CN211480059U

CN211480059U - Photovoltaic module

Info

Publication number: CN211480059U
Application number: CN201922150839.4U
Authority: CN
Inventors: 潘秀娟; 谭康; 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: 2019-09-18
Filing date: 2019-12-04
Publication date: 2020-09-11
Anticipated expiration: 2029-12-04
Also published as: CN112531058A; CN110473934A; CN112542528B; CN211480060U; CN112542527A; CN112542527B; CN211480057U; CN210926041U; CN112531058B; CN112542528A; CN115985988A

Abstract

The utility model discloses a photovoltaic module, include: the battery pack comprises a first battery unit and a second battery unit, the first battery string of the first battery unit and the second battery string of the second battery unit both comprise a plurality of battery sheets which are connected in series through a welding strip group, in the same battery unit, a first connecting point of the two first battery strings and a second connecting point of the two second battery strings are electrically connected through a lead bus bar, the lead bus bar comprises two sub-lead bus bars, any first battery string and any second battery string with a common end point are respectively connected with the same diode in a reverse parallel mode through the two sub-lead bus bars, the lead bus bar is arranged on any one of the two first battery strings and extends to the corresponding second battery string, and the lead bus bar is located between the edge of any one of the two first battery strings and the edge of the corresponding welding strip group. According to the utility model discloses a photovoltaic module, the difficult lobe of a leaf of battery.

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

In the related art, the lead bus bar of the photovoltaic module is arranged in the gap between two adjacent strings of battery strings, specifically, an insulating bar is arranged below the lead bus bar, and the insulating bar and the battery pieces in the two adjacent strings of battery strings are partially overlapped.

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's battery piece is difficult for the lobe of a leaf.

According to the utility model discloses photovoltaic module, include: at least one battery cell group, the battery cell group comprises a first battery cell and a second battery cell, the first battery cell and the second battery cell are connected in parallel, the first battery cell comprises two first battery strings, the two first battery strings are connected in series, the second battery cell comprises two second battery strings, the two second battery strings are connected in series, the first battery string and the second battery string both comprise a plurality of battery sheets, the plurality of battery sheets are connected in series, in the same battery cell group, a first connecting point of the two first battery strings is electrically connected with a second connecting point of the two second battery strings through a lead bus bar, the lead bus bar comprises two sub-lead bus bars, and the first battery string and the second battery string which have a common endpoint arbitrarily are connected with the same diode through the two sub-lead bus bars in reverse parallel connection, the lead bus bar is provided on the back surface of any one of the two first battery strings and extends to the second battery string corresponding thereto.

According to the utility model discloses photovoltaic module through establishing the lead wire busbar at the back of arbitrary one in two first battery strings and extend to rather than the second battery string that corresponds to photovoltaic module's the difficult condition that the lobe of a leaf appears of battery piece has improved photovoltaic module's preparation yield.

According to the utility model discloses a some embodiments, it is a plurality of the battery piece is through welding the series connection of area group, it includes many welding strip, many to weld the area along a plurality of the cluster of battery piece is arranged the direction and is extended, the lead wire busbar is located two in the first battery string arbitrary one's edge with correspond between the edge of welding the area group.

According to some embodiments of the invention, the width of the lead bus bar is less than two distances between an edge of the arbitrary one of the first battery strings and an edge of the corresponding solder ribbon group.

According to some embodiments of the present invention, in a width direction of the lead bus bar, the lead bus bar is located at a center of an edge of the arbitrary one of the two first battery strings and an edge of the corresponding solder ribbon group.

According to some embodiments of the present invention, one side of the lead bus bar, which is away from the solder ribbon group in the width direction, extends to beyond an edge of the any one of the two first battery strings.

According to some embodiments of the present invention, a plurality of two adjacent laps in the battery piece are connected in series.

According to some embodiments of the present invention, the thickness of the lead bus bar is t, wherein t satisfies: t is more than or equal to 0.1mm and less than or equal to 0.5 mm.

According to some embodiments of the present invention, the width of the lead bus bar is w, wherein w satisfies: w is more than or equal to 1mm and less than or equal to 5 mm.

According to the utility model discloses a some embodiments, lead wire busbar and two in the first battery cluster be equipped with at least one insulator strip between the arbitrary one, the both ends of insulator strip extend to respectively first battery cluster with the second battery cluster.

According to some embodiments of the present invention, the two ends of the insulating strip extend from between the first battery string and the second battery string to the penultimate battery piece in the first battery string and the penultimate battery piece in the second battery string, respectively.

According to some embodiments of the invention, the length of the insulating strip is equal to the length of the lead bus bar.

According to the utility model discloses a some embodiments, the insulating strip is two, two the insulating strip is established respectively first battery cluster with on the second battery cluster, two the insulating strip is in break off between first battery cluster with the second battery cluster.

According to some embodiments of the invention, the width of the insulating strip is greater than or equal to the width of the lead bus bar.

According to some embodiments of the invention, the insulating strip is an ECPC piece or an EPE piece.

According to some embodiments of the invention, the insulating strip is a transparent insulating strip.

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 view of a cell stack of a photovoltaic module according to an embodiment of the present invention;

FIG. 3 is a schematic view of a cell sheet and a plurality of solder strips of section A circled in FIG. 2;

fig. 4 is a schematic diagram of the laying of the lead bus bar according to an embodiment of the present invention.

Reference numerals:

100: a photovoltaic module;

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

1111: a battery piece; 1112: a first connection point; 1113: welding a strip;

12: a second battery cell; 121: a second battery string; 1211: a second connection point;

2: a lead bus bar; 21: a sub-lead bus bar;

22: an insulating strip; 3: a diode; 4: a central bus bar.

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 to 4, a photovoltaic module 100 according to an embodiment of the present invention includes at least one cell unit 1.

Specifically, the battery cell group 1 includes 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, the first battery cell 11 includes two first battery strings 111, the two first battery strings 111 are connected in series, the second battery cell 12 includes two second battery strings 121, the two second battery strings 121 are connected in series, the first battery string 111 and the second battery string 121 each include a plurality of battery pieces 1111, and the plurality of battery pieces 1111 are connected in series. In the description of the present invention, "a plurality" means two or more.

In the same cell group 1, the first connection points 1112 of the two first cell strings 111 and the second connection points 1113 of the two second cell strings 121 are electrically connected through the lead bus bar 2, the lead bus bar 2 includes two sub-lead bus bars 21, and any first cell string 111 and any second cell string 121 having a common end point are connected in reverse parallel to the same diode 3 through the two sub-lead bus bars 21. Here, the two sub-lead bus bars 21 may be an integrally formed structure so as to be convenient for manufacturing, and of course, the two sub-lead bus bars 21 may also be a discrete structure.

For example, in the example of fig. 1, the photovoltaic module 100 includes three cell stacks 1, each cell stack 1 includes a first cell 11 and a second cell 12 connected in parallel, the first cell 11 includes two first cell strings 111 connected in series, the second cell 12 includes two second cell strings 121 connected in series, and each of the first cell string 111 and the second cell string 121 includes a plurality of cell sheets 1111 connected in series. In the same cell group 1, the lead bus bars 2 are used to electrically connect the first connection points 1112 of the two first cell strings 111 and the second connection points 1113 of the two second cell strings 121. Wherein the two sub lead bus bars 21 of the lead bus bar 2 connect the first battery string 111 and the second battery string 121 having a common terminal to the same diode 3 in anti-parallel, respectively. The diode 3 can prevent the first battery unit 11 or the second battery unit 12 connected in parallel from generating a hot spot effect when being shielded. Moreover, since the plurality of battery slices 1111 are connected in series, the output voltage across the photovoltaic module 100 is large, and the parallel arrangement of the first battery unit 11 and the second battery unit 12 can reduce the output voltage of the photovoltaic module 100 by half.

Thus, with the above arrangement, each diode 3 is connected in parallel with only one first battery unit 11 and one second battery unit 12, and compared with the conventional parallel connection of each diode 3 with two first battery units 11 and two second battery units 12, the number of battery strings connected in parallel with the diodes 3 is reduced, and on the premise that the diodes 3 are not broken down, the number of battery slices 1111 in each battery string is increased, thereby avoiding the problem that the diodes 3 are easily broken down in the reverse direction when the number of battery slices 1111 in the photovoltaic module 100 is increased. Moreover, compared with the existing photovoltaic module 100 with the same number of cells 1111, the number of the single-string cells 1111 connected in parallel in an anti-parallel mode of each diode 3 is smaller, and the hot spot temperature is lower.

Three battery cell stacks 1 are shown in fig. 1 for illustrative purposes, but it is obvious to those skilled in the art after reading the technical solutions of the present application that the solution can be applied to other numbers of battery cell stacks 1, which also falls within the protection scope of the present invention.

The lead bus bar 2 is provided on the back surface of any one of the two first battery strings 111 and extends to the corresponding second battery string 121. For example, in the example of fig. 2 and 3, the lead bus bar 2 is provided on the first battery string 111 on the left side and extends downward to the second battery string 121 on the left side. So set up, compare with the traditional mode of lapping lead wire busbar 2 simultaneously at the battery piece 1111 edge of two adjacent strings of batteries, the lifting surface is great relatively to the phenomenon of lamination lobe of a leaf is difficult for appearing.

According to the utility model discloses photovoltaic module 100 through establishing lead wire busbar 2 at the back of arbitrary one in two first battery cluster 111 and extend to rather than corresponding second battery cluster 121 to photovoltaic module 100's battery piece 1111 is difficult for appearing the condition of lobe of a leaf, has improved photovoltaic module 100's preparation yield.

According to some embodiments of the present invention, in conjunction with fig. 2 to 3, the plurality of battery pieces 1111 are connected in series by the solder ribbon set including the plurality of solder ribbons 1113, the plurality of solder ribbons 1113 extend in the string arrangement direction (for example, the up-down direction in fig. 1 and 2) of the plurality of battery pieces 1111, and the lead bus bar 2 is located between the edge of any one of the two first battery strings 111 and the edge of the corresponding solder ribbon set. For example, in the example of fig. 2 and 3, the lead bus bar 2 is located between the right edge of the first cell string 111 on the left and the right edge of the rightmost solder ribbon 1113 in the solder ribbon group thereon. With this arrangement, the space between the edge of the solder ribbon group and the edge of the battery piece 1111 is fully utilized.

Alternatively, referring to fig. 3, the width of the lead bus bar 2 is smaller than the distance between the edge of any one of the two first battery strings 111 and the edge of the corresponding solder ribbon group. For example, referring to fig. 3, a distance a between a right edge of the first battery string 111 on the left and a right edge of the rightmost solder ribbon 1113 in the solder ribbon group thereon is smaller than the distance a in width of the lead bus bar 2. In this way, the outermost solder strip 1113 in the solder strip group and the edge of the cell 1111 are avoided, so that the manufacturing yield of the photovoltaic module 100 can be further improved.

Further, the lead bus bar 2 is located at the center of the edge of any one of the two first battery strings 111 and the edge of the corresponding solder ribbon group in the width direction of the lead bus bar 2. Therefore, the edges of the outermost solder strips 1113 and the battery piece 1111 in the solder strip group can be avoided better, and the battery pack is easy to process and low in cost.

According to other embodiments of the present invention, a side of the lead bus bar in the width direction away from the tab group (for example, the right side in fig. 2) may also extend beyond an edge (not shown) of any of the above-described two first battery strings. At this time, a side of the lead bus bar in the width direction, which is away from the tab group, may extend into the gap between the two first battery strings. By such an arrangement, the manufacturing yield of the photovoltaic module 100 can be improved.

According to some embodiments of the present invention, two adjacent ones of the plurality of cells 1111 overlap to achieve a series connection. One of the two adjacent battery sheets 1111 has an end portion thereof connected to and electrically connected to the other end portion. At this time, the solder strip 1113 may not be provided, and the plurality of battery pieces 1111 may be electrically connected in series by overlapping. Therefore, the arrangement of the solder strips 1113 is omitted, so that the processing technology of the photovoltaic module 100 is simplified, and the cost is saved.

Optionally, the thickness of the lead bus bar 2 is t, where t satisfies: t is more than or equal to 0.1mm and less than or equal to 0.5 mm. Therefore, the thickness of the lead bus bar 2 can be made thinner while ensuring the improvement of the manufacturing yield of the photovoltaic module 100. But is not limited thereto.

Optionally, the lead bus bar has a width w, where w satisfies: w is more than or equal to 1mm and less than or equal to 5 mm. Therefore, the width of the lead bus bar 2 can be made narrower while ensuring that the manufacturing yield of the photovoltaic module 100 is improved.

According to a further embodiment of the present invention, as shown in fig. 2, at least one insulating strip 22 is provided between the lead bus bar 2 and any one of the two first battery strings 111, and both ends of the insulating strip 22 extend to the first battery string 111 and the second battery string 121, respectively. Thereby, the insulation bar 22 may effectively separate the lead bus bar 2 from the first and second battery strings 111 and 121.

Further, both ends of the insulating strip 22 extend from between the first battery string 111 and the second battery string 121 to the penultimate battery piece 1111 in the first battery string 111 and the penultimate battery piece 1111 in the second battery string 121, respectively. For example, in the example of fig. 2 showing one insulating bar 22, since the two battery pieces 1111, which are farthest from each other, within the first battery string 111 and the second battery string 121 corresponding thereto have the same polarity as the lead bus bar 2, and thus the length of the insulating bar 22 is less than the sum of the lengths of the first battery string 111 and the second battery string 121 corresponding thereto by about the width of the two battery pieces 1111, the length of the insulating bar 22 is reduced, and the cost can be reduced to some extent. Of course, the length of the insulating strip 22 may also be equal to that of the lead bus bar 2 (not shown) to better ensure the insulating effect between the lead bus bar 2 and the battery piece 1111.

Further, the number of the insulating strips 22 is two, the two insulating strips 22 are respectively disposed on the first cell string 111 and the second cell string 121, and the two insulating strips 22 are cut off between the first cell string 111 and the second cell string 121 (not shown). At this time, the length of each insulating strip 22 is less than the length of the corresponding first or second battery string 111 or 121 by the width of one cell 1111. With this arrangement, the length of the insulating strip 22 can be further reduced, and the cost can be further reduced.

Alternatively, the width of the insulating strip 22 is equal to or greater than the width of the lead bus bar 2. Therefore, the insulation effect can be better ensured. Further, the insulating strips 22 may be as thin as possible to provide insulation to avoid lamination cracking.

Optionally, the insulation strip 22 is ECPC (composite material of EVA and CPC, where EVA is ethylene-vinyl acetate copolymer and rubber-plastic foam material made of the same; CPC is Coating + PET + Coating, Coating material, where Coating refers to fluorocarbon paint, and the main component is fluorocarbon resin such as FEVE (fluoro olefin-vinyl ether copolymer), PVDF (polyvinylidene fluoride), ETFE (ethylene-tetrafluoroethylene copolymer), PET is polyethylene terephthalate) or EPE (composite material of EVA and PC, where EVA is ethylene-vinyl acetate copolymer and rubber-plastic foam material made of the same; and PC is Polycarbonate. But is not limited thereto.

Optionally, the insulating strip 22 is a transparent insulating strip or a white insulating strip. Wherein, when photovoltaic module 100 is double-sided dual glass assembly, transparent insulating strip 22 can be adopted to improve double-sided rate.

Further, referring to fig. 1, a center bus bar 4 is connected between a first battery cell 11 and a second battery cell 12, the center bus bar 4 includes at least one partition region located between two common end points in a battery cell group 1, the center bus bar 4 is partitioned into a plurality of sub-center bus bars 4 by the partition region, and one diode 3 is electrically connected between the end of each of two adjacent sub-center bus bars 4 formed by the partition region and a lead bus bar 2.

According to the utility model discloses photovoltaic module 100 through adopting the photovoltaic module 100 that the circuit design shown in FIG. 1 typesets, can reduce the influence of hot spot effect to photovoltaic module 100, and can realize being greater than laying of 144 battery pieces 1111. For example, the number of the battery pieces 1111 in each of the first battery string 111 and the second battery string 121 is greater than or equal to twelve. It should be noted that the diode 3 is limited by its reverse voltage withstanding capability, and the number of the battery slices 1111 that can be protected at most is no more than twenty-four, and for the existing photovoltaic module 100, the reverse voltage of each diode 3 is equal to the total voltage of the two series-connected battery strings connected in parallel, so the number of the battery slices 1111 in each battery string is at most twelve. In the photovoltaic module 100 provided in this embodiment, the reverse voltage of each diode 3 is equal to the voltage of one cell string, the number of the cells 1111 in each cell string may be twenty-four at most, the number of the cells 1111 in each cell string in the photovoltaic module 100 provided in this embodiment may be increased by one time, and further, the total number of the cells 1111 in the photovoltaic module 100 may be increased by one time under the condition that the number of the cell strings is equal. Based on the above analysis, the number of the cells 1111 in the first cell string 111 and the second cell string 121 in the present embodiment is greater than the maximum number of the cells 1111 that can be included in the cell string in the prior art, that is, twelve cells, so as to increase the number of the cells 1111 in the photovoltaic module 100 on the premise of ensuring the normal operation of the photovoltaic module 100, and obtain better device performance compared to the prior art. And the number of the battery pieces 1111 in the first battery string 111 and the second battery string 121 is set to be equal to the maximum number of the battery pieces 1111 that the battery string in the prior art may include, that is, twelve battery pieces, at this time, the number of the battery pieces 1111 connected in parallel to each diode 3 is far smaller than the number of the battery pieces 1111 that the diode 3 can bear the load at the maximum, compared with the prior art in which the diode 3 needs to adopt the maximum reverse withstand voltage to bear the twelve battery pieces 1111, the probability of the diode 3 reverse breakdown caused by the performance fluctuation of the diode 3 due to the influence of the process error in the technical scheme provided by this embodiment is effectively reduced.

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", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations and positional relationships based on the orientations and positional relationships 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 so 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 of the present invention, the first feature "on" or "under" the second feature may include the first and second features being in direct contact, and may also include the first and second features being in contact with each other not directly but through another feature therebetween.

In the description of the invention, the first feature being "on", "above" and "above" the second feature includes the first feature being directly above and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature.

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:

at least one battery cell stack, the battery cell stack comprising a first battery cell and a second battery cell, the first battery cell and the second battery cell being connected in parallel, the first battery cell comprising two first battery strings, the two first battery strings being connected in series, the second battery cell comprising two second battery strings, the two second battery strings being connected in series, the first battery string and the second battery string each comprising a plurality of battery pieces, the plurality of battery pieces being connected in series,

in the battery cell group, two first connection points of the first battery strings are electrically connected with two second connection points of the second battery strings through lead bus bars, each lead bus bar comprises two sub-lead bus bars, the first battery strings and the second battery strings which have public endpoints randomly are respectively connected with the same diode through the two sub-lead bus bars in a reverse parallel connection mode, and the lead bus bars are arranged on the back faces of any one of the first battery strings and extend to the corresponding second battery strings.

2. The photovoltaic module according to claim 1, wherein a plurality of the battery pieces are connected in series by a solder ribbon group including a plurality of solder ribbons extending in a string arrangement direction of the plurality of the battery pieces, and the lead bus bar is located between an edge of the any one of the two first battery strings and an edge of the corresponding solder ribbon group.

3. The photovoltaic assembly of claim 2, wherein a width of the lead bus bar is less than a distance between an edge of the any one of the two first strings of cells and an edge of the corresponding group of solder ribbons.

4. The photovoltaic module according to claim 2, wherein the lead bus bar is located at a center of an edge of the any one of the two first cell strings and an edge of the corresponding solder ribbon group in a width direction of the lead bus bar.

5. The photovoltaic module according to claim 2, wherein a side of the lead bus bar in the width direction away from the tab group extends beyond an edge of the either one of the two first cell strings.

6. The assembly according to claim 1, wherein two adjacent ones of the plurality of cells overlap to provide a series connection.

7. The photovoltaic module of claim 1, wherein the lead bus bar has a thickness t, wherein t satisfies: t is more than or equal to 0.1mm and less than or equal to 0.5 mm.

8. The photovoltaic module of claim 1, wherein the lead bus bar has a width w, wherein w satisfies: w is more than or equal to 1mm and less than or equal to 5 mm.

9. The photovoltaic module according to any one of claims 1 to 8, wherein at least one insulating strip is provided between the lead bus bar and the any one of the two first cell strings, and both ends of the insulating strip extend to the first cell string and the second cell string, respectively.

10. The photovoltaic module of claim 9, wherein both ends of the insulating strip extend from between the first string of cells and the second string of cells to the penultimate cell in the first string of cells and the penultimate cell in the second string of cells, respectively.

11. The photovoltaic module of claim 9, wherein the insulating strip has a length equal to a length of the lead bus bar.

12. The assembly according to claim 9, wherein the number of the insulating strips is two, and two insulating strips are respectively provided on the first cell string and the second cell string, and the two insulating strips are disconnected between the first cell string and the second cell string.

13. The photovoltaic module of claim 9, wherein the insulating strip has a width equal to or greater than a width of the lead bus bar.

14. The photovoltaic module of claim 9, wherein the insulating strip is an ECPC piece or an EPE piece.

15. The photovoltaic module of claim 9, wherein the insulating strip is a transparent insulating strip.