CN213692074U

CN213692074U - Solar cell module for non-shielding module packaging technology

Info

Publication number: CN213692074U
Application number: CN202023227382.1U
Authority: CN
Inventors: 胡燕; 刘燕; 杨冬生; 曹思远; 郭万武
Original assignee: Jetion Solar Jiangsu Co Ltd
Current assignee: Jetion Solar Jiangsu Co Ltd
Priority date: 2020-12-29
Filing date: 2020-12-29
Publication date: 2021-07-13
Anticipated expiration: 2030-12-29

Abstract

The utility model discloses a solar battery component for the encapsulation technology of a non-shielding component, which comprises a plurality of battery slices, wherein each battery slice comprises a plurality of strip-shaped battery slices, and each battery slice in the battery slices is sequentially connected in series end to end and spliced and lapped; all the battery pieces are distributed side by side and are sequentially connected in series end to end; the front side of the battery slice is provided with a main grid line and a plurality of auxiliary grid lines, and two ends of the main grid line are connected with a welding strip and a strip-shaped back electrode which are respectively arranged on the front side and the back side of the battery slice; between two adjacent battery slices of the battery slice, the back electrode of one battery slice is connected with the welding strip of the other battery slice through the conductive medium. According to the solar cell module for the shielding-free module packaging technology, the adjacent cell slices in the cell slices are longitudinally connected, shielding-free high-density stitch welding packaging is realized, the generated energy is improved, the length of a conductive medium is shortened, and the manufacturing cost is reduced; in addition, the shading area is reduced, and the power generation capacity is improved.

Description

Solar cell module for non-shielding module packaging technology

Technical Field

The utility model relates to a solar cell stitch welding technical field, in particular to a solar module for there is not subassembly packaging technology that shelters from.

Background

In a conventional photovoltaic module, the cells are connected to each other by solder strips, such that one end of each solder strip is connected to the front electrodes of the cells and the other end is connected to the back electrodes of the adjacent cells, thereby forming a series array of cells. However, as the market demand for high power devices becomes higher, the power of the conventional photovoltaic device is difficult to achieve higher demand. The way of realizing series connection by adopting the way of cell lamination appears on the market.

The utility model discloses a chinese utility model patent that publication number is CN206992129U discloses a solar wafer, include the silicon chip and set up the electrode on the silicon chip, the electrode is including setting up in the first main grid line of the first face of silicon chip, a plurality of first thin grid lines of being connected with first main grid line and setting up in a plurality of second main grid lines of silicon chip second face, the array orientation of first main grid line is unanimous and the two quantity of second main grid line is the same, the distance between every adjacent first main grid line and between the adjacent second main grid line is the same, and in the array orientation, first main grid line and second main grid line stagger the setting each other, make first main grid line and second main grid line corresponding and constitute the electrode unit, at least one kind of first main grid line and second main grid line adopts the discontinuous design. The grid line direction of this battery piece all keeps unanimous, does not need rotatory battery section when carrying out stitch welding, and processing is convenient and practice thrift man-hour.

However, in the solar cell, because the welding strip is connected in a transverse connection mode when being connected to the second main grid line on the second surface of another silicon wafer from the first main grid line on the first surface of one silicon wafer, and the first main grid line and the second main grid line are both arranged at the edge positions of the cell, a longer welding strip is needed for connection, the material consumption of the welding strip of the solar cell is increased, so that the manufacturing cost is increased, and the main grid lines are arranged at the edge positions of the silicon wafers, so that the flowing path of current entering the main grid lines through the auxiliary grid lines during photovoltaic power generation is prolonged, the current loss is increased, and the generated energy is reduced. Therefore, there is a need for improvements in existing solar cell modules.

SUMMERY OF THE UTILITY MODEL

To the above prior art, the to-be-solved technical problem of the utility model is: in order to overcome the defects of the prior art, the solar cell module for the shielding-free module packaging technology is high in power generation amount, small in material consumption and low in cost.

In order to solve the technical problem, the utility model adopts the technical scheme that: a solar cell module for a non-shielding packaging technology comprises a plurality of adjacent cell slices, wherein each cell slice comprises a plurality of long-strip-shaped cell slices with the same size, each cell slice in the cell slices is sequentially spliced end to end in series along the length direction of the cell slice, and the end part of the back side of the previous cell slice is overlapped with the end part of the front side of the next cell slice along the distribution direction of the cell slices; all the battery slices are distributed side by side along the direction parallel to the front side of the battery slice and are sequentially connected in series end to end; the front side of the battery slice is provided with a main grid line parallel to the length direction of the battery slice and a plurality of auxiliary grid lines vertically connected with the main grid line, two ends of the main grid line are connected with a welding strip and a long-strip-shaped back electrode, the welding strip and the back electrode are respectively arranged on the front side and the back side of the battery slice, and the length directions of the welding strip and the back electrode are parallel to the auxiliary grid lines; and in two adjacent battery slices of the battery slice, the back electrode of one battery slice is connected with the welding strip of the other battery slice through a conductive medium.

Preferably, in order to save conductive medium materials, reduce cost and facilitate the series connection of adjacent battery slices in the battery slice, the distribution directions of the welding strips and the back electrode on each battery slice in the battery slice are the same.

Preferably, in order to facilitate the series connection of two adjacent battery pieces, reduce the consumption of series connection materials and reduce the cost, the welding strips on the battery pieces and the back electrode in the two adjacent battery pieces are distributed in opposite directions.

Preferably, in order to reduce the consumption of the conductive medium and the manufacturing cost, the welding strip and the back electrode are both arranged at the end of the battery slice.

Preferably, in order to connect two adjacent battery slices in the battery slice, the conductive medium is a welding strip or a welding wire.

Preferably, in order to ensure the series connection effect of two adjacent battery slices, the cross section of the conductive medium is circular, and the diameter of the conductive medium is 0.30-0.35 mm.

Preferably, in order to realize series connection between two adjacent battery plates, the two adjacent battery plates are connected through a flexible bus bar.

Preferably, in order to ensure the current transmission effect, reduce the shading influence of the main grid lines and ensure the generated energy, two main grid lines are arranged on each battery slice.

Preferably, in order to ensure the power generation capacity of the battery pack and avoid excessive manufacturing cost, the number of the battery slices in the battery slice is 5-9.

Preferably, in order to ensure the power generation capacity of the battery assembly and reduce the process requirements on the packaging technology, the distance between two adjacent battery pieces is 0.2 mm.

To sum up, the utility model is used for there is not solar module who shelters from subassembly packaging technology compares with prior art, and the mode through longitudinal connection establishes ties adjacent battery section in with the battery piece, when realizing not sheltering from the encapsulation of high density stitch welding, has shortened conducting medium's length, reduces the cost of manufacture to reduce the shading area, further improved the generated energy.

Drawings

Fig. 1 is a schematic structural view of the battery plate of the present invention during cutting;

fig. 2 is a rear view of the battery piece of the present invention when cut;

fig. 3 is a schematic structural diagram of the solar cell module according to the present invention;

FIG. 4 is an enlarged view of portion A of FIG. 3;

fig. 5 is a schematic view of a connection structure of two adjacent battery slices in the same battery slice of the battery assembly of the present invention;

in the figure: 1. the battery comprises a battery piece, 2 battery slices, 3 main grid lines, 4 auxiliary grid lines, 5 welding bars, 6 back electrodes, 7 conductive media and 8 bus bars.

Detailed Description

The following description will further describe embodiments of the present invention with reference to the accompanying drawings and examples. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.

As shown in fig. 1-5, the solar cell module for the non-shielding module packaging technology of the present invention includes six adjacent battery slices 1, each battery slice 1 includes five battery slices 2 with the same size and in a strip shape, each battery slice 2 in the battery slice 1 is sequentially spliced in series end to end along the length direction thereof (as shown in fig. 3), and the back end of the previous battery slice 2 is overlapped with the front end of the next battery slice 2 along the distribution direction thereof (as shown in fig. 5); the battery slices 1 are distributed side by side along the direction parallel to the front side of the battery slice 2 and are connected in series end to end in sequence; the front side of the battery slice 2 is provided with a main grid line 3 parallel to the length direction of the battery slice and a plurality of auxiliary grid lines 4 vertically connected with the main grid line 3, two main grid lines 3 are arranged, two ends of each main grid line are connected with a welding strip 5 and a back electrode 6, the welding strips 5 and the back electrodes 6 are respectively arranged on the front side and the back side of the battery slice 2, the welding strips 5 and the back electrodes 6 are both in a long strip shape and are arranged at the end parts of the battery slices 2, the distribution directions of the welding strips 5 and the back electrodes 6 on each battery slice 2 in the battery slice 1 are the same, and the length direction of the welding strips 5 and the length direction of the back electrodes 6 are both parallel to the auxiliary grid lines 4 (as; between two adjacent battery slices 2 of the battery slice 1, the back electrode 6 of one battery slice 2 is connected with the welding strip 5 of the other battery slice 2 through a conductive medium 7, the conductive medium 7 is a welding strip, the cross section of the conductive medium 7 is circular, and the diameter of the conductive medium 7 is 0.35 mm; in two adjacent battery slices 1, the distribution directions of the welding strips 5 and the back electrodes 6 on the battery slices 2 are opposite, the two adjacent battery slices 1 are connected through a flexible bus bar 8 (as shown in fig. 5), and the distance between the two adjacent battery slices 1 is 0.2 mm.

The solar cell module is mainly formed by sequentially splicing six cell slices 1 end to end in series, each cell slice 1 is cut into five cell slices 2 with the same size (as shown in fig. 1 and fig. 2, the cell slice 1 is cut at the position of a dotted line in the figure, the cell slice 1 is divided into five equal parts to form five cell slices 2 with the same size), five cell slices 2 in the cell slices 1 are sequentially spliced along the length direction and are adjacent end to end, according to the series sequence, a back electrode 6 at the tail end of a previous cell slice 2 is connected with a welding strip 5 at the head end of the next cell slice 2 through a conducting medium 7, and the back end of the previous cell slice 2 is overlapped with the front head end of the next cell slice 2 (in fig. 3, each row of cell slices 2 form one cell slice 1, all cell slices 2 are distributed in a matrix, for the cell slices 1 in the first row, the third row and the fifth row, the head end and the tail end of each battery slice 2 are respectively the top end and the bottom end, and for the battery slices 1 in the second row, the head end and the tail end of each battery slice 2 are respectively the bottom end and the top end, the parts of the two battery slices 2 are welded through the conductive medium 7, and the two adjacent battery slices 1 are connected through the bus bar 8, so as to realize the serial connection of the six battery slices 1 sequentially from head to tail (in fig. 3, the bottom end of the first row), because the serial connection part of the two adjacent battery slices 1 has a height difference due to the overlap welding of the battery slices 2, in order to ensure the serial connection effect from head to tail, the bus bar 2 has a thickness of 0.322mm and a width of 5.5mm, the bus bar 2 is mainly made of copper bars, and the two sides of the bus bar 2 are welded with tin, so that the bus bar 2 has flexibility, the thickness and width of the bus bar 2 may each float within 10% of the thickness and width, respectively, as determined above.

In the utility model, the battery slices 2 in the battery slice 1 are vertically arranged and then welded, so that a longitudinal connection mode is adopted, and compared with a transverse connection mode in the prior art, the length of the conductive medium 7 can be saved, thereby saving the using amount of the conductive medium 7 and reducing the production cost, and in addition, along with the shortening of the length of the conductive medium 7, the shading area is reduced, and the power generation amount of the battery assembly is improved; in addition, the two main grid lines 3 are arranged in the cell slice 1, so that on one hand, the current collection capability is improved, and on the other hand, because the main grid lines 3 are not arranged close to the side edges of the cell slice 2, the path length of current passing from the thin grid lines 4 to the main grid lines 3 during photovoltaic power generation is shortened, the current loss is reduced, and the power generation capability is improved.

The conductive medium 7 is a welding strip with a circular cross section, and compared with a flat welding strip, the circular welding strip can realize secondary reflection inside partial light, so that effective incident light absorption is increased, and the generating capacity is improved; in the actual power generation process, when light rays are obliquely incident in the morning and evening, the battery assembly still has power generation gain. The outer diameter of the welding strip is 0.35mm, so that on one hand, the welding strength is ensured, on the other hand, the influence on the generating capacity due to the overlarge shading area of the welding strip is avoided, and the diameter of the welding strip can be selected within the range of 0.30-0.35mm as a replacement of similar effects; the welding strips 4 and the back electrode 6 adopt a strip-shaped design, so that the stitch welding effect between two adjacent battery slices 2 can be ensured, and the current is smoothly transmitted from the previous battery slice 2 to the next battery slice 2; in the actual production process, the battery piece 1 can be equally divided into 6-9 battery slices 2, the number of the cut battery slices 2 is reduced, mechanical damage to the battery piece 1 can be reduced, the flowing path of current on the thin grid line 4 can be prolonged, current loss is increased, and therefore the power generation amount is increased; the number of cut battery slices 2 is increased to reduce the loss of current during transmission, but the mechanical damage to the battery piece 1 is increased due to the increase in the number of cuts, and therefore, the battery piece 1 is selected to be cut into 5 to 9 parts.

When stitch welding is carried out, the distance between the overlapped end parts of two adjacent battery slices 2 is 0.2mm, on one hand, the requirement on the manufacturing process is prevented from being improved due to the excessively small distance, and on the other hand, a sufficient number of battery assemblies can be placed under the assembly with the same size, so that the generating capacity is improved. After the stitch welding technology is adopted, the sheet spacing of the two adjacent battery slices 2 is the negative spacing during stitch welding connection, high-density welding is achieved, more battery slices 2 can be placed under the same area, the conducting medium 7 is located at the lap joint of the two adjacent battery slices 2, no shielding is achieved, and the generating capacity is further improved. On the basis, the two adjacent battery slices 2 are connected in series through the conductive medium 7, so that the length of the conductive medium 7 is greatly shortened, the material consumption of the conductive medium 7 is reduced, and the manufacturing cost is reduced.

The foregoing is only 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 technical principle of the present invention, and these improvements and decorations should also be regarded as the protection scope of the present invention.

Claims

1. A solar cell module for a non-shielding module packaging technology comprises a plurality of adjacently arranged cell pieces (1), and is characterized in that:

each battery slice (1) comprises a plurality of battery slices (2) which are the same in size and are long-strip-shaped, each battery slice (2) in each battery slice (1) is sequentially spliced end to end in series along the length direction of the battery slice, and the end part of the back side of the previous battery slice (2) is lapped with the end part of the front side of the next battery slice (2) along the distribution direction of the battery slices; the battery slices (1) are distributed side by side along the direction parallel to the front surface of the battery slice (2) and are sequentially connected in series end to end;

the front surface of the battery slice (2) is provided with a main grid line (3) parallel to the length direction of the battery slice and a plurality of auxiliary grid lines (4) vertically connected with the main grid line (3), two ends of the main grid line (3) are connected with a welding strip (5) and a strip-shaped back electrode (6), the welding strip (5) and the back electrode (6) are respectively arranged on the front surface and the back surface of the battery slice (2), and the length directions of the welding strip and the back electrode are parallel to the auxiliary grid lines (4);

in two adjacent battery slices (2) of the battery slice (1), the back electrode (6) of one battery slice (2) is connected with the welding strip (5) of the other battery slice (2) through a conductive medium (7).

2. The solar cell module for the technology of encapsulation of an unobstructed assembly according to claim 1, wherein: the distribution directions of the welding strips (5) and the back electrodes (6) on the battery slices (2) in the battery slices (1) are the same.

3. The solar cell module for the technology of encapsulation of an unobstructed assembly according to claim 2, wherein: in two adjacent battery slices (1), the distribution directions of the welding strips (5) and the back electrodes (6) on the battery slices (2) are opposite.

4. The solar cell module for the technology of encapsulation of an unobstructed assembly according to claim 3, wherein: the welding strip (5) and the back electrode (6) are arranged at the end part of the battery slice (2).

5. The solar cell module for the technology of encapsulation of an unobstructed assembly according to claim 1, wherein: the conductive medium (7) is a welding strip or a welding wire.

6. The solar cell module for the technology of encapsulation of an unobstructed assembly according to claim 5, wherein: the cross section of the conductive medium (7) is circular, and the diameter of the conductive medium (7) is 0.30-0.35 mm.

7. The solar cell module for the technology of encapsulation of an unobstructed assembly according to claim 1, wherein: two adjacent battery plates (1) are connected through a flexible bus bar (8).

8. Solar cell module for use in an obscuration free module encapsulation technique according to any of claims 1 to 7 characterized in that: two main grid lines (3) on each battery slice (2) are arranged.

9. Solar cell module for use in an obscuration free module encapsulation technique according to any of claims 1 to 7 characterized in that: the number of the battery slices (2) in the battery slice (1) is 5-9.

10. The solar cell module for use in the technology of unshielded module encapsulation according to claim 9, wherein: the distance between two adjacent battery pieces (1) is 0.2 mm.