CN211858666U - PERC double-sided battery - Google Patents
PERC double-sided battery Download PDFInfo
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- CN211858666U CN211858666U CN202020538365.0U CN202020538365U CN211858666U CN 211858666 U CN211858666 U CN 211858666U CN 202020538365 U CN202020538365 U CN 202020538365U CN 211858666 U CN211858666 U CN 211858666U
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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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- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
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Abstract
The utility model discloses a PERC double-sided battery, it is a plurality of back grid line is horizontal interval distribution, back grid line is connected in turn by a plurality of back of the body silver grid lines and a plurality of back of the body aluminium grid line and is formed PERC double-sided battery's back structure. The utility model discloses double-sided battery openly adopts the design of no main bars, has reduced the use amount of silver thick liquid, and the back adopts new grid line structural design, only uses silver grid line at the bonding wire contact position at the battery back, all the other areas that do not contact with the bonding wire all adopt the aluminium grid line to make and obtain PERC double-sided battery, like this can greatly reduced the thick liquids cost of PERC battery.
Description
Technical Field
The utility model relates to a solar photovoltaic cell preparation and subassembly encapsulation manufacturing technical field specifically are a PERC double-sided battery.
Background
The packaging technology for reducing the production cost of the photovoltaic cell and improving the power of the assembly is the most effective method for improving the photovoltaic energy, wherein the method for reducing the use amount of slurry in the manufacturing process of the photovoltaic cell is one of the most direct methods for reducing the manufacturing cost of the photovoltaic cell.
At present, the design and manufacture of the PERC battery are calculated by matching with the traditional welding assembly packaging technology, and the welding process needs a welding surface with a certain area to be contacted with a welding wire, so that the welding requirement is met, and the cost of slurry of the photovoltaic battery is higher.
The front electrode structure of the solar cell with the authorization notice number CN 203312312U in the prior art comprises a frame and a cell front electrode, wherein the cell front electrode comprises main grid lines and auxiliary grid lines, the main grid lines are longitudinally distributed at intervals, the auxiliary grid lines are distributed with the main grid lines in a cross mode, the main grid lines are of an interrupted structure, each interrupted main grid line is connected through a welding wire, and auxiliary grid lines parallel to the main grid lines are arranged between adjacent main grid lines.
However, the above electrode structure still has the following defects and problems in the technical aspects of saving raw materials and reducing cost, and a large amount of main grid silver paste can be consumed by adopting the arrangement mode of the main grid lines, so that the cost of the paste of the PERC battery is greatly increased.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a PERC double-sided battery to solve the problem that proposes among the above-mentioned background art.
In order to achieve the above object, the utility model provides a following technical scheme:
the PERC double-sided battery comprises a plurality of front grid lines arranged on the front side of the battery and a plurality of back grid lines arranged on the back side of the battery, wherein the back grid lines are distributed at intervals transversely, and the back grid lines are formed by alternately connecting a plurality of back silver grid lines and a plurality of back aluminum grid lines to form a back structure of the PERC double-sided battery.
Preferably, a printing overlapping region is arranged at the connection position of the back silver grid line and the back aluminum grid line.
Preferably, both ends of the back grid line are set as back aluminum grid lines.
Preferably, both ends of the back grid line are set as back silver grid lines.
Preferably, one end of the back grid line is set as a back silver grid line, and the other end of the back grid line is set as a back aluminum grid line.
Preferably, one side of the plurality of back grid lines is set to be back silver grid lines from top to bottom.
Preferably, one side of the plurality of back grid lines is arranged at intervals between the back silver grid line and the back aluminum grid line from top to bottom.
A method of making the PERC bifacial battery comprising the steps of:
1) a single polycrystalline silicon wafer is subjected to surface texturing to obtain a good textured structure;
2) cleaning residual liquid during the wool making;
3) reacting phosphorus oxychloride with the silicon wafer to obtain phosphorus atoms, wherein the phosphorus atoms enter the surface layer of the silicon wafer after a certain time and permeate and diffuse into the silicon wafer through gaps among the silicon atoms to form an interface of an N-type semiconductor and a P-type semiconductor;
4) etching and removing PN junctions at the edge through plasma etching, so as to avoid short circuit at the edge;
5) the diffusion junction making process can form a layer of phosphorosilicate glass on the surface of the silicon wafer, and the influence on the efficiency of the laminated tile battery is reduced through the phosphorosilicate glass removing process;
6) an aluminum oxide passivation layer with a certain thickness is laminated on the back surface of the battery in an ALD or PERC mode;
7) depositing one or more layers of silicon nitride antireflection films on the back surface, and completing the preparation of the antireflection films through a PECVD (plasma enhanced chemical vapor deposition) process;
8) depositing one or more layers of silicon nitride antireflection films on the front surface of the cell, and completing the silicon nitride antireflection films through a PECVD (plasma enhanced chemical vapor deposition) process;
further comprising:
9) carrying out laser grooving on the back of the battery, and carrying out laser processing on a corresponding position to obtain a positioning Marking point;
10) capturing and positioning a Marking point by using a CCD camera, and performing precision counterpoint printing on the back silver grid line through a printing screen and the positioning Marking point;
11) capturing a printed positioning Marking point by using two CCD cameras, performing precision contraposition printing on the back aluminum grid line by using two printing screen plates and the positioning Marking point, and ensuring that the back aluminum grid line and the back silver grid line are alternately connected;
12) and printing a front grid line on the front surface of the battery, and performing a sintering test.
A PERC double-sided battery component packaging process is used for the PERC double-sided battery and comprises the following steps:
1) one end of a metal welding wire is used for carrying out counterpoint interconnection with a back silver grid line of a battery, and the other end of the metal welding wire is interconnected with a front grid line of another battery;
2) connecting the positive electrode and the negative electrode of the battery piece in sequence to form a battery string, and typesetting and laminating the battery string;
3) and laminating the laminated battery strings, and framing and testing the laminated pieces to finish the assembly packaging and manufacturing.
Compared with the prior art, the beneficial effects of the utility model are that:
the utility model discloses solar cell openly adopts the design of no main bars, has reduced the use amount of silver thick liquid, and the back adopts new grid line design structure, only uses silver grid line at the bonding wire contact position at the battery back, all the other areas that do not contact with the bonding wire all adopt the aluminium grid line to make and obtain PERC double-sided battery, can greatly reduced the thick liquids cost of PERC battery like this, promote the conversion efficiency of battery simultaneously, and the utility model discloses a novel bonding wire interconnection packaging technology of PERC double-sided battery cooperation can promote the power of subassembly.
Drawings
Fig. 1 is a schematic structural view of a first embodiment of the middle back grid line of the present invention, in which two ends of the back grid line are both provided with back aluminum grid lines;
FIG. 2 is an enlarged view of the structure of area A in FIG. 1;
fig. 3 is a schematic structural view of a second embodiment of the present invention in which two ends of the middle back grid line are both set as back silver grid lines;
fig. 4 is a schematic structural diagram of a third embodiment of the present invention in which two ends of the middle back grid line are respectively set as a back silver grid line and a back aluminum grid line;
fig. 5 is a schematic structural diagram of a fourth embodiment of the present invention in which two ends of the middle back grid line are respectively set as a back silver grid line and a back aluminum grid line;
fig. 6 is a schematic view of a printed back silver grid line structure in the process of the double-sided battery manufacturing method of the present invention;
FIG. 7 is a schematic view of a printed aluminum-backed grid line structure during the manufacturing method of the double-sided battery of the present invention;
fig. 8 is a schematic view of the front grid line structure of the double-sided battery of the present invention;
fig. 9 is a schematic view of a connection structure of a metal bonding wire and a back silver grid line according to a first embodiment of the present invention;
FIG. 10 is an enlarged view of the structure of the area B in FIG. 9;
fig. 11 is a schematic view of a connection structure of a metal bonding wire and a grid line on the front surface of a battery.
In the figure: the method comprises the following steps of 1 front grid line, 2 back grid lines, 3 back silver grid lines, 4 back aluminum grid lines, 5 metal welding lines, 6 printing overlapping areas and 7 positioning Marking points.
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. 1-11, the present invention provides a technical solution:
the first embodiment is as follows: a PERC double-sided battery comprises a plurality of front grid lines 1 arranged on the front side of the battery and a plurality of back grid lines 2 arranged on the back side of the battery, wherein the back grid lines 2 are distributed at intervals transversely, and the back grid lines 2 are formed by alternately connecting a plurality of back silver grid lines 3 and a plurality of back aluminum grid lines 4, so that a back structure of the PERC double-sided battery is formed, a printing overlapping area 6 is arranged at the joint of the back silver grid lines 3 and the back aluminum grid lines 4, the back silver grid lines 3 and the back aluminum grid lines 4 can be ensured to be better connected, and the back silver grid lines 3 which are adjacent up and down are connected through metal welding wires 5;
as shown in the attached drawing 1, two ends of the back grid line 2 are both provided with back aluminum grid lines 4, and two ends of the back grid line 2, which are in contact with the cell frame, are both provided with back aluminum grid lines 4, as shown in the attached drawing 9, the back silver grid lines 3 in the up-and-down direction are on the same vertical line and are used for being welded and connected by metal welding wires 5.
Example two: a PERC double-sided battery comprises a plurality of front grid lines 1 arranged on the front side of the battery and a plurality of back grid lines 2 arranged on the back side of the battery, wherein the back grid lines 2 are distributed at intervals transversely, the back grid lines 2 are formed by alternately connecting a plurality of back silver grid lines 3 and a plurality of back aluminum grid lines 4, a printing overlapping area 6 is arranged at the joint of the back silver grid lines 3 and the back aluminum grid lines 4, the back silver grid lines 3 and the back aluminum grid lines 4 can be ensured to be better connected, and the back silver grid lines 3 which are adjacent up and down are connected through metal welding wires 5;
as shown in the attached drawing 3 in the specification, two ends of the back grid line 2 are both set as back silver grid lines 3, two ends of the back grid line 2, which are in contact with the battery piece frame, are both back silver grid lines 3, and the back silver grid lines 3 in the up-down direction are positioned on the same vertical line and are used for welding and connecting metal welding wires 5.
Example three: a PERC double-sided battery comprises a plurality of front grid lines 1 arranged on the front side of the battery and a plurality of back grid lines 2 arranged on the back side of the battery, wherein the back grid lines 2 are distributed at intervals transversely, the back grid lines 2 are formed by alternately connecting a plurality of back silver grid lines 3 and a plurality of back aluminum grid lines 4, a printing overlapping area 6 is arranged at the joint of the back silver grid lines 3 and the back aluminum grid lines 4, the back silver grid lines 3 and the back aluminum grid lines 4 can be ensured to be better connected, and the back silver grid lines 3 which are adjacent up and down are connected through metal welding wires 5;
as shown in the attached drawing 4, one end of the back grid line 2 is set as a back silver grid line 3, the other end of the back grid line is set as a back aluminum grid line 4, the back grid line 2 is in contact with the frame of the battery piece, one end of the back silver grid line 3 is set as the back silver grid line, the other end of the back aluminum grid line 4 is set as the back aluminum grid line 4, the left sides of the back grid lines 2 are all set as the back silver grid line 3 from top to bottom, the right side of the back grid line 2 and the connecting end of the frame are both set as the back aluminum grid line 4, and the back silver grid lines 3 in.
Example four: a PERC double-sided battery comprises a plurality of front grid lines 1 arranged on the front side of the battery and a plurality of back grid lines 2 arranged on the back side of the battery, wherein the back grid lines 2 are distributed at intervals transversely, the back grid lines 2 are formed by alternately connecting a plurality of back silver grid lines 3 and a plurality of back aluminum grid lines 4, a printing overlapping area 6 is arranged at the joint of the back silver grid lines 3 and the back aluminum grid lines 4, the back silver grid lines 3 and the back aluminum grid lines 4 can be ensured to be better connected, and the back silver grid lines 3 which are adjacent up and down are connected through metal welding wires 5;
as shown in the attached drawing 5 of the specification, one end of a back grid line 2 is set as a back silver grid line 3, the other end of the back grid line is set as a back aluminum grid line 4, the back grid line 2 is in contact with a cell frame at two ends, one end of the back grid line is the back silver grid line 3, the other end of the back grid line is the back aluminum grid line 4, one side of the back grid line 2 is arranged at intervals between the back silver grid line 3 and the back aluminum grid line 4 from top to bottom, the right side or the left side of the back grid line 2 and a connecting end of the frame are the back silver grid line 3 and the back aluminum grid line 4 which are sequentially and alternately arranged, the adjacent back silver grid lines 3 in the up and down.
A method of making a PERC bifacial battery comprising the steps of:
1) a single polycrystalline silicon wafer is subjected to surface texturing to obtain a good textured structure, so that the specific surface area is increased, more photons and energy can be received, and the reflection of incident light is reduced;
2) the residual liquid during the texturing is cleaned, so that the influence of acidic and alkaline substances on the battery knot making is reduced;
3) phosphorus atoms are obtained by reacting phosphorus oxychloride with the silicon wafer, and after a certain period of time, the phosphorus atoms enter the surface layer of the silicon wafer and permeate and diffuse into the silicon wafer through gaps among the silicon atoms to form an interface of an N-type semiconductor and a P-type semiconductor, thereby completing the diffusion and junction making process, realizing the conversion from light energy to electric energy and increasing the SE process flow;
4) because the diffusion junction forms a short circuit channel at the edge of the silicon wafer, photo-generated electrons collected by the front surface of the PN junction flow to the back surface of the PN junction along the region with phosphorus diffused at the edge to cause short circuit, the PN junction at the edge is etched and removed through plasma etching, and the edge is prevented from causing short circuit;
5) the diffusion junction making process can form a layer of phosphorosilicate glass on the surface of the silicon wafer, and the influence on the efficiency of the laminated tile battery is reduced through the phosphorosilicate glass removing process;
6) an aluminum oxide passivation layer with a certain thickness is laminated on the back surface of the battery in an ALD or PERC mode;
7) in order to protect the passivation layer, one or more layers of silicon nitride antireflection films are required to be deposited on the back surface, and the antireflection film preparation is completed through a PECVD (plasma enhanced chemical vapor deposition) working procedure;
8) reducing reflection, improving passivation, depositing one or more layers of silicon nitride antireflection films on the front surface of the cell, and completing the process through a PECVD chemical vapor deposition process;
9) according to the grid line graph of the back of the battery piece, carrying out laser grooving on the back of the battery, and carrying out laser processing on a corresponding position to obtain a positioning Marking point 7;
10) as shown in the attached figure 6 of the specification, a CCD camera is used for capturing and positioning a Marking point 7, and a back silver grid line 3 is printed in a precise alignment mode through a printing screen and the positioning Marking point 7;
11) as shown in the attached figure 7 of the specification, capturing a printed positioning Marking point 7 by using two CCD cameras, performing precision contraposition printing on a back aluminum grid line 4 by using two printing screen plates and the positioning Marking point 7, and ensuring that the back aluminum grid line 4 and a back silver grid line 3 are mutually connected in a printing way;
12) and printing a front grid line 1 on the front surface of the battery, and performing a sintering test.
A packaging process of a PERC double-sided battery assembly is used for a PERC double-sided battery and comprises the following steps:
1) as shown in the accompanying fig. 9 and 11 of the specification, one end of a metal bonding wire 5 is used for carrying out counterpoint interconnection with a back silver grid line 3 of a battery, and the other end of the metal bonding wire 5 is interconnected with a front grid line 1 of another battery;
2) connecting the positive electrode and the negative electrode of the battery piece in sequence to form a battery string, and typesetting and laminating the battery string;
3) and laminating the laminated battery strings, and framing and testing the laminated pieces to finish the assembly packaging and manufacturing.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (7)
1. The utility model provides a PERC double-sided battery, includes a plurality of positive grid lines (1) of setting at the battery is positive and sets up a plurality of back grid lines (2) at the battery back, its characterized in that: the back grid lines (2) are distributed at intervals transversely, and the back grid lines (2) are formed by alternately connecting a plurality of back silver grid lines (3) and a plurality of back aluminum grid lines (4) to form a back structure of the PERC double-sided battery.
2. The PERC double sided battery of claim 1, wherein: and a printing overlapping region (6) is arranged at the joint of the back silver grid line (3) and the back aluminum grid line (4).
3. The PERC double sided battery of claim 1, wherein: and two ends of the back grid line (2) are both provided with back aluminum grid lines (4).
4. The PERC double sided battery of claim 1, wherein: and two ends of the back grid line (2) are both provided with back silver grid lines (3).
5. The PERC double sided battery of claim 1, wherein: one end of the back grid line (2) is set to be a back silver grid line (3), and the other end of the back grid line is set to be a back aluminum grid line (4).
6. The PERC double sided battery of claim 5, wherein: one side of the back grid lines (2) is provided with back silver grid lines (3) from top to bottom.
7. The PERC double sided battery of claim 5, wherein: one side of the back grid lines (2) is arranged at intervals of the back silver grid lines (3) and the back aluminum grid lines (4) from top to bottom.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020538365.0U CN211858666U (en) | 2020-04-14 | 2020-04-14 | PERC double-sided battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020538365.0U CN211858666U (en) | 2020-04-14 | 2020-04-14 | PERC double-sided battery |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211858666U true CN211858666U (en) | 2020-11-03 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020538365.0U Active CN211858666U (en) | 2020-04-14 | 2020-04-14 | PERC double-sided battery |
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|---|---|
| CN (1) | CN211858666U (en) |
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2020
- 2020-04-14 CN CN202020538365.0U patent/CN211858666U/en active Active
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