CN219286429U

CN219286429U - Arched sectional welding strip

Info

Publication number: CN219286429U
Application number: CN202320214481.0U
Authority: CN
Inventors: 程中广; 闵耀焰
Original assignee: Wuxi Sveck Technology Co ltd
Current assignee: Wuxi Sveck Technology Co ltd
Priority date: 2023-02-15
Filing date: 2023-02-15
Publication date: 2023-06-30
Anticipated expiration: 2033-02-15

Abstract

The utility model provides an arch-shaped segmented solder strip, comprising: the welding strip comprises a welding strip body, wherein the welding strip body comprises a plurality of periodic welding strip sections, and each periodic welding strip section comprises an arch section, a transition section and a flat section; the arch section is used for being welded on the front surface of the battery piece, the flat section is used for being welded on the back surface of the battery piece, one end of the transition section is connected with the arch section, and the other end of the transition section is connected with the flat section; the bottom surface of the arch section is a plane, and more than the bottom surface of the arch section is a circular arch; the section of the flat section is flat. The utility model solves the problems that the contact area of the round copper base and the silver paste grid line is small, and further, larger resistance is generated, and adverse effect is generated on current transmission.

Description

Arched sectional welding strip

Technical Field

The utility model relates to an arch-shaped segmented welding strip, and belongs to the technical field of photovoltaic welding strips.

Background

The sectional welding strip is an upgrading type of the MBB welding strip and is characterized in that the welding strip is formed by periodically alternately arranging round sections and flat sections, wherein the round sections are welded on the front surface of the battery piece, and the proportion of the shading area of the battery piece can be reduced due to the small projection area of the round sections; and the flat section part is welded on the back of the battery piece, and the thickness of packaging materials such as EVA (ethylene vinyl acetate) on the back can be reduced due to the small thickness of the flat section part, so that the material cost is reduced. Compared with the conventional MBB circular welding strip, the sectional welding strip has the advantage of reducing the assembly cost.

The more significant drawbacks are: 1. the contact area between the round copper base and the silver paste grid line is small, most of current flow routes are battery pieces, the silver paste grid line, a solder layer and the copper base, and as the resistance of tin-lead solder is far greater than that of copper, the contact surface with too few contact surfaces can generate larger resistance, and the current transmission is affected to a certain extent; 2. the situation that more packaging materials are consumed still exists on the front surface; 3. the transition parts of the round section and the flat section are thicker, more avoidance space is still needed to eliminate the stress of the welding strip on the edge of the battery piece during welding, and the interval between the battery pieces is relatively larger.

Disclosure of Invention

Aiming at the defects in the prior art, the embodiment of the utility model provides an arch-shaped sectional welding strip, which solves the problems that the contact area of a round copper base and a silver paste grid line is small, and further, larger resistance is generated, and adverse effect is generated on current transmission.

In order to achieve the technical purpose, the technical scheme adopted by the embodiment of the utility model is as follows:

an arcuate segmented solder strip comprising: the welding strip comprises a welding strip body, wherein the welding strip body comprises a plurality of periodic welding strip sections, and each periodic welding strip section comprises an arch section, a transition section and a flat section; the arch section is used for being welded on the front surface of the battery piece, the flat section is used for being welded on the back surface of the battery piece, one end of the transition section is connected with the arch section, and the other end of the transition section is connected with the flat section;

the bottom surface of the arch section is a plane, and more than the bottom surface of the arch section is a circular arch;

the section of the flat section is flat.

Further, the width of the transition section gradually widens from the flat section to the arch section, and then gradually narrows; the width L2 of the widest part of the transition section is larger than the width L1 of the flat section.

Further, the thickness H2 of the transition section is smaller than the flat section thickness H1.

Further, 1/2 phi A is less than or equal to H3 and less than or equal to phi A; and phi A is the diameter of a circle corresponding to the section of the arch segment, and H3 is the thickness of the arch segment.

Further, the width of the arch segment is smaller than the width L1 of the flat segment.

The technical scheme provided by the embodiment of the utility model has the beneficial effects that:

1. the plane at the bottom of the arch section can be fully contacted with the silver paste electrode, so that the electric energy loss caused by the resistance of the solder is greatly reduced. Meanwhile, the reflection function of the circular welding strip on the incident light is also reserved. Meanwhile, the arch height is lower than that of a round shape under the same diameter, so that the thickness of the front packaging material can be reduced, and the material cost is reduced.

2. The thickness of the transition section is reduced, so that the distance between the battery pieces can be reduced, and the effective power generation area of the assembly is improved.

Drawings

Fig. 1 is a top view of an embodiment of the present utility model.

Fig. 2 is a side view of an embodiment of the present utility model.

FIG. 3a is a schematic view of different thicknesses of arch segments according to an embodiment of the present utility model.

FIG. 3b is a schematic view of different thicknesses of arch segments according to an embodiment of the present utility model.

FIG. 3c is a schematic view of different thicknesses of arch segments according to an embodiment of the present utility model.

Fig. 4 is a state diagram of use in an embodiment of the present utility model.

Detailed Description

The present utility model will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present utility model more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the utility model.

As shown in fig. 1 and 4, the utility model provides an arch-shaped segmented welding strip, which comprises a welding strip body, wherein the welding strip body comprises a plurality of periodic welding strip sections, and each periodic welding strip section comprises an arch section 1, a transition section 2 and a flat section 3; the arch segment 1 is used for being welded on the front surface of the battery piece, the flat segment 3 is used for being welded on the back surface of the battery piece, one end of the transition segment 2 is connected with the arch segment 1, and the other end is connected with the flat segment 3.

As shown in fig. 3a, the bottom surface of the arch segment 1 is a plane, more than the bottom surface of the arch segment 1 is a circular arch, and the section of the arch segment 1 is a flat arch. The bottom of the arch section 1 can have larger contact area with the silver paste grid line due to the design of the flat bottom arch, and meanwhile, the thickness of the front packaging material can be reduced due to the fact that the height of the welding strip is reduced, so that cost reduction is achieved.

The section of the flat section 3 is flat.

As shown in fig. 1, as a further optimization of the present embodiment, the width of the transition section 2 gradually widens from the flat section 3 toward the arch section 1, and then gradually narrows; the width L2 of the widest part of the transition section 2 is larger than the width L1 of the flat section 3, so that the shape change of the transition section 2 is relatively gentle, and stress concentration is avoided.

As a further refinement of the present embodiment, as shown in fig. 1, the width of the arch segment 1 is smaller than the width L1 of the flat segment 3; the smaller width of the arch segment 1 can reduce the shading area proportion of the battery piece.

As a further refinement of the present embodiment, the thickness H2 of the transition section 2 is smaller than the thickness H1 of the flat section 3, as shown in fig. 2. As the thickness of the transition section 2 becomes thinner, the smaller the space required at the time of bending, the further the gap between the battery pieces can be reduced.

As a further optimization of this embodiment, 1/2. Phi. A.ltoreq.H2.ltoreq.Ph3. Phi. A. Wherein ΦA is the diameter of a circle corresponding to the section of the arch segment 1, and H3 is the thickness of the arch segment 1. As shown in fig. 3a, 3b and 3c, the arch section 1 can be partially pressed into arches with different heights by specially designed pressing rollers, and specific specifications can be customized according to the characteristics of the battery piece and the requirements of customers. The design has the advantages that the plane at the bottom of the arch section 1 can be fully contacted with the silver paste electrode, and the electric energy loss caused by the resistance of the solder is greatly reduced. Meanwhile, the reflection function of the circular welding strip on the incident light is also reserved. Meanwhile, the arch height is lower than that of a round shape under the same diameter, so that the thickness of the front packaging material can be reduced, and the material cost is reduced.

Finally, it should be noted that the above-mentioned embodiments are only for illustrating the technical solution of the present utility model, and not for limiting the same, and although the present utility model has been described in detail with reference to examples, it should be understood by those skilled in the art that modifications and equivalents may be made to the technical solution of the present utility model without departing from the spirit and scope of the technical solution of the present utility model, and all such modifications and equivalents are intended to be encompassed in the scope of the claims of the present utility model.

Claims

1. An arcuate segment weld bead, comprising: the welding strip comprises a welding strip body, wherein the welding strip body comprises a plurality of periodic welding strip sections, and each periodic welding strip section comprises an arch section (1), a transition section (2) and a flat section (3); the arch section (1) is used for being welded on the front surface of the battery piece, the flat section (3) is used for being welded on the back surface of the battery piece, one end of the transition section (2) is connected with the arch section (1), and the other end of the transition section is connected with the flat section (3);

the bottom surface of the arch section (1) is a plane, and more than the bottom surface of the arch section (1) is a circular arch;

the section of the flat section (3) is flat.

2. The arch-shaped segmented solder strip of claim 1, wherein the width of the transition section (2) gradually widens from the flat section (3) toward the arch section (1) and then gradually narrows; the width L2 of the widest part of the transition section (2) is larger than the width L1 of the flat section (3).

3. The arcuate segment weld of claim 1, wherein the thickness H2 of the transition section (2) is less than the thickness H1 of the flat section (3).

4. The arcuate segment weld of claim 1 wherein 1/2 Φa is equal to or less than H3 is equal to or less than Φa; the phi A is the diameter of a circle corresponding to the section of the arch segment (1), and the H3 is the thickness of the arch segment (1).

5. The arch-shaped segmented solder strip of claim 1, wherein the width of the arch segments (1) is smaller than the width L1 of the flat segments (3).