A photovoltaic module based on bc battery cells

Abstract

The utility model discloses a photovoltaic module based on BC battery piece, including a plurality of battery string, and each battery string is connected in parallel or is connected in series through bus bar, and the battery string includes a plurality of battery piece along the first direction equidistant arrangement, and each battery piece is connected in series through series welding strip, and among two battery pieces at the both ends of battery string, the anode of one is provided with output welding strip, and the cathode of another is provided with output welding strip, and series welding strip and output welding strip all extend along the first direction. The utility model discloses the bus bar is set at the back of battery piece, can reduce the occupancy of bus bar to photovoltaic module effective light receiving area, thereby increases the effective light receiving area of battery piece, promotes the discovery efficiency of photovoltaic module, and makes photovoltaic module more beautiful, and the insulating strip is used for the insulating setting between bus bar and battery piece, reduces the probability that photovoltaic module takes place short circuit, reduces the failure rate of photovoltaic module.

Description

Technical Field

[0001] This utility model belongs to the field of photovoltaic module technology, and in particular relates to a photovoltaic module based on BC cells. 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 CN221407332U discloses a black back-contact solar cell module without grid lines. Its busbars are set at the ends of the solar cells and are spaced apart from the solar cells. This causes the busbars to be exposed, affecting the aesthetics of the photovoltaic module. At the same time, the busbars occupy the effective light-receiving area of ​​the photovoltaic module, which reduces the light-receiving area occupied by the solar cells and thus affects 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 photovoltaic module based on BC cells, which improves the power generation efficiency of the photovoltaic module.

[0006] To achieve the above objectives, the specific technical solution of the photovoltaic module based on BC solar cells of this utility model is as follows: A photovoltaic module based on BC cells includes multiple cell strings, each cell string being connected in parallel or in series via busbars. Each cell string includes multiple cells arranged at equal intervals along a first direction, each cell being connected in series via series solder strips. In the two cells located at both ends of the cell string, one of the positive terminals is provided with an output solder strip, and the other of the negative terminals is provided with an output solder strip. Both the series solder strip and the output solder strip extend along the first direction. The busbar is disposed on the back of the battery cell and extends perpendicular to the first direction. An insulating strip is disposed on the side of the busbar adjacent to the battery cell. The side of the busbar opposite to the battery cell is fixedly connected to the middle of the output solder strip. Both ends of the output solder strip are fixedly connected to the battery cell.

[0007] Preferably, the front side of each battery string is connected to a panel via an adhesive layer, and the back side of each battery string is connected to a back plate via an adhesive layer.

[0008] Preferably, the output solder strip has an extension portion in the middle, and the width of the extension portion is greater than the width of the output solder strip.

[0009] Preferably, the extension portion has a spike on its side adjacent to the busbar.

[0010] Preferably, the insulating strip includes an insulating layer, and an adhesive layer is provided on the side of the insulating layer adjacent to the battery cell.

[0011] Preferably, the insulating layer is a PET layer, and the adhesive layer and the bonding layer are both EVA layers.

[0012] Preferably, the insulating layer has a groove on the side opposite to the battery cell, and the busbar is fitted inside the groove.

[0013] Preferably, the insulating layer is provided with thermally conductive fibers, which are arranged along the extension direction of the insulating strip.

[0014] Preferably, both ends of the insulating strip extend beyond the coverage area of ​​the panel, and the thermally conductive fibers extend beyond the end faces of both ends of the insulating strip.

[0015] The photovoltaic module based on BC solar cells of this invention has the following advantages: By placing the busbars on the back of the solar cells, the effective light-receiving area of ​​the photovoltaic module can be reduced, thereby increasing the effective light-receiving area of ​​the solar cells, improving the photovoltaic module's light-gathering efficiency, and making the photovoltaic module more aesthetically pleasing; the insulating strip is used for insulation between the busbars and the solar cells, reducing the probability of short circuits in the photovoltaic module and lowering its failure rate; by pressing the busbars with output solder ribbons, the busbars can be positioned, reducing the probability of displacement during photovoltaic module lamination, thereby reducing the probability of short circuits in the photovoltaic module and improving the reliability 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 This is a schematic diagram of the connection structure between the battery string and the busbar of this utility model; Figure 3 for Figure 2 Enlarged view of part A; Figure 4 This is a schematic diagram of the connection structure between the insulating strip and the busbar of this utility model; The markings in the diagram are as follows: 1. Panel; 2. Adhesive layer; 3. Battery string; 4. Backplate; 5. Busbar; 6. Insulating strip; 31. Series solder ribbon; 32. Battery cell; 33. Output solder ribbon; 313. Extension section; 314. Spike section; 601. Adhesive layer; 602. Insulating layer; 603. Groove; 604. Thermal conductive fiber. 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 and 2 As shown, a photovoltaic module based on BC cells includes multiple cell strings 3, which are connected in parallel or in series via busbars 5. The front of each cell string 3 is connected to a panel 1 via an adhesive layer 2, and the back of each cell string 3 is connected to a backplate 4 via an adhesive layer 2. Each cell string 3 includes multiple cells 32 arranged at equal intervals along a first direction. The cells 32 are connected in series via series solder strips 31. In the two cells 32 located at both ends of the cell string 3, one of them has an output solder strip 33 at its positive terminal, and the other has an output solder strip 33 at its negative terminal. Both the series solder strips 31 and the output solder strips 33 extend along the first direction. The busbars 5 are located on the back of the cells 32 and extend perpendicular to the first direction. An insulating strip 6 is provided on the side of the busbar 5 adjacent to the cell 32, and the side of the busbar 5 away from the cell 32 is fixedly connected to the middle of the output solder strip 33. Both ends of the output solder strip 33 are fixedly connected to the cell 32.

[0020] In the aforementioned photovoltaic module, both panel 1 and backsheet 4 are tempered glass sheets, and the adhesive layer 2 is an EVA layer. After lamination, panel 1 and backsheet 4 can be firmly fixed to the cell string 3 through the adhesive layer 2 to form a photovoltaic module. The ends of each cell string 3 are connected to each other through busbars 5 to connect multiple cell strings 3 in series or in parallel to form a cell group, enabling it to generate electricity normally under sunlight. In a single cell string 3, the positive and negative electrodes of two adjacent cells 32 are connected by series solder ribbons 31 to complete the series connection of each cell 32. The two cells 32 located at both ends of the cell string 3 are respectively led out with positive and negative electrodes through output solder ribbons 33, serving as the positive and negative output terminals of the entire cell string 3. Therefore, when connecting cell strings 3 in series or in parallel, it is necessary to connect the output solder ribbons 33 to the busbars 5.

[0021] Compared with existing technologies, this photovoltaic module places the busbar 5 on the back of the cell 32 to shade the busbar 5 and improve the aesthetics of the photovoltaic module. Simultaneously, the stacking of the cell 32 and the busbar 5 reduces the area occupied by the busbar 5 in the effective light-receiving area, thereby increasing the effective light-receiving area of ​​the cell 32 and improving the power generation efficiency of the photovoltaic module. An insulating strip 6 is placed between the cell 32 and the busbar 5, separating the busbar 5 from the cell 32 and the series solder strip 31 connected to it. The series solder strip 31 and output solder strip 33 connected to the back of the cell 32 at the end of the cell string 3 are respectively connected to the positive and negative terminals of the cell 32, thus allowing for... The insulating strip 6 separates the positive and negative terminals of the solar cell 32, as well as the solar cell 32 from the busbar 5, thereby reducing the probability of short circuits in the photovoltaic module and improving the stability and safety of photovoltaic module operation. The output solder ribbon 33 can also fix the busbar 5 and the insulating strip 6 to the back of the solar cell 32. The output solder ribbon 33 is connected to the side of the busbar 5 away from the solar cell 32, which can reduce the obstruction of the welding part of the two and facilitate the inspection of welding quality. At the same time, the output solder ribbon 33 plays a positioning role for the busbar 5 and the insulating strip 6, thereby improving the installation accuracy of the two, further reducing the probability of short circuits in the busbar 5, and further improving the stability and safety of photovoltaic module operation.

[0022] Further improvements include, for example Figure 3 and 4 As shown, an extension portion 313 is provided in the middle of the output solder ribbon 33, and the width of the extension portion 313 is greater than the width of the output solder ribbon 33. A spike portion 314 is provided on the side of the extension portion 313 near the busbar 5. The output solder ribbon 33 is welded and fixed to the busbar 5. The extension portion 313 can increase the contact area between the output solder ribbon 33 and the busbar 6, thereby reducing the resistance at the connection point and reducing the heat generation at the connection point of the output solder ribbon 33 and the busbar 6, improving the stability of photovoltaic module operation, and also reducing energy loss and improving the power generation efficiency of photovoltaic module. The spike portion 314 can pierce the oxide layer on the surface of the busbar 5 and extend into the interior of the busbar 5 by pressing the extension portion 313 and the busbar 5 together, thereby further reducing the resistance at the connection point and further reducing heat generation and energy loss.

[0023] Further improvements include, for example Figure 4As shown, the insulating strip 6 includes an insulating layer 602, and an adhesive layer 601 is provided on the side of the insulating layer 602 adjacent to the solar cell 32. The insulating layer 602 is a PET layer, and both the adhesive layer 601 and the bonding layer 2 are EVA layers. After hot pressing, the adhesive layer 601 can stably connect with the solar cell 32, improving the strength of the connection between the insulating strip 6 and the photovoltaic module, thereby improving the structural strength of the photovoltaic module. Furthermore, the adhesive layer 601 can fill the gap between the insulating strip 6 and the solar cell 32 to effectively remove air bubbles and prevent separation during subsequent use, further improving the structural strength of the photovoltaic module and extending its service life.

[0024] Further improvements include, for example Figure 4 As shown, a groove 603 is formed on the side of the insulating layer 602 facing away from the solar cell 32, and the busbar 5 is fitted into the groove 603. The groove 603 can limit the position of the busbar 5 and make the insulating layer 602 wrap around the side of the busbar 5, thereby improving the insulation effect of the busbar 5; at the same time, it can improve the stability of the connection between the insulating strip 6 and the busbar 5, prevent relative friction between the two, maintain a good insulation effect on the busbar 5, and ultimately improve the stability and safety of the photovoltaic module operation.

[0025] Further improvements include, for example Figure 4 As shown, the insulating layer 602 is provided with thermally conductive fibers 604 inside. The thermally conductive fibers 604 are arranged along the extension direction of the insulating strip 6 and extend beyond the end faces of both ends of the insulating strip 6. Both ends of the insulating strip 6 exceed the coverage area of ​​the panel 1.

[0026] Among them, the thermally conductive fiber 604 is boron nitride fiber, which is a high-insulation and high-thermal-conductivity fiber material. Thus, the thermally conductive fiber 604 can improve the insulation performance of the insulation layer 602 and also improve the thermal conductivity of the insulation layer 602. In this way, the insulation layer 602 can dissipate heat from the solar cell 32 and the busbar 5 to maintain the stability of their electrical performance and improve the reliability of photovoltaic module operation. In addition, in the above configuration, after the insulation strip 6 extends to the outside of the panel 1, it can not only better isolate the contact between the busbar 5 and the solar cell 32, but also contact the external air or the frame of the photovoltaic module. This allows the thermally conductive fiber 604 to exchange heat with the air or the frame, thereby improving the heat dissipation effect on the solar cell 32 and the busbar 5, and further improving the stability of photovoltaic module operation.

[0027] 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 photovoltaic module based on BC cells, comprising multiple cell strings (3), wherein each cell string (3) is connected in parallel or in series via a busbar (5), characterized in that: The battery string (3) includes a plurality of battery cells (32) arranged at equal intervals along a first direction. Each battery cell (32) is connected in series by a series solder strip (31). Among the two battery cells (32) located at both ends of the battery string (3), one of them has an output solder strip (33) on its positive electrode and the other has an output solder strip (33) on its negative electrode. Both the series solder strip (31) and the output solder strip (33) extend along the first direction. The busbar (5) is disposed on the back of the battery cell (32). The busbar (5) extends perpendicularly to the first direction. An insulating strip (6) is disposed on the side of the busbar adjacent to the battery cell (32). The side of the busbar away from the battery cell (32) is fixedly connected to the middle of the output solder strip (33). Both ends of the output solder strip (33) are fixedly connected to the battery cell (32).

2. The photovoltaic module based on BC cells according to claim 1, characterized in that, Each of the battery strings (3) has a panel (1) connected to its front side via an adhesive layer (2), and a back plate (4) connected to its back side via an adhesive layer (2).

3. The photovoltaic module based on BC cells according to claim 1, characterized in that, An extension portion (313) is provided in the middle of the output solder strip (33), and the width of the extension portion (313) is greater than the width of the output solder strip (33).

4. The photovoltaic module based on BC cells according to claim 3, characterized in that, The extension (313) has a spike (314) on the side adjacent to the busbar (5).

5. The photovoltaic module based on BC cells according to claim 2, characterized in that, The insulating strip (6) includes an insulating layer (602), and an adhesive layer (601) is provided on the side of the insulating layer (602) adjacent to the battery cell (32).

6. The photovoltaic module based on BC cells according to claim 5, characterized in that, The insulating layer (602) is a PET layer, and the adhesive layer (601) and the bonding layer (2) are both EVA layers.

7. The photovoltaic module based on BC cells according to claim 5, characterized in that, The insulating layer (602) has a groove (603) on the side opposite to the battery cell (32), and the busbar (5) is fitted inside the groove (603).

8. The photovoltaic module based on BC cells according to claim 5, characterized in that, The insulating layer (602) is provided with thermally conductive fibers (604) inside, and the thermally conductive fibers (604) are arranged along the extension direction of the insulating strip (6).

9. The photovoltaic module based on BC cells according to claim 8, characterized in that, Both ends of the insulating strip (6) extend beyond the coverage area of ​​the panel (1), and the thermally conductive fiber (604) extends beyond the end faces of both ends of the insulating strip (6).

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