CN210040229U - Solar cell string group and solar cell module - Google Patents

Abstract

The utility model provides a solar cell string group and solar module, this solar cell string group includes: the solar cell system comprises a plurality of solar cell strings, a plurality of solar cell modules and a control module, wherein each solar cell string is formed by connecting two adjacent rows of solar cells in series, and each row comprises a plurality of solar cells; bus bars disposed at both side ends of a plurality of strings of solar cells to serially connect the plurality of strings of solar cells to each other; the number of the embedded bypass switches is the same as that of the solar cell strings, and the embedded bypass switches are respectively lapped in the bus bar and are respectively positioned in the middle positions of two rows of each solar cell string to form a bypass.

Description

Solar cell string group and solar cell module

Technical Field

The utility model relates to a solar energy power generation technical field relates to a solar cell cluster and solar module.

Background

In a solar cell module, in order to avoid that a cell is continuously heated under a large current to cause a "hot spot effect" and even burn out the module, a bypass diode is generally adopted. When the solar cell module is not shielded by the shadow, the cell slice normally generates electricity under the irradiation of sunlight, the bypass diode is in a reverse cut-off state at the moment, and current does not pass through the diode; when part of the battery piece is shielded by the shadow, the shielded battery piece has the resistance characteristic, forward voltage drop appears at two ends of the bypass diode, the diode is conducted, and part of the photo-generated current passes through the diode to play a role in electrical protection.

In general, the bypass diode is a schottky diode and is packaged inside the solar junction box, however, the schottky diode has high junction temperature, and the solar junction box is usually designed to be wide enough to meet the heat dissipation requirement, resulting in more material loss. In addition, the electrostatic resistance of the schottky diode is weak, and the electrostatic breakdown of the schottky diode is easily caused by improper environmental factors or antistatic measures in the production and installation processes of the junction box. Further, in the design process of the cell module, in order to connect the bypass diode in the junction box in series and parallel with the module cell, more solar bus bars and insulating materials are consumed.

SUMMERY OF THE UTILITY MODEL

In view of this, the present invention provides a solar cell string set which helps to reduce the overall size of a solar cell module and helps to reduce damage to a solar module packaging material due to an excessively high temperature of a diode.

An object of the utility model is also to provide a solar module who has above-mentioned solar cell cluster group.

In order to solve the technical problem, the utility model discloses a following technical scheme:

according to the utility model discloses solar cell string group of first aspect embodiment includes:

the solar cell system comprises a plurality of solar cell strings, a plurality of solar cell modules and a control module, wherein each solar cell string is formed by connecting two adjacent rows of solar cells in series, and each row comprises a plurality of solar cells;

a bus bar disposed at one side end of the plurality of strings of solar cells to connect the plurality of strings of solar cells to each other in series;

the number of the embedded bypass switches is the same as that of the solar cell strings, and the embedded bypass switches are respectively lapped in the bus bar and are respectively positioned in the middle positions of two rows of each solar cell string to form a bypass.

Optionally, the in-cell bypass switch is a MOS integrated circuit bypass switch.

Preferably, the solar cell string set comprises three strings of the solar cell, and the solar cell string set comprises three in-line bypass switches.

Optionally, a DFN package structure is employed between the in-cell bypass switch and the bus bar.

Optionally, each solar string is formed by serially connecting a plurality of half-cell, the plurality of solar cell strings are arranged in two rows in the length direction, and the bus bars of the two rows of solar cell strings are arranged adjacently.

According to the utility model discloses solar module of second aspect embodiment, from the top down coincide in proper order has photovoltaic glass, above-mentioned arbitrary solar cell cluster group, backplate, solar module still includes two terminal boxes, two the terminal box sets up respectively the both sides edge on the long limit of backplate, the busbar pass respectively form in the through-hole of backplate with correspond the terminal box links to each other.

Optionally, the solar cell module further comprises: the plurality of cushion blocks are adhesive film cushion blocks or insulating cushion blocks, and the plurality of cushion blocks are respectively arranged at the plurality of embedded bypass switches in a one-to-one correspondence mode.

Optionally, the long side of the junction box is parallel to the long side of the solar cell module.

Optionally, the junction box comprises:

a box body, wherein a chamber is formed in the box body;

the box cover is matched with the box body to seal the cavity;

the metal conductor is arranged in the cavity, a bus bar limiting hole is formed in the metal conductor, and the bus bar penetrates through the bus bar limiting hole to be connected with the metal conductor;

a lead connected to the metallic conductor to output electrical energy to a power consuming circuit,

the bus bar limiting hole extends along the long side direction of the solar cell module.

Optionally, the solar module further comprises a frame support, and the frame is sleeved outside the photovoltaic glass, the solar cell string group and the back plate.

Preferably, the frame is an insulating frame, the box body of the junction box and the frame are integrally formed, a bus bar through hole is formed in the frame, the junction box is arranged on the frame, and the bus bar penetrates out from between the back plate and the photovoltaic glass and passes through the bus bar through hole to be connected with the junction box.

When the solar cell string is formed by connecting a plurality of half cells in series, correspondingly, the junction box is positioned in the middle of the two side edges of the long edge of the solar cell module.

The above technical scheme of the utility model following beneficial effect has at least:

1. according to the solar cell string group provided by the embodiment of the utility model, the bypass switch is sealed into the inside of the component, so that the consumption of the whole packaging material of the solar component can be reduced when the solar component is assembled by using the bypass switch;

2. for the assembly using the split junction box, the bypass switch is embedded in the bus bar, so that an intermediate junction box is not needed, the number of the split junction boxes can be reduced from three to two, and the material cost and the processing time of the assembly are saved;

3. because the intermediate junction boxes are reduced and only the connection bus bars need to be considered in the junction boxes, the opening size of the back plate and the number of holes on the back glass are effectively reduced, and the insulating and voltage-resisting capacity of the solar module is improved;

4. the size of the opening of the back plate and the number of holes on the back glass are effectively reduced, so that the mechanical load capacity of the solar module is improved.

Drawings

Fig. 1 is an exploded view of a solar cell module according to an embodiment of the present invention;

fig. 2 is a partial schematic view of a solar cluster according to an embodiment of the present invention;

fig. 3 is a schematic diagram for explaining a position of a junction box in a solar cell module according to an embodiment of the present invention;

fig. 4 is an exploded view of a junction box in a solar module according to an embodiment of the present invention;

fig. 5 is an exploded view of a solar cell module according to another embodiment of the present invention;

fig. 6 is a schematic view for explaining a position of a junction box in a solar cell module according to another embodiment of the present invention;

FIG. 7a is a schematic structural view of a junction box and an aluminum frame bracket in the solar cell module shown in FIG. 6;

fig. 7b is a structural schematic diagram of the junction box and the aluminum frame bracket shown in fig. 7a from a reverse view.

Detailed Description

The following first describes the solar cell module 100 according to an embodiment of the present invention with reference to the drawings.

As shown in fig. 1, the solar cell module 100 according to the embodiment of the present invention is stacked with the photovoltaic glass 7, the solar cell string, and the back plate 6 in sequence from top to bottom (from top to bottom as described herein, in terms of the light irradiation proceeding direction, that is, the light incident surface is upward, specifically, in fig. 1, the lower right side is upward, and the upper left side is upward). The solar cell module 100 further includes two junction boxes 8, the two junction boxes 8 are respectively disposed at two side edges of the long side of the back sheet 6, and the bus bars 1 respectively penetrate through holes formed in the back sheet 6 to be connected to the corresponding junction boxes 8.

As shown in fig. 1 and fig. 2, a solar cell string set according to an embodiment of the present invention includes: a plurality of solar cell strings, a bus bar 1, and a plurality of in-cell bypass switches 2.

Wherein, each solar cell string is formed by connecting two adjacent rows of solar cells 3 in series, and each row comprises a plurality of solar cells 3. The solar cell string set in the solar cell module 100 shown in fig. 1 has 6 rows of solar cells 3, that is, 3 solar cell strings are strung two by two, and 10 solar cells 3 are formed in each row.

The bus bar 1 is provided at both side ends (upper end in fig. 1, but the present invention is not limited thereto) of the plurality of solar cell strings to connect the plurality of solar cell strings in series with each other.

The number of the in-cell bypass switches 2 is the same as that of the solar cell strings, the in-cell bypass switches 2 are respectively overlapped in the bus bar 1, and each in-cell bypass switch 2 is respectively positioned at the middle position of two rows of each solar cell string (as shown in fig. 2) to form a bypass.

In some embodiments of the present invention, as shown in fig. 1, the solar cell string set includes three strings of the solar cell string, and accordingly, the solar cell string set includes three embedded bypass switches 2.

Preferably, the in-line bypass switch 2 is a MOS (Metal-Oxide-Semiconductor) integrated circuit bypass switch.

As the embedded bypass switch 2, the MOS integrated circuit bypass switch is consistent with the application principle of the traditional bypass diode, namely when the solar cell module is shielded by shadow, the bypass is shielded by the cell string where the cell sheet is located, and the effect of protecting the solar cell module is achieved. However, unlike the conventional bypass diode acting inside the solar junction box, the MOS integrated circuit bypass switch is directly laminated inside the solar cell module due to its small thickness. The MOS integrated circuit bypass switch comprises a charge pump, a reference comparator, an MOSFET (Metal-Oxide-Semiconductor Field-Effect Transistor) driving circuit, a ring oscillator, a capacitor and the like, and is characterized by low junction temperature and low power consumption.

The working principle of the MOS integrated circuit bypass switch is as follows: when the solar module works normally, the MOS tube is disconnected, and no current passes through a parasitic diode on the MOS tube; if the component is shielded, voltage reverse bias among the battery strings is generated, the photoproduction current passes through the parasitic diode, and the forward bias of the diode activates the charge pump to charge the capacitor; when the voltage of the capacitor is increased to a preset high value, the charge pump stops working, and meanwhile, the MOS tube controller controls the conduction of the MOS tube by using the electric energy of the capacitor, at the moment, part of the photo-generated current of the component passes through the source electrode to the drain electrode of the MOS tube, so that the function of protecting and shielding the battery piece is achieved; when the voltage of the capacitor is reduced to a preset low value, the MOS tube controller disconnects the MOS tube, the parasitic diode recharges the capacitor at the moment, and the steps are sequentially circulated until the shielding disappears.

Preferably, the MOS integrated circuit bypass switch is packaged together with the bus bar 1 by using a conventional package structure of Double Flat No-lead (DFN), which is composed of an epoxy resin layer, a conductive substrate, and a conductive pad. The conductive substrate is connected with the drain electrode of the MOSFET, and the grid electrode of the MOSFET is connected with the conductive bonding pad so as to meet the requirements of forward conduction and reverse cut-off. The whole thickness of the packaging mode can be controlled within 1mm, the total thickness of a conventional single-glass assembly packaging material (EVA film) and a battery string after lamination is 0.7-0.8mm, and the total thickness of a double-glass assembly packaging material (EVA film or PO film) and a battery string after lamination is 1mm, wherein the EVA film is a polyethylene-polyvinyl acetate copolymer for short, and the PO (polyolefin) film is a polyolefin film. Therefore, the photovoltaic module can be packaged inside the photovoltaic module.

In the solar cell module 100 according to the embodiment of the present invention, the encapsulation adhesive films 4, such as EVA adhesive film or PO adhesive film, can be further disposed on the surfaces of the two sides of the solar cell string set.

Further, in order to prevent stress concentration between the module backplane and the glass due to the fact that the thickness of the EVA at the bypass switch 2 is too thin, and the module backplane is abraded or pressed and exploded by the glass, as shown in fig. 2, the solar cell module 100 may further include a plurality of spacers 17, the plurality of spacers 17 may be insulating spacers (specifically, for example, EVA film spacers or PO film spacers), and the plurality of spacers 17 are respectively disposed at the plurality of embedded bypass switches 2 in a one-to-one correspondence manner.

Preferably, as shown in fig. 3, the long side of the junction box 8 is kept parallel to the long side of the solar cell module 100, which helps to reduce the amount of the cable 13 used.

As shown in fig. 4, the junction box 8 of the present invention adopts a design without bypass diode, and the junction box 8 includes: box body 12, box cover 15, metal conductor 11, wire 13.

A chamber is formed in the cartridge body 12. The lid 15 cooperates with the body 12 to close the chamber. The box cover 15 is preferably designed in an embedded manner, which advantageously controls the size of the junction box 8.

The metal conductor 11 is arranged in the cavity, and a bus bar limiting hole 16 is formed in the metal conductor 11. When the solar cell module 100 is assembled, the bus bar 1 passes through the bus bar positioning hole 16 and is connected to the metal conductor 11. The lead wire 13 is connected to the metallic conductor 11 to output electric energy to the consumer circuit.

According to the utility model discloses, there is not bypass diode in the terminal box 8, can make its physical space and the heat dissipation space that omits bypass diode, terminal box 8 can be done littleer under the prerequisite that satisfies creepage distance. This also directly reduces the overall size of the photovoltaic module.

As shown in fig. 4, the bus bar stopper hole 16 extends along the longitudinal direction of the solar cell module 100. In fig. 1, since the longitudinal direction of the junction box 8 coincides with the direction of the solar cell module 100, the bus bar positioning hole 16 may be said to extend along the longitudinal direction of the junction box 8. In this case, it is advantageous to further reduce the size of the junction box 8 while satisfying the creepage distance.

As shown in fig. 1, the solar cell module 100 may further include a frame 10, the frame 10 may be an aluminum frame, and the frame 10 is disposed on the outer sides of the photovoltaic glass 7, the solar cell string, and the back sheet 6.

In some embodiments, the frame 10 may be an insulating bezel, and the box 12 of the junction box 8 is integrally formed with the frame 10. As shown in fig. 6-7 b, a bus bar through hole 20 may be formed on the frame 10, and the junction box 8' may be disposed on the frame 10, and when assembling, the bus bar 1 may pass through between the back sheet 6 and the photovoltaic glass 7 and pass through the bus bar through hole 20 to be connected to the junction box 8. This can further reduce the opening size of the back plate 6.

According to the utility model discloses solar cell cluster group, embedded bypass switch 2's design can be used to in half solar module type. As shown in fig. 5, each of the solar strings is formed by serially connecting a plurality of half cells, the plurality of solar strings are arranged in two rows in the length direction, and the bus bars 1 of the two rows of solar strings are adjacently arranged. That is, as shown in fig. 5, the bus bar 1 is located at the middle of the two rows of the solar cell strings, and accordingly, the junction box 8 is located at the middle of the two side edges of the long side of the solar cell module.

The foregoing is a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of improvements and decorations can be made without departing from the principle of the present invention, and these improvements and decorations should also be regarded as the protection scope of the present invention.

Claims (10)

1. A solar cell string, comprising:

a plurality of solar cell strings, each solar cell string being formed by connecting two adjacent columns of solar cells (3) in series, each column including a plurality of the solar cells (3);

bus bars (1), the bus bars (1) being disposed at both side ends of a plurality of strings of the solar cells to connect the plurality of strings of the solar cells in series with each other;

the number of the embedded bypass switches (2) is the same as that of the solar cell strings, and the embedded bypass switches (2) are respectively lapped in the bus bar (1) and are respectively positioned in the middle positions of two rows of each solar cell string to form a bypass.

2. The solar cell string according to claim 1, wherein the in-line bypass switch (2) is a MOS integrated circuit bypass switch.

3. The solar cell string according to claim 1, wherein a DFN encapsulation structure is used between the in-line bypass switch (2) and the bus bar (1).

4. The solar cell string assembly according to claim 1, wherein each of the solar cell strings is formed by connecting a plurality of half cells in series, the plurality of solar cell strings are arranged in two rows in a length direction, and the bus bars (1) of the two rows of solar cell strings are adjacently arranged.

5. A solar cell module, which is characterized in that a photovoltaic glass (7), a solar cell string set according to any one of claims 1 to 4, and a back plate (6) are sequentially stacked on the solar cell module from top to bottom, the solar cell module further comprises two junction boxes (8), the two junction boxes (8) are respectively arranged on two side edges of a long edge of the back plate (6), and two bus bars (1) located on the edges of the module respectively penetrate through holes formed in the back plate (6) to be connected with the corresponding junction boxes (8).

6. The solar cell assembly of claim 5, further comprising: the embedded bypass switch comprises a plurality of cushion blocks (17), wherein the cushion blocks (17) are adhesive film cushion blocks or insulating cushion blocks, and the cushion blocks (17) are respectively arranged at the embedded bypass switches (2) in a one-to-one correspondence mode.

7. Solar cell assembly according to claim 5, characterized in that the junction box (8) comprises:

a box body (12), wherein a cavity is formed in the box body (12);

the box cover (15) is matched with the box body (12) to seal the cavity;

the metal conductor (11) is arranged in the cavity, a bus bar limiting hole (16) is formed in the metal conductor (11), and the bus bar (1) penetrates through the bus bar limiting hole (16) to be connected with the metal conductor (11);

a lead wire connected to the metallic conductor (11) to output electric energy to a consumer circuit,

wherein the bus bar limiting hole (16) extends along the long side direction of the solar cell module.

8. The solar cell module according to claim 7, further comprising a frame (10), wherein the frame (10) is disposed on the outer side of the photovoltaic glass (7), the solar cell string and the back sheet (6).

9. The solar cell module according to claim 8, wherein the frame is an insulating frame, the box body (12) of the junction box (8) is integrally formed with the frame (10), a bus bar through hole (20) is formed on the frame (10), a junction box (8') is disposed on the frame (10), and the bus bar (1) penetrates between the back sheet (6) and the photovoltaic glass (7) and is connected with the junction box (8) through the bus bar through hole (20).

10. The solar cell module according to claim 5, wherein the solar cell string set is the solar cell string set according to claim 4, and the junction box (8) is located at the middle position of two side edges of the long side of the solar cell module.

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