CN213636010U

CN213636010U - Photovoltaic solder strip for connecting battery pack

Info

Publication number: CN213636010U
Application number: CN202022512564.7U
Authority: CN
Inventors: 王海超; 姚猛; 林中亚; 薛康
Original assignee: Shanxi Luan Solar Energy Technology Co Ltd
Current assignee: Shanxi Luan Solar Energy Technology Co Ltd
Priority date: 2020-11-04
Filing date: 2020-11-04
Publication date: 2021-07-06
Anticipated expiration: 2030-11-04

Abstract

The utility model belongs to the field of solar cells, in particular to a photovoltaic welding strip for connecting a cell module, which is a cross-shaped strip with uneven thickness and width and comprises a welding zone and a connecting zone, wherein the welding zone is positioned at two ends of the welding strip and is connected with cell pieces, and the connecting zone is positioned at the middle gap of the connected cell pieces; wherein, the thickness of said connecting region is higher than the thickness of said welding region, the width of said connecting region is greater than the width of welding region. The utility model discloses increasing the width and the thickness that are located the welding strip of battery piece clearance position under the crooked prerequisite of laminating that does not influence welding strip and battery contact position, the increase current transmission that can be obvious reduces the cluster and hinders, can increase the subassembly electric current through increasing sensitive area and reflectivity simultaneously.

Description

Photovoltaic solder strip for connecting battery pack

Technical Field

The utility model belongs to the solar cell field, concretely relates to connect battery pack's photovoltaic solder strip.

Background

The photovoltaic solder strip is also called a tinned copper strip or a tinned copper strip, is divided into an interconnection strip and a bus bar and is used for linking photovoltaic module cells. The solder strip is an important raw material in the welding process of the photovoltaic module, the quality of the solder strip directly affects the current collection efficiency of the photovoltaic module, and the power of the module is greatly affected. When the solder strip is selected, the state of the solder strip is determined according to the characteristics of the battery cell. The generally selected standard is to determine the thickness of the welding strip according to the thickness of the battery piece and the short-circuit current, and the width of the welding strip is consistent with the width of the main grid of the battery.

The too thin solder strip can lead to metal resistance being bigger, the too thick solder strip can lead to bending difficulty and even lamination fragments, the too narrow solder strip can lead to metal resistance being bigger, the pulling force is little, the too wide solder strip can block the photic area of battery piece.

When adjacent batteries are interconnected, the external contact resistor consists of a silver electrode resistor and a solder strip body resistor at the battery piece end, the resistor at the middle section only has the solder strip body resistor, and the cross-sectional area through which the current at the middle section passes is smaller than that at the two ends, so that the current transmission bottleneck is formed. Therefore the utility model discloses a connect photovoltaic solder strip that battery pack has uneven width and thickness distribution.

SUMMERY OF THE UTILITY MODEL

To the above problem, the utility model provides a connect battery pack's photovoltaic solder strip.

Realize above-mentioned technical purpose, reach above-mentioned technological effect, the utility model discloses a following technical scheme realizes:

a photovoltaic solder strip for connecting a battery pack is a cross-shaped strip with uneven thickness and width, and comprises a solder area and a connecting area, wherein the solder area is positioned at two ends of the solder strip and connected with battery pieces, and the connecting area is positioned in a middle gap of the connected battery pieces; wherein, the thickness of said connecting region is higher than the thickness of said welding region, the width of said connecting region is greater than the width of welding region.

As a further improvement of the utility model, the connecting area is 1.5-3mm wider than the welding area.

As a further improvement of the utility model, the thickness of the connecting area is 0.03-0.06mm larger than the thickness of the welding area.

As a further improvement of the present invention, the upper illuminated surface of the connecting area is a reflective layer having an inclined surface and having a toothed undulation.

As a further improvement of the utility model, the included angle between the extending direction of the inclined plane of the reflecting layer and the length direction of the welding strip is 30-60 degrees, preferably 45 degrees.

The welding area is positioned on the main grid electrode of the battery piece, and the width of the welding area is equal to that of the main grid electrode.

The utility model has the advantages that: the utility model discloses increasing the width and the thickness that are located the welding strip of battery piece clearance position under the crooked prerequisite of laminating that does not influence welding strip and battery contact position, the increase current transmission that can be obvious reduces the cluster and hinders, can increase the subassembly electric current through increasing sensitive area and reflectivity simultaneously.

Drawings

FIG. 1 is a schematic structural view of an embodiment of a solder strip of the present invention;

FIG. 2 is a top view of one embodiment of a welded strap connected battery assembly incorporating the present invention;

FIG. 3 is a cross-sectional view of one embodiment of a welded strap connected battery assembly to which the present invention is applied;

wherein: 1-cell, 2-main grid, 3-solder strip, 31-solder area, 32-connection area, 321-reflecting layer.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

The following description is made in detail for the application of the principles of the present invention with reference to the accompanying drawings.

As shown in fig. 1-3 the utility model discloses a solder strip 3 for being the inhomogeneous rectangular of the whole width of "cross" style of calligraphy, solder strip 3 include both ends and be used for welding the bonding region 31 of battery piece 1 and be located the joining region 32 between the clearance of battery piece 1, the length of joining region 32 equal to the middle clearance of battery piece 1. The land 31 is welded to the main grid 2 of the cell 1, and the width of the land 31 is equal to the width of the main grid 2.

The thickness of the connecting area 32 positioned in the middle gap of the battery piece 1 is larger than that of the welding area 31, and the increase of the thickness of the connecting area 32 is beneficial to increasing the cross section of current transmission, reducing the series resistance of the assembly and improving the filling factor, and does not influence the bending performance and the lamination of the welding strip 3 of the welding area 31. The thickness of the increased thickness varies with the thickness of the electrode layer, and in the present invention, the thickness of the connection region 32 is 0.03-0.06mm greater than that of the land 31.

Meanwhile, the width of the connecting area 32 is increased to improve the light receiving area of the solder strip 3, and the width of the connecting area 32 of the solder strip 3 is increased while the adjacent two solder strips 3 arranged in parallel are ensured to be independent from each other and not to be contacted with each other, so that the width of the connecting area 32 of the solder strip 3 is set to be 1.5-3mm wider than that of the welding area 31. In order to increase the light receiving area, the utility model discloses still adopted the roll-compaction technology to make the surface of joining region 32 into the reflector layer 321 that has the dentate undulation of a plurality of inclined planes, and the contained angle between the extending direction of its every inclined plane and the length direction of welding the area 3 is 30 ° -60 °, preferably 45 °. In the implementation process, the surface of the light reflecting layer 321 may be made into a prismatic surface or a corrugated surface. The reflecting surface can reflect incident light for multiple times, and incident light irradiated on the gap of the battery piece 1 is reflected to the battery piece 1, so that the current of the assembly is improved.

Use the utility model discloses a weld battery pack who takes 3 to connect, battery pack's cluster hinders and has reduced 0.02-0.05 omega, and the electric current has improved 0.02-0.04A, and the fill factor has improved 0.2-0.5%, and subassembly power has improved 1-4W.

The basic principles and the main features of the invention and the advantages of the invention have been shown and described above. It will be understood by those skilled in the art that the present invention is not limited to the above embodiments, and that the foregoing embodiments and descriptions are provided only to illustrate the principles of the present invention without departing from the spirit and scope of the present invention. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims

1. The utility model provides a connect battery pack's photovoltaic solder strip which characterized in that: the welding strip (3) is a cross-shaped strip with uneven thickness and width, and comprises a welding area (31) and a connecting area (32), the welding area (31) is positioned at two ends of the welding strip (3) and connected with the battery piece (1), and the connecting area (32) is positioned in the middle gap of the connected battery pieces (1); wherein the thickness of the connecting region (32) is higher than the thickness of the welding region (31), and the width of the connecting region (32) is larger than the width of the welding region (31).

2. The photovoltaic solder ribbon for connecting a battery assembly according to claim 1, wherein: the connecting area (32) is 1.5-3mm wider than the welding area (31).

3. The photovoltaic solder ribbon for connecting a battery assembly according to claim 1, wherein: the thickness of the connecting area (32) is 0.03-0.06mm greater than that of the welding area (31).

4. The photovoltaic solder ribbon for connecting a battery assembly according to claim 1, wherein: the light-receiving surface of the upper layer of the connecting region (32) is a reflective layer (321) with a tooth-shaped undulation and an inclined surface.

5. The photovoltaic solder ribbon for connecting a battery assembly according to claim 4, wherein: the included angle between the extending direction of the inclined surface of the reflecting layer (321) and the length direction of the welding strip (3) is 30-60 degrees.

6. The photovoltaic solder ribbon for connecting a battery assembly according to claim 5, wherein: the included angle between the extending direction of the inclined surface of the reflecting layer (321) and the length direction of the welding strip (3) is 45 degrees.

7. The photovoltaic solder ribbon for connecting a battery assembly according to claim 1, wherein: the welding area (31) is positioned on the main grid electrode (2) of the battery piece (1), and the width of the welding area (31) is equal to that of the main grid electrode (2).