CN114990659B - Horizontal electroplating device, electroplating method and application of crystalline silicon photovoltaic cell - Google Patents
Horizontal electroplating device, electroplating method and application of crystalline silicon photovoltaic cell Download PDFInfo
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- CN114990659B CN114990659B CN202210644812.4A CN202210644812A CN114990659B CN 114990659 B CN114990659 B CN 114990659B CN 202210644812 A CN202210644812 A CN 202210644812A CN 114990659 B CN114990659 B CN 114990659B
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- 238000009713 electroplating Methods 0.000 title claims abstract description 184
- 238000000034 method Methods 0.000 title claims abstract description 36
- 229910021419 crystalline silicon Inorganic materials 0.000 title claims abstract description 34
- 239000007788 liquid Substances 0.000 claims abstract description 153
- 210000001503 joint Anatomy 0.000 claims abstract description 3
- 238000007747 plating Methods 0.000 claims description 51
- 238000003860 storage Methods 0.000 claims description 12
- 229910021645 metal ion Inorganic materials 0.000 claims description 7
- 230000001105 regulatory effect Effects 0.000 claims description 7
- 238000007667 floating Methods 0.000 claims description 6
- 238000005096 rolling process Methods 0.000 claims description 5
- 238000011084 recovery Methods 0.000 claims description 3
- 238000009792 diffusion process Methods 0.000 claims 1
- 238000004519 manufacturing process Methods 0.000 abstract description 10
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 15
- 229910052709 silver Inorganic materials 0.000 description 15
- 239000004332 silver Substances 0.000 description 15
- 230000000694 effects Effects 0.000 description 9
- 229910052751 metal Inorganic materials 0.000 description 9
- 239000002184 metal Substances 0.000 description 9
- 230000005684 electric field Effects 0.000 description 7
- 239000000463 material Substances 0.000 description 6
- 238000007650 screen-printing Methods 0.000 description 6
- 238000010521 absorption reaction Methods 0.000 description 4
- 230000000903 blocking effect Effects 0.000 description 4
- 239000004065 semiconductor Substances 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 3
- 229910052802 copper Inorganic materials 0.000 description 3
- 239000010949 copper Substances 0.000 description 3
- 230000005611 electricity Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 2
- 230000002745 absorbent Effects 0.000 description 2
- 239000002250 absorbent Substances 0.000 description 2
- 239000011358 absorbing material Substances 0.000 description 2
- 229910052710 silicon Inorganic materials 0.000 description 2
- 239000010703 silicon Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 238000001465 metallisation Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000004584 weight gain Effects 0.000 description 1
- 235000019786 weight gain Nutrition 0.000 description 1
Classifications
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D7/00—Electroplating characterised by the article coated
- C25D7/12—Semiconductors
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D17/00—Constructional parts, or assemblies thereof, of cells for electrolytic coating
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D17/00—Constructional parts, or assemblies thereof, of cells for electrolytic coating
- C25D17/02—Tanks; Installations therefor
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D17/00—Constructional parts, or assemblies thereof, of cells for electrolytic coating
- C25D17/06—Suspending or supporting devices for articles to be coated
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D5/00—Electroplating characterised by the process; Pretreatment or after-treatment of workpieces
- C25D5/02—Electroplating of selected surface areas
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Photovoltaic Devices (AREA)
- Electroplating Methods And Accessories (AREA)
Abstract
The invention provides a horizontal electroplating device, an electroplating method and application of a crystalline silicon photovoltaic cell, wherein the horizontal electroplating device comprises a conveying module and an electroplating module which are in butt joint, the electroplating module comprises an electroplating tank filled with electroplating liquid, a plurality of rotary anodes are arranged in the electroplating tank side by side, each rotary anode comprises an anode conveying roller and a flexible liquid absorbing layer sleeved on the periphery of the anode conveying roller, and the flexible liquid absorbing layer is completely immersed in the electroplating liquid and is tangential to the liquid level of the electroplating liquid; and a plurality of cathode connecting pieces are arranged above the anode conveying roller, and the anode conveying roller and the cathode connecting pieces are respectively and electrically connected with the power supply device. The invention sucks the electroplating liquid by using the flexible liquid absorbing layer, can electroplate the battery piece in the electroplating process, and has the characteristics of mass production, high stability, high efficiency and the like.
Description
Technical Field
The invention belongs to the technical field of photovoltaic cells, and relates to a horizontal electroplating device, an electroplating method and application of a crystalline silicon photovoltaic cell.
Background
At present, in the photovoltaic field, grid lines on the surface of a crystalline silicon battery piece are all made of silver paste through screen printing, the size of the grid lines cannot be too thin due to the principle of screen printing, the grid line resistance cannot be too low due to the compactness limitation of the screen printing, and the cost of the silver paste grid lines is high.
The existing electroplating schemes in the market are laboratory small batch test electroplating technologies, most of the electroplating schemes are battery pieces clamped through a carrier, conductive golden fingers are arranged on the carrier to be in contact with battery piece grid lines and form loops with a power supply and an anode, and finally, the grid line metallization is realized through conventional hanging plating or vertical electroplating, so that the capacity of the hanging plating or vertical electroplating technology for the battery pieces is extremely low, the stability is extremely poor, the electroplating technology can only be applied to laboratory small batch test, and industrial mass production cannot be realized.
CN102296344a discloses a solar cell electroplating device for improving electroplating uniformity, which comprises an electroplating bath, an electroplating solution, a cell and a silver anode, wherein the electroplating bath is provided with the electroplating solution, the cell and the silver anode are arranged in the electroplating bath and are immersed in the electroplating solution, the silver anode is arranged at a position below the cell and corresponds to the cell, the shape of the silver anode is an arc with an upward convex middle part, namely, the middle of the silver anode is closest to the vertical distance of the cell, and the farther to the two ends of the silver anode, the farther the vertical distance between the silver anode and the cell is. The invention changes the shape of the silver anode to make the electric field of each battery piece more uniform, thereby obtaining more uniform electroplating weight gain, reducing the variance of the process, improving the quality of the product, and only changing the shape of the silver anode, thus being simpler to realize, not increasing the cost and not changing the process.
CN112575351a is a solar cell horizontal electroplating device, which comprises an electroplating assembly and a guiding assembly which are arranged on a shell, wherein the electroplating assembly comprises a plurality of anode groups which are parallel to each other, a liquid medicine conveying group is arranged at the anode groups, water blocking roller groups are arranged at two sides of each anode group, a conductive cathode roller group is arranged between every two adjacent water blocking roller groups, a group of electroplating units is formed by each adjacent water blocking roller group, anode group, water blocking roller group and conductive cathode roller group, and a cell can at least cover one electroplating unit; the guide components are arranged at two ends of the electroplating component. The patent can reduce the production cost of the solar cell, solve the problem that the existing silver paste cannot be replaced, and enable the solar cell to be more civilian.
Therefore, how to improve the electroplating stability of the crystalline silicon battery piece and reduce the preparation cost of the crystalline silicon battery becomes a technical problem which needs to be solved urgently at present.
Disclosure of Invention
Aiming at the defects existing in the prior art, the invention aims to provide a horizontal electroplating device, an electroplating method and application of a crystalline silicon photovoltaic cell, which utilize a flexible liquid absorbing layer to absorb electroplating liquid, and can electroplate a cell in the electroplating process, and the crystalline silicon photovoltaic cell has the characteristics of mass production, high stability, high efficiency and the like.
To achieve the purpose, the invention adopts the following technical scheme:
In a first aspect, the invention provides a horizontal electroplating device of a crystalline silicon photovoltaic cell, the horizontal electroplating device comprises a conveying module and an electroplating module which are in butt joint, the electroplating module comprises an electroplating tank filled with electroplating liquid, a plurality of rotary anodes are arranged in the electroplating tank side by side, each rotary anode comprises an anode conveying roller and a flexible liquid absorbing layer sleeved on the periphery of the anode conveying roller, and the flexible liquid absorbing layer is completely immersed in the electroplating liquid and is tangential to the liquid level of the electroplating liquid;
The positive pole conveying roller top is provided with a plurality of negative pole connecting pieces, positive pole conveying roller and negative pole connecting piece electric connection power supply unit respectively, the battery piece by transport module carries to between positive pole conveying roller and the negative pole connecting piece, the both sides surface of electrode piece respectively with flexible liquid absorbing layer and negative pole connecting piece contact, pass through power supply unit and switch on the electrode piece, along with the roll of positive pole conveying roller, the plating solution that flexible liquid absorbing layer absorbed contacts the electrode piece lower surface and diffuses under surface tension effect and electroplate.
According to the invention, the anode conveying roller sleeved with the flexible liquid absorbing layer is utilized, in the electroplating process, the battery piece is conveyed to the anode conveying roller and the cathode connecting piece, and along with the rolling of the anode conveying roller, the electroplating liquid absorbed by the flexible liquid absorbing layer contacts the lower surface of the electrode piece and diffuses for electroplating under the action of surface tension, so that the contact between the battery piece and the electroplating liquid is ensured, stable batch electroplating is realized, and the quantitative electroplating of the crystalline silicon battery piece is solved. Specifically, the horizontal electroplating device provided by the invention has the following advantages:
1. conventional metal (e.g., copper) plating can be used instead of silver paste screen printing to greatly reduce cost;
2. the width of the grid line is greatly reduced, the aspect ratio is optimized, so that a larger light receiving area is obtained, and the battery efficiency can be improved;
3. the grid line structure is more compact by electroplating at a low temperature, the conductivity is better, and the battery efficiency can be improved;
4. The large-batch industrial mass production can be realized without a carrier, a conveying structure of a production line and an electroplating structure, and the stability is high.
As a preferable technical scheme of the invention, the horizontal electroplating device further comprises an overflow tank, and the electroplating tank is arranged in the overflow tank.
The overflow tank is externally connected with the plating solution storage tank, the outlet end of the plating solution storage tank is connected with the plating tank, the plating solution stored in the plating solution storage tank is input into the plating tank, and the plating solution overflowed from the plating tank enters the overflow tank and flows into the plating solution storage tank for recovery.
As a preferable technical scheme of the invention, a plurality of wires are led out from the positive electrode of the power supply device and are respectively and electrically connected with an anode conveying roller.
The anode conveying rollers are arranged at intervals along the movement direction of the battery piece.
As a preferable technical scheme of the invention, the cathode connecting piece is a cathode conductive brush, and the cathode of the power supply device is led out with a plurality of wires which are respectively and electrically connected with one cathode conductive brush.
The cathode connecting pieces are arranged at intervals along the movement direction of the battery piece.
The cathode conductive brush is positioned on the upper surface of the battery piece and is contacted with the grid line on the upper surface of the battery piece, and the upper surface and the lower surface of the battery piece are conducted through current by utilizing the semiconductor conductive characteristic of the silicon wafer to carry out electroplating.
As a preferable technical scheme of the invention, the conveying module comprises a plurality of conveying rollers which are arranged side by side at intervals along the moving direction of the battery piece.
The conveying rollers defined by the invention are driven by the conveying mechanism, so that the horizontal conveying of the battery pieces is realized. The type and structure of the conveying mechanism are not particularly limited and are not particularly limited, and chain drive, gear drive, motor drive and the like commonly used in the art can be used in the invention.
As a preferable technical scheme of the invention, the flexible liquid absorbing layer is a sponge layer.
It should be noted that the number of layers of the flexible liquid absorbing layer is not particularly required or limited, and a person skilled in the art can reasonably set the flexible liquid absorbing layer according to the liquid holding requirement, for example, the flexible liquid absorbing layer can be prepared from a plurality of layers of flexible liquid absorbing materials with different materials, so that the liquid absorbing effect on the electroplating liquid is ensured.
In addition, the material of the flexible liquid absorbing layer is not particularly required or limited, and the flexible liquid absorbing layer can be reasonably arranged according to the use condition by a person skilled in the art, has certain liquid absorbing capacity and certain flexibility, can be contacted with the inhaled electroplating liquid when the battery piece is pressed on the flexible liquid absorbing layer, and can be diffused to the lower surface of the battery piece under the action of surface tension.
According to the invention, the sponge is preferably used as the flexible liquid absorbing layer, the sponge layer is made of a spongy high-flexibility material, and when the battery piece is conveyed on the surface of the flexible liquid absorbing layer, the high flexibility of the sponge is utilized to be highly attached to the grid line of the battery piece; in addition, by utilizing the porous structure of the sponge, the liquid absorption amount is large, and the absorbed electroplating liquid can be rapidly diffused by utilizing the surface tension of the absorbed electroplating liquid and the lower surface of the battery piece after the absorbed electroplating liquid is contacted, so that the battery piece forms a floating effect in the conveying process; meanwhile, the porous structure of the sponge is utilized to realize the flow and replacement of the electroplating liquid sucked in the sponge, and metal ions can be continuously conveyed and uniformly deposited to the metal grid line on the lower surface of the battery piece in the electroplating process.
As a preferable embodiment of the present invention, the anode transport roller is an insoluble anode transport roller.
The rotary anode provided by the invention consists of an anode conveying roller and a flexible liquid absorbing layer, wherein the tail end of the anode conveying roller is electrically connected with the positive electrode of a power supply device by adopting a rotary conductive joint. The rotary anode is driven by a motor to realize horizontal conveying of the battery piece, and in the conveying process, the flexible liquid absorbing layer absorbs the electroplating liquid and contacts with the battery piece.
The anode conveying roller is used as a part of a rotary anode and is used for conducting electricity, when the back of the battery piece contacts with the cathode conducting brush and the power supply device is started, an electric field is uniformly established between the anode conveying roller and the back of the battery piece, and the flexible liquid absorbing layer deposits metal ions on the metal grid on the back of the battery piece, so that an electroplating process is realized.
As a preferable technical scheme of the invention, the horizontal electroplating device comprises a controller and a liquid level regulator which are electrically connected, wherein the liquid level regulator is arranged in the electroplating tank and is used for regulating the liquid level of the electroplating liquid.
The controller is also electrically connected with the conveying module, and the controller feeds back and controls the conveying speed of the battery piece.
In the invention, the liquid level regulator is used for regulating the liquid level of the electroplating liquid in the electroplating tank, and in the actual electroplating process, the height of the back surface of the battery piece from the ground is slightly higher than that of the electroplating liquid, namely a certain gap exists between the back surface of the battery piece and the liquid level of the electroplating liquid, so that the electroplating liquid is prevented from turning over to the upper surface of the battery piece, and meanwhile, the cathode conductive brush is prevented from contacting the electroplating liquid.
It should be noted that the structure and type of the liquid level regulator are not particularly limited and are not particularly limited, and those skilled in the art can reasonably set the liquid level regulator according to the design requirements, for example, the liquid level regulator can be a liquid level regulating plate, or a combination of a liquid level meter and a liquid discharge valve.
In a second aspect, the present invention provides a method for electroplating a crystalline silicon photovoltaic cell, where the electroplating method uses the horizontal electroplating device for crystalline silicon photovoltaic cells according to the first aspect, and the electroplating method includes:
The battery piece is conveyed between the anode conveying roller and the cathode connecting piece by the conveying module, the two side surfaces of the electrode piece are respectively contacted with the flexible liquid absorbing layer and the cathode connecting piece, and the electrode piece is electrified by the power supply device; and along with the rolling of the anode conveying roller, the electroplating liquid sucked by the flexible liquid suction layer contacts the lower surface of the electrode plate and diffuses under the action of surface tension to perform electroplating.
The invention provides a specific use method of a horizontal electroplating device, which comprises the following steps:
(1) The conveying roller conveys the battery piece to the electroplating module through the driving motor;
(2) After the battery piece enters the plating bath, starting the power supply device, using the cathode conductive brush to contact the negative electrode of the power supply device with the grid line on the upper surface of the battery piece, and using the characteristics of the semiconductor to realize the electrification of the grid line on the lower surface of the battery piece;
(3) After the electroplating liquid on the surface of the rotary anode contacts the lower surface of the battery piece, the electroplating liquid is rapidly dispersed and uniformly distributed on the back surface of the battery piece under the action of surface tension, so that the battery piece generates a floating effect on the surface of the electroplating liquid;
(4) The rotary anode rotates synchronously, an electric field required by electroplating is formed in the flexible liquid absorption layer between the anode conveying roller and the lower surface of the battery piece while the battery piece is conveyed, and metal ions uniformly deposit metal required to be electroplated to the position of a grid line contacted with the flexible liquid absorption layer under the action of the electric field, so that electroplating is realized.
In a third aspect, the present invention provides a use of the horizontal electroplating device of the crystalline silicon photovoltaic cell of the first aspect, where the horizontal electroplating device of the crystalline silicon photovoltaic cell is used for grid line electroplating of a crystalline silicon cell.
Compared with the prior art, the invention has the beneficial effects that:
According to the invention, the anode conveying roller sleeved with the flexible liquid absorbing layer is utilized, in the electroplating process, the battery piece is conveyed on the flexible liquid absorbing layer absorbing the electroplating liquid, the surface tension between the battery piece and the electroplating liquid is utilized, the electroplating liquid is rapidly dispersed and uniformly distributed on the lower surface of the battery piece, the contact between the battery piece and the electroplating liquid is ensured, the effect that the battery piece is in floating contact on the surface of the electroplating liquid is achieved, stable batch electroplating is realized, and the quantitative electroplating of the crystalline silicon battery piece is solved, and the method has the following advantages:
1. Conventional metal (e.g., copper) plating can be used instead of silver paste screen printing to significantly reduce costs.
2. The width of the grid line is greatly reduced, the aspect ratio is optimized, a larger light receiving area is obtained, and the battery efficiency can be improved.
3. The electroplating under the low-temperature process can obtain a denser grid line structure, the conductivity is better, and the battery efficiency can be improved.
4. The large-batch industrial mass production can be realized without a carrier, a conveying structure of a production line and an electroplating structure, and the stability is high.
Drawings
Fig. 1 is a schematic structural diagram of a horizontal electroplating apparatus for a crystalline silicon photovoltaic cell according to an embodiment of the present invention;
Fig. 2 is a schematic view showing a contact between a cell and a plating solution in a horizontal plating apparatus for a crystalline silicon photovoltaic cell according to an embodiment of the present invention.
Wherein, 1-cell slice; 2-conveying rollers; 3-electroplating bath; 4-an overflow trough; 5-anode transport rollers; 6-flexible liquid absorbent layer; 7-cathode conductive brushes; 8-a power supply device; 9-a plating solution reservoir.
Detailed Description
It is to be understood that in the description of the present invention, the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus are not to be construed as limiting the present invention.
It should be noted that, in the description of the present invention, unless explicitly specified and limited otherwise, the terms "disposed," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art in a specific case.
The technical scheme of the invention is further described by the following specific embodiments.
In a specific embodiment, the invention provides a horizontal electroplating device of a crystalline silicon photovoltaic cell, which is shown in fig. 1, and comprises a butt-joint conveying module and an electroplating module, wherein the electroplating module comprises an electroplating tank 3 filled with electroplating liquid, a plurality of rotary anodes are arranged in the electroplating tank 3 side by side, each rotary anode comprises an anode conveying roller 5 and a flexible liquid absorbing layer 6 sleeved on the periphery of the anode conveying roller 5, and the flexible liquid absorbing layer 6 is completely immersed in the electroplating liquid and is tangential to the liquid level of the electroplating liquid;
The positive pole is carried roller 5 top and is provided with a plurality of negative pole connecting pieces, positive pole is carried roller 5 and negative pole connecting piece and is connected power supply unit 8 respectively, battery piece 1 by transport module carries to between positive pole is carried roller 5 and the negative pole connecting piece, and the both sides surface of electrode piece contacts with flexible liquid absorbing layer 6 and negative pole connecting piece respectively, and is circular telegram to the electrode piece through power supply unit 8, along with the roll of positive pole is carried roller 5, the plating solution that flexible liquid absorbing layer 6 was absorbed contacts the electrode piece lower surface and diffuses under surface tension effect and electroplate (as shown in fig. 2).
According to the invention, the anode conveying roller 5 sleeved with the flexible liquid absorbing layer 6 is utilized, in the electroplating process, the battery piece 1 is conveyed to the anode conveying roller 5 and the cathode connecting piece, and along with the rolling of the anode conveying roller 5, the electroplating liquid absorbed by the flexible liquid absorbing layer 6 contacts the lower surface of the electrode piece and diffuses for electroplating under the action of surface tension, so that the contact between the battery piece 1 and the electroplating liquid is ensured, stable batch electroplating is realized, and quantitative electroplating of the crystalline silicon battery piece 1 is solved. Specifically, the horizontal electroplating device provided by the invention has the following advantages:
1. conventional metal (e.g., copper) plating can be used instead of silver paste screen printing to greatly reduce cost;
2. the width of the grid line is greatly reduced, the aspect ratio is optimized, so that a larger light receiving area is obtained, and the battery efficiency can be improved;
3. the grid line structure is more compact by electroplating at a low temperature, the conductivity is better, and the battery efficiency can be improved;
4. The large-batch industrial mass production can be realized without a carrier, a conveying structure of a production line and an electroplating structure, and the stability is high.
Further, the horizontal electroplating device further comprises an overflow tank 4, and the electroplating tank 3 is arranged in the overflow tank 4.
The overflow tank 4 is externally connected with the plating solution storage tank 9, the outlet end of the plating solution storage tank 9 is connected with the plating tank 3, the plating solution stored in the plating solution storage tank 9 is input into the plating tank 3, and the plating solution overflowed from the plating tank 3 enters the overflow tank 4 and flows into the plating solution storage tank 9 for recovery.
Further, the positive electrode of the power supply device 8 is led out of a plurality of wires and is electrically connected with one anode conveying roller 5 respectively.
The anode transport rollers 5 are disposed at intervals in the moving direction of the battery sheet 1.
Further, the cathode connecting piece is a cathode conductive brush 7, and a plurality of wires are led out from the cathode of the power supply device 8 and are respectively and electrically connected with one cathode conductive brush 7.
The cathode connectors are arranged at intervals along the movement direction of the battery piece 1.
The cathode conductive brush 7 is positioned on the upper surface of the battery piece 1, contacts with the grid line on the upper surface of the battery piece 1, and conducts electricity on the upper surface and the lower surface of the battery piece 1 through current by utilizing the semiconductor conductive characteristic of the silicon chip to carry out electroplating.
Further, the conveying module comprises a plurality of conveying rollers 2 which are arranged at intervals side by side along the moving direction of the battery piece 1.
The conveying roller 2 defined by the present invention is driven by a conveying mechanism, so that the battery piece 1 is horizontally conveyed. The type and structure of the conveying mechanism are not particularly limited and are not particularly limited, and chain drive, gear drive, motor drive and the like commonly used in the art can be used in the invention.
Further, the flexible liquid absorbent layer 6 is a sponge layer.
It should be noted that the number of layers of the flexible liquid absorbing layer 6 is not specifically required or specially limited, and those skilled in the art can reasonably set the number according to the liquid holding requirement, for example, the flexible liquid absorbing layer 6 can be prepared from a plurality of layers of flexible liquid absorbing materials with different materials, so as to ensure the liquid absorbing effect on the electroplating liquid.
In addition, the material of the flexible liquid absorbing layer 6 is not particularly required or limited, and a person skilled in the art can reasonably set the flexible liquid absorbing layer 6 according to the use condition, and the flexible liquid absorbing layer 6 has certain liquid absorbing capability and certain flexibility, can be contacted with the inhaled electroplating liquid when the battery piece 1 is pressed on the flexible liquid absorbing layer 6, and can be diffused to the lower surface of the battery piece 1 under the action of surface tension.
According to the invention, the sponge is preferably used as the flexible liquid absorbing layer 6, the sponge layer is made of a sponge-like high-flexibility material, and when the battery piece 1 is conveyed on the surface of the flexible liquid absorbing layer 6, the high flexibility of the sponge is utilized to be highly attached to the grid line of the battery piece 1; in addition, by utilizing the porous structure of the sponge, the liquid absorption amount is large, and the absorbed electroplating liquid can be rapidly diffused by utilizing the surface tension of the absorbed electroplating liquid and the lower surface of the battery piece 1 after the absorbed electroplating liquid is contacted, so that the battery piece 1 forms a floating effect in the conveying process; meanwhile, the porous structure of the sponge is utilized to realize the flow and replacement of the electroplating liquid sucked inside, and metal ions can be continuously conveyed and uniformly deposited to the metal grid line on the lower surface of the battery piece 1 in the electroplating process.
Further, the anode transport roller 5 is an insoluble anode transport roller 5.
The rotary anode provided by the invention consists of an anode conveying roller 5 and a flexible liquid absorbing layer 6, wherein the tail end of the anode conveying roller 5 is electrically connected with the positive electrode of a power supply device 8 by adopting a rotary conductive joint. The rotary anode is driven by a motor to realize horizontal conveying of the battery piece 1, and in the conveying process, the flexible liquid absorbing layer 6 absorbs electroplating liquid and contacts with the battery piece 1.
The anode conveying roller 5 is used as a part of a rotary anode and is used for conducting electricity, when the back surface of the battery piece 1 contacts with the cathode conducting brush 7 and the power supply device 8 is started, an electric field is uniformly established between the anode conveying roller 5 and the back surface of the battery piece 1, and the flexible liquid absorbing layer 6 deposits metal ions on the metal grid on the back surface of the battery piece 1, so that an electroplating process is realized.
Further, the horizontal electroplating device comprises a controller and a liquid level regulator which are electrically connected, the liquid level regulator is arranged in the electroplating bath 3, and the liquid level regulator is used for regulating the liquid level of the electroplating liquid.
The controller is also electrically connected with the conveying module, and the controller feeds back and controls the conveying speed of the battery piece 1.
In the invention, the liquid level regulator is used for regulating the liquid level of the plating solution in the plating tank 3, and in the actual plating process, the ground clearance of the back surface of the battery piece 1 is slightly higher than that of the plating solution, namely, a certain gap exists between the back surface of the battery piece 1 and the liquid level of the plating solution, so that the plating solution is prevented from turning over to the upper surface of the battery piece 1, and meanwhile, the cathode conductive brush 7 is prevented from contacting the plating solution.
It should be noted that the structure and type of the liquid level regulator are not particularly limited and are not particularly limited, and those skilled in the art can reasonably set the liquid level regulator according to the design requirements, for example, the liquid level regulator can be a liquid level regulating plate, or a combination of a liquid level meter and a liquid discharge valve.
In another embodiment, the present invention provides a method for electroplating a crystalline silicon photovoltaic cell 1, where the electroplating method uses the horizontal electroplating device for crystalline silicon photovoltaic cells according to the first aspect, and the electroplating method includes:
The battery piece 1 is conveyed between the anode conveying roller 5 and the cathode connecting piece by the conveying module, the two side surfaces of the electrode piece are respectively contacted with the flexible liquid absorbing layer 6 and the cathode connecting piece, and the electrode piece is electrified by the power supply device 8; as the anode conveying roller 5 rolls, the plating liquid sucked by the flexible liquid sucking layer 6 contacts the lower surface of the electrode plate and diffuses under the action of surface tension to perform plating.
The invention provides a specific use method of a horizontal electroplating device, which comprises the following steps:
(1) The conveying roller 2 conveys the battery piece 1 to the electroplating module through a driving motor;
(2) After the battery piece 1 enters the electroplating bath 3, starting the power supply device 8, using the cathode conductive brush 7 to contact the negative electrode of the power supply device 8 with the grid line on the upper surface of the battery piece 1, and using the characteristics of a semiconductor to realize the electrification of the grid line on the lower surface of the battery piece 1;
(3) After the electroplating solution on the surface of the rotary anode contacts the lower surface of the battery piece 1, the electroplating solution is rapidly dispersed and uniformly distributed on the back surface of the battery piece 1 under the action of surface tension, so that the battery piece 1 generates a floating effect on the surface of the electroplating solution;
(4) The rotary anode rotates synchronously, an electric field required by electroplating is formed in the flexible liquid absorbing layer 6 between the anode conveying roller 5 and the lower surface of the battery piece 1 while the battery piece 1 is conveyed, and metal ions uniformly deposit metal required to be electroplated to the position of a grid line contacted with the flexible liquid absorbing layer 6 under the action of the electric field, so that electroplating is realized.
The applicant declares that the above is only a specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and it should be apparent to those skilled in the art that any changes or substitutions that are easily conceivable within the technical scope of the present invention disclosed by the present invention fall within the scope of the present invention and the disclosure.
Claims (8)
1. The horizontal electroplating device for the grid line electroplated crystalline silicon photovoltaic cell is characterized by comprising a conveying module and an electroplating module which are in butt joint, wherein the electroplating module comprises an electroplating tank filled with electroplating liquid, a plurality of rotary anodes are arranged in the electroplating tank side by side, each rotary anode comprises an anode conveying roller and a flexible liquid absorbing layer sleeved on the periphery of the anode conveying roller, the flexible liquid absorbing layer is completely immersed in the electroplating liquid and is tangential to the liquid level of the electroplating liquid, and the flexible liquid absorbing layer is a sponge layer;
A plurality of cathode connecting pieces are arranged above the anode conveying roller, the anode conveying roller and the cathode connecting pieces are respectively and electrically connected with a power supply device, a battery piece is conveyed between the anode conveying roller and the cathode connecting pieces by the conveying module, the surfaces of two sides of the electrode piece are respectively contacted with the flexible liquid absorbing layer and the cathode connecting pieces, the electrode piece is electrified by the power supply device, along with the rolling of the anode conveying roller, the battery piece is conveyed on the flexible liquid absorbing layer absorbing electroplating liquid, the cathode connecting pieces are cathode conductive brushes, and the cathode of the power supply device is led out of a plurality of wires and is respectively and electrically connected with one cathode conductive brush; the cathode connecting pieces are arranged at intervals along the movement direction of the battery piece;
the cathode conductive brush is used for contacting a negative electrode of the power supply device with a grid line on the upper surface of the battery piece to realize the conduction of the grid line on the upper surface of the battery piece, the sponge layer is highly attached to the grid line of the battery piece, and the electroplating solution absorbed by the sponge layer is contacted with the lower surface of the electrode piece to realize the rapid diffusion of the electroplating solution by utilizing the surface tension of the sponge layer and the electrode piece, so that the electrode piece forms a floating state in the conveying process, and meanwhile, the flowing and the replacement of the electroplating solution absorbed by the sponge layer are realized based on the porous structure of the sponge layer so as to continuously convey and uniformly deposit metal ions to the grid line on the lower surface of the electrode piece.
2. The horizontal electroplating device of a crystalline silicon photovoltaic cell according to claim 1, further comprising an overflow trough, the electroplating trough being disposed within the overflow trough;
the overflow tank is externally connected with the plating solution storage tank, the outlet end of the plating solution storage tank is connected with the plating tank, the plating solution stored in the plating solution storage tank is input into the plating tank, and the plating solution overflowed from the plating tank enters the overflow tank and flows into the plating solution storage tank for recovery.
3. The horizontal electroplating device of the crystalline silicon photovoltaic cell according to claim 1, wherein a positive electrode of the power supply device is led out of a plurality of wires, and the wires are respectively and electrically connected with an anode conveying roller;
The anode conveying rollers are arranged at intervals along the movement direction of the battery piece.
4. The horizontal electroplating device of a crystalline silicon photovoltaic cell according to claim 1, wherein the conveying module comprises a plurality of conveying rollers arranged at intervals side by side along the moving direction of the cell.
5. The horizontal electroplating device of a crystalline silicon photovoltaic cell of claim 1, wherein the anode transport roller is an insoluble anode transport roller.
6. The horizontal electroplating device of the crystalline silicon photovoltaic cell according to claim 1, wherein the horizontal electroplating device comprises a controller and a liquid level regulator which are electrically connected, wherein the liquid level regulator is arranged in the electroplating bath and is used for regulating the liquid level of the electroplating liquid;
the controller is also electrically connected with the conveying module, and the controller feeds back and controls the conveying speed of the battery piece.
7. A method for electroplating a crystalline silicon photovoltaic cell sheet, characterized in that the electroplating method adopts the horizontal electroplating device for the crystalline silicon photovoltaic cell for grid line electroplating according to any one of claims 1 to 6, and the electroplating method comprises the following steps:
The battery piece is conveyed between the anode conveying roller and the cathode connecting piece by the conveying module, the two side surfaces of the electrode piece are respectively contacted with the flexible liquid absorbing layer and the cathode connecting piece, and the electrode piece is electrified by the power supply device; and along with the rolling of the anode conveying roller, the electroplating liquid sucked by the flexible liquid suction layer contacts the lower surface of the electrode plate and diffuses under the action of surface tension to perform electroplating.
8. Use of a horizontal plating device for a crystalline silicon photovoltaic cell for grid line plating according to any of claims 1-6, characterized in that the horizontal plating device for a crystalline silicon photovoltaic cell is used for grid line plating of crystalline silicon cell sheets.
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