Lower module ejector pin device of series welding machine

Abstract

The utility model relates to a lower module ejector pin device of a series welding machine, and belongs to the technical field of solar cell manufacturing. The lower module ejector pin device comprises a base, a plurality of spring sets and a plurality of ejector pin sets. By arranging a plurality of spring sets and installing a plurality of ejector pins in through holes through springs, when the ejector pins abut against a bonding pad, the springs can enable a solar cell to have a certain movement allowance in the welding process, and the situation that the solar cell is damaged due to the fact that stress on the solar cell is too concentrated and stiff is avoided; compared with the prior art, the plurality of groups of thimbles are arranged on the base at non-uniform intervals, so that the solar cell welding jig can be compatible with solar cells with different bonding pad numbers, the overlapping area of the thimbles and a plurality of bonding pads on the solar cells with different bonding pad numbers is enlarged during welding, effective support is provided for the plurality of bonding pads, and the welding quality of the solar cells is improved. Therefore, poor phenomena such as pseudo soldering and soldering point position deviation of the solar cell are reduced, and the qualified rate of the solar cell is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of solar cell manufacturing, in particular to a lower module ejector device of a string welding machine. Background Art

[0002] During the automatic string welding process of solar cells, the complete solar cell is divided into two welding processes, each time welding half of the solar cell. Since the back electrode printing pattern of the solar cell is divided into eight segments and twelve segments, the eight-segment solar cell has eight welding pads, and the twelve-segment solar cell has twelve welding pads; therefore, when welding the eight-segment solar cell, four of the welding pads need to abut against and overlap with the multiple ejector pins in the lower module ejector pin device of the string welding machine, and when welding the twelve-segment solar cell, six of the welding pads also need to abut against and overlap with the multiple ejector pins in the lower module ejector pin device of the string welding machine.

[0003] like Figure 1 and Figure 2 As shown, the lower mold ejector device of the existing stringer includes a base 1 and eight groups of ejector pins fixed on the top surface of the base 1. The eight groups of ejector pins are evenly spaced and parallel to each other. Each group of ejector pins includes two ejector pins 3. The two ejector pins 3 are symmetrically fixed on the front and rear sides of the top surface of the base 1. The top ends of the eight ejector pins 3 located in the same vertical plane are respectively used to abut against multiple welding pads 4 of the solar cell.

[0004] The lower module ejector device of the above-mentioned stringer has the following problems during the welding process: when the eight ejector pins 3 located on the vertical plane coincide with the positions of the four pads 4, the positions of the six pads 4 cannot be compatible, resulting in the inability to effectively support the six pads 4, and undesirable phenomena such as cold soldering and position offset of welding points often occur, resulting in a decrease in the overall production efficiency of the stringer and the qualified rate of the products, and a reduction in the overall investment in solar cell panels. Utility Model Content

[0005] In order to solve the above technical problems, the utility model provides a lower die ejector device for a string welding machine. The technical solution of the utility model is as follows:

[0006] A lower module ejector device for a stringer, the stringer comprising a plurality of groups of the lower module ejector devices, the plurality of groups of the lower module ejector devices being respectively fixed in a plurality of grooves of a platform of the stringer, each group of the lower module ejector devices comprising a base, a plurality of groups of spring groups and a plurality of groups of ejector pins, the base being fixed in one of the grooves of the platform of the stringer, a plurality of groups of through hole groups being unevenly arranged on the top surface of the base, the plurality of groups of through hole groups being parallel to each other, each group of the through hole groups comprising two through holes, each group of the spring groups comprising two springs, each group of the ejector pin groups comprising two ejector pins, the bottom ends of the springs being fixed in the through holes, the top ends of the springs being connected to the bottom ends of the ejector pins; the two through holes of each group of the through hole groups being symmetrically arranged on the front and rear sides of the top surface of the base, the top ends of the plurality of the ejector pins located in the same vertical plane being respectively used for abutting against a plurality of welding pads of a solar cell.

[0007] Optionally, the number of the spring groups, the number of the ejector pin groups, and the number of the through hole groups are all nine.

[0008] Optionally, the center spacings of the nine ejector pins located in the same vertical plane are 6mm, 6mm, 10mm, 4mm, 14mm, 4mm, 10mm, and 14mm from left to right, respectively; the spacing between the center of the ejector pin located on the leftmost side of the top surface of the base and the left side surface of the base is 10mm; the spacing between the center of the ejector pin located on the rightmost side of the top surface of the base and the right side surface of the base is 10mm.

[0009] Optionally, the base has a size of 88 mm×22 mm×12 mm.

[0010] Optionally, the ejector pin is made of ceramic.

[0011] All the optional technical solutions mentioned above can be combined arbitrarily, and the present utility model does not provide detailed descriptions of the structures after the combinations one by one.

[0012] By means of the above scheme, the beneficial effects of the utility model are as follows:

[0013] A base, multiple spring groups and multiple ejector groups are provided, and multiple through-hole groups are provided at uneven intervals on the top surface of the base. Multiple ejector pins are installed in the through-holes through springs, so that when the ejector pins abut against the welding pads, the springs can allow the solar cell to have a certain amount of activity margin during the welding process, thereby preventing the solar cell from being damaged due to excessive concentrated and rigid force. Multiple through-holes are symmetrically distributed on the front and back sides of the top surface of the base, so that multiple ejector pins close to the front side of the base are located in the same vertical plane, and multiple ejector pins close to the rear side of the base are located in the same vertical plane. During welding, the top ends of the multiple ejector pins are aligned with the top of the solar cell. The abutting positions of multiple pads will not be skewed to ensure the accuracy of welding; compared with the prior art in which eight groups of ejector pins are evenly installed on the base, the utility model can be compatible with solar cells with different numbers of pads by arranging multiple groups of ejector pins with uneven intervals installed on the base, so that the overlapping area of ​​the ejector pins and multiple pads on solar cells with different numbers of pads is expanded during welding, and then effective support can be provided for multiple pads during the welding process, thereby reducing the adverse phenomena of cold soldering and welding point position deviation of solar cells, and improving the overall production efficiency of the string welding machine and the qualified rate of solar cells.

[0014] The above description is only an overview of the technical solution of the utility model. In order to more clearly understand the technical means of the utility model and implement it according to the contents of the specification, the following is a detailed description of the preferred embodiments of the utility model in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the position relationship between eight ejector pins and four pads in the prior art;

[0016] Figure 2 It is a schematic diagram of the position relationship between eight ejector pins and six pads in the prior art;

[0017] Figure 3 It is a schematic diagram of the structure of the utility model;

[0018] Figure 4 It is a schematic diagram of the position relationship between nine ejector pins and four pads in the utility model;

[0019] Figure 5 It is a schematic diagram of the position relationship between nine ejector pins and six solder pads in the utility model.

[0020] Description of Figure Numbers:

[0021] 1. Base; 2. Spring; 3. Ejector pin; 4. Soldering pad. DETAILED DESCRIPTION

[0022] The following is a further detailed description of the specific implementation of the present invention in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0023] like Figures 3 to 5 As shown, the utility model provides a lower module ejector device of a stringer, the stringer includes multiple groups of the lower module ejector devices, the multiple groups of the lower module ejector devices are respectively fixed in multiple grooves of the platform of the stringer, each group of the lower module ejector devices includes a base 1, multiple groups of spring groups and multiple groups of ejector groups, the base 1 is fixed in one of the grooves of the platform of the stringer, the top surface of the base 1 is unevenly spaced to open multiple groups of through hole groups, the multiple groups of through hole groups are parallel to each other, each group of the through hole group includes two through holes, each group of the spring group includes two springs 2, each group of the ejector group includes two ejector pins 3, the bottom end of the spring 2 is fixed in the through hole, the top end of the spring 2 is connected to the bottom end of the ejector pin 3; the two through holes of each group of the through hole group are symmetrically opened on the front and rear sides of the top surface of the base 1, and the top ends of the multiple ejector pins 3 located in the same vertical plane are respectively used to abut against multiple pads 4 of the solar cell.

[0024] In a specific implementation, a driving motor is provided under the platform of the stringer, and the driving motor can drive the base 1 to rise and fall in the groove, and the position where the multiple groups of lower module ejector devices are fixed on the platform of the stringer is the welding position of the stringer; when there is no solar cell transported to the welding position, the driving motor remains in a stopped state, and the multiple bases 1 are located in the multiple grooves, so that the multiple ejector pins 3 on the base 1 are also located in the grooves; when the solar cell to be welded is transported to the welding position, the driving motor is started, and the multiple bases 1 are simultaneously lifted up from the grooves, so that the top ends of the multiple ejector pins 3 on the base 1 abut against the multiple welding pads 4 of the solar cell.

[0025] The ejector pin 3 is fixed in the through hole by the spring 2, and the spring 2 can make the solar cell have a certain margin of activity during the welding process, so as to avoid the situation that the solar cell is damaged due to excessive concentrated and stiff force; the multiple through holes are symmetrically distributed on the front and rear sides of the top surface of the base 1, so that the multiple ejector pins 3 close to the front side of the base 1 are located in the same vertical plane, and the multiple ejector pins 3 close to the rear side of the base 1 are located in the same vertical plane. During welding, the top ends of the multiple ejector pins 3 and the abutting positions of the multiple welding pads 4 on the solar cell will not be skewed to ensure the accuracy of welding; compared with the prior art in which eight groups of ejector pins are evenly installed on the base 1, the utility model can be compatible with solar cells with different numbers of welding pads 4 by arranging multiple groups of ejector pins to be unevenly installed on the base 1, so that the overlapping area of ​​the ejector pin 3 and the multiple welding pads 4 on the solar cell with different numbers of welding pads 4 is expanded during welding, and then the multiple welding pads 4 can be provided with effective support during the welding process, thereby reducing the undesirable phenomena such as cold welding and welding point position deviation of the solar cell, and improving the overall production efficiency of the string welding machine and the qualified rate of the solar cell.

[0026] Optionally, the number of the spring groups, the number of the ejector pin groups, and the number of the through hole groups are all nine.

[0027] Specifically, the number of spring groups, the number of ejector pin groups, and the number of through-hole groups can be determined according to the number of pads 4 on the solar cell used. Since the utility model needs to be compatible with eight-segment solar cells and twelve-segment solar cells, the number of spring groups, the number of ejector pin groups, and the number of through-hole groups in the utility model are preferably set to nine groups.

[0028] Optionally, when the number of spring groups, the number of ejector pin groups and the number of through hole groups are nine groups, the center spacings of the nine ejector pins 3 located in the same vertical plane are 6 mm, 6 mm, 10 mm, 4 mm, 14 mm, 4 mm, 10 mm and 14 mm from left to right, respectively; the spacing between the center of the ejector pin 3 located on the leftmost side of the top surface of the base 1 and the left side surface of the base 1 is 10 mm; the spacing between the center of the ejector pin 3 located on the rightmost side of the top surface of the base 1 and the right side surface of the base 1 is 10 mm.

[0029] It should be noted that the center spacing of the nine ejector pins 3 in the present invention can be adjusted according to the center spacing between two adjacent pads 4 on the solar cell. The above center spacing dimensions are obtained by technicians after multiple on-site welding experiments of eight-segment solar cells and twelve-segment solar cells.

[0030] Optionally, the size of the base 1 is 88 mm×22 mm×12 mm. Specifically, the size of the base 1 in the present invention can be adjusted according to the size of the multiple grooves on the stringer platform.

[0031] Optionally, the material of the ejector pin 3 is ceramic. The ejector pin 3 made of ceramic has a high melting point and good wear resistance, which can reduce the replacement frequency of the ejector pin 3 and reduce production costs.

[0032] In summary, the lower module ejector device provided by the utility model, by arranging multiple springs 2, allows the solar cell to have a margin of activity during the welding process, thereby avoiding the situation where the solar cell is subjected to concentrated force and is damaged during the welding process; by arranging multiple ejector pins 3 with uneven intervals, the purpose of being compatible with solar cells with different numbers of welding pads 4 is achieved, thereby reducing the time for debugging the ejector pin 3 during the welding process, improving the welding efficiency, and reducing the probability of adverse conditions such as cold welding of the solar cell pad 4 and position deviation of the welding point, thereby improving the qualified rate of the solar cell; by arranging a ceramic ejector pin 3, the service life of the ejector pin 3 can be extended, the replacement frequency of the ejector pin 3 can be reduced, thereby reducing the production cost.

[0033] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. It should be pointed out that a person skilled in the art can make several improvements and modifications without departing from the technical principle of the present invention, and these improvements and modifications should also be regarded as within the protection scope of the present invention.

Claims

1. A lower die ejector device for a string welding machine, characterized in that: The stringer includes a plurality of groups of lower die ejector devices, which are respectively fixed in a plurality of grooves of the platform of the stringer, and each group of the lower die ejector devices includes: A base (1), a plurality of spring groups and a plurality of ejector pin groups, wherein the base (1) is fixed in one of the grooves of the string welding machine platform, a plurality of through hole groups are unevenly arranged on the top surface of the base (1), the plurality of through hole groups are parallel to each other, each through hole group includes two through holes, each spring group includes two springs (2), each ejector pin group includes two ejector pins (3), the bottom end of the spring (2) is fixed in the through hole, and the top end of the spring (2) is connected to the bottom end of the ejector pin (3); The two through holes of each through hole group are symmetrically arranged on the front and rear sides of the top surface of the base (1), and the top ends of the plurality of ejector pins (3) located in the same vertical plane are respectively used to abut against the plurality of solder pads (4) of the solar cell sheet.

2. The lower die ejector device of a string welding machine according to claim 1, characterized in that: The number of the spring groups, the number of the ejector pin groups, and the number of the through hole groups are all nine.

3. The lower die ejector device of a string welding machine according to claim 2, characterized in that: The center spacings of the nine ejector pins (3) located in the same vertical plane are 6 mm, 6 mm, 10 mm, 4 mm, 14 mm, 4 mm, 10 mm, and 14 mm from left to right, respectively; the spacing between the center of the ejector pin (3) located on the leftmost side of the top surface of the base (1) and the left side surface of the base (1) is 10 mm; and the spacing between the center of the ejector pin (3) located on the rightmost side of the top surface of the base (1) and the right side surface of the base (1) is 10 mm.

4. The lower die ejector device of a string welding machine according to claim 3, characterized in that: The size of the base (1) is 88 mm×22 mm×12 mm.

5. The lower die ejector device of a string welding machine according to claim 1, characterized in that: The material of the ejector pin (3) is ceramic.

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