Water film liquid dropping device and solar cell production unit

Abstract

The utility model provides a water film liquid dropping device and a solar cell production unit, and the device comprises a reversing valve which comprises a liquid inlet end, a first liquid outlet end and a second liquid outlet end, and the liquid inlet end is communicated with a liquid dropping barrel used for accommodating a solvent; one end of the first liquid dropping assembly is communicated with the first liquid outlet end; one end of the second liquid dropping assembly is communicated with the second liquid outlet end; the control assembly is used for switching the communication mode in the reversing valve. When the water film liquid dropping device normally operates, the liquid inlet end of the reversing valve is communicated with the first liquid outlet end, the liquid inlet end is not communicated with the second liquid outlet end, and a water film is formed through liquid dropping of the first liquid dropping assembly. When the liquid dropping pipeline is abnormal, the communication mode of the reversing valve can be switched to form a water film through liquid dropping of the second liquid dropping assembly, the water film liquid dropping device does not need to be shut down, the operation time of the water film liquid dropping device is not affected, normal operation of the battery piece cleaning machine is not affected by the abnormity of the liquid dropping pipeline, and the service life of the battery piece cleaning machine is prolonged. And high-efficiency operation and capacity output of battery production equipment are ensured.

Description

Technical Field

[0001] This application belongs to the field of photovoltaic cell technology, and in particular relates to a water film dripping device and a solar cell production unit. Background Technology

[0002] In the solar cell manufacturing process, a chain cleaning machine is used to use HF (hydrofluoric acid) to remove the diffusion layer (borosilicate glass, BSG) formed on the back and periphery of the silicon wafer during diffusion. To protect the front side of the silicon wafer from HF corrosion, a water film device is used to uniformly drip liquid onto the silicon wafer, covering the upper surface of the wafer and forming a protective film.

[0003] However, leaks in the dripping line or uneven dripping due to blockage of the dripping blade can lead to over-etching and leakage of silicon wafers flowing into the etching tank. To prevent the problem from escalating, the dripping equipment needs to be shut down for maintenance to prevent more silicon wafers without complete water film protection from flowing into the etching tank. However, this will affect the uptime of the dripping equipment, thus reducing its production capacity.

[0004] It should be noted that the above content is not necessarily prior art, nor is it intended to limit the scope of patent protection of this application. Utility Model Content

[0005] This application provides a water film dripping device and a solar cell production unit to solve or alleviate one or more technical problems in the prior art.

[0006] The first aspect of this application provides a water film dripping device and a solar cell production unit, including:

[0007] The reversing valve includes an inlet end, a first outlet end, and a second outlet end, wherein the inlet end is connected to a dripping tank for containing solvent;

[0008] The first droplet assembly is connected at one end to the first outlet end of the reversing valve and is used to form a water film by dripping liquid onto the battery cell below it.

[0009] The second droplet assembly is connected at one end to the second outlet end of the reversing valve and is used to form a water film by dripping liquid onto the battery cell below it.

[0010] A control component, electrically connected to the reversing valve, is used to switch the connection mode within the reversing valve; the connection mode includes a first connection mode and a second connection mode, wherein the first connection mode is: the inlet end is connected to the first outlet end, and the inlet end is not connected to the second outlet end; the second connection mode is: the inlet end is not connected to the first outlet end, and the inlet end is connected to the second outlet end.

[0011] Optionally, the first dripping assembly includes a first dripping tube and a first dripping head, with the two ends of the first dripping tube respectively connected to the first outlet end of the reversing valve and the first dripping head;

[0012] The second drip assembly includes a second drip tube and a second drip head, with the two ends of the second drip tube respectively connected to the second outlet end of the reversing valve and the second drip head.

[0013] Optionally, the control component includes a main controller and a photoelectric sensor. The photoelectric sensor is located between the first drop head and the second drop head and is electrically connected to the main controller. The photoelectric sensor is used to detect the integrity of the water film on the battery cell passing below it.

[0014] When the photoelectric sensor detects that the integrity of the water film on the battery cell below it does not reach a preset threshold, the main controller controls the reversing valve to switch to the second connection mode.

[0015] Optionally, the first drip tube is further provided with a first regulating valve, which is located between the first liquid outlet end of the reversing valve and the first drip head.

[0016] Optionally, the first drip tube is further provided with a first on / off valve, which is located between the first outlet end of the reversing valve and the first regulating valve.

[0017] Optionally, the width of the vertical projection of the first drop head is greater than or equal to the width of the vertical projection of the battery cell.

[0018] Optionally, the dripping container is equipped with a liquid level sensor, which is used to detect the liquid level of the solvent in the dripping container.

[0019] Optionally, the dripping tank and the inlet end of the reversing valve are connected by a connecting pipe, and a flow meter is installed on the connecting pipe.

[0020] Optionally, the water film dripping device further includes a transmission assembly located below the first dripping assembly and the second dripping assembly, for moving the battery cell along the direction from the first dripping assembly to the second dripping assembly.

[0021] A second aspect of this application provides a solar cell production unit, including a water film droplet device as described in any of the preceding claims.

[0022] The embodiments of this application employing the above-described technical solution may have the following advantages:

[0023] When the water film dripping device is operating normally, the reversing valve is in the first connection mode, meaning the inlet end is connected to the first outlet end, but not to the second outlet end. This allows the first dripping assembly to drip water onto the battery cells below, forming a water film. If there is a leak in the dripping pipeline or uneven water flow due to blockage of the dripping blade, the control component can switch the reversing valve's connection mode to the second connection mode. In this mode, the inlet end is not connected to the first outlet end, but to the second outlet end. This shuts off the first dripping assembly, allowing the second dripping assembly to drip water onto the battery cells below, forming a water film. In other words, if the first dripping assembly malfunctions, the system can switch to the second dripping assembly to form the water film, ensuring the continuity and integrity of the water film coverage on the silicon wafer surface and preventing over-etching due to an incomplete water film on the silicon wafer surface. Furthermore, there is no need to shut down the water film dripping device for maintenance, which will not affect the operating time of the water film dripping device. This ensures that the battery cell cleaning machine will not be affected by abnormalities in the dripping pipeline, thus guaranteeing the efficient operation and production capacity output of the battery production equipment.

[0024] The above overview is for illustrative purposes only and is not intended to be limiting in any way. In addition to the illustrative aspects, embodiments, and features described above, further aspects, embodiments, and features of this application will become readily apparent from the accompanying drawings and the following detailed description. Attached Figure Description

[0025] In the accompanying drawings, unless otherwise specified, the same reference numerals throughout the various drawings denote the same or similar parts or elements. These drawings are not necessarily drawn to scale. It should be understood that these drawings depict only some embodiments disclosed in this application and should not be construed as limiting the scope of this application.

[0026] Figure 1 This is a schematic diagram of the structure of the water film dripping device provided in the embodiments of this application.

[0027] Explanation of reference numerals in the attached figures:

[0028] Reversing valve 11; dripping tank 12; liquid level sensor 121; connecting pipe 123; flow meter 125; first dripping pipe 131; first dripping head 133; first regulating valve 135; first on / off valve 137; second dripping pipe 141; second dripping head 143; second regulating valve 145; second on / off valve 147; photoelectric sensor 151; transmission assembly 17. Detailed Implementation

[0029] The embodiments of this application are described in detail below, examples of which are illustrated in the accompanying drawings. In the drawings, for clarity, the dimensions of layers, regions, elements, and their relative dimensions may be exaggerated. The same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0030] It should be understood that when an element or layer is referred to as "on," "adjacent to," "connected to," or "coupled to" other elements or layers, it may be directly on, adjacent to, connected to, or coupled to other elements or layers, or there may be intervening elements or layers. Conversely, when an element is referred to as "directly on," "directly adjacent to," "directly connected to," or "directly coupled to" other elements or layers, there are no intervening elements or layers. It should be understood that although the terms first, second, third, etc., may be used to describe various elements, components, areas, layers, and / or portions, these elements, components, areas, layers, and / or portions should not be limited by these terms. These terms are only used to distinguish one element, component, area, layer, or portion from another element, component, area, layer, or portion. Therefore, without departing from the teachings of this application, the first element, component, area, layer, or portion discussed below may be referred to as a second element, component, area, layer, or portion. And the discussion of a second element, component, area, layer, or portion does not imply that the first element, component, area, layer, or portion necessarily exists in this application.

[0031] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0032] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such terms can be used interchangeably where appropriate so that the embodiments of this application described herein can be implemented, for example, in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0033] In this application, when numerical intervals (i.e., numerical ranges) are involved, unless otherwise specified, the distribution of selectable numerical values ​​within the numerical interval is considered continuous, and includes the two endpoints of the numerical interval (i.e., the minimum and maximum values), as well as every numerical value between these two endpoints. Unless otherwise specified, when a numerical interval refers only to integers within that numerical interval, it includes the two endpoint integers of the numerical range, as well as every integer between the two endpoints, which is equivalent to directly listing every integer. When multiple numerical ranges are provided to describe features or characteristics, these numerical ranges can be merged. In other words, unless otherwise specified, the numerical ranges disclosed in this application should be understood to include any and all subranges included therein. The "numerical value" in the numerical interval can be any quantitative value, such as a number, percentage, ratio, etc. The term "numerical interval" can be broadly included to include percentage intervals, ratio intervals, proportion intervals, etc.

[0034] This application provides a water film dispensing device and a solar cell production unit. Based on this, when the water film dispensing device malfunctions, it is unnecessary to shut down the device for maintenance. This ensures that the cell cleaning machine is not affected by abnormalities in the dispensing pipeline, guaranteeing the efficient operation and production capacity of the battery production equipment. See below for details.

[0035] Exemplary embodiments according to this application will now be described in more detail with reference to the accompanying drawings. It should be understood that these exemplary embodiments may be implemented in many different forms and should not be construed as being limited to the embodiments set forth herein.

[0036] Please see Figure 1 This application provides a water film dripping device, which includes a reversing valve 11, a first dripping assembly, a second dripping assembly, and a control assembly. The details are as follows:

[0037] The reversing valve 11 includes an inlet end, a first outlet end, and a second outlet end. The inlet end is connected to a dripping tank 12 for containing solvent. In some embodiments, the solvent can be pure water (DI water, deionized water). Depending on the different process flows, the dripping tank 12 can also contain different liquids, such as silane solution, silicon oxide precursor solution, etc.

[0038] One end of the first droplet assembly is connected to the first outlet end of the reversing valve 11, and is used to drop liquid onto the battery cell below it to form a water film. One end of the second droplet assembly is connected to the second outlet end of the reversing valve 11, and is used to drop liquid onto the battery cell (same as the silicon wafer) below it to form a water film.

[0039] The control component is electrically connected to the reversing valve 11 and is used to switch the connection mode within the reversing valve 11.

[0040] Specifically, the connection method includes at least a first connection method and a second connection method. The first connection method is: the inlet end is connected to the first outlet end, but the inlet end is not connected to the second outlet end. The second connection method is: the inlet end is not connected to the first outlet end, but the inlet end is connected to the second outlet end.

[0041] When the water film dripping device is operating normally, the reversing valve 11 is in the first connection mode, that is, the inlet end is connected to the first outlet end, but not to the second outlet end, so that water film is formed by dripping onto the battery cells below through the first dripping assembly. When there is a leak in the dripping pipeline or uneven water discharge due to blockage of the dripping knife, the connection mode of the reversing valve 11 can be switched by the control component to the second connection mode, that is, the inlet end is not connected to the first outlet end, but connected to the second outlet end, so as to close the first dripping assembly, so that water film is formed by dripping onto the battery cells below through the second dripping assembly. That is, when the first dripping assembly fails, the device can switch to the second dripping assembly to form a water film, ensuring the continuity and integrity of the water film coverage on the silicon wafer surface and avoiding over-etching caused by an incomplete water film on the silicon wafer surface. Furthermore, there is no need to shut down the water film dripping device for maintenance, which does not affect the operating time of the water film dripping device. This ensures that the battery cell cleaning machine is not affected by abnormalities in the dripping pipeline, thus guaranteeing the efficient operation and production capacity output of the battery production equipment.

[0042] In an optional embodiment, the first dripping assembly includes a first dripping tube 131 and a first dripping head 133, with the two ends of the first dripping tube 131 connected to the first outlet end of the reversing valve 11 and the first dripping head 133, respectively. The second dripping assembly includes a second dripping tube 141 and a second dripping head 143, with the two ends of the second dripping tube 141 connected to the second outlet end of the reversing valve 11 and the second dripping head 143, respectively.

[0043] The area and velocity of the droplets can be controlled by the first dropper 133 and the second dropper 143, allowing the liquid to be precisely dripped onto the silicon wafer surface below, forming a continuous water film. This avoids uneven liquid distribution or areas without a water film, effectively protecting the silicon wafer surface from corrosive chemicals such as HF.

[0044] Specifically, the first and second dropper components are arranged side by side, and both the first and second dropper components are located on the moving path of the battery cell. During the movement, the battery cell passes through the first and second dropper components in sequence, so that after the first dropper component stops operating, the battery cell can pass under the second dropper component to replenish the droplets through the second dropper component.

[0045] Furthermore, in this embodiment, the control component includes a main controller and a photoelectric sensor 151. The photoelectric sensor 151 is located between the first dropper head 133 and the second dropper head 143 and is electrically connected to the main controller. The photoelectric sensor 151 is used to detect the integrity of the water film on the battery cell below it. Specifically, the photoelectric sensor 151 emits a laser to irradiate the silicon wafer and detects the intensity of the light reflected back from the surface of the silicon wafer. By analyzing the intensity changes of the reflected light, the integrity and uniformity of the water film on the surface of the silicon wafer are determined. If the integrity of the water film is insufficient, the intensity of the reflected light detected by the photoelectric sensor 151 will show significant fluctuations or abnormalities.

[0046] If the photoelectric sensor 151 detects that the integrity of the water film on the battery cell below it does not reach the preset threshold, it indicates that the first dripping component is abnormal. In order to avoid the production line from stopping the dripping, the main controller controls the reversing valve 11 to switch to the second connection mode. The inlet end of the reversing valve 11 is not connected to the first outlet end, but connected to the second outlet end, that is, switching from the first dripping component to the second dripping component, thereby alleviating the production line shutdown caused by the failure of the first dripping component.

[0047] In an optional embodiment, the first dripping tube 131 is further provided with a first regulating valve 135, which is located between the first outlet end of the reversing valve 11 and the first dripping head 133. The first regulating valve 135 is electrically connected to the control component, which can control parameters such as the dripping rate by adjusting the first regulating valve 135.

[0048] The first regulating valve 135 can adjust the thickness of the water film on the silicon wafer surface by controlling the amount of water flowing through the first dropper head 133. A larger flow rate results in a relatively thicker water film, while a smaller flow rate results in a relatively thinner water film. This allows for adjustment of the water film thickness to meet different silicon wafer surface treatment requirements. For example, in processes with high HF etching intensity, a relatively thicker water film is required to provide stronger protection; at lower etching intensity, a relatively thinner water film suffices.

[0049] If the dripping flow rate is unstable, it may cause the water film to become intermittent or break. The first regulating valve 135 can precisely control the water flow to ensure a stable water flow rate at the dripping head, thereby preventing the water film from breaking. A stable water film can continuously protect the silicon wafer surface, maintain a uniform distribution of the water film across the entire silicon wafer surface, prevent the etchant from directly contacting non-etched areas, and ensure process stability.

[0050] Correspondingly, a second regulating valve 145 is also provided on the second dripping tube 141. The second regulating valve 145 is located between the second outlet end of the reversing valve 11 and the second dripping head 143. The second regulating valve 145 is electrically connected to the control component, which can control parameters such as the dripping rate by adjusting the second regulating valve 145. The function of the second regulating valve 145 is similar to that of the first regulating valve 135 in structure and function, and will not be described in detail here.

[0051] Furthermore, the first drip tube 131 is also provided with a first on / off valve 137, which is located between the first liquid outlet end of the reversing valve 11 and the first regulating valve 135.

[0052] The first on / off valve 137 can directly control the flow of water through or off the first dripping pipe 131. In case of a malfunction or need for maintenance of the first dripping assembly, the first on / off valve 137 can be manually closed to shut off the dripping channel, allowing for individual maintenance or replacement of the first dripping assembly without affecting the operation of other parts of the entire system. The first on / off valve 137 can also quickly shut off the dripping system in emergencies (such as equipment failure or pipe damage) to prevent liquid leakage or excessive dripping, protecting equipment and the environment. This ensures that dripping can be quickly cut off in case of abnormalities, preventing damage to silicon wafers or equipment and thus improving the safety of the entire production line.

[0053] Since the first on / off valve 137 is located between the first liquid outlet of the reversing valve 11 and the first regulating valve 135, even if the first regulating valve 135 has a fault such as leakage, liquid can be prevented from passing through the first regulating valve 135 as long as the first on / off valve 137 is closed.

[0054] Correspondingly, a second on / off valve 147 is also provided on the second drip tube 141. The second on / off valve 147 is located between the second outlet end of the reversing valve 11 and the second regulating valve 145. The function of the second on / off valve 147 is similar to that of the first on / off valve 137, and will not be described in detail here.

[0055] In an optional embodiment, the width of the vertical projection of the first drop head 133 is greater than or equal to the width of the vertical projection of the solar cell, so as to ensure that the water film formed during the drop process can completely cover the upper surface of the silicon wafer and avoid the edges of the silicon wafer surface not being completely covered by the water film.

[0056] Preferably, the width of the projection of the first drop head 133 in the vertical direction is equal to the width of the projection of the battery cell in the vertical direction.

[0057] The production line may process battery cells of different specifications. When the width of the vertical projection of the first dripping head 133 is greater than the width of the vertical projection of the battery cell, the dripping area of ​​the first dripping head 133 can be blocked to match the vertical projection width of the battery cell, thereby preventing excess pure water from dripping outside the battery cell and reducing the waste of dripping.

[0058] In an optional embodiment, a liquid level sensor 121 is provided inside the dripping tank 12, which is used to detect the liquid level of pure water inside the dripping tank 12.

[0059] The liquid level sensor 121 can monitor the pure water level in the dripping tank 12 in real time, ensuring that the pure water in the dripping tank 12 is sufficient during the operation of the water film dripping device, preventing process interruption or incomplete water film on the surface of the battery cell due to insufficient pure water, thereby improving the continuity of production and the stable operation time of the equipment.

[0060] In some embodiments, the liquid level sensor 121 can be connected to the main controller of the control component to trigger automatic water replenishment when the liquid level drops to a preset liquid level height, reducing operator intervention, minimizing manual periodic checks and manual water replenishment, and improving the efficiency and reliability of the production line.

[0061] In an optional embodiment, the inlet end of the dripping tank 12 and the reversing valve 11 are connected by a connecting pipe 123, and a flow meter 125 is configured on the connecting pipe 123.

[0062] The flow meter 125 is used to monitor the flow rate of pure water output from the dripping tank 12 to the inlet of the reversing valve 11. This flow rate corresponds to the flow rate of pure water when the dripping assembly below drips water onto the battery cells. By monitoring the flow rate in real time, it is ensured that the dripping assembly always drips water onto the battery cells at an appropriate speed and volume, thus guaranteeing the stability and integrity of the water film.

[0063] In one embodiment, the flow meter 125 is electrically connected to the main controller. When the flow rate monitored by the flow meter 125 is not within the preset flow rate range, it indicates that the first dripping component of the water film dripping device has malfunctioned, such as leakage in the pipeline. At this time, the main controller controls the reversing valve 11 to switch to the second connection mode to stop the dripping of the first dripping component and reduce the impact of the first dripping component malfunction on the silicon wafer.

[0064] In an optional embodiment, the water film dripping device further includes a transmission assembly 17 located below the first dripping assembly and the second dripping assembly, for moving the battery cell along the direction from the first dripping assembly to the second dripping assembly.

[0065] The transmission component 17 can drive the battery cells to move at a preset speed so that the water film thickness on the surface of the battery cells is uniform.

[0066] When the first dripping assembly malfunctions or requires maintenance, the transmission assembly 17 can move the cell to be dripped to the second dripping assembly to continue dripping the cell, thus switching the dripping assembly without stopping the machine. This also avoids the problem of uneven water film on the cell surface caused by the first dripping assembly failing to drip, which could lead to corrosion, and prevents the production yield and product quality of the cell from being affected.

[0067] This application also provides a solar cell production unit, including a water film droplet device as described in any of the above embodiments.

[0068] After a water film is formed on the surface of a silicon wafer by dripping water onto the wafer using a water film dripping device, an acid solution (such as hydrofluoric acid, HF) can be used to remove the phosphosilicate glass (PSG) on the silicon wafer. This means that the back side and edges of the silicon wafer are treated to remove PSG. At this time, the water film dripping covers the front surface of the silicon wafer to protect it from corrosion by the acid solution.

[0069] After removing the BSG from the back and sides of the silicon wafer, the solar cell production unit can perform other processes on the silicon wafer, such as: plasma etching, which uses plasma technology to dry etch the cell to further adjust the surface structure; anti-reflection layer deposition, which uses PECVD technology to deposit a layer of silicon nitride or silicon oxide on the surface of the cell to reduce light reflection and improve photoelectric conversion efficiency; and metal electrode printing, which prints conductive grid lines on the front and back of the cell, usually using silver paste, followed by drying and sintering.

[0070] It should be noted that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," etc., are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this application. The directional terms "inner" and "outer" refer to the inside or outside relative to the outline of the component itself. For example, if a device in the drawings is inverted, a device described as "above" or "on top of" other devices or structures will subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein are interpreted accordingly.

[0071] It should also be noted that the terms "one embodiment," "another embodiment," and "embodiment" used in this application refer to specific features, structures, or characteristics described in connection with that embodiment, which are included in at least one embodiment described in the general description of this application. The appearance of the same expression in multiple places in the specification does not necessarily refer to the same embodiment. Furthermore, when a specific feature, structure, or characteristic is described in connection with any embodiment, the intention is to suggest that implementing such a feature, structure, or characteristic in conjunction with other embodiments also falls within the scope of this application.

[0072] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0073] It should also be noted that the above are merely preferred embodiments of this application and do not limit the scope of patent protection of this application. Any equivalent structural or procedural changes made using the content of this application’s specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the scope of patent protection of this application.

Claims

1. A water film dripping device, characterized in that, include: The reversing valve includes an inlet end, a first outlet end, and a second outlet end, wherein the inlet end is connected to a dripping tank for containing solvent; The first droplet assembly is connected at one end to the first outlet end of the reversing valve and is used to form a water film by dripping liquid onto the battery cell below it. The second droplet assembly is connected at one end to the second outlet end of the reversing valve and is used to form a water film by dripping liquid onto the battery cell below it. A control component, electrically connected to the reversing valve, is used to switch the connection mode within the reversing valve; the connection mode includes a first connection mode and a second connection mode, wherein the first connection mode is: the inlet end is connected to the first outlet end, and the inlet end is not connected to the second outlet end; the second connection mode is: the inlet end is not connected to the first outlet end, and the inlet end is connected to the second outlet end.

2. The water film dripping device according to claim 1, characterized in that, The first dripping assembly includes a first dripping tube and a first dripping head, with the two ends of the first dripping tube respectively connected to the first liquid outlet and the first dripping head; The second drip assembly includes a second drip tube and a second drip head, with the two ends of the second drip tube connected to the second liquid outlet and the second drip head, respectively.

3. The water film dripping device according to claim 2, characterized in that, The control component includes a main controller and a photoelectric sensor. The photoelectric sensor is located between the first drop head and the second drop head and is electrically connected to the main controller. The photoelectric sensor is used to detect the integrity of the water film on the battery cell below it. When the photoelectric sensor detects that the integrity of the water film on the battery cell below it does not reach a preset threshold, the main controller controls the reversing valve to switch to the second connection mode.

4. The water film dripping device according to claim 2, characterized in that, The first drip tube is also provided with a first regulating valve, which is located between the first liquid outlet end of the reversing valve and the first drip head.

5. The water film dripping device according to claim 4, characterized in that, The first drip tube is also provided with a first on / off valve, which is located between the first liquid outlet of the reversing valve and the first regulating valve.

6. The water film dripping device according to claim 2, characterized in that, The width of the vertical projection of the first drop head is greater than or equal to the width of the vertical projection of the battery cell.

7. The water film dripping device according to any one of claims 1 to 6, characterized in that, The dropper is equipped with a liquid level sensor, which is used to detect the liquid level of the solvent in the dropper.

8. The water film dripping device according to any one of claims 1 to 6, characterized in that, The dripping tank and the inlet of the reversing valve are connected by a connecting pipe, and a flow meter is installed on the connecting pipe.

9. The water film dripping device according to any one of claims 1 to 6, characterized in that, The water film dripping device further includes a transmission component located below the first dripping component and the second dripping component, which is used to move the battery cell along the direction from the first dripping component to the second dripping component.

10. A solar cell production unit, characterized in that, Includes the water film droplet device as described in any one of claims 1 to 9.

Images