CN217881541U

CN217881541U - Multi-segment photovoltaic module

Info

Publication number: CN217881541U
Application number: CN202221861066.6U
Authority: CN
Inventors: 李辉; 吴韦; 陈晨; 马鹏; 倪建雄; 林建伟
Original assignee: Jolywood Taizhou Solar Technology Co ltd
Current assignee: Jolywood Taizhou Solar Technology Co ltd
Priority date: 2022-07-19
Filing date: 2022-07-19
Publication date: 2022-11-22
Anticipated expiration: 2032-07-19

Abstract

The utility model relates to a multi-segment photovoltaic module, the inside wire jumper busbar design that uses of circuit, the wire jumper busbar respectively with middle busbar contact, and through optimizing internal circuit, make the current path between first battery piece and the third battery piece obtain optimizing, reach and reduce the electrical loss purpose, and adopt sharing wire jumper busbar design, make first diode and second diode possible to locate first wire jumper busbar both sides, and both distances can accomplish enough closely so that install to same terminal box jointly, reach and reduce terminal box quantity, reach and improve and shelter from the purpose that the influence sheltered from partial hot spot reliability.

Description

Multi-segment photovoltaic module

Technical Field

The utility model belongs to the technical field of photovoltaic power generation and specifically relates to a many burst photovoltaic module is related to.

Background

With the continuous development of the photovoltaic industry of solar cells, the market has higher and higher requirements on the power of a photovoltaic module, and how to improve the power of the photovoltaic module and reduce the cost of the module is a technical problem which is always concerned by research and development personnel, so that many research and development personnel have worked on the size of a cell and expand the size of the cell in a slicing combination mode. Because the conventional battery piece on the market is only subjected to slicing treatment at present, the interior of a circuit is not subjected to optimization design, and the size of the battery piece is larger and larger, the battery current is higher and higher, the internal electric loss of a photovoltaic module is higher and higher, and the power of the photovoltaic module is low.

In the solar module disclosed in CN201510755798.5, as shown in fig. 3, the internal circuit is that each parallel unit formed by parallel connection of batteries adopts a serial connection method, wherein diodes are used for protection, and two diodes are required for three parallel modules. In actual use, the diode needs to be installed in the junction box, and the junction box can shield the battery piece in solar photovoltaic power generation, so that the reliability of shielding partial hot spots is influenced, and therefore, although the scheme optimizes an internal circuit, the problem of low power of a photovoltaic module still exists.

Patent CN201721646993.5 is a single-side structure, patent CN202022546801.1 adopts a top-bottom layered (double-side) structure, the area utilization rate of the battery size is higher than that of a single side, but the required diodes bring loads, and meanwhile, no proposal for reducing the use of the junction box is provided, and the gain and reliability of the module power are limited.

SUMMERY OF THE UTILITY MODEL

The utility model discloses to solve along with the battery piece size is bigger and bigger, battery current is higher and higher, the inside electrical loss of subassembly big and then the problem that the subassembly power that leads to is low, reduces terminal box quantity simultaneously as far as possible and shelters from the influence in order to improve and shelter from partial hot spot reliability.

To this end, a multi-segment photovoltaic module is provided, comprising:

an intermediate bus bar;

the battery comprises a first battery piece and a second battery piece which are symmetrically arranged along an intermediate bus bar in space and polarity, wherein one electrode of the first battery piece and one electrode of the second battery piece are connected to the intermediate bus bar to form a connection point A, the other electrode of the first battery piece and the other electrode of the second battery piece are connected through a first jumper bus bar to enable the first battery piece and the second battery piece to be connected in parallel, the first jumper bus bar and the intermediate bus bar are provided with a connection point B, and a first diode for protection is connected in series between the connection point A and the connection point B;

the space and the polarity of the third battery piece and the fourth battery piece are symmetrically arranged along the middle bus bar, one electrode of the third battery piece and one electrode of the fourth battery piece are connected to the middle bus bar to form a connection point C, the other electrodes are connected in parallel through the first jumper bus bar, a second diode for protection is connected in series between the connection point B and the connection point C, the first diode and the second diode are arranged on two sides of the first jumper bus bar, and the distance between the first diode and the second diode is close enough to enable the first battery piece and the fourth battery piece to be installed to the first junction box together at the connection point B;

the space and the polarity of the fifth battery piece and the sixth battery piece are symmetrically arranged along the middle bus bar, one electrode of the fifth battery piece and one electrode of the sixth battery piece are connected to the middle bus bar to form a contact E, the other electrode of the fifth battery piece and the other electrode of the sixth battery piece are connected in parallel through a second jumper bus bar, the second jumper bus bar and the middle bus bar are provided with a contact D, a third diode for protection is connected between the contact D and the contact E in series, the third diode is installed to a second junction box at the contact D, the electrode of the first battery piece connected to the contact A is opposite to the electrode of the third battery piece connected to the contact C, and the electrode of the third battery piece connected to the contact C is the same as the electrode of the fifth battery piece connected to the contact E.

Further, the width of the intermediate bus bar region formed at the junction B and/or the junction D is not less than the width of the corresponding junction box.

Furthermore, at least two battery strings which are connected in parallel are arranged inside each battery piece, wherein the string spacing between the battery strings is 0.5-10 mm, and the piece spacing between the battery pieces is 0.5-2mm.

Furthermore, the upper surface of the first jumper bus bar and/or the second jumper bus bar is provided with a light reflecting structure for reflecting sunlight to the side cell pieces.

Furthermore, the light reflecting structure is a pyramid structure and/or a twill structure arranged on the upper surface.

Furthermore, the glass of the cell is ultra-white float glass, and a reflecting structure for reflecting sunlight to the cell is arranged on the ultra-white float glass.

Further, the reflection structure is a glaze layer coated on the ultra-white float glass or a reflection film attached to the ultra-white float glass.

Further, the reflection of light pad pasting is including the at least three-layer of range upon range of each other, and wherein the upper strata material is AI, and the intermediate level material is PET, and the lower floor material is EVA, EPE or POE.

Furthermore, the jumper bus bar is led out vertically or obliquely along the middle bus bar.

Compared with the prior art, the utility model discloses photovoltaic module's arrangement structure cuts quantity with the circuit through cutting the battery piece and is greater than or equal to 2 pieces to through optimizing the internal circuit design, reach and increase subassembly power, reduce terminal box quantity, reach and improve and shelter from the influence and shelter from the purpose of partial hot spot reliability.

Drawings

Fig. 1 shows the layout design of the photovoltaic module of the present invention.

Fig. 2 shows the internal circuit structure design of the photovoltaic module of the present invention.

Fig. 3 shows the current flowing direction of the photovoltaic module circuit design of the present invention.

Fig. 4 shows a structural relationship between the junction box, the bus bar, and the battery cell at B in fig. 1 (i.e., at the junction B).

FIG. 5 illustrates a pyramidal light reflecting structure.

FIG. 6 illustrates a diagonal reflective structure.

FIG. 7 illustrates a layered construction of a retroreflective sheeting.

Detailed Description

The technical solution of the present invention will be further explained with reference to the accompanying drawings and specific embodiments.

The photovoltaic module of the present embodiment is designed as shown in fig. 1, and comprises an intermediate bus bar 1, a jumper bus bar 2, and six photovoltaic cells 31-36.

The internal circuit structure design of the photovoltaic module is shown in fig. 2, wherein each cell slice is composed of two cell strings connected in parallel, each cell string is composed of a plurality of cells connected in series, in the photovoltaic module, the upper and lower cell slices (such as 31 and 32, 33 and 34,35 and 36) are symmetrical structures arranged along the middle bus bar 1 as a symmetry axis, including space symmetry and cell polarity symmetry, because the upper and lower cell slices (such as 31 and 32) form a 4-string cell string-parallel structure, a 4-segment circuit design is formed to satisfy current conditions, and the

cell slices

31, 33 and 35 form a series structure to satisfy voltage conditions.

In fig. 2, one electrode of the first cell 31 and the second cell 32 is connected to the intermediate bus bar forming contact a. This embodiment is the negative pole with this electrode's selection for it is schematic in this embodiment for photovoltaic module is whole to be left negative right positive, certainly also can select for use to be anodal, makes photovoltaic module whole be right negative left positive. For ease of understanding, the following schematic describes the overall circuit with this electrode selected as the negative electrode.

As shown in fig. 2, in this schematic description, the negative electrodes of the first cell piece 31 and the second cell piece 32 are connected to the intermediate bus bar forming contact a, the positive electrodes of the first cell piece 31 and the second cell piece 32 face away from each other, and the two positive electrodes are connected via the first jumper bus bar 21 so that the first cell piece 31 and the second cell piece 32 are connected in parallel. In terms of space design, the first jumper bus bar 21 can be vertically led out from the horizontally arranged middle bus bar 1, so that the whole assembly is in a rectangular structure, or the first jumper bus bar is obliquely led out from the middle bus bar 1 to enable the assembly to form a quadrilateral or an opposite-type structure. The first jumper bus bar 21 is connected to the intermediate bus bar 1 and has a contact B, and a first diode 41 is connected in series between the contact a and the contact B as protection.

Similarly, the anodes of the third battery piece 33 and the fourth battery piece 34 are connected to the intermediate bus bar 1 to form a contact C, the cathodes are connected together through the first jumper bus bar 21 to realize parallel connection, and a second diode 42 for protection is connected in series between the contact B and the contact C. This design has two advantages, on one hand, since the electrode of the first cell 31 connected to the junction a and the electrode of the third cell 33 connected to the junction C have opposite polarities, and are connected in series, since the first jumper bus bar 21 is shared by the cells 31 and 33, the current flows in the direction shown in fig. 3 after series connection, wherein the current path at the ellipse of the dotted line is optimized (the length of the current path from 31 to 33 is minimized), so that the overall current path is shorter, and the purpose of reducing electrical loss is achieved; on the other hand, because 31, 33 share first jumper busbar 21, under this kind of structure, first diode 41 and second diode 42 can accomplish to locate first jumper busbar 21 both sides, and both distances can accomplish closely enough to install 41, 42 to same terminal box jointly in junction B department, as shown in fig. 4 terminal box 5, so can save a terminal box, because the terminal box can shelter from the battery piece at photovoltaic power generation, influence shelters from some hot spot reliability, so after omitting a terminal box, photovoltaic module's reliability can obtain promoting, also promoted the subassembly power simultaneously.

Similarly, referring to fig. 2, the positive electrodes of the fifth and

sixth battery pieces

35 and 36 are connected to the intermediate bus bar forming contact E, the negative electrodes are connected in parallel via the second jumper bus bar 22, and the second jumper bus bar 22 and the intermediate bus bar 1 have contact D. And a third diode 33 is connected between the contact D and the contact E in series, and the third diode 33 is installed to the second junction box at the contact D. Thus, the electrode of the third cell 33 connected to the contact C and the electrode of the fifth cell 35 connected to the contact E have the same polarity, and the electrodes 33 and 35 are connected in series due to the presence of the second jumper bus bar 22.

In this embodiment, the cell sheets use high-efficiency cells (the length and the width of the cell sheets both satisfy 166-230mm, the number of main grid lines is more than 5), such as TOPCon, HJT, IBC, PERC, and the like, and since the first cell sheet, the third cell sheet, and the fifth cell sheet are electrically connected to form a series structure, the voltage of the three is superposed to make the whole photovoltaic module satisfy the voltage condition.

According to the embodiment, the battery pieces are cut, the number of the cut battery pieces is larger than or equal to 2, the power of the assembly is increased by optimizing the design of an internal circuit, the number of the junction boxes is reduced, and the purpose of improving the reliability of shielding the hot spots of the shielded part due to shielding influence is achieved.

As an improvement scheme, the width of an intermediate confluence area formed at the joint B and the joint D is not less than that of a corresponding junction box, and the existing junction box is prevented from shielding the battery pieces as much as possible through the width setting, so that the reliability is further improved. Preferably, for two strings (or more strings of battery cells, of course) arranged inside each battery cell, the string pitch between the battery strings is arranged to be 0.5 to 10mm, and the cell pitch between the battery cells is arranged to be 0.5 to 2mm, so that magnetic interference between strings and between cells is reduced, and the reliability of the assembly is further improved. Furthermore, the diameter of the welding strip is within the range of 0.15-0.40mm.

As another improvement, in terms of increasing the power, the upper surfaces of the first jumper bus bar 21 and the second jumper bus bar 22 may be provided with a light reflecting structure for reflecting sunlight to the side cell pieces. The light reflecting structure is a pyramid structure 61 shown in fig. 5 and/or a twill structure 52 shown in fig. 6, which are disposed on the upper surface, so as to improve the light utilization rate.

Furthermore, the glass provided with the cell is ultra-white float glass, and a reflecting structure for reflecting sunlight to the cell is arranged on the ultra-white float glass. The reflection structure is a glaze layer coated on the ultra-white float glass or a reflection sticking film attached to the ultra-white float glass. Among them, the enamel layer can increase the power and has low cost, but has poor load-bearing capacity (the enamel layer needs heating, which affects the load-bearing capacity of the glass); the light-reflecting adhesive film is adhered, so that the light utilization rate can be improved, the power is further improved, heating is not needed, the adhesive film can be adhered, the load capacity of glass cannot be influenced, and the cost is slightly high. Fig. 7 shows the lamellar structure of the reflective film, in this embodiment, the reflective film comprises at least three layers stacked on each other, wherein the material of the upper layer 71 is AI, the material of the middle layer 72 is PET, and the material of the lower layer 73 is EVA, EPE or POE, so as to achieve the enhanced reflective effect and further improve the power of the module.

In this embodiment, any one or two of EVA, EPE, and POE are used as the encapsulating material of the photovoltaic module.

This embodiment is through evenly cutting the battery piece, cuts quantity and is greater than or equal to 2 to through optimizing the internal circuit design, use the wire jumper busbar that has the reflection of light effect (busbar sectional area upper surface is pyramid/twill design), and wire jumper busbar is the vertical direction with middle busbar and draws, and middle confluence region > designs such as terminal box width, and then can reach increase subassembly power and reliability.

The above embodiments are only some preferred embodiments of the present invention, and based on the technical solution of the present invention and the related teachings of the above embodiments, those skilled in the art may make various alternative modifications and combinations of the above embodiments within the scope of the present invention.

Claims

1. A multi-slice photovoltaic module, comprising:

an intermediate bus bar;

2. A multi-slice photovoltaic module according to claim 1 wherein: the width of the intermediate bus bar region formed at the junction B and/or the junction D is not less than the width of the corresponding junction box.

3. A multi-tile photovoltaic module according to claim 2, wherein: at least two battery strings which are connected in parallel are arranged in each battery piece, wherein the string spacing between the battery strings is 0.5-10 mm, and the piece spacing between the battery pieces is 0.5-2mm.

4. A multi-slice photovoltaic module according to claim 1 wherein: the upper surface of the first jumper wire bus bar and/or the second jumper wire bus bar is/are provided with a light reflecting structure for reflecting sunlight to the side battery piece.

5. A multi-slice photovoltaic module according to claim 4 wherein: the light reflecting structure is a pyramid structure and/or a twill structure arranged on the upper surface.

6. A multi-slice photovoltaic module according to claim 1, 4 or 5 wherein: the glass of the cell is ultra-white float glass, and a reflecting structure for reflecting sunlight to the cell is arranged on the ultra-white float glass.

7. A multi-tile photovoltaic module according to claim 6, wherein: the reflection structure is a glaze layer coated on the ultra-white float glass or a reflection sticking film attached to the ultra-white float glass.

8. A multi-slice photovoltaic module according to claim 7 wherein: the reflecting film comprises at least three layers which are stacked mutually, wherein the upper layer is made of AI, the middle layer is made of PET, and the lower layer is made of EVA, EPE or POE.

9. A multi-tile photovoltaic module according to claim 1, wherein: the jumper bus bar is led out vertically or obliquely along the middle bus bar.