Photovoltaic module process device, photovoltaic module production line and photovoltaic cell

Abstract

The utility model provides a photovoltaic module process device, a photovoltaic module production line and a photovoltaic cell, the photovoltaic module process device comprises a pipeline, a heat exchanger and a cleaning tank, the pipeline is used for receiving cleaning liquid at a first preset temperature; the heat exchanger wraps part of the pipeline and is used for changing the temperature of the cleaning liquid passing through the pipeline from a first preset temperature to a second preset temperature; the cleaning tank communicates with the pipeline and is used for receiving and containing cleaning liquid which is output by the pipeline and has a second preset temperature; wherein the cleaning liquid with the second preset temperature is used for soaking the photovoltaic module to be cleaned. According to the embodiment of the invention, the cleaning liquid passes through the heat exchanger, so that the temperature of the cleaning liquid is changed from the first preset temperature to the second preset temperature, and the photovoltaic module is soaked in the cleaning liquid at the second preset temperature, thereby effectively relieving the problem that the temperature of the cleaning liquid in the cleaning tank is too high; and the yield / rework loss is further caused by appearance flower basket marks / water marks on the photovoltaic module.

Description

Technical Field

[0001] The present application belongs to the field of photovoltaic cell technology, and in particular relates to a photovoltaic module process device, a photovoltaic module production line, and a photovoltaic cell. Background Art

[0002] Crystalline silicon solar cell technology is developing rapidly in the industry. Currently, PERC cells and Topcon cells can use alkaline polishing process for single-sided alkaline polishing.

[0003] During the alkaline polishing process, acid- and alkali-resistant baskets can be used to carry and clean silicon wafers. However, friction scratches may occur where the basket contacts the wafer edge, causing wear of the wafer's surface coating. When the wafer is subsequently cleaned with a cleaning solution, residual solution precipitates from the surface. When the basket is removed from the cleaning solution, the wafer surface absorbs this residual solution, resulting in a dirty basket mark / water mark.

[0004] The water temperature of the cleaning liquid is determined by the water supply. However, the temperature in low-latitude areas is relatively high, especially in summer, when the temperature of the water supply can exceed 25°C. If the silicon wafer coating is worn, the appearance of flower basket marks / water marks will further cause yield / rework losses. Utility Model Content

[0005] The embodiments of the present application provide a photovoltaic module process device, a photovoltaic module production line, and a photovoltaic cell to solve or alleviate one or more technical problems in the prior art.

[0006] As one aspect of an embodiment of the present application, an embodiment of the present application provides a photovoltaic module process device, including:

[0007] a conduit for receiving a cleaning liquid at a first predetermined temperature;

[0008] a heat exchanger, wrapping a portion of the pipe, for changing the temperature of the cleaning liquid passing through the pipe from a first predetermined temperature to a second predetermined temperature;

[0009] a cleaning tank, communicated with the pipeline, and configured to receive and contain the cleaning liquid having a second predetermined temperature outputted from the pipeline;

[0010] Wherein, the cleaning liquid with the second predetermined temperature is used to soak the photovoltaic components to be cleaned.

[0011] Optionally, the heat exchanger includes a first containing tank, and the first containing tank is used to contain cooling liquid;

[0012] Part of the pipe is immersed in the cooling liquid.

[0013] Optionally, the length of the pipe immersed in the cooling liquid ranges from 1 meter to 2 meters.

[0014] Optionally, the temperature range of the cooling liquid is 0°C to 15°C.

[0015] Optionally, the material of the pipeline includes stainless steel.

[0016] Optionally, the first predetermined temperature ranges from 18°C to 35°C.

[0017] Optionally, the second predetermined temperature ranges from 17°C to 20°C.

[0018] Optionally, there are multiple cleaning tanks.

[0019] Optionally, the photovoltaic module process device further includes:

[0020] A second holding tank is used to hold a first process liquid, wherein the first process liquid is used to soak the photovoltaic module;

[0021] The moving component is used to move the photovoltaic component after being soaked in the first process liquid into the cleaning tank.

[0022] Optionally, the first process liquid comprises hydrofluoric acid.

[0023] As another aspect of the embodiments of the present application, the embodiments of the present application also provide a photovoltaic module production line, including any one of the photovoltaic module process devices described above.

[0024] As another aspect of the embodiments of the present application, the embodiments of the present application further provide a photovoltaic cell, including a photovoltaic cell manufactured by the photovoltaic module process device described in any one of the above.

[0025] In the embodiment of the present application, the temperature of the cleaning liquid is changed from a first predetermined temperature to a second predetermined temperature by passing the cleaning liquid through a heat exchanger, and the photovoltaic modules are immersed in the cleaning liquid at the second predetermined temperature. This can effectively alleviate the problem of the appearance of flower basket marks / water marks on the photovoltaic modules further causing yield / rework loss due to the high temperature of the cleaning liquid in the cleaning tank.

[0026] The above summary 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 the present application will be readily apparent by reference to the accompanying drawings and the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In the accompanying drawings, unless otherwise specified, the same reference numerals throughout the multiple drawings represent the same or similar components or elements. These drawings are not necessarily drawn to scale. It should be understood that these drawings only depict some embodiments disclosed in this application and should not be construed as limiting the scope of this application.

[0028] Figure 1 A schematic structural diagram of a photovoltaic module process device according to an embodiment of the present application;

[0029] Figure 2 This is another structural schematic diagram of the photovoltaic module process device according to an embodiment of the present application.

[0030] Description of reference numerals:

[0031] 10. Pipeline; 30. Cleaning tank; 201. First holding tank; 202. Low-temperature pipeline; 205. Cooling liquid; 305. Cleaning liquid. DETAILED DESCRIPTION

[0032] Embodiments of the present application are described in detail below, with examples of the embodiments illustrated in the accompanying drawings. In the accompanying drawings, the sizes of layers, regions, and components, as well as their relative sizes, may be exaggerated for clarity. Throughout, the same or similar reference numerals represent the same or similar components or components having the same or similar functions. The embodiments described below with reference to the accompanying drawings are illustrative and intended only to explain the present application, and are not to be construed as limiting the present application.

[0033] It should be understood that when an element or layer is referred to as being "on," "adjacent to," "connected to," or "coupled to" another element or layer, it can be directly on, adjacent to, connected to, or coupled to the other element or layer, or there can be intervening elements or layers. Conversely, when an element is referred to as being "directly on," "directly adjacent to," "directly connected to," or "directly coupled to" another element or layer, there are no intervening elements or layers. It should be understood that while the terms first, second, third, etc. may be used to describe various elements, components, regions, layers, and / or parts, these elements, components, regions, layers, and / or parts should not be limited by these terms. These terms are merely used to distinguish one element, component, region, layer, or part from another. Thus, without departing from the teachings of the present disclosure, a first element, component, region, layer, or part discussed below may be represented as a second element, component, region, layer, or part. Furthermore, when a second element, component, region, layer, or part is discussed, it does not necessarily mean that the first element, component, region, layer, or part is present in the present disclosure.

[0034] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0035] The applicant has learned that during the alkaline polishing process, acid- and alkali-resistant baskets can be used to carry and clean silicon wafers. However, friction scratches may occur where the basket contacts the edge of the silicon wafer, causing wear of the silicon wafer's surface coating. When the silicon wafer is subsequently cleaned with a cleaning liquid, residual liquid precipitates from the surface of the silicon wafer. When the basket is removed from the cleaning liquid, the silicon wafer surface absorbs this residual liquid, resulting in a dirty basket mark / water mark.

[0036] The water temperature of the cleaning liquid is determined by the water supply. However, the temperature in low-latitude areas is relatively high, especially in summer, when the temperature of the water supply can exceed 25°C. If the silicon wafer coating is worn, the appearance of flower basket marks / water marks will further cause yield / rework losses.

[0037] Based on this, see Figure 1 , an embodiment of the present application provides a photovoltaic module process device, including a pipeline 10, a heat exchanger and a cleaning tank 30, which is described in detail below.

[0038] The pipeline 10 is used to receive the cleaning liquid 305 at a first predetermined temperature;

[0039] The heat exchanger wraps a portion of the pipe 10 and is used to change the temperature of the cleaning liquid 305 passing through the pipe 10 from a first predetermined temperature to a second predetermined temperature;

[0040] The cleaning tank 30 is in communication with the pipeline 10 and is used to receive and contain the cleaning liquid 305 having a second predetermined temperature outputted from the pipeline 10;

[0041] The cleaning liquid 305 having the second predetermined temperature is used to soak the photovoltaic components to be cleaned.

[0042] By passing the cleaning liquid 305 through a heat exchanger so that the temperature of the cleaning liquid 305 changes from a first predetermined temperature to a second predetermined temperature, the photovoltaic module is immersed in the cleaning liquid 305 at the second predetermined temperature. This can effectively alleviate the problem of the appearance of the basket marks / water marks on the photovoltaic module further causing yield / rework loss due to the high temperature of the cleaning liquid 305 in the cleaning tank 30.

[0043] Specifically, the photovoltaic module can be a silicon wafer, or a silicon wafer that has been processed through a certain process.

[0044] The cleaning liquid 305 can be deionized water (DI) or other liquids. Pure water can effectively clean the process liquid on the surface of the silicon wafer, improve the cleanliness of the silicon wafer surface, and also facilitate the preparation of the silicon wafer for subsequent processes.

[0045] In an optional embodiment, the heat exchanger may further include a first containing tank 201 , wherein the first containing tank 201 is configured to contain a cooling liquid 205 , wherein a portion of the pipe 10 is immersed in the cooling liquid 205 .

[0046] The cleaning liquid 305 at the first predetermined temperature flows through the pipe 10 immersed in the cooling liquid 205, and the cleaning liquid 305 exchanges heat with the cooling liquid 205. The cooling liquid 205 absorbs the heat of the cleaning liquid 305, the temperature of the cooling liquid 205 increases, and the temperature of the cleaning liquid 305 decreases.

[0047] The heat exchanger may also include a low-temperature pipeline 202, which is connected to the first holding tank 201 and is used to allow the cooling liquid 205 in the first holding tank 201 to flow along the low-temperature pipeline 202, so as to timely replace the cooling liquid 205 after heat exchange with the cleaning liquid 305, and ensure that the cooling liquid 205 in the first holding tank 201 has a sufficiently low temperature.

[0048] In other embodiments, the heat exchanger can also be a plate heat exchanger or a fin heat exchanger. A plate heat exchanger comprises multiple metal plates with channels formed between them. The cleaning liquid 305 and the cooling liquid 205 flow through adjacent channels for heat exchange. A fin heat exchanger comprises fins and tubes, with the cleaning liquid 305 flowing through the tubes and the cooling liquid 205 flowing across the fin surfaces for heat exchange.

[0049] In an optional embodiment, the length of the pipe 10 immersed in the cooling liquid 205 ranges from 1 meter to 2 meters.

[0050] The length of the pipe 10 immersed in the cooling liquid 205 is proportional to the heat exchange efficiency. To ensure that the cleaning liquid 305 reaches the second predetermined temperature after passing through the pipe 10, and considering cost considerations, the length of the pipe 10 is between 1 and 2 meters, preferably 2 meters. In other embodiments, the length of the pipe 10 can also be within other ranges, which can be adjusted based on the source temperature of the cleaning liquid 305, the room temperature, and other factors.

[0051] In an optional embodiment, the temperature range of the cooling liquid 205 is 0°C to 15°C.

[0052] The cooling liquid 205 in the above temperature range can quickly absorb the heat of the cleaning liquid 305 , thereby reducing the temperature of the cleaning liquid 305 .

[0053] The cooling liquid 205 may include water, which has a high thermal conductivity and specific heat capacity and can absorb a large amount of heat. In other embodiments, the cooling liquid 205 may also include salt water, ice water, liquid nitrogen, etc.

[0054] In an optional embodiment, the material of the pipe 10 includes stainless steel.

[0055] Stainless steel has a high thermal conductivity and can quickly transfer heat, thereby improving heat exchange efficiency. In addition, the surface of the stainless steel pipe 10 is smooth and not prone to scaling, which can maintain a good heat exchange effect.

[0056] In other embodiments, the material of the pipe 10 may also include aluminum, copper, or carbon steel.

[0057] In an optional embodiment, the first predetermined temperature ranges from 18°C to 35°C.

[0058] The source temperature of the cleaning liquid 305 is easily affected by the room temperature. The temperature of the cleaning liquid 305 received by the pipeline 10 is between 18°C and 35°C.

[0059] In an optional embodiment, the second predetermined temperature ranges from 17°C to 20°C.

[0060] The cleaning liquid 305 is cooled after passing through the heat exchanger, that is, the temperature of the cleaning liquid 305 output from the pipeline 10 is between 17°C and 20°C.

[0061] In an alternative embodiment, see Figure 2 There are multiple cleaning tanks 30. Each cleaning tank 30 is used to contain a cleaning liquid 305 at a second predetermined temperature for soaking and cleaning the photovoltaic modules. The pipeline 10 is connected to the multiple cleaning tanks 30 to simultaneously output the cleaning liquid 305 at the second predetermined temperature to the multiple cleaning tanks 30, ensuring the consistency of the cleaning liquid 305 within the multiple cleaning tanks 30.

[0062] The plurality of cleaning tanks 30 can simultaneously soak and clean a plurality of photovoltaic modules, thereby increasing the number of photovoltaic modules that can be processed simultaneously and improving production efficiency.

[0063] The photovoltaic module can be immersed in the cleaning liquid 305 for 5 seconds to 20 seconds, preferably 20 seconds.

[0064] In an optional embodiment, the photovoltaic module process device may further include:

[0065] A second holding tank is used to hold a first process liquid, wherein the first process liquid is used to soak the photovoltaic module;

[0066] The moving component is used to move the photovoltaic component after being soaked in the first process liquid into the cleaning tank 30.

[0067] Furthermore, in this embodiment, the first process liquid may include hydrofluoric acid.

[0068] The photovoltaic module may be a silicon wafer. The silicon wafer is polished by soaking it in hydrofluoric acid. In this embodiment, the concentration of the hydrofluoric acid may be 5% to 20%, the soaking time of the silicon wafer in the hydrofluoric acid may be 100 seconds to 120 seconds, and the soaking temperature may be 18° C. to 30° C.

[0069] The moving component can be a robotic arm. The silicon wafers are placed in the basket and immersed in the first process liquid. When the silicon wafers are completely immersed in the first process liquid, the robotic arm grabs the basket and lifts it out of the first process liquid to move the basket carrying the silicon wafers to the cleaning liquid 305 for cleaning.

[0070] When the cleaning liquid 305 cleans the silicon wafer, overflow water washing or bubbling can be used to improve the cleaning efficiency.

[0071] After the silicon wafers are cleaned, the flower basket is grabbed by a robotic arm and lifted out of the cleaning liquid 305 at a pulling rate of 3 mm to 7 mm per second.

[0072] In other embodiments, there may be multiple second receiving tanks, and the number of the second receiving tanks may be the same as the number of the cleaning tanks 30 .

[0073] In other embodiments, the photovoltaic module processing device may further include a third containing tank for containing a second process liquid, and the second process liquid is used to soak the photovoltaic module.

[0074] The photovoltaic module can be a silicon wafer. The second process liquid can be a NaOH solution. The NaOH solution is an alkaline solution. The photovoltaic module is immersed in the NaOH solution. The alkaline NaOH solution reacts with the oxide layer on the surface of the silicon wafer to form soluble silicate, thereby removing the oxide layer and defects on the silicon wafer surface.

[0075] In other embodiments, the alkaline solution may further include KOH, NH4OH, etc.

[0076] An embodiment of the present application also provides a photovoltaic module production line, comprising the photovoltaic module process device described in any of the above embodiments.

[0077] Specifically, a photovoltaic module production line may include multiple cleaning tanks and drying assemblies for alkaline polishing of photovoltaic modules. The drying assemblies are used to blow hot air at 80°C to 110°C to dry residual liquid on the surface of the photovoltaic modules, which may be silicon wafers.

[0078] The specific processing process may include:

[0079] Pre-cleaning → pure water cleaning → alkaline polishing → pure water cleaning → post-cleaning (or ozone cleaning) → pure water cleaning → acid cleaning → pure water cleaning → drying.

[0080] Based on the same inventive concept, an embodiment of the present application further provides a photovoltaic cell, including a photovoltaic cell manufactured by the photovoltaic module process device in any of the above embodiments.

[0081] In this embodiment, photovoltaic cells can be electrically connected in whole or multiple sections to form multiple cell strings. Multiple cell strings can be electrically connected in series and / or in parallel to form a more flexible battery structure. To protect the cell strings, the photovoltaic module may also include an encapsulation layer and a cover plate. The encapsulation layer may cover the surface of the cell string, and the cover plate may cover the surface of the encapsulation layer away from the cell string.

[0082] In some embodiments, multiple battery strings can be electrically connected via conductive tape to achieve a series or parallel arrangement of cells. The encapsulation layer can be made of an organic encapsulation film, such as an ethylene-vinyl acetate copolymer film, a polyethylene octene copolymer film, or a polyethylene terephthalate film, to provide protection and isolation.

[0083] The cover plate can be made of a light-transmitting material, such as a glass cover plate or a plastic cover plate, to ensure that light can enter the battery string while providing protection for the battery.

[0084] The photovoltaic module process equipment, photovoltaic module production line, and other components of the photovoltaic cells in the above-mentioned embodiments may adopt various technical solutions known to ordinary technicians in this field now and in the future, and will not be described in detail here.

[0085] The disclosure above provides many different embodiments or examples for realizing different structures of the present application. In order to simplify the disclosure of the present application, the components and settings of specific examples are described above. Of course, they are merely examples and are not intended to limit the present application. In addition, the present application may repeat reference numbers and / or reference letters in different examples. Such repetition is for the purpose of simplicity and clarity and does not in itself indicate the relationship between the various embodiments and / or settings discussed.

[0086] Although the embodiments of the present application have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions, and variations may be made to the embodiments without departing from the principles and intent of the present application, and that the scope of the present application is defined by the claims and their equivalents.

Claims

1. A photovoltaic module process device, characterized in that: include: a conduit for receiving a cleaning liquid at a first predetermined temperature; a heat exchanger, wrapping a portion of the pipe, for changing the temperature of the cleaning liquid passing through the pipe from a first predetermined temperature to a second predetermined temperature; a cleaning tank, communicated with the pipeline, for receiving and accommodating the cleaning liquid having a second predetermined temperature outputted from the pipeline; Wherein, the cleaning liquid with the second predetermined temperature is used to soak the photovoltaic components to be cleaned.

2. The photovoltaic module process device according to claim 1, characterized in that: The heat exchanger includes a first containing tank, wherein the first containing tank is used to contain cooling liquid; Part of the pipe is immersed in the cooling liquid.

3. The photovoltaic module process device according to claim 2, characterized in that: The length of the pipe immersed in the cooling liquid ranges from 1 meter to 2 meters.

4. The photovoltaic module process device according to claim 2, characterized in that: The heat exchanger further includes a low-temperature pipeline, which is communicated with the first containing tank and is used to allow the cooling liquid in the first containing tank to flow along the low-temperature pipeline.

5. The photovoltaic module process device according to claim 2, characterized in that: The material of the pipe includes stainless steel.

6. The photovoltaic module process device according to claim 1, characterized in that: There are multiple cleaning tanks.

7. The photovoltaic module process device according to claim 1, characterized in that: The photovoltaic module process device further includes: A second holding tank is used to hold a first process liquid, wherein the first process liquid is used to soak the photovoltaic module; The moving component is used to move the photovoltaic component after being soaked in the first process liquid into the cleaning tank.

8. The photovoltaic module process device according to claim 7, characterized in that: There are multiple second receiving grooves.

9. The photovoltaic module process device according to claim 7, characterized in that: The first process liquid includes hydrofluoric acid.

10. A photovoltaic module production line, characterized in that: The photovoltaic module production line includes the photovoltaic module process device according to any one of claims 1 to 9.

11. A photovoltaic cell, characterized in that: A photovoltaic cell manufactured using the photovoltaic module process device according to any one of claims 1 to 9.

Images