AU2021203356B2

AU2021203356B2 - Solar cell and method for preparing the same, solar cell module including the same

Info

Publication number: AU2021203356B2
Application number: AU2021203356A
Authority: AU
Inventors: Qiang Huang; Fei Liu; Shuangchao LIU; Zhiqiang Lu; Le WEN
Original assignee: Risen Energy Co Ltd
Current assignee: Risen Energy Co Ltd
Priority date: 2020-06-03
Filing date: 2021-05-24
Publication date: 2022-09-15
Anticipated expiration: 2041-05-24
Also published as: AU2021203356A1; WO2021243794A1; CN111653633A

Abstract

The present disclosure relates to a solar cell including a solar cell sheet and a plurality of metal electrodes. The plurality of metal electrodes are disposed on the solar cell pate at intervals and define a metal pattern. The plurality of metal electrodes are in geometry shaped, and at least 5 two of the plurality of metal electrodes are different, so that the metal pattern is a decorative pattern when viewed at a preset distance. The present disclosure further relates to a method for preparing the solar cell and a use of a solar cell module containing the solar cell. 101 102 103 105 107 108 FIG. 1 402 403 401 FIG. 2 402 B \\6A 403 401 FIG. 3 504 505 FIG. 4

Description

102

103

105 107

108

FIG. 1

402

403

401

FIG. 2 402 B \\6A 403

401

FIG. 3 504

505

FIG. 4

SOLAR CELL AND METHOD FOR PREPARING THE SAME, SOLAR CELL MODULE INCLUDING THE SAME TECHNICAL FIELD

[0001] The present disclosure relates to solar cells, in particular to a solar cell and a method for preparing the same, and a solar cell module including the same.

BACKGROUND

[0002] At present, photovoltaic power generation is a power generation technology that uses the photovoltaic effect of semiconductors to convert solar energy into electrical energy. In general, conventional solar cells can include a separation layer of positive charge and negative charge which is prepared on a surface of a silicon wafer having a size of 156mm-210mm by doping. When the sun irradiates a surface of the silicon wafer, two kinds of electric charge (positive or negative) are independently formed on two surfaces of the silicon wafer, respectively, which can be collected by metal electrodes on the surface of the silicon wafer to supply power to the external. Among them, the metal electrodes on a top surface of the solar cell can be divided into thin grid lines and main grid lines, and a current can be collected and conveyed to the external via the thin grid lines and the main grid lines. When being used, a blue-black film is provided on a surface of the solar cell as a protective film. Then a plurality of solar cells are connected by welding stripes, and packaged in EVA (ethylene-vinyl acetate copolymer)/POE (Polyolefin elastomer), rear panel and transparent glass cover plate to form a photovoltaic module that can withstand normal operation in the harsh environment of nature.

[0003] When the photovoltaic module is actually used, the transparent glass cover plate, the metal electrodes on the surface of the solar cell, the welding stripe, the blue-black film, etc. can be shown from the bottom of the photovoltaic module with various viewing angles. Moreover, due to interference extinction principle, the blue-black film will show different colors from different viewing angles, which will affect the aesthetics of the photovoltaic module.

[0004] At present, there are two methods to improve the aesthetics of the solar cell module.

[0005] In a first method, black rear panel and black polymer tape are used to cover the main grid lines on the top surface of the solar cell. This can make the solar cell more uniform, but cannot avoid color changes when the solar cell is observed from different view angles.

[0006] In a second method, a camouflage covering layer is added on the glass cover plate or under the glass cover plate. A common way is to add a colored polymer shutter or a camouflage film with a metal ion deposition surface between the glass cover plate and the EVA (ethylene vinyl acetate copolymer)/POE (Polyolefin elastomer) packaging film. As shown in FIG. 1, the conventional solar cell module generally includes a first glass cover plate 101, a decorative membrane 102, a first encapsulation layer 103, a solar cell 105, a second encapsulation layer 107 and a second glass cover plate 108, which are successively arranged from top to bottom. In order to ensure the aesthetics of the solar cell module, a decorative membrane 102 can be added between the first glass cover plate 101 and the first encapsulation layer 103. Although this method can greatly improve the aesthetics of photovoltaic modules, photoelectric conversion efficiency often significantly decreases, which increases the cost of a single solar cell sheet and reduces the economic efficiency and power generation capacity of the product.

SUMMARY

[0007] In order to overcome defects of the conventional art, the present disclosure provides a solar cell and a method for preparing the same, so as to improve photoelectric conversion efficiency of the solar cell module and to decrease difficulty and cost of packaging.

[0008] A solar cell includes a solar cell sheet and a plurality of metal electrodes. The plurality of metal electrodes are disposed on the solar cell pate at intervals and define a metal pattern. The plurality of metal electrodes are geometric structures, and at least two of the plurality of metal electrodes are different, resulting in the metal pattern being a decorative pattern when viewed at a preset distance.

[0009] In some embodiments, the at least two of the plurality of metal electrodes are in different geometry shapes; and/or, at least two of the plurality of metal electrodes are in different size.

[0010] In some embodiments, the at least two of the plurality of metal electrodes are in different height, and a difference between the heights of the at least two of the plurality of metal electrodes is larger than or equals to 60 nm.

[0011] In some embodiments, the difference between the heights of the at least two of the plurality of metal electrodes is in a range of 60 nm to 150 nm

[0012] In some embodiments, a first angle defined by a top surface of one of the at least two of the plurality of metal electrodes and a surface of the solar cell sheet is different from a second angle defined by a top surface of the other of the at least two of the plurality of metal electrodes and the surface of the solar cell sheet.

[0013] In some embodiments, a material of the plurality of metal electrodes includes at least one of silver, copper and aluminum.

[0014] In some embodiments, a colored coating is disposed on a surface away from the solar cell sheet of at least one of the plurality of metal electrodes.

[0015] In some embodiments, the solar cell is selected from a heterojunction cell, a stacked cell composed of a heterojunction cell and a thin film cell, a black silicon cell, a stacked cell composed of a black silicon cell and a thin film cell, a passivated emitter and rear cell, a stacked cell composed of a passivated emitter and rear cell and a thin film cell, a passivated contact cell, and a stacked cell composed of a passivated contact cell and a thin film cell.

[0016] A method for preparing the solar cell includes following steps: providing the solar cell sheet, and forming the plurality of metal electrodes on the solar cell sheet to obtain the solar cell, wherein the plurality of metal electrodes are disposed on the solar cell pate at intervals and define the metal pattern, the plurality of metal electrodes are in geometry shaped, and at least two of the plurality of metal electrodes are different.

[0017] In some embodiments, the step of forming the plurality of metal electrodes on the solar cell sheet is as follows: forming the plurality of metal electrodes on the solar cell sheet by a method of silk-screen printing, wherein the plurality of metal electrodes are prepared by printing with different numbers of printing, resulting in adjacent two of the plurality of metal electrodes being in different height.

[0018] In some embodiments, the step of forming the plurality of metal electrodes on the solar cell sheet is as follows: forming the plurality of metal electrodes on the solar cell sheet by a method of electroplating, wherein a deposition velocity of different metal electrodes is controlled by controlling electric current density of electroplating, resulting in adjacent two of the plurality of metal electrodes being in different height.

[0019] In some embodiments, the step of forming the plurality of metal electrodes on the solar cell sheet is as follows: forming the plurality of metal electrodes on the solar cell sheet by a method of electroplating, wherein, the plurality of metal electrodes are prepared by electroplating with different numbers of electroplating, resulting in adjacent two of the plurality of metal electrodes being in different height.

[0020] In some embodiments, the step of forming the plurality of metal electrodes on the solar cell sheet includes following steps:

step Si1, preparing a plurality of grooves with different shapes on a laser transfer printing membrane;

step S12, filling a metal electric conductive slurry in each of the plurality of grooves to form the plurality of metal electrodes and removing excessive metal electric conductive slurry from the surface of the laser transfer printing membrane; and

step S13, transferring and printing the plurality of metal electrodes from the plurality of grooves to a surface of the solar cell sheet.

[0021] In some embodiments, the step S12 of filling the metal electric conductive slurry in each of the plurality of grooves to form the metal electrode and removing the excessive metal electric conductive slurry from the surface of the laser transfer printing membrane includes:

filling the metal electric conductive slurry in each of the plurality of grooves by printing, and after the filling, removing the excessive metal electric conductive slurry from the surface of the laser transfer printing membrane with a scraper, so as to form an electric conductor in each of the plurality of grooves; and, electroplating the metal electric conductive slurry on each of the electric conductors, resulting in each of the electric conductors extending out from the laser transferring printing membrane to obtain the plurality of metal electrodes.

[0022] In some embodiments, the step of forming the plurality of metal electrodes on the solar cell sheet includes:

step S21, preparing a plurality of grooves with different shapes on an electrode carrier membrane;

step S22, filling a metal electric conductive material in each of the plurality of grooves to form the plurality of the metal electrodes; and

step S23, pasting the plurality of metal electrodes on the surface of the solar cell sheet, and electrically connecting each of the plurality of metal electrodes with the solar cell sheet, thereby disposing the electrode carrier membrane on the solar cell sheet.

[0023] In some embodiments, the step S22 offilling the metal electric conductive material in each of the plurality of grooves to form the plurality of the metal electrodes includes: filling the metal electric conductive slurry in each of the plurality of grooves by printing, and after the filling, removing the excessive metal electric conductive slurry from the surface of the laser transfer printing membrane with a scraper, so as to form the electric conductor in each of the plurality of grooves; electroplating the metal electric conductive slurry on each of the electric conductors, resulting in each of the electric conductors extending out from the laser transferring printing membrane to obtain the plurality of metal electrodes

[0024] In some embodiments, the step S22 offilling the metal electric conductive material in each of the plurality of grooves to form the plurality of the metal electrodes includes: depositing a metal electric conductive membrane in each of the plurality of grooves by sputtering, and after completing the depositing process, removing excess metal electric conductive membrane from the surface of the electrode carrier membrane by polishing; and depositing the metal electric conductive slurry on each of the electric conductive membranes by electroplating, resulting in the electric conductive membrane extending out from each of the electric conductive membranes to form the plurality of metal electrodes.

[0025] In some embodiment, the step S23 of pasting the plurality of metal electrodes on the surface of the solar cell sheet, electrically connecting each of the plurality of metal electrodes with the solar cell sheet, thereby disposing the electrode carrier membrane on the solar cell sheet includes: bonding each of the plurality of metal electrodes to an electric conductive material on the solar cell sheet via a metal electric conductive adhesive, and electrically connecting each of the plurality of metal electrodes with the solar cell sheet, wherein the metal electric conductive adhesive is a metal electric conductive slurry or an electric conductive adhesive tape; and, the electric conductive material on the surface of the solar cell sheet is an electric conductive membrane or a metal electric conductive slurry.

[0026] In some embodiments, the metal electric conductive slurry includes at least one of silver slurry, copper slurry and aluminum slurry.

[0027] A solar cell module includes a second cover plate, a second adhesive layer, a first battery, a first adhesive layer and a first cover plate, wherein the second adhesive layer, the first battery, the first adhesive layer and the first cover plate are successively stacked on the second cover plate,

[0028] In some embodiment, the adjacent two of the solar cells are electrically connected in series by a tin-coated welding stripe.

[0029] In some embodiment, the tin-coated welding stripes are disposed in Z-shaped.

[0030] A solar cell module includes a second cover plate, a second adhesive layer, a second battery, a first adhesive layer and a first cover plate, wherein the second adhesive layer, the second battery, the first adhesive layer and the first cover plate are successively stacked on the second cover plate. The second battery includes at least two slices of the solar cells of above, and adjacent two slices of the solar cells are electrically connected.

[0031] In some embodiment, the adjacent two slices of the solar cells are electrically connected as following: the adjacent two slices of the solar cells are partly stacked to form an overlapping area, and metal electrodes of the adjacent two of the solar cells are connected in series.

[0032] In some embodiment, an electric conductive glue layer is disposed on the surface of the metal electrodes in the overlapping area.

[0033] In some embodiment, a height of the metal electrodes extending from the solar cell sheet in the overlapping area is lower than a height of the metal electrodes extending from the solar cell sheet which is not in the overlapping area.

[0033a] In one aspect, the present disclosure provides a solar cell, characterized in that, the solar cell comprises a solar cell sheet and a plurality of metal electrodes, the plurality of metal electrodes are disposed on the solar cell sheet at intervals and define a metal pattern, the plurality of metal electrodes are geometric structures, and at least two of the plurality of metal electrodes are different, wherein the at least two of the plurality of metal electrodes are in different geometry shapes, and at least two of the plurality of metal electrodes are in different sizes, the at least two of the plurality of metal electrodes are in different heights, and a difference between the heights of the at least two of the plurality of metal electrodes is in a range of 60 nm to 150 nm, resulting in the metal pattern being shown as a decorative pattern when viewed at a preset distance.

[0034] In a solar cell of the present disclosure, a plurality of metal electrodes is disposed at intervals, and at least two of the plurality of metal electrodes are in different geometry shapes, so that the plurality of metal electrodes on a solar cell sheet can cause different reflection and interference. Therefore, a metal pattern defined by the plurality of metal electrodes can be decorative, and the solar cell can be aesthetic.

[0035] Furthermore, when the solar cell module is encapsulated with the solar cell of the present disclosure, a decorative membrane or other shelter is not required. Therefore, a

7a

photoelectric conversion efficiency of the solar cell module is effectively improved, and difficulty and cost of encapsulation is decreased at the same time.

BRIEF DESCRIPTION OF THE DRAWINGS

[0036] FIG. 1 is an encapsulation structural schematic diagram of a solar cell module in conventional art.

[0037] FIG. 2 is a schematic diagram of metal electrodes having different heights in a solar cell of the present disclosure.

[0038] FIG. 3 is a schematic diagram of metal electrodes in a solar cell of the present disclosure, wherein a first angle defined by a top surface of one of the metal electrodes and a surface of the solar cell is different from a second angle defined by a top surface of the other metal electrode and the surface of the solar cell.

[0039] FIG. 4 is a schematic diagram of a plurality of grooves disposed on a surface of a laser transfer printing membrane provided in the present disclosure.

[0040] FIG. 5 is a schematic diagram of a first metal electric conductor formed by filling a metal electric conductive slurry in a groove in FIG. 4.

[0041] FIG. 6 is a schematic diagram of a metal electrode formed by transferring printing the first metal electric conductor in FIG. 5 to a cell sheet.

[0042] FIG. 7 is a schematic diagram of a colored coating disposed on a surface away from the solar cell sheet of a metal electrode in the present disclosure.

[0043] FIG. 8 is a schematic diagram of a groove disposed on an electrode carrier membrane in the present disclosure.

[0044] FIG. 9 is a schematic diagram of a second metal electric conductor formed by filling a metal electric conductive slurry in the groove in FIG. 8.

[0045] FIG. 10 is a schematic diagram of a metal electrode formed by electroplating a metal electric conductive slurry on the second metal electric conductor in FIG. 9.

[0046] FIG. 11 is a schematic diagram showing how to paste a metal electrode formed in a groove of an electrode carrier membrane to a cell sheet.

[0047] FIG. 12 is a schematic diagram of a metal electric conductive membrane filed in the groove of FIG. 8.

[0048] FIG. 13 is a schematic diagram of a metal electrode formed by depositing a metal electric conductive slurry on the metal electric conductive membrane of FIG. 12.

[0049] FIG. 14 is an encapsulation structural schematic diagram of a solar cell module of a first embodiment provided in the present disclosure.

[0050] FIG. 15 is a cross-section view of FIG. 14.

[0051] FIG. 16 is an encapsulation structural schematic diagram of a solar cell module of a second embodiment provided in the present disclosure.

[0052] FIG. 17 is a cross-section view of the solar cell module in FIG. 16.

[0053] In the figures, 101 represents a first glass cover plate; 102 represents a decorative membrane; 103 represents a first encapsulation layer ; 105 represents a solar cell sheet; 107 represents a second encapsulation layer ; 108 represents a second glass cover plate; 400 represents a metal electrode; 401 represents a solar cell sheet; 402 represents a first metal electrode; 403 represents a second metal electrode; 404 represents a first colored coating; 405 represents a second colored coating; 406 represents an electric conductive adhesive; 505 represents a groove ; 504 represents a laser transfer printing membrane; 503 represents a first metal electric conductor ; 600 represents a second metal electric conductor; 602 represents an electrode carrier membrane; 700 represents an electrode conductive metal membrane; 201 represents a first cover plate ; 203 represents a first adhesive layer; 204 represents a first solar battery; 205 represents a tin-coated welding stripe; 206 represents a second solar battery; 207 represents a second adhesive layer; 208 represents a second cover plate; 300 represents a second battery.

DETAILED DESCRIPTION

[0054] The present disclosure will be further described with reference to the accompanying drawings and specific embodiments hereinafter. It should be noted that, provided that there is no conflict, the various embodiments described below or between various technical features can be arbitrarily combined to form a new embodiment.

[0055] The present disclosure can provide an embodiment a solar cell and a solar cell module. The solar cell can include a solar cell sheet and a plurality of metal electrodes. The solar cell module formed by encapsulating the solar cells can be aesthetic.

[0056] In a preparation of the solar cell, aesthetic is considered as a goal. Distribution positions and geometric structures of the plurality of metal electrodes on the solar cell sheet are designed, so as to ensure aesthetic of the solar cell sheet and decrease a series resistance of the solar cell sheet. This not only can ensure the aesthetic of the solar cell sheet, but also can improve electric energy production and thermal conductivity of the solar cell module, thereby improving power generation capacity with weak light and power generation capacity at high temperature of the solar cell and the solar cell module.

[0057] Generally, when the solar cell works, the sunlight irradiates a surface of a silicon wafer, and two kinds of electric charges are independently formed on two surfaces of the silicon wafer, respectively, which can be collected by the metal electrodes on the surfaces of the silicon wafer to supply power to the external. Therefore, both the power generation capacity and the heat conductive performance of the solar cell are related to the metal electrodes on the solar cell sheet.

[0058] In the solar cell of the present disclosure, distribution positions and geometric structures of the metal electrodes on the cell sheet of the solar cell sheet can be designed. This not only can improve aesthetic of the solar cell and the solar cell module, but also can improve the electric energy production and the thermal conductivity of the solar cell module.

[0059] The plurality of metal electrodes can be disposed on the solar cell sheet at intervals and define a metal pattern. The plurality of metal electrodes can be geometric structures, and at least two of the plurality of metal electrodes can be different, so that the plurality of metal electrodes can cause different reflection and interference, resulting in the metal pattern being shown as a decorative pattern when viewed at a preset distance.

[0060] In the present disclosure, the preset distance can be defined according to requirement. Generally, the solar cell module can be disposed on a device or instrument away from the ground when it is used, and generates electric power under the sunlight. In different working conditions, a distance between the solar cell module and the ground can be different.

[0061] In some embodiments, the at least two of the plurality of metal electrodes are in different geometry shapes; and/or, at least two of the plurality of metal electrodes are in different size.

[0062] In some embodiments, a first angle defined by a top surface of one of the at least two of the plurality of metal electrodes and a surface of the solar cell sheet can be different from a second angle defined by a top surface of the other of the at least two of the plurality of metal electrodes and the surface of the solar cell sheet. The top surface of the metal electrode can be a surface of the metal electrode away from the solar cell sheet. That is, an angle difference can be defined between top surfaces of at least two of the metal electrodes. In some embodiments, at least two of the plurality of metal electrodes can be different in at least one of height, width and length. In some embodiments, at least two of the plurality of metal electrodes can be different in height. The height of the metal electrode is defined as a height of the metal electrode extending from the surface of the solar cell sheet.

[0063] Therefore, by providing metal electrodes having different shapes and/or sizes and designing distribution positions of the metal electrodes on the solar cell sheet, different metal patterns can be formed by the plurality of metal electrodes, resulting in the metal pattern being shown as a decorative pattern when viewed at a preset distance. Therefore, the solar cell and the solar cell module are aesthetic.

[0064] In the present disclosure, the solar cell is aesthetic. When the solar cells are encapsulated to form the solar cell module, no decorative encapsulation layer or other decorative membrane is required. Therefore, difficulty and cost of encapsulation is reduced.

[0065] Furthermore, in conventional art, since metal electrodes on the silicon wafer of the solar cell have a property of conductivity. Therefore, in order to reduce cost of the metal electrodes while maintaining the electric conductive performance, the metal electrode is generally made by printing a silver (Ag) slurry. The height of the metal electrode can be in a range of 15 m to 25 m. Moreover, an amount of the silver slurry for one metal electrode can be minimized. In some embodiments, total consumption of the silver slurry for producing one solar cell sheet is in a range of 100 mg to 200 mg. Therefore, the electric power production of the solar cell is low, since the amount of metal slurry for the metal electrodes is small. Moreover, as these metal electrodes merely play a role of conducting electricity and are grid-shaped arranged on the silicon wafer, the metal electrodes cannot cover color of the silicon wafer.

[0066] In the present disclosure, not only the metal electrodes on the solar cell sheet can conduct electricity, but also each of the metal electrodes can play a particular role. Both geometry structures of the plurality of metal electrodes and the distribution positions of the plurality of metal electrodes can be related to the decorative pattern shown by the metal pattern.

When the sunlight irradiates the solar cell sheet, each of the plurality of metal electrodes can cause different reflection and interference, since the plurality of metal electrodes have different geometric structures and distribution positions. Therefore, the metal patterns can exhibit decorative patterns, resulting in aesthetic solar cells and solar cell module.

[0067] In the present disclosure, the shape and the size of the geometric structure of the metal electrodes is defined, hence a number of the metal electrodes is not limited, which can be set according to requirement. In the present disclosure, since the number of the metal electrode is not limited, some base metals having relatively poor electric conductivity can be used for producing the metal electrodes in the present disclosure. That is, not only silver slurry can be used for producing the metal electrode as that in conventional art, but also a copper (Cu) slurry, an aluminum (Al) slurry, a mixed slurry of silver and copper, other electric conductive slurry and the like can be used for preparing the metal electrode, resulting in that a material used for preparing metal electrode can be expanded.

[0068] Therefore, in the present disclosure, not only the solar cell is aesthetic, but also the material for producing the metal electrodes is diversified. Thus, other metals with a poor electric conductivity can be used to prepare the metal electrodes, and the cost of the metal electrodes can be reduced, and the cost of the solar cell can be further reduced. Moreover, in the present disclosure, since an amount and material of the metal electrode is not limited, it can be possible to improve electric energy production of the solar cell.

[0069] Furthermore, the metal pattern formed by the plurality of metal electrodes disposed on the solar cell sheet in the present disclosure is different from the grid-shaped pattern formed by the metal electrodes on the solar cell sheet in conventional art. In the present disclosure, the shape of the metal electrode and distribution positions of the solar cell sheet are designed, so that the plurality of metal electrodes can form different metal patterns. Under irradiation of the sunlight, different metal electrodes can cause different reflection and interference, so that the corresponding metal pattern can exhibit different textures or decorative and beautiful pattern.

[0070] In some embodiments, the decorative pattern can be in a wood grain shape, a marble shape, a granite shape and the like, according to the shapes and the distribution positions of the plurality of metal electrodes on the solar cell sheet.

[0071] In some embodiments, when the metal pattern is shown as the decorative pattern, the pattern can show light and shade under light irradiation because of different shapes and/or sizes of different metal electrodes and distribution positions of different metal electrodes. Specifically, when different metal electrodes have different heights, the metal pattern can show light and shade of the decorative pattern under light irradiation. When the angles defined by the top surface of different metal electrodes and the surface of the solar cell sheet are different, the metal pattern can show light and shade of the decorative pattern under light irradiation. That is, the decorative pattern formed by the metal pattern under light irradiation is related to the shape and/or size of the geometric structures of the metal electrodes and the distribution positions of the metal electrodes. A process for preparing the metal electrodes on the solar cell sheet will be described in conjunction with specific embodiments hereinafter.

[0072] When the height of the plurality of metal electrodes are different, the decorative pattern of the metal pattern can show light and shade when the solar light irradiates the solar cell sheet, since the metal electrodes having different heights can cause different reflection and interference of light.

[0073] As shown in FIG. 2, a height of afirst metal electrode 402 and a height of a second metal electrode 403 on the solar cell sheet 401 can be different. In the present disclosure, a plurality of methods are provided for preparing the metal electrodes on the solar cell sheet 401, so that heights of different metal electrodes can be different.

[0074] In a first method, the plurality of metal electrodes having different heights can be prepared by silk-screen printing.

[0075] In the present embodiments, how to prepare two metal electrodes having a height difference on the solar cell sheet 401 is described as below.

[0076] Referring to FIG. 2, a method for preparing the solar cell sheet 401 can include following steps. Firstly, printing a metal electric conductive slurry on the solar cell sheet 401 to form the first metal electrode 402 and the second metal electrode 403. Then, printing the second metal electrode 403 again, so that a height of the first metal electrode 402 is different from a height of the second metal electrode 403. At this time, there is difference between the heights of the first metal electrode 402 and the second metal electrode 403.

[0077] That is, a number of printing times of the second metal electrode 430 is different from that of the first metal electrode 402, resulting in the difference between the height of the second metal electrode 403 and the height of the first metal electrode 402.

[0078] That is, in the present disclosure, by carrying out printing for a plurality of times, the numbers of printing times of the metal electrodes on the solar cell sheet 401 are different, so that the plurality of metal electrodes on the solar cell sheet 401 have different heights.

[0079] In some embodiments, the plurality of metal electrodes having different heights can be prepared by electroplating.

[0080] Referring to FIG. 2, firstly, electroplating a metal electric conductive slurry on the solar cell sheet 401 to form afirst metal electrode 402 and a second metal electrode 403. Then, electroplating the second metal electrode 403 again, so that a height of the first metal electrode 402 is different from a height of the second metal electrode 403. At this time, there is difference between the height of the first metal electrode 402 and the height of the second metal electrode 403.

[0081] That is, a number of electroplating times of the second metal electrode 430 is different from a number of electroplating times of the first metal electrode 402, resulting in the difference between the height of the second metal electrode 403 and the height of the first metal electrode 402.

[0082] In some embodiments of the present disclosure, a deposition velocity of different metal electrodes can be controlled by controlling electric current density of electroplating according to a character of the electroplating, resulting in each of the plurality of metal electrodes being in different height. For example, during the electroplating process, an electric current density of the first metal electrode 402 and an electric current density of the second metal electrode 403 can be different, so that the deposition velocities of the first metal electrode 402 and the second metal electrode 403 can be different. Thus, after completing the electroplating process, the first metal electrode 402 and the second metal electrode 403 can have different heights. At this time, there can be difference between the height of the first metal electrode 402 and the height of the second metal electrode 403.

[0083] In some embodiments, a difference between the heights of different metal electrodes can be larger than or equals to 60 nm. In some embodiments, the difference between the heights of different metal electrodes can be in a range of 60 nm to 150 nm.

[0084] Furthermore, in the present disclosure, when solar light irradiates the solar cell sheet 401, different shapes and/or sizes and different distribution positions of the geometric structure of the metal electrodes on the solar cell sheet 401 can cause interference modulation, resulting in light and shade stripes of the decorative pattern. The solar light is a white light including a plurality of visible lights, and wavelengths of different visible lights are different. When the differences between the heights of different electrodes are different, the light and shade stripes formed by the light are different.

[0085] According to the extinction formula, when a light having a wavelength of irradiates a membrane having a refractive index of n, as long as n and L can meet a formula : nd = /4, the light will not be reflected back. In the ideal state, the light can be completely absorbed. Wherein, d is a thickness of the membrane (e.g., an encapsulation material of the solar cell).

[0086] A wavelength of visible light is in a range of 380 nm to 760 nm, wherein a wavelength of red light is in a range of 760 nm to 622 nm; a wavelength of orange light is in a range of 622 nm to 597 nm; a wavelength of yellow light is in a range of 597 nm to 577 nm; a wavelength of green light is in a range of 577 nm to 492 nm; a wavelength of cyan light is in a range of 492 nm to 450 nm; a wavelength of blue light is in a range of 450 nm to 435 nm; and a wavelength of purple light is in a range of 435 nm to 390 nm.

[0087] Generally, materials such as EVA, POE and PVB can be used as the encapsulation material of a photovoltaic cell module, and the reflective index of them can be in a range of 1.3 to 1.6.

[0088] When the visible light is the red light, suppose that the refractive index of the encapsulation material takes a minimum value (n=1.3) and the wavelength takes the maximum value (X=760 nm), a height difference between the metal electrodes should be 146 nm to extinct (i.e., absorbed) the red light.

[0089] When the visible light is the purple light, suppose that the refractive index of the encapsulation material takes a maximum value (n=1.6) and the wavelength takes the maximum value (X=760 nm), a height difference between the metal electrodes should be 61 nm to extinct (i.e., absorbed) the purple light.

[0090] Therefore, the difference between the heights of the different metal electrodes can be in a range of 60 nm to 150 nm.

[0091] That is, as long as the difference between the heights of the different metal electrodes is in a range of 60 nm to 150 nm, the metal pattern on the solar cell sheet 401 can show different light and shade effects from different viewing angles, since the difference between the heights of the different metal electrodes on the solar cell sheet 401 can cause different reflection and interference. Therefore, the solar cell and the solar cell module can be aesthetic.

[0092] When the angles defined by the top surfaces of the plurality of metal electrodes and the surface of the solar cell sheet are different, the metal pattern can show different light and shade when the solar light irradiates the solar cell sheet 401, since the angles defined by the top surfaces of the plurality of metal electrodes and the surface of the solar cell sheet are different. Referring to FIG. 3, a first angle defined by a top surface A of the metal electrode 402 and a surface of the solar cell sheet can be different from a second angle defined by a top surface B of the metal electrode 403 and the surface of the solar cell sheet.

[0093] In conventional art, all of the top surfaces of the metal electrodes are generally parallel to the surface of the cell sheet 401. In the present disclosure, angles can be defined by the top surfaces of different metal electrodes and the surface of the solar cell sheet 401. Therefore, when the light irradiates the solar cell sheet 401, the metal pattern can exhibit light and shade effects since angles can be defined by the top surface of the metal electrode and the surface of the solar cell sheet 401.

[0094] In some embodiments of the present disclosure, the metal electrodes on the solar cell sheet 401 can be prepared by a plurality of methods according to the processing method for preparing the metal electrodes, so that there can be difference between angles defined by the top surface of the metal electrodes and the surface of the solar cell.

[0095] In a third method, the plurality of metal electrodes can be prepared by laser transfer printing, wherein the angles defined by the top surfaces of the plurality of metal electrodes and the surface of the solar cell sheet can be different

[0096] Referring to FIG. 4 to FIG. 6, the method for preparing the plurality of metal electrodes can include the following steps:

[0097] Step S11, preparing a plurality of grooves 505 with different shapes on a surface of a laser transfer printing membrane 504. Wherein, a certain angle can be defined between a bottom cross-section of the groove 505 and a surface of the laser transfer printing membrane 504 (the angle is larger than zero). That is, different cross-sections of the plurality of grooves 504 can define an angle. Wherein, in the present embodiment, the plurality of grooves 505 can be disposed on the laser transfer printing membrane 504 by metal knife cutting process or mold pressing process.

[0098] Step S12, filling a metal electric conductive slurry in each of the plurality of grooves 505.

[0099] Step S13, removing the excessive metal electric conductive slurry from the surface of the laser transfer printing membrane 504.

[00100] Step S14, transferring and printing the first electric conductor 503 formed in each of the plurality of grooves 505 to a surface of the solar cell sheet 401 by laser heating process, and further forming a plurality of metal electrodes 400 on the solar cell sheet 401.

[00101] Due to angle differences between bottoms of the different grooves 505 of the plurality of grooves 505, there can be angle difference between top surfaces of the first electric conductors 503 formed in the grooves 505. Therefore, there can be degree difference between the top surfaces of the metal electrodes 400 formed by laser heating process to transfer and print the first metal electric conductors 503 in each of the grooves 404 to the surface of the solar cell sheet 401.

[00102] In view of above, while preparing the metal electrodes 400 on the solar cell sheet 401 by laser transfer printing, the shape of each of the metal electrodes 400 can be same as the first metal electric conductor 503 formed in the corresponding groove 505 and the corresponding groove 505.

[00103] When the plurality of grooves 505 on the laser transfer printing member 504 have different depths, the corresponding metal electrodes 400 can have different heights. Therefore, the method can be used to prepare metal electrodes 400 having different heights. Therefore, the third method can further be used to prepare metal electrodes 400, resulting in height difference of the metal electrodes 400 on the solar cell sheet 401.

[00104] Similar to the first method and the second method, metal electrodes 400 having top surfaces which can define different angles with the solar cell sheet can be prepared by printing for a plurality of times.

[00105] Similar to the third method, the present embodiment further provide a fourth method. Referring to FIG. 8 to FIG. 13, not only the metal electrodes 400 can have height differences, but also the top surfaces of different metal electrodes 400 can have angle differences. The fourth method can include the following methods.

[00106] Step S21, preparing a plurality of grooves 505 with different shapes on an electrode carrier membrane 602. Similar to laser transfer printing, a plurality of grooves 505 with different shapes can be cut on an electrode carrier membrane 602 by metal knife cutting process or mold pressing process. Wherein, a shape of the groove 505 can include a depth of the groove 505, an angle defined by a bottom cross-section of the groove 505 and the electrode carrier membrane 602, and a size of the groove 505.

[00107] Step S22, filling a metal electric conductive slurry in each of the plurality of grooves 505 to form the corresponding metal electrode 400.

[00108] Step S23, pasting the plurality of metal electrodes on the surface of the solar cell sheet 401 to form the solar cell.

[00109] In the present embodiment, the metal electrodes 400 can be bonded to an electric conductive material on the surface of the solar cell sheet via a metal electric conductive adhesive 406, resulting in the metal electrodes 400 fixed to the surface of the solar cell sheet 401 to form the solar cell.

[00110] Wherein, the metal electric conductive adhesive 406 can be a metal electric conductive slurry or an electric conductive adhesive tape. The electric conductive material on the surface of the solar cell sheet can be an electric conductive membrane or a metal electric conductive slurry. Wherein, the metal electric conductive slurry can include at least one of silver slurry, copper slurry and aluminum slurry, or a mixture thereof. Since the kinds of material for preparing the metal electrode 400 is expanded, a material for preparing the metal electric conductive slurry in the preparing process can further be expanded accordingly.

[00111] Furthermore, the step 22 can be further include the following two embodiments according to the method for filling the metal electric conductive slurry in the groove 505 of the electrode carrier membrane 602.

[00112] Embodiment 1

[00113] Referring to FIG. 9 to FIG. 10, step S22 can include: step S31, filling a metal electric conductive slurry in each of the plurality of grooves 505 by printing; and after completing the step of filling, removing excess metal electric conductive slurry from the surface of the electrode carrier membrane 602 with a scraper, so as to form a second metal electric conductor 600 in each of the plurality of grooves.

[00114] Step S32, electroplating metal electric conductive slurry on each of the second metal electric conductors 600, resulting in each of the second metal electric conductors 600 extending out from the electrode carrier membrane 602 to obtain the protruding metal electrode 400.

[00115] Embodiment 2

[00116] Referring to FIG. 12 to FIG. 13, step S22 can include: step S41, depositing a metal electric conductive membrane in each of the plurality of grooves 505 by sputtering to form a metal electric conductive membrane 700 in the plurality of grooves 505; and after completing depositing all of the plurality of grooves 505, removing excess metal electric conductive slurry from the surface of the electrode carrier membrane 602 by polishing.

[00117] Step S42, depositing a metal electric conductive slurry on each of the metal electric conductive membranes 700 in the plurality of grooves 505 by electroplating, resulting in the metal electric conductive membrane 700 extending out from the electrode carrier membrane 602 to form the protruding metal electrode 400.

[00118] In some embodiments, a colored coating can be disposed on a top surface of at least one of the plurality of metal electrodes 400. By coating corresponding colored coating on the top surface of different metal electrodes 400, the top surface of the metal electrode 400 can have different colors, resulting in aesthetic of the solar cell sheet 401.

[00119] Referring to FIG. 7, a top surface of the first metal electrode 402 is colored to form a first colored coating 404. A top surface of the second metal electrode 403 can be colored to form a second colored coating 405. The colors of the first colored coating 404 and the second colored coating 405 can be the same or the different. Wherein, the method for coloring the top surface of the metal electrode 400 can be rubbing. In some embodiments, the rubbing can be a method for rubbing monumental writings in Xi'an Beilin.

[00120] In the present disclosure, by depositing the plurality of metal electrodes 400 on the solar cell sheet 401 to form the metal pattern, and designing shapes and/or sizes of the geometric structure of the plurality of metal electrodes 400, the metal pattern can be shown as patterns having different textures under light irradiation, resulting in aesthetic of the solar cell sheet 401. This can solve problems (such as lower photoelectric conversion efficiency, increased cost and difficult for encapsulating the cell, and the like) conventional art caused by adding a shelter or decorative membrane to make the solar cell and the solar cell module aesthetic.

[00121] At the same time, in the present disclosure, not only the metal electrodes 400 in the present disclosure can conduct electricity, but also each of the metal electrodes 400 can play a particular role. Meanwhile, in the present disclosure, the amount of the slurry used for preparing the metal electrode 400 is not limited, thus the slurry for preparing the metal electrode 400 is not limited to the silver slurry in conventional art, but other base metals with relatively poor electric conductive performance can also be used for preparing the metal electrode 400. This can reduce the cost of the metal electrode 400.

[00122] Moreover, in the present disclosure, series resistance of the solar cell can be largely reduced by using other metals with relatively poor electric conductive performance (such as copper, aluminum, and the like) to prepare the metal electrode 400, resulting in slightly improving power generation. At the same time, since the amount of slurry is increased, the power generation of the solar cell can be largely improved, and heat dispersion property of the solar cell can further be improved.

[00123] In some embodiments, the solar cell of the present disclosure can be selected from any one of the following cells: a heterojunction cell, a stacked cell composed of a heterojunction cell and a thin film cell, a black silicon cell, a stacked cell composed of a black silicon cell and a thin film cell, a PERC (passivated emitter and rear cell), a stacked cell composed of a passivated emitter and rear cell and a thinfilm cell, a TOPCON (tunnel oxide passivated cell) passivated contact cell, and a stacked cell composed of a tunnel oxide passivated cell and a thin film cell. All the solar cells above can have a structure of the solar cell provided in the present disclosure, and be made by the methods in the present disclosure, resulting in aesthetic of the solar cell. Wherein, the thin film cell can include a perovskite thin film battery, a sulfide thin film battery, and the like.

[00124] Referring to FIG. 14 to FIG. 17, on the basis of the solar cell in the present disclosure, the present disclosure can further provide a solar cell module of the first embodiment, including a first cover plate 201, a first adhesive layer 203, a first battery, a second adhesive layer 207 and a second cover plate 208.

[00125] Wherein, the first battery can be disposed between the first adhesive layer 203 and the second adhesive layer 207. The first cover plate 201 can be disposed above the first adhesive layer 203, and the second cover plate 208 can be disposed below the second adhesive layer 207.

[00126] In some embodiments, the first adhesive layer 203 and the second adhesive layer 207 can be made of materials such as EVA (ethylene-vinyl acetate copolymer), POE (Polyolefin elastomer) or PVB (polyvinyl butyral), wherein different members can be pasted together during the encapsulation.

[00127] In some embodiments, both the first cover plate 201 and the second cover plate 208 can be glass.

[00128] In some embodiments, the first battery includes at least two of the solar cells of above, and adjacent two of the solar cells are electrically connected. Referring to FIG. 1 and FIG. 14, in order to improve aesthetic of the solar cell module, a decorative membrane 102 can be disposed between the first glass cover plate 101 and the first encapsulation layer 103 in the conventional art.

[00129] In the present disclosure, the solar cell of the solar cell module in the present embodiment can be a decorative solar cell. Therefore, a decorative membrane 102 is not required to be added between the first cover plate 201 and the first adhesive layer 203, but the metal pattern exhibiting different textures or decorative patterns can be formed by the plurality of metal electrodes. Therefore, the solar cell can be aesthetic, and cost and difficulty of encapsulation of the solar cell module can be largely decreased.

[00130] In some embodiments, a number of the solar cells in the first battery is 2n, wherein n is a natural number larger than or equal to one.

[00131] In the present embodiment, a connection between the solar cells can be described in in detail in conjunction with two solar cells. Specifically, suppose that the number of the solar cells is two. The two solar cells can be defined as a first solar cell 204 and a second solar cell 206, respectively, and can be electrically connected.

[00132] Referring to FIG. 14 to FIG. 15, the first solar cell 204 and the second solar cell 206 can be connected in series by the tin-coated welding stripes 205 between metal electrodes on corresponding solar cells.

[00133] That is, the adjacent solar cells can be electrically connected in series by a tin-coated welding stripe 205 between electrodes on the solar cell, resulting in the plurality of solar cells being connected in series. Then the plurality of solar cells can be adhered by the first adhesive layer 203, the second adhesive layer 207. Finally, the first cover plate 201 and the second cover plate 208 can be encapsulated to form the solar cell module.

[00134] In some embodiment, the tin-coated welding stripes 205 between the metal electrodes can be disposed in Z-shaped, resulting in metal electrodes on adjacent solar cells connected in series.

[00135] Referring to FIG. 16 and FIG. 17, a solar cell module in a second embodiment of the present disclosure can include a second cover plate 208, a second adhesive layer 207, a second battery 300, a first adhesive layer 203 and a first cover plate 201.The second adhesive layer 207, the second battery 300, the first adhesive layer 203 and the first cover plate 201 can be successively stacked on the second cover plate 208. The second battery 300 can include at least two slices of the solar cells of above, and adjacent two slices of the solar cells can be electrically connected.

[00136] Wherein, the adjacent two slices of the solar cells can be electrically connected as following: the adjacent two slices of the solar cells can be partly stacked to form an overlapping area, and metal electrodes of the adjacent two of the solar cells can be connected in series. In some embodiments, the metal electrodes disposed in the overlapping area can be provided with an electric conductive glue layer.

[00137] In some embodiments, a height of the metal electrodes extending from the solar cell sheet in the overlapping area is lower than a height of the metal electrodes extending from the solar cell sheet which is not in the overlapping area.

[00138] The metal electrode can be prepared by electroplating process, silk-screening process and the like. That is, by designing the distribution positions of the each of the metal electrodes on the solar cell sheet and shapes and/or sizes of the geometric structure of each of the metal electrodes during the process preparing the solar cell, the solar cell module encapsulated by the solar cell sheet is aesthetic.

[00139] The above embodiments are merely preferred embodiments of the present disclosure, and cannot be used to limit the scope of protection of the present disclosure. Any insubstantial changes and substitutions made by those skilled in the art on the basis of the present disclosure fall within the scope of protection claimed by the present disclosure.

[00140] The reference to any prior art in this specification is not, and should not be taken as, an acknowledgement or any form of suggestion that such prior art forms part of the common general knowledge.

[00141] It will be understood that the terms "comprise" and "include" and any of their derivatives (e.g. comprises, comprising, includes, including) as used in this specification, and the claims that follow, is to be taken to be inclusive of features to which the term refers, and is not meant to exclude the presence of any additional features unless otherwise stated or implied.

Claims

We claim: 1. A solar cell, characterized in that, the solar cell comprises a solar cell sheet and a plurality of metal electrodes, the plurality of metal electrodes are disposed on the solar cell sheet at intervals and define a metal pattern, the plurality of metal electrodes are geometric structures, and at least two of the plurality of metal electrodes are different, wherein the at least two of the plurality of metal electrodes are in different geometry shapes, and at least two of the plurality of metal electrodes are in different sizes, the at least two of the plurality of metal electrodes are in different heights, and a difference between the heights of the at least two of the plurality of metal electrodes is in a range of 60 nm to 150 nm, resulting in the metal pattern being shown as a decorative pattern when viewed at a

preset distance.
2. The solar cell of claim 1, wherein a first angle defined by a top surface of one of the at least two of the plurality of metal electrodes and a surface of the solar cell sheet is different from a second angle defined by a top surface of the other of the at least two of the plurality of metal electrodes and the surface of the solar cell sheet.
3. The solar cell of claim 1, wherein a material of the plurality of metal electrodes comprises at least one of silver, copper and aluminum.
4. The solar cell of claim 1, wherein a colored coating is disposed on a surface away from the solar cell sheet of at least one of the plurality of metal electrodes.
5. The solar cell of claim 1, wherein the solar cell is selected from a heterojunction cell, a stacked cell composed of a heterojunction cell and a thin film cell, a black silicon cell, a stacked cell composed of a black silicon cell and a thin film cell, a passivated emitter and rear cell, a stacked cell composed of a passivated emitter and rear cell and a thin film cell, a passivated contact cell, and a stacked cell composed of a passivated contact cell and a thin film cell.
6. A method for preparing the solar cell of any one of claims 1-5, characterized in that, the method comprises following steps: providing the solar cell sheet, and forming the plurality of metal electrodes on the solar cell sheet to obtain the solar cell, wherein the plurality of metal electrodes are disposed on the solar cell plate at intervals and define the metal pattern, the plurality of metal electrodes are in geometry shaped, and at least two of the plurality of metal electrodes are different.
7. The method of claim 6, wherein the step of forming the plurality of metal electrodes on the solar cell sheet is as follows: forming the plurality of metal electrodes on the solar cell sheet by a method of silk screen printing, wherein the plurality of metal electrodes are prepared by printing with different numbers of printing, resulting in adjacent two of the plurality of metal electrodes being in different height; or, forming the plurality of metal electrodes on the solar cell sheet by a method of electroplating, wherein a deposition velocity of different metal electrodes is controlled by controlling electric current density of electroplating, resulting in adjacent two of the plurality of metal electrodes being in different height; or, forming the plurality of metal electrodes on the solar cell sheet by a method of electroplating, wherein, the plurality of metal electrodes are prepared by electroplating with different numbers of electroplating, resulting in adjacent two of the plurality of metal electrodes being in different height.
8. The method of claim 6, wherein the step of forming the plurality of metal electrodes on the solar cell sheet comprises following steps: step Si1, preparing a plurality of grooves with different shapes on a laser transfer printing membrane; step S12, filling a metal electric conductive slurry in each of the plurality of grooves to form the plurality of metal electrodes and removing excessive metal electric conductive slurry from the surface of the laser transfer printing membrane; and step S13, transferring and printing the plurality of metal electrodes from the plurality of grooves to a surface of the solar cell sheet.
9. The method of claim 8, wherein the step S12 of filling the metal electric conductive slurry in each of the plurality of grooves to form the metal electrode and removing the excessive metal electric conductive slurry from the surface of the laser transfer printing membrane comprises: filling the metal electric conductive slurry in each groove of the plurality of grooves by printing, and after the filling, removing the excessive metal electric conductive slurry from the surface of the laser transfer printing membrane with a scraper, so as to form an electric conductor in each groove of the plurality of grooves; and, electroplating the metal electric conductive slurry on each of the electric conductors, resulting in each of the electric conductors extending out from the laser transferring printing membrane to obtain the plurality of metal electrodes.
10. The method of claim 6, wherein the step of forming the plurality of metal electrodes on the solar cell sheet comprises: step S21, preparing a plurality of grooves with different shapes on an electrode carrier membrane; step S22, filling a metal electric conductive material in each of the plurality of grooves to form the plurality of the metal electrodes; and step S23, pasting the plurality of metal electrodes on the surface of the solar cell sheet, and electrically connecting each of the plurality of metal electrodes with the solar cell sheet, thereby disposing the electrode carrier membrane on the solar cell sheet.
11. The method of claim 10, wherein the step S22 of filling the metal electric conductive material in each of the plurality of grooves to form the plurality of the metal electrodes comprises: filling the metal electric conductive slurry in each of the plurality of grooves by printing, and after the filling, removing the excessive metal electric conductive slurry from the surface of the laser transfer printing membrane with a scraper, so as to form the electric conductor in each of the plurality of grooves; electroplating the metal electric conductive slurry on each of the electric conductors, resulting in each of the electric conductors extending out from the laser transferring printing membrane to obtain the plurality of metal electrodes, or, the step S22 of filling the metal electric conductive material in each of the plurality of grooves to form the plurality of the metal electrodes comprises: depositing a metal electric conductive membrane in each of the plurality of grooves by sputtering, and after completing the depositing process, removing excess metal electric conductive membrane from the surface of the electrode carrier membrane by polishing; and depositing the metal electric conductive slurry on each of the electric conductive membranes by electroplating, resulting in the electric conductive membrane extending out from each of the electric conductive membranes to form the plurality of metal electrodes.
12. The method of claim 10, wherein the step S23 of pasting the plurality of metal electrodes on the surface of the solar cell sheet, electrically connecting each of the plurality of metal electrodes with the solar cell sheet, thereby disposing the electrode carrier membrane on the solar cell sheet comprises: bonding each of the plurality of metal electrodes to an electric conductive material on the solar cell sheet via a metal electric conductive adhesive, and electrically connecting each of the plurality of metal electrodes with the solar cell sheet, wherein the metal electric conductive adhesive is the metal electric conductive slurry or an electric conductive adhesive tape; and, the electric conductive material on the surface of the solar cell sheet is an electric conductive membrane or the metal electric conductive slurry.
13. The method of any one of claims 8, 11 and 12, wherein the metal electric conductive slurry comprises at least one of silver slurry, copper slurry and aluminum slurry.
14. A solar cell module, characterized in that, wherein the solar cell module comprises a second cover plate, a second adhesive layer, a first battery, a first adhesive layer and a first cover plate, wherein the second adhesive layer, the first battery, the first adhesive layer and the first cover plate are successively stacked on the second cover plate, the first battery comprises at least two of the solar cells of any one of claims 1-5, and adjacent two of the solar cells are electrically connected.
15. The solar cell module of claim 14, wherein the adjacent two of the solar cells are electrically connected in series by a tin-coated welding stripe.
16. The solar cell module of claim 15, wherein the tin-coated welding stripes are disposed in Z-shaped.
17. A solar cell module, wherein the solar cell module comprises a second cover plate, a second adhesive layer, a second battery, a first adhesive layer and a first cover plate, wherein the second adhesive layer, the second battery, the first adhesive layer and the first cover plate are successively stacked on the second cover plate, the second battery comprises at least two slices of the solar cells of any one of claims 1-5, and adjacent two slices of the solar cells are electrically connected.
18. The solar cell module of claim 17, wherein the adjacent two of the solar cells are electrically connected as following: the adjacent two slices of the solar cells are partly stacked to form an overlapping area, and metal electrodes of the adjacent two of the solar cells are connected in series.
19. The solar cell module of claim 18, wherein an electric conductive glue layer is disposed on the surface of the metal electrodes in the overlapping area.
20. The solar cell module of claim 18, wherein a height of the metal electrodes extending from the solar cell sheet in the overlapping area is lower than a height of the metal electrodes extending from the solar cell sheet which is not in the overlapping area.