A photovoltaic module

Abstract

The utility model discloses a photovoltaic module, including the front glass board, front encapsulation adhesive film, photovoltaic cell layer, back encapsulation adhesive film and backboard who set gradually, photovoltaic cell layer includes the photovoltaic cell string of multiple groups of array arrangement, and each photovoltaic cell string includes multiple pieces of battery piece along linear arrangement and connects in proper order, be provided with at least one group of strip conductive structure between photovoltaic cell layer and backplate, the both ends of every strip conductive structure are connected with the electrode end of not adjacent between adjacent photovoltaic cell string respectively, and strip conductive structure includes metal conductive strip and the first adhesive film strip and second adhesive film strip of wrapping metal conductive strip setting. In the application, the strip conductive structure is used for realizing the electric connection between the electrode ends far away from each other between the photovoltaic cell strings, simplifying the difficulty of the connection between the photovoltaic cell strings, and avoiding increasing the cost of the photovoltaic module.

Description

Technical Field

[0001] This utility model relates to the field of photovoltaic module technology, and in particular to a photovoltaic module. Background Technology

[0002] In recent years, with the increasing market demand for high-power modules, the size of photovoltaic modules has also been increasing to improve the light-receiving area and power generation capacity. In photovoltaic modules, the cells are typically connected in series to form multiple strings, and then these strings are connected in series and parallel to form the cell's circuit structure. However, these series and parallel connections inevitably involve electrical connections between the electrode ends of two strings that are far apart, especially for large-sized photovoltaic modules where the distance between the electrodes of two strings placed opposite each other is even greater. Currently, such electrical connections are mostly achieved using busbars.

[0003] However, to avoid short circuits between the busbar and the solar cell, sufficient space needs to be reserved for the busbar. Even so, during the lamination process of photovoltaic modules, there may still be an unavoidable relative offset between the busbar and the solar cell, which may result in contact between the busbar and the solar cell, reducing the reliability of the photovoltaic module. Utility Model Content

[0004] The purpose of this invention is to provide a photovoltaic module that simplifies the series and parallel connection between photovoltaic cell strings, avoids increasing the size of the photovoltaic module, and thus avoids increasing the cost of the photovoltaic module.

[0005] To solve the above-mentioned technical problems, this utility model provides a photovoltaic module, including a front glass plate, a front encapsulating film, a photovoltaic cell layer, a back encapsulating film and a back sheet stacked in sequence; the photovoltaic cell layer includes multiple sets of photovoltaic cell strings arranged in an array, and each set of photovoltaic cell strings includes multiple cells arranged in a straight line and connected in series.

[0006] The photovoltaic cell layer and the backsheet are provided with at least one set of strip-shaped conductive structures. The two ends of the strip-shaped conductive structures are respectively connected to the non-adjacent electrodes of the adjacent photovoltaic cell strings. The strip-shaped conductive structure includes a metal conductive strip and a first adhesive strip and a second adhesive strip covering the upper and lower surfaces of the metal conductive strip respectively. The upper surface of the metal conductive strip is the surface close to the photovoltaic cell layer.

[0007] In one optional embodiment of this application, the thickness of the metal conductive strip is 50µm to 100µm;

[0008] The thickness of both the first adhesive strip and the second adhesive strip is 100um~150um.

[0009] In one optional embodiment of this application, the upper surface of the metal conductive strip is a strip-shaped V-groove surface; wherein the included angle of the strip-shaped V-groove surface is 110°~160°.

[0010] In an optional embodiment of this application, a PET structural strip is further provided between the upper surface of the metal conductive strip and the first adhesive film strip; the thickness of the PET structural strip is 150um~250um.

[0011] In an optional embodiment of this application, an insulating fluorine coating is further provided between the lower surface of the metal conductive strip and the second adhesive film strip; the thickness of the insulating fluorine coating is 10um~20um.

[0012] In an optional embodiment of this application, the surface of the metal conductive strip is further coated with a PTFE coating.

[0013] In an optional embodiment of this application, each of the solar cells in the photovoltaic cell string is a multi-segment formed by dividing a whole solar cell into segments; the length and width of the whole solar cell are both 182mm~240mm; each photovoltaic cell string includes 20~25 solar cells; the spacing between two adjacent and parallel sets of photovoltaic cell strings is 0.1mm~1.0mm;

[0014] The photovoltaic module has a length of 2400mm to 2600mm and a width of 1200mm to 1400mm.

[0015] In an optional embodiment of this application, the strip-shaped conductive structure is disposed between the back encapsulation film and the backplate; the two ends of the metal conductive strip have bent ends, and the bent ends are electrically connected through the back encapsulation film and the end of the photovoltaic cell string.

[0016] In an optional embodiment of this application, the photovoltaic cell layer includes multiple sets of cell strings; multiple diodes are connected between each set of cell strings; each set of cell strings includes four sets of photovoltaic cell strings arranged in a 2×2 array and connected in parallel with each other, and each cell in each photovoltaic cell string is arranged sequentially along a second direction; each set of cell strings has at least three sets arranged sequentially in a first direction, and the sets of cell strings are connected in series.

[0017] In this configuration, the positive and negative terminals of each photovoltaic cell string in the same battery string group are electrically connected to the cathode and anode of the same diode, respectively.

[0018] In some of the aforementioned battery string groups, the negative electrodes of each photovoltaic cell string in the same battery string group are electrically connected through the strip-shaped conductive structure;

[0019] In another part of the battery string group, the positive electrodes of each photovoltaic cell string in the same battery string group are electrically connected through the strip-shaped conductive structure.

[0020] In one optional embodiment of this application, the battery string group includes a first battery string group, a second battery string group, and a third battery string group arranged sequentially along the first direction; the diode includes a first diode, a second diode, and a third diode; the strip conductive structure includes a first strip conductive structure and a second strip conductive structure.

[0021] In the first battery string group and the second battery string group, the positive electrodes of two adjacent photovoltaic cell strings in the second direction are arranged close to each other, and the negative electrodes are arranged opposite to each other.

[0022] In the first battery string group, the positive terminal of each photovoltaic cell string is electrically connected to the cathode of the first diode, and the negative terminal of each photovoltaic cell string is electrically connected to the anode of the first diode through the first strip-shaped conductive structure.

[0023] In the second battery string group, the positive terminal of each photovoltaic cell string is electrically connected to the cathode of the second diode and to the anode of the first diode, and the negative terminal of each photovoltaic cell string is electrically connected to the anode of the second diode through the second strip-shaped conductive structure.

[0024] In the third battery string group, the negative electrodes of two adjacent photovoltaic cell strings in the second direction are arranged close to each other, and the positive electrodes are arranged away from each other; in the third battery string group, the negative electrode of each photovoltaic cell string is electrically connected to the positive electrode of the second diode, and the positive electrode of each photovoltaic cell string is electrically connected to the anode of the third diode through the second strip-shaped conductive structure and to the anode of the second diode.

[0025] The positive terminal of the first battery string serves as the positive output terminal of the photovoltaic cell layer, and the negative terminal of the third battery string serves as the negative output terminal of the photovoltaic cell layer.

[0026] The photovoltaic module provided by this utility model includes a front glass plate, a front encapsulating film, a photovoltaic cell layer, a back encapsulating film, and a backsheet stacked sequentially. The photovoltaic cell layer includes multiple sets of photovoltaic cell strings arranged in an array, each set of photovoltaic cell strings including multiple cells arranged in a straight line and connected in series. At least one set of strip-shaped conductive structures is provided between the photovoltaic cell layer and the backsheet, and the two ends of the strip-shaped conductive structures are respectively connected to the non-adjacent terminals of adjacent photovoltaic cell strings. The strip-shaped conductive structure includes a metal conductive strip and a first encapsulating film strip and a second encapsulating film strip respectively covering the upper and lower surfaces of the metal conductive strip. The upper surface of the metal conductive strip is the surface closer to the photovoltaic cell layer.

[0027] This application incorporates a strip-shaped conductive structure between the photovoltaic cell layer and the backsheet to achieve electrical connection between the electrodes of two photovoltaic cell strings that are far apart. In addition to a conductive metal strip, the strip-shaped conductive structure further includes a first encapsulant strip and a second encapsulant strip wrapped around the upper and lower surfaces of the metal conductive strip, respectively. During the lamination and extrusion process of the photovoltaic module, the first and second encapsulant strips possess insulating and flexible deformation properties, effectively preventing direct contact and short circuits between the metal conductive strip and the cell. Furthermore, the flexible deformation of the first and second encapsulant strips buffers the mutual compression between the strip-shaped conductive structure and the cell, thus effectively preventing the cell and the strip-shaped conductive structure from shifting. This ensures the reliability of the series-parallel connection of the photovoltaic cell strings through the strip-shaped conductive structure, thereby guaranteeing the reliability of the photovoltaic module. Attached Figure Description

[0028] To more clearly illustrate the technical solutions of the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0029] Figure 1 A cross-sectional structural diagram of a photovoltaic module provided in an embodiment of this application;

[0030] Figure 2 This is a schematic diagram of the strip-shaped conductive structure provided in the embodiments of this application;

[0031] Figure 3 This is a schematic diagram of a circuit structure of a photovoltaic cell in a photovoltaic module provided in an embodiment of this application. Detailed Implementation

[0032] The core of this utility model is to provide a photovoltaic module that achieves series and parallel connection between photovoltaic cell strings by setting a strip-shaped conductive structure between the photovoltaic cell layer and the backsheet. The upper and lower surfaces of the strip-shaped conductive structure are provided with adhesive films to effectively buffer the compression between the strip-shaped conductive structure and the cell, ensuring the reliability of the series and parallel connection of photovoltaic cell strings through the strip-shaped conductive structure.

[0033] To enable those skilled in the art to better understand the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0034] like Figures 1 to 3 As shown, Figure 1 A cross-sectional structural diagram of a photovoltaic module provided in an embodiment of this application; Figure 2 This is a schematic diagram of the strip-shaped conductive structure provided in the embodiments of this application; Figure 3 This is a schematic diagram of a circuit structure of a photovoltaic cell in a photovoltaic module provided in an embodiment of this application.

[0035] In one specific embodiment of this application, the photovoltaic module may include:

[0036] The front glass plate 1, the front encapsulating film 2, the photovoltaic cell layer 3, the back encapsulating film 4, and the back plate 5 are stacked in sequence; the photovoltaic cell layer 3 includes multiple sets of photovoltaic cell strings arranged in an array, and each set of photovoltaic cell strings includes multiple cells arranged in a straight line and connected in series.

[0037] Among them, at least one set of strip-shaped conductive structures 6 are provided between the photovoltaic cell layer 3 and the back sheet 5; the two ends of the strip-shaped conductive structure 6 are respectively connected to the non-adjacent electrodes between adjacent photovoltaic cell strings; and the strip-shaped conductive structure 6 includes a metal conductive strip 63 and a first adhesive film strip 61 and a second adhesive film strip 65 respectively covering the upper and lower surfaces of the metal conductive strip 63; the upper surface of the metal conductive strip 63 is the surface close to the photovoltaic cell layer 3.

[0038] like Figure 1 As shown, in this embodiment, a photovoltaic module is formed by sequentially stacking a front glass plate 1, a front encapsulating film 2, a photovoltaic cell layer 3, a back encapsulating film 4, and a back sheet 5; based on this, the strip-shaped conductive structure 6 can be as follows: Figure 1The strip-shaped conductive structure 6 shown is located between the back sealing film 4 and the back plate 5, or it can be located between the photovoltaic cell layer 3 and the back sealing film 4. In short, the strip-shaped conductive structure 6 should be located between the photovoltaic cell layer 3 and the back plate 5, and each strip-shaped conductive structure 6 can be directly opposite the gap between two rows of adjacent and parallel photovoltaic cell strings; the strip-shaped conductive structure 6 is used to realize the electrical connection between the far-distance electrodes of two photovoltaic cell strings in the photovoltaic cell layer 3.

[0039] Additionally, it should be noted that when the strip-shaped conductive structure 6 is disposed between the back encapsulation film 4 and the backplate 5, both ends of the strip-shaped conductive structure 6 should be bent toward the back encapsulation film 4 and pass through the back encapsulation film 4 before being connected to the end of the photovoltaic cell string.

[0040] It is understandable that photovoltaic cell layer 3 is the circuit structure layer formed by connecting numerous cells in series and parallel. Generally, multiple photovoltaic cell strings are formed between the cells, and each string contains multiple cells connected in series. These strings are arranged in an array, for example... Figure 3 As shown, each photovoltaic cell string has a positive terminal and a negative terminal at both ends, and the photovoltaic cell strings are electrically connected to each other through the electrical connection between the positive and negative terminals.

[0041] Reference Figure 3 To facilitate understanding of the electrical connection between adjacent electrodes of two sets of photovoltaic cell strings via a strip-shaped conductive structure 6, the explanation is based on the array arrangement of the photovoltaic cell strings. Multiple rows of photovoltaic cell strings are arranged sequentially in the first direction, and multiple columns of photovoltaic cell strings are arranged sequentially in the second direction; wherein, the length direction of each photovoltaic cell string is parallel to the second direction.

[0042] Based on this, in this embodiment, adjacent photovoltaic cell strings can be, for example... Figure 3 The photovoltaic strings a1 and a2 shown are adjacent in the first direction, as are photovoltaic strings a3 and a3; correspondingly, the electrode terminals at opposite ends of these two sets of photovoltaic strings are non-adjacent electrode terminals, such as... Figure 3 The terminals between a1- and a2+, a1+ and a2-, a3- and a4+, a3+ and a4-, etc., are all non-adjacent electrode terminals between two adjacent photovoltaic cell strings, and can be electrically connected through the strip-shaped conductive structure 6.

[0043] In this embodiment, the photovoltaic cell strings that are adjacent to each other can also be adjacent in the second direction, for example... Figure 3In the second direction, photovoltaic strings a1 and a3, as well as a2 and a4, are adjacent to each other. Since adjacent strings are clearly on the same straight line, their opposite terminals are not adjacent. Figure 3 The terminals a1- and a3-, as well as a2- and a4-, are non-adjacent electrode terminals. Similarly, the terminals a1- and a3+, a1+ and a3-, a2- and a4+, and a2+ and a4- are also non-adjacent electrode terminals and can be electrically connected through the strip-shaped conductive structure 6.

[0044] In this embodiment, adjacent photovoltaic cell strings can also be two sets of photovoltaic cell strings located in adjacent rows and adjacent columns, equivalent to two sets of photovoltaic cell strings that are diagonally adjacent, for example. Figure 3 In the middle, photovoltaic cell strings a1 and a4, as well as photovoltaic cell strings a2 and a3, belong to two adjacent sets of photovoltaic cell strings; correspondingly, such as Figure 3 As shown, the terminals a1- and a4-, as well as the terminals a2- and a3-, are non-adjacent electrode terminals. Similarly, the terminals a1- and a4+, a1+ and a4-, a2- and a3+, and a2+ and a3- are also non-adjacent electrode terminals and can be electrically connected through the strip-shaped conductive structure 6.

[0045] The above is only to explain which photovoltaic cell strings in photovoltaic cell layer 3 are adjacent photovoltaic cell strings, and which electrode terminals in adjacent photovoltaic cell strings are non-adjacent electrode terminals. However, it is understood that not all non-adjacent electrode terminals need to be electrically connected through the strip conductive structure 6. Specifically, based on the connection requirements of the actual circuit structure, some non-adjacent electrode terminals in adjacent photovoltaic cell strings are electrically connected.

[0046] like Figure 3 As shown, the a2- and a4- ends of photovoltaic cell strings a2 and a4 are located at opposite ends of the photovoltaic module. This is because the strip-shaped conductive structure 6 connecting the a2- and a4- ends should extend from one end of the photovoltaic module to the other, and the length of the strip-shaped conductive structure 6 is approximately the same as the length of the photovoltaic module in the second direction. The a2+ end is located in the middle region of the photovoltaic module, while the a4- end is located at one edge of the photovoltaic module. Therefore, the strip-shaped conductive structure 6 connecting the a2+ and a4- ends is approximately half the length of the photovoltaic module along the second direction.

[0047] Furthermore, each strip-shaped conductive structure 6 can be positioned directly opposite the gap between two adjacent sets of parallel photovoltaic cell strings. For example, it can be positioned directly opposite the gap between photovoltaic cell strings a1 and a2, or it can be positioned directly opposite the gap between photovoltaic cell strings a3 and a4. Figure 3 In the illustrated embodiment, the strip-shaped conductive structure 6 is mainly positioned opposite the gap between two adjacent photovoltaic cell strings in the first battery string group A and the second battery string group B in the first direction, and opposite the gap between two adjacent photovoltaic cell strings in the second battery string group B and the third battery string group C in the first direction. Thus, when the strip-shaped conductive structure 6 is located between the back plate 5 and the photovoltaic cell layer 3, and is laminated together with the front glass plate 1, the front encapsulating film 2, the photovoltaic cell layer 3, the back encapsulating film 4, and the back plate 5, the first film strip 61 and the second film strip 65 that wrap the upper and lower surfaces of the metal conductive strip 63 in the strip-shaped conductive structure 6 can effectively buffer the compression of the battery cells caused by the strip-shaped conductive structure 6, thereby avoiding the problems of battery cell cracking and displacement.

[0048] It is understood that the metal conductive strip 63 in this embodiment is the main structure for realizing the electrical connection between the electrodes of the two photovoltaic cell strings. The upper surface of the metal conductive strip 63 is the surface that is close to the photovoltaic cell layer 3 and the back encapsulation film 4, and the lower surface is the surface of the metal conductive strip 63 that is close to the back plate 5.

[0049] Furthermore, when the strip-shaped conductive structure 6 is disposed between the back sealing film 4 and the backplate 5, the strip-shaped conductive structure 6 and the photovoltaic cell layer 3 are not located on the same structural layer, but are separated by the back sealing film 4. The back sealing film 4 can further isolate the strip-shaped conductive structure 6 and the cell, thereby improving the insulation performance between them. At the same time, in order to achieve electrical connection between the strip-shaped conductive structure 6 and the terminals of the photovoltaic cell string in the photovoltaic cell layer 3, the end of the strip-shaped conductive structure 6 can penetrate through the back sealing film 4. Obviously, the end of the strip-shaped conductive structure 6 should be close to the area where the terminals of the photovoltaic cell string to be connected are located. That is to say, after the end of the strip-shaped conductive structure 6 penetrates through the back sealing film 4, it can be electrically connected to the corresponding terminals.

[0050] As described above, the strip-shaped conductive structure 6 in this application needs to be laminated with other structural layers in the photovoltaic module to form an integral structure; such as Figure 2 As shown, in an optional embodiment of this application, the thickness of the metal conductive strip 63 in the strip conductive structure 6 can be 50um~100um; the thickness of the first adhesive strip 61 and the second adhesive strip 65 can both be 100um~150um.

[0051] In practical applications, the thickness of the metal conductive strip 63 can be between 50µm and 100µm, for example, 50µm, 60µm, 70µm, 80µm, 90µm, or 100µm. Specifically, the metal conductive strip 63 can be a single metal structure or a multi-metal alloy structure selected from copper, aluminum, tin, lead, etc. Correspondingly, the thickness of the first adhesive strip 61 and the second adhesive strip 65 can be the same or slightly different, generally between 100µm and 150µm. Furthermore, the first adhesive strip 61 and the second adhesive strip 65 can be made of soft materials such as EVA (Ethylene Vinyl Acetate Copolymer) film or EPE (Expandable Polyethylene) film, thereby effectively buffering the lamination pressure.

[0052] Based on the above discussion, in this application, a first adhesive strip 61 and a second adhesive strip 65 are respectively provided on the upper and lower surfaces of the metal conductive strip 63. Thus, the first adhesive strip 61 and the second adhesive strip 65 can fully wrap the metal conductive strip 63 from the upper and lower surfaces, and play a role in buffering the extrusion pressure during the photovoltaic module lamination process, avoiding the metal conductive strip 63 from squeezing the battery cell and causing problems such as cell cracking and displacement.

[0053] In addition, when the strip-shaped conductive structure 6 is disposed between the back encapsulation film 4 and the backplate 5, in order to enable the metal conductive strip 63 to be electrically connected to the electrode of the photovoltaic cell string, the end of the metal conductive strip 63 can be further provided with a bent end, mainly a bent end structure towards the photovoltaic cell layer 3, such as an L-shaped bent end or a C-shaped bent end, etc., so that the bent end of the metal conductive strip 63 is inserted into the back encapsulation film 4 and extends to the structural layer where the photovoltaic cell layer 3 is located, and then electrically connected to the electrode of the photovoltaic cell string.

[0054] Building upon this, to further prevent the metal conductive strip 63 from being electrically broken down by the photovoltaic module's current during operation, thus causing a short circuit between the metal conductive strip 63 and the solder ribbon, a PET (Polyethylene Terephthalate) structural strip can be further provided between the upper surface of the metal conductive strip 63 and the first adhesive film strip 61. This serves two purposes: firstly, it increases the rigidity of the material, and secondly, it increases the insulation between the metal conductive layer and the solder ribbon, preventing current breakdown and short circuits with the solder ribbon during photovoltaic module operation. Furthermore, the thickness of this PET structural strip 62 can be between 150µm and 250µm, and as... Figure 2As shown, the two sides of the PET structural strip 62 can protrude slightly upwards and extend to the two sides of the metal conductive strip 63, so that the side of the PET close to the upper surface of the metal conductive strip 63 forms a strip-shaped groove structure similar to wrapping the metal conductive strip 63, thereby more comprehensively insulating the metal conductive strip 63.

[0055] In addition, an insulating fluorine coating 64 can be provided on the lower surface of the metal conductive strip 63 to insulate the lower surface of the metal conductive strip 63. It can be seen that the insulating fluorine coating 64 and the PET structural strip 62 can insulate the metal conductive strip 63 in all directions; the thickness of the insulating fluorine coating 64 can be between 10um and 20um.

[0056] Based on this, in order to further improve the insulation performance of the surface of the metal conductive strip 63, a PTEE coating can be applied to the entire outer surface of the metal conductive strip 63. For example, a thin film of PTEE coating can be formed on the surface of the metal conductive strip 63 by spraying, thereby achieving more comprehensive insulation between the metal conductive strip 63, the welding ribbon, and the battery cell.

[0057] As mentioned above, the strip-shaped conductive structure 6 in this application faces the gap between two adjacent parallel photovoltaic cell strings. Therefore, sunlight incident on the photovoltaic module inevitably shines onto the strip-shaped conductive structure 6 through the gap between the two parallel photovoltaic cell strings. To address this, in another optional embodiment of this application, the upper surface of the metal conductive strip 63 can be further configured as a reflective surface. Specifically, the upper surface of the metal conductive strip 63 can be multiple parallel strip-shaped V-grooves, where the included angle of the strip-shaped V-grooves can be 110°~160°. This is equivalent to forming an alternating inclined surface tilted in two different directions on the upper surface of the metal conductive strip 63, achieving the effect of reflecting the incident light, allowing the reflected sunlight to re-enter the cell, thereby improving the utilization rate of sunlight by the photovoltaic module to a certain extent, and thus improving the working efficiency of the photovoltaic module. Furthermore, as... Figure 2 As shown, the surfaces of the PET structural layer and the upper surface of the metal conductive strip 63 that are in contact with each other should have the same shape, so as to achieve a tight fit between the two.

[0058] Based on any of the above embodiments, such as Figure 3 As shown, in an optional embodiment of this application, the photovoltaic cell layer 3 in the photovoltaic module may include:

[0059] Multiple sets of battery strings; multiple diodes are connected between each set of battery strings. Each set of battery strings includes four sets of photovoltaic cell strings arranged in a 2×2 array and connected in parallel. Each photovoltaic cell string has cells arranged sequentially along the second direction. Each set of battery strings has at least three sets arranged sequentially in the first direction, and the sets of battery strings are connected in series.

[0060] In this configuration, the positive and negative terminals of each photovoltaic cell string in the same battery string group are electrically connected to the cathode and anode of the same diode, respectively.

[0061] In some battery string groups, the negative terminals of each photovoltaic cell string in the same battery string group are electrically connected through a strip-shaped conductive structure 6;

[0062] In another part of the battery string group, the positive terminals of each photovoltaic cell string in the same battery string group are electrically connected through a strip-shaped conductive structure 6.

[0063] In this embodiment, by connecting the positive terminals of all photovoltaic cell strings in the same battery string group to the cathode of the same diode and the negative terminals to the anode of the same diode, the photovoltaic cell strings in the same battery string group are connected in parallel, thus preventing each photovoltaic cell string from being reverse-charged. In addition, the positive terminals of each photovoltaic cell string in the same battery string group are electrically connected through a strip-shaped conductive structure 6, or the positive terminals of each photovoltaic cell string in the same battery string group are electrically connected through a strip-shaped conductive structure 6. Thus, when each battery string group is working normally, the strip-shaped conductive structures 6 can realize the series connection between each battery string group. When there is a faulty battery string in one of the battery string groups, the battery string group can be short-circuited by the diode, thereby preventing the faulty battery string group from being charged by the normally generating battery string group and causing serious hot spot problems.

[0064] For ease of understanding, Figure 3 In the embodiment shown, the battery string group includes a first battery string group A, a second battery string group B, and a third battery string group C arranged sequentially along a first direction; the diodes include a first diode D1, a second diode D2, and a third diode D3; the strip conductive structure 6 includes a first strip conductive structure 601 and a second strip conductive structure 602.

[0065] In the first battery string group A and the second battery string group B, the positive electrodes of two adjacent photovoltaic cell strings in the second direction are arranged close to each other, and the negative electrodes are arranged away from each other.

[0066] In the first battery string group A, the positive terminal of each photovoltaic cell string is electrically connected to the cathode of the first diode D1, and the negative terminal of each photovoltaic cell string is electrically connected to the anode of the first diode D1 through the first strip conductive structure 601.

[0067] In the second battery string group B, the positive terminal of each photovoltaic cell string is electrically connected to the cathode of the second diode D2 and to the anode of the first diode D1. The negative terminal of each photovoltaic cell string is electrically connected to the anode of the second diode D2 through the second strip conductive structure 602.

[0068] In the third battery string group C, the negative terminals of two adjacent photovoltaic cell strings in the second direction are arranged close to each other, and the positive terminals are arranged opposite to each other; in the third battery string group C, the negative terminal of each photovoltaic cell string is electrically connected to the positive terminal of the second diode D2, and the positive terminal of each photovoltaic cell string is electrically connected to the anode of the third diode D3 through the second strip conductive structure 602 and the anode of the second diode D2.

[0069] The positive terminal of the first battery string group A serves as the positive output terminal of the photovoltaic cell layer 3, and the negative terminal of the third battery string serves as the negative output terminal of the photovoltaic cell layer 3.

[0070] like Figure 3 As shown, in the first battery string group A, the positive terminals of each photovoltaic cell string are located in the middle of the photovoltaic module, while the negative terminals are located at opposite ends of the photovoltaic module. Based on this, a first diode D1 is disposed between the first battery string group A and the second battery string group B. The first diode D1 is also located in the middle of the photovoltaic module, and its cathode is electrically connected to the positive terminals of each photovoltaic cell string in the first battery string group A. Based on this, the negative terminals of the four photovoltaic cell strings in the first battery string group A are electrically connected to the anode of the first diode D1 through two first strip-shaped conductive structures 601.

[0071] The layout of the four photovoltaic strings in the second battery string group B is the same as that in the first battery string group A. The negative terminals of each photovoltaic string are located at opposite ends of the photovoltaic module and are electrically connected to the anode of the second diode via two second strip-shaped conductive structures 602. The positive terminals of each photovoltaic string are connected to the cathode of the second diode and also to the anode of the first diode D1. This means that the second battery string group B is connected in series with the first battery string group A via the first strip-shaped conductive structures 601, and the negative terminals of each photovoltaic string are located in the middle region of the photovoltaic module. Similar to the first battery string group A, the second strip-shaped conductive structures 602 can ensure normal circuit conduction and output current when the second battery string group B is working normally. However, in the event of a fault in the second battery string group B, they are short-circuited by the second diode D2 to prevent severe hot spot problems in the second battery string group B.

[0072] Based on this, for the third battery string group C, the positive terminals of each photovoltaic cell string are the opposite ends of the photovoltaic module, and are electrically connected to the negative terminals of the photovoltaic cell strings in the second battery string group B. At the same time, the negative terminals of each photovoltaic cell string are electrically connected to the anode of the third diode D3, and the cathode of the third diode D3 is electrically connected to the second strip-shaped conductive structure 602. This allows the third battery string group C to be connected in series with the second battery string group B. In the event of a fault in the photovoltaic cell string in the third battery string group C, the third battery string group C can be short-circuited through the second strip-shaped conductive structure 602 and the third diode D3, thereby preventing the first battery string group A and the second battery string group B from charging the third battery string group C and causing hot spots.

[0073] Understandable Figure 3 This application only shows one circuit structure formed between the cells of the photovoltaic module. In practical applications, the cells of the photovoltaic module in this application may also be connected to form other forms of circuit structures. However, the electrical connection between the electrodes of two photovoltaic cell strings that are far apart can be achieved by the strip-shaped conductive structure 6 in this application.

[0074] Based on any of the above embodiments, the photovoltaic module of this application can be a relatively large module, such as a 210N-69 type multi-cell module. This type of photovoltaic module is developed based on the upper limit of production line and transportation compatibility, maximizing the power generation of the module, and the module length is the upper limit of existing production line compatibility, and the width is the upper limit of the short side of the module for vertical packaging and transportation.

[0075] In one specific embodiment of this application, in the photovoltaic cell string of the photovoltaic module, each cell can be formed by dividing a whole cell into multiple segments, such as dividing a whole cell into two or four segments; the length and width of the whole cell are both 182mm~240mm; each photovoltaic cell string includes 20~25 cells; the spacing between two adjacent and parallel photovoltaic cell strings is 0.2mm~2.0mm;

[0076] The photovoltaic modules have a length of 2400mm to 2600mm and a width of 1200mm to 1400mm.

[0077] Obviously, the length and width of the photovoltaic module in this embodiment are relatively large. Based on this, a strip-shaped conductive structure 6 is set between the back sheet 5 and the back encapsulation film 4, which is equivalent to realizing the circuit connection of the photovoltaic cell layer 3 in two different spatial layers on the upper and lower sides of the back encapsulation film 4, thereby reducing the circuit layout difficulty of the photovoltaic cell layer 3 to a certain extent.

[0078] In summary, this application provides a strip-shaped conductive structure between the photovoltaic cell layer and the backsheet. This structure can be positioned directly opposite the gap between two rows of adjacent and parallel photovoltaic cell strings, extending through the backsheet encapsulation film to the photovoltaic cell layer and achieving electrical connection between the widely spaced terminals of the two photovoltaic cell strings. Clearly, this strip-shaped conductive structure does not require occupying space between adjacent rows of photovoltaic cell strings. Furthermore, in addition to a conductive metal strip, the strip-shaped conductive structure further includes a first encapsulation film strip and a second encapsulation film strip wrapped around the upper and lower surfaces of the metal conductive strip, respectively. During the lamination and extrusion process of the photovoltaic module, the first and second encapsulation film strips possess insulating and flexible deformation properties. This effectively prevents direct contact and short circuits between the metal conductive strip and the cells, while also buffering the mutual compression between the strip-shaped conductive structure and the cells due to the flexible deformation of the first and second encapsulation film strips. This effectively avoids the problem of mutual misalignment between the cells and the strip-shaped conductive structure, thereby ensuring the reliability of the series-parallel connection of the photovoltaic cell strings through the strip-shaped conductive structure, and ultimately ensuring the reliability of the photovoltaic module.

[0079] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that the elements inherent in a process, method, article, or apparatus that includes a list of elements are included. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element. Additionally, portions of the technical solutions provided in the embodiments of this application that are consistent with the implementation principles of corresponding technical solutions in the prior art have not been described in detail to avoid excessive elaboration.

[0080] This article uses specific examples to illustrate the principles and implementation methods of this utility model. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made to this utility model without departing from the principles of this utility model, and these improvements and modifications also fall within the protection scope of the claims of this utility model.

Claims

1. A photovoltaic module, characterized in that, It includes a front glass panel, a front encapsulating film, a photovoltaic cell layer, a back encapsulating film, and a back sheet stacked in sequence; the photovoltaic cell layer includes multiple sets of photovoltaic cell strings arranged in an array, and each set of photovoltaic cell strings includes multiple cells arranged in a straight line and connected in series. The photovoltaic cell layer and the backsheet are provided with at least one set of strip-shaped conductive structures. The two ends of the strip-shaped conductive structures are respectively connected to the non-adjacent electrodes of the adjacent photovoltaic cell strings. The strip-shaped conductive structure includes a metal conductive strip and a first adhesive strip and a second adhesive strip covering the upper and lower surfaces of the metal conductive strip respectively. The upper surface of the metal conductive strip is the surface close to the photovoltaic cell layer.

2. The photovoltaic module as described in claim 1, characterized in that, The thickness of the metal conductive strip is 50um~100um; The thickness of both the first adhesive strip and the second adhesive strip is 100um~150um.

3. The photovoltaic module as described in claim 2, characterized in that, The upper surface of the metal conductive strip is a strip-shaped V-groove surface; wherein the included angle of the strip-shaped V-groove surface is 110°~160°.

4. The photovoltaic module as described in claim 2, characterized in that, A PET structural strip is further provided between the upper surface of the metal conductive strip and the first adhesive film strip; the thickness of the PET structural strip is 150um~250um.

5. The photovoltaic module as described in claim 2, characterized in that, An insulating fluorine coating is also provided between the lower surface of the metal conductive strip and the second adhesive strip; the thickness of the insulating fluorine coating is 10um~20um.

6. The photovoltaic module as described in claim 2, characterized in that, The surface of the metal conductive strip is also coated with a PTFE coating.

7. The photovoltaic module as described in claim 1, characterized in that, Each of the photovoltaic cell strings is formed by dividing a whole cell into multiple segments; the length and width of the whole cell are both 182mm~240mm; each photovoltaic cell string includes 20~25 cells; the spacing between two adjacent and parallel sets of photovoltaic cell strings is 0.1mm~2.0mm; The photovoltaic module has a length of 2400mm to 2600mm and a width of 1200mm to 1400mm.

8. The photovoltaic module as described in claim 1, characterized in that, The strip-shaped conductive structure is disposed between the back sealing film and the backplate; the two ends of the metal conductive strip have bent ends, which are electrically connected through the back sealing film and the end of the photovoltaic cell string.

9. The photovoltaic module according to any one of claims 1 to 8, characterized in that, The photovoltaic cell layer includes multiple sets of cell strings; each set of cell strings is connected to a diode; each set of cell strings includes four sets of photovoltaic cell strings arranged in a 2×2 array and connected in parallel; each set of photovoltaic cell strings has cells arranged sequentially along a second direction; each set of cell strings has at least three sets arranged sequentially in a first direction, and the sets of cell strings are connected in series. In this configuration, the positive and negative terminals of each photovoltaic cell string in the same battery string group are electrically connected to the cathode and anode of the same diode, respectively. In some of the aforementioned battery string groups, the negative electrodes of each photovoltaic cell string in the same battery string group are electrically connected through the strip-shaped conductive structure; In another part of the battery string group, the positive electrodes of each photovoltaic cell string in the same battery string group are electrically connected through the strip-shaped conductive structure.

10. The photovoltaic module as described in claim 9, characterized in that, The battery string group includes a first battery string group, a second battery string group, and a third battery string group arranged sequentially along the first direction; the diode includes a first diode, a second diode, and a third diode; the strip-shaped conductive structure includes a first strip-shaped conductive structure and a second strip-shaped conductive structure. In the first battery string group and the second battery string group, the positive electrodes of two adjacent photovoltaic cell strings in the second direction are arranged close to each other, and the negative electrodes are arranged away from each other. In the first battery string group, the positive terminal of each photovoltaic cell string is electrically connected to the cathode of the first diode, and the negative terminal of each photovoltaic cell string is electrically connected to the anode of the first diode through the first strip-shaped conductive structure. In the second battery string group, the positive terminal of each photovoltaic cell string is electrically connected to the cathode of the second diode and to the anode of the first diode, and the negative terminal of each photovoltaic cell string is electrically connected to the anode of the second diode through the second strip-shaped conductive structure. In the third battery string group, the negative electrodes of two adjacent photovoltaic cell strings in the second direction are arranged close to each other, and the positive electrodes are arranged away from each other; in the third battery string group, the negative electrode of each photovoltaic cell string is electrically connected to the positive electrode of the second diode, and the positive electrode of each photovoltaic cell string is electrically connected to the anode of the third diode through the second strip-shaped conductive structure and to the anode of the second diode. The positive terminal of the first battery string serves as the positive output terminal of the photovoltaic cell layer, and the negative terminal of the third battery string serves as the negative output terminal of the photovoltaic cell layer.

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