Photovoltaic cell string overfiring prevention device

Abstract

The application relates to a photovoltaic cell string anti-overwelding device, which comprises a heating device and an air cooling device. The heating device is used for heating solder on a photovoltaic cell string to a melting point, and the heating device is driven to approach or move away from the photovoltaic cell string through a driving mechanism. In the case that the temperature of welding is too high or the cell string stays in a welding station for too long, the welding device can be separated from the photovoltaic cell string, and the overwelding phenomenon in welding is avoided. The air cooling device comprises a plurality of air holes, and air flows from the air holes to the photovoltaic cell string. The heating device heats the photovoltaic cell string, and the air flow of the air cooling device blows to the photovoltaic cell string at the same time, so that the temperature of the photovoltaic cell string is controlled in a preset temperature zone. Through the cell string anti-overwelding device designed in the application, the overwelding phenomenon in the welding of the cell string is effectively reduced, and the yield of welding is improved.

Description

Technical Field

[0001] This application relates to the field of photovoltaic cell manufacturing technology, and in particular to a photovoltaic cell string anti-over-soldering device. Background Technology

[0002] With the continuous advancement and innovation of photovoltaic production technology, welding technology is also constantly evolving to meet increasingly stringent quality standards and production demands. In existing technologies, cooling for photovoltaic cell welding is typically performed after welding is complete. After the cells have cooled, they carry the heat generated during welding and are transferred to the next cooling station. Fans are used to blow air, thus lowering the cell temperature – this is post-weld cooling. However, existing technologies lack effective solutions to address over-welding phenomena that occur during welding. Furthermore, slow production cycles leading to prolonged cell dwell in the welding area and excessively high temperatures at the welding station also have few solutions. Therefore, there is an urgent need for a photovoltaic cell string production device that can achieve cooling and temperature reduction during the welding process. Utility Model Content

[0003] The purpose of this application is to provide a photovoltaic cell string anti-oversoldering device, including a heating device for heating the solder on the photovoltaic cell string to its melting point; the heating device is connected to a first driving mechanism, which can drive the heating device to move closer to or away from the photovoltaic cell string.

[0004] Preferably, the heating device includes a heating element and a heating plate, the first driving mechanism is connected to one side of the heating plate, and the side of the heating plate opposite to the driving mechanism is configured to be located near or in contact with the heating surface of the photovoltaic cell string.

[0005] Preferably, the photovoltaic cell string anti-over-welding device further includes a conveying mechanism, on which the photovoltaic cell string is placed and conveyed along a preset conveying path to a heating station for heating.

[0006] Preferably, an air-cooling device is also provided on one side of the conveying mechanism. The air-cooling device includes multiple air holes, and airflow is blown from the air holes toward the photovoltaic cell string. While the heating device heats the photovoltaic cell string, the airflow from the air-cooling device blows toward the photovoltaic cell string, controlling the temperature of the photovoltaic cell string within a preset temperature range.

[0007] Preferably, a pressure plate is also provided between the air-cooling device and the photovoltaic cell string. The pressure plate is provided with multiple hollow airflow channels, and the airflow is blown from the air holes through the airflow channels to the photovoltaic cell string.

[0008] Preferably, the heating device is located at the heating station in the conveying path. After the heating device heats the photovoltaic cell string to a specified temperature range, the driving mechanism drives the heating device to move away from the photovoltaic cell string.

[0009] Preferably, the air-cooling device is configured as a cooling plate, and an air passage is provided in the cooling plate, through which airflow is blown from the multiple air holes onto the surface of the photovoltaic cell string.

[0010] Preferably, a second driving mechanism is also provided on one side of the conveying mechanism. The second driving mechanism carries the pressure plate and places it on the conveying mechanism. The pressure plate is then carried by the conveying mechanism to the heating station.

[0011] Preferably, the second driving mechanism is provided with a magnetic attraction element, which can attract the pressure plate.

[0012] Compared with the prior art, the advantages of this application are:

[0013] (1) This application has set up an anti-over-welding device during the welding process of photovoltaic cells or cell strings. If the welding temperature is too high or the cell string stays at the welding station for too long, the heating device can be removed from the photovoltaic cell string to avoid over-welding during the welding process.

[0014] (2) This application designs a heating welding device and a wind-cooling heat dissipation device at the work station for welding photovoltaic cells or cell strings. During the heating welding process of photovoltaic cell strings, wind-cooling heat dissipation can be carried out at the same time, ensuring the yield of cell welding.

[0015] (3) The heating device and the air cooling device are respectively set on both sides of the photovoltaic cell string, which makes it easier to dissipate heat during the photovoltaic cell string welding process.

[0016] (4) Multiple strip-shaped hollow heat dissipation channels are set on the pressure plate. While ensuring that pressure is applied to the photovoltaic cell string, airflow can be evenly applied to the surface of the photovoltaic cell string from the air holes to achieve efficient heat dissipation. Attached Figure Description

[0017] The present application will be further described below with reference to the accompanying drawings and embodiments:

[0018] Figure 1 This is a schematic diagram of the overall structure of a photovoltaic cell string anti-over-soldering device according to this application;

[0019] Figure 2 This is a schematic diagram of the heating device for an anti-over-soldering device for photovoltaic cell strings according to this application;

[0020] Figure 3 This is a schematic diagram of the heating device for an anti-over-soldering device for photovoltaic cell strings according to this application;

[0021] Figure 4 This is a schematic diagram of the air-cooling device for an anti-over-soldering device for photovoltaic cell strings according to this application;

[0022] Figure 5 This is a schematic diagram of the pressure plate of a photovoltaic cell string anti-over-soldering device according to this application;

[0023] Figure 6 This is a schematic diagram of the overall structure of a photovoltaic cell string anti-over-soldering device according to this application;

[0024] Figure 7 This is a schematic diagram of the welding process for a photovoltaic cell string anti-over-welding device according to this application;

[0025] in:

[0026] 1. Heating device; 11. Heating element; 12. Heating plate; 13. First driving mechanism;

[0027] 2. Air-cooled device, 21 air vents;

[0028] 3. Photovoltaic cell strings;

[0029] 4. Pressure plate; 41. Airflow channel;

[0030] 5. Conveying mechanism;

[0031] 6. Second drive mechanism; 61. Magnetic attraction element; 62. Three-axis moving module. Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of this application clearer, the embodiments of this application will be described in further detail below with reference to the accompanying drawings. Obviously, the described embodiments are merely one embodiment of this application, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0033] The term "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of this application. In the description of the embodiments of this application, it should be understood that the terms "first," "second," and "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first," "second," and "third," etc., may explicitly or implicitly include one or more of that feature. Furthermore, the terms "first," "second," and "third," etc., are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in orders other than those illustrated or described herein. Moreover, the terms "comprising" and "being," and any variations thereof, are intended to cover non-exclusive inclusion.

[0034] like Figure 1 As shown, this embodiment provides a photovoltaic cell string anti-over-soldering device, including a heating device 1, an air-cooling device 2, a photovoltaic cell string 3, a pressure plate 4, and a conveying mechanism 5. The conveying mechanism 5 is used for feeding the photovoltaic cell string 3. To improve the production efficiency of photovoltaic cells, the photovoltaic cell string 3 is usually composed of multiple cells, fed in groups of three or five. In this embodiment, the photovoltaic cell string is used as an example. The conveying mechanism 5 transports the photovoltaic cell string 3 to the next station along the first direction, i.e., the horizontal direction. To achieve welding of the photovoltaic cell string 3, in this embodiment, a heating device 1 is provided in the conveying direction of the conveying mechanism 5. The heating device 1 can heat the photovoltaic cell string 3 at the heating station and heat the solder attached to the photovoltaic cell string 3 to its melting point to achieve welding. During the welding process, over-soldering may occur due to some production and processing reasons, thereby damaging the photovoltaic cell string 3. In this embodiment, an air-cooling device 2 is provided on one side of the conveying mechanism 5 for air cooling of the photovoltaic cell string 3 at the heating station. During the heating and welding process, the battery cells need to be pressed down in order to achieve a better welding effect. Therefore, a pressure plate 4 is designed in this embodiment to press the battery cells 3 for welding. At the same time, the air cooling device 2 blows air onto the surface of the battery cells 3 through the pressure plate 4 to complete the cooling during the heating and welding process.

[0035] like Figure 2-3As shown, the photovoltaic cell string 3 is conveyed horizontally to the heating station. At the heating station, the heating device 1 is located below. The heating device 1 includes a heating element 11 and a heating plate 12. The photovoltaic cell string 3 is placed on the heating plate 12. In this embodiment, the heating element 11 can be an infrared heater, an electric heater, or other products capable of heating. Since solder, usually solder paste, is attached to the photovoltaic cell string 3, the heating element 11 has the ability to heat the solder paste to its melting point. The heating plate 12 is located outside the heating element 11. In order to better heat the photovoltaic cell string 3, in this embodiment, a pressure plate 4 is pressed on the surface of the photovoltaic cell string 3, which increases the contact area between the photovoltaic cell string 3 and the heating plate 12 and improves the welding efficiency. In this embodiment, the photovoltaic cell string 3 is usually a cell, so the surface of the heating plate 12 that contacts the cell is also configured as a smooth contact surface.

[0036] A first driving mechanism 13 is also provided on the heating device 1. The first driving mechanism 13 can drive the heating element 11 and the heating plate 12 to approach or move away from the photovoltaic cell string 3. In this embodiment, the first driving mechanism 13 can be a power mechanism such as a cylinder or a motor for driving. The first driving mechanism is connected to one side of the heating plate 12. The side of the heating plate 12 opposite to the driving mechanism is configured to be located near or in contact with the heating surface of the photovoltaic cell string 3. During the welding process, there is usually an over-welding phenomenon caused by excessively high welding temperature. In this embodiment, when the welding temperature is detected to exceed the preset temperature range, the first driving mechanism 13 can... The first drive mechanism 13 can drive the heating element 11 and the heating plate 12 to detach from the photovoltaic cell string 3, reducing the occurrence of over-soldering. At the same time, the air-cooling device 2 can also cool the photovoltaic cell string 3. In addition to over-soldering caused by excessive temperature, there is also the problem of excessive heat accumulation at the welding station caused by the slow production cycle causing the cells to stay in the welding area for a long time. At this time, the first drive mechanism 13 can drive the heating element 11 and the heating plate 12 to detach from the photovoltaic cell string 3 to avoid over-soldering. The air-cooling device 2 can also cool the photovoltaic cell string 3. In this example, in order to accurately know the welding temperature, a temperature measuring device can be set at the heating station. The temperature measuring device is existing technology and will not be described in detail here.

[0037] like Figure 4-5As shown, the air-cooling device 2 is configured as a cooling plate with multiple air holes 21. An air passage connecting the air holes 21 is provided inside the cooling plate. Airflow passes through the air passage and exits from the air holes 21, blowing towards the photovoltaic cell string 3. Since a pressure plate 4 is also provided between the air-cooling device 2 and the photovoltaic cell string 3, in order to better dissipate heat from the photovoltaic cell string 3, in this example, multiple perforated airflow channels 41 are provided on the pressure plate 4. Airflow can exit from the air holes and exit from the airflow channels 41 towards the photovoltaic cell string 3. In some embodiments of this application, the shape of the pressure plate 4 matches the shape design of the photovoltaic cell string 3. When the shape of the photovoltaic cell string 3 is rectangular, the overall shape of the pressure plate 4 is also configured as rectangular. In this case, the airflow channels 41 are configured as regularly arranged strips along the width direction of the pressure plate 4. The outer side of the several regularly arranged strip airflow channels 41 forms the outer frame of the pressure plate 4. The outer frame of the pressure plate 4 can press against the surface of the photovoltaic cell string 3, and the airflow channels inside the outer frame can dissipate heat from the photovoltaic cell string 3.

[0038] like Figure 6 As shown, in order to realize the handling and loading of the pressure plate, this embodiment also provides a second drive mechanism 6 on one side of the conveying mechanism 5, including a three-axis moving module 62 fixed on the machine base. The three-axis moving module usually has movement in three directions: X, Y, and Z. A magnetic element 61 is provided below the three-axis moving module 62 to attract the pressure plate 4 and realize the loading of the pressure plate 4. In this embodiment, the pressure plate 4 is made of iron or stainless steel, and the magnetic element 61 is an electromagnet. The three-axis moving module 62 drives the magnetic element 61 to attract the pressure plate 4 from the loading station of the pressure plate 4 by magnetic attraction, and then place it on the photovoltaic cell string 3 to complete the loading of the pressure plate 4. In this embodiment, the second drive mechanism 6 is set at the station before the heating station. After the pressure plate 4 is loaded, the conveying mechanism 5 drives the pressure plate 4 and the photovoltaic cell string 3 to be transported together to the heating station for heating and welding.

[0039] In some other embodiments of this application, a wind-cooling device drive mechanism 7 is also provided on one side of the heating station. The wind-cooling device drive mechanism 7 is mounted on the frame and can move in the vertical direction to drive the cooling plate of the wind-cooling device 2 to move closer to or away from the pressure plate 4.

[0040] like Figure 7As shown, the production process of the photovoltaic cell string anti-over-soldering device in this embodiment includes placing a photovoltaic cell string 3 on a conveying mechanism 5. The photovoltaic cell string 3 is a combination of cell cells and solder strips. The second drive mechanism 6 transports the pressure plate 4 onto the photovoltaic cell string 3. Subsequently, the photovoltaic cell string 3 is transported to the next station. The heating device 1 heats up the grid to melt the solder, thereby achieving the welding of the photovoltaic cell string 3. At this time, if over-soldering occurs and causes the temperature of the photovoltaic cell string 3 to rise, the first drive mechanism 13 can drive the heating device 1 to detach from the photovoltaic cell string 3 to prevent the temperature of the photovoltaic cell string 3 from rising further. The air cooling device 2 can also blow airflow onto the photovoltaic cell string 3 for air cooling and heat dissipation, ensuring that the photovoltaic cell string 3 is in a reasonable temperature range.

[0041] The above embodiments are merely illustrative of the technical concept and features of this application, intended to enable those skilled in the art to understand the content of this application and implement it accordingly, and should not be construed as limiting the scope of protection of this application. It is obvious to those skilled in the art that this application is not limited to the details of the above exemplary embodiments, and that this application can be implemented in other specific forms without departing from the spirit or essential characteristics of this application. Therefore, the embodiments should be considered exemplary and non-limiting in all respects. The scope of this application is defined by the appended claims rather than the foregoing description, and thus all variations falling within the meaning and scope of the equivalents of the claims are intended to be included within this application.

Claims

1. A photovoltaic cell string anti-over-soldering device, characterized in that, include: Heating device (1) is used to heat the solder on the photovoltaic cell or photovoltaic cell string (3) to the melting point; The heating device (1) is connected to a first driving mechanism, which can drive the heating device (1) to move closer to or away from the battery cell or photovoltaic cell string (3).

2. The photovoltaic cell string anti-over-soldering device according to claim 1, characterized in that, The heating device (1) includes a heating element (11) and a heating plate (12). The first driving mechanism is connected to one side of the heating plate (12). The side of the heating plate (12) opposite to the driving mechanism is configured to be located near or in contact with the heating surface of the photovoltaic cell or battery string (3).

3. The photovoltaic cell string anti-over-soldering device according to claim 2, characterized in that, The photovoltaic cell string anti-over-welding device also includes a conveying mechanism (5), on which the photovoltaic cell string (3) is placed and conveyed along a preset conveying path to the heating station for heating.

4. A photovoltaic cell string anti-over-soldering device according to claim 3, characterized in that, A cooling device (2) is also provided on one side of the conveying mechanism (5). The cooling device (2) includes multiple air holes (21). Airflow blows from the air holes (21) onto the battery cell or photovoltaic cell string (3). While the heating device (1) heats the battery cell or photovoltaic cell string (3), the airflow from the cooling device (2) blows onto the photovoltaic cell or cell string (3), controlling the temperature of the battery cell or photovoltaic cell string (3) within a preset temperature range.

5. A photovoltaic cell string anti-over-soldering device according to claim 4, characterized in that, A pressure plate (4) is also provided between the air-cooling device (2) and the solar cell or photovoltaic cell string (3). The pressure plate (4) is provided with multiple hollow airflow channels (41). The airflow is blown from the air hole (21) through the airflow channels (41) to the solar cell or photovoltaic cell string (3).

6. A photovoltaic cell string anti-over-soldering device according to claim 5, characterized in that, The heating device (1) is located at the heating station in the conveying path. After the heating device (1) heats the battery cell or photovoltaic cell string (3) to the specified temperature range, the driving mechanism drives the heating device (1) to move away from the battery cell or photovoltaic cell string (3).

7. A photovoltaic cell string anti-over-soldering device according to claim 4, characterized in that, The air-cooling device (2) is configured as a cooling plate, and an air passage is provided in the cooling plate. The airflow passes through the air passage and blows from the multiple air holes (21) onto the surface of the photovoltaic cell or cell string (3).

8. A photovoltaic cell string anti-over-soldering device according to claim 5, characterized in that, A second drive mechanism (6) is also provided on one side of the conveying mechanism (5). The second drive mechanism (6) transports the pressure plate (4) and places it on the conveying mechanism (5). The pressure plate (4) is transported to the heating station by the conveying mechanism (5).

9. A photovoltaic cell string anti-over-soldering device according to claim 8, characterized in that, The second drive mechanism (6) is provided with a magnetic element (61), which can attract the pressure plate (4).

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