CN212625597U

CN212625597U - Solar cell with decoration and cell module

Info

Publication number: CN212625597U
Application number: CN202020997899.XU
Authority: CN
Inventors: 黄强; 刘双超; 闻乐; 刘非; 陆志强
Original assignee: Dongfang Risheng Yiwu New Energy Co ltd; Risen Energy Co Ltd
Current assignee: Dongfang Risheng Yiwu New Energy Co ltd; Risen Energy Co Ltd
Priority date: 2020-06-03
Filing date: 2020-06-03
Publication date: 2021-02-26
Anticipated expiration: 2030-06-03

Abstract

The utility model discloses a decorative solar cell, which comprises a solar cell piece and a plurality of metal electrodes deposited on the solar cell piece; according to the shape of the plurality of metal electrodes and the distribution positions of the plurality of metal electrodes on the solar cell, the plurality of metal electrodes reflect and interfere light differently, the metal conductive patterns formed by the plurality of metal electrodes present decorative patterns when viewed at a preset distance, the solar cell and the packaged solar cell module have attractiveness, and the problems that when the attractiveness of the solar cell and the solar cell module in the prior art is solved, an extra beautifying film layer or shielding object needs to be added to increase the packaging difficulty of the solar cell module during packaging, the packaging difficulty is large, the attractiveness is poor, and the like are solved. The utility model also discloses a solar module.

Description

Solar cell with decoration and cell module

Technical Field

The present invention relates to a solar cell production process, and more particularly to a solar cell and a solar cell module having a decorative feature.

Background

At present, photovoltaic power generation is a power generation technology for converting solar energy into electric energy by using the photovoltaic effect of semiconductors. In general, a common solar cell is a separation layer which forms positive and negative charges on the surface of a silicon wafer of 156mm-210mm in a doping mode; when the sun irradiates the surface of the silicon wafer, positive or negative charges in two single forms are respectively formed on the two surfaces of the silicon wafer, and the charges are collected by metal electrodes on the surfaces to realize external power supply. The metal electrode on the front surface of the battery is divided into the thin grid lines and the main grid lines, and current collection is realized through the thin grid lines and the main grid lines and is transmitted to the outside. In the using process, a layer of blue-black film is arranged on the surfaces of the battery units to serve as a protective film, then the battery units are connected through welding tapes and packaged in an EVA (ethylene-vinyl acetate copolymer)/POE (Polyolefin elastomer), a back plate and a transparent glass cover plate, and the photovoltaic module capable of resisting normal work in a severe environment in the nature is formed.

In the actual use process of the photovoltaic module, the transparent glass cover plate, the metal electrode on the surface of the battery, the welding strip, the blue-black film and the like can be observed by people from various angles from the bottom of the photovoltaic module; particularly, due to the physical principle of interference extinction, the blue-black film can generate different colors along with different observation angles, so that the attractiveness of the photovoltaic module is affected.

Currently, there are two main ways in the prior art to achieve the aesthetic appearance of solar modules:

one is to use a black back plate and a black polymer adhesive tape to shield the main grid line on the upper surface of the solar cell. Although this approach can change the uniformity of the appearance of the solar cell, it cannot eliminate the different color variations of the blue-black film depending on the viewing angle.

The second method is to add a camouflage cover layer on or under the glass cover plate. In a common method, a louver formed by colored polymer or a camouflage film with a metal ion deposition surface is added between a glass cover plate and an EVA (ethylene-vinyl acetate copolymer)/POE (Polyolefin elastomer) encapsulant film. As shown in fig. 1, a conventional solar cell module generally includes an upper glass cover 101, a decorative beautification film 102, a first encapsulation layer 103, a solar cell 105, a second encapsulation layer 107, and a lower glass cover 108, which are sequentially disposed from top to bottom. In order to ensure the aesthetic property of the solar cell module, the decoration beautification film layer 102 is added between the upper glass cover plate 101 and the first packaging layer 103. Although the method can greatly improve the aesthetic property of the photovoltaic module, the method is usually accompanied with the great reduction of the photoelectric conversion efficiency, so that the cost of a single watt of the solar panel is correspondingly improved, and the economical efficiency and the power generation capacity of the product are reduced.

SUMMERY OF THE UTILITY MODEL

In order to overcome the defects of the prior art, one of the objects of the present invention is to provide a solar cell with decoration, which can solve the problem of poor photoelectric conversion efficiency of the solar cell caused by the increase of decorative beautification film or shielding material during the packaging of the solar cell module in the prior art.

The utility model discloses a second purpose provides have decorative solar module, and it can solve among the prior art through increase decorative beautify rete or shelter from the thing and lead to solar cell's the poor scheduling problem of photoelectric conversion efficiency when solar module encapsulates.

The utility model discloses an one of the purpose adopts following technical scheme to realize:

the solar cell with the decoration function comprises a solar cell sheet and a plurality of metal electrodes deposited on the solar cell sheet; according to the shape of the plurality of metal electrodes and the distribution positions of the plurality of metal electrodes on the solar cell sheet, the plurality of metal electrodes have different reflections and interferences to light, so that a metal conductive pattern formed by the plurality of metal electrodes presents a decorative pattern when viewed from a preset distance.

Further, the shape of the metal electrode comprises the height, width, length, and angle of the top section of the metal electrode to the surface of the solar cell.

Further, the height difference between the plurality of metal electrodes ranges from 60nm to 150 nm.

Further, the surface of the top of the one or more metal electrodes is provided with a color coating.

Further, the solar cell includes any one of the following cells: heterojunction cell, black silicon cell, PERC cell, TOPCON cell and laminated cell composed of the above cell and other thin film cell.

Further, the metal electrode is composed of any one or more of the following metals: metallic silver, metallic copper and metallic aluminum.

The second purpose of the utility model is realized by adopting the following technical scheme:

a solar cell module with decoration, the solar cell module comprising a front cover plate, a first adhesive layer, a plurality of solar cells, a second adhesive layer and a back cover plate; the solar cell is arranged between the first bonding layer and the second bonding layer; the front cover plate is arranged on the first bonding layer, and the rear cover plate is arranged below the second bonding layer; each solar cell is a decorative solar cell adopted as one of the purposes of the invention.

Further, adjacent solar cells are connected in series by a solder-coated ribbon between the metal electrodes of the corresponding solar cells.

Further, each solar cell includes a plurality of cell slices, and edge portions of adjacent cell slices are connected together in series in a stacked manner such that each cell slice is divided into an overlapping portion and a non-overlapping portion; the adjacent cell slices are connected in series by metal electrodes corresponding to the overlapped portions of the cell slices.

Further, the thickness of the metal electrode at the overlapped portion of the slice of the battery piece is thinner than that of the metal electrode at the non-overlapped portion of the slice of the battery piece.

Compared with the prior art, the beneficial effects of the utility model reside in that:

the utility model improves the shape of the metal electrodes on the cell piece of the solar cell and the distribution positions on the cell piece, so that a plurality of metal electrodes form a metal conductive pattern; the plurality of metal electrodes on the cell piece have different reflection and interference characteristics under the irradiation of light, so that a metal conductive pattern formed by the plurality of metal electrodes presents a decorative pattern, the solar cell has attractiveness, the problems that in the prior art, the photoelectric conversion efficiency of the solar cell is reduced when beautification is realized by adding a decorative beautifying film layer or other shielding objects when a solar cell module is packaged and the like are solved, and meanwhile, the packaging difficulty and the packaging cost are reduced.

Drawings

Fig. 1 is a schematic view of a package structure of a solar cell module in the prior art;

fig. 2 is a schematic diagram of a metal electrode having a height difference on a solar cell provided by the present invention;

fig. 3 is a schematic diagram of a metal electrode having an angular difference in a top cross section of a solar cell provided by the present invention;

fig. 4 is a schematic view illustrating that a plurality of grooves are formed on the surface of the laser transfer film according to the present invention;

FIG. 5 is a schematic view of a metal conductor formed by filling a conductive metal paste in the trench of FIG. 4;

FIG. 6 is a schematic view of the metal conductor in FIG. 5 being transferred to a cell sheet to form a metal electrode;

fig. 7 is a schematic view of a solar cell provided by the present invention having a color coating on the surface of the top of the metal electrode;

fig. 8 is a schematic view illustrating a groove provided on a surface of an electrode carrier film according to the present invention;

FIG. 9 is a schematic view of the conductor formed after filling the trench of FIG. 8 with a conductive metal paste;

FIG. 10 is a schematic illustration of the conductive metal paste being plated on the conductive body of FIG. 9 to form a metal electrode;

fig. 11 is a schematic view of the metal electrode formed in the groove of the electrode carrier film being attached to the cell sheet;

FIG. 12 is a schematic view of filling a conductive metal film layer in the trench of FIG. 8;

FIG. 13 is a schematic view of a conductive metal paste deposited on the conductive metal film layer in FIG. 12 to form a metal electrode;

fig. 14 is a schematic view of a packaging structure of a solar cell module according to the present invention;

FIG. 15 is a vertical cross-sectional schematic view of FIG. 14;

fig. 16 is a second schematic view of a packaging structure of a solar cell module according to the present invention;

fig. 17 is a vertical cross-sectional schematic view of fig. 16.

In the figure: 101. a glass cover plate is arranged; 102. a decorative beautifying film layer; 103. a first encapsulation layer; 105. a solar cell; 107. a second encapsulation layer; 108. a lower glass cover plate; 400. a metal electrode; 401. a battery piece; 402. a first metal electrode; 403. a second metal electrode; 404. a first color-over layer; 405. a second color-coating layer; 406. a conductive adhesive; 505. a trench; 504. laser transfer printing film; 503. a metal conductor; 600. an electrical conductor; 602. an electrode carrier film; 700. a conductive metal film layer; 201. a front cover plate; 203. a first adhesive layer; 204. a first solar cell; 205. coating a tin welding strip; 206. a second solar cell; 207. a second adhesive layer; 208. a rear cover plate; 300. and (5) slicing the battery piece.

Detailed Description

The present invention will be further described with reference to the accompanying drawings and the detailed description, and it should be noted that the embodiments or technical features described below can be arbitrarily combined to form a new embodiment without conflict.

Example one

The utility model provides a preferred embodiment is through the aesthetic property requirement of considering battery piece and battery in the manufacturing process to solar cell to make the battery pack that forms after the solar cell encapsulation have the aesthetic property.

Namely: the aesthetic property of the solar cell is realized through different designs of the plurality of metal electrodes on the solar cell, and meanwhile, the series resistance of the solar cell can be reduced, so that the aesthetic property of the solar cell is ensured, the generating capacity and the heat conducting property of the solar cell module are improved, and the weak light power generation capacity and the high temperature power generation capacity of the solar cell and the solar cell module are improved.

Generally, when a solar cell operates, when sunlight irradiates the surface of a silicon wafer of the solar cell, positive or negative charges of two single forms are respectively formed on the two surfaces of the silicon wafer, and the charges are collected through a metal electrode deposited on the surface of the silicon wafer to supply power to the outside. Therefore, the power generation capability, the thermal conductivity, and the like for the solar cell are all related to the metal electrode on the solar cell sheet.

The utility model provides a have decorative solar cell, the shape and the distribution position through the metal electrode of deposit on the battery piece to solar cell carry out different designs, have not only strengthened solar cell and solar module's aesthetic property, can also improve solar module's generating capacity and heat conductivility etc. simultaneously.

A solar cell with decoration comprises a solar cell sheet and a plurality of metal electrodes deposited on the solar cell sheet. For convenience of description, the solar cell is simply referred to as a cell, that is, the cell described herein refers to a solar cell.

Wherein, a plurality of metal electrodes are deposited on the battery piece, and the plurality of metal electrodes form a metal conductive pattern. According to the shape of the plurality of metal electrodes and the distribution positions on the cell, the plurality of metal electrodes have different reflection and interference characteristics to light, so that the metal conductance pattern formed by the plurality of metal electrodes presents a decorative pattern when viewed from a preset distance. The preset distance referred herein can be set according to the actual situation, generally, when the solar cell module is used, the solar cell module needs to be installed on equipment or a device with a corresponding height from the ground, and power generation is realized by receiving the sunlight; the height of the utility model from the ground is different in different use occasions.

Preferably, the shape of the metal electrode includes, but is not limited to: the height, width, length, angle of the top section and the surface of the cell piece, etc. of the metal electrode. The distribution positions of the metal electrodes refer to the distribution positions of the metal electrodes on the battery piece. That is, different metal conductive patterns can be formed on a plurality of metal electrodes by setting different shapes of the metal electrodes and different distribution positions of the metal electrodes on the cell, so that different decorative patterns can be shown when different metal conductive patterns are viewed at a preset distance, and the attractiveness of the solar cell and the cell module is realized. Because the utility model provides a solar cell itself has certain aesthetic property, consequently when encapsulating into battery pack to solar cell, just need not increase decorative packaging layer or other decorative films etc. and realize battery pack's aesthetic property like among the prior art, has reduced the encapsulation degree of difficulty and encapsulation cost.

In addition, because the metal electrodes on the silicon wafer of the solar cell in the prior art only have a conductive function, the metal electrodes are generally printed by metal silver (Ag) paste while ensuring the conductive function, the height of the metal electrodes is controlled within 15-25 um, and the consumption of the metal silver paste per metal electrode is reduced as much as possible, for example, the total consumption of the metal silver paste per cell is 100-200 mg. Therefore, the amount of the metal paste used for the metal electrode of each cell is small, which leads to a decrease in the amount of power generation of the solar cell. In addition, since these metal electrodes only have a function of conducting electricity, they are generally arranged on the silicon wafer in a grid shape, and the metal electrodes also do not have a function of shielding the color of the silicon wafer.

And the utility model discloses a metal electrode on the battery piece not only has only electrically conductive function, and every metal electrode all has the typical meaning, and the shape of a plurality of metal electrodes and the distribution position on the battery piece all are correlated with the decorative pattern that metal conductive pattern presented. When sunlight irradiates the cell, the plurality of metal electrodes generate different reflection and interference characteristics to light due to different corresponding shapes and distribution positions of the metal electrodes, so that the formed corresponding metal conductive patterns present decorative patterns, and the beautifying functions of the solar cell and the solar cell module are realized.

Therefore, the utility model discloses shape to metal electrode, such as height, width, length, top cross-section and the angle on battery piece surface etc. all have certain regulation, consequently the utility model discloses do not do the restriction to metal electrode's quantity, set for according to specific design demand can. Because the utility model discloses do not limit to the quantity of metal electrode, consequently the utility model discloses for using the relatively poor base metal of other electric conductive property to the material selection of metal electrode provides probably. That is, the metal electrode can be prepared not only by using metal silver paste as in the prior art, but also by using metal copper (Cu) paste, metal aluminum (Al) paste, paste in which metal silver and metal copper are mixed, or other conductive metal paste, so that the limitation of the material type of the metal electrode of the battery has expandability.

Therefore, the utility model discloses not only realized solar cell's function of beautifying, still carried out corresponding extension to metal electrode's material simultaneously, for using other relatively poor other metals of electric conductive property to provide probably, also for reducing solar cell's preparation cost provides probably, greatly reduced the electric conductivity requirement to metal electrode's material, provide probably for reducing metal electrode's cost. In addition, because the utility model discloses do not do the restriction on the quantity and the material of metal electrode, also provide the possibility for improving solar cell's generating capacity.

In addition, the present invention provides an embodiment in which the metal conductive pattern formed by the plurality of metal electrodes deposited on the battery plate is different from the network-shaped pattern formed by the metal electrodes on the battery plate in the prior art. The utility model discloses an in the manufacturing process, the distribution position to metal electrode's shape and on the battery piece designs, and then makes a plurality of metal electrode form different metal conductive pattern, because different metal electrode are to the reflection and the interference characteristic of light under shining of light for corresponding metal conductive pattern can demonstrate different textures, have decorative pattern, improve the aesthetic property greatly.

Preferably, the decorative pattern may be wood grain, marble, granite, or the like, which is different according to the shape and distribution position of the plurality of metal electrodes on the battery sheet.

Preferably, when the metal conductive pattern presents a decorative pattern, different bright and dark effects of the pattern are formed under the irradiation of light due to the different shapes and distribution positions of the different metal electrodes. Specifically, such as when there is a height difference between different metal electrodes, the metal conductive pattern may form a bright-dark effect of the decorative pattern under irradiation of light; when the top sections of different metal electrodes have an angle difference, the metal conductive pattern can form a bright and dark effect of a decorative pattern under the irradiation of light. That is to say, the decorative pattern formed by the metal conductive pattern under the irradiation of light is related to the shape and distribution position of the metal electrode on the battery plate, the utility model discloses the following specific example is specifically given to illustrate the preparation process of the metal electrode on the battery plate, specifically as follows:

when a plurality of metal electrodes have a height difference therebetween: due to the fact that the metal electrodes with different heights have different light reflection and interference characteristics, when sunlight irradiates on the cell, the decorative patterns displayed by the metal conductive patterns have different shades.

Preferably, as shown in fig. 2, a height difference is formed between the first metal electrode 402 and the second metal electrode 403 on the battery sheet 401. According to the difference of the preparation technology of the metal electrode, the utility model provides a following preparation of multiple preparation method to the metal electrode on the battery piece 401 to make the difference in height between the different metal electrodes.

The preparation method comprises the following steps: the height difference of the plurality of metal electrodes is realized through a screen printing process.

Preferably, the present embodiment is illustrated by the height difference between two metal electrodes on the cell 401:

as shown in fig. 2, in the preparation process of the battery piece: firstly, printing conductive metal paste on a battery piece 401 to form a first metal electrode 402 and a second metal electrode 403; then, the second metal electrode 403 is overprinted once again, so that the height of the first metal electrode 402 is different from that of the second metal electrode 403; at this time, a height difference is generated between the first metal electrode 402 and the second metal electrode 403.

That is, the number of times of printing for the second metal electrode 403 is different from the number of times of printing for the first metal electrode 402, so that the second metal electrode 403 and the first metal electrode 402 have a height difference.

That is, the utility model discloses a mode of chromatography makes on the battery piece 401 that the printing number of times of a plurality of metal electrodes is different, realizes the difference in height of a plurality of metal electrodes on the battery piece 401.

The second preparation method comprises the following steps: the height difference of different metal electrodes is realized through an electroplating process.

As shown in fig. 2, a conductive metal paste is first plated on a cell 401 and a first metal electrode 402 and a second metal electrode 403 are generated; then, the second metal electrode 403 is electroplated once again, so that the first metal electrode 402 and the second metal electrode 403 have different heights; at this time, a height difference is generated between the first metal electrode 402 and the second metal electrode 403.

Namely, the electroplating times of different metal electrodes are different through a multi-time overprinting electroplating mode, and the height difference of the different metal electrodes is realized.

Preferably, due to the characteristics of the electroplating process, the utility model can also control the deposition rate of each metal electrode by controlling the electroplating current density of different metal electrodes in the electroplating process, so as to realize the height difference of different metal electrodes. Such as: in the electroplating process, different growth rates of the first metal electrode 402 and the second metal electrode 403 can be realized by applying different current densities to the first metal electrode 402 and the second metal electrode 403; therefore, after the electroplating is completed, the first metal electrode 402 and the second metal electrode 403 have different heights; at this time, a height difference is generated between the first metal electrode 402 and the second metal electrode 403.

Preferably, the difference in height of the different metal electrodes is greater than or equal to 60 nm. Preferably, the difference in height between the different metal electrodes is 60nm to 150 nm.

In addition, the decorative pattern in the present invention is to perform light interference modulation on sunlight due to the difference in the shape and distribution position of the metal electrode of the cell 401 when the sunlight irradiates the cell 401, thereby forming light and dark textures of the decorative pattern. The light wave of the sunlight is a white light wave, and comprises various visible light waves, and the wavelengths of the different visible light waves are different. When the height difference between different metal electrodes is different, the light and shade textures formed by the light rays are also different.

The light with the specific wavelength lambda is emitted into the film with the refractive index n according to the extinction formula of the light interference, and the extinction effect can be achieved when nd is lambda/4, so that the light with the specific wavelength can not be reflected back. Ideally, the light would be perfectly absorbed in its entirety. Where d is the thickness of a thin film material (e.g., an encapsulant material for a solar cell).

The visible light wavelength is assumed to be considered to be 380 nm-760 nm; wherein the wavelength range of the red light is 760nm to 622 nm; wavelength range of orange light: 622nm to 597 nm; yellow light wavelength range: 597nm to 577 nm; green light wavelength range: 577 nm-492 nm; cyan wavelength range: 492-450 nm; blue light wavelength range: 450 nm-435 nm; violet wavelength range: 435 nm-390 nm.

Setting commonly used packaging materials EVA, POE and PVB of the photovoltaic cell module, wherein the refractive index of the packaging materials is 1.3-1.6.

When the visible light is red light, assuming that the refractive index of the encapsulant has a minimum value n of 1.3 and the wavelength has a maximum value λ of 760, the red light is extinguished (i.e. absorbed), and the height difference between the metal electrodes needs to be 146 nm.

When the visible light is violet, assuming that the refractive index of the encapsulant has a maximum value n of 1.6 and the wavelength has a maximum value λ of 760, the violet light is extinguished (i.e., absorbed), and the height difference between the metal electrodes needs to be 61 nm.

Therefore, based on the above calculation, the height difference of the present invention for different metal electrodes is preferably 60nm to 150 nm.

That is to say, as long as the height difference of the different metal electrodes on the cell 401 is within 60nm to 150nm, the solar cell and the solar cell module can be observed at different angles, and the metal conductive pattern on the cell 401 shows different light and shade effects due to the reflection and interference characteristics of different light rays caused by the height difference of the metal electrodes on the cell 401, so as to realize the aesthetic function of the solar cell and the solar cell module.

When there is an angular difference between the top sections of the plurality of metal electrodes: due to the angle difference between the top sections of the different metal electrodes, when sunlight irradiates the cell piece 401, the patterns presented by the metal conductive patterns have different shades. As shown in fig. 3, the top section a of the first metal electrode 402 has an angular difference with the top section B of the second metal electrode 403.

Generally, the top cross section of the metal electrode in the prior art is parallel to the surface of the battery piece 401. The utility model discloses a have certain angle between with different metal electrode's top cross-section and battery piece 401 surface, like this, when the light struck battery piece 401 on, because metal electrode's top cross-section has certain inclination for battery piece 401 when surperficial, can make metal conductive pattern demonstrate corresponding light and shade effect.

Preferably, according to the different preparation processes of the metal electrode, the utility model provides a preparation of the metal electrode on the battery piece 401 by following multiple preparation methods, thereby make the top cross-section of different metal electrodes have the angular difference between:

the preparation method comprises the following steps: and realizing the angle difference of the top sections of the plurality of metal electrodes through a laser transfer printing process.

As shown in fig. 4-6, the third preparation method comprises the following steps:

first, a plurality of grooves 505 having various shapes are provided on the surface of the laser transfer film 504. Wherein, the bottom section of the trench 505 has an angle (the angle is greater than zero) with the surface of the laser transfer film 504; i.e., there is an angular difference between the bottom sections of the different trenches 505. In this embodiment, a plurality of grooves 505 are formed on the laser transfer film 504 through a metal cutting tool grooving process or a die lamination process.

Then, each trench 505 is filled with a conductive metal paste.

Then, the excess conductive metal paste on the surface of the laser transfer film 504 is scraped off, so that a first metal conductor 503 is formed in each trench 505.

Finally, the first metal conductor 503 formed in each groove 505 is transferred onto the surface of the cell 401 through a laser heating process, so as to form a plurality of metal electrodes 400 on the cell 401.

Since there is an angular difference between the bottom cross-sections of the different trenches 505, there is also an angular difference between the top cross-sections of the shaped first metallic conductors 503 formed within the trenches 505, and therefore there is also an angular difference between the top cross-sections of the metallic electrodes 400 formed when the first metallic conductors 503 within each trench 505 are transferred to the surface of the cell sheet 401 by the laser heating process.

From the above, when the metal electrodes 400 are prepared on the cell piece 401 by the laser transfer process, the shape of each metal electrode 400 is the same as the shape of the first metal conductor 503 formed in the corresponding groove 505 and the shape of the corresponding groove 505.

When the depths of the grooves 505 on the laser transfer film 504 are different, the heights of the correspondingly formed metal electrodes 400 are also different, and therefore, the preparation method is simultaneously suitable for the height difference of different metal electrodes 400. Therefore, the third preparation method is also suitable for preparing the metal electrodes 400, so that height differences are formed between different metal electrodes 400 on the battery piece 401.

In the same way as the first preparation method or the second preparation method, the present invention can also realize the angle difference of the top cross sections of different metal electrodes 400 by means of multiple overprinting.

In the same way as the preparation method, the present embodiment further provides another preparation method, as shown in fig. 8 to 13, not only the height difference of the different metal electrodes 400 can be realized by the electrode carrier film 602, but also the angle difference of the top sections of the different metal electrodes 400 can be realized. The preparation method comprises the following steps:

first, various shapes of grooves 505 are fabricated on electrode carrier film 602. Similarly, similar to the laser transfer process, grooves 505 with various shapes may be formed on the electrode carrier film 602 by a metal knife grooving process or a die lamination process. The shape of the trench 505 includes the depth of the trench 505, the angle between the bottom cross section of the trench 505 and the surface of the electrode carrier film 602, and the size of the trench 505.

Then, a conductive metal paste is filled in each trench 505 and a corresponding metal electrode 400 is formed.

Finally, each metal electrode 400 is attached to the cell sheet 401 to form a solar cell.

Preferably, the present embodiment combines the metal electrode 400 with a conductive substance on the surface of the cell piece 401 through the metal conductive adhesive 406, so that the metal electrode 400 is fixed on the surface of the cell piece 401, forming the solar cell.

The metal conductive adhesive 406 is a conductive metal paste or a conductive tape. The conductive material on the surface of the battery piece 401 may be a conductive film, a conductive metal paste, or the like. The conductive metal paste is one or a combination of a plurality of metal silver paste, metal copper paste, metal aluminum paste and other metal pastes. Due to the expansion of the material types of the metal electrode 400, the conductive metal slurry used in the preparation process can be correspondingly expanded.

Further, depending on the process of filling the conductive metal paste into the groove 505 of the electrode carrier film 602, the following two schemes are also adopted when the conductive metal paste is filled into the groove 505 of the electrode carrier film 602.

The first scheme is as follows: as shown in fig. 9-10, filling the conductive metal paste in the trench 505 of the electrode carrier film 602 specifically includes:

first, a conductive metal paste is printed and filled in each trench 505 through a printing process, and after all trenches 505 are filled, excess conductive metal paste remaining on the surface of the electrode carrier film 602 is removed through a doctor blade, so that a second metal conductor 600 is formed in each trench 505.

Then, a conductive metal paste is plated on each second metal conductor 600 by an electroplating process so that each second metal conductor 600 extends to an area outside the electrode carrier film 602, thereby forming a protruding metal electrode 400.

Scheme II: as shown in fig. 12 to 13, filling the conductive metal paste in the trench 505 of the electrode carrier film 602 specifically includes:

firstly, conductive metal paste is deposited in each groove 505 through a sputtering process, a conductive metal film layer 700 is formed in each groove 505, and after all the grooves 505 are deposited, redundant conductive metal paste on the surface of the electrode carrier film 602 is removed through polishing.

A conductive metal paste is then deposited on the conductive metal film layer 700 within each trench 505 by a plating process such that the conductive metal film layer 700 extends to an area outside the electrode carrier film 602, thereby forming a protruding metal electrode 400.

Preferably, the surface of the top of the one or more metal electrodes 400 is also provided with an upper color layer. The surface of the top of the different metal electrodes 400 is made to have different colors by coating the corresponding upper color layers on the surface of the top of the different metal electrodes 400, so that the aesthetic function of the battery piece 401 is realized.

As shown in fig. 7, the surface of the top of the first metal electrode 402 is colored to form a first upper color layer 404. The surface of the top of the second metal electrode 403 is colored to form a second upper color layer 405. The first upper color layer 405 and the second upper color layer 404 may be the same or different in color. Wherein, the coloring method for the surface of the top of the metal electrode 400 is implemented by a rubbing technique. The rubbing technology is preferably rubbing technology of inscriptions of the Western-Ansheng inscriptions.

The utility model forms a metal conductive pattern by depositing a plurality of metal electrodes 400 on a battery piece 401; and through the shape that sets up a plurality of metal electrodes 400 for the metal conductive pattern demonstrates the pattern of different textures under the irradiation of light, realizes the pleasing to the eye function of cell piece 401, has solved among the prior art and need increase shelter from the thing or increase and beautify the rete and lead to the decline of solar cell's photoelectric conversion efficiency, increase encapsulation cost, the encapsulation degree of difficulty etc. of battery when making solar cell and solar module have decorative pleasing to the eye.

And simultaneously, because the utility model provides a metal electrode 400 not only has electrically conductive function, and every metal electrode 400 all has the typical meaning, simultaneously the utility model discloses do not make the restriction to metal electrode 400's thick liquids quantity, therefore make metal electrode 400's thick liquids not only confine the metallic silver thick liquids that prior art adopted, also can be for the relatively poor base metal of other electric conductive properties, reduced the electric conductivity requirement to metal electrode 400's material, provide probably for the cost that reduces metal electrode 400.

In addition, when the metal electrode 400 is made of other metal copper, metal aluminum and the like with poor conductivity, the series resistance of the solar cell can be greatly reduced, and the low-amplitude power generation performance is improved; meanwhile, the amount of the slurry of the metal electrode 400 is increased, so that the power generation capacity of the solar cell is greatly improved, and the heat dissipation performance of the solar cell is also improved.

Preferably, the battery provided by the present invention can be for any one of the following types of batteries: heterojunction battery, black silicon Cell, PERC (Passivated emitter and Rear Cell), TOPCON (Passivated Contact Cell) battery and the laminated Cell that above battery and other thin-film batteries constitute etc. above battery all can adopt the utility model provides a structure and preparation method that have decorative solar Cell realize solar Cell's beautification. Among them, the thin film battery is preferably a perovskite thin film battery, a sulfide thin film battery, or the like.

Example two

Based on the solar cell provided by the first embodiment, the present invention further provides another embodiment of a solar cell module, as shown in fig. 14 to 17, comprising a front cover plate 201, a first adhesive layer 203, a solar cell, a second adhesive layer 207, and a back cover plate 208.

The solar cell is disposed between the first adhesive layer 203 and the second adhesive layer 207, the front cover plate 201 is disposed above the first adhesive layer 203, and the back cover plate 208 is disposed below the second adhesive layer 207.

Preferably, the first adhesive layer 203 and the second adhesive layer 207 are composed of an EVA (ethylene-vinyl acetate copolymer), POE (Polyolefin elastomer), or PVB (polyvinyl butyral) material, which can bond different members together during the encapsulation of the battery pack.

Preferably, the front cover plate 201 and the rear cover plate 208 are both glass cover plates.

Preferably, the solar cell is the solar cell with decoration provided in the first embodiment. As shown in fig. 1 and 14, in order to enhance the aesthetic appearance of the solar cell module, a decorative beautification film layer 102 is added between the upper glass cover plate 101 and the first encapsulation layer 103 in the prior art.

The utility model provides a solar cell who adopts among the solar module has decorative solar cell for this embodiment provides, consequently, the utility model provides a solar module need not increase decorative beautify rete 102 between front shroud 201 and first bond line 203, but through the metal conductive pattern that forms by a plurality of metal electrodes demonstrate have different textures, have decorative pattern, realize solar cell's aesthetic function, greatly reduced solar module's the encapsulation cost and the encapsulation degree of difficulty.

Preferably, the solar cell is provided in plurality, and the adjacent solar cells are electrically connected with each other. The number of solar cells is 2 n. Wherein n is a natural number greater than or equal to 1.

In this embodiment, two solar cells are used to specifically describe the connection manner between the solar cells, specifically, two solar cells are assumed to be respectively set as the first solar cell 204 and the second solar cell 206, and the first solar cell 204 is electrically connected to the second solar cell 206.

As shown in fig. 14-15: the first solar cell 204 and the second solar cell 206 are connected in series by a solder-coated strip 205 between metal electrodes on the respective solar cells.

That is, adjacent solar cells are connected in series by the solder-coated solder strips 205 between the metal electrodes on the corresponding solar cells, so that a plurality of solar cells are connected in series, and then the plurality of solar cells are bonded together by the first adhesive layer 203 and the second adhesive layer 207, and finally the front cover plate 201 and the rear cover plate 208 are encapsulated to form the solar cell module.

Preferably, the solder-coated strip 205 between the metal electrodes is zigzag shaped so that the metal electrodes on adjacent solar cells are connected together in series.

Secondly, as shown in fig. 16-17: the first solar cell 204 and the second solar cell 206 are each divided into a plurality of cell slice slices 300.

A plurality of the battery piece slices 300 are connected in series in a lamination manner. That is, edge portions of the neighboring cell slice 300 are connected in series in a stacked manner such that each cell slice 300 is divided into an overlapped portion and a non-overlapped portion; and the neighboring cell slice 300 is electrically connected by the metal electrode corresponding to the overlapped portion of the cell slice 300. Preferably, the metal electrodes of the two battery sheet slices 300 may be electrically connected by coating a conductive paste on the metal electrodes of the overlapped portions of the battery sheet slices 300.

Preferably, the thickness of the metal electrode of the overlapped portion of the battery slice 300 of the present invention is thinner than the thickness of the metal electrode of the non-overlapped portion of the battery slice 300.

The thickness of the metal electrode can be achieved by the aforementioned electroplating process, screen printing process, and the like. That is, in the process of manufacturing the cell, different positions of each metal electrode on the cell, the shape of each metal electrode, and the like are designed, so that the solar cell module has a certain decorative and beautifying effect after the cell is packaged into the solar cell module.

The above embodiments are only preferred embodiments of the present invention, and the protection scope of the present invention cannot be limited thereby, and any insubstantial changes and substitutions made by those skilled in the art based on the present invention are all within the protection scope of the present invention.

Claims

1. The solar cell with the decoration function is characterized by comprising a solar cell sheet and a plurality of metal electrodes deposited on the solar cell sheet; according to the shape of the plurality of metal electrodes and the distribution positions of the plurality of metal electrodes on the solar cell sheet, the plurality of metal electrodes have different reflections and interferences to light, so that a metal conductive pattern formed by the plurality of metal electrodes presents a decorative pattern when viewed from a preset distance.

2. The solar cell with decoration according to claim 1, wherein the shape of the metal electrode comprises the height, width, length, and angle of the top section of the metal electrode to the surface of the solar cell sheet.

3. The decorative solar cell as claimed in claim 1, wherein the height difference between the plurality of metal electrodes ranges from 60nm to 150 nm.

4. The decorative solar cell as claimed in claim 1, wherein the surface of the top of one or more metal electrodes is provided with a color coating.

5. The ornamental solar cell as claimed in claim 1, wherein the solar cell comprises any one of the following cells: heterojunction cell, black silicon cell, PERC cell, TOPCON cell and laminated cell composed of the above cell and other thin film cell.

6. The decorative solar cell of claim 1, wherein the metal electrode is comprised of any one or more of the following metals: metallic silver, metallic copper and metallic aluminum.

7. A solar cell module with decoration, characterized in that the solar cell module comprises a front cover plate, a first adhesive layer, a plurality of solar cells, a second adhesive layer and a back cover plate; the solar cell is arranged between the first bonding layer and the second bonding layer; the front cover plate is arranged on the first bonding layer, and the rear cover plate is arranged below the second bonding layer; each solar cell is the solar cell with decoration according to any one of claims 1 to 6.

8. The ornamental solar cell module as claimed in claim 7, wherein the adjacent solar cells are connected in series by a solder-coated ribbon between the metal electrodes of the corresponding solar cells.

9. The decorative solar cell module as claimed in claim 7, wherein each solar cell comprises a plurality of cell slices, and edge portions of adjacent cell slices are connected in series in a stacked manner such that each cell slice is divided into an overlapped portion and a non-overlapped portion; the adjacent cell slices are connected in series by metal electrodes corresponding to the overlapped portions of the cell slices.

10. The solar cell module with decoration according to claim 9, wherein the thickness of the metal electrode of the overlapped part of the sliced cell sheet is thinner than that of the metal electrode of the non-overlapped part of the sliced cell sheet.