CN215771180U - Pad of solar cell and solar cell - Google Patents
Pad of solar cell and solar cell Download PDFInfo
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- CN215771180U CN215771180U CN202121039814.8U CN202121039814U CN215771180U CN 215771180 U CN215771180 U CN 215771180U CN 202121039814 U CN202121039814 U CN 202121039814U CN 215771180 U CN215771180 U CN 215771180U
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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
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
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Abstract
The utility model is suitable for the field of solar cells, and provides a bonding pad of a solar cell, which comprises a bonding pad main body and a plurality of welding marks, wherein the welding marks are distributed in the bonding pad main body according to a set distribution mode. The utility model also provides a solar cell. According to the utility model, the welding marks distributed in a set distribution mode are arranged in the welding pad main body, so that more accurate weldable points are arranged between the welding pad and the welding strip, the tolerance of the solar cell to the deviation of the welding strip is increased, different solar cells can be accurately welded and connected in series according to the welding pad without increasing the number and the size of the welding pad, the area of a back passivation film corroded by back silver is not increased, the welding window of the back electrode is increased on the premise of ensuring the conversion efficiency of the solar cell, not increasing the wet weight of the back silver and not increasing the printing area of the back silver, the welding performance of the back electrode is improved, and the production cost and the power generation efficiency of the solar cell are ensured.
Description
Technical Field
The utility model belongs to the technical field of solar cells, and particularly relates to a bonding pad of a solar cell and the solar cell.
Background
A solar cell is a device that efficiently absorbs solar radiation energy and converts light energy into electric energy using the photovoltaic effect. When sunlight irradiates on a semiconductor P-N Junction (P-N Junction), a new hole-electron pair (V-E pbir) is formed, under the action of a P-N Junction electric field, holes flow from an N region to a P region, electrons flow from the P region to the N region, and current is formed after a circuit is switched on. The solid semiconductor device is also called a solar cell or a photovoltaic cell, and is an important component of a solar cell array power supply system because the solid semiconductor device converts solar energy into electric energy by utilizing the photovoltaic effect of various potential barriers.
The solar cell module gradually becomes a mainstream product in the photovoltaic market, the market value of the solar cell module is widely accepted by global customers, and the market share in the future is further improved. To promote further development of solar cells, it is possible to achieve by improving their power generation efficiency and reducing production costs. Along with the increasing demand for the power generation amount of the solar cell in the market, the size of the solar cell is continuously increased, the size of a silicon wafer of the solar cell is also continuously increased, and the requirement for the welding precision of the solar cell is also increased.
In the prior art, a welding strip is welded on a welding pad of a solar cell, each solar cell is welded and connected in series through the welding strip to form a solar cell module, and the welding pad can improve the welding tension between the solar cell and the welding strip, so that the reliability of the solar cell module is improved. Generally, the welding performance of the back electrode can be improved by increasing the number and size of the pads on the back electrode, and the increase in the number and size of the pads can reduce the area of the back electrode itself, and increase the area of the back passivation film corroded by the back silver on the back electrode, which not only increases the cost of the solar cell, but also reduces the power generation efficiency of the solar cell.
SUMMERY OF THE UTILITY MODEL
The embodiment of the utility model provides a welding pad of a solar cell, and aims to solve the technical problems that the welding performance of a back electrode is improved by increasing the number and the size of the welding pads on the back electrode of the solar cell in the prior art, so that the area of a back passivation film corroded by back silver on the back electrode is increased, the cost of the solar cell is increased, and the power generation efficiency is reduced.
The embodiment of the utility model is realized in such a way that the bonding pad of the solar cell comprises:
a pad body; and
and the welding marks are distributed in the pad main body in a set distribution mode.
Furthermore, a first set number of the welding marks form welding mark units in a first arrangement mode, and a plurality of the welding mark units are distributed in the pad main body in a set distribution mode.
Furthermore, a second set number of the welding mark units form a first mark group according to a first arrangement mode, a second set number of the welding mark units form a second mark group according to a second arrangement mode, the first arrangement mode is different from the second arrangement mode, and the first mark group and the second mark group are spaced in a second direction.
Furthermore, the first arrangement mode is arranged at equal intervals in the first direction, and the second arrangement mode is arranged continuously in the first direction.
Further, the pad body is rectangular, and the welding mark is hollow and circular.
Still further, the weld marks within the first mark group are staggered from the weld marks within the second mark group in a second direction.
Further, the distance between the first mark group and the second mark group is greater than or equal to 0.2 mm.
Further, the diameter of the welding mark is 0.1mm-0.3 mm.
Furthermore, the distance between the welding marks close to the two side edges of the pad main body and the two side edges of the pad main body is more than or equal to 0.1 mm.
The present invention also discloses a solar cell, which includes:
a back electrode; and
the bonding pads of the solar cell are arranged on the back electrode at intervals.
The embodiment of the utility model has the advantages that the welding marks distributed in a set distribution mode are arranged in the pad main body, so that a more accurate welding point is arranged between the welding pad and the welding strip, the printing area of the back electrode is reduced, the tolerance of the solar cell to the deviation of the welding strip is increased, when a plurality of solar cells are welded together, different solar cells can be accurately and stably welded and connected in series according to a plurality of welding marks in the welding pads of different solar cells without increasing the number and the size of the welding pads in the prior art, so that the area of the back passivation film corroded by back silver is not increased, under the prerequisite of having guaranteed solar cell's conversion efficiency, not increasing the wet weight of back of the body silver and not increasing back of the body silver printing area, increased the welding window of back electrode, promoted the welding performance of back electrode, guaranteed solar cell's manufacturing cost and generating efficiency.
Drawings
Fig. 1 is a schematic structural diagram of a bonding pad of a solar cell according to an embodiment of the utility model;
FIG. 2 is a schematic view of another structure of a bonding pad of a solar cell according to an embodiment of the utility model;
fig. 3 is a schematic view of another structure of a bonding pad of a solar cell according to an embodiment of the utility model.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the utility model and are not intended to limit the utility model.
In the prior art, a welding strip is welded on a welding pad of a solar cell, each solar cell is welded and connected in series through the welding strip to form a solar cell module, and the welding pad can improve the welding tension between the solar cell and the welding strip, so that the reliability of the solar cell module is improved. Generally, the welding performance of the back electrode can be improved by increasing the number and size of the pads on the back electrode, and the increase in the number and size of the pads can reduce the area of the back electrode itself, and increase the area of the back passivation film corroded by the back silver on the back electrode, which not only increases the cost of the solar cell, but also reduces the power generation efficiency of the solar cell.
According to the utility model, by optimizing the design of the back electrode, on the premise of ensuring the conversion efficiency, not increasing the wet weight of the back silver and not increasing the printing area of the back silver, the welding window is increased, and the welding performance of the back electrode is improved.
Referring to fig. 1, a pad 10 of a solar cell according to an embodiment of the present invention includes a pad body 11 and a plurality of bonding marks 12, wherein the plurality of bonding marks 12 are distributed in the pad body 11 according to a predetermined distribution.
In the pad 10 of the solar cell according to the embodiment of the present invention, the welding marks 12 distributed in a set distribution manner are disposed in the pad main body 11, so that the printing area of the back electrode is reduced, a more accurate solderable point is provided between the pad 10 and the solder strip, and the tolerance of the solar cell to the solder strip offset is increased. When welding a plurality of solar cells together, can be according to a plurality of welding marks 12 in the pad 10 of solar cell of difference, come the accuracy, firmly weld different solar cell, establish ties together, need not the mode through the number of current increase pad 10 and size, therefore can not lead to the back passivation membrane area increase of back silver corruption, conversion efficiency having guaranteed solar cell, under the prerequisite that does not increase back silver wet weight and do not increase back silver printing area, the welding window of back electrode has been increased, the welding performance of back electrode has been promoted, solar cell's manufacturing cost and generating efficiency have been guaranteed.
Specifically, the solar cell may be a PERC cell, an SE cell or an SE-PERC cell. In the embodiment of the present invention, the solar cell is a PERC cell, which has the basic structure of the PERC cell, such as a front electrode, an anti-reflective film, n-type silicon, a p-n junction, p-type silicon, a passivation film layer, a back electric field, a back electrode, and the like, and the solar cell can also realize the basic function of the PERC cell, and the detailed description of the specific structure and the specific function of the solar cell is not provided herein.
In the embodiment of the utility model, a plurality of bonding pads 10 are arranged on the back electrode of the solar cell at intervals, in the structure of the bonding pads 10, the bonding pad main body 11 is a part fixedly arranged with the back electrode, the bonding pad main body 11 can enable the bonding pads 10 to be stably arranged on the back electrode, and the bonding pad main body 11 can form certain difference with the self structure of the back electrode, so that the bonding pads 10 can be conveniently identified.
The pads 10 are arranged at intervals, so that the area of the back electrode covered by the pads 10 is reduced and the power generation efficiency of the solar cell is ensured on the premise that the back electrode is stably and effectively welded with a welding strip through the pads 10.
It should be noted that the distribution mode may be a distribution mode with a certain rule or a distribution mode without a rule. In the embodiment of the present invention, the distribution mode is set to be a distribution mode with a certain rule, so that the welding marks 12 form a structure with a certain rule and characteristic in the pad main body 11, and the pad 10 also forms a structure with a certain rule and characteristic, which is convenient for the production, manufacturing and identification of the pad 10. Meanwhile, when the solder strip is aligned with the solder mark 12 and soldered on the solder pad 10, the tension between the solder strip and the solder pad 10 is more uniform, and the stable connection between the solder strip and the solder pad is ensured.
In other embodiments, the set distribution mode may also be a distribution mode without rules, and the set distribution mode is not specifically limited, and may be specifically set according to actual requirements
Further, referring to fig. 1 and fig. 2, a first set number of the bonding marks 12 form a bonding mark unit 13 in a first arrangement, and a plurality of the bonding mark units 13 are distributed in the pad body 11 in a set distribution manner.
Specifically, the welding mark units 13 formed by the first set number of welding marks 12 in the first arrangement mode have a certain arrangement rule and characteristics, and compared with the arrangement of the plurality of welding marks 12 in the pad main body 11, the arrangement of the welding mark units 13 formed by the plurality of welding marks 12 in the pad main body 11 is easier to set, and the plurality of welding mark units 13 are distributed in the pad main body 11 in the set distribution mode, so that the pad 10 structure with the more obvious arrangement rule and characteristics is easier to form, the identification degree of the pad 10 on the back electrode is improved, and meanwhile, the welding strip is easier to weld according to the rule.
The first set number and the first arrangement may be selected according to the specific requirements of the pad 10 structure. Illustratively, in the embodiment of the present invention, the first set number is 4, the first arrangement manner is that the pads 10 shown in fig. 1 are arranged at equal intervals in the transverse direction (i.e., the x-axis direction), the arrangement manner is that the bonding marks 12 are distributed in "rows" in the pad main body 11, that is, the 4 bonding marks 12 are arranged at equal intervals in the transverse direction to form 1 bonding mark unit 13, and the plurality of bonding mark units 13 are distributed in "rows" in the pad main body 11 to form the pads 10.
The number of the 4 welding marks 12 is moderate, and the welding mark units 13 formed by arranging at equal intervals have simpler structure and obvious rules and characteristics. Meanwhile, the bonding pads 10 are distributed in the bonding pad main body 11 according to the 'rows' distribution, so that the bonding pad 10 is simple and convenient to form, and the obtained structure of the bonding pad 10 has obvious rules and characteristics.
In other embodiments, the first set number may also be another number (e.g., a number less than 4 or greater than 4), the first arrangement manner may be another arrangement manner (e.g., a continuous arrangement, etc.), and the set distribution manner (e.g., a distribution in "columns") may also be another distribution manner, where the first set number, the first arrangement manner, and the set distribution manner are not specifically limited herein, and may be specifically selected in a specific embodiment.
Further, referring to fig. 1 to 3, a second set number of welding mark units 13 form a first mark group 14 in a first arrangement manner, and a second set number of welding mark units 13 form a second mark group 15 in a second arrangement manner, the first arrangement manner and the second arrangement manner being different, and the first mark group 14 and the second mark group 15 are spaced in a second direction.
Specifically, in the embodiment of the present invention, in order to make the pad 10 have more obvious structural features, after the first set number of the welding marks 12 are arranged in the first arrangement manner to form the welding mark units 13, the second set number of the welding mark units 13 are arranged in the first arrangement manner to form the first mark group 14, and at the same time, the second set number of the welding mark units 13 are arranged in the second arrangement manner to form the second mark group 15, that is, the internal structure of the pad 10 is formed by the first mark group 14 and the second mark group 15, and the first arrangement manner is different from the second arrangement manner, that is, the structure of the first mark group 14 is different from that of the second mark group 15, and the first mark group 14 and the second mark group 15 cover the first direction and the second direction (the transverse direction and the longitudinal direction) of the pad body 11.
So, the inner structure of pad main part 11 possesses more obvious characteristic and law, can effectively promote the degree of discernment of pad 10 to when welding pad 10 and solder strip, can weld according to the structural distribution of first mark group 14 and second mark group 15 regularly, simple effective, labour saving and time saving. Meanwhile, the first mark group 14 and the second mark group 15 cover the distribution of the bonding pads 10 in the transverse direction and the longitudinal direction, so that the bonding between the bonding pads 10 and the bonding strip is more stable.
Illustratively, in the embodiment of the present invention, the second set number is 2, the second direction is the longitudinal direction, i.e., the illustrated y-axis direction, i.e., the 2 welding mark units 13 form the first mark group 14 in the first arrangement, the 2 welding mark units 13 form the second mark group 15 in the second arrangement, the first mark group 14 and the second mark group 15 are spaced in the longitudinal axis direction, and the first set number is 4, so that the first mark group 14 and the second mark group 15 include 8 welding marks 12.
The 2 welding mark units 13(8 welding marks 12) can be uniformly and regularly distributed in the pad main body 11, and cover the directions of the transverse axis and the longitudinal axis of the pad main body 11, so that the welding between the solder strip and the pad 10 is tight and stable, the pulling force between the solder strip and the pad 10 can not be reduced due to less welding points, and excessive welding process cost can not be caused due to too many welding points.
Of course, in other embodiments, the number of the welding mark units 13 may be other, and is not limited to the above-mentioned 2, and may be specifically selected in a specific embodiment.
In fig. 1 to 3, the number of the first mark groups 14 and the second mark groups 15 is 6, that is, 12 mark groups are distributed in the pad body 11, a combination of one first mark group 14 and one second mark group 15 forms a structure with regularity and characteristics, and the first mark groups 14 and the second mark groups 15 of each group are arranged at intervals in a crossing manner, so that the pad 10 has a compact structure to be more firmly and tightly welded with a solder strip. In other embodiments, the number of the first marker set 14 and the second marker set 15 may be other, and is not limited herein.
With reference to fig. 1 to fig. 3, in an embodiment of the present invention, the first arrangement is arranged at equal intervals in the first direction, and the second arrangement is arranged continuously in the first direction.
Specifically, the first direction is a transverse direction, that is, the x-axis direction, the first mark group 14 is formed by the welding mark units 13 of the second set number in a first arrangement manner, that is, the first mark group 14 is formed by arranging the 2 welding mark units 13 at equal intervals in the x-axis direction, and the second mark group 15 is formed by arranging the welding mark units 13 of the second set number in a second arrangement manner, that is, the second mark group 15 is formed by continuously arranging the 2 welding mark units 13 in the x-axis direction, so that the first mark group 14 and the second mark group 15 effectively cover the x-axis direction of the pad 10, and the welding of the solder strip in the x-axis direction is ensured.
In addition, the first mark group 14 and the second mark group 15 are arranged at intervals in the y-axis direction, the arrangement between the first mark group 14 and the second mark group 15 is not affected due to the too close distance between the two, and welding of the solder strips is easier to realize. The above description of the first arrangement and the second arrangement is only exemplary and should not be construed as limiting the present invention, and in other embodiments, the first arrangement and the second arrangement may be other.
It should be noted that the distance between each welding mark 12 can be set according to the size of the bonding pad 10 and the specific welding requirement, i.e. the distance between the welding marks 12 arranged at equal intervals is set according to the size of the bonding pad 10 and the specific welding requirement.
Further, as shown in fig. 1, the pad body 11 is rectangular, and the bonding mark 12 is hollow and circular.
Specifically, the rectangular shape of the pad body 11 is more regular and flat, and can be either adapted to the back electrode more regularly and beautifully or welded to the solder strip more conveniently. The welding mark 12 is in a hollow circular shape, so that the welding mark can be clearly distinguished from the pad main body 11, and the pulling force generated between the welding mark and the welding strip after the hollow circular welding is more uniform. Moreover, the densely arranged hollow circles are arranged in the rectangular pad main body 11, so that the welding stability is met, meanwhile, the printing area of the back electrode is reduced, and the production cost of the back electrode and the solar cell is controlled.
Of course, in other embodiments, the pad body 11 may also be circular, square, diamond, oval, etc., and the welding mark 12 may be in a different pattern from the pad body 11 to clearly distinguish the welding mark from the pad body 11, so as to avoid confusion.
Further, referring to fig. 1 to fig. 3, the welding marks 12 in the first mark group 14 and the welding marks 12 in the second mark group 15 are staggered in the second direction.
Specifically, the second direction is a longitudinal direction of the bonding pad 10 shown in fig. 1, i.e., a y-axis direction, and the bonding marks 12 in the first mark group 14 and the bonding marks 12 in the second mark group 15 are staggered, i.e., each bonding mark 12 in the first mark group 14 and each bonding mark 12 in the second mark group 15 are not aligned on the same line in the y-axis direction, but the bonding pad 10 has a uniform and axisymmetric structure. Therefore, when the solder strip is welded to the bonding pad 10, the distribution of the tension between the solder strip and the bonding pad 10 can be more uniform, and the reliability of the solar cell and the solar cell module can be improved.
Further, in the embodiment of the present invention, the distance between the first mark group 14 and the second mark group 15 is greater than or equal to 0.2 mm.
As shown in fig. 1 to 3, in the y-axis direction, when the distance between the first mark group 14 and the second mark group 15 is greater than or equal to 0.2mm, and the distance between the first mark group 14 and the second mark group 15 is within the above distance range, it can be avoided that the distance between the first mark group 14 and the second mark group 15 is too close, which causes the tensile force after the bonding of the bonding pad 10 and the bonding tape to be too concentrated and affects the stability between the bonding pad 10 and the bonding tape.
Further, in the present embodiment, the diameter of the welding mark 12 is 0.1mm to 0.3 mm.
Specifically, when the diameter of the welding mark 12 is within the above range, the size of the formed welding mark 12 is moderate, the setting of the welding mark 12 is easy, the welding effect is not easily affected by the undersize of the welding mark 12, and the number and the position distribution of the welding mark 12 are not easily affected by the oversized of the welding mark 12.
Of course, in other embodiments, the diameter range of the welding marks 12 may be other, and is not limited to the above-mentioned diameter range, and may be specifically set in a specific embodiment.
Furthermore, in the embodiment of the present invention, the bonding marks 12 near the two side edges of the pad body 11 are spaced from the two side edges of the pad body 11 by a distance of 0.1mm or more.
That is, the distance between the edge and the welding mark 12 (the welding mark 12 in the first mark group 14) located at the two side edges of the pad body 11 is at least 0.1mm, so that it can be avoided that the welding mark 12 is too close to the edge of the pad body 11, which results in an increase in welding difficulty, and the welding range is too large when welding the welding strip, which even exceeds the edge of the pad body 11, which results in an influence on the welding stability between the welding strip and the pad 10.
In the description herein, references to the description of the terms "example one," "example two," etc. mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present application. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The present invention is not limited to the above preferred embodiments, and any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. A pad for a solar cell, comprising:
a pad body; and
the welding marks are distributed in the pad main body in a set distribution mode;
the welding marks of a first set number form welding mark units in a first arrangement mode, and the welding mark units are distributed in the pad main body in a set distribution mode.
2. The bonding pad of a solar cell according to claim 1, wherein a second set number of the soldering mark units constitute a first mark group in a first arrangement, a second set number of the soldering mark units constitute a second mark group in a second arrangement, the first arrangement is different from the second arrangement, and the first mark group and the second mark group are spaced apart in a second direction.
3. The bonding pad for a solar cell according to claim 2, wherein the first arrangement is arranged at equal intervals in the first direction, and the second arrangement is arranged continuously in the first direction.
4. The bonding pad for a solar cell according to claim 1, wherein the bonding pad body has a rectangular shape, and the bonding mark has a hollow circular shape.
5. The bonding pad of the solar cell according to claim 2, wherein the soldering marks in the first mark group are staggered from the soldering marks in the second mark group in a second direction.
6. The pad of the solar cell of claim 2, wherein a distance between the first mark group and the second mark group is 0.2mm or more.
7. The bonding pad for a solar cell according to claim 4, wherein the soldering mark has a diameter of 0.1mm to 0.3 mm.
8. The bonding pad for a solar cell according to claim 1, wherein the bonding mark near both side edges of the bonding pad main body is spaced apart from both side edges of the bonding pad main body by a distance of 0.1mm or more.
9. A solar cell, comprising:
a back electrode; and
a pad for a solar cell according to any one of claims 1 to 8, a plurality of said pads being spaced apart on said back electrode.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202121039814.8U CN215771180U (en) | 2021-05-14 | 2021-05-14 | Pad of solar cell and solar cell |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202121039814.8U CN215771180U (en) | 2021-05-14 | 2021-05-14 | Pad of solar cell and solar cell |
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| CN215771180U true CN215771180U (en) | 2022-02-08 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115172485A (en) * | 2022-07-06 | 2022-10-11 | 浙江晶科能源有限公司 | Solar cell and photovoltaic module |
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2021
- 2021-05-14 CN CN202121039814.8U patent/CN215771180U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115172485A (en) * | 2022-07-06 | 2022-10-11 | 浙江晶科能源有限公司 | Solar cell and photovoltaic module |
| CN115172485B (en) * | 2022-07-06 | 2024-02-06 | 浙江晶科能源有限公司 | Solar cell and photovoltaic module |
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