CN209785953U - Photovoltaic conductive backboard and solar cell module - Google Patents

Abstract

The utility model provides a photovoltaic conductive backboard, solar module, this photovoltaic conductive backboard includes: the plate body is provided with a through hole; the first conductive structures are arranged at two ends of the inner side of the plate body and extend along the transverse direction of the plate body, and the first conductive structures are used for being connected and conducted with electrodes at two ends of the battery string; the second conductive structure is arranged on the inner side of the plate body and vertically extends along the plate body, one end of the second conductive structure is communicated with the first conductive structure, and the other end of the second conductive structure penetrates through the through hole and extends to the other side of the plate body; and the adhesive film layer covers the inner side of the plate body so as to clamp the first conductive structure and the second conductive structure between the adhesive film layer and the plate body, and an electrode connecting opening is arranged at a position on the adhesive film layer corresponding to the first conductive structure, so that electrodes at two ends of the battery string pass through the electrode connecting opening to be connected and conducted with the first conductive structure.

Description

photovoltaic conductive backboard and solar cell module

Technical Field

The utility model relates to a photovoltaic cell technical field, concretely relates to photovoltaic conductive backboard, solar module.

Background

The laminated module is an important development route of a high-efficiency solar cell module in the visible future, and is characterized in that a traditional whole cell is cut into a plurality of small pieces (1/4,1/5,1/6 and the like, which can be equally or unequally divided), then conductive adhesive is coated on electrodes of the cell, the edges of adjacent cells are arranged in an up-and-down overlapping mode, and the cell pieces are connected together to form a cell string after the conductive adhesive is cured. Doing so can use the conducting resin to replace traditional metal solder strip, and flexible conducting resin connects and can reduce stress on the one hand, and on the other hand zero clearance connection mode can improve the utilization ratio of subassembly area, promotes subassembly efficiency then, produces more electric power output in effective unit area.

In order to avoid the hot spot risk caused by partial shielding in the operation of the assembly, a plurality of battery strings are usually combined to form a battery string group in one assembly, and bypass diodes are connected in parallel on the battery strings to solve the problems. In combination with the actual use condition of the assembly, 2-4 bypass diodes are usually connected in parallel according to the number of the batteries in the assembly.

The existing companies, represented by Sun power in the united states, add diodes and connect battery strings in such a way that metal bus bar lead wires are connected at the ends of the battery strings, and then the lead wires serve as electrodes or are connected with diodes.

However, the disadvantages of this approach include: in order to improve the utilization rate of the area, the metal bus bar is hidden at the back of the battery as much as possible, and the bus bar is generally connected in parallel to one end of the bypass diode in a mode of assembly back jumper wires, that is, 4 to 8 jumper wires in the assembly are generally connected in parallel to 2 to 4 bypass diodes, so that the operation complexity is increased, the fragment rate is high, and the automation degree is low.

SUMMERY OF THE UTILITY MODEL

In view of this, the utility model aims at providing a photovoltaic conductive back plate saves the busbar design, realizes circuit connection's convenience in the subassembly, can reduce the piece rate simultaneously, improve the degree of automation of subassembly, increases the productivity of subassembly.

another object of the present invention is to provide a solar energy device with the above photovoltaic conductive back plate

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

According to the utility model discloses electrically conductive backplate of photovoltaic of first aspect embodiment, include: the plate body is provided with a through hole;

The first conductive structures are arranged at two ends of the inner side of the plate body and extend along the transverse direction of the plate body, and the first conductive structures are used for being connected and conducted with electrodes at two ends of the battery string;

The second conductive structure is arranged on the inner side of the plate body and vertically extends along the plate body, one end of the second conductive structure is communicated with the first conductive structure, and the other end of the second conductive structure penetrates through the through hole and extends to the other side of the plate body; and

the adhesive film layer covers the inner side of the plate body so as to clamp the first conductive structure and the second conductive structure between the adhesive film layer and the plate body, and an electrode connecting opening is formed in the position, corresponding to the first conductive structure, of the adhesive film layer, so that electrodes at two ends of the battery string can penetrate through the electrode connecting opening to be connected and conducted with the first conductive structure.

Preferably, the first conductive structure is formed by sequentially laminating a rubber film layer and a conductive layer from the surface of the board body to the rubber film layer.

Further, the first conductive structure further comprises an insulating layer, and the insulating layer is arranged between the conductive layer and the adhesive film layer.

Further, the electrode connecting openings are integrally or intermittently arranged, and the electrode connecting openings extend downwards to the conductive layer.

further, the second conductive structure is followed plate body surface begins to move towards the glued membrane layer has stacked gradually doubling rete, conducting layer and insulating layer, the second conductive structure doubling rete, conducting layer and insulating layer respectively with the doubling rete, conducting layer and the insulating layer one-to-one of first conductive structure is connected, the second conductive structure the other end be equipped with the conducting layer is connected the output electrode who switches on, just the output electrode passes the through-hole and extends to the opposite side of plate body.

Further, the output electrode is integrally formed with the conductive layer in the second conductive structure.

preferably, a third conductive structure is further arranged between the glue film layer and the plate body, the third conductive structure is located in the middle of the inner side of the plate body and extends along the transverse direction of the plate body, the third conductive structure is formed by sequentially stacking the glue film layer, the conductive layer and the insulating layer which are respectively connected with the glue film layer, the conductive layer and the insulating layer of the first conductive structure in a one-to-one correspondence manner from inside to outside on the surface of the plate body, two rows of electrode connecting openings are also arranged at positions corresponding to the edges of two vertical sides of the glue film layer and the third conductive structure, each row comprises an integral or discontinuous plurality of spaced electrode connecting openings, and the electrode connecting openings extend downwards to the conductive layer.

Furthermore, grooves are respectively formed in the plate body at positions corresponding to the first conductive structure, the second conductive structure and the third conductive structure, and the first conductive structure, the second conductive structure and the third conductive structure are respectively laid in the grooves.

According to the utility model discloses solar module of second aspect embodiment, including battery cluster and above-mentioned any embodiment the electrically conductive backplate of photovoltaic, wherein the electrode at the both ends of battery cluster with electrically conductive structural connection switches on in the electrically conductive backplate of photovoltaic.

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

According to the utility model discloses electrically conductive backplate of photovoltaic when carrying out solar module's equipment, can replace traditional metal bus bar + encapsulation notacoria + photovoltaic backplate. Namely, after the solar cell module is assembled and the cell strings are arranged, the photovoltaic conductive back plate is directly placed on the cell strings, the electrodes of the photovoltaic conductive back plate and the cell strings are connected and conducted according to the corresponding design by utilizing the electrode connection openings on the photovoltaic conductive back plate, no welding operation is needed on the back of the last cell of the cell strings, and meanwhile, as the photovoltaic conductive back plate is provided with the adhesive film layer, the operations of packaging the adhesive film on the back of the cover, various insulating strips, the back of the cover and the like are omitted, so that the fragment rate is greatly reduced; and provides the possibility of implementation of the whole process automation.

Drawings

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

fig. 2 is a schematic diagram of a battery piece before and after cutting in embodiment 1 of the present invention, wherein (a): front a before cutting, (b): front a back side cut, (c): cut a front side, (d): cutting the back surface a;

Fig. 3 is a schematic diagram of the series connection of the battery cells according to embodiment 1 of the present invention;

Fig. 4 is a schematic circuit diagram of a solar cell module according to embodiment 1 of the present invention;

FIG. 5 is a schematic view of a photovoltaic conductive backsheet corresponding to the circuit design of FIG. 4;

FIG. 6 is an enlarged view of the portion indicated by I in FIG. 5;

FIG. 7 is a schematic sectional view taken along the line A-A in FIG. 6;

FIG. 8 is an enlarged view of II of FIG. 5;

FIG. 9 is a schematic sectional view taken along line A-A of FIG. 8;

FIG. 10 is an enlarged view of the portion indicated by III in FIG. 5;

FIG. 11 is a schematic cross-sectional view taken along line B-B of FIG. 10;

fig. 12 is a schematic circuit diagram of a solar cell module according to embodiment 2 of the present invention;

FIG. 13 is a schematic view of a photovoltaic conductive backsheet corresponding to the circuit design of FIG. 12;

Fig. 14 is a schematic diagram of a battery full sheet in embodiment 3 of the present invention before and after cutting, wherein (a): front a' before cutting, (b): front a' back side before cutting, (c): a' front surface after slicing, (d): cutting the back surface a' after slicing;

fig. 15 is a schematic diagram of a series connection of battery strings according to embodiment 3 of the present invention;

fig. 16 is a schematic view of a photovoltaic conductive backplane according to embodiment 3 of the present invention;

FIG. 17 is an enlarged view of I' of FIG. 16;

FIG. 18 is a schematic sectional view taken along line A-A of FIG. 17;

Fig. 19 is a schematic sectional view taken along the direction B-B in fig. 17.

Reference numerals:

101 a glass cover plate; 201 packaging adhesive film; 301 battery string; 401 a photovoltaic conductive backsheet;

1, a plate body; 2 a first conductive structure; 3 a second conductive structure; 100 a third conductive structure; 4, a glue film layer; 5 an output electrode; 6 laminating a film layer; 7 a conductive layer; 8 an insulating layer; 9 electrode connection openings; 9' electrode connection openings of the photovoltaic conductive backsheet according to example 3;

10 front main grid of the battery piece a according to the embodiment 1 of the present invention; 11 according to the utility model discloses the back main grid of 1 battery piece a; 12 electrode lead-out connecting pieces;

13 front main grid of the battery piece a' according to the utility model in embodiment 3; 14 according to the utility model discloses in embodiment 3 back main grid that the back of battery piece a' is close to the edge; 15 according to the utility model discloses the back of battery piece a' is close to the back main grid of intermediate position in embodiment 3.

Detailed Description

In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the drawings of the embodiments of the present invention are combined below to clearly and completely describe the technical solution of 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. All other embodiments, which can be derived from the description of the embodiments of the present invention by a person skilled in the art, are within the scope of the present invention.

Unless otherwise defined, technical or scientific terms used herein shall have the ordinary meaning as understood by those of ordinary skill in the art to which the invention belongs. The use of "first," "second," and similar terms in the description herein do not denote any order, quantity, or importance, but rather the terms are used to distinguish one element from another. Also, the use of the terms "a" or "an" and the like do not denote a limitation of quantity, but rather denote the presence of at least one. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect.

In the present specification, for convenience of description, the "battery string" and the "battery string group" are collectively referred to as a "battery string".

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 includes a glass cover plate 101, an encapsulant film 201, a cell string 301, and a photovoltaic conductive back plate 401 in order from a light receiving surface to a backlight surface.

the photovoltaic conductive backplane 401 is a backplane with a conductive function, and a circuit structure of the photovoltaic conductive backplane 401 matched with the photovoltaic conductive backplane can be correspondingly designed according to the arrangement mode of the cell strings 301 and the connection mode of the cell strings and the bypass diodes, so that the cell strings 301 are communicated with the conductive structure on the photovoltaic conductive backplane and are connected to the bypass diodes.

According to the utility model discloses electrically conductive backplate 401 of photovoltaic, as shown in fig. 5 to 11, include: the board comprises a board body 1, a first conductive structure 2, a second conductive structure 3 and an adhesive film layer 4.

The plate body 1 is provided with a through hole (not shown).

The first conductive structures 2 are disposed at both ends of the inner side of the plate body 1 (i.e., the side close to the cell string 301) and extend in the lateral direction of the plate body 1 (the left-right direction as viewed in fig. 5). The first conductive structure 2 is used to be connected and conducted with electrodes (for example, the back main grid 11 in embodiment 1 shown in fig. 2) at both ends of the cell string 301.

The second conductive structure 3 is disposed on the inner side of the board body 1 and extends vertically (in the up-down direction shown in fig. 5) along the board body 1. One end of the second conductive structure 3 is connected to the first conductive structure 2, and the other end of the second conductive structure passes through the through hole and extends to the other side of the board body 1.

the adhesive film layer 4 covers the inner side of the board body 1 to clamp the first conductive structure 2 and the second conductive structure 3 between the adhesive film layer 4 and the board body 1. An electrode connecting opening 9 is arranged at a position on the adhesive film layer 4 corresponding to the first conductive structure 1, so that electrodes at two ends of the battery string 301 pass through the electrode connecting opening 9 to be connected and conducted with the first conductive structure 2. The main function of the adhesive layer 4 is to bond the photovoltaic conductive backsheet 401 to a cell string described later. In addition, the secondary function is to clamp the first conductive structure 2 and the second conductive structure 3 together with the plate body 1.

According to the embodiment of the present invention, the photovoltaic conductive backplane 401 can replace the conventional metal bus bar by providing the first conductive structure 2, and directly connect and conduct the photovoltaic conductive backplane 401 and the battery string 301, and further, by providing the second conductive structure 3, the electric energy collected by the first conductive structure 2 from the battery string 301 is directly output to the outside of the board body 1, and no welding operation is required at the back of the last battery of the battery string 301; furthermore, as the photovoltaic conductive back plate 401 is provided with the adhesive film layer 4, the operations of packaging an adhesive film on the back surface of the cover, various insulating strips, the cover back plate and the like are omitted, and the fragment rate is greatly reduced; and provides the possibility of implementation of the whole process automation.

According to some embodiments of the present invention, as shown in fig. 5-7, the first conductive structure 2 is sequentially stacked with a glue film layer 6 and a conductive layer 7 from the surface of the board body 1 to the glue film layer 4. The first conductive structure 2 and the second conductive structure 3 are adhered to the board body 1 by the adhesive film layer 6. Further, the first conductive structure 2 may further include an insulating layer 8, and the insulating layer 8 is disposed between the conductive layer 7 and the adhesive film layer 4. The insulating layer 8 serves to block the possibility of electrical conduction between the conductive layer 7 and the adhesive film layer 4, so that the first conductive structure 2 can be more stable and reliable.

Wherein, the electrode connecting opening 9 can be a plurality of continuous integral type (as shown in fig. 16-17) or discontinuous arrangement (as shown in fig. 5-7), and the electrode connecting opening 9 extends downwards to the conductive layer 7.

there is no particular limitation as to the form of the electrode connection opening 9, which is disposed correspondingly according to the rear electrodes of the battery string 301 to be fitted. For example, in embodiment 1, as shown in fig. 2, the back electrodes on the cell slices in the cell string 301 are discontinuous line segment-shaped back main grids 11, and thus the electrode connection openings 9 in the photovoltaic conductive backsheet 401 are also formed in a plurality of discontinuous arrangements so as to be respectively connected with the back main grids 11 in a one-to-one correspondence; when the rear main grid of the cell is a continuous straight line, or even in the case where the rear main grid is a discontinuous line segment-shaped rear main grid, the electrode connection openings 9 may be designed to be continuously integrated (as shown in fig. 16).

According to some embodiments of the present invention, as shown in fig. 8-9, the second conductive structure 3 is sequentially stacked with a glue film layer 6, a conductive layer 7, and an insulating layer 8 from the surface of the board body 1 toward the glue film layer 4. The adhesive film layer 6, the conductive layer 7 and the insulating layer 8 of the second conductive structure 3 are respectively connected with the adhesive film layer 6, the conductive layer 7 and the insulating layer 8 of the first conductive structure 2 in a one-to-one correspondence manner. The other end of the second conductive structure 3 (i.e. the end far away from the first conductive structure 2) is provided with a conductive layer 7 to connect with the conducted output electrode 5, and the output electrode 5 passes through the through hole and extends to the other side of the plate body 1. Therefore, the output electrode 5 is conducted with the conductive layer of the first conductive structure 2, and the electric energy collected by the first conductive structure is output through the output electrode 5, so that the structure is simple and reliable.

In addition, as an arrangement method of the first conductive structure 2 and the second conductive structure 3, the glue-sandwiched film layer 6, the conductive layer 7, and the insulating layer 8 may be coated (or printed) layer by layer according to a designed layout, in other words, the arrangement of the glue-sandwiched film layer 6 in the first conductive structure 2 and the glue-sandwiched film layer 6 in the second conductive structure 3 may be completed in the same step, and similarly, the conductive layer 7 and the insulating layer 8 are also the same.

further, the output electrode 5 and the conductive layer 7 in the second conductive structure 3 may be integrally formed.

according to some embodiments of the present invention, a third conductive structure 100 is further disposed between the adhesive film layer 4 and the plate body 1, and the third conductive structure 100 is located in the middle of the inner side of the plate body and transversely extends along the plate body 1. Similarly, the third conductive structure 100 is sequentially stacked with the adhesive film layer 6, the conductive layer 7 and the insulating layer 8 of the first conductive structure 2 from inside to outside, wherein the adhesive film layer 6, the conductive layer 7 and the insulating layer 8 are correspondingly connected with the adhesive film layer 6, the conductive layer 7 and the insulating layer 8 of the first conductive structure one by one. Two rows of electrode connecting openings 9 are also arranged at positions of the adhesive film layer 4 corresponding to two vertical side edges of the third conductive structure 100, each row includes an integral or discontinuous plurality of electrode connecting openings 9 arranged at intervals, and the electrode connecting openings 9 extend downwards to the conductive layer 7.

That is, when the solar cell module includes a plurality of cell strings 301, and the plurality of cell strings 301 are arranged in a plurality of rows, correspondingly, a plurality of rows of the third conductive structures 100 may be correspondingly disposed at the middle portion in the transverse direction of the photovoltaic conductive backsheet 401 so as to correspond to the cell strings 301 one to one, so that the electrodes at the two ends of the cell strings 301 are electrically connected to the electrode connection openings 9 one to one.

in order to keep the adhesive film layer 4 flat as a whole, grooves may be respectively formed in the plate body 1 at positions corresponding to the first conductive structure 2, the second conductive structure 3, and the third conductive structure 100, and the first conductive structure 2, the second conductive structure 3, and the third conductive structure 100 are respectively laid in the grooves.

According to the utility model discloses solar module uses above-mentioned photovoltaic conductive back plate 401, can make through following preparation method:

In step S1, the battery string 301 is provided. The battery string 301 has electrodes at both ends thereof.

Step S2, providing the photovoltaic conductive backsheet 401.

Step S3, spraying conductive glue on any one of the electrodes of the cell string 301 and/or the electrode connection opening 9 of the photovoltaic conductive backsheet 401;

Step S4, laying the glass cover plate 101, the packaging adhesive film 201, the battery string 301, and the conductive back plate in the order from bottom to top, and making the electrodes and the electrode connection openings 9 form conductive connections in a one-to-one correspondence;

Step S5, after EL testing and lamination processing, connecting a junction box between the output electrodes 5 of the photovoltaic conductive backsheet 401, and obtaining the solar cell module.

According to the above preparation method, by using the photovoltaic conductive back plate 401 according to the present invention, the operations of a cover back surface packaging adhesive film, various insulating strips, a cover back plate, and the like are omitted, and the fragment rate is greatly reduced; and provides the possibility of implementation of the whole process automation.

the present invention will be described in further detail with reference to specific examples.

Example 1

Fig. 1 is a schematic structural diagram of a solar cell module according to embodiment 1 of the present invention.

As shown in fig. 1, the shingled solar cell module provided in this embodiment includes, in order from bottom to top, a glass cover plate 101, an encapsulant film 201, a cell string 301, and a photovoltaic conductive backsheet 401.

each battery string 301 is formed by connecting a plurality of battery pieces a, and the front electrode of the first battery of the battery string 301 is connected with the electrode leading-out connecting piece, wherein the polarities of the front electrodes of the battery pieces a are consistent, and the polarities of the back electrodes of the battery pieces a are consistent.

In this embodiment, as shown in fig. 4, the battery string 301 is designed into three rows, and each row of battery string 301 is connected with a bypass diode.

Accordingly, as shown in fig. 5 to 7, the photovoltaic conductive backsheet 401 includes: the board comprises a board body 1 and a glue film layer 4, wherein a first conductive structure 2, a second conductive structure 3 and a third conductive structure 100 are clamped between the board body 1 and the glue film layer 4.

the first conductive structures 2 are disposed at two ends of the inner side of the board body 1 and extend along the transverse direction 1 of the board body.

the second conductive structure 3 is arranged on the inner side of the plate body 1 and vertically extends along the plate body 1, one end of the second conductive structure 3 is communicated with the first conductive structure 2, and the other end of the second conductive structure passes through the through hole and extends to the other side of the plate body 1.

The third conductive structure 100 is located in the middle of the inner side of the board body and extends along the board body 1 in the transverse direction.

the glue film layer 4 covers the inner side of the plate body 1 so as to clamp the first conductive structure 2 and the second conductive structure 3 between the glue film layer 4 and the plate body 1, and an electrode connecting opening 9 is arranged at a position on the glue film layer 4 corresponding to the first conductive structure 2, so that electrodes at two ends of the battery string 301 penetrate through the electrode connecting opening 9 to be connected and conducted with the first conductive structure.

As shown in fig. 5 to 9, each of the first conductive structure 2 and the second conductive structure 3 includes an interlayer film layer 6, a conductive layer 7, and an insulating layer 8, wherein the interlayer film layer 6 is bonded to the plate body 1 of the photovoltaic conductive backplane 401, and the insulating layer 8 is bonded to the adhesive film layer 4. An electrode connection opening 9 is provided in the adhesive film layer 4 through the insulating layer 8 to the conductive layer 7 for connection with an electrode of the battery string 301.

as shown in fig. 9, the second conductive structure 3 is provided with an output electrode 5 formed integrally with the conductive layer 7 for connecting an electrode lead of the solar cell module and a diode.

Similarly, as shown in fig. 10 and 11, the third conductive structure 100 is formed by sequentially laminating, from the inside to the outside, the adhesive film layer 6, the conductive layer 7, and the insulating layer 8, which are respectively connected to the adhesive film layer 6, the conductive layer 7, and the insulating layer 8 of the first conductive structure 2 in a one-to-one correspondence manner, from the surface of the board body 1. Two rows of electrode connecting openings 9 are also arranged at positions of the adhesive film layer 4 corresponding to two vertical side edges of the third conductive structure 100, each row includes an integral or discontinuous plurality of electrode connecting openings 9 arranged at intervals, and the electrode connecting openings 9 extend downwards to the conductive layer 7.

By the design, the bus bars welded with the battery string electrodes do not need to be arranged on the battery strings 301, the production efficiency can be improved at the assembly end, the fragment rate in the assembly production process is reduced, and the unit area power generation efficiency of the assembly can be improved on the basis of ensuring the assembly performance.

As shown in fig. 2, the battery piece a is cut from the whole battery a, and the plurality of cut battery pieces a have the same structure.

The electrode lead-out connector 12 connected to the front electrode of the first cell piece a of each cell string is then connected in series with the following plurality of cell pieces a to form a cell string. The electrode leading-out connecting piece 12 is made of flexible conductive material, and the upper surface of the electrode leading-out connecting piece 12 can be set to be corresponding color according to requirements, such as white for increasing reflectivity, or the color is consistent with that of the battery piece, and finally an attractive assembly is formed. The realization of the color of the upper surface can be realized by adhering the colored material layer on the flexible conductive material layer through the adhesive layer (that is, the electrode lead-out connecting piece 12 is formed by the flexible conductive material layer, the adhesive layer and the colored material layer (the outermost layer)); it is also possible to directly coat the colored material layer on the flexible conductive material (that is, the electrode lead-out connecting member 12 is constituted by the flexible conductive material layer and the colored material layer (outermost layer)).

The plurality of cell strings 301 are connected in series, such that the front electrodes of the cell sheets a are covered on the back electrodes of the adjacent cell sheets a, and a conductive medium is arranged between the covered front electrodes and the covered back electrodes.

in this embodiment, a p-type crystalline silicon cell is taken as an example, the front electrode of the cell slice a is a negative electrode, and the back electrode is a discontinuous positive electrode. The current difference of the battery piece a with the same specification is within 2 percent.

As shown in fig. 2, the front and back surfaces of the whole battery a before the battery piece a is cut are respectively provided with a main grid, the whole battery a is cut at a position close to the reserved position of the main grid to form a plurality of battery pieces a, and the main grids are distributed on the long side of the battery pieces a and are perpendicular to the short side of the battery pieces a.

as shown in fig. 3, when the cut battery pieces a are interconnected, the negative electrode (i.e. the front electrode) of the first battery piece a of each battery string is connected with an electrode leading-out connecting piece 12, and the battery pieces a are interconnected in a lamination manner, wherein the front main grid 10 of one battery piece a is overlapped on the back main grid 11 of an adjacent battery piece a, and a conductive medium is arranged at the contact position of the front main grid 10 and the back main grid 11.

As shown in fig. 4, after the battery pieces a are connected in series to a certain number (1-24), a plurality of battery strings 301 are arranged according to design, and the arrangement mode can be designed according to the battery condition.

A conductive medium (such as conductive adhesive) is arranged at the electrode connecting opening 9 on the inner side of the photovoltaic conductive back plate 401, and then the photovoltaic conductive back plate is placed on the correspondingly designed and arranged cell string 301, and the electrode connecting opening 9 is connected and conducted with the electrode of the cell string 301, so that the photovoltaic conductive back plate 401 is in conductive communication with the cell string 301.

specifically, the preparation method of the solar cell module comprises the following steps:

This embodiment adopts the electrically conductive backplate 401 of photovoltaic to make the subassembly, and the mode series welding that uses the lamination after whole piece battery A cuts becomes the cluster, need not connect between the battery cluster 301, arranges according to the design and places, places the electrically conductive backplate 401 of photovoltaic on battery cluster 301, and the electrically conductive structure 2 of photovoltaic 401 package is connected between and is switched on with battery cluster 301, constitutes the circuit that switches on each other, connects the terminal box through the output electrode 5 of the electrically conductive structure 3 of second at last, makes the subassembly.

The specific process is as follows:

Selecting a whole cell A, using a laser to perform incomplete cutting on the A at a position on the back of the A close to a reserved position of a main grid electrode, wherein the cutting depth reaches 40% -60% of the thickness of the A, then using a printing machine to watermark conductive adhesive on a main grid 11 on the back of the whole cell A, and using a slicing device to divide the whole cell A into a plurality of cell slices a with the size of 1/5. In fig. 2, (a), (b), (c) and (d) are schematic diagrams before and after the cell piece is cut, wherein (a) is the front surface of the cell piece before cutting, (b) is the back surface of the cell piece before cutting, (c) is the front surface of the cell piece after cutting, and (d) is the back surface of the cell piece after cutting.

manufacturing of the battery string 301: selecting an electrode leading-out connecting piece 12, coating conductive glue on one side of the electrode leading-out connecting piece 12, selecting a battery piece a, checking the appearance of the battery piece a, mutually overlapping the front main grid 10 of the battery piece a and one side of the electrode leading-out connecting piece 12 coated with the conductive glue to form conductive connection, then selecting a second battery piece a to check the appearance in the same way, mutually overlapping the front main grid 10 of the battery piece a and the back main grid electrode 11 of the first battery piece a, connecting the 3-24 battery pieces a in the same way, heating and curing to manufacture a battery string 301, wherein the whole series welding process can be completed in an automatic series welding machine.

The plurality of cell strings 301 are arranged according to a certain circuit structure, then the electrode connecting opening 9 of the glue film layer 4 on the photovoltaic conductive back plate 401 is coated with conductive glue (not limited thereto, the first electrode and the last electrode in the cell strings 301 may also be coated with conductive glue), and then the electrode connecting opening 9 and the electrode in the cell string 301 are connected according to the corresponding design to form connection conduction.

Fig. 6 is a circuit diagram of a solar cell module, and fig. 7 is a photovoltaic conductive back sheet 401 of corresponding design.

Next, the glass cover plate 101, the encapsulant film (EVA or POE)201, the battery string 301, and the photovoltaic conductive backsheet 401 are laid in order from the light-receiving surface to the backlight surface.

After the paving is finished, the processing procedures including EL test and lamination post-processing are carried out.

after that, a junction box with a diode is installed between the output electrodes 5 of the photovoltaic conductive back sheet 401 according to a circuit diagram, and a tiled solar cell module can be manufactured.

Example 2

The structure of the solar cell module provided in this embodiment is similar to that of embodiment 1, and is different only in that, as shown in fig. 12, in the solar cell module in this embodiment, the cell strings 301 are arranged in a single row, the number of the cell pieces contained in the cell strings 301 may be 36 (far exceeding 24), and accordingly, as shown in fig. 13, the photovoltaic conductive backsheet 401 only has the first conductive structures 2 and the second conductive structures 3, and the third conductive structures 100 are not required. Under the condition that the number of battery pieces contained in battery cluster 301 far exceeded 24, if use conventional technique, will greatly increase the piece rate, and through using the utility model discloses a photovoltaic conductive back plate 401 has not only simplified packaging technology, and is favorable to reducing the piece rate.

Example 3

The structure of the solar cell module provided in this embodiment is similar to that of embodiment 1, except that the solar cell module uses cells with different main gate electrode designs, and the electrode connection openings 9' on the photovoltaic conductive back sheet 401 are continuous and integrated.

In this example, two kinds of battery pieces were used, the first battery piece was the battery piece a in examples 1 and 2, and the second battery piece was the battery piece a'.

the second battery plate and the method for manufacturing the same will be described first.

as shown in fig. 14, a second cell a ' of a different main grid electrode design used in this embodiment has a front main grid 13 on its front surface, two discontinuous back main grids (a first back main grid 14 near the long edge of the cell a ' and a second back main grid 15 at the middle in the short edge direction) on its back surface, and the second cell is cut at a predetermined position near the back main grid 14 to form a plurality of second cells a '.

Next, the photovoltaic conductive backsheet 401 in this embodiment is as shown in fig. 16-19, wherein the first conductive structure 2 and the electrode connection interface 9' at the corresponding position of the third conductive structure 100 are a continuous integral body. Specifically, the first conductive structure 2 and the third conductive structure 100 are respectively disposed in a groove formed in the board body 1, the first conductive structure 2 and the third conductive structure 100 respectively include the adhesive film layer 6 and the conductive layer 7, and the insulating layer 8 may be omitted because the conductive layer 7 is not in direct contact with the outermost adhesive film layer 4. Therefore, the photovoltaic conductive backsheet 401 according to the embodiment is simpler to prepare, lower in production cost and shorter in preparation flow. The second conductive structure 3 is the same as that of embodiment 1, and the description thereof is omitted here.

The solar cell module of the embodiment is specifically prepared as follows:

The whole first battery a was selected and cut in the same manner as in example 1, and the description thereof is omitted.

then, selecting a whole second battery A ', using a laser to perform incomplete cutting on the A ' at a reserved position on the back surface of the B close to the back main grid 14, wherein the cutting depth reaches 40% -60% of the thickness of the B, then using a printing machine to watermark conductive adhesive on the back main grid 14 of the A ', and using a splitting device to split the A ' into a plurality of 1/5-sized battery slices a ', wherein (a), (B), (c) and (d) are schematic diagrams before and after the cutting of the battery slices, wherein (a) is the front surface of the battery slice A ' before the cutting, (B) is the back surface of the battery slice A ' before the cutting, (c) is the front surface of the battery slice a ' after the splitting, and (d) is the back surface of the battery slice a ' after the splitting.

Manufacturing the battery string: as shown in fig. 15, an electrode leading-out connecting piece 12 is selected, one side of the electrode leading-out connecting piece 12 is sprayed with conductive glue, a battery piece a is selected, the appearance of a is checked, and the front main grid electrode 10 of a and the side of the electrode leading-out connecting piece 12 coated with the conductive glue are overlapped to form conductive connection. And selecting a second battery piece a to check the appearance in the same way, so that the front main grid 10 of the second battery piece a is overlapped with the back main grid 11 of the first battery piece a, connecting a certain number of first battery pieces a according to the connection method of the second battery piece, then selecting a second battery piece a 'to check the appearance in the same way, so that the front main grid 13 of the second battery piece a is overlapped with the back main grid 11 of the adjacent first battery piece a to form conductive connection, then connecting a certain number of first battery pieces a according to the same method, then selecting a second battery piece a', so that the front main grid 13 of the second battery piece a is overlapped with the back main grid 11 of the adjacent first battery piece a, finally connecting a certain number of first battery pieces a, heating and curing to manufacture the battery string 301, wherein the whole series welding process can be completed in an automatic series welding machine.

Next, the plurality of cell strings 301 are arranged according to a certain circuit structure, then the electrode connection opening 9 of the adhesive film layer 4 on the photovoltaic conductive backplane 401 is coated with a conductive adhesive (without being limited thereto, the first electrode and the last electrode in the cell strings 301 may also be coated with a conductive adhesive), and then the electrode conductive connection opening 9 and the electrode in the cell string 301 are connected according to a corresponding design to form a connection conduction.

Next, the glass cover plate 101, the encapsulant film (EVA or POE)201, the battery string 301, and the photovoltaic conductive backsheet 401 are laid in order from the light-receiving surface to the backlight surface.

After the paving is finished, the processing procedures including EL test and lamination post-processing are carried out.

after that, a junction box with a diode is installed between the output electrodes 5 of the photovoltaic conductive back sheet 401 according to a circuit diagram, and a tiled solar cell module can be manufactured.

In addition to the above-described embodiments, there may be a series of modifications, for example, the battery pieces may all use the second type battery piece a', stacked in a string, and so on, and the enumeration thereof is omitted here.

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 (9)

1. A photovoltaic conductive backsheet, comprising:

The plate body is provided with a through hole;

the first conductive structures are arranged at two ends of the inner side of the plate body and extend along the transverse direction of the plate body, and the first conductive structures are used for being connected and conducted with electrodes at two ends of the battery string;

The second conductive structure is arranged on the inner side of the plate body and vertically extends along the plate body, one end of the second conductive structure is communicated with the first conductive structure, and the other end of the second conductive structure penetrates through the through hole and extends to the other side of the plate body; and

The adhesive film layer covers the inner side of the plate body so as to clamp the first conductive structure and the second conductive structure between the adhesive film layer and the plate body, and an electrode connecting opening is formed in the position, corresponding to the first conductive structure, of the adhesive film layer, so that electrodes at two ends of the battery string can penetrate through the electrode connecting opening to be connected and conducted with the first conductive structure.

2. The photovoltaic conductive backsheet according to claim 1, wherein the first conductive structure is laminated with a laminate film layer and a conductive layer in this order from the surface of the sheet body toward the laminate film layer.

3. the photovoltaic conductive backsheet of claim 2, wherein the first conductive structure further comprises an insulating layer disposed between the conductive layer and the adhesive film layer.

4. The photovoltaic conductive backsheet according to claim 2 or 3, wherein the electrode connecting opening is a plurality of openings arranged in a single body or intermittently, and the electrode connecting opening extends downward up to the conductive layer.

5. The photovoltaic conductive backsheet according to claim 3, wherein the second conductive structure is formed by sequentially laminating a rubber-sandwiched film layer, a conductive layer and an insulating layer from the surface of the sheet body toward the rubber-sandwiched film layer, the conductive layer and the insulating layer of the second conductive structure are respectively connected with the rubber-sandwiched film layer, the conductive layer and the insulating layer of the first conductive structure in a one-to-one correspondence manner, the other end of the second conductive structure is provided with an output electrode connected and conducted with the conductive layer, and the output electrode passes through the through hole and extends to the other side of the sheet body.

6. The photovoltaic conductive backsheet of claim 5, wherein the output electrode of the second conductive structure is integrally formed with the conductive layer.

7. The photovoltaic conductive backsheet according to claim 3, wherein a third conductive structure is further disposed between the adhesive film layer and the sheet body, the third conductive structure is located in the middle of the inner side of the sheet body and extends along the transverse direction of the sheet body, the third conductive structure is sequentially stacked from inside to outside on the surface of the sheet body with the adhesive film sandwiched layer, the conductive layer and the insulating layer, which are respectively connected to the adhesive film sandwiched layer, the conductive layer and the insulating layer of the first conductive structure in a one-to-one correspondence manner, wherein two rows of the electrode connecting openings are also disposed at positions of the adhesive film layer corresponding to two vertical side edges of the third conductive structure, each row includes an integral or discontinuous plurality of the electrode connecting openings arranged at intervals, and the electrode connecting openings extend downward to the conductive layer.

8. The photovoltaic conductive backsheet according to claim 7, wherein the first conductive structure, the second conductive structure and the third conductive structure are respectively provided with a groove at a position corresponding to the first conductive structure, the second conductive structure and the third conductive structure, and the first conductive structure, the second conductive structure and the third conductive structure are respectively laid in the grooves.

9. A solar cell module, comprising a cell string and the photovoltaic conductive backsheet according to any one of claims 1 to 8, wherein electrodes at two ends of the cell string are connected and conducted with the first conductive structure in the photovoltaic conductive backsheet.