CN210560844U - Electroplating device for crystalline silicon solar cell electrode - Google Patents

Electroplating device for crystalline silicon solar cell electrode Download PDF

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Publication number
CN210560844U
CN210560844U CN201920952561.XU CN201920952561U CN210560844U CN 210560844 U CN210560844 U CN 210560844U CN 201920952561 U CN201920952561 U CN 201920952561U CN 210560844 U CN210560844 U CN 210560844U
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China
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electroplating
solar cell
silicon solar
crystalline silicon
battery piece
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张洪超
童洪波
李华
刘继宇
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Taizhou Longi Solar Technology Co Ltd
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Taizhou Lerri Solar Technology Co Ltd
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/50—Photovoltaic [PV] energy
    • Y02E10/547—Monocrystalline silicon PV cells

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Abstract

The application discloses an electroplating device for a crystalline silicon solar cell electrode, which comprises an electroplating bath; the flower basket can be taken out set up in the plating bath, the flower basket has the battery piece of a plurality of vertical settings and holds the groove, metal electrode is located the plating bath, metal electrode and battery piece hold parallel and the one-to-one in groove, the anodal of electroplating power is connected to the metal electrode electricity, the top of plating bath is provided with the bracing piece, be connected with a plurality of fixed units on the bracing piece, each fixed unit is including stretching into the holder in the plating bath, battery piece holds groove and holder one-to-one, the holder has the opening and holds the double-layered groove in groove towards the battery piece, it is used for waiting to electroplate the battery piece and support the elasticity conductive element who presses at double-layered inslot and electric connection wait to electroplate the battery piece to press in the double-layered inslot to press in. When electroplating, a plurality of fixing units are used for correspondingly connecting a plurality of battery pieces to be electroplated one by one, so that the floating movement of the electroplating pieces during electroplating is prevented, the electroplating quality is ensured, and the production efficiency is improved.

Description

Electroplating device for crystalline silicon solar cell electrode
Technical Field
The utility model relates to a solar cell preparation technical field, concretely relates to electroplating device of crystalline silicon solar cell electrode.
Background
The crystalline silicon solar cell is the solar cell with the highest market share at present due to high energy conversion efficiency. How to improve the photoelectric conversion efficiency of the crystalline silicon solar cell and reduce the production cost thereof is the biggest problem in the industry. At present, in large-scale silicon solar cell manufacturing, a screen printing mode is usually adopted to realize a metallization process of the silicon solar cell, but the screen printing precision is limited, the printed electrode has fluctuant appearance, the electrode is widened greatly after printing and sintering, the height-width ratio of a formed grid is low, the effective light receiving area of the light receiving surface of the silicon solar cell is reduced, and in addition, the resistivity of silver paste sintered by the screen printing is 5 multiplied by 10-6～8×10-6Omega cm, much higher than the resistivity of monomeric silver.
The electroplated metal electrodes have a lower resistivity, typical of electroplated copper at 2X 10-6～3×10-6Omega cm. The grid electrode of the silicon solar cell can be selectively formed through electroplating or light-induced electroplating, so that the shading of the grid electrode is effectively reduced, and the resistance of the grid electrode and the series resistance of the silicon solar cell are effectively reduced. At present, the traditional screen printing technology is replaced by chemical plating and light-induced plating technology, and a uniform and compact plating layer is formed by electroplating nickel and copper and good efficiency can be obtained.
The existing commercial solar cell electroplating equipment adopts chain type transmission electroplating, the length is up to 50 meters, the occupied area is large, anodes are perpendicular to cells to be electroplated on two sides of an electroplating bath, a row of cells to be electroplated are continuously transmitted from the middle of the electroplating bath for electroplating, the production efficiency is low, and the construction and maintenance cost is high.
SUMMERY OF THE UTILITY MODEL
In view of the above-mentioned drawbacks and deficiencies of the prior art, it is desirable to provide a plating apparatus for crystalline silicon solar cell electrodes with high production efficiency.
The utility model provides an electroplating device for crystalline silicon solar cell electrodes.
An electroplating device for crystalline silicon solar cell electrodes comprises an electroplating power supply, a flower basket, a plurality of metal electrodes, a support rod, a fixing unit and an electroplating bath with an opening at the top; the flower basket is arranged in the electroplating bath in a removable way, the flower basket is provided with a plurality of vertically arranged battery piece accommodating grooves, the top of the battery piece containing groove is provided with a plug-in port, the metal electrode is positioned in the electroplating groove, the metal electrodes are parallel to and in one-to-one correspondence with the battery piece accommodating grooves, the metal electrodes are electrically connected with the anode of the electroplating power supply, a supporting rod is arranged above the electroplating bath, a plurality of fixing units are connected on the supporting rod, each fixing unit comprises a clamping piece extending into the electroplating bath, the battery piece accommodating grooves correspond to the clamping pieces one by one, the clamping pieces are provided with clamping grooves with openings facing the battery piece accommodating grooves, the clamp groove is internally provided with an elastic conductive element which is used for pressing the battery piece to be electroplated into the clamp groove and is electrically connected with the battery piece to be electroplated, and the elastic conductive element is electrically connected with the negative electrode of the electroplating power supply.
Above-mentioned scheme, it adopts the basket of flowers of large capacity to go up unloading, need not treat and electroplate the battery piece and carry out chain transmission, it treats in electroplating process and electroplates the battery piece and need not convey, for current electroplating device, the length of its plating bath of electroplating device of this scheme can be done short promptly and satisfy the electroplating needs, therefore area is little, each holder of being connected with the negative pole during electroplating is connected and is treated electroplating the battery piece, general holder is connected on treating the electric contact that electroplates the battery piece and form specially for electroplating, treat that the quantity of electroplating the battery piece is decided according to the quantity of holder, generally once can treat to electroplate the battery piece simultaneously and carry out the electrodeposition to hundreds of battery pieces simultaneously, for example once can treat to electroplate the battery piece to carry out the electrodeposition simultaneously to 400-500, and production efficiency is high. In addition, come the one-to-one through a plurality of fixed units and connect the multi-disc battery piece of treating to electroplate when electroplating, the battery piece floats and does not have the control to rock when preventing to electroplate, avoids battery piece and basket of flowers to collide with to guarantee electroplating quality.
Furthermore, the clamping piece comprises a connecting seat, a first fixing plate and a second fixing plate are arranged on the same side of the connecting seat in parallel at intervals, and a clamping groove is formed between opposite surfaces of the first fixing plate and the second fixing plate.
Furthermore, the elastic conductive element is an electrical contact which is movably matched with the first fixing plate, one end of the electrical contact, which is positioned in the clamping groove, is provided with an axial positioning surface, the axial positioning surface is positioned at one end of the electrical contact, which is positioned in the clamping groove, a spring is arranged on the electrical contact in a penetrating manner, and the spring is pressed between the axial positioning surface and the first fixing plate.
Furthermore, the elastic conductive element is a metal elastic sheet, the metal elastic sheet is fixedly connected with the first fixing plate, and the metal elastic sheet extends towards the second fixing plate in an inclined manner from the opening of the clamping groove to the bottom direction.
Furthermore, a protrusion is arranged on the surface of the second fixing plate facing the first fixing plate.
Further, an electrolyte circulation unit is arranged in the electroplating tank.
Further, the support rod extends in a horizontal direction.
Further, the clamping piece is connected with the supporting rod in a rotating mode, and the rotating angle of the clamping piece around the axis of the supporting rod is smaller than 30 degrees
Further, the flower basket is a polyethylene flower basket, a polyvinylidene fluoride flower basket or a polytetrafluoroethylene flower basket.
Further, the electroplating power supply is a direct current power supply or a pulse power supply.
Drawings
Other features, objects and advantages of the present application will become more apparent upon reading of the following detailed description of non-limiting embodiments thereof, made with reference to the accompanying drawings in which:
fig. 1 is a schematic structural diagram of an electroplating device for a crystalline silicon solar cell electrode provided by an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a cell to be electroplated;
fig. 3 is a schematic structural view of a clamping member according to an embodiment of the present invention;
fig. 4 is a schematic structural view of a clamping member according to another embodiment of the present invention.
Detailed Description
The present application will be described in further detail with reference to the following drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the relevant invention and are not limiting of the invention. It should be noted that, for convenience of description, only the portions related to the present invention are shown in the drawings.
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail below with reference to the embodiments with reference to the attached drawings.
As shown in fig. 1, the electroplating device for crystalline silicon solar cell electrodes provided by the present invention comprises an electroplating power supply, a flower basket 2, a plurality of metal electrodes 5, a support rod 4, a fixing unit and an electroplating bath 1 with an open top. For example, but not limiting of, the plating bath 1 is a square bath. The plating bath 1 contains a plating solution, which may include, for example and without limitation, a water-soluble metal salt, a buffer, and the concentration of the plating solution may be maintained stable by adding copper powder, nickel powder, copper oxide powder, copper salt, or nickel salt to the plating bath 1 during the plating process.
The flower basket 2 is arranged in the electroplating bath 1 in a removable manner, the flower basket 2 is provided with a plurality of vertically arranged cell accommodating grooves, and the tops of the cell accommodating grooves are provided with inserting ports. During material loading, the battery piece 6 to be electroplated is inserted into the battery piece accommodating groove of the flower basket 2 from the insertion opening, one battery piece is inserted into each battery piece accommodating groove, after the battery piece is filled in the flower basket 2, the flower basket and the battery piece are placed into the electroplating bath 1 together for electroplating, and after the electroplating is finished, the flower basket and the battery piece are taken out from the electroplating bath 1 together. The metal electrode 5 is positioned in the electroplating bath 1, the metal electrode 5 is parallel to the battery piece containing grooves, the battery piece containing grooves are in one-to-one correspondence with the metal electrodes 5, namely, one metal electrode 5 is correspondingly arranged on one battery piece containing groove, two metal electrodes 5 are correspondingly arranged on two battery piece containing grooves, and the like. In order to balance the productivity and the electroplating quality, the distance between the battery pieces 6 to be electroplated is generally 1cm-10 cm. The battery piece containing groove has a certain fixing effect on the battery piece 6 to be electroplated, and the problem that the electroplating effect is reduced due to the fact that the battery piece 6 to be electroplated floats and moves without control during electroplating is solved.
The metal electrode 5 is, for example, but not limited to, a sheet electrode, and the metal electrode 5 is immersed in a plating solution during plating. Wherein, the metal electrode 5 is connected with the anode of the electroplating power supply. A supporting rod 4 is arranged above the electroplating bath 1, a plurality of fixing units 3 are connected to the supporting rod 4, and the fixing units 3 can be fixedly connected to the supporting rod 4 or movably connected to the supporting rod 4.
The fixing units 3 are, for example, but not limited to, rod-shaped members, each fixing unit 3 includes a clamping member extending into the electroplating tank 1, the cell accommodating grooves correspond to the clamping members one by one, that is, one clamping member corresponds to one cell accommodating groove, two clamping members correspond to two cell accommodating grooves, and so on. The clamping piece is provided with a clamping groove with an opening facing the battery piece accommodating groove, an elastic conductive element which is used for pressing the battery piece 6 to be electroplated into the clamping groove and is electrically connected with the battery piece 6 to be electroplated is arranged in the clamping groove, and the elastic conductive element is electrically connected with the negative electrode of the electroplating power supply. During electroplating, the elastic conductive element is tightly pressed on the electric contact 7 on the battery piece 6 to be electroplated. According to different types of batteries, an electric contact 7 is locally formed on the front surface and/or the back surface of the battery piece 6 to be electroplated, the electric contact 7 is formed on a single surface of the single-surface battery, correspondingly, grid lines are generated on one side of the battery piece 6 to be electroplated in an electroplating mode, if the battery piece is a double-surface battery, the electric contact 7 is formed on two sides of the battery piece 6 to be electroplated, and correspondingly, the grid lines are generated on two sides of the battery piece 6 to be electroplated in an electroplating mode. When grid lines are produced on the two sides, the electric contacts 7 on the two sides of the battery piece 6 to be electroplated can be connected with the negative electrode simultaneously so as to carry out electrodeposition simultaneously. In this case, the front and back deposition rates of the battery piece 6 to be electroplated are different, the electrodeposition rate on the side connected with the negative electrode is high, and the electrodeposition rate on the other side is low, so that the electrodeposition thickness on the two sides is uniform, and after electroplating for a period of time, the electrical contact 7 on the other side is connected with the negative electrode.
The electrical contacts 7 are formed by sintering the printed electrode paste, and the shape of the electrical contacts 7 includes, but is not limited to, a bar shape, a circle shape, a square shape, a character shape, or any irregular pattern.
Above-mentioned scheme, need not treat and electroplate battery piece 6 and carry out chain transmission, it can adopt the basket of flowers 2 of large capacity to go up unloading, it treats to electroplate battery piece 6 and need not convey in electroplating process, for current electroplating device, the electroplating device of this scheme's electroplating device's the shorter that can do of plating bath 1 satisfies the electroplating needs promptly, therefore area is little, each holder connection that is connected with the negative pole during electroplating treats and electroplates battery piece 6, general holder connection is on treating the electric contact 7 that electroplates and form specially on the battery piece 6, treat that the quantity of electroplating battery piece 6 is decided according to the quantity of holder, generally once can treat to electroplate battery piece 6 and carry out the electrodeposition simultaneously to hundreds of pieces simultaneously, for example once can treat to electroplate battery piece and carry out the electrodeposition simultaneously to 400-500, high production efficiency. The scheme can be suitable for electroplating without preparing a seed layer, simplifies the preparation process of the electrode, solves the problem that the cell sheet is not conductive and can not be electroplated, and has simple reaction of electrochemically depositing a metal layer and high pH value of the electrolyte.
Further, as shown in fig. 3, the clamping member includes a connecting base 8, a first fixing plate 13 and a second fixing plate 9 are disposed in parallel on the same side of the connecting base 8 at an interval, and a clamping groove is formed between opposite surfaces of the first fixing plate 13 and the second fixing plate 9. The structure forms a U-shaped component for fixing the battery piece 6 to be electroplated, and has the advantages of simple structure and convenient use.
Further, the elastic conductive element is an electrical contact 12, such as but not limited to the electrical contact 12 being a rod-shaped member, and the electrical contact 12 is movably engaged with the first fixing plate 13, where the movable engagement may be a sliding manner, a rotating manner, or the like. In the embodiment, the sliding fit is taken as an example for explanation, a through hole is provided on the first fixing plate 13, and the electrical contact 12 is inserted into the through hole to achieve the sliding fit with the first fixing plate 13. One end of the electric contact 12, which is located in the clamping groove, is provided with an axial positioning surface 10, for example, one end of the electric contact 12 is provided with a hemispherical protrusion, the diameter of the hemispherical protrusion is larger than the diameter of the rest part of the electric contact 12, a step surface is formed at the position where the hemispherical protrusion is connected with the rest part of the electric contact 12, the step surface is the axial positioning surface 10, the electric contact 12 is provided with a spring 11 in a penetrating manner, the spring 11 is pressed between the axial positioning surface and a first fixing plate 13, under the action of the spring 11, the electric contact 12 can be tightly pressed against the electric contact 7 of the battery piece 6 to be electroplated during electroplating, so that the electric contact 12 is electrically connected with the electric contact 7 well, and the electric contact 12 is connected with the negative electrode of an electroplating power supply through a lead 14.
As another implementation manner, as shown in fig. 4, the elastic conductive element is a metal elastic sheet 15, the metal elastic sheet 15 is fixedly connected to the first fixing plate 13, and the metal elastic sheet 15 extends obliquely toward the second fixing plate 9 from the opening of the clamping groove to the bottom direction. For example, but not limited to, one end of the metal elastic sheet 15 is fixed at the position of the first fixing plate 13 near the edge of the clamping slot, the other end of the metal elastic sheet overhangs towards the bottom of the clamping slot, and the metal elastic sheet 15 inclines towards the second fixing plate 9. The opening part size of pressing from both sides the groove is the biggest, and is more and more littleer toward the bottom size of pressing from both sides the groove along metal shrapnel 15, adopts this kind of structure, can be relatively easy will wait to electroplate battery piece 6 card in pressing from both sides the groove, and leans on the elasticity of metal shrapnel 15, can fix on the one hand and wait to electroplate battery piece 6, and on the other hand metal shrapnel can be in the same place with waiting to electroplate the tight top of electrical contact 7 of battery piece 6, realizes good electrical contact. The metal elastic sheet 15 is connected with the cathode of the electroplating power supply through a lead 14.
Furthermore, in order to improve the reliability of the clamping piece in connection with the battery piece, a protrusion is arranged on the surface of the second fixing plate facing the first fixing plate. Generally, the protrusion is opposite to the end of the electrical contact 12 or the metal dome 15, and the battery piece is firmly clamped by the electrical contact 12 or the metal dome 15 corresponding to the protrusion.
Further, in order to improve the quality and efficiency of the plating, the plating tank 1 may further include an electrolyte circulation unit and a filtering unit (not shown) to promote the uniformity of the flow and concentration of the electrolyte, so that the finally formed plating layer is uniform and dense. The electrolyte circulation unit may be a pump circulation unit or an agitation circulation unit. The filtering unit is used for filtering metal particles formed in the electroplating process and preventing the metal particles from being adhered to the coating to influence the granularity of crystals of the coating so as to improve the fineness of the coating.
Further, the support rod 4 extends in the horizontal direction. Generally, the distance between the support rod 4 and the top opening is larger than the vertical placement height of the battery piece 6 to be electroplated, so as to facilitate the placement of the battery piece 6 to be electroplated in the electroplating bath 1 and the connection with the clamping member. The connection process can be that firstly, the battery piece 6 to be electroplated is vertically placed in the electroplating bath 1 through the flower basket 2, and then the battery piece 6 to be electroplated is moved upwards to be clamped in the clamping groove of the clamping piece.
As one of the realizable modes, the clamping piece is rotationally connected with the supporting rod 4, the rotating angle of the clamping piece around the axis of the supporting rod is smaller than 30 degrees, the clamping piece has the small-angle swinging range, and the installation of the battery piece to be electroplated 6 can be facilitated. In addition, in the electroplating process, if an electrolyte circulating unit is arranged, the electrolyte can circularly flow in the electroplating bath 1, the flowing electrolyte can enable the clamping piece to swing, the fluid impact force on the battery piece 6 to be electroplated can be reduced in the swinging process, the battery piece 6 to be electroplated can be protected to a certain extent, the swinging direction of the battery piece 6 to be electroplated is parallel to the metal electrode 5, even if the metal electrode 5 with a smaller area is adopted, most of the area of the battery piece 6 to be electroplated can be covered along with the swinging of the battery piece 6 to be electroplated, the electric field is optimized, and the electroplating quality is improved.
Further, the flower basket 2 is a polyethylene flower basket, a polyvinylidene fluoride flower basket or a polytetrafluoroethylene flower basket, and the flower basket made of the insulating and corrosion-resistant material can prevent impurities from being introduced in the electroplating process, so that the electroplating quality is reduced.
Furthermore, the electroplating power supply is a direct current power supply or a pulse power supply. When using a dc power supply, the electrochemical deposition rate is faster than a pulsed power supply at the same current density. Of course, a pulsed power supply may be used, which has the advantage that the deposited electrode is smooth and flat, but the deposition rate is relatively slow.
The above description is only a preferred embodiment of the application and is illustrative of the principles of the technology employed. It will be appreciated by those skilled in the art that the scope of the invention herein disclosed is not limited to the particular combination of features described above, but also encompasses other arrangements formed by any combination of features described above or equivalents thereof without departing from the inventive concept. For example, the above features may be replaced with (but not limited to) features having similar functions disclosed in the present application.

Claims (10)

1. An electroplating device for a crystalline silicon solar cell electrode is characterized by comprising an electroplating power supply, a flower basket, a plurality of metal electrodes, a support rod, a fixing unit and an electroplating bath with an opening at the top;
the flower basket is arranged in the electroplating bath in a removable manner, the flower basket is provided with a plurality of vertically arranged cell containing grooves, the tops of the cell containing grooves are provided with inserting ports, the metal electrodes are positioned in the electroplating bath, the metal electrodes are parallel to the cell containing grooves and correspond to the cell containing grooves one by one, and the metal electrodes are electrically connected with the anode of the electroplating power supply;
the electroplating bath is characterized in that a supporting rod is arranged above the electroplating bath, a plurality of fixing units are connected onto the supporting rod, each fixing unit comprises a clamping piece extending into the electroplating bath, the cell accommodating grooves correspond to the clamping pieces one to one, each clamping piece is provided with a clamping groove with an opening facing the cell accommodating groove, each clamping groove is internally provided with an elastic conductive element, the elastic conductive element is used for pressing the cell to be electroplated into the clamping groove and electrically connecting the cell to be electroplated, and the elastic conductive element is electrically connected with the negative electrode of the electroplating power supply.
2. The electroplating device for the crystalline silicon solar cell electrode as claimed in claim 1, wherein the clamping member comprises a connecting base, a first fixing plate and a second fixing plate are arranged in parallel on the same side of the connecting base at intervals, and the clamping groove is formed between the opposite surfaces of the first fixing plate and the second fixing plate.
3. The electroplating device for the crystalline silicon solar cell electrode as claimed in claim 2, wherein the elastic conductive element is an electrical contact, the electrical contact is movably matched with the first fixing plate, the electrical contact is provided with an axial positioning surface, the axial positioning surface is positioned at one end of the electrical contact in the clamping groove, a spring is threaded on the electrical contact, and the spring is pressed between the axial positioning surface and the first fixing plate.
4. The electroplating device for the crystalline silicon solar cell electrode as claimed in claim 2, wherein the elastic conductive element is a metal spring, the metal spring is fixedly connected with the first fixing plate, and extends obliquely towards the second fixing plate from the opening of the clamping groove to the bottom.
5. The apparatus for electroplating the crystalline silicon solar cell electrode as claimed in claim 3 or 4, wherein a surface of the second fixing plate facing the first fixing plate is provided with a protrusion.
6. The apparatus for electroplating the crystalline silicon solar cell electrode as claimed in any one of claims 1 to 4, wherein an electrolyte circulation unit is disposed in the electroplating tank.
7. The apparatus for electroplating crystalline silicon solar cell electrode as claimed in any one of claims 1 to 4, wherein the support bar extends in a horizontal direction.
8. The apparatus for electroplating the crystalline silicon solar cell electrode as claimed in claim 7, wherein the clamping member is rotatably connected to the supporting rod; the rotation angle of the clamping piece around the axis of the supporting rod is less than 30 degrees.
9. The device for electroplating crystalline silicon solar cell electrode according to any one of claims 1 to 4, wherein the flower basket is a polyethylene flower basket, a polyvinylidene fluoride flower basket or a polytetrafluoroethylene flower basket.
10. The electroplating device for the crystalline silicon solar cell electrode, as claimed in any one of claims 1-4, wherein the electroplating power source is a direct current power source or a pulse power source.
CN201920952561.XU 2019-06-24 2019-06-24 Electroplating device for crystalline silicon solar cell electrode Active CN210560844U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201920952561.XU CN210560844U (en) 2019-06-24 2019-06-24 Electroplating device for crystalline silicon solar cell electrode

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201920952561.XU CN210560844U (en) 2019-06-24 2019-06-24 Electroplating device for crystalline silicon solar cell electrode

Publications (1)

Publication Number Publication Date
CN210560844U true CN210560844U (en) 2020-05-19

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