CN210866213U - Double-sided battery and photovoltaic module with same - Google Patents
Double-sided battery and photovoltaic module with same Download PDFInfo
- Publication number
- CN210866213U CN210866213U CN201922325745.6U CN201922325745U CN210866213U CN 210866213 U CN210866213 U CN 210866213U CN 201922325745 U CN201922325745 U CN 201922325745U CN 210866213 U CN210866213 U CN 210866213U
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- double
- sided battery
- sided
- pad
- main grid
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- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims abstract description 22
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 22
- 239000010703 silicon Substances 0.000 claims abstract description 22
- 230000005684 electric field Effects 0.000 claims description 14
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical group [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 abstract description 16
- 229910052782 aluminium Inorganic materials 0.000 abstract description 16
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 abstract description 7
- 229910052709 silver Inorganic materials 0.000 abstract description 7
- 239000004332 silver Substances 0.000 abstract description 7
- 238000006243 chemical reaction Methods 0.000 abstract description 3
- 238000003466 welding Methods 0.000 abstract 2
- 229910000679 solder Inorganic materials 0.000 description 7
- 101100409194 Rattus norvegicus Ppargc1b gene Proteins 0.000 description 5
- 238000000034 method Methods 0.000 description 3
- 238000002161 passivation Methods 0.000 description 3
- 238000005476 soldering Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- NEIHULKJZQTQKJ-UHFFFAOYSA-N [Cu].[Ag] Chemical compound [Cu].[Ag] NEIHULKJZQTQKJ-UHFFFAOYSA-N 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- -1 silver-aluminum Chemical compound 0.000 description 1
- 238000013083 solar photovoltaic technology Methods 0.000 description 1
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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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- Photovoltaic Devices (AREA)
Abstract
The utility model discloses a double-sided battery and a photovoltaic module with the double-sided battery, wherein the double-sided battery comprises a silicon wafer and a back electrode arranged on the back of the silicon wafer, the back electrode comprises a plurality of main grids arranged at intervals, each main grid comprises a plurality of welding discs arranged at intervals and a connecting part connected between every two adjacent welding discs, and the width of the connecting part has the tendency of gradually increasing from the middle to both ends; the back surface of the double-sided battery of the utility model adopts the back electrode main grid to replace the aluminum main grid and silver electrode matched structure in the traditional double-sided battery, so that the double-sided battery has smaller series resistance in the application scene of a specific photovoltaic module; furthermore, the utility model discloses in the concrete design structure of related owner bars can also effectively reduce its sheltering from to the double-sided battery back photic area, and then can improve photovoltaic module's photoelectric conversion efficiency and two-sided rate in step.
Description
Technical Field
The utility model relates to a solar photovoltaic technology field especially relates to a double-sided battery and have this double-sided battery's photovoltaic module.
Background
A bifacial perc cell is a photovoltaic device that can receive light on both its front and back sides to produce an electric current. The photovoltaic module made of the double-sided perc battery can generate electricity on the back, so that the total generated energy can be greatly increased compared with a single-sided battery module. The back electric field on the back of the conventional double-sided perc battery usually comprises an aluminum wire and an aluminum main grid vertically connected with the aluminum wire, and when the double-sided assembly works, the current on the back of the double-sided perc battery is collected to the aluminum main grid through the aluminum wire and then is led out to a solder strip through a silver electrode electrically connected with the aluminum main grid. However, in the prior art, since the aluminum main grid has a higher resistivity, in order to avoid affecting the series resistance of the battery piece, the aluminum main grid generally needs to be provided with a larger width. The larger width of the aluminum main grid reduces the effective light receiving area of the back of the cell to the great extent, and further influences the cell efficiency and the double-side rate of the double-side assembly.
In view of the above, it is necessary to provide a technical solution to solve the above technical problems.
SUMMERY OF THE UTILITY MODEL
The utility model discloses aim at solving one of the technical problem that prior art exists at least, for realizing the utility model purpose of the aforesaid, the utility model provides a double-sided battery, its concrete design mode as follows.
The utility model provides a double-sided battery, includes the silicon chip and set up in the back electrode at the silicon chip back, the back electrode includes the main bars that a plurality of intervals set up, each the main bars include the pad that a plurality of intervals set up and connect in every two adjacent connecting portion between the pad, the width of connecting portion has and is the trend that the crescent by middle directional both ends.
Further, the width dimension range of the narrowest position in the middle of the connecting part is 30-50 μm, and the width dimension range of the widest position at the two ends of the connecting part is 100-300 μm.
Further, the pad is rectangular or circular.
Further, the maximum width dimension of the pad is not smaller than the maximum width dimension of the connection portion.
Furthermore, the bonding pad is rectangular, the width size range of the bonding pad is 0.3mm-3mm, and the length size range of the bonding pad is 0.5mm-20 mm.
Furthermore, the double-sided battery is also provided with a back electric field arranged on the back of the silicon wafer, the back electric field comprises a plurality of auxiliary grids which are arranged in parallel at intervals and have the extending directions vertical to the extending directions of the main grids, and the auxiliary grids are electrically connected to the main grids.
Furthermore, a blank area is reserved in the area where the pad is located by the back electric field.
Furthermore, the two sides of the pad in the width direction protrude outwards to form bulges, and the bulges are matched with the positions of the auxiliary grids connected to the pad.
Furthermore, the main grid is also provided with an extension part extending from the bonding pad at the end position of the main grid to the corresponding side edge of the silicon chip, and one end of the extension part close to the corresponding side edge of the silicon chip is forked in the extension direction to form a pair of oppositely arranged fork lines.
The utility model also provides a photovoltaic module, it has above double-sided battery.
The utility model has the advantages that: the back surface of the double-sided battery provided by the utility model adopts the back electrode main grid to replace the aluminum main grid and silver electrode matched structure in the traditional double-sided battery, and because the back electrode main grid usually adopts the silver grid with the resistivity far smaller than that of the traditional aluminum main grid, the double-sided battery has smaller series resistance in the application scene of the specific photovoltaic module; furthermore, the utility model discloses in the concrete design structure of related owner bars can also effectively reduce its sheltering from to the double-sided battery back photic area, and then can improve photovoltaic module's photoelectric conversion efficiency and two-sided rate in step.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is a schematic diagram showing the design structure of the back electrode of the double-sided battery of the present invention;
FIG. 2 is an enlarged view of a portion a of FIG. 1;
FIG. 3 is an enlarged schematic view of portion b of FIG. 1;
fig. 4 is a schematic diagram of a design structure of a double-sided battery back electric field according to the present invention;
fig. 5 is a schematic view showing a structure of the double-sided battery back electrode and the back electric field;
fig. 6 is an enlarged view of the portion c in fig. 5.
In the figure, 100 is a silicon wafer, 200 is a main gate, 21 is a bonding pad, 210 is a bump, 22 is a connecting part, 23 is an extending part, 230 is a branch line, 300 is a sub-gate, and 301 is a blank area.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
Referring to fig. 5, the double-sided battery provided by the present invention includes a silicon wafer 100 and a back electrode disposed on the back surface of the silicon wafer 100. Referring to fig. 1 and 2, the back electrode of the present invention includes a plurality of main grids 200 disposed at intervals, each main grid 200 includes a plurality of pads 21 disposed at intervals and a connecting portion 22 connected between every two adjacent pads 21, wherein the width of the connecting portion 22 has a tendency of gradually increasing from the middle to both ends.
In the specific implementation process, the back electrode 13 may be specifically set as an electrode with a resistivity smaller than that of the conventional aluminum main grid, such as a silver electrode, a silver-aluminum electrode, a copper electrode, and a silver-copper electrode.
The utility model also provides a photovoltaic module of above related double-sided battery has.
In the specific implementation process, the back side of the double-sided battery replaces the structure of the aluminum main grid and the silver electrode matched in the traditional double-sided battery by adopting the back electrode main grid 200, and because the back electrode main grid 200 usually adopts the silver grid with the resistivity much smaller than that of the traditional aluminum main grid, the double-sided battery has smaller series resistance in the application scene of a specific photovoltaic module. Furthermore, the utility model discloses in the concrete design structure of related owner bars can also effectively reduce its sheltering from to the double-sided battery back photic area, and then can improve photovoltaic module's photoelectric conversion efficiency and two-sided rate in step.
In the utility model, the width d1 size range of the narrowest position in the middle of the connecting part 22 is 30 μm to 50 μm, and the width d2 size range of the widest position at the two ends of the connecting part 22 is 100 μm to 300 μm.
In this embodiment, the pads 21 concerned are rectangular in shape with a width dimension d3 in the range 0.3mm-3mm and a length dimension in the range 0.5mm-20 mm.
In other embodiments of the present invention, the pad 21 may be configured as a circle, a triangle, or other polygons, and the maximum width dimension thereof is generally not less than the maximum width dimension d2 of the connection portion 22. It will be appreciated that the solder pads 21 are mainly used for soldering with solder ribbons during assembly of the photovoltaic module, and the maximum width dimension thereof is usually not less than the maximum width dimension d2 of the connecting portion 22, so as to ensure reliable soldering tension between the solder ribbons and the double-sided battery.
Referring to fig. 5, the double-sided battery of the present invention further includes a back electric field disposed on the back surface of the silicon wafer 100, and as shown in fig. 4, the back electric field includes a plurality of sub-grids 300 disposed in parallel at intervals and having an extending direction perpendicular to the extending direction of the main grid 200, wherein the sub-grids 300 are electrically connected to the main grid 200. In a specific implementation, the sub-gate 300 constituting the back electric field is typically an aluminum wire.
When a specific photovoltaic module is operated, the current on the back surface of the specific photovoltaic module is collected by the auxiliary grid 300, then flows back to the main grid 200, and is transmitted to the solder strip by the main grid 200. It can be understood that, in the current transmission process, on each side of the middle point of each connecting portion 22, the portion of the connecting portion 22 close to the pad 21 has a larger current than the portion of the connecting portion away from the pad 21, the utility model discloses well connecting portion 22 width has and is the trend that gradually increases by the directional both ends in middle can be better to adapt to this current distribution mode.
As a preferred embodiment of the present invention, as shown in fig. 4 and 5, the back electric field according to the present embodiment has a blank space in the region where the pad 301 is located. That is, the sub-gate 300 does not extend to the inner region of the bonding pad 301, so that the bonding pad 301 has a relatively flat surface after being printed, sintered and molded, and a reliable bonding force between the solder strip and the bonding pad 301 after being soldered is ensured.
Further, as shown in fig. 3 and 6, the pad 21 in the present embodiment protrudes outward at both sides in the width direction to form a protrusion 210, wherein the protrusion 210 matches with the position of the sub-grid 300 connected to the pad 21. That is, each protrusion 210 forms a lap joint with the sub-gate 300 in a matching position, so that reliable connection between the sub-gate 300 and the bonding pad 21 can be ensured.
Referring to fig. 2, the main gate 200 according to the present embodiment further has an extension 23 extending from the pad 21 at an end position thereof toward a corresponding side edge of the silicon wafer 11, and an end of the extension 23 near the corresponding side edge of the silicon wafer 11 is bifurcated in an extending direction thereof to form a pair of oppositely disposed branch lines 230. As shown in the figure, in the present embodiment, a triangular region is substantially defined between the pair of branch lines 230 and the corresponding side edges of the silicon wafer 11, and the triangular region can effectively avoid the problem of cracking during the soldering of the solder strip in the assembly process of the specific photovoltaic module.
The double-sided battery in the present invention is preferably a Perc battery, and it can be understood that, although not shown in the figure, the back of the silicon wafer 100 is further provided with a passivation layer, a back electric field and a back electrode are both disposed at the back of the passivation layer, wherein, the back of the silicon wafer 100 is further provided with a groove which runs through the passivation layer for the direct electrical connection between the auxiliary grid 300 and the back of the silicon wafer 100.
It should be understood that although the present description refers to embodiments, not every embodiment contains only a single technical solution, and such description is for clarity only, and those skilled in the art should make the description as a whole, and the technical solutions in the embodiments can also be combined appropriately to form other embodiments understood by those skilled in the art.
The above list of details is only for the practical implementation of the present invention, and they are not intended to limit the scope of the present invention, and all equivalent implementations or modifications that do not depart from the technical spirit of the present invention should be included in the scope of the present invention.
Claims (10)
1. The utility model provides a double-sided battery, includes the silicon chip and set up in the back electrode at the silicon chip back, its characterized in that, the back electrode includes the main bars that a plurality of intervals set up, each the main bars include the pad that a plurality of intervals set up and connect in every two neighbours connecting portion between the pad, the width of connecting portion has and is the trend of crescent by directional both ends in the middle.
2. The double-sided battery according to claim 1, wherein the width dimension at the narrowest position in the middle of the connection part ranges from 30 μm to 50 μm, and the width dimension at the widest positions at both ends of the connection part ranges from 100 μm to 300 μm.
3. The double-sided battery of claim 1 or 2, wherein the land is rectangular or circular.
4. The double-sided battery of claim 3, wherein the pad maximum width dimension is not less than the connection portion maximum width dimension.
5. The bifacial battery of claim 4, wherein said pads are rectangular and have a width dimension in the range of 0.3mm to 3mm and a length dimension in the range of 0.5mm to 20 mm.
6. The double-sided battery of claim 1 or 2, further comprising a back electric field disposed on the back surface of the silicon wafer, wherein the back electric field comprises a plurality of sub-grids disposed in parallel and spaced apart from each other and extending in a direction perpendicular to the extending direction of the main grid, and the sub-grids are electrically connected to the main grid.
7. The double-sided battery of claim 6, wherein the back electric field is provided with a blank area in the region where the pad is located.
8. The double-sided battery according to claim 7, wherein the land protrudes outward on both sides in the width direction to form a protrusion that matches a position where a sub-grid connected to the land is located.
9. The double-sided battery according to claim 1 or 2, wherein the main grid further has an extension portion extending from the bonding pad at an end position thereof toward the respective side edge of the silicon wafer, and an end of the extension portion near the respective side edge of the silicon wafer is bifurcated in an extending direction thereof to form a pair of oppositely disposed bifurcation lines.
10. A photovoltaic module having a bifacial cell according to any one of claims 1-9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922325745.6U CN210866213U (en) | 2019-12-23 | 2019-12-23 | Double-sided battery and photovoltaic module with same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922325745.6U CN210866213U (en) | 2019-12-23 | 2019-12-23 | Double-sided battery and photovoltaic module with same |
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| Publication Number | Publication Date |
|---|---|
| CN210866213U true CN210866213U (en) | 2020-06-26 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201922325745.6U Active CN210866213U (en) | 2019-12-23 | 2019-12-23 | Double-sided battery and photovoltaic module with same |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111916509A (en) * | 2020-09-08 | 2020-11-10 | 天合光能股份有限公司 | Back electrode pattern structure of crystalline silicon solar cell |
| CN112531039A (en) * | 2020-11-19 | 2021-03-19 | 晶澳（扬州）太阳能科技有限公司 | Back electrode of double-sided battery and double-sided battery |
| CN113410327A (en) * | 2020-12-07 | 2021-09-17 | 通威太阳能（成都）有限公司 | SE double-sided PERC battery adopting MBB main grid structure and preparation method thereof |
| CN114551605A (en) * | 2020-11-24 | 2022-05-27 | 苏州阿特斯阳光电力科技有限公司 | Preparation method of solar cell and solar cell |
-
2019
- 2019-12-23 CN CN201922325745.6U patent/CN210866213U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111916509A (en) * | 2020-09-08 | 2020-11-10 | 天合光能股份有限公司 | Back electrode pattern structure of crystalline silicon solar cell |
| CN112531039A (en) * | 2020-11-19 | 2021-03-19 | 晶澳（扬州）太阳能科技有限公司 | Back electrode of double-sided battery and double-sided battery |
| CN114551605A (en) * | 2020-11-24 | 2022-05-27 | 苏州阿特斯阳光电力科技有限公司 | Preparation method of solar cell and solar cell |
| CN113410327A (en) * | 2020-12-07 | 2021-09-17 | 通威太阳能（成都）有限公司 | SE double-sided PERC battery adopting MBB main grid structure and preparation method thereof |
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| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CP01 | Change in the name or title of a patent holder |
Address after: No. 199, deer mountain road, Suzhou high tech Zone, Jiangsu Province Patentee after: CSI Cells Co.,Ltd. Patentee after: Atlas sunshine Power Group Co.,Ltd. Address before: No. 199, deer mountain road, Suzhou high tech Zone, Jiangsu Province Patentee before: CSI Cells Co.,Ltd. Patentee before: CSI SOLAR POWER GROUP Co.,Ltd. |
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| CP01 | Change in the name or title of a patent holder |