11, the negative main grid 12, the positive main grid 11 and the negative main grid 12 are respectively arranged from left to right.
Be equipped with the conductive copper foil 2 in the middle of the interdigital form that is used for connecting two adjacent battery pieces on the electrically conductive backplate, middle conductive copper foil 2 includes main copper foil strip 20 and follows first copper foil strip 21 and the second copper foil strip 22 that main copper foil strip 20 extends towards different sides, demonstrates cross arrangement, positive pole main grid 11 position correspondence in first copper foil strip 21 and one of them battery piece matches and connects, negative pole main grid 12 position correspondence in second copper foil strip 22 and another battery piece matches and connects.
In this embodiment, the conductive back plate is provided with the middle conductive copper foil 2, the middle conductive copper foil 2 is in an interdigital shape, and the first copper foil strip 21 and the second copper foil strip 22 extending towards different directions are provided, the first copper foil strip 21 is correspondingly matched with the position of the positive main grid 11 in one of the battery pieces, the second copper foil strip 22 is correspondingly matched with the position of the negative main grid 12 in the other battery piece, and the corresponding matching refers to that the projection position of the first copper foil strip 21 is coincident with the projection position of the positive main grid 11 in the stacked state of the conductive back plate and the battery pieces, and similarly, the projection position of the second copper foil strip 22 is coincident with the projection position of the negative main grid 12.
After the design, when encapsulating, with the battery piece correspondence lay the electrically conductive backplate on the back, anodal main grid 11 and first copper foil area 21, negative pole main grid 12 and second copper foil area 22 position one-to-one can realize the circuit fast and switch on, effectively solve the back of the body contact battery current and draw forth the problem, packaging technology is simpler moreover, reduces the production technology degree of difficulty.
In the connection mode, the middle conductive copper foil 2 belt is connected with the positive main grid 11 or the negative main grid 12 through solder paste or conductive adhesive. Compared with a conventional PERC welding mode, the welding method has the advantages that the thermal stress is reduced, thinner battery pieces can be compatible, hidden cracking and breaking risks are reduced, copper foils are sequentially bonded to the battery pieces according to the same position, the production process difficulty is reduced, and the battery breaking rate is reduced.
Specifically referring to fig. 1, for convenience of description, the two battery pieces on the left side are defined as an upper battery piece and a lower battery piece in the present embodiment, two second copper foil strips 22 are disposed on the upper side of the main copper foil strip 20 and respectively correspond to the negative main grids 12 on the upper battery piece, and two first copper foil strips 21 are disposed on the lower side of the main copper foil strip 20 and respectively correspond to the positive main grids 11 on the lower battery piece.
It should be noted that the number of the first copper foil strips 21 and the second copper foil strips 22 may be selected according to actual situations, and this embodiment is only used for illustration.
In this embodiment, the positive electrode main grids 11 of the two adjacent battery pieces are located on the same straight line, and the negative electrode main grids 12 of the two adjacent battery pieces are also located on the same straight line. Referring to fig. 1, the positive electrode main grid 11 of the upper cell and the positive electrode main grid 11 of the lower cell are almost collinear in the vertical direction, the length direction of the main copper foil strip 20 is perpendicular to the positive electrode main grid 11 or the negative electrode main grid 12, and the first copper foil strip 21 and the second copper foil strip 22 are arranged at intervals along the length direction of the main copper foil strip 20. By means of the design, the main grids on the battery piece can be conveniently designed, the layout is more unified, and the design of the main grids is unified, so that the shape and size of the middle copper foil strip are relatively unified.
In this embodiment, the conductive back plate further includes an end portion conductive copper foil 3 besides the middle conductive copper foil 2, the end portion conductive copper foil 3 is mainly used for current drainage of the battery piece at the end portion, the end portion conductive copper foil 3 includes an end portion bus strip 30 and a third copper foil strip 31 extending from the end portion bus strip 30, and the polarities of the main grids connected to the corresponding first copper foil strip 21 or the corresponding second copper foil strip 22 on the battery piece at the end portion of the third copper foil strip 31 are opposite.
Specifically, referring to fig. 1, for convenience of description, the end conductive copper foil 3 is divided into an upper end conductive copper foil and a lower end conductive copper foil, the third copper foil strips 31 on the upper end conductive copper foil are respectively connected to the positive main grids 11 on the upper battery plate, and the polarities of the negative main grids 12 connected to the second copper foil strips 22 are opposite. And the third copper foil strip 31 on the lower conductive copper foil is correspondingly connected with the negative main grid 12 on the lower battery piece and has opposite polarity with the positive main grid 11 connected with the first copper foil strip 21. Similarly, the number of the third copper foil strips 31 is also multiple, and is specifically set according to actual needs.
In addition, in the present embodiment, there is another function of connecting the adjacent cell strings with the end portion conductive copper foil 3, as shown in fig. 1, the back contact solar cell includes two cell strings, each cell string includes a plurality of cell sheets connected, and the adjacent two cell strings are connected by the end portion conductive copper foil 3, more specifically, by the end portion bus bar 30.
Referring specifically to fig. 2, a welding void 32 is reserved between the two cell strings for welding the end bus bars 30 of the two cell strings to each other, and the polarities of the main bars to which the end bus bars 30 of the two cell strings are connected are opposite.
Preferably, in this embodiment, the conductive backplane includes a backplane body, the middle conductive copper foil 2 and the end conductive equal-proportion 3 are both distributed on the backplane body, and the backplane body is a light-transmitting body. Because the copper foil is interdigital, the back of the battery is not completely shielded, the conductive back plate is a light-transmitting body, double-sided power generation can be carried out, and the power generation efficiency is high.
In specific specification parameters, the lengths of the positive electrode main grid 11 or the negative electrode main grid 12 on the battery piece are both L1, and the lengths of the corresponding first copper foil strip 21 or the corresponding second copper foil strip 22 are both L2, so that the condition that L2 is greater than L1 is met. Still taking fig. 1 as an example, the length of the positive electrode main grid 11 or the negative electrode main grid 12 refers to the length in the vertical direction.
In addition, in terms of the selection of the width parameters, the width of the positive electrode main grid 11 or the negative electrode main grid 12 on the cell is W1, the length of the corresponding first copper foil strip 21 or second copper foil strip 22 is W2, and the requirement of W2/W1 is 1.1-1.3.
The width and the length of the first copper foil strip 21/the second copper foil strip 22 are properly widened and lengthened relative to the positive electrode main grid 11/the negative electrode main grid 12, so that when the battery piece is paved on the conductive back plate, a certain error range can be allowed, and even if the position between the battery piece and the conductive back plate deviates, the connection between the main grid and the middle conductive copper foil 2 cannot be influenced. It should be noted that the above parameters are also selected and applied to the third copper foil strip 31.
Example two
As shown in fig. 3, the present embodiment is different from the first embodiment in that each battery string includes 10 battery cells, the number of the middle conductive copper foils 2 is 9, and the present embodiment is an extension of the first embodiment.
While the utility model has been described with reference to specific embodiments thereof, it will be understood by those skilled in the art that the utility model is not limited thereto, and may be embodied in many different forms without departing from the spirit and scope of the utility model as set forth in the following claims. Any modification which does not depart from the functional and structural principles of the present invention is intended to be included within the scope of the claims.
Claims (10)
1. The utility model provides a back of body contact solar cell, includes electrically conductive backplate and battery piece, be equipped with the main bars on the battery piece, electrically conductive backplate is used for carrying out the circuit drainage with the main bars on the battery piece, the main bars includes anodal main bars and negative pole main bars, and anodal main bars and negative pole main bars are interval setting in turn, its characterized in that, be equipped with the middle conductive copper foil that is used for connecting the interdigital form of two adjacent battery pieces on the electrically conductive backplate, middle conductive copper foil includes main copper foil strip and follows first copper foil strip and the second copper foil strip of main copper foil strip towards different homonymy extensions, first copper foil strip corresponds the matching and is connected with anodal main bars position in one of them battery piece, the second copper foil strip corresponds the matching and is connected with the negative pole main bars position in another battery piece.
2. The back contact solar cell of claim 1, wherein the positive main grids of two adjacent cells are located on the same straight line, the negative main grids of two adjacent cells are also located on the same straight line, the length direction of the main copper foil strip is perpendicular to the positive main grid or the negative main grid, and the first copper foil sheet and the second copper foil sheet are spaced along the length direction of the main copper foil strip.
3. The back contact solar cell of claim 2, wherein the main copper foil strip has a plurality of first copper foil strips spaced apart; and/or a plurality of second copper foil strips are distributed on the main copper foil strip at intervals.
4. The back contact solar cell of claim 2, further comprising end conductive copper foils on the conductive back sheet, wherein the end conductive copper foils comprise end bus bars and third copper foil strips extending from the end bus bars, and the third copper foil strips are connected to the corresponding first or second copper foil strips on the end cell sheet with a main grid polarity opposite to that of the main grid.
5. The back contact solar cell of claim 4, wherein the end bus bar has a plurality of third copper foil strips spaced apart therefrom.
6. The back contact solar cell of claim 4, wherein the back contact solar cell comprises at least two cell strings, each cell string comprises a plurality of the cell sheets connected together, and two adjacent cell strings are connected by the end bus bar.
7. The back contact solar cell of any one of claims 1 to 6, wherein the conductive back sheet comprises a back sheet body, the intermediate conductive copper foil is distributed on the back sheet body, and the back sheet body is a light-transmitting body.
8. The back contact solar cell of any one of claims 1 to 6, wherein the lengths of the positive main grid or the negative main grid on the cell sheet are both L1, and the lengths of the corresponding first copper foil strip or the second copper foil strip are both L2, so that L2 is greater than L1.
9. The back contact solar cell of any one of claims 1 to 6, wherein the width of each positive main grid or each negative main grid on the cell sheet is W1, and the length of each corresponding first copper foil strip or second copper foil strip is W2, so that W2/W1 is 1.1-1.3.
10. The back contact solar cell of any one of claims 1 to 6, wherein the intermediate conductive copper foil strip is connected to the positive or negative electrode main grid by solder paste or conductive adhesive.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120939531.2U CN215644513U (en) | 2021-04-30 | 2021-04-30 | Back contact solar cell |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120939531.2U CN215644513U (en) | 2021-04-30 | 2021-04-30 | Back contact solar cell |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215644513U true CN215644513U (en) | 2022-01-25 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120939531.2U Active CN215644513U (en) | 2021-04-30 | 2021-04-30 | Back contact solar cell |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215644513U (en) |
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2021
- 2021-04-30 CN CN202120939531.2U patent/CN215644513U/en active Active
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