TWI528571B - Solar cell, solar cell set, solar cell module, and method of assembling the solar cell set - Google Patents

Description

Solar cell, solar cell, solar cell module And assembly method of solar battery pack

The invention relates to a solar cell, a solar cell group, a solar cell module and a solar cell assembly method, in particular to a back contact solar cell, a back contact solar cell, a back contact solar cell module and A method of assembling a back contact solar cell.

Referring to FIG. 1, a known Interdigitated Back Contact (IBC) solar cell 90 generally includes a substrate 91 that converts light energy into electrical energy, and is disposed on the back side 911 side of the substrate 91. A first electrode 92 and a second electrode 93, one of the first electrode 92 and the second electrode 93 being a positive electrode and the other being a negative electrode. The first electrode 92 includes a first confluence portion 921 and a plurality of first interdigitated portions 922 extending outward from the first confluence portion 921. The second electrode 93 includes a second confluence portion 931 opposite to the first confluence portion 921, and a plurality of second confluence portions 931 extending outwardly and staggered in the plurality of first interdigitated portions 922 A second interdigitated portion 932. The solar energy The battery 90 is characterized in that the first electrode 92 and the second electrode 93 are located on the back surface 911 side of the substrate 91. A front surface (not shown) of the substrate 91 is not provided with an electrode, so that the front side of the received light can be avoided. Occlusion, so the amount of light entering the front side can be increased.

The solar cells 90 described above are typically used in groups and electrically connected to each other to form a solar cell stack 9. Specifically, two adjacent solar cells 90 are connected through a plurality of ribbon wires 99, and each of the ribbon wires 99 connects the first confluence portion 921 of two adjacent solar cells 90 and two The second confluence portion 931 of the adjacent solar cell 90. After the first finger portion 922 and the second finger portion 932 of each solar cell 90 collect electrical energy, the electric energy is transmitted to the ribbon conductor 99 via the first confluence portion 921 and the second confluent portion 931, so that the electric energy can be directed to Exported for use.

Since the first electrode 92 and the second electrode 93 of each solar cell 90 are substantially filled with the back surface 911 of the substrate 91, a large amount of conductive paste is required to be fabricated to fabricate the first electrode 92 and the second electrode. 93. Since the material of the conductive paste is mainly silver (Ag), which is expensive, the cost of the aforementioned solar cell 90 is high. More importantly, since the welded portions of the two adjacent solar cells 90 and the ribbon conductor 99 are on both sides of the solar cell 90, since the side edges of the substrate 91 are relatively weak, if they are welded at the portion, they are easily broken. The service life of the solar cell 90 is lowered, and the battery is de-energized between the solar cell 90 and the ribbon wire 99 after the rupture, so that the electric energy of the remaining solar cells 90 in one solar cell group 9 cannot be exported, so the current collection effect is poor. .

Accordingly, it is an object of the present invention to provide a solar cell, a solar cell module, a solar cell module, and a solar cell assembly method which can reduce production cost and improve current collection effect and service life.

Therefore, the solar cell of the present invention comprises: a substrate of a second conductivity type, at least one first doped region of a first conductivity type, at least one second doped region of a second conductivity type, and a dielectric layer a plurality of first electrodes and a plurality of second electrodes.

The substrate includes a front side and a back side opposite to each other. The first doped region is located within the back surface, and the second doped region is located within the back surface. The dielectric layer is located on the back surface and has a plurality of first holes respectively corresponding to the first doped regions, and a plurality of second holes respectively corresponding to the second doped regions. Each of the first electrodes is located in each of the first holes and connected to the first doped region, and the plurality of first electrodes are not in contact with each other. Each of the second electrodes is located in each of the second holes and is connected to the second doped region, and the plurality of second electrodes are not in contact with each other.

The solar battery of the present invention comprises: a solar cell as described above, and an electrical transmission unit.

The electrical transmission unit is disposed on a back surface of the solar cell, and the electrical transmission unit includes a first metal layer and a second metal layer, and an insulating film covering the first metal layer and the second metal layer. The insulating film has a plurality of first openings respectively corresponding to a plurality of first electrodes, and a plurality of second openings respectively corresponding to a plurality of second electrodes. The The first metal layer is connected to the corresponding first electrode via each of the first openings, and the second metal layer is connected to the corresponding second electrode via each of the second openings.

The solar cell module of the present invention comprises: a first plate, a second plate, at least one solar cell set as described above and disposed between the first plate and the second plate, and a first plate and the first plate The second plate is in contact with the packaging material of the solar cell.

The method for assembling a solar cell of the present invention comprises: providing a plurality of solar cells, each solar cell having a plurality of first electrodes and a plurality of second electrodes having opposite polarities and on the same side; providing a plurality of electrical transmission units, each An electrical transmission unit includes a first metal layer and a second metal layer, and an insulating film covering the first metal layer and the second metal layer, each insulating film having a plurality of corresponding first electrodes respectively And a first opening for exposing the first metal layer, and a plurality of second openings respectively corresponding to each of the second electrodes and exposing the second metal layer, and the first metal layer and the second metal layer respectively have Extending to a first portion and a second portion at two opposite sides of the insulating film, at least one of the first portion and the second portion extending from a side of the solar cell Externally, the first opening and the second opening of each of the electrical transmission units are respectively aligned with the first electrode and the second electrode of each solar cell; and a heat source is provided to be exposed to each of the first openings and each of the second openings A first metal layer and second metal layer, respectively connected to the plurality of first electrodes and the plurality of second electrodes; and Connecting the above-mentioned electric transmission unit connected with the solar battery to another electric transmission unit connected with the solar battery, wherein any two adjacent electric transmission units are connected with the first part and the second part of each other .

The effect of the present invention is that since the first electrode and the second electrode of the solar cell of the present invention are respectively distributed in a dot shape and are accommodated in the first hole and the second hole of the dielectric layer, the conductive paste can be saved. The amount of production can reduce production costs. In addition, since the contact point between the electric transmission unit and the solar cell is also distributed in a dot shape, it has a better current collecting effect. More importantly, the first metal layer and the second metal layer can increase the structural strength of the electrical transmission unit, and can be used to support the solar cell to avoid fragmentation, thereby improving the service life of the solar battery.

1‧‧‧Solar battery pack

2‧‧‧Solar battery

21‧‧‧Substrate

211‧‧‧ positive

212‧‧‧Back

213‧‧‧First doped area

214‧‧‧Second doped area

215‧‧‧ interval zone

216‧‧‧ front surface electric field

22‧‧‧Dielectric layer

221‧‧‧ first hole

222‧‧‧ second hole

23‧‧‧Anti-reflective layer

241‧‧‧First electrode

242‧‧‧second electrode

3, 3'‧‧‧Electric transmission unit

31, 31'‧‧‧ first metal layer

310’‧‧‧ first hole

311, 311'‧‧‧ first part

32, 32'‧‧‧ second metal layer

320’‧‧‧Second hole

321,321'‧‧‧ Part II

322‧‧‧ parallel part

323‧‧‧Setting end

33, 33'‧‧‧Insulation film

331,331'‧‧‧ first opening

332, 332’ ‧ ‧ second opening

41, 41'‧‧‧ First Conductive Department

42. 42'‧‧‧Second Conductive Department

43‧‧‧ Third Conductive Department

44‧‧‧fourth conductive part

5‧‧‧Solar battery module

51‧‧‧ first plate

52‧‧‧Second plate

53‧‧‧Package

81‧‧‧First direction

82‧‧‧second direction

S01~S04‧‧‧Steps

Other features and effects of the present invention will be apparent from the following description of the drawings, wherein: FIG. 1 is a rear view showing a relationship between a known interdigitated back contact solar cell and a ribbon conductor. For ease of understanding, the back side of the solar cell is drawn upwards; FIG. 2 is a top plan view showing an electric transmission unit of one of the first preferred embodiments of the solar cell of the present invention; FIG. 3 is the first preferred embodiment. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 4 is a cross-sectional view of the solar cell of the first preferred embodiment, and is also for ease of understanding The back side of the solar cell is drawn upwards; 5 is a schematic view similar to FIG. 3, showing another aspect of the electrical transmission unit of the first preferred embodiment; FIG. 6 is a step flow block of a preferred embodiment of the solar battery assembly of the present invention. Figure 7 is a schematic flow chart showing a step of a preferred embodiment of the assembly method; Figure 8 is a partial cross-sectional view showing a first preferred embodiment of the solar cell module of the present invention; An electric transmission unit of a second preferred embodiment of the solar battery module of the present invention is shown; FIG. 10 is a cross-sectional exploded view of the second preferred embodiment, and the cross-sectional position in the figure is the BB line of FIG. And FIG. 11 is a side cross-sectional view taken along line CC of FIG. 9.

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 Figures 2, 3 and 4, a first preferred embodiment of the solar cell stack 1 of the present invention comprises: a solar cell 2, an electrical transmission unit 3, and a connection between the solar cell 2 and the electrical transmission unit 3. The plurality of first conductive portions 41 and the plurality of second conductive portions 42 and the plurality of third conductive portions 43 and the plurality of fourth conductive portions 44.

The solar cell 2 of the present embodiment is in the form of a back contact solar cell, and includes: a substrate 21 of a second conductivity type, a plurality of first doping regions 213 of a first conductivity type, and a plurality of second conductivity types. a second doped region 214, a plurality of spacers 215, and a front surface of the second conductivity type The electric field region 216, a dielectric layer 22, an anti-reflection layer 23, and a plurality of first electrodes 241 and a plurality of second electrodes 242 on the same side.

The substrate 21 of the present embodiment may be an n-type single crystal germanium substrate or a polycrystalline germanium substrate. The substrate 21 includes a front surface 211 and a back surface 212 opposite to each other. The front surface 211 can receive light and can have a concave-convex structure to increase the amount of light incident.

The first doping region 213 of the embodiment is located in the back surface 212. The first doping region 213 is partially formed into a heavy portion of the substrate 21 by a diffusion process (for example, boron diffusion) or other doping methods. Doped p ⁺ type semiconductor.

The second doping region 214 of the embodiment is located inside the back surface 212, and the plurality of second doping regions 214 are internally part of the substrate 21 by a diffusion process (for example, phosphorus diffusion) or other doping manner. A heavily doped n ⁺⁺ type semiconductor is formed and has a doping concentration greater than a doping concentration of the substrate 21.

The spacer 215 of the embodiment is located at the back surface 212 and between the plurality of first doping regions 213 and the plurality of second doping regions 214 for spacing the plurality of first doping regions 213 and The plurality of second doping regions 214 prevent leakage currents (Leakage Current) from parasitic shunting. In fact, when the plurality of first doped regions 213 and the plurality of second doped regions 214 are formed by a diffusion process, the plurality of first doped regions 213 and the plurality of cells may be controlled by appropriate process control. The two doped regions 214 are spaced apart from each other, and the plurality of first doped regions 213 and the plurality of second doped regions 214 are not additionally inserted. The area of the row diffusion process becomes the plurality of spacers 215. Of course, the plurality of spacers 215 can also be ablated by a laser process to form a well-concavely separated structure (not shown) to avoid the plurality of first doped regions 213 and the plurality of diffusion processes in the diffusion process. The boundary between the two doped regions 214 may leave doping impurities, thereby preventing leakage current.

The front surface electric field region 216 of the present embodiment is located within the front surface 211 and extends along the undulations of the front surface 211. The front surface electric field region 216 is an n ⁺ -type semiconductor, and its doping concentration is greater than the doping concentration of the substrate 21, thereby forming a front-side electric field (Front-Side Field, FSF for short) to improve carrier collection efficiency and photoelectric conversion efficiency. . In practice, a diffusion process (such as phosphorus diffusion) or a doping paste or the like may be utilized to make the doping concentration at the front surface 211 higher than the inside of the substrate 21, thereby forming an n ⁺ -type semiconductor.

The dielectric layer 22 of the present embodiment is located on the back surface 212 and covers the plurality of first doping regions 213, the plurality of second doping regions 214, and the plurality of spacer regions 215. The material of the dielectric layer 22 may be an oxide, a nitride or a combination of the above materials, and used to passivate and repair the surface of the substrate 21 to reduce the Dangling Bond and defects of the surface, thereby reducing carrier traps ( Trap) and reducing the Surface Recombination Velocity (SRV) of the carrier to improve the photoelectric conversion efficiency of the solar cell 2. The dielectric layer 22 has a plurality of first holes 221 corresponding to the plurality of first doping regions 213, and a plurality of second holes 222 corresponding to the plurality of second doping regions 214.

The anti-reflection layer 23 of the present embodiment is located on the front surface 211 and covers the front surface electric field region 216. The material thereof is, for example, tantalum nitride (SiN _x ), yttrium oxide, etc., and can be used to increase the amount of light incident and reduce the carrier. Surface recombination rate.

The first electrode 241 of the embodiment is located on the back surface 212. Each of the first electrodes 241 is located in each of the first holes 221 and is connected to the corresponding first doping region 213, and the plurality of first electrodes 241 are There is no contact between each other. The second electrode 242 of the embodiment is located on the back surface 212. Each of the second electrodes 242 is located in each of the second holes 222 and is connected to the corresponding second doping region 214, and the plurality of second electrodes 242 are There is no contact between each other. The plurality of first electrodes 241 and the plurality of second electrodes 242 are opposite in polarity to each other. In the embodiment, the plurality of first electrodes 241 are positive electrodes, and the plurality of second electrodes 242 are negative electrodes.

It should be noted that the first hole 221 and the second hole 222 of the embodiment are cylindrical recesses. However, in practice, the plurality of first holes 221 and the plurality of second holes 222 may also be long strips. A structure such as a linear groove or other shape is not limited to the example of the embodiment. In this embodiment, a portion of each of the first electrodes 241 is received in each of the first holes 221 to correspond to the shape of the first hole 221, and a portion of the first electrode 241 is protruded from the corresponding first hole. Outside of 221 . A portion of each of the second electrodes 242 is received in each of the second holes 222 to correspond to the shape of the second holes 222, and a portion of the second electrode 242 protrudes beyond the corresponding second holes 222. In practice, the plurality of first electrodes 241 and the plurality of second electrodes 242 may not protrude beyond the plurality of first holes 221 and the plurality of second holes 222, respectively.

Further, if the substrate 21 uses the p-type semiconductor substrate 21, the front surface electric field region 216 is formed as a p ⁺ -type semiconductor having a doping concentration greater than that of the substrate 21, and the plurality of second doped regions 214 are formed. A p ⁺⁺ type semiconductor having a doping concentration greater than that of the substrate 21 is formed, and the plurality of first doped regions 213 are formed as an n ⁺ type semiconductor. At this time, the plurality of first electrodes 241 are negative electrodes, and the plurality of second electrodes 242 are positive electrodes.

In addition, the solar cell 2 of the present embodiment is described by taking a plurality of first doping regions 213, a plurality of second doping regions 214, and a plurality of spacer regions 215 as an example. The plurality of first doping regions 213 And the plurality of second doping regions 214 are repeatedly arranged in an interleaved manner of pnpn, and a spacer 215 is formed between any adjacent first doping regions 213 and second doping regions 214. It is also possible to improve only one of the first doped regions 213, the second doped regions 214, and the spacers 215.

The electrical transmission unit 3 of the present embodiment is disposed on the back surface 212 of the solar cell 2. The electrical transmission unit 3 includes a first metal layer 31, a second metal layer 32, and a first metal layer 31. The second metal layer 32 is located between the insulating films 33 between them. In this embodiment, the material of the first metal layer 31 and the second metal layer 32 may be copper, and the material of the insulating film 33 may be polyethylene terephthalate (PET). However, it is not limited to the foregoing examples.

The first metal layer 31 and the second metal layer 32 of the embodiment are not located on the same plane, and the first metal layer 31 is located at the second metal layer. 32 is between the solar cell 2. It should be noted that the first metal layer 31 and the second metal layer 32 may be a fork-like structure as shown in FIG. 2, or a rectangular sheet-like structure or the like, and are not particularly limited.

The first metal layer 31 has a first portion 311 extending to one side of the insulating film 33, and the second metal layer 32 has a second portion 321 extending to the other side of the insulating film 33. In other words, the first metal layer 31 and the second metal layer 32 respectively have a first portion 311 and a second portion 321 extending to opposite sides of the insulating film 33. The first portion 311 and the second portion 321 are exposed without being covered by the insulating film 33.

Further, at least one of the first portion 311 and the second portion 321 extends out of one side of the solar cell 2. In this embodiment, only the second portion 321 extends beyond one side of the solar cell 2, and the first portion 311 does not extend beyond the side edge of the solar cell 2. However, in practice, only the first portion 311 extends out of one side of the solar cell 2, or the first portion 311 and the second portion 321 respectively extend out of the solar cell 2 There is no restriction beyond the opposite side. In addition, the positions of the first metal layer 31 and the second metal layer 32 can also be interchanged up and down.

The insulating film 33 of the present embodiment separates the first metal layer 31 and the second metal layer 32, and has a plurality of first openings 331 respectively corresponding to a plurality of first electrodes 241, and a plurality of respectively The second opening 332 of the plurality of second electrodes 242 is corresponding. Each of the first openings 331 is for the first metal layer 31 to be exposed, and each of the second openings 332 is for the second gold The genus layer 32 is exposed.

The first metal layer 31 of the present embodiment is connected to the corresponding first electrode 241 via the first opening 331. The second metal layer 32 of the embodiment is connected to the corresponding second electrode via each of the second openings 332. 242.

The material of the first conductive portion 41, the second conductive portion 42, the third conductive portion 43 and the fourth conductive portion 44 of the present embodiment may be solder, and the materials of the first metal layer 31 and the second metal layer 32. different. Each of the first conductive portions 41 is disposed in each of the first openings 331 to connect the first metal layer 31 and the corresponding first electrode 241. Each of the second conductive portions 42 is disposed in each of the second openings 332 to connect the second metal layer 32 and the corresponding second electrode 242. Each of the third conductive portions 43 is disposed on the first portion 311 of the first metal layer 31 and located on the lower surface of the first portion 311, and each of the fourth conductive portions 44 is disposed on the second metal layer The second portion 321 of the 32 is located on the upper surface of the second portion 321.

It should be noted that, in implementation, the insulating film 33 may cover the first portion 311 of the first metal layer 31 and the second portion 321 of the second metal layer 32. At this time, the insulating film 33 may be And a plurality of third openings (not shown) exposing the first portion 311, and a plurality of fourth openings (not shown) exposing the second portion 321 and the plurality of third openings The direction of the opening of the plurality of fourth openings is opposite to the upper and lower sides. The plurality of third conductive portions 43 are respectively disposed in the plurality of third openings, and the plurality of fourth conductive portions 44 are respectively disposed in the plurality of fourth openings.

Referring to FIG. 5, in addition, the plurality of first openings 331' and the plurality of second openings 332' may extend through the insulating film. a through hole of 33', and the first metal layer 31' and the second metal layer 32' respectively extend into the plurality of first openings 331' and the plurality of second openings 332', and respectively The first electrodes 241 are connected to the plurality of second electrodes 242, wherein the plurality of first conductive portions 41' and the plurality of second conductive portions 42' are correspondingly disposed in the plurality of first openings in a through form. 331 ′ and the plurality of second openings 332 ′, and after heating, the first metal layer 31 ′ and the second metal layer 32 ′ are respectively connected to the plurality of first electrodes 241 and the plurality of Second electrode 242. This method is a design through the through hole, which makes it easier to align the solar cell 2 with the electrical transmission unit 3'. When the plurality of first openings 331' and the plurality of second openings 332' are in a through-type design, the first metal layer 31' and the second metal layer 32' pass through the insulating film 33'. Isolated and insulated.

It should be noted that, in this aspect, the first metal layer 31 ′ further has a plurality of first holes 310 ′ corresponding to the plurality of first openings 331 ′ and accommodated by the plurality of first conductive portions 41 ′. The second metal layer 32' further has a plurality of second holes 320' corresponding to the plurality of second openings 332' and accommodated by the plurality of second conductive portions 42'. However, in practice, it is not necessary to form the plurality of first holes 310' and the plurality of second holes 320'.

Further, in this aspect, the insulating film 33' may also cover the first portion 311' of the first metal layer 31' and the second portion 321' of the second metal layer 32'. In this case, the insulating film 33 may further have a plurality of third openings (not shown) exposing the first portion 311', and a plurality of fourth openings exposing the second portion 321' (not shown) Show), and And at least one of the plurality of third openings and the plurality of fourth openings may be through holes.

Referring to Figures 3, 6, and 7, the solar battery module 1 of the present embodiment can be assembled in a plurality of groups and connected to each other in a left and right direction. The assembly method includes:

Step S01: providing the plurality of solar cells 2 and the plurality of electrical transmission units 3.

Step S02: align the first opening 331 and the second opening 332 of each of the electric transmission units 3 with the first electrode 241 and the second electrode 242 of each solar cell 2, respectively.

Step S03: providing a heat source such that the first metal layer 31 and the second metal layer 32 exposed at each of the first openings 331 and each of the second openings 332 are respectively connected to the plurality of first electrodes 241 and the plurality of The two electrodes 242, in turn, combine the solar cells 2 and the electric transmission unit 3 corresponding to each other to constitute the plurality of solar battery cells 1, respectively. The heat source may specifically be a far-infrared heat source, an ultrasonic heat source or a laser heat source, and the like, and is not limited.

Specifically, in the embodiment, the plurality of first conductive portions 41 are disposed in the plurality of first openings 331, and the plurality of second conductive portions 42 are disposed in the plurality of second openings 332, and the heat source is utilized. The plurality of first conductive portions 41 and the plurality of second conductive portions 42 are heated and melted, and the first metal layer 31 is electrically connected to the plurality of first electrodes 241 through the plurality of first conductive portions 41, respectively. The second metal layer 32 can also be connected to the plurality of second electrodes 242 through the plurality of second conductive portions 42.

It should be noted that, in the fabrication, the first metal layer 31 may have a portion extending into the plurality of first openings 331, and the extension portion of the first metal layer 31 may be heated and heated by the heat source. The first metal layer 31 can be directly connected to the plurality of first electrodes 241 without passing through the plurality of first conductive portions 41. The second metal layer 32 is also the same and will not be described in detail.

In addition, in the embodiment, the plurality of first conductive portions 41 and the plurality of second conductive portions 42 are disposed in the first opening 331 and the second opening 332 of the electrical transmission unit 3, respectively. Then heat welding. However, in practice, the plurality of first conductive portions 41 and the plurality of second conductive portions 42 may be respectively disposed on the first electrode 241 and the second electrode 242 of the solar cell 2, and then heated to be soldered and bonded. Corresponding solar cell 2 and electrical transmission unit 3.

Step S04: connecting the above-mentioned electric transmission unit 3 to which the solar cell 2 is connected, and another electric transmission unit 3 to which the solar cell 2 is connected, wherein any two adjacent electric transmission units 3 are connected to each other by the first part The portion 311 and the second portion 321 are connected to each other, so that the plurality of solar battery modules 1 are assembled in connection with each other.

Specifically, in this embodiment, the plurality of third conductive portions 43 are respectively disposed on the first portion 311 of each solar battery group 1, and the plurality of third conductive portions 43 are disposed on the second portion 321 of each solar battery group 1. The fourth conductive portion 44 heats and melts the plurality of third conductive portions 43 and the plurality of fourth conductive portions 44 by using the heat source, so that the first portion of each of the two adjacent electrical transmission units 3 311 and the second part 321 can pass the complex A plurality of third conductive portions 43 are connected to the plurality of fourth conductive portions 44.

It should be noted that each solar cell stack 1 may also have only one of the third conductive portion 43 and the fourth conductive portion 44. In this step, the adjacent first portion 311 and the second portion may also be connected. Part 321. In practice, when the third conductive portion 43 and the fourth conductive portion 44 are absent, the first portion 311 and the second portion 321 are directly heated and melted by the heat source, and then the adjacent electrical transmission unit 3 is A portion 311 and a second portion 321 can be directly connected to each other without passing through the plurality of third conductive portions 43 and the plurality of fourth conductive portions 44.

Referring to FIG. 8 , after the assembly, the plurality of solar battery modules 1 can be combined with other component packages to form a solar battery module 5 . The solar battery module 5 includes: a first plate 51 spaced apart from each other. And a plurality of solar panels 1 disposed between the first sheet 51 and the second sheet 52, and between the first sheet 51 and the second sheet 52 and contacting the plurality The package material 53 of the solar battery pack 1. Of course, the number of solar battery cells 1 in a module can also be only one.

In this embodiment, the materials of the first plate 51 and the second plate 52 are not particularly limited in implementation, and glass or plastic plates may be used, and the plates on the light receiving side of the plurality of solar cells 1 must be transparent. Light. The material of the package material 53 is, for example, a light-transmissive ethylene vinyl acetate copolymer (EVA), or other related materials usable for the solar cell module package, and is not limited to the examples of the embodiment.

Referring to Figures 2, 3, 4, and 7, from the above description, the present implementation The first electrode 241 and the second electrode 242 of the solar cell 2 do not overlap the back surface 212 of the substrate 21, but are arranged in a dot shape independently of each other and are respectively accommodated in the first hole 221 of the dielectric layer 22 and In the second hole 222, the consumption of the conductive paste covering the surface of the dielectric layer 22 can be saved, so that the solar cell 2 of the present embodiment does reduce the amount of the conductive paste and can reduce the production cost.

At the same time, the electric energy of the solar cell 2 is outwardly led out through the electric transmission unit 3 of the embodiment, and since the contact point between the electric transmission unit 3 and the solar cell 2 is also distributed in a dot shape, even the first of the solar cell 2 The occurrence of power interruption between one of the electrode 241 and the second electrode 242 and the metal layer of the electrical transmission unit 3, the electrical transmission unit 3 can still be electrically connected to the other electrode to continuously generate the solar battery 2 The electric energy of the solar cell 1 of the present embodiment has a better current collecting effect.

More importantly, the first metal layer 31 and the second metal layer 32 disposed in the insulating film 33 can increase the structural strength of the entire electrical transmission unit 3, and the electrical transmission unit 3 excellent in structural strength is supported by the electrical transmission unit 3 Below the solar cell 2, the strength of the solar cell 2 can be increased to avoid fragmentation, thereby increasing the service life of the solar cell 1.

Referring to Figures 9, 10 and 11, a second preferred embodiment of the solar cell stack 1 of the present invention is substantially identical to the first preferred embodiment, the difference between the two being: the structure of the electrical transmission unit 3.

The electrical transmission unit 3 of the present embodiment includes a plurality of first metal layers 31 that are on the same plane and are staggered along a first direction 81. And a plurality of second metal layers 32, and an insulating film 33 covering the plurality of first metal layers 31 and the plurality of second metal layers 32.

Each of the first metal layers 31 and each of the second metal layers 32 form a group, and in one set, the first metal layer 31 extends in a second direction 82 perpendicular to the first direction 81. And having a first portion 311 extending to one side of the insulating film 33; the second metal layer 32 is slightly L-shaped and has a parallel portion 322 spaced apart from the first metal layer 31, and A second portion 321 extending from the parallel portion 322 to the other side of the insulating film 33. The second portion 321 has a disposed end 323 which is bent and extends relative to the parallel portion 322 and is disposed corresponding to the fourth conductive portion 44. The disposed end 323 is parallel to the corresponding first metal layer 31. The second conductive portion 44 on the disposed end 323 of one of the electrical transmission units 3 and the third conductive portion 3 on the other electrical transmission unit 3 may be connected to the two adjacent solar battery modules 1 in the two directions. The conductive portion 43 is connected in the opposite direction.

The insulating film 33 has a plurality of first openings 331 respectively for which one of the first metal layers 31 is exposed, and a plurality of second openings 332 respectively for which one of the second metal layers 32 is exposed.

In addition, the plurality of solar battery modules 1 of the present embodiment may also be combined with the first plate (not shown), the second plate (not shown), and the package as described above. The solar cell module (not shown) is formed by encapsulation and is not described in detail.

In this embodiment, the plurality of first metal layers 31 and the plurality of second metal layers 32 are disposed on the same plane, so that the electrical transmission unit can be The thickness of 3 is thinned, and therefore, the solar cell 1 of the present embodiment can be applied to a solar cell module having thinning and light weight requirements.

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.

1‧‧‧Solar battery pack

2‧‧‧Solar battery

21‧‧‧Substrate

211‧‧‧ positive

212‧‧‧Back

213‧‧‧First doped area

214‧‧‧Second doped area

215‧‧‧ interval zone

216‧‧‧ front surface electric field

22‧‧‧Dielectric layer

221‧‧‧ first hole

222‧‧‧ second hole

23‧‧‧Anti-reflective layer

241‧‧‧First electrode

242‧‧‧second electrode

3‧‧‧Electrical transmission unit

31‧‧‧First metal layer

311‧‧‧ first part

32‧‧‧Second metal layer

321‧‧‧ second part

33‧‧‧Insulation film

331‧‧‧ first opening

332‧‧‧ second opening

41‧‧‧First Conductive Department

42‧‧‧Second Conductive Department

43‧‧‧ Third Conductive Department

44‧‧‧fourth conductive part

Claims (9)

A solar battery module comprising: a solar cell comprising: a substrate, of a second conductivity type, and including a front surface and a back surface opposite to each other; at least one first doped region, being of a first conductivity type, and located at The second doped region is of a second conductivity type and located within the back surface; a dielectric layer is disposed on the back surface and has a plurality of corresponding first doped regions respectively a first hole, and a plurality of second holes respectively corresponding to the second doping region; a plurality of first electrodes, each of the first electrodes being located in each of the first holes and connected to the first doping region, and the plurality The first electrodes are not in contact with each other; and the plurality of second electrodes are located in each of the second holes and connected to the second doped region, and the plurality of second electrodes are not in contact with each other And an electrical transmission unit disposed on the back surface of the solar cell, the electrical transmission unit includes: a first metal layer and a second metal layer; and an insulation covering the first metal layer and the second metal layer Membrane, the insulating film has a plurality of separate A pair of first openings to be a plurality of first electrodes, and a plurality of the multifilament correspond respectively a second opening of the plurality of second electrodes, wherein the first metal layer is connected to the corresponding first electrode via each of the first openings, and the second metal layer is connected to the corresponding second electrode via each of the second openings. The solar cell of claim 1, wherein the first metal layer and the second metal layer respectively have a first portion and a second portion extending to opposite sides of the insulating film At least one of the first portion and the second portion extends out of one side of the solar cell. The solar battery unit according to claim 1, further comprising a plurality of first conductive portions and a plurality of second conductive portions different from materials of the first metal layer and the second metal layer, each of the first conductive portions being disposed The first metal layer and the corresponding first electrode are connected to each of the first openings, and each of the second conductive portions is disposed in each of the second openings to connect the second metal layer and the corresponding second electrode. The solar battery unit according to claim 3, wherein the plurality of first openings and the plurality of second openings are through holes penetrating the insulating film. The solar cell of claim 1, wherein the first metal layer and the second metal layer are not on the same plane. The solar cell of claim 1, wherein the first metal layer and the second metal layer are in the same plane. A solar cell module comprising: a first plate; a second plate; at least one solar energy according to any one of claims 1 to 6. The pool group is disposed between the first plate and the second plate; and a package material is located between the first plate and the second plate and contacts the solar battery. A method for assembling a solar battery module, comprising: providing a plurality of solar cells, each solar cell having a plurality of first electrodes and a plurality of second electrodes having opposite polarities and on the same side; providing a plurality of electrical transmission units, each The electrical transmission unit includes a first metal layer and a second metal layer, and an insulating film covering the first metal layer and the second metal layer, each insulating film having a plurality of corresponding first electrodes respectively a first opening for exposing the first metal layer, and a plurality of second openings respectively corresponding to each of the second electrodes and exposing the second metal layer, and the first metal layer and the second metal layer respectively have an extension a first portion and a second portion at two opposite sides of the insulating film, at least one of the first portion and the second portion extending out of a side of the solar cell Aligning the first opening and the second opening of each of the electrical transmission units with the first electrode and the second electrode of each solar cell; providing a heat source to be exposed at each of the first openings and each of the second openings a first metal layer and a second metal layer respectively connected to the plurality of first electrodes and the plurality of second electrodes; and connecting the electrical transmission unit connected to the solar cell to another electrical transmission unit connected to the solar battery Any two adjacent electrical transmission units are made between the first part and the second part of each other connection. The method of assembling a solar battery module according to claim 8, wherein a plurality of first conductive portions and a plurality of second conductive portions different from materials of the first metal layer and the second metal layer are further provided, each The first conductive portion is disposed in each of the first openings to connect the first metal layer and the corresponding first electrode, and each of the second conductive portions is disposed in each of the second openings to connect the second metal layer and the corresponding Second electrode.