Large size silicon wafer photovoltaic module

Abstract

The utility model discloses a large -size silicon wafer photovoltaic module, including along the multiple cell series of extending first direction, each cell series is perpendicularly to first direction interval arrangement, and both ends of each cell series are connected to the bus bar, the bus bar is located at the back of cell series, and the side of bus bar near cell series is provided with insulating film, the utility model discloses the bus bar is located at the back of cell series, can leave more effective light -receiving area for placing the cell piece to can increase the size of cell piece to promote the power generation efficiency of photovoltaic module, and the insulating film can insulate between the cell piece and bus bar, to reduce the probability that photovoltaic module takes place short circuit, promotes the security of photovoltaic module.

Description

Technical Field

[0001] This utility model belongs to the field of photovoltaic module technology, and in particular relates to a large-size silicon wafer photovoltaic module. Background Technology

[0002] Photovoltaic modules are the core and most important part of a solar power generation system, and their core function is to convert solar energy into electrical energy.

[0003] Patent CN218069870U discloses a photovoltaic module including multiple battery strings. The ends of each battery string are connected by a busbar. However, the busbar will occupy the effective light-receiving area of ​​the photovoltaic module, which will reduce the light-receiving area occupied by the battery cells and thus affect the power generation efficiency of the photovoltaic module.

[0004] Therefore, it is necessary to improve the photovoltaic modules in the existing technology. Utility Model Content

[0005] The purpose of this invention is to overcome the defects in the existing technology and provide a large-size silicon wafer photovoltaic module, which improves the power generation efficiency of the photovoltaic module.

[0006] To achieve the above objectives, the specific technical solution for the large-size silicon wafer photovoltaic module of this utility model is as follows: A large-size silicon wafer photovoltaic module, comprising: Multiple battery strings extending along a first direction, each battery string being arranged at equal intervals perpendicular to the first direction, and each battery string having a busbar connected to both ends; The busbar is disposed on the back of the battery string, and an insulating film is disposed on the side of the busbar adjacent to the battery string.

[0007] Preferably, the battery string includes a plurality of battery cells arranged at equal intervals along a first direction, and each battery cell is connected in series by a solder strip. The solder strips located at both ends of the battery string are connected to the side of the bus bar opposite to the battery cell.

[0008] Preferably, along the thickness direction of the battery string, the projection of the busbar onto the insulating film falls within the range of the insulating film.

[0009] Preferably, the insulating film includes an insulating and thermally conductive layer connected to the busbar, and an adhesive layer is provided on the side of the insulating and thermally conductive layer opposite to the busbar.

[0010] Preferably, each of the battery strings has an upper adhesive layer and a panel arranged sequentially on its front side, and a lower adhesive layer and a back plate arranged sequentially on its back side, with the insulating film extending beyond the coverage area of ​​the panel.

[0011] Preferably, the insulating film has multiple openings, and the solder strip passes through the openings and is connected to the busbar.

[0012] Preferably, the insulating and thermally conductive layer is a PET layer with an insulating and thermally conductive sheet disposed inside, and the adhesive layer is an EVA layer.

[0013] Preferably, the side of the busbar adjacent to the insulating and thermally conductive layer is a rough surface.

[0014] Preferably, the back plate has a recessed portion on the side adjacent to the battery string, and the projection of the busbar on the back plate falls within the range of the recessed portion along the thickness direction of the back plate.

[0015] The large-size silicon wafer photovoltaic module of this invention has the following advantages: by setting the busbars on the back of the cell string, more effective light-receiving area can be left for placing the cells, thereby increasing the size of the cells and improving the power generation efficiency of the photovoltaic module; the insulating film can insulate between the cells and the busbars, thereby reducing the probability of short circuits in the photovoltaic module and improving the safety of the photovoltaic module. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of the photovoltaic module of this utility model; Figure 2 for Figure 1 Enlarged view of part A; Figure 3 This is a schematic diagram of the connection structure between the battery string and the busbar of this utility model; Figure 4 for Figure 3 Enlarged view of part B; Figure 5 This is a schematic diagram of the structure of the insulating film of this utility model; The markings in the diagram are as follows: 1. Panel; 2. Upper adhesive layer; 3. Battery string; 4. Lower adhesive layer; 5. Backplate; 301. Battery cell; 302. Solder strip; 303. Insulating film; 304. Busbar; 305. Opening; 501. Recess; 3031. Adhesive layer; 3032. Insulating and thermally conductive layer. Detailed Implementation

[0017] The specific embodiments of this utility model will be further described below with reference to the accompanying drawings and examples. The following examples are only used to more clearly illustrate the technical solution of this utility model and should not be construed as limiting the scope of protection of this utility model.

[0018] The terms "top surface," "bottom surface," and "full surface" are used with reference to the normal operating state of the photovoltaic module and are only for the convenience of describing this utility model and simplifying the description. They do not indicate or imply that the device or component 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 utility model.

[0019] like Figure 1-4 As shown, a large-size silicon wafer photovoltaic module includes multiple battery strings 3 extending along a first direction. Each battery string 3 is arranged at equal intervals perpendicular to the first direction, and both ends of each battery string 3 are connected to a busbar 304. The busbar 304 is disposed on the back of the battery string 3, and an insulating film 303 is disposed on the side of the busbar 304 adjacent to the battery string 3.

[0020] In the aforementioned photovoltaic module, each cell string 3 has an upper adhesive layer 2 and a panel 1 arranged sequentially on its front side, and an upper adhesive layer 2 and a backplate 5 arranged sequentially on its back side. Each cell string 3 includes multiple cells 301 arranged at equal intervals along a first direction. Each cell 301 is connected in series by a solder strip 302. Both the upper adhesive layer 2 and the upper adhesive layer 3 are EVA layers, and the panel 1 and the backplate 5 are tempered glass. Each cell string 3 is connected in parallel by a busbar 304. The components of the photovoltaic module are fixed by lamination, so that the EVA layer bonds and fixes the panel 1 and the backplate 5 to the cell string 3. In the meantime, the insulating film 303 and the busbar 304 can be fixed first to prevent relative sliding between them during the subsequent lamination process of the photovoltaic module, thereby improving the stability of the connection between them and ensuring the insulation effect of the insulating film 303.

[0021] In this photovoltaic module, the insulating film 303 is used to isolate the busbar 304 from the solar cell 301 to prevent short circuits in the photovoltaic module, improve the safety of the photovoltaic module, and reduce the failure rate. After the busbar 304 is placed on the back of the solar cell string 3, more effective light-receiving area can be left, so that a larger solar cell 301 can be set. Without increasing the overall size of the photovoltaic module, the power generation efficiency of the photovoltaic module can be effectively improved by increasing the size of the solar cell 301.

[0022] Further improvements include, for example Figure 3 and 4 As shown, the solder strips 302 located at both ends of the battery string 3 are connected to the side of the busbar 304 away from the battery cell 301. The solder strips 302 are fixedly connected to the busbar 304 by welding. Setting the weld joint on the side of the busbar 304 away from the battery cell 301 exposes the weld joint, facilitating subsequent inspection of the welding quality and thus improving the yield rate of photovoltaic module production.

[0023] Further improvements include, for example Figure 3As shown, along the thickness direction of the battery string 3, the projection of the busbar 304 onto the insulating film 303 falls within the area of ​​the insulating film 303. This photovoltaic module configuration allows the insulating film 303 to completely cover the busbar 304, thereby better isolating the busbar 304 and the battery cell 301, ensuring good insulation between them and reducing the failure rate of the photovoltaic module.

[0024] Further improvements include, for example Figure 5 As shown, the insulating film 303 includes an insulating and thermally conductive layer 3032 connected to the busbar 304, and an adhesive layer 3031 is provided on the side of the insulating and thermally conductive layer 3032 facing away from the busbar 304; the insulating and thermally conductive layer 3032 is a PET layer with an insulating and thermally conductive sheet disposed inside, and the adhesive layer 3031 is an EVA layer.

[0025] The specific insulating and heat-conducting sheet is an alumina sheet. Alumina has excellent insulation properties and good thermal conductivity. When it is mixed into the PET layer, the alumina sheets can contact each other to form a thermally conductive network. This gives the PET layer both good insulation and thermal conductivity, allowing the heat generated on the busbar 304 during the use of the photovoltaic module to be discharged. This also ensures that the busbar 304 and the solar cell 301 can have good heat dissipation when stacked, thereby improving the stability of the photovoltaic module's operation.

[0026] Further improvements include, for example Figure 2 As shown, the insulating film 303 extends beyond the coverage area of ​​the panel 1. After the insulating film 303 extends beyond the coverage area of ​​the panel 1, it can come into contact with the air, thereby realizing heat exchange between the busbar 304 and the air, improving the heat dissipation effect of the busbar 304, and further improving the stability of the photovoltaic module operation.

[0027] Further improvements include, for example Figure 4 As shown, the insulating film 303 has multiple openings 305, through which the solder ribbon 302 passes and connects to the busbar 304. The openings 305 are used to pass the solder ribbon 302, which increases the area of ​​the insulating film 303 while preventing interference between the insulating film 303 and the solder ribbon 302, and facilitates the arrangement of the solder ribbon 302; in addition, it can also form a mutual limiting effect between the solder ribbon 302 and the insulating film 303, which can effectively maintain the positional stability of the solder ribbon 302 and the insulating film 303 during the lamination and fixing of the photovoltaic module, and reduce the probability of displacement between the two.

[0028] Further improvements include, for example Figure 5As shown, the side of the busbar 304 adjacent to the insulating and thermally conductive layer 3032 is roughened. The roughened surface can improve the connection strength between the busbar 304 and the insulating and thermally conductive layer 3032, and also increase the contact area between the two, improve the heat exchange efficiency between them, thereby improving the heat dissipation effect of the busbar 304 and further improving the reliability of photovoltaic module operation.

[0029] Further improvements include, for example Figure 2 As shown, a recess 501 is provided on the side of the backplate 5 adjacent to the cell string 3. Along the thickness direction of the backplate 5, the projection of the busbar 304 on the backplate 5 falls within the range of the recess 501. The recess 501 is provided to accommodate the busbar 304. During the lamination of the photovoltaic module, it can limit the busbar 304 and prevent it from shifting. It can also reduce the pressure exerted by the busbar 304 on the cell 301, reducing the probability of damage to the cell 301.

[0030] It is understood that this utility model has been described through some embodiments, and those skilled in the art will recognize that various changes or equivalent substitutions can be made to these features and embodiments without departing from the spirit and scope of this utility model. Furthermore, under the teachings of this utility model, these features and embodiments can be modified to adapt to specific situations and materials without departing from the spirit and scope of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the protection scope of this utility model.

Claims

1. A large-size silicon wafer photovoltaic module, characterized in that, include: Multiple battery strings (3) extending along a first direction, each battery string (3) is arranged at equal intervals perpendicular to the first direction, and each battery string (3) is connected to a busbar (304) at both ends. The busbar (304) is disposed on the back of the battery string (3), and an insulating film (303) is disposed on the side of the busbar (304) adjacent to the battery string (3).

2. The large-size silicon wafer photovoltaic module according to claim 1, characterized in that, The battery string (3) includes a plurality of battery cells (301) arranged at equal intervals along a first direction. Each battery cell (301) is connected in series by a solder strip (302). The solder strip (302) located at both ends of the battery string (3) is connected to the side of the busbar (304) away from the battery cell (301).

3. The large-size silicon wafer photovoltaic module according to claim 2, characterized in that, Along the thickness direction of the battery string (3), the projection of the busbar (304) on the insulating film (303) falls within the range of the insulating film (303).

4. The large-size silicon wafer photovoltaic module according to claim 3, characterized in that, The insulating film (303) includes an insulating and thermally conductive layer (3032) connected to the busbar (304), and an adhesive layer (3031) is provided on the side of the insulating and thermally conductive layer (3032) facing away from the busbar (304).

5. The large-size silicon wafer photovoltaic module according to claim 4, characterized in that, Each of the battery strings (3) has an upper adhesive layer (2) and a panel (1) arranged sequentially on its front side, and a lower adhesive layer (4) and a back plate (5) arranged sequentially on its back side. The insulating film (303) extends beyond the coverage area of ​​the panel (1).

6. The large-size silicon wafer photovoltaic module according to claim 3, characterized in that, The insulating film (303) has a plurality of openings (305), and the solder strip (302) passes through the openings (305) and is connected to the busbar (304).

7. The large-size silicon wafer photovoltaic module according to claim 4, characterized in that, The insulating and thermally conductive layer (3032) is a PET layer with an insulating and thermally conductive sheet inside, and the adhesive layer (3031) is an EVA layer.

8. The large-size silicon wafer photovoltaic module according to claim 7, characterized in that, The side of the busbar (304) adjacent to the insulating and heat-conducting layer (3032) is rough.

9. The large-size silicon wafer photovoltaic module according to claim 5, characterized in that, The back plate (5) has a recess (501) on the side adjacent to the battery string (3). Along the thickness direction of the back plate (5), the projection of the busbar (304) on the back plate (5) falls within the range of the recess (501).

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