Welding strip positioning mechanism of series welding machine

Abstract

The utility model provides a welding strip positioning mechanism of a series welding machine. The welding strip positioning mechanism is used for positioning a welding strip on the surface of a battery piece during series welding. The surface of the battery piece is provided with a plurality of thin grid lines and a plurality of welding strips vertical to the thin grid lines; the welding strip positioning mechanism of the series welding machine comprises a supporting assembly and a plurality of pressing needles arranged on the supporting assembly in a matrix mode, the supporting assembly comprises a plurality of supporting beams arranged side by side and a connecting beam connecting the supporting beams, and the pressing needles are elastically arranged on the supporting beams through elastic pieces. The length direction of the supporting beams is perpendicular to the length direction of the welding strip, the pressing needles on the two supporting beams located on the edges are defined as first pressing needles, the pressing needles on the supporting beams located inside are defined as second pressing needles, and the contact area of the end face of each first pressing needle and the welding strip is larger than the contact area of the end face of each second pressing needle and the welding strip. The elastic force between the first pressing needle and the supporting beam is larger than the elastic force between the second pressing needle and the supporting beam.

Description

Technical Field

[0001] The utility model relates to the field of solar cell welding, in particular to a welding ribbon positioning mechanism of a string welding machine. Background Art

[0002] In the production of photovoltaic modules, stringers are key equipment used to connect multiple solar cells using solder ribbons. Traditional stringers often encounter operational issues, such as missing solder joints at the beginning and end of the ribbons and ribbon bending. These issues severely impact weld quality and the power generation efficiency and reliability of the final product.

[0003] Therefore, it is necessary to design a welding ribbon positioning mechanism for a string welding machine to solve the above problems. Utility Model Content

[0004] The utility model aims to provide a welding strip positioning mechanism for a string welding machine, which can prevent empty welding at the head and tail of the welding strip, bending of the welding strip, etc.

[0005] To achieve the above-mentioned purpose, the present invention adopts the following technical solutions: a welding ribbon positioning mechanism of a string welding machine, which is used to position the welding ribbon on the surface of a battery cell during string welding; the surface of the battery cell has multiple fine grid lines and multiple welding ribbons perpendicular to the fine grid lines; the welding ribbon positioning mechanism of the string welding machine includes a support assembly and multiple pressure pins arranged in a matrix on the support assembly, the support assembly includes multiple support beams arranged side by side and connecting beams connecting the support beams, the pressure pins are elastically arranged on the support beams through elastic parts, the length direction of the support beams is perpendicular to the length direction of the welding ribbon, the pressure pins on the two support beams located on the edge are defined as first pressure pins, and the pressure pins on the inner support beams are defined as second pressure pins, the area of ​​contact between the end face of the first pressure pin and the welding ribbon is larger than the area of ​​contact between the end face of the second pressure pin and the welding ribbon, and the elastic force between the first pressure pin and the support beam is larger than the elastic force between the second pressure pin and the support beam.

[0006] As a further improved technical solution of the present invention, the contact area between the first pressure needle and the soldering strip is 2-4 times the contact area between the second pressure needle and the soldering strip.

[0007] As a further improved technical solution of the present invention, the elastic member is a spring, and the elastic coefficient of the spring of the first pressing needle is 0.3-0.8 N / m greater than the elastic coefficient of the spring of the second pressing needle.

[0008] As a further improved technical solution of the present invention, when the soldering ribbon positioning mechanism of the stringer is placed on the surface of the battery cell, the edge of the first pressing pin is 0.5-1.5 mm away from its nearest welding point.

[0009] As a further improved technical solution of the present invention, the end surface of the first pressing needle is circular, and its diameter is 5-8 mm; the end surface of the second pressing needle is circular, and its diameter is 3-5 mm.

[0010] As a further improved technical solution of the present invention, the end face of the first pressing needle is a curved surface, and the curvature radius thereof is 100-200 mm.

[0011] As a further improved technical solution of the present invention, the end surface of the second pressing needle is a plane.

[0012] It can be seen from the above technical solution that the soldering tape positioning mechanism of the string soldering machine of the utility model ensures the correct positioning of the soldering tape during the string soldering process by adopting a support assembly and a plurality of matrix-arranged pressure pins, wherein the support assembly is composed of a support beam and a connecting beam arranged side by side, and the pressure pin is elastically installed on the support beam through an elastic member. Through the differential design of the first pressure pin and the second pressure pin, that is, the first pressure pin located on the edge support beam has a larger contact area with the soldering tape and a stronger elastic force, while the second pressure pin located on the internal support beam has a smaller contact area and a relatively weaker elastic force. This differentiated design can better adapt to the positioning requirements of soldering tapes in different parts, effectively prevent the occurrence of empty welding and bending, thereby improving the overall welding stability and product quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 Schematic top view of a soldering ribbon positioning mechanism of a string soldering machine according to an embodiment of the present invention.

[0014] Figure 2 for Figure 1 Diagram of the relationship between the middle welding ribbon positioning mechanism and the position of the battery cell.

[0015] Figure 3 for Figure 1 A three-dimensional view of the first indenter. DETAILED DESCRIPTION

[0016] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0017] Please refer to Figure 1 and Figure 2 As shown, the present invention provides a welding ribbon positioning mechanism 100 for a string welding machine, which is used to position the welding ribbon on the surface of a battery cell 200 during string welding. The surface of the battery cell 200 has a plurality of fine grid lines and a plurality of welding ribbons perpendicular to the fine grid lines ( Figure 2 (indicated by the medium-thick dashed line).

[0018] The soldering machine's ribbon positioning mechanism 100 includes a support assembly 10 and a plurality of press pins 20 arranged in a matrix. Specifically, the support assembly 10 comprises a plurality of support beams 11 arranged side by side and connecting beams 12 connecting the support beams 11. The length of the support beams 11 is perpendicular to the length of the soldering ribbon. The support assembly 10 is constructed of high-strength, high-temperature-resistant materials, ensuring continued stability and reliability over long-term use.

[0019] The pressure pin 20 is elastically mounted on the support beam 11 through an elastic member. The pressure pins on the two support beams 11 at the edge are defined as the first pressure pin 21, and the pressure pin on the inner support beam 11 is defined as the second pressure pin 22. The area of ​​contact between the end face of the first pressure pin 21 and the soldering strip is larger than the area of ​​contact between the end face of the second pressure pin 22 and the soldering strip. The elastic force between the first pressure pin 21 and the support beam 11 is larger than the elastic force between the second pressure pin 22 and the support beam 11. Figure 3 As shown, the pressing needle 20 specifically includes a mounting post 201 , a spring 202 and a pressing head 203 . The pressing head 203 is elastically mounted on the mounting post 201 via the spring 202 , and the mounting post 201 is fixed to the support beam 11 .

[0020] The area of ​​contact between the first pressing needle 21 and the soldering ribbon is 2-4 times the area of ​​contact between the second pressing needle 22 and the soldering ribbon. The end face of the first pressing needle 21 is circular, and its diameter is 5-8mm, and the end face of the second pressing needle 22 is circular, and its diameter is 3-5mm. Specifically, in this embodiment, the pressure head of the first pressing needle 21 is circular, and its diameter is 6mm, and the pressure head of the second pressing needle 22 is circular, and its diameter is 4mm. The elastic coefficient of the spring of the first pressing needle 21 is 0.3-0.8N / m greater than the elastic coefficient of the spring of the second pressing needle 22. Such a setting further improves the fixing ability of the first pressing needle to the soldering ribbon, but avoids the increase of elastic force causing hidden cracks in the battery cell.

[0021] Preferably, the end face of the first pressing needle 21 is a curved surface with a curvature radius of 100-200 mm. The end face of the second pressing needle 22 is a flat surface, which is conducive to better contact between the pressing needle and the cell surface during welding and improves welding quality.

[0022] During welding, the stringer's ribbon positioning mechanism 100 is placed on the surface of the cell 200. The support beam 11 and the ribbon's welding points are staggered, with the edge of the first pressure pin 21 positioned 0.5-1.5mm from the nearest welding point. Each ribbon is secured at both ends by a first pressure pin 21. The large-diameter pressure pins 21 provide better pressure and stability, controlling the stress caused by thermal expansion. This prevents problems such as empty solder joints and "S" bends at the beginning and end of the cell.

[0023] The terms used herein to indicate spatial relative positions are used for ease of explanation to describe the relationship of one feature relative to another feature as shown in the accompanying drawings. It should be understood that, depending on the placement of the product, these terms may be intended to encompass different orientations besides those shown in the drawings and should not be construed as limitations on the claims.

[0024] In addition, the above embodiments are only used to illustrate the present invention and are not intended to limit the technical solutions described in the present invention. The understanding of this specification should be based on technical personnel in the relevant technical field. Although this specification has described the present invention in detail with reference to the above embodiments, ordinary technical personnel in this field should understand that technical personnel in the relevant technical field can still modify or replace the present invention with equivalents, and all technical solutions and improvements that do not depart from the spirit and scope of the present invention should be covered by the scope of the claims of the present invention.

Claims

1. A soldering ribbon positioning mechanism for a stringer, used to position the soldering ribbon on the surface of a cell during string soldering; the cell surface has a plurality of fine grid lines and a plurality of soldering ribbons perpendicular to the fine grid lines; characterized in that: The soldering tape positioning mechanism of the string soldering machine includes a support assembly and a plurality of press pins arranged in a matrix on the support assembly. The support assembly includes a plurality of support beams arranged side by side and a connecting beam connecting the support beams. The press pins are elastically arranged on the support beams through elastic parts. The length direction of the support beams is perpendicular to the length direction of the soldering tape. The press pins on the two support beams located on the edge are defined as first press pins, and the press pins on the inner support beam are defined as second press pins. The area in which the end face of the first press pin contacts the soldering tape is larger than the area in which the end face of the second press pin contacts the soldering tape. The elastic force between the first press pin and the support beam is larger than the elastic force between the second press pin and the support beam.

2. The soldering ribbon positioning mechanism of the stringer according to claim 1, wherein: The contact area between the first pressing needle and the soldering ribbon is 2-4 times the contact area between the second pressing needle and the soldering ribbon.

3. The welding ribbon positioning mechanism of the stringer according to claim 1, characterized in that: The elastic member is a spring, and the elastic coefficient of the spring of the first pressing needle is 0.3-0.8 N / m greater than the elastic coefficient of the spring of the second pressing needle.

4. The welding ribbon positioning mechanism of the stringer according to claim 1, characterized in that: When the soldering ribbon positioning mechanism of the stringer is placed on the surface of the battery cell, the edge of the first pressing pin is 0.5-1.5 mm away from the nearest soldering point.

5. The soldering ribbon positioning mechanism of the stringer according to claim 1, wherein: The end surface of the first pressing needle is circular, and its diameter is 5-8 mm; the end surface of the second pressing needle is circular, and its diameter is 3-5 mm.

6. The soldering ribbon positioning mechanism of the stringer according to claim 1, wherein: The end surface of the first pressing needle is a curved surface, and the curvature radius thereof is 100-200 mm.

7. The soldering ribbon positioning mechanism of the stringer according to claim 1, wherein: The end surface of the second pressing needle is a plane.

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