Solder strip pressing tool and photovoltaic cell string forming device with same

Abstract

The utility model provides a solder strip hold-down fixture and a photovoltaic cell string device with the same, the solder strip hold-down fixture comprises a hold-down fixture base, a moving seat and a plurality of clamping jaw modules, each clamping jaw module comprises a first clamping jaw and a second clamping jaw which are arranged oppositely, the first clamping jaw and the second clamping jaw are pivotally connected with the hold-down fixture base through connecting pins, and the moving seat is connected with the first clamping jaw and the second clamping jaw. A clamping and positioning space is formed between the lower ends of the first clamping jaws and the lower ends of the second clamping jaws, the clamping and positioning spaces are used for clamping and positioning the free ends of the connecting sections of the welding strips on the photovoltaic cells, and the movable base is provided with a low position generated under the action of the gravity of the movable base and a high position generated under the action of external lifting force. When the moving seat is located at the low position, the clamping jaw module can release clamping, and when the moving seat is located at the high position, the clamping jaw module can achieve clamping. According to the utility model, the position of the solder strip is kept unchanged when the battery pieces advance on the tandem transportation platform, so that the back film strips of the battery pieces can be smoothly and reliably attached.

Description

Technical Field

[0001] This utility model relates to the field of photovoltaic cell string manufacturing technology, specifically to a welding strip press and a photovoltaic cell stringing device having the same. Background Technology

[0002] A photovoltaic module's photovoltaic panel is made up of multiple cell strings connected together by busbars, and a cell string is made up of multiple cells connected together by solder strips. When laying solder strips on the cells, the solder strips need to be connected to the grid lines of the cells.

[0003] Common methods for connecting the solder strip to the cell in gridless solar cells include welding, adhesive bonding, and membrane strip (also known as adhesive film or strip) bonding. Because welding is costly and adhesive bonding suffers from poor conductivity, membrane strip bonding is widely favored in the industry.

[0004] During the film strip connection process, not only the welding ribbons on the front of the battery cell need to be film-coated and connected, but the welding ribbons on the back of the battery cell also need to be film-coated and connected to the battery cell. This film-coating connection process requires flipping the front and back of the battery cell. The flipped battery cell is placed back-side up on the string transport platform for film-coating of the back welding ribbons. The welding ribbons on the next battery cell are placed on the back of the previous battery cell. The welding ribbons are prone to positional deviations as they travel on the string transport platform, which is not conducive to the film strips being attached to the back of the battery cell. Utility Model Content

[0005] The welding strip press and photovoltaic cell stringing device designed in this utility model can overcome the shortcomings of the prior art where the flipped cells are placed back-side up on the stringing transport platform for back welding strip coating, and the welding strip on the next cell is placed on the back of the previous cell. The welding strip is prone to positional deviation during its movement on the stringing transport platform, which is not conducive to the coating of the back film strip of the cell.

[0006] The purpose of this utility model is to provide a welding strip press, including a press base, a movable base, and multiple clamping jaw modules. Each clamping jaw module includes a first clamping jaw and a second clamping jaw arranged opposite to each other. The first clamping jaw and the second clamping jaw are pivotally connected to the press base via a connecting pin. A clamping and positioning space is formed between the lower ends of each first clamping jaw and the second clamping jaw. Each clamping and positioning space is used to clamp and position the free ends of the connecting segments of each welding strip on a photovoltaic cell. The movable base has a low position generated by its own gravity and a high position generated by an external lifting force. When the movable base is in the low position, the clamping jaw module can release the clamping of the free ends of the welding strip connecting segments in each clamping and positioning space. When the movable base is in the high position, the clamping jaw module can clamp the free ends of the welding connecting segments in each clamping and positioning space.

[0007] In some embodiments, a first elastic element is held between the upper ends of the first gripper and the second gripper. When the movable seat is in the high position, the gripper module can clamp the free end of the welded connection segment located in each of the clamping positioning spaces under the action of the first elastic element.

[0008] In some embodiments, the movable seat is in the high position when the external electromagnetic force applying structure is energized, and in the low position when the electromagnetic force applying structure is de-energized.

[0009] In some embodiments, drive links are provided at the left and right ends of the press base, the drive links are pivotally connected to the press base, and the first end of the drive link abuts against and is supported on the bottom side of the movable seat, and the second end of the drive link can be attracted by the electromagnetic force application structure or the permanent magnet and rotate downward around the pivot connection point between it and the press base, with the first end and the second end respectively located on both sides of the pivot connection point.

[0010] In some embodiments, guide rods are provided between the two ends of the movable seat and the press base, and a second elastic element is sleeved on the outer periphery of the guide rod, the second elastic element being clamped between the movable seat and the press base.

[0011] In some embodiments, within the same gripper module, a clamping limiting post is provided between the lower ends of the first gripper and the second gripper, and the clamping limiting post is connected to the press base.

[0012] In some embodiments, for the same gripper module, the upper ends of the first gripper and the second gripper are inclined structures that extend close to each other, and the movable seat has force-applying columns on both sides of the upper end of each gripper module, with each force-applying column corresponding to and abutting against each of the inclined structures.

[0013] This utility model also provides a photovoltaic cell stringing device, including the above-mentioned welding strip press.

[0014] In some embodiments, the photovoltaic cell stringing device further includes a stringing transport platform having a loading end on the upstream side of the cell conveying direction and a unloading end on the downstream side of the cell conveying direction, wherein the electromagnetic force application structure is disposed at the loading end.

[0015] In some embodiments, the string transport platform further has an intermediate section between the loading end and the unloading end, and permanent magnets are respectively provided on the left and right sides of the intermediate section. The permanent magnets enable the clamping and positioning spaces of each welding strip press corresponding to their positions to form left and right clamping and positioning of each welding strip free end.

[0016] The welding strip press and the photovoltaic cell stringing device of this utility model can realize the clamping or unclamping action of each gripper module by controlling the switching of the height position of the moving seat, thereby realizing the clamping and positioning or unclamping of the welding strip. The structure is simple and ensures that the position of the welding strip remains unchanged during the movement of the cell on the stringing transport platform, which facilitates the smooth and reliable application of the film strip on the back of the cell. Attached Figure Description

[0017] Figure 1 This is a three-dimensional structural schematic diagram of the welding strip press in an embodiment of this utility model;

[0018] Figure 2 yes Figure 1 A three-dimensional structural diagram of the gripper module in the image;

[0019] Figure 3 yes Figure 1 A three-dimensional structural diagram omitting the base of the press fixture;

[0020] Figure 4 yes Figure 1 A schematic diagram of the welding strip clamp from one perspective;

[0021] Figure 5 yes Figure 4 Cross-sectional view of AA.

[0022] In the diagram: 301, clamping and positioning space; 31, press base; 32, movable seat; 321, force-applying column; 33, gripper module; 331, first gripper; 332, second gripper; 333, connecting pin; 334, first elastic element; 335, clamping and limiting column; 35, drive linkage; 361, guide rod; 362, second elastic element; 37, protective block; 381, base plate; 382, ​​positioning groove. Detailed Implementation

[0023] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that the present invention will be thorough and complete, and will fully convey the concept of the exemplary embodiments to those skilled in the art. In the drawings, for clarity, the thickness of regions and layers is exaggerated. The same reference numerals in the drawings denote the same or similar structures, and therefore their detailed descriptions will be omitted.

[0024] The described features, structures, or characteristics can be combined in any suitable manner in one or more embodiments. Numerous specific details are provided in the following description to give a full understanding of embodiments of the present invention. However, those skilled in the art will recognize that the technical solutions of the present invention can be practiced without one or more of the specific details described, or other methods, components, materials, etc., can be employed. In other instances, well-known structures, materials, or operations are not shown or described in detail to avoid obscuring various aspects of the present invention.

[0025] The following example describes the welding strip press and the photovoltaic cell stringing device having the same. This example is only a part of the embodiments of the present invention, but the protection scope of the present invention is not limited thereto. All other embodiments obtained by those skilled in the art without inventive effort should be covered within the protection scope of the present invention.

[0026] Please refer to the reference. Figures 1 to 5According to an embodiment of the present invention, a welding strip press is provided, including a press base 31, a movable base 32, and a plurality of gripper modules 33. Each gripper module 33 includes a first gripper 331 and a second gripper 332 disposed opposite to each other. The first gripper 331 and the second gripper 332 are pivotally connected to the press base 31 by a connecting pin 333. A clamping and positioning space 301 is formed between the lower ends of each first gripper 331 and the second gripper 332. Each clamping and positioning space 301 is used to clamp and position photovoltaic strips. The movable seat 32 has a low position generated by its own gravity and a high position generated by external lifting force at the free end of the connecting segment of each welding strip on the pool sheet. When the movable seat 32 is in the low position, the gripper module 33 can release the gripping of the free end of the connecting segment of the welding strip in each of the clamping positioning spaces 301. When the movable seat 32 is in the high position, the gripper module 33 can clamp the free end of the welding connecting segment in each of the clamping positioning spaces 301.

[0027] In this technical solution, the clamping or unclamping action of each gripper module 33 can be executed by controlling the switching of the height position of the movable seat 32, thereby realizing the clamping and positioning or unclamping of the welding strip. The structure is simple and ensures that the relative position of the welding strip and the battery cell remains unchanged during the movement of the battery cell on the string transport platform, which is conducive to the smooth and reliable attachment of the film strip on the back of the battery cell. At the same time, it is worth emphasizing that the clamping and unclamping action of the aforementioned clamping and positioning space 301 is realized by switching the height position of the movable seat 32, making the action switching simpler.

[0028] In some embodiments, a first elastic element 334 (e.g., a coil spring) is held between the upper ends of the first gripper 331 and the second gripper 332. When the movable seat 32 is in the high position, the gripper module 33 can clamp the free ends of the welded connection sections located within each of the clamping positioning spaces 301 under the action of the first elastic element 334. The aforementioned upper and lower ends are specifically... Figure 1 The directions shown are for reference only.

[0029] In this technical solution, by setting elastic elements on the upper supports of the first gripper 331 and the second gripper 332, the clamping and positioning action of each clamping and positioning space 301 can be realized by relying on the elastic force of the elastic elements when the moving seat 32 is in a low position, making the clamping and positioning of the free ends of each welding strip connection segment more reliable.

[0030] In a preferred embodiment, when the external electromagnetic force applying structure is energized, the movable seat 32 is in the high position; when the electromagnetic force applying structure is de-energized, the movable seat 32 is in the low position. The aforementioned electromagnetic force applying structure is, for example, an electromagnetic coil (also called an electromagnet), which generates electromagnetic force when energized and loses electromagnetic force when de-energized. It can be specifically set at the loading end of the string transport platform. By setting an electrically controllable electromagnetic force applying structure at the loading end of the string transport platform, the working state of the welding strip clamp can be switched by controlling the energization and de-energization of the electromagnetic force applying structure. Before the next battery cell is placed on the string transport platform, the electromagnetic force applying structure is de-energized, thereby making the welding strip clamp in a non-clamping state. This facilitates the smoother alignment of the free end of the welding strip connecting section on the next battery cell within the corresponding clamping and positioning space 301.

[0031] See also Figure 3 and Figure 5 As shown, in some embodiments, drive links 35 are respectively provided at the left and right ends of the press base 31. The drive links 35 are pivotally connected to the press base 31, and the first end of the drive link 35 abuts against and supports the bottom side of the movable seat 32. The second end of the drive link 35 can be attracted by the electromagnetic force applying structure or the permanent magnet and rotate downward around its pivot connection point with the press base 31. The first end and the second end are respectively located on both sides of the pivot connection point, so that the drive link 35 objectively forms a lever structure. While one end is lowered by force, the other end is raised in the opposite direction, thereby realizing the position switching of the movable seat 32 by the electromagnetic force applying structure (or permanent magnet) in a lifting and lowering manner. The structure is simple and reliable. In a specific embodiment, the second end of the aforementioned drive link 35 has a magnetic material (e.g., iron) to ensure that the electromagnetic force applying structure can apply electromagnetic force to it, while other parts of the drive link 35 can be made of non-magnetic materials with small mass, such as high-strength plastic. The aforementioned drive link 35 can specifically be an L-shaped link.

[0032] In some embodiments, guide rods 361 are provided between the two ends of the movable seat 32 and the pressure base 31. A second elastic element 362 (specifically a helical spring) is sleeved on the outer periphery of the guide rod 361. The second elastic element 362 is clamped between the movable seat 32 and the pressure base 31 to ensure smooth position switching (lifting and lowering) of the movable seat 32.

[0033] See details Figure 2As shown, in some embodiments, within the same gripper module 33, a clamping limiting post 335 is provided between the lower ends of the first gripper 331 and the second gripper 332. The clamping limiting post 335 is connected to the press base 31. By reasonably selecting the diameter of the clamping limiting post 335, the mutual distance between the first gripper 331 and the second gripper 332 within the same gripper module 33 when clamping can be adjusted, preventing damage to the welding strip due to excessively small clamping distance and insufficient positioning accuracy of the welding strip due to excessively large clamping distance.

[0034] See further Figure 2 As shown, for the same gripper module 33, the upper ends of the first gripper 331 and the second gripper 332 are inclined structures that extend close to each other. The moving seat 32 has force-applying columns 321 on both sides of the upper end of each gripper module 33. Each force-applying column 321 is arranged to abut against each of the inclined structures. In this way, when the moving seat 32 switches from a high position to a low position under its own weight, the upper ends of the first gripper 331 and the second gripper 332 can be driven to move closer to each other more smoothly. This ensures that the spacing of the aforementioned clamping and positioning spaces 301 is increased, which is conducive to the convenient removal of the welding strip pressure fixture. It also makes it easier for the free end of the welding strip connecting section to be placed in each clamping and positioning space 301.

[0035] In some embodiments, base plates 381 are respectively provided on the bottom surfaces of the left and right ends of the clamping base 31. By selecting base plates 381 of different thicknesses, a gap can be ensured between the bottom surface of the clamping base 31 and the back surface of the battery cell, preventing the welding strip clamp from directly contacting the battery cell and thus reducing the probability of damaging the battery cell during the clamping process. Corresponding positioning grooves 382 are also provided on the bottom surface of the aforementioned base plates 381 to cooperate with the corresponding protruding structures on the left and right sides of the string transport platform, thereby ensuring the accurate positioning of the welding strip clamp.

[0036] According to an embodiment of the present invention, a photovoltaic cell stringing device is also provided, including the above-mentioned welding strip press. Specifically, the photovoltaic cell stringing device further includes a stringing transport platform (not shown in the figure), the stringing transport platform having a loading end on the upstream side of the cell conveying direction and a unloading end on the downstream side of the cell conveying direction, and the electromagnetic force application structure is provided at the loading end.

[0037] In some embodiments, the string transport platform also has an intermediate section between the loading end and the unloading end, and permanent magnets are respectively provided on the left and right sides of the intermediate section. The permanent magnets enable each clamping and positioning space 301 of each welding strip press corresponding to its position to form left and right clamping and positioning of each free end of the welding strip.

[0038] In this technical solution, the welding strip clamp is controlled by a permanent magnet located in the middle section of the string transport platform. This simplifies the structural design, reduces production line design costs, and ensures reliable positioning of the welding strip clamp on the free end of the welding strip connection section during cell transport, preventing the welding strip from shifting position during cell transport. It should be noted that the aforementioned electromagnetic force application structure and the position of the permanent magnet are relatively fixed and do not move with the conveying components of the string transport platform.

[0039] It will be readily understood by those skilled in the art that, without conflict, the advantageous technical features of the above-mentioned methods can be freely combined and superimposed.

[0040] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A solder strip press, characterized by, The press base (31), the moving seat (32) and a plurality of clamping jaw modules (33), each of the clamping jaw modules (33) comprises a first clamping jaw (331) and a second clamping jaw (332) arranged oppositely, both of the first clamping jaw (331) and the second clamping jaw (332) are pivotally connected with the press base (31) through a connecting pin (333), the lower end of each of the first clamping jaw (331) and the second clamping jaw (332) forms a clamping positioning space (301) for clamping and positioning the free end of the connecting section of each solder strip on the photovoltaic cell, the moving seat (32) has a low position generated under its own gravity and a high position generated under the action of external lifting force, when the moving seat (32) is in the low position, the clamping jaw modules (33) can release the clamping of the free end of the solder strip connecting section in each of the clamping positioning spaces (301), when the moving seat (32) is in the high position, the clamping jaw modules (33) can realize the clamping of the free end of the solder connecting section in each of the clamping positioning spaces (301).

2. The solder strip press of claim 1, wherein, The upper end of the first clamping jaw (331) and the second clamping jaw (332) clamps a first elastic member (334), when the moving seat (32) is in the high position, the clamping jaw modules (33) can realize the clamping of the free end of the solder connecting section in each of the clamping positioning spaces (301) under the action of the first elastic member (334).

3. The solder strip press of claim 1, wherein, When the external electromagnetic force applying structure is in the electrified state, the moving seat (32) is in the high position, when the electromagnetic force applying structure is in the de-energized state, the moving seat (32) is in the low position.

4. The solder strip press of claim 3, wherein, The left and right ends of the press base (31) are respectively provided with a driving link (35), the driving link (35) is pivotally connected with the press base (31), the first end of the driving link (35) is abutted and supported on the bottom side of the moving seat (32), the second end of the driving link (35) can be attracted by the electromagnetic force applying structure or the permanent magnet to rotate downward around the pivot connection point of the driving link (35) and the press base (31), the first end and the second end are respectively located on the two sides of the pivot connection point.

5. The solder strip press of claim 1, wherein, The two ends of the moving seat (32) and the press base (31) are provided with a guide rod (361), the outer periphery of the guide rod (361) is sleeved with a second elastic member (362), the second elastic member (362) is clamped between the moving seat (32) and the press base (31).

6. The solder strip press of claim 1, wherein, In the same clamping jaw module (33), the lower end of the first clamping jaw (331) and the second clamping jaw (332) is provided with a clamping limiting column (335), the clamping limiting column (335) is connected to the press base (31).

7. The solder strip press of claim 1, wherein, The upper ends of the first clamping jaw (331) and the second clamping jaw (332) of the same clamping jaw module (33) are inclined structures extending close to each other, and the moving seat (32) has a force applying column (321) on both sides of the upper end of each clamping jaw module (33), and each force applying column (321) is in one-to-one correspondence with each inclined structure.

8. An apparatus for stringing photovoltaic cells, the apparatus comprising: The welding strip holder further comprises the welding strip holder according to claim 3 or 4.

9. The photovoltaic cell stringer device of claim 8, wherein, The string transportation platform further comprises a middle section between the feeding end and the discharging end, and permanent magnets are arranged on the left and right sides of the middle section, so that the clamping and positioning spaces (301) of the welding strip holders correspondingly positioned with the permanent magnets can clamp and position the left and right free ends of the welding strips.

10. The photovoltaic cell stringer device of claim 9, wherein, The string transportation platform further comprises a middle section between the feeding end and the discharging end, and permanent magnets are arranged on the left and right sides of the middle section, so that the clamping and positioning spaces (301) of the welding strip holders correspondingly positioned with the permanent magnets can clamp and position the left and right free ends of the welding strips.

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