CN111370503B - Solar cell and solar cell module - Google Patents

Solar cell and solar cell module Download PDF

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Publication number
CN111370503B
CN111370503B CN201811593953.8A CN201811593953A CN111370503B CN 111370503 B CN111370503 B CN 111370503B CN 201811593953 A CN201811593953 A CN 201811593953A CN 111370503 B CN111370503 B CN 111370503B
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China
Prior art keywords
solar cell
main body
flow guide
main
water conservancy
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CN201811593953.8A
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CN111370503A (en
Inventor
李兵
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Funing Atlas Sunshine Power Technology Co Ltd
CSI Cells Co Ltd
Canadian Solar Inc
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Funing Atlas Sunshine Power Technology Co Ltd
CSI Cells Co Ltd
Atlas Sunshine Power Group Co Ltd
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Priority to CN201811593953.8A priority Critical patent/CN111370503B/en
Publication of CN111370503A publication Critical patent/CN111370503A/en
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L31/00—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
    • H01L31/02—Details
    • H01L31/0224—Electrodes
    • H01L31/022408—Electrodes for devices characterised by at least one potential jump barrier or surface barrier
    • H01L31/022425—Electrodes for devices characterised by at least one potential jump barrier or surface barrier for solar cells
    • H01L31/022441—Electrode arrangements specially adapted for back-contact solar cells
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L31/00—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
    • H01L31/04—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof adapted as photovoltaic [PV] conversion devices
    • H01L31/042—PV modules or arrays of single PV cells
    • H01L31/05—Electrical interconnection means between PV cells inside the PV module, e.g. series connection of PV cells
    • H01L31/0504—Electrical interconnection means between PV cells inside the PV module, e.g. series connection of PV cells specially adapted for series or parallel connection of solar cells in a module
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L31/00—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
    • H01L31/04—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof adapted as photovoltaic [PV] conversion devices
    • H01L31/042—PV modules or arrays of single PV cells
    • H01L31/05—Electrical interconnection means between PV cells inside the PV module, e.g. series connection of PV cells
    • H01L31/0504—Electrical interconnection means between PV cells inside the PV module, e.g. series connection of PV cells specially adapted for series or parallel connection of solar cells in a module
    • H01L31/0516—Electrical interconnection means between PV cells inside the PV module, e.g. series connection of PV cells specially adapted for series or parallel connection of solar cells in a module specially adapted for interconnection of back-contact solar cells
    • 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

Abstract

The invention discloses a solar cell and a solar cell module, wherein the solar cell is provided with a front surface and a back surface, the back surface is provided with a plurality of back electrodes, each back electrode comprises a main body connected with a welding strip, the main body extends lengthwise and is provided with a main body central line, each back electrode comprises a first end and a second end which are positioned on the main body central line, and each back electrode also comprises a flow guide part connected with the main body. Therefore, partial current can directly flow to the electrode main body through the flow guide part to assist the main grid to collect current together, so that the series resistance is reduced, and the efficiency of the battery piece is improved.

Description

Solar cell and solar cell module
Technical Field
The invention relates to a solar cell and a solar cell module, and belongs to the technical field of solar power generation.
Background
The back silver electrode (back electrode for short) of a conventional solar cell sheet usually adopts a segmented back electrode, that is, each row of back electrodes is averagely divided into a plurality of segments, the length of each segment is the same, and the distance between each segment is the same. Usually, there is 0.5 ~ 2 mm's space between back electrode and the main bars for slow down that there is the difference in height in juncture, avoid causing the welding bad and the lower circumstances of taking the pulling force of welding in module welding process, along with the continuous improvement to two-sided battery back efficiency requirement, the main bars constriction is one of the direction of optimizing, but back electrode and main bars space department both sides tend to constrict, lead to the cluster to hinder and rise, influence the current collection.
Disclosure of Invention
The invention aims to provide a solar cell, which can improve the current collection efficiency.
In order to achieve the above object, the present invention provides a solar cell having a front surface and a back surface, wherein the back surface has a plurality of back electrodes, each back electrode includes a main body for connecting to a solder strip, the main body extends lengthwise and has a main body center line, each back electrode includes a first end and a second end located on the main body center line, and the back electrode further includes a flow guiding portion connected to the main body.
As a further improvement of an embodiment of the present invention, the flow guide part is symmetrically disposed with respect to a center line of the main body.
As a further improvement of an embodiment of the present invention, the flow guide portion includes a head flow guide portion connected to the first end, the first end and the head flow guide portion form a U-shaped or V-shaped structure, the head flow guide portion includes a pair of vertical flow guide arms connected to the first end, and a first margin area where no aluminum paste or silver paste is printed is formed between the pair of vertical flow guide arms.
As a further improvement of an embodiment of the present invention, the head guide portion further includes a horizontal guide arm connected to the vertical guide arm, and the horizontal guide arm extends toward the center line position of the main body.
As a further improvement of an embodiment of the present invention, the flow guiding portion includes a tail flow guiding portion connected to the second end, the second end and the tail flow guiding portion form a U-shaped or V-shaped structure, the tail flow guiding portion includes a pair of vertical flow guiding arms parallel to a central line of the main body, a second white region without printing aluminum paste or silver paste is also formed between the two vertical flow guiding arms, and an area of the second white region is smaller than an area of the first white region.
As a further improvement of an embodiment of the present invention, the back surface is further provided with a plurality of mutually parallel main grids and a plurality of sub-grid lines connected to the main grids, the back electrodes are arranged on the main grids and are uniformly distributed, and the arrangement directions of two adjacent back electrodes on the same main grid are opposite.
As a further improvement of an embodiment of the present invention, the back electrode adjacent to the edge of the solar cell sheet has a head flow guide portion disposed toward the edge of the solar cell sheet.
As a further improvement of an embodiment of the present invention, the flow guide portion includes a head flow guide portion connected to the first end and a tail flow guide portion connected to the second end, and the head flow guide portion has a shape different from that of the tail flow guide portion.
As a further improvement of an embodiment of the present invention, the main body includes a plurality of first main body portions and second main body portions sequentially connected at intervals, the flow guiding portions are disposed on two sides of the first main body portion and are in a zigzag shape, and the width of the second main body portion is uniform and constant.
Compared with the prior art, the invention has the beneficial effects that: partial current can directly flow to the electrode main body through the diversion part to assist the main grid to collect current together, thereby reducing series resistance and improving the efficiency of the battery piece.
Another object of the present invention is to provide a solar cell module, which includes the solar cell sheet as described above.
Compared with the prior art, the invention has the beneficial effects that: because the efficiency of the cell is improved, the efficiency of the solar cell module is also improved.
Drawings
Fig. 1 is a partial front view of the back side of a battery sheet according to a first embodiment of the present invention;
FIG. 2 is a front view of the back electrode of the cell shown in FIG. 1;
FIG. 3 is an enlarged view of a portion of the cell shown in FIG. 1;
fig. 4 is a partially enlarged view of a battery cell provided in a second embodiment of the present invention.
Some embodiments of the invention will be described in detail hereinafter, by way of illustration and not by way of limitation, with reference to the accompanying drawings. The same or similar parts or portions are denoted by the same reference numerals in the drawings. It will be appreciated by those skilled in the art that the drawings are not necessarily to scale, such that certain dimensions of structures or parts may be exaggerated relative to other structures or parts as appropriate for ease of illustration, and thus the drawings are intended to illustrate only the basic structure of the subject matter of the present application.
Detailed Description
The present invention will be described in detail below with reference to specific embodiments shown in the drawings. These embodiments are not intended to limit the present invention, and structural, methodological, or functional changes made by those skilled in the art according to these embodiments are included in the scope of the present invention.
It is to be understood that, in the description of the present invention, the terms "upper", "lower", "left" and "right" are referred to corresponding positions of the battery cell and the back electrode shown in the drawings. These terms indicating orientation or positional relationship, including but not limited to "upper", "lower", "left" and "right", are for convenience of description only and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present invention.
Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature.
In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween.
Fig. 1 to 3 show a battery cell 200 according to a first embodiment of the present invention.
Referring to fig. 1, in a cell 200 of a solar cell according to an embodiment of the present invention, a back surface of the cell 200 includes a plurality of sub-grid lines 300 for collecting current, and a main grid 400 connected to the sub-grid lines 300 for collecting current on the plurality of sub-grid lines 300, the plurality of sub-grid lines 300 are arranged in parallel at intervals, the plurality of main grids 400 are arranged in parallel at intervals, the main grid 400 is perpendicular to the sub-grid lines 300, a plurality of back electrodes 100 are disposed on the main grid 400, and the plurality of back electrodes 100 are uniformly distributed on the main grid 400 at intervals.
A plurality of back electrodes 100 are connected by solder strips 700, and the solder strips 700 can be connected with another cell sheet 200 to form a solar cell module. Therefore, the current collected by the sub-grid line 300 flows to the main grid 400, the back electrode 100, the solder strip 700 and the other cell … … in sequence, so as to complete the current collection, and the description is omitted.
In this embodiment, the sub-gate lines 300 and the main gate 400 are formed by printing aluminum paste, which is low in cost but poor in conductivity. The back electrode 100 is printed by silver paste, so that the back electrode 100 has better conductivity and higher cost.
Referring to fig. 1 and 2, in the preferred embodiment, the back electrode 100 includes a main body 120 connected to a solder strip 700.
In order to ensure the welding tension and reduce the offset of the welding strip 700 in the welding process, the length and the width of the main body 120 cannot be too small, but the silver paste consumption is increased and the cost is increased due to the increase of the length and the width.
In the present embodiment, it is preferable that the main body 120 has the weld-initiating portion 122 that is first connected to the welding strip 700 during welding, and the width of the weld-initiating portion 122 is greater than the width of the other portions of the main body 120.
That is to say, the back electrode 100 is widened at the position of the welding start part 122, and the other parts are relatively narrowed, so that the silver paste consumption can be reduced and the cost of the battery piece 200 can be reduced while the welding tension is ensured and the deviation of the welding strip 700 is reduced.
In this embodiment, the main body 120 extends lengthwise, and the main body 120 includes a first end 131 and a second end 132 spaced apart from each other in an extending direction thereof, and a first side and a second side connecting both side edges of the first end 131 and the second end 132. That is, the main body 120 has four edges, i.e., a first end 131, a second end 132, a first side, and a second side.
In the present embodiment, the weld-starting portion 122 is close to the first end 131 of the main body 120, and therefore, in the present embodiment, the width of the first end 131 of the main body 120 is greater than the width of the second end 132 and is also greater than the width of other portions of the main body 120.
The body 120 has a body centerline X. The main part central line X is the central line on the main part 120 lengthwise extending direction, and whole main part 120 is the symmetrical design of main part central line X relatively, and the structure is regular to can be more balanced current collection, promote current collection efficiency.
In this embodiment, an even number of back electrodes 100 are disposed on the main gate 400, and two adjacent back electrodes 100 are symmetrically disposed with respect to a straight line perpendicular to the main gate 400. Alternatively, two adjacent back electrodes 100 are symmetrically disposed with respect to a line parallel to the sub-gate line 300. In this embodiment, the two back electrodes 100 adjacent to each other on the same main gate 400 are arranged in opposite directions. That is, the solder lifting portion 122 of one back electrode 100 faces upward, and the solder lifting portion of the adjacent back electrode 100 faces downward, or vice versa. In the present embodiment, the solder starting portion 122 of the back electrode 100 located at the head and tail positions is closer to the edge of the solar cell.
In this way, regardless of whether the battery piece 200 is a whole piece or the whole battery piece 200 is cut into two halves along a line perpendicular to the main grid 400 (or a line parallel to the minor grid line 300), the welding start part 122 with a wider width can be firstly contacted with the welding strip 700, thereby ensuring the welding tension and reducing the deflection of the welding strip 700 during the welding process.
Referring to fig. 1 and 3, the main gate 400 has a first margin 500 near the first end 131 of the main body 120 of the back electrode 100. The first margin 500 is rectangular, and the first margin 500 has a width equal to that of the first end 131. The main gate 400 has a second margin 600 at the second end 132 of the body 120 near the back electrode 100. The second margin 600 is rectangular, and the width of the second margin 600 is equal to the width of the second end 132.
The white space refers to that nothing is printed on the battery piece 200 at this position, the printed main grid 400 and the back electrode 100 have a certain thickness, and the thickness of the main grid 400 is greater than that of the back electrode 100, when the solder strip 700 is gradually pressed from the upper main grid 400 to the soldering start part 122 of the back electrode 100 near the first end 131, the first white space 500 allows the solder strip 700 to slowly descend from the thicker main grid 400 to be connected with the thinner back electrode 100, that is, the first white space 500 slows down the height difference between the main grid 400 and the back electrode 100, the contact between the solder strip 700 and the back electrode 100 can be increased, the solder strip 700 is prevented from being pulled too much, and the soldering quality is improved.
The second white space 600 can also relieve the height difference between the second end 132 of the back electrode 100 and the main grid 400, increase the contact between the solder strip 700 and the back electrode 100, avoid the too large tension of the solder strip 700, and improve the welding quality. And will not be described in detail.
The white space may improve the welding quality, but also causes a problem in that the main grid 400 is narrowed at the white space position where the current density is large, and the conductivity is inferior to that of the silver back electrode 100 due to the high resistivity of the aluminum main grid 400, and the current transmission resistance is large.
To solve this problem, the back electrode 100 of the present embodiment preferably further includes a flow guide part 150 connected to the body 120.
Therefore, partial current can directly flow to the electrode through the current guiding part 150 to assist the main grid 400 to collect current together, thereby reducing the series resistance and improving the efficiency of the battery piece 200.
In the present embodiment, the flow guide part 150 has a size smaller than that of the body 120. Specifically, the length and width of the current guide part 150 are much smaller than those of the main body 120, thereby achieving the effect of assisting in collecting current at low cost.
In this embodiment, the main body 120 is preferably symmetrically disposed with respect to the main body center line X, and the flow guide part 150 is also preferably symmetrically disposed with respect to the main body center line X.
The current guiding parts 150 are symmetrically arranged relative to the central line X of the main body, so that the back electrode 100 can uniformly collect current, and the efficiency of the battery piece 200 is improved.
In the present embodiment, the flow guide part 150 includes a head flow guide part 152 connected to the first end 131 of the body 120 and a tail flow guide part 154 connected to the second end 132 of the body 120, and the head flow guide part 152 and the tail flow guide part 154 have different shapes.
In this embodiment, the widths of the first and second blank regions 500 and 600 are different. Specifically, the width of the first margin 500 is greater than that of the second margin 600, and since the two margins 500/600 have different influence on current collection, the shape of the head guide 152 is different from that of the tail guide 154 to meet different requirements.
Preferably, the head deflector includes a vertical deflector arm 156 connected to the first end 131, and a horizontal deflector arm 158 connected to the vertical deflector arm 156.
In the present embodiment, "vertical" refers to a direction parallel to the center line X of the main body, and "horizontal" refers to a direction perpendicular to "vertical".
The vertical guide arms 156 and the horizontal guide arms 158 may better assist the main body 120 in collecting current, thereby improving the efficiency of the battery cell 200. In particular, in the present embodiment, the width of the first white space 500 is wider, the first white space 500 has a greater influence on the current collection, and the vertical guide arm 156 and the horizontal guide arm 158 can better reduce the influence of the wider first white space 500 on the current collection.
As mentioned above, the flow guiding portions 150 are symmetrically disposed with respect to the body center line X, and the head flow guiding portions 152 are also symmetrically disposed with respect to the body center line X. In the present embodiment, the number of the head guide portions 152 is two, and the two head guide portions 152 are symmetrically disposed with respect to the body center line X.
In this embodiment, the starting end of the horizontal guide arm 158 is connected to the end of the vertical guide arm 156, and the horizontal guide arm 158 extends in a direction close to the body center line X.
That is, the head deflector 152 on the right side of the body centerline X is substantially shaped like the numeral "7". The width of the back electrode 100 is not increased, the current can be collected better, and the efficiency of the cell 200 is improved.
In the present embodiment, the first end 131 and the head guide portion 152 form a U-shaped structure, but those skilled in the art may conceive that the first end 131 and the head guide portion 152 form a V-shaped structure.
In this embodiment, the two back electrodes 100 adjacent to each other on the same main gate 400 are arranged in opposite directions. That is, the head flow guide portion 152 of one back electrode 100 faces upward, and the head flow guide portion 152 of the adjacent back electrode 100 faces downward, or vice versa.
In the present embodiment, the head guide portion 152 of the back electrode 100 adjacent to the edge of the solar cell sheet 200 is provided toward the edge of the solar cell sheet 200.
As described above, the main gate 400 has the blank regions near the first and second ends 131 and 132 of the back electrode 100, and the flow guide part 150 preferably extends along the edges of the blank regions in the present embodiment. Specifically, the head deflector 152 extends along an edge of the first whitespace zone 500. The tail guide 154 extends along an edge of the second margin area 600.
Since the white space affects the current collection, the current guiding part 150 extends along the edge of the white space, which can improve the current collection to the maximum extent, thereby reducing the influence of the white space on the current collection to the maximum extent.
In this embodiment, the first lead-out white region is rectangular, the first end 131 of the back electrode 100 abuts against the lower side of the first lead-out white region 500, the vertical guide arms 156 of the two head guides 152 are respectively close to the two sides of the first lead-out white region 500, and the horizontal guide arms 158 of the two head guides 152 are close to the upper side of the first lead-out white region 500. That is, the head guide 152 extends from the first end 131 to the upper side of the first margin 500 along both sides of the first margin 500, and the upper central portion of the first margin 500 directly abuts the main gate 400.
Preferably, in this embodiment, one-half of the length of the first blanking area 500 is greater than the length of the horizontal deflector arm 158. Thus, the main grid 400 rather than the horizontal deflector arm 158 is adjacent to the upper central portion of the first whitespace 500. That is, the two horizontal guiding arms 158 do not cover all the upper edges of the first blanking area 500, so as to prevent the main body 120 and the head guiding portion 152 of the back electrode 100 from enclosing all the edges of the first blanking area 500, and finally prevent the first blanking area 500 from not playing a role in improving the welding quality.
Preferably, the aft deflector 154 is parallel to the body centerline X.
The tail current guiding portion 154 can also assist in collecting current, thereby improving the efficiency of the cell 200. In this embodiment, since the width of the second white space 600 is narrow, the main grid 400 is less affected by the second white space 600, the tail guiding portion 154 is parallel to the body center line X, the tail guiding portion 154 only extends along two side edges of the second white space 600, the extending length of the tail guiding portion 154 is short, but the effect of auxiliary current collection can be satisfied, and the short extending length can also reduce the cost of the back electrode 100. Thus, the trailing deflector 154 provides a reasonable balance between auxiliary current collection and cost reduction.
In this embodiment, the main body 120 has a first blank space 500 at the first end 131 and a second blank space at the second end 132, and accordingly, the flow guide part 150 includes a head flow guide part 152 and a tail flow guide part 154. It will be appreciated by those skilled in the art that a blank area and a corresponding flow guiding portion are only disposed at one end of the main body 120, and all the embodiments similar to or the same as the present embodiment are covered by the present invention.
In the present embodiment, the flow guide part 150 is integrally provided with the body 120. That is, the guide part 150 is printed together with the body 120 during the manufacturing process, and the manufacturing is convenient.
Referring to fig. 2 and 3, in the present embodiment, preferably, the main body 120 includes a plurality of first main body portions 161 and second main body portions 162 connected in sequence at intervals, and an area of the first main body portion 161 is larger than an area of the second main body portion 162.
In the present embodiment, "sequentially spaced-apart connected" means that the body 120 includes the first body portion 161, the second body portion 162, the first body portion 161, and the second body portion 162 … … connected sequentially so as to circulate. The structure is regular, and the silver paste consumption is reduced, so that the cost is reduced.
The area of the first body portion 161 is larger than that of the second body portion 162, so that the area of the second body portion 162 can be reduced, thereby reducing the consumption of silver paste for manufacturing the back electrode 100 and reducing the cost of the battery piece 200.
In the present embodiment, the length and width of the first body portion 161 are greater than those of the second body portion 162, so that the area of the first body portion 161 is greater than that of the second body portion 162.
Preferably, in this embodiment, the area of each first body portion 161 gradually decreases in a direction away from the first end 131. Therefore, the consumption of silver paste for manufacturing the back electrode 100 can be reduced, and the cost of the battery piece 200 can be reduced. Moreover, the area of each first body portion 161 is reduced "gradually", so that the current collection can be more balanced and stable, and the efficiency of the battery piece 200 can be improved.
As mentioned above, the soldering start part 122 is disposed near the first end 131 of the main body 120, and the width of the first end 131 is greater than the width of the other parts of the main body 120, so as to reduce the consumption of silver paste while ensuring the soldering quality. Further, in the present embodiment, the area of each first main body 161 is gradually reduced along the direction away from the first end 131, i.e., the direction away from the soldering start portion 122, so that the silver paste consumption can be reduced while the soldering quality is ensured to the maximum extent.
In the present embodiment, the first body portions 161 are gradually reduced in area, but the first body portions 161 are identical in shape. The structure is regular, and the current can be collected more evenly, improves the efficiency of battery piece 200.
In this embodiment, the first main body 161 preferably has a square wave shape at its two edges, and the peak of the square wave forms the flow guiding portion 150.
That is, the flow guiding parts 150 are also disposed at the two side edges of the first body part 161 to assist in collecting current, thereby improving the efficiency of the battery cell 200.
In the present embodiment, both side edges of each first main body 161 are preferably square-wave shaped, and the peak connecting line 172 of each square wave is a straight line gradually approaching the center line X of the main body in the direction away from the first end 131 or the welding start portion 122. The peak connecting line 172 is not a line actually existing on the back electrode 100, but is a line which is assumed for better describing the structure of the back electrode 100 of the present embodiment.
The crest line 172 of each square wave is the straight line that is close to main part central line X gradually for the width of each first main part 161 reduces gradually, not only reduces silver thick liquid consumption, and, moreover, makes the width arithmetic of first main part 161 reduce, and the amplitude control that reduces is very good, avoids the collection of shape sudden change influence current, thereby promotes current collection efficiency, promotes battery piece 200 efficiency.
In the present embodiment, both side edges of each first main body 161 are preferably square-wave shaped, and a bottom connecting line 174 of each square wave is a straight line gradually approaching the center line X of the main body in a direction away from the first end 131 or the welding start portion 122. The bottom-wave connecting line 174 is not a line actually existing on the back electrode 100, but is a line which is assumed for better explanation of the structure of the back electrode 100 of the present embodiment.
The same effect as the peak connecting line 172 being a straight line gradually approaching the center line X of the main body, and the bottom connecting line 174 of each square wave being a straight line gradually approaching the center line X of the main body, not only reduces the consumption of silver paste, but also improves the efficiency of the cell 200. And will not be described in detail.
In summary, in the present embodiment, along the direction away from the first end 131 or the welding start portion 122, the crest connecting line 172 of each square wave is a straight line gradually approaching the body centerline X, and the bottom connecting line 174 of each square wave is a straight line gradually approaching the body centerline X, that is, the crest connecting line 172 and the bottom connecting line 174 are not parallel to the body centerline X, but have an included angle with the body centerline X.
In this embodiment, the width of the second main body 162 is slightly larger than that of the solder strip 700, so that the consumption of silver paste for manufacturing the back electrode 100 can be reduced to the greatest extent, and the cost of the battery piece 200 can be reduced.
In the present embodiment, preferably, the edge line of each second body portion 162 is parallel to the body center line X. Preferably, the area and shape of each second body portion 162 are the same. Preferably, the second main body 162 is rectangular to meet the requirement of minimum width, so that the consumption of silver paste for manufacturing the back electrode 100 can be reduced, and the cost of the battery piece 200 can be reduced.
In this embodiment, the body 120 of the back electrode 100 is preferably provided with a plurality of hollow portions 180.
The hollow portion 180 can reduce the consumption of silver paste in the process of manufacturing the back electrode 100, thereby reducing the cost of the battery cell 200.
Moreover, if the body 120 of the back electrode 100 does not have the hollow portion 180, in the process of contacting the solder ribbon 700 with the back electrode 100, the solder will spread to both sides along the length direction of the whole back electrode 100 after melting, so that the spreading amount of the solder per unit length will be reduced, the welding tension will be insufficient, and the reliability of welding will be affected finally. The hollowed-out portion 180 may roughen the surface of the body 120, thereby reducing spreading of solder, and improving welding relay and welding reliability.
In the present embodiment, the hollow parts 180 are preferably arranged at regular intervals over the entire area of the body 120.
This can minimize the cost of the battery cell 200, and improve the welding force and ensure the reliability of welding.
In the present embodiment, the center-to-center distance between two adjacent hollow-out portions 180 is preferably between 0.1 and 0.5 mm. Preferably between 0.15 and 0.3 mm.
The center-to-center distance in this range can reduce the cost of the battery sheet 200 to the maximum extent, and improve the welding relay and ensure the reliability of welding.
In the present embodiment, the shape of the hollow portion 180 is preferably one of circular, triangular, rectangular, and polygonal.
Thus, the shape of the hollow portion 180 may be selected as required, thereby facilitating the manufacture of the electrode.
In the present embodiment, the hollow portion 180 is preferably circular, and the diameter of the circular hollow portion 180 is between 0.03 and 0.2 mm.
As can be appreciated by those skilled in the art, the rounded hollow-out portion 180 has no sharp corners, which can improve the efficiency of the battery cell 200.
As described above, the back electrode 100 further includes the flow guiding portion 150 connected to the main body 120, and in the present embodiment, the flow guiding portion 150 is preferably provided with the hollow portion 180.
The hollow-out part 180 is arranged on the flow guide part 150, so that the current collection can be assisted, and the consumption of silver paste can be reduced, thereby reducing the cost of the battery piece 200.
In this embodiment, the silver paste consumption is reduced by providing the hollow portion 180 on the main body 120. In fact, in this embodiment, not only the silver paste consumption is reduced by providing the hollow portion 180 on the main body 120, as mentioned above, the main body 120 includes the first main body portion 161 and the second main body portion 162 which are sequentially connected at intervals, and the area of the second main body portion 162 is smaller than that of the first main body portion 161, which can also reduce the silver paste consumption; in a direction away from the first end 131, the area of each first body portion 161 gradually decreases, which may also reduce silver paste consumption; the edges of the two sides of each first main body part 161 are in a square wave shape, and the width of the wave bottom of the square wave edge relative to the wave peak is reduced, so that the silver paste consumption can be reduced.
Therefore, the battery piece 200 of the present embodiment can greatly reduce the consumption of silver paste, thereby greatly reducing the cost of the battery piece 200.
It should be noted that, in the present embodiment, the back electrode 100 of the PERC double-sided battery is taken as an example for description, but the back electrode 100 of the present embodiment is particularly suitable for the PERC double-sided battery except for the related features of the current guiding part 150, and other features of the back electrode 100, including but not limited to the square wave shape of the edge of the first main body part 161 and the provision of the hollow part 180 on the electrode, can also be used on a single-sided battery, so the technical features except the current guiding part 150 can also be used on other electrodes of the solar cell sheet 200, and are not limited to the back electrode 100. Any embodiments similar or equivalent to the embodiments are also within the scope of the present invention.
Fig. 4 shows a cell 202 and a back electrode 102 according to a second embodiment of the present invention.
The following description focuses on differences between the battery sheet 202 of the present embodiment and the battery sheet 200 of the first embodiment.
In this embodiment, the back electrode mounting portion 204 of the main grid 402 on which the back electrode 102 is mounted is defined, and the width of the back electrode mounting portion 204 is larger than the width of the other portion of the main grid 402.
Thus, the portion of the main grid 402 where the back electrode 102 is not mounted can be made narrower, thereby improving the cell efficiency.
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-listed detailed description is only a specific description of a possible embodiment of the present invention, and they are not intended to limit the scope of the present invention, and equivalent embodiments or modifications made without departing 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 solar wafer, its is equipped with front and back, the back is equipped with the main grid, is equipped with a plurality of back electrodes on the main grid, back electrode is including being used for with the main part that the solder strip is connected, main part lengthwise extension has the main part central line, back electrode is including being located first end and second end on the main part central line, its characterized in that: the back electrode further comprises a flow guide part connected with the main body; the water conservancy diversion portion include with the head water conservancy diversion portion that first end is connected, first end with head water conservancy diversion portion constitutes U type or V type structure, head water conservancy diversion portion include a pair of with the vertical water conservancy diversion arm that first end is connected, the main gate is formed with the first whitewashed district that leaves of not printing aluminium thick liquid and silver thick liquid between this a pair of vertical water conservancy diversion arm.
2. The solar cell sheet according to claim 1, wherein: the flow guide parts are symmetrically arranged relative to the central line of the main body.
3. The solar cell sheet according to claim 1, wherein: the main body is provided with a welding starting part which is firstly connected with the welding strip when the welding strip is welded, and the width of the welding starting part is larger than that of other parts of the main body.
4. The solar cell sheet according to claim 1, wherein: the head flow guide part further comprises a horizontal flow guide arm connected with the vertical flow guide arm, and the horizontal flow guide arm extends towards the center line of the main body.
5. The solar cell sheet according to claim 1, wherein: the water conservancy diversion portion include with the afterbody water conservancy diversion portion that the second end is connected, the second end with afterbody water conservancy diversion portion constitutes U type or V type structure, and it includes a pair of being on a parallel with the vertical water conservancy diversion arm of main part central line also is formed with the second of not printing aluminium thick liquid or silver thick liquid between this two vertical water conservancy diversion arms and leaves the white district, the area in second leaves the white district is less than the area in first area of leaving the white district.
6. The solar cell sheet according to claim 5, wherein: the back electrodes are uniformly distributed on the main grids, and the arrangement directions of two adjacent back electrodes on the same main grid are opposite.
7. The solar cell sheet according to claim 5, wherein: the head flow guide part of the back electrode adjacent to the edge of the solar cell piece faces the edge of the solar cell piece, and the width of the first end of the main body is larger than that of the second end.
8. The solar cell sheet according to claim 1, wherein: the flow guide part comprises a head flow guide part connected with the first end and a tail flow guide part connected with the second end, and the shape of the head flow guide part is different from that of the tail flow guide part.
9. The solar cell sheet according to claim 1, wherein: the main part includes a plurality of first main part and the second main part of interval connection in order, the water conservancy diversion portion is located the both sides limit of first main part just is the cockscomb structure, the width of second main part is even unchangeable, and the area of first main part is greater than the area of second main part, and along the direction of keeping away from first end, the area of each first main part reduces gradually.
10. A solar cell module, characterized in that: comprising a solar cell sheet according to any one of claims 1 to 9.
CN201811593953.8A 2018-12-25 2018-12-25 Solar cell and solar cell module Active CN111370503B (en)

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