Micro-motion correction mechanism and method for improving positioning accuracy of welding strip

Abstract

The application belongs to the technical field of photovoltaic module production equipment, and relates to a micro-motion correcting mechanism for improving the positioning precision of welding strips, which comprises a base, a top rod fixing plate reciprocally moving in the vertical direction is movably connected to the base, a top rod is fixed in the top rod fixing plate, a cell piece support plate is arranged above the top rod fixing plate, each two cell piece support plates form a group, each group of cell piece support plates is provided with a welding strip blanking groove in the middle, the position of the top rod corresponds to the welding strip blanking groove, and a micro-motion correcting mechanism is arranged below each group of cell piece support plates, the micro-motion correcting mechanism comprises a welding strip guide groove with adjustable width, and the welding strip guide groove is connected with the blanking groove. The application also provides a micro-motion correcting method for improving the positioning precision of welding strips. The expected activity space of the welding strip is only 0.2 mm, which greatly improves the repeated positioning precision of the welding strip, and makes the relative position error of the welding strip and the cell piece stable in a smaller fluctuation range.

Description

Technical Field

[0001] This invention belongs to the technical field of photovoltaic module production equipment, specifically relating to a micro-motion correction mechanism and method for improving the positioning accuracy of solder strips. Background Technology

[0002] With the development of photovoltaic technology and manufacturing equipment, the production process of photovoltaic modules has been basically fully automated. The first production process is the stringing of solar cells, which is now fully automated by stringing machines.

[0003] Currently, string welding machine technology in the industry is developing rapidly, and significant breakthroughs have been made in terms of functionality and production capacity, from the previous 3-5 main busbar cell string welding to the current 9-12 and other multi-busbar cell string welding.

[0004] In the process of automatically stringing solar cells using a stringer, in addition to the research and development of welding technology, the positioning and alignment of the welding ribbon with the main busbar and welding points of the solar cells has always been a key aspect of continuous research, development, improvement, and enhancement. With the demand for grid parity and cost reduction in photovoltaic panels, narrowing and thinning of the welding ribbon, thinning of the main busbar of the solar cells, and changes in welding points can all bring considerable cost reduction opportunities, but this will further increase the requirements for the automatic alignment of the stringer. Summary of the Invention

[0005] The purpose of this invention is to address the above-mentioned problems by providing a micro-motion correction mechanism and method for improving the positioning accuracy of the solder strip.

[0006] To achieve the above objectives, the present invention adopts the following technical solutions:

[0007] A micro-motion correction mechanism for improving the positioning accuracy of welding strip includes a base, on which a top rod fixing plate that reciprocates vertically is movably connected. A top rod is fixed inside the top rod fixing plate. A battery cell support plate is provided above the top rod fixing plate. Every two battery cell support plates form a group. Each group of battery cell support plates has a welding strip feeding groove in the middle. The position of the top rod corresponds to the welding strip feeding groove. A micro-motion correction mechanism is provided below each group of battery cell support plates. The micro-motion correction mechanism includes a welding strip guide groove with adjustable width, which is connected to the feeding groove.

[0008] Furthermore, the micro-motion correction mechanism includes two opposing micro-clamp mounting plates, with a welding strip guide groove formed between the two micro-clamp mounting plates. A micro-adjustment rod is movably engaged at each end of the two micro-clamp mounting plates. The micro-adjustment rod can reciprocate in the vertical direction. When the micro-adjustment rod moves upward, the distance between the two micro-clamp mounting plates decreases, thereby reducing the width of the welding strip discharge groove. When the micro-adjustment rod moves downward, the distance between the two micro-clamp mounting plates increases, thereby increasing the width of the welding strip discharge groove.

[0009] Furthermore, each micro-clamp mounting plate has a micro-adjustment head extending out of the battery cell support plate at both ends. Between the micro-adjustment heads at the same end of the two micro-clamp mounting plates, there is a wedge-shaped micro-adjustment rod receiving cavity with a larger upper opening and a smaller lower opening. The top of the micro-adjustment rod is engaged in the micro-adjustment rod receiving cavity and slidably connected to the micro-adjustment head. The bottoms of every two adjacent micro-adjustment rods are connected by a micro-adjustment rod connecting block.

[0010] Furthermore, the top of the fine-tuning rod has a fine-tuning head drive block that matches the shape of the fine-tuning rod receiving cavity. The fine-tuning head drive block is snapped into the fine-tuning rod receiving cavity and slidably connected to the fine-tuning head.

[0011] Furthermore, the length of the top rod fixing plate is matched with the length of the battery cell support plate, and when the top rod fixing plate rises, the top rod fixing plate does not contact the micro-adjustment head.

[0012] Furthermore, the height of the top of the fine-tuning head is lower than the height of the upper surface of the battery cell support plate.

[0013] Furthermore, the fine-tuning rod connecting block is connected to a linear actuator, thereby driving the fine-tuning rod connecting block to move up and down in the vertical direction.

[0014] Furthermore, the push rod fixing plate is connected to a linear actuator, which can drive the push rod to move up and down in the vertical direction.

[0015] Furthermore, the top rods in each top rod fixing plate are evenly spaced, and the battery cell support plate is provided with guide holes that correspond one-to-one with the position of the top rods.

[0016] In another aspect, the present invention provides a micro-motion correction method for improving the positioning accuracy of the solder strip, wherein the aforementioned micro-motion correction mechanism is used to perform micro-motion correction on the solder strip.

[0017] Compared with existing technologies, the advantages of this invention are:

[0018] 1. The expected movement space of the solder ribbon is only within 0.2mm, which greatly improves the repeatability of the solder ribbon and stabilizes the relative position error between it and the battery cell within a smaller fluctuation range.

[0019] 2. Simple structure, high reliability, long service life, and high stability. This significantly improves the string welding performance of the string welding machine.

[0020] Other advantages, objectives and features of the present invention will become apparent in part from the following description, and in part from those skilled in the art through study and practice of the invention. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of the present invention.

[0022] Figure 2 yes Figure 1 A diagram from another direction.

[0023] Figure 3 This is a schematic diagram of the internal structure of the present invention.

[0024] In the figure: base 1, top rod fixing plate 2, top rod 3, guide hole 3a, battery cell support plate 4, welding strip feeding groove 5, micro-motion correction mechanism 6, welding strip guide groove 7, micro-clamp mounting plate 8, micro-adjustment rod 9, micro-adjustment head 10, micro-adjustment rod receiving cavity 11, micro-adjustment head driving block 12, micro-adjustment rod connecting block 13, welding strip 100, battery cell 101. Detailed Implementation

[0025] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0026] Example 1:

[0027] like Figure 1-3 As shown, a micro-motion correction mechanism for improving the positioning accuracy of welding strip includes a base 1. A top rod fixing plate 2 that can reciprocate in the vertical direction is movably connected to the base 1. Several top rods 3 are fixed inside the top rod fixing plate 2. Several battery cell support plates 4 are provided above the top rod fixing plate 2. Every two battery cell support plates 4 form a group. A welding strip dropping groove 5 is provided in the middle of each group of battery cell support plates 4. The position of the top rods 3 corresponds to the welding strip dropping groove 5. A micro-motion correction mechanism 6 is provided below each group of battery cell support plates 4. A welding strip guide groove 7 that can change width is provided inside the micro-motion correction mechanism 6. The welding strip guide groove 7 is connected to the welding strip dropping groove 5.

[0028] In this invention, the length direction of the base 1 is the horizontal direction, and the direction perpendicular to the horizontal longitudinal direction is the vertical direction, such as... Figure 3 As indicated by the middle arrow.

[0029] In this embodiment, the micro-adjustment mechanism 6 adjusts the width of the groove while the top rod 3 is rising and pressing down on the welding strip 100, or before that. The micro-adjustment mechanism 6 is normally open, and when open, the internal gap, i.e., the width of the welding strip guide groove 7, is greater than the width of the welding strip feeding groove 5. During operation, it is clamped, meaning the width of the welding strip guide groove 7 is reduced. At this time, the internal gap is controlled to be larger than the diameter of the welding strip (e.g., 0.5mm). The expected movement space of the welding strip 100 is only within 0.2mm, greatly improving the repeatability of the welding strip's positioning accuracy and stabilizing its relative position error with the battery cell within a smaller fluctuation range.

[0030] Furthermore, in this embodiment, the micro-adjustment mechanism 6 includes two opposing micro-clamp mounting plates 8, forming a welding strip guide groove 7 between the two micro-clamp mounting plates 8. A micro-adjustment rod 9 is movably engaged at each end of the two micro-clamp mounting plates 8. The micro-adjustment rod 9 can reciprocate vertically. When the micro-adjustment rod 9 moves upward, the distance between the two micro-clamp mounting plates 8 decreases, thus reducing the width of the welding strip drop groove 5. When the micro-adjustment rod 9 moves downward, the distance between the two micro-clamp mounting plates 8 increases, thus increasing the width of the welding strip drop groove 5. In other words, in this embodiment, the distance between the two opposing micro-clamp mounting plates 8 is changed by the action of the micro-adjustment rod 9, thereby adjusting the width of the welding strip guide groove 7. This design is simple, reliable, has a long service life, and high stability.

[0031] Specifically, each micro-clamp mounting plate 8 has a micro-adjustment head 10 extending out of the battery cell support plate 4 at both ends. Between the micro-adjustment heads 10 at the same end of the two micro-clamp mounting plates 8, there is a wedge-shaped micro-adjustment rod receiving cavity 11 with a larger upper opening and a smaller lower opening. The top of the micro-adjustment rod 9 is engaged in the micro-adjustment rod receiving cavity 11 and is slidably connected to the micro-adjustment head 10.

[0032] The top of the fine-tuning rod 9 has a fine-tuning head drive block 12 that matches the shape of the fine-tuning rod receiving cavity 11. The fine-tuning head drive block 12 is engaged within the fine-tuning rod receiving cavity 11 and slidably connected to the fine-tuning head 10. That is, the fine-tuning head drive block 12 and the fine-tuning rod receiving cavity 11 form a slider-groove connection, thereby pushing the two micro-clamp mounting plates 8 closer together or further apart during the lifting and lowering process, thereby changing the width of the welding strip guide groove 7.

[0033] The bottoms of every two adjacent fine adjustment rods 9 are connected by a fine adjustment rod connecting block 13. A linear driver is connected through the fine adjustment rod connecting block 13. The linear driver can be a servo linear motor or a cylinder, etc. The linear driver can be fixed on the base and can drive the fine adjustment rod connecting block 13 to move up and down in the vertical direction.

[0034] The push rod fixing plate 2 is connected to a linear driver fixed on the base, which drives the push rod 3 to move up and down vertically. The linear driver can be a servo linear motor or a cylinder, etc.

[0035] The length of the top rod fixing plate 2 is matched with the length of the battery cell support plate 4, and when the top rod fixing plate 2 rises, it does not contact the micro-adjustment head 10. Therefore, in this embodiment, the height of the top of the micro-adjustment head 10 is lower than the height of the upper surface of the battery cell support plate 4. This ensures that the micro-adjustment head 10 does not contact the battery cell 101 whether it is in an open or clamped state, thus preventing damage to the battery cell 101.

[0036] The top rods 3 in each top rod fixing plate 2 are evenly spaced, and the battery cell support plate 4 is provided with guide holes 3a that correspond one-to-one with the positions of the top rods 3.

[0037] On existing string welding machines, the position between the back welding strip and the cell is determined as follows: the welding strip pulling and shearing mechanism straightens the welding strip to a certain length and performs related actions before delivering it to the position where it will be joined with the cell. The front welding strip is placed directly on the front of the cell and then pressed down on the front of the cell by a pressure fixture. The back welding strip of the next cell first falls into an adjustable-width groove, and then the next cell is placed on top of the welding strip. During the actual welding, a rising push rod in the groove presses the welding strip onto the back of the cell, while the guide groove contracts inward to form good contact and precise positioning, achieving the welding effect under certain temperature and time conditions.

[0038] Theoretically, the narrower the groove, the less fluctuation there will be in the position of the solder strip. However, in actual production, there are two problems. First, as the cycle time of the string welding machine becomes shorter and the speed becomes faster, if the groove is too small, the solder strip will not be able to fall into the groove, which will cause even greater problems. Second, there is flux on the solder strip. During the production process, flux crystallizes. If the groove is too narrow, the crystals will get stuck in the groove and block it, preventing the solder strip from falling into the groove. Therefore, the current width of this groove is about 0.8mm-1.0mm.

[0039] Currently, the solder strip in multi-busbar module products is already 0.32mm, and it may become even thinner in the future. In this case, the solder strip will have a movement space of about 0.5 to 0.7mm in the slot. That is, the size and width of the welding PAD point on the main busbar of the cell must be able to accommodate this fluctuation range. Therefore, the current PAD point size design is about 1.2mm wide.

[0040] In this embodiment, while the top rod 3 in the ribbon feeding groove 5 rises to press down on the ribbon 100, or before that, the micro-adjustment head drive block 12 rises to drive the two micro-clamp mounting plates 8 to move closer together, making the width of the ribbon guide groove 7 smaller. At this time, the width of the ribbon guide groove 7 is controlled to be greater than the diameter of the ribbon 100. With this setting, the expected activity space of the ribbon is only within 0.2mm, which greatly improves the repeatability of the ribbon positioning accuracy and makes its relative position error with the battery cell stable within a smaller fluctuation range.

[0041] Example 2:

[0042] A micro-motion correction method for improving the positioning accuracy of the welding strip is provided. The micro-motion correction mechanism of Example 1 is used to perform micro-motion correction on the welding strip. When welding the welding strip on the back of the battery cell 101, the battery cell 101 is placed on the battery cell support plate 4, and the welding strip 100 is located below the battery cell 101. The top rod fixing plate 2 is driven by the linear actuator to rise and drive the top rod 3 to rise and press against the welding strip 100. The micro-adjustment rod connecting block 13 is driven by the linear actuator to rise. The micro-adjustment head driving block 12 drives the micro-adjustment heads 10 on both sides to move closer to each other, so that the micro-clamp mounting plates 8 move closer to each other. The width of the welding strip guide groove 7 becomes smaller, clamping the welding strip 100, so that the movement space of the welding strip 100 is less than 0.2mm.

[0043] After welding is completed, the fine-tuning rod connecting block 13 descends under the drive of the linear actuator, the fine-tuning head driving block 12 drives the fine-tuning heads 10 on both sides to move away from each other, thereby making the micro clamp mounting plates 8 move away from each other. The width of the welding strip guide groove 7 increases, the activity space of the welding strip 100 in the welding strip guide groove 7 increases, and the top rod fixing plate 2 descends under the drive of the linear actuator, which in turn drives the top rod 3 to descend.

[0044] The specific embodiments described herein are merely illustrative examples of the spirit of the invention. Those skilled in the art to which this invention pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of the invention.

Claims

1. A micro-motion correction mechanism for improving the positioning accuracy of welding strips, characterized in that: Includes a base (1), on which a top rod fixing plate (2) reciprocates vertically and is movably connected. A top rod (3) is fixed inside the top rod fixing plate (2). A battery cell support plate (4) is provided above the top rod fixing plate (2). Every two battery cell support plates (4) form a group. Each group of battery cell support plates (4) has a welding strip dropping groove (5) in the middle. The position of the top rod (3) corresponds to the welding strip dropping groove (5). A micro-motion correction mechanism (6) is provided below each group of battery cell support plates (4). The micro-motion correction mechanism (6) includes a welding strip guide groove (7) with adjustable width. The welding strip guide groove (7) is connected to the dropping groove (5). The micro-motion correction mechanism (6) includes two opposing micro-clamp mounting plates (8), forming a welding strip guide groove (7) between the two micro-clamp mounting plates (8). A micro-adjustment rod (9) is movably engaged at both ends of the two micro-clamp mounting plates (8). The micro-adjustment rod (9) moves back and forth in the vertical direction. When the micro-adjustment rod (9) moves upward, the distance between the two micro-clamp mounting plates (8) decreases, thereby reducing the width of the welding strip drop groove (5). When the micro-adjustment rod (9) moves downward, the distance between the two micro-clamp mounting plates (8) increases, thereby increasing the width of the welding strip drop groove (5).

2. The micro-motion correction mechanism for improving the positioning accuracy of the welding strip according to claim 1, characterized in that, Each micro-clamp mounting plate (8) has a micro-adjustment head (10) extending out of the battery cell support plate (4) at both ends. The micro-clamp mounting plates (8) have a wedge-shaped micro-adjustment rod receiving cavity (11) between the micro-adjustment heads (10) at the same end. The top of the micro-adjustment rod (9) is engaged in the micro-adjustment rod receiving cavity (11) and is slidably connected to the micro-adjustment head (10). The bottoms of every two adjacent micro-adjustment rods (9) are connected by a micro-adjustment rod connecting block (13).

3. The micro-motion correction mechanism for improving the positioning accuracy of the welding strip according to claim 2, characterized in that, The top of the fine adjustment rod (9) has a fine adjustment head drive block (12) that matches the shape of the fine adjustment rod receiving cavity (11). The fine adjustment head drive block (12) is snapped into the fine adjustment rod receiving cavity (11) and slidably connected to the fine adjustment head (10).

4. The micro-motion correction mechanism for improving the positioning accuracy of the welding strip according to claim 2, characterized in that, The length of the top rod fixing plate (2) is matched with the length of the battery cell support plate (4), and when the top rod fixing plate (2) rises, the top rod fixing plate (2) does not contact the micro-adjustment head (10).

5. The micro-motion correction mechanism for improving the positioning accuracy of the welding strip according to claim 2, characterized in that, The height of the top of the micro-adjustment head (10) is lower than the height of the upper surface of the battery cell support plate (4).

6. The micro-motion correction mechanism for improving the positioning accuracy of the welding strip according to claim 3, characterized in that, The fine-tuning rod connecting block (13) is connected to a linear actuator, which can drive the fine-tuning rod connecting block (13) to move up and down in the vertical direction.

7. The micro-motion correction mechanism for improving the positioning accuracy of the welding strip according to claim 1, characterized in that, The top rod fixing plate (2) is connected to a linear actuator, which can drive the top rod (3) to move up and down in the vertical direction.

8. The micro-motion correction mechanism for improving the positioning accuracy of the welding strip according to claim 1, characterized in that, The top rods (3) in each top rod fixing plate (2) are evenly spaced, and the battery cell support plate (4) is provided with guide holes that correspond one-to-one with the positions of the top rods (3).

9. A micro-motion correction method for improving the positioning accuracy of solder strip, wherein the micro-motion correction mechanism as described in any one of claims 1-8 is used to perform micro-motion correction on the solder strip.

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