Photovoltaic module

Abstract

The utility model relates to a photovoltaic module. The photovoltaic module comprises a plurality of battery strings, a plurality of first bus bars, a plurality of second bus bars, an electrical isolation piece, a plurality of first diodes and a plurality of second diodes, the plurality of first bus bars includes a plurality of intermediate bus bars electrically connected to one of the first electrode and the second electrode of the battery string and a plurality of edge bus bars electrically connected to the other of the first electrode and the second electrode of the battery string. In the thickness direction of the battery string, the electrical isolation piece is arranged between the second bus bar and the battery string. Every two adjacent battery strings are defined as a battery string group, the edge bus bars electrically connected to the two battery strings with the battery string group are connected to a second bus bar in parallel, and in the same battery string group, the two middle bus bars are electrically connected with one end of a first diode and one end of a second diode respectively. And the same second bus bar is electrically connected with the other ends of the first diode and the second diode respectively. And the hot spot temperature of the photovoltaic module can be reduced.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a photovoltaic module. Background Art

[0002] Photovoltaic modules are a type of power generation mechanism that uses the photovoltaic effect of semiconductor materials to convert solar radiation energy into electrical energy. However, in traditional photovoltaic modules, two adjacent battery strings are usually connected in series to form a battery unit, and then the battery unit is connected in parallel to a diode. As a result, when a battery cell in one of the battery strings is blocked, the hot spot energy consumption of the battery unit where the blocked battery cell is located is high, which in turn leads to a high hot spot temperature in traditional photovoltaic modules. Summary of the invention

[0003] Based on this, it is necessary to provide a photovoltaic module to address the problem of high hot spot temperature in traditional photovoltaic modules.

[0004] The present application provides a photovoltaic module, comprising:

[0005] a plurality of battery strings; and

[0006] A plurality of first bus bars, the plurality of first bus bars comprising a plurality of middle bus bars and a plurality of edge bus bars, the middle bus bars being electrically connected to one of the first electrode and the second electrode of the battery string, and the edge bus bars being electrically connected to the other of the first electrode and the second electrode of the battery string;

[0007] A plurality of second bus bars and electrical isolators, wherein the electrical isolators are arranged between the second bus bars and the battery string along the thickness direction of the battery string; defining two adjacent battery strings as a battery string group, wherein the edge bus bars electrically connected to the two battery strings in the battery string group are connected in parallel to one of the second bus bars; and

[0008] A plurality of first diodes and a plurality of second diodes; wherein, in the same battery string group, two intermediate bus bars are electrically connected to one end of the first diode and the second diode respectively, and the same second bus bar is electrically connected to the other end of the first diode and the second diode respectively.

[0009] In one embodiment, the photovoltaic module further comprises:

[0010] A plurality of first lead wires, wherein the first lead wires are electrically connected to the middle bus bar;

[0011] a plurality of second lead wires, wherein the second lead wires are electrically connected to the second bus bar; and

[0012] a first packaging board, wherein the plurality of battery strings are arranged on the first packaging board;

[0013] Wherein, the first packaging board is provided with a plurality of lead-out holes;

[0014] In the same battery string group, two first lead wires pass through the same lead hole and are electrically connected to one end of the first diode and the second diode respectively, and the second lead wire passes through the lead hole and is electrically connected to the other end of the first diode and the second diode respectively.

[0015] In one embodiment, two battery strings adjacent to each other along a first direction are defined as a battery string group;

[0016] The lead-out hole is extended along the first direction.

[0017] In one embodiment, the lead-out hole includes two first parts for the first lead-out wire to pass through, and a second part for the second lead-out wire to pass through;

[0018] Along the first direction, the two first parts of the lead-out hole are connected to opposite sides of the second part;

[0019] The second portion is longitudinally extended along the first direction.

[0020] In one embodiment, the side wall of the first part is configured as a semicircular side wall, and opposite ends of the semicircular side wall along the arc length direction are spaced apart along the second direction to define an opening connected to the second part;

[0021] The first direction and the second direction are perpendicular to the thickness direction of the battery string.

[0022] In one of the embodiments, along the first direction, a distance between two first lead-out lines passing through the same lead-out hole is 12 mm-15 mm.

[0023] In one embodiment, along a direction perpendicular to the thickness of the battery string, the first lead wire and the second lead wire are arranged through the lead hole.

[0024] In one embodiment, two battery strings adjacent to each other along a first direction are defined as a battery string group;

[0025] The second bus bar extends longitudinally along a second direction perpendicular to the first direction. Along the second direction, one end of the second bus bar protrudes out of one end on the same side of the battery string of the adjacent battery string group, and is respectively electrically connected to the edge bus bars electrically connected to the two battery strings of the battery string group.

[0026] In one embodiment, along the second direction, any end of the electrical isolator protrudes out of an end on the same side of the adjacent battery string; or

[0027] Along the second direction, any end of the electrical isolator is flush with an end of the adjacent battery string on the same side.

[0028] In one embodiment, the electrical isolator is fixed to the top of the adjacent battery string.

[0029] In the technical solution of the present application, there is a battery string group in the photovoltaic module of the present application, one of the battery strings is reverse-parallel to the first diode, and the other battery string is reverse-parallel to the second diode. Compared with connecting two battery strings in series and then in parallel to a diode, in the photovoltaic module of the present application, the two battery strings of the battery string group are respectively reverse-parallel to the first diode and the second diode, which can reduce the number of battery cells in the battery string connected in parallel with the diode. When the battery cells in one of the battery strings of the battery string group are blocked, since the number of battery cells in the battery string connected in parallel with the diode is small, the hot spot energy consumption of the battery string where the blocked battery cells are located can be reduced, thereby reducing the hot spot temperature of the photovoltaic module. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 A partial structural schematic diagram of a photovoltaic module according to an embodiment of the present application is shown.

[0031] Figure 2 A schematic structural diagram of a battery string group according to an embodiment of the present application is shown.

[0032] Figure 3 A circuit block diagram of a photovoltaic module according to an embodiment of the present application is shown.

[0033] Figure 4 A schematic structural diagram of a junction box is shown.

[0034] Figure 5 A schematic structural diagram of an extraction hole according to an embodiment of the present application is shown.

[0035] Figure 6 A circuit block diagram of a photovoltaic module according to another embodiment of the present application is shown.

[0036] Reference numerals:

[0037] 10. Photovoltaic modules;

[0038] 100, battery string; 110, battery cell; 101, first battery string; 102, second battery string;

[0039] 211, middle bus bar; 212, edge bus bar; 220, second bus bar;

[0040] 310, a first diode; 320, a second diode;

[0041] 400, electrical isolators;

[0042] 510, first lead wire; 520, second lead wire;

[0043] 610, a first packaging board; 620, a second packaging board;

[0044] 710, a first packaging film; 720, a second packaging film;

[0045] K1, lead-out hole; K11, first part; K111, semicircular arc side wall; K112, opening; K12, second part; K2, via hole;

[0046] 800, junction box; 801, wire threading hole. DETAILED DESCRIPTION

[0047] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0048] In the description of the present application, it should be understood that if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or position relationship indicated by these terms is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0049] In addition, if the terms "first" or "second" appear, these terms are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, if the term "plurality" appears, "plurality" means at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0050] In this application, unless otherwise clearly specified and limited, if the terms "installed", "connected", "connected", "fixed" and the like appear, these terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0051] In the present application, unless otherwise clearly specified and limited, if there is a description that a first feature is "above" or "below" a second feature, etc., or similar descriptions appear, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0052] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element. If an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element at the same time.

[0053] Figure 1 The structure diagram of a photovoltaic module 10 according to an embodiment of the present application is shown. Figure 2 The structure diagram of a battery string group according to an embodiment of the present application is shown. Figure 3 A circuit block diagram of a photovoltaic assembly 10 according to an embodiment of the present application is shown.

[0054] See also Figure 1-Figure 3 An embodiment of the present application provides a photovoltaic assembly 10, including a plurality of battery strings 100, a plurality of first bus bars, a plurality of second bus bars 220, a plurality of first diodes 310, a plurality of second diodes 320 and an electrical isolation member 400.

[0055] The plurality of first bus bars include a plurality of middle bus bars 211 and a plurality of edge bus bars 212 . The middle bus bars 211 are electrically connected to one of the first electrodes and the second electrodes of the battery string 100 , and the edge bus bars 212 are electrically connected to the other of the first electrodes and the second electrodes of the battery string 100 .

[0056] The battery string 100 includes a plurality of battery cells 110 connected in series, the first electrode of the battery string 100 may be one of the positive electrode and the negative electrode of the series circuit formed by the plurality of battery cells 110 of the battery string 100 connected in series, and the second electrode of the battery string 100 may be the other of the positive electrode and the negative electrode of the series circuit formed by the plurality of battery cells 110 of the battery string 100 connected in series. Figure 3 In the illustrated embodiment, the first electrode is a positive electrode and the second electrode is a negative electrode. In the battery string group, the first electrode of one battery string 100 is connected in series with the second electrode of another battery string 100 through the same edge bus bar 212, the second electrode of one battery string 100 is electrically connected to an intermediate bus bar 211, and the first electrode of another battery string 100 is electrically connected to another intermediate bus bar 211.

[0057] The electrical isolator 400 is disposed between the second bus bar 220 and the battery string 100 along the thickness direction of the battery string 100, defining two adjacent battery strings 100 as a battery string group. The edge bus bars 212 electrically connected on the two battery strings 100 in the battery string group are connected in parallel to a second bus bar 220.

[0058] “There are edge bus bars 212 electrically connected on two battery strings 100 of a battery string group connected in parallel to a second bus bar 220”, which may mean that the edge bus bars 212 electrically connected on two battery strings 100 of each battery string group are connected in parallel to a second bus bar 220, or that the edge bus bars 212 electrically connected on two battery strings 100 of some battery string groups are connected in parallel to a second bus bar 220. In this embodiment, the edge bus bars 212 electrically connected on two battery strings 100 of each battery string group are connected in parallel to a second bus bar 220.

[0059] In the same battery string, two middle bus bars 211 are electrically connected to one end of the first diode 310 and the second diode 320 respectively, and the same second bus bar 220 is electrically connected to the other end of the first diode 310 and the second diode 320 respectively.

[0060] It can be understood that in the photovoltaic module 10 of the present application, one of the battery strings 100 in the battery string group is reverse-parallel to the first diode 310, and the other battery string 100 is reverse-parallel to the second diode 320. Compared with two battery strings connected in series and then in parallel to a diode, in the photovoltaic module 10 of the present application, the two battery strings 100 in the battery string group are respectively reverse-parallel to the first diode 310 and the second diode 320, which can reduce the number of battery cells 110 in the battery string 100 connected in parallel with the diode. When the battery cells 110 in one of the battery strings 100 in the battery string group are blocked, since the number of battery cells 110 in the battery string 100 connected in parallel with the diode is small, the hot spot energy consumption of the battery string 100 where the blocked battery cell 110 is located can be reduced, thereby reducing the hot spot temperature of the photovoltaic module 10.

[0061] It should be noted that, under normal circumstances, the first diode 310 or the second diode 320 reversely connected in parallel with the battery string 100 is in a reverse bias state, the first diode 310 or the second diode 320 is not conducting, and does not affect the normal operation of the photovoltaic module 10; when a battery cell 110 in one of the battery strings 100 is blocked, the other battery cells 110 of the battery string 100 cause the blocked battery cell 110 to reverse bias and become a large resistor. At this time, the first diode 310 or the second diode 320 reversely connected in parallel with the battery string 100 is conducted, so that the current generated by the other battery cells 110 of the battery string 100 can flow out from the first diode 310 or the second diode 320 reversely connected in parallel with the battery string 100, so that the photovoltaic module 10 continues to generate electricity, and the power generation circuit will not be blocked due to problems with a certain battery cell 110.

[0062] In some embodiments, the photovoltaic module 10 further includes a plurality of first lead wires 510, a plurality of second lead wires 520 and a first packaging board 610. The first lead wires 510 are electrically connected to the middle bus bar 211, the second lead wires 520 are electrically connected to the second bus bar 220, a plurality of battery strings 100 are arranged on the first packaging board 610, and a plurality of lead holes K1 are arranged on the first packaging board 610. In the same battery string group, two first lead wires 510 pass through the same lead hole K1 and are electrically connected to one end of the first diode 310 and the second diode 320, respectively, and the second lead wires 520 pass through the lead hole K1 and are electrically connected to the other ends of the first diode 310 and the second diode 320, respectively.

[0063] In this way, two first lead wires 510 and one second lead wire 520 can pass through the same lead hole K1, so that the two battery strings 100 in the same battery string group are respectively reversely connected in parallel to the first diode 310 and the second diode 320. This can reduce the hot spot temperature of the photovoltaic component 10 while reducing the number of openings on the first packaging board 610, which is also beneficial to improving the convenience of wiring.

[0064] Optionally, the photovoltaic assembly 10 further includes a plurality of junction boxes 800 for receiving the first diode 310 and the second diode 320, see Figure 4 Each junction box 800 is provided with three wire threading holes 801 , and the number of the junction boxes 800 is equal to the number of the lead-out holes K1 .

[0065] In the same battery string group, two first lead wires 510 and one second lead wire 520 are respectively connected through the same junction box 800. Specifically, the two first lead wires 510 pass through two threading holes 801 of the junction box 800, and are respectively electrically connected to one end of the first diode 310 and the second diode 320. The second lead wire 520 passes through another threading hole 801 of the junction box 800, and is respectively electrically connected to the other end of the first diode 310 and the second diode 320. In this way, one junction box 800 can be used to realize that two battery strings 100 of a battery string group are respectively reversely connected to the first diode 310 and the second diode 320 in parallel. At the same time, the junction box 800 can also be used to accommodate the first diode 310 and the second diode 320, thereby well protecting the first diode 310 and the second diode 320.

[0066] In some embodiments, a plurality of battery strings 100 of a photovoltaic module 10 are arranged in rows along a first direction F1 and in columns along a second direction F2 perpendicular to the first direction F1. Two battery strings adjacent to each other along the first direction F1 are defined as a battery string group. Two adjacent battery strings 100 in two battery string groups adjacent to each other along the second direction F2 are connected in parallel to the same first diode 310, and the other two adjacent battery strings 100 in two battery string groups adjacent to each other along the second direction are connected in parallel to the same second diode 320.

[0067] In this embodiment, the number of the battery strings 100 of the photovoltaic assembly 10 is 12, the number of the first diodes 310 and the number of the second diodes 320 are both 3, and the number of the lead-out holes K1 and the number of the junction boxes 800 are both 3.

[0068] In this way, a diode can be connected in parallel to each battery string 100. In this way, as long as any battery cell 110 is blocked, the current generated by other battery cells 110 in the battery string 100 where the battery cell 110 is located can flow out from the first diode 310 or the second diode 320 reversely connected in parallel with the battery string 100, so that the photovoltaic component 10 continues to generate electricity. There will be no problem with the power generation circuit being blocked due to a problem with a certain battery cell 110, and the harm caused by the hot spot effect caused by the blocking of the battery cell 110 can be effectively reduced.

[0069] In this embodiment, battery strings adjacent to each other in the first direction F1 are sequentially connected in series to form a battery unit. Thus, a plurality of battery strings 100 are combined to form two battery units adjacent to each other in the second direction F2 and connected in parallel to output voltage to the outside together.

[0070] Optionally, the photovoltaic module 10 also includes a first packaging film 710 arranged between the first packaging board 610 and the multiple battery strings 100, and the first packaging film 710 is provided with multiple vias K2 that are connected to the lead-out holes K1 in a one-to-one correspondence. In the same battery string group, the two first lead wires 510 pass through the same via K2 and the same lead-out hole K1, and are electrically connected to one end of the first diode 310 and the second diode 320, respectively. The second lead wire 520 passes through the via K2 and the lead-out hole K1, and is electrically connected to the other end of the first diode 310 and the second diode 320, respectively.

[0071] In this embodiment, the photovoltaic module 10 also includes a second packaging film 720 arranged on the side of the multiple battery strings 100 away from the first packaging film 710, and a second packaging plate 620 arranged on the side of the second packaging film 720 away from the battery string 100. Along the thickness direction of the battery string 100, the second packaging film 720 is located on the side of the second bus bar 220 away from the electrical isolation member 400.

[0072] The first packaging film 710 and the second packaging film 720 can be bonded between the first packaging plate 610 and the second packaging plate 620 at the periphery of all battery strings 100 by a heat-pressing packaging process to achieve packaging of the battery strings 100 , thereby well protecting the multiple battery strings 100 .

[0073] In some embodiments, two battery strings 100 adjacent to each other along the first direction F1 are defined as a battery string group, and the lead-out hole K1 is extended along the first direction F1.

[0074] In this way, the first lead wire 510 and the second lead wire 520 electrically connected on the two battery strings 100 of the battery string group pass through the same lead-out hole K1, and the lead-out holes K1 are respectively adjacent to the two first lead wires 510 along the first direction F1, which is convenient for the first lead wire 510 to pass out, and the second lead wire 520 can pass through between the two second lead wires 520, so as to facilitate the two battery strings 100 to be respectively reversely connected in parallel to the first diode 310 and the second diode 320.

[0075] In some embodiments, the lead-out hole K1 includes two first parts K11 for the first lead-out line 510 to pass through, and a second part K12 for the second lead-out line 520 to pass through. Along the first direction F1, the two first parts K11 of the lead-out hole K1 are connected to opposite sides of the second part K12, and the second part K12 extends longitudinally along the first direction F1.

[0076] Since the two battery strings 100 of the battery string group are arranged adjacent to each other along the first direction F1, the first lead-out line 510 electrically connected to one of the battery strings 100 can pass through a first portion K11 adjacent to it along the first direction F1, and the first lead-out line 510 electrically connected to the other battery string 100 can also pass through another first portion K11 adjacent to it along the first direction F1, and the second lead-out line 520 can pass through the second portion K12 between the two first portions K11, so that the two battery strings 100 in the same battery string group can be respectively reversely connected in parallel to the first diode 310 and the second diode 320, and the convenience of wiring can also be improved.

[0077] In some embodiments, see Figure 5 The side wall of the first part K11 is constructed as a semicircular side wall K111, and the opposite ends of the semicircular side wall K111 along the arc length direction are spaced along the second direction F2 to define an opening K112 connected to the second part K12, and the first direction F1 and the second direction F2 are perpendicular to the thickness direction of the battery string 100.

[0078] It can be understood that the lead-out hole K1 is constructed as an oblong hole, which not only facilitates the manufacture of the lead-out hole K1 , but also the semicircular side wall K111 can improve the strength of the side wall of the lead-out hole K1 .

[0079] In some embodiments, along the first direction F1 , the distance between two first lead-out wires 510 passing through the same lead-out hole K1 is 12 mm-15 mm.

[0080] If the spacing between the two first lead-out wires 510 passing through the same lead-out hole K1 is too small, it will easily cause the first lead-out wire 510 to contact the adjacent second lead-out wire 520. If the spacing between the two first lead-out wires 510 passing through the same lead-out hole K1 is too large, it will cause the size of the lead-out hole K1 along the first direction F1 to be too large. Therefore, it is necessary to set the spacing between the two first lead-out wires 510 passing through the same lead-out hole K1 within an appropriate range, such as 12mm-15mm. In this way, the first lead-out wire 510 can be prevented from contacting the adjacent second lead-out wire 520, and the size of the lead-out hole K1 along the first direction F1 can be set within an appropriate size range.

[0081] In some embodiments, along a direction perpendicular to the thickness of the battery string 100 , the first lead wire 510 and the second lead wire 520 are disposed through the lead hole K1 .

[0082] On the one hand, the first lead wire 510 and the second lead wire 520 extend in a direction perpendicular to the thickness of the battery string 100, which is beneficial to reducing the length of the first lead wire 510 and the second lead wire 520. On the other hand, the first lead wire 510 and the second lead wire 520 are parallel to each other, which can also prevent the first lead wire 510 or the second lead wire 520 from deviating and causing a short circuit.

[0083] In some embodiments, two battery strings 100 adjacent to each other along a first direction F1 are defined as a battery string group, and the second bus bar 220 extends longitudinally along a second direction F2 perpendicular to the first direction F1. Along the second direction F2, one end of the second bus bar 220 protrudes from one end of the battery string 100 of the adjacent battery string group on the same side, and is respectively electrically connected to the edge bus bars 212 electrically connected to the two battery strings 100 of the battery string group.

[0084] In this way, one end of the same second bus bar 220 can be used to connect the second electrodes of the two battery strings 100 of the battery string group in parallel, and the other end of the second bus bar 220 and the middle bus bar 211 can be led out at the other end of the battery string 100, so that the two battery strings 100 of the battery string group are respectively reversely connected in parallel to the first diode 310 and the second diode 320.

[0085] In some embodiments, along the second direction F2, any end of the electrical isolator 400 protrudes out of an end on the same side of the adjacent battery string 100. Of course, the present application is not limited thereto, and it may also be that along the second direction F2, any end of the electrical isolator 400 is flush with an end on the same side 100 of the adjacent battery string 100.

[0086] In this way, the electrical isolation piece 400 can be used to better electrically isolate the second bus bar 220 on the top side of the battery string 100 from the top of the battery string 100, so that one end of the second bus bar 220 crosses the battery string 100 from the top of the battery string 100 and is electrically connected to the edge bus bar 212 electrically connected to the battery string 100. This can achieve that two battery strings 100 in the same battery string group are respectively reversely connected to the first diode 310 and the second diode 320, while also reducing the probability of short circuits and the like, thereby improving the wiring reliability of the second bus bar 220.

[0087] In some embodiments, the electrical spacer 400 is fixed to the top of adjacent battery strings 100 .

[0088] The electrical isolator 400 can be prevented from being deflected during the connection process of the second bus bar 220 , thereby facilitating improving the connection reliability of the second bus bar 220 .

[0089] The photovoltaic module 10 of the present application can utilize two first lead wires 510 and one second lead wire 520 through the same lead hole K1 to realize that two battery strings 100 in the same battery string group are respectively reversely connected in parallel to the first diode 310 and the second diode 320. This can reduce the hot spot temperature of the photovoltaic module 10 while reducing the number of openings on the first packaging board 610, which is also beneficial to improving the convenience of wiring.

[0090] In some other embodiments, see Figure 6 The photovoltaic assembly 10 includes a plurality of battery strings 100 , a plurality of first bus bars, a plurality of second bus bars 220 , a plurality of first diodes 310 , a plurality of second diodes 320 , and an electrical isolator 400 .

[0091] The multiple battery strings 100 of the photovoltaic module 10 are arranged in rows along a first direction F1 and in columns along a second direction F2 perpendicular to the first direction F1. Two adjacent battery strings 100 along the first direction F1 are defined as a battery string group. In the battery string group, the battery string 100 located on the left side of the battery string group is defined as a first battery string 101, and the battery string 100 located on the right side of the battery string group is defined as a second battery string 102.

[0092] The two battery strings 100 in each battery string group are respectively connected in reverse parallel to the first diode 310 and the second diode 320, and the two first battery strings 101 adjacent along the second direction F2 are respectively connected in parallel with different first diodes 310, and the two second battery strings 102 adjacent along the second direction F2 are respectively connected in parallel with different second diodes 320.

[0093] Specifically, the plurality of first bus bars include a plurality of intermediate bus bars 211 and a plurality of edge bus bars 212 , wherein the intermediate bus bars 211 are electrically connected to one of the first electrodes and the second electrodes of the battery string 100 , and the edge bus bars 212 are electrically connected to the other of the first electrodes and the second electrodes of the battery string 100 .

[0094] Taking the first electrode as the positive electrode and the second electrode as the negative electrode as an example, in the battery string group, the first electrode of the first battery string 101 and the second electrode of the second battery string 102 are connected in series through the same edge bus 212, and the edge bus 212 is electrically connected to a second bus 220, and the second bus 220 is electrically connected to one end of the first diode 310 and the second diode 320 respectively, the second electrode of the first battery string 101 is electrically connected to an intermediate bus 211, the first electrode of the second battery string 102 is electrically connected to another intermediate bus 211, and the two intermediate bus bars 211 electrically connected to the first battery string 101 and the second battery string 102 are electrically connected to the other ends of the first diode 310 and the second diode 320 respectively.

[0095] In the present embodiment, since the two battery strings 100 in each battery string group are respectively connected in reverse parallel to the first diode 310 and the second diode 320, and the two first battery strings 101 adjacent along the second direction F2 are respectively connected in parallel with different first diodes 310, and the two second battery strings 102 adjacent along the second direction F2 are respectively connected in parallel with different second diodes 320, the mutual influence between the two battery strings 100 adjacent along the second direction F2 can be reduced. For example, if there is a battery cell 110 blocked in one of the two battery strings 100 adjacent along the second direction F2, then the voltage across the battery string 100 must be smaller than the voltage across the other battery string 100. However, since the two battery strings 100 adjacent along the second direction F2 are respectively connected in parallel with different diodes, it is possible to prevent one of the two battery strings 100 adjacent along the second direction F2 from charging the other, thereby effectively preventing the hot spot effect, which is beneficial to reducing the hot spot temperature of the photovoltaic module 10. In this embodiment, a plurality of battery strings adjacent to each other along the first direction F1 are connected in series to form a battery unit. Thus, a plurality of battery strings 100 are combined to form two battery units adjacent to each other along the second direction F2 and connected in parallel at the output end to output voltage to the outside together.

[0096] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0097] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.

Claims

1. A photovoltaic module, characterized in that: include: Multiple battery strings; as well as A plurality of first bus bars, the plurality of first bus bars comprising a plurality of middle bus bars and a plurality of edge bus bars, the middle bus bars being electrically connected to one of the first electrode and the second electrode of the battery string, and the edge bus bars being electrically connected to the other of the first electrode and the second electrode of the battery string; A plurality of second bus bars and electrical isolators, wherein the electrical isolators are arranged between the second bus bars and the battery string along the thickness direction of the battery string; two adjacent battery strings are defined as a battery string group, and the edge bus bars electrically connected on the two battery strings in the battery string group are connected in parallel to one of the second bus bars; as well as A plurality of first diodes and a plurality of second diodes; wherein, in the same battery string group, two intermediate bus bars are electrically connected to one end of the first diode and the second diode respectively, and the same second bus bar is electrically connected to the other end of the first diode and the second diode respectively.

2. The photovoltaic module according to claim 1, characterized in that: The photovoltaic module further comprises: A plurality of first lead wires, wherein the first lead wires are electrically connected to the middle bus bar; a plurality of second lead wires, wherein the second lead wires are electrically connected to the second bus bar; and a first packaging board, wherein the plurality of battery strings are arranged on the first packaging board; Wherein, the first packaging board is provided with a plurality of lead-out holes; In the same battery string group, two first lead wires pass through the same lead hole and are electrically connected to one end of the first diode and the second diode respectively, and the second lead wire passes through the lead hole and is electrically connected to the other end of the first diode and the second diode respectively.

3. The photovoltaic module according to claim 2, characterized in that: defining two battery strings adjacent to each other along a first direction as a battery string group; The lead-out hole is extended along the first direction.

4. The photovoltaic module according to claim 3, characterized in that: The lead-out hole comprises two first parts for the first lead-out wire to pass through, and a second part for the second lead-out wire to pass through; Along the first direction, the two first parts of the lead-out hole are connected to opposite sides of the second part; The second portion is longitudinally extended along the first direction.

5. The photovoltaic module according to claim 4, characterized in that: The side wall of the first part is constructed as a semicircular arc side wall, and the opposite ends of the semicircular arc side wall along the arc length direction are spaced along the second direction to define an opening connected to the second part; The first direction and the second direction are perpendicular to the thickness direction of the battery string.

6. The photovoltaic module according to claim 3, characterized in that: Along the first direction, the distance between two first lead-out lines passing through the same lead-out hole is 12 mm-15 mm.

7. The photovoltaic module according to claim 2, characterized in that: The first lead wire and the second lead wire are disposed through the lead hole in a direction perpendicular to the thickness of the battery string.

8. The photovoltaic module according to any one of claims 1 to 7, characterized in that: defining two battery strings adjacent to each other along a first direction as a battery string group; The second bus bar extends longitudinally along a second direction perpendicular to the first direction. Along the second direction, one end of the second bus bar protrudes out of one end on the same side of the battery string of the adjacent battery string group, and is respectively electrically connected to the edge bus bars electrically connected to the two battery strings of the battery string group.

9. The photovoltaic module according to any one of claims 1 to 7, characterized in that: Along the second direction, any end of the electrical isolator protrudes out of an end of the adjacent battery string on the same side; or Along the second direction, any end of the electrical isolator is flush with an end of the adjacent battery string on the same side; The second direction is perpendicular to a thickness direction of the battery string.

10. The photovoltaic module according to any one of claims 1 to 7, characterized in that: The electrical isolator is fixed to the top of the adjacent battery string.

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