Multi-cut photovoltaic modules

Abstract

This application belongs to the field of photovoltaic technology and discloses a multi-cut photovoltaic module, comprising: two cell matrices connected in parallel, each cell matrix including two cell cells connected in series, each cell cell including at least one cell string and a bypass diode connected in parallel, and each cell string including multiple sliced ​​cells connected in series. The multi-cut photovoltaic module of this application can reduce the resistive loss of the module, increase the power of the photovoltaic module, improve safety and reliability, and facilitate a more compact arrangement of cell strings, thereby increasing the screen-to-body ratio of the photovoltaic module.

Description

Technical Field

[0001] This application relates to the field of photovoltaic technology, specifically to a multi-cut photovoltaic module. Background Technology

[0002] Multi-cut photovoltaic (PV) modules are made by cutting a single solar cell into smaller pieces, such as a two-cut cell (where a single cell is cut into two equal pieces). These smaller pieces are then connected in series to form a string, and finally, these strings are connected and encapsulated to form a PV module. Cutting the single cell into smaller pieces reduces the current flowing through the string, thus reducing resistance losses and increasing the module's power output. Therefore, multi-cut PV modules, such as two-cut, three-cut, four-cut, and six-cut modules, are currently a hot trend in the PV industry. However, existing multi-cut PV modules still have limitations in terms of screen-to-body ratio, power output, safety, and reliability. Summary of the Invention

[0003] The purpose of this application is to provide a multi-cut photovoltaic module that reduces the resistive loss of the module and increases the power of the photovoltaic module.

[0004] To solve at least one of the above-mentioned technical problems, this application adopts the following technical solution:

[0005] A multi-slice photovoltaic module according to an embodiment of this application includes: two cell matrices connected in parallel, each cell matrix including two cell cells connected in series, each cell cell including at least one cell string and a bypass diode connected in parallel, and each cell string including multiple sliced ​​cells connected in series.

[0006] In one possible implementation, the sliced ​​battery is divided into N slices, where N is greater than or equal to two and is an integer, and each battery cell consists of N-1 battery strings connected in parallel.

[0007] In one possible implementation, the two battery cells of each battery matrix are arranged side by side in a U-shaped configuration.

[0008] In one possible implementation, each battery cell further includes a positive busbar, a negative busbar, and a bypass busbar. The positive interconnects of each battery string in each battery cell are connected to the positive busbar, and the negative interconnects are connected to the negative busbar. A bypass diode is connected to the bypass busbar. One end of the bypass busbar is connected to the positive busbar, and the other end is connected to the negative busbar. The positive busbar is located at one end of the battery cell, and the negative busbar is located at the other end of the battery cell.

[0009] In one possible implementation, the positive busbar, negative busbar, and bypass busbar are disposed on the back of the corresponding battery string, and a first insulating strip is disposed between the positive busbar and its corresponding battery string, between the negative busbar and its corresponding battery string, and between the bypass busbar and its corresponding battery string; or, the positive busbar and negative busbar are disposed on the outside of the corresponding battery string.

[0010] In one possible implementation, the multi-cell photovoltaic module of this application further includes: a set of positive terminal boxes for connecting to the positive terminals of two cell arrays; a set of negative terminal boxes for connecting to the negative terminals of two cell arrays; each bypass diode is disposed in its corresponding positive terminal box or negative terminal box, the positive terminal box is connected to a positive terminal via a cable, and the negative terminal box is connected to a negative terminal via a cable.

[0011] In one possible implementation, a set of positive terminal boxes includes one positive terminal box, a set of negative terminal boxes includes one negative terminal box, and two battery matrices share one positive terminal box and one negative terminal box. Two bypass diodes are respectively provided in the positive terminal box and the negative terminal box.

[0012] In one possible implementation, a set of positive terminal boxes includes two positive terminal boxes, a set of negative terminal boxes includes two negative terminal boxes, each battery matrix is ​​connected to one positive terminal box and one negative terminal box respectively, and each positive terminal box and each negative terminal box are respectively provided with a bypass diode.

[0013] In one possible implementation, the multi-cell photovoltaic module of this application further includes: a jumper wire, one end of which is connected between two cell cells of one of the cell arrays, and the other end of which is connected between two cell cells of another cell array.

[0014] In one possible implementation, jumpers are positioned on the back of the two battery arrays, with a second insulating strip between the jumpers and their corresponding battery strings.

[0015] The above-mentioned technical solution of this application has at least one of the following beneficial effects:

[0016] The multi-chip photovoltaic module according to this application includes two interconnected cell matrices. Each cell matrix includes two cell units connected in series. Each cell unit includes at least one cell string and a bypass diode connected in parallel. Each cell string includes multiple sliced ​​cells connected in series. With this configuration, each cell unit in the multi-chip photovoltaic module of this application is connected in parallel with a bypass diode. The cell strings use sliced ​​cells (e.g., two-slice, three-slice, four-slice, five-slice, or six-slice cells), which reduces the module's resistance loss, prevents hot spot effects, increases the photovoltaic module's power, and improves safety and reliability. Furthermore, the series connection of two cell units to form a cell matrix, and the parallel connection of two cell matrices to form a photovoltaic module, facilitates a more compact cell string arrangement, increases the screen-to-body ratio of the photovoltaic module, and increases the power generation per unit area of ​​the photovoltaic module.

[0017] In addition, unless otherwise specified in the technical solution of this application, the technical solution can be implemented by conventional means in the field. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the specific embodiments of this application or the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the structure of a multi-cut photovoltaic module according to one embodiment of this application;

[0020] Figure 2 This is a schematic diagram of the structure of a multi-cut photovoltaic module according to one embodiment of this application;

[0021] Figure 3 This is a schematic diagram of the structure of a multi-cut photovoltaic module according to another embodiment of this application;

[0022] Figure 4 This is a schematic diagram of the positive terminal box and the negative terminal box according to one embodiment of this application;

[0023] Figure 5 This is a schematic diagram of the positive terminal box and the negative terminal box according to another embodiment of this application.

[0024] Explanation of the labels in the attached drawings:

[0025] Battery matrix 1000; Battery cell 1100; Battery string 1110; Bypass diode 1120; Positive busbar 1130; Negative busbar 1140; Bypass busbar 1150; First insulating strip 1160;

[0026] Positive terminal box 2000; Positive terminal 2100;

[0027] Negative terminal box 3000; negative terminal 3100;

[0028] Jumper wire 4000; second insulating strip 4100. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only some, not all, of the embodiments of this application, and are used merely to explain this application and are not intended to limit it. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0030] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "front," "rear," "vertical," "horizontal," "inner," "outer," "both ends," "both sides," "bottom," and "top," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the elements referred to must have a specific orientation or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. In addition, the terms "first," "second," "upper-level," "lower-level," "main," and "secondary," etc., are used for descriptive purposes only and can be simply used to more clearly distinguish different components, and should not be construed as indicating or implying relative importance.

[0031] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral molding; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0032] See Figure 1 , Figure 2 , Figure 3The diagram schematically illustrates a multi-cell photovoltaic module according to an embodiment of this application, comprising two cell matrices 1000 connected in parallel. Each cell matrix 1000 includes two cell units 1100 connected in series. Each cell unit 1100 includes at least one cell string 1110 connected in parallel and a bypass diode 1120. Each cell string 1110 includes multiple sliced ​​cells connected in series. The sliced ​​cells can be two-slice, three-slice, four-slice, five-slice, or six-slice, etc. For example, a six-slice cell (i.e., one-sixth of a whole cell) can be used. The current generated by a six-slice cell is one-sixth of that of a whole cell. The cell strings 1110 of each cell unit 1100 are three connected in parallel.

[0033] Therefore, in this multi-slice photovoltaic module, each cell unit 1100 is connected in parallel with a bypass diode 1120. When a cell unit 1100 is shaded or damaged, the diode short-circuits the cell string 1110 of that cell unit 1100, providing a current "bypass path" to protect the photovoltaic module and maintain system power generation. The cell string 1110 uses sliced ​​cells, which can reduce the resistive loss of the module, prevent hot spot effect, improve the power of the photovoltaic module, and enhance safety and reliability. Two cell units 1100 are connected in series to form a cell matrix 1000, and two cell matrices 1000 are then connected in parallel to form a photovoltaic module. This allows for a more compact arrangement of the cell strings 1110, increases the screen ratio of the photovoltaic module, and increases the power generation per unit area of ​​the photovoltaic module.

[0034] In some embodiments, reference Figure 1 As shown, the sliced ​​battery is divided into N slices, where N is greater than or equal to two and is an integer. Each battery cell 1100 has N-1 battery strings 1110 connected in parallel. That is, the multi-slice photovoltaic module of this application adopts an N-slice N-parallel structure, thereby further improving the power and screen ratio of the photovoltaic module. For example, N is six, the sliced ​​battery is divided into six slices, and each battery cell 1100 includes three battery strings 1110 connected in parallel and a bypass diode 1120. Two battery cells 1100 are connected in series to form a battery matrix 1000. One battery matrix 1000 is equivalent to three battery circuits connected in parallel. Two battery matrices 1000 have a total of six battery circuits connected in parallel, that is, the photovoltaic module adopts a six-slice six-parallel structure.

[0035] In some embodiments, reference Figure 1 As shown, each battery matrix 1000 has two battery cells 1100 arranged side by side in a U-shaped configuration. For example, each battery string 1110 is arranged along... Figure 1In the Y-direction arrangement, the two battery cells 1100 of the battery matrix 1000 are arranged side by side along the X-direction. This facilitates better arrangement of the various battery strings 1110 of the battery matrix 1000, resulting in a more compact structure and improved screen-to-body ratio of the photovoltaic modules.

[0036] In some embodiments, reference Figure 1 , Figure 2 , Figure 3 As shown, each battery cell 1100 also includes a positive busbar 1130, a negative busbar 1140, and a bypass busbar 1150. The positive interconnects of each battery string 1110 in each battery cell 1100 are connected to the positive busbar 1130, and their negative interconnects are connected to the negative busbar 1140. A bypass diode 1120 is connected to the bypass busbar 1150. One end of the bypass busbar 1150 is connected to the positive busbar 1130, and the other end is connected to the negative busbar 1140. The individual cell slices of the battery string 1110 are connected in series via the positive and negative interconnects. The positive interconnects connect to the positive grid lines of each cell slice, and the negative interconnects connect to the negative grid lines of each cell slice. The positive busbar 1130 is located at one end of the battery cell 1100, and the negative busbar 1140 is located at the other end of the battery cell 1100. This setting makes operation simpler.

[0037] Optionally, refer to Figure 2 As shown, the positive busbar 1130, negative busbar 1140, and bypass busbar 1150 are disposed on the back of their respective battery strings 1110. First insulating strips 1160 are respectively provided between the positive busbar 1130 and its corresponding battery string 1110, between the negative busbar 1140 and its corresponding battery string 1110, and between the bypass busbar 1150 and its corresponding battery string 1110. This arrangement hides the positive busbar 1130, negative busbar 1140, and bypass busbar 1150 on the back of the battery strings 1110, increasing the screen-to-body ratio of the photovoltaic module and the power generation per unit area. Furthermore, the first insulating strips 1160 not only isolate the busbars from the battery strings 1110 but also facilitate the installation of the busbars.

[0038] Optionally, refer to Figure 3 As shown, the positive busbar 1130 and negative busbar 1140 are disposed on the outside of the corresponding battery string 1110, that is, the positive busbar 1130 and negative busbar 1140 are arranged on the same plane as the battery string 1110, which can reduce the manufacturing process difficulty of photovoltaic modules and increase production efficiency. In addition, the bypass busbar 1150 can be disposed on the back of the corresponding battery string 1110, and a first insulating strip 1160 is respectively disposed between the bypass busbar 1150 and its corresponding battery string 1110.

[0039] In some embodiments, reference Figures 2-4 As shown, the multi-cell photovoltaic module of this application also includes a set of positive terminal boxes 2000 and a set of negative terminal boxes 3000. The set of positive terminal boxes 2000 is used to connect to the positive terminals of two cell arrays 1000, and the set of negative terminal boxes 3000 is used to connect to the negative terminals of the two cell arrays 1000. Each bypass diode 1120 is disposed within its corresponding positive terminal box 2000 or negative terminal box 3000. The positive terminal box 2000 is connected to a positive terminal 2100 via a cable, and the negative terminal box 3000 is connected to a negative terminal 3100 via a cable. This configuration makes operation more convenient and improves efficiency.

[0040] Optionally, refer to Figure 2 , Figure 4 As shown, a set of positive terminal boxes 2000 includes one positive terminal box 2000, and a set of negative terminal boxes 3000 includes one negative terminal box 3000. Two battery matrices 1000 share one positive terminal box 2000 and one negative terminal box 3000. Two bypass diodes 1120 are respectively installed in the positive terminal box 2000 and the negative terminal box 3000. This configuration reduces the number of terminal boxes and improves assembly efficiency.

[0041] Optionally, refer to Figure 3 , Figure 5 As shown, a set of positive terminal boxes 2000 includes two positive terminal boxes 2000, and a set of negative terminal boxes 3000 includes two negative terminal boxes 3000. Each battery matrix 1000 is connected to one positive terminal box 2000 and one negative terminal box 3000 respectively. Each positive terminal box 2000 and each negative terminal box 3000 is provided with a bypass diode 1120. For example, the positive terminal 2100 can be connected to the two corresponding positive terminal boxes 2000 using a two-core cable, and the negative terminal 3100 can be connected to the two corresponding negative terminal boxes 3000 using a two-core cable. Thus, each battery cell 1100 corresponds to a separate terminal box, and each terminal box is equipped with a bypass diode 1120, resulting in higher safety and reliability.

[0042] In some embodiments, reference Figures 1-3As shown, the multi-chip photovoltaic module of this application also includes a jumper 4000. One end of the jumper 4000 is connected to two battery cells 1100 of one of the battery arrays 1000, and the other end of the jumper 4000 is connected to two battery cells 1100 of another battery array 1000. For example, the multi-chip photovoltaic module of this application consists of four battery cells 1100: A, B, C, and D. A and B are connected in series to form a battery array 1000, C and D are connected in series to form another battery array 1000, and the two battery arrays 1000 are connected in parallel. When A is damaged or shaded, the bypass diode 1120 of A short-circuits the battery string 1110 of A, and at the same time, the jumper 4000 short-circuits the battery string 1110 of C, thereby preventing the voltage of B from being inconsistent with that of C and D, which would cause B to overheat, thus improving the safety and reliability of the photovoltaic module.

[0043] Optionally, refer to Figures 2-4 As shown, the jumper 4000 is located on the back of the two battery arrays 1000, and a second insulating strip 4100 is provided between the jumper 4000 and its corresponding battery string 1110. This arrangement hides the jumper 4000 behind the battery string 1110, increasing the screen-to-body ratio of the photovoltaic module and the power generation per unit area. Furthermore, the second insulating strip 4100 not only isolates the jumper 4000 from the battery string 1110 but also facilitates the installation of the jumper 4000.

[0044] For example, refer to Figures 1-5 As shown, the multi-cell photovoltaic system of this application includes four battery units 1100: A, B, C, and D. A and B are arranged side by side along the X direction and connected in series to form a battery matrix 1000, which is arranged in a U-shape. C and D are arranged side by side along the X direction and connected in series to form a battery matrix 1000, which is also arranged in a U-shape. The two battery matrices 1000 are arranged sequentially along the Y direction and connected in parallel. Negative busbars 1140 of A and C are connected to negative terminal box 3000 and located between two battery matrices 1000. Positive busbar 1130 of A is connected to negative busbar 1140 of B and located at the other end of its corresponding battery matrix 1000. Positive busbar 1130 of C is connected to negative busbar 1140 of D and located at the other end of its corresponding battery matrix 1000. Positive busbars 1130 of B and D are connected to positive terminal box 2000 and located between two battery matrices 1000. A, B, C, and D are each connected in parallel with a bypass diode 1120. One end of jumper 4000 is connected between A and B, and the other end of jumper 4000 is connected between C and D.

[0045] Based on the various embodiments of this application described above, in the absence of explicit denial or conflict, the technical features of one embodiment may be advantageously combined with one or more other embodiments.

[0046] The above descriptions are merely some embodiments of this application, used only to illustrate the technical solutions of this application, and not to limit it. It should be understood that those skilled in the art can make improvements or substitutions based on the above descriptions without departing from the inventive concept of this application, and all such improvements and substitutions should fall within the protection scope of this application. In this case, all details can be replaced with equivalent elements, and materials, shapes, and sizes can also be arbitrary.

Claims

1. A multi-cut photovoltaic module, characterized in that, include: Two battery matrices (1000) are connected in parallel. Each battery matrix (1000) includes two battery cells (1100) connected in series. Each battery cell (1100) includes at least one battery string (1110) and a bypass diode (1120) connected in parallel. Each battery string (1110) includes multiple sliced ​​batteries connected in series.

2. The multi-cut photovoltaic module according to claim 1, characterized in that, The sliced ​​battery is divided into N slices, where N is greater than or equal to two and is an integer. The battery strings (1110) of each battery cell (1100) are N-1 connected in parallel.

3. The multi-cut photovoltaic module according to claim 1, characterized in that, Each of the battery matrices (1000) has two battery cells (1100) arranged side by side in a U-shaped configuration.

4. The multi-cut photovoltaic module according to claim 1, characterized in that, Each of the battery cells (1100) further includes a positive busbar (1130), a negative busbar (1140), and a bypass busbar (1150). The positive interconnection bars of each of the battery strings (1110) of each battery cell (1100) are respectively connected to the positive busbar (1130) and their negative interconnection bars are respectively connected to the negative busbar (1140). The bypass diode (1120) is connected to the bypass busbar (1150). One end of the bypass busbar (1150) is connected to the positive busbar (1130), and its other end is connected to the negative busbar (1140). The positive electrode busbar (1130) is located at one end of the battery cell (1100), and the negative electrode busbar (1140) is located at the other end of the battery cell (1100).

5. The multi-cut photovoltaic module according to claim 4, characterized in that, The positive busbar (1130), the negative busbar (1140), and the bypass busbar (1150) are disposed on the back of the corresponding battery string (1110). A first insulating strip (1160) is provided between the positive busbar (1130) and its corresponding battery string (1110), between the negative busbar (1140) and its corresponding battery string (1110), and between the bypass busbar (1150) and its corresponding battery string (1110). Alternatively, the positive busbar (1130) and the negative busbar (1140) are disposed on the outside of the corresponding battery string (1110).

6. The multi-cut photovoltaic module according to claim 1, characterized in that, Also includes: A set of positive terminal boxes (2000) are used for connection to the positive terminals of the two battery matrices (1000); A set of negative terminal boxes (3000) are used to connect to the negative terminals of the two battery matrices (1000); Each of the bypass diodes (1120) is disposed in its corresponding positive terminal box (2000) or negative terminal box (3000). The positive terminal box (2000) is connected to a positive terminal (2100) via a cable, and the negative terminal box (3000) is connected to a negative terminal (3100) via a cable.

7. The multi-cut photovoltaic module according to claim 6, characterized in that, A set of positive terminal boxes (2000) includes one positive terminal box (2000), a set of negative terminal boxes (3000) includes one negative terminal box (3000), two battery matrices (1000) share one positive terminal box (2000) and one negative terminal box (3000), and two bypass diodes (1120) are respectively provided in the positive terminal box (2000) and the negative terminal box (3000).

8. The multi-cut photovoltaic module according to claim 6, characterized in that, A set of positive terminal boxes (2000) includes two positive terminal boxes (2000), and a set of negative terminal boxes (3000) includes two negative terminal boxes (3000). Each battery matrix (1000) is connected to one positive terminal box (2000) and one negative terminal box (3000) respectively. Each positive terminal box (2000) and each negative terminal box (3000) is provided with a bypass diode (1120).

9. The multi-cut photovoltaic module according to claim 1, characterized in that, Also includes: A jumper (4000) is connected at one end to two battery cells (1100) of one of the battery matrices (1000) and at the other end to two battery cells (1100) of the other battery matrix (1000).

10. The multi-cut photovoltaic module according to claim 9, characterized in that, The jumper (4000) is disposed on the back of the two battery matrices (1000), and a second insulating strip (4100) is disposed between the jumper (4000) and its corresponding battery string (1110).

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