CN217334102U - Battery piece and photovoltaic module with same - Google Patents
Battery piece and photovoltaic module with same Download PDFInfo
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- CN217334102U CN217334102U CN202123271690.9U CN202123271690U CN217334102U CN 217334102 U CN217334102 U CN 217334102U CN 202123271690 U CN202123271690 U CN 202123271690U CN 217334102 U CN217334102 U CN 217334102U
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- conductive film
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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
- Y02E10/547—Monocrystalline silicon PV cells
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Abstract
The utility model discloses a battery piece and photovoltaic module who has it, the battery piece includes: a body; the conductive film is arranged on at least one side surface of the body and comprises a first conductive film area and a second conductive film area, and the second conductive film area is positioned on the outer periphery side of the first conductive film area; the plurality of main grid lines are arranged on one side of the conductive film, which is far away from the body, and are arranged at intervals along a first direction, and each main grid line extends along a second direction which is vertical to the first direction; the plurality of the secondary grid lines are arranged at intervals along the second direction, each secondary grid line extends along the first direction, and the material of the part of the plurality of the secondary grid lines located in the second conductive film area is different from the material of the part of the plurality of the secondary grid lines located in the first conductive film area. According to the utility model discloses a battery piece, when reducing the cost of battery piece, can avoid the copper ion to enter into the silicon to can guarantee the electrical property of battery piece, and then can guarantee the output of battery piece.
Description
Technical Field
The utility model belongs to the technical field of the photovoltaic technology and specifically relates to a battery piece and photovoltaic module who has it is related to.
Background
In the related art, in the printing process of the battery piece, due to the existence of precision deviation, the paste is printed in the bare silicon area of the battery piece when the grid lines are printed. However, since the slurry contains copper, and copper is a deep level defect in the forbidden bandwidth of silicon, minority carriers are generated and the muscle is increased, so that the electrical performance of the battery piece is rapidly reduced, and the output power of the battery piece is greatly reduced.
SUMMERY OF THE UTILITY MODEL
The utility model discloses aim at solving one of the technical problem that exists among the prior art at least. Therefore, an object of the present invention is to provide a battery plate, which can ensure the electrical performance of the battery plate while reducing the cost of the battery plate, thereby ensuring the output power of the battery plate.
Another object of the utility model is to provide a photovoltaic module including above-mentioned battery piece.
According to the utility model discloses battery piece, include: a body; the conductive film is arranged on at least one side surface of the body and comprises a first conductive film region and a second conductive film region, and the second conductive film region is positioned on the outer periphery side of the first conductive film region; the conductive film comprises a body, a plurality of main grid lines and a plurality of conductive films, wherein the conductive films are arranged on one sides of the body, the main grid lines are arranged at intervals along a first direction, and each main grid line extends along a second direction perpendicular to the first direction; the plurality of secondary grid lines are arranged at intervals along the second direction, each secondary grid line extends along the first direction, and the material of the part, located in the second conductive film area, of each secondary grid line is different from that of the part, located in the first conductive film area, of each secondary grid line.
According to the utility model discloses battery piece, the material of the part that is located the second conductive film region through making a plurality of vice grid lines is different with the material of the part that is located the first conductive film region of a plurality of vice grid lines. Therefore, when the cost of the battery piece is reduced, copper ions can be prevented from entering silicon, the electrical property of the battery piece can be ensured, and the output power of the battery piece can be ensured.
According to some embodiments of the utility model, it is a plurality of the material of the part of vice grid line that is located in the second conductive film zone is silver thick liquid, and is a plurality of the material of the part of vice grid line that is located in the first conductive film zone is silver-clad copper thick liquids.
According to the utility model discloses a some embodiments, it is a plurality of vice grid line includes: the middle part of each first secondary grid line is positioned in the first conductive film region, and two ends of each first secondary grid line are positioned in the second conductive film region.
According to some embodiments of the utility model, it is a plurality of vice grid line still includes: at least one second auxiliary grid line, the whole second auxiliary grid line is located in the second conducting film region.
According to some embodiments of the present invention, the second pair of grid lines is a plurality of, a plurality of the second pair of grid lines is located a plurality of respectively the edge of first pair of grid line the both sides of second direction.
According to some embodiments of the invention, each of the secondary grid lines has a width W of a portion thereof located within the second conductive film region 1 Wherein, the W 1 Satisfies the following conditions: w is less than or equal to 20 mu m 1 ≤100μm。
According to some embodiments of the invention, each of the secondary grid lines has a width W of a portion thereof located within the first conductive film region 2 Wherein, the W 2 Satisfies the following conditions: w is less than or equal to 20 mu m 2 ≤100μm。
According to some embodiments of the present invention, the battery piece further comprises: and the auxiliary grid line is positioned between the first conductive film region and the second conductive film region.
According to some embodiments of the utility model, the material of supplementary grid line is silver thick liquid or silver-clad copper thick liquids.
According to some embodiments of the invention, the second conductive film region has a width W 3 Wherein, the W 3 Satisfies the following conditions: w is not less than 0.5mm 3 ≤5mm。
According to some embodiments of the invention, an edge of the conductive film and an edge of the body are spaced apart from each other.
According to some embodiments of the invention, the distance between the edge of the conductive film and the edge of the body is L, wherein L satisfies: l is more than or equal to 0.4mm and less than or equal to 1.0 mm.
According to the utility model discloses photovoltaic module of second aspect embodiment, include according to the utility model discloses above-mentioned battery piece of first aspect embodiment.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is a schematic diagram of a battery cell according to an embodiment of the present invention;
fig. 2 is a schematic view of a cell sheet according to another embodiment of the present invention, wherein the secondary grid lines are not shown;
FIG. 3 is an enlarged view of portion A circled in FIG. 2;
fig. 4 is a schematic diagram of a battery cell according to another embodiment of the present invention, wherein the bus bars are not shown.
Reference numerals:
100: a battery piece;
1: a body; 2: a conductive film; 21: a first conductive film region; 22: a second conductive film region;
3: a main gate line; 4: a secondary gate line; 41: a first sub gate line; 42: a second sub-gate line;
5: and an auxiliary gate line.
Detailed Description
A battery sheet 100 according to an embodiment of the first aspect of the present invention is described below with reference to fig. 1 to 4. The cell 100 may be a heterojunction cell (a special PN junction formed by sequentially depositing two or more different thin films of semiconductor materials having different band gaps, such as gallium arsenide or silicon-germanium semiconductor alloy, on the same substrate). In the following description of the present application, the cell 100 is exemplified as a heterojunction cell.
As shown in fig. 1 to 4, a battery sheet 100 according to an embodiment of the present invention includes a body 1, a conductive film 2, a plurality of main grid lines 3, and a plurality of sub-grid lines 4. In the description of the present invention, "a plurality" means two or more.
Specifically, the conductive film 2 is provided on at least one side surface of the body 1, the conductive film 2 includes a first conductive film region 21 and a second conductive film region 22, and the second conductive film region 22 is located on the outer peripheral side of the first conductive film region 21. A plurality of bus bars 3 are provided on a side of the conductive film 2 away from the body 1, the plurality of bus bars 3 are spaced apart from each other in a first direction (e.g., a left-right direction in fig. 1), and each bus bar 3 extends in a second direction (e.g., an up-down direction in fig. 1) perpendicular to the first direction. The plurality of finger lines 4 are arranged at intervals in the second direction, each finger line 4 extends in the first direction, and a material of a portion of the plurality of finger lines 4 located in the second conductive film region 22 is different from a material of a portion of the plurality of finger lines 4 located in the first conductive film region 21.
For example, in the example of fig. 1 to 4, the conductive film 2 may be provided on at least one side surface in the thickness direction of the body 1, the second conductive film region 22 may be annular in shape, and the first conductive film region 21 is located within the second conductive film region 22. The number of the bus bars 3 may be five, five bus bars 3 are uniformly spaced apart from each other in the first direction, eleven bus bars 4 are eleven, and eleven bus bars 4 are uniformly spaced apart from each other in the second direction. Therefore, by arranging the conductive film 2, the plurality of main grid lines 3 and the plurality of auxiliary grid lines 4 on the body 1, the current generated by the body 1 through the photovoltaic effect can be transmitted to the plurality of auxiliary grid lines 4 through the conductive film 2, and the current on the plurality of auxiliary grid lines 4 can be led out through the plurality of main grid lines 3, so that the current of the battery piece 100, such as a heterojunction battery piece, can be led out.
Since the second conductive film region 22 is adjacent to the bare silicon region of the body 1, in order to avoid copper ions contacting silicon in the bare silicon region during printing, a material of a portion of the plurality of finger lines 4 located in the second conductive film region 22 may be a paste containing no copper, and a material of a portion of the plurality of finger lines 4 located in the first conductive film region 21 may be a paste containing copper. Therefore, compared with the traditional battery piece, the cost of the battery piece 100 such as a heterojunction battery piece is reduced, and meanwhile, copper ions can be prevented from entering silicon, so that the electrical performance of the battery piece 100 can be prevented from being reduced, and the output power of the battery piece 100 can be ensured.
Five main grid lines 3 and eleven secondary grid lines 4 are shown in fig. 1 for illustrative purposes, but it is obvious that a person skilled in the art can understand that the scheme is applied to other numbers of main grid lines 3 and secondary grid lines 4 after reading the technical scheme of the present application, and the invention also falls into the protection scope of the present invention.
According to the battery piece 100 of the embodiment of the present invention, for example, a heterojunction battery piece, by making the material of the portion of the plurality of sub-gate lines 4 located in the second conductive film region 22 different from the material of the portion of the plurality of sub-gate lines 4 located in the first conductive film region 21. Therefore, when the cost of the battery piece 100 is reduced, copper ions can be prevented from entering silicon, so that the electrical property of the battery piece 100 can be ensured, and the output power of the battery piece 100 can be ensured.
According to some embodiments of the present invention, the material of the portion of the plurality of sub-gate lines 4 located in the second conductive film region 22 is silver paste, and the material of the portion of the plurality of sub-gate lines 4 located in the first conductive film region 21 is silver-clad copper paste. Referring to fig. 1, two of the plurality of sub-gate lines 4 located at two ends in the second direction are located in the second conductive film region 22, in which case, the material of the two sub-gate lines 4 may be silver paste, and portions located at two ends in the first direction of the plurality of sub-gate lines 4 between the two sub-gate lines 4 are located in the second conductive film region 22, in which case, the portions located at two ends in the first direction of the plurality of sub-gate lines 4 are silver paste. Therefore, the material of the part, located in the second conductive film region 22, of the plurality of sub-grid lines 4 is silver paste, so that copper ions can be prevented from entering silicon during printing, the electrical performance of the battery piece 100 is guaranteed, and the battery piece 100 has high output power. In addition, the material of the part of the plurality of secondary grid lines 4 located in the first conductive film region 21 is silver-coated copper paste, so that the cost of the battery piece 100 can be reduced.
According to some embodiments of the present invention, as shown in fig. 1, the plurality of sub-gate lines 4 includes a plurality of first sub-gate lines 41, a middle portion of each first sub-gate line 41 is located in the first conductive film region 21, and both ends of each first sub-gate line 41 are located in the second conductive film region 22. At this time, the material of the middle portion of the first sub-gate line 41 may be silver-clad copper paste, and the material of the two ends of the first sub-gate line 41 may be silver paste. By such an arrangement, the electrical performance of the battery piece 100 can be ensured, and the cost of the battery piece 100 can be reduced.
Further, as shown in fig. 1, the plurality of sub-gate lines 4 further includes at least one second sub-gate line 42, and the second sub-gate line 42 is entirely located in the second conductive film region 22. At this moment, the material of the second auxiliary grid line 42 can be silver paste, and in the printing process of the auxiliary grid line 4, even if a certain amount of deviation occurs during printing, the silver-coated copper paste can be guaranteed not to be printed in the bare silicon area of the body 1, so that the electrical performance of the battery piece 100 is guaranteed, and the output power of the battery piece 100 can be guaranteed.
Furthermore, there are a plurality of second sub-gate lines 42, and the plurality of second sub-gate lines 42 are respectively located at two sides of the plurality of first sub-gate lines 41 along the second direction. For example, in the example of fig. 1, there are two second sub-gate lines 42, nine first sub-gate lines 41, two second sub-gate lines 42 respectively located on both sides of the nine first sub-gate lines 41 in the second direction, and both the two second sub-gate lines 42 are entirely located within the second conductive film region 22. With this arrangement, the two second sub-gate lines 42 can block the copper ions in the first sub-gate line 41 from entering the bare silicon region of the body 1 through the second conductive film region 22.
In some alternative embodiments, the width of the portion of each finger 4 located in the second conductive film region 22 is W 1 Wherein W is 1 Satisfies the following conditions: w is less than or equal to 20 mu m 1 Less than or equal to 100 mu m. When W is 1 When the width of the part of each sub-grid line 4 in the second conductive film region 22 is smaller than 20 μm, the sub-grid line 4 is inconvenient to process; when W is 1 The width of each finger 4 in the second conductive film region 22 is larger than 100 μm, which increases the resistance of the cell 100 and thus reduces the output power of the cell 100. Thereby, by making W 1 Satisfies the following conditions: w is less than or equal to 20 mu m 1 Less than or equal to 100 mu m, on one hand, the processing of the secondary grid line 4 is convenient; on the other hand, the resistance of the battery piece 100 can be reduced, and the output power of the battery piece 100 can be increased.
In some alternative embodiments, the width of the portion of each finger 4 within the first conductive film region 21 is W 2 Wherein W is 2 Satisfies the following conditions: w is less than or equal to 20 mu m 2 Less than or equal to 100 mu m. When W 2 When the width of each secondary grid line 4 in the first conductive film area 21 is smaller than 20 μm, the processing of the secondary grid line 4 is inconvenient; when W is 2 The greater width of each finger 4 in the first conductive film region 21 increases the resistance of the cell 100, thereby reducing the output power of the cell 100 > 100 μm. Thereby, by making W 2 Satisfies the following conditions: w is less than or equal to 20 mu m 1 Less than or equal to 100 mu m, on one hand, the processing of the secondary grid line 4 is convenient; on the other hand, the resistance of the battery piece 100 can be reduced, and the output power of the battery piece 100 can be increased.
According to some embodiments of the present invention, the battery piece 100 further includes an auxiliary grid line 5, and the auxiliary grid line 5 is located between the first conductive film region 21 and the second conductive film region 22. Referring to fig. 1, the number of the auxiliary gate lines 5 is four, the four auxiliary gate lines 5 are respectively located on four sides of the first conductive film region 21, and the auxiliary gate lines 5 are used for auxiliary current transmission, so as to ensure that current of a portion, located in the second conductive film region 22, of the plurality of auxiliary gate lines 4 can be transmitted to the plurality of main gate lines 3, and ensure the output power of the battery slice 100.
Optionally, the auxiliary gate line 5 may be made of silver paste, so that the electrical performance of the auxiliary gate line 5 can be effectively ensured. Certainly, the material of the auxiliary grid line 5 may also be silver-clad copper paste, so that the cost of the battery piece 100 can be further reduced.
In some alternative embodiments, the second conductive film region 22 has a width W 3 Wherein W is 3 Satisfies the following conditions: w is not less than 0.5mm 3 Is less than or equal to 5 mm. When W is 3 When the width of the second conductive film region 22 is too small less than 0.5mm, the printing of the secondary grid lines 4 is affected, so that the production efficiency of the battery piece 100 is reduced, and meanwhile, the blocking of copper ions is reduced due to the fact that the conductive film 2 is lost in part of the second conductive film region 22, so that the copper ions enter a bare silicon region of the body 1; when W is 3 If the thickness is greater than 5mm, the width of the second conductive film region 22 is large, and the thickness of the conductive film 2 in the second conductive film region 22 is uneven, which may reduce the current transmission of the battery piece 100, and thus may reduce the output of the battery piece 100. Thus, when W 3 W is more than or equal to 0.5mm 3 When less than or equal to 5mm, the width of the second conductive film region 22 is suitable, so that copper ions can be effectively blocked, and the processing of the secondary grid lines 4 is facilitated, thereby improving the production efficiency of the battery piece 100 and improving the output power of the battery piece 100.
According to some embodiments of the present invention, the edge of the conductive film 2 and the edge of the body 1 are spaced apart from each other. So set up to leave certain space between the edge of guaranteeing the conducting film 2 and the edge of body 1 and be used for placing the support plate, cause the damage to conducting film 2 when avoiding the support plate installation.
In some optional embodiments, the distance between the edge of the conductive film 2 and the edge of the body 1 is L, where L satisfies: l is more than or equal to 0.4mm and less than or equal to 1.0 mm. When L is less than 0.4mm, the distance between the edge of the conductive film 2 and the edge of the body 1 is too small, so that the contact area between the carrier plate and the body 1 is too small, the carrier plate is inconvenient to mount, and the reliability between the carrier plate and the body 1 is affected; when L is greater than 1.0mm, the distance between the edge of the conductive film 2 and the edge of the main body 1 is too large, after the carrier board is mounted, bare silicon exists in a part between the edge of the conductive film 2 and the edge of the main body 1, and current generated by the bare silicon cannot be effectively led out, so that the output power of the battery piece 100 is reduced. Thus, by making L satisfy: l is more than or equal to 0.4mm and less than or equal to 1.0mm, the output power of the battery piece 100 can be ensured, the mounting of the support plate is convenient, and the support plate can be firmly fixed on the body 1.
According to the present invention, a photovoltaic module (not shown) includes a cell sheet 100 according to the above first aspect of the present invention.
According to the utility model discloses photovoltaic module, through adopting above-mentioned battery piece 100, both can reduce photovoltaic module's cost, can guarantee photovoltaic module's output again.
Other constructions and operations of photovoltaic modules according to embodiments of the present invention are known to those of ordinary skill in the art and will not be described in detail herein.
In the description of the present invention, it is to be understood that the terms "center", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "circumferential", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are merely for convenience of description and to simplify the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the invention.
In the description of the present application, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example.
While embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.
Claims (13)
1. A battery piece, comprising:
a body;
the conductive film is arranged on at least one side surface of the body and comprises a first conductive film area and a second conductive film area, and the second conductive film area is positioned on the outer periphery side of the first conductive film area;
the conductive film comprises a body, a plurality of main grid lines and a plurality of conductive films, wherein the conductive films are arranged on one sides of the body, the main grid lines are arranged at intervals along a first direction, and each main grid line extends along a second direction perpendicular to the first direction;
the plurality of the secondary grid lines are arranged at intervals along the second direction, each secondary grid line extends along the first direction, and the material of the part of the plurality of the secondary grid lines located in the second conductive film area is different from the material of the part of the plurality of the secondary grid lines located in the first conductive film area.
2. The cell of claim 1, wherein the plurality of secondary grid lines comprises:
and the middle part of each first sub grid line is positioned in the first conductive film region, and two ends of each first sub grid line are positioned in the second conductive film region.
3. The battery piece of claim 2, wherein the plurality of secondary grid lines further comprises:
at least one second auxiliary grid line, the whole second auxiliary grid line is located in the second conducting film region.
4. The battery piece of claim 3, wherein the second plurality of secondary grid lines are located on two sides of the first plurality of secondary grid lines along the second direction.
5. The battery piece of claim 1, wherein the portion of each finger line within the second conductive film region has a width W 1 Wherein, the W 1 Satisfies the following conditions: w is more than or equal to 20 mu m 1 ≤100μm。
6. The battery piece of claim 1, wherein the portion of each finger line within the first conductive film region has a width W 2 Wherein, the W 2 Satisfies the following conditions: w is less than or equal to 20 mu m 2 ≤100μm。
7. The battery piece of claim 1, further comprising:
and the auxiliary grid line is positioned between the first conductive film region and the second conductive film region.
8. The battery piece according to claim 7, wherein the material of the auxiliary grid line is silver paste.
9. The battery piece of claim 7, wherein the auxiliary grid lines are made of silver-clad copper paste.
10. The cell of claim 1, wherein the second conductive film region has a width W 3 Wherein, the W 3 Satisfies the following conditions: w is not less than 0.5mm 3 ≤5mm。
11. The battery piece according to any one of claims 1-10, wherein an edge of the conductive film and an edge of the body are spaced apart from each other.
12. The battery piece of claim 11, wherein a distance between an edge of the conductive film and an edge of the body is L, wherein L satisfies: l is more than or equal to 0.4mm and less than or equal to 1.0 mm.
13. A photovoltaic module comprising a cell sheet according to any one of claims 1 to 12.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123271690.9U CN217334102U (en) | 2021-12-20 | 2021-12-20 | Battery piece and photovoltaic module with same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123271690.9U CN217334102U (en) | 2021-12-20 | 2021-12-20 | Battery piece and photovoltaic module with same |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217334102U true CN217334102U (en) | 2022-08-30 |
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ID=82989374
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202123271690.9U Active CN217334102U (en) | 2021-12-20 | 2021-12-20 | Battery piece and photovoltaic module with same |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217334102U (en) |
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2021
- 2021-12-20 CN CN202123271690.9U patent/CN217334102U/en active Active
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