A liquid transmission system and its application method on solar cells

Abstract

The present invention relates to a liquid transmission system and its application method on solar cells, comprising a liquid tank, wherein the liquid is stored in the liquid tank; a plurality of liquid outlets, which are arranged along the length direction of the liquid tank; a rotating shaft, which can be continuously rotated clockwise, continuously counterclockwise, continuously swing left and right, or intermittently; and a liquid transmission device, wherein, driven by the rotating shaft, the liquid in the liquid tank of the liquid transmission device is simultaneously transported to a plurality of liquid outlets, so as to realize uniform liquid discharge from multiple outlets. The present invention has a compact and reasonable structure, is easy to operate, and can realize accurate and controllable transportation of electroplating liquid with a very small flow rate, thereby improving transportation efficiency and transportation effect.

Description

Technical Field

[0001] The invention relates to the technical field of electroplating liquid transportation, in particular to a liquid separation system. Background Art

[0002] Chinese patent CN105543923B discloses a method and equipment for horizontal electroplating. In this patent, in order to achieve the purpose of simultaneous electroplating of the upper and lower surfaces, the electroplating solution needs to be coated on the upper surface of the solar cell. At the same time, the patent also points out that "there are conductive rollers outside the two sides of each independent electroplating liquid tank, and each independent electroplating tank and the conductive rollers outside the two sides of each independent electroplating liquid tank are below the crystalline silicon solar cell thin film substrate." Therefore, multiple coating ports need to be set. Usually in large-scale production equipment, a battery electroplating mass production equipment usually requires dozens or even hundreds of liquid addition ports to meet the requirement of continuously adding electroplating solution to the upper surface of the battery cell.

[0003] Moreover, in order to achieve the requirement of uniform distribution of the plating solution on the surface of each solar cell, the plating solution needs to be applied to the surface of each solar cell separately. In order to maintain the concentration of the plating solution on the surface of the solar cell, the plating solution needs to be continuously added to the surface of the solar cell to meet the electroplating requirements.

[0004] In order to control the plating rates of the upper and lower surfaces separately, it is necessary to avoid contact between the plating solution on the upper surface of the solar cell and the plating solution in the plating tank below the cell, that is, the flow rate of the plating solution added to the upper surface of the solar cell needs to be precisely controlled.

[0005] Therefore, in order to achieve the electroplating requirements of simultaneously electroplating the upper and lower surfaces of the solar cell and separately controlling the electroplating rates on the upper and lower surfaces of the solar cell, the amount of liquid added to the upper surface of the solar cell needs to meet the three requirements of small flow, multiple outlets, and flow uniformity of multiple outlets.

[0006] The traditional method to meet the above three requirements at the same time is to use multiple parallel pipes for liquid transmission, and each pipe is controlled by a valve. Usually, a mass-produced solar cell electroplating equipment often needs to use dozens or even hundreds of valves to meet these three requirements. However, this flow control method has a big disadvantage. When the valve of one of the pipes changes, it will cause changes in other valves, which will lead to poor flow accuracy and difficulty in control. In other words, it is very difficult to meet these three requirements at the same time. It is further obvious that dozens or even hundreds of valves increase the equipment manufacturing cost and production instability.

[0007] To this end, we propose a liquid transport system and its application method in solar cells. Summary of the invention

[0008] In view of the shortcomings of the above-mentioned existing production technology, the applicant provides a liquid transmission system for providing plating liquid to the upper surface of the solar cell during the electroplating process of the solar cell. The liquid transmission system does not need to rely on any valve adjustment and can simultaneously transmit equal flow rates of liquid to multiple liquid outlets. Furthermore, the liquid transmission system can also adjust the flow rates of the multiple liquid outlets to linearly increase or decrease. Furthermore, the liquid transmission system can make the liquid flow out of each liquid outlet in sequence.

[0009] The technical solution adopted by the present invention is as follows:

[0010] A liquid transfer system, comprising:

[0011] A liquid tank; the liquid tank is connected to a liquid inlet system;

[0012] The liquid outlets include at least one row, and each row has a plurality of outlets arranged along the length direction of the liquid tank;

[0013] A rotating shaft, which is parallel to the length direction of the liquid tank and is rotatably connected to the liquid tank;

[0014] The liquid transmission device is connected to the rotating shaft and is driven by the rotating shaft to controllably transmit the liquid in the liquid tank to multiple liquid outlets.

[0015] Furthermore, the cross-section of the liquid tank includes a rectangle, a circle or other shapes, and the liquid tank is placed horizontally or tilted along its length.

[0016] Furthermore, the liquid outlet is arranged on the side wall or the bottom plate of the liquid tank.

[0017] Furthermore, the rotating shaft is driven by a rotating motor to continuously rotate in a certain direction, to continuously swing left and right, or to intermittently operate.

[0018] Furthermore, an overflow port is provided in the liquid tank, and the overflow port is located at the lower end of the liquid outlet.

[0019] Furthermore, the liquid transfer device is arranged along the length direction of the rotating shaft.

[0020] Furthermore, the liquid transport device includes a plurality of separate liquid transport devices, and the plurality of separate liquid transport devices are distributed on the rotating shaft in parallel, or are connected to the rotating shaft in a spiral distribution manner.

[0021] Furthermore, the liquid transfer device is a plate-like structure, and a plurality of grooves arranged axially along the rotating shaft are provided on the end surface of the liquid transfer device for quantitatively taking liquid as the liquid transfer device rotates, and the number and position of the grooves and the liquid outlet correspond, and a fork is provided between two adjacent grooves.

[0022] Furthermore, a plurality of spoon-type liquid transfer devices are installed on the liquid transfer device, the spoon-type liquid transfer devices are arranged axially along the rotating shaft, and the number and position of the spoon-type liquid transfer devices correspond to the liquid outlets.

[0023] A method for applying a liquid transmission system to a solar cell, the method using the above-mentioned liquid transmission system to transmit plating liquid to the upper surface of a solar cell in a solar cell electroplating machine, comprising the following steps:

[0024] S1, placing the solar cell in a solar cell electroplating machine, connecting the positive electrode of the upper electroplating power source to the upper anode above the solar cell, and connecting the negative electrode of the upper electroplating power source to the cathode roller;

[0025] S2, transferring the plating solution to the upper surface of the solar cell by starting the liquid transfer system;

[0026] S3, turning on the upper electroplating power supply, and the upper surface of the solar cell is electroplated.

[0027] The above-mentioned method for applying the liquid transport system to a solar cell further includes:

[0028] S11, placing the solar cell in a solar cell electroplating machine, and making the lower surface of the solar cell wetted by the electroplating solution in the electroplating tank, the positive electrode of the lower electroplating power supply is connected to the lower anode in the electroplating tank, and the negative electrode of the lower electroplating power supply is connected to the cathode roller;

[0029] S31, turning on the lower electroplating power supply and the upper electroplating power supply at the same time, and the upper and lower surfaces of the solar cell are electroplated at the same time.

[0030] Furthermore, the liquid tank is installed above the solar cell electroplating machine.

[0031] Furthermore, there is at least one liquid filling port above each solar cell in the solar cell electroplating machine.

[0032] The beneficial effects of the present invention are as follows:

[0033] The liquid transmission system of the present invention can transmit liquids from dozens or even hundreds of liquid outlets at the same time, and the liquid flow rate transmitted to the liquid outlets at the same time can be accurately controlled. Furthermore, the liquid transmission system of the present invention has a compact and reasonable structure, is easy to operate, and improves the transmission efficiency and transmission effect.

[0034] At the same time, the present invention also has the following advantages:

[0035] (1) The present invention discloses a liquid transmission system and its application method on a solar cell. After the liquid transmitted by the liquid transmission system reaches the upper surface of the solar cell, the liquid flow reaching the upper surface of the solar cell can be accurately controlled without the aid of any valve.

[0036] (2) Adding plating liquid to more outlets at the same time. By infinitely extending the length of the liquid tank, the liquid transfer device can add plating liquid to multiple outlets while ensuring that the plating liquid in the multiple outlets can be evenly distributed.

[0037] (3) By controlling the number of intervals of the liquid transport device or the rotation speed of the rolling shaft, the delivery amount of the plating liquid can be controlled, thereby achieving precise adjustment of the plating liquid.

[0038] (4) Through the reciprocating periodic swing of the liquid transfer device, the plating liquid can be added to the liquid outlets on the left and right sides respectively, which further improves the efficiency of transferring the plating liquid and optimizes the spatial layout, so that more pipes can be added in a limited space.

[0039] (5) The flow rate of liquid transmission can be adjusted by adjusting the liquid level in the liquid tank. The higher the liquid level in the liquid tank, the more electroplating liquid will be transported to the liquid outlet through the liquid transmission device, and vice versa. Therefore, by adjusting the height of the liquid in the liquid tank, the delivery amount of the electroplating liquid can also be accurately controlled.

[0040] (6) By optimizing the liquid transfer device, for example, designing the liquid transfer device into a dustpan-like structure to scoop out a certain amount of plating liquid in the liquid tank, the delivery accuracy of the plating liquid is improved, and the plating liquid in each outlet can also be made the same.

[0041] (7) By providing comb-tooth grooves in the liquid transfer device, the presence of the comb-tooth grooves can prevent the plating liquid in the liquid tank from being scraped out by other parts, thereby improving the delivery accuracy of the plating liquid. At the same time, the provision of the comb-tooth grooves can also reduce the rotational resistance of the liquid transfer device, thereby improving the overall stability.

[0042] (8) A lifting mechanism is provided on one side of the liquid tank located on the short side. The lifting mechanism can ensure that the liquid tank is level and can also make the liquid tank tilt toward one side. As the liquid tank tilts, the liquid level of the electroplating liquid in the liquid tank will also tilt. At this time, under the drive of the rolling shaft, the amount of electroplating liquid transmitted by the liquid transmission device shows a uniform increasing or decreasing trend, thereby meeting the requirements for adding electroplating liquid under different environments.

[0043] (9) By running the rotating shaft with clearance, the flow rate of the liquid tank to each output port can be controlled to be infinitely small, that is, to meet the process requirements of any small flow rate.

[0044] (10) By mounting each liquid transmission device on the rotating shaft in a spiral distribution at different angles, the liquid can be discharged from each liquid outlet in sequence. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] Figure 1 Schematic diagram of the liquid tank of the present invention.

[0046] Figure 2 for Figure 1 Schematic diagram of the AA cross-section.

[0047] Figure 3 FIG. 4 is a schematic diagram of an embodiment of a liquid transport device according to the present invention.

[0048] Figure 4 Schematic diagram of the structure of the liquid transport device in Example 3 of the present invention.

[0049] Figure 5 Schematic diagram of the structure of the liquid transport device in Example 4 of the present invention.

[0050] Figure 6 This is a schematic diagram of another embodiment of a liquid outlet in Example 7 of the present invention.

[0051] Figure 7 A schematic diagram of an embodiment of the method of the present invention.

[0052] Figure 8 The present invention is a schematic diagram of another embodiment of the method of the present invention.

[0053] In the figure: 100, liquid tank; 200, solar cell electroplating machine; 300, rotating shaft; 400, liquid outlet; 600, liquid transmission device;

[0054] 101, side wall; 102, overflow port; 105, bottom plate;

[0055] 210, solar cell; 220, electroplating tank; 230, cathode roller; 240, transmission pipeline; 250, isolation tank;

[0056] 401, inner opening; 402, outer opening; 601, separate liquid transfer device; 602, groove; 603, fork; 605, spoon-type liquid transfer device. DETAILED DESCRIPTION

[0057] The following embodiments of the present invention are described in conjunction with the accompanying drawings. The following embodiments are described by taking the transportation of electroplating liquid as an example. In actual use, other liquids can be transported, especially liquids that require uniform liquid separation and have a small flow rate.

[0058] Example 1

[0059] like Figure 1 and Figure 2 As shown, the present invention discloses a liquid transmission system for providing electroplating liquid to the upper surface of a solar cell during electroplating of the solar cell, comprising a liquid tank 100, a liquid outlet 400, a rotating shaft 300 and a liquid transmission device 600. One of the characteristics of the liquid transmission system disclosed in the present invention is that after the liquid transmitted by the liquid transmission system reaches the upper surface of the solar cell, the liquid flow reaching the upper surface of the solar cell can be accurately controlled without the aid of any valve.

[0060] Figure 1 A simplified schematic diagram of the liquid delivery system of the present invention is shown. Figure 2 for Figure 1 AA cross-sectional view. Figure 1 and Figure 2 , the embodiment 1 of a liquid transmission system of the present invention can be further described. It should be noted that, Figure 1 As shown, the length direction referred to in this embodiment specifically refers to the long side direction of the liquid tank 100, the rotating shaft 300, and the liquid transfer device 600. In order to add plating liquid to more outlets, the liquid tank 100, the rotating shaft 300, and the liquid transfer device 600 can be extended infinitely in theory.

[0061] like Figure 1 and Figure 2 As shown, a liquid transfer system of the present invention has a liquid tank 100. The cross-section of the liquid tank 100 can be any shape, for example, cylindrical, square, rectangular, elliptical, etc. The liquid tank 100 can be made of a metal material, and can also be made of a non-metallic material. The liquid tank 100 is connected to a liquid inlet port, and the liquid inlet port can be at any position of the liquid tank 100, such as the bottom of the liquid tank 100, the side of the liquid tank 100, the top of the liquid tank 100, etc. The liquid is transferred into the liquid tank 100 by a liquid pump or other device.

[0062] The liquid tank 100 has an overflow port 102. The overflow port 102 only needs to be lower than the liquid outlet 400. Its position is not fixed. The overflow port 102 is used to control the liquid level in the liquid tank 100. The overflow port 102 can be installed on the tank wall on any side of the liquid tank. The optimized overflow port 102 can be adjusted in height, or in other words, the optimized overflow port 102 can adjust the liquid level in the liquid tank 100. Adjusting the liquid level in the liquid tank 100 is one of the means to adjust the flow rate of each liquid outlet. By optimizing the liquid level in the liquid tank 100, and then optimizing the rotation speed of the rotating shaft 300 and the structure of the liquid transmission device 600, it is possible to accurately control the liquid output of each liquid outlet 400.

[0063] In most applications, the liquid tank 100 is placed horizontally along the length of the liquid tank to ensure that the liquid output of each liquid outlet 400 is consistent. In some other applications, the liquid tank 100 can be placed obliquely along the length of the liquid tank. When the liquid tank 100 is placed obliquely, the distance from the liquid level to each liquid outlet 400 is different, so that the liquid output flow rate can be decreased or increased along the length of the liquid tank 100. In principle, the length of the liquid tank 100 is not limited, and the length of the liquid tank 100 depends on the number of liquid outlets 400 and the flow rate of each liquid outlet.

[0064] The rotating shaft 300 is driven by a rotating drive mechanism, and the rotating drive mechanism can be installed inside the liquid tank 100 or outside the liquid tank 100. The rotating shaft 300 can rotate clockwise, counterclockwise, or swing left and right, and the liquid outlets 400 are respectively arranged on both sides of the liquid tank 100. The rotating shaft 300 drives the liquid transmission device 600 to swing back and forth periodically. At this time, the plating liquid can be discharged from both sides of the liquid tank 100 at the same time under the swing of the liquid transmission device 600, and the plating liquid can be added to the liquid outlets 400 on the left and right sides respectively, which further improves the efficiency of adding the plating liquid, and optimizes the spatial layout, so that more pipelines can be added in a limited space.

[0065] In some applications of the present invention, the rotating shaft 300 is in an intermittent operation mode, that is, intermittent operation. Specifically, the rotating shaft 300 rotates once and then stops rotating for a period of time to achieve precise control of a small flow rate of liquid. In the intermittent operation mode, the rotating shaft 300 can control the flow rate to be very small, for example, the flow rate can be controlled to be less than 1 ml / min.

[0066] In some other applications of the present invention, the rotating shaft 300 may be in continuous operation. When the rotating shaft 300 is in continuous operation mode, the faster the rotating speed of the rotating shaft 300 is, the greater the flow rate output by the liquid transmission system of the present invention is.

[0067] The rotating shaft 300 can be installed at the center of the two ends of the liquid tank 100 in the length direction. According to different applications, especially in the application where the liquid outlet 400 is only on one side of the liquid tank 100, the rotating shaft 300 can be installed at any position offset from the center of the liquid tank 100. For example, the rotating shaft 300 can be set at a position closer to the liquid outlet 400 to expand the volume on the other side of the rotating shaft 300, which is conducive to the stability of the liquid level in the liquid tank 100.

[0068] The function of the liquid transport device 600 is to transport the liquid in the liquid tank 100 to the liquid outlet. Figure 1 and Figure 2The simplest liquid transport device 600 of the present invention is shown, which is a flat plate transport device, which is fixed on a surface along the length direction of the rotating shaft. The advantage of the flat plate transport device is that it has a simple structure and can transport the same amount of liquid to multiple liquid outlets in most cases.

[0069] exist Figure 1 and Figure 2 In the schematic diagram of FIG. 1 , two liquid transport devices 600 are fixed on the surface of the rotating shaft 300 along the length direction of the liquid tank 100. According to different applications of the present invention, one liquid transport device 600 can be fixed on the rotating shaft 300, or more than one liquid transport device 600 can be installed. Under the condition of the same rotating speed of the rotating shaft 300, the more liquid transport devices 600 are fixed on the rotating shaft 300, the greater the liquid flow rate of the liquid outlet 400.

[0070] Further, in Figure 1 and Figure 2 In the schematic diagram, the liquid outlet 400 is arranged on one side of the liquid tank 100 along the length direction of the tank body, and forms a liquid discharge port 400. The number of each liquid discharge port 400 is multiple and is arranged along the length direction of the liquid tank (100). In some other applications of the present invention, the liquid outlet 400 can be arranged on both sides of the liquid tank 100 along the length direction of the tank body, that is, there are two liquid discharge ports 400. The advantage of arranging the liquid outlet 400 on both sides of the liquid tank 100 along the length direction of the tank body is that the number of liquid outlets 400 can be doubled within a unit length. Depending on different applications, the liquid outlet 400 can be various shapes, for example, the liquid outlet 400 can be circular, square, or elliptical. The liquid outlet 400 can be installed below the center of the rotation axis, or it can be installed above the center of the rotation axis. As Figure 2 As shown, the optimized liquid outlet 400 is inclined downward from the inner port 401 of the liquid tank 100 to the outer port 402 of the liquid tank 100. The further optimized inclination angle is as large as possible, so that the liquid transferred by the liquid transfer device 600 to the inner port 401 of the liquid outlet 400 can leave the liquid tank 100 as quickly as possible by relying on its own gravity.

[0071] The liquid transmission system of the present invention can adjust and control the flow rate of the liquid output by various methods. For example, the faster the rotation speed of the rotating shaft 300, the greater the flow rate of the output liquid. Alternatively, the output flow rate of the liquid can also be controlled by the liquid level in the liquid tank 100. The higher the liquid level, the greater the flow rate of the output liquid. Further, the flow rate of the output liquid can be controlled by installing different numbers of liquid transmission devices 600 on the rotating shaft 300. The more liquid transmission devices 600 on the rotating shaft 300, the greater the flow rate of the output liquid. Therefore, the present invention can control the flow rate of the output liquid by a variety of methods, and by optimizing each control method, it can achieve precise control of the flow rate.

[0072] Example 2

[0073] In this embodiment, the difference from the embodiment 1 is that: Figure 1 and Figure 2 The flat liquid transport device 600 is provided with a fork 603 (i.e., a plurality of openings are provided on a side of the flat liquid transport device 600 away from the rotating shaft 300), or the flat liquid transport device 600 is split into a plurality of separate liquid transport devices 601, referring to Figure 3 Each individual liquid transport device 601 corresponds to each liquid outlet 400. All individual liquid transport devices 601 constitute a liquid transport device 600. Figure 3 , the individual liquid transport devices 601 are fixed in a row in the axial direction on the rotating shaft 300, and the number of the plurality of individual liquid transport devices 601 in a row in the axial direction corresponds to the number and position of the liquid outlets 400. The individual liquid transport devices 601 can be fixed in multiple rows in the axial direction, such as Figure 3 As shown, two rows of separate liquid transport devices 601 are axially fixed. The advantage of the bifurcated transport device 601 is that the energy required for the liquid transport device 600 to be rotated is relatively small, and further, the bifurcated transport device 601 causes relatively small disturbance to the liquid during rotation, which can improve the uniformity of the infusion flow rate of each liquid outlet 400.

[0074] Furthermore, a groove 602 is formed on the edge of the individual liquid transfer device 601 of the liquid transfer device 600 of this embodiment, and the number of grooves in each row is equal to the number of liquid outlets. The advantage of forming grooves on the edge of the individual liquid transfer device 601 is that the efficiency of liquid transfer of the liquid transfer system of the present invention can be improved.

[0075] Example 3

[0076] In this embodiment, Figure 1 and Figure 2 The flat liquid transport device 600 is also replaced by a separate liquid transport device 601. Figure 4Furthermore, each individual liquid transport device 601 is installed in a spiral distribution manner in the axial direction of the rotating shaft 300. This installation method of the individual liquid transport device 601 can achieve the purpose of sequentially transporting liquid to each liquid outlet 400.

[0077] Example 4

[0078] In this embodiment, the difference from the embodiment 1 and the embodiment 2 is that a plurality of spoon-type liquid transfer devices 605 are installed on the liquid transfer device in the embodiment 1 or the embodiment. Figure 5 Compared with the groove type liquid transfer device, the spoon type liquid transfer device 605 has the advantage of more accurate liquid transfer flow rate. According to different applications, each spoon type liquid transfer device 605 can also be forked 603.

[0079] Example 5

[0080] The difference between this embodiment and the first embodiment is that the inclined liquid outlet 400 in the first embodiment is replaced by a liquid outlet 400 pointing vertically downward. Figure 6 As shown, the liquid outlet 400 flows downward along the side wall 101 of the liquid tank 100 and flows out at the bottom plate 105 of the liquid tank. The advantage of this design is that after the liquid is transferred to the inner port 401 of the liquid outlet 400, the liquid flows downward in a free fall manner, and when the liquid reaches the outer port 402 of the liquid outlet of the liquid tank 100, it has a certain flow kinetic energy, which can overcome the resistance generated by various connecting components at the outer port 402 of the liquid outlet 400, so that the liquid in the liquid outlet 400 can smoothly flow out of the liquid outlet 400, reach various liquid transmission pipelines, and finally smoothly reach the upper surface of the solar cell.

[0081] Example 6

[0082] This embodiment discloses an application method of a liquid transfer system on a solar cell. This embodiment briefly describes the application method of the liquid transfer system of the present invention. Figure 7 , Figure 7 The left and right ends of the solar cell electroplating machine 200 represent the first and last ends of the solar cell electroplating machine 200. The liquid transmission system of the present invention is located above the solar cell electroplating machine 200, or in other words, the liquid transmission system of the present invention can also be regarded as a part of the solar cell electroplating machine 200.

[0083] In this embodiment, according to actual conditions, the upper and lower surfaces of the solar cell 210 may be electroplated simultaneously, or only the upper surface of the solar cell 210 may be electroplated.

[0084] like Figure 7As shown, the application method of the liquid transmission system of this embodiment on a solar cell, the method uses the above-mentioned liquid transmission system to transmit the plating liquid to the upper surface of the solar cell 210 in the solar cell electroplating machine 200, and includes the following steps:

[0085] S1, placing the solar cell 210 in the solar cell electroplating machine 200, connecting the positive electrode of the upper electroplating power source to the upper anode above the solar cell 210, and connecting the negative electrode of the upper electroplating power source to the cathode roller 230;

[0086] S2, transferring the plating solution to the upper surface of the solar cell 210 by starting the liquid transfer system;

[0087] S3, turning on the upper electroplating power supply, and the upper surface of the solar cell 210 is electroplated.

[0088] Thus, the electroplating effect is achieved only on the upper surface of the solar cell 210 .

[0089] At the same time, if the following steps are added to S1 and S3:

[0090] S11, placing the solar cell 210 in the solar cell electroplating machine 200, and making the lower surface of the solar cell 210 wetted by the electroplating solution in the electroplating tank 220, the positive electrode of the lower electroplating power source is connected to the lower anode in the electroplating tank 220, and the negative electrode of the lower electroplating power source is connected to the cathode roller 230;

[0091] S31 , turning on the lower electroplating power supply and the upper electroplating power supply at the same time, and the upper and lower surfaces of the solar cell 210 are electroplated at the same time.

[0092] According to the description of embodiments 1-5, the liquid transfer system of the present invention is composed of a liquid tank 100, a rotating shaft 300, a liquid outlet 400 and a liquid transfer device 600. Since the rotating shaft 300 and the liquid transfer device are installed inside the liquid tank, Figure 7 In the figure, the rotating shaft 300 and the liquid transport device 600 are not shown. The liquid transport device 600 used in this embodiment can be any one of the liquid transport devices in embodiments 1-4.

[0093] The optimization scheme of the liquid transmission system of the present invention is to install the liquid transmission system of the present invention above the solar cell electroplating machine 200. The advantage of installing it above the solar cell electroplating machine is that the liquid coming out of the liquid transmission system of the present invention can flow down to the upper surface of the crystalline silicon solar cell by the gravity of the liquid itself, without relying on other transmission tools to transmit the liquid transmitted from the liquid transmission system of the present invention, and without relying on other auxiliary parts such as valves. Of course, in some other applications, the liquid transmission system of the present invention can also be placed in other suitable locations. Figure 7As shown, in this embodiment, the liquid outlet 400 of the liquid transfer system of the present invention is disposed on the side wall 101 of the liquid tank 100 .

[0094] Below the liquid transmission system of the present invention is the electroplating system of the solar cell electroplating machine 200. The solar cell 210 enters the electroplating machine from the head end of the solar cell. The lower surface of the solar cell 210 contacts the electroplating liquid in the electroplating tank 220. The liquid transmission system of the present invention transmits the electroplating liquid through the liquid outlet 400. The transmitted electroplating liquid passes through the transmission pipe 240 and is coated on the upper surface of the solar cell 210. The electroplating liquid on the upper surface of the solar cell 210 contacts the upper anode. There is a lower anode in the electroplating tank 220. The positive pole of the lower electroplating power supply is connected to the lower anode in the electroplating tank 220, and the negative pole of the lower electroplating power supply is connected to the cathode roller 230. The upper electroplating power supply is connected to the upper anode, and the negative pole of the upper electroplating power supply is connected to the cathode roller 230. After the upper DC power supply and the lower DC power supply are turned on at the same time, the electroplating machine 200 can electroplate the upper and lower surfaces of the solar cell 210 at the same time.

[0095] Due to various factors such as the shaking of the machine and the surface tension of the upper anode, the amount of plating solution on the upper surface of the solar cell 210 will gradually decrease during the transfer of the solar cell 210 by the solar cell electroplating machine 200, resulting in the electroplating solution on the upper surface failing to contact the upper anode. On the other hand, since the electroplating process consumes the copper ions contained in the plating solution, the concentration of copper ions in the plating solution on the upper surface of the solar cell 210 will also gradually decrease. In order to ensure that the plating solution on the upper surface of the solar cell 210 can contact the upper anode, and to ensure that the plating solution on the upper surface of the solar cell 210 contains a certain concentration of copper ions, fresh plating solution must be continuously added to the upper surface of the solar cell to ensure that the electroplating on the upper surface can proceed normally. Figure 7 As shown, in this embodiment, there is a plating solution filling port above each plating tank 220 to ensure the copper ion concentration in the plating solution on the upper surface of the solar cell 210. The cell size of the solar cell 210 of this embodiment is 200*200 mm, so the spacing of the liquid outlets 400 of this embodiment is 100 mm. For a mass-producible solar cell plating equipment, the number of solar cell cell tracks is more than four, or in other words, there are at least four cell track in the longitudinal direction of the solar cell plating machine 200, which requires that the spacing of the liquid outlets on the side wall of the liquid tank 100 in the liquid transmission system of the present invention be less than 20 mm.

[0096] There is no limit to the length of the liquid transfer system of the present invention. According to design requirements, the liquid transfer system of the present invention can be made into one meter long, two meters long or even more than 10 meters long.

[0097] In this embodiment, if the lower electroplating power supply is not energized but the upper electroplating power supply is energized, after the liquid transfer system of the present invention provides the plating liquid to the upper surface of the solar cell 210, the solar cell electroplating equipment only plates the upper surface of the solar cell 210.

[0098] Example 7

[0099] See also Figure 8 This embodiment demonstrates the application of the liquid transfer system of the present invention in another solar cell electroplating machine 200. Figure 8 A certain section of the solar cell electroplating machine 200 is shown, either the first section or the last section. Different from the solar cell electroplating machine 200 of Example 6, the solar cell electroplating machine 200 of this embodiment has a large electroplating tank 220, and the cathode roller 230 is isolated from the electroplating solution in the electroplating tank 220 by the isolation tank 250.

[0100] Another difference from Example 6 is that in this embodiment, the liquid outlet 400 of the liquid transfer system of the present invention is arranged on the bottom plate 105 of the liquid tank (see Figure 6 The advantage of this design is that, see Figure 6 When the liquid is transferred to the inner port 401 of the liquid outlet 400, the liquid flows downward in a free fall manner. When the liquid reaches the outer port 402 of the liquid outlet of the liquid tank 100, it has a certain flow kinetic energy, which can overcome the resistance generated by various connecting components at the outer port 402 of the liquid outlet 400, so that the liquid in the liquid outlet 400 can flow out of the liquid outlet 400 smoothly, reach various liquid transmission pipelines, and finally reach the upper surface of the solar cell smoothly.

[0101] Similarly, the liquid transfer system of the present invention is located above the solar cell electroplating machine 200 , or in other words, the liquid transfer system of the present invention can also be regarded as a part of the solar cell electroplating machine 200 .

[0102] According to the description of embodiments 1-5, the liquid transfer system of the present invention is composed of a liquid tank 100, a rotating shaft 300, a liquid outlet 400 and a liquid transfer device 600. Since the rotating shaft 300 and the liquid transfer device are installed inside the liquid tank, Figure 8 In the figure, the rotating shaft 300 and the liquid transport device 600 are not shown. The liquid transport device 600 used in this embodiment can be any one of the liquid transport devices in embodiments 1-4.

[0103] The optimization scheme of the liquid transmission system of the present invention is to install the liquid transmission system of the present invention above the solar cell electroplating machine 200. The advantage of installing it above the solar cell electroplating machine is that the liquid from the liquid transmission system of the present invention can flow down to the upper surface of the crystalline silicon solar cell by the gravity of the liquid itself, without relying on other transmission tools to transmit the liquid transmitted from the liquid transmission system of the present invention, and without relying on other auxiliary parts such as valves. Of course, in some other applications, the liquid transmission system of the present invention can also be placed in other suitable locations.

[0104] Below the liquid transmission system of the present invention is the electroplating system of the solar cell electroplating machine 200. The solar cell 210 enters the electroplating machine from the head end of the solar cell. The lower surface of the solar cell 210 contacts the electroplating liquid in the electroplating tank 220. The liquid transmission system of the present invention transmits the electroplating liquid through the liquid outlet 400 (at the bottom of the liquid tank 100). The transmitted electroplating liquid passes through the transmission pipe 240 and is coated on the upper surface of the solar cell 210. The electroplating liquid on the upper surface of the solar cell 210 contacts the upper anode. There is a lower anode in the electroplating tank 220. The positive pole of the lower electroplating power supply is connected to the lower anode in the electroplating tank 220, and the negative pole of the lower electroplating power supply is connected to the cathode roller 230. The upper electroplating power supply is connected to the upper anode, and the negative pole of the upper electroplating power supply is connected to the cathode roller 230. After the upper DC power supply and the lower DC power supply are turned on at the same time, the electroplating machine 200 can electroplate the upper and lower surfaces of the solar cell 210 at the same time.

[0105] In this embodiment, if there is no lower anode, only an upper anode, and no lower electroplating power supply, only an upper electroplating power supply, the positive pole of the upper electroplating power supply is connected to the upper anode, and the negative pole of the upper electroplating power supply is connected to the cathode roller, when the upper electroplating power supply is energized, and the liquid transfer system of the present invention provides plating liquid to the upper surface of the solar cell 210, the solar cell electroplating equipment only plates the upper surface of the solar cell 210.

[0106] Comparative Example

[0107] The difference from the first embodiment is that the present embodiment does not contain the liquid transfer device 600, and the plating liquid is added only by overflowing the liquid tank 100 into the flow guide tube. This method is theoretically feasible, but difficult to implement in practice, mainly because the amount of liquid inlet in the liquid inlet system is not easy to accurately control, and it is also difficult to accurately adjust the delivery amount of the plating liquid. However, if the liquid inlet system is improved in the future, the present embodiment can also be implemented after stable and controllable liquid inlet can be achieved. The structure of the present embodiment is simpler, and it can also achieve uniform flow and reduce the fluctuation of the liquid level of the plating liquid.

[0108] The above description is an explanation of the present invention, not a limitation of the present invention. The scope of the present invention is defined in the claims. Any form of modification may be made within the scope of protection of the present invention.

Claims

1. A liquid transmission system, characterized in that: include: A liquid tank (100), the liquid tank (100) being connected to a liquid inlet system; Liquid outlets (400), which include at least one row, and each row has a plurality of outlets and are arranged along the length direction of the liquid tank (100); A rotating shaft (300) is arranged along the length direction of the liquid tank (100) and is rotatably connected to the liquid tank (100); The liquid transmission device (600) is fixed on the rotating shaft (300) and is driven by the rotating shaft (300) to controllably transmit the liquid in the liquid tank (100) to the plurality of liquid outlets (400).

2. A liquid transfer system according to claim 1, characterized in that: The cross-section of the liquid tank (100) includes a rectangular, circular or other shapes, and the liquid tank (100) is placed horizontally or inclined along its length direction.

3. A liquid transmission system according to claim 1, characterized in that: The liquid outlet (400) is arranged on a side wall (101) or a bottom plate (105) of the liquid tank (100).

4. A liquid transmission system according to claim 1, characterized in that: The rotating shaft (300) is driven by a rotating motor to continuously rotate in a certain direction, to continuously swing left and right, or to intermittently operate.

5. A liquid transmission system according to claim 1, characterized in that: The liquid tank (100) has an overflow port (102) therein, and the overflow port (102) is located at the lower end of the liquid outlet (400).

6. A liquid transmission system according to claim 1, characterized in that: The liquid transmission device (600) is arranged along the length direction of the rotating shaft (300).

7. A liquid transmission system according to claim 1, characterized in that: The liquid transfer device (600) comprises a plurality of separate liquid transfer devices (601), and the plurality of separate liquid transfer devices (601) are distributed in parallel on the rotating shaft (300), or are connected to the rotating shaft (300) in a spiral distribution manner.

8. A liquid transfer system according to any one of claims 1 or 6, characterized in that: The liquid transfer device (600) is a plate-like structure, and a plurality of grooves (602) are provided on the end surface of the liquid transfer device (600) and are arranged axially along the rotation axis (300), and are used for quantitatively taking liquid as the liquid transfer device (600) rotates. The number and position of the grooves (602) and the liquid outlet (400) correspond, and a fork (603) is provided between two adjacent grooves (602).

9. A liquid transfer system according to any one of claims 1, 6 or 7, characterized in that: A plurality of spoon-type liquid transfer devices (605) are installed on the liquid transfer device (600), the spoon-type liquid transfer devices (605) are arranged axially along the rotation axis (300), and the number and position of the spoon-type liquid transfer devices (605) correspond to the liquid outlet (400).

10. A method for applying a liquid transport system to a solar cell, characterized in that: The method uses a liquid transfer system as claimed in any one of claims 1 to 9 to transfer a plating liquid to the upper surface of a solar cell (210) in a solar cell electroplating machine (200), and comprises the following steps: S1, placing the solar cell (210) in a solar cell electroplating machine (200), connecting the positive electrode of the upper electroplating power source to the upper anode above the solar cell (210), and connecting the negative electrode of the upper electroplating power source to the cathode roller (230); S2, starting a liquid transport system to transport the electroplating solution to the upper surface of the solar cell (210); S3, turning on the upper electroplating power supply, and electroplating the upper surface of the solar cell (210).

11. The method for applying a liquid transmission system to a solar cell according to claim 10, characterized in that: Also includes: S11, placing the solar cell (210) in a solar cell electroplating machine (200), and allowing the lower surface of the solar cell (210) to be wetted by the electroplating solution in the electroplating tank (220), the positive electrode of the lower electroplating power source being connected to the lower anode in the electroplating tank (220), and the negative electrode of the lower electroplating power source being connected to the cathode roller (230); S31, turning on the lower electroplating power supply and the upper electroplating power supply at the same time, and electroplating the upper and lower surfaces of the solar cell (210) at the same time.

12. The method for applying a liquid transport system to a solar cell according to any one of claims 10 or 11, characterized in that: The liquid tank (100) is installed above the solar cell electroplating machine (200).

13. The method for applying a liquid transport system to a solar cell according to any one of claims 10 or 11, characterized in that: There is at least one liquid filling port above each solar cell sheet in the solar cell electroplating machine (200).

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