TWI703738B - Solar cell - Google Patents

Abstract

A solar cell includes a plurality of conductive pads, a plurality of bus lines, a plurality of conductive wires, and a plurality of fingers. The conductive pads are arranged in a first direction. The bus lines are respectively located between the conductive pads and extend in the first direction, and gaps are between the bus lines and the adjacent conductive pads. The conductive wires extend in the first direction and are located above the conductive pads and the bus lines. A ratio of a maximum width of each of the conductive pads to a diameter of each of the corresponding conductive wires is greater than or equal to 2.5 and less than or equal to 6. The fingers are arranged in the first direction and extend in a second direction.

Description

Solar battery

This disclosure is about a solar cell.

In recent years, as the problem of energy shortages has become increasingly serious, various alternative energy sources have continued to emerge. Among the many alternative energy sources, the solar energy industry is the most promising. Solar cells can convert light energy into electrical energy, and sunlight is the main source of light energy. Since solar cells do not generate greenhouse gases during the conversion process, a green energy environment can be realized.

With the progress and development of the solar energy industry, solar cells have recently been widely used in various electronic products. However, in the production process of solar cells, the wire has changed from a flat type to a round type. During the manufacturing process, it is often faced with the situation of solder accumulation and agglomeration, which leads to incomplete soldering of the wires, resulting in empty soldering, and further Affect the process yield and product reliability of solar cell modules.

One technical aspect of this disclosure is a solar cell.

A solar cell includes a plurality of conductive pads, a plurality of bus bars, a plurality of wires, and a plurality of bus sub-lines. Conductive pads are arranged in the first direction Column. The bus bars are respectively located between the conductive pads and extend along the first direction. There is an interval between the bus bar and the adjacent conductive pad. The wire extends along the first direction and is located above the conductive pad and the bus bar, and the ratio of the maximum width of the conductive pad to the diameter of the corresponding wire is greater than or equal to 2.5 and less than or equal to 6. The bus sub-lines are arranged in the first direction and extend along the second direction.

In an embodiment of the present disclosure, the first direction is substantially perpendicular to the second direction, and the bus sub-line intersects the bus bus.

In an embodiment of the present disclosure, the conductive pad has a through hole or a recess.

In an embodiment of the present disclosure, the conductive pad has two opposite recesses, and the connecting segment between the two bottom points of the two recesses has a connecting distance L1, and the side of the conductive pad parallel to the connecting segment has a length L2, and L1 The ratio to L2 is greater than or equal to 0.1 and less than or equal to 0.9.

In an embodiment of this disclosure, the conductive pad has a through hole and two opposite recesses, and the through hole is located on the connecting section of the two recesses, and the side of the through hole parallel to the connecting section has a width L3, and the conductive pad is parallel The side of the connecting segment has a length L2, and the ratio of L3 to L2 is greater than or equal to 0.1 and less than or equal to 0.9.

In an embodiment of the present disclosure, the conductive pads are arranged equidistantly in the first direction.

In an embodiment of the present disclosure, the cross section of the wire is circular or oval.

In an embodiment of the present disclosure, a conductive structure is further included, which is configured to fix the wire to the conductive pad and the bus bar. An angle between the conductive structure and the conductive pad is greater than or equal to 43° and less than or equal to 65°.

In an embodiment of the present disclosure, an end bus bar is further included, and the conductive pad includes an end conductive pad. The terminal bus bar is located between the terminal conductive pad and the side of the solar cell.

In one embodiment of the present disclosure, it further includes two end bus auxiliary lines, and the end bus auxiliary lines extend from the end conductive pad to the side of the solar cell. The end bus bar is located between the end bus auxiliary lines, and the end bus bar and the end bus auxiliary line are parallel to each other or jointly form a radial shape.

In an embodiment of the present disclosure, the bus sub-line intersects the end bus auxiliary line and the end bus bus.

In an embodiment of the present disclosure, the maximum length of the conductive pad is approximately equal to the maximum width of the conductive pad.

In an embodiment of the present disclosure, the solar cell further includes a plurality of auxiliary bus lines, which are respectively located on two sides of the conductive pad parallel to the first direction, extend along the first direction and protrude from the conductive pad. Two ends of the auxiliary bus line in the first direction are respectively connected to adjacent bus sub-lines.

According to the above-mentioned embodiments of the present disclosure, the bus bar is located between adjacent conductive pads and there is a gap between adjacent conductive pads, and the ratio of the maximum width of the conductive pad to the diameter of the corresponding wire is greater than or equal to 2.5 and less than or equal to 6. Therefore, the solder is not easy to accumulate and agglomerate on both ends of the conductive pad adjacent to the bus bar. As a result, the conditions that lead to the incomplete welding of the wires and the occurrence of empty welding can be reduced, and the manufacturing yield and product reliability of the solar cell module can be improved.

100, 100a, 100b‧‧‧Solar cell

110‧‧‧Conductive pad

110a‧‧‧End conductive pad

112‧‧‧Concave

114‧‧‧Through hole

120‧‧‧Confluence bus

120a‧‧‧End busbar

130‧‧‧Confluence sub-line

140‧‧‧Conductive structure

150‧‧‧Wire

160‧‧‧ Confluence auxiliary line

160a‧‧‧End Confluence Auxiliary Line

d‧‧‧interval

L1‧‧‧Connection distance

L2‧‧‧Length

L3‧‧‧Width

S‧‧‧side

Lm‧‧‧Maximum length

Wm‧‧‧Maximum width

D1‧‧‧First direction

D2‧‧‧Second direction

D‧‧‧diameter

θ‧‧‧angle

6-6、11-11‧‧‧Line segment

In order to make the above and other objects, features, advantages and embodiments of the present invention more comprehensible, detailed descriptions of the accompanying drawings are as follows: Figure 1 shows a top view of a solar cell according to an embodiment of the present disclosure.

Fig. 2 shows a partial enlarged view of the solar cell of Fig. 1.

FIG. 3 shows a top view of a solar cell according to an embodiment of the present disclosure.

Fig. 4 shows a partial enlarged view of the solar cell of Fig. 3.

Fig. 5 is a top view of the solar cell of Fig. 4 after the wires are fixed with a conductive structure.

Fig. 6 shows a cross-sectional view of the solar cell of Fig. 5.

Fig. 7 shows a partial enlarged view of the solar cell of Fig. 1.

Fig. 8 is a top view of the solar cell of Fig. 7 after the wires are fixed with a conductive structure.

Fig. 9 shows a top view of conductive pads of different shapes in the solar cell of Fig. 1.

FIG. 10 is a partial enlarged view of a solar cell according to another embodiment of the present disclosure.

Fig. 11 shows a cross-sectional view of the solar cell of Fig. 10 after a conductive structure is used to fix the wires.

Hereinafter, a plurality of implementation manners of the present disclosure will be disclosed in schematic form. For the sake of clarity, many practical details will be described in the following description. However, it should be understood that these practical details should not be used to limit this disclosure. In other words, in some implementations of this disclosure, these practical details are unnecessary. In addition, in order to simplify the drawings, some conventionally used structures and elements will be shown in a simple schematic manner in the drawings.

It should be understood that when an element such as a layer, film, region, or substrate is referred to as being "on" or "connected" to another element, it can be directly on or connected to the other element, or Intermediate elements may also be present. In contrast, when an element is referred to as being "directly on" or "directly connected to" another element, there are no intervening elements. As used herein, "connection" can refer to physical and/or electrical connection. Furthermore, "electrical connection" or "coupling" can mean that there are other elements between two elements.

As used herein, "approximately", "approximately", or "substantially" includes the stated value and the average value within the acceptable deviation range of the specific value determined by a person of ordinary skill in the art, taking into account the measurement and A certain amount of measurement-related error (ie, the limitation of the measurement system). For example, "about" can mean within one or more standard deviations of the stated value, or within ±30%, ±20%, ±10%, ±5%. Furthermore, the "about", "approximate" or "substantially" used herein can select a more acceptable deviation range or standard deviation based on optical properties, etching properties or other properties, and not one standard deviation can be applied to all properties .

FIG. 1 shows a top view of a solar cell 100 according to an embodiment of the present disclosure. FIG. 2 is a partial enlarged view of the region R1 of the solar cell 100 in FIG. 1. FIG. Referring to FIGS. 1 and 2 at the same time, the solar cell 100 includes a plurality of conductive pads 110, a plurality of busbars 120 and a plurality of busbars 130. The conductive pads 110 are arranged in the first direction D1. The bus bars 120 are respectively located in the conductive The pads 110 extend along the first direction D1. There is an interval d between the bus bar 120 and the adjacent conductive pad 110. The bus sub-lines 130 are arranged in the first direction D1 and extend along the second direction D2.

FIG. 3 shows a top view of a solar cell 100 according to an embodiment of the present disclosure. FIG. 4 is a partial enlarged view of the region R1 of the solar cell 100 in FIG. 3. Referring to FIGS. 3 and 4 at the same time, the solar cell 100 further includes a plurality of wires 150. The wire 150 extends along the first direction D1 and is located above the conductive pad 110 and the bus bar 120. The ratio of the maximum width Wm of the conductive pad 110 to the diameter D of the corresponding wire is greater than or equal to 2.5 and less than or equal to 6.

In this embodiment, since the bus bar 120 is located between the adjacent conductive pads 110, there is a gap d between the bus bar 120 and the adjacent conductive pad 110, and the maximum width Wm of the conductive pad 110 is connected to the corresponding wire 150 The ratio of the diameter D is designed to be greater than or equal to 2.5 and less than or equal to 6, so the solder is not easy to accumulate and agglomerate on the two ends of the conductive pad 110 adjacent to the bus bar 120. As a result, the conditions that lead to the incomplete welding of the wire 150 and the occurrence of the empty welding situation can be reduced, and the production rate and product reliability of the solar cell 100 module can be improved.

In this embodiment, the bus bars 120 located between the conductive pads 110 are arranged along the first direction D1. In addition, the bus sub-lines 130 may extend along the second direction D2 and be arranged at equal distances or unequal distances in the first direction D1, depending on the needs of the designer, and are not intended to limit the disclosure. In this embodiment, the first direction D1 and the second direction D2 are substantially perpendicular to each other. In other words, the bus bar 120 and the bus sub-line 130 are arranged substantially perpendicular to each other. In addition, the conductive pad 110, the bus bar 120, and the bus sub-line 130 can be made of materials containing silver paste Completed, but not used to limit the disclosure. Since there is a space d between the bus bar 120 and the adjacent conductive pad 110, the cost of silver paste for manufacturing the bus bar 120 can be saved, thereby reducing the manufacturing cost of the solar cell 100. In addition, in this embodiment, the maximum length Lm of the conductive pad 110 is approximately equal to the maximum width Wm of the conductive pad 110, but it is not used to limit the disclosure. For example, the maximum length Lm of the conductive pad 110 may be greater than or less than that of the conductive pad 110. Maximum width Wm. In addition, the conductive pads 110 may be arranged at equal distances in the first direction D1, for example.

FIG. 5 is a top view of the solar cell 100 in FIG. 4 after the conductive structure 140 is used to fix the wire 150. In this embodiment, the wire 150 and the bus bar 120 substantially overlap. In addition, the wire 150 extends through the space d between the bus bar 120 and the conductive pad 110. In this embodiment, the solar cell 100 further includes a conductive structure 140. The conductive structure 140 is located above the conductive pad 110 and the bus bar 120 and is configured to fix the wire 150 above the conductive pad 110 and the bus bar 120. If viewed from a top perspective (ie, the viewing angle of FIG. 5), it can be seen that the conductive structure 140 at least partially covers the space d between the bus bar 120 and the conductive pad 110.

In this embodiment, the conductive structure 140 may be formed of solder covering the wire 150. The solder may be made of an alloy containing tin (such as a tin-silver-copper alloy or a tin-lead alloy), but it is not intended to limit the disclosure. Specifically, the wire 150 can be placed above the conductive pad 110 and the bus bar 120, and the solder around the wire 150 can be heated by the energy provided by the infrared light. The heated solder gradually melts and flows along the wire 150, and then chemically reacts with the silver on the surface of the conductive pad 110 and the busbar 120 to form an intermetallic compound. The formed intermetallic compound is immediately after cooling. It is the conductive structure 140 shown in FIG. 5. The conductive structure 140 can fix the wire 150 to the conductive pad 110 and above the bus bar 120 to complete the welding of the wire 150.

In this embodiment, since the conductive pads 110 in the solar cell 100 are equally spaced on the solar cell 100, and each conductive pad 110 has the same area, the adjacent conductive pads 110 (and each conductive pad 110) The amount of solder that can be carried by the 110 itself) is substantially the same, so that the solder flowing around the wire 150 can be evenly distributed between the adjacent conductive pads 110 (and above each conductive pad 110). In addition, since the maximum length Lm of the conductive pad 110 is approximately equal to the maximum width Wm of the conductive pad 110, the distance that the solder can flow along the maximum length Lm of the conductive pad 110 and the maximum width Wm of the solder along the conductive pad 110 The distance between is substantially the same, so that the solder can be evenly distributed on the conductive pad 110.

Referring to FIGS. 1 and 2 at the same time, the solar cell 100 further includes a plurality of auxiliary bus lines 160. The auxiliary bus lines 160 are respectively located on two sides of the conductive pad 110 parallel to the first direction D1. In addition, the bus auxiliary line 160 extends along the first direction D1 and protrudes from the conductive pad 110, and two ends in the first direction D1 are respectively connected to the adjacent bus sub-lines 130. Since the bus auxiliary line 160 is connected to the adjacent two bus lines 130, the conduction of electrons will not be interrupted by the interval d between the bus bus 120 and the conductive pad 110, and the connected bus line 130 and the bus auxiliary line 130 The line 160 provides more path options for electrons, thereby reducing the overall resistance of the solar cell 100 and improving the efficiency of the solar cell 100 in energy conversion. In this embodiment, the auxiliary bus line 160 may be made of the same material as the conductive pad 110, the bus bus 120, and the bus sub-line 130, that is, the auxiliary bus line 160 may be made of a material including silver paste, but It is not used to limit this disclosure.

Fig. 6 shows a cross-sectional view of the solar cell in Fig. 5 along line 6-6. In this embodiment, the wire 150 of the solar cell 100 has a circular or oval cross section. Compared with the traditional rectangular cross-section, the circular or elliptical cross-section of the wire 150 has no edges and corners, so that the solder around the wire 150 is more likely to be scattered in the horizontal direction without hoarding and gathering on the top of the wire 150. In addition, when sunlight is incident on the wire 150 above the solar cell 100, since the surface of the wire 150 with a circular or elliptical cross-section is a continuous arc, it helps to reflect the incident sunlight to the surface of the solar cell 100 , In order to effectively increase the light utilization rate of the solar cell 100. In addition, in this embodiment, the conductive structure 140 and the conductive pad 110 have an angle θ greater than or equal to 43° and less than or equal to 65°, which is not used to limit the disclosure. When the value of the angle θ is smaller, the adhesion between the conductive structure 140 and the conductive pad 110 is stronger, and therefore, the conductive structure 140 can withstand greater pulling force and fix the wire 150 to the conductive pad 110 more firmly.

FIG. 7 is a partial enlarged view of the region R2 of the solar cell 100 in FIG. 1. The top view of the solar cell 100 in FIG. 8 and FIG. 7 after the conductive structure 140 is used to fix the wire 150. Referring to FIG. 7, the conductive pad 110 in the solar cell 100 includes an end conductive pad 110 a, and the solar cell 100 further includes an end bus bar 120 a between the end conductive pad 110 a and the side S of the solar cell 100. The terminal bus bar 120a extends along the first direction D1 and has a space d between the adjacent terminal conductive pad 110a. In addition, the end bus bar 120a and the bus bar 120 located between the conductive pads 110 are aligned with each other along the first direction D1. Referring to Figure 8, since the end bus bar 120a can be made of a material containing silver paste, it can react with the solder covering the wire 150 to form a conductive structure 140, which in turn helps the end of the wire 150 to be fixed during the soldering process To the end The bus bar 120a is connected with almost no positional deviation. In this way, the wire 150 can always extend along the first direction D1 between the terminal conductive pad 110 a and the side S of the solar cell 100.

As shown in Figs. 7 and 8, in the present embodiment, the solar cell 100 further includes two end bus auxiliary lines 160a. In addition, the end bus bar 120a is located between the two end bus auxiliary lines 160a. In this embodiment, the end bus bar 120a and the two end bus auxiliary lines 160a can jointly form a radial shape, but it is not used to limit the disclosure. In other embodiments, the end bus bar 120a and the two end bus auxiliary lines 160a may be parallel to each other along the first direction D1. When the end of the wire 150 has a slight positional offset, the two-end confluence auxiliary line 160a can help to produce visual effects, so that the end of the wire 150 is visually offset less than the actual offset. Obviously, the effect of improving the appearance of the solar cell 100 module is achieved.

As shown in Figures 5 and 8, in this embodiment, the busbar 130 is arranged above the solar cell 100 in addition to intersecting the busbar 120, the busbar 130 also converges with the end busbar 120a and both ends. The auxiliary lines 160a are intersected and arranged above the solar cell 100. This structural configuration provides more path options for electrons (ie, reduces the path length of electron conduction), thereby reducing the overall resistance of the solar cell 100, so as to improve the efficiency of the solar cell 100 in energy conversion. In addition, since the bus bar 130 and the end bus bar 120a are arranged to intersect each other, when the end of the wire 150 is slightly shifted during the welding process, the bus bar 130 adjacent to the end bus bar 120a can be caught in time And fix the offset wire 150 so that the end of the wire 150 will not be excessively severely displaced.

FIG. 9 is a top view of conductive pads 110 of different shapes in the solar cell 100 of FIG. 1. FIG. As shown in Figure 9, the conductive pads 110 of (a) and (e) are "square", the conductive pads 110 of (b) and (f) are "proximity type", and the conductive pads of (c) and (g) 110 is a "separated type", and the conductive pads 110 of (d) and (h) are of a "disconnected type". Among them, the aforementioned conductive pad 110 can be further divided into the "horizontal type" of (a) to (d) and the "vertical type" of (e) to (h). In the present embodiment, the "proximity type", the "separated type" and the "disconnected type" are shapes derived from the "square", and can be collectively referred to as the "spindle type". Specifically, the designer can modify the shape of the "square" (the maximum length Lm is approximately equal to the maximum width Wm) to form "adjacent", "separated" and "disconnected" shapes.

As shown in Figure 9, in the "proximity type" and "separation type" embodiments, the conductive pad 110 has two opposite recesses 112, and the connecting segment between the two bottom points R of the two recesses 112 has a connecting distance L1 , And the conductive pad 110 has a length L2 parallel to the side of the connection segment, and the ratio of the connection distance L1 to the length L2 is greater than or equal to 0.1 and less than or equal to 0.9. The difference between the "proximity type" and the "separated type" lies in the shapes of the two recesses 112. The "proximity type" conductive pad 110 has two triangular recesses 112, and the "separated" conductive pad 110 has two trapezoidal recesses 112. In addition, according to the directional relationship between the connecting segment of the two bottom points R of the two recesses 112 and the first direction D1, the "proximity type" and "separation type" conductive pads 110 can be divided into "horizontal type" and "Vertical". Specifically, if the connecting segment between the two bottom points R of the two recesses 112 is parallel to the first direction D1, the conductive pad 110 is "horizontal"; if the connecting segment between the two bottom points R of the two recesses 112 is perpendicular to the first direction D1 In one direction D1, the conductive pad 110 is "vertical". For example, if the conductive pad 110 has two triangular concave portions 112, and the connecting segment of the two bottom points R of the two concave portions 112 is parallel to the first In one direction D1, the conductive pad 110 is a "horizontal proximity type".

As shown in FIG. 9, in the "disconnected" embodiment, the conductive pad 110 has two trapezoidal opposite recesses 112, and the linear distance between the two bottom points R of the two recesses 112 forms a connecting segment. In addition, the conductive pad 110 also has a rectangular through hole 114 on the connecting section, and the through hole 114 has a width L3 parallel to the side of the connecting section, and the conductive pad 110 has a length L2 parallel to the side of the connecting section. , And the ratio of the width L3 to the length L2 is greater than or equal to 0.1 and less than or equal to 0.9. Similar to the "proximity type" and "separation type" embodiments, if the connecting section of the two bottom points R of the two recesses 112 is parallel to the first direction D1, the conductive pad 110 is "horizontal"; The connecting segment between the two bottom points R is perpendicular to the first direction D1, so the conductive pad 110 is "vertical". In addition, in this embodiment, the width L3 of the through hole 114 of the conductive pad 110 of the "horizontal disconnection type" is parallel to the first direction D1 (perpendicular to the second direction D2), while the "vertical disconnection type" The direction of the width L3 of the through hole 114 of the conductive pad 110 is perpendicular to the first direction D1 (parallel to the second direction D2).

It should be understood that, for convenience of description, FIG. 9 only shows 8 shapes of the conductive pad 110, but it is not limited thereto. In practical applications, the conductive pad 110 can have various other shapes derived from the eight shapes. For example, the two recesses 112 may have shapes other than triangles and trapezoids (such as circular, rectangular, or irregular shapes), and the through holes 114 may also have shapes other than rectangles. In addition, the through holes or recesses of the conductive pad 110 are not limited to the above. For example, the conductive pad 110 may only have one or more through holes, or the conductive pad 110 may only have one or more recesses, or the conductive pad 110 There may be one or more through holes/one or more recesses at the same time. In addition, for the conductive pad 110 of the "vertical proximity type" and the "vertical separation type", the ratio of the connection distance L1 to the length L2 can be guided The diameter D of the wire 150 is designed to have different values. For example, when the diameter D of the wire 150 is small, the ratio of the connection distance L1 to the length L2 can be designed to be a small value (for example, 0.2); when the diameter D of the wire 150 is large, the connection distance L1 and The ratio of the length L2 can be designed to be a larger value (for example, 0.8), but the value of this ratio is not used to limit the disclosure, and the designer can determine the actual value of the ratio after comprehensive evaluation.

In this embodiment, the "spindle" conductive pad 110 is designed so that the conductive pad 110 has multiple openings (ie, recesses 112 and through holes 114). This design makes the solder around the wire 150 tend to flow during the soldering process To the edge of the opening in the conductive pad 110, it is therefore easier to spill in the horizontal direction at various angles to react with the edge of the opening of the conductive pad 110 to form the conductive structure 140. In this way, the heated solder can be evenly distributed over the conductive pad 110 and around the wire 150 and is not easy to be hoarded and gathered on the top of the wire 150, so that there is almost no accumulation of the conductive structure 140 on the top of the wire 150 after cooling. Since the top of the conductive pad 110 only has a thin layer of conductive structure 140, the solar cell 100 is not prone to micro crack defects in the subsequent lamination process, thereby improving the manufacturing process of the solar cell 100 module Rate and product reliability. In addition, since the conductive pad 110 can be made of a material containing silver paste, the concave portion 112 and the through hole 114 can save the amount of silver paste used, thereby reducing the material cost.

It should be understood that the connection relationships, materials, and effects of the components that have been described will not be repeated, and will be described first. In the following description, the structure of the solar cells 100a and 100b of two different embodiments will be described in detail.

Figure 10 shows the solar energy according to another embodiment of the present disclosure A partial enlarged view of the battery 100a. FIG. 11 is a cross-sectional view of the solar cell 100a of FIG. 10 along the line 11-11 after the conductive structure 140 is used to fix the wire 150. As shown in FIGS. 10 and 11, the conductive pad 110 of the solar cell 100a is of a "horizontal disconnection type", and the cross section of the wire 150 is circular. The conductive structure 140 and the wire 150 are located above the conductive pad 110 and the bus bar 120 and extend along the first direction D1, and cover the two recesses 112 and the through hole 114 of the conductive pad 110. In addition, the conductive structure 140 and the conductive pad 110 have an angle θ of 46° to 50°. Such a small angle θ enables a strong adhesion between the conductive structure 140 and the conductive pad 110, so that it can withstand greater pulling force and fix the wire 150 to the conductive pad 110 more firmly.

In the above embodiment, the top of the conductive line 150 above the conductive pad 110 only has a thin layer of conductive structure 140 (see Figure 11). It can be seen that the shape design of the conductive pad 110 matches the shape design of the cross section of the conductive pad 110 and the conductive pad 110 and The spacing d between the bus bars 120 can effectively improve the overflow of the solder in the horizontal direction, thereby forming a more stable conductive structure 140 to effectively fix the wires 150 above the conductive pad 110 and the bus bar 120.

In this embodiment, since the bus bars 120 in the solar cells 100, 100a, 100b are located between adjacent conductive pads 110, there is a gap d between the bus bars 120 and the adjacent conductive pads 110, and the distance between the conductive pads 110 The ratio of the maximum width Wm to the diameter D of the corresponding wire is greater than or equal to 2.5 and less than or equal to 6, so the solder is not easy to accumulate and agglomerate on the two ends of the conductive pad 110 adjacent to the bus bar 120. As a result, the conditions that lead to the incomplete welding of the wire 150 and the occurrence of the empty welding situation can be reduced, and the manufacturing yield and product reliability of the solar cell 100, 100a, and 100b modules can be improved.

Although this disclosure has been disclosed in the implementation manner as above, it is not intended to To limit this disclosure, anyone who is familiar with this technique can make various changes and modifications without departing from the spirit and scope of this disclosure. Therefore, the scope of protection of this disclosure shall be subject to the scope of the attached patent application. .

100‧‧‧Solar cell

110‧‧‧Conductive pad

120‧‧‧Confluence bus

130‧‧‧Confluence sub-line

160‧‧‧ Confluence auxiliary line

d‧‧‧interval

Lm‧‧‧Maximum length

Wm‧‧‧Maximum width

D1‧‧‧First direction

D2‧‧‧Second direction

Claims (13)

A solar cell includes: a plurality of conductive pads arranged in a first direction; a plurality of bus bars are respectively located between the conductive pads and extend along the first direction, and each of the bus bars and phase There are spaces between the adjacent conductive pads; a plurality of wires, wherein the wires extend along the first direction, and are located above the conductive pads and the bus bars, and the maximum width of each of the conductive pads The ratio to the corresponding diameter of each of the wires is greater than or equal to 2.5 and less than or equal to 6; and a plurality of bus lines are arranged in the first direction and extend along a second direction. The solar cell according to claim 1, wherein the first direction is substantially perpendicular to the second direction, and the bus sub-lines intersect the bus bus bars. The solar cell according to claim 1, wherein at least one of the conductive pads has at least one through hole or at least one recess. The solar cell according to claim 1, wherein at least one of the conductive pads has two opposite recesses, and a connecting section of the two bottom points of the two recesses has a connecting distance L1, and the conductive pads are at least One side parallel to the connecting segment has a length L2, and the ratio of L1 to L2 is greater than equal Within 0.1 and less than or equal to 0.9. The solar cell according to claim 1, wherein at least one of the conductive pads has a through hole and two opposite recesses, and the through hole is located on a connecting section of the two recesses, and the through hole is parallel to the connection One side of the line segment has a width L3, and at least one of the conductive pads parallel to one side of the connection segment has a length L2, and the ratio of L3 to L2 is greater than or equal to 0.1 and less than or equal to 0.9. The solar cell according to claim 1, wherein the conductive pads are arranged equidistantly in the first direction. The solar cell according to claim 1, wherein a cross section of the wire is circular or oval. The solar cell according to claim 1, further comprising a conductive structure configured to fix the wire above the conductive pads and the bus bars, wherein an angle is formed between the conductive structure and each of the conductive pads , And the angle is greater than or equal to 43° and less than or equal to 65°. The solar cell according to claim 1, further comprising at least one terminal busbar, and the conductive pads comprise at least one terminal conductive pad, wherein the terminal busbar is located between the terminal conductive pad and one side of the solar cell . The solar cell according to claim 9, further comprising at least two end busbars, and the two end busbars extend from the end conductive pad to the side of the solar cell, and the end busbars are located at the two ends Between the auxiliary bus lines, and the end bus bar and the two end bus auxiliary lines are parallel to each other or jointly form a radial shape. The solar cell according to claim 10, wherein the bus sub-lines intersect the two end bus auxiliary lines and the end bus bus. The solar cell according to claim 1, wherein the maximum length of each of the conductive pads is approximately equal to the maximum width of each of the conductive pads. The solar cell according to claim 1, further comprising a plurality of auxiliary bus lines, which are respectively located on two sides of the conductive pads parallel to the first direction, extend along the first direction and protrude from the conductive pads, Two ends of each of the auxiliary bus lines in the first direction are respectively connected to the adjacent bus sub-lines.

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