TW202023178A - Half-cut solar cell module - Google Patents

Abstract

A half-cut solar cell module is provided. The half-cut solar cell module has a light receiving face and a backlight face opposite to the light receiving face, and comprises a first cell area, a second cell area and a wiring area arranged in a first direction, wherein the wiring area is located between the first cell area and the second cell area. The half-cut solar cell module comprises a half-cut solar cell array, two first bus ribbons, two second bus ribbons, an isolation sheet, a plurality of bonding wires, a plurality of bypass diodes, and one junction box. The half-cut solar cell array located in the first cell area and the second cell area comprises multi-strings half-cut solar cells arranged in a second direction. The half-cut solar cell comprises a cutting side and a non-cutting side opposite to the cutting side. The second direction and the first direction are orthogonal. The two first bus ribbons and the two second bus ribbons are located on the backlight face and located in the wiring area. The two first bus ribbons and the two second bus ribbons are respectively comprise a long portion and a short portion. The long portion of the first bus ribbon and the long portion of the second bus ribbon are partially overlapped. The isolation sheet is located between the first bus ribbon and the second bus ribbon and comprises two first outlets. The two second bus ribbons are respectively extended from a surface of the isolation sheet to the other surface of the isolation sheet by two first outlets. Each bonding wire is connected to a string of the half-cut solar cell and one of the first bus ribbon and the second bus ribbon in the first direction. Each bypass diode is connected between the first bus ribbon and the second bus ribbon or is connected between the two second bus ribbons. The plurality of bypass diodes are located in the one junction box.

Description

Half-cut solar cell module

The present invention relates to a solar cell module, and more particularly to a half-cut solar cell module.

The half-cut solar cell is formed by cutting the solar cell in half, and the half-cut solar cell is arranged in an array to obtain the half-cut solar cell module. The half-cut solar cell module can effectively reduce the electrical loss in the module and increase its conversion efficiency output.

Based on the existing half-cut solar cell technology, the current trend is to set the wiring area for external wiring between the two battery areas to achieve the best conversion efficiency output. However, taking a half-cut solar cell module in a 6x10 array (6 rows X 10 columns) as an example, since a bypass diode is required between every two rows of half-cut solar cells, there will be a total of three bypasses in the wiring area With the diode, there are three locations in the wiring area that require external wiring and three holes in the backplane that need to be aligned synchronously, which will increase the difficulty of the manufacturing process and therefore reduce the yield.

The present invention provides a half-cut solar cell module, which can reduce the difficulty of the manufacturing process and therefore increase the yield.

The half-cut solar cell module of the present invention has a light-receiving surface and a backlight surface opposite to the light-receiving surface, and includes a first battery area, a second battery area, and a first battery area arranged in a first direction. Between the wiring area. The half-cut solar cell module includes a half-cut solar cell array, two first bus bars and two second bus bars, insulating sheets, multiple sets of welding wires, multiple bypass diodes, and a junction box. The half-cut solar cell array is located in the first battery area and the second battery area and includes multiple strings of half-cut solar cells arranged in the second direction. The half-cut solar cell includes a cut side and a non-cut side. The cutting side is opposite to the non-cutting side in the first direction. The second direction is orthogonal to the first direction. The two first bus bars and the two second bus bars are located on the backlight surface and in the wiring area. The two first bus bars and the two second bus bars each include a long portion and a short portion. The long portion of the first bus bar partially overlaps the long portion of the second bus bar. The insulating sheet is arranged between the first bus bar and the second bus bar and includes two first outlet ports. Each of the two second bus bars extends from one surface of the insulating sheet to the other surface of the insulating sheet through the two first outlet openings. Each of the multiple sets of bonding wires connects a string of half-cut solar cells and one of the two first bus bars or the two second bus bars in the first direction. Each bypass diode of the plurality of bypass diodes is connected between adjacent first and second bus bars or between two second bus bars. Multiple bypass diodes are arranged in a junction box.

In an embodiment of the present invention, the above-mentioned insulating sheet includes a first groove facing the first battery area. The first groove is located between the two first outlets. The width of the first groove in the first direction is between the distance from the welding line to the edge of the half-cut solar cell in the first direction and the distance from the welding line to the first bus bar in the first direction. The width of the first groove in the second direction is greater than the width of the short portions of the two second bus bars plus the distance between the short portions of the two second bus bars.

In an embodiment of the present invention, the cross section of the aforementioned first groove is rectangular.

In an embodiment of the present invention, the aforementioned insulating sheet further includes two second grooves facing the first battery area. The two second grooves are located at the corners of the insulating sheet. The width of the second groove in the first direction is between the width of the half-cut solar cell in the first battery area covered by the insulating sheet in the first direction and the second bus bar to one side of the insulating sheet in the first battery area The distance between the sides. The width of the second groove in the second direction is smaller than the distance from the second bus bar to one side of the insulating sheet in the second direction.

In an embodiment of the present invention, the cross section of the aforementioned second groove is triangular.

In an embodiment of the present invention, the aforementioned insulating sheet further includes two second grooves facing the first battery area. The two second grooves are located at the corners of the insulating sheet. The width of the second groove in the first direction is between the width of the half-cut solar cell in the first battery area covered by the insulating sheet in the first direction and the distance from the welding line to the edge of the half-cut solar cell in the first direction.

In an embodiment of the present invention, the cross section of the aforementioned second groove is rectangular.

In an embodiment of the present invention, when the welding wire is located on the light-receiving surface of the half-cut solar cell covered by the short part of the second bus bar and is connected to the second bus bar, the non-cut side of a string of half-cut solar cells is on the first bus bar. Face the wiring area in one direction. When the welding wire is located on the backlight surface of the half-cut solar cell covered by the short part of the second bus bar and connected to the second bus bar, the cut side of a string of half-cut solar cells faces the wiring area in the first direction.

In an embodiment of the present invention, the long portions included in each of the two first bus bars and the two second bus bars extend in the second direction. The short portions included in each of the two first bus bars and the two second bus bars extend in the first direction. The end of the long part is connected to the end of the short part.

In an embodiment of the present invention, the above-mentioned half-cut solar cell module further includes a back sheet. The backplane includes a second outlet. The short portions of the two first bus bars and the two second bus bars each extend from one surface of the back plate to the other surface of the back plate through the second outlet port so as to correspond to the one located on the other surface of the back plate. Multiple bypass diodes in the junction box are connected.

In an embodiment of the present invention, the above-mentioned half-cut solar cell module further includes a plurality of third bus bars. A plurality of third bus bars are located on the side of the first battery area and the second battery area away from the wiring area.

In an embodiment of the present invention, each set of bonding wires described above connects a string of half-cut solar cells and one of a plurality of third bus bars in the first direction.

Based on the above, the half-cut solar cell module of the present invention integrates multiple bypass diodes into a junction box to avoid manufacturing difficulties and reduce costs. In addition, the present invention can prevent the insulating sheet from covering the light-receiving surface of the half-cut solar cell, so as to reduce the power loss caused by shading.

In order to make the above-mentioned features and advantages of the present invention more obvious and understandable, the embodiments are specifically described below and described in detail in conjunction with the accompanying drawings.

Hereinafter, the present invention will be explained more fully with reference to the drawings of this embodiment. However, the present invention can also be embodied in various forms, and should not be limited to the embodiments described herein. The thickness of the layers and regions in the drawing will be exaggerated for clarity. The same or similar reference numbers indicate the same or similar elements, and the following paragraphs will not repeat them one by one. In addition, the directional terms mentioned in the embodiments, such as: up, down, left, right, front or back, etc., are only the directions referring to the attached drawings. Therefore, the directional terminology is used to illustrate rather than limit the invention.

FIG. 1A is a schematic top view of a backlight surface of a half-cut solar cell module according to an embodiment of the present invention. Fig. 1B is a schematic cross-sectional view according to the section line A-A' in Fig. 1A. Fig. 1C is a schematic cross-sectional view according to the section line B-B' in Fig. 1A. FIG. 1D is a circuit layout diagram of a backlight surface of a half-cut solar cell module according to an embodiment of the present invention. Fig. 2 is a schematic top view of a back sheet of a half-cut solar cell module according to an embodiment of the present invention. FIG. 3A is an enlarged schematic diagram according to an embodiment of the region R in FIG. 1A. FIG. 3B is an enlarged schematic diagram of another embodiment according to the region R in FIG. 1A.

Please refer to FIGS. 1A, 1B, 1C, 1D and 2 at the same time, the half-cut solar cell module 10 includes a back sheet 100, a half-cut solar cell array 110, two first bus bars 120, and two second bus bars 130 , Insulating sheet 140, multiple sets of welding wires 150, multiple bypass diodes 160, and a junction box 170. From another perspective, the half-cut solar cell module 10 includes a first battery area 10a, a second battery area 10b, and a wiring area 10c arranged in the first direction E1. The wiring area 10c is located between the first battery area 10a and the second battery area 10b, for example.

In an embodiment, the half-cut solar cell module 10 may further include a cover plate (not shown). For example, the above-mentioned cover plate and the back plate 100 sandwich the half-cut solar cell array 110 therein. The material of the aforementioned cover plate is, for example, glass. In addition, in an embodiment, the half-cut solar cell module 10 may further include a protective layer (not shown) disposed between the aforementioned glass substrate and the back plate. The aforementioned protective layer can protect the half-cut solar cell array 110 to prevent the half-cut solar cell array 110 from being directly impacted by external forces. The material of the above-mentioned protective layer may be, for example, Ethylene Vinyl Acetate (EVA), but the present invention is not limited to this.

Please continue to refer to FIGS. 1A, 1B, 1C, 1D, and 2, the half-cut solar cell module 10 has a light-receiving surface 110a and a backlight surface 110b. The light-receiving surface 110 a is, for example, the surface of the half-cut solar cell array 110 facing the cover plate (not shown), and the backlight surface 110 b is, for example, the surface of the half-cut solar cell array 110 facing the back plate 100. Sunlight may enter the solar cell array 110 from the light receiving surface 110a, for example.

In an embodiment, the backplane 100 includes an outlet 102, as shown in FIG. 2. The position of the outlet port 102 is, for example, set in the center of the back plate 100 and corresponds to the wiring area 10c. The two first bus bars 120 and the two second bus bars 130 can each extend from one surface of the back plate 100 to the other surface of the back plate 100 through the outlet 102, so as to be compatible with the other surface of the back plate 100. On the surface, a plurality of bypass diodes 160 in a junction box 170 are connected.

In one embodiment, the half-cut solar cell array 110 is located in the first battery area 10a and the second battery area 10b and includes a plurality of strings of half-cut solar cells 112 arranged in the second direction E2. In detail, the half-cut solar cell 112 is, for example, bisected, that is, the half-cut solar cell 112 includes a cut side 112S1 and a non-cut side 112S2. The cutting side 112S1 is opposed to the non-cutting side 112S2 in the first direction E1, for example. In one embodiment, the half-cut solar cells 112 are arranged in the first battery area 10a and the second battery area 10b in each of 10 along the first direction E1 and 6 along the second direction E2 to form a 6x10 array (6 rows X 10 columns). In an embodiment, the second direction E2 is orthogonal to the first direction E1. The half-cut solar cell array 110 is formed by cutting the general solar cells in half and connecting them in series. Therefore, the resistance between the half-cut solar cells 112 will decrease, and the output power will be greater than that of the traditional solar cell module. The solar cell array 110 has good conversion efficiency.

In an embodiment, the two first bus bars 120 and the two second bus bars 130 are located on the backlight surface 110b and in the wiring area 10c. The two first bus bars 120 and the two second bus bars 130 may, for example, be used to connect in parallel with each string of half-cut solar cells 112 located in the first battery area 10a and the second battery area 10b. The two first bus bars 120 include, for example, a long portion 120a and a short portion 120b, and the two second bus bars 130 also include, for example, a long portion 130a and a short portion 130b. The long portion 120a of the first bus bar 120 and the long portion 130a of the second bus bar 130 extend along the second direction E2, for example, and the short portion 120b of the first bus bar 120 and the short portion 130b of the second bus bar 130 extend along the first Extend in one direction E1. The end of the long portion 120a of the first bus bar 120 is connected to the short portion 120b, for example, and the end of the long portion 130a of the second bus bar 130 is connected to the short portion 130b, for example, to form an "L-shaped" structure, but the present invention Not limited to this. In an embodiment, the long portion 120a of the first bus bar 120 and the long portion 130a of the second bus bar 130 partially overlap. In detail, the long portion 120a of the first bus bar 120 and the long portion 130a of the second bus bar 130 are insulated by an isolation structure (for example, the insulating sheet 140 described below), and the backlight surface 110b is used as a reference. The long portion 120a of one bus bar 120 is located above the long portion 130a of the second bus bar 130 and an isolation structure is sandwiched between the two. As shown in FIGS. 2, 3A, and 3B, the short portion 120b of the first bus bar 120 and the short portion 130b of the second bus bar 130, for example, extend along the first direction E1 to concentrate in the area S, so as to facilitate subsequent The introduced multiple bypass diodes 160 arranged in a junction box 170 are connected.

In an embodiment, the insulating sheet 140 is disposed between the first bus bar 120 and the second bus bar 130. In detail, the insulating sheet 140 is located between the long portion 120a of the first bus bar 120 and the long portion 130a of the second bus bar 130 disposed in the wiring area 10c, and covers part of the half-cut solar energy in the first battery area 10a. The battery 112 and part of the half-cut solar battery 112 in the second battery area 10b. In this embodiment, the insulating sheet 140 is used to prevent the first bus bar 120 and the second bus bar 130 partially overlapping each other from being short-circuited due to contact. The insulating sheet 140 includes, for example, two first outlets 142, so that the two second bus bars 130 can each extend from one surface of the insulating sheet 140 to the other of the insulating sheet 140 through the two first outlets 142. surface. In detail, as described above, the long portions 130a of the two second bus bars 130 are covered by the insulating sheet 140, in order to make the short portions 130b of the second bus bars 130 and the short portions 120b of the first bus bar 120 borrow Connected by the bypass diode 160, a part of the long portion 130a of the second bus bar 130 passes through the first outlet port 142, so that the short portion 130b connected to the long portion 130a and the short portion 130b of the first bus bar 120 The parts 120b are on the same plane.

1A, 3A, and 3B at the same time, in this embodiment, the insulating sheet 140 includes a first groove 140a facing the first battery area 10a. Since the insulating sheet 140 includes two first outlets 142, a part of the insulating sheet 140 located between the first outlets 142 may cover a part of the light-receiving surface 110a of the half-cut solar cell 112 when installed. In order to avoid the above problem, part of the insulating sheet 140 between the first outlets 142 needs to be removed to form the first groove 140a. The first groove 140 a formed is, for example, located between the two first outlet openings 142. The cross section of the first groove 140a is, for example, a rectangle, but the present invention is not limited to this.

The width W1 of the first groove 140a in the first direction E1 is, for example, a distance D11 from the bonding wire 150 in the first direction E1 to the edge of the half-cut solar cell 112 and the bonding wire 150 in the first direction E1 to the first confluence The distance between the bars 120 is D22. In brief, D11<W1<D22. Since the half-cut solar cell 112 includes a cut side 112S1 and a non-cut side 112S2 opposite to each other in the first direction E1, the aforementioned edge of the half-cut solar cell 112 in the first direction E1 may be referred to as the non-cut side 112S2 or Cut side 112S1. In order to prevent part of the insulating sheet 140 located between the first outlet 142 from covering the light-receiving surface of the half-cut solar cell 112 or causing the welding wire 150 to be damaged due to contact with the insulating sheet 140, the first groove 140a is formed in the first direction E1 The width W1 needs to be at least greater than the distance D11 from the bonding wire 150 to the edge of the half-cut solar cell 112 in the first direction E1. However, if the width W1 of the first groove 140a in the first direction E1 is too large, part of the long portion 130a of the second bus bar 130 will be exposed and contact with the long portion 120a of the first bus bar 120. Short circuit. In order to avoid the above problems, the width W1 of the first groove 140a in the first direction E1 needs to be smaller than the distance D22 of the bonding wire 150 in the first direction E1 to the first bus bar 120 to prevent the second bus bar 130 from being long. The part 130a is exposed. The width W1 within the above range can ensure that the insulating sheet 140 will not cover the light-receiving surface 110a of the half-cut solar cell 112 or damage the bonding wire 150, and can avoid the problem of short circuit between the first bus bar 120 and the second bus bar 130. In an embodiment, the width W1 of the first groove 140a in the first direction E1 is 4 mm-9 mm.

The width W2 of the first groove 140a in the second direction E2 is, for example, greater than the distance D33 between the short portions 130b of the two second bus bars 130 plus the width W11 of the short portions 130b. In brief, D33+2*W11<W2. In this embodiment, since a part of the long portion 130a of the second bus bar 130 passes through the first outlet port 142, the short portion 130b connected to the long portion 130a and the short portion 120b of the first bus bar 120 On the same plane, in order to prevent the width W2 of the first groove 140a in the second direction E2 from being too small, so that the short portion 130b of the second bus bar 130 is still covered by the insulating sheet 140, the first groove 140a is in the second direction. The width W2 in the direction E2 needs to be at least greater than the distance D33 between the short portions 130a of the two second bus bars 130 plus the width W11 of the two short portions 130a. The width W2 within the above-mentioned range can ensure that the insulating sheet 140 will not cover the short portion 130b of the second bus bar 130, so that the short portion 130b of the second bus bar 130 can pass through the connection opening 102 to be connected to a connection box 170. The bypass diode 160 is connected. In an embodiment, the width W2 of the first groove 140a in the second direction E2 is 25 mm to 35 mm.

In another embodiment, the insulating sheet 140 may further include two second grooves 140b facing the first battery area 10a. The two second grooves 140b are located at the corners of the insulating sheet 140, for example. The reason for the formation of the two second grooves 140b is similar to that of the first groove 140a. The corners of the insulating sheet 140 may cover the light-receiving surface 110a of the half-cut solar cell 112 or be located on the backlight surface 110b of the half-cut solar cell 112. The welding wire 150 touches and damages it. In order to avoid the above-mentioned problems, the corners of the insulating sheet 140 need to be specially designed. In this embodiment, the second groove 140b may be formed at the corner of the insulating sheet 140 facing the first battery region 10a. The cross section of the second groove 140b is, for example, a triangle or a rectangle. In the following, a case where the cross-sections of the second groove 140b are triangular and rectangular will be introduced.

In one embodiment, the cross section of the second groove 140b is triangular. The width W3 of the second groove 140b in the first direction E1 is between the width W22 of the half-cut solar cell 112 in the first cell area 10a covered by the insulating sheet 140 in the first direction E1 and the second bus bar 130 to the width W22 in the first direction E1 A distance D44 between one side 140S1 of the insulating sheet 140 of the battery area 10a. Briefly, W22<W3<D44. In order to prevent the corners of the insulating sheet 140 from covering the light-receiving surface of the half-cut solar cell 112, the width W3 of the second groove 140b in the first direction E1 must be at least greater than the width of the insulating sheet 140 covering the half-cut solar cell 112 in the first direction E1 W22. However, if the width W3 of the second groove 140b in the first direction E1 is too large, part of the long portion 130a of the second bus bar 130 will be exposed and contact with the long portion 120a of the first bus bar 120. Short circuit. In order to avoid the above problems, the width W3 of the second groove 140b in the first direction E1 needs to be smaller than the distance D44 between the second bus bar 130 and the side 140S1 of the insulating sheet 140 in the first battery area 10a to The long portion 130a of the second bus bar 130 is prevented from being exposed. The width W3 within the above range can ensure that the insulating sheet 140 will not cover the light-receiving surface of the half-cut solar cell 112 and can avoid the problem of short circuit between the first bus bar 120 and the second bus bar 130. In an embodiment, the width W3 of the second groove 140b in the first direction E1 is 2 mm-7 mm.

The width W4 of the second groove 140b in the second direction E2 is smaller than the distance D55 from the second bus bar 130 to the side 140S2 of the insulating sheet 140 in the second direction E2. In short, W4<D55. In an embodiment, the side 140S2 of the insulating sheet 140 is connected to the side 140S1 of the insulating sheet 140, and the extending direction of the side 140S2 of the insulating sheet 140 is, for example, orthogonal to the extending direction of the side 140S1 of the insulating sheet 140. If the width W4 of the second groove 140b in the second direction E2 is too large, part of the long portion 130a of the second bus bar 130 will be exposed and contact the long portion 120a of the first bus bar 120, causing a short circuit. To avoid the above problems, the width W4 of the second groove 140b in the second direction E2 needs to be smaller than the distance D55 from the second bus bar 130 to the side 140S2 of the insulating sheet 140 in the second direction E2 to prevent the second The long portion 130a of the bus bar 130 is exposed. In addition, in order to prevent the corners of the insulating sheet 140 from covering the light-receiving surface of the half-cut solar cell 112, the width W4 of the second groove 140b in the second direction E2 must also be at least greater than a distance so that the corners of the insulating sheet 140 and the half-cut The solar cells 112 maintain the spacing. The width W4 within the above range can ensure that the insulating sheet 140 does not cover the light-receiving surface of the half-cut solar cell 112 and can avoid the problem of short circuit between the first bus bar 120 and the second bus bar 130. In an embodiment, the width W4 of the second groove 140b in the second direction E2 is 5 mm-10 mm.

In another embodiment, the cross section of the second groove 140b is rectangular. The width W5 of the second groove 140b in the first direction E1 is between the width W22 of the half-cut solar cell 112 in the first battery area 10a covered by the insulating sheet 140 in the first direction E1 and the bonding wire 150 to the first direction E1. Between E1 and the distance D11 from the edge of the half-cut solar cell 112. Briefly, W22<W5<D11. In order to prevent the corners of the insulating sheet 140 from covering the light-receiving surface of the half-cut solar cell 112, the width W5 of the second groove 140b in the first direction E1 must be at least greater than the width of the insulating sheet 140 covering the half-cut solar cell 112 in the first direction E1 W22. However, if the width W5 of the second groove 140b in the first direction E1 is too large, when the insulating sheet 140 is provided, part of the bonding wires 150 located on the backlight surface of the half-cut solar cell 112 will be contacted with the insulating sheet 140. damage. In order to avoid the above problems, the width W5 of the second groove 140b in the first direction E1 needs to be smaller than the distance D11 from the welding wire 150 in the first direction E1 to the edge of the half-cut solar cell 112 to prevent part of the solar cell from being located in the half-cut solar cell The bonding wire 150 on the backlight surface of 112 is in contact with the insulating sheet 140. The width W5 within the above range can ensure that the insulating sheet 140 will not cover the light-receiving surface 110a of the half-cut solar cell 112 and can avoid the problem of damage to the bonding wire 150. In an embodiment, the width W5 of the second groove 140b in the first direction E1 is 2 mm-4 mm. In addition, since the width W5 is within the above-mentioned range, the insulating sheet 140 of this embodiment has an alignment function. In detail, when the insulating sheet 140 is set, when the corner portion of the insulating sheet 140 with the second groove 140b is in contact with the edge of the half-cut solar cell 112, it can be determined that the insulating sheet 140 has been positioned in alignment, and the insulating sheet 140 The light-receiving surface 110a of the half-cut solar cell 112 does not cover, nor does it contact the bonding wire 150.

The width W6 of the second groove 140b in the second direction E2 is not particularly limited. However, to prevent the corners of the insulating sheet 140 from covering the light-receiving surface 110a of the half-cut solar cell 112, the width W6 of the second groove 140b in the second direction E2 must also be at least greater than a distance so that the corners of the insulating sheet 140 are The half-cut solar cells 112 maintain the spacing. In an embodiment, the width W6 of the second groove 140b in the second direction E2 is 20 mm-30 mm, but the present invention is not limited thereto.

In an embodiment, each of the multiple sets of bonding wires 150 connects a string of half-cut solar cells 112 and one of the two first bus bars 120 or the two second bus bars 130 in the first direction E1. In detail, the light-receiving surface 110a and the backlight surface 110b of each half-cut solar cell 112 are respectively provided with a set of bonding wires 150. One end of the group of bonding wires 150 is connected to the light-receiving surface 110a of one of the half-cut solar cells 112, and a set The other end of the bonding wire 150 is connected to the backlight surface 110b of the other half-cut solar cell 112 adjacent thereto. The above-mentioned set of welding wires 150 includes at least one welding wire for connecting half-cut solar cells 112 in series in the first direction E1 to form multiple strings of half-cut solar cells 112 arranged in the second direction E2. The material of the bonding wire 150 may be, for example, metal or other materials with conductive properties.

1B, 1C, 4A and 4B, in one embodiment, when the bonding wire 150 is located on the light-receiving surface 110a of the half-cut solar cell 112 covered by the short portion 130b of the second bus bar 130 and is in contact with the first When the two bus bars 130 are connected, the non-cut side 112S2 of a string of half-cut solar cells 112 faces the wiring area 10c in the first direction E1. Since the bonding wire 150 is connected to the second bus bar 130 (on the backlight surface 110b) on the light receiving surface 110a of the half-cut solar cell 112, the bonding wire 150 and the short portion 130b of the second bus bar 130 are connected A scissor effect is generated on the half-cut solar cell 112 sandwiched by the above two, so the non-cut side 112S2 of the uncut half-cut solar cell 112 needs to face the wiring area 10c to withstand the compressive stress generated by the above two, such as Shown in Figure 1B and Figure 4A. However, if the cut side 112S1 of the cut half-cut solar cell 112 faces the wiring area 10c, since the cut object tends to deform when subjected to external force, the cut side 112S1 of the cut half-cut solar cell 112 has lost its The original regular structure tends to change its shape more easily, so it is easily damaged by the scissors effect, as shown in Figure 4B.

In one embodiment, when the welding wire 150 is located on the backlight surface 110b of the half-cut solar cell 112 covered by the short portion 130b of the second bus bar 130 and is connected to the second bus bar 130, a string of half-cut solar cells 112 is cut The side 112S1 faces the wiring area 10c in the first direction E1. As shown in FIGS. 1C and 4A, since the bonding wire 150 is connected to the second bus bar 130 (located on the backlight surface 110b) on the backlight surface 110b of the half-cut solar cell 112, the bonding wire 150 is connected to The second bus bar 130 is located on the same plane without the aforementioned problem of the scissors effect.

In an embodiment, each of the plurality of bypass diodes 160 is connected between adjacent first bus bars 120 and second bus bars 130 or between two second bus bars 130. In detail, the bypass diode 160 is, for example, disposed between the short portion 120b of the adjacent first bus bar 120 and the short portion 130b of the second bus bar 130 or connected to the short portions of the two second bus bars 130. Between 130b. 1D, the multiple bypass diodes 160 of this embodiment can divide the half-cut solar cell 112 into multiple groups 112a, 112b, 112c, 112d, 112e, 112f, where the groups 112a, 112d share one side A circuit diode 160, the groups 112b and 112e share a bypass diode 160 and the groups 112c and 112f share a bypass diode 160. For example, when a single half-cut solar cell 112 in the group 112a is damaged and thus blocks the current flow path, the current can be bypassed in parallel with the group 112a where the damaged half-cut solar cell 112 is located. The diode 160 flows to the next group 112b. In this embodiment, multiple bypass diodes 160 are arranged in one junction box 170. Since the short portion 120b of the first bus bar 120 and the short portion 130b of the second bus bar 130 extend and concentrate in the region S, for example, along the first direction E1, a plurality of bypass diodes 160 are also arranged in the region S, Therefore, multiple bypass diodes 160 can be integrated into one junction box 170, thereby avoiding the need to provide multiple junction boxes, which may lead to process difficulties and reduce costs. In this embodiment, there are three bypass diodes 160. The bypass diode 160 may include a semiconductor material such as silicon.

In an embodiment, a junction box 170 is disposed on the other surface of the backplane 100, as shown in FIG. 2. The junction box 170 may, for example, include a structure for electrically connecting with external circuits, so as to export the power generated by the half-cut solar cell array 110 through the first bus bar 120 and the second bus bar 130.

In an embodiment, the half-cut solar cell module 10 may further include a plurality of third bus bars 180. The plurality of third bus bars 180 are, for example, located on the side of the first battery area 10a and the second battery area 10b away from the wiring area 10c. The half-cut solar cells located at the end of a string of half-cut solar cells 112 can be electrically connected to the third bus bar 180 by bonding wires 150 to connect in series the half-cut solar cells 112 arranged along the first direction E1, so that the half-cut solar cell array 110 can be Form a loop, as shown in Figure 1D.

In summary, the half-cut solar cell module of the present invention concentrates on extending the first bus bar and the second bus bar to the central area of the backlight surface of the half-cut solar cell module, so that a plurality of sides can be arranged in between. The circuit diode is integrated into a junction box to avoid process difficulties and reduce costs. In addition, in the present invention, a specially designed insulating sheet is arranged between the first bus bar and the second bus bar, so that the first bus bar and the second bus bar can be partially overlapped to reduce the use of wiring space, and have special features. The designed insulating sheet can prevent the insulating sheet from covering the light-receiving surface of the half-cut solar cell, so as to reduce the power loss caused by shading. The present invention also connects the non-cut side of a string of half-cut solar cells on the light-receiving surface of the half-cut solar cell covered by the short part of the second bus bar and the second bus bar on the backlight surface. Face the wiring area in the first direction to avoid the scissor effect.

Although the present invention has been disclosed as above by the embodiments, it is not intended to limit the present invention. Any person with ordinary knowledge in the technical field can make some changes and modifications without departing from the spirit and scope of the present invention. The scope of protection of the present invention shall be subject to the scope defined in the appended patent application.

10: Half-cut solar cell module 10a: First battery area 10b: Second battery area 10c: Wiring area 100: Backplane 102, 142: Outlet 110: Half-cut solar cell array 110a: Light receiving surface 110b: Backlight surface 112: Half-cut solar cell 112S1: cut side 112S2: non-cut side 112a, 112b, 112c, 112d, 112e, 112f: group 120: first bus bar 130: second bus bar 140: insulating sheet 140a: first groove 140b: The second groove 140S1, 140S2: side 150: welding wire 160: bypass diode 170: junction box 180: third bus bar A-A', B-B': section lines D11, D22, D33, D44 , D55: distance E1: first direction E2: second direction R, S: area W1, W2, W3, W4, W5, W6, W11, W22: width

FIG. 1A is a schematic top view of a backlight surface of a half-cut solar cell module according to an embodiment of the present invention. Fig. 1B is a schematic cross-sectional view according to the section line A-A' in Fig. 1A. Fig. 1C is a schematic cross-sectional view according to the section line B-B' in Fig. 1A. FIG. 1D is a circuit layout diagram of a backlight surface of a half-cut solar cell module according to an embodiment of the present invention. Fig. 2 is a schematic top view of a back sheet of a half-cut solar cell module according to an embodiment of the present invention. FIG. 3A is an enlarged schematic diagram according to an embodiment of the region R in FIG. 1A. FIG. 3B is an enlarged schematic diagram of another embodiment according to the region R in FIG. 1A. 4A is a photograph of the relative arrangement relationship of the half-cut solar cell, the welding wire and the second bus bar according to an embodiment of the present invention. FIG. 4B is a photograph of a half-cut solar cell damaged by the scissors effect.

10: Half-cut solar cell module

10a: The first battery area

10b: Second battery area

10c: Wiring area

110: Half-cut solar array

112: Half-cut solar cell

112S1: cutting side

112S2: non-cutting side

120: The first bus bar

130: second bus bar

140: Insulation sheet

180: third bus bar

A-A’, B-B’: cut line

E1: First direction

E2: second direction

R: area

Claims (12)

A half-cut solar cell module has a light-receiving surface and a backlight surface opposite to the light-receiving surface, and includes a first battery area, a second battery area, and a first battery area arranged in a first direction. The wiring area between the second battery area includes: a half-cut solar cell array located in the first battery area and the second battery area, including a plurality of strings of half-cut solar cells arranged in a second direction, the half-cut solar cell array The solar cell includes a cut side and a non-cut side opposite to the cut side in the first direction, wherein the second direction is orthogonal to the first direction; two first bus bars and two second The bus bar is located on the backlight surface and in the wiring area, the two first bus bars and the two second bus bars each include a long portion and a short portion, wherein all of the first bus bar The long portion partially overlaps the long portion of the second bus bar; an insulating sheet is disposed between the first bus bar and the second bus bar, and includes two first outlets, wherein Each of the two second bus bars extends from one surface of the insulating sheet to the other surface of the insulating sheet through the two first outlets; multiple sets of welding wires, wherein the multiple sets of welding Each of the lines connects a string of half-cut solar cells and one of the two first bus bars or the two second bus bars in the first direction; multiple bypass diodes, Wherein each bypass diode is connected between the adjacent first and second bus bars or between the two second bus bars; and a junction box, the plurality of The bypass diode is arranged in the one junction box. The half-cut solar cell module according to claim 1, wherein the insulating sheet includes a first groove facing the first battery area, and the first groove is located at the two first outlet lines Between the openings, wherein the width of the first groove in the first direction is between the distance from the welding line in the first direction to the edge of the half-cut solar cell and the welding line in the Between the distance from the first direction to the first bus bar, the width of the first groove in the second direction is greater than the width of the short portions of the two second bus bars plus The distance between the short portions of the two second bus bars. In the half-cut solar cell module described in item 2 of the scope of patent application, the cross section of the first groove is rectangular. The half-cut solar cell module according to the second item of the scope of patent application, wherein the insulating sheet further includes two second grooves facing the first battery area, and the two second grooves are located in the insulating At the corners of the sheet, wherein the width of the second groove in the first direction is between that of the half-cut solar cell located in the first battery area and covered by the insulating sheet in the first direction Between the width and the distance from the second bus bar to one side of the insulating sheet located in the first battery area, and the width of the second groove in the second direction is smaller than that of the second The distance between the bus bar and one side of the insulating sheet in the second direction. According to the half-cut solar cell module described in item 4 of the scope of patent application, the cross section of the second groove is triangular. The half-cut solar cell module according to the second item of the scope of patent application, wherein the insulating sheet further includes two second grooves facing the first battery area, and the two second grooves are located in the insulating At the corners of the sheet, wherein the width of the second groove in the first direction is between that of the half-cut solar cell located in the first battery area and covered by the insulating sheet in the first direction The width and the distance from the welding line to the edge of the half-cut solar cell in the first direction. According to the half-cut solar cell module described in item 6 of the scope of patent application, the cross section of the second groove is rectangular. The half-cut solar cell module described in claim 1, wherein, when the welding wire is located on the light-receiving surface of the half-cut solar cell covered by the short portion of the second bus bar and When connected to the second bus bar, the non-cut side of a string of half-cut solar cells faces the wiring area in the first direction, and when the bonding wire is located on the side of the second bus bar When the short part covers the backlight surface of the half-cut solar cell and is connected to the second bus bar, the cut side of a string of the half-cut solar cells faces the first direction Wiring area. The half-cut solar cell module described in the scope of patent application 1, wherein the long portions included in each of the two first bus bars and the two second bus bars extend along the second direction, so The short portions included in each of the two first bus bars and the two second bus bars extend along the first direction, and the ends of the long portions are connected to the ends of the short portions. The half-cut solar cell module described in item 1 of the scope of patent application further includes a back plate, the back plate includes a second outlet, the two first bus bars and the two second bus bars Each of the short portions extends from one surface of the back plate to the other surface of the back plate through the second outlet port so as to be the same as the one located on the other surface of the back plate The multiple bypass diodes in one junction box are connected. The half-cut solar cell module described in item 1 of the scope of patent application further includes a plurality of third bus bars, and the plurality of third bus bars are located far away from the first battery area and the second battery area. Said one side of the wiring area. The half-cut solar cell module described in item 11 of the scope of patent application, wherein each of the plurality of sets of bonding wires connects a string of half-cut solar cells and the plurality of third bus bars in the first direction One of them.

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