CN219017666U - Back contact battery piece and photovoltaic module - Google Patents
Back contact battery piece and photovoltaic module Download PDFInfo
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- CN219017666U CN219017666U CN202222892895.7U CN202222892895U CN219017666U CN 219017666 U CN219017666 U CN 219017666U CN 202222892895 U CN202222892895 U CN 202222892895U CN 219017666 U CN219017666 U CN 219017666U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
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Abstract
The present disclosure relates to a back contact battery piece and photovoltaic module, the back contact battery piece includes: a battery piece body; the main grid line is arranged on the backlight side of the battery piece body and comprises at least one positive electrode main grid line and at least one negative electrode main grid line; the positive electrode main grid line and the negative electrode main grid line are both constructed into non-closed fold lines and are arranged at intervals. Therefore, the stress generated in the multi-direction of the battery piece in the process of printing the grid line is mutually contained, the problem of warping of the battery piece caused by unidirectional stress of the battery piece in the related art is solved, and the fragmentation rate of the battery piece is reduced.
Description
Technical Field
The disclosure relates to the technical field of photovoltaic power generation, in particular to a back contact battery piece and a photovoltaic module.
Background
The emitter, the surface field and the metal electrode of the back contact battery are all arranged on the back of the battery, the front surface of the battery is free from shielding by any grid line, and the light absorption area is large, so that the energy conversion efficiency of the battery piece is improved.
In the related art, the battery piece of the back contact battery is usually designed by adopting a linear grid line, and the grid lines are all positioned on the backlight side of the battery piece.
Disclosure of Invention
The disclosure aims to provide a back contact battery piece and a photovoltaic module, wherein the back contact battery piece is formed into a non-closed fold line through a positive electrode main grid line and a negative electrode main grid line, so that the battery piece is prevented from tilting when the grid line is printed, and the problems in the related art are at least partially solved.
To achieve the above object, in a first aspect, the present disclosure provides a back contact battery sheet, including: a battery piece body; the main grid line is arranged on the backlight side of the battery piece body and comprises at least one positive electrode main grid line and at least one negative electrode main grid line; the positive electrode main grid line and the negative electrode main grid line are both constructed into non-closed fold lines and are arranged at intervals.
Optionally, the positive electrode main grid line and the negative electrode main grid line are both zigzag folding lines and are mutually nested.
Optionally, the positive electrode main grid line and the negative electrode main grid line are both toothed folding lines or step folding lines.
Optionally, a spacing between the positive electrode main gate line and the negative electrode main gate line is not less than 5mm.
Optionally, at least one first connection section is formed at the outer end of the positive electrode main grid line; and at least one second connecting section is formed at the outer end of the negative main grid line.
Optionally, the back contact battery piece further includes an auxiliary grid line, the auxiliary grid line includes a plurality of positive electrode auxiliary grid lines and a plurality of negative electrode auxiliary grid lines, the positive electrode auxiliary grid lines are respectively electrically connected to the positive electrode main grid line, and the negative electrode auxiliary grid lines are respectively electrically connected to the negative electrode main grid line.
Alternatively, the positive sub-gate line and the negative sub-gate line are configured in a shuttle shape or a zigzag shape.
Optionally, the back contact battery piece further includes a plurality of bonding pads, at least part of which are arranged at intervals between the positive electrode main grid line and the negative electrode main grid line; at least part of the bonding pads are arranged on the first connecting section and the second connecting section.
Optionally, the back contact battery piece further comprises insulating glue, and the insulating glue is respectively arranged at two ends of each positive electrode auxiliary grid line and two ends of each negative electrode auxiliary grid line.
In a second aspect, the disclosure provides a photovoltaic module, including the back contact battery sheet described above, and a plurality of the back contact battery sheets are connected in series.
Through the technical scheme, at least one positive electrode main grid line and at least one negative electrode main grid line are arranged on the backlight side of the back contact battery piece, and the positive electrode main grid line and the negative electrode main grid line are both constructed into non-closed fold lines and are arranged at intervals. Therefore, when the grid lines are printed on the battery piece, the stress borne by the positive electrode main grid line and the negative electrode main grid line on the battery piece can be dispersed in a plurality of directions along the non-closed fold line, the stress generated in the plurality of directions is mutually contained, the stress of the battery piece body is relatively more uniform, the problem of battery piece warping caused by unidirectional stress of the grid lines when the grid lines are printed on the battery piece in the related art is at least partially solved, and the fragment rate of the battery piece is reduced.
Additional features and advantages of the present disclosure will be set forth in the detailed description which follows.
Drawings
The accompanying drawings are included to provide a further understanding of the disclosure, and are incorporated in and constitute a part of this specification, illustrate the disclosure and together with the description serve to explain, but do not limit the disclosure. In the drawings:
fig. 1 is a schematic structural view of a back contact battery sheet provided in an exemplary embodiment of the present disclosure;
FIG. 2 is an enlarged view of portion A of FIG. 1;
fig. 3 is a schematic bottom view of a battery provided in an exemplary embodiment of the present disclosure;
fig. 4 is a schematic diagram of a front view of a battery provided in an exemplary embodiment of the present disclosure;
fig. 5 is a schematic bottom view of another battery provided in an exemplary embodiment of the present disclosure.
Description of the reference numerals
1-a battery piece body; 2-main grid lines; 21-positive main grid line; 211-a first gate line; 212-a second gate line; 213-a first connection section; 22-negative electrode main grid line; 221-a third gate line; 222-fourth gate line; 223-a second connection section; 3-auxiliary grid lines; 31-an anode auxiliary grid line; 32-negative electrode auxiliary grid lines; 4-bonding pads; 5-insulating glue; and 6, welding the tape.
Detailed Description
Specific embodiments of the present disclosure are described in detail below with reference to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating and illustrating the disclosure, are not intended to limit the disclosure.
In the present disclosure, unless otherwise indicated, the terms "first," "second," and the like are used in the present disclosure to distinguish one element from another without sequence or importance. When the following description refers to the accompanying drawings, the same numbers in different drawings refer to the same or similar elements, unless otherwise indicated. It should be noted that, the fold line mentioned in this disclosure refers to a zigzag line formed by sequentially connecting a plurality of line segments end to end, and when the start point and the end point overlap, the fold line is closed.
As shown in fig. 1-5, in a first aspect, the present disclosure provides a back contact battery sheet comprising: a battery piece body 1; the main grid line 2 is arranged on the backlight side of the battery piece body 1 and comprises at least one positive electrode main grid line 21 and at least one negative electrode main grid line 22; wherein, the positive electrode main grid line 21 and the negative electrode main grid line 22 are configured as non-closed fold lines and are arranged at intervals.
Through the above technical scheme, at least one positive electrode main grid line 21 and at least one negative electrode main grid line 22 are arranged on the backlight side of the back contact battery piece, and the positive electrode main grid line 21 and the negative electrode main grid line 22 are both constructed as non-closed fold lines and are arranged at intervals. Thus, when the grid lines are printed on the battery piece, the stress on the positive electrode main grid line 21 and the negative electrode main grid line 22 on the battery piece can be dispersed in a plurality of directions along the non-closed fold line, the stress generated in the plurality of directions is mutually contained, the stress of the battery piece body 1 is relatively more uniform, the problem of battery piece warping caused by unidirectional stress of the grid lines when the grid lines are printed on the battery piece in the related art is at least partially solved, and the fragment rate of the battery piece is reduced.
In some embodiments, the positive electrode main gate line 21 may include at least a first gate line 211 and a second gate line 212 disposed to cross each other; the negative main gate line 22 may include at least a third gate line 221 and a fourth gate line 222 disposed to cross, and the plurality of first gate lines 211 and the plurality of second gate lines 212 are sequentially connected and disposed to be perpendicular to each other; the third gate lines 221 and the fourth gate lines 222 are sequentially connected and vertically arranged, and an extending direction of the first gate line 211 is parallel to an extending direction of the third gate line 221. For example, referring to fig. 1, the first and third gate lines 211 and 221 each extend in the vertical direction in fig. 1, the second and fourth gate lines 212 and 222 each extend in the horizontal direction in fig. 1, the first and second gate lines 211 and 212 are connected end to end, and the third and fourth gate lines 221 and 222 are connected end to end. In this way, when the battery plate is printed with the grid lines, the first grid line 211 and the third grid line 221 of the battery plate mainly generate horizontal stress, the second grid line 212 and the fourth grid line 222 mainly generate vertical stress, and the battery plate is provided with a plurality of first grid lines 211, second grid lines 212, third grid lines 221 and fourth grid lines 222, so that the horizontal stress and the vertical stress on the battery plate are mutually contained, the single-direction stress of the battery plate is avoided, the warping is generated, and the fragment rate of the battery plate is reduced.
Alternatively, the positive electrode main grid line 21 and the negative electrode main grid line 22 are both zigzag lines and are nested with each other. For example, the positive electrode main gate line 21 may include at least a first gate line 211 and a second gate line 212 disposed to intersect; the cathode main grid line 22 may at least include a third grid line 221 and a fourth grid line 222 which are arranged in a crossing manner, wherein the first grid line 211 and the second grid line 212 in the anode main grid line 21 are sequentially connected from the outside to the inside around the outline of the battery piece, the lengths of the first grid line 211 and the second grid line 212 are gradually shortened from the outside to the inside, and corresponding anode auxiliary grid lines 31 are arranged on the first grid line 211 and the second grid line 212 at intervals; the third grid line 221 and the fourth grid line 222 in the cathode main grid line 22 are also connected end to end around the outline of the battery piece in turn from outside to inside, the lengths of the third grid line 221 and the fourth grid line 222 are gradually shortened from outside to inside, and the corresponding cathode auxiliary grid lines 32 are arranged on the third grid line 221 and the fourth grid line 222 at intervals. Therefore, the positive electrode main grid line 21 and the negative electrode main grid line 22 form a back-shaped fold line, which is convenient for processing the positive electrode main grid line 21 and the negative electrode main grid line 22, and enables the positive electrode main grid line 21 and the negative electrode main grid line 22 to generate stress in the vertical direction and the horizontal direction in sequence during printing, so that the stress on the battery piece is mutually contained, and the warping of the battery piece caused by the stress in a single direction is avoided.
It will be appreciated that the foregoing positive main grid line 21 and the negative main grid line 22 are both schematic, and in other embodiments, other structures may be also used, for example, the positive main grid line 21 and the negative main grid line 22 may be both zigzag lines or step-shaped zigzag lines, as shown in fig. 5, and the positive main grid line 21 and the negative main grid line 22 may also be both zigzag lines, and they are disposed at intervals along a first direction, where the first direction refers to the vertical direction in fig. 5, so that not only the positive main grid line 21 and the negative main grid line 22 are convenient to process, but also stresses in different directions can be generated during printing of the positive main grid line 21 and the negative main grid line 22, so as to avoid the warpage of the battery sheet caused by unidirectional stress of the battery sheet.
In addition, for example, the positive electrode main grid line 21 and the negative electrode main grid line 22 are formed as a step-shaped fold line, wherein the positive electrode main grid line 21 includes a plurality of first grid lines 211 and a plurality of second grid lines 212, wherein the plurality of second grid lines extend along a first direction and are arranged at intervals along a second direction perpendicular to the first direction, the plurality of first grid lines 211 extend along the second direction and are arranged in parallel along the first direction, the plurality of first grid lines 211 and the plurality of second grid lines 212 are alternately arranged and are sequentially connected, if the first grid line 211 is started, the tail end of the first grid line 211 is connected with the head end of the adjacent second grid line 212, the tail end of the second grid line 212 is connected with the head end of another first grid line 211 arranged at intervals, and the steps are formed along the first direction in a circulating manner, so that the positive electrode main grid line 21 generates stress in different directions, and similarly, the negative electrode main grid line 22 can also generate stress in different directions, so that when the positive electrode main grid line 21 and the negative electrode main grid line 22 are constructed as a single-shaped fold line, the single-shaped fold line is prevented from being printed by the step-shaped fold line.
In some embodiments, the spacing between the positive electrode main gate line 21 and the negative electrode main gate line 22 is not less than 5mm. In this way, the positive electrode main grid line 21 and the negative electrode main grid line 22 can cover more areas, current collection efficiency is improved, and insulation between the positive electrode main grid line 21 and the negative electrode main grid line 22 can be achieved through the fact that the distance between the positive electrode main grid line 21 and the negative electrode main grid line 22 is not smaller than 5mm.
In some embodiments, the outer end of the positive electrode main gate line 21 is formed with at least one first connection section 213; the outer end of the negative main gate line 22 is formed with at least one second connection section 223. For example, the first connection section 213 is formed to extend outward at the outer end of the positive electrode main grid line 21, and the second connection section 223 is formed to extend outward at the outer end of the negative electrode main grid line 22, so that adjacent battery cells can be connected in series with each other by the extended first connection section 213 and second connection section 223.
Of course, the structure in which the outer ends of the positive electrode main grid lines 21 and the negative electrode main grid lines 22 extend outward to form the first connection sections 213 and the second connection sections 223 is illustrative, and in other embodiments, a plurality of first connection sections 213 extending in a horizontal direction and in a direction away from the battery body 1 are provided at intervals in a vertical direction on the first grid line 211 in the outermost positive electrode main grid line 21, and a plurality of second connection sections 223 extending in a horizontal direction and in a direction away from the battery body 1 are provided at intervals in a vertical direction on the third grid line 221 in the outermost negative electrode main grid line 22, respectively, may also be other structures, for example, referring to fig. 1. In this way, it is possible to facilitate the series connection of adjacent battery pieces.
In some embodiments, the back contact battery further includes a plurality of pads 4, at least some of the pads 4 being spaced apart from the positive and negative main gate lines 21, 22. For example, referring to fig. 2, a plurality of bonding pads 4 may be disposed at equal intervals on the first gate line 211 and the second gate line 212 of the positive main gate line 21, and a plurality of bonding pads 4 may be disposed at equal intervals on the third gate line 221 and the fourth gate line 222 of the negative main gate line 22, so that the bonding pads 6 may be easily bonded to the corresponding first gate line 211, second gate line 212, third gate line 221 and fourth gate line 222.
In other embodiments, the back contact battery piece may also include a plurality of bonding pads 4, at least some bonding pads 4 are disposed on the positive electrode main grid line 21 and the negative electrode main grid line 22 at intervals, at least some bonding pads 4 are disposed on the first connecting section 213 and the second connecting section 223, and the bonding strips 6 are respectively welded on the bonding pads 4 of the first connecting section 213 and the second connecting section 223 of two adjacent battery pieces in front and back, that is, one end of the bonding strip 6 is welded with the bonding pad 4 on the first connecting section 213 of the previous battery piece, and the other end is welded with the bonding pad 4 on the second connecting section 223 of the next battery piece, so as to realize the serial connection of the adjacent battery pieces. The stability of the welding of the adjacent battery cells can be improved by providing a plurality of pads 4 on the first and second connection sections 213 and 223.
In some embodiments, the back contact battery piece further includes a sub-grid line 3, where the sub-grid line 3 includes a plurality of positive sub-grid lines 31 and a plurality of negative sub-grid lines 32, where the plurality of positive sub-grid lines 31 are electrically connected to the positive main grid line 21, respectively, and the plurality of negative sub-grid lines 32 are electrically connected to the negative main grid line 22, respectively. In this way, the plurality of positive electrode sub-grid lines 31 and negative electrode sub-grid lines 32 can cover a larger cell area, and the dispersed current on the cell can be efficiently and rapidly collected to the corresponding positive electrode main grid line 21 and negative electrode main grid line 22.
In some embodiments, the positive electrode sub-gate line 31 is vertically connected to the positive electrode main gate line 21; the negative sub-gate line 32 is vertically connected to the negative main gate line 22. For example, the positive electrode auxiliary grid line 31 of the first grid line 211 connected to the positive electrode main grid line 21 is perpendicular to the extending direction of the first grid line 211, the positive electrode auxiliary grid line 31 of the second grid line 212 connected to the positive electrode main grid line 21 is perpendicular to the extending direction of the second grid line 212, the positive electrode auxiliary grid lines 31 are arranged at intervals and are respectively perpendicular to the extending directions of the first grid line 211 and the second grid line 212, the positive electrode auxiliary grid line 31 and the first grid line 211 and the second grid line 212 can be conveniently connected and can cover more battery piece areas, the positive electrode auxiliary grid line 31 on the first grid line 211 collects the current generated by lighting of the battery piece to the first grid line 211, and the current generated by lighting of the battery piece is collected to the second grid line 212 through the positive electrode auxiliary grid line 31 on the second grid line 212, so that the current collecting efficiency is improved; similarly, the negative electrode sub-gate line 32 connected to the third gate line 221 of the negative electrode main gate line 22 is perpendicular to the extending direction of the third gate line 221, and the negative electrode sub-gate line 32 connected to the fourth gate line 222 of the negative electrode main gate line 22 is perpendicular to the extending direction of the fourth gate line 222, so that the current can be collected to the third gate line 221 and the fourth gate line 222 through the negative electrode sub-gate line 32, thereby improving the current collection efficiency.
In addition, the positive sub-grid line 31 and the negative sub-grid line 32 are constructed in a shuttle shape or a zigzag shape for the convenience of production, saving materials, and further improving current collection efficiency.
In some embodiments, the back contact battery sheet further includes an insulating paste 5, and the insulating paste 5 is disposed at both ends of each positive electrode sub-gate line 31 and both ends of each negative electrode sub-gate line 32, respectively. In this way, the contact short between the adjacent positive sub-gate lines 31 and negative sub-gate lines 32 can be avoided by the insulating paste 5 provided at both ends of each positive sub-gate line 31 and each negative sub-gate line 32.
Note that, the positive electrode main gate line 21 may be formed by sintering aluminum paste, the negative electrode main gate line 22 may be formed by sintering silver paste, and the aluminum paste and the silver paste are formed by sintering the existing process, and specific processes thereof are not described herein.
The plurality of battery pieces are welded in series through the welding strip 6 to form a battery string, and the battery pieces can be whole battery pieces or sliced battery pieces. The welding may be infrared heating welding, electromagnetic welding, or hot air welding.
In a second aspect, the present disclosure provides a photovoltaic module comprising a plurality of the above back contact cells, the plurality of back contact cells being connected in series. For example, the photovoltaic module may further include a front side encapsulant layer and a cover plate, and a back side encapsulant layer and a back plate on the other side of the string, and the forming process of the photovoltaic module may be a lamination process. Therefore, the photovoltaic module formed by connecting the plurality of back contact battery pieces in series can generate electricity efficiently and transmit the generated electric energy to a power grid. In addition, the photovoltaic module has all the beneficial effects of the battery, and the description is omitted here.
The preferred embodiments of the present disclosure have been described in detail above with reference to the accompanying drawings, but the present disclosure is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solutions of the present disclosure within the scope of the technical concept of the present disclosure, and all the simple modifications belong to the protection scope of the present disclosure.
In addition, the specific features described in the foregoing embodiments may be combined in any suitable manner, and in order to avoid unnecessary repetition, the present disclosure does not further describe various possible combinations.
Moreover, any combination between the various embodiments of the present disclosure is possible as long as it does not depart from the spirit of the present disclosure, which should also be construed as the disclosure of the present disclosure.
Claims (10)
1. A back contact battery sheet, comprising:
a battery piece body;
the main grid line is arranged on the backlight side of the battery piece body and comprises at least one positive electrode main grid line and at least one negative electrode main grid line; the positive electrode main grid line and the negative electrode main grid line are both constructed into non-closed fold lines and are arranged at intervals.
2. The back contact battery of claim 1, wherein the positive main grid line and the negative main grid line are both zigzag folding lines and are nested with each other.
3. The back contact battery of claim 1, wherein the positive electrode main grid line and the negative electrode main grid line are both zigzag folding lines or step folding lines.
4. The back contact battery of claim 1, wherein a spacing between the positive electrode main grid line and the negative electrode main grid line is not less than 5mm.
5. The back contact battery cell according to claim 1, wherein the outer end of the positive electrode main grid line is formed with at least one first connection section;
and at least one second connecting section is formed at the outer end of the negative main grid line.
6. The back contact battery of any one of claims 1-5, further comprising a secondary grid line, the secondary grid line comprising a plurality of positive secondary grid lines and a plurality of negative secondary grid lines, the plurality of positive secondary grid lines being respectively electrically connected to the positive primary grid line, the plurality of negative secondary grid lines being respectively electrically connected to the negative primary grid line.
7. The back contact battery of claim 6, wherein the positive sub-grid and the negative sub-grid are configured in a shuttle or zigzag configuration.
8. The back contact battery of claim 5, further comprising a plurality of bonding pads, at least a portion of the bonding pads being spaced apart from the positive and negative main gate lines;
at least part of the bonding pads are arranged on the first connecting section and the second connecting section.
9. The back contact battery of claim 6, further comprising an insulating paste disposed at both ends of each of the positive sub-grid lines and both ends of each of the negative sub-grid lines, respectively.
10. A photovoltaic module comprising a plurality of back contact cells according to any one of claims 1 to 9, wherein a plurality of the back contact cells are connected in series.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222892895.7U CN219017666U (en) | 2022-10-31 | 2022-10-31 | Back contact battery piece and photovoltaic module |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222892895.7U CN219017666U (en) | 2022-10-31 | 2022-10-31 | Back contact battery piece and photovoltaic module |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219017666U true CN219017666U (en) | 2023-05-12 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202222892895.7U Active CN219017666U (en) | 2022-10-31 | 2022-10-31 | Back contact battery piece and photovoltaic module |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219017666U (en) |
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2022
- 2022-10-31 CN CN202222892895.7U patent/CN219017666U/en active Active
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