CN218385244U

CN218385244U - IBC photovoltaic module flexible interconnection structure

Info

Publication number: CN218385244U
Application number: CN202222669760.4U
Authority: CN
Inventors: 刘志; 李丽娟; 于学春; 陈来鹏
Original assignee: Shanren Zhejiang New Material Technology Co ltd
Current assignee: Shanren Zhejiang New Material Technology Co ltd
Priority date: 2022-10-11
Filing date: 2022-10-11
Publication date: 2023-01-24
Anticipated expiration: 2032-10-11

Abstract

The utility model discloses a flexible interconnection structure of IBC photovoltaic module, including the connection piece of connection between adjacent IBC battery piece, the upper surface printing of connection piece has the conducting wire, and the conducting wire adopts the printing of tensile conductive silver thick liquid, and the both ends of connection piece bond respectively on adjacent IBC battery piece; the positive electrode main grid and the negative electrode main grid on the adjacent IBC battery pieces are electrically connected through a conductive circuit on the surface of the connecting piece; the utility model discloses a flexible interconnect structure of IBC photovoltaic module has replaced the tradition to adopt the technology of the adjacent IBC battery piece of conductive metal welding, and the connection piece of the flexible material that PI material or other high temperature resistant weather resistance are good bonds between adjacent IBC battery piece as the substrate, and the conducting wire that adopts the conductive silver thick liquid printing of stretching simultaneously is used for switching on adjacent IBC battery piece, and the elasticity and the fatigue nature of conducting wire and substrate after the printing are also fine, and flexible interconnect structure can be crooked and can not fracture.

Description

IBC photovoltaic module flexible interconnection structure

Technical Field

The utility model relates to a IBC photovoltaic field specifically is a flexible interconnect structure of IBC photovoltaic module.

Background

The IBC cell technology is a back-junction back-contact solar cell structure, and positive and negative metal electrodes of the IBC cell structure are arranged on a backlight surface of a cell in an interdigital manner. The back surface is an interdigital P + emitter and an N + + back surface field BSF which are formed in a diffusion mode, the emitter can form a P-N junction with an N-type silicon substrate to effectively shunt current carriers, and the N + back surface field region can form a high-low junction with N-type silicon to enhance the separation capability of the current carriers, so that the method is a core technology of the IBC battery; the front and the back surfaces are made of SiO ² /SiN ^x The laminated film is used as a passivation film and used for inhibiting carrier recombination on the back surface of the IBC solar cell; the front surface is often provided with an antireflection layer, so that the power generation efficiency is improved; the metal contact parts are all arranged in an interdigital shape at the contact areas of the positive electrode and the negative electrode on the back surface.

For example, patent application No. CN202122371860.4 discloses a bus bar for IBC cell sheet soldering, a solar cell string and a module, the bus bar for IBC cell sheet soldering includes: a main body; the bulges are respectively arranged on the two sides of the main body and used for a plurality of welding parts welded with the positive electrode main grid or the negative electrode main grid of the IBC battery piece, the welding parts are sequentially arranged at intervals along the length direction of the main body, and a hollow groove is formed in the middle position of each welding part.

The bus bar can greatly reduce the welding area with the IBC battery plate, and reduce the probability of the breakage of the IBC battery plate caused by the stress generated by welding; however, the process cannot be separated from the welding process, the welding difficulty is high, and the bus bar is generally a tinned aluminum strip which can be gradually broken under the action of cyclic strain.

Therefore, there is a need for an improved structure that overcomes the above-mentioned deficiencies.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a flexible interconnect structure of IBC photovoltaic module to solve the problem that proposes among the above-mentioned background art.

In order to achieve the above object, the utility model provides a following technical scheme:

the flexible interconnection structure of the IBC photovoltaic module comprises connecting sheets connected between adjacent IBC battery pieces, wherein conductive circuits are printed on the upper surfaces of the connecting sheets and printed by stretchable conductive silver paste, and two ends of each connecting sheet are respectively bonded on the adjacent IBC battery pieces; the positive electrode main grid and the negative electrode main grid on the adjacent IBC battery piece are electrically connected through a conducting circuit on the surface of the connecting piece; the connecting sheet is made of PI material or other flexible materials with good high temperature resistance and weather resistance.

Furthermore, the lower surface of the connecting sheet is printed with a conductive circuit, the conductive circuit is printed by stretchable conductive silver paste, and two ends of the connecting sheet are respectively bonded to the adjacent IBC battery sheets; conductive through holes are also formed at two ends of the connecting sheet.

Furthermore, the conductive through holes are arranged corresponding to the positive electrode main grid and the negative electrode main grid on the adjacent IBC battery piece.

Further, the conductive through hole is filled with conductive silver paste, and the conductive silver paste conducts the positive electrode main grid or the negative electrode main grid with the conductive circuit.

Furthermore, the upper surface of the connecting sheet is covered with a protective sheet, the protective sheet is made of the same material as the connecting sheet, and the protective sheet and the connecting sheet are mutually bonded.

Furthermore, the positions of the two ends of the connecting sheet and the connecting positions of the main grids of the positive electrode or the negative electrode on the IBC cell sheet are not provided with protective sheets.

Compared with the prior art, the beneficial effects of the utility model are that: the utility model discloses a flexible interconnect structure of IBC photovoltaic module has replaced the tradition and has adopted the technology of the adjacent IBC battery piece of conductive metal welding, and the connecting piece of the flexible material that PI material or other high temperature resistant weatherability are good bonds between adjacent IBC battery piece as the substrate, adopts the conducting wire that can stretch the conductive silver thick liquid printing to be used for switching on adjacent IBC battery piece simultaneously, and the elasticity and the fatigue nature of conducting wire and substrate after the printing are also very good, and flexible interconnect structure can be crooked and can not fracture; the method is suitable for the situation that the height difference exists between the adjacent IBC battery plates, and the connecting structure connected between the adjacent IBC battery plates needs to be bent.

Drawings

Fig. 1 is a schematic structural diagram of an IBC photovoltaic module flexible interconnection structure connected between IBC cells.

Fig. 2 is a schematic view of an IBC photovoltaic module flexible interconnect structure connected in flexion between IBC cells.

Fig. 3 is a schematic view of an IBC photovoltaic module flexible interconnect structure connected at another angle during bending between IBC cells.

Fig. 4 is a schematic structural diagram of a flexible interconnection structure of an IBC photovoltaic module according to an embodiment.

Fig. 5 is a schematic structural diagram of a flexible interconnection structure of an IBC photovoltaic module according to a second embodiment.

Fig. 6 is a schematic structural diagram of a flexible interconnection structure of an IBC photovoltaic module according to a third embodiment.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the drawings in the embodiments of the present invention are combined below to clearly and completely describe the technical solutions in the embodiments of the present invention. It is to be understood that the embodiments described are only some of the embodiments of the present invention, and not all of them. The components of the embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments of the present invention, all other embodiments obtained by a person skilled in the art without making creative efforts belong to the protection scope of the present invention.

In a first embodiment, referring to fig. 1-4, an IBC photovoltaic module flexible interconnection structure includes a connecting sheet 2 connected between adjacent IBC cells 1,

conductive circuits 3 are printed on the upper surface of the connecting sheet 2, the conductive circuits 3 are printed by stretchable conductive silver paste, and two ends of the connecting sheet 2 are respectively bonded to the adjacent IBC battery pieces 1; the positive electrode main grid and the negative electrode main grid on the adjacent IBC battery plate 1 are electrically connected through the conductive circuit 3 on the surface of the connecting plate 2;

specifically, one end of the conductive circuit 3 is electrically connected with a main positive electrode grid on one IBC cell 1, and the other end of the conductive circuit is electrically connected with a main negative electrode grid on the other IBC cell 1;

the connecting sheet 2 is made of PI material or other flexible materials with good high temperature resistance and weather resistance;

the PI material is one of organic polymer materials with the best comprehensive performance. The high-temperature resistant insulating material has high temperature resistance of more than 400 ℃, long-term use temperature range of-200-300 ℃, no obvious melting point at part, high insulating property, dielectric constant of 4.0 at 103 Hz and dielectric loss of only 0.004-0.007, and belongs to F-H level insulation. As engineering plastics, the elastic modulus is usually 3-4GPa, and the fiber can reach 200GPa;

other flexible materials with good high temperature resistance and weather resistance can be PET materials, and the heat distortion temperature and the long-term use temperature of the PET materials are the highest in thermoplastic universal engineering plastics; the elastic modulus reaches 4000MPa, the creep resistance and the fatigue resistance are good, the surface hardness is high, and the mechanical property is similar to that of thermosetting plastics.

When this scheme was used, directly bond connection piece 2 between adjacent IBC battery piece 1 through glue can.

Second embodiment, referring to fig. 1-3 and 5, an IBC photovoltaic module flexible interconnect structure includes a connecting sheet 2 connected between adjacent IBC cells 1,

the lower surface of the connecting sheet 2 is printed with a conductive circuit 3, the conductive circuit 3 is printed by adopting stretchable conductive silver paste, and two ends of the connecting sheet 2 are respectively bonded on the adjacent IBC battery pieces 1; two ends of the connecting sheet 2 are also provided with conductive through holes 4; the conductive through holes 4 are arranged corresponding to the positive electrode main grid and the negative electrode main grid on the adjacent IBC battery piece 1;

when the scheme is used, when the connecting sheet 2 is connected with the IBC battery sheets 1, the adjacent IBC battery sheets 1 are not conducted, and then conductive silver paste is injected into the conductive through holes 4, so that the positive electrode main grid or the negative electrode main grid can be conducted with the conductive circuit 3;

other flexible materials with good high temperature resistance and weather resistance can be PET materials, and the heat distortion temperature and the long-term use temperature of the PET materials are the highest in the thermoplastic universal engineering plastics; the elastic modulus reaches 4000MPa, the creep resistance and the fatigue resistance are good, the surface hardness is high, and the mechanical property is similar to that of thermosetting plastics.

In a third embodiment, referring to fig. 1-3 and 6, an IBC photovoltaic module flexible interconnection structure includes a connecting sheet 2 connected between adjacent IBC cells 1,

the upper surface of the connecting sheet 2 is printed with a conductive circuit 3, the conductive circuit 3 is printed by stretchable conductive silver paste, and two ends of the connecting sheet 2 are respectively bonded to the adjacent IBC battery pieces 1; the positive electrode main grid and the negative electrode main grid on the adjacent IBC battery plate 1 are electrically connected through the conductive circuit 3 on the surface of the connecting plate 2;

the upper surface of connecting piece 2 still covered and have protection piece 5, protection piece 5 is for being the same material with connecting piece 2, and protection piece 5 bonds each other with connecting piece 2, does not have protection piece 5 in the position of the both ends of connecting piece 2 and positive electrode main grid or negative electrode main grid junction on IBC cell 1 simultaneously, protection piece 5 can play protection and the guard action to conducting wire 3, prevents oxidation or wearing and tearing.

In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "left", "right", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, or orientations or positional relationships that are conventionally placed when the products of the present invention are used, or orientations or positional relationships that are conventionally understood by those skilled in the art, and are only for convenience of description of the present invention and simplification of description, but do not indicate or imply that the designated devices or elements must have a specific orientation, be configured and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used merely to distinguish one description from another, and are not to be construed as indicating or implying relative importance. In the description of the present invention, it should be further noted that, unless otherwise explicitly stated or limited, the terms "disposed" and "connected" should be broadly construed, for example, "connected" may be a fixed connection, a detachable connection, or an integral connection; can be mechanically or electrically connected; the connection may be direct or indirect through an intermediate medium, and the connection may be internal to the two elements. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

Claims

1. The flexible interconnection structure of the IBC photovoltaic module comprises connecting sheets connected between adjacent IBC battery pieces, and is characterized in that conductive circuits are printed on the upper surfaces of the connecting sheets, the conductive circuits are printed by stretchable conductive silver paste, and two ends of each connecting sheet are respectively bonded on the adjacent IBC battery pieces; the positive electrode main grid and the negative electrode main grid on the adjacent IBC battery piece are electrically connected through a conducting circuit on the surface of the connecting piece; the connecting sheet is made of PI materials.

2. The IBC photovoltaic module flexible interconnection structure of claim 1, wherein the lower surface of the connecting sheet is printed with conductive circuits printed with stretchable conductive silver paste, and two ends of the connecting sheet are respectively bonded to adjacent IBC battery sheets; conductive through holes are also formed at two ends of the connecting sheet.

3. The IBC photovoltaic module flexible interconnection structure of claim 2, wherein the conductive through holes are arranged corresponding to the positive electrode main grid and the negative electrode main grid on the adjacent IBC cell slice.

4. The IBC photovoltaic module flexible interconnection structure of claim 3, wherein the conductive via is filled with conductive silver paste, and the conductive silver paste connects the positive electrode main gate or the negative electrode main gate with the conductive circuit.

5. The IBC photovoltaic module flexible interconnection structure of claim 1, wherein the upper surface of the connecting sheet is further covered with a protection sheet, the protection sheet is made of the same material as the connecting sheet, and the protection sheet and the connecting sheet are bonded to each other.

6. The IBC photovoltaic module flexible interconnection structure of claim 5, wherein there is no protection sheet at the connection position of the two ends of the connection sheet and the main grid of the positive electrode or the main grid of the negative electrode on the IBC cell sheet.