CN209119119U - Battery strip piece, solar battery sheet and photovoltaic module - Google Patents

Abstract

The utility model discloses a strip-shaped cell, a solar cell and a photovoltaic assembly. The strip-shaped cell has long sides and short sides, and the front of the strip-shaped cell has a front main grid arranged along the edge of the short side. . It can realize the overlapping connection of the short sides of the long battery sheets, which can greatly shorten the welding part and improve the battery efficiency.

Description

Strip cells, solar cells and photovoltaic modules

technical field

The utility model relates to a strip-shaped cell, a solar cell, and a photovoltaic assembly connected by the strip-shaped cell, belonging to the technical field of solar power generation.

Background technique

Traditional solar cells are connected by bus bars, and the use of a large number of bus bars will increase the internal consumption of the solar module and reduce the conversion efficiency of the solar module.

In order to improve the conversion efficiency of solar modules, shingling technology has emerged. Generally speaking, shingling technology is to reasonably cut the cells into small pieces, and then overlap and connect the edges of the cut small pieces to make photovoltaic modules. After series and parallel typesetting, it is pressed into components. Reasonable application of shingling technology can place more cells within the range of the cable, while reducing the line loss of solar modules and greatly improving the output power of the modules.

Taking all five solar cells as an example, please refer to FIG. 1 , the front electrode of the cell 99 includes a main grid 97 and a number of auxiliary grid lines 95 . Another welding point connected to the battery sheet; please refer to FIG. 2, the back electrode of the battery sheet 99 includes the back electrode busbar 93 and the back secondary electrode 91, the back electrode busbar 93 corresponds to the front busbar 97, and is arranged on the edge of the battery, Several backside secondary electrodes 91 are distributed on the backside of the cell sheet 99 at intervals.

The front and back electrodes are used together. When the assembly is welded, the main grid 97 of the front electrode of one cell 99 and the back electrode main grid 93 of the other battery are connected together by conductive glue. The backside secondary electrode 91 is used as a connection point with the module bus bar, and is only used in the first cell sheet 99 and the last cell sheet 99 in a string of cells.

Because the battery of the existing solar cell is designed with the busbar of the front electrode at the edge of the long side of the cell, multiple busbars need to be set on the front of the cell before cutting, because the busbar is used as a welding with another cell. At this point, a sufficient width must be ensured, which will lead to a sharp increase in the shading area of the cell, and an increase in the amount of silver paste.

Utility model content

The purpose of the present invention is to provide a bar-shaped battery sheet that can improve the efficiency,

In order to achieve the above purpose of the utility model, the utility model provides a bar-shaped battery sheet, the bar-shaped battery sheet has a long side and a short side, and the front side of the bar-shaped battery sheet has a front main grid arranged along the edge of the short side.

As a further improvement of an embodiment of the present invention, the line width of the front busbar is 0.5 mm to 3 mm.

As a further improvement of an embodiment of the present invention, the front surface of the strip-shaped battery sheet is further provided with a number of auxiliary grid lines for collecting current and auxiliary grid lines connecting the auxiliary grid lines and the front main grid.

As a further improvement of an embodiment of the present invention, the length of the auxiliary grid line is N times the length of the front busbar, and N is an integer not less than 4.

As a further improvement of an embodiment of the present invention, the line width of the auxiliary grid line is smaller than that of the front busbar, and the line width of the auxiliary grid line is 0.3 mm to 2 mm.

As a further improvement of an embodiment of the present invention, the auxiliary grid lines are arranged parallel to the front busbars, and the auxiliary grid lines are vertically connected to the secondary gridlines and the front busbars.

As a further improvement of an embodiment of the present invention, the auxiliary grid line has one, and is located in the middle position of the strip-shaped battery sheet in the extension direction of the short side.

As a further improvement of an embodiment of the present invention, at least two auxiliary grid lines are arranged at intervals in the extending direction of the short side of the strip-shaped battery sheet, and at least two auxiliary grid lines are arranged in the extending direction of the long side of the strip-shaped battery sheet. All secondary gate lines are connected in series.

As a further improvement of an embodiment of the present invention, the line width of the auxiliary grid line gradually decreases from the end connected to the front busbar toward the end away from the front busbar.

As a further improvement of an embodiment of the present invention, the line width of the end of the auxiliary grid line connected to the front busbar is 0.5 mm to 3 mm, and the line width of the end away from the front bus bar is 0.01 to 0.2 mm.

As a further improvement of an embodiment of the present invention, a rear side busbar is provided on the opposite side edge of the back side of the strip-shaped battery sheet and the front side busbar.

As a further improvement of an embodiment of the present invention, the backside of the bar-shaped battery sheet is further provided with a backside welding pad, and the backside welding pad is perpendicular to the backside busbar and arranged in the middle of the bar-shaped battery sheet.

As a further improvement of an embodiment of the present invention, the line width of the back welding pad is 0.5 mm to 3 mm, and the line length is 3 mm to 30 mm.

Compared with the prior art, the beneficial effect of the present utility model is that because the front side of the strip-shaped battery sheet has a front main grid arranged along the edge of the short side, the overlapping connection of the short sides of the long strip-shaped battery sheet can be realized, and the length of the battery can be greatly shortened. Welded parts to improve battery efficiency.

Another object of the present invention is to provide a solar cell sheet, the solar cell sheet includes a plurality of strip-shaped cell sheets that are integrally connected but not separated, and the strip-shaped cell sheets are arranged as described in any one of the above.

Compared with the prior art, the utility model has the beneficial effects of realizing the overlapping connection of the short sides of the elongated battery sheets, greatly shortening the welding part, and improving the battery efficiency.

Another object of the present invention is to provide a photovoltaic module, comprising a plurality of battery strings, each of the battery strings including a plurality of strip-shaped battery sheets stacked and connected at the edges by conductive glue, and the strip-shaped battery sheets are as above Any one of the above-mentioned settings, and two adjacent strip-shaped battery sheets are connected in a way of superimposing their short sides.

As a further improvement of an embodiment of the present invention, the length of the long side of the strip-shaped battery sheet is N times the length of the short side, and in the plurality of battery strings, each N strings of battery strings are connected in parallel by bus bars, And N is an integer not less than 4.

Compared with the prior art, the utility model has the beneficial effects of realizing the overlapping connection of the short sides of the elongated battery sheets, greatly shortening the welding part, and improving the battery efficiency.

Description of drawings

Fig. 1 is the schematic diagram of the front electrode of the solar cell sheet of the prior art;

Fig. 2 is the schematic diagram of the back electrode of the solar cell sheet shown in Fig. 1;

3 is a schematic diagram of the front electrode of the solar cell provided by the first embodiment of the present invention;

4 is a schematic diagram of a front electrode of a sliced battery provided by another embodiment of the present invention;

Fig. 5 is the schematic diagram of the back electrode of the solar cell shown in Fig. 3;

6 is a schematic structural diagram of the overlapping connection of the short sides of the sliced battery provided by an embodiment of the present invention;

7 is a schematic diagram of the front electrode of the solar cell provided by the second embodiment of the present invention;

FIG. 8 is a schematic structural diagram of the overlapping connection of the short sides of the solar cell shown in FIG. 7

Hereinafter, some specific embodiments of the present invention will be described in detail by way of example and not limitation with reference to the accompanying drawings. The same or similar parts or parts are designated by the same reference numerals in the figures. It should be understood by those skilled in the art that these drawings are not necessarily drawn to scale. For example, some dimensions of structures or parts may be appropriately exaggerated relative to other structures or parts for the convenience of illustration. Therefore, the accompanying drawings are only used to illustrate the present invention. The basic structure of the subject of the application.

Detailed ways

The present invention will be described in detail below with reference to the specific embodiments shown in the accompanying drawings. However, these embodiments do not limit the present invention, and structural, method, or functional transformations made by those of ordinary skill in the art according to these embodiments are all included within the protection scope of the present invention.

It should be understood that, in the description of the present invention, the terms "first", "second", etc. are only used for description purposes, and should not be interpreted as indicating or implying relative importance or implicitly indicating the indicated technical features. quantity. Thus, a feature defined as "first" or "second" may expressly or implicitly include one or more of that feature.

In the present invention, unless otherwise expressly specified and limited, a first feature "on" or "under" a second feature may include the first and second features in direct contact, or may include the first and second features The features are not in direct contact but through additional features between them.

FIG. 3 and FIG. 4 show several strip-shaped cell sheets 100 according to the first embodiment of the present invention, which are obtained by cutting the original solar cell sheet 1000 into five equal parts. The original solar cell 1000 is formed by laser scribing to form several cutting grooves 152, so that the final splits can be separated to obtain five strip-shaped cells 100. The five strip-shaped cells 100 have the same structure. 100 is in the shape of a long bar. For the convenience of description, the term battery bar 100 is used instead of the bar-shaped battery sheet 100 in some paragraphs below to facilitate understanding. The following description will be given by taking one of the strip-shaped battery sheets 100 as an example.

It should be noted that, before the solar cell sheet 1000 is cut, several strip-shaped cell sheets 100 that are integrally connected but not separated are included. That is to say, there is no gap on the front surface of the solar cell sheet 1000 after cutting, and the cutting groove 152 cannot be seen. In FIG. 3, only five strip-shaped battery sheets 100 are placed together, so there seems to be a gap.

Please refer to FIG. 3 and FIG. 4 , the strip-shaped battery sheet 100 provided by the embodiment of the present invention includes a base body, and the base body is rectangular, including long sides and short sides, and the length of the long side of the strip-shaped battery sheet is N times the length of the short side. And N is an integer not less than 4. The strip-shaped battery sheet 100 has a first short side edge and a second short side edge.

The base body includes a front surface 110 and a back surface 120 , the front surface 110 is provided with a front electrode, and the back surface 120 is provided with a back electrode. The front electrode includes a number of sub grid lines 136 for collecting current, a front bus bar 132 connected with the sub grid lines 136 , and the front bus bar 132 is connected with the back electrode on another strip-shaped cell 100 . In this embodiment, the front electrode further includes an auxiliary gate line 131 , and the front main gate 132 is connected to the sub gate line 136 through the auxiliary gate line 131 .

Therefore, in the strip-shaped battery sheet 100 of this embodiment, the auxiliary grid lines 136 collect the photo-generated current on the surface of the substrate, the auxiliary grid lines 131 are connected to the auxiliary grid lines 136 and collect the currents on all the auxiliary grid lines 136, and the front main grid 132 will assist the auxiliary grid lines 136. The current on the grid line 131 is connected to the other bar-shaped battery sheet 100. Normally, the front busbar 132 is electrically connected to the back electrode of the other bar-shaped battery sheet 100 to realize current communication, thereby realizing current collection and operation. transmission.

In this embodiment, the base body is a silicon wafer. If possible, the base body can also be made of other materials. The material of the base body is not the focus of the present invention. Any solutions that are the same or similar to those in this embodiment are covered by the present invention. within the scope of protection

Referring to FIG. 3 , in this embodiment, preferably, a plurality of sub-grid lines 136 are arranged on the front surface 110 in parallel and spaced apart, and are arranged at equal intervals.

Specifically, the plurality of sub-gate lines 136 extend from one long side of the base body to the other long side, and the width of the plurality of sub-gate lines 136 is approximately equal to the width of the base body. A plurality of sub grid lines 136 are arranged in parallel and spaced apart along the length direction of the substrate. Preferably, a plurality of sub grid lines 136 are arranged in parallel and spaced apart at equal intervals, which can better collect the photo-generated current on the substrate.

Preferably, in this embodiment, the auxiliary gate line 131 is perpendicular to the auxiliary gate line 136 .

Therefore, since several auxiliary gate lines 136 are parallel, the auxiliary gate lines 131 are perpendicular to the auxiliary gate lines 136, that is to say, the auxiliary gate lines 131 are perpendicular to all the auxiliary gate lines 136. Therefore, one auxiliary gate line 131 can be connected to all auxiliary gate lines 131. The auxiliary gate lines 136 are connected vertically, and one auxiliary gate line 131 can collect the currents of all the auxiliary gate lines 136, and the structure design is very ingenious.

Preferably, in this embodiment, the number of auxiliary grid lines 131 is one, and the auxiliary grid lines 131 are located in the middle position of the strip-shaped battery sheet 100 in the extending direction of the short side. One end of the auxiliary grid line 131 is connected to the front main grid 132 on the first short side edge, and the other end extends to the second short side edge.

Since the auxiliary grid line 131 is located in the middle of the strip-shaped cell 100 , the auxiliary grid line 131 can simultaneously collect the currents on the auxiliary grid lines 136 on both sides thereof, thereby greatly reducing the resistance loss and improving the collection efficiency.

Referring to FIG. 4 , in another embodiment of the present invention, the number of auxiliary gate lines 131 is two, and the auxiliary gate lines 136 are connected in series along the long edges on both sides of the front surface 110 . The two auxiliary gate lines 131 can better prevent gate breakage. Those skilled in the art can imagine that at least two auxiliary grid lines 131 are arranged at intervals in the extending direction of the short side of the strip-shaped battery sheet 100 , and at least two auxiliary grid lines 131 are connected in series in the extending direction of the long side of the strip-shaped battery sheet 100 . The sub-gate line 136 may also be used.

In this embodiment, the length of the auxiliary gate line 131 is N times the length of the front bus bar 132 , and N is an integer not less than 4.

In this embodiment, the width of the auxiliary grid line 131 is between 0.3 mm and 2 mm. This value is only exemplary, and does not constitute a limitation of the present invention. Any solution that is the same or similar to this embodiment is covered within the scope of protection of the present invention.

Please return to FIG. 3 . Preferably, in this embodiment, the front main grid 132 is perpendicular to the auxiliary grid line 131 , and the two form a T-shape.

The front main grid 132 is perpendicular to the auxiliary grid lines 131 , and has other angles than the front main grid 132 and the auxiliary grid lines 131 .

Preferably, in this embodiment, the midpoint of the front main grid 132 is connected to the end point of the auxiliary grid line 131 .

Therefore, the current on the auxiliary grid line 131 can flow to the front bus bar 132 , thereby improving the efficiency of the strip-shaped battery sheet 100 .

As mentioned above, the entire base body is rectangular. In this embodiment, the front bus bar 132 is disposed near the short side edge of the rectangular base body. Specifically, the front bus bar 132 is disposed close to the first short side edge on the front surface 110 of the rectangular base body.

In this embodiment, the width of the front busbar 132 is between 0.5mm and 3mm. This value is only exemplary and does not constitute a limitation of the present invention. Any solutions that are the same or similar to those of this embodiment are covered. within the scope of protection of the present invention.

Referring to FIG. 5 , in this embodiment, preferably, the back electrode on the back side 120 includes a back side bus bar 141 and a back side welding pad 142 , the back side bus bar 141 is connected to the front side bus bar 132 of another strip-shaped cell 100 , and the back side welding pad 142 Connect with the ribbon.

When the strip-shaped battery sheet 100 of this embodiment is used, the rear busbar 141 and the front busbar 132 of another strip-shaped battery sheet 100 are connected together by conductive glue. Of course, the two can also be connected and conduct electricity in other ways, and any solution that is the same or similar to this embodiment is covered within the protection scope of the present invention.

Those skilled in the art can think that when the bar-shaped cells form a battery string, the backside of the bar-shaped cell in the middle of the battery string may not be provided with a rear busbar. The purpose of the cost utility model can also be achieved by using conductive glue for lamination connection with the edge of the aluminum back field.

Referring to FIG. 6 , in this embodiment, the front busbar 132 is located on the front side of the strip-shaped battery sheet 100 and close to the edge of the first short side, the backside 120 is rectangular, and the backside busbar 141 is located on the backside 120 of the strip-shaped battery sheet 100 and Set near the second short edge. The front main grid 132 and the rear main grid 141 connecting the strip-shaped battery sheets 100 are located on the two short side edges of the substrate, respectively. The back side busbar 141 of the second short side edge of the back side 120 of a strip-shaped battery sheet 100 is connected... Repeating this, the short sides of the long strip-shaped battery sheet can be overlapped and connected to form a battery series, which can greatly shorten the welding part and improve the battery performance. efficiency.

The shape and area of the rear busbar 141 is consistent with the shape and area of the front busbar 132 .

Returning to FIG. 5 , in this embodiment, the lengthwise extending direction of the backside bonding pads 142 is perpendicular to the lengthwise extending direction of the backside busbar 141 . Preferably, the backside bonding pad 142 is disposed at the center of the backside 120 , that is, the backside bonding pad 142 is located on the center line of the first short side edge and the second short side edge. Of course, those skilled in the art can arrange the back welding pads 142 at other positions on the back surface 120 as required, and any solutions that are the same as or similar to this embodiment are covered within the protection scope of the present invention.

The length of the back welding pad 142 is 3mm-30mm, and the width is 0.5mm-3mm. This numerical value is merely an example, and does not constitute a limitation of the present invention, and any solution that is the same as or similar to this embodiment is covered within the protection scope of the present invention.

Therefore, the present embodiment also provides a photovoltaic module, including several battery strings, each battery string including several strip-shaped cell sheets 100 stacked and connected at the edges by conductive glue, and two adjacent strip-shaped cell sheets 100 is connected by superimposing the short sides.

Specifically, the photovoltaic module is formed by connecting more than two strip-shaped cells 100 in series. Specifically, the front main grid 132 of the first strip-shaped cell 100 is connected to the rear main-grid 141 of the second strip-shaped cell 100 , the front main grid 132 of the second bar-shaped battery sheet 100 is connected with the rear main grid 141 of the third bar-shaped battery sheet 100 . . , the back welding pads 142 of the first strip-shaped battery sheet 100 and the last strip-shaped battery sheet 100 in the battery string are connected to the welding tape. Simple structure and convenient use.

7 and 8 show the solar cell sheet according to the second embodiment of the present invention.

The difference between the solar cell sheet of the present embodiment and the solar cell sheet of the first embodiment will be mainly described below.

In the first embodiment, the width of the auxiliary gate line 131 is not changed.

Referring to FIG. 7 , in this embodiment, preferably, the width of the auxiliary grid line 231 gradually decreases along the direction away from the front main grid 232 .

That is to say, the width of the auxiliary grid line 231 is gradual, and the width of the auxiliary grid line 231 is larger at the position close to the front main grid 232, which is between 0.5-3 mm. The width of the line 231 is small, between 0.01-0.2 mm.

It should be noted that this numerical value is only exemplary, and does not constitute a limitation to the present invention, and any solutions that are the same or similar to those of the present embodiment are covered within the protection scope of the present invention.

Therefore, on the auxiliary gate line 231 , the current is high at a position close to the front busbar 232 , and the current is low at a position far from the front busbar 232 . Therefore, the width gradient of the auxiliary grid line 231 can be matched with the change of the current, which further reduces the series resistance loss on the auxiliary grid line 231, improves the electrical performance of the battery, and also reduces the amount of silver paste.

Please refer to FIG. 8 , which is a partial enlarged view of the photovoltaic module according to the present invention, showing a schematic diagram of 10 columns (strings) of battery strings arranged in parallel. Due to space constraints, only the starting position of each column is shown in each column of battery strings. Two long strips of battery bars that overlap and connect to each other. Among these two battery bars, the front busbar of the lower battery bar is overlapped and connected to the back busbar of the back of the upper battery bar, so it is blocked, while the upper battery slice is overlapped and connected. The front main grid of the battery is connected and shielded by a bus bar 235. The bus bar 235 connects the starting ends of the 10 columns of battery strings in series, and makes the 10 columns of battery strings form a parallel relationship. Those skilled in the art know that the number of battery strings is not limited to 10, that is, in several battery strings, each N strings of battery strings are connected in parallel through the bus bar 235, and N is an integer not less than 4.

It is worth mentioning that, in the preferred embodiment of the present invention, if each battery bar 100 is obtained by dividing the solar cells 1000 into N equal parts, the bus bars 235 will be connected in parallel with N columns of battery strings. If the cells are divided into 5 equal parts, the bus bars will connect 5 battery strings in parallel; if the solar cells are divided into 6 equal parts, the bus bars will connect 6 battery strings in parallel.

In this embodiment, when the length of the long side of the battery bar 100 is N times the length of the short side (N is an integer not less than 4), the bus bar 235 connects N rows of battery strings in parallel.

It should be understood that although this specification is described in terms of embodiments, not every embodiment only includes an independent technical solution, and this description in the specification is only for the sake of clarity, and those skilled in the art should take the specification as a whole, and each The technical solutions in the embodiments can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

A series of detailed descriptions listed above are only specific descriptions for the feasible embodiments of the present invention, and they are not intended to limit the protection scope of the present invention. Any equivalents made without departing from the technical spirit of the present invention Embodiments or changes should all be included within the protection scope of the present invention.

Claims (16)

1. a kind of battery strip piece, the battery strip piece has long side and short side, it is characterised in that: the battery strip piece is just Face has the front main grid being arranged along short side edge.

2. battery strip piece as described in claim 1, it is characterised in that: the line width of the front main grid is 0.5mm to 3mm.

3. battery strip piece as described in claim 1, it is characterised in that: battery strip piece front is additionally provided with several use In the auxiliary grid line of the secondary grid line of collected current and the connection secondary grid line and the front main grid.

4. battery strip piece as claimed in claim 3, it is characterised in that: the length of the auxiliary grid line is front main grid length N times, N is integer not less than 4.

5. battery strip piece as claimed in claim 3, it is characterised in that: it is main that the line width of the auxiliary grid line is less than the front The line width of grid, and assisting the line width of grid line is 0.3mm to 2mm.

6. battery strip piece as claimed in claim 3, it is characterised in that: the pair grid line is parallel to the front main grid and sets It sets, the auxiliary grid line vertically connects the secondary grid line and front main grid.

7. battery strip piece as claimed in claim 6, it is characterised in that: the auxiliary grid line has one, and prolongs in short side Stretch the middle position for being located at the battery strip piece on direction.

8. battery strip piece as claimed in claim 6, it is characterised in that: the auxiliary grid line extends in battery strip piece short side At least two are arranged at intervals on direction, at least two auxiliary grid lines concatenate institute on battery strip piece long side extending direction There is secondary grid line.

9. battery strip piece as claimed in claim 6, it is characterised in that: the line width of the auxiliary grid line connects front main grid certainly One end be gradually reduced towards far from one end of front main grid.

10. battery strip piece as claimed in claim 9, it is characterised in that: assist grid line to be connected with front main grid one The line width at end is 0.5mm to 3mm, and the line width far from front main grid one end is 0.01 to 0.2mm.

11. the battery strip piece as described in any one of claims 1 to 10, it is characterised in that: the battery strip piece back The opposite side edges of face and the front main grid are provided with back side main grid.

12. battery strip piece as claimed in claim 11, it is characterised in that: the battery strip piece back side is additionally provided with the back side Welded gasket, the back side welded gasket is perpendicular to the back side main grid and the middle position of the battery strip piece is arranged in.

13. battery strip piece as claimed in claim 12, it is characterised in that: the line width of the back side welded gasket be 0.5mm extremely 3mm, wire length are 3mm to 30mm.

14. a kind of solar battery sheet, it is characterised in that: the solar battery sheet include integrally connected do not separated it is several Battery strip piece, the battery strip piece are arranged as described in any one of claim 1 to 13.

15. a kind of photovoltaic module, including several battery tandems, each battery tandem includes folded in edge by conducting resinl Add several battery strip pieces of connection, it is characterised in that: the battery strip piece is as described in any one of claim 1 to 13 Setting, and two neighboring battery strip piece is attached by the way of short side superposition.

16. photovoltaic module as claimed in claim 15, it is characterised in that: the long side length of the battery strip piece is that short side is long N times of degree, in several battery tandems, every N column battery tandem is connected in parallel by busbar realization, and N is not less than 4 Integer.