TWI527251B - Solar cell and module comprising the same - Google Patents

Description

Solar cell and its module

The invention relates to a solar cell and a module thereof, in particular to a twin solar cell and a module thereof.

Referring to Figures 1 and 2, a known solar cell includes a battery body 91, and a front electrode 92 and a back electrode 93 on the battery body 91. The battery body 91 includes a substrate 91 having a light receiving surface 911 and a back surface 912, an emitter layer 913 at the light receiving surface 911 of the substrate 91, and an anti-reflection layer 914 on the emitter layer 913. The substrate 91 and the emitter layer 913 form a p-n junction through a semiconductor process technology, which is a source of photovoltaic effects. The anti-reflective layer 914 is used to reduce the loss of incident light to increase the current. The front electrode 92 includes at least one elongated bus bar electrode 921 and a plurality of finger electrodes 922 laterally connected to the bus electrode 921. The bus electrode 921 and the plurality of finger electrodes 922 are manufactured by applying a conductive paste to the light receiving surface 911 of the battery body 91 by screen printing, and are solidified by a sintering process.

However, as the price of conductive paste continues to increase, especially the silver paste with better conductivity is expensive, and the bus electrode 921 of the conventional battery is added. The continuous strip shape has a large consumption of the conductive paste, which results in a high production cost of the battery. Therefore, how to improve the structure of the bus electrode 921 to save cost is an important issue. On the other hand, after the battery is manufactured, it is necessary to additionally solder a ribbon to the bus electrode 921 to arrange a plurality of cells in series to form a battery module. Therefore, in the improvement of the structure of the bus electrode 921, it is also necessary to consider whether the welding bonding force between the bus electrode 921 and the wire of the tape is sufficient. If the bonding force is not good, it is easy to generate when the module is packaged or used in subsequent use. The problem of the wire strip falling off, which in turn affects product reliability.

Accordingly, it is an object of the present invention to provide a solar cell and a module thereof which are capable of saving production costs and having good reliability.

Therefore, the solar cell of the present invention comprises: a substrate having a first light receiving surface, a plurality of first electrode groups, and a plurality of second electrode groups. The plurality of first electrode groups are disposed on the first light receiving surface and are arranged along a first direction. Each of the first electrode groups has a first confluence portion, and at least one is connected to the first confluence portion and along the first a first finger electrode portion extending in two directions. The first busbar has a first reflecting surface defining a first opening. The plurality of second electrode groups are disposed on the first light receiving surface and are spaced apart along the first direction, and the plurality of second electrode groups are spaced apart from the plurality of first electrode groups along the second direction. Each of the second electrode groups has a second bus bar and at least one second finger electrode portion connected to the second bus bar and extending in the second direction. The second bussing portion has a second reflecting surface defining a second opening, and the plurality of second openings face the plurality of first openings And staggered along the first direction.

The solar cell module of the present invention comprises: a first plate and a second plate disposed opposite to each other, and a plurality of solar cells and a plurality of ribbon wires arranged between the first plate and the second plate and as described above, And a packaging material. The plurality of ribbon strips are respectively connected to the plurality of solar cells, and each of the strip conductors covers the plurality of first confluences and the plurality of second confluences of the solar cell connected thereto. The encapsulant is located between the first plate and the second plate and is wrapped around the plurality of solar cells.

The effect of the invention: by replacing the known integrated strip-shaped and integrally solid-shaped bus electrodes by the plurality of spaced first and second busses, the amount of conductive paste can be reduced to reduce the production cost. At the same time, it can also meet the needs of welding stability, so that the product has good reliability. Moreover, the plurality of first reflective surfaces and the plurality of second reflective surfaces can reflect light to the inside of the battery for reuse, thereby improving light utilization efficiency, photocurrent, and photoelectric conversion efficiency.

1‧‧‧ first plate

2‧‧‧Second plate

3‧‧‧Solar battery

31‧‧‧Substrate

311‧‧‧The first light-receiving surface

312‧‧‧ back

313‧‧ ‧ emitter layer

314‧‧‧Second light-receiving surface

32‧‧‧ front electrode

320‧‧‧Front electrode unit

33‧‧‧ Back electrode

330‧‧‧Back electrode unit

34‧‧‧First electrode group

341‧‧‧ First Confluence Department

342‧‧‧First finger electrode

343‧‧‧First reflecting surface

344‧‧‧ first opening

345‧‧‧First reflection segment

346‧‧‧First extension

347‧‧‧ first junction

35‧‧‧Second electrode group

351‧‧‧Second Confluence Department

352‧‧‧Second finger electrode

353‧‧‧Second reflective surface

354‧‧‧ second opening

355‧‧‧second reflection section

356‧‧‧Second extension

357‧‧‧Second junction

36‧‧‧First auxiliary electrode

361‧‧‧First connecting electrode

362‧‧‧First extended electrode

363‧‧‧First auxiliary reflective surface

37‧‧‧Second auxiliary electrode

371‧‧‧Second connection electrode

372‧‧‧Second extension electrode

373‧‧‧Second auxiliary reflecting surface

38‧‧‧ third electrode group

381‧‧‧ Third Confluence Department

382‧‧‧ Third finger electrode

383‧‧‧ third reflecting surface

384‧‧‧ third opening

39‧‧‧fourth electrode group

391‧‧‧ Fourth Confluence Department

392‧‧‧Four finger electrode

393‧‧‧fourth reflecting surface

394‧‧‧fourth opening

4‧‧‧welding wire

5‧‧‧Package

61‧‧‧First direction

62‧‧‧second direction

A‧‧‧ imaginary line

Other features and effects of the present invention will be apparent from the following description of the drawings. FIG. 1 is a front view of a known solar cell; FIG. 2 is a cross-sectional view taken along line AA of FIG. 3 is a partial cross-sectional view showing a first preferred embodiment of the solar cell module of the present invention; and FIG. 4 is a front elevational view of a solar cell of the first preferred embodiment; Figure 5 is a partial enlarged view of Figure 4, the arrows indicate the light reflecting path; Figure 6 is a partial perspective view of the solar cell of the first preferred embodiment, the arrows indicate the light reflecting path; Figure 7 is the solar cell of the present invention A front partial view of a solar cell of a second preferred embodiment of the module; FIG. 8 is a front partial view of a solar cell of a third preferred embodiment of the solar cell module of the present invention; A front view of a solar cell of a fourth preferred embodiment of the solar cell module; FIG. 10 is a front partial view of a solar cell of a fifth preferred embodiment of the solar cell module of the present invention; A front partial view of a solar cell of a sixth preferred embodiment of the invention, wherein the arrows indicate a light reflecting path; and FIG. 12 is a seventh preferred embodiment of the solar cell module of the present invention. A schematic view of the back of a solar cell.

Before the present invention is described in detail, it should be noted that in the following description, similar elements are denoted by the same reference numerals.

Referring to FIGS. 3 and 4, a first preferred embodiment of the solar cell module of the present invention comprises: a first plate 1 and a second plate 2 disposed opposite each other, and a plurality of arrays arranged on the first plate 1 and a solar cell 3 between the second plate 2, and a plurality of ribbon wires 4 connecting the solar cells 3, And at least one encapsulating material 5 between the first plate member 1 and the second plate member 2 and surrounding the plurality of solar cells 3.

The first plate 1 and the second plate 2 are not particularly limited in implementation, and a glass or plastic plate may be used, and the plate on one side of the light receiving surface of the battery must be permeable to light. The material of the encapsulant 5 is, for example, a translucent ethylene vinyl acetate copolymer (EVA). Of course, other materials suitable for packaging may be used.

The plurality of solar cells 3 are electrically connected through the plurality of ribbon conductors 4. The structures of the plurality of solar cells 3 are the same, and only one of them will be described below as an example. However, it is absolutely necessary that the individual batteries in a module are not identical in structure.

Referring to FIGS. 4, 5, and 6, the solar cell 3 includes a substrate 31, a front electrode 32, and a back electrode 33.

The substrate 31 has an opposite first light receiving surface 311 and a back surface 312. An emitter layer 313 is disposed on the inner side of the first light receiving surface 311. The emitter layer 313 can be provided with an anti-illustration. Reflective layer. The substrate 31 is, for example, a germanium substrate, and one of the substrate 31 and the emitter layer 313 is an n-type semiconductor, and the other is a p-type semiconductor, thereby forming a pn junction. The material of the anti-reflection layer, for example, silicon nitride (SiN _x), can be used to reduce the light reflection to increase the amount of light. Since the structure of the substrate 31 is not an improvement of the present invention, it will not be described.

The front surface electrode 32 is disposed on the first light receiving surface 311 of the substrate 31 and includes two front and rear electrode units 320 disposed on the left and right sides. The boundary between the two front electrode units 320 is as shown by the imaginary line A of FIG. 4 . Every front The electrode unit 320 includes a plurality of first electrode groups 34 and a plurality of second electrode groups 35.

The first electrode groups 34 of each of the front electrode units 320 are disposed on the first light receiving surface 311 and are spaced apart along a first direction 61. Each of the first electrode groups 34 has a first current collecting portion 341. And a first finger electrode portion 342 connected to the first bussing portion 341 and extending along a second direction 62 perpendicular to the first direction 61. The first bussing portion 341 has a first reflecting surface 343 defining a first opening 344, and the first reflecting surface 343 has at least one first reflecting portion 345 having a slope. When light is incident on any of the first reflecting surfaces 343, the first reflecting surface 343 can be used to reflect light, so that the light has a chance to return to the inside of the battery (Fig. 5, 6 indicates the light reflecting path).

Specifically, each of the first reflective surfaces 343 of the embodiment has two first extensions 346 that are opposite to each other and are parallel to the second direction 62, and two firsts that respectively connect the two first extensions 346. The reflection section 345 is not parallel to the first direction 61 and the second direction 62, and is further designed as a slope, and one ends of the two first reflection sections 345 are connected. The two first extensions 346 and the two first reflection segments 345 together define the first opening 344.

The plurality of second electrode groups 35 of each of the front electrode units 320 are disposed on the first light receiving surface 311 and spaced apart along the first direction 61, and the plurality of second electrode groups 35 and the first plurality The electrode groups 34 are spaced apart along the second direction 62, and each of the second electrode groups 35 is interleaved rather than completely corresponding to the position of each of the first electrode groups 34. Each second electrode group 35 There is a second bus bar 351 and a second finger electrode portion 352 connected to the second bus bar 351 and extending along the second direction 62. Each of the second finger electrode portions 352 extends from each of the second bus bar portions 351 in a direction opposite to the plurality of first finger electrode portions 342, and the plurality of second finger electrode portions 352 and the plurality of Since the positions of the first finger electrode portions 342 do not correspond, the plurality of second finger electrode portions 352 and the plurality of first finger electrode portions 342 are located on different straight lines extending along the second direction 62.

The second bussing portion 351 has a second reflecting surface 353 defining a second opening 354, and the second reflecting surface 353 has at least one second reflecting portion 355 having a slope. The plurality of second openings 354 face the plurality of first openings 344 and are staggered along the first direction 61. The function of the second reflective surface 353 is the same as that of the first reflective surface 343. When light is incident on any of the second reflective surfaces 353, the second reflective surface 353 can be used to reflect light, so that the light has a chance to return. Use inside the battery.

Specifically, each second reflective surface 353 of the embodiment has two second extensions 356 spaced apart from each other and parallel to the second direction 62, and two second connecting the two second extensions 356, respectively. The two reflective segments 355 are not parallel to the first direction 61 and the second direction 62, and are designed to be inclined, and one ends of the two second reflective segments 355 are connected. The two second extensions 356 and the two second reflection segments 355 together define the second opening 354.

It is to be noted that the two front electrode units 320 of the front electrode 32 of the embodiment are connected, and the plurality of first finger electrodes 342 of one of the front electrode units 320 are connected to the other front side. The plurality of second finger electrode portions 352 of the pole unit 320. However, in the implementation of the present invention, it is not necessary to use the two front electrode units 320 as an absolute necessity, and only one front electrode unit 320 may be provided. The plurality of strip conductors 4 of the embodiment are respectively soldered corresponding to the two front electrode units 320 of each solar cell 3, and each of the strip conductors 4 covers the plurality of the front electrode units 320 connected thereto. A confluence portion 341 and the plurality of second confluence portions 351. The two strip conductors 4 on each solar cell 3 are connected to the back electrode 33 of the adjacent other solar cell 3, thereby bonding the cells in series.

The back electrode 33 is located on the back surface 312 of the substrate 31 and is used for outputting electric energy in cooperation with the front electrode 32. However, since the back electrode 33 is not a modification of the embodiment, it will not be described.

The present invention is provided with each of the plurality of spaced first confluence portions 341 and second confluence portions 351 by each of the front electrode units 320, instead of the known integrated strip-shaped and integrally solid-structured bus electrodes, The confluent portion 341 and the second confluent portion 351 are spaced apart from each other and partially hollowed out, thereby reducing the amount of conductive paste of the electrode, and reducing the slurry consumption by at least 50%, thereby effectively reducing the production cost. Further, the plurality of first bus bars 341 are alternately arranged with the plurality of second bus bars 351 to help provide sufficient solder bonding force, thereby enabling the solder ribbon wires 4 to be firmly soldered and attached. In this way, the invention can reduce the production cost, and can also meet the requirements of the welding stability, so that the welded module can pass the subsequent tensile test, so that the product has good reliability.

On the other hand, the present invention sets the plurality of first openings 344 to form the plurality of first reflective surfaces 343, and sets the plurality of second openings. The mouth 354 is formed to form the plurality of second reflecting surfaces 353, and the light can be reflected to the inside of the battery for reuse, thereby improving the light utilization rate and improving the photocurrent and the photoelectric conversion efficiency. Therefore, the invention can improve the battery efficiency while reducing the production cost, and is very helpful for the utilization of the solar cell industry.

Referring to FIG. 7, the structure of the second preferred embodiment of the solar cell module of the present invention is substantially the same as that of the first preferred embodiment, except that the first reflection of each first confluence portion 341 of the present embodiment is The two first reflective segments 345 of the face 343 are not directly connected, and each of the first reflective faces 343 further has a first connection extending along the first direction 61 and connected between the two first reflective segments 345. Paragraph 347. Similarly, the second reflecting surface 353 of each second bussing portion 351 further has a second engaging portion 357 extending along the first direction 61 and connected between the two second reflecting segments 355.

This embodiment also achieves the same effects as the first preferred embodiment by the design of the front electrode 32, and will not be described here.

Referring to FIG. 8, the structure of the third preferred embodiment of the solar cell module of the present invention is substantially the same as that of the first preferred embodiment, except that the first reflection of each first confluence portion 341 of the embodiment is The face 343 has at least one curved first reflective segment 345, and the second reflective face 353 of each second merged portion 351 has at least one curved second reflective segment 355. Specifically, the first reflective surface 343 of the embodiment has two opposite first extensions 346, and two first reflective segments 345 that are respectively connected to the two first extensions 346 and have a curved surface. The structure of the second reflecting surface 353 of this embodiment is similar to that of the first reflecting surface 343, and thus has two opposite second An extension 356 and two second reflective segments 355 that are curved.

Referring to FIG. 9, the structure of the fourth preferred embodiment of the solar cell module of the present invention is substantially the same as that of the first preferred embodiment. The difference is that the first finger in each front electrode unit 320 of the present embodiment The electrode portion 342 corresponds to the extended position of the second finger electrode portion 352, so each of the first finger electrode portion 342 and one of the plurality of second finger electrode portions 352 is a second finger electrode portion 352 Located on the same line extending along the second direction 62.

Referring to FIG. 10, the structure of the fifth preferred embodiment of the solar cell module of the present invention is substantially the same as that of the first preferred embodiment, except that each of the first electrode groups 34 has a plurality of connections to the first confluence. The first finger electrode portion 342 extending along the second direction 62 and the plurality of first finger electrode portions 342 are spaced apart along the first direction 61. Similarly, each second electrode group 35 has a plurality of second finger electrode portions 352 connected to the second bus bar portion 351 and extending along the second direction 62. The plurality of second finger electrode portions 352 are along the first One direction 61 is arranged at intervals.

Referring to FIG. 11, the structure of the sixth preferred embodiment of the solar cell module of the present invention is substantially the same as that of the first preferred embodiment, except that each of the first electrode groups 34 has a plurality of first finger electrodes. The portion 342 has a plurality of second finger electrodes 352 for each of the second electrode groups 35. The adjacent first electrode groups 34 are connected via a first auxiliary electrode 36, and the adjacent two second electrode groups 35 are connected via a second auxiliary electrode 37.

The first auxiliary electrode 36 includes a first connection electrode connecting the adjacent first finger electrode portions 342 of the adjacent two first electrode groups 34. a pole 361, and a first extension electrode 362 connected to the first connection electrode 361 and extending along the second direction 62, the first connection electrode 361 including at least one first auxiliary reflection in a direction toward the second electrode group 35 Face 363.

The second auxiliary electrode 37 includes a second connection electrode 371 connecting the adjacent second finger electrode portions 352 of the adjacent two second electrode groups 35, and a second connection electrode 371 connected to the second direction 62 extends the second extension electrode 372. The second connection electrode 371 includes at least one second auxiliary reflection surface 373 facing the direction of the first electrode group 34.

Specifically, the first auxiliary electrode 36 and the second auxiliary electrode 37 of the embodiment are both similar to the Y shape, but are not limited thereto, and the number of the first auxiliary reflection surfaces 363 of each of the first auxiliary electrodes 36 is two. The number of the second auxiliary reflecting surfaces 373 of each of the second auxiliary electrodes 37 is also two, but in practice, only one first auxiliary reflecting surface 363 and one second auxiliary reflecting surface 373 may be provided. The first auxiliary reflecting surface 363 and the second auxiliary reflecting surface 373 are both inclined surfaces and are not parallel to the first direction 61 and the second direction 62. The functions of the first auxiliary reflective surface 363 and the second auxiliary reflective surface 373 are similar to those of the first reflective surface 343 and the second reflective surface 353, and can be used to reflect light to improve the utilization of light, thereby improving photocurrent and photoelectric conversion. effectiveness.

It should be noted that the first auxiliary reflecting surface 363 and the second auxiliary reflecting surface 373 are not limited in shape, and may be a straight plane extending along the first direction 61 as long as the light can be reflected inside the battery. Improve light utilization. Similarly, the form of the first reflecting surface 343 and the second reflecting surface 353 is not limited.

The batteries of the above embodiments are all single-sided light-receiving cells, but the electrode structure of the present invention can also be applied to a double-sided solar cell, which will be described below by way of the following examples.

Referring to Figures 4 and 12, the seventh preferred embodiment of the solar cell module of the present invention is substantially the same as the structure of the first preferred embodiment. The following mainly describes different places. The solar cell 3 of the present embodiment is a double-sided light-receiving battery, so that both the front and the back of the substrate 31 can receive light. The substrate 31 has one and the first in addition to the first light-receiving surface 311 (FIG. 4). The second light receiving surface 314 opposite to the light receiving surface 311 (FIG. 12). An electric field layer and an anti-reflection layer, not shown, may be disposed at the second light receiving surface 314. The electric field layer has the same conductivity as the substrate 31, and the carrier concentration of the electric field layer is larger than the carrier concentration of the substrate 31, and its function is to improve the carrier collection efficiency.

The back electrode 33 of the present embodiment is disposed on the second light receiving surface 314. The back electrode 33 has the same structure as the front surface electrode 32. The back electrode 33 has two left and right rear electrode units 330, each of the back electrode units. 330 has a plurality of third electrode sets 38 and a plurality of fourth electrode sets 39. The plurality of third electrode groups 38 in each of the back electrode units 330 are spaced apart along the first direction 61. Each of the third electrode groups 38 has a third confluence portion 381, and at least one is connected to the third confluence portion 381. And a third finger electrode portion 382 extending along the second direction 62, the third bus bar portion 381 having a third reflecting surface 383 defining a third opening 384.

The plurality of fourth electrode groups 39 in each of the back electrode units 330 are spaced apart along the first direction 61, and the plurality of fourth electrode groups 39 are spaced apart from the plurality of third electrode groups 38 along the second direction 62. Arrange, every fourth The positions of the electrode group 39 and each of the third electrode groups 38 are staggered rather than completely corresponding. Each of the fourth electrode groups 39 has a fourth confluent portion 391 and at least one fourth finger electrode portion 392 connected to the fourth confluence portion 391 and extending along the second direction 62. The fourth confluence portion 391 has a A fourth reflective surface 393 defining a fourth opening 394 is formed that faces the plurality of third openings 384 and is staggered along the first direction 61.

The embodiment is applied to the double-sided light-receiving solar cell 3, and the same can be achieved for reducing production cost, providing good product reliability, and improving photocurrent and photoelectric conversion efficiency.

It should be noted that the structure of the front electrode 32 of each of the foregoing embodiments can also be applied to the structure of the back electrode 33 of the double-sided light-receiving solar cell 3, and the structure of the front electrode 32 and the back electrode 33 in a double-sided battery. Not necessarily the same, it can be a plurality of different combinations of the various electrode structures of the above embodiments.

The above is only the preferred embodiment of the present invention, and the scope of the present invention is not limited thereto, that is, the simple equivalent changes and modifications made by the patent application scope and patent specification content of the present invention, All remain within the scope of the invention patent.

3‧‧‧Solar battery

31‧‧‧Substrate

311‧‧‧The first light-receiving surface

32‧‧‧ front electrode

320‧‧‧Front electrode unit

34‧‧‧First electrode group

341‧‧‧ First Confluence Department

342‧‧‧First finger electrode

343‧‧‧First reflecting surface

344‧‧‧ first opening

345‧‧‧First reflection segment

346‧‧‧First extension

35‧‧‧Second electrode group

351‧‧‧Second Confluence Department

352‧‧‧Second finger electrode

353‧‧‧Second reflective surface

354‧‧‧ second opening

355‧‧‧second reflection section

356‧‧‧Second extension

61‧‧‧First direction

62‧‧‧second direction

Claims (11)

A solar cell comprising: a substrate having a first light receiving surface: a plurality of first electrode groups disposed on the first light receiving surface and spaced apart along a first direction, each first electrode group having a first And a first finger electrode portion connecting the first bus bar portion and extending along a second direction, the first bus bar portion having a first reflecting surface defining a first opening; and a plurality of a second electrode group disposed on the first light receiving surface and spaced apart along the first direction, and the plurality of second electrode groups and the plurality of first electrode groups are arranged along the second direction, each second electrode The group has a second bussing portion, and at least one second finger electrode portion connecting the second bus bar portion and extending along the second direction, the second bus bar portion having a second reflecting surface defining a second opening The plurality of second openings are opposite to the plurality of first openings and staggered along the first direction. The solar cell of claim 1, wherein the first reflecting surface of each of the first confluent portions has at least one beveled first reflecting segment, and the second reflecting surface of each of the second confluent portions has at least one beveled surface The second reflection segment. The solar cell of claim 1, wherein the first reflecting surface of each first confluent portion has at least one first reflecting segment having a curved surface, and the second reflecting surface of each second confluent portion has at least one The second reflecting segment of the curved surface. The solar cell of claim 1, wherein the plurality of first finger electrodes and the plurality of second finger electrodes are located on different straight lines extending along the second direction. The solar cell of claim 1, wherein each of the first finger electrode portions and one of the plurality of second finger electrode portions are located in the same straight line extending in the second direction on-line. The solar cell of claim 1, wherein the adjacent two first electrode groups are connected via a first auxiliary electrode, and the adjacent two second electrode groups are connected via a second auxiliary electrode. The solar cell of claim 6, wherein the first auxiliary electrode comprises a first connection electrode connecting the adjacent first finger electrode portions of the adjacent two first electrode groups, and a first connection is connected And a second extension electrode extending along the second direction; the second auxiliary electrode includes a second connection electrode connecting the adjacent second finger electrode portions of the adjacent two second electrode groups, and a connection And a second extension electrode connecting the electrodes and extending in the second direction. The solar cell of claim 7, wherein the first connection electrode comprises a first auxiliary reflection surface facing the second electrode group, and the second connection electrode comprises a direction toward the first electrode group. The second auxiliary reflecting surface. The solar cell of claim 8, wherein the first auxiliary reflecting surface and the second auxiliary reflecting surface are inclined surfaces. The solar cell of claim 1, wherein the substrate further has a second light receiving surface opposite to the first light receiving surface, the solar cell further The method includes a plurality of third electrode groups disposed on the second light receiving surface and a plurality of fourth electrode groups, wherein the plurality of third electrode groups are arranged along the first direction, and each of the third electrode groups has a third current And a third finger electrode portion connecting the third bus bar and extending along the second direction, the third bus bar having a third reflecting surface defining a third opening; the plurality of fourth The electrode groups are arranged along the first direction, and the plurality of fourth electrode groups are spaced apart from the plurality of third electrode groups in the second direction, each fourth electrode group has a fourth confluence portion, and at least one a fourth finger electrode portion connecting the fourth bus bar portion and extending along the second direction, the fourth bus bar portion having a fourth reflecting surface defining a fourth opening, the plurality of fourth openings and the plurality of The third openings face and are staggered in the first direction. A solar cell module comprising: a first plate and a second plate disposed oppositely; and a plurality of solar cells according to any one of claims 1 to 10, arranged on the first plate and the second plate a plurality of ribbon strips respectively connected to the plurality of solar cells, and each of the strip conductors covers the plurality of first confluence portions and the plurality of second confluence portions of the solar cell connected thereto; and a package The material is located between the first plate and the second plate and is wrapped around the plurality of solar cells.