CN218241859U - Solar cell and photovoltaic module - Google Patents
Solar cell and photovoltaic module Download PDFInfo
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- CN218241859U CN218241859U CN202222232751.9U CN202222232751U CN218241859U CN 218241859 U CN218241859 U CN 218241859U CN 202222232751 U CN202222232751 U CN 202222232751U CN 218241859 U CN218241859 U CN 218241859U
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Abstract
The application discloses a solar cell, which comprises a front electrode, wherein the front electrode comprises a plurality of main grid lines arranged in parallel and a plurality of thin grid lines electrically connected with the main grid lines in a vertical mode, each main grid line comprises a first main body part and fish fork structures arranged at two ends of the first main body part, each fish fork structure comprises two bifurcation lines and a plurality of pairs of antennae, each pair of antennae are respectively positioned on the two bifurcation lines, and at least one pair of antennae is positioned at one end, far away from the first main body part, of each bifurcation line; in each fish spear structure, the number of pairs of antennae is less than the number of thin grid lines electrically connected with the fish spear structure; the thin grid line electrically connected with the fish-spear structure comprises a second main body part, and the second main body part is positioned outside the fish-spear structure and is electrically connected with the antenna. The application also provides a photovoltaic module.
Description
Technical Field
The application relates to the technical field of solar cells, in particular to a solar cell and a photovoltaic module.
Background
With the development of new energy technology, the development of crystalline silicon solar cells for converting solar energy into electric energy is rapid. The preparation of the crystalline silicon solar cell comprises the working procedures of texturing, diffusion, SE, etching, annealing, film coating, screen printing and the like. The screen printing process is to manufacture the electrode of the solar cell, and the process sequence generally comprises the steps of firstly printing and drying the back silver electrode, secondly printing and drying the aluminum back field, secondly printing and drying the front silver electrode-main grid line, and finally printing and sintering the front silver electrode-fine grid line.
Because silver electrode can influence the surperficial shading area of battery piece to restricting solar cell's conversion efficiency to promote, because the improvement of thick liquids technique and printing technology at present, improve the performance of battery through constantly reducing the electrode thin bars width and reduce the shading area, but because the width that constantly reduces thin bars leads to disconnected bars proportion to increase, thereby influences solar cell's performance and structural stability.
SUMMERY OF THE UTILITY MODEL
In view of this, the present application provides a solar cell, in the thin grid line electrically connected to the harpoon structure, because the number of the reinforcing parts is smaller than the number of the second main body parts, and only a part of the second main body parts is electrically connected to the antenna, the light shielding area of the thin grid line on the surface of the cell can be reduced, and meanwhile, because the width of the two ends of the reinforcing parts is larger than the width of the second main body parts, the situation of grid breakage can be greatly reduced, and the performance of the cell and the stability of the structure can also be enhanced.
In order to achieve the above object, according to one aspect of the present application, there is provided a solar cell including a front electrode including a plurality of main gate lines arranged in parallel, and a plurality of thin gate lines electrically connected to the main gate lines in a perpendicular direction;
the main grid line comprises a first main body part and a fish fork structure arranged at two ends of the first main body part, the fish fork structure comprises two branch lines and a plurality of pairs of antennae, each pair of antennae is respectively positioned on the two branch lines, and at least one pair of antennae is positioned at one end, far away from the first main body part, of the two branch lines; in each harpoon structure, the number of pairs of the antennae is less than the number of thin grid lines electrically connected with the harpoon structure;
the position of an antenna is arranged on the bifurcation line, the thin grid line electrically connected with the fish-fork structure comprises a second main body part, and the second main body part is positioned outside the fish-fork structure and is electrically connected with the antenna;
at the position without an antenna on the bifurcation line, the thin grid line electrically connected with the harpoon structure comprises a reinforcing part and a second main body part, and the two ends of the reinforcing part are both connected with the second main body part; the second main body part is positioned outside the fish fork structure, and the reinforcing part crosses two bifurcation lines;
the width of both ends of the reinforcing part is greater than the width of the second main body part.
Further, the reinforcing part comprises a first end, a middle part and a second end which are electrically connected together in sequence, and the width of the middle part is larger than that of the second main body part.
Further, the reinforcing part comprises a first end, a middle part and a second end which are integrally formed, and the first end and the second end are the same in shape.
Further, the width of the first end or the second end gradually increases and then gradually decreases along the direction close to the middle part, the maximum width position of the first end or the second end is a maximum end, and the minimum width position thereof is a minimum end.
Further, the width of the very large end is 2-5 times of the width of the second main body part, and the width of the very small end is equal to the width of the second main body part.
Further, the width of the middle part is 1-4 times of the width of the second main body part.
Further, the extreme large end and the bifurcation line have an overlapping region.
Further, the width of the antenna is larger than the width of the second main body portion.
Further, the width of the antenna is 2-5 times of the width of the second main body part.
The application also provides a photovoltaic module comprising the solar cell.
According to the solar cell, the number of the reinforcing parts is smaller than that of the second main body parts, and only part of the second main body parts are electrically connected with the antennae, so that the antennae are fewer, the shading area of the thin grid lines on the surface of the cell can be reduced, and meanwhile, the width of the two ends of the reinforcing parts is larger than that of the second main body parts, so that the condition of grid breaking can be greatly reduced, and the performance and the structural stability of the cell can be further enhanced.
Drawings
The drawings are included to provide a further understanding of the application and are not to be construed as limiting the application. Wherein:
FIG. 1 is a prior art solar cell front electrode layout;
FIG. 2 is a master grid layout of a front electrode of a solar cell according to the present application;
fig. 3 is a fine grid layout of a solar cell front electrode according to the present application.
List of reference numerals
1-a first body portion, 2-a harpoon structure, 3-a bifurcation line, 4-an antenna, 5-a second body portion, 6-a reinforcement portion.
Detailed Description
The following description of the exemplary embodiments of the present application, taken in conjunction with the accompanying drawings, includes various details of the embodiments of the application to assist in understanding, which are to be considered exemplary only. Accordingly, those of ordinary skill in the art will recognize that various changes and modifications of the embodiments described herein can be made without departing from the scope and spirit of the present application. Also, descriptions of well-known functions and constructions are omitted in the following description for clarity and conciseness.
All electrical connections in this application are direct contact connections and do not include indirect connections.
The application provides a solar cell, including the front electrode, the front electrode is including a plurality of main grid lines of parallel arrangement, and with a plurality of thin grid lines of the perpendicular electricity of main grid line is connected.
As shown in fig. 2, the main grid line includes a first main body portion 1 and a fish-fork structure 2 disposed at two ends of the first main body portion 1, where the fish-fork structure 2 includes two branch lines 3 and a plurality of pairs of antennas 4, each pair of antennas 4 is respectively located on the two branch lines 3, and at least one pair of antennas 4 is located at one end of the two branch lines 3 away from the first main body portion 1 (that is, the positions of the antennas 4 on the branch lines 3 except that one pair of antennas 4 must be located at one end of the two branch lines 3 away from the first main body portion 1, the positions of the other pairs of antennas 4 may be located at any position on the branch lines 3, and in some examples, a plurality of pairs of antennas 4 are disposed at end positions of the branch lines 3); the logarithm of the antenna 4 is less than the number of the thin grid lines electrically connected with the harpoon structure 2 (namely, only part of the thin grid lines can be electrically connected with the antenna 4 when passing through the harpoon structure 2);
the thin grid line electrically connected with the antenna 4 comprises a second main body part 5, wherein the second main body part 5 is positioned outside the fish-fork structure 2 and is electrically connected with the antenna 4; i.e. each of the finger lines electrically connected to the antenna 4 is disconnected between two of the bifurcation lines 3.
At the position of the non-contact angle 4 on the bifurcation line 3, the thin grating line passing through the position comprises a reinforcing part 6 and a second main body part 5, and the two ends of the reinforcing part 6 are connected with the second main body part 5; the second body part 5 is located outside the harpoon structure 2 and the reinforcement part 6 crosses both of the bifurcations 3, i.e. the reinforcement part 6 intersects both of the bifurcations 3.
Specifically, the width of both ends of the reinforcing portion 6 is larger than the width of the second body portion 5. Because the amount of the silver paste in the area is large, the corrosion capability of tin to silver is limited under the same solder strip, the damage of tin to silver-silicon contact is reduced, and the risks of over-soldering and grid breaking are reduced.
In particular, the length of the reinforcement is slightly greater than the distance between two bifurcations.
Specifically, the fish spear structure 2 is arranged in an axisymmetric manner with the central axes of the two branch lines 3 as axes.
Specifically, the material of the main grid line and the material of the fine grid line are silver paste materials.
Specifically, a plurality of main grid lines are arranged in parallel at equal intervals, and a plurality of thin grid lines are arranged in parallel at equal intervals.
Specifically, the two branch lines 3 of the fish spear structure 2 may be arranged in parallel or may form a certain angle. That is, the two bifurcation lines 3 and the thin gate lines may be arranged perpendicularly to form a rectangular pattern, or the two bifurcation lines 3 and the thin gate lines form a certain angle to form a trapezoidal pattern.
In particular, the width of the antenna 4 is greater than the width of the second body portion 5.
The width of the antenna 4 is 2 to 5 times the width of the second body portion, and may be, for example, 2 times, 2.5 times, 3 times, 3.5 times, 4 times, 4.5 times, or 5 times. By adopting the design, the risks of over welding and grid breaking of the assembly end can be reduced.
The width of the first body portion 1 is 0.03 to 0.08mm, and may be, for example, 0.03mm, 0.04mm, 0.05mm, 0.06mm, 0.07mm, or 0.08mm.
The width of the second body portion 5 is 0.01-0.02mm, for example 0.01mm or 0.02mm.
In this application, owing to set up the position of feeler on the bifurcation line, the thin grid line of being connected with the harpoon structure electricity includes the second main part, and the second main part is located outside the harpoon structure, that is to say, sets up the position of feeler on the bifurcation line, and thin grid line is disconnected in harpoon structure position department, does not set up thin grid line between two bifurcation lines, and only part second main part 5 is connected with 4 electricity of feeler, and feeler 4 is less promptly to can reduce thin grid line to battery piece surface shading area, and reduce the consumption of thick liquids.
On the basis, at the position without an antenna on the bifurcation, the thin grid line electrically connected with the fish-spear structure comprises a reinforcing part and a second main body part, the reinforcing part transversely penetrates through the two bifurcation, and because the width of the two ends of the reinforcing part 6 is greater than that of the second main body part 5, the risks of overwelding and grid breakage can be reduced, and the performance and the structural stability of the battery can be further enhanced.
In one embodiment, as shown in fig. 2 and 3, each crotch line 3 of the harpoon structure 2 is connected to six parallel second body parts 5. The connection points of the bifurcation line 3 and the six second trunk portions 5 are respectively a first position, a second position, a third position, a fourth position, a fifth position, and a sixth position.
Specifically, the first, second, third, fourth, fifth, and sixth bits equally divide the bifurcation line 3 into 5 sections. On every bifurcation line 3, antenna 4 is located bifurcation line 3's first position, second position and sixth position respectively, just first position and sixth position are bifurcation line 3's both ends respectively, the distance between first position to the second position is bifurcation line 3 one fifth of length.
The two branch lines 3 have three parallel reinforcing portions 6 arranged at equal intervals. The three reinforcing portions 6 are connected to the third position, the fourth position, and the fifth position of the branch line 3, respectively. The distance between two adjacent reinforcement parts 6 is one fifth of the length of the crotch line 3.
In the present application, the reinforcement portion 6 includes a first end, a middle portion, and a second end that are integrally formed.
Specifically, the first end, the second end and the middle portion are all at least one of rectangular, triangular, fusiform, diamond-shaped and arc-shaped, including but not limited to.
Specifically, the first end and the second end are the same shape.
Specifically, the width of the first end or the second end gradually increases and then gradually decreases along a direction close to the middle portion, the maximum width of the first end or the second end is a maximum end, and the minimum width of the first end or the second end is a minimum end. By adopting the design, the condition of grid breakage can be greatly reduced, the battery performance and the structural stability are enhanced, and the printing continuity and the saturation are conveniently improved.
Specifically, the width of the extreme large end is 2 to 5 times the width of the second body portion, and may be, for example, 2 times, 2.5 times, 3 times, 3.5 times, 4 times, 4.5 times, or 5 times. The width of the minimum end is equal to the width of the second main body part.
Specifically, the width of the middle portion is greater than the width of the second body portion.
Specifically, the width of the middle portion is 1 to 4 times the width of the second body portion, and may be, for example, 1, 2, 2.5, 3, 3.5, or 4 times.
In particular, the extreme end has an overlapping region with the bifurcation line.
The application also provides a photovoltaic module, which comprises the solar cell, and the specific content can refer to the description of the solar cell.
Examples
The following examples are carried out in the conventional manner, unless otherwise specified.
Materials, reagents and the like used in the following examples are commercially available unless otherwise specified.
Example 1
In the solar cell in this embodiment, the front electrode includes a plurality of main grid lines arranged in parallel and a plurality of thin grid lines perpendicular to the main grid lines, the main grid lines include a first main body portion 1 and a fish-spear structure 2 arranged at two ends of the first main body portion 1, and the fish-spear structure 2 includes two parallel branch lines 3 and three pairs of antennas 4. Each fine grid line electrically connected with the harpoon structure 2 comprises a second main body part 5 or comprises a second main body part and a reinforcing part 6, and six pairs of parallel equidistant second main body parts 5 are electrically connected with the harpoon structure 2. On the bifurcation line 3, the connection sites with the six pairs of the second trunk portions 5 are the first, second, third, fourth, fifth, and sixth sites, respectively. An antenna 4 is arranged at the first position, the second position and the sixth position on each branch line 3, the second main body part 5 is connected with the antenna 4, and a reinforcing part 6 is not arranged between the two branch lines 3, namely the thin grid line is disconnected between the two branch lines 3. In the third, fourth and fifth positions of the bifurcation 3, a reinforcing part 6 is provided between the two bifurcation 3, that is, the length of the reinforcing part 6 is slightly longer than the distance between the two bifurcation 3, and each pair of the second body parts 5 is electrically connected to the reinforcing part 6 after passing through the third, fourth and fifth positions of the bifurcation 3.
The fish spear structure 2 takes the central axes of the two bifurcate lines 3 as axes and is arranged in an axisymmetric manner.
The reinforcing part 6 comprises a first end, a middle part and a second end, the shape and the size of the first end are the same as those of the second end, the width of the first end and the width of the second end are gradually increased and then gradually decreased along the direction close to the middle part, the maximum width of the first end is a maximum end, and the minimum width of the first end is a minimum end. The width of the maximum end is 3 times of the width of the second main body part, the width of the minimum end is equal to the width of the second main body part, and the width of the middle part is 2 times of the width of the second main body part.
The width of the second main body part is 0.02mm. The width of the first main body part 1 is 0.5mm, and the width of the antenna 4 is 0.04mm. The length is 0.6mm.
The parameters of the solar cell of this example are shown in table 1.
Examples 2 to 4 were different from example 1 in that the width of the maximum end was different from the multiple of the width of the second body portion, and the parameters of the solar cell of this example are shown in table 1.
Examples 5 to 6 are different from example 1 in that the width of the central portion is different from the multiple of the width of the second body portion, and the parameters of the solar cell of this example are shown in table 1.
The solar cell of comparative example 1 is shown in fig. 1, and is different from example 1 in that the fish-fork structure 2 in the front electrode structure, specifically, the first, second, third, fourth, fifth, and sixth positions on the bifurcation 3 are provided with the antenna 4, and the thin grid line between the two bifurcation 3 is not broken and has no reinforcing part 6.
The parameters of the solar cell of this example are shown in table 1.
The solar cell of comparative example 2 and example 1 is different from that of example 1 in that the front electrode of comparative example 2 has no reinforcement.
The parameters of the solar cell of this example are shown in table 1.
Table 1 shows the parameters of the examples and comparative examples of the present application
And (4) summarizing: as can be seen from table 1, the solar cells prepared in examples 1 to 6 of the present application have a lower rate of repairing the broken gate and a higher cell efficiency than those of comparative example 1 and comparative example 2.
Although the embodiments of the present application have been described above with reference to the accompanying drawings, the present application is not limited to the above-described embodiments and fields of application, and the above-described embodiments are merely illustrative, instructive, and not restrictive. Those skilled in the art, having the benefit of this disclosure, may effect numerous modifications thereto and changes may be made without departing from the scope of the invention as defined by the appended claims.
Claims (10)
1. The solar cell is characterized by comprising a front electrode, wherein the front electrode comprises a plurality of main grid lines arranged in parallel and a plurality of thin grid lines vertically and electrically connected with the main grid lines;
the main grid line comprises a first main body part and a fish fork structure arranged at two ends of the first main body part, the fish fork structure comprises two branch lines and a plurality of pairs of antennae, each pair of antennae is respectively positioned on the two branch lines, and at least one pair of antennae is positioned at one end, far away from the first main body part, of the two branch lines; in each harpoon structure, the number of pairs of the antennae is less than the number of thin grid lines electrically connected with the harpoon structure;
the position of an antenna is arranged on the bifurcation line, the thin grid line electrically connected with the fish-fork structure comprises a second main body part, and the second main body part is positioned outside the fish-fork structure and is electrically connected with the antenna;
at the position without an antenna on the bifurcation line, the thin grid line electrically connected with the harpoon structure comprises a reinforcing part and a second main body part, and the two ends of the reinforcing part are both connected with the second main body part; the second main body part is positioned outside the fish fork structure, and the reinforcing part crosses two bifurcation lines;
the width of both ends of the reinforcing part is greater than the width of the second main body part.
2. The solar cell of claim 1, wherein the reinforcement portion comprises a first end, a middle portion and a second end electrically connected together in sequence, the middle portion having a width greater than a width of the second body portion.
3. The solar cell of claim 1 or 2, wherein the reinforcement portion comprises a first end, a middle portion, and a second end that are integrally formed, the first end having the same shape as the second end.
4. The solar cell according to claim 3, wherein the width of the first end or the second end gradually increases and then gradually decreases in a direction approaching the middle portion, the maximum width of the first end or the second end is the maximum end, and the minimum width thereof is the minimum end.
5. The solar cell of claim 4, wherein the width of the very large end is 2-5 times the width of the second body portion, and the width of the very small end is equal to the width of the second body portion.
6. The solar cell of claim 3, wherein the width of the central portion is 1-4 times the width of the second body portion.
7. The solar cell of claim 4, wherein the extreme end has an overlapping region with the bifurcation line.
8. The solar cell of claim 1, wherein the width of the antenna is greater than the width of the second body portion.
9. The solar cell of claim 1, wherein the width of the antenna is 2-5 times the width of the second body portion.
10. A photovoltaic module comprising the solar cell of any one of claims 1-9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222232751.9U CN218241859U (en) | 2022-08-24 | 2022-08-24 | Solar cell and photovoltaic module |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222232751.9U CN218241859U (en) | 2022-08-24 | 2022-08-24 | Solar cell and photovoltaic module |
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| Publication Number | Publication Date |
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| CN218241859U true CN218241859U (en) | 2023-01-06 |
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| CN202222232751.9U Active CN218241859U (en) | 2022-08-24 | 2022-08-24 | Solar cell and photovoltaic module |
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