Solder strip pressing device and series welding machine

Abstract

The utility model provides a welding strip pressing device and a series welding machine. The welding strip pressing device comprises a frame, a pressing needle assembly and at least one frame fixing piece. The frame comprises a pressing part and at least one fixing part; pressing needle mounting holes are formed in the pressing part, the pressing needle mounting holes are distributed in the pressing part in an array mode, and one pressing needle assembly is mounted in each pressing needle mounting hole; the pressing needle assembly is used for pressing the welding strip when the solar cell is welded; the at least one frame fixing piece is connected with at least one end of the frame through a fixing part and used for positioning the frame; and the pressing part is made of a high-temperature-resistant transparent hard material. The welding strip pressing device is high in structural strength, stable in structure, simple in structure, low in machining difficulty, capable of avoiding deviation of the welding strip during use, high in operation quality and free of light shielding, and the welding strip does not deviate in the welding process of the series welding machine, and the welding line quality is high.

Description

Technical Field

[0001] This application relates to the field of battery manufacturing technology, specifically to a welding strip pressing device and a string welding machine. Background Technology

[0002] Optical light boxes include optical drying light boxes and optical curing light boxes. Optical drying light boxes remove moisture and humidity from the surface of products such as optical components or battery components by heating and blowing air.

[0003] Welding strip clamping fixtures are used to clamp the welding strip during the welding process of optical components or battery components. This achieves positioning and clamping of the welding strip, prevents deformation, and provides a stable welding environment, thereby ensuring the quality of the weld. When using existing welding strip clamping fixtures to clamp the welding strip and then drying it in an optical drying chamber, welding strip misalignment often occurs, leading to poor weld quality and consequently affecting product quality. Utility Model Content

[0004] This application addresses the problems existing in the prior art by providing a welding strip clamping device that has high structural strength and stability, avoids welding strip deviation, produces high-quality work, does not block light, has a simple structure, and is easy to process. It also provides a serial welding machine that prevents welding strip deviation and produces high-quality welds during the welding process.

[0005] To achieve the above objectives, the technical solution adopted in this application is as follows: a welding strip pressing device, comprising a frame, a pressing needle assembly and at least one frame fixing member;

[0006] The frame includes a clamping part and at least one fixing part; the clamping part has pin mounting holes, which are arranged in an array on the clamping part, and one pin assembly is installed in each pin mounting hole; the pin assembly is used to clamp the solder strip during solar cell welding;

[0007] At least one of the frame fasteners is connected to at least one end of the frame via the fastening part, and the frame fastener is used to position the frame;

[0008] The clamping part is made of a high-temperature resistant, transparent, hard material.

[0009] In some embodiments, the heat resistance temperature of the clamping part is not lower than 800°C.

[0010] In some embodiments, the clamping part is made of quartz glass.

[0011] In some embodiments, the clamping part includes a first horizontal frame and a reinforcing rib group; the number of the first horizontal frames is at least two, the number of the pressure pin mounting holes includes at least two columns, and each of the first horizontal frames is provided with one column of pressure pin mounting holes; a reinforcing rib group is provided between each of two adjacent first horizontal frames.

[0012] In some embodiments, the first horizontal frame is strip-shaped and has the same width.

[0013] In some embodiments, the diameter of the pressure pin mounting hole is smaller than the width of the first cross frame.

[0014] In some embodiments, the at least two first horizontal frames are parallel to each other and equally spaced.

[0015] In some embodiments, the reinforcing rib group includes at least two reinforcing ribs connected between two adjacent first cross frames.

[0016] In some embodiments, the pressure needle assembly includes a first pressure needle and a clamping spring, the first pressure needle passing through a corresponding pressure needle mounting hole, and the clamping spring being disposed between the first pressure needle and the frame.

[0017] A string welding machine includes a light box, at least two ribbon clamping devices, and a conveyor belt; the conveyor belt is used to transport solar cells; when the light box is used to weld the solar cells transported by the conveyor belt, the at least two ribbon clamping devices are arranged linearly along the transport direction of the conveyor belt; the ribbon clamping devices are the ribbon clamping devices described in any embodiment.

[0018] Compared with the prior art, this application has the following advantages:

[0019] This application uses a high-temperature resistant transparent rigid material to make the frame, which is more stable under the same working conditions than an aluminum frame. This avoids expansion and deformation at high temperatures during drying operations, thereby avoiding or reducing the risk of weld strip misalignment and ensuring the quality of the operation.

[0020] This application uses a high-temperature resistant transparent rigid material to make the frame. The strength can be guaranteed by setting a wider strip-shaped first horizontal frame. At the same time, the simplified shape reduces the processing difficulty. Furthermore, by setting reinforcing ribs at arbitrary intervals, the structural strength of the frame can be further guaranteed without blocking ultraviolet and infrared rays, thereby ensuring the operational stability of the welding clamping fixture and guaranteeing the quality of the operation. Attached Figure Description

[0021] Figure 1 This is a top view of the welding strip clamping device of this application;

[0022] Figure 2This is a front view of the welding strip clamping device of this application;

[0023] Figure 3 for Figure 1 A schematic diagram of the structure cut along the middle AA section;

[0024] Figure 4 for Figure 3 A magnified schematic diagram of the structure at point B in the middle;

[0025] Figure 5 This is a schematic diagram of the framework in this application;

[0026] Figure 6 This is a schematic diagram of the structure of the first pressure needle in this application;

[0027] Figure 7 This is a schematic diagram of a welding clamping fixture that includes an aluminum frame in the prior art;

[0028] Figure 8 This is a schematic diagram of the structure of the string welding machine in use in this application.

[0029] The reference numerals in the attached drawings are as follows: 100, frame; 101, first horizontal frame; 102, through hole; 103, reinforcing rib; 104, pressure needle mounting hole; 105, retaining ring; 110, pressing part; 120, fixing part; 200, pressure needle assembly; 201, first pressure needle; 2011, rod body; 2012, sleeve part; 2013, baffle; 2014, buckle groove; 202, compression spring; 203, buckle ring; 300, frame fixing part; 400, solar cell; 501, second horizontal frame; 502, second pressure needle; 503, light-transmitting hole; 504, main reinforcing rib; 505, auxiliary reinforcing rib; 506, thickened part; 600, conveyor belt. Detailed Implementation

[0030] In this application, to clearly illustrate the technical features of the solution, the implementation methods of this application will be described in detail below with reference to the accompanying drawings and embodiments. This will allow for a full understanding and implementation of how this application uses technical means to solve technical problems and achieve corresponding technical effects. The embodiments of this application and the various features within them can be combined with each other without conflict, and the resulting technical solutions are all within the protection scope of this application.

[0031] In embodiments of this application, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0032] Optical curing and drying light boxes mainly include UV-LED light boxes and infrared drying light boxes. UV-LED refers to a technology that uses ultraviolet LED light sources as radiation sources to cure UV (ultraviolet light curing) materials. Optical drying light boxes remove moisture and humidity from the surface of products such as optical components or battery components through heating and air blowing. When existing solder ribbon clamping devices are also used in infrared drying ovens, solder ribbon misalignment often occurs during operation—that is, when the solder ribbon clamping fixture clamps the solder ribbon and the drying process takes place in the optical drying light box. To solve this problem, the inventors, through numerous experiments and observations, discovered that during the drying process, the infrared lamps in the optical drying light box reach a relatively high temperature. This heat is transferred to the existing aluminum frame, causing it to expand and deform, thus leading to solder ribbon misalignment.

[0033] See Figure 1 , 2 In order to solve the problem of weld strip displacement caused by thermal expansion deformation of aluminum frame, this application provides a weld strip clamping device, including frame 100, pressure pin assembly 200 and at least one frame fastener 300.

[0034] The frame 100 includes a clamping part 110 and at least one fixing part 120; the clamping part 110 has pin mounting holes 104, the pin mounting holes 104 are arranged in an array in the clamping part 110, and a pin assembly 200 is installed in each pin mounting hole 104; the pin assembly 200 is used to clamp the solder strip during solar cell welding;

[0035] At least one frame fastener 300 is connected to at least one end of the frame 100 via a fixing part 120. The frame fastener 300 is used to position the frame 100. In use, the frame fastener 300 is used to connect and fix the frame 100, and to perform positioning operations such as transmission, positioning, guiding, and handling of the frame 100. Further, see Figure 1 , 2There are two frame fasteners 300, which are symmetrically connected at both ends of the frame 100. Correspondingly, the frame 100 includes two fixing parts 120, each of which is connected to one frame fastener 300. The two frame fasteners 300 symmetrically connected at both ends of the frame 100 can ensure the stability of the frame 100 during use, thereby ensuring the quality of the operation.

[0036] The clamping part 110 is made of high-temperature resistant transparent rigid material. High-temperature resistant transparent rigid material has good high-temperature resistance. Under the same working conditions, the frame 100 made of high-temperature resistant transparent rigid material is more stable than the aluminum frame structure, avoiding expansion and deformation, thereby avoiding or reducing the risk of weld strip displacement and ensuring work quality. Furthermore, the frame 100 is made of high-temperature resistant transparent rigid material, and the overall material of the frame 100 is consistent, which is convenient for manufacturing and simplifies the connection.

[0037] Preferably, the heat resistance temperature of the high-temperature resistant transparent rigid material is not lower than 300℃. During solar cell welding, the temperature is usually controlled between 230℃ and 260℃, below 300℃. During the welding stage, infrared radiation heats the cell and the welding strip to make them reach the melting point and form a good weld joint. The selection of welding temperature needs to ensure that the solder can fully melt and form a good metallurgical bond with the cell, while avoiding excessive temperature that could damage the cell. The welding strip clamping device, as a clamping tool during solar cell welding, needs to have a heat resistance temperature greater than the highest temperature during welding to ensure the stability of the frame 100.

[0038] In some embodiments, the heat resistance temperature of the clamping part is not lower than 800°C, and the higher the heat resistance temperature of the high-temperature resistant transparent rigid material, the better it can ensure excellent thermal expansion stability under operating conditions below 300°C.

[0039] In some embodiments, the clamping part 110 is made of quartz glass. Quartz glass has good light transmittance and high heat resistance, with a normal operating temperature of 1100℃~1200℃ and a short-term operating temperature of up to 1400℃. The linear expansion coefficient of quartz glass is 0.5×10-6 / ℃. Under the same working conditions, the expansion deformation of aluminum is 46 times that of quartz glass. The frame 100 made of quartz glass has a more stable structure. The hardness of quartz glass can reach Mohs scale 7, which can ensure the structural and service strength of the frame 100. Furthermore, the frame 100 is made entirely of quartz glass, and the uniform material of the entire frame 100 facilitates manufacturing and simplifies connections.

[0040] Besides the issue of weld strip misalignment, uneven drying is also a common problem when the weld strip is clamped by the welding strip clamping fixture and dried in the optical drying light box, which in turn affects the quality of the weld or product after drying. In addition, optical light boxes also include UV-LED light boxes. UV-LED refers to a technology that uses ultraviolet LED light sources as radiation sources to achieve UV (ultraviolet curing) material curing. The working principle of UV-LED light boxes is to use ultraviolet light irradiation to trigger a photochemical reaction, thereby quickly curing UV adhesives, inks, or coatings. However, the welding strip clamping fixture clamps the weld strip tightly, and poor curing results occur during UV curing. Through experiments, operators found that the above-mentioned problems of uneven drying and poor UV curing results are all caused by the aluminum frame blocking infrared or ultraviolet light.

[0041] See Figure 7 The existing welding and clamping fixture for optical curing and drying light boxes uses an aluminum frame. The aluminum frame needs to have large light-transmitting holes to allow UV or infrared light to pass through, while also facilitating moisture and humidity evaporation. The aluminum frame includes several parallel second horizontal frames 501. Between adjacent second horizontal frames 501, there are light-transmitting holes 503 with the largest possible area. To reduce the obstruction of UV or infrared light by the second horizontal frames 501, the width of the second horizontal frame 501 is smaller than the outer diameter of the second pressure pin 502 rod. That is, to minimize UV ​​or infrared light obstruction, the second horizontal frame 501 needs to be as thin as possible. The positions on the second horizontal frame 501 where the second pressure pin 502 is located are thickened. Part 506: To prevent deformation of the second horizontal frame 501 during use, a main reinforcing rib 504 is provided between the middle of adjacent second horizontal frames 501 to ensure the structural strength of the aluminum frame. If the length of the two sides of the main reinforcing rib 504 is long, auxiliary reinforcing ribs 505 are considered to be added to further ensure the structural strength of the aluminum frame. Even if the width of the second horizontal frame 501 is smaller than the outer diameter of the second pressure pin 502 rod and the setting of reinforcing ribs is minimized, there are still many obstructions in the aluminum frame, which affects the curing or drying effect. Further reducing the width of the second horizontal frame 501 will reduce the structural strength of the aluminum frame. Therefore, at present, it is impossible to balance structural strength and light transmission effect when using aluminum frames.

[0042] In the welding strip clamping device provided in this application, the clamping part 110 in the frame 100 is made of a high-temperature resistant transparent hard material. Whether applied to drying or UV curing operations, it will not block infrared or ultraviolet light. Moreover, the clamping part 110 made of high-temperature resistant transparent hard material has high structural strength, while taking into account both structural strength and light transmission. When the welding strip clamping device of this application is used for drying operations, the drying is uniform and the quality of the weld or product is stable. Furthermore, when the welding strip clamping device of this application is used for UV curing, the curing effect is good.

[0043] In some embodiments, the clamping part 110 includes a first horizontal frame 101 and a reinforcing rib assembly; the number of first horizontal frames 101 is at least two, and the pressure pin mounting holes 104 include at least two rows, with one row of pressure pin mounting holes 104 provided on each first horizontal frame 101. Preferably, see [reference needed]. Figure 5 In the array of pressure pin mounting holes 104, the direction perpendicular to the first horizontal frame 101 is... Figure 5 The vertical direction is the row, parallel to the direction of the first horizontal frame 101. Figure 5 The frame is arranged in horizontal columns; a reinforcing rib is set between each two adjacent first horizontal frames 101. Since the high-temperature resistant transparent rigid material used in the frame 100 does not block ultraviolet or infrared rays, the combination of the reinforcing ribs made of high-temperature resistant transparent rigid material and the first horizontal frames 101 can simplify the structure of the frame 100 while ensuring its structural strength. Because the high-temperature resistant transparent rigid material has good light transmittance and does not block ultraviolet or infrared rays, it ensures that the UV adhesive is fully cured during the curing process, increases the tension between the welding strip and the battery cell, and ensures that infrared rays directly irradiate during the infrared drying process, thus ensuring the uniformity of drying and further improving the drying effect.

[0044] The interval between two adjacent first horizontal frames 101 is a through hole 102, which facilitates the evaporation of moisture and humidity.

[0045] In existing welding strip clamping fixtures, the opacity of the aluminum frame makes the structure of the aluminum frame complex, mainly reflected in the complex shape of the second horizontal frame 501 and the uncertain position of the main reinforcing ribs and auxiliary reinforcing ribs, which further increases the difficulty of manufacturing the aluminum frame.

[0046] In some embodiments of the welding strip pressing device provided in this application, the first horizontal frame 101 is strip-shaped and has the same width, which can further simplify the frame structure and reduce the manufacturing difficulty.

[0047] In some embodiments, the diameter of the pressure needle mounting hole 104 is smaller than the width of the first horizontal frame 101, ensuring the structural strength of the pressure needle assembly 200 on the frame 100, thereby ensuring the structural strength of the frame 100. By setting a wider strip-shaped first horizontal frame 101, the strength of the first horizontal frame 101 is ensured, while simplifying the shape of the first horizontal frame 101 and reducing the processing difficulty.

[0048] In some embodiments, at least two first horizontal frames 100 are arranged parallel to each other and at equal intervals, which further simplifies the frame structure and reduces the manufacturing difficulty, while facilitating the arrangement of the pressure pin mounting holes 104 on the frame 100.

[0049] In some embodiments, the reinforcing rib group includes at least two reinforcing ribs 103, which are connected between two adjacent first horizontal frames 101. The structure is simple. Furthermore, each reinforcing rib group has more than three reinforcing ribs 103 arranged at equal intervals. The equally spaced reinforcing ribs can further ensure the structural strength of the frame 100, especially the clamping part 110.

[0050] See Figure 3-4 In some embodiments, the pressure needle assembly 200 includes a first pressure needle 201 and a clamping spring 202. The first pressure needle 201 passes through a corresponding pressure needle mounting hole 104. The clamping spring 202 is disposed between the first pressure needle 201 and the frame 100. When the pressure assembly 200 clamps the workpiece, the clamping spring 202 is used to provide clamping force. Preferably, in the same row of pressure needle assemblies 200: the clamping springs 202 at the beginning and end are used to provide weak clamping force, and the clamping springs in the middle are used to provide strong clamping force.

[0051] See Figure 4 In some embodiments, a retaining ring 105 is provided at one end of the through hole 104; the inner diameter of the retaining ring 105 is smaller than the diameter of the through hole 104.

[0052] See Figure 6 The first pressure needle 201 includes a rod body 2011, a sleeve part 2012, a baffle 2013 and a buckle groove 2014;

[0053] The rod 2011 and the corresponding through hole 104 slide together along the axial direction of the rod 2011;

[0054] The sleeve part 2012 is connected to one axial end of the rod body 2011. The sleeve part 2012 is coaxial with the rod body 2011, and the outer diameter of the sleeve part 2012 is smaller than the outer diameter of the rod body 2011. The sleeve part 2012 passes through the retaining ring 105. The compression spring 202 is sleeved on the outside of the sleeve part 2012. One end of the compression spring 202 abuts against the retaining ring 105, and the other end of the compression spring 202 abuts against the end face of the rod body 2011.

[0055] The baffle 2013 is connected to the other end of the rod 2011 in the axial direction; the outer diameter of the baffle 2013 is larger than the diameter of the through hole 104; in use, the baffle 2013 is located outside the through hole 104;

[0056] The groove 2014 is formed circumferentially on the surface of the socket 2012, and the groove 2014 is away from the rod 2011;

[0057] The clamping assembly 200 also includes a retaining ring 203, which cooperates with the retaining groove 2014. The outer diameter of the retaining ring 203 is larger than the inner diameter of the retaining ring 105. In use, the retaining ring 203 is located outside the through hole 104. The retaining ring 203 and the retaining plate 2013 are used to limit the two ends of the first pressure needle 201, respectively.

[0058] See Figure 8 This application also provides a string welding machine, including a light box, at least two ribbon clamping devices, and a conveyor belt 600; the conveyor belt 600 is used to transport solar cells; when the light box is used to weld the solar cells 400 transported by the conveyor belt 600, the at least two ribbon clamping devices are linearly arranged along the transport direction of the conveyor belt 600; the ribbon clamping devices are the ribbon clamping devices in any embodiment. In use, the solar cells 400 or the solar cells 400 with adhesive coating are placed on the conveyor belt 600 and transported to the ribbon clamping devices, where they are clamped by at least one of the ribbon clamping devices to perform ultraviolet curing or infrared drying operations.

[0059] Finally, it should be noted that the above content is only used to illustrate the technical solution of this application, and is not intended to limit the scope of protection of this application. Simple modifications or equivalent substitutions made by those skilled in the art to the technical solution of this application shall not depart from the substance and scope of the technical solution of this application.

Claims

1. A welding strip pressing device, characterized in that: Includes a frame, a pressure pin assembly, and at least one frame fastener; The frame includes a clamping part and at least one fixing part; the clamping part has pin mounting holes, which are arranged in an array on the clamping part, and one pin assembly is installed in each pin mounting hole; the pin assembly is used to clamp the solder strip during solar cell welding; At least one of the frame fasteners is connected to at least one end of the frame via the fastening part, and the frame fastener is used to position the frame; The clamping part is made of a high-temperature resistant, transparent, hard material.

2. The welding strip pressing device according to claim 1, characterized in that: The heat resistance temperature of the clamping part is not lower than 800℃.

3. The welding strip pressing device according to claim 1 or 2, characterized in that: The clamping part is made of quartz glass.

4. The welding strip pressing device according to claim 1, characterized in that: The pressing part includes a first horizontal frame and a reinforcing rib group; the number of the first horizontal frames is at least two, the number of the pressure needle mounting holes includes at least two columns, and each of the first horizontal frames is provided with a column of pressure needle mounting holes; a reinforcing rib group is provided between each of two adjacent first horizontal frames.

5. The welding strip pressing device according to claim 4, characterized in that: The first horizontal frame is strip-shaped and has the same width.

6. The welding strip pressing device according to claim 5, characterized in that: The diameter of the pressure pin mounting hole is smaller than the width of the first horizontal frame.

7. The welding strip pressing device according to claim 4, characterized in that: The at least two first horizontal frames are parallel to each other and equally spaced.

8. The welding strip pressing device according to claim 4, characterized in that: The reinforcing rib group includes at least two reinforcing ribs, which are connected between two adjacent first horizontal frames.

9. The welding strip pressing device according to claim 4, characterized in that: The pressure needle assembly includes a first pressure needle and a clamping spring. The first pressure needle passes through a corresponding pressure needle mounting hole, and the clamping spring is disposed between the first pressure needle and the frame.

10. A string welding machine, comprising a light box, at least two welding strip clamping devices, and a conveyor belt; the conveyor belt is used to transport solar cells; when the light box is used to weld the solar cells transported by the conveyor belt, the at least two welding strip clamping devices are arranged linearly along the transport direction of the conveyor belt; the welding strip clamping device is the welding strip clamping device according to any one of claims 1-9.

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