阅读说明：本技术 光伏用三角焊带的制备方法 (Preparation method of triangular solder strip for photovoltaic ) 是由 赵天鹏 王伟亮 陈章洋 杨亚骏 于 2021-08-11 设计创作，主要内容包括：本发明公开了一种光伏用三角焊带的制备方法,包括金属丝塑形和金属丝镀锡；所述金属丝塑形包括：采用一对滚轴对圆形截面金属丝进行压延,将金属丝截面塑型为三角形；所述一对滚轴包括：用作金属丝三角形截面的底面塑型支撑物的第一滚轴,以及用于引导和塑性加工金属丝的第二滚轴；所述第一滚轴和第二滚轴为平行设置的直滚轴；第一滚轴表面平滑；第二滚轴表面开设有环形凹槽,环形凹槽与第二滚轴共轴心,且环形凹槽的横截面为三角形。本发明光伏用三角焊带的制备方法,可提高焊带三角形截面的精度,提升焊带的有效反射区域,进而提高组件的发电量。(The invention discloses a preparation method of a triangular solder strip for photovoltaic, which comprises the steps of metal wire shaping and metal wire tinning; the wire shaping comprises: rolling the metal wire with the circular section by a pair of rolling shafts, and molding the section of the metal wire into a triangle; the pair of rollers includes: a first roller for use as a bottom profiling support for the triangular cross-section of the wire, and a second roller for guiding and plastically working the wire; the first rolling shaft and the second rolling shaft are straight rolling shafts arranged in parallel; the surface of the first roller is smooth; an annular groove is formed in the surface of the second rolling shaft, the annular groove and the second rolling shaft share the axis, and the cross section of the annular groove is triangular. The preparation method of the triangular solder strip for the photovoltaic module can improve the accuracy of the triangular section of the solder strip, improve the effective reflection area of the solder strip and further improve the generated energy of the module.)

1. The preparation method of the triangular solder strip for the photovoltaic comprises the steps of metal wire shaping and metal wire tinning; characterized in that the wire shaping comprises: rolling the metal wire with the circular section by a pair of rolling shafts, and molding the section of the metal wire into a triangle;

the pair of rollers includes: a first roller for use as a bottom profiling support for the triangular cross-section of the wire, and a second roller for guiding and plastically working the wire;

the first rolling shaft and the second rolling shaft are straight rolling shafts arranged in parallel; the surface of the first roller is smooth; an annular groove is formed in the surface of the second rolling shaft, the annular groove and the second rolling shaft share the axis, and the cross section of the annular groove is triangular.

2. The method for manufacturing the triangular solder strip for photovoltaic use according to claim 1, wherein the metal wire shaping comprises the steps of:

1) enabling the first roller and the second roller to be in a non-joint state, placing the metal wire with the circular section between the first roller and the second roller, enabling the metal wire to pass through the annular groove of the second roller, and enabling the metal wire to be stretched straight;

2) attaching the first roller to the second roller, the first roller applying a force to the wire towards the second roller; and driving the first roller and/or the second roller to rotate to drive the metal wire to feed, and rolling the metal wire when the metal wire passes through the first roller and the second roller.

3. The method of manufacturing a v-belt for photovoltaic applications as defined in claim 2, wherein the metal wire is wound up after passing through the first and second rollers.

4. The method according to claim 1, wherein the first roller is disposed above the second roller.

5. The method for manufacturing a v-fillet for photovoltaic use according to claim 1, wherein the first roller is supported by a movable bearing; the second roller is supported by a fixed bearing.

6. The method for manufacturing the fillet solder for photovoltaic use of claim 5, wherein the position of the movable bearing is locked after the first roller and the second roller are attached.

7. The method for preparing the fillet for photovoltaic use according to claim 1, wherein the first roller and/or the second roller are/is driven to rotate by a motor.

8. The method for preparing the triangular solder strip for photovoltaic use according to claim 1, wherein the metal wire is tinned first and then the metal wire is shaped.

9. The method for preparing the triangular solder strip for photovoltaic use according to claim 8, wherein the step of tinning the metal wire comprises the following steps: the metal wire with the circular section is subjected to acid cleaning and soldering flux cleaning, an oxide layer on the surface of the metal wire is removed, the metal wire passes through soldering tin in a molten state, and the metal wire with the soldering tin is wound.

10. The method for manufacturing a v-solder ribbon for photovoltaic use according to claim 9, wherein an outer diameter of the circular-section wire is not less than 0.05 mm; the soldering tin is made of normal-temperature tin-lead alloy or low-temperature tin-bismuth alloy.

Technical Field

The invention relates to the field of photovoltaics, in particular to a preparation method of a triangular solder strip for photovoltaics.

Background

In the current assembly manufacturing link in the photovoltaic field, the mainstream technical scheme is to use a tinned metal wire (hereinafter referred to as a solder strip) to connect in series silver paste main grids printed on the positive electrode and the negative electrode of a battery in a welding mode, so that all batteries in one assembly form a stable series-parallel electrical performance structure in the assembly according to design. In the process, the solder strip inevitably covers a part of the light receiving area of the battery piece, the position of the solder strip and the shielded area of the solder strip are different according to the battery pattern design and the assembly process design, and as a result, a part of the photoproduction current of the battery is lost due to the shielding of the solder strip.

Through reducing the area that shelters from of solder strip and main bars, promoting modes such as utilization ratio of battery light receiving area light, can effectual promotion subassembly photoproduction current numerical value to improve the actual generated energy of subassembly. In these technologies, the practical technology application trend is to use thinner solder strips and special structures, such as solder strips with triangular cross sections (hereinafter referred to as triangular solder strips), so that the light of the shielded part is reflected back to the light receiving area of the battery, and the like.

However, there is a contradiction that the thinner the wire diameter of the solder ribbon, the more difficult it is to actually fabricate the light reflecting structure. Taking a fillet weld as an example: a general triangular welding strip is used for shaping the cross section of a round copper wire through a triangular perforated wire drawing die and carrying out annealing and tinning. The wire diameter (the width of the bottom edge of the triangular section of the welding strip) of the triangular welding strip processed by the method is generally more than 0.3mm, and the triangular section processed by the method is not a perfect triangle, and each angle of the triangle is arc-shaped, so that the area of the welding strip which should play a role of reflection originally is caused, and light cannot be effectively returned to a battery in an area. Under better machining precision, the machining width of the triangular arc is still larger than 0.03mm, namely, the triangular arc is converted to a triangular welding strip with the line diameter of 0.3mm, and approximately 20% of the shielding area of the welding strip cannot effectively play a reflection role. With the wire diameter required by the solder strip becoming thinner and thinner, and the arc processing width of 0.03 being unable to be reduced, the proportion of the effective reflection area of the solder strip prepared by the processing method is lower than 80%, and the thinner solder strip, the less the effective reflection area.

In addition, because the preparation process of current solder strip is tin plating again after moulding, along with the line footpath of welding the area is more and more thin, the thickness of tin coating also can rise in the proportion of accounting for of cross-section, and among the tin plating process, liquid level tension can make the surface of wire more mellow and more by liquid metallic tin parcel, and this can further reduce the effective reflection area who welds the area.

In addition, in the process of processing thinner welding strips, the mechanical property of the metal wire is gradually reduced, the tensile capacity and the breaking elongation of the metal wire are synchronously reduced, and the conditions such as wire breakage and the like are easier to occur in the processing mode of using a wire drawing die.

Disclosure of Invention

The invention aims to provide a preparation method of a triangular solder strip for photovoltaic, which comprises metal wire shaping and metal wire tinning; the wire shaping comprises: rolling the metal wire with the circular section by a pair of rolling shafts, and molding the section of the metal wire into a triangle;

the pair of rollers includes: a first roller for use as a bottom profiling support for the triangular cross-section of the wire, and a second roller for guiding and plastically working the wire;

the first rolling shaft and the second rolling shaft are straight rolling shafts arranged in parallel; the first roller surface (side circumferential surface) is smooth; an annular groove is formed in the surface (side circumferential surface) of the second rolling shaft, the annular groove and the second rolling shaft share the axis, and the cross section of the annular groove is triangular.

Preferably, the wire shaping comprises the steps of:

1) enabling the first roller and the second roller to be in a non-joint state, placing the metal wire with the circular section between the first roller and the second roller, enabling the metal wire to pass through the annular groove of the second roller, and enabling the metal wire to be stretched straight;

2) attaching the first roller to the second roller, the first roller applying a force to the wire towards the second roller; and driving the first roller and/or the second roller to rotate to drive the metal wire to feed, and rolling the metal wire when the metal wire passes through the first roller and the second roller.

Preferably, the metal wire passes through the first roller and the second roller, and then the metal wire after being rolled is rolled up.

Preferably, the first roller is arranged above the second roller.

Preferably, said first roller is supported by a movable bearing; the second roller is supported by a fixed bearing.

Preferably, after the first roller and the second roller are attached, the position of the movable bearing is locked.

Preferably, the first roller and/or the second roller are/is driven to rotate by a motor.

Preferably, the metal wire is tinned first and then the metal wire is shaped.

Preferably, the wire tinning comprises the following steps: the metal wire with the circular section is subjected to acid cleaning and soldering flux cleaning, an oxide layer on the surface of the metal wire is removed, the metal wire passes through soldering tin in a molten state, and the metal wire with the soldering tin is wound.

Preferably, the outer diameter of the round section metal wire is not less than 0.05 mm; the soldering tin is made of normal-temperature tin-lead alloy or low-temperature tin-bismuth alloy.

The invention has the advantages and beneficial effects that: the preparation method of the triangular solder strip for the photovoltaic module is provided, the accuracy of the triangular section of the solder strip can be improved, the effective reflection area of the solder strip is improved, and the generating capacity of the module is further improved.

The invention has the following characteristics:

1) the triangular welding strip processed by the method has higher triangular section precision, the arc width of the vertex angle of the triangle is obviously reduced compared with the scheme of a wire drawing die, the effective reflection area of the welding strip is greatly increased, and the power generation performance of the assembly can be improved.

2) The preparation method is also suitable for manufacturing the welding strip with a thinner wire diameter, can improve the forming degree of the ultra-thin metal wire when the triangular cross section is processed, is beneficial to increasing the light utilization rate by utilizing reflected light, can promote the width reduction of the welding strip so as to reduce the light shielding of the front side of the assembly, and further improves the power generation performance of the assembly.

3) The preparation method is suitable for the scheme of tin plating before machining, the tin plating scheme can ensure the flatness of the surface of the welding strip after the non-welding surface is machined, the reflectivity of the whole welding strip to light rays can be improved, and the power generation performance of the assembly can be improved.

Drawings

FIG. 1 is a schematic view of a first roller and a second roller in an unapplied state;

fig. 2 is a schematic view of the first roller and the second roller being attached to each other.

Detailed Description

The following description of the embodiments of the present invention will be made with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.

The invention provides a preparation method of a triangular solder strip for photovoltaic, which comprises the steps of metal wire shaping and metal wire tinning; the metal wire can be a copper wire; the metal wire shaping can be carried out firstly, and then the metal wire tinning is carried out; tin plating can also be carried out on the metal wire firstly, and then the metal wire shaping is carried out;

as shown in fig. 1 and 2, the wire shaping comprises: rolling a metal wire 5 with a circular section by adopting a pair of rolling shafts 1 and 2, and molding the section of the metal wire 5 into a triangle;

the pair of rollers includes: a first roller 1 for the bottom-shaping support of the triangular section of the wire 5, and a second roller 2 for guiding and plastic working the wire 5;

the first roller 1 and the second roller 2 are straight rollers arranged in parallel; the first roller 1 is arranged above the second roller 2, the first roller 1 is supported by a movable bearing 3, and the second roller 2 is supported by a fixed bearing 4; the surface (side circumferential surface) of the first roller 1 is smooth; an annular groove 21 is formed in the surface (side circumferential surface) of the second roller 2, the annular groove 21 and the second roller 2 share the same axis, and the cross section of the annular groove 21 is triangular;

specifically, the metal wire shaping comprises the following steps:

1) as shown in fig. 1, the first roller 1 and the second roller 2 are in a non-bonding state, the metal wire 5 with a circular section is placed between the first roller 1 and the second roller 2, the metal wire 5 passes through the annular groove 21 of the second roller 2, and the metal wire 5 is straightened;

2) as shown in fig. 2, the first roller 1 is attached to the second roller 2, and the first roller 1 applies a force to the wire 5 toward the second roller 2 to lock the position of the movable bearing 3; a motor is adopted to drive the first roller 1 and/or the second roller 2 to rotate, so as to drive the metal wire 5 to feed, and the metal wire 5 is rolled when passing through the first roller 1 and the second roller 2;

3) and after the metal wire 5 passes through the first roller 1 and the second roller 2, the metal wire 5 which is rolled is wound by warps.

The first roller 1 and the second roller 2 are matched for use, and one of the rollers is rotated by a motor to drive the first roller 1 and the second roller 2 to process, mold and feed the metal wire 5; the first roller 1 and the second roller 2 are respectively connected with a bearing, wherein the bearing of the first roller 1 is a movable bearing 3, the movable bearing 3 applies downward force to the first roller 1, the strength is determined according to the mechanical property of the processed metal wire 5, and the materials of the first roller 1 and the second roller 2 also ensure that the hardness and the yield strength are far greater than those of the processed metal wire 5.

If the metal wire is tinned firstly and then the metal wire is shaped, the tinning of the metal wire comprises the following steps: carrying out acid washing and scaling powder cleaning on the metal wire with the circular section, removing an oxide layer on the surface of the metal wire, enabling the metal wire to pass through soldering tin in a molten state, and then winding the metal wire stained with the soldering tin; the outer diameter of the round section metal wire is determined according to the design requirement, and the minimum outer diameter can be 0.05 mm; the soldering tin component needs to use soldering tin corresponding to the battery technology, and the soldering tin can adopt normal-temperature tin-lead alloy or low-temperature tin-bismuth alloy and the like.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the technical principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.