CN211929507U

CN211929507U - Novel conductive core plate of back contact photovoltaic cell half-piece assembly

Info

Publication number: CN211929507U
Application number: CN202020652816.3U
Authority: CN
Inventors: 陈影; 张彩霞; 吴仕梁; 张凤鸣
Original assignee: Jiangsu Sunport Power Corp Ltd
Current assignee: Jiangsu Sunport Power Corp Ltd
Priority date: 2020-04-26
Filing date: 2020-04-26
Publication date: 2020-11-13
Anticipated expiration: 2030-04-26

Abstract

The utility model discloses a novel conductive core plate of a back contact photovoltaic cell half-plate assembly, which is formed by splicing a plurality of copper foils with specified patterns, wherein each copper foil connects the positive electrode of the front cell with the negative electrode of the back cell; be equipped with insulating gap between the copper foil of difference, every figure all uses the size of this battery piece as the basis, uses loudspeaker shape as the basis figure repetition on the battery piece to finally can cover whole battery piece and make full use of the space on the battery piece as the standard, the copper foil of difference is local, and every copper foil is arranged according to the composing shape of subassembly in proper order. The conductive core board can be compatible with batteries with different structural designs of a negative electrode point 6 multiplied by 6, a positive electrode point 5 multiplied by 5, a positive electrode point 5 multiplied by 6, a positive electrode point 5 multiplied by 7 and the like, is simultaneously suitable for the design of positive electrode point double dots, avoids the phenomena of short circuit of the positive electrode point and the negative electrode point, over-narrow local width of the conductive foil for transmitting current, resistance increase, uneven current distribution and the like of the original conductive foil, and can be produced in a large scale.

Description

Novel conductive core plate of back contact photovoltaic cell half-piece assembly

Technical Field

The utility model belongs to the technical field of novel MWT solar cell production facility technique and specifically relates to a novel electrically conductive core of back of body contact photovoltaic cell half piece subassembly.

Background

Nowadays, the photovoltaic industry is developing at a high speed, high-efficiency solar cell modules are receiving more and more attention, wherein an mwt (metal Wrap through) metal perforated winding cell is one of the main representatives of back contact solar cells, and because the front surface of the cell has no metal main grid lines, the front shading loss of the metal grid lines is effectively reduced, the utilization rate of incident light is improved, and the purpose of improving the photoelectric conversion efficiency of products is achieved.

In recent years, the market demand of solar photovoltaic modules is getting bigger and bigger, high-power and low-cost modules are popular, and in the aspect of improving the power, the power of a battery piece is mainly increased, the model structure of the module is changed, so that the power of a single module is improved as much as possible under the condition of changing less cost, and the market demand is met. At present, the half-chip module designs commonly used in the industry are 2 × 60 and 2 × 72, but with the pursuit of customers for high-power solar photovoltaic modules, the existing conductive core board design is not suitable for the module structure with 11 cells at two ends of the junction box, and is no longer satisfied with the two fixed designs.

SUMMERY OF THE UTILITY MODEL

In order to solve the problem in the above-mentioned background art, the utility model aims at providing a novel back of body contact photovoltaic cell half piece subassembly conductive core board, can compatible negative pole point 6 x 6, the battery of different structural design such as anodal point 5 x 5, 5 x 6, 5 x 7 is applicable to the design of anodal two dots simultaneously, avoid the phenomenon such as positive negative pole point short circuit, transmission current's conductive foil local width is too narrow increase resistance, current distribution is inhomogeneous that original conductive foil appears, can carry out large-scale production.

The utility model relates to a novel conductive core plate of a back contact photovoltaic cell half-piece assembly, which is formed by splicing a plurality of copper foils with specified patterns, wherein each copper foil connects the positive electrode of the front piece of cell with the negative electrode of the back piece of cell; be equipped with insulating gap between the copper foil of difference, every figure all uses the size of this battery piece as the basis, uses loudspeaker shape as the basis figure repetition on the battery piece to finally can cover whole battery piece and make full use of the space on the battery piece as the standard, the copper foil of difference is local, and every copper foil is arranged according to the composing shape of subassembly in proper order.

Further, the battery piece is 1/2 of a standard battery piece.

Furthermore, the battery pieces are connected in series end to form a single battery string, the whole assembly comprises two battery strings which are connected in parallel, each 11 battery pieces are connected in parallel with one diode, and the whole assembly is connected in parallel with three diodes.

Furthermore, in the assembly, the number of battery pieces controlled by each diode is singular, and in the assembly version of 2 × 63, the number of battery pieces controlled by one diode on each single-string battery string is 11.

Preferably, the copper foils are adhered to the EVA or POE adhesive films to form the arrangement of fixed patterns, so that the serial connection and the parallel connection of the module battery pieces are realized.

The utility model discloses electrically conductive core of back of body contact photovoltaic cell half piece subassembly

1. The utility model is suitable for half-sheet assemblies with different cell sizes 158, 162, 166, etc.;

2. the utility model is suitable for the module type is 2 x 63, 2 x 69 type, etc., and each diode controls the design that the number of the battery pieces is odd number;

3. the utility model discloses can use and produce the line equipment and accomplish, need not reform transform the upgrading, easily extensive popularization to reach the purpose that promotes subassembly power, economical and practical.

4. The position of the junction box of the utility model is designed to be 10 battery pieces away from the head part of the assembly and 11 non-assembly middle parts away from the tail part of the assembly;

5. the utility model discloses can compatible battery piece 5 x 6, 6 x 6 wait symmetrical structure's MWT battery pack and 5 x 6, 5 x 7, asymmetric structure's such as bipolar electrode MWT battery pack.

Drawings

Fig. 1 is a schematic plan view of a conductive core of a back contact photovoltaic cell half-sheet assembly according to the present invention;

FIG. 2 is a schematic design diagram of two adjacent series-connected strings according to the present invention;

FIG. 3 shows the design of two adjacent series of the original conductive core plates

Fig. 4 is a schematic diagram of a series circuit of the battery cell of the present invention;

fig. 5 is a schematic diagram of a diode of the present invention;

FIG. 6 is a schematic structural view of the present invention;

in the figure, 1-head, 2-tail, 3-insulating material layer, 4-metal conducting layer, 5-back plate layer and 6-packaging adhesive film layer.

Detailed Description

The present invention will be described in detail with reference to the accompanying drawings:

the circuit diagram of the utility model is shown in figure 1, the position of the junction box is designed to be more important than the head part 1 of the component, and the non-uniform symmetrical mode is presented; the conductive core board is formed by splicing a plurality of copper foils corresponding to the patterns shown in figure 1, the pattern of each copper foil is designed to be a staggered interdigital shape, the positive electrode of the front piece is connected with the negative electrode of the rear piece, each copper foil is adhered to EVA or POE, so that the positive electrode of the front piece of battery piece can be connected with the negative electrode of the rear piece of battery piece, insulating gaps with certain width are formed among different copper foils, such as a black line part in figure 1, each pattern is based on the size of the battery piece, and the pattern is repeated on the upper part of the pattern by taking a horn shape as a basic pattern, so that the whole battery piece can be covered finally, and the space on the battery piece is fully utilized, and different copper foils can be locally different; the copper foils with different patterns are sequentially arranged according to the typesetting shape of the components, so that the series connection and the parallel connection of the battery pieces are realized.

The design shown in fig. 2 is implemented at the head part 1 and the tail part 2 of the conductive core board, the design can implement the series connection of two adjacent strings of battery pieces, the design of the two adjacent strings of battery pieces of the original conductive core board is shown in fig. 3, for the design of the positive pole point of 5 × 6, the positive pole point and the negative pole point in the middle row are on the same straight line, the positive pole and the negative pole are in short circuit, the interconnection of circuits cannot be implemented, for the design that the positive pole point is a double-round point, the design of the two adjacent strings of battery pieces of the original conductive core board in series connection has a defect, namely, the copper foil at the position of a part of the point is narrow, in the packaging process of the assembly, the offset of glue points and the copper foil is easy to.

Furthermore, the battery pieces are connected in series end to form a single battery string, the whole assembly is formed by connecting two battery strings in parallel, in the single battery string, every 11 battery pieces are connected in parallel with one diode, and the whole assembly is connected in parallel with three diodes.

As a preferred feature of this embodiment, the number of battery pieces in the single string of battery strings is singular, and in the 2 × 63 module format, the number of battery pieces controlled by one diode in each single string of battery strings is 11; the circuit and diode design of the battery pieces is shown in fig. 4 and 5, each assembly is formed by connecting two battery strings in parallel, each battery string is connected with 63 battery pieces in series, and each 11 battery pieces are connected with one diode in parallel.

The conductive core board manufactured by adopting the design mode has the following specific preparation process:

the utility model discloses a structure from the top down is insulating material layer 3, metal conducting layer 4, encapsulation rete 6, backplate layer 5 (as figure 6) in proper order and shows, and the preparation method is:

the copper foil with the same width is compounded with EVA, the smooth surface of the copper is upward, the copper-clad EVA is subjected to laser scribing by using a solid laser, the copper surface is under the upper EVA during scribing, the laser scribing graph is shown in figure 1, and the copper foil at the black part in the graph is torn off after scribing, so that a conductive path with a specific graph is formed. Holes with specific patterns are punched on the EPE material by using a carbon dioxide laser, and the positions of the holes correspond to the positions of electrode points on the cell pieces and are used as insulating layers between the conductive layers 4 and the cell pieces. And sequentially stacking the back plate, the EVA, the conductive layer 4 and the EPE from bottom to top, and heating to bond the back plate, the EVA, the conductive layer 4 and the EPE together to form the integrated back plate with conductive capability.

The thickness of the copper foil used by the utility model is 20-65mm, the conductive channels on the copper foil are etched by laser, and the insulation interval of 0.5-4mm is arranged between the adjacent conductive channels; the packaging adhesive film used in this embodiment is an EVA layer or a POE layer; the utility model discloses a polymer polymerization board is used to the backplate.

The utility model discloses can realize the subassembly that the battery piece such as 2 x 63 or 2 x 69 is connected, the specification of battery piece can be 156, 158, 162, 166 and so on different specifications, the subassembly production when having realized photovoltaic module battery piece quantity for the singular, can compatible negative pole point 6 x 6, the positive pole point 5 x 5, 5 x 6, the battery of different structural design such as 5 x 7, be applicable to the design of positive pole double dots simultaneously, avoid the positive negative pole point short circuit that original conducting foil appears, the conducting foil local width of transmission current is too narrow to increase resistance, phenomenon such as electric current distribution is inhomogeneous, can carry out large-scale production.

The above description is only exemplary of the present application and should not be taken as limiting the present application, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. A novel conductive core plate of a back contact photovoltaic cell half-plate assembly is characterized in that the conductive core plate is formed by splicing a plurality of copper foils in specified patterns, and each copper foil connects the positive electrode of a front cell plate with the negative electrode of a back cell plate; be equipped with insulating gap between the copper foil of difference, every figure all uses the size of this battery piece as the basis, uses loudspeaker shape as the basis figure repetition on the battery piece to finally can cover whole battery piece and make full use of the space on the battery piece as the standard, the copper foil of difference is local, and every copper foil is arranged according to the composing shape of subassembly in proper order.

2. The novel conductive core of a back-contact photovoltaic cell half-wafer assembly as claimed in claim 1, wherein said wafer is 1/2 for a standard wafer.

3. The novel conductive core board of a back-contact photovoltaic cell half-chip module as claimed in claim 2, wherein the cells are connected in series end to form a single string of cells, the whole module comprises two cells connected in series and parallel, each 11 cells are connected in parallel with a diode, and the whole module is connected in parallel with three diodes.

4. The novel conductive core of a back-contact photovoltaic cell half-wafer assembly as claimed in claim 3, wherein the number of cells controlled by each diode in said assembly is singular, and in the 2 x 63 assembly version, the number of cells controlled by one diode in each single string is 11.

5. The novel conductive core board of back contact photovoltaic cell half-sheet assembly as claimed in any one of claims 1 to 4, wherein the copper foil is attached by EVA or POE adhesive film to form a fixed pattern arrangement, thereby realizing series and parallel connection of the module cells.