Full-screen photovoltaic module and photovoltaic system

Abstract

The application discloses a full-screen photovoltaic module and a photovoltaic system, which comprise a first battery pack string comprising one battery pack, a second battery pack string comprising two battery packs, the first battery pack string and the second battery pack string being arranged side by side along the short side direction of the full-screen photovoltaic module and being located at the lower side area of the long side extension direction of the full-screen photovoltaic module, a third battery pack string comprising two battery packs, a fourth battery pack string comprising one battery pack, the third battery pack string and the fourth battery pack string being arranged side by side along the short side direction of the full-screen photovoltaic module and being located at the upper side area of the long side extension direction of the full-screen photovoltaic module, wherein the battery pack comprises two parallelly connected battery strings, each battery string is formed by a plurality of battery pieces connected in series, and the first battery pack string, the second battery pack string, the third battery pack string and the fourth battery pack string are connected in series. The application solves the problems of low screen ratio of the battery piece of the existing full-screen photovoltaic module, low power and low double-side rate of the photovoltaic module.

Description

Technical Field

[0001] This invention relates to the field of photovoltaics, and in particular to a full-screen photovoltaic module and photovoltaic system. Background Technology

[0002] In existing photovoltaic (PV) modules, the cell strings are typically arranged in parallel, with the cell spacing usually controlled between 0.8 and 2.0 mm. Busbars are concentrated at the edges of the cell strings. On the one hand, the large number of cell spacing and the busbars at the beginning, end, and middle positions directly occupy the effective light-receiving area on the front of the module, significantly reducing the screen-to-body ratio of the PV module cells, and thus limiting further improvements in module power output.

[0003] Currently, most improvements to full-screen photovoltaic modules reduce front-side shading by folding the front busbars to the back of the cells, but the circuit architecture still uses a top-to-bottom parallel connection. This requires a gap of at least 2mm at the parallel connection points of the upper and lower cell strings, and additional shading strips are needed to cover this gap. This not only results in poor surface uniformity of the module but also further reduces the space for cell placement due to the gap, further decreasing the screen-to-body ratio. Furthermore, this structure requires the development of dedicated junction boxes, significantly increasing the development and mold costs. In addition, the large size of the custom junction box, combined with the four rows of busbars folded to the back (top, bottom, and middle), further increases the shading area on the back cells, ultimately significantly affecting the bifaciality of the photovoltaic module. Summary of the Invention

[0004] The purpose of this invention is to solve the problems of low screen-to-body ratio, low power output, and low bifaciality of existing full-screen photovoltaic modules. This invention provides a full-screen photovoltaic module and system that adopts a left-right parallel design, eliminating the gaps and shading strips in the middle of the full-screen photovoltaic module used for vertical parallel connection. While maintaining overall aesthetic consistency, this significantly improves the screen-to-body ratio of the cells and enhances the bifaciality and power output of the full-screen photovoltaic module.

[0005] To address the aforementioned technical problems, embodiments of the present invention disclose a full-screen photovoltaic module, comprising:

[0006] The first battery string includes a battery pack;

[0007] The second battery string includes two battery strings. The first battery string and the second battery string are arranged side by side along the short side of the full-screen photovoltaic module and are located in the lower region of the long side of the full-screen photovoltaic module.

[0008] The third battery string includes two of the aforementioned battery strings;

[0009] The fourth battery string includes one of the aforementioned battery strings. The third and fourth battery strings are arranged side-by-side along the short side of the full-screen photovoltaic module and are located in the upper region along the long side of the full-screen photovoltaic module.

[0010] The battery pack includes two battery strings connected in parallel, each battery string consisting of multiple battery cells connected in series. The first battery string, the second battery string, the third battery string, and the fourth battery string are connected in series.

[0011] By adopting the above technical solution, the full-screen photovoltaic module of this solution abandons the traditional top-to-bottom parallel circuit architecture and instead adopts a left-to-right parallel and top-to-bottom series arrangement. Since the parallel connection nodes between the upper and lower battery strings are eliminated, there is no need to reserve a parallel gap of more than 2mm in the middle of the module, nor is it necessary to add shading strips. This allows for a continuous battery string design in the upper and lower areas of the module, greatly increasing the cell coverage area and thus significantly improving the front-side screen ratio. It also eliminates optical losses caused by gaps and shading, solves the problem of limited module power output, and results in a more aesthetically pleasing appearance.

[0012] Meanwhile, based on the series connection of the four battery strings (i.e., the first, second, third, and fourth battery strings connected in series), only a three-segment rear main busbar is needed to complete the circuit connection. Compared to the four rows of busbars on the back that cause shading in traditional full-screen photovoltaic modules due to the parallel structure, this solution reduces the number of busbar rows on the back. Furthermore, this circuit structure is compatible with conventional split-type junction boxes, eliminating the need for developing large-volume custom boxes. The reduced box size, combined with the reduced number of busbar rows on the back, significantly reduces shading of incident light from the back, thereby effectively improving the bifaciality of the module.

[0013] Furthermore, the asymmetric grouping design, in which the first battery string includes one battery pack, the second battery string includes two battery packs, the third battery string includes two battery packs, and the fourth battery string includes one battery pack, makes the heat distribution of the hot spots of the photovoltaic module more reasonable.

[0014] According to another specific embodiment of the present invention, an embodiment of the present invention discloses a full-screen photovoltaic module, wherein the battery cell is a half-cell formed by laser cutting a whole crystalline silicon solar cell.

[0015] According to another specific embodiment of the present invention, an embodiment of the present invention discloses a full-screen photovoltaic module, wherein the spacing between adjacent cells in the same cell string is -0.4mm to -2.0mm.

[0016] By adopting the above technical solution and setting a negative spacing, there is no visible gap between adjacent cells in the front field of view, which eliminates the occupation of the front light-receiving area by the spacing between cells and further improves the screen ratio and power output of the module. At the same time, the negative spacing structure is compatible with the appearance requirements of full screen and can achieve visual integration without additional shielding strips.

[0017] According to another specific embodiment of the present invention, an embodiment of the present invention discloses a full-screen photovoltaic module, wherein the overlapping area of ​​adjacent cells in the same cell string is filled with a laminated adhesive film.

[0018] By using the above technical solution, the laminated adhesive film is filled in the local overlapping area of ​​the solar cells caused by negative spacing. This can absorb the mechanical stress between the solar cells during the lamination process, prevent the solar cells from developing microcracks or breaking due to hard contact, and improve the mechanical reliability and long-term stability of the module.

[0019] According to another specific embodiment of the present invention, an embodiment of the present invention discloses a full-screen photovoltaic module, wherein the first battery string, the second battery string, the third battery string and the fourth battery string are all connected in parallel with bypass diodes.

[0020] By adopting the above technical solution, the four battery strings are connected in parallel with bypass diodes. When any battery string is blocked or malfunctions, the corresponding diode will conduct to form a bypass channel, which will prevent hot spots from overheating and damaging the components, and improve the safety and reliability of the components.

[0021] According to another specific embodiment of the present invention, an embodiment of the present invention discloses a full-screen photovoltaic module, which further includes a positive terminal box, a negative terminal box, a first intermediate terminal box and a second intermediate terminal box. The positive terminal box is connected to the first battery string and is provided with a first bypass diode connected in parallel with the first battery string. The first intermediate terminal box is connected to the second battery string and is provided with a second bypass diode connected in parallel with the second battery string. The second intermediate terminal box is connected to the third battery string and is provided with a third bypass diode connected in parallel with the third battery string. The negative terminal box is connected to the fourth battery string and is provided with a fourth bypass diode connected in parallel with the fourth battery string.

[0022] The above technical solution uses four separate junction boxes to connect to the four battery strings one by one, so that each bypass diode is independently encapsulated in its corresponding junction box, which facilitates diode heat dissipation and avoids excessive box temperature caused by the concentrated heat of multiple diodes. At the same time, the split structure allows for flexible adjustment of the junction box position to adapt to different installation scenarios, and there is no need to develop an integrated large box, reducing mold and material costs.

[0023] According to another specific embodiment of the present invention, a full-screen photovoltaic module is disclosed. The positive terminal junction box further includes a positive terminal body, a first copper sheet, a first bypass diode, a first cable, and a positive connector. The first copper sheet includes a first terminal and a second terminal. The first bypass diode is disposed on the first copper sheet of the positive terminal junction box and located between the first terminal and the second terminal. The negative terminal junction box includes a negative terminal body, a second copper sheet, a fourth bypass diode, a second cable, and a negative connector. The second copper sheet includes a third terminal and a fourth terminal. The fourth bypass diode is disposed on the second copper sheet of the negative terminal junction box. The first intermediate junction box includes a first box body, a third copper sheet, and a second bypass diode. The third copper sheet includes a fifth and a sixth terminal. The second bypass diode is disposed on the third copper sheet of the first intermediate junction box and is located between the fifth and the sixth terminal. The second intermediate junction box includes a second box body, a fourth copper sheet, and the third bypass diode. The fourth copper sheet includes a seventh and an eighth terminal. The third bypass diode is disposed on the fourth copper sheet of the second intermediate junction box and is located between the seventh and the eighth terminal.

[0024] By adopting the above technical solution, the internal structure of each junction box is clearly defined, ensuring the stability and current carrying capacity of the electrical connection and reducing contact resistance and power loss. The cable-free design of the first and second intermediate junction boxes can reduce the height of the back protrusion and the obstruction area, further improving the double-sided ratio.

[0025] According to another specific embodiment of the present invention, an embodiment of the present invention discloses a full-screen photovoltaic module, which further includes a first busbar and a second busbar. Along the long side direction of the full-screen photovoltaic module, the first busbar is disposed at the bottom of the first battery string and connected to the first terminal of the positive terminal box; along the long side direction of the full-screen photovoltaic module, the second busbar is disposed at the top of the fourth battery string and connected to the third terminal of the negative terminal box.

[0026] According to another specific embodiment of the present invention, a full-screen photovoltaic module is disclosed, further comprising a first jumper and a second jumper. The first jumper is disposed at the gap between two battery strings of the first battery string, and the second jumper is disposed at the gap between two battery strings of the fourth battery string. The first jumper is insulated from the two battery strings of the first battery string by a first insulating strip and is connected to the second terminal of the positive terminal box. The second jumper is insulated from the two battery strings of the fourth battery string by a second insulating strip and is connected to the fourth terminal of the negative terminal box.

[0027] Using the above technical solution, the first jumper and the second jumper are used to connect the ends of two parallel battery strings inside the first battery string and the fourth battery string to the corresponding junction boxes, and the insulation strip achieves electrical isolation from the corresponding battery strings to avoid the risk of short circuit. During normal operation, the jumper has no current (only when the bypass diode is conducting during hot spot), so no additional series resistance and power loss are introduced, ensuring the output power of the component.

[0028] According to another specific embodiment of the present invention, a full-screen photovoltaic module is disclosed, further comprising a third busbar, a fourth busbar, and a fifth busbar. The third busbar is disposed on the back surface of the solar cell and comprises three segments, with adjacent segments respectively connected to the first intermediate junction box and the second intermediate junction box. The fourth busbar is disposed on the short side of the second solar cell string, enabling two solar cells within the second solar cell string to be connected in series. After being folded, the fourth busbar is insulated from the solar cells of the second solar cell string by a third insulating strip. The fifth busbar is disposed on the short side of the third solar cell string, enabling two solar cells within the third solar cell string to be connected in series. After being folded, the fifth busbar is insulated from the solar cells of the third solar cell string by a fourth insulating strip.

[0029] Using the above technical solution, the three-segment design of the third busbar connects the second battery string, the third battery string, the first intermediate junction box, and the second intermediate junction box in series to form a continuous current path; the fourth and fifth busbars respectively realize the series connection of the two battery strings inside the second and third battery strings, and are folded to the backlight side and isolated by the insulating strip, which not only ensures the continuity of the circuit, but also avoids occupying the front space and causing short circuit of the battery cells.

[0030] According to another specific embodiment of the present invention, an embodiment of the present invention discloses a full-screen photovoltaic module, wherein the arrangement positions of the positive terminal junction box and the negative terminal junction box are selected from any of the following:

[0031] The positive terminal box and the negative terminal box are respectively arranged at diagonal positions of the full-screen photovoltaic module;

[0032] The positive terminal box and the negative terminal box are located at one-quarter of the long side of the full-screen photovoltaic module.

[0033] The positive terminal box and the negative terminal box are located at the center of the long side of the full-screen photovoltaic module.

[0034] The above technical solution allows for the multi-position arrangement of positive and negative junction boxes, which can be adapted to the needs of different scenarios.

[0035] The present invention also discloses a photovoltaic system comprising a plurality of full-screen photovoltaic modules as described in any of the above embodiments, wherein the plurality of full-screen photovoltaic modules are connected in series to form a photovoltaic string, and the photovoltaic string is connected to a photovoltaic inverter.

[0036] According to another specific embodiment of the present invention, a photovoltaic system is disclosed, wherein the positive and negative terminal boxes of each full-screen photovoltaic module are respectively arranged at diagonal positions of the full-screen photovoltaic module, and multiple full-screen photovoltaic modules are arranged sequentially along the long side of the full-screen photovoltaic module, and the positive or negative terminal box of the full-screen photovoltaic module is connected to the negative or positive terminal box of the adjacent full-screen photovoltaic module; or, multiple full-screen photovoltaic modules are arranged sequentially along the short side of the full-screen photovoltaic module, and the positive or negative terminal box of the full-screen photovoltaic module is connected to the negative or positive terminal box of the adjacent full-screen photovoltaic module.

[0037] Using the above technical solution, when the positive and negative junction boxes are arranged diagonally, regardless of whether the components are arranged along the long or short side, the distance between the positive and negative junction boxes of adjacent components is relatively short. The sum of the cable lengths inside the positive and negative junction boxes is approximately the width of the full-screen photovoltaic module, which is sufficient to connect adjacent full-screen photovoltaic modules, thereby reducing cable length and lowering costs.

[0038] According to another specific embodiment of the present invention, a photovoltaic system is disclosed, wherein the positive terminal box and the negative terminal box of each full-screen photovoltaic module are arranged at a quarter position of the long side of the full-screen photovoltaic module, and a plurality of full-screen photovoltaic modules are arranged sequentially along the short side of the full-screen photovoltaic module, and the positive terminal box or the negative terminal box of the full-screen photovoltaic module is connected to the negative terminal box or the positive terminal box of the adjacent full-screen photovoltaic module.

[0039] By adopting the above technical solution, when the positive and negative junction boxes are located at one-quarter of the long side of the full-screen photovoltaic module, and the modules are arranged along the short side, the distance between the positive and negative junction boxes of adjacent modules is relatively short. The sum of the cable lengths inside the positive and negative junction boxes is approximately half the length of the full-screen photovoltaic module, which is sufficient to connect adjacent full-screen photovoltaic modules, reducing cable length and lowering costs. Simultaneously, the positive and negative junction boxes avoid the edge areas of the modules, reducing the risk of tools colliding with the boxes during installation and improving construction safety.

[0040] According to another specific embodiment of the present invention, a photovoltaic system is disclosed, wherein the positive terminal box and the negative terminal box of each full-screen photovoltaic module are arranged at the center of the long side of the full-screen photovoltaic module, and a plurality of full-screen photovoltaic modules are arranged sequentially along the short side of the full-screen photovoltaic module, and the positive terminal box or the negative terminal box of the full-screen photovoltaic module is connected to the negative terminal box or the positive terminal box of the adjacent full-screen photovoltaic module.

[0041] By adopting the above technical solution, when the positive and negative junction boxes are located at the center of the long side of the module, the sum of the cable lengths inside the positive and negative junction boxes is approximately half the width of the full-screen photovoltaic module, which is sufficient to connect adjacent full-screen photovoltaic modules, reducing cable length and lowering costs. Simultaneously, the positive and negative junction boxes are located away from the module edges, reducing the impact of environmental erosion (such as rain and dust) on the junction boxes and extending their service life.

[0042] According to another specific embodiment of the present invention, a photovoltaic system is disclosed, wherein adjacent full-screen photovoltaic modules are mirror images of each other, and the positive or negative terminal box of the full-screen photovoltaic module is connected to the negative or positive terminal box of the adjacent full-screen photovoltaic module.

[0043] By adopting the above technical solution, when adjacent components are arranged in a mirror image, the positive terminal box of one component corresponds to the negative terminal box of another component, which minimizes the distance between them. This allows for the use of the shortest cable to complete the series connection, significantly reducing cable costs and line losses. At the same time, the mirror arrangement can align the texture of the components, improving the overall visual consistency of the power station, which is especially suitable for distributed photovoltaic scenarios with high aesthetic requirements.

[0044] To make the above description of the present invention more apparent and understandable, preferred embodiments are described below in conjunction with the accompanying drawings. Attached Figure Description

[0045] Figure 1 A schematic diagram of the stacking of full-screen photovoltaic modules provided in some embodiments is shown;

[0046] Figure 1A It shows Figure 1 The circuit diagram of the full-screen photovoltaic module is shown below;

[0047] Figure 2 This invention provides a schematic diagram of a photovoltaic system with multiple layers.

[0048] Figure 2A It shows Figure 2 The diagram shows a partial structure of the photovoltaic system.

[0049] Figure 3 This invention provides a schematic diagram of another photovoltaic system with multiple layers.

[0050] Figure 3A It shows Figure 3 The diagram shows a partial structure of the photovoltaic system.

[0051] Figure 4 This invention provides a schematic diagram of another photovoltaic system with multiple layers.

[0052] Figure 4A It shows Figure 4 The diagram shows a partial structure of the photovoltaic system.

[0053] Figure 5 This invention provides a schematic diagram of another photovoltaic system with multiple layers.

[0054] Figure 5A It shows Figure 5 The diagram shows a partial structure of the photovoltaic system.

[0055] Figure 6 This invention provides a schematic diagram of another photovoltaic system with multiple layers.

[0056] Figure 6A It shows Figure 6 The diagram shows a partial structure of the photovoltaic system.

[0057] Figure 7 This invention provides a schematic diagram of another photovoltaic system with multiple layers.

[0058] Figure 7A It shows Figure 7 The diagram shows a partial structure of the photovoltaic system.

[0059] Figure 8 A schematic diagram of the stacking of a full-screen photovoltaic module provided by the present invention is shown;

[0060] Figure 8A It shows Figure 8The circuit diagram of the full-screen photovoltaic module is shown below;

[0061] Figure 8B It shows the relationship with Figure 8A The circuit diagram of the full-screen photovoltaic module shown is a mirror image of the full-screen photovoltaic module.

[0062] Figure 9 A schematic diagram of the positive terminal box provided by the present invention is shown;

[0063] Figure 10 A schematic diagram of the negative terminal box provided by the present invention is shown;

[0064] Figure 11 A schematic diagram of the structure of the first intermediate junction box or the second intermediate junction box provided by the present invention is shown.

[0065] In the attached figures, the following labels are used:

[0066] 10 Photovoltaic modules; 11 Solar cells; 12 Busbars; 13 Through holes;

[0067] 100 full-screen photovoltaic modules;

[0068] 110 First battery string; 111 Second battery string; 112 Third battery string; 113 Fourth battery string; 114 Battery pack; 115 Battery string; 116 Battery cell;

[0069] 120 Positive terminal box; 121 First bypass diode; 122 Positive terminal housing; 123 First copper sheet; 124 First cable; 125 Positive connector; 126 First terminal; 127 Second terminal;

[0070] 130 Negative terminal box; 131 Fourth bypass diode; 132 Negative terminal housing; 133 Second copper metal sheet; 134 Second cable; 135 Negative connector; 136 Third terminal; 137 Fourth terminal;

[0071] 140 First intermediate junction box; 141 Second bypass diode; 142 First housing; 143 Third copper sheet; 144 Fifth terminal; 145 Sixth terminal;

[0072] 150 Second intermediate junction box; 151 Third bypass diode; 152 Second housing; 153 Fourth copper sheet; 154 Seventh terminal; 155 Eighth terminal;

[0073] 160 First bus; 161 Second bus; 162 First jumper; 163 Second jumper; 164 Third bus; 165 Fourth bus; 166 Fifth bus; 167 First segment; 168 Second segment; 169 Third segment;

[0074] 170 First insulating strip; 171 Second insulating strip; 172 Third insulating strip; 173 Fourth insulating strip;

[0075] 200 photovoltaic system. Detailed Implementation

[0076] The following specific embodiments illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. Although the description of the present invention is presented in conjunction with preferred embodiments, this does not mean that the features of the invention are limited to these embodiments. On the contrary, the purpose of describing the invention in conjunction with embodiments is to cover other options or modifications that may be derived based on the claims of the present invention. To provide a deep understanding of the invention, many specific details will be included in the following description. The invention may also be implemented without using these details. Furthermore, to avoid confusion or obscuring the focus of the invention, some specific details will be omitted in the description. It should be noted that, unless otherwise specified, the embodiments and features in the embodiments of the present invention can be combined with each other.

[0077] It should be noted that in this specification, similar reference numerals and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0078] In the description of this embodiment, it should be noted that the terms "upper", "lower", "inner", "bottom", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship that the product of the invention is usually placed in during use. They 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, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the present invention.

[0079] The terms “first”, “second”, etc., are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0080] In the description of this embodiment, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set up," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this embodiment based on the specific circumstances.

[0081] To make the objectives, technical solutions, and advantages of the present invention clearer, the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.

[0082] In some possible implementations, refer to Figure 1 and Figure 1A Traditional photovoltaic modules 10 have their front-side cells 11 fully extended to the edge of the frame, visually approaching a full-screen design. However, the internal circuitry employs a symmetrical, parallel-connected architecture. Since the upper and lower sections need to connect in parallel at the center, a gap of at least 2 mm is required in the middle of the module as a parallel node and insulation space. A central shielding strip is typically added to conceal this gap and internal wiring. This means the module is not a truly seamless full-screen design; visible dividing strips remain on the front, disrupting the aesthetic consistency. Furthermore, to accommodate the parallel structure, four rows of main busbars 12 (multiple horizontal conductive elements in the middle and upper / lower areas of the diagram) are needed on the back to collect current and connect across sections. These busbars, folded over to the back of the cells 11, significantly obstruct the incident light from the back, directly reducing the bifaciality of the bifacial module. Furthermore, this structure often requires the use of widened or specially made large-sized junction boxes, which necessitates redesign and mold opening, increasing material and mold costs. At the same time, in order to accommodate internal wiring and box installation, a large through hole 13 needs to be opened on the back glass, which weakens the mechanical strength of the glass and poses a potential reliability risk.

[0083] To address this, this application provides a full-screen photovoltaic module that adopts a left-right parallel design, eliminating the gaps and shading strips in the middle of the full-screen photovoltaic module used for vertical parallel connection. While ensuring overall appearance consistency, it significantly improves the screen ratio of the solar cells and enhances the bifaciality and power output of the full-screen photovoltaic module.

[0084] refer to Figure 2 This application provides a photovoltaic system 200, including multiple full-screen photovoltaic modules 100. The multiple full-screen photovoltaic modules 100 are connected in series to form a photovoltaic string, which is connected to a photovoltaic inverter (not shown in the figure). It should be noted that this application does not limit the number of full-screen photovoltaic modules 100; the number can be selected based on actual needs.

[0085] For example, refer to Figure 2 and Figure 2A Each full-screen photovoltaic module 100 has a positive terminal junction box 120 and a negative terminal junction box 130 arranged diagonally opposite each other. Multiple full-screen photovoltaic modules 100 are arranged sequentially along the long side X of the full-screen photovoltaic module 100. The positive terminal junction box 120 of each full-screen photovoltaic module 100 is connected to the negative terminal junction box 130 of its adjacent full-screen photovoltaic module 100 to achieve series connection of adjacent full-screen photovoltaic modules 100 (see reference). Figure 2AThe diagram shows the connection between the positive terminal box 120 of the first full-screen photovoltaic module 100 (from right to left) and the negative terminal box 130 of the second full-screen photovoltaic module 100. Specifically, the positive connector 125 of the positive terminal box 120 is connected to the negative connector 135 of the negative terminal box 130. Alternatively, the negative terminal box 130 of the full-screen photovoltaic module 100 is connected to the positive terminal box 120 of the adjacent full-screen photovoltaic module 100 to achieve series connection of adjacent full-screen photovoltaic modules 100 (see reference). Figure 2A The diagram shows the connection between the negative terminal box 130 of the second full-screen photovoltaic module 100 and the positive terminal box 120 of the third full-screen photovoltaic module 100 (from left to right). Specifically, the positive connector 125 of the positive terminal box 120 is connected to the negative connector 135 of the negative terminal box 130. This can be achieved by connecting multiple full-screen photovoltaic modules 100 in series. The distance between the positive terminal boxes 120 and negative terminal boxes 130 of adjacent full-screen photovoltaic modules 100 is the total length of the first cable 124 of the positive terminal box 120 and the second cable 134 of the negative terminal box 130. It should be noted that... Figure 2 and Figure 2A It only provided a schematic diagram of the connection.

[0086] For example, refer to Figure 3 and Figure 3A In this configuration, the positive terminal junction box 120 and negative terminal junction box 130 of each full-screen photovoltaic module 100 are arranged diagonally opposite each other. The odd-numbered full-screen photovoltaic modules 100 remain unchanged, while the even-numbered modules are swapped vertically. Then, multiple full-screen photovoltaic modules 100 are arranged sequentially along the short side Y direction of the full-screen photovoltaic module 100. The positive terminal junction boxes 120 and negative terminal junction boxes 130 of adjacent full-screen photovoltaic modules 100 are connected to achieve series connection of adjacent full-screen photovoltaic modules 100. The connection method is as described above and will not be repeated here. It should be noted that... Figure 3 and Figure 3A Only a schematic diagram of the connection was provided.

[0087] For example, refer to Figure 4 and Figure 4A The positive terminal junction box 120 and the negative terminal junction box 130 are located at one-quarter of the long side of the full-screen photovoltaic module 100. Multiple full-screen photovoltaic modules 100 are arranged sequentially along the short side direction Y of the full-screen photovoltaic module 100. The positive terminal junction boxes 120 and negative terminal junction boxes 130 of adjacent full-screen photovoltaic modules 100 are connected to achieve series connection of adjacent full-screen photovoltaic modules 100. The connection method is as described above and will not be repeated here. It should be noted that... Figure 4 and Figure 4A It only provided a schematic diagram of the connection.

[0088] For example, refer to Figure 5 and Figure 5A The positive terminal junction box 120 and the negative terminal junction box 130 are located at the center of the long side of the full-screen photovoltaic module 100. Multiple full-screen photovoltaic modules 100 are arranged sequentially along the short side direction Y of the full-screen photovoltaic module 100. The positive terminal junction boxes 120 and negative terminal junction boxes 130 of adjacent full-screen photovoltaic modules 100 are connected to achieve series connection of adjacent full-screen photovoltaic modules 100. The connection method is as described above and will not be repeated here. It should be noted that... Figure 5 and Figure 5A It only provided a schematic diagram of the connection.

[0089] For example, refer to Figure 6 and Figure 6A Adjacent full-screen photovoltaic modules 100 are mirror images of each other, and the positive terminal junction box 120 and negative terminal junction box 130 of adjacent full-screen photovoltaic modules 100 are connected in series. Specifically, for example, one of the adjacent full-screen photovoltaic modules 100 (e.g., Figure 6A The full-screen photovoltaic module (model A, 100) is as follows: Figure 8A The full-screen photovoltaic module 100 shown, and its adjacent other (e.g.) Figure 6A The full-screen photovoltaic module (model B) is as follows: Figure 8B The diagram shows a full-screen photovoltaic module 100. Multiple full-screen photovoltaic modules 100 are arranged sequentially along the long side X of the full-screen photovoltaic module 100. The positive terminal junction box 120 and negative terminal junction box 130 of adjacent full-screen photovoltaic modules 100 are connected in series. The connection method is as described above and will not be repeated here. It should be noted that... Figure 6 and Figure 6A It only provided a schematic diagram of the connection.

[0090] For example, refer to Figure 7 and Figure 7A Adjacent full-screen photovoltaic modules 100 are mirror images of each other, and the positive terminal junction box 120 and negative terminal junction box 130 of adjacent full-screen photovoltaic modules 100 are connected in series. Specifically, for example, one of the adjacent full-screen photovoltaic modules 100 (e.g., Figure 7A The full-screen photovoltaic module (model A, 100) is as follows: Figure 8A The full-screen photovoltaic module 100 shown, and its adjacent other (e.g.) Figure 7A The full-screen photovoltaic module (model B) is as follows: Figure 8BThe diagram shows a full-screen photovoltaic module 100. Multiple full-screen photovoltaic modules 100 are arranged sequentially along the short side direction Y of the full-screen photovoltaic module 100. The positive terminal junction box 120 and negative terminal junction box 130 of adjacent full-screen photovoltaic modules 100 are connected to achieve series connection of adjacent full-screen photovoltaic modules 100. The connection method is as described above and will not be repeated here. It should be noted that... Figure 7 and Figure 7A It only provided a schematic diagram of the connection.

[0091] refer to Figures 8 to 8B The full-screen photovoltaic module 100 includes a first battery string 110, a second battery string 111, a third battery string 112, and a fourth battery string 113. The first battery string 110 includes one battery string 114; the second battery string 111 includes two battery strings 114, the first battery string 110 and the second battery string 111 are arranged side by side along the short side direction Y of the full-screen photovoltaic module 100 and are located in the lower region along the long side extension direction of the full-screen photovoltaic module 100; the third battery string 112 includes two battery strings 114; the fourth battery string 113 includes one battery string 114, the third battery string 112 and the fourth battery string 113 are arranged side by side along the short side direction Y of the full-screen photovoltaic module 100 and are located in the upper region along the long side extension direction of the full-screen photovoltaic module 100; wherein, the battery string 114 includes two parallel connected battery strings 115, each battery string 115 is composed of multiple battery cells 116 connected in series, and the first battery string 110, the second battery string 111, the third battery string 112 and the fourth battery string 113 are connected in series.

[0092] For example, the solar cell 116 is a half-cell formed by laser cutting a whole crystalline silicon solar cell. The spacing between adjacent solar cells 116 within the same solar cell string 115 is -0.4mm to -2.0mm. For example, the spacing between adjacent solar cells 116 within the same solar cell string 115 is -0.4mm, -0.56mm, -0.94mm, -0.15mm, -0.2mm, etc. The overlapping area of ​​adjacent solar cells 116 within the same solar cell string 115 is filled with a laminated adhesive film (not shown in the figure). The first solar cell string 110, the second solar cell string 111, the third solar cell string 112, and the fourth solar cell string 113 are all connected in parallel with bypass diodes. Specifically, the first battery string 110 is connected in parallel with a first bypass diode 121, the second battery string 111 is connected in parallel with a second bypass diode 141, the third battery string 112 is connected in parallel with a third bypass diode 151, and the fourth battery string 113 is connected in parallel with a fourth bypass diode 131.

[0093] For example, combined Figures 9 to 11The full-screen photovoltaic module 100 also includes a positive terminal junction box 120, a negative terminal junction box 130, a first intermediate junction box 140, and a second intermediate junction box 150. The positive terminal junction box 120 is connected to the first battery string 110 and is provided with a first bypass diode 121 connected in parallel with the first battery string 110. The first intermediate junction box 140 is connected to the second battery string 111 and is provided with a second bypass diode 141 connected in parallel with the second battery string 111. The second intermediate junction box 150 is connected to the third battery string 112 and is provided with a third bypass diode 151 connected in parallel with the third battery string 112. The negative terminal junction box 130 is connected to the fourth battery string 113 and is provided with a fourth bypass diode 131 connected in parallel with the fourth battery string 113.

[0094] For example, the positive terminal box 120 further includes a positive terminal housing 122, a first copper sheet 123, a first bypass diode 121, a first cable 124, and a positive terminal connector 125. The first copper sheet 123 includes a first terminal 126 and a second terminal 127. The first bypass diode 121 is disposed on the first copper sheet 123 of the positive terminal box 120 and located between the first terminal 126 and the second terminal 127. The negative terminal box 130 includes a negative terminal housing 132, a second copper sheet 133, a fourth bypass diode 131, a second cable 134, and a negative terminal connector 135. The second copper sheet 133 includes a third terminal 136 and a fourth terminal 137. The fourth bypass diode 131 is disposed on the second copper sheet 133 of the negative terminal box 130 and located between the third terminal 136 and the fourth terminal 137. The first intermediate junction box 140 includes a first housing 142, a third copper plate 143, and a second bypass diode 141. The third copper plate 143 includes a fifth terminal 144 and a sixth terminal 145. The second bypass diode 141 is disposed on the third copper plate 143 of the first intermediate junction box 140 and located between the fifth terminal 144 and the sixth terminal 145. The second intermediate junction box 150 includes a second housing 152, a fourth copper plate 153, and a third bypass diode 151. The fourth copper plate 153 includes a seventh terminal 154 and an eighth terminal 155. The third bypass diode 151 is disposed on the fourth copper plate 153 of the second intermediate junction box 150 and located between the seventh terminal 154 and the eighth terminal 155. The structural schematic diagrams of the first intermediate junction box 140 and the second intermediate junction box 150 are the same, that is, the structures of the first intermediate junction box 140 and the second intermediate junction box 150 can be referred to. Figure 11 The diagram shown is a structural schematic.

[0095] For example, the full-screen photovoltaic module 100 also includes a first busbar 160 and a second busbar 161. Along the long side direction X of the full-screen photovoltaic module 100, the first busbar 160 is located at the bottom of the first battery string 110 and is connected to the first terminal 126 of the first copper sheet 123 of the positive terminal box 120; along the long side direction X of the full-screen photovoltaic module 100, the second busbar 161 is located at the top of the fourth battery string 113 and is connected to the third terminal 136 of the second copper sheet 133 of the negative terminal box 130.

[0096] For example, the full-screen photovoltaic module 100 also includes a first jumper 162 and a second jumper 163. The first jumper 162 is disposed at the gap between two battery strings 115 of the first battery string 110, and the second jumper 163 is disposed at the gap between two battery strings 115 of the fourth battery string 113. The first jumper 162 is insulated from the two battery strings 115 of the first battery string 110 by a first insulating strip 170, and is connected to the second terminal 127 of the first metal copper sheet 123 of the positive terminal junction box 120. The second jumper 163 is insulated from the two battery strings 115 of the fourth battery string 113 by a second insulating strip 171, and is connected to the fourth terminal 137 of the second metal copper sheet 133 of the negative terminal junction box 130.

[0097] For example, the full-screen photovoltaic module 100 further includes a third busbar 164, a fourth busbar 165, and a fifth busbar 166. The third busbar 164 is disposed on the back surface of the solar cell 116 and includes three segments, with adjacent segments connected to the first intermediate junction box 140 and the second intermediate junction box 150, respectively. Specifically, the third busbar 164 includes a first segment 167, a second segment 168, and a third segment 169 spaced apart along the short side direction Y of the full-screen photovoltaic module 100. One end of the first segment 167 of the third busbar 164 is connected to the third solar cell string 112, and the other end is connected to the seventh terminal 154 of the fourth copper sheet 153 of the second intermediate junction box 150. One end of the second segment 168 of the third busbar 164 is connected to the eighth terminal 155 of the fourth copper sheet 153 of the second intermediate junction box 150, and the other end is connected to the fifth terminal 144 of the third copper sheet 143 of the first intermediate junction box 140. One end of the third segment 169 of the third busbar 164 is connected to the sixth terminal 145 of the third copper sheet 143 of the first intermediate junction box 140, and the other end is connected to the second battery string 111. Exemplarily, the positive terminal junction box 120 is soldered to the backlight surface of the first battery string 110 and connected to it via the first jumper 162 and the first busbar 160. The first intermediate junction box 140 is soldered to the backlight surface of the second battery string 111 and connected to it via the third busbar 164. The second intermediate junction box 150 is soldered to the backlight surface of the third battery string 112 and connected to it via the third busbar 164. The negative terminal junction box 130 is soldered to the backlight surface of the fourth battery string 113 and connected to the first battery string 110 via the second jumper 163 and the second busbar 161.

[0098] For example, a fourth busbar 165 is disposed on the short side of the second battery string 111, for connecting two battery packs 114 in series within the second battery string 111. After being folded, the fourth busbar 165 is insulated from the battery cells 116 of the second battery string 111 by a third insulating strip 172. A fifth busbar 166 is disposed on the short side of the third battery string 112, for connecting two battery packs 114 in series within the third battery string 112. After being folded, the fifth busbar 166 is insulated from the battery cells 116 of the third battery string 112 by a fourth insulating strip 173.

[0099] For example, the arrangement positions of the positive terminal junction box 120 and the negative terminal junction box 130 are selected from any of the following: the positive terminal junction box 120 and the negative terminal junction box 130 are respectively arranged at diagonal positions of the full-screen photovoltaic module 100 (e.g., Figures 2 to 3A as well as Figures 6 to 7AThe structure of one of the full-screen photovoltaic modules 100 is shown); the positive terminal junction box 120 and the negative terminal junction box 130 are arranged at one-quarter position of the long side of the full-screen photovoltaic module 100 (as shown in the figure). Figure 4 and Figure 4A The structure of one of the full-screen photovoltaic modules 100 is shown); the positive terminal junction box 120 and the negative terminal junction box 130 are arranged at the center of the long side of the full-screen photovoltaic module 100 (as shown in the figure). Figure 5 and Figure 5A The structure of one of the full-screen photovoltaic modules 100 is shown.

[0100] While the present invention has been illustrated and described with reference to certain preferred embodiments, those skilled in the art should understand that the above description is a further detailed explanation of the invention in conjunction with specific embodiments, and should not be construed as limiting the specific implementation of the invention to these descriptions. Various changes in form and detail can be made by those skilled in the art, including several simple deductions or substitutions, without departing from the spirit and scope of the invention.

Claims

1. A full-screen photovoltaic module, characterized in that, include: The first battery string includes a battery pack; The second battery string includes two battery strings. The first battery string and the second battery string are arranged side by side along the short side of the full-screen photovoltaic module and are located in the lower region of the long side of the full-screen photovoltaic module. The third battery string includes two of the aforementioned battery strings; The fourth battery string includes one of the aforementioned battery strings. The third and fourth battery strings are arranged side-by-side along the short side of the full-screen photovoltaic module and are located in the upper region along the long side of the full-screen photovoltaic module. The battery pack includes two battery strings connected in parallel, each battery string consisting of multiple battery cells connected in series. The first battery string, the second battery string, the third battery string, and the fourth battery string are connected in series.

2. The full-screen photovoltaic module according to claim 1, characterized in that, The battery cell is a half-cell formed by laser cutting a whole crystalline silicon solar cell.

3. The full-screen photovoltaic module according to claim 2, characterized in that, The spacing between adjacent battery cells within the same battery string is -0.4mm to -2.0mm.

4. The full-screen photovoltaic module according to claim 3, characterized in that, The overlapping areas of adjacent battery cells within the same battery string are filled with a laminated adhesive film.

5. The full-screen photovoltaic module according to claim 1, characterized in that, The first battery string, the second battery string, the third battery string, and the fourth battery string are all connected in parallel with bypass diodes.

6. The full-screen photovoltaic module according to claim 5, characterized in that, It also includes a positive terminal box, a negative terminal box, a first intermediate terminal box, and a second intermediate terminal box. The positive terminal box is connected to the first battery string and is provided with a first bypass diode connected in parallel with the first battery string. The first intermediate terminal box is connected to the second battery string and is provided with a second bypass diode connected in parallel with the second battery string. The second intermediate terminal box is connected to the third battery string and is provided with a third bypass diode connected in parallel with the third battery string. The negative terminal box is connected to the fourth battery string and is provided with a fourth bypass diode connected in parallel with the fourth battery string.

7. The full-screen photovoltaic module according to claim 6, characterized in that, The positive terminal box further includes a positive terminal body, a first copper plate, a first bypass diode, a first cable, and a positive connector. The first copper plate includes a first terminal and a second terminal. The first bypass diode is disposed on the first copper plate of the positive terminal box and located between the first terminal and the second terminal. The negative terminal box includes a negative terminal body, a second copper plate, a fourth bypass diode, a second cable, and a negative connector. The second copper plate includes a third terminal and a fourth terminal. The fourth bypass diode is disposed on the second copper plate of the negative terminal box and located between the third terminal and the fourth terminal. Between four terminals; the first intermediate junction box includes a first box body, a third copper sheet, and a second bypass diode, the third copper sheet including a fifth terminal and a sixth terminal, the second bypass diode being disposed on the third copper sheet of the first intermediate junction box and located between the fifth terminal and the sixth terminal; the second intermediate junction box includes a second box body, a fourth copper sheet, and the third bypass diode, the fourth copper sheet including a seventh terminal and an eighth terminal, the third bypass diode being disposed on the fourth copper sheet of the second intermediate junction box and located between the seventh terminal and the eighth terminal.

8. The full-screen photovoltaic module according to claim 7, characterized in that, It also includes a first busbar and a second busbar. Along the long side of the full-screen photovoltaic module, the first busbar is located at the bottom of the first battery string and is connected to the first terminal of the positive terminal box; along the long side of the full-screen photovoltaic module, the second busbar is located at the top of the fourth battery string and is connected to the third terminal of the negative terminal box.

9. The full-screen photovoltaic module according to claim 7, characterized in that, It also includes a first jumper and a second jumper. The first jumper is disposed at the gap between the two battery strings of the first battery pack, and the second jumper is disposed at the gap between the two battery strings of the fourth battery pack. The first jumper is insulated from the two battery strings of the first battery pack by a first insulating strip and is connected to the second terminal of the positive terminal box. The second jumper is insulated from the two battery strings of the fourth battery pack by a second insulating strip and is connected to the fourth terminal of the negative terminal box.

10. The full-screen photovoltaic module according to claim 6, characterized in that, It also includes a third busbar, a fourth busbar, and a fifth busbar. The third busbar is disposed on the back surface of the battery cell and includes three segments, with adjacent segments connected to the first intermediate junction box and the second intermediate junction box, respectively. The fourth busbar is disposed on the short side of the second battery string, enabling two battery cells within the second battery string to be connected in series. After being folded, the fourth busbar is insulated from the battery cells of the second battery string by a third insulating strip. The fifth busbar is disposed on the short side of the third battery string, enabling two battery cells within the third battery string to be connected in series. After being folded, the fifth busbar is insulated from the battery cells of the third battery string by a fourth insulating strip.

11. The full-screen photovoltaic module according to claim 6, characterized in that, The positions of the positive terminal box and the negative terminal box are selected from any of the following: The positive terminal box and the negative terminal box are respectively arranged at diagonal positions of the full-screen photovoltaic module; The positive terminal box and the negative terminal box are located at one-quarter of the long side of the full-screen photovoltaic module. The positive terminal box and the negative terminal box are located at the center of the long side of the full-screen photovoltaic module.

12. A photovoltaic system, characterized in that, It includes multiple full-screen photovoltaic modules as described in any one of claims 1-11, the multiple full-screen photovoltaic modules are connected in series to form a photovoltaic string, and the photovoltaic string is connected to a photovoltaic inverter.

13. The photovoltaic system according to claim 12, characterized in that, The positive and negative junction boxes of each full-screen photovoltaic module are respectively arranged at diagonal positions of the full-screen photovoltaic module. Multiple full-screen photovoltaic modules are arranged sequentially along the long side of the full-screen photovoltaic module. The positive or negative junction box of the full-screen photovoltaic module is connected to the negative or positive junction box of the adjacent full-screen photovoltaic module; or, multiple full-screen photovoltaic modules are arranged sequentially along the short side of the full-screen photovoltaic module. The positive or negative junction box of the full-screen photovoltaic module is connected to the negative or positive junction box of the adjacent full-screen photovoltaic module.

14. The photovoltaic system according to claim 12, characterized in that, The positive and negative junction boxes of each full-screen photovoltaic module are arranged at one-quarter position of the long side of the full-screen photovoltaic module. Multiple full-screen photovoltaic modules are arranged sequentially along the short side of the full-screen photovoltaic module. The positive or negative junction box of the full-screen photovoltaic module is connected to the negative or positive junction box of the adjacent full-screen photovoltaic module.

15. The photovoltaic system according to claim 12, characterized in that, The positive and negative junction boxes of each full-screen photovoltaic module are arranged at the center of the long side of the full-screen photovoltaic module. Multiple full-screen photovoltaic modules are arranged sequentially along the short side of the full-screen photovoltaic module. The positive or negative junction box of the full-screen photovoltaic module is connected to the negative or positive junction box of the adjacent full-screen photovoltaic module.

16. The photovoltaic system according to claim 12, characterized in that, The adjacent full-screen photovoltaic modules are mirror images of each other, and the positive or negative terminal box of the full-screen photovoltaic module is connected to the negative or positive terminal box of the adjacent full-screen photovoltaic module.

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