CN214505517U

CN214505517U - Photovoltaic module

Info

Publication number: CN214505517U
Application number: CN202120552613.1U
Authority: CN
Inventors: 陈辉; 贾行; 董经兵; 许涛
Original assignee: CSI Cells Co Ltd; Canadian Solar Manufacturing Changshu Inc
Current assignee: CSI Cells Co Ltd; Canadian Solar Manufacturing Changshu Inc; CSI Solar Technologies Inc
Priority date: 2021-03-17
Filing date: 2021-03-17
Publication date: 2021-10-26
Anticipated expiration: 2031-03-17

Abstract

The utility model discloses a photovoltaic module, photovoltaic module includes: the battery pack comprises a plurality of battery strings, a plurality of battery strings and a plurality of battery modules, wherein the battery strings are arranged along a string arrangement direction, each battery string comprises a plurality of battery pieces which are arranged along the extension direction of the battery string, and two adjacent battery pieces of each battery string are connected in series through a first interconnection structural member; the cross bus bar comprises a first bus bar and a second bus bar, the first bus bar extends along the string arrangement direction, the first bus bar is located in the sheet gap and electrically connected with the first interconnection structural members of the plurality of cell strings in the sheet gap, the second bus bar is electrically connected with the first bus bar, and the second bus bar extends along the extension direction of the cell strings. According to the utility model discloses a photovoltaic module, the technology processing procedure is simpler, improves photovoltaic module's production efficiency, and can reduce the risk of battery piece lobe of a leaf, has improved photovoltaic module's reliability.

Description

Photovoltaic module

Technical Field

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

Background

In the related art, two adjacent cells in a cell string of a photovoltaic module are generally connected in series by a solder ribbon. The bus bars are typically connected to solder strips on the back of the cell string, which increases the risk of cell splintering. Moreover, the process of the photovoltaic module is generally complicated, which results in low production efficiency of the photovoltaic module.

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 present invention is to provide a photovoltaic module, which has a simple process and can reduce the risk of cell cracking.

According to the utility model discloses photovoltaic module, include: the battery pack comprises a plurality of battery strings, a plurality of battery strings and a plurality of battery modules, wherein the battery strings are arranged along a string arrangement direction, each battery string comprises a plurality of battery pieces which are arranged along a battery string extension direction perpendicular to the string arrangement direction, at least two adjacent battery pieces of each battery string are arranged at intervals to form piece gaps, and two adjacent battery pieces of each battery string are connected in series through a first interconnection structural member; the cross bus bar comprises a first bus bar and a second bus bar, the first bus bar extends along the string arrangement direction, the first bus bar is located in the sheet gap and is electrically connected with the first interconnection structural members of the cell strings in the sheet gap, the second bus bar is electrically connected with the first bus bar, and the second bus bar extends along the extension direction of the cell strings.

According to the embodiment of the utility model, through setting up a plurality of battery clusters and including the cross busbar of first busbar and second busbar, and make a plurality of battery clusters arrange along the cluster direction of arranging, each battery cluster includes a plurality of battery pieces of arranging along the battery cluster extending direction perpendicular to cluster direction of arranging, and the first busbar lies in the piece clearance and all connects electrically with the first interconnection structure of a plurality of battery clusters in the piece clearance, the second busbar is connected electrically with first busbar, on the one hand, can make the technology process of photovoltaic module simpler, improve the production efficiency of photovoltaic module; on the other hand, the risk of cell splitting can be reduced, and the reliability of the photovoltaic module is improved.

According to some embodiments of the invention, the width of the first busbar is less than the corresponding width of the sheet gap, the absolute value of the difference between the width of the first busbar and the corresponding width of the sheet gap is Δ L, wherein Δ L satisfies: delta L is more than or equal to 4mm and less than or equal to 10 mm.

According to the utility model discloses a some embodiments, every adjacent two of battery cluster all have between the battery piece the piece clearance, it is a plurality of the piece clearance includes first piece clearance and a plurality of second piece clearance, every the width in second piece clearance is less than the width in first piece clearance, first busbar is located in the first piece clearance, except in the photovoltaic module first piece clearance the piece clearance be the second piece clearance.

According to some embodiments of the utility model, every the battery piece is one of X of complete battery piece, wherein, X is more than or equal to 3's positive integer, the cluster direction of arranging does the length extending direction of battery piece, battery cluster extending direction does the width extending direction of battery piece.

According to some embodiments of the invention, X further satisfies: x is more than or equal to 3 and less than or equal to 6.

According to some embodiments of the present invention, each of the length of the battery piece is L, and each of the width of the battery piece is W₁Wherein, the L, W₁Respectively satisfy: l is more than or equal to 182mm and less than or equal to 240mm, and W is more than or equal to 40mm₁≤80mm。

According to the utility model discloses a some embodiments, every one side of battery piece on the thickness direction is equipped with a plurality of grid lines on the surface, every the grid line is followed the extending direction of first interconnect structure extends, just first interconnect structure with correspond the grid line electricity is connected, every the battery piece one side is on the surface the quantity of grid line is N, wherein, N satisfies: n is more than or equal to 5 and less than or equal to 7.

According to some embodiments of the invention, the second busbar is located at a gap between two adjacent battery strings; or at least a portion of the second bus bar is located on a back side of the cell string.

According to some embodiments of the invention, the width of the first busbar is W₂The width of the second bus bar is W₃Wherein, the W₂、W₃Respectively satisfy: w is not less than 3mm₂≤10mm，3mm≤W₃≤10mm。

According to some embodiments of the invention, the thickness of the first busbar is T₁The thickness of the second bus bar is T₂Wherein, the T is₁、T₂Respectively satisfy: t is not less than 0.15mm₁≤0.6mm，0.15mm≤T₂≤0.6mm。

According to some embodiments of the invention, the second bus bar and the first bus bar are of unitary construction.

According to some embodiments of the present invention, the second bus bar is connected to the first bus bar and the second bus bar is connected to the second bus bar.

According to some embodiments of the present invention, the photovoltaic module further comprises: a plurality of second interconnection structures, the second interconnection structures are electrically connected with the battery plates at two ends of the plurality of battery strings along the extension direction of the battery strings, and one end of each second interconnection structure, which is far away from the center of the battery string, extends to exceed one side edge, which is far away from the center of the battery string, of the corresponding battery plate; a plurality of tip bus bars, it is a plurality of the tip bus bar is located a plurality of respectively the edge of battery cluster extending direction's both ends, every the tip bus bar is followed the cluster direction of arranging extends, every the tip bus bar is with a plurality of battery cluster the second interconnect structure all links to each other so that it is a plurality of battery cluster parallel connection, every be equipped with the lead-out wire on the tip bus bar, bypass diode connects the tip of second bus bar and corresponding between the lead-out wire.

According to some embodiments of the invention, the outgoing line extends along the battery string extending direction.

According to some embodiments of the invention, the second bus bar and the corresponding outgoing line are opposite to each other in the cell string extending direction; or the second bus bar and the corresponding outgoing line are arranged in a staggered manner along the serial arrangement direction.

According to some embodiments of the invention, the outgoing line extends along the string arrangement direction.

According to some embodiments of the invention, the photovoltaic module further comprises: a front cover plate; the back cover plate is arranged on one side of the front cover plate in the thickness direction, the plurality of battery strings are positioned between the front cover plate and the back cover plate, and the back cover plate is provided with two wire passing holes which are communicated along the thickness direction of the back cover plate; the two junction boxes are arranged on the surface of one side, far away from the front cover plate, of the back cover plate, each bypass diode is arranged in the corresponding junction box, and the end part of the second bus bar and the corresponding outgoing line respectively penetrate through the same wire passing hole to be connected with the corresponding bypass diode.

According to some embodiments of the present invention, the first interconnection structure includes a first connection section and a second connection section that are connected to each other, the first connection section is a non-flat section, the first connection section is connected to the front of the battery piece, the second connection section is a flat section, the second connection section is connected to be adjacent to the back of the battery piece.

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 structural diagram of a battery string according to an embodiment of the present invention;

fig. 2 is a schematic structural view of a plurality of battery strings and a first bus bar according to an embodiment of the present invention;

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

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

Reference numerals:

100: a battery string;

1: a battery piece; 2: a first chip pitch;

3: a second chip spacing; 4: a first interconnecting structural member;

5: a second interconnecting structural member; 6: a bypass diode;

200: a photovoltaic module;

201: a first bus bar; 202: a second bus bar;

203: an end bus bar; 204: and (6) leading out wires.

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 200 according to an embodiment of the present invention is described below with reference to fig. 1-4.

As shown in fig. 1 and 3, a photovoltaic module 200 according to an embodiment of the present invention includes a plurality of cell strings 100 and a cross bus bar.

The plurality of cell strings 100 are arranged along a string arrangement direction, each cell string 100 includes a plurality of cells 1 arranged along a cell string 100 extending direction perpendicular to the string arrangement direction, at least two adjacent cells 1 of each cell string 100 are arranged at intervals to form a cell gap, and two adjacent cells 1 of each cell string 100 are connected in series through a first interconnection structure 4. Therefore, the first interconnecting structural member 4 can lead out the current generated by the plurality of battery sheets 1 of the battery string 100 through the photovoltaic effect, and ensure that the photovoltaic module 200 has higher output power. Moreover, because the plurality of cell strings 100 are connected in parallel along the string arrangement direction and the plurality of cells 1 of each cell string 100 are connected in series along the extending direction of the cell string 100, the circuit design is simple, all the cells 1 can be regularly and relatively closely arranged, and the electric connection between the adjacent cells 1 in the cell string 100 is facilitated, and meanwhile, the reduction of the occupied space of the whole photovoltaic module 200 is facilitated, so that the photovoltaic module 200 can be installed on a roof. In addition, compared with the existing photovoltaic module, each cell string 100 is a complete long string, and the first interconnection structural member 4 in the cell string 100 can be disconnected without being connected with a central bus bar, so that the cell string 100 can be conveniently laid, the process of the photovoltaic module 200 is simplified, and the production efficiency of the photovoltaic module 100 can be effectively improved.

The cross bus bar includes a first bus bar 201 and a second bus bar 202, the first bus bar 201 extends along the string arrangement direction, the first bus bar 201 is located in the inter-sheet space and electrically connected to the first interconnection structural members 4 of the plurality of cell strings 100 in the inter-sheet space, the second bus bar 202 is electrically connected to the first bus bar 201, and the second bus bar 202 extends along the extension direction of the cell strings 100.

For example, in the example of fig. 2 and 3, the first bus bar 201 and the second bus bar 202 each extend linearly, the first bus bar 201 and the second bus bar 202 are perpendicular to each other, and the number of the battery sheets 1 of the plurality of battery strings 100 located on the same side as the first bus bar 201 is equal. The photovoltaic module 200 includes five cell strings 100 connected in parallel, and the first bus bar 201 divides the five cell strings 100 into upper and lower portions. Therefore, by arranging the first bus bar 201 and the second bus bar 202, the first bus bar 201 can transmit the current generated by the photovoltaic effect of the cell sheets 1 of the plurality of cell strings 100 to the second bus bar 202, and finally the current is led out through the second bus bar 202, so that the photovoltaic module 100 is ensured to have higher output power. Moreover, by arranging the first bus bar 201 in the sheet gap, compared with the existing photovoltaic module, the first bus bar 201 does not need to be arranged on the back surface of the cell sheet 1, and the first bus bar 201 can be prevented from contacting with the adjacent cell sheet 1, so that the risk of splitting of the cell sheet 1 can be reduced, and the reliability of the photovoltaic module 200 can be improved.

Five battery strings 100 are shown in fig. 3 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 strings 100, which also falls within the protection scope of the present invention.

According to the embodiment of the present invention, the photovoltaic module 200 is configured by arranging the plurality of cell strings 100 and the cross bus bar including the first bus bar 201 and the second bus bar 202, and arranging the plurality of cell strings 100 along the string arrangement direction, wherein each cell string 100 includes the plurality of cell sheets 1 arranged along the extending direction of the cell string 100 perpendicular to the string arrangement direction, and the first bus bar 201 is located in the sheet gap and electrically connected to the first interconnection structure members 4 of the plurality of cell strings 100 in the sheet gap, and the second bus bar 202 is electrically connected to the first bus bar 201, on one hand, the process of the photovoltaic module 200 can be simpler, and the production efficiency of the photovoltaic module 200 can be improved; on the other hand, the risk of splitting the cell sheet 1 can be reduced, and the reliability of the photovoltaic module 200 can be improved.

In some optional embodiments of the present invention, in conjunction with fig. 2 and 3, the width of the first bus bar 201 is less than the width of the corresponding sheet gap, and the absolute value of the difference between the width of the first bus bar 201 and the width of the corresponding sheet gap is Δ L, where Δ L satisfies: delta L is more than or equal to 4mm and less than or equal to 10 mm. For example, when Δ L < 4mm, the absolute value of the difference between the width of the first bus bar 201 and the width of the corresponding sheet gap is too small, the first bus bar 201 may overlap the edge of the adjacent battery sheet 1, thereby possibly causing the battery sheet 1 to be cracked; when Δ L > 10mm, the absolute value of the difference between the width of the first bus bar 201 and the width of the corresponding sheet gap is too large, resulting in too small a density of the plurality of battery sheets 1, reducing the amount of power generation per unit area of the photovoltaic module 100. Thus, by making Δ L satisfy: delta L is more than or equal to 4mm and less than or equal to 10mm, the output power of the photovoltaic module 200 is improved, the risk of splitting of the cell 1 can be further reduced, and the long-term reliability of the photovoltaic module 200 is ensured.

In some optional embodiments of the present invention, referring to fig. 2 and fig. 3, two adjacent battery plates 1 of each battery string 100 may have a plate gap therebetween, the plurality of plate gaps include a first plate gap and a plurality of second plate gaps, a width of each second plate gap is smaller than a width of the first plate gap, the first bus bar 201 is located in the first plate gap, and the plate gaps other than the first plate gap in the photovoltaic module 200 are the second plate gaps. Therefore, through the arrangement, two adjacent battery sheets 1 of each battery string 100 can be spaced from each other, and the first bus bar 201 can be located at the maximum sheet gap, so that the first bus bar 201 can be effectively prevented from contacting the adjacent battery sheets 1, and the battery sheets 1 can be better prevented from being cracked.

In some embodiments of the present invention, referring to fig. 4, bypass diodes 6 are respectively connected between both ends of the second bus bar 202 and corresponding ends of the plurality of battery strings 100. For example, in the example of fig. 3 and 4, when the cell sheet 1 located on the upper side of the first bus bar 201 is shaded by a shadow, since the second bus bar 202 is connected to the first bus bar 201, the bypass diode 6 connected between the upper end of the second bus bar 202 and the corresponding end of the plurality of cell strings 100 can implement a bypass function, and at this time, the cell sheet 1 located on the lower side of the first bus bar 201 can still operate normally, so that the photovoltaic module 200 can output electric energy outwards; when the cell sheet 1 located on the lower side of the first bus bar 201 is shielded by a shadow, the bypass diode 6 connected between the lower end of the second bus bar 202 and the corresponding end of the plurality of cell strings 100 can realize a bypass function, and the cell sheet 1 located on the upper side of the first bus bar 201 can still normally work at this time, so that the power generation efficiency of the photovoltaic module 200 is ensured. Thus, by providing the bypass diode 6, a bypass function can be realized when the cell pieces 1 of the plurality of cell strings 100 are shielded by a shadow, and the occurrence of a hot spot effect can be avoided.

In some embodiments of the present invention, as shown in fig. 1-3, each cell 1 is one-third of the complete cell, where X is a positive integer greater than or equal to 3, the string arrangement direction is the length extending direction of the cell 1, and the extending direction of the cell string 100 is the width extending direction of the cell 1. For example, the processing of the battery piece 1 can be realized by laser scribing. Therefore, by making X be a positive integer greater than or equal to 3, on the premise that the number of complete cells in a single cell string 100 is not changed, the number of cells 1 connected in series is correspondingly increased, so that the internal loss of the photovoltaic module 200 can be reduced, and the photovoltaic module 200 is ensured to have higher output power, and is helpful for reducing the cost per watt. Moreover, since the extending direction of the cell string 100 is the width extending direction of the cell 1, the cell string 100 can accommodate a larger number of cells 1, so that the output power of the photovoltaic module 200 can be further increased.

Further, X further satisfies: x is more than or equal to 3 and less than or equal to 6. Specifically, for example, when X < 3, the number of the battery slices 1 of a single battery string 100 can be generally controlled within thirty, and a bypass diode 6 does not need to be connected in parallel to protect the circuit in the single battery string 100; when X > 6, the number of the battery pieces 1 in the single battery string 100 is too large, and since the number of the battery pieces 1 protected by the single bypass diode 6 is generally less than or equal to thirty, the bypass diode 6 may break down. Therefore, X is more than or equal to 3 and less than or equal to 6, on the premise of effectively reducing the internal loss of the photovoltaic module 200, the bypass diode 6 can fully exert the function to the maximum, the battery piece 1 is effectively prevented from generating a hot spot effect, meanwhile, the bypass diode 6 can be prevented from being broken down and damaged, the safety of the bypass diode 6 is ensured, and the cost of the photovoltaic module 200 is favorably reduced.

In some embodiments of the present invention, the length of each cell 1 is L, and the width of each cell 1 is W₁Wherein, L, W₁Satisfies the following conditions: l is more than or equal to 182mm and less than or equal to 240mm, and W is more than or equal to 40mm₁Less than or equal to 80 mm. Thus, by making L satisfy: l is more than or equal to 182mm and less than or equal to 240mm, and the length of the cell 1 is larger, so that the effective light-emitting area of the photovoltaic module 100 can be increased, the conversion efficiency and the output power of the photovoltaic module 100 can be increased, and the cost of a single watt can be effectively reduced. Optionally, L may further satisfy: less than or equal to 200mmL≤240mm。

In some embodiments of the utility model, one side of each battery piece 1 in the thickness direction is equipped with a plurality of grid lines on the surface, and each grid line extends along the extending direction of first interconnect structure 4, and first interconnect structure 4 is connected with the grid line electricity that corresponds, and the quantity of the above-mentioned one side grid line on the surface of each battery piece 1 is N, and wherein, N satisfies: n is more than or equal to 5 and less than or equal to 7. For example, when N < 5, the number of grid lines is too small, which may result in too low a lead-out welding tension between the first interconnection structure 4 and the corresponding cell 1; when N > 7, the number of gate lines is too many, so that the shielding area of the cell sheet 1 is too large, the output power of the photovoltaic module 200 is affected, the usage amount of silver paste is increased, and the cost of the photovoltaic module 100 is increased. Thus, by making N satisfy: n is more than or equal to 5 and less than or equal to 7, the number of the first interconnection structural members 4 on the surface of one side of each battery piece 1 can be 5-7, and on one hand, the welding tension of the first interconnection structural members 4 and the corresponding battery pieces 1 can be improved; on the other hand, the light receiving area of the cell 1 can be increased, the current generated by the cell 1 through the photovoltaic effect can be effectively led out, the photovoltaic module 200 is ensured to have higher output power, and the cost can be reduced.

In some optional embodiments of the present invention, the width of the first bus bar 201 is W₂The width of the second bus bar 202 is W₃Wherein W is₂、W₃Respectively satisfy: w is not less than 3mm₂≤10mm，3mm≤W₃Less than or equal to 10 mm. Wherein, W₂And W₃May or may not be equal.

Specifically, for example, when W₂If the width of the first bus bar 201 is too small < 3mm, the resistance of the first bus bar 201 is large, which may result in poor conductivity of the first bus bar 201; when W is₂When the width of the first bus bar 201 is larger than 10mm, the cost of the first bus bar 201 is higher, and the sheet gap is larger, so that the density of the cell sheets 1 is reduced, and the output power of the photovoltaic module 200 is reduced. Similarly, when W₃When the width is less than 3mm, the width of the second bus bar 202 is too small, and the conductive capability is weak; when W is₃Of the second bus bar 202 > 10mmToo large width and high cost. Thereby, by making W₂、W₃Respectively satisfy: w is not less than 3mm₂≤10mm，3mm≤W₃The width of the first bus bar 201 and the width of the second bus bar 202 are more reasonable than or equal to 10mm, on one hand, the first bus bar 201 and the second bus bar 202 have smaller resistance, stronger conductive capability and lower cost; on the other hand, the density of the cell pieces 1 can be effectively improved, the arrangement of the cell pieces 1 is more compact, the power generation capacity per unit area of the photovoltaic module 200 is improved, and the occupied space of the photovoltaic module 200 can be reduced. Further optionally, W₂、W₃Can respectively satisfy: w is not less than 3mm₂≤8mm，3mm≤W₃Less than or equal to 8mm, e.g. W₂And W₃And may be 7 mm. But is not limited thereto.

In some optional embodiments of the present invention, the thickness of the first bus bar 201 is T₁The thickness of the second bus bar 202 is T₂Wherein, T₁、T₂Respectively satisfy: t is not less than 0.15mm₁≤0.6mm，0.15mm≤T₂Less than or equal to 0.6 mm. Wherein, T₁And T₂May or may not be equal.

For example, when T₁When the thickness of the first bus bar 201 is less than 0.15mm, the resistance of the first bus bar 201 is large, which may result in poor conductivity of the first bus bar 201; when T is₁If the thickness of the first bus bar 201 is larger than 0.6mm, the dimension of the photovoltaic module 200 in the thickness direction is larger, and the cost of the photovoltaic module 100 is increased. Thereby, by making T₁、T₂Respectively satisfy: t is not less than 0.15mm₁≤0.6mm，0.15mm≤T₂Less than or equal to 0.6mm, the thickness of first busbar 201 and second busbar 202 is reasonable, makes the resistance of first busbar 201 and second busbar 202 less, has stronger electrically conductive ability, and can avoid increasing the thickness of whole photovoltaic module 200 to can reduce photovoltaic module 200's occupation space, reduce photovoltaic module 200's weight.

In some optional embodiments of the present invention, the second bus bar 202 may be located at a gap between two adjacent battery strings 100. With such an arrangement, the first bus bar 202 can be prevented from contacting the cell 1 of the adjacent cell string 100, so that the risk of splitting the cell 1 can be effectively reduced, and the reliability of the photovoltaic module 200 can be improved.

In other optional embodiments of the present disclosure, at least a portion of the second bus bar 202 is located at the back of the battery string 100. That is, it may be that the entire second bus bar 202 is located completely at the back of the cell sheet 1 of the cell string 100, or that one portion of the second bus bar 202 is located at the back of the cell sheet 1 of the cell string 100, and another portion is located at the gap between two adjacent cell strings 100 or at the edge of the photovoltaic module 100. In this way, the second bus bar 202 can be hidden on the back of the photovoltaic module 200, so that the dimensions in the length direction and the width direction of the photovoltaic module 200 can be reduced, the arrangement of the plurality of cell strings 100 can be more compact, and the occupied space of the photovoltaic module 200 can be reduced.

Of course, the present invention is not limited thereto, and the second bus bar 202 may be located at one side of all the battery strings 100. It is understood that the position where the second bus bar 202 is disposed may be specifically determined according to actual requirements to better meet the actual application.

In some embodiments of the present invention, in conjunction with fig. 3 and 4, the photovoltaic assembly 200 further comprises a plurality of second interconnecting structural members 5 and a plurality of end bus bars 203. The second interconnecting structural members 5 are electrically connected to the battery plates 1 at two ends of the battery strings 100 along the extending direction of the battery strings 100, and one end of each second interconnecting structural member 5, which is far away from the center of the battery string 100, extends to exceed one side edge of the corresponding battery plate 1, which is far away from the center of the battery string 100. A plurality of end bus bars 203 are respectively located at both ends of the plurality of cell strings 100 in the extending direction of the cell strings 100, each end bus bar 203 extends in the string arrangement direction, each end bus bar 203 is connected to a plurality of second interconnecting structural members 5 of the plurality of cell strings 100 to connect the plurality of cell strings 100 in parallel, an outgoing line 204 is provided on each end bus bar 203, and a bypass diode 6 is connected between the end of the second bus bar 202 and the corresponding outgoing line 204.

For example, two end bus bars 203 are shown in the example of fig. 3, and the lead-out lines 204 may include a positive lead-out line and a negative lead-out line. One of the two end bus bars 203 is provided with a positive lead wire, and a bypass diode 6 is provided between one end of the second bus bar 202 and the positive lead wire. The other of the two end bus bars 203 is provided with a negative lead wire, and a bypass diode 6 is provided between the other end of the second bus bar 202 and the negative lead wire. Thus, by providing the plurality of second interconnecting members 5 and the end bus bars 203, the plurality of second interconnecting members 5 can transmit the current generated by the plurality of battery sheets 1 of the plurality of battery strings 100 through the photovoltaic effect to the end bus bars 203, and the end bus bars 203 can collect the current transmitted by the plurality of second interconnecting members 5. By arranging the lead-out wire 204, the lead-out wire 204 can effectively lead out the current generated by the plurality of battery pieces 1, and the connection of the bypass diode 6 can be realized, so that the whole photovoltaic module 200 can be effectively protected.

It should be noted that the first interconnection structure 4 and the second interconnection structure 5 may be metal conductive wires commonly used in the photovoltaic field, and the material of the conductive wires may be copper wires, or tin-plated copper wires, or conductive wires plated with low-temperature alloy on the surface, such as low-temperature solder strips or bus bars plated with metals such as nickel and lead.

In some optional embodiments of the present invention, as shown in fig. 3, the outlet 204 may extend along the extending direction of the battery string 100. For example, in the example of fig. 3, both lead-out lines 204 are parallel to the second bus bar 202. One of the two outgoing lines 204 and the second bus bar 202 are opposed to each other in the extending direction of the cell string 100, and the other of the two outgoing lines 204 and the second bus bar 202 are arranged with being shifted in the string arrangement direction. Therefore, since the lead-out wire 204 and the second bus bar 202 need to pass through the back cover to be connected to the corresponding bypass diode 6, by extending the lead-out wire 204 in the extending direction of the battery string 100, the extending direction of the lead-out wire 204 and the extending direction of the second bus bar 202 can be aligned, so that the lead-out wire 204 and the second bus bar 202 can pass through the same position on the back cover, and the opening area of the back cover can be effectively reduced.

In the above-described embodiment, an example is described in which one of the two outgoing lines 204 and the second bus bar 202 are opposed to each other in the extending direction of the cell string 100, and the other is arranged to be shifted from the second bus bar 202 in the string arrangement direction. It is to be understood that it is also possible that both the lead-out wires 204 and the second bus bars 202 are opposed to each other in the extending direction of the cell string 100, or both the lead-out wires 204 and the second bus bars 202 are arranged offset in the string arrangement direction. The utility model discloses do not limit to this.

Of course, the present invention is not limited thereto, and in other embodiments of the present invention, the outlet 204 may extend in the string arrangement direction (not shown). It is understood that the specific extending direction of the outlet 204 can be specifically set according to actual requirements to better meet the actual application.

In some embodiments of the present invention, the photovoltaic module 200 further comprises a front cover plate, a back cover plate and two junction boxes (not shown). The back cover plate is arranged on one side of the front cover plate in the thickness direction, the plurality of battery strings 100 are located between the front cover plate and the back cover plate, and the back cover plate is provided with two wire passing holes which are communicated in the thickness direction of the back cover plate. The two junction boxes are arranged on the surface of one side of the back cover plate far away from the front cover plate, each bypass diode 6 is arranged in the corresponding junction box, and the end part of the second bus bar 202 and the corresponding outgoing line 204 respectively penetrate through the same line passing hole to be connected with the corresponding bypass diode 6.

For example, a front cover plate may be disposed on the front side of the plurality of battery strings 100, a back cover plate may be disposed on the back side of the plurality of battery strings 100, both terminal blocks may be disposed on the back side of the back cover plate, and the edges of the front cover plate, the back cover plate, and the plurality of battery strings 100 may be provided with a frame. Alternatively, the front cover plate may be glass. The front surface refers to a main light receiving surface of the cell sheet 1, that is, a surface of the cell sheet 1 or the photovoltaic module 200 directly receiving sunlight, and the back surface is a surface opposite to the front surface. From this, through making the tip of second busbar 202 and corresponding lead-out wire 204 pass same line hole, can reduce the trompil quantity on the back apron, processing is more convenient, and can guarantee the structural strength of back apron. Moreover, through the two junction boxes arranged on the junction box, the two junction boxes can be respectively used for placing the two bypass diodes 6, and the split junction box can effectively reduce the number of cables and reduce junction temperature.

In some embodiments of the present invention, as shown in fig. 1 and fig. 2, the distance between the adjacent sides of two adjacent battery plates 1 along the extending direction of the battery string 100 is a plate interval, a plurality of plate intervals are provided between the plurality of battery plates 1 of each battery string 100, and at least two of the plurality of plate intervals are different. Note that the sheet pitch may be a positive value or a negative value. When the sheet spacing is a positive value, two adjacent battery sheets 1 in the battery string 100 are arranged at intervals to form the sheet gap; when the sheet pitch has a negative value, the ends of two adjacent battery sheets 1 in the battery string 100 overlap, and the width of the overlapping portion of the ends of two adjacent battery sheets 1 is the absolute value of the sheet pitch.

For example, in the example of fig. 1 and 2, each battery string 100 includes seven battery plates 1, and two adjacent battery plates 1 are connected to each other by a first interconnection structure 4 such as a solder ribbon. Two adjacent battery pieces 1 are arranged at intervals along the extending direction of the battery string 100, and the minimum distance between two adjacent battery pieces 1 is the piece interval. Therefore, by making at least two of the plurality of inter-cell distances different, when the cell string 100 needs to connect the first bus bars 201 in parallel, the first bus bars 201 can be arranged at a larger inter-cell gap, so that the risk of splitting the cell sheet 1 can be further reduced, and the reliability of the photovoltaic module 200 can be improved.

In some embodiments of the present invention, referring to fig. 1 and 2, the plurality of inter-cell distances include at least one first inter-cell distance 2 and a plurality of second inter-cell distances 3, the first inter-cell distance 2 is greater than the second inter-cell distance 3, and at least one second inter-cell distance 3 is disposed along at least one side of the extending direction of the battery string 100 and the first inter-cell distance 2. For example, in this case, the first chip pitch 2 is the width of the chip gap. Therefore, by setting the first inter-sheet distance 2 and the second inter-sheet distance 3, the first inter-sheet distance 2 is larger, so that the first bus bar 201 can be located at the first inter-sheet distance 2 when the battery string 100 is connected with the first bus bar 201, the first bus bar 201 can be prevented from contacting the battery piece 1, and the risk of the battery piece 1 cracking is effectively reduced; because the second sheet interval 3 is smaller, the density of the plurality of battery sheets 1 can be increased, and the photoelectric conversion efficiency of the photovoltaic module 200 per unit area can be effectively improved, so that the output power of the photovoltaic module 200 can be effectively improved.

Further, referring to fig. 1 and 2, at least one second plate interval 3 is respectively disposed on both sides of the first plate interval 2. For example, in the example of fig. 1 and 2, seven battery slices 1 have six slice pitches therebetween, including one first slice pitch 2 and five second slice pitches 3. One side of the first chip pitch 2 has two second chip pitches 3, and the other side of the first chip pitch 2 has three second chip pitches 3. From this, through the aforesaid setting, the both sides of first piece interval 2 can be equipped with two at least battery pieces 1 respectively, when battery cluster 100 passes through the parallelly connected bypass diode 6 of first busbar 201 and second busbar 202, the battery piece 1 quantity of first busbar 201 both sides is comparatively more even, thereby make the battery piece 1 quantity of every bypass diode 6 protection comparatively more even, when effectively avoiding battery piece 1 to produce the hot spot effect, can guarantee bypass diode 6's security, bypass diode 6's inefficacy risk has been reduced.

In some optional embodiments of the present invention, the first interval 2 is S₁Wherein S is₁Satisfies the following conditions: s is more than 3mm₁Less than or equal to 25 mm. Specifically, for example, when S₁When the distance between the first plates is less than or equal to 3mm, the distance between the first plates 2 is too small, and when the battery string 100 is connected with the first bus bars 201, the first bus bars 201 may contact with the adjacent battery plates 1, so that the battery plates 1 are at risk of splitting; when S is₁If the first pitch 2 is too large at > 25mm, the density of the cells 1 of the photovoltaic module 200 is reduced, and the output power of the photovoltaic module 200 is reduced. Thereby, by making S₁Satisfies the following conditions: s is more than 3mm₁Less than or equal to 25mm, first piece interval 2 is comparatively reasonable, when reducing 1 production lobe of a leaf risk of battery, guarantees that photovoltaic module 200 has higher output, has improved photovoltaic module 200's long-term reliability.

In some optional embodiments of the present invention, the second inter-plate distance 3 is S₂Wherein S is₂Satisfies the following conditions: -2mm ≤ S₂Less than or equal to 3 mm. For example, when-2 mm. ltoreq.S₂When the width is less than 0mm, the end parts of two adjacent battery sheets 1 are overlapped along the extending direction of the battery string 100, and the width of the overlapped part of the end parts of the two adjacent battery sheets 1 is | S₂L (i.e., 0mm to 2 mm); when 0mm < S₂When the thickness is less than or equal to 3mm, the adjacent two battery pieces are arranged at intervals of 1, and the width of the piece gap is S₂(i.e., 0mm to 3 mm). Thereby, by making S₂Satisfies the following conditions: -2mm ≤ S₂3mm, second piece interval 3 is less to make the photovoltaic module 200 of the same size can hold more quantity of battery pieces 1, effectively improve photovoltaic module 200 unit area's photoelectric conversion efficiency, further improved photovoltaic module 200's output.

In some embodiments of the present invention, referring to fig. 1 and 2, the number of the battery pieces 1 contained in the first piece interval 2 is N₁A chip pitch between every adjacent two of the plurality of battery chips 1 in the first chip pitch 2 is a second chip pitch 3, where N₁Satisfies the following conditions: n is a radical of₁Not less than 20. When the first pitch 2 of the battery string 100 is one, "the number of battery pieces 1 included in the first pitch 2" refers to the number of battery pieces 1 on either side of the first pitch 2 of the battery string 100; when the first sheet pitch 2 of the battery string 100 is plural, "the number of battery sheets 1 included in the first sheet pitch 2" refers to the number of battery sheets 1 between two adjacent first sheet pitches 2 of the battery string 100, and the number of battery sheets 1 on the side of the outermost first sheet pitch 2 of the battery string 100 away from the other first sheet pitches 2 in the extending direction of the battery string 100.

Thereby, by making N₁Satisfies the following conditions: n is a radical of₁The number of the battery pieces 1 contained in the first piece space 2 is more than or equal to 20, the number of the battery pieces 1 contained in the first piece space 2 is reasonable, when the battery string 100 is connected with the bypass diodes 6 in parallel through the first bus bar 201 and the second bus bar 202, the first bus bar 201 can be located at the first piece space 2, and therefore the number of the battery pieces 1 protected by each bypass diode 6 can be more than 20, the bypass diodes 6 can play a role to the maximum, and the cost of the photovoltaic module 200 can be effectively reduced while the battery pieces 1 are prevented from generating a hot spot effect.

In some embodiments of the present invention, the second bus bar 202 and the first bus bar 201 may be an integral structure. For example, the second bus bar 202 and the first bus bar 201 can be welded into a unitary structure prior to fabrication of the photovoltaic module 200. So set up, the simple structure of second busbar 202 and first busbar 201, in photovoltaic module 200's manufacture process, can save the welding process of second busbar 202 and first busbar 201, thereby can simplify the process flow of subassembly, effectively improve photovoltaic module 200's machining efficiency, and the second busbar 202 and the wholeness of first busbar 201 that set up so are higher, can avoid the junction fracture of second busbar 202 and first busbar 201, thereby can improve the structural strength and the structural stability of second busbar 202 and first busbar 201.

In some embodiments of the present invention, the first interconnection structure 4 includes a first connection section and a second connection section (not shown) connected to each other, the first connection section is a non-flat section, the first connection section is connected to the front surface of the battery piece 1, the second connection section is a flat section, and the second connection section is connected to the back surface of the adjacent battery piece 1. The front surface refers to a main light receiving surface of the cell 1, that is, a surface of the cell 1 or the module directly receiving sunlight, and the back surface is a surface opposite to the front surface. "flat" is to be understood as a flat and thin shape, the dimension in the thickness direction being relatively small compared to the dimension in the width direction. For example, the cross-sectional shape of the first connecting section may be triangular or circular. From this, through setting up foretell first linkage segment and second linkage segment, because first linkage segment is the non-flat section, can reduce the second linkage segment to the area that shelters from of battery piece 1, improve the reflectivity, thereby improve photovoltaic module 200's output, because the second linkage segment is the flat section, the width of second linkage segment is great and thickness is less, when second linkage segment and the welding of corresponding battery piece 1, can increase the area of contact between second linkage segment and the battery piece 1 that corresponds, thereby make to have great welding pulling force between second linkage segment and the battery piece 1, it is more firm to connect, and can reduce back packaging material's thickness, reduce the hidden risk of splitting of battery piece 1.

Other constructions and operations of the photovoltaic module 200 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", 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 of the present application, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.

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:

the battery pack comprises a plurality of battery strings, a plurality of battery strings and a plurality of battery modules, wherein the battery strings are arranged along a string arrangement direction, each battery string comprises a plurality of battery pieces which are arranged along a battery string extension direction perpendicular to the string arrangement direction, at least two adjacent battery pieces of each battery string are arranged at intervals to form piece gaps, and two adjacent battery pieces of each battery string are connected in series through a first interconnection structural member;

the cross bus bar comprises a first bus bar and a second bus bar, the first bus bar extends along the string arrangement direction, the first bus bar is located in the sheet gap and is electrically connected with the first interconnection structural members of the cell strings in the sheet gap, the second bus bar is electrically connected with the first bus bar, and the second bus bar extends along the extension direction of the cell strings.

2. The photovoltaic module of claim 1, wherein the width of the first bus bar is less than the width of the corresponding sheet gap, and an absolute value of a difference between the width of the first bus bar and the width of the corresponding sheet gap is Δ L, wherein Δ L satisfies: delta L is more than or equal to 4mm and less than or equal to 10 mm.

3. The pv module according to claim 1 wherein the cell gaps are formed between two adjacent cells of each cell string, the plurality of cell gaps includes a first cell gap and a plurality of second cell gaps, each of the second cell gaps has a width smaller than that of the first cell gap, the first bus bar is located in the first cell gap, and the cell gaps other than the first cell gap in the pv module are the second cell gaps.

4. The assembly according to claim 1, wherein each of the cells is one-X times of a complete cell, wherein X is a positive integer greater than or equal to 3, the string arrangement direction is a length extension direction of the cells, and the string extension direction is a width extension direction of the cells.

5. The photovoltaic module of claim 4, wherein X further satisfies: x is more than or equal to 3 and less than or equal to 6.

6. The assembly according to claim 1, wherein each of the cells has a length L and a width W₁Wherein, the L, W₁Respectively satisfy: l is more than or equal to 182mm and less than or equal to 240mm, and W is more than or equal to 40mm₁≤80mm。

7. The photovoltaic module according to claim 1, wherein a plurality of grid lines are provided on one side surface of each of the cell pieces in the thickness direction, each of the grid lines extends along the extending direction of the first interconnection structure, and the first interconnection structure is electrically connected to the corresponding grid line, and the number of the grid lines on the one side surface of each of the cell pieces is N, where N satisfies: n is more than or equal to 5 and less than or equal to 7.

8. The photovoltaic module of claim 1, wherein the second bus bar is located at a gap between two adjacent cell strings; or

At least a portion of the second bus bar is located on a back side of the battery string.

9. The photovoltaic module of claim 1, wherein the first bus bar has a width W₂The width of the second bus bar is W₃Wherein, theW is₂、W₃Respectively satisfy: w is not less than 3mm₂≤10mm，3mm≤W₃≤10mm。

10. The photovoltaic module of claim 1, wherein the first bus bar has a thickness T₁The thickness of the second bus bar is T₂Wherein, the T is₁、T₂Respectively satisfy: t is not less than 0.15mm₁≤0.6mm，0.15mm≤T₂≤0.6mm。

11. The photovoltaic module of claim 1, wherein the second bus bar and the first bus bar are a unitary structure.

12. The photovoltaic module according to any one of claims 1 to 11, wherein bypass diodes are connected between both ends of the second bus bar and corresponding ends of the plurality of cell strings, respectively.

13. The photovoltaic module of claim 12, further comprising:

a plurality of second interconnection structures, the second interconnection structures are electrically connected with the battery plates at two ends of the plurality of battery strings along the extension direction of the battery strings, and one end of each second interconnection structure, which is far away from the center of the battery string, extends to exceed one side edge, which is far away from the center of the battery string, of the corresponding battery plate;

a plurality of tip bus bars, it is a plurality of the tip bus bar is located a plurality of respectively the edge of battery cluster extending direction's both ends, every the tip bus bar is followed the cluster direction of arranging extends, every the tip bus bar is with a plurality of battery cluster the second interconnect structure all links to each other so that it is a plurality of battery cluster parallel connection, every be equipped with the lead-out wire on the tip bus bar, bypass diode connects the tip of second bus bar and corresponding between the lead-out wire.

14. The photovoltaic module of claim 13, wherein the pinout extends in a direction in which the cell string extends.

15. The photovoltaic module according to claim 14, wherein the second bus bar and the corresponding lead-out line are opposed to each other in the cell string extending direction; or

The second bus bars and the corresponding outgoing lines are arranged in a staggered mode along the serial arrangement direction.

16. The photovoltaic module of claim 13, wherein the pinouts extend in the string direction.

17. The photovoltaic module of claim 13, further comprising:

a front cover plate;

the back cover plate is arranged on one side of the front cover plate in the thickness direction, the plurality of battery strings are positioned between the front cover plate and the back cover plate, and the back cover plate is provided with two wire passing holes which are communicated along the thickness direction of the back cover plate;

the two junction boxes are arranged on the surface of one side, far away from the front cover plate, of the back cover plate, each bypass diode is arranged in the corresponding junction box, and the end part of the second bus bar and the corresponding outgoing line respectively penetrate through the same wire passing hole to be connected with the corresponding bypass diode.

18. The assembly defined in any one of claims 1 to 11, wherein the first interconnecting structure comprises a first connecting section and a second connecting section connected to each other, the first connecting section being a non-flat section connected to the front side of the cell sheet, the second connecting section being a flat section connected to the back side of the adjacent cell sheet.