CN110783422A - High-efficient photovoltaic solder strip - Google Patents

Abstract

The invention relates to a high-efficiency photovoltaic welding tape. The conductive base tape has two sides, the upper ends of the two sides are close to each other to form a narrow part, and the lower ends are far away from each other to form a wide part. The outer surface of the solder covered on the side of the conductive base tape is close to an inclined plane. The inclined plane is a preset effective reflection multiplexing surface. Through the setting of the agglomeration structure, the solder layers on the two sides of the conductive base tape are melted and agglomerated. , and after the welding is completed, the outer surfaces on both sides of the welding strip can present a shape similar to an inclined plane, so as to ensure that the outer surfaces on both sides of the welding strip can approach the preset effective reflective multiplexing surface. On the one hand, the effective reflection multiplexing area is increased, and at the same time, most or all of the reflections on the outer surfaces of the ribbons can be totally reflected at the glass-air interface layer of the photovoltaic cell module, or directly reflected on the surface of the cell, so as to realize the Optimization of ribbon reflective multiplexing ratio.

Description

High Efficiency Photovoltaic Ribbon

technical field

The invention relates to the technical field of photovoltaic welding strips, in particular to a high-efficiency photovoltaic welding strip.

Background technique

Welding ribbon, also known as interconnecting ribbon or busbar, is an important raw material in the welding process of photovoltaic modules. Welding ribbon is usually used to connect the cells to each other and collect current by welding or conductive adhesive bonding. The quality of the welding ribbon will be determined. It directly affects the current collection efficiency of photovoltaic modules and has a considerable impact on the power of photovoltaic modules. How to increase the shading multiplexing rate of the component surface and reduce the fragmentation rate through the isomerization of the welding ribbon has always been one of the research topics of the welding ribbon industry.

Since the critical angle of total reflection of sunlight at the glass-air interface layer of the photovoltaic cell module is about 42°, the incident angle of the reflected light on the welding tape to the glass-air interface layer of the photovoltaic module is greater than or equal to the critical angle. , the sunlight will be totally reflected at the interface layer between the glass and the air of the photovoltaic module, so that the totally reflected sunlight will participate in the photoelectric conversion again. The reflection on this part of the welding tape is called effective reflection; The requirement of total reflection will pass through the glass of the photovoltaic cell module, so it cannot be used;

At present, there are three main types of heterogeneous welding strips on the market according to their cross-sectional profiles, namely rectangular welding strips with a rectangular cross-sectional profile, circular welding strips with a circular cross-sectional profile, and triangular cross-sectional profiles. Triangular welding strip; among them, the usage rate of rectangular welding strip is the highest;

The specific analysis of the respective reflective multiplexing capabilities of the above three types of ribbons is as follows:

Regarding the rectangular welding tape, such as the preparation method and production line of a heterogeneous high-efficiency photovoltaic welding tape and a conductive base tape given by the Chinese patent CN104157712B under the applicant's name, and a photovoltaic welding tape given by the Chinese patent CN104157712B, its The disclosed welding strips are provided with a specially designed V-shaped groove on the upper surface of the rectangular welding strip, so that most or all of the reflection of the V-shaped groove can be totally reflected at the glass-air interface layer of the photovoltaic cell module, and the total reflection occurs. The reflected sunlight will return to the surface of the battery to participate in photoelectric conversion, so as to solve the multiplexing problem of the shading of the ribbon and increase the power of the (photovoltaic) module. The advantage of this design is that it can be plug-and-play on the traditional battery string welding machine, and there is no special modification requirement for the string welding equipment. As a result, there is still room for improvement in the reflective multiplexing capability.

Regarding the circular welding strip with a circular cross section, such as the conductive welding wire for solar cells and its preparation method given in Chinese patent CN106825981B, the conductive welding wire with a circular cross section is mainly used to reduce the shading area, thereby increasing the The photoelectric conversion efficiency of the solar panel; but this type of ribbon with a circular cross section: 1) When the surface reflection reaches the glass-air interface layer of the photovoltaic cell module, a considerable part (23.6%) of the reflection does not constitute total reflection, and also That is, it will pass through the glass of the photovoltaic cell module, so it cannot be used; 2) Under the same conductive cross-sectional area, a larger welding wire height is required, which brings the following problems: a) A thicker EVA/POE is required to encapsulate the photovoltaic module , the manufacturing cost will increase; b) When the outdoor sunlight is oblique, there will be a longer shadow of the welding wire to block the battery, resulting in an increase in the effective and practical power generation that is much lower than the increase in power generation that should be brought about by the nominal reflective multiplexing gain of the welding wire.

Regarding the triangular welding strip with a triangular cross-section, such as the photovoltaic welding strip given in Chinese patent CN106784102A, it mainly uses a triangular inclined plane for reflective multiplexing; as shown in Figure 1 . Although the design concept of the triangular solder ribbon intends to provide two beveled sides as effective sides, which is intended to increase the effective reflective multiplexing area, it does not take into account that the solder layer on the triangular solder ribbon will produce a destroy. The inventors found that when the triangular solder ribbon is actually soldered, the solder layer on the hypotenuse will agglomerate in the middle of the hypotenuse after melting, (the liquid solder on the hypotenuse flows down after melting and is in the middle of the hypotenuse). Gradually accumulate, and then pull the liquid solder at the upper and lower ends of the hypotenuse to gather in the middle), so that after welding, the two hypotenuses of the welding strip change from a bevel to a large protruding arc-like surface in the middle, referred to as an arc surface. , and the arc surface is a gradually inclined structure, which will be similar to the surface of the round welding wire, resulting in the loss of reflective multiplexing ability.

SUMMARY OF THE INVENTION

The technical problem to be solved by the present invention is: in order to solve the problem that when the triangular welding strip is welded in the prior art, the solder will agglomerate in the middle part of the hypotenuse, so that the two hypotenuses of the triangular welding strip become large protruding in the middle. The curved surface of the invention leads to the problem of reducing its reflective multiplexing ability. Now a high-efficiency photovoltaic welding tape is provided.

The technical solution adopted by the present invention to solve the technical problem is: a high-efficiency photovoltaic soldering tape: comprising a conductive base tape, the conductive base tape is covered with a solder layer, the conductive base tape has two sides, and the upper ends of the two sides are mutually Close to form the narrow part, the lower ends are far away from each other to form the wide part, at least one agglomeration structure is provided on both sides of the conductive base tape, so that the outer surface covering the side of the conductive base tape tends to an inclined plane, and the inclined plane is preset Effective reflective multiplexing surface.

In the above scheme, through the setting of the agglomeration structure, the solder layers on the two sides of the conductive base tape are melted and then agglomerated, and after the welding is completed, the outer surfaces of the two sides of the welding tape can be approximately inclined planes. The outer surfaces on both sides of the belt can approach the preset effective reflective multiplexing surface. On the one hand, the effective reflection multiplexing area is increased, and at the same time, most or all of the reflections on the outer surfaces of the ribbons can be totally reflected at the glass-air interface layer of the photovoltaic cell module, or directly reflected on the surface of the cell, so as to realize the Optimization of ribbon reflex multiplexing ratio.

Further, the agglomeration structure is an agglomeration groove located on the side surface which is recessed inward.

Further, there is one agglomeration groove on each side, which connects the narrow part and the wide part. The deepest part of the agglomeration groove is located in the middle part of the side where it is located, and this is the center of the agglomeration, and the two sides of the agglomeration groove are placed up and down. The solder at the end draws and converges toward the agglomeration center, so that the outer surfaces on both sides of the solder ribbon can present a shape similar to an inclined plane.

Further, there are at least two agglomeration grooves on each side, and the deepest part of each agglomeration groove is the agglomeration center, and the solder at the upper and lower ends of the At least two agglomeration points of the outer surface can connect planes that exhibit an approximate slope.

Further, the cross-sectional shape of the agglomeration tank is arc, V or trapezoid.

Further, the agglomeration structure includes a fin portion arranged at the bottom of the side surface, the upper surface of the fin portion is butted with the side surface of the side where it is located, and the solder at the butt joint is easy to clump together after being melted, forming a larger agglomeration point, and The solder on the side and the end of the fin is pulled to approach and converge, so that the outer surfaces on both sides of the ribbon can be approximately inclined plane.

Further, the side surfaces are inclined surfaces, inwardly concave arc surfaces, and outwardly convex arc surfaces.

Further, the upper surface of the fin portion is an inclined surface, a downwardly concave curved surface, an upwardly convex curved surface or a plane parallel to the wide portion.

Further, the height h of the fins is 0.01mm≤h≤0.3mm.

Further, the width L of the fins is 0.01mm≤L≤0.3mm.

Further, the length a of the side surface is 0.01mm≤a≤0.5mm.

Further, the ratio between the width La of the narrow portion and the width Lb of the wide portion is in the range of 0.01-0.5.

Further, the included angle θ between the preset effective reflective surfaces on both sides of the welding strip is 72°≤θ≤101.5°.

Further, the included angle θ between the preset effective reflective surfaces on both sides of the welding strip is 83.6°≤θ≤95.7°.

Further, the two side surfaces of the conductive base tape are arranged symmetrically with each other.

Further, the narrow part and the wide part are both approximate planes, wherein, the narrow part and the wide part respectively have their corresponding virtual planes, and the vertical distance from any point on the surface of the narrow part or the wide part to its corresponding virtual plane is less than 0.03mm, the angle between the above two virtual planes is not more than 15°.

Further, the above two virtual planes are parallel to each other.

Further, the solder layer is uniformly coated on the conductive base tape, and the difference between the maximum value and the minimum value of the thickness of the solder layer does not exceed 0.015mm.

Further, the thickness b of the solder layer is 0.007mm≤b≤0.025mm.

The beneficial effects of the present invention are: the high-efficiency photovoltaic welding tape of the present invention, through the setting of the agglomeration structure, makes the solder layers on the two sides of the conductive base tape melt and agglomerate, and after the welding is completed, the outer surfaces on both sides of the welding tape are It can present a shape similar to an inclined plane, so as to ensure that the outer surfaces on both sides of the ribbon can approach the preset effective reflection multiplexing surface. On the one hand, the effective reflection multiplexing area is increased, and at the same time, most or all of the reflections on the outer surfaces of the ribbons can be totally reflected at the glass-air interface layer of the photovoltaic cell module, or directly reflected on the surface of the cell, so as to realize the Optimization of ribbon reflex multiplexing ratio.

Description of drawings

The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

Figure 1 is the reflection diagram of the triangular welding strip after welding;

2 is a schematic cross-sectional view of Embodiment 1 of the present invention;

Fig. 3 is the solder distribution schematic diagram after welding is completed in Example 1 of the present invention;

4 is a metallographic structure diagram of the welding ribbon of Example 1 of the present invention after melting;

Fig. 5 is the reflective diagram of embodiment 1 of the present invention after welding is completed;

Fig. 6 is the reflective diagram of embodiment 1 of the present invention after welding is completed;

7 is a schematic cross-sectional view of Embodiment 2 of the present invention;

FIG. 8 is a schematic diagram of the solder distribution of Embodiment 2 of the present invention after welding is completed;

9 is a schematic cross-sectional view of Embodiment 3 of the present invention;

FIG. 10 is a schematic diagram of the solder distribution of Embodiment 3 of the present invention after the welding is completed;

11 is a schematic cross-sectional view of Embodiment 4 of the present invention;

12 is a solder distribution diagram of Example 4 of the present invention after welding is completed;

13 is a schematic cross-sectional view of Embodiment 5 of the present invention;

14 is a solder distribution diagram of Example 5 of the present invention after welding is completed;

15 is a schematic cross-sectional view of Embodiment 6 of the present invention;

16 is a solder distribution diagram of Example 6 of the present invention after welding is completed;

In the figure: 1. Conductive base tape, 2. Solder layer, 3. Side surface, 4. Narrow part, 5. Wide part, 6. Effective reflective surface, 7. Agglomeration groove, 8. Fin part, h. Height of fin , L. The width of the fin, a. The length of the side, La. The width of the narrow part, Lb. The width of the wide part, θ. The angle between the effective reflective surfaces on both sides of the ribbon, b. The thickness of the solder layer .

Detailed ways

The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are all simplified schematic diagrams, and only illustrate the basic structure of the present invention in a schematic manner, so they only show the structures related to the present invention.

The angle between the incident light and the normal of the glass surface of the photovoltaic module is defined as the incident angle. For fixed installed PV modules, record the incident angle as -90° at sunrise, 0° at noon, and +90° at sunset.

In the present invention, when the included angle θ between the preset effective reflective surfaces 6 on both sides of the welding strip is between 72° and 101.5°, the double hypotenuse can be guaranteed when the incident angle is between -60° and +60°. The reflected light can be returned to the battery surface for reuse. When the included angle θ is selected between 83.6 and 95.7, the reflection of the double hypotenuse can be guaranteed when the incident angle is between -90° and +90° (that is, the whole day). Light can be returned to the cell surface to be reused.

The conductive base tape 1 can be made of copper or copper alloy, and is automatically welded by a universal round wire string welding machine. Because the contact width between the narrow part 4 and the wide part 5 of the welding tape and the battery electrode of the present invention is larger than the contact width between the ordinary round welding wire and the battery electrode, it can be plug and play on the general round welding wire stringer, and the welding tension is greater than or equal to round welding wire.

Example 1:

As shown in FIG. 2, FIG. 3 and FIG. 4, a high-efficiency photovoltaic welding tape includes a conductive base tape 1, the conductive base tape 1 is covered with a solder layer 2, and the conductive base tape 1 has two side surfaces 3, two The upper ends of the side surfaces 3 are close to each other to form a narrow portion 4, and the lower ends are far away from each other to form a wide portion 5. Both sides of the conductive base tape 1 are provided with at least one agglomeration structure, so that the outer surface covering the side surface 3 of the conductive base tape 1 tends to be inclined. , the inclined plane is the preset effective reflective surface 6;

The agglomeration structure includes a fin portion 8 arranged at the bottom of the side surface 3, the upper surface of the fin portion 8 is butted with the side surface 3 on the side where it is located, the side surface 3 is an inclined surface inclined outward from top to bottom, and the upper surface of the fin portion 8 is A plane parallel to the wide portion 5 .

The height h of the fin is 0.01mm≤h≤0.3mm, the width L of the fin is 0.025mm; the length a of the side 3 is 0.30mm; the left and right outer surfaces of the welding strip tend to be inclined. bevel. After welding, the outer contour of the cross section of the left and right outer surfaces of the welding strip is close to a straight line, and the maximum depth is: 0.007mm, that is, the left outer surface and the right outer surface of the welding strip are close to inclined slopes.

The narrow part 4 has a width La of 0.06mm;

The tin-lead solder is uniformly prepared on the above-mentioned conductive base tape 1 by electroplating, and the thickness b of the solder layer 2 is 0.015mm;

It adopts 9 busbar 22.0% single crystal Perc cells, half-cell structure, 72-piece module plate type, and adopts universal round wire string welding machine for automatic welding. Because the width of the wide part and the narrow part in contact with the battery is larger than that of the round wire, the welding quality of the present invention is better than that of the round wire. Compared with the round welding wire with the same cross-sectional area, the present invention improves the power of the assembly by about 2.7 watts.

As shown in Figure 5 and Figure 6, the reflection diagram of the welding tape in this embodiment after welding is completed

Example 2:

As shown in FIG. 7 and FIG. 8, a high-efficiency photovoltaic soldering tape includes a conductive base tape 1, the conductive base tape 1 is covered with a solder layer 2, and the conductive base tape 1 has two side surfaces 3, and the two side surfaces 3 are The upper ends are close to each other to form a narrow portion 4, and the lower ends are far away from each other to form a wide portion 5. Both sides of the conductive base tape 1 are provided with at least one agglomeration structure, so that the outer surface covering the side surface 3 of the conductive base tape 1 tends to be inclined. Plane, The inclined plane is the preset effective reflective surface 6;

The agglomeration structure is an inwardly concave agglomeration groove 7 on the side surface 3 .

There are at least two agglomeration grooves 7 on each side surface 3, and the cross-sectional shape of the agglomeration grooves 7 is arc, V-shaped or trapezoidal, wherein, the maximum depth of the agglomeration groove 7 is located in the middle part of the side surface 3, And the maximum depth depth of the agglomeration groove 7 is: 0.02mm; the length a of the side surface 3 is 0.27mm; the left outer surface and the right outer surface of the welding strip are both inclined to inclined planes. After welding, the outer contour of the cross section of the left and right outer surfaces of the welding strip is close to a straight line, and the maximum depth is: 0.01mm, that is, the left outer surface and the right outer surface of the welding strip are close to inclined slopes.

The narrow part 4 has a width La of 0.05mm;

The tin-lead solder is approximately uniformly prepared on the above-mentioned conductive base tape 1 by electroplating, and the thickness b of the solder layer 2 is 0.014mm;

It adopts 9 busbar 22.0% single crystal Perc cells, half-cell structure, 72-piece module plate type, and adopts universal round wire string welding machine for automatic welding. Because the width of the wide part and the narrow part in contact with the battery is larger than that of the round wire, the welding quality of the present invention is better than that of the round wire. Compared with the round welding wire with the same cross-sectional area, the present invention increases the power of the assembly by about 2.4 watts.

Example 3

As shown in FIG. 9 and FIG. 10 , a high-efficiency photovoltaic welding tape includes a conductive base tape 1, the conductive base tape 1 is covered with a solder layer 2, and the conductive base tape 1 has two side surfaces 3, and the two side surfaces 3 have two sides. The upper ends are close to each other to form a narrow portion 4, and the lower ends are far away from each other to form a wide portion 5. Both sides of the conductive base tape 1 are provided with at least one agglomeration structure, so that after the automatic stringing is completed, the outer surface covered on the side 3 of the conductive base tape 1 is approached. For the inclined plane, the inclined plane is the preset effective reflective surface 6;

The agglomeration structure is an inwardly concave agglomeration groove 7 on the side surface 3 .

There is one agglomeration groove 7 on each side 3, and the cross-sectional shape of the agglomeration groove 7 is arc, V-shaped or trapezoidal, and connects the narrow part 4 and the wide part 5, wherein the maximum depth of the agglomeration groove 7 is located at The middle part of the side 3, and the maximum depth of the agglomeration groove 7 is: 0.03mm; the length a of the side 3 is 0.21mm; the left outer surface and the right outer surface of the welding strip tend to be inclined slopes. After welding, the outer contour of the cross section of the left and right outer surfaces of the welding strip is close to a straight line, and the maximum depth is: 0.008mm, that is, the left outer surface and the right outer surface of the welding strip are close to inclined slopes.

The width La of the narrow portion 4 is 0.03mm;

The tin-lead solder is approximately uniformly prepared on the above-mentioned conductive base tape 1 by electroplating, and the thickness b of the solder layer 2 is 0.015mm;

It adopts 9 busbar 22.0% single crystal Perc cells, half-cell structure, 60-piece module plate type, and adopts universal round wire string welding machine for automatic welding. Because the width of the wide part and the narrow part in contact with the battery is larger than that of the round wire, the welding quality of the present invention is better than that of the round wire. Compared with the round welding wire with the same cross-sectional area, the present invention increases the power of the assembly by about 2.1 watts.

Example 4

As shown in FIG. 11 and FIG. 12, a high-efficiency photovoltaic soldering tape includes a conductive base tape 1, the conductive base tape 1 is covered with a solder layer 2, and the conductive base tape 1 has two side surfaces 3, and the two side surfaces 3 have two sides. The upper ends are close to each other to form a narrow portion 4, and the lower ends are far away from each other to form a wide portion 5. Both sides of the conductive base tape 1 are provided with at least one agglomeration structure, so that the outer surface covering the side surface 3 of the conductive base tape 1 tends to be inclined. Plane, The inclined plane is the preset effective reflective surface 6;

The agglomeration structure includes a fin portion 8 arranged at the bottom of the side surface 3, the upper surface of the fin portion 8 is butted with the side surface 3 on the side where it is located, the side surface 3 is an inclined surface inclined outward from top to bottom, and the upper surface of the fin portion 8 is It is an inclined surface inclined outward from top to bottom, the angle between the side 3 and the lower surface of the wide part 5 and the angle between the upper surface of the fin part 8 and the lower surface of the wide part 5 are acute angles, and the side 3 The included angle with the lower surface of the wide portion 5 >the included angle between the upper surface of the fin portion 8 and the lower surface of the wide portion 5 .

The height h of the fin is 0.01mm≤h≤0.3mm, the width L of the fin is 0.025mm; the length a of the side 3 is 0.20mm; the outer contour of the outer surface of the left and right sides of the welding strip is close to a straight line. After welding, the outer contour of the cross section of the left and right outer surfaces of the welding strip is close to a straight line, and the maximum depth is: 0.01mm, that is, the left outer surface and the right outer surface of the welding strip are close to inclined slopes.

The narrow part 4 has a width La of 0.05mm;

The tin-lead solder is uniformly prepared on the above-mentioned conductive base tape 1 by electroplating, and the thickness b of the solder layer 2 is 0.014mm;

It adopts 9 busbar 22.0% single crystal Perc cells, half-cell structure, 60-piece module plate type, and adopts universal round wire string welding machine for automatic welding. Because the width of the wide part and the narrow part in contact with the battery is larger than that of the round wire, the welding quality of the present invention is better than that of the round wire. Compared with the round welding wire with the same cross-sectional area, the present invention increases the power of the assembly by about 2.1 watts.

Example 5

As shown in FIG. 13 and FIG. 14 , a high-efficiency photovoltaic soldering tape includes a conductive base tape 1 , the conductive base tape 1 is covered with a solder layer 2 , and the conductive base tape 1 has two side surfaces 3 . The upper ends are close to each other to form a narrow portion 4, and the lower ends are far away from each other to form a wide portion 5. Both sides of the conductive base tape 1 are provided with at least one agglomeration structure, so that the outer surface covering the side surface 3 of the conductive base tape 1 tends to be inclined. Plane, The inclined plane is the preset effective reflective surface 6;

The agglomeration structure includes a fin portion 8 arranged at the bottom of the side surface 3, the upper surface of the fin portion 8 is butted with the side surface 3 on the side where it is located, the side surface 3 is an inwardly concave arc surface, and the upper surface of the fin portion 8 is the same as the width. Section 5 is parallel to the plane.

The height h of the fin is 0.01mm≤h≤0.3mm, the width L of the fin is 0.015mm; the length a of the side 3 is 0.17mm; the outer contour of the outer surface of the left and right sides of the welding strip is close to a straight line. After welding, the outer contour of the cross-section of the left and right outer surfaces of the welding strip is close to a straight line, and the maximum depth is: 0.009mm, that is, the left outer surface and the right outer surface of the welding strip are close to inclined slopes.

The narrow part 4 has a width La of 0.05mm;

The tin-lead solder is uniformly prepared on the above-mentioned conductive base tape 1 by electroplating, and the thickness b of the solder layer 2 is 0.015mm;

It adopts 9 busbar 22.0% single crystal Perc cells, half-cell structure, 60-piece module plate type, and adopts universal round wire string welding machine for automatic welding. Because the width of the wide part and the narrow part in contact with the battery is larger than that of the round wire, the welding quality of the present invention is better than that of the round wire. Compared with the round welding wire of the same cross-sectional area, the present invention increases the power of the assembly by about 2.0 watts.

Example 6

As shown in FIG. 15 and FIG. 16, a high-efficiency photovoltaic soldering tape includes a conductive base tape 1, the conductive base tape 1 is covered with a solder layer 2, and the conductive base tape 1 has two side surfaces 3, and the two side surfaces 3 are The upper ends are close to each other to form a narrow portion 4, and the lower ends are far away from each other to form a wide portion 5. Both sides of the conductive base tape 1 are provided with at least one agglomeration structure, so that the outer surface covering the side surface 3 of the conductive base tape 1 tends to be inclined. Plane, The inclined plane is the preset effective reflective surface 6;

The agglomeration structure includes a fin portion 8 arranged at the bottom of the side surface 3, the upper surface of the fin portion 8 is butted with the side surface 3 on the side where it is located, the side surface 3 is an arc surface that protrudes outward, and the upper surface of the fin portion 8 is connected to the side surface 3. The wide part 5 is parallel to the plane.

The height h of the fin is 0.01mm≤h≤0.3mm, and the width L of the fin is 0.03mm; the length a of the side 3 is 0.30mm; After welding, the outer contour of the cross section of the left and right outer surfaces of the welding strip is close to a straight line, and the maximum depth is: 0.012mm, that is, the left outer surface and the right outer surface of the welding strip are both close to inclined slopes.

The narrow part 4 has a width La of 0.07mm;

The tin-lead solder is uniformly prepared on the above-mentioned conductive base tape 1 by electroplating, and the thickness b of the solder layer 2 is 0.014mm;

It adopts 9 busbar 22.0% single crystal Perc cells, half-cell structure, 72-piece module plate type, and adopts universal round wire string welding machine for automatic welding. Because the width of the wide part and the narrow part in contact with the battery is larger than that of the round wire, the welding quality of the present invention is better than that of the round wire. Compared with the round welding wire with the same cross-sectional area, the present invention improves the power of the assembly by about 2.1 watts.

Taking the above ideal embodiments according to the present invention as inspiration, and through the above description, relevant personnel can make various changes and modifications without departing from the technical idea of the present invention. The technical scope of the present invention is not limited to the contents in the specification, and the technical scope must be determined according to the scope of the claims.

Claims (19)

1. A high-efficiency photovoltaic welding tape: comprising a conductive base tape (1), and the conductive base tape (1) is covered with a solder layer (2), characterized in that: the conductive base tape (1) has two sides (3). ), the upper ends of the two sides (3) are close to each other to form a narrow portion (4), and the lower ends are far away from each other to form a wide portion (5), and both sides of the conductive base tape (1) are provided with at least one agglomeration structure, and the agglomeration The structure is arranged such that the solder layer (2) is agglomerated in various agglomerated structures when melted, so that the outer surface of the solder covering the side (3) of the conductive base tape (1) approaches an inclined plane, and the inclined plane is a preset effective Reflective surface (6). 2 . The high-efficiency photovoltaic welding ribbon according to claim 1 , wherein the agglomeration structure is an agglomeration groove ( 7 ) located on the side surface ( 3 ) which is recessed inward. 3 . 3. The high-efficiency photovoltaic soldering tape according to claim 2, characterized in that: each side surface (3) has one agglomeration groove (7), which connects the narrow part (4) and the wide part (5). 4 . The high-efficiency photovoltaic welding ribbon according to claim 2 , characterized in that: at least two agglomeration grooves ( 7 ) on each side surface ( 3 ) are distributed at intervals. 5 . 5. The high-efficiency photovoltaic welding ribbon according to claim 3 or 4, wherein the cross-sectional shape of the agglomeration groove (7) is arc, V or trapezoid. 6 . The high-efficiency photovoltaic welding ribbon according to claim 1 , wherein the agglomeration structure comprises a fin portion ( 8 ) arranged at the bottom of the side surface ( 3 ), and the upper surface of the fin portion ( 8 ) is connected to the upper surface of the fin portion ( 8 ). The side (3) of the side where it is located is butted. 7 . The high-efficiency photovoltaic welding strip according to claim 6 , wherein the side surface ( 3 ) is an inclined surface, an inwardly concave arc surface, and an outwardly convex arc surface. 8 . 8 . The high-efficiency photovoltaic welding ribbon according to claim 7 , wherein the upper surface of the fin portion ( 8 ) is an inclined plane, a downwardly concave curved surface, an upwardly convex curved surface, or the same width as the wide portion (5). 9 . parallel planes. 9 . The high-efficiency photovoltaic ribbon according to claim 6 , wherein the height h of the fins is 0.01mm≦h≦0.3mm. 10 . 10 . The high-efficiency photovoltaic ribbon according to claim 6 , wherein the width L of the fins is 0.01mm≦L≦0.3mm. 11 . 11. The high-efficiency photovoltaic welding strip according to claim 10, characterized in that: the length a of the side surface (3) is 0.01mm≤a≤0.5mm. 12. The high-efficiency photovoltaic ribbon according to claim 1, wherein the ratio between the width La of the narrow portion (4) and the width Lb of the wide portion (5) is in the range of 0.01-0.5. 13. The high-efficiency photovoltaic welding strip according to claim 1, wherein the angle θ between the preset effective reflective surfaces (6) on both sides of the welding strip is 72°≤θ≤101.5°. 14 . The high-efficiency photovoltaic welding strip according to claim 13 , wherein the angle θ between the preset effective reflective surfaces (6) on both sides of the welding strip is 83.6°≤θ≤95.7°. 15 . 15. The high-efficiency photovoltaic welding tape according to claim 1, characterized in that: the two side surfaces (3) of the conductive base tape (1) are arranged symmetrically with each other. 16. The high-efficiency photovoltaic ribbon according to claim 1, wherein the narrow part (4) and the wide part (5) are both approximately flat, wherein the narrow part (4) and the wide part (5) are respectively There is a corresponding virtual plane, the vertical distance from any point on the surface of the narrow part (4) or the wide part (5) to its corresponding virtual plane is less than 0.03mm, and the angle between the two virtual planes is not greater than 15° . 17. The high-efficiency photovoltaic ribbon of claim 16, wherein the two virtual planes are parallel to each other. 18. The high-efficiency photovoltaic soldering tape according to claim 1, characterized in that: the solder layer (2) is evenly coated on the conductive base tape (1), and the difference between the maximum value and the minimum value of the thickness of the solder layer (2) not more than 0.015mm. 19. The high-efficiency photovoltaic solder ribbon according to claim 18, characterized in that: the thickness b of the solder layer (2) is 0.007mm≤b≤0.025mm.

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