Welding tool

Abstract

The utility model provides a welding tool which is used for welding bus bars and welding strips in a solar battery, the solar battery comprises a battery string composed of a plurality of battery pieces electrically connected in sequence and a flexible back plate arranged on the battery string, the welding strips are arranged on the two sides of the battery string, and the welding tool comprises a welding platform and a welding slag collecting device. The welding platform is used for bearing solar cells; the welding slag collecting device is placed on a battery string to collect welding slag when a bus bar is welded on a welding strip, so that random scattering of the welding slag is avoided, pollution of the welding slag to a battery piece is prevented, the performance of a solar battery is guaranteed, cleanness of a welding area is kept, the stability and reliability of welding quality are guaranteed, and the service life of the solar battery is prolonged. And the collected welding slag can be reused, so that the waste of the welding slag is reduced as much as possible.

Description

Technical Field

[0001] The present application relates to the technical field of solar cell production, and in particular to a welding tool. Background Art

[0002] During the production process of solar cells, for example, in the production process of back-contact cells, multiple back-contact cell sheets need to be welded together to form a cell string, and welding strips are formed at both ends of the cell string. The welding strips are then welded to the busbars to form a loop to achieve current collection and output. However, during the welding process, it is easy for splashing welding slag to fall onto the cell sheets, causing contamination of the cell sheets, affecting the performance of the solar cell, and also resulting in waste of welding slag. Utility Model Content

[0003] The present application discloses a welding tool, which can ensure the performance of solar cells after welding and reduce the waste of welding slag.

[0004] To achieve the above objectives, the present application discloses a welding tool for welding busbars and welding ribbons in solar cells. The solar cells include a battery string consisting of a plurality of sequentially electrically connected battery cells, and a flexible backsheet disposed on the battery string. The welding ribbons are disposed on both sides of the battery string. The welding tool comprises:

[0005] A welding platform, the welding platform is used to support the solar cell;

[0006] A welding slag collecting device is placed on the battery string to collect welding slag when the busbar is welded to the welding ribbon.

[0007] Optionally, the welding platform has a center position, the flexible backplate is positioned at the center position, the flexible backplate has a first edge along a first direction, and a distance between the first edge and the center position is a first preset value;

[0008] The welding slag collecting device has a receiving opening, and along the first direction, the distance between the welding slag collecting device and the center position is less than a first preset value, so that when the first edge of the flexible back panel abuts against the receiving opening, or when the first edge is inserted into the receiving opening, an arched protrusion is formed between the first edge and the center position.

[0009] Optionally, the first edge of the flexible back panel is inserted into the receiving opening.

[0010] Optionally, the welding slag collecting devices include two, and the two welding slag collecting devices are symmetrically arranged on both sides of the center position along the first direction.

[0011] Optionally, the welding slag collecting devices include two, and the two welding slag collecting devices are arranged near both sides of the battery string. The arched protrusions include two, and the two arched protrusions correspond to the two welding slag collecting devices respectively.

[0012] Optionally, the welding tool further includes an anti-warping device, which is used to prevent the welding strip from warping when the bus bar is welded to the welding strip.

[0013] Optionally, the anti-tilting device includes a pressure block, which is placed on the battery cells at the ends of either side of the battery string.

[0014] Optionally, there are two pressure blocks, which are respectively placed on the battery cells at the ends of both sides of the battery string.

[0015] Optionally, a buffer layer is arranged around the outer periphery of the pressure block.

[0016] Optionally, the anti-warping device is detachably connected to the welding slag collecting device.

[0017] Optionally, a first clamping structure is provided on the anti-tilting device, and a second clamping structure is provided on the welding slag collecting device, and the first clamping structure is clamped and matched with the second clamping structure.

[0018] Compared with the prior art, the present invention has the following advantages:

[0019] By making the welding tool include a welding slag collection device, the welding slag collection device is placed on the busbar when the busbar is welded to the welding ribbon, so that the welding slag enters the collection device when the busbar is welded to the welding ribbon, thereby avoiding the welding slag from scattering at will and preventing the welding slag from contaminating the battery cell, thereby ensuring the performance of the solar cell, and also helping to keep the welding area clean, thereby ensuring the stability and reliability of the welding quality. In addition, the welding slag is collected in the welding slag collection device, which is convenient for subsequent unified cleaning, saving cleaning time and energy, and the collected welding slag can be reused to minimize the waste of welding slag. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0021] Figure 1 This is a structural diagram of a welding tool provided in an embodiment of the present application;

[0022] Figure 2 This is a schematic diagram of a solar cell provided in an embodiment of the present application being carried on a welding tool;

[0023] Figure 3 This is a front view of a solar cell provided in an embodiment of the present application being carried on a welding tool;

[0024] Figure 4 This is a structural diagram of another welding tool provided in an embodiment of the present application;

[0025] Figure 5 This is a front view of a solar cell provided in an embodiment of the present application carried on another welding tool.

[0026] Description of main reference numerals

[0027] 1-Welding tooling;

[0028] 2-solar cell; 20-cell string; 21-flexible backsheet; 22-first edge; 23-arched protrusion; 24-flat portion;

[0029] 30-bus bar;

[0030] 100-welding platform; 110-center position;

[0031] 200- welding slag collecting device; 210- receiving port;

[0032] 300-Anti-tilt device; 310-Handle. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0034] In this application, terms such as "upper," "lower," "left," "right," "front," "back," "top," "bottom," "inner," "outer," "center," "vertical," "horizontal," "transverse," and "longitudinal" indicate positions or locations based on the positions or locations shown in the accompanying drawings. These terms are primarily intended to better describe this application and its embodiments and are not intended to limit the devices, elements, or components indicated to having a specific orientation, or to being constructed or operated in a specific orientation.

[0035] Furthermore, some of the above terms may be used to express other meanings besides indicating a position or location. For example, the term "on" may also be used to indicate a dependency or connection in certain circumstances. Those skilled in the art will understand the specific meanings of these terms in this application based on the specific circumstances.

[0036] Furthermore, the terms "installed," "disposed," "provided with," "connected," and "connected" should be interpreted broadly. For example, they can refer to fixed connections, removable connections, or integral structures; mechanical connections or electrical connections; direct connections, indirect connections through an intermediary, or internal communication between two devices, elements, or components. Those skilled in the art will understand the specific meanings of these terms in this application based on the specific circumstances.

[0037] Furthermore, the terms "first," "second," etc., are primarily used to distinguish between different devices, elements, or components (which may or may not be of the same type and configuration), and are not intended to indicate or imply the relative importance or quantity of the devices, elements, or components indicated. Unless otherwise specified, "plurality" means two or more.

[0038] As mentioned in the background technology, in the production process of solar cells, for example, in the production process of back-contact cells, multiple back-contact cell sheets need to be welded together to form a cell string, and welding strips are formed at both ends of the cell string, and then the welding strips are welded to the busbars to form a loop to achieve current collection and output. However, during the welding process, it is easy for splashing welding slag to fall onto the cell sheets, causing contamination of the cell sheets, affecting the performance of the solar cells, and also resulting in waste of welding slag.

[0039] In order to solve the above problems, the present application provides a welding tool, which includes a welding slag collection device. When the bus bar is welded to the welding ribbon, the welding slag collection device is placed on the battery string, so that when the bus bar is welded to the welding ribbon, the guide part of the flexible backplane introduces the welding slag into the welding slag collection device, thereby avoiding the welding slag from being scattered randomly and preventing the welding slag from contaminating the battery cell, thereby ensuring the performance of the solar cell, and also helping to keep the welding area clean, thereby ensuring the stability and reliability of the welding quality, and the collected welding slag can be reused to minimize the waste of welding slag.

[0040] The technical solution of the present application will be further described below with reference to specific embodiments and drawings.

[0041] See also Figure 1 、 Figure 2 as well as Figure 3This embodiment provides a welding tool 1, which is used to weld a busbar 30 and a welding ribbon in a solar cell 2. The solar cell 2 includes a battery string 20 consisting of a plurality of battery cells electrically connected in sequence, and a flexible backplane 21 arranged on the busbar 30. The welding ribbons are arranged on both sides of the busbar 30. The welding tool 1 includes: a welding platform 100 and a welding slag collection device 200. The welding platform 100 is used to support the solar cell 2; the welding slag collection device 200 is placed on the busbar 30 to collect welding slag when the busbar 30 is welded to the welding ribbon.

[0042] By making the welding tool 1 include a welding slag collecting device 200, the welding slag collecting device 200 is placed on the busbar 30 when the busbar 30 is welded to the welding ribbon, so that the welding slag enters the welding slag collecting device 200 when the busbar 30 is welded to the welding ribbon, thereby avoiding the welding slag from being scattered at will and preventing the welding slag from contaminating the battery cell, thereby ensuring the performance of the solar cell 2, and also helping to keep the welding area clean, thereby ensuring the stability and reliability of the welding quality. In addition, the welding slag is collected in the welding slag collecting device 200, which is convenient for subsequent unified cleaning, saving cleaning time and energy, and the collected welding slag can be reused to minimize the waste of welding slag.

[0043] In one possible embodiment, see Figure 2 and Figure 3 The welding platform 100 has a center position 110, the flexible back panel 21 is positioned at the center position 110, the flexible back panel 21 has a first edge 22 along a first direction, and the distance between the first edge 22 and the center position 110 is a first preset value; the welding slag collecting device 200 has a receiving port 210, and along the first direction, the distance between the welding slag collecting device 200 and the center position 110 is less than the first preset value, so that when the first edge 22 of the flexible back panel 21 abuts against the receiving port, or when inserted into the receiving port 210, an arched protrusion is formed between the first edge 22 of the flexible back panel 21 and the center position 110.

[0044] Among them, the first direction is Figure 3 The direction indicated by the arrow X.

[0045] It should be noted that the above-mentioned first preset value depends on the size of the flexible backplane. For example, when the length of the flexible backplane along the first direction is 2370 mm, if the center line of the flexible backplane 21 along the first direction coincides with the center position 110, the first preset value is 1135 mm.

[0046] Among them, the above-mentioned arched protrusion should be understood as, when the first edge 22 of the flexible back panel 21 abuts against the receiving port 210, or when the first edge 22 is inserted into the receiving port 210, there is a protrusion structure similar to the shape of an arch bridge between the first edge 22 of the flexible back panel 21 and the center position 110, which has a certain curvature and protrusion height, and its arched surface can play a role in guiding the flow direction of the welding slag.

[0047] Therefore, the arched protrusion can more accurately guide the welding slag to the welding slag collection device 200, thereby improving the accuracy and efficiency of welding slag collection, and the abutment or insertion cooperation between the arched protrusion and the receiving port 210 can ensure that the welding slag can enter the collection device more smoothly, reduce the overflow of welding slag, and different abutment or insertion methods can adapt to different situations, thereby improving the flexibility of the welding tool 1. In addition, the abutment or insertion cooperation between the arched protrusion and the receiving port 210 can better prevent the welding slag from scattering, and provide better protection for surrounding components.

[0048] For example, see Figure 3 When the size of the flexible backplane 21 is 1128mm×2370mm, its length in the first direction is 2370mm, and the flexible backplane 21 also includes a straight portion 24 with a size of 1128mm×550mm, the length of the straight portion 24 in the first direction is 550mm, and the center line of the straight portion 24 in the first direction coincides with the center position 110 of the welding platform 100. At this time, on a single side of the center position 110, the length of the arched protrusion formed on the flexible backplane 21 is 910mm.

[0049] In one possible embodiment, see Figure 3 The first edge 22 of the flexible back panel 21 is inserted into the receiving opening 210 .

[0050] By inserting the first edge 22 of the flexible back panel 21 into the receiving port, the welding slag can be smoothly introduced into the receiving port 210 along the entire arched surface, minimizing the deviation or omission of the welding slag, and allowing the welding slag to enter the collection device more quickly and comprehensively, thereby improving the efficiency and effect of welding slag collection. In addition, by inserting the first edge 22 of the arched protrusion into the receiving port, the connection stability between the flexible back panel 21 and the welding slag collection device 200 is further enhanced, reducing the displacement or detachment that may occur during operation, and avoiding the accumulation or overflow of welding slag in certain parts due to the loose connection between the arched protrusion and the receiving port 210, thereby ensuring the continuity and integrity of the welding slag collection process.

[0051] In one possible embodiment, see Figure 2 and Figure 3 The welding slag collecting device 200 includes two welding slag collecting devices 200, which are symmetrically arranged on both sides of the center position along the first direction.

[0052] Thus, the two slag collecting devices 200 can collect the slag on both sides of the busbar 30 at the same time, ensuring that the slag will not be missed or scattered to other places, and can also enable workers to weld both ends of the busbar 30 at the same time, thereby improving production efficiency.

[0053] In one possible embodiment, see Figure 4 The welding tool 1 also includes an anti-warping device 300, which is used to prevent the welding strip from warping when the busbar 30 is welded to the welding strip.

[0054] Since there is a reserved arch on the welding ribbon, during the welding process of welding the busbar 30 to the welding ribbon, the back contact battery welding point is located on the back side. After welding, the thermal stress is large, which will cause the battery cell to warp. If welding is carried out in a warped state, during the lamination process, the welding point between the welding ribbon and the busbar 30 is subjected to stress, which may easily cause the welding ribbon and the busbar 30 to become desoldered. Based on this, in this embodiment, the welding tool 1 includes an anti-warping device 300 to prevent the welding ribbon from warping, thereby ensuring good contact and welding between the busbar 30 and the welding ribbon, avoiding problems such as cold welding and loose welding, thereby improving the welding quality, and stabilizing the welding ribbon can make the welding process smoother and more predictable, reduce welding interruptions or adverse conditions caused by accidental warping of the welding ribbon, and improve production stability and continuity. In addition, it can also avoid collisions or damages to the battery cell caused by warping of the welding ribbon, thereby reducing the defective rate.

[0055] In one possible embodiment, see Figure 4 and Figure 5 The anti-tilting device 300 includes a pressure block, which is placed on the battery cells at the ends of either side of the battery string 20 .

[0056] The pressure block may be made of metal or other materials with higher density, and may be a plate-like structure or a block-like structure, which is not limited here.

[0057] By making the anti-warping device 300 include a pressure block, and placing the pressure block on the battery cell at the end of either side of the battery string 20, the anti-warping device 300 can directly apply downward pressure to the battery cell at the end of either side of the battery string 20, thereby, the welding strip is also pressed down accordingly, so that when the bus bar 30 is welded to the welding strip, the battery cell can be effectively prevented from warping due to heat and other factors during the welding process, and the position of the bus bar 30 can be ensured to be stable and maintain good contact with the welding strip, which is conducive to precise welding. In addition, the pressure block is usually inexpensive and economical.

[0058] In one possible embodiment, see Figure 4 A handle 310 is provided on the anti-tilting device 300 to facilitate the staff to place or remove the anti-tilting device 300.

[0059] In one possible embodiment, see Figure 4 and Figure 5 The pressure blocks include two, and the two pressure blocks are respectively placed on the battery cells at the ends of both sides of the battery string 20.

[0060] In this way, pressure can be applied to the battery cells at the ends of both sides of the battery string 20 at the same time, preventing the battery cells from warping up from both sides, ensuring the reliability and stability of welding, and making the battery string 20 as a whole evenly stressed, avoiding uneven welding or other problems that may be caused by unilateral pressure. It also helps to maintain consistent welding effects on both sides and improve the consistency of product quality. In addition, welding can be performed on both sides of the battery string 20 at the same time, which improves the efficiency of the welding operation.

[0061] In a possible embodiment, a buffer layer is disposed around the outer periphery of the pressure block.

[0062] The buffer layer includes sponge and Teflon cloth. The thickness of the buffer layer can be 2mm. The sponge prevents the battery cells from being bumped and cracked, and the outermost Teflon cloth protects the battery cells from being scratched.

[0063] By setting up a buffer layer, it is possible to avoid damage caused by direct hard contact between the pressure block and components such as the battery cell, and to protect the battery string 20, welding ribbon and bus bar 30. During the placement and pressure application process, it can buffer the possible impact force, reduce the adverse effects on surrounding components, and help to distribute the pressure more evenly on the contact surface, ensuring the stability and reliability of the pressure effect. In addition, it can also increase the friction between the pressure block and the battery cell, preventing the pressure block from moving relative to the battery cell during the welding process, thereby causing the bus bar 30 to shift, thereby improving the welding quality.

[0064] In a possible embodiment, the anti-lifting device 300 is detachably connected to the slag collecting device 200 .

[0065] Therefore, whether to install the anti-warping device 300 and the welding slag collection device 200 can be selected according to actual needs, which increases the flexibility of use. When one of the devices is damaged or needs maintenance, it can be disassembled and processed separately without affecting the normal use of the other device, reducing maintenance costs and difficulty. It can also meet the different needs of anti-warping and welding slag collection in different welding scenarios. The detachable connection facilitates personalized configuration and adjustment according to specific circumstances. For welding tasks of different specifications or types, the appropriate anti-warping device 300 or welding slag collection device 200 can be quickly replaced to improve work efficiency.

[0066] The detachable connection may be any detachable connection such as a threaded connection, a pin connection, a key connection, a snap connection, a quick connector connection, a plug connection, etc., which is not limited here.

[0067] For example, a piece of TPC material is selected to make a welding slag collection device 200. The size of the welding slag collection device 200 matches the width of the flexible backsheet 21 of the component to be welded, and can be completely connected to the flexible backsheet 21 to form an effective collection space. A pressure block with a length, width and height of 140 cm × 3.8 cm × 0.5 cm and a weight of 2.5 kg is made. The outer periphery is wrapped with a layer of 2 mm thick sponge and polytetrafluoroethylene cloth. The pressure block is pressed on the battery cells at the ends of the battery string 20. At this time, the reserved warpage of the battery cell and the welding ribbon is reduced from 4 mm to 0. One side of the pressure block is aligned with the third welding point of the edge battery cell, and the other edge is the positioning position of the busbar 30. The busbar 30 can be positioned against the edge of the pressure block to complete the positioning. The welding slag collection device 200 is combined with the metal plate. After the combination is completed, the welding slag collection device 200 and the pressure block are an integrated device, which can simultaneously realize the functions of flattening the battery cell and welding ribbon, positioning the busbar 30 and collecting welding slag. It can also be selected according to different scenarios whether the combined tooling is needed, thereby achieving the purpose of simple and flexible use.

[0068] After the placement is completed, the adhesive film and the flexible back panel 21 are laid in sequence. The first edge 22 of the flexible back panel 21 extends into the receiving port 210. The flexible back panel 21 is M-shaped at this time. During the welding process of the bus bar 30, if welding slag falls on the flexible back panel 21, the welding slag can automatically fall into the welding slag collection device 200 along the arched protrusion of the flexible back panel 21, completing the automatic collection function of the welding slag.

[0069] In a possible embodiment, the anti-tilting device 300 is provided with a first clamping structure, and the welding slag collecting device 200 is provided with a second clamping structure, and the first clamping structure is clamped and matched with the second clamping structure.

[0070] By providing a first clamping structure on the anti-tilting device 300 and a second clamping structure on the welding slag collecting device 200, the first clamping structure and the second clamping structure are clamped together, so that the anti-tilting device 300 and the welding slag collecting device 200 can be quickly connected and separated, thereby improving operational efficiency. It can also ensure the accuracy of the relative position of the anti-tilting device 300 and the welding slag collecting device 200, and work together better. The connection and disassembly can be completed without complex tools and tedious steps, thereby reducing the difficulty of operation.

[0071] Among them, the first snap-fitting structure and the second snap-fitting structure can be snap-fitted with each other in any form, such as snap-fitting with a snap-fitting slot, elastic protrusion with a snap-fitting groove, dovetail snap-fitting, wedge-shaped snap-fitting, spherical snap-fitting with a snap-fitting hole, hook with a snap-fitting ring, etc., which are not limited here.

[0072] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the welding tooling of the present application, rather than to limit it. Although the welding tooling of the present application has been described in detail with reference to the above embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. These modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A welding tool, characterized in that: The welding tool is used for welding busbars and welding ribbons in solar cells. The solar cells include a battery string consisting of a plurality of battery cells electrically connected in sequence, and a flexible backsheet provided on the battery string. The welding ribbons are provided on both sides of the battery string. The welding tool includes: A welding platform, the welding platform is used to support the solar cell; A welding slag collecting device is placed on the battery string to collect welding slag when the busbar is welded to the welding ribbon.

2. The welding tool according to claim 1, characterized in that: The welding platform has a center position, the flexible back plate is positioned at the center position, the flexible back plate has a first edge along a first direction, and the distance between the first edge and the center position is a first preset value; The welding slag collecting device has a receiving opening, and along the first direction, the distance between the welding slag collecting device and the center position is less than the first preset value, so that when the first edge of the flexible back panel abuts against the receiving opening, or when the first edge is inserted into the receiving opening, an arched protrusion is formed between the first edge and the center position.

3. The welding tool according to claim 2, characterized in that: The first edge of the flexible back plate is inserted into the receiving opening.

4. The welding tool according to claim 2, characterized in that: The welding slag collecting devices include two, and the two welding slag collecting devices are symmetrically arranged on both sides of the center position along the first direction.

5. The welding tool according to claim 1, characterized in that: The welding tool further includes an anti-warping device, which is used to prevent the welding strip from warping when the bus bar is welded to the welding strip.

6. The welding tool according to claim 5, characterized in that: The anti-tilting device includes a pressure block placed on the battery cells at the ends of either side of the battery string.

7. The welding tool according to claim 6, characterized in that: The pressure blocks include two, and the two pressure blocks are respectively placed on the battery sheets at the ends of both sides of the battery string.

8. The welding tool according to claim 6, characterized in that: A buffer layer is arranged around the outer periphery of the pressure block.

9. The welding tool according to claim 5, characterized in that: The anti-warping device is detachably connected to the welding slag collecting device.

10. The welding tool according to claim 5, characterized in that: The anti-tilting device is provided with a first clamping structure, and the welding slag collecting device is provided with a second clamping structure, and the first clamping structure is clamped and matched with the second clamping structure.

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