Same-color low-cost heterojunction cell and assembly
By using silver-clad copper electrodes and dark film layers in heterojunction solar cells, combined with electrode solder joints and TCO film layers, the problems of high cost and visual inconsistency caused by electrodes are solved, achieving low-cost all-black design and easy soldering.
Patent Information
- Application Number
- CN202422339029.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-25
- Publication Date
- 2025-12-12
- Estimated Expiration
- 2034-09-25
AI Technical Summary
The presence of electrodes in existing technologies prevents heterojunction solar cells from achieving an all-black design, which is aesthetically unappealing, and the use of pure silver as electrodes results in excessively high production costs.
Silver-clad copper electrodes are used and wrapped with a dark film layer. Electrode solder joints and TCO film layers are set to reduce costs and improve visual uniformity.
It achieves a low-cost all-black design, avoids oxidation of silver-plated copper, reduces the amount of pure silver used, and improves soldering convenience and visual uniformity.
Smart Images
Figure CN223666703U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of solar cell technology, specifically to a low-cost heterojunction cell and module with the same color scheme. Background Technology
[0002] With the continuous growth of ground-mounted photovoltaic (PV) installations, land resources and related policy restrictions are becoming key factors hindering the large-scale development of PV. Rooftop PV's natural environmental advantages and full utilization of energy and resources have driven its development. As rooftop PV becomes more widespread, more and more users, besides prioritizing power generation, are also demanding aesthetic appeal. Industry technicians have developed all-black color schemes for the modules to ensure a unified black visual effect and seamless integration of PV with the building. One example of a black module in existing technology includes a black frame and a module body within the frame. The module body, from top to bottom, comprises a transparent cover, a first encapsulating film, a solar cell array, a second encapsulating film, and a backsheet, thus achieving the fabrication of an all-black module.
[0003] However, due to the presence of electrodes, it is impossible to achieve a completely black finish, which is not aesthetically pleasing. Furthermore, existing technologies use pure silver as electrodes, requiring a huge amount of pure silver paste, resulting in excessively high production costs for heterojunction solar cells. Utility Model Content
[0004] The purpose of this invention is to provide a low-cost heterojunction battery and module with the same color scheme, which solves the technical problems in the prior art where the presence of electrodes makes it impossible to achieve a completely black finish, resulting in an unsightly appearance, and where the prior art uses pure silver as electrodes, requiring a huge amount of pure silver paste, leading to excessively high production costs for heterojunction batteries.
[0005] This utility model discloses a low-cost heterojunction battery with the same color scheme, including a silver-coated copper electrode, wherein the silver-coated copper electrode is wrapped with a protective layer, and the protective layer is a dark film layer.
[0006] Working principle: By setting a silver-coated copper electrode on a pure silver electrode, the electrode manufacturing cost can be reduced. By setting the protective layer to a dark film, the oxidation of copper particles in the silver-coated copper can be avoided, and the color of the protective layer can be made consistent with the color of the battery.
[0007] Furthermore, the silver-coated copper electrode is provided with electrode solder joints, which divide the silver-coated copper electrode into multiple segments. The electrode solder joints are used for welding welding wires. The protective layer has gaps that expose the electrode solder joints. The electrode solder joints are made of pure silver.
[0008] By setting electrode solder joints, the silver-clad copper can be divided into multiple segments, which facilitates the welding of the solder wire.
[0009] Furthermore, 4-7 electrode solder points are uniformly arranged along the length of the pure silver electrode.
[0010] Furthermore, the height of the electrode solder joint is not less than the thickness of the silver-clad copper electrode.
[0011] By setting the height of the electrode solder joints, the silver-clad copper electrodes are not exposed, thus reducing the use of pure silver while ensuring the solder joint effect.
[0012] Furthermore, the protective layer is a silicon nitride or TCO film.
[0013] Furthermore, a pure silver electrode is disposed between the silver-coated copper electrode and the battery, and the pure silver electrode is wrapped in a protective layer.
[0014] Furthermore, the battery also includes a silicon wafer, with an amorphous layer, a microcrystalline layer and a conductive film layer sequentially disposed away from the silicon wafer, and the pure silver electrode disposed on the conductive film layer.
[0015] Furthermore, the conductive film layer is a TCO conductive film.
[0016] Furthermore, the TCO conductive film is configured as two layers.
[0017] Furthermore, a first TCO film and a second TCO film are sequentially disposed away from the silicon wafer.
[0018] Furthermore, the first TCO film has a thickness of 100-120 nm and a refractive index of 1.9-2.2; the second TCO film has a thickness of 80-100 nm and a refractive index of 1.6-1.9.
[0019] By setting the thickness and refractive index of the first and second TCO films, it is easier to adjust the color to be the same as the protective layer. The overall color can be a deep blue, which can form a better visual color unity with the protective layer color.
[0020] Furthermore, the front microcrystalline layer of the battery is an N-doped microcrystalline layer, and the back microcrystalline layer of the battery is a P-doped microcrystalline layer.
[0021] By adding N-doped and P-doped microcrystalline layers, the transmittance and conductivity of the microcrystalline layers can be improved.
[0022] A low-cost heterojunction solar cell module with the same color scheme, comprising the aforementioned heterojunction solar cell.
[0023] Compared with the prior art, the beneficial effects of this utility model are:
[0024] 1. By setting a silver-clad copper electrode on a pure silver electrode, the electrode manufacturing cost can be reduced;
[0025] 2. By setting the protective layer to a dark film, the oxidation of copper particles in the silver-coated copper can be avoided, and the color of the protective layer can be made consistent with the color of the battery;
[0026] 3. By setting electrode solder joints, the silver-clad copper can be divided into multiple segments, which facilitates the welding of the solder wire;
[0027] 4. By setting the height of the electrode solder joints, the silver-coated copper electrodes are not exposed, thus reducing the use of pure silver while ensuring the solder joint effect;
[0028] 5. By setting the thickness and refractive index of the first and second TCO films, it is easier to adjust the color to be the same as the protective layer. The overall color can be dark blue, which can form a better visual unity with the color of the protective layer. Attached Figure Description
[0029] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.
[0030] Figure 1 This is a schematic diagram of the cross-sectional structure of the heterojunction battery of this utility model.
[0031] Figure 2 This is a cross-sectional view of the heterojunction battery of this utility model from another angle.
[0032] In the above figures, the meanings of each mark are as follows: 1-pure silver electrode, 2-silver-clad copper electrode, 3-protective layer, 4-electrode solder joint, 5-silicon wafer, 6-amorphous layer, 7-microcrystalline layer, 8-conductive film layer, 9-first TCO film, 10-second TCO film. Detailed Implementation
[0033] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments.
[0034] Example 1
[0035] The technical solution adopted in this embodiment is as follows:
[0036] like Figures 1-2As shown, a low-cost heterojunction battery and module of the same color scheme includes a silver-coated copper electrode 2, which is wrapped by a protective layer 3, which is a dark-colored film layer.
[0037] Working principle: By setting a silver-coated copper electrode 2 on a pure silver electrode 1, the electrode manufacturing cost can be reduced. By setting the protective layer 3 to a dark-colored film, the copper particles in the silver-coated copper can be prevented from being oxidized, and the color of the protective layer 3 can be made consistent with the color of the battery.
[0038] Example 2
[0039] This embodiment is a preferred embodiment of the present invention, and its specific structure is as follows: Figures 1-2 As shown, based on embodiment 1, the following improvements are disclosed: the silver-coated copper electrode 2 is provided with electrode solder joints 4, the electrode solder joints 4 divide the silver-coated copper electrode 2 into multiple segments, the electrode solder joints 4 are used for welding welding wire, the protective layer 3 is provided with gaps exposing the electrode solder joints 4, and the electrode solder joints 4 are made of pure silver.
[0040] By setting electrode solder points 4, the silver-coated copper can be divided into multiple segments, which facilitates the welding of the solder wire.
[0041] Example 3
[0042] In this embodiment, which is a preferred embodiment of the present invention, the following improvements are disclosed based on embodiment 2: a pure silver electrode 1 is disposed between the silver-coated copper electrode 2 and the battery, the pure silver electrode 1 is wrapped by a protective layer 3, five electrode solder joints 4 are evenly disposed along the length of the pure silver electrode 1, the height of the electrode solder joints 4 is not less than the thickness of the silver-coated copper electrode 2, and the protective layer 3 is silicon nitride. In some embodiments, the protective layer 3 is a TCO film.
[0043] By setting the height of electrode solder joint 4, the silver-coated copper electrode 2 will not be exposed, thus reducing the use of pure silver while ensuring the solder joint effect.
[0044] Example 4
[0045] This embodiment is a preferred embodiment of the present invention, and its specific structure is as follows: Figures 1-2 As shown, based on embodiment 2, the following improvement is disclosed: the battery further includes a silicon wafer 5, and an amorphous layer 6, a microcrystalline layer 7 and a conductive film layer 8 are sequentially disposed away from the silicon wafer 5, and the pure silver electrode 1 is disposed on the conductive film layer 8.
[0046] Example 5
[0047] This embodiment is a preferred embodiment of the present invention, and its specific structure is as follows: Figure 1-2As shown, based on embodiment 4, the following improvement is disclosed: the conductive film layer 8 is a TCO conductive film.
[0048] Example 6
[0049] This embodiment is a preferred embodiment of the present invention, and its specific structure is as follows: Figures 1-2 As shown, based on embodiment 5, the following improvement is disclosed: the TCO conductive film is configured as two layers.
[0050] Example 7
[0051] This embodiment is a preferred embodiment of the present invention, and its specific structure is as follows: Figures 1-2 As shown, based on embodiment 6, the following improvement is disclosed: a first TCO film 9 and a second TCO film 10 are sequentially arranged in the direction away from the silicon wafer 5. The first TCO film 9 has a thickness of 100-120 nm and a refractive index of 1.9-2.2; the second TCO film 10 has a thickness of 80-100 nm and a refractive index of 1.6-1.9.
[0052] By setting the thickness and refractive index of the first TCO film 9 and the second TCO film 10, the overall color can be dark blue, which can form a better visual color unity with the color of the protective layer 3.
[0053] Example 8
[0054] In this embodiment, which is a preferred embodiment of the present invention, the following improvements are disclosed based on embodiment 7: the front microcrystalline layer 7 of the battery is an N-doped microcrystalline layer 7, and the back microcrystalline layer 7 of the battery is a P-doped microcrystalline layer 7.
[0055] By setting N-doped microcrystalline layer 7 and P-doped microcrystalline layer 7, the transmittance and conductivity of microcrystalline layer 7 can be improved.
[0056] The above are the embodiments listed in this example. However, this example is not limited to the optional embodiments described above. Those skilled in the art can arbitrarily combine the above methods to obtain other various embodiments. Anyone can derive other various forms of embodiments based on the inspiration of this example. The above specific embodiments should not be construed as limiting the scope of protection of this example. The scope of protection of this example should be determined by the claims, and the specification can be used to interpret the claims.
Claims
1. A low-cost heterojunction battery with the same color scheme, characterized in that: It includes a silver-coated copper electrode (2), which is wrapped by a protective layer (3), which is a dark film layer; The silver-coated copper electrode (2) is provided with electrode solder joints (4), which divide the silver-coated copper electrode (2) into multiple segments. The electrode solder joints (4) are used for welding welding wire. The protective layer (3) is provided with gaps that expose the electrode solder joints (4). The electrode solder joints (4) are made of pure silver.
2. The low-cost heterojunction battery with the same color scheme as described in claim 1, characterized in that: The height of the electrode solder joint (4) is not less than the thickness of the silver-coated copper electrode (2).
3. The low-cost heterojunction battery with the same color scheme as described in claim 1, characterized in that: The protective layer (3) is a silicon nitride or TCO film.
4. The low-cost heterojunction battery with the same color scheme as described in claim 1, characterized in that: A pure silver electrode (1) is disposed between the silver-coated copper electrode (2) and the battery, and the pure silver electrode (1) is wrapped by a protective layer (3).
5. A low-cost heterojunction battery with the same color scheme as described in claim 4, characterized in that: The battery also includes a silicon wafer (5), and an amorphous layer (6), a microcrystalline layer (7) and a conductive film layer (8) are sequentially disposed away from the silicon wafer (5), and the pure silver electrode (1) is disposed on the conductive film layer (8).
6. A low-cost heterojunction battery with the same color scheme as described in claim 5, characterized in that: The conductive film layer (8) is a TCO conductive film.
7. A low-cost heterojunction battery with the same color scheme as described in claim 6, characterized in that: The TCO conductive film is configured as two layers.
8. A low-cost heterojunction battery with the same color scheme as described in claim 7, characterized in that: A first TCO film (9) and a second TCO film (10) are sequentially disposed in a direction away from the silicon wafer (5).
9. A low-cost heterojunction battery module with the same color scheme, characterized in that: A low-cost heterojunction battery with the same color scheme as described in any one of claims 1-8.