CN211828789U

CN211828789U - Photovoltaic module

Info

Publication number: CN211828789U
Application number: CN202020528863.7U
Authority: CN
Inventors: 潘秀娟; 董经兵; 许涛
Original assignee: CSI Cells Co Ltd; CSI Solar Power Group Co Ltd; Canadian Solar Manufacturing Changshu Inc
Current assignee: Canadian Solar Inc; CSI Cells Co Ltd; Canadian Solar Manufacturing Changshu Inc
Priority date: 2020-04-10
Filing date: 2020-04-10
Publication date: 2020-10-30
Anticipated expiration: 2030-04-10

Abstract

The utility model discloses a photovoltaic module, photovoltaic module includes: the first battery cell group, the second battery cell group and the third battery cell group respectively comprise a first battery cell and a second battery cell, and the first battery cell and the second battery cell are connected in parallel and are sequentially arranged along the serial arrangement direction; and the fourth battery cell group is connected with the third battery cell group in series and is arranged along the cell group arrangement direction, the fourth battery cell group comprises a third battery string and a fourth battery string, the third battery string and the fourth battery string are connected in parallel and are sequentially arranged along the cell group arrangement direction, each first battery string, each second battery string, each third battery string and each fourth battery string comprise a plurality of battery pieces, and the plurality of battery pieces are connected in series and are arranged along the cell group arrangement direction. According to the utility model discloses a photovoltaic module has changed the aspect ratio, has better anti-wind hole performance.

Description

Photovoltaic module

Technical Field

The utility model belongs to the technical field of the photovoltaic technique and specifically relates to a photovoltaic module is related to.

Background

The solar photovoltaic industry is a new energy industry that has developed very rapidly in recent years. In order to make the illumination effect of the photovoltaic module per unit area better, the photovoltaic module is usually installed at a certain angle with the ground. In the outdoor high wind speed area, the wind resistance born by the photovoltaic module is large, and the force of wind is large. In the related art, the wind tunnel resistance of the photovoltaic module is generally determined by the support, and the support bears a larger load, so that the wind tunnel resistance is poorer, and the stability of the photovoltaic module under the action of wind is poorer.

SUMMERY OF THE UTILITY MODEL

The utility model discloses aim at solving one of the technical problem that exists among the prior art at least. Therefore, an object of the utility model is to provide a photovoltaic module, photovoltaic module has better anti wind-tunnel performance, makes photovoltaic module stability under the effect of wind stronger.

According to the utility model discloses photovoltaic module, include: a first cell unit group, a second cell unit group, and a third cell unit group, the first cell unit group, the second cell unit group, and the third cell unit group being connected in series and arranged in sequence along a unit group arrangement direction perpendicular to a serial arrangement direction of the photovoltaic module, the first cell line, the second cell line, and the third cell line each include a first battery cell and a second battery cell, the first battery cell and the second battery cell are connected in parallel and are sequentially arranged along the series arrangement direction, the first battery unit includes two first battery strings connected in series and arranged in the cell group arrangement direction, the second battery unit comprises two second battery strings which are connected in series and are arranged along the arrangement direction of the unit group; a fourth cell unit, the fourth cell unit with third cell unit series connection just follows the unit group direction of arranging is arranged, the fourth cell unit includes third battery cluster and fourth battery cluster, the third battery cluster with fourth battery cluster parallel connection just follows the string direction of arranging is arranged in proper order, every first battery cluster, every the second battery cluster the third battery cluster with the fourth battery cluster all includes a plurality of battery pieces, and is a plurality of battery piece series connection just follows the string direction of arranging is arranged.

According to the utility model discloses photovoltaic module, through setting up the first battery cell group including first battery cell and second battery cell, second battery cell group and third battery cell group and including the fourth battery cell group of third battery cluster and fourth battery cluster, and make first battery cell include series connection, arrange two first battery clusters and second battery cell including series connection along the unit group direction of arranging, two second battery clusters of arranging along the unit group direction of arranging, photovoltaic module's circuit design is simple, and photovoltaic module's aspect ratio has been changed, photovoltaic module's width has been increased, make photovoltaic module have better anti-wind hole performance.

According to some embodiments of the present invention, in the cell group arrangement direction, the fourth cell group is located between the first cell group and the second cell group, or the fourth cell group is located between the second cell group and the third cell group.

According to some embodiments of the present invention, in the cell group arrangement direction, the fourth cell unit is located on one side of the second cell unit group away from the first cell unit group, or the fourth cell unit is located on one side of the second cell unit group away from the third cell unit group.

According to some embodiments of the invention, the first battery unit with between the second battery unit and the third battery cluster with be equipped with central busbar between the fourth battery cluster, central busbar follows the cell unit orientation of arranging extends.

According to some embodiments of the present invention, in the fourth cell group, one end of the center bus bar is kept away from the third cell string and one end of the center bus bar is kept away from the fourth cell string, and a lead bus bar is connected between the one ends.

According to some embodiments of the present invention, when the fourth cell unit is located at one side of the first cell unit away from the second cell unit or the fourth cell unit is located at one side of the third cell unit away from the second cell unit, the lead bus bars are located at all of one side of the cell units in the cell unit arrangement direction.

According to some embodiments of the utility model, the lead wire busbar with fourth battery cell group follows the direction of arranging of unit group is arranged, just the lead wire busbar with adjacent both sides all of battery cluster the equal interval of battery piece sets up.

According to some embodiments of the present invention, the central bus bar includes a first lead-out section, a second lead-out section and three central bus bar sections, the first lead-out section, the three central bus bar sections and the second lead-out section are sequentially arranged along the cell group arrangement direction, and two adjacent cell groups are connected in series by the central bus bar sections; the lead bus bar comprises a first sub lead bus bar and a second sub lead bus bar, one end of the first sub lead bus bar is connected with the central bus bar, the other end of the first sub lead bus bar is connected with one end, far away from the central bus bar, of the third battery string, one end of the second sub lead bus bar is connected with one of the first lead-out section, the three central bus bar sections and the second lead-out section, and the other end of the second sub lead bus bar is connected with one end, far away from the central bus bar, of the fourth battery string; in the first cell stack, the second cell stack, and the third cell stack, a first end bus bar is disposed on a side of the first cell unit away from the center bus bar, a second end bus bar is disposed on a side of the second cell unit away from the center bus bar, two first cell strings of the first cell unit are connected in series by the first end bus bar, and two second cell strings of the second cell unit are connected in series by the second end bus bar; in the fourth cell group, a third terminal bus bar is disposed on one side of the third cell string away from the center bus bar, a fourth terminal bus bar is disposed on one side of the fourth cell string away from the center bus bar, the third cell string is connected in series with the first sub lead bus bar through the third terminal bus bar, and the fourth cell string is connected in series with the second sub lead bus bar through the fourth terminal bus bar.

According to some embodiments of the present invention, when the lead bus bars are located on one side of all the cell groups in the cell group arrangement direction, the first lead-out section and the second lead-out section are respectively located on both sides of the photovoltaic module in the cell group arrangement direction, the first lead-out section is connected to both the first sub lead bus bar and the second sub lead bus bar and the first sub lead bus bar and the second sub lead bus bar are connected in parallel through the first lead-out section, the second lead-out section is connected to both the cell strings on the other side in the cell group arrangement direction and the two cell strings on the one side are connected in parallel through the second lead-out section, two adjacent cell strings of the cell group located on the center bus bar are connected in series through the center bus bar section between the two adjacent cell strings on the same side, two of the cell strings located on opposite sides of the center bus bar in the string arrangement direction are connected in parallel by the center bus bar segment.

According to some embodiments of the present invention, the first lead-out section is adjacent between the central bus bar sections, adjacent two between the central bus bar sections, and the second lead-out section is adjacent to be equipped with between the central bus bar sections respectively with corresponding the reverse parallelly connected bypass diode of battery cell group.

According to some embodiments of the present invention, the photovoltaic module further comprises a plurality of junction boxes, each of which is provided with one of the bypass diodes in the junction box.

According to the utility model discloses a some embodiments, it is a plurality of the terminal box all is located photovoltaic module the cluster is arranged ascending middle part of side, and follows the unit group direction of arranging is located same straight line.

According to some embodiments of the present invention, the width of the photovoltaic module is w, the length of the photovoltaic module is l, wherein w, l satisfy respectively: w is more than or equal to 1150mm and less than or equal to 1520mm, and l is more than or equal to 1950mm and less than or equal to 2600 mm.

According to some embodiments of the utility model, every the battery piece is the half of complete battery piece, every the length direction of battery piece does the direction is arranged to the unit group, every the width direction of battery piece does the cluster direction of arranging.

According to the utility model discloses a some embodiments, every first battery cluster, every the second battery cluster the third battery cluster with the fourth battery cluster the number of battery piece is N, wherein N satisfies: n is more than or equal to 10 and less than or equal to 12.

According to the utility model discloses a some embodiments, every first battery cluster, every the second battery cluster third battery cluster with the fourth battery cluster the number of battery piece equals.

According to some embodiments of the present invention, each of the length of the battery piece is L, wherein L satisfies: l is more than or equal to 156mm and less than or equal to 210 mm.

According to the utility model discloses a some embodiments, the clearance between two adjacent battery pieces in every battery string is d, wherein d satisfies: d is more than or equal to 0mm and less than or equal to 3 mm.

According to some embodiments of the invention, d further satisfies: d is more than or equal to 0.5mm and less than or equal to 0.9 mm.

According to some embodiments of the invention, the photovoltaic module comprises: a battery string layer including the first cell stack, the second cell stack, the third cell stack, and the fourth cell stack; the back plate is arranged on the back surface of the battery string layer; the frame is arranged at the edges of the battery string layer and the backboard; the support rods are arranged on one side, far away from the battery string layer, of the back plate, the support rods are arranged along the length direction of the photovoltaic module at intervals, and two ends of each support rod are connected with two long edges of the frame respectively.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

fig. 1 is a schematic circuit diagram of a photovoltaic module according to an embodiment of the present invention;

fig. 2 is a schematic circuit diagram of a photovoltaic module according to another embodiment of the present invention;

fig. 3 is a schematic front structural view of a photovoltaic module according to an embodiment of the present invention;

fig. 4 is a back structural schematic diagram of a photovoltaic module according to the embodiment of the present invention.

Reference numerals:

100: a photovoltaic module;

1: a first cell group; 11: a first battery cell; 111: a first battery string;

1111: a battery piece; 112: a first end bus bar; 12: a second battery cell;

121: a second battery string; 122: a second end bus bar; 2: a second cell group;

3: a third cell group; 4: a fourth cell group; 41: a third battery string;

411: a lead bus bar; 4111: a first sub-lead bus bar; 4112: a second sub-lead bus bar;

412: a third end bus bar; 42: a fourth battery string; 421: a fourth end bus bar;

5: a center bus bar; 51: a first lead-out section; 52: a second lead-out section; 53: a central bus bar segment;

6: a bypass diode; 7: a junction box; 8: a back plate; 9: a frame; 10: a support rod.

Detailed Description

Embodiments of the present invention are described in detail below, and the embodiments described with reference to the drawings are exemplary.

A photovoltaic module 100 according to an embodiment of the present invention is described below with reference to fig. 1-4.

As shown in fig. 1 and 2, a photovoltaic module 100 according to an embodiment of the present invention includes a first cell unit group 1, a second cell unit group 2, a third cell unit group 3, and a fourth cell unit group 4.

Specifically, the first cell stack 1, the second cell stack 2, and the third cell stack 3 are connected in series and arranged in sequence along a cell stack arrangement direction perpendicular to the series arrangement direction of the photovoltaic module 100. The first battery cell group 1, the second battery cell group 2, and the third battery cell group 3 each include a first battery cell 11 and a second battery cell 12, the first battery cell 11 and the second battery cell 12 are connected in parallel and sequentially arranged along the cell group arrangement direction, the first battery cell 11 includes two first battery strings 111, the two first battery strings 111 are connected in series and arranged along the cell group arrangement direction, the second battery cell 12 includes two second battery strings 121, and the two second battery strings 121 are connected in series and arranged along the cell group arrangement direction.

Here, it should be noted that the "string arrangement direction" may be understood as an arrangement direction (e.g., an up-down direction in fig. 1 and 2) of the plurality of cell pieces 1111 in the cell string such as the first cell string 111, and the "cell group arrangement direction" may be a direction (e.g., a left-right direction in fig. 1 and 2) perpendicular to the arrangement direction of the plurality of cell pieces 1111 in the cell string such as the first cell string 111.

The fourth cell unit group 4 is connected in series with the third cell unit group 3 and is arranged along the unit group arrangement direction, the fourth cell unit group 4 includes a third cell string 41 and a fourth cell string 42, the third cell string 41 and the fourth cell string 42 are connected in parallel and are arranged in sequence along the string arrangement direction, each of the first cell string 111, each of the second cell string 121, the third cell string 41 and the fourth cell string 42 includes a plurality of battery pieces 1111, and the plurality of battery pieces 1111 are connected in series and are arranged along the string arrangement direction. In the description of the present invention, "a plurality" means two or more.

For example, in the example of fig. 1 and 2, the photovoltaic module 100 may be divided into upper and lower portions, and the upper and lower portions may be completely symmetrical. Specifically, the photovoltaic module 100 includes at least four cell lines connected in series, i.e., a first cell line 1, a second cell line 2, a third cell line 3, and a fourth cell line 4.

The first cell stack 1, the second cell stack 2, the third cell stack 3, and the fourth cell stack 4 are arranged along the short side of the photovoltaic module 100. Each of the first cell group 1, the second cell group 2, and the third cell group 3 includes a first battery cell 11 and a second battery cell 12 connected in parallel and arranged along the long side of the photovoltaic module 100. The photovoltaic module 100 comprises fourteen cell strings, wherein each first cell unit 11 comprises two first cell strings 111 connected in series and arranged along the short side of the photovoltaic module 100, and each second cell unit 12 comprises two second cell strings 121 connected in series and arranged along the short side of the photovoltaic module 100. The fourth cell group 4 includes a third cell string 41 and a fourth cell string 42 connected in parallel and arranged along the long side of the photovoltaic module 100.

The plurality of cell pieces 1111 of each of the first cell string 111, the second cell string 121, the third cell string 41, and the fourth cell string 42 may linearly extend along the long side of the photovoltaic module 100. The upper surfaces of all the cell units (i.e., the first cell unit 1, the second cell unit 2, the third cell unit 3, and the fourth cell unit 4) of the photovoltaic module 100 may be provided with a cover plate, the lower surfaces may be provided with a back plate, and the edges of the cover plate, the back plate, and all the cell units may be provided with a frame. Alternatively, the cover plate may be glass. During installation, the photovoltaic module 100 is fixed on a bracket (not shown). From this, through the aforesaid setting, photovoltaic module 100's circuit design is simple, moreover, to battery piece 1111 with the size, compare with current photovoltaic module, has changed photovoltaic module 100's aspect ratio, has increased photovoltaic module 100's width to make the bearing of support on unit area littleer, make photovoltaic module 100 have better anti-wind tunnel performance, stability is stronger under the effect of wind, and is more reliable. In addition, the photovoltaic module 100 arranged in this way has smaller strength requirement on the support, and the cost of the support can be reduced.

According to the utility model discloses photovoltaic module 100, through setting up first battery cell group 1 including first battery cell 11 and second battery cell 12, second battery cell group 2 and third battery cell group 3 and including third battery cluster 41 and fourth battery cell group 4 of 42, and make first battery cell 11 include series connection, arrange two first battery clusters 111 and second battery cell 12 including series connection along the unit group direction of arranging, two second battery clusters 121 of arranging along the unit group direction, photovoltaic module 100's circuit design is simple, and the aspect ratio of photovoltaic module 100 has been changed, photovoltaic module 100's width has been increased, make photovoltaic module 100 have better anti-wind hole performance.

In some optional embodiments of the present invention, referring to fig. 1, in the cell group arrangement direction, the fourth cell unit 4 may be located between the first cell unit 1 and the second cell unit 2, or the fourth cell unit 4 may be located between the second cell unit 2 and the third cell unit 3. For example, in the example of fig. 1, the fourth cell group 4 is located between the first cell group 1 and the second cell group 2 in the short side direction of the photovoltaic module 100. So set up, fourth battery unit group 4 can be located photovoltaic module 100's intermediate position, and third battery cluster 41 and fourth battery cluster 42 correspond with the box body part of terminal box 7, because the size of the battery piece 1111 in third battery cluster 41 or fourth battery cluster 42 is greater than the size of terminal box 7, consequently has sufficient space installation terminal box 7, when guaranteeing that photovoltaic module 100 has higher efficiency, is favorable to reducing photovoltaic module 100's occupation space, reduce cost.

Of course, the utility model discloses be not limited to this, the position of fourth unit group can be specifically adjusted according to actual need to satisfy practical application better. In other optional embodiments of the present invention, referring to fig. 2, in the cell group arrangement direction, the fourth cell unit 4 may be located on one side of the first cell unit 1 away from the second cell unit 2, or the fourth cell unit 4 may be located on one side of the third cell unit 3 away from the second cell unit 2. For example, in the example of fig. 2, the fourth cell group 4 is located on the side of the first cell group 1 away from the second cell group 2 in the short side direction of the photovoltaic module 100. At this time, since the edge junction box 7 needs to have a positive electrode lead or a negative electrode lead, a bending space of the positive electrode lead or the negative electrode lead needs to be reserved. Therefore, the width of the photovoltaic module 100 is relatively increased (for example, increased by 50mm), and the wind tunnel resistance of the photovoltaic module 100 can be further improved.

In some embodiments of the present invention, as shown in fig. 1 and 2, a center bus bar 5 is provided between the first battery unit 11 and the second battery unit 12 and between the third battery string 41 and the fourth battery string 42, and the center bus bar 5 extends along the cell group arrangement direction. Therefore, by arranging the central bus bar 5, the central bus bar 5 can realize parallel connection between the first battery unit 11 and the second battery unit 12 and between the third battery string 41 and the fourth battery string 42, which is beneficial to reducing the difficulty of design and process and has a simple structure.

In a further embodiment of the present invention, referring to fig. 1-3, in the fourth cell group 4, a lead bus bar 411 is connected between one end of the third cell string 41, which is far from the center bus bar 5, and one end of the fourth cell string 42, which is far from the center bus bar 5. Thus, by providing the lead bus bar 411, the lead bus bar 411 may be used to transmit current without affecting the overall footprint of the cell 1111.

In some embodiments of the present invention, in combination with fig. 2, when the fourth cell unit 4 is located on one side of the first cell unit 1 away from the second cell unit 2 or the fourth cell unit 4 is located on one side of the third cell unit 3 away from the second cell unit 2, the lead bus bar 411 is located on one side of all the cell units in the unit arrangement direction.

For example, in the example of fig. 2, the fourth cell stack 4 is located on the side of the first cell stack 1 away from the second cell stack 2 in the short side direction of the photovoltaic module 100, with the lead bus bar 411 located between the third cell string 41 and the left edge of the glass. Like this, lead bus bar 411 can set up outside battery piece 1111, and it can intersect with battery piece 1111, can not influence the normal work of photovoltaic module 100, and does not have the influence to the whole occupation space of battery piece 1111 to and lead bus bar 411 and center bus bar 5 can form in same process step, and then reach the beneficial effect of simplifying process step.

In some optional embodiments of the present invention, as shown in fig. 1 and fig. 2, the lead bus bar 411 and the fourth cell unit group 4 are arranged along the unit group arrangement direction, and the 4-lead bus bar 411 is arranged at an interval with all 1111 cells of the cell strings on two adjacent sides.

For example, in the example of fig. 1-3, in the fourth cell group 4, a lead bus bar 411 is connected between the upper end of the third cell string 41 and the lower end of the fourth cell string 42. The lead bus bar 411 has current flowing through it, and a certain space is reserved for placing the lead bus bar 411 during the layout process of the photovoltaic module 100, where the lead bus bar 411 is equivalent to a string of cells in the photovoltaic module 100. The photovoltaic module 100 may not need to be disposed on the back surface of the cell 1111, and may not have an overlapping region with the cell 1111, and may not need to be provided with an insulating layer. From this, through making lead bus bar 411 and all battery slices 1111 of the battery cluster of adjacent both sides all interval set up, can avoid the condition such as short circuit, electric leakage, compare with the circuit design of current photovoltaic module 100, the lead bus bar 411 that so sets up can need not to set up the insulating layer, and the processing procedure is simplified greatly, has saved complicated lead bus bar 411 and has laid and insulating process to can avoid because of setting up the lead bus bar 411 of insulating layer and correspond the problem of easy fragmentation under lamination and the load condition of the region of battery slice 1111.

In some embodiments of the present invention, referring to fig. 1 to 3, the central bus bar 5 includes a first leading-out section 51, a second leading-out section 52 and three central bus bar sections 53, the first leading-out section 51, the three central bus bar sections 53 and the second leading-out section 52 are sequentially arranged along the cell group arrangement direction, and two adjacent cell groups are connected in series through the central bus bar sections 53. So, draw forth section 52 and three central busbar section 53 through setting up foretell first drawing segment 51, second, can realize establishing ties between first battery cell group 1, second battery cell group 2, third battery cell group 3 and the fourth battery cell group 4, be favorable to reducing the design and the technology degree of difficulty, and simple structure, it is less to photovoltaic module 100's normal work influence.

The lead bus bar 411 includes a first sub-lead bus bar 4111 and a second sub-lead bus bar 4112, one end of the first sub-lead bus bar 4111 is connected to the center bus bar 5 and the other end is connected to one end of the third cell string 41, which is far from the center bus bar 5, one end of the second sub-lead bus bar 4112 is connected to one of the first lead-out section 51, the three center bus bar sections 53, and the second lead-out section 52, and the other end is connected to one end of the fourth cell string 42, which is far from the center bus bar 5.

For example, in the example of fig. 1-3, the third cell string 41 is connected in series with the first sub-lead busbar 4111, and the third cell string 41 and the first sub-lead busbar 4111 are aligned along a short side of the photovoltaic module 100. The fourth cell string 42 is connected in series with the second sub-lead bus 4112, and the fourth cell string 42 and the second sub-lead bus 4112 are arranged along the short side of the photovoltaic module 100.

As shown in fig. 3, in the first cell stack 1, the second cell stack 2, and the third cell stack 3, a first end bus bar 112 is provided on a side of the first battery cell 11 away from the center bus bar 5, a second end bus bar 122 is provided on a side of the second battery cell 12 away from the center bus bar 5, two first battery strings 111 of the first battery cell 11 are connected in series by the first end bus bar 112, and two second battery strings 121 of the second battery cell 12 are connected in series by the second end bus bar 122. In the fourth cell group 4, the third cell string 41 is provided with a third end bus bar 412 on the side away from the center bus bar 5, the fourth cell string 42 is provided with a fourth end bus bar 421 on the side away from the center bus bar 5, the third cell string 41 is connected in series with the first sub lead bus bar 4111 via the third end bus bar 412, and the fourth cell string 42 is connected in series with the second sub lead bus bar 4112 via the fourth end bus bar 421.

Thus, by providing the first, second, third and fourth end bus bars 112, 122, 412 and 421, the series connection between two first cell strings 111 and two second cell strings 121, between the third cell string 41 and the first sub-lead bus bar 4111, and between the fourth cell string 42 and the second sub-lead bus bar 4112 in the first, second and

third cell groups

1, 2 and 3 can be achieved, and the currents of the first, second, third and

fourth cell groups

1, 2, 3 and 4 can be collected.

In a further embodiment of the present invention, referring to fig. 2 and 4, when the lead bus bar 411 is located at one side of all cell stacks in the cell stack arrangement direction, the first lead-out section 51 and the second lead-out section 52 are located at both sides of the photovoltaic module 100 in the cell stack arrangement direction, respectively, the first lead-out section 51 is connected to both the first sub lead bus bar 4111 and the second sub lead bus bar 4112, the first sub lead bus bar 4111 and the second sub lead bus bar 4112 are connected in parallel via the first lead-out section 51, the second lead-out section 52 is connected to both cell strings at the other side in the cell stack arrangement direction, the two cell strings at the one side are connected in parallel via the second lead-out section 52, the two adjacent cell strings at the same side of the center bus bar 5 are connected in series via the center bus bar section 53, the two adjacent cell strings are connected in series via the string arrangement direction, The two cell strings located on opposite sides of the center bus bar 5 are connected in parallel by a center bus bar segment 53.

For example, in the example of fig. 2, the fourth cell stack 4 is located on the side of the first cell stack 1 remote from the second cell stack 2, the lead bus bar 411 is located on the leftmost side of all of the cell stacks, and one of the two first cell strings 111 and one of the two second cell strings 121 in the third cell stack 3 are located on the rightmost side of all of the cell stacks. For convenience of description, one of the two first battery strings 111 of the third battery cell group 3 located at the rightmost side of all the battery cell groups will be described as a "first edge battery string", and one of the two second battery strings 121 of the third battery cell group 3 located at the rightmost side of all the battery cell groups will be described as a "second edge battery string", hereinafter.

The first lead-out section 51 and the second lead-out section 52 are respectively located on both sides in the short-side direction of the photovoltaic module 100. The second lead-out section 52 is connected to both the first edge cell string and the second edge cell string, and the first edge cell string and the second edge cell string are connected in parallel through the second lead-out section 52. The third battery string 41 is connected in series with the first battery string 111 on the left side in the first cell stack 1 through the central bus bar segment 53, the fourth battery string 42 is connected in series with the second battery string 121 on the left side in the first cell stack 1 through the central bus bar segment 53, and the third battery string 41 and the fourth battery string 42 are connected in parallel through the central bus bar segment 53, the first battery string 111 on the left side in the first cell stack 1 and the second battery string 121 on the left side in the first cell stack 1 are connected in parallel through the central bus bar segment 53; the first battery string 111 on the right in the first cell stack 1 and the first battery string 111 on the left in the second cell stack 2 are connected in series by the central bus bar segment 53, the second battery string 121 on the right in the first cell stack 1 and the second battery string 121 on the left in the second cell stack 2 are connected in series by the central bus bar segment 53, the first battery string 111 on the right in the first cell stack 1 and the second battery string 121 on the right in the first cell stack 1 are connected in parallel by the central bus bar segment 53, and the first battery string 111 on the left in the second cell stack 2 and the second battery string 121 on the left in the second cell stack 2 are connected in parallel by the central bus bar segment 53; the first battery string 111 on the right in the second cell stack 2 and the first battery string 111 on the left in the third cell stack 3 are connected in series by the central bus bar segment 53, the second battery string 121 on the right in the second cell stack 2 and the second battery string 121 on the left in the third cell stack 3 are connected in series by the central bus bar segment 53, the first battery string 111 on the right in the second cell stack 2 and the second battery string 121 on the right in the second cell stack 2 are connected in parallel by the central bus bar segment 53, and the first battery string 111 on the left in the third cell stack 3 and the second battery string 121 on the left in the third cell stack 3 are connected in parallel by the central bus bar segment 53.

Therefore, the series connection among the battery cell groups and the parallel connection between the two battery strings which are positioned on the opposite sides of the central bus bar 5 in the string arrangement direction can be well realized, the structure is simple, and the design and process difficulty is low.

In some embodiments of the present invention, referring to fig. 1 and 2, bypass diodes 6 connected in anti-parallel with corresponding cell groups are respectively provided between the first lead-out section 51 and the adjacent central bus bar section 53, between the two adjacent central bus bar sections 53, and between the second lead-out section 52 and the adjacent central bus bar section 53. Therefore, by providing the bypass diode 6, a bypass function can be realized when the battery strings in the first battery cell group 1, the second battery cell group 2, the third battery cell group 3 or the fourth battery cell group 4 are shielded by a shadow, so that the photovoltaic module 100 is prevented from being damaged by overheating.

In a further embodiment of the present invention, as shown in fig. 4, the photovoltaic module 100 further includes a plurality of junction boxes 7, and a bypass diode 6 is disposed in each junction box 7. For example, four terminal blocks 7 are shown in the example of fig. 4. Thus, by providing the junction box 7, the electric power generated by the photovoltaic module 100 can be connected to an external line, and the electric current generated by the photovoltaic module 100 can be conducted.

Alternatively, referring to fig. 4, the plurality of junction boxes 7 may be located at the middle of the photovoltaic module 100 in the string arrangement direction and on the same straight line along the cell group arrangement direction. Therefore, the structure is simple, the processing is convenient, the process steps can be simplified, and the appearance is more attractive.

In some embodiments of the present invention, the width of the photovoltaic module 100 is w, and the length of the photovoltaic module 100 is l, wherein w and l satisfy: w is more than or equal to 1150mm and less than or equal to 1520mm, and l is more than or equal to 1950mm and less than or equal to 2600 mm. Specifically, for example, when the cell piece 1111 is 156mm in size, the length l of the photovoltaic module 100 may be 1950mm, and the width w of the photovoltaic module 100 may be 1150 mm; when the cell piece 1111 is 166mm in size, the length l of the photovoltaic module 100 may be 2100mm, and the width w of the photovoltaic module 100 may be 1250 mm; when cell 1111 is 210mm in size, the length l of photovoltaic module 100 may be approximately 2600mm and the width w of photovoltaic module 100 may be approximately 1150 mm. Wherein, the preferable range of the length l of the photovoltaic module 100 is 1950mm & lt/l & lt 2100mm, and the preferable range of the width w of the photovoltaic module 100 is 1150mm & lt/w & lt/1250 mm.

Alternatively, each of the battery pieces 1111 may be one-half of a complete battery piece (not shown), the length direction of each of the battery pieces 1111 is the cell group arrangement direction, and the width direction of each of the battery pieces 1111 is the string arrangement direction. Therefore, compared with the use of a whole cell, the internal loss of the photovoltaic module 100 can be reduced, and by adopting the circuit connection form of the embodiment, the current of each cell string is reduced to be one half of the output current of the whole cell, and then the cell strings are connected in parallel, so that the output current of the photovoltaic module 100 is still the same as the output current when the whole cell is adopted, the voltage reduction caused by the adoption of the half cell 1111 is avoided, and meanwhile, the internal loss can be reduced due to the current of the half cell 1111, so that the output power of the photovoltaic module 100 is improved, and the reduction of the cost of a single watt is facilitated.

Of course, those skilled in the art will appreciate that the battery piece 1111 is not limited to being one-half of the complete battery piece, for example, the battery piece 1111 may also be one-third or one-fourth of the complete battery piece.

Alternatively, referring to fig. 1 and 2, the number of the battery slices 1111 of each first battery string 111, each second battery string 121, each third battery string 41 and each fourth battery string 42 is N, where N satisfies: n is more than or equal to 10 and less than or equal to 12. Specifically, since the conventional diode is limited by the reverse voltage withstanding capability thereof, the number of the battery slices 1111 that can be protected at most does not exceed 24, and the number of the battery slices 1111 in each battery string needs to be matched according to the bypass diode, so as to avoid the situation that the voltage of the battery slices 1111 in each battery string is too high due to too many battery slices 1111, which causes the risk of breakdown of the bypass diode, and therefore, the number N of the battery slices 1111 in each battery string satisfies: n is more than or equal to 10 and less than or equal to 12, the safety of the diode can be bypassed, and the hot spot effect can be reduced.

N-12 is shown in fig. 1 and fig. 2 for illustrative purposes, but it is obvious to those skilled in the art after reading the technical solution of the present application that the solution can be applied to other numbers of battery slices 1111, which also falls within the protection scope of the present invention. It is understood that the number of the battery slices 1111 of each battery string can be specifically set according to actual requirements to better meet the actual application.

Alternatively, as shown in fig. 1 and 2, the number of the battery pieces 1111 of each of the first battery string 111, the second battery string 121, the third battery string 41, and the fourth battery string 42 is equal. For example, in the example of fig. 1 and 2, the photovoltaic module 100 is in an up-down symmetrical structure. Thus, the photovoltaic module 100 has a simple structure, is convenient to operate, and has high appearance attractiveness.

Optionally, each cell 1111 has a length L, where L satisfies: l is more than or equal to 156mm and less than or equal to 210 mm. For example, each cell 1111 may be cut from a complete cell, the complete cell may be a square silicon wafer, the side length of the square silicon wafer is L, and the length of each cell 1111 is the long side dimension of the cell 1111. Thus, by making L satisfy: l is more than or equal to 156mm and less than or equal to 210mm, and the battery piece 1111 can be ensured to have a larger light receiving area, so that the power can be improved, and the manufacturing cost per watt can be reduced.

Optionally, a gap between two adjacent battery pieces in each battery string is d, where d satisfies: d is more than or equal to 0mm and less than or equal to 3 mm. Therefore, the gaps between every two adjacent battery pieces are small, all the battery pieces in the photovoltaic module can be regularly and tightly arranged, on one hand, the electric connection between the adjacent battery pieces is convenient, and on the other hand, the reduction of the occupied space of the whole photovoltaic module is facilitated. Wherein d further satisfies: d is more than or equal to 0.5mm and less than or equal to 0.9 mm.

In some embodiments of the present invention, in conjunction with fig. 3 and 4, photovoltaic module 100 includes a battery string layer, a back plate 8, a frame 9, and a plurality of support rods 10.

Specifically, the battery string layer includes a first cell stack 1, a second cell stack 2, a third cell stack 3, and a fourth cell stack 4. The back plate 8 is arranged on the back of the battery string layer. The frame 9 is arranged at the edge of the battery string layer and the backboard 8. The plurality of support rods 10 are arranged on one side of the back plate 8 far away from the battery string layer, the plurality of support rods 10 are arranged at intervals along the length direction of the photovoltaic module 100, and two ends of each support rod 10 are connected with two long edges of the frame 9 respectively.

For example, in the example of fig. 4, two support bars 10 are shown, the two support bars 10 being parallel to each other and to the short sides of the frame 9, the two support bars 10 being arranged spaced apart from each other between the two short sides of the frame 9. The two support bars 10 and the two long sides of the frame 9 define an accommodation space in which the junction box 7 is located. Alternatively, the back plate 8 may be glass. Therefore, by providing the plurality of support rods 10, the plurality of support rods 10 can well support the photovoltaic module 100, the structural stability of the whole photovoltaic module 100 can be improved, and the wind pressure resistance of the photovoltaic module 100 can be improved.

A photovoltaic module 100 according to various embodiments of the present invention is described below with reference to fig. 1-3.

In the first embodiment, the first step is,

in the present embodiment, as shown in fig. 1 and 3, a circuit connection schematic diagram of the photovoltaic module 100 is shown in fig. 1. The photovoltaic module 100 is divided into an upper part and a lower part, and the upper part and the lower part are of a completely symmetrical structure. A first cell group 1, a fourth cell group 4, a second cell group 2, and a third cell group 3 connected in series are sequentially disposed along the short side direction of the photovoltaic module 100.

The first cell stack 1, the second cell stack 2, and the third cell stack 3 each include a first battery cell 11 and a second battery cell 12, and the first battery cell 11 and the second battery cell 12 are connected in parallel and arranged along the long side of the photovoltaic module 100. The first cell unit 11 includes two first cell strings 111 connected in series and arranged along the short side of the photovoltaic module 100, and the second cell unit 12 includes two second cell strings 121 connected in series and arranged along the short side of the photovoltaic module 100.

The fourth cell group 4 includes a third cell string 41 and a fourth cell string 42 connected in parallel and arranged along the long side of the photovoltaic module 100, and a lead bus bar 411 is connected between the upper end of the third cell string 41 and the lower end of the fourth cell string 42. The lead bus bar 411 includes a first sub-lead bus bar 4111 and a second sub-lead bus bar 4112 connected in parallel and arranged along a long side of the photovoltaic module 100. The third cell string 41 is connected in series with the first sub-lead bus 4111, and the third cell string 41 and the first sub-lead bus 4111 are arranged along the short side of the photovoltaic module 100. The fourth cell string 42 is connected in series with the second sub-lead bus 4112, and the fourth cell string 42 and the second sub-lead bus 4112 are arranged along the short side of the photovoltaic module 100. The first sub-lead bus bar 4111 is located between the third cell string 41 and the second cell group 2, and the first sub-lead bus bar 4111 is spaced apart from the cell tab 1111 of the third cell string 41 and the cell tab 1111 of the second cell group 2; the second sub-lead bus bar 4112 is positioned between the fourth cell string 42 and the second cell group 2, and the second sub-lead bus bar 4112 is spaced apart from the cell tab 1111 of the fourth cell string 42 and the cell tab 1111 of the second cell group 2, so as to prevent short circuit and leakage current.

Each of the first cell string 111, each of the second cell string 121, the third cell string 41, and the fourth cell string 42 includes twelve cell pieces 1111, and the entire photovoltaic module 100 includes one hundred sixty eight cell pieces 1111 in total. Each cell 1111 is one-half of a complete cell. A total of four bypass diodes 6 are provided in the photovoltaic module 100. Correspondingly, the corresponding junction box 7 may be provided as four individual junction boxes 7 (as shown in fig. 4), each of which is provided with a bypass diode 6. The photovoltaic module 100 is of an up-down symmetrical structure, and the upper half part and the lower half part of the photovoltaic module 100 respectively comprise seven battery strings. Specifically, for example, in the case of the same power and the same number of cells in the entire model, if the upper half portion and the lower half portion respectively include five strings of cells, and the number of cells included in each string of cells is large, for example, if the entire photovoltaic module also includes one hundred sixty eight cells, and each cell is half of a complete cell, fourteen cells are included in each string for the photovoltaic module in which the upper half portion and the lower half portion respectively include five strings of cells, and if two adjacent strings are connected in parallel with one diode, the number of cells protected by a single diode is twenty-eight, which exceeds twenty-four, increases the risk of hot spot effect, and the long side of the photovoltaic module becomes long, resulting in an increase in the aspect ratio of the photovoltaic module. To solve the hot spot problem, one diode per single series-parallel connection is required. At the moment, six jumper wires exist in the whole circuit, and the laying of the six jumper wires increases great difficulty for the component manufacturing process.

If the number of diode protection cells of the photovoltaic module in which the upper half portion and the lower half portion respectively include five strings of cells and the photovoltaic module in which the upper half portion and the lower half portion respectively include seven strings of cells is the same, the output power is lower for the photovoltaic module in which the upper half portion and the lower half portion respectively include five strings of cells.

Therefore, compared with the design of the existing photovoltaic module, the design of the existing photovoltaic module ensures that no hot spot effect is generated, and simultaneously, six bus bars provided with insulating layers are cancelled, instead, the six bus bars are changed into two bus bars without insulating layers (namely the first sub-lead bus bar 4111 and the second sub-lead bus bar 4112), the manufacturing process is greatly simplified, the complex bus bar laying and insulating process is omitted, and the problem that the bus bars provided with the insulating layers are easy to crack under the conditions of lamination and load corresponding to the cell area can be avoided. Meanwhile, the arrangement of the diodes is also reduced from six diodes to four diodes, and the cost is also reduced to a certain extent. In addition, the photovoltaic module 100 is wider and shorter in size than the prior art symmetrical layout design, for example, the width is increased by more than 16% and the length is reduced by more than 4%. For a system end, the lower support bearing per unit area is smaller, the requirement on the strength of the support is smaller, the cost of the corresponding support can be reduced, and the lower support has better wind tunnel resistance and better reliability.

In the second embodiment, the first embodiment of the method,

as shown in fig. 2 and 3, the present embodiment has substantially the same structure as the first embodiment, wherein the same reference numerals are used for the same components, except that: the fourth cell stack 4 is located on the side of the first cell stack 1 remote from the second cell stack 2 (e.g., the left side in fig. 2). At this time, the fourth cell group 4 corresponds to the edge junction box 7, and with reference to fig. 2, the edge junction box 7 corresponding to the fourth cell group 4 has a positive electrode lead, and a positive electrode lead bending space needs to be reserved. Therefore, the width of the photovoltaic module 100 is relatively increased (for example, increased by 50mm), and the wind tunnel resistance of the photovoltaic module 100 can be further improved.

The photovoltaic module 100 of the present embodiment is similar to the photovoltaic module 100 of the first embodiment in other structures, and therefore, will not be described in detail herein.

Other constructions and operations of the photovoltaic module 100 according to embodiments of the present invention are known to those of ordinary skill in the art and will not be described in detail herein.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present invention.

In the description of the present invention, "the first feature" and "the second feature" may include one or more of the features.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example.

While embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A photovoltaic module, comprising:

a first cell unit group, a second cell unit group, and a third cell unit group, the first cell unit group, the second cell unit group, and the third cell unit group being connected in series and arranged in sequence along a unit group arrangement direction perpendicular to a serial arrangement direction of the photovoltaic module, the first cell line, the second cell line, and the third cell line each include a first battery cell and a second battery cell, the first battery cell and the second battery cell are connected in parallel and are sequentially arranged along the series arrangement direction, the first battery unit includes two first battery strings connected in series and arranged in the cell group arrangement direction, the second battery unit comprises two second battery strings which are connected in series and are arranged along the arrangement direction of the unit group;

a fourth cell unit, the fourth cell unit with third cell unit series connection just follows the unit group direction of arranging is arranged, the fourth cell unit includes third battery cluster and fourth battery cluster, the third battery cluster with fourth battery cluster parallel connection just follows the string direction of arranging is arranged in proper order, every first battery cluster, every the second battery cluster the third battery cluster with the fourth battery cluster all includes a plurality of battery pieces, and is a plurality of battery piece series connection just follows the string direction of arranging is arranged.

2. The photovoltaic module according to claim 1, wherein, in the cell group arrangement direction,

the fourth cell line is located between the first cell line and the second cell line, or the fourth cell line is located between the second cell line and the third cell line.

3. The photovoltaic module according to claim 1, wherein, in the cell group arrangement direction,

the fourth cell line is located at one side of the first cell line, which is far away from the second cell line, or the fourth cell line is located at one side of the third cell line, which is far away from the second cell line.

4. The photovoltaic module according to any one of claims 1 to 3, wherein a center bus bar is provided between the first cell unit and the second cell unit and between the third cell string and the fourth cell string, the center bus bar extending in the cell group arrangement direction.

5. The photovoltaic module according to claim 4, wherein in the fourth cell group, a lead bus bar is connected between an end of the third cell string remote from the center bus bar and an end of the fourth cell string remote from the center bus bar.

6. The photovoltaic module according to claim 5, wherein when the fourth cell stack is positioned on a side of the first cell stack remote from the second cell stack or the fourth cell stack is positioned on a side of the third cell stack remote from the second cell stack,

the lead bus bars are located at one side of all the cell groups in the cell group arrangement direction.

7. The pv module according to claim 5 wherein the lead bus bars and the fourth cell group are arranged along the cell group arrangement direction, and the lead bus bars are spaced from all of the cells of the adjacent cell strings on both sides.

8. The photovoltaic module according to claim 5, wherein the central bus bar includes a first lead-out section, a second lead-out section, and three central bus bar sections, the first lead-out section, the three central bus bar sections, and the second lead-out section are sequentially arranged along the cell group arrangement direction, and two adjacent cell groups are connected in series by the central bus bar sections;

the lead bus bar comprises a first sub lead bus bar and a second sub lead bus bar, one end of the first sub lead bus bar is connected with the central bus bar, the other end of the first sub lead bus bar is connected with one end, far away from the central bus bar, of the third battery string, one end of the second sub lead bus bar is connected with one of the first lead-out section, the three central bus bar sections and the second lead-out section, and the other end of the second sub lead bus bar is connected with one end, far away from the central bus bar, of the fourth battery string;

in the first cell stack, the second cell stack, and the third cell stack, a first end bus bar is disposed on a side of the first cell unit away from the center bus bar, a second end bus bar is disposed on a side of the second cell unit away from the center bus bar, two first cell strings of the first cell unit are connected in series by the first end bus bar, and two second cell strings of the second cell unit are connected in series by the second end bus bar;

in the fourth cell group, a third terminal bus bar is disposed on one side of the third cell string away from the center bus bar, a fourth terminal bus bar is disposed on one side of the fourth cell string away from the center bus bar, the third cell string is connected in series with the first sub lead bus bar through the third terminal bus bar, and the fourth cell string is connected in series with the second sub lead bus bar through the fourth terminal bus bar.

9. The photovoltaic module according to claim 8, wherein when the lead bus bar is located at one side of all the cell groups in the cell group arrangement direction,

the first leading-out section and the second leading-out section are respectively positioned at two sides of the photovoltaic module in the arrangement direction of the unit groups, the first lead-out section is connected to both the first and second sub lead bus bars and the first and second sub lead bus bars are connected in parallel through the first lead-out section, the second leading-out section is connected with the two battery strings on the other side in the unit group arrangement direction in a homogeneous manner, the two battery strings on the side are connected in parallel through the second leading-out section, the two adjacent battery strings on the same side of the central bus bar are connected in series through the central bus bar section, and the two battery strings on the different sides of the central bus bar along the series arrangement direction are connected in parallel through the central bus bar section.

10. The pv module according to claim 8 wherein bypass diodes are disposed between the first lead-out segment and the adjacent central bus bar segment, between two adjacent central bus bar segments, and between the second lead-out segment and the adjacent central bus bar segment, respectively, in anti-parallel connection with the corresponding cell group.

11. The pv module of claim 10 further comprising a plurality of junction boxes, one of said bypass diodes being disposed in each of said junction boxes.

12. The pv module according to claim 11, wherein the junction boxes are located in a middle portion of the pv module in the string arrangement direction and are located on the same line along the cell group arrangement direction.

13. The photovoltaic module according to any one of claims 1 to 3, wherein the width of the photovoltaic module is w and the length of the photovoltaic module is l, wherein w and l satisfy: w is more than or equal to 1150mm and less than or equal to 1520mm, and l is more than or equal to 1950mm and less than or equal to 2600 mm.

14. The photovoltaic module according to any one of claims 1 to 3, wherein each of the battery pieces is one half of a complete battery piece, the length direction of each of the battery pieces is the cell group arrangement direction, and the width direction of each of the battery pieces is the string arrangement direction.

15. The photovoltaic module according to any one of claims 1 to 3, wherein the number of the cell pieces of each of the first cell string, the second cell string, the third cell string and the fourth cell string is N, wherein N satisfies: n is more than or equal to 10 and less than or equal to 12.

16. The photovoltaic module according to any one of claims 1 to 3, wherein the number of the cells of each of the first cell string, the second cell string, the third cell string and the fourth cell string is equal.

17. The photovoltaic module of any of claims 1-3, wherein each of the cell pieces has a length L, wherein L satisfies: l is more than or equal to 156mm and less than or equal to 210 mm.

18. The photovoltaic module according to any one of claims 1 to 3, wherein the gap between two adjacent cells in each cell string is d, wherein d satisfies: d is more than or equal to 0mm and less than or equal to 3 mm.

19. The photovoltaic module of claim 18, wherein d further satisfies: d is more than or equal to 0.5mm and less than or equal to 0.9 mm.

20. A photovoltaic module according to any of claims 1-3, characterized by comprising:

a battery string layer including the first cell stack, the second cell stack, the third cell stack, and the fourth cell stack;

the back plate is arranged on the back surface of the battery string layer;

the frame is arranged at the edges of the battery string layer and the backboard;

the support rods are arranged on one side, far away from the battery string layer, of the back plate, the support rods are arranged along the length direction of the photovoltaic module at intervals, and two ends of each support rod are connected with two long edges of the frame respectively.