Photovoltaic module and photovoltaic system

Abstract

The utility model is suitable for the technical field of photovoltaic modules, and provides a photovoltaic module and a photovoltaic system, the photovoltaic module comprises a plurality of battery strings, a bus bar and a single junction box; the plurality of battery strings are arranged in parallel; when the number of the battery strings is an even number, the two battery strings in the middle are sequentially connected with the battery strings on the two sides, and the two battery strings on the outermost side are connected; outgoing lines of the bus bars are led out from the two battery strings in the middle and are connected with a single junction box; under the condition that the number of the battery strings is an odd number, the single battery string located in the middle and any adjacent battery string of the single battery string are sequentially connected with the battery strings on the two sides, and the two battery strings located on the outermost side are connected; and a leading-out wire of the bus bar is led out from the single battery string in the middle and any adjacent battery string and is connected with a single junction box. According to the photovoltaic assembly and the photovoltaic system provided by the utility model, the cost of the junction box of the photovoltaic assembly is reduced, and the process yield and the aesthetic property of the photovoltaic assembly are improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of photovoltaic components, and in particular relates to a photovoltaic component and a photovoltaic system. Background Art

[0002] Conventional photovoltaic modules require at least two split junction boxes with bypass diodes, which are expensive. Furthermore, the lead wires are bent, and it is difficult to drill and align holes in the backsheet and film, affecting the production yield. Furthermore, the holes are prone to light leakage, affecting the aesthetics of the photovoltaic module.

[0003] like Figures 1 to 3 As shown, the battery strings of conventional photovoltaic modules are welded to the busbars, and different battery strings are connected end to end in the same direction to form two mirror-symmetrical series battery string groups. The two series battery string groups are connected in parallel in the middle, and the positive and negative output terminals of the photovoltaic module are located at both ends. The busbars form three groups of lead wires, and the three groups of lead wires are respectively connected to three split junction boxes. Utility Model Content

[0004] The embodiments of the present invention provide a photovoltaic module and a photovoltaic system, aiming to solve the problem of high cost of conventional photovoltaic module junction boxes.

[0005] The embodiment of the present utility model provides a photovoltaic assembly, comprising: a plurality of battery strings, a bus bar and a single junction box;

[0006] The multiple battery strings are arranged in parallel in sequence, the number of the battery strings is greater than or equal to 4, and the number of batteries included in each battery string is the same; the multiple battery strings are connected by the bus bar;

[0007] When the number of battery strings is even, the two battery strings in the middle are connected to the battery strings on both sides in sequence, and the two battery strings on the outermost sides are connected; the lead wires of the bus bar are led out from the two battery strings in the middle and connected to the single junction box;

[0008] When the number of battery strings is an odd number, the single battery string located in the middle and any adjacent battery string of the single battery string are connected to the battery strings on both sides in sequence, and the two battery strings located on the outermost sides are connected; the lead-out wires of the bus bar are led out from the single battery string located in the middle and any adjacent battery string, and are connected to the single junction box.

[0009] In some embodiments, when the number of battery strings is a multiple of 4, the lead-out wire is located on a first side of the photovoltaic component, where the first side is a side of the photovoltaic component where a target bus bar exists, and the target bus bar is a bus bar used to connect the two outermost battery strings.

[0010] In some embodiments, when the number of the battery strings is an even number and is not a multiple of 4, the lead-out wire is located on a second side of the photovoltaic assembly, where the second side is the other side of the photovoltaic assembly opposite to the first side.

[0011] In some embodiments, when the number of the battery strings is an odd number, the position of the lead-out line is determined based on the adjacent battery strings of the single battery string.

[0012] In some embodiments, when the target bus bar is located on the front of the photovoltaic module, the distance between the target bus bar and the bus bar on the same side exceeds a preset distance, or an insulating spacer is provided between the target bus bar and the bus bar on the same side.

[0013] In some embodiments, when the target bus bar is located on the back side of the photovoltaic module, the thickness of the target bus bar is determined based on a predetermined resistance.

[0014] In some embodiments, when the number of the battery strings is 12, the plurality of battery strings are divided into 6 battery string groups, each battery string group includes 2 battery strings connected in series;

[0015] The first end of the first battery string group is connected to the first end of the second battery string group, and the second end of the first battery string group is connected to the second end of the second battery string group;

[0016] The first end of the third battery string group is connected to the first end of the fourth battery string group, and the second end of the third battery string group is connected to the second end of the fourth battery string group;

[0017] The first end of the fifth battery string group is connected to the first end of the sixth battery string group, and the second end of the fifth battery string group is connected to the second end of the sixth battery string group;

[0018] The first end of the first battery string group is connected to the first end of the third battery string group and the first end of the fourth battery string group respectively;

[0019] The second end of the first battery string group is connected to the second end of the fifth battery string group and the second end of the sixth battery string group respectively;

[0020] Lead wires of the bus bar are led out from the second end of the third battery string group and the first end of the fifth battery string group and connected to the single junction box.

[0021] In some embodiments, when the number of the battery strings is 6, the middle two battery strings of the plurality of battery strings are the third battery string and the fourth battery string;

[0022] The bus bar is led out from the positive electrode of the third battery string and the negative electrode of the fourth battery string and is connected to the single junction box;

[0023] The negative electrode of the third battery string is connected to the positive electrode of the second battery string, and the negative electrode of the second battery string is connected to the positive electrode of the first battery string;

[0024] The positive electrode of the fourth battery string is connected to the negative electrode of the fifth battery string, and the positive electrode of the fifth battery string is connected to the negative electrode of the sixth battery string;

[0025] The positive electrode of the sixth battery string is connected to the negative electrode of the first battery string.

[0026] In some embodiments, the lead wires of the busbar are connected to the output end of the photovoltaic module.

[0027] An embodiment of the present invention further provides a photovoltaic system, comprising: a plurality of photovoltaic modules as described in any one of the above items.

[0028] The photovoltaic module and photovoltaic system provided by the present invention reduce the multiple junction boxes of a conventional photovoltaic module to a single junction box by changing the layout of the battery strings in the photovoltaic module. Only one set of bus bar lead-out wires is required to be led out from the battery string located in the middle, so that the positive output terminal and the negative output terminal of the photovoltaic module are arranged on one side of the middle battery string and connected to a single junction box, thereby reducing the junction box cost of the photovoltaic module. At the same time, there is only one set of bus bar lead-out wires, so only one hole is required to be opened in the rear film and backboard of the photovoltaic module, the process yield is higher, the light leakage problem at the opening is also improved, and the back of the photovoltaic module is more symmetrical and beautiful. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is one of the structural diagrams of photovoltaic modules provided by the prior art;

[0030] Figure 2 This is the second structural diagram of a photovoltaic module provided by the prior art;

[0031] Figure 3 This is the third structural diagram of a photovoltaic module provided by the prior art;

[0032] Figure 4 This is one of the structural diagrams of the photovoltaic assembly provided by the embodiment of the present utility model;

[0033] Figure 5 This is the second structural diagram of the photovoltaic assembly provided by the embodiment of the present utility model;

[0034] Figure 6 This is the third structural diagram of the photovoltaic assembly provided by the embodiment of the present utility model;

[0035] Figure 7 This is the fourth structural diagram of the photovoltaic assembly provided by the embodiment of the present utility model;

[0036] Figure 8 This is the fifth structural diagram of the photovoltaic assembly provided by the embodiment of the present utility model;

[0037] Figure 9 This is the sixth structural diagram of the photovoltaic assembly provided by the embodiment of the present utility model;

[0038] Figure 10 This is the seventh structural diagram of the photovoltaic assembly provided by the embodiment of the present utility model;

[0039] Figure 11 This is the eighth structural diagram of the photovoltaic assembly provided by the embodiment of the present utility model;

[0040] Figure 12 This is the ninth structural diagram of the photovoltaic assembly provided by the embodiment of the present utility model;

[0041] Figure 13 This is the tenth structural diagram of the photovoltaic assembly provided by the embodiment of the present utility model;

[0042] Figure 14 This is the eleventh structural diagram of the photovoltaic assembly provided by the embodiment of the present utility model;

[0043] Figure 15 This is the twelfth structural diagram of the photovoltaic assembly provided by the embodiment of the present utility model;

[0044] Figure 16 This is the thirteenth structural diagram of the photovoltaic assembly provided by the embodiment of the present utility model. DETAILED DESCRIPTION

[0045] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0046] References to "embodiments" or "implementations" in this disclosure mean that a particular feature, component, or characteristic described in connection with an embodiment or implementation may be included in at least one embodiment of the disclosure. The appearance of such phrases in various places in the specification does not necessarily refer to the same embodiment, nor do they constitute independent or alternative embodiments that are mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0047] In the description of the present invention, it should be understood that the terms "length", "width", "up", "down", "left", "right", "horizontal", "top", "bottom", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do 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 invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the said features. In the description of the present invention, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0048] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections, or mutual communication; direct connections or indirect connections through an intermediate medium; and internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0049] Conventional photovoltaic modules provided by the prior art are Figures 1 to 3 As shown. Figure 1 , the battery string 10 is connected to the bus bar 20 along one direction with the head and tail connected by welding strips. Figure 2 Each split junction box 30 has a bypass diode 301, and the junction box 30 also has a cable 302 and a connector 303. The cable 302 includes a positive cable and a negative cable, and the cables 302 are located at both ends of the photovoltaic module. Figure 3 , connecting the positive output terminal 40 and the negative output terminal 50 of the photovoltaic module to the cable 302.

[0050] The following combination Figures 4 to 16 The photovoltaic assembly and photovoltaic system provided by the embodiments of the present utility model are described in detail.

[0051] Figure 4 This is one of the schematic diagrams of the structure of the photovoltaic module provided by the embodiment of the present utility model. Figure 4 As shown, an embodiment of the present invention provides a photovoltaic assembly, comprising: a plurality of battery strings 10, a bus bar 20 and a single junction box 30;

[0052] Multiple battery strings 10 are arranged in parallel and the number of battery strings is greater than or equal to 4, and each battery string 10 includes the same number of batteries; the multiple battery strings 10 are connected by a bus bar 20;

[0053] When the number of battery strings is even, the two battery strings in the middle are connected to the battery strings on both sides in sequence, and the two battery strings on the outermost sides are connected; the lead wires of the bus bar 20 are led out from the two battery strings in the middle and connected to a single junction box 30;

[0054] When the number of battery strings is odd, the single battery string located in the middle and any adjacent battery string of the single battery string are connected to the battery strings on both sides in sequence, and the two battery strings located on the outermost sides are connected; the lead wires of the bus bar 20 are led out from the single battery string located in the middle and any adjacent battery string, and are connected to a single junction box 30.

[0055] It should be noted that each battery string has the same number of batteries connected in series, and the batteries in the battery string are connected in the following manner: the positive electrode of the first battery is connected to the negative electrode of the second battery, the positive electrode of the second battery is connected to the negative electrode of the third battery, the positive electrode of the third battery is connected to the negative electrode of the fourth battery, and so on, until all batteries are connected.

[0056] In the embodiment of the present invention, multiple battery strings 10 are arranged in parallel from left to right. The battery strings mentioned in the subsequent embodiments are all arranged from left to right.

[0057] In actual implementation, Figures 4 to 7 As shown, when arranging battery strings, they are no longer connected end to end from left to right to form a series circuit. Instead, they are connected in series from the center to the sides using short bus bars, reaching the outermost battery strings. The two outermost battery strings are connected by a long bus bar. The two battery strings in the middle are not connected by a bus bar, forming a series structure with the two battery strings in the middle as the starting and ending points. The bus bar leads are led from the positive and negative terminals of the two battery strings in the middle, and a single split junction box is installed through the lead wires.

[0058] It is understandable that when the number of battery strings is an even number, the middle position corresponds to two battery strings, that is, the two battery strings located in the middle can be directly determined. For example: when the number of battery strings is 4, the second and third battery strings are the two battery strings located in the middle; when the number of battery strings is 6, the third and fourth battery strings are the two battery strings located in the middle; when the number of battery strings is 8, the fourth and fifth battery strings are the two battery strings located in the middle, and so on.

[0059] When the number of battery strings is odd, the middle position corresponds to only a single battery string, and the two battery strings in the middle are composed of the single battery string in the middle and any adjacent battery strings of the battery string. For example, when there are five battery strings, the second and third battery strings are determined to be the two battery strings in the middle, or the third and fourth battery strings are determined to be the two battery strings in the middle. When there are seven battery strings, the third and fourth battery strings are determined to be the two battery strings in the middle, or the fourth and fifth battery strings are determined to be the two battery strings in the middle, and so on.

[0060] In some embodiments, the lead wires of the busbar 20 are connected to the output terminals of the photovoltaic modules.

[0061] It is understandable that if Figure 4 As shown, under this structural design, the positive output terminal 40 and the negative output terminal 50 of the photovoltaic module will be located in the middle of the photovoltaic module, and only a junction box with a bypass diode needs to be connected.

[0062] In some embodiments, when the number of battery strings is a multiple of 4, the lead-out wire is located on a first side of the photovoltaic component, where the first side is a side of the photovoltaic component where a target bus bar exists, and the target bus bar is a bus bar used to connect the two outermost battery strings.

[0063] It can be understood that the target bus bar connecting the two outermost battery strings is a long bus bar.

[0064] like Figure 4 As shown, when the number of battery strings is 4, the target bus bar and the lead wire are located on the same side.

[0065] like Figure 8 As shown, when the number of battery strings is 8, the target bus bar and the lead wire are located on the same side.

[0066] In some embodiments, when the number of battery strings is an odd number, the position of the lead-out line is determined based on the adjacent battery strings of the single battery string.

[0067] like Figure 5 As shown, when the number of battery strings is 5, if the second battery string and the third battery string are two battery strings located in the middle, the target bus bar and the lead wire are located on different sides.

[0068] like Figure 6 As shown, when the number of battery strings is 5, if the third battery string and the fourth battery string are two battery strings located in the middle, the target bus bar and the lead wire are located on the same side.

[0069] Optionally, when all battery strings are connected in series, it is only necessary to set the target bus bar on one side of the photovoltaic module, that is, it is only necessary to connect the long bus bar on one side.

[0070] In some embodiments, when the number of battery strings is an even number and is not a multiple of 4, the lead wires are located on a second side of the photovoltaic module, where the second side is the other side of the photovoltaic module opposite to the first side.

[0071] like Figure 7 As shown, when the number of battery strings is 6, the target bus bar and the lead wire are located on different sides.

[0072] In some embodiments, when the target bus bar is located on the front of the photovoltaic module, the distance between the target bus bar and the bus bar on the same side exceeds a preset distance, or an insulating spacer is provided between the target bus bar and the bus bar on the same side.

[0073] like Figure 9 As shown in the figure, when there are 6 battery strings, the middle two battery strings of the 6 battery strings are the third and fourth battery strings. The negative electrode of the third battery string is connected to the positive electrode of the second battery string via a short bus bar, and the negative electrode of the second battery string is connected to the positive electrode of the first battery string via a short bus bar. The positive electrode of the fourth battery string is connected to the negative electrode of the fifth battery string via a short bus bar, and the positive electrode of the fifth battery string is connected to the negative electrode of the sixth battery string via a short bus bar. The positive electrode of the sixth battery string is connected to the negative electrode of the first battery string via a long bus bar.

[0074] like Figure 10 As shown, the lead wires of the bus bar are led out from the positive pole of the third battery string and the negative pole of the fourth battery string and connected to a single junction box.

[0075] It is understandable that the long busbar connecting the two outermost battery strings can be stacked with other busbars on the same side, with the layers separated by insulating spacers.

[0076] like Figure 11 As shown, the target bus bar refers to the long bus bar 201 , and the same-side bus bars refer to the short bus bar 202 and the short bus bar 203 on the same side as the long bus bar 201 .

[0077] It should be noted that the outermost two battery strings are the first and sixth battery strings, which are connected via long busbar 201. The negative electrode of the third battery string is connected to the positive electrode of the second battery string via short busbar 203, and the positive electrode of the fourth battery string is connected to the negative electrode of the fifth battery string via short busbar 203. Insulating spacers 204 separate the short busbars 202, 203, and long busbar 201.

[0078] like Figure 12 and Figure 13As shown, the distance between the long bus bar and the two short bus bars on the same side needs to exceed the preset distance to ensure that the long bus bar and the two short bus bars on the same side are staggered and do not affect each other. The preset distance can be, for example, 5 mm or other distances, which are not specifically limited here.

[0079] Figure 13 A long bus bar is used to directly connect the two outermost battery strings. Figure 12 The two outermost battery strings use two more short bus bars, so Figure 12 The length of the medium and long busbar is less than Figure 13 Length of the medium and long busbars.

[0080] In some embodiments, when the target bus bar is located on the back side of the photovoltaic module, the thickness of the target bus bar is determined based on the size of the preset resistance.

[0081] It is understandable that when the target busbar is stacked with the busbar on the same side, the film on the stacked portion on the front of the photovoltaic module is thicker than the other portions, resulting in a bulge on one side of the photovoltaic module. Therefore, the target busbar can be placed on the back side of the photovoltaic module to reduce the bulge and control the thickness of the target busbar according to the required resistance value.

[0082] In some embodiments, when the number of battery strings is 6, the middle two battery strings of the plurality of battery strings are the third battery string and the fourth battery string;

[0083] The bus bar is led out from the positive terminal of the third battery string and the negative terminal of the fourth battery string and connected to a single junction box;

[0084] The negative electrode of the third battery string is connected to the positive electrode of the second battery string, and the negative electrode of the second battery string is connected to the positive electrode of the first battery string;

[0085] The positive electrode of the fourth battery string is connected to the negative electrode of the fifth battery string, and the positive electrode of the fifth battery string is connected to the negative electrode of the sixth battery string;

[0086] The positive terminal of the sixth battery string is connected to the negative terminal of the first battery string.

[0087] like Figure 7 As shown, when the number of battery strings is 6, the middle two battery strings of the 6 battery strings are the third battery string and the fourth battery string. The third battery string serves as the starting point of the series connection, and the fourth battery string serves as the end point of the series connection.

[0088] Starting from the third battery string, the third battery string is connected to the second battery string and the first battery string in sequence, that is, the negative electrode of the third battery string is connected to the positive electrode of the second battery string through a short bus bar, and the negative electrode of the second battery string is connected to the positive electrode of the first battery string through a short bus bar.

[0089] The first battery string is then connected to the sixth battery string, which is then connected to the fifth and fourth battery strings in sequence. This means the negative electrode of the first battery string is connected to the positive electrode of the sixth battery string via a long bus bar, and the negative electrode of the sixth battery string is connected to the positive electrode of the fifth battery string via a short bus bar. The negative electrode of the fifth battery string is then connected to the positive electrode of the fourth battery string via a short bus bar, returning to the fourth battery string as the final destination.

[0090] In some embodiments, when the number of battery strings is 12, the plurality of battery strings are divided into 6 battery string groups, each battery string group including 2 battery strings connected in series;

[0091] The first end of the first battery string group is connected to the first end of the second battery string group, and the second end of the first battery string group is connected to the second end of the second battery string group;

[0092] The first end of the third battery string group is connected to the first end of the fourth battery string group, and the second end of the third battery string group is connected to the second end of the fourth battery string group;

[0093] The first end of the fifth battery string group is connected to the first end of the sixth battery string group, and the second end of the fifth battery string group is connected to the second end of the sixth battery string group;

[0094] The first end of the first battery string group is connected to the first end of the third battery string group and the first end of the fourth battery string group respectively;

[0095] The second end of the first battery string group is connected to the second end of the fifth battery string group and the second end of the sixth battery string group respectively;

[0096] Lead lines of the bus bar are led out from the second end of the third battery string group and the first end of the fifth battery string group and connected to a single junction box.

[0097] like Figure 14 and Figure 15 As shown in the figure, when the number of battery strings is 12, the 12 battery strings can be grouped in pairs, with each battery string group containing 2 battery strings connected in series. Figure 7 On the basis of the battery, six mirror-symmetrical battery strings are added, forming a structure of two rows and six columns.

[0098] The following describes the connection method of 12 battery strings from left to right and from top to bottom.

[0099] The first row has 6 battery strings. Starting from the third battery string in the middle, the second battery string and the first battery string are connected in sequence. The first battery string is connected to the sixth battery string through a long bus bar. The sixth battery string is connected to the fifth battery string and the fourth battery string in sequence, that is, returning to the fourth battery string in the middle as the end point.

[0100] The second row has 6 battery strings, starting from the ninth battery string in the middle, connecting the eighth battery string and the seventh battery string in sequence. The seventh battery string is connected to the twelfth battery string through a long bus bar. The twelfth battery string is connected to the eleventh battery string and the tenth battery string in sequence, that is, returning to the tenth battery string in the middle as the end point.

[0101] The long bus bars on both sides of the photovoltaic module can be stacked or staggered with other bus bars on the same side, or the long bus bars can be arranged on the back side of the photovoltaic module.

[0102] like Figure 15 and Figure 16 As shown, the busbars extend from the two middle battery strings and connect to a junction box. The two middle battery strings could be the third and fourth battery strings, or the ninth and tenth battery strings. The output terminal of the PV module can be located directly in the center of the module, saving busbars and improving aesthetics.

[0103] In actual implementation, the photovoltaic module in the above embodiment can be manufactured through the following two solutions.

[0104] Option 1:

[0105] Step 1: Layout the battery strings and lay the insulating pads;

[0106] Step 2: Solder the short busbars;

[0107] Step 3: Laying long bus bars;

[0108] Step 4: Solder the Interconnections.

[0109] Option 2:

[0110] Step 1: Layout the battery strings and cut the insulation strips;

[0111] Step 2: Pre-combine the insulating gasket and the long busbar, and lay and position the short busbar;

[0112] Step 3: Solder the Interconnections.

[0113] It is understandable that the drawings provided in the embodiments of the present invention are only used as examples. In actual operation, in order to reduce the length of the busbar or improve the aesthetics of the layout, the laying of the busbar can be adjusted according to actual conditions, and no specific limitation is made here.

[0114] The photovoltaic module provided by the embodiment of the present invention can lead out the lead wires of the bus bar from the battery string located in the middle by changing the layout of the battery strings in the photovoltaic module, so that the positive output terminal and the negative output terminal of the photovoltaic module are arranged on one side of the middle battery string, and only one junction box with a bypass diode needs to be connected, thereby reducing the junction box cost of the photovoltaic module; at the same time, there is only one set of lead wires of the bus bar, and only one hole needs to be opened in the rear film and backboard of the photovoltaic module, so the process yield is higher, the light leakage problem at the opening is also improved, and the back of the photovoltaic module is more symmetrical and beautiful.

[0115] The present invention also provides a photovoltaic system comprising a plurality of photovoltaic modules according to any one of the above embodiments, wherein the photovoltaic modules have been described in detail in the above embodiments and will not be described in detail here.

[0116] The photovoltaic system in the embodiment of the present invention uses multiple photovoltaic modules with higher process yield, which reduces the non-silicon cost of the photovoltaic system and improves the overall aesthetics.

[0117] It is understandable that those skilled in the art can, under the guidance of the above embodiments, combine various implementation methods in the above embodiments to obtain technical solutions of multiple implementation methods.

[0118] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A photovoltaic module, characterized in that: include: multiple battery strings, bus bars, and a single junction box; The multiple battery strings are arranged in parallel in sequence, the number of the battery strings is greater than or equal to 4, and the number of batteries included in each battery string is the same; the multiple battery strings are connected by the bus bar; When the number of battery strings is even, the two battery strings in the middle are connected to the battery strings on both sides in sequence, and the two battery strings on the outermost sides are connected; the lead wires of the bus bar are led out from the two battery strings in the middle and connected to the single junction box; When the number of battery strings is an odd number, the single battery string located in the middle and any adjacent battery string of the single battery string are connected to the battery strings on both sides in sequence, and the two battery strings located on the outermost sides are connected; the lead-out wires of the bus bar are led out from the single battery string located in the middle and any adjacent battery string, and are connected to the single junction box.

2. The photovoltaic module according to claim 1, characterized in that When the number of battery strings is a multiple of 4, the lead-out wire is located on a first side of the photovoltaic assembly, where the first side is a side of the photovoltaic assembly where a target bus bar exists, and the target bus bar is a bus bar used to connect the two outermost battery strings.

3. The photovoltaic module according to claim 1, characterized in that When the number of the battery strings is an even number and is not a multiple of 4, the lead-out wire is located on a second side of the photovoltaic assembly, where the second side is the other side of the photovoltaic assembly opposite to the first side.

4. The photovoltaic module according to claim 1, characterized in that In the case that the number of the battery strings is an odd number, the position of the lead-out line is determined based on the adjacent battery strings of the single battery string.

5. The photovoltaic module according to claim 1, characterized in that When the target bus bar is located on the front side of the photovoltaic module, the distance between the target bus bar and the bus bar on the same side exceeds a preset distance, or an insulating spacer is provided between the target bus bar and the bus bar on the same side.

6. The photovoltaic module according to claim 1, characterized in that In the case that the target bus bar is located on the back side of the photovoltaic module, the thickness of the target bus bar is determined based on the size of the preset resistance.

7. The photovoltaic module according to claim 1, characterized in that When the number of the plurality of battery strings is 12, the plurality of battery strings are divided into 6 battery string groups, each battery string group includes 2 battery strings connected in series; The first end of the first battery string group is connected to the first end of the second battery string group, and the second end of the first battery string group is connected to the second end of the second battery string group; The first end of the third battery string group is connected to the first end of the fourth battery string group, and the second end of the third battery string group is connected to the second end of the fourth battery string group; The first end of the fifth battery string group is connected to the first end of the sixth battery string group, and the second end of the fifth battery string group is connected to the second end of the sixth battery string group; The first end of the first battery string group is connected to the first end of the third battery string group and the first end of the fourth battery string group respectively; The second end of the first battery string group is connected to the second end of the fifth battery string group and the second end of the sixth battery string group respectively; Lead wires of the bus bar are led out from the second end of the third battery string group and the first end of the fifth battery string group and connected to the single junction box.

8. The photovoltaic module according to claim 1, characterized in that When the number of the battery strings is 6, the middle two battery strings of the plurality of battery strings are the third battery string and the fourth battery string; The bus bar is led out from the positive electrode of the third battery string and the negative electrode of the fourth battery string and is connected to the single junction box; The negative electrode of the third battery string is connected to the positive electrode of the second battery string, and the negative electrode of the second battery string is connected to the positive electrode of the first battery string; The positive electrode of the fourth battery string is connected to the negative electrode of the fifth battery string, and the positive electrode of the fifth battery string is connected to the negative electrode of the sixth battery string; The positive electrode of the sixth battery string is connected to the negative electrode of the first battery string.

9. The photovoltaic module according to any one of claims 1 to 8, characterized in that: The lead wires of the busbar are connected to the output end of the photovoltaic module.

10. A photovoltaic system, characterized in that: include: A plurality of photovoltaic modules according to any one of claims 1 to 9.

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